CN114502857A

CN114502857A - Torsional vibration damper

Info

Publication number: CN114502857A
Application number: CN202080070757.1A
Authority: CN
Inventors: 马克·芬肯策勒; 罗曼·魏森博恩; 帕斯卡尔·斯特拉塞
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2019-10-17
Filing date: 2020-10-05
Publication date: 2022-05-13
Also published as: DE102019128038B4; DE112020005144A5; WO2021073684A1; WO2021073683A1; DE102019128038A1; EP4045815A1

Abstract

The invention relates to a torsional vibration damper (1) which is inserted into a drive train of a hybrid vehicle and is designed as a dual-mass flywheel, comprising a primary part (2) and a multi-part secondary part (3), and a spring damping device (6) which damps torsional vibrations of the primary part (2) and/or the secondary part (3). Furthermore, the torsional vibration damper (1) comprises a K0 disconnect clutch (15), which K0 disconnect clutch is associated with the curved spring flange (9) of the secondary part (3), and which K0 disconnect clutch comprises an actuating device (28) and a clutch disk (33), which is enclosed between an axially movable pressure plate (26) and the curved spring flange (9), which is supported at the radial inside of the primary part (2) via a support bearing (10). The arcuate spring flange (9) is associated with a torque pot (20) oriented in the driven direction and concentrically to the axis of rotation (4), to which is positively fixed an intermediate plate (23) which can optionally be stepped up to a centrifugal pendulum device (24), said plate being in contact via a leaf spring (25) with a pressure plate (26) which is axially displaceable by means of a lever spring (27) of a K0 disconnect clutch (15).

Description

Torsional vibration damper

Technical Field

The invention relates to a torsional vibration damper which can be inserted into a drive train of a hybrid vehicle and is designed as a dual-mass flywheel, and which comprises: a primary part and a multi-piece secondary part, the primary part and the secondary part being rotatably arranged relative to each other about an axis of rotation; and a spring damping device which damps the torsional vibration of the primary part and/or the secondary part, wherein the torsional vibration damper comprises a separating clutch which is associated with the curved spring flange of the secondary part and which comprises an actuating device and a clutch disk which is inserted between the axially displaceable pressure plate and the flat spring flange.

Background

In motor vehicles driven by an internal combustion engine, a discontinuous torque is transmitted in the form of torsional vibrations from the crankshaft of the internal combustion engine to the drive train by the operating principle of the internal combustion engine. In order to damp torsional vibrations, torsional vibration dampers configured as a dual mass flywheel (ZMS) are known from the prior art. For example, DE 102012202255 a1 shows such a torsional vibration damper which can be used for damping or damping and which can be inserted in a drive train between a crankshaft of an internal combustion engine and a shifting clutch connected upstream of a transmission, for example.

In order to be able to meet increasingly stringent emission standards and the required maximum fuel consumption, a large number of vehicle manufacturers plan for the hybrid operation of the drive train. In order to save mass and installation space in a motor vehicle having a hybrid drive with an internal combustion engine (BKM) and at least one electric motor, a torsional vibration damper is usually connected downstream of the internal combustion engine in the torque flow, to which the electric motor is connected. In this case, a friction clutch or a separating clutch is provided between the internal combustion engine and the electric motor, which can decouple the internal combustion engine if the motor vehicle is to be driven only via the electric motor. To achieve the required isolation of the drive train, a centrifugal pendulum may be used.

A drive train for a hybrid vehicle is shown in EP 2769112 a 1. The crankshaft of the internal combustion engine is connected via a torsional vibration damper to the input side of a shifting clutch, referred to as a K0 disconnect clutch. Via the clutch, the torque is transmitted to a driven element of the K0 disconnect clutch, which is coupled to the automatic transmission, for example, via a transmission input shaft.

DE 102019112430 a1 discloses a dual-mass flywheel designed as a torsional vibration damper, which determines a hybrid drive train for a vehicle operated by an internal combustion engine, wherein a secondary part of the dual-mass flywheel is associated with a centrifugal pendulum device.

Disclosure of Invention

The object of the present invention is to provide a structurally and/or functionally improved, modularly constructed torsional vibration damper comprising a clutch, which can be produced in a simplified and cost-effective manner.

The aforementioned problem is solved by means of a torsional vibration damper designed according to the features of claim 1. Advantageous embodiments of the invention are set forth in the dependent claims.

According to the invention, the arc-shaped spring flange of the modularly constructed torsional vibration damper is elongated radially on the inside and is shaped as a bearing dome which is supported at the primary part via a support bearing. The arcuate spring flange furthermore comprises a torque pot, which is aligned in the driven direction and concentrically to the axis of rotation, and to which an intermediate plate, which can optionally be stepped up to a centrifugal pendulum device, is fastened in a form-fitting manner and with play, said intermediate plate being in contact with a pressure plate via a leaf spring, said pressure plate being axially displaceable by means of a lever spring of an actuating device of the separating clutch.

Preferably, the intermediate plate, also referred to as the cover, is positioned axially on the torque pot via a toothed profile, wherein the torque is always transmitted from the arcuate spring flange via the torque pot to the intermediate plate and subsequently via the leaf spring to the pressure plate. For this purpose, the arcuate spring flange is associated with a torque pot, which is oriented in the driven direction and concentrically to the axis of rotation, and to which an intermediate plate is positively and interstitially fastened. The intermediate plate, which performs a plurality of functions, is connected to the pressure plate of the disconnect clutch via a leaf spring. Furthermore, the intermediate plate can assume the carrying function of a pendulum mass for the centrifugal pendulum device. The counter plate of the pressure plate forms an arcuate spring flange, which thereby serves as a thermal mass, between which the clutch disk or the driven disk of the separating clutch is guided.

Advantageously, the concept according to the invention provides the possibility of expanding a modularly constructed torsional vibration damper by means of a centrifugal pendulum device with little effort in order to achieve better damping. The torsional vibration damper can therefore be adapted to different drive train combinations, for example in the following manner: the centrifugal pendulum can optionally be realized in combination with an intermediate plate in order to improve the isolation purpose. The invention thus makes it possible to realize a structurally and at the same time functionally improved torsional vibration damper which can be produced simply and cost-effectively and does not require additional expenditure for assembly.

According to a preferred embodiment of the torsional vibration damper according to the invention, the intermediate plate is acted upon by the restoring force of the leaf spring interacting with the pressure plate when the separating clutch is disengaged. Due to the installation play that exists between the torque pot and the intermediate plate, no complete performance occurs here. In the disengaged state of the separating clutch, the hybrid vehicle is normally driven exclusively via the electric motor, with the internal combustion engine stopped.

When the separating clutch is closed and the vehicle is driven by the internal combustion engine, a lever spring, also referred to as a disk spring, which interacts with the actuating device is supported in a force-fitting manner via a wire loop and an intermediate plate on a securing ring inserted into a groove of the torque tank. Due to the arrangement, the intermediate plate is additionally supported in a friction-fit manner at the torque tank so that the centrifugal pendulum device present at the same time is coupled to the torque tank as required. Advantageously, the structural configuration enables a simple installation and optionally also a simple removal of the intermediate plate without additional, play-free material-or form-fitting connections, such as welding or riveting. For internal combustion engine drives, the centrifugal pendulum device provides a supplementary measure for damping vibrations.

In an advantageous embodiment of the invention, a curved track for the roller of the pendulum mass of the centrifugal pendulum device is introduced into the intermediate plate which is axially fastened via a fastening ring which is fastened at the end face to the torque tank. The torsional vibration damper can thereby be supplemented by the centrifugal pendulum device by simple measures by adding pendulum masses, rollers and fastening elements.

As a measure for achieving a permanent fastening, it is proposed that the torque pot is held against the curved spring flange by means of a closed sheet metal ring and is fastened by means of a circumferentially positioned rivet connection. Connected to the plate ring are segments that are chamfered at right angles at the end and are separated by longitudinal slits, which are guided through openings in the arcuate spring flanges and are aligned concentrically with the axis of rotation in the installed state. In the installed state, the torque pot is supported in the radial direction at the intermediate plate in order to effectively counteract deformation at high rotational speeds and the centrifugal forces associated therewith.

According to a preferred embodiment, at least one leaf spring is provided for the torque transmission from the intermediate plate to the pressure plate. Preferably, for this purpose, the pressure plate comprises a plurality of radially oriented connecting plates which are guided through longitudinal slots of the torque pot and at which the leaf springs are fastened. Furthermore, the leaf spring, which enables the axial displacement of the pressure plate, causes a restoring force of the actuator of the actuating device for the K0 separating clutch when the separating clutch is disengaged.

For actuating the separating clutch, a hydraulic actuating device, also referred to as a Concentric Slave Cylinder (CSC), is preferably suitable, which is formed by a hydrostatic slave cylinder, which is connected via a hydraulic line to a master cylinder, which is actuated by the driver by means of a clutch pedal. The slave cylinder comprises a release bearing in the form of a rolling bearing, which is in direct contact with the separating clutch via a lever spring. Alternatively to a hydraulic actuating device, the invention can be used for a mechanical or electromechanical actuating device.

As a measure for achieving a high friction in the separating clutch between the pressure plate and the curved spring flange, which serves as the thermal mass of the separating clutch and on which the clutch disk, also referred to as driven disk, is guided, it is expedient to contour at least one of the friction surfaces. In this case, the friction surfaces of the arcuate spring flanges and/or of the pressure plate are roughened or profiled, if necessary, in order to achieve a high friction in the production process, for example during the punching process or if necessary by additional machining.

It is also expedient for a torsional vibration damper constructed according to the invention to be provided with a burst protection. For this purpose, cylindrical legs are arranged on the cover element of the primary part, which radially surround the centrifugal force pendulum device at a distance from one another and which, for example, in the event of a damage to the centrifugal force pendulum device block a loose pendulum mass.

Drawings

The invention is explained below with reference to two figures according to a preferred embodiment. The invention is not limited to the embodiments shown. Identical or functionally identical components are provided with the same reference symbols in the figures. Shown here are:

fig. 1 shows a half section of a torsional vibration damper in a first embodiment, in which a K0 disconnect clutch and a variably coupled centrifugal pendulum device are shown; and

fig. 2 shows an enlarged view of detail Z in fig. 1.

Detailed Description

Fig. 1 shows a torsional vibration damper 1 designed as a dual-mass flywheel, which preferably defines a drive train for a hybrid vehicle, which includes an internal combustion engine and an electric motor, not shown, as drives. The torsional vibration damper 1 comprises a primary part 2 screwed to the internal combustion engine on the drive side and a multi-part secondary part 3 associated with the output side, which parts are jointly rotatable about a rotational axis 4 and are arranged rotatably relative to one another. In the torque flow between the primary part 2 and the secondary part 3, a spring damping device 6 comprising an arc spring 5 is provided. For torque transmission, the arcuate spring 6, which is inserted into a spring space 8 delimited by the primary part 2 and the associated cover element 7, is supported on the one hand at the primary part 2 and on the other hand at an arcuate spring flange 9 associated with the secondary part 3, which arcuate spring flange forms the output element of the spring damping device 6. The support bearing 10, which is designed as a rolling bearing, enables a relative rotation between the primary part 2 and the secondary part 3. For this purpose, the curved spring flange 9 is extended radially inward and is formed as a bearing dome 11, which is supported by means of a support bearing 10 on a support shoulder of a bent bracket 12, which is fastened together with the primary part 2 at a crankshaft flange 14 via a crankshaft screw 13. As a measure for sealing the spring space 8 of the spring damping device 5, friction rings 16, 17, which are each acted upon by a

disk spring

18, 19, are supported on both sides on the radial inside at the arcuate spring flange 9, which disk springs are supported relative to one another at the primary part 2 or at the cover element 7 of the primary part 2.

Furthermore, the torsional vibration damper 1 comprises a K0 disconnect clutch 15, which is connected to the arcuate spring flange 9 of the secondary part 3 and which is configured as a friction clutch, K0 disconnect clutch. The K0 disconnect clutch 15 comprises a torque pot 20 which is fixed to the arcuate spring flange 9, is in this case supported against the arcuate spring flange 9 by means of a closed plate ring 22, and is fixed by means of a rivet 41. At the plate ring 22, sections of right-angled chamfer angles separated by longitudinal slits 31 are connected, which sections are guided through the openings 21 in the arcuate spring flanges 9.

On a section of the torque tank 20 oriented concentrically to the rotational axis 4 in the driven direction, an intermediate plate 23, which optionally steps up to a centrifugal force pendulum device 24, is provided via a toothing (not shown) in a form-fitting manner, on both sides of which a roller-guided pendulum mass 29 of the centrifugal force pendulum device 24 can be arranged. Correspondingly, a curved track (not shown) for the rollers of the pendulum mass 29 is introduced into the intermediate plate 23, which is fastened axially via a fastening ring 30, which is fastened on the end side to the torque tank 20. As a burst protection 40 for the centrifugal force pendulum device 24, a bent plate surrounding the centrifugal force pendulum device 24 at a radial distance is arranged on the cover element 7 of the primary part 2.

Via a leaf spring 25 (shown in fig. 2), the intermediate plate 23 is in contact with a pressure plate 26, which is axially displaceable by means of a lever spring 27, also referred to as a disk spring, of an actuating device 28 of the K0 disconnect clutch 15. The pressure plate 26 comprises a plurality of radially oriented webs 32 which are guided through longitudinal slots 31 of the torque pot 20 and at which the leaf springs 25 are fastened. The hydraulic actuating device 28, which is also referred to as a Concentric Slave Cylinder (CSC), comprises a slave cylinder 37, which is connected via a hydraulic line to a master cylinder (not shown), which can be actuated by the driver by means of a clutch pedal. The slave cylinder 37 is associated with a release bearing 38, which is designed as a rolling bearing and is directly operatively connected to the lever spring 27.

The torque transmission, also referred to as torque path, extends from the curved spring flange 9 via the torque pot 20 to the intermediate plate 23, also referred to as cover, and then via at least one leaf spring 25 to the pressure plate 26. In order to disengage the clutch 15, K0, a force is applied to the lever spring 27 via the actuating device 28, as a result of which the pressure plate 26 is moved axially in the direction of the primary part 2 and in the process presses the clutch disk 33 against the friction surface of the curved spring flange 9, as a result of which a friction fit for torque transmission occurs. The torque path extends from the clutch disk 33 into the associated output hub 34, whose mating teeth 35 are intended, for example, for the form-fitting reception of a transmission input shaft (not shown). In fig. 1, K0 is shown disengaging clutch 15 in the disengaged state, in which the hybrid vehicle is driven without the need for an internal combustion engine. The intermediate plate 23 is pressed by means of the preload spring force of the leaf spring 25 against a securing ring 30, which forms a stop and is secured to the torque tank 20, wherein complete performance is not possible due to the play that exists between the torque tank 20 and the intermediate plate 23. In the closed state, when the K0 disconnect clutch 15 is actuated and the internal combustion engine is running, wherein the centrifugal force pendulum device 24 is required, the lever spring 27 is supported via the wire loop 36 at the intermediate plate 23, which is pressed with a high force against the fastening ring 30 in a force-fitting manner. Thereby, the intermediate plate 23 is additionally coupled to the torque tank 20 in a friction-fit manner so as to simultaneously connect the centrifugal force pendulum device 24 with the torque tank 20 as required. This arrangement enables a simple installation and, if appropriate, removal of the intermediate plate 23 without additional, play-free material-fit or form-fit connections.

Fig. 2 illustrates, in an enlarged view, the intermediate plate 23 supported at the securing ring 30 and the connecting plate 32 of the pressure plate 26 guided through the longitudinal slit 31 of the torque tank 20. Furthermore, the installation position of the wire loop 36 is shown, which is supported by the lever spring 27 with force on the side facing away from the fastening ring 30 on the intermediate plate 23. Fig. 2 also shows a leaf spring 25 which is fastened to the intermediate plate 23 by means of a riveting device 39.

Description of the reference numerals

1 torsional vibration damper

2 Primary part

3 Secondary part

4 axis of rotation

5 arc spring

6 spring damping device

7 cover element

8 spring space

9 arc spring flange

10 support bearing

11 bearing arch

12 support

13 crankshaft screw

14 crankshaft flange

15 disconnect clutch

16 friction ring

17 Friction ring

18 disc spring

19 disc spring

20 torque tank

21 opening

22 plate ring

23 middle plate

24 centrifugal pendulum device

25 leaf spring

26 pressing plate

27 lever spring

28 operating device

29 swinging block

30 fixed ring

31 longitudinal slit

32 connecting plate

33 clutch disc

34 driven hub

35 inserting tooth part

36 wire loop

37 slave cylinder

38 Release bearing

39 riveting device

40 burst protector

41 riveting device

Claims

1. A torsional vibration damper (1) which can be incorporated into a drive train of a hybrid vehicle and is designed as a dual mass flywheel, comprising: a primary part (2) and a multi-part secondary part (3), which are rotatably arranged relative to each other about a rotational axis (4); and a spring damping device (6) which damps torsional vibrations of the primary part (2) and/or of the secondary part (3), wherein the torsional vibration damper (1) comprises a separating clutch (15) which is associated with a curved spring flange (9) of the secondary part (3) and which comprises an actuating device (28) and a clutch disk (33) which is inserted between an axially movable pressure plate (26) and the curved spring flange (9), characterized in that the curved spring flange (9) of the modularly constructed torsional vibration damper (1) is supported on the radially inner side at the primary part (2) via a support bearing (10) and a torque pot (20) which is oriented in the driven direction and concentrically to the axis of rotation (4) is fastened at the curved spring flange (9), an intermediate plate (23) is fixed to the torque tank in a form-fitting manner and with play, and is in contact with the pressure plate (26) via a leaf spring (25), and the pressure plate is axially movable by means of a lever spring (27) of the separating clutch (15).

2. Torsional vibration damper (1) according to claim 1, characterized in that the intermediate plate (23) is loaded by the return force of a leaf spring (25) co-acting with the pressure plate (26) when the disconnect clutch (15) is disengaged.

3. The torsional vibration damper (1) as claimed in claim 1 or 2, characterized in that, when the disconnect clutch (15) is closed, a lever spring (27) interacting with the actuating device (28) is supported in a force-fitting manner via a wire loop (36) and the intermediate plate (23) at a securing ring (30) of the torque pot (20).

4. Torsional vibration damper (1) according to one of the preceding claims, characterized in that a curved track for the rollers of the pendulum mass (29) of the centrifugal pendulum device (24) is introduced in the intermediate plate (23).

5. The torsional vibration damper (1) as claimed in any of the preceding claims, characterized in that the torque pot (20) bears against the arcuate spring flange (9) by means of a closed plate ring (22) and is fixed by means of a riveting device (41), and the plate ring (22) comprises vertically oriented segments which are guided through openings (21) in the arcuate spring flange (9) and which are separated by longitudinal slits (31).

6. Torsional vibration damper (1) according to one of the preceding claims, characterized in that for the torque transmission from the intermediate plate (23) to the pressure plate (26) a plurality of leaf springs (25) is provided, wherein the pressure plate (26) is connected with the leaf springs (25) via radially oriented connecting plates (32) which are guided through longitudinal slits (31) of the torque tank (20).

7. Torsional vibration damper (1) according to one of the preceding claims, characterized in that the torque tank (20) is supported at the intermediate plate (23) in the radial direction in the mounted state.

8. Torsional vibration damper (1) according to one of the preceding claims, characterized in that a mechanical, electromechanical or hydraulic coupling system is provided as an actuating device (28) for the K0 disconnect clutch (15).

9. The torsional vibration damper (1) as claimed in any of the preceding claims, characterized in that the friction surface of the arcuate spring flange (9) and/or the friction surface of the pressure plate (26) is roughened and/or profiled for achieving a higher friction.

10. The torsional vibration damper (1) as claimed in any of the preceding claims, characterized in that a burst protection (40) surrounding the centrifugal pendulum device (24) at a radial spacing is provided at the cover element (7) of the primary part (2).