Device comprising a pulley decoupler and a torsional damper

Abstract

The invention relates to a device (1) comprising a belt pulley decoupler (2) and a torsional vibration damper (3), which have a common axis of rotation (4), wherein the belt pulley decoupler (2) has an input side (5) and an output side (6) and at least one first spring element (7) acting between the input side (5) and the output side (6), the input side (5) and the output side (6) being able to be twisted relative to one another in a circumferential direction (8) against the spring action of the at least one first spring element; wherein the torsional vibration damper (3) has a flange part (9) and is connected to the input side (5) in a torsionally rigid manner via the flange part (9), wherein the output side (6) is rotatably supported at the flange part (9) via a first bearing (10) arranged between the output side (6) and the flange part (9).

Description

TECHNICAL FIELD

[0001] The invention relates to a device comprising a pulley decoupler and a torsional vibration damper, which have a common axis of rotation. The pulley decoupler has an input side and an output side and at least one first spring element acting between the input side and the output side, by means of which the input side and the output side can be twisted relative to one another in the circumferential direction. The torsional vibration damper has a flange part. BACKGROUND

[0002] The pulley decoupler is designed, inter alia, for attaching a pulley at a drive machine, for example a crankshaft of a motor vehicle. Thereby, it should at least reduce or avoid the transmission of torsional vibrations, for example of the drive machine, to a belt driven by the pulley. However, the pulley decoupler can also constitute a dual-mass flywheel.

[0003] The torsional vibration damper is a torsional flexibility which is introduced into a drive train excited with periodic disturbances. The object here is to move the vibration resonances of the disturbances occurring in different operating situations into a rotational speed range which is as low as possible below the operating rotational speed. The vibration resonances remaining in the operating rotational speed range are damped via an external or integrated friction device, the friction torque of which should be within defined limits. In particular, the friction device can be constituted independently of the torsional flexibility and is therefore not taken into account in the following. In particular, the torsional flexibility together with the friction device is referred to in the following as a torsional vibration damper.

[0004] A device comprising a pulley decoupler and a torsional vibration damper having a common axis of rotation is known, for example, from EP 2 827 014 A1 and DE 10 2017 115 466 A1.

[0005] In DE 10 2017 115 466 A1 and EP 2 827 014 A1, the torsional vibration damper and the pulley decoupler are each provided at a hub. The output side is rotatably supported at the hub. Between the output side and the flange part of the torsional vibration damper, a spring element and a sealing element are provided.

[0006] There is a constant need to simplify components for motor vehicles, for example a device comprising a pulley decoupler and a torsional vibration damper, or to adapt them to particular application cases. SUMMARY

[0007] Starting from this, the object underlying the invention is to provide a device which is as simple as possible to construct, in particular comprising as few components as possible.

[0008] The object is achieved by means of an apparatus comprising a pulley decoupler and a torsional vibration damper, according to the application. Further advantageous design options of the application are explained in the embodiments. Features listed individually in the embodiments can be combined with one another in a technically meaningful manner and can define further design options of the application. Furthermore, features explained and set forth in the description, in which further preferred design options of the application are shown, are explained in the claims.

[0009] An apparatus comprising a pulley decoupler and a torsional vibration damper is proposed, the pulley decoupler and the torsional vibration damper having a common axis of rotation. The pulley decoupler has an input side and an output side and at least one first spring element acting between the input side and the output side, the input side and the output side being able to be twisted relative to one another in a circumferential direction against the spring action of the at least one first spring element. The torsional vibration damper has a flange part and is connected torsionally fixedly to the input side via the flange part. The output side is rotatably supported at the flange part via a first bearing arranged between the output side and the flange part.

[0010] In particular, the output side, also referred to as belt attachment region, since the output side can be connected torsionally fixedly to a belt via a belt section or the output side is connected torsionally fixedly to a belt via a belt section, can be twisted against the spring force of the at least one first spring element relative to the input side, also referred to as shaft attachment region, since the input side can be connected torsionally fixedly to a shaft, for example a crankshaft, or the input side is connected torsionally fixedly to a shaft, for example a crankshaft, for example over an angular range extending in the circumferential direction, for example up to 30 degrees, for example at most. The twisting is limited, for example, by a stop (first stop, second stop).

[0011] In particular, the at least one first spring element is supported at the first stop of the input side and at the second stop of the output side by means of the spring force acting in the circumferential direction.

[0012] In particular, torsional vibrations can be reduced at least via the relative twisting of the input side relative to the output side, which is effected against the spring force and, if necessary, against the damping action.

[0013] The first bearing serves in particular for supporting the output side at the flange part, wherein the output side and the flange part can be twisted relative to one another along the circumferential direction. The first bearing can in particular only enable a twisting of the output side relative to the flange part, wherein the first bearing preferably has no elastically deformable properties. The apparatus is designed in particular such that the output side is pressed against the flange part, for example via a spring force, wherein the position of the output side relative to the flange part is determined at least with respect to the radial direction and / or the axial direction by the first bearing, which is in particular not deformable.

[0014] In particular, the first bearing is a sliding bearing. In a sliding bearing, two components that move relative to each other (here, the flange component and the sliding bearing, and / or the output side and the sliding bearing) have direct contact with each other. The two components slide against each other against the resistance caused by sliding friction. Unlike rolling bearings, sliding bearings do not have rolling elements.

[0015] In particular, the output side is supported at the flange component at least in the radial direction via a first bearing.

[0016] In particular, the flange component has a section extending in the axial direction, at which a first bearing is disposed. In particular, the first bearing has a cylindrical shape and extends in both the circumferential direction and the axial direction (i.e., parallel to the axis of rotation).

[0017] In particular, the section is provided along the extension of the flange member between the attachment at the hub and the damper section, wherein a torsional damping device (i.e., a torsional flexible member, for example, together with a friction device) is provided in the damper section (of the torsional damper).

[0018] In particular, the output side is supported at the flange component at least in the axial direction by a first bearing.

[0019] In particular, the first bearing is implemented in two parts. The first part supports the output side at the flange member relative to the radial direction, and the second part supports the output side at the flange member relative to the axial direction. In particular, the two parts are arranged directly side by side with each other.

[0020] It extends in the axial direction, especially parallel to the axis of rotation.

[0021] Specifically, the output side includes a first cover section disposed axially between at least one first spring element and a flange member, wherein a first bearing is disposed at the first cover section. Specifically, the first cover section extends radially inward from the belt section on the output side.

[0022] In particular, the first cover section also extends along the axial direction and forms a mating surface, which is disposed opposite to a section of the flange component. In particular, a first bearing (or a first component of the first bearing) is disposed between the mating surface and the section.

[0023] In particular, the output side has a belt section and a second cover section extending radially inward from the belt section, wherein the second cover section is rotatably supported on the input side via a second bearing.

[0024] In particular, at least one first spring element is disposed axially between the first cover section and the second cover section. In particular, the first cover section, the belt section, and the second cover section form a housing for at least one first spring element. In particular, the housing may be at least partially filled with a fluid (lubricant, such as grease).

[0025] In particular, at least one first cover segment or one second cover segment, preferably both the first and second cover segments, has at least one second stop portion, which is used to support the spring force of at least one first spring element relative to the circumferential direction. In particular, the first stop portion on the input side is disposed between the first cover segment and the second cover segment along the axial direction.

[0026] Specifically, a second spring element is provided between the second cover section and the input side, and the output side is supported on the input side in the axial direction via the second spring element. In particular, the output side presses against the flange component via the second spring element.

[0027] In particular, the second spring element forms a second bearing, for example, together with the material constituting a sliding bearing. In particular, a friction ring is provided at least on the input side or the output side (preferably on both), the friction ring at least partially constituting the second bearing, through which the second spring element is torsionally disposed on the output side or the input side.

[0028] In particular, the second spring element can achieve a seal between the first spring element or the housing and the environment.

[0029] In particular, the second spring element extends around the axis of rotation at least along the circumferential direction. In particular, the second spring element is a disc spring.

[0030] In particular, the input side and flange components are torsionally connected to the hub, wherein the equipment can be torsionally mounted at the shaft via the hub.

[0031] The shaft is, for example, the crankshaft of a drive unit, such as an internal combustion engine. Specifically, the pulley decoupling is disposed axially between the torsional damper and the drive unit. In particular, the drive unit is disposed axially between the transmission mechanism and the device.

[0032] In particular, the device can be used in motor vehicles. Other components of the motor vehicle can be connected to the crankshaft via a belt of a pulley decoupling device, allowing the kinetic energy of the drive unit to be transferred to other components.

[0033] In particular, the use of indefinite articles (“ein”, “eine”, “einer”, and “eines”) in the patent claims and the reproduced specification should be understood as such rather than as numerals. Therefore, any terms or components introduced thereby should be understood to exist at least once, but in particular, may exist multiple times.

[0034] It should be noted beforehand that the numerals used herein (“first,” “second,” etc.) are primarily used (only) to distinguish multiple objects, variables, or processes of the same kind, and in particular, do not mandate the correlation and / or order of said objects, variables, or processes with respect to each other. If correlation and / or order are required, this is explicitly stated herein or will be apparent to those skilled in the art when examining the specifically described design. As long as a component can appear multiple times (“at least one”), the description of one component can be equally applied to all or some of the multiple components, but this is not mandatory. Attached Figure Description

[0035] The invention and its technical field are explained in detail below with reference to the accompanying drawings. It should be noted that the invention should not be limited to the listed embodiments. In particular, unless otherwise explicitly stated, certain aspects of the facts illustrated in the drawings can be extracted and combined with other components and knowledge of this specification. It should be particularly noted that the drawings and the dimensional relationships shown are merely schematic. The drawings show:

[0036] Figure 1 A cross-section of a first implementation variant of the known device is shown in the side view;

[0037] Figure 2 A cross-section of a second implementation variant of the known device is shown in the side view; and

[0038] Figure 3 A cross-sectional view of the device is shown in the side view. Detailed Implementation

[0039] Figure 1 The side view shows a cross-section of a first embodiment of a variant of device 1 known from EP 2 827 014 A1. The device includes a pulley decoupling 2 and a torsional damper 3 having a common axis of rotation 4. The pulley decoupling 2 has an input side 5 and an output side 6, and a first spring element 7 acting between the input side 5 and the output side 6, by which the input side 5 and the output side 6 can be torsional relative to each other in the circumferential direction 8. The torsional damper 3 has a flange component 9.

[0040] Figure 2A cross-section of a second embodiment of device 1, known from DE 10 2017 115 466 A1, is shown in the side view. (Refer to...) Figure 1 The implementation plan.

[0041] In DE 10 2017 115 466 A1 and EP 2 827 014 A1, the torsional damper 3 and the pulley decoupling device 2 are respectively located at the hub 15. The output side 6 is rotatably supported at the hub 15 via the first bearing 10. A second spring element 22 and a sealing element 26 or friction ring 31 are provided between the flange component 9 of the torsional damper 3 and the output side 6.

[0042] Figure 3 A cross-section of device 1 is shown in the side view. Device 1 includes a pulley decoupling device 2 and a torsional damper 3 having a common axis of rotation 4. The pulley decoupling device 2 has an input side 5 and an output side 6, and at least one first spring element 7 acting between the input side 5 and the output side 6. The input side 5 and the output side 6 can be torsional relative to each other in the circumferential direction 8 against the spring action of the at least one first spring element. The torsional damper 3 has a flange member 9 and is torsionally connected to the input side 5 via the flange member 9. The output side 6 is rotatably supported at the flange member 9 via a first bearing 10 disposed between the output side 6 and the flange member 9.

[0043] The output side 6 can resist the spring force of at least one first spring element 7 to twist relative to the input side 5. The twist is limited by stops (first stop 24, second stop 25).

[0044] At least one first spring element 7 is supported at a first stop 24 on the input side 5 and a second stop 25 on the output side 6 by means of a spring force acting in the circumferential direction 8.

[0045] The first bearing 10 supports the output side 6 against the flange component 9, wherein the output side 6 and the flange component 9 are torsion relative to each other in the circumferential direction 8. The first bearing 10 can only allow the output side 6 to torsion relative to the flange component 9, and the first bearing 10 is not elastically deformable. The device 1 is designed such that the output side 6 is pressed against the flange component 9 by the spring force of the second spring element 22, wherein the position of the output side 6 relative to the flange component 9 is determined by the indeformable first bearing 10 about the radial direction 11 and the axial direction 12.

[0046] The first bearing 10 is a sliding bearing. In a sliding bearing, two components that move relative to each other (here, flange component 9 and the sliding bearing, and output side 6 and the sliding bearing) are in direct contact with each other. The two components slide against each other against the resistance caused by sliding friction.

[0047] The output side 6 is supported on the flange component 9 by the first component 27 of the first bearing 10 relative to the radial direction 11.

[0048] The flange component 9 has a section 13 extending along the axial direction 12, at which a first bearing 10 is disposed. The first bearing 10 or the first component 27 of the first bearing 10 has a cylindrical shape and extends along the circumferential direction 8 and along the axial direction 12 (i.e., parallel to the axis of rotation 4).

[0049] Section 13 is provided between the attachment portion 14 at the hub 15 and the damper section 16 along the extension of the flange member 9, wherein a torsional damping device 17 (i.e., a torsional flexible member, for example, together with a friction device) is provided in the damper section 16 (of the torsional damper 2).

[0050] The output side 6 is also supported on the flange component 9 relative to the axial direction 12 via the first bearing 10 or the second component 28 of the first bearing 10.

[0051] The first bearing 10 is implemented in two parts. The first part 27 supports the output side 6 at the flange part 9 relative to the radial direction 11, and the second part 28 supports the output side 6 at the flange part 9 relative to the axial direction 12. The two parts are arranged directly side by side with each other.

[0052] The output side 6 includes a first cover section 18 disposed along an axial direction 12 between at least one first spring element 7 and a flange component 9, wherein a first bearing 10 is disposed at the first cover section 18. The first cover section 18 extends inwardly along a radial direction 11 from a belt section 19 of the output side 6. The first cover section 18 also extends along the axial direction 12 and forms a mating surface 29, which is disposed opposite to a section 13 of the flange component 9. A first bearing 10 (or a first component 27 of the first bearing 10) is disposed between the mating surface 29 and the section 13.

[0053] The output side 6 has a belt section 19 and a second cover section 20 extending inward from the belt section 19 along the radial direction 11, wherein the second cover section 20 is rotatably supported at the input side 5 via a second bearing 21.

[0054] At least one first spring element 7 is disposed along the axial direction 12 between the first cover section 18 and the second cover section 20. In particular, the first cover section 18, the belt section 19, and the second cover section 20 form a housing 30 for at least one first spring element 7. The housing 30 may be at least partially filled with a fluid (lubricant, such as grease).

[0055] In particular, the first cover section 18 and the second cover section 20 each have at least one second stop 25, which is used to support the spring force of at least one first spring element 7 relative to the circumferential direction 8. The first stop 24 of the input side 5 is disposed between the first cover section 18 and the second cover section 20 along the axial direction 12.

[0056] A second spring element 22 is provided between the second cover section 20 and the input side 5. The output side 6 is supported on the input side 5 relative to the axial direction 12 via the second spring element. The output side 6 presses against the flange component 9 via the second spring element 22.

[0057] Friction rings 31 are provided at the input side 5 and the output side 6. The friction rings together constitute the second bearing 21. The second spring element 22 is rotatably provided at the output side 6 and / or the input side 5 via the friction rings.

[0058] The second spring element 22, together with the friction ring 31 configured as a sealing element 26, can achieve a seal between the first spring element 7 or the housing 30 and the environment 32.

[0059] The second spring element 22 extends around the axis of rotation 4 along the circumferential direction 8. The second spring element 22 is a disc spring.

[0060] The input side 5 and the flange component 9 are torsionally connected to the hub 15 via the attachment part 14, wherein the device 1 is torsionally mounted on the shaft 23 via the hub 15.

[0061] List of reference numerals

[0062] 1 Equipment

[0063] 2. Belt pulley decoupling device

[0064] 3 Torsional vibration damper

[0065] 4. Rotation axis

[0066] 5. Input side

[0067] 6 Output side

[0068] 7 First Spring Element

[0069] 8. Circumferential direction

[0070] 9 Flange components

[0071] 10 First Bearing

[0072] 11 Radial direction

[0073] 12 Axial direction

[0074] 13 sections

[0075] 14. Attachment

[0076] 15 hubs

[0077] 16. Vibration damper section

[0078] 17 devices

[0079] 18 First Cover Section

[0080] 19. Belt section

[0081] 20 Second Cover Section

[0082] 21 Second Bearing

[0083] 22 Second Spring Element

[0084] 23 axis

[0085] 24 First stop section

[0086] 25 Second stop section

[0087] 26 Sealing elements

[0088] 27 First Component

[0089] 28 Second Component

[0090] 29 Stop surface

[0091] 30. Housing

[0092] 31 Friction Ring

[0093] 32 Environment

Claims

1. A device (1) comprising a pulley decoupling device (2) and a torsional damper (3), the pulley decoupling device and the torsional damper having a common axis of rotation (4), wherein the pulley decoupling device (2) has an input side (5) and an output side (6) and at least one first spring element (7) acting between the input side (5) and the output side (6), the input side (5) and the output side (6) being torsional relative to each other in a circumferential direction (8) against the spring action of the at least one first spring element; wherein the torsional damper (3) has a flange member (9) and is torsionally connected to the input side (5) via the flange member (9), wherein the output side (6) is rotatably supported at the flange member (9) via a first bearing (10) disposed between the output side (6) and the flange member (9).

2. The device (1) according to claim 1, wherein the first bearing (10) is a sliding bearing.

3. The device (1) according to claim 1, wherein the output side (6) is supported at the flange member (9) at least in the radial direction (11) via the first bearing (10).

4. The device (1) according to claim 3, wherein the flange component (9) has a section (13) extending along the axial direction (12), at which the first bearing (10) is disposed.

5. The device (1) according to claim 4, wherein the segment (13) is disposed along the extension of the flange member (9) between the attachment (14) at the hub (15) and the damper segment (16), wherein a torsional damping device (17) is provided in the damper segment (16).

6. The device (1) according to claim 1, wherein the output side (6) is supported at the flange member (9) at least relative to the axial direction (12) via the first bearing (10).

7. The device (1) according to any one of the preceding claims, wherein the output side (6) includes a first cover section (18) disposed along an axial direction (12) between the at least one first spring element (7) and the flange member (9), wherein the first bearing (10) is disposed at the first cover section (18).

8. The device (1) according to claim 7, wherein the output side (6) has a belt section (19) and a second cover section (20) extending inwardly in a radial direction (11) from the belt section (19), wherein the second cover section (20) is rotatably supported at the input side (5) via a second bearing (21).

9. The device (1) according to claim 8, wherein a second spring element (22) is provided between the second cover section (20) and the input side (5), and the output side (6) is supported on the input side (5) relative to the axial direction (12) via the second spring element.

10. The device (1) according to any one of claims 1-6, wherein the input side (5) and the flange component (9) are torsionally connected to the hub (15), wherein the device (1) can be torsionally disposed at the shaft (23) via the hub (15).

Images