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 shock absorber, comprising a first shock absorber element which can be rotated about a rotational axis, at least one spring element, a second shock absorber element which can be rotated about the rotational axis and which can be rotated to a limited extent relative to the first shock absorber element against the action of the spring element, and an axial spring element which is connected to the second shock absorber element in a rotationally fixed manner and provides an axial force, a friction element which acts frictionally between the first damper element and the second damper element and is loaded by an axial force, the first damper element having a cover element, the friction element can be rotated in a frictional manner relative to the first damper element and is connected to the axial spring element in a form-fitting manner in a rotationally fixed manner, and has at least one form-fitting connection element which engages in a circumferential recess of the axial spring element in a form-fitting manner.

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. Summary of the invention

[0003] The technical problem to be solved by the invention is to set the friction between the first damper element and the second damper element more precisely. The friction should remain constant. The components of the torsional vibration damper should be more reliable. The torsional vibration damper should be more cost-effective and space-saving.

[0004] At least one of the technical problems is solved by a torsional vibration damper having the features according to claim 1. As a result, the friction between the first damper element and the second damper element can be set more precisely. The friction can be kept constant.

[0005] 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.

[0006] The first damper element can be arranged on the damper input side. The second damper element can be arranged on the damper output side.

[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 axial spring element can be designed as a spiral spring or a spiral spring membrane.

[0010] The friction element can be designed as a friction ring. The friction element can be made of a material different from the axial spring element and / or the first damper element. The friction element can be made of plastic. 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 move axially to the maximum extent against the axial force of the axial spring element. The friction element can be permanently axially abutted against the first damper element. The friction element can cause a basic hysteresis between the first damper element and the second damper element. The friction element can be directly frictionally abutted against the first damper element in a rotatable manner. The friction element can be arranged axially between the axial spring element and the first damper element.

[0011] The friction element can be arranged axially in an effective manner between the axial spring element and the first damper element. A friction-acting coupling of the axial spring element to the first damper element can be dispensed with.

[0012] The friction element is rotatable frictionally relative to the first damper element within a torsional play that is achieved between the first damper element and the second damper element via the spring element.

[0013] The friction element can have a plurality of form-fitting connection elements spaced apart from each other on the circumferential side. The form-fitting connection elements can be engaged in the circumferential recesses respectively in a form-fitting manner. A form-fitting connection pair consisting of the form-fitting connection element and the circumferential recess can fix the friction element and the axial spring element to each other in a first circumferential direction in a rotationally fixed manner. Another form-fitting connection pair consisting of another form-fitting connection element and another circumferential recess can fix the friction element and the axial spring element to each other in a rotationally fixed manner in a second, opposite circumferential direction. The form-fitting connection element of this form-fitting connection pair and the other form-fitting connection element can be spaced apart from each other on the circumferential side in the second circumferential direction. The form-fitting connection element of the other form-fitting connection pair and the other form-fitting connection element can be spaced apart from each other in the first circumferential direction. Only by two form-fitting connection pairs can the friction element be fixed to the axial spring element in a rotationally fixed manner in the first circumferential direction and the second circumferential direction.

[0014] The friction element can be fixed in a rotationally fixed manner on the axial spring element in both circumferential directions by means of a positive-locking engagement between the positive-locking element and the circumferential recess.

[0015] In a preferred embodiment of the invention, it is advantageous if the circumferential recess is arranged on the outer circumference of the axial spring element. The outer circumference can have a constant diameter. The circumferential recess can have a trapezoidal profile when viewed from the axial side. The profile can be rectangular. The form-fitting connection element can match the profile of the circumferential recess. The form-fitting connection element can have a trapezoidal profile when viewed from the axial side. The profile can be rectangular.

[0016] In a special embodiment of the invention, it is advantageous if the form-fitting element comprises a projection protruding from the friction element, which projection engages in the circumferential recess. The form-fitting element, in particular the projection, can form a one-piece component with the friction element.

[0017] In an advantageous embodiment of the invention, the friction element has a radial section and the projection protrudes axially from the radial section. The radial section can extend at least in regions parallel to the first damper element.

[0018] In an advantageous embodiment of the invention, the radial section has a projection on a first axial side and a friction surface for frictionally abutting against the first damper element on an axially opposite second axial side. The projection and the friction surface can overlap at least partially in the radial direction. The first damper element can have a counter-friction surface for frictionally abutting against the friction surface.

[0019] A preferred embodiment of the present invention is advantageous in which the axial spring element exerts an axial force on a first axial side of the friction element. The axial spring element can bear axially against the friction element.

[0020] In an advantageous embodiment of the invention, the friction element has an axial section from which the projection radially projects. The axial section can have a constant diameter. The axial section can be connected to the radial section. The axial section can be connected to the radial section radially on the outside. The axial section can extend from the radial section in an axial direction axially away from the friction surface.

[0021] In a special embodiment of the invention, it is advantageous if the projection projects radially inwards starting from the axial section. The projection can be arranged in the transition between the axial section and the radial section.

[0022] In a special embodiment of the invention, it is advantageous if the axial section is arranged radially outside the axial spring element. The axial section can be arranged radially inside the spring element.

[0023] A preferred embodiment of the invention is advantageous, wherein the torsional vibration damper is designed as a dual mass flywheel, the first damper element comprises a primary flywheel and the second damper element comprises a secondary flywheel. The dual mass flywheel can have a centrifugal pendulum and / or a torque limiter. The centrifugal pendulum and / or the torque limiter can be arranged on the damper output side, in particular on the second damper element.

[0024] 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

[0025] The present invention will be described in detail below with reference to the accompanying drawings, which specifically show:

[0026] Figure 1 A perspective cutaway view of a half of a torsional vibration damper according to a special embodiment of the invention is shown.

[0027] Figure 2 Shows Figure 1 Detail of a three-dimensional cross section of a torsional vibration damper.

[0028] Figure 3 Shows Figure 1 Detail of the side view of the torsional vibration damper. DETAILED DESCRIPTION

[0029] Figure 1 A three-dimensional cutaway view of a half of a torsional vibration damper according to a special embodiment of the invention is shown. The torsional vibration damper 10 is arranged between a drive element, such as an internal combustion engine, and a driven element, such as a transmission, to reduce torsional vibrations. The torsional vibration damper is designed as a dual mass flywheel 12, having a first damper element 16 that can rotate about an axis of rotation 14, the first damper element comprising a primary flywheel 18 and a cover element 20 fixedly connected thereto. The primary flywheel 18 and the cover element 20 form an inner damper space 22, in which a plurality of spring elements 24, in particular arc springs 26, are accommodated. The inner damper space 22 can be at least partially filled with a lubricant, such as grease.

[0030] The second damper element 28 can rotate about the rotation axis 14 and can be twisted relative to the first damper element 16 in a limited manner against the action of the spring element 24. The second damper element 28 comprises an arcuate spring flange 30, which is coupled to the spring element 24 in a force-transmitting manner. The second damper element 28 is supported on the first damper element 16 via a bearing element 32. The second damper element 28 also comprises a secondary flywheel 36 which is fixedly connected to the arcuate spring flange 30 via at least one rivet element 34.

[0031] The axial spring element 38 is connected to the second damper element 28 in a rotationally fixed manner. The axial spring element 38 is preferably a disc spring diaphragm 40 and is riveted to the second damper element 28 via at least one rivet element, preferably via a rivet element 34, by means of which the secondary flywheel 36 is connected to the arc spring flange 30. The axial spring element 38 loads the friction element 42 with an axial force 44.

[0032] The friction element 42 is frictionally arranged between the first damper element 16 and the second damper element 28 , in particular here between the axial spring element 38 and the cover element 20 , and is frictionally rotatable relative to the first damper element 16 , here the cover element 20 , by being acted upon by the axial force 44 .

[0033] The friction element 42 is designed as a friction ring 46 and is connected to the axial spring element 38 in a rotationally fixed form-fitting manner. For this purpose, the friction element 42 has at least one form-fitting element 48 protruding from the friction element 42, which engages in a circumferential recess 50 of the axial spring element 38 in a form-fitting manner.

[0034] Figure 2 Shows Figure 1 3D cutaway of a torsional vibration damper in FIG. ...

[0035] The friction element 42 has a radial section 56, from which a projection 54 projects axially, and the radial section has the projection 54 on a first axial side 58 and a friction surface 62 on an axially opposite second axial side 60, which is used to frictionally abut against the first damper element 16, here against a mating friction surface 64 of the cover element 20.

[0036] The axial force 44 of the axial spring element 38 is applied to the first axial side 58 of the friction element 42. The axial spring element 38 rests axially on the friction element 42. The radial section 56 transitions radially outwardly into an axial section 66 which is arranged radially within the spring element 24 and radially outside the axial spring element 38, and has a preferably constant diameter, from which the projection 54 projects radially inwardly. The projection 54 is arranged in the transition between the axial section 66 and the radial section 56.

[0037] Figure 3 Shows Figure 1. The circumferential recess 50 has a trapezoidal, in particular rectangular, contour when viewed from the axial side. The form-fitting connection element 48 matches the contour of the circumferential recess 50 and accordingly has a trapezoidal, in particular rectangular, contour. The friction element 42 has a plurality of form-fitting connection elements 48 spaced apart on the circumferential side, which are each engaged in a form-fitting manner in a circumferential recess 50 on the axial spring element 38. By means of the form-fitting connection between the form-fitting connection elements 48 and the circumferential recess 50, the friction element 42 and the axial spring element 38 are connected to each other in a rotationally fixed manner in both circumferential directions.

[0038] Reference numerals list

[0039] 10 Torsional vibration damper

[0040] 12 Dual mass flywheel

[0041] 14 Axis of rotation

[0042] 16 First damper element

[0043] 18 Primary Flywheel

[0044] 20 Cover element

[0045] 22 Internal space of shock absorber

[0046] 24 Spring element

[0047] 26 Arc Spring

[0048] 28 Second damper element

[0049] 30 Curved Spring Flange

[0050] 32 Bearing elements

[0051] 34 Riveting elements

[0052] 36 Secondary Flywheel

[0053] 38 Axial spring element

[0054] 40 disc spring diaphragm

[0055] 42 Friction element

[0056] 44 Axial force

[0057] 46 Friction ring

[0058] 48 Form-fitting connection elements

[0059] 50 Circumferential concave

[0060] 52 outer circumference

[0061] 54 protrusion

[0062] 56 Radial Segments

[0063] 58 First axial side

[0064] 60 Second axial side

[0065] 62 Friction surface

[0066] 64 Mating friction surface

[0067] 66 Axial section

[0068] 68 Transition

Claims

1. A torsional vibration damper (10) for reducing torsional vibration, the torsional vibration damper having A first damper element (16) which is rotatable about an axis of rotation (14), the first damper element (16) having a cover element (20), at least one spring element (24), a second damper element (28) which is rotatable about the rotation axis (14) and which is twistable relative to the first damper element (16) in a limited manner against the action of the spring element (24), an axial spring element (38) which is connected to the second damper element (28) in a rotationally fixed manner and provides an axial force (44), a friction element (42) which acts frictionally between the first damper element (16) and the second damper element (28) and is loaded by the axial force (44), It is characterized in that The friction element (42) is rotatable relative to the first damper element (16) in a frictionally acting manner and is connected to the axial spring element (38) in a rotationally fixed form-fitting manner, and for this purpose the friction element (42) has at least one form-fitting element (48) which engages in a form-fitting manner in a circumferential recess (50) of the axial spring element (38).

2. The torsional vibration damper (10) according to claim 1, characterized in that The circumferential recess (50) is arranged on an outer circumference (52) of the axial spring element (38).

3. The torsional vibration damper (10) according to claim 1 or 2, characterized in that: The form-fitting connection element (48) comprises a projection (54) which projects from the friction element (42) and engages in the circumferential recess (50).

4. The torsional vibration damper (10) according to claim 3, characterized in that The friction element (42) has a radial section (56), and the projection (54) projects axially from the radial section (56).

5. The torsional vibration damper (10) according to claim 4, characterized in that The radial section (56) has a projection (54) on a first axial side (58), and the radial section (56) has a friction surface (62) on a second axial side (60) axially opposite the first axial side (58) for frictionally abutting against the first damper element (16).

6. The torsional vibration damper (10) according to claim 5, characterized in that The axial spring element (38) applies the axial force (44) to a first axial side (58) of the friction element (42).

7. The torsional vibration damper (10) according to any one of claims 3 to 6, characterized in that The friction element (42) has an axial section (66), and the projection (54) projects radially from the axial section (66).

8. The torsional vibration damper (10) according to claim 7, characterized in that The projection (54) projects radially inwardly from the axial section (66).

9. The torsional vibration damper (10) according to claim 7 or 8, characterized in that The axial section (66) is arranged radially outside the axial spring element (38).

10. The torsional vibration damper (10) according to any one of the preceding claims, characterized in that The torsional vibration damper (10) is designed as a dual mass flywheel (12), the first damper element (16) comprising a primary flywheel (18) and the second damper element (28) comprising a secondary flywheel (36).

Images