Patent US4694428A successfully refreshed from Google Patents.
Patent EP0280740A1 successfully refreshed from Google Patents.
EP0280740A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Braking pressure control system
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1987-08-27
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Granted: —
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Expires: 2007-08-27
Abstract
Abstract A braking pressure control unit having discharge valves (15,16) which are provided with valve means for opening and closing a passage (14) into which a control fluid pressure from a control chamber Is discharged and which are set in the discharge passage (14), the pressure of the control fluid in the control chamber being reduced by opening the discharge valves to thereby directly or indirectly reduce the vehicle braking force, characterized In that the means for opening and closing the discharge valves (15,16) consist of at least two means connected in series to the discharge passage, whereby, even when either one of these valve opening and closing means has lost from certain causes its functions of shutting off the discharge passage (14), the remaining normal valve opening and closing means is operated to prevent the leakage of the control fluid pressure from the control chamber.
Inventors
- 👤 Teruhisa Itami Works Of Sumi.Elec.Ind. Ltd. Kohno
- 👤 Koichi Itami Works Of Sumi.Elec.Ind. Ltd. Hashida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 15:01
CPC Classifications
B; B60; B60T; B60T17/00; B60T8/00; B60T8/32; B60T8/34; B60T8/343; B60T8/344; B60T8/348; B60T8/36; B60T8/3615; B60T8/363; B60T8/3635; B60T8/365; B60T8/40; B60T8/4072; B60T8/44; B60T8/445; B60T8/46; B60T8/88
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
A brake pressure control system including a discharge valve provided in a discharge line for control fluid fed from a control chamber and having an on-off valve means for opening and closing the discharge line, the opening of said discharge valve lowering the control fluid pressure in the control chamber to reduce the braking force directly or indirectly, characterized in that two or more valve means of said discharge valves are provided in series in said discharge line.
Claim 2
Dependent Claim
78 words
A brake pressure control system including a discharge valve provided in a discharge line for control fluid fed from a control chamber and having an on-off valve means for opening and closing the discharge line, the opening of said discharge valve lowering the control fluid pressure in the control chamber to reduce the braking force directly or indirectly, characterized in that two or more valve means of said discharge valves are provided in series in said discharge line.
Claim 3
Dependent Claim
35 words
The brake pressure control system as claimed in claim 1, wherein each of said two or more on-off valve means is provided in said each discharge valve which is electromagnetically operated independently of each other.
Claim 4
Dependent Claim
144 words
The brake pressure control system as claimed in claim 2, wherein said discharge valves are provided in two, each being provided with one said on-off valve means, one of said discharge valves located farther from said control chamber comprising a fixed iron core, an electromagnetic coil wound around said iron core, a movable valve body as said on-off valve means adapted to be attracted by said iron core against the fluid flow to open the discharge line, and a spring for biasing said valve body in the direction of the fluid flow to close said discharge valve, said iron core being adapted to attract said movable body with a force which is smaller than the sum of the fluid pressure before starting control and the bias of said spring, which act as a valve-closing force, but is greater than the bias of said spring.
Claim 5
Dependent Claim
98 words
The brake pressure control system as claimed in claim 1, wherein said discharge valve comprises a fixed iron core, an electromagnetic coil wound around said iron core, a first movable valve body as a first on-off valve means adapted to be attracted by said iron core to open the discharge line, a second movable valve body as a second on-off valve means adapted to follow the movement of said first movable valve body to open a passage formed through said iron core, and springs adapted to bias said first and second movable bodies separately in the valve-closing directions.
Claim 6
Dependent Claim
101 words
The brake pressure control system as claimed in claim 1, wherein said discharge valve comprises a fixed iron core, an electromagnetic coil wound around said iron core, a first movable valve body as a first on-off valve means, a second movable valve body as a second on-off valve means, and springs each biasing said first and second movable valve bodies in the valve-closing directions, said first and second movable valve bodies being provided at opposite ends of said iron core with their positions opposite to each other and adapted to be attracted toward said iron core to open the discharge line.
Claim 7
Dependent Claim
103 words
The brake pressure control system as claimed in claim 5 , wherein said first and second movable valve bodies are moved in opposite directions to each other to close said discharge valve, one of said movable valve bodies being moved in the direction of the fluid flow to close said discharge valve, said iron core being adapted to attract said one of the movable valve bodies with a force which is smaller than the sum of the fluid pressure before starting control and the bias of said spring, which act as a valve-closing force, but is greater than the bias of said spring.
Claim 8
Dependent Claim
73 words
The brake pressure control system as claimed in claim 1 or 2, wherein one of said on-off valve means located at the farthest point from said control chamber is housed in an electromagnetic fluid pressure control valve provided separately from said discharge valve, said on-off valve means having a movable valve body adapted to be moved to the valve-opening position by the attraction force generated by an electromagnetic coil in said control valve.
Claim 9
Dependent Claim
83 words
8 . The brake pressure control system as claimed in claim 7 , wherein said movable valve body of said on-off valve means is biased in the direction of the fluid flow by a spring, said electromagnetic coil being adapted to attract said movable valve body with a force which is smaller than the sum of the fluid pressure before starting control and the bias of said spring, which act as a valve-closing force, but is greater than the bias of said spring.
Claim 10
Dependent Claim
35 words
The brake pressure control system as claimed in claim 7 or 8, wherein said fluid pressure control valve is an input valve for controlling the inflow rate of the pressurized fluid into said control chamber.
Claim 11
Dependent Claim
69 words
The brake pressure control system as claimed in claim 1 or 2, where,in a plurality of said control chambers are provided, each having a discharge line, said discharge lines being brought together at a junction point, some of said on-off valve means are provided in discharge lines extending from said control chambers to a junction point and the other are in a discharge line downstream of said junction point.
References Cited (Backward Citations)
No citation records indexed.
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