Hydraulic damper
AssigneeAtsugi Unisia Corporation
InventorsMichiya Nakamura, Kimihisa Kasajima, Hiroshi Hoya
Life of this patent
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Abstract
A hydraulic damper is disclosed which has a contraction phase one-way passage way which allows a flow of damping fluid in contraction phase, an extension phase one-way passage way which allows a flow of damping fluid in extension phase, and a valve element in the form of a hollow control rod. The valve element has a neutral position in which both of the contraction phase and extension phase one-way passage ways are open, a first displaced position in which the extension phase one-way passage way is restricted with the contraction phase one-way passage way left open, and a second displaced position in which the contraction phase one-way passage way is restricted with said extension phase one-way passage way left open.
Claims12
A hydraulic damper, comprising:
- a cylinder;
- a hollow rod;
- a piston secured on said hollow rod dividing said cylinder into first and second chambers containing damping fluid;
- an extension phase damping valve for damping in the extension phase;
- a contraction phase damping valve for damping in the contraction phase;
- a contraction phase one-way passage way via which said second chamber is connectable with said first chamber in the contraction phase;
- an extension phase one-way passage way via which the first chamber is connectable with the second chamber in the extension phase;
- and
- a valve element rotatably disposed in said hollow rod and having a neutral position in which both of said contraction phase and extension phase one-way passage ways are open, said valve element being angularly displaceable in a first rotational direction from said neutral position to a first displaced position in which said extension phase one-way passage way is closed with said contraction phase one-way passage way left open, said valve element being angularly displaceable in a second rotational direction, opposite to said first rotational direction, to a second displaced position in which said contraction phase one-way passage way is closed with said extension phase one-way passage way left open;
- wherein said valve element is in the form of a hollow control rod rotatably mounted within the interior of said hollow rod, said hollow control rod having an axial end formed with a diametrical land received in a key opening of a positioning plate fixedly secured on said hollow rod, the diametrical land and key opening cooperating with each other to limit motion of said hollow control rod within a predetermined range.
A hydraulic damper comprising:
- a cylinder;
- a hollow rod with a cylindrical interior;
- a piston secured on said hollow rod dividing said cylinder into first and second chambers containing damping fluid;
- an extension phase damping valve for damping in the extension phase;
- a contraction phase damping valve for damping in the contraction phase;
- a contraction phase one-way passage way via which said second chamber is connectable with said first chamber in the contraction phase;
- an extension phase one-way passage way via which said first chamber is connectable with said second chamber in the extension phase;
- and
- a valve element in the form of a hollow control rod rotatably disposed in said hollow rod,
- said valve element having a central bore having one end communicating with said second chamber, said central bore forming a part of said contraction phase one-way passage way,
- said valve element being formed with at least one groove, each groove cooperating with said cylindrical interior of said hollow rod to form a transfer passage which forms a part of said extension phase one-way passage way,
- said valve element having a neutral position in which both of said contraction phase and extension phase one-way passage ways are open,
- said valve element being angularly displaceable in a first rotational direction from said neutral position to a first displaced position in which said extension phase one-way passage way is closed with said contraction phase one-way passage way left open,
- said valve element being angularly displaceable in a second rotational direction, opposite to said first rotational direction, to a second displaced position in which said contraction phase one-way passage way is closed with said extension phase one-way passage way left open.
Dependencies are inferred from the claim text.