JP2014070640A - Rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary damper capable of reducing a frictional force at a shaft rotation time without deteriorating any sealability.SOLUTION: In order to solve the aforementioned problem, according to means for solving the problem of the invention, a rotary damper D comprises: a case 1; a shaft 5 inserted rotatably into the case 1; vanes 6 disposed on the outer circumference of the shaft 5 and defining the inside of the case 1 into one chamber R1 and the other chamber R2; a C-shaped seal groove 7 formed in the vanes 6; and a seal member 8 housed in the seal groove 7 and held in sliding contact with the case 1 for sealing the clearance between the vanes 6 and the case 1. The seal member 8 includes: a first rubber seal portion 81 for sliding contact with both one side panel 3 and a case body 2; a second rubber seal portion 82 for sliding to contact with both the other side panel 4 and the case body 2; and a leading-end resin seal portion 83 made of a fluororesin and arranged between the first rubber seal portion 81 and the second rubber seal portion 82 for sliding to contact with the case body 2.

Description

  The present invention relates to an improvement of a rotary damper.

  Conventional rotary dampers include a case having a cylindrical case body and a pair of side panels that close both ends of the case body, a shaft that is rotatably inserted into the case, and a shaft provided on the shaft. The vane divides the inside of the case into one chamber and the other chamber, a passage communicating the one chamber and the other chamber, and a damping valve provided in the middle of the passage.

  Then, for example, when a rotational force is applied to the shaft from the outside, the rotary damper operates to reduce the one chamber while the vane moves in the pressure chamber with the rotation of the shaft, and expands the other chamber. A damping force that suppresses the rotation of the shaft is exerted by applying resistance to the flow of oil moving from the one chamber to the other chamber with a damping valve.

  In the above rotary damper, the one chamber and the other chamber are separated by the vane, but by sealing the shaft vane and the case with a U-shaped sealing member, the one chamber and the other chamber are separated from each other except the passage. This prevents communication (see Patent Document 1).

JP-A-10-122287

  The sealing member described above may be made of rubber from the viewpoint of ensuring sealing performance. However, for the convenience of sealing around the vane, the contact length with the case is long and occurs between the case and the case when the shaft rotates. There is a problem that the frictional force is large and the smooth rotation of the shaft is hindered.

  In order to cope with the above problem, it is conceivable to use a low friction material for the seal member, but this time, the sealing performance is sacrificed and leakage occurs, and one chamber and the other chamber are located outside the passage. A new problem arises that it is difficult to communicate and to exert the damping force as intended.

  Accordingly, the present invention has been developed to improve the above-described problems, and an object of the present invention is to provide a rotary damper capable of reducing the frictional force during shaft rotation without impairing the sealing performance. It is to be.

  In order to solve the above-described problems, the problem-solving means of the present invention includes a case including a cylindrical case body and a pair of side panels that close both ends of the case body, and is rotatably inserted into the case. A shaft that is provided on an outer periphery of the shaft and that is in sliding contact with the case body and the side panels, and divides the case into one chamber and the other chamber, and faces the side panels of the vane. A U-shaped seal groove provided at the end in the axial direction and the tip opposite to the case body, and the vane and the case are accommodated in the seal groove and slidably contact the side panels and the case body. A rotary damper having a seal member for sealing between the first and second rubber seals that are slidably in contact with one of the side panels and the case main body. A second rubber seal portion that is in sliding contact with both the other side panel and the case body, and a fluororesin tip that is disposed between the first rubber seal portion and the second rubber seal portion and that is in sliding contact with the case body And a resin seal portion.

  In this rotary damper, when the shaft rotates and the vane moves relative to the case, the seal member comes into sliding contact with the inner periphery of the case, but the seal member reduces the frictional force with the case. Since the tip resin seal portion is provided, rotation of the shaft is not hindered. In addition, the first rubber seal portion is in close contact with the corner portion of the case body and the one side panel to seal between the case body and the one side panel and the bay 6, and the corner between the case body and the other side panel is sealed. Since the second rubber seal part is in close contact with the part and the case body and the other side panel and the vane are sealed, the one chamber and the other chamber are communicated between the seal member and the case. And high sealing performance can be secured.

  Therefore, according to the rotary damper of the present invention, it is possible to reduce the frictional force during shaft rotation without impairing the sealing performance.

It is a longitudinal cross-sectional view of the rotary damper in one embodiment. It is a cross-sectional view of the rotary damper in one embodiment. It is a longitudinal cross-sectional view of the sealing member of the rotary damper in one embodiment. It is a disassembled perspective view of the sealing member of the rotary damper in one embodiment. It is a perspective view of the sealing member of the rotary damper in one modification of one embodiment. It is a disassembled perspective view of the sealing member of the rotary damper in the other modification of one Embodiment. It is a disassembled perspective view of the sealing member of the rotary damper in another modification of one embodiment. It is a disassembled perspective view of the vane part of another rotary damper of one embodiment.

  The present invention will be described below based on the embodiments shown in the drawings. As shown in FIGS. 1 to 3, the rotary damper D in one embodiment is provided in a case 1, a shaft 5 that is rotatably inserted into the case 1, and an outer periphery of the shaft 5. Is divided into one chamber R 1 and the other chamber R 2, a seal groove 7 provided in the vane 6, and a seal member 8 that is accommodated in the seal groove 7 and seals between the vane 6 and the case 1. And is configured. The rotary damper D exhibits a damping force that suppresses the rotation of the shaft 5 when the shaft 5 is rotated in the circumferential direction with respect to the case 1.

  Hereinafter, each part of the rotary damper D will be described in detail. First, as will be described in detail later, the case 1 has a cylindrical case main body 2 and side panels 3 and 4 that are stacked on the left and right ends in FIG. A closed space is formed by the case body 2 and the side panels 3 and 4. The shaft 5 is rotatably supported by bearing caps 9 and 10 stacked on the side opposite to the case side of the side panels 3 and 4, and is rotatably inserted into the case 1. The vanes 6 and 6 provided on the outer periphery of the shaft 5 are accommodated in the case 1 and divide the inside of the case 1, that is, the space into one chamber R1 and the other chamber R2.

  The shaft 5 has a cylindrical shape with a hollow portion 5a inside, and is provided on the outer periphery of the tip, and is provided with a serration 5b that enables connection to a joint or the like (not shown), and has an outer diameter larger than that of the other portion. From a side portion between the vanes 6 and 6 of the enlarged diameter portion 5c, the pair of vanes 6 and 6 provided with a phase difference of 180 degrees in the circumferential direction on the outer circumference of the enlarged diameter portion 5c. Four through holes 5d, 5e, 5f, and 5g that open and communicate with the hollow portion 5a are provided. In addition, in the place mentioned above, although the serration 5b is provided for the coupling | bonding to the coupling etc. outside a figure, the connection method is not limited to this.

  A bottomed cylindrical cap 30 is screwed to the left end of the shaft 5 in FIG. The cap 30 closes the left end of the shaft 5 and includes a screw hole 30a penetrating the bottom. A valve 31 is screwed into the screw hole 30a. A sliding partition wall 32 is slidably inserted in the shaft 5, that is, in the hollow portion 5a. This sliding partition wall 32 defines an air chamber G in the hollow portion 5a on the left side in FIG. 1 relative to the sliding partition wall 32, and the hollow portion 5a is axial in the left and right direction in FIG. The volume of the air chamber G can be increased or decreased by moving in the direction. The gas chamber G can be filled with gas from the outside via the valve 31.

  Further, a damping valve V is accommodated on the right side in FIG. 1 from the sliding partition wall 32 of the hollow portion 5a in the shaft 5. The damping valve V is inserted into the hollow portion 5a, and a partition wall defining one side valve chamber A communicating with the one chamber R1 and the other side valve chamber B communicating with the other chamber R2 in the hollow portion 5a. The member 33, the one-side leaf valve 34 provided on the other-side valve chamber B side of the partition member 33, the other-side leaf valve 35 provided on the one-side valve chamber A side of the partition member 33, and a rod for integrating them 36.

  In addition, a partition member 37 that fits to the inner periphery of the hollow portion 5a is attached to the rod 36, and a holder member 38 for fixing the damping valve V to a predetermined position in the hollow portion 5a is attached. .

  A space on the left side in FIG. 1 with respect to the partition member 37 in the hollow portion 5 a is partitioned into a liquid chamber L and an air chamber G by the sliding partition wall 32. Further, a partition member 33 is disposed between the partition member 37 and the holder member 38, and the one-side valve chamber A and the other-side valve chamber B are defined by the partition member 33. In this case, the one-side valve chamber A is formed in the hollow portion 5 a by the partition member 37 and the partition member 33 between the partition member 37 and the partition member 33, and the partition member 33 is interposed between the partition member 33 and the holder member 38. The other side valve chamber B is formed in the hollow portion 5a by the holder member 38. The one-side valve chamber A communicates with the one chamber R1 through the through holes 5d and 5e. The other side valve chamber B communicates with the other chamber R2 through the through holes 5f and 5g. The partition member 37 is provided with an orifice hole 37a, and the one-side valve chamber A communicates with the liquid chamber L. As will be described in detail later, the one-side valve chamber A is connected to the one chamber R1 and the other side. It communicates with the other chamber R2 via the valve chamber B, and can compensate for volume changes due to temperature changes of the liquid in the one chamber R1 and the other chamber R2.

  The partition member 33 is annular and is mounted on the outer periphery of the rod 36, and includes a one-side port 33a and another-side port 33b communicating the one-side valve chamber A and the other-side valve chamber B. The one-side leaf valve 34 is mounted on the outer periphery of the rod 36 so as to open and close the right-side opening in FIG. 1 of the one-side port 33a, and the pressure in the one-side valve chamber A is changed to the other-side valve chamber B. When the pressure difference between the two reaches the valve opening pressure, it bends to open the one-side port 33a and allow the liquid to pass while giving resistance to the flow of the liquid. The other side leaf valve 35 is mounted on the outer periphery of the rod 36 so as to open and close the left end opening in FIG. 1 of the other side port 33b, and the pressure in the other side valve chamber B is changed to the one side valve chamber A. When the pressure difference between the two reaches the valve opening pressure, it bends to open the other port 33b and allow the liquid to flow while giving resistance to the flow of the liquid.

  The one-side leaf valve 34 and the other-side leaf valve 35 are both laminated leaf valves configured by laminating a plurality of annular plates, but the number of annular plates is arbitrary, and the rotary damper D Depending on the desired damping characteristics, it may be composed of only one annular plate. Further, instead of the one-side leaf valve 34 and the other-side leaf valve 35, for example, a valve body such as a poppet valve or a needle valve can be used, or a valve that does not require a valve body such as an orifice or a choke valve. It is good.

  The rod 36 has a cylindrical shape, is provided with a flange 36a at the proximal end, and is provided with a screw portion 36b on the outer periphery of the distal end. The partition member 37, the other side leaf valve 35, the partition wall member 33, the one side leaf valve 34, and the holder member 38 are assembled to the outer periphery of the rod 36, and the valve nut 39 is screwed to the screw portion 36 b at the tip of the rod 36. When worn, each member is assembled to the outer periphery of the rod 36 and is sandwiched between the flange 36a and the valve nut 39, and is integrated with the rod 36 and fixed.

  When the members constituting the damping valve V are fixed to the rod 36 and assembled as described above, the base end of the rod 36 is inserted from the right end side of the hollow portion 5a in FIG. 1 toward the inside of the hollow portion 5a. The left end of the holder member 38 in FIG. 1 is fixed to the shaft 5 by an outer peripheral screw nut 40 screwed to the inner periphery of the hollow portion 5a, so that the assembled component member of the damping valve V and the partition member 37 are assembled. It is fixed to the shaft 5.

  The case 1 is cylindrical and has a case body 2 that forms a working chamber R therein, a side panel 3 that closes the left end of the case body 2 in FIG. 1, and a side that closes the right end of the case body 2 in FIG. And a panel 4.

  The case main body 2 includes a plurality of screw holes 21 provided on the left end side in FIG. 1 and a plurality of screw holes 22 provided on the right end side of the case main body 2 in FIG. Further, the side panel 3 has a disc shape, and a shaft insertion allowing the insertion of a bolt insertion hole 3a provided at a position coinciding with the screw hole 21 provided in the case body 2 and the shaft 5 provided in the center. The side panel 4 is also formed in a disk shape, and a bolt insertion hole 4a provided at a position corresponding to the screw hole 22 provided in the case body 2 and a shaft 5 provided in the center. And a shaft insertion hole 4b that permits the insertion of.

  Further, a bearing cap 9 that rotatably supports the left side of the shaft 5 in FIG. 1 is laminated on the side opposite to the case side of the side panel 3 in FIG. A bearing cap 10 that rotatably supports the right side of the shaft 5 in FIG. 1 is laminated on the opposite case side.

  The bearing cap 9 has a cylindrical shaft insertion portion 9a, a flange portion 9b provided on the outer periphery of the shaft insertion portion 9a, and a position on the outer peripheral side of the flange portion 9b that matches the screw hole 21 of the case body 2. A bolt insertion hole 9c is provided, and an annular U packing 13 and an annular dust seal are provided on the inner periphery of the shaft insertion portion 9a so as to slide in contact with the left end side of the shaft 5 in FIG. 14 and a bush 15 that slides on the outer periphery of the shaft 5 and guides the rotation of the shaft 5 are mounted. On the other hand, the bearing cap 10 includes a bottomed cylindrical shaft insertion portion 10a, a flange portion 10b provided on the outer periphery of the shaft insertion portion 10a, and an outer peripheral side of the flange portion 10b in the screw hole 21 of the case body 2. A bolt insertion hole 10c provided at a matching position is provided, and an annular U-packing 16 is slidably brought into contact with the left end of the shaft 1 in FIG. And a bush 17 that is in sliding contact with the outer periphery of the shaft 5 and guides the rotation of the shaft 5.

