CN110177964B

CN110177964B - Torque transmission device

Info

Publication number: CN110177964B
Application number: CN201880007091.8A
Authority: CN
Inventors: S·马伊恩沙因; T·居尔吕克; M·G·斯旺克; J·拉姆齐; M·施泰因贝格尔
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2017-01-16
Filing date: 2018-01-15
Publication date: 2022-09-27
Anticipated expiration: 2038-01-15
Also published as: DE102017100667A1; WO2018130251A1; CN110177964A; DE112018000390A5

Abstract

The invention relates to a torque transmission device (1) having a dual-mass flywheel (2) having an input part (11) arranged so as to be rotatable about an axis of rotation (d), an output part (26) arranged so as to be rotatable about the axis of rotation (d) relative to the input part against the action of a spring device (14), and a hydrodynamic torque converter (3) having a turbine wheel (6), a pump wheel (5) and a converter lockup clutch (10). In order to mount the torque transmission device (1) in an axially narrow manner, the invention proposes that the torque converter bridging clutch (10) be arranged on the outer circumference of the turbine wheel (6) and the pump wheel (5), and that the spring device (14) coincide at least with an axial mounting space of the turbine wheel (6).

Description

Torque transmission device

Technical Field

The present invention relates to a torque transmission device having a dual mass flywheel, the dual mass flywheel having: an input member arranged in a manner that it can be twisted about an axis of rotation; an output member arranged torsionally about said axis of rotation with respect to said input member against the action of spring means; and a torque converter having a turbine, an impeller, and a torque converter crossover clutch.

Background

Such torque transmission devices are installed, for example, in a drive train of a vehicle having an internal combustion engine and a transmission, in particular in the form of an automatic transmission, and usually comprise a hydrodynamic torque converter arranged between the internal combustion engine and the automatic transmission as a starting element. In order to save energy, the torque converter comprises a torque converter bypass clutch, which bypasses the fluidic torque transmission at higher rotational speeds. In the miniaturization of internal combustion engines, for example, with cylinder closing and a reduced number of cylinders, a greater flywheel mass and effective torsional vibration isolation are required on the crankshaft. For this purpose, a torque transmission device combining a dual mass flywheel and a hydrodynamic torque converter is known, for example, from EP 2700846 a1 and WO 2013/046006 a 1. Since the dual mass flywheel and the torque converter are arranged axially side by side, a large installation space is required.

Disclosure of Invention

The aim of the invention is to expand a torque transmission device with an axially reduced installation space.

This object is achieved by the subject matter of claim 1. Advantageous embodiments of the subject matter of claim 1 are given in the dependent claims of claim 1.

The proposed torque transmission device is provided in particular for a drive train of a motor vehicle, which drive train comprises an internal combustion engine (for example an internal combustion engine with a crankshaft having two to six cylinders) and a transmission (preferably an automatic transmission) with a transmission input shaft. The torque transmission device is arranged between the crankshaft and the transmission input shaft and comprises a dual mass flywheel and a hydrodynamic torque converter with a torque converter bypass clutch.

The dual-mass flywheel comprises an input part, which is arranged so as to be rotatable about an axis of rotation and has a primary flywheel mass, and an output part, which is arranged coaxially with the input part and has a secondary flywheel mass. The input and output members are twistable relative to each other about the axis of rotation against the action of the spring means. The spring device can comprise spring elements arranged on one or more diameters on the circumference, distributed on the circumference, optionally nested one inside the other, for example straight short helical compression springs and/or long bow springs. By means of a corresponding arrangement of the spring elements, a single-stage or multi-stage damping action of the dual-mass flywheel can be achieved. The secondary flywheel mass can be designed as a separate flywheel mass. Alternatively or additionally, the mass of the torque converter, in particular the mass of the housing comprising the impeller, serves as a secondary flywheel mass. In particular, a spring element in the form of a bow spring can be arranged in the annular chamber formed by the input part. The input element can be formed from a sheet metal material, i.e. from a plurality of sheet metal parts connected to one another and directly connected to the crankshaft.

The torque converter comprises a housing which is rotationally locked to the dual mass flywheel and which is arranged coaxially with the input part of the dual mass flywheel or, with compensation for any axial offset, around a rotational axis, for example, the rotational axis of the transmission input shaft, in which housing the pump impeller is advantageously integrated directly, which in the case of a rotational drive about the rotational axis fluidically transmits the torque to the turbine wheel by means of the converter fluid. To increase the torque at low rotational speeds, a stator can be arranged between the pump wheel and the turbine wheel.

