JPH0126891B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a support device for a power plant in an automobile, and particularly to a support device suitable for a power plant with a horizontally mounted engine.

(Prior Art) Generally, in a front engine/front drive type (F/F type) automobile or a rear engine/rear drive type (R/R type) automobile, the engine and transmission are placed horizontally. It is equipped with a horizontally mounted engine power plant consisting of a differential gear, etc. In addition, such a power plant with a horizontally mounted engine is more likely to generate large rotational vibrations (rolling) in the longitudinal direction due to torque fluctuations, drive reaction force, road reaction force, etc. than those with a vertically mounted engine. Usually the top of the power plant,
A torque rod (roll stopper) has been interposed between the vehicle interior wall of the vehicle body that partitions the engine room and the vehicle interior, but one end of the torque rod is connected orthogonally to the vehicle interior wall. Therefore, there was a problem that the torque rod was weak in strength and that vibration or noise was directly transmitted to the passenger compartment through the torque rod.

Therefore, conventionally, the horizontal engine type power plant is supported at three support points: a lower support member that bears most of the weight of the power plant, and both side support members facing each other on the side wall of the engine room. By locating the center of gravity of the power plant within the area formed by connecting the three support points mentioned above, the torque block described above is not required.
A device that firmly supports the power plant by suppressing rotational vibration (rolling) in the longitudinal direction of the power plant (see Utility Model Application Publication No. 54-5233)
is proposed.

(Problem to be Solved by the Invention) By the way, in a power plant where large torque fluctuations occur, in addition to rotational vibration in the front-rear direction (rolling) of the power plant, there is a problem in which the power plant rotates in the left-right direction (yawing). There is. This is particularly noticeable in 3-cylinder or 5-cylinder engines. However, the above proposal has a drawback in that it cannot adequately cope with the yawing of the power plant.

In view of these points, the present invention has been made to further improve the above-mentioned proposal, and it not only suppresses rolling of the power plant without requiring torque locking, but also effectively suppresses yawing. It is an object of the present invention to provide a support device for a power plant in an automobile that can firmly and reliably support the power plant.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, the three supporting means are positioned so that the center of gravity of the power plant is near the plane containing each supporting means, so that the torque rod is not required. The premise is to suppress rolling of the power plant without causing any damage. In addition, the yawing of the power plant is caused by engine vibration, so to suppress this yawing, the rigidity of the engine mount is reduced. Furthermore, in order to firmly and reliably support the power plant against the power plant's lateral, longitudinal, and vertical accelerations, such load fluctuations can be countered by increasing the rigidity of the engine mount. There is a particular thing.

Specifically, the solution taken by the present invention is a power plant disposed in an engine compartment surrounded by an interior wall of a vehicle body and two side walls extending in the longitudinal direction of the vehicle body from both sides of the interior wall. three support means for elastically supporting the vehicle body at different positions;
A support device for a power plant in an automobile, in which two support means are positioned such that the center of gravity of the power plant is near a plane containing each support means,
Each of the above supporting means includes an inner cylinder connected to either the power plant or the car body, an outer cylinder connected to the other side of the power plant or the car body and arranged coaxially with the inner cylinder, and the inner cylinder and the outer cylinder. Two of the above-mentioned support means are respectively mounted on two different side walls so that the axis of the inner cylinder is in the longitudinal direction of the vehicle body. The other supporting means is attached to a member extending in the width direction of the vehicle body in the engine room so that the axis of the inner cylinder is in the width direction of the vehicle body, and the axis of the inner cylinder of each support means is attached to a member extending in the width direction of the vehicle body. The structure is such that it substantially coincides with the tangential direction of a circle centered on the axis.

(Function) With the above configuration, in the present invention, the power plant is elastically supported by the three supporting means at different positions on both side walls of the vehicle body that constitute the engine room and members extending in the width direction of the vehicle body, and the center of gravity of the power plant is By locating it near the plane containing each of the above-mentioned support means, rolling of the power plant can be effectively suppressed without requiring a torque block or the like.

Further, each support means is composed of an inner cylinder, an outer cylinder, and an elastic member disposed between the inner and outer cylinders, and the axis of the inner cylinder of each support means is in the tangential direction of a circle centered on the yawing axis of the power plant. By substantially matching the yaw, the yawing of the power plant is received by the shearing of the elastic members of each support means, and the mount rigidity can be lowered against yawing caused by engine vibration, so large torque fluctuations can be avoided. Even in the resulting power plant, the yawing of the power plant can be effectively absorbed and alleviated.

Moreover, the axis of the inner cylinder of each support means is arranged so as to substantially coincide with the tangential direction of the circle centered on the yawing axis of the power plant as described above, and the two support means are each attached to the two side walls. The axis of the inner cylinder is arranged in the longitudinal direction of the car body, and the other support means is attached to a member extending in the width direction of the car body in the engine room so that the axis of the inner cylinder is in the width direction of the car body. For the lateral acceleration, longitudinal acceleration, and vertical acceleration of the power plant, the acceleration is absorbed by tensioning and compression of the elastic member in at least one of the three supporting means mentioned above. Mount rigidity against fluctuations can be increased, so
The power plant can be firmly and reliably supported even against such load fluctuations.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 to 3 show an embodiment in which the present invention is applied to a front engine/front drive type (FF type) automobile. In FIGS. 1 to 3, 1 is a vehicle body, and 2 is an engine room provided in front of the vehicle body 1. It is surrounded by left and right side walls 4, 5 extending toward the front of the vehicle body, and a horizontal member 6 extending in the vehicle width direction connecting the front ends of the both side walls 4, 5. The vehicle interior wall 3 is composed of a darts panel 7, a floor 8 connected rearward from the lower end of the darts panel 7, and an angled reinforcing member 9 for reinforcing the connected portion between the darts panel 7 and the floor 8. has been done. Further, the side walls 4 and 5 respectively include a suspension tower 10 and a wheel apron 11 that are integrally formed.
The wheel apron 11 has a side member 12 on its inner surface that extends in the front-rear direction and forms a closed cross section with the wheel apron 11. Said side member 12
forms a closed cross-section that branches vertically with the wheel apron 11 at the front, and is connected to a reinforcing member on the lower surface of the floor at the rear. Further, the horizontal member 6 is constituted by a front member 13 forming a closed section below the front end of the vehicle body 1.
Both ends are connected to the front end of the side member 12.

Reference numeral 14 denotes a horizontal engine type power plant disposed in the engine room 2. The power plant 14 includes an engine 17 equipped with an air cleaner 15, an exhaust manifold 16, etc., and a transmission 18 fixed to the side thereof. , a differential gear 19, an alternator 20, a cooler compressor (not shown), etc., and the engine 17 is disposed horizontally on the right side of the engine room 2. That is, the engine 17 is an in-line multi-cylinder engine in which cylinders are arranged in the width direction of the vehicle body, and the axis of each cylinder is arranged in the vertical direction. In addition, 21 is an axle shaft connected to the differential gear 19 and extends in the vehicle width direction, 22 is a left and right front wheel attached to both ends of the axle shaft 21, 23 is a bonnet that covers the upper surface of the engine room 2, and 24
25 is a front fender, 25 is a suspension member, and 26 is a passenger compartment.

27 to 29 are the power plants 14
The first to third supporting means 27 support the power plant 14 at three points at different positions, and the first supporting means 27 supports the power plant 14 on the right side of the vehicle compartment 26 side (rearward) in the vehicle longitudinal direction from the power plant center of gravity G. In the vicinity of the suspension tower 10 supporting the suspension member 25 on the side wall 5 of the suspension tower 1
0 and side members 12. The second support means 28 elastically supports the power plant 14 on the side member 12 in the vicinity of the side member 12 of the left side wall 4 on the side (rear) of the vehicle compartment 26 in the vehicle longitudinal direction with respect to the power plant center of gravity G. It is something to do. moreover,
The third support means 29 includes the power plant 14
The front member 1 is located on the opposite side (front) of the first and second support means 27 and 28 in the longitudinal direction of the vehicle body with respect to the power plant center of gravity G, and near the front member 13 constituting the horizontal member 6.
3. It provides elastic support. Further, the support point of the first support means 27 is located above the power plant center of gravity G, the support point of the third support means 29 is located below the power plant center of gravity G, and the support point of the second support means 28 is located above the power plant center of gravity G. The points are the first and third support means 2
7 and 29, and therefore, the first to third supporting means 27 to 29 are arranged so that the center of gravity G of the power plant is located near the plane containing each of the supporting means 27 to 29. has been done.

Furthermore, the first and second support means 27, 2
8 is located so as to be spatially parallel to the torque roll axis R of the power plant 14, and the third support means 29 is positioned so as to be spatially parallel to the torque roll axis R of the power plant 14.
and located on the opposite side of the second support means 27,28. By arranging each of the support means 27 to 29 in this manner and having the shapes at the same position as described later, the roll elastic principal axis of the power plant 14 is set to substantially coincide with the torque roll axis R.

Here, the above-mentioned torque roll shaft R refers to the shaft where torque is generated (crankshaft of the power plant 14).
It is an axis determined by the roll inertia main axis which is the rotation center in the roll direction among the three inertia main axes of the power plant 14, and when torque around the crankshaft is applied to the unrestrained power plant 14 (rigid body), the power is This refers to the axis around which the plant 14 actually rotates, and when the engine 17 is rotating at a high speed, that is, when the power plant 14 is receiving high-frequency torque fluctuations where the forced vibration frequency≫natural frequency is approximately the torque roll axis R. It rotates and vibrates around the . In FIG. 2, a differential gear 19 is a shaft that provides a reaction force to the power plant 14.
The principal axis of roll inertia X is inclined at an angle α (actually about 10° to 15°) from the horizontal through the center of gravity G of the power plant with respect to a line l parallel to the output axis of the
With respect to the main axis of roll inertia X, the torque roll axis R
is inclined by an angle β through the power plant center of gravity G. The relationship between angles α and β is tanβ=
(Ix/Iz) tan α (Ix: moment around the main axis of roll inertia X, Iz: moment around the main axis of yawing inertia). Further, in FIG. 2, Y is the yawing axis of the power plant 14, and the yawing axis Y passes through the power plant center of gravity G and is approximately perpendicular to the road surface (horizontal surface). It vibrates around it. Further, the above-mentioned roll elastic main axis refers to the power plant 14 (rigid body) that is elastically supported by a plurality of supporting means when a static torque is applied around its crankshaft. This refers to the axis of rotation, and when the forced vibration frequency of the power plant 14 is low (when the engine speed is low), the rotational vibration axis of the power plant 14 approaches this axis.

In addition, each of the support means 27 to 29 is connected to the vehicle body 1 (in the case of the first support means 27, the suspension tower 10, the side member 12, the In the case of the second support means 28, the side member 12; in the case of the third support means 29, the front member 13)
An inner cylinder 32 is pivotally connected to the power plant 14 by a bolt 31 via a bracket 30; an outer cylinder 34 is connected to the power plant 14 via a bracket 33 and is disposed coaxially with the inner cylinder 32; Outer cylinder 3
4 and an elastic member 35 made of rubber or the like interposed therebetween, and elastically supports the power plant 14 via the elastic member 35. Further, the axes (bolts 31) of the inner cylinders 32 of each of the support means 27 to 29 are set to substantially coincide with the tangential direction of a circle centered on the yawing axis Y of the power plant 14, It is configured to receive yawing (rotation around the yawing axis Y) by shearing of the elastic members 35 of each of the support means 27 to 29.

Specifically, each of the supporting means 27 to 29 has an inner cylinder 32 whose axis is approximately parallel to the road surface (horizontal surface),
The second support means 27 and 28 are arranged in the longitudinal direction of the vehicle body, and the third support means 29 is arranged in the width direction of the vehicle body.

Furthermore, the support positions and support points of the power plant 14 by each of the support means 27 to 29 are the elastic member 35
is the elastic center of , and in the case of the above example,
This is the center of the shape of the elastic body 35.

Therefore, in the above embodiment, the engine horizontally mounted power plant 14 is mounted at different positions in the vehicle body 1 (both side walls 4, 5 and the side walls 4, 5 and Elastically supported by the member 6), and the power plant 1
4, the center of gravity G of the first to third supporting means 27 to 29
By locating the power plant 14 in the vicinity of a plane containing the power plant 14, rolling of the power plant 14 can be effectively suppressed without requiring a torque block or the like, and the power plant 14 can be firmly and reliably supported against rolling. Can be done. Furthermore, even if a cooler compressor or the like is added to the power plant 14,
Since the weight ratio is small compared to the entire power plant 14 and its center of gravity G is only slightly shifted,
It is also effective in this case. Moreover, since the power plant 14 does not require a torque rod or the like and is not directly supported by the vehicle interior wall 3 (dash panel 7), the transmission of vibrations and noise to the vehicle interior can be significantly reduced.

Furthermore, since the first and second support means 27, 28 are spatially parallel to the torque roll axis R of the power plant 14, and the third support means 29 is located on the opposite side of the torque roll axis R, It becomes possible to align the roll elastic principal axis of the power plant 14 with the torque roll axis R. As a result, the rolling axis of the power plant 14 is always constant, and the elastic members 3 of each support means 27 to 29
The deformation directions of the parts 5 are always the same, making it easy to create a vibration-proof structure and easily absorb vibrations.

In addition, each support means 27 to 29 is composed of an inner cylinder 32, an outer cylinder 34, and an elastic member 35 disposed between the inner and outer cylinders 32 and 34, and each support means 27 to 2
Since the axis of the inner cylinder 32 of 9 substantially coincides with the tangential direction of a circle centered on the yawing axis Y of the power plant 14, the yawing of the power plant 14 is caused by shearing of the elastic members 35 of the respective support means 27 to 29. Since the mount rigidity can be lowered against yawing caused by engine vibration, power plants with large torque fluctuations such as 3- or 5-cylinder engines can be
4, the yawing of the power plant 14 can be effectively absorbed and alleviated, and the power plant 14 can be supported even more firmly and reliably.

Moreover, the axes of the inner cylinders 32 of each of the supporting means 27 to 29 are arranged so as to substantially coincide with the tangential direction of the circle centered on the yawing axis Y of the power plant 14 as described above, and the two side walls 4, two first and second support means 27, each attached to 5;
28, the axis of the inner cylinder 32 is arranged in the longitudinal direction of the vehicle body, and the other third support means 29 is arranged so that the axis of the inner cylinder 32 is arranged in the width direction of the vehicle body on the horizontal member 6 extending in the width direction of the vehicle body according to engine rule 2. Therefore, in response to the lateral acceleration, longitudinal acceleration, and vertical acceleration of the power plant 14, the tension/compression of the elastic member 35 in at least one of the three supporting means 27 to 29 is Since the acceleration can be absorbed and the mount rigidity against such load fluctuations can be increased, the power plant 14 can be firmly and reliably supported even against such load fluctuations. Therefore, the power plant 14 can be supported firmly and reliably against all acting forces.

It should be noted that the present invention is not limited to the above-mentioned embodiment, but also includes various other modifications.For example, in the above-mentioned embodiment, the case where it is applied to a front engine/front drive type automobile is described. Of course, the present invention can also be applied to rear engine/rear drive type (R/R type) automobiles.

Further, in the above embodiment, the first support means 27 is placed on the right side wall 5, and the second support means 28 is placed on the left side wall 4.
Although they are attached to each other, the arrangement may be reversed. In addition, the inner cylinder 32 of each support means 27 to 29 was connected to the vehicle body 1 side, and the outer cylinder 34 thereof was connected to the power plant 14 side, but conversely, the inner cylinder 32 was connected to the power plant 14 side, and the outer cylinder 34 was connected to the power plant 14 side. Needless to say, it may be connected to the vehicle body 1 side.

Furthermore, a fourth support means may be provided near the third support means 29 to support the power plant 14 at four points.

Furthermore, in the above description, a power plant with a horizontal engine is described, but it can also be applied to a power plant with a vertical engine.

(Effects of the Invention) As explained above, according to the present invention, the power plant is elastically supported at three points, and the center of gravity of the power plant is located near a plane passing through the three support points. Rolling can be effectively suppressed without torque block. Furthermore, by aligning the axis of the inner cylinder of each support means with the tangential direction of a circle centered on the yawing axis of the power plant, the yawing of the power plant is received by the shearing of the elastic member and is effectively absorbed and alleviated. In addition, by arranging the axes of the inner cylinders of two support means in the longitudinal direction of the vehicle body and the axis of the inner cylinder of the other support means in the width direction of the vehicle body, the lateral acceleration of the power plant, the longitudinal acceleration Since directional acceleration and vertical acceleration can be received and absorbed by the tension/compression of at least one elastic member, the power plant can be supported firmly and reliably.
It also has excellent effects, such as being advantageous in preventing the transmission of vibrations and noise to the passenger compartment.

[Brief explanation of drawings]

The drawings illustrate embodiments of the invention.
The figure is a horizontal plan view of the engine compartment of a front-engine, front-drive type automobile, FIG. 2 is a longitudinal sectional front view of the same, and FIG. 3 is a longitudinal sectional side view of the same.
FIG. 4 is an enlarged cross-sectional view of the first support means. 1... Vehicle body, 2... Engine room, 3... Vehicle interior wall, 4... Right side wall, 5... Right side wall, 6
...Horizontal member, 7...Dutsche panel, 11...Wheel apron, 12...Side member, 13
...Front member, 14...Power plant, 17...Engine, 18...Transmission, 19...Differential gear, 27...
First support means, 28... Second support means, 29...
Third support means, 32...inner cylinder, 34...outer cylinder, 3
5...Elastic member, Y...Yawing axis, G...Power plant center of gravity.

Claims (1)

[Claims] 1. A power plant located in an engine room surrounded by a vehicle interior wall and two side walls extending in the longitudinal direction of the vehicle body from both sides of the vehicle interior wall, is supported elastically by the vehicle body at different positions. A support device for a power plant in an automobile, comprising support means, and the three support means are positioned so that the center of gravity of the power plant is near a plane containing each support means, wherein each of the support means or an inner cylinder connected to either one of the car bodies, an outer cylinder connected to the other side of the power plant or the car body and arranged coaxially with the inner cylinder, and an elastic member arranged between the inner cylinder and the outer cylinder. Two of the above-mentioned supporting means are attached to two different side walls so that the axis of the inner cylinder is in the longitudinal direction of the vehicle body, and the other supporting means is The axis of the inner cylinder of each support means is attached to a member extending in the width direction of the vehicle body in the engine room so that the axis of the inner cylinder is in the width direction of the vehicle body, and the axis of the inner cylinder of each support means is oriented in the tangential direction of a circle centered on the yaw axis of the power plant. A support device for a power plant in an automobile, characterized in that the support device substantially corresponds to the following.