Fluid-pressure and analogous brake systems – Pulsation neutralizers
Patent
1997-06-13
1999-10-19
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Pulsation neutralizers
138 26, 303DIG11, F16L 5500, B60T 1700
Patent
active
059676230
ABSTRACT:
A hydraulic control unit for a hydraulic vehicle control system, such as anti-lock brakes, includes a hydraulic accumulator including a housing that defines a cavity and a passageway that extends from the cavity and that is adapted for inner-connection with a host hydraulic circuit, preferably adjacent the high pressure outlet of the host system hydraulic pump. A closure member cooperates with the housing to substantially seal the cavity. A pre-loaded elastomeric member is disposed within the cavity and is compressible with increasing hydraulic fluid pressure to attenuate short duration pressure pulses therein. The elastomeric member is preferably enclosed within a rigid relatively porous member that, in combination with the elastomeric member, substantially fills the entire volume of the cavity and permits pressurized fluid to act on substantially the entire outer surface of the elastomeric member to minimize internal friction and hysterisis losses and provides the structure, along with the closure member, to pre-load the elastomeric member.
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Butler Douglas C.
ITT Manufacturing Enterprises Inc.
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