US3719400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheel lock control modulator
Assignee: Motors Liquidation Co
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Filing: 1971-11-03
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Granted: 1973-03-06
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Expires: 1991-11-03
Abstract
Abstract A wheel lock control system in which the brake apply pressure modulator is divided into four chambers, one always subjected to atmospheric pressure and normally providing pressure support to the hydraulic displacement piston, one always being subjected to vacuum during operation, and the other two being subjected to vacuum or atmospheric air pressure or some intermediate pressure depending upon the system operational mode to control movement of the brake apply pressure modulating valve displacement piston. Two of the chambers are separated by a divider plate which also act as a spring seat for a hydraulic support pressure support spring as well as providing a locking arrangement for holding the outer annulus of a support diaphragm in sealed position against a portion of the modulator housing.
Inventors
- 👤 D Schenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:50
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4208; B60T8/4225; B60T8/4241; B60T8/425
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
476 words
In a wheel lock control mechanism for a vehicle having wheel brake means to be controlled, a source of brake supply and apply pressure and a source of vacuum, conduit means connecting the brake supply and apply pressure source to the wheel brake means, brake apply pressure modulating valve means in the conduit means, and wheel lock control sensor and logic control means sensing the conditions of the wheel means with which the wheel brake means is associated and generating modulator control signals; the improvement comprising a modulator including: said modulating valve means having a displacement piston as a part thereof; a housing having a first chamber and a second chamber separated by an upper support plate and diaphragm, a divider plate and diaphragm separating said second chamber and a third chamber, and a lower support plate and diaphragm separating said third chamber and a fourth chamber; support spring means acting on said upper support plate and operatively urging said displacement piston to the normal brake apply position in which said modulating valve means permits substantially unrestricted passage of brake fluid and pressure between the brake pressure source and the wheel brake means; a support plate carrier joining said upper and lower support plates and having a passage therethrough continuously fluid connecting said first and third chambers; conduit means including check valve means fluid connecting the vacuum source and said second chamber; port means continuously fluid connecting said fourth chamber to atmospheric air; and control valve means connected to be controlled by the modulator control signals generated by the wheel lock control sensor and logic control means and selectively fluid connecting said first chamber with the vacuum source and said second chamber when the normal brake apply condition is required and, when a brake release condition is required, fluid disconnecting said first chamber from the vacuum source and from said second chamber and fluid connecting said first chamber to atmospheric air; hydraulic brake apply pressure support being provided by said support spring and also by the pressure differential of said third and fourth chambers acting across said lower support plate and diaphragm during normal brake apply, the portion of said hydraulic brake apply pressure support provided by the pressure differential being decreased when the brake release condition is required in accordance with the decrease in pressure differential between said third and fourth chambers as said first and third chambers are opened to atmospheric air under control of said control valve means; the increase in pressure differential of said first and second chambers, caused by the admission of atmospheric air to said first chamber by said control valve means, acting on said upper support plate and diaphragm to overcome the force of said support spring and permit movement of said displacement piston under influence of brake apply pressure to effect a decrease in the brake apply pressure.
Claim 2
Dependent Claim
476 words
In a wheel lock control mechanism for a vehicle having wheel brake means to be controlled, a source of brake supply and apply pressure and a source of vacuum, conduit means connecting the brake supply and apply pressure source to the wheel brake means, brake apply pressure modulating valve means in the conduit means, and wheel lock control sensor and logic control means sensing the conditions of the wheel means with which the wheel brake means is associated and generating modulator control signals; the improvement comprising a modulator including: said modulating valve means having a displacement piston as a part thereof; a housing having a first chamber and a second chamber separated by an upper support plate and diaphragm, a divider plate and diaphragm separating said second chamber and a third chamber, and a lower support plate and diaphragm separating said third chamber and a fourth chamber; support spring means acting on said upper support plate and operatively urging said displacement piston to the normal brake apply position in which said modulating valve means permits substantially unrestricted passage of brake fluid and pressure between the brake pressure source and the wheel brake means; a support plate carrier joining said upper and lower support plates and having a passage therethrough continuously fluid connecting said first and third chambers; conduit means including check valve means fluid connecting the vacuum source and said second chamber; port means continuously fluid connecting said fourth chamber to atmospheric air; and control valve means connected to be controlled by the modulator control signals generated by the wheel lock control sensor and logic control means and selectively fluid connecting said first chamber with the vacuum source and said second chamber when the normal brake apply condition is required and, when a brake release condition is required, fluid disconnecting said first chamber from the vacuum source and from said second chamber and fluid connecting said first chamber to atmospheric air; hydraulic brake apply pressure support being provided by said support spring and also by the pressure differential of said third and fourth chambers acting across said lower support plate and diaphragm during normal brake apply, the portion of said hydraulic brake apply pressure support provided by the pressure differential being decreased when the brake release condition is required in accordance with the decrease in pressure differential between said third and fourth chambers as said first and third chambers are opened to atmospheric air under control of said control valve means; the increase in pressure differential of said first and second chambers, caused by the admission of atmospheric air to said first chamber by said control valve means, acting on said upper support plate and diaphragm to overcome the force of said support spring and permit movement of said displacement piston under influence of brake apply pressure to effect a decrease in the brake apply pressure.
