JP2000145805A5

JP2000145805A5 -

Info

Publication number: JP2000145805A5
Application number: JP1998320932A
Authority: JP
Filing date: 1998-11-11
Publication date: 2006-01-12

Description

次に、図８は、本発明の実施の形態の第３例を示している。上述した第１〜２例の場合が、肩部４６ａの軸方向両端部に段部３０を形成していたのに対し、本例の場合には、この段部３０を、肩部４６ｂの軸方向一端部（図８の右端部）にのみ形成する事により、加工工数の低減を図っている。又、本例の場合、上記段部３０は、上記肩部４６ｂの軸方向両端部のうち、この肩部４６ｂの高さ寸法（この肩部４６ｂの基端縁である内側係合溝７の底面７ａから、この肩部４６ｂの先端面である内輪２Ｃの外周面２ａまでの直径方向に亙る寸法）が大きい側の端部（図８の右端部）に形成している。本例の場合、上記段部３０を上記肩部４６ｂの高さ寸法が大きい側の端部に形成する事とした理由は、以下の通りである。 Next, FIG. 8 shows a third example of the embodiment of the present invention. In the case of the first and second examples described above, the step portions 30 were formed at both ends in the axial direction of the shoulder portion 46a, whereas in the case of this example, the step portion 30 is used as the shaft of the shoulder portion 46b. By forming only at one end in the direction (right end in FIG. 8), the processing man-hours are reduced. Further, in the case of this example, the step portion 30 is the height dimension of the shoulder portion 46b (of the inner engaging groove 7 which is the base end edge of the shoulder portion 46b) among both ends in the axial direction of the shoulder portion 46b. It is formed at the end (right end in FIG. 8) on the side where the diameter direction from the bottom surface 7a to the outer peripheral surface 2a of the inner ring 2C, which is the tip surface of the shoulder 46b, is large. In the case of this example, the reason why the step portion 30 is formed at the end portion on the side where the height dimension of the shoulder portion 46b is large is as follows.

ところで、上記等速ジョイントの運転時に、この等速ジョイントのジョイント角が大きくなり、しかも大きなトルクを伝達する事に伴い、この等速ジョイントを構成する各ボール４（図１）が上記肩部４６ｂの端部に形成した上記段部３０の端縁に乗り上げた場合には、前記内側係合溝７に対する上記各ボール４の接触楕円が上記段部３０の端縁部分で途切れ、これら各ボール４の転動面に所謂エッジロードが加わる。これら各ボール４の転動面にこの様なエッジロードが加わると、これら各ボール４の転がり疲れ寿命が著しく低下する。但し、この場合に、上記各ボール４の転動面と上記段部３０の端縁との接触圧を小さくできれば、上記エッジロードによる転がり疲れ寿命の低下を抑える事ができる。この為、本例の場合には、上記エッジロードによる上記各ボール４の転がり疲れ寿命の低下を抑えるべく、これら各ボール４の転動面と上記段部３０の端縁との接触圧が最も小さくなる部分である、上記肩部４６ｂの高さ寸法が最大となる側の端縁（図８の右端縁）に、前記段部３０を形成する事とした。その他の構成及び作用は、前述した第１例の場合と同様である。
By the way, when the constant velocity joint is operated, the joint angle of the constant velocity joint becomes large, and as a large torque is transmitted, each ball 4 (FIG. 1) constituting the constant velocity joint has the shoulder portion 46b. When riding on the edge of the step 30 formed at the end of the ball 4, the contact ellipse of each ball 4 with respect to the inner engaging groove 7 is interrupted at the edge of the step 30, and each of these balls 4 So-called edge load is added to the rolling surface of. When such an edge load is applied to the rolling surface of each of these balls 4, the rolling fatigue life of each of these balls 4 is significantly reduced. However, in this case, if the contact pressure between the rolling surface of each ball 4 and the edge of the step portion 30 can be reduced, it is possible to suppress a decrease in rolling fatigue life due to the edge load. Therefore, in the case of this example, the contact pressure between the rolling surface of each of the balls 4 and the edge of the step portion 30 is the highest in order to suppress a decrease in the rolling fatigue life of each of the balls 4 due to the edge load. It was decided to form the step portion 30 at the end edge (right end edge in FIG. 8) on the side where the height dimension of the shoulder portion 46b is maximized, which is a smaller portion. Other configurations and operations are the same as in the case of the first example described above.