GB1438930A - Hydraulic brake booster - Google Patents

Hydraulic brake booster

Info

Publication number
GB1438930A
GB1438930A GB146975A GB146975A GB1438930A GB 1438930 A GB1438930 A GB 1438930A GB 146975 A GB146975 A GB 146975A GB 146975 A GB146975 A GB 146975A GB 1438930 A GB1438930 A GB 1438930A
Authority
GB
United Kingdom
Prior art keywords
piston
spool
rod
pressure
rack
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
GB146975A
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB1438930A publication Critical patent/GB1438930A/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
    • B60T13/143—Master cylinder mechanically coupled with booster

Landscapes

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

Abstract

1438930 Hydraulic brake boosters ROBERT BOSCH GmbH 14 Jan 1975 [15 Jan 1974] 1469/75 Heading F2F An hydraulic booster for connection between a brake pedal and a master cylinder comprises an actuating rod 4, an hydraulic piston 9 slidable in a cylinder 8, a valve 22 for controlling flow of fluid under pressure into and out of the cylinder, and a power transmission device 16 for controlling the valve and including rolling elements in the form of gear-wheels 17, 18 carried by the rod 4 and engaging linear members in the form of toothed racks 19, 20 on which the elements 17, 18 roll one rack 19 being secured to the piston 9 and the other being displaceable and coupled to the valve 22 which is a slide valve having a spool 23 acted upon by a spring 24. The spool 23 has an aperture 25 for receiving a collar 26 of a lever 27 pivoted in a screw 29, the other end 35 of the lever engaging in a groove 31 in the rack 20. On application of the brakes rod 4 moves into the booster rotating wheels 17, 18 and moving rack 20, the piston 9 being initially held by spring 10 and by the master cylinder. Spring 24 can then displace spool 23 to close an outlet port 33 and open communication between an inlet port 34 and a pressure chamber 6 the hydraulic pressure in which can then displace piston 9 and actuate the master cylinder. Rod 4 continues to move until the increasing hydraulic pressure on its end face produces a force equal to the foot pressure on the brake pedal, the piston 9 then moving spool 23 by way of rack 19 and gear-wheels 17, 18, rack 20 and lever 27 to close inlet 34. When the foot pressure is decreased, rod 4 moves to displace spool 23 until port 33 communicates with chamber 6 so that fluid can flow out and allow piston 9 to close port 33 again so that equilibrium prevails again at a lower level. If pressure at port 34 fails as a result of a defect in the system rod 4 mechanically displaces piston 9 and spool 23 is carried along by way of transmission device 16, the foot pressure being transmitted directly to the piston 9.
GB146975A 1974-01-15 1975-01-14 Hydraulic brake booster Expired GB1438930A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742401661 DE2401661C2 (en) 1974-01-15 1974-01-15 Hydraulic brake booster

Publications (1)

Publication Number Publication Date
GB1438930A true GB1438930A (en) 1976-06-09

Family

ID=5904777

Family Applications (1)

Application Number Title Priority Date Filing Date
GB146975A Expired GB1438930A (en) 1974-01-15 1975-01-14 Hydraulic brake booster

Country Status (4)

Country Link
DE (1) DE2401661C2 (en)
FR (1) FR2257474B3 (en)
GB (1) GB1438930A (en)
SE (1) SE396922B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4387569A (en) * 1980-11-06 1983-06-14 General Motors Corporation Hydraulic brake booster
EP0226760A2 (en) * 1985-12-09 1987-07-01 AlliedSignal Inc. Hydraulic brake booster with cam and lever ratio changer

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1579827A (en) * 1976-05-21 1980-11-26 Girling Ltd Fluid-pressure operated boosters for vehicle braking systems
GB1580125A (en) * 1976-05-22 1980-11-26 Girling Ltd Fluid-pressure operated servo-motor assemblies for vehicle braking systems
GB2015102B (en) * 1978-02-25 1982-09-22 Girling Ltd Fluid-pressure operated servo-motor assemblies
DE3136975A1 (en) * 1981-09-17 1983-04-14 Alfred Teves Gmbh, 6000 Frankfurt HYDRAULIC POWER AMPLIFIER
DE3904672A1 (en) * 1989-02-16 1990-08-23 Teves Gmbh Alfred Hydraulic power amplifier, in particular for skid-controlled brake systems

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB704058A (en) * 1951-11-30 1954-02-17 Gen Motors Corp Improved power steering mechanism for road vehicles
US3549207A (en) * 1969-02-24 1970-12-22 Henry L Hayes Safety brake apparatus
US3719044A (en) * 1971-08-18 1973-03-06 Bendix Corp Hybrid brake booster control valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4387569A (en) * 1980-11-06 1983-06-14 General Motors Corporation Hydraulic brake booster
EP0226760A2 (en) * 1985-12-09 1987-07-01 AlliedSignal Inc. Hydraulic brake booster with cam and lever ratio changer
EP0226760A3 (en) * 1985-12-09 1987-12-02 Allied Corporation Hydraulic brake booster with cam and lever ratio changer

Also Published As

Publication number Publication date
DE2401661A1 (en) 1975-07-17
SE396922B (en) 1977-10-10
SE7500361L (en) 1975-07-16
FR2257474A1 (en) 1975-08-08
DE2401661C2 (en) 1983-08-11
FR2257474B3 (en) 1977-09-30

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Legal Events

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