Patent US703499A successfully refreshed from Google Patents.
Patent EP0140187B1 successfully refreshed from Google Patents.
EP0140187B1
Expired / Lapsed
EP
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Brake booster
Assignee: Nissan Motor Co Ltd
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Filing: 1984-10-01
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Granted: 1990-01-17
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Expires: 2004-10-01
Abstract
No abstract record available.
Inventors
- 👤 Hitoshi Kubota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 14:19
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/66; B60T13/72; B60T13/24; B60T13/241; B60T13/246; B60T13/46; B60T13/52; B60T13/57
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
365 words
A brake booster for augmenting the force applied to a brake of a vehicle comprising: an airtight housing (11), a pressure-differential responsive movable wall (14) dividing the interior of said housing (11) into first (12) and second (13) fluid pressure chambers, said first chamber (12) being held at an essentially constant pressure, an output rod (28) fixed to said movable wall (14) for applying force to the brake of the vehicle in accordance with its movement, a first valve means (36) for controlling communication between said second fluid pressure chamber (13) and atmosphere, a second valve means (37) for controlling communication between said fluid pressure chambers (12, 13), a valve actuating means (20, 23) capable of actuating both said first and second valve means (36, 37) in accordance with manual operation of a brake pedal (2), means (41, 50) for supplying fluid at an adjustable pressure in order to move said output rod (28) without movement of said valve actuating means (20,23) and a booster converter (44) allowing said valve actuating means (20) to open and close said first valve means (36) and close and open said second valve means (37) respectively as the brake pedal (2) is depressed and released in one mode of operation of the brake booster, whereby atmospheric air is supplied to the second fluid pressure chamber (13) through said first valve means (36), characterized in that there are further provided a first means (1) for sensing a depression force applied to the brake pedal (2) by an operator, said first sensing means (1) outputting a corresponding depression force signal, and a second means (3) for sensing the rate of deceleration of the vehicle due to braking, said second sensing means (3) outputting a corresponding actual deceleration signal, that said means (41, 50) for supplying fluid at an adjustable pressure supplies same to the second fluid pressure chamber (13), the pressure of the fluid being adjusted in response to the depression force signal and the actual deceleration signal, and that said booster converter (44) continuously holding both of said valve means (36, 37) closed regardless of the valve actuating means (20, 23) in another mode of operation of the brake booster.
Claim 2
Dependent Claim
365 words
A brake booster for augmenting the force applied to a brake of a vehicle comprising: an airtight housing (11), a pressure-differential responsive movable wall (14) dividing the interior of said housing (11) into first (12) and second (13) fluid pressure chambers, said first chamber (12) being held at an essentially constant pressure, an output rod (28) fixed to said movable wall (14) for applying force to the brake of the vehicle in accordance with its movement, a first valve means (36) for controlling communication between said second fluid pressure chamber (13) and atmosphere, a second valve means (37) for controlling communication between said fluid pressure chambers (12, 13), a valve actuating means (20, 23) capable of actuating both said first and second valve means (36, 37) in accordance with manual operation of a brake pedal (2), means (41, 50) for supplying fluid at an adjustable pressure in order to move said output rod (28) without movement of said valve actuating means (20,23) and a booster converter (44) allowing said valve actuating means (20) to open and close said first valve means (36) and close and open said second valve means (37) respectively as the brake pedal (2) is depressed and released in one mode of operation of the brake booster, whereby atmospheric air is supplied to the second fluid pressure chamber (13) through said first valve means (36), characterized in that there are further provided a first means (1) for sensing a depression force applied to the brake pedal (2) by an operator, said first sensing means (1) outputting a corresponding depression force signal, and a second means (3) for sensing the rate of deceleration of the vehicle due to braking, said second sensing means (3) outputting a corresponding actual deceleration signal, that said means (41, 50) for supplying fluid at an adjustable pressure supplies same to the second fluid pressure chamber (13), the pressure of the fluid being adjusted in response to the depression force signal and the actual deceleration signal, and that said booster converter (44) continuously holding both of said valve means (36, 37) closed regardless of the valve actuating means (20, 23) in another mode of operation of the brake booster.
Claim 3
Dependent Claim
30 words
A brake booster as defined in claim 1, wherein said booster converter (44) includes a movable booster converter body (33) and actuating means (45) for the booster converter body (33).
Claim 4
Dependent Claim
19 words
A brake booster as defined in claim 2, wherein the booster converter body actuating means (45) is a solenoid.
Claim 5
Dependent Claim
22 words
A brake booster as defined in claim 2, wherein the booster converter body (33) is in the form of a cylindrical sleeve.
Claim 6
Dependent Claim
23 words
A brake booster as defined in claim 4, wherein the booster converter body (33) is disposed within said pressure-differential responsive movable wall (14).
Claim 7
Dependent Claim
58 words
A brake booster as defined in claim 5, wherein said valve actuating means (20, 23) includes a valve plunger (23) surrounded by the booster converter body (33) and abutting said pressure-differential responsive movable wall (14), and an input rod (20) joined to and transmitting the force of depression of the brake pedal (2) to the valve plunger (23).
Claim 8
Dependent Claim
47 words
A brake booster as defined in claim 6, wherein both said valve means (36, 37) include a common valve closure member (29) cooperating with an edge of the booster converter body (33), an edge of the valve plunger (23) and a section of the input rod (20).
Claim 9
Dependent Claim
44 words
A brake booster as defined in claim 1, wherein said fluid pressure supply means (50) includes an electro-mechanical valve (51) supplying fluid at a desired pressure to the second fluid pressure chamber (13) in response to the manual operation of the brake pedal (2).
Claim 10
Dependent Claim
20 words
A brake booster as defined in claim 8, wherein the electro-mechanical valve (51) supplies atmospheric air as the pressurized fluid.
Claim 11
Dependent Claim
59 words
A brake booster as defined in claim 3, wherein said fluid pressure supplying means (50) includes a control unit (52) containing a solenoid-control circuit which, when receiving a trouble signal indicating malfunction of said fluid pressure supply means (50), outputs a signal controlling the solenoid such that the booster converter (44) is switched to its other mode of operation.
References Cited (Backward Citations)
EP0136689A2
Cited
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