JPH078035U - Power unit support structure for automobiles - Google Patents

Abstract

(57) [Abstract] [Purpose] In a vertically oriented power unit for an automobile using a horizontally opposed or V-type engine, the transmission of vibration of the power unit to the vehicle body side is absorbed and reduced to reduce vehicle interior noise. [Structure] A center mount 2 provided directly below the center of gravity G of the power unit 1, left and right front mounts 3 and 4 provided at the left and right of the front end of the power unit 1, and a rear provided at the rear end of the power unit 1. The power unit 1 is supported on the vehicle body side through mount rubbers at four points including the mount 5, and the center mount 2 supports almost the entire mass of the power unit 1, so that the power unit 1 receives vibration in the rolling direction. The spring constant of each mount rubber of the left and right front mounts 3 and 4 and the rear mount 5 which receives the vibration of the rear end portion of the power unit in the up, down, left, right, front and back directions can be made sufficiently low to improve the vibration absorbing function.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power unit support structure for an automobile.

[0002]

[Prior art]

 In automobiles, power units consisting of engines, transmissions, etc. are elastically supported at multiple points on the vehicle body side through mount rubber. The setting of the support points by the mount rubber and the support structure at each support point are extremely important in terms of reducing transmission of engine vibration to the vehicle body side, reducing vehicle interior noise, etc. Various types have been developed according to the format and the like (see, for example, Japanese Utility Model Laid-Open No. 60-28522).

[0003]

[Problems to be solved by the device]

 However, since each mount rubber of the power unit has to support the mass of the power unit itself, the spring constant cannot be lowered so much that the vibration generated by the engine rotation such as the driving torque fluctuation reaction force is sufficiently reduced. Cannot be absorbed, and it is difficult to further reduce vehicle interior noise.

The present invention aims to address the above-mentioned conventional problems.

[0005]

[Means for Solving the Problems]

 The present invention is directed to a vertically mounted power unit for an automobile using a horizontally opposed engine or a V-type engine. The center mount is provided substantially directly below the center of gravity of the power unit, and is provided at the left and right portions of the front end of the power unit. It is characterized in that the power unit is supported on the vehicle body side through mount rubbers at four positions, that is, left and right front mounts and a rear mount provided at a rear end portion of the power unit.

[0006]

[Action]

 With the above configuration, the center mount supports almost the entire mass of the power unit, and the left and right front mounts and the rear mount do not substantially share the mass of the power unit. The spring constant of can be made sufficiently low, and tuning that matches the elastic main shaft of each mount rubber to the vibration around the torque roll axis can be performed, improving the vibration absorption function and reducing the vehicle interior noise. You can

[0007]

【Example】

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

The power unit of the present invention is a vertically placed power unit that uses a horizontally opposed engine or a V-type engine as shown in FIGS. 1 to 3, and is directly below the center of gravity G of the entire power unit 1. By disposing the center mount 2 at a position and attaching the center mount 2 to an engine mount cross member (not shown), the center mount 2 supports almost the entire mass of the power unit 1.

Left and right front mounts 3 and 4 are provided on the left and right portions of the power unit 1 substantially at the front end thereof. Are oscillated about the torque roll axis XX) and are arranged at substantially equal distances, and are supported by the left and right front mounts 3 and 4 on the left and right parts of the vehicle body (not shown).

A rear mount 5 is arranged at a rear end portion of the power unit 1, and is supported by a vehicle body side member (not shown) by the rear mount 5.

As described above, the power unit 1 is supported on the vehicle body side at the four points of the center mount 2, the left and right front mounts 3, 4 and the rear mount 5, so that the power unit 1 is almost entirely The mass is supported by the center mount 2, and vibrations in the rolling direction are mainly received by the left and right front mounts 3, 4 and vibrations in the pitch direction are mainly received by the left and right front mounts 3, 4 and the rear mount 5. By the way, since the three points of the front mounts 3, 4 and the rear mount 5 hardly share the mass of the power unit 1, the spring constants of the mount rubbers of the front mounts 3, 4 and the rear mount 5 are sufficiently low. In addition, it is possible to adjust the elastic main axes of the above three mount rubbers to the vibration around the torque roll axis XX. Tuning is possible, vibrations in the rolling direction and pitch direction are absorbed, and vibrations during idling are sufficiently absorbed. Further, front and rear left and right front mounts 3, 4 and rear mounts for fine vibrations in the front-rear direction and the left-right direction. Since the spring constant of each mount rubber of No. 5 is set sufficiently low and the mount rubber of the center mount 2 is sheared and deformed, the vibration is sufficiently absorbed, and the vibration transmission to the vehicle body side can be remarkably reduced. It is also advantageous in terms of support strength because it can be supported with a sufficiently wide span for large input in the pitch and roll directions.

Since a vertically-opposed engine or a V-type engine has a relatively small vertical vibration force, as described above, the center mount 2 located directly below the center of gravity G of the power unit 1 has a large power unit mass. Although it is possible to support the part, a large peak of the vertical resonance that is involved in the spring constant of the center mount 2 with respect to the vertical vibration input from the underbody appears, so the center mount 2 is composed of a liquid-filled mount. It is necessary to attenuate the vertical vibration input with a liquid mount.

In the above, each mount part is provided with a stopper that suppresses excessive displacement of the power unit 1, which is the same as the conventional configuration. For example, when a large upward displacement occurs, the center mount 2 is mainly displaced upward. The stopper prevents the left and right front mounts 3, 4 from displacing upward, and the stopper prevents excessive displacement of the power unit 1 upward. For large downward displacement, the mount rubber of the center mount 2 is compressed and compressed. The downward displacement stopper is used so that the downward displacement stoppers of the left and right front mounts 3 and 4 receive it. Large rearward displacements are suppressed by the rear displacement stoppers of the left and right front mounts 3, 4 and the rearward displacement stoppers of the center mount 2, and large forward displacements are suppressed by the front displacement stoppers of the left and right front mounts 3, 4. suppress. Large displacement in the left and right directions should be suppressed in all mount parts.

[0014]

[Effect of device]

 As described above, according to the present invention, in a vertically placed power unit using a horizontally opposed engine or a V-type engine, a center mount located directly below the center of gravity of the power unit and a front end left and right portions of the power unit. The left and right front mounts and the rear mount located at the rear end of the power unit support the power unit on the vehicle body side through mount rubber. The three points of the rear mount do not contribute much to the power unit mass, and the spring constant of the mount rubber at these three points can be made sufficiently low, and the roll unit and pitch direction vibration absorption function of the power unit can be significantly improved. In addition, a tune that combines the vibration around the torque roll axis of the power unit and the elastic main axis of the mount rubber at the above three points. It is possible to reduce the noise in the vehicle interior by absorbing the vibration and absorbing the vibration at the time of idling, and it can bring a great practical effect in combination with the simple structure and cost reduction. It is a thing.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

2 is a side view of the power unit support structure shown in FIG. 1. FIG.

3 is a front view of the power unit support structure shown in FIG. 1. FIG.

[Explanation of symbols]

 1 Power unit 2 Center mount 3 Left front mount 4 Right front mount 5 Rear mount

Claims (2)

[Scope of utility model registration request] 1. In a vertically mounted power unit for an automobile using a horizontally opposed engine or a V-type engine, a center mount provided substantially directly below the center of gravity of the power unit and left and right portions of the front end of the power unit. A power unit support for an automobile, characterized in that the power unit is supported on the vehicle body side through mount rubbers at four positions, namely, left and right front mounts and a rear mount provided at a rear end portion of the power unit. Construction. 2. The center mount according to claim 1 has a liquid-containing mount structure, and the center mount supports almost the entire mass of the power unit, and the vertical vibration input is damped by the liquid-containing mount. A power unit support structure for an automobile, which is characterized in that