Torsional vibration damping device and method for assembly and testing

Abstract

A torsional vibration damping arrangement comprising a primary element rotatable about an axis of rotation (A) and a secondary element rotatable relative to the primary element against an energy storage device, wherein the primary element radially includes an additional mass ring to increase the moment of inertia of the primary mass, characterized in that the mass ring provides recesses.

Description

[0001] The invention relates to a torsional vibration damping device and a method for assembling and testing a torsional vibration damping device.

[0002] Torsional vibration damping devices are primarily used in the powertrain of internal combustion engines to reduce rotational irregularities from the engine. An advantageous torsional vibration damping device comprises a primary element and a secondary element. The secondary element can rotate relative to the primary element against an energy storage device, usually a compression spring. The primary objective is to design the torsional vibration damping device in such a way that the torsional vibrations transmitted by the internal combustion engine are compensated as completely or almost completely as possible. The moment of inertia of both the primary and secondary elements is crucial for the effectiveness of the torsional vibration reduction.In addition, the primary element of the torsional vibration damping device is often used for mounting it to a drive unit. This involves gripping it with a gripping tool and mounting it, for example, to the crankshaft of an internal combustion engine. A rotational test is often also performed using the gripping tool, as is the case with a so-called end-of-line test.

[0003] A comparable torsional vibration damping arrangement is known from DE 10 2017 216 419. A disadvantage of this arrangement is that, depending on the required torsional vibration reduction, the moment of inertia of the primary element must be adjusted accordingly. This necessitates the provision of a completely new primary mass, which in turn also requires adjustments to the assembly and testing process for the gripping tool.

[0004] Based on the prior art described above, the object of the present invention is to provide a torsional vibration damping device that is cost-effective and easy to manufacture, can be flexibly adapted to the existing rotational irregularities, and wherein the primary element can also be used for mounting the torsional vibration damping device on a drive unit and / or for testing.

[0005] This problem is solved by the features of claim 1, namely by a torsional vibration damping arrangement comprising a primary element rotatable about an axis of rotation (A) and a secondary element rotatable relative to the primary element against an energy storage device, wherein the primary element radially comprises an additional mass ring to increase the moment of inertia of the primary mass, wherein the mass ring provides recesses.

[0006] Furthermore, the problem is solved by a method for assembling and / or testing a torsional vibration damping arrangement according to claims 1 to 10, wherein the method involves engaging a gripping tool in the recesses of the mass ring and assembling the torsional vibration damping arrangement onto a drive unit of a motor vehicle powertrain and / or performing a rotation test by introducing a torque from the gripping tool via the recesses of the mass element to the primary element.

[0007] The cutouts can be arranged distributed around the circumference.

[0008] Advantageously, the recesses can be evenly distributed around the circumference. Furthermore, it can be advantageous for the mass ring to have three recesses, each offset by 120° around the circumference.

[0009] For this purpose, the recesses can be provided radially on the outside or radially on the inside of the mass ring.

[0010] The recesses can also be provided on the side of the mass ring.

[0011] The recesses can extend over the entire axial extent of the mass ring, or they can extend partially over the axial extent of the mass ring.

[0012] Furthermore, it may be provided that the mass ring is designed in one piece or in multiple pieces.

[0013] The mass ring can be connected to the primary flywheel by frictional connection and / or by positive connection and / or by material connection.

[0014] The invention is described below by way of example by the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7 described in more detail.

[0015] The following show Fig. 1 a torsional vibration damping arrangement according to the invention in cross-section and side view; Fig. 2. Remove the mass ring from the torsional vibration damping arrangement. Fig. 1 in cross-section and side view; Fig. 3 another embodiment of a mass ring according to the invention in cross-section and side view; Fig. 4 a mass ring made of Fig. 3, but executed in multiple parts; Fig. 5 a further embodiment of a mass ring according to the invention in cross-section, side view and half side view; Fig. 6 another embodiment of a mass ring according to the invention in cross-section, side view and half side view; Fig. 7 another embodiment of a mass ring according to the invention in cross-section, side view and half side view;

[0016] The Fig. Figure 1 shows a torsional vibration damping arrangement 10 according to the invention, comprising a primary element 5 and a secondary element 8 rotatable relative to an energy storage device 4. A mass ring 6 is provided radially on the outside of the primary element 5. The mass ring 6 has a continuous cross-section radially on the inside and recesses radially on the outside. The continuous cross-section radially on the inside allows the mass ring 6 to be advantageously shrunk onto the primary element 5. The radially on the outside recesses 20 are distributed evenly around the circumference, namely 3 x 120°. A gripper (not shown) can engage in these recesses 20 to pick up the torsional vibration damping arrangement 10 and mount it, for example, on a drive unit. The recesses 20 can also be used to allow the gripper to transmit torque to the mass ring, for example, to perform a functional test.To obtain the largest possible moment of inertia of the primary element 5, which can be advantageous for torsional vibration damping, the mass ring 6 should provide mass as far radially outward as possible. A housing (not shown here) can form a radially outward restriction, which can surround the torsional vibration damping arrangement 10. A starter gear ring 12 is also provided axially offset from the mass ring 6.

