JP2017110675A - Rotary damper and door brake including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary damper capable of easily adjusting torque without limitation of the operation range of the rotary damper while enabling reduction in its width dimension, and a door brake including the rotary damper.SOLUTION: A rotary damper 1 comprises an adjustment torque generation mechanism row 4 and a speed dependent torque generation mechanism row 5 that are juxtaposed in a housing composed of a case 2 and a cap 3. The adjustment torque generation mechanism row 4 includes a first cap bush 41, a cap-side sealing member 42, a shaft 43, a first adjusting rotor 44, a cover ring 45, a second adjusting rotor 46, an adjuster 47 and a case-side seal member 48 that are coaxially housed in an adjustment mechanism row accommodation holder 2b. The speed dependent torque generation mechanism row 5 includes a second cap bush 51, a first speed dependent rotor 52, a second speed dependent rotor 53, an elastic member 54, a holder 55, a cover ring 56 and a case bush 57 that are coaxially housed in a speed dependent mechanism row accommodation holder 2d.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotary damper that provides resistance to rotation of a shaft by torque generated by a viscous fluid existing between torque generation surfaces of a pair of torque generation members, and a door braking device using the rotation damper.

  Conventionally, as this type of rotary damper, for example, there is a rotary damper disclosed in Patent Document 1. The pair of torque generating members provided in the rotary damper includes a first torque generating member having a first torque generating surface and a second torque generating surface having a second torque generating surface that can face the first torque generating surface. It consists of members. One torque generating member is configured as a movable member that is movable in the axial direction with respect to the other torque generating member. The other torque generating member facing the movable member is fitted with an adjuster to form a movement adjusting mechanism, and the other torque generating member moves in the axial direction by the rotation of the adjuster. By this movement, the facing area between the first torque generation surface and the second torque generation surface changes, and the magnitude of torque generated in the pair of torque generation members is adjusted.

  The rotary damper is provided with an automatic torque adjusting mechanism that changes the facing area between the first torque generating surface and the second torque generating surface according to the rotational speed when the shaft is driven to rotate. This automatic torque adjustment mechanism rotates the tubular body attached to the shaft in conjunction with the shaft, thereby allowing the movable member engaged with the tubular body to move in the axial direction against the elastic force of the elastic member. Move to the torque generating member side. This movement is performed in accordance with the rotation speed of the shaft, and due to this movement, the facing area between the torque generation surfaces changes, and a torque corresponding to the rotation speed is generated in the pair of torque generation members.

JP 2013-50117 A

  However, in the conventional rotary damper disclosed in Patent Document 1, a movement adjustment mechanism that adjusts the magnitude of torque generated in the pair of torque generating members, and the pair of torque generating members generate torque corresponding to the rotational speed. An automatic torque adjustment mechanism is provided in series with the shaft axis in series. For this reason, the conventional rotary damper has a large width dimension in the axial direction of the shaft, and requires a large width dimension in the mounting portion. Therefore, the conventional rotary damper is restricted in the object to which it can be attached and cannot be applied in a wide range.

  On the other hand, when the width dimension of the rotary damper is reduced, the relative distance between the first torque generating member and the second torque generating member is shortened. For this reason, when the other torque generating member is moved in the axial direction toward the movable member by the movement adjusting mechanism, the movable range of the movable member is narrowed. Therefore, in the conventional rotary damper, when the width dimension of the rotary damper is reduced, the automatic torque adjustment range by the automatic torque adjustment mechanism is narrowed, and the operation range of the rotary damper is limited.

The present invention has been made to solve such problems,
A housing that is filled with viscous fluid, a shaft that is partly housed in the housing and rotatably supported with respect to the housing, and a torque generating surface that can face each other are coaxially housed in the housing. A rotation damper that provides resistance to rotation of the shaft by torque generated by viscous resistance of the viscous fluid existing between the torque generation surfaces.
The first torque generating member is composed of one first torque generating member and the other first torque generating member. The first torque generating member is rotatably held by the housing, and the other first torque generating member is movable in the axial direction thereof. And a first pair of torque generating members held by the housing so as not to rotate in conjunction with one of the first torque generating members, and a first driven cam portion formed on the other first torque generating member. A first driving cam portion is formed, and when the first driving cam portion rotates, the other first torque generating member is moved in the axial direction via the first driven cam portion, and the first pair of cams is moved. An adjustment torque generation mechanism array that includes an adjuster that changes a facing area of the torque generation surface of the torque generation member, and that generates a first torque whose size is adjusted by the adjuster;
One second torque generating member and the other second torque generating member, one of the second torque generating members being held in the housing so as to be movable in the axial direction and rotatable, and the other second torque generating member Is engaged with a second pair of torque generating members fixed so as not to rotate in conjunction with one second torque generating member, and a second driven cam portion formed on one second torque generating member. A driving cam portion is formed, and the second driving cam portion rotates to transmit the rotation to one second torque generating member via the second driven cam portion, and the one second torque generating member is transferred to the other. The second torque generating member is an elastic member that urges the rotor away from the second torque generating member. The rotational driving force of the rotor is transmitted to one second torque generating member, and the second torque generating member is used as the elastic force of the elastic member. Against other Adjustment torque generation for generating the second torque according to the rotational speed of the rotor by changing the facing area of the torque generation surfaces of the second pair of torque generation members A speed-dependent torque generating mechanism array disposed in the housing in parallel with the mechanism array;
A rotation transmitting member that transmits one rotational driving force to the other between the first torque generating member and the rotor;
The shaft is provided coaxially with one of the first torque generating members or the rotor and rotates in conjunction with the first torque generating member or the rotor.

  In this configuration, when the shaft rotates, one of the first torque generating members or the rotor rotates in conjunction with the shaft. When one of the first torque generating members rotates in conjunction with the shaft, the first pair of torque generating members provided in the adjustment torque generating mechanism row has a size corresponding to the facing area of the torque generating surface adjusted by the adjuster. The first torque is generated. Further, the rotation of one of the first torque generating members is transmitted to the rotor by the rotation transmitting member, and the rotor rotates. When the rotor rotates, the rotational driving force is transmitted to one second torque generating member via the second driving cam portion and the second driven cam portion, and the one second torque generating member becomes the elastic force of the elastic member. Against this, it moves to the other second torque generating member side. Due to this movement, the opposing area of the torque generation surface of the second pair of torque generation members changes, and the second pair of torque generation members provided in the speed-dependent torque generation mechanism row corresponds to the rotational speed of the rotor. A second torque is generated. Therefore, the rotation of the shaft is given resistance by a torque having a magnitude that is a combination of the first torque and the second torque.

  Further, when the rotor rotates in conjunction with the shaft, the rotational driving force is transmitted to one of the second torque generating members via the second driving cam portion and the second driven cam portion, and as described above, the speed-dependent torque is transmitted. In the second pair of torque generating members provided in the generating mechanism row, a second torque corresponding to the rotational speed of the rotor is generated. The rotation of the rotor is transmitted to one first torque generating member by the rotation transmitting member, and one first torque generating member rotates. When one of the first torque generating members rotates, a first torque having a magnitude adjusted by an adjuster is generated in a first pair of torque generating members provided in the adjustment torque generating mechanism row. Accordingly, in this case as well, resistance due to the magnitude of the combined torque of the first torque and the second torque is applied to the rotation of the shaft.

  The adjustment torque generation mechanism row and the speed-dependent torque generation mechanism row are arranged in parallel in the housing. For this reason, the rotational damper according to this configuration has a smaller width dimension in the axial direction of the shaft than the conventional rotational damper in which the movement adjusting mechanism and the automatic torque adjusting mechanism are provided in series with the shaft axis. I can do it. Therefore, a large width dimension is not required for the mounting portion of the rotary damper, and the rotary damper can be installed in a narrow space, and there is no restriction on the object to be mounted, and it can be applied in a wide range. .

  Further, since the adjustment torque generation mechanism row and the speed-dependent torque generation mechanism row are separately and independently arranged, even if the magnitude of the first torque generated in the adjustment torque generation mechanism row is adjusted by the adjuster, The speed-dependent torque generating mechanism train is not affected by the adjustment. For this reason, when the torque is adjusted by the movement adjustment mechanism as in the conventional rotary damper, the automatic adjustment range of the torque by the automatic torque adjustment mechanism is narrowed and the operation range of the rotary damper is limited. In addition, the torque adjustment of the first torque by the adjuster in the adjustment torque generation mechanism row can be simply performed without considering the automatic adjustment of the second torque in the speed-dependent torque generation mechanism row.

  Further, the present invention constitutes a pair of torque generating members in one first torque generating member, the other first torque generating member, and the one second torque generating member and the other second torque generating member. In some cases, the radial positions are shifted so as to face each other due to relative movement in the axial direction, and one row or a plurality of rows are concentrically projected. It is characterized by being.

  According to this configuration, the relative distance between one first torque generating member and the other first torque generating member, and the relative distance between one second torque generating member and the other second torque generating member change. The magnitude of the first torque generated by the first pair of torque generating members in the adjustment torque generating mechanism row and the speed-dependent torque by changing the areas of the torque generating surfaces facing each other of the protruding plates. The magnitude of the second torque generated by the second pair of torque generating members in the generation mechanism row is adjusted.

  Further, the present invention is characterized in that the other second torque generating member is formed by shaping the inner wall of the housing facing the one second torque generating member.

  According to this configuration, since the other second torque generating member is formed integrally with the housing, the width of the rotary damper can be further reduced, and the number of components can be reduced to reduce the price of the rotary damper. I can do it.

  Further, the present invention is characterized in that the rotation transmitting member is accommodated in the housing, and the rotational driving force is transmitted in the housing.

  According to this configuration, since transmission of power between the two rotation axes of the first torque generating member and the rotation axis of the rotor is performed in the housing, the seal member of the rotation shaft is between the two axes. Unlike the case where power is transmitted outside the housing, it is sufficient to provide one at the location where the shaft is exposed outside the housing. Therefore, the rotational resistance generated by the seal member of the rotating shaft and transmitted via the viscous fluid can be minimized. Therefore, it is possible to prevent a phenomenon in which the torque applied to the shaft does not drop due to the rotational resistance due to the seal member of the rotary shaft when setting the low torque of the rotary damper in which the resistance applied to the rotation of the shaft is set to be small.

  Further, according to the present invention, the rotation transmission member includes a first transmission portion formed integrally with one first torque generating member and a second transmission portion formed integrally with the rotor. Features.

  According to this configuration, the rotation transmission member is integrally formed with the first torque generation member and the rotor, and the number of components is reduced, so that the rotation damper can be reduced in size and price.

  Further, the present invention is characterized in that the first transmission part and the second transmission part are constituted by gears meshing with each other, and the gear ratio is set to a predetermined value.

  According to this configuration, the rotational speed of one of the first torque generating members or the rotor increases or decreases according to the gear ratio set for the gear. For this reason, it is possible to expand the adjustment range of the magnitude of the first torque generated by the adjustment torque generation mechanism train or the magnitude of the second torque generated by the speed-dependent torque generation mechanism train.

  Further, the present invention provides any one of the above rotary dampers, in which the adjustment torque generation mechanism row and the speed-dependent torque generation mechanism row are arranged in the door opening / closing direction and the housing is fixed, and the shaft exposed from the housing And a one-way clutch that is detachably attached to the front and back sides, and when the door is braked in the reverse direction, the arrangement of the adjustment torque generating mechanism row and the speed dependent torque generating mechanism row is reversed in the door opening / closing direction. Thus, the housing is fixed, and the one-way clutch is configured to be a door braking device that is attached to the shaft with its front and back reversed.

  According to this configuration, a door braking device that can apply braking to the movement of the door both in the case of opening the door in one direction and in the opposite direction is easily realized by using the same member. I can do it.

  According to the present invention, the width of the shaft in the axial direction can be reduced, and the torque adjustment can be simplified without limiting the automatic adjustment range of the torque and limiting the operation range of the rotary damper. It is possible to provide a rotary damper that can be applied to the door and a door braking device using the same.

It is the disassembled perspective view which looked at the door braking device using the rotation damper by one embodiment of the present invention from the one side. It is the disassembled perspective view which looked at the door braking device using the rotation damper by one embodiment from the opposite side. It is sectional drawing of the door braking device using the rotation damper by one Embodiment. (A) is an enlarged perspective view of the second adjuster rotor and adjuster seen from one side surface shown in FIG. 1, and (b) is the second adjuster rotor and adjuster seen from the opposite side surface shown in FIG. FIG. It is sectional drawing of the door braking device using the rotation damper by one Embodiment in the state in which the 2nd adjustment rotor was brought closest to the 1st adjustment rotor by rotating an adjuster. (A) is an enlarged perspective view of the first speed-dependent rotor and the second speed-dependent rotor seen from one side face shown in FIG. 1, and (b) is a first view seen from the opposite side face shown in FIG. It is an expansion perspective view of a 1 speed dependent rotor and a 2nd speed dependent rotor. Sectional drawing of the door braking device using the rotation damper by one Embodiment in the state in which the 2nd speed dependence rotor approached the torque generation part formed in the speed dependence mechanism row | line | column accommodation holder by rotation of a 1st speed dependence rotor. It is. (A) is a side view of a state where a door braking device using a rotary damper according to one embodiment is attached to a right-open door, and (b) is a side view of a state attached to a left-open door. is there. (A)-(d) is a side view of the door brake device which shows the attachment procedure in the case of attaching the door brake device using the rotation damper by one Embodiment to a reverse opening door.

  Next, the form for implementing the rotation damper by this invention and the door braking device using the same is demonstrated.

  FIG. 1 is an exploded perspective view of a door braking device 11 viewed from one side of a door braking device 11 using a rotary damper 1 according to an embodiment of the present invention, and FIG. 2 is a door viewed from the opposite side. 2 is an exploded perspective view of the braking device 11. FIG. FIG. 3 is a cross-sectional view of the door braking device 11.

  The rotary damper 1 is configured by arranging an adjustment torque generation mechanism row 4 and a speed-dependent torque generation mechanism row 5 in parallel in a housing formed by covering the case 2 with a cap 3. The case 2 and the cap 3 are each molded as a single-piece product from a synthetic resin material, but may be formed of metal. The attachment of the cap 3 to the case 2 is performed by bringing the joints 3a and 2a of the cap 3 and the case 2 into contact with each other and fastening with four screws 7 at the four corners. The inside of the housing is filled with a viscous fluid such as silicone oil. A unit seal member 6 made of an O-ring is sandwiched between the cap 3 and the case 2, and this unit seal member 6 prevents leakage of viscous fluid filled in the housing.

  The adjustment torque generation mechanism row 4 includes a first cap bush 41, a cap side seal member 42, a shaft 43, a first adjustment rotor 44, a retaining ring 45, a second adjustment rotor 46, an adjuster 47, and a case side seal member 48. Each member is accommodated coaxially in the adjustment mechanism row accommodation holder 2b formed to be recessed inside the case 2.

  The shaft 43 is made of a synthetic resin material or a metal material, and is formed in a cylindrical shape including a thick large diameter portion 43a and a thin small diameter portion 43b, and both sides of the end portion on the small diameter portion 43b side of the large diameter portion 43a are cut in parallel. Thus, a flat portion 43c is formed. As for this shaft 43, a part of large diameter part 43a is exposed outside a housing, and the remaining part is accommodated in a housing. The cap 3 is formed with a cylindrical hole 3 b having an inner diameter large enough to fit the first cap bush 41 and the cap-side seal member 42. The large-diameter portion 43a of the shaft 43 is passed through the first cap bush 41 and the cap-side seal member 42 fitted in the cylindrical hole 3b, and is exposed to the outside of the housing. The first cap bush 41 rotatably supports the large-diameter portion 43a of the shaft 43 with respect to the housing, and the cap-side seal member 42 prevents the viscous fluid filled in the housing from leaking from the cylindrical hole 3b.

  A one-way clutch 8 is coaxially fixed to the large-diameter portion 43 a of the shaft 43 exposed to the outside of the housing, and one-way rotation is transmitted to the shaft 43 by the one-way clutch 8. The one-way clutch 8 is attached to the shaft 43 so as to be detachable and reversible by inserting a large-diameter portion 43a into the inner diameter of the opening at the center. Further, the frame 9 is attached to the front side of the cap 3 with two screws 10 so as to cover the side portion of the one-way clutch 8, and the one-way clutch 8 is prevented from coming off the shaft 43. The rotary damper 1, the one-way clutch 8 and the frame 9 constitute a door braking device 11.

  The shaft 43 has a flat portion 43c inside the housing fitted into a rectangular mounting hole 44a formed at the center of the first adjusting rotor 44, and a retaining ring made of an E-ring on a small diameter portion 43b protruding from the first adjusting rotor 44. 45 is fitted. A spur gear 44 b is formed on the outer periphery surrounding the rectangular mounting hole 44 a of the first adjusting rotor 44. The retaining ring 45 prevents the shaft 43 from coming out of the rectangular mounting hole 44a. Further, when the flat portion 43 c is fitted into the rectangular mounting hole 44 a, the first adjusting rotor 44 is rotated in conjunction with the shaft 43, and the rotation of the shaft 43 is transmitted to the first adjusting rotor 44. . The small diameter portion 43b of the shaft 43 is set to a size that can be accommodated in the inner diameter portion 47a of the adjuster 47 whose one end is closed, and is fitted to the inner diameter portion 47a of the adjuster 47 and is rotatably supported by the inner diameter portion 47a.

  The second adjusting rotor 46 has a guide groove 46a formed on the outer periphery thereof in parallel to the axial direction. The guide groove 46a is fitted to a protrusion 2c formed to protrude in parallel to the axial direction on the inner periphery of the adjustment mechanism row storage holder 2b. Since the guide groove 46a is slidably fitted to the protrusion 2c in the axial direction, the second adjusting rotor 46 is movable in the axial direction and does not rotate in conjunction with the first adjusting rotor 44. , Held in the housing. On the other hand, the first adjusting rotor 44 is rotatably held by the housing by being provided in conjunction with the shaft 43 as described above.

  The first adjusting rotor 44 and the second adjusting rotor 46 constitute a first pair of torque generating members that are provided with torque generating surfaces that can face each other and are coaxially accommodated in the housing. The first adjusting rotor 44 constitutes one first torque generating member of the first pair of torque generating members, and a plurality of concentric rows, axial directions, and circumferential directions are concentrically formed on a side surface facing the second adjusting rotor 46. A projecting plate 44c (see FIG. 2) is formed so as to extend annularly and project. The central protruding plate 44c is formed by cutting out a part in the circumferential direction. The second adjusting rotor 46 constitutes the other first torque generating member of the first pair of torque generating members, and is arranged on the side surface facing the first adjusting rotor 44 in a plurality of concentric rows, in the axial direction and in the circumferential direction. A protruding plate 46b (see FIG. 1) is formed so as to extend in a ring shape and protrude. The protruding plates 44c and 46b are formed at equal intervals in the radial direction of the first adjustment rotor 44 and the second adjustment rotor 46, and are provided with their radial positions shifted so as to face each other by relative movement in the axial direction. The surfaces that are alternately opposed to each other and that face each other constitute a torque generation surface.

  According to this configuration, the relative distance between the first adjustment rotor 44 and the second adjustment rotor 46 changes, and the areas of the torque generation surfaces facing each other of the projecting plates 44c and 46b change. The magnitude of the first torque generated by the first pair of torque generating members in the row 4 is adjusted.

  In the present embodiment, the projecting plates 44c and 46b are concentrically formed in a plurality of rows and projecting annularly in the axial direction and the circumferential direction, but projecting in a single row. Alternatively, it may be formed so as to be opposed by relative movement in the axial direction. Moreover, it does not necessarily need to be formed in an annular shape, and may be any shape as long as it is a semi-annular shape or a shape that extends in the axial direction and the circumferential direction. The first adjustment rotor 44, the second adjustment rotor 46, and the adjuster 47 are each molded from a synthetic resin material as an integrally molded product, but may be formed of metal.

  As shown in FIG. 4, first driven cam portions 46 c are formed so as to protrude from two opposing portions of the inner diameter portion of the second adjust rotor 46. 2A is an enlarged perspective view of the second adjusting rotor 46 and the adjuster 47 viewed from one side surface shown in FIG. 1, and FIG. 2B is a view viewed from the opposite side surface shown in FIG. FIG. 6 is an enlarged perspective view of a second adjust rotor 46 and an adjuster 47. The first driven cam portion 46c is inclined in the circumferential direction as it is away from the adjuster 47 in the axial direction and has a spiral shape with a width, and the side surface rising from the inner diameter portion of the second adjust rotor 46 is the first driven cam. A surface 46c1 is formed.

  In addition, first driving cam portions 47b are formed in a groove shape at two opposing positions of the outer diameter portion of the adjuster 47. The first driving cam portion 47b is inclined in the circumferential direction as it approaches the second adjusting rotor 46 in the axial direction, has a spiral concave shape with a width, and the side surface falling from the outer diameter portion of the adjuster 47 is the first driving cam portion 47b. A cam surface 47b1 is formed. The concave shape of the first driving cam portion 47b is a shape that accommodates the convex shape of the first driven cam portion 46c, and the first driving cam portion 47b and the first driven cam portion 46c are fitted in contact with each other. Set to dimensions. Further, the inner diameter portion of the second adjusting rotor 46 where the first driven cam portion 46c is formed and the outer diameter portion of the adjuster 47 where the first driving cam portion 47b is formed are set to dimensions that fit in contact with each other. Has been.

  The adjuster 47 is accommodated in the adjustment mechanism row accommodation holder 2b with the side surface of the disc-shaped adjustment portion 47c exposed to the outside of the housing. At this time, a case-side seal member 48 made of an O-ring is fitted into the groove 47e between the adjustment portion 47c and the flange portion 47d, and the opening formed in the adjustment mechanism row storage holder 2b through which the adjustment portion 47c is exposed. The viscous fluid is prevented from leaking from the part. A groove 47f into which a tool such as a hand or a driver is inserted is formed on the side surface of the adjustment portion 47c exposed to the outside of the housing, and the adjuster 47 is rotated within a certain range by using the groove 47f.

  The second follower rotor 46 is accommodated in the housing as shown in FIG. 3, with the first driven cam portion 46c engaged with the first driving cam portion 47b of the adjuster 47 accommodated in the adjusting mechanism row accommodating holder 2b. . In this state, when the first driving cam surface 47b1 of the first driving cam portion 47b comes into contact with the first driven cam surface 46c1 of the first driven cam portion 46c, and the adjuster 47 is rotated using the groove 47f, The first driving cam surface 47b1 pushes the first driven cam surface 46c1 in the axial direction. As a result, the guide groove 46a of the second adjustment rotor 46 is guided by the protrusion 2c of the adjustment mechanism row housing holder 2b, and the second adjustment rotor 46 slides in the axial direction.

  The adjuster 47 moves the second adjusting rotor 46 in the axial direction as described above by rotating the first driving cam portion 47b. As a result of this movement, the area where the projecting plates 44 c and 46 b formed on the first adjustment rotor 44 and the second adjustment rotor 46 face each other changes, and the first adjustment rotor 44 and the second adjustment rotor 46 constitute the first adjustment rotor 46. The opposing area of the torque generating surface in the pair of torque generating members is adjusted. Therefore, in the adjustment torque generating mechanism row 4 including the first pair of torque generating members, the size is adjusted by the adjuster 47 due to the viscous resistance (shear resistance) of the viscous fluid existing between the projecting plates 44c and 46b. A first torque is generated.

  FIG. 3 shows a state in which the second adjustment rotor 46 is closest to the storage unit bottom surface side of the adjustment mechanism row storage holder 2 b and is farthest from the first adjustment rotor 44. In this state, the opposing areas of the protruding plates 44c and 46b are substantially zero or close to zero, the shear resistance of the viscous fluid is reduced, and the first torque generated in the first pair of torque generating members is minimized. It becomes.

  The sectional view of the door braking device 11 of FIG. 5 shows that the second adjusting rotor 46 is moved in the axial direction by rotating the adjuster 47, and the second adjusting rotor 46 is moved to the bottom of the storage portion of the adjusting mechanism row storage holder 2b. This shows a state that is farthest from the side and is closest to the first adjusting rotor 44. 5 that are the same as or correspond to those in FIG. 3 are assigned the same reference numerals, and descriptions thereof are omitted. In this state, the opposing areas of the projecting plates 44c and 46b are maximized, the shear resistance of the viscous fluid is increased, and the first torque generated in the first pair of torque generating members is maximized.

  The speed-dependent torque generation mechanism row 5 includes a second cap bush 51, a first speed-dependent rotor 52, a second speed-dependent rotor 53, an elastic member 54, a holder 55, a retaining ring 56, and a case bush 57. Each member is accommodated coaxially in a speed-dependent mechanism row storage holder 2d formed inwardly and with its axis parallel to the axis of the adjustment torque generation mechanism row 4.

  A spur gear 52 a that meshes with a spur gear 44 b formed on the outer periphery of the first adjusting rotor 44 is formed on the outer periphery of the first speed-dependent rotor 52. The gear ratio of the spur gears 44b and 52a is set to a predetermined value. A spur gear 44b formed on the outer periphery of the first adjusting rotor 44 is a first transmission portion formed integrally with the first adjusting rotor 44, and a spur gear 52a formed on the outer periphery of the first speed-dependent rotor 52 is a first gear. A second transmission unit formed integrally with the speed-dependent rotor 52 is configured, and the first transmission unit and the second transmission unit are arranged between one of the first adjustment rotor 44 and the first speed-dependent rotor 52. A rotation transmitting member for transmitting the rotational driving force to the other is configured. In this embodiment, this rotation transmission member is accommodated in the housing, and transmission of the rotational driving force between the first adjusting rotor 44 and the first speed-dependent rotor 52 is performed in the housing.

  One end of the shaft 52b protruding from the center of the first speed-dependent rotor 52 is fitted with a second cap bush 51 made of a bearing or a sliding member, and the second cap bush 51 is fitted into the cylindrical recess 3c of the cap 3. As a result, the cap 3 is rotatably mounted and pivotally supported. The other end of the shaft 52b of the first speed-dependent rotor 52 is inserted into the inner diameter portion of the second speed-dependent rotor 53, and is opposite to the side surface of the second speed-dependent rotor 53 that faces the first speed-dependent rotor 52. Protrusively on the side. A cylindrical bush 52d (see FIG. 2) formed at the other end of the protruding shaft 52b is fitted with a case bush 57 made of a bearing, a sliding member or the like. The case bush 57 further depends on the speed of the case 2. The protrusions 2e formed on the mechanism row storage holder 2d are rotatably fitted. The first speed-dependent rotor 52 is rotatably supported on the housing by the second cap bush 51 and the case bush 57, and rotates by receiving a rotational driving force transmitted from the first adjusting rotor 44 by this shaft support.

  Instead of using the case bush 57, the cylindrical recess 52d may be slidably contacted with the protrusion 2e so that the first speed-dependent rotor 52 is rotatably supported on the housing.

  As shown in FIG. 6, a second driving cam portion 52c is formed at the other end of the shaft 52b. 1A is an enlarged perspective view of the first speed-dependent rotor 52 and the second speed-dependent rotor 53 viewed from one side shown in FIG. 1, and FIG. FIG. 4 is an enlarged perspective view of a first speed-dependent rotor 52 and a second speed-dependent rotor 53 as viewed from the side. In addition, second driven cam portions 53 a that engage with the second driving cam portion 52 c are formed at two opposing positions on the inner diameter portion of the second speed-dependent rotor 53. The second driven cam portion 53 a has a second speed-dependent rotor 53 in an isosceles triangle shape having a side surface facing the first speed-dependent rotor 52 of the second speed-dependent rotor 53 as a vertex and an opposite side surface as a base. It protrudes from the inner diameter part. The side surface of the second driven cam portion 53a rising from the inner diameter portion of the second speed-dependent rotor 53 forms a second driven cam surface 53a1.

  Four adjacent second driving cam portions 52c are formed so as to protrude from the outer periphery on the other end side of the shaft 52b. The two adjacent second driving cam portions 52c are provided with second driving cam surfaces 52c1 facing the second driven cam surfaces 53a1 on both sides of the second driven cam portion 53a on the side surfaces rising from the outer periphery of the shaft 52b. ing. An isosceles triangular space corresponding to the outer shape of the second driven cam portion 53a is formed on the outer periphery of the shaft 52b between the pair of inclined second driving cam surfaces 52c1.

  The outer periphery of the other end of the shaft 52b and the inner diameter portion of the second speed-dependent rotor 53 are set to dimensions that fit each other when housed in the housing, and the second speed-dependent rotor 53 is pivoted to the inner diameter portion. By inserting the other end of 52b, it is hold | maintained at a housing so that the movement to the axial direction and rotation are possible. When the other end of the shaft 52b is inserted and fitted into the inner diameter portion of the second speed-dependent rotor 53, the second driving cam portion 52c and the second driven cam portion 53a are engaged. The rotation of the first speed-dependent rotor 52 is transmitted to the second speed-dependent rotor 53 by the second driving cam surface 52c1 pushing the second driven cam surface 53a1 by this engagement. At this time, the pressure by which the second driving cam surface 52c1 presses the second driven cam surface 53a1 due to the rotational torque of the first speed-dependent rotor 52 depends on the inclinations of the second driving cam surface 52c1 and the second driven cam surface 53a1. It is converted into a force in two directions, that is, the rotational direction of the first speed-dependent rotor 52 and its axial direction. The second speed-dependent rotor 53 rotates by the force in the rotation direction, and moves in the axial direction by the force in the axial direction.

  The second speed-dependent rotor 53 is formed with an accommodating portion 53c formed by being surrounded by the protruding plate 53b on the side surface opposite to the side surface facing the first speed-dependent rotor 52. One end of the elastic member 54 made of a compression coil spring is accommodated in the accommodating portion 53c. Further, as shown in FIG. 3, a holder 55 is attached to the tip end of the other end of the first speed-dependent rotor 52 whose diameter of the shaft 52 b is narrowed by a concentric retaining ring 56. One end portion of the elastic member 54 is supported on the bottom surface of the housing portion 53c, and the other end portion is supported on the side surface of the holder 55 facing the bottom surface of the housing portion 53c. By this elastic member 54, the holder 55 is pressed against the concentric retaining ring 56 side, and the second speed-dependent rotor 53 is pressed against the first speed-dependent rotor 52 side. Accordingly, the first speed-dependent rotor 52, the second speed-dependent rotor 53, the holder 55, and the elastic member 54 rotate integrally with the first speed-dependent rotor 52.

