JPS5822718A - Supporter of power plant in automobile - Google Patents

Abstract

PURPOSE:To suppress the rotation vibration of the power plant and also prevent the transmission of noise vibration of the power plant to a passanger room by a method wherein the engine transversely installed power plant is supported by three-pointed resilient support, two points positioned in the vicinity of the side wall on the passenger room side in the forward and backward direction with the gravity center of the power plant sandwiched therebetween, and the other point positioned in the vicinity of a transverse bar. CONSTITUTION:The first one of the support members 27, 29, each comprising an inner and an outer cylinder 32 and 34 and a resilient member 35 interposed between the cylinders, is located on the passenger room 26 side in the forward and backward direction with respect to the center of gravity G of the power plant 14 and supported by a side member 12 in the vicinity of a suspension tower not shown of a right side wall 5. The second support member 28 is supported similarly on the side member 12 of a left side wall 4. The third support member 29 is located on the opposite side to the support members 27 and 28 in the forward and backward direction with respect to the center of gravity G and supported by a front member 13, that is, the transverse bar. In this instance, the support member 27 is positioned at a higher position than the center of gravity G of the power plant 14, whereas the support member 29, at a lower position. The support member 28 is positioned at a middle point between the support members 27 and 29. This construction is very effective for suppressing the rotation vibration of the power plant and preventing the transmission of noise vibration of the power plant to the passenger room.

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.

Generally, front engine/front drive type (F
, F model) or rear engine/rear drive model (R, R model) vehicles are equipped with a transverse engine power plant with a transversely mounted engine, transmission, differential gear, etc. .

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

Therefore, conventionally, the above-mentioned horizontally mounted power plant tractor is supported at three supporting points: a lower support member that bears most of the weight of the power plant, and both measuring section support members facing 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 above three support points, rotational vibration of the power plant in the longitudinal direction can be suppressed without the need for the above-mentioned torque rod. A system has been proposed in which the power plant is firmly supported by the power plant (see Japanese Utility Model Application No. 54-5233).

However, in this proposal, since the lower support member of the power plant bears most of the weight of the power plant, it is located almost directly below the power plant, and therefore the vertical member to which the lower support member is attached is Since a new subframe (subframe) is required, and the vertical member is connected to the interior wall (dash board), there is a drawback that vibration and noise are transmitted to the vehicle interior via the vertical member.

The present invention has been made in view of these points, and it is possible to elastically support a horizontally mounted engine type power plant on a vehicle body at three different support points, without requiring the above-described torque rod or vertical member, and to support the power plant at three different support points. The center of gravity of the plant can be located near the plane that includes these three support points, thereby effectively suppressing rotational vibration of the power plant in the longitudinal direction while preventing the transmission of vibration and noise to the passenger compartment. It is an object of the present invention to provide a support device for a power plant in an automobile, which can firmly and reliably support the power plant.

That is, the present invention provides an engine room surrounded by a passenger compartment wall of a vehicle body, two side walls extending in the front-rear direction from both sides of the passenger compartment wall, and a horizontal member connecting the both side walls, and an engine room in the engine room. a power plant arranged horizontally, and a first support means for supporting the power plant on the side wall via an elastic member in the vicinity of one side wall on the vehicle interior side in the longitudinal direction from the center of gravity of the power plant; a second support means for supporting the power plant on the passenger compartment side in the longitudinal direction relative to the power plant center of gravity and near the other side wall via an elastic member; The third support means is provided on the opposite side of the first and second support means and near the cross member and supports the cross member via an elastic member.

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. 1 to 3, 1 is a vehicle body, and 2 is an engine room provided at the front of the vehicle body 1. Left and right side walls 4, 5 extending forward from
, 5 and a horizontal member 6 connecting the front ends of the two. The vehicle interior wall 5 includes a dash panel 7, a floor 8 connected rearward from the lower end of the dash panel 7, and an angled reinforcing member 9 for reinforcing the connected portion between the dash panel 7 and the floor 8. It is made up of. Further, 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 forming a closed section below the front end of the vehicle body 1, and both ends of the front member 1!1 are connected to the front ends of the side members <-12.

