WO2015130489A1 - Concentric dual clutch device - Google Patents

Concentric dual clutch device Download PDF

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Publication number
WO2015130489A1
WO2015130489A1 PCT/US2015/015811 US2015015811W WO2015130489A1 WO 2015130489 A1 WO2015130489 A1 WO 2015130489A1 US 2015015811 W US2015015811 W US 2015015811W WO 2015130489 A1 WO2015130489 A1 WO 2015130489A1
Authority
WO
WIPO (PCT)
Prior art keywords
section
radial
outer plate
plate carrier
force transmission
Prior art date
Application number
PCT/US2015/015811
Other languages
French (fr)
Inventor
Hans Juergen Hauck
Original Assignee
Borgwarner Inc.
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 Borgwarner Inc. filed Critical Borgwarner Inc.
Priority to CN201580009701.4A priority Critical patent/CN106030142B/en
Publication of WO2015130489A1 publication Critical patent/WO2015130489A1/en

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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
    • F16D25/06—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch
    • F16D25/062—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces
    • F16D25/063—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially
    • F16D25/0635—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs
    • F16D25/0638—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs with more than two discs, e.g. multiple lamellae
    • 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
    • F16D25/10—Clutch systems with a plurality of fluid-actuated clutches
    • 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
    • F16D21/00—Systems comprising a plurality of actuated clutches
    • F16D21/02—Systems comprising a plurality of actuated clutches for interconnecting three or more shafts or other transmission members in different ways
    • F16D21/06—Systems comprising a plurality of actuated clutches for interconnecting three or more shafts or other transmission members in different ways at least two driving shafts or two driven shafts being concentric
    • F16D2021/0661—Hydraulically actuated multiple lamellae clutches
    • 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
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/26—Cover or bell housings; Details or arrangements thereof

Definitions

  • the present invention relates to a concentric dual clutch device for arrangement in a drive train of a motor vehicle, between a drive unit and a transmission, which clutch device has an outer multiplate clutch, assigned to a first transmission input shaft, for selective torque transmission between the drive unit and the first transmission input shaft, and an inner multiplate clutch, assigned to a second transmission input shaft, for selective torque transmission between the drive unit and the second transmission input shaft, wherein the inner multiplate clutch is assigned an internal outer plate carrier and the outer multiplate clutch is assigned a force transmission element for transmitting an actuating force to the outer multiplate clutch.
  • EP 2 158 413 Bl discloses a concentric dual clutch device for arrangement in a drive train of a motor vehicle between a drive unit and a transmission.
  • the concentric dual clutch device has an outer multiplate clutch and an inner multiplate clutch. While the outer multiplate clutch is assigned an external outer plate carrier, the inner multiplate clutch is assigned an internal outer plate carrier, wherein the two outer plate carriers are each formed by a substantially tubular plate-carrying section and a radial supporting section adjoining the respective plate-carrying section, and the radial supporting sections are fastened in the radially inward direction on a clutch hub and are spaced apart in the axial direction.
  • the outer multiplate clutch or the plate pack thereof is furthermore assigned a force transmission element for transmitting an actuating force to the outer multiplate clutch, wherein the force transmission element extends substantially in the radial direction and, in the axial direction, is arranged between the two radial supporting sections of the two outer plate carriers.
  • the known concentric dual clutch device has proven its worth but is disadvantageous inasmuch as it has a relatively large axial overall length.
  • EP 1 612 444 Bl proposes another concentric dual clutch device for arrangement in a drive train of a motor vehicle, between a drive unit and a transmission, in which the axial overall length is reduced.
  • the internal outer plate carrier assigned to the inner multiplate clutch which is reduced substantially to the tubular plate-carrying section, is fastened at one end on the radial supporting section of the external outer plate carrier assigned to the outer multiplate clutch, thereby forming a common subsection of the radial supporting section, by means of which both the internal and the external outer plate carrier can be supported or are supported on a clutch hub in a radial direction.
  • the force transmission element assigned to the outer multiplate clutch is arranged on the side of the radial supporting section which faces away from the two multiplate clutches, wherein axially projecting actuating fingers which extend in an axial direction through windows in the radial supporting section of the external outer plate carrier in order to reach the outer multiplate clutch or the plate pack thereof are provided on the force transmission element.
  • the known concentric dual clutch device has proven its worth inasmuch as it is possible to achieve a particularly small axial overall length, but a relatively large force transmission path by way of the force transmission element has to be accepted here and, moreover, rather point-type force transmission via the actuating fingers of the force transmission element to the outer multiplate clutch or the plate pack thereof is possible.
  • the concentric dual clutch device is used for arrangement in a drive train of a motor vehicle, between a drive unit and a transmission.
  • the concentric dual clutch device has an outer multiplate clutch, assigned to a first transmission input shaft, for selective torque transmission between the drive unit and the first transmission input shaft, and an inner multiplate clutch, assigned to a second transmission input shaft, for selective torque transmission between the drive unit and the second transmission input shaft.
  • the outer and inner multiplate clutches are arranged in such a way as to be nested in the radial direction in order to achieve a small axial overall length simply by this means.
  • the inner multiplate clutch is assigned an internal outer plate carrier, while the outer multiplate clutch is assigned a force transmission element for transmitting an actuating force to the outer multiplate clutch.
  • the internal outer plate carrier extends through apertures or windows in the force transmission element in order to transmit the actuating force to the outer multiplate clutch.
  • the internal outer plate carrier extends through apertures or windows in the force transmission element, and it is also possible to say that, conversely, the force transmission element extends through apertures or windows in the internal outer plate carrier, it is possible to provide, on the one hand, a compact construction and a short axial overall length of the concentric dual clutch device and, on the other hand, a relatively small force transmission element with a short force transmission path, especially since the force transmission element is associated with the outer multiplate clutch over a relatively direct path.
  • the internal outer plate carrier extends in an axial direction through the apertures or windows in the force transmission element for transmitting the actuating force to the outer multiplate clutch.
  • the internal outer plate carrier in a preferred embodiment of the concentric dual clutch device according to the invention is fastened against relative rotation, on the side of the force transmission element which faces away from the inner multiplate clutch, on a radial supporting section of an external outer plate carrier assigned to the outer multiplate clutch.
  • it is preferably fastened by welding or riveting, although, in principle, other fastening methods are also possible. Fastening the internal outer plate carrier on the radial supporting section of the external plate carrier makes it possible to dispense with a radial supporting section on the internal outer plate carrier, especially since the latter is now supported by the radial supporting section of the external outer plate carrier.
  • the internal outer plate carrier which is reduced substantially to a tubular plate-carrying section, is fastened on the radial supporting section in such a way as to form a common subsection of the radial supporting section of the external outer plate carrier, with the result that both the internal and the external outer plate carrier can be supported or are supported in the radial direction by means of the subsection.
  • the external outer plate carrier, the internal outer plate carrier and the force transmission element form a coherent module on which the force transmission element is held captive by fastening the internal outer plate carrier on the radial supporting section.
  • Preferably holding is accomplished by positive engagement in this case. If the force transmission element is held on the radial supporting section solely by fastening the internal outer plate carrier, additional measures for securing it can be omitted, thereby significantly simplifying manufacture and assembly.
  • the internal outer plate carrier has fastening tongues which extend through the apertures or windows.
  • fastening tongues are preferably formed integrally with the internal outer plate carrier.
  • the fastening tongues in another advantageous embodiment of the concentric dual clutch device according to the invention end before a plate-carrying section of the internal outer plate carrier.
  • the fastening tongues are provided on an axial section offset in the radial direction relative to a plate-carrying section of the internal outer plate carrier, wherein the fastening tongues can completely or at least partially form the axial section offset in the radial direction.
  • an axial section offset in the radial direction relative to the plate-carrying section of the internal outer plate carrier has the advantage that the connecting section between the plate-carrying section and the axial section offset in the radial direction leads to reinforcement or stabilization of the internal outer plate carrier.
  • the axial section is offset inward in a radial direction relative to the plate-carrying section of the internal outer plate carrier, especially since additional installation space is thereby formed radially to the outside of the axial section offset inward in a radial direction, said additional installation space enabling the force transmission element to be brought up to the outer multiplate clutch more directly and thus in a manner which shortens the force transmission path, a theme which will be addressed again later.
  • the fastening tongues or the free spaces formed in the circumferential direction between the fastening tongues end before the connecting section connecting the plate-carrying section to the offset axial section to enable the connecting section to fully develop its function of stabilizing and reinforcing the internal outer plate carrier.
  • the force transmission element is inclined, curved or offset in the direction of the outer multiplate clutch in a radial region of a connecting section connecting the plate-carrying section to the offset axial section in order - as already mentioned above - to exploit the additional installation space in the radial region to the outside, in the radial direction, of the axial section offset in the radial direction, thereby shortening the force transmission path via the force transmission element. It is thereby possible not only to shorten the force transmission path via the force transmission element but also to achieve a compact and space-saving construction of the concentric dual clutch device.
  • the fastening tongues in another advantageous embodiment of the concentric dual clutch device according to the invention have a first tongue section and a second tongue section angled relative to the first tongue section, by means of which the fastening tongues are fastened on the radial supporting section.
  • the second tongue section is preferably the free end section of the respective fastening tongue.
  • the first tongue section preferably extends in an axial direction while, as an alternative or additional measure, the second tongue section extends parallel to the radial supporting section of the external outer plate carrier and/or in the radial direction, particularly preferably inward in a radial direction, starting from the first tongue section.
  • a second tongue section extending parallel to the radial supporting section and/or in the radial direction has the advantage that particularly reliable support and/or fastening of the internal outer plate carrier on the radial supporting section of the external outer plate carrier is possible by means of the second tongue sections. As already indicated above, fastening can be accomplished here by welding or riveting, for example.
  • Riveting or some other nonpositive and/or positive fastening is advantageous relative to welding inasmuch as heat effects on or soiling of the force transmission element in the course of manufacture is largely excluded.
  • welding or some other form of positive fastening has the advantage that fastening can be performed in a relatively small fastening zone, e.g. by means of spot welds, which requires only relatively small second tongue sections.
  • the force transmission element is in rotary driving connection with the external outer plate carrier.
  • the rotary driving connection is achieved by positive engagement.
  • the rotary driving connection between the force transmission element and the external outer plate carrier can be accomplished in any way, i.e. directly or indirectly.
