JPH0418883Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seal structure for a wheel bearing, and particularly to a structure for removing a seal member that seals between an end face of an axle housing and a bearing retainer.

[Conventional technology]

Conventionally, in order to prevent water from entering the wheel bearing from the outside, a recessed part 32 is formed on the end face of an axle housing 31 that holds the outer ring of the wheel bearing 30, as shown in FIG. 32 and the O-ring 33 is fitted to the O-ring 33.
The ring 33 was sealed by crimping the side surface of the ring 33 with a bearing retainer 34.

[The problem that the idea aims to solve]

However, in this case, the back plate 35
O-ring 3 when assembling the bearing retainer 34.
3 easily comes off from the recessed step 32, resulting in poor assembly workability. Moreover, if the O-ring 33 is pinched in a misaligned state, a problem arises in that the desired sealing effect cannot be obtained.

Therefore, the purpose of the present invention is to provide a wheel bearing seal structure that eliminates the O-ring and has a structure in which the seal member does not easily come off from the axle housing, thereby improving assembly workability and sealing performance. be.

[Means to solve the problem]

In order to achieve the above object, the present invention forms a fitting part on the outer periphery of the end face of the axle housing, and a seal member is an annular elastic body sandwiched between the end face of the axle housing and the bearing retainer; An annular metal core is integrally bonded and fixed to the outer periphery of the elastic body, and the core has an L-shaped cross section, and the core has a cylindrical portion having an inner diameter larger than the outer diameter of the fitting portion, and the cylindrical portion. It consists of an end face part bent inward from one end, covered with the elastic body from the end face part to the inner periphery of the cylindrical part, and a fitting part of the axle housing on the part of the elastic body that covers the inner periphery of the cylindrical part. A plurality of axial protrusions are integrally formed to be crimped onto the outer peripheral surface.

[Effect]

When the seal member is fitted to the outer periphery of the fitting portion of the axle housing, since the outer periphery of the protrusion is restrained by the metal core, only the protrusion is compressed and crimped onto the outer periphery of the axle housing. Therefore, once the seal member is press-fitted into the axle housing, there is no fear that it will fall off, and assembly work efficiency is improved. When the bearing retainer is crimped in this state, the seal member is crimped at the proper position between the axle housing and the bearing retainer, and a reliable sealing effect can always be achieved.

In addition, in this invention, since the protrusions of the elastic body are crimped to the mating part, a nearly constant crimping force can be maintained even if there are slight dimensional variations in the inner diameter of the core metal, making it easier to manage the dimensions of the core metal. At the same time, press-fitting work becomes easier.

Furthermore, since the core metal is formed into an L-shaped cross section between the cylindrical part and the end face, the corners of the sealing member are also reinforced with the core metal, and by hitting these corners with a hammer etc., the sealing member can be fitted. It can be easily assembled into the section.

〔Example〕

In Figure 1, 1 is the axle shaft, 2 is the axle housing, 3 is the wheel bearing,
A housing end member 4 is integrally fixed to the end of the axle housing 2, and this housing end member 4 holds the outer ring of the wheel bearing 3. 5 is a brake drum fixed to the end of the axle shaft 1 via a hub bolt 6, 7 is a wheel disk, 8 is a back plate fixed by a mounting bolt 9 on the outer surface of the housing end member 4, and 10 is a back plate. It is fixed integrally with the plate 8,
A bearing retainer 11 which presses and fixes the wheel bearing 3 to the housing end member 4 side is a wheel cylinder attached to the back plate 8.

Between the end face of the housing end member 4 of the axle housing 2 and the bearing retainer 10,
A sealing member 12 shown in FIGS. 2 and 3 is sandwiched therebetween to prevent water from entering the wheel bearing 3. That is, this seal member 12 is
An annular elastic body 13 made of rubber or the like, and this elastic body 1
An annular metal core 2 having a larger diameter than the elastic body 13 is integrally bonded and fixed to the outer periphery of the elastic body 13 by means such as vulcanization adhesion.
It is made of a composite material with 0 and has a generally L-shaped cross section as a whole. The inner diameter of the outer circumferential portion 14 of the elastic body 13 is approximately the same as the outer diameter of the fitting portion 4a of the housing end member 4, and the inner surface of the outer circumferential portion 14 has a semicircular shape as shown in FIG. A plurality of protrusions 15 having an arcuate cross section are provided in the axial direction. A tapered surface 16 is formed at the tip of the protrusion 15 to facilitate press-fitting into the housing end member 4. Further, large and small annular projections 18 and 19 are provided in the circumferential direction on the front and back surfaces of the clamping part 17 that is perpendicular to the outer peripheral part 14, and the clamping part 17 is connected to the end surface of the housing end member 4 and the bearing retainer When sandwiched between the two, a sufficient sealing effect can be obtained.

Therefore, when the outer circumference of this seal member 12 is fitted to the outer circumference of the fitting part 4a of the housing end member 4, the inner diameter of the protrusion 15 is smaller than the outer diameter of the fitting part 4a, so that the elastic body 13 is The outer circumferential portion 14 tries to deform outward, but since the periphery is restrained by the core metal 20, the protrusion 15 is compressed and press-fitted to the outer circumference of the fitting portion 4a, and the sealing member 12 is pressed against the outer circumference of the fitting portion 4a. It is securely prevented from coming off from the end member 4. Therefore, there is no fear that the seal member 12 will come off when assembling the back plate 8 and the bearing retainer 10, improving work efficiency, and the seal member 12 is always held in the correct position between the housing end member 4 and the bearing retainer 10. Therefore, the sealing effect is not impaired.

In addition, although the case where the housing end member 4 was separate from the axle housing 2 was shown in the said Example, it may be integrated. Further, the back plate 8 and the bearing retainer 10 may be integrated.

[Effects of the invention] As is clear from the above explanation, according to the invention, the sealing member is made of a composite material of an elastic body and a metal core, and the outer periphery of the sealing member is connected to the fitting part of the axle housing. By fitting the seal member to the axle housing, the protrusion of the elastic member is pressed against the outer peripheral surface of the fitting portion, so that the seal member is reliably prevented from coming off from the axle housing. Therefore, there is no fear that the seal member will come off or shift when assembling the back plate or bearing retainer, making the assembly work easier, and the seal member can always be held in the correct position.

In addition, since the protrusions of the elastic body are crimped to the mating part, unlike the case where the core itself is press-fitted into the mating part, almost constant crimping can be achieved even if there are slight dimensional variations in the inner diameter of the core. The force can be maintained, the dimensions of the core metal can be easily controlled, and the press-fitting work is also facilitated.

Furthermore, since not only the outer periphery but also the corners of the sealing member are reinforced with the core metal, the sealing member can be easily assembled to the fitting portion by hitting the corners of the sealing member with a hammer or the like.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a wheel portion to which the seal structure according to the present invention is applied, Fig. 2 is a partially enlarged sectional view of the seal member, Fig. 3 is a partial view taken in the direction A of Fig. 2; The figure is a partial sectional view of a conventional example. 2... Axle housing, 3... Wheel bearing, 4... Housing end member, 4a... Fitting portion, 8... Back plate, 10... Bearing retainer, 12... Seal member, 13... Elastic body, 14... Outer circumferential part, 15... Projection, 17... Clamping part, 20... Core bar, 20a... Cylindrical part, 20b
...End face part.

Claims (1)

[Scope of Claim for Utility Model Registration] A sealing member is provided between the end face of the axle housing that holds the outer ring of the wheel bearing and the bearing retainer that presses and fixes the wheel bearing to the axle housing side, the outer periphery of the end face of the axle housing. and a ring-shaped elastic body sandwiched between the end face of the axle housing and the bearing retainer, and a ring-shaped metal integrally bonded and fixed to the outer periphery of the elastic body. The core metal has an L-shaped cross section, and the core metal consists of a cylindrical part having an inner diameter larger than the outer diameter of the fitting part, and an end face part bent inward from one end of the cylindrical part, and the core metal has an L-shaped cross section. Covering from the end face part to the inner periphery of the cylindrical part with the elastic body,
A seal structure for a wheel bearing, characterized in that a plurality of axial protrusions are integrally formed on an elastic part that covers the inner periphery of a cylindrical part, and that are crimped onto the outer periphery of a fitting part of an axle housing.