  Then, the side panel 3 and the bearing cap 9 are stacked on the case main body 2 and the bolts 25 passed through the bolt insertion holes 3 a and 9 c are screwed into the screw holes 21, so that the side panel 3 and the bearing cap 9 are connected to the case main body 2. Integrated into Further, the side panel 4 and the bearing cap 10 are laminated on the case main body 2 and the bolts 26 passed through the bolt insertion holes 4 a and 10 c are screwed into the screw holes 22, so that the side panel 4 and the bearing cap 10 are connected to the case main body 2. Integrated into

  In the rotary damper D in this embodiment, the side panels 3 and 4 also have a function of slidingly contacting the vanes 6 and protecting the bearing caps 9 and 10, and from the viewpoint of wear resistance, the side panels The side surfaces of the vanes 3 and 4 may be made of a material having excellent wear resistance. Specifically, for example, the entire side panels 3 and 4 may be made of a material having high hardness, or the side panels 3 and 4 may be formed. The surface (sliding surface) that comes into contact with the vanes 6 is plated, a diamond-like carbon film is formed, and the surface is subjected to gas soft nitriding, heat treatment, and silicon attachment treatment to increase the surface wear resistance. You may make it do. Further, the case 1 may be configured by laminating the side caps 9 and 10 on the side panels 3 and 4 as separate components on the case body 2. In this case, since the aligning caps 9 and 10 are protected by the side panels 3 and 4, they are formed of a light material such as aluminum, thereby reducing the overall weight of the rotary damper D.

  When the side panels 3 and 4 and the bearing caps 9 and 10 are attached to the case body 2 as described above, the inside of the case body 2 is sealed, and two fan-shaped working chambers R are formed in the case 1. . The tip of the vane 6 provided on the shaft 5 is in sliding contact with the inner periphery of the case main body 2 in the case 1, and the two working chambers R are divided into the room C1 and the room C2 by the vane 6, respectively. For example, liquid such as hydraulic oil is enclosed. In addition, O-rings 27 and 28 that surround the outer periphery of the working chamber R are attached to the left and right ends of the case body 2 of the case 1 in FIG. 1 so that the space between the case body 2 and the side panels 3 and 4 is sealed. The working chamber R is sealed.

  In FIG. 2, the room C1 is defined on the left side of the vane 6 when viewed from the axis of the shaft 1, and the room C2 is defined on the right side of the vane 6 when viewed from the axis of the shaft 5. The shaft 5 is illustrated in FIG. When the shaft 5 is rotated clockwise, each room C1 is enlarged and each room C2 is reduced by the vane 6. On the contrary, when the shaft 5 is rotated counterclockwise in FIG. Is reduced and each room C2 is enlarged.

  Then, the chambers C1 whose volumes are both expanded or reduced with the rotation of the shaft 5 are communicated with each other via the through holes 5d and 5e of the shaft 5 and the one-side valve chamber A to form one chamber R1. The chambers C2 whose volumes are both expanded or reduced with the rotation of the shaft 5 are communicated with each other via the through holes 5f and 5g of the shaft 5 and the other-side valve chamber B, thereby forming the other chamber R2. The one chamber R1 and the other chamber R2 are partitioned by the vane 6 as can be understood from the above description. Further, the opening positions of the through holes 5d, 5e, 5f, and 5g are provided at the root of the vane 6 so that the one chamber R1 is maintained in communication with the through holes 5d and 5e even when the shaft 5 rotates. The opening positions of the holes 5f and 5g are also provided at the root of the vane 6 so that the other chamber R2 is maintained in communication with the communication holes 5f and 5g even when the shaft 5 rotates.

  In this embodiment, each vane 6 is provided so as to protrude in the radial direction from the shaft 5, and a tip 6 a facing the inner periphery of the case body 2 has an arc shape, and is provided at this tip 6 a. A tip groove 7a provided along the shaft axis and an axial end (end viewed from the axial direction of the shaft 5) facing the one side panel 3 in the radial direction of the shaft 5 at the left end 6b in FIG. 1 along the radial direction of the shaft 5 to the right end 6c in FIG. 1 which is an end groove 7b provided along the axis and an axial end (end viewed from the axial direction of the shaft 5) facing the other side panel 4. The provided end groove 7c is provided. The tip groove 7 a and the end grooves 7 b and 7 c are connected to each other adjacently to form one U-shaped seal groove 7. Therefore, each vane 6 includes the seal groove 7.

  In the seal groove 7, a seal member 8 is accommodated which is in sliding contact with the side panels 3 and 4 and the case body 2 and seals between the vane 6 and the case 1. As shown in FIGS. 3 and 4, the seal member 8 includes a first rubber seal portion 81 slidably contacting both the one side panel 3 and the case body 2, and both the other side panel 4 and the case body 2. A second rubber seal portion 82 that is in sliding contact with the first rubber seal portion 81, a front end resin seal portion 83 that is disposed between the first rubber seal portion 81 and the second rubber seal portion 82 and that is in sliding contact with the case body 2, and one side panel 3. One side resin seal portion 84 made of fluororesin that slidably contacts only, the other side resin seal portion 85 made of fluororesin that slidably contacts only the other side panel 4, and a core inserted into the deepest portion of the seal groove 7. It has a letter shape and is configured to include a rubber backup portion 86.

  As shown in FIG. 3, the first rubber seal portion 81 has an L shape, is accommodated in the corners of the tip groove 7 a and the end groove 7 b, is made of rubber, and has one side panel 3. Both sides of the case body 2 are in sliding contact with each other, and since it is excellent in elasticity, it can be in close contact with the corners of these boundaries, and the side panel 3 and the case body 2 are both tightly sealed with the vanes 6. Can do. Further, concave portions 81 a and 81 b are provided at both ends of the first rubber seal portion 81.

  As shown in FIG. 3, the second rubber seal portion 82 is also L-shaped, and is accommodated in the corners of the tip groove 7 a and the end groove 7 b, and is made of rubber. It is in sliding contact with both the case body 2 and has excellent elasticity so that it can be in close contact with the corners of these boundaries, and the side panel 4 and the case body 2 and the vane 6 are both tightly sealed. Can do. In addition, concave portions 82 a and 82 b are provided at both ends of the second rubber seal portion 82.

  The tip resin seal portion 83 is made of fluororesin and has a high self-lubricating property. Therefore, even if the tip resin seal portion 83 is in sliding contact with the inner periphery of the case body 2, the frictional force generated between the case body 2 and the case body 2 is reduced. While the gap between 2 and the vane 6 is sealed, the swinging of the vane 6 is not disturbed. The tip resin seal portion 83 is accommodated in the tip groove 7a of the seal groove 7, and has convex portions 83a and 83b at both ends. The first resin seal portion 83 is fitted into the concave portion 81a of the first rubber seal portion 81 by fitting the convex portion 83a. The second rubber seal portion 81 is connected to the second rubber seal portion 82 by fitting the convex portion 83b into the concave portion 82a of the second rubber seal portion 82. Therefore, there is no gap between the joint between the tip resin seal portion 83 and the first rubber seal portion 81 and the joint between the tip resin seal portion 83 and the second rubber seal portion 82, and the joint between the tip resin seal portion 83 and the first rubber seal portion 81. The one chamber R1 and the other chamber R2 are not communicated with each other at the joint between the eye and the tip resin seal portion 83 and the second rubber seal portion 82. A concave portion may be provided on the front end resin seal portion 83 side, and a convex portion may be provided and fitted to the first rubber seal portion 81 and the second rubber seal portion 82. Moreover, the shape of convex part 83a, 83b and recessed part 81a, 82a should just be a shape which can mutually be fitted, and the number of convex parts and recessed parts can also be set arbitrarily.

  The one side resin seal portion 84 is made of fluororesin and has a high self-lubricating property, so that the frictional force generated between the one side panel 3 and the side panel 3 is small even when sliding on the inner periphery of the one side panel 3. Thus, while the gap between the side panel 3 and the vane 6 is sealed, the swinging of the vane 6 is not disturbed. The one side resin seal portion 84 is accommodated in the end groove 7b of the seal groove 7 and has a convex portion 84a at the first rubber sheave side end. The concave portion 81b of the first rubber seal portion 81 is fitted into the convex portion 84a. By joining, it connects with the 1st rubber seal part 81, and the one chamber R1 and the other chamber R2 are not connected by the joint with the 1st rubber seal part 81. A recess may be provided in the one side resin seal portion 84, and a protrusion may be provided in the first rubber seal portion 81 for fitting. Moreover, the shape of the convex part 84a and the recessed part 81b should just be a shape which can mutually be fitted.

  Since the other side resin seal portion 85 is made of a fluororesin and is rich in self-lubricating property, the frictional force generated between the other side panel 4 and the side panel 4 is small even when sliding on the inner periphery of the other side panel 4. Thus, while the gap between the side panel 4 and the vane 6 is sealed, the swinging of the vane 6 is not disturbed. The other side resin seal portion 85 is accommodated in the end groove 7c of the seal groove 7, has a convex portion 85a at the second rubber sheave side end, and fits into the convex portion 85a in the concave portion 82b of the second rubber seal portion 82. By combining, the second rubber seal portion 82 is connected, and the one chamber R1 and the other chamber R2 are not communicated with each other at the joint with the second rubber seal portion 82. A recess may be provided in the other side resin seal portion 85, and a protrusion may be provided in the second rubber seal portion 82 for fitting. Moreover, the shape of the convex part 85a and the recessed part 82b should just be a shape which can mutually be fitted, and the number of a convex part and a recessed part can also be set arbitrarily.

  The backup portion 86 is made of rubber, and has a central portion 86a accommodated in the leading end groove 7a of the seal groove 7, and end portions 86b accommodated in the end groove 7b and 7c connected to both ends of the central portion 86a. 86c and is formed in a U-shape, and the first rubber seal portion 81 and the second rubber seal are respectively provided at the boundary between the central portion 86a and the end portion 86b and the boundary portion between the central portion 86a and the end portion 86c. The part 82 is provided integrally. The front end resin seal portion 83 is laminated between the first rubber seal portion 81 and the second rubber seal portion 82 of the backup portion 86, that is, the central portion 86a, and the one side resin seal portion is disposed at the end portion 86b of the backup portion 86. 84, and the other side resin seal portion 85 is laminated on the end portion 86c of the backup portion 86.

  Therefore, the backup portion 86 has a function of holding the first rubber seal portion 81 and the second rubber seal portion 82, and presses the tip resin seal portion 83 toward the case body 2 so that the one side resin seal portion 84 is pushed to one side panel. 3, and the urging function of pressing the other side resin seal portion 85 toward the other side panel 4. Therefore, by providing the backup portion 86, the tip resin seal portion 83 formed of fluororesin is in close contact with the case body 2, the one side resin seal portion 84 is in close contact with one side panel 3, and the other side side The resin seal portion 85 is in close contact with the other side panel 4 and can effectively seal between the vane 6 and the case 1. Although the backup portion 86 has the effect of improving the sealing performance of the seal member 8 in this way, the first rubber seal portion 81, the second rubber seal portion 82, the tip resin seal portion 83, the one side resin seal portion 84, and If the other side resin seal portion 85 is fitted and integrated as described above, the backup portion 86 can be omitted.

  Further, in order to reduce the sliding friction between the one side panel 3 and the other side panel 4 and the seal member 8, the one side resin seal portion 84 and the other side resin seal portion 85 are provided. If the magnitude of the sliding friction in the part 81 and the second rubber seal part 82 does not matter, one side resin seal as in the seal member 8 of another modification of the rotary damper D shown in FIG. The part 84 and the other side resin seal part 85 are abolished, the first rubber seal part 81 is extended and accommodated over the entire length of the end groove 7b, and a seal between the one side panel 3 and the vane 6 is provided. Only the first rubber seal portion 81 is used, the second rubber seal portion 82 is extended and accommodated over the entire length of the end groove 7c, and the seal between the other side panel 4 and the vane 6 is sealed. It is also possible to perform only two rubber seal portion 82.

  Further, like the seal member 8 of another modification of the rotary damper D shown in FIG. 6, the rubber-made one end rubber seal portion on the side opposite to the first rubber seal portion of the one side resin seal portion 84. 87, and the other side end rubber seal portion 88 may be provided on the side opposite to the second rubber seal portion of the other side resin seal portion 85. In this case, if the backup portion 86 is provided, the one end rubber seal portion 87 and the other end rubber seal portion 88 may be integrated with the backup portion 86. Further, a concave portion 87a is provided in the one side end rubber seal portion 87, and a convex portion 84b is provided in the one side resin seal portion 84 so that they are fitted to each other so that no gap is formed at the joint between them. If the rubber seal portion 88 is provided with a concave portion 88a and the other side resin seal portion 85 is provided with a convex portion 85b so that a gap is not formed at the joint between the two, the sealing performance is improved. The one side resin seal portion 84 and the other side resin seal portion 85 may be provided with a recess, and the one side end rubber seal portion 87 and the other side end rubber seal portion 88 may be provided with a protrusion, or The shape of the concave portion may be any shape that can be fitted to each other, and the number of convex portions and concave portions can be arbitrarily set.

  Furthermore, as in the seal member 8 of another modification of the rotary damper D shown in FIG. 7, a convex portion 83 c is provided at the backup portion side end of the tip resin seal portion 83, and the tip resin seal portion of the backup portion 86 is provided. A concave portion 86d is provided at the side end, that is, the end resin seal side end of the central portion 86a, and the both are fitted so that no gap is formed between the backup portion 86 and the tip resin seal portion 83. The sealing performance may be improved. Conversely, a recess may be provided at the backup resin side end of the tip resin seal portion 83, and a protrusion may be provided at the tip resin seal portion side end of the backup portion 86. Similarly, although not shown, one of the convex portion and the concave portion is provided at the backup portion side end of the one side resin seal portion 84 and the other side resin seal portion 85, and the one side resin seal portion side end of the backup portion 86 is provided. Alternatively, the other side resin seal part side end may be provided with the other of the convex part and the concave part and fitted. In addition, the shape of a convex part and a recessed part should just be able to fit, and the number of installation can be set arbitrarily.

  In addition, as shown in still another modification of the rotary damper D shown in FIG. 8, the U-shaped backup plates 19 and 19 may be accommodated in the seal groove 7 together with the seal member 8. In this case, since the seal member 8 is sandwiched from both sides by the backup plates 19, 19, the tip resin seal portion 83, the one side resin seal portion 84, and the other side resin seal portion 85 are dropped from the seal groove 7. This can be prevented.

  Returning, a U-shaped seal 29 is attached to the inner periphery of the case main body 2 of the case 1 and the portion that is in sliding contact with the outer periphery of the enlarged diameter portion 5 c of the shaft 5 and the left and right ends of the case main body 2. Further, a side seal 11 is provided on the inner periphery of the side panel 3 so as to be in sliding contact with both the inner wall of the shaft insertion hole 3b and the enlarged diameter portion 5c of the shaft 5 to seal between the side panel 3 and the shaft 5. Further, on the inner periphery of the side panel 4, a side seal 12 is slidably brought into contact with both the inner wall of the shaft insertion hole 4 b and the enlarged diameter portion 5 c of the shaft 5 to seal between the side panel 4 and the shaft 5. Is provided.

  The one chamber R1 and the other chamber R2 are not communicated with each other without the damping valve V by the seal 29, the seal member 8 provided on the vane 6, the side seals 11 and 12, and the O-rings 27 and 28. It is sealed.

  Next, the operation of the rotary damper D configured as described above will be described. When the shaft 5 rotates counterclockwise in FIG. 2 and the vane 6 compresses the one chamber R1, the pressure in the one chamber R1 rises and the one side leaf valve 34 is bent to open the one side port 33a. The liquid pushed out from the one chamber R1 flows into the other chamber R2 via the one side valve chamber A, the one side port 33a, and the other side valve chamber B. When the liquid passes through the one-side port 33a, the one-side leaf valve 34 gives resistance to the flow of the liquid, thereby generating a differential pressure between the pressures in the one chamber R1 and the other chamber R2, thereby rotating the rotary damper D. Exhibits a damping force that suppresses the rotation of the shaft 5. On the contrary, when the shaft 5 rotates clockwise in FIG. 2 and the vane 6 compresses the other chamber R2, the pressure in the other chamber R2 rises, the other leaf valve 35 is bent and the other port 33b is opened. Therefore, the liquid pushed out from the other chamber R2 flows into the one chamber R1 through the other side valve chamber B, the other side port 33b, and the one side valve chamber A. When the liquid passes through the other side port 33b, the other leaf valve 35 gives resistance to the flow of the liquid, thereby causing a differential pressure between the pressures of the other chamber R2 and the one chamber R1, thereby rotating the rotary damper D. Exhibits a damping force that suppresses the rotation of the shaft 5.

  Further, when the volume of the liquid changes due to the temperature change of the liquid in the rotary damper D, the sliding partition wall 32 moves in the axial direction in the hollow portion 5a to increase or decrease the volume of the air chamber G. In this case, the compensating means includes a sliding partition wall 32 slidably inserted into the hollow portion 5a, and an air chamber G and a liquid defined by the sliding partition wall 32. Chamber L. More specifically, when the volume change of the liquid occurs, because the volume changes in the one chamber R1, the other chamber R2, the one side valve chamber A and the other side valve chamber B, the liquid becomes excessive or insufficient. When the sliding partition wall 32 moves in the hollow portion 1a in accordance with the volume change, when the liquid becomes excessive, the excess liquid is in the one chamber R1, the other chamber R2, the one side valve chamber A, and the other side valve chamber. When the liquid is discharged from B to the liquid chamber L and the liquid is insufficient, the insufficient liquid is supplied from the liquid chamber L to the one chamber R1, the other chamber R2, the one side valve chamber A, and the other side valve chamber B. become. In addition, since the pressure in the air chamber G propagates to the one chamber R1, the other chamber R2, the one side valve chamber A, and the other side valve chamber B through the liquid chamber L, the pressure in the air chamber G is increased. Thus, the apparent rigidity of the liquid is increased, and the rotary damper D can exhibit a damping force with high responsiveness.

  In the rotary damper D, when the shaft 5 rotates and the vane 6 moves relative to the case 1, the seal member 8 comes into sliding contact with the inner periphery of the case 1. Since the front end resin seal portion 83 that reduces the frictional force with the case 1 is provided, the rotation of the shaft 5 is not hindered. Further, a first rubber seal portion 81 is in close contact with a corner portion of the case body 2 and the one side panel 3 to seal between the case body 2 and the one side panel 3 and the vane 6. Since the second rubber seal portion 82 is in close contact with the corner portion of the side panel 4 and the case body 2 and the other side panel 4 and the vane 6 are sealed, the one chamber R1 and the other chamber R2 are sealed. There is no communication between the member 8 and the case 1, and high sealing performance can be ensured. Therefore, according to the rotary damper D of the present invention, the frictional force during the shaft rotation can be reduced without impairing the sealing performance.

  Further, by providing the one side resin seal portion 84 and the other side resin seal portion 85, the contact lengths of the first rubber seal portion 81 and the second rubber seal portion 82 to the case 1 can be reduced, and further friction can be achieved. The force can be reduced, and a smoother rotational movement of the shaft 5 can be ensured.

  In addition, although the structure which provides the damping valve V in the shaft 5 is employ | adopted as mentioned above, it is not limited to this. Also, the number of vanes 6 installed is not particularly limited to the number of installations described above.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

DESCRIPTION OF SYMBOLS 1 Case 2 Case main body 3, 4 Side panel 5 Shaft 6 Vane 7 Seal groove 8 Seal member 81 1st rubber seal part 81a, 81b Recessed part 82 in 1st rubber seal part 2nd rubber seal part 82a, 82b Recessed part 83 in 2nd rubber seal part Tip Resin seal portions 83a, 83b Convex portion 84 at tip resin seal portion One side resin seal portion 84a Convex portion 85 at one side resin seal portion Other side resin seal portion 85a Convex portion 86 at other side resin seal portion Backup portion 86d Concave part 87 in backup part One end side rubber seal part 88 The other end side rubber seal part D Rotary damper R1 One chamber R2 The other chamber

Claims (8)

A case having a cylindrical case body and a pair of side panels that close both ends of the case body, a shaft that is rotatably inserted into the case, an outer periphery of the shaft, and the case body and the case A vane that slidably contacts each side panel and divides the inside of the case into one chamber and the other chamber, an axial end that faces each side panel of the vane, and a tip that faces the case body A rotary damper having a seal groove and a seal member that is housed in the seal groove and that is slidably contacted with the side panels and the case main body to seal between the vane and the case. Is in contact with both the first side panel and the case body, and is in sliding contact with the other side panel and the case body. Rotary damper, characterized in that it comprises a second rubber seal portion, and a said first rubber seal portion and the sliding contact fluoroplastic tip seal resin portion disposed in the case body between the second rubber seal portion. The sealing member includes a fluororesin one side resin seal portion that is in sliding contact with only one side panel, and a fluororesin other side resin seal portion that is in sliding contact with only the other side panel. The rotary damper according to claim 1. The seal member has one end side rubber seal portion adjacent to one side panel adjacent to one side resin seal portion at one end and the other side panel adjacent to the other side resin seal portion at the other end. The rotary damper according to claim 2, further comprising a rubber seal portion on the other end side. The seal member has a U-shaped and rubber backup portion inserted into the seal groove, the first rubber seal portion and the second rubber seal portion are provided in the backup portion, and the tip resin seal portion is The rotary damper according to claim 1, wherein the rotary damper is stacked on the backup unit. The rotary damper according to claim 4, wherein the one side resin seal portion and the other side resin seal portion are stacked on the backup portion. Concave portions or convex portions are provided at both ends of the tip resin seal portion, convex portions or concave portions are provided at an end portion of the first rubber seal portion and an end portion of the second rubber seal portion, and both ends of the tip resin seal portion are first. The rotary damper according to any one of claims 1 to 5, wherein the rotary damper is fitted to an end portion of a rubber seal portion and an end portion of the second rubber seal portion. A concave portion or a convex portion is provided at an end portion of the one side resin seal portion, a convex portion or a concave portion is provided at an end portion of the first rubber seal portion, and an end portion of the one side resin seal portion is the first rubber seal portion. Is provided at the end of the other side resin seal portion, provided with a recess or projection at the end of the second side resin seal portion, provided with a projection or recess at the end of the second rubber seal portion, The rotary damper according to any one of claims 2 to 6, wherein an end portion is fitted to an end portion of the second rubber seal portion. A recess or projection is provided on the backup resin side end of the tip resin seal part, a projection or recess is provided on the tip resin seal part side end of the backup part, and the tip resin seal part is fitted to the backup part, A concave portion or a convex portion is provided at the end of the backup portion side of the one side resin seal portion, a convex portion or a concave portion is provided at the end of the one side resin seal portion of the backup portion, and the one side resin seal portion is the backup portion. Is provided with a concave portion or a convex portion at the backup portion side end of the other side resin seal portion, and a convex portion or a concave portion is provided at the other side resin seal portion side end of the backup portion. The rotary damper according to claim 5, wherein a resin seal portion is fitted to the backup portion.

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