Patent ID: 7793584

Claim:
A hydraulic damper comprising: a cylinder; an outer cylinder disposed outside the cylinder; an oil chamber formed inside the cylinder; a reservoir formed between the cylinder and the outer cylinder; a rod guide for closing opening ends of the cylinder and the outer cylinder; an insert metal disposed in a layer on the rod guide; a rod penetrating freely and slidably through the rod guide and the insert metal; a receiving space formed between the rod guide and the insert metal, for temporarily retaining a working fluid leaked out from the oil chamber through a sliding clearance between the rod guide and the rod; a communicating path for communicating the reservoir and the receiving space; and a check valve disposed between the receiving space and the communicating path, for allowing a flow of the working fluid only from the receiving space to the reservoir; wherein a lip part of the check valve is formed with an annular projection as a sealing projected part which protrudes from a contact surface toward a seat surface for the check valve provided on the rod guide; and wherein a circular stepped part of a certain height but lower than the projection is further formed on the seat surface at a position further to an inner periphery side from the annular projection provided on the lip part.