JP2546475Y2 - Sealing device for constant velocity joints - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a sealing device for a constant velocity joint for a propeller shaft.

[0002]

2. Description of the Related Art In general, a continuous portion of a propeller shaft in an automobile is, as shown in FIG.
A constant velocity joint 10 is incorporated between the propeller shaft 1 and the companion flange 2 for transmitting the driving force from the transmission to the shaft 1. The constant velocity joint 10 absorbs relative movement between the propeller shaft 1 and the companion flange 2.

The sliding portion of the constant velocity joint 10 is lubricated by grease sealed therein. In order to prevent the grease from leaking outside and to prevent foreign matter from entering the joint, metal covers 13 and 14 having flanges 12 on the outer diameter side on both sides of the outer ring 11 of the constant velocity joint 10. Attach the cover 1 on the shaft 1 side
A boot 15 is attached to the opening 4 so as to close the openings on both sides of the constant velocity joint 10. Further, in order to surely prevent oil outflow during high-speed rotation, the covers 13 and 14 and the outer ring 1
6, a packing 16 made of rubber is assembled, and the packing 16 is brought into close contact with the side surface of the outer ring 11 and the inner surfaces of the covers 13 and 14 by tightening a bolt 17 screwed into the companion flange 2 as shown in FIG. The facing surfaces of the outer ring 11 and the covers 13 and 14 are sealed.

As shown in FIG. 7, the packing 16 has a notch 19 'for inserting a bolt on its outer periphery, so that the notch 19' is formed on the outer race 11 at the time of assembly. It is necessary to accurately position the packing 16 so as to coincide with the insertion hole 19. But,
Since the packing 16 is thin and thick and has flexibility, it is extremely difficult to position the packing 16. Moreover, it cannot be confirmed from the appearance whether the packing 16 is tightened at a correct position. There is a problem that various jigs are required for this.

[0005] In order to solve such a problem, there has already been proposed one in which a packing 16 is baked (cured) on the inner surfaces of the covers 13 and 14.

[0006] When the packing 16 is baked, a method is adopted in which the covers 13 and 14 are placed in a mold and molten rubber is pressed into the cavity of the mold.

[0007]

Since the packing 16 is extremely thin and thick, it is necessary to provide a gate for injecting the molten rubber into the cavity at a position facing the sealing surface of the packing 16.

For this reason, when the mold is opened after the packing is baked and the product is taken out, the molten rubber remaining in the gate is cut off, and as shown in FIG.
The burrs 21 remain on the seal surface 2 due to the burrs 21.
0 did not adhere to the side surface of the outer ring 11, and there was a problem in the reliability of the seal.

It is a technical object of the present invention to improve the sealing performance of a sealing device for sealing by sealing a packing baked on a cover to a side surface of an outer ring of a constant velocity joint.

[0010]

In order to solve the above-mentioned problems, in the present invention, a notch is formed on a seal surface which is in close contact with a side surface of an outer ring of a packing baked on an inner surface of a cover. A configuration was adopted in which the bottom surface was opposed to the gate of the packing mold.

[0011]

As described above, since the bottom of the notch is the opposite surface of the gate, even if molten rubber remaining in the gate is cut and burrs remain on the product, the burrs are located in the notch, so that the sealing property is maintained. Does not affect anything.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 2 and FIG.
The packing 16 is baked on the inner surface of the.

When the cover 14 is screwed to the outer ring 11, the packing 16 is in close contact with the side surface of the outer ring 11 to seal the opposing surface between the outer ring 11 and the cover 14.

A plurality of notches 18 are formed in the inner diameter of the sealing surface 20 which is in close contact with the outer ring side surface of the packing 16, and the bottom surface 22 of the notch 18 is in contact with the facing surface of the gate of the mold for molding the packing. Have been.

Here, the bottom surface 22 of the notch 18 is
The plane may be a plane parallel to the sealing surface 20 as shown in FIG. 4A, or may be an inclined plane inclined with respect to the sealing surface 20 as shown in FIG.

When the packing 16 is baked, the cover 14 is placed in a packing molding die and molten rubber is pressed into a cavity from a gate formed in the die, as in the prior art. After molding the packing, open the mold,
The molten rubber remaining at the gate is cut, and burrs remain on the packing 16.

In the present invention, the bottom surface 2 of the notch 18
Since 2 is the surface facing the gate, FIG.
As shown in (b), the burr 21 remains on the bottom surface 22.

Therefore, at the time of assembling the cover 14 shown in FIG. 1, the burr 21 does not impair the sealing performance, and the packing 16 can seal the space between the opposing surfaces of the cover 14 and the outer ring 11 satisfactorily.

4 (a) and 4 (b), the notch 22 is formed in the inner diameter of the sealing surface 20 of the packing 16.
As shown in FIG. 5A, a notch 18 may be formed at the center in the width direction of the sealing surface 20, or may be provided at the outer diameter of the sealing surface 20 as shown in FIG. .

In the embodiment, the cover 14 on the shaft 1 side has been described as an example, but the notch 18 is also provided on the packing 16 of the cover 13 on the companion flange side.

[0022]

As described above, in the sealing device according to the present invention, the notch is formed on the sealing surface of the packing baked on the cover, and the burr is left on the bottom surface of the notch. The seal between the cover and the opposing surface of the outer ring can be satisfactorily sealed without being interposed between the packing and the side surface of the outer ring.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of a sealing device according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a part of the above cover.

FIG. 3 is a left side view of FIG. 2;

FIGS. 4 (a) and 4 (b) are cross-sectional views showing examples of the above packing.

FIGS. 5 (a) and 5 (b) are cross-sectional views showing another example of the same packing.

FIG. 6 is a sectional view showing a conventional sealing device.

FIG. 7 is a side view of the cover of FIG. 6;

FIG. 8 is a sectional view of a conventional packing.

[Explanation of symbols]

 Reference Signs List 10 constant velocity joint 11 outer ring 14 cover 16 packing 17 bolt 20 sealing surface 18 notch 22 bottom

Claims (1)

(57) [Scope of request for utility model registration] 1. A constant velocity joint for fixing a cover to a side surface of an outer ring of a constant velocity joint by tightening bolts, and sealing a baked packing on an inner surface of the cover to a side surface of the outer ring to seal a gap between the outer ring and a facing surface of the cover. A sealing device for a constant velocity joint, wherein a notch is formed in a sealing surface in close contact with an outer ring side surface of the packing, and a bottom surface of the notch is formed as a surface facing a gate of a packing mold.