JP2014070642A - Rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary damper capable of sufficiently enduring even a transverse force input to a shaft without inviting a size enlargement and a weight increase.SOLUTION: In order to provide means for solving a problem, a rotary damper D comprises: a shaft 1; a case 2 formed in an annular shape and having an operation chamber R therein; a pair of side plates 2 and 3 closing the two axial sides of the case 2 and having the shaft 1 rotatably inserted thereinto; and vanes 5 disposed on the shaft 1 and held at its leading ends in sliding contact with the inner circumference of the case 2 and with the individual side plates 2 and 3 for defining the operation chamber R into one chamber R1 and the other chamber R2. Partially or wholly of the vane sliding faces of the side plates 2 and 3, there are formed positioning faces 3c and 4c for sliding contact with the vanes 5 for positioning the shaft 1 in a radial direction.

Description

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

  Conventionally, in a rotary damper, a shaft, a pair of side panels that pivotally support the shaft while allowing rotation in the circumferential direction, and a case that is sandwiched between these side panels to form a working chamber inside. The vane is provided on the shaft and divides the working chamber into one chamber and the other chamber.

  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 working chamber as the shaft rotates, and to reduce the other chamber. A damping force that suppresses the rotation of the shaft is exhibited by applying resistance to the flow of oil moving from the one chamber to the other chamber with a damping valve (see Patent Document 1).

JP-A-8-14301

  In order to guide the rotation of the shaft, such a rotary damper is provided with a cylindrical bush on the inner periphery of the side panel, and the shaft is rotatably supported by this bush.

  When external force (hereinafter referred to as lateral force) in the lateral direction (direction orthogonal to the axial direction) acts on the shaft, this lateral force will be received by the bush. However, in order to ensure smooth rotation of the shaft, When formed with copper having good slidability, there is a problem that when the allowable surface pressure is small and the lateral force is large, it is deformed or wear easily occurs.

  To solve this problem, it is necessary to increase the contact area between the shaft and the bush by increasing the length of the bush, increasing the diameter, or both, but this increases the size of the rotary damper. In addition to deterioration in mountability on a vibration-controlled object such as a vehicle, a new problem of increasing weight arises.

  Accordingly, the present invention has been developed to improve the above-described problems, and the object of the present invention is to sufficiently withstand lateral force input to the shaft without causing an increase in size and weight. It is to provide a rotary damper that can.

  In order to solve the above-described problems, the problem-solving means of the present invention includes a shaft, a case that is annular and provided with a working chamber inside, and that both sides of the case in the axial direction are closed and the shaft is rotatable. A pair of side plates to be inserted, and a vane provided on the shaft and having a tip slidably contacting the inner periphery of the case and slidably contacting each side plate to partition the working chamber into one chamber and the other chamber. In the rotary damper provided, a part or all of the vane sliding surface of the side plate is provided with a positioning surface that slides on the vane and positions the shaft in the radial direction.

  As described above, this rotary damper exhibits a damping force that suppresses the rotation of the shaft as the shaft rotates, but a damping valve that provides resistance to the flow of liquid flowing between the one chamber and the other chamber. Since it is provided in the shaft, it is not necessary to provide a damping valve on the side of the case or in a place where the swingable range of the shaft is pressed.

  Therefore, according to the rotary damper of the present invention, it is possible to reduce the size and weight of the rotary damper.

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 side view of the shaft of the rotary damper in one embodiment. It is a top view of the side plate of the rotary damper in one embodiment.

  The present invention will be described below based on the embodiments shown in the drawings. As shown in FIGS. 1 to 3, a rotary damper D according to an embodiment includes a shaft 1, a case 2 that is annular and provided with working chambers inside, a shaft 2 that is closed on both sides in the axial direction, and the shaft 2. A pair of side plates 3 and 4 through which a shaft 1 is rotatably inserted, and a working chamber R provided in the shaft 1 and having a tip slidably contacting the inner periphery of the case 2 and slidably contacting each side plate 3 and 4. The vanes 5 and 5 are divided into R1 and the other chamber R2. The rotary damper D exhibits a damping force that suppresses the rotation of the shaft 1 when the shaft 1 is rotated in the circumferential direction with respect to the case 2.

