JP2021025612A - Sealing device - Google Patents

Abstract

To provide a sealing device which enables a seal lip part to follow decentering of a shaft member smoothly even under a low-temperature environment.SOLUTION: A sealing device 1 seals an annular gap C between an external cylinder 4a (housing) of a cylinder 4 and a rod 2 (shaft member) at least partially inserted into the external cylinder 4a. The sealing device 1 includes a body part 10 and a movable part 20. The body part 10 has a dust lip part 13 which contacts with the rod 2 and is fixed to the external cylinder 4a. The movable part 20 has a seal lip part 23 which contacts with the rod 2 and can move relative to the body part 10.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sealing device that seals an annular gap between a housing and a shaft member that is at least partially inserted into the housing.

Patent Document 1 discloses, for example, a sealing device attached to an automobile cylinder damper. This sealing device includes a metal ring and an elastomeric sealing portion held by the metal ring. In Patent Document 1, the seal portion integrally includes a dust strip portion and a seal lip portion. Both the dust strip portion and the seal lip portion come into contact with a shaft member (rod) that reciprocates in the axial direction.

Japanese Unexamined Patent Publication No. 2016-001024

By the way, in the above-mentioned sealing device, it is required that the degree of contact of the seal lip portion with the shaft member does not change significantly even if the shaft member is eccentric, in other words, the seal lip portion follows the eccentricity of the shaft member. obtain.

However, for example, when the above-mentioned sealing device is attached to a cylinder damper that can be used in a low temperature environment where the outside air temperature is much lower than 0 ° C., not only the dust strip portion is hardened in this low temperature environment, but also the dust strip portion is hardened. The seal lip part integrated with the dust strip part may also be hardened. There was a concern that the hardening of the seal lip portion might affect the followability of the seal lip portion with respect to the eccentricity of the shaft member.

Therefore, an object of the present invention is to provide a sealing device in which the seal lip portion can satisfactorily follow the eccentricity of the shaft member even in a low temperature environment.

According to one aspect of the invention, there is provided a sealing device that seals an annular gap between the housing and a shaft member that is at least partially inserted into the housing. The sealing device includes a main body portion having a dust strip portion abutting on the shaft member and being fixed to the housing, and a movable portion having a seal lip portion abutting on the shaft member and being movable relative to the main body portion. To be equipped.

According to one aspect of the present invention, it is possible to provide a sealing device in which the seal lip portion can satisfactorily follow the eccentricity of the shaft member even in a low temperature environment.

It is sectional drawing of the sealing device in the state which the rod is not eccentric in the 1st Embodiment of this invention. It is sectional drawing of the sealing device in the state which the rod is eccentric in the 1st Embodiment. It is sectional drawing of the sealing device in the state which the rod is not eccentric in the 2nd Embodiment of this invention. It is sectional drawing of the sealing device in the state which the rod is eccentric in the 2nd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are cross-sectional views of the sealing device 1 according to the first embodiment of the present invention. Here, FIG. 1 shows a sealing device 1 in a state in which the rod 2 is not eccentric (in other words, a state in which the center line P of the rod 2 coincides with the center line S of the cylinder 4). FIG. 2 shows a sealing device 1 in a state where the rod 2 is eccentric (in other words, a state in which the center line P of the rod 2 is deviated from the center line S of the cylinder 4). Here, FIG. 2 shows a state in which the center line P of the rod 2 is deviated from the center line S of the cylinder 4 to the left of the paper surface as an example of the eccentric state of the rod 2. In this respect, it goes without saying that there may be an eccentric state of the rod 2 other than that shown in FIG. In the present embodiment, the rod 2 corresponds to the "shaft member" of the present invention.

In the present embodiment, the mounting target of the sealing device 1 will be described below assuming that the piston type cylinder damper 3 is mounted. However, the mounting target of the sealing device 1 is not limited to the cylinder damper 3. Here, the cylinder damper 3 can be used as a shock absorber capable of absorbing vibration generated by an external force in various vehicles including automobiles, industrial equipment, or the construction field.

In the present embodiment, it will be described below assuming that the extending direction of the center line P of the rod 2 and the extending direction of the center line S of the cylinder 4 are each in the vertical direction. However, the extending direction of the center line P of the rod 2 and the extending direction of the center line S of the cylinder 4 are not limited to the vertical direction.

In the present embodiment, the cylinder damper 3 to which the sealing device 1 is mounted will be described below assuming that the cylinder damper 3 is a double cylinder type cylinder damper. However, the cylinder damper 3 to which the sealing device 1 is mounted may be a single cylinder type cylinder damper.

The cylinder damper 3 reciprocates in the axial direction with at least a part inserted into the cylinder 4 having the outer cylinder 4a and the inner cylinder (not shown) and the cylinder 4 (particularly the inner cylinder) arranged concentrically. The rod 2 is provided, and the rod guide 5 that guides the reciprocating movement of the rod 2 is provided. An object to be sealed is sealed in the cylinder 4. Here, the object to be sealed is, for example, a fluid containing oil and / or gas. The rod guide 5 is inserted in the vicinity of the open end 4b of the outer cylinder 4a and is attached to the open end (not shown) of the inner cylinder. A piston (not shown) is attached to an end portion (the other end portion described later) of the rod 2 in the inner cylinder. Here, in the present embodiment, the outer cylinder 4a, which is a cylinder, corresponds to the "housing" of the present invention.

In the cylinder damper 3, a sealing device 1 is attached to the open end portion 4b of the outer cylinder 4a so that the object to be sealed in the cylinder 4 does not leak out of the cylinder 4 through the outer peripheral surface of the rod 2. The sealing device 1 can seal the annular gap C between the inner peripheral surface of the open end portion 4b of the outer cylinder 4a and the outer peripheral surface of the rod 2 in which at least a part of the outer cylinder 4a is inserted. Here, in FIGS. 1 and 2, the region above the sealing device 1 (the outer region of the outer cylinder 4a) is referred to as "atmospheric region T1". Further, in FIGS. 1 and 2, a region below the sealing device 1 (internal region of the outer cylinder 4a) is referred to as a “sealing region T2”. The rod guide 5 is located in the sealed region T2.

The sealing device 1 includes a main body portion 10 and a movable portion 20. The main body 10 partitions the atmospheric region T1 and the sealed region T2. The main body 10 is annular in a plan view. The movable portion 20 is arranged on the side of the main body portion 10 facing the sealed region T2. The movable portion 20 is annular in a plan view. The movable portion 20 can move relative to the main body portion 10 in a direction substantially orthogonal to the axial direction of the rod 2. Here, the axial direction of the rod 2 may include the extending direction of the center line P of the rod 2. In the present embodiment, the radial direction corresponds to the direction substantially orthogonal to the axial direction of the rod 2.

The main body portion 10 has a metal reinforcing ring 11 and an elastic portion 12 made of an elastomer (for example, rubber). The elastic portion 12 is adhered to the reinforcing ring 11. The elastic portion 12 has a dust strip portion 13, a recess 14, and an outer peripheral lip portion 15. Of the elastic portions 12, at least the dust strip portion 13 and the outer peripheral lip portion 15 have flexibility.

The reinforcing ring 11 includes a first flat surface portion 11a, a second flat surface portion 11b, and a connecting surface portion 11c. The first plane portion 11a is annular in a plan view. The rod 2 can be inserted into the central hole of the first flat surface portion 11a. The inner peripheral portion of the connecting surface portion 11c is smoothly connected to the outer peripheral portion of the first flat surface portion 11a. The connecting surface portion 11c is inclined downward from the inner peripheral portion toward the outer peripheral portion (that is, toward the outer side in the radial direction). The outer peripheral portion of the connecting surface portion 11c is smoothly connected to the inner peripheral portion of the second flat surface portion 11b. The second plane portion 11b is also annular in a plan view. Therefore, in the reinforcing ring 11, the first plane portion 11a is located above the second plane portion 11b.

The outer peripheral portion of the upper surface of the second flat surface portion 11b of the reinforcing ring 11 may abut on the inward flange 4c formed on the open end portion 4b of the outer cylinder 4a. An outer peripheral lip portion 15 is provided on the lower surface of the outer peripheral portion of the second flat surface portion 11b of the reinforcing ring 11. When the sealing device 1 is press-fitted into the outer cylinder 4a, the protrusion 15a of the outer peripheral lip portion 15 is pressed by the inner peripheral surface of the outer cylinder 4a. As a result, the main body portion 10 can be held by the elastic restoring force of the outer peripheral lip portion 15 in a state where the outer peripheral lip portion 15 is bent inward in the radial direction of the outer cylinder 4a. In addition to this, the outer peripheral portion of the main body portion 10 may be sandwiched between the inward flange 4c of the outer cylinder 4a and the rod guide 5. In this way, the main body 10 of the sealing device 1 can be fixed to the outer cylinder 4a at the outer peripheral portion thereof. When the main body 10 of the sealing device 1 is fixed to the outer cylinder 4a, the center line of the central hole of the first flat surface portion 11a of the main body 10 coincides with the center line S of the cylinder 4 described above.

A dust strip portion 13 which is an auxiliary lip portion is provided on the inner peripheral portion of the upper surface of the first flat surface portion 11a of the reinforcing ring 11. The dust strip portion 13 has a function of preventing foreign matter from entering the sealed region T2 from the atmospheric region T1. In other words, the dust strip portion 13 has a function of preventing foreign matter from entering the inside of the outer cylinder 4a from the outside of the outer cylinder 4a through the outer peripheral surface of the rod 2. The dust strip portion 13 extends upward (closer to one end of the rod 2) and radially inward over the entire circumference from the inner peripheral portion of the upper surface of the first flat surface portion 11a of the reinforcing ring 11. A dust strip 17 protruding inward in the radial direction is formed at the tip of the dust strip portion 13. The dust strip 17 can come into contact with the outer peripheral surface of the rod 2 that reciprocates in the axial direction over the entire circumference. The rod 2 can slide in the axial direction with respect to the dust strip 17 while being in contact with the dust strip 17. Here, the dust strip 17 is located above the inward flange 4c of the outer cylinder 4a.

A recess 14 of the elastic portion 12 is provided on the lower surface of the first flat portion 11a of the reinforcing ring 11. The recess 14 is open downward. The recess 14 has an annular ceiling surface 14a in a plan view and a side surface 14b extending downward from the outer peripheral portion of the ceiling surface 14a. The side surface 14b is inclined inward in the radial direction toward the lower side. Here, the annular ceiling surface 14a and the reinforcing ring 11 are arranged concentrically. The rod 2 can be inserted into the central hole of the ceiling surface 14a of the recess 14. The recess 14 accommodates the support portion 25 of the movable portion 20.

The elastic portion 12 is formed with an annular lower surface 12a so that the lower end portion of the recess 14 and the inner peripheral portion of the outer peripheral lip portion 15 are continuous. The convex portion 33b of the flange portion 33, which will be described later, may come into contact with the lower surface 12a.

The movable portion 20 has a metal reinforcing ring 21 and an elastic portion 22 made of an elastomer (for example, rubber). The elastic portion 22 is adhered to the reinforcing ring 21. The elastic portion 22 has a seal lip portion 23 and a base portion 24. Of the elastic portions 22, at least the seal lip portion 23 has flexibility.

The reinforcing ring 21 is annular in a plan view. The rod 2 can be inserted into the central hole of the reinforcing ring 21.

A seal lip portion 23 is provided on the inner peripheral portion of the lower surface of the reinforcing ring 21. The seal lip portion 23 has a function of preventing leakage of the sealed object from the sealed region T2 to the atmospheric region T1. In other words, the seal lip portion 23 has a function of preventing the sealed object in the outer cylinder 4a from leaking out of the outer cylinder 4a through the outer peripheral surface of the rod 2. The seal lip portion 23 is located inward (below) the outer cylinder 4a with respect to the dust strip portion 13. The seal lip portion 23 extends downward (closer to the other end of the rod 2) and radially inward over the entire circumference from the inner peripheral portion of the lower surface of the reinforcing ring 21. A main seal lip 26 projecting inward in the radial direction is formed at the tip of the seal lip portion 23. The main seal lip 26 can come into contact with the outer peripheral surface of the rod 2 that reciprocates in the axial direction over the entire circumference. The rod 2 can slide in the axial direction with respect to the main seal lip 26 while being in contact with the main seal lip 26.

A sub-seal lip 27 projecting inward in the radial direction is formed above the main seal lip 26 in the seal lip portion 23. The sub-seal lip 27 can come into contact with the outer peripheral surface of the rod 2 that reciprocates in the axial direction over the entire circumference. The rod 2 can slide in the axial direction with respect to the sub-seal lip 27 while being in contact with the sub-seal lip 27.

A storage groove 29 for accommodating the garter spring 28 is formed on the radial side of the main seal lip 26 in the seal lip portion 23. Due to the elastic restoring force of the garter spring 28, the tense force of the main seal lip 26 in contact with the outer peripheral surface of the rod 2 can be well maintained.

The base 24 of the elastic portion 22 is provided so as to cover the surface of the reinforcing ring 21. In the present embodiment, the portion of the movable portion 20 composed of the reinforcing ring 21 and the base portion 24 is referred to as a “support portion 25”. The support portion 25 has a function of supporting the seal lip portion 23. The rod 2 can be inserted through the central hole of the support portion 25.

The support portion 25 has an annular upper surface 25a in a plan view and a side surface 25b extending downward from the outer peripheral portion of the upper surface 25a. The upper surface 25a of the support portion 25 faces the ceiling surface 14a of the recess 14 of the main body portion 10. The side surface 25b of the support portion 25 faces the side surface 14b of the recess 14 of the main body portion 10. Here, the side surface 25b of the support portion 25 is inclined inward in the radial direction toward the lower side.

A convex portion 25c that abuts on the ceiling surface 14a is formed on the upper surface 25a of the support portion 25 (in other words, the surface of the support portion 25 that faces the ceiling surface 14a of the recess 14 of the main body portion 10). The convex portion 25c includes the circumference of the central hole of the upper surface 25a of the support portion 25, the circumference of the central hole of the ceiling surface 14a of the concave portion 14 of the main body portion 10, and the circumference of the outer peripheral surface of the rod 2 inserted into these central holes. It is formed in an annular shape so as to surround the. The convex portion 25c has a function of sealing the gap between the upper surface 25a of the support portion 25 and the ceiling surface 14a of the concave portion 14 of the main body portion 10. The convex portion 25c is preferably formed integrally with the base portion 24 constituting the support portion 25.

In the present embodiment, the upper surface 25a of the support portion 25 is formed with a convex portion 25c that seals the gap between the upper surface 25a of the support portion 25 and the ceiling surface 14a of the concave portion 14 of the main body portion 10. In place of or in addition to the convex portion 25c, another convex portion (shown) that seals the gap between the upper surface 25a of the support portion 25 and the ceiling surface 14a of the concave portion 14 of the main body portion 10. May be formed on the ceiling surface 14a of the recess 14 of the main body 10. The other convex portion is preferably formed integrally with the ceiling surface 14a of the concave portion 14 of the main body portion 10.

In the present embodiment, in the non-eccentric state of the rod 2 shown in FIG. 1, there is a radial gap K between the side surface 25b of the support portion 25 and the side surface 14b of the recess 14 of the main body portion 10 over the entire circumference. Is set to. This gap K can be set to exceed the expected eccentricity of the rod 2.

In the present embodiment, the outer diameter of most of the side surface 25b of the support portion 25 is larger than the inner diameter of the lower end portion of the side surface 14b of the recess 14 of the main body portion 10. Therefore, in the present embodiment, the inclined side surface 25b of the support portion 25 and the inclined side surface 14b of the recess 14 of the main body portion 10 can cooperate with each other to prevent the support portion 25 from coming off from the recess 14. .. Therefore, the sealing device 1 includes a pull-out prevention portion 30 for preventing the support portion 25 from coming off from the recess 14. The pull-out prevention portion 30 may be composed of an inclined side surface 25b of the support portion 25 and an inclined side surface 14b of the recess 14 of the main body portion 10.

The support portion 25 has an annular collar portion 33 in a plan view. The flange portion 33 projects radially outward from the outer peripheral portion of the lower end portion of the support portion 25 over the entire circumference. The collar portion 33 may be integrally formed with the base portion 24 constituting the support portion 25. Therefore, the collar portion 33 is made of an elastomer (for example, made of rubber).

A convex portion 33b in contact with the lower surface 12a is formed on the upper surface 33a of the collar portion 33 (in other words, the surface of the collar portion 33 facing the lower surface 12a of the elastic portion 12 of the main body portion 10). The convex portion 33b is formed in an annular shape so as to surround the concave portion 14 of the main body portion 10. The convex portion 33b has a function of sealing the gap between the upper surface 33a of the flange portion 33 and the lower surface 12a of the elastic portion 12 of the main body portion 10. The convex portion 33b is preferably formed integrally with the flange portion 33.

In the present embodiment, a convex portion 33b is formed on the upper surface 33a of the collar portion 33 to seal the gap between the upper surface 33a of the collar portion 33 and the lower surface 12a of the elastic portion 12 of the main body portion 10. In place of or in addition to the convex portion 33b, another convex portion (shown) that seals the gap between the upper surface 33a of the flange portion 33 and the lower surface 12a of the elastic portion 12 of the main body portion 10. May be formed on the lower surface 12a of the elastic portion 12 of the main body portion 10. The other convex portion is preferably formed integrally with the lower surface 12a of the elastic portion 12 of the main body portion 10.

As shown in FIG. 2, when the rod 2 is eccentric to the left of the paper surface (in other words, when the center line P of the rod 2 is displaced to the left of the paper surface with respect to the center line S of the cylinder 4), the rod 2 Following the eccentricity of the rod 2, the entire movable portion 20 moves relative to the main body portion 10 to the left of the paper surface (that is, in a direction substantially orthogonal to the axial direction of the rod 2). In this way, regarding the sealing device 1, even if the rod 2 is eccentric (in other words, even if the center line P of the rod 2 deviates from the center line S of the cylinder 4), this Following the eccentricity of the rod 2, the entire movable portion 20 moves relative to the main body portion 10. Therefore, it is possible to maintain an appropriate contact state between the main seal lip 26 and the sub seal lip 27 of the seal lip portion 23 with respect to the outer peripheral surface of the rod 2.

According to the present embodiment, the sealing device 1 seals the annular gap C between the outer cylinder 4a (housing) and the rod 2 (shaft member) at least partially inserted into the outer cylinder 4a. The sealing device 1 has a main body portion 10 having a dust strip portion 13 in contact with the rod 2 and being fixed to the outer cylinder 4a, and a seal lip portion 23 in contact with the rod 2 and is relative to the main body portion 10. A movable portion 20 that can be moved is provided. Therefore, even if the main body 10 is hardened in a low temperature environment, the movable portion 20 can move relative to the main body 10 following the eccentricity of the rod 2. Therefore, the seal lip portion 23 can satisfactorily follow the eccentricity of the rod 2 even in a low temperature environment.

Further, according to the present embodiment, the movable portion 20 can move relative to the main body portion 10 in a direction substantially orthogonal to the axial direction of the rod 2 (that is, in the radial direction). Therefore, even if the rod 2 is eccentric in a direction substantially orthogonal to the axial direction of the rod 2, the movable portion 20 can move relative to the main body portion 10 so as to follow the eccentricity.

Further, according to the present embodiment, the movable portion 20 has a support portion 25 that supports the seal lip portion 23. The main body 10 has a recess 14 for accommodating the support 25. There is a gap K between the recess 14 and the support portion 25 in a direction substantially orthogonal to the axial direction of the rod 2 (that is, in the radial direction). Therefore, even if the rod 2 is eccentric in all directions, the seal lip portion 23 can be made to follow the eccentricity satisfactorily.

Further, according to the present embodiment, the sealing device 1 includes a pull-out prevention portion 30 for preventing the support portion 25 from coming off from the recess 14. As a result, it is possible to prevent the main body portion 10 and the movable portion 20 from being separated from each other.

Further, according to the present embodiment, the support portion 25 has a flange portion 33 projecting from the support portion 25 in a direction substantially orthogonal to the axial direction of the rod 2 (that is, in the radial direction). On the surface (upper surface 33a) of the collar portion 33 facing the main body portion 10, a convex portion 33b that abuts on the main body portion 10 is formed so as to surround the periphery of the concave portion 14. The convex portion 33b can seal the gap between the upper surface 33a of the flange portion 33 and the main body portion 10. Further, the collar portion 33 itself can function as a lid for closing the gap between the support portion 25 and the recess 14.

Next, the second embodiment of the present invention will be described with reference to FIGS. 3 and 4.

3 and 4 are cross-sectional views of the sealing device 1 in the present embodiment. Here, FIG. 3 shows a sealing device 1 in a state in which the rod 2 is not eccentric (in other words, a state in which the center line P of the rod 2 coincides with the center line S of the cylinder 4). FIG. 4 shows a sealing device 1 in a state where the rod 2 is eccentric (in other words, a state in which the center line P of the rod 2 is deviated from the center line S of the cylinder 4). Here, FIG. 4 shows a state in which the center line P of the rod 2 is deviated from the center line S of the cylinder 4 to the left of the paper surface as an example of the eccentric state of the rod 2. In this respect, it goes without saying that there may be an eccentric state of the rod 2 other than that shown in FIG.

The points different from the above-described first embodiment will be described.

In the present embodiment, the notch 37 is recessed in the outer peripheral portion of the lower end portion of the support portion 25 (particularly the base portion 24) of the movable portion 20. The cutout portion 37 is annular in a plan view. The portion of the reinforcing ring 21 corresponding to the notch 37 is exposed. An annular pull-out prevention member 38 is in contact with the cutout portion 37 including the exposed portion of the reinforcing ring 21 in a plan view. The pull-out prevention member 38 comes into contact with the notch 37 at its inner peripheral portion. The outer peripheral portion of the pull-out prevention member 38 is fixed (for example, adhered) to the lower surface 12a of the elastic portion 12 of the main body portion 10. The pull-out prevention member 38 is made of, for example, resin or metal. In the present embodiment, for example, after the support portion 25 of the movable portion 20 is housed in the recess 14 of the elastic portion 12 of the main body portion 10, the outer peripheral portion of the pull-out prevention member 38 is placed on the lower surface 12a of the elastic portion 12 of the main body portion 10. Can be fixed.

In the present embodiment, in the non-eccentric state of the rod 2 shown in FIG. 3, there is a radial gap K'between the vertical surface 37a of the notch 37 and the inner peripheral surface 38a of the removal prevention member 38 over the entire circumference. Is set to be free. This gap K'can be set so as to exceed the assumed eccentricity of the rod 2.

In particular, according to the present embodiment, the sealing device 1 includes a pull-out prevention member 38 as a pull-out prevention portion 30'that prevents the support portion 25 from coming off from the recess 14. As a result, it is possible to prevent the main body portion 10 and the movable portion 20 from being separated by a simple configuration.

In the present embodiment, both the side surface 25b of the support portion 25 of the movable portion 20 and the side surface 14b of the recess 14 of the main body portion 10 are inclined inward in the radial direction toward the lower side. However, both the side surface 25b of the support portion 25 of the movable portion 20 and the side surface 14b of the recess 14 of the main body portion 10 may be inclined outward in the radial direction toward the lower side. Alternatively, the side surface 25b of the support portion 25 of the movable portion 20 and the side surface 14b of the recess 14 of the main body portion 10 may both extend substantially parallel to the center line S of the cylinder 4.

In the first and second embodiments described above, the accommodating groove 29 and the garter spring 28 of the seal lip portion 23 may be omitted. In the first and second embodiments described above, the sub-seal lip 27 of the seal lip portion 23 may be omitted. In the first and second embodiments described above, a plurality of dust strips 17 may be formed on the dust strip portion 13 at intervals in the axial direction of the rod 2.

In the first and second embodiments described above, in the cylinder damper 3, a reservoir chamber (not shown) may be formed by being partitioned by an outer cylinder 4a and an inner cylinder. The rod guide 5 may have a continuous passage (not shown) for returning the sealed object that has flowed out from the inner cylinder through the outer peripheral surface of the rod 2 to the reservoir chamber as the rod 2 reciprocates. In the first and second embodiments described above, the check lip portion (not shown) that is openable and closable and has flexibility is integrated with the lower surface 12a of the elastic portion 12 of the main body portion 10. May be formed in. This check lip portion can function as a check valve that allows the sealed object that has flowed out from the inner cylinder through the outer peripheral surface of the rod 2 to flow only in the direction of returning to the reservoir chamber.

In the first and second embodiments described above, the cylinder damper 3 has been described as an example of the mounting target of the sealing device 1. However, the mounting target of the sealing device 1 is not limited to the cylinder damper 3. Further, the object to be sealed is not limited to oil and gas, but may be grease.

In the first and second embodiments described above, the rod 2 slidable in the axial direction has been described as an example of the shaft member that abuts on the dust strip portion 13 and the seal lip portion 23. In addition, the shaft member that comes into contact with the dust strip portion 13 and the seal lip portion 23 may be a shaft member that can rotate around the shaft center line. That is, with respect to the shaft member that abuts on the dust strip portion 13 and the seal lip portion 23, any aspect that can operate relative to the dust strip portion 13 and the seal lip portion 23 can be assumed.

The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various modifications and modifications can be made based on the technical idea of the present invention.

1 ... Sealing device, 2 ... Rod (shaft member), 3 ... Cylinder damper, 4 ... Cylinder, 4a ... Outer cylinder (housing), 4b ... Open end, 4c ... Inward flange, 5 ... Rod guide, 10 ... Main body Part, 11 ... Reinforcing ring, 11a ... First plane part, 11b ... Second plane part, 11c ... Connection surface part, 12 ... Elastic part, 12a ... Bottom surface, 13 ... Dustrip part, 14 ... Recession, 14a ... Ceiling surface, 14b ... side surface, 15 ... outer peripheral lip part, 15a ... protrusion, 17 ... dust strip, 20 ... movable part, 21 ... reinforcing ring, 22 ... elastic part, 23 ... seal lip part, 24 ... base, 25 ... support part, 25a ... Top surface, 25b ... Side surface, 25c ... Convex part, 26 ... Main seal lip, 27 ... Secondary seal lip, 28 ... Garter spring, 29 ... Storage groove, 30, 30'... Removal prevention part, 33 ... Flange part, 33a ... Top surface, 33b ... Convex part, 37 ... Notch part, 37a ... Vertical surface, 38 ... Detachment prevention member, 38a ... Inner peripheral surface, C ... Circular gap, K, K'... Gap, P, S ... Center line, T1 ... atmospheric region, T2 ... sealed region

Claims (5)

A sealing device that seals an annular gap between a housing and a shaft member that is at least partially inserted into the housing.
A main body portion having a dust strip portion that abuts on the shaft member and being fixed to the housing,
A movable portion having a seal lip portion that abuts on the shaft member and being movable relative to the main body portion,
A sealing device. The sealing device according to claim 1, wherein the movable portion can move relative to the main body portion in a direction substantially orthogonal to the axial direction of the shaft member. The movable portion further has a support portion that supports the seal lip portion.
The main body further has a recess for accommodating the support.
The sealing device according to claim 2, wherein there is a gap between the recess and the support portion in a direction substantially orthogonal to the axial direction. The sealing device according to claim 3, further comprising a pull-out prevention portion for preventing the support portion from coming off from the recess. The support portion has a collar portion that projects from the support portion in a direction substantially orthogonal to the axial direction.
The sealing device according to claim 3 or 4, wherein a convex portion abutting the main body portion is formed on the surface of the collar portion facing the main body portion so as to surround the periphery of the concave portion.