SHOCK ABSORBER

• Main Authors: HONJO YUTARO, GOMI RYOTA, KOBAYASHI YOSHIFUMI, YOKOYAMA HIRONORI, MIZUNO KAZUYUKI
• Format: Patent
• Language: English; Japanese
• Published: 13.04.2023
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MEANS FOR DAMPING VIBRATION; MECHANICAL ENGINEERING; SHOCK-ABSORBERS; SPRINGS; THERMAL INSULATION IN GENERAL; WEAPONS

To provide a shock absorber reducing torque applied to a rotary valve by fluid force of hydraulic fluid.SOLUTION: A shock absorber includes: a hollow rod 4 having a rod hole 41 opening in a first chamber 21, and an inside fluid passage 42 communicating the rod hole 41 and a second chamber 22 with each other; a hollow rotary valve 5 rotatably disposed inside the hollow rod 4 and having a valve hole 51 communicating the first chamber 21 and the inside fluid passage 42 with each other together with the rod hole 41; and a cylindrical member 7 disposed inside the rotary valve 5 so as not to be movable relative to the hollow rod 4, so as to cover at least part of the inner peripheral surface of the rotary valve 5. The cylindrical member 7 includes a communication hole 71 at a position facing the rod hole 41. The inner peripheral surface of the cylindrical member 7 constitutes at least part of the inside fluid passage 42. The first chamber 21 and the inside fluid passage 42 are communicated with each other by the rod hole 41, the valve hole 51, and the communication hole 71.SELECTED DRAWING: Figure 2 【課題】作動液の流体力により回転バルブに加わるトルクを低減させることができるショックアブソーバを提供する。【解決手段】本発明は、第１室２１に開口したロッド孔４１及びロッド孔４１と第２室２２とを連通させる内部液路４２を有する中空ロッド４と、中空ロッド４の内側に回転可能に配置され、ロッド孔４１とともに第１室２１と内部液路４２とを連通させるバルブ孔５１を有する中空の回転バルブ５と、回転バルブ５の内周面の少なくとも一部を覆うように、回転バルブ５の内側に中空ロッド４に対して相対移動不能に配置された筒状部材７と、を備え、筒状部材７が、ロッド孔４１に対向する位置に連通孔７１を有し、筒状部材７の内周面が、内部液路４２の少なくとも一部を構成し、第１室２１と内部液路４２とが、ロッド孔４１、バルブ孔５１、及び連通孔７１により連通される。【選択図】図２