Piston stroke responsive vortex-flow shock absorber
AssigneeNissan Motor Co., Ltd.
InventorsKunihiko Hidaka, Naoto Fukushima, Kazuro Iwata
Life of this patent
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Abstract
A vortex flow hydraulic shock absorber for damping relative displacement of two components comprising a piston provided with a fluid passage therethrough including a pair of vortex chambers formed in a movable valve body disposed between a pair of resilient annular discs in a valve chamber in the piston. The valve body moves against the force of the resilient annular discs in response to an increase in the pressure difference of the working fluid on opposite sides of the piston to positions in which the fluid is permitted to bypass one or both of the vortex chambers as it traverses the piston, thereby varying the damping force of the shock absorber.
Claims7
A vortex-flow shock absorber for damping relative displacement of two components, comprising:
- a hollow cylinder filled with a working fluid and fixed to one of said components for movement therewith;
- a piston sealingly disposed within said hollow cylinder for axial movement and defining upper and lower fluid chambers in said cylinder;
- said piston being fixed to the other of said components for movement therewith;
- means defining a fluid passage through said piston through which working fluid may pass between said upper and lower fluid chambers;
- said fluid passage comprising a first vortex chamber for producing vortex fluid flow which creates a damping force during a piston expansion stroke and a second vortex chamber for producing vortex fluid flow which creates a damping force during a piston compression stroke;
- means responsive to a working fluid pressure difference between said upper and lower fluid chambers exceeding a first predetermined value for permitting a flow of working fluid through said piston to bypass one of said vortex chambers;
- and
- means responsive to a working fluid pressure difference between said upper and lower fluid chambers exceeding a second predetermined value greater than said first value for permitting a flow of working fluid through said piston to bypass the other of said vortex chambers.
Dependencies are inferred from the claim text.