  • the force transmission element is in rotary driving connection with the external outer plate carrier with permanent spacing of the internal outer plate carrier, particularly preferably the fastening tongues thereof, in both circumferential directions from the respective edge of the apertures or windows.
  • This is advantageous inasmuch as the rotary driving connection between the force transmission element and the external outer plate carrier is not made indirectly via the fastening tongues extending into the apertures or windows, in the region of which tongues the internal outer plate carrier is in any case weakened, if only slightly. Consequently, this embodiment ensures a particularly stable internal outer plate carrier, it furthermore being preferred in this embodiment if the rotary driving connection between the force transmission element and the external outer plate carrier is not made indirectly via the internal outer plate carrier, even at a different location.
  • the force transmission element is in rotary driving connection with the external outer plate carrier by means of a toothing engaging in the toothing of a plate-carrying section of the external outer plate carrier. Consequently, the toothing on the plate-carrying section, which toothing is in any case already present, is advantageously used to receive the outer plates for conjoint rotation in order also to achieve the rotary driving connection between the external outer plate carrier and the force transmission element, wherein the latter must merely have a corresponding toothing engaging in the toothing of the plate-carrying section, which corresponding toothing can be manufactured in a relatively simple and accurate manner.
  • the force transmission element is in rotary driving connection with the external outer plate carrier with permanent spacing of the internal outer plate carrier in both circumferential directions from the respective edge of the apertures or windows
  • the rotary driving connection of the force transmission element with the external outer plate carrier is made by means of the actuating tongues extending through the apertures or windows in an alternative variant embodiment of the concentric dual clutch device according to the invention.
  • the force transmission element has a first radial section, assigned to the outer multiplate clutch, and a second radial section, in which the apertures or windows are provided, wherein the first radial section is formed so as to run around continuously, and therefore in the form of a ring, in the circumferential direction. Since the first radial section is designed so as to run around continuously or in the form of a ring in the circumferential direction, the force transmission element has a greater stiffness, and therefore the hysteresis behavior is significantly improved.
  • the actuating force can be applied uniformly or annularly to the outer multiplate clutch or the plate pack thereof if the first radial section can be brought into operative connection with the outer multiplate clutch or the plate pack thereof, as is furthermore preferred in the embodiment under consideration.
  • the force transmission element is preferably designed as a formed sheet-metal part in order, on the one hand, to reduce the weight of the dual clutch device and, on the other hand, to allow simple manufacture thereof.
  • the first radial section of the force transmission element is preferably formed integrally with the second radial section in order to simplify the production of the force transmission element and also the mounting thereof within the dual clutch device and furthermore to provide a particularly stiff force transmission element while dispensing with additional connecting means.
  • the force transmission element furthermore has a third radial section in addition to the first and second radial sections, which third radial section is connected to the first radial section by means of the second radial section and preferably serves to accept the actuating force of an actuating device, e.g. a hydraulically drivable piston.
  • an actuating device e.g. a hydraulically drivable piston.
  • the third radial section too is preferably designed to run around continuously or in the form of a ring in the circumferential direction in order to allow the advantages already indicated above, such as increased stiffness and uniform acceptance of the actuating force, the latter particularly if the actuating force can be accepted annularly by the third radial section running around continuously in the circumferential direction, as is moreover preferred. It is furthermore preferred in this embodiment if the third radial section is formed integrally with the first and second radial sections, with the result that these may form an integrally formed sheet-metal part comprising a first, second and third radial section, which serves as a force transmission element.
  • the force transmission element assigned to the outer multiplate clutch and a force transmission element assigned to the inner multiplate clutch can each be actuated by at least one hydraulically drivable piston. It is preferred here if a hydraulically drivable annular piston is provided in each case. In this variant embodiment, it is furthermore preferred if the piston is formed integrally with the respective force transmission element, wherein the piston for driving the force transmission element assigned to the outer multiplate clutch can in this case be formed integrally with the third radial section, for example, or forms the third radial section completely or partially.
  • each of the pistons is assigned a pressure space, and at least one of the pistons is assigned a pressure compensating space for achieving at least partial centrifugal oil compensation. It is preferred here if each of the two pistons is assigned a pressure space and a pressure compensating space in order to achieve an at least partial centrifugal oil compensation in respect of both pistons.
  • the pressure compensating space of one piston is delimited with respect to the pressure space of the other piston by a partition wall. It is preferred here if the partition wall delimits the pressure compensating space and the pressure space, in each case directly.
  • the partition wall is arranged on a clutch hub of the dual clutch device, and, in this case, it is furthermore preferred if the partition wall is arranged and/or fastened on the clutch hub of the dual clutch device in a manner spaced apart from the abovementioned common subsection of the radial supporting section of the external outer plate carrier.
  • the partition wall does not have a loadbearing or supporting function in respect of one of the outer plate carriers or inner plate carriers of the multiplate clutches.
  • the partition wall does not form a loadbearing or supporting section of an outer plate carrier or inner plate carrier of the multiplate clutches.
  • Figure 1 shows a partial side view of one embodiment of the concentric dual clutch device according to the invention in section
  • Figure 2 shows the detail A in Figure 1 in a preferred variant embodiment of the concentric dual clutch device in Figure 1,
  • FIG 3 shows a perspective illustration of a module comprising the internal outer plate carrier, the external outer plate carrier and the force transmission element according to Figure 1 , and
  • Figure 4 shows the perspective illustration according to Figure 3 in a partial sectional view.
  • Figure 1 shows a concentric dual clutch device 2 for arrangement in a drive train of a motor vehicle, between a drive unit 4, preferably an internal combustion engine, and a transmission 6, wherein the drive unit 4 and the transmission 6 are indicated only schematically.
  • Other parts of the transmission 6 which are shown are a first transmission input shaft 8 and a second transmission input shaft 10, wherein the second transmission input shaft 10 is designed as a hollow shaft, through which the first transmission input shaft 8 extends, and it is therefore also possible to refer to concentrically arranged transmission input shafts 8, 10.
  • the mutually opposite axial directions 12, 14, the mutually opposite radial directions 16, 18 and the mutually opposite circumferential directions 20, 22 of the dual clutch device 2 are indicated by means of corresponding arrows, wherein the circumferential directions 20, 22 can also be referred to as directions of rotation, and the dual clutch device 2 has an axis of rotation 24 which extends in mutually opposite axial directions 12, 14.
  • the dual clutch device 2 has a clutch input hub 26, which is or can be brought into rotary driving connection with the drive unit 4 and is connected for conjoint rotation by means of a rotary driving disk 28 which is arranged on the clutch input hub 26 for conjoint rotation and extends outward in a radial direction 16.
  • the rotary driving disk 28 is in releasable rotary driving connection with the external outer plate carrier (described in greater detail below) of the dual clutch device 2, wherein this is accomplished in the illustrated embodiment by means of a toothing on the rotary driving disk 28, which toothing is situated on the outside in radial direction 16 and engages in a toothing on the external outer plate carrier, wherein the rotary driving disk 28 is fixed on the external outer plate carrier in axial direction 12 by means of a retaining ring 30.
  • the dual clutch device 2 has an outer multiplate clutch 32 and an inner multiplate clutch 34, wherein the multiplate clutches 32, 34 are formed substantially by plate packs comprising outer plates and inner plates, wherein the plate packs of the outer and inner multiplate clutches 32, 34 overlap in an axial region, it also being possible to say that the outer multiplate clutch 32 and the inner multiplate clutch 34 are arranged in a nested manner in the radial direction 16, 18.
  • the outer multiplate clutch 32 is assigned an external outer plate carrier 36, which has a substantially tubular plate-carrying section 38 having an internal toothing for arrangement of the outer plates of the outer multiplate clutch 32 for conjoint rotation, and a radial supporting section 40, which adjoins plate-carrying section 38 in axial direction 14 and, starting from plate-carrying section 38, extends inward in radial direction 18 so as to be connected to a clutch hub 42 for conjoint rotation.
  • the outer multiplate clutch 32 is assigned an inner plate carrier 44, which has a substantially tubular plate-carrying section 46 and a radial supporting section 48, which adjoins plate-carrying section 46 in axial direction 12 and extends inward in radial direction 18 so as to be in rotary driving connection with the first transmission input shaft 8 via a first clutch output hub 50. Consequently, the outer multiplate clutch 32 is designed in such a way that it serves for selective torque transmission between the drive unit 4 and the first transmission input shaft 8.
  • the inner multiplate clutch 34 serves for selective torque transmission between the drive unit 4 and the second transmission input shaft 10.
  • the inner multiplate clutch 34 is assigned an internal outer plate carrier 52 and an inner plate carrier 54, wherein the latter has a substantially tubular plate-carrying section 56 and a radial supporting section 58 adjoining plate-carrying section 56 in axial direction 12.
  • radial supporting section 58 extends inward in radial direction 18 as far as a second clutch output hub 60, by means of which the inner plate carrier 54 of the inner multiplate clutch 34 is in rotary driving connection with the second transmission input shaft 10.
  • the internal outer plate carrier 52 has a substantially tubular plate-carrying section 62, which has an internal toothing for receiving the outer plates of the inner multiplate clutch 34 for conjoint rotation.
  • a connecting section 64 adjoins plate-carrying section 62, extending inward in radial direction 18, starting from plate-carrying section 62.
  • the internal outer plate carrier 52 has fastening tongues 68, which are spaced apart from one another in the circumferential direction 20, 22 and are provided at least in part on the axial section 66 or at least partially form the axial section 66.
  • the fastening tongues 68 each have a first tongue section 70, which is situated substantially in the axial section 66 and consequently likewise extends in axial direction 14, and a second tongue section 72, which is angled relative to the first tongue section 70.
  • the second tongue section 72 extends substantially parallel to the radial supporting section 40 of the external outer plate carrier 36 and, starting from the first tongue section 70, extends inward in radial direction 18 as far as a free end 74.
  • the opposite end of the fastening tongues 68 from the free end 74 ends not only before the plate-carrying section 62 of the internal outer plate carrier 52 but also before the connecting section 64 connecting the plate-carrying section 62 of the internal outer plate carrier 52 to the axial section 66, and it is therefore also possible to refer in connection with the connecting section 64 to a connecting section 64 which runs around continuously in the circumferential direction 20, 22 or is ring-shaped.
  • the internal outer plate carrier 52 is fastened for conjoint rotation on the radial supporting section 40 of the external outer plate carrier 36, wherein the fastening for conjoint rotation can be accomplished in any way, although it is preferred if the internal outer plate carrier 52 is welded or - as illustrated in Figures 3 and 4 - riveted to the radial supporting section 40 of the external outer plate carrier 36.
  • the fastening of the internal outer plate carrier 52 on the radial supporting section 40 of the external outer plate carrier 36 for conjoint rotation is accomplished by means of the fasting tongues 68, to be more precise the second tongue sections 72 of the fastening tongues 68, more specifically with the formation of a common subsection 76 of the radial supporting section 40 of the external outer plate carrier 36, by means of which both the internal and the external outer plate carrier 52, 36 can be supported or are supported in the radial direction 16, 18 on the clutch hub 42.
  • Both the outer multiplate clutch 32 and the inner multiplate clutch 34 are assigned a force transmission element 78, 80, respectively, for transmitting an actuating force to the outer and inner multiplate clutches 32, 34.
  • the two force transmission elements 78, 80 are each designed as formed sheet-metal parts, wherein the two force transmission elements 78, 80 can each be driven by means of a hydraulically drivable piston 82, 84.
  • the pistons 82, 84 are each formed integrally with the associated force transmission element 78, 80 formed by a formed sheet-metal part.
  • Each of the two pistons 82, 84 is assigned a pressure space 86, 88, which can be pressurized with a hydraulic medium, and a pressure compensating space 90, 92, wherein the latter serve to achieve at least partial centrifugal oil compensation.
  • Pressure space 86 is delimited in axial direction 12 by piston 82 and in axial direction 14 by the radial supporting section 40 of the external outer plate carrier 36, more precisely by the common subsection 76 of radial supporting section 40.
  • Pressure compensating space 90 is delimited in axial direction 12 by a partition wall 94 and in axial direction 14 by piston 82.
  • Pressure space 88 is delimited in axial direction 12 by piston 84 and in axial direction 14 by the partition wall 94. Consequently, the pressure compensating space 90 of piston 82 is delimited with respect to the pressure space 88 of piston 84 by the partition wall 94, wherein the partition wall 94 in each case directly delimits pressure compensating space 90 and pressure space 88.
  • the partition wall 94 is arranged or fastened on the clutch hub 42.
  • the partition wall 94 does not have any loadbearing or supporting function in the radial direction 16, 18 with respect to the external outer plate carrier 36 and the internal outer plate carrier 52, and this applies in a corresponding way to the inner plate carriers 44 and 54.
  • the outer plate carriers 36, 52 are supported in the radial direction 16, 18 on the clutch hub 42 by means of the common subsection 76, already mentioned above, of the radial supporting section 40 of the external outer plate carrier 36.
  • the partition wall 94 is of thinner- walled design than the radial supporting section 40 of the external outer plate carrier 36 or at least of thinner- walled design than the common subsection 76 of radial supporting section 40.
  • pressure compensating space 90 and pressure space 86 which are assigned to piston 82, are arranged in such a way as to be at least partially nested in the radial direction 16, 18. In the embodiment shown here, this applies in a corresponding way to piston 84, the pressure compensating space 92 and pressure space 88 of which are arranged in an at least partially nested manner in the radial direction 16, 18.
  • the radial nesting, which ultimately leads to an axial region of overlap, is achieved by corresponding shaping of the respective pistons 82 and 84.
  • the force transmission element 78 assigned to the outer multiplate clutch 32 has a first radial section 96 on the outside in radial direction 16, a second radial section 98, which follows the first radial section 96 inward in radial direction 18, and a third radial section 100, which follows the second radial section 98 inward in radial direction 18 and is formed completely or at least partially by piston 82.
  • the first radial section 96 is designed to run around continuously or in the form of a ring in the circumferential direction 20, 22.
  • apertures or windows spaced apart from one another in the circumferential direction 20, 22 are provided in the second radial section 98, wherein, in the example under consideration, the term windows 102 should be used since the apertures are completely surrounded by an edge and therefore these are not merely lateral notches in force transmission element 78.
  • the first and second radial sections 96, 98 are formed integrally with one another.
  • the third radial section 100 which is connected to the first radial section 96 by means of the second radial section 98, is in turn designed to run around continuously or in the form of a ring in the circumferential direction 20, 22, wherein the third radial section 100 is formed integrally with the first and second radial sections 96, 98 and - in the embodiment illustrated - integrally with piston 82, and it is therefore also possible to speak of an integral force transmission element 78.
  • the internal outer plate carrier 52 extends through the apertures or windows 102 in the second radial section 98 of force transmission element 78 in axial direction 14.
  • the fastening tongues 68 extend in the axial direction 12, 14 through the apertures or windows 102 so as to be fastened for conjoint rotation in the manner already described above on the radial supporting section 40 of the external outer plate carrier 36 on the side of force transmission element 78 which faces away from the inner multiplate clutch 34 by means of the second tongue section 72, wherein the internal outer plate carrier 52 is preferably also fixed or held in the axial directions 12, 14 on the radial supporting section by the fastening.
  • the external outer plate carrier 36, the internal outer plate carrier 52 and force transmission element 78 form a coherent module, on which force transmission element 78 is held captive by positive engagement simply by fastening the internal outer plate carrier 52 on the radial supporting section 40 of the external outer plate carrier 36 by means of the fastening tongues 68.
  • the force transmission element 78 in this module can no longer accidentally become detached from the module in one of the axial directions 12, 14, especially since fastening brings about not only fastening for conjoint rotation but also fastening of the internal outer plate carrier 52 on the radial supporting section 40 of the external outer plate carrier 36 with fixing in the axial direction 12, 14.
  • the force transmission element 78 is inclined, curved or offset in the direction of the outer multiplate clutch 32, i.e. here in axial direction 12, in particular relative to the second radial section 98, in a radial region 104 of the connecting section 64 connecting plate-carrying section 62 to the offset axial section 66, in order to make good use of the free space obtained by means of the axial section 66 offset inward in radial direction 18, to provide a relatively stiff force transmission element 78 with a reduced hysteresis behavior, and to achieve a compact and space-saving construction of the dual clutch device 2.
  • Force transmission element 78 is in rotary driving connection with the external outer plate carrier 36, wherein the rotary driving connection is preferably achieved by means of positive engagement.
  • the rotary driving connection can be brought about indirectly via the fastening tongues 68 extending through the apertures or windows 102, said fastening tongues, for their part, being fastened for conjoint rotation on the external outer plate carrier 36 or the radial supporting section 40 thereof. This would have the advantage that it is possible to dispense with additional means between the external outer plate carrier 36 and the force transmission element 78 for achieving the rotary driving connection, and this would result in a simplified construction and simplified manufacture.
  • the fastening tongues 68 extending into the apertures or windows 102 could be supported by means of their edge facing in at least one of the circumferential directions 20, 22 on the edge of the apertures or windows 102 which face in a circumferential direction 20 or 22 in order to transmit torque.
  • means for achieving the rotary driving connection between the external outer plate carrier 36 and force transmission element 78 can be provided at some other location, while force transmission element 78 is in rotary driving connection with the external outer plate carrier 36 with permanent spacing of the internal outer plate carrier 52 or of the fastening tongues 68 thereof from the respective edge of the apertures or windows 102 in both circumferential directions 20, 22.
  • This can be accomplished, for example, by appropriately larger dimensioning of the apertures or windows 102 in the circumferential direction 20, 22 in relation to the dimensions of the fastening tongues 68 in the circumferential directions 20, 22 in order to effect permanent spacing of the fastening tongues 68 from the edge of the apertures or windows 102.
  • the means for achieving the positive rotary driving connection between force transmission element 78 and the external outer plate carrier 36 could also consist in that force transmission element 78 has a toothing 106 engaging in the toothing of the plate-carrying section 38 of the external outer plate carrier 36, as shown by way of example in Figure 2.
  • the variant embodiment in which the rotary driving connection between the external outer plate carrier 36 and force transmission element 78 is not accomplished indirectly via the fastening tongues 68 and the apertures or windows 102 has the advantage that any dimensional deviations in the fastening of the fastening tongues 68 on the radial supporting section 40 of the external outer plate carrier 36 do not have any effect on the play of force transmission element 78 in the circumferential direction 20, 22 in relation to the external outer plate carrier 36; on the contrary, the play is determined exclusively by the means for achieving the rotary driving connection, that is to say, for example, the toothing 106. It has also been found that manufacture, in particular the fastening of the internal outer plate carrier 52 on the radial supporting section 40 of the external outer plate carrier 36, is simplified in this way. LIST OF REFERENCE SIGNS

