JPH0126892B2 - - 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 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, road reaction forces, etc. than those with vertically mounted engines.
Normally, a torque rod (roll stopper) was interposed between the upper part of the power plant 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 is attached to the passenger compartment wall. Since the torque rod is connected orthogonally to the torque rod, it is weak in strength, and vibrations or noise are directly transmitted to the passenger compartment through the torque rod.

Therefore, conventionally, the engine horizontally mounted 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.
In addition, by locating the center of gravity of the power plant within the area formed by connecting the above three support points, it is possible to suppress the rotational vibration of the power plant in the longitudinal direction without requiring a torque block as described above. A system that firmly supports the power plant has been proposed (see Utility Model Application Publication No. 54-5233).

(Problem to be Solved by the Invention) By the way, in a power plant that is elastically supported by the vehicle body as described above, dynamic torque acts on the power plant as longitudinal vibration (rolling) of the power plant. For example, when the engine rotates at high speeds or receives high-frequency torque fluctuations, it vibrates around the torque roll axis of the power plant, while when the engine rotates at low speeds, this rotational vibration axis applies static torque to the power plant. The main axis of roll elasticity is different from the above-mentioned torque roll axis, which is the center of vibration when the power plant rolls, and because the rolling axis of the power plant is not fixed, the deformation direction of each elastic member such as rubber that elastically supports the power plant is the same. It has the disadvantage of not being able to sufficiently absorb the vibrations 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 compartment surrounded by the vehicle body at different positions. In addition to positioning the three support means so that the center of gravity of the power plant is near the plane containing each support means, two of the three support means are positioned so that the center of gravity of the power plant is near the plane containing each support means. By locating the other support means spatially parallel to the torque roll axis and on the opposite side of the torque roll axis, the main roll elastic axis of the power plant is aligned with the torque roll axis and the power A power plant for an automobile in which the rolling axis of the plant is always constant, and the deformation direction of each elastic member that elastically supports the power plant is always the same, so that vibrations of the power plant can be easily absorbed. The purpose of the present invention is to provide a support device for the following.

(Means for Solving the Problems) For this purpose, the present invention provides a power plant consisting of an engine and a transmission fixed to the side thereof in an engine room surrounded by a vehicle body at different positions. The first to elastically supported on the vehicle body.
a third support means, the three support means support the first support means disposed near the engine side of the power plant so that the center of gravity of the power plant is near the plane containing each support means; The support point of the second support means is located above the center of gravity of the power plant, the support point of the third support means is located below the center of gravity of the power plant, and the support point of the second support means is located near the transmission side of the power plant. The first and second support means are arranged intermediately between the support points of the first and third support means, and the first and second support means are arranged spatially parallel to the torque roll axis of the power plant, and the first and second support means are arranged spatially parallel to the torque roll axis of the power plant. The third support means is arranged on the opposite side of the torque roll axis from the first and second support means. This makes it possible to easily locate the center of gravity of the power plant near the plane containing the three support points, making torque rods unnecessary, and aligning the torque roll axis with the roll elastic principal axis. This makes it possible to keep the rolling axis of the power plant constant at all times and to sufficiently absorb vibrations of the power plant.

(Example) Hereinafter, an example of the present invention will be described in detail based on 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 FIGS. 1 to 3, 1 is a vehicle body, and 2 is an engine room provided in the front of the vehicle body 1.
The vehicle interior wall 3 of the vehicle body 1, the left and right side walls 4, 5 extending forward from both sides of the vehicle interior wall 3, and the both side walls 4,
5 and a horizontal member 6 connecting the front ends thereof. The vehicle interior wall 3 includes a darts panel 7
, a floor 8 connected rearward from the lower end of the darts panel 7, and the darts panel 7 and the floor 8.
and an angled reinforcing member 9 that reinforces the continuous portion. Further, the side walls 4 and 5 are each integrally formed with a suspension tower 1.
0 and a wheel apron 11, 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. 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 13 having a closed section below the front end of the vehicle body 1, and both ends of the front member 13 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. 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 lateral direction of the vehicle, and the axes of each cylinder are arranged in the vertical direction. In addition, 21 is an axle shaft connected to the differential gear 19 and extends in the left-right 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 compartment 2, and 24 is a front flap. Ender, 25 is a suspension member, 2
6 is a vehicle compartment.

27 to 29 are the power plants 14
The first to third supporting means 27, which are arranged near the engine 17 side of the power plant 14, support the power plant 14 from the power plant center of gravity G in the longitudinal direction. The suspension tower 1 is located near the suspension tower 10 that supports the suspension member 25 of the right side wall 5 on the chamber 26 side (rear side).
0 and side members 12. Further, the second support means 28 disposed near the transmission 18 side of the power plant 14 supports the power plant 14 on the vehicle interior 26 side (backward) in the longitudinal direction from the power plant center of gravity G and on the left side wall 4. It is elastically supported by the side member 12 in the vicinity of the side member 12. Furthermore, the third support means 29 supports the power plant 14 on the opposite side (front) 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 transverse member 6. It is elastically supported by the front member 13 in the vicinity of the front member 13. Further, the support point of the first support means 27 is the center of gravity G of the power plant.
The support point of the third support means 29 is located above the power plant center of gravity G, and the support point of the second support means 28 is located between the first and third support means 27 and 29. It has been, and it has been
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, 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 supporting means 27 to 29 in this way 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 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 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. It rotates and vibrates around R. In FIG. 2, the power plant 14
Differential gear 1 is the shaft that provides a reaction force to
9, the main axis of roll inertia With respect to X, the torque roll axis R is inclined through the power plant center of gravity G by an angle β. The relationship between angles α and β is
tanβ=(Ix/Iz) tanα (Ix: moment around the main axis of roll inertia X, Iz: moment around the main axis of yawing inertia). 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 substantially orthogonal to the road surface (horizontal surface).
4 vibrates around this axis. Also,
The above-mentioned roll elastic main axis refers to the axis around which the power plant 14 actually rotates when a static torque is applied around the crankshaft to the power plant 14 (rigid body) which is elastically supported by a plurality of means. Okay, when the forced vibration frequency of the power plant 14 is low (when the engine speed is low), the power plant 1
The rotational vibration axis of No. 4 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 lateral direction of the vehicle.

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 by the three first to third supporting means 27 to 29, and the side walls 4 and 5 and the horizontal member 6 that constitute the engine room 2 are arranged in different positions.
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 in the longitudinal direction from the power plant center of gravity G. The third support means 29 is located near the other (rear) side wall 4, and the third support means 29 is located on the opposite (front) side of the first and second support means 27, 28 in the longitudinal direction with respect to the power plant center of gravity G. By locating the power plant 14 in the vicinity, 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, thereby reducing rotational vibration of the power plant 14 in the longitudinal direction. can be effectively suppressed,
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 power plant 14 as a whole, 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, the support point of the third support means 29 is placed below the power plant center of gravity G, and the support point of the second support means 28 is placed at the first and third points.
It is preferable to arrange it between the support means 27 and 29 because it facilitates installation of the power plant center of gravity G on a plane passing through these three support points.

Moreover, the first support means 27 is
The second support means 28 is attached to one side wall 5 (suspension tower 10 and side member 12), the second support means 28 is attached to the other side wall 4 (side member 12), and the third support means 29 is attached to the existing front member constituting the transverse member 6. 13, and can be firmly supported using existing components without the need for new members, thus eliminating the need for conventional torque rods and subframes extending in the longitudinal direction of the vehicle body. do not. Further, the third support means 2
When the power plant 9 is attached to the horizontal member 6, the power plant 14 is not directly supported by the vehicle interior wall 3 (dash panel 7), so that the transmission of vibrations and noise to the vehicle interior can be greatly reduced.

Furthermore, when each of the supporting means 27 to 29 is installed to support the power plant 14 in the vicinity of the side walls 4 and 5 constituting the engine room 2 and the transverse member 6 (front member 13) at the front and rear of the vehicle body, Assembling and maintenance services for the power plant 14 can be performed with good work efficiency.

In addition, since the first and second support means 27, 28 are located spatially parallel to the torque roll axis 6 of the power plant 14, and the third support means 29 is located on the opposite side of the torque roll axis R, The roll elastic main axis of the power plant 14 is the torque roll axis R.
As a result, even if dynamic and static torques act on the power plant 14, the axis of rolling of the power plant 14 is always constant, and each support means 2
The deformation directions of the elastic members 35 7 to 29 are always the same, which makes it easier to provide a vibration isolation structure for the power plant 14.
4 can be easily and reliably absorbed.

Furthermore, since the axes of the inner cylinders 32 of the respective support means 27 to 29 substantially coincide 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
29 by the shearing of the elastic member 35, the yawing can be effectively absorbed and alleviated, and the vibration damping performance for the power plant 14 can be further improved.

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.

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 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 of an automobile 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, thereby generating power. Rolling of the plant can be effectively suppressed without the need for torque blocking or the like. Further, by arranging the first and second support means spatially parallel to the torque roll axis of the power plant and the third support means on the opposite side of the torque roll axis, the roll elastic principal axis of the power plant is aligned with the torque roll axis. As a result, the rolling axis of the power plant is always constant, and the directions of elastic deformation of each support means are always the same, making it possible to easily absorb vibrations of the power plant. Therefore, the power plant can be strongly and reliably supported. Moreover, it has excellent practical 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 cross-sectional plan view of the engine compartment of a front-engine, front-drive type automobile, FIG. 2 is a longitudinal front view of the same, FIG. 3 is a longitudinal side view of the same, and FIG. be. 1... Vehicle body, 2... Engine room, 3... Vehicle interior wall, 4... Left 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, R...Torque roll shaft, G...
Power plant center of gravity.

Claims (1)

[Scope of Claims] 1. A power plant consisting of an engine and a transmission fixed to the side of the engine in an engine room surrounded by the vehicle body is elastically supported by the vehicle body at different positions. The first support means is provided with three support means, and the three support means are arranged near the engine side of the power plant so that the center of gravity of the power plant is near the plane containing each support means.
the second support means, wherein the support point of the support means is located above the center of gravity of the power plant, the support point of the third support means is located below the center of gravity of the power plant, and near the transmission side of the power plant; a support point is disposed intermediate the support points of the first and third support means, respectively, and the first and second support means are disposed spatially parallel to a torque roll axis of the power plant. A support device for a power plant in an automobile, wherein the third support means is disposed on the opposite side of the torque roll shaft from the first and second support means. 2. The engine room is surrounded by a cabin wall of the vehicle body, two side walls extending from both sides of the cabin wall in the longitudinal direction of the vehicle body, and a horizontal member connecting the both side walls. The engine is placed horizontally in the room,
Further, the two first and second supporting means parallel to the torque roll axis of the power plant support the power plant on the passenger compartment side in the longitudinal direction of the vehicle body from the center of gravity of the power plant and near the side walls on both sides through elastic members. The third support means on the opposite side of the torque roll shaft supports the power plant in the longitudinal direction of the vehicle body with respect to the center of gravity of the power plant, on the opposite side of the first and second support means and in the vicinity of the transverse member. 2. A support device for a power plant in an automobile according to claim 1, wherein the device is supported on a horizontal member via an elastic member. 3. The automobile according to claim 1, wherein the side wall has a side member with a closed cross section, the side member is connected to the front member at the front end, and the second support means is attached to the side member. Power plant support equipment.