CN210739237U - Sealing device - Google Patents
Sealing device Download PDFInfo
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- CN210739237U CN210739237U CN201921284377.9U CN201921284377U CN210739237U CN 210739237 U CN210739237 U CN 210739237U CN 201921284377 U CN201921284377 U CN 201921284377U CN 210739237 U CN210739237 U CN 210739237U
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- outer peripheral
- axis
- sealing device
- reinforcing ring
- peripheral side
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Abstract
The utility model relates to a sealing device, it is used for sealing at the axial region, with be the annular periphery component that forms in the periphery side of axial region with axis (x) as the center between, and includes: a reinforcing ring (10) that is provided on the inner peripheral side (d) of the outer peripheral member and that is formed in a disk shape with the axis as the center; and an elastic body part (20) which is mounted on the reinforcing ring, takes the axis as the center and is formed by an annular elastic body; and the elastic body part has: a lip portion (21) which covers the inner peripheral end portion (11) of the reinforcing ring from the inner peripheral side, is annular around the axis, and slidably contacts the shaft portion; and an outer peripheral portion (22) which covers the outer peripheral end portion (12) of the reinforcing ring from the outer peripheral side (c), is annular with the axis as the center, and can contact with the outer peripheral member; the outer peripheral portion has: a protrusion (221) that protrudes further to one side than the reinforcement ring in the axial direction; and an outer peripheral surface portion (222) which is formed annularly with the axis as the center and can contact with the outer peripheral member.
Description
Technical Field
The utility model relates to a sealing device.
Background
A damper used in a vehicle or the like uses a sealing device that seals between a shaft portion of a reciprocating piston and an outer cylinder, a guide rod portion, or the like, which is formed in a ring shape on an outer peripheral side of the shaft portion.
Fig. 3 is a partial sectional view in a section along the axis x, and shows a schematic configuration of a conventional sealing device 100. As shown in fig. 3, the sealing device 100 includes: a reinforcing ring 110 provided on the inner peripheral side of the outer peripheral member and formed in a disk shape with the axis x as the center; and an elastic body portion 120 which is attached to the reinforcing ring 110, is annular about the axis x, and is formed of an elastic body. The elastic body portion 120 includes: a seal lip 121 that covers an inner peripheral end portion of the reinforcement ring 110 from an inner peripheral side d, is annular about the axis x, and slidably contacts a shaft portion not shown; and an outer peripheral portion 122 that covers the outer peripheral end 112 of the reinforcing ring 110 from the outer peripheral side c, is annular about the axis x, and is formed so as to be contactable with the guide rod portion 131.
SUMMERY OF THE UTILITY MODEL
Problem to be solved by utility model
Fig. 4 is a partial sectional view in a section along the axis x, and shows a state of use of the conventional sealing device 100.
In the sealing device 100 for a damper, as shown in fig. 4, the outer peripheral portion 122 of the elastic body portion 120 has an outer cylinder 132, and the outer cylinder 132 has a disk portion extending from an end portion on the outer peripheral side c of the guide rod portion 131 to the inner peripheral side d. The outer peripheral portion 122 of the elastic body portion 120 is fixed in position by contacting the disk portion 133 of the outer cylinder 132, thereby securing sealability.
However, in the conventional sealing device 100, when the contact force of the disc portion 133 against the outer circumferential portion 122 becomes strong and the disc portion is in a tightened state, the reinforcing ring 110 is positioned on the inner side b of the outer circumferential portion 122, and therefore, a compression force more than necessary is applied to the outer circumferential portion 122 sandwiched between the disc portion 133 and the reinforcing ring 110, and thus, there is still room for improvement in terms of securing the sealing property.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a sealing device capable of improving the securing of sealing performance.
Means for solving the problems
In order to achieve the above object, a sealing device according to the present invention is a sealing device for sealing between a shaft portion that reciprocates and an outer peripheral member that is formed in a ring shape around an axis on an outer peripheral side of the shaft portion, the sealing device including: a reinforcing ring provided on an inner peripheral side of the outer peripheral member and formed in a disk shape around the axis; and an elastic body portion attached to the reinforcing ring, formed in a ring shape with the axis as a center, and formed of an elastic body, the elastic body portion including: a seal lip which covers an inner peripheral end portion of the reinforcement ring from an inner peripheral side, is annular about the axis, and slidably contacts the shaft portion; an outer peripheral portion that covers an outer peripheral end portion of the reinforcing ring from an outer peripheral side, is annular about the axis, and is formed so as to be contactable with the outer peripheral member, the outer peripheral portion including: a protruding portion that protrudes further to one side than the reinforcement ring in an axial direction; and an outer peripheral surface portion that is annular about the axis and is formed so as to be contactable with the outer peripheral member.
In the sealing device according to an embodiment of the present invention, the outer peripheral portion is formed in a ring shape around the axis with respect to the outer peripheral end portion of the reinforcing ring.
In the sealing device according to an embodiment of the present invention, the outer diameter of the reinforcing ring is smaller than the inner diameter of the outer peripheral portion.
In a sealing device according to an embodiment of the present invention, the outer peripheral member includes: a guide rod part which forms an annular concave part which is opened to the one side by taking the axis as a center; and an outer cylinder provided on an outer peripheral side of the guide rod part and having a disk part extending from an outer peripheral end of the guide rod part to an inner peripheral side, wherein the outer peripheral part contacts the disk part of the outer cylinder inside the recess.
In the sealing device according to an aspect of the present invention, the reinforcement ring is provided at a position not overlapping with the disk portion of the outer tube in a radial direction.
Effect of the utility model
According to the sealing device of the present invention, the sealing performance can be ensured to be improved.
Drawings
Fig. 1 is a partial cross-sectional view in a cross section along an axis line, and shows a schematic configuration of a sealing device according to an embodiment of the present invention.
Fig. 2 is a partial sectional view in section along the axis for showing a use state of the sealing device shown in fig. 1.
Fig. 3 is a partial cross-sectional view taken along an axis line, showing a schematic configuration of a conventional sealing device.
Fig. 4 is a partial cross-sectional view in a cross-section taken along an axis line, showing a state of use of the conventional sealing device shown in fig. 3.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is a partial cross-sectional view in a cross section along an axis line, and shows a schematic configuration of a sealing device 1 according to an embodiment of the present invention. Fig. 2 is a partial cross-sectional view of the sealing device 1 taken along the axis line, showing the state of use. Hereinafter, for convenience of explanation, the direction of arrow a (see fig. 1) in the axis x direction is set to the outside, and the direction of arrow b (see fig. 1) in the axis x direction is set to the inside. In a direction perpendicular to the axis x (hereinafter, also referred to as "radial direction"), a direction away from the axis x (arrow c direction in fig. 1) is an outer peripheral side, and a direction toward the axis x (arrow d direction in fig. 1) is an inner peripheral side.
As shown in fig. 1 and 2, the sealing device 1 seals between a shaft portion 40 of a reciprocating piston used in a shock absorber of a vehicle or the like, and a guide rod portion 31 and an outer cylinder 32 which are outer peripheral members formed annularly about an axis x and on an outer peripheral side of the shaft portion 40. The sealing device 1 includes: a reinforcing ring 10 provided on an inner peripheral side d of the outer peripheral member and formed in a disk shape with an axis x as a center; and an elastic body portion 20 attached to the reinforcing ring 10, and formed of an elastic body in a ring shape with the axis x as the center. The elastic body portion 20 includes: a lip portion 21 that covers the inner peripheral end portion 11 of the reinforcement ring 10 from the inner peripheral side d, is annular about the axis x, and slidably contacts the shaft portion 40; and an outer peripheral portion 22 that covers the outer peripheral end portion 12 of the reinforcement ring 10 from the outer peripheral side c, is annular about the axis x, and is formed so as to be able to contact an outer peripheral member. The outer peripheral portion 22 has: a protrusion 221 that protrudes further to one side than the reinforcement ring 10 in the axis x direction; and an outer peripheral surface portion 222 which is formed in a ring shape with the axis x as the center and is contactable with the outer peripheral member. Hereinafter, the sealing device 1 according to the embodiment of the present invention will be described specifically.
As shown in fig. 1, the reinforcement ring 10 is an annular metal member centered or substantially centered on the axis x. Examples of the metal member used for the reinforcement ring 10 include stainless steel and SPCC (cold rolled steel). The reinforcement ring 10 is manufactured by, for example, press working or forging the metal member. The reinforcement ring 10 is, for example, a disc-shaped or substantially disc-shaped member extending in a radial direction, which is a direction perpendicular to the axis x direction. The reinforcing ring 10 has an inner peripheral end 11 provided on the inner peripheral side d and an outer peripheral end 12 provided on the outer peripheral side c. That is, the reinforcing ring 10 is formed with a portion of the inner peripheral end portion 11 as a through hole and is annular or substantially annular about the axis x. The reinforcement ring 10 is formed such that, in the state of use of the sealing device 1, the axis x of the sealing device 1 coincides with the axis x of the shaft portion 40.
The elastic body portion 20 is attached to the outer side (arrow a direction), the outer peripheral side (arrow c direction), and the inner peripheral side (arrow d direction) of the reinforcement ring 10. That is, the reinforcement ring 10 reinforces the elastic body portion 20. The outer diameter D1 (the length from the axis x to the outer peripheral end 12) of the reinforcement ring 10 is smaller than the inner diameter D2 (the length from the axis x to the end of the outer peripheral portion 22 on the inner peripheral side D), i.e., closer to the inner peripheral side D, of the outer peripheral portion 22.
As shown in fig. 2, in the use state of the sealing device 1, the reinforcing ring 10 is provided at a position where the outer peripheral end portion 12 does not overlap with the disk portion 321 of the outer cylinder 32 in the radial direction.
The elastic body portion 20 is attached to the reinforcement ring 10 as described above, and is formed integrally with the reinforcement ring 10 so as to cover the reinforcement ring 10. The elastomer of the elastomer portion 20 is made of, for example, various rubber materials. Examples of the various rubber materials include synthetic rubbers such as Nitrile Butadiene Rubber (NBR), hydrogenated nitrile butadiene rubber (H-NBR), acrylic rubber (ACM), and fluorine rubber (FKM). The elastomer portion 20 is formed by cross-linking (vulcanization) molding using a molding die. In this cross-linking molding, the reinforcing ring 10 is placed in a molding die, and the elastomer part 20 is bonded to the reinforcing ring 10 by cross-linking and bonding, thereby integrally molding the elastomer part 20 and the reinforcing ring 10.
The elastic body portion 20 includes a lid portion 23 in addition to the lip portion 21 and the outer peripheral portion 22.
The lip portion 21 is formed in a ring shape around the axis x and slidably contacts the shaft portion 40. The lip 21 covers the inner peripheral end 11 of the reinforcement ring 10 from the inner peripheral side d. The lip portion 21 has: a dust lip 211 extending to the inner peripheral side (arrow d direction) and the outer side (arrow a direction) in the axis x direction and having a tip portion with a diameter decreasing toward the inner peripheral side d in the axis x direction; a seal lip 212 extending inward (in the direction of arrow b) along the axis x and having a tip portion formed to protrude inward (in the direction of arrow d); and an inner circumferential surface 213 which is an annular surface facing the outer circumferential surface of the shaft portion 40.
At least one dust lip 211 is provided so as to extend obliquely toward the outer peripheral surface of the shaft portion 40 shown in fig. 2, which is located on the inner peripheral side d of the lip portion 21. Specifically, the dust lip 211 has a tapered cross section extending from the lip 21 so as to decrease in diameter toward the outer side a and the inner peripheral side d in the direction of the axis x.
The seal lip 212 is formed so that a leading end extending from the lip portion 21 along the axis x is slidable with respect to the outer peripheral surface of the shaft portion 40. The seal lip 212 has a conical cylindrical shape whose diameter decreases toward the inner peripheral side (in the direction of arrow d) in the direction of the axis x. That is, in a cross section along the axis x (hereinafter, also simply referred to as a cross section), the seal lip 212 extends obliquely with respect to the axis x from the inner peripheral surface 213 toward the tip end portion on the inner peripheral side (in the direction of arrow d).
The seal lip 212 has a recess on the outer peripheral side (in the direction of arrow c) facing away from the tip end, and a garter spring 50 as an annular elastic member serving as a pressing force applying member is mounted in the recess.
The garter spring 50 is, for example, a metal spring member, and urges the seal lip 212 radially inward (in the direction of arrow d) to apply a pressing force of a predetermined magnitude that presses the seal lip 212 against the outer peripheral surface of the shaft portion 40. The garter spring 50 is not limited to being made of metal as long as it can apply a pressing force, and may be made of various other materials such as resin. Further, the sealing device 1 may not have the garter spring 50.
The outer peripheral portion 22 is formed to be contactable with outer peripheral members, i.e., the guide rod portion 31 and the outer cylinder 32. The outer peripheral portion 22 covers the outer peripheral end portion 12 of the reinforcement ring 10 from the outer peripheral side c. Specifically, the outer peripheral portion 22 is formed in an annular shape around the axis x on the outer peripheral side c with respect to the outer peripheral end portion 12 of the reinforcement ring 10. Since the outer diameter D1 of the reinforcement ring 10 is smaller than the inner diameter D2 of the outer circumferential portion 22, the reinforcement ring 10 is not provided inside the outer circumferential portion 22. The outer peripheral portion 22 has the protruding portion 221 and the outer peripheral surface portion 222 as described above.
The protruding portion 221 protrudes further to the outside a than the reinforcement ring 10 in the axis x direction as described above. As shown in fig. 2, the protruding portion 221 of the outer peripheral portion 22 contacts the disk portion 321 of the outer cylinder 32 inside the recess 311 formed in the guide bar portion 31 in the use state.
The outer peripheral surface portion 222 is formed annularly around the axis x as described above. The outer peripheral surface portion 222 contacts an outer peripheral member, specifically, a concave portion 311 formed in the guide bar portion 31 in a use state.
The lid 23 is formed integrally with the lip 21 and the outer peripheral portion 22, and covers, for example, the outer side a of the reinforcing ring 10. In the sealing device 1, the cover 23 may cover the inner side b of the reinforcing ring 10. The sealing device 1 may not have the lid 23.
Next, the operation of the sealing device described above will be described.
As shown in fig. 2, in the use state, the seal lip 212 and the dust lip 211 of the elastic body portion 20 contact the outer peripheral surface of the shaft portion 40 at their respective distal ends. In the use state, the seal lip 212 and the dust lip 211 form a sealed space between the inner peripheral surface 213 (see fig. 1) and the outer peripheral surface of the shaft portion 40. The seal lip 212 and the dust lip 211 are deformed by contact with the outer peripheral surface of the shaft portion 40. In the use state, neither the seal lip 212 nor the dust lip 211 may be deformed, and either one of them may be deformed. In the use state, the outer peripheral portion 22 of the elastic body portion 20 contacts the guide rod portion 31 and the outer cylinder 32 which are outer peripheral members.
In the sealing device 1, the outer diameter D1 of the reinforcement ring 10 is smaller than the inner diameter D2 of the outer peripheral portion 22 of the elastic body portion 20. The outer peripheral portion 22 is formed in an annular shape around the axis x on the outer peripheral side c of the outer peripheral end portion 12 of the reinforcement ring 10 so as to cover the outer peripheral end portion 12 of the reinforcement ring 10 from the outer peripheral side c. In the outer peripheral portion 22, the outer peripheral surface portion 222 contacts the guide rod portion 31, and the protruding portion 221 contacts the outer cylinder 32.
