EP1306562B1 - Verin hydraulique avec dispositif de retenue - Google Patents

Verin hydraulique avec dispositif de retenue Download PDF

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Publication number
EP1306562B1
EP1306562B1 EP20020022504 EP02022504A EP1306562B1 EP 1306562 B1 EP1306562 B1 EP 1306562B1 EP 20020022504 EP20020022504 EP 20020022504 EP 02022504 A EP02022504 A EP 02022504A EP 1306562 B1 EP1306562 B1 EP 1306562B1
Authority
EP
European Patent Office
Prior art keywords
push rod
bellows
housing
actuator
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 - Lifetime
Application number
EP20020022504
Other languages
German (de)
English (en)
Other versions
EP1306562A1 (fr
Inventor
Patrick Desbois
Yannick Christiaens
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.)
Automotive Products France SA
Original Assignee
Automotive Products France SA
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 Automotive Products France SA filed Critical Automotive Products France SA
Publication of EP1306562A1 publication Critical patent/EP1306562A1/fr
Application granted granted Critical
Publication of EP1306562B1 publication Critical patent/EP1306562B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions

Definitions

  • This invention relates to hydraulic actuators and in particular, though not exclusively, to an actuator for use as a master cylinder for the operation of a vehicle clutch.
  • the object of the present invention to provide an improved form of hydraulic actuator which is particularly easy to install as a clutch operating master cylinder.
  • Such an hydraulic actuator is known from document US-A-2001/0010188: it comprises a housing with a piston slideable in the housing and a push rod extending from one end of the housing; a bellows encircles the push rod and is secured at one perimeter to the housing and at a second perimeter to a formation on the push rod.
  • An additional retainer is foreseen for shipment and installation in a predetermined extended position.
  • the hydraulic actuator is characterised in that the second perimeter of the bellows engages the formation on the push rod such that it retains the push rod in the predetermined extension position relative to the housing during delivery of the actuator from the manufacturer to the end user, and the actuation of the actuator after connection to an associated hydraulic circuit will disengage the second periphery of the bellows from the formation on the push rod to allow free movement of the push rod relative to the housing thereafter.
  • the bellows retains the push rod in a concentric arrangement with the piston bore so that the push rod can be easily connected with its mating portion of the clutch actuation system for example, the push rod may be provided with a ball end which snaps into a ball socket associated with an associated operating pedal.
  • the bellows may also be arranged to hold the push rod either in an extended or in a retracted position depending on the design parameters of the clutch actuating system.
  • a hydraulic master cylinder 10 for use in the operation of a vehicle clutch comprises a body 11 having a bore 12 in which a piston 13 is in sealed sliding contact. Piston 13 is connected with an associated clutch pedal shown diagramatically at 14 by a push rod 15 having a part-spherical head portion 15a which bears on a complementary part-spherical portion 13a of piston 13. A working chamber 16 is provided ahead of piston 13 which has an outlet 17 connected via a conduit (not shown) with a clutch operating slave cylinder.
  • the master cylinder also has an inlet 18 which is connected with a fluid reservoir (not shown) and also a larger diameter portion 19 of bore 12 via a passage 20.
  • Piston 13 carries a main seal 21 which is of plastics material being an integral part of an annular component 22 (see figure 3).
  • the plastics main seal 21 is energised against bore 12 by an elastomeric (e.g. rubber) annulus 23 which ensures that the seal 21 remains in contact with the associated bore etc.
  • This sealing arrangement is the subject of the Applicant's co-pending European Patent Application No. EP 0894687 A1.
  • a normal separate rubber seal can alternatively be used to seal piston 13 to bore 12.
  • the component 22 and rubber annulus 23 are held in place on the remainder of the piston by a central member 24 which is pressed into, welded or otherwise secured to the main body 25 of the piston 13.
  • the central member 24 has an axial bore 26 which is provided for manufacturing reasons (to reduce shrinkage) since the central member 24 is produced by an injection moulding technique from plastics material.
  • the central member may alternatively, for example, be of a shorter construction which may not necessarily include the shrinkage bore 26.
  • both the body 11 and piston 13 etc. are all formed from plastics material by injection moulding techniques.
  • annular sleeve 27 is provided in the larger diameter portion 19 of bore 12.
  • Sleeve 27 includes axially extending grooves 28 which in combination with bore portion 19 define passages which emerge into the smaller diameter portion 29 via openings 30 (see figure 3).
  • Sleeve 27 also includes an annular shoulder 31 against which a return spring 32 reacts. The other end of spring 32 reacts against a shoulder 33 provided on piston 13 to ensure that the piston always returns to the fully extended position shown in figures 1 and 2 when the associated pedal is released.
  • an elastomeric sealing bellows 40 has an outer bead 41 which engages in a groove 42 in housing 11 and also has an inner bead 43 which engages in a groove 44 formed in a larger diameter d2 of push rod 15 when the master cylinder is in the retracted position.
  • the bead 43 on bellows 40 serves to hold the piston 13 in its fully retracted condition and also holds the push rod 15 in axial alignment within the housing 11 thus facilitating the attachment of the push rod to the associated operating pedal 14 via a snap-in ball joint or other suitable attachment.
  • the present invention has been described above in relation to a particular master cylinder design the basic concept of using the protective bellows to hold the pushrod and piston in their retracted condition can be used on any type of pushrod master cylinder. Also, although described above in relation to a construction in which the pushrod/piston is held in its retracted (figure 1) condition the bellows arrangement of the invention can also be used to hold the pushrod/piston in its extended (figure 2) condition by appropriately axially positioning groove 44 in pushrod 15.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Claims (5)

  1. Actionneur hydraulique (10) comprenant un boítier (11) avec un piston (13) pouvant coulisser dans le boítier et une tige poussoir (15) s'étendant depuis une extrémité du boítier, un soufflet d'étanchéité (40) qui encercle la tige poussoir et est fixé au niveau d'un périmètre (41) au boítier et, au niveau d'un deuxième périmètre (43), entre en prise avec une formation (44) située sur la tige poussoir, l'actionneur étant caractérisé en ce que le deuxième périmètre (43) du soufflet d'étanchéité entre en prise avec la formation (44) située sur la tige poussoir (15) de sorte que le soufflet d'étanchéité (40) retient la tige poussoir dans une position d'extension prédéterminée par rapport au boítier (11) lorsque l'actionneur est livré par le fabricant à l'utilisateur final, et en ce que l'actionnement de l'actionneur après raccordement à un circuit hydraulique associé désengage la deuxième périphérie (43) du soufflet d'étanchéité hors de la formation (44) située sur la tige poussoir pour permettre ensuite le déplacement libre de la tige poussoir par rapport au boítier.
  2. Actionneur selon la revendication 1, caractérisé en ce que le soufflet d'étanchéité (40) retient la tige poussoir (15) dans un agencement concentrique avec l'alésage de piston (12).
  3. Actionneur selon la revendication 1 ou 2, caractérisé en ce que la tige poussoir (15) est fournie avec un embout sphérique ou un autre moyen de fixation qui s'encliquette dans une cage de rotule ou un autre moyen de fixation coopérant associé à une pédale d'entraínement (14) associée.
  4. Actionneur selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le soufflet d'étanchéité (40) est agencé pour maintenir la tige poussoir (15) soit dans une position étendue soit dans une position rétractée.
  5. Maítre cylindre de système d'actionnement d'embrayage comprenant un actionneur selon l'une quelconque des revendications 1 à 4.
EP20020022504 2001-10-26 2002-10-07 Verin hydraulique avec dispositif de retenue Expired - Lifetime EP1306562B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0125692A GB0125692D0 (en) 2001-10-26 2001-10-26 Hydraulic dampers
GB0125692 2001-10-26

Publications (2)

Publication Number Publication Date
EP1306562A1 EP1306562A1 (fr) 2003-05-02
EP1306562B1 true EP1306562B1 (fr) 2004-11-17

Family

ID=9924554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020022504 Expired - Lifetime EP1306562B1 (fr) 2001-10-26 2002-10-07 Verin hydraulique avec dispositif de retenue

Country Status (3)

Country Link
EP (1) EP1306562B1 (fr)
DE (1) DE60201957D1 (fr)
GB (1) GB0125692D0 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009019586B4 (de) 2008-05-23 2023-12-07 Schaeffler Technologies AG & Co. KG Geberzylinderanordnung
DE102010061948A1 (de) * 2010-11-25 2012-05-31 Mahle International Gmbh Montageverfahren, Montagehilfe und Aktuator
DE102014212678B4 (de) * 2014-07-01 2023-05-25 Schaeffler Technologies AG & Co. KG Transportsicherung für einen konzentrischen Nehmerzylinder
ES2746249B2 (es) * 2018-09-05 2020-07-06 Rpk S Coop Pieza unitaria elástica de centrado de vástago móvil
CN113775669B (zh) * 2021-09-19 2022-05-10 安徽江淮汽车集团股份有限公司 带有离合器半联动点力调整结构的离合主缸及离合系统

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3066506D1 (en) * 1979-10-11 1984-03-15 Knorr Bremse Gmbh Pneumatic positioning device for sustaining at least one element, for example an aeration or deaeration screen
US4557361A (en) * 1982-02-01 1985-12-10 Automotive Products Plc Shipping and installation strap for linear actuator
JP4107788B2 (ja) * 2000-01-31 2008-06-25 日信工業株式会社 車両用アクチュエータの保持構造

Also Published As

Publication number Publication date
DE60201957D1 (de) 2004-12-23
GB0125692D0 (en) 2001-12-19
EP1306562A1 (fr) 2003-05-02

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