JPH0726604Y2 - Reconstruction seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a reciprocating seal that seals between two objects that relatively reciprocate.

[Conventional technology]

Generally, as two relatively reciprocating objects that require a seal, for example, a combination of a cylinder and a piston that moves axially inside the cylinder, or a bearing and a piston that moves axially through the inside thereof are used. There are various combinations such as combinations with shafts.

FIG. 3 shows a seal portion of a piston 2 that reciprocates in the cylindrical cylinder 1 in the axial direction. The seal between the cylinder 1 and the piston 2 is an annular recess provided on the outer peripheral portion of the piston 2. This is performed by an annular reciprocating seal 4 mounted in the groove 3. The reciprocating seal 4 has a cross section of approximately L.
A seal body 6 made of an elastic material such as rubber and reinforced by a U-shaped metal reinforcing ring 5 is mounted in the recessed groove 3, and the seal body 6 is attached from the outer end portion of the flange portion 5a of the reinforcing ring 5. The main lip 7 integrally extended to the oil side is brought into contact with the inner peripheral surface of the cylinder 1 to perform an oil seal, and similarly, the dust lip 8 extended to the dust side is connected to the inner peripheral surface of the cylinder 1. A dust seal is made by contacting the surface.

Further, an external force acts on the piston 2 in a direction orthogonal to the axial direction to cause eccentricity, and the outer peripheral surface of the piston 2 may come into contact with the inner peripheral surface of the cylinder 1 to cause galling therebetween. Therefore, a spacer 10 made of resin or metal is mounted in a groove 9 provided at a position axially separated from the reciprocating seal 4 such that the outer peripheral surface of the spacer 10 protrudes from the outer peripheral surface of the piston 2 to form a cylinder. A galling between the piston 1 and the piston 2 is prevented.

[Problems to be solved by the device]

A spacer for preventing galling in a piston 2 which is expected to have an eccentric reciprocating motion like the piston 2 in FIG.
It is necessary to install 10, but this spacer 10
In order to mount the piston 2 on the outer peripheral surface of the piston 2, a recess 10 must be provided on the outer peripheral surface of the piston 2, and a spacer 10 separate from the reciprocating seal 4 must be prepared and mounted in the groove 9. The manufacturing cost was high.

Furthermore, when the axial length of the portion where the reciprocating seal 4 and the spacer 10 are provided is limited and only one reciprocating seal 4 can be mounted, the spacer
Since there is no 10, the piston 2 is eccentrically moved reciprocally, and galling occurs between the cylinder 1 and the piston 2, and the main lip 7 and the dust lip 8 of the reciprocating seal 4 are attached to the inner peripheral surface of the cylinder 1. There is an inconvenience that the pressure is applied with an excessive pressing force, the deterioration becomes severe, and the life is shortened.

The present invention has been made in view of these points, and can exhibit a galling prevention function in addition to the sealing function.
With a single reciprocating seal, it is possible to perform a seal between two reciprocating objects and prevent galling, improve durability, reduce cost, and reduce the mounting area. An object of the present invention is to provide a reciprocating seal capable of performing sealing while effectively preventing galling.

[Means for Solving the Problems]

The reciprocating seal of the present invention is mounted on either one of two relatively reciprocating objects with a seal main body made of an elastic material, and a lip made of an elastic material for slidingly contacting the other object for sealing. In the reciprocating seal formed by extending from the seal body, an anti-galling member for preventing galling between the objects is integrally arranged on the seal body so as to face the other member. A metallic reinforcing ring is embedded in the seal body, and a backup portion for supporting the anti-galling member from the seal body side with an elastic material interposed is provided in the reinforcing ring.

[Action]

According to the reciprocating seal of the present invention, the lip seals the two objects when the two objects are relatively reciprocating, and the galling prevention member prevents the galling between the two objects.

Since this galling prevention member is provided on the reciprocating seal itself, there is no need to provide a unique groove or the like for mounting the galling prevention member, and the overall configuration is compact,
The cost is low, the durability of the lip is improved, and the life is extended.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows an embodiment of the present invention.

This embodiment is a cylindrical cylinder used for a hydraulic cylinder.
The case where the seal between 11 and the piston 12 is performed is shown.

The reciprocating seal 14 of the present embodiment is formed so as to be mounted in the annular groove 13 provided on the outer peripheral surface of the piston 12. The reciprocating seal 14 reinforces a seal main body 16 made of an elastic material such as rubber by a metallic reinforcing ring 15, and is mounted in the concave groove 13 with the seal main body 16 portion. Cylinder 11 is placed on the outside of this seal body 16
Main lip that makes oil seal by sliding contact with the inner surface of
17 and a dust lip 18 for dust sealing are integrally formed. Both lips 17 and 18 extend from the seal body 16 with their tips facing each other. The reinforcing ring 15 is a cylindrical portion for maintaining the shape of the seal body 16.
15a and a backup portion 15b which is bent outward from one end of the cylindrical portion 15a and whose front end portion is bent in a direction between the main lip 17 and the dust lip 18. In this embodiment, the cylinder 11 and the piston are provided outside the base of the main lip 17 and the dust lip 18.
An anti-galling member 19 made of resin, metal, or the like is formed on the entire outer circumference so as to prevent the galling of the both by properly maintaining the distance from the galvanic material 12. As the anti-galling member 19, a tetrafluoroethylene resin, a tetrafluoroethylene resin mixed with a filler,
It is preferable to use one having low friction resistance such as phosphor bronze and excellent in wear resistance, and after molding the seal main body 16, the main lip 17, and the dust lip 18 with an elastic material such as rubber for the reinforcing ring 15. The anti-galling member 19 formed separately may be attached, or the anti-galling member 19 may be integrally formed simultaneously with the molding of the seal body 16, the main lip 17, and the dust lip 18.

Next, the operation of this embodiment will be described.

When the piston 12 is reciprocating without eccentricity with respect to the cylinder 11, the gap between the two is properly maintained, so that one main lip 17 of the reciprocating seal 14 reliably provides an oil seal. The other dust lip 18 reliably performs dust sealing, and the piston 12 has a good sealing function.

When an external force acts to move the piston 12 in the direction orthogonal to the axial direction and the piston 12 reciprocates eccentrically, in the present embodiment, the galling prevention member 19 of the reciprocating seal 14 is inside the cylinder 11. Cylinder 11
And the piston 12 are prevented from directly contacting each other. As a result, it is possible to reliably prevent galling between the cylinder 11 and the piston 12. Further, it is possible to prevent the main lip 17 and the dust lip 18 from being excessively deformed, so that each sealing function can be well maintained. Moreover, since the galling prevention member 19 has low frictional resistance and wear resistance, it does not give a large resistance to the reciprocating movement of the piston 12, and as described above, the main lip 17 and the dust lip 18 are also included in the cylinder 11. Since the sliding contact area with the peripheral surface is regulated to an appropriate amount, the reciprocating movement of the piston 12 is maintained extremely well. This prevents the both lips 17, 18 from being pressed against the inner peripheral surface of the cylinder 11 with an excessive pressing force, improving the durability of both lips 17, 18 and prolonging their service life. Also, the outer peripheral end surface 1 of the backup portion 15b of the reinforcing ring 15
The smaller the distance between 5c and the inner peripheral end surface 19a of the galling prevention member 19, the more efficiently the eccentricity of the reciprocating seal 14 can be restricted.

Further, since the anti-galling member 19 is provided integrally with the reciprocating seal 14, there is no need for a dedicated space for mounting the anti-galling member 19 on the piston 2, and no special processing is required. . Therefore, according to the present embodiment, both the sealing function and the galling prevention function can be properly performed even in the piston 12 having a short axial length, and the cost is very low.

FIG. 2 shows another embodiment of the present invention, which is used in a place where it is not necessary to perform dust sealing. Only the main lip 17 is provided without providing the dust lip 18, and the vicinity of the base of the main lip 17 is provided. In the groove 20 formed on the outer peripheral portion of the seal body 16, the galling prevention member 21 having a substantially square cross section is formed.
The outer peripheral surface of the cylinder 12 from the outer peripheral surface of the seal body 16.
It is arranged so as to project to the side.

This embodiment also operates in exactly the same way as the embodiment of FIG. 1 except that the dust sealing function is not applied.

In each of the above-described embodiments, the reciprocating seal 14 is mounted on the reciprocating piston 12 side.
14 may be provided on the fixed side.

The present invention is not limited to the above embodiment,
It can be changed if necessary.

[Effect of device]

Since the reciprocating seal of the present invention is constructed and operates as described above, it is possible to exert a galling prevention function in addition to the sealing function, and one reciprocating seal is used to relatively reciprocate two objects. It is possible to seal the gap between them and prevent galling, improve durability, reduce cost, and perform sealing while effectively preventing galling even for a narrow mounting area. And so on.

[Brief description of drawings]

1 and 2 are sectional views showing an embodiment of the reciprocating seal of the present invention, and FIG. 3 is a sectional view showing a conventional example. 11 …… Cylinder, 12 …… Piston, 13 …… Concave groove, 14 ……
Reciprocating seal, 15 ... Reinforcing ring, 15a ... Cylindrical part, 15b ...
… Backup unit, 16 …… Seal body, 17 …… Main lip, 18 …… Dust lip, 19 …… Galling prevention member.

Claims (2)

[Scope of utility model registration request] 1. A seal body made of an elastic material is attached to either one of two relatively reciprocating objects, and a lip made of an elastic material is slidably in contact with the other object for sealing. In the reciprocating seal extending from the main body part, the anti-galling member for preventing galling between the objects is integrally arranged on the seal main body so as to face the other member, and the seal is provided. A reciprocating seal, wherein a metallic reinforcing ring is embedded in the main body, and a backup portion for supporting the anti-galling member from the seal body side with an elastic material interposed is provided in the reinforcing ring. 2. The reciprocating motion according to claim 1, wherein the galling prevention member is disposed between the main lip and the dust lip extending from the seal main body portion in opposite directions. sticker.