JP2505106Y2 - Vehicle differential mount structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a vehicle differential mount structure.

[Prior art]

In recent years, as a subframe on the vehicle body side that supports a suspension device for a rear wheel of an automobile, a subframe having a large height and disposed in the vehicle width direction is provided, and various suspension device links are provided on the subframe. A high-rigidity power plant frame that connects the members together with the differential device to this subframe and connects the power plant consisting of the engine and the transmission and the differential device is provided in the front-rear direction, and thereby the power transmission Vehicles having improved responsiveness and enhanced absorption of vibrations transmitted from the drive system to the vehicle body have been put into practical use.

In the mounting structure for supporting the differential device of the automobile on the subframe, the differential device is provided with an arm member having a substantially gate shape in plan view, and a portion of the front side surface of the subframe corresponding to a pair of rear end portions of the arm members. It is conceivable to provide a pair of brackets to the bracket and connect the arm member to the bracket so as to swing the bracket to support the differential device on the subframe.

Further, a locking portion is formed in a portion of the subframe corresponding to the rear end portion of the differential device, and when the vehicle collides head-on, the differential device which is pushed rearward by the power plant frame forms a bracket. By swinging forward and downward around the connecting part to absorb the displacement of the backward movement, and when the displacement of the backward movement is large, the rear end of the differential device is received by the locking part of the subframe, so that the differential device is It can be considered to prevent a collision with a fuel tank arranged behind the subframe.

[Problems to be solved by the device]

In the mounting structure of the differential device described above, since the subframe must be provided with the engaging portion, there is a problem that the subframe becomes large and the degree of freedom in design is reduced.

In addition, when a vehicle hits hard and hits a large load on the arm member via the power plant frame, the arm member breaks, the differential device is no longer supported, and it is pushed backward depending on the broken part. If the differential device is not received by the locking part of the subframe, there is no possibility that it will retreat close to the fuel tank side and damage the fuel tank, and it is assumed that such a case may occur. There is a problem that it is better to improve safety further.

An object of the present invention is to provide a differential mount structure for a vehicle, which has a high degree of freedom in design, can be applied to various types of subframes, and can further improve safety in a head-on collision.

[Means for solving the problem]

A vehicle differential mounting structure according to the present invention includes a sub-frame disposed in the vehicle width direction, a differential device disposed in front of the sub-frame, and a sub-frame supporting the differential device. In a vehicle differential mount structure including an arm member, a front end portion of the arm member is fixed to a differential device, and a rear end portion of the arm member is pivotally attached to a bracket attached to a front side surface of the subframe. In the vicinity of the rear end of the arm member, a fragile portion having lower strength than other portions is formed.

[Action]

In the vehicle differential mount structure according to the present invention, basically, when a large load is applied to the differential device at the time of a head-on collision of the vehicle, the differential device basically rotates downward about the pivotal portion of the arm member. Absorbs impact and rearward displacement. However, even if a large load acts and the arm member breaks, the vicinity of the rear end of the arm member fixed to the differential device is formed as a weakened portion having lower strength than other portions. The arm member is broken at its fragile portion, and the front portion of the broken portion of the arm member is received by the bracket or the subframe, so that the differential device is reliably prevented from moving rearward, and safety is further improved. I can.

In this way, the differential device reliably prevents the rearward movement by the arm member and the sub-frame, so that the locking portion of the sub-frame can be omitted and the size of the sub-frame can be reduced.
The weight can be reduced and the degree of freedom in design can be increased.

[Effect of device]

According to the vehicle differential mount structure of the present invention, as described in the above section [Operation], the size and weight of the sub-frame can be reduced by the relatively simple differential mount structure. It is possible to increase the degree of freedom and further enhance the safety in the event of a vehicle collision.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The differential mounting structure of the present embodiment is one in which the present invention is applied to the mounting structure of the differential device 30 of the automobile C having the double wishbon type suspension device 10 as shown in FIG.

First, the suspension device 10 will be briefly described. On the vehicle body side of the automobile C, left and right rear frames 1 (see FIG. 2) and a subframe 20 arranged in the vehicle width direction are provided. Reference numeral 10 denotes an upper control arm 11 having a substantially A shape in a plan view pivotably attached to a wheel support member 4 that supports a subframe 20, a rear frame 1, and a rear wheel 3, a wheel support member 4, and a rear frame 1. A first lateral link 12 pivotally supported by the wheel support member 4 and a second lateral link 13 pivotally supported by the sub-frame 20;
The trailing link 14 is pivotally supported at one end by the second lateral link 13, the auxiliary link 15 is pivotally supported at one end by the sub-frame 20, the shock absorber 16 and the like. The other end is swingably connected via a bracket. Reference numeral 2 is a drive shaft, reference numeral 7 is a propeller shaft, reference numeral 8 is a fuel tank disposed on the rear side of the subframe 20, and reference numeral 9 is a highly rigid structure that integrally connects the engine unit and the differential device 30. By connecting the engine unit and the differential device 30 with the power plant frame 9, power transmission response and absorption of vibration generated in the drive system are enhanced.

Next, the mounting structure of the differential device 30 will be described with reference to FIGS.

