Dual clutch device for a drive train of a motor vehicle with fully hydraulic actuation

Abstract

A dual-clutch device for a drive train of a motor vehicle with fully hydraulic actuation, comprising a first radially outer partial clutch (2) and a second partial clutch (3) located radially inside the first partial clutch (2), wherein pressure chambers (4, 5) of the first and second partial clutches (2, 3) and / or centrifugal oil chambers (6, 7) of the first and second partial clutches (2, 3) are arranged radially inside the second partial clutch (3), and a pressure chamber (5) of the second partial clutch (3) and a centrifugal oil chamber (6) of the first partial clutch (2) are delimited by a common partition wall (16), characterized in that the partition wall is designed as a seal carrier (16) on which a sealing element (22) with two sealing lips (17, 20) is arranged, wherein the first sealing lip (17) seals the pressure chamber (5) of the second partial clutch (3) and the second sealing lip (20 seals the centrifugal oil chamber (6) of the first partial clutch (2). seals.

Description

The invention relates to a dual clutch device for a drive train of a motor vehicle with fully hydraulic actuation, comprising a first radially outer clutch part and a second clutch part located radially inside the first clutch part, wherein pressure chambers of the first and the second clutch part and / or centrifugal oil chambers of the first and the second clutch part are arranged radially inside the second clutch part and a pressure chamber of the second clutch part and a centrifugal oil chamber of the first clutch part are bounded by a common partition wall.WO 2015 / 130489 A1 discloses a concentric dual clutch device for arrangement in a drive train of a motor vehicle between a drive unit and a transmission. This dual clutch device has an outer multiplate clutch and an inner multiplate clutch, wherein the outer multiplate clutch is assigned to an outer outer plate carrier and an inner plate carrier is assigned to the inner multiplate clutch. Both the outer and the inner multiplate clutch each have a force transmission unit for transmitting an actuating force to the outer and inner multiplate clutch. The two force transmission elements are each designed as a sheet metal formed part, wherein the two force transmission elements can be driven via a hydraulically actuatable piston each. The pistons are each assigned a pressure chamber, which is pressurized with a hydraulic medium, and a pressure compensation chamber, the latter serving to achieve an at least partial flow oil compensation. The pressure chamber of the inner multiplate clutch and the pressure compensation chamber of the outer multiplate clutch are separated in the radial direction by a common separating wall.As further prior art, reference is made to DE 10 2004 058 872 A1 and DE 10 2016 211 888 A1, each of which discloses a dual clutch device for a drive train of a motor vehicle with fully hydraulic actuation.Within a limited installation space, the hydraulic actuating system, consisting of pressure and centrifugal oil spaces of the two partial clutches, including all seals, must be accommodated in such a way that the required actuating forces are achieved and a virtually complete centrifugal oil compensation is achieved.The invention is based on the object of specifying a dual clutch device in which the installation space can be reduced further.According to the invention, the object is achieved in that the partition wall is designed as a seal carrier on which a sealing element with two sealing lips is arranged, wherein the first sealing lip seals off the pressure chamber of the second partial clutch and the second sealing lip seals off the centrifugal oil chamber of the first partial clutch. Since the two sealing lips are integrated in one component, this saves both installation space and costs.Advantageously, the seal carrier forms the second pressure chamber of the second partial clutch with a pressure pot of the second partial clutch and a rotor, wherein the first sealing lip of the sealing element presses against the pressure pot of the second partial clutch, while a sealing ring is arranged opposite the rotor, which is pressed against the rotor by the pressure pot of the second partial clutch. Since both the pressure chamber of the second clutch element and a centrifugal oil chamber of the first clutch element, which both form independent hydraulic chambers, are sealed off by a common seal carrier, additional components can be dispensed with.In one embodiment, the seal carrier forms the centrifugal oil chamber of the first partial coupling with a sealing plate, the rotor and the pressure pot of the first partial coupling, wherein the second sealing lip of the seal element presses against a sealing plate fastened to the pressure head of the first partial coupling. As a result, the inner and outer diameters of the centrifugal oil chambers and of the pressure chambers can be matched exactly to one another, wherein these sheet metal parts, including their seals, are nested one inside the other.In one embodiment, the sealing element is connected by the two sealing lips to one end of the seal carrier in a materially integral manner. This ensures that the sealing effect is reliably ensured even during operation of the dual clutch device, in which the hydraulic fluid is moved within the dual clutch device.In a particularly cost-effective embodiment, the sealing element with the sealing lips is designed as a rubber composite part.In one variant, the seal carrier is pressed with its end free from sealing lips onto the rotor. This press fit is designed in such a way that it fixes the radially extending seal carrier on the one hand even when it is actuated and seals the pressure chamber of the second partial clutch with respect to the centrifugal oil chamber of the first partial clutch on the other hand. An additional seal on the inner diameter of the seal carrier can thus be omitted, which additionally saves axial installation space and costs.In a further development, the seal carrier has an axially extending arm on an outer diameter, on which arm the seal element is positioned, wherein the sealing plate is mounted on the second sealing lip so as to be movable axially over the arm. As a result, when the first partial coupling is actuated, the sealing plate can slide over the sealing lip and enter the seal carrier.In a further embodiment, the sealing plate is connected in a materially integral manner to the pressure pot of the first partial clutch.The invention permits numerous embodiments. One of these will be explained in more detail with reference to the figures shown in the drawing.It shows: FIG. 1 shows an exemplary embodiment of the dual clutch device according to the invention, FIG. 2 shows a detail of the dual clutch device according to FIG. 1.FIG. 1 shows an exemplary embodiment of the wet dual clutch device according to the invention, which is fully hydraulically actuated and is positioned between a drive and a transmission in a drive train of a vehicle. The dual clutch device 1 consists of a first partial clutch 2 which is located radially on the outside. A second partial clutch 3 is arranged radially inside the first partial clutch 2. Located further radially inside the second clutch element 3 are the hydraulic chambers of the two clutch elements 2, 3, consisting of the pressure chambers 4, 5 and the centrifugal oil chambers 6, 7.The first partial clutch 2 is held by a pressure pot 8 which encloses a compression spring pack 9 on which a first piston 10 is arranged. The second partial clutch 3 has a similar construction, which has a pressure pot 11 which carries a second compression spring pack 12 in which a piston 13 is movably mounted. The pressure chamber 4 of the first clutch element 2 is formed between the pressure pot 8 and a rotor 14. Above the compression spring pack 9, the centrifugal oil chamber 6 of the first partial clutch 2 is sealed. In contrast, the pressure chamber 5 of the second clutch element 3 is positioned below the pressure pot 11 of the second clutch element 3, while the centrifugal oil chamber 7 of the second clutch element 3 extends axially above the compression spring pack 12 of the second clutch element 3 and the pressure pot 11 of the second clutch element 3. A hollow shaft 15 is supported below the rotor 14.FIG. 2 shows a detail according to FIG. 1, which shows in particular the pressure chambers 4, 5 or the centrifugal oil chambers 6, 7 of the two partial clutches 2, 3. In order to be constructed as compactly as possible, a seal carrier 16 is used as the central element. This forms, together with the pressure pot 11 of the second partial clutch 3 and the rotor 14, the pressure chamber 5 of the second partial clutch 3. In addition to the rotor 14, the pressure chamber 4 of the first partial clutch 2 is sealed off by a lip sealing ring 18. Furthermore, the seal carrier 16, together with a sealing plate 19, the rotor 14 and the pressure pot 8 of the first partial coupling 2, forms the centrifugal oil chamber 6 of the first partial coupling 2. For this purpose, the seal carrier 16 has on its outer diameter an arm 21, which extends axially to the compression spring packs 9, 12 and on which a sealing element 22 is injection-molded, which has the first sealing lip 17 for sealing on the pressure pot 11 of the second partial clutch 2 and the second sealing lip 20 for sealing the centrifugal oil space 6 of the first partial clutch 2 on the sealing plate 19. The sealing plate 19 is welded to the pressure pot 8 of the first partial clutch 2. The seal carrier 16 thus carries both the sealing lip 17 for the pressure chamber 5 of the second partial coupling 3 and the sealing lip 20 for the centrifugal oil chamber 6 of the first partial coupling 2.The seal carrier 16 is pressed onto the rotor 14 on the inner diameter, wherein the press fit is designed such that it fixes the seal carrier 16 on the one hand even when the dual clutch device 1 is actuated and on the other hand seals the pressure chamber 5 of the second clutch element 2 with respect to the flowing oil chamber 6 of the first clutch element 2. An additional seal on the inner diameter of the seal carrier 16 can thus be omitted. The seal carrier 16 is formed in such a way that, when the first partial clutch 2 is actuated, the sealing plate 19 slides over the second sealing lip 20 and dips axially into the seal carrier 16. This is achieved in that the first sealing lip 17 is arranged slightly elevated radially above the second sealing lip 20, wherein the two sealing lips 17, 20 are each formed at one end of the arm 21 of the seal carrier 16.Thus, the sealing element 22 formed as a rubber composite part can be used for sealing for both hydraulic spaces. In addition, the sealing element 22 is a comparatively small part compared to the pressure pots 8, 11, as a result of which handling during production can be improved on comparatively large parts compared to injection-molded seals.List of reference characters1 Dual clutch device 2 First clutch element 3 Second clutch element 4 Pressure chamber 5 Pressure chamber 6 Centrifugal oil chamber 7 Centrifugal oil chamber 8 Pressure pot 9 Compression spring pack 10 Piston 11 Pressure pot 12 Compression spring pack 13 Piston 14 Rotor 15 Hollow shaft 16 Seal carrier 17 Sealing lip 18 Lip sealing ring 19 Sealing plate 20 Sealing lip 21 Arm of the seal carrier 22 Sealing element

Claims

Dual clutch device for a drive train of a motor vehicle with fully hydraulic actuation, comprising a first partial clutch (2) located radially on the outside and a second partial clutch (3) located radially inside the first partial clutch (2), wherein pressure chambers (4, 5) of the first and the second partial clutch (2, 3) and / or centrifugal oil chambers (6, 7) of the first and the second partial clutch (2, 3) are arranged radially inside the second partial clutch (3), and a pressure chamber (5) of the second partial clutch (3) and a centrifugal oil chamber (6) of the first partial clutch (2) are bounded by a common separating wall (16), characterized in that the separating wall is designed as a seal carrier (16), on which a sealing element (22) having two sealing lips (17, 20) is arranged, wherein the first sealing lip (17) seals off the pressure chamber (5) of the second partial coupling (3) and the second sealing lip (20) seals off the centrifugal oil chamber (6) of the first partial coupling (2).Dual clutch device according to Claim 1, characterized in that the seal carrier (16), together with a pressure pot (11) of the second clutch part (3) and a rotor (14), forms the second pressure space (5) of the second clutch part (3), the first sealing lip (17) of the sealing element (22) pressing against the pressure pot (11) of the second clutch part (3), while a sealing ring (18) is arranged opposite the rotor (14), which is pressed against the rotor (14) by the pressure pot (11) of the second clutch part (3).Dual clutch device according to Claim 1 or 2, characterized in that the seal carrier (16), together with a sealing plate (19), the rotor (14) and a pressure pot (8) of the first clutch element (2), forms the centrifugal oil chamber (6) of the first clutch element (2), the second sealing lip (20) of the seal element (22) pressing against a sealing plate (19) fastened to the pressure pot (8) of the first clutch element (2).Dual clutch device according to Claim 1, 2 or 3, characterized in that the sealing element (22) is connected by means of a material bond to one end of the seal carrier (16) by means of the two sealing lips (17, 20).Dual clutch device according to at least one of the preceding claims, characterized in that the sealing element (22) is formed with the sealing lips (17, 20) as a rubber composite part.Dual clutch device according to at least one of the preceding claims, characterized in that the seal carrier (16) is pressed with its end free from sealing lips onto the rotor (14).Dual clutch device according to at least one of Claims 3 to 6, characterized in that the seal carrier (16) has an axially extending arm (21) on an outer diameter, on which arm the sealing element (22) is positioned, the sealing plate (19) being mounted on the second sealing lip (20) such that it can be moved axially via the arm (21).Dual clutch device according to at least one of Claims 3 to 7, characterized in that the sealing plate (19) is connected to the pressure pot (8) of the first clutch element (2) in a materially integral manner.

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