JP2529047Y2 - Sealing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device such as an oil seal used for a shaft sealing portion of various devices, and more particularly to a sealing device suitable for pressure resistance.

[0002]

2. Description of the Related Art As a conventional sealing device of this type, there is, for example, a pressure-resistant seal 100 used for an open stay as shown in FIGS. That is, the pressure-resistant seal 100 includes an oil seal 101 as a seal member and a guide member 102, and seals between a cylinder 103 as a housing and a rod 104 as a movable shaft. Further, at one end of the cylinder 103, an inward flange portion 103a for preventing the guide member 102 from coming off is provided.

The oil seal 101 includes an annular seal body 105 fitted on the inner periphery of the cylinder 103 and a seal lip 106 slidably and sealingly contacting the outer periphery of the rod 104. Seal 10
Reference numeral 1 is arranged in contact with the inner end surface of the guide member 102.

[0004]

However, in the case of the above-mentioned prior art, the oil seal 101 and the guide member 102 are separate bodies, and the guide member 102 is connected to the atmosphere side A.
In addition, since the oil seal 101 is assembled on the fluid side O to be sealed, troubles due to intrusion of foreign matter from the atmosphere side A are scattered.

The oil seal 101 and the guide member 1
Since 02 is a separate body, there was a problem that assembly efficiency was poor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object the purpose of improving the sealing performance and improving the efficiency of assembling the seal member and the guide member. It is to provide a device.

[0007]

In order to achieve the above object, according to the present invention, a movable shaft is arranged in a housing, and a guide member for guiding the movable shaft is provided between the housing and the movable shaft. And a seal member for sealing between the housing and the movable shaft, wherein the seal members are provided on both end surfaces in the axial direction of the guide member, and the seal members are attached to the guide member. The guide member and the seal member are integrally formed by being connected via a connecting member inserted into the formed axial through hole.

Preferably, the seal member is a lip packing, and the seal members at both ends of the guide member are preferably provided symmetrically.

Further, it is effective to use the guide member for backup while receiving the axial pressure applied to the seal member by the guide member end face.

[0010]

In the sealing device having the above-described structure, the seal members are provided on both end surfaces of the guide member, so that the seal can be achieved in both axial directions.

Further, since the guide member and the seal member are integrally formed, the assembly to the portion to be sealed can be performed only once, which facilitates the assembly.

[0012] Furthermore, by providing symmetrically,
It is possible to assemble without distinguishing front and back, and the assemblability is further improved.

Further, the use of the guide member as a backup improves the pressure resistance.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. 1 to 3 showing a sealing device according to an embodiment of the present invention, reference numeral 1 denotes a pressure-resistant seal as a sealing device, which is also used in this embodiment for sealing a shaft of an open stay similar to the conventional example. The case will be described as an example. That is, the pressure-resistant seal 1 seals a gap in an opening between the rod 5 and the cylinder 4, and includes a guide member 3 for guiding the rod 5 and seal members integrally provided on both end surfaces of the guide member 3. And the first and second lip packings 21 and 22.

The guide member 3 is a sliding member such as metal or resin, and is an annular member having a U-shaped cross section. The outer periphery of the guide member 3 is fitted to the inner periphery of the cylinder 4 and the inner periphery is slidable on the rod 5. Has become. At the center position of the fitting surface 6 between the outer circumference of the guide member 3 and the inner circumference of the cylinder 4, a projection 7 is provided on the circumference of the cylinder 4 to be fitted into the outer circumference of the guide member 3. It aims at positioning in the direction. The inner circumference of the cylinder 4 and the outer circumference of the guide member 3 are in close contact with each other, and a sliding surface 8 between the inner circumference of the guide member 3 and the outer circumference of the rod 5 is slidable with a small gap.

The guide member 3 is provided with a plurality of flow holes 10 as through holes penetrating in the axial direction. The connection members 11 are inserted into the flow holes 10.
, The first and second lip packings 21 and 22 and the guide member 3 are integrally formed. That is, at the time of molding, the guide member 3 is inserted into the mold to perform insert molding. At the time of molding, a molding material such as a rubber material in a flowing state flows in through the flow hole 10 of the guide member 3 and is simultaneously integrated. It is designed to be molded.

Further, annular grooves 9, 9 'extending all around the guide member 3 are formed in the end faces of the atmosphere side A and the fluid side O to be sealed. The annular grooves 9, 9 'and the flow holes 10
Are provided at the same position in the radial direction, and the flow hole 10 is open at the groove bottom of the annular grooves 9, 9 '. Annular groove 9, 9
The groove wall surfaces on the inner diameter side and the outer diameter side of ′ are curved conical curved inclined surfaces 9a, 9a ′ having a round shape corresponding to the shape of each lip of the first and second lip packings 21, 22. .

The first and second lip packings 21 and 22 have the same shape, and the first lip packing 21 is disposed on the atmosphere side A and the second lip packing 22 is disposed on the fluid side O to be sealed. On the outer periphery of the first and second lip packings 21 and 22, there are first and second outer lips 18 and 18 'which are tightly sealed to the inner periphery of the cylinder, and on the inner periphery the first and second inner lips. 1
4, 14 'are provided respectively. The first and second inclined back surfaces 13 and 13 'of the first and second inner peripheral lips 14 and 14' are formed on the curved inclined surfaces 9a and 9a 'of the annular grooves 9 and 9' of the guide member 3 all around. Contact.

The first and second inner peripheral lips 14, 14 '
The first and second inner peripheral surfaces 15 and 15 ′ start from the sliding surface 8 of the guide member 3, the first lip packing 21 is on the axial atmospheric side A and the second lip packing 22 is on the fluid to be sealed in the axial direction. It extends inwardly in the radial direction toward the side O, and its lip tips 16, 16 'are in slidable sealing contact with the outer periphery of the rod 5.

The first and second lip packings 2
Between the first and second outer circumferential lips 18 and 18 'and the first and second inner circumferential lips 14 and 14' of the first and second outer lips 1 and 22, the first and second lips have a V-shaped cross section and have a rounded bottom. 2V grooves 12, 12 'are formed.

In the sealing device having the above structure, the first and second lip packings 21 and 22 are integrally provided on both sides of the guide member 3.
At the same time, the space between the cylinder 4 and the rod 5 is sealed by the first and second packings 21 and 22. In the prior art, the first and second lip packings 21 and 22 are provided on both sides of the guide member 3 in the axial direction. Each of O is sealed, and the sealing property is improved. Accordingly, foreign matter intrusion from the outside of the atmosphere side A can be prevented, and foreign matter resistance is improved.

Further, since the first lip packing 21 and the second lip packing 22 are provided integrally via the guide member 3 and provided symmetrically in cross section, the pressure-resistant seal 1 has a symmetrical shape. The need to distinguish between front and back is eliminated, and the assembling efficiency is significantly improved.

When a high pressure acts on the pressure-resistant seal 1, the second inclined back surface 13 ′ of the second inner peripheral lip 14 ′ and the inclined surface 9 a ′ of the groove wall of the annular groove 9 ′ provided on the end face of the guide member 3.
And the pressure-receiving inclined surface 1 of the second V-groove 12 ′
Even if a high pressure acts on 7, the curved inclined surface 9a 'of the groove 9' of the guide member 3 becomes a pressure receiving surface for fluid pressure, and a pressure backup effect is obtained.

Further, the outer peripheral side of the second packing 22 also performs the same operation, and also performs the same operation on the first packing 21 on the atmosphere side A, and the guide member 3 serves as the first and second packings 21 and 22. It becomes a backup ring and improves pressure resistance.

As described above, in consideration of high pressure, the guide member 3 and the lip packing 2 may not be bonded to each other so that the lip packing 2 has a degree of freedom with respect to pressure deformation to further improve the pressure resistance.

In the above embodiment, the packing flow holes 10 as through holes are provided in the guide member 3 at equal intervals. However, if the first and second packings 21 and 22 are connected, they are formed at the same time. You don't have to.

[0027]

The present invention has the above-described structure and operation. Since the seal members are integrally formed on both sides in the axial direction of the guide member, both sides are sealed with respect to one seal of the prior art. The performance is improved.

Further, since the seal members provided at both ends of the guide member are connected to each other through the through holes to be integrated, the assembling work can be performed extremely easily when assembling to a portion to be sealed. Performance can be improved.

Further, if the seal members provided on both sides of the guide member are provided symmetrically, it is not necessary to distinguish between the front and back sides, and the assembling efficiency is further improved.

Since the seal member is backed up by the guide member, the pressure resistance is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a pressure-resistant seal as a sealing device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the pressure-resistant seal of FIG.

FIG. 3 is a vertical cross-sectional view of an O-pulse stay using the pressure-resistant seal of FIG. 1;

FIG. 4 is a longitudinal sectional view of an open stay using a conventional sealing device.

FIG. 5 is a longitudinal sectional view of a main part of the sealing device of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressure-resistant seal 21 1st lip packing 22 2nd lip packing 3 Guide member 4 Cylinder 5 Rod 6 Fitting surface 7 Projection 8 Sliding surface 9, 9 'Annular groove 9a, 9a' Inclined curved surface 10 Flow hole (through hole) DESCRIPTION OF SYMBOLS 11 Packing connection part 12 1st V-groove 12 '2nd V-groove 13 1st inclined back surface 13' 2nd inclined back surface 14 1st inner peripheral lip 14 '2nd inner peripheral lip 15 1st inner peripheral surface 15' 2nd inner peripheral surface 16 First lip tip 16 'Second lip tip 17 Pressure receiving inclined surface 18 First outer lip 18' Second outer lip A Atmosphere side O Sealed fluid side

Claims (4)

(57) [Scope of request for utility model registration] 1. A movable shaft is disposed in a housing, a guide member for guiding the movable shaft is provided between the housing and the movable shaft, and a seal member for sealing between the housing and the movable shaft. In the sealing device, the seal member is provided on both end surfaces in the axial direction of the guide member,
A sealing device, wherein the guide member and the seal member are integrally formed by connecting the two seal members via a connecting member inserted into an axial through hole formed in the guide member. 2. The sealing device according to claim 1, wherein the sealing member is a lip packing. 3. The sealing device according to claim 1, wherein the seal members at both ends of the guide member are provided symmetrically. 4. The sealing device according to claim 1, wherein the guide member is used for backup by receiving axial pressure applied to the seal member by the guide member end face.