US3910645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-lock brake system including a center brake control booster device and a wheel master cylinder assembly
Assignee: Nissan Motor Co Ltd
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Filing: 1974-02-28
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Granted: 1975-10-07
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Expires: 1994-02-28
Abstract
Abstract An anti-lock brake system includes a center hydraulically boosted master cylinder for hydraulical actuation of wheel master cylinder associated with a wheel brake, a center brake control valve assembly functioning to channel pump generated fluid pressure to a booster of a center master cylinder for actuation thereof and including an operator actuating assembly functioning to dampen the reaction force to an operator pedal during antilock control operation and permit booster actuation in the event of the loss of pump generated fluid pressure, an hydraulically actuated return piston for return actuation of the wheel master cylinder to relieve brake pressure to the wheel brake, and an anti-lock control valve functioning to cyclically apply and release fluid pressure to the hydraulically actuated return piston for actuation thereof during anti-lock control operation.
Inventors
- 👤 Yasuhisa Takeuchi
- 👤 Haruhiko Iizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:57
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/44; B60T8/447
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
347 words
In a motor vehicle having a fluid pressure operated wheel brake, a pump providing a source of fluid flow and pressure, a wheel master cylinder having a wheel master cylinder piston and a return spring, the wheel master cylinder being fluidly connected to the wheel brake, a center master cylinder fluidly connected to the wheel master cylinder, a fluid pressure operated booster associated with the center master cylinder for actuation thereof, the booster having a booster piston and a power chamber and a reservoir, the combination comprising: a housing forming the power chamber and having an inlet port communicating operating fluid from the pump and an outlet port in communication with the reservoir; a spool having a passage therein communicating with the power chamber and having axially spaced lands slidingly engaging the housing, the lands and the ports being so constructed and arranged as to provide unrestricted communication between the passage and the outlet port when the spool is in its rest position, whereby the pressure in the power chamber is substantially zero; means including the pressure of operating fluid in the power chamber and a biasing spring for biasing the spool to the rest position thereof; operator actuable means adapted to progressively move the spool relative to the housing to restrict fluid communication of the passage with the reservoir thereby providing operating fluid pressure to the power chamber; spring means disposed between the spool and the operator actuable means for damping excessive movement between the operator actuable means and the spool; means associated with the wheel master cylinder for actuation thereof, forming a chamber and including a piston connected to the wheel master cylinder piston for assisting movement of the wheel master cylinder by the return spring in response to the pressure in the wheel master cylinder chamber; conduit means connecting the power chamber, the chamber and the reservoir; and anti-lock valve means in the conduit means intermediate the power chamber and the wheel master cylinder chamber and said anti-lock valve means being adapted to selectively apply and release the operating fluid pressure to the chamber.
Claim 2
Dependent Claim
347 words
In a motor vehicle having a fluid pressure operated wheel brake, a pump providing a source of fluid flow and pressure, a wheel master cylinder having a wheel master cylinder piston and a return spring, the wheel master cylinder being fluidly connected to the wheel brake, a center master cylinder fluidly connected to the wheel master cylinder, a fluid pressure operated booster associated with the center master cylinder for actuation thereof, the booster having a booster piston and a power chamber and a reservoir, the combination comprising: a housing forming the power chamber and having an inlet port communicating operating fluid from the pump and an outlet port in communication with the reservoir; a spool having a passage therein communicating with the power chamber and having axially spaced lands slidingly engaging the housing, the lands and the ports being so constructed and arranged as to provide unrestricted communication between the passage and the outlet port when the spool is in its rest position, whereby the pressure in the power chamber is substantially zero; means including the pressure of operating fluid in the power chamber and a biasing spring for biasing the spool to the rest position thereof; operator actuable means adapted to progressively move the spool relative to the housing to restrict fluid communication of the passage with the reservoir thereby providing operating fluid pressure to the power chamber; spring means disposed between the spool and the operator actuable means for damping excessive movement between the operator actuable means and the spool; means associated with the wheel master cylinder for actuation thereof, forming a chamber and including a piston connected to the wheel master cylinder piston for assisting movement of the wheel master cylinder by the return spring in response to the pressure in the wheel master cylinder chamber; conduit means connecting the power chamber, the chamber and the reservoir; and anti-lock valve means in the conduit means intermediate the power chamber and the wheel master cylinder chamber and said anti-lock valve means being adapted to selectively apply and release the operating fluid pressure to the chamber.
Claim 3
Dependent Claim
23 words
The combinatIon as claimed in claim 1, wherein the piston of the assisting means is larger in effective surface than the booster piston.
Claim 4
Dependent Claim
45 words
The combination as claimed in claim 2, wherein the spool, the operator actuable means, and the booster piston are so constructed and arranged as to effect simultaneous movement of the operator actuable means, the spool and the booster piston upon failure of operating fluid supply.
Claim 5
Dependent Claim
38 words
The combination as claimed in claim 2, wherein the operator actuable means includes a reaction piston slidingly engaging the housing and spaced from the spool, and the spring means is disposed between the spool and the reaction piston.
Claim 6
Dependent Claim
20 words
The combination as claimed in claim 4, wherein the biasing spring is disposed between the booster piston and the spool.
Claim 7
Dependent Claim
60 words
The combination as claimed in claim 1, wherein the lands and the port are so constructed and arranged as to block communication between the passage and the inlet port when the spool is in the initial position thereof and the operator actuable means adapted to progressively move the spool to permit fluid communication of the passage with the inlet port.
Claim 8
Dependent Claim
36 words
The combination as claimed in claim 1, wherein the lands and the ports are so constructed and arranged as to permit unrestricted communication between the passage and the inlet port irrespective of position of the spool.
Claim 9
Dependent Claim
220 words
In a motor vehicle having a fluid pressure operated wheel brake; a pump providing a source of fluid flow and pressure, an operator actuable wheel master cylinder having a wheel master cylinder piston and a return spring, the wheel master cylinder being fluidly connected to the wheel brake, and a reservoir, the combination comprising: means associated with the wheel master cylinder for actuation thereof, forming a chamber in communication with the fluid reservoir and including a piston connected to the wheel master cylinder piston for assisting movement by the return spring of the wheel master cylinder piston in response to the pressure in the chamber; conduit means communicating operating fluid from the pump and the chamber of the assisting means; open valve means including a movable valve member and a stationary valve seat and communicating the operating fluid from the pump means to a fluid reservoir when in its open position; anti-lock valve means in the conduit means fluidly intermediate between the open valve means and the assisting means and adapted to apply and release the operating fluid pressure to the chamber of the assisting means; and operator actuable means adapted to progressively move the valve member relative to the valve seat member to restrict fluid communication with the reservoir thereby providing operating fluid pressure to the anti-lock valve means.
Claim 10
Dependent Claim
220 words
In a motor vehicle having a fluid pressure operated wheel brake; a pump providing a source of fluid flow and pressure, an operator actuable wheel master cylinder having a wheel master cylinder piston and a return spring, the wheel master cylinder being fluidly connected to the wheel brake, and a reservoir, the combination comprising: means associated with the wheel master cylinder for actuation thereof, forming a chamber in communication with the fluid reservoir and including a piston connected to the wheel master cylinder piston for assisting movement by the return spring of the wheel master cylinder piston in response to the pressure in the chamber; conduit means communicating operating fluid from the pump and the chamber of the assisting means; open valve means including a movable valve member and a stationary valve seat and communicating the operating fluid from the pump means to a fluid reservoir when in its open position; anti-lock valve means in the conduit means fluidly intermediate between the open valve means and the assisting means and adapted to apply and release the operating fluid pressure to the chamber of the assisting means; and operator actuable means adapted to progressively move the valve member relative to the valve seat member to restrict fluid communication with the reservoir thereby providing operating fluid pressure to the anti-lock valve means.
References Cited (Backward Citations)
US3767271A
Cited
US3659905A
Cited
US3738712A
Cited
US3731980A
Cited
US3729235A
Cited
US3830549A
Cited
US3815961A
Cited
US3747987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |