Brakes – Internal-resistance motion retarder – Using a rotary-type fluid damper
Patent
1994-12-05
1995-11-14
Butler, Douglas C.
Brakes
Internal-resistance motion retarder
Using a rotary-type fluid damper
188294, 188290, 303 10, F16D 5706
Patent
active
054658179
ABSTRACT:
A hydraulic brake coupled to a rotary shaft including a hydraulic pump connected to the shaft, the pump having a pump inlet, and a pump outlet, a hydraulic loop having an inlet part connected to the pump outlet and an outlet part connected to the pump inlet, a flow control device positioned in the hydraulic loop between the inlet outlet parts for controlling flow of hydraulic fluid in the hydraulic loop, and a brake actuator connected to the flow control device for reducing the flow of hydraulic fluid in response to operation of the brake actuator. There is provided a hydraulic brake wherein the hydraulic pump includes a pump cylinder with a pump piston in the pump cylinder, a one way inlet valve in the pump cylinder fluidly communicating with the hydraulic loop outlet part, a one way outlet valve in the pump cylinder fluidly communicating with the hydraulic inlet part, reciprocating device in operative engagement with the pump piston for reciprocatingly moving the pump piston in the pump cylinder, the reciprocating device coupled to the rotary shaft. The hydraulic brake includes a camshaft, at least one cam on the cam shaft in operative engagement with the pump piston for driving the pump piston into the pump cylinder with each revolution of the camshaft, and hydraulic fluid bias pressure supply device for applying fluid bias pressure to the hydraulic fluid in fluid communication with the hydraulic loop outlet part.
REFERENCES:
patent: 1658960 (1928-02-01), Adams
patent: 2845149 (1958-07-01), Stern et al.
patent: 5373921 (1994-12-01), Muscatell
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