WO1991005188A1

WO1991005188A1 - Construction for pressing seal member of seal device

Info

Publication number: WO1991005188A1
Application number: PCT/JP1990/001152
Authority: WO
Inventors: Minoru Abe
Original assignee: Kabushiki Kaisha Daikin Seisakusho
Priority date: 1989-09-27
Filing date: 1990-09-10
Publication date: 1991-04-18
Also published as: DE4091723T1; JPH0352469U; JPH0723653Y2

Abstract

A construction for pressing a seal member of a seal device mainly used in a rod seal such as an actuator. As a member for pressing a seal member (21), an annular washer (25) is formed to provide wave shapes, radially outwardly or inwardly directed pawls (25a) are each integrally formed on each peak portion (A), and the pawls (25a) are engaged with a case member (2) or a shaft member (7), thus giving seal pressure in the axial direction to the seal member (21) by trough portions (B) of the wave-shaped washer (25). With this arrangement, the number of parts can be reduced.

Description

Specification

Seal member holding structure of sealing device

Technical field

According to the present invention, a seal member is disposed between a shaft member and a case member, which slide relatively in the axial direction, and the seal member is attached to a case member or a seal surface of the seal member. The present invention relates to a seal holding structure of a seal device for pressing in a direction.

Background art

This type of sealing device is often used for rod seals 0 of various types of actuators. As shown in Fig. 8, a sealing member is provided between rod 7 that slides in the axial direction and seal case 2 as a sealing member. 2 and the support ring 22 are arranged, the lip 21 a of the seal 21 is in contact with the outer peripheral surface of the rod, and the end projection 21 b is in contact with the seal surface 20 of the seal case 2. In contact.

5 Conventionally, in order to press the seal member in the axial direction, the corrugated washer 30 and the locking ring 31 are arranged, and the corrugated portion B of the corrugated washer 30 is brought into contact with the support ring 22. At the same time, the seal 21 is pressed against the seal surface 20 by engaging the claw 31 a of the locking ring 31 with the inner peripheral surface of the seal case 2.

0 That is, two members 30 and 31 must be manufactured and incorporated as seal member retainers.

(Object of the invention)

An object of the present invention is to reduce the number of parts for holding down a seal member, to facilitate assembly work, and to reduce costs.

Disclosure of the invention (Technical means)

In order to achieve the above object, the present invention provides, as a member for holding a sealing member, an annular washer having a wavy shape and a radially outward or inward claw integrally formed at each crest portion. Each claw of the corrugated washer with a claw is engaged with a case member or a shaft member, and an axial sealing pressure is applied to the seal member by a wave-low portion of the corrugated washer.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a longitudinal sectional view of a sealing device to which the present invention is applied, FIG. 2 is a front view of a single waved washer with a claw, FIG. 3 is a sectional view taken along a line m-m of FIG. 2, and FIG. Vacuum Yue equipped with a sealing device-longitudinal sectional view of the entire evening, Fig. 5 is a longitudinal sectional view of another embodiment, Fig. 6 is a front view of a single washer with a claw used in Fig. 5 , FIG. 7 is a sectional view taken along the line VI-VII of FIG. 6, FIG. 8 is a longitudinal sectional view of the conventional example, and FIGS. 9 and 10 are used as seal member retainers of the conventional example. It is a longitudinal section of a corrugated washer and a stop ring.

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 4 shows an overall longitudinal sectional view of a diaphragm type vacuum actuator provided with a sealing device according to the present invention. In FIG. 4, the actuator case 1 is connected via a bracket 3, for example. It is fixed to the vehicle transmission case at the rear, and the inside of the actuator 1 is divided into first and second chambers 12 and 13 by piston plate 8 and rubber diaphragm 11. I have. The piston plate 8 is fixed to the front end of the automatic rod 7, and the slide port 7 extends rearward through the rod hole 6 in the rear wall of the actuator case 1. , Auxiliary gear It is connected to the key shaft. Each of the chambers 12 and 13 in the actuator case 1 is independently connected to a negative pressure supply section and the atmosphere side (e.g., an air cleaner) via pipes 16 and 17 and a switching valve, respectively. ing. That is, when the first chamber 12 is set to a negative pressure and the second chamber 13 is set to the atmospheric pressure by operating the switching valve, the piston plate 8 and the port 7 move forward to form an example of the auxiliary transmission. If it is switched to the low-speed side, conversely, if the first chamber 12 is set to the atmospheric pressure and the second chamber 13 is set to the negative pressure at the same time, the piston plate 8 and the rod 7 are retracted and the auxiliary transmission It switches to the high-speed side.

A cylindrical seal case 2 is disposed in the rod hole of the actuator case 1, and a seal device 18 according to the present application is disposed between the seal case 2 and the rod 7.

In FIG. 1 showing an enlarged longitudinal sectional view of the sealing device, a seal case 2 is arranged coaxially with a rod 7 and integrally has an inward flange 2a at a front end thereof.

