WO1992001874A1 - A friction clutch - Google Patents

A friction clutch Download PDF

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Publication number
WO1992001874A1
WO1992001874A1 PCT/GB1991/000769 GB9100769W WO9201874A1 WO 1992001874 A1 WO1992001874 A1 WO 1992001874A1 GB 9100769 W GB9100769 W GB 9100769W WO 9201874 A1 WO9201874 A1 WO 9201874A1
Authority
WO
WIPO (PCT)
Prior art keywords
drive shaft
friction clutch
clutch assembly
shaft member
assembly according
Prior art date
Application number
PCT/GB1991/000769
Other languages
French (fr)
Inventor
Richard David Maitland Cooke
Robert John Murphy
Original Assignee
Automotive Products Plc
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
Priority claimed from GB909015678A external-priority patent/GB9015678D0/en
Priority claimed from GB909023917A external-priority patent/GB9023917D0/en
Application filed by Automotive Products Plc filed Critical Automotive Products Plc
Publication of WO1992001874A1 publication Critical patent/WO1992001874A1/en
Priority to GB9223664A priority Critical patent/GB2260383B/en

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
    • F16D25/082—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member the line of action of the fluid-actuated members co-inciding with the axis of rotation
    • F16D25/085—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member the line of action of the fluid-actuated members co-inciding with the axis of rotation the clutch actuation being of the pull type

