US3801159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake proportioning valve with controlled blend back
Assignee: Individual
•
Filing: 1972-11-13
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Granted: 1974-04-02
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Expires: 1992-11-13
Abstract
Abstract A proportioning valve for the hydraulic system of a vehicle to control the braking force on the rear wheels with respect to that on the front wheels. The valve includes a housing formed with an inlet chamber connected to one line of the vehicle''s dual master cylinder, and an outlet chamber in communication with the rear wheel brakes of the vehicle. The valve is normally open, permitting unimpeded fluid flow between the inlet and outlet chambers, during an initial brake application. However, when the pressure level in the outlet chamber reaches a first value, the valve reacts to restrict the flow between the two chambers so that the pressure level in the inlet chamber rises more rapidly than the pressure level in the outlet chamber up to a second value of pressure level within the outlet chamber. Upon attaining the second value of pressure level, the valve is acted upon by a pressure responsive member which causes the pressure level in the outlet chamber to increase at a greater rate than the pressure level in the inlet chamber. The pressure responsive member further includes fluid flow control means for regulating the rate of increase in pressure level in the outlet chamber so that the blend back of pressures between the inlet and outlet is more gradual. This pressure level in the outlet chamber continues to build up at this new accelerated rate until the chamber pressures are substantially the same, at which time the valve opens to establish substantially uninterrupted flow between the chambers.
Inventors
- 👤 K Fulmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:58
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; B60T17/00; B60T17/18; B60T17/22; B60T17/226
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
476 words
In a brake control mechanism for a vehicle hydraulic system: a housing having an inlet port, an outlet port and a bore communicating the inlet port with the outlet port; valve means in the bore dividing the bore into an inlet chamber and an outlet chamber, said inlet and outlet chambers communicating respectively, with the inlet port and the outlet port; said valve means including a valve piston slidably arranged in the bore and provided with a passage therethrough communicating the inlet and outlet chambers, a seat in the passage, a valve member slidably located in the bore for seating on the seat, an internal piston slidably positioned in the passage of the valve piston and having a longitudinal opening in registry with the passage, and a pin element mounted along the longitudinal axis of the internal piston and extending through the passage toward the seat for engagement with the valve member to prevent seating; said valve piston having a smaller diameter end of lesser effective area exposed to fluid pressure in the inlet chamber and a larger diameter end of greater effective area exposed to fluid pressure in the outlet chamber, said valve piston being spring biased to a first position unseating the valve piston from the valve member; said internal piston having opposed annular ends, one annular end having an effective area greater than the effective area of the other annular end, said internal piston being spring biased in a direction causing withdrawal of the pin element from engagement with the valve member, said annular ends being exposed to outlet chamber pressure so that the net force developed on the opposed annular ends of the internal piston acts so as to move the internal piston against the spring bias; said valve piston being responsive to a predetermined pressure level in the outlet chamber to seat said piston against the valve member and subsequently regulate the fluid flow between the chambers so that the fluid pressure level in the inlet chamber rises more rapidly than the fluid pressure level in the outlet chamber rises until a second predetermined pressure level in the outlet chamber is reached whereupon the spring biased internal piston is moved in a direction which drives the pin element against the valve member to unseat the latter so that the fluid pressure level in the outlet chamber rises more rapidly than the fluid pressure level in the inlet chamber until the fluid pressure level in the outlet chamber is almost the same as the fluid pressure level in the inlet chamber, at which time the valve piston and internal piston have moved the valve member to its maximum open position; and fluid flow control means effective upon said outlet chamber reaching its second predetermined pressure level for metering fluid flow from the inlet chamber to the outlet chamber at a predetermined rate.
Claim 2
Dependent Claim
476 words
In a brake control mechanism for a vehicle hydraulic system: a housing having an inlet port, an outlet port and a bore communicating the inlet port with the outlet port; valve means in the bore dividing the bore into an inlet chamber and an outlet chamber, said inlet and outlet chambers communicating respectively, with the inlet port and the outlet port; said valve means including a valve piston slidably arranged in the bore and provided with a passage therethrough communicating the inlet and outlet chambers, a seat in the passage, a valve member slidably located in the bore for seating on the seat, an internal piston slidably positioned in the passage of the valve piston and having a longitudinal opening in registry with the passage, and a pin element mounted along the longitudinal axis of the internal piston and extending through the passage toward the seat for engagement with the valve member to prevent seating; said valve piston having a smaller diameter end of lesser effective area exposed to fluid pressure in the inlet chamber and a larger diameter end of greater effective area exposed to fluid pressure in the outlet chamber, said valve piston being spring biased to a first position unseating the valve piston from the valve member; said internal piston having opposed annular ends, one annular end having an effective area greater than the effective area of the other annular end, said internal piston being spring biased in a direction causing withdrawal of the pin element from engagement with the valve member, said annular ends being exposed to outlet chamber pressure so that the net force developed on the opposed annular ends of the internal piston acts so as to move the internal piston against the spring bias; said valve piston being responsive to a predetermined pressure level in the outlet chamber to seat said piston against the valve member and subsequently regulate the fluid flow between the chambers so that the fluid pressure level in the inlet chamber rises more rapidly than the fluid pressure level in the outlet chamber rises until a second predetermined pressure level in the outlet chamber is reached whereupon the spring biased internal piston is moved in a direction which drives the pin element against the valve member to unseat the latter so that the fluid pressure level in the outlet chamber rises more rapidly than the fluid pressure level in the inlet chamber until the fluid pressure level in the outlet chamber is almost the same as the fluid pressure level in the inlet chamber, at which time the valve piston and internal piston have moved the valve member to its maximum open position; and fluid flow control means effective upon said outlet chamber reaching its second predetermined pressure level for metering fluid flow from the inlet chamber to the outlet chamber at a predetermined rate.
Claim 3
Dependent Claim
47 words
The invention of claim 1: said control means including a second seat in the passage, and a spherical valve element mounted to said pin with the surface of the valve element being matingly contiguous to the second seat for cooperating therewith in regulating flow to the outlet.
Claim 4
Dependent Claim
438 words
In a brake control mechanism for use in a vehIcle hydraulic system: a housing having an inlet port, an outlet port and a bore communicating the inlet port with the outlet port; valve means disposed within the bore and dividing the bore into an inlet chamber and an outlet chamber, said inlet and outlet chambers communicating respectively, with the inlet and outlet ports; said valve means having an open position wherein fluid communication is established between the chambers until a first fluid pressure level in the outlet chamber is reached whereupon the valve means responds to the first fluid pressure level to restrict fluid flow between the chambers to permit the fluid pressure level in the inlet chamber to rise more rapidly than the fluid pressure level in the outlet chamber rises until a second fluid pressure level in the outlet chamber is reached whereupon the valve means reacts to the second pressure level to adjust the valve means so that the fluid pressure level in the outlet chamber now rises more rapidly than the fluid pressure level in the inlet chamber up to a pressure level in the outlet chamber substantially the same as that in the inlet chamber whereupon said valve means opens to permit uninterrupted flow of fluid between the chambers; said valve means having additional means operatively associated therewith which is responsive to the second fluid pressure level in the outlet chamber for establishing a more rapid rise in pressure level in the outlet chamber than that in the inlet chamber and further including fluid flow control means for metering the flow of fluid to the outlet chamber so that the rise in pressure in said outlet chamber is at a predetermined rate; said valve means including a valve member reciprocally disposed in the bore and a valve piston slidably positioned in the bore, said valve piston having a smaller diameter end of lesser effective area exposed to fluid pressure in the inlet chamber and a larger diameter end of greater effective area exposed to fluid pressure in the outlet chamber; said valve member cooperating with said valve piston to control the fluid pressure levels in the chambers; resilient means acting on the smaller diameter end of the valve piston urging it to a position to establish communication between the chambers; said valve piston having a fluid passage therein communicating the inlet chamber with the outlet chamber and an orifice in the passage; and said valve member being positioned adjacent the orifice at the smaller end of the valve piston to open and close the passage to effectively regulate fluid flow through the passage.
Claim 5
Dependent Claim
438 words
In a brake control mechanism for use in a vehIcle hydraulic system: a housing having an inlet port, an outlet port and a bore communicating the inlet port with the outlet port; valve means disposed within the bore and dividing the bore into an inlet chamber and an outlet chamber, said inlet and outlet chambers communicating respectively, with the inlet and outlet ports; said valve means having an open position wherein fluid communication is established between the chambers until a first fluid pressure level in the outlet chamber is reached whereupon the valve means responds to the first fluid pressure level to restrict fluid flow between the chambers to permit the fluid pressure level in the inlet chamber to rise more rapidly than the fluid pressure level in the outlet chamber rises until a second fluid pressure level in the outlet chamber is reached whereupon the valve means reacts to the second pressure level to adjust the valve means so that the fluid pressure level in the outlet chamber now rises more rapidly than the fluid pressure level in the inlet chamber up to a pressure level in the outlet chamber substantially the same as that in the inlet chamber whereupon said valve means opens to permit uninterrupted flow of fluid between the chambers; said valve means having additional means operatively associated therewith which is responsive to the second fluid pressure level in the outlet chamber for establishing a more rapid rise in pressure level in the outlet chamber than that in the inlet chamber and further including fluid flow control means for metering the flow of fluid to the outlet chamber so that the rise in pressure in said outlet chamber is at a predetermined rate; said valve means including a valve member reciprocally disposed in the bore and a valve piston slidably positioned in the bore, said valve piston having a smaller diameter end of lesser effective area exposed to fluid pressure in the inlet chamber and a larger diameter end of greater effective area exposed to fluid pressure in the outlet chamber; said valve member cooperating with said valve piston to control the fluid pressure levels in the chambers; resilient means acting on the smaller diameter end of the valve piston urging it to a position to establish communication between the chambers; said valve piston having a fluid passage therein communicating the inlet chamber with the outlet chamber and an orifice in the passage; and said valve member being positioned adjacent the orifice at the smaller end of the valve piston to open and close the passage to effectively regulate fluid flow through the passage.
Claim 6
Dependent Claim
145 words
The invention of claim 9: said additional means including an internal piston coaxially located in the passage of the valve piston and slidable between a first and a second position; resilient means in the passage urging the internal piston toward the first position; said internal piston having a longitudinal opening therethrough and opposed annular ends, one of the ends having an effective area greater than the effective area of the other annular end, said opposed ends being acted upon by the pressure level existing in the outlet chamber so that a net force is established on the ends of the internal piston tending to slide the piston against the resilient means and toward the second position; and a probe carried by the internal piston and projecting into the passage for engagement with the valve member upon movement of the internal piston to its second position.
Claim 7
Dependent Claim
63 words
The invention of claim 4: said resilient means being a coil spring having opposite ends engaging respectively, the valve piston and the internal piston; said probe being in the form of a pin integral with the internal piston and having a free end extending into the orifice in the smaller diameter end of the valve piston and through the coils of the spring.
Claim 8
Dependent Claim
60 words
The invention of claim 5: said fluid flow control means including a valve element carried on the free end of the pin and a valve seat In the orifice with which the valve element cooperates to establish a predetermined pressure rise in the outlet chamber so that a gradual blend back of pressures between the inlet and outlet is achieved.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |