Torsional vibration damper

Abstract

A torsional vibration damper comprising an input part arranged about an axis of rotation and an output part arranged such that it can rotate relative to same, about the axis of rotation and against the effect of a spring unit is provided. The spring unit is impacted in the peripheral direction respectively on the input side and the output side, and a torque-limiting unit, including a flange part impacting the spring unit on the output side and lateral parts arranged on both sides of the flange part and forming a frictional connection with same by means of an axial clamping, is arranged between the spring unit and a driven part of the output part. The flange part is clamped between a first and a second lateral part by a disc spring axially supported on a counter bearing of the first lateral part and axially pretensioning the second lateral par against the flange part.

Claims

1. A torsional vibration damper comprising: an input part arranged about an axis of rotation; an output part arranged so as to be rotatable relative to the axis of rotation against an action of a spring unit, wherein the spring unit is impacted on each of an input side and output side in a peripheral direction; and a torque-limiting device disposed between the spring unit and a driven part of the output part and including a flange part impacting the spring unit on the output side and lateral parts arranged on both sides of the flange part and producing a frictional connection therewith by an axial clamping, wherein the flange part is clamped between a first and a second lateral part by a plate spring axially supported on a counter bearing of the first lateral part and axially pretensioning the second lateral part against the flange part.

2. The torsional vibration damper according to claim 1, wherein the second lateral part and the plate spring are rotatably received and centered on the counter bearing.

3. The torsional vibration damper according to claim 1, wherein the first lateral part and the driven part are integrally connected to one another.

4. The torsional vibration damper according to claim 3, the counter bearing is formed from rivets connected to the first lateral part.

5. The torsional vibration damper according to claim 1, wherein the driven part is connected to the first lateral part by a riveting connection and the counter bearing is formed by rivets of the riveting connection distributed over a circumference.

6. The torsional vibration damper according to claim 5, wherein the driven part is designed as a driven hub and a hub flange is connected to the first lateral part by the riveting connection.

7. The torsional vibration damper according to claim 6, wherein the rivets are designed as spacer bolts which connect the first lateral part to the hub flange and have axially spaced setting heads forming the counter bearing.

8. The torsional vibration damper according to claim 6, wherein the flange part is centered on the hub flange.

9. The torsional vibration damper according to claim 1, wherein axially opposite friction linings attached to the flange part or to the lateral parts are provided between the flange part and the lateral parts.

10. The torsional vibration damper according to claim 9, wherein the friction linings are greased.

11. A torsional vibration damper comprising: an input part rotatable about an axis of rotation; an output part rotatable about the axis of rotation against an action of a spring unit, wherein the output part includes a driven hub and hub flange; and a torque-limiting device disposed between the spring unit and the driven hub, wherein the torque-limiting device includes: a flange part engaged with the spring unit on an output side; a first lateral part and a second lateral part arranged on axially opposite sides of the flange part; and a plate spring axially supported on a counter bearing and configured to clamp the flange part between the first and the second lateral parts, wherein the hub flange of the output part is connected to the first lateral part by a riveted connection and the counter bearing is formed by rivets of the riveted connection distributed over a circumference thereof.

12. The torsional vibration damper according to claim 11, wherein the rivets include an axial section and the second lateral part and the plate spring are received and centered in a rotationally locked manner on the axial section.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The disclosure is explained in more detail with reference to the exemplary embodiment in the single FIGURE. This shows the upper part of a torsional vibration damper arranged to be rotatable about an axis of rotation, in section.

DETAILED DESCRIPTION

[0021] The FIGURE shows the upper part of the torsional vibration damper 1 arranged about the axis of rotation d in section with the input part 2, and the output part 3 with the torque-limiting device 5, which can be rotated relative to the axis of rotation d against the action of the spring unit 4.

[0022] The input part 2 is received on the crankshaft 7 by means of the screws 6. The drive plate 8 with the fastening openings for the screws 6 is designed to be axially flexible to dampen axial, shielding and/or wobble vibrations of the crankshaft 7 and is connected to the mass ring 9 and the disk part 10 radially on the outside by means of screws (not shown).

[0023] The disk part 10 and the disk part 11 are tightly connected to one another, as welded here. The disk part 11 receives the mass ring 9 at its radially outer axial extension. The disk parts 10, 11 form the annular chamber 12 in which the spring unit 4 is housed. The spring unit 4 is formed from bow spring sets 13 with bow springs 14, 15 nested one inside the other, which are arranged distributed over the circumference. The end faces of the bow springs 14, 15, which are adjacent in the peripheral direction, are each impacted on the input side by impacting devices (not shown), for example embossings provided in the disk parts 10, 11.

[0024] The output part 3 contains the torque-limiting device 5 arranged radially inside the spring unit 4 and the driven part 16, which is designed as a driven hub 17 with the hub flange 18 and the hub 19 with the internal toothing 20. The hub 19 is rotatably connected to the external toothing 22 of the shaft 21 or a stub shaft. In the ideal case, the axis of rotation d corresponds to the axis of rotation of the shaft 21. In the event of an axial offset, compensation occurs internally between the input part 2 and the output part 3, for example on the spring unit 4.

[0025] The torque-limiting device 5 contains the flange part 23, the two lateral parts 24, 25, the plate spring 26 and the rivets 27 distributed over the circumference. The flange part 23 serves to act on the bow springs 14, 15 on the output side and has radially widened arms 28 for this purpose, which engage between the peripherally adjacent end faces of the bow springs 14, 15 and impact on them in both peripheral directions.

[0026] The first lateral part 24 is connected to the hub flange 18 of the driven hub 17 by means of the rivets 27 of the riveting 29. The rivets 27 are designed as spacer bolts 30 which have the axial widening area 31 and the setting head 32 adjoining the same. The second lateral part 25 and the plate spring 26 are received and centered in a rotationally locked manner on the expansion areas 31 by means of internal profiles 33, 34. The plate spring 26 is axially supported on the setting heads 32 and is axially pretensioned against the second lateral part 25, which forms with the first lateral part 24 a frictional clamping connection with the flange part 23. The setting heads 32 of the rivets 27 form the counter bearing 42, which is connected to the first lateral part 24, for the plate spring 26.

[0027] Friction linings 35 are arranged on both sides of the flange part 23, which are arranged axially opposite one another and substantially occupy the clamping surface between the lateral parts 24, 25 and the flange part 23. In an alternative embodiment, the friction linings 35 can be attached to the lateral parts 24, 25. The friction linings 35 can be glued to the corresponding components and made, for example, as paper linings, from material mixtures with friction material or as friction plates. Because of the flat friction surfaces between the friction linings and counter-friction surfaces made of steel, a reproducible and possibly high friction torque can be set depending on the pretension of the plate spring 26. Due to a sustainable and low-friction operation of the annular chamber 12, which is arranged radially directly outside the flange part 23 and filled with lubricant for greasing the spring unit 4, a constant setting of the maximum torque which can be transmitted via the torque-limiting device 5 is achieved over the service life.

[0028] To set a basic friction between the input part 2 and output part 3, a seal of the annular chamber 12, for the axial positioning of the output part 3 relative to the input part 2, the two friction rings 36, 37 are provided, which are held in the disk parts 10, 11 in a rotationally fixed manner by means of pins 38. The axial pretensioning and positioning of the output part 3 with respect to the input part 2 is performed by the plate spring 39, which is supported on the second lateral part 25 and centered on the plate spring 26. The plate spring 39 is pretensioned against the friction ring 37, so that the first lateral part 24 abuts the friction ring 36. The axial pretensioning of the plate spring 39 is substantially negligible compared to the plate spring 26 for developing the effect of the torque-limiting device 5.

[0029] In order to make the torque-limiting device 5 more rigid, in addition to the riveting 29, the riveting 40 can be provided between the first lateral part 24 and the hub flange 18 with a larger diameter by means of the rivets 41 arranged over the circumference.

LIST OF REFERENCE NUMBERS

[0030] 1 Torsional vibration damper [0031] 2 Input part [0032] 3 Output part [0033] 4 Spring unit [0034] 5 Torque-limiting device [0035] 6 Screw [0036] 7 Crankshaft [0037] 8 Drive plate [0038] 9 Mass ring [0039] 10 Disk part [0040] 11 Disk part [0041] 12 Annular chamber [0042] 13 Bow spring set [0043] 14 Bow spring [0044] 15 Bow spring [0045] 16 Driven part [0046] 17 Driven hub [0047] 18 Hub flange [0048] 19 Hub [0049] 20 Internal toothing [0050] 21 Shaft [0051] 22 External toothing [0052] 23 Flange part [0053] 24 Lateral part [0054] 25 Lateral part [0055] 26 Plate spring [0056] 27 Rivet [0057] 28 Arm [0058] 29 Riveting [0059] 30 Spacer bolt [0060] 31 Expansion area [0061] 32 Setting head [0062] 33 Internal profile [0063] 34 Internal profile [0064] 35 Friction lining [0065] 36 Friction ring [0066] 37 Friction ring [0067] 38 Pin [0068] 39 Plate spring [0069] 40 Riveting [0070] 41 Rivet [0071] 42 Counter bearing [0072] d Axis of rotation