JP5814086B2

JP5814086B2 - back door

Info

Publication number: JP5814086B2
Application number: JP2011248996A
Authority: JP
Inventors: 山本　健次; 健次山本
Original assignee: Shiroki Corp
Current assignee: Shiroki Corp
Priority date: 2011-11-14
Filing date: 2011-11-14
Publication date: 2015-11-17
Anticipated expiration: 2031-11-14
Also published as: JP2013103617A

Description

本発明は、車両本体に対して上下方向に回転可能に設けられたバックドアに関する。 The present invention relates to a back door provided to be rotatable in the vertical direction with respect to a vehicle body.

車両本体に対して上下方向に回転可能なバックドアやトラックリッドにおいては、ステーに設けられたスプリング等の付勢部材の付勢力により、バックドアやトランクリッドを開方向に付勢するものがある。 Some back doors and track lids that can rotate in the vertical direction with respect to the vehicle body urge the back doors and the trunk lid in the opening direction by the urging force of an urging member such as a spring provided on the stay. .

更に、全開時でのバックドアやトランクリッドと車両本体にとの衝撃を緩和するために、閉方向より開方向の抵抗が強いダンパを設けたバックドアやトランクリッドもある（例えば、特許文献１参照）。 Further, there is a back door or trunk lid provided with a damper having a resistance higher in the opening direction than in the closing direction in order to alleviate the impact between the back door or trunk lid and the vehicle body when fully opened (for example, Patent Document 1). reference).

特開２００８−３０２９２２号公報JP 2008-302922 A

特許文献１に記載された構成のバックドアやトランクリッドのダンパは、閉方向より開方向の抵抗が強いので、付勢部材の付勢力を大きくしなければ、開状態を保持できない。よって、付勢部材が大型化し、ステーも大型化する問題点がある。 The damper of the back door or trunk lid having the configuration described in Patent Document 1 has a resistance in the opening direction that is stronger than the closing direction, and therefore cannot be kept open unless the urging force of the urging member is increased. Therefore, there is a problem that the biasing member is enlarged and the stay is also enlarged.

本発明は、上記問題点に鑑みてなされたもので、その課題は、ステーを小型化できるバックドアを提供することにある。 This invention is made | formed in view of the said problem, The subject is providing the back door which can reduce a stay in size.

上記課題を解決する本願発明は、車両本体に上下方向に回転可能に設けられたバックドア本体と、左側、右側にそれぞれ少なくとも一つ設けられ、一端部が前記車両本体に、他端部が前記バックドアに、それぞれ回転可能に取り付けられ、前記バックドア本体を開放方向に付勢するバックドア付勢部材を有するステーと、を有し、少なくとも一つのステーは、前記車両本体、前記バックドア本体のうちのどちらか一方に回転可能に取り付けられたシリンダと、一端部が前記車両本体、前記バックドア本体のうちの他方に回転可能に取り付けられ、他端部側が前記シリンダに係合し、前記シリンダの中心軸に沿って移動可能に設けられた移動部材と、前記移動部材と前記シリンダとの間に抵抗を発生させる抵抗発生手段と、からなり、前記抵抗発生手段は、前記バックドア本体が閉方向に回転する時に発生させる抵抗をA、前記バックドア本体が開方向に回転する時に発生させる抵抗をBとした時、常にA＞Bであることを特徴とするバックドアである。 The present invention that solves the above problems includes a back door body that is rotatably provided in the vehicle body in the vertical direction, at least one on each of the left and right sides, one end on the vehicle body, and the other end on the vehicle body. And a stay having a back door urging member that is rotatably attached to the back door and urges the back door body in the opening direction. At least one stay includes the vehicle body and the back door body. A cylinder rotatably attached to either one of the vehicle body, one end is rotatably attached to the other of the vehicle body and the back door body, and the other end is engaged with the cylinder, A movable member provided so as to be movable along a central axis of the cylinder, and resistance generating means for generating a resistance between the movable member and the cylinder. The raw means is always A> B, where A is the resistance generated when the back door body rotates in the closing direction, and B is the resistance generated when the back door body rotates in the opening direction. It is a back door.

本願発明によれば、前記抵抗発生手段は、前記バックドア本体が閉方向に回転する時に発生させる抵抗をA、前記バックドア本体が開方向に回転する時に発生させる抵抗をBとした時、常にA＞Bであることにより、全開時において、閉方向への抵抗が大きいので、全開状態を保持する付勢部材の付勢力が少なくてすむ。よって、付勢部材を小型にでき、ステーも小型化できる。 According to the present invention, the resistance generating means, when the resistance generated when the back door body rotates in the closing direction is A, and when the resistance generated when the back door body rotates in the opening direction is B, always Since A> B, the resistance in the closing direction is large at the time of full opening, so that the urging force of the urging member that holds the fully opened state can be reduced. Therefore, the biasing member can be reduced in size, and the stay can also be reduced in size.

また、バックドア本体を開方向に回転させるモーメントと閉方向に回転させるモーメントが等しくなるように抵抗発生手段の抵抗A、抵抗Bを設定すれば、バックドア本体を任意の位置で保持することができる。 In addition, if the resistance A and resistance B of the resistance generating means are set so that the moment for rotating the back door body in the opening direction and the moment for rotating in the closing direction are equal, the back door body can be held at an arbitrary position. it can.

図３に示す第１実施形態のバックドアに用いるステーの断面図である。It is sectional drawing of the stay used for the back door of 1st Embodiment shown in FIG. 図１のステーのシリンダの断面図である。It is sectional drawing of the cylinder of the stay of FIG. 一方の側から見た車両後部を説明する図である。It is a figure explaining the vehicle rear part seen from one side. 他方の側から見た車両後部を説明する図である。It is a figure explaining the vehicle rear part seen from the other side. 図４のステーの断面図である。It is sectional drawing of the stay of FIG. 第２実施形態の抵抗発生手段を示す図である。It is a figure which shows the resistance generation means of 2nd Embodiment. 第３実施形態の抵抗発生手段を示す図である。It is a figure which shows the resistance generation means of 3rd Embodiment. 図７に示す第１バルブの弁体の斜視図である。It is a perspective view of the valve body of the 1st valve | bulb shown in FIG.

＜第１実施形態＞
次に図面を用いて本発明を自動車のバックドアに適用した第１実施形態を説明する。 <First Embodiment>
Next, a first embodiment in which the present invention is applied to a back door of an automobile will be described with reference to the drawings.

図１は図３に示す第１実施形態のバックドアに用いるステーの断面図、図２は図１のステーのシリンダ部分の断面図、図３は一方の側（左側）から見た車両後部を説明する図、図４は他方の側（右側）から見た車両後部を説明する図、図４のステーの断面図である。 1 is a sectional view of a stay used for the back door of the first embodiment shown in FIG. 3, FIG. 2 is a sectional view of a cylinder portion of the stay of FIG. 1, and FIG. 3 is a rear view of the vehicle as viewed from one side (left side). FIG. 4 is a diagram for explaining the rear portion of the vehicle as viewed from the other side (right side), and FIG.

最初に、図３、図４を用いて、バックドアの全体構成を説明する。図３に示すように、バックドア本体１１は、車両本体１３に対して上下方向に回転可能に設けられている。そして、ステー２１がバックドア本体１１の一方の側部と、車両本体１３とに取り付けられている。また、図４に示すように、ステー１２１がバックドア本体１１の他方の側部と、車両本体１３とに取り付けられている。 Initially, the whole structure of a back door is demonstrated using FIG. 3, FIG. As shown in FIG. 3, the back door body 11 is provided so as to be rotatable in the vertical direction with respect to the vehicle body 13. A stay 21 is attached to one side of the back door body 11 and the vehicle body 13. Further, as shown in FIG. 4, the stay 121 is attached to the other side portion of the back door main body 11 and the vehicle main body 13.

ここで、図１を用いて、ステー２１を説明する。ステー２１は、一方の端面が開放面となった有底円筒状の第１ケース２３と、一方の端面が開放面となり、内径が第１ケース２３の外径より大きな有底円筒状の第２ケース２５とを有している。 Here, the stay 21 will be described with reference to FIG. The stay 21 includes a bottomed cylindrical first case 23 having one open end surface, and a bottomed cylindrical second case having one open end surface and an inner diameter larger than the outer diameter of the first case 23. And a case 25.

そして、第１ケース２３の開放面と、第２ケース２５の開放面とが対向するように、両者は嵌合し、第２ケース２５は第１ケース２３に対して進退可能となっている。 And both are fitted so that the open surface of the 1st case 23 and the open surface of the 2nd case 25 may oppose, and the 2nd case 25 can advance / retreat with respect to the 1st case 23.

本実施形態では、第１ケース２３は車両本体１３側に取り付けられ、第２ケース２５はバックドア本体１１側に取り付けられている。尚、第１ケース２３をバックドア本体１１側に、第２ケース２５を車両本体１３側に取り付けてもよい。 In the present embodiment, the first case 23 is attached to the vehicle body 13 side, and the second case 25 is attached to the back door body 11 side. The first case 23 may be attached to the back door body 11 side, and the second case 25 may be attached to the vehicle body 13 side.

第１ケース２３、第２ケース２５内には、一端が第１ケース２３の内部底面側に、他端が第２ケース２５の内部底面側に押接するスプリング（バックドア付勢部材）３７により、バックドア本体１１は開放方向に付勢されている（詳細は後述する）。 In the first case 23 and the second case 25, a spring (back door urging member) 37 having one end pressed against the inner bottom surface side of the first case 23 and the other end pressed against the inner bottom surface side of the second case 25, The back door body 11 is biased in the opening direction (details will be described later).

第２ケース２５内には、円筒状のシリンダ４１が配置される。このシリンダ４１の第２ケース２５の底部側には、周面におねじが形成されたねじ部４１ａが形成されている。このねじ部４１ａは、第２ケース２５の内部底面上に配置された円環状のリング４２の穴４２ａを挿通し、更に、第２ケース２５の底部に形成された穴２５ａを挿通し、外部に突出している。リング４２の穴４２ａを挿通したねじ部４１ａに、バックドア本体１１に回転可能に取り付けられる連結部材４４が螺合して取り付けられている。 A cylindrical cylinder 41 is disposed in the second case 25. On the bottom side of the second case 25 of the cylinder 41, a screw part 41a having a screw formed on the peripheral surface is formed. This threaded portion 41a is inserted through a hole 42a of an annular ring 42 disposed on the inner bottom surface of the second case 25, and further through a hole 25a formed in the bottom portion of the second case 25. It protrudes. A connecting member 44 that is rotatably attached to the back door body 11 is screwed and attached to a screw portion 41a that is inserted through the hole 42a of the ring 42.

ここで、図２を用いてシリンダ４１の説明を行う。シリンダ４１内には、粘性を有する流体（例えば、オイル）が封入されている。シリンダ４１内には、シリンダ４１内を移動するピストン４３が設けられている。このピストン４３により、シリンダ４１内は第１室ＦＲと、第２室ＳＲとに分けられる。 Here, the cylinder 41 will be described with reference to FIG. A viscous fluid (for example, oil) is enclosed in the cylinder 41. A piston 43 that moves within the cylinder 41 is provided in the cylinder 41. By this piston 43, the inside of the cylinder 41 is divided into a first chamber FR and a second chamber SR.

ロッド５１は、シリンダ４１内部から、シリンダ４１の第２ケース３７側の端面に形成された穴を挿通してシリンダ４１外部まで延びる大径部５１ａと、大径部５１ａに連設され、シリンダ４１内に配置される中径部５１ｂと、中径部５１ｂに連設され、シリンダ４１内に配置される小径部５１ｃとからなっている。そして、ピストン４３には、中心軸に沿って貫通した穴４９が形成されている。この穴４９の径は、ロッド５１の小径部５１ｃの径より若干大きく、更に、ロッド５１の中径部５１ｂの径より小さく形成されている。そして、ロッド５１の小径部５１ｃがピストン４３の穴４９へ挿通している。このため、
シリンダ４１の第１室ＦＲは、ロッド５１の小径部５１ｃが配置され、第２室ＳＲには、ロッド５１の中径部５１ｂ、大径部５１ａが配置される。 The rod 51 extends from the inside of the cylinder 41 through a hole formed in the end surface of the cylinder 41 on the second case 37 side and extends to the outside of the cylinder 41, and is connected to the large diameter portion 51a. The inner diameter portion 51b is arranged in the inside, and the small diameter portion 51c is provided in the cylinder 41 and connected to the middle diameter portion 51b. The piston 43 is formed with a hole 49 penetrating along the central axis. The diameter of the hole 49 is slightly larger than the diameter of the small diameter part 51 c of the rod 51, and further smaller than the diameter of the medium diameter part 51 b of the rod 51. The small diameter portion 51 c of the rod 51 is inserted into the hole 49 of the piston 43. For this reason,
In the first chamber FR of the cylinder 41, the small diameter portion 51c of the rod 51 is disposed, and in the second chamber SR, the medium diameter portion 51b and the large diameter portion 51a of the rod 51 are disposed.

