JP3192593U - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device capable of preventing erroneous assembly and reliably exhibiting an inherent sealing property. A sealing device (10) includes a metal ring (20) and an elastomer-made sealing portion (30) held by the metal ring (20). The seal portion 30 is arranged on the outer A side of the seal lip 31 with respect to the axial direction of the rod 4 and the seal lip 31 which abuts on the rod 4 which is an adherend to seal the sealing target, and abuts on the rod 4 to the outside. It is provided with a dust strip 32 that prevents foreign matter from entering from the A side to the sealing target side. The seal portion 30 has at least one identified portion 35 in the vicinity of the surface of the metal ring 20 facing the outer A side. [Selection diagram] Fig. 2

Description

  The present invention relates to a shock absorber sealing device that reduces vibration of a structure.

  2. Description of the Related Art Conventionally, shock absorbers for absorbing vibrations generated by external forces have been widely used in automobiles, industrial equipment, and construction fields. As the shock absorber, for example, there is a piston-type cylinder damper having a cylinder in which a sealing target such as hydraulic oil or gas is sealed, and a rod that is reciprocally accommodated in the cylinder. Fixed to different structures, periodic vibrations caused by the relative motion of these structures are damped by the fluid resistance of the object to be sealed. In such a piston-type shock absorber, a sealing device is attached to the shaft sealing portion at one end of the cylinder so as not to leak the object to be sealed from the surface of the reciprocating rod.

  FIG. 4 is a longitudinal sectional view showing a configuration of a conventional sealing device 100.

  As shown in FIG. 4, the conventional sealing device 100 includes a main seal lip 120 and a dust lip 130 that are integrally formed with a rubber-like elastic body on the inner periphery of a metal reinforcing ring 110. The main seal lip 120 arranged on the sealing target B side has an inner peripheral edge portion 120a in close contact with the outer peripheral surface of the rod 200, so that the sealing target fluid (for example, oil) existing on the sealing target B side is outside A side. To prevent leakage. The dust lip 130 prevents the foreign matter from entering the sealing object B side from the outside A side by bringing the inner peripheral edge portion 130 a into close contact with the outer peripheral surface of the rod 200. Further, a spring 140 for applying an appropriate pressing force to the rod 200 is mounted on the outer periphery of the main seal lip 120, and a spring for applying an appropriate pressing force to the rod 200 on the outer periphery of the dust lip 130. 150 is installed. By providing the two springs 140 and 150 in this manner, the pressing force of the main seal lip 120 and the dust lip 130 against the rod 200 can be increased to improve the sealing performance, and the pressing force can be maintained. Yes.

  However, in the conventional sealing device 100, since the two springs 140 and 150 are disposed substantially symmetrically with respect to the reinforcing ring 110, it is difficult to correctly recognize the direction (inside / outside) in appearance. For this reason, there is a high possibility that an operator will assemble the sealing device 100 by mistake, and the sealing performance inherent in the sealing device 100 cannot be exhibited.

  An object of the present invention is to provide a sealing device that can prevent erroneous assembly and can reliably exhibit the inherent sealing performance.

  In order to achieve the above object, a sealing device of the present invention is a sealing device including a metal ring and an elastomeric seal portion held by the metal ring, and the seal portion is an adherend. A seal lip that abuts against the rod to seal the object to be sealed, and is disposed on the outside of the seal lip with respect to the axial direction of the rod, and abuts against the rod to prevent foreign matter from entering from the outside to the object to be sealed. A dust strip is provided, and the seal portion has at least one identified portion in the vicinity of the surface of the metal ring facing the outside.

  It is preferable that the to-be-identified part is constituted by a concave part and / or a convex part.

  Moreover, it is preferable that the said to-be-identified part is arrange | positioned substantially cyclic | annular centering on the said rod.

  Further, it is more preferable that the identified portion includes two ridges arranged side by side in the radial direction.

  Furthermore, it is preferable that the identified portion has a color given in a color different from that of the seal portion.

  The seal device further includes a first garter spring fitted on the radially outer peripheral side of the seal lip and a second garter spring fitted on the radially outer peripheral side of the dust lip.

  Moreover, the said seal part is further equipped with the extension part extended to the sealing object side in the surface vicinity of the said metal ring which faced the sealing object side.

  The extension portion is disposed in a flow path formed by the metal ring and a rod guide disposed on a sealing target side of the metal ring, and a check valve that allows a flow of the sealing target in one direction. It is preferable that

  Moreover, it is preferable that the said sealing apparatus is attached to the rod of a cylinder damper for vehicles.

  Further, it is more preferable that the sealing device is attached to a double cylinder type cylinder damper constituting a suspension of an automobile.

  According to the present invention, the seal lip contacts the rod as the adherend to seal the object to be sealed, and the dust lip contacts the rod to prevent foreign matter from entering from the outside to the object to be sealed. . And it has at least 1 to-be-identified part in the exterior side surface vicinity of the metal ring which comprises a sealing device. Thus, when the sealing device is assembled to the rod, the operator can recognize the orientation of the sealing device correctly and easily by recognizing the identified portion. Therefore, when the sealing device is assembled to the rod, the sealing device can be attached to the rod in the correct orientation, and the inherent sealing performance can be reliably exhibited. Further, it is possible to prevent erroneous assembly, and even if erroneous assembly occurs, it is possible to easily determine erroneous assembly in a subsequent process.

  Moreover, the to-be-identified part is comprised by the recessed part and / or the convex part in the outer side surface vicinity of the metal ring. For this reason, when assembling the sealing device to the rod, the operator can visually or tactilely recognize the concave portion and / or convex portion formed in the vicinity of the outer surface of the metal ring. The direction can be determined more accurately.

  The identified portion is arranged in a substantially annular shape with the rod as the center. Furthermore, the part to be identified is composed of two ridges arranged side by side in the radial direction. For this reason, when assembling the sealing device to the rod, the operator can surely recognize the identified portion visually or tactilely from any direction around the axis of the rod.

  Further, the identified portion is a color given in a color different from that of the seal portion. For this reason, when assembling the sealing device to the rod, the operator can surely recognize the identified portion visually by color, and can reliably prevent erroneous assembly when assembling the sealing device to the rod. .

  In particular, even when two garter springs are provided in the sealing device, the correct assembly direction of the sealing device can be determined more accurately.

  In addition, when a check valve is provided in the sealing device, if the sealing device is not assembled in the correct orientation (the direction in which the extension part faces the sealing target), the cylinder damper that is the adherend functions as the original function. Can not demonstrate. According to the sealing device of the present invention, the check valve can be arranged in the correct direction, and the original function of the sealing device can be exhibited normally.

  In particular, the above-described effect can be reliably achieved by attaching the sealing device as described above to a double cylinder type cylinder damper that constitutes a suspension of an automobile.

It is a longitudinal cross-sectional view which shows the structure of the cylinder damper to which the sealing device which concerns on embodiment of this invention is attached. It is a longitudinal cross-sectional view which shows schematically the structure of the sealing device in FIG. It is a longitudinal cross-sectional view which shows the modification of the sealing device of FIG. It is a longitudinal cross-sectional view which shows the structure of the conventional sealing apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a longitudinal sectional view showing a configuration of a cylinder damper to which a sealing device according to an embodiment of the present invention is attached. The sealing device of the present invention is used in various vehicles, particularly automobiles, and is attached to a rod for the purpose of sealing a hydraulic oil composition (hereinafter referred to as a sealing object) such as oil filled in a cylinder damper. Hereinafter, a multi-cylinder cylinder damper will be described as an example.

  In FIG. 1, a cylinder damper 1 includes a cylinder 2 having an inner cylinder 2a and an outer cylinder 2b arranged substantially concentrically with each other, and an open end of the inner cylinder 2a while being inserted into the inner periphery near the opening end of the outer cylinder 2b. The rod guide 3 attached to the rod guide 3, the rod 4 inserted through the center hole of the rod guide 3 and reciprocating in the inner cylinder 2a in the axial direction (vertical direction in FIG. 1), attached to the lower end of the rod 4, A piston 5 that slides in the axial direction on the inner peripheral surface of the cylinder 2a, and a sealing device 10 that is disposed on the axially outer side of the rod guide 3 and at the axial end of the outer cylinder 2b are provided.

  The inner cylinder 2a of the cylinder 2 is filled with the sealing object 6, and the reservoir chamber 2c formed by the inner cylinder 2a and the outer cylinder 2b is filled with the sealing object 6 and the gas 7. In addition, a communication path 2d is formed at the lower end of the inner cylinder 2a to enable the sealed object 6 to communicate between the inner cylinder 2a and the reservoir chamber 2c.

  The rod guide 3 forms a flow path 8 between the rod guide 3 and the sealing device 10 arranged on the outer side in the axial direction. Further, the rod guide 3 is connected to return the sealed object 6 that has flowed out of the inner cylinder 2a into the flow path 8 through the outer peripheral surface 4a of the rod 4 to the reservoir chamber 2c as the rod 4 reciprocates. It has a passage 3a.

  The piston 5 defines an upper chamber 2e and a lower chamber 2f in the inner cylinder 2a filled with the sealing object 6. The piston 5 has a valve portion 5a that allows the sealed object 6 to communicate between the upper chamber 2e and the lower chamber 2f.

  In the cylinder damper 1, for example, when the rod 4 moves to the outside (the direction in which the rod 4 is extracted from the cylinder 2), the piston 5 moves upward, the volume of the upper chamber 2e decreases, and the lower chamber 2f Volume increases. At this time, the pressure in the upper chamber 2e increases and the pressure in the lower chamber 2f decreases. With the pressure fluctuations in the upper chamber 2e and the lower chamber 2f, the sealing object 6 in the upper chamber 2e flows into the lower chamber 2f through the valve portion 5a of the piston 5, and at the same time, the sealing in the reservoir chamber 2c. The object 6 flows into the lower chamber 2f through the communication path 2d of the inner cylinder 2. In this operation, a fluid resistance is generated when the sealed object 6 flows through the valve portion 5a of the piston 2, and a damping force against the reciprocation of the rod 4 is generated by the fluid resistance. Further, in order to prevent cavitation (bubble generation) in the sealed object 6 held in the lower chamber 2f, it is necessary to quickly replenish the sealed object 6 from the reservoir chamber 2c to the lower chamber 2f. For this reason, the pressure is constantly applied to the object 6 to be sealed in the reservoir chamber 2c by the gas 7, and the communication path 2d is configured not to obstruct the flow of the object 6 to be sealed as much as possible.

  On the other hand, when the rod 4 moves inward (in the direction in which the rod 4 is inserted into the cylinder 2), the piston 5 moves downward, increasing the volume of the upper chamber 2e and decreasing the volume of the lower chamber 2f. . At this time, the pressure in the upper chamber 2e decreases, and the pressure in the lower chamber 2f increases. Along with the pressure fluctuations in the upper chamber 2e and the lower chamber 2f, the sealed object 6 in the lower chamber 2f flows into the reservoir chamber 2c through a valve portion (not shown) provided at the lower end of the inner cylinder 2a. At the same time, the sealing object 6 in the lower chamber 2 f also flows into the upper chamber 2 e through a communication path (not shown) provided in the piston 5. Also in this operation, a damping force against the reciprocation of the rod 4 is generated by the fluid resistance when the sealing object 6 flows through a valve portion (not shown) of the inner cylinder 2a. Further, a communication path (not shown) provided in the piston 5 is configured so as not to disturb the flow of the sealing object 6 as much as possible.

  FIG. 2 is a longitudinal sectional view schematically showing the configuration of the sealing device 10 in FIG. 2 shows an example thereof, and the configuration of the sealing device according to the present invention is not limited to that shown in FIG.

  As shown in FIG. 2, the sealing device 10 includes a metal ring 20, an elastomer seal 30 held by the metal ring 20, and two garter springs 40 and 41 fitted to the seal 30. Is provided. The seal device 10 is a substantially annular member. When the rod 4 as an adherend is inserted into the annular space, the inner peripheral portion of the seal portion 30 is moved to the rod 4 by the restoring force of the garter springs 40 and 41. Is pressed against the outer peripheral surface 4a.

  The metal ring 20 is disposed substantially concentrically with the rod 4 and is fixed to one end of the outer cylinder 2b. The outer peripheral portion 20a of the metal ring 20 is fixed to the outer cylinder 2b in a state where a compressive force is applied to the upper surface 20b by the inward flange 2b 'of the outer cylinder 2b. When the metal ring 20 is fixed, for example, after the sealing device 10 is press-fitted to a predetermined position in the outer cylinder 2b, the upper end portion of the outer cylinder 2b extending to the outer A side is radially inward (direction toward the rod 4). ) To form an inward flange 2b ′. The rod guide 3 is disposed below the metal ring 20, and a check valve and a fitting portion, which will be described later, vulcanized and bonded to the lower surface 20 c of the metal ring 20 are in pressure contact with the rod guide 3. Further, the seal portion 30 is vulcanized and bonded to the metal ring 20.

  The seal portion 30 is disposed on the radially inner side of the metal ring 20, and is disposed on the radially inner side of the metal ring 20 with a seal lip portion 31 provided on the sealing object B side with respect to the axial direction of the rod 4. And a dust lip 32 provided on the outer A side of the metal ring 20 with respect to the axial direction of the rod 4. Moreover, the seal part 30 is provided in the lower surface 20c vicinity of the metal ring 20, and is provided with the insertion part 33 extended toward the sealing object B side from the outer peripheral part. The fitting portion 33 has a protrusion 33a extending outward in the radial direction, and the maximum radius of the protrusion 33a is larger than the radius of the outer cylinder 2b. Therefore, when the sealing device 10 is press-fitted into the outer cylinder 2b, the protrusion 33a is pressed against the inner peripheral surface of the outer cylinder 2b, and the fitting portion 33 is held in a state of being bent radially inward.

  The seal portion 30 has a check valve 34 provided in the vicinity of the lower surface 20 c of the metal ring 20. The check valve 34 is disposed approximately in the middle of the seal lip portion 31 and the fitting portion 33 in the radial direction, and extends toward the sealing target B side. The seal portion 30 is molded from an elastomer such as synthetic rubber, and is made of, for example, NBR or HNBR.

  The seal lip portion 31 includes a base portion 31a disposed near the inner side in the radial direction of the metal ring 20 and on the sealing target B side, and an extending portion 31b extending from the base portion 31a inward in the radial direction and toward the sealing target B side. Prepare. A main seal lip and a sub seal lip, which will be described later, are formed on the radially inner side of the extending portion 31b. A housing groove 31c for housing the garter spring 40 is formed on the radially outer side of the extending portion 31b (the direction toward the outer cylinder 2b). The seal lip portion 31 is formed on the radially inner side of the extending portion 31b, and is formed on the radially inner side of the base portion 31a with the main seal lip 36 protruding inward from the extending portion 31b. And a secondary seal lip 37 projecting in the direction.

  The main seal lip 36 is disposed closer to the sealing object B than the sub seal lip 37 disposed in the vicinity of the metal ring 20, and seals the sealing object 6 by sliding contact with the rod 4 reciprocating in the axial direction. The main seal lip 36 has a substantially V-shaped cross section in the radial direction, and a top portion 36 a is slidably pressed against the outer peripheral surface 4 a of the rod 4. Specifically, the main seal lip 36 is formed on the side B to be sealed from the top portion 36a that is pressed against the outer peripheral surface 4a of the rod 4, the inclined portion 36b that is formed on the outside A side from the top portion 36a. And an inclined portion 36c. The inclined portion 36b on the outer side A is formed on the opposite side of the inclined portion 36c on the sealing target B side with respect to the top portion 36a. Further, the angle formed by the inclined portion 36 b on the outer A side and the outer peripheral surface 4 a of the rod 4 is smaller than the angle formed by the inclined portion 36 c on the sealing target B side and the outer peripheral surface 4 a of the rod 4. As a result, when the rod 4 reciprocates, the sealing object 6 easily moves from the outer A side to the sealing object B side, and the main sealing lip 36 leaks from the sealing object B side to the outer A side. Is prevented.

  The sub seal lip 37 contacts the rod 4 reciprocating in the axial direction to seal the object 6 to be sealed. Similar to the main seal lip 36, the sub seal lip 37 has a substantially V-shaped cross section in the radial direction, and its top portion 37a abuts on the outer peripheral surface 4a of the rod 4 so as to be slidable. Further, the sub seal lip 37 includes a top portion 37a that contacts the outer peripheral surface 4a of the rod 4, an inclined portion 37b that is formed on the outer side A from the top portion, and an inclined portion 37c that is formed on the sealing object B side from the top portion 37a. With. The angle formed by the inclined portion 37b on the outside A side and the outer peripheral surface 4a of the rod 4 is smaller than the angle formed by the inclined portion 37c on the sealing target B side and the outer peripheral surface 4a of the rod 4. With such a configuration, leakage of the sealing object 6 from the sealing object B side to the external A side in the sub seal lip 37 is prevented.

  Further, the sub seal lip 37 is arranged on the outer A side, that is, on the metal ring 20 side than the main seal lip 36 in the axial direction of the rod 4. Accordingly, the radial rigidity of the sub seal lip 37 can be further increased. As described above, since the radial rigidity of the secondary seal lip 37 is increased, even when the rod 4 reciprocates with eccentricity, the deformation of the secondary seal lip 37 is suppressed, and the secondary seal lip 37 and the rod 4 are suppressed. Can be kept in contact with. As a result, the sealing performance of the sealed object 6 by the sub seal lip 37 can be improved.

  The dust lip 32 includes a base portion 32a disposed near the radially inner side of the metal ring 20 and on the outer side A, and an extending portion 32b extending from the base portion 32a to the inner side in the radial direction and toward the outer side A. A housing groove 32c for housing the garter spring 41 is formed in a radially outer portion of the extending portion 32b. The dust lip 32 is in sliding contact with the rod 4 that reciprocates in the axial direction to prevent foreign matter from entering from the outside A side to the sealed object B side. Further, the tip end portion 32d of the dust lip portion 32 that is in sliding contact with the rod 4 is formed in a convex curve radially inward. Therefore, since the tip end portion 32d is in pressure contact with the outer peripheral surface 4a of the rod 4 with a large contact surface, the mud water resistance and dust resistance of the dust lip portion 32 can be further improved.

  The check valve 34 extends from the vicinity of the lower surface 20c of the metal ring 20 toward the sealing object B side so as to be slightly inclined toward the rod 4 side. The check valve 34 has an inclined surface 34b on the sealing target B side of the tip 34a. The inclined surface 34 b is formed to face the inclined surface 3 b of the rod guide 3. When the sealing device 10 is fixed to the outer cylinder 2b, the check valve 34 is elastically deformed radially outward by receiving the surface pressure from the inclined surface 3b, and a restoring force is applied to the rod guide 3. Give. The check valve 34 configured as described above is located between the inclined surface 3b of the rod guide 3 when an external force is applied from the radially inner side to the radially outer side with respect to the tip end portion 34a of the check valve 34. Further, when the external force is applied from the radially outer side to the radially inner side, it is in close contact with the inclined surface 3b. Specifically, the check valve 34 passes through a gap formed between the check valve 34 and the rod guide 3 from the flow path 8 a formed by the seal device 10 and the rod guide 3, and then seals the seal device. The flow in the direction toward the flow path 8b formed by the rod guide 3 and the rod guide 3 is allowed, and the reverse flow is prevented.

