JP2596062Y2 - Automotive power unit support structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power unit support structure for an automobile.

[0002]

2. Description of the Related Art In a motor vehicle, a power unit including an engine, a transmission, and the like is elastically supported at a plurality of positions on a vehicle body via mount rubbers. 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, reducing vehicle interior noise, and the like. (See, for example, Japanese Utility Model Laid-Open No. 28522/1985).

[0003]

However, since each mount rubber of the power unit must support the mass of the power unit itself, the spring constant cannot be reduced so much, and the engine rotation such as the reaction torque of the drive torque fluctuation can be reduced. Therefore, it is difficult to sufficiently absorb the vibration generated based on the vehicle interior noise, and it is difficult to further reduce the vehicle interior noise.

An object of the present invention is to address the above-mentioned conventional problems.

[0005]

According to the present invention, there is provided a power unit for a vertically mounted automobile using a horizontally opposed engine or a V-type engine, a center mount provided substantially immediately below a center of gravity of the power unit, and a power unit. Is approximately equidistant across the torque roll axis of the power unit at the front end of the
Wherein the front-mounted left and right provided to the left and right portions of the release, by the rear mount which is arranged on the torque roll axis of the rear end portion of the power unit, that is supported via the mount rubber the power unit to the vehicle body It is assumed that.

[0006]

With the above construction, the center mount supports almost the entire mass of the power unit, and the left and right front mounts and the rear mount hardly share the mass of the power unit. The spring constant of the mount rubber can be made sufficiently low, and tuning to match the elastic main shaft of each mount rubber against the vibration around the torque roll axis becomes possible, improving the vibration absorption function and reducing the vehicle interior noise. Can be measured.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

The power unit to be used in the present invention is a vertically installed power unit using a horizontally opposed engine or a V-type engine as shown in FIGS. 1 to 3, and is located almost directly below the center of gravity G of the entire power unit 1. The center mount 2 is mounted on an engine mount cross member (not shown), so that the center mount 2 supports almost the entire mass of the power unit 1.

Right and left front mounts 3 and 4 are provided on the left and right portions of the power unit 1 at substantially the front end, respectively, with a torque roll axis XX.
(If the external force is only the torque fluctuation around the crankshaft X'-X ', the engine vibrates around the torque roll axis XX). And 4 are supported on the left and right portions of the vehicle body (not shown).

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

As described above, the power unit 1 is supported on the vehicle body at four points of the center mount 2, the left and right front mounts 3, 4 and the rear mount 5, so that almost all of the power unit 1 is provided. The mass is supported by the center mount 2, and the vibration in the rolling direction is mainly received by the left and right front mounts 3, 4 and the vibration in the pitch direction is mainly received by the left and right front mounts 3, 4 and the rear mount 5. 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 constant of each mount rubber of the front mounts 3, 4 and the rear mount 5 is sufficiently reduced. To adjust the three main elastic axes of the mount rubber against vibration around the torque roll axis XX. In this way, the vibration in the rolling direction and the pitch direction and the vibration during idling can be sufficiently absorbed, and the left and right front mounts 3 and 4 and the rear mount 5 Since the spring constant of each mount rubber is set sufficiently low and the mount rubber of the center mount 2 is sheared, the vibration is sufficiently absorbed and the transmission of vibration to the vehicle body can be significantly reduced. In addition, since it can be supported with a sufficiently wide span for a large input in the pitch and roll directions, it is also advantageous in terms of supporting strength.

In the case of a horizontally opposed engine or a V-type engine, since the vibrating force in the vertical direction is relatively small, the mass of the power unit is increased by the center mount 2 located immediately below the center of gravity G of the power unit 1 as described above. Although it is possible to support the portion, a large peak of the vertical resonance related to the spring constant of the center mount 2 appears in response to the vertical vibration input from the underbody, so that the center mount 2 is formed of a liquid-containing mount, It is necessary to attenuate the vertical vibration input by the liquid mount.

In the above, each mount is provided with a stopper for suppressing an excessive displacement of the power unit 1 as in the conventional configuration. For example, for a large upward displacement, the upper displacement stopper of the center mount 2 is mainly provided. so,
Accordingly, the upper displacement stoppers of the left and right front mounts 3 and 4 suppress excessive upward displacement of the power unit 1, and for large downward displacements, the compression of the mount rubber of the center mount 2 and the downward displacement stopper are mainly used. Accordingly, it is received by the lower displacement stoppers of the left and right front mounts 3 and 4. A large rearward displacement is suppressed by a rearward displacement stopper of the left and right front mounts 3 and 4 and a rearward displacement stopper of the center mount 2, and a large forward displacement is suppressed by a frontal displacement stopper of the left and right front mounts 3 and 4. . Large displacements in the left-right direction are to be suppressed in all mounts.

[0014]

As described above, according to the present invention, in a vertical power unit using a horizontally opposed engine or a V-type engine, a center mount located almost directly below the center of gravity of the power unit, Above the front end
And front-mounted left and right located approximately equidistant lateral portion across the torque roll axis of Wayunitto, mount rubber a power unit with a rear mount located on said torque roll axis of the rear end portion of the power unit to the vehicle body , The three points of the left and right front mount and the rear mount hardly share the power unit mass, and the spring constant of the three points of the mount rubber can be sufficiently reduced. The roll and pitch direction vibration absorption function of the power unit can be significantly improved.
In addition, it is possible to tune the vibration around the torque roll axis of the power unit and the elastic main shafts of the above three points of the mount rubber, so that the vibrations during idling are sufficiently absorbed and the noise in the vehicle interior can be significantly reduced. In addition to the simple structure and the low cost, a great effect can be obtained in practical use.

[Brief description of the drawings]

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

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

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

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60K 5/02 B60K 5/12

Claims (2)

(57) [Scope of request for utility model registration] 1. A power unit for a vertically mounted vehicle using a horizontally opposed engine or a V-type engine, a center mount provided substantially immediately below a center of gravity of the power unit, and the power unit substantially at a front end of the power unit. No
The left and right front mounts provided on the left and right portions at approximately the same distance across the lukroll shaft , and the rear end of the power unit
To the rear mount which is disposed on the torque roll axis
Ri, power unit support structure of a motor vehicle, characterized in that supported via the mount rubber the power unit to the vehicle body side. 2. The center mount according to claim 1, wherein the center mount has a liquid-containing mount structure, and the center mount supports substantially the entire mass of the power unit, and a vertical vibration input is attenuated by the liquid-containing mount. A power unit support structure for an automobile, characterized in that: