JP4474666B2 - Rotating damper with torque adjustment function - Google Patents

Description

  According to the present invention, the magnitude of the torque generated when the drum rotates can be reduced by making the vane member separable from the cylindrical portion of the drum and adjusting the interval between the vane member and the cylindrical portion of the drum. The present invention relates to a rotary damper with a torque adjustment function that can be adjusted.

  Conventionally, as this type of rotary damper with a torque adjustment function, there are those according to Patent Documents 1 to 4. That is, Patent Document 1 includes a movable drum movable inside a casing filled with a viscous fluid and a rotating drum that slides and rotates between the inner wall surfaces of the casing, and a brake shaft connected to the rotating drum. A configuration is disclosed in which the rotational speed of the rotary drum is changed and adjusted by a clutch that transmits the rotational motion in only one direction and interrupts the rotational motion in the other direction, and an adjustment screw for moving the movable drum.

  Moreover, in patent document 2, in addition to the structure of patent document 1, it comprised so that the clearance gap between a rotary body and a movable body might change with a thermal expansion difference according to surrounding temperature changes, and the viscosity change of a viscous fluid The change in the damper force due to this is offset by this thermal expansion difference.

  Patent Document 3 discloses a configuration in which a facing surface between a movable member arranged to be movable in the axial direction in a casing and a rotating member arranged to be rotatable with respect to the movable member is formed in a tapered shape. Is disclosed.

Further, in Patent Document 4, by rotating the torque adjusting body relative to the drive shaft, the slide member is slid in the radial direction to change the distance between the outer surface of the slide member and the inner circumferential surface of the rotary member. A configuration for changing the rotational torque is disclosed.
JP-A-8-93312 JP-A-8-128257 JP 2001-108004 A JP 2001-187934 A

  However, in the conventional rotary damper with a torque adjustment function, for example, in Patent Documents 1 and 2, since there is only one bearing portion of a shaft member such as a rotating drum or a rotating body, an impact is applied to the shaft member. The shaft member is likely to be shaken, and at the same time, the planned torque cannot be obtained due to the shake of the shaft member. In addition, it is difficult to maintain a stable sealing performance due to the shading of the shaft member, and the possibility of oil leakage increases. Further, conventionally, the torque adjustment is performed by changing the size of the area of the sliding portion of the torque generating unit, that is, the rotating drum or the rotating body and the portion facing the movable drum or the moving body. The amount of adjustment movement necessary to perform the torque adjustment becomes larger.

In the case of Patent Documents 3 and 4, since the bearing portion is not provided in a rigid body portion such as the first housing or the second housing, and is provided via an adjustment screw, for example, the shaft member itself is stabilized. As a result, as in the case of Patent Documents 1 and 2, when an impact is applied to the shaft member, the shaft member is easily shaken, and at the same time, the torque expected by the shaft member being shaken is reduced. You can't get it. In addition, it is difficult to maintain a stable sealing performance due to the shading of the shaft member, and the possibility of oil leakage increases.
This is because, in Patent Document 3, an adjustment screw (operation part for torque adjustment) is provided on the same axis as the rotating member, so if one attempts to support the rotating shaft at two locations, This is because the adjustment screw had to be provided. Also in Patent Document 4, as in Patent Document 3, since the operation portion of the cam member, which is a torque adjusting means, is provided on the same axis as the rotating member, the bearing portion of the rotating member must be made one place. Because there was not.

  Therefore, the present invention was created in view of various circumstances that existed in the past, such that the vane member can be separated from and connected to the cylindrical portion of the drum, and the distance between the vane member and the cylindrical portion of the drum is set. By adjusting, the drum that can adjust the magnitude of the torque generated when the drum rotates can stably support the drum so as not to cause blurring, thereby obtaining a stable torque. Rotating damper with a torque adjustment function that can maintain stable sealing performance by minimizing the seal location, thereby eliminating the possibility of oil leakage and minimizing the starting torque The purpose is to provide.

In the present invention, a first housing member having an opening on one side, a bottom on the other side, and a first bearing portion provided on the bottom, and the first housing A second housing member that closes the opening of the member and is provided with a second bearing portion; a first bearing portion of the first housing member; and a second bearing portion of the second housing member; And a shaft member provided so that one end thereof extends outward from the first or second housing member, and the first and second housing members define the shaft member around the shaft member. An oil chamber formed, a drum that is rotatable with the shaft member in the oil chamber, and has a cylindrical wall extending along an inner periphery of the oil chamber; and is supported by the first housing member; Vane member provided so as to be movable in the direction of separation A vane movement adjusting member which is provided so as to be rotatable around the shaft member, and is engaged with the vane member so that the interval between the cylindrical wall and the vane member can be changed according to the rotation. It is comprised from the operation part of the said vane movement adjustment member supported by the said 1st or 2nd housing member in the position eccentric with respect to the said shaft member.
The first housing member may have a small cylindrical wall surrounding a part of the shaft member, and the vane movement adjusting member may be rotatably supported by the small cylindrical wall.
The small cylindrical wall of the first housing member may be provided with an adjustment ring for stopping the rotation of the vane movement adjusting member at a constant pitch.
The bottom portion of the first housing member may be closed on the end surface side of the shaft member held by the first bearing portion.
The drum may have an oil reservoir on a surface of the cylindrical wall that contacts the vane member.
The operation portion is composed of a short shaft with an operation surface exposed to the outside of the housing member, and a rotation transmission that transmits the rotation of the short shaft to the vane movement adjustment member between the short shaft and the vane movement adjustment member. A mechanism is interposed.

  According to the present invention, the magnitude of the torque generated when the drum rotates by adjusting the distance between the vane member and the drum cylindrical portion by making the vane member separable from the drum cylindrical portion. The drum can be adjusted in a stable manner, so that the drum can be stably supported so as not to cause blurring, thereby obtaining a stable torque and a stable seal by minimizing the number of seals. The performance can be maintained, thereby eliminating the possibility of oil leakage and minimizing the starting torque.

  That is, the present invention relates to a first housing member having an opening on one side and a bottom on the other side, and a first bearing portion provided on the bottom, and the first housing A second housing member that closes the opening of the member and is provided with a second bearing portion; a first bearing portion of the first housing member; and a second bearing portion of the second housing member; The shaft member is supported by at least two places, and is provided with a shaft member provided so that one end portion extends outward from the first or second housing member, and the first and second housing members. An oil chamber defined around the drum, a drum having a cylindrical wall that is rotatable with the shaft member in the oil chamber and extending along an inner periphery of the oil chamber, and is supported by the first housing member, Moves in the direction of contact with the cylindrical wall The vane member provided on the shaft member is rotatably provided around the shaft member, and is engaged with the vane member so that the interval between the cylindrical wall and the vane member can be changed according to the rotation. This is because the vane movement adjusting member and the operation portion of the vane movement adjusting member supported by the first or second housing member at a position eccentric with respect to the shaft member. Accordingly, the shaft member and the second bearing portion of the second housing are supported by bearings at two locations, ie, the first bearing portion of the first housing, thereby reliably preventing the shaft member and the drum from blurring. be able to.

  When the vane movement adjusting member is rotatably supported by the small cylindrical wall that surrounds a part of the shaft member of the first housing member, the vane member that is separated from and in contact with the cylindrical wall of the drum is also prevented. be able to. At this time, if an adjustment ring for stopping the rotation of the vane movement adjusting member at every constant pitch is provided on the small cylindrical wall of the first housing member, an easy and reliable adjustment operation can be performed. .

  When the bottom portion of the first housing member is closed on the end face side of the shaft member held by the first bearing portion, the member on the shaft member side and the member on the housing member side that always rotate relative to the housing member The viscous fluid sealing member is between the opening on the opposite side and the sealing performance of the viscous fluid is improved.

  If the drum has an oil reservoir on the surface of the cylindrical wall that contacts the vane member, it is possible to prevent unstable torque from being generated due to oil shortage when the cylindrical wall and the vane member are in contact with each other.

  The operation unit is composed of a short shaft with an operation surface exposed to the outside of the housing member, and a rotation transmission mechanism that transmits the rotation of the short shaft to the vane movement adjustment member between the short shaft and the vane movement adjustment member. As a result, the necessary torque adjustment can be performed with a slight adjustment operation of the operation unit, and the adjustment operation can be simplified and shortened.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. Reference numeral 1 shown in the figure is an apparatus main body in a rotary damper with a torque adjusting function according to the present invention. As shown in FIGS. 1 and 2, the housing of the apparatus main body 1 includes a first housing member 11 and a second housing member 21.

The first housing member 11 has a female thread groove on the inner peripheral surface of the opening 13 on one side, a cylindrical outer tube portion 14 in the middle portion, and a bottom portion 15 on the other side. . A small cylindrical wall 16 projects from the center of the bottom 15 to form a first bearing portion 12 formed by drilling the inside of the small cylindrical wall 16 in a circular deep groove shape. Further, one end of a shaft member 2A (shaft) of the drum 2 to be described later is supported so as to be relatively rotatable via a metal bearing 3 to be described later and a fixed bush 39 having a function of preventing the vane movement adjusting member from coming off. Further, in order to constitute the torque adjusting means 31, a protruding wall 18 having a cylindrical inner surface is formed via an annular groove portion 17 surrounding the outer periphery of the small cylindrical wall 16. Horizontal guide frame portions 18A are formed at the upper and lower ends of the protruding wall 18, respectively. Further, an inner groove 12A is formed along the axial direction at a symmetrical position on the inner peripheral wall surface of the first bearing portion 12. An opening for the adjusting operation means 41 is formed at a position eccentric with respect to the first bearing portion 12.
In the illustrated example, the first housing member 11 has a bottom portion 15 integrally. However, the bottom portion may be a separate body and coupled and fixed to the first housing member 11. In this case, it is necessary to seal the internal viscous fluid from leaking out of the housing from the joint portion between the member constituting the separate bottom and the first housing member. The inner groove 12A is formed from the inner peripheral wall surface to the inner bottom surface of the bearing portion 12, and when the end of the shaft member 2A is inserted into the bearing portion 12, the viscous fluid inside the bearing portion 12 is allowed to flow inside. It is for escaping to the oil chamber through the groove 12A.

  The second housing member 21 is formed by a cylindrical cap member whose one end is closed by a bottom 24, and an annular protrusion 26 formed by penetrating a circular hole-like support hole 23 in the center is formed in a plurality of ribs. A second bearing portion 22 is formed in which a radial bearing 27 having a precision bearing is fitted inside the annular projection 26. A male screw groove is formed on the outer periphery of the cap member, which is the second housing member 21, and is screwed into the female screw groove of the first housing member 11 via a large-diameter ring-shaped seal member 28. The first housing member 11 is closed in a state in which a chamber capable of accommodating a viscous liquid is sealed, and the other end of a shaft member 2A (shaft) of the drum 2 described later on the second bearing portion 22 has a small diameter. The bearing is rotatably supported via a ring-shaped seal member 29.

A cylindrical cylindrical wall 2B is formed on the drum 2 so as to extend in the axial direction of the shaft member 2A via a plurality of ribs 2C formed radially from the central shaft member 2A (shaft). An axial groove 2D is provided on the inner peripheral surface of the cylindrical wall 2B. The drum 2 is disposed in the chamber between the first housing 11 and the second housing 21 so that the cylindrical wall 2B faces the inner peripheral surface of the first housing 11.
In the illustrated example, the drum 2 is separated from the shaft member 2A and is configured to be mutually non-rotatable. However, the drum 2 and the shaft member 2A may be integrated.

  The torque adjusting means 31 includes an adjusting ring 32 fitted and fixed to the annular groove 17 outside the small cylindrical wall 16 of the first housing member 11, a vane movement adjusting member 33 fitted to the outer periphery of the adjusting ring 32, and a vane. A pair of vane members 34 arranged in a 180 ° symmetrical position inside the cylindrical wall 2 </ b> B of the drum 2 so as to be connected to the movement adjusting member 33 and movable in the radial direction, and the small cylindrical wall 16 of the first housing member 11. The vane movement adjusting member retaining member 39 is press-fitted and fitted and fixed to the first bearing portion 12.

  That is, the adjustment ring 32 has a predetermined thickness, and has an opening 32A having a substantially horizontally long rectangular shape at the center, and a rotation-preventing protrusion 32B is provided at a vertically symmetrical position inside the opening 32A. It is formed. Then, the adjustment ring 32 itself is fixed so as not to rotate with respect to the small cylindrical wall 16 by fitting the projection 32B into the concave groove 16B formed in the vertically symmetrical position on the outer periphery of the small cylindrical wall 16. It is. Also, the adjustment ring 32 is thin and elastic on both left and right sides by a horizontally long opening 32A, and has a protrusion 32C on the outer surface side thereof. It arrange | positions inside the vane movement adjustment member 33 so that it may engage with the inner peripheral gear part 33A of the other end side inner periphery so that click rotation is possible.

  The vane movement adjusting member 33 is formed with an outer peripheral gear portion 33B that meshes with an adjustment gear 42 of an adjusting operation means 41, which will be described later, on an outer periphery on one end side of the cylinder, and on the inner periphery on the other end side of the cylinder An inner peripheral gear portion 33 </ b> A for engaging the protrusions 32 </ b> C on the left and right sides of the 32 so as to be clickable is formed. Further, symmetrically projecting piece portions 33C are provided at 180 ° symmetrical positions of the cylindrical body of the vane movement adjusting member 33, and projections 33D for engaging with the elongated holes 35 of the vane member 34 are provided on the rear surface side. Is provided.

  The vane member 34 is formed with an arc-shaped outer surface portion 37 that can be brought into contact with and separated from the inner surface of the cylindrical wall 2 </ b> B of the drum 2 on the outer periphery of the arc-shaped base portion 36, and relatively moves along the arc-shaped base portion 36. A long guide hole 35 is formed. The protrusion 33D of the vane movement adjusting member 33 is engaged with the long hole 35, and the vane member 34 is reduced in diameter or moved in the radial direction by clicking rotation of the vane movement adjusting member 33. It is. Further, the vane member 34 itself engages the horizontal locking pieces 38 formed at the upper and lower ends behind the outer surface portion with the horizontal guide frame portions 18A at the upper and lower ends of the protruding wall 18 of the first housing member 11. It is made impossible to rotate by combining.

  The retaining member 39 of the vane movement adjusting member is formed as a fixed bush having a circular flange portion 39A at one end of the cylindrical body, and a plurality of non-rotating projections 39B along the axial direction are formed on the outer periphery of the cylindrical body. Has been. This member 39 is removed from the vane movement adjusting member 33 when the projection 39B of the cylindrical body is press-fitted into the small cylindrical wall 16 of the first housing member 11 inside the outer peripheral gear portion 33B of the vane movement adjusting member 33. Acts as a stop.

  The adjustment operation means 41 changes the facing interval of the vane member 34 with respect to the cylindrical wall 2 </ b> B, and an adjustment shaft 43 constituted by a short axis that is an operation portion of the adjustment operation means 41 is provided in the first housing 11. It is arrange | positioned in the position eccentric with respect to the bearing part 12. That is, the adjustment shaft 43 is provided with a knob 43A at one end thereof, and the D-cut shaft portion 43B formed at the other end is formed at a position eccentric with respect to the first bearing portion 12 of the first housing 11. A D-cut hole 42A in the center of the small-diameter adjusting gear 42 is fitted into the D-cut shaft 43B of the adjusting shaft 43 that is inserted through the opening 19 and protrudes into the interior through a small-diameter seal member 44, and is stopped from the opposite side. The adjustment shaft 43 itself is fixed so as not to be removed from the opening 19 by fitting the ring member 45. The adjusting gear 42 is engaged with the outer peripheral gear portion 33B of the vane movement adjusting member 33.

  Next, an example of the assembly and use operation of the best mode configured as described above will be described. When the apparatus main body 1 is assembled, first, as shown in FIG. The metal bearing 3 is fitted inside the small cylindrical wall 16 of the bottom 15, and then the adjustment ring 32 is fitted on the outer periphery of the small cylindrical wall 16. The protrusion 33D on the protruding piece portion 33C of the vane movement adjusting member 33 is previously engaged with the elongated hole 35 in the base portion 36 of the vane member 34, and the inner peripheral gear portion of the vane movement adjusting member 33 is arranged on the outer periphery of the adjusting ring 32. The members 32 and 33 are prevented from coming off by fitting the 33A side and press-fitting the retaining member 39 of the vane movement adjusting member into the small cylindrical wall 16 of the first housing 11 from the outer peripheral gear portion 33B side.

  An adjustment shaft 43 is inserted through the opening 19 of the first housing 11, and a D-cut at the center of the small-diameter adjustment gear 42 is inserted into a D-cut shaft portion 43 </ b> B of the adjustment shaft 43 protruding into the interior through a small-diameter seal member 44. The adjustment shaft 43 is rotatably fixed by fitting the hole 42A and fitting the retaining ring member 45 from the opposite side.

  Then, one end of the shaft member 2A (shaft) of the drum 2 is inserted into the first bearing portion 12 via the metal bearing 3, and is supported so as to be relatively rotatable. The interior of the first housing member 11 is filled with a viscous liquid (not shown), and the cap member as the second housing member 21 is screwed into the opening 13 of the first housing member 11 through the seal member 28. At this time, the other end of the shaft member 2A (shaft) of the drum 2 has a small-diameter ring-like seal member in the second bearing portion 22 formed by fitting the radial bearing 27 inside the cylindrical wall 26 of the second housing member 21. A bearing is rotatably supported via 29.

  Thus, the shaft member 2A is supported by the bearing in an anti-bluring state at two locations of the first bearing portion 12 of the first housing 11 and the second bearing portion 22 of the second housing 21. The first bearing portion 12 side of the housing 11 has a bottomed structure closed by the bottom portion 15, and the adjusting operation means 41 in the torque adjusting means 31 is a shaft member of the first housing 11 or the second housing 21. Since the viscous fluid sealing member 44 is disposed only at one position on the opposite side, the sealing performance of the viscous fluid is improved.

  Next, the operation will be described. As shown in FIGS. 3 (a), 4 (a), and 5 (a), at the time of the maximum torque, the protruding piece portion of the vane member 34 is placed on the inner surface of the cylindrical wall 2B. Close up. When the knob of the adjustment shaft is rotated clockwise by a predetermined angle from this state, the vane movement adjusting member is rotated counterclockwise, and the protrusion of the vane movement adjusting member is relatively moved along the elongated hole in the base of the vane member. The vane member moves horizontally inward in the radial direction, so that the vane member and the cylindrical wall 2B are separated from each other, and the minimum torque state as shown in FIGS. 3 (b), 4 (b), and 5 (b) is obtained. Migrate to

  At the time of the minimum torque as shown in FIGS. 3B, 4B, and 5B, the arc-shaped outer surface portion 37 of the vane member 34 is separated from the inner surface of the cylindrical wall 2B. When the knob 43A of the adjustment shaft 43 is rotated counterclockwise by a predetermined angle from this state, the vane movement adjusting member 33 rotates clockwise, and the protrusion 33D of the vane movement adjusting member 33 is formed on the base 36 of the vane member 34. The vane member 34 is relatively moved along a certain long hole 35, and the outer surface portion 37 of the vane member 34 and the cylindrical wall 2B are brought into contact with each other by horizontally moving radially outward, and FIG. 3 (a) and FIG. ), And shifts to the maximum torque state as shown in FIG.

  When the knob 43A of the adjustment shaft 43 is rotated, the inner peripheral gear portion 33A of the vane movement adjusting member 33 is engaged with the protrusion 32C of the fixed adjustment ring 32 as shown in FIG. Since the vane movement adjusting member 33 is click-rotated by one pitch with respect to the ring 32, the horizontal movement of the vane member 34 is performed in small increments, and this causes subtle changes due to the change in the facing distance of the vane member 34 to the cylindrical wall 2B. Torque adjustment can be performed reliably.