The torque converter bypass clutch is arranged on a large diameter and is therefore able to transmit large torques. Advantageously, the converter crossover clutch is integrated directly into the turbine wheel and the pump wheel, in that the turbine wheel has, for example, an annular flange on the radial outside, and a friction surface configured complementarily to the annular flange is provided between the housing and the pump wheel. Friction linings can be provided on the annular flange and/or on the annular surface. The turbine wheel can be axially displaced relative to the pump wheel as a function of the applied pressure or the flow stream of the converter fluid, so that the converter bypass clutch can be operated under the influence of the flowing or pressurized converter fluid.

In order to realize a torque transmission device which is narrowly mounted in the axial direction, the spring device at least partially coincides with the turbine. In this way, the axial free space predefined by the contour of the turbine can be used effectively. In an advantageous manner, in particular to achieve a large diameter, both the torque converter bridging clutch (by being arranged on the outer circumference of the turbine wheel and the pump wheel) and the spring device are arranged at the same radial height.

The torque transmission device can comprise a releasable connection in order to be able to divide the connection, prior to assembly, on a mounting belt of a motor vehicle comprising the drive train into a component received on the crankshaft and a component received on the transmission (for example on the transmission input shaft), and then to connect them. During maintenance or repair of the motor vehicle, the releasable connection can be detached again in order to be able to reversibly disconnect the internal combustion engine and the transmission again. The releasable connection is arranged in particular in the torque flow downstream of the spring device and upstream of the housing of the torque converter. The housing together with the turbine substantially forms the secondary flywheel mass of the dual-mass flywheel. In this case, the torque transmission device is thus divided into a component arranged on the crankshaft and a component associated with the transmission within the dual mass flywheel. The releasable connection can be arranged at the radial level of the converter bypass clutch or radially within the maximally extended installation space of the turbine. The housing can thereby follow the contour of the turbine. The connection element for forming the releasable connection can be arranged here on the housing and on a flange part for the output-side application of the spring device. For example, the flange part can be connected, for example riveted, as a connecting element to a connecting means which is arranged distributed over the circumference on the housing, is designed as a connecting piece, and is fastened to the housing (for example welded to the housing). The releasable connection can be designed axially in that a tool (for example a screwdriver) screws the flange part through a corresponding opening of the input part to the housing, so that a releasable connection is produced between the input part with the spring device (as a component fixed to the crankshaft) and the torque converter (as a component received on the transmission input shaft of the transmission). In an alternative embodiment, the releasable connection can be aligned radially or in the circumferential direction, so that it can be formed or released by means of a tool placed radially from the outside or in the circumferential direction.

According to an advantageous embodiment of the torque transmission device, at least one centrifugal force pendulum can be arranged between the input part and the output part. For example, the at least one centrifugal force pendulum can be arranged between the spring device and the housing.

In an advantageous manner, the at least one centrifugal force pendulum can be arranged at the same radial height as the torque converter bypass clutch and the spring device.

For example, at least one centrifugal force pendulum can be arranged axially between the spring device and the converter bypass clutch. For example, the at least one centrifugal force pendulum can be arranged outside the housing. The centrifugal force pendulum arranged outside the housing can be connected to a flange for the output-side application of the spring device. For example, the pendulum mass carrier of the centrifugal force pendulum can be formed in one piece from a flange part or connected to it. For example, the flange part and the pendulum mass carrier can be connected together to a connecting element of the housing for forming a releasable connection between the two components. Alternatively, the pendulum mass carrier can be connected to the housing, for example welded.

At least one centrifugal force pendulum can be arranged inside the housing. For example, the pendulum mass carrier of the centrifugal pendulum is connected to the housing. Alternatively or additionally, the pendulum mass carrier of the centrifugal force pendulum is connected to the turbine, for example welded and/or soldered or suspended in the turbine.

Drawings

The invention is elucidated in detail with reference to the embodiments shown in fig. 1 to 3. Shown here are:

figure 1 shows in a schematic representation the upper part of a torque-transmitting device arranged around a rotation axis,

fig. 2 shows in a schematic representation an upper part of a torque transmission device similar to the torque transmission device of fig. 1, with a centrifugal force pendulum arranged outside the housing of the torque converter,

and

fig. 3 shows an upper part of a torque transmission device similar to the torque transmission device of fig. 2 in a schematic representation, with a centrifugal force pendulum arranged inside a housing of the torque converter.