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

Abstract

The present invention relates to a concentric dual clutch device (2) for arrangement in a drive train of a motor vehicle, between a drive unit (4) and a transmission (6), which clutch device has an outer multiplate clutch (32), assigned to a first transmission input shaft (8), for selective torque transmission between the drive unit (4) and the first transmission input shaft (8), and an inner multiplate clutch (34), assigned to a second transmission input shaft (10), for selective torque transmission between the drive unit (4) and the second transmission input shaft (10), wherein the inner multiplate clutch (34) is assigned an internal outer plate carrier (52) and the outer multiplate clutch (32) is assigned a force transmission element (78) for transmitting an actuating force to the outer multiplate clutch (32), and the internal outer plate carrier (52) extends through apertures or windows (102) in the force transmission element (78).

Description

CONCENTRIC DUAL CLUTCH DEVICE DESCRIPTION The present invention relates to a concentric dual clutch device for arrangement in a drive train of a motor vehicle, between a drive unit and a transmission, which clutch device has an outer multiplate clutch, assigned to a first transmission input shaft, for selective torque transmission between the drive unit and the first transmission input shaft, and an inner multiplate clutch, assigned to a second transmission input shaft, for selective torque transmission between the drive unit and the second transmission input shaft, wherein the inner multiplate clutch is assigned an internal outer plate carrier and the outer multiplate clutch is assigned a force transmission element for transmitting an actuating force to the outer multiplate clutch.
EP 2 158 413 Bl discloses a concentric dual clutch device for arrangement in a drive train of a motor vehicle between a drive unit and a transmission. The concentric dual clutch device has an outer multiplate clutch and an inner multiplate clutch. While the outer multiplate clutch is assigned an external outer plate carrier, the inner multiplate clutch is assigned an internal outer plate carrier, wherein the two outer plate carriers are each formed by a substantially tubular plate-carrying section and a radial supporting section adjoining the respective plate-carrying section, and the radial supporting sections are fastened in the radially inward direction on a clutch hub and are spaced apart in the axial direction. The outer multiplate clutch or the plate pack thereof is furthermore assigned a force transmission element for transmitting an actuating force to the outer multiplate clutch, wherein the force transmission element extends substantially in the radial direction and, in the axial direction, is arranged between the two radial supporting sections of the two outer plate carriers. The known concentric dual clutch device has proven its worth but is disadvantageous inasmuch as it has a relatively large axial overall length.
EP 1 612 444 Bl proposes another concentric dual clutch device for arrangement in a drive train of a motor vehicle, between a drive unit and a transmission, in which the axial overall length is reduced. For this purpose, the internal outer plate carrier assigned to the inner multiplate clutch, which is reduced substantially to the tubular plate-carrying section, is fastened at one end on the radial supporting section of the external outer plate carrier assigned to the outer multiplate clutch, thereby forming a common subsection of the radial supporting section, by means of which both the internal and the external outer plate carrier can be supported or are supported on a clutch hub in a radial direction. In contrast, the force transmission element assigned to the outer multiplate clutch is arranged on the side of the radial supporting section which faces away from the two multiplate clutches, wherein axially projecting actuating fingers which extend in an axial direction through windows in the radial supporting section of the external outer plate carrier in order to reach the outer multiplate clutch or the plate pack thereof are provided on the force transmission element. The known concentric dual clutch device has proven its worth inasmuch as it is possible to achieve a particularly small axial overall length, but a relatively large force transmission path by way of the force transmission element has to be accepted here and, moreover, rather point-type force transmission via the actuating fingers of the force transmission element to the outer multiplate clutch or the plate pack thereof is possible.
It is therefore an object of the present invention to provide a concentric dual clutch device which, on the one hand, has a compact construction, in particular a short axial overall length, and permits a relatively short force transmission path for the transmission of the actuating force by way of the force transmission element assigned to the outer multiplate clutch.
This object is achieved by means of the features indicated in patent claim 1. Advantageous embodiments of the invention are the subject matter of the dependent claims.
The concentric dual clutch device according to the invention is used for arrangement in a drive train of a motor vehicle, between a drive unit and a transmission. Thus, the concentric dual clutch device has an outer multiplate clutch, assigned to a first transmission input shaft, for selective torque transmission between the drive unit and the first transmission input shaft, and an inner multiplate clutch, assigned to a second transmission input shaft, for selective torque transmission between the drive unit and the second transmission input shaft. It is apparent from the designation "concentric dual clutch device" that the outer and inner multiplate clutches are arranged in such a way as to be nested in the radial direction in order to achieve a small axial overall length simply by this means. The inner multiplate clutch is assigned an internal outer plate carrier, while the outer multiplate clutch is assigned a force transmission element for transmitting an actuating force to the outer multiplate clutch. In this case, the internal outer plate carrier extends through apertures or windows in the force transmission element in order to transmit the actuating force to the outer multiplate clutch. By virtue of the fact that the internal outer plate carrier extends through apertures or windows in the force transmission element, and it is also possible to say that, conversely, the force transmission element extends through apertures or windows in the internal outer plate carrier, it is possible to provide, on the one hand, a compact construction and a short axial overall length of the concentric dual clutch device and, on the other hand, a relatively small force transmission element with a short force transmission path, especially since the force transmission element is associated with the outer multiplate clutch over a relatively direct path.
In an advantageous embodiment of the concentric dual clutch device according to the invention, the internal outer plate carrier extends in an axial direction through the apertures or windows in the force transmission element for transmitting the actuating force to the outer multiplate clutch.
In order to further shorten the axial overall length, the internal outer plate carrier in a preferred embodiment of the concentric dual clutch device according to the invention is fastened against relative rotation, on the side of the force transmission element which faces away from the inner multiplate clutch, on a radial supporting section of an external outer plate carrier assigned to the outer multiplate clutch. In this case, it is preferably fastened by welding or riveting, although, in principle, other fastening methods are also possible. Fastening the internal outer plate carrier on the radial supporting section of the external plate carrier makes it possible to dispense with a radial supporting section on the internal outer plate carrier, especially since the latter is now supported by the radial supporting section of the external outer plate carrier. This not only reduces the axial overall length but also reduces the weight of the concentric dual clutch device. Thus, it is particularly preferred if the internal outer plate carrier, which is reduced substantially to a tubular plate-carrying section, is fastened on the radial supporting section in such a way as to form a common subsection of the radial supporting section of the external outer plate carrier, with the result that both the internal and the external outer plate carrier can be supported or are supported in the radial direction by means of the subsection.
In a particularly preferred embodiment of the concentric dual clutch device according to the invention, the external outer plate carrier, the internal outer plate carrier and the force transmission element form a coherent module on which the force transmission element is held captive by fastening the internal outer plate carrier on the radial supporting section. Preferably holding is accomplished by positive engagement in this case. If the force transmission element is held on the radial supporting section solely by fastening the internal outer plate carrier, additional measures for securing it can be omitted, thereby significantly simplifying manufacture and assembly.
In another preferred embodiment of the concentric dual clutch device according to the invention, the internal outer plate carrier has fastening tongues which extend through the apertures or windows. In this way, it is possible, for example, for a plurality of fastening tongues spaced apart from one another in the circumferential direction and extending through the apertures or windows to be provided. The fastening tongues are preferably formed integrally with the internal outer plate carrier.
To ensure that the fastening tongues or the free spaces formed in the circumferential direction between the fastening tongues do not lead to weakening of the plate-carrying section of the internal outer plate carrier, the fastening tongues in another advantageous embodiment of the concentric dual clutch device according to the invention end before a plate-carrying section of the internal outer plate carrier.
According to another preferred embodiment of the concentric dual clutch device according to the invention, the fastening tongues are provided on an axial section offset in the radial direction relative to a plate-carrying section of the internal outer plate carrier, wherein the fastening tongues can completely or at least partially form the axial section offset in the radial direction. Irrespective of their respective variant embodiment, an axial section offset in the radial direction relative to the plate-carrying section of the internal outer plate carrier has the advantage that the connecting section between the plate-carrying section and the axial section offset in the radial direction leads to reinforcement or stabilization of the internal outer plate carrier. In this embodiment, it is particularly preferred if the axial section is offset inward in a radial direction relative to the plate-carrying section of the internal outer plate carrier, especially since additional installation space is thereby formed radially to the outside of the axial section offset inward in a radial direction, said additional installation space enabling the force transmission element to be brought up to the outer multiplate clutch more directly and thus in a manner which shortens the force transmission path, a theme which will be addressed again later.
In another preferred embodiment of the concentric dual clutch device according to the invention, the fastening tongues or the free spaces formed in the circumferential direction between the fastening tongues end before the connecting section connecting the plate-carrying section to the offset axial section to enable the connecting section to fully develop its function of stabilizing and reinforcing the internal outer plate carrier.
In a particularly advantageous embodiment of the concentric dual clutch device according to the invention, the force transmission element is inclined, curved or offset in the direction of the outer multiplate clutch in a radial region of a connecting section connecting the plate-carrying section to the offset axial section in order - as already mentioned above - to exploit the additional installation space in the radial region to the outside, in the radial direction, of the axial section offset in the radial direction, thereby shortening the force transmission path via the force transmission element. It is thereby possible not only to shorten the force transmission path via the force transmission element but also to achieve a compact and space-saving construction of the concentric dual clutch device.
In order to ensure that the internal outer plate carrier is fastened reliably on the radial supporting section of the external outer plate carrier while simultaneously ensuring simplicity of manufacture, the fastening tongues in another advantageous embodiment of the concentric dual clutch device according to the invention have a first tongue section and a second tongue section angled relative to the first tongue section, by means of which the fastening tongues are fastened on the radial supporting section. The second tongue section is preferably the free end section of the respective fastening tongue. In this embodiment, the first tongue section preferably extends in an axial direction while, as an alternative or additional measure, the second tongue section extends parallel to the radial supporting section of the external outer plate carrier and/or in the radial direction, particularly preferably inward in a radial direction, starting from the first tongue section. A second tongue section extending parallel to the radial supporting section and/or in the radial direction has the advantage that particularly reliable support and/or fastening of the internal outer plate carrier on the radial supporting section of the external outer plate carrier is possible by means of the second tongue sections. As already indicated above, fastening can be accomplished here by welding or riveting, for example. Riveting or some other nonpositive and/or positive fastening is advantageous relative to welding inasmuch as heat effects on or soiling of the force transmission element in the course of manufacture is largely excluded. On the other hand, welding or some other form of positive fastening has the advantage that fastening can be performed in a relatively small fastening zone, e.g. by means of spot welds, which requires only relatively small second tongue sections.
In another advantageous embodiment of the concentric dual clutch device according to the invention, the force transmission element is in rotary driving connection with the external outer plate carrier. In this case, it is preferred if the rotary driving connection is achieved by positive engagement. In principle, the rotary driving connection between the force transmission element and the external outer plate carrier can be accomplished in any way, i.e. directly or indirectly.
In another particularly advantageous embodiment of the concentric dual clutch device according to the invention, the force transmission element is in rotary driving connection with the external outer plate carrier with permanent spacing of the internal outer plate carrier, particularly preferably the fastening tongues thereof, in both circumferential directions from the respective edge of the apertures or windows. This is advantageous inasmuch as the rotary driving connection between the force transmission element and the external outer plate carrier is not made indirectly via the fastening tongues extending into the apertures or windows, in the region of which tongues the internal outer plate carrier is in any case weakened, if only slightly. Consequently, this embodiment ensures a particularly stable internal outer plate carrier, it furthermore being preferred in this embodiment if the rotary driving connection between the force transmission element and the external outer plate carrier is not made indirectly via the internal outer plate carrier, even at a different location.
In another advantageous embodiment of the concentric dual clutch device according to the invention, the force transmission element is in rotary driving connection with the external outer plate carrier by means of a toothing engaging in the toothing of a plate-carrying section of the external outer plate carrier. Consequently, the toothing on the plate-carrying section, which toothing is in any case already present, is advantageously used to receive the outer plates for conjoint rotation in order also to achieve the rotary driving connection between the external outer plate carrier and the force transmission element, wherein the latter must merely have a corresponding toothing engaging in the toothing of the plate-carrying section, which corresponding toothing can be manufactured in a relatively simple and accurate manner.
Although it is regarded as advantageous above if the force transmission element is in rotary driving connection with the external outer plate carrier with permanent spacing of the internal outer plate carrier in both circumferential directions from the respective edge of the apertures or windows, the rotary driving connection of the force transmission element with the external outer plate carrier is made by means of the actuating tongues extending through the apertures or windows in an alternative variant embodiment of the concentric dual clutch device according to the invention. Although this leads to greater stress on the sections of the internal outer plate carrier or fastening tongues thereof which extend through the windows or apertures, especially since the torque transmission takes place via the sections or fastening tongues adjoining the edges of the windows or apertures, it should nevertheless be noted that the outlay on manufacture is thereby reduced, especially since there is no need to take any further measures to bring about the rotary driving connection between the force transmission element and the external outer plate carrier.
In a particularly advantageous embodiment of the concentric dual clutch device according to the invention, the force transmission element has a first radial section, assigned to the outer multiplate clutch, and a second radial section, in which the apertures or windows are provided, wherein the first radial section is formed so as to run around continuously, and therefore in the form of a ring, in the circumferential direction. Since the first radial section is designed so as to run around continuously or in the form of a ring in the circumferential direction, the force transmission element has a greater stiffness, and therefore the hysteresis behavior is significantly improved. Moreover, the actuating force can be applied uniformly or annularly to the outer multiplate clutch or the plate pack thereof if the first radial section can be brought into operative connection with the outer multiplate clutch or the plate pack thereof, as is furthermore preferred in the embodiment under consideration. In this embodiment, the force transmission element is preferably designed as a formed sheet-metal part in order, on the one hand, to reduce the weight of the dual clutch device and, on the other hand, to allow simple manufacture thereof.
In another advantageous embodiment of the concentric dual clutch device according to the invention, the first radial section of the force transmission element is preferably formed integrally with the second radial section in order to simplify the production of the force transmission element and also the mounting thereof within the dual clutch device and furthermore to provide a particularly stiff force transmission element while dispensing with additional connecting means.
In another preferred embodiment of the concentric dual clutch device according to the invention, the force transmission element furthermore has a third radial section in addition to the first and second radial sections, which third radial section is connected to the first radial section by means of the second radial section and preferably serves to accept the actuating force of an actuating device, e.g. a hydraulically drivable piston. The third radial section too is preferably designed to run around continuously or in the form of a ring in the circumferential direction in order to allow the advantages already indicated above, such as increased stiffness and uniform acceptance of the actuating force, the latter particularly if the actuating force can be accepted annularly by the third radial section running around continuously in the circumferential direction, as is moreover preferred. It is furthermore preferred in this embodiment if the third radial section is formed integrally with the first and second radial sections, with the result that these may form an integrally formed sheet-metal part comprising a first, second and third radial section, which serves as a force transmission element.
In another preferred embodiment of the concentric dual clutch device according to the invention, the force transmission element assigned to the outer multiplate clutch and a force transmission element assigned to the inner multiplate clutch can each be actuated by at least one hydraulically drivable piston. It is preferred here if a hydraulically drivable annular piston is provided in each case. In this variant embodiment, it is furthermore preferred if the piston is formed integrally with the respective force transmission element, wherein the piston for driving the force transmission element assigned to the outer multiplate clutch can in this case be formed integrally with the third radial section, for example, or forms the third radial section completely or partially.
In another preferred embodiment of the concentric dual clutch device according to the invention, each of the pistons is assigned a pressure space, and at least one of the pistons is assigned a pressure compensating space for achieving at least partial centrifugal oil compensation. It is preferred here if each of the two pistons is assigned a pressure space and a pressure compensating space in order to achieve an at least partial centrifugal oil compensation in respect of both pistons.
According to another advantageous embodiment of the concentric dual clutch device according to the invention, the pressure compensating space of one piston is delimited with respect to the pressure space of the other piston by a partition wall. It is preferred here if the partition wall delimits the pressure compensating space and the pressure space, in each case directly. As an alternative or in addition, the partition wall is arranged on a clutch hub of the dual clutch device, and, in this case, it is furthermore preferred if the partition wall is arranged and/or fastened on the clutch hub of the dual clutch device in a manner spaced apart from the abovementioned common subsection of the radial supporting section of the external outer plate carrier.
In another particularly preferred embodiment of the concentric dual clutch device according to the invention, the partition wall does not have a loadbearing or supporting function in respect of one of the outer plate carriers or inner plate carriers of the multiplate clutches. Thus, in particular, the partition wall does not form a loadbearing or supporting section of an outer plate carrier or inner plate carrier of the multiplate clutches. This has the advantage that a relatively simple and space-saving partition wall can be provided. Thus, it is preferred in this embodiment if the partition wall is of thinner-walled design than the radial supporting section of the external plate carrier and/or the common subsection of the radial supporting section of the external plate carrier in order to enable the partition wall to be installed in a space- and weight-saving and yet functionally suitable manner within the concentric dual clutch device.
The invention is explained in greater detail below by means of an illustrative embodiment with reference to the attached drawings, in which:
Figure 1 shows a partial side view of one embodiment of the concentric dual clutch device according to the invention in section,
Figure 2shows the detail A in Figure 1 in a preferred variant embodiment of the concentric dual clutch device in Figure 1,
Figure 3 shows a perspective illustration of a module comprising the internal outer plate carrier, the external outer plate carrier and the force transmission element according to Figure 1 , and
Figure 4shows the perspective illustration according to Figure 3 in a partial sectional view.
Figure 1 shows a concentric dual clutch device 2 for arrangement in a drive train of a motor vehicle, between a drive unit 4, preferably an internal combustion engine, and a transmission 6, wherein the drive unit 4 and the transmission 6 are indicated only schematically. Other parts of the transmission 6 which are shown are a first transmission input shaft 8 and a second transmission input shaft 10, wherein the second transmission input shaft 10 is designed as a hollow shaft, through which the first transmission input shaft 8 extends, and it is therefore also possible to refer to concentrically arranged transmission input shafts 8, 10. In the figures, the mutually opposite axial directions 12, 14, the mutually opposite radial directions 16, 18 and the mutually opposite circumferential directions 20, 22 of the dual clutch device 2 are indicated by means of corresponding arrows, wherein the circumferential directions 20, 22 can also be referred to as directions of rotation, and the dual clutch device 2 has an axis of rotation 24 which extends in mutually opposite axial directions 12, 14.
The dual clutch device 2 has a clutch input hub 26, which is or can be brought into rotary driving connection with the drive unit 4 and is connected for conjoint rotation by means of a rotary driving disk 28 which is arranged on the clutch input hub 26 for conjoint rotation and extends outward in a radial direction 16. The rotary driving disk 28 is in releasable rotary driving connection with the external outer plate carrier (described in greater detail below) of the dual clutch device 2, wherein this is accomplished in the illustrated embodiment by means of a toothing on the rotary driving disk 28, which toothing is situated on the outside in radial direction 16 and engages in a toothing on the external outer plate carrier, wherein the rotary driving disk 28 is fixed on the external outer plate carrier in axial direction 12 by means of a retaining ring 30.
The dual clutch device 2 has an outer multiplate clutch 32 and an inner multiplate clutch 34, wherein the multiplate clutches 32, 34 are formed substantially by plate packs comprising outer plates and inner plates, wherein the plate packs of the outer and inner multiplate clutches 32, 34 overlap in an axial region, it also being possible to say that the outer multiplate clutch 32 and the inner multiplate clutch 34 are arranged in a nested manner in the radial direction 16, 18.
The outer multiplate clutch 32 is assigned an external outer plate carrier 36, which has a substantially tubular plate-carrying section 38 having an internal toothing for arrangement of the outer plates of the outer multiplate clutch 32 for conjoint rotation, and a radial supporting section 40, which adjoins plate-carrying section 38 in axial direction 14 and, starting from plate-carrying section 38, extends inward in radial direction 18 so as to be connected to a clutch hub 42 for conjoint rotation. Moreover, the outer multiplate clutch 32 is assigned an inner plate carrier 44, which has a substantially tubular plate-carrying section 46 and a radial supporting section 48, which adjoins plate-carrying section 46 in axial direction 12 and extends inward in radial direction 18 so as to be in rotary driving connection with the first transmission input shaft 8 via a first clutch output hub 50. Consequently, the outer multiplate clutch 32 is designed in such a way that it serves for selective torque transmission between the drive unit 4 and the first transmission input shaft 8.
In contrast, the inner multiplate clutch 34 serves for selective torque transmission between the drive unit 4 and the second transmission input shaft 10. Thus, the inner multiplate clutch 34 is assigned an internal outer plate carrier 52 and an inner plate carrier 54, wherein the latter has a substantially tubular plate-carrying section 56 and a radial supporting section 58 adjoining plate-carrying section 56 in axial direction 12. Starting from plate-carrying section 56, radial supporting section 58 extends inward in radial direction 18 as far as a second clutch output hub 60, by means of which the inner plate carrier 54 of the inner multiplate clutch 34 is in rotary driving connection with the second transmission input shaft 10.
The internal outer plate carrier 52 has a substantially tubular plate-carrying section 62, which has an internal toothing for receiving the outer plates of the inner multiplate clutch 34 for conjoint rotation. In axial direction 14, a connecting section 64 adjoins plate-carrying section 62, extending inward in radial direction 18, starting from plate-carrying section 62. On the side of the connecting section 64 which faces away from plate-carrying section 62 there is an adjoining axial section 66 of the internal outer plate carrier 52, which is consequently arranged offset inward in radial direction 18 relative to plate-carrying section 62.
Moreover, the internal outer plate carrier 52 has fastening tongues 68, which are spaced apart from one another in the circumferential direction 20, 22 and are provided at least in part on the axial section 66 or at least partially form the axial section 66. Here, the fastening tongues 68 each have a first tongue section 70, which is situated substantially in the axial section 66 and consequently likewise extends in axial direction 14, and a second tongue section 72, which is angled relative to the first tongue section 70. The second tongue section 72 extends substantially parallel to the radial supporting section 40 of the external outer plate carrier 36 and, starting from the first tongue section 70, extends inward in radial direction 18 as far as a free end 74. As can be seen from the figures, the opposite end of the fastening tongues 68 from the free end 74 ends not only before the plate-carrying section 62 of the internal outer plate carrier 52 but also before the connecting section 64 connecting the plate-carrying section 62 of the internal outer plate carrier 52 to the axial section 66, and it is therefore also possible to refer in connection with the connecting section 64 to a connecting section 64 which runs around continuously in the circumferential direction 20, 22 or is ring-shaped.
The internal outer plate carrier 52 is fastened for conjoint rotation on the radial supporting section 40 of the external outer plate carrier 36, wherein the fastening for conjoint rotation can be accomplished in any way, although it is preferred if the internal outer plate carrier 52 is welded or - as illustrated in Figures 3 and 4 - riveted to the radial supporting section 40 of the external outer plate carrier 36. In this case, the fastening of the internal outer plate carrier 52 on the radial supporting section 40 of the external outer plate carrier 36 for conjoint rotation is accomplished by means of the fasting tongues 68, to be more precise the second tongue sections 72 of the fastening tongues 68, more specifically with the formation of a common subsection 76 of the radial supporting section 40 of the external outer plate carrier 36, by means of which both the internal and the external outer plate carrier 52, 36 can be supported or are supported in the radial direction 16, 18 on the clutch hub 42.
Both the outer multiplate clutch 32 and the inner multiplate clutch 34 are assigned a force transmission element 78, 80, respectively, for transmitting an actuating force to the outer and inner multiplate clutches 32, 34. The two force transmission elements 78, 80 are each designed as formed sheet-metal parts, wherein the two force transmission elements 78, 80 can each be driven by means of a hydraulically drivable piston 82, 84. As can be seen from Figure 1, the pistons 82, 84 are each formed integrally with the associated force transmission element 78, 80 formed by a formed sheet-metal part. Each of the two pistons 82, 84 is assigned a pressure space 86, 88, which can be pressurized with a hydraulic medium, and a pressure compensating space 90, 92, wherein the latter serve to achieve at least partial centrifugal oil compensation.
Pressure space 86 is delimited in axial direction 12 by piston 82 and in axial direction 14 by the radial supporting section 40 of the external outer plate carrier 36, more precisely by the common subsection 76 of radial supporting section 40. Pressure compensating space 90 is delimited in axial direction 12 by a partition wall 94 and in axial direction 14 by piston 82. Pressure space 88, on the other hand, is delimited in axial direction 12 by piston 84 and in axial direction 14 by the partition wall 94. Consequently, the pressure compensating space 90 of piston 82 is delimited with respect to the pressure space 88 of piston 84 by the partition wall 94, wherein the partition wall 94 in each case directly delimits pressure compensating space 90 and pressure space 88. In radially inward direction 18, the partition wall 94 is arranged or fastened on the clutch hub 42.
The partition wall 94 does not have any loadbearing or supporting function in the radial direction 16, 18 with respect to the external outer plate carrier 36 and the internal outer plate carrier 52, and this applies in a corresponding way to the inner plate carriers 44 and 54. On the contrary, the outer plate carriers 36, 52 are supported in the radial direction 16, 18 on the clutch hub 42 by means of the common subsection 76, already mentioned above, of the radial supporting section 40 of the external outer plate carrier 36. Moreover, the partition wall 94 is of thinner- walled design than the radial supporting section 40 of the external outer plate carrier 36 or at least of thinner- walled design than the common subsection 76 of radial supporting section 40. It can furthermore be seen from Figure 1 that pressure compensating space 90 and pressure space 86, which are assigned to piston 82, are arranged in such a way as to be at least partially nested in the radial direction 16, 18. In the embodiment shown here, this applies in a corresponding way to piston 84, the pressure compensating space 92 and pressure space 88 of which are arranged in an at least partially nested manner in the radial direction 16, 18. The radial nesting, which ultimately leads to an axial region of overlap, is achieved by corresponding shaping of the respective pistons 82 and 84.
The force transmission element 78 assigned to the outer multiplate clutch 32 has a first radial section 96 on the outside in radial direction 16, a second radial section 98, which follows the first radial section 96 inward in radial direction 18, and a third radial section 100, which follows the second radial section 98 inward in radial direction 18 and is formed completely or at least partially by piston 82. The first radial section 96 is designed to run around continuously or in the form of a ring in the circumferential direction 20, 22. In contrast, apertures or windows spaced apart from one another in the circumferential direction 20, 22 are provided in the second radial section 98, wherein, in the example under consideration, the term windows 102 should be used since the apertures are completely surrounded by an edge and therefore these are not merely lateral notches in force transmission element 78. In this case, the first and second radial sections 96, 98 are formed integrally with one another. The third radial section 100, which is connected to the first radial section 96 by means of the second radial section 98, is in turn designed to run around continuously or in the form of a ring in the circumferential direction 20, 22, wherein the third radial section 100 is formed integrally with the first and second radial sections 96, 98 and - in the embodiment illustrated - integrally with piston 82, and it is therefore also possible to speak of an integral force transmission element 78.
The internal outer plate carrier 52 extends through the apertures or windows 102 in the second radial section 98 of force transmission element 78 in axial direction 14. To be more precise, the fastening tongues 68 extend in the axial direction 12, 14 through the apertures or windows 102 so as to be fastened for conjoint rotation in the manner already described above on the radial supporting section 40 of the external outer plate carrier 36 on the side of force transmission element 78 which faces away from the inner multiplate clutch 34 by means of the second tongue section 72, wherein the internal outer plate carrier 52 is preferably also fixed or held in the axial directions 12, 14 on the radial supporting section by the fastening.
It can furthermore be seen from the figures that the external outer plate carrier 36, the internal outer plate carrier 52 and force transmission element 78 form a coherent module, on which force transmission element 78 is held captive by positive engagement simply by fastening the internal outer plate carrier 52 on the radial supporting section 40 of the external outer plate carrier 36 by means of the fastening tongues 68. In other words the force transmission element 78 in this module can no longer accidentally become detached from the module in one of the axial directions 12, 14, especially since fastening brings about not only fastening for conjoint rotation but also fastening of the internal outer plate carrier 52 on the radial supporting section 40 of the external outer plate carrier 36 with fixing in the axial direction 12, 14.
It is also apparent from the figures that the force transmission element 78 is inclined, curved or offset in the direction of the outer multiplate clutch 32, i.e. here in axial direction 12, in particular relative to the second radial section 98, in a radial region 104 of the connecting section 64 connecting plate-carrying section 62 to the offset axial section 66, in order to make good use of the free space obtained by means of the axial section 66 offset inward in radial direction 18, to provide a relatively stiff force transmission element 78 with a reduced hysteresis behavior, and to achieve a compact and space-saving construction of the dual clutch device 2.
Force transmission element 78 is in rotary driving connection with the external outer plate carrier 36, wherein the rotary driving connection is preferably achieved by means of positive engagement. In principle, two possibilities come into consideration here. On the one hand, the rotary driving connection can be brought about indirectly via the fastening tongues 68 extending through the apertures or windows 102, said fastening tongues, for their part, being fastened for conjoint rotation on the external outer plate carrier 36 or the radial supporting section 40 thereof. This would have the advantage that it is possible to dispense with additional means between the external outer plate carrier 36 and the force transmission element 78 for achieving the rotary driving connection, and this would result in a simplified construction and simplified manufacture. In this variant embodiment, the fastening tongues 68 extending into the apertures or windows 102 could be supported by means of their edge facing in at least one of the circumferential directions 20, 22 on the edge of the apertures or windows 102 which face in a circumferential direction 20 or 22 in order to transmit torque.
As an alternative, means for achieving the rotary driving connection between the external outer plate carrier 36 and force transmission element 78 can be provided at some other location, while force transmission element 78 is in rotary driving connection with the external outer plate carrier 36 with permanent spacing of the internal outer plate carrier 52 or of the fastening tongues 68 thereof from the respective edge of the apertures or windows 102 in both circumferential directions 20, 22. This can be accomplished, for example, by appropriately larger dimensioning of the apertures or windows 102 in the circumferential direction 20, 22 in relation to the dimensions of the fastening tongues 68 in the circumferential directions 20, 22 in order to effect permanent spacing of the fastening tongues 68 from the edge of the apertures or windows 102. The means for achieving the positive rotary driving connection between force transmission element 78 and the external outer plate carrier 36 could also consist in that force transmission element 78 has a toothing 106 engaging in the toothing of the plate-carrying section 38 of the external outer plate carrier 36, as shown by way of example in Figure 2.
The variant embodiment in which the rotary driving connection between the external outer plate carrier 36 and force transmission element 78 is not accomplished indirectly via the fastening tongues 68 and the apertures or windows 102 has the advantage that any dimensional deviations in the fastening of the fastening tongues 68 on the radial supporting section 40 of the external outer plate carrier 36 do not have any effect on the play of force transmission element 78 in the circumferential direction 20, 22 in relation to the external outer plate carrier 36; on the contrary, the play is determined exclusively by the means for achieving the rotary driving connection, that is to say, for example, the toothing 106. It has also been found that manufacture, in particular the fastening of the internal outer plate carrier 52 on the radial supporting section 40 of the external outer plate carrier 36, is simplified in this way. LIST OF REFERENCE SIGNS
2 dual clutch device
4 drive unit
6 transmission
8 first transmission input shaft
10 second transmission input shaft
12 axial direction
14 axial direction
16 radial direction
18 radial direction
20 circumferential direction
22 circumferential direction
24 axis of rotation
26 clutch input hub
28 rotary driving disk
30 retaining ring
32 outer multiplate clutch
34 inner multiplate clutch
36 external outer plate carrier
38 plate-carrying section
40 radial supporting section
42 clutch hub
44 inner plate carrier
46 plate-carrying section
48 radial supporting section
50 first clutch output hub
52 internal outer plate carrier
54 inner plate carrier
56 plate-carrying section
58 radial supporting section
60 second clutch output hub
62 plate-carrying section
64 connecting section
66 axial section
68 fastening tongues
70 first tongue section 72 second tongue section
74 free end
76 common subsection
78 force transmission element
80 force transmission element
82 piston
84 piston
86 pressure space
88 pressure space
90 pressure compensating space
92 pressure compensating space
94 partition wall
96 first radial section
98 second radial section
100 third radial section
102 aperture/window
104 radial region
106 toothing

Claims

PATENT CLAIMS
1. A concentric dual clutch device (2) for arrangement in a drive train of a motor vehicle, between a drive unit (4) and a transmission (6), which clutch device has an outer multiplate clutch (32), assigned to a first transmission input shaft (8), for selective torque transmission between the drive unit (4) and the first transmission input shaft (8), and an inner multiplate clutch (34), assigned to a second transmission input shaft (10), for selective torque transmission between the drive unit (4) and the second transmission input shaft (10), wherein the inner multiplate clutch (34) is assigned an internal outer plate carrier (52) and the outer multiplate clutch (32) is assigned a force transmission element (78) for transmitting an actuating force to the outer multiplate clutch (32), characterized in that the internal outer plate carrier (52) extends through apertures or windows (102) in the force transmission element (78).
2. The concentric dual clutch device (2) as claimed in claim 1, characterized in that the internal outer plate carrier (52) extends in an axial direction (14) through the apertures or windows (102).
3. The concentric dual clutch device (2) as claimed in one of the preceding claims, characterized in that the internal outer plate carrier (52) is fastened against relative rotation, on the side of the force transmission element (78) which faces away from the inner multiplate clutch (34), on a radial supporting section (40) of an external outer plate carrier (36) assigned to the outer multiplate clutch (32), preferably being welded or riveted to the radial supporting section (40), particularly preferably forming a common subsection (76) of the radial supporting section (40), by means of which both the internal and the external outer plate carrier (52, 36) can be supported or are supported in the radial direction (16, 18).
4. The concentric dual clutch device (2) as claimed in claim 3, characterized in that the external outer plate carrier (36), the internal outer plate carrier (52) and the force transmission element (78) form a coherent module on which the force transmission element (78) is held captive by fastening the internal outer plate carrier (52) on the radial supporting section (40), preferably by positive engagement.
5. The concentric dual clutch device (2) as claimed in one of claims 3 or 4, characterized in that the internal outer plate carrier (52) has fastening tongues (68) which extend through the apertures or windows (102), wherein the fastening tongues (68) preferably end before a plate-carrying section (62) of the internal outer plate carrier (52) and/or are provided on an axial section (66) offset in the radial direction (16, 18), if appropriate inward in a radial direction (18), relative to a plate-carrying section (62) of the internal outer plate carrier (52), wherein the fastening tongues (68) particularly preferably end before a connecting section (64) connecting the plate- carrying section (62) to the offset axial section (66), and/or the force transmission element (78) is particularly preferably inclined, curved or offset in the direction of the outer multiplate clutch (32) in a radial region (104) of a connecting section (64) connecting the plate-carrying section (62) to the offset axial section (66).
6. The concentric dual clutch device (2) as claimed in claim 5, characterized in that the fastening tongues (68) have a first tongue section (70) and a second tongue section (72) angled relative to the first tongue section (70), by means of which the fastening tongues (68) are fastened on the radial supporting section (40), wherein the first tongue section (70) preferably extends in an axial direction (14) and/or the second tongue section (72) preferably extends parallel to the radial supporting section (40) and/or in the radial direction (16, 18), particularly preferably inward in a radial direction (18), starting from the first tongue section (70).
7. The concentric dual clutch device (2) as claimed in one of claims 3 to 6, characterized in that the force transmission element (78) is in rotary driving connection, if appropriate positive rotary driving connection, with the external outer plate carrier (36), wherein the force transmission element (78) is in rotary driving connection with the external outer plate carrier (36), preferably either with permanent spacing of the internal outer plate carrier (52), particularly preferably the fastening tongues (68) thereof, in both circumferential directions (20, 22) from the respective edge of the apertures or windows (102) and/or by means of a toothing (106) engaging in the toothing of a plate-carrying section (38) of the external outer plate carrier (36) or by means of the fastening tongues (68) extending through the apertures or windows (102).
8. The concentric dual clutch device (2) as claimed in one of the preceding claims, characterized in that the force transmission element (78), which may be designed as a formed sheet-metal part, has a first radial section (96), assigned to the outer multiplate clutch (32), and a second radial section (98), in which the apertures or windows (102) are provided, wherein the first radial section (96) is formed so as to run around continuously in the circumferential direction (20, 22) and is preferably formed integrally with the second radial section (98), and particularly preferably a third radial section (100) is provided, which is connected to the first radial section (96) by means of the second radial section (98), and is preferably formed so as to run around continuously in the circumferential direction (20, 22) and, if appropriate, is formed integrally with the first and second radial sections (96, 98).
9. The concentric dual clutch device (2) as claimed in one of the preceding claims, characterized in that the force transmission element (78) assigned to the outer multiplate clutch (32) and a force transmission element (80) assigned to the inner multiplate clutch (34) can each be actuated by at least one hydraulically drivable piston (82, 84), which is preferably formed integrally with the respective force transmission element (78, 80), wherein each of the pistons (82, 84) is assigned a pressure space (86, 88), and at least one of the pistons (82, 84) is assigned a pressure compensating space (90, 92) for achieving at least partial centrifugal oil compensation.
10. The concentric dual clutch device (2) as claimed in claim 9, characterized in that the pressure compensating space (90) of one piston (82) is delimited with respect to the pressure space (88) of the other piston (84) by a partition wall (94), wherein the partition wall (94) delimits the pressure compensating space (90) and the pressure space (88), in each case preferably directly, and/or is arranged on a clutch hub (42) of the dual clutch device (2).
11. The concentric dual clutch device (2) as claimed in claim 10, characterized in that the partition wall (94) does not have a loadbearing or supporting function in respect of one of the outer plate carriers (36, 52) or inner plate carriers (44, 54) of the multiplate clutches (32, 34), wherein the partition wall (94) is preferably of thinner-walled design than the radial supporting section (40) of the external outer plate carrier (36) and/or the common subsection (76) of the radial supporting section (40).
PCT/US2015/015811 2014-02-25 2015-02-13 Concentric dual clutch device WO2015130489A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201580009701.4A CN106030142B (en) 2014-02-25 2015-02-13 Parallel double clutch device

Applications Claiming Priority (4)

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DE102014002453.9 2014-02-25
DE102014002453 2014-02-25
DE102014014985.4A DE102014014985A1 (en) 2014-02-25 2014-10-09 Concentric double clutch device
DE102014014985.4 2014-10-09

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DE (1) DE102014014985A1 (en)
WO (1) WO2015130489A1 (en)

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FR3060682B1 (en) * 2016-12-21 2019-05-17 Valeo Embrayages INTAKE DISC TRAYS FOR A DUAL WET CLUTCH, MECHANISM AND CLUTCH SYSTEM, AND HYBRID TRANSMISSION CHAIN INCORPORATING SUCH A DISK HOLDER
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FR3082573B1 (en) * 2018-06-14 2020-07-10 Valeo Embrayages MULTI-DISC CLUTCH
DE102018122386A1 (en) * 2018-09-13 2020-03-19 Schaeffler Technologies AG & Co. KG Double clutch device for a drive train of a motor vehicle with fully hydraulic actuation
FR3095021B1 (en) * 2019-04-09 2023-03-24 Valeo Embrayages WET CLUTCH MECHANISM INCLUDING IMPROVED SEALING
WO2022207252A1 (en) * 2021-03-29 2022-10-06 Magna Pt B.V. & Co. Kg Multi-disc clutch arrangement with sheet-metal piston for actuating the clutches, in particular a triple-disc clutch

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CN106030142B (en) 2018-01-26
CN106030142A (en) 2016-10-12

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