centrifugal pendulum device
By employing a stepped roller element and a reduced transition radius in guide tracks, the centrifugal pendulum device addresses issues of spring overloading and breakage, ensuring stable and controlled movement of centrifugal weights.
Patent Information
- Application Number
- DE102016221216
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2016-10-27
- Publication Date
- 2025-05-08
- Estimated Expiration
- 2036-10-27
AI Technical Summary
Existing centrifugal pendulum devices face issues with excessive loading of springs during dynamic movements, leading to potential spring breakage, due to uncontrolled movement of centrifugal weights caused by play in guide tracks.
The design features a stepped roller element with different radii for engaging with guide tracks of centrifugal weights and flanges, and a transition radius in guide tracks that is smaller than the roller element's radius, creating defined stop points to prevent uncontrolled movement.
This solution effectively prevents uncontrolled springback and rotational movement of centrifugal weights, ensuring stable and orderly movement, thereby reducing the risk of spring breakage and improving the device's operational reliability.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
[0001] The invention relates to a centrifugal pendulum device, in particular for the drive train of a motor vehicle.
[0002] Centrifugal pendulum-type devices are used to absorb torsional vibrations, for example, in the drivetrain of a motor vehicle. They are also referred to as torsional vibration absorbers or torsional vibration dampers, or they are part of such a torsional vibration absorber or torsional vibration damper. Centrifugal pendulum-type devices have become known that form a structural unit with a single-mass flywheel or a dual-mass flywheel to dampen torsional vibrations in the drivetrain of a motor vehicle. The centrifugal pendulum-type devices known in the prior art either have a flange and centrifugal weights arranged on either side as pendulum masses, or alternatively, they have two flanges arranged at a distance from one another and centrifugal weights arranged between them.The individual flange or both flanges are directly or indirectly connected to an element of the drive train, so that it or they are driven. As a result, the centrifugal weights move in the centrifugal force field of the rotational movement relative to the at least one rotating flange.
[0003] The flyweights in centrifugal pendulum devices can swing freely. In alternative centrifugal pendulum devices, adjacent flyweights are elastically coupled, so that the flyweights are synchronized with each other. This elastic coupling allows for a certain degree of non-symmetrical swing. Such centrifugal pendulum devices are also referred to as spring-coupled centrifugal pendulum devices.
[0004] The centrifugal weights are guided displaceably relative to at least one flange by means of roller elements which engage in guideways of the respective centrifugal weight and the respective flange. The guideways in the flange and centrifugal weight are each suitably curved and have an area referred to as the running surface, on which the roller element rolls or runs along. The guideways also have an end stop at their two opposite ends, against which the roller element can strike when the maximum oscillation angle of the centrifugal weight is reached. The running surface at both ends transitions into the end stop via a respective transition radius, wherein the transition radius is at least as large as the radius of the rolling roller element.
[0005] In spring-coupled centrifugal pendulum absorbers, very dynamic movements of the flyweights can occur during a start-stop operation of the vehicle engine, resulting in significant radial misalignment of the adjacent flyweights. This can place excessive bending stress on the springs arranged and connected between the adjacent flyweights, which could lead to spring breakage.
[0006] The reason for this is that there is play in the guideways towards the roller elements to compensate for manufacturing tolerances. In a start-stop operating situation, the rollers do not run in the tracks on the running surfaces, but rather move freely within the available space of the guideways. This allows the centrifugal weights to move more or less uncontrollably, sometimes even beyond the space normally required for the pure pendulum movement. In unfavorable, highly dynamic operating points of the centrifugal pendulum-absorbing device, a large radial offset can occur between the adjacent centrifugal weights, placing severe stress on the springs between them, which could even lead to their destruction.
[0007] DE 10 2016 206 500 A1 discloses a centrifugal pendulum device of the type referred to as a damper system, in which the transition radius of the guideways of the centrifugal weights between the running surface and an end stop is smaller than the radius of the roller element with which the respective roller element is supported in the guideway of the respective centrifugal weight.
[0008] DE 198 31 158 A1 discloses another centrifugal pendulum device in which the transition radius of the guideways of the flange between the running surface and an end stop is smaller than the radius of the roller element with which the respective roller element is supported in a guideway of the flange.
[0009] It is the object of the present invention to provide a centrifugal pendulum device which is simple and cost-effective to manufacture and at the same time is improved compared to the prior art.
[0010] The problem of the centrifugal pendulum device is solved with the features of claim 1.
[0011] According to the invention, the roller element is of stepped design and has at least a first region that engages in a guideway of a centrifugal weight and at least a second region that engages in a guideway of a flange, wherein the radius of the roller element in the first region is greater or smaller than the radius of the roller element in the second region. Furthermore, the transition radius of the guideway of a centrifugal weight between the running surface and an end stop is greater or smaller than the transition radius of the guideway of a flange between the running surface and an end stop. This enables a secure arrangement of the roller element in the arrangement of flange and centrifugal weight to be achieved.
[0012] An embodiment of the invention relates to a centrifugal pendulum device with at least one flange and with a plurality of centrifugal weights as pendulum masses, which are mounted in a displaceably guided manner on the at least one flange by means of at least one roller element, wherein the respective roller element engages in a guide track of at least one of the centrifugal weights and of at least one of the flanges in order to guide the displaceability of the respective centrifugal weight relative to the at least one flange, wherein the roller element is supported on the guide track of the centrifugal weight and on the guide track of the at least one flange,wherein the at least one guideway of the flyweight and / or the flange has a region as a running surface for the roller element, and the guideway has an end stop for the roller element at each of its two opposite ends, and wherein the running surface transitions into the end stop at the two ends by means of a respective transition radius, wherein the transition radius of the guideway of the flange and / or flyweight between the running surface and an end stop is smaller than the radius of the roller element with which the roller element is supported in the guideway.
[0013] By reducing the transition radius, two clear stop points are created for the roller element on a guideway of a flange and / or a centrifugal weight, advantageously two clear stop points on the guideway of the centrifugal weight and two clear stop points on the guideway of the flange. Firstly, this has the advantageous effect that, during the highly dynamic movements of the centrifugal weights described above, the roller elements no longer hit the transition radius, which would lead to the uncontrolled recoil of the roller element and thus to the twisting of the centrifugal weight. Rather, the proposed, more precisely defined stop geometry enables an orderly recoil to be achieved without triggering a rotational movement of the centrifugal weight. Secondly, the roller element is forced into a stable, clearly defined position in its end position.This essentially wedges the roller element into the end position, preventing the centrifugal weights from rotating even in the end position. This can also result in a wedge-like contour of the guideway, which ensures that the roller element stops at the end stop at only two points.
[0014] According to one concept of the invention, it is also advantageous if the transition radius of the guideway of the flange and / or flyweight between the running surface and an end stop is smaller than half the radius of the roller element with which the roller element is supported in the guideway. This can result in an even more wedge-like contour of the guideway, which ensures a defined contact of the roller element with the end stop at only two contact points.
[0015] According to a further concept of the invention, it is advantageous if the guide track of a centrifugal weight is designed to be openly curved radially outward, so that a center of curvature of the guide track would lie radially outside the guide track. This achieves an advantageous movement path of the centrifugal weight.
[0016] It is also advantageous if the running surface of a guideway of a centrifugal weight is arranged radially inward on the guideway.
[0017] Furthermore, it is advantageous if the transition radius of a flyweight's guideway between the running surface and an end stop is located radially inside the guideway. This clearly defines the stop points.
[0018] It is also advantageous if the guideway of a flange is designed to be openly curved radially inward, so that the center of curvature of the guideway lies radially inside the guideway. This also achieves a favorable movement path for the centrifugal weight.
[0019] Furthermore, it is expedient if the running surface of a guideway of a flange is arranged radially outside on the guideway.
[0020] In another embodiment, it is also advantageous if the transition radius of a flange guideway between the running surface and an end stop is arranged radially on the outside of the guideway. This again achieves defined stop points.
[0021] The present invention is explained in more detail below using preferred embodiments in conjunction with the accompanying figures:
[0022] Showing: Fig. 1 a schematic perspective partial view of a centrifugal pendulum device, Fig. 2 a schematic representation of an alternative centrifugal pendulum device in section, Fig. 3 a representation of a flyweight in different positions, Fig. 4 a representation of two end regions of flyweights which are coupled to each other at the end by means of a spring, Fig. 5 a representation of a flyweight with roller elements, and Fig. 6 a representation of a guideway of a centrifugal weight and a guideway of a flange with a roller element arranged therein.
[0023] The Fig. 1 shows a perspective partial view of a centrifugal pendulum device 10 for the general explanation of a centrifugal pendulum device 10. The centrifugal pendulum device 10 has a centrally arranged flange 11. The flange 11 can, for example, be attached radially inward to an element of the drive train of a motor vehicle in order to dampen or eliminate torsional vibrations in the drive train of a motor vehicle. For this purpose, the flange 11 has, for example, a radially inward annular region 12 in which fastening openings 13 are provided for connection, such as riveting. In the exemplary embodiment of the Fig. 1, the flange 11 is flat. Alternatively, the flange 11 can also be potted, for example. The flange 11 can also be arranged or connected in other ways to dampen vibrations. At least one first centrifugal weight 15 and one second centrifugal weight 16 are arranged on both sides of the flange 11. These centrifugal weights 15, 16 are ring-segment-shaped and each have guideways 17 in which roller elements 18 are received. The flange 11 also has corresponding guideways 19, each of which accommodates a roller element 18.
[0024] The roller element 18 has a central region 20 and two end regions 21. The flange 11 with its first guide track 19 accommodates the roller element 18 with its central region 20, with the flyweights 15, 16 receiving the roller element 18 in their guide tracks 17 at the end regions 21.
[0025] The central region 20 of the roller element 18 can optionally have a larger diameter than the diameters of the end regions 21. Between the central region and the end regions, the roller element 18 optionally also has radially outwardly projecting, circumferential webs 22, which can serve to center the roller element 18 relative to the flange 11.
[0026] The flyweights 15, 16, with their guideways 17, are designed in such a way that the guideways 17 are dimensioned to accommodate the end regions 21 with their diameter. Two flyweights 15, 16 are connected to one another by means of connecting elements 23, which are designed as rivet elements. The respective connecting element 23 extends through a recess in the flange 11, so that the flyweights 15, 16 are arranged so that they can be displaced relative to the flange 11.
[0027] The Fig. 2 shows a sectional view of another embodiment of a centrifugal pendulum device 50 with two arranged flanges 51, which are arranged radially outwardly parallel to one another and extend radially inwardly in an S-shape where they can be connected to one another. A flyweight 53 is arranged axially between the two flanges 51. This flyweight is constructed in two parts and consists of interconnected discs 52. Both the flanges 51 and the flyweight 53 have guide tracks 54, 55 through which a roller element 56 engages. The roller element 56 has running surfaces 58, 59, which are formed radially outwardly on the body 60 of the roller element 56 and on which the roller element 56 is supported on the guide tracks 54, 55. Rivet elements can also be provided which connect the discs 52 of the flyweight to one another.The roller element 56 can optionally be designed such that the running surfaces 58, 59 do not have the same diameter, and the adjacent running surfaces 58, 59 are separated from each other by a circumferential shoulder 62 or by a radially outwardly projecting circumferential web. Alternatively, the roller elements can also be designed differently.
[0028] In the examples of Fig. 1 and Fig. 2, the supporting areas of the roller elements 18, 56 are each cylindrical and the edges of the guideways are flat, so that the respective roller element 18, 56 rests against the respective guideway over the width of the flange or the centrifugal weight.
[0029] It can also be seen that the respective flange 11, 51 is formed from only one disc element. The flyweight 15 and the flyweight 16 are also each formed from only one disc element. The flyweight 53 of the Fig. 2 is formed from three disc elements 52. Numerous variations are possible for the construction of the flyweight and flange.
[0030] A centrifugal pendulum device according to the invention is provided with at least one flange 11, 51 and with a plurality of centrifugal weights 15, 16, 53 as pendulum masses, which are mounted displaceably guided on the at least one flange 11, 51 by means of roller elements 18, 56, wherein the respective roller element 18, 56 engages in at least one guide track 17, 19, 54, 55 of at least one of the centrifugal weights 15, 16, 53 and / or of at least one of the flanges 11, 51 in order to guide the displaceability of the respective centrifugal weight 15, 16, 53 relative to the at least one flange 11, 51, wherein the roller element 18, 56 has at least one support area on which a guide track 17, 19, 54, 55 of a centrifugal weight 15, 16 or of a flange 11, 51.
[0031] The Fig. Figure 3 shows a flyweight 100 that is mounted in a movable manner in the centrifugal pendulum device. In special operating situations, such as a start-stop situation, the flyweight 100 can move freely within the available space because the roller elements do not roll in the guideways, but rather lift off the running surfaces. This allows the flyweights 100 to move more or less uncontrolled. Fig. 3 with the contour 101 a position of a flyweight 100 in such a free movement.
[0032] If the flyweights are coupled to a neighboring flyweight at each end, this can lead to strong undesirable loads on the coupling spring. Fig. Figure 4 shows the end region 110, 111 of two adjacent flyweights 112, 113, which are coupled together by a spring 114. If the deflection of the flyweights 112, 113 is greater than intended during normal operation, the spring 114 may be subjected to excessive stress and possibly damaged.
[0033] The Fig. Figure 5 shows a flyweight 150 with guideways 151, 152. A roller element 153, 154 engages each of the guideways 151, 152. The guideways 151, 152 are designed such that they have a running surface 155 and an end stop 156, 157 at each end. The running surfaces 155 transition into the respective end stop 156, 157 by means of a transition radius 158, 159.
[0034] In Fig. 5, the transition radius 158, 159 is smaller than the radius of the roller element 153, 154. This creates two stop points 160, 161 for the roller element 153, 154 on the guide track 151, 152.
[0035] Preferably, the transition radius 158, 159 is smaller than half the radius of the roller element 153, 154. This clearly defines the stop points 160, 161, and between the stop points 160, 161 lies an area of the guideway 151, 152 that is not touched by the roller element 153, 154. This creates a clear two-point contact between the guideway at the end stop and the roller element.
[0036] The Fig. 6 schematically shows a flyweight 200 and a flange 250, each with a guideway 201, 251. The guideways of flange 250 and flyweight are positioned relative to each other such that a roller element 202 engages in both guideways 201, 251.
[0037] The guideways 201, 251 are designed such that they have a running surface 203, 253 and, at each end, an end stop 204, 205 or 254, 255. The running surfaces 203, 253 transition into the respective end stop 204, 205, 254, 255 by means of a transition radius 206, 207 or 256, 257.
[0038] In Fig. 6, the respective transition radius 206, 207, 256, 257 is smaller than the radius of the roller element 202. The roller element 202 can have different diameters or radii for the flange 250 or for the flyweight 200, so that the transition radius 206, 207, 256, 257 of the flange and the flyweight 250, 200 can also be different.
[0039] In Fig.6, radius R1 is the radius of the roller element 202 in the area of the flyweight 200. Radius R2 is the radius of the roller element 202 in the area of the flange 250. In this example, R1 is greater than R2. Alternatively, R1 can be equal to or less than R2.
[0040] The illustrated guideways 201, 251 with their transition radii 206, 207, 256, 257 create stop points 220, 221, 260, 261 for the roller element 202.
[0041] The respective transition radius 206, 207, 256, 257 is smaller than the respective radius of the roller element 202. The resulting stop points 220, 221, 260, 261 ensure a clear two-point contact between the respective guideway 201, 251 at the end stop and the roller element 202. List of reference symbols 10 Centrifugal pendulum device 11 Flange 12 ring area 13 mounting holes 15 centrifugal weight 16 Flyweight 17 guideways 18 role elements 19 guideways 20 middle range 21 End area 22 jetty 23 fasteners 50 Centrifugal pendulum device 51 flange 52 disc 53 centrifugal weight 54 guideway 55 guideway 56 roller element 58 tread 59 Tread 60 bodies 62 paragraph 100 roller elements 101 load-bearing area 110 End area 111 End area 112 centrifugal weight 113 Flyweight 114 spring 150 centrifugal weight 151 guideway 152 guideway 153 roller element 154 roller element 155 tread 156 End stop 157 End stop 158 Transition radius 159 Transition radius 160 anchor point 161 anchor point 200 centrifugal weight 201 guideway 202 roller element 203 Tread 204 End stop 205 End stop 206 Transition radius 207 Transition radius 220 anchor points 221 anchor points 250 flange 251 guideway 253 tread 254 End stop 255 End stop 256 transition radius 257 Transition radius 260 anchor points 261 anchor points
Claims
[1] Centrifugal pendulum device (10, 50) with at least one flange (11, 51, 250) and with a plurality of centrifugal weights (15, 16, 53, 112, 113, 150, 200) as pendulum masses, which are displaceably guided by means of at least one roller element (18, 56, 100, 153, 154, 202) on the at least one flange (11, 51, 250), wherein the respective roller element (18, 56, 100, 153, 154, 202) is guided into a guide track (17, 19, 54, 55, 151, 152, 201, 251) of at least one of the centrifugal weights (15, 16, 53, 112, 113, 150, 200) and at least one of the flanges (11, 51, 250) engages in order to guide the displaceability of the respective centrifugal weight (15, 16, 53, 112, 113, 150, 200) relative to the at least one flange (11, 51, 250), wherein the roller element (18, 56, 100, 153, 154, 202) is located on the guide track (17, 19, 54, 55, 151, 152, 201, 251) of the centrifugal weight (15, 16, 53, 112, 113, 150, 200) and on the guide track (17, 19, 54, 55, 151, 152, 201, 251) of the at least one flange (11,51, 250), wherein the at least one guide track (17, 19, 54, 55, 151, 152, 201, 251) of the flyweight (15, 16, 53, 112, 113, 150, 200) and / or of the flange (11, 51, 250) has a region as a running surface (58, 59, 155, 203, 253) for the roller element (18, 56, 100, 153, 154, 202) and the guide track (17, 19, 54, 55, 151, 152, 201, 251) has an end stop (204, 205, 254, 255) for the roller element (18, 56, 100, 153, 154, 202) and wherein the running surface (58, 59, 155, 203, 253) at the two ends by a respective transition radius (158, 159, 206, 207, 256, 257) into the end stop (204, 205, 254, 255), wherein the transition radius (158, 159, 206, 207, 256, 257) of the guide track (17, 19, 54, 55, 151, 152, 201, 251) of the flange (11, 51, 250) and / or flyweight (15, 16, 53, 112, 113, 150, 200) between the running surface (58, 59, 155, 203, 253) and an end stop (204, 205, 254,255) is smaller than the radius of the roller element (18, 56, 100, 153, 154, 202) with which the roller element (18, 56, 100, 153, 154, 202) is supported in the guideway (17, 19, 54, 55, 151, 152, 201, 251), , characterized bythat the roller element (18, 56, 100, 153, 154, 202) is stepped and has at least a first region which engages in a guide track (17, 19, 54, 55, 151, 152, 201, 251) of a flyweight (15, 16, 53, 112, 113, 150, 200) and at least a second region which engages in a guide track (17, 19, 54, 55, 151, 152, 201, 251) of a flange (11, 51, 250), wherein the radius of the roller element (18, 56, 100, 153, 154, 202) in the first region is larger or smaller than the radius of the Roller element (18, 56, 100, 153, 154, 202) in the second area and that the transition radius (158, 159, 206, 207, 256, 257) of the guideway (17, 19, 54, 55, 151, 152, 201, 251) of a flyweight (15, 16, 53, 112, 113, 150, 200) between the running surface (58, 59, 155, 203, 253) and an end stop (204, 205, 254, 255) is greater or smaller than the transition radius (158, 159, 206, 207, 256, 257) of the guideway (17, 19, 54, 55, 151, 152, 201,251) by a flange (11, 51, 250) between the running surface (58, 59, 155, 203, 253) and an end stop (204, 205, 254, 255)., [2] Centrifugal pendulum device (10, 50) according to claim 1, characterized by that the transition radius (158, 159, 206, 207, 256, 257) of the guideway (17, 19, 54, 55, 151, 152, 201, 251) of the flange (11, 51, 250) and / or flyweight (15, 16, 53, 112, 113, 150, 200) between the running surface (58, 59, 155, 203, 253) and an end stop (204, 205, 254, 255) is smaller than half the radius of the roller element (18, 56, 100, 153, 154, 202) with which the roller element (18, 56, 100, 153, 154, 202) in the guideway (17, 19, 54, 55, 151, 152, 201, 251). [3] Centrifugal pendulum device (10, 50) according to one of the preceding claims, characterized bythat the guideway (17, 19, 54, 55, 151, 152, 201, 251) of a centrifugal weight (15, 16, 53, 112, 113, 150, 200) is curved radially outwards so that a center of curvature of the guideway (17, 19, 54, 55, 151, 152, 201, 251) would lie radially outside the guideway (17, 19, 54, 55, 151, 152, 201, 251). [4] Centrifugal pendulum device (10, 50) according to one of the preceding claims, characterized by that the running surface (58, 59, 155, 203, 253) of a guide track (17, 19, 54, 55, 151, 152, 201, 251) of a centrifugal weight (15, 16, 53, 112, 113, 150, 200) is arranged radially inward on the guide track (17, 19, 54, 55, 151, 152, 201, 251). [5] Centrifugal pendulum device (10, 50) according to one of the preceding claims, characterized bythat the transition radius (158, 159, 206, 207, 256, 257) of a guideway (17, 19, 54, 55, 151, 152, 201, 251) of a flyweight (15, 16, 53, 112, 113, 150, 200) between the running surface (58, 59, 155, 203, 253) and an end stop (204, 205, 254, 255) is arranged radially inward on the guideway (17, 19, 54, 55, 151, 152, 201, 251). [6] Centrifugal pendulum device (10, 50) according to one of the preceding claims, characterized by that the guideway (17, 19, 54, 55, 151, 152, 201, 251) of a flange (11, 51, 250) is curved open radially inwards, so that a center of curvature of the guideway (17, 19, 54, 55, 151, 152, 201, 251) would lie radially inside the guideway (17, 19, 54, 55, 151, 152, 201, 251). [7] Centrifugal pendulum device (10, 50) according to one of the preceding claims, characterized bythat the running surface (58, 59, 155, 203, 253) of a guide track (17, 19, 54, 55, 151, 152, 201, 251) of a flange (11, 51, 250) is arranged radially outwardly on the guide track (17, 19, 54, 55, 151, 152, 201, 251). [8] Centrifugal pendulum device (10, 50) according to one of the preceding claims, characterized by that the transition radius of a guideway (17, 19, 54, 55, 151, 152, 201, 251) of a flange (11, 51, 250) between the running surface (58, 59, 155, 203, 253) and an end stop (204, 205, 254, 255) is arranged radially on the outside of the guideway (17, 19, 54, 55, 151, 152, 201, 251).
Citation Information
Patent Citations
Tilting system
DE102016206500A1
Flywheel e.g. for road vehicle, with torsional vibration damper
DE19831158A1