GB1443968A - Trailer vehicle brake control valve units - Google Patents
Trailer vehicle brake control valve unitsInfo
- Publication number
- GB1443968A GB1443968A GB4880773A GB4880773A GB1443968A GB 1443968 A GB1443968 A GB 1443968A GB 4880773 A GB4880773 A GB 4880773A GB 4880773 A GB4880773 A GB 4880773A GB 1443968 A GB1443968 A GB 1443968A
- Authority
- GB
- United Kingdom
- Prior art keywords
- brake
- piston
- pressure
- chamber
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/26—Compressed-air systems
- B60T13/261—Compressed-air systems systems with both indirect application and application by springs or weights and released by compressed air
- B60T13/263—Compressed-air systems systems with both indirect application and application by springs or weights and released by compressed air specially adapted for coupling with dependent systems, e.g. tractor-trailer systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/18—Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere
- B60T15/24—Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere controlled by three fluid pressures
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Braking Systems And Boosters (AREA)
Abstract
1443968 Trailer brake relay valve assembly ROBERT BOSCH GmbH 19 Oct 1973 [20 Oct 1972] 48807/73 Heading F2F A trailer vehicle brake control valve unit is operable to control the pressure in a trailer brake line 26 in dependence upon the brake pressure in at least one of two tractor brake lines 5, 10 or in dependence upon the pressure in a spring-loaded brake-operating mechanism circuit. The valve unit comprises two brake pistons 2, 3, a brake pressure chamber 6 above the piston 2 being connected to brake line 5 and a brake pressure chamber 11 located between the pistons 2, 3 being connected to brake line 10. An atmospheric air chamber 15 is located on the other side of piston 3 and within chamber 15 is arranged a stressed spring element comprising springs 17 acting on the outer piston part 20 of a two-part retroactive piston 20, 21. Inner piston part 21 which is acted upon by a spring 22 is mechanically connected to piston 3 by axial extensions 19. The piston 20, 21 forms the movable wall of a pressure charge chamber 27 connected to the trailer brake line 26 and a fixed wall 28 of the chamber 27 carries an inlet valve seat 29 of a double-seat valve 29, 30, 31 whose outlet valve seat 30 is formed on the piston part 21. The valve closure member 31 of the double seat valve 29, 30, 31 has a sealing lip 31<SP>1</SP> by means of which the closure member 31 slides on a tubular member 32. The tubular member 32 has at least one radial opening 37 for connecting the chamber 27 to atmosphere; the tubular member 32 has a flange 33 by means of which it can act upon the piston part 21, and the tubular member 32 carries a piston member 34 one side of which is subjected to the supply pressure of air supplied to a chamber 35 and the other side of which is subjected to the pressure of air in a chamber 36 connected to the spring-loaded brake operating mechanism circuit. In use, pressurization of one or both brake lines 5, 10 causes piston 3 to move (with or without piston 2) and via axial extensions 19 the piston part 21 is moved to close outlet valve 30, 31 to cut off communication between the atmospheric air and the trailer brake line 26, and thereafter open inlet valve 29, 31 to connect chamber 27 to chamber 35 to cause compressed air to flow to trailer brake line 26. The pressure in the trailer brake increases steeply relative to the increase in pressure in the tractor brake until the brake piston 3 abuts an annular shoulder 23 on the outer piston part 20 whereafter the piston 20, 21 acts as though it were one piece and the lead of the trailer brake pressure is terminated. In response to a drop in pressure in the spring- brake operating mechanism as caused by a defect or deliberately by a parking brake valve or auxiliary brake valve the piston 34 and tubular member 32 move downwardly; the flange 33 pulls piston part 21 downwardly to change over the double seat valve 29, 30, 31. The reactive effect upon the piston member 34 is effected solely by the inner piston part 21: this reduces the lead of the trailer brake pressure.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19722251479 DE2251479C2 (en) | 1972-10-20 | 1972-10-20 | Trailer control valve for dual-circuit air brake systems in road vehicles |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1443968A true GB1443968A (en) | 1976-07-28 |
Family
ID=5859578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4880773A Expired GB1443968A (en) | 1972-10-20 | 1973-10-19 | Trailer vehicle brake control valve units |
Country Status (5)
Country | Link |
---|---|
AT (1) | AT338124B (en) |
BR (1) | BR7308107D0 (en) |
DE (1) | DE2251479C2 (en) |
GB (1) | GB1443968A (en) |
SE (1) | SE402566B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2615893A1 (en) * | 1974-04-24 | 1977-10-20 | Bosch Gmbh Robert | Pneumatic valve for trailer brakes - has failsafe interlock to apply brakes when line to trailer is cut |
DE3308082A1 (en) * | 1983-03-08 | 1984-09-20 | Robert Bosch Gmbh, 7000 Stuttgart | Trailer control valve |
DE3925292A1 (en) * | 1989-07-31 | 1991-02-07 | Grau Gmbh | OVER TWO CIRCUITABLE RELAY VALVE, IN PARTICULAR TRAILER CONTROL OR TRAILER BRAKE VALVE, FOR AIR BRAKE SYSTEMS ON MOTOR VEHICLES |
DE3929936A1 (en) * | 1989-09-08 | 1991-03-21 | Grau Gmbh | Twin circuit relay valve for a pneumatic brake system - use of a reaction piston to divide the braking chamber |
DE102016114831A1 (en) | 2016-08-10 | 2018-02-15 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Multiple relay valve and pneumatic brake system with at least one multiple relay valve |
WO2019234475A1 (en) * | 2018-06-07 | 2019-12-12 | Wabco India Limited | Air brake control valve |
CN114401875A (en) * | 2019-10-14 | 2022-04-26 | 威伯科印度有限公司 | Trailer control valve with leakage protection function for vehicle brake system |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1958042A1 (en) * | 1969-11-19 | 1971-05-27 | Bosch Gmbh Robert | Multipurpose trailer brake valve |
-
1972
- 1972-10-20 DE DE19722251479 patent/DE2251479C2/en not_active Expired
-
1973
- 1973-10-08 AT AT853673A patent/AT338124B/en not_active IP Right Cessation
- 1973-10-17 BR BR810773A patent/BR7308107D0/en unknown
- 1973-10-18 SE SE7314182A patent/SE402566B/en unknown
- 1973-10-19 GB GB4880773A patent/GB1443968A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
AT338124B (en) | 1977-07-25 |
SE402566B (en) | 1978-07-10 |
DE2251479A1 (en) | 1974-05-02 |
DE2251479C2 (en) | 1982-01-28 |
ATA853673A (en) | 1976-11-15 |
BR7308107D0 (en) | 1974-07-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
746 | Register noted 'licences of right' (sect. 46/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |