Dual clutch

Abstract

The invention relates to a duplex clutch for coupling a drive shaft of a motor vehicle engine to a first transmission input shaft and/or a second transmission input shaft of a motor vehicle transmission, including a first partial clutch for coupling the drive shaft to the first transmission input shaft. A second partial clutch couples the drive shaft to the second transmission input shaft. A first actuating cup displaces a first compression plate of the first partial clutch and a second actuating cup displaces a second compression plate of the second partial clutch.

Claims

1. A duplex clutch for coupling a drive shaft of a motor vehicle to at least one of a first transmission input shaft or a second transmission input shaft of a motor vehicle transmission, the duplex clutch comprising: a first partial clutch for coupling the drive shaft to the first transmission input shaft, with the first partial clutch comprising a first counter plate, at least one first intermediate plate axially displaceable in reference to the first counter plate, and a first compression plate axially displaceable in reference to the first counter plate and to the first intermediate plate for compressing first friction linings of a first clutch disk between the first counter plate and the first intermediate plate as well as between the first intermediate plate and the first compression plate; a second partial clutch for coupling the drive shaft to the second transmission input shaft, with the second partial clutch comprising a second counter plate, at least one second intermediate plate axially displaceable in reference to the second counter plate, and a second compression plate axially displaceable in reference to the second counter plate and to the second intermediate plate for compressing second friction linings of a second clutch disk between the second counter plate and the second intermediate plate as well as between the second intermediate plate and the second compression plate; a first actuating cup for displacement of the first compression plate; and a second actuating cup, embodied stiffly, for the displacement of the second compression plate, wherein the first and second partial clutches are actuated directly without any lever movements, and the first actuating cup engages the first compression plate without any pivotal motion, and the second actuating cup engages the second compression plate without any pivotal motion.

2. The duplex clutch according to claim 1, wherein at least one of the first clutch disk is connectable to the first transmission input shaft in a torque-transmitting fashion, with the first clutch disk comprising a first torsional vibration damper for the first friction lining between the first counter plate and the first intermediate plate as well as for the first friction lining between the first intermediate plate and the first compression plate, or the second clutch disk is connectable in a torque-transmitting fashion to the second transmission input shaft, with the second clutch disk comprising a second torsional vibration damper for the second friction lining between the second counter plate and the second intermediate plate as well as for the second friction lining between the second intermediate plate and the second compression plate.

3. The duplex clutch according to claim 1, wherein a clutch cover, connected to the first counter plate and the second counter plate, is provided for covering at least a portion of at least one of the first partial clutch or the second partial clutch, and the clutch cover is fastenable at a fastening site with at least one of the first counter plate or the second counter plate.

4. The duplex clutch according to claim 1, further comprising an actuating system for applying an actuating force upon at least one of the first actuating cup or the second actuating cup, with the actuating system being supported to transfer loads.

5. The duplex clutch according to claim 1, further comprising a spring element for a torque-proof fastening to the drive shaft with the spring element being connected to at least one of the first counter plate or to the second counter plate for introducing a torque provided by the drive shaft.

6. The duplex clutch according to claim 1, further comprising a support stop for supporting actuating forces acting in an axial direction upon the drive shaft, with the first counter plate being at least one of axially mobile or tippable in reference to the drive shaft, and the support stop is formed on at least one of the drive shaft or a component connected to the drive shaft or to the first counter plate.

7. The duplex clutch according to claim 1, wherein the first counter plate and the second counter plate are formed by a common central plate.

8. The duplex clutch according to claim 1, wherein at least one of the first counter plate or the second counter plate are supported via a support bearing on the at least one of the first transmission input shaft or the second transmission input shaft for transferring at least one of radial forces or axial forces.

9. The duplex clutch according to claim 8, wherein the second counter plate is connected via a radially acting compensation for slide offset to the support bearing via an axial bearing.

10. The duplex clutch according to claim 1, further comprising a torsional vibration damper connected to at least one of the first counter plate or the second counter plate for damping torsional vibrations introduced via the drive shaft, with the torsional vibration damper comprising at least one access opening for passing a fastening element, connecting the torsional vibration damper to the at least one of the first counter plate to the second counter plate, or at least one of the at least one of first counter plate or the second counter plate comprising an assembly opening for guiding through a connection element connecting the torsional vibration damper to the drive shaft, or at least one of the first clutch disk, the second clutch disk, or the second actuating cup comprising an assembly opening for guiding through a connection element for connecting the torsional vibration damper to the drive shaft, or a combination thereof.

11. The duplex clutch according to claim 1, wherein for transferring at least one of radial forces or axial forces the first counter plate rests on at least one of the drive shaft or a torsional vibration damper for damping torsional vibrations introduced via the drive shaft.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following, as an example the invention is explained with reference to the attached drawings based on preferred exemplary embodiments, with each of the features illustrated in the following representing an aspect of the invention, either by itself or in combination with others. Shown are:

(2) FIG. 1: a schematic cross-section of a duplex clutch in a first embodiment,

(3) FIG. 2: a schematic cross-section of a duplex clutch in a second embodiment,

(4) FIG. 3: a schematic cross-section of a duplex clutch in a third embodiment,

(5) FIG. 4: a schematic cross-section of a duplex clutch in a fourth embodiment,

(6) FIG. 5: a schematic cross-section of a duplex clutch in a fifth embodiment,

(7) FIG. 6: a schematic cross-section of a duplex clutch in a sixth embodiment,

(8) FIG. 7: a schematic cross-section of a duplex clutch in a seventh embodiment,

(9) FIG. 8: a schematic cross-section of a duplex clutch in a eighth embodiment,

(10) FIG. 9: a schematic cross-section of a duplex clutch in a ninth embodiment,

(11) FIG. 10: a schematic cross-section of a duplex clutch in a tenth embodiment,

(12) FIG. 11: a schematic cross-section of a duplex clutch in an eleventh embodiment,

(13) FIG. 12: a schematic cross-section of a duplex clutch in a twelfth embodiment,

(14) FIG. 13: a schematic cross-section of a duplex clutch in a thirteenth embodiment,

(15) FIG. 14: a schematic cross-section of a duplex clutch in a fourteenth embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(16) The duplex clutch 10 shown in FIG. 1 comprises a first partial clutch 12 for coupling a drive shaft 14 to a first transmission input shaft 16 and a second partial clutch 18 for coupling the drive shaft 14 to a second transmission input shaft 20 arranged concentrically in reference to the first transmission input shaft 16. The first partial clutch 12 comprises a first counter plate 22 and a first compression plate 24 axially displaceable in reference to the first counter plate 22. A first intermediate plate 26, axially displaceable, is provided between the first counter plate 22 and the first compression plate 24. First friction linings 28 of a first clutch disk 30, respectively axially displaceable in reference to each other, are provided between the first counter plate 22 and the first intermediate plate 26 as well as between the first intermediate plate 26 and the first compression plate 24. The first clutch disk 30 is connected in a torque-transmitting fashion to the first transmission input shaft 16. The second partial clutch 18 comprises a second counter plate 34 and a second compression plate 36, which is axially displaceable in reference to the second counter plate 34. An axially displaceable second intermediate plate 38 is provided between the second counter plate 34 and the second compression plate 36. Second friction linings 40 of a second clutch disk 42, each axially displaceable in reference to each other, are provided between the second compression plate 36 and the second intermediate plate 38 as well as between the second intermediate plate 38 and the second counter plate 34. The second clutch disk 42 is connected via a second disk damper 44 to the second transmission input shaft 20 in a torque-transmitting fashion. In the exemplary embodiment shown the first counter plate 22 and the second counter plate 34 are embodied by a common central plate 46 such that a five plate design develops.

(17) A clutch cover 48 is connected to the central plate 46 and thus to the first counter plate 22 and the second counter plate 34, which clutch cover is connected via the cap bearing 50 to an actuating system 52. The first compression plate 24 can be axially displaced by the actuating system 52 using a first actuating cup 54 in order to compress in a friction-fitting fashion the first friction linings 28 of the first clutch disk 30 and this way engages the first partial clutch 12, or to release a friction-fitting connection of the first friction linings 28 of the first clutch disk 30 and this way opens the first partial clutch 12. In this exemplary embodiment the first actuating cup 54 is embodied as a tensile element 56. The second compression plate 36 can be axially displaced by the actuating system 52 using a second actuating cup 58 in order to compress in a friction-fitting fashion the second friction linings 40 of the second clutch disk 42 and this way engages the second partial clutch 18 or to open a friction-fitting connection of the two friction linings 40 of the second clutch disk 42 and this way opens the first partial clutch 18. The alignments of actuation for engaging the first partial clutch 12 and the second partial clutch 18 are arranged in opposite axial directions. The two actuating cups 54, 58 are essentially embodied in a stiff fashion, thus allowing the avoidance of pivotal motions of the actuating cups 54, 58. Accordingly, an actuating motion of the actuating system 52 can essentially be transferred via the actuating cups 54, 58 without amplification and without loss to the compression plates 24, 36.

(18) In the exemplary embodiment shown the central plates 46 are connected via an entraining ring 60 and a torsional vibration damper 62, embodied as a two-weight flywheel, to the drive shaft 14. The torsional vibration damper 62 has a primary weight 66 connected to the drive shaft 14 via connection means 64 embodied as a screw, which weight via an energy storage element 68, embodied as an arc spring, is coupled in a limitedly rotational fashion to a secondary weight 70 embodied as an outlet flange. A receiving channel is embodied in the primary weight 66 for the energy storage element 68, into which the secondary weight 70 penetrates radially inwardly. Further, a gear rim 72 is connected to the primary weigh 66 for introducing a starting torque to start the engine of the motor vehicle. An access opening 74 is provided in the primary weight 66 of the torsional vibration damper 62 through which the fastening means 76, embodied as a screw, can be guided in order to screw the secondary weight 70 to the entraining ring 60.

(19) Any forces developing in the duplex clutch by the fixed connection of the central plate 46 to the torsional vibration damper 62 can be transferred via the drive shaft 14. Additionally or alternatively the central plate 46 and thus the first counter plate 22 and the second counter plate 34 can be supported via a support bearing 78 at the exterior second transmission input shaft 20 or alternatively at the interior first transmission input shaft 16 to transfer axial forces and/or radial forces. Additionally or alternatively here axial tension can be avoided by axial elasticity in the torsional vibration damper 62 and/or the entraining ring 60 when the duplex clutch 10 is fastened at the transmission side and the torsional vibration damper 62 at the driving side.

(20) An actuating force for displacing the first actuating cup 54 and/or the second actuating cup 58 can be applied by the actuating system 52. In this exemplary embodiment the actuating system 52 comprises a first ring cylinder 80 and a second ring cylinder 82 arranged coaxially in reference to the first ring cylinder 80. The actuating system 52 is therefore embodied as CSC (concentric slave cylinder). The two ring cylinders 80, 82 are arranged in opposite directions. A first actuating piston 84 is axially guided in the first ring cylinder 80, and engages the first actuating cup 54 via a first release bearing 86. This way the first actuating cup 54 can be operated by the actuating system 52. A second actuating piston 88 is guided in the second ring cylinder 82, engaging the second actuating cup 58 via a second release bearing 90. This way the second actuating cup 58 can be operated by the actuating system 52. In the exemplary embodiment shown the actuating system 52 is connected via a flex plate 92 to the transmission housing 94. The flex plate 92 serves as the torque support and torque proofing means for the actuator system 52 and is therefore embodied elastically in the radial direction.

(21) In the embodiment of the duplex clutch 10 shown in FIG. 2, compared to the embodiment of the duplex clutch 10 shown in FIG. 1, the entraining ring 60 is supported via a slide bearing 96 on the drive shaft 14. The slide bearing 96 can transfer axial and/or radial forces. For this purpose a spacer 98 carrying the slide bearing 96 is fastened by the connection means 64 provided at the drive shaft 14. The fastening means 76, connecting the secondary weight 70 to the entraining ring 60, are embodied as a rivet connection so that the torsional vibration damper 62 can be provided preassembled with the remaining duplex clutch 10. Additionally, the access opening 74 in the primary weight 66 can be waived. In order to assemble the duplex clutch 10 at the drive shaft 14 here an assembly opening 100 is provided in the entraining ring through which the connection means 64 can be guided during the assembly process. In the exemplary embodiment shown, neither the first counter plate 22 nor the second counter plate 34 rest on any of the transmission input shafts 16, 20. During the assembly of the duplex clutch 10 initially the torsional vibration damper 62 can be assembled to the drive shaft 14, with the entraining ring 60 already being preassembled with the torsional vibration damper 62. Subsequently the remaining duplex clutch 10 can be connected to the entraining ring 60. For this purpose a threaded connection is provided between the entraining ring 60 and one of the counter plates 22, 34. Assembly openings 100 in the clutch disks 30, 42 and/or the counter plates 22, 34 are not required in this case. In this exemplary embodiment not only the second clutch disk 42 is connected via a second disk damper 44 to the second transmission input shaft 20 in at torque-proof fashion, but the first clutch disk 30 is also connected via a first disk damper 32 to the first transmission input shaft 16 in a torque-transmitting fashion. This allows damping of any rotary inconsistencies occurring in the torque introduced via the drive shaft 14 by the first disk damper 32 of the first clutch disk 30 and/or by the second disk damper 44 of the second clutch disk 42. Any rotary inconsistencies can also be damped in the torsion vibration damper 62.

(22) As shown in FIG. 3, compared to the embodiment of the duplex clutch 10 shown in FIG. 1 or 2, the first counter plate 22 and the second counter plate 34 can be embodied as separate components, spaced apart from each other in the axial direction such that a six plate design results. The alignment of actuation for engaging the first partial clutch 12 and the second partial clutch 18 show the same axial directions. Upon the first partial clutch 12 engaging, here the first actuating cup 54 is subjected to pressure.

(23) The first counter plate 22 and the second counter plate 34 are connected to the clutch cover 48, which is connected via a cap bearing 50 to the actuator system 52, causing the actuator system 52 to be fastened to the clutch cover 48. The actuating system 52 comprises a first ring cylinder 80 and a second ring cylinder 82 arranged coaxially in reference to the first ring cylinder 80. The actuating system 52 is therefore embodied as a CSC (concentric slave cylinder). In this exemplary embodiment the two ring cylinders 80, 82 are aligned in the same direction. A first actuating piston 84 is axially guided in the first ring cylinder 80, engaging the first actuating cup 54 via a first release bearing 86. This way the first actuating cup 54 can be operated by the actuating system 52. A second actuating piston 88 is axially guided in the second ring cylinder 82 engaging the second actuator cup 58 via a second release bearing 90. This way the second actuator cup 58 can be operated by the actuating system 52. The actuating system 52 is embodied as a CSC (concentric slave cylinder). As shown in FIG. 3, the first clutch disk 30 is connected via a first disk damper 32 to the first transmission input shaft 16 in a torque-transmitting fashion. The second clutch disk 42 is connected to the second transmission input shaft 20 in a torque-transmitting fashion.

(24) In this exemplary embodiment assembly openings 100 are provided in the first clutch disk 30 and in the second clutch disk 42 as well as in the second actuating cup 58 for passing the connection means 64 through them during the assembly process. This way the torsional vibration damper 62 can be connected in the preassembled state to the remaining duplex clutch 10, jointly with the drive shaft 14. Further, the first counter plate 22 rests via a roller bearing 102 on the drive shaft 14, by which particularly radial forces and axial forces can be transferred. Further, the first transmission input shaft 16 rests via a pilot bearing 91 on the drive shaft 14.

(25) In the embodiment of the duplex clutch 10 shown in FIG. 4, compared to the embodiment of the duplex clutch 10 shown in FIG. 3, the clutch cover 48 is waived. In this exemplary embodiment the actuating system 52 is fastened directly at the transmission housing 94.

(26) Compared to the embodiment shown in FIG. 4, in the exemplary embodiment shown in FIG. 5 the actuating system 52 is not connected to the transmission housing 84 but rests via a bearing 104 on the second transmission input shaft 20 for transferring radial forces and/or axial forces. Further, the second transmission input shaft 20 may be supported via a journal bearing 106 embodied as a needle bearing on the first transmission input shaft 16. Any unintentional rotation of the actuating system 52 can be prevented by torque-proofing and/or torque support.

(27) In the embodiment of the duplex clutch 10 shown in FIG. 6, compared to the embodiment of the duplex clutch 10 shown in FIG. 3, the torsional vibration damper 62 is waived and the first counter plate 22 is connected directly to the drive shaft 14 with the help of connecting means 64. In this exemplary embodiment the first clutch disk 30 is connected via a first disk damper 32 to the first transmission input shaft 16 in a torque-proof fashion and the second clutch disk 42 is connected via a second disk damper 44 to the second transmission input shaft 20 in a torque-proof fashion. Any cyclic irregularity occurring in the torque introduced via the drive shaft 14 is damped by the first disk damper 32 of the first clutch disk 30 and/or by the second disk damper 44 of the second clutch disk 42.

(28) In the embodiment of the duplex clutch 10 shown in FIG. 7, compared to the embodiment of the duplex clutch 10 shown in FIG. 6, the clutch cover 48 is waived. In this exemplary embodiment the actuating system 52 is fastened directly at the transmission housing 94.

(29) Compared to the embodiment shown in FIG. 7, in the exemplary embodiment shown in FIG. 8 the actuating system 52 is not connected to the transmission housing 94 but rests via a bearing 104 on the second transmission input shaft 20 in order to transfer radial forces and/or axial forces. Further, the second transmission input shaft 20 may be supported via a journal bearing 106 embodied as a needle bearing. Any unintentional rotation of the actuating system 52 can be prevented by torque-proofing and/or a torque support.

(30) In the embodiment of the duplex clutch 10 shown in FIG. 9, compared to the embodiment of the duplex clutch 10 shown in FIG. 4, the torsional vibration damper 62 is replaced by a flex plate 92, with it being possible to dampen torsional vibrations by the first disk damper 32 and/or the second disk damper 44. The flex plate 92 is connected via the gear rim 72 to the first counter plate 22. Radially at the inside a support stop 108, embodied by the drive shaft 14, projects in the axial direction radially to the flex plate 92. When actuating the duplex clutch 10 with the help of the actuating system 52 the first counter plate 22 can be pressed against the support stop 108 such that the actuating forces can be transferred via the drive shaft 14. By the flexibility of the flex plate 92 in the axial direction, in case of axial oscillations and/or wobbling of the drive shaft 14, the first counter plate 22 can lift off the support stop 108 and/or tilt on the support stop 108 in order to compensate and/or dampen the axial vibrations and/or wobbling. A pilot bearing 91 for the transmission input shaft 16 is provided inside the support stop in the embodiment shown. If the pilot bearing 91 is waived or the pilot bearing 91 is arranged between the first counter plate 22 and the first transmission input shaft 16 the support stop 108 can be moved radially inwardly to an even greater extent. The stop area of the support bearing can also be arranged directly in the center of the drive shaft 14 on the axis of rotation. The stop area can be embodied as a swivel or ball area in order to allow slight tipping.

(31) In the embodiment of the duplex clutch 10 shown in FIG. 10, compared to the embodiment of the duplex clutch 10 shown in FIG. 3, the torsional vibration damper 62 can be waived, allowing here also to dampen rotary vibrations by the first disk damper 32 and/or the second disk damper 44. A flywheel 110, for example embodied as a drive plate, is connected to the drive shaft 14, with the gear rim 82 also being connected thereto. The flywheel 110 is connected to the first counter plate 22 via flat springs 112, essentially extending tangentially. With the help of the flat springs 112 the duplex clutch 10 can be radially centered at the drive shaft 14. The flat springs 112 can provide axial flexibility like a flex plate in order to allow compensating and/or damping axial oscillations and/or wobbling of the drive shaft 14. In this exemplary embodiment the actuating system 52 is not only connected via a cap bearing 50 to the clutch cover 48 but also via a flex plate 92 to a transmission housing 94.

(32) In the exemplary embodiment shown in FIG. 11 a flywheel 110, for example embodied as a drive plate, is connected with the drive shaft 14, with the gear rim 72 also being connected thereto. The flywheel 110 is connected via flat springs 112, essentially extending tangentially, to the first counter plate 22. Alternatively the drive plate and the flat springs 112 can be replaced by a flex plate. With the help of the flat springs 112 the duplex clutch 10 can be radially centered at the drive shaft 14. The flat springs 112 may provide axial flexibility like a flex plate in order to allow compensating and/or damping axial oscillations and/or wobbling of the drive shaft 14. Simultaneously the second counter plate 34 is coupled via an axial slide bearing 114 to the support bearing 78 in order to form radially acting compensation of slide offset 116. The axial slide bearing 114 is stressed by forces of the pre-stressed flat springs 112. In this exemplary embodiment the actuating system 52 is connected via a cap bearing 50 to the clutch cover 48.

(33) In the embodiment of the duplex clutch 10 shown in FIG. 12, compared to the embodiment of the duplex clutch 10 shown in FIG. 11, the clutch cover 48 is waived. In this exemplary embodiment the actuating system 52 rests via a bearing 104 on the second transmission input shaft 20 for transferring radial forces and/or axial forces. Further, the second transmission input shaft 20 can rest via a journal bearing 106 embodied as a needle bearing at the first transmission input shaft 16. Any unintentional rotation of the actuating system 52 can be prevented by torque-proofing and/or a torque support. As indicated in FIG. 12, the second counter plate 34 is coupled via the axial slide bearing 114 to the support bearing 78 in order to embody a radially acting compensation of slide offset 116. When actuating the duplex clutch 10 with the help of the actuating system 52 the second counter plate 34 can be pressed against the axial slide bearing 114 so that the actuating forces can be transferred via the support bearing 78 to the second transmission input shaft 20.

(34) In the embodiment of the duplex clutch 10 shown in FIG. 13, compared to the embodiment of the duplex clutch 10 shown in FIG. 11, the second counter plate 34 is coupled via two axial slide bearings 114 to the support bearing 78 in order to form a radially operating compensation of slide offset 116. As shown in FIG. 13, one axial slide bearing 114 each is arranged at both sides of the second counter plate 34. In this exemplary embodiment the radially acting compensation of slide offset 116 is pre-stressed by a spring 118. It is possible that the compensation of slide offset 116 can be transferred by the duplex axial bearing arrangement in both directions. In this case a targeted pre-stressing of the flat spring 112 or the alternatively used flex plate 92 can be waived, even when the actuating system 52 rests on the clutch cover 48. However, here it is required that, in addition to the compensation of slide offset 116, also the connection between the compensation of the slide offset 116 and the support bearing 78, the connection between the support bearing 78 and the transmission input shaft 16, 20, and the support bearing 78 itself can transfer axial forces in both directions. For this purpose, particularly deep groove ball bearings 78a are well suited.

(35) In the embodiment of the duplex clutch 10 shown in FIG. 14, compared to the embodiment of the duplex clutch 10 shown in FIG. 9, two first intermediate plates 26 and two second intermediate plates 38 are provided such that accordingly more first friction linings 28 and second friction linings 40 can be compressed. The effective friction area and the number of friction linings can be further increased thereby.

LIST OF REFERENCE CHARACTER

(36) 10 Duplex clutch 12 First partial clutch 14 Drive shaft 16 First transmission input shaft 18 Second partial clutch 20 Second transmission input shaft 22 First counter plate 24 First compression plate 26 First intermediate plate 28 First friction lining 30 First clutch disk 32 First disk damper 34 Second counter plate 36 Second compression plate 38 Second intermediate plate 40 Second friction lining 42 Second clutch disk 44 Second disk damper 46 Central plate 48 Clutch cover 50 Cap bearing 52 Actuating system 54 First actuating cup 56 Tensile element 58 Second actuating cup 60 Entraining ring 62 Torsional vibration damper 64 Connection means 66 Primary weight 68 Energy storage element 70 Secondary weight 72 Gear rim 74 Access opening 76 Fastening means 78 Support bearing 78a Deep groove ball bearing 80 First ring cylinder 82 Second ring cylinder 84 First actuating piston 86 First release bearing 88 Second actuating piston 90 Second release bearing 91 Pilot bearing 92 Flex plate 94 Transmission housing 96 Slide bearing 98 Spacer 100 Assembly opening 102 Roller bearing 104 Bearing 106 Journal bearing 108 Support stop 110 Flywheel 112 Flat spring 114 Axial slide bearing 116 Compensation for slide offset 118 Spring