1 shows a rotary damper with a torque adjustment function in the best mode for carrying out the present invention, in which (a) is a partially cutaway sectional view of a disassembled state viewed from an oblique front side, and (b) is an exploded view viewed from an oblique rear side. It is a partially cutaway sectional view of a state. Similarly, (a) is a longitudinal sectional view of a partially cutout in an assembled state, and (b) is a transverse sectional view of the partially cutout in an assembled state. Similarly, (a) is an AA sectional view in FIG. 2 (a) at the time of maximum torque, and (b) is an AA sectional view in FIG. 2 (a) at the time of minimum torque. Similarly, (a) is a BB cross-sectional view in FIG. 2 (a) at the maximum torque, and (b) is a BB cross-sectional view in FIG. 2 (a) at the minimum torque. Similarly, (a) is a CC cross-sectional view in FIG. 2 (a) at the maximum torque, and (b) is a CC cross-sectional view in FIG. 2 (a) at the minimum torque. Similarly, the rotational movement of the vane movement adjusting member with respect to the fixed adjustment ring in the torque adjusting means will be described, wherein (a) is a partially cutaway sectional view before one pitch click rotation, and (b) is during one pitch click rotation. Partially cutaway sectional view, (a) is a partially cutaway sectional view after one pitch click rotation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Apparatus body 2 ... Drum 2A ... Shaft member (shaft) 2B ... Cylindrical wall 2C ... Rib 2D ... Groove part 3 ... Metal bearing 11 ... 1st housing 12 ... 1st bearing part 12A ... Inner groove 12B ... Concave groove 13 ... Opening part 14 ... Outer cylinder part 15 ... Bottom part 16 ... Cylinder wall 17 ... Groove part 18 ... Projection wall 18A ... Guide frame part 19 ... Opening part 21 ... Second housing 22 ... Second bearing part 23 ... Support hole 24 ... Bottom 25 ... Rib 26 ... Cylinder wall 27 ... Radial bearing 31 ... Torque adjustment means 32 ... Adjustment ring 32A ... Opening 32B ... Protrusion 32C ... Protrusion 33 ... Vane movement adjusting member 33A ... Inner peripheral gear 33B ... Outer peripheral gear 33C ... Projection piece 33D ... Protrusion 34 ... Vane member 35 ... Elongated hole 36 ... Base 37 ... Outer surface 38 ... Locking piece
41 ... Adjusting operation means 42 ... Adjusting gear 42A ... D-cut hole 43 ... Adjusting shaft 43A ... Pinch 43B ... D-cut shaft 44 ... Seal member 45 ... Retaining ring member

Claims (6)

  A first housing member having an opening on one side and a bottom on the other side, the first bearing member being provided on the bottom, and closing the opening of the first housing member And a second housing member provided with a second bearing portion, a first bearing portion of the first housing member and a second bearing portion of the second housing member, and one end thereof. A shaft member provided so that a portion extends outward from the first or second housing member, and an oil chamber defined around the shaft member by the first and second housing members; A drum having a cylindrical wall that is rotatable relative to the first housing member together with the shaft member in the oil chamber, and is supported by the first housing member; It can be moved freely in the direction of contact with the cylindrical wall. And a vane engaged with the vane member so that the interval between the cylindrical wall and the vane member can be changed according to the rotation. A torque adjustment function comprising: a movement adjustment member; and an operation portion of the vane movement adjustment member supported by the first or second housing member at a position eccentric with respect to the shaft member. With rotating damper.   The first housing member has a small cylindrical wall surrounding a part of the shaft member, and the vane movement adjusting member is rotatably supported by the small cylindrical wall. Rotary damper with torque adjustment function as described.   3. A torque adjusting function according to claim 2, wherein an adjustment ring for stopping the rotation of the vane movement adjusting member at a constant pitch is provided on the small cylindrical wall of the first housing member. Rotating damper.   4. The rotation with a torque adjusting function according to claim 1, wherein a bottom portion of the first housing member is closed on an end surface side of the shaft member held by the first bearing portion. damper.   5. The rotary damper with a torque adjusting function according to claim 1, wherein the drum has an oil reservoir on a surface of the cylindrical wall in contact with the vane member.   The operation portion is composed of a short shaft with an operation surface exposed to the outside of the housing member, and rotation transmission for transmitting the rotation of the short shaft to the vane movement adjustment member between the short shaft and the vane movement adjustment member. 6. A rotary damper with a torque adjusting function according to claim 1, wherein a mechanism is interposed.

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