JP2869679B2 - Car 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 a motor vehicle, and more particularly to a power unit support structure for a motor vehicle having a power plant frame.

[0002]

2. Description of the Related Art Conventionally, a power unit including an engine and a transmission mounted on the front of a vehicle body and a differential mounted on the rear side of the vehicle body have a U-shaped cross section having a large bending rigidity and a flexibility against a screw. Rigidly connected through the power plant frame prevents the irregular swinging movement around the transverse axis passing through the engine support caused by the torque reaction of the power unit from being differentially transmitted, improving the ride comfort A known power unit support structure is known (see JP-A-56-28053). In this conventional power unit support structure, a power unit and a differential are attached to a cross member via respective mounts. Therefore, the entire drive train system including the power unit, the drive shaft, the power plant frame, and the differential is supported by the mount of the power unit and the mount of the differential.

[0003]

However, in the above-described conventional power unit support structure, for example, when the power from the drive shaft is differentially transmitted during rapid acceleration, the differential rotates and moves with respect to the output shaft. The transmission of power to the shaft of the rear wheel was delayed, which resulted in a problem of poor acceleration.

Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and provides a power unit support structure for a motor vehicle in which the rotation of a differential during sudden acceleration or the like is reduced and the acceleration performance is improved. It is intended to be.

[0005]

In order to achieve the above object, a first invention of the present application has a rigid frame connecting a power unit and a differential, and the power unit and the differential are respectively mounted on a vehicle body via mounts. In the power unit support structure of the vehicle to be mounted, the power unit mount is arranged forward of the center of gravity of the entire drive train system including the power unit, the differential and the frame, and the differential mount is arranged behind the output shaft of the differential. .

According to a second aspect of the present invention, there is provided a power unit supporting structure for an automobile having a rigid frame connecting the power unit and the differential, and mounting the power unit and the differential to the vehicle body via mounts, respectively. The power unit mount is disposed behind the center of gravity of the entire drive train system including the frame, and the differential mount is disposed forward of the output shaft of the differential.

The first and second embodiments of the present invention configured as described above
In the inventions described above, both the static load and the reaction force of the differential generated during rotation of the differential act as opposing forces due to the drive train system generated by the mounting of the differential. Therefore, the rotation of the differential during sudden acceleration etc. is reduced,
Acceleration is improved.

[0008]

1 to 4 show an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a side view showing an embodiment of a power unit support structure for an automobile according to the present invention. 1 and 2, reference numeral 1 denotes the entire drive train system. The drive train system 1 is configured as follows. That is, the power unit 2 is mounted on the front of the vehicle body, and the power unit 2 includes the engine 3 and the transmission 4. A differential 5 is mounted on a rear portion of the vehicle body, and the differential 5 has an output shaft 8. Power unit 2
And the differential 5 are connected by a power plant frame 6. The power plant frame 6 is formed to have a U-shaped cross section that is opened laterally, has high bending rigidity, and has flexibility against torsion. The power unit 2 and the differential 5 are connected to a drive shaft 7.
And the power of the engine 3 is transmitted to the rear wheels via the drive shaft 7 and the differential 5.

As shown in FIG. 1, point A indicates the position of the center of gravity of the drive train system 1 including the power unit 2, the differential 5, the power plant frame 6, and the drive shaft 7. Power unit 2 is mounted 1
0, the cloth member 11 is further fixed to a vehicle body (not shown). Similarly, the differential 5 is attached to a cross member 13 by a mount 12, and the cross member 13 is further fixed to a vehicle body (not shown).

Further, the mount 10 of the power unit 2
Are located forward of the point A which is the position of the center of gravity of the drive train system 1. The mount 5 of the differential 5 is disposed behind the output shaft 8 of the differential 5. Next, the operation of the above embodiment will be described. In the above embodiment, since the mount 10 of the power unit 2 is disposed forward of the point A which is the position of the center of gravity of the drive train system 1, a downward static load acts on the mount 5 of the differential 5. I have. During rapid acceleration, the differential 5 rotates counterclockwise in FIG. At this time, differential 5
Is disposed behind the output shaft 8 of the differential 5, an upward reaction force acts on the mount 5 of the differential 5. Therefore, the static load (downward) acting on the mount 5 of the differential 5 and the reaction force (upward) due to the differential 5 are opposing forces. Therefore, the rotation of the differential 5 at the time of sudden acceleration or the like is reduced, and the acceleration is improved.

Next, another embodiment of the present invention will be described with reference to FIG. This embodiment and the embodiment shown in FIGS. 1 and 2 have the same basic configuration, but differ in the following points. That is, in this embodiment, the mount 10 of the power unit 2 is disposed behind the point A which is the position of the center of gravity of the drive train system 1. The mount 5 of the differential 5 is a differential 5
Is disposed forward of the output shaft 8.

In this embodiment, the power unit 2
Is located behind the point A which is the position of the center of gravity of the drive train system 1, an upward static load is applied to the mount 5 of the differential 5. At the time of rapid acceleration, the differential 5 rotates counterclockwise in FIG. At this time, since the mount 5 of the differential 5 is disposed forward of the output shaft 8 of the differential 5, a downward reaction force acts on the mount 5 of the differential 5. Therefore, the static load (upward) acting on the mount 5 of the differential 5 and the reaction force (downward) due to the differential 5 are opposing forces. Therefore, also in this embodiment, similarly, the rotation of the differential 5 at the time of sudden acceleration or the like is reduced, and the acceleration performance is improved.

Although the above embodiment is of a type in which the power unit is directly connected to the engine and the transmission, the present invention is also applicable to a type in which the engine and the transmission are connected via a drive shaft.

[0014]

As described above, in the present invention,
Due to the drive train system generated in the differential mount, the static load and the reaction force received by the differential mount generated during the rotation of the differential act as opposing forces, so the rotation of the differential during sudden acceleration etc. is reduced, and the acceleration performance is reduced. Can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of a power unit support structure for an automobile according to the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a side view showing another embodiment of the power unit support structure for a vehicle according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive train system 2 Power unit 3 Engine 4 Transmission 5 Differential 6 Power plant frame 7 Drive shaft 8 Differential output shaft 10 Mount 12 Mount

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60K 5/02 B60K 5/12 B60K 17/06 B60K 17/16

Claims (2)

(57) [Claims] 1. A power unit support structure for an automobile, comprising a rigid frame connecting a power unit and a differential, and mounting the power unit and the differential to a vehicle body via mounts, respectively, wherein the entire drive train system includes the power unit, the differential and the frame. A power unit support structure for a motor vehicle, wherein a mount of the power unit is arranged forward of a center of gravity of the vehicle and a differential mount is arranged behind an output shaft of the differential. 2. A power unit supporting structure for a vehicle, comprising a rigid frame connecting a power unit and a differential, and mounting the power unit and the differential to a vehicle body via mounts, respectively, wherein the entire drive train system includes the power unit, the differential and the frame. A power unit support structure for an automobile, wherein the mount of the power unit is arranged behind the center of gravity of the vehicle, and the mount of the differential is arranged ahead of the output shaft of the differential.