TRANSMISSION WITH A HOUSING PART AND A COVER

Abstract

A transmission includes a housing part and a cover. A bead which borders a surface region of the housing part is molded onto the housing part, and a precision-machined surface is formed on the bead. The cover is connected to the housing part, and a seal, e.g., a flat seal, which is arranged on the surface, is arranged between the cover and the surface. A spatial region is delimited by the cover and the surface region and the bead. A bearing cover is arranged in the spatial region, and the bearing cover is connected to the housing part and rests against another surface which is formed on an additional bead. The other surface has an interrupted configuration.

Claims

1-15. (canceled)

16. A transmission, comprising: a housing part including a bead that borders a surface region of the housing part and is arranged as a molded portion of the housing part, a precision-machined surface being arranged on the bead; a cover connected to the housing part; a seal arranged on the precision-machined surface between the cover and the precision-machined surface; and a bearing cover; wherein a spatial region is delimited by the cover, the surface region, and the bead, the bearing cover being arranged in the spatial region, being connected to the housing part, and resting against another surface arranged on an additional bead and being uninterrupted.

17. The transmission according to claim 16, wherein the bead projects from a surface of the housing part.

18. The transmission according to claim 16, wherein the bead is arranged as a molded thickening of the housing part.

19. The transmission according to claim 16, wherein the precision-machined surface is arranged as a flat surface and a sealing surface.

20. The transmission according to claim 16, wherein the seal includes a flat seal.

21. The transmission according to claim 16, the other surface is arranged as a flat surface and/or a precision-machined surface.

22. The transmission according to claim 16, wherein the precision-machined surface includes threaded bores, screws that are screwed into the threaded bores pressing the cover toward the housing part.

23. The transmission according to claim 16, further comprising a rotatably mounted intermediate shaft, the other surface being interrupted in a circumferential direction around an axis of rotation of the intermediate shaft.

24. The transmission according to claim 23, wherein a surface, on which the cover rests, extends completely uninterrupted in the circumferential direction around the intermediate shaft.

25. The transmission according to claim 23, wherein a cutout of the housing part, arranged as a first oil channel, leads from the spatial region to a first bearing of the intermediate shaft through a region of the other surface.

26. The transmission according to claim 25, wherein a further cutout arranged as another oil channel is arranged in the housing part and leads from the spatial region to a bearing of a driven shaft of the transmission.

27. The transmission according to claim 26, wherein an additional cutout arranged as a third oil channel is arranged in the housing part and leads from the spatial region to a first bearing of a driving shaft of the transmission.

28. The transmission according to claim 27, wherein the first bearing is arranged as a double bearing and/or the third oil channel opens centrally between two bearings of the double bearing.

29. The transmission according to claim 16, wherein the third oil channel includes a branch arranged in the housing part that opens between the first bearing and a second bearing of the driving shaft.

30. The transmission according to claim 23, wherein the intermediate shaft is adapted to drive a suction pump that is adapted to deliver oil into the spatial region via an oil line and/or via a channel formed in the housing part.

31. The transmission according to claim 30, wherein the suction pump is arranged on a side of a second bearing of the intermediate shaft that faces away from a first bearing of the intermediate shaft.

32. The transmission according to claim 31, wherein the first bearing of the intermediate shaft and a first bearing of a driven shaft of the transmission are arranged above an oil level of the transmission when the transmission is at a permanent standstill.

33. The transmission according to claim 16, wherein a driving shaft of the transmission is connected to a fan in a rotationally fixed manner, the fan adapted to convey an airflow guided along cooling fins of the cover.

34. The transmission according to claim 33, wherein a fan hood surrounding the fan is detachably connected to the housing part.

35. The transmission according to claim 34, wherein the fan hood is adapted to direct the air flow conveyed by the fan along the cooling fins of the cover.

36. The transmission according to claim 33, wherein the cooling fins are aligned parallel to an axis of rotation of the driving shaft.

37. The transmission according to claim 16, wherein molded foot regions of the housing part, are arranged on a side of the housing part facing away from the cover.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG. 1 is a cross-sectional view of a transmission having a housing part 1.

[0026] FIG. 2 is a longitudinal cross-sectional view of the transmission.

[0027] FIG. 3 is a perspective view of the transmission.

DETAILED DESCRIPTION

[0028] As illustrated in the Figures, the transmission has a driving shaft 12, the bearings of which are accommodated in a bearing flange which is connected to the housing part 1 via screws.

[0029] The driving shaft 12, which is arranged as a toothed pinion, meshes with a gear 9, which is connected to an intermediate shaft 5 in a rotationally fixed manner.

[0030] The intermediate shaft 5 is, for example, aligned vertically.

[0031] The driving shaft 12 is aligned perpendicular to the intermediate shaft 5, e.g., because the driving transmission stage of the transmission is an angular transmission stage.

[0032] Another toothing, which is incorporated directly on the intermediate shaft 5 or which is provided on a gear which is connected to the intermediate shaft 5 in a rotationally fixed manner, meshes with another gear which is connected to the driven shaft 8 in a rotationally fixed manner.

[0033] The driven shaft 8 is aligned parallel to the intermediate shaft 5.

[0034] At least one of the bearings of the driven shaft is accommodated in the housing part 1.

[0035] A bearing 2 of the intermediate shaft 5 is also accommodated in the housing part.

[0036] A bead is molded onto housing part 1, e.g., on the top side of the housing part 1 as seen in the vertical direction, which bead projects in particular in the vertical direction and borders a surface region of the housing part 1, on which bead a precision-machined surface acting as a sealing surface 31 is provided, on which a cover 3 is placed, and a seal arranged between the cover 3 and the sealing surface 31, e.g., a flat seal, seals the spatial region covered by the cover and formed between the cover 3 and the housing part 1.

[0037] A suction pump 20 driven by the intermediate shaft 5 draws in the oil provided in the interior of the transmission, e.g., from the oil sump, and conveys the oil through the oil line 21, which leads to an oil channel arranged in the housing part 1.

[0038] This oil channel is, for example, composed of radial bores 22 and axial bores 23, 24 in relation to the axis of rotation of the intermediate shaft and opens into the spatial region.

[0039] Thus, the spatial region forms an oil reservoir, e.g., an intermediate buffer. The bearings of the driven shaft 8 on the one hand and the bearings of the intermediate shaft 5 and the driving shaft 12 on the other are supplied from the spatial region via additional channels.

[0040] The cover 3 has cooling fins on its outer side so that the heat of the oil in the spatial region is efficiently dissipated to the environment.

[0041] A bearing cover 4 is placed on another sealing surface 30 of the housing part 4, which other sealing surface 30 is also provided on a bead molded onto the housing part 1 and projects, for example, in the vertical direction and borders a partial region of the surface region of the housing part 1. This other sealing surface 30 is precision-machined. The bearing cover 4 is placed on this other sealing surface 30 and fastened to the housing part 4 via screws which pass through the bearing cover 4 and are screwed into threaded bores in the other sealing surface.

[0042] A seal, e.g., a flat seal, can optionally be arranged between the bearing cover 4 and the sealing surface 30. However, a leak on the other sealing surface is harmless, since oil seeping through flows down to the bearings of the intermediate shaft 5 and thus supports the lubrication and cooling of these bearings.

[0043] For example, the bearing cover 4 accommodates an adjustment bearing 6 which allows oil to pass through and thus provides for a flow of oil from the spatial region through the adjustment bearing 6 to the bearing 2 located axially thereunder in the direction of the axis of rotation of the intermediate shaft 5. This provides for the lubrication and cooling of the bearing 2.

[0044] Alternatively or additionally, an additional oil flow from the spatial region to the bearing 2 is made possible in that the other sealing surface 30 is not completely circumferential around the axis of rotation of the intermediate shaft 5, but has an interrupted configuration. In this interruption region, a distance is created between the bearing cover 4 and the housing part 1, so that oil can enter and penetrate to the bearing 2 of the intermediate shaft 5, e.g., through the bearing cover 4.

[0045] Threaded bores are also made in the sealing surface 31, into which screws are screwed, the screw heads of which press the cover 3 towards the sealing surface 31 and which screws project through the cover 4.

[0046] Another channel for lubricating oil is provided in housing part 1. This other channel opens, on the one hand, into the spatial region and, on the other hand, into a region which is arranged centrally between the two bearings of a double bearing 17 of the driving shaft 12. Thus, improved lubrication of this double bearing is made possible.

[0047] The double bearing 17 is, for example, accommodated in a bearing cup, which is connected to the housing part 1 via screws. However, the bearing cup projects from the housing part 1 towards the environment, so that, with regard to lubricating oil from the oil sump, the double bearing 17 would be inadequately supplied with lubricant without the lubrication supplied through the other channel.

[0048] The vertical projection of the double bearing 17 into a plane which contains the axis of rotation of the driving shaft 12 and whose normal direction is aligned parallel to the axis of rotation of the intermediate shaft 5 is arranged outside the vertical projection of the housing part 1 into this plane or overlaps with the vertical projection of the housing part 1 into this plane. For this reason, it is more difficult for the lubricating oil from the oil sump to access the double bearing 17. However, lubricating oil is fed directly from the spatial region through the other channel, thus ensuring the lubrication of the double bearing 17.

[0049] The sealing surface 31, on which the cover 3 rests, extends completely uninterrupted in the circumferential direction around the intermediate shaft 5. Thus, a high type of protection can be achieved.

[0050] A fan 11 is connected to the driving shaft 12 in a rotationally fixed manner at the region of the driving shaft 12 which region projects towards the environment. A fan hood 10 surrounds the fan 11 and is detachably connected to the housing part 1.

[0051] The air flow conveyed by the fan wheel 11 is directed by the fan hood 10 such that it flows along the cooling fins molded onto the cover 3, which project towards the environment and extend parallel to the axis of rotation of the driving shaft.

[0052] In this manner, improved heat dissipation can be achieved and the heat of the oil in the spatial region can thus be dissipated.

[0053] The spatial region is arranged as flat as possible so that almost the entire length of the cover 3 can be used to cool the oil.

[0054] For example, the extension of the spatial region in the direction of the axis of rotation of the driving shaft is greater, e.g., at least ten times greater, than in the direction of the axis of rotation of the intermediate shaft 5.

[0055] The housing part 1 also has cooling fins on its outer surface, which projects outwards, so that the dissipation of heat from the transmission is improved.

[0056] In addition, on at least one side wall of the housing part 1, a cover part covers a cutout in the side wall, and the cover part also has cooling fins on its outer surface.

[0057] The housing part 1 is, for example, produced in two pieces, i.e., composed of a bottom part and an upper part placed thereon.

[0058] Additionally, according to example embodiments, instead of the adjustment bearings 6, which are arranged as rolling bearings, e.g., cylindrical roller bearings, no bearing is provided, but only a continuous cutout in the bearing cover 4 is provided, e.g., so that a flow of oil from the spatial region to the bearing 2 is permitted.

LIST OF REFERENCE NUMERALS

[0059] 1 Housing part [0060] 2 Bearing [0061] 3 Cover [0062] 4 Bearing cover [0063] 5 Intermediate shaft [0064] 6 Adjustment bearing [0065] 7 Bearing [0066] 8 Driven shaft [0067] 9 Gear [0068] 10 Fan hood [0069] 11 Fan [0070] 12 Driving shaft [0071] 13 Radial bore [0072] 14 Axial bore [0073] 15 Radial bore [0074] 16 Channel for oil [0075] 17 Double bearing [0076] 18 Double bearing [0077] 20 Suction pump, e.g., passive suction pump [0078] 21 Oil line [0079] 22 Radial bore in relation to the axis of rotation of the intermediate shaft [0080] 23 Axial bore in relation to the axis of rotation of the intermediate shaft [0081] 24 Radial bore in relation to the axis of rotation of the intermediate shaft [0082] 30 Sealing surface for bearing covers 4 [0083] 31 Sealing surface for covers 3