DRUM MOTOR WITH ALTERNATIVE TRANSMISSION MOUNT

Abstract

A motor-driven conveyor roller comprises a conveyor roller tube, a first axle unit inserted into a first end of the conveyor roller tube, a first bearing unit at the first end, around which the conveyor roller tube is mounted so as to be correspondingly rotatable around the first axle unit, a drive unit, and a first gearing arranged in the conveyor roller tube and which transmits a torque, generated by the drive unit, between the conveyor roller tube and the first axle unit.

An end cap is connected fixedly in terms of torque to the conveyor roller tube at the first end and to which the first gearing is connected fixedly in terms of torque at a first gearing connection section of the end cap, wherein the end cap has a second gearing connection section, which is different from the first gearing connection section.

Claims

1.-17. (canceled)

18. A motor-driven conveyor roller comprising: a conveyor roller tube; a first axle unit inserted into a first end of the conveyor roller tube; a first bearing unit at the first end around which the conveyor roller tube is mounted so as to be correspondingly rotatable around the first axle unit; a drive unit; and a first gearing arranged in the conveyor roller tube and which transmits a torque generated by the drive unit between the conveyor roller tube and the first axle unit; wherein an end cap is connected fixedly in terms of torque to the conveyor roller tube at the first end and to which the first gearing is connected fixedly in terms of torque at a first gearing connection section of the end cap, and wherein the end cap has a second gearing connection section which is different from the first gearing connection section.

19. The conveyor roller as claimed in claim 18, wherein the first gearing connection section provides a force-fitting connection fixed in terms of torque to the first gearing.

20. The conveyor roller as claimed in claim 18, wherein the second gearing connection section provides a non-force-fitting connection fixed in terms of torque to a second gearing which is different from the first gearing and is adapted to be mounted instead of the first gearing in the conveyor roller tube.

21. The conveyor roller as claimed in claim 20, wherein the second gearing connection section provides a form-fitting connection fixed in terms of torque to the second gearing.

22. The conveyor roller as claimed in claim 18, wherein when the first gearing is connected to the first gearing connection section, the second gearing connection section does not interact with the first gearing for torque transmission.

23. The conveyor roller as claimed in claim 18, wherein the first gearing connection section is formed by a cylindrical peripheral surface that forms a press fit with a cylindrical peripheral surface of the first gearing.

24. The conveyor roller as claimed in claim 23, wherein the second gearing connection section has an axial surface or a peripheral surface having at least one projection or one depression.

25. The conveyor roller as claimed in claim 18, further comprising: a second axle unit inserted into a second end, opposite the first end, of the conveyor roller tube; and a second bearing unit at a second end of the conveyor roller tube, which is fastened in a second end cap, the second end cap being of identical design to the first end cap and fastened in the conveyor roller tube mirror symmetrically with respect to the first end cap relative to a central cross-sectional area of the conveyor roller tube.

26. The conveyor roller as claimed in claim 18, further comprising a first seal element disposed between the first axle unit and the first end cap and which is fastened in the first end cap.

27. The conveyor roller as claimed in claim 18, wherein the first gearing has a motor connection flange and is coupled by means of the motor connection flange to a motor arranged in the conveyor roller tube.

28. A conveyor roller system having a conveyor roller comprising: a conveyor roller tube; a first axle unit inserted into a first end of the conveyor roller tube; a first bearing unit at the first end around which the conveyor roller tube is mounted so as to be correspondingly rotatable around the first axle unit; a drive unit; and a first gearing arranged in the conveyor roller tube and which transmits a torque generated by the drive unit between the conveyor roller tube and the first axle unit; wherein an end cap is connected fixedly in terms of torque to the conveyor roller tube at the first end and to which the first gearing is connected fixedly in terms of torque at a first gearing connection section of the end cap, and wherein the end cap has a second gearing connection section which is different from the first gearing connection section; the conveyor roller system further comprising a second gearing having a connection region which forms, with the second gearing connection section, a connection fixed in terms of torque.

29. The conveyor roller system of claim 28, where the connection formed by the second gearing transmits torque by means of a form fit.

30. The conveyor roller system as claimed in claim 28, wherein: the second gearing connection section of the end cap has an axial surface or a peripheral surface having at least one projection or one depression, and the connection region of the second gearing has a depression or a projection which is disposed against the projection or the depression of the end cap for torque transmission.

31. The conveyor roller system as claimed in claim 28, wherein the first gearing has a first connection region, which consists of a metallic material and interacts with the first gearing connection section, and the second gearing has a second connection region, which consists of a polymer material and interacts with the second gearing connection section.

32. The conveyor roller system as claimed in claim 28, wherein the first gearing has a first motor connection flange and the first gearing is adapted to be coupled by the first motor connection flange to a motor arranged in the conveyor roller tube, and the second gearing has a second motor connection flange, which is compatible with the first connection flange, and the second gearing is adapted to be coupled by the second motor connection flange to the motor arranged in the conveyor roller tube.

33. A motor-driven conveyor roller comprising: a conveyor roller tube; a first axle unit inserted into a first end of the conveyor roller tube; a first bearing unit at the first end around which the conveyor roller tube is mounted so as to be correspondingly rotatable around the first axle unit; a drive unit; a first gearing arranged in the conveyor roller tube and which transmits a torque generated by the drive unit between the conveyor roller tube and the first axle unit; and a second gearing having a connection region that forms, with the second gearing connection section, a connection fixed in terms of torque; wherein an end cap is connected fixedly in terms of torque to the conveyor roller tube at the first end and to which the first gearing is connected fixedly in terms of torque at a first gearing connection section of the end cap, and wherein the end cap has a second gearing connection section which is different from the first gearing connection section; and

34. A method for producing a motor-driven conveyor roller, comprising the steps of: providing a conveyor roller tube having a first and a second end fastening a first end cap to the first end of the conveyor roller tube; fastening a first axle bearing unit in the first end cap and rotatably mounting a first axle unit to the first axle bearing unit; and fastening a first gearing to a first gearing connection section of the first end cap in a force-fitting manner; wherein the first end cap also has a second gearing connection section and, as an alternative to the first gearing, a second gearing is fastened to the second gearing connection section.

35. The method as claimed in claim 34, further comprising: an electric motor arranged in the conveyor roller tube and mechanically coupled to the conveyor roller tube for generating a torque between the conveyor roller tube and the first axle unit.

36. The method as claimed in claim 34, further comprising: a second axle unit arranged in a second axle bearing unit in a second end cap at the second end of the conveyor roller tube, wherein the second end cap is identical to the first end cap.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Preferred embodiments of the invention will be described on the basis of the appended figures, in which:

[0044] FIG. 1 shows a longitudinally sectioned side view of a first embodiment of a motor-driven conveyor roller according to the invention;

[0045] FIG. 2 shows an enlarged detail of the view pursuant to FIG. 1;

[0046] FIG. 3 shows a longitudinally sectioned side view of a second embodiment of a motor-driven conveyor roller according to the invention;

[0047] FIG. 4 shows an enlarged detail of the view pursuant to FIG. 3;

[0048] FIG. 5 shows a longitudinally sectioned side view in another section plane of the motor-driven conveyor roller pursuant to FIG. 3;

[0049] FIG. 6 shows an enlarged detail of the view pursuant to FIG. 5;

[0050] FIG. 7 shows a perspective view of an end cap for a motor-driven conveyor roller according to the invention; and

[0051] FIG. 8 shows a longitudinally sectioned side view of the end cap pursuant to FIG. 7.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] The basic construction of a motor-driven conveyor roller or of a drum motor can be seen from FIG. 1. A conveyor roller tube 10 extends longitudinally from a first end 11 to a second end 12. In the conveyor roller tube 10, a first axle unit 20 is arranged at the first end and a second axle unit 30 is arranged at the second end 12, said axle units 20, 30 being mounted rotatably relative to the conveyor roller tube 10 by means of ball bearings 21, 31. Consequently, the conveyor roller tube 10 can rotate around the axle units 20, 30, which in this case define an axis of rotation 100.

[0053] Also arranged in the conveyor roller tube 10 is an electric motor 40, which is designed as a synchronous motor. The stator 41 of the electric motor 40 is coupled fixedly in terms of torque to the second axle unit 30 by means of an intermediate flange 50, and an extension piece 60 and can thereby be held positionally fixed by means of the second axle unit 30. The electric motor 40 comprises a stator 41 arranged on the housing and a rotor 42 arranged in the stator. The rotor 42 is arranged on a rotary shaft 43 which is mounted so as to be rotatable about the axis 100 by means of a ball bearing in the intermediate flange 50 on that side of the electric motor 40 facing the second end 12. On that side of the electric motor facing the first end 11, the rotor shaft 43 is mounted rotatably in a further ball bearing, which is fastened fixedly in terms of torque in a face-side end disk 44 of the electric motor 40.

[0054] The face-side end disk 44 of the electric motor 40 is coupled fixedly in terms of torque to a gearing 70. In the exemplary embodiment of the invention shown, the gearing is designed as a metallic planetary gearing having three stages, which is able to bear high loads. The internal gear of the first stage of the gearing, which stage is situated toward the electric motor, is connected fixedly in terms of torque to the face-side end cover 44 of the gearing. The rotor shaft 43 of the electric motor 40 drives the sun gear of the first stage. The planet carrier of the first stage serves as the drive output of the first stage and drives the sun gear of the second stage. The planet carrier of the second stage serves as the drive output of the second stage and drives the sun gear of the third stage. The internal gears of the first two stages are interconnected fixedly in terms of torque and are situated positionally fixed in the conveyor roller tube 10.

[0055] The planet carrier of the third stage is connected fixedly in terms of torque to the first axle unit 20 and is therefore positionally fixed. The internal gear 75 of the third gearing stage serves as the drive output of the planetary gearing 70.

[0056] FIG. 2 shows, in a detail providing a better view, the coupling of the drive output of the gearing 70. As can be seen, the internal gear 75 is provided with an encircling shoulder on the side facing the first end 11. Said shoulder contains an outer peripheral surface 75a and an axial face surface 75b. The outer peripheral surface 75a is a surface which is formed with a narrow tolerance and is press-fitted to an inner peripheral surface 85a of an end cap 80. The torque which is generated at the gearing output can therefore be transmitted from the gearing output 75 to the end cap 80 by way of the force-fitting connection between the surfaces 75a and 85a.

[0057] The end cap 80 has a passage bore 81 in which a radial shaft sealing ring 90 and the ball bearing 21 are fastened in two corresponding encircling shoulders. The radial shaft sealing ring seals off with respect to the axle unit 20 in that a running ring 22 is arranged on said axle unit and the sealing lip seals off on the outer peripheral surface of said running ring. The ball bearing 21, with its inner ring, likewise bears on the running ring 22. The outer ring of the ball bearing is held in the end cap 80.

[0058] The end cap 80 is furthermore pressed into the conveyor roller tube 10 fixedly in terms of torque via an outer peripheral surface 86. A press-fit is likewise realized at this outer peripheral surface 86, and the torque is transmitted via this press fit to the conveyor roller tube.

[0059] The end cap 80 furthermore has an axially extending ring-shaped groove on that side of the end cap facing the second end. Said ring-shaped groove is subdivided by multiple radially extending ribs 88a, 88b, 88c, and so on. The ring-shaped groove 88 with the ribs 88a, 88b, 88c, and so on forms a section which is suitable for torque transmission. In the embodiment shown in FIGS. 1 and 2, said section is not required for torque transmission.

[0060] FIGS. 3-6 illustrate a second embodiment of the invention. The basic construction of the motor-driven conveyor roller as per this second embodiment corresponds to the construction of the motor-driven conveyor roller as per FIGS. 1 and 2. Just like the latter, the motor-driven conveyor roller illustrated in FIGS. 3-6 comprises an electric motor 140 which is arranged in a conveyor roller tube 110 which is mounted so as to be rotatable around a first axle unit 120 and a second axle unit 130.

[0061] The embodiment shown in FIGS. 3-6 is likewise equipped with a gearing 170. This gearing is again designed as a three-stage planetary gearing, the toothed gears of this planetary gearing, however, unlike those of the first embodiment, consisting not of a metallic material but of a polymer material, use being made specifically of toothed gears composed of polyoxymethylene (POM, also known as polyacetal) in the case of this gearing. As in the first embodiment, the internal gear 175 of the third gearing stage serves as a gearing drive output. The internal gear 175 is connected fixedly in terms of torque to the end cap 80 for this purpose. Overall, the end cap 80 is of identical construction to the end cap 80 of the first embodiment. Accordingly, the end cap 80 may be used for both the first and second embodiments of the motor-driven conveyor roller.

[0062] In the second embodiment shown in FIGS. 3-6, a press fit is not formed between the gearing drive output and the inner peripheral surface 85a of the end cap 80. The internal gear 175 instead has axially extending fingers 176a, 176b, 176c, and so on, which engage between the ribs 88a, 88b, 88c, and so on, of the end cap 80. Said fingers 176a, 176b, 176c, and so on, thus provide a form fit with the ribs 88 of the end cap, and the torque at the gearing output is transmitted via this form fit between the fingers 176a, 176 b, 176c, and so on, and the ribs 88a, 88b, 88c, and so on, of the end cap. The gearing connection section formed by the inner peripheral surface 185a is unused in the second embodiment. This configuration results in a connection fixed in terms of torque between the end cap 80 and the gearing 170, which connection is ideal for the toothed-gear material POM used.

[0063] Shown in greater detail in FIG. 4 is a section through a finger 176a which engages into the ring-shaped groove 88 between two ribs 88a, 88b. FIG. 6 shows in greater detail a section which, by comparison, is situated in another section plane. In this section, the section is taken though a rib 88a. As can be seen, no finger of the internal gear 175 extends in this region, but rather there is a depression arranged between the fingers in this angular region.

[0064] FIG. 7 shows a perspective view of the end cap which is inserted into the conveyor roller tube at the first end in the motor-driven conveyor rollers as per FIGS. 1-6. The radially extending ribs 88a, 88b, 88c, between which in each case depressions into which the fingers 176a, 176b, 176c of the internal gear 175 can engage are formed, can be seen.

[0065] The wall thickness of the ribs 88 extends slightly conically from the inside outward, and so inwardly there is a smaller wall thickness than outwardly. Consequently, it is possible for the fingers 176a, 176b, 176c, designed in a manner congruent thereto, to engage into the intermediate spaces 89a, 89b, 89c and to be centered on the ribs 88a, 88b, 88c. The embodiment as per FIG. 2 can thus also bring about reliable centering of the internal gear on the end cap with simultaneous form-fitting force transmission which is fixed in terms of torque.

[0066] FIG. 8 shows a longitudinal section through the formation of the end cap as per FIG. 7, which is used in the motor-driven conveyor rollers in FIGS. 1-6. The section of FIG. 8 is taken through the intermediate space 89a, 89d between two ribs 88a, 88b and 88d, 88e, and so in each case ribs 88a, 88d are viewed in FIG. 8. The inner peripheral surface 85a, which serves for the formation of the press fit with the outer peripheral surface 75a of the metallic gearing of the first embodiment, can also be seen.