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DE-102024117186-B4 - Torsional vibration damper

DE102024117186B4DE 102024117186 B4DE102024117186 B4DE 102024117186B4DE-102024117186-B4

Abstract

A torsional vibration damper comprising a primary mass (2) to be coupled to an input element, a secondary mass (6) to be coupled to an output element, and a spring damper arrangement (10) coupled to the disk-shaped primary mass (2) and the secondary mass (6), comprising several arc springs (11) against which the primary mass (2) and the secondary mass (6) are rotatable relative to each other, wherein the secondary mass (6) has an annular spring channel (9) in which the arc springs (11) are received, and wherein at least one elastic vibration damper device (22, 26) is provided on the primary mass (2). The arrangement is characterized in that the secondary mass (6) has a disk-shaped flange section (7) which transitions into the spring channel (9) at its outer circumference and to which a hub flange (17), via which the connection to the output element is made, is attached.

Inventors

  • Roman Weisenborn
  • Rainer Hannappel
  • Jürgen Maier
  • Richard Unterreiner
  • Pascal Strasser

Assignees

  • Schaeffler Technologies AG & Co. KG

Dates

Publication Date
20260513
Application Date
20240619

Claims (8)

  1. Torsional vibration damper comprising a primary mass (2) to be coupled to an input element, a secondary mass (6) to be coupled to an output element and a spring damper coupled to the disk-shaped primary mass (2) and the secondary mass (6). The arrangement (10) comprises several arc springs (11) against which the primary mass (2) and the secondary mass (6) are rotatable relative to each other, wherein the secondary mass (6) has an annular spring channel (9) in which the arc springs (11) are received, and wherein at least one elastic vibration damping device (22, 26) is provided on the primary mass (2). It is characterized in that the secondary mass (6) has a disk-shaped flange section (7) which transitions into the spring channel (9) at its outer circumference and to which a hub flange (17), via which the connection to the output element is made, is attached.
  2. Torsional vibration damper according to Claim 1 , characterized in that an additional damping mass (23) is arranged on the primary mass (2) via an elastic connecting element (24).
  3. Torsional vibration damper according to Claim 2 , characterized in that the damping mass is a mass ring (23) which is attached via the connecting element (24) to an axial disk surface (25) of the primary mass (2).
  4. Torsional vibration damper according to Claim 2 , characterized in that the damping mass is a mass ring (23) which is attached via the connecting element (24) to a radial outer circumferential surface of the primary mass (2).
  5. Torsional vibration damper according to Claim 4 characterized in that several axially bent, radially extending drivers (17) are provided on the primary mass (2), via which the primary mass (2) is coupled to the spring damper arrangement (10).
  6. Torsional vibration damper according to one of the Claims 3 until 5 , characterized in that the mass ring (23) is a sensor ring.
  7. Torsional vibration damper according to one of the preceding claims, characterized in that the primary mass (2) has a disk-shaped flange section (3) on which several openings (28) separated in the circumferential direction by spokes (29) are provided to form a spoke damper (27).
  8. Torsional vibration damper according to Claim 1 , characterized in that the secondary mass (6) is centered via the flange section (7) on a centering section provided on the primary mass (2).

Description

The invention relates to a torsional vibration damper comprising a disk-shaped primary mass to be coupled to an input element, a secondary mass to be coupled to an output element, and a spring damper arrangement coupled to the primary mass and the secondary mass, comprising several arc springs against which the primary mass and the secondary mass are rotatable relative to each other, wherein the secondary mass has an annular spring channel in which the arc springs are received. A torsional vibration damper, sometimes also called a dual-mass flywheel or torsional vibration damper, is primarily used as a vibration damper for torsional vibrations in the drivetrains of motor vehicles. The torsional vibration damper is typically positioned between the crankshaft of an internal combustion engine powering the vehicle and a clutch located upstream of the transmission. It has a primary mass, which forms the input part of the torsional vibration damper and is coupled to an input element, such as the crankshaft. A secondary mass is also provided, which forms the output part of the torsional vibration damper and is coupled to an output element, such as a transmission input shaft. The primary and secondary masses are coupled to each other and to each other in a known manner via a spring damper assembly, which comprises several arc springs that serve as energy storage devices against which the rotation of the two masses occurs. This makes it possible to dampen torsional or torsional vibrations that occur during the operation of the internal combustion engine, so that these are not transmitted to the output element, or only in a damped form. These torsional or torsional vibrations result from the uneven torque or drive torque of the internal combustion engine, which is usually a piston engine. They are inherent to the design and operation of the engine and are transmitted via the input element, i.e., the crankshaft, to the primary mass coupled to it. The vibrations are transmitted from the primary mass to the spring damper assembly, or rather the arc springs, which dampen the vibrations and transmit them to the secondary mass only in a damped form. The basic function of such a torsional vibration damper is known. Such a torsional vibration damper, designed as a pulley, operates as follows: 1 the DE 41 03 213 A1 The pulley is mounted on the crankshaft of an internal combustion engine in a rotationally fixed manner and is divided into two mass parts. A torsionally elastic damper formed by springs is arranged between these two mass parts. One mass part is located on the primary side of the torsional vibration damper and consists of a hub that is rotationally fixed on the crankshaft, two housing parts that define an annular spring chamber for the springs, and a vibration damping device. The other mass part, located on the output side (secondary side), consists of a flange and a belt race of the pulley that is rigidly connected to the flange. Besides the usual design of such a torsional vibration damper, as for example in DE 10 2016 223 413 A1 In addition to the described design in which the primary mass has an annular spring channel in which the arc springs are housed, while the secondary mass is designed as a simple disc-shaped flange that engages between the arc springs, a design known as a "reversed damper" is also known, in which the primary mass is designed as a simple disc-shaped flange, while the secondary mass has the annular spring channel in which the arc springs are housed. An example of such a torsional vibration damper can be found in DE 10 2017 127 525 A1 Accordingly, the housing enclosing the arc springs with the annular channel is not connected to the crankshaft, as was previously customary, but to the transmission input shaft. The flange disk interacting with the arc springs, i.e., the primary mass, is attached to the crankshaft. This allows for a functionally improved torque transmission device to be implemented with simple and cost-effective means, characterized by a vibration damper that is optimized for installation space, at least in the axial direction. Another example of a torsional vibration damper designed as a "reversed damper" and formed as a pulley comes from the DE 42 25 314 B4 A torsional vibration damper is revealed, the secondary mass (6) of which has the housing with an annular spring channel with the arc springs and the primary mass of which is provided with an elastic vibration damping device. Such torsional vibration dampers are characterized by an integrated vibration damping device, i.e., a torsional vibration damper, which is provided directly on the primary mass and is therefore part of it. The installation of a separate torsional vibration damper on the crankshaft is therefore unnecessary, since this functionality is additionally provided by the torsional vibration damper according to the invention or by the primary mass. The torsional vibration damper according to the invention is th