DE102017114445A1 - Hydrodynamic torque converter with torsional vibration damper - Google Patents

Abstract

The invention relates to a hydrodynamic torque converter (1), in particular for a drive train of a motor vehicle, having a torsional vibration damper (14) rotatably mounted within a converter housing (2) about an axis of rotation (d) of the torque converter (1) and having two counter to the action of a spring device (32). opposite limited about the axis of rotation (d) rotatable damper parts (15, 16). In order to be able to adapt properties of the spring device (32) more effectively to the requirements in a torque converter, the spring device (32) is formed from leg springs (17, 18) which are effectively arranged at least between the damper parts (15, 16).

Description

The invention relates to a hydrodynamic torque converter, in particular for a drive train of a motor vehicle, having a torsional vibration damper arranged rotatably about a rotational axis of the torque converter with two damper parts rotatable about the axis of rotation and limited against the action of a spring device.

Hydrodynamic torque converters are used in particular in drive trains of motor vehicles as starting clutches and for torque increase at low speeds between an internal combustion engine and a transmission. In order also to isolate from the internal combustion engine in the torque converter registered torsional vibrations, can - as for example from the documents WO 2015/013212 A1 . DE 10 2015 221 282 A1 . DE 10 2014 217 472 A1 and DE 10 2011 100 166 A1 known - in the converter housing of the torque converter, one or more torsional vibration and / or torsional vibration absorbers such as centrifugal pendulum be added. The torsional vibration damper in this case have spring devices which have distributed over the circumference arranged spring elements such as bow springs and / or short helical compression springs. In this case, bow springs require a large circumference and must be arranged radially outside in the converter housing. If such spring elements are arranged in the region of the turbine wheel, they require a large axial space.

Furthermore, torque converters in hybrid powertrains with an electric machine, for example, from WO 2011/086461 A1 known. The accommodation of the electric machine takes up a large amount of space.

The object of the invention is the development of a hydrodynamic torque converter with a torsional vibration damper. In particular, a torque converter to be proposed with a torsional vibration damper, which takes up little space. In particular, a torque converter with a torsional vibration damper with modified characteristics of the spring device is to be proposed.

The object is solved by the subject matter of claim 1. The dependent of the claim 1 claims give advantageous embodiments of the subject matter of claim 1 again.

The proposed hydrodynamic torque converter is used in particular in a drive train of a motor vehicle as a starting clutch and torque increase at lower speeds. For this purpose, the torque converter has a transformer housing filled with converter fluid with an impeller, a hydraulically driven by this turbine wheel and a stator arranged between them. In order to bridge the torque converter at higher speeds, a torque converter lock-up clutch can be effectively arranged between the impeller or the converter housing and the turbine wheel.

For the isolation of, for example, introduced by the internal combustion engine of the drive train torsional vibrations of the torque converter within the converter housing at least one rotatable about the axis of rotation of the torque converter arranged torsional vibration damper and / or at least one centrifugal pendulum. At least one of the torsional vibration damper has two counter to the action of a spring device with respect to limited rotatable about the axis of rotation damper parts, wherein the spring means is formed of at least one effective between the damper parts leg spring.

Due to the axially flat design of the at least one leg spring and the changed spring characteristic, a torsional vibration damper can be proposed which is axially narrow and may optionally be arranged on a small diameter.

The pending between the damper parts moment is transmitted via the contact surface of the leg of the at least one leg spring. Here, the leg is designed so stiff that a non-positive transmission between the contact surface and the first damper part is possible. To limit the torque, a slip clutch may be provided in the torsional vibration damper. This can for example be provided between the fixed receiving the at least one leg spring and the first damper part or between two unlimited against the action of the slip-rotatable components. Alternatively or additionally, slippage of the contact between the leg and the first damper part can be avoided by providing a stop between the limb and the first damper part at an intended maximum angle of rotation of the damper parts. In conjunction with a slip clutch, a torque window can be set between a minimum and a maximum torque that can be transmitted via the torsional vibration damper.

