JP4282796B2 - Rear differential support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rear differential support structure that can enhance the safety of a vehicle body at the time of a collision, and more specifically, a rear differential connected to a propeller shaft disposed below a fuel tank at the time of a collision is a vehicle body. The present invention relates to a rear differential support structure devised so that the rear differential and the fuel tank do not interfere with each other so as to move forward and downward.
[0002]
[Prior art]
A conventional rear differential vehicle body mounting structure will be briefly described with reference to the drawings. FIG. 5 is a side view showing a conventional rear differential vehicle body mounting structure, in which 101 has a joint portion 104 at an intermediate portion. A propeller shaft 102 is a rear differential 105 coupled to the rear end portion of the propeller shaft 103, and a fuel tank 103 is disposed above the propeller shaft and at an obliquely upper front portion of the rear differential. The fuel tank 103 is fixed to the vehicle body (not shown) by appropriate fixing means, the propeller shaft 101 is also supported on the vehicle body side by a support member (not shown), and the rear differential 102 also includes two front left and right points (not shown) and the rear. It is supported on the vehicle body side at three points.
[0003]
[Problems to be solved by the invention]
In a vehicle body having a rear differential mounting structure having the above configuration, when the vehicle body collides forward, the propeller shaft is bent downward at the intermediate joint portion 104 as shown by a one-dot chain line in the figure, and the front propeller shaft 101a is placed on the ground. The rear differential coupling portion 105 of the rear propeller shaft 101b is turned upward by the reaction at that time, and the rear differential 102 rotates counterclockwise to the fuel tank 103 side as shown in the drawing and interferes with the fuel tank 103. There is a fear.
[0004]
In addition to the conventional example described in Japanese Patent Laid-Open No. 62-85719, the rear differential is prevented from interfering with the fuel tank when the rear differential moves forward during a rear collision. There is.
As shown in FIG. 6, an inclined portion 106 that is forwardly lowered with respect to the vehicle body is formed on the vehicle body obliquely above and forward of the rear differential 102. When the rear differential 102 moves forward during a rear collision, the differential 102 is moved to the front. It moves obliquely forward and downward by the inclined portion 106 so as not to interfere with the fuel tank 103.
[0005]
However, in this configuration, when the propeller shaft is bent downward at the intermediate joint portion due to a forward collision, the rear differential coupling portion of the rear propeller shaft 101b is caused by the reaction at that time as in the conventional example described above. There is a possibility that the rear differential 102 rotates toward the fuel tank 103 and interferes with the fuel tank 103.
[0006]
Therefore, the present invention provides a rear differential rear support unit coupled to the propeller shaft so that the rear differential connected to the propeller shaft disposed below the fuel tank rotates forward and downward with respect to the vehicle body at the time of a collision. A projecting part (an inclined part that falls forward with respect to the vehicle body) is formed at the top and rear of the vehicle body, and when the vehicle body member that is behind the rear differential hits the inclined part at the time of a collision, a rotational motion that moves forward downward is generated in the rear differential. The object is to solve the above-mentioned problems.
[0007]
According to the present invention, the rear differential is always in front of the vehicle body by the action of the inclined portion formed at the front lower side with respect to the vehicle body at the center of the support portion of the rear differential in both the vehicle body front collision and the rear collision. Since it rotates and moves downward, the possibility that the rear differential rotates toward the fuel tank and interferes with the fuel tank can be almost eliminated.
[0008]
[Means for Solving the Problems]
For this reason, the technical solution means adopted by the present invention is:
In the rear differential of the support structure front ends arranged propeller shaft downward Ru is connected in a fuel tank, a rear end vicinity of the rear differential, and, rearwardly projecting from the support portion to the vehicle body to the rear differential the protruding portion is formed, at the time of collision, by projecting portion comes into contact with the vehicle body member at the back than the rear differential, with the rear differential support structure, characterized in that imparts downward direction moment before the rear differential is there.
Further, the rear differential support structure is characterized in that the projecting portion is provided at a rear support portion of the differential and is formed by an inclined portion that is forwardly lowered with respect to the vehicle body.
Further, the rear differential support structure is characterized in that the forwardly inclined portion is integrally attached to the rear differential.
The rear differential support structure is characterized in that a vehicle body member located behind the rear differential is a muffler.
[0009]
Embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing a vehicle body mounting structure of a rear differential portion according to the first embodiment, FIG. 2 is a side view thereof, FIG. 3 is a side view of an inclined portion formed to be lowered forward with respect to the vehicle body, and FIG. It is a front view of an inclined part.
[0010]
In FIG. 1, 1 is a propeller shaft, 2 is a rear differential coupled to an end portion of the propeller shaft, 3 is a fuel tank mounted on the vehicle body side above the propeller shaft 1 and at an obliquely upper front of the rear differential 2, 5 Is a joint between the rear end portion of the propeller shaft 1 and the rear differential 2, 6 is a rear differential mount bracket fixed to the rear member 9 by appropriate means, 7 is a floor on the vehicle body side, and 8 is a front side of the rear differential. A front member, 9 is a rear member that supports the rear side of the rear differential, 10 is a protruding portion that protrudes upward and rearward of the vehicle body from the rear support portion of the differential, and in this example, an inclined portion formed on the rear differential mount bracket 6, It is a muffler.
[0011]
The propeller shaft 1 is connected to the front propeller shaft 1a and the rear propeller shaft 1b at the central joint portion 4 as in the prior art, and the rear differential 2 is coupled 5 to the end of the rear propeller shaft 1b.
A fuel tank 3 is disposed above the rear propeller shaft 1b and above the front of the rear differential 2, and is attached to the vehicle body by a fixing means (not shown). The fuel tank 3 is interfered with the propeller shaft 1 below. A recess 3a for avoiding is formed.
[0012]
The front side of the rear differential 2 is floatingly supported by the front member 8 at two left and right points 12 via bushes 13, and the rear side of the rear differential 2 is fixed to the rear differential mount bracket 6, and the rear differential mount bracket 6 is a bush 14. The rear member 9 is floatingly supported via Each of the bushes 13 and 14 has a function of reducing transmission of vibration noise to the body.
[0013]
As shown in FIGS. 3 and 4, the rear differential mount bracket 6 has an inclined member 6b, which forms a forwardly inclined portion 10 on the outer periphery of the ring portion 6a to which the bush 14 is fitted, fixed by welding 6c. A mounting hole 6d for coupling the rear differential is formed in the lower front of the. The rear differential mount bracket 6 has a bush 14 fitted to the ring portion 6a, and is fixed to the rear member 9 with a bolt 15 or the like via the bush.
[0014]
The operation of the rear differential mount bracket support structure having the above-described configuration will be described. In the non-collision state, the propeller shaft, the fuel tank, and the rear differential are in the positions shown in FIG. In this state, when the vehicle body collides forward, the propeller shaft bends downward at the central joint portion 4 and the rear differential 2 tends to move toward the fuel tank 3 by the reaction at this time. However, at this time, the muffler 11 attached to the vehicle body side hits the inclined portion 10 of the rear differential mount bracket 6, so that the impact force at this time causes the rear differential mount bracket 2 to center on a bolt 15 as a support portion of the rear differential mount bracket 6. As a result, the rear differential 2 rotates in a counterclockwise direction, and a rotational moment is generated in the rear differential 2 that moves forward and downward as indicated by the arrows in the figure. This causes the rear differential 2 to rotate forward and downward. Interference with the tank 3 can be prevented.
[0015]
In the above example, the member corresponding to the inclined portion 10 formed on the rear differential mount bracket 6 has been described as the muffler 11. However, the member is not necessarily limited to the muffler 11, and moves to the rear differential 2 forward and downward by hitting the inclined portion of the rear differential mount bracket at the time of collision. Other members on the vehicle body side may be used as long as they are members that can generate the force to be applied. Further, the inclined portion 10 may be formed on a member extended from the rear differential side, for example, as long as it can function to move the rear differential forward and downward without being formed on the rear differential mount bracket 6. .
Furthermore, the present invention can be implemented in various other ways without departing from the spirit and essential features.
[0016]
【The invention's effect】
As described above in detail, according to the present invention, the rear differential always acts on the vehicle body by the action of the inclined portion that is formed at the front lower side with respect to the vehicle body at the time of either the vehicle body front collision or the rear vehicle collision. Since it moves forward and downward, the rear differential rotates to the fuel tank side, and it is possible to achieve an excellent effect that it is possible to eliminate a situation where the rear differential interferes with the fuel tank.
[Brief description of the drawings]
FIG. 1 is a plan view showing a vehicle body mounting structure of a rear differential portion according to a first embodiment.
FIG. 2 is a side view of FIG.
FIG. 3 is a side view of a rear differential mount bracket having an inclined portion formed so as to be lowered forward with respect to the vehicle body.
4 is a front view of FIG. 3;
FIG. 5 is a side view showing a conventional rear differential vehicle body mounting structure.
FIG. 6 is a side view showing another conventional rear differential vehicle body mounting structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Propeller shaft 2 Rear differential 3 Fuel tank 4 Central joint part 5 Joint part of propeller shaft and rear differential 6 Rear differential mount bracket 7 Floor 8 Front member 9 Rear member 10 Inclined part 11 Muffler 13, 14 Bush 15 Bolt

Claims (4)

In the rear differential of the support structure front ends arranged propeller shaft downward Ru is connected in a fuel tank, a rear end vicinity of the rear differential, and, rearwardly projecting from the support portion to the vehicle body to the rear differential A rear differential support structure characterized in that a protrusion is formed and, in the event of a collision, the protrusion comes into contact with a vehicle body member located behind the rear differential, thereby applying a moment in a forward downward direction to the rear differential. 2. The rear differential support structure according to claim 1, wherein the protruding portion is provided on a rear support portion of the differential and is formed by an inclined portion that is forwardly lowered with respect to a vehicle body. The rear differential support structure according to claim 2, wherein the forwardly inclined portion is integrally attached to the rear differential. The rear differential support structure according to any one of claims 1 to 3, wherein the vehicle body member located behind the rear differential is a muffler.

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