JP2015004387A - Rotary damper and opening/closing mechanism of vehicle door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary damper which improves the durability and achieves small fluctuations of generation torque, and to provide an opening/closing mechanism of a vehicle door.SOLUTION: A rotary damper 100 is a load corresponding type rotary damper and includes a housing 101 formed into a cup shape. In the housing 101, a rotor 108, which rotationally displaces in an inner chamber 109, is supported by a support protrusion 106 and a plug 113 so as to rotationally slide. The plug 113 is formed into a plate ring shape, and a first bearing part 114 where one end part of the rotor 108 fits in so as to rotationally slide is formed on an inner peripheral surface of the plug 113. The support protrusion 106 is formed into a columnar shape, and a second bearing part 107 where the other end part of the rotor 108 fits in so as to rotationally slide is formed on an outer peripheral surface of the support protrusion 106. The second bearing part 107 is formed so that its length measured in an axial direction of the rotor 108 becomes longer than a length of the first bearing part 114.

Description

  The present invention relates to a rotary damper and an opening / closing mechanism for a vehicle door.

  2. Description of the Related Art Conventionally, a rotary damper is used for a door such as a tailgate that is freely openable and closable with respect to a vehicle body such as an automobile in order to smoothly open and close the door. A rotary damper is a mechanical device that applies a rotational resistance to a rotating mechanism to attenuate the rotating movement, and the rotor connected to the rotating mechanism has a mechanical frictional force and a flow resistance of a fluid such as oil. It is configured to rotate while resisting. For example, Patent Document 1 below discloses a rotary damper that is connected to a rotating shaft that rotates relative to the tailgate while being attached to the bottom surface of the tailgate that opens and closes relative to the vehicle.

JP 2007-63884 A

  However, in the rotary damper disclosed in Patent Document 1, since the rotary damper and the rotary shaft are respectively fixed to the vehicle side or the tailgate side where they are relatively rotationally displaced, the rotary damper and the rotary shaft when the tailgate is opened and closed. There has been a problem that the durability of the rotary damper is lowered or the generated torque varies due to the relative position or posture deviation between the rotary damper and the rotor.

  The present invention has been made to cope with the above-described problems, and an object of the present invention is to provide a rotary damper and a vehicle door opening / closing mechanism that improve durability and reduce fluctuations in generated torque.

  In order to achieve the above object, the present invention is characterized in that a housing having a cylindrical body or a bottomed cylindrical body, and a shaft-shaped or cylindrical connecting portion, and capable of rotating relative to the housing within the housing. And a fluid damper sealed between the rotor in the housing and one end of the rotor on one end side which is the tip end side of the connecting portion in the housing. A first bearing portion that rotatably supports the outer peripheral portion, and a second bearing portion that rotatably supports the other outer peripheral portion of the rotor on the other end side in the housing. The length of the rotor in the axial direction is longer than that of one bearing portion.

  According to the feature of the present invention configured as described above, the rotary damper includes a first bearing portion that supports the outer peripheral surface of one end portion on the rotor connecting portion side, and an outer peripheral surface of the other end portion of the rotor. The second bearing portion is supported, and the second bearing portion is formed to have a longer length in the axial direction of the rotor than the first bearing portion. That is, the rotary damper supports the rear end portion side of the rotor on which a large external force acts on the rotor to cause a displacement of the position and posture of the rotor among the first bearing portion and the second bearing portion that rotatably support the rotor. The two bearing portions are formed with a larger surface area than the first bearing portion. As a result, the rotary damper prevents deformation and breakage of the support portion of the rotor even when an external force that causes a shift in the relative position and posture with the rotating shaft connected to the rotor is applied. Stable rotation of the rotor can be maintained, durability can be improved, and fluctuations in generated torque can be suppressed. In addition, the rotary damper can suppress the improvement in durability and torque fluctuation without reducing the volume of the accommodating portion that accommodates the fluid as compared with the case where the length on the first bearing portion side is increased.

  According to another aspect of the present invention, in the rotary damper, the second bearing portion is formed to have a length that is not less than 1.5 times and not more than 10 times the length of the first bearing portion in the axial direction of the rotor. There is to be.

  According to another feature of the present invention configured as described above, the rotary damper is formed by forming the second bearing portion to be 1.5 times or more and 10 times or less the length of the first bearing portion. As compared with a conventional rotary damper in which the lengths of the first bearing portion and the second bearing portion are substantially the same, it is possible to effectively improve the durability and suppress the torque fluctuation. In this case, the length of the second bearing portion is preferably not less than 1.5 times and not more than 5 times the length of the first bearing portion, more preferably 1.5 times the length of the first bearing portion. A length of 3 times or more is preferable.

  Another feature of the present invention is that in the rotary damper, the housing is formed in a bottomed cylindrical shape, and the rotor has an end surface on the second bearing portion side that is in close contact with the bottom surface of the housing. .

  According to another feature of the present invention configured as described above, the rotary damper is configured such that the housing is formed in a bottomed cylindrical shape, and the end surface of the rotor on the second bearing portion side is in close contact with the bottom. The rotor can be supported more reliably even when an external force that causes a displacement in position or posture is applied between the rotor and the rotor, and the rotor and the rotor periphery can be prevented from being deformed or damaged, thereby stabilizing the rotor. Rotation can be maintained.

  Another feature of the present invention is that in the rotary damper, the housing is formed in a bottomed cylindrical shape, and the rotor has a gap between the end surface on the second bearing portion side and the bottom surface of the housing. It is to be arranged.

  According to another feature of the present invention configured as described above, the rotary damper is configured such that the housing is formed in a bottomed cylindrical shape, and the end surface on the second bearing portion side is disposed between the bottom portion with a gap. Therefore, as compared with the case of close contact, the rotor is rotated by a smaller external force (external force acting between the housing and the rotor) including the case where an external force that causes a shift in position and posture is applied to the rotor. In addition, the molding accuracy of the housing and the rotor can be lowered, and the manufacture becomes easy.

  Further, the present invention can be implemented not only as an invention of a rotary damper but also as an invention of an opening / closing mechanism for a vehicle door provided with the rotary damper.

  Specifically, the opening / closing mechanism for the vehicle door has a rotation shaft that rotates with respect to the other of the vehicle body and the door and supports the door so that the door can be opened and closed with respect to the vehicle body. In a vehicle door opening / closing mechanism having a rotary damper that is connected to a shaft and applies rotational resistance to the rotation of the door, the rotary damper is connected to a rotary shaft and a housing formed of a cylindrical body or a bottomed cylindrical body. A rotor having a shaft-shaped or cylindrical connection portion that is supported so as to be relatively rotatable with respect to the housing in the housing, a fluid sealed between the rotor in the housing, and a housing The first bearing portion that rotatably supports one outer peripheral portion of the rotor on one end side that is the tip end side of the connecting portion, and the other outer peripheral portion of the rotor rotates on the other end portion side in the housing freely And a second bearing portion for supporting the second bearing portion, may axial length of the rotor is longer than the first bearing.

  In this case, in the opening / closing mechanism for the vehicle door, the second bearing portion may be formed to have a length that is not less than 1.5 times and not more than 10 times the length of the first bearing portion in the axial direction of the rotor. .

(A), (B) has shown the outline of the whole structure of the rotary damper which concerns on this invention, (A) is the top view which abbreviate | omitted the plug in the rotary damper, (B) is A shown to (A). It is sectional drawing seen from -A. (A), (B) has shown the outline of the whole structure of the opening / closing mechanism of the vehicle door provided with the rotary damper shown in FIG. 1, (A) is the side view which showed the state which the tailgate closed. (B) is a side view showing a state in which the tailgate is opened. It is sectional drawing of the opening-and-closing mechanism of the door for vehicles seen from the BB line shown in FIG. The outline of the whole structure of the opening-and-closing mechanism of the door for vehicles concerning the modification of the present invention is shown, (A) is the side view showing the state where the tailgate was closed, and (B) was the tailgate opened. It is the side view which showed the state. It is sectional drawing of the opening / closing mechanism of the door for vehicles seen from CC line shown in FIG. It is sectional drawing of the rotary damper which concerns on the other modification of this invention. (A), (B) is the top view which abbreviate | omitted the plug in the rotary damper which concerns on the other modification of this invention, (A) is a top view which showed the stationary state of the rotary damper, (B) It is the top view which showed one process in the action | operation of a rotary damper. (A), (B) has shown the outline of the whole structure of the rotary damper which concerns on the other modification of this invention, (A) is the top view which abbreviate | omitted the plug in the rotary damper, (B) is ( It is sectional drawing seen from AA shown to A).

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a rotary damper and a vehicle door opening / closing mechanism according to the present invention will be described with reference to the drawings. 1A and 1B schematically show the overall configuration of a rotary damper 100 according to the present invention. FIG. 1A is a plan view of the rotary damper 100, and FIG. It is sectional drawing of the rotary damper 100 seen from the arrow direction shown. In FIG. 1A, the plug is omitted so that the internal state of the rotary damper 100 can be understood. In addition, each figure referred in this specification has the part typically expressed, such as exaggerating and showing a one part component, in order to make an understanding of this invention easy. For this reason, the dimension, ratio, etc. between each component may differ. The rotary damper 100 is attached to a door such as a tailgate that is opened and closed with respect to two parts that are movably connected to each other, for example, the interior of a vehicle such as an automobile, and opens and closes the tailgate during the opening and closing operation. A smoothing machine.

(Configuration of rotary damper 100)
The rotary damper 100 includes a housing 101. The housing 101 is a bottomed cylindrical part that constitutes the casing of the rotary damper 100, and is formed by injection molding a zinc material. A movable piece 102 is formed on the outer peripheral portion of the housing 101 so as to protrude outward in the radial direction. The movable piece 102 is a part for connecting the rotary damper 100 to one of two parts (not shown) to which the rotary damper 100 is to be attached, and extends radially outward from the outer periphery of the housing 101. It is formed in a substantially triangular shape when viewed from above, with the width becoming narrower. An attachment through hole 103 used when attaching to the one part (not shown) to which the rotary damper 100 is attached passes through the tip of the movable piece 102 in parallel to the axial direction of the housing 101. It is formed in a state.

  On the other hand, the inside of the housing 101 is formed in a cylindrical surface, and housing vanes 104 are formed in a state of projecting from each other at two positions facing each other on the cylindrical inner peripheral surface. The housing vane 104 is a wall-shaped part that partitions the interior of the housing 101 together with the rotor 108 described later, and extends toward the inside of the housing 101 in a state of extending along the axial direction of the housing 101 on the inner peripheral surface of the housing 101. Are formed in a protruding shape. In this case, the front end surface of the housing vane 104 is formed in an arc shape along the inner peripheral surface of the housing 101. An orifice 105 is formed in the housing vane 104 so as to penetrate in the circumferential direction of the inner peripheral surface of the housing 101.

  The orifice 105 is a groove-shaped cut for flowing in both directions while restricting the flow rate of the fluid 115 between the first region E1 and the second region E2 formed on both sides of the housing vane 104. It is a lack. The cross-sectional area of the orifice 105, in other words, the flow amount of the fluid 115 in the orifice 105 is appropriately set according to the magnitude of the load (torque) during rotation required for the rotor 108 of the rotary damper 100.

  A support protrusion 106 is formed on the bottom inside the housing 101. The support protrusion 106 is a portion for rotatably supporting the rotor 108, and is formed in a columnar shape that protrudes from the center of the bottom in the housing 101. In this case, the outer peripheral surface of the support protrusion 106 constitutes a second bearing portion 107 that is rotatably slidably fitted into a fitting recess 111 formed in the rotor 108. It is formed with an outer diameter that fits freely. Further, the amount of protrusion from the bottom of the support protrusion 106, that is, the length of the second bearing portion 107 in the axial direction of the housing 101 is formed longer than the length of the first bearing portion described later. In the present embodiment, the length of the second bearing portion 107 is formed to be twice the length of the first bearing portion 114 described later.