Definitions

  • the present invention relates to a friction clutch suitable for use in a motor vehicle.
  • a known friction clutch is disclosed in GB2 147 668 and comprises a flywheel with a cover mounted thereon, a pressure olate fixed in rotation with the flywheel and cover, and a driven plate interspaced between the flywheel and pressure plate and adapted to be mounted on a drive shaft which forms an input to a gear box.
  • a diaphragm spring acts between the cover and the pressure plate to engage the clutch and actuation means in the form of a concentric slave cylinder acts between the cover and the diaphragm spring to disengage the clutch.
  • Such a clutch cannot be supplied as a single unit because, until it is mounted on a drive shaft, the driven plate is separate from the rest of the assembly.
  • the present invention aims to provide a clutch which is compact and can be supplied as a unit.
  • the present invention provides a friction clutch assembly comprising a drive shaft member rotatable about an axis, a driven member mounted on the drive shaft member, a drive member rotatable about the axis relative to the driven member, biasing means for urging the drive member and the driven member together to cause clutch engagement, and actuation means acting between the drive shaft member and the biasing means to cause clutch disengagement.
  • the drive member may include a flywheel, preferably with a pressure plate movable axially relative thereto.
  • the drive member may also include a cover which preferably provides a fulcrum about which the biasing means can pivot.
  • the actuation means is preferably hydraulically operated and may ' include a piston and a cylinder, which may both be annular.
  • the piston and cylinder are concentric with the drive shaft.
  • the drive shaft member preferably has an abutment, which is conveniently in the form of an annular ridge, for restricting axial movement of the piston in one direction relative to the drive shaft member.
  • the annular ridge preferably forms one race of one of - pair of bearings which allow the drive shaft member to rotate relative to the piston and cylinder.
  • the drive shaft member has coupling means for coupling it to a drive shaft.
  • the couoling means is desirably in the form of splines which may be in a longitudinal bore in the drive shaft member or on the outer surface of the drive shaft member.
  • Fig 1 is a section through a friction clutch assembly according to a first embodiment of the invention
  • FIG. 1 is an enlargement of part of Fig 1;
  • Fig 3 is a section through part of a friction clutch assembly according to a second embodiment of the invention
  • Fig 4 is a section through a friction clutch assembly according to a third embodiment of the invention.
  • Fig 5 is a section on Line V - V of Fig 4.
  • a clutch assembly 10 comprises a drive member 12 and a driven member 14.
  • the drive member comprises a flywheel 16 bolted onto a flange 18 of a crankshaft (not shown) , a cover 20 which is attached to the flywheel 18 by bolts 22, and a pressure plate 24 which is held rotationally fast with the cover by drive straps 26.
  • a diaphragm spring 28 forms biasing means acting between the cover 20 and the pressure plate 24 to urge the pressure plate towards the flywheel 16.
  • the diaphragm spring 28 comprises an outer annular portion 30 and inwardly extending spring fingers 32. Some of the spring fingers 32 extend out of the plane of the annular portion 30 towards the pressure plate 24, forming a plurality of spring tabs 34.
  • the diaphragm spring 28 is connected to actuation means 36.
  • the actuation means comprises a release plate 38 and a hydraulic slave cylinder 40 which are joined by a release bearing 42 which allows them to rotate relative to one another.
  • the release plate 38 comprises an inner annular portion 44 and outwardly extending tags 46.
  • the tags 46 extend axially between the spring tabs 34 and the remaining spring fingers 32, and are secured in place by a wire ring 48.
  • the release bearing 42 has an inner race 50 and an outer race 52.
  • the outer race 52 has a circumferential radially extending flange 54 and a circumferential groove 56.
  • the inner annular portion 44 of the release plate is held against the flange 54 by a circlip 58, which rests in the groove 56, and a Belleville washer 60.
  • the slave cylinder 40 comprises an annular cylinder body 62 and an annular piston 64 axially slidable therein.
  • the cylinder body 62 and piston 64 are of plastics, but could be of any other suitable metallic or non metallic material.
  • the cylinder body 62 and piston 64 define a chamber 66 therebetween and the cylinder body 62 defines a hydraulic fluid inlet 68 to the chamber 66. Seals 70 prevent the escape of fluid between the cylinder body 62 and the piston 64.
  • the cylinder body 62 has a ci cumferential radially extending flange 72 and a circumferential groove 74.
  • the inner race 52 of the release bearing fits around the cylinder 62 and is held against the flange 72 by a circlip 76 which fits in the groove 74.
  • a drive shaft member 80 has one end 82 mounted in a bearing 84 in the flywheel 16.
  • a shoulder 85 on the drive shaft prevents movement of the drive shaft towards the flywheel 16.
  • a circumferential ridge 86 on the drive shaft member 80 forms the inner race of a drive shaft bearing 88, the outer race 90 of which fits inside the piston 64.
  • An abutment surface 90 on the piston 64 prevents the piston from moving towrds the flywheel 16.
  • the driven member 14 comprises a driven plate 94 mounted on a hub 96.
  • the hub 96 is mounted on splines 98 on the drive shaft member 80 so that it is rotationally fast with the drive shaft member but can slide axially along it.
  • the drive shaft member 80 is removably coupled to a drive shaft 100 by coupling means which comprises an axial bore 102 in the drive shaft member with internal splines 104. External splines 106 on the drive shaft 100 engage the internal splines 104.
  • Figures 1 and 2 show the clutch in an engaged position, the diaphragm spring 28 urging the pressure plate 24 towards the flywheel 18 to clamp the driven plate.
  • a release bearing has two annular grooves 174, a circlip 176 being located in each.
  • a release plate 138 is held between the two circlips 176 by a Belleville washer 160.
  • the drive shaft member 180 has an annular groove 185 having a circlip 186 located in it.
  • the drive shaft bearing 188 rests against the circlip 186, which prevents axial movement of the drive shaft bearing when the clutch is disengaged.
  • the third embodiment of the invention is similar to the first embodiment, like parts having designated by like numerals preceded by 2. The differences in the third embodiment are described below.
  • a drive shaft 200 has a drive shaft member in the form of a sleeve member 283 removably mounted on one end.
  • the drive shaft 200 has a plurality of axially extending splines 285 and the sleeve member 283 fits around the drive shaft 200, held rotationally fast therewith by the splines 285.
  • the sleeve member has axially extending grooves 286.
  • a shoulder 287 on the sleeve member abuts the bearing 284 and prevents the sleeve member from moving axially towards the flywheel 216.
  • the sleeve member 283 has one end 282 which extends beyond the end of the drive shaft 200 and is mounted in a bearing 284 in the flywheel 216.
  • the end of the drive shaft 200 is therefore located on its axis of rotation by the sleeve member 283.
  • the other end 284 of the sleeve member 283 forms a bearing support 288 in which rests a drive shaft bearing 290.
  • the drive shaft bearing 290 supports the slave cylinder 240.
  • the driven member 214 comprises a driven plate 294 mounted on a hub 296.
  • Spl;ines 298 on the hub 296 engage the grooves 286 in the sleeve member so that it is rotationally fast with the sleeve member but can slide axially along it.
  • Drive is transmitted from the hub 296 to the shaft member 281 through the sleeve member 283.

Abstract

A friction clutch for a motor vehicle has flywheel (16), a cover (20), a diaphragm spring (30) and a pressure plate (24). A drive shaft member (80) has a driven plate (14) mounted on it and has a ridge (86) which forms the inner race of a bearing (88). A slave cylinder (40) comprising a cylinder body (62) and a piston (64) acts between the bearing (88) on the drive shaft member (80) and the diaphragm spring (30) to release the clutch.

Description

A FRICTION CLUTCH
The present invention relates to a friction clutch suitable for use in a motor vehicle.
A known friction clutch is disclosed in GB2 147 668 and comprises a flywheel with a cover mounted thereon, a pressure olate fixed in rotation with the flywheel and cover, and a driven plate interspaced between the flywheel and pressure plate and adapted to be mounted on a drive shaft which forms an input to a gear box.
A diaphragm spring acts between the cover and the pressure plate to engage the clutch and actuation means in the form of a concentric slave cylinder acts between the cover and the diaphragm spring to disengage the clutch.
Such a clutch cannot be supplied as a single unit because, until it is mounted on a drive shaft, the driven plate is separate from the rest of the assembly.
The present invention aims to provide a clutch which is compact and can be supplied as a unit. The present invention provides a friction clutch assembly comprising a drive shaft member rotatable about an axis, a driven member mounted on the drive shaft member, a drive member rotatable about the axis relative to the driven member, biasing means for urging the drive member and the driven member together to cause clutch engagement, and actuation means acting between the drive shaft member and the biasing means to cause clutch disengagement.
The drive member may include a flywheel, preferably with a pressure plate movable axially relative thereto. The drive member may also include a cover which preferably provides a fulcrum about which the biasing means can pivot.
The actuation means is preferably hydraulically operated and may' include a piston and a cylinder, which may both be annular. Advantageously the piston and cylinder are concentric with the drive shaft.
The drive shaft member preferably has an abutment, which is conveniently in the form of an annular ridge, for restricting axial movement of the piston in one direction relative to the drive shaft member. The annular ridge preferably forms one race of one of - pair of bearings which allow the drive shaft member to rotate relative to the piston and cylinder.
Preferably the drive shaft member has coupling means for coupling it to a drive shaft. The couoling means is desirably in the form of splines which may be in a longitudinal bore in the drive shaft member or on the outer surface of the drive shaft member.
Preferred embodiments of the invention will now be described by way of example only with reference to the accompanying drawings in which:-
Fig 1 is a section through a friction clutch assembly according to a first embodiment of the invention;
Fig 2 is an enlargement of part of Fig 1;
Fig 3 is a section through part of a friction clutch assembly according to a second embodiment of the invention; Fig 4 is a section through a friction clutch assembly according to a third embodiment of the invention; and
Fig 5 is a section on Line V - V of Fig 4.
Referring to Figs 1 and 2, a clutch assembly 10 comprises a drive member 12 and a driven member 14. The drive member comprises a flywheel 16 bolted onto a flange 18 of a crankshaft (not shown) , a cover 20 which is attached to the flywheel 18 by bolts 22, and a pressure plate 24 which is held rotationally fast with the cover by drive straps 26.
A diaphragm spring 28 forms biasing means acting between the cover 20 and the pressure plate 24 to urge the pressure plate towards the flywheel 16. The diaphragm spring 28 comprises an outer annular portion 30 and inwardly extending spring fingers 32. Some of the spring fingers 32 extend out of the plane of the annular portion 30 towards the pressure plate 24, forming a plurality of spring tabs 34. The diaphragm spring 28 is connected to actuation means 36. The actuation means comprises a release plate 38 and a hydraulic slave cylinder 40 which are joined by a release bearing 42 which allows them to rotate relative to one another. The release plate 38 comprises an inner annular portion 44 and outwardly extending tags 46. The tags 46 extend axially between the spring tabs 34 and the remaining spring fingers 32, and are secured in place by a wire ring 48. The release bearing 42 has an inner race 50 and an outer race 52. The outer race 52 has a circumferential radially extending flange 54 and a circumferential groove 56.
The inner annular portion 44 of the release plate is held against the flange 54 by a circlip 58, which rests in the groove 56, and a Belleville washer 60. The slave cylinder 40 comprises an annular cylinder body 62 and an annular piston 64 axially slidable therein. The cylinder body 62 and piston 64 are of plastics, but could be of any other suitable metallic or non metallic material. The cylinder body 62 and piston 64 define a chamber 66 therebetween and the cylinder body 62 defines a hydraulic fluid inlet 68 to the chamber 66. Seals 70 prevent the escape of fluid between the cylinder body 62 and the piston 64. The cylinder body 62 has a ci cumferential radially extending flange 72 and a circumferential groove 74. The inner race 52 of the release bearing fits around the cylinder 62 and is held against the flange 72 by a circlip 76 which fits in the groove 74.
A drive shaft member 80 has one end 82 mounted in a bearing 84 in the flywheel 16. A shoulder 85 on the drive shaft prevents movement of the drive shaft towards the flywheel 16. A circumferential ridge 86 on the drive shaft member 80 forms the inner race of a drive shaft bearing 88, the outer race 90 of which fits inside the piston 64. An abutment surface 90 on the piston 64 prevents the piston from moving towrds the flywheel 16.
The driven member 14 comprises a driven plate 94 mounted on a hub 96. The hub 96 is mounted on splines 98 on the drive shaft member 80 so that it is rotationally fast with the drive shaft member but can slide axially along it. The drive shaft member 80 is removably coupled to a drive shaft 100 by coupling means which comprises an axial bore 102 in the drive shaft member with internal splines 104. External splines 106 on the drive shaft 100 engage the internal splines 104.
Figures 1 and 2 show the clutch in an engaged position, the diaphragm spring 28 urging the pressure plate 24 towards the flywheel 18 to clamp the driven plate.
To disengage the clutch fluid is forced through the fluid inlet 68 into the chamber 66. This moves the cylinder body 62, the release bearing 42, the release plate 38 and the spring fingers 32 away from the flywheel 18, so that the clutch is released.
Referring to Fig 3, in the second embodiment of the invention, a release bearing has two annular grooves 174, a circlip 176 being located in each. A release plate 138 is held between the two circlips 176 by a Belleville washer 160. The drive shaft member 180 has an annular groove 185 having a circlip 186 located in it. The drive shaft bearing 188 rests against the circlip 186, which prevents axial movement of the drive shaft bearing when the clutch is disengaged.
Referring to Fig 4, the third embodiment of the invention is similar to the first embodiment, like parts having designated by like numerals preceded by 2. The differences in the third embodiment are described below.
A drive shaft 200 has a drive shaft member in the form of a sleeve member 283 removably mounted on one end. The drive shaft 200 has a plurality of axially extending splines 285 and the sleeve member 283 fits around the drive shaft 200, held rotationally fast therewith by the splines 285. The sleeve member has axially extending grooves 286. A shoulder 287 on the sleeve member abuts the bearing 284 and prevents the sleeve member from moving axially towards the flywheel 216. Another shoulder 289 on the sleeve member 283 abuts one end of the splines 285 on the drive shaft 200 to prevent the sleeve member from moving away from the flywheel. The sleeve member 283 has one end 282 which extends beyond the end of the drive shaft 200 and is mounted in a bearing 284 in the flywheel 216. The end of the drive shaft 200 is therefore located on its axis of rotation by the sleeve member 283. The other end 284 of the sleeve member 283 forms a bearing support 288 in which rests a drive shaft bearing 290. The drive shaft bearing 290 supports the slave cylinder 240.
The driven member 214 comprises a driven plate 294 mounted on a hub 296. Spl;ines 298 on the hub 296 engage the grooves 286 in the sleeve member so that it is rotationally fast with the sleeve member but can slide axially along it. Drive is transmitted from the hub 296 to the shaft member 281 through the sleeve member 283.

Claims

C AIMS
1) A friction clutch assembly comprising a drive shaft member rotatable about an axis, a driven member mounted on the drive shaft, a drive member rotatable about the axis, biasing means for urging the drive member and the driven member together to cause clutch engagement, and actuation means for causing clutch disengagement characterised in that the actuation means acts between the drive shaft member and the biasing means.
2) A friction clutch assembly according to Claim 1 characterised in that the actuation means is rotatably connected to the drive shaft member.
3) A friction clutch assembly according to Claim 1 or Claim 2 characterised in that the drive shaft member has an abutment means for restricting axial movement of the actuation means in one direction relative to the drive shaft member. 4) A friction clutch assembly according to Claim 3 characterised in that the abutment means comprises an annular ridge.
5) A friction clutch assembly according to Claim 4 characterised in that the annular ridge forms one race of one of the bearings which supports the actuation means.
6) A friction clutch assembly according to Claim 4 wherein the abutment means comprises a recess in the drive shaft member with an abutment member therein.
7) A friction clutch assembly according to any foregoing claim wherein the driveshaft member comprises a sleeve.
8) A friction clutch assembly according to any foregoing claim wherein the drive shaft member has a shoulder for locating it axially with respect to the flywheel.
9) A friction clutch assembly according to any foregoing claim wherein the drive shaft member is adapted to be removably mounted on a driveshaft.
10) A friction clutch assembly substantially as hereinbefore described with reference to the accompanying drawings.
PCT/GB1991/000769 1990-07-17 1991-05-16 A friction clutch WO1992001874A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9223664A GB2260383B (en) 1990-07-17 1992-11-11 A friction clutch

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9015678.7 1990-07-17
GB909015678A GB9015678D0 (en) 1990-07-17 1990-07-17 A friction clutch
GB909023917A GB9023917D0 (en) 1990-11-02 1990-11-02 A friction clutch
GB9023917.9 1990-11-02

Publications (1)

Publication Number Publication Date
WO1992001874A1 true WO1992001874A1 (en) 1992-02-06

Family

ID=26297336

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/000769 WO1992001874A1 (en) 1990-07-17 1991-05-16 A friction clutch

Country Status (1)

Country Link
WO (1) WO1992001874A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5273145A (en) * 1991-06-27 1993-12-28 Valeo Hydraulic clutch control means, in particular for a motor vehicle
WO1994007047A1 (en) * 1992-09-17 1994-03-31 Automotive Products France S.A. A clutch release apparatus
GB2272742A (en) * 1992-11-10 1994-05-25 Automotive Prod France A compact hydraulic clutch slave cylinder with release bearing
WO1999064759A1 (en) * 1998-06-06 1999-12-16 Automotive Products Plc Clutches

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR765330A (en) * 1933-12-09 1934-06-08 Ets Baudet Donon & Roussel Pneumatic clutch control device
FR1518335A (en) * 1967-04-10 1968-03-22 Schottel Werft Lamellar coupling as well as a mechanism equipped with said coupling or the like
FR1521148A (en) * 1967-04-28 1968-04-12 Coventry Gauge & Tool Co Ltd Pressurized fluid actuated mechanism for controlling a multiple-plate clutch
GB1415749A (en) * 1973-07-13 1975-11-26 Horton Mfg Co Inc Clutches
FR2301731A1 (en) * 1975-02-24 1976-09-17 Rexroth Sigma Hydraulically operated friction clutch - has spring actuated brake to eliminate residual couple in driven shaft
FR2547003A1 (en) * 1983-06-01 1984-12-07 Gourlaouen Jean Marie Fan engagement device, especially for the cooling circuit of an internal combustion engine and device for controlling such an engagement device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR765330A (en) * 1933-12-09 1934-06-08 Ets Baudet Donon & Roussel Pneumatic clutch control device
FR1518335A (en) * 1967-04-10 1968-03-22 Schottel Werft Lamellar coupling as well as a mechanism equipped with said coupling or the like
FR1521148A (en) * 1967-04-28 1968-04-12 Coventry Gauge & Tool Co Ltd Pressurized fluid actuated mechanism for controlling a multiple-plate clutch
GB1415749A (en) * 1973-07-13 1975-11-26 Horton Mfg Co Inc Clutches
FR2301731A1 (en) * 1975-02-24 1976-09-17 Rexroth Sigma Hydraulically operated friction clutch - has spring actuated brake to eliminate residual couple in driven shaft
FR2547003A1 (en) * 1983-06-01 1984-12-07 Gourlaouen Jean Marie Fan engagement device, especially for the cooling circuit of an internal combustion engine and device for controlling such an engagement device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5273145A (en) * 1991-06-27 1993-12-28 Valeo Hydraulic clutch control means, in particular for a motor vehicle
WO1994007047A1 (en) * 1992-09-17 1994-03-31 Automotive Products France S.A. A clutch release apparatus
GB2276693A (en) * 1992-09-17 1994-10-05 Automotive Prod France A clutch release apparatus
GB2276693B (en) * 1992-09-17 1996-05-08 Automotive Prod France A clutch release apparatus
GB2272742A (en) * 1992-11-10 1994-05-25 Automotive Prod France A compact hydraulic clutch slave cylinder with release bearing
GB2272742B (en) * 1992-11-10 1995-09-20 Automotive Prod France A clutch slave cylinder
WO1999064759A1 (en) * 1998-06-06 1999-12-16 Automotive Products Plc Clutches
GB2341904A (en) * 1998-06-06 2000-03-29 Automotive Products Uk Ltd Clutches
GB2341904B (en) * 1998-06-06 2002-11-13 Automotive Products Uk Ltd Clutches

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