Torsional vibration damper with spoke springs and fluid supply means

Abstract

The invention relates to a torsional vibration damper (10) for reducing torsional vibrations in a drive train of a vehicle, having an inner component (14), which can be rotated about an axis of rotation (12), for connecting to a rotatable connection component of the drive train, said connection component having rotary oscillations, a plurality of spoke springs (16) which are spaced apart from one another circumferentially, an outer component (30) which is connected to the inner component (14) via the spoke springs (16) so as to rotate therewith and which can be rotated to a limited extent against a spring force of the spoke springs (16) with respect to the inner component (14), a friction device (36) having at least one friction region (48, 54) which acts between the inner component (14) and the outer component (30) during a relative rotational movement and is formed between a friction element (38) and a counter friction element (42), wherein the friction element (38) is designed as a component which is separate from the spoke springs (16) and has fluid supply means (80) for supplying the friction region (48, 54) with a cooling fluid.

Description

[0001] Torsional vibration damper with spoke springs and fluid supply system

[0002] Description introduction

[0003] The invention relates to a torsional vibration damper according to the preamble of claim 1. DE 102019 101 983 A1 describes a spoke spring damper for reducing torsional vibrations, which has a mounting disc rotatable about an axis of rotation and elastically bendable spokes projecting radially from the mounting disc, and a mass ring connected to the spokes and generating a restoring torque. Mass segments are arranged on the spokes, which bear against a housing as a friction partner with a spring force.

[0004] The object of the present invention is to make the torsional vibration damper more reliable and cost-effective. Torsional vibrations should be reduced more efficiently and to a greater extent.

[0005] At least one of these tasks is solved by a torsional vibration damper with the features according to claim 1. This allows the torsional vibration damper to reduce torsional vibrations more reliably and efficiently, while also exhibiting improved durability. The torsional vibration damper can be manufactured more cost-effectively.

[0006] The vehicle can be a motor vehicle, a truck, or a two-wheeled vehicle.

[0007] The torsional vibration damper can be arranged between a drive element, in particular an internal combustion engine, and a driven element, in particular a transmission. The drive element can provide drive power for propelling the vehicle. The torsional vibration damper can be arranged on the crankshaft of an internal combustion engine.

[0008] The torsional vibration damper can transmit at least part of the torque from the drive element towards the output element. The torsional vibration damper can be arranged in series in the torque transmission path between the drive element and the output element. In this case, the spoke springs can transmit the torque between the drive element and the output element. The torsional vibration damper can also be a torsional vibration damper. The torsional vibration damper can be connected in parallel to a torque transmission path between the drive element and the output element, for example, arranged on one side of the crankshaft from which the drive power of the internal combustion engine is directed towards an output element, particularly for propelling the vehicle, or arranged on the opposite side of the crankshaft.

[0009] The powertrain can be a hybrid powertrain which, in addition to the drive element, for example the combustion engine, has at least one other drive element, in particular an electric motor.

[0010] The connecting component can be an engine component of the internal combustion engine. The connecting component can be a crankshaft, a camshaft, or a component associated with one.

[0011] The internal component can be an input hub. The internal component can be connected to the crankshaft or camshaft. The internal component can be rotatable concentrically to the crankshaft or camshaft. The internal component can be connected to the connecting component by positive locking, force locking, and / or friction locking.

[0012] The outer component can be manufactured as a single piece with at least some of the spoke springs. The outer component can have a mass ring. The outer component can have a greater moment of inertia than the inner component.

[0013] Some or all of the spoke springs can be manufactured as a single piece. The spoke springs manufactured as a single piece can form a spoke spring disc, which has an outer ring and / or inner ring through which the spoke springs of the spoke spring disc are connected to each other. The torsional vibration damper can comprise several spoke spring discs arranged axially side by side. The spoke spring can have a greater radial extension than its axial and / or circumferential extension. The spoke spring disc can be a stamped component. The spoke springs can be attached to the inner component, in particular via the inner ring, and / or to the outer component, in particular via the outer ring.

[0014] The friction device can generate friction during a relative rotational movement between the inner and outer components. This can dampen resonance vibrations between the inner and outer components. The friction element can be rotatable about the axis of rotation. The friction element can be a sheet metal component. The friction element can be a stamped component. The friction element can bear against the counter-friction element, particularly a counter-contact surface, with a contact surface, especially radially outward, to form the friction zone.

[0015] The torsional vibration damper can have at least two friction elements axially offset from each other. The spoke springs can be arranged axially between the two friction elements. The two friction elements can be identical in design and arranged in mirror images of each other.

[0016] The friction area can be a contact area between the materials steel and steel, paper and steel, or plastic and steel.

[0017] The friction area can be located in a radially outer half of the torsional vibration damper.

[0018] The cooling fluid can cool the friction area, the friction element, and / or the counter-friction element by dissipating heat. The cooling fluid can be gaseous and / or liquid. It can be supplied as a splash spray or as a continuous fluid flow. The cooling fluid can be water or oil. It can be engine oil from an internal combustion engine or an oil-air mixture, particularly one consisting of air and engine oil.

[0019] In a preferred embodiment of the invention, it is advantageous if the friction element is rotationally fixed to the inner component. The friction element can be designed as a separate component from the inner component. The friction element can be formed integrally with the inner component. The inner component can be connected to the friction element by positive locking, force locking, and / or material locking.

[0020] The counter-friction element can be rotationally fixed relative to the outer component. The counter-friction element can be designed as a separate component from the outer component. The counter-friction element can be integrally formed with the outer component. The outer component can be connected to the counter-friction element by positive, force, and / or material connection.

[0021] In a preferred embodiment of the invention, the friction element is arranged axially adjacent to the spoke springs and / or radially overlapping the main part of the spoke springs. The friction element can be axially spaced from the spoke springs. The friction element and the spoke springs can predominantly overlap radially. In a preferred embodiment of the invention, the fluid supply means are arranged radially overlapping the spoke springs. The fluid supply means can be arranged axially offset from the spoke springs. The fluid supply means can be arranged radially between the inner component and the outer component.

[0022] In a specific embodiment of the invention, it is advantageous if the friction zone is pre-tensioned with an axial force. The frictional performance of the friction zone can also depend on the axial force.

[0023] In a preferred embodiment of the invention, the friction element acts as a spring element to generate the axial force. This allows the torsional vibration damper to be designed in a space-saving manner.

[0024] In a preferred embodiment of the invention, it is advantageous if the friction element is designed as a disc spring diaphragm. The disc spring diaphragm can be a steel component.

[0025] In a preferred embodiment of the invention, it is advantageous if the fluid supply means comprise at least one through-opening in the friction element for the axial flow of the cooling fluid between a first axial side and an axially opposite second axial side of the friction element. The through-opening can reduce the axial force on the friction area compared to an identical friction element design without the through-opening. Assuming the same axial force on the friction area, this allows the friction element to have a greater material thickness than a friction element without a through-opening. This, in turn, increases the mass and thus the heat capacity of the friction element.

[0026] The friction element can have multiple through-openings. The through-openings can be arranged circumferentially and / or radially offset from each other.

[0027] In a preferred embodiment of the invention, the friction element delineates an interior space containing the spoke springs, and the through-opening establishes a fluid connection for supplying the interior space with the cooling fluid from the outside. The interior space can be shielded from the environment, in particular sealed, except for the through-opening.

[0028] In a specific embodiment of the invention, it is advantageous if the fluid supply means, acting as fluid flow conveying means, actively support a fluid flow supplying the friction area with cooling fluid during a rotational movement of the friction element around its axis of rotation. The fluid flow conveying means can be designed in a scoop-like form. The fluid flow conveying means can create a pressure differential between the first and second axial sides of the friction element.

[0029] Further advantages and advantageous embodiments of the invention will become apparent from the description of the figures and the illustrations.

[0030] Character description

[0031] The invention is described in detail below with reference to the illustrations. These show, in detail:

[0032] Figure 1: A half section of a torsional vibration damper in a special embodiment of the invention.

[0033] Figure 2: A side view of a spoke spring disc of the torsional vibration damper from Figure 1.

[0034] Figure 3: A section of a side view of a friction element of a torsional vibration damper in a further special embodiment of the invention.

[0035] Figure 1 shows a half-section of a torsional vibration damper in a specific embodiment of the invention. The torsional vibration damper 10 is arranged to reduce torsional vibrations in a vehicle's drivetrain and comprises an inner component 14 rotatable about a pivot axis 12 for connection to a rotatable connecting component of the drivetrain that exhibits torsional vibrations. The connecting component can be a component of an internal combustion engine, for example, a crankshaft or camshaft.

[0036] Furthermore, the torsional vibration damper 10 comprises several spoke springs 16 spaced apart circumferentially. Some of the spoke springs 16 are integrally formed to create a spoke spring disc 18, as shown in a side view in Figure 2, which has an outer ring 20 and an inner ring 22. The spoke springs 16 of the spoke spring disc 18 are connected to each other via the inner ring 22 and outer ring 20. The spoke springs 16 each have a greater extension in the radial direction 24 than in the axial direction 26 and in the circumferential direction 28. Returning to Figure 1, the torsional vibration damper 10 comprises several spoke spring discs 18 arranged axially side by side. The spoke spring discs 18 are preferably each manufactured as a stamped component.

[0037] Furthermore, the torsional vibration damper 10 comprises an outer component 30 which is connected to the inner component 14 via the spoke springs 16 so as to rotate with it and which is rotatable against the inner component 14 against a spring force of the spoke springs 16, but only to a limited extent. The outer component 30 comprises a first disc component 32 and a second disc component 34 axially offset therefrom. The spoke spring washers 18 are axially mounted between the first and second disc components 32, 34 with their respective outer rings 20.

[0038] Furthermore, the torsional vibration damper 10 comprises a friction device 36 with a first friction zone 48, effective during relative rotational movement between the inner component 14 and the outer component 30, formed between a friction element 38 (here a first friction element 40) and a counter-friction element 42 (here a first counter-friction element 44), and pre-tensioned with an axial force 46; and with a second friction zone 54, effective during relative rotational movement between the inner component 14 and the outer component 30, formed between a second friction element 50 and a second counter-friction element 52, and pre-tensioned with an axial force 46. The first friction element 40, acting as a spring element, exerts the axial force 46 on the first friction zone 48, and the second friction element 50, acting as a spring element, exerts the axial force 46 on the second friction zone 54.

[0039] The first counter-friction element 44 is formed integrally with the first disc component 32. The first friction element 40 is designed as a disc spring diaphragm 56 and is rotationally fixed to the inner component 14. The first friction element 40 is designed as a component separate from the spoke springs 16. The first friction element 40 is axially adjacent to the spoke springs 16 and radially overlaps the main part of the spoke springs 16. The first friction element 40 delineates an interior space 58 containing the spoke springs 16.

[0040] The first friction area 48 is formed by a first contact surface 60 of the first friction element 40 and a first counter-contact surface 62 of the first counter-friction element 44. The first counter-contact surface 62 is arranged on an axial side of the first counter-friction element 44 facing away from the spoke springs 16.

[0041] The second counter-friction element 52 is formed integrally with the second disc component 34. The second friction element 50 is designed as a disc spring diaphragm 56 and is rotationally fixed to the inner component 14. The second friction element 50 is designed as a component separate from the spoke springs 16. The second friction element 50 is axially adjacent to the spoke springs 16 and radially overlaps the main part of the spoke springs 16. The second friction element 50 also delimits the interior space 58 containing the spoke springs 16.

[0042] The second friction area 54 is formed by a second contact surface 64 of the second friction element 50 and a second counter-contact surface 66 of the second counter-friction element 52. The second counter-contact surface 66 is located on an axial side of the second counter-friction element 52 facing away from the spoke springs 16.

[0043] Alternatively or in addition to the arrangement of the first friction element 40, a further first friction element 68 can be arranged to form the first friction area or a further first friction area 70 on a further first counter-contact surface 72, which is arranged on an axial side of the first counter-friction element 44 facing the spoke springs 16.

[0044] Alternatively or in addition to the arrangement of the second friction element 50, a further second friction element 74 can be arranged to form the second friction area or a further second friction area 76 on a further second counter-contact surface 78 of the second counter-friction element 52, which is arranged on an axial side of the second counter-friction element 52 facing the spoke springs 16.

[0045] The first friction element 40 has fluid supply means 80, here referred to as first fluid supply means 82, for supplying the friction area with a cooling fluid. The first fluid supply means 82 comprise several through-openings 84 in the first friction element 40 for axial flow of the cooling fluid between a first axial side and an axially opposite second axial side of the first friction element 40. The through-openings 84 are configured to establish a fluid connection for supplying the interior 58 with the cooling fluid from the outside. The through-openings 84 are arranged radially overlapping with the spoke springs 16 and allow the cooling fluid to flow 86 through the first friction element 40 from the outside into the interior 58.

[0046] The second friction element 50 has second fluid supply means 88 for supplying the friction area with a cooling fluid. The second fluid supply means 88 comprise several through-openings 84 in the second friction element 50 for axial flow of the cooling fluid between a first axial side and an axially opposite second axial side of the second friction element 50. The through-openings 84 are configured to establish a fluid connection for supplying the interior 58 with the cooling fluid from the outside. The through-openings 84 are arranged radially overlapping with the spoke springs 16 and allow the cooling fluid to flow 90 through the second friction element 50 from the outside into the interior 58.

[0047] Figure 3 shows a section of a side view of a friction element of a torsional vibration damper in a further specific embodiment of the invention. The friction element 38 is preferably designed as a disc spring diaphragm 56. The friction element 38 has, shown here in partial and alternative form, fluid supply means 80, which comprise several circumferentially offset through-openings 84. The fluid supply means 80 act as fluid flow conveying means 92, conveying a fluid flow that supplies the friction area with the cooling fluid during a rotational movement 93 of the friction element 38 about the axis of rotation 12. The fluid flow conveying means 92 can be designed as first fluid flow conveying means 94 similar to fan blades or as second fluid flow conveying means 96 similar to pump blades. (Reference numeral list)

[0048] 10 Torsional vibration dampers 12 Rotation axis

[0049] 14 Interior component

[0050] 16 spoke springs

[0051] 18 Spoke spring washer 20 Outer ring

[0052] 22 inner ring

[0053] 24 radial direction

[0054] 26 axial direction

[0055] 28 Circumferential direction

[0056] 30 Exterior component

[0057] 32 first disc component 34 second disc component 36 friction device

[0058] 38 Friction element

[0059] 40 first friction element

[0060] 42 Counter friction element

[0061] 44 first counter-friction element 46 axial force

[0062] 48 first friction area

[0063] 50 second friction element

[0064] 52 second counter-friction element 54 second friction area

[0065] 56 T disc spring diaphragm

[0066] 58 Interior

[0067] 60 first investment area

[0068] 62 first counter-investment area second investment area

[0069] second counter-contact surface, further first friction element, further first friction area, further first counter-contact surface, further second friction element, further second friction area, further second counter-contact surface, fluid supply medium

[0070] first fluid supply means through-opening flow

[0071] second fluid supply means flow through fluid flow conveying means rotary motion

[0072] first fluid flow conveying device second fluid flow conveying device

Claims

Patent claims 1. Torsional vibration damper (10) for reducing torsional vibrations in a vehicle drive train, comprising an internal component (14) rotatable about a rotational axis (12) for connection with a rotatable connecting component of the drive train which exhibits torsional vibrations, several circumferentially spaced spoke springs (16), an outer component (30) which is connected to the inner component (14) via the spoke springs (16) in a rotating manner and which can be rotated to a limited extent against a spring force of the spoke springs (16) relative to the inner component (14), a friction device (36) with at least one friction area (48, 54) effective during relative rotational movement between the inner component (14) and the outer component (30) and formed between a friction element (38) and a counter-friction element (42), characterized in that the friction element (38) is designed as a component separate from the spoke springs (16) and has a fluid supply means (80) for supplying the friction area (48, 54) with a cooling fluid.

2. Torsional vibration damper (10) according to claim 1, characterized in that the friction element (38) is connected to the internal component (14) in a rotationally fixed manner.

3. Torsional vibration damper (10) according to claim 1 or 2, characterized in that the friction element (38) is arranged axially adjacent to the spoke springs (16) and radially overlapping the main part of the spoke springs (16).

4. Torsional vibration damper (10) according to one of the preceding claims, characterized in that the fluid supply means (80) are arranged radially overlapping with the spoke springs (16).

5. Torsional vibration damper (10) according to one of the preceding claims, characterized in that the friction area (48, 54) is preloaded with an axial force (46).

6. Torsional vibration damper (10) according to claim 5, characterized in that the friction element (38) acts as a spring element to exert the axial force (46).

7. Torsional vibration damper (10) according to one of the preceding claims, characterized in that the friction element (38) is designed as a disc spring diaphragm (56).

8. Torsional vibration damper (10) according to one of the preceding claims, characterized in that the fluid supply means (80) comprise at least one through-opening (84) in the friction element (38) for axial flow of the cooling fluid between a first axial side and an axially opposite second axial side of the friction element (38).

9. Torsional vibration damper (10) according to claim 8, characterized in that the friction element (38) delimits an interior space (58) having the spoke springs (16) and the through-opening (84) establishes a fluid connection for supplying the interior space (58) from the outside with the cooling fluid.

10. Torsional vibration damper (10) according to one of the preceding claims, characterized in that the fluid supply means (80) as fluid flow conveying means (92) convey a fluid flow supplying the friction area (48, 54) with the cooling fluid during a rotational movement of the friction element (38) about the axis of rotation (12).

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