| 摘要 |
PURPOSE:To eliminate delay of braking force at the compression side without encapsulating pressurized gas by making such that a second compression pressure control valve for maintaining the hydraulic pressure in a lower oil chamber at specific level will open with higher pressure than that for first compression main pressure control valve to allow only upward passing of oil. CONSTITUTION:A piston 6 is provided with an extending pressure control valve 12 for going down of oil which will determine the pressure in upper oil chamber 7 under extension stroke, first compression main pressure control valve 13 for going up of oil which will determine the pressure in lower oil chamber 8 under compression stroke and an orifice 14 communicating with both chambers 7, 8. A bottom cover 18 having a suction valve 15 communicating with an oil storage chamber 4 and second compression pressure control valve 16 to be pressurized by a valve spring 17 for maintaining the pressure in said chamber 8 higher than predetermined level while opened by pressure higher than that for said valve 13 is provided at the lower section of inner tube 3. Consequently, delay of braking force at the compression side of conventional pressureless oil damper can be eliminated. |
