Brakes – Internal-resistance motion retarder – Controlled by an operator remote from retarder
Patent
1989-08-10
1990-09-04
Kashnikow, Andres
Brakes
Internal-resistance motion retarder
Controlled by an operator remote from retarder
188282, 188285, 188319, 18832215, F10F 944
Patent
active
049536710
ABSTRACT:
A hydraulic shock absorber is used, for example, in a vehicle, wherein the level of damping force is adjustable in accordance with the road surface conditions or the like during operation of the vehicle. The hydraulic shock absorber includes a piston attached to one end of a piston rod and slidably fitted in a cylinder, the piston dividing the interior of the cylinder into two cylinder chambers. A passage is provided in the piston, the passage communicating with each of the two cylinder chambers. A damping force generating valve is provided at the downstream side of the passage to generate damping force. A back-pressure chamber is formed at the side of the damping force generating valve which is remote from the piston to apply pressure to the valve. A bypass passage is formed in the piston rod to provide communication between the back-pressure chamber and the upstream cylinder chamber that is provided at the upstream side of the passage. A shutter is externally operable to control the condition of communication between the upstream cylinder chamber and the back-pressure chamber, thereby adjusting the level of pressure inside the back-pressure chamber. Thus, it is possible to obtain a plurality of damping force characteristics with a single damping force generating valve provided for each of the extension and contraction strokes.
REFERENCES:
patent: 4646883 (1987-03-01), Tanaka
patent: 4653617 (1987-03-01), Casimir et al.
patent: 4660689 (1987-04-01), Hayashi et al.
Graham Matthew C.
Kashnikow Andres
Tokico Ltd.
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