Power plants – Pressure fluid source and motor – Pulsator
Patent
1980-09-25
1982-07-13
Hershkovitz, Abraham
Power plants
Pressure fluid source and motor
Pulsator
60578, 60588, 60589, B60T 1120
Patent
active
043387870
ABSTRACT:
The present invention relates to a brake master cylinder device including a first and a second cylinder bore formed within a body. A piston member is formed with a first piston and a second piston, which are respectively engaged with the first and the second cylinder bores to define a first and a second cylinder chamber, the arrangement being such that when the piston member is moved in a certain direction the volumes of both the first and the second cylinder chambers are reduced together. The piston member is biased in the direction opposite to said certain direction. A fluid conduit opens from the second cylinder chamber for connection to a brake actuator. A first one way valve always allows fluid to flow freely from the first to the second cylinder chamber. A second one way valve allows fluid to flow from a fluid reservoir, within which fluid is kept at atmospheric pressure, to the first cylinder chamber, when the pressure in the first cylinder chamber is below atmospheric pressure. A means is provided for venting the first cylinder chamber, which allows fluid to flow from it to the fluid reservoir, when the pressure of the fluid in the first cylinder chamber rises to a predetermined pressure value. When the first piston member is in its extreme position in said opposite direction, a means for refilling the first cylinder chamber allows fluid to flow freely from the fluid reservoir to the first cylinder chamber, and a means for releasing fluid from the second cylinder chamber allows fluid to flow therefrom to the fluid reservoir. Thus a two-stage performance of brake application is available.
REFERENCES:
patent: 3937021 (1976-02-01), Sisco
patent: 4086770 (1978-05-01), Shaw
patent: 4133178 (1979-01-01), Brooks, Sr.
patent: 4152897 (1979-05-01), Falk
patent: 4156348 (1979-05-01), Brown
patent: 4208881 (1980-06-01), Brademeyer
Hershkovitz Abraham
Toyota Jidosha Kogyo Kabushiki Kaisha
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