Damping force control type hydraulic shock absorber

• Main Authors: MATSUMOTO TAKUYA, NEZU TAKASHI
• Format: Patent
• Language: English
• Published: 02.08.2001
• Edition: 7
• 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

A damping force control type hydraulic shock absorber capable of generating stable damping force even if the flow rate of hydraulic fluid changes sharply. A slider is slidably fitted in a piston bolt. Valve members are secured to both ends of the slider to form extension and compression pressure control valves for controlling the pressure of hydraulic fluid between upstream and downstream ports provided in the piston bolt. Hydraulic fluid chambers at the respective ends of the valve members are cut off from the downstream ports of the extension and compression pressure control valves by flange portions of the valve members. When the flow rate of hydraulic fluid increases sharply, even if the pressure in the downstream ports changes sharply owing to the flow resistance in check valves on the downstream side of the downstream ports, the pressure is not transmitted to the hydraulic fluid chambers. Therefore, there is no possibility of the slider moving under the influence of such a pressure change. Accordingly, stable damping force can be obtained.