JPS5822720A - Support of power plant in automobile - Google Patents

Abstract

PURPOSE:To improve the vibration absorption performance of the power plant by a method wherein the engine transversely installed type power plant is supported resiliently by three point, two of which are positined in parallel to a power plant torque roller shaft and the other one of which is positioned on the opposite side of the torque roller shaft. CONSTITUTION:When the power plant 14 is supported by support members 27- 29 each comprising an inner and an outer cylinder 32 and 34 and a resilient member 35 interposed between the cylinders, two of the support members 27 and 28 are located in parallel to the torque roller shaft R of the power plant 14, and supported on the side walls 4 and 5 on the passanger room 26 side in the forward and backward direction with respect to the center of gravity G of the power plant 14. The remaining support member 28 is located on the opposite side to the support members 27 and 28 with respect to the torque roller shaft R, and supported on a front member 13 of a transverse bar 6. Further, the support member 27 is positioned at a higher position than the center of grvity G of the power plant 14, whereas the support member 29, at a lower position. The support member 28 is postioned at a middle point between the support members 27 and 29. This construction is very effective for improving the vibration absorption performance of the power plant.

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 of a horizontally mounted engine type.

Generally, front engine/front drive type (F
', ET' type automobiles or rear engine barrier 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. There is.

In addition, compared to vertically-mounted engines, such horizontally-mounted engine type warp plants are more likely to generate large rotational vibrations in the longitudinal direction due to torque fluctuations, drive reaction forces, road reaction forces, etc. A torque rod (roll stopper) was installed between the upper part of the plant and the passenger compartment wall of the vehicle body that partitions the engine room and the passenger compartment. Since the torque rod is connected orthogonally to the torque rod, it is weak in strength, and there is a problem in that vibration or noise is directly transmitted to the passenger compartment through the torque rod.

Therefore, conventionally, the above-mentioned 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 measuring section 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, rotational vibration of the power plant in the longitudinal direction can be suppressed without the need for the torque rod as described above. A system that firmly supports the power plant has been proposed (see Japanese Utility Model Application Publication No. 54-5233).

By the way, in a power plant that is elastically supported by the vehicle body as described above, rotational vibration (rolling) in the longitudinal direction of the power plant occurs when dynamic torque acts on the power plant, for example, when the engine rotates at high speed. When receiving high-frequency torque fluctuations, rotational vibrations occur approximately around the torque roll axis of the power plant, while at low engine speeds, this rotational vibration axis is the center of vibration when static torque is applied to the power plant. The main axis of roll elasticity is different from the roll axis, and because the rolling axis of the power plant is not fixed, the deformation direction of each elastic member that elastically supports the power plant does not match, causing vibrations of the power plant. In view of this point, the present invention has been made to further improve the above proposal, and the power plant located in the engine room surrounded by the vehicle body is In addition to providing three support means that elastically support the vehicle body at certain positions, and positioning the three support means so that the center of gravity of the power plant is near the plane containing each support means, By locating two of the support means parallel to the torque roll axis of the power plant and the other 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. The rolling axis of the power plant is always kept constant by matching the rolling axis of the power plant, so that 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. It is an object of the present invention to provide a support device for a power plant in a motor vehicle.

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 (F, F type) automobile. In Figure 1 to Figure 3, 1 is the vehicle body,
2 is an engine room provided in the front of the vehicle body 1, and the engine room 2 includes a vehicle interior wall 6 of the vehicle body 1, left and right side walls 4, 5 extending forward from both sides of the vehicle interior wall 5, and It is surrounded by a horizontal member 6 that connects the front ends of both side walls 4 and 5. The vehicle interior wall 6 includes a dash panel 7, a floor 8 connected rearward from the lower end of the dash panel 7,
It is comprised of an angled reinforcing member 9 that reinforces the connecting portion between the dash panel 7 and the floor 8. Each of the side walls 4.5 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 16 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 12.

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 cleaner 15, an exhaust manifold 16, etc., a transmission 18, a differential gear 19, an alternator 20, and 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
2 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; 25 is an engine compartment 2;
24 is the front fender, 2 is the bonnet that covers the top of the
5 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 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 elastically applied to the front member 1'5 in the vicinity of the front member 15 constituting the transverse member 6, which is 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. 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 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 27.29
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.

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,
With respect to a line I 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 X passes through the power plant center of gravity G at an angle α (actually about 100 to 15 degrees) 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 angles α and β is tanβ−H, tanα
(Moment X 2: Moment around the main axis of inertia of the roll 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 surface). 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 52 is pivotally connected to the side member 12 in the case of the support means 28 and a front member 16 in the case of the third support means 29 via a bracket 50 with a bolt 51, and a bracket 5'5 is connected to the power plant 14. It is composed of an outer cylinder 54 which is connected through the inner cylinder 52 and arranged coaxially with the inner cylinder 52, and an elastic member 65 made of rubber or the like which is interposed between the inner cylinder 52 and the outer cylinder 54. Power plant 14 via the elastic member 55
It has elastic support. Furthermore, each of the above-mentioned supporting means 27 to 2
The shaft (bolt 51) of the inner cylinder 52 of 9 is connected to the power plant 14
The yawing axis Y of the power plant 14 is set to substantially coincide with the tangential direction of a circle centered on the yawing axis Y, and the yawing (rotation around the yawing axis Y) of the power plant 14 is controlled by the support means 2
7-290 is configured to receive the shearing force of the elastic member 55.

Specifically, each support means 27 to 29 has an inner cylinder 62 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 and support point of is an elastic member! This is the elastic center of +5, and in the case of the above embodiment, it is the center of the shape of the elastic body 55.

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
0 Rotational vibration in the front-rear 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 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 attached to one side wall 5 (suspension tower 10 and side member 12) of the engine room 2, 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 other side wall 4 (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).
Vibration and noise transmission to a single room can be significantly reduced.

Further, each of the support means 27 to 29 supports the power plant 14 in the vicinity of both side walls 4 and 5 constituting the engine room 2 and the transverse member 6 (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 is now possible to align the elastic roll axis of the power plant 14 with the torque roll axis R, so that even when dynamic and static torques act on the power plant 14, the rolling axis of the power plant 14 is always aligned. The deformation direction of the elastic member 65 of each support means 27 to 29 is always the same, so that it becomes easier to provide a vibration isolation structure for the power plant 14.
Vibrations of the power plant 14 can be easily and reliably absorbed.

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. 29 elastic members! Since the vibration is received by a shear of +5, the yawing can be effectively absorbed and alleviated, and the vibration isolation 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. However, it goes without saying that 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. Further, the inner cylinder 52 of each support means 27 to 29 was connected to the side of the vehicle body 1, and the outer cylinder 34 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 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 effectively reducing rolling of the power plant. In addition, by aligning the roll elastic main axis of the power plant with the torque roll axis, vibration absorption of the power plant can be easily made, so the power plant can be supported firmly and reliably. It also has excellent practical effects, such as being advantageous in preventing the 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・・Wheel apron, 12
...Site member, 15...Front member, 14
・・Power plant, 17・・Engine, 18・・Transmission, 19・・Differential gear, 27
...first support means, 28..second support means, 29..third support means, 52..inner cylinder, 54..outer cylinder, 55..elastic member, Y..yawing axis, G.. Power plant center of gravity.

Claims (1)

[Scope of Claims] ill Three supporting means for elastically supporting a power plant disposed in an engine room surrounded by a vehicle body on the vehicle body at different positions, and the three supporting means are connected to each other so that the center of gravity of the power plant is Two of the three support means are placed parallel to the torque roll axis of the power plant, and the other support means is positioned in the vicinity of the plane containing the support means. A support device for a power plant in an automobile, characterized in that the device is located on the opposite side. (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 the two first and second supporting means parallel to the torque roll axis of the power plant are arranged so that the power plant is placed on the vehicle interior side in the longitudinal direction from the center of gravity of the power plant. The third supporting means, which is supported near the side walls on both sides via elastic members, is arranged on the opposite side of the torque roll shaft to support the power plant in the longitudinal direction with respect to the center of gravity of the power plant. A support device for a power plant in an automobile according to claim 1, wherein the support device for a power plant in a motor vehicle is supported on the side opposite to the support means and in the vicinity of the side member through an elastic member. (3) The engine room is provided at the front of the vehicle body, the horizontal member is a front member forming a closed cross section below the front end of the vehicle body, and the support point of the first support means is located above the center of gravity of the power plant, and the third support The support point of the means is below the center of gravity of the power plant, and the support point of the second support means is below the center of gravity of the power plant.
and a support device for a power plant in an automobile according to claim (2), which are respectively disposed between the support points of the third support means. (4) The side wall has a side wall with a closed cross section, the side member is connected at the front end to the front wall, and the second support means is attached to the side member. 3) A support device for a power plant in an automobile according to item 3).