JP5965871B2 - Seal member and vane type rotary actuator having the same - Google Patents

Description

  The present invention relates to a seal member that regulates inflow and outflow of fluid and a vane-type rotary actuator including the seal member.

  Conventionally, for example, in an actuator in which the position of a moving body in a housing is switched by supplying and discharging a fluid such as compressed air, a sealing member that regulates inflow and outflow of fluid between the housing and the moving body is disclosed in Patent Literature There is a packing described in 1. In the packing described in Patent Document 1, the inflow and outflow of fluid between the housing and the moving body are regulated by forming a seal surface for regulating the inflow and outflow of fluid in an arc shape. . In the regulation of the inflow and outflow of the fluid, the restoring force of the packing which tries to restore from the state compressed between the housing and the moving body mainly acts.

Japanese Utility Model Publication No. 62-024133

  By the way, if the packing state is tilted from the upright state due to relative movement between the housing and the moving body, the packing allowance (crushing allowance) for the housing is reduced. The restoring force to the housing is reduced. However, the inclination of the packing state from the upright state is suppressed by providing a protruding portion in the direction in which the packing is inclined as in Patent Document 1. However, even if the protrusion is provided in the direction in which the packing is inclined in this way, it cannot be said that it can be prevented from being completely tilted from the upright state. There is a risk that the packing allowance of the packing will be small.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a sealing member capable of securing a sufficient tightening allowance with respect to a housing even when tilted from an upright state, and a vane including the sealing member. It is to provide a mold rotary actuator.

A seal member that solves the above problem is mounted in a mounting groove of a moving body that moves in the housing by supplying and discharging fluid to the housing, and an arc-shaped sealing surface that restricts inflow and outflow of fluid between the housing and the moving body The seal member includes a seal body formed with a width smaller than the opening width of the mounting groove , passes through a seal line formed on the seal surface in an upright state, and seals If a reference line a line intersecting perpendicularly to the tangent plane, and a starting point from the distance to the reference distance to the seal line when said seal body in said reference line is inclined in the mounting groove, the origin wherein the seal body is to include the cross-sectional shape which the seal surface is formed so that the distance to the sealing position is longer than the reference distance when the tilted from

Moreover, such sealing member, on opposite sides to the pair of side walls of the mounting groove of said seal body, a first projection projecting toward the one of the pair of side walls, one of the pair of side walls A second protrusion protruding toward the other of the first protrusion and the second protrusion is formed continuously or discontinuously, and the starting point is the most protruding portion of the first protrusion and the first protrusion on the reference line. It is determined at a position connecting the most protruding portion of the two protrusions .

Further, the protrusions are inclined surfaces in which the amount of the protrusion facing the pair of side walls of the mounting groove increases from the inner side to the outer side of the mounting groove.
Furthermore, the housing is provided with a housing in which both ends of the cylindrical cylinder tube in the axial direction are sealed with a sealing block. The output shaft is rotatably supported in the housing, and the vane is integrally attached to the output shaft. The sealing member can be applied to the vane type rotary actuator. In this case, preferably, in the seal body of the seal member, when the boundary between the cylinder tube and the sealing block in the housing is a corner, the position corresponds to the corner, and the pair of side walls of the mounting groove of the seal body on the side facing it has a first projection projecting toward the one of the pair of side walls, and a second projection is formed projecting toward the other of said pair of side walls The starting point is determined on the reference line at a position connecting the most protruding portion of the first protrusions and the most protruding portion of the second protrusions .

Furthermore, in such a vane-type rotary actuator, it is preferable that the protrusion is formed on an inclined surface in which a surface facing the pair of side walls of the mounting groove increases in a protruding amount from the inner side to the outer side of the mounting groove.
Further, the vane is formed with a long blade portion and a short blade portion so as to face the radial direction of the output shaft, and the mounting groove is formed with respect to the housing when the vane rotates. The outer peripheral surface that slides through a seal member extends across both end surfaces in the axial direction of the vane and both end surfaces in the radial direction of the long blade portion and the short blade portion, and the seal body includes the vane A main body seal portion fitted in the mounting groove formed on both axial end surfaces of the main body, and a wing portion seal portion fitted in the mounting groove formed on the radial end surfaces of the long wing portion and the short wing portion. And when the portion where the main body seal portion and the wing seal portion intersect is defined as an intersection, the curve of the seal surface, which is a distance from the starting point, gradually becomes gentle toward the intersection. It is preferable to be formed.

  According to the present invention, it is possible to ensure a sufficient tightening allowance for the housing even when tilted from the upright state.

(A), (b) is a conceptual diagram of a vane type rotary actuator. The schematic diagram explaining a sealing member. The perspective view which shows the corner | angular part seal part of a sealing member. The perspective view seen from the X side of FIG. 3 which shows the corner | angular part seal part of a sealing member. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 4 showing a corner seal portion of the seal member. Sectional drawing which shows the corner | angular part seal part of the seal member in another example. The schematic diagram which shows the sealing member in another example.

Hereinafter, an embodiment of the vane type rotary actuator will be described.
As shown in FIGS. 1 (a) and 1 (b), the vane type rotary actuator of this embodiment has an outer shell formed by a cylinder tube 10 made of a metal such as a hollow prismatic aluminum. The cylinder tube 10 includes a first and a second connected to a supply / discharge device that supplies a fluid (compressed air in this embodiment) and discharges the fluid to the outside (in the present embodiment, the atmosphere). Supply / discharge ports P1 and P2 are formed. A pressure chamber 11c (described later) capable of storing fluid communicates with the first supply / discharge port P1, and a pressure chamber 11d (described later) capable of storing fluid communicates with the second supply / discharge port P2.

  The fluid is supplied from the first supply / discharge port P1 to the pressure chamber 11c, and the fluid in the pressure chamber 11d is discharged from the second supply / discharge port P2, so that the vane 13 as a moving body accommodated in the cylinder tube 10 is obtained. Is switched and controlled in the direction (position) with a rotational movement toward the second supply / discharge port P2. On the other hand, the fluid is supplied from the second supply / discharge port P2 to the pressure chamber 11d and the fluid in the pressure chamber 11c is discharged from the first supply / discharge port P1, so that the vane 13 is connected to the first supply / discharge port P1 side. The direction is controlled to be switched with a turning motion toward.

  Inside the cylinder tube 10, an accommodating portion 11 that accommodates the output shaft 12 and the vane 13 is formed. The inside of this accommodating part 11 has comprised the outline which connected the arc-shaped large diameter accommodating part 11a and the arc-shaped small diameter accommodating part 11b whose diameter is smaller than this large diameter accommodating part 11a. In the accommodating part 11, the output shaft 12 is accommodated along the axial direction of the cylinder tube 10. The output shaft 12 is made of a metal such as steel.

  In the accommodating portion 11, the output shaft 12 is inserted into the vane 13, and the vane 13 is fixedly attached to the output shaft 12 so as to rotate integrally with the output shaft 12. The vane 13 includes a long blade portion 13 a and a short blade portion 13 b that are opposed to each other in the radial direction of the output shaft 12. The long wing portion 13a has a longer distance from the output shaft 12 to the tip along the radial direction than the short wing portion 13b, and the tip is attached to the inner surface of the large-diameter housing portion 11a of the housing portion 11 during the rotation operation. 14 is formed so as to slide (swing) through 14. On the other hand, the short blade portion 13b has a shorter distance from the output shaft 12 to the tip along the radial direction than the long blade portion 13a, and the tip is sealed to the inner surface of the small-diameter housing portion 11b of the housing portion 11 during the rotation operation. It is formed to have a length that slides (swings) through the member 14. The vane 13 is made of a metal such as aluminum.

  Further, as shown in FIG. 2, in the accommodating portion 11, one end side and the other end side in the axial direction of the output shaft 12 (the front side in FIG. 1A and FIG. 1B) and the lower side (FIG. 1A). , (B) on the back side of the paper surface) is sealed by sealing blocks BL1 and BL2 made of a metal such as aluminum different from the cylinder tube 10. Thus, in this embodiment, the housing H of the vane type rotary actuator is configured by the cylinder tube 10 and the sealing blocks BL1 and BL2.

  In relation to the sealing blocks BL1 and BL2, the output shaft 12 described above is formed in such a length that both ends in the axial direction protrude outward from the sealing blocks BL1 and BL2. Further, the output shaft 12 is supported by the sealing blocks BL1 and BL2 such that the output shaft 12 can rotate by being fixed in the radial direction. As described above, the vane type rotary actuator outputs the rotational force accompanying the rotation operation of the vane 13 to the outside through the rotation operation of the output shaft 12.

  Further, regarding the relationship with the sealing blocks BL1 and BL2, the vane 13 described above slides (oscillates) at both axial end surfaces on the inner surfaces of the sealing blocks BL1 and BL2 via the seal member 14 during the rotation operation. ) Is formed to a length (height). For this reason, the housing H (large diameter accommodating portion 11a, small diameter accommodating portion 11b, sealing blocks BL1, BL2) and vanes 13 are provided on the first supply / exhaust port P1 side in the accommodating portion 11 through the supply / exhaust port P1. A pressure chamber 11c through which fluid is supplied and discharged is defined. On the other hand, on the side of the second supply / discharge port P2 in the storage part 11, the housing H (large-diameter storage part 11a, small-diameter storage part 11b, sealing blocks BL1, BL2) and the vane 13 allow fluid to flow through the supply / discharge port P2. A pressure chamber 11d is supplied and discharged.

  As shown in FIG. 2, the vane 13 includes an outer peripheral surface that slides (swings) through the housing H and the seal member 14 during the rotation operation, that is, both axial end surfaces of the vane 13, the long blade portion 13 a, A mounting groove 13c is formed to extend across both radial end surfaces of the short blade portion 13b. The mounting groove 13 c is formed continuously along the outer peripheral surface of the vane 13.

  A sealing member 14 made of an elastic member such as rubber that restricts the inflow and outflow of fluid between the housing H and the vane 13, that is, between the pressure chambers 11c and 11d, is mounted in the mounting groove 13c. The seal member 14 is attached to the portions corresponding to the mounting grooves 13c at both ends in the axial direction of the vane 13 and the radial ends of the long blade portion 13a and the short blade portion 13b so that the seal member 14 can be fitted into the continuous mounting groove 13c. A portion corresponding to the groove 13c is integrally formed.

  Further, in the housing H, a corner portion 11e that is a boundary between the inner surface of the housing portion 11 and the inner surfaces of the sealing blocks BL1 and BL2 is formed. Then, in the seal member 14, fluid flows between the housing H and the vane 13 at portions corresponding to the corners 11 e of the housing H (four locations in the present embodiment) even if the vane 13 is operated. And the corner | angular part seal | sticker part 15 which gave the device for controlling an outflow is formed.

Next, with reference to FIG.3 and FIG.4, the corner | angular part sealing part 15 in the sealing member 14 is demonstrated in detail.
The corner seal portion 15 includes a main body seal portion 16 as a seal body fitted in the mounting grooves 13c at both ends in the axial direction of the vane 13, and mounting grooves 13c at both ends in the radial direction of the long blade portion 13a and the short blade portion 13b of the vane 13. It corresponds to a portion where the wing seal portion 17 as a seal body fitted into the crossing portion, and is formed in a bowl shape bent substantially at a right angle. The main body seal portion 16 and the wing portion seal portion 17 are formed in a round shape, that is, in a circular shape, on the housing H side and on the bottom side of the mounting groove 13c. Therefore, in the seal member 14, an arcuate curved surface SS is formed on the housing H side of the main body seal portion 16 and the wing portion seal portion 17. In particular, in the corner seal part 15, an arcuate curved surface SS is formed on the main body seal part 16 and the wing part seal part 17 on the housing H side.

  Also, the corner seal portion 15 has ribs 18 that assist both sides of the mounting groove 13c so that the seal member 14 can be kept upright along the side walls facing the pair of side walls. Is formed. The ribs 18 are connected across the main body seal portion 16 and the wing seal portion 17 in each corner seal portion 15 corresponding to the mounting grooves 13 c at both axial ends of the vane 13. Further, the width of the ribs 18 on both side surfaces of the corner seal portion 15 is the same width as the diameter of the main body seal portion 16 to be connected, and such a width is formed to be smaller than the opening width of the mounting groove 13c. Has been.

  Further, in the corner seal portion 15, assuming that a portion where the main body seal portion 16 and the wing portion seal portion 17 intersect is an intersection portion 19, the curved surface SS curves from the main body seal portion 16 and the wing portion seal portion 17 toward the intersection portion 19. Is formed so that it gradually becomes gentle. That is, in the rib 18 of the corner seal portion 15, the ratio of the curved surface SS to the width of the seal member 14 is set to increase from the main body seal portion 16 and the wing portion seal portion 17 toward the intersecting portion 19. Yes. In the main body seal portion 16, the curved surface SS occupies all of the width of the seal member 14 at portions other than the corner seal portion 15. Further, with respect to the wing seal portion 17, in the portions other than the corner seal portion 15, the relationship between the proportions of the curved surface SS and the rib 18 is kept constant.

  Further, on the ribs 18 of the corner seal portion 15, projections 20 for restricting the inclination of the seal member 14 are provided on both sides of the rib 18 on the side facing the pair of side walls of the mounting groove 13 c. Is formed. The protrusion 20 is formed in a columnar shape protruding toward the mounting groove 13c. Further, the protrusion 20 is formed discontinuously with respect to the rib 18 only at a portion corresponding to the corner seal portion 15 in the rib 18.

  In the protrusion 20, a thickened portion 21 having the largest thickness is formed on the corner 11 e side of the housing H, that is, on the intersecting portion 19 side of the corner seal portion 15. For this reason, the amount of protrusion of the surface of the protrusion 20 facing the pair of side walls of the mounting groove 13c increases from the inner side (vane 13 side) of the mounting groove 13c toward the outer side (corner portion 11e of the housing H) ( The inclined surface 22 has a slope. Further, the width of the thick portions 21 on both side surfaces of the corner seal portion 15 is larger than the diameter of the main body seal portion 16 to be connected, and such a width is larger than the opening width of the mounting groove 13c. It is formed with.

  In the corner seal portion 15 configured as described above, the curved surface SS of the main body seal portion 16 and the wing portion seal portion 17 particularly acts as a seal surface that seals between the housing H and the vane 13. That is, in the corner seal portion 15, the curved surface SS that continues from the main body seal portion 16 and the wing portion seal portion 17 acts as a seal surface that seals between the corner portion 11 e and the vane 13 in the housing. In the main body seal portion 16 and the wing portion seal portion 17, the curved surface SS other than the corner seal portion 15 acts as a seal surface as described above.

  3 and 4, when the seal member 14 is in an upright state in the corner seal portion 15, the center line SL passing through the center in the width direction of the curved surface SS is the vane 13, that is, The protrusion of the seal member 14 with respect to the housing H becomes the largest while protruding most from the mounting groove 13c. For this reason, on the curved surface SS, when the seal member 14 is in an upright state, the center line SL acts as a seal line that seals between the housing H and the vane 13. That is, the center line SL passing over the main body seal portion 16 and the wing portion seal portion 17 is a seal line that seals between the corner portion 11e and the vane 13 in the housing H when the seal member 14 is in an upright state. Works. In addition, about the main body seal part 16 and the wing | blade part seal | sticker part 17, centerline SL of parts other than the corner | angular part seal | sticker part 15 acts as a seal line like having mentioned above.

Next, the curved surface SS formed on the corner seal portion 15 will be described in more detail.
As shown in FIG. 5, in the cross section from the intersection 19 of the corner seal 15 to the inside of the mounting groove 13c, it passes through the center line SL and intersects perpendicularly to the tangent line Y of the curved surface SS. A point on the reference line L extending vertically from the center line SL and defining the distance to the curved surface SS is defined as a starting point O. When the distance R1 (diameter) from the starting point O to the center line SL is used as a reference distance, the distance from the starting point O is larger than the reference distance as the curved surface SS is further away from the center line SL along the circumferential surface of the curved surface SS. It is formed to be long. That is, the distance from the starting point O to the curved surface SS of the intersecting portion 19 is formed so as to increase as the angle formed with the reference line L increases.

  For example, the distance R2 from the starting point O that forms a specific angle with the reference line L to the curved surface SS of the intersection 19 is longer than the reference distance R1. Such a distance R2 is based on a distance R3 corresponding to the reference distance from the starting point O to the virtual surface Z that makes the specific angle with the reference line L with respect to the virtual surface Z when the distance from the starting point O is the reference distance. It will be a long time. For this reason, the curved surface SS of the intersecting portion 19 is configured so that the tightening margin of the seal member 14 with respect to the housing H increases as the distance from the center line SL increases, that is, the outer side of the arc. The difference in the tightening allowance of the seal member 14 relative to the virtual surface Z relative to the housing H increases. Therefore, in this embodiment, when the seal member 14 is in the upright state, the fastening margin of the seal member 14 with respect to the housing H is configured to be minimum.

For the starting point O, the center at which the corner seal portion 15 is assumed to be tilted when the vane 13 is rotated is determined.
As shown in FIG. 5, since the width of the corner seal portion 15 and the mounting groove 13c is larger than the opening width of the mounting groove 13c, the width of the corner seal portion 15 is larger than the opening width of the mounting groove 13c. Is mounted by being pushed into the mounting groove 13c. For this reason, the protrusion 20 is elastically deformed into a compressed state, and is pressed against the mounting groove 13c by a restoring force to the original shape.

  In the corner seal portion 15 mounted in the mounting groove 13c in this way, the thick portion 21 closest to the corner portion 11e of the housing H in the projection 20 is most elastically deformed. Therefore, when the vane 13 rotates, it is assumed that an inclination centering on a position connecting the thickest protruding portions 21 on both sides of the corner seal portion 15 on the reference line L is generated. For this reason, in this embodiment, on the reference line L, the starting point O is determined at a position connecting the thick portions 21 on both sides of the corner seal portion 15.

Next, the operation of the vane type rotary actuator equipped with the seal member 14 of this embodiment will be described.
In the corner seal portion 15, the curved surface SS of the intersecting portion 19 has a minimum tightening allowance of the seal member 14 with respect to the housing H when sealing in the seal line in an upright state. When the seal line deviates from the seal line in the upright state due to inclination or the like, the allowance for tightening the seal member 14 with respect to the housing H increases.

  By increasing the tightening allowance of the seal member 14 with respect to the housing H, the corner seal portion 15 is positioned between the housing H and the vane 13 when the vane 13 rotates. It will shift to the strongly compressed elastic deformation state, and the restoring force of the corner seal 15 will also act strongly. Thereby, in the corner | angular part seal | sticker part 15, even if it raise | generates by sliding resistance with the housing H, and raise | generates a twist and a fall, the inclination will be restrained and the inclination beyond it will come to be suppressed.

  Further, as the corner seal portion 15 is tilted, the tightening allowance of the seal member 14 with respect to the housing H increases, so that the fluid inflow and outflow between the housing H and the vane 13 are regulated and sealed. The restoring force of the corner seal portion 15 is increased.

  Further, in the corner seal portion 15, the width of the corner seal portion 15 is larger than the opening width of the mounting groove 13c by the amount that the protrusion 20 protrudes, so the corner seal portion 15 is mounted in the mounting groove 13c. At this time, it is restrained more strongly from both sides than the case where the protrusion 20 is not formed. Moreover, since the thick part 21 is formed in such a protrusion 20 in a part near the curved surface SS of the intersecting part 19 in the corner seal part 15, the corner part 11e of the housing H has a corner as described above. The part seal part 15 is strongly restrained from both sides.

  When the corner seal portion 15 is strongly restrained from both sides, the corner seal portion 15 is easily positioned with respect to the mounting groove 13c, and the upright state is easily maintained. Furthermore, in this embodiment, in the corner portion 11e of the housing H, the corner seal portion 15 is easily positioned with respect to the mounting groove 13c, and the upright state is easily maintained.

  Moreover, in the corner | angular part seal part 15, since the inclined surface 22 is formed in the protrusion 20, when pushing the corner | angular part seal part 15 into the installation groove | channel 13c, a pushing load will be reduced and it will be mounted | worn Work becomes easy.

  Further, in the vane type rotary actuator of the present embodiment, the corner seal portion 15 is attached to a portion corresponding to the corner portion 11e of the housing H which becomes a boundary between the inner surface of the housing portion 11 and the inner surfaces of the sealing blocks BL1 and BL2. Therefore, even when the vane 13 is rotated, a sufficient tightening margin of the seal member 14 is ensured with respect to the corner portion 11e of the housing H.

As described above, according to the present embodiment, the following effects can be achieved.
(1) In the corner seal portion 15 (seal member 14), even if the seal line is deviated from the seal line in the upright state, the tightening margin of the seal member 14 with respect to the housing H increases. For this reason, even if the sealing member 14 is tilted with the rotation operation of the vane 13 and the sealing line is deviated from the sealing line in the upright state, it is possible to secure a sufficient tightening allowance for the housing H. it can.

  Even if the seal line may deviate from the seal line in the upright state, by securing a sufficient tightening allowance for the housing H, the corner portion seal portion 15 (seal member 14) may move to the housing H. Sufficient resilience is also ensured. Therefore, the function of regulating the inflow and outflow of fluid between the housing H and the vane 13 can be enhanced.

  (2) The upright state of the seal member 14 can be easily maintained in the mounting groove 13c as compared with the case in which the protrusion 20 is not formed, and the housing H can be moved even when the vane 13 is rotated. Sufficient allowance for the sealing member 14 can be secured.

  However, depending on the relationship between the corner seal portion 15 including the protrusion 20 and the mounting groove 13c, the degree of maintenance of the upright state changes. In that respect, according to the above-described configuration in which the protrusion 20 is formed on the corner seal portion 15, the opening width of the mounting groove 13 c is changed without changing the dimensions and the like of the seal body such as the main body seal portion 16. Or, the degree of maintaining the upright state can be changed by changing the protrusion amount of the protrusion 20.

  (3) When the corner portion seal portion 15 is pushed into the attachment groove 13c and attached, it can be pushed along the inclination of the inclined surface 22 of the protrusion 20, so that the indentation load can be reduced and the attachment operation is easy. It will be able to be. Further, a force for maintaining an upright state can be applied to a portion of the corner seal portion 15 that is closer to the curved surface SS of the intersecting portion 19. Therefore, in addition to the improvement of the mounting operation, a sufficient tightening allowance can be ensured for the housing H even when the vane 13 is accompanied by a rotation operation.

  (4) By applying the corner seal portion 15 (seal member 14) to the vane-type rotary actuator, even when the seal line is deviated from the seal line in the upright state, the housing H particularly in the corner portion 11e of the housing H. The tightening allowance of the seal member 14 against H increases. Therefore, even if the seal member 14 is tilted with the rotation operation of the vane 13 and the seal line is deviated from the seal line in the upright state, the fluid between the corner portion 11e of the housing H and the vane 13 is particularly good. Inflows and outflows are effectively regulated.

  (5) Since the protrusion 20 has a cylindrical shape, it is possible to effectively disperse the indentation load and to erect the portion of the corner seal portion 15 closer to the curved surface SS of the intersecting portion 19. It is possible to effectively disperse and add the force for maintaining the power. Therefore, it is suppressed that force concentrates on one place of the corner | angular part seal part 15 and the vane 13, and it can contribute to the improvement of these durability.

In addition, embodiment mentioned above can also be implemented with the following forms which changed this suitably.
As shown in FIG. 6, the protrusions 20 may not be formed on the ribs 18. In this case, since there is no protrusion 20, it is assumed that an inclination centering on an intermediate position on the housing H side of the corner seal portion 15 and the bottom side of the mounting groove 13c on the reference line L occurs. For this reason, in this other example, on the reference line L, the starting point O is determined at an intermediate position on the reference line L between the housing H side of the corner seal portion 15 and the bottom side of the mounting groove 13c.

  The reference for determining the starting point O may be changed depending on the shape of the seal member, the specification of the actuator, etc. For example, even in the case of this embodiment, the housing H side and the mounting of the corner seal portion 15 on the reference line L The intermediate position may be set as the starting point O as long as the specification assumes that an inclination centered on the intermediate position on the bottom side of the groove 13c is generated.

The configuration of the rib 18 may be changed, for example, it may be formed only at a location corresponding to the corner seal portion 15.
The shape of the projection 20 can be reduced if the indentation load can be reduced or a force for maintaining an upright state can be applied to a portion closer to the curved surface SS of the intersecting portion 19 in the corner seal portion 15. For example, it may be formed in a prismatic shape.

  The protrusion 20 may be formed continuously along the rib 18. According to this, it is possible not only to maintain the erect state in the corner seal portion 15 but also to maintain the erect state of the entire seal member 14.

  -Even if the inclined surface 22 (thick portion 21) is not formed on the protrusion 20, it is sufficient if it can be fitted into the mounting groove 13c by press-fitting or the like. For example, a surface parallel to the rib 18 is formed. You may make it do.

The fluid is not limited to compressed air but may be other fluids such as a compressed liquid.
In the present embodiment, in the seal member 14, only the corner seal portion 15 corresponding to the corner portion 11 e of the housing H is improved, but the other main body seal portion 16 and the wing portion seal portion 17 are similarly improved. May be applied. For example, the rib 18 may be formed over the entire seal member 14, and the protrusion 20 may be formed over the entire seal member 14 in accordance with the rib 18.

  As shown in FIG. 7, in the actuator in which the cross section shown in FIG. 5 is formed in an annular shape (circular shape) so that the position of the moving body in the housing can be switched by supplying and discharging fluid such as compressed air. It can also be realized as an O-ring 30 typified by packing as a sealing member composed of a generally used elastic member such as rubber. In this other example, a curved surface SS in which a cross section acting as a seal surface forms an arc shape is formed on the outer periphery of the ring body 31 as a seal body of the O-ring 30 and a center line SL acting as a seal line is represented. The Further, O-ring ribs 32 corresponding to the ribs 18 are formed in the circumferential direction of both side surfaces of the ring body 31. In the circumferential direction of the O-ring rib 32, an O-ring protrusion 33 corresponding to the protrusion 20 and an O-ring thick part 34 corresponding to the thick part 21 are formed. In the O-ring protrusion 33, an O-ring inclined surface 35 corresponding to the inclined surface 22 is formed on the side facing the mounting groove 13c. Depending on the O-ring 30 of this another example, not only a vane type rotary actuator but also an application to a fluid pressure cylinder in which a rod-like cylinder reciprocates in the axial direction in a cylinder tube, and a housing and a moving body that are not actuators. It becomes possible to apply to the scene where the inflow and outflow of fluid between the two are regulated. In addition, this other example can also be applied to the other examples described above. For example, the cross section shown in FIG. 6 can be formed in a circular shape, or the O-ring protrusion 33 can be eliminated. You can also change the shape.

  In the above embodiment and other examples, the case where the seal line in the upright state passes through the center in the width direction of the curved surface SS is illustrated, but the seal line in the upright state is shifted from the center in the width direction of the curved surface SS. It can also be applied to the case of being biased (biased in any of the width directions).

Next, a technical idea that can be grasped from the above-described embodiment and another example (modification) will be additionally described below.
(A) The protrusions are formed discontinuously on the side of the seal body that faces the mounting groove, and the shape thereof is cylindrical.

  BL1, BL2 ... Sealing block, H ... Housing, L ... Base line, SL ... Center line, SS ... Curved surface, R1, R2, R3 ... Distance, Y ... Tangent, 10 ... Cylinder tube, 11 ... Housing, 11e ... Corner part, 13 ... Vane, 13c ... Mounting groove, 14 ... Seal member, 15 ... Corner seal part, 16 ... Main body seal part, 17 ... Wing part seal part, 19 ... Cross part, 20, 33 ... Projection part, 22 35 ... Inclined surface, 30 ... O-ring, 31 ... Ring body.

Claims (7)

A sealing member that is mounted in a mounting groove of a moving body that moves in the housing by supplying and discharging fluid to the housing, and that has an arc-shaped sealing surface that regulates inflow and outflow of fluid between the housing and the moving body In
The seal member includes a seal body formed with a width smaller than the opening width of the mounting groove,
A line that passes through a seal line formed on the seal surface in an upright state and intersects perpendicularly to a tangent to the seal surface is a reference line, and the seal body on the reference line is in the mounting groove. If the starting point when inclined to the distance the reference distance to the seal line, the sealing surface such that the distance from the origin to sealing position when said seal body is inclined is longer than the reference distance form The sealing member characterized by including the made cross-sectional shape. On opposite sides to a pair of side walls of the mounting groove before Symbol seal body includes a first projection projecting toward the one of the pair of side walls, toward the other of the pair of side walls The protruding second protrusion is formed continuously or discontinuously ,
2. The seal according to claim 1, wherein the starting point is determined at a position connecting the most protruding portion of the first protrusion and the most protruding portion of the second protrusion on the reference line. Element.   The seal member according to claim 2, wherein the protrusion is an inclined surface in which a surface facing the pair of side walls of the mounting groove increases in a protruding amount from the inner side to the outer side of the mounting groove. A cylindrical cylinder tube is provided with a housing in which both ends in the axial direction are sealed with sealing blocks. An output shaft is rotatably supported in the housing, and a vane is integrally attached to the output shaft. Vane type rotary actuator
In the mounting groove of the vane, a seal member on which an arc-shaped sealing surface that regulates inflow and outflow of fluid between the housing and the vane is formed is mounted,
The seal member includes a seal body formed with a width smaller than the opening width of the mounting groove,
The seal member passes through the seal line which stand upright is formed on the sealing surface, and, as a reference line a line which intersects perpendicularly to a tangent of the sealing surface, the seal body in said reference line If There was a distance reference distance from the origin to the seal line when inclined in the mounting groove, so that the distance from the origin to sealing position when said seal body is inclined is longer than the reference distance A vane-type rotary actuator comprising a cross-sectional shape on which the sealing surface is formed. The housing has a corner at a boundary between the cylinder tube and the sealing block;
A position corresponding to the angle before Symbol seal body, on opposite sides to a pair of side walls of the mounting groove of the seal body, first collision projecting toward the one of the pair of side walls And a second protrusion that protrudes toward the other of the pair of side walls, and the starting point is the most protruding part of the first protrusion on the reference line The vane-type rotary actuator according to claim 4, wherein the vane-type rotary actuator is defined at a position connecting the most protruding portion of the second protrusion .   The vane-type rotary actuator according to claim 5, wherein the projecting portion is a sloped surface in which a surface of the mounting groove facing the pair of side walls increases from the inner side to the outer side of the mounting groove.   A long blade portion and a short blade portion are formed in the vane so as to oppose each other in the radial direction of the output shaft, and the mounting groove has the seal member with respect to the housing when the vane rotates. The outer peripheral surface that is slid through, extends across the both axial end surfaces of the vane and the radial end surfaces of the long blade portion and the short blade portion,
  The seal body is fitted in a body seal portion fitted in the mounting grooves formed on both axial end surfaces of the vane, and in the mounting grooves formed on both radial end surfaces of the long blade portion and the short blade portion. A wing seal part
  When the portion where the main body seal portion and the wing seal portion intersect is defined as an intersection, the curve of the seal surface, which is a distance from the starting point, is formed so as to be gradually gentle toward the intersection. The vane type rotary actuator according to claim 5 or 6.