JP2000074084A - Falling stop device and constant velocity joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a falling stop device and a constant velocity joint devised to allow movement of an inside member to the deep side of an outside member and to constrain falling of the inside member from the opening side. SOLUTION: A ring groove 50 becoming deeper toward the deep side from the opening side is provided on an inner peripheral surface of an opening part of an outside member 32 (outer race), a snap ring 51 having a bent part 52 a part of which is bent in the axial direction toward the deep side from the opening side and having a convex curve part 53 is engaged with the ring groove 50, a diameter of the snap ring 51 is opened wide and movement of an inside member 33 (inner race) to the deep side of the outer member 32 is allowed at the time when the snap ring 51 is pushed to the deep side of the ring groove 50 by the inside member 33 (inner race), and as the snap ring 51 is engaged with the ring groove 50 at an initial state in movement to fall from the opening part of the outside member 32, the inside member 33 is engaged with the snap ring 51 and falling from the opening part is constrained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining device and a constant velocity joint.

[0002]

2. Description of the Related Art As shown in FIG. 7, a constant velocity joint, which is interposed on an axle shaft of an automobile and transmits the output of an engine to wheels at a uniform angular velocity, has an outer race 32,
Inner race 33, cage 34 and a plurality of balls 35
At one end of the outer race 32, a shaft portion 36 is continuously provided. The shaft portion 36 has a mounting portion 37 and a serration 38 for connecting to a differential gear side.

The opposing surfaces of the outer race 32 and the inner race 33 have ball grooves 39, 40 parallel to the axial direction, respectively.
Are formed corresponding to the number of the balls 35, and the balls 35 are engaged with these ball grooves 39, 40,
Each ball 35 is held in a cage hole of a cage 34 interposed between the outer race 32 and the inner race 33.

The outer race 32 and the inner race 33
Is relatively movable in the axial direction including the ball 35,
A groove 43 in which a snap ring 42 is engaged is provided on the inner peripheral surface of the opening at the other end of the outer race 32, and the inner race 33 including the ball 35 is formed by the snap ring 42 engaged with the groove 43. It keeps it from coming out of the opening.

[0005]

The above-mentioned conventional constant velocity joint is assembled by attaching the snap ring 42 to the outer race 3 with the inner race 33 including the ball 35 inserted into one end of the axle shaft 30 in the outer race 32.
2 is engaged with a groove 43 provided on the inner peripheral surface of the opening.

Therefore, the mounting of the snap ring 42 in the groove 43 is hindered by the axle shaft 30 and the boot 45 is temporarily mounted on the axle shaft 30. Yes,
It took time and effort to attach the snap ring 42.

Further, since the boot 45 is mounted on the opening of the outer race 32 after the mounting of the snap ring 42, it is not easy to confirm that the snap ring 42 is mounted properly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stopper device which allows the inner member to move to the back side of the outer member and restricts the inner member from coming off from the opening side, and a constant velocity joint to which the device is applied. That is.

[0009]

In order to achieve the above-mentioned object, the present invention comprises a cylindrical outer member having at least one opening, and an inner member axially movable in the outer member. A device for retaining an inner member with respect to an outer member, wherein the annular member is provided on an inner peripheral surface of an opening of the outer member, the annular groove being deeper from an opening side toward a back side, and engaging with the annular groove. , A part of which consists of a snap ring that is bent in the axial direction from the opening side to the back side,
The annular member and the snap ring allow the inner member to move from the opening of the outer member to the back side, and restrain the escape from the opening side.

The snap ring has, at a part thereof, a radially projecting convex portion, and the convex portion is bent in the axial direction from the opening of the outer member toward the back. It is characterized by the following.

In the above configuration, the annular groove width: A, the inner groove diameter of the annular groove: φD, the opening groove depth: t1, the inner groove depth: t2, the diameter of the snap ring cross section: dr, the axial direction of the snap ring Bending width: B, snap ring outer diameter before mounting: d0, height of the convex portion of the snap ring: t3, t2 ≧ dr ≧ t1, d0> φD, B> A, t2 ≧ t
It is characterized in that the equation of 3 ≧ t1 is satisfied.

The outer member is an outer race, the inner member is an inner race, and the cage is held in a plurality of ball grooves provided to face an inner peripheral surface of the outer race and an outer peripheral surface of the inner race. The above-mentioned retaining device is used for a constant velocity joint formed by engaging a ball.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a retaining device according to the present invention will be described below with reference to the drawings using a constant velocity joint. In FIG. 1, 32 is an outer race (outer member),
Reference numeral 33 denotes an inner race (inner member), and a plurality of ball grooves 39 and 40 are provided facing the inner peripheral surface of the outer race 32 and the outer peripheral surface of the inner race 33.
The balls 35 held by the cage 34 are engaged with the ball grooves 39 and 40. An annular groove 50 is provided on the inner peripheral surface of the opening of the outer race 32, and a snap ring 51 is engaged with the annular groove 50.

The annular groove 50 and the snap ring 51
In the present invention, the snap ring 51 is not simply used as a conventional retaining member, but the snap ring 51 is previously set in the annular groove 50.
The annular groove 50 and the snap ring 5
1, the inner race 33 (inner member) is allowed to move from the opening of the outer race 32 (outer member) to the back side, and is restrained from coming off from the opening side.

Therefore, the annular groove 50 is formed in the outer race 3.
2 has a shape that tapers deeper from the opening side to the back side. Further, the snap ring 51 has a bent portion 52 whose cut portion is bent in the axial direction from the opening side of the outer race 32 toward the back side as shown in FIG. 2 and in the radial direction as shown in FIG. Convex part 5 protruding from
3.

More specifically, in FIG.
Annular groove width: A, inner groove diameter of the annular groove: φD, opening groove depth: t1, depth groove depth: t2, snap ring cross-section diameter: dr, snap ring axial bending width: B, before mounting When the outer diameter of the snap ring is d0 and the height of the convexly curved portion of the snap ring is t3, the relationship has the following relationship. t2 ≧ dr ≧ t1, d0> φD, B> A, t2 ≧ t3 ≧
t1

Since the present invention has the structure described above, the snap ring 51 is previously attached to the outer race 32 (outer member).
5 and 6, the snap ring 51 protrudes in the radial direction and the convex portion 53 bent by the bent portion 52 forms the annular groove 50 as shown in FIGS.
On the shallow side of That is, the snap ring 51 is engaged by applying elastic force in the radial direction and the axial direction of the annular groove 50 by the spring action of the cut portion (the bent portion 52 and the convex bent portion 53). At this time, the snap ring 51 has a part of a cross section other than the convexly curved portion 53 in the annular groove 5.
0 protrudes radially on the shallow side. In this state, the inner race 33 is inserted from the opening of the outer race 32. At this time, the inner race 33 moving from the opening side to the back side pushes the snap ring 51 to the back side, and the snap ring 51 is moved toward the deep side of the annular groove 50 as shown in FIG. The diameter of the snap ring 51 is expanded by the spring action of the (bent part 52 and the convex part 53) to allow the inner race 33 to move to the far side.

When the inner race 33 that has passed through the snap ring 51 moves in a direction to come out of the opening of the outer race 32 (outer member), the snap ring 51 moves to the position shown in FIG.
The ball 35 is locked by the snap ring 51 because it is initially engaged with the annular groove 50 as shown by. Therefore, the removal of the inner race 33 from the opening of the outer race 32 is restricted.

In a constant velocity joint using such a retaining device, the outer race 32 has a ball 35 and a cage 3.
4 including inner race 33 and axle shaft 30
Before attaching the snap ring 51 to the outer race 32
Can be engaged with the annular groove 50, so that the time and effort required for mounting can be saved and the mounting time can be shortened.

Further, since the snap ring 51 can be mounted in the single state of the outer race 32, it is easy to check the mounting state, and the checking time can be shortened.

Furthermore, after the snap ring 51 can be securely mounted, the inner race 33 including the ball 35 and the cage 34 is assembled to the outer race 32 after the inner race 33 including the ball 35 and the cage 34 is assembled. 3
3 does not fall out of the outer race 32, so there is no fear that the inner race 33 including the ball 35 and the cage 34 will fall out of the outer race 32 during transportation or assembling work to the vehicle, and parts such as the ball 35 will fall apart.

It should be noted that the retaining device according to the present invention can be widely applied to assembly of components other than constant velocity joints.

[0023]

As described above, according to the present invention, according to the first aspect of the present invention, the inner member is prevented from coming off from the opening of the outer member by the shape of the annular groove and the snap ring. The snap ring is allowed to move and the removal from the opening side is restrained, so the time and effort required to attach the snap ring can be saved, the attachment time can be shortened, and the attachment state can be checked. It becomes easier and the confirmation time can be shortened. Further, since the inner member does not come off from the outer member, it can be handled with ease.

According to the second aspect of the present invention, the snap ring has, at a part thereof, a convexly curved portion projecting in the radial direction, and this convexly curved portion extends in the axial direction from the opening of the outer member toward the back side. Since the inner ring is bent, when the inner member is inserted from the opening of the outer member, the snap ring is pushed to the rear side and is brought closer to the deep side of the annular groove, and the inner member passing through the snap ring is opened by the opening of the outer member. For movement out of the section, the snap ring is pushed to the shallow side of the annular groove to restrain the inner member from slipping.

According to the third aspect of the present invention, the groove width: A, the depth groove diameter of the annular groove: φD, the depth of the opening groove: t1, the depth of the depth groove: t2, the diameter of the snap ring cross section: dr, the snap ring When the axial bending width: B, the snap ring outer diameter before mounting: d0, and the height of the convex portion of the snap ring: t3, t2 ≧ dr ≧ t1, d0> φD, B> A, t2 ≧ t3 ≧
When the inner member is inserted from the opening of the outer member, the diameter of the snap ring is expanded by the spring action of the bent portion and the convex portion, so that the inner member can be easily moved to the back side when the inner member is inserted. At the same time, when the inner member that has passed through the snap ring moves in a direction to come out of the opening of the outer member, since the snap ring is initially engaged with the annular groove, the inner member is locked by the snap ring. The outer member is restrained from falling out of the opening.

In the constant velocity joint using the retaining device according to the first, second or third aspect of the present invention (the invention of the fourth aspect), the conventional problems can be solved by the above effects.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a constant velocity joint using the apparatus of the present invention.

FIG. 2 is a sectional view after a snap ring is attached.

FIG. 3 is a front view of a snap ring.

FIG. 4 is a cross-sectional view showing a related configuration of each part of the device of the present invention.

FIG. 5 is a sectional view of an opening of the outer race.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a sectional view of a conventional constant velocity joint.

[Explanation of symbols]

 32 outer race 33 inner race 34 cage 35 ball 50 annular groove 51 snap ring 52 bent part 53 convex part

Claims (4)

[Claims] 1. An apparatus comprising: a cylindrical outer member having at least one open side; and an inner member movable in the outer member in an axial direction, wherein the inner member is prevented from coming off with respect to the outer member. An annular groove provided on the inner peripheral surface of the opening of the outer member, the annular groove being deeper from the opening side to the inner side; and the annular groove is engaged with the annular groove, and a part of the annular groove extends axially from the opening side to the inner side. The inner member is allowed to move from the opening of the outer member to the back side by the annular groove and the snap ring, and the removal from the opening side is restrained. Characteristic retaining device. 2. The snap ring has, at a part thereof, a radially projecting convex part, and the convex part is bent in the axial direction from the opening of the outer member toward the back side. The retaining device according to claim 1, wherein: 3. The method according to claim 2, wherein the annular groove width: A,
Diameter of the back side groove of the annular groove: φD, depth of the opening side groove: t1, depth of the back side groove: t2, diameter of the snap ring cross section: dr, bending width of the snap ring in the axial direction: B, outer diameter of the snap ring before mounting: d0 When the height of the convex portion of the snap ring is t3, t2 ≧ dr ≧ t1, d0> φD, B> A, t2 ≧ t3 ≧
A retaining device, wherein the formula of t1 is satisfied. 4. The cage according to claim 1, wherein the outer member is an outer race, the inner member is an inner race, and a plurality of ball grooves are provided facing an inner peripheral surface of the outer race and an outer peripheral surface of the inner race. A constant velocity joint, wherein the retaining device according to claim 1, 2, or 3 is used in a constant velocity joint formed by engaging a held ball.