Belt drive for driving a motor vehicle, in particular a motorcycle, and motor vehicle, in particular a motorcycle

Abstract

Belt drive (1) for driving a motor vehicle (2), comprising a first pulley (13) drivable by a drive motor (8) of the motor vehicle (2), comprising a belt (15) which has a first strand (18) and a second strand (19) and at least partially wraps around the first pulley (13) and is thereby drivable by the first pulley (13), comprising a second pulley (16) which is at least partially wrapped by the belt (15) and is thereby drivable by the belt (15), whereby a vehicle wheel (4) of the motor vehicle (2) and thereby the motor vehicle (1) can be driven by means of the belt drive (1) via the second pulley (16), comprising a first damping element (20) provided in addition to the pulleys (13, 16) and directly contacting the first strand (18) of the belt (15) for damping vibrations of the strand (18), and comprising a first damping element (20) provided in addition to the first Damping element (20) and in addition to the pulleys (13,16) and directly touching the second strand (19), second damping element (21) for damping vibrations of the second strand (19), characterized in that: , - the belt drive (1) has at least or exactly one tensioning device (22) provided in addition to the damping elements (20, 21), by means of which the belt (15) is tensioned more strongly than by means of the damping elements (20, 21); - the first damping element (20) is held on a first lever arm (23) which is held on a first base element (28) of the belt drive (1) so as to be pivotable about a first lever arm pivot axis (27); and - the second damping element (21) is held on a second lever arm (24) which is held on the first base element (28) or on a second base element (30) of the belt drive (1) so as to be pivotable about a second lever arm pivot axis (29) spaced from the first lever arm pivot axis (27) and running parallel to the first lever arm pivot axis (27).

Description

[0001] The invention relates to a belt drive for driving a motor vehicle, in particular a motorcycle. Furthermore, the invention relates to a motor vehicle, in particular a motorcycle, with such a belt drive.

[0002] DE 196 31 507 A1 discloses a tensioning device for a belt drive having a cup-shaped pulley for driving auxiliary units. EP 1 437 528 B1 discloses a tensioning device for a belt drive for driving auxiliary units. Furthermore, EP 1 369 622 B1 discloses a tensioning device for traction means for driving auxiliary units. Furthermore, DE 10 2018 215 451 A1 discloses a motorcycle. DE 10 2010 010 834 A1 discloses a tensioning device for an auxiliary drive on a machine. Furthermore, US 2002 / 0043416 A1 discloses a motorcycle.

[0003] The object of the present invention is to provide a belt drive and a motor vehicle so that a particularly advantageous drive of the motor vehicle can be realized.

[0004] This object is achieved according to the invention by a belt drive having the features of patent claim 1 and by a motor vehicle having the features of patent claim 6. Advantageous embodiments of the invention are the subject of the dependent claims.

[0005] A first aspect of the invention relates to a belt drive for driving a motor vehicle. As will be explained in more detail below, the belt drive is a traction drive and is designed to drive the motor vehicle as a whole, i.e., to travel along a ground when the motor vehicle is supported downwards on the ground in the vertical direction of the vehicle. This means that the motor vehicle, in its fully manufactured state, has the belt drive and can be driven by means of the belt drive, i.e., can be traveled along a or the aforementioned ground while or when the motor vehicle is supported downwards on the ground in the vertical direction of the vehicle. The motor vehicle is preferably a motor cycle, in particular a motorcycle.For example, the motor vehicle, which is designed in particular as a motorcycle, very particularly as a motorbike, has at least or very preferably exactly two vehicle wheels, also simply referred to as wheels, so that the motor vehicle, in particular the motorcycle, is preferably a two-wheeler. In particular, the motor vehicle is a single-track motor vehicle. Very particularly, the motor vehicle is a land vehicle. Furthermore, it is conceivable for the motor vehicle to have at most or exactly three vehicle wheels, also simply referred to as wheels, so that the motor vehicle can be designed, for example, as a trike or a three-wheeler. The vehicle wheels of the motor vehicle are ground contact elements by means of which the motor vehicle can be or is supported downwards in the vertical direction of the vehicle on the aforementioned ground.If the motor vehicle is driven along the ground by means of the belt drive, while the motor vehicle is supported on the ground via its ground contact elements in the vertical direction of the vehicle, the ground contact elements (vehicle wheels) roll, in particular directly, on the ground. Furthermore, in its fully manufactured state, the motor vehicle has at least or exactly one drive motor by means of which the motor vehicle can be driven. The drive motor can be an internal combustion engine, in particular a reciprocating piston engine. However, the drive motor is very preferably an electric machine, which can be operated in particular in motor mode and thus as an electric motor. The motor vehicle can therefore be, for example, a hybrid or electric vehicle, in particular a battery electric vehicle (BEV).

[0006] The belt drive has a first pulley, which is also referred to as the first belt wheel. The pulley can be driven by the drive motor of the motor vehicle. For this purpose, for example, the first pulley is or can be coupled to the drive motor, in particular to an output shaft of the drive motor, in a torque-transmitting, in particular rotationally fixed, manner. In particular, the drive motor can provide torque for driving the motor vehicle and thus the first pulley via its output shaft. For example, the output shaft, particularly when the drive motor is designed as an electric machine, is a shaft of a rotor of the electric machine, also referred to as a rotor shaft, which has, for example, the rotor and a stator. The rotor can be driven by means of the stator and can therefore be rotated relative to the stator about an output axis of rotation, also referred to as the machine axis of rotation.In particular, it is conceivable that the first pulley is arranged coaxially to the output shaft.

[0007] The belt drive also has a belt. The belt is a traction device which, in itself, i.e. considered on its own, is flexible, i.e., has no shape. The traction device can therefore only transmit tensile forces, but not compressive forces. The belt drive wraps around the first pulley at least partially, whereby the belt can be driven by the first pulley, in particular by driving the first pulley. In other words, if the first pulley is driven, in particular by the drive motor, the belt is driven by or by the first pulley, so that the belt is driven or can be driven by the drive motor via the first pulley. The belt drive also has a second pulley, which is also referred to as the second belt wheel.The belt also wraps at least partially around the second pulley, whereby the second pulley can be driven by the belt. The second pulley can thus be driven by the first pulley via the belt, so that the second pulley can be driven by the drive motor, in particular by the output shaft, via the belt and the first pulley. In particular, the first pulley is rotatable about a first pulley axis of rotation, in particular relative to a base of the motor vehicle. Thus, for example, the first pulley can be driven by the drive motor and thereby rotated about the first pulley axis of rotation. Furthermore, it is conceivable for the second pulley to be rotatable about a second pulley axis of rotation, in particular relative to the base of the motor vehicle. In this case, it is provided in particular that the pulley axes of rotation run parallel to one another and are spaced apart from one another.In particular, the belt wraps around the respective pulley around the respective pulley rotation axis. By driving the respective pulley, the respective pulley is rotated about its respective pulley rotation axis, in particular relative to the base.

[0008] By driving the second pulley, at least one or exactly one of the vehicle wheels of the motor vehicle can be driven, thereby enabling the motor vehicle as a whole to be driven. The vehicle wheel that can be driven by driving the second pulley is also referred to as a drivable or driven wheel or as a drivable or driven vehicle wheel. When reference is made below to the vehicle wheel, this refers, unless otherwise stated, to the vehicle wheel that can be driven by or by the second pulley.

[0009] The vehicle wheel can thus be driven by the belt via the second pulley, so that the vehicle wheel can be driven by the drive motor, in particular by the output shaft, via the second pulley, the belt and the first pulley. In this way, the motor vehicle as a whole can be driven. In particular, it is conceivable for the vehicle wheel to be rotatable or to be rotated about a wheel rotation axis relative to the base of the motor vehicle, in particular when the vehicle wheel is driven by the second pulley and thus by the belt drive. In this case, it is provided in particular that the wheel rotation axis runs, for example, parallel to the first pulley rotation axis of the first pulley and is spaced from the first pulley rotation axis.In principle, it is conceivable for the wheel axis of rotation to run parallel to the second pulley axis of rotation of the second pulley and to be spaced from the second pulley axis of rotation. However, it is particularly conceivable for the vehicle wheel to be arranged coaxially to the second pulley, so that the wheel axis of rotation coincides with the second pulley axis of rotation and vice versa. For example, the vehicle wheel is or can be coupled to the second pulley in a torque-transmitting, in particular rotationally fixed, manner. Thus, for example, the respective torque provided by the drive motor, in particular via its output shaft, can be transmitted from the drive motor, in particular from the output shaft, to the first pulley.The belt drive can, for example, provide respective second torques via the second pulley, which are also referred to as output torques and result from the respective first torques provided by the drive motor, in particular via the output shaft. In particular, the respective second torque can be transmitted from the second pulley to the vehicle wheel, thereby driving the vehicle wheel.

[0010] The belt has a first run and a second run. The belt drive also has a first damping element, which is provided in addition to the pulleys and in addition to the belt drive and which directly contacts the first run of the belt, so that vibrations of the first run can be damped by means of the damping element. The belt drive has a second damping element, which is provided in addition to the first damping element and in addition to the pulleys and directly contacts the second run, for damping vibrations of the second run. As is well known, the respective run is a respective part or branch of the circulating, in particular endless, belt, wherein the respective run extends in particular between the pulleys.

[0011] On the one hand, a belt drive design that is lightweight, space-saving, and cost-effective can be realized, so that the vehicle wheel and thus the motor vehicle as a whole can be driven particularly advantageously and especially efficiently by means of the belt drive. On the other hand, because vibrations of the respective strand and thus of the belt can be effectively and efficiently dampened by means of the damping element, a particularly advantageous noise behavior of the belt drive or of the motor vehicle as a whole can be achieved, so that the motor vehicle can be driven particularly advantageously. The invention is based in particular on the following findings: In tests with a motor vehicle equipped with a belt drive, resonant peaks in certain speed ranges had a negative acoustic impact. The tests were able to attribute these peaks to the belt as the cause.With the belt drive according to the invention, such negative and thus undesirable acoustic abnormalities can now be avoided, since the belt strand or its vibrations can be effectively and efficiently damped by means of the damping element. This allows a particularly advantageous, in particular a nearly uniform, tonality of the belt drive to be achieved.

[0012] Preferably, the belt is a toothed belt, so that the belt drive is preferably a toothed belt drive or timing belt drive. This allows for a particularly efficient drive of the motor vehicle.

[0013] The belt drive has at least one tensioning device in addition to the damping elements, by means of which the belt is tensioned more strongly than by the damping elements. This makes it possible to achieve a separation of functions. With the separation of functions, the tensioning device is used to advantageously tension the belt. Vibrations in the belt are damped not at all by the tensioning device or are damped to a much lesser extent than by the respective damping element. The respective damping element, on the other hand, is used to dampen the respective strand or vibrations of the respective strand in order to avoid excessive vibrations in the respective strand, whereby the respective damping element does not tension the belt or tensions it to a much lesser extent than the tensioning device.

[0014] In particular, it can be provided that the respective damping element does not tension the belt at all or does not tension it significantly. For this purpose, for example, the respective damping element does touch the respective strand and thus the belt, but the respective damping element exerts at least almost no or only a very small force on the belt that could cause tensioning of the belt, so that when the belt is driven, the respective damping element only strokes the belt very lightly and gently. Actual tension or pre-tension of the belt, however, is brought about by means of the tensioning device, particularly in comparison to the respective damping element. This can prevent the respective damping element or tensioning device from having a dual function that provides for both damping of belt vibrations and tensioning of the belt.The findings underlying the invention in this regard are, in particular, that a belt, such as a toothed belt, is usually pre-tensioned and thus tensioned either by increasing the distance between the pulley axes of rotation, also known as the center distance, or by means of a tension pulley, whereby additional damping is not provided. Thus, the tensioned belt, in particular its tensioned belt strands, can vibrate freely, similar to a guitar string. Frequently used, fixed-position or spring-loaded tension pulleys usually operate with a relatively high contact force required to tension the belt and thereby ensure the formation of a vibration node on the tension pulley and thus a shift in the resonant frequencies of the belt.However, due to their function, these tension pulleys are subject to further requirements, for example with regard to dimensioning, positioning, wrap angle, and can therefore rarely be used for advantageous damping of the belt and thus for acoustic optimization, since such a tension pulley usually has the previously described dual function, and thus such a tension pulley is used without additional damping.

[0015] If a belt strand (also known as the belt run) is excited in its own mode, for example, by the teeth of a pulley, the polygon effect, etc., the vibration and thus the sound radiation are amplified. This is clearly noticeable to people, such as the driver, in the form of increased noise at certain speeds and is often perceived as unpleasant.

[0016] The invention now aims in particular at damping the respective tensioned strand by means of the respective damping element, wherein the respective strand is under tension in particular because the belt, and thus the respective strand, is tensioned by means of the tensioning device provided in addition to the damping elements. The respective strand is, for example, either damped in such a way that the vibration amplitude is kept as low as possible across all speed ranges, or the resonance frequencies are shifted to driving conditions in which they are not perceived as disturbing. Advantageously, not just one but as many eigenmodes as possible are damped or shifted simultaneously by the same damping element.

[0017] The respective damping element is positioned, if possible, in the antinode of the vibration mode or modes to be damped that would occur if the respective damping element were not provided, and under no circumstances in a vibration node. A force, for example, in the form of a contact force, that the damping element exerts on the respective strand to dampen the vibrations, is preferably so small that no new vibration modes with nodes form on the damping element.

[0018] The first damping element is held on a first lever arm, which is pivotably mounted on a first base element of the belt drive about a first lever arm pivot axis. The second damping element is held on a second lever arm, which is pivotably mounted on the first base element or on a second base element of the belt drive about a second lever arm pivot axis spaced from the first lever arm pivot axis and running parallel to the first lever arm pivot axis.

[0019] The base element can, for example, be the aforementioned base or a component of the aforementioned base. It is very preferably provided that the respective lever arm pivot axis runs parallel to the pulley rotation axes and is spaced apart from the pulley rotation axes. Thus, it is particularly conceivable for the pulley to be rotatable about its respective pulley rotation axis relative to the base element. By means of the respective lever arm and the respective damping element held thereon, a particularly advantageous damping of the respective strand or the vibrations can be achieved.

[0020] In order to achieve particularly effective damping of the vibrations or of the respective strand, a further embodiment of the invention provides that the respective lever arm is supported on the base element via at least one respective spring element and can be pivoted relative to the base element against a spring force provided or provideable by the spring element. The spring element is preferably a mechanical spring element, and therefore a solid body. For example, the spring element can be a torsion spring. For example, because the respective damping element directly touches the respective strand, vibrations of the respective strand cause the respective damping element and the respective lever arm to be pivoted relative to the base element. As a result, the respective spring element is elastically deformed, whereby the vibrations of the respective strand are effectively and efficiently damped.

[0021] In order to be able to dampen vibrations of the respective strand particularly advantageously and to realize a particularly efficient drive, it is provided in a further embodiment of the invention that the respective damping element is a respective roller. In particular, the respective roller is rotatable about a respective roller axis of rotation relative to the base because the respective roller axis of rotation runs, for example, parallel to the pulley axes of rotation and is spaced from the roller axes of rotation. In particular, the respective roller axis of rotation is spaced from the respective pivot axis, wherein the respective roller axis of rotation can run parallel to the respective pivot axis. If the belt is driven, in particular by means of the first pulley, the respective roller is rotated about its respective roller axis of rotation relative to the base element because the respective roller, also referred to as the damping roller, directly touches the respective strand and thus the belt.

[0022] It has proven particularly advantageous if the respective roller is mounted rotatably on the respective lever arm. This allows vibrations of the respective strand to be dampened in a particularly low-friction and efficient manner.

[0023] Finally, it has proven particularly advantageous if the respective damping element is a respective slide rail on which the belt slides when the belt is driven and thereby moved relative to the slide rail.

[0024] For example, the respective roller can dampen the respective strand or its vibrations in such a way that the respective roller is movably mounted, in particular rotatably held, in particular mounted, on the respective lever arm and presses against or onto the respective strand with an advantageously low force. The said force results, for example, in particular exclusively, from the weight of the respective damping element and / or the force results from the spring force or is caused by the respective spring element. A damping effect of the respective damping element can, for example, be caused by friction in a mechanism of the respective roller. A degree of freedom of movement of the respective roller can, for example, be rotational and / or linear or translational.As an alternative to the movably, in particular rotatably, mounted roller, which is movable in particular by being pivotable with the lever arm about the pivot axis relative to the base element, a positionally fixed but elastic, i.e., elastically deformable roller can be used, which is formed, for example, from an elastomer. Thus, it is conceivable that the roller, for example, is rotatable about its roller rotation axis relative to the base, but otherwise is held immovably relative to the base, i.e., is not moved relative to the base by vibrations of the strand, but is elastically deformed by vibrations of the strand, whereby the vibrations of the strand can be advantageously dampened.

[0025] For example, if the goal is to shift the resonance frequency into less disruptive ranges, the following may apply: The contact force with which the damping element presses against the strand must be selected to be higher, so that the damping element is always in contact with or against the strand and thus the belt, and a new vibration node is formed, particularly compared to the belt drive in which the damping element is not provided. This divides the strand into two shorter sub-strands, with a first of the sub-strands running between the first pulley and the damping element, and a second of the sub-strands running between the damping element and the second pulley. Each of the sub-strands has higher resonance frequencies than the strand as a whole.A positioning system of the damping element is crucial for a desired shift of the resonances, since the natural frequencies of a strand are anti-proportional to its freely vibrating length.

[0026] Particularly preferably, the invention provides that a tension, in particular pretension, of the belt or on the belt that is advantageous for operation of the belt drive is brought about by another device provided in addition to the damping element in the form of the aforementioned tensioning device. The tensioning device can have at least or exactly one tensioning pulley provided in addition to the damping element, by means of which the belt is tensioned more strongly than by means of the damping element. Alternatively or additionally, the tensioning device can be or comprise an axle distance changing device, by means of which a distance between the pulley axes of rotation, also referred to as the axle distance and running perpendicular to the pulley axes of rotation, can be changed or adjusted in order to tension the belt. In particular, the axle distance can be increased by means of the axle distance changing device in order to tension the belt.Since the tensioning device provided in addition to the damping element is preferably used to tension the belt, the damping element, also referred to as a damper, can advantageously be dimensioned small, and the damping element does not have to be subject to restrictions applicable to tension pulleys, such as wrap angle and positioning. This allows the damping element to be optimized for a desired acoustic effect, so that unwanted vibrations of the belt strand and thus unwanted noise can be advantageously avoided by means of the damping element.

[0027] A second aspect of the invention relates to a motor vehicle, preferably designed as a motorcycle, and very preferably as a two-wheeler or three-wheeler. The motor vehicle has a drive engine and at least one vehicle wheel. In particular, the motor vehicle has at least or exactly two vehicle wheels. In particular, the motor vehicle can have at most or exactly three vehicle wheels. The motor vehicle also comprises a belt drive designed to drive the motor vehicle, which belt drive has a first belt pulley drivable by the drive engine of the motor vehicle. The belt drive also has a belt which at least partially wraps around the first belt pulley and can therefore be driven by the first belt pulley.Furthermore, the belt drive comprises a second pulley, which is at least partially wrapped by the belt and can therefore be driven by the belt, whereby the at least one vehicle wheel, in particular at least or exactly one of the vehicle wheels of the motor vehicle, can be driven via the second pulley, whereby the motor vehicle as a whole can be driven. The belt has a first run and a second run. Furthermore, the belt drive comprises a first damping element, which is provided in addition to the pulleys and directly contacts the first run of the belt, for damping vibrations of the first run. The belt drive has a second damping element, which is provided in addition to the first damping element and in addition to the pulleys and directly contacts the second run, for damping vibrations of the second run.The belt drive has at least one or exactly one tensioning device provided in addition to the damping elements, by means of which the belt is tensioned more strongly than by means of the damping elements. The first damping element is held on a first lever arm, which is held on a first base element of the belt drive so as to be pivotable about a first lever arm pivot axis. The second damping element is held on a second lever arm, which is held on the first base element or on a second base element of the belt drive so as to be pivotable about a second lever arm pivot axis spaced from the first lever arm pivot axis and running parallel to the first lever arm pivot axis. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention and vice versa.

[0028] Finally, it has proven particularly advantageous if the motor vehicle is designed as a motorcycle which has at most or exactly three vehicle wheels, in particular exactly two vehicle wheels, wherein at least or exactly one of the vehicle wheels of the motor vehicle can be driven by the belt via the second pulley and thus by means of the belt drive, whereby the motor vehicle can be driven.

[0029] Further details of the invention will become apparent from the following description of a preferred embodiment with the accompanying drawings. Fig. 1 is a schematic side view of a belt drive for a motor vehicle designed as a motorcycle; Fig. 2 a partial schematic perspective view of the belt drive; and Fig. 3 a schematic side view of the motor vehicle, which is designed as a motorcycle.

[0030] In the figures, identical or functionally identical elements are provided with the same reference symbols.

[0031] Fig. 1 shows a schematic side view of a belt drive 1 for driving a Fig. 3 shows a schematic side view of a motor vehicle designed as a motorcycle 2. In the exemplary embodiment shown in the figures, the motorcycle 2 is designed as a motorcycle, so that the motor vehicle is a single-track land vehicle. The motorcycle 2 has exactly two vehicle wheels, namely a first vehicle wheel 3 as the front wheel and a second vehicle wheel 4 as the rear wheel. Fig. 3 shows that the vehicle wheels 3 and 4 are ground contact elements by means of which the motor vehicle (motorcycle 2) can be or is supported downwards in the vertical direction of the vehicle on a ground 5 that is, in particular, at least substantially horizontal. The vehicle wheels 3 and 4 directly touch the ground 5. The vertical direction of the vehicle is illustrated by a double arrow 6. The vehicle wheels 3 and 4 are arranged one behind the other in the longitudinal direction of the motorcycle 2, with the longitudinal direction being illustrated by a double arrow 7.

[0032] The motorcycle 2 further comprises, in particular precisely, a drive motor 8, which can be designed as an internal combustion engine or as an electric machine. The drive motor 8 has an output shaft via which the drive motor 8 can provide torques, which are also referred to as drive torques, wherein the motor vehicle (motorcycle 2) can be driven by means of the respective drive torque. For example, the motorcycle 2 has a chassis 9, which can be designed, for example, as a frame, in particular as a ladder frame. The drive motor 8 can be part of the chassis 9 or can be held on the chassis 9. The motorcycle 2 also has a base element, also referred to as a base, which in the exemplary embodiment shown in the figures is designed as a so-called swing arm 10.The vehicle wheel 4, designed as a rear wheel, is rotatably mounted on the swing arm 10, so that the swing arm 10 in the present case is a rear-wheel swing arm. In particular, the rear vehicle wheel 4 is rotatably mounted on the swing arm 10 about a wheel rotation axis 11 relative to the swing arm 10. The swing arm 10 and, with the swing arm 10, the vehicle wheel 4 can be pivoted about a swing arm pivot axis relative to the chassis 9, wherein the swing arm pivot axis runs, for example, in the transverse direction of the vehicle, i.e., parallel to the transverse direction of the vehicle. The transverse direction of the vehicle is illustrated by a double arrow 12. The wheel rotation axis 11 runs, for example, in the transverse direction of the vehicle, i.e., parallel to the transverse direction of the vehicle. The swing arm pivot axis and the wheel rotation axis 11 are spaced from one another, for example, in the longitudinal direction of the vehicle and run parallel to one another.

[0033] The belt drive 1 has a first pulley 13, which is driven by the drive motor 8 and thus rotatable about a first pulley rotation axis 14 relative to the base element. In particular, the first pulley rotation axis 14 runs in the vehicle transverse direction, i.e., parallel to the vehicle transverse direction. For example, the first pulley 13 is connected or connectable, i.e., coupled or couplable, to the output shaft in a torque-transmitting, in particular rotationally fixed manner.

[0034] For example, the pulley 13 is arranged coaxially with the output shaft. In particular, it is conceivable that the pulley 13 is mounted on the chassis 9 so as to be rotatable about the pulley rotation axis 14 relative to the chassis 9, so that the rocker arm 10 can be pivoted about the rocker pivot axis relative to the pulley 13. In this case, it is particularly provided that the rocker pivot axis and the pulley rotation axis 14 are spaced apart from one another and, for example, run parallel to one another.

[0035] The belt drive 1 also has a traction means in the form of a belt 15. In the exemplary embodiment shown in the figures, the belt 15 is therefore a toothed belt, so that the belt drive 1 is a toothed belt drive. The belt 15 wraps around the pulley 13 at least partially, in particular around the pulley rotation axis 14, so that the belt 15 can be driven by driving the pulley 13, i.e., by rotating the pulley 13 about the pulley rotation axis 14 relative to the rocker 10 and in particular also relative to the chassis 9. The belt 15 can thus be driven via the pulley 13 by the drive motor, and thus by the output shaft.

[0036] The belt drive 1 also comprises a second pulley 16, which is rotatable about a second pulley rotation axis 17 relative to the rocker 10 and also relative to the chassis 9. The pulley 16 is held on the rocker 10 so as to be rotatable about the pulley rotation axis 17 relative to the rocker 10. The pulley 16 can thus be pivoted with the rocker 10 about the rocker pivot axis relative to the chassis 9. The belt 15 wraps around the pulley 16 at least partially, in particular around the pulley rotation axis 17, so that the pulley 16 can be driven by driving the belt 15 and is thus rotatable about the pulley rotation axis 17 relative to the rocker 10 and also relative to the chassis 9.By driving the pulley 16, i.e., by rotating the pulley 16 about the pulley rotation axis 17 relative to the rocker arm 10, the vehicle wheel 4 can be driven, whereby the motor vehicle (motorcycle 2) as a whole can be driven. It is conceivable for the pulley 16 and the vehicle wheel 4 to be arranged coaxially to one another, so that the wheel rotation axis 11 coincides with the pulley rotation axis 17. Alternatively, it would be conceivable for the wheel rotation axis 11 and the pulley rotation axis 17 to be spaced apart from one another, in particular in the vehicle longitudinal direction, and in particular to run parallel to one another. In particular, it is provided that the pulley rotation axes 14 and 17 are spaced apart from one another at least in the vehicle longitudinal direction and to run parallel to one another.It can be seen that the pulley 13 has a first diameter, in particular a first outer diameter, while the pulley 16 has a second diameter, in particular a second outer diameter, the second outer diameter being larger than the first outer diameter. Therefore, the pulley 13 is also referred to as a belt pinion, and the pulley 16 is also referred to as a belt wheel. The belt 15 has a first toothing facing the pulleys 13 and 16, while the respective pulley 13, 16 has a respective second toothing. Teeth of the first toothing engage in corresponding tooth gaps of the respective second toothing, and teeth of the respective second toothing engage in tooth gaps of the first toothing, whereby the belt 15 is connected to the pulleys 13 and 16 in a torque-transmitting or force-transmitting manner.This allows the pulley 16 to be driven by the pulley 13 via the belt 15.

[0037] A first run of the belt 15, which is upper in the vertical direction of the vehicle and runs between the pulleys 13, 16, is designated by 18. A second run of the belt 15, which is lower in the vertical direction of the vehicle and is opposite the first run 18, in particular in the vertical direction of the vehicle, and runs between the pulleys 13 and 16, is designated by 19.

[0038] The upper run 18 of the belt 15 is assigned, in particular precisely, a first damping element 20, which in the exemplary embodiment shown in the figures is designed as a first roller. The first roller is also referred to as the first damping roller. The run 19 is assigned, in particular precisely, a second damping element 21, which in the exemplary embodiment shown in the figures is designed as a second roller, which is also referred to as the second damping roller. The first damping roller directly touches the run 18, the second damping roller directly touches the run 19, so that when the belt 15 is driven, the damping rollers roll, in particular directly, on the belt 15. As will be explained in more detail below, vibrations of the run 18 are to be dampened by means of the first damping roller, and vibrations of the run 19 are to be dampened by means of the second damping roller.

[0039] The belt drive 1 also has at least or exactly one, in Fig. 1, a particularly schematically illustrated tensioning device 22 is provided in addition to the damping elements 20 and 21, by means of which the belt 15 and thus the strands 18 and 19 are tensioned. The damping rollers exert no force or only a very slight force, also referred to as contact force, on the belt 15, in any case such that the belt 15 and thus the strands 18 and 19 are more strongly tensioned by means of the tensioning device 22 than by means of the damping elements 20 and 21, in particular both when the damping elements 20 and 21 are considered together and when the damping elements 20 and 21 are considered individually.In other words, both in comparison to the damping elements 20 and 21 considered together and in comparison to a respective, individual and thus sole consideration of the respective damping element 20, 21, the tensioning device 22 tensions the belt 15 considerably more strongly, so that the damping elements 20 and 21 neither considered individually nor considered together significantly ensure a tension of the belt 15.As a result, restrictions that usually have to be taken into account for tensioning devices such as tensioning pulleys can be disregarded for the damping elements 20 and 21, so that the vibrations of the strands 18 and 19 can be damped particularly advantageously by means of the damping elements 20 and 21, in particular in such a way that undesirable noises can be avoided and thus a particularly advantageous noise behavior of the belt drive 1, also referred to as belt drive, and thus of the motorcycle 2 as a whole can be represented.

[0040] The respective damping roller is rotatably mounted on a respective associated lever arm 23, 24. In the present case, the damping element 20 is rotatably mounted on the lever arm 23 about a first roller rotation axis 25 relative to the lever arm 23. The damping element 21 is rotatably mounted on the lever arm 24 about a second roller rotation axis 26 relative to the lever arm 24. The roller rotation axes 25, 26 run parallel to one another and are spaced apart from one another. In addition, for example, the respective roller rotation axis 25, 26 runs in the vehicle transverse direction, i.e., parallel to the vehicle transverse direction (double arrow 12). The lever arm 23 is pivotably mounted on a base element 28 about a first lever arm pivot axis 27 relative to the rocker arm 10 and also relative to the chassis 9.The base element 28 is, for example, the swing arm 10 or the chassis 9, or the base element 28 is formed separately from the swing arm 10 and / or separately from the chassis 9 and is held on the swing arm 10 and / or on the chassis 9, in this case on the chassis 9. From . Fig. 2 it is particularly clearly visible that in the embodiment shown in the figures the base element 28 is designed as a plate also referred to as a carrier plate.

[0041] The lever arm 24 is held on a second base element 30 so as to be pivotable about a second lever arm pivot axis 29 relative to the rocker arm 10 or relative to the chassis 9. The base element 30 can be the base element 28, or the base elements 28 and 30 can be formed integrally with one another. Thus, the base element 30 can be the rocker arm 10 or the chassis 9, or the base element 30 can be formed separately from the rocker arm 10 and / or separately from the chassis 9 and held on the rocker arm 10 or on the chassis 9, in this case on the rocker arm 10.

[0042] The previous and following explanations regarding the damping element 20, the lever arm 23 and the base element 28 can also be easily transferred to the damping element 21, the lever arm 24 and the base element 30 and vice versa. Fig.2 that the lever arm 23 is supported on the base element 28 via a mechanical spring element 31, which is designed, for example, as a leg spring, and is thus pivotable relative to the base element 28 about the lever arm pivot axis 27 against a spring force provided or provideable by the spring element 31. The base element 28 has a bearing element 32, designed, for example, as a bearing pin, on which the lever arm 23 is pivotably mounted about the lever arm pivot axis 27 relative to the bearing element 32, in particular by means of a plain bearing 33, so that a low-friction and cost-effective mounting of the lever arm 23 on or at the bearing element 32 can be ensured.In particular, viewed along the lever arm pivot axis 27 and thus in the axial direction of the spring element 31, a friction element 34, such as a corrugated spring, is arranged between the spring element 31 and the base element 28, for example, by means of which advantageous friction can be generated, in particular between the spring element 31 and the base element 28 and / or between the lever arm 23 and the base element 28 and / or between the spring element 31 and the lever arm 23. Vibrations of the strand 18 cause the lever arm 23 and with it the damping element 20 to pivot about the lever arm pivot axis 27 relative to the base element 28, as a result of which the spring element 31 is elastically deformed. As a result of this and / or as a result of the friction mentioned, which occurs when the lever arm 23 and with it the damping element 20 are pivoted about the lever arm pivot axis 27 relative to the base element 28, the vibrations of the strand 18 are advantageously damped.This ensures particularly advantageous noise behavior of the belt drive 1 and thus of the motorcycle 2 as a whole. List of reference symbols 1 belt drive 2 motorcycles 3 vehicle wheel 4 vehicle wheel 5 Floor 6 double arrow 7 Double arrow 8 Drive motor 9 Chassis 10 swingarm 11 Wheel rotation axis 12 double arrow 13 first pulley 14 first pulley rotation axis 15 belts 16 second pulley 17 second pulley rotation axis 18 first strand 19 second strand 20 Damping element 21 Damping element 22 clamping device 23 lever arm 24 lever arm 25 roller rotation axis 26 Roller rotation axis 27 Lever arm pivot axis 28 Basic element 29 Lever arm pivot axis 30 basic elements 31 spring element 32 bearing element 33 plain bearings 34 Friction element

Claims

[1] Belt drive (1) for driving a motor vehicle (2), with a first pulley (13) drivable by a drive motor (8) of the motor vehicle (2), with a belt (15) which has a first strand (18) and a second strand (19) and at least partially wraps around the first pulley (13) and is thereby drivable by the first pulley (13), with a second pulley (16) which is at least partially wrapped by the belt (15) and is thereby drivable by the belt (15), whereby a vehicle wheel (4) of the motor vehicle (2) and thereby the motor vehicle (1) can be driven by means of the belt drive (1) via the second pulley (16), with a first damping element (20) provided in addition to the pulleys (13, 16) and directly contacting the first strand (18) of the belt (15) for damping vibrations of the strand (18), and with a first damping element (20) provided in addition to the pulleys (13, 16) for damping vibrations of the strand (18), and with a the first damping element (20) and in addition to the pulleys (13,16) and directly touching the second strand (19), second damping element (21) for damping vibrations of the second strand (19), , characterized by , that: - the belt drive (1) has at least or exactly one tensioning device (22) provided in addition to the damping elements (20, 21), by means of which the belt (15) is tensioned more strongly than by means of the damping elements (20, 21); - the first damping element (20) is held on a first lever arm (23) which is held on a first base element (28) of the belt drive (1) so as to be pivotable about a first lever arm pivot axis (27); and - the second damping element (21) is held on a second lever arm (24) which is held on the first base element (28) or on a second base element (30) of the belt drive (1) so as to be pivotable about a second lever arm pivot axis (29) spaced from the first lever arm pivot axis (27) and running parallel to the first lever arm pivot axis (27). [2] Belt drive (1) according to claim 1, characterized by that the respective lever arm (23, 24) is supported on the base element (28, 31) via at least one respective spring element (31) and is pivotable relative to the base element (28, 31) against a spring force provided or provideable by the spring element (31). [3] Belt drive (1) according to one of the preceding claims, characterized by that the damping element (20) is a roller. [4] Belt drive (1) according to claim 3, characterized by that the roller is rotatably held on the lever arm (23, 24). [5] Belt drive (1) according to claim 1 or 2, characterized by that the damping element (20) is a slide rail. [6] Motor vehicle (2), with a drive motor (8), with at least one vehicle wheel (4), and with a belt drive (1) designed to drive the motor vehicle (2), which has: - a first pulley (13) drivable by the drive motor (8) of the motor vehicle (2), - a belt (15) which has a first strand (18) and a second strand (19) and at least partially wraps around the first pulley (13) and is thereby drivable by the first pulley (13), - a second pulley (16) which is at least partially wrapped around by the belt (15) and can thus be driven by the belt (15), whereby the vehicle wheel (4) of the motor vehicle (2) and thus the motor vehicle (1) can be driven via the second pulley (16), - a first damping element (20) provided in addition to the pulleys (13, 16) and directly contacting the first strand (18) of the belt (15) for damping vibrations of the first strand (18); and - a second damping element (21) provided in addition to the first damping element (20) and in addition to the pulleys (13, 16) and directly contacting the second strand (19) for damping vibrations of the second strand (19); characterized by , that: - belt drive (1) has at least or exactly one tensioning device (22) provided in addition to the damping elements (20, 21), by means of which the belt (15) is tensioned more strongly than by means of the damping elements (20, 21); - the first damping element (20) is held on a first lever arm (23) which is held on a first base element (28) of the belt drive (1) so as to be pivotable about a first lever arm pivot axis (27); and - the second damping element (21) is held on a second lever arm (24) which is held on the first base element (28) or on a second base element (30) of the belt drive (1) so as to be pivotable about a second lever arm pivot axis (29) spaced from the first lever arm pivot axis (27) and running parallel to the first lever arm pivot axis (27). [7] Motor vehicle (2) according to claim 6, characterized by that the motor vehicle (2) is designed as a motorcycle (2) which has at most or exactly three vehicle wheels (3, 4) or exactly two vehicle wheels (3, 4), wherein at least or exactly one of the vehicle wheels (3, 4) of the motor vehicle (2) can be driven via the second pulley (16) by means of the belt drive (1), whereby the motor vehicle (2) can be driven.

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