DE102017123579A1 - Flange assembly for a dual mass flywheel - Google Patents

Abstract

A flange arrangement (10) for a dual-mass flywheel (14) is provided with an output flange (16) for transmitting a torque, at least one circumferentially extending guide groove (26) formed in the output flange (16), at least one in the guide groove (26). guided guide pin (28) for transmitting the torque of the output flange (16) to a secondary pulley (42), with the guide pin (28) fixed cover plate (30) for surface coverage of a portion of an axial side of the output flange (16) and a cover plate ( 30) axially biasing spring element (34) for providing a frictional force on the output flange (16) via the cover plate (30). By guided in the guide groove (26) of the Ausgangsflanschs (16) guide pin (28) on the one hand via the tailed cover plate (30) a resonance effects damping friction and on the other hand in a striking in the guide groove (26) a positive torque transmission can be achieved without significant friction losses so that with low space requirements a vibration damped drive train of a motor vehicle with a high efficiency is possible.

Description

The invention relates to a flange assembly for a dual-mass flywheel, with the aid of which a torque of a dual-mass flywheel can be transmitted vibration-damped within a drive train of a motor vehicle.

For example DE 10 2008 004 150 A1 a dual-mass flywheel is known in which the torsional vibration damping of a drive shaft of a motor vehicle internal combustion engine, a primary mass is coupled via a bow spring with a rotatable relative to the primary mass secondary mass. The bow spring is arranged in a bow spring channel, wherein a channel wall of the bow spring channel is formed by the primary mass. In the bow spring channel protrudes an output flange of the secondary mass, via which the introduced torque of the drive shaft vibration damping can be discharged to a friction clutch for coupling a transmission input shaft of a motor vehicle transmission.

There is a constant need to be able to damp torsional vibrations in a drive train of a motor vehicle.

It is the object of the invention to show measures that enable a vibration-damped drive train of a motor vehicle.

The object is achieved according to the invention by a flange arrangement having the features of claim 1. Preferred embodiments of the invention are specified in the subclaims and the following description, which individually or in combination may represent an aspect of the invention.

According to the invention, a flange assembly for a dual mass flywheel is provided with an output flange for transmitting a torque, at least one formed in the output flange in the circumferential direction guide groove, at least one guided in the guide groove guide pin for transmitting the torque of the output flange to a secondary disc, a cover plate attached to the guide pin for surface covering a part of an axial side of the output flange and a cover member in the axial direction biasing spring element for providing a frictional force to the output flange on the cover plate.

A provided for torsional vibration damping in a drive train dual-mass flywheel, a primary mass and a configured in particular as a bow spring energy storage element limited relatively rotatably coupled secondary mass, wherein the secondary mass may have the flange, which makes up a portion of the moment of inertia of the secondary mass. The flange assembly itself in turn has relatively movable components that can be functionalized to a vibration damping and form a further vibration damping stage. The torque flow via the flange arrangement in this case takes place from the output flange via the frictionally engaged and / or positively connected guide bolt in order to couple a motor vehicle engine, in particular via a clutch, to a motor vehicle transmission. Since the guide pin is connected to the cover plate, which can provide a frictional force by means of the spring element, a deliberate friction can be impressed upon a relative movement of the guide pin within the guide groove. This friction provides a damping component that can dampen a resonance-induced rocking of the relative movements of the secondary mass to the primary mass of the dual-mass flywheel. In this case, the knowledge is exploited that in the case of resonance, the amplitude of oscillation of the secondary mass would rise, which also results in a relative movement of the output flange to the guide pin and frictionally connected cover plate and then the resonant rocking can be damped by the then attacking friction. At low and less sudden oscillation amplitudes of the secondary mass of the frictional engagement with the cover plate and / or a positive connection of the guide pin at one of the circumferentially facing ends of the guide can be sufficient without significant friction losses to transmit the applied torque vibration damped. Unnecessary power losses due to the vibration damping can be avoided. This allows, in particular, a good starting behavior of the motor vehicle when, during a start, in particular after a start / stop situation, a resonant region of the dual mass flywheel is traversed. In addition, resonance-induced rocking can also be avoided in a drive train with a motor vehicle engine having a low number of cylinders, in particular three or fewer cylinders, in which a suitable design of the energy storage element of the dual-mass flywheel may be difficult given space requirements. Compared to a friction clutch designed as a friction clutch engaging the output flange, the guide pin guided in the guide groove can define a maximum relative twist angle at which torque can be transmitted without significant friction losses between the output flange and the guide pin. As a result, for example, a very high moment of resistance when turning a transmission input shaft from the state without permanent slip can be achieved with low power losses. It can be configured in a small space a Startinnendämpfer, which can provide additional damping in a starting situation of the motor vehicle. By guided in the guide groove of the output flange guide pin on the tailed cover a resonance effects damping friction and on the other hand in a striking in the guide groove a positive torque transmission without significant friction losses can be achieved so that with low space requirement a vibration damped drive train of a motor vehicle with a high efficiency is possible.

The cover plate may be captive with the guide pin in the axial direction and / or rotatably connected. For example, the cover plate is screwed to the guide pin, welded and / or riveted, in particular by a plastic deformation of the guide pin. The spring element can act directly or indirectly, in particular indirectly via the guide pin, on the cover disk in order to press the cover disk against the output flange on an axial side facing the output flange. The spring element can exert a compressive force or a tensile force for this purpose. The spring element is in this case supported in particular on the guide pin or a component connected to the guide pin. For example, the cover plate can be displaced axially by the spring element relative to the guide pin. It is also possible that the spring element axially displaces the cover plate together with the guide pin relative to the component connected to the guide pin. The spring element may additionally or alternatively be supported on a component which is co-rotating with the guide pin and / or with the cover plate and which is axially displaceable relative to the guide pin and / or with the cover plate, for example a further cover plate provided on the other axial side of the output flange. It is also possible that the spring element is relatively rotatably supported via a sliding surface on the output flange or a component connected to the output flange, for example a sliding ring. In particular, the guide pin with fit, in particular clearance, used in the guide, so that the guide pin or provided with the guide pin for torque transmission component of the secondary mass can be centered relative to the output flange. Preferably, the guide groove is punched out of the output flange. The output flange may have stops over which the output flange for torque transmission to the energy storage element of the dual mass flywheel can attack.

In particular, with the guide pin, a further cover plate for providing a frictional force to the output flange by means of the spring element attached, wherein the output flange is arranged in the axial direction between the cover plate and the other cover plate. As a result, a frictional force can act on both axial sides of the output flange facing away from one another, as a result of which the damping effect can be increased. For this purpose, in particular only exactly one spring element is provided, which can reduce the axial distance of the cover plate to another cover plate, for example, to clamp the output flange between the cover plate and the other cover plate with a suitable spring force corresponding to the spring element of the normal force by their impressed spring force.

Vorzugseise the guide pin is designed as a stepped bolt with at least one axial bearing surface for the cover plate and / or the other cover plate, in particular, the guide pin is plastically deformed at its axial ends to form a rivet head. The stepped bolt can be received in an axial region with a larger diameter in the guide groove, wherein the cover plate and / or the further cover plate can be attached to an axial region axially projecting from this axial region with a smaller diameter. At the diameter jump between the axial regions with the different diameters, a step may result, the axial side of which can be used as a contact surface for the cover plate or the further cover plate. The axial relative position, in particular a minimum axial distance of the cover disk to the other cover disk, can be defined thereby. In this case, the cover disk or the further cover disk can be easily riveted to the guide pin, while preferably the other cover disk can be guided axially displaceably on the guide pin. It is also possible to rivet the cover disc and the further cover disc immovably with the guide pin and to displace at least one friction ring relative to the cover plates by means of the spring element axially in order to impart a frictional force supported on the cover plates for clamping the output flange can.

Particularly preferably, the guide pin is indirectly or directly attached rotatably to the secondary disc, wherein in particular the secondary disc has an axial friction surface for a friction clutch. If appropriate, the flange arrangement and the secondary disk, together with a driving ring connecting the flange arrangement with the secondary disk, can at least reduce the mass moment of inertia of the secondary mass of the dual mass flywheel predominantly determine. The shape design and / or the mass of the secondary pulley can be provided in particular for achieving a certain mass moment of inertia of the secondary mass of the dual mass flywheel. If necessary, the secondary pulley for this purpose have at least one firmly attached additional mass. In particular, a friction clutch can be connected directly to the flange arrangement, so that the secondary disk itself can already form a friction surface for the friction clutch as part of the friction clutch.

In particular, the frictional force applied by the cover disk and / or the further cover disk acts on a friction ring, in particular connected non-rotatably to the output flange. The friction ring can provide a higher coefficient of friction compared to a steel / steel contact, which can increase the damping effect. The friction ring may be connected to the output flange or to the cover disk or the further cover disk. Alternatively, the friction ring can be freely rotatable relative to the output flange and the cover disk or the further cover disk and bring about a frictional contact on its two axial sides.

Preferably, the spring element is designed as a plate spring, wherein the spring element is directly or indirectly coupled in motion via a projecting with a proportion in the axial direction driver lug with the cover plate. The spring element can thereby provide a comparatively high spring force with a very small axial space requirement. By projecting, for example, from the radially inner edge of the force or radially outer edge force Mitnehmeransatz the spring element can rotate substantially without significant relative movement with the speed of the covers, so that unnecessary wear of the spring element can be avoided by friction effects.

Particularly preferably, the cover plate is coupled rotatably relative to the output flange via a damper spring, wherein in particular the damper spring is tangentially supported in a damper window of the cover plate and in a flange window of the output flange. The cover plate can be resiliently coupled to the output flange comparable to a disc damper. As a result, a further torsional vibration damping comparable to the principle of the dual mass flywheel may be made possible, the vibration damping region of which is set in particular on torsional vibrations occurring during an engine start. In addition, can be avoided or at least damped by the damper spring hard abutment of the guide pin at a tangential end of the guide. In particular, a first damper spring designed in particular as a compression spring is provided for damping a relative movement in a first circumferential direction and a second damper spring designed in particular as a compression spring for damping a relative movement in a second circumferential direction opposite to the first circumferential direction. The damper spring may in particular be designed as a helical spring whose diameter is so great that the damper spring can strike in the tangential direction on an edge of the damper window of the cover plate and an edge of the flange of the output flange, when the damper spring is compressed in a relative rotation of the cover plate to the output flange ,

In particular, with the output flange at least one relative to the output flange, in particular pendulum, pendulum pendulum mass for generating a rotational nonuniformity in the rotational speed of the Ausgangsflanschs opposing return torque coupled to form a centrifugal pendulum, wherein the cover plate and / or the further cover plate in one of the Pendulum mass covered axial region is arranged radially inside the pendulum mass. The output flange can thereby simultaneously form a carrier flange for a centrifugal pendulum. The pendulum mass can contribute to the moment of inertia of the secondary mass of the dual mass flywheel and provide additional torsional vibration damping according to the principle of centrifugal pendulum. The damping of torsional vibrations in the speed of the output flange can be improved.

The at least one pendulum mass of the centrifugal pendulum, under the influence of centrifugal force, endeavors to assume a position as far away as possible from the center of rotation. The "zero position" is thus the radially furthest from the center of rotation remote position, which can take the pendulum mass in the radially outer position. At a constant input speed and constant drive torque, the pendulum mass will assume this radially outer position. In the case of speed fluctuations, the pendulum mass deflects along its pendulum track due to its inertia. The pendulum mass can be moved in the direction of the center of rotation. The centrifugal force acting on the pendulum mass is thereby divided into one component tangentially and another component normal to the pendulum track. The tangential force component provides the restoring force which the pendulum mass wants to bring back into its "zero position", while the normal force component acts on a force introduction element introducing the speed fluctuations, in particular a flywheel connected to the drive shaft of the motor vehicle engine, and there Generates counter-torque, which counteracts the speed fluctuation and dampens the introduced speed fluctuations. For particularly high speed fluctuations, the pendulum mass can thus be maximally swung and assume the radially innermost position. For this purpose, the paths provided in the carrier flange and / or in the pendulum mass have suitable curvatures. In particular, more than one pendulum mass is provided. In particular, several pendulum masses can be distributed uniformly in the circumferential direction. The inert mass of the pendulum mass and / or the relative movement of the pendulum mass to the support flange is designed in particular for damping a specific frequency range of rotational irregularities, in particular an engine order of the motor vehicle engine. In particular, more than one pendulum mass and / or more than one support flange is provided. For example, the support flange is arranged between two pendulum masses. Alternatively, the pendulum mass can be accommodated between two flange parts of the support flange, wherein the flange parts are connected to each other in a Y-shape, for example.

Preferably, the output flange has a circumferentially continuous flange ring with a radial width b, wherein the cover plate and / or the further cover plate covers a radial extent e of the flange and 0.05 ≤ e / b ≤ 0.75, in particular 0.10 ≤ e / b ≤ 0.50, preferably 0.15 ≤ e / b ≤ 0.35, and particularly preferably 0.20 ≤ e / b ≤ 0.25, wherein in particular the cover disk and / or the further cover disk, the output flange to the radially inner edge of the flange covered. From the flange can protrude a Flanschansatz, which can protrude into a form of a primary mass receiving channel for receiving an energy storage element, in particular bow spring, to be able to strike tangentially for transmitting torque to the energy storage element can. The flange approach is not considered as part of the continuous flange in the circumferential direction. Since the cover disc covers only a comparable small radial portion of the flange, remains, in particular radially outward to the cover plate, sufficient space to provide a pendulum on the output pendulum guided pendulum mass to form a centrifugal pendulum. The pendulum mass and the cover plate can cover at least partially viewed in the radial direction, so that a small space requirement can be achieved in the axial direction.

Particularly preferably, the extent of the guide groove in the circumferential direction for the at least one guide pin inserted in the guide groove forms a maximum relative angle of rotation α of 5 ° ≦ α ≦ 40 °, in particular 10 ° ≦ α ≦ 30 ° and preferably α ≦ 20 ° ± 3 ° , The angle of rotation relates to the angle range which can be crossed over between two extreme positions. Such an angle of rotation is sufficient to provide a sufficient frictional damping at a start of an automotive engine with three or vinous cylinders, which can prevent resonance-induced rocking or at least sufficient damping.

The invention further relates to a dual mass flywheel for torsional vibration damping between a drive shaft of an automotive engine and a transmission input shaft of a motor vehicle transmission, with a primary mass for introducing a torque, a relatively limited to primary mass rotatable secondary mass for discharging the torque and an attackable on the primary mass and the secondary mass energy storage element, in particular bow spring, for transmitting the torque, wherein the secondary mass a flange assembly, which may be as described above and further educated comprises. By guided in the guide groove of the output flange guide pin on the tailed cover a resonance effects damping friction and on the other hand in a striking in the guide groove a positive torque transmission without significant friction losses can be achieved so that with low space requirement a vibration damped drive train of a motor vehicle with a high efficiency is possible.

The primary mass and connected via the energy storage element secondary mass form a spring-mass system that can dampen torsional vibrations in the speed of the drive shaft of the motor vehicle engine. For this purpose, the primary mass, for example, be connected to the drive shaft and thereby rotate with the rotational irregularities exposed speed of the drive shaft. In particular, the primary mass can strike via a stop, for example an impression, in the tangential direction and / or in the circumferential direction at a first end of the energy storage element in order to be able to transmit torque to the secondary mass via the preferably elastically compressible energy storage element. The secondary mass can have an output flange which can strike in the tangential direction and / or in the circumferential direction at a second end of the energy storage element to discharge the torque introduced into the torsional vibration damper and forward to a transmission input shaft of a motor vehicle transmission optionally via an intermediate clutch unit, in particular a friction clutch can. The spring action of the energy storage element and the moment of inertia of the primary mass and the secondary mass are preferably designed to attenuate a certain frequency range, in particular an engine order of the motor vehicle engine. For this purpose, an additional mass can be attached to the primary mass and / or to the secondary mass.

• 1: eine schematische Draufsicht auf eine erste Ausführungsform einer Flanschanordnung für ein Zweimassenschwungrad,
• 2: eine schematische Schnittansicht der Flanschanordnung aus 1,
• 3: eine schematische Detailansicht der Flanschanordnung aus 2,
• 4: eine schematische Draufsicht auf eine zweite Ausführungsform einer Flanschanordnung für ein Zweimassenschwungrad,
• 5: eine schematische Schnittansicht der Flanschanordnung aus 4 und
• 6: eine schematische Detailansicht der Flanschanordnung aus 5.

The invention will now be described by way of example with reference to the accompanying drawings with reference to preferred embodiments, wherein the features shown below, both individually and in combination may represent an aspect of the invention. Show it:

• 1 FIG. 2 is a schematic plan view of a first embodiment of a flange arrangement for a dual-mass flywheel. FIG.
• 2 a schematic sectional view of the flange of 1 .
• 3 : A schematic detail view of the flange from 2 .
• 4 FIG. 2 is a schematic plan view of a second embodiment of a flange assembly for a dual-mass flywheel. FIG.
• 5 a schematic sectional view of the flange of 4 and
• 6 : A schematic detail view of the flange from 5 ,

In the 1 illustrated flange assembly 10 that part of a secondary mass 12 a dual mass flywheel 14 can have, has a starting flange 16 on. The output flange 16 has an annular flange ring 18 with a radial width b on, from the flange lugs 20 protrude radially outward. In a radially outer area of the flange ring 18 of the output flange 16 are pendulum masses 22 pendulum mounted guided, which in each case a centrifugal pendulum 24 with the output flange 16 as carrier flange of centrifugal pendulum 24 is trained. Radial within the pendulum masses 22 are in the flange ring 18 of the output flange 16 designed as a passage opening part circular guide grooves 26 provided, in each of which at least one guide pin 28 is guided. A maximum angle of rotation of the guide pin 28 in the associated guide groove 26 is by a tangential striking one of the in the guide groove 26 used guide pin 28 limited.

As in particular in 2 can be seen, is the guide pin 28 designed as a stepped bolt, with a cover plate 30 and another cover disk 32 riveted, between which the output flange 16 is arranged. The cover disk 30 and the other cover disk 32 each have a radial extent e on the radially inside of the pendulum masses 22 a large part of the flange ring 18 cover. In the example shown is designed as a plate spring spring element 34 via a driver approach 36 with the further cover disk 32 and thus indirectly with the guide pin 28 and the cover disk 30 rotatably connected. The spring element 34 can a friction ring 38 against the flange ring 18 of the output flange 16 Press, leaving the cover disc 30 and the friction ring 38 directly and / or indirectly a frictional force on the output flange 16 can imprint, whereby a frictional damping can be achieved, which can dampen a resonance-induced build-up of torsional vibrations at least. The friction ring 38 can in this case rotationally fixed in a corresponding opening of the output flange 16 be used ( 1 ). As in 3 The cover disk can also be shown 30 indirectly via a friction ring 38 on the output flange 16 act.

The guide pin 28 can in particular by riveting with a driving ring 40 be firmly connected, with a secondary disc 42 , for example, in one piece, may be connected. The secondary disc 42 can in particular a friction surface 44 for a downstream friction clutch for coupling one with the flange assembly 10 form a coupled drive shaft of a motor vehicle engine with a transmission input shaft of a motor vehicle transmission. That about a primary mass 46 of the dual mass flywheel 14 introduced torque of the motor vehicle engine can via a designed in particular as a bow spring energy storage element in the flange 10 be initiated and over the guide bolts 28 to the secondary pulley 42 transmitted vibration damped.

At the in 1 to 3 illustrated embodiment of the flange 10 are the cover disks 30 . 32 over than in windows of the shields 30 . 32 and the output flange 16 inserted and tangible in the tangential direction compression coil spring designed damper springs 48 coupled, whereby a further torsional vibration damping in the manner of a disk damper can be realized. At the in 4 to 6 illustrated embodiment of the flange 10 are compared to the in 1 to 3 illustrated embodiment of the flange 10 the damper springs used in windows 48 omitted, resulting in a simpler and cheaper construction results, which provides sufficient vibration damping, especially at a higher number of cylinders of the motor vehicle engine.

LIST OF REFERENCE NUMBERS

10

flange

12

secondary mass

14

Dual Mass Flywheel

16

output flange

18

flange

20

flanged

22

pendulum mass

24

centrifugal pendulum

26

guide

28

guide pins

30

cover disc

32

another cover disc

34

spring element

36

drive dog

38

friction ring

40

driver ring

42

secondary disc

44

friction surface

46

primary mass

48

damper spring

b

width

e

extension

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

• DE 102008004150 A1 [0002]

Claims (11)

Flange assembly for a dual mass flywheel (14), with an output flange (16) for transmitting a torque, at least one circumferentially extending guide groove (26) formed in the output flange (16), at least one guide pin (28) guided in the guide groove (26) for transmitting the torque of the output flange (16) to a secondary pulley (42), a cover disc (30) secured to the guide pin (28) for covering a portion of an axial side of the output flange (16) and a spring element (34) biasing the cover disc (30) in the axial direction to provide a frictional force on the output flange (16) the cover plate (30). Flange arrangement according to Claim 1 characterized in that with the guide pin (28) a further cover disc (32) for providing a frictional force on the output flange (16) by means of the spring element (34) is fixed, wherein the output flange (16) in the axial direction between the cover disc (30 ) and the further cover plate (32) is arranged. Flange arrangement according to Claim 1 or 2 characterized in that the guide pin (28) as a stepped bolt with at least one axial bearing surface for the cover plate (30) and / or the further cover plate (32) is configured, in particular the guide pin (28) at its axial ends to form a rivet head plastic is deformed. Flange assembly according to one of Claims 1 to 3 characterized in that the guide pin (28) is indirectly or directly with the secondary pulley (42) rotatably secured, in particular, the secondary pulley (42) has an axial friction surface (44) for a friction clutch. Flange assembly according to one of Claims 1 to 4 characterized in that the frictional force applied by the cover disc (30) and / or the further cover disc (32) acts on a friction ring (38) connected in a rotationally fixed manner, in particular with the output flange (16). Flange assembly according to one of Claims 1 to 5 characterized in that the spring element (34) is designed as a plate spring, wherein the spring element (34) via a projecting with a proportion in the axial direction driver lug (36) with the cover plate (30) is directly or indirectly coupled in motion. Flange assembly according to one of Claims 1 to 6 characterized in that the cover plate (30) via a damper spring (48) is rotatably coupled to the output flange, wherein in particular the damper spring (48) is tangentially supported in a damper window of the cover plate (30) and in a flange of the output flange (16) , Flange assembly according to one of Claims 1 to 6 characterized in that with the output flange (16) at least one relative to the output flange (16), in particular pendulum tracks, pendulum pendulum mass (22) for generating a rotational irregularity in the rotational speed of the Ausgangsflanschs (16) oppositely directed restoring torque to form a centrifugal pendulum ( 24) is coupled, wherein the cover plate (30) and / or the further cover plate (32) in one of the pendulum mass (22) covered axial region is arranged radially inside the pendulum mass (22). Flange assembly according to one of Claims 1 to 7 characterized in that the output flange (16) has a circumferentially continuous flange ring (18) with a radial width b, wherein the cover disc (30) and / or the further cover disc (32) covers a radial extent e of the flange ring (18) and 0.05 ≦ e / b ≦ 0.75, in particular 0.10 ≦ e / b ≦ 0.50, preferably 0.15 ≦ e / b ≦ 0.35 and particularly preferably 0.20 ≦ e / b ≦ 0, 25 applies, wherein in particular the cover plate (30) and / or the further cover plate (32) covers the output flange (16) to the radially inner edge of the flange ring (18). Flange assembly according to one of Claims 1 to 8th characterized in that the extension of the guide groove (26) in the circumferential direction for the at least one in the guide groove (26) inserted guide pin (28) has a maximum relative angle of rotation α of 5 ° ≤ α ≤ 40 °, in particular 10 ° ≤ α ≤ 30 ° and preferably forms α ≤ 20 ° ± 3 °. A dual-mass flywheel for torsional vibration damping between a drive shaft of a motor vehicle engine and a transmission input shaft of a motor vehicle transmission, with a primary mass (46) for introducing a torque, a secondary mass (12) rotatably limited relative to the primary mass (46) for discharging the torque and one at the primary mass (46) and on the secondary mass (12) vulnerable energy storage element, in particular bow spring, for transmitting the torque, wherein the secondary mass (12) a flange assembly (10) according to one of Claims 1 to 9 having.

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