Sealing device

a sealing device and sealing technology, applied in the direction of engine sealing, shaft and bearing, bearing components, etc., can solve the problems of grease resistance property and grease holding property decrease, and achieve the effect of stabilizing sealing properties, reducing angle fluctuation, and strengthening rigid sealing lip rigidity

Inactive Publication Date: 2005-12-08
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The present invention has been made in view of the above-described conventional art, and an object thereof is to provide a sealing apparatus with improved grease resistance property.
[0014] Therefore, the grease resistance property is improved because the sectional shape of the sealing lip prevents leakage of grease in the inside.
[0017] This prevents occurrence of a defect such as lip inversion caused by generation of inner pressure because the extending direction of the sealing lip is at the middle of the inner side and the open-air side or tilted to the open-air side.
[0020] This prevents penetration of dusts, whereby the sealing property can be enhanced to a greater extent.
[0022] This enhances the rigidity of the sealing lip, restrains the fluctuation of the angles of the inner side contact angle and the open-air side contact angle caused by deformation of the sealing lip, and can stabilize the sealing property. Also, enhancement of the rigidity of the sealing lip further prevents occurrence of a defect such as inversion of the lip caused by generation of inner pressure.
[0023] In the present invention, since the sealing lip is provided to have a larger inner side contact angle which is an angle not smaller than the open-air side contact angle, the sectional shape of the sealing lip prevents leakage of grease in the inside, whereby the grease resistance property is improved.

Problems solved by technology

However, the above-described conventional art causes decrease of the grease holding property (grease resistance property) though filling of grease can be confirmed by leakage of the grease from sealing lip 104.

Method used

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Experimental program
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first embodiment

[0031] Hereafter, a first embodiment will be described with the use of FIGS. 1 to 2. FIG. 1 is a half sectional view illustrating a sealing apparatus 1 and a peripheral portion thereof according to the first embodiment. FIG. 2 is a half sectional view illustrating the sealing apparatus 1 according to the first embodiment.

[0032] In a propeller shaft (universal joint) of FIG. 1, an end portion of a cross shaft 12 is inserted and fitted to a cylindrical cap 11 having a bottom. A plurality of needle-shaped bearings 13 are rotatably arranged between the outer periphery of the end portion of cross shaft 12 and the inner periphery of cap 11.

[0033] Grease supply that supplies grease by providing a passage way in cross shaft 12 is carried out in this bearing 13.

[0034] Then, sealing apparatus 1 is arranged in an annular gap between the inner periphery of the open end portion of cap 11 and the outer periphery of cross shaft 12 with this bearing 13 side serving as an inner side I. Then, the ...

second embodiment

[0045] In the above-described first embodiment, description has been given on a case in which the inner side contact angle α is an angle equivalent to the open-air side contact angle β (α=β); however, the present invention is not limited to this, and similar effects can be displayed if it is satisfied that the inner side contact angle α is an angle not smaller than the open-air side contact angle β (α≧β).

[0046] Namely, in addition to the above-described embodiment, as the one that prevents occurrence of a defect such as lip inversion caused by generation of inner pressure, similar effects can be displayed if it is satisfied that the extending direction of sealing lip 4 is tilted not less to the open-air side A than the middle of the inner side I and the open-air side A.

[0047] As a second embodiment, FIG. 3 illustrates one that is provided to be a so-called inverse offset lip in which the inner side contact angle α of the tip end of sealing lip 4 is an angle larger than the open-ai...

third embodiment

[0051] In addition to the above-described embodiments, as the one that prevents occurrence of a defect such as lip inversion caused by generation of inner pressure, further effects can be displayed if it is satisfied that the inner side contact angle α is equal to the open-air side contact angle β (α=β) and the direction of sealing lip 4 extending from a base is at the middle of the inner side I and the open-air side A.

[0052] As a third embodiment, FIG. 4 illustrates one in which the inner side contact angle α and the open-air side contact angle β of sealing lip 4 are the same angle (α=β), and sealing lip 4 extends to the tip end from the base connected to attachment portion 2 so as to be provided as a so-called triangular lip from the base. FIG. 4 is a half sectional view illustrating a sealing apparatus 1 according to the third embodiment. Here, in the third embodiment, the same constituents described in the above embodiments will be denoted with the same symbols, and the descrip...

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Abstract

A sealing apparatus capable of increasing a grease resistance property, wherein the tip of a sealing lip is formed so that an inner side contact angle α is equal to an open-air side contact angle β (α=β), that is, formed in a triangular shape to prevent grease inside the apparatus from leaking so as to increase the grease resistance property, and since the extending direction of the sealing lip is set at a middle of an inner side and an open-air side, a trouble such as the inversion of the sealing lip due to the occurrence of an inner pressure does not occur.

Description

TECHNICAL FIELD [0001] The present invention relates to a sealing apparatus that is used, for example, for a propeller shaft (universal joint) of a driving transmission shaft for a vehicle or the like. BACKGROUND ART [0002] Conventionally, those applied as this type of sealing apparatus are described in patent document 1 (Japanese Patent Application Laid-open No. 11-125338) and patent document 2 (Japanese Patent Application Laid-open No. 2002-98163). [0003] Particularly, as a specific example of one such as described in patent document 2, there is one shown in FIG. 5 (See FIG. 2 of patent document 2). FIG. 5 is a half sectional view of a sealing apparatus 101 according to a conventional art. [0004] In FIG. 5, sealing apparatus 101 is arranged between a cap into which an end portion of a cross shaft is inserted and fitted and the end portion of the cross shaft. [0005] Sealing apparatus 101 has an attachment portion 102 attached to the cap. A metal ring 103 is integrally formed on the...

Claims

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Application Information

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IPC IPC(8): F16J15/32F16C33/78
CPCF16C33/7809F16J15/3232F16C33/7876F16C2361/41F16J15/32
InventorMATSUI, HIROKI
OwnerNOK CORP