Damper device for a wrapping element of a wrapping gear

Abstract

Damper device (1) for a wrapping element (2) of a wrapping gear (3), comprising at least the following components: - at least one sliding surface (4, 5) which is designed to provide damping contact with a section (6) of the wrapping means (2); and - a bearing receptacle (8) which is mounted on a holding device (9) of a gearbox housing (10) of the wrap-around gearbox (3) for aligning the sliding surface (4,5) depending on the orientation of the section (6) to be damped pivotably about an axial direction (11), so that the sliding surface (4,5) defines a running direction (12) for the section (6) to be damped perpendicular to a transverse direction (13), wherein the bearing receptacle (8) comprises a left pedestal leg pair (16) and a right pedestal leg pair (17), wherein the pedestal leg pairs (16,17) each have a first pedestal leg (18,19) and a second pedestal leg (20,21) and a first bearing section (14,15), wherein at least one of the base leg pairs (16,17) has a second bearing section (27,28) which is arranged axially outside to the respective first bearing section (14,15). characterized by the fact that the first pedestal leg (18,19) of the pair of pedestal legs (16,17) has an offset (22,23) in the axial direction (11) to the second pedestal leg (20,21) of the same pair of pedestal legs (16,17).

Description

[0001] The invention relates to a damping device for a wrapping means of a wrapping transmission, a wrapping transmission with such a damping device for a drive train, a drive train with such a wrapping transmission, and a motor vehicle with such a drive train.

[0002] A wrap-around transmission, also known as a conical disc wrap-around transmission or CVT (continuous variable transmission), for a motor vehicle comprises at least one first pair of conical discs arranged on a first shaft and a second pair of conical discs arranged on a second shaft, as well as a wrap-around means provided for torque transmission between the pairs of conical discs. A pair of conical discs comprises two conical discs which are aligned with corresponding conical surfaces facing each other and are axially movable relative to each other.Such a wrap-around drive typically comprises at least a first pair of conical discs and a second pair of conical discs, each with a first conical disc, also called a loose disc or displacement disc, which is movable along the shaft axis, and a second conical disc, also called a fixed disc, which is fixed in the direction of the shaft axis. The wrap-around element provided for torque transmission between the pairs of conical discs runs on a variable effective circle due to a relative axial movement between the loose disc and the fixed disc caused by the conical surfaces. This allows for stepless adjustment of the speed and torque transmission from one pair of conical discs to the other.

[0003] Such wrap-around drives have been known for a long time, for example from DE 100 17 005 A1 or WO 2014 / 012 741 A1. In operation, the wrap-around drive is displaced radially between an inner position (smaller effective circle) and an outer position (larger effective circle) by means of the relative axial movement of the conical discs. The wrap-around drive forms two channels between the two pairs of conical discs, whereby (depending on the configuration and the direction of rotation of the conical disc pairs) one of the channels is a tension channel and the other a thrust channel, or a load channel and an unloaded channel.

[0004] From publication WO 2015 / 043 598 A1, a damping device for a wrapping element of a wrapping gear is known, comprising: - a sliding surface for damping contact with a section of a wrapping device, - a bearing receptacle which is mounted on a holding device of a gearbox housing for aligning the sliding surface depending on the orientation of the section to be damped and is pivotable about an axial direction, wherein the bearing receptacle comprises a left base leg pair and a right base leg pair, wherein the base leg pairs each have a first base leg and a second base leg and a first bearing section, wherein at least one of the base leg pairs has a second bearing section which is arranged axially outside to the respective first bearing section.

[0005] In such wrap-around drives, at least one damping device is provided in the space between the pairs of conical discs. This damping device can be arranged on the tension side and / or the compression side of the wrap and serves to guide and thus limit vibrations of the wrap. Such a damping device must be designed primarily for acoustically efficient guidance of the wrap. The length of the assembly, formed by a sliding surface for guiding the wrap, and the stiffness of the damping device are crucial influencing factors. A damping device can, for example, be designed as a sliding shoe or a sliding guide with a sliding surface on only one side, usually located on the inside (transverse to the wrap) – i.e., between the two sections – due to space constraints.Alternatively, the damping device is designed as a sliding rail with a sliding surface on both sides, i.e., both an outer sliding surface, i.e., outside the formed wrapping circle, and an inner sliding surface to the relevant section of the wrapping element.

[0006] The direction perpendicular to the (respective) phase and pointing from the inside to the outside or vice versa is called the transverse direction. The transverse direction of the first phase is therefore only parallel to the transverse direction of the second phase if the two pairs of conical disks have equal radii of action. The direction perpendicular to both phases and pointing from one conical disk to the other of a pair of conical disks is called the axial direction. This is a direction parallel to the axes of rotation of the pairs of conical disks. The direction in the (ideal) plane of the (respective) phase is called the direction of travel, the counter-rotation direction, or the longitudinal direction. The direction of travel, transverse direction, and axial direction thus define a Cartesian coordinate system that moves with the (operational) operation.Although the aim is for the direction of travel to form the ideal shortest connection between the adjacent working circles of the two pairs of conical disks, in dynamic operation the orientation of the respective section can deviate from this ideal shortest connection in the short term or permanently.

[0007] The damping device is mounted on a support structure with a pivot axis by means of a bearing mount, thus enabling the damping device to pivot about the pivot axis. In some applications, the damping device is also transversely movable, so that it follows a (steeper oval) curve that deviates from a circular path around the pivot axis. The pivot axis thus forms the center of a (two-dimensional) polar coordinate system, where the (pure) pivoting motion corresponds to the change in the polar angle and the transverse motion to the change in the polar radius. This superimposed translational motion, which is overlaid on the pivoting motion, will be disregarded in the following for the sake of clarity and summarized under the term pivoting motion. The pivot axis is oriented perpendicular to the direction of travel of the wrapping element, i.e., axially.This ensures that when the effective circles of the wrapping mechanism are adjusted, the damping device can follow the resulting new (tangential) orientation of the wrapping element.

[0008] The damping device should be easy to install and wear-resistant throughout its entire service life. Firstly, at least one sliding surface must be wear-resistant to achieve the required damping. Secondly, the bearing housing must be wear-resistant to ensure optimal and consistent guiding characteristics of the damping device on the mounting structure.

[0009] It has been shown that the bearing housing, which is subject to a continuous pivoting movement on the holding device during operation (as previously described), exhibits high wear in the longitudinal direction, thus causing the guiding properties of the damper device to steadily decrease over its service life and potentially leading to material fatigue in the area of ​​the bearing housing.

[0010] Based on this, the present invention aims to overcome, at least partially, the disadvantages known from the prior art. The features of the invention are defined in the independent claims, for which advantageous embodiments are shown in the dependent claims. The features of the claims can be combined in any technically meaningful way, whereby the explanations in the following description and features from the figures, which comprise supplementary embodiments of the invention, can also be used.

[0011] The invention relates to a damping device for a wrapping element of a wrapping gear, comprising at least the following components: - at least one sliding surface designed to provide damping contact with a section of a encircling device; and - a bearing receptacle which is mounted on a holding device of a gearbox housing of a wrap-around gearbox for aligning the sliding surface depending on the orientation of the section to be damped, pivotably about an axial direction, so that the sliding surface defines a running direction for the section to be damped perpendicular to a transverse direction, wherein the bearing receptacle comprises a left base leg pair and a right base leg pair, wherein the base leg pairs each have a first base leg and a second base leg and a first bearing section.

[0012] The damper device is characterized primarily by the fact that at least one of the pairs of base legs has a second bearing section, which is arranged axially on the outside of the respective first bearing section.

[0013] In the damper device, the first base leg of each pair of base legs has an axial offset relative to the second base leg of the same pair of base legs.

[0014] It is proposed here that the first leg of each pair of pedestals is offset from the second leg of the same pair by means of an axial offset. This offset is defined from the axially inward-facing surface of the first leg to the (axially aligned) axially inward-facing surface of the second leg.

[0015] The second left base leg is offset axially to the right by a predefined first offset relative to the first left base leg. In the same viewing direction (i.e., either in the direction of travel or the opposite direction), the second right base leg is also offset axially to the right by a predefined second offset relative to the first right base leg. This results in a parallelogram shape (with any identically defined point on the base legs as the vertices). Alternatively, a trapezoidal shape is formed, such that the offset in the two pairs of base legs is not the same or is even opposite to each other. Preferably, the magnitude of each offset is identical. In a preferred embodiment, two structurally identical, preferably identical, rail halves are provided, with a left pair of base legs attached to a left rail half and a right pair of base legs attached to a right rail half (preferably formed in one piece).

[0016] Such an offset is particularly advantageous for applications with a holding device in which a service outlet is arranged axially between the left and right base legs. Preferably, such a service outlet has at least one opening in the direction of travel and one opening in the opposite direction of travel, with the openings preferably being aligned with each other. This provides each base leg with the largest possible bearing surface for the respective axial extreme position relative to the holding device.

[0017] In the following, reference is made to the aforementioned direction of travel (also referred to as the longitudinal direction) when, unless explicitly stated otherwise, the perpendicular transverse and axial directions, which therefore span a Cartesian coordinate system, and corresponding terms are used. When the direction of travel, the axial direction, and the transverse direction are mentioned here, both the positive and negative directions within the spanned coordinate system are meant. Furthermore, reference is made to the wrapping element, which, in the assembled state, forms a circle of wrap around the set circles of action of the two pairs of conical discs of a wrapping mechanism. With regard to the circle of wrap, the terms "inside" (i.e., the wrapping element enclosed in the (imaginary) plane of the circle of wrap) and "outside" are used, respectively.The terms left and right refer to the sides in the direction of travel in a plane parallel to the pivot axis, are arbitrarily chosen (interchangeable) and serve purely to simplify the explanations.

[0018] Unless explicitly stated otherwise, ordinal numbers used in the preceding and following descriptions serve solely for unambiguous differentiation and do not indicate any order or ranking of the components referred to. An ordinal number greater than one does not necessarily imply the presence of another such component.

[0019] The damping device, according to the prior art, is designed to dampen a wrapping element, for example, a link chain or belt, or a wrapping drive with two pairs of conical pulleys. The wrapping element is, for example, designed as a traction element or a push-link belt. This means that the damping device is designed for one of the two sections of the wrapping element, for example, in a configuration as a traction element drive for the tension section, which forms the load section. Alternatively, the slack section or both sections are each guided by such a damping device. When the term "guiding" is used here, it also refers to the damping of the section, because the wrapping element, upon transitioning into the section, is accelerated transversely outwards in a direction that deviates from the ideal tangential direction of the set effective circles of the two conical pulley pairs.This results in wave vibrations, which impair efficiency and lead to noise emissions.

[0020] For guiding or damping, the damping device has at least one sliding surface which rests transversely on the outside of the section to be guided (i.e., damped) and / or transversely on the inside of the section to be damped. The sliding surface thus forms a contact surface extending in the direction of travel, which counteracts the transversely oriented amplitude of the wave vibrations of the section to be damped.

[0021] To enable the damper device to follow the (ideal) direction of travel, which depends on the respective set working circles on the two pairs of conical discs, a bearing housing is provided. This bearing housing is pivotally mounted on an axially aligned pivot axis formed by a holding device, for example, in the manner described above. This allows the damper device to pivot about the axial direction such that the sliding surface defines a direction of travel for the section to be damped perpendicular to a transverse direction. The holding device is, for example, fixedly positioned in the gearbox housing. In one embodiment, the holding device is formed integrally with the gearbox housing. In a preferred embodiment, the holding device is configured such that it includes an inlet channel, for example, for a lubricant for the surrounding element.

[0022] Here, the bearing mount comprises a left and a right pair of base legs, with the left pair of base legs positioned to the left of the center of the encircling element and the right pair of base legs to the right of the center of the encircling element. Thus, the two pairs of base legs are axially spaced apart. Optionally, a service outlet is arranged between the left and right pairs of base legs in the holding device. Each pair of base legs comprises two legs: one leg in front of and one leg behind the holding device in the longitudinal direction during operation.

[0023] In one embodiment, the damper device is guided by the wrapping element, thus limiting the maximum axial movement relative to the holding device to the axial movement of the wrapping element. Alternatively, contact between the damper device and a conical disk is permissible during operation. In another embodiment, at least one of the two pairs of base legs is configured to prevent axial movement of the damper device in the axial direction, in conjunction with an axially acting stop in the wrapping mechanism, preferably an axial stop of the holding device, or to fix the damper device (in conjunction with two axial stops on either side of the bearing receptacle) in a predetermined axial position.

[0024] The pairs of base legs each comprise a first bearing section, wherein, in a preferred embodiment, the respective first bearing section is limited by the axial extent of the respective pair of base legs. Sufficient longitudinal extension is necessary for the desired (i.e., required) mechanical strength of such a base leg. Sufficient longitudinal extension results in a longitudinal overlap with the respective pair of conical disks, such that the axial extension is determined by the (maximally close) relative position between the respective base leg and the conical disk. Each base leg thus has an axial extension complementary to the pair of conical disks or the respective conical disk.

[0025] It is proposed here that each pair of base legs has a second bearing section arranged axially and externally to the respective first bearing section. The respective second bearing section extends axially and externally with a predefined length. In a preferred embodiment, the axial length is maximized according to the available installation space. For example, the maximum axial length of the second bearing sections is determined by the wall of the gearbox housing and / or any axial stop of the holding device, taking into account the necessary relative (axial) travel of the damper device resulting from changes in the gear ratio of the wrap-around gearbox.

[0026] On the axially outer side, the bearing section is located further to the left for a left-hand base leg and further to the right for a right-hand base leg. The axially outer (second) bearing section has a smaller longitudinal extent than the first bearing section because, at least in one of its maximum (axial) positions on the mounting device, the second bearing section is in axial overlap with the respective conical disk. Thus, there is a longitudinal offset between the first and second bearing sections. Assuming the use of the same material, the second bearing section therefore has lower longitudinal stiffness compared to the first bearing section. In a preferred embodiment, the second bearing section is shorter in the transverse direction than the first bearing section and / or shorter than the maximum transverse extent of the base leg.Thus, in this advantageous embodiment, there is a longitudinal offset between the first bearing section or the section of the base leg pair in which the first bearing section is arranged.

[0027] The second bearing section significantly increases the bearing surface in contact with the holding device, thus preventing friction and tilting around the transverse direction (yawing) with a greater lever arm. This results in advantages regarding achievable service life and / or the selection of (e.g., softer) materials.

[0028] In a preferred embodiment, the two second bearing sections are identical. In another embodiment, at least one pair of base legs has a second bearing section, wherein the other pair of base legs is then formed according to the prior art.

[0029] In a further advantageous embodiment of the damper device, it is proposed that the damper 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 secured axially and in the direction of travel to each other, wherein preferably the first rail half and the second rail half are of the same construction, particularly preferably identical.

[0030] The damper device is designed as a single piece or in multiple pieces, preferably in two pieces, wherein (preferably exclusively) a first rail half and a second rail half are provided. In a single-piece embodiment, the two rail halves are formed integrally. In a multi-piece embodiment, the two rail halves are preferably manufactured separately. These two separate rail halves are secured to each other axially and in the direction of travel by means of a connecting device. In a common embodiment, bayonet hooks are provided for this purpose.

[0031] The rail halves of the damper device are preferably each formed in one piece, particularly preferably by injection molding, for example from a polyamide [PA], preferably PA46.

[0032] In a preferred embodiment, two identical rail halves are provided, as is already known in some conventional designs. During assembly, these can be guided axially relative to each other onto the section to be damped, or one rail half is already mounted and the other can be guided axially, with a hook being inserted into a corresponding hook receptacle of the other rail half (due to the identical construction of each rail half). Preferably, the two rail halves are completely identical in construction, so that they can always be manufactured using the same manufacturing process, in the case of injection molding, using a single injection mold. This reduces manufacturing costs and eliminates the risk of confusion during assembly. The at least one sliding surface is composed of partial surfaces of the rail halves.

[0033] In a further advantageous embodiment of the damper device, it is proposed that the first bearing section is arranged continuously adjacent to the respective axially outer second bearing section.

[0034] For example, the first bearing section is connected to the respective axially outward-facing second bearing section. This refers only to the bearing surface of the bearing sections, so that the bearing surface of the bearing housing for the holding device is significantly increased overall with the axially outward-facing bearing sections.

[0035] The transition from the first bearing section to the second bearing section is, for example, located where a longitudinally extending web is arranged. This provides a transition (preferably free of any offset) from the first bearing section (on the outside, i.e., the side facing away from the holding device) to the web and / or a stiffening element extending in the transverse direction.

[0036] In a preferred embodiment, the second bearing section is made of the same material as the first bearing section. In another embodiment, the second bearing sections are manufactured separately from the first bearing sections and are only joined axially to the outside of the first bearing sections during assembly. In a particularly preferred embodiment, the second bearing receptacle is formed integrally with the respective rail half.

[0037] In an advantageous embodiment of the damper device, it is further proposed that at least one of the first base legs and / or at least one of the second base legs forms a locking device, wherein the locking device is arranged in axial overlap with the respective first bearing section.

[0038] Each pair of base legs comprises a first base leg and a second base leg, arranged in the direction of travel in front of and behind, respectively, i.e., paired on both sides, of the holding device. It is proposed that a locking mechanism be provided for each first and second base leg. This locking mechanism, located on at least one base leg of the pair, for example, a projection in the direction of travel (or the opposite direction) on the respective (transverse) end sections of the base legs, exerts a force in the direction of travel (or the opposite direction) when the legs are placed against the holding device. This force is designed to make spontaneous disassembly of the damping device during operation less likely, and preferably to prevent it entirely under the design load.

[0039] The anti-removal device is arranged in axial overlap with the respective first bearing section. In one embodiment, the axial extent of the anti-removal device corresponds to the axial extent of the respective first bearing section. In another embodiment, the base legs are tapered towards their respective end sections, for example, complementary to the inclination of the adjacent surface of the respective conical disk, so that the anti-removal device arranged at the end sections has a smaller axial extent than the respective bearing section. In a preferred embodiment, the bearing sections and the respective anti-removal device have a common axially inner wall, preferably with an orientation to which the axial direction is normal.

[0040] In a further advantageous embodiment of the damper device, it is proposed that the damper device has an inner sliding surface and an outer sliding surface, which are connected to each other by means of at least one web, preferably a first web and a second web. wherein preferably at least one of the second bearing sections is arranged to terminate with the associated web in the axial direction.

[0041] In this embodiment of the damper device as a slide rail, a sliding channel is formed by means of an inner sliding surface and an outer sliding surface oriented antagonistically to the inner sliding surface in the transverse direction. The sliding channel is designed such that the cable section, as it passes through the damper device, is brought into contact with both the inner and outer sliding surfaces, and the respective cable section is damped. The sliding channel is thus guided in the transverse direction, or the slide rail is carried along when the cable section moves transversely due to a change in the gear ratio of the wrap-around mechanism. Alternatively or additionally, a transverse preload is provided.

[0042] The two sliding surfaces are mechanically connected by means of at least one web. In one embodiment, the web has stiffening elements, for example, ribs. In another embodiment, the web is arranged only on one (axial) side of the shaft. For high stiffness, a first web is preferably provided (axially) to the left of the shaft and a second web (axially) to the right, so that a sliding channel enclosing the shaft to be damped is formed. In one embodiment, the web is designed with an axial sliding surface facing the shaft to be damped, so that the shaft is guided axially in the sliding channel, or the sliding rail is carried along when the shaft moves axially due to a change in the transmission ratio of the encircling mechanism. A damper device with only one sliding surface also has such a driving device for axial movement in one embodiment.Alternatively, the damping device, in the case of the sliding rail the sliding channel, is axially fixed and the section to be damped can move axially relative to at least one sliding surface.

[0043] In a preferred embodiment, at least one of the webs, preferably both webs, is axially terminated with its respective second bearing section (e.g., the second left bearing section of the left web). Thus, an axially external transition (free of any offset), preferably a flat surface, is formed between the web and the associated second bearing section. This allows for high stiffness of the web and / or the second bearing section.

[0044] According to another aspect, a wrap-around transmission for a drive train is proposed, comprising at least the following components: - a transmission input shaft with a first pair of conical discs; - a gearbox output shaft with a second pair of conical discs; - a wrapping means by which the first pair of conical discs is connected to the second pair of conical discs in a torque-transmitting manner; and - a damping device according to an embodiment as described above, wherein the damping device for damping the wrapping means bears against a section of the wrapping means with at least one sliding surface.

[0045] The proposed wrap-around transmission allows for the transmission of torque from a transmission input shaft to a transmission output shaft, and vice versa, with the transmission being continuously adjustable, at least within a certain range. A wrap-around transmission is, for example, a so-called CVT with a tension member or a push-link belt. The wrap member is, for example, a multi-link chain. The wrap member is moved in opposite directions on pairs of conical pulleys, from radially inward to radially outward and vice versa, resulting in a different working circle on each pair of pulleys. The ratio of these working circles determines the torque transmission ratio. The two working circles are connected by an upper and a lower run of the wrap member—namely, a load run (also called a tension run or push run) and an unloaded run.

[0046] Ideally, the channels of the wrapping medium between the two effective circles form a tangential alignment. This tangential alignment is superimposed by induced wave oscillations, caused, for example, by the finite division of the wrapping medium and by its premature departure from the effective circle due to the escape acceleration of the wrapping medium.

[0047] The damping device is designed so that at least one sliding surface rests against a corresponding contact surface of the section to be damped, for example, the load section, in such a way that such wave vibrations are suppressed or at least dampened. Furthermore, for certain applications, a transverse guide is provided, i.e., a guide surface on one or both sides in a plane parallel to the formed circle of the wrapping element. With a slide rail featuring an outer and an inner sliding surface, this creates a sliding channel. The section is thus guided in a plane parallel to the sliding surfaces, and the direction of travel of the section lies in this parallel plane. For optimal damping, the sliding surface is designed to fit as closely as possible to the section of the wrapping element. Alternatively, the damping device is axially fixed, and the guided section is movable relative to it (axially).

[0048] In order for the damping device to follow the alignment of the shaft, a pivot bearing is formed by a holding device, on which the damping device sits with its bearing mount and can thus perform the pivoting movement as described above.

[0049] The components of the recirculating gearbox are usually enclosed and / or supported by a gearbox housing. For example, the retaining device (also called a swivel bearing) for the bearing housing is attached to the gearbox housing as a retaining tube and / or movably mounted. The gearbox input shaft and the gearbox output shaft extend into the gearbox housing from the outside and are preferably supported by bearings on the gearbox housing. The conical disc pairs are enclosed by the gearbox housing, and preferably the gearbox housing forms the abutment for the axial actuation of the movable conical discs (loose discs). Furthermore, the gearbox housing preferably provides connections for mounting the recirculating gearbox, for example, for supplying hydraulic fluid. The gearbox housing has a multitude of constraints and must fit into a predetermined installation space.This interaction results in an inner wall that restricts the shape and movement of the components.

[0050] The proposed wrap-around drive unit features one or two damping devices, at least one of which is designed according to the description above. This design significantly enlarges the bearing surface of the damping device for the mounting bracket by means of the bearing sections. This considerably reduces the occurrence of wear over the intended service life of the damping device. In a preferred embodiment, the stiffness of the bearing surface is also increased, thereby improving the positional stability of the damping device. As a result of this increased positional stability, less (safety) clearance is required, allowing for the use of a larger damping device. Consequently, the noise emission of the wrap-around drive unit can be reduced.The damping device used for this purpose can replace a conventional damping device in a wrap-around gearbox with no or only minimal additional design effort and is particularly easy and safe to install.

[0051] According to a further aspect, a drive train is proposed comprising at least one drive machine with one machine shaft, at least one consumer and a wrap-around transmission according to an embodiment as described above. wherein the machine shaft can be connected to the at least one consumer with a continuously variable transmission, preferably via the wrap-around gear, for torque transmission.

[0052] The drivetrain is designed to transmit torque supplied by a drive motor, for example, an internal combustion engine and / or an electric drive motor, and delivered via its machine shaft (e.g., the combustion engine shaft and / or the (electric) rotor shaft), as required, taking into account the necessary speed and torque. One such application is, for example, an electric generator for the provision of electrical energy. To transmit the torque in a targeted manner and / or via a gearbox with different gear ratios, the use of the wrap-around transmission described above is particularly advantageous because a large gear ratio spread can be achieved in a small space, and the drive motor can be operated within a narrow optimal speed range.Conversely, it is also possible to capture inertial energy introduced by, for example, a drive wheel and transfer it to an electric generator for recuperation (i.e., the electrical storage of braking energy) using a recirculating transmission system, with a suitably configured torque transmission train. Furthermore, in a preferred embodiment, a plurality of drive motors are provided, which can be connected in series or parallel, or operated decoupled from one another, and whose torque can be supplied as needed by means of a recirculating transmission system as described above. An application example is a hybrid drive comprising an electric drive motor and an internal combustion engine.

[0053] The proposed drive train comprises a wrap-around transmission with one or two damping devices, at least one of which is designed according to the description above. The bearing sections significantly enlarge the bearing surface of the damping device for the mounting bracket. This considerably reduces the occurrence of wear over the intended service life of the damping device. In a preferred embodiment, the stiffness of the bearing surface is also increased, thereby improving the positional stability of the damping device. As a result of this increased positional stability, less (safety) clearance is required, allowing for the use of a larger damping device. Consequently, the noise emission of the wrap-around transmission can be reduced.The damping device used for this purpose can replace a conventional damping device in a wrap-around gearbox with no or only minimal additional design effort and is particularly easy and safe to install.

[0054] According to another aspect, a motor vehicle is proposed, comprising at least one drive wheel which can be driven by means of a drive train according to an embodiment as described above for the propulsion of the motor vehicle.

[0055] Most modern motor vehicles are front-wheel drive and often position the drive unit, such as an internal combustion engine and / or an electric motor, in front of the driver's cab and transversely to the main direction of travel. The radial installation space is particularly limited in such a configuration, making the use of a compact wrap-around transmission especially advantageous. A similar situation exists in motorized two-wheelers, which, compared to previously known two-wheelers, are required to deliver consistently higher performance within the same installation space. This challenge is further exacerbated by the hybridization of powertrains.

[0056] This problem is exacerbated in small cars according to European classification. The components used in a small car are not significantly smaller than those in larger car classes. Nevertheless, the available installation space is considerably smaller in small cars. A similar problem arises with hybrid vehicles, which incorporate multiple drive motors and clutches in the powertrain, thus reducing the available installation space compared to a non-hybridized vehicle.

[0057] The proposed motor vehicle comprises a drivetrain with a wrap-around transmission, which includes one or two damping devices. At least one of these damping devices is designed according to the description above, and thus the bearing surface of the damping device for the mounting bracket is significantly enlarged by means of the bearing sections. This considerably reduces the occurrence of wear over the intended service life of the damping device. In a preferred embodiment, the stiffness of the bearing surface is also increased, thereby improving the positional stability of the damping device. As a result of the increased positional stability, less (safety) clearance is required, thus allowing the use of a larger damping device. Consequently, the noise emission of the wrap-around transmission can be reduced.The damping device used for this purpose can replace a conventional damping device in a wrap-around gearbox with no or only minimal additional design effort and is particularly easy and safe to install.

[0058] Passenger cars are assigned to a vehicle class based on criteria such as size, price, weight, and performance, although this definition is constantly evolving according to market needs. In the US market, vehicles in the subcompact and microcar classes are classified as subcompact cars according to European standards, while in the UK they correspond to the supermini and city car classes, respectively. Examples of microcars include the Volkswagen up! and the Renault Twingo. Examples of subcompact cars include the Alfa Romeo MiTo, Volkswagen Polo, Ford Ka+, and Renault Clio. Well-known hybrid vehicles include the BMW 330e and the Toyota Yaris Hybrid. Mild hybrids include the Audi A6 50 TFSI e and the BMW X2 xDrive25e.

[0059] The invention described above is explained in detail below against the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is in no way limited by the purely schematic drawings, although it should be noted that the drawings are not dimensionally accurate and are not suitable for defining size relationships. It is illustrated in Fig. 1: a damping device in a rear view; Fig. 2: the damping device according to Fig. 1 in a wrap-around gear in a schematic view; and Fig. 3: a drivetrain in a motor vehicle with a wrap-around transmission.

[0060] In Fig. Figure 1 shows a damper device 1 in a rear view. The axial direction 11 runs horizontally from right to left, the transverse direction 13 runs vertically from bottom to top, and the running direction 12 points into the plane of the image. The damper device 1, optionally formed from two identical rail halves 24 and 25, is pivotally mounted on a retaining device 9, for example, a retaining tube. The pivot axis 41 of the retaining device 9 runs parallel to the axial direction 11 in the illustration. It should be noted that the pivot axis 41 is not coincident with the central axis of the retaining tube of the retaining device 9 in every operating state.

[0061] By means of the two rail halves 24, 25 a sliding channel 44 for a wrapping element 2 is formed (see Fig. 2) formed, wherein the sliding channel 44 has an inner sliding surface 4 and an outer sliding surface 5 arranged antagonistically to it, to which the transverse direction 13 is oriented perpendicular. The inner sliding surface 4 is connected to the outer sliding surface 5 by means of a first web 45 encompassed by the first rail half 24 and a second web 46 encompassed by the second rail half 25. Optionally, the first web 45 and the second web 46 are each provided with an axial sliding surface 47, 48 facing the section 6, 7 to be damped, so that the section 6, 7 is guided axially in the sliding channel 44, or the damping device 1 is carried along when the section 6, 7 moves axially due to a change in the transmission ratio of the wrap-around drive 3. Optionally, the two separate rail halves 24, 25 are secured to each other axially and in the direction of travel 12 by means of a connecting device (not shown here).

[0062] Here, the damper device 1 comprises a bearing receptacle 8, which is pivotably mounted on the holding device 9 for aligning the sliding surfaces 4, 5 depending on the orientation of the section 6 to be damped about the axial direction 11. The bearing receptacle 8 is arranged within (as shown below) the inner sliding surface 4. The bearing receptacle 8 has a left pair of base legs 16 and a right pair of base legs 17, wherein the left pair of base legs 16 in turn comprises a first left base leg 18 and a second left base leg 20, and the right pair of base legs 17 in turn comprises a first right base leg 19 and a second right base leg 21.In this arrangement, the respective first base leg 18,19 is arranged in front of the holding device 9 and the respective second base leg 20,21 is arranged behind the holding device 9, so that the holding device 9 is clamped around by the respective first base leg 18,19 and the associated second base leg 20,21, for example in a U-shape.

[0063] Here, the first left base leg 18 of the first pair of base legs 16 exhibits an axial (first) offset 22 to the right, as shown in the illustration, relative to the second left base leg 20 of the same pair of base legs 16. The offset 22, 23 is dimensioned between the respective axially inner walls of the two base legs 18, 20, 19, 21 of a pair of base legs 16, 17. Purely optionally, the first offset 22 is identical in magnitude to the second offset 23 in the embodiment shown.

[0064] The left pair of base legs 16 has a first left bearing section 14, and the right pair of base legs 17 has a first right bearing section 15, with the two bearing sections 14 and 15 each clamping around the holding device 9. The first left bearing section 14 and the first right bearing section 15 are axially spaced apart, so that a clearance of axial extent is formed between the two bearing sections 14 and 15, for example, for a service outlet (not shown here). Here, the left pair of base legs 16 has a second left bearing section 27 on its axial outer side, and the right pair of base legs 17 has a second right bearing section 28 on its axial outer side. Thus, the bearing surface of the bearing receptacle 8 is significantly increased.In the illustrated embodiment (purely optional), the respective second bearing sections 27, 28 are arranged directly adjacent to (i.e., continuously) the respective first bearing sections 14, 15. The two second bearing sections 27, 28 extend in the axial direction 11 to the outermost axial extent of the first web 45 and the second web 46, respectively, and thus terminate flush with the webs 45, 46.

[0065] Between the first bearing section 14, 15, which here (purely optionally) includes a retaining device 26, and the respective second bearing section 27, 28, a step is formed in the running direction 12. At the same time, a transition free of any step in the axial direction 11 is formed between the first bearing section 14, 15 and the axially outer surface (here in the area of ​​the respective web 45, 46). In operation, the first bearing section 14, 15 overlaps the respective pair of conical discs 32, 33 in the longitudinal direction, and the second bearing section 27, 28 overlaps it in the axial direction 11.

[0066] In Fig. 2 is the damping device 1 according to Fig. Figure 1 shows a schematic view of a wrapping mechanism 3, wherein a section 6 of a wrapping element 2 is guided and thus damped by means of the damping device 1. The wrapping mechanism 3 is housed in a gearbox casing 10, which limits the available installation space. The wrapping element 2 transmits torque to a first pair of conical discs 32 and a second pair of conical discs 33. A first (smaller, here according to the illustrated transmission ratio) effective circle 42 of the wrapping element 2 is located on the first pair of conical discs 32, which here, for example, is rotatably connected to a gearbox input shaft 30 about an input-side (first) axis of rotation 49, transmitting torque. Due to a corresponding spacing in the axial direction 11 (corresponding to the orientation of the axes of rotation 49, 50), a first effective circle 42 of the wrapping element 2 runs on this circle.On the second pair of conical discs 33, which here, for example, is rotatably connected to a transmission output shaft 31 about an output-side (second) axis of rotation 50 in a torque-transmitting manner, a second (correspondingly large) effective circle 43 is located due to a corresponding spacing in the axial direction 11, on which the wrapping element 2 runs. The (variable) ratio of the two effective circles 42, 43 results in the transmission ratio between the transmission input shaft 30 and the transmission output shaft 31.

[0067] Between the two pairs of conical disks 32, 33, the first (here guided) section 6 and the second section 7 are shown in an ideal tangential orientation, resulting in the parallel orientation of the running direction 12 (shown and belonging to the first section 6). The transverse direction 13 shown here is defined as a third spatial axis, perpendicular to the running direction 12 and perpendicular to the axial direction 11, and is to be understood as a coordinate system that moves along with the (circle of action dependent) movement. Therefore, both the running direction 12 and the transverse direction 13 shown apply only to the damper device 1 shown (here designed as a slide rail) and the first section 6, and only with the input-side operating circle 42 and corresponding output-side operating circle 43 shown.The damper device 1, designed as a slide rail, rests with its outer sliding surface 5 and its antagonistically oriented inner sliding surface 4 against the first section 6 of the wrapping element 2 such that a damping sliding channel 44 is formed for the first section 6. To enable the sliding surfaces 4, 5 to follow the changing tangential orientation, i.e., the direction of travel 12, when the effective circles 42, 43 are changed, the bearing receptacle 8 is mounted on a holding device 9 with a pivot axis 41, for example, a bearing bridge or a retaining tube. This allows the damper device 1 to pivot about the pivot axis 41. In the illustrated embodiment, the pivoting movement consists of a superposition of a pure angular movement and a transverse movement, resulting in a movement along an oval (steeper) curve, deviating from a circular path.

[0068] In the exemplary direction of rotation 51 shown, and with torque input via the transmission input shaft 30, the damper device 1 forms the inlet on the left and the outlet on the right in the illustration. In a version designed as a traction drive, the guided section 6 then forms the load section (tension section) and the other section 7 the slack section. In a version of the wrapping element 2 as a push-link belt, under otherwise identical conditions, either the guided section 6 is guided as the slack section by means of the damper device 1, or the guided section 6 is designed as both the load section and the push section, and: - the direction of rotation 51 and the direction of travel 12 are reversed when torque is applied via the first pair of conical discs 32; or - the transmission output shaft 31 and the transmission input shaft 30 are reversed, so that the second pair of conical discs 33 forms the torque input.

[0069] In Fig.Figure 3 shows a drive train 29 in a motor vehicle 40 with a wrap-around transmission 3. The motor vehicle 40 has a longitudinal axis 52 and an engine axle 53, the engine axle 53 being located in front of the driver's cab 54. The drive train 29 comprises a first drive motor 34, which is preferably designed as an internal combustion engine, and is connected to the wrap-around transmission 3 via an input shaft, for example, a combustion engine shaft, transmitting torque. A second drive motor 35, which is preferably designed as an electric drive motor, is also connected to the wrap-around transmission 3 via a rotor shaft, for example, transmitting torque. A torque for the drive train 29 is delivered simultaneously or at different times by means of the drive motors 34, 35 or via their machine shafts 36, 37.However, it can also absorb torque, for example by means of the internal combustion engine for engine braking and / or by means of the electric drive motor for recuperating braking energy. On the output side, the wrap-around transmission 3 is connected to a purely schematically represented output, so that a left drive wheel 38 and a right drive wheel 39 can be supplied with torque from the drive motors 34 and 35 with a variable transmission ratio.

[0070] The damping device proposed here ensures consistent guiding properties of the wrapping element throughout its entire service life, while requiring minimal installation space. Reference symbol list 1 damper device 2 wrapping agents 3 wrap-around gears 4 inner sliding surface 5 outer sliding surface 6 first tower 7 second tower 8 Bearing 9 Holding device 10 Gearbox housings 11 Axial direction 12 Direction of travel 13 Transverse direction 14 first left camp section 15 first right camp section 16 left base leg pair 17 right base leg pair 18 first left base leg 19 first right base leg 20 second left base leg 21 second right base leg 22 first offset 23 second offset 24 first half of the rail 25 second half of rail 26 Loss prevention 27 second left camp section 28 second right camp section 29 Powertrain 30 Gearbox input shaft 31 Transmission output shaft 32 first pair of conical discs 33 second pair of conical discs 34 first drive machine 35 second drive machine 36 first machine shaft 37 second machine shaft 38 left drive wheel 39 right drive wheel 40 motor vehicle 41 Swivel axis 42 input-side effective circle 43 output-side working circle 44 Sliding channel 45 first jetty 46 second jetty 47 first axial sliding surface 48 second axial sliding surface 49 Input-side rotation axis 50 Output-side rotation axis 51 Direction of rotation 52 Longitudinal axis 53 Engine axle 54 Driver's cab

Claims

[1] Damper device (1) for a wrapping means (2) of a wrapping gear (3), comprising at least the following components: - at least one sliding surface (4, 5) which is designed to provide damping contact with a section (6) of the wrapping means (2); and - a bearing receptacle (8) which is mounted on a holding device (9) of a gearbox housing (10) of the wrap-around gearbox (3) for aligning the sliding surface (4,5) depending on the orientation of the section (6) to be damped pivotably about an axial direction (11), so that the sliding surface (4,5) defines a running direction (12) for the section (6) to be damped perpendicular to a transverse direction (13), wherein the bearing receptacle (8) comprises a left pedestal leg pair (16) and a right pedestal leg pair (17), wherein the pedestal leg pairs (16,17) each have a first pedestal leg (18,19) and a second pedestal leg (20,21) and a first bearing section (14,15), wherein at least one of the base leg pairs (16,17) has a second bearing section (27,28) which is arranged axially outside to the respective first bearing section (14,15). characterized by , that the first pedestal leg (18,19) of the pair of pedestal legs (16,17) has an offset (22,23) in the axial direction (11) to the second pedestal leg (20,21) of the same pair of pedestal legs (16,17). [2] Damper device (1) according to claim 1, wherein the damping device (1) has a first rail half (24) and a second rail half (25), wherein a connecting device is provided by means of which the two rail halves (24, 25) are secured axially and in the running direction (12) to each other, wherein preferably the first rail half (24) and the second rail half (25) are of the same construction, particularly preferably identical. [3] Damper device (1) according to claim 1 or claim 2, wherein the first bearing section (14, 15) is arranged continuously adjacent to the respective axially outer second bearing section (27, 28). [4] Damper device (1) according to one of the preceding claims, wherein a locking device (26) is formed by at least one of the first base legs (18,19) and / or at least one of the second base legs (20,21), wherein the locking device (26) is arranged in axial overlap with the respective first bearing section (14,15). [5] Damper device (1) according to one of the preceding claims, wherein the damper device (1) has an inner sliding surface (4) and an outer sliding surface (5) which are connected to each other by means of at least one web (45,46), preferably a first web (45) and a second web (46), wherein preferably at least one of the second bearing sections (27,28) is arranged to terminate in the axial direction (11) with the associated web (45,46). [6] Wrap-around transmission (3) for a drive train (29), comprising at least the following components: - a transmission input shaft (30) with a first pair of conical discs (32); - a transmission output shaft (31) with a second pair of conical discs (33); - a wrapping means (2) by means of which the first pair of conical disks (32) is connected to the second pair of conical disks (33) in a torque-transmitting manner; and - a damping device (1) according to one of the preceding claims, wherein the damping device (1) for damping the wrapping means (2) bears against a section (6) of the wrapping means (2) with at least one sliding surface (4,5). [7] Powertrain (29), comprising at least one drive machine (34, 35) with one machine shaft (36, 37), at least one consumer and a wrap-around gear (3) according to claim 6, wherein the machine shaft (36,37) can be connected to the at least one consumer with a transmission that is preferably continuously variable by means of the wrap-around transmission (3) for torque transmission. [8] Motor vehicle (40) comprising at least one drive wheel (38, 39) which can be driven by means of a drive train (29) according to claim 7 to propel the motor vehicle (40).

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