  Further, the speed-dependent mechanism row storage holder 2d of the case 2 is formed with a protruding plate 2f that constitutes a torque generating portion 2g. The torque generator 2g is formed by shaping the inner wall of the case 2 facing the second speed-dependent rotor 53, and is fixed so as not to rotate in conjunction with the second speed-dependent rotor 53. The projecting plates 2f are concentrically formed in a plurality of rows, projecting annularly in the axial direction and the circumferential direction, and partially cut away in the circumferential direction. Further, the projecting plates 53b formed on the side surfaces of the second speed-dependent rotor 53 facing the torque generating portion 2g also project in a concentric manner in a plurality of rows, in an annular shape in the axial direction and in the circumferential direction.

  The second speed-dependent rotor 53 and the torque generating portion 2g constitute a second pair of torque generating members that have torque generating surfaces that can face each other and are accommodated coaxially in the housing. The second speed-dependent rotor 53 constitutes one second torque generating member of the second pair of torque generating members, and the torque generating portion 2g is the other second torque generating member of the second pair of torque generating members. Configure. The protruding plates 53b and 2f are formed at equal intervals in the radial direction of the second speed-dependent rotor 53 and the torque generating portion 2g, and are provided with their radial positions shifted so as to face each other by relative movement in the axial direction. The surfaces that are alternately opposed to each other and that face each other constitute a torque generation surface. According to this configuration, the relative distance between the second speed-dependent rotor 53 and the torque generating portion 2g is changed, and the areas of the torque generating surfaces facing each other of the protruding plates 53b and 2f are changed. The magnitude of the second torque generated by the torque generating member is adjusted.

  The protruding plates 53b and 2f are also concentrically extended in a plurality of rows, in the axial direction and in the circumferential direction, like the protruding plates 44c and 46b constituting the first pair of torque generating members. It is formed so as to protrude, but it may be configured to extend so as to protrude in one row and to be opposed by relative movement in the axial direction. Moreover, it does not necessarily need to be formed in an annular shape, and may be any shape as long as it is a semi-annular shape or a shape that extends in the axial direction and the circumferential direction. Moreover, although the 1st speed dependence rotor 52, the 2nd speed dependence rotor 53, and the holder 55 are each shape | molded as a one-piece molded product from a synthetic resin material, you may form with a metal.

  The elastic member 54 biases the second speed-dependent rotor 53 toward the first speed-dependent rotor 52 that is away from the torque generator 2g. The rotational driving force of the first speed-dependent rotor 52 is transmitted to the second speed-dependent rotor 53 as described above by the engagement of the second driving cam portion 52c and the second driven cam portion 53a. The elastic member 54 is moved toward the torque generator 2g against the elastic force. By this movement, the area where the projecting plates 53b and 2f formed on the second speed-dependent rotor 53 and the torque generating portion 2g face each other changes, and the area where the torque generating surfaces of the second pair of torque generating members face each other changes. To do. Therefore, in the speed-dependent torque generating mechanism row 5, the second torque corresponding to the rotational speed of the first speed-dependent rotor 52 is generated by the shear resistance of the viscous fluid existing between the projecting plates 53b and 2f.

  In the stationary state of the first speed-dependent rotor 52 shown in FIG. 3, the second speed-dependent rotor 53 is at a position farthest from the torque generating portion 2g formed by the protruding plate 2f, with the elastic member 54 extending most. The side end surface of the second speed-dependent rotor 53 contacts the side end surface of the first speed-dependent rotor 52. In this state, the opposing areas of the projecting plates 53b and 2f are substantially zero or close to zero, the shear resistance of the viscous fluid is reduced, and the second torque generated in the second pair of torque generating members is minimized. It becomes.

  Due to the rotation of the first speed-dependent rotor 52, the second speed-dependent rotor 53 moves against the elastic force of the elastic member 54 from this stationary state. When the rotational speed of the first speed-dependent rotor 52 is slow and the pressure by which the second driving cam portion 52c pushes the second driven cam portion 53a in the axial direction is smaller than the elastic force of the elastic member 54, the second speed-dependent rotor 53 Does not move from the rest position. However, when the rotational speed of the first speed-dependent rotor 52 increases and the pressure by which the second driving cam portion 52c pushes the second driven cam portion 53a in the axial direction overcomes the elastic force of the elastic member 54, the second speed-dependent rotor. 53 moves against the elastic force of the elastic member 54.

  Finally, the second speed-dependent rotor 53 makes a transition to the state closest to the torque generator 2g formed by the protruding plate 2f shown in FIG. In FIG. 7, parts that are the same as or correspond to those in FIG. In this state, since the full lengths of the projecting plates 53b and 2f are opposed to each other, the opposing area of the torque generating surface is maximized, the shear resistance of the viscous fluid is increased, and the second pair of torque generating members generated. The torque of 2 is the maximum.

  In the configuration of the rotary damper 1 according to this embodiment, when the shaft 43 rotates, the first adjust rotor 44 rotates in conjunction with the shaft 43. When the first adjusting rotor 44 rotates in conjunction with the shaft 43, the first pair of torque generating members provided in the adjustment torque generating mechanism row 4 corresponds to the facing area of the torque generating surface adjusted by the adjuster 47. A first torque of magnitude is generated. The rotation of the first adjusting rotor 44 is transmitted to the first speed-dependent rotor 52 by the meshing of the spur gears 44b and 52a, and the first speed-dependent rotor 52 rotates. When the first speed-dependent rotor 52 rotates, the rotational driving force is transmitted to the second speed-dependent rotor 53 via the second driving cam portion 52c and the second driven cam portion 53a, and the second speed-dependent rotor 53 is elastic member. It moves to the torque generating part 2g side against the elastic force of 54. Due to this movement, the opposing area of the torque generating surfaces of the second pair of torque generating members changes, and in the second pair of torque generating members provided in the speed dependent torque generating mechanism row 5, the first speed dependent rotor 52. A second torque corresponding to the rotation speed is generated. Accordingly, the rotation of the shaft 43 is given resistance by a torque having a magnitude that is a combination of the first torque and the second torque.

  The adjustment torque generation mechanism row 4 and the speed-dependent torque generation mechanism row 5 are arranged in parallel in the housing. For this reason, the rotational damper 1 according to the present embodiment has a width in the axial direction of the shaft 43 as compared with the conventional rotational damper in which the movement adjusting mechanism and the automatic torque adjusting mechanism are provided in series with the shaft axis. The dimensions can be reduced. Accordingly, the mounting portion of the rotary damper 1 does not need a large width dimension, and the rotary damper 1 can be installed in a narrow space and there is no restriction on the object to be mounted, so that it can be applied in a wide range. become.

  Further, since the adjustment torque generation mechanism row 4 and the speed-dependent torque generation mechanism row 5 are separately and independently arranged, the magnitude of the first torque generated in the adjustment torque generation mechanism row 4 is adjusted by the adjuster 47. However, the speed-dependent torque generation mechanism train 5 is not affected by the adjustment. For this reason, when the torque is adjusted by the movement adjustment mechanism as in the conventional rotary damper, the automatic adjustment range of the torque by the automatic torque adjustment mechanism is narrowed and the operation range of the rotary damper is limited. Further, the torque adjustment of the first torque by the adjuster 47 in the adjustment torque generation mechanism row 4 can be simply performed without considering the automatic adjustment of the second torque in the speed dependent torque generation mechanism row 5.

  Further, according to the rotary damper 1 according to the present embodiment, the torque generating portion 2g formed by the protruding plate 2f is formed integrally with the case 2, so that the width dimension of the rotary damper 1 can be further reduced. Thus, the number of components can be reduced, and the price of the rotary damper 1 can be reduced. Further, according to the rotary damper 1 according to the present embodiment, the rotation transmission member is integrally formed with the first adjusting rotor 44 and the first speed-dependent rotor 52, and the number of components is reduced, so that the rotary damper 1 can be reduced in size and The price can be reduced. Further, according to the rotary damper 1 according to the present embodiment, the rotational speed of the first speed-dependent rotor 52 is increased or decreased according to the gear ratio set for the spur gears 44b and 52a. For this reason, the adjustment range of the magnitude | size of the 2nd torque produced | generated by the speed dependence torque production | generation mechanism row | line 5 can be expanded.

  Further, according to the rotary damper 1 according to the present embodiment, the transmission of power between the two shafts of the rotating shaft of the first adjusting rotor 44 and the rotating shaft of the first speed-dependent rotor 52 is transmitted to each spur gear 44b in the housing. , 52a. Therefore, unlike the case where power is transmitted between the two shafts outside the housing, the seal member for the rotating shaft is a cap-side seal member 42 provided at a location where the shaft 43 coaxial with the first adjusting rotor 44 is exposed to the outside of the housing. One is enough. Accordingly, it is possible to minimize the rotational resistance generated by the viscous fluid that is generated by the seal member of the rotary shaft and is filled in the housing. Therefore, it is possible to prevent the occurrence of a phenomenon in which the torque applied to the shaft 43 does not drop due to the rotational resistance by the seal member of the rotary shaft when setting the low torque of the rotary damper 1 in which the resistance applied to the rotation of the shaft 43 is set to be small. become. If the rotary shafts of the first adjusting rotor 44 and the first speed-dependent rotor 52 are projected out of the housing and the rotational driving force is transmitted outside the housing, the rotary shafts are projected to two locations that project out of the housing. A rotating shaft sealing member is required, and the rotational resistance increases, so that the torque applied to the shaft 43 does not fall down.

  As shown in the side view of FIG. 8, for example, the door braking device 11 configured by using the above-described rotary damper 1 includes the shaft 43 and the shaft 5 a of the speed-dependent torque generating mechanism row 5. The adjustment torque generation mechanism row 4 and the speed-dependent torque generation mechanism row 5 are arranged side by side in the opening / closing direction of the door 21, and the housing of the rotary damper 1 is fixed to the upper corner of the door 21. In the figure, the illustration of the frame 9 is omitted, and the same parts as those in FIG. A rack gear 23 is attached to the lower surface of the rail 22 provided above the door 21, and the gear formed on the outer periphery of the one-way clutch 8 is meshed with the rack gear 23 by a rack and pinion method.

  In the figure (a), the door brake device 11 is fixed to the left corner of the upper end of the door 21, and when the door brake device 11 is opened to the right in the direction of arrow A (when the door is opened), the one-way clutch 8 is idled and lightly opened. When moving in the reverse direction (when the door is closed), the one-way clutch 8 is locked and the shaft 43 is rotated to brake the opening and closing of the door 21. When the door 21 is opened leftward in the direction indicated by the arrow B in the reverse direction shown in FIG. 4B, the door braking device 11 is arranged with the adjustment torque generation mechanism row 4 and the speed-dependent torque generation mechanism row 5. Is reversed in the opening / closing direction of the door 21 as follows and fixed to the right corner of the upper end of the door 21.

  When the door 21 is braked in the reverse direction, in the initial arrangement of the adjustment torque generation mechanism row 4 and the speed-dependent torque generation mechanism row 5 shown in FIG. Remove as shown. Next, the housing is turned 180 ° around the shaft 5a of the speed-dependent torque generating mechanism row 5 as indicated by an arrow in the figure, and as shown in FIG. The arrangement with the torque generation mechanism row 5 is reversed in the opening / closing direction of the door 21. Finally, the front and back of the one-way clutch 8 are reversed and the one-way clutch 8 is attached to the shaft 43 as shown in FIG.

  According to such a door braking device 11 according to the present embodiment, it is possible to apply braking to the movement of the door 21 both when the door 21 is opened in one direction and when the door 21 is opened in the opposite direction. The door brake device 11 can be easily realized by using the same member.

  In the above embodiment, the case where the shaft 43 is provided coaxially with the first adjustment rotor 44 and the shaft 43 rotates in conjunction with the first adjustment rotor 44 has been described. However, the shaft 43 may be provided coaxially with the first speed-dependent rotor 52 so that the shaft 43 rotates in conjunction with the first speed-dependent rotor 52.

  In this case, when the first speed-dependent rotor 52 rotates in conjunction with the shaft 43, the rotational driving force is transmitted to the second speed-dependent rotor 53 via the second driving cam portion 52c and the second driven cam portion 53a. As described above, in the second pair of torque generating members provided in the speed dependent torque generating mechanism row 5, the second torque corresponding to the rotational speed of the first speed dependent rotor 52 is generated. The rotation of the first speed-dependent rotor 52 is transmitted to the first adjusting rotor 44 by the spur gears 52a and 44b, and the first adjusting rotor 44 rotates. When the first adjusting rotor 44 rotates, a first torque having a magnitude adjusted by the adjuster 47 is generated in the first pair of torque generating members provided in the adjustment torque generating mechanism row 4. Accordingly, in this case as well, the rotation of the shaft 43 is given resistance by a torque having a magnitude that is a combination of the first torque and the second torque.

  At this time, the rotational speed of the first adjusting rotor 44 is increased or decreased according to the gear ratio set for the spur gears 44b and 52a. For this reason, the adjustment range of the magnitude | size of the 1st torque produced | generated by the adjustment torque production | generation mechanism row | line 4 can be expanded.

  In the above-described embodiment, the case where the rotation transmission member that transmits one rotational driving force to the other between the first adjusting rotor 44 and the first speed-dependent rotor 52 is constituted by the spur gears 44b and 52a has been described. . However, the rotation transmission member may not be the spur gears 44b and 52a but may be configured with a gear specification such as a helical gear. Moreover, it is not limited to a gear, For example, you may make it comprise with a friction wheel, a timing belt, a V belt, etc.

  In each of such configurations, the same effects as those of the above-described embodiment can be obtained.

  The rotary damper 1 and the door braking device 11 according to the present invention can be widely used for hanging doors, sliding doors, partitions, roll screens, manual shutters, office automation equipment, and the like.

  DESCRIPTION OF SYMBOLS 1 ... Rotary damper, 2 ... Case, 2a, 3a ... Joint part, 2b ... Adjustment mechanism row | line | column accommodation holder, 2c ... Projection, 2d ... Speed dependence mechanism row | line | column accommodation holder, 2e ... Protrusion, 2f, 44c, 46b, 53b ... Projection plate, 2g ... torque generating part (the other second torque generating member), 3 ... cap, 3b ... cylindrical hole, 3c, 47a ... cylindrical recess, 4 ... adjusting torque generating mechanism row, 5 ... speed-dependent torque generating mechanism Row, 5a ... Speed dependent torque generating mechanism row shaft, 6 ... Unit seal member, 7, 10 ... Screw, 8 ... One-way clutch, 9 ... Frame, 11 ... Door brake device, 21 ... Door, 22 ... Rail, 23 ... rack gear, 41 ... first cap bush, 42 ... cap side seal member, 43 ... shaft, 44 ... first adjust rotor (one first torque generating member), 44b, 52a ... spur gear, 45, 56 ... stop 46 ... Second adjusting rotor (the other first torque generating member), 46c ... First driven cam portion, 47 ... Adjuster, 47b ... First driving cam portion, 48 ... Case side seal member, 51 ... Second cap bush 52 ... first speed-dependent rotor, 52b ... shaft, 52c ... second driving cam portion, 53 ... second speed-dependent rotor (one second torque generating member), 53a ... second driven cam portion, 54 ... elastic member 55 ... Holder, 57 ... Case bush

Claims (7)

A housing filled with a viscous fluid therein, a shaft partially accommodated in the housing and rotatably supported with respect to the housing, and a torque generating surface that can be opposed to each other, are coaxial in the housing A rotary damper that provides resistance to rotation of the shaft by torque generated by viscous resistance of a viscous fluid existing between the torque generation surfaces.
The first torque generating member is composed of one first torque generating member and the other first torque generating member, the one first torque generating member is rotatably held by the housing, and the other first torque generating member is axially moved. It is formed on the first pair of torque generating members held by the housing so as to be movable and not interlocked with the one first torque generating member, and the other first torque generating member. A first driving cam portion that engages with the first driven cam portion is formed, and when the first driving cam portion rotates, the other first torque generating member moves in the axial direction via the first driven cam portion. The first torque is made up of an adjuster that changes the opposed area of the torque generating surface of the first pair of torque generating members, the size of which is adjusted by the adjuster. And adjusting the torque generating mechanism columns for generating,
The second torque generating member is composed of one second torque generating member and the other second torque generating member, and the one second torque generating member is held in the housing so as to be movable and rotatable in the axial direction. The second pair of torque generating members fixed so that the torque generating member does not rotate in conjunction with the one second torque generating member, and the second driven cam portion formed on the one second torque generating member. A rotor for transmitting rotation to the one second torque generating member via the second driven cam portion by rotating the second driving cam portion, and The elastic member biases the one second torque generating member toward the rotor away from the other second torque generating member, and transmits the rotational driving force of the rotor to the one second torque generating member. And moving the one second torque generating member toward the other second torque generating member against the elastic force of the elastic member, whereby the torque generating surface of the second pair of torque generating members A speed-dependent torque generating mechanism array arranged in the housing in parallel with the adjustment torque generating mechanism array, which generates a second torque corresponding to the rotational speed of the rotor by changing the facing area of the rotor;
A rotation transmitting member that transmits one rotational driving force to the other between the one first torque generating member and the rotor;
The rotation damper is characterized in that the shaft is provided coaxially with one of the one first torque generating member or one of the rotors and rotates in conjunction therewith.   The one first torque generating member and the other first torque generating member, and the one second torque generating member and the other second torque generating member constitute the pair of torque generating members. , The radial positions are shifted so as to oppose each other due to relative movement in the axial direction, and one row or a plurality of concentric projections are formed, and projecting plates that form the torque generating surfaces are formed respectively. The rotary damper according to claim 1, wherein:   The rotary damper according to claim 1 or 2, wherein the other second torque generating member is formed by shaping an inner wall of the housing facing the one second torque generating member. .   The rotation damper according to any one of claims 1 to 3, wherein the rotation transmission member is housed in the housing, and the rotation driving force is transmitted in the housing.   The rotation transmission member includes a first transmission portion formed integrally with the one first torque generating member, and a second transmission portion formed integrally with the rotor. The rotary damper according to claim 4.   The rotary damper according to claim 5, wherein the first transmission unit and the second transmission unit are configured by gears meshing with each other, and a gear ratio is set to a predetermined value.   The rotary damper according to any one of claims 1 to 6, wherein the adjustment torque generating mechanism row and the speed-dependent torque generating mechanism row are arranged side by side in a door opening / closing direction and the housing is fixed. And a one-way clutch that is detachably and reversibly attached to the shaft exposed from the housing, and when the door is braked in the reverse direction, the housing has the adjustment torque generating mechanism row and the speed. A door braking device in which the arrangement with the dependent torque generating mechanism row is reversed and fixed in the door opening and closing direction, and the one-way clutch is attached to the shaft with its front and back reversed.

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