JP2600659Y2 - Universal joint sealing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a sealing device for a universal joint.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, an outer ring 41 attached to an open end 21a of an outer race 21 of a universal joint and having a holding portion 41a having a substantially U-shaped cross section at one axial end is provided.
The boot 4 having the outer peripheral edge 42a inserted into the holding portion 41a
2. There is known a universal joint sealing device in which the holding portion 41a is caulked from the inner peripheral side and the boot 42 is fixed to the outer ring 41. Further, as shown in FIG. 4, there is known a universal joint sealing device in which the holding portion 41a is swaged from its outer peripheral side instead of being swaged from its inner peripheral side.

However, in each of the above-mentioned conventional sealing devices, a step portion 41b is provided in the center of the outer ring 41 in the axial direction, and the step portion 41b is brought into contact with the opening end 21a of the outer ring 21 at the time of mounting, thereby positioning in the axial direction. Are doing. Therefore, according to the conventional sealing device, the diameter of the holding portion 41a is determined based on the inner peripheral edge of the step portion 41b, and the inner diameter of the holding portion 41a is small. There is a problem that the operating angles θ ₂ and θ ₃ cannot be made large.

[0004] In order to address this problem, the present applicant has previously bent the holding portion of the outer ring away from the drive shaft as disclosed in Japanese Utility Model Laid-Open Publication No. 2-50518. Proposed to increase the maximum operating angle of the drive shaft, but according to this conventional technique, the plating applied to the surface of the outer ring is peeled off when bending the holding portion,
There is a problem that the corrosion resistance of the outer ring is reduced. To cope with this problem, it is conceivable to apply a plating treatment to the outer ring after bending the holding portion. However, if the manufacturing procedure is made in this manner, the boot may be damaged by plating-related chemicals. The problem of the peeling of the plating is a problem in the prior art shown in FIG. 3 or FIG. 4 because the outer ring 41 is caulked.

[0005]

SUMMARY OF THE INVENTION In view of the above, the present invention increases the maximum operating angle of the drive shaft as compared with the prior art shown in FIG. 3 or FIG. 4 and removes the plating applied to the surface of the outer ring. An object of the present invention is to provide a sealing device that is prevented from being sealed.

[0006]

In order to achieve the above object, the sealing device of the present invention is attached to the open end of the outer ring of the universal joint, and has a holding portion having a substantially U-shaped cross section at one axial end. In a universal joint sealing device having an outer ring and a boot having an outer peripheral edge inserted into the holding portion, an axial end is pressed into the holding portion to fix the boot to the outer ring. It has an inner ring which makes the other end in the axial direction abut on the opening end at the time of attachment.

[0007]

According to the sealing device of the present invention having the above structure,
Since the inner ring comes into contact with the open end of the outer ring at the time of mounting and positioning is performed in the axial direction, there is no need to provide a step on the outer ring, and the inner diameter of the holding portion is increased accordingly. Further, since the holding portion is not bent so as to be separated from the drive shaft or does not caulk the outer ring, plating applied to the surface of the outer ring does not peel off.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

As shown in FIG. 1, the sealing device is fitted to the outer periphery of an open end 21a of an outer race 21 of a universal joint, and has a substantially U-shaped cross section at one axial end toward the inner periphery. An outer ring 1 made of a rigid material provided with a portion 1a; and a boot 2 made of a rubber-like elastic material having an outer peripheral edge 2a inserted into the holding portion 1a. It has an L-shape, and one end 3a in the axial direction is pressed into the holding portion 1a to fix the boot 2 to the outer ring 1 and the other end 3b in the axial direction is brought into contact with the open end 21a of the outer race 21 at the time of mounting. It has an inner ring 3 made of a rigid material.

[0010] In the sealing device having the above-described configuration, at the time of attachment, the inner ring 3 is in contact with the opening end of the outer ring 21 with the other end 3b in the axial direction to perform positioning in the axial direction. Therefore, there is no need to provide a step on the outer ring 1 unlike the prior art shown in FIG. 3 or FIG.
The inner diameter of “a” can be increased, and accordingly, the maximum operating angle θ ₁ of the drive shaft 22 can be increased. Further, as in the prior art disclosed in the above publication, the holding portion 1a is bent so as to be separated from the drive shaft 22, or the outer ring 1 is crimped as in the prior art shown in FIG. 3 or FIG. Therefore, the plating (not shown) applied to the surface of the outer ring 1 does not peel off, and the corrosion resistance of the outer ring can be improved. In addition, since the inside of the outer ring 1 and the boot 2 is filled with grease,
Corrosion is not a problem.

[0011]

[Effects of the Invention] The present invention has the following effects. That is, when the sealing device is mounted, the inner ring has a structure in which the inner ring abuts on the opening end of the outer ring with the other end in the axial direction to perform positioning in the axial direction. Is not necessary, the inner diameter of the holding portion can be increased accordingly, and the maximum operating angle of the drive shaft can be increased. Also, since the holding portion is not bent away from the drive shaft as in the prior art or the outer ring is not caulked, the plating applied to the surface of the outer ring does not peel off, The corrosion resistance of the ring can be improved.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a mounted state of a sealing device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the sealing device.

FIG. 3 is a half cut sectional view showing a mounted state of a sealing device according to a conventional example.

FIG. 4 is a half sectional view showing a mounted state of a sealing device according to another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 1a Holder 2 Boot 2a Outer peripheral edge 3 Inner ring 3a One end in the axial direction 3b The other end in the axial direction 21 Outer ring 21a Open end 22 Drive shaft

Claims (1)

(57) [Scope of request for utility model registration] 1. An open end (2) of an outer ring (21) of a universal joint.
1a), an outer ring (1) provided with a holding portion (1a) having a substantially U-shaped cross section at one end in the axial direction, and an outer peripheral edge (2a).
And a boot (2) inserted into the holding portion (1a).
a) into the holding portion (1a) by pressing it into the boot (2).
Characterized by having an inner ring (3) for fixing the outer ring (1) to the outer ring (1) and abutting the other axial end (3b) to the opening end (21a) at the time of mounting. .