To provide the spring action in the circumferential direction, the at least one leg spring is fixedly arranged on a first damper part. The example arranged spirally around the axis of rotation legs forms at its end relative to the second damper part dependent on a twist angle of the damper parts force-loaded contact surface. For example, the contact surface may have a contact profile in the circumferential direction, which has a changing contact point with a rotation of the damper parts, wherein the contact profile is configured such that the second damper part exerts different radial and / or circumferential forces on the leg depending on the rotation. As a result, a torsion angle-dependent, for example progressive, linear or degressive spring characteristic of the at least one leg spring can be set.

The at least one leg spring can be produced, for example, in a cost-effective manner from sheet metal, for example, stamped and then cured. By producing torsion springs of different thickness while maintaining the same punching image leg springs can be produced and used with different spring properties in a cost effective manner.

To provide a contact of the second damper part to the contact surface of the leg of the at least one leg spring, the second damper part form a rolling or sliding contact to the contact surface. For example, this may be provided on the second damper part, a cam or a rolling bearing. By providing a round, epicycloid or otherwise profiled contact profile with respect to the contact surface, alternatively or additionally to the contact profile of the contact surface, a loading of the leg of the at least one leg spring predetermined by the angle of rotation can be set.

According to an advantageous embodiment of the torsional vibration damper at least two leg springs are provided with evenly distributed over the circumference arranged contact surfaces of their legs. For example, two or more leg springs may be provided in an even number, wherein the contact surfaces are arranged radially opposite each two legs of the leg springs. For example, three leg springs may be provided with offset by 120 ° arranged contact surfaces.

If several leg springs are provided, they can be arranged radially one above the other and / or axially next to each other. With several leg springs all leg springs may be fixedly arranged on a single or on both damper parts, so that all legs each form a contact surface to the other damper part or contact surfaces of different legs are formed to both damper parts.

According to an advantageous embodiment of the torsional vibration damper in the proposed hydrodynamic torque converter, two axially spaced leg springs are provided, which receive axially between them a first, preferably designed as an input part damper part. Here, the leg springs are firmly connected to a first, preferably designed as an output part damper part, for example caulked. The second damper part can be rotationally connected with a converter lockup clutch and / or with a turbine wheel of the torque converter and the first damper part with an output part rotatably connected. For example, the second damper part may be formed as an externally toothed disc part, which may be rotationally connected to an outer disk carrier of the torque converter lockup clutch. The first damper part may be formed as a hub, which is rotationally connected to a shaft such as transmission input shaft of a transmission. The second damper part may be rotatably mounted on the first damper part limited, for example, be slidable or roller bearings. The design of the torsional vibration damper can be such that the torsional vibration damper has a smaller, preferably a limited to at least two thirds of the diameter of the turbine wheel diameter. The spring characteristics of one or more leg springs allow for a similar performance as a spring damper with coil springs, so that overall the torque converter can be provided with a smaller space.

For example, a hydrodynamic torque converter may be proposed, whose converter housing has a stepped construction with respect to its diameter, wherein the torsional vibration damper is accommodated in a region of smaller diameter. Such an embodiment of the torque converter is particularly suitable for a hybrid powertrain with an electric machine and an internal combustion engine. In an advantageous manner, an electric machine arranged around the axis of rotation can be arranged radially outside the torsional vibration damper and outside the converter housing, as can be fastened thereto. In special cases, the electric machine may be provided in a non-stepped converter housing radially outside of the torsional vibration damper within the converter housing.

• 1 einen hydrodynamischen Drehmomentwandler in geschnittener Ansicht mit einem Drehschwingungsdämpfer mit Schenkelfedern und
• 2 eine Ansicht des Drehschwingungsdämpfers der 1.

The invention is based on the in the 1 and 2 illustrated embodiment illustrated. Showing:

• 1 a hydrodynamic torque converter in a sectional view with a torsional vibration damper with leg springs and
• 2 a view of the torsional vibration damper 1 ,

The 1 shows that around the axis of rotation d rotatably arranged hydrodynamic torque converter 1 in a sectional view with the converter housing 2 , in which an impeller, not shown 3 is integrated. The impeller 3 hydraulically drives the turbine wheel 4 at. Between the impeller 3 and the turbine wheel 4 is the non-visible stator 5 arranged.

To bridge the hydraulic transmission of torque between impeller 3 and turbine wheel 4 is the torque converter lockup clutch 6 provided as a multi-plate clutch by means of the hydraulically actuated piston 7 opened and closed. The inner disc carrier 8th for the slats 9 is with that as the input part of the torque converter 1 provided converter housing 2 connected. The outer disc carrier 10 for the slats 11 is on the hub 12 acting as the output part of the torque converter 1 provided is rotatable centered added. The outer disc carrier 10 is by means of the rivet 13 connected to the turbine wheel.

Between the outer plate carrier 10 and the hub 12 is the torsional vibration damper 14 effectively provided. The torsional vibration damper 14 is therefore with closed torque converter lockup clutch 6 as a lock-up damper and with the converter lock-up clutch open 6 designed as a turbine damper. It is understood that the torsional vibration damper 14 be connected in another way and can be operated in combination with other torsional vibration isolation devices such as torsional vibration dampers and / or torsional vibration absorbers such as centrifugal pendulum.

The torsional vibration damper 14 shows the two against the action of the spring device 32 against each other about the axis of rotation d limited rotatable damper parts 15 . 16 on, wherein the second damper part 15 as an input part and the first damper part 16 as a starting part - here in the form of the hub 12 - are trained.

On the hub 12 and thus the damper part 16 are axially spaced the two torsion springs 17 . 18 firmly recorded as cramped here. Axially between the torsion springs 17 . 18 is the first damper part 15 in the form of the disc part 19 opposite the hub 12 limited rotatable and on this by means of sliding bearings 20 centered. Radially outside is the disc part 19 by means of the external toothing 21 rotationally locked in the internal toothing 22 received rotationally. The thigh 23 . 24 the thigh feathers 17 . 18 are formed spirally around the axis of rotation and have radially opposite the contact surfaces 25 . 26 on which the by means of the pins 27 . 28 in the disc part 19 recorded rolling bearings 29 . 30 roll off.

In a relative rotation of the two damper parts 15 . 16 around the axis of rotation d apply the rolling bearings 29 . 30 over the contact surfaces 25 . 26 depending on the design of the contact profile of the contact surfaces 25 . 26 with radial and / or circumferential or tangential forces the torsion springs 17 . 18 , so that elastic loading of the torsion springs 17 . 18 depends on the angle of rotation of the damper parts and thus on the one hand to the damper parts 15 . 16 transmitted torques such as tensile or shear torque and on the other hand, a torsional vibration torque is damped.

The torque transmission of torque through the damper parts 15 . 16 and about the thigh springs 17 . 18 takes place between the torsion springs 17 . 18 and the damper part 15 positive or positive and between the contact surfaces 25 . 26 the thigh 23 . 24 and the damper part 16 a force fit. To limit the angle of rotation of the damper parts 15 . 16 and a positive transmission of the torque can between the damper parts 15 . 16 or the thighs 23 . 24 and the damper part 16 not shown stops, which may optionally contain bump stop made of plastics such as elastomers may be provided.

Due to the improved effect of the torsion springs 17 . 18 compared to coil springs such as short helical compression springs or bow springs with reduced installation space, the wet-operated lockup clutch can 6 and the torsional vibration damper 14 be limited to a radial space, which is substantially smaller than the radial space of the turbine wheel 4 is. For example, the diameter of the torsional vibration damper 14 less than two thirds of the diameter of the turbine wheel 4 be. Due to the reduced installation space of the torsional vibration damper 14 can the converter housing 2 radially stepped with a first diameter D1 for the turbine wheel 4 and a second diameter D2 for the torsional vibration damper 14 and the lockup clutch 6 be educated. In this case gained space 31 is herbei accommodated in a hybrid drive train an electric motor not shown.

The 2 shows the torsional vibration damper 14 of the 1 in view with a view of the second damper part 15 in the form of the disc part 19 and the first damper part 15 trained the hub 12 taken up leg spring 18 with the spiral around the axis of rotation d arranged legs 24 , The thigh 24 has at the end of the contact surface 26 on, on the contact profile at a rotation of the damper parts 15 . 16 around the axis of rotation d that by means of the pen 28 in the disc part 19 recorded rolling bearings 30 rolls and while the leg spring 18 subjected to radial and / or circumferential or tangential forces and the upcoming torque under damping of torsional vibrations by intermediate storage of energy in the leg spring 18 transfers. The disc part 19 has radially outward the external teeth 21 for rotational reception in the outer lamp carrier 10 the lockup clutch 6 ( 1 ) on.

LIST OF REFERENCE NUMBERS

1

Hydrodynamic torque converter

2

converter housing

3

impeller

4

turbine

5

stator

6

Converter lockup clutch

7

piston

8th

Inner disk carrier

9

lamella

10

External disk carrier

11

lamella

12

hub

13

rivet

14

torsional vibration dampers

15

damper part

16

damper part

17

Leg spring

18

Leg spring

19

disk part

20

plain bearing

21

external teeth

22

internal gearing

23

leg

24

leg

25

contact area

26

contact area

27

pen

28

pen

29

roller bearing

30

roller bearing

31

space

32

spring means

d

axis of rotation

D1

diameter

D2

diameter

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2015/013212 A1 [0002]
• DE 102015221282 A1 [0002]
• DE 102014217472 A1 [0002]
• DE 102011100166 A1 [0002]
• WO 2011/086461 A1 [0003]

Claims (10)

Hydrodynamic torque converter (1) in particular for a drive train of a motor vehicle with a torsional vibration damper (14) rotatably mounted within a converter housing (2) about an axis of rotation (d) of the torque converter (1) with two counter to the action of a spring device (32) limited to the one Rotational axis (d) rotatable damper parts (15, 16), characterized in that the spring means (32) from at least one between the damper parts (15, 16) is effectively arranged leg spring (17, 18) is formed. Hydrodynamic torque converter (1) to Claim 1 , characterized in that the at least one leg spring (17, 18) on a first damper part (16) is fixedly arranged and whose legs (23, 24) relative to a second damper part (15) one of a twist angle of the damper parts (15, 16) dependent force-loaded contact surface (25, 26) is formed. Hydrodynamic torque converter (1) to Claim 2 , characterized in that the second damper part (15) forms a rolling or sliding contact with the contact surface (25, 26). Hydrodynamic torque converter (1) according to one of Claims 1 to 3 , characterized in that at least two leg springs (17, 18) are arranged distributed over the circumference uniformly distributed contact surfaces (25, 26) of their legs (23, 24). Hydrodynamic torque converter (1) according to one of Claims 1 to 4 , characterized in that a plurality of leg springs (17, 18) are arranged radially one above the other and / or axially adjacent to each other. Hydrodynamic torque converter (1) according to one of Claims 1 to 5 , characterized in that two axially spaced leg springs (17, 18) receive axially between them a second, preferably designed as an input part damper part (15) and the leg springs (17, 18) fixed to a second, preferably designed as an output part first damper part (16 ) are firmly connected. Hydrodynamic torque converter (1) to Claim 6 , characterized in that the second damper part (15) rotationally connected to a torque converter lockup clutch (6) and / or with a turbine wheel (4) of the torque converter (1) and the first damper part (16) with an output part of the torque converter (1) are rotationally connected , Hydrodynamic torque converter (1) according to one of Claims 1 to 7 , characterized in that the torsional vibration damper (1) has a smaller, preferably a limited to at least two thirds of the diameter of the turbine wheel diameter. Hydrodynamic torque converter (1) to Claim 8 , characterized in that the transducer housing (2) has a stepped construction with respect to its diameter, wherein the torsional vibration damper (14) in a region of smaller diameter (D2) is housed. Hydrodynamic torque converter (1) to Claim 8 or 9 , characterized in that arranged radially outside of the torsional vibration damper (14) about the rotational axis (d) arranged electric machine.

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