US3695732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure modulating device for use in anti-skid brake system
Assignee: ZF Active Safety US Inc
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Filing: 1970-01-12
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Granted: 1972-10-03
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Expires: 1990-01-12
Abstract
Abstract A pressure proportioning and control mechanism for the fluid supplied to the cylinders of the brakes at the front and rear wheels of a vehicle, the mechanism including a proportioning device having a plungerand adapted to reduce the pressure on the rear wheels relative to the front wheels as the master cylinder pressure is increased, a piston on the plunger, a cylinder for the piston having an inlet and outlet port, means including a source of actuating fluid ancillary to the brake actuating fluid and responsive to a rapid deceleration of a wheel to rapidly reduce the braking pressure thereon, and a solenoid valve controlling the flow of fluid between the ports.
Inventors
- 👤 William Stelzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:55
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4208; B60T8/4225; B60T8/4233; B60T8/26
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
185 words
In a pressure proportioning and control device for the fluid supplied to the cylinders of the brakes at the front and rear wheels of the vehicle, a proportioning device including a pressure modulating valve member for controlling the relative fluid pressure supplied to the front and rear wheels as the master cylinder pressure is increased, said device including a housing having a first port communicable with a master cylinder and a second port communicable with a brake cylinder, fluid passageway means communicating said ports, a plunger movable within said passageway for actuating said valve member, means including a source of actuating fluid ancillary to the brake actuating fluid and responsive to a rapid deceleration of a wheel at one end of the vehicle to rapidly reduce the braking pressure thereon, a piston means for effecting longitudinal movement of said plunger within said passageway for controlling operation of said valve member in response to preselected fluid pressure conditions of said ancillary fluid, and means including a second valve member responsive to an electrical control signal for controlling the application of said ancillary fluid to said piston.
Claim 2
Dependent Claim
185 words
In a pressure proportioning and control device for the fluid supplied to the cylinders of the brakes at the front and rear wheels of the vehicle, a proportioning device including a pressure modulating valve member for controlling the relative fluid pressure supplied to the front and rear wheels as the master cylinder pressure is increased, said device including a housing having a first port communicable with a master cylinder and a second port communicable with a brake cylinder, fluid passageway means communicating said ports, a plunger movable within said passageway for actuating said valve member, means including a source of actuating fluid ancillary to the brake actuating fluid and responsive to a rapid deceleration of a wheel at one end of the vehicle to rapidly reduce the braking pressure thereon, a piston means for effecting longitudinal movement of said plunger within said passageway for controlling operation of said valve member in response to preselected fluid pressure conditions of said ancillary fluid, and means including a second valve member responsive to an electrical control signal for controlling the application of said ancillary fluid to said piston.
Claim 3
Dependent Claim
34 words
In a device as recited in claim 1, wherein pressure is applied to one of the sets of brakes of the front and rear wheels directly from the master cylinder without any proportioning thereof.
Claim 4
Dependent Claim
174 words
In a skid control system for controlling fluid pressure actuated brakes of at least one wheel of a wheeled vehicle, a device including a first control valve for proportioning the fluid pressure supplied from a source of brake actuating fluid to the brakes, said device including a housing having a first port communicable with a master cylinder and a second port communicable with a brake cylinder, fluid passageway means communicating said ports, a plunger movable within said passageway for actuating said valve member, a source of pressurized hydraulic fluid ancillary to the source of brake actuating fluid and provided by the vehicle engine for relieving the pressure of the brake actuating fluid supplied to the brakes in response to said output signal, fluid operated piston means effecting operation of said plunger, and a second control valve movable within a cylinder communicable with said passageway on the opposite sides of said piston means and responsive to an electrical control signal for controlling application of said ancillary fluid to the opposite sides of said piston means.
Claim 5
Dependent Claim
174 words
In a skid control system for controlling fluid pressure actuated brakes of at least one wheel of a wheeled vehicle, a device including a first control valve for proportioning the fluid pressure supplied from a source of brake actuating fluid to the brakes, said device including a housing having a first port communicable with a master cylinder and a second port communicable with a brake cylinder, fluid passageway means communicating said ports, a plunger movable within said passageway for actuating said valve member, a source of pressurized hydraulic fluid ancillary to the source of brake actuating fluid and provided by the vehicle engine for relieving the pressure of the brake actuating fluid supplied to the brakes in response to said output signal, fluid operated piston means effecting operation of said plunger, and a second control valve movable within a cylinder communicable with said passageway on the opposite sides of said piston means and responsive to an electrical control signal for controlling application of said ancillary fluid to the opposite sides of said piston means.
Claim 6
Dependent Claim
24 words
A skid control system as defined in claim 3 which includes engine operated pump means for providing said source of ancillary pressurized hydraulic fluid.
Claim 7
Dependent Claim
164 words
In a pressure proportioning and control device for the fluid supplied to the cylinders of the brakes at the front and rear wheels of the vehicle, a proportioning device, said device including a housing having a first port communicable with a master cylinder and a second port communicable with a brake cylinder, fluid passageway means communicating said ports, a pressure modulating member having a plunger and adapted to proportion the fluid pressure supplied to the front and rear wheels as the master cylinder pressure is increased, a piston on said plunger and reciprocable within said passageway said piston means effecting longitudinal movement of said plunger within said passageway, means including a source of actuating fluid ancillary to the brake actuating fluid and responsive to a rapid deceleration of a wheel at one end of the vehicle to rapidly reduce the braking pressure thereon, and a solenoid valve responsive to an electrical control signal for controlling the application of said ancillary fluid to said piston.
Claim 8
Dependent Claim
164 words
In a pressure proportioning and control device for the fluid supplied to the cylinders of the brakes at the front and rear wheels of the vehicle, a proportioning device, said device including a housing having a first port communicable with a master cylinder and a second port communicable with a brake cylinder, fluid passageway means communicating said ports, a pressure modulating member having a plunger and adapted to proportion the fluid pressure supplied to the front and rear wheels as the master cylinder pressure is increased, a piston on said plunger and reciprocable within said passageway said piston means effecting longitudinal movement of said plunger within said passageway, means including a source of actuating fluid ancillary to the brake actuating fluid and responsive to a rapid deceleration of a wheel at one end of the vehicle to rapidly reduce the braking pressure thereon, and a solenoid valve responsive to an electrical control signal for controlling the application of said ancillary fluid to said piston.
Claim 9
Dependent Claim
37 words
In a device as recited in claim 5, wherein a magnetic pickup device on at least one wheel at one end of the vehicle has its output frequency changed upon the rapid deceleration of the wheel rotation.
Claim 10
Dependent Claim
23 words
In a device as recited in claim 6, wherein electronic means responsive to said change in frequency causes said solenoid to be energized.
Claim 11
Dependent Claim
187 words
In a pressure proportioning and control device for the fluid supplied to the cylinders of the brakes at the front and rear wheels of the vehicle, a proportioning device including a pressure modulating valve means for reducing the pressure on the rear wheels relative to the front wheels as the master cylinder pressure is increased, said proportioning device including a housing provided with an inlet port communicable with a master cylinder, an outlet port communicable with a brake cylinder, a passageway communicating said ports, a plunger in said passageway, spring means urging the plunger toward a position for maintaining the passageway between the inlet and outlet ports open, a piston on the end of the plunger within a cylinder, means including a source of actuating fluid ancillary to the brake actuating fluid and responsive to a rapid deceleration of a wheel at one end of the vehicle to rapidly reduce the braking pressure thereon, and a valve for causing fluid pressure to be applied to the piston for moving the plunger against the spring means for substantially reducing the pressure on the fluid in said brake cylinder.
Claim 12
Dependent Claim
187 words
In a pressure proportioning and control device for the fluid supplied to the cylinders of the brakes at the front and rear wheels of the vehicle, a proportioning device including a pressure modulating valve means for reducing the pressure on the rear wheels relative to the front wheels as the master cylinder pressure is increased, said proportioning device including a housing provided with an inlet port communicable with a master cylinder, an outlet port communicable with a brake cylinder, a passageway communicating said ports, a plunger in said passageway, spring means urging the plunger toward a position for maintaining the passageway between the inlet and outlet ports open, a piston on the end of the plunger within a cylinder, means including a source of actuating fluid ancillary to the brake actuating fluid and responsive to a rapid deceleration of a wheel at one end of the vehicle to rapidly reduce the braking pressure thereon, and a valve for causing fluid pressure to be applied to the piston for moving the plunger against the spring means for substantially reducing the pressure on the fluid in said brake cylinder.
Claim 13
Dependent Claim
31 words
In a device as recited in claim 8, wherein a solenoid operates said valve the energization of the coil of which moves the valve to produce the movement of the piston.
Claim 14
Dependent Claim
34 words
In a device as recited in claim 9, wherein a magnetic pickup device on at least one wheel at one end of the vehicle senses a rapid deceleration by a change in output frequency.
Claim 15
Dependent Claim
23 words
In a device as recited in claim 10, wherein electronic means responsive to said change in frequency causes the solenoid to be energized.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |