dual clutch

Abstract

Double clutch (1) with a first partial clutch (2) comprising a first outer plate carrier (4), a first inner plate carrier (5) and a first plate pack (14) formed from the first outer plates (6) associated with the first outer plate carrier (4) and the first inner plates (7) associated with the first inner plate carrier (5), which can be actuated by means of a first actuating element (12), and a second partial clutch (3) comprising a second outer plate carrier (8), a second inner plate carrier (9) and a second plate pack (17) formed from the second outer plates (10) associated with the second outer plate carrier (8), which can be actuated by means of a second actuating element (13), wherein the first and the second outer plate carriers (4, 8) are coupled to each other in such a way that the first and the second outer plate carriers (4,8) are movable relative to each other in the axial direction and that a relative movement between the first and the second outer lamella carrier (4, 8) is blocked in the circumferential direction, or that the first and the second inner lamella carrier (5, 9) are coupled to each other in such a way that the first and the second inner lamella carrier (5, 9) are movable relative to each other in the axial direction and that a relative movement between the first and the second inner lamella carrier (5, 9) is blocked in the circumferential direction, characterized in that an actuating force for the first actuating element (12) and / or the second actuating element (13) is generated on the output side.

Description

[0001] The invention relates to a double clutch with a first partial clutch comprising a first outer lamella carrier, a first inner lamella carrier and a first lamella pack formed from the first outer lamella carrier and the first inner lamella carrier, which can be actuated by means of a first actuating element, and a second partial clutch comprising a second outer lamella carrier, a second inner lamella carrier and a second lamella pack formed from the second outer lamella carrier and the second inner lamella carrier, which can be actuated by means of a second actuating element.

[0002] Such coupling devices or double couplings are known from the prior art. In such an axial double coupling, the disc packs of the individual sub-couplings are axially adjacent and usually arranged in the same radial position. Actuation of the disc packs of the two sub-couplings typically occurs from opposite sides, with the sub-couplings or the disc packs of the sub-couplings usually arranged on a common central web. Alternatively, actuation from one side occurs either on the output side or the input side, by the actuating element for one of the two sub-couplings passing through the other sub-coupling. In such an arrangement, where the sub-couplings are arranged on the same outer disc carrier or on separate outer disc carriers that are rigidly connected to each other, so-called "crosstalk" can occur.Within the scope of this application, the term "crosstalk" is understood to mean that the power flow during the actuation of one partial coupling passes through at least one component of the other partial coupling. Crosstalk thus causes the actuation of one partial coupling to be at least partially transmitted to the other partial coupling.

[0003] As prior art, reference is made, for example, to DE 10 2011 009 419 A1, which discloses a double clutch with the features of the preamble of claim 1.

[0004] The invention is therefore based on the objective of providing an axial double coupling in which crosstalk is prevented.

[0005] To solve this problem, in a double clutch of the type mentioned at the outset, it is provided according to the invention that the first and the second outer lamella carriers are coupled to each other in such a way that the first and the second outer lamella carriers are movable relative to each other in the axial direction and that a relative movement between the first and the second outer lamella carriers is blocked in the circumferential direction, or that the first and the second inner lamella carriers are coupled to each other in such a way that the first and the second inner lamella carriers are movable relative to each other in the axial direction and that a relative movement between the first and the second inner lamella carriers is blocked in the circumferential direction.

[0006] According to the invention, the first and second outer lamella carriers or the first and second inner lamella carriers are coupled to each other in such a way that they are axially movable relative to each other, and that circumferential relative movement between them is blocked. The following refers to a coupling of motion between the first and second outer lamella carriers. Of course, all embodiments are transferable to a coupling of motion between the first and second inner lamella carriers.

[0007] According to the invention, this prevents the actuation of one partial clutch by its associated actuating element from causing so-called "crosstalk" to the other partial clutch. This occurs in the case of uneven actuation of the dual clutch when force is applied to a clutch pack, causing the inner and outer clutch plates of the pack to be axially compressed and supported on a side of the clutch pack opposite the actuating element. This support is usually provided by a support section of the outer clutch plate carrier. Since, in axially arranged partial clutches in a dual clutch, the outer clutch plate carriers of the individual partial clutches are connected to each other or formed as a single piece, the force applied to one partial clutch is transmitted to the common outer clutch plate carrier and can therefore crosstalk to the other partial clutch.Particularly in an internally actuated dual clutch, this means that applying force to a support section of the outer clutch plate carrier axially moves or deforms the common outer clutch plate carrier. This deformation causes the support section on the opposite side of the other clutch plate carrier to also move axially, resulting in a partial, albeit slight, actuation of the other clutch plate carrier. The force flow thus passes through both clutch plate carriers, meaning that actuation of one clutch plate carrier also affects the other.

[0008] Accordingly, the first and second outer plate carriers, which are assigned to the first and second partial clutches, are designed to be relatively movable relative to each other such that they are axially movable to a certain extent, but relative movement between the two outer plate carriers is blocked in the circumferential direction. This allows a force or torque to be transmitted from the first outer plate carrier to the second, with the first outer plate carrier being coupled, for example, to a drive unit, in particular a crankshaft or an input element. Crosstalk is thus prevented, since the two outer plate carriers are axially movable relative to each other when force is applied to one of the two partial clutches.The power flow therefore does not pass through both partial couplings, but each partial coupling has a partial power flow when actuated that does not overlap with the partial power flow of the other partial coupling.

[0009] It may be particularly preferred that at least one coupling device is provided which has at least one coupling element and at least one receptacle corresponding to the coupling element, wherein at least one coupling element is assigned to the first outer lamella carrier and at least one corresponding receptacle to the second outer lamella carrier and / or that at least one coupling element is assigned to the second outer lamella carrier and at least one corresponding receptacle to the first outer lamella carrier.

[0010] Accordingly, it can be provided that the two outer lamella carriers are coupled by means of a coupling device, so that they remain axially movable, but circumferential movement is blocked. The coupling device comprises at least one coupling element and a corresponding receptacle. The coupling element engages axially in sections or partially with the receptacle. Each outer lamella carrier has a coupling element and the other has the receptacle, so that the first and second outer lamella carriers can be coupled to each other via the coupling device. The axial mobility results from the fact that the coupling element can be inserted into the receptacle to varying degrees, so that the first and second outer lamella carriers can, in a sense, be extended and retracted telescopically in the axial direction.

[0011] In a further embodiment of the double clutch according to the invention, the at least one receptacle and the at least one coupling element can be formed as part of the toothing of the first or the second outer lamella carrier or arranged on the toothing of the first or the second outer lamella carrier. Accordingly, the coupling element and the receptacle, i.e., the coupling device, can be formed integrally with the first and the second outer lamella carrier. It is also possible for the coupling device to be formed separately from the first and the second outer lamella carrier. Thus, the coupling element can be assigned to the first or the second outer lamella carrier and couple them together. Particularly preferred is the coupling device formed as part of the toothing of the first and / or the second outer lamella carrier.Of course, hybrid designs are possible, in which at least one mounting element is formed as a single unit with one of the outer slat supports and the coupling element is separate, or vice versa. It is also possible to design the coupling device separately on the first outer slat support and as a single unit on the second outer slat support. Naturally, all technically feasible combinations are also possible.

[0012] In both cases, at least one coupling element projects axially from the first or second outer lamella carrier. The coupling element thus projects, preferably in the form of a finger, from the first or second outer lamella carrier and extends axially towards the other outer lamella carrier. The coupling element can particularly preferably be designed as part of the toothing, for example, as an extended tooth root of the toothing that extends towards the other outer lamella carrier. The receptacle can also preferably be designed as part of the toothing, such that it is formed by the inner surfaces of the tooth flanks and a tooth, i.e., an inner region of the toothing of the outer lamella carrier.Thus, the coupling element, designed as an extended tooth base, can engage telescopically in the receptacle formed by the inside of the tooth flanks and the tooth of the toothing of the opposite outer lamella carrier, so that the two outer lamella carriers are movable in the axial direction relative to each other, while being blocked in the circumferential direction.

