Flywheel for a motor vehicle drive train

Abstract

The present invention relates to a flywheel (1) for a drive train of a motor vehicle, comprising a main flywheel mass (4) forming an input side (2) which can be screwed to a crankshaft of an internal combustion engine through a plurality of screw holes (5) distributed in the circumferential direction (U) of the flywheel (1), a slip clutch (6) arranged downstream of the main flywheel mass (4) in a torque transmission path emanating from the input side (2), and a torsional vibration damper (7) arranged downstream of the slip clutch (6) in the torque transmission path and which has both an output flange (11) and a hub (8) forming an output side (3), which is connected in a rotationally fixed manner to the output flange (11), with through holes (10) distributed in the circumferential direction (U), wherein the torsional vibration damper (7) has a disassembly device (12) which can be removed by rotation and which is designedto remove the non-rotatable connection of the hub (8) to the output flange (11) so that the through holes (10) can be aligned with the screw holes (5).

Description

[0001] The present invention relates to a flywheel with an integrated slip clutch and an integrated torsional vibration damper, wherein the main flywheel mass, which is in particular a single piece, can be screwed directly to the crankshaft of an internal combustion engine and preferably simultaneously forms one of the friction partners of the torque limiter.

[0002] Once the slip clutch has been triggered during operation of the vehicle, there is a possibility that the through-holes and screw holes for the crankshaft bolting in the hub of the torsional vibration damper will no longer be aligned, which would mean that in the event of damage - for example, if the flywheel has to be separated from the internal combustion engine in a workshop - the screws of the crankshaft bolting would no longer be accessible.

[0003] It is therefore an object of the present invention to provide a flywheel with an integrated slip clutch and an integrated torsional vibration damper that allows for easy disassembly.

[0004] According to the invention, this problem is solved by a flywheel for a drive train of a motor vehicle according to claim 1, comprising a main flywheel forming an input side, which can be screwed to a crankshaft of an internal combustion engine by means of several screw holes distributed in the circumferential direction of the flywheel, a slip clutch which is arranged downstream of the main flywheel in a torque transmission path emanating from the input side, and a torsional vibration damper which is arranged downstream of the slip clutch in the torque transmission path and which has both an output flange and a hub forming an output side, which is rotationally fixed to the output flange, with through-holes distributed in the circumferential direction.

[0005] Since the torsional vibration damper has a disassembly device that can be removed by twisting and is designed to release the rotationally fixed connection of the hub to the output flange, so that the through-holes can be aligned with the screw holes, the flywheel can be easily separated from the internal combustion engine, even after the slip clutch has engaged during operation of the vehicle.

[0006] Preferred embodiments of the present invention are set out in the dependent claims.

[0007] Preferably, the slip clutch includes at least two surfaces in frictional contact, one of which is formed on the main flywheel.

[0008] Furthermore, the main flywheel is preferably formed in one piece.

[0009] It is advantageous if the torsional vibration damper has a counter disk on the input side and the output flange and the hub which is fixed to the output flange on the output side, wherein the counter disk and the output flange are preloaded against each other by at least one spring device arranged between them.

[0010] Furthermore, it is advantageous if the torsional vibration damper also has a drive disc on the input side, which is rotationally fixed to the counter disc and is spaced away from the counter disc in the axial direction of the flywheel, with the output flange being arranged in the axial direction between the drive disc and the counter disc.

[0011] It is also advantageous if the torsional vibration damper has a hysteresis device and the disassembly device, which can be removed by twisting, is designed as part of the hysteresis device.

[0012] Preferably, the hysteresis device has a friction ring that can be removed by rotation and which, in the installed state, is arranged in an axial direction between a flange section of the hub in which the through-holes are arranged and the counter disk.

[0013] It is advantageous if, in the installed state, the friction ring holds the flange section of the hub in a rotationally fixed engagement with the output flange, and in the removed state allows the hub to be displaced in the axial direction in such a way that the rotationally fixed engagement of the flange section with the output flange can be released and the hub can be rotated relative to the output flange.

[0014] Furthermore, it is advantageous if the counter disk has recesses on its inner edge, while the friction ring has radial projections on its outer circumference. These projections, when installed, are arranged axially between the flange section and the counter disk and can be aligned with the recesses by rotating the friction ring, allowing it to be removed axially. Thus, the friction ring and the counter disk are essentially designed in a bayonet-like configuration.

[0015] Preferably, the friction ring, which can be removed by twisting, has breakable wedge sections or fold-out hinge sections that engage in recesses when the friction ring is installed, in order to hold the friction ring rotationally fixed to the counter disk. Thus, at least the ring section of the friction ring, or even the entire friction ring, can be removed without damage.

[0016] The invention described above is explained in detail below against the relevant technical background with reference to the accompanying figures, which show preferred embodiments. The invention is in no way limited by the purely schematic figures, it should be noted that the figures are not dimensionally accurate and are not suitable for defining size relationships. Features not expressly identified as essential to the invention are to be understood as optional. The figures show: Fig. 1 A first embodiment of a flywheel with slip clutch and torsional vibration damper in a half sectional view, Fig. 2 a component assembly comprising a hub and an output flange of the torsional vibration damper made of Fig. 1 in a half perspective view, Fig. 3 the torsional vibration damper with disassembly device from Fig. 1 in a half perspective view, Fig. 4 a friction ring of the disassembly device of the torsional vibration damper designed as a hysteresis device Fig. 1 in a perspective view, Fig. 5 a detailed view of the friction ring from Fig. 4 with wedge section, Fig. 6 a detailed view of the torsional vibration damper Fig. 1, in which the wedge sections of the friction ring have been broken out, Fig. 7 a detailed view of the torsional vibration damper Fig. 1 as a sectional view, in which one of the broken-out wedge sections is inserted into one of the blocking openings, Fig. 8 a detailed view of the torsional vibration damper Fig. 1, in which the friction ring has been twisted for removal, Fig. 9 a detailed view of the torsional vibration damper Fig. 1 after the friction ring has been removed, Fig. 10 a detailed view of the torsional vibration damper Fig. 1 after the hub has been displaced in the axial direction, Fig. 11 a detailed view of the torsional vibration damper from Fig. 1 in a top view, after the hub's through-holes have been aligned with the main flywheel's bolt holes, Fig. 12 a friction ring of the disassembly device designed as a hysteresis device according to a second embodiment for the torsional vibration damper made of Fig. 1 in a perspective view, Fig. 13 a detailed view of the friction ring from Fig. 12 with a hinge section in the assembled state, and Fig. 14 a detailed view of the friction ring from Fig. 12 with the hinge section in the folded-down disassembly state.

[0017] In the Fig. Figures 1 to 4 show a first embodiment of a flywheel rotatably mounted about a pivot axis D with an integrated slip clutch and integrated torsional vibration damper in an overall view ( Fig. 1) as well as in detailed views of individual assemblies and components ( Fig. 2 to 4) shown.

[0018] The flywheel 1 is intended for a motor vehicle drivetrain and has an input side 2 formed by a main flywheel mass 4. The main flywheel mass 4 is preferably a single piece formed from a sheet metal component, with an outer edge arranged radially R of the flywheel being preferably folded at least once. In the radial direction R inwards, the flywheel 1 can be connected to a crankshaft of an internal combustion engine by means of screws 26 via several screw holes 5 distributed around the circumference U of the flywheel 1.

[0019] The slip clutch 6 is arranged downstream of the main flywheel 4 in a torque transmission path originating from the input side 2. The slip clutch comprises at least two surfaces in frictional contact, which are pre-tensioned against each other in the axial direction A of the flywheel 1 by force or friction, such that the two surfaces rotate together without rotation below a set limit torque and rotate against each other above the limit torque until the applied torque has dropped below the limit torque again. One of the surfaces of the slip clutch 6 in frictional contact is preferably formed by or on the main flywheel 4.

[0020] The torsional vibration damper 7 is arranged downstream of the slip clutch 6 in the torque transmission path and has both an output flange 11 and a hub 8. The hub 8 is connected to the output flange 11 in a rotationally fixed manner, in particular by a positive locking 24, and forms an output side 3 of the flywheel 1. For rotationally fixed connection to a transmission input shaft or an intermediate shaft, the hub 8 has a splined connection 27 inside. Furthermore, the hub 8 has through-holes 10 distributed in the circumferential direction U to access the screw holes 5 in the main flywheel 4 and the screws 26 inserted therein. More precisely, the through-holes 10 are formed in a flange section 9 of the hub 8 that extends in the radial direction R.

[0021] Accessibility of the bolt holes 5 is not a problem when the flywheel 1 is new, as the flywheel 1 is manufactured so that the through-holes 10 in the hub 8 align with the corresponding bolt holes 5 in the main flywheel 4. However, once the slip clutch 6 has been engaged during operation of the vehicle, it is possible that the through-holes 10 and bolt holes 5 will no longer align, which would mean that in the event of damage – for example, if the flywheel 1 needs to be separated from the internal combustion engine in a workshop – the bolts 26 would no longer be accessible.

[0022] Therefore, the torsional vibration damper 7 has a disassembly device 12 that can be removed by twisting and is designed to release the rotationally fixed, i.e., in particular the positive locking connection of the hub 8 to the output flange 11 on the output side of the torsional vibration damper 7, so that the through-holes 10 can be aligned with the screw holes 5.

[0023] The torsional vibration damper 7 has a counter disk 13 on the input side and the output flange 11 and the hub 8, which is non-rotatably connected to the output flange 11, on the output side. The counter disk 13 and the output flange 11 are preloaded against each other in the circumferential direction U by at least one spring assembly 14 arranged between them. Furthermore, the torsional vibration damper 7 has a drive disk 15 on the input side, which is non-rotatably connected to the counter disk 13 and is spaced axially A from the counter disk 13, for example by spacer rivets or bolts. The output flange 11 is arranged axially A between the drive disk 15 and the counter disk 13. Preferably, the driven disc 15 forms one of the surfaces of the slip clutch 6 that are in frictional contact. For this purpose, it is possible, for example, that the driven disc 15 is made of stainless steel or is provided with friction lining inserts.

[0024] Furthermore, the illustrated torsional vibration damper 7 has a hysteresis device 16. The hysteresis device 16 comprises a friction ring 17 and a disc spring 18, which directly—or indirectly via one or more friction partners—acts the friction ring 17 in the axial direction. The friction ring 17 can be removed by rotation and, in the installed state, is arranged in the axial direction A between the flange section 9 of the hub 8, in which the through-holes 10 are arranged, and the counter disk 13. Thus, the friction ring 17 forms, in particular, the removal device 12, which can be removed by rotation; that is, the removal device 12, which can be removed by rotation, is specifically designed as part of the hysteresis device 16.

[0025] In the installed state, the friction ring 17 holds the flange section 9 of the hub 8 in a rotationally fixed engagement with the output flange 11 by holding the hub 8 fixed in axial direction A, whereby the output flange 11 and the flange section 9 of the hub 8 engage with each other by the positive locking 24. In the removed state – when the friction ring 17 has been removed by twisting and pulling it out in axial direction A – the hub 8 can be displaced in axial direction A such that the rotationally fixed engagement of the flange section 9 with the output flange 11, i.e., the positive locking 24, can be released and the hub 8 can be rotated relative to the output flange 11.

[0026] To prevent the friction ring 17 from rotating in its installed state, and to allow its removal, the counter disk 13 has recesses 19 distributed around its inner edge in the circumferential direction U. Accordingly, the friction ring 17 has radial projections 20 distributed around its outer circumference in the circumferential direction U. In its installed state, these projections are located axially A between the flange section 9 and the counter disk 13. By rotating the friction ring 17, these projections 20 can be aligned with the recesses 19 to allow its removal in the axial direction A. More precisely, the friction ring 17 comprises a ring section 21 from which the radial projections 20 extend in the radial direction R. The disassembly device 12 is thus designed as a bayonet fitting.

[0027] Furthermore, the friction ring 17 shows, as particularly from Fig. As can be seen in Figure 4, wedge sections 22 are located between adjacent radial projections 20. The wedge sections 22 project equally from the ring section 21 in the radial direction R. In contrast to the radial projections 20, the wedge sections 22 have predetermined breaking points towards the ring section 21, so that the wedge sections 22 can be easily broken out when the friction ring 17 is installed, and so that the ring section 21 with its radial projections 20 can otherwise be removed without damage.

[0028] The breakable wedge sections 22 engage in the recesses 19 on the inner edge of the counter disk 13 when the friction ring 17 is installed, thus holding the friction ring 17 rotationally fixed to the counter disk 13. Once the wedge sections 22 have been broken out, the remaining ring section 21 with its radial projections 20 can be rotated until the radial projections 20, which space the flange section 9 of the hub 8 and the counter disk 13 in axial direction A, are aligned with the recesses 19, so that the radial projections 20 can pass through the recesses 19 in axial direction A and the ring section 21 with the radial projections 20 can be removed.

[0029] With regard to the Fig. Sections 5 to 11 describe step-by-step the removal of the friction ring 17 and the twisting of the hub 8 of the torsional vibration damper 7.

[0030] In Fig. Figure 5 shows a detailed view of the initial state, in which the friction ring 17, in its installed state, is arranged in axial direction A between the flange section 9 of the hub 8 and the counter disk 13. The breakable wedge sections 22 engage in the recesses 19 on the inner edge of the counter disk 13 to hold the friction ring 17 rotationally fixed to the counter disk 13.

[0031] In Fig. Figure 6 shows the friction ring 17, more precisely the ring section 21 with its radial projections 20 still in the installed state, however the wedge sections 22 have been broken out.

[0032] With reference to Fig. 7 It should be mentioned that the counter disk 13, preferably arranged in the circumferential direction U between adjacent spring devices 14, may have locking openings 25 into which the broken-out wedge sections 22 can be inserted in order to clamp the output flange 11 to the counter disk 13 and to prevent displacement of the output flange 11 in the axial direction A once the remaining friction ring 17, more precisely the ring section 21 with its radial projections 20, has been removed.

[0033] In Fig. 8 The remaining bayonet-type friction ring 17 has been rotated until the radial projections 20, which space the flange section 9 of the hub 8 and the counter disk 13 in axial direction A, have been brought into contact with the recesses 19, so that the remaining friction ring 17 can be displaced in axial direction A, with the radial projections 20 passing through the recesses 19 in axial direction A, and the remaining friction ring 17, i.e. the ring section 21 with its radial projections 20, can be removed.

[0034] In Fig. 9 the remaining friction ring 17 has been completely removed.

[0035] This allows in Fig. 10 The hub 8 is displaced in axial direction A, thereby releasing the positive locking 24 between the flange section 9 of the hub 8 and the output flange 11. As a result, the hub 8 can be rotated in circumferential direction U relative to the counter disk 13 and the rest of the flywheel 1 until the through-holes 10 in the flange section 9 of the hub 8 are aligned with the screw holes 5 and the screws 26 are accessible through the through-holes 10.

[0036] This condition is in Fig. 11 shown, it should be noted that the hub 8 may need to be held separately if the wedge sections 22 have been removed beforehand and the characteristic curve of the disc spring 18 is not long enough to press the flange section 9 of the hub 8 in axial direction A against the counter disk 13 and hold it there.

[0037] With regard to the Fig. 12 to 14 a friction ring 17 of the disassembly device 12 designed as a hysteresis device 16 according to a second embodiment for the torsional vibration damper 1 is made of Fig. 1 explained.

[0038] Instead of or in addition to the wedge sections 22, the friction ring 17 has hinge sections 23. Like the wedge sections 22, the hinge sections 23 also project radially R from the ring section 21.

[0039] The hinge sections 23 engage in the recesses 19 on the inner edge of the counter disk 13 when the friction ring 17 is installed, in order to hold the friction ring 17 rotationally fixed to the counter disk 13. This state of a hinge section 23 is described in Fig. 13 shown.

[0040] The hinge sections 23 can also be folded out of the recesses 19 on the inner edge of the counter disk 13. This state of a hinge section 23 is described in Fig. 14 shown.

[0041] Subsequently, the entire bayonet-type friction ring 17 can be rotated relative to the counter disk 13 and the rest of the flywheel 1 and removed, whereupon the hub 8 can be rotated relative to the counter disk 13 and the rest of the flywheel 1, as shown with reference to the Fig. 8 to 11 have already been explained previously.

[0042] The preceding embodiments relate to a flywheel 1 for a drive train of a motor vehicle, comprising a main flywheel 4 forming an input side 2, which can be screwed to a crankshaft of an internal combustion engine by means of several screw holes 5 distributed in the circumferential direction U of the flywheel 1, a slip clutch 6 which is arranged downstream of the main flywheel 4 in a torque transmission path extending from the input side 2, and a torsional vibration damper 7 which is arranged downstream of the slip clutch 6 in the torque transmission path and which has both an output flange 11 and a hub 8 forming an output side 3, which is rotationally fixed to the output flange 11, with through-holes 10 distributed in the circumferential direction U, wherein the torsional vibration damper 7 has a disassembly device 12 which can be removed by rotation and which is designed toto release the rotationally fixed connection of the hub 8 to the output flange 11 so that the through-holes 10 can be aligned with the screw holes 5. In particular, the disassembly device 12 is designed in a bayonet-like manner. Reference symbol list 1 flywheel 2 Entrance page 3. Home page 4 Main flywheel 5 screw holes 6 Slip clutch 7 torsional vibration dampers 8 hub 9 Flange section 10 through-holes 11 Output flange 12 Dismantling device 13 Counter disk 14 Spring assembly 15 Drive plate 16 Hysteresis device 17 friction ring 18 Belleville washers 19 recess 20 radial lead 21 Ring section 22 Wedge section 23 Hinge section 24 Form closure 25 Blocking opening 26 screw 27 Wedge teeth A axial direction D axis of rotation R radial direction U circumferential direction

Claims

[1] Flywheel (1) for a drive train of a motor vehicle, comprising a main flywheel mass (4) forming an input side (2), which can be screwed to a crankshaft of an internal combustion engine by means of several screw holes (5) distributed in the circumferential direction (U) of the flywheel (1), a slip clutch (6) which is arranged downstream of the main flywheel mass (4) in a torque transmission path extending from the input side (2), and a torsional vibration damper (7) which is arranged downstream of the slip clutch (6) in the torque transmission path and which has both an output flange (11) and an output hub (8) forming an output side (3), which is non-rotatably connected to the output flange (11), with through-holes (10) distributed in the circumferential direction (U), wherein the torsional vibration damper (7) has a disassembly device (12) which can be removed by rotation and which is designed toto release the rotationally fixed connection of the hub (8) to the output flange (11) so that the through-holes (10) can be aligned with the screw holes (5). [2] Flywheel (1) according to claim 1, wherein the slip clutch (6) includes at least two surfaces in frictional contact, one of which is formed on the main flywheel (4). [3] Flywheel (1) according to claim 1 or 2, wherein the main flywheel mass (4) is formed in one piece. [4] Flywheel (1) according to one of claims 1 to 3, wherein the torsional vibration damper (7) has a counter disk (13) on the input side and the output flange (11) and the hub (8) which is fixed to the output flange (11) on the output side, wherein the counter disk (13) and the output flange (11) are preloaded against each other by at least one spring device (14) arranged between them. [5] Flywheel (1) according to claim 4, wherein the torsional vibration damper (7) further comprises on the input side a drive disk (15) which is rotationally fixed to the counter disk (13) and is spaced apart from the counter disk (13) in the axial direction (A) of the flywheel (1), wherein the output flange (11) is arranged in the axial direction (A) between the drive disk (15) and the counter disk (13). [6] Flywheel (1) according to one of claims 1 to 5, wherein the torsional vibration damper (7) has a hysteresis device (16) and the disassembly device (12) which can be removed by twisting is designed as part of the hysteresis device (16). [7] Flywheel (1) according to claim 4 or 5, each in conjunction with claim 6, wherein the hysteresis device (16) has a friction ring (17) that can be removed by rotation and which, in the installed state, is arranged in the axial direction (A) between a flange section (9) of the hub (8) in which the through-holes (10) are arranged and the counter disk (13). [8] Flywheel (1) according to claim 7, wherein the friction ring (17) in the installed state holds the flange section (9) of the hub (8) in rotationally fixed engagement with the output flange (11), and in the removed state allows a displacement of the hub (8) in axial direction (A) such that the rotationally fixed engagement of the flange section (9) with the output flange (11) can be released and the hub (8) can be rotated relative to the output flange (11). [9] Flywheel (1) according to claim 7 or 8, wherein the counter disk (13) has recesses (19) on its inner edge, wherein the friction ring (17) has radial projections (20) on its outer circumference which, in the installed state, are arranged in the axial direction (A) between the flange section (9) and the counter disk (13) and which can be brought into alignment with the recesses (19) by rotating the friction ring (17) in order to be able to remove the friction ring (17) in the axial direction (A). [10] Flywheel (1) according to claim 9, wherein the friction ring (17) which can be removed by twisting has breakable wedge sections (22) or foldable hinge sections (23) which engage in the recesses (19) in the installed state of the friction ring (17) to hold the friction ring (17) rotationally fixed to the counter disk (13).

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