ピストン４３には、第１室ＦＲ、第２室ＳＲを連通する第１流路４５、第２流路４７が形成されている。本実施形態では、第１流路４５と第２流路４７とは、管路抵抗が同じとなるように設定した。 The piston 43 is formed with a first flow path 45 and a second flow path 47 communicating with the first chamber FR and the second chamber SR. In the present embodiment, the first flow path 45 and the second flow path 47 are set to have the same pipe line resistance.

また、ピストン４３の外周には、シリンダ４１の内周面に押接し、第１室ＦＲ、第２室ＳＲからの流体の流出、もしくは流入を防ぐＯリング５３が設けられている。 In addition, an O-ring 53 is provided on the outer periphery of the piston 43 to press the inner peripheral surface of the cylinder 41 and prevent outflow or inflow of fluid from the first chamber FR and the second chamber SR.

ロッド５１の小径部５１ｃの第１室ＦＲに配置される部分には、第１流路４５の第１室ＦＲ側開口４５ａを塞ぐ第１バルブ６１が設けられている。第１バルブ６１は、ロッド５１の小径部５１ｃが挿通する穴６３ｃを有するリング部６３ａ、リング部６３ａに設けられ、第１流路４５の第１室ＦＲ側開口４５ａを塞ぐ弁体本体６３ｂからなる弁体６３と、ロッド５１の小径部５１ｃの先端部に取り付けられたリング６５と、ロッド５１の小径部６１ｃを巻回するように設けられ、一端部がリング６５に、他端部が弁体６３のリング部６３ａに押接し、弁体６３の弁体本体６３ｂを第１流路４５の第１室ＦＲ側開口４５ａを塞ぐ方向に付勢する第１弁体付勢スプリング（第１弁体付勢部材）６７とからなっている。 A first valve 61 that closes the first chamber FR side opening 45 a of the first flow path 45 is provided in a portion of the rod 51 that is disposed in the first chamber FR of the small diameter portion 51 c. The first valve 61 is provided in a ring portion 63a having a hole 63c through which the small diameter portion 51c of the rod 51 is inserted, and the valve body 63b that closes the first chamber FR side opening 45a of the first flow path 45. A valve body 63, a ring 65 attached to the tip of the small diameter portion 51c of the rod 51, and a small diameter portion 61c of the rod 51. The one end is the ring 65 and the other end is the valve. A first valve body urging spring (first valve) that presses against the ring portion 63a of the body 63 and urges the valve body 63b of the valve body 63 in a direction to close the first chamber FR side opening 45a of the first flow path 45. Body biasing member) 67.

ロッド５１の中径部５１ｂには、第２流路４７の第２流路の第２室ＳＲ側開口４７ａを塞ぐ第２バルブ７１が設けられている。第２バルブ７１は、ロッド５１の中径部５１ｂが挿通する穴７３ｃを有するリング部７３ａ、リング部７３ａに設けられ、第２流路４７の第２室ＳＲ側開口４７ａを塞ぐ弁体本体７３ｂからなる弁体７３と、ロッド５１の中径部５１ｂの大径部５１ａ側に設けられ、ロッド５１の中径部５１ｂ、大径部５１ａ間の立壁面５１ｄに当接可能なリング７５と、ロッド５１の中径部５１ｂを巻回するように設けられ、一端部がリング７５に、他端部が弁体７３のリング部７３ａに押接し、弁体７３の弁体本体７３ｂを第２流路４７の第２室ＳＲ側開口４７ａを塞ぐ方向に付勢する第２弁体付勢スプリング（第２弁体付勢部材）７７とからなっている。 A second valve 71 that closes the second chamber SR side opening 47 a of the second flow path of the second flow path 47 is provided in the middle diameter portion 51 b of the rod 51. The second valve 71 is provided in the ring portion 73a having the hole 73c through which the medium diameter portion 51b of the rod 51 is inserted, and the valve body 73b that closes the second chamber SR side opening 47a of the second flow path 47. And a ring 75 provided on the large diameter part 51a side of the medium diameter part 51b of the rod 51 and capable of contacting the standing wall surface 51d between the medium diameter part 51b and the large diameter part 51a of the rod 51, The rod 51 is provided so as to wind the intermediate diameter portion 51b, one end thereof is pressed against the ring 75, the other end is pressed against the ring portion 73a of the valve body 73, and the valve body 73b of the valve body 73 is passed through the second flow. It comprises a second valve body biasing spring (second valve body biasing member) 77 that biases the second chamber SR side opening 47a of the passage 47 in a direction to close it.

図１に戻って、ロッド５１の大径部５１ａの第１ケース２３の底部側には、周面におねじが形成されたねじ部５１ｅが形成されている。このねじ部５１ｅは、第１ケース２３の内部底面上に配置された円環状のリング７９の穴７９ａを挿通し、更に、第１ケース２３の底部に形成された穴２３ａを挿通し、外部に突出している。リング７９の穴７９ａを挿通したねじ部５１ｅに、車両本体１３に回転可能に取り付けられる連結部材８１が螺合して取り付けられている。 Returning to FIG. 1, a screw portion 51 e having a screw formed on the peripheral surface is formed on the bottom side of the first case 23 of the large-diameter portion 51 a of the rod 51. This threaded portion 51e is inserted through a hole 79a in an annular ring 79 disposed on the inner bottom surface of the first case 23, and further through a hole 23a formed in the bottom portion of the first case 23. It protrudes. A connecting member 81 that is rotatably attached to the vehicle main body 13 is screwed and attached to a screw portion 51e that is inserted through the hole 79a of the ring 79.

前述したスプリング３７は、シリンダ４１、ロッド５１を巻回し、一端部が第１ケース２３内のリング７９に押接し、他端部が第２ケース２５内のリング４２に押接している。 The above-described spring 37 is wound around the cylinder 41 and the rod 51, and has one end pressed against the ring 79 in the first case 23 and the other end pressed against the ring 42 in the second case 25.

また、ピストン４３とピストン４３に取り付けられたロッド５１とは、一端部が車両本体１３に回転可能に取り付けられ、他端部側がシリンダ４１に係合し、シリンダ４１の中心軸に沿って移動可能に設けられた移動部材として機能する。 Further, one end of the piston 43 and the rod 51 attached to the piston 43 is rotatably attached to the vehicle main body 13, the other end engages with the cylinder 41, and can move along the center axis of the cylinder 41. It functions as a moving member provided in.

そして、本実施形態では、第１弁体付勢スプリング６７の付勢力を第２弁体付勢スプリング７７の付勢力より弱く設定した。 In this embodiment, the urging force of the first valve element urging spring 67 is set to be weaker than the urging force of the second valve element urging spring 77.

ここで、上記構成のステー２１の作動を説明する。バックドア本体１１が開方向に回転する場合、図２において、ピストン４３は右側に移動する。ピストン４３が右側に移動すると、第２室ＳＲ内の圧力が上がり、第１室ＦＲ内の圧力が下がる。よって、第２室ＳＲ内の圧力は第１流路４５を介して、第１流路４５の開口４５ａを塞ぐ第１バルブ６１の弁体本体６３ｂに作用する。第１バルブ６１の第１弁体付勢スプリング６７の付勢力より、第２室ＳＲ内の圧力が大きくなると、第１バルブ６１は開き、第２室ＳＲ内の液体が第１室ＦＲ内に移動し、第１室ＦＲ内の圧力と第２室ＳＲ内の圧力とが同じとなる。 Here, the operation of the stay 21 configured as described above will be described. When the back door body 11 rotates in the opening direction, the piston 43 moves to the right in FIG. When the piston 43 moves to the right side, the pressure in the second chamber SR increases and the pressure in the first chamber FR decreases. Therefore, the pressure in the second chamber SR acts on the valve body 63 b of the first valve 61 that closes the opening 45 a of the first flow path 45 via the first flow path 45. When the pressure in the second chamber SR becomes larger than the urging force of the first valve body urging spring 67 of the first valve 61, the first valve 61 opens and the liquid in the second chamber SR enters the first chamber FR. The pressure in the first chamber FR is the same as the pressure in the second chamber SR.

逆に、バックドア本体１１が閉方向に回転する場合、図２において、ピストン４３は左側に移動する。ピストン４３が左側に移動すると、第１室ＦＲ内の圧力が上がり、第２室ＳＲ内の圧力が下がる。よって、第１室ＦＲ内の圧力は第２流路４７を介して、第２流路４７の開口４７ａを塞ぐ第２バルブ７１の弁体本体７３ｂに作用する。第２バルブ７１の第２弁体付勢スプリング７７の付勢力より、第１室ＦＲ内の圧力が大きくなると、第２バルブ７１は開き、第１室ＦＲ内の液体が第２室ＳＲ内に移動し、第１室ＦＲ内の圧力と第２室ＳＲ内の圧力とが同じとなる。 Conversely, when the back door body 11 rotates in the closing direction, the piston 43 moves to the left in FIG. When the piston 43 moves to the left side, the pressure in the first chamber FR increases and the pressure in the second chamber SR decreases. Therefore, the pressure in the first chamber FR acts on the valve body 73 b of the second valve 71 that closes the opening 47 a of the second channel 47 via the second channel 47. When the pressure in the first chamber FR becomes larger than the biasing force of the second valve body biasing spring 77 of the second valve 71, the second valve 71 opens and the liquid in the first chamber FR enters the second chamber SR. The pressure in the first chamber FR is the same as the pressure in the second chamber SR.

本実施形態では、第１弁体付勢スプリング６７の付勢力を第２弁体付勢スプリング７７の付勢力より弱く設定した。よって、バックドア本体１１が閉方向に回転する時に発生させる抵抗をA、バックドア本体１１が開方向に回転する時に発生させる抵抗をBとした時、常にA＞Bとなる。 In this embodiment, the biasing force of the first valve body biasing spring 67 is set to be weaker than the biasing force of the second valve body biasing spring 77. Therefore, when the resistance generated when the back door body 11 rotates in the closing direction is A and the resistance generated when the back door body 11 rotates in the opening direction is B, A> B always holds.

そして、ピストン４３に設けられ、第１室ＦＲ、第２室ＳＲを連通する第１流路４５、第２流路４７と、第１バルブ６１と、第２バルブ７１とで、バックドア本体１１が閉方向に回転する時に発生させる抵抗をA、バックドア本体１１が開方向に回転する時に発生させる抵抗をBとした時、常にA＞Bとなる抵抗発生手段が構成されている。 The back door body 11 includes a first flow path 45, a second flow path 47, a first valve 61, and a second valve 71 that are provided in the piston 43 and communicate with the first chamber FR and the second chamber SR. The resistance generating means is always configured such that A> B, where A is the resistance generated when the motor rotates in the closing direction and B is the resistance generated when the back door body 11 rotates in the opening direction.

次に、図５を用いてステー１２１を説明する。ステー１２１は、一方の端面が開放面となった有底円筒状の第１ケース１２３と、一方の端面が開放面となり、内径が第１ケース１２３の外径より大きな有底円筒状の第２ケース１２５とを有している。 Next, the stay 121 will be described with reference to FIG. The stay 121 includes a bottomed cylindrical first case 123 with one end surface being an open surface, and a bottomed cylindrical second case with one end surface being an open surface and an inner diameter larger than the outer diameter of the first case 123. And a case 125.

そして、第１ケース１２３の開放面と、第２ケース１２５の開放面とが対向するように、両者は嵌合し、第２ケース１２５は第１ケース１２３に対して進退可能となっている。 And both are fitted so that the open surface of the 1st case 123 and the open surface of the 2nd case 125 may oppose, and the 2nd case 125 can advance and retreat with respect to the 1st case 123.

第１ケース１２３には駆動源としてのモータ１２７が設けられている。また、このモータ１２７の出力軸１２７ａには、カップリング１２９を介して、ねじ棒１３１が取り付けられている。 The first case 123 is provided with a motor 127 as a drive source. A screw rod 131 is attached to the output shaft 127 a of the motor 127 through a coupling 129.

ねじ棒１３１は、周面におねじが形成されたねじ棒本体部１３１ａとねじ棒本体部１３１ａのモータ１２７側に形成され、ねじ棒本体部１３１ａより径が小さい基部１３１ｂとからなっている。基部１３１ｂは、第１ケース１２３の内部に設けられた軸受１３３に回転可能に支持されている。そして、ねじ棒１３１の基部１３１ｂは、カップリング１２９を介してモータ１２７の出力軸１２７ａに接続されている。 The screw rod 131 includes a screw rod main body portion 131a having a screw formed on the peripheral surface thereof and a base portion 131b formed on the motor 127 side of the screw rod main body portion 131a and having a smaller diameter than the screw rod main body portion 131a. The base 131b is rotatably supported by a bearing 133 provided inside the first case 123. The base 131 b of the screw rod 131 is connected to the output shaft 127 a of the motor 127 via the coupling 129.

