Hydrodynamic torque converter and torsional vibration damper for same

Abstract

A hydrodynamic torque converter and a torsional vibration damper for same, having a pump wheel connected on the drive side and a turbine wheel driven thereby, wherein a torsional vibration damper and an output part are provided between a housing of the hydrodynamic torque converter and an output hub. The torsional vibration damper having an input part that can be connected to the housing by a converter lock-up clutch, and said output part being connected to the output hub, wherein an intermediate flange arranged in each case counter to a spring device effective in the circumferential direction is provided between the input part and the output part. In order to protect the spring devices against damage in a manner not affecting the installation space, an angle of rotation of the intermediate flange counter to the effect of the spring devices is limited radially inside the spring.

Claims

1. A hydrodynamic torque converter comprising: a pump wheel connected on a drive side and a turbine wheel driven thereby, wherein a torsional vibration damper and an output part are provided between a housing of the hydrodynamic torque converter and an output hub, said torsional vibration damper having an input part that can be connected to the housing by a converter lock-up clutch, and said output part being connected to the output hub, wherein an intermediate flange arranged in each case counter to spring devices effective in a circumferential direction is provided between the input part and the output part, wherein an angle of rotation of the intermediate flange counter to the effect of the spring devices is limited radially inside the spring devices.

2. The hydrodynamic torque converter according to claim 1, wherein the spring devices are each formed from linearly designed helical compression springs, distributed over a circumference.

3. The hydrodynamic torque converter according to claim 2, wherein the helical compression springs of the two spring devices are arranged alternately over the circumference.

4. The hydrodynamic torque converter according to claim 1, wherein the intermediate flange is formed from two axially spaced, interconnected lateral parts, which receive the input part and the output part therebetween.

5. The hydrodynamic torque converter according to claim 4, wherein the input part is centered on the output hub and the output part is connected for conjoint rotation with the output hub.

6. The hydrodynamic torque converter according to claim 5, wherein one of the disk parts engages in an axially opposite opening of an output part of the converter lock-up clutch by at least one axially flared tab with torsional play.

7. The hydrodynamic torque converter according to claim 6, wherein the output part is designed as a plate carrier of the converter lock-up clutch.

8. The hydrodynamic torque converter according to claim 4, wherein at least one lateral part of the intermediate flange is centered with torsional play and rotatably received along the torsional play on the output hub.

9. The hydrodynamic torque converter according to claim 8, wherein the output hub has radially widened cams distributed over a circumference, which engage with torsional play in recesses recessed on an inner circumference of the at least one lateral part.

10. A torsional vibration damper, in particular for a hydrodynamic torque converter, comprising: an input part and an output part and an intermediate flange, wherein the input part, the intermediate flange and the output part are arranged in series by spring devices effective in a circumferential direction, wherein the input part and the output part are designed as axially adjacent disk parts, which are arranged between two axially spaced and interconnected lateral parts of the intermediate flame, wherein an angle of rotation of the intermediate flange counter to the effect of the spring devices is limited radially inside the spring devices.

11. The torsional vibration damper according to claim 10, wherein the spring devices are helical compression springs arranged alternately over a circumference.

12. The torsional vibration damper according to claim 10, wherein the input part is centered on an output hub.

13. The torsional vibration damper according to claim 10, wherein one of the disk parts engages in an axially opposite opening of an output part of a converter lock-up clutch by at least one axially flared tab.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The disclosure is explained in more detail with reference to the exemplary embodiment shown in FIGS. 1 to 5. In the figures:

[0022] FIG. 1 shows the upper part of a torsional vibration damper arranged to be rotatable about a rotational axis, in section,

[0023] FIG. 2 shows a partial view of the torsional vibration damper from FIG. 1,

[0024] FIG. 3 shows a detail of the torsional vibration damper from FIGS. 1 and 2 in the region of the output hub,

[0025] FIG. 4 shows a detail of the torsional vibration damper from FIGS. 1 and 2 in the region of the plate carrier, and

[0026] FIG. 5 shows a detail of the torsional vibration damper of FIGS. 1 and 2 in the region of the stop between the input part and the intermediate flange.

DETAILED DESCRIPTION

[0027] FIG. 1 shows the upper part of the torsional vibration damper 1 of a hydrodynamic torque converter (not shown in detail), which can be rotated about the rotational axis d, in section. The input part 2 is connected to the output-side plate carrier 3 of a converter bridging clutch arranged between a housing of the hydrodynamic torque converter and its output hub 4 by means of the rivets 5 distributed over the circumference. The input part 2 and the plate carrier 3 are received in a rotatable centered manner on the output hub 4. The output part 6 is connected in a non-rotatable manner to the output hub 4, for example welded. The input part 2 and output part 6 are designed as disk parts 7, 8 arranged parallel to one another. The disk part 7 is axially fixed and rotatably received by means of the annular rim 9 of the output hub 4 and is centered on the output hub 4. The disk part 8 is held in a non-rotatable manner on the annular rim 9 on the output hub 4, for example welded thereto.

[0028] The intermediate flange 10 is formed from the two axially spaced lateral parts 12, 13 connected to one another by means of the spacer bolts 11. The disk parts 7, 8 are axially received between the lateral parts 12, 13 of the intermediate flange 10. The lateral part 12 facing the converter bridging clutch is recessed radially on the inside in order to enable the connection of the plate carrier 3 to the input part 2. Tabs 14 exposed from the lateral part 12 grip axially with torsional play into the axially opposite openings 15 and thus limit the angle of rotation between the intermediate flange 10 and the input part 2.

[0029] The lateral parts 12, 13 form the pendulum mass carrier of the centrifugal pendulum 37 received on the intermediate flange 10 and receive the pendulum masses 16, which are made up of, for example, riveted sheet metal disks that are distributed over the circumference. The pendulum masses 16 are suspended by means of pendulum bearings (not shown) on the pendulum mass carrier in the centrifugal force field of the torsional vibration damper 1 rotating about the rotational axis d so that they can swing along a predetermined pendulum path. The spacer bolts 11 have stop buffers 17 to delimit the oscillation angle of the pendulum masses 16.

[0030] Spring devices 18, 19 are effective between the input part 2, the intermediate flange 10 and the output part 6. The spring devices 18, 19 are arranged in series, i.e., when the input part 2 is rotated relative to the output part 6 about the rotational axis d, depending on the direction of the applied torque, that between the input part 2 and the intermediate flange 10 and that between the intermediate flange 10 and spring devices 18, 19 effectively arranged on the output part 6 are loaded in series.

[0031] The spring devices 18, 19 are formed from linear helical compression springs 20, 21 which are distributed over the circumference and are arranged on essentially the same diameter.

[0032] The thrust washer 22, made in particular of plastic and suspended in a non-rotatable manner in the lateral part 13, delimits the axial play of the intermediate flange 10. The intermediate flange 10 is received by means of the lateral part 13 on the output hub 4 with limited torsional play and is centered. For this purpose, radially extended cams 23 are provided on the output hub 4 distributed over the circumference, which engage in recesses 24 with torsional play provided over the circumference on the inner circumference of the lateral part 13 and limit the angle of rotation of the intermediate flange 10 with respect to the output part 6 of the torsional vibration damper.

[0033] By means of the stops 25, 26 for limiting the angle of rotation by means of the tabs 14 and the openings 15 on the input side and the cams 23 and recesses 24, the angle of rotation of the intermediate flange 10 relative to the input part 2 or the output part 6 is limited, for example, to ±15° in such a way that a block position of the helical compression springs 20, 21 is avoided and damage caused thereby is excluded.

[0034] The stops 25, 26 for limiting the angle of rotation of the intermediate flange 10 are provided radially inside the spring devices 18, 19, so that the installation space outside the spring devices 18, 19 can be kept free for the dimensioning of the pendulum masses 16 and these can be provided with increased mass and/or increased oscillation angle in relation to stops arranged radially outside of the spring devices 18, 19 to limit the angle of rotation of the intermediate flange 10.

[0035] The input-side and output-side loading of the helical compression springs 20, 21 takes place by means of the radially expanded loading regions 27, 28 each in the center of the cross section of the end faces of the helical compression springs, wherein the loading regions 27, 28 of the disk parts 7, 8 each overlap in the loading direction on the disk parts 7, 8. At the loading regions 28, the lug 29, which is extended in the loading direction and engages in the interior of the helical compression springs 20, 21, is provided in order to hold down the end faces of the helical compression springs 20, 21 radially. Against the radial deflection of the helical compression springs, in particular at their end turns, the disk part 7 has projections 30 that extend the helical compression springs 20, 21 in the circumferential direction and partially overlap in the radial direction.

[0036] FIG. 2 shows the torsional vibration damper 1 of FIG. 1 in a partial view with the front lateral part removed with the helical compression springs 20, 21 of the spring devices 18, 19 alternately accommodated in the spring windows 31, 32 over the circumference. The loading of the helical compression springs 20, 21 provided in both directions of rotation of the intermediate flange 10 takes place by means of the radial walls 33, 34 of the spring windows 31, 32. The radial support of the helical compression springs 20, 21 takes place on the input side radially on the outside by means of the projections 30 of the disk part 7 and on the output side radially inside by means of the lugs 29 of the disk part 8.

[0037] Immediately radially outside of the helical compression springs 20, 21, the pendulum masses 16 of the centrifugal pendulum 37 are suspended in a pendulum-capable manner by means of the pendulum bearings 35 on the lateral parts 12 (FIG. 1), 13 in the centrifugal force field of the torsional vibration damper 1 rotating about the rotational axis d along a pendulum path specified by the pendulum bearings 35. As a result of the stops 25, 26 (FIG. 1) radially inside the spring devices 18, 19, the installation space radially outside the spring devices 18, 19 can be used exclusively for the pendulum masses 16 and their oscillation angle requirements. Recesses 36 are only provided for the spacer bolts 11. Some of the spacer bolts 11, here to limit the circumferential movement of the pendulum masses 16, have stop buffers 17.

[0038] FIG. 3 shows a detail of the torsional vibration damper 1 in the region of the output hub 4 with the stop 26 for limiting the angle of rotation between the intermediate flange 10 and the output part 6 (FIG. 1). The output hub 4, which is firmly connected to the output part and is welded, has three radially expanded cams 23 distributed over the circumference, which extend with torsional play into the recesses 24 provided on the inner circumference of the lateral part 13 of the intermediate flange 10. The torsional play that results between the cams 23 and recesses 24 enables an angle of rotation of the intermediate flange with respect to the output hub 4 and thus the output part 6 (FIG. 1) within the scope of the working range of the helical compression springs 20, 21 (FIG. 1) with a limitation before reaching their block position.

[0039] FIG. 4 shows a detail of the torsional vibration damper 1 in the region of the stop 25 between the plate carrier 3 and the lateral part 12 of the intermediate flange 10. Due to the riveting of the disk part 7 of the input part 2 to the plate carrier 3 by means of the rivet 5, the stop 25 between the input part 2 and the intermediate flange 10 is effective and limits the torsional play on the input side before the helical compression springs 20, 21 reach a block position. For this purpose, tabs 14 are axially issued from the lateral part 12 of the intermediate flange 10 and are distributed over the circumference and engage with the openings 15 of the plate carrier 3 with torsional play.

[0040] FIG. 5 shows a detail of the torsional vibration damper 1 from the perspective of the plate carrier 3 with the tab 14 of the lateral part 12 engaging in the opening 15 of the plate carrier 3 with torsional play (FIG. 1).

LIST OF REFERENCE NUMBERS

[0041] 1 Torsional vibration damper

[0042] 2 Input part

[0043] 3 Plate carrier

[0044] 4 Output hub

[0045] 5 Rivet

[0046] 6 Output part

[0047] 7 Disk part

[0048] 8 Disk part

[0049] 9 Annular rim

[0050] 10 Intermediate flange

[0051] 11 Spacer bolt

[0052] 12 Lateral part

[0053] 13 Lateral part

[0054] 14 Tab

[0055] 15 Opening

[0056] 16 Pendulum mass

[0057] 17 Stop buffer

[0058] 18 Spring device

[0059] 19 Spring device

[0060] 20 Helical compression spring

[0061] 21 Helical compression spring

[0062] 22 Thrust washer

[0063] 23 Cams

[0064] 24 Recess

[0065] 25 Stop

[0066] 26 Stop

[0067] 27 Loading region

[0068] 28 Loading region

[0069] 29 Lug

[0070] 30 Projection

[0071] 31 Spring window

[0072] 32 Spring window

[0073] 33 Wall

[0074] 34 Wall

[0075] 35 Pendulum bearing

[0076] 36 Recess

[0077] 37 Centrifugal pendulum

[0078] d Rotational axis