Planetary gear train with rotating housing part and stationarily arranged planet carrier

Abstract

Planetary gear train with a rotating housing part and a stationarily arranged planet carrier, wherein transport chambers are arranged on the inner side of the housing part, wherein the transport chambers are configured to be open toward the planet carrier and / or the transport chambers are configured to be open radially inward, wherein the planet carrier has a first radially continuous opening at a first circumferential location, wherein the planet carrier has a second radially continuous opening at a second circumferential location.

Description

[0001] Planetary gear unit with rotating housing part and stationary planet carrier

[0002] Description:

[0003] The invention relates to a planetary gear with a rotating housing part and a stationary planet carrier.

[0004] It is generally known that the lubrication of meshing gear parts of a gearbox partially filled with lubricating oil can be carried out by means of an electrically driven oil pump or a passively driven shaft end pump.

[0005] A performance system is known from US 2018 / 0328480 A1.

[0006] A planetary gear is known from US 2016 / 0208905 A1.

[0007] From DE 102017127521 A1 a passive lubrication system for concentric gear drive for an electric vehicle is known.

[0008] An oil supply structure is known from JP 2020 - 159366 A.

[0009] The invention is therefore based on the objective of achieving an improvement in the lubrication of components or areas to be supplied with lubricating oil, particularly in a pumpless gearbox.

[0010] According to the invention, the problem is solved in the planetary gear according to the features specified in claim 1.

[0011] Important features of the invention for the planetary gear with rotating housing part and stationary planet carrier are that

[0012] Transport chambers are arranged on the inside of the housing part,

[0013] ISI \ EIDOPAT 29.01.2026, wherein the transport chambers are open towards the planet carrier and / or the transport chambers are open radially inwards,

[0014] wherein the planet carrier has a first radially through-hole at a first circumferential point, in particular in a first circumferential angle region, in particular such that lubricating oil flows or can flow through the hole into a transport chamber,

[0015] wherein the planet carrier has a second radially through-hole at a second circumferential location, in particular in a second circumferential angle region, in particular such that lubricating oil from a transport chamber flows or can flow through the hole,

[0016] in particular, wherein the first circumferential point is spaced apart from the second circumferential point in the circumferential direction.

[0017] An advantage of this design is the improved lubrication of a planetary gear unit partially filled with lubricating oil. According to the invention, the housing component itself acts as a pumping device for lubricating oil, conveying it from the oil sump of the planetary gear unit upwards until the upwardly conveyed lubricating oil flows through the first circumferential point into the annular groove area of ​​the planet carrier. From there, it flows through a channel structure of the planet carrier and planet pin to the bearings of the planet gears, which are located above the oil sump.

[0018] The term "planetary bolt" here also refers more generally to and / or encompasses the term "planetary axis".

[0019] The lubricating oil flows through the recesses of the planet carrier into a respective transport chamber or out of the transport chamber through the planet carrier and through the planet bolt to the bearing of the respective planet gear.

[0020] In an advantageous embodiment, the transport chambers are spaced apart from each other in the circumferential direction. It is advantageous that the transport chambers are separated from their respective circumferentially adjacent transport chambers by means of a partition. The partition is formed integrally with the housing part and / or as a single piece. The transport chambers are thus each formed as a radially outwardly directed recess on the radial inner side of the housing part. The partitions are preferably less extensive in the circumferential direction, in particular ten times less, than the respective transport chamber.

[0021] In an advantageous embodiment, radially inward-projecting partitions are arranged on the inside of the housing part between the nearest adjacent transport chambers in the circumferential direction. The advantage here is that the partitions prevent the lubricating oil contained in the transport chamber from flowing out.

[0022] The partitions thus limit the lubricating oil received in the respective transport chamber in the circumferential direction. The limitation in the radial direction, especially radially inwards, is effected by the planet carrier, which, although an annular gap exists between the planet carrier and the housing part, limits the lubricating oil received in the respective transport chamber radially inwards by its outer surface, designed as a cylindrical circumferential surface.

[0023] In an advantageous embodiment, the input shaft of the planetary gear is rotatably mounted, in particular by means of a bearing inserted into a recess in the planet carrier, specifically the inner ring of which is fitted onto the input shaft and the outer ring of which is inserted into the recess in the planet carrier. An advantage of this design is that the planetary gear can be made very compact. Alternatively, the input shaft can also be rotatably mounted by fitting the inner ring of the bearing onto the input shaft and the outer ring being received in the housing part.The driving shaft does not have to be directly connected to the sun gear, but can also extend axially through the planet carrier and be non-rotatably connected to a second sun gear of a second planetary gear stage, which is in engagement with second planet gears of the second planetary gear stage, which are rotatably mounted on planet bolts of a second planet carrier of the second planetary gear stage, wherein this second planet carrier is non-rotatably connected to the sun gear of the planetary gear.

[0024] In an advantageous embodiment, all transport chambers cover the same area in the axial direction. This is advantageous because it allows for simple manufacturing and prevents imbalance of the housing component.

[0025] In an advantageous embodiment, all transport chambers cover the same area in the radial direction, in particular the radial spacing area relative to the axis of rotation of the driving shaft. This is advantageous because it enables simple manufacturing and prevents imbalance of the housing part. In another advantageous embodiment, the planet carrier is arranged radially between the driving shaft and the housing part. An advantage here is that the planet carrier can be arranged in a stationary position, i.e., it can be detachably or permanently connected to a machine part or system component in the vicinity of the planetary gear. Thus, the planet carrier does not rotate during operation of the planetary gear, but remains in its position and in an unchanged spatial orientation. In contrast, the housing part rotates around the planet carrier, and the planet gears perform a purely rotary motion around the planet pins.

[0026] In an advantageous embodiment, the planet carrier has an annular groove area on its end face, which opens into the second radially through-hole. It is advantageous that the lubricating oil received in one of the transport chambers flows through the second recess into the annular groove area of ​​the planet carrier and from there reaches the bearings of the planet gears via a channel structure.

[0027] In an advantageous embodiment, the ring axis of the annular groove area is coaxially aligned with the axis of rotation of the driving shaft. This is advantageous because the annular groove area allows lubricating oil to be supplied to those planet gear bearings located above the oil sump, which are therefore not supplied with lubricating oil when the planetary gear is stationary, and thus are insufficiently lubricated. As soon as the planetary gear is operated, the transport of lubricating oil begins via the rotating transport chambers.

[0028] In an advantageous embodiment, the annular groove area is covered by a sheet metal part which is attached to the end face of the planet carrier, in particular by means of fastening screws screwed into threaded holes in the planet carrier. An advantage of this is that a channel for lubricating oil can be produced without special effort.

[0029] In an advantageous embodiment, a channel structure opens into the annular groove area, from which a bearing, in particular a needle bearing, of a planetary gear of the planetary transmission can be supplied with lubricating oil. It is advantageous that the lubricating oil conveyed upwards from the transport chambers can be conveyed directly to the bearings.

[0030] In an advantageous embodiment, a channel structure opens into the annular groove area, from which at least two bearings, in particular needle bearings, can be supplied with lubricating oil for the rotatable mounting of planetary gears of the planetary gearbox. It is advantageous that the lubricating oil can be conveyed directly to the bearings via the channel structure.

[0031] In an advantageous embodiment, an axial bore, in particular of the channel structure, introduced into the planet carrier leads into the annular groove area,

[0032] wherein a radial bore, in particular a channel structure, is incorporated into the planet carrier and opens into the axial bore and into a radial bore in a planetary bolt, which in turn opens via an axial bore in the planetary bolt into a further radial bore in the planetary bolt, from which a bearing, in particular a needle bearing, for the rotatable mounting of a planetary gear can be supplied with lubricating oil. An advantage of this is that the channel structure is simple and inexpensive to manufacture.

[0033] In an advantageous embodiment, those transport chambers which are located circumferentially outside the area covered by the first circumferential point and outside the area covered by the second circumferential point are covered by the planet carrier.

[0034] where there is an annular gap between the housing part and the planet carrier,

[0035] In particular, wherein the radial gap width of the annular gap is less than one hundredth of the largest radial dimension of the transport chambers and / or less than one millimeter and / or wherein the maximum radial dimension of the transport chambers is at least ten times greater than the largest radial distance of the transport chambers relative to the axis of rotation of the driving shaft. It is advantageous that the planet carrier has a cylindrical outer circumference that covers the transport chambers.

[0036] In an advantageous embodiment, the area covered by the annular groove in the circumferential direction contains the axis of rotation of one planet gear or the axes of rotation of two planet edges and / or is less than 100° or less than 130°. It is advantageous that the annular groove contains the axes of rotation of two or more planet gears or that the annular groove contains the axes of rotation of half the total number of planet gears.

[0037] In an advantageous embodiment, an annular collar projects axially from the end face of the planet carrier, into which the annular groove is integrated. It is advantageous that the annular collar is formed as a single piece on the planet carrier. This integration eliminates the need for seals.

[0038] In an advantageous embodiment, the radially outer surface of the planet carrier in the area covered by the transport chambers in the axial direction, with the exception of the first and second circumferential points, is a cylindrical surface which, in particular, has a constant and / or identical outer radius. It is advantageous that the planet carrier seals the transport chambers.

[0039] Further advantages arise from the dependent claims. The invention is not limited to the combination of features in the claims. For the person skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will be apparent.

[0040] in particular from the problem statement and / or the problem arising from a comparison with the state of the art. The invention will now be explained in more detail with reference to a schematic diagram:

[0041] Figure 1 shows a gear unit according to the invention, in particular a planetary gear unit, in an oblique view.

[0042] Figure 2 shows the gearbox in a side view, with one area cut off.

[0043] Figure 3 shows an enlarged view of the area.

[0044] Figure 4 shows a cross-section through the gearbox.

[0045] Figure 5 shows a longitudinal section through a second area of ​​the transmission comprising a planet gear 13.

[0046] Figure 6 shows another sectional view of the gearbox.

[0047] Figure 7 shows the gearbox, open at its front, in an oblique view.

[0048] As shown in the figures, the gearbox has a planet carrier 2 which is attached to a machine part or system component and is therefore stationary rather than rotating. In contrast, the gearbox housing part 1 is rotatably arranged, in particular relative to the planet carrier 2.

[0049] A sun gear 15 is non-rotatably connected to the driving shaft 9 and is in engagement with planet gears 13, which are in furthermore in engagement with an internal toothing which is incorporated in a housing part 1 of the gearbox or in a ring gear which is inserted into the housing part 1 of the gearbox and is non-rotatably connected.

[0050] The housing part 1 has transport chambers 3 on its inner side, which are open towards the planet carrier 2 and are separated from each other in the circumferential direction.

[0051] The planet carrier 2 has an inlet opening 4 at a first location, in particular on its underside, through which oil passes and is thus admitted into the rotating transport chamber 3 below. This transport chamber 3, containing the lubricating oil, is then rotated circumferentially until a second location, in particular on its top side, is reached. At this second location, the planet carrier 2 has an outlet opening 5 through which the lubricating oil flows from the transport chamber 3 into an annular groove 6. This groove is axially bounded, particularly in relation to the surroundings of the planet carrier 2, by a sheet metal part 7 and extends circumferentially. A channel structure 14 formed in the planet carrier 2 opens into the annular groove 6, allowing the lubricating oil to flow from the annular groove 6 into the channel structure.

[0052] This channel structure consists of an axial bore section which opens into a radial bore section of the planet carrier 2, and also extends through a planet pin 11, in particular up to the bearings 12, in particular needle bearings, of the planet gears 13 which are rotatably mounted on the planet pin 11 via the bearings 12, in particular needle bearings. Thus, these bearings 12 are supplied with lubricating oil via the transport chambers 3 formed on the housing part 1 and the channel structure of the planet carrier 2 and the planet pins 11.

[0053] The planetary bolts 11 are either plug-in connected to the planetary carrier 2 or formed as a single unit with it. Thus, the planetary bolts 11 are also arranged in a stationary position.

[0054] The lubricating oil exiting the bearings 12 flows downwards inside the planetary gear and thus reaches the inlet opening 4, from where the lubricating oil flows into a rotating transport chamber 3.

[0055] Preferably, the transport chambers 3 are shaped identically to each other, so that they differ from each other only in the circumferential angle position.

[0056] The transport chambers 3 therefore all have the same axial position and the same radial distance to the axis of rotation of the driving shaft 9.

[0057] The radial direction is always referenced to the axis of rotation of the driving shaft 9. The axial direction is parallel to the axis of rotation of the driving shaft 9, and the circumferential direction is also referenced to the axis of rotation of the driving shaft 9. The inlet opening 4 and the outlet opening 5 each extend radially through the planet carrier 2. The respective transport chamber 3 extends further circumferentially than both the inlet opening 4 and the outlet opening 5.

[0058] In the figures, the respective local flow direction of the lubricating oil is indicated and shown with the reference symbol 8.

[0059] The driving shaft 9 is supported by a bearing 16. Preferably, the outer ring of the bearing 16 is inserted into a recess of the planet carrier 2. Alternatively, the outer ring of the bearing 16 is inserted into a bearing receptacle formed in the housing part 1.

[0060] In further embodiments of the invention, the sun gear 15 is provided with a toothed section which engages with the planet gears 13 and with a splined connection by which the sun gear 15 is inserted into a recess of the driving shaft 9 and positively connected to the driving shaft 9. Reference numeral list

[0061] 1 Housing part, in particular rotating housing part

[0062] 2 Planetary carriers, in particular stationary planetary carriers 3 Transport chamber

[0063] 4 Inlet opening

[0064] 5 Outlet opening

[0065] 6 Ring groove area

[0066] 7 sheet metal part

[0067] 8 Flow direction

[0068] 9 driving wave

[0069] 10 cooling fins

[0070] 11 planetary bolts

[0071] 12 bearings, especially needle bearings

[0072] 13 planetary gear

[0073] 14 Channel structure

[0074] 15 sun wheel

[0075] 16 warehouses

Claims

Patent claims:

1. Planetary gear with rotating housing part (1) and stationary planet carrier (2), characterized by the fact that Transport chambers (3) are arranged on the inside of the housing part (1), wherein the transport chambers (3) are open towards the planet carrier (2) and / or the transport chambers (3) are open radially inwards, wherein the planet carrier (2) has a first radially through-hole at a first circumferential point, in particular in a first circumferential angle region, in particular such that lubricating oil flows or can flow through the hole into a transport chamber (3), wherein the planet carrier (2) has a second radially through-hole at a second circumferential location, in particular in a second circumferential angle region, in particular such that lubricating oil from a transport chamber (3) flows or can flow through the hole, 2. Planetary gear according to claim 1, in particular wherein the first circumferential point is spaced apart from the second circumferential point in the circumferential direction. characterized by the fact that the transport chambers (3) are spaced apart from each other in the circumferential direction, and / or In the circumferential direction, partition walls projecting radially inwards between the nearest adjacent transport chambers (3) are arranged on the inside of the housing part (1).

3. Planetary gear set according to any of the preceding claims, characterized by the fact that a driving shaft (9) of the planetary gear is rotatably mounted, in particular via a bearing (12) inserted into a recess of the planet carrier (2), in particular its inner ring being mounted on the driving shaft (9) and its outer ring being inserted into the recess of the planet carrier (2). or that a driving shaft (9) of the planetary gear is rotatably mounted, in particular via a bearing (12) inserted into a bearing receptacle of the housing part (1), in particular its inner ring being mounted on the driving shaft (9) and its outer ring being inserted into the bearing receptacle of the housing part (1).

4. Planetary gear according to any of the preceding claims, characterized by the fact that all transport chambers (3) cover the same area in the axial direction.

5. Planetary gear set according to any of the preceding claims, characterized by the fact that All transport chambers (3) cover the same area in the radial direction, in particular the radial spacing area with respect to the axis of rotation of the driving shaft (9).

6. Planetary gear according to one of the preceding claims, characterized by the fact that the planet carrier (2) is arranged radially between the driving shaft (9) and the housing part (1).

7. Planetary gear set according to any of the preceding claims, characterized by the fact that The planet carrier (2) has an annular groove area (6) on its end face, which opens into the second radially continuous recess.

8. Planetary gear set according to any of the preceding claims, characterized by the fact that the ring axis of the ring groove area (6) is coaxially aligned with the axis of rotation of the driving shaft (9).

9. Planetary gear according to any of the preceding claims, characterized by the fact that the ring groove area (6) is covered by means of a sheet metal part (7) which is attached to the front face of the planet carrier (2), in particular by means of fastening screws screwed into threaded holes of the planet carrier (2).

10. Planetary gear set according to any of the preceding claims, characterized by the fact that a channel structure (14) opens into the ring groove area (6), from which a bearing (12), in particular a needle bearing, of a planet gear (13) of the planetary gear can be supplied with lubricating oil, or that a channel structure (14) opens into the annular groove area (6), from which at least two bearings (12), in particular needle bearings, can be supplied with lubricating oil for the rotatable mounting of planet gears of the planetary gear set.

11. Planetary gear set according to one of the preceding claims, characterized by the fact that an axial bore, in particular of the channel structure (14), provided in the planet carrier (2) opens into the annular groove area (6), wherein a radial bore, in particular of the channel structure (14), provided in the planet carrier (2) opens into the axial bore and into a radial bore provided in a planet bolt (11), which opens via an axial bore provided in the planet bolt (11) into a further radial bore provided in the planet bolt (11), alternatively a bearing (12), in particular needle bearing, for rotatable support of a planet gear (13) can be supplied with lubricating oil.

12. Planetary gear set according to any of the preceding claims, characterized by the fact that those transport chambers (3) which are located circumferentially outside the area covered by the first circumferential point and outside the area covered by the second circumferential point, are covered by the planet carrier (2), wherein an annular gap exists between the housing part (1) and the planet carrier (2), in particular wherein the radial gap width of the annular gap is less than one hundredth of the largest radial extent of the transport chambers (3) and / or less than one millimeter and / or wherein the maximum radial extent of the transport chambers (3) is at least ten times greater than the largest radial distance of the transport chambers (3) relative to the axis of rotation of the driving shaft (9).

13. Planetary gear set according to any of the preceding claims, characterized by the fact that The area covered in the circumferential direction by the annular groove area (6) contains the axis of rotation of a planet gear (13) or the axes of rotation of two planetary edges and / or is less than 100° or less than 130°.

14. Planetary gear according to one of the preceding claims, characterized by the fact that A ring collar protrudes axially from the front face of the planet carrier (2), into which the ring groove area (6) is inserted.

15. Planetary gear set according to any of the preceding claims, characterized by the fact that In the area covered in the axial direction by the transport chambers (3), the radially outer surface of the planet carrier (2), with the exception of the first and second circumferential points, is a cylindrical surface, in particular having a constant and / or identical outer radius.

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