JP2013024256A - Rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary damper capable of arbitrarily changing a resistance force during its use.SOLUTION: The rotary damper 1 and 100 include a damper housing 2 having a liquid chamber 10 filled with viscous fluid and a rotor 3 rotatably supported inside the liquid chamber. The rotor includes a rotor shaft 25 rotatably housed in the liquid chamber, vanes 26 protrusively provided on the outer periphery of the rotor shaft, a first rotor 21 provided with at least one opening 59 provided on the vane and penetrating through in a rotary direction of the rotor shaft, a second rotor 22 provided rotatably together with the first rotor and shiftable to the first rotor to change a liquid passage of the viscous fluid, in which an opening is formed through shifting, and an operative member 23 for changing a position of the second rotor to the first rotor.

Description

  The present invention relates to a rotary damper in which a rotor is rotatably supported in a housing enclosing a viscous fluid so that a flow resistance of the viscous fluid acts on the rotation of the rotor.

  A rotary damper having a cylindrical housing having a liquid chamber in which a viscous fluid is sealed, and a rotor rotatably supported by the housing, in which the rotation of the rotor is attenuated by the resistance of the viscous fluid, is known. ing. The rotor has one end received in the liquid chamber and the other end protruding to the outside of the housing, and a vane (rotor blade) protruding radially outward from the outer peripheral surface of the portion of the rotor shaft located in the liquid chamber. (For example, Patent Document 1). The other end (outer end) of the rotor shaft is connected to a rotating member (such as a gear) whose rotation is to be attenuated. When the rotor rotates, the viscous fluid passes through a passage formed between the vane and the inner wall of the housing, and the flow resistance of the viscous fluid at this time acts as a rotational resistance on the rotor.

Japanese Patent Laid-Open No. 2003-247583

  The resistance force generated by the rotary damper as described above is determined by the shape and relative position of the housing and the rotor. Therefore, when the rotary damper is completed by combining the housing and the rotor, the resistance force cannot be arbitrarily changed without disassembling the rotary damper.

  This invention is made | formed in view of the above background, Comprising: It aims at providing the rotation damper which can change resistance force arbitrarily at the time of use.

  In order to solve the above problems, the present invention includes a damper housing (2) having a liquid chamber (10) in which a viscous fluid is sealed, and a rotor (3) rotatably supported in the liquid chamber. A rotary damper (1, 100), wherein the rotor includes a rotor shaft (25) rotatably received in the liquid chamber and a vane (26) projecting from an outer peripheral surface of the rotor shaft, A first rotor (21) in which at least one opening (59) penetrating in the rotation direction of the rotor shaft is formed in the vane, and the vane is rotatably provided with the first rotor. A second rotor (22) that is provided so as to be displaceable, and that changes the fluid path of the viscous fluid formed by the opening, and an operation member that changes the position of the second rotor relative to the first rotor. (2 And having a) and.

  According to this configuration, the relative position of the second rotor with respect to the first rotor can be changed by operating the operating member, and the liquid path formed by the opening of the first rotor can be changed. Therefore, the resistance force generated by the rotary damper can be arbitrarily changed during use.

  In another aspect of the present invention, the rotor shaft has an outer end (32) protruding from the damper housing, and the rotor shaft and the vane extend from the outer end of the rotor shaft to the inside of the vane. Thus, an internal space (58) communicating with the opening is formed, the second rotor is accommodated in the internal space so as to be displaceable in the axial direction of the rotor shaft, and the operating member is disposed at an outer end of the rotor shaft. The second rotor is displaced in the axial direction of the rotor shaft.

  According to this configuration, the operation member is disposed outside the damper housing, and the operation becomes easy.

  In another aspect of the present invention, the second rotor is biased toward the outer end side of the rotor shaft by a biasing member (24), and the operation member is coupled to the outer end of the rotor shaft. The second rotor is pressed toward the inner end side of the rotor shaft.

  According to this configuration, the relative position of the second rotor with respect to the first rotor can be changed by changing the pushing length of the second rotor in the axial direction of the rotor shaft by the operating member.

