JPH04124338U - Boots for constant velocity joint - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to enable the large diameter part of the boot to be smoothly attached to the outer ring of a constant velocity joint whose outer diameter surface has been trimmed to reduce its weight. [Configuration] End surface 29 and inner surface 3 of large diameter portion 22 of boot 21
The configuration is such that a chamfered portion 32 is provided at the boundary portion of 1.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to boots for constant velocity joints, especially for constant velocity joints with weight reduction measures. This relates to boots worn on the int.

0002

[Conventional technology]

The boot of a constant velocity joint is a large piece that is attached to the outer diameter surface of the outer ring of the constant velocity joint. It has a diameter part and a small diameter part attached around the inner ring shaft at both ends, and a bellows part is formed between them. It is made of synthetic rubber such as chloroprene.

0003 On the other hand, as shown in Fig. 6, the cross-sectional shape of the outer ring 1 of the constant velocity joint has conventionally been circular. However, in order to reduce the weight, the outer diameter surface between the two ball grooves was The excess thickness is removed in the axial direction to form a roughly hexagonal shape as shown by the solid line in the same figure. . The top of the hexagon becomes the axial protrusion 3, and the space between each protrusion 3 is a substantially flat surface. This becomes the flat part 4.

0004 A circumferential boot engagement groove 5 is formed at the end of the above-mentioned protrusion 3 (see FIG. 5). . As shown in FIGS. 7 and 8, the inside of the large diameter part of the boot 6 attached to the outer ring 1 is The surface is formed into a substantially hexagonal shape so as to match each protrusion 3 and each flat portion 4 on the outer diameter surface of the outer ring 1. In addition to providing axial grooves 8 at six locations, a substantially flat flat portion 9 is provided between each groove 8. In addition, each groove 8 is provided with a rib 10 that fits into the engagement groove 5 of the outer ring 1. be.

[0005]

[Problem that the idea aims to solve]

In order to reduce the weight of the outer ring 1, the flat portion 4 was formed by cutting off the excess material as described above. In this case, the corner 12 between the flat part 4 and the end face 11 is chamfered (rounded and chamfered). -Includes both. ) Because it is difficult to process, it has a right angle and is angular. (See Figures 5 and 7). However, each corner 12 between the end surface 11 of each protrusion 3 ’ are on the same circumference, so chamfering is easy, so chamfering is applied. .

[0006] As mentioned above, if the corner 12 between the flat part 4 and the end face 11 is angular, the boot When fitting the large diameter portion of the boot 6 into the outer ring 1, the corner 13 between the end surface of the boot 6 and its inner surface is (See Figures 7 and 8) hits the corner 12 of the outer ring 1, so when installing the boot 6 It has the disadvantage of being a hindrance. In this case, if you force it into place, the end of the boot 6 may There is a risk of injury.

[0007] Therefore, this idea was developed for the above-mentioned constant velocity joint outer ring, which has been designed to reduce weight. The objective is to provide boots that can be smoothly worn.

[0008]

[Means to solve the problem]

In order to solve the above problems, this invention has been developed to It has a large diameter part that is attached to the inner ring shaft, and a small diameter part that is attached around the inner ring shaft. The inner surface of the part is fitted onto the axial protrusion on the outer diameter surface of the outer ring and the substantially flat part between each protrusion. In boots for constant velocity joints made of synthetic rubber formed into a shape of A chamfered portion is provided at the boundary between the end surface of the diameter portion and the inner surface.

[0009]

[Effect]

When fitting the large diameter part of the boot with the above configuration to the end of the outer ring, the flat part of the outer ring and the end face The chamfered part of the large diameter part of the boot touches the corner between the two, so the boot can be installed smoothly. It will be done.

0010

【Example】

As shown in FIG. 1, the boot 21 of the embodiment is basically the same as the conventional case. The large diameter portion 22 attached to the outer diameter surface of the end of the outer ring 1 of the speed joint and the inner ring shaft 23 It has small diameter parts 24 at both ends to be attached instead, and a bellows part 25 is formed between them, Constructed from synthetic rubber such as roloprene.

[0011] The outer ring 1 is similar to the conventional case shown in FIGS. 5 and 6, and therefore the boot 2 The shape of the inner surface of the opening end of the large diameter portion 22 of the outer ring 1 is similar to that of the conventional case. It is formed into a substantially hexagonal shape to match the protrusion 3 and each flat part 4 (see Fig. 2), and the top part of each An axial groove 26 is provided on the inner surface, and a substantially flat flat portion 27 is provided between each groove 26. In addition, each groove 26 is provided with a rib 28 that fits into the engagement groove 5 of the outer ring 1. It is.

0012 The difference from the conventional case is that the boundary between the end surface 29 of the large diameter portion 22 and its inner surface 31 is This is because a chamfered portion 32 is provided (see FIG. 3).

[0013] This chamfered portion 32 is a chamfer as shown in FIG. 3, and as shown in FIG. There are cases where it is as shown.

[0014] The boot of the embodiment is as described above, and the large diameter portion 22 is similar to the conventional case. It is attached to the outer diameter surface of the outer ring 1, and the small diameter portion 24 is attached to the outer diameter surface of the inner ring shaft 23. . When attaching the large diameter portion 22 to the outer diameter surface of the outer ring 1, the corner portion 12 of the flat portion 4 of the outer ring 1 is Then, the chamfered portion 32 of the boot 21 comes into contact with it. The end of the protrusion 3 of the outer ring 1 was originally Although it is a rounded surface, the chamfered portion 32 is also in contact with that surface. Therefore, press the boot 21. When pushed in, the large diameter portion 22 of the boot 21 smoothly fits onto the outer diameter surface of the outer ring 1, and the rib 28 engages. It is engaged with the matching groove 5.

[0015]

[Effect of the idea]

As mentioned above, the boot of this invention hits the corner of the outer ring end of the constant velocity joint. By providing a chamfered part on the end face of the large diameter part, it can be installed smoothly and without strain on the outer ring. It has the effect of

[Brief explanation of drawings]

[Figure 1] Cross-sectional view of the example in use

[Fig. 2] End view of the large diameter side of the boot of the example

[Figure 3] Partially enlarged sectional view of the example

[Figure 4] Partially enlarged sectional view of the example

[Fig. 5] Partial perspective view of the outer ring

[Fig. 6] Cross-sectional view of the outer ring

[Figure 7] Cross-sectional view of the conventional example in use

[Fig. 8] End view of conventional outer ring

[Explanation of symbols]

1 Outer ring 2 Ball groove 3 protrusions 4 Flat area 5 Engagement groove 21 boots 22 Large diameter part 23 Inner ring shaft 24 Small diameter section 25 Bellows part 26 Groove 27 Flat area 28 Rib 29 End face 31 Inside 32 Chamfered part

Claims (1)

[Scope of utility model registration request] Claim 1: A constant velocity joint has a large diameter section attached to the outer diameter surface of the outer ring end, and a small diameter section attached around the inner ring shaft, and the inner surface of the large diameter section is attached to the outer diameter of the outer ring. In a boot for a constant velocity joint made of synthetic rubber and formed into a shape that fits over the axially extending ridges of the surface and the substantially flat flat portion between each ridge, the end face and inner surface of the large diameter part are Boots for constant velocity joints characterized by having a chamfered part at the boundary.