An assembly kit consisting of a flywheel and damper for transmitting torque from an internal combustion engine to a transmission system connected downstream.

Abstract

The present invention relates to an assembly kit (1) comprising a one-piece flywheel (2) that can be directly screw-fastened to the crankshaft of an internal combustion engine, and a torque limiter (3) for transmitting torque to a transmission of a vehicle powertrain connected downstream from the internal combustion engine, wherein the torque limiter (3) has two friction linings (4), a torque transmission plate (5) is fastened between the two friction linings, and one of the friction linings (4) is in contact with the flywheel (2). The present invention also relates to a vehicle powertrain comprising an internal combustion engine, a transmission, and the assembly kit (1) according to the present invention positioned between / connected therebetween.

Description

Technical Field

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[0004]

[0001] The present invention relates to an assembly kit comprising a flywheel and a torque limiter for transmitting torque to a transmission of a vehicle power train connected downstream of an internal combustion engine. The torque limiter has two friction linings, between which a torque transmission plate is clamped.

Background Art

[0002] A number of similar assembly kits are already known from the prior art, such as German Patent Application Publication No. 102004016960. German Patent Application Publication No. 102004016960 relates to a flywheel assembly. The subject matter therein relates to a flywheel damper to which torque is transmitted from the crankshaft of an internal combustion engine. The flywheel damper comprises a second flywheel assembly, a damping mechanism and a support plate. The damper mechanism connects the second flywheel assembly in a rotational direction to the crankshaft. The support plate is attached to the crankshaft and supports the second flywheel assembly of the crankshaft. The support plate has an axially extending portion that is axially detachable from the second flywheel assembly.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The object of the present invention is to eliminate or at least reduce the disadvantages known from the prior art.

Means for Solving the Problems

[0004] This problem is solved by the present invention with an assembly kit comprising an integrated flywheel that can be directly screw-fastened to the crankshaft of an internal combustion engine, and a torque limiter for transmitting torque from the internal combustion engine to the transmission of the vehicle powertrain connected downstream. The torque limiter has two friction linings, a torque transmission plate is tightened between the two friction linings, and one of the friction linings contacts the flywheel. Costs as well as space requirements are significantly reduced, and installation space is utilized more efficiently.

[0005] Therefore, the core of the present invention lies in proposing a flywheel integrating a torsional vibration damper and a torque limiter, in which case the flywheel forms the support for the lining of the torque limiter. The torsional vibration damper is optional and can be abbreviated as "damper" below. In particular, a friction lining, preferably a ring-shaped or segmented friction lining, or friction lining segment, is fixed to the flywheel so as not to rotate by corresponding embossed portions (Praegungen) that engage with one or more recesses of the friction lining or friction lining segment, for example. Naturally, segmentation of the torque transmission plate is also purposeful.

[0006] Here, a ring-shaped, segmented, or ring-shaped form is understood as a friction lining. Multiple segments can also form a single composite ring.

[0007] Advantageous embodiments are claimed in the dependent claims and are described in detail below.

[0008] In that case, it is advantageous if a friction lining located very close to the flywheel is attached to the flywheel or rubs against the flywheel during operation. This allows the two alternative functions to be used as needed for their respective applications. The lining should be understood to be firmly attached to the drive disk in certain cases and to rub against the flywheel or support disk.

[0009] Preferably, when a ring-shaped, segmented, or ring-shaped friction lining is attached to the flywheel via shape coupling, fail-safe torque transmission is ensured even during prolonged operation. Essentially, mounting methods using force coupling and / or material coupling can also be used additionally or alternatively.

[0010] It has been demonstrated that friction linings far from the flywheel are effective when they are attached to spacer elements such as spacer plates or spacer bolts, which are fixed to the flywheel, for example, via support plates.

[0011] Furthermore, it is advantageous if a damper / torsional vibration damper is connected downstream of the torque limiter in the torque transmission direction from the internal combustion engine to the transmission system.

[0012] If the damper uses multiple compression springs, such as linear coil springs, it offers good space efficiency. Basically, an arc spring damper is also conceivable, but in that case, a structure like a retainer would be necessary.

[0013] When end caps are present at at least one end, or preferably at both ends, of the compression spring, friction reduction and noise reduction effects can be obtained.

[0014] In such cases, it has been proven effective when the end cap is designed as a bowl, sleeve, or pot made of plastic or metal (e.g., steel). The bowl shape and properties of plastic are advantageous in the passenger car sector, while the properties of steel offer advantages in the commercial vehicle sector.

[0015] A special embodiment is also characterized by the damper being positioned radially inward of the torque limiter. This allows for particularly efficient use of installation space.

[0016] Basically, it's worth considering whether the damper is designed as a single-flange damper, double-flange damper, or triple-flange damper.

[0017] Furthermore, it is advantageous if the flywheel is made from a metal sheet. This is particularly advantageous in terms of manufacturing speed, material yield, and moment of inertia generation. The use of a cast iron flywheel is also conceivable.

[0018] It is advantageous if the flywheel has a double region on the radially outward side / folds radially outward in order to be able to place a particularly large mass on the radially outward side.

[0019] Furthermore, from a corrosion standpoint, it is advantageous if the torque limiter has a stainless steel torque transmission plate that is tightened between the friction linings.

[0020] Ultimately, the present invention also relates to a vehicle powertrain comprising an internal combustion engine, a transmission, and an assembly kit according to the present invention arranged / interposed between them.

[0021] Therefore, it is important that an outwardly folded metal plate flywheel is used. In this case, the torque limiter is positioned radially outward from the damper and riveted to the flywheel.

[0022] A conventional compression spring damper is positioned inside, which can also be equipped with a second friction device having a friction control disc. Its drive disc can extend directly between the linings of the torque limiter as a friction mating surface. In this case, riveting to a stainless steel plate is particularly advantageous for passing corrosion tests.

[0023] If possible, segments should be used as friction lining rather than closed rings to minimize material usage.

[0024] Preferably, the flange and the hub are made in one piece, i.e., integrally / from a single material, which means that the hub region is drawn out from the flange. It is also worth considering screwing the crankshaft into the holes in the flange / hub and the counter disk of the damper.

[0025] In that case, several methods of removal are conceivable. Rotate the damper in the torque limiter until the hole is positioned above the screw. For this purpose, the damper has an action geometry for a rotation tool. However, instead of riveting, the damper can also be removed from the torque limiter. The counter disk needs to have a relatively large inside so that it does not come out above the screw. If the inner diameters of the counter disk and the friction sleeve are too large and the screw hole is not covered, the flange in the damper can be rotated until the holes align. This is a third possibility to enable removal.

[0026] Basically, this assembly kit can be considered in any power train equipped with an internal combustion engine. However, the main focus is on hybrid systems.

[0027] The present invention will be described in detail below with reference to the drawings.

Brief Description of the Drawings

[0028] [Figure 1] It is a longitudinal sectional view along the rotation axis around which the flywheel of the assembly kit according to the first embodiment of the present invention rotates. [Figure 2] It is a view by a comparable illustration method of another embodiment of the assembly kit according to the present invention.

Modes for Carrying Out the Invention

[0029] The figures are of a merely schematic nature and are used only for the understanding of the present invention. The same reference signs are assigned to the same elements. The features of the individual embodiments can be interchanged or complement each other.

[0030] Figure 1 shows an assembly kit 1 according to the present invention, comprising an integrated flywheel 2 and a torque limiter 3. In particular, the flywheel 2 is designed as a single component and can or is screw-fastened directly to the crankshaft of an internal combustion engine, i.e., without other intervening components. However, in some cases, a cover disc 8 may be present even when directly screw-fastened, in order to prevent the screw heads from biting into the flywheel 2. Such a cover disc 8 has a very small mass compared to the flywheel 2, and since this mass is located on a small radius, usually the screw-fastening radius or the crankshaft coupling radius, the cover disc 8 can be ignored when determining the bounce mass (Schwungmasse) of the flywheel 2, and consequently for the function and integrity of the flywheel 2.

[0031] The torque limiter 3 has at least two preferably segmented friction linings 4. A torque transmission plate 5, preferably made of stainless steel, is tightened between these. At least one of the friction linings 4 is in direct contact with the first end face 6 of the flywheel 2. In this case, the flywheel screw 7 penetrates the cover disc 8 to the second end face 9 of the flywheel 2 and engages with a crankshaft (not shown) on which the mating threads of the screw 7 are provided.

[0032] The friction lining 4, located very close to the flywheel 2, is attached to the flywheel 2 via a shape coupling 10.

[0033] Another friction lining 4, located further from the flywheel, is attached to a spacer element 11, i.e., a spacer plate or spacer bolt, for example, via a support plate. In this case, a disc spring 14 can also be inserted between the support disc 12 and the metal plate / disc 13.

[0034] The torque transmission plate 6 located between the friction linings 4 can be designed as a disc or a ring, or it can be segmented itself.

[0035] In either case, rivets 15 act to connect the drive disc 16 to the torque transmission plate 5. Furthermore, a spacer plate 17 can be used to mount the counter disc 18.

[0036] In that case, multiple springs 20 are used in the arbitrary damper / torsional vibration damper 19. The springs 20 are typically compression springs, such as compression coil springs, especially linear compression coil springs. They dampen shocks, in which case the shock is transmitted to the flange 21 to which the hub 22 is attached. The flange 21 and the hub 22 can also be a two-part or multi-part structure. The use of disc springs 23 is just as suitable as the use of friction sleeves 24 and friction rings 25. In that case, the disc springs 23, friction sleeves 24 and friction rings 25 constitute a friction device.

[0037] In Figure 2, a similar structure is selected, but an additional mass ring 26 is attached to the flywheel 2. [Explanation of Symbols]

[0038] 1 Assembly Kit 2 Flywheel 3 Torque limiter 4. Friction lining 5 Torque transmission plate 6. First end face of the flywheel 7 Screws / Flywheel Screws 8 Cover Discs 9. Second end face of the flywheel 10 Shape combination 11 Spacer elements 12 Support disk 13 Metal plate / disc 14 Disc springs (ITL) 15 rivets 16 Drive disks 17 Spacer Plate 18 Counter disk 19. Damper / Torsion Vibration Damper 20 springs 21 Flange 22 Hubs 23 Disc springs 24 friction sleeves 25 friction rings 26 Mass Ring

Claims

1. An assembly kit (1) comprising an integrated flywheel (2) that can be directly screw-fastened to the crankshaft of an internal combustion engine, and a torque limiter (3) for transmitting torque to a transmission device of a vehicle powertrain connected downstream from the internal combustion engine, wherein the torque limiter (3) has two friction linings (4), and a torque transmission plate (5) is fastened between the two friction linings, characterized in that one of the friction linings (4) is in contact with the flywheel (2).

2. The assembly kit (1) according to claim 1, characterized in that a friction lining (4) located in close proximity to the flywheel is attached to the flywheel (2) or rubs against the flywheel (2) during operation.

3. The assembly kit (1) according to claim 2, characterized in that a ring-shaped, segment-shaped, or ring-shaped friction lining (4) is attached to the flywheel (2) via a shape coupling (10).

4. The assembly kit (1) according to any one of claims 1 to 3, characterized in that the friction lining (4) far from the flywheel is attached to a spacer element (11) fixed to the flywheel.

5. The assembly kit (1) according to any one of claims 1 to 4, characterized in that a damper (19) is connected downstream of the torque limiter (3) in the torque transmission direction from the internal combustion engine to the transmission device.

6. The assembly kit (1) according to claim 5, characterized in that the damper (19) uses a spring (20) of the type of compression spring, and / or the drive disk (16) itself functions as a friction mating object in the torque limiter (3).

7. The assembly kit (1) according to claim 6, characterized in that an end cap is provided at least one end of the spring.

8. The assembly kit (1) according to claim 7, characterized in that the end cap is designed as a bowl, sleeve, or pot made of plastic or metal.

9. The assembly kit (1) according to any one of claims 1 to 8, characterized in that the damper (19) is arranged radially inward of the torque limiter (3).

10. A vehicle powertrain comprising an internal combustion engine, a transmission, and an assembly kit (1) according to any one of claims 1 to 9, disposed between the internal combustion engine and the transmission.

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