  Hereinafter, each part of the rotary damper D will be described in detail. First, the shaft 1 is formed into a cylindrical shape having a hollow portion 1a therein, and is provided on the outer periphery of the tip to enable connection to a joint or the like (not shown), and the outer diameter is larger than that of the other portion. The enlarged diameter portion 1c, a pair of vanes 5 and 5 provided on the outer periphery of the enlarged diameter portion 1c with a phase difference of 180 degrees in the circumferential direction, and the side between the vanes 5 and 5 of the enlarged diameter portion 1c. There are four through holes 1d, 1e, 1f, and 1g that open from the portion and communicate with the hollow portion 1a. In addition, in the place mentioned above, although the serration 1b 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 1 in FIG. The cap 30 closes the left end of the shaft 1 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 into the shaft 1, that is, in the hollow portion 1a. The sliding partition wall 32 defines an air chamber G in the hollow portion 1a on the left side in FIG. 1 with respect to the sliding partition wall 32, and the left and right sides 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 1a in the shaft 1. The damping valve V is inserted into the hollow portion 1a, 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 1a. 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 1a 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 1a is attached. .

  A space on the left side in FIG. 1 with respect to the partition member 37 in the hollow portion 1 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 1 a 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 1 a by the holder member 38. The one-side valve chamber A communicates with the one chamber R1 through the through holes 1d and 1e. The other side valve chamber B communicates with the other chamber R2 through the through holes 1f and 1g. 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 in FIG. 1 of the hollow portion 1a toward the inside of the hollow portion 1a. 1, the left end of the holder member 38 in FIG. 1 is fixed to the shaft 1 by an outer peripheral screw nut 40 that is screwed to the inner periphery of the hollow portion 1a, whereby the assembled component member of the damping valve V and the partition member 37 are assembled. Fixed to the shaft 1.

  The case 2 is cylindrical and has a main body 20 that forms a working chamber R therein, a plurality of screw holes 21 provided on the left end side of the main body 20 in FIG. 1, and a right end side of the main body 20 in FIG. A plurality of screw holes 22 are provided.

  A side plate 3 and a side panel 6 are sequentially stacked on the left side of the case 2 in FIG. 1, and a side plate 4 and a side panel 7 are sequentially stacked on the right side of the case 2 in FIG. Has been.

  The side plate 3 and the side panel 6 are provided with bolt insertion holes 3a and 6a provided at positions corresponding to the screw holes 21 provided in the case 2, and bolts 25 passed through these bolt insertion holes 3a and 6a are screwed. The side plate 3 and the side panel 6 are integrated with the case 2 by being screwed into the hole 21. Similarly, the side plate 4 and the side panel 7 are provided with bolt insertion holes 4a and 7a provided at positions corresponding to the screw holes 22 provided in the case 2, and bolts passed through these bolt insertion holes 4a and 7a. The side plate 4 and the side panel 7 are integrated with the case 2 by screwing 26 into the screw hole 22.

  The side plates 3 and 4 have a disc shape, and allow a plurality of bolt insertion holes 3 a and 4 a provided at positions corresponding to the screw holes 21 and 22 of the case 2 and the shaft 1 to be inserted at the center. The shaft insertion holes 3b and 4b and positioning surfaces 3c and 4c made of tapered surfaces provided on the side surfaces of the case are provided. The positioning surfaces 3c and 4c are provided only on the surface of the side plates 3 and 4 facing the working chamber R, and the surface (matching surface) on which the side plates 3 and 4 abut the body 20 of the case 2 is the case 2 Consideration is made so as to follow the main body 20.

  In this case, the positioning surfaces 3a and 4a are tapered surfaces formed by inclined surfaces in which the inner peripheral side of the side plates 3 and 4 is thin and the outer peripheral side is thick. That is, the positioning surfaces 3a and 4a are inclined surfaces in which the axial lengths (thicknesses) of the inner circumferences of the side plates 3 and 4 are short and the axial lengths of the outer circumferences are long.

  In the rotary damper D in this embodiment, the side plates 3 and 4 serve to protect the side panels 6 and 7 by slidingly contacting the vanes 5. From the viewpoint of wear resistance, the side plates 3 and 4 The side surfaces of the vanes 4 may be made of a material having excellent wear resistance. Specifically, for example, the side plates 3 and 4 are made of a material having a relatively high hardness such as iron or stainless steel.

  The side panel 6 is provided with a bolt insertion hole 6a which is annular and is provided on the outer peripheral side at a position coinciding with the screw hole 21 of the case 2, and is slidably contacted with the left end side of the shaft 1 in FIG. An annular U-packing 13 and an annular dust seal 14 for sealing the outer periphery of the shaft 1 are respectively mounted. On the other hand, the side panel 7 has a disc shape and includes a bolt insertion hole 7a provided at a position coinciding with the screw hole 22 of the case 2 on the outer peripheral side, and the left end of the shaft 1 in FIG. An annular U-packing 15 that is slidably contacted on the side and seals the outer periphery of the shaft 1 is mounted. Since these side panels 6 and 7 are protected by the side plates 3 and 4, the side panels 6 and 7 are made of a lightweight material such as aluminum, for example, thereby reducing the overall weight of the rotary damper D.

  When the side plates 2 and 3 and the side panels 6 and 7 are attached to the case 2 as described above while the shaft 1 is inserted into the case 2, the inside of the case 2 is hermetically sealed and has two fan-like working chambers R. Form. Further, the tip of the vane 5 provided on the shaft 1 is in sliding contact with the inner periphery of the main body 20 in the case 2, and the two working chambers R are partitioned into a room C1 and a room C2 by the vane 5, respectively. Liquid such as hydraulic oil is enclosed. In addition, O-rings 27 and 28 surrounding the outer periphery of the working chamber R are attached to the left and right ends of the main body 20 of the case 2 in FIG. 1, and the space between the case 2 and the side plates 3 and 4 is sealed to operate. Chamber R is sealed.

  In FIG. 2, the room C1 is partitioned on the left side of the vane 5 when viewed from the axis of the shaft 1, and the room C2 is partitioned on the right side of the vane 5 when viewed from the axis of the shaft 1. When the shaft 1 rotates clockwise, each room C1 is enlarged and each room C2 is reduced, and conversely, when the shaft 1 rotates 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 1 are communicated with each other via the through holes 1d and 1e of the shaft 1 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 1 are communicated with each other via the through holes 1f and 1g of the shaft 1 and the other side valve chamber B, and these are defined as the other chamber R2. The one chamber R1 and the other chamber R2 are partitioned by the vane 5 as can be understood from the above description. Further, the opening positions of the through holes 1d, 1e, 1f, and 1g are provided at the roots of the vanes 5 so that the one chamber R1 is maintained in communication with the through holes 1d and 1e even when the shaft 1 rotates. The opening positions of the holes 1f and 1g are also provided at the root of the vane 5 so that the other chamber R2 is maintained in communication with the communication holes 1f and 1g even when the shaft 1 rotates.

  In this embodiment, the vane 5 has an arcuate surface at the tip, and as shown in FIG. 3, the end surface 5a at the left end in FIG. 3 and the end surface 5b at the right end in FIG. The inclined surfaces follow the positioning surfaces 3c and 4c so as to be in sliding contact with the positioning surfaces 3c and 4c of the side plates 3 and 4, respectively. In this case, when the vane 5 is accommodated in the working chamber R, all of the slidable contact surfaces that are in the range where the end surfaces 5a, 5b of the vane 5 of the side plates 3, 4 are in slidable contact form the positioning surfaces 3c, 4c. . That is, when the shaft 1 is rotated clockwise and counterclockwise with respect to the case 2 until the rotation is restricted, the vane 5 is a surface that may come into sliding contact with the side plates 3 and 4. All are the positioning surfaces 3c and 4c.

  Therefore, when both end surfaces 5a and 5b of the vane 5 come into contact with the positioning surfaces 3c and 4c of the side plates 3 and 4, the shaft 1 is positioned at a correct position in the radial direction, and the shaft 1 can be aligned. The positioning surfaces 3c and 4c are inclined surfaces in which the inner peripheral side of the side plates 3 and 4 is thick and the outer peripheral side is thin, that is, inclined surfaces whose inclination directions are opposite to those of the positioning surfaces 3c and 4c shown in FIG. Even if both end surfaces 5a and 5b of the vane 5 are inclined surfaces following this, the positioning in the radial direction of the shaft 1 is possible. Further, as shown in FIG. 4, all of the sliding contact surfaces (shaded portions in FIG. 4), which are in the range where both end surfaces 5a, 5b of the vane 5 are in sliding contact with the side plates 3, 4, are used as positioning surfaces 3c, 4c. Although it is made to be a taper surface, if it is in the range of this sliding contact surface, other than the circumferential direction both ends of positioning surface 3c, 4c, ie, an inner edge and an outer edge, can be determined arbitrarily. However, from the viewpoint of receiving a lateral force input from the shaft 1, the positioning surfaces 3c and 4c are the entire sliding contact surfaces, and both end surfaces 5a and 5b of the vane 5 are tapered surfaces that are in sliding contact with the positioning surfaces 3c and 4c. This is advantageous because the contact area increases. Further, from the viewpoint of positioning the shaft 1 in the radial direction, a curved surface or a spherical surface is adopted in addition to the positioning surfaces 3c and 4c of the side plates 3 and 4 and both end surfaces 5a and 5b of the vane 5 being tapered surfaces. In that case, if the curved surface or spherical surface of the side plate 3 does not have the curved surface or spherical surface of the side plate 4 on the same spherical surface, the shaft 1 rotates clockwise and counterclockwise in FIG. This is preferable because it does not rotate clockwise.

  Note that a U-shaped seal 10 is attached to both ends and the tip of the vane 5. The seal 10 is in sliding contact with the case 2 and the side plates 3 and 4, and the vane 5, the case 2 and the side plates 3 and 3 are in contact with each other. 4 is sealed. In addition, a U-shaped seal 29 is attached to the inner periphery of the main body 20 of the case 2 and the portion that is in sliding contact with the outer periphery of the enlarged diameter portion 1 c of the shaft 1 and the left and right ends of the main body 20. A side seal 12 is provided on the inner periphery of the side plate 3 so as to be in sliding contact with both the inner wall of the shaft insertion hole 3b and the enlarged diameter portion 1c of the shaft 1 to seal between the side plate 3 and the shaft 1. Further, on the inner periphery of the side plate 4, a side seal 13 is slidably brought into contact with both the inner wall of the shaft insertion hole 4 b and the enlarged diameter portion 1 c of the shaft 1 to seal between the side plate 4 and the shaft 1. Is provided.

  The one chamber R1 and the other chamber R2 are connected via the damping valve V by the seal 29, the seal 10 provided on the vane 5, the side seals 12 and 13 attached to the inner periphery of the plates 6 and 7, and the O-rings 27 and 28. So as not to communicate with each other.

  Next, the operation of the rotary damper D configured as described above will be described. When the shaft 1 rotates counterclockwise in FIG. 2 and the vane 5 compresses the one chamber R1, the pressure in the one chamber R1 rises and the one leaf valve 34 bends to open the one 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 1. On the contrary, when the shaft 1 rotates clockwise in FIG. 2 and the vane 5 compresses the other chamber R2, the pressure in the other chamber R2 rises and the other leaf valve 35 is bent to open the other port 33b. 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 1.

  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 1a to increase or decrease the volume of the air chamber G. The volume change is compensated. In this case, the compensation means includes a sliding partition wall 32 slidably inserted into the hollow portion 1a, 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, the positioning surfaces 3c and 4c are provided on the sliding contact surfaces that are in the range where the end surfaces 5a and 5b of the vanes 5 of the side plates 3 and 4 are in sliding contact, and both end surfaces of the vane 5 are provided. 5a and 5b are in sliding contact with each other, so that the shaft 1 can be positioned in the radial direction. When a lateral force is input to the shaft 1, the side plates 3 and 4 receive the lateral force and The plates 3 and 4 can also function as bearings.

  In this way, the side plates 3 and 4 exhibit a centering function with the shaft 1 bearing, and the side plates 3 and 4 are made of a material having high hardness which is in sliding contact with the vane 5 and has excellent wear resistance. Therefore, it can withstand high lateral force, the bush can be eliminated, the axial length of the rotary damper D can be shortened, and the radial size is not increased.

  Therefore, according to the rotary damper D, it is possible to sufficiently withstand the lateral force input to the shaft 1 without increasing the size and weight.

  In addition, as described above, the positioning surfaces 3c and 4c provided on the side plates 3 and 4 can adopt a curved surface or a spherical surface in addition to the tapered surface, or a surface shape whose inclination direction changes midway, that is, It is also possible to adopt a shape such as a chevron surface or a corrugated surface.

  Further, in the above-described example, the side plates 3 and 4 and the side panels 6 and 7 are configured as separate parts, so that the side panels 6 and 7 can be made of a light material to reduce the overall weight of the rotary damper D. However, it is also possible to consolidate both into one part.

  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.

1 Shaft 2 Case 3, 4 Side plate 3c, 4c Positioning surface 5 Vane 6, 7 Side panel R Working chamber R1 One chamber R2 Other chamber

Claims (3)

A shaft, a ring-shaped case provided with a working chamber inside, a pair of side plates that close both sides of the case in the axial direction and through which the shaft is rotatably inserted, and a tip provided on the shaft. In a rotary damper having a vane that is in sliding contact with the inner periphery of the case and that is in sliding contact with the side plates to partition the working chamber into one chamber and the other chamber, a part of the vane sliding surface of the side plate Alternatively, a rotary damper having a positioning surface for slidingly contacting the vane and positioning the shaft in a radial direction is provided. The rotary damper according to claim 1, wherein the positioning surface is a tapered surface. 2. A side panel that includes a through hole through which the shaft is rotatably inserted and that holds a seal member that is in sliding contact with the outer periphery of the shaft on the opposite side of each side plate. The rotary damper according to 2.

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