Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1990-11-05
1992-12-15
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031161, B60T 832
Patent
active
051710730
ABSTRACT:
A hydraulic pressure control system has a hydraulic pressure control valve which includes a spool slidably received in a housing for axial sliding movement between a rear position in which it permits the communication between an output port and a release port and a front position in which it permits communication between an input port and the output port. The hydraulic pressure control system also has a reaction chamber connected to the output port for providing a hydraulic pressure for biasing the spool rearwardly, and an input pressure working chamber for providing a hydraulic pressure for biasing the spool forwardly, a differential pressure regulating valve is interposed between the output port and the reaction chamber and adapted to be opened in response to the hydraulic pressure from the output port becoming higher than the hydraulic pressure in the reaction chamber by a predetermined value therefor. At an initial stage of the beginning of application of the hydraulic pressure to the input pressure working chamber, the application of the hydraulic pressure to the reaction chamber is cut off, so that the output hydraulic pressure from the output port can be rapidly increased with the spool kept located in the front position to provide a smooth initial operation of the hydraulically operated device connected to the output port.
REFERENCES:
patent: 4755008 (1988-07-01), Imoto et al.
patent: 4765692 (1988-08-01), Miyake
patent: 4964680 (1990-10-01), Nokubo et al.
patent: 4995677 (1991-02-01), Matsuda et al.
Furuya Kohichi
Kojima Takeshi
Matsuda Shohei
Myoi Masaaki
Suzuki Jiro
Ballato Josie A.
Graham Matthew C.
Honda Giken Kogyo Kabushiki Kaisha
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