GB837576A - Improvements in or relating to fluid-pressure operated braking apparatus for vehicles - Google Patents

Improvements in or relating to fluid-pressure operated braking apparatus for vehicles

Info

Publication number
GB837576A
GB837576A GB3837457A GB3837457A GB837576A GB 837576 A GB837576 A GB 837576A GB 3837457 A GB3837457 A GB 3837457A GB 3837457 A GB3837457 A GB 3837457A GB 837576 A GB837576 A GB 837576A
Authority
GB
United Kingdom
Prior art keywords
piston
cylinder
pressure
valve
fluid
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
Application number
GB3837457A
Inventor
Donald Henry Ballard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wabco Automotive UK Ltd
Original Assignee
Clayton Dewandre Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Clayton Dewandre Co Ltd filed Critical Clayton Dewandre Co Ltd
Priority to GB3837457A priority Critical patent/GB837576A/en
Publication of GB837576A publication Critical patent/GB837576A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T13/00Transmitting 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
    • B60T13/10Transmitting 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
    • B60T13/24Transmitting 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
    • B60T13/241Differential pressure systems
    • B60T13/242The control valve is provided as one unit with the servomotor cylinder
    • B60T13/245Hydraulic command of the control valve, hydraulic transmission to the brake
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T11/00Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16Master control, e.g. master cylinders
    • B60T11/224Master control, e.g. master cylinders with pressure-varying means, e.g. with two stage operation provided by use of different piston diameters including continuous variation from one diameter to another

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

837,576. Fluid-pressure brakes. CLAYTON DEWANDRE CO. Ltd. Dec. 1, 1958 [Dec. 10, 1957; Jan. 14, 1958], Nos. 38374/57 and 1330/58. Class 103 (1). A fluid pressure-operated servo-assisted braking apparatus of the type disclosed in Specification 550,540, comprises two independent hydraulic systems for operating separate brakes and each embodying an auxiliary cylinder 11, 12, combined into a unit or mounted for common actuation by servomotor 1, 2, and a pedal operated dual transmitter 25 incorporating two master cylinders connected, respectively, by lines 26, 27 to auxiliary cylinders 11, 12, the pressures in lines 26, 27 being each transmitted to the hydraulic motor 33, 34 for actuating the control valve 5, so that a degree of braking control is retained irrespective of failure in either system. Actuation of transmitter 25, comprising two parallel or in-line master cylinders, creates pressure in chambers 28, 29 to advance pistons 13, 19 to actuate both sets of brakes. The pressure also acts via passages 45, 44 and 46, in chambers 41, 36 of valve 5, the pressure on piston 33 being balanced to maintain the piston in the shown position whilst piston 34 is moved to operate valve 5 to admit air through pipe 4 to the rear of the vacuum suspended piston 2 which moves piston 13 through rod 14 to boost pressure in cylinder 11, which pressure is transmitted to cylinder 12 by floating piston 15, rod 20 and piston 19. Should a leak occur on the output side of cylinder 11, then pressure in line 26 passes through piston 13 via ball valve 13a, the piston remaining stationary; pressure in lines 27, 45 operates cylinder 12 and valve 5 to actuate motor 1, 2 which displaces piston 13 until it abuts piston 15 to transmit the output of motor 1, 2 mechanically to cylinder 12. Should a leak occur on the output side of cylinder 10, then piston 13 will be operated but no pressure created in cylinder 11 due to yielding of piston 15 because of absence of pressure in cylinder 12, fluid in front of piston 15 escaping through passage 47 and lines 48 and 26; when piston 15 abuts the end of cylinder 11 the piston 13 operates normally. The pressure in chamber 36 actuates piston 34 through piston 33 and spacer 40 to actuate valve 5. Should a leak occur on the input side of either cylinder 11 or 12 then the other cylinder and system is operated as above. Movement of piston 13 is transmitted to piston 15 by liquid pressure in cylinder 11 but in the first Provisional Specification this movement is transmitted by a rod and lostmotion connection between the pistons 13, 15.
GB3837457A 1957-12-10 1957-12-10 Improvements in or relating to fluid-pressure operated braking apparatus for vehicles Expired GB837576A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3837457A GB837576A (en) 1957-12-10 1957-12-10 Improvements in or relating to fluid-pressure operated braking apparatus for vehicles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3837457A GB837576A (en) 1957-12-10 1957-12-10 Improvements in or relating to fluid-pressure operated braking apparatus for vehicles

Publications (1)

Publication Number Publication Date
GB837576A true GB837576A (en) 1960-06-15

Family

ID=10403059

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3837457A Expired GB837576A (en) 1957-12-10 1957-12-10 Improvements in or relating to fluid-pressure operated braking apparatus for vehicles

Country Status (1)

Country Link
GB (1) GB837576A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3173261A (en) * 1961-03-08 1965-03-16 Automotive Prod Co Ltd Fluid pressure braking systems
US3196618A (en) * 1963-03-22 1965-07-27 Dewandre Co Ltd C Fluid pressure-operated braking apparatus
DE1238790B (en) * 1962-12-24 1967-04-13 Teves Kg Alfred Dual circuit brake system for motor vehicles
DE1269514B (en) * 1961-03-08 1968-05-30 Automotive Prod Co Ltd Pressure fluid brake system for vehicles, especially motor vehicles
DE1292525B (en) * 1960-06-24 1969-04-10 Magneti Marelli Spa Air brake system
FR2631914A1 (en) * 1988-05-31 1989-12-01 Bendix France BRAKE ASSIST DEVICE

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1292525B (en) * 1960-06-24 1969-04-10 Magneti Marelli Spa Air brake system
US3173261A (en) * 1961-03-08 1965-03-16 Automotive Prod Co Ltd Fluid pressure braking systems
DE1269514B (en) * 1961-03-08 1968-05-30 Automotive Prod Co Ltd Pressure fluid brake system for vehicles, especially motor vehicles
DE1238790B (en) * 1962-12-24 1967-04-13 Teves Kg Alfred Dual circuit brake system for motor vehicles
US3196618A (en) * 1963-03-22 1965-07-27 Dewandre Co Ltd C Fluid pressure-operated braking apparatus
FR2631914A1 (en) * 1988-05-31 1989-12-01 Bendix France BRAKE ASSIST DEVICE

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