JP4064010B2

JP4064010B2 - Rotating damper

Info

Publication number: JP4064010B2
Application number: JP21971799A
Authority: JP
Inventors: 達也早川
Original assignee: Sugatsune Kogyo Co Ltd
Current assignee: Sugatsune Kogyo Co Ltd
Priority date: 1999-08-03
Filing date: 1999-08-03
Publication date: 2008-03-19
Anticipated expiration: 2019-08-03
Also published as: JP2001050326A

Description

【０００１】
【発明の属する技術分野】
この発明は、例えば便器本体と弁蓋との間に設けられ、弁蓋の開回動時には高速回動を許容し、閉回動時には回動速度を低速に抑える回転ダンパに関する。
【０００２】
【従来の技術】
従来のこの種の回転ダンパの一例が実用新案登録第２５０２０４２号公報に記載されている。この回転ダンパは、図５および図６に示すように、回転軸線Ｌを中心として相対回転自在に連結された一対の回転部材１，２を備えている。回転部材１，２の互いに離間する側の端部には、連結部１１，２１がそれぞれ形成されている。一方の連結部１１は、例えば便器本体（図示せず）に連結され、他方の連結部２１は弁蓋（図示せず）に連結される。勿論、連結関係が逆になることもある。
【０００３】
また、回転部材１，２には、軸線を回転軸線Ｌと一致させた筒部１２と軸部２２とがそれぞれ設けられている。筒部１２の内周面と軸部２２の外周面との間には、環状の収容室３が形成されている。この収容室３には、流体が収容されている。通常、流体としては粘性流体が用いられる。また、収容室３内には、仕切壁部５、弁羽根６および弁部材７が配置されている。
【０００４】
仕切壁部５は、筒部１２に一体に形成されており、筒部１２の内周面から径方向内側へ突出している。仕切壁部５の先端部は軸部２２の外周面に摺動自在に接している。
【０００５】
弁羽根６は、軸部２２に一体に形成されており、軸部２２の外周面から径方向外側に突出している。弁羽部６の先端部には、切欠き部６１が形成されている。この弁羽根６と仕切壁部５とは、収容室３の周方向に互いに離れており、両者によって収容室３が第１，第２の室３Ａ，３Ｂに二分されている。
【０００６】
弁部材７は、弁羽根６と筒部１２の内周面との間に配置されており、筒部１２の内周面に摺動可能に接触している。収容室３の周方向における弁部材７の両端部には、軸部２２側へ突出する一対の弁部７１，７２が形成されている。一方の弁部には切欠き部７２ａが形成されている。
【０００７】
上記構成の回転ダンパにおいて、回転部材１（筒部１２）が回転部材２に対して図６の反時計方向へ相対回転すると、第１の室３Ａ内の粘性流体が仕切壁部５によって押されて第２の室３Ｂ側へ流れる。すると、弁部材７が粘性流体によって押されて同方向へ移動する。弁部材７の弁部７１が弁羽根６に突き当たると、弁羽根６の切欠き部６１が弁部７１によって遮蔽される。この結果、第１の室３Ａから第２の室３Ｂに流入する粘性流体の流通抵抗が増大し、回転部材１，２の相対回転が低速に抑えられる。なお、第１の室３Ａ内の粘性流体は、弁部７１と弁羽根６との接触面間の僅かな隙間、仕切壁部５と軸部１２との間の僅かな隙間、あるいは仕切壁部５に形成されたオリフィス（図示せず）を通って第２の室３Ｂに流入するようになっている。
【０００８】
一方、回転部材１が時計方向へ相対回転した場合には、第２の室３Ｂ内の粘性流体が第１の室３Ａに向って流れる。粘性流体によって弁部材７が押されて同方向へ移動し、弁部７２が弁羽根６に突き当たる。しかるに、このときには弁羽根６の切欠き部６１と弁部材７の切欠き部７２ａとが互いに対向して連通する。したがって、粘性流体はほとんど抵抗なく流れる。よって、回転部材１，２は自由に回転することができる。
【０００９】
【発明が解決しようとする課題】
弁部材７は、回転部材１，２の回転開始当初は回転部材１と一緒に回転する。しかし、弁部７１または７２が弁羽根６に突き当たって停止した後は回転部材１に対して相対回転する。このため、筒部１２の内周面によって擦過される。特に、回転部材１が反時計方向へ回転するときには、第１の室３Ａ内から第２の室３Ｂへの粘性流体の流れが阻害される結果、第１の室３Ａ内の粘性流体の圧力が高圧になる。この高圧によって弁部材７が筒部１２の内周面に押し付けられる。このため、弁部材７が早期に摩耗するという問題があった。
【００１０】
【課題を解決するための手段】
上記の問題を解決するために、この発明は、回転軸線を中心として相対回転可能に連結された一対の回転部材を備え、上記一対の回転部材のいずれか一方に筒部が上記回転軸線と同軸に設けられ、上記一方の回転部材または他方の回転部材に上記筒部に同軸に収容された軸部が設けられ、この軸部の外周面と上記筒部の内周面との間に流体が充填される環状の収容室が形成され、この収容室内には、収容室を二つの室に区画する仕切壁部および弁羽根と、上記弁羽根を間にした両端部に一対の弁部を有し、上記弁羽根に対して上記収容室の周方向へ相対移動可能である弁部材とが配置され、一方の弁部が上記弁羽根に突き当たったときには上記二つの室の一方から他方への流体の流入を抵抗なく許容し、他方の弁部が上記弁羽根に突き当たったときには他方の室から一方の室への流体の流入を抵抗をもって許容する回転ダンパにおいて、上記筒部が形成された一方の回転部材が回転したときに上記仕切壁部が上記筒部に対して相対回転するよう、上記仕切壁部を上記他方の回転部材に一体的に設け、上記弁羽根と上記弁部材とのいずれか一方を、上記一方の回転部材に一体的に設け、他方を一方および上記一方の回転体に対して上記収容室の周方向へ相対変位可能にしたことを特徴としている。
この場合、上記弁羽根を上記一方の回転部材に一体的に設け、上記弁部材を上記弁羽根および上記一方の回転部材に対して上記収容室の周方向へ相対変位可能にするのが望ましい。
また、上記弁部材を上記一方の回転部材に一体的に設け、上記弁羽根を上記弁部材および上記一方の回転部材に対して上記収容室の周方向へ相対変位可能にするのが望ましい。
【００１１】
【発明の実施の形態】
以下、この発明の実施の形態について図１〜図４を参照して説明する。なお、以下の実施の形態においては、上記従来例と異なる構成についてのみ説明し、従来例と同様な部分には同一符号を付してその説明を省略する。
図１はこの発明に係る回転ダンパの一実施の形態を示すものである。この回転ダンパにおいては、図５および図６に示す従来の回転ダンパとは逆に、仕切壁部５が回転部材２に設けられ、弁羽根６が回転部材１に設けられている。
【００１２】
すなわち、回転部材２の軸部２２の外周面には、仕切壁部５が一体に形成されている。この仕切壁部５は、軸部２２から径方向外側へ突出しており、その先端部は筒部１２の内周面に摺動自在に接触している。仕切壁部５の先端部は、第１の室３Ａと第２の室３Ｂとの間が弁羽根６および弁部材７によって遮断されたときに、第１の室３Ａ内の粘性流体（粘性体）を第２の室３Ｂに抵抗をもって流入させるために、筒部１２の内周面に対して僅かに離されることもある。同様の理由により、仕切壁部５には、第１の室３Ａと第２の室３Ｂとの間を連通させるオリフィスが形成されることもある。
【００１３】
回転部材１の筒部１２の底面１２ａ（図５参照）には、弁羽根６が一体に形成されている。弁羽根６は、回転軸線Ｌと平行に収容室３の一端から他端まで延びている。収容室３の径方向内側における弁羽根６の側面は、軸部２２の外周面に摺動自在に接触している。弁羽根６と軸部２２との間には、仕切壁部５と筒部１２の内周面との間の隙間、あるいは仕切壁部５に形成されるオリフィスに代わる隙間を形成してもよい。
【００１４】
弁羽根６には、第１の室３Ａに臨む側面から第２の室３Ｂに臨む側面まで貫通する貫通孔６２が形成されている。この貫通孔６２は、上記従来の弁羽根の切欠き部に対応するものであり、軸部２２が図１の反時計方向へ相対回転し、弁部材７の弁部７１が弁羽根６に突き当たると弁部７１によって閉じられる。この結果、第１の室３Ａと第２の室３Ｂとの間が弁羽根６と弁部材７とによって遮断され、第１の室３Ａから第２の室３Ｂへ流れる粘性流体の流通抵抗が増大する。したがって、回転部材１，２の相対回転が低速に抑えられる。一方、軸部２２が図１の時計方向へ相対回転し、弁部材７の弁部７２が弁羽根６に突き当たったときには、貫通孔６２が弁部７２に形成された貫通孔７２ａを介して第２の室３Ｂに連通する。したがって、第２の室３Ｂ内の粘性流体はほとんど抵抗なく第１の室３Ａに流入することができ、回転部材１，２は高速で相対回転することができる。
【００１５】
上記構成の回転ダンパにおいて筒部１２と軸部２２とが相対回転した場合、回転当初は弁部材７が筒部１２に対して摺動する。しかし、そのときの弁部材７の移動距離は、弁部７１または７２が弁羽根６に突き当たるまでの短い距離である。しかも、このときには第１，第２の室３Ａ，３Ｂ内の粘性流体の圧力が低圧である。したがって、弁部材７は、筒部１２の内周面を摺動することによって早期に摩耗することがない。
【００１６】
弁部７１が弁羽根６に突き当たった後は、貫通孔６２が弁部７１によって閉じられる。このため、第１の室３Ａ内の粘性流体の圧力が高圧になり、弁部材７が筒部１２の内周面に押圧接触させられる。しかし、弁羽根６が第１の回転部材１に形成されているので、弁部７１が弁羽根６に突き当たった後は弁部材７が筒部１２と一体に挙動し、筒部１２に対して摺動することがない。したがって、弁部材７が早期に摩耗するのを確実に防止することができる。
【００１７】
