Patent ID: 8347623
Filing Date: 2013-01-08
Classification: B60T,F16J

Abstract:
1. A cylinder apparatus comprising: a cylinder body comprising: a cup seal fitted into the seal groove; and a piston slidably inserted into the cylinder bore via the cup seal, wherein the seal groove comprises: an abutment portion is provided on a base end surface of the base portion of the cup seal, the abutment portion is protruded from the base end surface of the base portion of the cup seal toward the cylinder bore opening portion so that a protruded end thereof abuts with the opening-side-surface of the seal groove, a contact pressure adjustment portion is provided on the base end surface of the base portion of the cup seal at a position closer to an inner circumference than the abutment portion, the contact pressure adjustment portion does not contact with an inner circumferential side of the opening-side-surface in a state where the cylinder apparatus is in a non-operational state; and the contact pressure adjustment portion contacts with the inner circumferential side of the opening-side-surface in a state where the cylinder apparatus is in an operational state.