  In another aspect of the present invention, the second rotor has a plurality of orifices (82) penetrating in the rotational direction of the rotor shaft, and the second rotor is an axis of the rotor shaft with respect to the first rotor. The sum of the cross-sectional areas of the orifices arranged in the opening is changed by displacement in the direction.

  According to this configuration, the second rotor moves relative to the first rotor, and the resistance force generated by the rotary damper can be changed by changing the sum of the sectional areas of the orifices existing in the opening. .

  Another aspect of the present invention is characterized in that the orifice includes orifices having different shapes or different cross-sectional areas.

  According to this configuration, the resistance force generated by the rotary damper can be set to various magnitudes.

  Another aspect of the present invention is characterized in that the operation member is non-rotatably coupled to the first rotor.

  According to this configuration, the rotating member whose rotation is to be attenuated can be coupled to the operation member. That is, the operation member can be used as the input shaft.

  According to the above configuration, it is possible to provide a rotary damper that can arbitrarily adjust the resistance force during use.

1 is an exploded perspective view of a rotary damper according to a first embodiment. Sectional drawing which shows the rotary damper which concerns on 1st Embodiment isolate | separating an operation member III-III sectional view of FIG. Sectional drawing which shows the 1st form of the rotary damper which concerns on 1st Embodiment Sectional drawing which shows the 2nd form of the rotary damper which concerns on 1st Embodiment Sectional drawing which shows the 3rd form of the rotary damper which concerns on 1st Embodiment. The perspective view which shows the 2nd rotor of the rotary damper which concerns on 2nd Embodiment. Sectional drawing which shows the 1st form of the rotary damper which concerns on 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the rotary damper 1 according to the first embodiment includes a cylindrical housing 2 and a rotor 3 partially received in the housing 2. The axes of the housing 2 and the rotor 3 are arranged on the same axis and coincide with the axis A serving as the rotation axis of the rotary damper 1. Hereinafter, the direction along the axis A is referred to as the axis direction.

  The housing 2 has one end in the axial direction of the cylindrical side peripheral wall 6 closed by a bottom plate 7, and a bottomed cylindrical housing base 8 opened at the other end, and a disc closing the opening end of the housing base 8. It is comprised from the shape-like housing lid | cover 9. As shown in FIG. The housing base 8 and the housing lid 9 are made of resin, for example. A fitting convex portion 12 projecting in the axial direction is extended at the opening end of the side peripheral wall 6 of the housing base 8 over the entire circumference, and the fitting convex portion 12 can be fitted to the peripheral portion of the housing lid 9. A fitting groove 13 is recessed in an annular shape. The housing base 8 and the housing lid 9 are joined to each other by vibration welding in a state where the fitting convex portion 12 is fitted in the fitting groove 13. Thereby, the liquid chamber 10 is defined in the housing 2. The coupling between the housing base 8 and the housing lid 9 is not limited to vibration welding, and a known method such as using an adhesive may be substituted. The housing base 8 and the housing lid 9 are joined after receiving a rotor 3 (described later) therein and filled with a viscous fluid such as silicone oil.

  On the outer surface of the bottom plate 7 of the housing base 8, a key 14 protruding in the axial direction is extended in the diameter direction (see FIG. 2). The key 14 couples the housing base 8 so as not to rotate about the axis A to a device such as a door in which the rotary damper 1 is incorporated. Instead of the key 14, a flange used for bolt fastening may be provided protruding from the peripheral edge of the bottom plate 7.

  The rotor 3 includes a first rotor (outer rotor) 21, a second rotor (inner member) 22, an operation member 23, and a compression coil spring 24. The 1st rotor 21, the 2nd rotor 22, and the operation member 23 are formed, for example from resin. The first rotor 21 has a cylindrical rotor shaft 25 that is open at both ends, and two vanes 26 that project from the outer peripheral surface of the rotor shaft 25 outward in the radial direction of the rotor shaft 25.

  One end of the rotor shaft 25 is fitted in a bearing hole 27 which is a bottomed hole having a circular cross section formed in the center of the bottom plate 7 of the housing base 8 so as to be rotatable about the axis A. The other end of the rotor shaft 25 is supported by a bearing hole 28 which is a through-hole having a circular cross section formed in the center portion of the housing lid 9 so as to be rotatable around the axis A, and the tip thereof is located outside the housing lid 9. It protrudes. An end portion of the rotor shaft 25 located in the housing 2 is an inner end 31, and an end portion protruding from the housing 2 is an outer end 32. In other embodiments, the rotor shaft 25 may not protrude outward from the housing lid 9. In this case, it is only necessary that the rotor shaft 25 can be accessed from the outside of the housing lid 9 through the bearing hole 28. The rotor shaft 25 is formed with an inner hole 33 having a circular cross section penetrating from the inner end 31 to the outer end 32.

  The outer end 32 of the rotor shaft 25 is formed with a first engagement groove 34, a second engagement groove 35, and a third engagement groove 36 extending from the end surface toward the inner end 31 along the axis A direction. ing. Each of the engaging grooves 34 to 36 extends in the radial direction so as to communicate the outer peripheral surface of the rotor shaft 25 and the inner hole 33. Each of the engaging grooves 34 to 36 is formed at a rotational position displaced by 45 ° about the axis line A with the adjacent engaging grooves 34 to 36. The depth of each of the engagement grooves 34 to 36 in the axis A direction is such that the first engagement groove 34 <the second engagement groove 35 <the third engagement groove 36. A first engagement hole 37 is formed in the inner surface of the inner hole 33 facing the first engagement groove 34 with the axis A therebetween. The first engagement hole 37 is formed at a position displaced from the bottom of the first engagement groove 34 toward the inner end 31. Similarly, a second engagement hole 38 and a third engagement hole 39 are formed on the inner surface of the inner hole 33 facing the second engagement groove 35 and the third engagement groove 36 with the axis A therebetween.

  An O-ring 41 is fitted on the outer peripheral surface of the outer end 32 of the rotor shaft 25. The inner end side of the bearing hole 28 of the housing lid 9 is expanded in diameter to form an O-ring accommodating portion 42. The O-ring 41 is disposed in the O-ring housing portion 42 of the housing lid 9 while being fitted to the outer end 32 of the rotor shaft 25, and seals the gap between the outer end 32 and the O-ring housing portion 42.

  The two vanes 26 are formed at 180 ° rotation positions around the axis A. In other embodiments, the number of vanes 26 may be one, or three or more. Each vane 26 protrudes from the outer surface of the rotor shaft 25 and protrudes from the front wall 51 facing the one rotation direction of the rotor 3, and the outer surface of the rotor shaft 25 through the front wall 51 and the gap. A back wall 52 facing in the other rotation direction opposite to the one rotation direction, a side wall 53 that continues the outer edges in the radial direction of the axis A of the front wall 51 and the back wall 52, a front wall 51, a back wall 52, a side wall 53 is formed in a box shape having a hole 56 opened to the inner end 31 side of the rotor shaft 25 (see FIG. 2 and FIG. 2). 3). The air hole 56 and the inner hole 33 of the rotor shaft 25 are continuous by the communication path 57 (see FIGS. 2 and 3). The communication passage 57 extends along the direction of the axis A, and one end reaches the inner end 31 of the rotor shaft 25. The inner hole 33 of the rotor shaft 25, the hole 56 of the vane 26, and the communication path 57 are collectively referred to as an internal space 58 of the first rotor 21.

  Each of the front wall 51 and the rear wall 52 has one opening 59 having a square cross section that penetrates in the rotation direction around the axis A of the rotor 3 (first rotor 21) (hereinafter simply referred to as the rotation direction of the rotor 3). As described above (three in this embodiment), they are formed at appropriate positions. As shown in FIG. 3, the opening 59 formed in the front wall 51 and the opening 59 formed in the back wall 52 face each other in the rotation direction of the rotor 3.

  The second rotor 22 has a columnar shaft portion 61 and a plurality of shielding plates 62 protruding from the outer peripheral surface of the shaft portion 61. In the present embodiment, three pairs of the shielding plates 62 protruding in the radial direction opposite to each other from the shaft portion 61 are arranged at a predetermined interval in the axial direction. The shaft portion 61 is fitted in the inner hole 33 so as to be displaceable in the direction of the axis A, and the shielding plate 62 is disposed in the hole 56 and the communication path 57. That is, the second rotor 22 is accommodated in the internal space 58 of the first rotor 21 so as to be displaceable in the direction of the axis A. The arrangement of the second rotor 22 in the internal space 58 is performed by inserting the second rotor 22 into the internal space 58 of the first rotor 21 from the inner end 31 side.

  As shown in FIG. 2, when the rotor 3 is accommodated in the housing 2, the compression coil spring 24 is interposed between the shaft portion 61 with the second rotor 22 and the bottom portion of the bearing hole 27 of the housing base 8. The second rotor 22 is biased toward the outer end 32 in the first rotor 21.

  The operation member 23 includes a cylindrical leg 71 that can be fitted to the inner hole 33 of the first rotor 21 on the outer end 32 side, and a head having a larger outer shape than the leg 71 provided at one end of the leg 71. 72. On the outer surface of the leg portion 71, a positioning convex portion 73 extending from the head 72 along the axis A direction is projected. An elastic claw 74 cut out by a U-shaped slit is formed on the side of the leg 71 at a position opposite to the positioning projection 73 and the axis A. The elastic claw 74 can be projected and retracted in the radial direction of the leg portion 71 by bending, and has a check surface that protrudes outward in the radial direction and faces the head 72 side.

  The corner of the end of the head 72 is cut off to form a key. Thereby, the head 72 can be coupled to a rotating member such as a gear whose rotation is to be attenuated in a non-rotatable manner. Instead of the key, the head 72 may be non-rotatably coupled to the rotating member by bolt fastening or adhesion. An O-ring groove 75 extending in the circumferential direction is recessed in the outer peripheral surface of the leg portion 71, and an O-ring 76 is fitted in the O-ring groove 75.

  The operation member 23 inserts the leg portion 71 into the outer end 32 side of the inner hole 33, fits the positioning convex portion 73 into one of the first to third engagement grooves 34 to 36, and corresponds the elastic claw 74. The first rotor 21 is coupled to the first rotor 21 by engaging with the first to third engagement holes 37 to 39. At this time, the leg portion 71 presses the second rotor 22 and displaces the second rotor 22 toward the inner end 31 in the axis A direction against the urging force of the compression coil spring 24. The insertion depth of the operation member 23 into the inner hole 33 is determined depending on which of the first to third engagement grooves 34 to 36 is fitted to the positioning projection 73, and the second rotor 22 relative to the first rotor 21 is determined. The position is fixed. The O-ring 76 seals between the outer peripheral surface of the leg portion 71 and the inner peripheral surface of the inner hole 33.

  Next, effects of the rotary damper 1 according to the present embodiment will be described with reference to FIGS. Although not shown in the state shown in FIG. 4, the positioning projection 73 of the operation member 23 is partially engaged with the first engagement groove 34 and the elastic claw 74 is engaged with the first engagement hole 37. The form is shown. In the first form, the positioning protrusion 73 abuts against the bottom of the first fitting groove 34, whereby the insertion depth of the operation member 23 with respect to the inner hole 33 of the leg portion 71 is determined, and the elastic claw 74 is the first engagement hole. By engaging with 37, the relative position of the operation member 23 with respect to the first rotor 21 is fixed. That is, the operation member 23 is prevented from coming out from the inner hole 33. In the first mode, the operation member 23 presses the second rotor 22 against the urging force of the compression coil spring 24, and the shielding plate 62 is disposed at a position to close the opening 59. In this state, a rotational force around the axis A is input to the head 72 of the operation member 23, and when the rotor 3 rotates around the axis A with respect to the housing 2, the viscous fluid is outside the vane 26 in the radial direction. And a passage formed between the inner surface of the side peripheral wall 6 of the housing base 8. The rotary damper 1 generates a resistance force against the rotation of the rotor 3 due to the flow resistance of the viscous fluid at this time. Since the opening 59 is closed by the shielding plate 62, the viscous fluid cannot flow through the opening 59.

