JPH0558402U - Axle housing structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an axle housing structure that can improve assembly workability and reduce repair costs. [Structure] When the axle shaft 8 is assembled or broken, the axle shaft 8 is attached to the inner peripheral surface of the axle housing 7 on the tip side of the oil seal sliding portion 7 of the axle housing 7.
The protrusion 16 which can prevent contact with b is provided.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an axle housing structure for a large vehicle or the like.

[0002]

[Prior Art]

 For large vehicles, a so-called all-floating drive axle is often used, in which the vehicle body weight is received by the axle tube (axle housing) and the drive moment is received by the axle (axle shaft). In such an all-floating drive axle, the vehicle body weight is transmitted from the axle housing via a bearing to a wheel hub that is integrally connected to the axle shaft, and the weight is transmitted from the wheel hub to the tire side. The bearing between the axle housing and the wheel hub is sufficiently supplied with lubricating grease, etc. and the oil seal prevents the grease from flowing out.

The structure of such an all-floating drive axle is as follows. That is, as shown in FIG. 4, the bearing outer race 1 of the unit bearing to which the wheel hub 3 is attached is fixed to the end face portion (flange portion) 8a of the axle shaft 8 at the side end portion thereof by bolts 9 or the like to be integrated. It is designed to rotate.

On the other hand, the bearing inner race 6 of the unit bearing is fixed to the axle housing 7, and the roller 2 is interposed between the bearing inner race 6 and the bearing outer race 1.

As shown in FIG. 3, the cylindrical flange portion 5a of the oil seal 5 is fitted to the end portion of the bearing outer race 1 integrated with the wheel hub 3, while the oil seal 5 The lip portion 5b is closely fitted to the outer periphery of the front end of the axle housing.

Therefore, the load applied from the wheel hub 3 is supported by the axle housing 7 through the unit bearing composed of the bearing outer race 1, the bearing inner race 6 and the roller 2 to drive the wheel hub 3. Is transmitted from the axle shaft 8. On the other hand, the oil seal 5 separates and holds the grease in the bearing portion and the lubricating oil in the axle housing 7.

In FIG. 4, 4 is a brake drum, 10 is a tire, 11 is a rim, and 12 is a differential housing.

[0008]

[Problems to be solved by the device]

 By the way, since the oil seal sliding surface is provided on the outer periphery of the tip end portion of the axle housing 7, the thickness is thin and the structure is easily deformed.

Therefore, at the time of assembly, when the axle shaft 8 is pushed into the axle housing 7 by placing it on the inner peripheral surface thereof, there is a risk that it may interfere with the tip end portion of the axle housing 7 and deform it. There was a difficulty in workability.

Further, even if the axle shaft 8 is damaged at the root of the flange 8a due to an excessive input of the drive line, the axle housing 7 will be deformed due to the interference with the axle shaft 8, and in such a case. Had to replace the entire housing in addition to the shaft, resulting in high repair costs.

Therefore, an object of the present invention is to provide an axle housing structure capable of improving the workability of assembling and reducing the repair cost.

[0012]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the structure of the present invention is, in an all-floating drive axle having an oil seal sliding portion at the tip of the axle housing fitted to the axle shaft, at the tip side of the axle housing. The inner peripheral surface is provided with a projection capable of supporting the axle shaft so as not to contact the oil seal sliding portion.

[0013]

[Action]

 According to the above configuration, it is possible to prevent the axle shaft from interfering with the tip end portion of the axle housing during assembly or breakage of the axle shaft.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of a main part of an all-floating drive axle according to the present invention, and FIG. 2 is an enlarged view of the main part. 1 and 2, the same members and parts as those in FIGS. 3 and 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown, the wheel hub 3 is integrally molded so as to include a portion corresponding to the bearing outer race 1 of FIGS. 3 and 4, and has a size corresponding to the bearing inner race 6 formed therein. A pair of left and right bearing outer races 1 are positioned for fitting.

The bearing inner race 6 is fitted to the outer periphery of a small outer diameter portion 7 a formed near the end portion of the axle housing 7 so as to correspond to the bearing outer race 1. Reference numeral 15 in the figure denotes a bearing retainer screwed onto the outer periphery of the small outer diameter portion 7a.

A protrusion 16 is formed on the inner peripheral surface of the axle housing 7 at a position immediately inside the thin oil seal sliding portion 7b at the tip thereof.

The projections 16 may be provided so as to be scattered at three or four places on the circumference, or may be provided continuously over the entire circumference. Further, instead of being integrally formed with the axle housing 7 as in the illustrated example, it may be formed as a separate component and press-fitted and fixed.

Further, the diameter of the tip circle of the protrusion 16 is set to be slightly larger than the outer diameter of the shaft portion of the axle shaft 8.

With this configuration, when the axle shaft 8 is assembled, the projection 16 serves as a guide, and the axle shaft 8 does not interfere with the oil seal sliding portion 7b and the axle housing 7 does not interfere. It is inserted and assembled inside.

Further, even if the root portion of the collar portion 8a of the axle shaft 8 is damaged due to fatigue or excessive input after assembly, the protrusion 16 causes the axle shaft 8 to interfere with the oil seal sliding portion 7b. Is avoided.

In this way, the oil seal sliding portion 7b of the axle housing 7 is prevented from being damaged or deformed when assembled or when the axle shaft is broken.

As a result, the assembling workability is further improved, and when the axle shaft is broken, the axle shaft can be replaced by itself and the repair cost can be reduced.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the gist of the present invention.

[0025]

[Effect of the device]

 As described above, according to the present invention, it is possible to prevent the axle shaft from coming into contact with the oil seal sliding portion of the axle housing when the axle shaft is assembled or broken, on the inner peripheral surface of the axle housing on the tip side. Since the protrusions are provided, assembly workability can be improved and repair costs can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an all-floating drive axle showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a sectional view of a main part of a conventional example.

FIG. 4 is a partially cutaway plan view of the all-floating drive axle.

[Explanation of symbols]

 7 Axle housing 7b Oil seal sliding part 8 Axle shaft 16 Protrusion

Claims (1)

[Scope of utility model registration request] 1. An all-floating drive axle having an oil seal sliding portion at the tip of an axle housing fitted to the axle shaft, wherein the axle shaft is provided on the tip-side inner peripheral surface of the axle housing. An axle housing structure characterized in that a protrusion capable of supporting the seal sliding portion so as not to come into contact with the seal sliding portion is provided.