第２ケース１２５の底部の内面には、内面にめねじが形成された円筒状のナット部材１３５が設けられている。そして、ナット部材１３５のめねじが、ねじ棒１３１のねじ棒本体部１３１ａに螺合している
第１ケース１２３の底部の外面には、車両本体１３へ回転可能に取り付けられる連結部１２３ａが形成されている。第２ケース１２５の底部の外面には、バックドア本体１１へ回転可能に取り付けられる連結部１２５ａが形成されている。 A cylindrical nut member 135 having an internal thread formed on the inner surface is provided on the inner surface of the bottom of the second case 125. Then, the female thread of the nut member 135 is screwed into the threaded rod body 131a of the threaded rod 131, and a connecting portion 123a that is rotatably attached to the vehicle body 13 is formed on the outer surface of the first case 123. Has been. A connecting portion 125 a that is rotatably attached to the back door body 11 is formed on the outer surface of the bottom portion of the second case 125.

そして、一端部が第２ケース１２５の底部内面に押接し、他端部が第１ケース１２３の内周面に形成されたつば部１２３ｂに押接するスプリング１３７が設けられている。このスプリング１３７の付勢力により、第２ケース１２５の底部（先端部）は第１ケース１２３から離れる方向（バックドア本体１１を開く方向）に付勢されている。 A spring 137 having one end pressed against the inner surface of the bottom of the second case 125 and the other end pressed against the flange 123 b formed on the inner peripheral surface of the first case 123 is provided. By the biasing force of the spring 137, the bottom portion (tip portion) of the second case 125 is biased in a direction away from the first case 123 (a direction in which the back door body 11 is opened).

ここで、上記構成のステー１２１の作動を説明する。連結部１２３ａ、連結部１２５ａがバックドア本体１１または車両本体１３への取り付けられると、バックドア本体１１の開閉に応じて、連結部１２３ａ、連結部１２５ａはバックドア本体１１，車両本体１３に対して回転するが、第１ケース１２３、第２ケース１２５のねじ棒１３１を中心軸とする回転（自転）は禁止される。 Here, the operation of the stay 121 configured as described above will be described. When the connecting portion 123a and the connecting portion 125a are attached to the back door main body 11 or the vehicle main body 13, the connecting portion 123a and the connecting portion 125a are connected to the back door main body 11 and the vehicle main body 13 according to the opening and closing of the back door main body 11. However, rotation (spinning) around the screw rod 131 of the first case 123 and the second case 125 as the central axis is prohibited.

モータ１２７が駆動されると、ねじ棒１３１が回転する。第２ケース１２５の自転は禁止されているので、ねじ棒１３１に螺合するナット部材３５を有する第２ケース１２５は、第１ケース１２３ｂに対して進退し、バックドア本体１１が車両本体１３に対して回転する。 When the motor 127 is driven, the screw rod 131 rotates. Since rotation of the second case 125 is prohibited, the second case 125 having the nut member 35 screwed to the screw rod 131 moves forward and backward with respect to the first case 123b, and the back door main body 11 moves to the vehicle main body 13. Rotate against.

上記構成によれば、抵抗発生手段は、バックドア本体１１が閉方向に回転する時に発生させる抵抗をA、バックドア本体１１が開方向に回転する時に発生させる抵抗をBとした時、常にA＞Bであることにより、全開時において、閉方向への抵抗が大きいので、全開状態を保持する付勢部材であるスプリング３７、１３７の付勢力が少なくてすむ。よって、スプリング３７，１３７を小型にでき、ステー２１、１２１も小型化できる。 According to the above configuration, the resistance generating means is always A when the resistance generated when the back door body 11 rotates in the closing direction is A and the resistance generated when the back door body 11 rotates in the opening direction is B. When> B, since the resistance in the closing direction is large when fully open, the urging force of the springs 37 and 137 that are urging members that hold the fully open state can be reduced. Therefore, the springs 37 and 137 can be reduced in size, and the stays 21 and 121 can also be reduced in size.

また、バックドア本体１１を開方向に回転させるモーメントと閉方向に回転させるモーメントが等しくなるように抵抗発生手段の抵抗A、抵抗Bを設定すれば、バックドア本体１１を任意の位置で保持することができる。 Further, if the resistance A and the resistance B of the resistance generating means are set so that the moment for rotating the back door body 11 in the opening direction is equal to the moment for rotating the back door body 11 in the closing direction, the back door body 11 is held at an arbitrary position. be able to.

尚、本実施形態では、第１流路４５と第２流路４７とは、管路抵抗が同じとなるように設定したが、厳密に管路抵抗が同じである必要はなく、バックドア本体１１が閉方向に回転する時に発生させる抵抗をA、バックドア本体１１が開方向に回転する時に発生させる抵抗をBとした時、常にA＞Bとなる範囲で、第１流路４５と第２流路４７との管路抵抗は異なっていてもよい。
＜第２実施形態＞
第２実施形態の抵抗発生手段を示す図６を用いて説明する。 In the present embodiment, the first flow path 45 and the second flow path 47 are set to have the same pipe resistance, but the pipe resistance does not have to be strictly the same, and the back door body The first flow path 45 and the first flow path 45 are within the range of A> B, where A is the resistance generated when the 11 rotates in the closing direction and B is the resistance generated when the back door body 11 rotates in the opening direction. The pipe line resistance with the two flow paths 47 may be different.
Second Embodiment
A description will be given with reference to FIG. 6 showing the resistance generating means of the second embodiment.

本実施形態と第１実施形態との相違点は、抵抗発生手段であり、他の部分は同一である。よって、第１実施形態と同一部分には同一符号を付し、重複する説明を省略する。 The difference between this embodiment and 1st Embodiment is a resistance generation means, and other parts are the same. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

本実施形態のピストン２４３には、第１室ＦＲ、第２室ＳＲを連通する第１流路２４５、第２流路２４７が形成されている。本実施形態では、第１流路２４５の径を第２流路２４７の径より大きく設定し、第１流路２４５の管路抵抗を第２流路２４７の管路抵抗より小さくした。 In the piston 243 of the present embodiment, a first flow path 245 and a second flow path 247 communicating with the first chamber FR and the second chamber SR are formed. In the present embodiment, the diameter of the first flow path 245 is set larger than the diameter of the second flow path 247, and the pipe resistance of the first flow path 245 is made smaller than the pipe resistance of the second flow path 247.

また、第１バルブ２６１は、ロッド５１の小径部５１ｃが挿通する穴２６３ａを有するリング部２６３ａ、リング部２６３ａに設けられ、第１流路２４５の第１室ＦＲ側開口２４５ａを塞ぐ弁体本体２６３ｂからなる弁体２６３と、ロッド５１の小径部５１ｃの先端部に取り付けられたリング２６５と、ロッド５１の小径部５１ｃを巻回するように設けられ、一端部がリング２６５に、他端部が弁体２６３のリング部２６３ａに押接し、弁体２６３の弁体本体２６３ｂを第１流路２４５の第１室ＦＲ側開口２４５ａを塞ぐ方向に付勢する第１弁体付勢スプリング（第１弁体付勢部材）２６７とからなっている。本実施形態では、第１弁体付勢スプリング２６７と第２弁体付勢スプリング７７とは、付勢力が同じになるように設定した。 Further, the first valve 261 is provided in the ring part 263a having the hole 263a through which the small diameter part 51c of the rod 51 is inserted, and the ring part 263a, and the valve body main body closing the first chamber FR side opening 245a of the first flow path 245. A valve body 263 made of 263b, a ring 265 attached to the tip of the small diameter portion 51c of the rod 51, and a small diameter portion 51c of the rod 51 provided so as to be wound, with one end on the ring 265 and the other end Presses against the ring portion 263a of the valve body 263, and urges the valve body 263b of the valve body 263 in a direction to close the first chamber FR side opening 245a of the first flow path 245 (first valve body urging spring (first 1 valve body urging member) 267. In the present embodiment, the first valve body biasing spring 267 and the second valve body biasing spring 77 are set to have the same biasing force.

よって、バックドア本体１１が閉方向に回転する時に発生させる抵抗をA、バックドア本体１１が開方向に回転する時に発生させる抵抗をBとした時、常にA＞Bとなる。 Therefore, when the resistance generated when the back door body 11 rotates in the closing direction is A and the resistance generated when the back door body 11 rotates in the opening direction is B, A> B always holds.

そして、ピストン２４３に設けられ、第１室ＦＲ、第２室ＳＲを連通する第１流路２４５、第２流路２４７と、第１バルブ２６１と、第２バルブ７１とで、バックドア本体１１が閉方向に回転する時に発生させる抵抗をA、バックドア本体１１が開方向に回転する時に発生させる抵抗をBとした時、常にA＞Bとなる抵抗発生手段が構成されている。 The back door body 11 includes a first flow path 245, a second flow path 247, a first valve 261, and a second valve 71 that are provided in the piston 243 and communicate with the first chamber FR and the second chamber SR. The resistance generating means is always configured such that A> B, where A is the resistance generated when the motor rotates in the closing direction and B is the resistance generated when the back door body 11 rotates in the opening direction.

上記構成においても、抵抗発生手段は、バックドア本体１１が閉方向に回転する時に発生させる抵抗をA、バックドア本体１１が開方向に回転する時に発生させる抵抗をBとした時、常にA＞Bであることにより、全開時において、閉方向への抵抗が大きいので、全開状態を保持する付勢部材であるスプリング３７、１３７の付勢力が少なくてすむ。よって、スプリング３７，１３７を小型にでき、ステー２１、１２１も小型化できる。 Also in the above configuration, the resistance generating means is always A> when the resistance generated when the back door body 11 rotates in the closing direction is A and the resistance generated when the back door body 11 rotates in the opening direction is B. By being B, since the resistance in the closing direction is large when fully opened, the urging force of the springs 37 and 137 that are urging members that hold the fully opened state can be reduced. Therefore, the springs 37 and 137 can be reduced in size, and the stays 21 and 121 can also be reduced in size.

尚、本実施形態では、第１弁体付勢スプリング２６７と第２弁体付勢スプリング７７とは、付勢力が同じになるように設定したが、厳密に付勢力が同じである必要はなく、バックドア本体１１が閉方向に回転する時に発生させる抵抗をA、バックドア本体１１が開方向に回転する時に発生させる抵抗をBとした時、常にA＞Bとなる範囲で、第１弁体付勢スプリング２６７と第２弁体付勢スプリング７７との付勢力は異なっていてもよい。
＜第３実施形態＞
本実施形態と第１実施形態との相違点は、抵抗発生手段であり、他の部分は同一である。よって、第１実施形態と同一部分には同一符号を付し、重複する説明を省略する。 In the present embodiment, the first valve body urging spring 267 and the second valve body urging spring 77 are set to have the same urging force. However, the urging force is not necessarily strictly the same. When the resistance generated when the back door body 11 rotates in the closing direction is A and the resistance generated when the back door body 11 rotates in the opening direction is B, the first valve is always in the range of A> B. The biasing force of the body biasing spring 267 and the second valve body biasing spring 77 may be different.
<Third Embodiment>
The difference between this embodiment and 1st Embodiment is a resistance generation means, and other parts are the same. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

本実施形態のピストン３４３には、第１室ＦＲ、第２室ＳＲを連通する第１流路３４５、第２流路３４７が形成されている。 In the piston 343 of the present embodiment, a first flow path 345 and a second flow path 347 communicating with the first chamber FR and the second chamber SR are formed.

第１流路３４５は、第１室ＦＲ側の開口を有し、内部に行くほど径が漸次的に小さくなる円錐部３４５ａと、円錐部３４５ａに連設され、径が一定の小径部３４５ｂと、小径部３４５ｂに連設され、第２室ＳＲ側の開口を有する大径部３４５ｃとからなっている。 The first flow path 345 has an opening on the first chamber FR side, a conical portion 345a having a diameter that gradually decreases toward the inside, and a small diameter portion 345b that is connected to the conical portion 345a and has a constant diameter. The large-diameter portion 345c is connected to the small-diameter portion 345b and has an opening on the second chamber SR side.

