JPH0545251U - Boot fixing device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to improve the sealing property of the fixed portion of the boot 40, both ends of which are connected to the outer periphery of the drive shaft 13 and the outer race. [Structure] O formed on the inner circumference of the drive shaft 13 and the boot 40
The O-ring 50 was fitted into the groove 42, 43 of the ring to improve the sealing property. Also, the swaging of the clamp clamp band was improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a boot fixing device used in a constant velocity joint.

[0002]

[Prior Art]

 The joint part of the constant velocity joint has flexible boots to hold grease inside the joint and to prevent dust from entering the joint. Conventionally, this boot is fixed by forming a boot fitting groove with a trapezoidal cross section and an annular shape on the outer circumference of a cylindrical outer race and the outer circumference of a shaft bendably connected to this outer race. Trapezoidal protrusions provided on the end and the small-diameter end are fitted, and in that state, as shown in FIG. 4, the boot outer periphery is clamped and fixed by a caulking clamp 41.

[0003]

[Problems to be solved by the device]

 In this type of boot fixing device, when the caulking clamp 41 tightens the boot 40, the boots 40 other than the joints 40a of the caulking clamp 41 are elastically deformed and pressed by the clamp band 41a. , A force acts on the boot portion corresponding to the seam 40a. By this force, the boot 40 corresponding to the joint 40a of the caulking clamp 41 rises up and stops the caulking clamp 41 from slipping. Therefore, after caulking, the tip of the caulking clamp band portion 41a is squeezed at the seam 40a of the caulking portion. There was a problem that the boot 40 had a bad seal and the boot 40 had a poor seal.

[0004]

[Means for Solving the Problems]

 The present invention has been made to solve the above-mentioned problems, and in a boot fixing device having both ends connected to the outer circumference of a cylindrical outer race and the outer circumference of a shaft bendably connected to the outer race, A semi-elliptical O-ring groove is formed in each of the boot fitting groove portion and the boot fitting portion, and an O ring is fitted in the O ring groove.

[0005]

[Action]

 The O-ring is fitted into the elliptical O-ring groove formed by the boot fitting groove of the shaft flexibly connected to the outer race and the fitting portion of the boot, and the O-ring becomes oval when the caulking clamp is tightened. By deforming, the boot corresponding to the joint of the caulking clamp does not rise and the sliding of the caulking clamp band is improved.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 10 denotes a driven shaft, and a cylindrical outer race 11 is integrally formed at an end of the driven shaft 10. The inner circumference of the outer race 11 is spherical, and a plurality of arcuate grooves 12 extending in the axial direction are formed at equal intervals on the circumference. Reference numeral 13 denotes a drive shaft that is rotatably connected to the outer race 11 so as to be bendable, and an inner race 14 is fitted to an end of the drive shaft 13 by a spline 13a. The outer circumference of the inner race 14 is spherical, and a plurality of arcuate grooves 15 extending in the axial direction are formed at positions corresponding to the arcuate grooves 12 formed on the inner circumference of the outer race 11. A cage 20 is fitted between the outer race 11 and the inner race 14 to fit the inner circumference of the outer race 11 and the outer circumference of the inner race 14, and the cage 20 is inserted into the grooves 12 and 15 to transmit torque. The balls 22 are held at equal intervals on the circumference.

A boot 40 made of resin is attached to the joint portion having the above structure to retain grease inside the joint and prevent dust and the like from entering the joint portion. On the outer race 11 side, the boot 40 fits into the annular boot fitting groove portion 14 having a trapezoidal cross section formed on the outer circumference of the outer race 11 and is swaged into an annular groove 35 provided on the outer circumference of the boot 40. O-ring grooves 42 and 43 having semi-elliptical cross sections are formed on the outer periphery of the drive shaft 13 and the inner periphery of the boot 40 on the drive shaft 13 side, respectively. The O-ring 50 is fitted into the boots 42 and 43, and the boot 40 is fitted into the boot fitting groove portion 15 having a trapezoidal cross section formed on the outer circumference of the drive shaft 13 and fitted into the annular groove 36 provided on the outer circumference of the boot 40. The caulking clamp 41 is attached and fixed.

The structure of the seal portion will be described on the drive shaft 13 side. As shown in FIG. 2, the O-ring grooves 42 and 43 formed on the outer circumference of the drive shaft 13 and the inner circumference of the boot 40, respectively, have a semi-elliptical cross section. When the ring 50 is fitted and the caulking clamp 41 is attached and tightened from the outer periphery of the boot 40, the O-ring 50, which is an elastic body, is deformed into an elliptical shape formed by the O-ring grooves 42 and 43. At the time of tightening the caulking clamp 41, the boot 40 corresponding to the seam 40a other than the seam 40a of the caulking clamp 41 is elastically deformed and is pressed by the clamp band 41a, and the boot 40 corresponding to the seam 40a of the caulking clamp 41 is elastically deformed. Since the force that has been raised is compressed toward the inside of the O-ring 50 and escapes, the boot 40 that corresponds to the joint 40a of the crimp clamp 41 is prevented from rising and the slip of the crimp clamp band 41a is well prevented. To do. Further, since the deformation of the O-ring 50 and the compressive force act on the O-ring 50, a strong sealing function is generated in the O-ring grooves 42 and 43, so that the sealing performance can be improved. In the above embodiment, the O-ring is fitted on the drive shaft 13 side, but the present invention can be applied to the outer race 11 side.

[0009]

[Effect of the device]

 INDUSTRIAL APPLICABILITY As described above, the present invention provides a boot fixing device in which both ends are connected to the outer circumference of a cylindrical outer race and the outer circumference of a shaft bendably connected to the outer race, the boot fitting groove portion of the shaft and the boot fitting groove portion. O-ring grooves with a semi-elliptical cross section are formed in the fitting parts, respectively, and the O-rings are inserted into the O-ring grooves. The deformation of the swaging clamp improves the slippage of the swage clamp band, and the swaging clamp is tightened without the band being bent into a doglegged shape. In addition, the deformation and compression force of the O-ring cause the O-ring. The strong sealing function is generated in the O-ring groove by the above action, so that the sealing performance can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a constant velocity joint which is an embodiment of the present invention.

FIG. 2 shows a relationship between an O-ring groove and an O-ring according to an embodiment of the present invention.

FIG. 3 shows an enlarged view of a main part of FIG.

FIG. 4 shows a conventional boot fixing device.

[Explanation of symbols]

 11 Outer Race 13 Drive Shaft 17 Boot Fitting Groove 40 Boot 42 Drive Shaft Side O Ring 43 Boot Side O Ring 50 O Ring

Claims (1)

[Scope of utility model registration request] 1. A boot fixing device in which both ends are connected to an outer circumference of a cylindrical outer race and an outer circumference of a shaft bendably connected to the outer race, and the outer circumferences of both end portions are caulked with a clamp. A boot fixing device, wherein an O-ring groove having a semi-elliptical cross section is formed in each of the boot fitting groove portion and the boot fitting portion, and an O-ring is fitted into the O-ring groove.