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US 2011/0214953 A1Published application
Shock absorber
AssigneeHitachi Automotive Systems, Ltd.
InventorsAtsushi Maeda, Masaru Kouyama, Mikio Yamashita, Fumiyuki Yamaoka
Life of this patent
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Abstract
A shock absorber has an inclined surface that is inclined to a moving direction of the free piston in at least one of a free piston contact surface of a free piston with which an elastic body is in contact and a housing contact surface of a housing with which the elastic body is in contact. A shortest distance between the free piston contact surface and the housing contact surface is changed by movement of the free piston.
Claims20
A shock absorber comprising:
- a cylinder in which a working fluid is enclosed;
- a piston slidably fitted into the cylinder and configured to partition an interior of the cylinder into two chambers;
- a piston rod connected to the piston and configured to extend to an exterior of the cylinder;
- first and second passages to which the working fluid flows out from one of the chambers of the interior of the cylinder by movement of the piston;
- a damping force generation mechanism installed in the first passage and configured to generate a damping force;
- a housing in which a flow passage corresponding to at least a part of the second passage is formed;
- a free piston movably installed in the housing and configured to partition the second passage into an upstream side and a downstream side;
- and
- one or more elastic bodies disposed between the free piston and the housing,
- wherein at least one of a free piston contact surface of the free piston with which the elastic body is in contact and a housing contact surface of the housing with which the elastic body is in contact includes an inclined surface that is inclined to a moving direction of the free piston, and a shortest distance between a portion that is in contact with the elastic body within the free piston contact surface and a portion that is in contact with the elastic body within the housing contact surface is changed by movement of the free piston.
7 more elements
A shock absorber comprising:
- a cylinder in which a working fluid is enclosed;
- a piston slidably fitted into the cylinder and configured to partition an interior of the cylinder into two chambers;
- a piston rod connected to the piston and configured to extend to an exterior of the cylinder;
- first and second passages to which the working fluid flows out from one of the chambers of the interior of the cylinder by movement of the piston;
- a damping force generation mechanism installed in the first passage and configured to generate a damping force;
- a housing in which a flow passage corresponding to at least a part of the second passage is formed;
- a free piston movably installed in the housing and configured to partition the second passage into an upstream side and a downstream side;
- and
- one or more elastic bodies disposed between the free piston and the housing,
- wherein the free piston includes a moving direction deformation region where the elastic body undergoes elastic deformation in a moving direction of the free piston on a downstream side end within a moving region of the free piston, and a moving region where the elastic body moves in the moving direction of the free piston in a state where the elastic body is in contact with both the housing and the free piston at a position separated from the downstream side end.
7 more elements
A shock absorber comprising:
- a cylinder in which a working fluid is enclosed;
- a piston slidably fitted into the cylinder and configured to partition an interior of the cylinder into two chambers;
- a piston rod connected to the piston and configured to extend to an exterior of the cylinder;
- first and second passages to which the working fluid flows out from one of the chambers of the interior of the cylinder by movement of the piston;
- a damping valve installed in the first passage and configured to regulate a flow of the working fluid, which is generated by sliding of the piston, to generate a damping force;
- and
- a free piston installed in the second passage and configured to partition the second passage into an upstream side and a downstream side,
- wherein a passage area varying mechanism that makes a passage area of the second passage adjustable is installed in the second passage.
5 more elements
Dependencies are inferred from the claim text.