TRANSMISSION AND METHOD FOR PRODUCING DIFFERENT TRANSMISSIONS, IN PARTICULAR A RANGE OF TRANSMISSIONS

Abstract

A transmission includes a first housing part, a second housing part connected to the first housing part, and bearings accommodated in the first housing part and supporting an input shaft in a rotatable manner. The input shaft projects through a recess that extends through the second housing part, and a cover part is connected to the first housing part. The cover part or a flange part inserted into the cover part accommodates a sealing system, which provides sealing with respect to the input shaft. The second housing part has an inlet for lubricating oil, which terminates in an axial bore being open with respect to the side of the first housing part facing the cover part, and in a second annular space. The opening of the axial bore facing the cover part is covered and/or sealed by the cover part, and rolling elements of two bearings at least also restricting and/or surrounding the second annular space together with the first housing part.

Claims

1-14. (canceled)

15. A transmission, comprising: a first housing part having a first recess that extends through the first housing part; a cover part connected to the first housing part. a second housing part connected to the first housing part; an input shaft projecting through the first recess of the first housing part; a sealing system sealing the input shaft accommodated by the cover part or a flange part arranged in the cover part; and bearings accommodated in the first housing part and supporting the input shaft in a rotatable manner; wherein the second housing part includes a lubricating oil inlet that terminates in an axial bore provided the first housing part and is open with respect to a side of the first housing part facing the cover part, and in a second annular space; an opening of an axial bore facing the cover part being covered and/or sealed by the cover part to form a blind hole; and wherein rolling elements of two bearings restrict and/or surround the second annular space.

16. The transmission according to claim 15, wherein the bearings include (a) a fixed bearing that includes two angular contact bearings and/or tapered roller bearings and (b) a floating bearing.

17. The transmission according to claim 15, wherein the first housing part projects through a second recess that extends through the second housing part.

18. The transmission according to claim 15, wherein the cover part is connected to the first housing part in an oil-tight manner with respect to the environment.

19. The transmission according to claim 16, wherein the rolling elements of the two bearing include rolling elements of one of the two angular contact bearings of the fixed bearing and the floating bearing.

20. The transmission according to claim 15, wherein the rolling elements of the two bearings restrict and/or surround a first annular space together with the second housing part and together with a spacer bushing arranged on the input shaft.

21. The transmission according to claim 15, wherein the second annular space includes a stepped bore of the first housing part having an axially aligned bore axis and an annular groove that encircles a step of the stepped bore.

22. The transmission according to claim 15, wherein a compensation bore is adapted to conduct lubricating oil from the second annular space into a first annular space.

23. The transmission according to claim 22, wherein rolling elements of a first one of the bearing and/or a first angular contact bearing of a fixed bearing are adapted to be supplied with the lubricating oil from the first annular space.

24. The transmission according to claim 23, wherein the rolling elements of the first one of the bearings are arranged in an oil sump formed in the first annular space.

25. The transmission according to claim 22, wherein the first annular space arranged as a depression and/or a cup-shaped depression in the cover part and is restricted both by the cover part and the first housing part.

26. The transmission according to claim 15, wherein the transmission is configured so that lubricating oil passing through a second one of the two bearings flows into an interior space of the transmission that accommodates at least one gear stage of the transmission.

27. The transmission according to claim 26, wherein the transmission is configured to that lubricating oil passing through the second one of the two bearings flows into the interior space of the transmission that accommodates the gear stage of the transmission and into an oil sump located in the interior space.

28. The transmission according to claim 26, wherein the second one of the two bearings includes a floating bearing.

29. The transmission according to claim 15, wherein a collection duct is arranged in an interior space of the transmission and terminates in an inlet, the collection duct adapted to catch lubricating oil that drips down and/or splashes around and/or that drips down an inner wall of the second housing part and to conveys the lubricating oil to the inlet.

30. The transmission according to claim 15, wherein the two bearings are set apart from each other by a spacer bushing arranged on the input shaft.

31. The transmission according to claim 15, wherein the two bearings include a fixed bearing and a floating bearing that are set apart from each other by a spacer bushing arranged on the input shaft.

32. The transmission according to claim 15, wherein the sealing system includes a first shaft sealing ring, a contactless seal, and/or a labyrinth seal.

