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US 5,115,892 AGranted
Hydraulic shock absorber with piston seal structure for enhancement of initial response
AssigneeAtsugi Unisia Corporation
InventorsFumiyuki Yamaoka, Junichi Emura, Takayuki Furuya
Life of this patent
Estimating the term…
Abstract
A shock absorber employs a seal structure which can sucessfully prevent a working fluid from causing leak flow for enhanced variation characteristics of damping force. The seal structure includes a seamless seal member applied on a piston and/or on an inner periphery of a piston rod guide member.
Claims12
A shock absorber comprising:
- a hollow cylinder filled with a working fluid;
- a piston mounted on one end of a piston rod and thrustingly movable within the hollow cylinder, said piston dividing the interior space of said cylinder into first and second chambers;
- a fluid path means for establishing fluid communication between said first and second fluid chambers, said fluid path means generating a first damping force in response to piston stroke;
- a first flow restricting valve means associated with said fluid path means for restricting fluid flow therethrough for generating a second damping force in response to piston stroke in one direction;
- a second flow restricting value means associated with said fluid path means and arranged in series with said first valve means, for restricting fluid flow therethrough for generating a third damping force in response to piston stroke in said one direction, said flow path means and said first and second valve means being formed so that a composite damping force of said first, second and third damping forces has an essentially linear variation characteristic in relation to piston stroke speed;
- and
- a seal member disposed between the outer periphery of said piston and the inner periphery of said cylinder for establishing fluid tight sealing therebetween, said seal member assuring the essentially linear variation characteristic of said composite damping force.
4 more elements
A shock absorber comprising:
- a hollow cylinder filled with a working fluid;
- a piston mounted on one end of a piston rod and thrustingly movable within the hollow cylinder, said piston dividing the interior space of said cylinder into first and second chambers;
- a fluid path means for establishing fluid communication between said first and second fluid chambers, said fluid path means generating a first damping force in response to piston stroke;
- a first flow restricting valve means associated with said fluid path means for restricting fluid flow therethrough for generating a second damping force in response to piston stroke in one direction;
- a second flow restricting valve means associated with said fluid path means and arranged in series with said first valve means, for restricting fluid flow therethrough for generating a third damping force in response to piston stroke in said one direction, said flow path means and said first and second valve means being formed so that a composite damping force of said first, second and third damping forces has an essentially linear variation characteristic in relation to piston stroke speed;
- a closure member closing one end of said cylinder and defining therethrough a through opening, through which said piston rod extends for external connection;
- and
- a seal ring disposed between the outer periphery of said piston rod and the inner periphery of said through opening of said closure member for establishing fluid tight sealing therebetween, said seal ring assuring the essentially linear variation characteristic of said composite damping force.
5 more elements
A shock absorber comprising:
- a hollow cylinder filled with a working fluid;
- a piston mounted on one end of a piston rod and thrustingly movable within the hollow cylinder, said piston dividing the interior space of said cylinder into first and second chambers;
- a fluid path means for establishing fluid communication between said first and second fluid chambers;
- a flow restricting valve means associated with said fluid path means for restricting fluid flow therethrough for generating a damping force which has an essentially linear variation characteristic in relation to piston stroke;
- and
- a seal member disposed between the outer periphery of said piston and the inner periphery of said cylinder for establishing fluid tight sealing therebetween, said seal member assuring the essentially linear variation characteristic of said damping force.
3 more elements
A shock absorber comprising:
- a hollow cylinder filled with a working fluid;
- a piston mounted on one end of a piston rod and thrustingly movable within the hollow cylinder, said piston dividing the interior space of said cylinder into first and second chambers;
- a fluid path means for establising fluid communication between said first and second fluid chambers;
- a flow restricting valve means associated with said fluid path means for restricting fluid flow therethrough for generating a damping force which has an essentially linear variation characteristic in relation to piston stroke;
- a closure member closing one end of said cylinder and defining therethrough a through opening, through which said piston rod extends for external connection;
- and
- a seal ring disposed between the outer periphery of said piston rod and the inner periphery of said through opening of said closure member for establishing fluid tight sealing therebetween, said seal ring assuring the essentially linear variation characteristic of said damping force.
4 more elements
Dependencies are inferred from the claim text.