In the sealing device 1 having the outer peripheral portion 22 formed as described above, the reinforcement ring 10 is not positioned inside b of the outer peripheral portion 22 in the use state. Therefore, even when the contact force of the disc portion 321 of the outer cylinder 32 against the outer circumferential portion 22 becomes strong and the outer circumferential portion 22 is in a tightened state, the sealing device 1 can apply an appropriate contact force to the outer circumferential portion 22 without applying a compression force more than necessary to the outer circumferential portion 22 sandwiched between the disc portion 321 and the reinforcement ring 10.
Therefore, the sealing device 1 can improve the sealing performance.
The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments of the present invention, and includes all embodiments included in the concept of the present invention and the claims of the present invention. Further, the respective configurations may be appropriately selected and combined to achieve at least part of the above-described and problems and effects. For example, the shape, material, arrangement, size, manufacturing method, and the like of each component in the above embodiments may be appropriately changed according to a specific use form of the present invention.
Description of the reference numerals
1 sealing device
10 reinforcing ring
11 inner peripheral end portion
12 outer peripheral end portion
20 elastomeric part
21 lip
22 outer peripheral portion
23 cover part
31 guide rod part
32 outer cylinder
40 shaft part
50 clamping spring
211 dust lip
212 sealing lip
213 inner peripheral surface
221 projection
222 peripheral surface portion
311 recess
321 disc part
Claims (7)
1. A sealing device for sealing between a reciprocating shaft portion and an outer peripheral member formed in a ring shape with an axis as a center on an outer peripheral side of the shaft portion, the sealing device comprising:
a reinforcing ring provided on an inner peripheral side of the outer peripheral member and formed in a disk shape around the axis;
an elastic body portion attached to the reinforcing ring and having a ring shape with the axis as a center, the elastic body portion being formed of an elastic body,
the elastic body portion includes:
a seal lip that covers an inner peripheral end portion of the reinforcement ring from an inner peripheral side and is annular about the axis, the seal lip being in slidable contact with the shaft portion;
an outer peripheral portion that covers an outer peripheral end portion of the reinforcing ring from an outer peripheral side and is annular around the axis, the outer peripheral portion being formed so as to be contactable with the outer peripheral member,
the outer peripheral portion has:
a protruding portion that protrudes to one side with respect to the reinforcing ring in an axial direction;
and an outer peripheral surface portion formed in a ring shape with the axis as a center and contactable with the outer peripheral member.
2. The sealing device of claim 1,
the outer peripheral portion is formed in an annular shape around the axis on an outer peripheral side with respect to an outer peripheral end portion of the reinforcing ring.
3. The sealing device according to claim 1 or 2,
the outer diameter of the reinforcement ring is smaller than the inner diameter of the outer peripheral portion.
4. The sealing device according to claim 1 or 2,
the outer peripheral member has: a guide rod part which forms an annular concave part which is opened to the one side by taking the axis as a center; an outer cylinder provided on an outer peripheral side of the guide rod and having a disk portion extending from an outer peripheral end of the guide rod to an inner peripheral side,
the outer peripheral portion contacts the disk portion of the outer cylinder inside the recess.
5. The sealing device of claim 3,
the outer peripheral member has: a guide rod part which forms an annular concave part which is opened to the one side by taking the axis as a center; an outer cylinder provided on an outer peripheral side of the guide rod and having a disk portion extending from an outer peripheral end of the guide rod to an inner peripheral side,
the outer peripheral portion contacts the disk portion of the outer cylinder inside the recess.
6. The sealing device of claim 4,
the reinforcing ring is provided at a position not overlapping with the disk portion of the outer cylinder in a radial direction.
7. The sealing device of claim 5,
the reinforcing ring is provided at a position not overlapping with the disk portion of the outer cylinder in a radial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921284377.9U CN210739237U (en) | 2019-08-09 | 2019-08-09 | Sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921284377.9U CN210739237U (en) | 2019-08-09 | 2019-08-09 | Sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210739237U true CN210739237U (en) | 2020-06-12 |
Family
ID=71010568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921284377.9U Active CN210739237U (en) | 2019-08-09 | 2019-08-09 | Sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210739237U (en) |
-
2019
- 2019-08-09 CN CN201921284377.9U patent/CN210739237U/en active Active
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