阅读说明：本技术 扭振减振器 (Torsional vibration damper ) 是由 T·扬茨 P·施特拉塞尔 S·比希纳 于 2019-10-16 设计创作，主要内容包括：本发明涉及一种扭振减振器(1),其包括围绕旋转轴线(d)布置的输入部分(2)和布置成相对于该输入部分、围绕该旋转轴线(d)并且克服弹簧单元(4)的作用可旋转的输出部分(3),其中该弹簧单元(4)在周向方向上分别在输入侧和输出侧上被压紧,并且在该弹簧单元(4)与该输出部分(3)的从动部分(16)之间布置有扭矩限制单元(5),该扭矩限制单元包括在该输出侧上压紧该弹簧单元(4)的凸缘部分(23)和布置在该凸缘部分两侧上的侧向部分(24、25),并且该侧向部分借助于轴向夹紧与该凸缘部分形成摩擦连接。为了能够以可再现的方式设置可经由该扭矩限制单元(5)传递的轮胎最大扭矩,借助于盘形弹簧(26)将该凸缘部分(23)夹紧在第一侧向部分和第二侧向部分(24、25)之间,该盘形弹簧轴向地支撑在该第一侧向部分(24)的逆向轴承(42)上并且抵靠该凸缘部分(23)轴向预张紧该第二侧向部分(25)。(The invention relates to a torsional vibration damper (1) comprising an input part (2) arranged about a rotational axis (d) and an output part (3) arranged relative to the input part, about the rotational axis (d) and rotatable against the action of a spring unit (4), wherein the spring unit (4) is compressed in the circumferential direction on the input side and on the output side, respectively, and a torque limiting unit (5) is arranged between the spring unit (4) and a driven part (16) of the output part (3), which torque limiting unit comprises a flange part (23) compressing the spring unit (4) on the output side and lateral parts (24, 25) arranged on both sides of the flange part, and which lateral parts form a frictional connection with the flange part by means of axial clamping. In order to be able to set in a reproducible manner the maximum torque of the tire which can be transmitted via the torque limiting unit (5), the flange section (23) is clamped between a first and a second lateral section (24, 25) by means of a cup spring (26) which is axially supported on a counter bearing (42) of the first lateral section (24) and axially pretensions the second lateral section (25) against the flange section (23).)

1. A torsional vibration damper (1) having an input part (2) arranged about an axis of rotation (d) and an output part (3) arranged rotatable relative to the axis of rotation (d) against the action of a spring unit (4), wherein the spring unit (4) is compressed in a circumferential direction on each of an input side and an output side, and between the spring unit (4) and a driven part (16) of the output part (3) there are torque limiting means (5) comprising a flange part (23) compressing the spring unit (4) on the output side and lateral parts (24, 25) arranged on both sides of the flange part and which are brought into frictional connection with the flange part by means of axial clamping, characterized in that the flange part (23) is clamped by means of leaf springs (26) on a first lateral part and a second lateral part (c r i s e d i n that the flange part (23) is clamped by means of leaf springs (26) on the first lateral part and the second lateral part (c r 24. 25) axially supported on a counter bearing (42) of the first lateral portion (24) and axially pretensioning the second lateral portion (25) against the flange portion (23).

2. Torsional vibration damper (1) according to claim 1, characterized in that the second lateral section (25) and the leaf spring (26) are rotatably received and centrally arranged on the counter bearing (42).

3. The torsional vibration damper of claim 1 or 2, characterized in that the first lateral portion and the driven portion, in particular a driven hub, are integrally connected to each other.

4. The torsional damper of claim 3, wherein the counter bearing is formed by a tab exposed from the first lateral portion.

5. The torsional vibration damper (1) as claimed in claim 1 or 2, characterized in that the driven part (16) is connected to the first lateral part (24) by means of a rivet (29) and the counter bearing (42) is formed by means of rivets (27) of the rivet (29) distributed over the circumference.

6. Torsional vibration damper (1) according to claim 5, characterized in that the driven part (16) is designed as a driven hub (17) and in that a hub flange (18) is connected to the first lateral portion (24) by means of the rivet (29).

7. Torsional vibration damper (1) according to claim 6, characterized in that the rivets (27) are designed as spacer bolts (30) which connect the first lateral section (24) to the hub flange (18) and have axially spaced seat heads (32) which form the counter bearing (42).

8. The torsional vibration damper (1) as claimed in one of claims 6 or 7, characterized in that the flange portion (23) is arranged centrally on the hub flange (18).

9. Torsional vibration damper (1) according to one of claims 1 to 8, characterized in that axially opposite friction linings (35) attached to the flange portion (23) or to the lateral portions (24, 25) are provided between the flange portion (23) and the lateral portions (24, 25).

10. Torsional vibration damper (1) according to claim 9, characterized in that the friction lining (35) is lubricated.

Technical Field

The invention relates to a torsional vibration damper having an input part arranged around a rotational axis and an output part arranged rotatable relative to the rotational axis against the action of a spring unit, wherein the spring unit is compressed in the circumferential direction on each of the input side and the output side, and between the spring unit and a driven part of the output part there is a torque limiting device which comprises a flange part compressing the spring unit on the output side and lateral parts arranged on both sides of the flange part and which are frictionally connected to the flange part by means of axial clamping.

Background

A generic torsional vibration damper is known, for example, from DE 102014218966 a 1. In this torsional vibration damper, a torque limiting device is provided between the spring unit and the driven hub, which torque limiting device is formed by a flange portion pressed against the spring unit on the output side and two lateral portions which grip the flange portion so as to form a frictional engagement defining a transmittable torque. The flange part is designed as a leaf spring radially on the inside, and the force edge of the flange part is axially pretensioned radially on the outside relative to the first lateral part and radially on the inside relative to the second lateral part. On the friction surface between the lateral part and the flange part, friction linings are arranged radially on top of each other.

Disclosure of Invention

The object of the invention is to further develop a universal torsional vibration damper. In particular, it is an object of the invention to set the maximum torque that can be transmitted via the torque limiting device in a reproducible manner.

This object is achieved by the subject matter of claim 1. The dependent claims represent advantageous embodiments of the subject-matter of claim 1.

The proposed torsional vibration damper is used for torsional vibration isolation, in particular for the drive train of a motor vehicle having an internal combustion engine subjected to torsional vibrations. For this purpose, the torsional vibration damper comprises an input part arranged to be rotatable about an axis of rotation and an output part arranged to be rotatable about the axis of rotation against the action of the spring unit relative thereto. The torsional vibration damper can be designed as a dual-mass flywheel, wherein the input part contains the primary flywheel mass and the output part contains the secondary flywheel mass. The secondary flywheel mass can be arranged at least partially in a downstream drive train device, such as a double clutch, a hydrodynamic torque converter or the like, to which the output part is connected in a rotationally locked manner. The input part can be received on the crankshaft by means of the fastening opening, if necessary by inserting a reinforcing ring.

The input section can form, for example, a ring chamber radially on the outside by means of two disk sections, in which the spring unit is received. The spring unit is formed, for example, by a plurality of bow springs or a bow spring set having bow springs arranged distributed over the circumference, nested one inside the other.

The spring unit is effectively arranged in the circumferential direction between the input portion and the output portion. The input portion and the output portion are mounted to each other by means of bearings (e.g., sliding bearings or roller bearings). Alternatively, the input section is arranged centrally on the crankshaft and the output section is arranged centrally on a shaft, such as a transmission input shaft of a gearbox or a stub shaft of a drive train device connected upstream of the gearbox, wherein a corresponding axial offset is provided in the torsional vibration damper, for example on a hold-down device of a spring unit.

The input and output sections have said hold-down means engaged between adjacent end faces of the bow springs. The input portion has an embossing (embossing) formed in, for example, a disc portion of the annular chamber. The output portion has a flange portion whose radially widened arms are engaged between end faces of bow springs adjacent in the circumferential direction.

The torque limiting device is disposed between the spring unit and the driven portion of the output portion. The driven part is understood to be, for example, a driven hub which is connected to an externally toothed shaft or stub shaft by means of internal toothing in a rotationally locked manner. Alternatively, the driven part can be designed as a flywheel mass disk which receives the clutch pressure plate to form a friction clutch.

The torque limiting device comprises a flange portion which presses the spring unit on the output side and lateral portions which are arranged on both sides of the flange portion and which produce a frictional connection by means of axial clamping. The torque limiting device is preferably arranged radially inside the spring unit.

For further torsional isolation, so that for example the primary flywheel mass of the input part and the secondary flywheel mass of the output part are combined to support the torsional damping of the spring unit, at least one centrifugal pendulum may be integrated into the torsional damper, which may be arranged, for example, axially beside the spring unit, radially inside the spring unit, axially beside the torque limiting device, or at another location.

In the proposed torsional vibration damper, the torque limiting device for setting a precisely adjustable maximum torque that can be transmitted via the torque limiting device is designed in such a way that the flange part is clamped between the first and the second lateral part by means of a leaf spring that is axially supported on a counter bearing (counter bearing) of the first lateral part and axially pretensions the second lateral part against the flange part. This means that one lateral part is axially pretensioned relative to the other lateral part and that the flange part itself is designed flat without force edges. Thus, axially opposite friction surfaces are formed between the lateral parts and the flange parts, and almost the entire surface of the friction surfaces is above the overlap of the flange parts and the lateral parts, so that the friction surfaces are increased and reproducible by the pretension exerted on the lateral parts from the outside by means of external leaf springs. The maximum torque that can be transmitted can also be increased due to the enlarged friction surface, or, with a smaller pretension, a smaller torque can be transmitted with improved accuracy.

The counter bearing is for axially supporting the plate spring and has a stop surface axially spaced from the first lateral portion so that the flange portion, the second lateral portion and the plate spring and their axial spring travel can be accommodated between the first lateral portions. It has proved advantageous if the counter bearing enables a rotational connection of the leaf spring and the second lateral portion with the first lateral portion, thereby exclusively providing a relative rotation of the flange portion with respect to the lateral portion on the friction surface of the friction lining. Furthermore, it has proven to be advantageous if the second lateral section and the leaf spring are arranged centrally on the counter bearing.

For example, the first lateral portion and the driven portion (in particular, the driven hub) of the output portion may be integrally connected to each other. Here, tabs distributed over the circumference can emerge from the first lateral section, which tabs form the counter bearing. Alternatively, the spacer bolts may be circumferentially distributed on corresponding pitch circles on the first lateral portion.

According to a preferred embodiment of the torsional vibration damper, the driven part of the output section is connected to the first lateral section by means of rivets, and the counter bearing is formed by means of rivets of the rivets distributed over the circumference. The driven portion may be designed as a driven hub, wherein a hub flange of the driven hub is connected to the first lateral portion by means of a rivet. The rivets may be designed as stepped bolts connecting the first lateral portion to the hub flange and letting the setting head form a counter bearing at an axial distance from each other. In order to increase the rigidity of the torque limiting device, the second rivet can be provided with rivets in addition to the first rivet forming the counter bearing, which rivets are distributed radially over a larger pitch circle on a circumference of the first rivet other than the pitch circle.

In a further embodiment, the driven part can be designed as a secondary disk flywheel forming a secondary flywheel mass, which is connected to the first lateral part, for example by means of spacer bolts forming rivets. The second lateral portion and the disk spring are accommodated between the secondary disk flywheel and the first lateral portion at an axial distance, the leaf spring and the lateral portion being axially supported on the secondary disk flywheel and arranged centrally on the spacer bolt in a rotationally locked manner.

The hub flange of the driven hub may be arranged axially between the lateral portions and with the flange portion centrally disposed on its outer circumference.

The friction lining may be lubricated in order to improve the regulation of the maximum torque transmittable via the torque limiting device. Furthermore, the spring unit accommodated in the annular chamber can be lubricated. Sufficient lubrication of the spring unit and the torque limiting device arranged radially directly inside the spring unit means that the friction lining of the torque limiting device can be lubricated during the service life.

Drawings

The invention is explained in more detail with reference to exemplary embodiments in a single figure. The figure shows in a sectional view an upper part of a torsional vibration damper arranged to be rotatable about an axis of rotation.

Detailed Description

The figure shows in cross section the upper part of a torsional vibration damper 1 arranged around an axis of rotation d, comprising an input part 2 and an output part 3 with a torque limiting device 5, which is rotatable relative to the axis of rotation d against the action of a spring unit 4.

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

The disc portion 10 and the disc portion 11 are tightly connected to each other (as here welded). The disc portion 11 receives the mass ring 9 at its radially outer axial extension. The disc portions 10, 11 form an annular chamber 12 in which the spring unit 4 is accommodated. The spring unit 4 is formed by a bow spring set 13 with bow springs 14, 15 arranged distributed over the circumference, nested one inside the other. The end faces of the bow springs 14, 15 adjacent in the circumferential direction are each pressed on the input side by a pressing device (not shown), for example an embossing provided in the disk portions 10, 11.

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

The torque limiting device 5 comprises a flange portion 23, two lateral portions 24, 25, a leaf spring 26 and rivets 27 distributed over the circumference. The flange portion 23 serves to act on the bow springs 14, 15 on the output side and has for this purpose radially widened arms 28 which engage between circumferentially adjacent end faces of the bow springs 14, 15 and press the bow springs in both circumferential directions.

The first lateral portion 24 is connected to the hub flange 18 of the driven hub 17 by means of rivets 27 of a rivet 29. The rivet 27 is designed as a spacer bolt 30 with an axially widened region 31 and a setting head 32 adjoining it. The second lateral portion 25 and the leaf spring 26 are received and arranged centrally on the expansion region 31 in a rotationally locked manner by means of the inner contours 33, 34. The leaf spring 26 is axially supported on the setting head 32 and is axially pretensioned against the second lateral portion 25, which forms a frictional clamping connection with the flange portion 23 with the first lateral portion 24. The setting head 32 of the rivet 27 forms a counter bearing 42 for the leaf spring 26, which is connected to the first lateral portion 24.

Arranged on both sides of the flange portion 23 are friction linings 35 which are arranged axially opposite one another and substantially occupy the clamping surfaces between the lateral portions 24, 25 and the flange portion 23. In an alternative embodiment, the friction lining 35 may be attached to the lateral portions 24, 25. The friction lining 35 may be glued to the corresponding component and for example be made as a paper lining or as a friction plate from a material mixture with a friction material. Due to the flat friction surface between the friction lining and the counter-friction surface made of steel, a reproducible and possibly high friction torque can be set depending on the pretensioning of the leaf spring 26. Due to the sustainable and low-friction operation of the annular chamber 12, which is arranged radially directly outside the flange portion 23 and filled with lubricant for lubricating the spring unit 4, a constant setting of the maximum torque that can be transmitted via the torque limiting device 5 is achieved during the service life.

In order to provide the basic friction between the input part 2 and the output part 3, i.e. the sealing of the annular chamber 12, for the axial positioning of the output part 3 relative to the input part 2, two friction rings 36, 37 are provided, which are held in a rotationally fixed manner in the disc parts 10, 11 by means of pins 38. The axial pretensioning and positioning of the output part 3 relative to the input part 2 is performed by a leaf spring 39 which is supported on the second lateral part 25 and is arranged centrally on the leaf spring 26. The leaf spring 39 is pretensioned against the friction ring 37 so that the first lateral portion 24 abuts the friction ring 36. In order to produce the effect of the torque limiting device 5, the axial pretension of the leaf spring 39 is substantially negligible in comparison to the leaf spring 26.

In order to make the torque limiting device 5 more rigid, it is also possible to provide a rivet 40 between the first lateral portion 24 and the hub flange 18 with a larger diameter, in addition to the rivet 29, by means of a rivet 41 arranged on the circumference.

Description of the reference numerals

1 torsional vibration damper 2 input section 3 output section 4 spring unit 5 torque limiting device 6 screws 7 crankshaft 8 drive plate 9 mass ring 10 disc section 11 disc section 12 annular chamber 13 bow spring set 14 bow spring 15 bow spring 16 driven section 17 driven hub 18 hub flange 19 hub 20 internal teeth 21 shaft 22 flange section 24 lateral section 25 leaf spring 28 rivet 28 arm 29 rivet 30 expanded area 32 seat head 33 internal profile 34 friction liner 36 friction ring 37 friction ring 38 pin 39 leaf spring 40 rivet 41 rivet 42 reverse bearing d axis of rotation