JPS5822719A - Supporter of power plant in automobile - Google Patents

Abstract

PURPOSE:To suppress the rolling and yawing of the power plant by a method wherein the engine transversely installed type power plant is supported by three support members each having a shaft in the tangent direction of a circle drawn around the yawing shaft of the power plant in such a manner that the gravity center of the power plant is positioned in the vicinity of a plane including the three support points. CONSTITUTION:When the power plant 14 is supported by three support members 27-29, each comprising an inner and an outer cylinder 32 and 34 and a resilient member 35 interposed between the cylinders, the center of gravity G of the power plant 14 is positioned in the vicinity of the plane including these three support members 27-29, and also the shaft of the inner cylinder 32 is substantially aligned with the tangent direction of the circle drawn aound the yawing shaft Y of the power plant 14. According to this construction, the yawing of the power plant 14 is received by the shear of each resilient member 35. In addition, the rolling of the power plant 14 can be suppressed without using a torque rod or the like. Thus, a firm and secure support of the power plant can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a power plant in an automobile, and more particularly to a support device for a power plant with a horizontally mounted engine.

General, front engine/front drive model (F
, F type) automobiles or rear engine rear drive type (R, R type) automobiles are equipped with a transverse engine type power plant consisting of a transversely placed engine, transmission, differential gear, etc. .

In addition, such power plants with horizontally mounted engines are more likely to generate large rotational vibrations in the longitudinal direction due to torque fluctuations, drive reaction forces, and road reaction forces than those with vertically mounted engines. A torque rod (roll stopper) was interposed between the upper part and the cabin wall of the car body that partitions the engine room and the single compartment, but one end of the torque rod was placed against the single compartment wall. Since the torque rods are connected perpendicularly to each other, they are weak in strength, and vibrations or noise are directly transmitted to the passenger compartment through the torque rods.

Therefore, in the past, the above-mentioned engine horizontal type power plant was supported using three support points: a lower support member that bears most of the weight of the power plant, and two support members that face each other on the side wall of the engine room. Moreover, by locating the center of gravity of the power plant within the area formed by connecting the three support points mentioned above, rotational vibration of the power plant in the longitudinal direction can be suppressed without the need for the above-mentioned torque rod. It has been proposed to firmly support the power plant (see Japanese Utility Model Application Publication No. 54-5233).

By the way, in engines where large torque fluctuations occur, such as 3-cylinder or 5-cylinder engines, there is a problem that in addition to rotational vibration of the power plant in the longitudinal direction (rolling), the power plant also rotates in the left-right direction (yawing). However, the above-mentioned 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 includes three supports that elastically support the power plant located in the engine room surrounded by the vehicle body at different positions on the vehicle body. means, and in addition to positioning the three support means so that the center of gravity of the power plant is near a plane containing each support means, each support means is connected to either the power plant or the vehicle body. an outer cylinder connected to the other side of the power plant or the vehicle body and disposed coaxially with the inner cylinder, and an elastic member disposed between the inner cylinder and the outer cylinder, and By making the axis of the inner cylinder of each support means approximately coincide 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 of each support means. Effectively absorb and relax,
Therefore, it is an object of the present invention to provide a support device for a power plant in a motor vehicle, which can effectively suppress rolling and yawing of the power plant and support the power plant firmly and reliably.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

1 to 3 show an example in which the present invention is applied to a front engine/front drive type (FF' type) automobile. In Figures 1 to 3, 1 is the vehicle body, 2
is an engine room provided in the front of the vehicle body 1,
The engine room 2 includes a compartment wall 6 of the vehicle body 1 and a compartment wall 6 of the vehicle body 1.
It is surrounded by left and right side walls 4, 5 extending forward from both sides, and a horizontal member 6 connecting the front ends of the both side walls 4, 5. The vehicle interior wall 5 includes a dash panel 7, a floor 8 continuous to the rear from the lower end of the dash panel 7, and an eyelet-shaped reinforcing member 9 for reinforcing the continuous portion between the dash panel 7 and the floor 8. It is made up of. Each of the side walls 4 and 5 is composed of a suspension tower 10 and a wheel apron 11 that are integrally formed, and has a side member 12 on the inner surface that extends in the front-rear direction and forms a closed cross section with the wheel apron 11. are doing. The side member 12 forms a vertically branched closed section 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 15 having a closed section below the front end of the vehicle body 1, and both ends of the front member 15 are connected to the front ends of the side members 120.

Reference numeral 14 denotes a horizontal engine type power plant disposed in the engine room 2, and the power plant 14 includes an engine 17 equipped with an air tank 11-15, an exhaust manifold 16, etc., a transmission 18, a differential gear 19, It includes 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 lateral direction of the vehicle, and the axes of each cylinder are arranged in the vertical direction. Furthermore, 2
1 is an axle shaft extending in the left-right direction connected to the differential gear 19; 22 is an axle shaft 21;
26 is the bonnet that covers the top of the engine compartment 2, 24 is the front fender,
25 is a suspension member, and 26 is a vehicle compartment.

Reference numerals 27 to 29 are first to third supporting means for supporting the power plant 14 at three different positions;
The support means 27 supports the power plant 14 in the vicinity of the suspension tower 10 which is on the vehicle interior 26 side (backward) in the longitudinal direction from the power plant center of gravity G and supports the suspension member 25 on the right side wall 5.
The second support means 28 elastically supports the power plant 14 and the side members 12.
is elastically supported by the side member 12 in the vicinity of the side member 12 of the left side wall 4 on the vehicle compartment 26 side (rearward) in the longitudinal direction from the power plant center of gravity G,
Further, the third support means 29 is configured to support the power plant 14.
is elastically supported by the front member 15 on the opposite side (front) of the first and second support means 27, 28 in the longitudinal direction with respect to the power plant center of gravity G and near the front member 15 constituting the transverse member 6. It is something. 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 point is located midway between the first and third support means 27, 29, so that the first to third support means 27 to 29 are arranged so that the center of gravity G of the power plant is at the center of each support means 2.
It is configured to be located near a plane including 7 to 29.

Furthermore, the first and second support means 27, 28 are located parallel to the torque roll axis R of the power plant 14, and the third support means 29 is located parallel to the torque roll axis R of the power plant 14.
located on opposite sides of said first and second support means 27,28.

By arranging each of the support means 27 to 29 in this manner and having the same shape 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 torque roll axis R is an axis determined by the axis where torque is generated and the main axis of roll inertia, and when torque around the crankshaft is applied to the unrestrained power plant 14 (rigid body), the power plant 14 is The axis around which the engine 17 rotates is the rotational vibration approximately around the torque roll axis R when the engine 17 rotates at a high speed, that is, when the power plant 14 is subjected to high frequency torque fluctuations that correspond to its natural frequency (forced frequency of the power plant 14). It is something to do. In Figure 2,
The main axis of roll inertia X passes through the power plant center of gravity G at an angle a (actually 10° to 15°) from the horizontal with respect to a line l parallel to the output axis of the differential gear 19, which is the axis that applies a reaction force to the power plant 14. ), and with respect to the principal axis of torque inertia X, the torque roll axis R is inclined at an angle β through the power plant center of gravity G.

The relationship between the angles α and β is tanβ=, -, tanα (engine x: moment around the main axis of roll inertia X, Iz: moment around the main axis of yawing inertia). In addition, in FIG. 2, Y is the yawing axis of the power plant 14,
The yawing axis Y passes through the center of gravity G of the power plant and is substantially perpendicular to the road surface (horizontal surface), and in a three-cylinder or five-cylinder engine, etc., vibrations occur as the yaw axis rotates. Also,
The above-mentioned roll elastic main axis refers to the axis around which the power plant 14 rotates when a static torque is applied to the elastically supported power plant 14 (rigid body). When the frequency is low (engine speed is low), the power plant 140 rotation vibration axis 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 second In the case of the support means 28, the side member 12, in the case of the third support means 29, the front member 1'5) is connected to the shaft by a bolt 51 via a bracket 50, and the power plant 14.
The outer cylinder is connected to via the bracket 55 and arranged coaxially with the inner cylinder 62! +4 and an elastic member 65 made of rubber or the like interposed between the inner cylinder 52 and the outer cylinder 54, and elastically supports the power plant 14 via the elastic member 55. Chiru. Furthermore, each of the support means 27
The axis (volt!+1) of the inner cylinder 52 of ~29 is set to approximately coincide with the tangential direction of a circle centered on the yawing axis Y of the power plant 14, and the yawing of the power plant 14 (around the yawing axis Y) rotation) is received by the shearing of the elastic members 55 of each of the support means 27 to 29.

Specifically, each support means 27-29 is an inner cylinder! +2
is approximately parallel to the road surface (horizontal surface), and the first and second support means 27 and 28 are arranged such that the third support means 2
9, it is placed in the lateral direction of the car.

Moreover, the power plant 14 by each support means 27 to 29
The support position/support point is the center of elasticity of the elastic member 55, and in the case of the above embodiment, is the center of the shape of the elastic body 65.

Therefore, in the above embodiment, the vehicle body 1 (both side walls 4 and 5 and the horizontal member 6 ) with elastic support,
In addition, by locating the center of gravity G of the power plant 14 near the plane containing the first to third support means 27 to 29, rolling of the power plant 14 is effectively suppressed without requiring a torque rod or the like. Therefore, the power plant 14 can be supported firmly and reliably. Further, even if a cooler compressor or the like is added to the power plant 14, the weight ratio is small compared to the entire power plant 14, and its center of gravity G is only slightly shifted, so this is also effective in this case. Moreover, the power plant 14 does not require a torque rod or the like, and can be mounted on the vehicle interior wall 5 (dash panel 7).
Since it is not directly supported by the vehicle, the transmission of vibration and noise to the passenger compartment can be greatly reduced.

Furthermore, the first and second support means 27,28 are 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, so that the power plant 14 It becomes possible to align the elastic roll axis of the power plant 14 with the torque roll axis R, so that the rolling axis of the power plant 14 is always constant, and the deformation directions of the elastic members 55 of each support means 27 to 29 are always the same. Therefore, it is easy to adopt a vibration-proof structure and vibration absorption becomes easy.

In addition, each of the supporting means 27 to 29 is composed of an inner cylinder 62, an outer cylinder 54, and an elastic member 55 disposed between the inner and outer cylinders 52,54, and the inner cylinder 52 of each of the holding means 27 to 29 is Since the axis substantially coincides with the tangential direction of a circle centered on the yaw axis Y of the power plant 14, the power plant 1
The elastic members of each support means 27 to 29 control the yawing of 4! +
Power plants 14 that experience large torque fluctuations, such as 3- or 5-cylinder engines, which cannot be subjected to high shear
Even in this case, 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.

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 attached to the right side wall 5 and the second support means 28 is attached to the left side wall 4, but the arrangement may be reversed. In addition, the inner cylinder 52 of each support means 27 to 29 was connected to the vehicle body 1 side, and the outer cylinder 54 thereof was connected to the power plant 14 side, but conversely, the inner cylinder 52 was connected to the power plant 14 side, and the outer cylinder 54 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.

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 supported at three points.
The rolling of the power plant can be effectively suppressed by being located near a plane passing through two support points, and the yawing of the power plant can be effectively absorbed and alleviated by receiving the yawing of the power plant by shearing the elastic member. , it has excellent effects such as being able to firmly and reliably support the power plant and also being advantageous in preventing transmission of vibrations and noise to the passenger compartment.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a cross-sectional plan view of the engine compartment of a front-engine/front-drive automobile, FIG. 2 is a longitudinal sectional front view, and FIG. 3 is a longitudinal sectional side view. , FIG. 4 is an enlarged cross-sectional view of the first support means. 1. Vehicle body, 2. Engine room, 5. Vehicle interior wall, 4
...Left side wall, 5...Right side wall, 6...Horizontal member, 7
・・Dash panel, 11 rewheel apron, 12・
・Side member, 15・・Front member, 14・
・Power plant, 17. Engine, 18. Transmission, 19. Differential gear, 27.
-First support means, 28...Second support means, 29...Third
Supporting means, 52...inner cylinder, 54...outer cylinder,! +5: Elastic member, Y: Yawing axis, G: Power plant center of gravity.

Claims (2)

[Claims] (1) Three support means for elastically supporting the power plant located in the engine compartment surrounded by the vehicle body at different positions, and the three support means are arranged so that the center of gravity of the power plant A support device for a power plant in an automobile positioned near a plane containing the power plant, wherein each of the supporting means includes an inner cylinder connected to either the power plant or the vehicle body, and a power plant (power plant).
or an outer cylinder connected to the other side of the vehicle body and arranged coaxially with the inner cylinder, and an elastic member arranged between the inner cylinder and the outer cylinder, while the inner cylinder of each of the support means A support device for a power plant in an automobile, wherein the axis of the power plant substantially coincides with the tangential direction of a circle centered on the yaw axis of the power plant. (2) The engine room is surrounded by a cabin wall of the vehicle body, two side walls extending in the front-rear direction from both sides of the cabin wall, and a horizontal member connecting the both side walls. The engine is arranged horizontally in the engine room, and two of the three supporting means are attached to two different side walls so that the axis of the inner cylinder is in the front-rear direction. , the other supporting means is attached to the horizontal member so that the axis of the inner cylinder is in the horizontal direction.