Patent US3926480A successfully refreshed from Google Patents.
US3926480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-skid brake control system for vehicles
Assignee: Aisin Corp
•
Filing: 1974-12-23
•
Granted: 1975-12-16
•
Expires: 1994-12-23
Abstract
Abstract An anti-skid brake control system includes an actuator device having cut-off valve means provided in braking circuits between a master cylinder and wheel brake cylinders. A normally closed leak oil flow-preventing valve assembly is disposed between a reservoir and a spool valve type control device for controlling the hydraulic pressure applied to the actuator device. By said valve assembly, the pressure oil leaked from the control valve device during non-braking operation is prevented from flowing into the reservoir. During a braking operation, the leak oil flow-preventing valve assembly is opened due to the booster pressure or the braking pressure transmitted from the master cylinder. As a result, communication between the control valve device and the reservoir is rendered effective.
Inventors
- 👤 Juichi Shibatani
- 👤 Toshiyuki Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:55
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4208; B60T8/4225; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T13/143; B60T13/144; B60T8/341; B60T8/343; B60T8/344; B60T8/345; B60T8/36; B60T8/3615; B60T8/3675
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
309 words
An anti-skid brake control system for vehicles comprising: a. a master cylinder for generating a hydraulic brake pressure; b. wheel brake cylinders; c. a hydraulic braking circuit connecting said master cylinder to said wheel cylinders, for supplying, during a braking operation, the hydraulic brake pressure from said master cylinder into said wheel cylinder; d. cut-off valve means disposed in said hydraulic braking circuit and interposed between said master cylinder and said wheel cylinders to control the hydraulic communication therebetween; e. a hydraulic brake pressure reducing means disposed in said hydraulic braking circuit and interposed between said cut-off valve means and said wheel cylinders and cooperatively connected to said cut-off valve means; f. a pump-powered hydraulic pressuRe source; g. a reservoir hydraulically connected to said pump-powered hydraulic pressure source; h. means for generating a skid sensing signal; i. a first hydraulic line for permitting said pump-powered hydraulic pressure source to hydraulically communicate with said hydraulic brake pressure reducing means; j. a control valve assembly disposed in said first hydraulic line, for controlling the hydraulic communication between said pump-powered hydraulic pressure source and said hydraulic brake pressure reducing means in response to said skid sensing signal; k. a second hydraulic line for permitting said control valve assembly to hydraulically communicate with said reservoir; and l. a leak oil flow-preventing valve assembly disposed in said second hydraulic line and hydraulically operated, in accordance with the condition of the braking operation, to open said second hydraulic line so as to render effective the hydraulic communication between said control valve assembly and said reservoir only during the braking operation and to close said second hydraulic line during the non-braking operation; wherein, during the non-braking operation, a leak oil flowing into said second hydraulic line from said control valve assembly is prevented by said leak oil flow-preventing valve assembly from flowing further into said reservoir.
Claim 2
Dependent Claim
309 words
An anti-skid brake control system for vehicles comprising: a. a master cylinder for generating a hydraulic brake pressure; b. wheel brake cylinders; c. a hydraulic braking circuit connecting said master cylinder to said wheel cylinders, for supplying, during a braking operation, the hydraulic brake pressure from said master cylinder into said wheel cylinder; d. cut-off valve means disposed in said hydraulic braking circuit and interposed between said master cylinder and said wheel cylinders to control the hydraulic communication therebetween; e. a hydraulic brake pressure reducing means disposed in said hydraulic braking circuit and interposed between said cut-off valve means and said wheel cylinders and cooperatively connected to said cut-off valve means; f. a pump-powered hydraulic pressuRe source; g. a reservoir hydraulically connected to said pump-powered hydraulic pressure source; h. means for generating a skid sensing signal; i. a first hydraulic line for permitting said pump-powered hydraulic pressure source to hydraulically communicate with said hydraulic brake pressure reducing means; j. a control valve assembly disposed in said first hydraulic line, for controlling the hydraulic communication between said pump-powered hydraulic pressure source and said hydraulic brake pressure reducing means in response to said skid sensing signal; k. a second hydraulic line for permitting said control valve assembly to hydraulically communicate with said reservoir; and l. a leak oil flow-preventing valve assembly disposed in said second hydraulic line and hydraulically operated, in accordance with the condition of the braking operation, to open said second hydraulic line so as to render effective the hydraulic communication between said control valve assembly and said reservoir only during the braking operation and to close said second hydraulic line during the non-braking operation; wherein, during the non-braking operation, a leak oil flowing into said second hydraulic line from said control valve assembly is prevented by said leak oil flow-preventing valve assembly from flowing further into said reservoir.
Claim 3
Dependent Claim
123 words
An anti-skid brake control system for vehicles according to claim 1, wherein said leak oil flow-preventing valve assembly includes a housing having first and second ports formed therein, said first port connecting to said control valve assembly through said second hydraulic line, said second port connecting to said reservoir through said second hydraulic line, a valve member disposed in said second hydraulic line and interposed between said first and second ports of said housing, a piston slidably disposed within said housing, and a sealing member for preventing occurrence of hydraulic oil leakage at the interspace between said piston and said housing, whereby, during the braking operation said piston is caused to slide to permit said valve member to open said second hydraulic line.
Claim 4
Dependent Claim
141 words
An anti-skid brake control system for vehicles according to claim 2, wherein said valve member has a through hole and a conical valve seat formed at one opening end of said through hole; a spring biased valve ball in engagement with said valve seat is disposed within said housing; said piston has a small diameter projecting portion and an actuating portion which is adjacent to and larger in diameter than said small diameter projecting portion, said projecting portion being loosely inserted into said through hole of said valve member, whereby when the piston sliding is effected in accordance with the braking operation, said projecting portion first permits said valve ball to be disengaged from said conical valve seat and then a shoulder portion of said actuating portion is permitted to engage with said valve member, thereby to actuate said valve member.
Claim 5
Dependent Claim
45 words
An anti-skid brake control system for vehicles according to claim 1, wherein, during the braking operation, said leak oil flow-preventing valve assembly is supplied with a hydraulic brake pressure from said master cylinder to operate said valve assembly thereby to open said second hydraulic line.
Claim 6
Dependent Claim
52 words
An anti-skid brake control system for vehicles according to claim 2, wherein a sealing member is provided between said piston and said housing in a manner spaced from said sealing member; and an oil discharge aperture opened to the exterior is formed in that portion of said housing between said sealing members.
Claim 7
Dependent Claim
36 words
An anti-skid brake control system for vehicles according to claim 1, further comprising a hydraulic booster connected to said master cylinder, and another pump-powered hydraulic pressure source for supplying a hydraulic booster pressure into said booster.
Claim 8
Dependent Claim
73 words
An anti-skid brake control system for vehicles according to claim 6, wherein said hydraulic booster includes an Outlet port and valve means for generating the hydraulic booster pressure into said outlet only during the braking operation; the hydraulic booster pressure generated into said outlet of said booster is supplied into said leak oil flow-preventing valve assembly to operate the leak oil flow-preventing valve assembly, thereby permitting said second hydraulic line to be opened.
Claim 9
Dependent Claim
30 words
An anti-skid brake control system for vehicles according to claim 1, wherein said control valve assembly includes an electro-magnetic valve means electrically connected to said skid sensing signal generating means.
Claim 10
Dependent Claim
68 words
An anti-skid brake control system for vehicles according to claim 8, wherein said control valve assembly further includes orifice valve means disposed in said first hydraulic line between said electro-magnetic valve means and said hydraulic brake pressure reducing means, for controlling the flow speed of a hydraulic oil flowing through said first hydraulic line, said orifice valve means being electrically connected to said skid sensing signal generating means.
Claim 11
Dependent Claim
65 words
An anti-skid brake control system for vehicles according to claim 1, further comprising hydraulic pressure lock valve means disposed in said first hydraulic line between said hydraulic pressure reducing means and said control valve assembly, and lock valve actuating means hydraulically connected to said pump-powered hydraulic pressure source and operated to open said lock valve means in accordance with the hydraulic pressure from said source.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |