JPH0749138Y2 - Sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a sealing device such as an oil seal, and more particularly to a seal structure for an outer peripheral fitting portion.

(Prior Art) Conventionally, as a sealing device of this type, for example, there is one shown in FIG. The illustrated device is a so-called outer peripheral metal type oil seal, and the outer peripheral fitting portion 101 of the main body 100 of the device is fitted to the inner periphery of the mounting hole 103 of the housing 102. Such a peripheral metal type has an advantage that the fitting force is large due to the metal fitting and the positioning is easy, but on the other hand, since the metal is in contact with each other, the contact surface is fine. It is difficult to completely seal the fitting part due to such irregularities.

In order to improve the sealing performance of the outer peripheral fitting portion, a flange 104 that engages with the end surface of the housing 102 is provided at one end of the outer peripheral fitting portion 101, and the rubber 104 is provided in the housing 104.
5 or by turning the flange 104 as shown in FIG.
The projection 106 was provided on the end face.

(Problems to be solved by the invention) However, in the case of the above-described conventional technique, the device main body 100 is mounted on the housing 102 by mounting the device main body 100 on the housing.
This is done by driving in the mounting hole 103 of 102 in the axial direction and press-fitting. At that time, the driving was incomplete and the flange 10
If the 4 and the end surface of the housing 102 are not in close contact with each other, the hermeticity cannot be ensured and internal oil will leak. In addition, the metal portion may rust due to water or the like infiltrating from the outside, resulting in a decrease in durability. Therefore, the flange 104 of the device main body 100 is
It was necessary to press-fit completely until it came into close contact with the end face of 102, and assembly work was also difficult.

On the other hand, as another example of sealing the outer peripheral portion, it is known to coat the metal fitting surface of the outer peripheral fitting portion with a sealing material, but there is a problem that cost increase cannot be avoided.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to improve the outer peripheral sealing property while taking advantage of the holding force of metal fitting and the ease of positioning. Another object of the present invention is to provide a sealing device that can be assembled and can be easily assembled.

(Means for Solving the Problem) In order to achieve the above object, a cylindrical outer peripheral fitting portion that is fitted to the inner periphery of a mounting hole of a housing and is reinforced by a metal ring is provided, and the outer peripheral fitting portion A seal lip, which is in sliding contact with the shaft, is integrally provided on the circumferential side, and a flange which is engaged with the housing end surface at one end on the atmosphere side of the outer peripheral fitting portion and extends outward in the radial direction is reinforced by the metal ring. In a sealing device having a device body, the flange is provided with an end face lip that is in sealing contact with the housing end face and is inclined with respect to the axial direction and has flexibility, and further has a rigidity higher than that of the end face lip. ,
Further, there is provided a stopper convex portion that is short in the axial direction and protrudes toward the housing end surface side and comes into contact with the housing end surface when the apparatus body is mounted on the housing.

(Operation) Thus, the outer peripheral fitting portion of the device body fitted into the inner periphery of the mounting hole of the housing is sealed by the end surface lip that contacts the end surface of the housing.

Further, even if the driving amount when assembling the apparatus main body varies, the variation is absorbed by the bending of the end face lip, and good sealing performance is maintained. Furthermore, while preventing seal leakage from the outer peripheral fitting portion, the convex portion acts as a stopper even when the device body is completely press-fitted into the housing mounting hole, and the end face lip is not crushed, so the end face lip is damaged. Can be prevented.

In addition, the contact state of the end face lip may vary, so the axial positioning of the sealing device body may be incomplete. The axial position of can be ensured.

(Example) Below, this invention is demonstrated based on the Example shown in figure. 1 and 2 showing a sealing device according to an embodiment of the present invention, reference numeral 1 denotes a device body of the sealing device. The apparatus main body 1 is generally composed of an outer peripheral fitting portion 4 that is closely fitted to the inner peripheral surface of the mounting hole 3 of the housing 2, and a seal lip 6 that is provided on the inner diameter side and sealingly contacts the shaft 5. A flange 7 that engages with the end surface 21 of the housing 2 is provided at one end of the fitting portion 4.

The outer peripheral fitting portion 4 is composed of a cylindrical metal ring 8, and the outer peripheral surface of the metal ring 8 is brought into direct contact with the inner peripheral surface of the mounting hole 3 of the housing 2 to be fitted therein.

The metal ring 8 is an outer cylinder portion 81 fitted to the inner circumference of the housing 2.
And an inner cylinder portion 82 of approximately half the length of the outer cylinder portion 81 folded back from the sealed fluid side O end edge of the outer cylinder portion 81 toward the atmosphere side A, and the atmosphere side A side edge of the inner cylinder portion 82. Is bent inward in the radial direction from which the seal lip 6 is fixed by baking.
Further, the flange 7 is bent and extends outward in the radial direction from the edge of the outer tubular portion 81 on the atmosphere side A side.

The metal ring 8 is covered with a rubber material 9 from the inner circumferential side of the outer tubular portion 81 and the atmosphere side surface of the flange 7 to the sealed fluid side O side surface facing the housing end surface 21.

Then, on the O-side surface of the flange 7 on the sealed fluid side, that is, on the surface facing the housing end surface 21, an end surface lip made of a rubber-like elastic material in which the lip tip 11 makes sealing contact with the housing end surface 21.
Ten are provided.

The end surface lip 10 extends so as to increase in diameter toward the axially sealed fluid side O, and the lip tip 11 is adapted to contact the housing end surface 21 at its inner edge.

Further, in this embodiment, a protrusion 12 for a stopper that restricts the amount of bending of the end lip 10 is provided on the inner side in the radial direction of the base position of the end lip 10. The tip of the protrusion 12 contacts the housing end surface 21 to regulate the gap between the flange 7 and the housing end surface 21 to a predetermined amount.

Further, the length of the skin covering rubber material 9 radially outside the base position of the end face lip 10 is thin, and a recess 13 is formed between the end face lip 10 and the skin covering rubber material 9 for allowing the deflection of the lip 10 to escape. Has been done.

In this embodiment, the inclination direction of the end surface lip 10 is inclined so as to increase the diameter toward the axial sealing fluid side O, but conversely the diameter decreases toward the axial sealing fluid side O. You may make it incline to a direction. Also, the end face lip 10
Although the example in which only one is provided is shown, the number is not limited to one, and a plurality may be formed.

Next, the operation of the sealing device having the above configuration will be described.
The device body 1 is assembled to the housing 2 by driving the outer peripheral fitting portion 4 of the device body 1 into the inner periphery of the mounting hole 3 of the housing 2 and press-fitting.

Here, the metal surface is exposed at the outer circumference of the outer cylinder portion 81 of the metal ring 8 which is the outer peripheral fitting portion 4, and the metal is fitted to the housing 2.

Therefore, the device body 1 is accurately positioned with respect to the mounting hole 3 of the housing 2, and the contact surface pressure of the seal lip 6 with the shaft 5 is uniformly set in the circumferential direction. Further, since the outer peripheral fitting portion 4 comes into contact with the metal, the contact surface pressure becomes large, and the outer tubular portion 81 is firmly fixed to the housing 2.

After the assembly, the end face lip 10 provided on the flange 7 sealingly contacts the housing end face 21, and the sealing fluid leaking from the outer peripheral fitting portion 4 is sealed by the end face lip 10.

In addition, foreign matter such as moisture from the outside can also be used for this end face lip 10.
The seal is sealed by, and the permeation of water etc. into the outer peripheral portion is prevented. Therefore, durability can be improved without fear of rusting.

In particular, in this embodiment, the end surface lip 10 is inclined toward the atmosphere side A, which is suitable for preventing foreign matter from entering from the outside.

In addition, even when the driving amount of the apparatus body 1 varies when the apparatus body 1 is assembled, the end face lip is changed according to the variation.
The flexure of 10 causes the contact state of the lip tip 11 with the housing end surface 21 to be maintained, and good sealing performance is maintained. Therefore, it is not necessary for the flange 7 to be completely in contact with the housing end surface 21 when the device body 1 is assembled, and the assembling work can be facilitated.

Further, in this embodiment, since the convex portion 12 for the stopper is provided adjacent to the end face lip 10 and the concave portion 13 for allowing the deflection of the lip 10 to escape, the apparatus main body 1 is completely press-fitted. Even in such a case, as shown in FIG. 4, the end face lip 10 is allowed to escape into the recess 13 and the end face lip 10 can be prevented from being damaged.

Although the oil seal has been described as an example in the above embodiment, the present invention is not limited to the oil seal.
Any device can be applied as long as it is a device in which the outer peripheral fitting portion fitted in the housing is made of a metal surface.

(Effects of the Invention) The present invention has the above-described configuration and operation. Since the flange provided on the main body of the apparatus is provided with the end face lip that makes sealing contact with the end face of the housing at the time of assembly, the seal from the outer peripheral fitting portion Leakage can be prevented. Further, it is possible to prevent water and the like from entering from the outside, prevent rusting of the metal portion, and improve durability.

Furthermore, since the end face lip for sealing has flexibility in the axial direction, it is possible to largely allow variations in driving when assembling the apparatus main body and to improve the assembling property. Further, even when the main body of the apparatus is completely press-fitted into the housing mounting hole, the convex portion acts as a stopper and the end face lip is not crushed, so that the end face lip can be prevented from being damaged.

In addition, the contact state of the end face lip may vary, so the axial positioning of the sealing device body may be incomplete. The axial position of can be ensured.

[Brief description of drawings]

1 is a longitudinal sectional view of a main part of a sealing device according to an embodiment of the present invention, FIG. 2 is a vertical sectional view of a main part of an assembled state of the device of FIG. 1, and FIG. 3 is an end surface of FIG. Enlarged cross-sectional view of the lip, 4th
2 is an enlarged cross-sectional view of the end face lip portion of the apparatus main body of FIG. 2 in a completely press-fitted state, and FIGS. 5 and 6 are vertical cross-sectional views of main parts of a conventional sealing device. Explanation of symbols 1 ... Device main body, 2 ... Housing 21 ... Housing end face, 3 ... Mounting hole 4 ... Outer peripheral fitting portion, 5 ... Shaft 6 ... Seal lip, 7 ... Flange 8 ... Metal Ring, 81 ... Outer cylinder part 9 ... Rubber material, 10 ... End lip 11 ... Lip tip, 12 ... Convex part 13 ... Recessed part A ... Atmosphere side, O ... Sealed fluid side

Claims (1)

[Scope of utility model registration request] 1. An inner circumference of the mounting hole (3), which is arranged between a housing (2) and a shaft (5) arranged in the inner circumference of the mounting hole (3) to seal the housing. Has a cylindrical outer peripheral fitting portion (4) which is fitted to the outer peripheral fitting portion and is reinforced by a metal ring, and a seal lip (6) slidingly contacting the shaft (5) is integrally formed on the inner peripheral side of the outer peripheral fitting portion. Provided, said outer peripheral fitting portion (4)
(7) that engages with the housing end surface (21) at one end on the atmosphere side and extends radially outwardly and is reinforced by the metal ring
A sealing device having a device body (1) including: an end face lip (10) which is in sealing contact with the housing end face (21) and extends at an inclination with respect to the axial direction and has flexibility. ) Is provided, the rigidity is larger than that of the end face lip (10), and the end face of the device is shortly projected toward the housing end face side in the axial direction and abuts on the housing end face when the device body (1) is mounted on the housing. A sealing device having a protrusion (12) for a stopper.