JPH0624263Y2 - Front differential gear mounting system for four-wheel drive vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a front differential mount device for a four-wheel drive vehicle such as a one-box car.

(Prior Art) With the widespread use of one-box four-wheel drive vehicles, the output of engines and the size of tires are increasing. Therefore, the input applied to the underbody of the vehicle is increased by 20 to 30% as compared with the conventional vehicle. Therefore, there is no problem during normal running, but the vertical displacement of the front differential becomes large during sudden start and acceleration. Therefore, the front differential may be damaged, such as the inner shaft coming off.

This is because an insulator with a low spring constant is used as a diff mount mechanism to prevent vibration transmission during normal running and absorbs vibration.Therefore, increase the spring constant of the insulator as a means to regulate the displacement of the differential. Is also considered. However, when the spring constant of the insulator is increased, there is a problem that vibration transmission becomes remarkable, the riding comfort is deteriorated, and noise is caused.

(Problems to be Solved by the Invention) As described above, the conventional front differential device has a problem that it is not possible to both reduce vibration transmission and regulate vertical displacement of the differential.

This invention is a front differential device for a four-wheel drive vehicle that has a simple structure but prevents vibration transmission by a mount with a low spring constant during normal traveling, and can restrict displacement of the front differential during sudden start and acceleration. To provide.

[Constitution of device]

(Means and Actions for Solving Problems) In this invention, a plurality of connecting arms extending in the front-rear direction of the vehicle body are fixed to a front differential, and the connecting arms are elastically attached to a cross member installed between side members. In a front differential mounting device for a four-wheel drive vehicle configured to be supported via a connecting portion, the cross member is arranged so as to intersect below a portion of the differential that extends in the vehicle body front-rear direction, and the cross member is provided. A diff stopper having both ends fixed to the upper portion of the member and surrounding the portion of the cross member in a space is provided, and one of the connecting arms is supported by the diff stopper via the elastic connecting portion. Is characterized by.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

1 to 4, 1 and 1 are side members, and 2 and 3 are suspension cross members. Both ends of the suspension cross members 2 and 3 are installed between the side members 1 and 1. A front differential, hereinafter simply referred to as a differential 4, is provided between the suspension cross members 2 and 3. The differential 4 is composed of a main body 5 having a gear mechanism incorporated therein, an outer pipe 6 and an inner pipe 7 protruding left and right from the main body 5, and a propeller shaft 8 extending to the rear side of the vehicle body. The differential 4 is elastically supported by the suspension cross members 2 and 3 by the first to third differential mount mechanisms 9 to 11.

First, the first differential mount mechanism 9 will be described.
Reference numeral 12 denotes a U-shaped bracket fixed to the suspension cross member 2, and a support shaft 13 is provided on the bracket 12, and the support shaft 13 has an insulator 1 attached thereto.
One end of the connecting arm 16 is connected via 5. The insulator 15 includes an inner pipe 17, an outer pipe 18, and a vent hole 1 filled between the pipes 17 and 18.
The elastic connecting portion 2 is formed by the rubber 19 having 9a and 19a.
0 is configured. The support shaft 13 is inserted into the inner pipe 17, and the connecting arm 16 is fixed to the outer pipe 18. The tip of the connecting arm 16 is welded and fixed to the outer pipe 6 of the differential 4.

The second diff mount mechanism 10 has basically the same structure as the first diff mount mechanism 9 and includes the connecting arm 21.
One end of is connected to the end of the outer pipe 6 of the differential 4 by bolts and nuts 22 ... The other end of the connecting arm 21 is connected to the suspension cross member 3 via an elastic connecting portion 20 that has basically the same structure as the first differential mount mechanism 9.

Further, the differential 4 that intersects with the suspension cross member 3 is located above the suspension cross member 3 and is separated therefrom.
The suspension cross member 3 opposed to is provided with a differential stopper 23 surrounding the differential 4. The differential stopper 23 is formed by bending a metal plate material in an inverted U shape and has mounting portions 24, 24 at both ends thereof. The mounting portions 24, 24 are fixed to the mounting bases 25, 25 fixed to the suspension cross member 3 by welding with bolts 26, 26. And
A stopper rubber 27 is attached to the inner surface of the curved surface of the differential stopper 23. The stopper rubber 27 normally faces the differential 4 while being spaced apart from it, and suddenly starts moving.
When the differential 4 is displaced in the vertical direction during acceleration, it comes into contact with the stopper rubber 27 of the differential stopper 23 to regulate the displacement of the differential 4. A third differential mount mechanism 11 is provided between the differential stopper 23 thus configured and the outer pipe 6 of the differential 4.

The third differential mount mechanism 11 has basically the same structure as the second differential mount mechanism 10, and one end of the connecting arm 28 is connected to the outer pipe 6 of the differential 4 by a bolt nut 29. The other end of the connecting arm 28 is connected to the suspension cross member 3 via an elastic connecting portion 30 having the same basic structure as the first differential mount mechanism 9. That is, the bracket 31 is fixed to a part of the differential stopper 23, and the bracket 31 is provided with the support shaft 32 that is inserted into the inner pipe 17 that constitutes the elastic connecting portion 30.

Therefore, the differential 4 is elastically supported by the suspension cross members 2 and 3 by the first to third differential mount mechanisms 9 to 11, and the vertical displacement of the differential 4 is restricted by the differential stopper 23. Therefore, during normal traveling, vibration can be absorbed by the insulators 15 of the first to third differential mount mechanisms 9 to 11 having low spring constants, and the transmission of vibration to the vehicle body can be absorbed.
Further, when the differential 4 is displaced in the vertical direction at the time of sudden start and acceleration, the differential 4 moves to the differential stopper 23.
The stopper rubber 27 provided on the inner surface of the member collides with the stopper rubber 27 and its displacement is restricted. At this time, the differential 4 is made of metal, but since the inner surface of the differential stopper 23 is the stopper rubber 27 made of rubber, it is possible to avoid collision between the metals and to absorb the impact at the time of collision.

[Effect of device]

As described above, according to the present invention, since the front differential is supported by the cross member through the plurality of connecting arms and the elastic connecting portions fixed to the differential, the delicate vibration of the differential is elastically connected. It is absorbed by the section and effectively blocks the transmission to the cross member. Further, since the differential stopper that surrounds the portion of the differential that extends in the vehicle front-rear direction with a space is provided, even if this portion of the front differential is displaced in the vertical direction by the drive reaction force, the differential stopper is also provided. Therefore, the displacement can be surely suppressed. As a result, each elastic connecting portion can bear the static load of the front differential and can absorb the delicate vibration.

Moreover, since one of the connecting arms that supports the front differential is supported by the differential stopper via the elastic connecting portion, it is necessary to specially provide the cross member itself with a member for supporting the elastic connecting portion on the cross member. This is extremely advantageous in terms of space and is extremely useful in front differentials where the engine and transmission are in the vicinity, and also eliminates the step of attaching a bracket to a large cross member, reducing manufacturing costs. There is also an effect that can be done.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a plan view of a front differential mounting device, FIG. 2 is a plan view of a main portion of FIG. 1, and FIG. 3 is III-III of FIG. FIG. 4 is a sectional view taken along the line, and FIG. 4 is a sectional view of the elastic connecting portion of the differential mount mechanism. 1 ... Side member, 2, 3 ... Suspension cross member, 16, 21, 28 ... Connecting arm, 20, 30 ...
Elastic connection part, 4 ... Differential, 23 ... Differential stopper, 27 ... Stopper rubber.

Claims (1)

[Scope of utility model registration request] 1. A front differential is fixed to a plurality of connecting arms extending in the front-rear direction of a vehicle body, and each connecting arm is supported by a cross member installed between side members via elastic connecting portions. In the front differential mounting device for a four-wheel drive vehicle, the cross member is arranged so as to intersect below a portion of the differential that extends in the vehicle body front-rear direction, and both ends are fixed to an upper portion of the cross member. A front differential of a four-wheel drive vehicle, comprising a diff stopper that surrounds the portion of the member with a space, and one of the connecting arms is supported by the diff stopper via the elastic connecting portion. apparatus.