JPS6121642Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sealing device that is used for a shaft having a large diameter portion and a small diameter portion, and in which the sealing sliding portion is inserted into the small diameter portion beyond the large diameter portion during assembly. The present invention provides a sealing device that is easy and safe to install and has reliable sealing performance.

Conventionally, in automobile propeller shafts,
Spline joints are used to enable variable shaft length and reliable torque transmission. As illustrated in the figure, a gasket 4 made of felt or the like and having protrusions that fit the spline groove arranged on the inner circumferential side, a restraining plate 5 having similar protrusions arranged on the inner circumferential side, and an L-shape. It is bent to show a cross-sectional shape of
A mounting ring 6 having similar protrusions arranged on its inner circumference is fitted onto the through shaft 1 which is splined outwardly.
The gasket 4 is pressed by the mounting ring 6 through the holding plate 5, and the mounting ring 6 is fixed to the end of the penetrated member 2 by welding, caulking, etc., and is brought into sliding contact with the penetrating shaft 1. It is widely known that a gasket 4 is used to provide a sealing effect, but this type of sealing means is troublesome and costly to manufacture, and the assembly process requires aligning the inner protrusions of each member with the splines. This method requires a step to remove foreign matter from the outside, which is somewhat complicated, and also does not necessarily have a sufficient function of preventing foreign matter from entering from the outside at the sliding fitting portion between the packing and the penetrating shaft. In a typical sealing device that is made of a rubber-like elastic material and has a sealing lip inside, the part that connects to the splined part of the penetrating shaft and makes sliding contact with the sealing lip has a smaller diameter than the splined part; During assembly, it was difficult to ensure that the seal lip part went over the large diameter part to reach the small diameter part and maintain appropriate contact pressure against the circumferential surface of the small diameter part, so this example was not actually used. There aren't many.

In view of the problems with the sealing device according to the prior art described above, the present invention includes a sealing device including a sealing member made of a rubber-like elastic material, the sealing member being fixed to the penetrated side member, and a sealing pressure being applied to the sealing member. A fixing member made of a metallic material or a synthetic resin material to be attached, and a mounting base that is fitted into the member to be penetrated, and a sealing part that extends in the axial direction from the mounting base and has a seal lip on the inner circumferential side. The fixing member has a structure in which the fixing member is fitted onto the outer periphery of the sealing member that is inserted into the end of the penetrated side member, and the outer covering part extends from the outer covering part and is inserted into the sealing part of the sealing member to form a seal. The inner diameter of the seal lip of the sealing part is smaller than the outer diameter of the large diameter part of the penetrating shaft in the free state before being combined with the fixing member. , is slightly smaller than, equal to, or slightly larger than the outer diameter of the small diameter portion of the penetrating shaft when fitted with the fixing member; Do not extrapolate and keep the inner diameter of the seal lip large.
After inserting the seal member onto the through shaft and letting the seal lip pass through the large diameter part and reach the small diameter part,
The fixing member is inserted externally, and the outer periphery of the seal portion is pressed against the support portion to reduce the diameter, so that the seal lip is brought into pressure contact with the circumferential surface of the small diameter portion of the penetrating shaft, thereby producing a sealing function.

Hereinafter, the structure and the process before and after assembly of an embodiment of the sealing device according to the present invention will be explained with reference to the drawings. In the embodiment shown in FIGS. 2 to 4, a sealing member 10 made of a rubber-like elastic material is connected to a mounting base 11 that is fitted and locked to the end of the penetrated member 2, and a truncated conical shape from the mounting base 11. A fixing member 2 shown in FIG.
0, the inner diameter of the seal lip 13 is made to be slightly smaller, equal to, or slightly larger than the outer diameter of the large diameter portion 16 of the through shaft on which the spline has been cut. The fixing member 20 includes an outer covering part 21 that can be fitted onto the mounting base 11 of the sealing member 10, and a support part 2 that is connected to the end of the outer covering part 21 and has a truncated conical shape.
3, the support portion 23 has a slope that is slightly steeper than that of the truncated conical portion of the seal portion 12 of the seal member 10, and the support portion 23 of the outer covering portion 21
An appropriate number of bendable locking claws 24 are provided at the opposite end. The assembly of this embodiment is performed according to the following procedure. First, as shown in FIG. 2, the seal member 10 is positioned on the small diameter portion 17 of the penetrating shaft 1 of the fixing member 20, and the mounting base 11 is fitted to the outer circumference of the penetrating side member 2, and the penetrated side Part 2
The combination is inserted onto the penetrating shaft 1 while expanding the seal lip 13 to such an extent that it does not contact the circumferential surface of the large diameter portion 16, and the sealing member 10 is passed through the large diameter portion 16, as shown in FIG. As shown in FIG.
is inserted into the outside of the sealing member 10, and the supporting part 23
presses the seal portion 12 and seal lip 13
is brought into pressure contact with the circumferential surface of the small diameter portion 17, and the locking pawls 24 attached to the ends of the outer cover portion 21 are bent to securely connect each member to complete the assembly.

In another embodiment shown in FIG.
An elastic auxiliary member 2 is made of a synthetic resin material or a metal plate material having elasticity on the outside of the seal portion 12 in order to ensure the pressure contact force, and has a truncated conical shape.
9 is used, and the seal member 10 and the penetrated member 2 are fixed together by an annular groove formed on the circumferential surface of the penetrated member 2 and an annular protrusion provided inside the seal member 10. Everything else is the same as the embodiment shown in FIGS. 2-4. 6th
7 and 7 show another embodiment of the fixing member 20, in which a coupling tongue piece 26 is attached to one side of the fixing member 20 which is divided into two parts, and a coupling collar part 27 is attached to the other side. Then, the coupling tongue piece 26 is inserted into the hole provided in the coupling collar part 27, and the coupling tongue piece 26 is bent as shown by the dotted line in the figure to be coupled.

Since the sealing device of the present invention includes the above-described components, the following effects are brought about. The sealing member 10 is made of a rubber-like elastic material, and the sealing lip 13 is in sliding contact with the circumferential surface of the small diameter portion 17 of the penetrating shaft 1 while maintaining an appropriate contact pressure, so that the sealing function is ensured. Since the inner diameter of the seal lip 13 of the seal member is approximately equal to that of the large diameter portion 16 of the penetrating shaft 1 in the free state, it expands slightly outward during assembly so that the tip edge The support part 23 can be safely attached without being damaged, and the fixing member 20 has a truncated conical shape.
By compressing the seal portion 12 inwardly, it is possible to appropriately set the pressing force of the seal lip 13 against the circumferential surface of the small diameter portion 17, and it is possible to use the elastic auxiliary member 29. As a result, support of the support portion 23 to the seal portion 12 is maintained more reliably. In addition, by bending the locking claw 24 or the coupling tongue 26 of the fixing member 20, each member can be easily and firmly coupled to each other.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a sealing device according to the prior art, Figs. 2 to 4 are sectional views showing an embodiment of the sealing device according to the present invention, and Fig. 5 is a perspective view showing an example of a sealing device according to the present invention. FIGS. 6 and 7 are a sectional view showing an embodiment, and a side view and a rear view showing other embodiments of the fixing member of the sealing device according to the present invention. DESCRIPTION OF SYMBOLS 1... Penetrating shaft, 2... Passed member, 4... Gasket, 5... Holding plate, 6... Mounting ring, 10...
... Seal member, 11 ... Mounting base, 12 ... Seal part, 13 ... Seal lip, 16 ... Large diameter part,
17... Small diameter portion, 20... Fixing member, 21...
Outer cover part, 23... Support part, 24... Locking claw, 26
...Connecting tongue piece, 27...Connecting flange, 29...
Elastic auxiliary member.

Claims (1)

[Scope of utility model registration request] A mounting base 11 and a seal portion 1 extending from the mounting base 11 and having a seal lip 13 attached to the inner end thereof.
2, a sealing member 10 made of a rubber-like elastic material that is penetrated by the penetrating shaft 1 having a large diameter portion 16 and a small diameter portion 17, and an outer covering portion 2 that covers the mounting base 11.
1 and a support part 23 into which the seal part 12 is fitted, and a fixing member 20 which is fitted onto the seal member 10.
substantially equal to the outer diameter of the large diameter portion 16 when not combined with each other, and smaller than the outer diameter of the small diameter portion 17 when the sealing member 10 and the fixing member 20 are combined with each other. A sealing device characterized by: