FR2271966A1 - Pneumatic control valve for trailer brakes - which holds trailer pressure in direct relationship to towing unit pressure - Google Patents

Pneumatic control valve for trailer brakes - which holds trailer pressure in direct relationship to towing unit pressure

Info

Publication number
FR2271966A1
FR2271966A1 FR7516231A FR7516231A FR2271966A1 FR 2271966 A1 FR2271966 A1 FR 2271966A1 FR 7516231 A FR7516231 A FR 7516231A FR 7516231 A FR7516231 A FR 7516231A FR 2271966 A1 FR2271966 A1 FR 2271966A1
Authority
FR
France
Prior art keywords
trailer
pressure
brakes
towing unit
holds
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
FR7516231A
Other languages
French (fr)
Other versions
FR2271966B3 (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.)
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 FR2271966A1 publication Critical patent/FR2271966A1/en
Application granted granted Critical
Publication of FR2271966B3 publication Critical patent/FR2271966B3/fr
Granted 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
    • B60T13/26—Compressed-air systems
    • B60T13/268—Compressed-air systems using accumulators or reservoirs
    • 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
    • B60T13/26—Compressed-air systems
    • B60T13/40—Compressed-air systems indirect, i.e. compressed air booster units indirect systems
    • B60T13/403—Compressed-air systems indirect, i.e. compressed air booster units indirect systems specially adapted for coupling with dependent systems, e.g. tractor-trailer systems
    • 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
    • B60T15/18—Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere

Abstract

The pneumatic brake system of the towing vehicle operates at a high pressure in order to reduce the size of air pressure reservoirs, and to increase the response of braking. The trailer brakes operate at lower pressures and are coupled to the towing unit brakes by a special valve which controls the ratio of pressures rather than the absolute pressure of the trailer brakes. During braking both towing unit and trailer pressures drop by proportionate amounts, while the valve maintains the pressure ratio. This prevents large amounts of air draining from the high pressure side to the low pressure side during successive braking, so that the towing unit brakes remain at their most effective level.
FR7516231A 1974-05-24 1975-05-23 Pneumatic control valve for trailer brakes - which holds trailer pressure in direct relationship to towing unit pressure Granted FR2271966A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742425016 DE2425016A1 (en) 1974-05-24 1974-05-24 COMPRESSED AIR BRAKE DEVICE FOR TRAILERS

Publications (2)

Publication Number Publication Date
FR2271966A1 true FR2271966A1 (en) 1975-12-19
FR2271966B3 FR2271966B3 (en) 1978-12-01

Family

ID=5916306

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7516231A Granted FR2271966A1 (en) 1974-05-24 1975-05-23 Pneumatic control valve for trailer brakes - which holds trailer pressure in direct relationship to towing unit pressure

Country Status (2)

Country Link
DE (1) DE2425016A1 (en)
FR (1) FR2271966A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2735506A1 (en) * 1977-08-06 1979-02-15 Bosch Gmbh Robert THROTTLE VALVE

Also Published As

Publication number Publication date
DE2425016A1 (en) 1975-12-11
FR2271966B3 (en) 1978-12-01

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