Reference numeral 14 denotes a horizontal engine type power plant disposed in the engine room 2, and the ζ warplant 14 includes:
It includes an engine 17 equipped with an air cleaner 15, an exhaust manifold 16, etc., a transmission engine 18, a differential gear 19, an alternator 20, a cooler compressor (not shown), etc., and the engine 17 is located on the right side of the engine room 2. It is arranged so that it is placed horizontally. 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. still,
21 is an axle shaft connected to the differential gear 19 and extends in the left-right direction; 22 is an axle shaft 2;
10 is left and right front wheels attached to both ends, 2'5 is a bonnet that covers the upper surface of the engine room 2, 24 is a front fender, 25 is a suspension member, and 26 is a passenger 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 member 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 includes the power plant 14
is located on the opposite (front) side of the first and second support means 27 and 28 in the longitudinal direction with respect to the power plant center of gravity G and constitutes the horizontal member 6 (near -13). I support it.

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 second support means 28 The supporting points of the first and third supporting means 27.2
Therefore, the first to third supporting means 27 to 29 are arranged so that the center of gravity G of the power plant is near the plane containing each of the supporting means 27 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 way and having the same shape as described later, the power plant 140
The main axis of roll elasticity 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 rotational vibration approximately around the torque roll axis R when the engine 17 is rotating at a high speed, that is, when the power plant 140 is receiving high-frequency torque fluctuations that are the natural frequency (forced frequency). It is something. In Figure 2,
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, the main axis of roll inertia With respect to the principal axis of torque inertia X, the torque roll axis R is inclined through the power plant center of gravity G by an angle β. The relationship between this x angle α and β is tanβ=x, tanα
(Work X: moment around the main axis of roll inertia X, work 2: moment around the main axis of yawing inertia). In addition, 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 plane). It vibrates around this axis. In addition, the roll elastic main axis refers to an axis around which the power plant 14 rotates when a static torque is applied around the axis to the elastically supported power plant 14 (rigid body). When the forced frequency of 14 is low (
When the 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 An inner cylinder 62 is pivotally connected to the side member 12 in the case of the support means 28 and the front member 15 in the case of the third support means 29 via a bracket 50 with a bolt 51, and an inner cylinder 62 is connected to the power plant 14 via a bracket 55. It is composed of an outer cylinder 54 which is connected and arranged coaxially with the inner cylinder 62, and an elastic member 65 made of rubber or the like which is interposed between the inner cylinder 52 and the outer cylinder 54. The power plant 14 is elastically supported via the member 55. Furthermore, each of the support means 27 to 29
The axis (bolt 61) of the inner cylinder 52 is set to substantially coincide with the tangential direction of a circle centered on the yawing axis Y of the power plant 14, and the yawing (rotation around the yawing axis Y) of the power plant 14 is Each of the above supporting means 27
-29 are configured to receive the shearing force of the elastic members 55.

Specifically, each of the support means 27 to 29 has an inner cylinder 52 whose axis is approximately parallel to the road surface (horizontal surface), and the first and second support means 27 and 28 have a third support in the longitudinal direction of the vehicle. Means 29
In this case, it is placed so that it is horizontal to the car.

Moreover, the power plant 14 by each support means 27 to 29
The support position/support point is the elastic center of the elastic member 650, and in the case of the above embodiment, it is the center of the shape of the elastic body S5.

Therefore, in the above embodiment, the engine horizontally mounted power plant 14 is elastically supported at different positions by the three first to third support means 27 to 29 on both side walls 4 and 5 and the horizontal member 6 that constitute the engine room 2. The first support means 27 is located near one side wall 5 on the vehicle interior side (backward) in the longitudinal direction from the power plant center of gravity G, and the second support means 28 is located on the vehicle interior side (rearward) in the longitudinal direction from the power plant gravity center G. The third support means 29 is located near the other side wall 4 of the power plant, and the third support means 29 supports the first and second supports in the longitudinal direction with respect to the power plant center of gravity G.
By locating it near the horizontal member 6 on the opposite side (front) of the support means 27 and 28, the center of gravity G of the power plant 14 can be located near the plane containing the first to third support means 27 to 29. Therefore, the power plant 14
It is possible to effectively suppress rotational vibration in the front-rear direction,
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. In particular, the support point of the first support means 27 is placed above the power plant center of gravity G, and the third
If the support point of the support means 29 is placed below the center of gravity G of the power plant, and the support point of the second support means 28 is placed between the first and third support means 27, 29, the plane passing through these three support points can be This is preferable because it facilitates the installation of the center of gravity G of the power plant.

