Installation structure for boot for constant velocity universal joint and method of manufacturing constant velocity universal joint

Abstract

An installation structure for a boot for a constant velocity universal joint can assure stable sealing performance at low cost. A resin boot (1) for a constant velocity universal joint has a small-diameter end (2) and a large-diameter end (3) that have a circular tubular shape. The small-diameter end (2) is fixed to a shaft (17) forming an inner member, and the large-diameter end (3) is fixed to an outer ring (11) as an outer member. The inner peripheral surface of the small-diameter end (2) is integrally joined in abutment with the outer peripheral surface of a boot installation section (18) of the shaft (17) by physical mutual action between resin forming the boot (1) and metal forming the shaft (17). The inner peripheral surface of the large-diameter end (3) is integrally joined in abutment with the outer peripheral surface of a boot installation section (19) of the outer ring (11) by physical mutual action between the resin forming the boot (1) and metal forming the outer ring (11).

Description

technical field [0001] The present invention relates to a mounting structure for a shield for a constant velocity universal joint and a method for manufacturing the constant velocity universal joint. Background technique [0002] For example, in the constant velocity universal joints assembled in the power transmission mechanism of automobiles or various industrial machines, in order to prevent foreign matter such as dust from entering the joint and prevent the grease sealed inside the joint from leaking, a guard (constant velocity universal joint) is installed. connector cover). [0003] Such shield 100, for example Figure 5 It has cylindrical small-diameter end part 101 and large-diameter end part 102 as shown. The small-diameter end portion 101 is connected to the large-diameter end portion 102 via a meander portion 106 in which mountain portions 104 and valley portions 105 are alternately formed. The small-diameter end portion 101 and the large-diameter end portion 10...

AI Technical Summary

Problems solved by technology

[0006] In order to ensure stable sealing performance in the above-mentioned structure, it is necessary to fasten the shield band 108 with high precision with a predetermined amount of interference, but it is difficult to perform this high-precision fastening simply and without variation among individuals.

Especially in the case where the annular protrusion is provided on the outer peripheral surface of the first mating member (shaft 112 ) to improve the sealing performance as described above, it is more difficult to fasten the shield band 108 with good accuracy.

Also, due to the difficulty in tying the boot straps and the increased number of parts due to the use of the boot straps 108, an increase in the cost of the constant velocity universal joint cannot be avoided.

[0007] In addition, the resin boot is generally molded, but when the grooves 107 are provided on the outer peripheral surfaces of the small-diameter end portion 101 and the large-diameter end portion 102 as described above, the molding mold of the boot 100 becomes complicated.

In addition, in the above-mentioned structure, the shape of the shaft 112 becomes complicated to the extent that the annular protrusions 113 and 114 are provided on the shaft 112.

The complexity of the molding die or part shape leads to an increase in the cost of the constant velocity universal joint

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