Torsional vibration damper

Abstract

Torsional vibration damper (201) with an input part (202) and with an output part (203), wherein the input part (202) is arranged to be rotatable relative to the output part (203), with a damping device in the torque flow between the input part (202) and the output part (203), wherein a slip clutch (213) is further arranged as a torque limiter in the torque flow between the input part (202) and the output part (203), wherein the slip clutch (213) has a first input element and a first output element which are frictionally connected relative to each other, wherein the first output element has a toothing (240) into which a mating toothing (241) of the output part (203) engages, wherein a force storage device (242) axially acts the output part (203) with its mating toothing (241) into the toothing (240) of the first output element, characterized in thatthat the first output element has a first disk (215) and a second disk (214) arranged radially inside adjacent to each other, wherein the first disk (215) forms the toothing (240) and the second disk (214) serves as an axial stop (210) for the output part (203).

Description

[0001] The invention relates to a torsional vibration damper for the drive train of a motor vehicle.

[0002] Torsional vibration dampers, also simply called dampers, are known in many forms in the prior art, for example as dual-mass flywheels or clutch dampers. In modern DHT hybrid applications, limiting the transmissible torque of the torsional vibration damper is a recurring issue for vehicle manufacturers, as torque peaks should not be transmitted to the drivetrain downstream of the torsional vibration damper. Slip clutches are used as torque limiters for this purpose.

[0003] Such slip clutches as torque limiters are known in dual-clutch dampers and dual-mass flywheels as torsional vibration dampers, in the form of wet slip clutches lubricated in an oil bath or otherwise. Torque limiters with dry linings, bolted to a centrifugal pendulum device, are also known; see, for example, the DE 10 2019 111 161 A1.

[0004] The closest known state of the art is described in DE 10 2016 207 708 A1. A torsional vibration damper designed as a dual-mass flywheel is equipped with a slip clutch as a torque limiter. In such torsional vibration dampers, the input part is typically bolted to the drive side. The bolts are not only inserted through the bolt holes of the input part, but are also guided through openings, such as through-holes, in a disc component, such as an output hub, which is connected to the output part of the slip clutch. During initial assembly, the bolt holes of the input part and the openings of the disc component align, allowing the bolts to be inserted and the input part to be bolted to a drive shaft.In this installation situation, the torsional vibration damper can also be removed again if necessary, because the screws are easily accessible.

[0005] However, if the slip clutch acts as a torque limiter and the disc element twists relative to the input part due to exceeding a set torque, the openings no longer align with the screw holes and disassembly of the torsional vibration damper is no longer possible.

[0006] The object of the present invention is to create a torsional vibration damper which has a slip clutch as a torque limiter, in which disassembly and reassembly are possible even after the slip clutch of the torque limiter has been triggered, and without the need for specific tools.

[0007] The problem is solved using the features of claim 1.

[0008] The invention relates to a torsional vibration damper with an input part and an output part, wherein the input part is rotatably arranged relative to the output part, with a damping device in the torque flow between the input part and the output part, wherein a slip clutch is further arranged as a torque limiter in the torque flow between the input part and the output part, wherein the slip clutch has a first input element and a first output element which are frictionally connected relative to each other, wherein the first output element has a toothing into which a mating toothing of the output part engages, wherein a force storage device axially acts on the output part with its mating toothing into the toothing of the first output element.This ensures that, in the event of axial displacement, the output part with its mating teeth can be pulled out of the teeth of the first output element, allowing the output part to be rotated relative to the input part again. This enables the openings in the output part to be aligned with the screw holes in the input part once more. This, in turn, allows the torsional vibration damper to be disassembled even after the slip clutch has slipped, and this can be done without tools.

[0009] It is particularly advantageous if the toothing of the first output element is internal and the mating toothing of the output part is external, with the external toothing of the output part being axially slid into the internal toothing of the first output element. This results in a toothed connection that is quick to connect and also quick to disconnect, and which reliably transmits the applied torque during normal operation.

[0010] According to the invention, the output element comprises a first disc and a second disc arranged radially adjacent to each other, the first disc forming the toothing and the second disc serving as an axial stop for the output part. The two discs can, for example, function as toothing elements and stops, and may also have a function for the slip clutch, such as forming a friction surface and supporting a power storage device for clamping. This allows for the creation and use of multifunctional components.

[0011] It is particularly advantageous if the second disc projects further radially inwards than the first disc. This allows for an effective design as a stop for the output part, so that the output part can rest against and be supported by the stop over a defined radial extent.

[0012] It is also advantageous if a third disc is connected to the first output element, serving to support the energy storage device. This allows the energy storage device to be supported on both the third disc and the output element, exerting an axial force on the output element. The third disc thus accommodates and supports the energy storage device, which can, for example, be designed as a disc spring. The energy storage device, acting as a disc spring, can be positioned radially on the outside of the third disc and radially on the inside of the output element. This results in an efficient and space-optimized design.

[0013] It is particularly advantageous if the third disc is connected to the first and second discs, especially by riveting. This allows for an effective design, particularly when the three discs—the first, second, and third—are connected by one or more rivets.

[0014] It is also advantageous if the damping device is or has a spring damping device. This allows for advantageous torsional vibration damping, particularly with a spring damping device using arc springs.

[0015] Furthermore, it is advantageous to provide a centrifugal pendulum device with at least one flange element and pendulum masses that can be moved along it. This further improves torsional vibration damping.

[0016] It is also advantageous if at least one flange element of the centrifugal pendulum device is rotationally fixed to the output part, in particular by riveting. This allows the torsional vibrations of the output part to be further dampened or eliminated.

[0017] It is also advantageous if the third disc forms at least one axially projecting tongue which can engage in a recess of a flange element for pre-assembly. This allows the rotational position of the components of the third disc and the flange element to be precisely defined during assembly until the assembly is complete.

[0018] The present invention is explained in more detail below with reference to preferred embodiments in conjunction with the associated figure.

[0019] This shows: Fig. 1 a schematic half-section view of a torsional vibration damper according to the state of the art, Fig. 2 a schematic half-section view of another torsional vibration damper according to the state of the art, Fig. 2a a schematic half-section view of another torsional vibration damper according to the state of the art, Fig. 2b a detailed view of the slip clutch of the torsional vibration damper according to the Fig. 2 and Fig. 2a, Fig. 3 a schematic half-section view of a torsional vibration damper according to the invention, Fig. 3a an enlarged detail view of the torsional vibration damper according to Fig. 3 in a first sectioning plane, Fig. 4 an enlarged detail view of the torsional vibration damper according to Fig. 3 in a second sectioning plane, Fig. 4a an enlarged detail view of an alternative torsional vibration damper according to the invention, Fig. 5a a further detailed representation of the torsional vibration damper according to the invention Fig. 3, Fig. 5b a further detailed representation of the torsional vibration damper according to the invention Fig. 3, and Fig. 5c a further detailed representation of the torsional vibration damper according to the invention Fig. 3.

[0020] The Fig. Figure 1 shows a half-section of a torsional vibration damper 1 according to the prior art, which is rotatable with respect to the axis xx. The torsional vibration damper 1 shown is designed as a torsional vibration damper 1 for a DHT transmission.

[0021] The torsional vibration damper 1 has an input part 2 and an output part 3, which are arranged to rotate relative to each other. A spring damper assembly 4, which is designed with spring elements 5, is arranged in the torque path between the input part 2 and the output part 3. The spring elements 5 can be designed as arc springs. The spring damper assembly 4 is arranged and designed in the torque path between the input part 2 and the output part 3 such that it counteracts the rotation between the input part 2 and the output part 3 and generates a restoring force between the input part 2 and the output part 3.

[0022] The inlet part 2 is formed from a first disc element 6 and a second disc element 7, which form a channel 8 for receiving and supporting the spring elements 5. The springs are supported on the disc elements 6, 7 radially outwards via a sliding shell 21 and circumferentially, in particular against stops 10. A flange 9 is supported circumferentially on the outlet side of the spring elements 5.

[0023] The channel 8 is typically filled with grease or lubricant and the grease caps 22, the diaphragm ring 24 and the disc spring diaphragm 23 serve to seal it.

[0024] The torsional vibration damper 1 further comprises a slip clutch 13 as a torque limiter downstream in the torque flow of the spring damper device 4, which is connected on the input side to the output side flange 9 of the first spring damper device 4 and on the output side to the output part 3.

[0025] The flange 9 engages between two plates 14, 15 acting as support discs, which are riveted to the starting part 3 by means of a rivet element 17. The flange 9 is arranged in a friction-fit manner between the support discs 14, 15.

[0026] A toothed ring 16 is arranged on the disc element 6.

[0027] Screws 18 are provided for screwing the input part 2 to a crankshaft, which also engage a washer 19 which has or performs a centering function.

[0028] An axial ring 20 is arranged axially between the disk 19 and the output part 3 for axial support of the output part 3 on the input part 2.

[0029] The screws 18 must be inserted through the screw openings 25 of the input part 2 and through the openings 26 of the output part 3 and tightened. If the output part 3 is rotated relative to the input part 2 due to slippage of the slip clutch 13, the screws 18 can no longer be unscrewed or removed to disassemble the torsional vibration damper 1.

[0030] The Fig. Figure 2 shows a half-section of another torsional vibration damper 101 according to the prior art, which is rotatable with respect to the axis xx. The torsional vibration damper 101 shown is designed as a torsional vibration damper 101 for a DHT transmission.

[0031] The torsional vibration damper 101 has an input part 102 and an output part 103, which are arranged to rotate relative to each other. A spring damper assembly 104, which is designed with spring elements 105, is arranged in the torque path between the input part 102 and the output part 103. The spring elements 105 can be designed as arc springs. The spring damper assembly 104 is arranged and designed in the torque path between the input part 102 and the output part 103 such that it counteracts the rotation between the input part 102 and the output part 103 and generates a restoring force between the input part 102 and the output part 103.

[0032] The inlet part 102 is formed from a first disc element 106 and a second disc element 107, which form a channel 108 for receiving and supporting the spring elements 105. The springs are supported on the disc elements 106, 107 radially outwards via a sliding shell 121 and circumferentially, in particular against stops 110. A flange 109 is supported circumferentially on the outlet side of the spring elements 105.

[0033] The channel 108 is typically filled with grease or lubricant and the grease caps 122, the diaphragm ring 124 and the disc spring diaphragm 123 serve to seal it.

[0034] The torsional vibration damper 101 further comprises a slip clutch 113 as a torque limiter downstream in the torque flow of the spring damper device 104, which is connected on the input side to the output side flange 109 of the first spring damper device 104 and on the output side to the output part 103.

[0035] The flange 109 forms a support disc 114, which is connected to a second support disc 115. A pressure plate 140 and a disc spring 141 are arranged between them. The disc spring 141 is supported by the support disc 115 and the pressure plate 140 and exerts force on the pressure plate 140 towards a friction disc 142, which is arranged between the pressure plate 140 and the support disc 114. The friction disc 142 is radially connected to the output part 103 on the inside. This connection is made by means of the rivet element 117. The friction disc 142 has friction linings 144 on both sides of a carrier 143.

[0036] A sensor toothing and / or a preset imbalance can be provided on the disc element 106 or on the disc element 107.

[0037] Screws 118 are provided for screwing the input part 102 to a crankshaft, which also engage a washer 119 that has or performs a centering function.

[0038] The screws 118 must be inserted and tightened through the screw openings 125 of the input part 102 and through the openings 126 of the output part 103. If the output part 103 is rotated relative to the input part 102 due to slippage of the slip clutch 113, the screws 118 can no longer be unscrewed to remove the torsional vibration damper 1.

[0039] A centrifugal pendulum device 120 is also connected to the output part 103. The centrifugal pendulum device 120 has at least one flange element 150 with pendulum masses 151 displaceably mounted thereon, wherein the flange element 150 is screwed to the output part 103 in a rotationally fixed manner, see the Fig. 2a with the screws 152.

[0040] The discs 115 and 114 are riveted together using the rivet element 160, see Fig. 2b.

[0041] The Fig. 3, Fig. 3a and Fig. Figure 4 shows a half-section of a torsional vibration damper 201 according to the invention and sectional views thereof, wherein the torsional vibration damper 201 is rotatable with respect to the axis xx. The torsional vibration damper 201 shown is designed as a torsional vibration damper 201 for a DHT transmission; it can also be designed as a dual-mass flywheel, etc.

[0042] The torsional vibration damper 201 has an input part 202 and an output part 203, which are arranged to rotate relative to each other. A spring damper assembly 204, which is designed with spring elements 205, is arranged in the torque path between the input part 202 and the output part 203. The spring elements 205 can be designed as curved springs or as straight springs, and can be single-stage or multi-stage. The spring damper assembly 204 is arranged and designed in the torque path between the input part 202 and the output part 203 such that it counteracts the rotation between the input part 202 and the output part 203 and generates a restoring force between the input part 202 and the output part 203.

[0043] The inlet part 202 is formed from a first disc element 206 and a second disc element 207, which form a channel 208 for receiving and supporting the spring elements 205. The spring elements 205 are supported on the disc elements 206, 207 radially outwards via a sliding shell 221 and circumferentially, in particular against stops 210. A flange 209 is supported circumferentially on the outlet side of the spring elements 205.

[0044] The input part 202 can be designed as a primary vibrating wheel with optional pre-balance. A starter gear and / or encoder gears can also be provided.

[0045] The channel 208 is typically filled with a grease or lubricant and is sealed by optional grease caps, diaphragm rings and a disc spring diaphragm or the axial rings 222 shown, one of the axial rings 222 being axially actuated by a disc spring 223.

[0046] The torsional vibration damper 201 further comprises a slip clutch 213 as a torque limiter downstream in the torque flow of the spring damper device 204, which is connected on the input side to the output side flange 209 of the first spring damper device 204 and on the output side to the output part 203.

[0047] The flange 209, to which friction linings 230 are attached, engages between two plates 214, 215 as support discs, which are radially riveted to each other internally. Axially between the two support discs 214, 215, a pressure disc 216 and a spring disc 217, in particular a disc spring, are provided, which presses the pressure disc 216 against a friction lining 230 of the flange 209. This ensures that the flange 209 is held frictionally between the support disc 214 and the pressure disc 216.

[0048] The slip clutch 213, acting as a torque limiter, is thus arranged in the torque flow between the input part 202 and the output part 203. The slip clutch 213 has a first input element, the flange 209, and a first output element, the support discs 214, 215, which are frictionally connected relative to each other.

[0049] The first output element, the support disc 215, has a radially internal toothing 240 into which a mating toothing 241 of the output part 203 engages. Furthermore, a force storage element 242 is provided, which axially acts on the output part 203 with its mating toothing 241 in the toothing 240 of the first output element, the support disc 215.

[0050] The toothing 240 of the first output element is an internal toothing, while the mating toothing 241 of the output part 203 is an external toothing. This allows the external toothing of the output part 203 to be inserted axially into the internal toothing of the first output element.

[0051] It can be seen that the first output element has a first disk, the support disk 215, and a second disk, the support disk 214, which are arranged radially inward adjacent to each other, with the first support disk 215 forming the toothing 240 and the second support disk 214 serving as an axial stop for the output part 203. For this purpose, the second support disk 214 projects further radially inward than the first support disk 215.

[0052] In the Fig. 3 and Fig. Figure 3a also shows that a third disc 250 is connected to the first output element, i.e., to the support discs 214, 215. This third disc serves to support the energy storage device 242, so that the energy storage device 242 is supported on the one hand by the third disc 250 and on the other hand by the output part 203, exerting an axial force on the output part 203. This forces the output part 203, with its mating teeth 241, into the teeth 240.

[0053] For disassembly after an engagement of the slip clutch 213, the output part 203 can be axially pulled out of the toothing 240 and the output part 203 can be rotated relative to the input part 202.

[0054] It can also be seen that the third disc 250 is connected to the first disc 214 and the second disc 215, in particular riveted by means of the riveting element 251.

[0055] It can also be seen that the third disc 250 forms at least one axially projecting tongue 252, see Fig. 4, which can be engaged for pre-assembly in a recess 260 of a flange element 261 of a centrifugal pendulum device 270. The Fig. 3a and Fig. Figure 4 shows that the tongues 252 are arranged radially outside the third disk 250.

[0056] The Fig. Figure 4a shows that the tongues 252 can also be arranged radially inside the third disk 250.

[0057] The centrifugal pendulum device 270 is provided with at least one flange element 261, 263 and with pendulum masses 264 displaceably mounted thereon. At least one flange element 261 of the centrifugal pendulum device 270 is rotationally fixed to the output part 203, in particular by means of riveting using the rivet element 271.

[0058] The Fig. Sections 5a to 5c show details of this.

[0059] Screws 218 are provided for screwing the input part 202 to a crankshaft, which also engage through a

[0060] The screws 218 must be inserted through the screw openings 225 of the input part 202 and through the openings 226 of the output part 203 and screwed in. If the output part 203 is rotated relative to the input part 202 by slipping of the slip clutch 213, the output part 203 can be axially pulled out of the toothing 240 and rotated, so that unscrewing is easily possible. Reference symbol list 1 torsional vibration damper 2 Entrance section 3 Initial part 4 Spring damper assembly 5 spring element 6 first disc element 7 second disc element 8-channel 9 flange 10 strikes 13 Slip clutch 14 Sheet metal / support disc 15 Sheet metal / support disc 16-tooth sprocket 17 rivet element 18 screw 19 discs 20 Axial ring 21 sliding tray 22 grease cap 23 Belleville washers 24 Membrane ring 25 screw opening 26 Opening 101 Torsional vibration dampers 102 Entrance section 103 Initial section 104 Spring damper assembly 105 spring element 106 first disc element 107 second disc element Channel 108 109 Flange 110 attack 113 Slip clutch 114 first support disc 115 second support disc 117 Rivet element 118 screw 119 disc 120 Centrifugal pendulum device 121 Sliding tray 122 grease cap 123 Belleville washers 124 Membrane ring 125 screw opening 126 Opening 140 printing plate 141 Belleville washer 142 Friction disc 143 carriers 144 Friction lining 150 flange element 151 Pendulum mass 152 screw 160 rivet element 201 Torsional vibration damper 202 Entrance section 203 Initial section 204 Spring damper assembly 205 spring element 206 first disc element 207 second disc element Channel 208 209 Flange 210 stop 213 Slip clutch 214 second sheet metal / support disc / washer 215 first sheet metal / support disc / disc 216 Pressure plate 217 Spring washer 218 screw 221 Sliding tray 222 Axial ring 223 Belleville spring 225 Screw opening 226 Opening 230 friction lining 240 teeth 241 Counter-gearing 242 energy storage units 250 third disc 251 Rivet element 252 Tongue 260 recess 261 Flange element 263 Flange element 264 Pendulum mass 270 Centrifugal pendulum device 271 Rivet element

Claims

[1] Torsional vibration damper (201) with an input part (202) and with an output part (203), wherein the input part (202) is arranged to be rotatable relative to the output part (203), with a damping device in the torque flow between the input part (202) and the output part (203), wherein a slip clutch (213) is further arranged as a torque limiter in the torque flow between the input part (202) and the output part (203), wherein the slip clutch (213) has a first input element and a first output element which are frictionally connected relative to each other, wherein the first output element has a toothing (240) into which a mating toothing (241) of the output part (203) engages, wherein a force storage device (242) axially acts the output part (203) with its mating toothing (241) into the toothing (240) of the first output element, characterized by, that the first output element has a first disk (215) and a second disk (214) arranged radially inside adjacent to each other, wherein the first disk (215) forms the toothing (240) and the second disk (214) serves as an axial stop (210) for the output part (203). [2] Torsional vibration damper (201) according to claim 1, characterized by , that the toothing (240) of the first output element is an internal toothing and wherein the mating toothing (241) of the output part (203) is an external toothing, wherein the external toothing of the output part (203) can be inserted axially into the internal toothing of the first output element. [3] Torsional vibration damper (201) according to claim 1, characterized by , that the second disk (214) extends further radially inwards than the first disk (215). [4] Torsional vibration damper (201) according to claim 1 or 3, characterized by, that a third disk (250) is connected to the first output element, which serves to support the energy storage device (242), so that the energy storage device (242) is supported on the one hand by the third disk (250) and on the other hand by the output part (203) and exerts an axial force on the output part (203). [5] Torsional vibration damper (201) according to claim 4, characterized by , that the third disk (250) is connected to the first disk (215) and the second disk (214), wherein the third disk (250) is riveted to the first disk (215). [6] Torsional vibration damper (201) according to any of the preceding claims, characterized by that the damping device is or has a spring damping device (204). [7] Torsional vibration damper (201) according to one of the preceding claims, characterized by, that a centrifugal pendulum device (270) is provided with at least one flange element (261, 263) and with pendulum masses (264) which can be displaced thereon. [8] Torsional vibration damper (201) according to claim 7, characterized by , that at least one flange element (261, 263) of the centrifugal pendulum device (270) is connected to the output part (203) in a rotationally fixed manner, wherein the flange element (261, 263) of the centrifugal pendulum device (270) is riveted to the output part (203). [9] Torsional vibration damper (201) according to claim 4, characterized by , that the third disc (250) forms at least one axially projecting tongue (252) which can be engaged in a recess (260) of a flange element (261, 263) for pre-assembly.

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