Detailed Description

Fig. 1 shows schematically an upper part of a torque transmission device 1 arranged around a rotational axis d. The torque transmission device 1 is preferably arranged in the drive train of a motor vehicle between a torsional internal combustion engine having a crankshaft and a transmission having a transmission input shaft.

The torque transmission device 1 provides a function of decoupling torsional oscillations of the internal combustion engine and of the starting element with rotational speed. For this purpose, a dual mass flywheel 2 and a hydrodynamic torque converter 3 are provided.

The torque converter 3 comprises a housing 4 with a pump impeller 5, a turbine wheel 6 and a stator 7 which is connected to the transmission housing via a freewheel, not shown. In order to bridge the lossy fluidic torque transmission through the impeller 5 to the turbine 6, the turbine 6 has a radially outer, radially expanding annular flange 8, while the impeller 5 has an annular surface 9 at the transition to the housing 4, which, in the event of an axial displacement of the turbine 6 relative to the impeller 5 as a result of the control of the converter fluid contained in the housing 4, enters into a friction fit in a switchable manner, thus forming a converter crossover clutch 10. The torque converter 3 is received in a rotatable manner on a transmission input shaft of the transmission.

The dual mass flywheel 2 has an input element 11 that can be rotated about an axis of rotation d, which is connected to the crankshaft of the internal combustion engine and forms a primary flywheel mass 12 of the dual mass flywheel 2. The output element 26 of the torque transmission device 1, which comprises or forms the secondary flywheel mass 13, is formed by the housing 4 and the impeller 5 of the torque converter 3 integrated therein. A spring device 14 having spring elements 15, for example bow springs, which are distributed over the circumference, is arranged operatively in the circumferential direction between the input element 11 and the housing 4. The spring element 15 is received in a ring chamber 16 formed by the input part 11 and is loaded on the input side by pressing the input part 11. The output-side loading is effected by means of a flange part 17, the radially extending arms 18 of which engage between the spring elements 15 from the radially inside.

A releasable connection 19 is provided between the spring device 14 and the housing 4. The releasable connection 19 is formed by connecting

elements

20, 21 arranged distributed over the circumference, which are connected by means of bolts 22 in the axial direction under the action of a tool inserted through the clutch housing or the like. For this purpose, a corresponding opening, not shown, is provided in the input element 11. The connecting element 20 is arranged radially on the inside on the flange part 17 and is connected to the connecting element 21 by means of a screw 22. The connecting element 21 is provided as a connecting piece with an internal thread for the bolt 22 and is connected, for example welded, to the housing 4, which is adapted to the contour of the turbine 6, radially inside the axially largest circumference of the turbine 6. The contour of the flange part 17 around the housing 4 is guided, for example, slightly curved, in order to achieve an axial coincidence of the spring element 15 with the turbine 6 and thus to reduce the axial installation space of the torque transmission device. In the exemplary embodiment shown, the spring element 15 is essentially completely recessed into the axial installation space of the turbine 6 and is arranged at the radial level of the converter bypass clutch 10.

Fig. 2 shows a schematic representation of a torque transmission device 1a with a centrifugal force pendulum 23a in a variant of the torque transmission device 1 of fig. 1. The centrifugal force pendulum 23a comprises a pendulum mass carrier 24a and a pendulum mass 25a, on which the pendulum mass can be pivoted along a pendulum path and is received in a distributed manner on the circumference. The centrifugal force pendulum 23a is arranged outside the housing 4a of the torque converter 3 a. Here, the pendulum mass 25a is received axially between the spring element 15a of the spring arrangement 14a of the dual mass flywheel 2a and the torque converter bypass clutch 10a and radially at the same level thereof. In this sense, the centrifugal force pendulum 23a is at the radial level of the spring device 14a and the converter bypass clutch 10a, since the pendulum mass carrier 24a does not substantially contribute to the damping effect of the rotational speed adaptation of the centrifugal force pendulum 23 a. The spring element 15a coincides with the axial installation space of the turbine 6a for reducing the axial installation space of the torque transmission device 1 a. The pendulum mass carrier 24a is received radially on the inside together with the flange part 17a on the connecting element 21a of the housing 4a and forms a releasable connection 19a with the housing.

Fig. 3 shows, in the same illustration, a torque transmission device 1b with a centrifugal force pendulum 23b arranged inside the housing 4b in a variant of the torque transmission device 1a of fig. 2. The housing 4b expands axially in the radial region of the converter bypass clutch 10b and receives the pendulum mass 25b of the centrifugal force pendulum 23 b. The pendulum mass carrier 24b is axially pivoted radially inside the pendulum mass 25b and is connected, for example welded, to the housing 4 b. In other embodiments, the pendulum mass carrier, which is designed in the manner of an annular flat surface, can be attached to the radially outer inner circumference of the housing 4b, for example welded thereto. The pendulum mass 25b is arranged axially between the spring element 15b of the spring arrangement 14b and the converter bypass clutch 10b and radially at the level thereof. The spring element 15b coincides with the axial installation space of the turbine 6b for reducing the axial installation space of the torque transmission device 1 b.

List of reference numerals

1 Torque transmission device

1a Torque Transmission device

1b Torque Transmission device

2 double-mass flywheel

2a dual mass flywheel

3 Torque converter

3a torque converter

4 casing

4a casing

4b housing

5 pump wheel

6 turbine

6a turbine

6b turbine

7 guide wheel

8 annular flange

9 ring surface

10 torque converter crossover clutch

10a torque converter crossover clutch

10b converter bridging clutch

11 input member

12 primary flywheel mass

13 secondary flywheel mass

14 spring device

14a spring device

14b spring device

15 spring element

15a spring element

15b spring element

16 ring cavity

17 Flange part

17a flange part

18 arm

19 releasable connection

19a releasable connection

20 connecting element

21 connecting element

21a connecting element

22 bolt

23a centrifugal force pendulum

23b centrifugal force pendulum

24a pendulum mass support

24b pendulum mass support

25a pendulum mass

25b pendulum mass

26 output member

d axis of rotation.

Claims

1. A torque transmission device (1, 1a, 1b) having a dual mass flywheel (2, 2a) with: an input member (11) arranged so as to be rotatable about a rotation axis (d); an output member (26) arranged in a torsionally movable manner about said axis of rotation (d) with respect to said input member against the action of spring means (14, 14a, 14 b); and a hydrodynamic torque converter (3, 3a) having a turbine wheel (6, 6a, 6b), a pump wheel (5) and a torque converter bypass clutch (10, 10a, 10b), characterized in that the torque converter bypass clutch (10, 10a, 10b) is arranged on the outer circumference of the turbine wheel (6, 6a, 6b) and the pump wheel (5), and in that the spring device (14, 14a) coincides at least with an axial installation space of the turbine wheel (6, 6a, 6 b).

2. The torque transmitting device (1, 1a, 1b) according to claim 1, wherein said spring device (14, 14a) and said torque converter crossover clutch (10, 10a, 10b) are arranged at the same radial height.

3. Torque transmission device (1, 1a, 1b) according to claim 1 or 2, characterised in that a primary flywheel mass (12) is assigned to the input element (11) and a secondary flywheel mass (13) is assigned to the output element (26).

4. Torque transmitting device (1, 1a, 1b) according to claim 3, characterized in that said secondary flywheel mass (13) is constituted by a housing (4, 4a, 4b) of the torque converter (3, 3a) and a pump wheel (5) integrated into said housing (4, 4a, 4 b).

5. Torque transmitting device (1, 1a, 1b) according to claim 4, characterized in that a releasable connection (19, 19a) is provided between the spring means (14, 14a) and the housing (4, 4a, 4 b).

6. Torque transmitting device (1a, 1b) according to claim 4, characterized in that at least one centrifugal force pendulum (23a, 23b) is arranged between the input (11) and the output (26).

7. Torque transmitting device (1a, 1b) according to claim 6, characterized in that at least one centrifugal force pendulum (23a, 23b) is arranged at the same radial level as the torque converter crossover clutch (10a, 10b) and the spring device (14a, 14 b).

8. Torque transmitting device (1a, 1b) according to claim 6 or 7, characterized in that at least one centrifugal force pendulum (23a, 23b) is arranged axially between said spring device (14a, 14b) and a converter crossover clutch (10a, 10 b).

9. Torque transmitting device (1a) according to claim 6 or 7, characterized in that at least one centrifugal force pendulum (23a) is arranged outside said housing (4 a).

10. Torque transmitting device (1b) according to claim 6 or 7, characterized in that at least one centrifugal force pendulum (23b) is arranged inside said housing (4 b).