US4934761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-generating device for braking circuits of motor vehicles
Assignee: Renault SA
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Filing: 1989-02-23
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Granted: 1990-06-19
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Expires: 2009-02-23
Abstract
Abstract Pressure-generating device for braking circuits of motor vehicles of the type having electric motors for controlling a device for generating braking pressure. Electric motors (15), associated with each wheel (1, 1', 2, 2') or pair of wheels (1,1'-2,2') of the same axle, drive positive displacement pumps (16) generating the braking pressure for cylinders (7) of brakes (3 to 6).
Inventors
- 👤 Jean-Claude Sauvageot
- 👤 Didier Merletti
- 👤 Jean-Francois Louviot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:51
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/343; B60T8/344; B60T8/345; B60T13/00; B60T13/10; B60T13/66; B60T13/74; B60T13/745; B60T13/746; B60T8/17; B60T8/176; B60T8/1761; B60T8/17616; B60T8/1766; B60T8/26; B60T8/266; F; F16; F16D; F16D65/00; F16D65/14; F16D65/16; F16D65/18; F16D2121/00; F16D2121/18; F16D2121/24; F16D2123/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
A braking pressure generating device in a motor vehicle having at least one braking means responsive to hydraulic braking pressure for braking the vehicle, comprising: a reversible electric motor; a positive displacement pump driven by said motor and connected to said braking means for supplying hydraulic braking pressure to said braking means in proportion to the displacement of said pump; and regulating means responsive to a braking signal for controlling the reversible rotation of said electric motor such that the hydraulic braking pressure is controlled.
Claim 2
Dependent Claim
85 words
A braking pressure generating device in a motor vehicle having at least one braking means responsive to hydraulic braking pressure for braking the vehicle, comprising: a reversible electric motor; a positive displacement pump driven by said motor and connected to said braking means for supplying hydraulic braking pressure to said braking means in proportion to the displacement of said pump; and regulating means responsive to a braking signal for controlling the reversible rotation of said electric motor such that the hydraulic braking pressure is controlled.
Claim 3
Dependent Claim
23 words
The device of claim 1 wherein said regulating means is responsive to a braking signal from a driver and vehicle driving condition signal.
Claim 4
Dependent Claim
26 words
The device of claim 2 wherein said vehicle driving condition signal is at least one of a rear axle load signal and a wheel speed signal.
Claim 5
Independent Claim
74 words
The device of claims 1 or 2 or 3 including a brake master cylinder, wherein said braking means comprises a slave cylinder having a piston movable for braking the vehicle and defining: a first pressure chamber to which said positive displacement pump is connected; and a second pressure chamber independent of said first pressure chamber and connected to said brake master cylinder, whereby said braking means may be independently actuated by said master cylinder.
Claim 6
Independent Claim
27 words
The device according to claims 1 or 2 or 3 including two electrical power sources, each connected to said electric motor via a separate switching contact relay.
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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |