Torsional vibration damper with balancing element

Abstract

The invention relates to a torsional vibration damper (10) with a balancing element for reducing torsional vibrations induced by a drive element and having a damper input (14) which can be rotated about an axis of rotation (20) and which can be connected to the drive element, at least one spring element (26), a damper output (24) which can be rotated in a limited manner relative to the damper input against the action of the spring element, which is supported by a support bearing (70) and which has a damper output element (28), a coupling assembly (58) and a coupling member (60), the coupling member being fixed in a rotationally fixed manner to the damper output element by a connecting piece (62) and forming at least with the coupling assembly and the damper output a subassembly (78) for connecting to the damper input, wherein the subassembly has at least one balancing element (80), the subassembly being balanced independently of the damper input by means of the balancing element.

Description

Technical Field

[0001] This invention relates to a torsional vibration damper. Background Technology

[0002] Torsional vibration dampers are described, for example, in DE 102019129313.8. These dampers are implemented as dual-mass flywheels and are arranged in action between the internal combustion engine and the driven mechanism in the drive system of a vehicle to reduce torsional vibrations. The torsional vibration damper includes a damper input section and a damper output section, as well as an arcuate spring arranged in action between the damper input section and the damper output section. The damper output section is connected to a disengagement clutch, which allows for the controllable transmission of torque between the damper output section and the driven mechanism. The clutch input section of the disengagement clutch is connected to the damper output element of the damper output section via a riveted element. The damper output section is supported on the damper input section by a support bearing.

[0003] The greater the load on the support bearing, the greater the imbalance in the output section of the damper and in the connected components, such as the disengagement clutch. Summary of the Invention

[0004] The purpose of this invention is to better balance torsional vibration dampers and reduce the load on the support bearings. Torsional vibration dampers should be constructed in a simpler and more cost-effective manner.

[0005] At least one of these objectives is achieved by a torsional vibration damper having the features of the present invention. This torsional vibration damper is used to reduce torsional vibrations induced by a drive element and includes: a damper input section rotatable about a rotation axis and connectable to the drive element; at least one spring element; a damper output section supported by a support bearing and having a damper output element, capable of limited rotation relative to the damper input section against the action of the spring element; a connecting assembly and a connecting member, the connecting member being anti-rotationally fixed to the damper output element by a connector, and the connecting member forming, at least with the connecting assembly and the damper output section, a sub-assembly for connection to the damper input section, wherein the sub-assembly has at least one balancing element, and the sub-assembly is balanced independently of the damper input section by the balancing element. This allows for better balancing of the torsional vibration damper and reduces the load on the support bearing. The torsional vibration damper can be constructed more simply and at a lower cost.

[0006] Torsional vibration dampers can be implemented as dual-mass flywheels. Torsional vibration dampers can be installed in vehicles. Torsional vibration dampers can be installed in the drive system of vehicles.

[0007] The centrifugal pendulum can be connected to either the input or output section of a vibration damper. The centrifugal pendulum can have a pendulum flange and multiple pendulum masses supported on the flange with limited deflection along the pendulum track. The pendulum flange can be connected to the output element of the vibration damper in an anti-rotational manner. The pendulum masses can be arranged axially overlapping relative to the spring element. The pendulum masses can be located radially inside the spring element.

[0008] The damper input section can have a primary flywheel disc. The damper input section can be balanced by at least one balancing element directly fixed to the damper input section.

[0009] The spring element can be a compression spring or a curved spring. The spring element can be arranged radially outward from the balancing element. The spring element can be arranged radially outward from the connecting assembly. The spring element can be supported on the damper input section by a sliding cover.

[0010] The damper output element can be a damper output flange or an arc-shaped spring flange. The damper output element can be directly connected to the spring element. The damper output section can be rotatably supported on the damper input section via a support bearing. The sub-assembly can be rotatably supported on the damper input section via a support bearing. The support bearing can be directly housed in the damper output element.

[0011] The connector may have at least one rivet element. The rivet element may be inserted into a through hole in the damper output element. The rivet element may be inserted into a through hole in the connecting element that is axially aligned with a through hole in the damper output element.

[0012] The first end section can be implemented as a first rivet head, which is arranged in a blind hole. The blind hole can be implemented in the damper output element or the connecting member. The sub-assembly can have multiple blind holes in the circumferential direction, wherein some of the blind holes are equipped with at least one balancing element and others are not equipped with one.

[0013] In a preferred embodiment of the invention, the balancing element is received and fixed in a blind hole at a first end section. Here, the blind hole is arranged in a component of the sub-assembly.

[0014] In a preferred embodiment of the invention, the balancing element passes through and engages with a through-hole in a member adjacent to a member having a blind hole, with an intermediate section. The balancing element may have a second end section opposite to the first end section, the second end section abutting against the side of the member having the through hole opposite to the blind hole. The second end section may be implemented as a second rivet head.

[0015] In a particular embodiment of the invention, a through hole is provided in the connecting member and a blind hole is provided in the damper output element. The damper output element can be arranged axially between the connecting member and the damper input portion.

[0016] In a preferred embodiment of the invention, the spring element is arranged within a housing interior space that can be filled with fluid and is defined by the damper housing, and the blind hole opens in a direction away from the housing interior space. The damper output element can at least partially define the housing interior space.

[0017] The fluid can be a lubricant, especially a grease or lubricating oil.

[0018] In a particular embodiment of the invention, the balancing element is implemented as a balancing rivet. This allows the balancing element to be fixed simply and cost-effectively.

[0019] In a preferred embodiment of the invention, the blind hole is implemented as a recess and / or a pressed portion. The blind hole can be implemented in the output element of the vibration damper.

[0020] In a particular embodiment of the invention, the maximum diameter of the section of the through hole adjacent to the blind hole is smaller than the minimum diameter of the section of the blind hole adjacent to the through hole. The blind hole can form a side recess relative to the through hole, particularly the balancing element is fixed in the blind hole via a shape-locking mechanism with the through hole. The balancing element can have a rivet head disposed in the blind hole. The rivet head can have a minimum diameter that is larger than the maximum diameter of the section of the through hole adjacent to the blind hole.

[0021] In a preferred embodiment of the invention, the balancing element is arranged circumferentially offset from the connector. The connector can have multiple rivet elements. The rivet elements can be arranged at the same radial height. The balancing element can be arranged circumferentially between at least two of the rivet elements.

[0022] In a particular embodiment of the invention, the balancing element is arranged radially at the height of the connector. The balancing element can be arranged at the radial height where the rivet element is located.

[0023] In a preferred embodiment of the invention, the coupling assembly includes a clutch for controlled torque transmission between the damper output and the driven mechanism. The coupling element can be implemented as a clutch cover. The clutch can be implemented as a disengaging clutch. The clutch can generate frictional engagement related to the operating force acting on it, so as to transmit torque between the clutch input and clutch output. The clutch input can be fixedly connected to the damper output element or implemented as a single unit. The clutch output can be fixedly connected to the driven disc hub or implemented as a single unit. The clutch can be arranged radially within the spring element. The clutch can be arranged outside the internal space of the housing.

[0024] Other advantages and advantageous designs of the present invention will become apparent from the accompanying drawings. Attached Figure Description

[0025] The present invention will now be described in detail with reference to the accompanying drawings. The drawings show the invention in detail as follows:

[0026] Figure 1 A half-section of a torsional vibration damper in a particular embodiment of the invention is shown.

[0027] Figure 2 It shows Figure 1 Half-section of a sub-assembly of a torsional vibration damper.

[0028] Figure 3 It shows Figure 1 The balancing element of the torsional vibration damper before the fixing process.

[0029] Figure 4 It shows the process after the fixing process. Figure 3 The balancing element in it. Detailed Implementation

[0030] Figure 1 A half-section of a torsional vibration damper 10 according to a specific embodiment of the invention is shown. The torsional vibration damper 10 is arranged between a drive element and a driven mechanism to reduce torsional vibrations in the drive system of a motor vehicle. Torsional vibrations can be induced by the drive element, such as an internal combustion engine. The torsional vibration damper 10 is implemented as a dual-mass flywheel 12 and has a damper input 14, which can be connected to the drive element. The damper input 14 is implemented as the primary flywheel disc 16 of the dual-mass flywheel 12 and can be anti-rotationally connected to the drive element, particularly the crankshaft of an internal combustion engine, via crankshaft bolts 18.

[0031] The damper input section 14 is rotatable about the rotation axis 20 and is welded to the cover 22. The torsional vibration damper 10 has a damper output section 24, which is rotatable relative to the damper input section 14 by means of at least one spring element 26. The spring element 26 is preferably implemented as an arc-shaped spring. In particular, two spring elements 26 are arranged circumferentially between the damper input section 14 and the damper output section 24. The damper output section 24 includes a damper output element 28, particularly an arc-shaped spring flange 30, which is directly connected to the spring element 26 and is rotatable about the rotation axis 20.

[0032] The primary flywheel 16, the cover 22, and the damper output element 28 at least partially form the housing interior space 32, in which the spring element 26 is arranged and can be filled with fluid, especially lubricant, preferably grease.

[0033] A centrifugal pendulum 34 is arranged in the internal space 32 of the housing. The centrifugal pendulum has a pendulum flange 36, which is connected to the damper output element 28 in an anti-rotational manner via a riveting element 38. A plurality of pendulum masses 40, which can be deflected in a limited manner relative to the pendulum flange along the pendulum track, are supported and housed on the pendulum flange 36.

[0034] A clutch 42, used for controllably transmitting torque between the damper output 24 and the driven mechanism, is operatively arranged on the side of the damper output element 28 opposite to the axial direction of the centrifugal pendulum 34. The clutch 42 can be operated by means of an operating device 44 and can transmit torque between the damper output element 28 and the driven mechanism in the operating state. When the clutch 42 is disengaged, torque transmission between the damper output element 28 and the driven mechanism is interrupted. The operating device 44 has a lever spring 45 and, in the operating state of the clutch 42, loads a friction device 46. The friction device includes friction linings 47 and is operatively arranged between the clutch input 48 and the clutch output 50 of the clutch 42. The friction device 46 has a pressure plate 51 that transmits the operating force and, according to the operating force of the operating device 44, induces frictional engagement between the clutch input 48 and the clutch output 50 to transmit torque.

[0035] The clutch output section 48 and the damper output element 28 are integrated as one unit. The clutch output section 50 and the driven disc hub 52 are integrated as one unit, and the driven disc hub can be meshed with the transmission input shaft of the transmission, which serves as the driven mechanism. The friction device 46 is fixedly connected to the clutch output section 50 by a riveting element 54. The operating force for operating the clutch 42 is supported on the clutch cover 56, which radially bridging the clutch 42 in the radially outer region.

[0036] The clutch 42 forms a coupling assembly 58, which is connected to the damper output portion 24. Here, the clutch cover 56 forms a coupling member 60 and is anti-rotationally connected to the damper output element 28 via a connector 62. The connector 62 includes a plurality of circumferentially distributed rivet elements 64, each extending through a through-hole in the clutch cover 56 and through another through-hole in the damper output element 28 axially aligned with the through-hole.

[0037] A friction ring 66 is arranged radially outward of the connector 62, and a coil spring 68 is pre-tensioned and abuts against the friction ring. The coil spring 68 is supported on the cover 22 on the opposite side. Here, the coil spring 68 further seals the internal space 32 of the housing.

[0038] The damper output section 14 is supported on the damper input section 14 by a support bearing 70. Here, the damper output element 28 has a support shaft section 72, on which the support bearing 70 is arranged. On the side radially opposite to the support shaft section 72, the support bearing 70 is housed on a support disc 74 that is fixedly connected to the damper input section 14 by a crankshaft bolt 18.

[0039] The damper input section 14, particularly the primary flywheel disc 16, is balanced by a balancing element 76. However, imbalance in the damper output section 24 and the connecting assembly 58 connected thereto can cause excessive load on the support bearing 70. This load is reduced by forming a sub-assembly 78 with the damper output section 24 equipped with a centrifugal pendulum 34 and the connecting assembly 58, and this sub-assembly is balanced independently of the damper input section 14 by at least one additional balancing element.

[0040] exist Figure 2 It shows Figure 3 The sub-assembly 78 of the torsional vibration damper 10 is described. Here, the sub-assembly 78 is formed by a centrifugal pendulum 34, a damper output element 28, a clutch 42, and a driven disc hub 52. The sub-assembly 78 has at least one balancing element 80, which balances the sub-assembly 78 independently of the damper input. The balancing element 80 is a balancing rivet 82 and is received and fixed in a blind hole 86 in the damper output element 28 with a first end section 84.

[0041] A plurality of such blind holes 86 are preferably provided circumferentially on the damper output element 28. The blind holes can be equipped with balancing elements 80 to balance the sub-assembly 78 when needed. Each blind hole 86 is closed on the side of the damper output element 28 facing the internal space of the housing. Thus, the blind holes 86 without balancing elements keep the internal space of the housing sealed.

[0042] The balancing element 80 extends through a through-hole 92 in the clutch cover 56 via a middle section 90. Here, a second end section 94, opposite to the first end section 84, rests against the side 98 of the clutch cover 56. Thus, the balancing element 80 is fixedly connected to the sub-assembly 78.

[0043] Figure 3 It shows Figure 1 The torsional vibration damper 10 includes a balancing element 80 prior to the fixing process. The balancing element 80 is inserted through a through-hole 92, and a first end section 84 is arranged in a blind hole 86. The maximum diameter D1 of the section of the through-hole 92 adjacent to the blind hole 86 is smaller than the minimum diameter D2 of the section of the blind hole 86 adjacent to the through-hole 92. The blind hole 86 is configured as a side recess relative to the through-hole 92. The balancing element 80 is not fixed relative to the damper output element 28 and the clutch cover 56 prior to the fixing process.

[0044] exist Figure 4 The diagram shows the process after the fixing process. Figure 3 The balancing element 80 is implemented as a balancing rivet 82. Here, the balancing element 80 is subjected to a fastening force Fb, which causes the intermediate section 90 to thicken and the diameter of the first end section 84 to increase. Thus, the balancing element 80 is form-locked into the blind hole 86. The fastening force Fb can be applied during fixing by the reaction force Fg against the damper output element 28, particularly by the support bracket.

[0045] The blind hole 86 can be implemented as a pressed portion and / or recess in the damper output element 28, thereby forming a material protrusion 96 on the opposite side of the damper output element 28. The blind hole 86 can also be introduced by cutting.

[0046] List of reference numerals

[0047] 10 Torsional vibration damper

[0048] 12 Dual-mass flywheel

[0049] 14. Vibration damper input section

[0050] 16. Beginner Flywheel

[0051] 18 Crankshaft Bolts

[0052] 20 Rotation axis

[0053] 22 Cover

[0054] 24. Vibration damper output section

[0055] 26 Spring elements

[0056] 28. Vibration damper output element

[0057] 30 Arc Spring Flange

[0058] 32 Internal space of the shell

[0059] 34 Centrifugal pendulum

[0060] 36 Swing Flange

[0061] 38 Rivet components

[0062] 40 pendulum mass component

[0063] 42 Clutch

[0064] 44 Operating device

[0065] 45 Disc Spring

[0066] 46 Friction device

[0067] 47 Friction Liner

[0068] 48 Clutch input section

[0069] 50 Clutch output section

[0070] 51 Pressure Plate

[0071] 52 Driven disc hub

[0072] 54 Rivet components

[0073] 56 Clutch cover

[0074] 58 Connecting components

[0075] 60 Connecting components

[0076] 62 Connectors

[0077] 64 Rivet components

[0078] 66 Friction Ring

[0079] 68 coil springs

[0080] 70 Support bearing

[0081] 72 Support shaft section

[0082] 74 Support Plate

[0083] 76 Balancing elements

[0084] 78 sub-components

[0085] 80 Balancing elements

[0086] 82 Balanced Rivets

[0087] 84 First end section

[0088] 86 blind holes

[0089] 88 sides

[0090] 90 Intermediate Section

[0091] 92 through hole

[0092] 94 Second end section

[0093] 96 Material protrusions

[0094] D1 Diameter

[0095] D2 diameter

[0096] Fb Fastening force

[0097] Fg reaction force

Claims

1. A torsional vibration damper (10) for reducing torsional vibrations caused by a driving element, the torsional vibration damper having: A damper input section (14) that can rotate around the rotation axis (20) and can be connected to the drive element. At least one spring element (26); A damper output section (24) that is supported by a support bearing (70) and has a damper output element (28) and is able to rotate in a restricted manner relative to the damper input section (14) against the action of the spring element (26). The connecting assembly (58) and the connecting member (60) are fixed to the damper output element (28) in an anti-rotational manner by means of a connector (62), and the connecting member forms a sub-assembly (78) with at least the connecting assembly (58) and the damper output part (24) for connection with the damper input part (14). Its features are, The sub-assembly (78) has at least one balancing element (80), which balances the sub-assembly (78) independently of the damper input (14).

2. The torsional vibration damper (10) according to claim 1, characterized in that, The balancing element (80) is received and fixed in the blind hole (86) with the first end section (84).

3. The torsional vibration damper (10) according to claim 2, characterized in that, The balancing element (80) passes through the through hole (92) of the connecting member (60) adjacent to the damper output element (28) having the blind hole (86) and engages with the intermediate section (90).

4. The torsional vibration damper (10) according to claim 3, characterized in that, The maximum diameter (D1) of the section of the through hole (92) adjacent to the blind hole (86) is smaller than the minimum diameter (D2) of the section of the blind hole (86) adjacent to the through hole (92).

5. The torsional vibration damper (10) according to claim 3, characterized in that, The through hole (92) is provided in the connecting member (60) and the blind hole (86) is provided in the damper output element (28).

6. The torsional vibration damper (10) according to claim 2, characterized in that, The spring element (26) is arranged in a housing interior space (32) that is capable of being filled with fluid and is defined by the damper housing, and the blind hole (86) is open in a direction away from the housing interior space (32).

7. The torsional vibration damper (10) according to claim 2, characterized in that, The blind hole (86) is implemented as a recess and / or a pressed part.

8. The torsional vibration damper (10) according to claim 1, characterized in that, The balancing element (80) is arranged circumferentially offset from the connector (62).

9. The torsional vibration damper (10) according to any one of claims 1-8, characterized in that, The balancing element (80) is arranged radially at the height of the connector (62).

10. The torsional vibration damper (10) according to any one of claims 1-8, characterized in that, The coupling assembly (58) includes a clutch (42) for controlled transmission of torque between the damper output (24) and the driven mechanism, and a coupling member (60) implemented as a clutch cover (56).

Images