GB1502109A - Power servomotor for a vehicle braking system - Google Patents

Power servomotor for a vehicle braking system

Info

Publication number
GB1502109A
GB1502109A GB2324475A GB2324475A GB1502109A GB 1502109 A GB1502109 A GB 1502109A GB 2324475 A GB2324475 A GB 2324475A GB 2324475 A GB2324475 A GB 2324475A GB 1502109 A GB1502109 A GB 1502109A
Authority
GB
United Kingdom
Prior art keywords
chamber
valve
pedal
pressure
reservoir
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
GB2324475A
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.)
Bendix Corp
Original Assignee
Bendix Corp
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 claimed from US481433A external-priority patent/US3911681A/en
Priority claimed from US481432A external-priority patent/US3910047A/en
Priority claimed from US05/484,381 external-priority patent/US3937021A/en
Application filed by Bendix Corp filed Critical Bendix Corp
Publication of GB1502109A publication Critical patent/GB1502109A/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
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting 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
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/224—Master 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
    • 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
    • B60T13/244—Mechanical command of the control valve, hydraulic transmission to the brakes
    • 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
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/565—Vacuum systems indirect, i.e. vacuum booster units characterised by being associated with master cylinders, e.g. integrally formed

Abstract

1502109 Vacuum servomotors BENDIX CORP 28 May 1975 [20 June 1974 (2) 1 July 1974] 23244/75 Heading F2F [Alsoin Division G3] A power servomotor comprises power portion 12 operated by pedal 20 to cause closure of communication between chambers 30 and 32 by surface 68 engaging seat 78 and opening of communication between atmosphere and chamber32 by cylindrical section 82 moving away from surface 68, resulting in leftward movement of piston assembly 114 to generate an hydraulic pressure in a large diameter first pressurizing chamber 134 which communicates with a second pressurizing chamber 146 via passage 152 and valve 156, chamber 146 being connected to rear brakes 16. At "vacuum runout" when chamber 32 is filled with air at atmospheric pressure valve 156 is closed and a valve 188, controlling communication between first chamber 134 and a relief chamber 136 connected to reservoir 144, is opened to reduce pressure in chamber 134 so that the area effective to generate pressure in chamber 146 is reduced from the area of chamber 134 to that of chamber 146 to provide an increased brake pressure for a given input force on pedal 20. In a second embodiment the plunger 66 coupling pedal 20 with the actuator of valve 188 incorporates radial spring levers to convey "feel" of the brake pressure to the operator in the form of a reaction force on pedal 20. In other embodiments the plunger 66 may be rigidly coupled to the actuator of valve 188 and passages 138 and 141, communicating reservoir 144 with chambers 134 and 136 respectively, may house a ball valve and a ball tilt valve respectively, so that the connection between relief chamber 136 and reservoir 144 is closed when piston assembly 114 has travelled a certain distance, so insuring against a sudden drop in brake pressure in the event of vacuum failure.
GB2324475A 1974-06-20 1975-05-28 Power servomotor for a vehicle braking system Expired GB1502109A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US481433A US3911681A (en) 1974-06-20 1974-06-20 Control means for a two-stage servomotor
US481432A US3910047A (en) 1974-06-20 1974-06-20 Two stage servomotor with smooth actuation sequence
US05/484,381 US3937021A (en) 1974-07-01 1974-07-01 Hold off valve for a two stage servomotor

Publications (1)

Publication Number Publication Date
GB1502109A true GB1502109A (en) 1978-02-22

Family

ID=27413569

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2324475A Expired GB1502109A (en) 1974-06-20 1975-05-28 Power servomotor for a vehicle braking system

Country Status (4)

Country Link
JP (1) JPS5113072A (en)
DE (1) DE2526391A1 (en)
FR (1) FR2275668A1 (en)
GB (1) GB1502109A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004477A1 (en) * 1978-03-29 1979-10-03 Tokico Ltd. Force-multiplying pneumatic device
DE3412397A1 (en) * 1984-04-03 1985-10-10 Alfred Teves Gmbh, 6000 Frankfurt VACUUM-POWERED BRAKE-POWER AMPLIFIER WITH MAIN CYLINDER

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972191A (en) * 1975-08-11 1976-08-03 The Bendix Corporation Balanced servomotor valve
US4133178A (en) * 1977-04-18 1979-01-09 General Motors Corporation Quick take-up master cylinder
JPS5482883U (en) * 1977-11-25 1979-06-12
JPS592667B2 (en) * 1978-05-31 1984-01-19 トキコ株式会社 pneumatic booster
JPS5632151Y2 (en) * 1978-07-13 1981-07-31
WO2004022398A1 (en) * 2002-09-05 2004-03-18 Freni Brembo S.P.A. Vehicle braking system master cylinder
CN107738637A (en) * 2017-11-15 2018-02-27 宁波市鄞州堃信工业产品设计有限公司 The integrated total pumping system of control of pressure difference side valve type braking clutch
WO2019133960A1 (en) * 2017-12-31 2019-07-04 Kelsey-Hayes Company Vehicle brake system and method of detecting piston location of a plunger assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004477A1 (en) * 1978-03-29 1979-10-03 Tokico Ltd. Force-multiplying pneumatic device
DE3412397A1 (en) * 1984-04-03 1985-10-10 Alfred Teves Gmbh, 6000 Frankfurt VACUUM-POWERED BRAKE-POWER AMPLIFIER WITH MAIN CYLINDER

Also Published As

Publication number Publication date
FR2275668A1 (en) 1976-01-16
JPS5113072A (en) 1976-02-02
JPS5720181B2 (en) 1982-04-27
DE2526391A1 (en) 1976-01-08
FR2275668B1 (en) 1978-02-24

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Legal Events

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