Construction kit consisting of a hybrid module and a flywheel which is secured thereto and which comprises flywheel-side third through-holes, and powertrain which houses same

Abstract

The invention relates to a construction kit (1) consisting of a hybrid module (2), in particular a P2 hybrid module, and a flywheel (3) secured thereto for a (K1) starter clutch (4), said hybrid module (2) having: a damper input component (5), which is designed to be secured to a crankshaft (7) that can be moved by an internal combustion engine and which is connected / can be connected to a torsional vibration damper; and a (K0) separating clutch, which is arranged downstream of the torsional vibration damper 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 (9) designed to be secured to a rotor, wherein multiple first through-holes (8) are provided in the damper input component (5) in order to receive crankshaft screws (6), which are designed to secure the damper input component (5) to a component fixed to the crankshaft; multiple second through-holes (10) are provided in the output hub (9), said second through-holes (10) being arranged at a location which is offset to the first through-holes (8) in the axial direction and which allows access to the crankshaft screws (6); and the flywheel (3) has multiple third through-holes (14) which are arranged at an aligned position that is axially offset to the first through-holes (8) in order to allow the crankshaft screws (6), which are to be positioned in the first through-holes (8), to be reached through the flywheel (3). The invention also relates to a powertrain comprising such a construction kit.

Description

[0001] Kit consisting of a hybrid module and a flywheel attached to it with third through-holes on the flywheel side and the drive train accommodating the latter

[0002] The invention focuses on the interface of a P2 hybrid module toward the (K1) starting clutch / K1 starting clutch / (K1 friction) starting clutch / starting clutch / K1 clutch / K1 / K1 clutch. In particular, it is in the field of kits comprising hybrid modules, in particular in a P2 hybrid module arrangement, and a flywheel / flywheel disk attached thereto for a (K1) starting clutch. The hybrid module comprises: for attachment to a crankshaft movable by an internal combustion engine, a damper input component provided which can be connected to a torsional vibration damper, such as a screw / arc / spring damper / dual-mass flywheel, and with 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 direction of torque transmission from an internal combustion engine to a transmission,whose output part is connected to a (rotor carrier-like) output hub provided for attachment to a rotor (and the flywheel of a (K1) starting clutch), wherein a plurality of first through holes are provided in the damper input component for receiving crankshaft bolts, which are provided for securing the damper input component to a crankshaft-fixed component, wherein a plurality of second through holes are provided 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] Arrangements are already known in this technical field, for example from WO 2018 / 224 082 A1. This document discloses, for example, a central release mechanism (CSC) with a housing in which a piston is arranged so as to be longitudinally displaceable in the axial direction depending on hydraulic pressure in order to displace a release bearing and thereby open or close a clutch. At least one magnet is attached to the piston, which can be used to determine the position via a sensor, the sensor being connected to an electrical conductor. It is particularly emphasized there that the sensor is arranged radially inside the annular piston.

[0004] P2 hybrid modules are generally known. These are arrangements in a motor vehicle drivetrain in which an internal combustion engine and an electric motor serve as the drive element. The special feature of a P2 arrangement is that a separating clutch, commonly referred to as a (K0) separating clutch, is arranged between the internal combustion engine and the electric motor. This clutch 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 module's installation on the internal combustion engine should generally be similar to that of a clutch. Likewise, the transmission assembly should often be able to be used unchanged.

[0005] 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.

[0006] Typically, a spline is used between the flywheel of a (K1) starting clutch and the output hub. After the P2 hybrid module is installed, the (K1) starting clutch is connected to the output hub of the module / hybrid module via a spline. A snap ring is usually used for this purpose. The (K1) starting clutch is secured axially toward the transmission by this snap ring. Toward the internal combustion engine, the (K1) starting clutch is also usually supported on the output hub, with a pilot bearing providing additional radial support.

[0007] However, such solutions are difficult to install and virtually impossible to disassemble. With a solid flywheel, installing or removing the hybrid module from the crankshaft interface is only possible before installing it or after removing it from the output hub. Replacing the entire hybrid module, for example, in the event of damage, is then only possible after separating the interface between the flywheel of a (K1) starting clutch and the output hub.

[0008] It is therefore the object of the present invention to improve assembly, to enable or at least to improve disassembly.

[0009] In a generic kit, this is achieved according to the invention in that the flywheel has a plurality of third through holes arranged in a position axially offset from the first through holes and aligned with the flywheel to allow access to the crankshaft bolts positioned in the first through holes. Consequently, the third through holes allow access to the crankshaft bolts arranged in the first through holes.