33. The transmission according to claim 32, wherein a grease-lubricated further shaft sealing ring is arranged axially next to the first shaft sealing ring and/or the sealing system includes a dust-protected shaft seal.

34. The transmission according to claim 15, wherein a first bearing includes a fixed bipartite bearing including two bearing parts and/or tapered roller bearings.

35. The transmission according to claim 34, wherein each bearing part is arranged as an angular contact bearing.

36. The transmission according to claim 34, wherein the transmission is configured so that lubricating oil flowing in on both sides along rolling elements of the first bearing flows into an annular region axially between the rolling elements of the two bearing parts, from where the lubricating oil is conveyed during rotary motion of the bipartite bearing into an oil outlet, arranged above the bearings, into a rest of an interior space of the transmission that accommodates gear stages, an entire inner space of the transmission encompassing an annular region, first and second annular spaces, and a rest of the interior space.

37. The transmission according to claim 15, wherein a retaining wall arranged as a sheet metal part is arranged on the first housing part, and a gap is provided between the input shaft and the retaining wall.

38. The transmission according to claim 15, wherein the bearings are braced with respect to one another by a shaft nut screwed onto a threaded region of the input shaft.

39. The transmission according to claim 38, wherein a region covered by the shaft nut in an axial direction overlaps with a region covered by the cover part in the axial direction.

40. A method for producing different transmissions, comprising: connecting a first cover part to a first one of a first housing part to produce a first transmission as recited in claim 15; and connecting a second cover part to a second one of the first housing part to produce a second transmission as recited in claim 15, the second cover part including a channel, the axial bore terminating the channel, the channel adapted to supplying lubricating oil to the sealing system and/or a shaft sealing ring of the sealing system accommodated in the second cover part.

41. The method according to claim 40, wherein the different transmissions includes a range of transmissions.

42. The method according to claim 40, wherein, in the second transmission, an overflow channel arranged in the second cover part terminates on one side in a region of the second cover part that accommodates the sealing system and terminates on another side in a first annular space.

43. The method according to claim 40, wherein a third cover part is connected to the first housing part to produce a third transmission, the third cover part having a channel that terminates in a space region that accommodates the sealing system and in which an inflow channel for pressurized oil terminates, arranged in the first housing part.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In FIGS. 1.1 to 6.2, the cutting direction through a transmission is shown in the upper left region. Also shown in the respective Figure is the associated sectional image.

[0024] FIG. 1.1 is a cross-sectional view of a transmission according to an example embodiment of the present invention featuring immersion lubrication and a shaft sealing ring.

[0025] FIG. 1.2 is another cross-sectional view of the transmission illustrated in FIG. 1.1.

[0026] FIG. 2.1 is a cross-sectional view of a transmission according to an example embodiment of the present invention featuring immersion lubrication and a dust-protected shaft seal.

[0027] FIG. 2.2 is another cross-sectional view of the transmission illustrated in FIG. 2.1.

[0028] FIG. 3.1 is a cross-sectional view of a transmission according to an example embodiment of the present invention featuring immersion lubrication and a contactless seal.

[0029] FIG. 3.2 is another cross-sectional view of the transmission illustrated in FIG. 3.1.

[0030] FIG. 4.1 is a cross-sectional view of a transmission according to an example embodiment of the present invention featuring pressure lubrication and a shaft sealing ring.

[0031] FIG. 4.2 is another cross-section view of the transmission illustrated in FIG. 4.1.

[0032] FIG. 5.1 is a cross-sectional view of a transmission according to an example embodiment of the present invention featuring pressure lubrication and a dust-protected shaft seal.

[0033] FIG. 5.2 is another cross-sectional view of the transmission illustrated in FIG. 5.1.

[0034] FIG. 6.1 is a cross-sectional view of a transmission according to an example embodiment of the present invention featuring pressure lubrication and a contactless seal.

[0035] FIG. 6.2 is another cross-sectional view of the transmission illustrated in FIG. 6.1.

[0036] FIG. 7 illustrates shows different spatial positions of the transmission that are able to be covered by the previously mentioned example embodiments.

DETAILED DESCRIPTION

[0037] As schematically illustrated in FIGS. 1.1 and 1.2, the transmission has immersion lubrication. The rotating toothed parts dip into the oil sump of the transmission and fling oil into the interior space of the transmission up to its upper inner wall or ceiling, the interior space being arranged on a housing part 8 of the transmission. Oil dripping down from there is caught in a collection duct and conveyed into an oil inlet 10 that is introduced into a housing part 1.

[0038] This inlet 10 has a radial bore, which is introduced into housing part 1 and terminates in a recess of housing part 1 covered by housing part 8 of the transmission.

[0039] From this recess, an axial bore guides the oil along and terminates in an axial bore of a cover part 2 which is placed on top of housing part 1.

[0040] Housing part 1 accommodates a first angular contact bearing 9 of a fixed bearing, e.g., a tapered roller bearing, and a second angular contact bearing 21, e.g., a spherical roller bearing arranged as a floating bearing, for the support of the input shaft which is connected in a torsionally fixed manner to a bevel pinion meshing with a crown wheel, i.e., a counter wheel of the bevel pinion, which drives a second gear stage of the transmission.

[0041] The inner ring of the angular contact bearing 21 is placed against a step developed on the input shaft. A spacer sleeve is situated on the input shaft between the inner ring of the angular contact bearings (9, 21). Via a spacer ring 22, a shaft nut 25 which is screwed onto an external threaded region of the input shaft applies axial pressure on the inner ring of the first angular contact bearing 9, e.g., the bipartite fixed bearing, e.g., such that the bearings are adjusted.

[0042] The outer rings of the bearings on the one hand are placed against a step provided in respective housing part 1 and axially fixed in place with the aid of a circlip and/or spacer ring on the other hand.

[0043] Cover part 2 covers the fixed bearing and to this end is connected to housing part 1 by an interposed flat seal, e.g., in an oil-tight manner. However, instead of the flat seal, it is also possible to use a seal provided with a surface sealing compound, e.g., an adhesive being used as the surface sealing compound.

[0044] Cover part 2 accommodates a shaft sealing ring which extends on the input shaft.

[0045] The cover part has a retaining wall 18, which projects radially inward in the direction of the input shaft. A radial depression, in which an oil sump 101 accumulates, is arranged between retaining wall 18 and the shaft sealing ring. When the input shaft executes a rotary motion, this oil sump wets the shaft with oil and also supplies oil to the sealing lip of the shaft sealing ring.

[0046] A small gap exists between the input shaft and retaining wall 18 so that no oil tightness exists with respect to an annular space 27 which is arranged on housing part 1 and radially surrounds shaft nut 25. In addition, an overflow channel 12 is arranged on housing part 1, which is situated at a higher point than retaining wall 18, terminates in annular space 27 and is able to be filled from the radial depression arranged axially between the shaft sealing ring and retaining wall 18.

[0047] The oil conveyed through the axial bore in cover part 2 is routed via a radial bore to the particular region arranged axially between the shaft sealing ring and retaining wall 18 on cover part 2.

[0048] A first channel is therefore arranged in housing part 1, which supplies oil via the recess to channel 11 arranged in cover part 2.

[0049] Annular space 27 radially surrounding shaft nut 25 has an open configuration in the direction of the rolling element of bearing 9 so that oil from annular space 27 lubricates first angular contact bearing 9 of the fixed bearing.

[0050] In addition, a compensation channel 13 terminates in first annular space 27 and conveys the oil into a second annular space 28, which is arranged on housing part 1 axially between the bearings (9, 21), e.g., between the fixed bearing and the floating bearing.

[0051] This second annular space 28 has an open configuration axially on both sides in the direction of the rolling elements of the bearings (9, 21), e.g., the fixed bearing and the floating bearing, so that they are able to be supplied with oil.

[0052] Although a channel leads from the recess of housing part 1 into second annular space 28, this channel is sealed by a plug 24.

[0053] Excess oil therefore drains through floating bearing 21 by an overflow 14, which is arranged as a sheet metal part and fastened to housing part 1, into the interior space of the transmission accommodating the gear stages.

[0054] Second annular space 28 is formed by a stepped bore at whose step a circumferential annular groove is provided.

[0055] A plug 26 seals a radial bore which terminates in compensation channel 13 and is optionally provided for a pressure lubrication.

[0056] As illustrated in FIG. 1.2., the fixed bearing includes two parts, e.g., two angular contact bearings, e.g., tapered roller bearings. The oil flowing in on both sides along the rolling elements of the bipartite fixed bearing collects in an annular region axially between the rolling elements where it is subjected to the pumping action during the rotary motion of fixed bearing 9, so that the oil flows into an oil outlet 15 axially extending above the bearings (9, 21) to the rest of the interior space of the transmission accommodating the gear stages.

[0057] The oil lubrication flow brings about a lubrication of the bearings (9, 21) and the shaft sealing ring on the one hand and cooling of cover part 2 and housing part 1 together with the components surrounded by these two parts on the other hand.

[0058] As illustrated in FIG. 2.1 in conjunction with 2.2, the transmission there—in contrast to the example embodiment illustrated in FIGS. 1.1 and 1.2—has a different cover part 2 into which a flange part 3 is inserted.

[0059] Situated axially next to the shaft sealing ring is a further shaft sealing ring whose sealing lip also extends on the input shaft. This further shaft sealing ring is greased and the grease is stored in a grease chamber, which is situated axially between a dust-protected shaft sealing ring.

[0060] This dust-protected shaft sealing ring has a gap between the input shaft and flange part 3 and a sheet metal part that projects into a recess of flange part 3. In addition, a dust lip produced from plastic is situated on the sheet metal part, the dust lip sitting on flange part 3 so as to be substantially in contact, the sheet metal part being situated at a slight distance from flange part 3.

[0061] As illustrated in FIG. 3.1 in conjunction with 3.2, the transmission there—in contrast to the example embodiment illustrated in FIGS. 1.1 and 1.2—has a different cover part 2 which seals the axial bore disposed in housing part 1 and leads to cover part 2.

[0062] A flange part 3, which accommodates a contactless seal provided with respect to the input shaft, is inserted into a centered, axially continuous recess of this cover part 2. This seal requires no lubricating oil and must be kept away from lubricating oil. To this end, retaining wall 18 arranged on cover part 2 has only a gap in the direction of the input shaft, and the contactless seal inserted on flange part 3 provides sealing from the input shaft in the event that oil appears at the axial inner side of the contactless seal nevertheless. Thus, a first seal 19 is arranged as a gap seal, and a second seal 20 is arranged as a contactless seal, e.g., a labyrinth seal.

[0063] The contactless seal is, for example, arranged as a labyrinth seal.

[0064] The oil flow is changed by a removed plug 24, which allows oil to pass from the recess of housing part 1 through a radial bore into second annular space 28. This is because no flow of oil takes place through the axial bore of housing part 1 supplied via the recess on account of the seal provided by cover part 2.

[0065] The rolling elements of bearings 9 and 21 are in turn supplied from second annular space 28.

[0066] In addition, however, the oil also flows from second annular space 28 through compensation channel 13 to first annular space 27 and from there, axially from the front, to the rolling elements of the first angular contact bearing 9, e.g., to the rolling elements of the first part of first angular contact bearing 9 of the fixed bearing.

[0067] The oil arriving in the center in bearing 9 is in turn conveyed into outlet 15 during the movement of the fixed bearing.

[0068] However, if oil still reaches the annular space between cover part 2 and flange part 3, situated axially between the dust-protected shaft seal and cover part 2, then this oil is drained through a downward-directed radial bore of cover part 2, which terminates in an axial bore of cover part 2 which in turn terminates either by itself or in the oil sump of the transmission via a radial bore that is directed further downward.

[0069] As illustrated in FIG. 4.1 in conjunction with 4.2, the transmission there—in contrast to the example embodiment illustrated in FIGS. 1.1 and 1.2—the transmission there has a different cover part 2, which once again seals the axial bore that is situated in housing part 1 and leads to cover part 2.

[0070] For the pressure lubrication configuration, plug 26 is removed and an oil line is connected to the radial bore implemented in housing part 1, from where oil is pressed into an axial bore which is sealed by a plug 5 from second annular space 28. The axial bore terminates in a channel, which, for example, includes an axial bore and a radial bore, the channel in cover part 2 terminating in the annular space situated axially between the shaft sealing ring accommodated in cover part 2 and retaining wall 18.

[0071] From this annular space, oil flows toward first annular space 27 and from there to the rolling elements of bearing 9 on the one hand and through an axial bore, which is set apart from the compensation bore in the circumferential direction, into second annular space 28, from where the rolling elements of bearings 9 and 21 are once again supplied with oil. The oil then emerges from bearing 21 on the side axially facing away from second annular space 28 to the interior space of the transmission accommodating the gear stages.

[0072] As illustrated in FIG. 5.1 in conjunction with 5.2, the transmission there—in contrast to the example embodiment illustrated in FIGS. 4.1 and 4.2—has a different cover part 2 in which a flange part is inserted once again, which has a further shaft sealing ring which is supplied with lubricating grease from the grease chamber again and includes the dust-protected shaft seal.

[0073] The lubrication of the shaft sealing ring directly facing the shaft nut, i.e. the first sealing ring, once again is carried out as in the example embodiment illustrated in FIGS. 4.1 and 4.2.

[0074] The oil conveyed under pressure is pressed through the channel situated in cover part 2 into the interspace between flange part 3 and cover part 2, the interspace being restricted not only by flange part 3 and cover part 2 but also by the first shaft sealing ring, which is thereby supplied with oil.

[0075] As illustrated in FIG. 6.1 in conjunction with 6.2, the transmission there—in contrast to the example embodiment illustrated in FIGS. 4.1 and 4.2—has a different cover part 2 into which a flange part having a contactless seal is inserted. The contactless seal is once again arranged according to the example embodiment illustrated in FIGS. 3.1 and 3.2.

[0076] In contrast, the oil conveyed under pressure is pressed out of the axial bore of housing part 1 into second annular space 28 because first annular space 27 is blocked by a plug 6 in the axial bore.

[0077] Via compensation channel 13, first annular space 27 is supplied with oil from second annular space 28.

[0078] From second annular space 28 filled with pressurized oil via the axial bore, the rolling elements of bearings 9 and 21 are in turn axially supplied on both sides. The fixed bearing includes two angular contact bearings, e.g., tapered roller bearings. The pumping action of the fixed bearing that includes the first angular contact bearing 9 and the further angular contact bearing conveys the oil collecting in the axial interspace between the two angular contact bearings in the upward direction into outlet 15 from where the oil flows into the rest of the interior space of the transmission.

[0079] The oil draining from bearing 21 on its side facing away from bearing 9 is directly introduced into the interior space of the transmission accommodating the gear stages.

[0080] FIG. 7 illustrates different spatial positions of the transmission that are able to be covered by the previously mentioned example embodiments. A single one of the illustrated example embodiments is not able to cover all illustrated spatial positions on its own. However, when using all of the example embodiments illustrated in FIGS. 1.1 to 6.2, the multitude of spatial positions illustrated in FIG. 7 is obtainable. Other spatial positions that result by pivoting the transmission about random spatial axes are possible in addition.

[0081] In further example embodiments, the transmission has a multi-stage configuration in which the input gear stage furthermore is a bevel gear stage and the downstream ones are spur gear stages.

LIST OF REFERENCE NUMERALS

[0082] 1 housing part [0083] 2 cover part [0084] 3 flange part [0085] 4 sheet metal part, e.g., retaining plate [0086] 5 first plug [0087] 6 first plug [0088] 7 pressurized oil line [0089] 8 housing part [0090] 9 bearing [0091] 10 inlet for oil [0092] 11 channel [0093] 12 overflow channel [0094] 13 compensation channel [0095] 14 overflow [0096] 15 oil outlet [0097] 16 oil return channel [0098] 17 inlet for pressurized oil [0099] 18 retaining wall [0100] 19 first seal [0101] 20 second seal [0102] 21 bearing [0103] 22 spacer ring [0104] 23 plug [0105] 24 plug [0106] 25 shaft nut [0107] 26 plug [0108] 27 first annular space [0109] 28 second annular space [0110] 100 oil flow required by bearing [0111] 101 oil sump for shaft sealing ring [0112] 102 oil sump for start-up lubrication