Claim 3
Dependent Claim
476 words
In a wheel lock control mechanism for a vehicle having wheel brake means to be controlled, a source of brake supply and apply pressure and a source of vacuum, conduit means connecting the brake supply and apply pressure source to the wheel brake means, brake apply pressure modulating valve means in the conduit means, and wheel lock control sensor and logic control means sensing the conditions of the wheel means with which the wheel brake means is associated and generating modulator control signals; the improvement comprising a modulator including: said modulating valve means having a displacement piston as a part thereof; a housing having a first chamber and a second chamber separated by an upper support plate and diaphragm, a divider plate and diaphragm separating said second chamber and a third chamber, and a lower support plate and diaphragm separating said third chamber and a fourth chamber; support spring means acting on said upper support plate and operatively urging said displacement piston to the normal brake apply position in which said modulating valve means permits substantially unrestricted passage of brake fluid and pressure between the brake pressure source and the wheel brake means; a support plate carrier joining said upper and lower support plates and having a passage therethrough continuously fluid connecting said first and third chambers; conduit means including check valve means fluid connecting the vacuum source and said second chamber; port means continuously fluid connecting said fourth chamber to atmospheric air; and control valve means connected to be controlled by the modulator control signals generated by the wheel lock control sensor and logic control means and selectively fluid connecting said first chamber with the vacuum source and said second chamber when the normal brake apply condition is required and, when a brake release condition is required, fluid disconnecting said first chamber from the vacuum source and from said second chamber and fluid connecting said first chamber to atmospheric air; hydraulic brake apply pressure support being provided by said support spring and also by the pressure differential of said third and fourth chambers acting across said lower support plate and diaphragm during normal brake apply, the portion of said hydraulic brake apply pressure support provided by the pressure differential being decreased when the brake release condition is required in accordance with the decrease in pressure differential between said third and fourth chambers as said first and third chambers are opened to atmospheric air under control of said control valve means; the increase in pressure differential of said first and second chambers, caused by the admission of atmospheric air to said first chamber by said control valve means, acting on said upper support plate and diaphragm to overcome the force of said support spring and permit movement of said displacement piston under influence of brake apply pressure to effect a decrease in the brake apply pressure.
Claim 4
Dependent Claim
476 words
In a wheel lock control mechanism for a vehicle having wheel brake means to be controlled, a source of brake supply and apply pressure and a source of vacuum, conduit means connecting the brake supply and apply pressure source to the wheel brake means, brake apply pressure modulating valve means in the conduit means, and wheel lock control sensor and logic control means sensing the conditions of the wheel means with which the wheel brake means is associated and generating modulator control signals; the improvement comprising a modulator including: said modulating valve means having a displacement piston as a part thereof; a housing having a first chamber and a second chamber separated by an upper support plate and diaphragm, a divider plate and diaphragm separating said second chamber and a third chamber, and a lower support plate and diaphragm separating said third chamber and a fourth chamber; support spring means acting on said upper support plate and operatively urging said displacement piston to the normal brake apply position in which said modulating valve means permits substantially unrestricted passage of brake fluid and pressure between the brake pressure source and the wheel brake means; a support plate carrier joining said upper and lower support plates and having a passage therethrough continuously fluid connecting said first and third chambers; conduit means including check valve means fluid connecting the vacuum source and said second chamber; port means continuously fluid connecting said fourth chamber to atmospheric air; and control valve means connected to be controlled by the modulator control signals generated by the wheel lock control sensor and logic control means and selectively fluid connecting said first chamber with the vacuum source and said second chamber when the normal brake apply condition is required and, when a brake release condition is required, fluid disconnecting said first chamber from the vacuum source and from said second chamber and fluid connecting said first chamber to atmospheric air; hydraulic brake apply pressure support being provided by said support spring and also by the pressure differential of said third and fourth chambers acting across said lower support plate and diaphragm during normal brake apply, the portion of said hydraulic brake apply pressure support provided by the pressure differential being decreased when the brake release condition is required in accordance with the decrease in pressure differential between said third and fourth chambers as said first and third chambers are opened to atmospheric air under control of said control valve means; the increase in pressure differential of said first and second chambers, caused by the admission of atmospheric air to said first chamber by said control valve means, acting on said upper support plate and diaphragm to overcome the force of said support spring and permit movement of said displacement piston under influence of brake apply pressure to effect a decrease in the brake apply pressure.
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |