JP2002200924A - Power plant support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the large displacement of a power plant 2 while achieving favorable comfortableness, and sufficiently secure the retraction quantity of the power plant 2 at the time of collision to improve shock absorption performance in a vehicle provided with the power plant 2 of a roll inertia main shaft mount type. SOLUTION: The power plant 2 is supported to front side frames 11 and 12 by mounting members 60 and 61 close to a roll inertia main shaft X. The forward end part and the rear end part of a subsidiary frame 32 are respectively connected to the front side frames 11 and 12 to a car body front side and a car body rear side to the power plant 2, so that the subsidiary frame 32 is bent downward at the time of collision. A torque rod 70 is provided to connect the lower part of the power plant 2 to a suspension cross member 38 in the back of part, and the torque rod 70 is disposed with an inclination to be circumferentially directed to the roll inertia main shaft X.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure for supporting a power plant on a vehicle body.

[0002]

2. Description of the Related Art Conventionally, as a power plant supporting structure of this type, for example, as disclosed in Japanese Patent Application Laid-Open No. 8-332858, a power plant is constructed such that an output shaft of an engine is directed in a vehicle width direction. The vehicle is mounted horizontally in the engine room, and both ends in the vehicle width direction of the power plant are supported by a pair of mounting members located near the roll inertia main shaft, respectively, and the power plant extends in the vehicle longitudinal direction. 2. Description of the Related Art There is known a motor that is connected to a vehicle body by a torque rod.

The power plant side of the torque rod is:
The torque rod is connected to a power plant connecting portion provided immediately below the center of gravity of the power plant, while the vehicle body provided on the rear cross member so that the vehicle body side of the torque rod is at the same height as the power plant connecting portion. It is connected to the connection part on the side. The two mounting members provided in the vicinity of the roll inertia main shaft attenuate the vertical vibration mainly generated by the power plant, while the torque rod restricts the swing of the power plant around the roll inertia main shaft. can do.

By the way, when the engine is idling,
The power plant swings around the roll inertia main axis,
The power plant connection at the bottom of the power plant will be displaced in the circumferential direction with respect to the roll inertia main shaft. On the other hand, in the conventional example, the power plant connecting portion is disposed immediately below the center of gravity of the power plant and the torque rod is directed in the circumferential direction of the roll inertia main shaft. The load to be applied is mainly only a component in the longitudinal direction of the torque rod, thereby preventing the vertical vibration due to the swing of the power plant from being transmitted to the vehicle body via the torque rod,
The ride comfort can be improved.

[0005]

However, the structure of the prior art has a problem that the displacement of the upper part of the power plant becomes large when the vehicle starts moving. That is, when the vehicle starts, for example, a reaction force acting from the driving wheel side generates a moment around the ring gear around the entire power plant, and the power plant is displaced upward as a whole, and the upper part is particularly displaced greatly toward the rear of the vehicle body. try to. At this time, the horizontally arranged torque rod as in the conventional example has a tendency to rotate together with the power plant to promote displacement of the upper part of the power plant toward the rear of the vehicle body. In order to avoid contact between accessories and the like and members on the vehicle body due to large displacement, the gap between them and the elastic modulus of the mount member are increased, and power is Measures must be taken, such as regulating the displacement of the plant.

If the gap between the auxiliary equipment of the power plant and the members on the vehicle body side is widened, there arises a problem that the space efficiency of the engine room is deteriorated.
In addition, when the elastic modulus of the mount member is increased, the vibration generated by the power plant cannot be sufficiently attenuated, causing a problem that the ride comfort of the occupant is deteriorated.

Further, the conventional torque rod has the function of displacing the power plant side of the torque rod downward and pulling the power plant downward when the vehicle body collides from the front, but such a torque rod itself is used. May hinder the retreat of the power plant, thereby impairing the shock absorption due to the rearward movement of the power plant.

The present invention has been made in view of the above points, and an object of the present invention is to improve the arrangement of a torque rod connecting a power plant and a vehicle body to improve the ride comfort of an occupant. It is intended to suppress the large displacement of the power plant while maintaining good conditions, and also to ensure sufficient movement of the power plant to the rear of the vehicle body in the event of a collision, thereby improving the shock absorption. .

[0009]

In order to achieve the above object, according to a first solution of the present invention, when an impact acts on a power plant at the time of a vehicle collision or the like, a torque rod is provided for the power plant. The torque rod was configured to be turned around its rear end so as not to hinder the backward movement.

More specifically, according to the first aspect of the present invention, a power plant having an output shaft of an engine oriented in a vehicle width direction is provided in an engine room provided on a vehicle body front side of a vehicle compartment. It is assumed that the power plant support structure is supported via three members. The front end is connected to a component of the engine room at a position offset by a predetermined amount toward the front of the vehicle body from the power plant, and the rear end is connected to the power plant. A subframe member connected to the engine room component at a position on the vehicle rear side of the power plant, two mount members supporting the power plant with respect to the engine room component, and extending in the vehicle longitudinal direction. The front end is rotatably connected to the power plant connection, while the rear end is rotatably connected to the subframe connection. Before the power unit begins to retreat by bending the sub-frame member downward toward the vehicle body when the sub-frame member is deformed by receiving a shock in the vehicle front-rear direction, and the front end is deformed rearward by the offset and the vehicle body is retreated. The sub-frame connecting portion is configured to be positioned below the vehicle body with respect to the power plant connecting portion.

According to this configuration, first, the power plant is securely supported in the engine room by the two mounting members and the torque rod. Then, when a component of the engine room is deformed by receiving an impact from the front of the vehicle body, for example, at the time of a vehicle collision, the subframe member bends below the vehicle body, and the subframe connecting portion is powered before the power plant starts to retreat. Position the vehicle below the plant connection. As a result, when the power plant subsequently recedes due to a direct impact, the torque rod rotates around the rear end and reverses in the vehicle longitudinal direction with the retreat.

That is, the torque rod for supporting the power plant does not hinder the retreat of the power plant at the time of a vehicle collision or the like, so that the shock absorbing property due to the retreat of the power plant can be sufficiently improved. .

According to a second solution of the present invention, a power plant is supported in an engine room in the vicinity of a roll inertia main shaft, and a torque rod for suppressing swinging has a longitudinal direction in a circumferential direction with respect to the roll inertia main shaft. , And arranged in an inclined state such that the front end is lower than the rear end.

More specifically, according to the second aspect of the present invention, there is provided a power plant having an engine output shaft oriented in a vehicle width direction in an engine room provided on a vehicle body front side of a vehicle compartment. Assume a power plant support structure supported via three members. And a pair of mounting members respectively supporting the vicinity of the roll inertia main shaft at both ends in the vehicle width direction of the power plant with respect to the engine room constituent member are provided so as to extend in the vehicle front-rear direction. A torque rod rotatably connected to the plant connecting portion while a rear end portion is rotatably connected to the vehicle body, and the longitudinal direction of the torque rod is defined as a circumferential direction with respect to the roll inertia main shaft. The torque rod is provided so as to be inclined so that the front end of the torque rod is located below the rear end of the vehicle body.

With this structure, the power plant is supported by damping the vibration of the power plant by the mount member disposed in the vicinity of the roll inertia main shaft of the power plant and restricting the swing in the roll direction by the torque rod. Can be.

Also, for example, at idle, the power plant connecting portion is displaced in the circumferential direction with respect to the roll inertia main shaft due to the swing of the power plant. Therefore, only the longitudinal tensile and compressive loads act on the torque rod. Therefore, the vertical vibration caused by the swing of the power plant is not transmitted to the vehicle body via the torque rod.

On the other hand, for example, when the vehicle starts moving, the power plant tends to revolve largely around the ring gear by receiving the reaction force from the driving wheels. That is, while the power plant is displaced upward as a whole, especially the upper portion thereof tends to be largely displaced rearward of the vehicle body. At this time, the torque rod in the inclined state as described above has the front end portion of the power plant. By being displaced upward together, the vehicle is also displaced forward of the vehicle body. In other words, the torque rod displaces the entire power plant toward the front of the vehicle body, thereby suppressing the above-described displacement of the upper portion of the power plant toward the rear of the vehicle body. In other words, according to the present invention, the large displacement of the upper part of the power plant at the time of starting the vehicle can be suppressed by the inclined arrangement of the torque rod, and accordingly, the elasticity of the mount member is reduced to improve the ride comfort of the occupant. It becomes possible to do.

According to a third aspect of the present invention, in the second aspect of the present invention, the front end and the rear end of the torque rod are aligned on a straight line in the vehicle longitudinal direction passing through the center of gravity of the power plant when viewed from the vehicle vertical direction. It is assumed that they are arranged.

In this configuration, since the front end and the rear end of the torque rod are located on a straight line passing through the center of gravity of the power plant when viewed from the vertical direction of the vehicle body, the reaction force from the torque rod causes the power plant to be moved to the power plant. New generation of vibration in the yawing direction can be prevented.

According to a fourth aspect of the present invention, in any one of the second and third aspects of the present invention, the front end is connected to the engine room component at a position offset by a predetermined distance forward of the vehicle body with respect to the power plant, and A subframe member connected to an engine room component at a position on the rear side of the vehicle body with respect to the power plant, and a rear end of the torque rod is connected to a subframe connected to the subframe member. The part is rotatably connected to the part.
When the sub-frame member is bent downward when the vehicle is deformed by receiving an impact in the vehicle front-rear direction, the sub-frame is connected before the front end is deformed rearward by the offset and the power unit starts to retreat. It is configured such that the portion is positioned below the vehicle body with respect to the power plant connection portion.

Thus, the same effect as the first aspect of the invention can be obtained, and the torque rod connecting the power plant and the subframe does not hinder the retreat of the power plant at the time of a vehicle collision or the like. The shock absorption due to the retreat of the power plant can be sufficiently increased.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the sub-frame member is provided below the engine room. Thus, for example, at the time of a vehicle collision, the sub-frame member provided at the lower part of the engine room is bent toward the lower side of the vehicle body, and the power plant is guided to the lower side of the vehicle compartment via the torque rod. As a result, the power plant can sink under the wall of the engine room on the vehicle interior side, and can retreat farther.

According to a sixth aspect of the present invention, in any one of the fourth and fifth aspects, when a torque rod is mounted near at least one of the power plant connecting portion and the subframe connecting portion, It is assumed that a guide portion for guiding a front end or a rear end of the torque rod to the power plant connecting portion or the subframe connecting portion is provided.

According to this, when the torque rod is attached to the power plant and the vehicle body, the front end or the rear end of the torque rod is connected to at least one of the connecting portion between the power plant and the subframe by the guide portion. Therefore, the torque rod can be easily attached.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a front structure of a vehicle 1 according to an embodiment of the present invention. This vehicle 1 is a so-called front engine front drive vehicle in which a power plant 2 is mounted on the front side and front wheels 3 are driven by the power plant 2. That is, FIG.
As shown in FIG. 1, an engine room 5 is provided in front of a vehicle compartment 4 located substantially at the center of the vehicle 1 and adjacent to the vehicle compartment 4,
The power plant 2 is mounted in the engine room 5. As shown in FIG. 2, this power plant 2
When mounted in the engine room 5 and viewed from the rear to the front of the vehicle body, an engine 6 is disposed on the right side of the vehicle body, and a transmission case 7 containing a transmission and a differential device is disposed on the left side of the vehicle body.

The engine room 5 is located on the front side of a dash panel 10 provided to partition the front side of the vehicle compartment 4, and extends forward from both sides of the dash panel 10 in the left-right direction of the vehicle body. It is sandwiched between frames 11 and 12. This dash panel 10
Is formed so as to extend upward from the front edge of the floor panel 13 of the passenger compartment 4, and the upper end thereof is connected to a cowl 14 at a lower portion of a front window (not shown). Also,
Each of the pair of front side frames 11 and 12 has a substantially rectangular closed cross section, extends upward and downward from the lower end of the dash panel 10, and extends substantially at the center of the dash panel 10 in the vertical direction. The power plant 2 is formed so as to extend forward from the front end of the power plant 2 substantially horizontally after reaching the position corresponding to the power plant 2. further,
A radiator support 15 for supporting a radiator is attached to the front end of each of the pair of front side frames 11 and 12. The upper part of the engine room 5 is covered with a hood 17 while the lower part is open.

The front end of each of the pair of front side frames 11 and 12 is deformed by receiving a compressive load in the longitudinal direction of the vehicle body due to an impact at the time of a collision, thereby absorbing a crash. , 19 are mounted. Further, bumper reinforcements 2 located inside the front bumper 20 are provided at the front ends of the crash boxes 18 and 19 on both left and right sides.
1 are fixed at both ends in the left-right direction of the vehicle body.

Further, fender aprons 25 and 26 are disposed above the pair of front side frames 11 and 12 so as to cover the upper portions of the left and right front wheels 3 on the inner side of the vehicle body. These fender aprons 25 and 26
The lower end is connected to the upper surface of the front side frames 11, 12, and the front side frames 11, 12
12 is formed to extend upward from the upper surface of the dash panel 12, and a rear end portion is connected to a front surface of the dash panel 10. Further, suspension towers 30 and 31 to which upper ends of suspension devices 27 (only the right side of the vehicle body is shown) for supporting the left and right front wheels 3 are formed above the fender aprons 25 and 26, respectively.

Next, the front side frame 11,
FIG. 3 shows a sub-frame 32 located below
This will be described with reference to FIG. 3 shows a front side view of the vehicle body 16, and FIGS. 4 and 5 show a front front view and a plan view of the vehicle body 16, respectively. The sub-frame 32 is made of a steel plate and supports the power plant 2, the suspension arm 33 (only the right side of the vehicle body is shown), and the like, and has a substantially rectangular integrated structure as a whole as shown in FIG. . The sub-frame 32 includes a pair of side member portions 35 and 36 extending in the front-rear direction of the vehicle body, and a front member portion continuous with the front ends of the pair of side member portions 35 and 36 and extending substantially horizontally in the lateral direction of the vehicle body. 37. Further, the sub frame 32 is provided with a suspension cross member portion 38 connected to the rear end side of each of the pair of side member portions 35 and 36 and extending substantially horizontally in the lateral direction of the vehicle body on the rear side.

As shown in FIGS. 3 and 5, the front ends of the side members 35 and 36 of the sub-frame 32 are offset from the power plant 2 by a predetermined amount at a position forward of the power plant 2. , 12 respectively. On the other hand, the rear ends of the side members 35 and 36 of the sub-frame 32 are connected to the pair of front side frames 11 and 12 at a position rearward of the power plant 2.

The mounting of the sub-frame 32 to the front side frames 11 and 12 is described in detail at the left and right corners on the front side of the sub-frame 32 from the upper surface of the corner toward the outside of the vehicle body and forward. The mounting brackets 40, 4
1 is provided. The lower ends of the mounting brackets 40, 41 are welded to the sub-frame 32, while the upper ends are provided with cylindrical portions 42, 43 whose axes extend in the vertical direction. Is fitted with a cylindrical rubber bush (not shown). Further, a pipe member (not shown) is fixed to the rubber bush so as to be coaxial with the cylindrical portions 42 and 43, and bolts 48 penetrating the pipe member in the axial direction.
49 allows the upper end of the pipe member to be fastened to the front side frames 11 and 12.

On the other hand, on the rear side of the sub-frame 32, mounting portions 50, 51 for mounting the sub-frame 32 to the front side frames 11, 12 are provided.
The two suspension cross member portions 38 are provided on both sides in the left-right direction of the vehicle body so as to protrude rearward from the rear end. The mounting brackets 40, 41 on the front side of the sub-frame 32 are also provided on the mounting portions 50, 51.
Cylindrical portions 52 and 53 are provided in the same manner as the upper end of the cylindrical portion. Rubber bushes 54 and 55 are fitted inside the cylindrical portions 52 and 53. Pipe members 56 and 57 are fixed to the rubber bushes 54 and 55.
The upper end portions of the front and rear side frames 11 and 12
To be fastened to the lower surface.

As shown in FIG. 3, the side members 35 and 36 of the sub-frame 32 are respectively formed so as to extend substantially horizontally from the rear end to a substantially central portion in the vehicle longitudinal direction. And a front member welded to the rear member, and the front member extends substantially horizontally from the welded portion and bends so as to be inclined upward and forward from there. It extends to the front end along the inclination direction.

Next, the configuration of the power plant 2 of the vehicle 1 will be described. The engine 6 of the power plant 2 is an in-line four-cylinder gasoline engine in which four cylinders are linearly arranged in the direction in which the crankshaft extends. Also,
The engine 6 is placed laterally with respect to the vehicle body 16 such that the crankshaft faces substantially in the vehicle width direction. Although not shown, the output of the engine 6 is transmitted from the crankshaft to the input shaft of the transmission, and The power is transmitted from the output shaft of the device to a ring gear that transmits the driving force to the left and right drive shafts. A differential gear is disposed between the inner ends of the left and right drive shafts on the vehicle body side and the ring gear, and left and right front wheels 3 are provided at outer ends of the left and right drive shafts on the vehicle body, respectively.
Is arranged. The transmission case 7 housing the transmission and the differential is fastened to the left side of the cylinder block of the engine 6.

The power plant 2 configured as described above
Is a so-called roll inertia main shaft mount in the engine room 5. The roll inertia main shaft extends substantially in the lateral direction of the vehicle body through the center of gravity G of the power plant 2 as indicated by the symbol X in FIGS. For details of the roll inertia spindle mount, the vicinity of the roll inertia spindle X at both ends of the power plant 2 in the left-right direction of the vehicle body is respectively referred to as the front side frame 1.
The elastic vibration of the power plant 2 is mainly attenuated by elastically supporting the power plants 1 and 12 via a pair of mount members 60 and 61.

The mount member 61 of the pair of mount members 60, 61 located on the right side of the vehicle body is the engine 6
Engine side bracket 6 fixed to the chain case
2, a vehicle body side bracket 63 fixed to the upper part of the front side frame 12 on the right side of the vehicle body, and a member interposed between the engine side and the vehicle body side brackets 62, 63 for damping vibration such as rubber. Things. On the other hand, a mount member 60 located on the left side of the vehicle body includes a transmission-side bracket 65 fixed to the upper surface of the transmission case 7 and a vehicle-side bracket 66 fixed to the upper surface of the front side frame 11 on the left side of the vehicle body and the inner side surface of the vehicle body.
And a member interposed between the transmission-side and vehicle-body-side brackets 65 and 66 for damping vibration.

On the other hand, in the lower part of the power plant 2,
A torque rod 70 for restricting swinging around the roll inertia main axis X of the power plant 2 is connected. The front end of the torque rod 70 is connected to the lower portion of the transmission case 7 of the power plant 2, while the rear end is connected to the suspension cross member 38 of the subframe 32.

The connection structure of the torque rod 70 will be described in detail with reference to FIGS. FIG.
FIG. 7 is a perspective view showing a mounting structure of the torque rod 70, and FIGS.
2A and 2B are a perspective view and a front view showing the vicinity of a connection portion of a torque rod 70 in a suspension cross member portion 2 of FIG.

As shown in FIG. 6, the power plant 2
A power plant bracket 75 for connecting the front end of the torque rod 70 is provided below the transmission case 7 at a position behind the roll inertia main axis X. The power plant bracket 75 has two substantially triangular plate members 73,
73, between the two plate-like members 73, 73,
Collar members 74 are provided to separate the two plate members 73 from each other by a predetermined distance in the left-right direction of the vehicle body. The two plate-like members 73, 73 are arranged such that one top is located downward, and the two plate-like members 73, 73 and the collar member 74 are located near the two tops located above in this state. , 74 and the fixing bolt 7
6 and 76 are fastened to a fixing portion 78 provided on the side surface of the transmission case 7 on the engine 6 side.

The power plant bracket 7
In the vicinity of the top located below the two plate-like members 73, 73, connection holes (power plant connection portions) 73a, 73 formed so as to be substantially concentric when viewed from the vehicle left-right direction.
The torque rod 7 is provided by bolts 79 which pass through the two connection holes 73a, 73a and the front end of the torque rod 70 together, as will be described in detail later.
0 is connected to the power plant bracket 75 at the front end. In this state, the front end of the torque rod 70 is disposed on a straight line passing through the center of gravity G of the power plant 2 when viewed from the vehicle up-down direction (see FIG. 5). In other words,
The shape of the fixed portion 78 of the transmission case 7 is determined so that the front end of the torque rod 70 is arranged on a straight line passing through the center of gravity G.

On the other hand, as shown in FIGS. 6 to 8, the suspension cross member 38 of the sub-frame 32 is connected to the rear end of the torque rod 70 and has a substantially U-shaped sub-frame whose front side is open. A bracket 80 is provided. The rear surface portion 80a of the sub-frame bracket 80 is attached to a substantially central portion of the suspension cross member portion 38 of the sub-frame 32 in the vehicle left-right direction. A pair of side surfaces 80b, 80b extending and parallel to each other are formed. The pair of side portions 80b, 80b are provided with connection holes (sub-frame connection portions) 80c, 80c having substantially the same shape as the connection holes 73a, 73a of the power plant bracket 75, respectively. The rear end of the torque rod 70 is connected to the sub-frame bracket 80 by bolts 81 that pass through the connection holes 80c, 80c of the sub-frame bracket 80 and the rear end of the torque rod 70 together.

Further, as shown in FIG. 8, the upper portions of the pair of side portions 80b of the sub-frame bracket 80 are formed with inclined portions which are inclined so as to be farther away from each other toward the upper end portions. Also, as shown in FIG.
The side surface portion 80b is recessed outward from the vehicle body from the lower side of the connection hole 80c to the lower edge portion of the inclined portion,
A shallow concave portion 80d is formed so that the width in the vehicle body front-rear direction becomes wider toward the upper side.

In the state of connection with the sub-frame bracket 80, the rear end of the torque rod 70 is disposed on a straight line passing through the center of gravity G of the power plant 2 when viewed from the vehicle vertical direction (see FIG. 5). ). In other words, the suspension cross member 3 of the sub-frame bracket 80
The position of the vehicle body in the left-right direction with respect to the
0 is determined to be arranged on a straight line passing through the center of gravity G.

Further, the connection holes 80c, 80c of the sub-frame bracket 80 are located above the connection holes 73a, 73a of the power plant bracket 75, and as a result, as shown in FIG. Rod 70
Are oriented in the circumferential direction with respect to the roll inertia main shaft 2 of the power plant 2 and are arranged so as to be inclined such that the front end is located lower than the rear end. In other words, the positions of the connection holes 73a and 80c are determined so that the torque rod 70 can be arranged as described above.

The degree of forward inclination of the torque rod 70 is determined by the fact that the sub-frame 32 is bent downward and the power plant bracket 75 is displaced downward when the vehicle 1 collides, which will be described in detail later. ,
Before the impact is directly applied to the power plant 2, the torque rod 70 is inclined such that the front end of the torque rod 70 is located above the rear end.

Next, the structure of the torque rod 70 will be described in detail. The torque rod 70 has two cylindrical members 82 and 85 having different diameters, and the axis of the two cylindrical members 82 and 85 is set in the left-right direction of the vehicle body. And two plate members 90, 90 which are positioned so as to extend and are separated from each other by a predetermined distance in the longitudinal direction of the vehicle body and are integrally connected. The plate members 90, 90 are provided on the left side and the right side of the torque rod 70, respectively, are spaced apart in the left-right direction of the vehicle body, are substantially parallel to each other, and have relatively small diameter cylindrical members 82 at their front ends. However, a cylindrical member 85 having a relatively large diameter is provided at its rear end portion with plate members 90 and 90, respectively.
Is mounted through. The distance between the axes of the two cylindrical members 82 and 85 is determined by the connection holes 73 a and 73 a of the power plant bracket 75 and the connection holes 80 c and 8 of the subframe bracket 80.
0c is substantially the same as the separation distance between the respective central portions.

A cylindrical rubber bush 86 (cylindrical member 85) is provided inside the two cylindrical members 82 and 85, respectively.
Of the rubber bush 8 is fitted.
A pipe member 87 (only the cylindrical member 85 is shown) having substantially the same shape is fixed to the center of the body 6 so as to penetrate the vehicle body in the left-right direction. The length of the pipe member 87 in the left-right direction of the vehicle body is
b, 80b, are slightly shorter than the distance between the recesses 80d, 80d in the lateral direction of the vehicle body.
The diameter of the connecting holes 80c is substantially the same as that of the connecting holes 80c.

Next, the assembly of the torque rod 70 thus configured will be described. First, when connecting the front end of the torque rod 70 to the power plant bracket 75, the front end of the torque rod 70 is positioned between the two plate-like members 73, 73 of the power plant bracket 75. The axis of the pipe member at the front end 70 and the centers of the connection holes 73a, 73a of the plate members 73, 73 are substantially aligned. The connection holes 73a, 73a
The pipe member is rotatably connected to the two plate members 73 by a connecting bolt 79 and a nut (not shown) that penetrate the pipe member together.

When connecting the rear end of the torque rod 70 to the sub-frame bracket 80, first, the rear end of the torque rod 70 is positioned above the both side surfaces 80b of the sub-frame bracket 80. Then, by moving the rear end of the torque rod 70 downward,
The centers of the connection holes 80c, 80c of the side portions 80b, 80b are substantially aligned with the axis of the pipe member 87.

At this time, since the upper portions of the side portions 80b and 80b of the sub-frame bracket 80 are inclined so as to open to the outside of the vehicle body as described above, the pipe member 87 at the rear end of the torque rod 70 is connected to the connection hole. 80c, the connecting hole 80
Guided to a position corresponding to c, 80c. Further, since the concave portions 80d, 80d of the side surface portions 80b, 80b are formed so as to be wider upward, the pipe member 87 at the rear end of the torque rod 70 is relatively moved in the front-rear direction with respect to the connection holes 80c, 80c. Even if the connection holes 80c, 8
It is guided to the position corresponding to 0c. That is, the inclined portions of the side portions 80b, 80b and the recesses 80d, 80d of the sub-frame bracket 80 serve as guides for guiding the rear end of the torque rod 70 to a position corresponding to the sub-frame connecting portions 80c, 80c. The pipe member 87 is fixed to the sub-frame bracket 80 by a connection bolt 81 and a nut (not shown) that penetrate the connection holes 80c, 80c and the pipe member 87 at the rear end of the torque rod 70 together. It is rotatably connected to the side portions 80b, 80b.

As described above, in the vehicle 1, the vibration of the power plant 2 is attenuated by the pair of mounting members 60 and 61 disposed near the roll inertia main axis X of the power plant 2, and the torque rod 70 The power plant 2 can be supported by regulating the swing of the power plant 2 in the roll direction.

That is, when the engine 6 is idling, the entire power plant 2 swings around the roll inertia main axis X due to torque fluctuation. In this vehicle 1, the torque rod 70 is directed in the circumferential direction with respect to the roll inertia main axis X. Therefore, the vertical vibration accompanying the rocking of the power plant 2 is not transmitted to the vehicle body 16 via the torque rod 70. When the front end and the rear end of the torque rod 70 are viewed from the vehicle vertical direction, the center of gravity G
Is positioned on a straight line passing through the
No new vibration in the yawing direction is generated in the power plant 2 by the reaction force from zero.

When the vehicle 1 starts moving, the upper part of the power plant 2 is going to be largely displaced rearward while the whole power plant 2 is displaced upward, and the front end of the torque rod 70 is moved together with the power plant 2 at this time. It will be displaced upward. Here, as described above, since the torque rod 70 is disposed so as to be inclined downward toward the front end, the front end of the torque rod 70 is also displaced forward along with the upward displacement. Due to such displacement of the front end of the torque rod 70, the entire power plant is displaced forward. In other words, when the vehicle 1 starts moving, the rearward displacement of the upper part of the power plant 2 can be suppressed by the torque rod 70, and accordingly, the elastic modulus of the mount members 60 and 61 is reduced and the ride comfort of the occupant is reduced. Can be improved.

Next, the operation of the torque rod 70 when the vehicle 1 makes a head-on collision will be described with reference to FIG. FIG. 9 corresponds to FIG. 3 schematically showing a state of the front portion of the vehicle body 16 after the collision.

First, a crash box (not shown in the figure) is deformed in the longitudinal direction of the vehicle body due to an impact at the time of a collision. Thereafter, the front side frames 11 and 12 are bent so that the intermediate portions thereof are displaced upward. Accordingly, the side member portions 35 and 36 of the sub-frame 32 are provided.
Starts from the welded part between the front member and the rear member,
The welded portion is bent so as to be displaced downward. Here, since the front side of the sub-frame 32 is inclined upward, the welded portions of the side members 35 and 36 can be reliably displaced downward.

The side members 3 of the front side frames 11, 12 and the sub-frame 32
5 and 36 are bent, so that the connecting portion on the front side of the vehicle body is displaced rearward by an offset with respect to the power plant 2, so that the direct impact due to the collision acts on the power plant 2 earlier than before. The connection holes 80c, 80c of the sub-frame bracket 80 are located below the connection holes 73a, 73a of the power plant bracket 75. This allows power plant 2
When the vehicle retreats due to the direct impact due to the collision described above, the torque rod 70 rotates around the rear end and reverses in the vehicle longitudinal direction. That is, the torque rod 7
0 no longer hinders the retreat of powerplant 2,
The shock absorption due to the retreat of the power plant 2 can be sufficiently increased. In addition, at this time, the power plant 2 is guided downward through the torque rod 70, so that the power plant 2 enters below the dash panel 10.
The retreat amount of the power plant 2 can be further increased.

(Other Embodiments) The present invention is not limited to the above-described embodiments, but includes other various embodiments. That is, in the embodiment,
Although the power plant bracket 75 is provided on the transmission case 7, the invention is not limited to this. For example, the power plant bracket 75 may be provided on a cylinder block or the like of the engine 6.

In the above embodiment, the sub-frame 3
The subframe 32 is bent starting from a welded portion between the front member and the rear member of the subframe 2. However, the starting point of the bending is not limited to the bent portion of the subframe 32 described above. Or, it may be a fragile portion such as a notch.

In the above-described embodiment, the guide portions for guiding the rear end of the torque rod 70 to the positions corresponding to the connection holes 80c, 80c are provided on the side surfaces 80b, 80b of the sub-frame bracket 80. The front end of the torque rod 70 is connected to the power plant bracket 75 with the connecting hole 73.
A guide portion for guiding to a position corresponding to a, 73a may be provided.

[0061]

As described above, according to the power plant supporting structure according to the first aspect of the present invention, for example, at the time of a vehicle collision or the like, the torque rod is turned around its rear end to thereby reduce the power plant. Since the backward movement is not hindered, it is possible to sufficiently enhance the absorbability of the impact caused by the backward movement of the power plant.

According to the power plant supporting structure according to the second aspect of the present invention, when the power plant is mounted on the roll inertia main shaft, the torque rod is arranged so as to face in the circumferential direction with respect to the roll inertia main shaft, and when the power plant is idling. The transmission of vertical vibrations from the power plant can be suppressed, and the occupant's riding comfort can be improved. Further, by disposing the torque rod in an inclined manner, for example, when the vehicle starts moving, the displacement of the upper part of the power plant toward the rear of the vehicle body can be suppressed, and the ride comfort of the occupant can be further improved.

According to the third aspect of the present invention, the torque rod is positioned on a straight line passing through the center of gravity of the power plant when viewed from above and below the vehicle body, thereby preventing new vibration in the yawing direction from occurring in the power plant. it can.

According to the fourth aspect of the invention, similarly to the first aspect of the invention, the torque rod can be turned over at the time of a vehicle collision, so that the shock absorption can be sufficiently enhanced.

According to the fifth aspect of the present invention, since the sub-frame member is provided at the lower part of the engine room, at the time of collision, the power plant is guided below the cabin and sneaks under the wall of the engine room on the cabin side. And can be made to retreat more greatly.

According to the sixth aspect of the present invention, the mounting of the torque rod is facilitated by the guide provided near the connecting portion.

[Brief description of the drawings]

FIG. 1 is a side view showing a front structure of a vehicle body according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a front structure of a vehicle body.

FIG. 3 is a side view showing a front structure of the vehicle body in a state in which a front side frame and the like on the right side of the vehicle body are omitted.

FIG. 4 is a front view showing a front structure of the vehicle body.

FIG. 5 is a plan view showing a front structure of the vehicle body.

FIG. 6 is a perspective view showing a mounting structure of a torque rod.

FIG. 7 is a perspective view showing a structure of a sub-frame bracket.

FIG. 8 is a front view showing the structure of the sub-frame bracket.

FIG. 9 is a diagram corresponding to FIG. 3, showing a state of a front portion of the vehicle body after the collision.

[Explanation of symbols]

 2 Power Plant 4 Cab 5 Engine Room 6 Engine 11, 12 Front Side Frame 16 Body 32 Sub Frame 60, 61 Mounting Member 70 Torque Rod 73a Connection Hole (Power Plant Connection) 80c Connection Hole (Sub Frame Connection) 80d Recess (Guiding part) X Roll inertia spindle G Center of gravity

Claims (6)

[Claims] 1. A power plant which supports, via three members, a power plant arranged such that an output shaft of an engine is directed in a vehicle width direction in an engine room provided on a vehicle body front side of a vehicle compartment. In the support structure, a front end portion is connected to a component of an engine room at a position offset by a predetermined amount forward of the power plant from the power plant, and a rear end portion is connected to a component of the engine room at a position rearward of the power plant with respect to the vehicle body. A sub-frame member connected to the power plant; and two mount members supporting the power plant with respect to the components of the engine room. The sub-frame member is disposed so as to extend in the front-rear direction of the vehicle body. A torque rod rotatably connected to the sub-frame connecting portion while being movably connected to the sub-frame connecting portion; Is bent toward the lower side of the vehicle body when deformed by receiving an impact in the front-rear direction of the vehicle body, and before the power unit starts to retreat due to the front end deforming rearward of the vehicle body by the offset, the sub-frame connecting portion is connected to the power unit. A power plant support structure, wherein the power plant support structure is configured to be located below a vehicle body than a plant connection portion. 2. A power plant that supports, via three members, a power plant disposed in an engine room provided on the vehicle body front side of a vehicle compartment so that an output shaft of the engine is directed in a vehicle width direction. In the support structure, a pair of mount members for supporting the vicinity of the roll inertia main shaft at both end portions in the vehicle width direction of the power plant with respect to the engine room constituent member, respectively, and disposed so as to extend in the vehicle longitudinal direction; A torque rod rotatably connected to the power plant connection portion, and a rear end portion rotatably connected to the vehicle body, wherein the torque rod has a longitudinal direction circumferentially around the roll inertia main shaft. The power rod is provided so as to be inclined so that the front end of the torque rod is located below the rear end of the vehicle body than the rear end. Runt support structure. 3. The vehicle according to claim 2, wherein the front end and the rear end of the torque rod are arranged on a straight line in the vehicle longitudinal direction passing through the center of gravity of the power plant when viewed from the vehicle vertical direction. Power plant support structure. 4. The power plant according to claim 2, wherein the front end is connected to the engine room constituent member at a position offset by a predetermined amount toward the front side of the vehicle body with respect to the power plant, and the rear end is higher than the power plant. A subframe member connected to the engine room component member is provided at a position on the rear side of the vehicle body, and a rear end portion of the torque rod is rotatably connected to a subframe connection portion provided on the subframe member. The sub-frame member bends downward when deformed by receiving an impact in the front-rear direction of the vehicle body, and before the power unit starts to retreat after the front end deforms rearward of the vehicle body by the offset, the sub-frame connecting portion is closed. A power plant support structure, which is configured to be positioned below the vehicle body with respect to the power plant connection portion. 5. The power plant support structure according to claim 4, wherein the sub-frame member is provided at a lower portion of the engine room. 6. The torque rod according to claim 4, wherein a torque rod is attached to at least one of the power plant connection portion and the subframe connection portion when the torque rod is attached. A power plant supporting structure, wherein a guide portion for guiding a rear end portion to the power plant connecting portion or the subframe connecting portion is provided.