第１流路３４５には、第１バルブ３６１の弁体３６３が設けられる。この弁体３６３は、第１流路３４５の円錐部３４５ａに嵌合可能な円錐部３６３ａと、円錐部３６３ａに連設され、第１流路３４５の小径部３４５ｂに、軸方向に移動可能に嵌合した中間部３６３ｂと、中間部３６３ｂに連設され、第１流路３４５の大径部３４５ｃに嵌合する抜け止め部３６３ｃとからなっている。中間部３６３ｂの軸方向の長さは、第１流路３４５の小径部３４５ｂの軸方向の長さより長く設定されている。中間部３６３ｂの径は、第１流路３４５の径より若干短く設定されている。第２室ＳＲ側に行くほど径が漸次的に小さくなる円錐状となっている。更に、中間部３６３ｂ、抜け止め部３６３ｃには、軸方向に沿う４つの切り欠きが形成されている。そして、抜け止め部３６３ｃは、第１流路３４５の大径部３４５ｃの底面（第１流路３４５の小径部３４５ｂと大径部３４５ｃとの段部）３４５ｄに当接可能な抜け止め面３６３ｄを有している。 The first flow path 345 is provided with a valve body 363 of the first valve 361. The valve body 363 is connected to the conical portion 363a that can be fitted into the conical portion 345a of the first flow path 345 and the conical portion 363a, and is movable in the axial direction to the small diameter portion 345b of the first flow path 345. The intermediate portion 363b is fitted, and a retaining portion 363c that is connected to the intermediate portion 363b and is fitted to the large diameter portion 345c of the first flow path 345. The axial length of the intermediate portion 363b is set longer than the axial length of the small diameter portion 345b of the first flow path 345. The diameter of the intermediate part 363b is set slightly shorter than the diameter of the first flow path 345. It has a conical shape in which the diameter gradually decreases toward the second chamber SR. Furthermore, four notches along the axial direction are formed in the intermediate portion 363b and the retaining portion 363c. The retaining portion 363c is a retaining surface 363d that can come into contact with the bottom surface (the step portion between the small diameter portion 345b and the large diameter portion 345c of the first flow path 345) 345d of the large diameter portion 345c of the first flow path 345. have.

ここで、本実施形態の作動を説明する。バックドア本体１１が開方向に回転する場合、図７において、ピストン３４３は右側に移動する。ピストン３４３が右側に移動すると、第２室ＳＲ内の圧力が上がり、第１室ＦＲ内の圧力が下がる。よって、第２室ＳＲ内の圧力は第１流路２４５を介して、第１流路３４５を塞ぐ第１バルブ３６１の弁体３６３に作用し、弁体３６３は第１室ＦＲ側に移動し、第１バルブ６１は開き、第２室ＳＲ内の液体が第１室ＦＲ内に移動し、第１室ＦＲ内の圧力と第２室ＳＲ内の圧力とが同じとなる。 Here, the operation of the present embodiment will be described. When the back door body 11 rotates in the opening direction, the piston 343 moves to the right in FIG. When the piston 343 moves to the right side, the pressure in the second chamber SR increases and the pressure in the first chamber FR decreases. Therefore, the pressure in the second chamber SR acts on the valve body 363 of the first valve 361 that closes the first flow path 345 via the first flow path 245, and the valve body 363 moves to the first chamber FR side. The first valve 61 is opened, the liquid in the second chamber SR moves into the first chamber FR, and the pressure in the first chamber FR and the pressure in the second chamber SR become the same.

逆に、バックドア本体１１が閉方向に回転する場合、図７において、ピストン３４３は左側に移動する。ピストン３４３が左側に移動すると、第１室ＦＲ内の圧力が上がり、第２室ＳＲ内の圧力が下がる。よって、第１室ＦＲ内の圧力は第２流路３４７を介して、第２流路３４７の開口３４７ａを塞ぐ第２バルブ７１の弁体本体７３ｂに作用する。第２バルブ７１の第２弁体付勢スプリング７７の付勢力より、第１室ＦＲ内の圧力が大きくなると、第２バルブ７１は開き、第１室ＦＲ内の液体が第２室ＳＲ内に移動し、第１室ＦＲ内の圧力と第２室ＳＲ内の圧力とが同じとなる。尚、この際、第１バルブ３６１の弁体３６３は、第１室ＦＲ内の圧力により、第２室ＳＲ側に移動し、弁体３６３の円錐部３６３ａが第１流路３４５の円錐部３４５ａに嵌合し、閉じた状態となる。 Conversely, when the back door body 11 rotates in the closing direction, the piston 343 moves to the left in FIG. When the piston 343 moves to the left side, the pressure in the first chamber FR increases and the pressure in the second chamber SR decreases. Therefore, the pressure in the first chamber FR acts on the valve body 73b of the second valve 71 that closes the opening 347a of the second channel 347 via the second channel 347. When the pressure in the first chamber FR becomes larger than the biasing force of the second valve body biasing spring 77 of the second valve 71, the second valve 71 opens and the liquid in the first chamber FR enters the second chamber SR. The pressure in the first chamber FR is the same as the pressure in the second chamber SR. At this time, the valve body 363 of the first valve 361 moves to the second chamber SR side due to the pressure in the first chamber FR, and the conical portion 363a of the valve body 363 is moved to the conical portion 345a of the first flow path 345. And is in a closed state.

即ち、第１バルブ３６１は、第１流路３４５に設けられ、第２室ＳＲから第１室ＦＲへの流体の流れを許容し、第１室ＦＲから第２室ＳＲへの流体の流れを禁止する一方向バルブとなっている。 That is, the first valve 361 is provided in the first flow path 345, allows the flow of fluid from the second chamber SR to the first chamber FR, and allows the fluid flow from the first chamber FR to the second chamber SR. It is a prohibited one-way valve.

そして、ピストン３４３に設けられ、第１室ＦＲ、第２室ＳＲを連通する第１流路３４５、第２流路３４７と、第１バルブ３６１と、第２バルブ７１とで、バックドア本体１１が閉方向に回転する時に発生させる抵抗をA、バックドア本体１１が開方向に回転する時に発生させる抵抗をBとした時、常にA＞Bとなる抵抗発生手段が構成されている。 The back door body 11 includes a first flow path 345, a second flow path 347, a first valve 361, and a second valve 71 that are provided in the piston 343 and communicate with the first chamber FR and the second chamber SR. The resistance generating means is always configured such that A> B, where A is the resistance generated when the motor rotates in the closing direction and B is the resistance generated when the back door body 11 rotates in the opening direction.

また、バックドア本体１１を開方向に回転させるモーメントと閉方向に回転させるモーメントが等しくなるように抵抗発生手段の抵抗A、抵抗Bを設定すれば、バックドア本体１１を任意の位置で保持することができる。
＜第４実施形態＞
第１−第３実施形態の抵抗発生手段は、第１室ＦＲ、第２室ＳＲを連通する流路は二つの場合で説明したが、二つに限定するものではない。 Further, if the resistance A and the resistance B of the resistance generating means are set so that the moment for rotating the back door body 11 in the opening direction is equal to the moment for rotating the back door body 11 in the closing direction, the back door body 11 is held at an arbitrary position. be able to.
<Fourth embodiment>
Although the resistance generating means of the first to third embodiments has been described in the case where there are two flow paths communicating with the first chamber FR and the second chamber SR, it is not limited to two.

ピストンに管路抵抗が等しい３つ以上の流路を設け、第１室に設けられ流路の第１室ＳＲ側開口を塞ぐ第１室側弁体，第１室側弁体を開口を塞ぐ方向に付勢する第１室側弁体付勢部材からなる第１室側バルブと、第２室ＳＲに設けられ流路の第２室ＳＲ側開口を塞ぐ第２室側弁体，第２室側弁体を開口を塞ぐ方向に付勢し、付勢力が第１室側弁体付勢部材と同じ第２室側弁体付勢部材からなる第２室側バルブとを設け、第１室側バルブの数を第２室側バルブの数より少なくした抵抗発生手段てもよい。 The piston is provided with three or more flow paths having equal pipe resistance, and is provided in the first chamber to block the first chamber SR side opening of the flow path, and the first chamber side valve body is closed. A first chamber side valve composed of a first chamber side valve body urging member that urges in the direction, a second chamber side valve body provided in the second chamber SR and closing the second chamber SR side opening of the flow path, A first chamber side valve body urging member that urges the chamber side valve body in a direction to close the opening, and the urging force is the same as the first chamber side valve body urging member; Resistance generating means may be used in which the number of chamber side valves is smaller than the number of second chamber side valves.

尚、本実施形態では、第１室側バルブの第１室側弁体付勢部材と、第２室側バルブの第２室側弁体付勢部材とは、付勢力が同じになるように設定したが、厳密に付勢力が同じである必要はなく、バックドア本体１１が閉方向に回転する時に発生させる抵抗をA、バックドア本体１１が開方向に回転する時に発生させる抵抗をBとした時、常にA＞Bとなる範囲で、第１室側弁体付勢部材と、第２室側弁体付勢部材との付勢力は異なっていてもよい。 In the present embodiment, the first chamber side valve body biasing member of the first chamber side valve and the second chamber side valve body biasing member of the second chamber side valve have the same biasing force. Although the urging force does not have to be exactly the same, A is a resistance generated when the back door body 11 is rotated in the closing direction, and B is a resistance generated when the back door body 11 is rotated in the opening direction. In this case, the urging forces of the first chamber side valve body urging member and the second chamber side valve body urging member may be different within a range where A> B is always satisfied.

また、上記第１実施形態−第４実施形態では、ステーは車両本体１３の左側、右側にそれぞれ一つ設けた例で説明したが、左側は複数，右側１つ、または、左側は一つ，右側は複数、あるいは、右、左側それぞれ複数設けてもよい。 Further, in the first to fourth embodiments, the description has been given of the example in which one stay is provided on each of the left and right sides of the vehicle body 13, but a plurality of left sides, one on the right side, or one on the left side, A plurality of right sides or a plurality of right and left sides may be provided.

１１バックドア本体
１３車両本体
２１ステー 11 Back door body 13 Vehicle body 21 Stay

Claims

A back door body provided on the vehicle body so as to be vertically rotatable;
At least one is provided on at least one of the left side and the right side, and one end is rotatably attached to the vehicle body and the other end is rotatably attached to the back door. The back door body is attached in the opening direction. A stay having a back door urging member for energizing;
Have
The at least one stay is
A cylinder rotatably attached to either one of the vehicle body and the back door body;
A moving member provided with one end rotatably attached to the other of the vehicle main body and the back door main body, the other end engaging with the cylinder, and being movable along the central axis of the cylinder; ,
Resistance generating means for generating a resistance between the moving member and the cylinder;
Consists of
The resistance generating means includes
When the resistance generated when the back door body rotates in the closing direction is A, and the resistance generated when the back door body rotates in the opening direction is B,
Backdoor characterized by always A> B.

Fluid is enclosed in the cylinder,
The moving member is
A piston provided in the cylinder and dividing the cylinder into a first chamber and a second chamber;
One end is rotatably attached to the other of the vehicle body and the back door, and the other end is a rod attached to the piston;
A flow path communicating the first chamber and the second chamber;
The back door according to claim 1, comprising:

The resistance generating means includes
A first flow path, a second flow path, which are provided in the piston, communicate with the first chamber and the second chamber, and have the same pipe line resistance;
A first valve body provided in the first chamber for closing the first chamber side opening of the first flow path, and a first valve body biasing member for biasing the first valve body in a direction for closing the opening. A first valve;
A second valve body provided in the second chamber for closing the second chamber side opening of the second flow path; and a second valve body biasing member for biasing the second valve body in a direction to close the opening. A second valve;
Have
The back door according to claim 2, wherein the urging force of the first valve body urging member is weaker than the urging force of the second valve body urging member.

The resistance generating means includes
A first flow path provided in the piston and communicating with the first chamber and the second chamber; a second flow path;
A first valve body provided in the first chamber for closing the first chamber side opening of the first flow path, and a first valve body biasing member for biasing the first valve body in a direction for closing the opening. A first valve;
A second valve body provided in the second chamber and closing the second chamber side opening of the second flow path, urging the second valve body in a direction closing the opening, and the urging force is applied to the first valve body. A second valve composed of the same second valve body biasing member as the biasing member;
Have
3. The back door according to claim 2, wherein the pipe resistance of the first flow path is made smaller than the pipe resistance of the second flow path.

The resistance generating means includes
A first flow path provided in the piston and communicating with the first chamber and the second chamber; a second flow path;
A one-way valve provided in the first flow path, allowing a flow of the fluid from the second chamber to the first chamber and prohibiting a flow of the fluid from the first chamber to the second chamber; ,
A valve body that is provided in the second chamber and that closes the second chamber side opening of the second flow path, and a valve body biasing member that biases the valve body in a direction to close the opening;
The back door according to claim 2, comprising:

The resistance generating means includes
Three or more flow paths provided in the piston and communicating with the first chamber and the second chamber having the same pipe line resistance;
Provided in the first chamber is a first chamber side valve body that closes the first chamber side opening of the flow path, and a first chamber side valve body that biases the first chamber side valve body in the direction of closing the opening. A first chamber side valve comprising a force member;
A second chamber side valve body provided in the second chamber and closing the second chamber side opening of the flow path, urging the second chamber side valve body in a direction closing the opening, and the urging force is applied to the first chamber The second chamber side valve consisting of the same second chamber side valve body biasing member as the chamber side valve body biasing member,
The back door according to claim 2, wherein the number of first chamber side valves is smaller than the number of second chamber side valves.

The stay, the back door according to any one of claims 1 to 6, characterized in that it is driven by a motor