The sub-frame 20 is composed of a front wall member 20a forming a front wall portion and a rear wall member 20b forming a rear edge portion. The sub frame 20 is joined to each other at an upper end portion and a lower end portion excluding left and right end portions thereof to form a closed cross section. The front wall member 20a and the rear wall member 20b are opposed to each other at left and right ends at predetermined intervals in the front-rear direction and are connected by a reinforcing plate member 21, and the front wall member 20a and the rear wall member are connected to each other. Upper control arms are provided on the upper and lower sides of both left and right ends of 20b.
A bracket 22 for pivotally supporting one end of 11 and a bracket 23 for pivotally supporting the second lateral link 13 are provided.

Bracket mounting portions 24 are formed to be recessed on the rear wall member 20b side, respectively, at portions of the front wall member 20a that are closer to the vehicle body center than the left and right ends, and each bracket mounting portion 24 has a U-shape in plan view. Type bracket 25 is fixed to the rear wall portion 25a, pin insertion holes 25c are formed in the left and right side wall portions 25b of the bracket 25, and the left and right bracket mounting portions 2 of the front wall member 20a are formed.
In the portion between the four, a locking portion 26 is formed in a curved shape rearward so as to correspond to the rear end portion of the differential device 30.

On the other hand, the upper end surface of the housing 31 of the differential device 30 is provided with an arm member 40 for attaching the differential device 30 to the subframe 20. That is, the arm member 40 includes a mounting portion 41, a pair of left and right arm portions 42, and a cylindrical portion 46 provided at the rear end of each arm portion 42, and the arm member 40 is a mounting portion 41 and four bolts 41a for housing. 31
It is fixed to.

The left and right arm portions 42 are formed so as to correspond to the left and right brackets 25, respectively, and each arm portion 42 has a first arm 44 and a mounting portion 41 which are curved and extend rearward from a rear end portion of a side portion of the mounting portion 41. The second arm 45 extends backward from the front end of the side portion of the first arm 44, and the first arm 44 and the second arm 45 are horizontally and at the same height level at the rear end side portion,
A cylindrical portion 46 is provided by being joined to the rear ends of the first arm 44 and the second arm 45.

The cylindrical portion 46 has a cylindrical member 47 fixed to the rear ends of the first arm 44 and the second arm 45, and a rubber bush 48 internally fitted and adhered to the cylindrical member 47 with a pin insertion hole 48a. Has been done. The rear ends of the first arm 44 and the second arm 45 are joined to the upper end of the cylindrical member 47.

When the differential device 30 is mounted on the sub-frame 20, the left and right cylindrical portions 46 of the arm member 40 are engaged with the left and right brackets 25, respectively, and then the pin member 49 is inserted into the pin insertion holes 25c and 48a. The differential device 30 is swingably supported by the subframe 20.

Further, since the first arm 44 and the second arm 45 are formed so that their cross-sectional areas become gradually smaller toward the rear and are joined to the cylindrical member 47 with a relatively small area, the first arm 44 and the second arm 45 are The vicinity of the rear end of the two arms 45 forms a fragile portion 50 having a lower strength than other portions against a large load acting on the arm 42 from the front.

The operation of the mount structure of the differential device 30 as described above will be described.

When the car C collides head-on, the power plant frame 9
And the left and right arm portions 42 via the differential device 30.
When a large load is applied to the left and right arms 42, the left and right arms 42 are broken by weaker parts 50 having lower strength than the other parts, and the weak parts 50 of the arm 42 are broken.
Since the front portion rides on the upper side of the cylindrical portion 46 and hits against the bracket 25 to be received, the differential device 30 is prevented from moving rearward from the subframe 20.

As described above, the fragile portion 50 is formed near the rear end of the arm member 40.
When the vehicle C is head-on, the rearward movement of the differential device 30 is prevented, and the differential device 30 and the fuel tank 8 are prevented from coming into contact with each other or the fuel tank 8 is damaged. Car C
The safety of can be further improved. Further, the rearward movement of the differential device 30 can be reliably prevented by the arm member 40, so that the locking portion 26 of the subframe 20 can be made smaller or omitted, and the subframe 20 is small and lightweight. The degree of freedom in design can be increased.

The fragile portion 50 may be formed by providing a notch near the rear end of the arm member 40.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a rear perspective view of an automobile, FIG. 2 is a plan view of a differential mount structure, and FIG. 3 is a line III-III in FIG. FIG. C: automobile, 20 ... subframe, 20a ... front wall member, 25 ... bracket, 30 ... differential device,
44 …… First arm, 45 …… Second arm, 50 …… Fragile part.

Claims (1)

(57) [Scope of utility model registration request] 1. A subframe provided in the vehicle width direction, a differential device provided in front of the subframe with respect to the vehicle body, and an arm member for supporting the differential device on the subframe. In a vehicle differential mounting structure, a front end portion of the arm member is fixed to a differential device, and a rear end portion of the arm member is pivotally attached to a bracket attached to a front side surface of the subframe. A vehicle differential mounting structure characterized in that a weak portion having a lower strength than other portions is formed in the vicinity of the portion.