JP5383713B2 - seal - Google Patents

Description

  According to the prior art, it is known to prevent the seal from being pushed out of the housing, for example by using a snap ring which can be inserted into the housing groove.

  It is an object of the present invention to provide a seal that is secured from being pushed out of the housing by improved means.

  This problem has been solved by the means described in claim 1. Advantageous embodiments are described in the dependent claims.

  According to claim 1, the seal according to the present invention has the following characteristics.

A reinforcing element having at least an axial section configured in an annular shape is provided;
The reinforcing element has at least one protruding portion protruding in the axial direction at an axial end portion, the protruding portion has a bulging portion on the outer peripheral surface side, and the protruding portion is formed by the bulging portion. It engages in a snap-hook manner in a cavity with a correspondingly configured recess,
A sealing element connected to the reinforcing element is provided for abutting and sealing the part which is rotatable and / or longitudinally movable relative to the cavity.

The fixed function of counteracting the extrusion force, by incorporating the reinforcing elements of the seal, it is possible to omit the prior art mentioned at the outset, the separate elements for securing against the extrusion force, and have The advantage was obtained. In addition, the assembly of the seal is simplified. The seal according to the invention is adapted to self-lock in an advantageous manner if it is correctly assembled.

  Additional advantages and features of the present invention are described below using the illustrated embodiments.

It is a longitudinal cross-sectional view of the upper area | region of a sealing device. It is a perspective view of the main seal of the sealing device shown in FIG.

  FIG. 1 shows a longitudinal sectional view of the upper half of a sealing device according to one embodiment of the present invention. The sealing device has a ring-shaped main seal 5 which is shown in a perspective view in FIG. The sealing device is a part of the housing 1. The housing 1 is, for example, a part of a pump housing or a motorcycle fork. In the pump housing, a main seal 5 seals between the housing 1 and a shaft 4 provided for rotation. On the other hand, in a motorcycle fork, the main seal 5 seals between the housing 4 and the rod 4 that performs translational movement. In this case, the shaft 4 or the rod 4 is indicated by a broken line. Has been. In any case, the main seal 5 of the sealing device needs to be protected against the extrusion pressure in the right direction based on the high pressure on the left side of the main seal 5. In motorcycle forks, overpressures of 2 to 4 bar, in extreme cases up to 20 bar, occur.

  In order to prevent the extrusion pressure as described above, a radially extending groove 2 is formed in the cavity of the housing 1, and the main seal 5 is engaged with the groove 2 in a snap hook shape. Corresponding means are formed. The main seal 5 has a sealing element 10 made of an elastomer material with two sealing lips 11, 12 arranged obliquely to each other, and each sealing lip 11, 12 has a high pressing force on the back side. Are each provided with one annular coil spring 18 and 19.

  Further, the main seal 5 has a reinforcing element 20 made of glass fiber reinforced plastic, and the sealing element 10 is vulcanized with, for example, an adhesive aid or without an adhesive aid. Yes. In this case, the reinforcing element 20 includes sector-like or flag-like projecting portions 21 and 22 projecting in the axial direction at the right axial end portion. A plurality of protrusions 21 of the first type having snap-hook-like bulges are formed on the outer peripheral surface side, which are distributed in the circumferential direction, and these protrusions 21 are annular grooves 2 of the housing 1. The main seal 5 is protected against extrusion pressure by snapping into it.

  The protruding portion 21 configured in a snap hook type further includes a kind of stepped portion in the transition region from the end surface side to the outer peripheral surface on the free end surface side, that is, the right end surface side. Also in the joined main seal 5, a tool, such as a screwdriver, can be introduced into the step, whereby the first type of protrusion 21 is folded inward in the radial direction, or at least in the radial direction. The main seal 5 can be removed from the housing 1 again without bending or breaking the housing 1.

  Between the plurality of protrusions 21 of the first type, the second type of protrusions 22 are disposed. These second type of protrusions 22 are different from the first type of protrusions 21. In contrast, the bulging portion is not formed on the outer peripheral surface side. The plurality of protrusions 22 of the second type are configured to be thicker in the radial direction in the region on the left side in the axial direction than the protrusions 21 of the first type. Since the outer peripheral surface of the tool for inserting and / or removing 5 can be applied to the thicker region, the first type of protrusion 21 configured as a snap hook is further radially inward. Maintain mobility. Furthermore, this tool has a radius between the bases (roots) of two sealing lips 11 and 12 in the form of a perforated disc of the reinforcing element 20 whose end face is optionally coated with the material of the sealing element 10. It may be configured to be provided to abut on the end face side of the region extending inward in the direction.

  According to another embodiment, the tool also engages the free end face side 22 of the protrusion 22 for assembling the main seal 5. In this case, in order to allow the first type of protrusion 21 to bend without being obstructed in the radial direction, the second type of protrusion 22 is axially right side of the first type. Since it is configured to be slightly longer than the protruding portion 21, the tool contacts only the end surface side of the protruding portion 22, and does not contact the end surface side of the protruding portion 21.

  Also, by specially configuring one tool, when the main seal 5 is assembled, the tool can be removed after first properly locking the first type of protrusion 21. For example, when the main seal 5 is assembled, the protrusions 21 and 22 are provided with intermediate chambers that do not interfere with each other in the circumferential direction in order to cause the snap hook-like protrusion 21 to be elastically deformed in a springy manner.

  Further, the sealing device has a sub seal 30, and the sub seal 30 has a seal portion 32 that surrounds the reinforcing portion 35. The sub-seal 30 is configured as a protective lip or dust lip 33 and has a stopper for contacting the end face of the housing 1. Further, the sub seal 30 is formed extending in the axial direction, and the sub seal 30 is engaged with the region of the main seal 5 locked in the housing 1 from below in a shape coupling (constraint by shape) type. It has become. The seal device is configured such that the sub seal 30 can be assembled only after the main seal 5 is correctly assembled. In this case, by engaging from below, the snap hook type protrusion 21 is fixed in the radial direction, thereby preventing the main seal 5 from being accidentally detached, and the snap hook type protrusion 21 is in the radial direction. Inward folding is avoided.

  In another embodiment, the assembly tool is adapted to engage a perforated disk of the reinforcing element 20 that extends radially inward between the bases of the two sealing lips 11 and 12. Part 22 can be omitted.

Claims (14)

A seal,
At least the axial direction of the segment is a reinforcing element that is configured in a ring, and projecting axially in the axial direction end portion, have a plurality of first projecting portion disposed at a distance from one another in the circumferential direction , the first protrusion is provided with a bulging portion on the outer peripheral surface, the evagination portion, the first projecting portion in the snap hook type in a cavity provided with a recess which is configured correspondingly A reinforcing element adapted to engage;
A sealing element connected to the reinforcing element for abutting and sealing against a rotatable and / or longitudinally movable part relative to the cavity ;
An annular fixing element insertable into a cavity formed by the first protrusion for preventing unlocking of the first protrusion locked in a snap-hook manner;
Comprising
A seal characterized by that. A seal,
A reinforcing element having at least an axial section configured in an annular shape and having a plurality of first protrusions protruding in an axial direction at an end portion in the axial direction, and the first protrusions swell toward the outer peripheral surface side. A reinforcing element comprising a bulge, the bulge being adapted to engage the first protrusion in a snap-hook manner in a cavity with a correspondingly configured recess;
A sealing element connected to the reinforcing element for abutting and sealing against a rotatable and / or longitudinally movable part relative to the cavity;
The reinforcing element has a plurality of second protrusions protruding in the axial direction, which do not have a snap hook function, provided between the plurality of first protrusions, and
The second protrusion is formed thicker than the first protrusion in a region opposite to the free end surface, and protrudes radially inward.
A seal characterized by that. 2. The seal according to claim 1, wherein the reinforcing element has a plurality of second projecting portions that are provided between the first projecting portions and have no snap hook function and project in the axial direction. . The seal according to claim 2 or 3 , wherein the first and second protrusions are alternately arranged in the circumferential direction. The seal according to any one of claims 2 to 4, wherein the first and second protrusions are spaced apart from each other in the circumferential direction. Least first protrusion before Symbol also is provided with a recess in the transition region to migrate to the outer peripheral surface from the free end face of the projecting portion, depressions viewed portion, the seal is disposed in the cavity when the form a tool working surface for twisting or the projecting portion for pressing the projecting portion radially inwardly, the seal of any one of claims 1 to 5. The fixing element is configured as a separate seal with a ring-shaped sealing lip, sealing of any one of claims 1 to 6. The seal according to any one of claims 1 to 7 , wherein the reinforcing element is made of glass fiber reinforced plastic. The sealing element has a ring-shaped sealing lip, sealing of any one of claims 1 to 8. The seal according to claim 9 , wherein the sealing element has two sealing lips projecting obliquely in opposite directions. 11. A seal according to claim 10 , wherein the reinforcing element has a region extending between the bases of the two sealing lips of the sealing element towards the radially inward direction . The sealing element has an elastomeric material, the seal of any one of claims 1 to 11. At least one sealing lip has an annular coil spring, the seal of any one of claims 1 to 12. The sealing element and / or the reinforcing element is configured from the integrally and / or the same material, the seal of any one of claims 1 to 13.

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