FR2262244A1 - Safety air brake changeover cylinder - prevents contamination of air system by hydraulic oil - Google Patents

Safety air brake changeover cylinder - prevents contamination of air system by hydraulic oil

Info

Publication number
FR2262244A1
FR2262244A1 FR7501338A FR7501338A FR2262244A1 FR 2262244 A1 FR2262244 A1 FR 2262244A1 FR 7501338 A FR7501338 A FR 7501338A FR 7501338 A FR7501338 A FR 7501338A FR 2262244 A1 FR2262244 A1 FR 2262244A1
Authority
FR
France
Prior art keywords
passage
oil
air
spring
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.)
Withdrawn
Application number
FR7501338A
Other languages
French (fr)
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.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Publication of FR2262244A1 publication Critical patent/FR2262244A1/en
Withdrawn legal-status Critical Current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
    • B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
    • B60T15/02—Application and release valves
    • 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
    • B60T13/58—Combined or convertible systems
    • B60T13/581—Combined or convertible systems both hydraulic and pneumatic

Landscapes

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

Abstract

A pneumatic braking system for a heavy vehicle includes a changeover cylinder which prevents oil from the normal high pressure hydraulic circuit entering the air circuit to prevent deterioration of its flexible membranes. Oil in the standard circuit pressurises the annular chamber (30) and forces down the hollow piston (20) against a spring (36), the upper end forming a shaft (25) of smaller diameter and a sliding fit in the passage (15). An annular groove (35) connecting with the axial passage (32) is sealed on one side (34) against oil and on the other (33) against air. A spring (22) loaded valve (20) caps the passage (32) when the piston is forced up by spring (36) on failure of oil pressure. Otherwise, the passage is open and another annular groove (27) connects the air brake system (12) around the piston head (28) to the axial passage. Oil leaking past seal (34) passes via the groove (35) to the passage and to the discharge cap (40). On failure, the air supply (11) is connected via passages (18, 16, 15a) to the braking system (12).
FR7501338A 1974-02-25 1975-01-16 Safety air brake changeover cylinder - prevents contamination of air system by hydraulic oil Withdrawn FR2262244A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US44506474A 1974-02-25 1974-02-25

Publications (1)

Publication Number Publication Date
FR2262244A1 true FR2262244A1 (en) 1975-09-19

Family

ID=23767469

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7501338A Withdrawn FR2262244A1 (en) 1974-02-25 1975-01-16 Safety air brake changeover cylinder - prevents contamination of air system by hydraulic oil

Country Status (3)

Country Link
JP (1) JPS50115327A (en)
CA (1) CA1006416A (en)
FR (1) FR2262244A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2401811A1 (en) * 1977-09-01 1979-03-30 Automotive Prod Co Ltd Servo control for trailer brakes - has direct operation from master cylinder with control pressure inversely proportional to servo pressure to allow fine control
FR2499489A1 (en) * 1981-02-11 1982-08-13 Rogat Ets Fluid return valve for vehicle braking circuit - has gate in housing to connect hydraulic actuator with fluid source or sump
EP0684401A1 (en) * 1994-05-20 1995-11-29 CLARK-HURTH COMPONENTS S.p.A. Sealed non-lubricated single-disk brake, particularly for axles of industrial and farming motor vehicles and the like

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4200505B2 (en) 2006-10-20 2008-12-24 いすゞ自動車株式会社 Cab substructure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2401811A1 (en) * 1977-09-01 1979-03-30 Automotive Prod Co Ltd Servo control for trailer brakes - has direct operation from master cylinder with control pressure inversely proportional to servo pressure to allow fine control
FR2499489A1 (en) * 1981-02-11 1982-08-13 Rogat Ets Fluid return valve for vehicle braking circuit - has gate in housing to connect hydraulic actuator with fluid source or sump
EP0684401A1 (en) * 1994-05-20 1995-11-29 CLARK-HURTH COMPONENTS S.p.A. Sealed non-lubricated single-disk brake, particularly for axles of industrial and farming motor vehicles and the like

Also Published As

Publication number Publication date
JPS50115327A (en) 1975-09-09
CA1006416A (en) 1977-03-08

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Legal Events

Date Code Title Description
ST Notification of lapse