JPS6359883B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear two-point mount device for attaching a power unit of an automobile to a vehicle body.

A conventional rear two-point device is shown in FIG. (NISSAN Service Bulletin No. 424, page 59,
2 is the rear mount member connected to the vehicle body, and the rear mount member 2
Anti-vibration rubber 3, which is an elastic body, is installed on each of the left and right sides in the vehicle width direction.
and substrates 11, 1 fixed on both sides of the vibration isolating rubber 3.
2 and a bracket 4 welded to the substrate 12 are arranged and fixed, and the power unit 1 is fixed to the bracket 4.

Such a rear two-point mount device 10 can absorb the static load and vibration of the power unit 1 through both compression and shear deformation of the vibration isolating rubber 3, and can also reduce the distance between the rear mount member 2 and the power unit 1. Although there is an advantage that the ground clearance of the rear mount member 2 can be increased, since the mounting device is provided on the upper surface 13 of the rear mount member 2, the bracket 4 and the mounting device 10 protrude in the vehicle width direction. Therefore, the attachment position of the rear mount member 2 to the vehicle body has to be in an outer part with low rigidity rather than the tunnel part where the rigidity of the vehicle body is high. Therefore, there was a problem that the effect of blocking the vibration energy of the power unit 1 was reduced.

Furthermore, the power plant support device of Utility Model Publication No. 54-39776, which was previously proposed by the applicant, connects the flange of the rear extension R and the outer frame 3 with vertical bolts. Because of this, especially when a large longitudinal force is applied,
There is a risk of the bolt breaking.

This support method also allows the power plant to be mounted on the rear two
When supporting at a point, protrude flanges for bolt connection on both the left and right sides of the power plant, which are the supporting parts of the power plant, and
The connecting member with the power plant attached to the rear mount member connected to the vehicle body is also provided with a flange portion that connects to the flange portion, and since these flange portions are joined and bolted together, extra space is required. do. Therefore, the position near the bending resonance node is advantageous for vibration isolation of the power plant.
That is, when trying to support the rear extension R at two points in the front part in Fig. 1 of the above-mentioned Utility Model Publication No. 54-39776, the flange part with the rear mount member attached below the front part of the rear extension R, which has a low ground clearance, must be supported at two points. This method of supporting the power unit at two points at the rear is impractical because it requires space for the bolts to be fixed to the vehicle body, which lowers the ground clearance.

The present invention has been made by focusing on these conventional problems, and it prevents the bolts connecting to the power unit side from breaking, and also makes the connection structure at two points between the power unit and the rear mount member simple and compact. By making it possible to support the mount member on the highly rigid part of the floor tunnel, and by making it possible to connect the mount member further forward than in the past, the ground clearance of the rear mount member can be maintained high. At the same time, it is intended to enable support at the bending resonance node of the power unit, which is advantageous in terms of vibration isolation.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 4.

In the figure, 1 is a power unit, 6 is a floor panel of the vehicle body, 6a is a tunnel portion thereof, and 7 is a rear engine mount bracket welded to the lower surface of the floor panel 6.

In this embodiment, a rear mount member 8 for supporting the rear of the power unit 1 is attached to the rear engine mount bracket 7 with bolts 9 and nuts 10, and bolts 12 are provided at the upper portions of both left and right sides of the rear mount member 8. A channel-shaped inner member 11 is fitted and fixed to the rear mount member 8 with bolts 12 and nuts 13. Anti-vibration rubber 14, which is an elastic body, is provided protruding from the vertical wall 11a of the inner member 11 along the vertical wall 8a of the rear mount member 8 toward the front and rear of the vehicle, and the tip of each of the vibration-isolating rubber 14 is attached to the rear mount member 8. A U-shaped channel-shaped bracket 16 is fixed to this receiving member 15, and the bracket 16 is attached to both sides of the power unit 1. The bracket 16 and the flange 1a are fixed by bolts 17 and nuts 18.

Next, the operation of the rear two-point mount device 200 configured as described above will be explained.

As mentioned above, the anti-vibration rubber 14 is arranged so as to sandwich the rear mount member 8 in the front-rear direction of the vehicle by utilizing the space of the vertical wall of the rear mount member 8, and to provide vertical input to the power unit 1. On the other hand, since the shape is such that it is received by shearing, the space between the power unit 1 and the rear mount member 8 for arranging the vibration isolating rubber 14 can be small, and it also exhibits a sufficient vibration isolating function. It is also possible to secure a spring constant for this purpose. Therefore, the rear mount member 8 supporting the vibration isolating rubber 14
The mounting position on the vehicle body (floor panel 6 and bracket 7) is also the tunnel part 6 of the floor panel 6.
Since the portion near point a can be made highly rigid, vibrations of the power unit 1 can be effectively blocked.

As explained above, since the elastic body is disposed between the vertical wall of the rear mount member and the power unit side member facing the vertical wall of the rear mount member, the ground clearance of the rear mount member can be maintained high. The mounting position of the rear mount member on the vehicle floor panel can now be placed in a highly rigid part of the floor panel near the tunnel section, which has the effect of effectively blocking vibration energy from the power unit system. It will be done.

Further, in the present invention, since the bracket 16 is fitted into the flange portions 1a protruding from both sides of the power unit 1 and fixed by bolts 17 and nuts 18 oriented in the longitudinal direction of the vehicle, Even if force is applied, the bolt 17
According to the present invention, since no shear force acts on
Breaking of the bolt due to shearing can be prevented.

Furthermore, by making the two-point connection structure between the power unit 1 and the rear mount member 8 simpler and more compact than the aforementioned bolt connection method having a flange portion, the connection position of the power unit 1 to the vehicle body can be changed from the conventional one. This makes it possible to maintain the height of the rear mount member 8 from the ground and support the power unit near the bending resonance node of the power unit, which is advantageous in terms of vibration isolation.

[Brief explanation of the drawing]

FIG. 1 is a rear view of a conventional rear two-point mount, FIG. 2 is a rear view of a rear two-point mount device to which an embodiment of the present invention is applied, FIG. The figure is a side view of a power unit equipped with a rear mount device according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Power unit, 6... Floor panel (body), 6a... Tunnel section, 7... Rear engine mount bracket, 8... Rear mount member, 11... Inner member, 14... Anti-vibration rubber (elastic body), 15...receiving member (power unit side member), 16...bracket.

Claims (1)

[Claims] 1 Attach the rear mount member 8 for rear support of the power unit 1 to the rear engine mount bracket 7.
A channel-shaped inner member 11 is fitted and fixed to the upper part of the left and right sides of this rear mount member 8, and anti-vibration rubber 1 is installed in the longitudinal direction of the vehicle from the vertical wall 11a of this inner member 11.
4 are provided protrudingly, encasing these anti-vibration rubbers 14, and a C-shaped channel-shaped receiving member 15 fixed to each end surface of the anti-vibration rubber 14 is provided.
A channel-shaped bracket 16 is fixed, and the bracket 16 is fitted into the flanges 1a protruding from both sides of the power unit 1, and fixed by bolts 17 and nuts 18 oriented in the longitudinal direction of the vehicle. Features a two-point rear mount device for the power unit.