DE102014217116A1 - Slide rail channel for a belt drive - Google Patents

Abstract

The invention relates to a sliding rail channel for a belt transmission, which has two opposite sliding surfaces made of a plastic for abutment against a belt parallel to the vibration plane of the belt, wherein at least one stiffening receptacle, which is associated with a respective sliding surface, and at least one separate stiffening element are provided, wherein at least a separate stiffening element in the at least one stiffening receptacle can be arranged, wherein a maximum bending stiffness of the stiffening element is aligned transversely to the plane of vibration, so that the associated sliding surface is stiffened. With the sliding rail channel proposed here with a separate stiffening element, it is possible to achieve a stiffening of the slide rail channel with simple means, without having to change the choice of material of the slide rail channel and at the same time occupy only small space.

Description

The invention relates to a sliding rail channel for a belt transmission, and a belt transmission for a motor vehicle, a torque transmission line, in particular for a motor vehicle.

From the state of the art are known Umschlingungsgetriebe with which at least partially a continuous change of the translation (or reduction) is possible. For this purpose, two conical disk pairs are provided, each having two conical disks. The conical disks are each aligned with their conical surface towards each other and displaceable relative to each other along their common axis of rotation, wherein usually one conical disk is axially fixed and the other conical disk is axially displaceable. About a common belt, for example, a transmission chain, the two conical disk pairs are connected to each other to transmit torque. The wrapping means migrates radially outwardly as the conical discs of a cone pulley pair are fed towards each other and inwardly as the conical disc pairs move away from each other. Relative to a first pair of conical disks, a transmission input shaft is rotationally fixed and a transmission output shaft is rotationally fixed relative to a second pair of conical disks connected in a torque-transmitting manner by means of the belt. Depending on the selected distance of the conical disks relative to each other in relation to the selected distance of the other cone pulley pair, a translation is adjustable. Such a belt transmission is for example from the DE 100 17 005 A1 known. In some applications, the belt transmission is combined with a conventional manual transmission with fixed gear ratios, so that a larger transmission spread is achieved with a relatively smaller number of fixed gear ratios.

Due to the nichtconnindungstangentiale, leaving the belt from the formed between the conical disks of a pair of cones wedge, in particular due to the polygonal barrel, which results from the finite pitch of the chain, and other dynamic effects at the inlet and outlet in or out of the wedge wedge) through which Variation of the translation or by rotational irregularities and other vibrations is the Umschlingungsmittelum the Umschlingungsmittelebene vibrated. The wrapper plane (or short: vibration plane) is the shortest tangential connection of the set effective circle of the cone pulley pairs and thus changeable with the change of the translation. The plane of oscillation usually coincides with the median plane in the direction of travel of the respective strand, that is to say the traction (or load) or the empty strand, of the belt. In order to reduce this vibration, sliding rail channels are used in the prior art, which bear a low friction having a large area on the belt or are parallel (narrow) spaced and thus prevent vibration by the mechanical limitation. Such a slide rail channel is for example in the above DE 100 17 005 A1 described.

In the course of reducing the available space and other requirements such as the reductions in mass smaller and smaller, wrap means are required. As a result, the space available for a slide rail channel is reduced, while the requirements for stiffness of the slide rail channel are unchanged or tend to increase due to increasing comfort requirements. When using a (single) low cost material (e.g., a plastic such as polyamide), these conflicting requirements are sometimes unattainable. On this basis, the present invention has the object, at least partially overcome the known from the prior art disadvantages. The features of the invention will become apparent from the independent claims, to which advantageous embodiments are indicated in the dependent claims. The features of the claims may be combined in any technically meaningful manner, for which purpose the explanations of the following description as well as features of the figures may be consulted which comprise additional embodiments of the invention.

The invention relates to a sliding rail channel for a belt transmission, which has two opposite sliding surfaces made of a plastic for engagement with a belt means parallel to the vibration plane of the belt, wherein at least one stiffening receptacle, which is associated with a respective sliding surface, and at least one separate stiffening element are provided, in each case at least one separate stiffening element in the at least one stiffening receptacle can be arranged, wherein a maximum bending stiffness of the stiffening element is aligned transversely to the plane of vibration, so that the associated sliding surface is stiffened.

The slide rail channel is adapted to suppress a vibration of the belt in the direction of the vibration level described in detail or to reduce the vibration amplitude by these Movement direction by concerns or close spacing on the strand in question, usually at least at the Zugtrum, the belt is mechanically limited. For this purpose, the slide rail on a sliding surface made of a plastic, which has a low friction to the belt. The plastic is, for example, a polyamide and the belt is usually made of a metal. The sliding rail channel proposed here has a stiffening receptacle, which is assigned to a (single) sliding surface. The stiffener receptacle is adapted to receive a separate stiffening element. The stiffening element is preferably completely received in the stiffening receptacle. In any case, the stiffening element is not provided with further elements and not arranged in further recordings. A separate stiffening element preferably consists solely of sections which improve the rigidity and facilitate the ability to mount in the stiffening receptacle or secure the stiffening element in the stiffening receptacle. Preferably, the stiffening element in the stiffening receptacle is arranged in each case only on one side, which faces away from the respective associated sliding surface, that is to say from the wrapping means or the vibration plane.

If a stiffening element is introduced into the stiffening receptacle, the associated sliding surface is stiffened. The stiffening receptacle is arranged such that the associated separate stiffening element is firmly connected to the slide rail channel and receives a load, starting from the sliding surface and thus increases the flexural rigidity of the slide rail channel or the associated sliding surface. The stiffening element has a maximum bending stiffness transverse to the plane of vibration, that is, for example, by a large area inertia transverse to the plane of vibration. Preferably, the stiffening element is thus constructed with a narrow width and high height transversely to the vibration plane. For isotropic mechanical properties of a material, for simple rectangular cross-sections a proportional dependence of the bending stiffness on the product of the cube of the height (h: extension transverse to the vibration plane) and the simple width (b: extension parallel to the vibration plane), ie proportional to h ³ × b. For complex geometries, according to Steiner's theorem, a proportional dependence of the bending stiffness on the sum (for all faces) from the twelfth of the formula given above applies for the respective face and out of the product of the second power of the distance in the transverse direction (for example, a ² ) respective partial area to the total area centroid and the partial area (for example, h × b), that is, proportional to ((h ³ × b) / 12 + a ² × h × b). However, other measures such as an anisotropic material property can also be used, such as in fiber-reinforced plastics. However, such properties may also be used in addition to enhancing the geometric effect.

According to a further advantageous embodiment of the slide rail, the at least one stiffening element is made of a metal.

A separate stiffening element made of a metal, for example aluminum, is particularly advantageous, since a high stiffness combined with a relatively low density and at the same time a high degree of elasticity is achieved with a material, so that there is no failure of the stiffening element in case of overload peaks. In addition, a metal component can be produced very well in mass production. In addition, the rigidity is well ensured even at high temperatures during operation by a stiffening element made of a metal, if the plastic has a reduced rigidity.

According to a further advantageous embodiment of the slide rail, the at least one stiffening element is a flat sheet metal element.

A stiffening element of a flat sheet metal element has particularly good properties in terms of cost of manufacture and adaptability to a sliding rail channel and the rigidity and elasticity. A sheet metal element also has the advantage that an (anisotropic) stiffened preferred direction is present through the manufacturing process of sheet material, which thus allows an optimized use as a stiffening element. The flat sheet metal element does not have to form a smooth plane as a stiffening element, but is, for example, corrugated, jagged or shaped in any other way. Particularly preferably, the flat sheet metal element is used without further deformation in the plane transverse to the plane of vibration and is thus particularly space-saving use and low in production. Particularly preferably, any sections present at an angle to the main extension (transverse to the vibration plane) have a width parallel to the vibration plane of less than half, preferably less than 10%, of the height of the main extension, and further preferably not more than ten times the plate thickness, preferably less than five times the sheet thickness. Most preferably, any angled portions are not directly involved in the stiffening of the respective sliding surface, but, for example, set up for the attachment of the stiffening element. Particularly preferably, a flat sheet metal element is designed with a uniform sheet thickness.

According to a further advantageous embodiment of the sliding rail channel that is at least a stiffening element in the at least one stiffening receptacle of the slide rail channel arranged contactless to the belt, wherein in the installation in a belt transmission preferably only the sliding surfaces are in contact with the belt means.

In this preferred embodiment, a contact between the stiffening element and the belt means is not possible because the stiffening receptacle of the slide rail channel is arranged such that the stiffening element is spaced from the belt means. Very particularly preferably, therefore, only the sliding surface of the slide rail channel is brought into contact with the belt, which has a particularly low friction with the belt. In this case, the separate stiffening element can be inserted or attached laterally to the slide rail channel. Most preferably, the separate stiffening element is sufficiently secured solely by insertion or insertion with the slide rail. According to an alternative embodiment, the stiffening element is already cast in the plastic injection molding.

According to a further advantageous embodiment of the slide rail channel, at least one sliding surface has a contact lip which, preferably over the entire length of the corresponding stiffening element, bears against the corresponding stiffening element and is elastically and / or plastically deformed by means of the corresponding stiffening element.

The contact lip is formed integrally with at least a part of the contact surface of the associated sliding surface. It represents in this preferred embodiment, a bridge between the separate stiffening element and the sliding surface to the belt means. Here, the contact lip is elastically and / or plastically deformed by the attachment of the separate stiffening element, and preferably transferred to a desired position for operation as a damping means. As a result, a close power transmission contact is ensured to the stiffening element and the contact lip is designed particularly thin, so that the rigidity of the separate stiffening element comes particularly good effect. The thickness of the contact lip is interpreted in accordance with the wear of the sliding surface and / or a desired damping effect by the selected plastic. The contact lip is designed, for example, continuous or interrupted.

• – zumindest eine Getriebeeingangswelle mit einem ersten Kegelscheibenpaar;
• – zumindest eine Getriebeausgangswelle mit einem zweiten Kegelscheibenpaar;
• – zumindest ein Umschlingungsmittel, welches das erste Kegelscheibenpaar mit dem zweiten Kegelscheibenpaar drehmomentübertragend verbindet;
• – zumindest einen Gleitschienenkanal gemäß einer Ausführungsform der obigen Beschreibung zum Dämpfen des zumindest einen Umschlingungsmittels.

According to a further aspect of the invention, a belt transmission for a torque transmission train is proposed, which comprises at least the following components:

• - At least one transmission input shaft with a first cone pulley pair;
• - At least one transmission output shaft with a second cone pulley pair;
• - At least one Umschlingungsmittel, which connects the first conical disk pair with the second conical disk pair to transmit torque;
• At least one slide rail channel according to an embodiment of the above description for damping the at least one wrapping means.

With the belt transmission proposed here, a torque can be translated or reduced, wherein the transmission is at least partially infinitely adjustable. The translation is set via the two cone pulley pairs as described above. The belt is arranged between the respective relatively movable conical pulley pairs and transmits a torque from a cone pulley pair on the other cone pulley pair. Preferably, the belt is held at a constant length. At the same time, the slide rail channel can be designed to be particularly narrow at a low height because an improved bending stiffness can be achieved by means of the separate stiffening element of identical size. Most preferably, the slide rail is adaptable to an individual adaptation of the required torque, which is to be transmitted by a stiffening element is provided, or a stiffening element is designed accordingly, without the sliding rail with its sliding surface and the stiffening receptacle (consuming) to be changed got to.

According to a further aspect of the invention, a torque transmission train is proposed, which has a drive unit with an output shaft, a drive train and a belt transmission as described above, wherein the output shaft for torque transmission by means of the belt drive with the drive train with variable transmission is connectable.

The torque transmission train is configured to transfer a torque provided by a drive unit, for example an energy conversion engine, and output via its output shaft, for example an internal combustion engine or an electric motor, as needed, thus taking into account the required rotational speed and the required torque. The use is, for example, at least one drive wheel of a motor vehicle and / or an electric generator for Provision of electrical energy. In order to selectively transmit the torque and / or by means of a gearbox with different ratios, the use of the belt-type transmission described above is particularly advantageous because a large transmission spread can be achieved in a small space. Conversely, a recording of a, for example, a drive wheel introduced inertial energy, which then forms a drive unit, by means of the belt drive on an electric generator for recuperation, ie the electrical storage of braking energy, implemented with a suitably equipped torque transmission line. Furthermore, in a preferred embodiment, a plurality of drive units are provided which are connected in series or in parallel or can be operated decoupled from one another, or whose torque can be made available for use as needed. Examples are hybrid drives of electric motor and internal combustion engine, but also multi-cylinder engines in which individual cylinders (groups) are switchable.

According to a further aspect of the invention, a motor vehicle is proposed, which has at least one drive wheel which can be driven by means of a torque transmission line as described above.

Most motor vehicles today have a front-wheel drive and sometimes arrange the drive unit, for example an internal combustion engine or an electric motor, in front of the driver's cab and along the main direction of travel. The radial space is particularly small in such an arrangement and it is therefore particularly advantageous to use belt drive small size. Similarly, the use of a belt transmission designed in motorized two-wheelers, for which a significantly increased performance is required with the same space.

This problem is exacerbated in passenger cars of the small car class according to European classification. The units used in a passenger car of the small car class are not significantly reduced compared to passenger cars larger car classes. Nevertheless, the available space for small cars is much smaller. The torque transmission train described above has a belt transmission of particularly small size, wherein the belt is particularly narrow executable. With the sliding rail channel proposed here damping of the narrow belt is possible with a correspondingly narrower construction of plastic alone with an additional stiffening element, at the same time the radial space requirement can be kept low, because the stiffness of the slide rail channel by means of the additional stiffening element even at a low altitude, the Thus, extending radially with respect to the longitudinal axis is sufficiently high. Moreover, when using a sliding rail with a low height, a higher spread can be achieved with the same radial space requirement, because it allows the use of conical disk pairs with a larger diameter. The spread depends on the minimum transmission diameter (running radius) and the maximum transmission diameter of the cone pulley pairs.

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

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

1 a sliding rail channel with a separate stiffening element;

2 : a belt drive with sliding rail channel; and

3 : a torque transmission train in a motor vehicle.

In 1 is a slide rail channel 1 shown in which a first sliding surface 3 and a second sliding surface 4 , which is concealed here by the representation, parallel to a vibration plane 8th aligned to a vibration amplitude around the vibration plane 8th to reduce. In a stiffening picture 6 Here is a separate stiffening element 7 arranged, this of the sliding surface plane of the first sliding surface 3 through a contact lip 9 spaced, wherein the separate stiffening element 7 in force-transmitting contact with the contact lip 9 stands. The separate stiffener 7 is here designed as a sheet metal element, which by clicking into the stiffening recording 6 on the slide rail channel 1 is fastened. In this embodiment, a substantially identical embodiment is also for the second sliding surface 4 intended. Also possible is a stiffening on corresponding fasteners in the stiffening receptacle 6 ,

In 2 is an example of a schematic diagram of a belt transmission 2 shown in which a first cone pulley pair 12 and second cone pulley pair 14 is provided, which with the transmission input shaft 11 or with the transmission output shaft 13 are secured against rotation. By changing the distance of the cone pulley pairs 12 . 14 becomes the gear ratio between the transmission input shaft 11 and the transmission output shaft 13 changed. For this purpose is a belt 5 provided, which here as a chain 24 with a train 26 , pictured above, and an empty section 27 , shown below, is executed. The train 26 is here by means of a slide rail channel 1 in its vibration around the vibration plane 8th attenuated. The slide rail channel 1 forms a chain channel for this purpose 25 out, which in this view down through the first sliding surface 3 and above through the second sliding surface 4 is limited. For adjusting the alignment of the slide rail channel 1 to the transmission ratio between the transmission input shaft 11 and the transmission output shaft 13 or the radius of wrap on the first cone pulley pair 12 and on the second cone pulley pair 14 is the slide rail channel 1 by means of its holder holder 29 on a bracket 28 kept movable.

In 3 is a torque transmission train 10 comprising a drive unit 15 , shown here as an internal combustion engine, an output shaft 16 a belt drive 2 and one by means of a drive train 17 torque transmitting connected left drive wheel 19 and right drive wheel 20 , shown schematically. The torque transmission line 10 is a motor vehicle 18 arranged, wherein the drive unit 15 with its motor axis 23 parallel to the longitudinal axis 22 in front of the driver's cab 21 is arranged.

With the sliding rail channel proposed here with a separate stiffening element, it is possible to achieve a stiffening of the slide rail channel with simple means, without having to change the choice of material of the slide rail channel and at the same time occupy only small space.

LIST OF REFERENCE NUMBERS

1

 Gleitschienenkanal

2

 wrap-around

3

 first sliding surface

4

 second sliding surface

5

 endless

6

 stiffening recording

7

 separate stiffening element

8th

 vibration level

9

 contact lip

10

 A torque coupling

11

 Transmission input shaft

12

 first conical disk pair

13

 Transmission output shaft

14

 second cone pulley pair

15

 drive unit

16

 output shaft

17

 powertrain

18

 motor vehicle

19

 left drive wheel

20

 right drive wheel

21

 cab

22

 longitudinal axis

23

 motor axis

24

 Chain

25

 chain channel

26

 drive span

27

 loose side

28

 bracket

29

 bracket jig

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10017005 A1 [0002, 0003]

Claims (8)

Slide rail channel ( 1 ) for a belt transmission ( 2 ), comprising two opposing sliding surfaces ( 3 . 4 ) made of a plastic for attachment to a belt ( 5 ) parallel to the vibration plane ( 8th ) of the belt ( 5 ), wherein at least one stiffening receptacle ( 6 ), each of which has a sliding surface ( 3 . 4 ), and at least one separate stiffening element ( 7 ) are provided, wherein in each case at least one separate stiffening element ( 7 ) in the at least one stiffening receptacle ( 6 ) is arranged, wherein a maximum bending stiffness of the stiffening element ( 7 ) across the plane of oscillation ( 8th ), so that the associated sliding surface ( 3 . 4 ) is stiffened. Slide rail channel ( 1 ) according to claim 1, wherein the at least one stiffening element ( 7 ) is made of a metal. Slide rail channel ( 1 ) according to claim 2, wherein the at least one stiffening element ( 7 ) is a flat sheet metal element. Slide rail channel ( 1 ) according to one of the preceding claims, wherein the at least one stiffening element ( 7 ) contactless to the belt ( 5 ) in the at least one stiffening receptacle ( 6 ) of the sliding rail channel ( 1 ) is arranged, wherein the installation in a belt transmission ( 2 ) prefers only the sliding surfaces ( 3 . 4 ) with the belt ( 5 ) are brought into contact. Slide rail channel ( 1 ) according to claim 4, wherein at least one sliding surface ( 3 ) a contact lip ( 9 ), which, preferably over the entire length of the corresponding stiffening element ( 7 ), on the corresponding stiffening element ( 7 ) and by means of the corresponding stiffening element ( 7 ) is elastically and / or plastically deformed. Belt transmission ( 2 ) for a torque transmission line ( 10 ), comprising at least the following components: - at least one transmission input shaft ( 11 ) with a first cone pulley pair ( 12 ); At least one transmission output shaft ( 13 ) with a second cone pulley pair ( 14 ); At least one wrapping means ( 5 ), which the first cone pulley pair ( 12 ) with the second cone pulley pair ( 14 ) connects torque transmitting; At least one slide rail channel ( 1 ) according to one of the preceding claims for damping the at least one belt ( 5 ). Torque transmission line ( 10 ), comprising a drive unit ( 15 ) with an output shaft ( 16 ), a powertrain ( 17 ) and a belt transmission ( 2 ) according to claim 6, wherein the output shaft ( 16 ) for torque transmission by means of the belt drive ( 2 ) with the drive train ( 17 ) is connectable with variable translation. Motor vehicle ( 18 ) comprising at least one drive wheel ( 19 . 20 ), which by means of a torque transmission line ( 10 ) is drivable according to claim 7.

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