DE102009042831A1

DE102009042831A1 - Drive train for motor vehicle, has clutch unit arranged between internal-combustion engine and gear box, and centrifugal force pendulum integrated in clutch unit and formed by multiple centrifugal force pendulum elements

Info

Publication number: DE102009042831A1
Application number: DE200910042831
Authority: DE
Inventors: Christoph Raber; Florian Vogel
Original assignee: LuK GmbH and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2008-10-27
Filing date: 2009-09-24
Publication date: 2010-04-29

Abstract

The invention relates to a drive train with an internal combustion engine, a transmission and an interposed clutch unit. In order to reduce vibrations occurring in the drive train more effectively, it is proposed to integrate a centrifugal pendulum in the clutch unit as an alternative or in addition to already provided in the drive train vibration damping systems.

Description

The The invention relates to a drive train with an internal combustion engine, a transmission and a coupling unit arranged between them.
In such drive trains are internal combustion engines running in combustion chambers such as cylinders combustion processes effective, the non-continuous by their design-related operation Transmit torque to the drive train driving crankshaft. As a result, torsional or torsional vibrations occur, to whose damping so-called torsional vibration damper or torsional vibration damper are used. Become torsional vibration damper used for example in clutch plates of the clutch unit. Alternatively or in addition Are so-called dual-mass flywheels in use, in which the arranged on the crankshaft flywheel in a primary part with an associated primary mass and a secondary part with an associated secondary part limited configured contrary to the effect of energy storage rotatable becomes.
A Form of torsional vibration absorber has displaceable against the action of energy storage Absorber masses on. A special case of torsional vibration absorbers is the centrifugal pendulum, in the absorber masses on tracks with circumferential and radial portion are arranged displaceable, so that the absorber masses take different radii for torsional vibrations and thus the moment of inertia of the absorber mass receiving component increases and thus the component for a short time is slowed down.
The devices used in a powertrain to reduce of torsional vibrations are each adapted to the drive train. It has been found that the known arrangements of torsional vibration dampers in a dual mass flywheel and / or a disc damper one Clutch disc may not be sufficient to vibrations occurring in the drive train, by resonance of the torsional vibrations and / or be amplified by natural vibrations of the drive train can, sufficiently reduce.
It Therefore, the task arises in particular against the background of a in the drive train confined space additional or alternative possibilities to propose the reduction of driveline vibrations.
The Task is by a powertrain for a motor vehicle with a Internal combustion engine and a transmission and a between internal combustion engine and gear arranged clutch unit solved, wherein in the clutch unit a centrifugal pendulum is integrated. By the arrangement of a centrifugal pendulum in the clutch unit, an additional possibility to the already known possibility for the reduction of, for example, by an internal combustion engine proposed in a drive train induced torsional vibrations become. In this way, one can over all vibration damping devices uniform damping concept be proposed or it can by means of the centrifugal pendulum a specific damping problem solved or diminished, wherein an arrangement in the clutch unit in particular due to its positioning in the drive train and / or a space available there for the centrifugal pendulum advantageous can be. That way you can possibly already for other damping devices intended installation spaces for example, in a clutch disc and / or in a dual mass flywheel in particular maintained with several steamer stages, where appropriate on the cooperation with the centrifugal pendulum modified torsional vibration damper and / or Torsional vibration damper can be accommodated.
there The clutch unit can advantageously at least a friction clutch with a driven by the internal combustion engine Counter-pressure plate and a rotationally fixed and by means of actuating means across from this for producing a friction engagement with a clutch disc be formed axially displaceable pressure plate. As actuating means For example, a pressure plate against a housing of the Clutch assembly bracing plate spring or a corresponding Be lever system, the one by means of a clutch pedal from Driver or by means of an actuator automated actuation system be charged.
It has proved to be advantageous when the centrifugal pendulum radial outside a friction surface of Pressure plate is arranged. For advantageous space utilization The centrifugal pendulum can by several, distributed over the circumference centrifugal pendulum elements with a carrier part and at least one flyweight be formed. The can individual centrifugal pendulum elements in the circumferential direction between the radial extension of the pressure plate for mounting on the counterpressure plate or on the case be introduced. In this way, the centrifugal pendulum in the Essentially space-neutral housed in the clutch unit become.
The centrifugal pendulum elements can be installed as preassembled units in the clutch unit or during assembly of the Clutch unit can be integrated. In an advantageous embodiment, centrifugal pendulum elements are provided for this purpose, which are formed from two mutually axially spaced support members with guideways and the at least one flyweight with engaging in the guideways guide pins. Between the guide or raceways and the guide pins, a sliding or rolling bearing can be provided, in the case of a roller bearing, the pins roll in the raceways by the guide pins in the centrifugal weights are rotatably received, for example by means of rolling bearings. The centrifugal weights can be formed from several individual parts such as disc parts.
at occurring in the resonance range of the centrifugal pendulum torsional vibrations These are in the guideways the carrier parts relocated. It can be provided that the guide pins are not at the peripheral end portions of the guideways strike by before reaching the end portions of the way the guide pins in the guideways preferably limited by means provided in each case in both directions stops becomes. The attacks can be formed for example by flat rivets, the two support file fix each other. It has also proved to be advantageous if at the contact surfaces provided between the centrifugal weights and the attacks a stop buffer is. This can for example by a flyweight and / or be provided on the stop provided rubber buffer or a spring element.
In an advantageous embodiment can the centrifugal pendulum elements axially between a housing of the Clutch assembly and the counter-pressure plate may be arranged. there can this while a pre-assembly of the clutch unit attached to the housing and at a compound of counter pressure plate and housing the counterpressure plate to be centered. For this purpose, the carrier parts axially spaced fastening sleeves be provided by the centrifugal pendulum elements by means of Centering centered on the counter pressure plate. The centering means can Bolts or bolts that are the centrifugal pendulum in the assembly of the housing with pressure plate and diaphragm spring with the counter-pressure plate opposite this center and fix.
One Advantageous powertrain, a clutch unit with a provide single friction clutch, wherein the counter-pressure plate provided on a flywheel connected to the crankshaft is. As vibration damping devices can this one integrated in the clutch disc torsional vibration damper and serve the integrated in the friction clutch centrifugal pendulum. In special cases can only serve the centrifugal pendulum of the friction clutch for vibration damping. The friction clutch can be preassembled with the flywheel Assembly unit to be mounted on the crankshaft, taking in the components the friction clutch aligned openings are provided, through which the friction clutch on the crankshaft can be screwed.
Farther the counterpressure plate can be a secondary part of a dual mass flywheel be assigned. This means that the platen part of the secondary part is or is rotatably connected to this. Here, the torsional vibration damper of Maintained dual-mass flywheel essentially and a secondary side Effective centrifugal pendulum by the integrated in the clutch unit Centrifugal pendulum be proposed. In an advantageous manner can thereby for example, two damper stages, namely an outdoor and an inner damper, preserved and a torsional vibration damper in the form of the centrifugal pendulum secondary side to be ordered.
The Clutch unit can be dual clutch with two friction clutches be formed, wherein at least one centrifugal pendulum on axial Higher one Pressure plate of a friction clutch is arranged. In arrangement a common counter pressure plate for both friction clutches can each a friction clutch a centrifugal pendulum or corresponding centrifugal pendulum elements be associated with a centrifugal pendulum. It is understood that the centrifugal pendulum or the pendulum pendulum in a double clutch secondary side can be arranged when the dual clutch on the secondary side of a dual-mass flywheel and the crankshaft of the internal combustion engine are arranged on the primary side.
Farther the task is solved by a friction clutch, which is a centrifugal pendulum according to the previously stated embodiments contains. In particular for use as a spare part or for completion a drive train described above, a friction clutch the type described in an advantageous manner considered alone or in unit be provided with a dual mass flywheel according to the invention.
The invention is based on the in the 1 to 3 shown embodiments explained in more detail. Showing:
1 a schematically illustrated drive train,
2 a view of a friction clutch with centrifugal pendulum and
3 a centrifugal pendulum element in exploded view.
1 shows a schematically simplified drive train illustrated 1 with an internal combustion engine 2 with a crankshaft 3 at the one clutch unit 4 is received rotatably. Between crankshaft 3 and clutch unit 4 For example, a dual-mass flywheel may be effectively arranged. The clutch unit 4 may vary depending on the version of the gearbox 5 be designed as a simple friction clutch or as a double clutch with two friction clutches. Accordingly, the transmission of the engine takes place 2 delivered torque on the clutch unit 4 on two or - as shown - on a transmission input shaft 6 , In the transmission 5 there is a speed conversion and a - not shown - output of the torque via a differential to the drive wheels. The clutch unit 4 indicates the reduction or elimination of torsional vibrations of the drive train 1 a centrifugal pendulum 7 on, by itself or in coordination with other arranged to reduce torsional vibrations in the drive train devices, such as a dual-mass flywheel and / or a clutch disc damper, on the vibration behavior of the internal combustion engine 2 is tuned.
2 shows an embodiment of the clutch unit 4 in the form of a friction clutch 8th with one out of the on the crankshaft 3 ( 1 ) attached flywheel 9 formed counter-pressure plate 10 and a rotationally fixed and axially displaceable relative to this pressure plate 11 , where between counterpressure plate 10 and pressure plate 11 Friction linings of a, not shown, with the transmission input shaft 6 ( 1 ) rotatably connected clutch disc to form a frictional engagement are arranged clamped. The counterpressure plate 10 is with a housing 12 rotatably connected, on which the plate spring 13 via an adjusting device 14 axially supported and the pressure plate 11 acted upon axially. The printing plate 11 is on the case 12 and thus on the counter-pressure plate 10 rotatably and displaced recorded. For this purpose, the pressure plate 11 radially extended eyelets 15 on, at which free ends of the leaf springs 16 attack at the other end with the case 12 connected, for example, riveted.
casing 12 and counter pressure plate 10 have at their outer periphery an axial distance in which between the eyelets 15 the printing plate 11 distributed over the circumference of the centrifugal pendulum 7 ( 1 ) forming centrifugal pendulum elements 17 are introduced. For space-neutral recording has for this purpose the housing 12 corresponding cutouts 18 on. The centrifugal pendulum elements 17 are each made of two axially by means of the spacer sleeves 19 axially spaced support parts 20 . 21 formed between which the flyweights 22 along the in the support parts 20 . 21 introduced guideways 23 are relocatable. These are in the flyweights 22 guide pins 24 provided, depending on their inclusion in the flyweights 22 on the guideways 23 roll or slide. To reduce the sliding friction, the contact surfaces between guideways 23 and guide pins 24 coated and / or greased. For rolling displacement of the guide pins 24 in the guideways 23 can the guide pins 24 rotatable, preferably by means of a rolling bearing in the centrifugal weights 22 be included.
The flyweights 22 may be formed of a plurality of flat, stacked components. For fixing the complete centrifugal pendulum elements 17 before mounting the counterpressure plate 10 is the carrier part 21 on the housing 12 and the carrier part 20 by means of flat rivets 25 on the support part 21 fixed. The flat rivets 25 serve as stops at the same time 26 for the flyweights 22 , At the stops and / or the flyweights 22 can bump stop 27 , For example, be provided from elastomers.
In an advantageous embodiment, the only partially visible sensor spring is supported 29 on the support part 21 from. In one embodiment of a force-adjusting device 14 senses the sensor spring 29 a release force increased as a result of wear and gives a readjustment of the ramp device when a predetermined release force is exceeded 14 with those in the case 12 embossed ramps 28 and not shown counter ramps of Nachstellrings free. In this case, the ramp ring through the energy storage 30 limited twisted and a wear-related distance between pressure plate 11 and the housing 12 balanced.
When installing counterpressure plate 10 and housing 12 become the centrifugal pendulum elements 17 on the counterpressure plate 10 centered. For this purpose are through the mounting sleeves 19 screw 31 guided, with the counterpressure plate 10 be screwed.
3 shows a centrifugal pendulum element 17 in exploded view and the corresponding cutouts of the counter-pressure plate 10 and the housing 12 , In a first assembly step, the multi-part flyweight 22 and the guide pins 24 captive connected with each other. The guide pins 24 have frets 32 to maintain a distance to the support parts 20 . 21 on. After that, the flyweight 22 as well as the fastening sleeves 19 between the carrier parts 20 . 21 brought and the support parts 20 . 21 by means of flat rivets 25 with the housing 12 riveted. Especially with a nachträg final assembly of housing 12 and counter pressure plate 10 are the centrifugal pendulum element 17 and the other - not shown - centrifugal pendulum elements 17 of the 2 captive on the housing with the other components of the friction clutch 8th ( 1 ). During final assembly, the centrifugal pendulum element 17 on the counterpressure plate 10 For example, a flywheel 9 ( 1 ) by means of the screws 31 centered. The screws 31 tense by means of the fastening sleeves 19 casing 12 and counter pressure plate 10 together, so that no further fasteners for final assembly are needed.
In an advantageous embodiment of a friction clutch, in which a captive arrangement of centrifugal pendulum elements 17 is not necessary, for example, because the friction clutch as a unit, for example, in connection with a dual mass flywheel mounted on the crankshaft 3 ( 1 ), a corresponding centrifugal pendulum element can be manufactured as a separate unit and as a unit between pressure plate 10 and housing 12 introduced and then centered and fixed.

1: powertrain
2: Internal combustion engine
3: crankshaft
4: A clutch unit
5: transmission
6: Transmission input shaft
7: centrifugal pendulum
8th: friction clutch
9: flywheel
10: Platen
11: printing plate
12: casing
13: Belleville spring
14: readjustment
15: eyelet
16: leaf spring
17: Centrifugal pendulum element
18: neckline
19: mounting sleeve
20: support part
21: support part
22: flyweight
23: guideway
24: guide pin
25: Flachniet
26: attack
27: buffer
28: ramp
29: sensor spring
30: energy storage
31: screw
32: Federation

Claims

Powertrain ( 1 ) for a motor vehicle with an internal combustion engine ( 2 ) and a transmission ( 5 ) as well as between an internal combustion engine ( 2 ) and gearboxes ( 5 ) arranged clutch unit ( 4 ), characterized in that in the clutch unit ( 4 ) a centrifugal pendulum ( 7 ) is integrated.
Powertrain ( 1 ) according to claim 1, characterized in that the coupling unit ( 4 ) of at least one friction clutch ( 8th ) with one of the internal combustion engine ( 2 ) driven counter-pressure plate ( 10 ) and a rotationally fixed thereto and by means of actuating means relative to this for producing a frictional engagement with a clutch disc axially displaceable pressure plate ( 11 ) is formed.
Powertrain ( 1 ) according to claim 2, characterized in that the centrifugal pendulum ( 7 ) radially outside a friction surface of the pressure plate ( 11 ) is arranged.
Powertrain ( 1 ) according to one of claims 1 to 3, characterized in that the centrifugal pendulum ( 7 ) by a plurality of distributed over the circumference centrifugal pendulum elements ( 17 ) with a carrier part ( 20 . 21 ) and at least one flyweight ( 22 ) is formed.
Powertrain ( 1 ) according to claim 4, characterized in that the centrifugal pendulum elements ( 17 ) form a preassemblable unit.
Powertrain ( 1 ) according to one of claims 4 or 5, characterized in that the centrifugal pendulum elements ( 17 ) of two mutually axially spaced support parts ( 20 . 21 ) with guideways ( 23 ) and the at least one flyweight ( 22 ) into the guideways ( 23 ) engaging guide pins ( 24 ) are formed.
Powertrain ( 1 ) according to one of claims 4 to 6, characterized in that a path of the flyweights ( 22 ) along the guideways ( 23 ) by stops ( 26 ) before reaching end regions of the guideways ( 23 ) is limited.
Powertrain ( 1 ) according to claim 7, characterized in that the stops ( 26 ) by both carrier parts ( 20 . 21 ) fixing flat rivets ( 25 ) are formed.
Powertrain ( 1 ) according to claim 7 or 8, characterized in that between the centrifugal weights ( 22 ) and the attacks ( 26 ) a stop buffer ( 27 ) is provided.
Powertrain ( 1 ) according to one of the claims 4 to 9, characterized in that the centrifugal pendulum elements ( 17 ) axially between a housing ( 12 ) of the clutch unit ( 4 ) and the counterpressure plate ( 10 ) are arranged.
Powertrain ( 1 ) according to claim 10, characterized in that the centrifugal pendulum elements ( 17 ) during a pre-assembly on the housing ( 12 ) are attached captive and at a compound of counter-pressure plate ( 10 ) and housing ( 12 ) on the counterpressure plate ( 10 ) are centered.
Powertrain ( 1 ) according to one of claims 4 to 11, characterized in that between the carrier parts ( 20 . 21 ), Counterpressure plate ( 10 ) and housing ( 12 ) axially spaced mounting sleeves ( 19 ) are provided, through which the centrifugal pendulum elements ( 17 ) by means of centering on the counter-pressure plate ( 10 ) are centered.
Powertrain ( 1 ) according to claim 12, characterized in that the centering means screws 31 for fixing the housing ( 12 ) on the counterpressure plate ( 10 ) are.
Powertrain ( 1 ) according to one of claims 1 to 12, characterized in that the counter-pressure plate ( 10 ) with a crankshaft ( 3 ) of the internal combustion engine ( 2 ) connected flywheel ( 9 ).
Powertrain ( 1 ) according to one of claims 1 to 12, characterized in that the counter-pressure plate is associated with a secondary part of a dual-mass flywheel.
Powertrain ( 1 ) according to one of claims 1 to 12, characterized in that the counter-pressure plate is associated with two, a double clutch forming friction clutches.
Friction clutch ( 8th ) for a drive train with an integrated centrifugal pendulum ( 7 ).