  The rotor 108 is a bottomed cylindrical body that rotates inside the housing 101, and is formed by injection molding a zinc material. The outer peripheral portion of the rotor 108 is formed in a cylindrical surface that is in sliding contact with the respective front end surfaces of the two housing vanes 104. As a result, the inner space formed by the first region E1 and the second region E2 is partitioned into the ring-shaped space between the inner peripheral surface of the housing 101 and the outer peripheral surface of the rotor 108 by the housing vane 104. 109 is formed. Further, on the outer peripheral portion of the rotor 108, rotor vanes 110 are formed in a state of projecting radially outward at positions facing each other on the outer peripheral portion formed in a cylindrical surface.

  The rotor vane 110 is a wall-shaped portion that rotates and displaces in the first region E1 and the second region E2 as the rotor 108 rotates, and protrudes in a convex shape while extending along the axial direction of the rotor 108. Each is formed. In this case, each rotor vane 110 is formed in a cylindrical surface shape corresponding to the inner peripheral surface of the housing 101 with a protruding amount slidable on the inner peripheral surface of the housing 101 and the shape of the front end surface.

  Further, a fitting recess 111 is formed on the outer peripheral portion on the bottom side of the rotor 108 so as to extend in a cylindrical shape. The fitting recess 111 is a portion in which the support protrusion 106 in the housing 101 is fitted to be freely slidable, and is formed in a concave shape corresponding to the support protrusion 106. That is, the fitting recess 111 is formed to have an inner diameter in which the support protrusion 106 is fitted to be freely slidable. Further, the depth of the fitting recess 111 is formed to a depth corresponding to the protruding amount of the support protrusion 106. As a result, the rotor 108 is supported so as to be freely slidable while the lower end surface of the fitting recess 111 is in close contact with the upper end surface of the support protrusion 106.

  On the other hand, a connecting portion 112 is formed inside the rotor 108. The connection part 112 is a part for connecting to the other part with respect to the one of the two parts (not shown) to which the rotary damper 100 is attached, and has a bottomed cross-sectional shape formed in a hexagonal shape. It is formed in a cylindrical shape. In this embodiment, it forms in the hole shape which the rotating shaft 209 mentioned later fits.

  The rotor 108 is supported at its upper end by a plug 113 in a state in which the lower fitting recess 111 is fitted to the support protrusion 106 of the housing 101 so as to be freely slidable. The plug 113 is a component that supports the front end portion of the connecting portion 111 in the rotor 108 so as to be freely slidable while sealing the inner chamber 109 and the orifice 105 in the housing 101 in a liquid-tight and air-tight manner. It is formed in a shape. The inner peripheral surface of the plug 113 constitutes a first bearing portion 114 in which the upper end portion of the rotor 108 shown in the figure is fitted to be freely slidable. On the other hand, the outer periphery of the flag 113 is fixed to the opening of the housing 101 by caulking of the opening.

  A fluid 115 is sealed in the inner chamber 109. The fluid 115 is a substance for applying a damper function to the rotary damper 100 by applying resistance to the rotor vane 110 that is rotationally displaced in the first region E1 and the second region E2 in the inner chamber 109. It is composed of a liquid, gel-like or semi-solid substance having fluidity having viscosity according to the specifications of the rotary damper 100. In the present embodiment, the fluid 115 is made of oil, for example, silicone oil.

  The thus configured rotary damper 100 is provided between two parts that are movably connected to each other. For example, the rotary damper 100 includes a part of an opening / closing mechanism 202 that movably supports a tailgate 201 with respect to a cargo bed 200 in a vehicle such as an automobile, as shown in FIGS. Used as The opening / closing mechanism 202 can turn the plate-like tailgate 201 to a standing state (see FIG. 2A) or a horizontal state (see FIG. 2B) with respect to the loading platform 200 formed to extend horizontally. It is an instrument to support, and is mainly composed of a rotary damper 100 and a hinge 203.

  The hinge 203 is a group of components that movably connects the tailgate 201 to the loading platform 200, and mainly includes a loading platform side arm 204, a gate side arm 206, and a rotating shaft 209. The loading platform side arm 204 is a component for supporting the tailgate 201 in a state of projecting toward the rear of the vehicle, and is configured by forming a steel material in an L shape. The cargo bed side arm 204 has one of two pieces projecting from the rear end of the cargo bed 200 toward the rear of the vehicle to form a protruding piece 204a, and the other piece is the rear edge of the cargo bed 200. The part is attached by bolts 205. A boss portion 204b projecting in a cylindrical shape in a direction orthogonal to the projecting piece 204a is formed at the tip portion of the projecting portion 204a. The boss portion 204b supports the gate side arm 206 and the rotating shaft 209, respectively.

