JP2017096304A - Seal for vane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal for a vane which can reduce slide resistance without lowering seal performance, in the seal for the vane attached to the vane which is rotationally operated in a housing, and slidably and closely adhering to an inner face of the housing.SOLUTION: A seal for a vane has a seal main body 11 composed of a rubber elastic body, and a slide member 21 composed of resin which is harder than the rubber elastic body, and is lower in friction than the rubber elastic body. A seal face of the seal for the vane is formed by combining the rubber elastic body and the resin. The rubber elastic body and the resin forming the seal face are aligned in a longitudinal direction of the seal face.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vane seal that is mounted on a vane that rotates in a housing and seals between the housing and the vane by slidably contacting an inner surface of the housing. The vane seal of the present invention is used for, for example, a rotary actuator for automobiles or a general-purpose rotary actuator for general-purpose machines.

  Conventionally, a rotary actuator 51 shown in FIG. 25 is known. In this rotary actuator 51, an inner peripheral space of a housing 52 is circumferentially provided with a plurality of pressure chambers (not shown) by a vane 54 that rotates together with a shaft 53. ). A vane seal 55 is attached to the vane 54, and the vane seal 55 slides on the inner surface of the housing 52 to seal between the housing 52 and the vane 54.

  However, in this prior art, since the vane seal 55 is formed only by the rubber-like elastic body 56, there is a problem that the sliding resistance is large and the torque loss is large even under oil lubrication. Further, when a high pressure is applied, the rubber-like elastic body 56 may cause a protrusion phenomenon. In this case, there is a problem that the seal is deformed and excessive wear occurs due to the protrusion.

  As a countermeasure to the above problem, as shown in FIG. 26, it is conceivable that the sealing surface of the vane seal 55 is formed of a resin 57 that is harder than the rubber-like elastic body 56 and has a low friction. The dynamic resistance can be reduced and the protrusion phenomenon can be suppressed.

  However, since the resin 57 has a higher elastic modulus than the rubber-like elastic body 56, gaps are likely to occur particularly at the corners of the vane due to insufficient followability to the inner surface of the housing, and the sealing performance is greatly reduced.

JP 2005-264993 A Japanese Patent No. 3696684

  In view of the above, an object of the present invention is to provide a vane seal capable of reducing sliding resistance without reducing sealing performance.

  To achieve the above object, a vane seal according to claim 1 of the present invention is a rubber-like elastic body in a vane seal that is mounted on a vane that rotates in a housing and is slidably in close contact with the inner surface of the housing. And a sliding member made of a resin that is harder and less frictional than the rubber-like elastic body, and the sealing surface of the vane seal is formed by a combination of the rubber-like elastic body and the resin The rubber-like elastic body forming the seal surface and the resin are arranged side by side in the longitudinal direction of the seal surface.

  The vane seal according to claim 2 of the present invention is the vane seal according to claim 1, further including a radial seal portion disposed at a radially outer end of the vane, wherein the diameter A seal surface of the direction seal portion is formed by a combination of the rubber-like elastic body and the resin, and the rubber-like elastic body and the resin are arranged side by side in the longitudinal direction of the seal surface. .

  A vane seal according to a third aspect of the present invention is the vane seal according to the second aspect, further comprising an axial seal portion disposed at an axial end portion of the vane, wherein the axial seal portion. The sealing surface is formed by a combination of the rubber-like elastic body and the resin, and the rubber-like elastic body and the resin are arranged side by side in the longitudinal direction of the sealing surface.

  Furthermore, the vane seal according to claim 4 of the present invention is the vane seal according to claim 3, wherein the corner portion where the radial seal portion and the axial seal portion intersect is the resin or the It is formed by any one of rubber-like elastic bodies.

  In the present invention having the above-described configuration, the vane seal includes a seal body made of a rubber-like elastic body, and a sliding member made of a resin that is harder and less frictional than the rubber-like elastic body. Since the seal surface is formed by a combination of a rubber-like elastic body and a resin, and the rubber-like elastic body and the resin that form the seal surface of the vane seal are arranged side by side in the longitudinal direction of the seal surface, the rubber-like elasticity It is possible to reduce the gap between the vane seal and the inner surface of the housing by utilizing the repulsive force of the body. The repulsive force of the rubber-like elastic body is used as follows.

  That is, when the rubber-like elastic body is disposed at the longitudinal center portion of the seal surface of the vane seal and the resin is disposed at both longitudinal ends of the seal surface, the rubber-like elastic body is resinated by the repulsive force. Press toward the inside of the housing. The same applies when a resin is disposed between the rubber-like elastic body and the inner surface of the housing. On the other hand, when the resin is disposed at the center in the longitudinal direction of the seal surface of the vane seal and the rubber-like elastic body is disposed at both longitudinal ends of the seal surface, the rubber-like elastic body has its repulsive force. To push itself toward the inside of the housing. In this case, since the rubber-like elastic body is lined with resin, the direction of the pressing force is limited to the direction toward the inner surface of the housing. The same applies when a rubber-like elastic body is disposed between the resin and the inner surface of the housing. Therefore, in any of the above cases, the gap between the vane seal and the inner surface of the housing is reduced by the repulsive force of the rubber-like elastic body. Compared to the above, it is possible to improve the sealing performance. The repulsive force of the rubber-like elastic body is generated when the rubber-like elastic body is compressed when the seal is attached, so that the length of the seal is set larger than the length of the seal attachment portion.

  Further, in the present invention having the above configuration, since a part of the sealing surface of the vane seal is formed of a hard and low-friction resin, the sealing surface of the above-described vane seal is made of only a rubber-like elastic body. It is possible to reduce the sliding resistance as compared with the above.

  In order to seal between the vane that rotates in the housing and the inner surface of the housing, it is necessary to seal between the radially outer end of the vane and the inner surface of the housing that faces the vane. The seal will have a radial seal located at the radially outward end of the vane. In this case, the seal surface of the radial seal portion is formed by a combination of a rubber-like elastic body and a resin, and the rubber-like elastic body and the resin are arranged side by side in the longitudinal direction of the seal surface. An axial repulsive force is generated in the vane. Therefore, the axial clearance between the vane seal and the inner surface of the housing can be reduced.

  In addition, in order to seal between the vane that rotates in the housing and the inner surface of the housing, it is necessary to seal between the axial end of the vane and the inner surface of the housing that faces the vane. Will have an axial seal located at the axial end of the vane. In this case, the seal surface of the axial seal portion is formed by a combination of a rubber-like elastic body and a resin, and the rubber-like elastic body and the resin are arranged side by side in the longitudinal direction of the seal surface. A radial repulsive force is generated in the vane. Therefore, the radial gap between the vane seal and the inner surface of the housing can be reduced.

  When the vane seal has both a radial seal portion and an axial seal portion, a corner portion where both seal portions intersect is set. In the present invention, this corner portion is made of a resin or rubber-like elastic body. It will be formed by either one.

  The present invention has the following effects.

  That is, in the present invention, as described above, the gap between the vane seal and the inner surface of the housing is reduced by the repulsive force of the rubber-like elastic body, so that the sealing performance can be improved and the vane can be improved. Since a part of the sealing surface of the seal for use is made of a hard and low friction resin, the sliding resistance can be reduced. Therefore, according to the intended purpose of the present invention, it is possible to provide a vane seal capable of reducing sliding resistance without reducing sealing performance.

It is a figure which shows the seal | sticker for vanes which concerns on 1st Example of this invention, (A) is the perspective view, (B) is a top view, (C) is a front view. It is a figure which shows the seal body in the same seal for vanes, (A) is the perspective view, (B) is a top view, (C) is a front view It is a figure which shows the sliding member in the seal | sticker for the same vane, (A) is the perspective view, (B) is a top view, (C) is a front view (A) is explanatory drawing which shows the mounting structure of the same vane seal, (B) is sectional drawing which shows the mounting state of the same vane seal It is a figure which shows the seal | sticker for vanes which concerns on 2nd Example of this invention, (A) is the perspective view, (B) is a top view, (C) is a front view. It is a figure which shows the seal body in the same seal for vanes, (A) is the perspective view, (B) is a top view, (C) is a front view It is a figure which shows the sliding member in the seal | sticker for the same vane, (A) is a perspective view of a radial direction sliding member, (B) is a perspective view of an axial direction sliding member (A) is explanatory drawing which shows the mounting structure of the same vane seal, (B) is sectional drawing which shows the mounting state of the same vane seal It is a figure which shows the seal | sticker for vanes concerning 3rd Example of this invention, (A) is the perspective view, (B) is a top view, (C) is a front view. It is a figure which shows the seal body in the same seal for vanes, (A) is the perspective view, (B) is a top view, (C) is a front view It is a figure which shows the sliding member in the seal | sticker for the same vane, (A) is the perspective view, (B) is a top view, (C) is a front view (A) is explanatory drawing which shows the mounting structure of the same vane seal, (B) is sectional drawing which shows the mounting state of the same vane seal It is a figure which shows the seal | sticker for vanes concerning 4th Example of this invention, (A) is the perspective view, (B) is a top view, (C) is a front view. It is a figure which shows the seal body in the same seal for vanes, (A) is the perspective view, (B) is a top view, (C) is a front view Perspective view of sliding member in the same vane seal (A) is explanatory drawing which shows the mounting structure of the same vane seal, (B) is sectional drawing which shows the mounting state of the same vane seal It is a figure which shows the seal | sticker for vanes concerning 5th Example of this invention, (A) is the perspective view, (B) is a top view, (C) is a front view. It is a figure which shows the seal body in the same seal for vanes, (A) is the perspective view, (B) is a top view, (C) is a front view It is a figure which shows the sliding member in the seal | sticker for the same vane, (A) is the perspective view, (B) is a top view, (C) is a front view (A) is explanatory drawing which shows the mounting structure of the same vane seal, (B) is sectional drawing which shows the mounting state of the same vane seal It is a figure which shows the seal | sticker for vanes which concerns on 6th Example of this invention, (A) is the perspective view, (B) is a top view, (C) is a front view. It is a figure which shows the seal body in the same seal for vanes, (A) is the perspective view, (B) is a top view, (C) is a front view It is a figure which shows the sliding member in the seal | sticker for the same vane, (A) is a perspective view of a radial direction sliding member, (B) is a perspective view of an axial direction sliding member (A) is explanatory drawing which shows the mounting structure of the same vane seal, (B) is sectional drawing which shows the mounting state of the same vane seal (A) is a sectional view of a rotary actuator equipped with a vane seal according to a conventional example, (B) is a perspective view of the vane seal (A) is a perspective view of a seal for a vane according to another conventional example, (B) is a cross-sectional view showing a mounting state of the seal for the vane

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment
FIG. 1 shows a vane seal 1 according to a first embodiment of the present invention. FIG. 2 shows a single seal body 11 made of a rubber-like elastic body, which is a component of the vane seal 1. FIG. 3 shows a single sliding member 21 made of resin, which is a component of the vane seal 1, and two sliding members 21 are used in this embodiment. 4A shows a mounting structure in which the vane seal 1 is mounted on the vane 33, and FIG. 4B shows the mounting state in section.

  As shown in FIGS. 4A and 4B, the vane seal 1 is attached to a vane 33 that rotates together with a shaft 32 in the housing 31 of the rotary actuator, and is slidably in close contact with the inner surface of the housing 31. By this, the space between the housing 31 and the vane 33 is sealed. The inner surface of the housing 31 is composed of a cylindrical inner peripheral surface 31a and axial end walls 31b having a plane perpendicular to the axis provided on both sides in the axial direction.

  As shown in FIG. 1, the vane seal 1 includes a seal body 11 made of a rubber-like elastic body and a sliding member 21 made of a resin that is harder and has a lower friction than the rubber-like elastic body. The seal surfaces 2A and 3A of the vane seal 1 are formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the sliding member 21, and the rubber-like elasticity of the seal body 11 forming the seal surfaces 2A and 3A. The body and the resin of the sliding member 21 are arranged side by side in the longitudinal direction of the seal surfaces 2A and 3A.

  Further, the vane seal 1 has a radial seal portion 2 disposed at a radially outward end of the vane 33. As described above, the seal surface 2A of the radial seal portion 2 is formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the sliding member 21, and the rubber-like elastic body of the seal body 11 and the sliding member 21 are formed. These resins are arranged side by side in the longitudinal direction of the seal surface 2A.

  In addition, the vane seal 1 includes axial seal portions 3 that are respectively disposed at axial end portions of the vane 33. As described above, the seal surface 3A of the axial seal portion 3 is formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the sliding member 21, and the rubber-like elastic body of the seal body 11 and the sliding member 21 are formed. These resins are arranged side by side in the longitudinal direction of the seal surface 3A.

  Since the radial seal portion 2 is disposed at the radially outer end of the vane 33 and seals between the cylindrical inner peripheral surface 31 a of the housing 31, the vane 33 has a rectangular bar shape with a long cross section in the axial direction. It is formed as a seal part. Each of the axial seal portions 3 is disposed at an axial end portion of the vane 33 and seals between the axial end walls 31b of the housing 31, so that the vane 33 is formed as a rod-shaped seal portion having a square section that is long in the radial direction. Has been. Therefore, since the axial seal portion 3 is integrally formed from both longitudinal ends of the radial seal portion 2 extending in the axial direction toward the radially inward direction of the vane 33, the vane seal 1 is generally U-shaped. It is formed in a shape. The vane seal 1 has corner portions where the radial seal portion 2 and the axial seal portion 3 intersect at both axial ends. Each corner is formed of resin of the sliding member 21.

  As shown in FIG. 2, the seal body 11 made of a rubber-like elastic body has a rod-shaped first base portion 12 having a square cross section forming a part of the radial seal portion 2, and both longitudinal ends of the first base portion 12. A rod-shaped second base portion 13 having a square cross section forming a part of the axial seal portion 3 is integrally formed in a perpendicular direction and in the same direction.

  In order to form a part of the seal surface 2A of the radial seal part 2 on the outer surface 12a of the first base part 12 forming a part of the radial seal part 2, the convex parts 14 and 15 are in the longitudinal center of the first base part 12. It is located in the part. The convex portions 14, 15 are a combination of a rectangular parallelepiped first convex portion 14 and a rectangular parallelepiped second convex portion 15, and both convex portions 14, 15 are mutually in the longitudinal direction of the first base portion 12. The first base portion 12 is provided so as to be displaced and also displaced in the width direction of the first base portion 12. One side surface 14 a of the rising direction of the first convex portion 14 is an abutting surface with respect to one sliding member 21, and the one side surface 14 b on the opposite side is an abutting surface with respect to the other sliding member 21. The leading end surface of the first convex portion 14 in the rising direction is a part of the seal surface 2A. One side surface 15 a in the rising direction of the second convex portion 15 is an abutting surface against one sliding member 21, and the other side surface 15 b is an abutting surface against the other sliding member 21. The leading end surface of the second protrusion 15 in the rising direction is a part of the seal surface 2A.

  Further, in order to form a part of the seal surface 3A of the axial seal portion 3 on the outer surface 13a of the second base portion 13 that forms a part of the axial seal portion 3, the third convex portion 16 is formed on the second base portion 13. It is located at the longitudinal tip. One side surface of the rising direction of the third convex portion 16 is an abutting portion with respect to the sliding member 21, and this abutting portion is a two-surface provided at a position displaced in the longitudinal direction in the width direction of the second base portion 13. It is formed by the abutting surfaces 16a and 16b. The leading end surface of the third protrusion 16 in the rising direction is a part of the seal surface 3A.

  The seal main body 11 made of this rubber-like elastic body is manufactured as a part having a line-symmetric shape as a whole.

  Two sliding members 21 made of resin are used as described above. Since the two sliding members 21 have the same shape, only one of them will be described.

  That is, as shown in FIG. 3, the sliding member 21 made of resin has a plate-like first seal surface portion 22 that forms a part of the seal surface 2 </ b> A of the radial seal portion 2, and the first seal surface portion 22. A plate-like second seal surface portion 23 forming a part of the seal surface 3A of the axial direction seal portion 3 is integrally formed from one end portion in the longitudinal direction toward the right-angle direction.

  The front end portion of the first seal surface portion 22 is an abutting portion for the first and second convex portions 14 and 15, and this abutting portion is provided at a position displaced in the longitudinal direction in the width direction of the first seal surface portion 22. The two abutting surfaces 22a and 22b are formed. One abutting surface 22 a is abutted against the abutting surface 14 a of the first convex portion 14 (or the abutting surface 15 b of the second convex portion 15), and the other abutting surface 22 b is abutted against the second convex portion 15. It abuts on the surface 15a (or the abutment surface 14b of the first convex portion 14). The thickness of the first seal surface portion 22 is equal to the height of the first and second convex portions 14 and 15.

  The front end portion of the second seal surface portion 23 is an abutting portion with respect to the third convex portion 16, and the abutting portion is a two-surface provided at a position displaced in the longitudinal direction in the width direction of the second seal surface portion 23. It is formed by the abutting surfaces 23a and 23b. One abutting surface 23 a is abutted against one abutting surface 16 a of the third convex portion 16, and the other abutting surface 23 b is abutted against the other abutting surface 16 b of the third convex portion 16. The thickness of the second seal surface portion 23 is equal to the height of the third convex portion 16.

  The vane seal 1 shown in FIG. 1 is manufactured by assembling and joining the seal body 11 shown in FIG. 2 and the sliding member 21 shown in FIG. As shown in FIG. 4A, the vane seal 1 is mounted in a U-shaped mounting groove 34 provided at the radially outer end and the axial end of the vane 33, as shown in FIG. ) And the vane 33 and the like are assembled in the housing 31. At this time, the seal 1 is mounted in a state compressed in the radial direction and the axial direction of the vane 33, thereby generating a repulsive force on the rubber-like elastic body of the seal body 11 as follows.

  That is, as shown by the arrows in FIGS. 1B and 1C, in the seal surface 2A of the radial seal portion 2, the first and second convex portions 14 of the seal body 11 are arranged at the center in the longitudinal direction of the seal surface 2A. , 15 and the first seal surface portion 22 of the sliding member 21 are disposed at both ends in the longitudinal direction of the seal surface 2A, respectively, so that the first and second convex portions 14, 15 of the seal body 11 are The rubber-like elastic body is compressed in the longitudinal direction of the seal surface 2A, and the repulsive force presses the resin of the first seal surface portion 22 of the sliding member 21 in the axial direction, that is, toward the axial end wall 31b of the housing 31 (arrow) D). Accordingly, the axial gap between the seal 1 and the axial end wall 31b of the housing 31 is reduced. Similarly, in the radial seal portion 2, the rubber-like elastic body of the first base portion 12 of the seal body 11 is compressed in the height direction, and the resin of the first seal surface portion 22 of the sliding member 21 is repelled by the repulsive force. It is pressed radially outward, that is, toward the cylindrical inner peripheral surface 31a of the housing 31 (arrow E). Therefore, the radial gap between the seal 1 and the cylindrical inner peripheral surface 31a of the housing 31 is reduced.

  On the seal surface 3A of the axial seal portion 3, the rubber-like elastic body of the third convex portion 16 of the seal body 11 is compressed in the longitudinal direction of the seal surface 3A, and the second seal of the sliding member 21 is generated by the repulsive force. The resin of the surface portion 23 is pressed radially outward, that is, toward the cylindrical inner peripheral surface 31a of the housing 31 (arrow F). Therefore, the radial gap between the seal 1 and the cylindrical inner peripheral surface 31a of the housing 31 is reduced. Similarly, in the axial seal portion 3, the rubber-like elastic body of the second base portion 13 of the seal body 11 is compressed in the height direction, and the repulsive force causes the resin of the second seal surface portion 23 of the sliding member 21 to shaft. Direction (ie, arrow G) toward the axial end wall 31b of the housing 31. Accordingly, the axial gap between the seal 1 and the axial end wall 31b of the housing 31 is reduced.

  Therefore, since the gap between the seal 1 and the housing 31 is reduced by these pressing forces, excellent sealing performance is exhibited.

  Further, since part of the seal surfaces 2A and 3A of the seal 1 is made of a hard and low friction resin, the sliding resistance is reduced.

Second embodiment ...
FIG. 5 shows a vane seal 1 according to a second embodiment of the present invention. FIG. 6 shows a single seal body 11 made of a rubber-like elastic body, which is a component of the vane seal 1. FIG. 7A shows a single radial sliding member 24 made of resin, which is a component of the vane seal 1. FIG. 7B shows a single axial sliding member 25 made of resin, which is a component of the vane seal 1, and two axial sliding members 25 are used in this embodiment. FIG. 8A shows a mounting structure for mounting the vane seal 1 on the vane 33, and FIG. 8B shows the mounting state in cross section.

  As shown in FIGS. 8A and 8B, the vane seal 1 is attached to a vane 33 that rotates with the shaft 32 in the housing 31 of the rotary actuator, and is slidably in close contact with the inner surface of the housing 31. By this, the space between the housing 31 and the vane 33 is sealed. The inner surface of the housing 31 is composed of a cylindrical inner peripheral surface 31a and axial end walls 31b having a plane perpendicular to the axis provided on both sides in the axial direction.

  As shown in FIG. 5, the vane seal 1 includes a seal body 11 made of a rubber-like elastic body, a radial sliding member 24 made of a resin harder and lower in friction than the rubber-like elastic body, and an axial slide. Member 25. The sealing surfaces 2A and 3A of the vane seal 1 are formed by combining the rubber-like elastic body of the seal body 11 and the resin of the radial sliding member 24 or the rubber-like elastic body of the seal body 11 and the axial sliding member 25. The rubber-like elastic body of the seal body 11 that forms the seal surfaces 2A and 3A and the resin of the sliding members 24 and 25 are arranged side by side in the longitudinal direction of the seal surfaces 2A and 3A. .

  Further, the vane seal 1 has a radial seal portion 2 disposed at a radially outward end of the vane 33. As described above, the seal surface 2A of the radial seal portion 2 is formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the radial sliding member 24, and the rubber-like elastic body of the seal body 11 and the radial direction. The resin of the sliding member 24 is arranged side by side in the longitudinal direction of the seal surface 2A.

  In addition, the vane seal 1 includes axial seal portions 3 that are respectively disposed at axial end portions of the vane 33. As described above, the seal surface 3A of the axial seal portion 3 is formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the axial sliding member 25, and the rubber-like elastic body of the seal body 11 and the axial direction. The resin of the sliding member 25 is arranged side by side in the longitudinal direction of the seal surface 3A.

  Since the radial seal portion 2 is disposed at the radially outer end of the vane 33 and seals between the cylindrical inner peripheral surface 31 a of the housing 31, the vane 33 has a rectangular bar shape with a long cross section in the axial direction. It is formed as a seal part. Each of the axial seal portions 3 is disposed at an axial end portion of the vane 33 and seals between the axial end walls 31b of the housing 31, so that the vane 33 is formed as a rod-shaped seal portion having a square section that is long in the radial direction. Has been. Therefore, since the axial seal portion 3 is integrally formed from both longitudinal ends of the radial seal portion 2 extending in the axial direction toward the radially inward direction of the vane 33, the vane seal 1 is generally U-shaped. It is formed in a shape. The vane seal 1 has corner portions where the radial seal portion 2 and the axial seal portion 3 intersect at both axial ends. Each corner is formed by a rubber-like elastic body of the seal body 11.

  As shown in FIG. 6, the seal main body 11 made of a rubber-like elastic body has a rod-shaped first base portion 12 having a square cross section forming a part of the radial seal portion 2, and both longitudinal ends of the first base portion 12. A rod-shaped second base portion 13 having a square cross section forming a part of the axial seal portion 3 is integrally formed in a perpendicular direction and in the same direction.

  In order to form a part of the seal surface 2A of the radial seal part 2 on the outer surface 12a of the first base part 12 forming a part of the radial seal part 2, the first convex part 17 has both longitudinal ends of the first base part 12. In order to form a part of the seal surface 3A of the axial seal part 3 on the outer surface 13a of the second base part 13 which is provided at each of the parts and formed as a part of the axial seal part 3, The portion 18 is provided at the longitudinal base end of the second base portion 13, and the first and second convex portions 17 and 18 are provided as a front L-shaped convex portion integrated with each other.

  One side surface of the first convex portion 17 in the rising direction is an abutting portion with respect to the radial sliding member 24, and this abutting portion is provided at a position displaced in the longitudinal direction in the width direction of the first base portion 12. It is formed by the abutting surfaces 17a and 17b. The leading end surface of the first convex portion 17 in the rising direction is a part of the seal surface 2A. One side surface of the second convex portion 18 in the rising direction is an abutting portion with respect to the axial sliding member 25, and the abutting portion is provided at a position displaced in the longitudinal direction in the width direction of the second base portion 13. It is formed by the abutting surfaces 18a and 18b. The leading end surface of the second protrusion 18 in the rising direction is a part of the seal surface 3A.

  The seal main body 11 made of this rubber-like elastic body is manufactured as a part having a line-symmetric shape as a whole.

  As described above, the sliding members 24 and 25 made of resin include one radial sliding member 24 that forms part of the radial seal portion 2 and an axial sliding member that forms part of the axial seal portion 3. Two 25 are used.

  Of these, first, the radial sliding member 24 is made of a plate-like member that forms a part of the seal surface 2A of the radial seal portion 2 as shown in FIG. Both ends in the longitudinal direction of the radial sliding member 24 are abutting portions with respect to the first convex portion 17, and the abutting portions are provided at positions displaced in the longitudinal direction in the width direction of the radial sliding member 24. The two abutting surfaces 24a and 24b are formed. One abutting surface 24 a is abutted against one abutting surface 17 a of the first convex portion 17, and the other abutting surface 24 b is abutted against the other abutting surface 17 b of the first convex portion 17. The thickness of the radial sliding member 24 is equal to the height of the first convex portion 17.

  On the other hand, two axial sliding members 25 are used as described above. Since the two axial sliding members 25 have the same shape, only one of them will be described.

  That is, each of the axial sliding members 25 is formed of a plate-like member that forms a part of the seal surface 3A of the axial seal portion 3 as shown in FIG. One end portion in the longitudinal direction of the axial sliding member 25 is an abutting portion against the second convex portion 18, and this abutting portion is provided at a position displaced in the longitudinal direction in the width direction of the axial sliding member 25. It is formed by two abutting surfaces 25a and 25b. One abutting surface 25 a is abutted against one abutting surface 18 a of the second convex portion 18, and the other abutting surface 25 b is abutted against the other abutting surface 18 b of the second convex portion 18. The thickness of the axial sliding member 25 is equal to the height of the second convex portion 18.

  The vane seal 1 of FIG. 5 is assembled by assembling and joining the seal body 11 of FIG. 6, the radial sliding member 24 of FIG. 7A, and the axial sliding member 25 of FIG. 7B. Produced. As shown in FIG. 8A, the vane seal 1 is mounted in a U-shaped mounting groove 34 provided at the radially outer end and the axial end of the vane 33. ) And the vane 33 and the like are assembled in the housing 31. At this time, the seal 1 is mounted in a state compressed in the radial direction and the axial direction of the vane 33, thereby generating a repulsive force on the rubber-like elastic body of the seal body 11 as follows.

  That is, as indicated by arrows in FIGS. 5B and 5C, in the seal surface 2A of the radial seal portion 2, the radial sliding member 24 is disposed at the center in the longitudinal direction of the seal surface 2A and the seal. Since the first convex portions 17 of the seal body 11 are arranged at both longitudinal ends of the surface 2A, the rubber-like elastic bodies of the first convex portions 17 of the seal body 11 are compressed in the longitudinal direction of the seal surface 2A, respectively. Then, the repulsive force presses itself toward the axial direction, that is, the axial end wall 31b of the housing 31 (arrow H). Accordingly, the axial gap between the seal 1 and the axial end wall 31b of the housing 31 is reduced. Similarly, in the radial seal portion 2, the rubber-like elastic body of the first base portion 12 of the seal body 11 is compressed in the height direction, and the repulsive force causes the resin of the radial slide member 24 to be radially outward, that is, Press toward the cylindrical inner peripheral surface 31a of the housing 31 (arrow I). Therefore, the radial gap between the seal 1 and the cylindrical inner peripheral surface 31a of the housing 31 is reduced.

  On the seal surface 3A of the axial seal portion 3, the rubber-like elastic body of the second convex portion 18 of the seal body 11 is compressed in the longitudinal direction of the seal surface 3A, and the repulsive force makes itself radially outward, that is, the housing. It presses toward the cylindrical internal peripheral surface 31a of 31 (arrow J). Therefore, the radial gap between the seal 1 and the cylindrical inner peripheral surface 31a of the housing 31 is reduced. Similarly, in the axial seal portion 3, the rubber-like elastic body of the second base portion 13 of the seal body 11 is compressed in the height direction, and the repulsive force causes the resin of the axial slide member 25 to be axially, that is, the housing 31. Is pressed toward the axial end wall 31b (arrow K). Accordingly, the axial gap between the seal 1 and the axial end wall 31b of the housing 31 is reduced.

  Therefore, since the gap between the seal 1 and the housing 31 is reduced by these pressing forces, excellent sealing performance is exhibited.

  Further, since part of the seal surfaces 2A and 3A of the seal 1 is made of a hard and low friction resin, the sliding resistance is reduced.

Third embodiment
In the first and second embodiments, the vane seal 1 is formed in a U-shape as a whole. However, depending on the convenience of the installation space such as the shape of the installation groove 34 provided in the vane 33, the vane seal 1 is used. It is conceivable to change the frontal shape.

  In the example of FIGS. 9 to 12 shown as the third embodiment, the vane seal 1 is a rod-like seal composed of only one straight line, and the second base portion 13 and the second base portion 13 of the seal body 11 are formed from the configuration of the first embodiment. The three convex portions 16 and the second seal surface portion 23 of the sliding member 21 are omitted.

  That is, FIG. 9 shows the vane seal 1 according to the third embodiment of the present invention. FIG. 10 shows a single seal body 11 made of a rubber-like elastic body, which is a component of the vane seal 1. FIG. 11 shows a single sliding member 21 made of resin, which is a component part of the vane seal 1, and two sliding members 21 are used in this embodiment. FIG. 12A shows a mounting structure in which the vane seal 1 is mounted on the vane 33, and FIG. 12B shows the mounting state in cross section.

  As shown in FIGS. 12A and 12B, the vane seal 1 is attached to a vane 33 that rotates together with the shaft 32 in the housing 31 of the rotary actuator and is slidably in close contact with the inner surface of the housing 31. By this, the space between the housing 31 and the vane 33 is sealed. The inner surface of the housing 31 is composed of a cylindrical inner peripheral surface 31a and axial end walls 31b having a plane perpendicular to the axis provided on both sides in the axial direction.

  As shown in FIG. 9, the vane seal 1 has a seal body 11 made of a rubber-like elastic body and a sliding member 21 made of a resin that is harder and has a lower friction than the rubber-like elastic body. The seal surface 2A of the vane seal 1 is formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the sliding member 21, and slides with the rubber-like elastic body of the seal body 11 forming the seal surface 2A. The resin of the member 21 is arranged side by side in the longitudinal direction of the seal surface 2A.

  Further, the vane seal 1 has a radial seal portion 2 disposed at a radially outward end of the vane 33. As described above, the seal surface 2A of the radial seal portion 2 is formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the sliding member 21, and the rubber-like elastic body of the seal body 11 and the sliding member 21 are formed. These resins are arranged side by side in the longitudinal direction of the seal surface 2A.

  Since the radial seal portion 2 is disposed at the radially outer end of the vane 33 and seals between the cylindrical inner peripheral surface 31 a of the housing 31, the vane 33 has a rectangular bar shape with a long cross section in the axial direction. It is formed as a seal part. The corners at both ends in the axial direction of the radial seal portion 2 are each formed of resin of the sliding member 21.

  As shown in FIG. 10, the seal body 11 made of a rubber-like elastic body has a rod-like base portion 12 having a square cross section that forms a part of the radial seal portion 2.

  In order to form a part of the seal surface 2A of the radial seal part 2 on the outer surface 12a of the base part 12 that forms a part of the radial seal part 2, the convex parts 14 and 15 are located at the center in the longitudinal direction of the base part 12. Is provided. The protrusions 14 and 15 are a combination of a first protrusion 14 having a rectangular shape and a second protrusion 15 having a similar rectangular shape, and both protrusions 14 and 15 are displaced in the longitudinal direction of the base 12. And are displaced from each other in the width direction of the base 12. One side surface 14 a of the rising direction of the first convex portion 14 is an abutting surface with respect to one sliding member 21, and the one side surface 14 b on the opposite side is an abutting surface with respect to the other sliding member 21. The leading end surface of the first convex portion 14 in the rising direction is a part of the seal surface 2A. One side surface 15 a in the rising direction of the second convex portion 15 is an abutting surface against one sliding member 21, and the other side surface 15 b is an abutting surface against the other sliding member 21. The leading end surface of the second protrusion 15 in the rising direction is a part of the seal surface 2A.

  The seal main body 11 made of this rubber-like elastic body is manufactured as a part having a line-symmetric shape as a whole.

  Two sliding members 21 made of resin are used as described above. Since the two sliding members 21 have the same shape, only one of them will be described.

  That is, as shown in FIG. 11, the sliding member 21 made of resin has a plate-like seal surface portion 22 that forms a part of the seal surface 2A of the radial seal portion 2, and one side of the seal surface portion 22 in the longitudinal direction. A plate-like covering portion 26 that covers the longitudinal end surface of the base portion 12 of the seal body 11 is integrally formed from the end portion of the seal body 11 in a direction perpendicular to the end portion. The outer surface of the covering portion 26 may form a sealing surface 3 </ b> A that is in close contact with the axial end wall 31 b of the housing 31.

  The front end portion of the seal surface portion 22 is an abutting portion for the first and second convex portions 14 and 15, and the abutting portion is provided at two positions that are displaced in the longitudinal direction in the width direction of the seal surface portion 22. The abutting surfaces 22a and 22b are formed. One abutting surface 22 a is abutted against the abutting surface 14 a of the first convex portion 14 (or the abutting surface 15 b of the second convex portion 15), and the other abutting surface 22 b is abutted against the second convex portion 15. It abuts on the surface 15a (or the abutment surface 14b of the first convex portion 14). The thickness of the seal surface portion 22 is equal to the height of the first and second convex portions 14 and 15.

  The vane seal 1 shown in FIG. 9 is manufactured by assembling and joining the seal body 11 shown in FIG. 10 and the sliding member 21 shown in FIG. The vane seal 1 is mounted in a shallow groove-shaped mounting groove 34 provided at the radially outer end of the vane 33 as shown in FIG. 12 (A), and as shown in FIG. 12 (B). It is assembled in the housing 31 together with 33 and the like. At this time, the seal 1 is mounted in a state compressed in the radial direction and the axial direction of the vane 33, thereby generating a repulsive force on the rubber-like elastic body of the seal body 11 as follows.

  That is, as shown by the arrows in FIGS. 9B and 9C, in the seal surface 2A of the radial seal portion 2, the first and second convex portions 14 of the seal body 11 at the center in the longitudinal direction of the seal surface 2A, 15 and the seal surface portions 22 of the sliding member 21 are disposed at both ends in the longitudinal direction of the seal surface 2A, respectively, so that the rubber-like elasticity of the first and second convex portions 14 and 15 of the seal body 11 is achieved. The body is compressed in the longitudinal direction of the seal surface 2A, and the repulsive force presses the resin of the seal surface portion 22 of the sliding member 21 in the axial direction, that is, toward the axial end wall 31b of the housing 31 (arrow D). Accordingly, the axial gap between the seal 1 and the axial end wall 31b of the housing 31 is reduced. Similarly, in the radial seal portion 2, the rubber-like elastic body of the base portion 12 of the seal body 11 is compressed in the height direction, and the repulsive force causes the resin on the seal surface portion 22 of the sliding member 21 to be radially outward. That is, it presses toward the cylindrical internal peripheral surface 31a of the housing 31 (arrow E). Therefore, the radial gap between the seal 1 and the cylindrical inner peripheral surface 31a of the housing 31 is reduced.

  Therefore, since the gap between the seal 1 and the housing 31 is reduced by these pressing forces, excellent sealing performance is exhibited.

  Further, since a part of the seal surface 2A of the seal 1 is made of a hard and low friction resin, the sliding resistance is reduced.

Fourth embodiment
In the example of FIGS. 13 to 16 shown as the fourth embodiment, the vane seal 1 is a rod-shaped seal composed of only one straight line, and the second base portion 13 and the second base portion 13 of the seal body 11 are formed from the configuration of the second embodiment. The two convex portions 18 and the axial sliding member 25 are omitted.

  That is, FIG. 13 shows the vane seal 1 according to the fourth embodiment of the present invention. FIG. 14 shows a single seal body 11 made of a rubber-like elastic body, which is a component of the vane seal 1. FIG. 15 shows a single sliding member 24 made of resin, which is a component of the vane seal 1. FIG. 16A shows a mounting structure for mounting the vane seal 1 on the vane 33, and FIG. 16B shows the mounting state in cross section.

  As shown in FIGS. 16A and 16B, the vane seal 1 is attached to a vane 33 that rotates together with the shaft 32 in the housing 31 of the rotary actuator and is slidably in close contact with the inner surface of the housing 31. By this, the space between the housing 31 and the vane 33 is sealed. The inner surface of the housing 31 is composed of a cylindrical inner peripheral surface 31a and axial end walls 31b having a plane perpendicular to the axis provided on both sides in the axial direction.

  As shown in FIG. 13, the vane seal 1 includes a seal body 11 made of a rubber-like elastic body and a sliding member 24 made of a resin that is harder and has a lower friction than the rubber-like elastic body. The seal surface 2A of the vane seal 1 is formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the sliding member 24, and slides with the rubber-like elastic body of the seal body 11 forming this seal surface 2A. The resin of the member 24 is arranged side by side in the longitudinal direction of the seal surface 2A.

  Further, the vane seal 1 has a radial seal portion 2 disposed at a radially outward end of the vane 33. As described above, the seal surface 2A of the radial seal portion 2 is formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the sliding member 24, and the rubber-like elastic body of the seal body 11 and the sliding member 24. These resins are arranged side by side in the longitudinal direction of the seal surface 2A.

  Since the radial seal portion 2 is disposed at the radially outer end of the vane 33 and seals between the cylindrical inner peripheral surface 31 a of the housing 31, the vane 33 has a rectangular bar shape with a long cross section in the axial direction. It is formed as a seal part. Corners at both axial ends of the radial seal portion 2 are formed by rubber-like elastic bodies of the seal body 11.

  As shown in FIG. 14, the seal body 11 made of a rubber-like elastic body has a bar-shaped base portion 12 having a square cross section that forms a part of the radial seal portion 2.

  In order to form a part of the seal surface 2A of the radial seal portion 2 on the outer surface 12a of the base portion 12 that forms a part of the radial seal portion 2, the convex portions 17 are positioned at both longitudinal ends of the first base portion 12. Are provided respectively. One side surface of the projecting portion 17 in the rising direction is an abutting portion with respect to the sliding member 24, and this abutting portion is a two abutting surface 17 a provided at a position displaced in the longitudinal direction in the width direction of the base portion 12. , 17b. The leading end surface in the rising direction of the convex portion 17 is a part of the seal surface 2A. The longitudinal end surface of the seal body 11 may form a seal surface 3A that is in close contact with the axial end wall 31b of the housing 31.

  The seal main body 11 made of this rubber-like elastic body is manufactured as a part having a line-symmetric shape as a whole.

  As shown in FIG. 15, the sliding member 24 made of resin is formed of a plate-like member that forms a part of the seal surface 2 </ b> A of the radial seal portion 2. Both end portions in the longitudinal direction of the sliding member 24 are abutting portions with respect to the convex portion 17, and the abutting portions are abutting two surfaces provided at positions displaced in the longitudinal direction in the width direction of the sliding member 24. The surfaces 24a and 24b are formed. One abutting surface 24 a is abutted against one abutting surface 17 a of the convex portion 17, and the other abutting surface 24 b is abutted against the other abutting surface 17 b of the convex portion 17. The thickness of the sliding member 24 is equal to the height of the convex portion 17.

  The seal body 11 shown in FIG. 14 and the sliding member 24 shown in FIG. 15 are assembled and joined to produce the vane seal 1 shown in FIG. The vane seal 1 is mounted in a shallow groove-shaped mounting groove 34 provided at the radially outer end of the vane 33 as shown in FIG. 16 (A), and as shown in FIG. 16 (B). It is assembled in the housing 31 together with 33 and the like. At this time, the seal 1 is mounted in a state compressed in the radial direction and the axial direction of the vane 33, thereby generating a repulsive force on the rubber-like elastic body of the seal body 11 as follows.

  That is, as shown by the arrows in FIGS. 13B and 13C, in the seal surface 2A of the radial seal portion 2, the sliding member 24 is disposed at the center in the longitudinal direction of the seal surface 2A, and the seal surface 2A Since the convex portions 17 of the seal body 11 are disposed at both ends in the longitudinal direction, the rubber-like elastic bodies of the convex portions 17 of the seal body 11 are compressed in the longitudinal direction of the seal surface 2A, respectively, and the repulsive force Is pushed toward the axial end wall 31b of the housing 31 (arrow H). Accordingly, the axial gap between the seal 1 and the axial end wall 31b of the housing 31 is reduced. Similarly, in the radial seal portion 2, the rubber-like elastic body of the base portion 12 of the seal body 11 is compressed in the height direction, and the repulsive force causes the resin of the sliding member 24 to be radially outward, that is, the cylinder of the housing 31. Press toward the inner circumferential surface 31a (arrow I). Therefore, the radial gap between the seal 1 and the cylindrical inner peripheral surface 31a of the housing 31 is reduced.

  Therefore, since the gap between the seal 1 and the housing 31 is reduced by these pressing forces, excellent sealing performance is exhibited.

  Further, since a part of the seal surface 2A of the seal 1 is made of a hard and low friction resin, the sliding resistance is reduced.

Fifth embodiment
In the example of FIGS. 17 to 20 shown as the fifth embodiment, the vane seal 1 is a front rectangle (b-shaped), and the four sides of the rectangle are the same as those of the first or third embodiment, respectively. A seal structure is provided.

  FIG. 17 shows a vane seal 1 according to a fifth embodiment of the present invention. FIG. 18 shows a single seal body 11 made of a rubber-like elastic body, which is a component of the vane seal 1. FIG. 19 shows a single sliding member 21 made of resin, which is a component of the vane seal 1, and four sliding members 21 are used in this embodiment. FIG. 20A shows a mounting structure in which the vane seal 1 is mounted on the vane 33, and FIG. 20B shows the mounting state in cross section.

  As shown in FIGS. 20A and 20B, the vane seal 1 is attached to a vane 33 that rotates together with the shaft 32 in the housing 31 of the rotary actuator, and is in close contact with the inner surface of the housing 31 so as to be slidable. By this, the space between the housing 31 and the vane 33 is sealed. The inner surface of the housing 31 is composed of a cylindrical inner peripheral surface 31a and axial end walls 31b having a plane perpendicular to the axis provided on both sides in the axial direction.

  As shown in FIG. 17, the vane seal 1 includes a seal body 11 made of a rubber-like elastic body and a sliding member 21 made of a resin that is harder and has a lower friction than the rubber-like elastic body. The seal surfaces 2A and 3A of the vane seal 1 are formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the sliding member 21, and the rubber-like elasticity of the seal body 11 forming the seal surfaces 2A and 3A. The body and the resin of the sliding member 21 are arranged side by side in the longitudinal direction of the seal surfaces 2A and 3A.

  Further, the vane seal 1 includes a radial seal portion 2 that is disposed at the radially outer end of the vane 33 and the groove bottom of the mounting groove 34. As described above, the seal surface 2A of the radial seal portion 2 is formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the sliding member 21, and the rubber-like elastic body of the seal body 11 and the sliding member 21 are formed. These resins are arranged side by side in the longitudinal direction of the seal surface 2A.

  In addition, the vane seal 1 includes axial seal portions 3 that are respectively disposed at axial end portions of the vane 33. As described above, the seal surface 3A of the axial seal portion 3 is formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the sliding member 21, and the rubber-like elastic body of the seal body 11 and the sliding member 21 are formed. These resins are arranged side by side in the longitudinal direction of the seal surface 3A.

  The radial seal portion 2 is disposed at the radially outer end of the vane 33 to seal between the cylindrical inner peripheral surface 31a of the housing 31 or at the groove bottom portion of the mounting groove 34 provided in the vane 33. Since it arrange | positions and seals between the groove bottom parts of this mounting groove 34, it is each provided in the longitudinal two sides which mutually oppose of the said seal | sticker 1 of a front rectangle. Since the axial seal portion 3 is disposed at the axial end portion of the vane 33 and seals between the axial end wall 31b of the housing 31, the two short sides facing each other in the front rectangular seal 1. Are provided respectively. The vane seal 1 has corners where the radial seal portion 2 and the axial seal portion 3 intersect at the four corners of the front rectangle. Each corner is formed of resin of the sliding member 21.

  As shown in FIG. 18, the seal body 11 made of a rubber-like elastic body has a front rectangular base 12 that forms a part of the radial seal part 2 and a part of the axial seal part 3. In each of the four sides, the convex portions 14 and 15 form the central portion of each side of the base portion 12 in the longitudinal direction in order to form a part of the seal surface 2A of the radial seal portion 2 or a part of the seal surface 3A of the axial seal portion 3. It is provided in the position. The protrusions 14 and 15 are a combination of a first protrusion 14 having a rectangular shape and a second protrusion 15 having a similar rectangular shape, and both the protrusions 14 and 15 are arranged in the longitudinal direction of each side of the base 12. In addition to being provided in a displaced manner, they are also provided to be displaced from each other in the side width directions of the base 12. One side surface 14 a of the rising direction of the first convex portion 14 is an abutting surface for one sliding member 21, and the other side surface 14 b is an abutting surface for the other one sliding member 21. The leading end surface of the first convex portion 14 in the rising direction is a part of the seal surfaces 2A and 3A. One side surface 15 a in the rising direction of the second convex portion 15 is an abutting surface against one sliding member 21, and the other side surface 15 b is an abutting surface against the other one sliding member 21. The leading end surface of the second convex portion 15 in the rising direction is a part of the seal surfaces 2A and 3A.

  The seal main body 11 made of this rubber-like elastic body is manufactured as a part having a line-symmetric shape as a whole.

  Four sliding members 21 made of resin are used as described above. Since the four sliding members 21 have the same shape, only one of them will be described.

  That is, as shown in FIG. 19, the sliding member 21 made of resin has a plate-like first seal surface portion 22 that forms part of the seal surface 2 </ b> A of the radial seal portion 2, and the first seal surface portion 22. A plate-like second seal surface portion 23 forming a part of the seal surface 3A of the axial direction seal portion 3 is integrally formed from one end portion in the longitudinal direction toward the right-angle direction.

  The front end portion of the first seal surface portion 22 is an abutting portion for the first and second convex portions 14 and 15, and this abutting portion is provided at a position displaced in the longitudinal direction in the width direction of the first seal surface portion 22. The two abutting surfaces 22a and 22b are formed. One abutting surface 22 a is abutted against the abutting surface 14 a of the first convex portion 14 (or the abutting surface 15 b of the second convex portion 15), and the other abutting surface 22 b is abutted against the second convex portion 15. It abuts on the surface 15a (or the abutment surface 14b of the first convex portion 14). The thickness of the first seal surface portion 22 is equal to the height of the first and second convex portions 14 and 15.

  The front end portion of the second seal surface portion 23 is also an abutting portion for the first and second convex portions 14 and 15, and the abutting portion is a position displaced in the longitudinal direction in the width direction of the second seal surface portion 23. Are formed by two abutting surfaces 23a and 23b. One abutting surface 23 a is abutted against the abutting surface 14 b of the first convex portion 14 (or the abutting surface 15 a of the second convex portion 15), and the other abutting surface 23 b is abutted against the second convex portion 15. It abuts on the surface 15b (or the abutment surface 14a of the first convex portion 14). The thickness of the second seal surface portion 23 is equal to the height of the first and second convex portions 14 and 15.

  The vane seal 1 shown in FIG. 17 is manufactured by assembling and joining the seal body 11 shown in FIG. 18 and the sliding member 21 shown in FIG. The vane seal 1 is mounted in a deep groove-shaped mounting groove 34 provided in the vane 33 as shown in FIG. 20 (A), and assembled inside the housing 31 together with the vane 33 and the like as shown in FIG. 20 (B). It is done. At this time, the seal 1 is mounted in a state compressed in the radial direction and the axial direction of the vane 33, thereby generating a repulsive force on the rubber-like elastic body of the seal body 11 as follows.

  That is, as shown by the arrows in FIGS. 17B and 17C, the first and second convex portions of the seal body 11 are respectively provided in the center portion in the longitudinal direction of the seal surface 2A in the seal surface 2A of the radial seal portion 2. 14 and 15 and the first seal surface portions 22 of the sliding member 21 are disposed at both ends in the longitudinal direction of the seal surface 2A, respectively, and therefore the first and second convex portions 14 and 15 of the seal body 11 are disposed. The rubber-like elastic body is compressed in the longitudinal direction of the seal surface 2A, and the resin of the first seal surface portion 22 of the sliding member 21 is pressed toward the axial direction, that is, the axial end wall 31b of the housing 31 by the repulsive force ( Arrow D). Accordingly, the axial gap between the seal 1 and the axial end wall 31b of the housing 31 is reduced. Similarly, in the radial seal portion 2, the rubber-like elastic body of the base portion 12 of the seal main body 11 is compressed in the height direction, and the resin of the first seal surface portion 22 of the sliding member 21 is radiated in the radial direction by the repulsive force. It is pressed toward the outside, that is, the cylindrical inner peripheral surface 31a of the housing 31 or radially inward, that is, toward the bottom of the mounting groove 34 (arrow E). Accordingly, the radial gap between the seal 1 and the cylindrical inner peripheral surface 31a of the housing 31 and the radial gap between the seal 1 and the groove bottom of the mounting groove 34 are reduced.

  In the seal surface 3A of the axial seal portion 3, the first and second convex portions 14 and 15 of the seal body 11 are disposed at the longitudinal center portion of the seal surface 3A, and at both longitudinal ends of the seal surface 3A. Since the second seal surface portion 23 of the sliding member 21 is disposed, the rubber-like elastic bodies of the first and second convex portions 14 and 15 of the seal body 11 are compressed in the longitudinal direction of the seal surface 3A. The resin of the second seal surface portion 23 of the sliding member 21 is pressed by the repulsive force radially outward, that is, toward the cylindrical inner peripheral surface 31a of the housing 31 or radially inward, that is, toward the groove bottom of the mounting groove 34 (arrow F ). Accordingly, the radial gap between the seal 1 and the cylindrical inner peripheral surface 31a of the housing 31 and the radial gap between the seal 1 and the groove bottom of the mounting groove 34 are reduced. Similarly, in the axial seal portion 3, the rubber-like elastic body of the base portion 12 of the seal body 11 is compressed in the height direction, and the repulsive force causes the resin of the second seal surface portion 23 of the sliding member 21 to be axial. It pushes toward the axial direction end wall 31b of the housing 31 (arrow G). Accordingly, the axial gap between the seal 1 and the axial end wall 31b of the housing 31 is reduced.

  Therefore, since the gap between the seal 1 and the housing 31 is reduced by these pressing forces, excellent sealing performance is exhibited.

  Further, since part of the seal surfaces 2A and 3A of the seal 1 is made of a hard and low friction resin, the sliding resistance is reduced.

Sixth embodiment
In the example of FIGS. 21 to 24 shown as the sixth embodiment, the vane seal 1 is a front rectangle (b-shaped), and the four sides of the rectangle are the same as those of the second embodiment or the fourth embodiment, respectively. A seal structure is provided.

  FIG. 21 shows a vane seal 1 according to a sixth embodiment of the present invention. FIG. 22 shows a single seal body 11 made of a rubber-like elastic body, which is a component of the vane seal 1. FIG. 23A shows a single radial sliding member 24 made of resin, which is a component of the vane seal 1, and two radial sliding members 24 are used in this embodiment. FIG. 23B shows a single axial sliding member 25 made of resin, which is a component part of the vane seal 1, and two axial sliding members 25 are used in this embodiment. FIG. 24A shows a mounting structure in which the vane seal 1 is mounted on the vane 33, and FIG. 24B shows the mounting state in cross section.

  As shown in FIGS. 24A and 24B, the vane seal 1 is attached to a vane 33 that rotates together with the shaft 32 in the housing 31 of the rotary actuator and is slidably in close contact with the inner surface of the housing 31. By this, the space between the housing 31 and the vane 33 is sealed. The inner surface of the housing 31 is composed of a cylindrical inner peripheral surface 31a and axial end walls 31b having a plane perpendicular to the axis provided on both sides in the axial direction.

  As shown in FIG. 21, the vane seal 1 includes a seal body 11 made of a rubber-like elastic body, a radial sliding member 24 made of a resin that is harder and less frictional than the rubber-like elastic body, and an axial slide. Member 25. The sealing surfaces 2A and 3A of the vane seal 1 are formed by combining the rubber-like elastic body of the seal body 11 and the resin of the radial sliding member 24 or the rubber-like elastic body of the seal body 11 and the axial sliding member 25. The rubber-like elastic body of the seal body 11 that forms the seal surfaces 2A and 3A and the resin of the sliding members 24 and 25 are arranged side by side in the longitudinal direction of the seal surfaces 2A and 3A. .

  Further, the vane seal 1 includes a radial seal portion 2 that is disposed at the radially outer end of the vane 33 and the groove bottom of the mounting groove 34. As described above, the seal surface 2A of the radial seal portion 2 is formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the radial sliding member 24, and the rubber-like elastic body of the seal body 11 and the radial direction. The resin of the sliding member 24 is arranged side by side in the longitudinal direction of the seal surface 2A.

  In addition, the vane seal 1 includes axial seal portions 3 that are respectively disposed at axial end portions of the vane 33. As described above, the seal surface 3A of the axial seal portion 3 is formed by a combination of the rubber-like elastic body of the seal body 11 and the resin of the axial sliding member 25, and the rubber-like elastic body of the seal body 11 and the axial direction. The resin of the sliding member 25 is arranged side by side in the longitudinal direction of the seal surface 3A.

  The radial seal portion 2 is disposed at the radially outer end of the vane 33 to seal between the cylindrical inner peripheral surface 31a of the housing 31 or at the groove bottom portion of the mounting groove 34 provided in the vane 33. Since it arrange | positions and seals between the groove bottom parts of this mounting groove 34, it is each provided in the longitudinal two sides which mutually oppose of the said seal | sticker 1 of a front rectangle. Since the axial seal portion 3 is disposed at the axial end portion of the vane 33 and seals between the axial end wall 31b of the housing 31, the two short sides facing each other in the front rectangular seal 1. Are provided respectively. The vane seal 1 has corners where the radial seal portion 2 and the axial seal portion 3 intersect at the four corners of the front rectangle. Each corner is formed by a rubber-like elastic body of the seal body 11.

  As shown in FIG. 22, the seal body 11 made of a rubber-like elastic body has a front rectangular base 12 that forms part of the radial seal part 2 and part of the axial seal part 3. In order to form a part of the seal surface 2A of the radial seal portion 2 on each of the two long sides of the four sides, the first convex portions 17 are provided at both ends in the longitudinal direction of each side, and short In order to form part of the seal surface 3A of the axial seal portion 3 on each of the two sides of the hand, the second convex portions 18 are provided at both ends in the longitudinal direction of the respective sides, and the first and second convex portions are provided. The portions 17 and 18 are provided as front L-shaped convex portions that are integral with each other.

  One side of the rising direction of the first convex portion 17 is an abutting portion with respect to the radial sliding member 24, and this abutting portion is a two-surface provided at a position displaced in the longitudinal direction in the width direction of the base portion 12. It is formed by the abutting surfaces 17a and 17b. The leading end surface of the first convex portion 17 in the rising direction is a part of the seal surface 2A. One side of the rising direction of the second convex portion 18 is an abutting portion with respect to the axial sliding member 25, and the abutting portion is a two-surface provided at a position displaced in the longitudinal direction in the width direction of the base portion 12. The abutting surfaces 18a and 18b are formed. The leading end surface of the second protrusion 18 in the rising direction is a part of the seal surface 3A.

  The seal main body 11 made of this rubber-like elastic body is manufactured as a part having a line-symmetric shape as a whole.

  As described above, the sliding members 24 and 25 made of resin include the two radial sliding members 24 forming a part of the radial seal portion 2 and the axial sliding members forming a part of the axial seal portion 3. Two 25 are used.

  Of these, first, two radial sliding members 24 are used as described above, but since the two radial sliding members 24 have the same shape, only one of them will be described.

  That is, the radial sliding member 24 is made of a plate-like member that forms a part of the seal surface 2A of the radial seal portion 2 as shown in FIG. Both ends in the longitudinal direction of the radial sliding member 24 are abutting portions with respect to the first convex portion 17, and the abutting portions are provided at positions displaced in the longitudinal direction in the width direction of the radial sliding member 24. The two abutting surfaces 24a and 24b are formed. One abutting surface 24 a is abutted against one abutting surface 17 a of the first convex portion 17, and the other abutting surface 24 b is abutted against the other abutting surface 17 b of the first convex portion 17. The thickness of the radial sliding member 24 is equal to the height of the first convex portion 17.

  On the other hand, two axial sliding members 25 are used as described above. Since the two axial sliding members 25 have the same shape, only one of them will be described.

  That is, each of the axial sliding members 25 is formed of a plate-like member that forms a part of the seal surface 3A of the axial seal portion 3 as shown in FIG. Both end portions in the longitudinal direction of the axial sliding member 25 serve as abutting portions with respect to the second convex portion 18, and the abutting portions are provided at positions displaced in the longitudinal direction in the width direction of the axial sliding member 25. The two abutting surfaces 25a and 25b are formed. One abutting surface 25 a is abutted against one abutting surface 18 a of the second convex portion 18, and the other abutting surface 25 b is abutted against the other abutting surface 18 b of the second convex portion 18. The thickness of the axial sliding member 25 is equal to the height of the second convex portion 18.

  The seal body 11 of FIG. 22, the radial sliding member 24 of FIG. 23A, and the axial sliding member 25 of FIG. Produced. The vane seal 1 is mounted in a deep groove-shaped mounting groove 34 provided in the vane 33 as shown in FIG. 24A, and is assembled inside the housing 31 together with the vane 33 and the like as shown in FIG. It is done. At this time, the seal 1 is mounted in a state compressed in the radial direction and the axial direction of the vane 33, thereby generating a repulsive force on the rubber-like elastic body of the seal body 11 as follows.

  That is, as indicated by arrows in FIGS. 21B and 21C, in the seal surface 2A of the radial seal portion 2, the radial sliding member 24 is disposed at the longitudinal center portion of the seal surface 2A. Since the first convex portions 17 of the seal main body 11 are disposed at both longitudinal ends of the seal surface 2A, the rubber-like elastic bodies of the first convex portions 17 of the seal main body 11 are respectively in the longitudinal direction of the seal surface 2A. When compressed, the repulsive force presses itself toward the axial end wall 31b of the housing 31 (arrow H). Accordingly, the axial gap between the seal 1 and the axial end wall 31b of the housing 31 is reduced. Similarly, in the radial seal portion 2, the rubber-like elastic body of the base portion 12 of the seal body 11 is compressed in the height direction, and the repulsive force causes the resin of the radial slide member 24 to be radially outward, that is, the housing 31. It is pressed toward the cylindrical inner peripheral surface 31a or radially inward, that is, toward the groove bottom of the mounting groove 34 (arrow I). Accordingly, the radial gap between the seal 1 and the cylindrical inner peripheral surface 31a of the housing 31 and the radial gap between the seal 1 and the groove bottom of the mounting groove 34 are reduced.

  On the seal surface 3A of the axial seal portion 3, the rubber-like elastic body of the second convex portion 18 of the seal body 11 is compressed in the longitudinal direction of the seal surface 3A, and the repulsive force makes itself radially outward, that is, the housing. It is pressed toward the cylindrical inner peripheral surface 31a of 31 or radially inward, that is, toward the groove bottom of the mounting groove 34 (arrow J). Accordingly, the radial gap between the seal 1 and the cylindrical inner peripheral surface 31a of the housing 31 and the radial gap between the seal 1 and the groove bottom of the mounting groove 34 are reduced. Similarly, in the axial seal portion 3, the rubber-like elastic body of the base portion 12 of the seal body 11 is compressed in the height direction, and the repulsive force causes the resin of the axial sliding member 25 to be axially, that is, the shaft of the housing 31. It pushes toward the direction end wall 31b (arrow K). Accordingly, the axial gap between the seal 1 and the axial end wall 31b of the housing 31 is reduced.

  Therefore, since the gap between the seal 1 and the housing 31 is reduced by these pressing forces, excellent sealing performance is exhibited.

  Further, since part of the seal surfaces 2A and 3A of the seal 1 is made of a hard and low friction resin, the sliding resistance is reduced.

DESCRIPTION OF SYMBOLS 1 Seal for vanes 2 Radial seal part 2A, 3A Seal surface 3 Axial seal part 11 Seal main body 12,13 Base part 14,15,16 Convex part 21,24,25 Sliding member 22,23 Seal surface part 26 Cover part 31 Housing 31a Cylindrical inner peripheral surface 31b Axial end wall 32 Axis 33 Vane 34 Mounting groove

Claims (4)

In a vane seal that is mounted on a vane that rotates in a housing and is slidably in close contact with the inner surface of the housing,
A seal body made of a rubber-like elastic body, and a sliding member made of a resin that is harder and lower in friction than the rubber-like elastic body,
Forming a seal surface of the vane seal by a combination of the rubber-like elastic body and the resin;
The vane seal, wherein the rubber-like elastic body forming the seal surface and the resin are arranged side by side in the longitudinal direction of the seal surface. The vane seal according to claim 1,
A radial seal portion disposed at a radially outward end of the vane;
The seal surface of the radial seal portion is formed by a combination of the rubber-like elastic body and the resin, and the rubber-like elastic body and the resin are arranged side by side in the longitudinal direction of the seal surface. Vane seal. The vane seal according to claim 2,
An axial seal portion disposed at an axial end of the vane;
The seal surface of the axial seal portion is formed by a combination of the rubber-like elastic body and the resin, and the rubber-like elastic body and the resin are arranged side by side in the longitudinal direction of the seal surface. Vane seal. The vane seal according to claim 3,
A vane seal, wherein a corner portion where the radial seal portion and the axial seal portion intersect is formed of either the resin or the rubber-like elastic body.

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