CN116044964A

CN116044964A - Damping device and holding device for a damping system of a belt drive

Info

Publication number: CN116044964A
Application number: CN202211308787.9A
Authority: CN
Inventors: 尼古拉斯·舍尔; 斯特凡·彭纳
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2021-10-28
Filing date: 2022-10-25
Publication date: 2023-05-02
Also published as: DE102021128142B3

Abstract

The invention relates to a vibration damping device for a vibration damping system of a drive belt mechanism of a belt drive, comprising at least the following components: at least one sliding surface, which is configured for being in vibration-damped contact with a return section of the drive belt mechanism; a bearing block, which is arranged pivotably about an axial direction on a holder of a transmission housing of the belt transmission for orienting the sliding surface as a function of the orientation of the return section to be damped such that the sliding surface defines a travel direction of the return section to be damped perpendicular to the transverse direction, wherein the bearing block comprises a front abutment surface and a rear abutment surface for abutment against the holder, the damping device having a first rail half and a second rail half. The damping device is characterized in particular in that the front abutment surface is comprised only by the first rail half and/or the rear abutment surface is comprised only by the second rail half. With the damping device proposed here, a reliable lubrication of the belt drive is achieved at the same time as good damping properties.

Description

Damping device and holding device for a damping system of a belt drive

Technical Field

The invention relates to a damping device for a damping system of a drive belt mechanism of a belt drive, having at least the following components:

at least one sliding surface which is configured for bearing against the return section in a vibration-damped manner;

and

a bearing block which is arranged pivotably about an axial direction on a holder of the transmission housing of the belt transmission for orienting the sliding surface as a function of the orientation of the return section to be damped such that the sliding surface defines a travel direction for the return section to be damped which is perpendicular to the transverse direction,

wherein the bearing block comprises a front abutment surface and a rear abutment surface for abutment against the holding device,

wherein the damping device has a first rail half and a second rail half. The damping device is characterized in particular in that the front abutment surface is comprised only by the first rail half and/or the rear abutment surface is comprised only by the second rail half. The invention further relates to a holding device for a damping system of a drive belt mechanism of a belt drive, to a damping system for a drive belt mechanism of a belt drive having such a holding device, and to a belt drive for a drive assembly having such a damping system.

Background

Belt drives for motor vehicles, also known as cone pulley belt drives or CVT (english: continuous variable transmission (continuously variable transmission)), comprise at least one first cone pulley set arranged on a first axle and a second cone pulley set arranged on a second axle, and a belt mechanism arranged for transmitting torque between the cone pulley sets. The cone pulley pair comprises two cone pulleys which are oriented towards each other by means of corresponding cone faces and which are axially movable relative to each other. Such belt drives generally comprise at least one first and one second conical wheel pair, each having a first conical wheel, also called a running wheel (Losscheibe) or a displacement wheel (Wegscheibe), which is displaceable along the axis of the shaft, and a second conical wheel, also called a stationary wheel, which is fixed in the direction of the axis of the shaft, wherein, due to the relative axial movement between the running wheel and the stationary wheel, a drive belt mechanism provided for transmitting torque between the conical wheel pairs runs on a variable effective circle due to the conical surfaces. In this way, different rotational speed and torque ratios from one cone wheel pair to the other can be set steplessly.

Belt drives of this type have long been known, for example, from DE 100 17 005A1 or WO 2014/012741 A1. When the belt drive is in operation, the belt drive is displaced in the radial direction between an inner position (small effective circle) and an outer position (large effective circle) by means of a relative axial movement of the cone wheels, i.e. the cone wheel pairs. The drive belt mechanism forms two return sections between two cone pulley pairs, wherein one of the two return sections forms a tensioned return section and the other one forms a relaxed return section (depending on the configuration and direction of rotation of the cone pulley pairs), or one of the two return sections forms a tensioned return section and the other one forms a relaxed return section.

In this belt drive, at least one damping device which is pivotably mounted on the holding device is provided in the free space between the conical pulley pairs. Such a damping device can be arranged at the tension return and/or relaxation return of the belt mechanism and serve for guiding and thus limiting the vibration of the belt mechanism. It has also been shown that improved acoustic effects can be achieved when the vibration damping device is driven in operation with a change in the transmission ratio by means of the guided return section. As a result, the damping device is mounted on its holder in an axially movable manner.

Due to the predetermined position of the return section or of the cone pulley pair, i.e. for example during underdrive or overdrive, additional and/or increased heat dissipation takes place within the belt drive at predetermined areas, so that in operation in addition to mechanical loads, thermal loads additionally occur. The additional load should be disabled at any operating time so that a predetermined service life can be maintained. In conventional belt drives, the cooling of the belt drive takes place, for example, by means of a continuously introduced liquid running medium.

Disclosure of Invention

The present invention is based on the object of at least partially overcoming the disadvantages known from the prior art. Advantageous embodiments of the invention are explained below. The features of the invention can be combined in all technically significant ways and methods, wherein for this purpose the features from the following description and from the drawings can also be used, including additional embodiments of the invention.

The invention relates to a vibration damping device for a vibration damping system of a drive belt mechanism of a belt drive, having at least the following components:

at least one sliding surface which is configured for bearing against the return section of the drive belt mechanism in a vibration-damped manner; and

wherein the damping device has a first rail half and a second rail half.

The damping device is primarily characterized in that the front abutment surface is comprised only by the first rail half and/or the rear abutment surface is comprised only by the second rail half.

In the following, reference is made to the mentioned direction of travel (also referred to as longitudinal direction) when, unless explicitly indicated otherwise, a transverse direction and an axial direction perpendicular to the direction of travel, thereby developing a cartesian coordinate system, and corresponding terms, are used. If the travel direction, the axial direction and the transverse direction are referred to here, this means not only a positive direction in the developed coordinate system but also a negative direction in the developed coordinate system. Furthermore, reference is made to a belt mechanism which, in the installed state, forms a belt circle surrounding a set effective circle of two cone pulley pairs of the belt drive, and with respect to the belt circle is referred to internally, i.e. in the (imaginary) plane of the belt circle, is enclosed by the belt mechanism, and is referred to externally and corresponding terminology is used. The designations left return section and right return section relate to the sides of the travel direction in parallel planes relative to the pivot axis, which are arbitrarily selected (interchangeable) and are purely for simplicity of illustration. The use of numerical references in the foregoing and following description is for explicit distinction only and does not indicate the order or prioritization of the elements described, to the contrary, unless explicitly indicated. An ordinal number greater than one does not cause the necessity of the forced presence of additional such components.

According to the prior art, damping devices are provided for damping belt drives, for example endless chains or belts, belt drives having two conical wheel pairs. For example, the belt means is embodied as a traction means or as a metal belt. This means that the damping device is configured for one of the two return sections of the drive belt mechanism, for example for forming a traction return section of the tensioning return section when configured as a traction mechanism drive. Alternatively, the slack loop or both loops are each guided by means of such a damping device. If guidance of the return section is involved here, damping of the return section is thereby also meant, since the belt mechanism accelerates the conical pulley pairs upstream in the direction of travel laterally outwards in a direction deviating from the ideal tangential direction of the set effective circles of the two conical pulley pairs when transitioning into the return section. From there, shaft vibrations are caused which impair the efficiency and cause noise emissions. For example, vibration frequencies (stress-dependent) of the return section to be guided up to approximately 800hz [800 hz ] occur in belt drives and are acoustically dependent.

In one embodiment, the damping device serves as a carriage or sliding guide (a single-sided, generally inner device at the return section). Alternatively, the damping device is embodied as a rail. For guiding or damping, such a rail has two sliding surfaces which are oriented transversely opposite one another, wherein the inner sliding surfaces are disposed from the transversely inner side and the outer sliding surfaces are disposed from the transversely outer side for bearing against the return section to be guided during operation. In operation, the sliding surface is permanently or vibration-state-dependent against the return section to be guided. The sliding surface thereby forms a bearing surface extending in the direction of travel, which suppresses the amplitude of the transverse orientation of the shaft vibrations of the return section to be damped.

The vibration damping device comprises a bearing block, wherein the bearing block is positioned on the holding means. The holding device is surrounded by a transmission housing of the belt transmission. In one embodiment, the retaining means is formed integrally with the transmission housing. In a preferred embodiment, the holding device is formed separately from the gear housing and is connected to the gear housing fixedly or in an articulated manner. The bearing block is pivotally supported, for example, in the manner initially described, on an axially oriented pivot shaft formed by the holding device.

The bearing blocks of the damping device are configured in conjunction with the holding device, so that they can achieve a correspondingly oriented (passive) orientation of the sliding surface of the damping device relative to the return section to be damped. The damping device can thus be pivoted about the axial direction by means of the bearing seat and the holding device in cooperation (following the return section to be damped). The sliding surface defines a travel direction perpendicular to the transverse direction for the return section to be damped. Thus, the travel direction, the lateral direction and the axial direction develop a cartesian coordinate system (moving together in operation). Furthermore, in some applications, the damping device may be moved laterally such that the damping device follows a (steeper elliptical) curve deviating from a circular orbit about the pivot axis. The pivot axis thus forms the center of a (two-dimensional) polar coordinate system, wherein the (pure) pivot movement thus corresponds to a change in polar angle and the lateral movement corresponds to a change in polar radius. For the sake of overview, said translational movement superimposed, i.e. overlapping, with the pivoting movement is omitted hereinafter and is summarised as the term pivoting movement. The pivot axis is oriented transversely to the direction of travel of the belt mechanism, i.e. axially. This ensures that, when adjusting the effective circle of the belt drive, the damping device can follow the new (tangential) orientation of the belt drive derived therefrom in a guided manner. Although the travel direction is intended to form an ideal shortest connection between the applied effective circles of the two cone pulley pairs, in dynamic operation the orientation of the respective return segment may deviate briefly or permanently from the ideal shortest connection.

The bearing block is designed in such a way that it comprises a front abutment surface and a rear abutment surface for abutment against the holding device. The contact surfaces are each formed by at least one element of the vibration damping device (for example by at least one pin as an extension in the transverse direction) and are positioned such that they lie opposite one another. The abutment surfaces are therefore referred to herein as front and rear abutment surfaces, wherein the front and rear are defined herein in the direction of travel. The contact surface is thus configured with a planar expansion transverse to the direction of travel.

In this embodiment, it is now proposed that the damping device has a first rail half and a second rail half, wherein preferably a connecting device is provided, by means of which the two rail halves are fixed to one another axially and in the direction of travel. The damping device is thus formed in multiple parts, preferably in two parts, wherein (preferably only) a first rail half and a second rail half are provided. The at least one sliding surface preferably consists of a partial surface of the rail half. In a multi-piece embodiment, the two rail halves are preferably produced separately from one another. The two individual rail halves are fixed to each other axially and in the direction of travel by means of a connecting device. In a common embodiment, a snap hook is provided for this.

The rail halves of the damping device are preferably each formed in one piece, particularly preferably by means of injection molding, for example from polyamide [ PA ], preferably PA 46.

It is proposed here that the front abutment surface is comprised only by the first rail half and/or that the rear abutment surface is comprised only by the second rail half. For example, the (sole) front abutment surface is formed by a first rail half and the (sole) rear abutment surface is formed by a second rail half. Alternatively, the front abutment surface and the rear abutment surface are formed by one of the two rail halves, wherein only the (further) front or rear abutment surface is formed by the respective other rail half. It is noted that such an abutment surface is not necessarily a one-piece, communicating surface, but is formed, for example, by a plurality of (individual) elements. In the previously known damping device, four separate pins are provided in the outlet device in the holding device for forming a front abutment surface and a rear abutment surface, which are arranged in the axial direction to the left and right of the opening of the outlet device. In the case of an axial displacement of the damping device, the covering between the pin and the opening and/or the limiting of the extreme position occurs at least in the extreme position. The arrangement of the opening of the outlet device is freely selectable by reducing the abutment surface on the front and/or rear to only one of the two rail halves. In this way, a large axial stroke length for the movement of the damping device can be achieved at least on the side (front or rear) having the single rail half with the abutment surface. For example, only the front abutment surface is formed by the first rail half, and the second rail half does not comprise the front abutment surface. The front abutment surface can then be arranged offset so that it never overlaps, i.e. does not cover, the opening of the outlet device over the axial travel of the vibration damping device. It is particularly preferred that two or more openings are included on this side (i.e. for example the front) of the outlet device, and that corresponding (front) abutment surfaces are arranged between said openings or at least never cover one of the openings at all times.

In an advantageous embodiment of the damping device, it is furthermore provided that at least one of the contact surfaces is formed in an overlapping manner in the axial direction with the respective other rail half.

For the arrangement of the contact surfaces of one rail half that is as far away from the respective other rail half as possible and/or that has as wide an axial extent as possible, the relevant contact surfaces are formed to overlap axially, i.e. to project axially into the region of the respective other rail half. The abutment surface thereby extends axially beyond the connection plane of the two rail halves or is arranged only in the region of the respective other rail half.

According to a further aspect, a damping device for a damping system of a drive belt mechanism of a belt drive is proposed, having at least the following components:

at least one sliding surface, which is configured for bearing against the return section of the belt drive in a vibration-damped manner; and

a bearing block, which is arranged pivotably about an axial direction on a holder of a transmission housing of the belt transmission for orienting the sliding surface as a function of the orientation of the return section to be damped, such that the sliding surface defines a travel direction for the return section to be damped that is perpendicular to the transverse direction,

Wherein the bearing block comprises a front abutment surface and a rear abutment surface for abutment against the holding device.

The damping device is characterized in particular in that the front abutment surface and/or the rear abutment surface are each formed by a single pin.

The damping device and its embodiments presented here are as identical as possible to the above description of the damping device purely for the sake of overview, without excluding generalizations, so that reference is made in this regard to the description there. It should be noted that the damping device is, however, not necessarily formed in two parts. Furthermore, in an advantageous embodiment of the damping device, it is proposed that the damping device is formed according to the embodiments described above.

It is now proposed that each abutment surface is formed by a respective one of the pegs, so that in one embodiment the front abutment surface is formed by a first peg and the rear abutment surface is formed by a second peg. The bolt here comprises and has an extension in the transverse direction from the bearing block of the damping device. The respective abutment surface extends on the side of the pin which in use faces the support section, wherein the abutment surface is movable relative to the support section.

In a preferred embodiment, one (preferably both) of the pins is formed in one piece with the bearing block or the damping device. For example, such bolts, including the abutment surfaces, together with the damping device are produced in a common mold, preferably by means of injection molding. The pins are preferably arranged offset from one another in the axial direction in the damping device. Preferably, the pegs are spaced apart from each other along the axial direction.

In an alternative embodiment, the pin is arranged with the aid of the corresponding abutment surface such that it is flush in the direction of travel and is positioned centrally with respect to the sliding surface or eccentrically at the bearing block in the axial direction. The two pins are designed and arranged in such a way that they rest against the holding device during operation. The damping device thus has exactly two pins, one of which is arranged in the direction of travel before the holding device and the other is arranged after the holding device during operation.

In an advantageous embodiment of the damping device, it is furthermore provided that the damping device has a first rail half and a second rail half, wherein a connecting device is provided, by means of which the two rail halves are fixed to one another axially and in the direction of travel, wherein the first rail half and the second rail half preferably have identical structures, particularly preferably are formed identically.

Such a damping device is formed in multiple parts, preferably in two parts, wherein (preferably only) a first rail half and a second rail half are provided. In this embodiment, the two rail halves are preferably manufactured separately from one another. The two individual rail halves are fixed to each other axially and in the direction of travel by means of a connecting device. In one embodiment/for this purpose, one or more holding means are provided on at least one (preferably two) of the rail halves, which form the connecting device. Preferably, each track half has a first retaining means (e.g. a snap hook) and a second retaining means (e.g. a hook receiving portion) which cooperates with the first retaining means of the respective other track half.

In a preferred embodiment, two identical rail halves are provided. For example, such rail halves can be applied axially from both sides to the return section to be damped during installation, or one rail half can already be installed and the other rail half can be applied axially from the opposite side of the return section. Preferably, the snap hooks are guided (respectively due to the structural identity of the rail halves) into the mating hook receptacles of the respective other rail half. The two rail halves are preferably of generally identical design, i.e. identically formed, so that they can be produced by means of the same production method throughout injection molding with the aid of a single injection mold. Thereby, the production costs are reduced and there is no risk of confusion in the installation. At least one of the sliding surfaces is formed by a partial surface of one of the rail halves, which is formed by one of the two rail halves.

Furthermore, it is proposed in an advantageous embodiment of the damping device that a loss-preventing hook for the damping device is formed at the free end of the bearing block, wherein preferably such a hook is provided at each contact surface, and particularly preferably the hooks are formed overlapping in the direction of travel.

In this embodiment, the bearing support has at least one free end in the region of the contact surfaces (preferably one free end for each contact surface). At the free end, the hook is formed in such a way that the sections of the bearing block forming the abutment surface and the free end transition from an extension extending substantially in the transverse direction to an extension extending substantially in the direction of travel (wherein substantially in the case indicated the main extension direction deviates from the transverse direction or the direction of travel by no more than 15 °, preferably no more than 10 ° or 5 °). The hook preferably forms part of the abutment surface on the side facing the return section accommodated by the damping device. For example, the hook can be part of a peg, wherein the hook is formed at the free end of the peg in such a way that: the peg is bent in the direction of the axial centre of the holding means.

The hooks are configured such that the vibration damping device is excluded from sliding out in the lateral direction. In a preferred embodiment, such hooks are included at each abutment surface. Due to the opposite arrangement of the abutment surfaces, the hooks are also arranged opposite one another, so that a loss prevention function is obtained. For example, the hooks are formed in one piece with the rail halves and/or with at least one peg. Thus, a predetermined rigidity of the rail halves may be embodied.

In a particularly preferred embodiment, the hooks are formed overlapping in the direction of travel, so that the hooks are embodied as anti-lost elements surrounding the holding device. For example, each side forms an abutment surface for one of the pins. The peg is configured such that it has an extension in the direction of travel, i.e. constitutes a hook, in addition to a lateral extension. The hooks or pegs are preferably formed in one piece with the corresponding rail halves.

It is also applicable to the embodiment described that the two rail halves are preferably formed in an overall identical manner, i.e. identical, so that they can be produced by the same production method at all times (for example, in the case of injection molding by means of a single injection mold). In this embodiment, the abutment surfaces or pins are axially offset. The simultaneous axial offset of the pins and the overlapping of the contact surfaces in the direction of travel allow a simplified installation of the rail halves on the holding device with simultaneous loss prevention of the damping device in the transverse direction

According to a further aspect, a holding device for a damping system of a drive belt mechanism of a belt drive is proposed, having at least the following components:

a fastening section for fixing the holding device in the gear housing;

-a support section having an extension in an axial direction; and

Outlet means for discharging the liquid running medium in a direction transverse to the axial direction,

wherein the damping device can be accommodated by the support section such that the damping device can pivot about the axial direction depending on the orientation of the return section to be damped.

The holding device is characterized in particular in that the outlet device has at least one opening for the output of the liquid operating medium, wherein the opening is arranged outside the axial center between the axial extreme positions of the belt drive when the belt drive is in use.

The holding device proposed here is configured as described hereinabove such that the damping device for the return section of the drive belt mechanism of the belt drive is pivotably supported, so that if the return section pivots when the gear ratio changes, the damping device can follow the movement of the return section to be damped. The holding device is fixedly arranged in the transmission housing, so that the belt mechanism is pivotally mounted with respect to the transmission housing.

The holding device comprises a fastening section for fixing the holding device in the transmission housing. The fastening sections comprise, for example, in each case a connecting piece which has a hole for screwing with a housing wall of the transmission housing, so that a movement of the holding device is excluded. In one embodiment, the fastening section is formed in one piece with the transmission wall of the transmission housing, so that no further tightening at the end of the fastening section is required.

Furthermore, the holding device comprises a support section which extends axially, so that the contact surface of the damping device is brought into contact with the support section. The bearing section is configured such that the damping device can be pivotally accommodated about an axial direction depending on the orientation of the return section to be damped. Furthermore, the axial extension of the bearing section is preferably configured such that a fastening section is provided at each of the two ends of the bearing section, so that the transmission housing or the so-called transmission pot is bridged by the bearing section and the (two) fastening sections.

In one embodiment, the holding device comprises a single support section for the (single) vibration damping device, and in another embodiment two support sections for the (single) vibration damping device, respectively. Such a support section has a (theoretical) pivot axis about which the damping device can pivot.

The holding device is configured such that it comprises an outlet device. The outlet device is oriented in a direction transverse to the axial direction for the output of the liquid operating medium. A portion of the outlet means is comprised by the support section. The liquid operating medium used is also used, for example, in other components of a drive train, such as an internal combustion engine of a motor vehicle.

The outlet device comprises at least one opening, so that, for example, a liquid operating medium can be fed into the holding device or the outlet device by means of a feed line and can be introduced into the gear housing transversely to the axial direction by means of the at least one opening. The at least one opening is formed, for example, as a hole and/or a nozzle. In one embodiment, the plurality of openings is comprised by the outlet device.

Furthermore, the opening is positioned in the holding device such that the opening is arranged outside the axial center between the maximum axial positions of the belt mechanism when used in the belt drive. When the belt drive is in operation, the belt drive is movable in the axial direction in relation to the effective circle of the conical pulley pair. The damping device follows the belt mechanism as it moves and occupies an axial position defined by the belt mechanism. The abutment surface or the pin, if appropriate, which abuts against the holding device or the outlet device is arranged on the damping device in such a way that it does not cover the opening due to the positioning of the opening described above or covers the opening only in a predefined position of the belt mechanism.

In one embodiment, the distance between the two pins in the axial direction is at least as large as the diameter of the opening, if necessary as large as the diameter of the larger of the two openings.

Furthermore, in an advantageous embodiment of the holding device, it is proposed that the outlet device comprises a single front opening and a single rear opening in the front and back, wherein the front and rear openings are arranged offset from one another in the axial direction.

It is now proposed that the outlet device comprises at least two openings, wherein the front opening and the rear opening are arranged on the outlet device in the direction of travel. The outlet means are arranged such that the openings are arranged offset from each other in the axial direction. It is noted that the front opening and the rear opening do not have a continuous hole flush or in the direction of travel. The openings have such an axial offset that, by means of the contact surfaces of the damping device, complete covering of the outlet device or the openings can be dispensed with in operation or can only be embodied in predetermined positions of the drive belt mechanism.

Furthermore, it is proposed in an advantageous embodiment of the holding device that the outlet device comprises two front openings forward and/or two rear openings rearward.

It is noted that the two front openings and/or the two rear openings are axially offset from each other. In a preferred embodiment, the two front openings and/or the two rear openings formed adjacent in the axial direction in the outlet device have different diameters. Due to the different diameters, the pressure and/or volume changes as the liquid operating medium leaves according to the opening. The openings are arranged on the outlet device in such a way that, in operation, the belt drive can be wetted with the liquid running medium with a predetermined efficiency in a predetermined position of the belt drive or of the vibration damping device.

In one embodiment, the opening is designed as a control means for controlling the volumetric flow and/or the outflow pressure of the operating medium. For this purpose, for example, one or more openings can be partially or completely covered in a specific operating state. By at least partially covering the opening, the volumetric flow through the opening can be reduced and/or the outflow pressure of the operating medium can be increased. At the same time, by at least partially covering the opening, the outflow pressure and/or the volumetric flow at the at least one further opening can be increased. Preferably, the opening is covered by the abutment surface of the bearing block in a specific operating state during operation when it is designed to be at least partially covered, i.e. arranged in the holding device. Whether and how the volume flow and/or the outflow pressure leaving the opening is changed by partial covering is dependent on the control of the operating medium. The control is, for example, a damping device, a damping system, a powertrain and/or an operating medium control of the vehicle. Such a control of the operating medium is, for example, volume control or pressure regulation, by means of which the pressure or the volume flow of the liquid operating medium can be controlled at one or more points. For example, the inlet pressure or the inlet volume flow of the liquid operating medium upon entry into the outlet device is controllable by means of the operating medium control. In an exemplary embodiment, the transport of the liquid operating medium is volume-controlled, so that the operating medium can be introduced into the outlet device, for example, with a constant volume. If a predetermined operating state exists in the belt drive, such that, for example, an increased heat output of the belt drive requires an increased amount of operating medium at a specific location (e.g., in a specific distance from the holder and/or in the axial direction), it is advantageous to cover at least one opening for the belt drive in a predetermined manner. Due to the controlled (e.g. constant) volume flow of the liquid operating medium within the holding device, an increased amount of operating medium can be discharged from the remaining openings by means of at least partially covering the openings. At the same time, the exit pressure of the liquid operating medium is increased, so that the exit speed is increased. As a result of the increased quantity of liquid running medium being delivered to a specific location, an increased heat output in the belt drive can be compensated. In an alternative embodiment, the delivery is pressure-controlled, so that the operating medium can be introduced into the outlet device, for example, at a constant volume.

According to a further aspect, a damping system for a drive belt mechanism of a belt drive is proposed, which has at least the following components:

a holding device according to the embodiment according to the description above, and

according to the vibration damping device according to the above described embodiment,

wherein the damping device is pivotably guided about the axial direction by means of the retaining device when used in the belt drive.

By means of the damping system proposed here, damping and/or guidance of the belt mechanism of the belt drive can be shown. The belt drive is surrounded by a drive housing, so that the belt drive is protected from external influences, such as, for example, contamination and/or impurities. A retaining device is disposed within the transmission housing.

Here, a holding device for pivotably accommodating a vibration damping device is proposed, wherein the holding device is formed according to one of the holding devices according to one of the above embodiments. The holding device is fixedly connected to the transmission housing by means of at least one fastening section, so that the holding device is fixed within the transmission housing.

The proposed vibration damping device, which in use is pivotably supported about an axial direction by means of a holding device, is constructed according to one of the above embodiments. The damping device is configured for guiding and/or damping the drive belt mechanism. In addition to the circumferential movement of the belt mechanism in the direction of travel, a movement in the transverse direction also occurs when the gear ratio of the belt drive is changed, so that the damping device is pivotably guided about the axial direction as a combined movement by means of the holding device.

According to another aspect, a belt drive for a powertrain is proposed, having at least the following components:

a transmission input shaft with a first cone pulley pair,

-a transmission output shaft having a second cone wheel set;

-a drive belt mechanism by means of which the first cone pulley pair is connected in torque-transmitting manner with the second cone pulley pair; and

according to one embodiment of the damping system according to the above description, the damping device is applied with at least one sliding surface against a return section of the belt mechanism for damping the belt mechanism.

By means of the belt drive proposed here, torque can be transmitted from the transmission input shaft to the transmission output shaft in a step-up or step-down manner, and vice versa, wherein the transmission can be set at least in part steplessly. The belt drive is, for example, a so-called CVT with a traction mechanism or a metal belt. The belt mechanism is, for example, a multi-link chain. The belt mechanism is pushed against the conical wheel pairs from the radially inner side to the radially outer side and vice versa, respectively, so that a variable effective circle appears on the respective conical wheel pair. The ratio of the torques to be transmitted is derived from the ratio of the effective circles. The two effective circles are connected to each other by means of an upper return section and a lower return section of the drive belt mechanism, namely a tension return section and a relaxation return section, which are also referred to as traction return section or push return section.

Ideally, the return section of the drive belt mechanism forms a tangential orientation between the two effective circles. The tangential orientation is superimposed with the induced shaft vibrations, which are caused, for example, by a limited division of the belt mechanism and a premature departure from the effective circle due to the escape acceleration of the belt mechanism.

The damping device is configured for bearing with its at least one sliding surface against a corresponding bearing surface of a return section to be damped, for example a tensioning return section, such that such shaft vibrations are suppressed or at least damped. In addition, for one application, a transverse guide is provided, i.e. a guide surface is provided on one or both sides in a plane parallel to the formed belt circle of the belt means. Then, a sliding channel is thereby formed in the case of a sliding rail having an outer sliding surface and an inner sliding surface. The return section is thus guided in a parallel plane with respect to the sliding surface, and the travel direction of the return section is in said parallel plane. For the best possible damping, the sliding surface is embodied as close as possible to the return section of the belt mechanism. Alternatively, the damping device is axially fixed and the guided return section can be moved (axially) relative to the damping device.

In order to allow the damping device to follow the orientation of the return section, a pivot bearing is formed by the holding device, on which pivot bearing the damping device is supported with its bearing seat so that a pivoting movement according to the description above can be carried out. The damping device and the holding means form a damping system according to the embodiments described above. The components of the belt drive are typically surrounded and/or supported by a drive housing. For example, a holding device (also referred to as a pivot bearing) for the bearing block is fastened and/or movably mounted as a holding tube on the transmission housing. The transmission input shaft and the transmission output shaft extend from the outside into the transmission housing and are preferably supported on the transmission housing by means of a bearing. The conical wheel set is surrounded by means of a transmission housing, and the transmission housing preferably forms a support for axially actuating the movable conical wheel (running wheel). Furthermore, the transmission housing preferably forms an interface for fastening the belt transmission, for example for supplying hydraulic fluid and/or liquid operating medium. For this purpose, the gear housing has a plurality of boundary conditions and must be adapted to a predetermined installation space. The shape and the inner wall of the movement of the limiting member result from said mutual cooperation.

According to another aspect, a powertrain is proposed, having: at least one drive machine, each of the at least one drive machine having a machine axis; at least one consumer; and a belt drive according to the embodiment described above, wherein the machine shaft can be connected with at least one consumer for transmitting torque with a preferably steplessly variable transmission ratio by means of the belt drive.

The drive train is configured for transmitting the torque provided by the drive machine, for example an internal combustion engine and/or an electric drive machine, and output via its machine shaft, for example an internal combustion engine shaft and/or an (electric) rotor shaft, for the purpose on demand, i.e. taking into account the required rotational speed and the required torque. For example, one use is a generator for providing electrical energy. In order to transfer torque specifically and/or by means of a gear change transmission having different gear ratios, the use of the belt drive described above is particularly advantageous, since a large transmission spread can be achieved in a small space and the drive machine can be operated in a small optimum rotational speed range. By contrast, by means of a correspondingly configured torque transmission system, it is also possible for inertial energy, for example introduced by the propulsion wheel, to be absorbed by means of the belt drive to the generator for recuperation, i.e. for electrical storage of braking energy. In a preferred embodiment, a plurality of drive machines are furthermore provided, which can be operated in series or parallel connection or in a manner decoupled from one another and whose torque can be provided in a satisfactory manner by means of the belt drive according to the description above. An example of application is hybrid drive, which includes an electric drive machine and an internal combustion engine.

According to a further aspect, a motor vehicle is proposed, which has at least one propulsion wheel which can be driven by means of a drive train according to the embodiment described above for propelling the motor vehicle.