  The gate side arm 206 is a part for supporting the tail gate 201 with respect to the cargo bed side arm 204, and is formed by forming a steel material in an L shape. The gate-side arm 206 has one of two pieces protruding from the lower end of the tailgate 201 toward the lower side of the vehicle to form a protruding piece 206a, and the other piece is the lower end of the tailgate 201. It is attached to the part with a bolt 207. The projecting piece 206a has a mounting screw hole 206b formed on the tail gate 201 side and a fitting hole 206c formed on the tip end side.

  The mounting screw hole 206b is a female screw for fixedly mounting the rotary damper 100 to the gate side arm 206, and a bolt 208 passing through the mounting through hole 103 of the rotary damper 100 is screw-fitted. The fitting hole 206c is a hole that penetrates the overhanging piece 206a. The boss 204b of the loading platform side arm 204 is slidably fitted on one side of the hole, and on the other side of the hole. It is formed in the internal diameter which each front-end | tip part of the rotor 108 of the rotary damper 100 and the plug 113 enters.

  The rotary shaft 209 is a component for connecting the boss portion 204b of the loading platform arm 204 and the rotary damper 100, and is configured by forming a steel material into a pin shape. One end (right side in the figure) of the rotary shaft 209 is formed in a flange shape and is fixed to the projecting piece 204a of the loading platform side arm 204 by a bolt (not shown), and the other end (left side in the figure) is hexagonal. It is formed in a shape and is fitted to the connecting portion 112 of the rotor 108 in the rotary damper 100. That is, the rotating shaft 209 rotates relative to the tailgate 201 while being fixed to the loading platform 200 side. The rotary damper 100 adds rotational resistance to the opening / closing mechanism 202 when the tailgate 201 is rotationally displaced with respect to the loading platform 200. A stopper 210 that restricts the tilting of the tailgate 201 toward the loading platform 200 is provided at the rear end of the loading platform 200.

(Operation of rotary damper 100)
The operation of the thus configured rotary damper 100 will be described. The rotary damper 100 is configured such that the housing 101 rotates relative to the rotor 104 by opening and closing the tailgate 201 in a state where the two rotor vanes 110 of the rotor 108 are positioned on the housing vane 104 side opposite to each other. To do. That is, when the tailgate 201 is opened from the closed state, or when the tailgate 201 is closed from the opened state, the rotary damper 100 rotates the gate side arm 206 relative to the cargo bed side arm 204 to cause the housing 101 to move. It rotates relative to the rotor 108.

  In this case, in the rotary damper 100, the housing vanes 104 in the first region E1 and the second region E2 in the inner chamber 109 are rotationally displaced in the same rotational direction as the rotational direction of the housing 101, respectively. For this reason, in the housing 101 and the rotor 108 of the rotary damper 100, the fluid 115 in each of the first region E1 and the second region E2 passes through the orifice 105 to the second region E2 and the first region. A reaction force is applied to flow in each other region of E1. As a result, the rotary damper 100 can slowly rotate and displace the tailgate 204 in order to give a rotation resistance to the rotation displacement of the gate side arm 206 relative to the loading platform side arm 204.

  In addition, when the rotary damper 100 is rotationally displaced and stationary, an external force is applied between the housing 101 and the rotor 108 in the rotary damper 100 in the direction intersecting the axial direction of the rotor 108 by the external force applied to the loading platform 200 and the tailgate 201. In other words, an external force that changes the position or posture of the rotor 108 may act on the housing 101. However, in this case, the rotor 108 has one end on the connection portion 112 side supported by the first bearing portion 114 so as to be rotatable and slidable, and the other end of the rotor 108 is supported by the second bearing portion 107. It is supported so that it can rotate and slide. The rotary damper 100 is a rear end of the rotor 108, among the first bearing portion 114 and the second bearing portion 107 that rotatably supports the rotor 108, and an external force that causes a displacement of the position and posture of the rotor 108. The second bearing portion 107 that supports the portion side (in other words, the tip end portion side of the rotating shaft 209) is in contact with the rotor 108 with a larger surface area than the first bearing portion 114. As a result, the rotary damper 100 can stably support the rotor 108, and can prevent the position of the rotor 108 from shifting in position and posture and the deformation and breakage of the housing 101, the rotor 108, and the plug 113, thereby stabilizing the rotor 108. Rotation can be secured.

  As can be understood from the description of the operation method, according to the embodiment, the rotary damper 100 includes the first bearing portion 114 that supports the outer peripheral surface of one end portion on the connection portion side of the rotor 108, the rotor 108 and a second bearing portion 107 that supports the outer peripheral surface of the other end portion. The second bearing portion 107 is formed such that the axial length of the rotor 108 is longer than the first bearing portion 114. ing. In other words, the rotary damper 100 has a rear end of the rotor 108, among the first bearing portion 114 and the second bearing portion 107 that rotatably support the rotor 108, to which an external force that causes a displacement of the position and posture of the rotor 108 acts greatly. The second bearing portion 107 that supports the portion side is formed with a larger surface area than the first bearing portion 114. As a result, the rotary damper 100 is deformed or damaged in the support portion of the rotor 108 even when an external force is applied to the rotary shaft 209 connected to the rotor 108 to cause a shift in relative position and posture. Can be prevented and stable rotation of the rotor 108 can be maintained, durability can be improved and fluctuations in generated torque can be suppressed. Further, the rotary damper 100 suppresses the improvement in durability and torque fluctuation without reducing the volume of the inner chamber 109 that accommodates the fluid 115, compared to the case where the length on the first bearing portion 114 side is increased. be able to.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention. In addition, in each modification shown below, the code | symbol corresponding to the same component as said each embodiment is attached | subjected, and the description is abbreviate | omitted.

  For example, in the above embodiment, the rotary damper 100 has the housing 101 attached to the tailgate 201 via the gate side arm 206 and the rotor 108 coupled to the bed 200 via the rotary shaft 209 and the bed side arm 204. However, the rotary damper 100 only needs to be attached between the loading platform 200 and the tailgate 201 via the rotation shaft 209, and is not necessarily limited to the above embodiment. Therefore, for example, as shown in FIGS. 4 (A), (B) and FIG. 5, the rotary damper 100 attaches the housing 101 to the loading platform 200 via the loading platform side arm 204 and attaches the rotor 108 to the rotating shaft 209 and the gate. It can also be connected to the tailgate 201 via the side arm 206.

  In this case, the overhanging piece 204a in the loading platform side arm 204 is provided with a mounting screw hole (not shown) corresponding to the mounting screw hole 206b and the fitting hole 206c in the above embodiment, instead of the boss portion 204b in the above embodiment, and The fitting holes 204c are respectively formed. In addition, a boss portion 206d corresponding to the boss portion 204b in the above embodiment is formed in the projecting piece 206a in the gate side arm 206 instead of the mounting screw hole 206b and the fitting hole 206c in the above embodiment. The rotary damper 100 forms a portion corresponding to the loading platform side arm 204 in the loading platform 200 and forms a portion corresponding to the gate side arm 206 in the tail gate 201 so that the loading platform 200 and the tail gate 201 are directly connected. It can also be attached.

Further, in the above-described embodiment, the rotary damper 100 includes the first bearing 114 and the second bearing 107 that support the rotor 108 so as to be able to rotate and slide. The length of the second bearing 107 in the axial direction is the first bearing. The length was set to twice the length of the portion 114 in the axial direction. However, the length of the second bearing portion 107 in the axial direction may be longer than the length of the first bearing portion 114 in the axial direction. In this case, according to the experiments by the present inventors, the length of the second bearing portion 107 in the axial direction is preferably 1.5 times or more and not more than 3 times the length of the first bearing portion 114 in the axial direction. is there.
In particular, in the rotary damper 100 used in a vehicle such as an automobile and used in the door opening and closing mechanism 202 such as the tailgate 201, the length of the second bearing portion 107 in the axial direction is preferably 5 mm or more and 10 mm or less. . The length of the second bearing portion 107 is preferably 1.5 times or more and not more than 5 times the length of the first bearing portion 114, more preferably 1. A length of 5 times or more and 3 times or less is preferable.

  Further, in the above embodiment, the rotor 108 in the rotary damper 100 is supported so as to be freely slidable while the illustrated lower end surface of the fitting recess 111 of the rotor 108 is in close contact with the illustrated upper end surface of the support protrusion 106 of the housing 101. The As a result, the rotary damper 100 can more strongly support the rotor 108 and prevent deformation and breakage around the rotor 108 even when an external force that causes the position and posture of the rotor 108 to shift is applied. it can. However, the rotor 108 in the rotary damper 100 is disposed via a gap S between the illustrated upper end surface of the support protrusion 106 of the housing 101 and the illustrated lower end surface of the fitting recess 111 of the rotor 108 as shown in FIG. You can also According to this, since the rotary damper 100 can reduce the rotational resistance of the rotor 108 as compared with the above-described embodiment, the rotary damper 100 is smaller including the case where an external force that causes a displacement of the position and posture acts on the rotor 108. It can be rotated by an external force (external force acting between the housing 101 and the rotor 108), and the molding accuracy of the housing 101 and the rotor 108 can be lowered as compared with the above embodiment, so that the manufacture becomes easy. .

  In the above embodiment, the rotary damper 100 is configured as a load-compatible rotary damper having a constant rotational resistance regardless of an external force acting between the housing 101 and the rotor 108. However, the rotary damper 100 may be a pressure-type rotary damper whose rotational resistance changes according to an external force acting between the housing 101 and the rotor 108. Accordingly, the rotary damper 100 can open and close the tailgate 204 at a constant speed regardless of the magnitude of the external force acting on the tailgate 201.

  The load-compatible rotary damper 100 is configured, for example, as shown in FIGS. 7A and 7B by providing a valve 105b that closes the opening 105a so that the opening 105a of the orifice 105 can be opened and closed. be able to. The valve 105b opens the opening 105a at the maximum opening degree when the rotary damper 100 is in an unloaded state (see FIG. 7A), and the opening of the orifice 105 is caused by the displacement of the rotor vane 110 toward the valve 105b. The portion 105a is closed according to the displacement speed of the rotor vane 110 (see FIG. 7B), and the flow rate of the orifice 105 is changed. Thereby, the rotary damper 100 can change the rotational resistance in accordance with the magnitude of the external force applied between the housing 101 and the rotor 108.

  Moreover, in the said embodiment, the rotary damper 100 comprised the housing 101 in the shape of a bottomed cylinder. However, in the rotary damper 100, for example, as shown in FIGS. 8A and 8B, the support protrusion 106 in the housing 101 and the fitting recess 111 in the rotor 108 are omitted, and the housing 101 is formed in a cylindrical shape. It can also be configured.

Moreover, in the said embodiment, the rotary damper 100 formed the connection part 112 of the rotor 108 in the bottomed cylinder shape with which the rotating shaft 209 fits. However, the shape of the connecting portion 112 in the rotor 108 only needs to be formed so as to be connectable to the rotating shaft 209. Therefore, the connection part 112 in the rotor 108 can also be formed in a cylindrical shape on the through hole. Also,
The connecting portion 112 in the rotor 108 can also be formed in a shaft shape that fits into a through hole or a bottomed hole formed in the rotating shaft 209.

  Further, in the above embodiment, the rotor 108 in the rotary damper 100 can be rotated and slid by the shaft-shaped second bearing portion 107 formed on the housing 101 and the cylindrical first bearing portion 114 formed on the plug 113. It is supported in the state. However, the rotor 1108 is not necessarily limited to the above-described embodiment as long as both end portions thereof are supported by the first bearing portion 114 and the second bearing portion 107 so as to be freely slidable. Therefore, the first bearing portion 114 can be formed of a member other than the housing 101 like the second bearing portion 107, and the second bearing portion 107 is directly formed on the housing 101 like the first bearing portion 114. You can also

  Moreover, in the said embodiment, the rotary damper 100 was integrated in the opening-and-closing mechanism 202 of the tailgate 201 of a vehicle. However, the rotary damper 100 can be used for an opening / closing mechanism of a door other than the tailgate 201, for example, a door where personnel enter and exit, and can be used for an opening / closing mechanism of a door other than a vehicle such as an automobile. The rotary damper 100 can also be used for a rotational displacement mechanism that connects two objects so as to be relatively rotatable, for example, a seat reclining mechanism. These opening / closing mechanisms and rotational displacement mechanisms require shaft components corresponding to the rotational shaft 209 that rotates and displaces together with one of the two objects.

E1 ... first region, E2 ... second region, S ... gap,
DESCRIPTION OF SYMBOLS 100 ... Rotary damper 101 ... Housing 102 ... Movable piece 103 ... Mounting through-hole, 104 ... Housing vane, 105 ... Orifice, 105a ... Opening part, 105b ... Valve, 106 ... Support protrusion, 107 ... 2nd bearing part, DESCRIPTION OF SYMBOLS 108 ... Rotor, 109 ... Inner chamber, 110 ... Rotor vane, 111 ... Fitting recessed part, 112 ... Connection part, 113 ... Plug, 114 ... 1st bearing part, 115 ... Fluid,
DESCRIPTION OF SYMBOLS 200 ... Loading platform, 201 ... Tail gate, 202 ... Opening / closing mechanism, 203 ... Hinge, 204 ... Loading platform side arm, 204a ... Overhang piece, 204b ... Boss part, 204c ... Fitting hole, 205 ... Bolt, 206 ... Gate side arm , 206a ... projecting piece, 206b ... mounting screw hole, 206c ... fitting hole, 206d ... boss, 207 ... bolt, 208 ... bolt, 209 ... rotating shaft, 210 ... stopper.

Claims (6)

A housing composed of a cylindrical body or a bottomed cylindrical body;
A rotor having a shaft-like or cylindrical connection portion and supported so as to be rotatable relative to the housing in the housing;
In a rotary damper comprising a fluid sealed between the rotor in the housing,
A first bearing portion rotatably supporting one outer peripheral portion of the rotor on one end side which is the tip end side of the connection portion in the housing;
A second bearing portion that rotatably supports the other outer peripheral portion of the rotor on the other end side in the housing;
The second bearing portion is
The rotary damper is characterized in that the length of the rotor in the axial direction is longer than that of the first bearing portion. The rotary damper according to claim 1,
The second bearing portion is
A rotary damper having a length that is 1.5 times or more and 10 times or less the length of the first bearing portion in the axial direction of the rotor. In the rotary damper according to claim 1 or 2,
The housing is formed in a bottomed cylindrical shape,
The rotary damper is characterized in that the end surface on the second bearing portion side is in close contact with the bottom surface of the housing. In the rotary damper according to claim 1 or 2,
The housing is formed in a bottomed cylindrical shape,
The rotary damper is characterized in that the end surface on the second bearing portion side is disposed with a gap between the rotor and the bottom surface of the housing. A hinge that has a rotating shaft that rotates with respect to the other of the vehicle body and the door, and that supports the door so that it can be opened and closed with respect to the vehicle body;
In a vehicle door opening / closing mechanism comprising a rotary damper connected to the rotating shaft and acting on a rotation resistance of the door rotation,
The rotary damper is
A housing composed of a cylindrical body or a bottomed cylindrical body;
A rotor having a shaft-like or cylindrical connection portion connected to the rotating shaft and supported so as to be rotatable relative to the housing in the housing;
A fluid encapsulated between the rotor and the rotor in the housing;
A first bearing portion rotatably supporting one outer peripheral portion of the rotor on one end side which is the tip end side of the connection portion in the housing;
A second bearing portion that rotatably supports the other outer peripheral portion of the rotor on the other end side in the housing;
The second bearing portion is
An opening / closing mechanism for a vehicle door, wherein the length of the rotor in the axial direction is longer than that of the first bearing portion. In the vehicle door opening and closing mechanism according to claim 5,
The second bearing portion is
An opening / closing mechanism for a vehicle door, wherein the opening / closing mechanism of the vehicle is formed to have a length that is 1.5 times or more and 10 times or less of a length of the first bearing portion in the axial direction of the rotor.

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