EP0467889A1 - Ensemble piston-cylindre a soupape centrale, notamment pour circuits de freinage de vehicule - Google Patents

Ensemble piston-cylindre a soupape centrale, notamment pour circuits de freinage de vehicule

Info

Publication number
EP0467889A1
EP0467889A1 EP19900903588 EP90903588A EP0467889A1 EP 0467889 A1 EP0467889 A1 EP 0467889A1 EP 19900903588 EP19900903588 EP 19900903588 EP 90903588 A EP90903588 A EP 90903588A EP 0467889 A1 EP0467889 A1 EP 0467889A1
Authority
EP
European Patent Office
Prior art keywords
valve
valve stem
piston
spring
cylinder
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Withdrawn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
EP19900903588
Other languages
German (de)
English (en)
Inventor
Georg Kehl
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 EP0467889A1 publication Critical patent/EP0467889A1/fr
Withdrawn legal-status Critical Current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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
    • B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
    • B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
    • B60T8/489—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems using separate traction control modulators
    • 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
    • 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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/38—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including valve means of the relay or driver controlled type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/60—Biased catch or latch

Definitions

  • Cylinder-piston unit with central valve especially for
  • the invention is based on a cylinder-piston unit
  • the known unit has the disadvantage that the screw connection between the valve stem and the valve body is not secured against loosening. This can cause a change in the distance between the closing member and the valve seat, which disadvantageously results in a change in the closing path of this valve Consequence. Therefore, a change in the tether arrangement of the return spring also occurs due to the change in the distance between the spring plates.
  • the screw connection allows misalignment between the valve stem and the valve body, which the
  • the piston-cylinder unit according to the invention with the characterizing features of the main claim has the advantage that a positive connection between the sleeve and the valve stem is achieved by gripping the sleeve over the snap ring, which meets very high safety requirements. Even if the snap ring breaks, the connection cannot be loosened because it cannot come out of the groove in the valve stem. The effect of the actuating spring on the valve stem is therefore retained. In addition, no change in the valve closing path and the tether arrangement of the return spring can occur. In addition, the integral connection between the valve closing member and the valve stem provides great security against separation of these two particularly safety-relevant components. Finally, it is advantageous that the individual parts spring plate, springs, valve stem with closing member, sleeve and snap ring form an assembly which can be preassembled and checked independently of the piston before it is inserted into the cylinder.
  • the measure according to claim 2 is particularly advantageous because the dimensioning of the valve closing member with regard to the size of the sleeve inner bore the connection of the closing member with the Valve stem allowed in a joining process, which before assembly of the individual parts to be lined up on the valve stem (spring plate,
  • the development according to claim 3 is advantageous in that the design of the valve seat during the closing process of the central valve causes a centering of the closing member, the shaft of which can compensate for misalignment by the shape of the federal government, without thereby reducing the size of the contact surface of the spring plate on the valve stem remote from the piston.
  • FIG. 1 shows a cylinder-piston unit with a central valve in section
  • FIG. 2 shows the central valve as a preassembled module on a different scale than in FIG. 1.
  • the cylinder-piston unit 10 shown in the drawing is used in a traction control system with brake intervention of a motor vehicle.
  • the arrangement 10 has a cylinder 11, in the bore 12 of which a plunger 13 is arranged (FIG. 1).
  • the piston 13 is due to the effect of a not shown
  • the cylinder 11 is equipped with a connector 16 for connecting a line, not shown, coming from the master cylinder of the vehicle.
  • the plunger 13 has a passage 18 which ends at the bottom of a piston bore 19 in a valve seat 20 with a hollow conical seat surface 21.
  • a central valve 23 arranged in the return spring-side space 22 of the cylinder 11 cooperates with the plunger 13.
  • the central valve 23 has a circular cylindrical valve stem 25 which is provided with a collar 26 at one end portion (FIG. 2).
  • This collar 26 has a spherical zone
  • This support surface 27 is assigned a suitably designed counter surface 28 of a spring plate 29 penetrated by the valve stem 25.
  • the spring plate 29 is supported on the base 30 of the cylinder 11 under the action of the return spring 15 designed as a cylindrical compression spring.
  • a second spring plate 31 sits on the valve stem 25 and cooperates with the plunger 13. This spring plate 31 is also under the action of the return spring 15.
  • the valve stem 25 carries at its end section facing away from the collar 26 a ball 33 as a closing member of the central valve 23.
  • the ball 33 has a smaller diameter than the valve stem 25 and is integrally connected (by welding) to it.
  • the valve stem 25 Near the ball 33, the valve stem 25 has an annular groove 34 for receiving a snap ring 35.
  • a sleeve 36 with a suitably designed inner bore 37 is guided on the valve stem 25.
  • the sleeve 36 On the piston side, the sleeve 36 has a section 38 of its inner bore 37 which is enlarged in diameter and with which it fits over the snap ring 35 which engages in the groove 34.
  • the sleeve 36 Toward the spring plate 31, the sleeve 36 is provided with a section 39 of reduced diameter.
  • An actuating spring 40 designed as a cylindrical compression spring is guided on this, which acts on the one hand on the sleeve 36 and on the other hand on the spring plate 31.
  • the spring plate 29 is pushed onto the valve stem 25 until it rests on the collar 26.
  • the return spring 25 is then centered on the spring plate 29 and the spring plate 31 is arranged on the valve stem 25.
  • the valve stem 25 is released so far from the spring plate 31 that the sleeve 36 with the actuating spring 40 seated thereon can be pushed onto the valve stem 25 until the groove 34 is exposed.
  • the snap ring 35 is inserted into the groove 34 and the return spring 15 is relieved.
  • the sleeve 36 which is longitudinally displaced on the valve stem, overlaps its inner bore 37 with the enlarged section 38 and the snap ring 35.
  • the snap ring 35 is thereby secured against escaping from its groove 34.
  • the sleeve 36 supported on the snap ring 35 and the collar 26 form end cross-sectional enlargements of the valve stem 25 for engaging the spring plates 29 and 31, so that a tether arrangement of the return spring 15 is achieved.
  • the assembled and inserted into the cylinder 11 has the following function in cooperation with the piston 13:
  • valve stem 25 of the central valve 23 is initially held in place due to the action of the actuating spring 40 as a result of the attack by the collar 26 on the spring plate 29.
  • the valve seat 20 meets the ball 33 of the valve stem 25.
  • the seat surface 21 centers the ball 33 of the valve stem 25 guided with play in the piston bore 19 with its sleeve 36
  • Valve stem 25 is compensated for by a relative movement of the collar 26 on the spring plate 29 without the support surface 26 of the collar losing contact with the counter surface 28 of the spring plate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Hydraulic Control Valves For Brake Systems (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

Ces ensembles à soupapes centrales sont des composants d'importance vitale pour la sécurité et doivent répondre à des exigences sévères (montage irréprochable, fiabilité). La soupape centrale comprend une tige (25) sur laquelle sont agencées deux coupelles de ressort (29, 31) pourvues de ressorts de rappel (15) précontraints. Les coupelles de ressorts (29, 31) sont saisies par derrière grâce à des agrandissements de section de la tige de soupape (25), laquelle comporte un élément de fermeture de soupape (33). Un agrandissement de section est formé par un épaulement (26) de la tige de soupape (25). Un autre agrandissement de section est constitué par un manchon (36) qui est guidé longitudinalement sur la tige de soupape (25). Le manchon (36) comporte sur sa face opposée aux ressorts un alésage interne élargi (38) avec lequel il s'emboîte sur un circlip (35) s'engageant dans la tige de soupape (25). On obtient ainsi une liaison de forme entre le manchon (36) et la tige de soupape (25), qui assure la cohésion du bloc pré-assemblé constitué des parties précitées.
EP19900903588 1989-04-12 1990-02-27 Ensemble piston-cylindre a soupape centrale, notamment pour circuits de freinage de vehicule Withdrawn EP0467889A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3911911 1989-04-12
DE3911911A DE3911911A1 (de) 1989-04-12 1989-04-12 Zylinder-kolben-einheit mit zentralventil, insbesondere fuer fahrzeugbremsanlagen

Publications (1)

Publication Number Publication Date
EP0467889A1 true EP0467889A1 (fr) 1992-01-29

Family

ID=6378458

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900903588 Withdrawn EP0467889A1 (fr) 1989-04-12 1990-02-27 Ensemble piston-cylindre a soupape centrale, notamment pour circuits de freinage de vehicule

Country Status (5)

Country Link
US (1) US5159871A (fr)
EP (1) EP0467889A1 (fr)
JP (1) JPH04504392A (fr)
DE (1) DE3911911A1 (fr)
WO (1) WO1990011918A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5214917A (en) * 1992-09-14 1993-06-01 Allied-Signal Inc. Center valve master cylinder with self-adjusting compensation center valve
DE4232311C1 (de) * 1992-09-26 1994-02-24 Bosch Gmbh Robert Hydraulische Fahrzeugbremsanlage mit Blockierschutzeinrichtung
US5400595A (en) * 1994-02-25 1995-03-28 Deere & Company Brake valve with prefill chamber unloading
DE10014435B4 (de) * 2000-03-16 2004-04-15 Bosch Rexroth Teknik Ab Mehrwegeventil

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1170802B (de) * 1962-07-13 1964-05-21 Teves Kg Alfred Zweikreishauptzylinder fuer hydraulische Kraftfahrzeugbremsanlagen
US4405251A (en) * 1980-03-06 1983-09-20 Miller Fluid Power Corporation Retaining ring locking device
DE3117551A1 (de) * 1981-05-04 1983-01-27 Alfred Teves Gmbh, 6000 Frankfurt Hauptzylinder fuer hydraulisch betaetigte kraftfahrzeugbremsen
JP2512732B2 (ja) * 1987-02-02 1996-07-03 マツダ株式会社 車両の制動制御装置
FR2619774B1 (fr) * 1987-08-28 1992-03-27 Teves Gmbh Alfred Systeme de freinage a regulation du glissement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9011918A1 *

Also Published As

Publication number Publication date
US5159871A (en) 1992-11-03
JPH04504392A (ja) 1992-08-06
DE3911911A1 (de) 1990-10-18
WO1990011918A1 (fr) 1990-10-18

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19910904

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Designated state(s): DE FR GB

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ROBERT BOSCH GMBH

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Withdrawal date: 19921202

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Effective date: 19921202