図２はこの発明に係る回転ダンパの第２の実施の形態を示すものであり、この回転ダンパにおいては、弁部材７が筒部１２の内周面に一体に形成されている。弁部材７の弁部７１，７２の内側（収容室３の内周側）の端部どうしは、連結部７３によって連結されており、弁部７１，７２および連結部７３は軸部２２の外周面に摺動自在に接触している。弁部材７と軸部２２との間には、仕切壁部５に形成されるオリフィス等に代わる隙間を形成してもよい。弁部材７の内部には、筒部１２の内周面、弁部７１，７２および連結部７３によって区画される弁室７４が回転軸線Ｌに沿って形成されている。この弁室７４は、弁部７１に形成された貫通孔７１ａを介して第１の室３Ａに連通するとともに、弁部７２に形成された貫通孔７２ａを介して第２の室３Ｂに連通している。
【００１８】
弁室７４の内部には、弁羽根６が配置されている。弁羽根６の基端部、つまり収容室３の内周側における弁羽根６の端部は、弁部材７の連結部７３に回動可能に連結されている。したがって、軸部２２が図２の反時計方向へ相対回転して、第１の室３Ａ内の粘性流体が弁室７４に流入すると、弁羽根６が弁部７２側へ回動させられる。そして、弁羽根６が弁部７２に突き当たると、弁羽根６の貫通孔６２と弁部７２の貫通孔７２ａとが連通する。したがって、第１の室３Ａ内の粘性流体は、貫通孔７１ａ、弁室７４、および貫通孔６２，７２ａを介して第２の室３Ｂに抵抗なく流入する。よって、回転部材１，２は高速で相対回転することができる。一方、軸部２２が図２の時計方向へ相対回転した場合には、第２の室３Ｂ内の粘性流体が弁室７４に流入し、弁羽根材６が弁部７１側に回動させられてこれに突き当たる。すると、貫通孔６２と貫通孔７１ａとが筒部１２の径方向にずれているため、それらが連通することがなく、貫通孔６２が弁部７１によって遮断される。したがって、第２の室３Ｂ〜第１の室３Ａに流入する粘性流体の流通抵抗が増大する。よって、回転部材１，２の相対回転速度が低速に抑えられる。なお、その他の構成は、図１に示す回転ダンパと同様である。
【００１９】
この実施の形態の回転ダンパにおいては、弁部材７が筒部１２に一体に形成されているので、筒部１２に対して摺動することがない。その代わり、弁部材７は軸部２２に対して摺動する。しかし、弁部材７は、筒部１２に形成されているので、第１、第２の室３Ａ，３Ｂのいずれの室が高圧になっても、その圧力によって軸部２２に押圧接触させられることがない。したがって、弁部材７の早期摩耗を確実に防止することができる。
【００２０】
図３および図４は、この発明の第３の実施の形態を示す図である。この実施の形態の回転ダンパにおいては、回転部材２に軸部が設けられておらず、筒部１２を有する回転部材１に軸部１３が一体に設けられている。この軸部１３の外周面には、弁部材７が一体に形成されている。弁部材７の（弁部７１，７２の）先端部は、筒部１２の内周面から離れており、それらの間には、粘性流体をほとんど抵抗なく通することができる大きさの隙間が形成されている。しかし、弁部７１，７２の先端部は、筒部１２に摺動自在に接触させてもよく、あるいは筒部１２にに一体に形成してもよい。その場合には、図２に示す実施の形態の貫通孔７１ａと同様の貫通孔を弁部７１に形成する。
【００２１】
回転部材２の収容室３に臨む端面には、仕切壁部５が一体に設けられている。この仕切壁部５は、筒部１２の内周面および軸部１３の外周面に摺動自在に接触している。仕切壁部５は、筒部１２の内周面および軸部１３の外周面との間に粘性流体を大きな流通抵抗をもって流すことができる隙間を形成してもよい。勿論、仕切壁部５にオリフィスを形成してもよい。
【００２２】
弁部材７の弁部７１，７２間には、弁羽根６が筒部１２の周方向へ移動可能に配置されている。この弁羽根６は、回転部材１，２に対して別体に形成されており、筒部１２の内周面と軸部１３の外周面との少なくとも一方に摺動自在に接触している。
【００２３】
この実施の形態の回転ダンパにおいて、回転部材２（仕切壁部５）が図４の反時計方向へ相対回転すると、弁羽根６が粘性流体によって弁部７２に突き当てられる。しかしこのときには、貫通孔６２，７２ａが連通するので、第１の室３Ａ内の粘性流体はほとんど抵抗なく第２の室３Ｂに流入する。したがって、回転部材１，２は高速で相対回転することができる。一方、仕切壁部５が時計方向へ回転する場合には、弁羽根６が弁部７１に突き当たり、その貫通孔６２が弁部７１によって遮断される。したがって、第２の室３Ｂから第１の室３Ａに流れる粘性流体の流通抵抗が増大する。よって、回転部材１，２の相対回転速度が低速に抑えられる。
【００２４】
また、この回転ダンパにおいては、回転部材１，２が相対回転した場合、弁部材７は筒部１２および軸部１３に対して停止状態を維持する。したがって、弁部材７が早期に摩耗することはない。一方、仕切壁部５および弁羽根６は、回転部材１，２が相対回転すると、筒部１２および軸部１３に対して相対回転する。しかし、仕切壁部５および弁羽根６も早期に摩耗することがない。
【００２５】
すなわち、仕切壁部５は、回転部材２に一体に設けられているので、仮に第１の室３Ａまたは第２の室３Ｂ内の圧力が高圧になったとしても、筒部１２の内周面または軸部１３の外周面に押圧接触させられることがない。したがって、仕切壁部５が早期に摩耗することはない。また、弁羽根６は、弁部７１，７２間の僅かの距離を移動するだけであり、弁部７１または７２に突き当たった後は、筒部１２および軸部１３に対して停止状態になる。したがって、弁羽根６が早期に摩耗することもない。
【００２６】
なお、この発明は上記の実施の形態に限定されるものでなく、適宜変更可能である。
例えば、図１に示す実施の形態においては、仕切壁部５を軸部２２に一体に形成しているが、仕切壁部５を軸部２２と別体に形成し、ボルト等の固定手段によって軸部２２に固定してもよい。これは、弁羽根６および弁部材７についても同様である。
【００２７】
【発明の効果】
以上説明したように、この発明によれば、弁部材が早期に摩耗するのを防止することができるという効果が得られる。
【図面の簡単な説明】
【図１】この発明の第１の実施の形態を示す図４と同様の断面図である。
【図２】この発明の第２の実施の形態を示す図４と同様の断面図である。
【図３】この発明の第３の実施の形態を示す図４のＹ−Ｙ線に沿う断面図である。
【図４】図３のＸ−Ｘ線に沿う拡大断面図である。
【図５】従来の回転ダンパの一例を示す図６のＹ−Ｙ線に沿う断面図である。
【図６】図５のＸ−Ｘ線に沿う拡大断面図である。
【符号の説明】
Ｌ回転軸線
１回転部材
２回転部材
３収容室
３Ａ第１の室
３Ｂ第２の室
５仕切壁部
６弁羽根
７弁部材
１２筒部
１３軸部
２２軸部
７１弁部
７２弁部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary damper that is provided, for example, between a toilet bowl body and a valve lid, and that allows high-speed rotation when the valve lid is opened and rotated, and keeps the rotation speed low when the valve lid is rotated.
[0002]
[Prior art]
An example of a conventional rotary damper of this type is described in Utility Model Registration No. 2502042. As shown in FIGS. 5 and 6, the rotary damper includes a pair of rotating members 1 and 2 that are coupled to be rotatable about a rotation axis L. Connecting portions 11 and 21 are formed at ends of the rotating members 1 and 2 on the side away from each other. One connecting portion 11 is connected to, for example, a toilet body (not shown), and the other connecting portion 21 is connected to a valve lid (not shown). Of course, the connection relationship may be reversed.
[0003]
Further, the rotating members 1 and 2 are provided with a cylindrical portion 12 and a shaft portion 22 each having an axis line coincident with the rotation axis L. An annular storage chamber 3 is formed between the inner peripheral surface of the cylindrical portion 12 and the outer peripheral surface of the shaft portion 22. The accommodation chamber 3 contains a fluid. Usually, a viscous fluid is used as the fluid. A partition wall portion 5, valve blades 6, and a valve member 7 are disposed in the storage chamber 3.
[0004]
The partition wall portion 5 is formed integrally with the tube portion 12 and protrudes radially inward from the inner peripheral surface of the tube portion 12. The distal end portion of the partition wall portion 5 is slidably in contact with the outer peripheral surface of the shaft portion 22.
[0005]
The valve blade 6 is formed integrally with the shaft portion 22 and protrudes radially outward from the outer peripheral surface of the shaft portion 22. A notch 61 is formed at the tip of the valve blade 6. The valve blade 6 and the partition wall portion 5 are separated from each other in the circumferential direction of the storage chamber 3, and the storage chamber 3 is divided into two chambers, the first and second chambers 3A and 3B.
[0006]
The valve member 7 is disposed between the valve blade 6 and the inner peripheral surface of the cylindrical portion 12, and slidably contacts the inner peripheral surface of the cylindrical portion 12. A pair of valve portions 71 and 72 projecting toward the shaft portion 22 are formed at both ends of the valve member 7 in the circumferential direction of the storage chamber 3. One valve portion is formed with a notch 72a.
[0007]
In the rotary damper having the above configuration, when the rotary member 1 (cylinder portion 12) rotates relative to the rotary member 2 in the counterclockwise direction in FIG. 6, the viscous fluid in the first chamber 3A is pushed by the partition wall portion 5. Flow toward the second chamber 3B. Then, the valve member 7 is pushed by the viscous fluid and moves in the same direction. When the valve portion 71 of the valve member 7 hits the valve blade 6, the notch portion 61 of the valve blade 6 is shielded by the valve portion 71. As a result, the flow resistance of the viscous fluid flowing from the first chamber 3A to the second chamber 3B is increased, and the relative rotation of the rotating members 1 and 2 is suppressed to a low speed. The viscous fluid in the first chamber 3A is a slight gap between the contact surfaces of the valve portion 71 and the valve blade 6, a slight gap between the partition wall portion 5 and the shaft portion 12, or the partition wall portion. 5 flows through the orifice (not shown) formed in the second chamber 3B.
[0008]
On the other hand, when the rotating member 1 rotates in the clockwise direction, the viscous fluid in the second chamber 3B flows toward the first chamber 3A. The valve member 7 is pushed by the viscous fluid and moves in the same direction, and the valve portion 72 hits the valve blade 6. However, at this time, the notch 61 of the valve blade 6 and the notch 72a of the valve member 7 are opposed to and communicate with each other. Therefore, the viscous fluid flows almost without resistance. Therefore, the rotating members 1 and 2 can freely rotate.
[0009]
[Problems to be solved by the invention]
The valve member 7 rotates together with the rotating member 1 at the beginning of the rotation of the rotating members 1 and 2. However, after the valve portion 71 or 72 hits the valve blade 6 and stops, it rotates relative to the rotating member 1. For this reason, it is abraded by the inner peripheral surface of the cylinder part 12. In particular, when the rotating member 1 rotates counterclockwise, the flow of the viscous fluid from the first chamber 3A to the second chamber 3B is inhibited, so that the pressure of the viscous fluid in the first chamber 3A is reduced. Become high pressure. The valve member 7 is pressed against the inner peripheral surface of the cylindrical portion 12 by this high pressure. For this reason, there was a problem that the valve member 7 was worn out early.
[0010]
[Means for Solving the Problems]
In order to solve the above problem, the present invention includes a pair of rotating members coupled so as to be relatively rotatable about a rotation axis, and a cylindrical portion is coaxial with the rotation axis on one of the pair of rotation members. The one rotating member or the other rotating member is provided with a shaft portion that is coaxially accommodated in the cylindrical portion, and a fluid flows between the outer peripheral surface of the shaft portion and the inner peripheral surface of the cylindrical portion. An annular storage chamber is formed. The storage chamber has a partition wall and valve blades that divide the storage chamber into two chambers, and a pair of valve portions at both ends of the valve blade. And a valve member that is movable relative to the valve blade in the circumferential direction of the storage chamber, and when one valve portion hits the valve blade, fluid from one of the two chambers to the other Inflow without resistance, and the other valve part hits the valve blade. Sometimes, in a rotary damper that allows the inflow of fluid from the other chamber to the one chamber with resistance, when the one rotating member formed with the cylindrical portion rotates, the partition wall portion is relatively opposed to the cylindrical portion. The partition wall is provided integrally with the other rotating member so as to rotate, and either one of the valve blade and the valve member is provided integrally with the one rotating member, and the other is provided with one and the other. It is characterized in that it can be displaced relative to one rotating body in the circumferential direction of the housing chamber.
In this case, it is desirable that the valve blade is provided integrally with the one rotating member so that the valve member can be displaced relative to the valve blade and the one rotating member in the circumferential direction of the storage chamber.
Preferably, the valve member is integrally provided on the one rotating member, and the valve blade is relatively displaceable in the circumferential direction of the storage chamber with respect to the valve member and the one rotating member.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. In the following embodiments, only the configuration different from the conventional example will be described, and the same parts as those in the conventional example will be denoted by the same reference numerals and the description thereof will be omitted.
FIG. 1 shows an embodiment of a rotary damper according to the present invention. In this rotary damper, contrary to the conventional rotary damper shown in FIGS. 5 and 6, the partition wall portion 5 is provided on the rotary member 2, and the valve blade 6 is provided on the rotary member 1.
[0012]
That is, the partition wall portion 5 is integrally formed on the outer peripheral surface of the shaft portion 22 of the rotating member 2. The partition wall portion 5 protrudes radially outward from the shaft portion 22, and a tip portion thereof is slidably in contact with the inner peripheral surface of the cylindrical portion 12. When the space between the first chamber 3A and the second chamber 3B is blocked by the valve blade 6 and the valve member 7, the leading end of the partition wall 5 is a viscous fluid (viscous material in the first chamber 3A). ) May be slightly separated from the inner peripheral surface of the cylindrical portion 12 in order to flow into the second chamber 3B with resistance. For the same reason, the partition wall 5 may be formed with an orifice that allows communication between the first chamber 3A and the second chamber 3B.
[0013]
A valve blade 6 is integrally formed on the bottom surface 12 a (see FIG. 5) of the cylindrical portion 12 of the rotating member 1. The valve blade 6 extends from one end of the storage chamber 3 to the other end in parallel with the rotation axis L. The side surface of the valve blade 6 on the radially inner side of the storage chamber 3 is in slidable contact with the outer peripheral surface of the shaft portion 22. Between the valve blade 6 and the shaft part 22, a gap between the partition wall part 5 and the inner peripheral surface of the cylinder part 12 or a gap in place of the orifice formed in the partition wall part 5 may be formed. .
[0014]
The valve blade 6 is formed with a through hole 62 penetrating from a side surface facing the first chamber 3A to a side surface facing the second chamber 3B. This through hole 62 corresponds to the notch of the conventional valve blade, the shaft portion 22 rotates relative to the counterclockwise direction in FIG. 1, and the valve portion 71 of the valve member 7 abuts against the valve blade 6. And the valve portion 71 is closed. As a result, the space between the first chamber 3A and the second chamber 3B is blocked by the valve blade 6 and the valve member 7, and the flow resistance of the viscous fluid flowing from the first chamber 3A to the second chamber 3B is increased. To do. Therefore, the relative rotation of the rotating members 1 and 2 is suppressed to a low speed. On the other hand, when the shaft portion 22 rotates relative to the clockwise direction in FIG. 1 and the valve portion 72 of the valve member 7 hits the valve blade 6, the through-hole 62 passes through the through-hole 72 a formed in the valve portion 72. Communicates with the second chamber 3B. Therefore, the viscous fluid in the second chamber 3B can flow into the first chamber 3A with almost no resistance, and the rotating members 1 and 2 can relatively rotate at high speed.
[0015]
When the cylindrical portion 12 and the shaft portion 22 rotate relative to each other in the rotary damper having the above configuration, the valve member 7 slides relative to the cylindrical portion 12 at the beginning of rotation. However, the moving distance of the valve member 7 at that time is a short distance until the valve portion 71 or 72 hits the valve blade 6. In addition, at this time, the pressure of the viscous fluid in the first and second chambers 3A and 3B is low. Therefore, the valve member 7 does not wear at an early stage by sliding on the inner peripheral surface of the cylindrical portion 12.
[0016]
After the valve portion 71 hits the valve blade 6, the through hole 62 is closed by the valve portion 71. For this reason, the pressure of the viscous fluid in the first chamber 3 </ b> A becomes high, and the valve member 7 is pressed into contact with the inner peripheral surface of the cylindrical portion 12. However, since the valve blade 6 is formed on the first rotating member 1, the valve member 7 behaves integrally with the cylinder portion 12 after the valve portion 71 hits the valve blade 6, and There is no sliding. Therefore, it is possible to reliably prevent the valve member 7 from being worn out early.
[0017]
FIG. 2 shows a second embodiment of the rotary damper according to the present invention. In this rotary damper, the valve member 7 is formed integrally with the inner peripheral surface of the cylindrical portion 12. End portions on the inner side (inner peripheral side of the storage chamber 3) of the valve portions 71 and 72 of the valve member 7 are connected by a connecting portion 73, and the valve portions 71 and 72 and the connecting portion 73 are connected to the outer periphery of the shaft portion 22. It is in sliding contact with the surface. A gap instead of an orifice or the like formed in the partition wall portion 5 may be formed between the valve member 7 and the shaft portion 22. Inside the valve member 7, a valve chamber 74 defined by the inner peripheral surface of the cylindrical portion 12, the valve portions 71 and 72, and the connecting portion 73 is formed along the rotation axis L. The valve chamber 74 communicates with the first chamber 3A via a through hole 71a formed in the valve portion 71 and communicates with the second chamber 3B via a through hole 72a formed in the valve portion 72. ing.
[0018]
Inside the valve chamber 74, the valve blade 6 is disposed. The base end portion of the valve blade 6, that is, the end portion of the valve blade 6 on the inner peripheral side of the housing chamber 3 is rotatably connected to the connecting portion 73 of the valve member 7. Therefore, when the shaft portion 22 rotates relatively counterclockwise in FIG. 2 and the viscous fluid in the first chamber 3A flows into the valve chamber 74, the valve blade 6 is rotated toward the valve portion 72. When the valve blade 6 hits the valve portion 72, the through hole 62 of the valve blade 6 and the through hole 72 a of the valve portion 72 communicate with each other. Therefore, the viscous fluid in the first chamber 3A flows into the second chamber 3B without resistance through the through hole 71a, the valve chamber 74, and the through holes 62 and 72a. Therefore, the rotating members 1 and 2 can relatively rotate at high speed. On the other hand, when the shaft portion 22 rotates relative to the clockwise direction in FIG. 2, the viscous fluid in the second chamber 3B flows into the valve chamber 74, and the valve blade member 6 is rotated toward the valve portion 71. I hit this. Then, since the through hole 62 and the through hole 71 a are displaced in the radial direction of the cylindrical portion 12, they do not communicate with each other, and the through hole 62 is blocked by the valve portion 71. Therefore, the flow resistance of the viscous fluid flowing into the second chamber 3B to the first chamber 3A increases. Therefore, the relative rotational speed of the rotating members 1 and 2 is suppressed to a low speed. The other configuration is the same as that of the rotary damper shown in FIG.
[0019]
In the rotary damper of this embodiment, since the valve member 7 is formed integrally with the cylindrical portion 12, it does not slide with respect to the cylindrical portion 12. Instead, the valve member 7 slides with respect to the shaft portion 22. However, since the valve member 7 is formed in the cylindrical portion 12, even if any of the first and second chambers 3A and 3B becomes high pressure, the valve member 7 is pressed against the shaft portion 22 by the pressure. There is no. Therefore, early wear of the valve member 7 can be reliably prevented.
[0020]
3 and 4 are diagrams showing a third embodiment of the present invention. In the rotary damper of this embodiment, the rotating member 2 is not provided with a shaft portion, and the rotating member 1 having the cylindrical portion 12 is provided with the shaft portion 13 integrally. A valve member 7 is integrally formed on the outer peripheral surface of the shaft portion 13. The tip of the valve member 7 (of the valve parts 71 and 72) is away from the inner peripheral surface of the cylindrical part 12, and there is a gap large enough to allow viscous fluid to pass therethrough without any resistance. Is formed. However, the tip portions of the valve portions 71 and 72 may be slidably contacted with the cylindrical portion 12 or may be formed integrally with the cylindrical portion 12. In that case, a through hole similar to the through hole 71a of the embodiment shown in FIG.
[0021]
A partition wall portion 5 is integrally provided on an end surface of the rotating member 2 facing the accommodation chamber 3. The partition wall portion 5 is slidably in contact with the inner peripheral surface of the cylindrical portion 12 and the outer peripheral surface of the shaft portion 13. The partition wall 5 may form a gap between the inner peripheral surface of the cylindrical portion 12 and the outer peripheral surface of the shaft portion 13 so that the viscous fluid can flow with a large flow resistance. Of course, an orifice may be formed in the partition wall 5.
[0022]
Between the valve parts 71 and 72 of the valve member 7, the valve blade 6 is disposed so as to be movable in the circumferential direction of the cylindrical part 12. The valve blade 6 is formed separately from the rotating members 1 and 2 and slidably contacts at least one of the inner peripheral surface of the cylindrical portion 12 and the outer peripheral surface of the shaft portion 13.
