EP0000794B1 - Zweikreis-Steuerventil - Google Patents

Zweikreis-Steuerventil Download PDF

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Publication number
EP0000794B1
EP0000794B1 EP78200086A EP78200086A EP0000794B1 EP 0000794 B1 EP0000794 B1 EP 0000794B1 EP 78200086 A EP78200086 A EP 78200086A EP 78200086 A EP78200086 A EP 78200086A EP 0000794 B1 EP0000794 B1 EP 0000794B1
Authority
EP
European Patent Office
Prior art keywords
valve
spring
separate
piston
balancing 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.)
Expired
Application number
EP78200086A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0000794A1 (de
Inventor
Manfred Siebold
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 EP0000794A1 publication Critical patent/EP0000794A1/de
Application granted granted Critical
Publication of EP0000794B1 publication Critical patent/EP0000794B1/de
Expired legal-status Critical Current

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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
    • B60T15/04—Driver's valves
    • B60T15/043—Driver's valves controlling service pressure brakes
    • B60T15/045—Driver's valves controlling service pressure brakes in multiple circuit systems, e.g. dual circuit systems
    • B60T15/046—Driver's valves controlling service pressure brakes in multiple circuit systems, e.g. dual circuit systems with valves mounted in tandem

Definitions

  • the invention is based on a two-circuit control valve according to the preamble of the main claim.
  • a control valve is known (US-A-3 291 539).
  • the object of the invention is to keep the response behavior of the two individual valves and the pressure changes introduced into the two circuits by the same.
  • a two-circuit control valve is used as a two-circuit brake valve and has a housing 1, in which an actuating rod 2 is inserted from above.
  • the rod 2 presses on a sleeve 3 with a shoulder 4, under which a travel spring 5 lies.
  • the other end of the travel spring 5 engages a staging and reaction piston 6, which carries an outlet valve seat 7 of a first individual valve 8 at its other end.
  • a second valve seat 9 of the individual valve 8 is located on a fixed housing part, which limits a pressure change chamber 10 towards the piston 6 and which accommodates a storage chamber 11 on the inside.
  • the storage chamber 11 is connected via a threaded connection to a supply line of a brake circuit I, which is fed via the pressure swing chamber 10 and a threaded connection.
  • a closing body 13 works together with the two valve seats 7 and 9 and is pressed against the seats by a valve spring 12.
  • the other end of the valve spring 12 is supported on an inner shoulder 14 of a weighing piston 17 which on the one hand delimits the pressure change chamber 10 of the brake circuit I and on the other hand a pressure change chamber of the brake circuit 11.
  • the weighing piston has a coaxial tubular extension 15, one end of which seals penetrates an annular wall 16 inserted into the housing 1 and on which the closing body 13 with an annular sealing lip is placed so as to be axially movable.
  • the inner diameter of the annular wall 16 is equal to the diameter of the outlet valve seat 22 of the second individual valve 19, so that the weighing piston 17 has the same effective surfaces upwards and downwards.
  • the weighing piston 17 is provided with an axial through-bore 21 through the tube extension 15. On its circumference it carries two O-rings 24 and 25, between which an outside air chamber 17 'is arranged. This outside air chamber 17' is connected to the bore 21 via a radial channel 20.
  • the weighing piston 17 is also provided at its other end with the outlet valve seat 22, which projects into an inlet seat 18 of a second individual valve 19 which is fixed to the housing.
  • the inlet seat 18 lies between a pressure change chamber 26 and a storage chamber 27, in which a closing body 28 of the second individual valve for a brake circuit II is arranged.
  • the housing 1 is closed at the bottom by an inserted wall 1 ', on which both a valve spring 29 of the second individual valve 19 and a compression spring 30 acting on the weighing piston 17 are supported.
  • the wall 1 ' has a tubular cylindrical projection, on which the closing body 28 is placed with an annular sealing lip so as to be axially movable.
  • the closing body 13 of the first individual valve 8 and the closing body 28 of the second individual valve 19 are axially pierced to relieve their pressure.
  • a common connection of the two individual valves 8 and 19 to the outside air is established via these perforations in the closing body and via an outside air connection 23.
  • the spring 30 lies within the second individual valve 19. Its upper end engages under a spring plate 31 and tries to hold it on a radial wall 32 of the weighing piston 17.
  • This wall 32 is provided with several axially parallel openings 33 for the passage of air.
  • the wall 32 has a coaxial bore 34 which is penetrated by one end of a plunger 35 which is in contact with the spring plate 31.
  • the plunger 35 is screwed with its other end in the staging and reaction piston 6, which likewise has a plurality of axially parallel openings 36 for the air passage on the inside.
  • the screw connection is variable in length in order to adjust the distance between the outlet valve seat 22 of the second individual valve 19 and the outlet valve seat 7 of the first individual valve 8.
  • the actuating rod 2 runs into the brake valve and actuates the stepping element by pressing the travel spring 5. and reaction piston 6.
  • the plunger 35 With the piston 6, the plunger 35 also moves downward and lifts the spring plate 31 from the weighing piston 17. So that the action of the compression spring 31 on the weighing piston 17 is canceled, and the weighing piston 17 is now only subject to the force of the valve spring 12, so that it makes a way down until it abuts the closing body 28.
  • the outlet valve of the second individual valve 19 is then closed.
  • An inlet valve can first be opened on the individual valve 8. With an appropriate spring design, the inlet valve of the individual valve 19 can also be opened first. In both cases, the weighing piston 17 immediately compensates by opening the inlet valve of the other individual valve as well as simultaneously under the pressure introduced into the pressure change chambers 10 or 26. The brake cylinders of both brake circuits I and II are then supplied evenly with the same brake pressure. When the inlet valves are open, the forces of the compression spring 30 and the two valve springs 12 and 29 of the individual valves 8 and 19 are decisive for the restoring forces on the two individual valves 8 and 19. The spring force of the valve spring 12 is also decisive for the opening force on the second individual valve 19.
  • a rubber spring can also be used as a travel spring.
  • the connections for the reservoir and the brake cylinder are arranged at the same height on the housing 1 for each brake circuit I or II.
  • control valve according to the invention Due to the plunger 35 arranged inside the weighing piston 17 and the spring 30 arranged without taking up space, the control valve according to the invention is very compact, so that it takes up very little space when it is installed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
EP78200086A 1977-08-13 1978-07-07 Zweikreis-Steuerventil Expired EP0000794B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2736661A DE2736661C2 (de) 1977-08-13 1977-08-13 Zweikreis-Steuerventil
DE2736661 1977-08-13

Publications (2)

Publication Number Publication Date
EP0000794A1 EP0000794A1 (de) 1979-02-21
EP0000794B1 true EP0000794B1 (de) 1981-05-20

Family

ID=6016384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78200086A Expired EP0000794B1 (de) 1977-08-13 1978-07-07 Zweikreis-Steuerventil

Country Status (3)

Country Link
EP (1) EP0000794B1 (it)
BR (1) BR7805161A (it)
DE (2) DE2736661C2 (it)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119464B (en) * 1982-03-17 1985-03-20 Lucas Ind Plc Improvements in dual brake valves
GB2133097B (en) * 1982-11-29 1986-09-03 Dewandre Co Ltd C Pneumatic brake valve
GB8324941D0 (en) * 1983-09-17 1983-10-19 Lucas Ind Plc Dual brake valves
IT1190559B (it) * 1986-04-02 1988-02-16 Magneti Marelli Spa Distributore pneumatico di tipo duplex per impianti di frenatura per autoveicoli
DE3830105A1 (de) * 1988-09-05 1990-03-15 Knorr Bremse Ag Bremsventil fuer druckluftbremsanlagen von fahrzeugen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1010942A (en) * 1961-06-26 1965-11-24 Dewandre Co Ltd C Improvements in or relating to fluid pressure-operated braking apparatus
US3291539A (en) * 1966-03-17 1966-12-13 Wagner Electric Corp Control valve
DE1935537A1 (de) * 1969-07-12 1971-02-11 Westinghouse Bremsen U Appbau Bremsventil fuer Dreikreis-Druckluftbremsanlagen
DE1943753C3 (de) * 1969-07-12 1978-07-13 Wabco Westinghouse Gmbh, 3000 Hannover Dreikreis-Bremsventil für Druckluftbremsanlagen in Kraftfahrzeugen

Also Published As

Publication number Publication date
DE2736661A1 (de) 1979-02-22
EP0000794A1 (de) 1979-02-21
DE2736661C2 (de) 1987-04-02
BR7805161A (pt) 1979-05-02
DE2860713D1 (en) 1981-08-27

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