DE102017115218A1 - Schaltzugmitteleinheit with a rotation axis for an internal combustion engine - Google Patents

Abstract

The invention relates to a shift cable central unit (1) having an axis of rotation (2) for an internal combustion engine (3), comprising at least the following components: a traction pulley (4) for transmitting torque to or from a traction mechanism (5); 6) for rotationally fixed fastening to an output shaft (7), - a vibration decoupler (8) for decoupling vibrations of the shaft connection (6) from the pulley (4), - a switchable freewheel (9) for actively switching a torque transmission between the shaft connection ( 6) and the pulley (4). The Schaltzugmitteleinheit (1) is mainly characterized in that the shaft connection (6) via the switchable freewheel (9) with the vibration decoupler (8) switchable torque transmitting connected.Mittels the Schaltzugmitteleinheit proposed here, the always co-rotating with an output shaft mass is significantly reduced , Under certain circumstances can be dispensed with a torsional vibration damper.

Description

The invention relates to a Schaltzugmitteleinheit with a rotation axis for an internal combustion engine, a drive train with a hybrid drive, and a motor vehicle, which is drivable by means of such a drive train.

Zugmitteleinheiten, for example, as a belt drives, for torque-transmitting connecting a (driving) main unit, for example an internal combustion engine, with one or more (driven) ancillaries known from the prior art. A central element here is the traction pulley, for example, a pulley, which is driven by the output shaft of the main assembly and via a corresponding traction means, for example a V-belt that transmits the output torque as a tensile force on one or more shafts of one accessory or more ancillaries , For some time, it is customary in this context, to provide the said pulley for driving auxiliary units with a freewheel to the case of a sudden decrease in speed, for example, in a gear change in a motor vehicle, the ongoing because of the inertia of the ancillaries traction drive from the output shaft of Main unit to separate.

Recently, for example, in the field of commercial vehicles, a hybridization of a drive train is desired, wherein a starter generator is used, which replaces the classic alternator in one embodiment in motor vehicles. The starter generator is connected via a traction drive with the output shaft of the main unit, for example, the functions recuperation, starting and e-boosting should be met. As a result of the hybridization is now also a reverse torque curve, in which therefore the ancillaries to drive the output shaft. This is for example when Zugmittelanlassen (the sprocket annealing replacing) or E-Boosten the case, in the first case, the output shaft is accelerated by means of the traction device from the state and in the second case, the torque output of the output shaft of the main assembly is increased by a torque addition of the starter generator. The classic freewheel would prevent transmission to the connected powertrain. It is therefore necessary to allow a torque transmission in the previous direction of freewheeling.

Furthermore, such hybrid drives should be operable to save fuel or reduce emissions with a start-stop system. Due to the start-stop operation, the main unit, which drives the ancillaries, is often turned off. For example, then the pump of the air conditioner is no longer operated. Especially in traffic jams, the cab would heat up quickly in strong sunshine. The starter generator can continue to be operated so that the pump is electrically driven in the off state of the main unit. For this purpose, however, it is necessary to be able to separate the torque transmission of traction pulley on the output shaft to the main unit. For this purpose and for the above-mentioned separation to prevent inertial influences on the output shaft, the conventional freewheeling direction is still required.

Prior art is in the DE 10 2015 204 687 A1 in terms of a switchable freewheel and in the DE 10 2013 209 640 A1 with regard to an alternative switchable freewheel in which DE 10 2015 207 794 A1 with respect to an actuator for switching such a freewheel, as well as in the DE 10 2013 207 846 A1 in terms of a pulley with torsional vibration damper disclosed.

Due to the increase in functions of such Schaltzugmitteleinheit the mass of such Schaltzugmitteleinheit compared to a classic Zugmitteleinheit with fixed freewheel significantly increases and thus the moment of inertia. However, a high mass and a high mass moment of inertia have negative effects on the output shaft of the main unit. The high mass has, for example, the effect that when starting an internal combustion engine, the output shaft passes through unfavorable frequency ranges whose amplitude amplified by mass and / or generates a further unfavorable frequency due to resonance excitation of the Schaltzugmitteleinheit, especially in connection with a dual mass flywheel (DMF) on the opposite End of the output shaft. The moment of inertia counteracts the torque output of the output shaft and increases the torsional load on the output shaft.

On this basis, the present invention has the object, at least partially overcome the known from the prior art disadvantages. The features of the invention will become apparent from the independent claims, to which advantageous embodiments are indicated in the dependent claims. The features of the claims may be combined in any technically meaningful manner, for which purpose the explanations of the following description as well as features of the figures may be consulted which comprise additional embodiments of the invention.

• - eine Zugmittelscheibe zum Übertragen eines Drehmoments auf oder von einem Zugmittel;
• - einen Wellenanschluss zum rotationsfesten Befestigen an einer Abtriebswelle;
• - einen Schwingungsentkoppler zum Entkoppeln von Schwingungen des Wellenanschlusses von der Zugmittelscheibe;
• - einen schaltbaren Freilauf zum aktiven Schalten einer Drehmomentübertragung zwischen dem Wellenanschluss und der Zugmittelscheibe. Die Schaltzugmitteleinheit ist vor allem dadurch gekennzeichnet, dass der Wellenanschluss über den schaltbaren Freilauf mit dem Schwingungsentkoppler schaltbar drehmomentübertragend verbunden ist.

The invention relates to a Schaltzugmitteleinheit with a rotation axis for a Internal combustion engine, comprising at least the following components:

• - A Zugmittelscheibe for transmitting a torque to or from a traction means;
• a shaft connection for rotationally fixed fastening to an output shaft;
• - A vibration decoupler for decoupling vibrations of the shaft connection of the pulley;
• - A switchable freewheel for actively switching a torque transmission between the shaft connection and the pulley. The Schaltzugmitteleinheit is mainly characterized in that the shaft connection is connected via the switchable freewheel with the vibration isolator switchable torque transmitting.

Here, a Schaltzugmitteleinheit is proposed, for example, a switchable pulley decoupler (RSES), in which the force acting on the output shaft mass moment of inertia is very low. In the separate switching state of the freewheel, so switched in the direction of rotation freewheel direction or complete separation (freewheel is unlatched in both directions), the vibration isolator is completely separated from the output shaft. When the freewheel is closed, ie with torque transmission direction or torque transmission in both directions (freewheel is latched in both directions), the greater mass fraction and / or mass fraction is at the greater radial distance from the rotation axis (larger lever) by means of the elastic energy accumulator of the vibration isolator decoupled.

The Schaltzugmitteleinheit is a rotating or rotatable component whose axis of rotation is aligned with the axis of rotation of the output shaft. Is spoken in this description of axial, radial or a direction of rotation, so reference is made to this common axis of rotation. Depending on the technical context, an axial direction may also be a parallel to the axis of rotation.

The pulley, for example, designed as a pulley, is adapted for cooperation with a traction means, for example a belt, preferably a V-belt. About the Zugmittelscheibe is thus frictionally (in the case of a V-belt as traction means) and / or form-fitting (in the case of a toothed belt or a chain as traction means) transmit a torque over the radius of the pulley (lever) as a pulling force on a traction device. This tensile force is converted in an accessory in the same way back to a shaft of the accessory in a torque.

The Schaltzugmitteleinheit has a shaft connection, so that the Schaltzugmitteleinheit is connectable as a separate component with an output shaft. The shaft connection is set up in such a way that it can be easily connected and a correct alignment can be set. A common connection is, for example, a central screw connection or a multiple, advantageously rotationally symmetrical, screwed connection. For some applications, it is advantageous to carry out the torque-transmitting connection between the shaft connection and the output shaft as a spline.

The Schaltzugmitteleinheit further comprises a vibration decoupler, which is arranged between the Zugmittelscheibe and the shaft connection such that a vibration transmission from the output shaft to the pulley and vice versa is excluded or greatly reduced. For this purpose, such a vibration isolator for many applications, one or more elastic energy storage. Such an elastic energy store is, for example, a bow spring, which elastically springs in due to the inertia of the pulley and the system driven by it at an output shaft side acceleration and retransmitted this elastically stored energy due to a relaxation of the pulley delayed. Thus, the pulley is decoupled by the Schwingungsentkopplers of the superimposed torque vibrations without dissipating excess energy as heat energy.

Furthermore, the Schaltzugmitteleinheit comprises a switchable freewheel, by means of which active, that is, as a result of a corresponding externally input switching signal, several, preferably two, switching states are adjustable. In a first switching state, a torque is transferable in both directions, that is, in a pawl freewheel, the pawls are latched for both directions and the respective freewheeling function ineffective. This first switching state is also referred to as closed. In a second switching state no torque is transferable, so the pawls of a pawl freewheel all unlatched. This second switching state is also referred to as separate. Furthermore, two other switching states are adjustable, which allow freewheel in one direction. These switching states are necessary above all for a traction sheave below rotational speed. In this case, a torque in a direction of rotation with opposite freewheeling direction (third switching state) or in the reverse direction of rotation with reverse freewheeling direction (fourth switching state) can be switched transferable. That is, in the fourth switching state, the torque transmission direction and the freewheeling direction are changed from the third switching state. The freewheel acts in these switching states in the freewheeling direction separating. Which switching states are adjustable depends on the design of the switching element, for example, an axially displaceable switching cage, and the switching actuator, both of which are interpretable according to desired operating conditions. Often, the (fully) closed and the (completely) separate switching state are sufficient.

In the Schaltzugmittelinheit proposed here, the vibration isolator is not fixed on the side of the shaft connection so connected to the output shaft, but on the contrary, starting from the shaft connection towards the traction means switchable downstream of the switchable freewheel. This means, on the one hand, that in the case of a separate (second) switching state or a non-transmitting direction of rotation (third or fourth switching state), ie the switched freewheeling direction, the entire vibration decoupler, which is thus arranged on the center of the driven pulley, is not co-rotated with the output shaft. But even with a closed (first) switching state, the co-rotating mass is considerably reduced. When torque is output from the output shaft to the pulley namely only the corresponding input side is rotated in this switching state. Only the input side thus forms effective inertial mass. The corresponding output side is decoupled by means of the elastic energy store and thus does not cause any mass moment of inertia relevant to a superimposed oscillation.

This results in the above-mentioned advantages of a low moment of inertia of the output shaft fixed, ie not decoupled, co-rotating components of Schaltzugmitteleinheit.

According to an advantageous embodiment of the Schaltzugmitteleinheit the vibration isolator comprises a flange and a lid, wherein the flange and the cover are connected to each other by means of an elastic energy storage torque transmitting, and
wherein the flange is switchably connected with the switchable freewheel to transmit torque, and the lid is connected to the pulley fixed torque transmitting.

In this advantageous embodiment, the vibration isolator is provided with a flange and a lid, wherein the flange extends from central to radially outward. The flange thus acts in a classic operation with a torque output from the output shaft torque input side against the elastic energy storage. The cover is arranged radially outside the elastic energy storage and acts in a classic operation with a torque output from the output shaft torque output side against the elastic energy storage.

The cover preferably forms at least part of the housing of the elastic energy store, which is usually provided with a lubricant. Thus, the cover protects the lubricant space formed from leakage or contamination of the lubricant.

In a preferred embodiment, the cover at the same time forms the component for storage and / or dynamic sealing against a relative to movable component. The flange, however, is preferably completely housed in the lubricant space and arranged between the elastic energy storage and the freewheel.

The lid is preferably formed in one piece or several pieces firmly connected to the pulley. In a multi-part design of the lid and the pulley, the pulley is at the same time preferably a component of the housing of the elastic energy storage. In an application with an internal combustion engine with a downstream gear, the cover is preferably arranged on the motor side and the housing component of the pulley arranged on the transmission side.

When torque is output from the output shaft to the pulley the central flange forms the input side. The lid is decoupled. Thus, the mass and the lever compared to the reverse version with the lid as input side are further reduced.

According to an advantageous embodiment of the Schaltzugmitteleinheit, the switchable freewheel on a hub and a flange, wherein the hub and the flange element by means of movable freewheeling elements are connected to each other to transmit torque, and
wherein the hub is integrally formed with the shaft connection, preferably as a formed sheet metal part.

In this advantageous embodiment, at least one movable freewheeling element, preferably in each case a plurality of freewheeling elements, is arranged between a hub and a flange element for each freewheeling direction. In a preferred embodiment, the flange member is formed integrally with the flange of the vibration isolator as described above. In a further preferred embodiment, the hub is permanently with the connected to movable freewheeling elements. The movable freewheeling elements engage counter to the respective freewheeling direction in a corresponding system of the flange, so that a torque from the hub to the freewheeling element in this direction is transferable.

The hub is arranged radially inwardly of the flange element. A connection between the flange and the hub is thus supported by the centrifugal forces acting on the freewheel elements. In this configuration, the freewheeling elements of the freewheel are thus formed as normally engaging, preferably for the torque transmission from the output shaft to the traction pulley, is formed.

Also, the at least one freewheeling element for the second torque transmission direction for the second switching state described above is preferably the corresponding at least one (second) freewheeling element on the hub movable mounted permanently. Preferably, the second freewheel element is supported by the centrifugal force for the (opposite) torque transmission direction as normal engaging, preferably for the torque transmission from the traction pulley to the output shaft.

The freewheeling elements, or at least one of the freewheeling elements are preferably designed as folding in the radial direction pawls, preferably for transmitting a torque radially outwardly folding, wherein the radially outwardly facing pawl rear side can be wedge-like pressed out of the flange in relative rotation in the freewheeling direction from the engagement position and keyed in the torque transmission direction with the flange member.

For a particularly cost-efficient design, the hub is a formed sheet metal part. For example, the hub is formed by embossing, pressing or deep drawing of a flat sheet material.

According to an advantageous embodiment of the shift cable means unit, the shift cable means unit further comprises a torsional vibration damper and the torsional vibration damper is connected to the hub to transmit torque.

For some applications, it is necessary to provide a torsional vibration damper (TSD) for damping vibrations of the output shaft due to the selected output shaft rotation quality. Such a torsional vibration damper is particularly advantageously connected with the hub to transmit torque.

For a particularly cost-efficient design, the hub is a formed sheet metal part and / or the connection to the torsional vibration damper by means of a toothing or by means of plastic deformation during assembly formed frictional engagement, for example, caulking formed.

According to an advantageous embodiment of the Schaltzugmitteleinheit the Schaltzugmitteleinheit is executed without attenuation.

In a preferred embodiment, the moment of inertia is so small that a conventional torsional vibration damper (TSD) can be dispensed with, provided that the output shaft has sufficient vibration quality. That is, the mass fixedly coupled to the output shaft has such a low mass that only the quality of the output shaft is essential for the need for a torsional vibration damper. In this embodiment, the Schaltzugmitteleinheit is performed without damping. This means that no torsional vibration damper, neither preassembled nor as a separate component, is arranged between the output shaft and the pulley.

According to an advantageous embodiment of the Schaltzugmitteleinheit the vibration isolator, preferably the cover according to an embodiment as described above, supported by a central bearing on the shaft connection, preferably on the hub according to an embodiment as described above.

In this advantageous embodiment, a direct mounting of the lid of the vibration isolator on the shaft connection is possible. For most applications, the Schaltzugmitteleinheit will be desirable as a preassembled unit. In an alternative embodiment, it is possible to store the lid directly on the drive shaft. The inner ring of the central bearing is preferably formed as the stationary bearing ring and on the output shaft or the shaft connection, or preferably the hub, pressed.

In an embodiment in which the hub for the torsional vibration damper and for the freewheel are formed separately, the central warehouse is preferably applied either to the hub of the torsional vibration damper or to the hub of the freewheel.

Particularly advantageously, the cover is mounted on the hub of the freewheel, wherein the hub is preferably formed integrally for direct reception of the torsional vibration damper. Here, the central warehouse is preferably pre-assembled as part of the Schaltzugmitteleinheit. As a result, a small space, a small number of Parts and possibly reaches a low mass. The latter is advantageous because the hub is a permanently co-rotating component of the output shaft.

According to an advantageous embodiment of the Schaltzugmitteleinheit the switchable freewheel is actuated by means of a magnetic switching element, wherein the switching element by means of a magnetic coil between a disengaged position and an engaged position is axially movable back and forth, and thereby the switchable freewheel is actuated.

In this advantageous embodiment, the freewheel is magnetically switchable, that is, by means of a magnetic coil with an electrical signal. The coil is set up such that the switching element, for example designed as a switching cage, depending on the energization of the coil, freewheeling elements of the freewheel in the first switching state or in the second switching state according to the above description. Preferably, an elastic antagonist is provided, for example a compression spring, which holds the switch cage in a first position. Preferably, the first position corresponds to the first switching state, so that the freewheel for torque transmission in both directions, ie from the output shaft to the pulley and vice versa, is closed. During starting, during e-boosting or during recuperation, the switching element is deflected in this embodiment counter to the elastic antagonist, so that no torque transmission is then possible according to the second switching state.