  Although not shown, the state shown in FIG. 5 is a second state in which a part of the positioning convex portion 73 of the operation member 23 is fitted into the second engagement groove 35 and the elastic claw 74 is engaged with the second engagement hole 38. The form is shown. Since the second engagement groove 35 is deeper in the direction of the axis A than the first engagement groove 34, the insertion depth of the leg 71 of the operation member 23 into the inner hole 33 is deeper than in the first embodiment. Therefore, as shown in FIG. 5, the position of the second rotor 22 in the second form relative to the first rotor 21 is displaced toward the inner end 31 than in the first form, and the shielding plate 62 is below the opening 59. Only the half part is closed, and a liquid path is formed in the vane 26 by the opening 59 and the holes 56. In this state, when the rotor 3 rotates about the axis A with respect to the housing 2, the viscous fluid is formed between the outer end in the radial direction of the vane 26 and the inner surface of the side peripheral wall 6 of the housing base 8. And the liquid path by the opening 59. Therefore, the resistance force generated by the rotary damper 1 is smaller in the second form than in the first form.

  The state shown in FIG. 6 shows a third form in which a part of the positioning convex portion 73 of the operation member 23 is fitted into the third engagement groove 36 and the elastic claw 74 is engaged with the third engagement hole 39. Yes. Since the third engagement groove 36 is deeper in the direction of the axis A than the second engagement groove 35, the insertion depth of the operation member 23 in the leg portion 71 of the operation member 23 in the third embodiment is smaller than that in the second embodiment. Deepen. Therefore, as shown in FIG. 6, the position of the second rotor 22 with respect to the first rotor 21 in the third embodiment is displaced toward the inner end 31 than in the second embodiment, and the shielding plate 62 opens the opening 59. (The state in which the shielding plate 62 and the opening 59 do not overlap each other when viewed from the rotation direction of the rotor 3). That is, in the third form, the cross-sectional area of the liquid path formed by the opening 59 is larger than that in the second form. In this state, when the rotor 3 rotates about the axis A with respect to the housing 2, the viscous fluid becomes easier to pass through the liquid path formed by the opening 59 than in the second form, so that the rotary damper 1 is generated. The resistance force to be applied is smaller in the third form than in the second form.

  As described above, the rotary damper 1 according to the present embodiment selects the engagement grooves 34 to 36 into which the positioning projections 73 of the operation member 23 are fitted, whereby the first rotor 21 of the second rotor 22 is selected. It is possible to change the resistance force generated by changing the relative position with respect to, changing the cross-sectional area of the liquid passage formed in the vane 26. In the rotary damper 1, the resistance force can be changed in three stages by providing three engagement grooves 34 to 36. However, by further providing engagement grooves with different depths, or in a larger range, The resistance force can be changed with more variable steps.

  Next, the rotary damper 100 according to the second embodiment will be described. In the rotary damper 100, the shape of the shielding plate 81 of the second rotor 22 and the opening 84 formed in the vane 26 is different from that of the rotary damper 1 of the first embodiment.

  As shown in FIG. 7, the shielding plate 81 of the rotary damper 100 is formed in a plate shape, and two shaft portions 61 are provided. Each shielding plate 81 protrudes in a direction opposite to each other from the shaft portion 61 along one radial direction, and extends along the axial direction of the shaft portion 61. The shielding plate 81 is inserted into the internal space 58 of the first rotor 21 together with the shaft portion 61 to close the opening 59.

  One or more identical orifices 82 penetrating the shielding plate 81 in the thickness direction are formed at appropriate positions of the shielding plate 81. In this embodiment, the cross section of the orifice 82 is circular, but in other embodiments, various shapes such as a polygon and an ellipse may be applied. Further, the orifice 82 may be changed in diameter and shape in the length direction, or may be provided with a diaphragm.

  As shown in FIG. 8, the opening 84 formed so as to penetrate the front wall 51 and the back wall 52 of the vane 26 is narrower in the axis A direction than the opening 59 of the first embodiment. Has been.

  In the rotary damper 100 configured as described above, in the first mode in which a part of the positioning convex portion 73 of the operation member 23 is fitted in the first engagement groove 34, three orifices 82 are provided in one opening 84. Be placed. In the second configuration in which a part of the positioning convex part 73 is fitted in the second engaging groove 35, two orifices 82 are arranged in one opening 84, and a part of the positioning convex part 73 is the third engaging part. In the third embodiment fitted in the mating groove 36, one orifice 82 is disposed in one opening 84. That is, by operating the operating member 23 and displacing the second rotor 22 in the direction of the axis A with respect to the first rotor 21, the number of orifices 82 arranged in one opening 84 changes. When the number of the orifices 82 changes, the sum of the cross-sectional areas of the orifices 82 disposed in one opening 84 changes, and the size of the flow path of the viscous fluid formed by the openings 84 and the orifice 82 changes. Thus, the resistance force generated by the rotary damper 100 changes.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. In the present embodiment, three engagement grooves 34 to 36 that engage with the positioning convex portion 73 of the operation member 23 are provided and the insertion depth of the leg portion 71 can be changed in three stages. By making 36 a continuous cam surface, the insertion depth of the leg portion 71 may be continuously changeable. Various shapes can be applied to the shielding plate 62 and the opening 59.

  DESCRIPTION OF SYMBOLS 1,100 ... Rotary damper, 2 ... Housing, 3 ... Rotor, 8 ... Housing base, 9 ... Housing lid, 10 ... Liquid chamber, 21 ... 1st rotor, 22 ... 2nd rotor, 23 ... Operation member, 24 ... Compression Coil spring (biasing member), 25 ... rotor shaft, 26 ... vane, 31 ... inner end, 32 ... outer end, 33 ... inner hole, 34-36 ... engagement groove, 37-39 ... engagement hole, 51 ... Front wall, 52 ... back wall, 53 ... side wall, 54 ... upper wall, 56 ... hole, 57 ... communication path, 58 ... internal space, 59, 84 ... opening, 61 ... shaft, 62, 81 ... shielding plate , 71 ... Leg part, 73 ... Positioning convex part, 74 ... Elastic claw, 82 ... Orifice, A ... Axis line

Claims (6)

A rotary damper comprising a damper housing having a liquid chamber filled with a viscous fluid, and a rotor rotatably supported in the liquid chamber,
The rotor is
A rotor shaft rotatably received in the liquid chamber and a vane protruding from the outer peripheral surface of the rotor shaft, and at least one opening penetrating in the rotation direction of the rotor shaft is formed in the vane. A first rotor;
A second rotor that is rotatably provided with the first rotor, is provided so as to be displaceable with respect to the first rotor, and changes a liquid path of the viscous fluid formed by the opening by being displaced;
An operation member that changes a position of the second rotor relative to the first rotor. The rotor shaft has an outer end protruding from the damper housing;
The rotor shaft and the vane reach the inside of the vane from the outer end of the rotor shaft, and an internal space communicating with the opening is formed.
The second rotor is accommodated in the internal space so as to be displaceable in the axial direction of the rotor shaft,
2. The rotary damper according to claim 1, wherein the operation member is provided at an outer end of the rotor shaft and displaces the second rotor in an axial direction of the rotor shaft. The second rotor is biased toward the outer end side of the rotor shaft by a biasing member,
The rotary damper according to claim 2, wherein the operating member is coupled to the outer end of the rotor shaft and presses the second rotor toward the inner end of the rotor shaft. In the second rotor, a plurality of orifices penetrating in the rotation direction of the rotor shaft are formed,
The sum of the cross-sectional areas of the orifices exposed in the opening changes as the second rotor is displaced in the axial direction of the rotor shaft with respect to the first rotor. Item 4. The rotary damper according to any one of items 3 to 3.   The rotary damper according to claim 4, wherein the orifice includes orifices having different shapes or different cross-sectional areas.   The rotary damper according to any one of claims 1 to 5, wherein the operation member is non-rotatably coupled to the first rotor.

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