JP2598534Y2 - Boots for constant velocity joints - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin boot used to protect a constant velocity joint used for a drive shaft of an automobile from dust and water.

[0002]

2. Description of the Related Art As a synthetic resin boot for a constant velocity joint, a flexible boot as shown in FIG. 12 has been conventionally used. The boot 1 is made of a hard synthetic resin such as a thermoplastic polyester elastomer material, has a plurality of folds 2, and has a small-diameter end 4 and a large-diameter end 3 open. The small diameter side end 4 is mounted around a shaft 6 of the constant velocity joint 5 and fastened by a band 7. The large-diameter end 3 is fitted to an outer peripheral surface of one end of an annular adapter 8 made of a steel plate and fastened by a band 9. The adapter 8 is fitted and fixed around the outer ring 10 of the constant velocity joint 5.

[0003]

Since the synthetic resin boot 1 is hard, the tightening bands 7 and 9 generally require a strong tightening force, so that the cost is high in structure and material. It becomes necessary, and a stepping stone or the like on a road easily hits a protruding projection generated at the time of fastening.

[0004] Therefore, an object of the present invention is to combine a boot and an adapter by a low-cost fastening means instead of a high-cost fastening band.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a constant velocity joint boot in which a metal adapter is integrally attached to a large diameter end of a synthetic resin boot. of the boot end, it folded axially inwardly of said adapter, further folded axially outwardly, provided with a clamping portion that is released to the boot side, a large of the boot via the elastic member to the clamping unit In this configuration, the radial end portion is inserted, and the holding portion is caulked together with the elastic material to integrate the boot and the adapter.

[0006] Incidentally, the smaller diameter end of the upper Symbol plastic boot, through an elastic member mounted on the outer periphery of the shaft, have a structure was tightening the fastening band on the small diameter side end portion outer peripheral surfaces
Wear. Further, it is possible to adopt a configuration in which an axial groove is formed on both ends of the elastic member on the inner peripheral surface of the elastic member.

[0007]

The boot and the adapter are joined together by swaging the holding portion of the adapter without using a fastening band.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic structure of the boot 1 of the embodiment shown in FIG. 1 is the same as that of the conventional boot. Therefore, the same parts are denoted by the same reference numerals and their description is omitted.

A configuration different from the conventional one is a coupling structure between the large-diameter end 3 of the boot 1 and the adapter 8. That is, as shown in FIG. 2, the end of the adapter 8 on the boot 1 side is bent inward at the first bent portion 11, and an axially inward folded portion is formed along the inner diameter surface of the adapter 8. 12 are formed. The folded portion 12 is bent inward to form a second bent portion 13, and the second bent portion 1 is formed.
From 3, an axially outwardly folded portion 14 is formed along the inner diameter surface of the aforementioned folded portion 12. The boot 1 is formed by the two folded portions 12 and 14 including the second bent portion 13 described above.
A holding portion 15 opened to the side is formed on the inner peripheral surface of the adapter 8.

The large diameter end 3 of the boot 1 is provided with a rib 16 for retaining the rib. The rib 16 is inserted into the holding portion 15, and the folded portion 14 inside the holding portion 15 is swaged. Then, the large diameter end 3 of the boot 1 is connected to the adapter 8.

Another embodiment shown in FIG. 3 is a first and second embodiment.
The bent portions 11 and 13 are bent outward, and a holding portion 15 is formed on the outer peripheral surface of the adapter 8. Other configurations are the same as those described above.

In each of the embodiments shown in FIGS. 4 and 5, the holding portion 15 is formed on the inner peripheral surface of the adapter 8 as in the case of FIG. In the case of FIG. 4, the large-diameter end 3 of the boot 1 is formed.
5, and in the case of FIG. 5, an elastic member 17 such as rubber, which is softer than the boot 1, is incorporated into the rib 16 side.
7 and the folded portion 14 is crimped. The elastic member 17 relieves the hard boot 1 and the adapter 8 from being hardly adapted to each other and further strengthens the integration of the two.

In each of the embodiments shown in FIGS. 6 and 7, the holding portion 15 is formed on the outer peripheral surface of the adapter 8 in the same manner as in FIG. 3 described above, and in the same manner as in FIGS. Elastic material 1
7 is assembled into the holding portion 15 and caulked.

In the embodiment shown in FIG. 8, the holding portion 15 is formed on the inner peripheral surface of the adapter 8 as in the case of FIG.
A plurality of holes 18 are made in the large-diameter end portion, and a part of the elastic member 17 incorporated in the holding portion 15 is fitted into the hole 18 so as to integrate the boot 1 and the elastic member 17. It is.

In the embodiment shown in FIGS. 9 and 10, the end of the outer race 10 of the constant velocity joint on the shaft 6 side is slightly extended to the shaft 6 side from each of the above embodiments. .

A crimping groove 1 is formed on the outer peripheral surface of the extended portion.
9 is fixed to the outer race 10 by caulking the outer periphery of the adapter 8 '. The holding portion 15 provided on the inner periphery of the adapter 8 ′ is folded back in the same manner as described above, and holds the large-diameter end of the boot 1.

A circumferential groove 20 is formed in a portion of the shaft 6 where the small diameter side end of the boot 1 is mounted, and a rubber-based elastic member 21 having a width extending over the circumferential groove 20 and both sides thereof is mounted. The elastic member 21 has on its inner peripheral surface a rib 22 that fits into the peripheral groove 20, and on its outer peripheral surface, a groove 24 that fits the rib 23 on the inner peripheral surface of the boot 1 is formed.

The small-diameter portion of the boot 1 is mounted on the outer peripheral surface of the elastic member 21, and the one-touch band 26 is fastened to the groove 25 on the outer peripheral surface of the small-diameter portion. A small rib 27 is formed on the inner peripheral surface of the one-touch band 26, and a groove 28 in which the rib 27 fits is formed on the outer peripheral surface of the small diameter portion of the boot 1. The reason why a simple band such as the one-touch band 26 described above may be used is that the elastic member 21 is interposed between the band 6 and the shaft 6. According to this one-touch band 26, there is no convex projection like the fastening band 7 of each of the above embodiments, and interference with foreign matter is reduced.

In the embodiment shown in FIG. 11, the inside of the boot 1 is communicated with the outside air by forming a groove 29 on both ends in the axial direction on the inner peripheral surface of the elastic member 21. In this way, even if the constant velocity joint generates heat, an increase in the internal pressure of the boot 1 can be prevented, so that abnormal deformation of the boot 1 does not occur.

[0020]

[Effect of the Invention] As described above, in this invention, the boot is integrated with the adapter by inserting the large-diameter end of the boot into the holding portion provided on the adapter and crimping the holding portion. Therefore, the conventional fastening band can be omitted, the cost can be reduced, and the band is not lost due to the flying stones.

Further, by attaching an elastic member around the small diameter side end of the boot and the shaft, a simple fastening band having no projection can be used. This has the effect of eliminating defects.

[Brief description of the drawings]

FIG. 1 is a sectional view of a use state of an embodiment.

FIG. 2 is a partially enlarged sectional view of the above.

FIG. 3 is a partially enlarged sectional view of another embodiment.

FIG. 4 is a partially enlarged cross-sectional view of another embodiment.

FIG. 5 is a partially enlarged cross-sectional view of another embodiment.

FIG. 6 is a partially enlarged cross-sectional view of another embodiment.

FIG. 7 is a partially enlarged cross-sectional view of another embodiment.

FIG. 8 is a partially enlarged sectional view of another embodiment.

FIG. 9 is a sectional view of another embodiment.

FIG. 10 is a partially enlarged sectional view of FIG. 9;

FIG. 11 is an enlarged sectional view of a modification of FIG. 9;

FIG. 12 is a sectional view showing a use state of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Boot 2 Fold 3 Large diameter end 4 Small diameter end 5 Constant velocity joint 6 Shaft 7 Band 8, 8 'Adapter 9 Band 10 Outer ring 11 First bent part 12 Folded part 13 Second bent part 14 Folded part 15 Nipping part 16 Rib 17 Elastic material 18 Hole 19 Caulking groove 20 Peripheral groove 21 Elastic member 22 Rib 24, 25 groove 26 One-touch band 27 Rib 28 Groove 29 Groove

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16D 3/84 F16J 3/04 F16J 15/52

Claims (3)

(57) [Scope of request for utility model registration] 1. A constant velocity joint boot in which a metal adapter is integrally attached to a large-diameter end of a synthetic resin boot, wherein the adapter is folded inward in the axial direction of the adapter at the boot-side end of the adapter. Further, folded back outward in the axial direction, a holding portion opened to the boot side is provided, and the large-diameter end of the boot is inserted into the holding portion via an elastic material .
A boot for a constant velocity joint, wherein the holding portion is caulked together with the elastic material to integrate the boot and the adapter. 2. The small-diameter end portion of the synthetic resin boot is
The constant velocity joint boot according to claim 1, wherein the boot is mounted on an outer periphery of the shaft via an elastic member, and a fastening band is fastened to an outer peripheral surface of the small-diameter end portion. 3. An axial groove is formed on an inner peripheral surface of the elastic member.
The boot for a constant velocity joint according to claim 1, wherein the boot is formed over both ends of the elastic member.