JP2511303Y2 - Vehicle power unit support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a support device for a power unit mounted in a lateral direction of a vehicle body.

[Prior Art] It is known that during idling operation of an automobile or the like, two-node bending vibration is induced in a vehicle body by rolling vibration of a power unit mainly including an edge and a transmission. In order to reduce the idling vibration, the vertical component generated by the rolling vibration of the power unit is
It is required to have a structure that does not transmit to the vehicle body as much as possible.

Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 59-167327, in a supporting device for a power unit as an assembly of an engine and a transmission mounted in the lateral direction of a vehicle, the supporting device is Two on the center axis of rolling vibration and two on the center axis of yawing motion to achieve both idle vibration and reduction of engine shake, and to prevent induction of engine wind-up vibration. It is configured.

[Problems to be Solved by the Invention] In the supporting device of the power unit configured as described above, the central axis of the yawing motion of the power unit does not exist in the vertical plane of the power unit, and therefore the vertical direction is caused by the component force of the rolling vibration. There is a possibility that the vibration component of the vehicle may be generated to induce the two-node bending vibration of the vehicle body.

Also, by reducing the longitudinal spring constant of the supporting device arranged on the center axis of the yawing motion, the rolling rigidity is reduced, and the jerky vibration caused by the driving torque reaction force at the time of sudden acceleration and sudden deceleration is induced. There was a fear.

Furthermore, the spring constant in the vertical direction of the entire power unit support device becomes large, and due to the vertical vibration of the engine,
There was a risk that the high-speed muffled sound would deteriorate.

Further, the mount structure of the power unit disclosed in the embodiment 58-182832 is provided with the first and second mountaineering devices and the roll stoppers integrally provided in each of the mountaineering devices. However, there is a problem that the rolling vibration of the power unit cannot be sufficiently prevented only by the roll stopper integrated with the mountain device.

The present invention was devised in view of the above-mentioned problems of the prior art device, in which the rolling vibration of the power unit is made to be the longitudinal vibration at all the positions where the supporting devices are arranged, thereby eliminating the vertical component due to the rolling vibration. An object of the present invention is to provide a power unit supporting device for a vehicle, which can prevent induction of bimodal bending vibration of the vehicle body and greatly reduce idle vibration of the vehicle.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a power unit supporting device for a vehicle according to the present invention includes first and second power units for supporting front and rear end portions of a power unit mounted in a lateral direction of a vehicle body. The second elastic support device is disposed on the torque roll shaft of the power unit, and the third elastic support device having a torque stopper function is provided at a position below the front end portion of the power unit in a vertical plane including the torque roll shaft, The first and second
The third elastic support device is characterized in that the spring constant in the vertical direction is smaller than that in the horizontal direction, and the axis of the axis is oriented in the longitudinal direction of the power unit.

[Operation] Since the vehicle power unit support device of the present invention is configured as described above, it operates as follows.

First, since the first and second elastic support devices 5 and 7 are arranged on the torque roll axis XX, which is the center of rolling vibration during idling operation of the power unit 3, the first and second elastic support devices are provided. The supporting devices 5 and 7 have the axis X-X.
Vibration does not occur in any of the up / down, front / rear, and left / right directions.

Next, since the third elastic support device 9 is disposed outside the torque roll axis XX, which is the center of the roll vibration, as described above, it has the roll stopper function and the third elastic support device. 9 is the torque roll axis XX
Since the power unit is provided at a position below the front end of the power unit in the vertical plane, vibration in the vertical and horizontal directions does not occur, and only vibration in the front-back direction occurs.

Therefore, the rolling vibration of the power unit 3 is only the vibration in the front-back direction. This vibration has a spring constant in the vertical direction smaller than that in the horizontal direction, and the third elastic support device 9 whose axial center is oriented in the longitudinal direction of the power unit. Since it is mainly absorbed and the vertical vibration component is not transmitted to the vehicle body, the induction of the bimodal bending vibration of the vehicle body is eliminated, and the idle vibration is greatly reduced.

In addition, since the first and second elastic support devices 5 and 7 are arranged on the torque roll axis X, the rolling vibration and the bounce vibration can be decoupled from each other, and the body shake resistance at high speed running can be improved. improves.

Furthermore, the first, second and third elastic support devices 5, 7, 9
As described above, since the spring constant in the vertical direction is larger than the spring constant in the horizontal direction, the rolling rigidity of the power unit 3 is increased, and the jerky contact caused by the torque reaction force at the time of sudden acceleration and sudden deceleration. Vibration is reduced, and deterioration of steering stability and torque steer, which are problems in lateral placement of the power unit 3 (lateral placement), are prevented.

Further, since the spring constants of the elastic supporting devices 5, 7, 9 in the vertical direction are made small, the transmission and interruption effect of the vertical vibration of the power unit is further improved, and the middle and high speed muffled noises are reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

A power unit 3 including an assembly of an engine 1 and a transmission 2 has a first elastic support device 5 attached to an upper portion of a front end portion thereof via a bracket 4 and a lower elastic portion of a rear end portion thereof via a bracket 6. The second elastic support device 7 attached, and further the third elastic support device 9 attached via a bracket 8 to the lower portion of the front end portion of the power unit 3.
Is placed in the lateral direction of the vehicle body.

CG is the center of gravity of the power unit 3, XX is the torque roll axis that is the center of roll vibration when excited by the torque fluctuation of the power unit 3, and TT is the torque axis that is the center of torque generated by the power unit 3. Are shown respectively.

As shown in FIG. 4, the first elastic support device 5 includes an inner cylinder 11 concentrically provided inside the outer cylinder 10, and a vibration isolator extending in the lateral direction connecting the outer cylinder 10 and the inner cylinder 11. The outer cylinder 10 and the vibration-proof rubber 12 are provided with cavities 13 and 14 in the vertical direction, which makes the vertical spring constant smaller than the horizontal spring constant. .

The second elastic support device 7 and the third elastic support device 9 also have the same configuration as that of the first elastic support device 5.

Further, as described above, the first elastic support device 5 is attached to the upper portion of the front end portion of the power unit 3 via the bracket 4, and the first elastic support device 5 is attached to the lower portion of the rear end portion of the power unit 3 via the bracket 6. 2 The elastic support device 7 is the torque roll axis X of the power unit 3 passing through its center of gravity CG.
-X, and their axes are mounted laterally, that is, in the longitudinal direction of the power unit 3.

Further, the third elastic supporting device 9 mounted on the lower portion of the front end portion of the power unit 3 via the bracket 8 is disposed outside the torque roll axis XX, and has a vertical plane including the torque roll axis XX. It is positioned so that it lies inside and its axis is mounted laterally, i.e. in the longitudinal direction of the power unit 3.

Since the power unit supporting device for a vehicle of the present invention is configured as described above, it operates as follows.

First, since the first and second elastic support devices 5 and 7 are arranged on the torque roll axis XX, which is the center of rolling vibration during idling operation of the power unit 3, the first and second elastic support devices are provided. The devices 5 and 7 do not generate vibrations in any of the vertical, front-rear, and left-right directions due to rolling vibrations.

Next, since the third elastic support device 9 is arranged outside the torque roll axis XX, which is the center of the roll vibration as described above, it has the roll stopper function and the third elastic support device 9 is provided. Is provided at a position below the front end of the power unit in the vertical plane including the torque roll axis XX, so that vibration in the vertical and horizontal directions does not occur, and only vibration in the front-back direction occurs. There is no.

Therefore, the rolling vibration of the power unit 3 is only the vibration in the front-rear direction. This vibration has a vertical spring constant smaller than that in the horizontal direction, and the axial center of the third elastic support is oriented in the longitudinal direction of the power unit. Since it is mainly absorbed by the device 9 and the vertical vibration component is not transmitted to the vehicle body, the induction of the two-node bending vibration of the vehicle body is eliminated, and the idle vibration is greatly reduced.

In addition, since the first and second elastic support devices 5 and 7 are arranged on the torque roll axis X, the rolling vibration and the bounce vibration can be decoupled from each other, and the body shake resistance at high speed running can be improved. improves.

Furthermore, the first, second and third elastic support devices 5, 7, 9
As described above, since the spring constant in the vertical direction is larger than the spring constant in the horizontal direction, the rolling rigidity of the power unit 3 becomes large, and the jerk caused by the torque reaction force at the time of sudden acceleration and sudden acceleration is increased. Vibration is reduced, and deterioration of steering stability and torque steer, which are problems in lateral placement of the power unit 3 (lateral placement), are prevented.

Further, since the spring constants of the elastic supporting devices 5, 7, 9 in the vertical direction are made small, the transmission and blocking effect of the vertical vibration of the power unit is further improved, and the middle and high speed muffled noises are reduced.

[Advantages of the Invention] As described above, the power unit supporting device for a vehicle according to the present invention includes the first and second elastic supporting devices for supporting the front and rear end portions of the power unit placed in the lateral direction of the vehicle body. It is arranged on the torque roll shaft of
A third elastic support device having a torque stopper function is provided at a position below a front end portion of the power unit in a vertical plane including the torque roll shaft, and the first, second and third elastic support devices are provided.
The elastic support device is characterized in that the spring constant in the vertical direction is smaller than that in the horizontal direction, and the axis of its axis is oriented in the longitudinal direction of the power unit. Then, all of them are made to be longitudinal vibrations to eliminate the vertical component due to rolling vibrations, which can prevent the induction of bimodal bending vibrations of the vehicle body, greatly reduce the idle vibrations of the vehicle, and keep the vertical spring constant horizontal. By using the elastic support device that is smaller than the direction and has its axis centered in the longitudinal direction of the power unit, the rolling rigidity of the power unit is increased and the jerky vibration of the vehicle is reduced.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a plan view of the same embodiment, FIG. 3 is an elevation view of the same embodiment, and FIG. 4 is a vertical cross section of a supporting device in the same embodiment. FIG. 5 and FIG. 5 are explanatory views of the arrangement position of the supporting device in the embodiment. 1 ... Engine, 2 ... Transmission, 3 ... Power unit, 5 ... First support device, 7 ... Second support device, 9 ...
Third support device, 10 ... Outer cylinder, 11 ... Inner cylinder, 12 ... Anti-vibration rubber, X ... Torque roll shaft.

Claims (1)

(57) [Scope of utility model registration request] 1. A first and a second elastic support device for supporting front and rear end portions of a power unit mounted in a lateral direction of a vehicle body are arranged on a torque roll shaft of the power unit and have a torque stopper function. A third elastic support device having
The first, second and third elastic supporting devices are provided at a position below the front end portion of the power unit within a vertical plane including the torque roll shaft, and the first, second and third elastic supporting devices have a spring constant in the vertical direction smaller than that in the horizontal direction, and A power unit supporting device for a vehicle, wherein an axis is oriented in a longitudinal direction of the power unit.