Shock absorber
AssigneeShowa Corporation
InventorsKazuhiro Miwa, Naoya Kuroiwa
Life of this patent
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Abstract
A shock absorber includes a cylinder in which oil is sealed, a piston slidably fitted into the cylinder, a piston rod connected to the piston and extending to the outside of the cylinder, and a damping force generating apparatus controlling a flow of the oil generated by the sliding of the piston inside the cylinder. The damping force generating apparatus includes a valve body generating a damping force by being opened and closed on a flow path in which the oil flows, a valve seat closing the flow path when the valve body is seated, and an actuator generating thrust to the valve body in a valve closing direction. The valve seat has a first elastic body which is elastically deformable in the valve closing direction of the valve body.
Claims8
A shock absorber comprising:
- a cylinder in which oil is sealed;
- a piston slidably fitted into the cylinder;
- a piston rod connected to the piston and extending to an outside of the cylinder;
- and
- a damping force generating apparatus controlling a flow of the oil generated by a sliding movement of the piston inside the cylinder, wherein
- the damping force generating apparatus comprises;
- a valve body generating damping force by being opened and closed on a flow path in which the oil flows,
- a valve seat closing the flow path when the valve body is seated, and
- an actuator generating thrust to the valve body in a valve closing direction,
- the valve seat comprises a first elastic body which is elastically deformable in the valve closing direction of the valve body and a valve seat portion on which the valve body is seated,
- the flow path comprises;
- a first flow path provided in an upstream side in an oil flow direction with respect to the valve seat portion,
- a second flow path provided in a downstream side in the oil flow direction with respect to the valve seat portion, and
- a valve body back pressure chamber communicated to the second flow path and allowing an oil pressure to act on the valve body in the valve closing direction,
- a first pressure receiving portion which is at least a part of the valve body receives a pressure in a valve opening direction by an oil pressure of the first flow path,
- a second pressure receiving portion which is at least a part of the valve body and which is different from the first pressure receiving portion receives a pressure in the valve closing direction by the oil pressure of the valve body back pressure chamber communicated to the second flow path, and
- a pressure receiving area of the first pressure receiving portion is equal to a pressure receiving area of the second pressure receiving portion.
Dependencies are inferred from the claim text.