  When the rod 4 reciprocates, a part of the sealing object 6 attached to the outer peripheral surface 4 a of the rod 4 is formed between the seal device 10 and the rod guide 3 through a minute gap between the rod guide 3 and the rod 4. The accumulated flow path 8, specifically, the flow path 8 a located radially inward of the check valve 34 is accumulated. When the sealing object 6 is accumulated in the flow path 8a and the pressure in the flow path 8a becomes higher than a predetermined pressure, the check valve 34 forms a gap with the inclined surface 3b of the rod guide 3. It is elastically deformed. At this time, the sealing object 6 flows from the flow path 8a through the gap to the flow path 8b positioned radially outward from the check valve 34. Then, the sealed object 6 that has flowed through the flow path 8 b is returned to the reservoir chamber 2 c through the communication path 3 a provided in the rod guide 3. On the other hand, even if the pressure in the flow path 8b increases due to the accumulation of the sealing target 6 in the flow path 8b, the sealing target 6 in the flow path 8b is connected to the inclined surface 34b of the check valve 34 and the rod guide 3. Since the surface pressure with the inclined surface 3b is urged, no gap is formed between the inclined surfaces, and the flow does not flow from the flow path 8b to the flow path 8a. Thus, by providing the flow path 8, the check valve 34, and the communication path 3a, an oil return mechanism for the sealed object 6 is configured, and the sealed object 6 is stored excessively in the flow path 8a. And good sealing performance at the seal lip portion 31 can be maintained for a long time.

  In order to configure the oil return mechanism described above, it is necessary to mount the seal device 10 on the outer cylinder 2b in the correct orientation. Therefore, the seal portion 30 of the present invention has an identified portion 35 in the vicinity of the upper surface 20b of the metal ring 20 (FIG. 2). The identified portion 35 is disposed between the dust lip portion 32 and the end face 2 b ″ of the inward flange 2 b ′ in the radial direction, and protrudes to the outside A side. The identified portion 35 includes a projection 35a as a convex portion located on the radially inner side and a projection 35b located on the radially outer side. The two protrusions 35a and 35b are preferably arranged in a substantially annular shape with the rod 4 as the center. Further, it is more preferable that the protrusions 35a and 35b are two protrusions that are arranged substantially concentrically and arranged in parallel with each other.

  The identified portion 35 is disposed closer to the dust strip portion 32 in the radial direction. In other words, the distance between the protrusion 35a and the dust strip 32 is shorter than the distance between the protrusion 35b and the end surface 2b ''. In addition, since a predetermined space can be provided between the projection 35b positioned on the radially outer side and the end surface 2b '', a company name, a product name, or the like is stamped between the projection 35b and the end surface 2b ''. Is also possible.

  Further, the seal portion 30 has a stepped portion in the vicinity of the upper surface 20b of the metal ring 20, and the protrusion 35a is provided on the high back surface 35c and the protrusion 35b is provided on the low back surface 35d. When the position of the upper surface 20b of the metal ring 20 is used as a reference, the axial height of the high back surface 35c is higher than the axial height of the low back surface 35d, and the high back surface 35c is disposed closer to the external A side than the low back surface 35d. Is done. For this reason, the protrusion 35a is disposed on the external A side with respect to the protrusion 35b. Thus, since the projections 35a and 35b have different axial heights with respect to the position of the upper surface 20b of the metal ring 20, the operator visually recognizes these projections 35a and 35b as three-dimensional. Can be recognized by touch, or tactilely by touching more parts.

  In the present embodiment, the protrusions 35a and 35b have a substantially triangular cross section and are formed to protrude toward the outside A side. Thereby, when the operator touches the apexes (annular ridge lines) of the protrusions 35a and 35b, the protrusions 35a and 35b can be easily recognized tactilely.

  As described above, according to the present embodiment, the seal portion 30 has the protrusions 35a and 35b in the vicinity of the upper surface 20b of the metal ring 20 facing the outside A side. Thereby, when assembling the sealing device 10 to the rod 4, the operator can recognize the direction of the sealing device 10 correctly and easily by recognizing the protrusions 35a and 35b. Therefore, when the sealing device 10 is assembled to the rod 4, the sealing device 10 can be attached to the rod 4 in the correct orientation, and the inherent sealing performance can be reliably exhibited. Further, it is possible to prevent erroneous assembly, and even if erroneous assembly occurs, it is possible to easily determine erroneous assembly in a subsequent process.

  The identified portion 35 is arranged in an annular shape around the rod 4. Furthermore, the identified portion 35 is preferably composed of two ridges arranged side by side in the radial direction. For this reason, when the sealing device 10 is assembled, the operator can reliably recognize the identified portion 35 visually or tactilely from any direction around the axis of the rod 4. Therefore, the workability associated with the assembly of the sealing device 10 can be improved, and the work time can be shortened.

  In particular, two garter springs 40 and 41 may be provided in a cylinder damper constituting the suspension of an automobile in order to increase the pressing force of the seal portion 30 against the rod 4. Even in such a case, according to the sealing device 10 of the present invention, the above-described effects can be reliably achieved.

  In addition, a double cylinder type cylinder damper constituting a suspension of an automobile is provided with a sealing device 10 having a check valve 34 in order to maintain its function for a long period of time. Even if it is such a structure, according to the sealing apparatus 10 of this invention, the said effect can be show | played reliably. As a result, the original function of the sealing device can be exhibited normally.

  FIG. 3 is a longitudinal sectional view showing a modification of the sealing device of FIG. 3 differs from the sealing device of FIG. 2 in the form of the identified portion 35, and the other parts are basically the same as the sealing device 10 in FIG. Will be omitted, and the differences will be described below.

  The identified portion 35 ′ in FIG. 3 is constituted by a recessed portion that is recessed toward the sealing object B side, whereas the identified portion 35 in FIG. 2 is constituted by a convex portion. A groove 35a 'as a recess is provided on the high back surface 35c of the stepped portion, and a groove 35b' is provided on the low back surface 35d. The groove 35a 'is radially inward of the groove 35b' and external A Placed on the side. The grooves 35 a ′ and 35 b ′ have, for example, a substantially triangular shape in longitudinal section, are disposed in a substantially annular shape around the rod 4, and are arranged side by side in the radial direction.

  As shown in FIG. 2 and FIG. 3, the above-described identified portion is formed by a concave portion or a convex portion, so that when the seal device 10 is assembled to the rod 4, the operator is formed in the vicinity of the upper surface 20 b of the metal ring 20. The concave portion or the convex portion can be visually or tactilely recognized, and the correct assembly direction of the sealing device 10 can be determined more accurately. In addition, the color to which the said to-be-identified part was attached | subjected with the color different from the seal | sticker part 30 may be sufficient, and the color attached | subjected to the recessed part or the convex part may be sufficient. In this case, the operator can visually recognize the concave portion or the convex portion with color, and can reliably prevent erroneous assembly when the seal device 10 is assembled to the rod 4. Moreover, you may comprise the said to-be-identified part by the combination of a recessed part and a convex part, and there exists an effect similar to the above.

  Although the sealing device according to the above embodiment has been described above, the present invention is not limited to the described embodiment, and various modifications and changes can be made based on the technical idea of the present invention.

  For example, the two identified portions 35 shown in FIG. 2 are arranged in an annular shape around the rod 4 and aligned in the radial direction, but the identified portions partially have a gap in plan view of the sealing device. It may be formed in an annular shape as a whole. Moreover, although the to-be-identified part 35 is arrange | positioned cyclically | annularly centering on the rod 4, it is not restricted to this, You may arrange | position so that only a cyclic | annular part (part of circular arc) may be formed. Also, the number of identified parts is not limited to two, and it is sufficient that at least one or more parts are provided.

  Moreover, although the protrusions 35a and 35b in FIG. 2 have a substantially triangular shape in a longitudinal sectional view, it is sufficient that the operator can recognize from the outside A side, and has other shapes such as a semicircular shape and a rectangle. May be. Similarly, the grooves 35 a ′ and 35 b ′ in FIG. 3 have a substantially triangular shape in a longitudinal sectional view, but may have other shapes such as a semicircular shape and a rectangular shape.

  Further, the sealing device 10 shown in FIG. 2 includes two garter springs 40, but only one garter spring 40 may be provided or provided depending on the required pressing force to the rod 4. It does not have to be done.

  Although the sealing device 10 shown in FIG. 2 includes the secondary seal lip 37, the secondary seal lip 37 may not be included.

  The main seal lip 36 and the sub seal lip 37 are not limited to a substantially V-shaped radial cross section, and may have other shapes as long as they have end portions that slidably contact the outer peripheral surface 4a of the rod 4. Also good.

  The sealing device of the present invention is extremely useful as a cylinder damper for vehicles, particularly as a device that can be attached to a double cylinder type cylinder damper that constitutes a suspension of an automobile.

DESCRIPTION OF SYMBOLS 1 Cylinder damper 2 Cylinder 2a Inner cylinder 2b Outer cylinder 2b 'Inward flange 2b''End surface 2c Reservoir chamber 2d Communication path 2e Upper chamber 2f Lower chamber 3 Rod guide 3a Communication path 3b Inclined surface 4 Rod 4a Outer surface 5 Piston 5a Valve Part 6 Sealed object 7 Gas 8, 8a, 8b Flow path 10 Sealing device 20 Metal ring 20a Outer peripheral part 20b Upper face 20c Lower face 30 Seal part 31 Seal lip part 31a Base part 31b Extension part 31c Housing groove 32 Dustrip part 32a Base part 32b Extension Protruding portion 32c Housing groove 32d Tip portion 33 Insertion portion 33a Protrusion 34 Check valve 34a Tip portion 34b Inclined surface 35, 35 'Identification portion 35a, 35b Protrusion 35a', 35b 'Groove 35c High back surface 35d Low back surface 36 Main dust strip 36a, 37a Tip portions 36b, 36c, 37b, 37 c Inclined part 37 Deputy dust lip 40, 41 Garter spring

Claims (10)

A sealing device comprising a metal ring and an elastomeric seal portion held by the metal ring,
The seal portion is disposed on the outer side of the seal lip with respect to the axial direction of the rod, and is sealed from the outer side in contact with the rod. With a dust lip to prevent foreign objects from entering the target side,
The seal device has at least one identified portion in the vicinity of the surface of the metal ring facing the outside.   The sealing device according to claim 1, wherein the identified portion is configured by a concave portion and / or a convex portion.   The sealing device according to claim 1, wherein the identified portion is arranged in a substantially annular shape around the rod.   The sealing device according to claim 3, wherein the identified portion includes two ridges arranged side by side in the radial direction.   The sealing device according to claim 1, wherein the identified part is a color given in a color different from that of the seal part.   The first garter spring fitted to the outer circumferential side of the seal lip in the radial direction and the second garter spring fitted to the outer circumferential side of the dust lip. The sealing device according to 1.   The sealing device according to claim 1, wherein the seal part further includes an extension part extending toward the sealing target side in the vicinity of the surface of the metal ring facing the sealing target side.   The extension portion is disposed in a flow path formed by the metal ring and a rod guide disposed on a sealing target side of the metal ring, and a check valve that allows a flow of the sealing target in one direction. The sealing device according to claim 7, wherein:   The sealing device according to claim 1, wherein the sealing device is attached to a rod of a cylinder damper for a vehicle.   The sealing device according to claim 9, wherein the sealing device is attached to a double cylinder type cylinder damper constituting a suspension of an automobile.

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