Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1997-07-01
2000-03-28
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031153, B60T 1352
Patent
active
060421991
ABSTRACT:
In case of reducing pressures according to an ABS of the present invention, solenoid valves 14, 15 are turned on and the pressure difference between chambers 24, 23 of a vacuum booster 4 becomes smaller, thereby reducing the brake pressures. Further, solenoid valves 7, 9 are turned on so that brake fluid in W/Cs 8 is discharged to sumps 10, thereby further reducing the brake pressures. At this point, the pressure difference between chambers 55, 56 of a vacuum driven pump 51 also becomes smaller so as to move pistons 54, 61, 62 backward and the brake fluid of the sumps 10 is thus sucked into fluid chambers 63, 64. In case of increasing pressures by the ABS control, the solenoid valves 14, 15, 7, 9 are turned off and the pressure difference between the chambers 24, 23 becomes larger, thereby increasing the brake pressures. At this point, the pressure difference between the chambers 55, 56 becomes larger so as to move the pistons 54, 61, 62 forward and the brake fluid in the fluid chambers 63, 64 is sent to a MCY. Therefore, a pump driven by a motor is no longer required, thereby allowing the ABS to be manufactured lighter and at a lower cost and, in addition, allowing both smaller noise and smaller kick back.
REFERENCES:
patent: 4807946 (1989-02-01), Bertone et al.
patent: 4848848 (1989-07-01), Klein
Graham Matthew C.
Jidosha Kiki Co. Ltd.
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