[0013] The double clutch according to the invention particularly preferably has several coupling elements in the circumferential direction. Naturally, the opposing outer plate carrier accordingly has several receptacles distributed around the circumference. For example, it can be provided that each tooth root of the first outer plate carrier is designed as a coupling element and that each tooth of the gearing of the second outer plate carrier forms a receptacle or has one such receptacle. Of course, it is also possible that both the first outer plate carrier has coupling elements as extended tooth roots and the second outer plate carrier has coupling elements as extended tooth roots that engage in the corresponding receptacles, i.e., inner tooth surfaces, of the other outer plate carrier.

[0014] Advantageously, the first outer lamella carrier and the second outer lamella carrier are rotated relative to each other in the circumferential direction by one tooth width of a tooth of the toothing of the first or the second outer lamella carrier, and at least one corresponding receptacle is formed by the inside of the toothing of the second or the first outer lamella carrier, into which the at least one coupling element engages.

[0015] The rotation of the first outer lamella carrier relative to the second outer lamella carrier ensures that each tooth of the first outer lamella carrier meets a tooth base of the second outer lamella carrier, allowing the coupling device to engage.

[0016] The dual clutch according to the invention is further developed in such a way that an actuating force for the first actuating element and / or the second actuating element is generated on the output side. This advantageously ensures that the actuating force, for example a hydraulically generated actuating force, can be transmitted to the actuating elements via the first or second output shaft, i.e., the first or the second transmission input shaft, in particular the transmission input shaft designed as a hollow shaft.

[0017] It is particularly preferred that the actuating force for the first and / or the second actuating element is transmitted by means of a central release bearing and / or hydraulically. The first actuating element and / or the second actuating element can thus be actuated either hydraulically or by means of a central release bearing. In the case of hydraulic actuation of the actuating element, a pressure chamber is provided into which, for example, a working fluid can be supplied via the transmission input shaft, which is designed as a hollow shaft, or an associated hub, so that the pressure in the pressure chamber can be influenced.

[0018] A particularly preferred embodiment of the double clutch according to the invention provides that the two partial clutches are axially adjacent. Preferably, the two actuating elements are further arranged between the two partial clutches. The two actuating elements point away from each other and towards the friction plates of the two partial clutches. The double clutch is thus an axial, internally actuated double clutch. This advantageously enables an axial double clutch to be internally actuated by actuating elements. This allows for a central arrangement of the two actuating elements for internal actuation. Likewise, with internal actuation, a through-cut solution, in which at least one actuating element, for example a pressure pot, must pass through a friction plate of the other partial clutch, can be avoided.

[0019] The invention is explained in more detail below with reference to an exemplary embodiment and the drawings. The drawings are schematic representations and show: Fig. 1 a coupling device according to the invention in the open position; Fig. 2 the coupling device according to the invention of Fig. 1 in the closed position of a first partial coupling; Fig. 3 a perspective view of an outer lamella carrier of the coupling device of Fig. 1; and Fig. 4 an axial view of an outer lamella carrier of the coupling device of Fig. 1.

[0020] Fig. Figure 1 shows a double coupling 1 with a first partial coupling 2 and a second partial coupling 3. The first partial coupling 2 comprises a first outer lamella carrier 4, a first inner lamella carrier 5, as well as outer lamellae 6 assigned to the first outer lamella carrier 4 and inner lamellae 7 assigned to the first inner lamella carrier 5.

[0021] Accordingly, the second partial coupling 3 has a second outer lamella carrier 8, a second inner lamella carrier 9, and second outer lamellae 10 associated with the second outer lamella carrier 8 and second inner lamellae 11 associated with the second inner lamella carrier 9. A first actuating element 12 and a second actuating element 13 are arranged between the first partial coupling 2 and the second partial coupling 3, respectively, and are associated with the first partial coupling 2 and the second partial coupling 3. By generating a specific actuating force, the first actuating element 12 can be moved towards a first lamella pack 14, which is formed from the first outer lamellae 6 and the first inner lamellae 7. A force introduced into the first lamella pack 14 by means of the first actuating element 12 is supported at a first support section 15 of the first outer lamella carrier 4.

[0022] Accordingly, an actuating force can be introduced by the actuating element 13 into a second lamellar assembly 17, wherein the actuating force introduced by the second actuating element 13 is supported by a second support section 16. The lamellar assembly is formed from the second outer lamellae 10 and the second inner lamellae 11.

[0023] The double clutch 1 further comprises a coupling device 18 which couples the first outer lamella carrier 4 to the second outer lamella carrier 8 in such a way that a relative movement between the first outer lamella carrier 4 and the second outer lamella carrier 8 is blocked in the circumferential direction, but they are relatively movable to each other in the axial direction.

[0024] Fig. Figure 2 shows the closed state or closed position of the first partial coupling 2. It is evident that the first actuating element 12 introduces an actuating force into the lamellar assembly 14 and supports it against the first support section 15. This support of the actuating force deforms the first outer lamellar carrier 2, or moves it axially away from the second partial coupling 3. The coupling device 18 enables relative movement between the first outer lamellar carrier 4 and the second outer lamellar carrier 8 in the axial direction, thus preventing the force from being transmitted from the first partial coupling 2 to the second partial coupling 3.

[0025] Fig. Figure 3 shows a perspective view of the first outer lamella carrier 4 and the second outer lamella carrier 8 of the double coupling 1 of Fig. 1. The first outer lamella carrier 4 and the second outer lamella carrier 8 are spaced apart axially. The coupling device 18 has first coupling elements 19 and second coupling elements 20. The first coupling elements 19 are assigned to the first outer lamella carrier 4 and the second coupling elements 20 are assigned to the second outer lamella carrier 8. Furthermore, the coupling device 18 has first receptacles 21 and second receptacles 22. The first receptacles 21 are assigned to the first outer lamella carrier 4 and the second receptacles 22 to the second outer lamella carrier 8.

[0026] The first outer lamella carrier 4 and the second outer lamella carrier 8 are evidently rotated circumferentially by the width of one tooth 23 of a toothing 24 of the first or the second outer lamella carrier 4, 8. Therefore, the first coupling elements 19 of the first outer lamella carrier 4 can engage in the second receptacles 22 of the second outer lamella carrier 8, and the second coupling elements 20 can engage in the first receptacles 21 of the first outer lamella carrier 4. The proportion of the first and second coupling elements 19, 20 that engages in the first and second receptacles 21, 22 determines how closely the first outer lamella carrier 4 and the second outer lamella carrier 8 are pushed together. This results in a telescopic coupling of the two outer lamella carriers 4, 8, allowing them to move axially relative to each other.The coupling device 28 clearly prevents the two outer lamella carriers 4, 8 from being rotated relative to each other in the circumferential direction. This prevents crosstalk from force application to the first or second partial coupling 2, 3 to the other partial coupling 2, 3. The coupling elements 19, 20 are always at least partially engaged with the corresponding receptacles 21, 22. The degree of engagement depends on the closed state of the double coupling 1 or the partial couplings 2, 3.

[0027] Fig. Figure 4 shows the first outer lamellar carrier 4 of the double coupling 1 in an axial section. Fig.Figure 4 shows that the first coupling elements 19 project axially from the toothing 24, in particular the tooth roots, of the first outer lamella carrier 4. The first receptacles 21 are formed by the internal toothing, in particular the inner surface of a tooth and the tooth flanks adjoining the tooth. Since the first outer lamella carrier 4 and the second outer lamella carrier 8 are rotated relative to each other by the width of a tooth 23, the second coupling elements 20 engage in the first receptacles 21, and the first coupling elements 19 engage in the second receptacles 22. Thus, rotation is prevented in the circumferential direction, allowing a torque or force to be transmitted from the first outer lamella carrier 4 to the second outer lamella carrier 8 and vice versa.In the axial direction, depending on the degree of engagement of the coupling elements 19, 20 in the receptacles 20, 22, an axial mobility of the first outer lamella carrier 4 relative to the second outer lamella carrier 8 can be achieved. Reference symbol list 1 dual clutch 2 first partial coupling 3 second partial coupling 4 first outer lamella carrier 5 first inner slat carrier 6 first outer lamella 7 first inner lamella 8 second outer lamella carrier 9 second inner slat carrier 10 second outer slat 11 second inner lamella 12 first actuating element 13 second actuating element 14 first slat package 15 first support section 16 second support section 17 second slat package 18 Coupling device 19 first coupling element 20 second coupling element 21 first recording 22 second recording 23 teeth 24 teeth

