US3914941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metering valve for proportioning an input force between concentric pistons
Assignee: Bendix Corp
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Filing: 1974-06-20
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Granted: 1975-10-28
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Expires: 1994-06-20
Abstract
Abstract A metering valve apparatus for transferring a servomotor force from a first piston to a second piston in response to an input force to produce an operational braking force. The first and second pistons are initially simultaneously moved by a differential pressure responsive movable wall to pressurize fluid in interconnected first and second chambers in response to the input force. A predetermined input force will independently move the second piston with respect to the first piston to interrupt the communication between the first chamber and the second chamber and allow pressurized fluid to escape into a third chamber. As the pressurized fluid escapes into the third chamber the wall will move to supply the second piston with the servomotor force to further pressurize the fluid in the second chamber.
Inventors
- 👤 Delbert J Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:29
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; B60T13/565
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
325 words
In a power braking system having a servomotor for supplying an operational force to wheel brakes upon simultaneous movement of a first piston and a second piston by a differential pressure force transmitted through a wall to produce a first operational fluid pressure in response to an input force, metering means for proportionally transferring that portion of the differential pressure force transmitted through the first piston to the second piston when the second piston is independently moved by the input force to produce a second operational fluid pressure, said metering means comprising: a housing having a bore therein, said first piston being located within the bore to form a first chamber therein, said second piston being located within the bore to form a second chamber therein, said first chamber being connected to a third chamber, said first chamber being connected to a third chamber through a first passage, said first chamber being connected to the second chamber through a second passage; first valve means associated with the first passage for controlling fluid communication between the first chamber and the third chamber, said first valve means being closed during said simultaneous movement; second valve means associated with the second passage for controlling fluid communication between the first chamber and the second chamber, said second valve means being opened during said simultaneous movement; and connector means located between said first valve means and the second valve means for operating the first valve means after the second valve means is closed through the independent movement of the second piston to permit the first fluid pressure present in the first chamber to be proportionally communicated to the third chamber as a function of the input force which moves the second piston in opposition to the operational force to allow the wall to move the first piston and close the first valve means while transmitting a differential pressure force to the second piston for establishing the second operational fluid pressure.
Claim 2
Dependent Claim
325 words
In a power braking system having a servomotor for supplying an operational force to wheel brakes upon simultaneous movement of a first piston and a second piston by a differential pressure force transmitted through a wall to produce a first operational fluid pressure in response to an input force, metering means for proportionally transferring that portion of the differential pressure force transmitted through the first piston to the second piston when the second piston is independently moved by the input force to produce a second operational fluid pressure, said metering means comprising: a housing having a bore therein, said first piston being located within the bore to form a first chamber therein, said second piston being located within the bore to form a second chamber therein, said first chamber being connected to a third chamber, said first chamber being connected to a third chamber through a first passage, said first chamber being connected to the second chamber through a second passage; first valve means associated with the first passage for controlling fluid communication between the first chamber and the third chamber, said first valve means being closed during said simultaneous movement; second valve means associated with the second passage for controlling fluid communication between the first chamber and the second chamber, said second valve means being opened during said simultaneous movement; and connector means located between said first valve means and the second valve means for operating the first valve means after the second valve means is closed through the independent movement of the second piston to permit the first fluid pressure present in the first chamber to be proportionally communicated to the third chamber as a function of the input force which moves the second piston in opposition to the operational force to allow the wall to move the first piston and close the first valve means while transmitting a differential pressure force to the second piston for establishing the second operational fluid pressure.
Claim 3
Dependent Claim
72 words
In the power braking system, as recited in claim 1, wherein said connector means includes: a first stem extending from the first valve means toward the second valve means; a second stem extending from the second valve means toward the first valve means; and linkage means attached to the first stem and the second stem for permitting the operation of the first valve means and the second valve means to sequentially occur.
Claim 4
Dependent Claim
103 words
In the power braking system, as recited in claim 2, wherein said linkage means includes: a sleeve connected to the first stem and the second stem, said sleeve having a first slot and a second slot; first pin means located in said first slot and attached to the first stem; and second pin means located in said second slot and attached to the second stem, said individual movement by the second piston causing the second pin to move in the second slot and engage the sleeve which in turn transmits movement to the first stem through the engagement of the first pin means.
Claim 5
Dependent Claim
76 words
In the power braking system, as recited in claim 3, wherein said first valve means includes: first ball means located in said first passage and attached to said first stem; and first resilient means connected to the first piston for urging said first valve means toward a first seat to prevent the fluid pressure developed in the first chamber during the simultaneous movement of the first and second pistons from being communicated to the third chamber.
Claim 6
Dependent Claim
75 words
In the power braking system, as recited in claim 4, wherein said second valve means includes: second ball means located in said second passage and attached to said second stem; and second resilient means connected to the second piston for urging the second valve means toward a second seat during said independent movemeNt of the second piston to prevent said second operational fluid pressure from being communicated from the second chamber to the first chamber.
Claim 7
Dependent Claim
45 words
In the power braking system, as recited in claim 5, wherein said metering means further includes: reaction means for providing an operator with an indication of the first operational fluid pressure and the second operational fluid pressure produced in response to the operational input force.
Claim 8
Dependent Claim
67 words
In the power braking system, as recited in claim 6, wherein said reaction means includes: means having first and second portions for engaging said second piston, said first portion transmitting the output from the wall to move the second piston; and said second portion providing the operator with an indication of the first and second operational fluid pressure being produced in response to movement of the wall.
References Cited (Backward Citations)
US3031850A
Cited
US3514163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |