JPH0214657Y2 - - Google Patents

Description

[Detailed explanation of the idea] <Industrial application field> The present invention relates to a constant velocity universal joint.

<Prior Art> In general, a constant velocity universal joint consists of an outer race, an inner race, balls that engage grooves formed on the inner surface of the outer race and the outer surface of the inner race, a gauge that holds the balls, and a gauge that holds the balls. It consists of a connecting shaft. Conventionally, the connection between the inner race and the shaft is achieved by forming annular grooves on the shaft at two positions corresponding to the front and rear surfaces of the inner race, fitting a snap spring into each annular groove, and pulling these snap springs to the front and rear surfaces of the inner race. This was done by doing so.

<Problem to be solved by the invention> When attempting to disassemble a constant velocity universal joint, even if the outer snap spring is removed and the shaft is pulled out against the inner race, the outer race side, that is, the back side snap spring may be stuck in the annular groove. The shaft may get caught in the front of the inner race while it is still fitted, and the shaft cannot be pulled out from the inner race. For this reason, conventional methods have been to cut the shaft very close to the inner race so that the inner race can rotate significantly relative to the outer race, remove the ball from the gauge, first disassemble the outer race and inner race, and then remove the shaft from the snap spring. I removed it and disassembled the inner race and shaft. As a result, there was a problem in that it took time and effort to cut the shaft.

<Means for Solving the Problems> The present invention was made to solve the above-mentioned problems, and includes a retainer on the inner surface of the inner race that holds the linear snap spring in a position where it is caught in the annular groove of the shaft. The cross-sectional shape of this holding part is formed on the inner peripheral surface parallel to the shaft, and a relief part with a larger diameter than the holding part is formed on the inner surface of the inner race to release the linear snap spring to a position where it will not be caught in the annular groove of the shaft. , and the cross-sectional shape of this relief portion is formed into an arcuate recess.

<Function> With the above-described configuration, the inner race and the shaft can be separated by removing the rectangular snap spring from the annular groove while supporting the shaft to which the inner race is attached, and pushing the shaft against the inner race. As a result, the linear snap spring, which was held in a position where it was caught in the annular groove by the holding part, was
The shaft is held in a position where it is not caught in the annular groove, that is, in the relief portion, and the shaft can be pulled out from the inner race.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, 10 indicates a driven shaft, and one end of this driven shaft 10 has a cylindrical outer race 1.
1 is formed, and a plurality of arc-shaped grooves 12 extending in the axial direction are formed at equal angular intervals on the inner peripheral surface of the outer race 11.

Reference numeral 13 indicates a drive shaft, and a spline 13a is formed at one end of the drive shaft 13, and a spline 14a of the inner race 14 is engaged with this spline 13a. The outer periphery of the inner race 14 is formed into a curved surface, and arcuate grooves 15 extending in the axial direction are formed at positions corresponding to the respective grooves 12 on the outer periphery.

Between the outer lace 11 and the inner lace 14,
A gauge 20 is interposed so that it can rotate smoothly with respect to the outer race 11 and the inner race 14, and ball holding windows 21 are formed in the gauge 20 at equal angular intervals on the circumference. A ball 22 is held in each ball holding window 21, and these balls 22
are engaged with both grooves 12 and 15 of the outer race 11 and the inner race 14.

The drive shaft 13 has a front surface 3 of an inner race 14.
0 and near the rear surface 31, a first annular groove 32 and a second annular groove 33 are formed, a linear snap ring 34 with a circular cross section that can expand radially outward is fitted into the first annular groove 32, The annular groove 33 has a rectangular snap spring 3 with a square cross section.
5 is inserted. The first annular groove 32 is deeply grooved so that the linear snap ring 34 can be reduced to a diameter smaller than the diameter of the hole 14b in the inner race 14.

Hole 1 on the outer race 11 side of the inner race 14
4b has a radially expanding linear snap ring 34 at a position corresponding to the first annular groove 32.
The drive shaft 1 is held in a position where it catches the tapered surface 36 of the inner race 14 and the first annular groove 32.
A retaining portion 37 is formed parallel to the retaining portion 37 and the outer race 11 side, and is further connected to the retaining portion 37 and the outer race 11 side so that the linear snap spring 34 is released to a position where it is not caught in the first annular groove 32 and is connected to the radial center of the linear snap spring 34. A relief portion 38 is formed to keep the linear snap ring 34 at a position that coincides with the radial center of the first annular groove 32. This relief part 3
8 has a larger diameter than the holding portion 37 and is formed so that the cross-sectional shape passing through the center line of the drive shaft 13 is an arcuate recess. A tapered surface 39 is formed on the inner surface of the hole 14b on the rear surface 31 side of the inner race 14.

Next, the assembly and disassembly operation of the constant velocity universal joint will be explained based on the above-described configuration. Outer lace 11
Gauge 20 to gauge 20, inner race 14 to gauge 20
are rotatably assembled, and the balls 22 are inserted into each ball holding window 21. Second annular groove 3 of drive shaft 13
3, and then a linear snap ring 34 is fitted into the first annular groove 32. In this state, the hole 14b of the inner race 14
Insert the drive shaft 13 into. During the insertion process, the linear snap ring 34 is radially contracted by the tapered surface 39 and passes through the spline 14a. When the linear snap ring 34 approaches the tapered surface 36, the linear snap ring 34 expands in the radial direction, and when the holding portion 37 prevents the expansion of the linear snap spring 34, the rectangular snap ring 35 comes into contact with the rear surface 31, and the drive shaft 13 Progress is blocked.
As a result, the drive shaft 13 and the inner race 14 are integrally coupled.

Conversely, when disassembling, remove the rectangular snap spring 35 while supporting the drive shaft 13, and push the drive shaft 13 into the inner race 14. As a result, the linear snap spring 34, which had been prevented from expanding in the radial direction by the holding portion 37, is moved to the relief portion 38.
When it reaches the inner race 14, it expands to a greater extent than the holding part 37, and is released to a position where it is not caught by the first annular groove 32 of the drive shaft 13, allowing the drive shaft 13 to be pulled out with respect to the inner race 14. Drive shaft 1
3 is pulled out, the inner race 14 is tilted greatly with respect to the outer race 11, the ball 22 is extracted, and the outer race 11, the gauge 20, and the inner race 14 are disassembled. When the inner race 14 is tilted, the linear snap ring 34 is held in the relief part 38, so the linear snap ring 34 is not pinched between the inner race 14 and the outer race 11.

<Effects of the Invention> As described above, the present invention has a structure in which a holding part is formed on the inner surface of the inner race parallel to the shaft to hold the linear snap spring in a position where it is caught in the annular groove of the shaft. Therefore, during disassembly, the rectangular snap spring can be easily removed from the annular groove by simply supporting the shaft, without the axial component due to the expansion force of the linear snap spring acting on the inner race. Furthermore, a relief part with a larger diameter than the holding part is formed on the inner surface of the inner race to release the linear snap spring to a position where it is not caught in the annular groove of the shaft, and the cross-sectional shape of this relief part is formed into an arc-shaped recess. When the shaft and inner race are disassembled, the linear snap spring is held in the relief part of the inner race, so there is no fear that the linear snap spring will fall into the outer race, and when the inner race is tilted, the linear snap spring is sandwiched between the inner race and the outer race. You can get unprecedented effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a constant velocity universal joint according to the present invention, FIG. 2 is a sectional view when the inner race and the drive shaft are separated, and FIG. 3 is a sectional view when the inner race and the drive shaft are assembled. 10... Driven shaft, 11... Outer race, 1
2, 15... Groove, 13... Drive shaft, 14... Inner race, 20... Gauge, 22... Ball, 3
2...First annular groove, 33...Second annular groove, 3
4... Linear snap spring, 35... Rectangular snap spring, 37... Holding section, 38... Relief section.

Claims (1)

[Scope of utility model registration request] An outer race is provided on one side of two mutually intersecting shafts, and an inner race is provided on the other side, grooves extending in the axial direction are formed on the inner surface of the outer race and on the outer surface of the inner race, respectively, and grooves are formed in the corresponding grooves of the outer race and the inner race. balls are fitted into the shaft, a gauge is provided to hold these balls, an annular groove is formed in the shaft at two positions corresponding to the front and rear surfaces of the inner race, and the annular groove on the outer race side has a cross section expanding radially outward. In the constant velocity universal joint, the inner race is held at a predetermined position on the shaft by fitting a circular linear snap spring into the annular groove on the opposite side of the outer race, and fitting a rectangular snap spring with a square cross section into the annular groove on the opposite side of the outer race. A holding part is formed on the inner surface of the race to hold the linear snap spring in a position where it is caught in the annular groove of the shaft, the cross-sectional shape of this holding part is formed on the inner peripheral surface parallel to the shaft, and a holding part is formed on the inner surface of the inner race. A constant velocity universal joint characterized in that a relief part having a larger diameter than a holding part is formed to release a linear snap spring to a position where it is not caught in an annular groove of a shaft, and the cross-sectional shape of this relief part is formed into an arcuate recess.