Torsional vibration damper
By incorporating a centering region and an arc spring into the torsional vibration damper, the problems of friction control and structural compactness are solved, resulting in a lower-cost and more reliable torsional vibration damper design suitable for vehicle powertrain systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SCHAEFFLER TECHNOLOGIES AG & CO KG
- Filing Date
- 2022-04-11
- Publication Date
- 2026-06-05
AI Technical Summary
Existing torsional vibration dampers have shortcomings in friction control and structural compactness, resulting in high cost and low reliability.
A torsional vibration damper was designed. A centering region was set between the first and second damper components. The centering region has different gap distances at different circumferential positions to reduce friction and more accurately limit friction. A more stable centering effect is achieved by using an arc spring and a centering section.
This resulted in a lower-cost, more compact torsional vibration damper design, improved reliability, reduced friction, and enhanced structural stability and torque transmission capabilities.
Smart Images
Figure CN115199701B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a torsional vibration damper. Background Technology
[0002] For example, a torsional vibration damper is known from DE 10 2018 119 505 A1. It describes a torsional vibration damper having a primary component rotatable about a rotation axis, a secondary component torsionally relative to the primary component against the action of an arcuate spring, and a torque limiter. The torque limiter is formed on one hand by two axially spaced disc elements fixedly connected to each other and directly fastened to a driven hub, and on the other hand by a bearing flange engaging in a receiving channel of the axially limiting disc element and face-to-face abutting against the first disc element. A disc spring supported on the second disc element presses the support disc face-to-face against the bearing flange. At least one friction liner configured as a friction disc is provided between the bearing flange and the first disc element, and between the bearing flange and the support disc. The axially spaced disc elements are fastened together to the driven hub by riveting. The bearing flange is centered on the outer contour of the driven hub via its inner diameter. Summary of the Invention
[0003] The purpose of this invention is to implement torsional vibration dampers more robustly, at a lower cost, and in a more compact manner.
[0004] At least one of these objectives is achieved by a torsional vibration damper for reducing torsional vibration and for transmitting torque, the torsional vibration damper comprising: a first damper member rotatable about a rotational axis and connected to at least one spring element via a spring engagement mechanism in a torque-transmitting manner; and a second damper member rotatable relative to the first damper member, rotatable about the rotational axis and centerably accommodating the first damper member, wherein a centering region for radial centering exists between the first and second damper members, wherein the centering region has a first clearance distance at a first circumferential position and a second clearance distance at a second circumferential position offset circumferentially from the first circumferential position, the second clearance distance being greater than the first clearance distance. This reduces frictional forces during centering and allows for more precisely defined frictional forces. Torsional vibration can be better reduced. The reliability of the torsional vibration damper is improved. The torsional vibration damper can be constructed at a lower cost and with less structural space.
[0005] The centering region can exist radially between the inner circumference of the first damper component and the outer circumference of the second damper component. Alternatively, the centering region can exist between the outer circumference of the first damper component and the inner circumference of the second damper component. The centering region can be a radial centering gap.
[0006] Torsional vibration dampers can be installed in the powertrain of vehicles, especially motor vehicles. They can transmit torque supplied by drive elements such as internal combustion engines and / or electric motors. Torsional vibration dampers can be designed as dual-mass flywheels. Torque can be transmitted via a torque limiter connected downstream of the torsional vibration damper.
[0007] The spring element can be a helical spring. The spring element can also be a curved spring.
[0008] The first damper component can be an arc-shaped spring flange.
[0009] In a preferred embodiment of the invention, it is advantageous that the first circumferential position coincides with the spring engagement mechanism on the circumferential side. This allows for more precise centering and alignment of the spring engagement mechanism in the radial direction. Spring operation can be performed more accurately, and unwanted friction between the first damper member and the other component can be prevented.
[0010] A preferred embodiment of the invention is advantageous in which the second circumferential position is offset by 90° relative to the first circumferential position. Thus, the gap distance along the first radial axis corresponding to the first circumferential position in the centering region can be smaller than the gap distance along the second radial axis corresponding to the second circumferential position and perpendicular to the first radial axis.
[0011] In a preferred embodiment of the invention, it is advantageous to provide at least one first spring engagement mechanism and a second spring engagement mechanism offset circumferentially relative to the first spring engagement mechanism, with a first gap distance at a first circumferential position coinciding with the first spring engagement mechanism on the circumferential side and a third gap distance at a third circumferential position coinciding with the second spring engagement mechanism on the circumferential side, wherein the second gap distance is greater than the first and third gap distances. In the event of unequal tangential forces acting on the spring engagement mechanisms, a radial offset occurs between the first and second damper components along a second radial axis corresponding to the second circumferential position, which can be compensated for by the larger second gap distance. Conversely, the possible radial offset along the first radial axis corresponding to the first and third circumferential positions can be smaller. The first and second spring engagement mechanisms can be arranged radially opposite each other relative to the axis of rotation.
[0012] In a preferred embodiment of the invention, it is advantageous that the first gap distance and the third gap distance are equal. The first gap distance and the third gap distance may also be unequal.
[0013] A preferred embodiment of the invention is advantageous, wherein the first gap distance and the second gap distance are formed via a centering surface that is off-circular. The first damper member and / or the second damper member may preferably have a circumferential surface on the inner or outer diameter that forms a centering region and is off-circular.
[0014] A preferred embodiment of the invention is advantageous, wherein the first gap is formed via a centering segment defined on the circumferential side, the centering segment extending radially into the centering region. The centering segment may be a separate component from the first and second damper components. The centering segment may be integrally formed from the first and / or second damper components. The centering segment may have a centering surface matching the radially opposite damper components for centering. The centering surface may be rounded.
[0015] In a preferred embodiment of the invention, a first damper component is radially disposed outside a second damper component. A centering region may exist between the inner circumference of the first damper component and the outer circumference of the second damper component.
[0016] In a preferred embodiment of the invention, the torsional vibration damper includes a torque limiter having a torque limiter input and a torque limiter output connected to the torque limiter input via a pre-tensioned friction region, wherein a first damper member forms the torque limiter input. The friction region can be pre-tensioned by a spring element, such as a disc spring, and can transmit torque up to a limit torque.
[0017] The torque limiter input can be connected to the damper output, especially in an integrated configuration. The torque limiter output can be fixedly connected to the driven hub.
[0018] The friction region may include at least one friction liner. The friction liner may be located at the input and / or output of the torque limiter. The friction region may be radially positioned outside the centering region.
[0019] In one specific embodiment of the invention, it is advantageous that the second damper component is a torque limiter output or a component fixedly connected to the torque limiter output. The component may be a driven hub. The torque limiter output and the component may be riveted together.
[0020] Other advantages and advantageous designs of the present invention will become apparent from the accompanying drawings. Attached Figure Description
[0021] The present invention will now be described in detail with reference to the accompanying drawings. Details are shown below:
[0022] Figure 1 A half-section of a torsional vibration damper according to a specific embodiment of the present invention is shown.
[0023] Figure 2 A side view of the first and second damper components of a torsional vibration damper in their initial positions is shown.
[0024] Figure 3 A side view of a first damper component and a second damper component of a torsional vibration damper according to another specific embodiment of the present invention is shown.
[0025] Figure 4 A partial side view of a first damper component and a second damper component of a torsional vibration damper according to another specific embodiment of the present invention is shown.
[0026] Figure 5 A side view of the first damper component of a torsional vibration damper according to another specific embodiment of the present invention is shown.
[0027] Figure 6 A partial side view of a first damper component and a second damper component of a torsional vibration damper according to another specific embodiment of the present invention is shown. Detailed Implementation
[0028] Figure 1 A half-section of a torsional vibration damper 10 according to a specific embodiment of the present invention is shown. The torsional vibration damper 10 is implemented as a dual-mass flywheel 12 and disposed between a drive element, such as an internal combustion engine, and a driven element, such as a transmission, to reduce torsional vibration and transmit torque. The torsional vibration damper 10 includes a damper input end 16 rotatable about a rotation axis 14 and a damper output end 20 rotatable about the rotation axis 14 and torsionally restrained relative to the damper input end 16 against the action of at least one spring element 18, such as an arc spring.
[0029] Downstream of the torsional vibration damper 10 is a torque limiter 22 for limiting the transmittable torque. The torque limiter 22 has a torque limiter input terminal 24 and a torque limiter output terminal 28 that is frictionally engaged with the torque limiter input terminal via a pre-tightened friction region 26. The torque limiter output terminal 28 is connected to the driven hub 30.
[0030] The damper output end 20 is integrally implemented with the torque limiter input end 24 and serves as a first damper component 32, connected to at least one spring element 18 via a spring engagement mechanism 34 in a torque-transmitting manner. The first damper component 32 is torsional relative to a second damper component 36, which is formed via the torque limiter output end 28, and the first damper component is radially centered on the second damper component via a centering region 38. The first damper component 32 is radially disposed outside the second damper component 36.
[0031] Figure 2The diagram shows a side view of the first and second damper components 32, 36 of the torsional vibration damper 10 in their initial positions. The torsional vibration damper 10 includes two radially opposed spring engagement mechanisms 34 offset 180° circumferentially for loading two spring elements (not depicted here). The spring elements are implemented as arcuate springs.
[0032] For example, one arc spring may be longer than another arc spring by an angle D in the circumferential direction. When the arc spring lengths are unequal or the tolerances are unfavorable, the first damper member 32 can be moved by an offset d relative to the second damper member 36 during the operation of the torsional vibration damper 10, which loads the spring element, causing the spring element to be compressed. The offset d can compensate for the centering gap in the centering region 38 and result in contact between the first and second damper members 32, 36.
[0033] The contact between the first and second damper components 32 and 36 and the displacement force F acting perpendicularly thereon cause additional friction in the torsional vibration damper 10, which is related to the component tolerances and is difficult to estimate in advance.
[0034] Figure 3 The diagram shows a side view of the first and second damper members 32, 36 of a torsional vibration damper 10 according to another specific embodiment of the invention. The first damper member 32 is radially disposed outside the second damper member 36 and radially centered on the second damper member 36 via a centering region 38. At a first circumferential position 40 coinciding with the spring engagement mechanism 34 on the circumferential side, the centering region 38 has a first gap distance 42. At a second circumferential position 44 offset 90° from the first circumferential position 40 on the circumferential side, the centering region 38 has a second gap distance 46 greater than the first gap distance 42. Thus, the displacement force F described above can induce a small frictional force or no frictional force between the first and second damper members 32, 36. The centering distance in the centering region 38 along the first radial axis 48 corresponding to the first circumferential position 40 is smaller than the centering distance along the second radial axis 50 corresponding to the second circumferential position 44.
[0035] A first gap distance 42 exists at the first circumferential position, and a third gap distance 54 exists at the third circumferential position 52, which coincides with the second spring engagement mechanism 34 on the circumferential side, wherein the second gap distance 46 is greater than the first and third gap distances 42 and 54. The first and third gap distances 42 and 54 are preferably equal.
[0036] When the tangential forces acting on the spring engagement mechanism 34 and causing the displacement force F are unequal, the radial offset between the first and second damper members 32, 36 along the second radial axis 50 can be compensated by a larger second gap distance 46. Conversely, the possible radial offset along the first radial axis 48 can be smaller, thereby allowing for more precise radial fixation of the spring engagement mechanism 34.
[0037] Figure 4 Partial side view of the first and second damper members 32, 36 of a torsional vibration damper 10 according to another specific embodiment of the invention is shown. A first gap distance 42 and a second gap distance 46 are formed via an off-circular circumferential surface 56 on the inner diameter of the first damper member 32. In the region of the first gap distance 42, the circumferential surface 56 of the first damper member 32 may have a flat centering segment 58 extending tangentially to a first radial axis 48. The first gap distance 42 is preferably zero.
[0038] Figure 5 A side view of the first damper component 32 of a torsional vibration damper 10 according to another specific embodiment of the invention is shown. A first clearance distance 42 is formed via a centering segment 58 defined on the circumferential side, the centering segment extending radially into the centering region 38. The centering segment 58 is preferably implemented as a separate component or integrally with the first damper component 32. (See also...) Figure 6 As shown, the centering section 58 on the first damper member 32 preferably has a rounded centering surface 60 that matches the radially opposite second damper member.
[0039] List of reference numerals
[0040] 10 Torsional vibration dampers
[0041] 12 Dual-mass flywheel
[0042] 14. Axis of rotation
[0043] 16. Shock absorber input end
[0044] 18 Spring elements
[0045] 20. Vibration damper output end
[0046] 22 Torque limiter
[0047] 24 Torque limiter input terminal
[0048] 26 Friction Area
[0049] 28 Torque limiter output terminal
[0050] 30 Driven hub
[0051] 32 First vibration damper component
[0052] 34 Spring engagement mechanism
[0053] 36 Second vibration damper components
[0054] 38. Centering Zone
[0055] 40 First circumferential position
[0056] 42 First gap distance
[0057] 44 Second circumferential position
[0058] 46 Second gap distance
[0059] 48 First radial axis
[0060] 50 Second radial axis
[0061] 52 Third Ring Position
[0062] 54 Third gap distance
[0063] 56 Circumferential surface
[0064] 58. Focusing Section
[0065] 60. Calm Noodles
Claims
1. A torsional vibration damper (10) for reducing torsional vibration and for transmitting torque, said torsional vibration damper having: A first damper component (32), which is rotatable about a rotation axis (14) and connected to at least one spring element (18) via a spring engagement mechanism (34) in a torque-transmitting manner; and a second damper component (36), which is torsional relative to the first damper component (32), rotatable about the rotation axis (14), and centerably accommodates the first damper component (32), wherein a centering region (38) for radial centering exists between the first damper component (32) and the second damper component (36). Its features are, The centering region (38) has a first gap distance (42) at a first circumferential position (40) and a second gap distance (46) at a second circumferential position (44) offset from the first circumferential position (40) on the circumferential side, the second gap distance being greater than the first gap distance (42).
2. The torsional vibration damper (10) according to claim 1, characterized in that, The first circumferential position (40) coincides with the spring engagement mechanism (34) on the circumferential side.
3. The torsional vibration damper (10) according to claim 1, characterized in that, The second circumferential position (44) is offset by 90° relative to the first circumferential position (40).
4. The torsional vibration damper (10) according to any one of the preceding claims, characterized in that, The device is provided with at least one first spring engagement mechanism and a second spring engagement mechanism offset on the circumferential side relative to the first spring engagement mechanism, and has a first gap distance (42) at a first circumferential position (40) coinciding with the first spring engagement mechanism on the circumferential side and a third gap distance (54) at a third circumferential position (52) coinciding with the second spring engagement mechanism on the circumferential side, wherein the second gap distance (46) is greater than the first gap distance (42) and the third gap distance (54).
5. The torsional vibration damper (10) according to claim 4, characterized in that, The first gap distance (42) and the third gap distance (54) are equal.
6. The torsional vibration damper (10) according to claim 4, characterized in that, The first gap distance (42) and the second gap distance (46) are formed via a centering surface that deviates from a circle.
7. The torsional vibration damper (10) according to claim 4, characterized in that, The first gap distance (42) is formed via a centering section (58) that is circumferentially bounded and extends radially into the centering region (38).
8. The torsional vibration damper (10) according to claim 1, characterized in that, The first damper component (32) is radially disposed outside the second damper component (36).
9. The torsional vibration damper (10) according to claim 1, characterized in that, The torsional vibration damper (10) has a torque limiter (22) having a torque limiter input (24) and a torque limiter output (28) connected to the torque limiter input via a pre-tightened friction area (26), wherein the first damper member (32) forms the torque limiter input (24).
10. The torsional vibration damper (10) according to claim 9, characterized in that, The second damper component (36) is the output end (28) of the torque limiter or a component fixedly connected to the output end of the torque limiter.