Claims

[1] Double clutch (1) comprising a first partial clutch (2) comprising a first outer plate carrier (4), a first inner plate carrier (5) and a first plate pack (14) formed from the first outer plates (6) associated with the first outer plate carrier (4) and the first inner plates (7) associated with the first inner plate carrier (5), which can be actuated by means of a first actuating element (12), and a second partial clutch (3) comprising a second outer plate carrier (8), a second inner plate carrier (9) and a second plate pack (17) formed from the second outer plates (10) associated with the second outer plate carrier (8), which can be actuated by means of a second actuating element (13), wherein the first and the second outer plate carriers (4, 8) are coupled to each other in such a way that the first and the second outer plate carriers (4,8) are movable relative to each other in the axial direction and that a relative movement between the first and the second outer lamella carrier (4, 8) is blocked in the circumferential direction, or that the first and the second inner lamella carrier (5, 9) are coupled to each other in such a way that the first and the second inner lamella carrier (5, 9) are movable relative to each other in the axial direction and that a relative movement between the first and the second inner lamella carrier (5, 9) is blocked in the circumferential direction, , characterized by , that an actuating force is generated on the output side for the first actuating element (12) and / or the second actuating element (13). [2] Dual clutch according to claim 1, characterized by, that at least one coupling device (18) is provided, which has at least one coupling element (19, 20) and at least one receptacle (21, 22) corresponding to the coupling element (19, 20), wherein at least one coupling element (19, 20) is assigned to the first outer lamella carrier (4) and at least one corresponding receptacle (21, 22) is assigned to the second outer lamella carrier (8) and / or that at least one coupling element (19, 20) is assigned to the second outer lamella carrier (8) and at least one corresponding receptacle (21, 22) is assigned to the first outer lamella carrier (4) or that at least one coupling element is assigned to the first inner lamella carrier (5) and at least one corresponding receptacle is assigned to the second inner lamella carrier (9) and / or that at least one coupling element is assigned to the second inner lamella carrier (9) and at least one corresponding receptacle is assigned to the first inner lamella carrier (5). [3] Dual clutch according to claim 2, characterized by, that the at least one receptacle (21, 22) and that at least one coupling element (19, 20) is formed as part of a toothing (24) of the first or the second outer lamella carrier (4, 8) or is arranged on the toothing (24) of the first or the second outer lamella carrier (4, 8) or that at least one coupling element is formed as part of a toothing of the first or the second inner lamella carrier (5, 9) or is arranged on the toothing of the first or the second inner lamella carrier (5, 9). [4] Dual clutch according to claim 3, characterized by , that at least one coupling element (19, 20) projects axially from the first or second outer lamella carrier (4, 8) or the first or second inner lamella carrier (5, 9). [5] Dual clutch according to claim 4, characterized by, that the first and the second outer lamella carrier (4, 8) are rotated relative to each other circumferentially by one tooth width of a tooth (23) of the toothing (24) of the first or the second outer lamella carrier (4, 8), and that the at least one corresponding receptacle (21, 22) is formed by the inside of the toothing (3) of the second or the first outer lamella carrier (4, 8), into which the at least one coupling element (19, 20) engages, or that the first and the second inner lamella carrier (5, 9) are rotated relative to each other circumferentially by one tooth width of a tooth of the toothing of the first or the second inner lamella carrier (5, 9), and that the at least one corresponding receptacle is formed by the inside of the toothing of the second or the first inner lamella carrier (5, 9), into which the at least one coupling element engages. [6] Dual clutch according to one of the preceding claims, characterized by, that the actuating force for the first and / or the second actuating element (12, 13) is generated by means of a central release bearing and / or hydraulically. [7] Dual clutch according to one of the preceding claims, characterized by , that the first partial coupling (2) and the second partial coupling (3) are axially adjacent. [8] Dual clutch according to one of the preceding claims, characterized by , that the first and second actuating elements (12, 13) are arranged between the first and second partial couplings (2, 3).

Images