[0010] This facilitates both assembly and disassembly. If the through holes of the output hub are aligned in the flywheel of the (K1) starting clutch, the hybrid module can be delivered with the flywheel installed and bolted to the internal combustion engine. This significantly simplifies assembly. The flywheel can also be installed in a more controlled manner. The hybrid module can now be disassembled because the crankshaft bolts are no longer covered by the (K1) starting clutch. Unlike in the prior art, the snap ring of the (K1) starting clutch can now be disassembled from the crankshaft side after disassembling the hybrid module, which was previously only accessible after disassembling the flywheel.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 through the through holes of the output hub and the flywheel. Ultimately, this involves designing the flywheel of the (K1) starting clutch on the P2 hybrid module in a so-called "off-axis arrangement."

[0011] The invention is thus comprised of three parts. Additional through holes in the flywheel of the K1 clutch, aligned with the crankshaft bolts, allow the hybrid module, including the assembled flywheel / (K1) starting clutch, to be bolted to the crankshaft and also removed.

[0012] The retaining ring in the gear area is either designed so that it can be pushed out of a groove through (possibly additional) retaining holes in the flywheel and the output hub, or the flywheel is removed by disassembling the module. The hybrid module is generally referred to as a "module" for short. The shape of the retaining ring may change the assembly sequence: the retaining ring is installed after the flywheel is installed. Only then is the module completed.

[0013] By positioning the retaining ring to the left of the pilot bearing, i.e., on the combustion engine side, the flywheel can be installed at the end of the module assembly. The retaining ring is installed afterward. However, it is also possible to remove the flywheel without disassembling the module. Axial forces acting toward the transmission are now no longer transmitted via the output hub, but rather via the pilot bearing into the crankshaft.

[0014] By providing, for example, two shoulders and an additional retaining ring in the area of ​​the pilot bearing, axial forces acting toward the engine can be transmitted to the crankshaft via the pilot bearing. To achieve this, axial clearance is maintained between the output hub and the flywheel. The screw connection to the crankshaft and the spline connection to the K1 clutch are advantageous. The invention significantly improves the interface between a P2 hybrid module and the (K1) starting clutch.

[0015] Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

[0016] It is advantageous if the flywheel is non-rotatably attached to the output hub via a spline and / or a screw connection. This allows high torques to be transmitted and the individual components to be precisely secured to one another. Noise emissions are significantly reduced, especially with the screw-type version without spline inserts.

[0017] To ensure that assembly can proceed smoothly, it is advantageous if several mounting holes are provided for the screw connection to accommodate flywheel screws, which serve to fix the output hub in rotation / attach it to a connecting component on the gearbox side designed as a flywheel, such as a (K1) starting clutch.

[0018] An advantageous embodiment is also characterized by the placement of a pilot bearing / bearing, such as a rolling bearing, such as a single-row ball bearing, between the flywheel and the damper input component. Axial misalignments and misalignments can thus be efficiently and cost-effectively corrected.

[0019] For long-lasting operation, it is beneficial if there is an axial clearance / axial distance between a free end of the output hub and a front surface of the flywheel / the flywheel.

[0020] It has proven effective to arrange the first through holes and second through holes in the same hole pattern. This allows easy access through the second through holes to the first through holes, allowing access to the crankshaft bolts during assembly and disassembly. If a retaining ring is attached to the spline on the flywheel on the side closest to the internal combustion engine, axial fixation can be achieved using simple means.

[0021] It has also proven to be effective to have a retaining ring on the flywheel on the side of the pilot bearing closest to the combustion engine.

[0022] If the damper input component has a recess to accommodate a retaining ring close to the pilot bearing, a system for the pilot bearing is created using simple means.

[0023] 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 a spline and a locking ring and / or flywheel screw to an output hub which represents a transmission-side output of the hybrid module.

[0024] The invention is explained in more detail below with the aid of a drawing. It shows:

[0025] Fig. 1 shows the kit comprising a hybrid module with a flywheel attached thereto for a (K1) starting clutch according to a first embodiment in a partially illustrated longitudinal section,

[0026] Fig. 2 shows a second embodiment of a kit according to the invention, comparable to the representation in Fig. 1 and

[0027] Fig. 3 shows a third embodiment of a kit according to the invention in a similar representation to Figs. 1 and 2. The figures are merely schematic and serve only to clarify the invention. The same elements are provided with the same reference numerals. Features of the individual embodiments may be interchanged.

[0028] Fig. 1 shows a first embodiment of a kit 1 according to the invention with a hybrid module 2 and a flywheel 3 attached thereto. The flywheel can be part of a (K1) starting clutch 4. The hybrid module 2 has a damper input component 5, which is attached to a crankshaft 7 via crankshaft bolts 6. The crankshaft bolts 6 are seated in first through-holes 8. The torque supplied by a crankshaft 7 driven by an internal combustion engine is transmitted from the damper input component 5 via a torsional vibration damper (not shown), for example comprising a plurality of energy storage devices, such as arc springs or straight springs, and a switching state-dependent passage through a (K0) separating clutch to an output hub 9. The output hub 9 has second through-holes 10.On a radially inner / innermost area of ​​the output hub 9, a spline 11 is provided, via which torque can be transmitted to a matching spline / counter spline 12 of the flywheel 3 during operation. The flywheel 3 also has a clip-on retaining ring 13. There are additional / third through holes 14 in the flywheel 3. They serve as access to the crankshaft bolts 6. The flywheel 3 is completed before the hybrid module 2 is mounted on the engine / combustion engine. Due to the improvement according to the invention, the hybrid module can in principle be disassembled from the internal combustion engine and can even be disassembled easily.

[0029] There is a pilot bearing 15 designed as a rolling bearing between the damper input component 5 and the flywheel 3. The axial direction is designated by reference numeral 16, and the radial direction by reference numeral 17. In Fig. 2, the damper input component 5 has a shoulder 18 on its radial inner side for the engagement of the pilot bearing 15. The retaining ring 13 is now arranged on the combustion engine side of the pilot bearing 15, in engagement with the latter.

[0030] In the embodiment according to Fig. 3, an additional retaining ring 13 is arranged, and the shoulder 18 is present on the other side compared to Fig. 2, to enable the transmission of axial forces. There is an axial play / axial gap between a transmission-side end 20 and an end face of the flywheel 3. The axial play / axial gap is referenced by reference numeral 19.

[0031] Additionally or alternatively, a screw connection can also be used.

[0032] List of reference symbols

[0033] kit

[0034] Hybrid module

[0035] flywheel

[0036] (K1-) Starting clutch

[0037] Damper input component

[0038] Crankshaft screw

[0039] Crankshaft first through hole

[0040] Output hub second through hole

[0041] Spline on output hub

[0042] Spline / counter spline on flywheel

[0043] Retaining ring third through hole

[0044] Pilot camp

[0045] axial direction

[0046] Radial direction

[0047] Paragraph

[0048] Axial play / axial gap / axial distance free end of the output hub

[0049] Front face of the flywheel

Claims

Patent claims 1. A kit (1) comprising a hybrid module (2), in particular a P2 hybrid module, and a flywheel (3) secured thereto for a (K1) starting clutch (4), wherein the hybrid module (2) comprises: a damper input component (5) provided for attachment to a crankshaft (7) movable by an internal combustion engine, which damper input component is connected to a torsional vibration damper and to a (K0) separating clutch arranged downstream of the torsional vibration damper in the torque direction from an internal combustion engine to a transmission, the output part of which is connected to an output hub (9) provided for attachment to a rotor, wherein the damper input component (5) has a plurality of first through-holes (8) for receiving crankshaft screws (6) provided for securing the damper input component (5) to a component fixed to the crankshaft, wherein a plurality of second through-holes (10) are provided in the output hub (9),wherein the second through-holes (10) are arranged at a position offset in the axial direction from the first through-holes (8) and allowing access to the crankshaft bolts (6), characterized in that the flywheel (3) has a plurality of third through-holes (14) which are arranged at an aligned position axially offset from the first through-holes (8) to enable access to the crankshaft bolts (6) to be positioned in the first through-holes (8) through the flywheel (3).

2. Kit (1) according to claim 1, characterized in that the flywheel (3) is fixed to the output hub (9) in a rotationally fixed manner via a spline (12, 11) and / or a screw connection.

3. Kit (1) according to claim 2, characterized in that a plurality of receiving holes are provided for the screw connection to receive flywheel screws, which serve to fix the output hub (9) in rotation / attach it to a connecting component on the transmission side designed as a flywheel (3).

4. Kit (1) according to one of claims 1 to 3, characterized in that a pilot bearing (15) is arranged between the flywheel (3) and the damper input component (5).

5. Kit (1) according to one of claims 1 to 4, characterized in that an axial distance (19) is present between a free end (20) of the output hub (9) and an end face (21) of the flywheel (3).

6. Kit (1) according to one of claims 1 to 5, characterized in that the first through holes (8) and the second through holes (10) are arranged in the same hole pattern / have the same hole pattern.

7. Kit (1) according to one of claims 1 to 6, characterized in that a retaining ring (13) on the flywheel (3) is connected to the side of a spline (11, 12) closer to the internal combustion engine.

8. Kit (1) according to one of claims 1 to 6, characterized in that a retaining ring (13) is connected to the flywheel (3) on the side of the pilot bearing (15) closer to the internal combustion engine.

9. Kit (1) according to claim 8, characterized in that the damper input component (5) has a shoulder (18) for receiving a retaining ring (13) close to the pilot bearing.

10. 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).

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