Moreover, the first support means 27 is located on one side 115 (suspension tower 10 and side member 12) of the engine room 2, the second support means 28 is located on the other side wall 4 (side member 12), and the third support means 29 is located on the other side 115 (suspension tower 10 and side member 12). Since they are each attached to the existing front members 15 that make up the horizontal member 6, the existing members can be used for strong support without the need to provide new members, and therefore the conventional torque rods and sub No frame (vertical member) required. Also, because of this, the power plant 14 is not directly supported by the interior wall 5 (dash panel 7),
Transmission of vibration and noise to the passenger compartment can be reduced to the same level as a dog rag.

Furthermore, each of the support means 27 to 29 is connected to the power plant 14 in the vicinity of both side walls 4 and 5 constituting the engine room 2 and the transverse member 6C front member 15) at the front end of the vehicle body.
As a result, assembly and maintenance services of the power plant 14 can be performed with good work efficiency.

In addition, 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 on the opposite side of the torque roll axis R, so that the power plant It becomes possible to align the elastic roll axis 140 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 of the supporting means 27 to 290 are always the same. Therefore, it is easy to adopt a vibration-proof structure and vibration absorption becomes easy.

Further, since the axis of the inner cylinder 52 of each support means 27 to 29 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 controlled by each of the support means 27 to 29. 290 by the shearing of the elastic member 65, so that the yawing can be effectively absorbed and alleviated.

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.

As explained above, according to the present invention, subframes (
It is possible to support the engine/horizontal power plant at three points without using vertical members), and to locate the center of gravity of the power plant near a plane passing through the three support points. The structure effectively suppresses rotational vibration in the longitudinal direction and supports it firmly and reliably, and is advantageous in preventing transmission of vibration and noise to a single room, and is also useful for power plant assembly. It is also possible to improve the workability of maintenance services.

[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, 6. Vehicle interior wall, 4
...Left side wall, 5...Right side wall, 6...Horizontal member, 7
・・Dash panel, 11・・Wheel apron, 12
...Side members, 13...Front members (-11
4... Power plant, 17... Engine, 18... Transmission, 19... Differential gear, 2
7..First support means, 28..Second support means, 29..
Third support means, 52...inner cylinder! +4・・Outer cylinder, 55・
・Elastic member, G...) Center of gravity of warp plant.

Claims (1)

[Scope of Claims] +1) An engine room surrounded by a cabin wall of a vehicle body, two side walls extending in the front-rear direction from both sides of the single room wall, and a horizontal member connecting the both side walls, and an engine room in the engine room. A power plant arranged so that an engine is placed horizontally, and a first support means for supporting the power plant on the side wall via an elastic member in the vicinity of one side wall on the vehicle interior side in the longitudinal direction from the center of gravity of the power plant. and a second side wall supporting the power plant via an elastic member on the side wall near the other side wall on the vehicle interior side in the longitudinal direction from the center of gravity of the power plant.
support means; and a third support that supports the power plant on the side opposite to the first and second support means in the front-rear direction with respect to the center of gravity of the power plant and in the vicinity of the cross member via an elastic member. A support device for a power plant in an automobile, characterized by comprising means. (2) The engine room is provided at the front of the vehicle body, the horizontal member is a front menno below the front end of the vehicle body, the support point of the first support means is located above the center of gravity of the power plant, and the support point of the third support means is located above the center of gravity of the power plant. The support point of the second support means is located below the center of gravity of the power plant, and the support point of the second support means is located below the center of gravity of the power plant.
A support device for a power plant in a motor vehicle as claimed in claim 1, wherein the support device is arranged between the support points of the support means. (3) the side wall has a side member forming a closed cross section;
2. A support device for a power plant in a motor vehicle according to claim 2, wherein the side member is connected to the front member at a front end, and the second support means is attached to the side member.