Hybrid drive arrangement

Abstract

Hybrid drive arrangement for a vehicle with an internal combustion engine for internal combustion engine driving and at least one electric machine (1) for electric driving as well as a dual-clutch transmission, wherein the electric machine (1) can be separated from the internal combustion engine via at least one separating clutch (3) designed as a wet-running, hydraulically actuated multi-plate clutch, wherein the outer plate carrier (4) of the separating clutch (3) and the outer plate carriers (5, 5A) of the two multi-plate clutches of the dual-clutch transmission are connected and mounted jointly on the transmission housing (6), characterized in that the outer plate carrier (4) of the separating clutch (3) and the outer plate carriers (5, 5A) of the dual clutch (2) of the dual-clutch transmission are connected to one another via at least one detachable connection (27).

Description

[0001] The present invention relates to a hybrid drive arrangement for a vehicle according to the type defined in more detail in the preamble of patent claim 1.

[0002] Hybrid drive systems for vehicles with an internal combustion engine for combustion engine operation and an electric motor for electric operation, as well as a transmission, are known from automotive engineering. Particularly in parallel hybrid systems, a separating clutch is required between the electric motor and the internal combustion engine to decouple the internal combustion engine during electric operation. The separating clutch can be designed as a dry or wet multi-plate clutch. In hybrid modules with dry-running electric motors, a wet multi-plate clutch is designed as a separate clutch in a closed module. This design as a separate module, with additional bearings and seals for the rotating parts, significantly increases the installation space required.In addition, a central pressure medium supply in the independent clutch module generates undesirable drag torques, which increases the power loss and also heats up the clutch.

[0003] Documents DE 10 2009 059 944 A1, DE 10 2009 030 135 A1, and DE 10 2009 038 344 A1 each disclose a hybrid drive arrangement for a vehicle with an internal combustion engine for internal combustion engine driving and at least one electric motor for electric driving, as well as a dual-clutch transmission. The electric motor can be separated from the internal combustion engine via at least one separating clutch configured as a wet-running, hydraulically actuated multi-plate clutch. The outer plate carrier of the separating clutch and the outer plate carriers of the two multi-plate clutches of the dual-clutch transmission are connected and mounted on the transmission housing.

[0004] The present invention is based on the object of proposing an alternative hybrid drive arrangement, in particular to develop it in such a way that the installation space requirement is as small as possible.

[0005] The object is achieved according to the invention by the features of patent claim 1, with further advantageous embodiments resulting from the subclaims and the drawings.

[0006] Thus, a hybrid drive arrangement for a vehicle with an internal combustion engine for internal combustion engine operation and at least one electric motor for electric operation, as well as with a dual-clutch transmission, is proposed. The electric motor or electric motor can be separated from the internal combustion engine via at least one separating clutch, preferably designed as a wet, hydraulically actuated multi-plate clutch. According to the invention, the outer plate carrier of the separating clutch and the outer plate carriers of the two multi-plate clutches of the dual-clutch transmission can be connected and jointly mounted on the transmission housing.

[0007] The inventive integrated design of the separating clutch and the dual clutch of the hybrid drive assembly achieves a short overall length and reduced weight by eliminating seals, bearing elements, and the associated connection points. Due to the structural design of the proposed hybrid drive assembly, the flow of cooling oil for the separating clutch is not impeded, thus reducing drag torque to at least a minimum. Furthermore, the function of the dual clutch is not affected by backflow of cooling oil from the separating clutch.

[0008] According to a first aspect of the invention, the outer disk carrier of the separating clutch and the outer disk carriers or the torus of the dual clutch are coupled via at least one detachable connection, wherein the detachable connection is preferably designed to be free of play. The detachable connection can be realized, for example, on a small diameter by a suitable shaft-hub connection or the like. For example, on a larger diameter, the detachable connection could be realized using a flange connection or the like. This allows the hybrid module of the hybrid drive arrangement according to the invention to be easily combined with existing dual clutches, essentially as an add-on solution.

[0009] In order to simplify the mounting of the electric motor in the proposed hybrid drive arrangement, a further development can provide for the outer disk carrier of the separating clutch to be connected to the rotor of the electric motor. In this way, the mounting of the outer disk carrier combination can also simultaneously serve as the mounting of the electric motor.

[0010] For indirect mounting of the inner disk carrier in the transmission housing, a further embodiment of the invention can provide for the inner disk carrier of the separating clutch to be mounted axially and / or radially, e.g., on both sides in the outer disk assembly. To achieve torque transmission to the dual-clutch transmission, the inner disk carriers of the dual-clutch transmission are each coupled to the input shaft of the associated sub-transmission of the dual-clutch transmission.

