JPS5926485B2 - Power unit support device in automobiles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a support device for a power unit in an automobile;
In particular, a horizontal multi-cylinder engine with a crankshaft placed in the lateral direction of the vehicle is equipped with a transmission on the right or left side, and a differential gear is sequentially connected to the rear of the transmission.The asymmetrical power unit is suspended from the vehicle body. This support device appropriately suppresses vibrational displacement of the power unit, while sufficiently absorbing engine vibrations from idling to high-speed rotation, thereby blocking the transmission of vibrations to the vehicle body and improving the ride comfort of the vehicle. The purpose is to improve the

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are a plan view and a side view of a power unit, in which the power unit P has a crankshaft c
A horizontally in-line multi-cylinder engine E that is arranged laterally of the vehicle body F.
A transmission M is connected to the right side of the transmission M, and a differential device D is successively connected to the rear side of the transmission M, and drive shafts d and d connected to the drive wheels are connected to the left and right sides of the differential device D. It stands out.

This power unit P has two points located in front of its center of gravity G and located on the left and right sides of its center of gravity G, and
It is suspended from the lower surface of the vehicle body F by first, second, and third support devices 51, 52, and S3, respectively, at a point substantially located on a vertical plane in the longitudinal direction of the vehicle that passes through the center of gravity G of the vehicle. . During its operation, the power unit P generates longitudinal vibration Y caused by the reciprocating movement of the piston in the engine E, and lateral rotational vibration Zr around the center of gravity G.
The support device is designed to absorb longitudinal rotational vibrations Xr around the center of gravity G due to drive reaction forces of the drive shafts D and d, and to absorb these vibrations and suppress excessive displacement of the power unit P due to the vibrations. Sl, S2, and S3 are configured as follows. First, the first and second support devices Sl and S2 have the same structure, and as shown in FIGS. 3 and 4, they include a rectangular cylindrical fixing bracket 1 fixed to the lower surface of the vehicle body F;
A movable bracket 2 is fixed to the power unit P and has a support shaft 3 fixed to the upper end thereof, which extends in the longitudinal direction of the vehicle through the hollow part of the fixed bracket 1.The support shaft 3 has a rubber or other material on its inner surface. A cylindrical body 5 on which an elastic material 4 is baked is fitted, and the cylindrical body 5 and both side plates 11 and 1r of the fixed bracket 1 are connected via a chevron-shaped elastic support member 6 made of rubber or the like. No. 6 has a relatively low spring constant, that is, a soft spring constant.

Further, on the ground surface of the lower plate 1b of the fixed bracket 1, there is an upper elastic stopper 7 facing the elastic support member 6 with an appropriate gap.
A lower elastic stopper 8 is baked on the lower surface of the lower plate 1b, and a stopper plate 9 fixed to the movable bracket 2 is opposed to it with an appropriate gap. Further, front and rear elastic stoppers 10 and 11 are provided at both the front and rear ends of the lower plate 1b of the fixed bracket 1 in succession to the elastic stoppers 7 and 8, and these are attached to the front and rear side plates 1b of the movable bracket 2.
f and 2t, facing each other with an appropriate gap. In the first and second support devices S, S2, the elastic deformation of the elastic support member 6 in the compression, tension, and shear directions causes longitudinal vibration Y and lateral rotational vibration Zr of the movable bracket 2, that is, the power unit P. and vertical rotational vibration Xr, and the center lower surface of the elastic support member 6 abuts the upper elastic stopper 7 of the fixed bracket 1, and the stopper plate 9 of the movable bracket 2 abuts the lower elastic stopper 8. An excessive increase in the amplitude of the rotational vibration Xr can be suppressed as a buffer, and the front and rear side plates 2f and 2t of the movable bracket 2 abut against the front and rear elastic stoppers 10 and 11, respectively, so that the lateral rotational vibration can be suppressed. An excessive increase in the amplitude of Zr can be suppressed as a buffer.

Next, the third support device S3 includes a rectangular cylindrical fixing bracket 21 fixed to the lower surface of the vehicle body F and a support shaft fixed to the power unit P and extending in the longitudinal direction of the vehicle through the hollow part of the fixing bracket 21 at the upper end. 23 is fixed to the movable bracket 22, and the cylindrical body 2 having an elliptical cross section is attached to the support shaft 23.
4, and the front half of this cylindrical body 24 and the fixing bracket 2
The lower plates 21b of 1 are connected via a chevron-shaped elastic support member 25 made of rubber or the like, and this elastic support member 25 has a spring constant set to be relatively low.

On the outer periphery of the rear half of the cylindrical body 24 are the upper and lower parts of the fixing bracket 21,
Central elastic stoppers 26 are attached to the left and right side plates 21u, 21b, 211, and 21r, respectively, facing each other with appropriate gaps, and front and rear plates of the movable bracket 22 are attached to both front and rear ends of the lower plate 21b of the fixed bracket 21. 22f, 22t
The front and rear elastic stoppers 27 face each other with an appropriate gap between them.
, 28 are provided. In the third support device S3,
Due to the elastic deformation of the elastic support member 25 in the compression, tension, and shear directions, the movable bracket 22, that is, the power unit P
The front and rear side plates 22f and 22t of the movable bracket 22 are in contact with the front and rear elastic stoppers 27 and 28 of the fixed bracket 21, respectively. As a result, the amplitude of the longitudinal vibration Y can be suppressed from increasing excessively, and the central elastic stopper 26 is
By contacting the left and right side plates 211 and 21r of 1,
An excessive increase in the amplitude of the lateral rotational vibration Zr can be suppressed as a buffer, and furthermore, by the central elastic stopper 26 coming into contact with the upper and lower plates 21u and 21b of the fixed bracket 21, the amplitude of the longitudinal rotational vibration Xr can be suppressed. can be used as a buffer to prevent an excessive increase in As described above, according to the present invention, the transmission M is installed on the right or left side of the horizontal multi-cylinder engine E in which the crankshaft C is disposed in the left-right direction of the vehicle, and the transmission M
A power unit P is constructed by sequentially connecting differential devices D to the rear side, and the power unit P is connected to two points located in front of the center of gravity G on the left and right sides of the center of gravity G, and from the center of gravity G. The first and second points, respectively, are located at a point approximately located on a vertical plane in the longitudinal direction of the vehicle, which is rearward and passes through the center of gravity G of the vehicle.
The vehicle body F is supported by the second and third supporting devices Sl, S2, and S3.
Suspended from the lower surface, each of the support devices Sl, S2, S3 includes a fixed bracket 1; 21 fixed to the vehicle body F, movable brackets 2, 22 fixed to the power unit P, and both brackets 1; 2; 21 and 22 are connected, and when longitudinal vibration Y and horizontal and vertical rotational vibrations Zr and Xr about the center of gravity G occur in the power unit P, those vibrations Y and Z
r, Although horizontal rotational vibrations Zr around Y and center of gravity G and longitudinal rotational vibrations Xr around center of gravity G caused by one drive reaction force of drive axes D and d occur, these three types of vibrations Y, Zr, and Xr can all be efficiently absorbed by the three support devices S1 to S3 arranged at three points around the center of gravity G of the power unit, and effectively prevent a decrease in ride comfort of the vehicle due to these vibrations. I can do it.

Furthermore, means for suppressing excessive deformation of the elastic support members 6; 25 due to the horizontal and vertical rotational vibrations Zr and Xr is provided at each of the support devices S1 arranged at three points surrounding the center of gravity G.
~S3 are provided with means for suppressing excessive deformation of the elastic support member 6; 25 due to the longitudinal vibration Y;
Since it is provided in the third support device S3, which is located approximately on a vertical plane in the longitudinal direction of the vehicle passing through the center of gravity G, a relatively small number of deformation suppressing means are used to suppress the vibrations associated with the three types of vibrations Xr, Y, and Zr. 5. Excessive deformation of the elastic support members 6, 25 can be effectively prevented, thus preventing excessive loads from acting on each of the elastic support members 6, 25 and improving their durability. , it is possible to simplify the structure of each of the support devices S1 to S3 and to suppress an increase in cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the device of the present invention, and FIG. 1 is a plan view showing the arrangement of a power unit and its support device, and FIG.
The figure is a side view, and Figures 3 and 4 are the first and second
A vertical side view and a cross-sectional front view of the support device, FIGS. 5 and 6 are a vertical side view and a cross-sectional front view of the third support device. 1...Fixed bracket, 2...Movable bracket, 6...Elastic support member, 7...
・Upper elastic stopper 8...Lower elastic stopper,
10...Front elastic stopper, 11...
Rear elastic stopper, 21... Fixed bracket,
22...Movable bracket, 25...Elastic support member, 26...Central elastic stopper, 27
......Front elastic stopper 28...Rear elastic stopper, c...Crankshaft, D...
・Differential gear, E... Engine, F...
Vehicle body, G... Center of gravity of power unit, M...
...Transmission, P...Power unit, Sl,
S2, S3...First, second, third support device, X
r: Vertical rotational vibration, Y: Front-rear vibration, Zr: Lateral rotational vibration.

Claims (1)

[Claims] 1 A power unit P is constructed by sequentially connecting a transmission M to the right or left side of a horizontal multi-cylinder engine E whose crankshaft c is arranged in the left-right direction of the vehicle, and a differential device D to the rear of the transmission M. and the power unit P is its center of gravity G
at two points located in front of said center of gravity G on the left and right sides of said center of gravity G, and at one point located behind said center of gravity G and approximately located on a vertical plane in the longitudinal direction of the vehicle passing through said center of gravity G, respectively. Third support device S_1, S_2, S_3
The above-mentioned support devices S_1, S are suspended from the lower surface of the vehicle body F by
_2 and S_3 are fixed brackets 1 fixed to the vehicle body F
21, a movable bracket 2 fixed to the power unit P; 22, and both brackets 1, 2; 21, 22
When longitudinal vibration Y and horizontal and vertical rotational vibrations Zr and Xr about the center of gravity G occur in the power unit P, the elasticity has a relatively low spring constant and can absorb the vibrations Y, Zr, and Xr through elastic deformation. The support member 6; 25 and its elastic support member 6; 25 absorb the horizontal and vertical rotational vibrations Z.
r, a deformation suppressing means for suppressing excessive deformation due to Xr, and further, the third support device S_3 suppresses excessive deformation of the elastic support member 6; 25 due to the longitudinal vibration Y. A power unit support device for an automobile, comprising deformation suppressing means.