GB890629A - Improvements in or relating to servo-assisted brake-operating mechanisms - Google Patents

Improvements in or relating to servo-assisted brake-operating mechanisms

Info

Publication number
GB890629A
GB890629A GB814057A GB814057A GB890629A GB 890629 A GB890629 A GB 890629A GB 814057 A GB814057 A GB 814057A GB 814057 A GB814057 A GB 814057A GB 890629 A GB890629 A GB 890629A
Authority
GB
United Kingdom
Prior art keywords
cylinder
servo
end wall
vacuum
piston
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
GB814057A
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
Priority to BE565646D priority Critical patent/BE565646A/xx
Application filed by Clayton Dewandre Co Ltd filed Critical Clayton Dewandre Co Ltd
Priority to GB814057A priority patent/GB890629A/en
Publication of GB890629A publication Critical patent/GB890629A/en
Expired legal-status Critical Current

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
    • B60T13/241—Differential pressure systems
    • B60T13/242—The control valve is provided as one unit with the servomotor cylinder
    • B60T13/245—Hydraulic command of the control valve, hydraulic transmission to the brake

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

890,629. Fluid pressure brakes. CLAYTON DEWANDRE CO. Ltd. March 6, 1958 [March 12, 1957], No. 8140/57. Class 103 (1). A servo-assisted brake operating mechanism for road vehicles of the kind in which the output of a vacuum-operated piston and cylinder type servo motor is transmitted through an hydraulic system to the brake-actuating cylinders of the road wheels, the servomotor being of the vacuum-suspended type, has an hydraulic cylinder forming part of the hydraulic system supported on an end wall of the servomotor for actuation by the servo piston through a thrustrod, and a vacuum reservoir in the form of a supplementary cylinder section supported coaxially of the servo cylinder to form a unit therewith, said reservoir being connected to that end of the servo cylinder permanently maintained under vacuum and having a reserve of negative pressure sufficient for at least several brake actuations. The servo cylinder 4 comprises a piston 5 which is connected by a thrust-rod 6b to the piston (not shown) of an auxiliary hydraulic cylinder 1 which, together with a control valve 2, is mounted on an end wall 3 of the servomotor. The wall of cylinder 4 seats on a flange of a perforated diaphragm 15, formed with a bearing 16 for the axiallymovable thrust-rod 6b and a supplementary cylinder 4a is positioned between diaphragm 15 and end wall 3, the whole being clamped together by bolts. A conduit 8 places valve 2 in communication with the outer part of cylinder 4 by a connection, not shown, and the inner part of the cylinder, and cylinder 4a, is connected to a source of vacuum through a connection (not shown) in end wall 3. A further embodiment is described in which cylinder 4 is attached directly to end wall 3 and the supplementary cylinder is secured to cylinder 4 by an imperforate wall, the cylinders being individually connected to conduit 8. In a still further embodiment the control valve and hydraulic cylinder mounted on the end wall are enclosed by the supplementary cylinder. It is stated that the unit may be used as a slave vacuum servo unit in a tractor/trailer braking system. Specification 620,407 is referred to.
GB814057A 1957-03-12 1957-03-12 Improvements in or relating to servo-assisted brake-operating mechanisms Expired GB890629A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE565646D BE565646A (en) 1957-03-12
GB814057A GB890629A (en) 1957-03-12 1957-03-12 Improvements in or relating to servo-assisted brake-operating mechanisms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB814057A GB890629A (en) 1957-03-12 1957-03-12 Improvements in or relating to servo-assisted brake-operating mechanisms

Publications (1)

Publication Number Publication Date
GB890629A true GB890629A (en) 1962-03-07

Family

ID=9846514

Family Applications (1)

Application Number Title Priority Date Filing Date
GB814057A Expired GB890629A (en) 1957-03-12 1957-03-12 Improvements in or relating to servo-assisted brake-operating mechanisms

Country Status (2)

Country Link
BE (1) BE565646A (en)
GB (1) GB890629A (en)

Also Published As

Publication number Publication date
BE565646A (en)

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