Hydrodynamic torque converter

Abstract

The invention relates to a hydrodynamic torque converter having an impeller wheel, a turbine wheel and an oscillation damper which is accommodated in the converter housing, and a converter lockup clutch. Two damper stages are arranged here as a serial damper between the output hub of the torque converter and the converter lockup clutch, and a damper stage is arranged between the turbine wheel and the output hub. In order to improve the damping properties, a rotary oscillation absorber is additionally provided which is arranged between the dampers and is also connected to the turbine wheel in a rotationally fixed fashion.

Claims

.[.1. A hydrodynamic torque converter (1) with a turbine (7) driven by an impeller (6) as well as housing (3) in which a torsional vibration damper (16) with multiple of damper stages (14, 15), a torsional vibration absorber (17) and a lock-up clutch (13) are additionally installed, wherein a first damper stage (14) and a second damper stage (15) are disposed between the lock-up clutch (13) and an output hub (12), the second damper stage (15) is disposed between the turbine (7) and the output hub (12) and the torsional vibration absorber (17) is parallel to both damper stages (14, 15)..].

.[.2. The hydrodynamic torque converter (1) according to claim 1, wherein an input part (41) of the first damper stage (14) and an output part (48) of the second damper stage (15) are centered on one another..].

.[.3. The hydrodynamic torque converter (1) according to claim 1, wherein a disk part (25) is allocated to two damper stages (14, 15) as one piece..].

.[.4. The hydrodynamic torque converter (1) according to claim 1, wherein the torsional vibration absorber (17) comprises a plurality of absorber masses (39), and a mounting part (37) of the torsional vibration absorber (17) forms a disk part (31) of an input part (35) of the second damper stage (15)..].

.[.5. The hydrodynamic torque converter (1) according to claim 1, wherein absorber masses (39) of the torsional vibration absorber (17) and energy accumulators (29) of the first damper stage (14) disposed over the circumference are radially at the same height but axially spaced apart..].

.[.6. The hydrodynamic torque converter (1) according to claim 5, wherein a middle mounting diameter of the energy accumulators (29) is disposed radially outside the turbine (7)..].

.[.7. The hydrodynamic torque converter (1) according to claim 5, wherein the energy accumulators (29) overlap the turbine (7) at least partially and axially..].

.[.8. The hydrodynamic torque converter (1) according to claim 1, wherein energy accumulators (27) are distributed over the circumference of the second damper stage (15) based on a middle mounting diameter radially within turbine blades (8) of the turbine (7)..].

.[.9. The hydrodynamic torque converter (1) according to claim 8, wherein the energy accumulators (27) of the second damper stage (15) and the turbine (7) at least partially and axially overlap..].

.[.10. The hydrodynamic torque converter (1) according to claim 1, wherein the lock-up clutch (13) in a closed state is axially mounted in a pocket (24) formed in a housing wall (23) radially inward of fastening means (9) provided on external part of the torque converter (1)..].

.[.11. The hydrodynamic torque converter (1) according to claim 10, wherein the lock-up clutch (13) is formed out of a piston (18) centered on the output hub (12) and mounted non-rotatably and axially displacably on the housing (3), and axially pressurizes a friction plate (22) that can be clamped between said piston and said housing (3) to develop a frictional engagement..].

.[.12. The hydrodynamic torque converter (1) according to claim 11, wherein a mounting part (37) of the torsional vibration absorber (17) is disposed axially between lock-up clutch (13) and the first damper stage (14)..].

.[.13. The hydrodynamic torque converter (1) according to claim 12, wherein between the friction plate (22) and an input part (41) of the first damper stage (14) transition connections (44) are formed, which reach through circular segment-shaped openings (47) of the mounting part (37)..].

.[.14. The hydrodynamic torque converter according to claim 1, wherein in the closed state of the lock-up clutch (13) the torsional vibration absorber (17) acts between both damper stages (14, 15)..].

.[.15. The hydrodynamic torque converter according to claim 1, wherein the torsional vibration absorber (17) is connected non-rotatably with the turbine (7)..].

.[.16. The hydrodynamic torque converter according to claim 15, wherein in the opened state of the lock-up clutch (13) the torsional vibration absorber (17) is connected non-rotatably with the turbine (7)..].

.Iadd.17. A hydrodynamic torque converter (1) with a turbine (7), driven by an impeller (6), as well as housing (3) in which a torsional vibration damper (16) with multiple damper stages (14, 15), a torsional vibration absorber (17) and a lock-up clutch (13) are additionally installed, wherein the torsional vibration absorber includes a centrifugal force pendulum, wherein a first damper stage (14) and a second damper stage (15) of the multiple damper stages are disposed between the lock-up clutch (13) and an output hub (12), the second damper stage (15) is disposed between the turbine (7) and the output hub (12) and the centrifugal force pendulum is connected to an interconnection between an output of the first damper stage and an input of the second damper stage so that the centrifugal force pendulum is parallel to both damper stages (14, 15), wherein the centrifugal force pendulum is connected non-rotatably relative to the turbine (7) and a disk part that forms the interconnection between the input part of the second damper stage and the output part of the first damper stage, wherein the centrifugal force pendulum comprises a plurality of absorber masses (39) and a mounting part (37), and wherein the mounting part forms part of the disk part with the input part (35) of the second damper stage (15)..Iaddend.

.Iadd.18. The hydrodynamic torque converter (1) according to claim 17, wherein the disk part that connects the first and second damper stages (14, 15) is a single piece..Iaddend.

.Iadd.19. The hydrodynamic torque converter (1) according to claim 17, wherein the torsional vibration damper comprises energy accumulators (29) for the first damper stage (14), and the absorber masses and the energy accumulators are disposed over a circumference radially at a same height and axially spaced apart..Iaddend.

.Iadd.20. The hydrodynamic torque converter (1) according to claim 17, wherein the mounting part (37) of the centrifugal force pendulum is disposed axially between the lock-up clutch (13) and the first damper stage (14)..Iaddend.

.Iadd.21. The hydrodynamic torque converter according to claim 17, wherein in a closed state of the lock-up clutch (13) torque flows through the first damper stage and the second damper stage such that the centrifugal force pendulum acts on both damper stages (14, 15), and wherein in an open state of the lockup clutch, torque flows through only the second damper stage such that the centrifugal force pendulum acts only on the second damper stage..Iaddend.

.Iadd.22. The hydrodynamic torque converter according to claim 17, wherein a further disk part connected to the disk part forms a mounting part of the centrifugal force pendulum..Iaddend.

.Iadd.23. The hydrodynamic torque converter according to claim 17, wherein the disk part forms at least an output of the first damper..Iaddend.

.Iadd.24. The hydrodynamic torque converter as recited in claim 17, wherein a limit stop for the second damper stage is provided on the disk part..Iaddend.

.Iadd.25. The hydrodynamic torque converter according to claim 17, further comprising a fastener fixing a portion of at least one of the first damper stage and the second damper stage to the turbine, wherein the absorber masses are positioned radially outside of the fastener, and the second damper stage includes energy accumulators positioned radially outside of the fastener..Iaddend.

.Iadd.26. The hydrodynamic torque converter according to claim 17, wherein the multiple damper stages include energy accumulators, the absorber masses extending radially outside of the energy accumulators..Iaddend.

.Iadd.27. A hydrodynamic torque converter (1) with a turbine (7) driven by an impeller (6) as well as housing (3) in which a torsional vibration damper (16) with multiple of damper stages (14, 15), a torsional vibration absorber (17) and a lock-up clutch (13) are additionally installed, wherein the torsional vibration absorber is a centrifugal force pendulum, wherein a first damper stage (14) and a second damper stage (15) of the multiple damper stages are disposed between the lock-up clutch (13) and an output hub (12), the second damper stage (15) is disposed between the turbine (7) and the output hub (12) and the centrifugal force pendulum is connected to an interconnection between an output part of the first damper stage and an input part of the second damper stage so that the centrifugal force pendulum is parallel to both damper stages (14, 15), the centrifugal force pendulum is connected non-rotatably relative to the turbine (7) and a disk part that forms part of the interconnection between the output part of the first damper stage and an input part of the second damper stage, and wherein a mounting part (37) of the centrifugal force pendulum is disposed axially between the lock-up clutch (13) and the first damper stage (14)..Iaddend.

.Iadd.28. The hydrodynamic torque converter according to claim 27, wherein the mounting part is connected to the disk part and a plurality of absorber masses movably mounted on the mounting part..Iaddend.

.Iadd.29. The hydrodynamic torque converter according to claim 28, wherein a further disk part forms the mounting part..Iaddend.

.Iadd.30. The hydrodynamic torque converter as recited in claim 29 wherein a limit stop for the first damper stage is provided on the further disk part..Iaddend.

.Iadd.31. The hydrodynamic torque converter according to claim 27, further comprising a fastener fixing a portion of at least one of the first damper stage and the second damper stage to the turbine, wherein the centrifugal force pendulum comprises masses positioned radially outside of the fastener, and the second damper stage includes energy accumulators positioned radially outside of the fastener..Iaddend.

.Iadd.32. The hydrodynamic torque converter according to claim 27, wherein the centrifugal force pendulum includes masses and the multiple damper stages include energy accumulators, the masses extending radially outside of the energy accumulators..Iaddend.

.Iadd.33. The hydrodynamic torque converter according to claim 27, wherein a further disk part forms the mounting part of the centrifugal force pendulum, and the disk part and the further disk part together form the input part of the second damper stage..Iaddend.

.Iadd.34. The hydrodynamic torque converter according to claim 27, wherein the mounting part of the centrifugal force pendulum forms a single piece with the disk part (31)..Iaddend.

.Iadd.35. The hydrodynamic torque converter according to claim 27, wherein the disk part forms an output part of the first damper stage, a further disk part forms the mounting part of the centrifugal force pendulum, and the disk part and the further disk part together form an input part of the second damper stage..Iaddend.

.Iadd.36. The hydrodynamic torque converter according to claim 27, wherein the disk part is a unitary structure..Iaddend.

.Iadd.37. A hydrodynamic torque converter (1) with a turbine (7) driven by an impeller (6) as well as housing (3) in which a torsional vibration damper (16) with multiple of damper stages (14, 15), a torsional vibration absorber (17) and a lock-up clutch (13) are additionally installed, wherein the torsional vibration absorber is a centrifugal force pendulum, wherein a first damper stage (14) and a second damper stage (15) of the multiple damper stages are disposed between the lock-up clutch (13) and an output hub (12), the second damper stage (15) is disposed between the turbine (7) and the output hub (12) and the centrifugal force pendulum is connected to an interconnection between an output of the first damper stage and an input of the second damper stage so that the centrifugal force pendulum is parallel to both damper stages (14, 15), wherein in a closed state of the lock-up clutch (13) torque flows through the first damper stage and the second damper stage such that the centrifugal force pendulum acts on both damper stages (14, 15), and wherein in an open state of the lockup clutch, torque flows through only the second damper stage such that the centrifugal force pendulum acts only on the second damper stage..Iaddend.

.Iadd.38. The hydrodynamic torque converter according to claim 37, wherein the torsional vibration damper includes a unitary disk part that forms the interconnection between the first damper stage and the second damper stage, and wherein the centrifugal force pendulum includes a mounting part connected to the disk part and a plurality of absorber masses movably mounted on the mounting part..Iaddend.

.Iadd.39. The hydrodynamic torque converter according to claim 38, wherein a further disk part forms the mounting part..Iaddend.

.Iadd.40. The hydrodynamic torque converter according to claim 38, further comprising a fastener fixing a portion of the first damper stage to the turbine, wherein the plurality of absorber masses are positioned radially outside of the fastener, and the second damper stage includes energy accumulators positioned radially outside of the fastener..Iaddend.

.Iadd.41. The hydrodynamic torque converter according to claim 38, wherein the multiple damper stages include energy accumulators, the absorber masses extending radially outside of the energy accumulators..Iaddend.

.Iadd.42. The hydrodynamic torque converter according to claim 41, wherein the disk part forms an output part of the first damper stage..Iaddend.

.Iadd.43. The hydrodynamic torque converter according to claim 38, wherein the mounting part comprises a further disk part, and the disk part and the further disk part together form the input part of the second damper stage..Iaddend.

.Iadd.44. A hydrodynamic torque converter (1) with a turbine (7) driven by an impeller (6) as well as housing (3) in which a torsional vibration damper (16) with multiple of damper stages (14, 15), a torsional vibration absorber (17) and a lock-up clutch (13) are additionally installed, wherein the torsional vibration absorber is a centrifugal force pendulum, wherein a first damper stage (14) and a second damper stage (15) of the multiple damper stages are disposed between the lock-up clutch (13) and an output hub (12), the second damper stage (15) is disposed between the turbine (7) and the output hub (12) and the centrifugal force pendulum is connected to an interconnection between an output of the first damper stage and an input of the second damper stage so that the centrifugal force pendulum is parallel to both damper stages (14, 15), wherein a limit stop for the first damper stage is provided on a disk part connected to the centrifugal force pendulum, wherein in a closed state of the lock-up clutch (13) torque flows through the first damper stage and the second damper stage such that the centrifugal force pendulum acts on both damper stages (14, 15), and wherein in an open state of the lockup clutch, torque flows through only the second damper stage such that the centrifugal force pendulum acts only on the second damper stage..Iaddend.

.Iadd.45. The hydrodynamic torque converter according to claim 44, wherein the centrifugal force pendulum includes a mounting part connected to the interconnection between the first damper stage and the second damper stage and a plurality of absorber masses movably mounted on the mounting part..Iaddend.

.Iadd.46. The hydrodynamic torque converter according to claim 45, wherein the disk part forms the mounting part..Iaddend.

.Iadd.47. The hydrodynamic torque converter according to claim 44, wherein the centrifugal force pendulum includes masses and the multiple damper stages include energy accumulators, the masses extending radially outside of the energy accumulators..Iaddend.

.Iadd.48. The hydrodynamic torque converter according to claim 44, wherein a mounting part of the centrifugal force pendulum forms a single piece with the disk part (31)..Iaddend.

.Iadd.49. The hydrodynamic torque converter according to claim 44, wherein the disk part is a unitary structure..Iaddend.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

(1) The invention is illustrated in detail based on the exemplary embodiment shown in the only FIGURE. This FIGURE shows a hydrodynamic torque converter disposed about a rotation axis in a half-sectional view.

(2) The FIGURE shows the hydrodynamic torque converter 1 in half-sectional view above the rotation axis 2. The housing 3 is formed out of the housing parts 4, 5, which are welded with one another after installation of internal parts. The impeller 6 is integrated inside the housing part 4, so that upon rotation of the housing 3 the turbine 7 with turbine blades 8 is driven by converter fluid inside the housing 3. The housing 3 is driven by an internal combustion engine—not depicted. For this purpose, fastening means 9 attached to the housing part 5, for instance welded with a rigid drive- or flex plate preferably axially elastic but rigid in circumferential direction, are rigidly connected with the crankshaft of the internal combustion engine, with the housing 3 after joining the torque converter mounted on the transmission and rigidly connected e.g. screwed with the internal combustion engine. A stator 10 is connected e.g. splined between an impeller 6 and turbine 7 via one-way clutch 11 with a transmission stub—not depicted.

(3) The output part of the torque converter 1 is formed by the output hub 12, which is connected e.g. splined non-rotatably with a transmission input shaft—not depicted. A lock-up clutch 13 is mounted inside the housing 3, which in the closed state transmits the torque from the internal combustion engine to the housing 3 via the damper stages 14, 15 into the output hub 12. When the lock-up clutch 13 is open, torque flows via the impeller 6 to the turbine and from there via the damper stage 15 into the output hub 12. For a slipping lockup clutch 13 partial torque can be transmitted via both torque paths.

(4) The lock-up clutch 13 is formed by a piston 18 rotatably mounted on the output hub 12, axially displaceable and sealed, which is connected non-rotatably with the housing by means of leaf springs 19. By adjusting a differential pressure between the two chambers 20, 21, piston 18 adjusts an axial force between itself and a housing wall 23, so that a frictional lock forms on the interposed friction plate 22 and the friction surfaces of the piston 18 and housing wall 23. The housing wall 23 is formed as an annular pocket 24 in which the piston 18 and the friction plate 22 are fully received axially when the lock-up clutch 13 is closed. Through formation of the lock-up clutch 13 with a two-sided friction plate, the latter can for the same torque capable of being transmitted be mounted on a diameter that radially lies within the fastening means 9, so that an accommodation neutral to the assembly space of the lock-up clutch 13 is necessary with respect of the axial assembly. The fastening means 9 can therefore be displaced axially towards the transmission for a specified radial diameter through tapering of the housing part 5, so that the connection to the flex plate can occur by reducing an axial distance apart.

(5) The torsional vibration damper 16 with the damper stages 14, 15 is designed as a multi-function damper. The two damper stages 14, 15 are connected with one another by a single-piece disk part 25 assigned to the damper stages 14, 15, which is centered rotatably radially inside on the output hub 12. Radially outside is the turbine shell of the turbine 7 connected with the disk part 25 by fastening means 26 e.g. rivets. Radially outside the fastening means 26, for instance, the energy accumulators 27, of the damper stage 15, formed as coil springs distributed over the circumference, are mounted in window-shaped recesses 28, which support the energy accumulators through correspondingly formed-parts against the centrifugal force effect. On the external circumference of the disk part 25 are energy accumulators 29 of the damper stage 14 mounted and supported against centrifugal force. For this, the disk part 25 features formed-parts 30, which surround the energy accumulators 29 radially. The disk part 25 thereby forms the complete output part 34 of the damper stage 14, whereas the disk part 25 in the damper stage 15 forms a part of the input parts 35, which is completed by a second disk part 31 with corresponding window-shaped recesses 32. The two disk parts 25, 31 are axially spaced relative to one another by means of the rivets 33 and rigidly connected and accommodate the flange part 36, which is rigidly connected e.g. welded or formed as one piece with the output hub 12. To ensure the rotating ability of the flange part 36, acting as output part 48 of both damper stages 14, 15, with respect to the input part 35 of the damper stage 15, circular segment shaped cutouts 49 are provided in the flange part 36, whereby after consumption of the rotational clearance the rivets 33 strike on the cutouts and the torque from the output part 34 of the damper stage 14 is transmitted to the flange part 36 and from there to the output hub 12.

(6) In radial extension, the disk part 31 in a single-piece manner forms the mounting part 37 of the torsional vibration absorber 17, which, through this design, forms a centrifugal force pendulum 38, in that on both sides of the mounting part 37 absorber masses 39 spaced axially apart are distributed over the circumference, which are connected with one another by means of rivets 40 and are guided in circumferential direction and in radially extending raceways—not visible in detail. Between the rivets 40 and the raceways, a bearing such as plain or roller bearing can be provided. Through the single-piece connection of the mounting part 37 with the input part 35 of the damper stage 15 and the output part 34 of the damper stage 15 by means of the rivets 33 is the centrifugal force pendulum 38 assigned parallel to both damper stages.

(7) The input part 41 of the damper stage 14 is formed by a ring part 42, which is centered on a centering circumference 43 of the flange part 36 and is permanently connected by means of transmission connections 44 like rivets with a ring gear 45, which forms a tooth system with an external teeth 46 of the friction plate 22. During assembly of both housing parts 4, 5, the tooth system is formed between the friction plate preassembled in the housing part 5 and the ring gear 45 preassembled in the housing part 4.

(8) To ensure that the mounting part 37 or disk parts 31 is rotatable, circular segment-shaped openings 47 are provided in said part, through which the transmission connections 44 are guided.

(9) For further reduction of the axial assembly space are energy accumulators 29 disposed radially outside the turbine 7 and surround said turbine at least partially axially. The energy accumulators 27 are brought closer to the turbine 7 in the tapered area between turbine blades 8 and the fastening on the disk part 25. The carrier masses 39 are closely spaced axially to the energy accumulators 29 radially disposed outside the lock-up clutch 13.

(10) The functioning manner of the torsional vibration damper 16 is differentiated in the state with actuated and non-actuated lock-up clutch 13. If this is opened then the damper stage 14 is out of operation because the input part 41 is essentially without load. The torque flows from the turbine 7 into the damper stage 15 via the input part 35 and the energy accumulators 27 into the output part 48 as flange part 36 and from there via the output hub 12 into the transmission input shaft.

(11) When lock-up clutch 13 is actuated, the torque is introduced via the frictional plate 22, the gearing and the transmission connections 44 in the input part 41. The input part 41 pressurizes the energy accumulators 29, which can be arc springs, and said transmit the torque after consuming the rotary clearance of the cutouts 49 by means of limit stopped rivets 33, the torque to the common output part 48 acting as flange part 36 and from there via the output hub 12 on the transmission input shaft. The energy accumulators 27 are preferably designed with stiffness, such that the torque transmitted through said stiffness does not lead to consumption of the rotary clearance and torque peaks are damped through the elastic properties of the energy accumulators. Thereby, the centrifugal force pendulum 38 is active in a particularly advantageous manner, so that in the elastic operating range of both damper stages 14, 15, they are additionally active in vibration damping.

LIST OF REFERENCE SYMBOLS

(12) 1 hydrodynamic torque converter 2 rotation axis 3 housing 4 housing part 5 housing part 6 impeller 7 turbine 8 turbine blade 9 fastening means 10 stator 11 one way clutch 12 output hub 13 lock-up clutch 14 damper stage 15 damper stage 16 torsional vibration damper 17 torsional vibration absorber 18 piston 19 leaf spring 20 chamber 21 chamber 22 friction plate 23 housing wall 24 pocket 25 disk part 26 fastening means 27 energy accumulator 28 recess 29 energy accumulator 30 formed-part 31 disk part 32 recess 33 rivet 34 output part 35 input part 36 flange part 37 mounting part 38 centrifugal force pendulum 39 absorber mass 40 rivet 41 input part 42 ring part 43 centering circumference 44 transmission connection 45 ring gear 46 external teeth 47 opening 48 output part 49 cutout