[0011] To ensure a sufficient pressure medium or oil supply for, for example, the separating clutch, the hybrid drive arrangement according to the invention can be provided with at least one bore or the like in one of the input shafts of the dual-clutch transmission for supplying the pressure and cooling oil for actuating and cooling the separating clutch. It is also conceivable that a different type of pressure medium supply is selected.

[0012] In order to distribute the pressure medium quantity accordingly for cooling and actuation, an adjustable orifice in the form of a flow limiting valve or the like can be provided. In this way, the available pressure medium flow is divided. One part is fed to the piston chamber to actuate the separating clutch and to the plate pack for lubrication and cooling purposes, while the other part is fed to the so-called centrifugal force compensation chamber. The lubricating and cooling oil flows through an annular gap or the like with a small diameter into the inner plate carrier of the separating clutch and, for example, through further bores to the plate pack. The pumping action of the plate pack can thus advantageously be used by the rotating clutch plates to pump the cooling oil radially outwards. The linings of the clutch plates can preferably have grooves or the like.For example, through holes or the like in the outer disk carrier, the lubricating cooling oil flows back into the transmission sump without being passed through the torus of the dual clutch.

[0013] If the coil assemblies of the electric machine are located, for example, in the oil chamber or wet chamber of the transmission housing, they can be exposed to sprayed-off oil or pressure fluid. To prevent this, according to the invention, a splash plate or the like, preferably with a labyrinth seal or the like, can be provided between the electric machine and the transmission oil sump in the transmission housing. If, for example, a wet-running electric machine is used as the electric machine, the splash plate can also be omitted, and the oil or pressure fluid spraying from the separating clutch can be used to cool the coil assemblies of the electric machine.

[0014] In the proposed integrated design of the separating clutch and the dual clutch, the oil or pressure medium of the separating clutch is advantageously routed around the torus of the dual clutch, so that the oil or pressure medium balance of the multi-plate clutches of the dual clutch transmission is not adversely affected.

[0015] For example, because the piston in a piston chamber for actuating the separating clutch and a baffle plate in a centrifugal force compensation chamber are connected to the rotor of the electric motor via the outer disk carrier of the separating clutch in the proposed hybrid drive arrangement, the piston and the baffle plate rotate at the speed of the electric motor. This ensures that the centrifugal force compensation always remains filled during electric driving and coasting modes, in which the separating clutch is open. This results in a short response time and positive controllability of the clutch closing process when the combustion engine is to be started. Thus, the combustion engine can be restarted without any time delay.

[0016] In the embodiment of the hybrid drive arrangement proposed according to the invention, only one radial shaft sealing ring is required for external sealing due to the integrated design of the hybrid module.

[0017] A further possible embodiment of the invention can provide for a bearing cover or the like in the transmission housing to be designed in such a way that it separates or divides the wet space, in which the combination of the separating clutch and the dual clutch is housed, from a dry space for the electric motor. This makes it possible to use a dry-running electric motor. The bearing cover can be designed as a single piece or in multiple pieces. Due to the division of the transmission housing by means of a bearing cover, an additional shaft seal may be required, which is preferably designed as a co-rotating seal. It is advantageous if the seal is designed to seal on the outside. In this case, the seal can be permanently mounted on the drive shaft connected to the crankshaft.When the vehicle is running on electric power, the sealing ring is positioned and dynamically seals in the bore of the shaft stub, which is connected to the outer disk carrier combination of the two clutches. However, it is also possible for the shaft sealing ring to be designed as an internally sealing shaft sealing ring.

[0018] According to a second aspect of the invention, the inner disk carrier of the separating clutch is supported by at least one radial bearing and several axial bearings.

[0019] Regardless of the respective design variants, the proposed hybrid drive arrangement can provide for the combustion engine to be coupled to the dual-clutch transmission via a suitable torsional damper for torsional vibration damping.

[0020] The present invention will be further explained below with reference to the drawings, in which various embodiments of the present invention are illustrated by way of example. In detail: Fig. 1 is a schematic view of an illustrative example of a hybrid drive arrangement with a one-piece clutch combination of a separating clutch and a dual clutch; Fig. 2 a schematic view of a first embodiment of the hybrid drive arrangement according to the invention with a multi-part clutch combination; Fig. 3 is a schematic view of an illustrative example of a hybrid drive arrangement with a bearing cover for separating a dry space for the electric machine; Fig. 4 a schematic view of a second embodiment of the hybrid drive arrangement according to the invention; Fig. 5 a schematic view of a third embodiment of the hybrid drive arrangement according to the invention with an alternative bearing design; and Fig. 6 a schematic view of an alternative embodiment according to Fig. 5.

[0021] The figures show various embodiments of a hybrid drive arrangement for a vehicle. Fig. 1 and Fig. 3 merely show illustrative examples (where previously "one embodiment" stood), which are not part of the invention as literally defined in the claims. Regardless of the respective embodiments, the hybrid drive arrangement comprises an internal combustion engine for internal combustion engine driving and at least one electric motor 1 for electric driving, as well as a dual-clutch transmission with a dual clutch 2. The electric motor 1 can be separated from the internal combustion engine via a separating clutch 3 designed as a wet-running, hydraulically actuated multi-plate clutch.

[0022] It is intended that the outer disk carrier 4 of the separating clutch 3 and the outer disk carriers 5, 5A of the dual clutch 2, which is designed as a multi-disk clutch, of the dual-clutch transmission are connected and mounted jointly on the transmission housing 6. In this way, an outer disk carrier combination of the separating clutch and the dual clutch is realized as a highly integrated system.

[0023] According to Fig. 1, the outer plate carrier combination is constructed as a single piece, comprising the outer plate carrier 4 of the separating clutch 3 and the two outer plate carriers 5, 5A of the dual clutch 2, and is mounted on both sides in the transmission housing 6. The rotor 7 of the electric motor 1 is attached to the outer plate carrier 4 of the separating clutch 3. As a result, the bearing 8, 8A of the outer plate carrier combination also serves simultaneously as the bearing for the electric motor 1. The inner plate carrier 9 of the separating clutch 3 is mounted axially and radially on both sides indirectly on the transmission housing 6 via bearing points 10, 10A via the bearing 8, 8A of the outer plate carrier combination. The inner plate carriers 11, 11A of the dual clutch 2 are coupled to the associated input shaft 12, 12A of the respective sub-transmission of the dual clutch transmission.

[0024] For the pressure medium or oil supply for cooling and actuating the separating clutch 3, a Fig. 5 and Fig. 6 schematically indicated bore 13 in the input shaft 12 of the dual-clutch transmission. The oil flow is divided into an actuating oil quantity and a cooling oil quantity by an adjustable orifice 14 in a shaft 15 of the inner disk carrier 9 of the separating clutch 3 with seals 22, 22A for the rotary feedthrough. The respective oil flows are then fed to the piston chamber 16 for actuating the piston 17 of the separating clutch 3 against the force of a return spring 20 and to a centrifugal force compensation chamber 18 in which a baffle plate 19 is provided. The piston chamber 16 is equipped with piston seals 23, 23A. Excess oil flows through a small-diameter annular gap 21 as cooling oil into the inner disk carrier 9 of the separating clutch 3 and through bores not shown to the disk pack of the separating clutch 3.The cooling oil is then pumped through the plate pack by the pumping action of the rotating clutch plates of the separating clutch 3 and is returned to the transmission oil sump through holes in the outer plate carrier 4 of the separating clutch 3, which are also not shown in detail.

[0025] To prevent the coils 24 of the electric motor 1, which are also located in the oil chamber or wet chamber 29 of the transmission housing 6, from being directly exposed to splashing oil, a splash plate 25 with a labyrinth seal is provided between the electric motor 1 and the transmission oil sump. The hybrid module is sealed externally by a radial shaft seal 26.

[0026] In Fig. 2 shows a first embodiment of the hybrid drive arrangement according to the invention, in which the outer disk carrier combination of separating clutch 3 and double clutch 2, in contrast to the example according to Fig. 1 is constructed in two parts. This means that the outer disk carrier 4 of the separating clutch 3 is connected to the outer disk carriers 5, 5A via a play-free, detachable connection 27. This allows the hybrid module to be easily combined with existing dual clutches as a modular solution.

[0027] In Fig. Figure 3 shows another example of a hybrid drive arrangement in which the wet chamber 29, in which the clutch combination is housed, is separated or partitioned off from a dry chamber 30 by a special design of the bearing cover 28. The electric motor 1 is arranged in the dry chamber 30, which in this special design can also be designed to be dry-running. For sealing, a co-rotating shaft seal 31 is provided, which is mounted in a rotationally fixed manner on the drive shaft 32, which is connected to the crankshaft of the internal combustion engine. The seal 31 is designed as an externally sealing shaft seal. During electric drive, it is stationary and dynamically seals in the bore of the shaft stub, which is connected to the outer disk carrier combination.

[0028] The Fig. The second embodiment of the hybrid drive arrangement according to the invention shown in Figure 4 differs from that shown in Fig. 3 in that the outer disk carrier 4 of the separating clutch 3 is connected to the outer disk carriers 5, 5A of the double clutch 2 via the detachable connection 27.

[0029] In Fig. Figure 5 shows a third embodiment of the hybrid drive assembly according to the invention, in which an alternative bearing design is shown, particularly for the aforementioned embodiments. Within the scope of the alternative bearing design, the inner disk carrier 9 of the separating clutch 3 is supported by a radial bearing 33 and two axial bearings 34, 34A.

[0030] The Fig. The alternative version shown in Figure 6 differs only in the Fig. 5 in that the bearing cover 28 is designed in several parts and is supported on the shaft 15 of the inner disk carrier 9 of the separating clutch 3 via an additional bearing point 35. Reference symbol 1 electric machine 2 dual clutch 3 Separating clutch 4 outer disc carrier of the separating clutch 5.5A outer disc carrier of the dual clutch 6 Gearbox housing 7 Rotor of the electric machine 8.8A Bearing of the outer disc carrier combination 9 Inner disc carrier of the separating clutch 10,10A Bearing points of the inner disc carrier 11,11A Inner disc carrier of the dual clutch 12,12A Input shafts of the sub-gearboxes 13 Hole for the pressure medium supply 14 adjustable aperture 15 Shaft of the inner disc carrier 16 Piston chamber 17 pistons 18 Centrifugal force compensation chamber 19 baffle plate 20 return spring 21 Annular gap 22.22A Seal for rotary union 23.23A piston seal 24 coils of the electric machine 25 Splash guard 26 Radial shaft seal 27 detachable connection 28 bearing caps 29 wet room 30 drying room 31 Shaft seal 32 drive shaft 33 radial bearings 34.34A thrust bearing 35 Bearing location for the bearing cover

Claims

[1] Hybrid drive arrangement for a vehicle with an internal combustion engine for internal combustion engine driving and at least one electric machine (1) for electric driving and a dual-clutch transmission, wherein the electric machine (1) can be separated from the internal combustion engine via at least one separating clutch (3) designed as a wet-running, hydraulically actuated multi-plate clutch, wherein the outer disk carrier (4) of the separating clutch (3) and the outer disk carriers (5, 5A) of the two multi-plate clutches of the dual-clutch transmission are connected and mounted together on the transmission housing (6), characterized by that the outer disk carrier (4) of the separating clutch (3) and the outer disk carriers (5, 5A) of the dual clutch (2) of the dual clutch transmission are connected to one another via at least one detachable connection (27). [2] Hybrid drive arrangement according to claim 1, characterized bythat the outer disk carrier (4) of the separating clutch (3) is connected to the rotor (7) of the electric machine (1). [3] Hybrid drive arrangement according to one of the preceding claims, characterized by that the housing-side bearing (8, 8A) of the outer disk carrier of the separating clutch (3) is provided as a bearing of the electric machine (1). [4] Hybrid drive arrangement according to one of the preceding claims, characterized by that the inner disk carrier (9) of the separating clutch (3) is mounted indirectly on the housing side at least via the bearing (8) of the outer disk carrier (4) of the separating clutch (3). [5] Hybrid drive arrangement according to one of the preceding claims, characterized by that the inner disk carriers (11, 11A) of the dual clutch (2) are coupled to the input shafts (12, 12A) of the respectively assigned partial transmission of the dual clutch transmission. [6] Hybrid drive arrangement according to one of the preceding claims, characterized bythat at least one bore (13) in the input shaft (12) of the first partial transmission of the dual-clutch transmission is provided as a pressure medium supply for actuating and cooling at least the separating clutch (3). [7] Hybrid drive arrangement according to claim 6, characterized by that in a shaft (15) of the inner disk carrier (9) of the separating clutch (3) there is provided an adjustable orifice (14) for dividing the pressure medium quantity from the bore (13) as a pressure medium supply for cooling and actuating the separating clutch (3). [8] Hybrid drive arrangement according to one of the preceding claims, characterized by that a splash plate (25) is provided in the gearbox housing (6) between the electric machine (1) and the gearbox sump. [9] Hybrid drive arrangement according to one of the preceding claims, characterized bythat a piston (17) for actuating the separating clutch (3) and a baffle plate (19) in a centrifugal force compensation chamber (18) are connected to the rotor (7) of the electric machine (1) via the outer disk carrier (4) of the separating clutch (3). [10] Hybrid drive arrangement according to one of the preceding claims, characterized by that the hybrid module is sealed with the electric machine (1) and the separating clutch (3) via at least one radial shaft sealing ring (26). [11] Hybrid drive arrangement according to one of the preceding claims, characterized by that a bearing cover (28) of the transmission housing (6) is designed such that the wet space (29) with the separating clutch (3) and the double clutch (2) of the double clutch transmission is separated from a dry space (30) for the electric machine (1). [12] Hybrid drive arrangement according to claim 11, characterized bythat the bearing cover (28) is supported via at least one bearing point (35) on the shaft (15) of the inner disk carrier (9) of the separating clutch (3). [13] Hybrid drive arrangement according to claim 11 or 12, characterized by that a co-rotating shaft sealing ring (31) is provided which is connected in a rotationally fixed manner to the drive shaft (32).

Images