Patent US3756664A successfully refreshed from Google Patents.
US3756664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle brake system
Assignee: TDK Micronas GmbH
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Filing: 1972-03-28
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Granted: 1973-09-04
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Expires: 1992-03-28
Abstract
Abstract A vehicle brake system including an antiskid device and a pump driven circulation type hydraulic brake booster wherein the booster and the antiskid device are supplied with brake pressure medium from a single pump. The antiskid device includes a deceleration sensor associated with at least one vehicle wheel, an electronic control unit coupled to the sensor to produce an incipient skid signal and a normally open brake pressure medium actuated valve coupled to the single pump and in the brake line coupled between the master cylinder associated with the brake booster and the vehicle wheels for control of the brake pressure applied to these wheels. A normally open solenoid actuated valve is present in the pressure medium line between the single pump and the brake booster. When an incipient skid signal is generated the solenoid actuated valve is closed and the pressure medium from the signal pump closes the brake pressure medium actuated valve to prevent a further increase in braking force on the controlled wheels.
Inventors
- 👤 E Schlitz
- 👤 W Fink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:58
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4208; B60T8/4225; B60T8/4233; Y; Y10; Y10S; Y10S303/00; Y10S303/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
259 words
A brake system for a vehicle comprising: a reservoir for brake pressure medium having an input and an output; a pump for brake pressure medium directly connected to the output of said reservoir; a pump driven circulation type brake pressure medium brake booster, said brake booster being directly connected to the input of said reservoir; a master cylinder directly connected to said brake booster and said pump; at least one vehicle wheel brake to have braking force applied thereto; a solenoid actuated valve directly connected between said pump and said booster to enable direct actuation of said booster by said pump, said solenoid actuated valve having a normal open position and a closed position; a brake pressure medium actuated valve having a pressure medium input controllably connected to a pressure medium output and a pressure medium actuating input directly connected to said pump, said pressure medium input being directly connected to said master cylinder and said pressure medium output being directly connected to said wheel brake; and means directly connected to said solenoid actuated valve and coupled to at least the wheel having said wheel brake to generate a control signal when an incipient skid condition of said wheel is present; said solenoid actuated valve responding to said control vehicle for switching thereof to said closed position to disconnect said pump from said booster and to enable said pump to actuate said pressure medium actuated valve so as to disconnect said master cylinder from said wheel brake to prevent a further increase in braking force in said wheel brake.
Claim 2
Dependent Claim
259 words
A brake system for a vehicle comprising: a reservoir for brake pressure medium having an input and an output; a pump for brake pressure medium directly connected to the output of said reservoir; a pump driven circulation type brake pressure medium brake booster, said brake booster being directly connected to the input of said reservoir; a master cylinder directly connected to said brake booster and said pump; at least one vehicle wheel brake to have braking force applied thereto; a solenoid actuated valve directly connected between said pump and said booster to enable direct actuation of said booster by said pump, said solenoid actuated valve having a normal open position and a closed position; a brake pressure medium actuated valve having a pressure medium input controllably connected to a pressure medium output and a pressure medium actuating input directly connected to said pump, said pressure medium input being directly connected to said master cylinder and said pressure medium output being directly connected to said wheel brake; and means directly connected to said solenoid actuated valve and coupled to at least the wheel having said wheel brake to generate a control signal when an incipient skid condition of said wheel is present; said solenoid actuated valve responding to said control vehicle for switching thereof to said closed position to disconnect said pump from said booster and to enable said pump to actuate said pressure medium actuated valve so as to disconnect said master cylinder from said wheel brake to prevent a further increase in braking force in said wheel brake.
Claim 3
Dependent Claim
21 words
A brake system according to claim 1, further including a throttle valve directly connected in parallel relationship with said solenoid valve.
Claim 4
Dependent Claim
69 words
A brake system according to claim 2, further including a prEssure relief valve connected in parallel relationship with said pump and said reservoir to limit the pressure at the output of said pump to a given value, said pressure relief valve being oriented to enable brake pressure medium flow from the output of said pump to the input of said reservoir to limit said pressure to said given value.
Claim 5
Dependent Claim
69 words
A brake system according to claim 1, further including a pressure relief valve connected in parallel relationship with said pump and said reservoir to limit the pressure at the output of said pump to a given value, said pressure relief valve being oriented to enable brake pressure medium flow from the output of said pump to the input of said reservoir to limit said pressure to said given value.
References Cited (Backward Citations)
US2941845A
Cited
US3401982A
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US3477765A
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US3532391A
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US3514161A
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US3539227A
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |