JP2508443Y2 - Seal fitting structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal which is inserted between members which 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]

2. Description of the Related Art Conventionally, a seal mounted on a rotating portion is composed of a seal lip formed of an elastic body and a metal reinforcing ring for reinforcing the seal lip, and a single or a plurality of these are used in combination. The structure of the fitting portion is generally one in which the tubular portion in the axial direction formed on the reinforcing ring is fitted into the housing to be fixed.

When a high fitting force is required in this fixing, the metal surfaces are directly fitted to each other, but in order to secure the sealing force at that time, a description will be given with reference to the drawings, and the actual public view 39-19512 shown in FIG. 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 that assists the sealing force by the contact pressure is implemented.

[0004]

However, in the structure in which the viscoelastic plastic material (10) is projected to the outer periphery as described above, the viscoelastic plastic material (1) is formed even when the reinforcing ring (3) is formed.
(0) is time-consuming and, even more fatally, when it is pressed into the housing (1), the viscoelastic plastic material (10) directly contacts the housing (1) and most of the end surface is cut off. Therefore, there is a drawback that a sufficient sealing force cannot be exerted because the viscoelastic plastic material (10) remains only slightly on the fitting surface. It is an object of the present invention to eliminate many of these drawbacks and to provide a gasket of a sealing material that is low in cost and excellent in fitting force and sealing force.

[0005]

The present invention will be described with reference to the drawings. As shown in FIG. 1, it is located between a housing (1) and a shaft (2), and the housing (1) or the shaft (2). ) to have a structure of the seal fitting portion to be fitted, the seal (a) is composed of metal reinforcing rings (3) an elastic body made of the seal portion (4), the seal (a) A stepped portion (6) having a high insertion tip portion (5) is provided on the peripheral surface of the flat tubular fitting portion of the reinforcing ring (3), and a rubber is provided on the depressed peripheral surface (7) of the stepped portion (6). The elastic body (8) is characterized by being fixed .

The diameters of the fitting peripheral surface of the stepped portion (6) and the peripheral surface of the rubber-like elastic body (8) are determined by the housing of the mating member.
The diameter is larger than the inner peripheral surface of the housing (1) when it is fitted to the shaft (1), and conversely it is small when it is fitted to the shaft (2).

[0007]

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 destination portion (5) of the seal (A) is closer to the housing (1) than the mating peripheral surface of the mating member. In the case of () , a large diameter is used , and in the case of the shaft (2), a small diameter is used , and both are in a tight fitting relationship. In the case of fitting into the housing (1) shown in FIG. Even if the part (5) is reduced in diameter, it is hidden in the insertion destination part (5).
Since the outer diameter portion does not change in the rubber-like elastic body (8) followed by, marked with some inclination angle as shown in FIG. 2, the reinforcing ring
The surface portion of the rubber-like elastic body (8) fixed to (3) 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 the insertion destination portion (5) is Due to the step of the diameter, the end face of the housing (1) is not strongly contacted and its shearing force is significantly 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]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the above description of the present invention, the case of fitting into the housing (1) was shown, but it is also possible to fit into 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. If the insertion and fitting similar to the above is performed from the positional relationship, the accurate and strong mounting effect and the strong sealing effect can be obtained. The fitting part of the reinforcing ring (3) is
Limited to a flat cylinder due to its shapeability and surface pressure retention
And the recessed peripheral surface (7) provided on the flat cylindrical peripheral surface.
As a result, a proper amount of rubber-like elastic material is secured on the fitting peripheral surface to ensure good sealing.
It will exhibit sealing performance.

[0010]

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 the rubber-like elastic body (8) does not receive a large shearing force and peels off. spared from damage, it forms a long-term good seal exerts an optimum pressure contact force to the mating member. In addition, the fixed metal fitting ring (3) that is fitted and fixed has a flat tubular shape with little change in fitting shape.
As a result, it is possible to fix them while maintaining an accurate positional relationship, and prevent variations in sealing performance due to mounting errors.

[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)

(57) [Scope of utility model registration request] 1. A reinforcing ring (3) made of metal and a sealing portion (4) made of an elastic body, which seals the housing (1) and the shaft (2).
A seal fitting structure comprising: a flat tubular shape of the reinforcing ring (3) in the seal (A).
A step portion (6) having a high insertion point portion (5) is provided on the peripheral surface of the fitting portion, and a rubber-like elastic body (8) is provided on a depressed peripheral surface (7) of the step portion (6).
Structure of the seal fitting portion, characterized in that it allowed securing. 2. When the fitting 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 the mating member, the housing peripheral surface ( 1) The diameter of the seal fitting portion is larger than that of 1) and is smaller than that of the shaft (2) when fitted to the shaft (2).
Build .