Hydraulic brake controller
First Claim
1. A hydraulic controller for providing regulated transfer of pressurized fluid between a tank, an accumulator serviced by a source of pressurized fluid, and the brakes of a vehicle comprising, housing means, actuator plunger means extending into said housing means, regulator spring means operatively connected to said actuator plunger means, means for selectively moving said actuator plunger means to controllably compress said regulator spring means, a regulating spool variably positioned by said regulator spring means and the pressurized fluid to relieve pressurized fluid in the brakes to the tank and to provide pressurized fluid from the accumulator to the brakes at a pressure proportional to the compression of said regulator spring means, and means permitting the pressurized fluid provided to the brakes and balancing the compression of said regulator spring means to operate on only a portion of the radial extent of said regulating spool.
3 Assignments
0 Petitions
Accused Products
Abstract
A hydraulic controller for providing regulated transfer of pressurized fluid between a tank (T), an accumulator (A) serviced by a source of pressurized fluid (PS), and the brakes (B) of a vehicle including a housing (36,37; 236,237), an actuator plunger (45; 245) extending into the housing, a regulator spring (57; 257) operatively connected to the actuator plunger, and actuator (11; 247) for selectively moving the actuator plunger to controllably compress the regulator spring, and a regulating spool (65; 265) variably positioned by the regulator spring and the pressurized fluid to relieve pressurized fluid in the brakes to the tank and to provide pressurized fluid from the accumulator to the brakes at a pressure proportional to the compression of the regulator spring. The regulator spring may be a plurality of staged springs (161,165) to provide different spring rates and an override (330) may be provided on the actuator plunger for selectively compressing the regulator spring in response to a pressurized fluid input.
7 Citations
36 Claims
- 1. A hydraulic controller for providing regulated transfer of pressurized fluid between a tank, an accumulator serviced by a source of pressurized fluid, and the brakes of a vehicle comprising, housing means, actuator plunger means extending into said housing means, regulator spring means operatively connected to said actuator plunger means, means for selectively moving said actuator plunger means to controllably compress said regulator spring means, a regulating spool variably positioned by said regulator spring means and the pressurized fluid to relieve pressurized fluid in the brakes to the tank and to provide pressurized fluid from the accumulator to the brakes at a pressure proportional to the compression of said regulator spring means, and means permitting the pressurized fluid provided to the brakes and balancing the compression of said regulator spring means to operate on only a portion of the radial extent of said regulating spool.
- 15. A hydraulic controller for providing regulated transfer of pressurized fluid between a tank, an accumulator serviced by a source of pressurized fluid, and the brakes of a vehicle comprising, housing means, actuator plunger means extending into said housing means, regulator spring means operatively connected to said actuator plunger means, means for selectively moving said actuator plunger means to controllably compress said regulator spring means, a regulating spool variably positioned by said regulator spring means and the pressurized fluid to relieve pressurized fluid in the brakes to the tank and to provide pressurized fluid from the accumulator to the brakes at a pressure proportional to the compression of said regulator spring means, and means in said housing means for moving said regulating spool to provide pressurized fluid from the accumulator to the brakes upon a predetermined reduction of pressure of the pressurized fluid in the accumulator.
- 23. A hydraulic controller for providing regulated transfer of pressurized fluid between a tank, an accumulator serviced by a source of pressurized fluid, and the brakes of a vehicle comprising, housing means, actuator plunger means extending into said housing means, regulator spring means operatively connected to said actuator plunger means, means for selectively moving said actuator plunger means to controllably compress said regulator spring means, a regulating spool variably positioned by said regulator spring means and the pressurized fluid to relieve pressurized fluid in the brakes to the tank and to provide pressurized fluid from the accumulator to the brakes at a pressure proportional to the compression of said regulator spring means, and override means associated with said actuator plunger means for selectively compressing said regulator spring means in response to a pressurized fluid input.
- 28. A hydraulic controller for providing regulated transfer of pressurized fluid between a tank, an accumulator serviced by a source of pressurized fluid, and the brakes of a vehicle comprising, housing means, actuator plunger means extending into said housing means, regulator spring means operatively connected to said actuator plunger means, means for selectively moving said actuator plunger means to controllably compress said regulator spring means, and a regulating spool variably positioned by said regulator spring means and the pressurized fluid to relieve pressurized fluid in the brakes to the tank and to provide pressurized fluid from the accumulator to the brakes at a pressure proportional to the compression of said regulator spring means, said regulator spring means being staged to provide a plurality of different spring rates over the travel of said regulator plunger means.
- 34. A hydraulic controller for providing regulated transfer of pressurized fluid between a tank, an accumulator serviced by a source of pressurized fluid, and the brakes of a vehicle comprising, housing means, actuator plunger means extending into said housing means, regulator spring means operatively connected to said actuator plunger means, means for selectively moving said actuator plunger means to controllably compress said regulator spring means, a regulating spool variably positioned by said regulator spring means and the pressurized fluid to relieve pressurized fluid in the brakes to the tank and to provide pressurized fluid from the accumulator to the brakes at a pressure proportional to the compression of said regulator spring means, and a pressure switch sensing the supply of pressurized fluid from the source of pressurized fluid to said accumulator, said pressure switch having a spring-loaded shaft balanced against normal operating pressure of the source of pressurized fluid.
Specification