Hybrid module comprising receiving holes which allow the hybrid module to be secured to a flywheel, construction kit comprising a hybrid module and a flywheel which is secured via flywheel screws, and powertrain comprising said elements

Abstract

The invention relates to a hybrid module (1), in particular a P2 hybrid module, comprising a damper input component (3) which is designed to be secured to a crankshaft (2) that can be moved by an internal combustion engine and which is connected to a torsional vibration damper (4) and comprising a (K0) separating clutch (5) which is arranged downstream of the torsional vibration damper (4) in the torque running direction from an internal combustion engine to a transmission and the output part of which is connected to an output hub (6) designed to be secured to a rotor, wherein multiple first through-holes (7) are provided in the damper input component (3) in order to receive crankshaft screws (8) which are designed to secure the damper input component (3) to a component fixed to the crankshaft; multiple second through-holes (9) are provided in the output hub (6), said second through-holes (10) being arranged at a location which is offset to the first through-holes (7) in the axial direction (22) and which allows access to the crankshaft screws (8); and multiple receiving holes (10) are provided in the output hub (6) in order to receive flywheel screws (11) which are designed to rotationally fix the output hub (6) to a transmission input component. The invention also relates to a construction kit comprising such a hybrid module (1) and to a powertrain in which the aforementioned elements are contained.

Description

[0001] Hybrid module with mounting holes enabling a flywheel, kit with a hybrid module and flywheel mounted via flywheel screws and drive train with these elements

[0002] The invention relates to a hybrid module, in particular a P2 hybrid module, with a damper input component intended for attachment to a crankshaft movable by an internal combustion engine, which is connected to a torsional vibration damper, such as a coil / arc spring damper / a dual-mass flywheel, and to a (K0) separating clutch / KO separating clutch / (KO friction) separating clutch / separating clutch / separating clutch (KO) arranged downstream of the torsional vibration damper in the torque direction from an internal combustion engine / motor to a transmission, the output part of which is connected to a drive hub, for example in the form of a rotor carrier, intended for attachment to a rotor and in particular to a flywheel / flywheel of a (K1) starting clutch / K1 starting clutch / (K1 friction) starting clutch / starting clutch / K1 clutch / K1,wherein the damper input component has a plurality of first through holes for receiving crankshaft bolts provided for securing the damper input component in the output hub, wherein the second through holes are arranged at a location offset in the axial direction from the first through holes, allowing access to the crankshaft bolts.

[0003] WO 2018 / 224 082 A1 also relates to this field of invention. Therein, a central release bearing with a (CSC) housing is presented on a similarly constructed hybrid module, in which a piston is arranged so as to be longitudinally displaceable in the axial direction depending on the hydraulic pressure in order to displace a release bearing and in the process open or close a clutch, wherein at least one magnet is attached to the piston, which can be used to determine the position via a sensor, wherein the sensor is connected to an electrical conductor. It is particularly emphasized there that the sensor is arranged radially inside the annular piston. P2 hybrid modules are generally known. These are arrangements in a motor vehicle drive train in which an internal combustion engine and an electric motor are present as the drive element.The special thing about a P2 arrangement is that a separating clutch is arranged between the internal combustion engine and the electric motor. This clutch is commonly referred to as a (K0) separating clutch and is usually a friction clutch that can be designed either dry or wet. P2 hybrid modules often work with 48 V electric motors arranged parallel to the axis in combination with a manual transmission. This usually requires a closed unit including a torsional damper, the (K0) separating clutch and a gear drive for the electric motor. The module is partially filled with oil and therefore needs to be sealed. The interface on the crankshaft is often predetermined. The assembly of the module on the internal combustion engine should usually correspond to that of a clutch assembly. Likewise, the transmission assembly should often be able to be used unchanged.

[0004] Typically, the internal combustion engine is bolted to a crankshaft with a damper input of the P2 module. It is desirable for this interface to be located outside the wet space and to resemble the crankshaft interface of a dual-mass flywheel (DMF). To accommodate the crankshaft bolts, some prior art designs feature through holes in the output hub of the hybrid module that are aligned with the hole pattern of the crankshaft interface.

[0005] However, since a spline connection is usually also used between the flywheel of a (K1) start-up clutch and the output hub, a variety of disadvantages arise. After the hybrid module has been installed, the (K1) start-up clutch is connected to the output hub of the module / hybrid module via a spline connection. A snap ring has been used for this purpose. The (K1) start-up clutch is secured axially towards the transmission by this snap ring. Towards the internal combustion engine, the (K1) start-up clutch is usually also supported on the output hub, with a pilot bearing providing additional radial support. However, such solutions are difficult to install and virtually impossible to remove. Furthermore, the conventional spline connections, which are subject to play, cause noise problems.

[0006] It is therefore the object of the present invention to improve assembly, to enable or at least improve disassembly and to bring about a reduction in noise.

[0007] This is achieved according to the invention in a generic hybrid module in that a plurality of receiving holes are provided in the output hub for receiving flywheel screws, which are intended to fix the output hub in rotation / attach it to a transmission input component, such as the (K1) start-up clutch, in particular the first / a flywheel. It should be noted that the output hub can be designed not only in one piece, but also in several parts. A two-part design is recommended here. The two-part design is particularly advantageous when a radially inner part must meet different requirements in terms of material properties, heat treatment processes or strength compared to a radially outer part. Such a multi-part, adapted design is particularly advantageous when high strength values ​​are required, for example from strength class 10 onwards.The two or more parts can then be joined using positive, force, and / or material-locking methods, with riveting being particularly suitable. Form-locking methods are particularly advantageous for certain high-carbon steels.

[0008] Instead of the spline connection for transmitting the drive torque from the P2 hybrid module to the (K1) start-up clutch, the (K1) start-up clutch is now bolted to the output hub. This is done in principle analogous to a crankshaft screw connection with the damper input component in the crankshaft area. However, the flywheel-side screw connection is offset radially and circumferentially. The arrangement of the two screw connections is selected so that they do not overlap in the axial direction. They are therefore non-overlapping. This facilitates assembly and disassembly. If the through holes of the output hub are congruent in the flywheel of the (K1) start-up clutch, the hybrid module can be delivered with the flywheel bolted on and bolted to the internal combustion engine. This significantly simplifies assembly. The flywheel assembly can also be carried out in a more controlled manner.The fact that backlash-free connections of the (K1) start-up clutch are now possible prevents rattling noises (NVH). The (K1) start-up clutch can now be removed differently than in the prior art, as a snap ring, which was previously inaccessible, is no longer required. The hybrid module can now be removed because the crankshaft bolts are no longer covered by the (K1) start-up clutch. Backlash-affected splines or at least the associated noise problems, such as gear rattle, are eliminated. Therefore, considering the rotational position of the damper input component relative to the flywheel, there is at least one position in which the crankshaft bolts can be reached by passing through the through holes in the output hub. Ultimately, the core of the hybrid module is the interface, namely the one at the flywheel of the (K1) start-up clutch on the P2 hybrid module in a so-called "off-axis arrangement."

[0009] Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

[0010] It is advantageous if the mounting holes are designed as blind holes. This reduces the weakening of the component caused by the mounting holes compared to through holes.

[0011] The mounting holes can also be cleverly prepared for quick assembly. It is advantageous if the mounting holes are provided with internal thread sections. The flywheel bolts can then be inserted quickly and threaded bushings, which would otherwise be laborious to insert, can be avoided. An advantageous embodiment is characterized in that the mounting holes are arranged offset radially and / or circumferentially to the first through holes and / or to the second through holes. It is particularly advantageous if there is a radial and / or circumferential offset between the first and second through holes. It has proven effective if the first through holes and the second through holes are arranged in the same hole pattern, from which (however) the hole pattern in which the mounting holes are arranged differs. In this way, the installation space is used efficiently.

[0012] An advantageous embodiment is also characterized by the presence of a sliding seal between the output hub and the damper input component, which is used to seal a (K0) separating clutch containing the separating clutch. This allows the wet chamber containing the (K0) separating clutch to be efficiently separated from other components. This ensures the continuous, faultless functioning of the (K1) starting clutch, as contamination by hydraulic fluid is avoided.

[0013] If the receiving holes are arranged radially further outwards than the second through holes, the torque can also be transmitted to the (K1) starting clutch with a better effective radius, which has advantages in a lighter / weight-optimized design of the hybrid module.

[0014] Having the second through holes with a larger diameter than the first ones has a positive impact on ease of assembly. Access to the crankshaft bolts becomes easier.

[0015] The invention ultimately also relates to a kit with a hybrid module according to the invention, wherein a flywheel of the (K1) starting clutch, which is fixed to the output hub via the flywheel screws, is geometrically designed in such a way that the accessibility of the crankshaft screws in the drive train is ensured in the ready-to-operate state, for example / namely via third through holes arranged accordingly in the flywheel or via a radially inwardly recessed / limited dimensioning of the flywheel.

[0016] The invention also relates to a drive train for a motor vehicle, such as a passenger car or a commercial vehicle, for example a truck, with a hybrid module according to the invention in a P2 arrangement, comprising the (K0) separating clutch between the internal combustion engine and a rotor of an electric machine fixed to the rotor carrier, wherein the torsional vibration damper is connected on the one hand to a crankshaft via the crankshaft screws and on the other hand is connected via the (K0) separating clutch to the electric machine / E-machine and a (K1) starting clutch, which is connected via the flywheel screw to the output hub providing a transmission-side output of the hybrid module.

[0017] Preferably, a gear train for connecting the electric machine can be present / included and further preferably seals can be present for creating a wet space enclosing / enclosing the separating clutch.

[0018] Advantageous embodiments can be directed to the fact that a wet space sealing unit used for further wet space sealing and a rolling bearing are inserted between the output hub and a housing and / or on the other hand the rolling bearing is designed as a double-row ball bearing, for example in the manner of a pilot bearing.

[0019] Such a design is particularly suitable for light motor vehicles, especially for use in inner-city areas and regions with inadequate charging infrastructure.

[0020] The invention is explained in more detail below with the aid of a drawing. It shows:

[0021] Fig. 1 shows a longitudinal section, in detail, through a first embodiment of a hybrid module according to the invention, Fig. 2 shows an enlargement of the connection area of ​​the hybrid module from Fig. 1 to a crankshaft (not shown) and to a flywheel (not shown) of a (K1) starting clutch, and

[0022] Fig. 3 a frontal view along the longitudinal axis of the three hole patterns respectively containing first through holes, second through holes and receiving holes.

[0023] The figures are merely schematic and serve only to clarify the invention. The same elements are designated by the same reference numerals.

[0024] Fig. 1 shows a first embodiment of a hybrid module 1 according to the invention. It is arranged / configured in a P2 arrangement, namely as a P2 hybrid module. It has a damper input component 3 intended for attachment to a crankshaft 2 movable by an internal combustion engine. It has a torsional vibration damper 4. The torsional vibration damper 4 can be designed as a dual-mass flywheel with energy storage devices, such as coil / arc / linear springs. A (K0) separating clutch 5 is arranged downstream of the torsional vibration damper. When closed, the (K0) separating clutch 5 transmits the torque from an internal combustion engine (not shown) via the crankshaft 2, the damper input 3 and the torsional vibration damper 4 to the output hub 6, which in this embodiment is a single-piece.

[0025] The damper input component has a plurality of first through holes 7. These are provided for receiving crankshaft bolts 8. Second through holes 9 are provided in the output hub 6. These are intended as access for the crankshaft bolts 8. They are offset radially and circumferentially from the first through holes 7. However, there are also receiving holes 10, which in the present embodiment are designed as blind holes, but theoretically could also be conceivable as through holes. Flywheel bolts 11 are inserted into these receiving holes 10, which are used to screw the (K1) starting clutch 1 or a flywheel 12. The flywheel 12 then serves as the transmission input component. The flywheel 12 is part of a (K1) starting clutch 13 (not shown in detail).

[0026] There is also a section on the output hub 6 that is designed as a rotor carrier 14. This can also be a separate component in one variant. Furthermore, there is a release mechanism 15 for actuating the (K0) separating clutch 5.

[0027] A sliding seal 16 is used to seal a wet chamber 17. A wet chamber sealing unit 18 is also used for this purpose. Finally, a rolling bearing 19, designed as a double-row ball bearing, is located axially between them.

[0028] A housing of the hybrid module 1 is provided with the reference numeral 24.

[0029] For a better understanding of the axial direction and radial direction, the two directions are referenced with the reference numerals 22 and 23.

[0030] In Figs. 2 and 3, the connection area to the upstream and downstream parts of the damper input component 3 and the output hub 6 in the torque flow is shown enlarged. In the center of the damper input component there is a centering recess 20 for the torsional vibration damper 4 on the crankshaft 2. The first through-holes 7 define a first hole pattern, which, as a result of the radial positioning and viewed over the circumference, corresponds to the hole pattern of the second through-holes 9. However, the second through-holes 9 have a larger diameter than the first through-holes 7. Advantageously, they are 40, 55 or 67.8% larger. There is a centering shoulder 21 which is designed to be circumferential and is provided for centering the (K1) starting clutch 13.In addition, there is another hole pattern due to the receiving holes 10, which, however, is located radially further outward and circumferentially offset from the other two hole patterns. Fig. 3 shows a top view toward the internal combustion engine. The offset of the receiving holes 10 relative to the first through holes 7 and the second through holes 9 is clearly visible.

[0031] List of reference symbols

[0032] Hybrid module

[0033] Crankshaft

[0034] Damper input component

[0035] Torsional vibration damper

[0036] (K0-) Separating clutch

[0037] Output hub first through hole Crankshaft bolt second through hole

[0038] Mounting hole

[0039] flywheel screw

[0040] Flywheel / gearbox input component (K1-) starting clutch

[0041] rotor carrier

[0042] Release mechanism / CSC

[0043] Slip ring / slip seal

[0044] wet room

[0045] Wet room sealing unit

[0046] Rolling bearings

[0047] Hundredweight recess

[0048] Centering heel

[0049] axial direction

[0050] Radial direction

[0051] Housing

Claims

Patent claims 1. Hybrid module (1), in particular a P2 hybrid module, with a damper input component (3) provided for attachment to a crankshaft (2) movable by an internal combustion engine, which is connected to a torsional vibration damper (4) and with a (K0) separating clutch (5) arranged downstream of the torsional vibration damper (4) in the torque direction from an internal combustion engine to a transmission, the output part of which is connected to an output hub (6) provided for attachment to a rotor, wherein in the damper input component (3) there are a plurality of first through holes (7) for receiving crankshaft screws (8) which are provided for fixing the damper input component (3) to a component fixed to the crankshaft, wherein a plurality of second through holes (9) are provided in the output hub (6), wherein the second through holes (10) are provided at a location offset in the axial direction (22) from the first through holes (7),are arranged at a location allowing access to the crankshaft screws (8), characterized in that a plurality of receiving holes (10) are provided in the output hub (6) for receiving flywheel screws (11), which are provided for fixing the output hub (6) to a transmission input component (12) in rotation.

2. Hybrid module (1) according to claim 1, characterized in that the receiving holes (10) are designed as blind holes.

3. Hybrid module (1) according to claim 1 or 2, characterized in that the receiving holes (10) are provided with internal thread sections.

4. Hybrid module (1) according to one of claims 1 to 3, characterized in that the receiving holes (10) are arranged radially and / or circumferentially offset to the first through holes (7) and to the second through holes (9).

5. Hybrid module (1) according to one of claims 1 to 4, characterized in that the first through holes (7) and the second through holes (9) in are arranged in the same hole pattern, from which the hole pattern in which the receiving holes (10) are arranged differs.

6. Hybrid module (1) according to one of claims 1 to 5, characterized in that between the output hub (6) and the damping input component (3) there is a sliding seal (16) which is used to seal a (K0-) separating clutch 5 containing the separating clutch.

7. Kit with a hybrid module (1) according to one of the preceding claims, wherein a flywheel (12) of the (K1) starting clutch (13) fixed to the output hub (6) via the flywheel screws (11) is geometrically designed such that in the operational state in the drive train the accessibility of the crankshaft screws (8) is ensured.

8. Drive train for a motor vehicle, with a hybrid module (1) according to one of the preceding claims in a P2 arrangement, comprising the (K0-) separating clutch (5) between the internal combustion engine and a rotor of an electric machine fixed to the rotor carrier, wherein the torsional vibration damper (4) is connected on the one hand to a crankshaft (2) via the crankshaft screws (8) and on the other hand is connected via the (K0-) separating clutch (5) to the electric machine, and a (K1-) starting clutch (13) which is connected via the flywheel screws (11) to the output hub (6) providing a transmission-side output of the hybrid module (1).

9. Drive train according to claim 8, characterized in that a wet space sealing unit (18) and a rolling bearing (19) are inserted between the output hub (6) and a housing (24) for further wet space sealing.

10. Drive train according to claim 9, characterized in that the rolling bearing (19) is designed as a double-row ball bearing.

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