KR20110052854A

KR20110052854A - Apparatus for preventing drop of bearing pre-load far automobile

Info

Publication number: KR20110052854A
Application number: KR1020090109548A
Authority: KR
Inventors: 김성영
Original assignee: 쌍용자동차 주식회사
Priority date: 2009-11-13
Filing date: 2009-11-13
Publication date: 2011-05-19

Abstract

PURPOSE: An apparatus for preventing the pre-load drop of a bearing for a differential motion device is provided to extend service life of a bearing since pre-load is applied on a bearing inserted into an intermediate carrier. CONSTITUTION: A drive pinion(300) is inserted into a drive pinion shaft(200) inside a differential carrier housing and is rotated. A pair of bearings(400a,400b) is separated from the outer surface of the drive pinion shaft to support the drive pinion shaft inside the differential carrier housing. One end of an intermediate carrier(500) is inserted into one bearing. The other end of the intermediate carrier is inserted into the outer surface of the drive pinion shaft. A first bent part(510) and a second bent part(520) are separated from the intermediate carrier.

Description

Apparatus for preventing drop of bearing pre-load far automobile}

The present invention relates to a bearing preload reduction prevention device of a differential device, and more particularly, even if the bearing is worn out due to long-term use and the gap between the bearings is reduced, the preload is normally applied to the bearing to extend the life of the bearing as well as the bearing clearance. The present invention relates to a preload reduction device for a bearing of a differential device capable of preventing noise and vibrations in advance.

In general, the differential gear is a device that changes the number of revolutions of the inner and outer wheels of the vehicle when the vehicle is turning. That is, when the vehicle is turning, the right wheel should rotate more than the left wheel and drive on a rough road. Even if the driving distance of the inner and outer driving wheels are different.

The differential device of the vehicle is a device that delivers the same size drive torque to the inner and right wheels when the rotational speed of the inner and outer driving wheels is different. In the rotating differential gearbox, the differential pinions are arranged in pairs to face each other so that they can rotate freely.

This configuration causes the wheels to rotate 100rpm on the drive, while in normal driving both wheels will make 100 turns equally. However, if the rotational speed is different, for example, if the right wheel rotates 110, the left wheel rotates oppositely to the 10th and rotates 90 degrees.

Therefore, when one side makes 200 revolutions, the other side becomes zero rotation, and the differential device always distributes the same torque to the inner / outer rings.

Without such a differential, when the car rotates, the inner and outer wheels have different turning radii, so that the rotation is not smooth and the tires wear a lot.

Meanwhile, in order to give a preload to increase the rigidity of the bearing used in the differential device, as shown in FIG. 1, one end is inserted into one bearing 40a and the other end is fitted in close contact with the outer surface of the drive pinion shaft 20. Forming the refracting portion 51 to the 50 to give a preload to the bearings (40a, 40b), which is a number of problems as described in detail as follows.

That is, when the bearings 40a and 40b are used for a long time, they become worn out, and when the gap between the bearings 40a and 40b is increased, the intermediate support member 50 is pulled and the refraction portion 51 is stretched to its original shape. As the preload decreases or disappears at the same time, it is impossible to give an efficient preload to the bearings 40a and 40b, which shortens the life of the bearings 40a and 40b and also causes metallic noise and vibration due to the gap. There was this.

Accordingly, the present invention is to solve such a conventional problem, an object of the present invention is to prevent the bearing preload decrease of the differential device that can extend the life of the bearing by preventing the preload of the bearing even if the bearing is worn and the gap occurs It is for providing a device.

In order to achieve the object of the present invention, the present invention is a bearing preload prevention device of a differential device to prevent the preload is lowered by the vibration caused by driving, the drive pinion is inserted into the drive pinion shaft in the differential carrier housing and; A pair of bearings spaced apart from an outer circumferential surface of the drive pinion shaft to support the drive pinion shaft inside the differential carrier housing; An intermediate support having one end fitted in one bearing and the other end fitted in close contact with the outer circumferential surface of the drive pinion shaft; Characterized in that the first and second refraction of the multi-stage formed to be spaced apart a predetermined interval on the intermediate support so that the gap with the one side bearing.

As described above, the present invention is capable of preloading the bearing even if the bearing is worn out due to long-term use in the differential device, thereby increasing the gap between the bearings, thus extending the life of the bearing and of course preventing noise and vibration caused by the bearing gap. The present invention relates to a bearing preload reduction prevention device of a differential device that can prevent the overload.

Hereinafter, with reference to the accompanying drawings, the technical configuration and operation effects as a preferred embodiment that can effectively achieve the features of the present invention will be described.

3 is a cross-sectional view illustrating main parts of the preloading device according to the present invention, and FIG. 4 illustrates a state in which the preload is applied to the bearing by the second bend when the first bend of the intermediate support is reduced by wear of the bearing in the present invention. One main part is cross section.

The present invention is a bearing preload lowering prevention device of the differential device to prevent the preload is lowered by the vibration caused by driving, the drive pinion is inserted into the drive pinion shaft 200 in the differential carrier housing 100 and rotated 300; A pair of bearings 400a and 400b spaced apart from an outer circumferential surface of the drive pinion shaft 200 to support the drive pinion shaft 200 in the differential carrier housing 100; One end is fitted to one side of the bearing (400a), the other end is the intermediate support body 500 is fitted in close contact with the outer peripheral surface of the drive pinion shaft 200;

The first refraction portion 510 and the second refraction portion 520 of the multi-stage formed to be spaced apart by a predetermined interval on the intermediate support 500 so as to have a difference in the distance between the one bearing (400a).

The present invention is a pair of bearings (400a, 400b) on the outer circumferential surface of the drive pinion 300 and the drive pinion shaft 200 is inserted into the drive pinion shaft 200 in the differential carrier housing (100) After installation, one end is fitted to one bearing 400a, and the other end is formed to bend the intermediate support 500 fitted to the outer circumferential surface of the drive pinion shaft 200, so that the preload is applied to the bearings 400a and 400b. Same as

However, in the present invention, the refraction portion formed in the intermediate support member 500 is formed in the same manner as the first refraction portion 510 and the second refraction portion 520 so that the first refraction portion 510 is reduced even if the second refraction is returned to its original state. The preload is normally applied to the bearings 400a and 400b by the unit 520.

That is, the present invention forms the first refractive portion 510 and the second refractive portion 520 in the intermediate support 500, as shown in FIG. The refraction portion 520 maintains the curved state, and the preload is normally applied to the bearings 400a and 400b due to the force of the deformation of the first refraction portion 510.

As such, when the preload is normally performed by the first refraction portion 510, and the bearings 400a and 400b are worn out for a long time, the gap between the bearings 400a and 400b increases and the first refraction portion 510 becomes the original. When it is reduced to the state, that is, when the intermediate support member 500 is straightened and the preload is not made, the second refraction portion 520 continues to give the preload to the bearings 400a and 400b as the gap increases. do.

Therefore, when the gap occurs due to the wear of the bearings 400a and 400b, the preload is reduced or eliminated as before, thereby extending the life of the bearings 400a and 400b as well as effectively reducing the noise and vibration caused by the gap. I can give it.

Here, it is preferable that the refractive portions formed on the intermediate support 500 are formed in two or more stages.

In addition, the first refraction portion 510 and the second refraction portion 520 of the multi-stages formed on the intermediate support 500 have a larger outer diameter as the distance from the one-side bearing 400a increases. The refractive portion 510 and the second refractive portion 520 preferably have different protruding outer diameters.

Figure 1 is a sectional view of the main part showing a bearing preloading device of a conventional differential device.

Figure 2 is a sectional view of the main portion showing a state where the bent portion of the intermediate support is reduced to its original state by the wear of the conventional bearing.

3 is a sectional view showing the main parts of a bearing preloading apparatus according to the present invention;

Figure 4 is a main sectional view showing a state in which the preload is made to the bearing by the second bend when the first bend of the intermediate support is reduced by the wear of the bearing in the present invention.

Explanation of symbols for main parts of drawing

100: Difference carrier housing 200: Drive pinion shaft

300: drive pinion 400a, 400b: bearing

500: intermediate support 510,520: first and second refracting portion

Claims

In the bearing preload lowering prevention device of the differential device to prevent the preload is lowered by the vibration caused by driving the vehicle,

A drive pinion 300 which is inserted into the drive pinion shaft 200 and rotates in the differential carrier housing 100;

A pair of bearings 400a and 400b spaced apart from an outer circumferential surface of the drive pinion shaft 200 to support the drive pinion shaft 200 in the differential carrier housing 100;

One end is fitted to one side bearing (400a), the other end is the intermediate support member 500 is fitted in close contact with the outer peripheral surface of the drive pinion shaft (200);

First and second refraction portions 510 and 520 formed in a plurality of stages spaced apart from the intermediate support member 500 so as to be spaced apart from the one side bearing 400a;

Bearing preload reduction device of the differential device, characterized in that consisting of.

The method of claim 1,

The multi-stage refractors formed on the intermediate support 500,

A device for preventing preload reduction of a differential device, characterized in that formed in two or more stages.

The method according to claim 1 or 2,

The multi-stage first refractive portion 510 and the second refractive portion 520 formed on the intermediate support 500 are

The bearing preload lowering prevention device of the differential device, characterized in that the outer diameter is formed larger as the distance from the one side bearing (400a).

The method according to claim 1 or 2,

Bearing preload lowering prevention device of the differential device, characterized in that the protruding outer diameter is formed differently.