JP5532666B2 - SEALING DEVICE AND METHOD FOR MANUFACTURING SEALING DEVICE - Google Patents

Description

  The present invention relates to a sealing device.

  As a sealing device, those shown in FIGS. 5 and 6 are conventionally known. 5A and 5B are schematic cross-sectional views illustrating the configuration of a sealing device according to the prior art, where FIG. 5A shows a state after cut molding of the seal lip tip, and FIG. 5B shows a state before cut molding of the seal lip tip. Each is shown. 6A and 6B are schematic cross-sectional views showing a state in which the sealing device according to the related art is mounted, in which FIG. 6A is a mounting state without pressure load, FIG. 6B is a normal mounting state with pressure applied, c) shows the mounting state when negative pressure is generated.

  As shown in FIG. 5A, the sealing device 100 includes an annular base portion 101, an annular inner peripheral seal lip 102 that extends substantially axially from the inner peripheral side of the base portion 101, and an outer peripheral side of the base portion 101. And an annular outer peripheral seal lip 103 extending substantially in the axial direction.

  The sealing device 100 is used, for example, to seal an annular gap between the inner peripheral surface 201 of the cylinder 200 and the outer peripheral surface 301 of the piston 300 that reciprocates in the cylinder 200.

  As shown in FIG. 6A, the sealing device 100 is mounted in an annular groove 302 provided on the piston outer peripheral surface 301, and the inner peripheral seal lip 102 and the outer peripheral seal lip 103 are connected to the groove bottom surface 303 of the annular groove 302. By closely contacting the cylinder inner peripheral surface 201, the annular gap is sealed. Further, as shown in FIG. 6B, in the sealing device 100, the pressure applied from the sealing target region (O) side acts on the space between the inner peripheral seal lip 102 and the outer peripheral seal lip 103. Therefore, the adhesion of each seal lip is improved.

  The basic shape of the sealing device 100 configured as described above is generally formed by molding. However, as for the tip shape of the seal lip, if there is a parting line or burr on the seal surface, there is a concern that the sealing performance will deteriorate or contamination will occur. Many have been adopted.

  That is, as shown in FIG. 5 (b), the sealing device 100 is first molded into a shape in which excess molding portions 102 a and 103 a are provided at the tips of the inner peripheral seal lip 102 and the outer peripheral seal lip 103. Then, the final product shape of the sealing device 100 is finished by cutting the excess molding portions 102a and 103a.

  Further, regarding the cutting of the excess molding portion 102a of the inner peripheral seal lip 102, depending on the size of the space on the inner peripheral side of the excess molding portion 102a, the cutter C is removed from the inner peripheral side with respect to the excessive molding portion 102a (outer diameter). May be difficult to enter). Therefore, first, the surplus formed portion 103a is cut from the outer peripheral seal lip 103 by inserting the cutter C from the outer peripheral side toward the axial center (inner diameter direction), and then the surplus formed portion 102a is formed on the inner peripheral seal lip 102. On the other hand, a cutting method in which the cutter C is inserted and cut from the outer peripheral side toward the inner diameter direction is often employed.

  However, in the sealing device 100 configured as described above, the sticking of the seal lip when negative pressure is generated becomes a problem.

  For example, in order to enclose brake fluid or the like in the cylinder 200, the inside of the cylinder 200 may be in a negative pressure state. When the inside of the cylinder 200 is in a negative pressure state, the sealing device 100 is pulled to the sealing target region (O) side, and the outer peripheral seal lip 103 is separated from the cylinder inner peripheral surface 201. Thereby, the annular clearance between the cylinder 200 and the piston 300 is opened, and brake fluid or the like can be sealed into the cylinder 200 from the outside.

  At this time, as shown in FIG. 6C, the tips of the inner peripheral seal lip 102 and the outer peripheral seal lip 103 are brought into close contact with the side wall surface 304 of the annular groove 302 on the sealing target region (O) side, thereby A sealed space ES surrounded by the seal lip 102, the outer peripheral seal lip 103, and the side wall surface 304 may be formed. The sealed space ES is maintained in a negative pressure state even when the negative pressure state in the cylinder 200 is released, and the inner peripheral seal lip 102 and the outer peripheral seal lip 103 are stuck to the side wall surface 304. (Seal lip adsorption state). In such a state, the sealing device 100 cannot be expanded and deformed so that the outer peripheral seal lip 103 is in close contact with the cylinder inner peripheral surface 201, and cannot perform the sealing function. .

  Therefore, in recent years, a sealing device 100 ′ having a projection 104 as shown in FIG. 7 has been used from the viewpoint of positioning with respect to the annular groove in which the sealing device is mounted and suppressing the generation of suction of the seal lip when negative pressure is generated. It is becoming. 7A and 7B are schematic views for explaining the configuration of a sealing device 100 'according to the prior art, in which FIG. 7A is a schematic view of the sealing device 100' and FIG. 7B is a schematic perspective view of the sealing device 100 '. Respectively.

  The protrusion 104 extends from the base portion 101 between the inner peripheral seal lip 102 and the outer peripheral seal lip 103 in the axial direction and contacts the side surface of the annular groove. As a result, the posture of the sealing device 100 ′ is stabilized, and when the negative pressure is generated, the seal lip is prevented from being separated from the seal surface to be in the adsorbing state, and the deterioration of the sealing performance is suppressed.

  However, since the protrusion 104 protrudes in the axial direction from the inner peripheral seal lip 102 and the outer peripheral seal lip 103, the excess molding portion 102a of the inner peripheral seal lip 102 is formed on the outer peripheral side when the sealing device 100 ′ is manufactured. If the cutting tool is inserted in the inner diameter direction to cut it, the projection 104 becomes an obstacle. In other words, the sealing device 100 ′ can improve the sealing performance by providing the projection 104, for example, positioning and prevention of adsorption, but it becomes difficult to use the above-described cutting method, so that the productivity is lowered. become.

  In addition, there exists a thing described in patent documents 1-9 as a related technique.

Japanese Utility Model Publication No. 61-148747 JP 2008-111495 A Japanese Utility Model Publication No. 61-148748 Japanese Utility Model Publication No. 63-058662 JP 2005-534877 A JP 2008-105444 A Japanese Patent Publication No.59-025905 Japanese Utility Model Publication No. 61-073874 JP 2002-059821 A

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a sealing device capable of improving the sealing performance without deteriorating the manufacturability. .

In order to achieve the above object, the present invention provides:
A sealing device mounted in an annular groove provided on an outer peripheral surface of a piston that reciprocates in a cylinder,
An annular base,
An annular inner peripheral seal lip extending substantially axially from the inner peripheral side of the base part;
An annular outer peripheral seal lip extending substantially axially from the outer peripheral side of the base portion;
With
In the sealing device in which the tip portions of the inner and outer peripheral seal lips are molded by partially cutting the tip portions of the inner and outer peripheral seal lips,
It said inner circumferential Shiruri' flop extends between the inner peripheral and outer peripheral seal lip in the axial direction from the base portion, and has a protrusion integrated with the outer peripheral surface of the inner peripheral seal lip,
The tip portion of the outer peripheral Shiruri' flop is shorter is cut in the axial direction than the tip portion of the inner peripheral Shiruri' flop,
The tip portion of the inner peripheral Shiruri' flop is characterized by being obliquely cut so as to be longer on the outer peripheral side is the by circumferential side Rimojiku direction.
Also,
A sealing device attached to an annular groove provided on an inner peripheral surface of a cylinder in which a piston reciprocates,
An annular base,
An annular inner peripheral seal lip extending substantially axially from the inner peripheral side of the base part;
An annular outer peripheral seal lip extending substantially axially from the outer peripheral side of the base portion;
With
In the sealing device in which the tip portions of the inner and outer peripheral seal lips are molded by partially cutting the tip portions of the inner and outer peripheral seal lips,
The outer peripheral seal lip has a protrusion extending in the axial direction from the base portion between the inner periphery and the outer peripheral seal lip, and integrated with an inner peripheral surface of the outer peripheral seal lip,
The tip portion of the inner peripheral seal lip is cut shorter in the axial direction than the tip portion of the outer peripheral seal lip,
The distal end portion of the outer peripheral seal lip is characterized by being cut obliquely so that the inner peripheral side is longer in the axial direction than the outer peripheral side.

In order to achieve the above object, in the present invention,
A sealing device mounted in an annular groove provided on an outer peripheral surface of a piston that reciprocates in a cylinder,
An annular base,
An annular inner peripheral seal lip extending substantially axially from the inner peripheral side of the base part;
An annular outer peripheral seal lip extending substantially axially from the outer peripheral side of the base portion;
A projection that extends in the axial direction between the inner and outer peripheral seal lips from the base portion, and protrudes in the axial direction from the tips of the inner and outer peripheral seal lips;
A sealing device comprising:
The protrusion is
Provided integrally with the outer peripheral surface of the inner peripheral seal lip,
The tip portion of the outer peripheral Shiruri' flop, while being cut short in the axial direction than the tip portion of the inner peripheral Shiruri' flop, the tip portion integral part of the inner peripheral Shiruri' flop in said protrusion, tip characterized in that it is configured so as to protrude in the axial direction by being obliquely cut so as to be longer on the outer peripheral side is the by circumferential side Rimojiku direction, from the tip of the inner peripheral and outer peripheral seal lip with portions Sealing device.
Also,
A sealing device attached to an annular groove provided on an inner peripheral surface of a cylinder in which a piston reciprocates,
An annular base,
An annular inner peripheral seal lip extending substantially axially from the inner peripheral side of the base part;
An annular outer peripheral seal lip extending substantially axially from the outer peripheral side of the base portion;
A projection that extends in the axial direction between the inner and outer peripheral seal lips from the base portion, and protrudes in the axial direction from the tips of the inner and outer peripheral seal lips;
A sealing device comprising:
The protrusion is
Provided integrally with the inner peripheral surface of the outer peripheral seal lip,
The front end portion of the inner peripheral seal lip is cut shorter in the axial direction than the front end portion of the outer peripheral seal lip, and a portion integrated with the front end portion of the outer peripheral seal lip at the protrusion is the front end portion. In addition, the inner peripheral side is cut obliquely so as to be longer in the axial direction than the outer peripheral side, thereby being configured to protrude in the axial direction from the tips of the inner peripheral and outer peripheral seal lips. .

  The protrusion formed by the above-described configuration has a configuration that extends in the axial direction from the base portion between the inner periphery and the outer peripheral seal lip, and protrudes in the axial direction from the inner periphery and the outer peripheral seal lip. Therefore, the protrusions stabilize the posture of the sealing device at the mounting location, and suppress the adsorption of the seal lips when negative pressure is generated. In addition, the structure in which the tip portion of each seal lip is cut can prevent the formation of parting lines and burrs due to molding, thereby ensuring sealing performance and preventing contamination.

That is, according to the present invention, it is possible to form a protrusion for positioning of the sealing device and suppressing deterioration of the sealing performance simultaneously with cut molding of the sealing lip tip for ensuring sealing performance and preventing contamination. Alternatively, according to the present invention, in the sealing device provided with a protrusion for positioning of the sealing device and suppressing deterioration of the sealing performance, it is possible to cut the tip of the sealing lip for ensuring sealing performance and preventing contamination. be able to. Furthermore, since the protrusion is integrated with the outer peripheral surface of the inner peripheral seal lip, molding is easier than when the protrusion is molded independently from the seal lip as in the prior art. Become.

  The tip portions of the inner and outer peripheral seal lips are preferably cut by inserting a blade from the outer peripheral side toward the axial center.

  As a result, even when the inner diameter dimension is small and the space on the inner peripheral side of the inner peripheral seal lip is narrow, that is, for a sealing device with a specification that makes it difficult to insert the blade from the inner peripheral side with respect to the seal lip. The present invention can be preferably applied.

  According to the present invention, it is possible to improve the sealing performance without reducing the productivity.

FIG. 1 is a schematic cross-sectional view illustrating the configuration of a sealing device according to Embodiment 1 of the present invention. FIG. 2 is a schematic perspective view illustrating the configuration of the sealing device according to the first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view illustrating cut molding of the sealing device according to Embodiment 1 of the present invention. FIG. 4 is a schematic cross-sectional view illustrating the configuration of the sealing device according to the second embodiment of the present invention. FIG. 5 is a schematic cross-sectional view for explaining the configuration of a sealing device according to the prior art. FIG. 6 is a schematic cross-sectional view illustrating a state in which the sealing device according to the related art is mounted. FIG. 7 is a schematic diagram illustrating a configuration of a sealing device according to the related art.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

Example 1
With reference to FIGS. 1-3, the sealing apparatus which concerns on Example 1 of this invention is demonstrated. FIG. 1 is a schematic cross-sectional view illustrating the configuration of the sealing device according to the present embodiment. FIG. 2 is a schematic perspective view illustrating the configuration of the sealing device according to the present embodiment. FIG. 3 is a schematic cross-sectional view illustrating cut molding of the sealing device according to the present embodiment.

  As shown in FIG. 2, the sealing device 1 according to the present embodiment is an annular seal member, and is used for, for example, a hydraulic cylinder incorporated in a brake, a clutch, an absorber, or the like in a vehicle such as an automobile. Materials for the sealing device 1 include nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), urethane rubber (AU), fluorine rubber (FKM), acrylic rubber (ACM), chloroprene rubber (CR), ethylene propylene rubber ( EPDM) and styrene butadiene rubber (SBR).

As shown in FIG. 1, the sealing device 1 includes an annular base member 11, an annular inner peripheral seal lip 12 that extends substantially in the axial direction from the inner peripheral side of the base member 11, and a substantially axial shaft from the outer peripheral side of the base member 11. An annular outer peripheral seal lip 13 extending in the direction, and a protrusion 14 extending in the axial direction from the base member 11 between the inner peripheral seal lip 12 and the outer peripheral seal lip 13 are provided.

  The inner peripheral seal lip 12 and the outer peripheral seal lip 13 respectively extend slightly inclined from the base member 11 toward the one axial side so as to gradually widen the radial distance therebetween. As a result, the sealing device 1 has a substantially U-shaped semi-cross-sectional shape including an annular recess that is open on one axial side or recessed on the other axial side.

  The protrusion 14 is integrated with the entire outer peripheral surface of the inner peripheral seal lip 12 and is configured to protrude from the outer peripheral surface of the inner peripheral seal lip 12 in the outer diameter direction. Further, the distal end surface of the protrusion 14 and the distal end surface of the inner peripheral seal lip 12 are each formed by a tapered inclined surface such that the outer peripheral side protrudes to the one axial side relative to the inner peripheral side, and the same surface. Is forming.

  The sealing device 1 is mounted and used in the same manner as the sealing device 100 and the sealing device 100 ′ described above. That is, the sealing device 1 is mounted in an annular groove 302 provided on the piston (shaft) outer peripheral surface 301, the inner peripheral seal lip 12 is in close contact with the groove bottom surface 303 of the annular groove 302, and the outer peripheral seal lip 13 is in the cylinder inner periphery. By closely contacting the surface (shaft hole inner peripheral surface of the housing) 201, the annular gap between the cylinder 200 and the piston 300 is sealed. Further, in the sealing device 1, the projection portion 14 comes into contact with the side wall surface 304 on the sealing target region (O) side of the annular groove 302, so that the mounting posture of the base portion 11 is stabilized and is positioned with respect to the annular groove 302. It will be. Further, since the protrusion 14 is in contact with the side wall surface 304, the inner peripheral lip 12 and the outer peripheral seal lip 13 are prevented from coming into close contact with the side wall surface 304 when negative pressure is generated, and FIG. ), The sticking state of the seal lip is suppressed.

  In the sealing device 1, the direction in which the inner peripheral seal lip 12 and the outer peripheral seal lip 13 extend, that is, one side in the axial direction is a region to be sealed (O). The inner peripheral seal lip 12 and the outer peripheral seal lip 13 are each reduced in diameter so that the radial width of the annular recess is expanded by the pressure on the sealing target region (O) side when the sealing target region (O) side is at a high pressure. And the diameter expansion deformation occurs, and the adhesion to the seal surface is enhanced.

  On the other hand, when the anti-sealing target region (A) side has a high pressure, that is, when the sealing target region (O) side has a negative pressure, the entire sealing device 1 is pushed into the sealing target region (O) side, and the inner peripheral seal lip 12 In addition, the outer peripheral seal lip 13 undergoes diameter expansion and contraction deformation so that the radial width of the annular recess is reduced, and the adhesion to the seal surface is reduced. At this time, the projecting portion 14 abuts against the side wall surface of the annular groove to suppress the entire sealing device 1 from being pushed toward the sealing target region (O), and between the inner peripheral seal lip 12 and the outer peripheral seal lip 13. By interposing them, the adsorption of each seal lip is suppressed.

  The sealing device 1 configured as described above is manufactured by the molding method described in the background art, in which the basic shape is molded by molding and the tip shape of each seal lip is cut.

  That is, as shown in FIG. 3, the sealing device 1 is first molded in a shape in which excess molding portions 12 a and 13 a are provided at the tips of the inner peripheral seal lip 12 and the outer peripheral seal lip 13. In addition, the excessive shaping | molding part 14a is provided also in the projection part 14 integrated with the inner peripheral seal lip 12. FIG.

And as shown with the broken line in FIG. 3, the sealing apparatus 1 is finished by the final product shape by cutting the excess shaping | molding parts 12a and 13a. At this time, the excessive molding portion 14 a of the protrusion 14 is cut together with the excessive molding portion 12 a of the inner peripheral seal lip 12. Each excess molding part is cut by pushing the cutter C from the outer peripheral side while rotating the molded product. First, the excess molded portion 13a of the outer peripheral seal lip 13 is cut, and then the excessive molded portions 12a and 14a of the inner peripheral seal lip 12 and the protrusion 14 are cut. The distal end portions of the inner peripheral seal lip 12 and the protrusion 14 are slanted so that the outer peripheral portion of the inner peripheral seal lip 12 and the protrusion 14 is longer in the axial direction than the inner peripheral side. Is cut. Further, the front end portion of the outer peripheral seal lip 13 is cut so as to be shorter in the axial direction than the front end portion of the inner peripheral seal lip 12. In this embodiment, it is cut in the horizontal direction with respect to the axial direction. Thereby, the sealing device 1 is configured in a shape in which the protruding portion 14 protrudes in the axial direction from the tips of the inner peripheral seal lip 12 and the outer peripheral seal lip 13.

<Excellent points of this embodiment>
According to the present embodiment, it is possible to simultaneously perform the cut molding of the seal lip tip and the formation of the protrusion, and achieve both sealing performance, prevention of contamination, etc., positioning of the sealing device, and suppression of deterioration of the sealing performance. Can be realized. Alternatively, according to the present embodiment, in the sealing device provided with the protrusion, it is possible to cut the seal lip tip, and not only the positioning of the sealing device and the deterioration of the sealing performance but also the generation of parting lines and burrs are suppressed. It can also be said that it is possible to ensure sealing performance and prevent contamination.

  Moreover, since the protrusion is configured to be integrated with the outer peripheral surface of the inner peripheral seal lip, the moldability can be improved. That is, for example, as shown in FIG. 7, when the projection is molded independently of the seal lip, the space (cavity) in which the projection is molded in the molding die has a deep bag path shape. It is difficult to flow to the back and molding becomes very difficult. On the other hand, in the present embodiment, the space for forming the protruding portion and the space for forming the inner peripheral seal lip are integrated in the forming die, and the fluidity of the fabric is excellent and the forming becomes easy.

  Furthermore, according to the configuration of the present embodiment, the cutting tool is inserted into the inner peripheral seal lip and the outer peripheral seal lip from the outer peripheral side toward the shaft center, and the tips of the inner peripheral seal lip and the outer peripheral seal lip are cut-molded. Can do. Therefore, even when the inner diameter dimension is small and the space on the inner peripheral side of the inner peripheral seal lip is narrow, that is, even when the specification makes it difficult to insert the blade from the inner peripheral side with respect to the seal lip, it is easily manufactured. be able to.

  That is, according to the present embodiment, the sealing performance can be improved without reducing the manufacturability in the sealing device.

(Example 2)
With reference to FIG. 4, the sealing apparatus which concerns on Example 2 of this invention is demonstrated. FIG. 4 is a schematic cross-sectional view illustrating the configuration of the sealing device according to the present embodiment, (a) is a schematic cross-sectional view illustrating the configuration of the sealing device, and (b) is cut molding of the sealing device. It is a typical sectional view explaining about. Note that here, mainly the differences from the first embodiment will be described, and description of points common to the first embodiment, for example, materials, applications, behavior during use, and the like will be omitted.

The sealing device 1 ′ according to the present embodiment is different from the sealing device 1 according to the first embodiment that is mounted in the annular groove 302 provided in the piston (shaft) 300, and is not provided in the cylinder (housing) 200. It is configured to be mounted in the illustrated annular groove. Although not specifically shown, the sealing device 1 ′ is mounted in an annular groove provided in a cylinder inner peripheral surface (housing shaft inner peripheral surface) 201, and an inner peripheral seal lip 12 ′ is a piston (shaft). The annular clearance between the cylinder 200 and the piston 300 is sealed by closely contacting the outer peripheral surface and the outer peripheral seal lip 13 ′ closely contacting the bottom surface of the annular groove provided in the cylinder inner peripheral surface 201.

  As shown in FIG. 4 (a), in the sealing device 1 'according to the present embodiment, the protrusion 14' is provided on the outer peripheral seal lip 13 '. The protrusion 14 'is integrated with the entire inner peripheral surface of the outer peripheral seal lip 13', and is configured to protrude in the inner diameter direction from the inner peripheral surface of the outer peripheral seal lip 13 '. In addition, the tip surface of the protrusion 14 'and the tip surface of the outer peripheral seal lip 13' are each composed of a tapered inclined surface such that the inner peripheral side protrudes toward the one axial side from the outer peripheral side, forming the same surface. doing.

  As shown in FIG. 4 (b), the sealing device 1 'inserts the blade C from the outer peripheral side of the rotating molded product, and the outer peripheral seal lip 13', the protrusion 14 ', and the inner peripheral seal lip 12'. Each of the excess molding portions 13a ', 14a', 12a 'is sequentially cut to finish the final product shape. The distal end portions of the outer peripheral seal lip 13 ′ and the protruding portion 14 ′ are formed with an excess molded portion 13 a ′ and an excess molded portion so that the outer peripheral side of the outer peripheral seal lip 13 ′ and the protruding portion 14 ′ is longer in the axial direction than the inner peripheral side. 14a 'is cut diagonally. Further, the front end portion of the inner peripheral seal lip 12 'is cut so as to be shorter in the axial direction than the front end portion of the outer peripheral seal lip 13'. At this time, the cutter C is inserted obliquely with respect to the inner peripheral seal lip 12 'so as not to interfere with the outer peripheral seal lip 13' and the protrusion 14 '. Therefore, the tip end portion of the inner peripheral seal lip 12 'has a shape in which the outer peripheral side is longer in the axial direction than the inner peripheral side. As a result, the sealing device 1 ′ has a shape in which the protruding portion 14 ′ protrudes in the axial direction from the tips of the inner peripheral seal lip 12 ′ and the outer peripheral seal lip 13 ′.

  According to the above configuration, the same effect as the sealing device 1 according to the first embodiment can be obtained in the sealing device 1 ′ according to the present embodiment.

  In each of the above embodiments, the protrusion is integrated with a seal lip that is in close contact with the groove bottom surface of the annular groove. That is, the seal lip in which the protrusions are integrated is not a seal lip that is in sliding contact with the outer peripheral surface of the piston, but a seal lip that is in static contact with the groove bottom surface of the annular groove. If the protrusion is provided on the seal lip that is in sliding contact with the outer peripheral surface of the piston, the rigidity of the seal lip changes between the part where the protrusion is integrated in the seal lip and the part where it is not. This may affect the behavior of the seal lip during sliding and may cause a decrease in sealing performance. Therefore, according to the configuration of each of the above embodiments, the behavior of the seal lip that slides on the outer peripheral surface of the piston is not affected, and there is no possibility that the sealing performance is deteriorated.

  Moreover, although each said Example demonstrated as a sealing device which seals the annular clearance between a cylinder and a piston, the structure which can apply this invention is not restricted to this. That is, in order to seal the annular gap between the shaft hole provided in the housing and the shaft inserted in the shaft hole so as to be reciprocally movable, it is attached to the annular groove provided in the inner peripheral surface of the shaft hole or the outer peripheral surface of the shaft. As a sealing device to be used, it can be applied to various configurations conventionally known.

DESCRIPTION OF SYMBOLS 1 Sealing device 11 Base part 12 Inner peripheral seal lip 12a Excess molding part 13 Outer peripheral seal lip 13a Excess molding part 14 Protrusion part 14a Excess molding part

Claims (13)

A sealing device mounted in an annular groove provided on an outer peripheral surface of a piston that reciprocates in a cylinder,
An annular base,
An annular inner peripheral seal lip extending substantially axially from the inner peripheral side of the base part;
An annular outer peripheral seal lip extending substantially axially from the outer peripheral side of the base portion;
With
In the sealing device in which the tip portions of the inner and outer peripheral seal lips are molded by partially cutting the tip portions of the inner and outer peripheral seal lips,
It said inner circumferential Shiruri' flop extends between the inner peripheral and outer peripheral seal lip in the axial direction from the base portion, and has a protrusion integrated with the outer peripheral surface of the inner peripheral seal lip,
The tip portion of the outer peripheral Shiruri' flop is shorter is cut in the axial direction than the tip portion of the inner peripheral Shiruri' flop,
The tip portion of the inner peripheral Shiruri' flop sealing apparatus characterized by being obliquely cut so as to be longer on the outer peripheral side is the by circumferential side Rimojiku direction. A sealing device attached to an annular groove provided on an inner peripheral surface of a cylinder in which a piston reciprocates,
An annular base,
An annular inner peripheral seal lip extending substantially axially from the inner peripheral side of the base part;
An annular outer peripheral seal lip extending substantially axially from the outer peripheral side of the base portion;
With
In the sealing device in which the tip portions of the inner and outer peripheral seal lips are molded by partially cutting the tip portions of the inner and outer peripheral seal lips,
The outer peripheral seal lip has a protrusion extending in the axial direction from the base portion between the inner periphery and the outer peripheral seal lip, and integrated with an inner peripheral surface of the outer peripheral seal lip,
The tip portion of the inner peripheral seal lip is cut shorter in the axial direction than the tip portion of the outer peripheral seal lip,
A sealing device, wherein a tip end portion of an outer peripheral seal lip is cut obliquely so that an inner peripheral side is longer in an axial direction than an outer peripheral side. A sealing device mounted in an annular groove provided on an outer peripheral surface of a piston that reciprocates in a cylinder,
An annular base,
An annular inner peripheral seal lip extending substantially axially from the inner peripheral side of the base part;
An annular outer peripheral seal lip extending substantially axially from the outer peripheral side of the base portion;
A projection that extends in the axial direction between the inner and outer peripheral seal lips from the base portion, and protrudes in the axial direction from the tips of the inner and outer peripheral seal lips;
A sealing device comprising:
The protrusion is
Provided integrally with the outer peripheral surface of the inner peripheral seal lip,
The tip portion of the outer peripheral Shiruri' flop, while being cut short in the axial direction than the tip portion of the inner peripheral Shiruri' flop, the tip portion integral part of the inner peripheral Shiruri' flop in said protrusion, tip characterized in that it is configured so as to protrude in the axial direction by being obliquely cut so as to be longer on the outer peripheral side is the by circumferential side Rimojiku direction, from the tip of the inner peripheral and outer peripheral seal lip with portions Sealing device. A sealing device attached to an annular groove provided on an inner peripheral surface of a cylinder in which a piston reciprocates,
An annular base,
An annular inner peripheral seal lip extending substantially axially from the inner peripheral side of the base part;
An annular outer peripheral seal lip extending substantially axially from the outer peripheral side of the base portion;
A projection that extends in the axial direction between the inner and outer peripheral seal lips from the base portion, and protrudes in the axial direction from the tips of the inner and outer peripheral seal lips;
A sealing device comprising:
The protrusion is
Provided integrally with the inner peripheral surface of the outer peripheral seal lip,
The front end portion of the inner peripheral seal lip is cut shorter in the axial direction than the front end portion of the outer peripheral seal lip, and a portion integrated with the front end portion of the outer peripheral seal lip at the protrusion is the front end portion. In addition, the inner peripheral side is cut obliquely so as to be longer in the axial direction than the outer peripheral side, thereby being configured to protrude in the axial direction from the tips of the inner peripheral and outer peripheral seal lips. Sealing device. The sealing device according to any one of claims 1 to 4, wherein the tip portions of the inner and outer peripheral seal lips are cut by inserting a blade from the outer peripheral side toward the axial center. A sealing device mounted in an annular groove provided on an outer peripheral surface of a piston that reciprocates in a cylinder,
An annular base,
An annular inner peripheral seal lip extending substantially axially from the inner peripheral side of the base part;
An annular outer peripheral seal lip extending substantially axially from the outer peripheral side of the base portion;
With
In the manufacturing method of the sealing device in which the tip portions of the inner and outer peripheral seal lips are molded by partially cutting the tip portions of the inner and outer peripheral seal lips,
The inner and outer peripheral seal lips, the protrusions in the shape of a sealing device in which a protrusion extending in the axial direction between the inner and outer peripheral seal lips from the base portion is integrated with the outer peripheral surface of the inner peripheral seal lip. A first step of forming a shape other than the tip shape of each part by molding,
The tip shape of the inner and outer seal lips and the protrusion is set to each tip portion.
A second step of molding by cutting a surplus molding part from each tip part by inserting a blade from the outer peripheral side toward the axis center, and the tip part of the inner peripheral seal lip and the projection part. A second step of cutting so that the tip of the projection protrudes in the axial direction from the tips of the inner and outer peripheral seal lips;
The manufacturing method of the sealing device characterized by having. 7. The sealing according to claim 6, wherein in the second step, the inner peripheral seal lip and the tip of the protrusion are cut obliquely so that the outer peripheral side is longer in the axial direction than the inner peripheral side. Device manufacturing method. 8. The method for manufacturing a sealing device according to claim 6, wherein, in the second step, a front end portion of the outer peripheral seal lip is cut shorter in an axial direction than a front end portion of the inner peripheral seal lip. 9. The sealing device according to claim 6, wherein, in the second step, the excessive molding portion of the inner peripheral seal lip and the excessive molding portion of the protrusion are cut together. Production method. A sealing device attached to an annular groove provided on an inner peripheral surface of a cylinder in which a piston reciprocates,
An annular base,
An annular inner peripheral seal lip extending substantially axially from the inner peripheral side of the base part;
An annular outer peripheral seal lip extending substantially axially from the outer peripheral side of the base portion;
With
In the manufacturing method of the sealing device in which the tip portions of the inner and outer peripheral seal lips are molded by partially cutting the tip portions of the inner and outer peripheral seal lips,
The projections extending in the axial direction between the inner circumference and the outer circumference seal lip from the base portion in the shape of a sealing device integrated with the inner circumference surface of the outer circumference seal lip, the inner circumference and the outer circumference seal lip, the projection A first step of forming a shape other than the tip shape of each part by molding,
The inner and outer peripheral seal lips, the tip shape of the protrusion, by inserting a blade from the outer peripheral side toward the shaft center with respect to the respective tip portions, by cutting the excess molding portion from each tip portion, A second step of molding, wherein the outer peripheral seal lip and the tip of the protrusion are cut so that the tip of the protrusion protrudes more axially than the tips of the inner and outer seal lips; Process,
The manufacturing method of the sealing device characterized by having. 11. The sealing device according to claim 10, wherein in the second step, the outer peripheral seal lip and the tip end portion of the protrusion are cut obliquely so that the outer peripheral side is longer in the axial direction than the inner peripheral side. Manufacturing method. The manufacturing method of the sealing device according to claim 10 or 11, wherein, in the second step, a tip portion of the inner peripheral seal lip is cut shorter in an axial direction than a tip portion of the outer peripheral seal lip. The said 2nd process WHEREIN: The excess shaping | molding part of the said outer periphery seal lip and the excess shaping | molding part of the said projection part are cut together, The manufacturing of the sealing device of any one of Claims 10-12 characterized by the above-mentioned. Method.

Images