[0017] The Fig. Figure 2 shows the mass ring from the torsional vibration damping arrangement. Fig. 1 in cross-section and in a side view. The mass ring 6 is made in one piece.

[0018] The Fig. Figure 3 shows a further embodiment of a mass ring 6 according to the invention in cross-section and a side view. The mass ring 6 comprises a radially outer cross-section extending over 360° and radially inner three recesses 20 with a distribution of 3 x 120°. This embodiment has, compared to the embodiment of the Fig. The advantage is that the continuous cross-section radially outward increases the moment of inertia; however, while not preventing elastic shrinkage to the primary element 5, it makes it more difficult. The mass ring 6 can be connected to the primary element 5 by a material-bonded connection such as welding, gluing, or soldering, or by additional elements such as screws or rivets.

[0019] The Fig. 4 shows a mass ring from the Fig. 3, however, in a multi-part embodiment. Here, a continuous ring 22 is provided radially on the outside. Radially on the inside, individual segments 23 are provided, so that the already in the Fig. The 3 described recesses result in 20.

[0020] The Fig. Figure 5 shows a further embodiment of a mass ring according to the invention in cross-section, side view and half-side view. Here, the recesses 20 are designed radially outwards as pockets 24, wherein the pockets 24 are not axially continuous.

[0021] The Fig. Figure 6 shows another embodiment of a mass ring according to the invention in cross-section, side view and half-side view. The recesses are similar to those in the Fig. 5 executed. In contrast to the execution in the Fig. 5 are the exceptions 20 in the Fig. 6 radially inside provided.

[0022] The Fig.Figure 7 shows another embodiment of a mass ring according to the invention in cross-section, side view, and half-side view. The recesses 20 are designed as end-face bores 25. Here, the bore is provided as a blind hole. While not shown here, the bore can also be provided as a through hole. The advantage of this embodiment is that both the inner and outer circumferences of the mass ring 6 are continuous. This can be advantageous both when shrinking the mass ring 6 onto the primary element 5 and also for the overall stability of the mass ring. Reference sign 4 Energy storage 5 Primary element 6 Mass ring 8 Secondary element 10 Torsional vibration damping arrangement 12 Starter sprocket 20 Exclusion 22 circumferential rings 23 segments 24 bags 25 holes A axis of rotation QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2017 216 419

[0003]

Claims

Torsional vibration damping arrangement (10) comprising a primary element (5) rotatable about an axis of rotation (A) and a secondary element (8) rotatable relative to the primary element (5) against an energy storage device (4), wherein the primary element (5) comprises an additional mass ring (6) radially outside to increase the moment of inertia of the primary mass (5), characterized in that the mass ring (6) provides recesses (20). Torsional vibration damping arrangement (10) according to claim 1, characterized in that the recesses (20) are arranged distributed over the circumference. Torsional vibration damping arrangement (10) according to claim 1 or 2, characterized in that the recesses (20) are arranged evenly distributed over the circumference. Torsional vibration damping arrangement (10) according to one of claims 1 to 3, characterized in that the mass ring (6) provides three recesses (20) which are offset by 120° around the circumference. Torsional vibration damping arrangement (10) according to one of claims 1 to 4, characterized in that the recesses (20) are provided radially outside or radially inside the mass ring (6). Torsional vibration damping arrangement (10) according to one of claims 1 to 4, characterized in that the recesses are provided laterally on the mass ring (6). Torsional vibration damping arrangement (10) according to one of claims 1 to 6, characterized in that the recesses (6) extend over the entire axial extent of the mass ring (6). Torsional vibration damping arrangement (10) according to one of claims 1 to 6, characterized in that the recesses (6) extend partially over the axial extent of the mass ring (6). Torsional vibration damping arrangement (10) according to one of claims 1 to 8, characterized in that the mass ring (6) is made in one piece or in multiple pieces. Torsional vibration damping arrangement (10) according to one of claims 1 to 9, characterized in that the mass ring (6) is connected to the primary flywheel (5) by frictional connection and / or by positive connection and / or by material connection. Method for assembling and / or testing a torsional vibration damping arrangement (10) according to claims 1 to 10, wherein the method comprises: - engaging a gripping tool in the recesses of the mass ring (6); - assembling the torsional vibration damping arrangement (10) onto a drive unit of a motor vehicle powertrain and / or performing a rotation test by introducing a torque from the gripping tool via the recesses (20) of the mass ring (6) to the primary element (5).

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