JPH0710132Y2 - Sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a sealing device used for separating different types of fluids.

(Prior Art) A conventional sealing device of this type is shown in FIG. In the figure,
Reference numeral 100 denotes a sealing device which separates the high-pressure fluid a side and the low-pressure fluid b side, and is formed by integrally molding a rubber-like elastic body 101 and a metallic reinforcing member 102. The outer peripheral surface of the rubber-like elastic body 101 is fitted to the inner peripheral surface of the housing 103, and lip portions 105 and 106 that contact the outer peripheral surface of the rotating shaft 104 are formed on the inner peripheral side. The lip portion 105 formed on the high-pressure fluid a (eg, air) side is baked with a tetrafluoroethylene resin 105a having excellent wear resistance and heat resistance.
Wear of 105 is prevented.

In addition, 107 is another sealing device provided between the high-pressure fluid side a and the atmosphere d side to prevent the high-pressure fluid from leaking to the atmosphere d side. The sealing device 107 includes a rubber-like elastic body 108, a metal reinforcing member 109, and a spring 110.

(Problems to be solved by the invention) However, in the sealing device 100, the lip portion 1
The ethylene tetrafluoride resin 105a baked on 05 does not have a sufficient sealing force against air. Therefore, when the sealing device 100 is molded, the base portion 101a of the rubber-like elastic body 101 to the lip portion 105.
A resin ring is integrally provided on the base end of the lip 105
Although it is possible to contact the rotating shaft with the rotating shaft, the base portion 101a becomes thicker and the lip portions 105 and 106 become longer in the axial direction. It is not practical because it exists.

Therefore, the rubber-like elastic body 101 is divided into two parts, one of which is provided with a lip portion, a resin ring, and a reinforcing member, and the other of which is provided with a lip portion and a reinforcing member.
It is possible to mount them back-to-back within 3, but this is not preferable because the mounting space in the axial direction becomes wider.

The present invention is intended to solve the above problems, and an object thereof is to provide a sealing device in which the first sealing member and the second sealing member are integrated without expanding the device space in the axial direction.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a rotating shaft arranged in a housing, and a first seal member and a second seal member are provided between the housing and the rotating shaft. In a sealing device configured to provide a pressure-resistant seal formed by combining and joining, an annular shape corresponding to the wall thickness of the reinforcing member of the second seal member is provided on the side of the first seal member facing the second seal member. A concave portion is engraved and a reinforcing member of the second seal member is embedded in the annular concave portion and joined to the first seal member.

(Operation) The operation of the present invention based on the above configuration is that the reinforcing member of the second sealing means is embedded in the annular recess of the first sealing means.

(Embodiment) Next, this invention will be described based on an embodiment shown in FIGS.

In FIG. 1, reference numeral 1 denotes a sealing device according to the present invention, which includes a first sealing member 2 for sealing a high pressure fluid side (air) A and a second sealing member 2 for sealing a low pressure fluid side (oil) B. It is composed of a seal member 3. First seal member 2
Comprises a rubber-like elastic body 4, a reinforcing member 5, and a resin ring 6. The fitting portion 7 of the rubber-like elastic body 4 is fitted to the inner peripheral surface of the housing 8, and the base portion 9 extending from one end of the fitting portion 7 to the inner diameter side extends to the high pressure fluid side A side. A wedge-shaped lip portion 10 is formed. The lip portion 10 is in sealing contact with the outer peripheral surface of the rotating shaft 11 and is a spring.
It is always urged toward the rotating shaft 11 by a constant pressure or more by 12.

The resin ring 6 is molded of ethylene tetrafluoride resin, and is located in the vicinity of the contact portion between the lip portion 10 and the rotary shaft 11 from the side surface of the rubber-like elastic body 4 opposite to the high-pressure fluid side A (the base end of the lip portion 10). Part). And the resin ring 6 is
It is fixed by a reinforcing member 5 having an L-shaped cross section embedded in the fitting portion 7 so as not to fall off from the rubber-like elastic body 4.

An annular concave portion 14 is formed on the other side surface of the rubber-like elastic body 4 by providing a circumferential projection 13 as shown in FIG. Further, a plurality of locking claws 15 are formed in the annular recess 14 toward the inner diameter side.

The second seal member 3 is embedded in the annular recess 14 and includes a reinforcing member 16 and a rubber-like elastic body 18 having a lip portion 17 that contacts the surface of the rotating shaft 11. As shown in FIG. 3, the outer peripheral surface of the reinforcing member 16 is provided with a locking groove 19 corresponding to the locking claw 15.

Further, on the surface of the rubber-like elastic body 18 on the first seal member 2 side,
A small lip 20 is provided. Reference numeral 21 is a spring attached to the lip portion 17.

In the second seal member 3 thus configured, the reinforcing member 16 is provided in the annular recess of the first seal member 2 as indicated by an arrow D in FIG.
It is joined by being embedded in 14 with a certain tightening margin. Of course, at the time of this joining, the locking claw 15 of the rubber-like elastic body 4 and the locking groove 19 of the reinforcing member 16 are locked to each other.

Further, in the joined state as shown in FIG. 1, the small lip 20 is in sealing contact with the side surface of the reinforcing member 16. A housing 22 is in projecting contact with the rubber-like elastic body 4 and the reinforcing member 16 toward the high-pressure fluid side A.

The housing 8 and the rotary shaft 11 are provided with passages 23 and 24, respectively, and the other sealing devices 2 are separated by the passages 23 and 24.
Five are provided. This sealing device 25 prevents high-pressure fluid from leaking to the atmosphere side E, and is composed of a rubber-like elastic body 26 fitted to the inner peripheral surface of the housing 8, a reinforcing member 27, and a resin ring 28. ing. The shape and material of each part of the sealing device 25 are substantially the same as those of the first seal member 2. A stop ring 29 is mounted on the atmosphere side E of the sealing device 25.

Next, the operation of the above embodiment will be described.

A high pressure fluid side A (for example, 2
When the pressure is (kgf / cm ² ), the high pressure fluid is sealed by the lip portion 10 and the lip portion 26a, and does not leak to the atmosphere side E or the low pressure fluid side B such as oil.

Further, on the low-pressure fluid side B, the lip portion 17 is in contact with the outer peripheral surface of the rotary shaft 11, so that the fluid does not leak to the high-pressure fluid side A from here. Even when the fluid on the low-pressure fluid side B enters the contact surface between the reinforcing member 16 and the resin ring via the joint surface between the annular recess 14 and the reinforcing member 16, the small lip 20 contacts the reinforcing member 5. Therefore, it does not enter the air between the lip portion 10 and the lip portion 17. Also, the locking claw of the first seal member 2
Since 15 is locked in the locking groove 19 of the reinforcing member 16 of the second seal member 3, it is possible to prevent the second seal member 3 from rotating together with the rotation of the rotary shaft 11.

As a concrete application device of the above invention, it is applied to an air pressure adjusting system used when supplying air to the wheels of a truck.

Further, in the above embodiment, the case where only the rotating shaft 11 rotates has been described, but it can be used when the housing 8 rotates at a low speed.

(Effect of the Invention) Since the present invention is configured as described above, there is an effect that the first seal member and the second seal member can be integrally joined without expanding the mounting space in the axial direction.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a vertical sectional view showing the entire structure, and FIG. 2 is a vertical sectional view before joining the first seal member and the second seal member. , FIG. 3 is a front view of the second seal member, FIG. 4 is a front view of the first seal member,
FIG. 5 is a vertical sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1 ... Sealing device, 2 ... First sealing member 3 ... Second sealing member 8 ... Housing, 11 ... Rotating shaft 14 ... Annular recess

Claims (1)

[Scope of utility model registration request] 1. A hermetic seal comprising a rotary shaft arranged in a housing, and a pressure-resistant seal formed by combining and joining a first seal member and a second seal member between the housing and the rotary shaft. In the device, an annular recess corresponding to the wall thickness of the reinforcing member of the second seal member is formed on the side of the side surface of the first seal member facing the second seal member, and the second seal is provided in the annular recess. A sealing device in which a reinforcing member of a member is embedded and joined to a first seal member.