JPH0594575U - Seal fitting structure - Google Patents

Abstract

(57) [Summary] [Purpose] By providing a step to the fitting part of the seal with respect to the housing to protect the elastic body from strong sliding contact, the elastic body is prevented from shearing and has a strong close contact with a strong seal for a long time. Keep your strength. [Structure] A step (6) having a high insertion point (5) is provided on the fitting peripheral surface of the reinforcing ring (3) in the seal (A), and a rubber is provided on the depressed peripheral surface (7) of the step (6). It is characterized in that the elastic body (8) is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seal that is inserted between members that rotate with respect to each other and seals the inside and the outside of the member, and more specifically to a fitting structure in which the seal is mounted.

[0002]

[Prior Art]

 Conventionally, the seal mounted on the rotating part is composed of a seal lip formed of an elastic body and a metal reinforcing ring that reinforces the seal lip.A single or a plurality of these are used, but the fitting part The structure is generally one in which an axial tubular portion formed on the reinforcing ring is fitted into a housing for fixing.

When a high fitting force is required for this fixing, the metal surfaces are directly fitted to each other, but in order to secure the sealing force at that time, the description will be made with reference to the drawings. As in Japanese Patent Laid-Open No. 19512, a small diameter portion (9) is provided on the outer peripheral surface of the reinforcing ring (3), and a viscoelastic plastic material (10) is arranged in the small diameter portion (9) to provide the viscoelastic plastic material (10). The structure which assists the sealing force by the contact pressure of) is implemented.

[0004]

[Problems to be solved by the device]

 However, in the structure in which the viscoelastic plastic material (10) is projected to the outer periphery as described above, it takes time to form the reinforcing ring (3) and to mold the viscoelastic plastic material (10). It is fatal that when this is pressed into the housing (1), the viscoelastic plastic material (10) comes into direct contact with the housing (1) and is largely cut off at its end face, so that the mating surface thereof is However, there is a drawback in that the viscoelastic plastic material (10) is scarcely left and thus a sufficient sealing force cannot be exerted. It is an object of the present invention to eliminate many of these drawbacks, and to provide a gasket having a sealing material that is low in cost and excellent in fitting force and sealing force.

[0005]

[Means for Solving the Problems]

 The present invention will be described with reference to the drawings. As shown in FIG. 1, a seal (A) between a housing (1) and a shaft (2) and fitted to the housing (1) or the shaft (2). ), The seal (A) is composed of a metal reinforcing ring (3) and an elastic sealing portion (4). A step (6) having a high insertion point (5) is provided on the fitting peripheral surface, and a rubber-like elastic body (8) is provided on the depressed peripheral surface (7) of the step (6). .

When the fitting peripheral surface of the step portion (6) and the peripheral surface of the rubber-like elastic body (8) are fitted to the housing (1) of the mating counterpart member, the housing (1) ) Is larger than the inner peripheral surface, and when fitted to the shaft (2), it is formed to have a smaller diameter.

[0007]

[Action]

 The present invention has the above-described structure and performs the following operation. First, in the positional relationship between the housing (1) and the shaft (2) and the seal (A), as shown in FIG. 1, the insertion portion (5) of the seal (A) is a housing ( In the case of 1), both the large diameter and the small diameter in the case of the shaft (2) are strongly fitted, and in the case of fitting into the housing (1) shown in FIG. Even if the diameter of the portion (5) is reduced, the separated outer diameter portion of the rubber-like elastic body (8) following the insertion destination portion (5) does not change, so some inclination angle is added as shown in FIG. A part of the rubber-like elastic body (8) is scraped off by the end portion of the housing (1).

However, as described above, the insertion destination portion (5) in the fitted state in the housing (8) has a reduced diameter, and the rubber-like elastic body (8) arranged in the step portion (6) following it is Due to the step of the diameter, the end face of the housing (1) is not strongly contacted and the shearing force is greatly weakened, so that a large amount of mass remains on the depressed peripheral surface (7) and the fitting is completed while maintaining this state. .

[0009]

Embodiments In carrying out the present invention, the case where the housing (1) is fitted is shown in the above description, but it is also possible to fit the shaft (2) as shown in FIG. The fitting peripheral surface of the stepped portion (6), that is, the peripheral surface of the insertion destination portion (5) and the rubber-like elastic body (8) is formed to have a smaller diameter than the outer peripheral surface of the shaft (2) to obtain a strong fitting force. Due to the positional relationship, if the same insertion and fitting as described above is performed, an accurate and strong mounting effect and a strong sealing effect can be obtained.

[0010]

[Effect of the device]

 According to the present invention, when the seal (A) is fitted, the rubber-like elastic body (8) is not strongly inserted into the housing (1) or the shaft (2), so that it does not receive a large shearing force and is free from peeling or damage. Optimal pressure contact force is applied to the mating member to achieve good sealing for a long time. In addition, since the metal fixing ring (3) whose fitting shape does not change much is fitted and fixed, it is possible to fix the fitting in an accurate positional relationship and prevent variations in sealing performance due to mounting errors.

[0011]

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a seal of the present invention.

FIG. 2 is a sectional view showing a mounted state according to the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a conventional structure not using the present invention.

[0012]

[Explanation of symbols]

 A seal 1 housing 2 shaft 3 reinforcing ring 4 seal part 5 insertion point part 6 step part 7 depressed peripheral surface 8 rubber-like elastic body

Claims (2)

[Scope of utility model registration request] 1. A reinforcing ring (3) made of metal and a seal portion (4) made of an elastic body, which seals the housing (1) and the shaft (2).
And a step portion (6) having a high insertion point portion (5) is provided on the fitting peripheral surface of the reinforcing ring (3) in the seal (A). The structure of the seal fitting portion is characterized in that a rubber-like elastic body (8) is provided on the depressed peripheral surface (7). 2. The housing peripheral surface of the insertion destination portion (5) and the peripheral surface of the rubber-like elastic body (8) are fitted to the housing (1) of a mating member. The seal fitting structure according to claim 1, wherein the seal fitting structure has a larger diameter than (1) and is formed to have a smaller diameter when fitted to the shaft (2).