GB2013296A - Power-operated boosters - Google Patents

Power-operated boosters

Info

Publication number
GB2013296A
GB2013296A GB7902580A GB7902580A GB2013296A GB 2013296 A GB2013296 A GB 2013296A GB 7902580 A GB7902580 A GB 7902580A GB 7902580 A GB7902580 A GB 7902580A GB 2013296 A GB2013296 A GB 2013296A
Authority
GB
United Kingdom
Prior art keywords
piston
spool
chamber
working chamber
operated
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.)
Granted
Application number
GB7902580A
Other versions
GB2013296B (en
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.)
Girling Ltd
Original Assignee
Girling 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 Girling Ltd filed Critical Girling Ltd
Priority to GB7902580A priority Critical patent/GB2013296B/en
Publication of GB2013296A publication Critical patent/GB2013296A/en
Application granted granted Critical
Publication of GB2013296B publication Critical patent/GB2013296B/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
    • B60T13/12—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 liquid
    • B60T13/14—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 liquid using accumulators or reservoirs fed by pumps
    • B60T13/142—Systems with master cylinder
    • B60T13/145—Master cylinder integrated or hydraulically coupled with booster

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

A pedal-operated brake booster incorporates a valve mechanism for controlling pressurisation of a boost chamber 52. The valve mechanism comprises a pedal-operated piston 5 and a pressure-responsive valve spool 19 which is coupled to the piston 5 for limited relative movement in a longitudinal direction within a working chamber 54 in the piston 5. The spool 19 is movable with the piston 5 (by ring 26 abutting shoulder 65) in an initial brake-applying direction in which the spool 19 is operative to isolate (at bores 35, 36) the boost chamber 52 from an exhaust port 38 and the piston 5 is operative (by its shoulder 15) to place an inlet port 12 in communication with the working chamber 54. This causes the spool 19 to move relatively away from the piston 5 in response to pressure fluid in the working chamber 54 which fluid is admitted (via passages 29, 66 and 33) to the boost chamber 52 hence providing a greater movement of a master cylinder piston 8 than of the piston 5 unless there is a pressure supply failure when the piston 5 actuates the piston 8 directly. The pistons 7 and 8 may be separate or integral. <IMAGE>
GB7902580A 1978-01-31 1979-01-24 Power operated boosters Expired GB2013296B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7902580A GB2013296B (en) 1978-01-31 1979-01-24 Power operated boosters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB378278 1978-01-31
GB7902580A GB2013296B (en) 1978-01-31 1979-01-24 Power operated boosters

Publications (2)

Publication Number Publication Date
GB2013296A true GB2013296A (en) 1979-08-08
GB2013296B GB2013296B (en) 1982-12-08

Family

ID=26238587

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7902580A Expired GB2013296B (en) 1978-01-31 1979-01-24 Power operated boosters

Country Status (1)

Country Link
GB (1) GB2013296B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038699A1 (en) * 1980-04-23 1981-10-28 LUCAS INDUSTRIES public limited company Improvements in power-operated boosters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038699A1 (en) * 1980-04-23 1981-10-28 LUCAS INDUSTRIES public limited company Improvements in power-operated boosters

Also Published As

Publication number Publication date
GB2013296B (en) 1982-12-08

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee