JPH0249056Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mounting structure for a differential device installed in a vehicle.

(Conventional technology) Conventionally, FR (front engine, rear drive)
In vehicles such as model cars, a differential device that transmits engine driving force input via a propeller shaft to the left and right rear wheels is supported in a suspended state below the floor at the rear of the vehicle body. A fuel tank is located near the front. In addition, the differential device is
For example, as disclosed in Japanese Utility Model Application Publication No. 59-72125, it is generally supported by the vehicle body via an elastic body in order to prevent the vibrations from being transmitted to the vehicle body.

(Problem that the invention aims to solve) However, in the above-mentioned vehicle, when a rear collision occurs, a collision load acts on the differential gear from the vehicle body, causing the differential gear to move forward and drain the fuel. By colliding with the tank, there is a risk that even the fuel tank may be damaged, causing fuel leakage.

In order to solve this problem, it is desirable to prevent the collision load from acting on the differential device from the vehicle body side during a rear collision, but this is difficult to achieve due to the vehicle body structure.

The present invention has been developed in view of this point, and its purpose is to separate the differential from the vehicle body when a collision load acts on the differential during a rear collision. The purpose is to avoid collision between the differential gear and the fuel tank and prevent damage to the fuel tank.

(Means for Solving the Problem) In order to achieve the above object, the solution of the present invention is such that a differential gear is supported in a suspended state below the floor at the rear of the vehicle body, and fuel is provided near the front of the differential gear. In a vehicle equipped with a tank, the differential is supported on the vehicle body via a connecting member, and the connecting member is used to support the differential when a load of more than a predetermined value is applied to the differential during a rear collision. The structure is such that it is provided so as to release the .

(Function) With the above configuration, in the present invention, when a relatively large collision load acts on the differential during a rear collision, the connecting member that connects and supports the differential to the vehicle body receives this collision load and shifts the differential. By releasing the support of the device and separating the differential from the vehicle body, a collision between the differential and the fuel tank is avoided.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

Figures 1 to 3 are examples of the present invention.
The case is shown in which the present invention is applied to the mounting structure of a differential gear in an FR type automobile, and 1 is a floor panel that constitutes the floor portion of the vehicle body, and a spare tire is stored in the floor panel 1 in a portion facing the trunk room of the vehicle body. A storage section 1a is formed. Reference numeral 2 denotes a side frame extending in the longitudinal direction of the vehicle body, and reference numeral 3 denotes a rear suspension cross member extending in the vehicle width direction near the front of the storage section 1a of the floor panel 1.Both left and right ends of the rear suspension cross member 3 are connected to the side frame 2. Although not shown, a rear suspension component is connected to and supported by this rear suspension cross member 3.

Further, reference numeral 4 denotes a differential device disposed below the rear suspension cross member 3 in a state of being suspended and supported by the rear suspension cross member 3, and the differential device 4 is connected to the rear end of the propeller shaft 5 and It is connected to one end of a pair of left and right rear wheel axle shafts 6, 6, and the engine driving force input via the propeller shaft 5 is transferred to the axle shafts 6, 6.
The power is transmitted more to the left and right rear wheels 7.
Reference numeral 8 denotes a fuel tank disposed below the floor panel 1 and near the front of the differential gear 4, and the bottom center of the fuel tank 8 is curved upward so as not to interfere with the propeller shaft 5. It is formed.

The differential device 4 is elastically supported by the rear suspension cross member 3 at one location at the front and at two locations at the rear. This front side mounting structure includes a mount bushing 10 that is fixed to the upper surface of the differential gear 4 in an upright state by bolts 9, and a mount bushing 10 that is connected to the mount bushing 10 via a support shaft 11 so as to be relatively rotatable. The body mount bracket 14 is fixed to the front side surface of the rear suspension cross member 3 by bolts and overlappingly connected to the mount bush bracket 12. As shown in FIG. 4, the mount bush 10 is constructed by filling and fixing rubber 10c between an outer cylinder 10a and an inner cylinder 10b. The mounting structure on the rear side includes a differential mount bracket 16 extending in the vehicle width direction and having a central portion fixed to the rear surface of the differential gear 4 with bolts 15, and a differential mount bracket 16 provided at both left and right ends of the differential mount bracket 16. mount bushings 17, 17, a mount bushing bracket 19 connected to each mount bushing 17 via a support shaft 18 so as to be relatively rotatable, and a mount bushing bracket 19 fixed to the rear side surface of the rear suspension cross member 3 by welding 20. , and a body mount bracket 21 which is connected to the mount bush bracket 19 in a superposed manner.

As a feature of the present invention, in both the front side and rear side mounting structures, the mount bushing brackets 12, 19 and the body mount brackets 14, 21 are connected in the case of the front side mounting structure. (Mount bush bracket 1
2 and the body mount bracket 14). As shown in FIGS. 5 and 6 in detail, the mount bush bracket 12 has a cutout hole 26 that opens toward the rear of the vehicle body. A slide member 27 having a bolt insertion hole 24 in the center is fitted into the notch hole 26. The slide member 27 and the mount bushing bracket 12 are integrally connected by four resin shear pins 23, 23, . . . . Then, the bolt 22a is inserted into the bolt insertion hole 24 of the slide member 27 and the body mount bracket 1 using a set of bolts and nuts 22.
It is inserted into the circular insertion hole 25 of No. 4 and fastened with a predetermined tightening force. In addition, each of the sear pins 23
is penetrated through the mount bushing bracket 12 and the slide member 27, and is provided so as to restrict the relative displacement of both members in the horizontal direction, and to break when a shear load of a predetermined value or more is applied in the restricting direction. ing. Therefore, mount bush brackets 12 and 19 and body mount bracket 1
4 and 21, the connection between the mount bracket 12 and the slide member 27 is released when a load greater than a predetermined value (a load value at which the shear pin 23 breaks due to shearing) is applied to the differential device 4 in the event of a rear collision. The support of the differential device 4 is released.

Next, to explain the functions and effects of the above embodiment, the storage section 1a of the floor panel 1 will be
When a relatively large collision load is applied to the differential device 4 in the forward direction of the vehicle body, the mount bushing brackets 12 and 19 in the front and rear mounting structures of the differential device 4 and the body mount At the connecting portion with the brackets 14, 21, shear pins 23, 23, which are the connecting members,
... is subjected to the above collision load in the shear direction and breaks,
When the mount bushing brackets 12, 19 and the slide member 27 are uncoupled, and the bolt 22a of the bolt & nut 22 moves forward of the vehicle body, the differential gear 4 or the mount bushing bracket 12, 19 moves forward. 12,19
The mount bushing bracket 12, 1 slips out from the notch opening side of the notch hole 26.
9 and the body mount brackets 14 and 21 are disconnected, the support for the differential gear 4 is released, and the differential gear 4 separates from the vehicle body and falls to the ground. As a result, a collision between the differential gear 4 and the fuel tank 8 located near the front thereof can be avoided, and damage to the fuel tank 8 can be prevented to improve safety.

Here, the magnitude of the load value acting on the differential device 4 when the shear pin 23 breaks, that is, when the support of the differential device 4 is released, is as follows:
It is desirable to approach as close as possible the limit load value at which the differential 4 would collide with the fuel tank 8 if the support of the differential 4 was not released.

(Effects of the invention) As described above, according to the mounting structure of the vehicle differential according to the present invention, when a load of more than a predetermined value is applied to the differential during a rear collision, the differential is connected and supported to the vehicle body. Since the connecting member that is attached to the differential gear will soon release its support and the differential gear will separate from the vehicle body, a collision between the differential gear and the fuel tank located near the front of the differential gear can be avoided, and damage to the fuel tank can be prevented. ,
Safety can be increased.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Figs. 1 to 3 show the mounting structure of a differential gear in an FR type automobile, with Fig. 1 being a plan view, Fig. 2 being a side view, and Fig. 3 being a side view. is an exploded perspective view. Fig. 4 is a vertical side view of the mount bushing, Figs. 5 and 6 show the structure of the connecting part between the mount bushing bracket and the body mount bracket, Fig. 5 is an exploded perspective view, and Fig. 6 is the connected state. FIG. 1... Floor panel, 4... Differential device, 8...
Fuel tank, 22...Bolt & Natsu, 23...
Sear pin, 27...Slide member.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a vehicle in which a differential device is supported in a suspended state below the floor at the rear of the vehicle body, and a fuel tank is disposed near the front of the differential device, is supported by the vehicle body via a connecting member, and the connecting member is provided so as to release support for the differential when a load of more than a predetermined value is applied to the differential during a rear collision. Features a mounting structure for vehicle differentials. (2) The mounting structure for a vehicle differential according to claim 1, wherein the connecting member is a shear pin.