EP1306562A1 - Verin hydraulique avec dispositif de retenue - Google Patents
Verin hydraulique avec dispositif de retenue Download PDFInfo
- Publication number
- EP1306562A1 EP1306562A1 EP02022504A EP02022504A EP1306562A1 EP 1306562 A1 EP1306562 A1 EP 1306562A1 EP 02022504 A EP02022504 A EP 02022504A EP 02022504 A EP02022504 A EP 02022504A EP 1306562 A1 EP1306562 A1 EP 1306562A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- push rod
- housing
- bellows
- 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.)
- Granted
Links
Images
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
- an hydraulic actuator comprising 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 engages the push rod, the actuator being characterised in that the second perimeter of the bellows engages a formation on the push rod to retain the push rod in a predetermined extension position relative to the housing during delivery of the actuator from the manufacturer to the end user, actuation of the actuator after connection to an associated hydraulic circuit being arranged to 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.
Landscapes
- 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)
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 true EP1306562A1 (fr) | 2003-05-02 |
EP1306562B1 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) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012069563A1 (fr) * | 2010-11-25 | 2012-05-31 | Mahle International Gmbh | Procédé de montage, aide de montage, actionneur |
DE102014212678A1 (de) * | 2014-07-01 | 2016-01-07 | Schaeffler Technologies AG & Co. KG | Transportsicherung für einen konzentrischen Nehmerzylinder |
ES2746249A1 (es) * | 2018-09-05 | 2020-03-05 | Rpk S Coop | Pieza unitaria elástica de centrado de vástago móvil |
CN113775669A (zh) * | 2021-09-19 | 2021-12-10 | 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 |
DE102009019586B4 (de) | 2008-05-23 | 2023-12-07 | Schaeffler Technologies AG & Co. KG | Geberzylinderanordnung |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0027211A1 (fr) * | 1979-10-11 | 1981-04-22 | Knorr-Bremse Ag | Dispositif de manoeuvre pneumatique pour au moins un organe, par exemple pour jalousie de ventilation |
US4557361A (en) * | 1982-02-01 | 1985-12-10 | Automotive Products Plc | Shipping and installation strap for linear actuator |
US20010010188A1 (en) * | 2000-01-31 | 2001-08-02 | Norihisa Higuchi | Automotive actuator retaining construction |
-
2001
- 2001-10-26 GB GB0125692A patent/GB0125692D0/en not_active Ceased
-
2002
- 2002-10-07 EP EP20020022504 patent/EP1306562B1/fr not_active Expired - Lifetime
- 2002-10-07 DE DE60201957T patent/DE60201957D1/de not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0027211A1 (fr) * | 1979-10-11 | 1981-04-22 | Knorr-Bremse Ag | Dispositif de manoeuvre pneumatique pour au moins un organe, par exemple pour jalousie de ventilation |
US4557361A (en) * | 1982-02-01 | 1985-12-10 | Automotive Products Plc | Shipping and installation strap for linear actuator |
US20010010188A1 (en) * | 2000-01-31 | 2001-08-02 | Norihisa Higuchi | Automotive actuator retaining construction |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009019586B4 (de) | 2008-05-23 | 2023-12-07 | Schaeffler Technologies AG & Co. KG | Geberzylinderanordnung |
WO2012069563A1 (fr) * | 2010-11-25 | 2012-05-31 | Mahle International Gmbh | Procédé de montage, aide de montage, actionneur |
DE102014212678A1 (de) * | 2014-07-01 | 2016-01-07 | Schaeffler Technologies AG & Co. KG | Transportsicherung für einen konzentrischen Nehmerzylinder |
DE102014212678B4 (de) | 2014-07-01 | 2023-05-25 | Schaeffler Technologies AG & Co. KG | Transportsicherung für einen konzentrischen Nehmerzylinder |
ES2746249A1 (es) * | 2018-09-05 | 2020-03-05 | Rpk S Coop | Pieza unitaria elástica de centrado de vástago móvil |
CN113775669A (zh) * | 2021-09-19 | 2021-12-10 | 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 |
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 |
Also Published As
Publication number | Publication date |
---|---|
EP1306562B1 (fr) | 2004-11-17 |
DE60201957D1 (de) | 2004-12-23 |
GB0125692D0 (en) | 2001-12-19 |
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