[0023]
In the rotary damper of this embodiment, when the rotating member 2 (partition wall 5) is relatively rotated counterclockwise in FIG. 4, the valve blade 6 is abutted against the valve portion 72 by the viscous fluid. However, at this time, since the through holes 62 and 72a communicate with each other, the viscous fluid in the first chamber 3A flows into the second chamber 3B with almost no resistance. Therefore, the rotating members 1 and 2 can relatively rotate at high speed. On the other hand, when the partition wall portion 5 rotates in the clockwise direction, the valve blade 6 hits the valve portion 71 and the through hole 62 is blocked by the valve portion 71. Therefore, the flow resistance of the viscous fluid flowing from the second chamber 3B to the first chamber 3A increases. Therefore, the relative rotational speed of the rotating members 1 and 2 is suppressed to a low speed.
[0024]
Further, in this rotary damper, when the rotary members 1 and 2 rotate relative to each other, the valve member 7 maintains a stopped state with respect to the cylindrical portion 12 and the shaft portion 13. Therefore, the valve member 7 does not wear early. On the other hand, the partition wall portion 5 and the valve blade 6 rotate relative to the cylindrical portion 12 and the shaft portion 13 when the rotating members 1 and 2 rotate relative to each other. However, the partition wall portion 5 and the valve blade 6 are not worn at an early stage.
[0025]
That is, since the partition wall portion 5 is provided integrally with the rotating member 2, even if the pressure in the first chamber 3A or the second chamber 3B becomes high, the inner peripheral surface of the cylindrical portion 12 Alternatively, the outer peripheral surface of the shaft portion 13 is not pressed and contacted. Therefore, the partition wall portion 5 is not worn early. Further, the valve blade 6 moves only a small distance between the valve portions 71 and 72, and after being abutted against the valve portion 71 or 72, the valve blade 6 is stopped with respect to the cylindrical portion 12 and the shaft portion 13. Therefore, the valve blade 6 is not worn out early.
[0026]
In addition, this invention is not limited to said embodiment, It can change suitably.
For example, in the embodiment shown in FIG. 1, the partition wall portion 5 is formed integrally with the shaft portion 22, but the partition wall portion 5 is formed separately from the shaft portion 22 and is fixed by a fixing means such as a bolt. You may fix to the axial part 22. FIG. The same applies to the valve blade 6 and the valve member 7.
[0027]
【The invention's effect】
As described above, according to the present invention, there is an effect that the valve member can be prevented from being worn at an early stage.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view similar to FIG. 4 showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view similar to FIG. 4 showing a second embodiment of the present invention.
FIG. 3 is a sectional view taken along line YY of FIG. 4 showing a third embodiment of the present invention.
4 is an enlarged cross-sectional view taken along line XX in FIG.
5 is a cross-sectional view taken along line YY of FIG. 6 showing an example of a conventional rotary damper.
6 is an enlarged sectional view taken along line XX of FIG.
[Explanation of symbols]
L Rotating axis 1 Rotating member 2 Rotating member 3 Accommodating chamber 3A First chamber 3B Second chamber 5 Partition wall portion 6 Valve blade 7 Valve member 12 Tube portion 13 Shaft portion 22 Shaft portion 71 Valve portion 72 Valve portion

Claims

A pair of rotating members coupled to be rotatable relative to each other about a rotation axis, and a cylindrical portion is provided coaxially with the rotation axis in one of the pair of rotation members, and the one rotation member or the other rotation The member is provided with a shaft portion coaxially accommodated in the cylindrical portion, and an annular storage chamber is formed between the outer peripheral surface of the shaft portion and the inner peripheral surface of the cylindrical portion. The room has a partition wall and valve blades that divide the storage chamber into two chambers, and a pair of valve portions at both ends between the valve blades. And a valve member that is relatively movable in the direction, and when one of the valve portions hits the valve blade, the flow of fluid from one of the two chambers to the other is allowed without resistance, and the other valve portion When it hits the valve blade, the fluid flow from the other chamber to one chamber In the rotary damper which permits entry with a resistor,
The partition wall portion is provided integrally with the other rotation member so that the partition wall portion is in sliding contact with the inner peripheral surface of the cylinder portion when the one rotation member formed with the cylinder portion rotates. One of the blade and the valve member is integrally provided on the one rotating member , and the other is relatively displaceable in the circumferential direction of the housing chamber with respect to the one and the one rotating member . Rotating damper.

The valve blade is provided integrally with the one rotating member, and the valve member is provided so as to be relatively displaceable in the circumferential direction of the storage chamber with respect to the valve blade and the one rotating member. Item 2. The rotary damper according to Item 1.

The valve member is integrally provided on the one rotating member, and the valve blade is relatively displaceable in the circumferential direction of the storage chamber with respect to the valve member and the one rotating member. The rotary damper according to 1.