Torsional vibration damper with axial spring element and friction element

Abstract

The invention relates to a torsional vibration damper for reducing torsional vibration. The invention relates to a damper assembly, comprising a first damper element that can be rotated about an axis of rotation, at least one spring element, and a second damper element that can be rotated about the axis of rotation and that can be rotated to a limited extent relative to the first damper element against the action of the spring element, a friction element which acts frictionally by forming a friction region between the first damper element and the second damper element, an axial spring element which is coupled to the second damper element in a rotationally fixed manner and which exerts an axial force on the friction region, the friction element has a friction surface which is assigned to the friction region and can be frictionally and torsionally attached to a counter-friction surface of the first damper element, wherein the axial spring element is connected to the friction element in a form-fitting manner in a rotationally fixed manner via a hollow pin which engages in the form-fitting bore.

Description

Technical Field

[0001] The invention relates to a torsional vibration damper according to the preamble of claim 1 . Background Art

[0002] DE 10 2018 130 872 A1 describes a torsional vibration damper having an input part and an output part, which can rotate together about an axis of rotation and can be twisted relative to each other in a limited manner. An arc spring, a friction ring and a disc spring diaphragm act between the input part and the output part.

[0003] DE 10 2014 209 902 A1 describes a friction ring which is fastened to a cover element. Summary of the invention

[0004] The object of the present invention is to make the friction of the friction area more uniform. The friction ring should have higher durability.

[0005] At least one of the objects is achieved by a torsional vibration damper having the features according to claim 1. As a result, the friction region can have a more uniform friction and the friction element can have a higher durability.

[0006] The torsional vibration damper can be arranged in a vehicle. The torsional vibration damper can be arranged in a drive train of a vehicle. The torsional vibration damper can be arranged in an efficient manner between a drive element, in particular an internal combustion engine, and a driven element, in particular a transmission.

[0007] The torsional vibration damper can be designed to be wet-running or dry-running. The torsional vibration damper can have a damper interior, in which the spring element is arranged. The damper interior can be at least partially filled with a lubricant, in particular a grease.

[0008] The torsional vibration damper can have a plurality of spring elements. The spring elements can be arranged distributed on the circumference. The spring elements can be compression springs or arc springs.

[0009] The torsional vibration damper can have a centrifugal pendulum and / or a torque limiter. The centrifugal pendulum and / or the torque limiter can be arranged inside or outside the damper interior. The centrifugal pendulum and / or the torque limiter can be assigned to the second damper element.

[0010] The first damper element can be a damper input element and the second damper element can be a damper output element.

[0011] The friction element can be implemented as a friction ring. The friction element can be made of plastic. The friction surface can be designed in one piece with the friction element. The provision of a separate friction lining for forming the friction surface can be omitted.

[0012] The friction element can be fixed axially between the axial spring element and the first damper element by the axial force of the axial spring element. The friction element can be displaced axially to the maximum extent against the axial force of the axial spring element. The friction element can permanently abut the first damper element axially during operation of the torsional vibration damper. The friction element can cause a basic hysteresis between the first damper element and the second damper element. The friction element can abut directly against the first damper element in a frictionally acting manner and can be torsionally abutted. The friction element can be arranged axially between the axial spring element and the first damper element.

[0013] The axial spring element can be a spiral spring membrane or a spiral spring.

[0014] The axial spring element can have a plurality of hollow pins, which engage in a form-fitting manner in corresponding form-fitting holes on the friction element. A plurality of hollow pins can be arranged on a common diameter or on different diameters. The hollow pins can be spaced apart from one another on the circumference. The hollow pins can be arranged evenly distributed on the circumference on the axial spring element. A plurality of hollow pins can be arranged radially, axially and / or overlapping one another on the circumference. At least one form-fitting hole, in particular a form-fitting hole adapted to the hollow pin, can be assigned to each hollow pin.

[0015] The hollow pin can be arranged on the axial spring element and the form-fitting hole can be arranged on the friction element. The hollow pin can be arranged on the friction element and the form-fitting hole can be arranged on the axial spring element. The hollow pin can be designed in one piece with the axial spring element. The form-fitting hole can be designed on the friction element. The hollow pin can be designed in one piece with the friction element. The form-fitting hole can be designed on the axial spring element.

[0016] In a preferred embodiment of the invention, it is advantageous if the axial spring element is constructed from spring steel. The spring steel can be a carbon spring steel, preferably a carbon spring steel with a carbon content between 0.5% and 1.0%, particularly preferably CK75 with a carbon content between 0.7% and 0.8%. The spring steel can be an alloy spring steel with additives, such as chromium, silicon and / or vanadium. The spring steel can be a stainless spring steel. The spring steel can be an oil-hardened spring steel.

[0017] The introduction of a hollow pin into a component made of spring steel, in particular the proposed axial spring element, is a very difficult measure that is usually avoided because the hollow pin must be designed with exact shape and position, which is particularly difficult in this material. Therefore, tests have surprisingly found that this design can meet the required conditions and requirements for the hollow pin.

[0018] In a preferred embodiment of the invention, the axial spring element is connected in a form-fitting manner to the coupling region of the friction element, wherein the coupling region is designed integrally with the friction element in a spring-like manner. This allows tolerance compensation of the components. Alternatively, the coupling region can be implemented integrally on the axial spring element, wherein the friction element is connected in a form-fitting manner to the coupling region. A hollow pin or a form-fitting hole can be arranged on the coupling region.

[0019] Even if the following description of the coupling region relates only to its design on the friction element, it can alternatively also be designed on the axial spring element, so that the two components: friction element and axial spring element can be interchanged with one another in the relevant description.

[0020] In an advantageous embodiment of the invention, the coupling region protrudes radially from the friction element starting from a protruding region on the friction element. The coupling region can protrude radially outward or inward from the protruding region. The protruding region can be a transition region between the disk-shaped main component and the coupling region. The protruding region can be a section protruding from a uniform and / or regular contour of the friction element.

[0021] The coupling region can protrude axially from the friction element. The coupling region can be designed to overlap the friction element axially.

[0022] In a preferred embodiment of the invention, it is advantageous if the coupling region extends from the projection region in the circumferential direction. The coupling region can be implemented on the friction element in a lever-like, web-like and / or arc-like manner.

[0023] In a preferred embodiment of the invention, it is advantageous that the coupling region extends parallel or evenly relative to the circumference of the friction element in the circumferential direction. The circumference can be the outer circumference or the inner circumference of the friction element. The coupling region can extend spaced apart from the circumference via a radial recess. The radial recess can be arranged radially between the coupling region and the circumference.

[0024] In a special embodiment of the invention, it is advantageous if the positive-fitting hole is embodied at a distance from the protruding area on the coupling area on the circumference side. The positive-fitting hole can be spaced apart from the protruding area in the radial direction.

[0025] In a special embodiment of the invention, it is advantageous that the hollow pin protrudes from the axial spring element in the axial direction. The hollow pin can have a hollow cylindrical axial projection. The projection can have an outer circumference, which abuts against the inner circumference of the form-fitting hole. The projection can have a central axis, which extends in the axial direction.

[0026] In a preferred embodiment of the invention, the hollow pin engages axially into the form-fitting hole. The hollow pin and the form-fitting hole can be arranged concentrically. The inner diameter of the form-fitting hole can be equal to or greater than the outer diameter of the hollow pin. The form-fitting connection can achieve radial centering between the axial spring element and the friction element.

[0027] In an advantageous embodiment of the invention, the torsional vibration damper is a dual mass flywheel, the first damper element comprises a primary flywheel and a cover element, and the mating friction surface is implemented on the cover element. The friction element can be frictionally engaged with the friction surface and can be torsionally abutted against the cover element.

[0028] Further advantages and advantageous embodiments of the invention are apparent from the description of the drawings and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be described in detail below with reference to the accompanying drawings, which specifically show:

[0030] Figure 1 A half-section view of a torsional vibration damper according to a special embodiment of the invention is shown.

[0031] Figure 2 Shows Figure 1 Partial three-dimensional cross section of a torsional vibration damper.

[0032] Figure 3 Shows Figure 2 A three-dimensional cross section of the friction element and the axial spring element.

[0033] Figure 4 A partial perspective cross section of a torsional vibration damper according to another special embodiment of the present invention is shown.

[0034] Figure 5 Shows Figure 4 A three-dimensional cross section of the friction element and the axial spring element. DETAILED DESCRIPTION

[0035] Figure 1 A half-section view of a torsional vibration damper of a special embodiment of the present invention is shown. The torsional vibration damper 10 is arranged in the drive train of a vehicle to reduce torsional vibrations and is designed as a dual mass flywheel 12. The torsional vibration damper 10 comprises a first damper element 16 that can rotate about an axis of rotation 14; a plurality of spring elements 22, in particular arc springs 24; and a second damper element 26 that can rotate about the axis of rotation 14 and can be rotated relative to the first damper element 16 in a limited manner against the action of the spring elements 22, the first damper element having a primary flywheel 18 and a cover element 20 fixedly connected thereto.

[0036] The second damper element 26 comprises an arc-shaped spring flange 28 coupled to the spring element 22 in a force-transmittable manner, a torque limiter 30 and a driven sleeve 32. The torque limiter 30 has a torque limiter input portion 34 and a torque limiter output portion 36 connected thereto in a frictional manner. The torque limiter output portion 36 is composed of a first support disc 38 and a second support disc 42 fixedly connected thereto via a plurality of rivet elements 40. The torque limiter input portion 34 is arranged axially between the first support disc 38 and the second support disc 42 and is preloaded and connected to the torque limiter output portion 36 in a frictional manner so as to transmit torque and limit the maximum transmission torque during torque transmission.

[0037] The arc-shaped spring flange 28 and the torque limiter input part 34 are designed in one piece. The driven sleeve 32 is fixedly connected to the torque limiter output part 36 via a rivet element 40 .

[0038] The axial spring element 44 is coupled to the second damper element 26 in a rotationally fixed manner via the rivet element 40. The axial spring element 44 exerts an axial force 46 between the first damper element 16 and the second damper element 26 on a friction element 50 which acts frictionally by forming a friction region 48. The friction element 50 comprises a friction surface 54 which is assigned to the friction region 48 and which rests frictionally and rotationally against a mating friction surface 52 of the first damper element 16. As a result, the friction element 50 can be rotated relative to the first damper element 16, here the cover element 20, in a frictionally locked manner and rests against the mating friction surface 52 on the cover element 20 in a prestressed manner by the axial force 46.

[0039] The friction ring 56 is arranged axially and frictionally between the driven sleeve 32 and the centering disk 58 fixed to the primary flywheel 18. Here, the friction ring 56 is indirectly pressed axially onto the contact section 60 of the centering disk 58 via the driven sleeve 32 by the axial force 46 of the axial spring element 44.

[0040] The axial spring element 44 and the friction element 50 as well as the friction ring 56 delimit a damper interior 62 in which the spring element 22 is arranged and which can be at least partially filled with a lubricant.

[0041] Figure 2 Shows Figure 1 . The axial spring element 44 is connected to the friction element 50 in a rotationally fixed form-fitting manner, and for this purpose the axial spring element 44 has a plurality of hollow pins 64, each of which is designed integrally with the axial spring element 44 and engages in a form-fitting manner in corresponding form-fitting holes 66 of the friction element 50. The axial spring element 44 is preferably a disc spring diaphragm 68 made of spring steel.

[0042] Figure 3 Shows Figure 2 A three-dimensional cross section of the friction element and the axial spring element in FIG. A torsionally fixed positive connection between the friction element 50 and the axial spring element 44 is formed by axially engaging a corresponding hollow pin 64 with a cylindrical and internally hollow projection 70 extending from the axial spring element 44 in the axial direction into the positive-fit hole 66. The projection 70 has an outer circumference 72, which abuts against an inner circumference 74 of the positive-fit hole 66.

[0043] Figure 4 A partial three-dimensional cross section of a torsional vibration damper of another special embodiment of the invention is shown. The axial spring element 44 is connected in a form-fitting manner to a coupling region 76 of the friction element 50, wherein the coupling region 76 is designed integrally with the friction element 50 in a spring-like manner and protrudes radially from the friction element 50 starting from a protruding region on the friction element 50.

[0044] Figure 5 Shows Figure 4 The coupling region 76 extends from the protruding region 78 in parallel along the circumferential direction 80 to the outer circumference 82 of the friction element 50. The coupling region 76 extends spaced apart from the outer circumference 82 by a radial recess 84 arranged radially between the coupling region 76 and the outer circumference 82.

[0045] The hollow pin 64 of the axial spring element 44 engages in a form-fitting manner in a form-fitting hole 66 which is spaced apart circumferentially from a raised area 78 on the coupling area 76, whereby the form-fitting hole 66 together with the radial recess 84 forms a spring-elastic connection on the raised area 78. The raised area 78 is a section starting from an outer circumference 82 of a uniform contour, here with a constant outer diameter, of the friction element 50.

[0046] Reference numerals list

[0047] 10 Torsional vibration damper

[0048] 12 Dual mass flywheel

[0049] 14 Axis of rotation

[0050] 16 First damper element

[0051] 18 Primary Flywheel

[0052] 20 Cover element

[0053] 22 Spring element

[0054] 24 Arc Spring

[0055] 26 Second damper element

[0056] 28 Arc Spring Flange

[0057] 30 Torque limiter

[0058] 32 Follower sleeve

[0059] 34 Torque limiter input

[0060] 36 Torque limiter output

[0061] 38 First support disc

[0062] 40 Riveting elements

[0063] 42 Second support plate

[0064] 44 Axial spring element

[0065] 46 Axial force

[0066] 48 Friction Area

[0067] 50 Friction element

[0068] 52 Mating friction surfaces

[0069] 54 Friction surface

[0070] 56 Friction ring

[0071] 58 Centering disc

[0072] 60 Snap section

[0073] 62 Internal space of shock absorber

[0074] 64 Hollow Pin

[0075] 66 Form-fitting hole

[0076] 68 disc spring diaphragm

[0077] 70 protrusion

[0078] 72 outer circumference

[0079] 74 Inner circumference

[0080] 76 Connection area

[0081] 78 Protruding area

[0082] 80 Circumferential direction

[0083] 82 outer circumference

[0084] 84 radial recess

Claims

1. A torsional vibration damper (10) for reducing torsional vibrations, the torsional vibration damper comprising: a first damper element (16) rotatable about an axis of rotation (14), at least one spring element (22), a second damper element (26) which is rotatable about the rotation axis (14) and which is twistable relative to the first damper element (16) to a limited extent against the action of the spring element (22), A friction element (50) which acts frictionally by forming a friction region (48) between the first damper element (16) and the second damper element (26), the friction element having a friction surface (54) assigned to the friction region (48), the friction surface (54) being able to rest frictionally and rotationally on a counter-friction surface (52) of the first damper element (16), an axial spring element (40) coupled to the second damper element (26) in a rotationally fixed manner and exerting an axial force (46) on the friction region (48), It is characterized in that The axial spring element (44) is connected to the friction element (50) in a form-fitting, rotationally fixed manner via a hollow pin (64) that engages in a form-fitting hole (66).

2. The torsional vibration damper (10) according to claim 1, characterized in that The axial spring element (44) is constructed from spring steel.

3. A torsional vibration damper (10) according to claim 1, 2 or the preamble of claim 1, characterized in that The axial spring element (44) is connected in a form-fitting manner to a coupling region (76) of the friction element (50), wherein the coupling region (76) is designed integrally with the friction element (50) in a spring-movable manner.

4. The torsional vibration damper (10) according to claim 3, characterized in that The coupling region (76) protrudes radially from the friction element (50) starting from a protruding region (78) on the friction element (50).

5. The torsional vibration damper (10) according to claim 4, characterized in that The coupling region (76) extends from the projection region (78) in a circumferential direction (80).

6. The torsional vibration damper (10) according to claim 5, characterized in that The coupling region (76) extends in a circumferential direction (80) parallel to the circumference of the friction element (50).

7. The torsional vibration damper (10) according to claim 1 or 2 and any one of claims 3 to 6, characterized in that The positive-fit hole (66) is spaced apart circumferentially from a projecting region (78) on the coupling region (76).

8. The torsional vibration damper (10) according to any one of the preceding claims, characterized in that The hollow pin (64) protrudes from the axial spring element (44) in the axial direction.

9. The torsional vibration damper (10) according to any one of the preceding claims, characterized in that The hollow pin (64) engages axially in the form-fitting hole (66).

10. The torsional vibration damper (10) according to any one of the preceding claims, characterized in that The torsional vibration damper (10) is a dual-mass flywheel (12), the first damper element (16) comprises a primary flywheel (18) and a cover element (20), and the mating friction surface (52) is embodied on the cover element (20).

Images