Currently, most motor vehicles have a front wheel drive and drive machines, such as internal combustion engines and/or electric drive machines, are arranged partially in front of the driver's cabin and transversely to the main driving direction. The radial installation space is particularly small in this arrangement, so that it is particularly advantageous to use a belt drive of small construction dimensions. The use of belt drives in motor vehicles is of similar design, for which increased power is always required while maintaining the same installation space compared to previously known motor vehicles. The problem is exacerbated with the mixing of the powertrain.

The problem is exacerbated in small car class passenger cars classified according to europe. The plants used in passenger cars of the small vehicle class are not significantly reduced relative to passenger cars of the larger vehicle class. The installation space available in a small vehicle is therefore significantly smaller. A similar problem arises in hybrid vehicles, in which a plurality of drives and clutches are provided in the drive train, so that the available installation space is reduced in comparison with non-hybrid motor vehicles.

Passenger cars are assigned vehicle grades based on, for example, size, price, weight, and power, wherein the definition varies continuously according to market demand. In the united states market, vehicles classified according to the class of small vehicles and micro vehicles are assigned to the class of ultra-small vehicles, while in the uk market, they correspond to the ultra-micro class or city vehicle class. General up-! Or reynolds two is an example of a class of micro-car. Alpha romidepa MiTo, mass Polo, ford ka+ or reynolds Clio are examples of small car grades. BMW 330e or Toyota Yaris Hybrid is a known Hybrid vehicle. For example, audi A6 50TFSI e or BMW X2 xTris 25e are known as mild hybrid vehicles.

Drawings

The invention described above is explained in detail below in the relevant technical background with reference to the associated figures, which show preferred embodiments. The invention is not in any way limited by the purely schematic drawings, wherein it is to be noted that the drawings are not dimensionally accurate and are not suitable for defining dimensional proportions. The drawings show:

FIG. 1 shows a view of a vibration damping system in a direction of travel during low speed transmission;

FIG. 2 shows a view of the vibration damping system according to FIG. 1 in the direction of travel during overdrive;

FIG. 3 shows a perspective view of the vibration damping system according to FIGS. 1 and 2;

FIG. 4 shows a schematic view of a vibration damping system in a belt drive; and

fig. 5 shows a drive train with a belt drive in a motor vehicle.

Detailed Description

Fig. 1 shows a view of the vibration damping system 2 in the low-speed transmission state in the travel direction 13 of the first return section 7 (not shown here, see fig. 5). The axial direction 12 extends horizontally from right to left according to the view, the transverse direction 14 extends vertically from bottom to top according to the view, and the travelling direction 13 points towards the drawing plane. The damping device 1, which is formed exclusively by the two identical rail halves 17, 18, is mounted pivotably on the holding device 10, for example on a holding tube with an outlet device 27 in the travel direction 13. The damping device 1 and the holding device 10 together form a damping system 2. The pivot axis 36 of the damping device 1 formed by the holding means 10 extends parallel to the axial direction 12 in the view. It is pointed out that the pivot axis 36 does not coincide with the central axis of the illustrated holding tube of the holding device 10 in every operating state.

In this case, the output-side loose pulley 37 and the output-side fixed pulley 38 of the first (input-side) cone pulley pair 34 of the belt drive 4 are shown in a hidden manner in front of the vibration damping system 2. Here, the vibration damping device 1 with the output-side running wheel 37 is shown in a low-speed transmission state. That is, a small (input-side) effective circle 39 is set at the first cone pulley pair 34, and a large (output-side) effective circle 40 is set at the second cone pulley pair 35. An extensive explanation of this is with reference to the view in fig. 4. In order to reduce the effective output-side circle 39, the output-side running wheel 37 can be moved in the axial direction 12 toward the output-side fixed wheel 38. By means of the two

rail halves

17, 18, a sliding channel 41 (see fig. 4) for the belt mechanism 3 is formed, wherein the sliding channel 41 has an inner sliding surface 5 and an outer sliding surface 6 opposite thereto, with the transverse direction 14 being oriented normal thereto. The inner slide surface 5 is connected to the outer slide surface 6 by means of a first web 42 comprised by the first rail half 17 and a second web 43 comprised by the second rail half 18 (covered here, see fig. 2). Purely optionally, the first web 42 and the second web 43 are each formed by an axial sliding surface 44, 45 facing the

return section

7, 8 to be damped, so that the

return section

7, 8 is guided axially in the sliding channel 41 or the damping device 1 is driven during the axial displacement of the

return section

7, 8 by a change in the transmission ratio of the belt drive 4. Purely alternatively, the two individual rail halves 17, 18 are fixed to one another axially and in the direction of travel 13 by means of a connecting device (not shown here).

The holding device 10 now comprises a support section 26, a fastening section 25 and an outlet device 27. The bearing section 26 is configured to accommodate the bearing block 9 comprised by the vibration damping device 1, so that a pivotable orientation of the sliding

surfaces

5, 6 about the axial direction 12 is possible depending on the orientation of the return section 7 to be damped. The fastening section 25 is formed from the holding device 10, purely optionally as a flange-one piece, and is provided for fastening the holding device 10 in the gear housing 11. The outlet device 27 comprises in the illustrated embodiment a first front opening 28, a second front opening 29 and (not shown here, since it is arranged on the facing away side) a first rear opening and a second rear opening in the direction of travel 13, so that, for example, by means of a conveying line arranged in the holding device 10, liquid running medium can be distributed into the gear housing 11 transversely to the axial direction 12 by means of the

openings

28, 29. Furthermore, the

openings

28, 29 are arranged in the holding device 10 such that the

openings

28, 29 are arranged outside the axial center 30 between the maximum axial positions of the vibration damping device 1 (which are moved in the axial direction 12) when used in the belt drive 4. The bearing block 9 of the damping device 1 is arranged below the inner sliding surface 5 in the view and has a front contact surface 15 and a rear contact surface 16, which are covered in this case, for contact with the holding device 10. The front abutment surface 15 and the rear abutment surface 16 are positioned such that the abutment surfaces 15, 16 are arranged opposite one another, so that, in operation, the support section 26 of the holding device 10 is closed. The front abutment surface 15 is formed by a first peg 19 and the rear abutment surface 16 is formed by a second peg 20, wherein purely alternatively the first peg 19 is formed by a first rail half 17 and the second peg 20 is formed by a second rail half 18. The first peg 19 and the second peg 20 are spaced apart by a predetermined distance in the axial direction 12. An extensive explanation of the bearing block 9 is made in this connection with the view in fig. 3.

In the operating state shown, none of the pins 19, 20 covers one of the

openings

28, 29. Purely alternatively, the operating state can be the smallest possible gear ratio of the belt drive 4. If the gear ratio should be increased, for example, in order to enter an operating state of a low-speed transmission, the effective circle 39 on the input side is reduced. In this case, the movable wheel 37 on the input side moves rightward according to the view so as to increase its distance from the fixed wheel 38 on the input side. Here, the vibration damping device 1 is also moved rightward via the belt mechanism 3. The first peg 19 is thus moved away from the first front opening 28 towards the second front opening 29. The operating state of the maximum gear ratio is preferably designed such that the first pin 19 does not reach the second front opening 29 and therefore does not cover it in any operating state (see fig. 2). In the same way, purely alternatively, the second peg 20 and the rear opening are arranged relative to each other.

Fig. 2 shows a view of the vibration damping system 2 according to fig. 1 in an overdrive state in the direction of travel 13 of the first return section 7 (not shown, see fig. 5). Here, a small effective circle 39 on the output side is set by the axial distance between the movable sheave 37 on the output side and the fixed sheave 38 on the input side. In this operating state, and in an operating state which can be set (for example, continuously) between the operating states shown in fig. 1 and 2, no covering of one of the

openings

28, 29 occurs.

Fig. 3 shows a perspective view of a damping device 1 for a damping system 2 according to fig. 1 and 2 and in this connection reference is made to the description there.

In this case, the rear abutment surface 16 (in the direction of travel) is clearly visible, which has a front abutment surface 15 and a rear opposite abutment surface 20, wherein the two pins 19, 20 are axially spaced apart. The front abutment surface 15 has in the embodiment shown a first free end 21 with a first hook 23 in the travel direction 13. The rear abutment surface 16 has in the embodiment shown a second free end 22 with a second hook 24 opposite the direction of travel 13. Purely schematically, a loss protection for the vibration damping device 1 is formed by two hooks 23, 24, for which hooks 23, 24 are arranged overlapping in the travel direction 13.

Fig. 4 shows a schematic illustration of a vibration damping system 2 (for example according to fig. 1 and 2) in a belt drive 4, wherein a return section 7 of a drive belt mechanism 3 is guided by means of a vibration damping device 1 (as shown in fig. 3 and described above) in order to be damped. The belt drive 4 is enclosed in a drive housing 11 which limits the available installation space. The belt mechanism 3 connects the first cone pulley pair 34 with the second cone pulley pair 35 in a torque transmitting manner. Here, for example, at a first conical pulley pair 34, which is connected to the transmission input shaft 32 in a torque-transmitting manner in a rotatable manner about a (first) rotational axis 46 on the input side, there is a first (small) effective circle 39, on which the belt mechanism 3 runs, by means of a corresponding spacing in the axial direction 12 (corresponding to the orientation of the rotational axes 46, 47). Here, for example, a second conical wheel pair 35, which is rotatably connected to the transmission output shaft 33 in a torque-transmitting manner about a (second) rotational axis 47 on the output side, is provided with a second (relatively large) effective circle 40, on which the belt mechanism 3 runs, by means of a corresponding distance in the axial direction 12. The (variable) ratio of the two

effective circles

39, 40 gives the gear ratio between the transmission input shaft 32 and the transmission output shaft 33.

The first return section 7 and the second return section 8 (guided here) are shown in an ideal tangential orientation between the two cone pulley pairs 34, 35, so that a parallel orientation (shown and belonging to the first return section 7) of the current direction of entry 13 results. The transverse direction 14 shown here is defined perpendicular to the travel direction 13 and perpendicular to the axial direction 12 as a third spatial axis, wherein this is understood as the coordinate system (associated with the effective circle) moving together. Thus, not only the illustrated travel direction 13 but also the transverse direction 14 applies only to the illustrated vibration damping device 1 (embodied here as a rail) and the first return section 7, more precisely only to the illustrated set effective circle 39 on the input side and the corresponding effective circle 40 on the output side. The damping device 1 embodied as a sliding rail with its outer sliding surface 6 and its reactively oriented inner sliding surface 5 rest against the first return section 7 of the drive belt mechanism 3, so that a sliding channel 41 for damping the vibration of the first return section 7 is formed. In order to allow the sliding

surfaces

5, 6 to follow a variable tangential orientation, i.e. the direction of travel 13, when the

effective circles

39, 40 change, the bearing block 9 is supported on the holding device 10 with the pivot axis 36. Thereby, the vibration damping device 1 is supported in a pivotable manner about the pivot axis 36. In the embodiment shown, the pivoting movement consists of a superposition of pure angular and transverse movements, so that, unlike the movement along a circular path, a movement along an elliptical (steeper) curved path occurs.

In the case of the exemplary illustrated circumferential direction 48 and in the case of a torque input via the transmission input shaft 32, the vibration damping device 1 in the illustration forms an inlet on the left and an outlet on the right. In the embodiment driven as a traction mechanism, the return section 7 to be guided then forms a tensioning return section 7 as a traction return section, and the further return section 8 forms a relaxation return section 8. In the embodiment of the belt mechanism 3 as a metal belt, under otherwise identical conditions, either the return section 7 to be guided as a slack return section 8 is guided by means of the damping device 1, or the return section 7 to be guided is embodied as a tight return section 7, and:

upon input of torque via the first cone pulley pair 34, the wrapping direction 48 and the travelling direction 13 are reversed; or alternatively

The transmission output shaft 33 and the transmission input shaft 32 are exchanged such that the second cone pulley pair 35 forms a torque input.

Fig. 5 shows a drive train 31 in a motor vehicle 49 with a belt drive 4. The motor vehicle 49 has a longitudinal axis 50 and an engine axis 51, wherein the engine axis 51 is arranged in front of a cab 52. The drive train 31 comprises a first drive machine 53, which is preferably embodied as an internal combustion engine 53 and is then connected to the belt drive 4 on the input side in a torque-transmitting manner, for example via an internal combustion engine shaft 54. The second drive motor 55, which is preferably embodied as an electric drive motor 55, is then connected to the belt drive 4 in a torque-transmitting manner, for example, likewise via a rotor shaft 56. Torque for the powertrain 31 is output by means of the drive machines 53, 55 or via their machine shafts 54, 56, simultaneously or at different times. However, it is also possible to absorb torque, for example by means of the internal combustion engine 53 for engine braking and/or by means of the electric drive machine 55 for recuperating braking energy. On the output side, the belt drive 4 is connected to a drive output, which is only schematically shown, so that the left propulsion wheel 57 and the right propulsion wheel 58 can be supplied with torque by the drives 53, 55 in a variable transmission ratio.

By means of the damping device proposed here, a reliable lubrication of the belt drive is achieved while the damping properties are good.

List of reference numerals

1. Vibration damping device

2. Vibration damping system

3. Transmission belt mechanism

4. Belt drive

5. Inner sliding surface

6. Outer sliding surface

7. First return section

8. Second return section

9. Supporting seat

10. Holding device

11. Transmission housing

12. Axial direction

13. Direction of travel

14. Transverse direction

15. Front abutment surface

16. Rear abutment surface

17. First rail half

18. Second track half

19. First bolt

20. Second bolt

21. First free end

22. Second free end

23. First hook

24. Second hook

25. Fastening section

26. Support section

27. Outlet device

28. A first front opening

29. A second front opening

30. Axial center

31. Power assembly

32. Transmission input shaft

33. Output shaft of transmission device

34. First cone pulley pair

35. Second conical wheel pair

36. Pivot axis

37. Movable wheel on output side

38. Fixed wheel on output side

39. Effective circle of input side

40. Effective circle of output side

41. Sliding channel

42. First web plate

43. A second web

44. A first axial sliding surface

45. Second axial sliding surface

46. Axis of rotation on the input side

47. Axis of rotation on the output side

48. Direction of wrapping

49. Motor vehicle

50. Longitudinal axis

51. Engine axis

52. Cockpit (cockpit)

53. Internal combustion engine

54. Internal combustion engine shaft

55. Electric driving machine

56. Rotor shaft

57. Left propulsion wheel

58. Right propulsion wheel

Claims

1. Damping device (1) for a damping system (2) of a drive belt mechanism (3) of a belt drive (4), having at least the following components:

-at least one sliding surface (5, 6) configured for being in damping contact with a return section (7) of the drive belt mechanism (3), and

a bearing block (9) which is arranged pivotably about an axial direction (12) on a holding device (10) of a transmission housing (11) of the belt transmission (4) for orienting the sliding surfaces (5, 6) as a function of the orientation of the return section (7) to be damped, such that the sliding surfaces (5, 6) define a travel direction (13) for the return section (7) to be damped which is perpendicular to the transverse direction (14),

wherein the bearing block (9) comprises a front contact surface (15) and a rear contact surface (16) for contact with the holding device (10),

wherein the damping device (1) has a first rail half (17) and a second rail half (18),

It is characterized in that the method comprises the steps of,

the front abutment surface (15) is comprised only by the first rail half (17) and/or the rear abutment surface (16) is comprised only by the second rail half (18).

2. Damping device (1) according to claim 1, wherein

At least one of the contact surfaces (15, 16) is formed in an overlapping manner with the respective further track half (18, 17) in the axial direction (12).

3. Damping device (1) for a damping system (2) of a drive belt mechanism (3) of a belt drive (4), having at least the following components:

It is characterized in that the method comprises the steps of,

the front abutment surface (15) and/or the rear abutment surface (16) are each formed by a single peg (19, 20).

4. A vibration damping device (1) according to any one of claims 1 to 3, wherein the vibration damping device (1) has a first rail half (17) and a second rail half (18),

wherein a connecting device is provided, by means of which the two rail halves (17, 18) are fixed to each other axially and in the direction of travel (13),

wherein preferably the first rail half (17) and the second rail half (18) are formed identically in construction, particularly preferably identically.

5. Damping device (1) according to any one of the preceding claims, wherein hooks (23, 24) are formed at the free ends (21, 22) of the bearing blocks (9) for loss prevention protection of the damping device (1),

wherein preferably such hooks (23, 24) are provided at each abutment surface (15, 16), and particularly preferably the hooks (23, 24) are formed overlapping in the travel direction (13).

6. A holding device (10) for a damping system (2) of a drive belt mechanism (3) of a belt drive (4), the holding device having at least the following components:

-a fastening section (25) for fixing the holding device (10) in a transmission housing (11);

-a support section (26) having an extension in an axial direction (12); and

an outlet device (27) for outputting a liquid operating medium in a direction transverse to the axial direction (12),

wherein the support section (26) can accommodate a damping device (1) such that the damping device (1) can pivot about the axial direction (12) depending on the orientation of the return section (7) to be damped,

it is characterized in that the method comprises the steps of,

the outlet device (27) comprises at least one opening (28, 29) for outputting a liquid running medium, wherein the opening (28, 29) is arranged outside an axial center (30) between axial extreme positions of the belt mechanism (3) when used in the belt mechanism (4).

7. The holding device (10) according to claim 6, wherein

Comprising a single front opening (28) forward and a single rear opening rearward from the outlet means (27),

wherein the front opening (28) and the rear opening are arranged offset from each other in the axial direction (12).

8. The holding device (10) according to claim 6, wherein

Comprising two front openings (28, 29) forward and/or two rear openings rearward from the outlet means (27).

9. A vibration damping system (2) for a drive belt mechanism (3) of a belt drive (4), the vibration damping system having at least the following components:

-a holding device (10) according to any one of claims 6 to 8, and

damping device (1) according to one of claims 1 to 5,

wherein the damping device (1) is pivotably guided about the axial direction (12) by means of the holding device (10) when used in a belt drive (4).

10. A belt drive (4) for a powertrain (31), the belt drive having at least the following components:

-a transmission input shaft (32) having a first cone pulley pair (34);

-a transmission output shaft (33) with a second cone wheel set (35);

-a drive belt mechanism (3) by means of which the first cone pulley pair (34) is connected in torque-transmitting manner with the second cone pulley pair (35), and

-a vibration damping system (2) according to claim 9, wherein the vibration damping device (1) is abutted against a return section (7) of the drive belt mechanism (3) by means of at least one sliding surface (5, 6) for vibration damping of the drive belt mechanism (3).