The orientation flange 2a is fixed to the rear wall of the case 5 by, for example, brazing. The inward flange 2a is at right angles to the axis of the port, and the rear surface is a seal surface 20.The seal 21 and the support ring for the bearing are located behind the seal surface 20. 22 are arranged in order.

Two annular projections 21 b are formed on the front end face of the seal 21 to abut the seal face 20, and a lip section 21 abuts on the inner end of the seal 21 at a constant pressure to the opening 7. a is formed, and an annular concave portion 21 c is formed on the rear surface, and the annular concave portion 21 c babies with the annular convex portion of the sabot ring 22. The inner cylindrical surface of the support ring 2 2 It fits on the outer peripheral surface of rod 7 without rattling, thereby positioning the seal 21 radially with respect to the mouth 7 o

A corrugated washer 25 with a claw is disposed on the rear side of the support ring 22 as a member that integrally presses the seal 21 and the sabot ring 22 forward in the axial direction.

The corrugated washer 25 with a claw is formed in an annular shape as shown in FIG. 2 and also in a waveform having a height in the axial direction as shown in FIG. 3, and each wave height located at the most rear end side. Outward claws 25a protruding outward in the radial direction are formed integrally with the part A (for example, three places). These outward claws 25a are inclined rearward, thereby exhibiting a ratchet function.

The corrugated washer 25 with the claw is pushed into the seal case 2 from the rear as shown in Fig. 1, and the lower front end portion B comes into contact with the rear surface of the sub ring 22 and the claw 25a is engaged with the claw. -The seal 21 and the support ring 22 are pushed forward in the axial direction by elastic action, and the annular projection 21b of the seal 21 is pressed with the specified seal pressure. Pressing to 0. Since the ratchet corrugated washer 25 is provided with a ratchet function by inclining the claws 25a as described above, it does not return backward after being pushed forward by a predetermined amount.

Since the sealing device 18 is positioned with respect to the rod axis by the servo ring 22 as described above, the radius of the rod 7 with respect to the case 1 may vary due to mounting errors and the like. Even when eccentric in the direction, the lip portion 21a of the seal 21 is always pressed against the rod 7 with a constant pressure, and no air leakage or the like occurs. Another embodiment for carrying out the invention

The embodiment shown in FIG. 5 to FIG. 7 is an example in which the seal device 18 is provided in an actuator where the seal case 2 moves in the axial direction with respect to the fixed rod 7. As shown in FIGS. 6 and 7, a claw-corrugated washer 25 having an inward claw 25 b protruding inward in the radial direction is used as a seal member presser. Each claw 2b is formed at each crest portion A, and is inclined rearward. In FIG. 5, the basic structure of the seal 21 and support ring 22 is the same as that of the outer peripheral seal shown in FIG. 1 except that the inside and outside in the radial direction are reversed. And the same parts are given the same numbers. The protrusion 21b of the seal 21 contacts the seal surface 20 of the flange 7a of the rod 7, and the lip portion 21a contacts the inner peripheral surface of the case 2. The wavy portion B of the corrugated washer 25 with the claw is in contact with the rear surface of the support ring 22, and the claw 25 b is engaged with the outer peripheral surface of the rod so as to be pushed forward.

The invention's effect

As described above, according to the present invention, a seal member is disposed between a shaft member and a case member that slide relatively in one direction, and the seal member is a case member or a seal member of the seal member. In the seal member holding structure of the seal device, which presses the seal member in the axial direction, an annular washer 25 is formed in a waveform as a member for holding the seal member, and radially outward at each crest portion A. Alternatively, the inward claws 25 a (25 b) are integrally formed, and the claws 25 a (25 b) of the corrugated washer 25 are engaged with the case member or the shaft member, and the corrugated washer 25 As the seal part is designed to apply an axial sealing pressure to the sealing member by the wave bottom B of: Only one member, ie, the corrugated washer 25 with the claw, needs to be provided as the seal member pusher, so that the number of parts can be reduced, the cost can be reduced, and the assembling operation can be facilitated.

In other words, one corrugated washer with claw can perform both functions of conventional corrugated washer and retaining ring.

Industrial applicability

It is most suitable for rod seals of various types of vacuum cleaners such as diaphragm vacuum cleaners.

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Claims

The scope of the claims

1. A seal member is disposed between a shaft member that slides relatively in the axial direction and a case member, and the seal member is mounted on a case member or a seal surface of the seal member. Of the seal device to press in the direction

5 In the holding member holding structure, an annular washer is formed in a wave shape as a member for holding the seal member, and radially outward or inward claws are integrally formed at each crest portion. Each claw is engaged with the case member or the shaft member so that the corrugated washer of the corrugated washer applies an axial initial pressure to the seal member.

The seal member holding structure of the sealing device that was used.

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