The magnetic coil is preferably arranged coaxially with the output shaft and on the outside, that is, as seen from the output shaft, behind the vibration decoupler or axially overlapping with the vibration decoupler. This has the advantage that the magnetic coil can be easily removed for maintenance purposes.

In a preferred embodiment, a freewheel is used in a configuration according to the known prior art, in which case the magnetic switching element, the magnetic coil and / or the elastic antagonist have a reverse actuation direction. For example, the coil for pressing oppressed, rather than previously set for pulling, a coil armature.

According to an advantageous embodiment of the Schaltzugmitteleinheit a Flanschzentrierung is also provided for the flange of the Schwingungsentkopplers, wherein the Flanschzentrierung rotationally fixed, preferably directly connected to the Zugmittelscheibe, more preferably the Flanschzentrierung a friction device for reducing the speed of change of the stop direction in the freewheel at Torque reversal includes.

For a further reduction of the mass always co-rotating with the output shaft, it is advantageous to provide a flange centering which is arranged on the decoupled side, preferably on the cover or the pulley.

If it is necessary to reduce the speed of change of the stop direction of the freewheeling elements of the freewheel due to the vibrations or vibrations present in the individual case, a friction device is preferably provided on the output shaft side, for example a rubber buffer or pre-damper or a demand-switchable friction device, which is preferably connected to the switching element. If the relative speed between the freewheeling element and the (free-play) free flange of the vibration isolator is high, for example when the pulley is stationary and the output shaft is rotating at high torque, it is expedient for some applications to reduce the adaptation of the relative velocity via friction by means of the friction device and thus to prevent a knocking of the freewheeling elements with resulting rattling.

According to a further aspect, the invention relates to a drive train with a hybrid drive, wherein the drive train comprises an internal combustion engine with an output shaft and a starter with a starter shaft, and wherein the output shaft by means of the Schaltzugmitteleinheit according to an embodiment as described above and an associated traction means with the starter shaft switchable is connectable.

According to a further aspect of the invention, a powertrain is proposed with a hybrid drive, which comprises a (main) drive unit with an output shaft and a starter generator, and a Schaltzugmitteleinheit according to an embodiment as described above, wherein the output shaft for torque transmission by means of the Schaltzugmitteleinheit with switchable Freewheeling direction with a starter shaft of the starter generator is connectable.

The drive train is configured to transmit a torque provided by the drive unit, for example an internal combustion engine, and output via its output shaft to at least one consumer. An exemplary consumer is at least a drive wheel of a motor vehicle, an air conditioner and the starter generator for providing electrical Energy. Conversely, a recording of an inertial energy introduced, for example, by a drive wheel during braking of the motor vehicle, that is to say recuperation, can also be implemented.

The Schaltzugmitteleinheit described here can be used as a central component in a powertrain with a mild hybrid or in a full hybrid. While in a micro-hybrid the starter generator is set up solely for recuperation and for comfort starting, in a mild hybrid an additional e-boost, a traction aid and a load point boost will be possible. In a full hybrid is also a fully electric driving possible.

The Schaltzugmitteleinheit proposed here has a small with the output shaft of the drive unit always co-rotating mass. Thus, the output shaft when starting the drive unit on a low moment of inertia and may be waived on a hitherto mandatory torsional vibration damper.

According to a further aspect, the invention relates to a motor vehicle, comprising at least one drive wheel, which is drivable by means of a drive train according to an embodiment as described above.

Most motor vehicles today have a front-wheel drive and therefore preferably arrange the drive unit, for example an internal combustion engine or an electric drive machine, in front of the driver's cab and transversely to the main drive direction. The space is particularly small in such an arrangement and it is therefore particularly advantageous to use components of small size.

This problem is exacerbated in passenger cars of the small car class according to European classification. The functional units used in a passenger car of the small car class are not significantly reduced compared to passenger cars larger car classes. Nevertheless, the available space for small cars is much smaller. But even in commercial vehicles due to the increase in desired components and an increasing size of the accumulator to keep the increased electrical energy demand space constraints. The drive train described above has a Schaltzugmitteleinheit with low moment of inertia on the output shaft, at the same time a particularly small size is achieved.

Passenger cars are assigned to a vehicle class according to, for example, size, price, weight and power, and this definition is subject to constant change according to the needs of the market. In the US market, cars of the class small cars and microcars are classified according to European classification of the class of Subcompact Car and in the British market they correspond to the class Supermini or the class City Car. Examples of the micro car class are a Volkswagen up! or a Renault Twingo. Examples of the small car class are an Alfa Romeo Mito, Volkswagen Polo, Ford Fiesta or Renault Clio.

• 1: eine konventionelle Schaltzugmitteleinheit im Schnitt;
• 2: eine Schaltzugmitteleinheit mit Torsionsschwingungsdämpfer im Schnitt;
• 3: eine Schaltzugmitteleinheit ohne Torsionsschwingungsdämpfer im Schnitt; und
• 4: ein Antriebsstrang mit Hybridantrieb in einem Kraftfahrzeug.

The above-described invention will be explained in detail in the background of the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is not limited by the purely schematic drawings in any way, it being noted that the drawings are not dimensionally accurate and are not suitable for the definition of size ratios. It is shown in

• 1 a conventional Schaltzugmitteleinheit in section;
• 2 : a Schaltzugmitteleinheit with torsional vibration damper in section;
• 3 : a Schaltzugmitteleinheit without torsional vibration damper in section; and
• 4 : A powertrain with hybrid drive in a motor vehicle.

1 shows a conventional Schaltzugmitteleinheit 33 schematically in section, wherein components which are not essential for the understanding of the invention are not shown. Here is the torque curve or the force transmission curve 41 from the output shaft 7 (Here, only the central screw is shown), for example, an internal combustion engine, on the components of the conventional Schaltzugmitteleinheit 33 and over the pulley 4 in the traction means 5 located.

The components shown here are the axis of rotation 2 rotatably arranged. The conventional shift cable means unit 33 includes a vibration isolator 8th , Which with switchable torque transmission direction and thus switchable freewheeling direction over the freewheel 9 with the pulley 4 connected is. Furthermore, a torsional vibration damper 16 provided, which radially between the vibration isolator 8th and the traction means 5 is arranged. The vibration decoupler 8th centrally comprises an elastic energy storage 12 , indicated here as a bow spring, which (based on the illustrated force transmission curve 41 ) on the input side with the conventional lid 43 and on the output side with the conventional flange 42 for elastic, so vibration decoupling, transmission between the conventional cover 43 and the conventional flange 42 connected is. The conventional lid 43 is with a driver plate 37 of the torsional vibration damper 16 firmly connected. The driver plate 37 is over a rubber track 36 with a torsional vibration mass 35 for damping torsional vibrations from the output shaft 7 set up.

The vibration decoupler 8th and the torsional vibration damper 16 are here together via a shaft connection 6 with the output shaft 7 firmly connected. The conventional flange 42 of the vibration decoupler 8th at the same time integrally forms the flange element 14 of the freewheel 9 and acts in a torque direction, here the torque output from the output shaft 7 , with the here designed as a latch with the flange 14 engaged freewheeling element 15 for transmitting the torque via the hub 13 on the pulley 4 together. The freewheeling element 15 is movably arranged, for example, pivotable about a horizontal axis in the representation in the region of the illustrated overlap between the hub 13 and the freewheeling element 15 , To operate the freewheel 9 here is the magnetic coil 20 shown, with the associated switching armature 38 not shown (see 2 ).

The pulley 4 is about a central warehouse 18 on the conventional lid 43 supported and the entire system consisting of a vibration decoupler 8th and the torsional vibration damper 16 are with the output shaft 7 always co-rotating formed. This system forms the co-rotating mass 34 , which is outlined in this illustration with a dashed box. Just because of this large mass is a torsional vibration damper 16 necessary.

In 2 is a shift cable means unit 1 shown in which the vibration isolator 8th by means of the freewheel 9 from a torque transmitting connection to the output shaft 7 (Here, too, only the central screw is shown) is separable in one direction of rotation, wherein the free and the transmitting direction of rotation are reversible. For better understanding, the execution is in 2 as similar as possible to 1 designed, wherein the same or similar components are provided with the same reference numerals and insofar as auxiliaries referred to the above description. Here is the vibration decoupler 8th by means of a flange 10 over a freewheel 9 with a shaft connection 6 switchable connected, for example, completely closable and completely separable. Here are the shaft connection 6 and the hub 13 of the freewheel 9 in one piece, preferably formed as a formed sheet metal part.

About the elastic energy storage 12 , which is again indicated here as a bow spring, that is on the flange 10 transmitted torque on the lid 11 transferred, which in turn with the pulley 4 is firmly connected. The lid 11 forms together with the pulley 4 an enclosure for the vibration isolator 8th , The lid 11 also forms the support on the central warehouse 18 which is here on the wave connection 6 or on the hub 13 is supported.

Central at the axis of rotation 2 is a magnetic coil 20 provided by means of which a switching armature 38 the switching element 19 , For example, a switching cage, axially in the region of the freewheeling element 15 , here also designed as a latch, can be inserted (here in the illustration to the right). Furthermore, a configuration is shown in which, for example by means of a toothing 17 a torsional vibration damper 16 is provided, in which a driver plate 37 by means of a rubber track 36 with a torsional vibration mass 35 for damping of the output shaft 7 outgoing torsional vibrations is established. The torsional vibration damper 16 acts along the adjacent torque curve (dashed arrow) in a known manner damping the torque transmission.

It can be seen that the co-rotating mass 34 is significantly reduced because of the complete vibration decoupler 8th with separate freewheel from the output shaft 7 does not have to be taken. With freewheel closed 9 for a torque transmission according to the illustrated transmission pattern 41 from the output shaft 7 on the traction means 5 (First switching state according to the above example), the conventional functionality is still fully preserved and the majority of the inertia of the vibration isolator from the output shaft 7 decoupled. In contrast to the conventional Schaltzugmitteleinheit 33 according to the 1 is the central warehouse 18 between the shaft connection 6 and the vibration isolator 8th arranged.

In 3 is a damping-free variant of a Schaltzugmitteleinheit 1 shown, in which due to the low with the output shaft 7 (Here too, only the central screw connection is shown) always co-rotating mass 34 at an output shaft 7 with high rotational quality on a torsional vibration damper 16 (see 2 ) can be omitted. The rest of the construction is with the representation in 2 identical and insofar reference is made to the above description. Here is also a flange centering 39 which also in the embodiment according to 2 necessary, with an optional friction device 40 shown. This flange centering 39 , which due to a better clarity in the representations in 1 and 2 has not been shown and which conventionally on an element of the shaft connection 6 is arranged, here is the lid 11 attached and shown purely schematically. The flange centering 39 centers the flange 10 opposite the axis of rotation 2 but allowed between the flange 10 and the lid 11 a relative movement in the direction of rotation. The friction device 40 reduces the speed of a relative movement in the direction of rotation when reversing the direction of torque transmission.

In 4 is a powertrain 21 with a hybrid drive 22 in a motor vehicle 25 exemplified. The hybrid drive 22 includes a drive unit 26 , here exemplified as a three-cylinder internal combustion engine 3 shown, and a starter generator 23 , The starter shaft 24 of the starter generator 23 is by means of the traction device 5 , For example by means of a V-belt, with the output shaft 7 on which the Schaltzugmitteleinheit 1 is arranged, the drive unit 26 connected with switchable reversible torque transmission direction and associated freewheeling direction. In an operating state (for example, driving with full load operation of the drive unit 26 ) are a left drive wheel 28 and a right drive wheel 29 of the motor vehicle 25 by means of the drive unit 26 directly drivable. If necessary, at the same time becomes another consumer 27 , which also by means of the traction means 5 is driven, for example, the pump of an air conditioner, and / or the starter generator in the generator mode, ie for generating electrical energy driven. In another operating state (for example, acceleration with additional from the starter generator 23 provided torque, so e-boosting, the drive unit 26 ) consumes the starter generator 23 electrical energy and gives off a torque. Even with a stationary drive unit, while the drive wheels 28 and 29 standing or free rolling (idling mode or sailing operation) is the consumer 27 by means of the starter generator 23 further drivable. The hybrid drive is with its motor axis 32 , which to the axis of rotation 2 the Schaltzugmitteleinheit 1 Coaxially aligned, transverse to the longitudinal axis 31 in front of the driver's cab 30 arranged.

By means of the shift cable means proposed here, the mass which always co-rotates with an output shaft is considerably reduced. Under certain circumstances can be dispensed with a torsional vibration damper.

LIST OF REFERENCE NUMBERS

1

Schaltzugmitteleinheit

2

axis of rotation

3

Internal combustion engine

4

pulley

5

traction means

6

shaft connection

7

output shaft

8th

vibration isolators

9

freewheel

10

flange

11

cover

12

energy storage

13

hub

14

flange

15

Freewheeling element

16

torsional vibration damper

17

gearing

18

central warehouse

19

switching element

20

Kitchen sink

21

powertrain

22

hybrid drive

23

starter generator

24

starter shaft

25

motor vehicle

26

power unit

27

consumer

28

left drive wheel

29

right drive wheel

30

cab

31

longitudinal axis

32

motor axis

33

conventional shifter means unit

34

co-rotating mass

35

Torsionsschwingermasse

36

rubber track

37

drive plate

38

switching armature

39

Centering Flange

40

friction device

41

Power train

42

conventional flange

43

conventional lid

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 102015204687 A1 [0005]
• DE 102013209640 A1 [0005]
• DE 102015207794 A1 [0005]
• DE 102013207846 A1 [0005]

Claims (10)

Shift cable means unit (1) having an axis of rotation (2) for an internal combustion engine (3), comprising at least the following components: - a pulley (4) for transmitting a torque to or from a traction means (5); - A shaft connection (6) for rotationally fixed fastening to an output shaft (7); - A vibration decoupler (8) for decoupling vibrations of the shaft connection (6) of the pulley (4); - A switchable freewheel (9) for active switching a torque transmission between the shaft connection (6) and the pulley (4), characterized in that the shaft connection (6) via the switchable freewheel (9) with the vibration decoupler (8) switchable connected torque transmitting is. Schaltzugmitteleinheit (1) according to Claim 1 wherein the vibration decoupler (8) comprises a flange (10) and a cover (11), which are connected to each other transmitting torque by means of an elastic energy storage device (12), and wherein the flange (10) switchably connected to the switchable freewheel (9) to transmit torque is, and the cover (11) with the pulley (4) is firmly connected to transmit torque. Schaltzugmitteleinheit (1) according to Claim 1 or 2 wherein the switchable freewheel (9) has a hub (13) and a flange element (14) which can be connected to one another in a torque-transmitting manner by means of movable freewheeling elements (15), and wherein the hub (13) is formed in one piece with the shaft connection (6), preferably as a formed sheet metal part. Schaltzugmitteleinheit (1) according to Claim 3 wherein the shift cable means unit (1) further comprises a torsional vibration damper (16) and the torsional vibration damper (16) is connected to transmit torque to the hub (13). Schaltzugmitteleinheit (1) according to one of Claims 1 to 3 , wherein the Schaltzugmitteleinheit (1) is performed without attenuation. Schaltzugmitteleinheit (1) according to any one of the preceding claims, wherein the vibration decoupler (8), preferably the lid (11) according to Claim 2 , by means of a central bearing (18) on the shaft connection (6), preferably on the hub (13) Claim 3 or 4 , is supported. A shift cable means unit (1) according to any one of the preceding claims, wherein the shiftable one-way clutch (9) is operable by means of a magnetic shift member (19), the shift member (19) being axially displaced by a magnetic spool (20) between a disengaged position and an engaged position and is movable, and thereby the switchable freewheel (9) is actuated. Schaltzugmitteleinheit (1) according to one of Claims 2 to 7 , wherein furthermore a flange centering (39) for the flange (10) of the vibration decoupler (8) is provided, wherein the flange centering (39) is rotationally fixed, preferably directly, connected to the pulley (4), wherein particularly preferably the flange centering (39) a friction device (40) for reducing the speed of change of the stop direction in the freewheel (9) at torque reversal comprises. Drive train (21) with a hybrid drive (22), wherein the drive train (21) comprises an internal combustion engine (3) with an output shaft (7) and a starter generator (23) with a starter shaft (24), and wherein the output shaft (7) by means of the Schaltzugmitteleinheit (1) according to one of the preceding claims and an associated traction means (5) with the starter shaft (24) is switchably connectable. Motor vehicle (25), comprising at least one drive wheel (28,29), which by means of a drive train (21) to Claim 9 is drivable.

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