Patent ID: 6840357

Claim:
A hydraulic damping device comprising: a cylinder disposed coaxially in an outer shell; a sealing case closing the open ends of the outer shell and the cylinder; a piston disposed to slide freely in the cylinder; a piston rod connected to the piston through the sealing case; two oil chambers partitioned by the piston in the cylinder; a reservoir provided between the cylinder and the outer shell; a damping valve provided in the piston and opening and closing a passage between the two oil chambers; a base valve interposed in a passage connecting the reservoir and the oil chamber in which the piston rod is not included; two parallel passages connecting the oil chamber in which the piston rod is included and the reservoir, the passages provided in the sealing case; a needle valve disposed in the sealing case and regulating the area of the opening of the one oil passage; and a poppet valve disposed in the sealing case and biased in a direction in which the other oil passage is closed by the spring and an adjuster regulating the biasing force of the spring of the poppet valve.