EP0764243A1 - Commande hydraulique d'embrayage, notamment pour vehicules automobiles - Google Patents
Commande hydraulique d'embrayage, notamment pour vehicules automobilesInfo
- Publication number
- EP0764243A1 EP0764243A1 EP96907531A EP96907531A EP0764243A1 EP 0764243 A1 EP0764243 A1 EP 0764243A1 EP 96907531 A EP96907531 A EP 96907531A EP 96907531 A EP96907531 A EP 96907531A EP 0764243 A1 EP0764243 A1 EP 0764243A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- cylinder
- clutch control
- hydraulic clutch
- control according
- 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- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
- F16D25/088—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member the line of action of the fluid-actuated members being distinctly separate from the axis of rotation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
- F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
- F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
- F16D23/14—Clutch-actuating sleeves or bearings; Actuating members directly connected to clutch-actuating sleeves or bearings
- F16D2023/141—Clutch-actuating sleeves or bearings; Actuating members directly connected to clutch-actuating sleeves or bearings characterised by using a fork; Details of forks
Definitions
- Hydraulic clutch control especially for motor vehicles
- the present invention relates to clutch controls and more particularly to hydraulic clutch controls, in particular for motor vehicles.
- a declutching control comprises (FIG. 1) a declutching fork 25 capable of being pivotally mounted on a fixed support such as the casing of a gearbox.
- This fork 25 cooperates with a clutch release bearing 26 which, when actuated, is adapted to stop the elastic clamping action of an elastic diaphragm 27 on a pressure plate 28 of a friction clutch 29, of which we see a reaction plate at 30 and a friction disc at 31.
- the tilting means of the diaphragm 27 on a cover 30A secured to the plate 30 are shown diagrammatically at 27A.
- This hydraulic control comprises a hydraulic receiver comprising a fixed cylinder mounted on a counter support secured to a fixed support of the vehicle and a piston engaged sliding in leaktight manner in the cylinder to define there a variable volume chamber connected to a transmitter controlled by the clutch pedal.
- the piston rod constitutes an actuating element capable of acting in traction on the declutching fork while being mounted in an articulated manner on said fork using a driving stop.
- the declutching fork performs, during its maneuver, a movement in an arc of a circle while the piston moves in a rectilinear manner, so that the cylinder is mounted on a counter-support secured to the fixed support via a bearing in elastic material to compensate for the pendulum movement of the rod.
- This arrangement complicates the order and is not optimal with regard to the freedom of operation of the piston. In addition, it leads to a loss of efficiency due to the presence of the elastic bearing.
- the object of the present invention is to overcome these drawbacks.
- a hydraulic control of the above-mentioned type is characterized in that the cylinder is of tubular shape, in that the piston is of tubular shape and carries at a dorsal end a guide projection intended to cooperate with the bore internal of the cylinder and directed radially outwards, while the cylinder has at one front end a guide projection intended to cooperate with the external periphery of the piston and directed radially inwards and in that the actuating element penetrates at inside the piston of the receiver and is mounted at one of its ends in an articulated manner on the clutch release fork and at the other of its ends with articulation on the dorsal face of the piston of the hydraulic receiver.
- the operating element is a cable acting between two stops coupled respectively to the dorsal face of the piston and to the clutch release fork.
- the invention is pulled from the piston, by means of a cable connected to the declutching fork or a rod mounted at articulation on the piston and on the declutching fork, to satisfy the differences in kinematics. between the displacement in an arc of the declutching fork and the rectilinear displacement of the piston.
- the receiver cylinder can be fixedly mounted on the counter support, which improves the efficiency of the control since there is no need to compress an elastic bearing as in the prior art.
- the piston is in two parts, namely a tubular part (the piston itself) and the guide projection held together by a preload spring acting on the operating element to urge the fork so that it exerts a preload. on the clutch release bearing.
- the piston is simply made of two materials, one of which is adapted to its guidance.
- the receiver cylinder has a nose by which it is in abutment against its associated counter-abutment. The nose allows easy mounting on its counter support.
- against the support may consist of the sheath stop of a conventional cable control and advantageously the cylinder offers, thanks to its nose, a guide surface for its associated piston.
- the cylinder is closed by an insert on said cylinder (the bottom thereof) so that the 'It is easy to mount the piston and the relevant end of the operating element.
- FIG. 1 is a schematic view of a piston clutch with its declutching fork controlled by a cable
- - Figure 2 is a sectional view of a hydraulic control according to the invention, the upper part of the corresponding figure in the retracted position occupied by the piston when the clutch is disengaged, while the lower part of this figure corresponds to the extraction position occupied by the piston when the clutch is engaged;
- - Figures 3 and 4 are views identical to Figure 2 for other embodiments.
- FIG. 2 which relates by way of nonlimiting example, an application of the invention to a hydraulic circuit for controlling a clutch of a motor vehicle, a master cylinder of this hydraulic circuit.
- the master cylinder 20 comprises a cylinder 22 and a piston 21 slidingly mounted in the cylinder 22 and defining in this cylinder a chamber of variable volume.
- the piston 21 is controlled by control means, here a clutch pedal 24, pivotally mounted on a fixed part 36 of the vehicle.
- This piston 21 is controlled by means of a rod 23 connected to the clutch pedal 24.
- the control means comprise an assistance device interposed between the piston 21 and the clutch pedal 24 and operated by said pedal.
- the master cylinder 20 is connected, in a manner known per se, to a reservoir and constitutes a transmitter connected by a pipe 19 to a hydraulic receiver 1 according to the invention.
- the receiver 1 comprises a cylinder 2 in which a piston 4 is slidably engaged.
- the piston 4 defines in the cylinder 2 a chamber 6 of variable volume, which is connected by an inlet 18 to the pipe 19 and to the master cylinder 20.
- the piston 4 is subjected to the action of a return spring 7 and is adapted to actuate by pulling the release fork 25 of FIG. 1 by means of an operating element 8 capable of acting in traction on the fork of declutching 25 while being articulated on said fork 25 by means of a starting stop 9.
- the operating element 8 is a cable acting in two stops articulated respectively to the piston 4 and to the declutching fork 25. This element is therefore coupled to the piston 4 of the receiver 1 while being mounted, according to a characteristic of the invention, with articulation on the dorsal face of the latter.
- the cylinder 2 is mounted on a counter-support 5 secured to a fixed part of the vehicle, in this case the gearbox casing.
- the cylinder 2 has at its front end a nose 12 penetrating 1 inside its fixed counter-support 5 with a central hole.
- This nose 12 passes through the opening of the counter-support 5 and has a groove for receiving a circlip 13 with the interposition of a washer 14 for distribution between the circlips 13 and the counter-support 15.
- the mounting of the cylinder 2 is carried out easily and this by simple axial threading in the opening of the counter-support 5 and locking using the retaining ring 13.
- the cylinder 2 can thus be mounted in the sheath stop usually present in the gearbox housing for mounting a cable control acting in traction on the clutch release fork.
- the hydraulic control device is mounted in place of a conventional cable control.
- the cylinder 2 is of tubular shape and has a front face delimited by the nose 12 internally bored and a dorsal face closed by a closure cover 3 mounted in a reported manner by snap-fastening, alternatively by screwing, on a tubular body 2 of all in one piece with the nose 12.
- the body 2 of simple shape made of moldable material is advantageously made of plastic with a low coefficient of friction so that the nose 12 internally provides a guide surface for the piston 4.
- the body 2 constituting the cylinder 2 is internally stage and therefore has an internal bore with a change in diameter at its nose 12.
- the piston 4 is tubular in shape and has a tubular part here made of metal 4 guided by the nose 12 at one of its ends (its front end) and by a guide piece 15 at the other of its ends (its dorsal end ).
- the dorsal end of the tube 4 has a radial flange 32 for axial retention of the part 15.
- the part 10 constitutes in a way a plug.
- This plug is hollowed out centrally for mounting an operating stop 11 here of hemispherical shape.
- This stop 11 is fixed to the cable 8 passing through, according to a characteristic of the invention, the piston 4.
- the operating element 8 is therefore, according to the invention, coupled to the rear or dorsal end of the piston 4 via the part 10, by being articulated on said piston 4.
- the stop 11 is therefore engaged with the part 10 cooperating with the dorsal end of the piston 4.
- the cable 8 is fixed to the stop 9 which is also hemispherical in shape.
- the fork 25 is split locally for introduction (mounting) of the cable 8 in a conventional manner.
- the piston 4 Under the action of the load exerted by the diaphragm 27 in FIG. 1, occupies the position shown in the lower part of FIG. 2 with compression of the spring 7.
- the chamber 6 is so from annular in shape being delimited by two concentric parts, namely the piston 4 with its guide part 15 and the cylinder 2. Axially the concentric chamber 6 is therefore closed and delimited by the part 15 and the nose 12. This chamber 6 extends axially on one side with respect to the abutment 5.
- the nose 12 defines inside the cylinder 2 a shoulder 31 and that the inlet 18 of the hydraulic fluid is adjacent to this shoulder 31.
- this spring 7 exerts a preload action on the fork 25 and on the declutching stop 26 in FIG. 1.
- this spring 7 allows the two parts 4 and 15 of the piston to be assembled by being of frustoconical shape. It will be noted that the part 15 is shouldered to receive the collar 32 of the tubular part 4.
- seals 16 and 17 are associated respectively with the guide piece 15 and the shoulder 31 of the nose 12 for sealing the piston 4. Only the seal 16 is axially movable, the seal 17 being carried by the cylinder 2 fixed.
- the cable 8 is therefore hingedly mounted on the piston 4 at the dorsal end thereof.
- the operating element 8 consists of a rod hingedly mounted on the fork 25 and on the dorsal end 32, 10 of the piston 4 closest to the cover 3 thanks to the stops 9, 11.
- the rod therefore crosses the piston 4 while being mounted in an articulated manner on the dorsal face of the piston 4 and the fork 25 by virtue of the maneuvering and attacking stops 9.
- the part 10 constitutes a force transfer part. Preferably it is pierced right through by at least one inclined channel, to evacuate the air.
- the piston 4 carries at its dorsal end a guide projection 15, while the cylinder has at its front end a guide projection 12.
- the guide projection 15 of the piston 4 is directed radially outwards, while the guide projection 12 of the cylinder is directed radially inwards.
- the projection 15 is adapted to cooperate with the internal bore of the cylinder 2, while the projection 12 is adapted to cooperate with the external periphery of the piston 4.
- the seal 16 is implanted on a circumference of diameter greater than that on which the seal 17 is implanted and this is the reason why the spring 7 is of frustoconical shape.
- the nose 12 can be extended at the front by a tube 120 to protect the piston 4 having a guide projection 150 in one piece.
- the cylinder 2 is here made of aluminum and the return spring consists of a simple coil spring 70, the seals 160, 170 being mounted in grooves made respectively at the outer periphery of the guide projection 150 and at the inner periphery of the guide nose 12 of cylinder 2.
- the force transfer part 100 consists of a simple plate of reduced thickness at its outer periphery for support on the dorsal end of the piston
- the plate 100 is centered by the piston 4 with a chamfered end.
- the stop 110 is spherical.
- the protection of the piston can be achieved using a bellows 220 mounted on the nose 12 by interlocking and pinched on the cable 8.
- This cover 3 also has a protective role and prevents the penetration of dirt, impurities or the like inside the cylinder 2. Of course this cover 3 can be mounted by screwing on the cylinder 2.
- the cover 3 facilitates the mounting of the cylinder by being put in place in the end.
- the guide projection 12 of the cylinder 2 is also used for fixing the receiver 1 to the counter support 5 and that the return spring 7.70, usually called the preload spring, is housed in the chamber 6.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9503183 | 1995-03-16 | ||
FR9503183A FR2731755B1 (fr) | 1995-03-16 | 1995-03-16 | Commande hydraulique d'embrayage, notamment pour vehicules automobiles |
PCT/FR1996/000392 WO1996028667A1 (fr) | 1995-03-16 | 1996-03-14 | Commande hydraulique d'embrayage, notamment pour vehicules automobiles |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0764243A1 true EP0764243A1 (fr) | 1997-03-26 |
Family
ID=9477178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96907531A Withdrawn EP0764243A1 (fr) | 1995-03-16 | 1996-03-14 | Commande hydraulique d'embrayage, notamment pour vehicules automobiles |
Country Status (6)
Country | Link |
---|---|
US (1) | US5899309A (fr) |
EP (1) | EP0764243A1 (fr) |
JP (1) | JPH10500476A (fr) |
KR (1) | KR970703497A (fr) |
FR (1) | FR2731755B1 (fr) |
WO (1) | WO1996028667A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19925755A1 (de) * | 1999-06-05 | 2000-12-07 | Volkswagen Ag | Kupplungsbetätigungsvorrichtung |
US6595338B2 (en) | 2001-09-26 | 2003-07-22 | New Venture Gear, Inc. | Torque transfer clutch with linear piston hydraulic clutch actuator |
DE112008002530B4 (de) | 2007-10-15 | 2018-08-02 | Schaeffler Technologies AG & Co. KG | Nehmerzylinder und Ausrücksystem |
DE202011000391U1 (de) * | 2011-02-21 | 2014-03-31 | Hofer Mechatronik Gmbh | Kupplungsbetätiger |
DE102014216104A1 (de) * | 2013-09-20 | 2015-03-26 | Schaeffler Technologies Gmbh & Co. Kg | Nehmerzylinder |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2098674A (en) * | 1931-11-27 | 1937-11-09 | Bendix Aviat Corp | Clutch control mechanism |
US2486787A (en) * | 1946-04-08 | 1949-11-01 | Herbert H Johnson | Piston sleeve protection for brake cylinders |
US3327817A (en) * | 1965-10-15 | 1967-06-27 | Ford Motor Co | Semiautomatic power transmission system for vehicle drivelines |
US3709340A (en) * | 1970-04-27 | 1973-01-09 | Aisin Seiki | Fluid released clutch controlled by engine speed and gear shifter |
JPS52141923A (en) * | 1976-05-20 | 1977-11-26 | Nissan Motor Co Ltd | Automatic clutch |
GB1550613A (en) * | 1976-06-04 | 1979-08-15 | Automotive Prodlucts Ltd | Fluid pressure servo motors |
US5014603A (en) * | 1989-11-02 | 1991-05-14 | Allied-Signal Inc. | Hydraulic actuator having frangible or deformable components |
DE4220020A1 (de) * | 1991-06-28 | 1993-01-07 | Volkswagen Ag | Kupplungsgetriebe |
GB9211921D0 (en) * | 1992-06-05 | 1992-07-15 | Automotive Prod Plc | A clutch actuation system and a cable therefore |
-
1995
- 1995-03-16 FR FR9503183A patent/FR2731755B1/fr not_active Expired - Fee Related
-
1996
- 1996-03-14 JP JP8527340A patent/JPH10500476A/ja active Pending
- 1996-03-14 EP EP96907531A patent/EP0764243A1/fr not_active Withdrawn
- 1996-03-14 US US08/737,610 patent/US5899309A/en not_active Expired - Fee Related
- 1996-03-14 WO PCT/FR1996/000392 patent/WO1996028667A1/fr not_active Application Discontinuation
- 1996-03-14 KR KR1019960706474A patent/KR970703497A/ko not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9628667A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2731755B1 (fr) | 1997-05-16 |
FR2731755A1 (fr) | 1996-09-20 |
JPH10500476A (ja) | 1998-01-13 |
KR970703497A (ko) | 1997-07-03 |
WO1996028667A1 (fr) | 1996-09-19 |
US5899309A (en) | 1999-05-04 |
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Legal Events
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Effective date: 20010807 |