SLIDE RAIL FOR A BELT-DRIVE TRANSMISSION

Abstract

A slide rail for a belt-drive transmission includes a slide channel and a pivoting receptacle. The slide channel includes a first slide surface for damping contact on a strand of a belt of the belt-drive transmission, a second slide surface for damping contact on the strand, antagonistic to the first slide surface, and a channel height formed by the first slide surface and the second slide surface. The pivoting receptacle is arranged for pivoting support of the slide rail on a pivoting means of the belt-drive transmission. A one of the first slide surface or the second slide surface includes an elevation extending toward the belt such that the one of the first slide surface or the second slide surface is displaced over a profile along a longitudinal direction in a transversal direction.

Claims

1.-8. (canceled)

9. A slide rail for a belt-drive transmission, comprising: a slide channel comprising: a first slide surface for damping contact on a strand of a belt of the belt-drive transmission; a second slide surface for damping contact on the strand, antagonistic to the first slide surface; and a channel height formed by the first slide surface and the second slide surface; and a pivoting receptacle arranged for pivoting support of the slide rail on a pivoting means of the belt-drive transmission, wherein a one of the first slide surface or the second slide surface comprises an elevation extending toward the belt such that the one of the first slide surface or the second slide surface is displaced over a profile along a longitudinal direction in a transversal direction.

10. The slide rail of claim 9 further comprising a material recess formed on a rear side of the first slide surface or the second slide surface.

11. The slide rail of claim 10 wherein the material recess is formed in a region of a reduced channel height or of the elevation, projecting in the transversal direction towards the belt.

12. The slide rail of claim 9 further comprising: a central region having a first channel height; and an edge region comprising a second channel height.

13. The slide rail of claim 12 wherein the first channel height is higher or lower than the second channel height.

14. The slide rail of claim 9, wherein the first slide surface is flat and the second slide surface is curved.

15. The slide rail of claim 9, wherein the first slide surface and the second slide surface are designed to run parallel to one another.

16. A belt-drive transmission for a drive train, comprising: a transmission input shaft comprising a first cone pulley pair; a transmission output shaft comprising a second cone pulley pair; the belt connecting the first cone pulley pair to the second cone pulley pair in a torque-transmitting manner, the belt forming two strands between the first cone pulley pair and the second cone pulley pair; and the slide rail of claim 9, wherein the first slide surface or the second slide surface rests on a one of the two strands.

17. A drive train comprising: the belt-drive transmission of claim 16; a consumer; and a drive assembly comprising a drive shaft connectable to the consumer for torque transmission with a changeable transmission ratio by the belt-drive transmission.

18. A motor vehicle comprising a drive wheel drivable by the drive train of claim 17.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above disclosure is explained in detail below based on the relevant technical background with reference to the associated drawings, which show example embodiments. The disclosure is in no way restricted by the purely schematic drawings, and it should be noted that the drawings are not dimensionally accurate and are not suitable for defining proportions. In the figures,

[0051] FIG. 1 schematically represents a slide rail with an undulating slide channel;

[0052] FIG. 2 schematically represents a slide rail with a curved slide channel;

[0053] FIG. 3 schematically represents a slide rail with a curved slide surface on one side;

[0054] FIG. 4 schematically represents a slide rail with material recesses;

[0055] FIG. 5 represents a belt-drive transmission with a strand guided by a slide rail; and

[0056] FIG. 6 represents a drive train in a motor vehicle with a belt-drive transmission.

DETAILED DESCRIPTION

[0057] FIG. 1 shows a schematic view of a slide 1 from the side, so that in the illustration in the plane of the sheet, the longitudinal direction 1I extends horizontally and the transversal direction 16 extends vertically, and the axial direction 35 extends vertically into (or out of) the plane of the page. The running direction of the strand 26 to be guided or to be damped of the belt 8 (see FIG. 5) corresponds to the illustrated arrow direction of the longitudinal direction 11 and thus defines the profile 15 through the slide channel 3, which is formed by the first slide surface 6 and the second slide surface 7 (connected by means of a web 36) of the slide rail 1, which is aligned antagonistically thereto. A pivoting receptacle 9 enables the slide channel 3 to be aligned (see FIG. 5).

[0058] In the embodiment shown, a (first) elevation 12 and a (third) elevation 14 are provided in the first slide surface 6 and a (second) elevation 13 is also provided in the second slide surface 7. These elevations 12, 13, 14 form the only contact surfaces of the slide surfaces 6, 7, at least at room temperature and/or with an ideally tangential strand 26 (see FIG. 5). As a result of the small extent of the total contact surface, excessive clamping during the cold start is reliably prevented. In an operating state, however, further regions of the slide surfaces 6, 7 also act as contact surfaces. Alternatively, an undulating profile 15 is imposed on the strand 26 to be guided of the belt 8 (see FIG. 5). For example, the (first) channel height 4 is constant over the entire longitudinal extent of the slide channel 3 and thus the geometry of the slide channel 3 is (purely) undulating.

[0059] FIG. 2 shows a further embodiment of a slide rail 1 which, for the sake of clarity, is shown in a manner similar to the embodiment according to FIG. 1. In this respect, reference is also made to the above description. Here the (first) channel height 4 of the slide channel 3 is constant and the (first) channel height 4 is only transversely displaced, specifically here such that the slide channel 3 has a curved geometry.

[0060] FIG. 3 shows a further embodiment of a slide rail 1 which, for the sake of clarity, is shown in a manner similar to the embodiments according to FIG. 1 and FIG. 2. In this respect, reference is also made to the above description. Here, the second (here outer) slide surface 7 is designed to be curved, for example, like the second slide surface 7 as shown in FIG. 2. The first (here inner) slide surface 6, on the other hand, is designed to be flat. The displacement of the (first) channel height 4 is thus superimposed by an expansion with the maximum of the resulting (second) channel height 5 in the center of the slide channel 3, i.e., at the web 36.

[0061] FIG. 4 shows a further embodiment of a slide rail 1 which, for the sake of clarity, is shown in a manner similar to the embodiments according to FIG. 1, FIG. 2 and FIG. 3. In this respect, reference is also made to the above description. A displacement of the (first) channel height 4, for example with a parallel first slide surface 6 and second slide surface 7, is shown here, for example as shown in FIG. 1. Here (optionally) each of the elevations 12, 13 and 14 is provided with a material recess 17, so that a small wall thickness is produced in the region of the elevations 12, 13 and 14, which can be formed by the strand 26 to be guided of the belt 8 (see FIG. 5). The geometry of the slide channel 3 is thus changed as a function of the (force) action of the strand 26 to be guided.

[0062] FIG. 5 schematically shows a slide rail 1 in a belt-drive transmission 2, wherein a first side 26 of a belt 8 is guided by means of the slide rail 1 and is thus damped. The belt 8 connects a first cone pulley pair 23 to a second cone pulley pair 25 in a torque-transmitting manner. A first radius of action 43, on which the belt 8 runs, rests on the first (here input-side) cone pulley pair 23 through a corresponding spacing in the axial direction 35 (corresponding to the orientation of the rotation axes 40, 41), which here for example is rotatably connected in a torque-transmitting manner with a transmission input shaft 22 around an input-side axis of rotation 40. A second radius of action 44, on which the belt 8 runs, rests on the second (here output-side) cone pulley pair 25 through a corresponding spacing in the axial direction 35, which here for example is rotatably connected in a torque-transmitting manner with a transmission output shaft 24 around an output-side axis of rotation 41. The (changeable) ratio of the two radii of action 43, 44 results in the transmission ratio between the transmission input shaft 22 and the transmission output shaft 24.

[0063] Between the two cone pulley pairs 23, 25, the first strand 26 (shown here) and the second strand 34 are shown in an ideal tangential orientation, so that the parallel direction of the longitudinal direction 11 is established. The transversal direction 16 shown here is defined as the third spatial axis perpendicular to the longitudinal direction 11 and perpendicular to the axial direction 35, wherein this is understood as a (radius of action-dependent) coordinate system moving along therewith. Therefore, both the longitudinal direction 11 shown and the transversal direction 16 apply only to the slide rail 1 shown and the first strand 26, and only in the case of the set input-side radius of action 43 and corresponding output-side radius of action 44 shown.

[0064] The slide rail 1 rests with its first (here transversely inner) slide surface 6 and its second (here transversely outer) slide surface 7 connected to it by means of the web 36 on the first strand 26 of the belt 8. So that the slide surfaces 6, 7 can follow the variable tangential orientation, i.e., the longitudinal direction 11, when the radii of action 43, 44 change, the pivoting receptacle 9 is mounted on a pivoting means 10 with a pivot axis 45, for example a conventional holding tube. As a result, the slide rail 1 is mounted pivotably about the pivot axis 45. In the exemplary embodiment shown, the pivot movement is composed of a superposition of a pure angular movement and a transverse movement along a transversal axis 46, so that in deviation from a movement along a circular path, a movement along an oval (steeper) curved path occurs.

[0065] In the direction of rotation 42 shown by way of example, and when the torque is input via the transmission input shaft 22, the slide rail 1 in the illustration forms the inlet side on the left and the outlet side on the right. When running as a traction mechanism drive, the first strand 26 then forms the load strand 26 as the driving strand and the second strand 34 forms the empty strand 34. The travel direction 31 corresponds to the illustrated arrow direction of the longitudinal direction 11. If the belt 8 is designed as a thrust link belt, under otherwise identical conditions, either the first strand 26 is guided as an empty strand by means of the slide rail 1 or the first strand 26 is designed as a load strand and a slack strand and:

the direction of rotation 42 and the travel direction 31 are reversed when torque is input via the first cone pulley pair 23; or
the transmission output shaft 24 and the transmission input shaft 22 are interchanged so that the second cone pulley pair 25 forms the torque input.

[0066] FIG. 6 shows a drive train 21 arranged in a motor vehicle 33 with the motor axis 39 thereof (optionally) transverse to the longitudinal axis 38 (optionally) in front of the driver's cab 37. The belt-drive transmission 2 is connected on the input side to the electric drive shaft 30 of the electric machine 28 and to the combustion engine drive shaft 29 of the internal combustion engine 27. From these drive units 27, 28 or via their drive shafts 29, 30, a torque for the drive train 21 is delivered simultaneously or at different times. However, a torque can also be received by at least one of the drive units 27, 28, for example by means of the internal combustion engine 27 for engine braking and/or by means of the electric machine 28 for recuperation of braking energy. On the output side, the belt-drive transmission 2 is connected to a purely schematically illustrated output, so that here a left drive wheel 31 (consumer) and a right drive wheel 32 (consumer) can be supplied with torque by the drive assemblies 27, 28 with a variable transmission ratio.

[0067] The slide rail proposed here provides efficient damping over a wide operating range while simultaneously preventing excessive clamping.

REFERENCE NUMERALS

[0068] 1 Slide rail [0069] 2 Belt-drive transmission [0070] 3 Slide channel [0071] 4 First channel height [0072] 5 Second channel height [0073] 6 First slide surface [0074] 7 Second side surface [0075] 8 Belt [0076] 9 Pivoting receptacle [0077] 10 Pivoting means [0078] 11 Longitudinal direction [0079] 12 First elevation [0080] 13 Second elevation [0081] 14 Third elevation [0082] 15 Profile [0083] 16 Transversal direction [0084] 17 Material recess [0085] 18 First edge region [0086] 19 Second edge region [0087] 20 Central region [0088] 21 Drive train [0089] 22 Transmission input shaft [0090] 23 First cone pulley pair [0091] 24 Transmission output shaft [0092] 25 Second cone pulley pair [0093] 26 Load strand [0094] 27 Internal combustion engine [0095] 28 Electric machine [0096] 29 Combustion drive shaft [0097] 30 Electric drive shaft [0098] 31 Left drive wheel [0099] 32 Right drive wheel [0100] 33 Motor vehicle [0101] 34 Empty strand [0102] 35 Axial direction [0103] 36 Web [0104] 37 Drivers cab [0105] 38 Longitudinal axis [0106] 39 Motor axis [0107] 40 Input-side axis of rotation [0108] 41 Output-side axis of rotation [0109] 42 Direction of rotation [0110] 43 Input-side radius of action [0111] 44 Output-side radius of action [0112] 45 Pivot axis [0113] 46 Transversal axis