Hydraulic damper of adjustable damping force type
AssigneeTokico Ltd.
InventorAkihiro Shimokura
Life of this patent
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Abstract
A hydraulic damper of the adjustable damping force type includes a piston working in a cylinder and partitioning the interior of the piston into two liquid chambers, a first passage provided in the piston for connecting the two liquid chambers, a first damping force generating valve mechanism provided on the piston for generating a damping force in response to liquid flow in the first passage, a by-pass passage for connecting the two liquid chambers and by-passing the first passage, and an adjusting valve for controlling the effective passage area of the by-pass passage. A second damping force generating valve mechanism is provided in the by-pass passage and generates a damping force substantially smaller than the damping force of the first damping force generating valve mechamism.
Claims6
A hydraulic damper of the adjustable damping force type comprising:
- a piston working in a cylinder and partitioning the interior thereof into two liquid chambers;
- a piston rod secured to said piston and extending to the outside of said cylinder;
- a first passage means for connecting said two liquid chambers;
- a first damping force generating valve means comprising first and second oppositely opening resilient valve disc means provided in said first passage means for generating a relatively high damping force both in the extension and contraction strokes of said damper;
- a second passage means for connecting said two liquid chambers independently from said first passage means;
- a second damping force generating valve means comprising a resilient valve disc provided in said second passage means for generating a relatively low damping force both in the extension and contraction strokes of said damper as said valve disc opens in respective opposite directions;
- and
- adjusting valve means provided in said piston rod and controlling the effective passage area of said second passage means.
Dependencies are inferred from the claim text.