HYDRAULIC DAMPER

• Main Authors: YAMADA NOBUHIRO, OKADA YUICHI
• Format: Patent
• Language: English; Japanese
• Published: 13.03.2023
• 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 hydraulic damper for reducing man-hours for development when setting damping force.SOLUTION: The hydraulic damper includes a piston 20 to be slidably displaced in a cylinder tube 18, a piston rod 12 to be displaced integrally with the piston 20, a piston port part 34 for communicating a first chamber 30 and a second chamber 32 parted by the piston, with each other, a first leaf valve 50 and a second leaf valve 56 arranged downstream of the piston port part 34 where pressure oil is distributed, and a sub valve 60 arranged upstream of the first leaf valve 50 and downstream of the second leaf valve 56, the sub valve 60 being provided with a sub valve port part 76 which is communicated with a flow path of the piston port part 34. A total sum (S2) of the flow path cross section area of the sub valve port part 76 is smaller than a total sum (S1) of the flow path cross section area of the piston port part 34 (S1>S2).SELECTED DRAWING: Figure 2 【課題】減衰力を設定する際の開発工数を削減すること。【解決手段】シリンダチューブ１８内を摺動変位するピストン２０と、該ピストン２０と一体的に変位するピストンロッド１２と、ピストンによって区画される第１室３０と第２室３２とを連通させるピストンポート部３４と、圧油が流通するピストンポート部３４の下流に配置された第１リーフバルブ５０及び第２リーフバルブ５６と、第１リーフバルブ５０の上流で、且つ、第２リーフバルブ５６の下流に配置されたサブバルブ６０とを備え、サブバルブ６０には、ピストンポート部３４の流路と連通するサブバルブポート部７６が設けられ、サブバルブポート部７６の流路断面積の総和（Ｓ２）は、ピストンポート部３４の流路断面積の総和（Ｓ１）よりも小さい（Ｓ１＞Ｓ２）。【選択図】図２