US3887049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic controls for transmission and brake systems with pressure booster
Assignee: Toyota Motor Corp
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Filing: 1973-03-15
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Granted: 1975-06-03
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Expires: 1993-03-15
Abstract
Abstract In a vehicle having a transmission system and a brake system for providing a doubled braking force, a hydraulic brake control circuit is arranged for interconnecting both the transmission system and the brake system. In the hydraulic brake control circuit, a pump supplies oil under pressure from a supply source to a speed change valve of the transmission system and to a master cylinder of the brake system. A passage is provided from the oil pump and it branches off into separate passages leading to the speed change valve and to the master cylinder. In the passage leading to the speed change valve, a further branch passage is provided with a valve arrangement which is connected to the passage leading to the brake system. An accumulator is arranged in the passage to the brake system for affording a source of pressure for the doubled braking force in the brake system. A valve arrangement is connected to the passage leading to the brake system to assure a source of pressure for the proper operation of the brake system. To assure the proper source of pressure for the brake system, the oil passage is connected directly to the brake system and the brake system is connected, in turn, to the speed change valve.
Inventors
- 👤 Shin Ito
- 👤 Hiroshi Kawaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:29
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/20; B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T13/145; B60W; B60W10/00; B60W10/10; B60W10/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
221 words
In a hydraulic brake control system having a control circuit connected to a transmission and to a brake system in a vehicle including a transmission, brake means for said vehicle, wheel cylinder means for actuating said brake means, and a brake pedal movable between a first and a second position for applying a braking force to said system, the combination comprising master cylinder means in hydraulic communication with said wheel cylinder means for converting force applied through said brake pedal into a corresponding hydraulic pressure, means responsive to movement of said brake pedal for doubling the hydraulic pressure in dependence upon the position of said brake pedal, means for effecting speed change in said transmission, a hydraulic pressure source, a hydraulic pump connected to said hydraulic pressure source, and connecting means extending between said pump and both said means for effecting a speed change and said means for doubling said hydraulic pressure for supplying doubled hydraulic pressure from said pump to each of said means, said connecting means comprising a first passage for connecting said oil pump directly to said master cylinder, a second passage for connecting said speed change means to said first passage, a relief valve positioned in said second passage, and a third passage connected between said master cylinder means and said second passage bypassing said relief passage.
Claim 2
Dependent Claim
221 words
In a hydraulic brake control system having a control circuit connected to a transmission and to a brake system in a vehicle including a transmission, brake means for said vehicle, wheel cylinder means for actuating said brake means, and a brake pedal movable between a first and a second position for applying a braking force to said system, the combination comprising master cylinder means in hydraulic communication with said wheel cylinder means for converting force applied through said brake pedal into a corresponding hydraulic pressure, means responsive to movement of said brake pedal for doubling the hydraulic pressure in dependence upon the position of said brake pedal, means for effecting speed change in said transmission, a hydraulic pressure source, a hydraulic pump connected to said hydraulic pressure source, and connecting means extending between said pump and both said means for effecting a speed change and said means for doubling said hydraulic pressure for supplying doubled hydraulic pressure from said pump to each of said means, said connecting means comprising a first passage for connecting said oil pump directly to said master cylinder, a second passage for connecting said speed change means to said first passage, a relief valve positioned in said second passage, and a third passage connected between said master cylinder means and said second passage bypassing said relief passage.
Claim 3
Dependent Claim
221 words
In a hydraulic brake control system having a control circuit connected to a transmission and to a brake system in a vehicle including a transmission, brake means for said vehicle, wheel cylinder means for actuating said brake means, and a brake pedal movable between a first and a second position for applying a braking force to said system, the combination comprising master cylinder means in hydraulic communication with said wheel cylinder means for converting force applied through said brake pedal into a corresponding hydraulic pressure, means responsive to movement of said brake pedal for doubling the hydraulic pressure in dependence upon the position of said brake pedal, means for effecting speed change in said transmission, a hydraulic pressure source, a hydraulic pump connected to said hydraulic pressure source, and connecting means extending between said pump and both said means for effecting a speed change and said means for doubling said hydraulic pressure for supplying doubled hydraulic pressure from said pump to each of said means, said connecting means comprising a first passage for connecting said oil pump directly to said master cylinder, a second passage for connecting said speed change means to said first passage, a relief valve positioned in said second passage, and a third passage connected between said master cylinder means and said second passage bypassing said relief passage.
Claim 4
Dependent Claim
221 words
In a hydraulic brake control system having a control circuit connected to a transmission and to a brake system in a vehicle including a transmission, brake means for said vehicle, wheel cylinder means for actuating said brake means, and a brake pedal movable between a first and a second position for applying a braking force to said system, the combination comprising master cylinder means in hydraulic communication with said wheel cylinder means for converting force applied through said brake pedal into a corresponding hydraulic pressure, means responsive to movement of said brake pedal for doubling the hydraulic pressure in dependence upon the position of said brake pedal, means for effecting speed change in said transmission, a hydraulic pressure source, a hydraulic pump connected to said hydraulic pressure source, and connecting means extending between said pump and both said means for effecting a speed change and said means for doubling said hydraulic pressure for supplying doubled hydraulic pressure from said pump to each of said means, said connecting means comprising a first passage for connecting said oil pump directly to said master cylinder, a second passage for connecting said speed change means to said first passage, a relief valve positioned in said second passage, and a third passage connected between said master cylinder means and said second passage bypassing said relief passage.
Claim 5
Dependent Claim
40 words
A hydraulic brake control system according to claim 1 wherein said second passage includes valve means for controlling pressure in said second passage, said pressure control valve means being connected to both said speed change means and said relief valve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |