Damper device for a wrap-around means of a wrap-around transmission

Abstract

A damper device for a wrap-around means of a wrap-around transmission includes a carrier body formed from a composite reinforced plastic and comprising a surface, a sliding surface forming a first part of the surface, and a bearing surface for a pivoting means, the bearing surface forming a second part of the surface. The sliding surface or the bearing surface may be formed from a separate layer free of composite reinforcing means. The separate layer may be produced as a step of a multi component injection molding method with the carrier body being produced in a common injection mold in another step, as a coating on the carrier body, or as a separate component mechanically connected to the carrier body.

Claims

1.-10. (canceled)

11. A damper device for a wrap-around means of a wrap-around transmission, comprising: a carrier body formed from a composite reinforced plastic and comprising a surface; a sliding surface forming a first part of the surface; and a bearing surface for a pivoting means, the bearing surface forming a second part of the surface.

12. The damper device of claim 11 wherein: the sliding surface is formed from a separate layer free of composite reinforcing means; or the bearing surface is formed from a separate layer free of composite reinforcing means.

13. The damper device of claim 12 wherein the separate layer is produced: as a step of a multi component injection molding method, the carrier body being produced in a common injection mold in another step; as a coating on the carrier body; or as a separate component mechanically connected to the carrier body.

14. The damper device of claim 12 wherein the separate layer is formed from a low-friction material.

15. The damper device of claim 12 wherein the separate layer is formed from a preferably self-lubricating material.

16. The damper device of claim 12 wherein the separate layer has a thickness greater than a calculated abrasive wear during a predetermined service life of the damper device.

17. The damper device of claim 11 wherein the composite reinforced plastic comprises a short-fiber material, a long-fiber material, or a ball material.

18. The damper device of claim 17 wherein the composite reinforced plastic comprises the short-fiber material with a composite reinforced granular material made of a thermoplastic material for an injection molding process.

19. The damper device of claim 17 wherein the composite reinforced plastic comprises the long-fiber material with a composite reinforced prepreg made of a thermosetting plastic for a thermal molding process.

20. The damper device of claim 11 wherein, in a predetermined region of the carrier body comprising a small number of main load directions, the composite reinforced plastic comprises a long fiber or a mesh-free fiber mat aligned with the small number of main load directions.

21. The damper device of claim 20 wherein the predetermined region comprises a unidirectional or a bidirectional main load direction.

22. An method for producing the damper device of claim 20, comprising: providing an injection mold; inserting the long fiber or the mesh-free fiber mat into the injection mold in the predetermined region; injecting a plastic; and demolding the damper device.

23. The method of claim 22 wherein injecting the plastic comprises a multi component injection molding method wherein: the sliding surface or the bearing surface is injected from a granular material free of composite reinforcing means; and the carrier body is injected from a composite reinforced granular material.

24. A method for manufacturing the damper device of claim 12, comprising: forming the carrier body with long fibers or mesh-free fiber mats in predetermined regions aligned with a main load direction; and applying the separate layer.

25. The method of claim 24 wherein the separate layer is applied by dip coating.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0097] The disclosure described above 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, while it should be noted that the drawings are not dimensionally accurate and are not suitable for defining proportions. In the figures,

[0098] FIG. 1 shows a perspective view of one half of a damper apparatus;

[0099] FIG. 2 shows a perspective view of a carrier body;

[0100] FIG. 3 shows a perspective view of one half of a damper apparatus with a coating;

[0101] FIG. 4 shows a wrap-around transmission with a strand guided by a slide rail; and

[0102] FIG. 5 shows a drive train in a motor vehicle with a wrap-around transmission.

DETAILED DESCRIPTION

[0103] In FIG. 1, (one half of) a damper apparatus 1 is shown in a perspective view. The second half may be formed to be identical to that shown. Correspondingly, in terms of volume, the main portion is formed by the first carrier body 8 (the first half) or the second carrier body 9 (the second half). The damper apparatus 1 shown is designed here as a slide rail with an inner sliding surface 4 and an outer sliding surface 5. A Cartesian coordinate system (moved along therewith) is shown in the travel direction 36 behind the damper apparatus 1, that is to say at the outlet side 40. The transverse direction 37 is perpendicular and the axial direction 38 is oriented transversely in the illustration. The inlet side 39 is shown opposite in the travel direction.

[0104] At the bottom of the illustration, i.e., transversely inside, can be seen (one half of) a pivoting means receptacle having the bearing surface 6, the function of which becomes clear in connection with FIG. 4. The bearing surface 6 is divided into a pivoting partial bearing surface 52 radial to a pivoting means 7 (see FIG. 4) and an axial partial bearing surface 53 axial to an axial bearing surface, for example an axial flange of a pivoting means 7.

[0105] The two sliding surfaces 4 and 5 are each composed of a proportion of both halves of the damper device 1. The two sliding surfaces 4 and 5 are kept mechanically transversely spaced from one another by means of the transverse web 10. The inner sliding surface 4 is formed by a first separate layer 11 and the outer sliding surface 5 is formed by a second separate layer 12. The bearing surface 6 is formed by a third separate layer 13.

[0106] The first separate layer 11 is designed with a first thickness 14 in the middle part thereof, i.e., outside an inlet and an outlet, and the second separate layer 12 is likewise designed with a second thickness 15 in the middle part thereof, i.e., outside an inlet and an outlet. Furthermore, the bearing surface 6 is designed with a third thickness 16 at least in the region of the main load, which is displayed pars pro toto on the axial partial bearing surface 53.

[0107] Regardless thereof, for example also provided in the embodiment according to FIG. 2 and FIG. 3, in the first region at the outlet side 40 on the rear side, i.e., transversely inside, the inner sliding surface 4 is a predetermined first region 17 and on the rear side, i.e., transversely outside, the outer one sliding surface 5 is a predetermined second region 18 having a long-fiber reinforcement, for example rovings or a knitted fabric, reinforced against a first main load direction 20 or a second main load direction 21, which corresponds to a bending movement about the axial direction 38 and/or about the travel direction 36. In one embodiment, a corresponding reinforcement is provided in predetermined regions in addition to or alone on the inlet side 39. Furthermore, alternatively or additionally, a predetermined third region 19 is provided with the same or a different type of long-fiber reinforcement against a bending movement around the travel direction 36, i.e., a third main load direction 22 shown here as a torque, i.e., on the inside of the transverse web 10.

[0108] In FIG. 2, a carrier body 8 or 9 is shown in a similar embodiment to that shown in FIG. 1, the carrier body 8 or 9 not yet having any sliding surfaces and no bearing surface and no separate layers. For elucidation, reference is made to the preceding description. The carrier body 8, 9 shown is formed, for example, in one step without insert components, for example from a BMC-prepreg.

[0109] In FIG. 3 the (half of the) damper device 1 is now shown in the final state, a (here completely enclosing) coating 35 is now applied. This coating forms the sliding surfaces 4 and 5 and the bearing surface 6.

[0110] FIG. 4 schematically shows a damper apparatus 1 in a wrap-around transmission 3, and a first strand 41 of a wrap-around means 2 is guided by means of the damper apparatus 1 and is thus dampened. The wrap-around means 2 connects an input-side cone pulley pair 25 to an output-side cone pulley pair 26 in a torque-transmitting manner. An input-side radius of action 50, on which the wrap-around means 2 runs, is in contact with the input-side cone pulley pair 25 through a corresponding spacing apart in the axial direction 38 (corresponding to the alignment of the axes of rotation 47 and 48), which here for example is rotatably connected in a torque-transmitting manner with a transmission input shaft 24 around an input-side axis of rotation 47. An output-side radius of action 51, on which the wrap-around means 2 runs, is in contact with the output-side cone pulley pair 26 through a corresponding spacing apart in the axial direction 38, which here for example is rotatably connected in a torque-transmitting manner with a transmission output shaft 27 around an output-side axis of rotation 48. The (changeable) ratio of the two radii of action 50, 51 results in the transmission ratio between the transmission input shaft 24 and the transmission output shaft 27.

[0111] Between the two cone pulley pairs 25 and 26, the first strand 41 (shown here) and the second strand 42 are shown in an ideal tangential alignment, so that the parallel alignment of the travel direction 36 is established. The transverse direction 37 shown here is defined as the third spatial axis perpendicular to the travel direction 36 and perpendicular to the axial direction 38. This is understood as a (radius of action-dependent) coordinate system moving along therewith. Therefore, both the travel direction 36 shown and the transverse direction 37 apply only to the damper apparatus 1 shown (here designed as a slide rail) and the first strand 41, and only in the case of the established input-side radius of action 50 and corresponding output-side radius of action 51 shown.

[0112] The damper apparatus 1 designed as a slide rail rests with the inner sliding surface 4 thereof and the outer sliding surface 5 thereof connected thereto by means of the (right) transverse web 10 on the first strand 41 of the wrap-around means 2. So that the sliding surfaces 4, 5 can follow the variable tangential alignment, i.e., the travel direction 36, when the radii of action 50, 51 change, the bearing surface 6 is mounted on a pivoting means 7 with a pivot axis 43, for example a conventional holding tube. As a result, the damper apparatus 1 is mounted pivotably about the pivot axis 43. In the exemplary embodiment shown, the pivoting movement is composed of a superposition of a pure angular movement and a transverse movement, so that in deviation from a movement along a circular path, a movement along an oval (steeper) curved path occurs.

[0113] In the circumferential direction 49 shown by way of example, and when the torque is input via the transmission input shaft 24, the damper apparatus 1 in the illustration forms the inlet side 39 on the left and the outlet side 40 on the right. When running as a traction mechanism drive, the first strand 41 then forms the load strand as the driving strand and the second strand 42 forms the empty strand. If the wrap-around means 2 is designed as a push link belt, under otherwise identical conditions, either the first strand 41 is guided as an empty strand by means of the damper apparatus 1, or the first strand 41 is designed as a load strand and a slack strand and the circumferential direction 49 and the travel direction 36 are reversed when torque is input via the input-side cone pulley pair 25. Alternatively, when the transmission output shaft 27 and the transmission input shaft 24 are interchanged, the output-side cone pulley pair 26 forms the torque input.

[0114] FIG. 5 shows a drive train 23 arranged in a motor vehicle 32 with the motor axis 46 thereof (optionally) transverse to the longitudinal axis 45 (optionally) in front of the driver's cab 44. Here, the wrap-around transmission 3 is connected on the input side with the electric output shaft 30 of the electric drive unit 28 and with the combustion engine output shaft 31 of the electric drive unit 29. From these drive units 28, 29 or via the drive shafts 30, 31 thereof, a torque for the drive train 23 is delivered simultaneously or at different times. However, a torque can also be absorbed by at least one of the drive units 28, 29, for example by means of the internal combustion engine for engine braking and/or by means of the electric drive machine for recuperation of braking energy. On the output side, the wrap-around transmission 3 is connected to a purely schematically illustrated output, so that here a left drive wheel 33 and a right drive wheel 34 (consumer) are supplied with torque by the drive units 28, 29 with a variable transmission ratio.

[0115] With the slide rail proposed here, inexpensive production can be achieved at the same time having high rigidity and a long service life.

REFERENCE NUMERALS

[0116] 1 Damper device [0117] 2 Wrap-around means [0118] 3 Wrap-around transmission [0119] 4 Inner sliding surface [0120] 5 Outer sliding surface [0121] 6 Bearing surface [0122] 7 Pivoting means [0123] 8 First carrier body [0124] 9 Second carrier body [0125] 10 Transverse web [0126] 11 First layer [0127] 12 Second layer [0128] 13 Third layer [0129] 14 First thickness [0130] 15 Second thickness [0131] 16 Third thickness [0132] 17 First region [0133] 18 Second region [0134] 19 Third region [0135] 20 First main load direction [0136] 21 Second main load direction [0137] 22 Third main load direction [0138] 23 Hybrid drive train [0139] 24 Transmission input shaft [0140] 25 Input-side cone pulley pair [0141] 26 Output-side cone pulley pair [0142] 27 Transmission output shaft [0143] 28 Electric drive unit [0144] 29 Internal combustion drive unit [0145] 30 Electric output shaft [0146] 31 Internal combustion output shaft [0147] 32 Hybrid motor vehicle [0148] 33 Left drive wheel [0149] 34 Right drive wheel [0150] 35 Coating [0151] 36 Travel direction [0152] 37 Transverse direction [0153] 38 Axial direction [0154] 39 Inlet side [0155] 40 Outlet side [0156] 41 First strand [0157] 42 Second strand [0158] 43 Pivot axis [0159] 44 Driver's cab [0160] 45 Longitudinal axis [0161] 46 Motor axis [0162] 47 Input-side axis of rotation [0163] 48 Output-side axis of rotation [0164] 49 Circumferential direction [0165] 50 Input-side radius of action [0166] 51 Output-side radius of action [0167] 52 Pivoting partial bearing surface [0168] 53 Axial partial bearing surface