Gearbox comprising a housing
Patent Information
- Application Number
- EP2023731091
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-06-27
- Filing Date
- 2023-05-31
- Publication Date
- 2025-04-30
AI Technical Summary
Existing gearbox designs face challenges in efficiently supplying lubricating oil to bearings, particularly in ensuring consistent lubrication without the need for specialized oil lines, while minimizing oil loss and maximizing oil utilization.
The gearbox housing features a cascading plateau system with storage edges that collect and redirect lubricating oil to bearings, allowing for oil accumulation and distribution without requiring dedicated oil lines, with an oil pump providing active supply to upper part bearings and utilizing a sump for lower part bearings, ensuring efficient lubrication.
This solution ensures effective lubrication of all bearings within the gearbox, reducing oil loss and installation complexity, while allowing for flat or slightly inclined plateaus that maintain efficient oil distribution and heat transfer, accommodating varying oil demands based on bearing size.
Smart Images
Figure 1.1
Abstract
Description
[0001] Gearbox with a housing
[0002] Description:
[0003] The invention relates to a transmission with a housing.
[0004] It is generally known that a gearbox has shafts that are rotatably mounted by means of bearings.
[0005] From US 2021 / 0 071 727 A1, a machine brake is known as the closest state of the art.
[0006] A gearbox is known from US 2021 / 0 041 017 A1.
[0007] DE 10 2021 002 929 A1 describes a gearbox with a housing, which has a lower part and a cover part.
[0008] A system with a lubricating oil circuit is known from DE 10 2018 203 696 A1.
[0009] A lubricating device for centrifugal machines is known from DE 597 396 A.
[0010] A lubrication device for a multi-stage transmission is known from EP 1 010 923 A2.
[0011] A parallel shaft gear is known from CN 1 01 799 069 A1.
[0012] The invention is therefore based on the object of further developing a supply of lubricating oil to the bearings of a gearbox.
[0013] According to the invention, the object is achieved in the transmission according to the features specified in claim 1. Important features of the invention in the transmission are that the transmission is provided with a
[0014] Housing is formed which has a lower part and an upper part connected to the lower part, wherein bearing receptacles, in particular designed as through-bores, in particular for bearings of shafts of the transmission, are formed in the upper part, wherein the lower part has an intermediate wall in which bearing receptacles, in particular designed as through-bores, in particular for bearings of shafts of the transmission, are formed, wherein the intermediate wall has plateaus (8, 9, 10), wherein a respective one of the bearing receptacles is arranged and / or introduced in a respective one of the plateaus, wherein the plateaus are delimited and / or spaced from one another by retaining edges (5, 6, 7) which in each case rise up and / or protrude towards the upper part, in particular from the respective plateau towards the upper part.
[0015] The advantage here is that the oil dripping down or flowing along the inner walls is collected in the plateaus and directed to the bearings. This even allows the oil to accumulate on the plateau, making the inclination of the plateau negligible. In particular, the plateau can even be designed to be level, particularly horizontally aligned and level. Nevertheless, the oil is directed to the bearings, thus ensuring the lubrication supply. An oil pump supplies the bearings housed in the upper section. The bearings housed in the lower section do not require a special oil line; it is sufficient for the oil flowing down or dripping down to be directed to the respective plateau and then supplies the respective bearing.
[0016] It is important in the invention that the housing has cascade-like arranged plateaus which function as oil reservoirs and have descending heights, in particular with descending distances from the upper part, which have retaining edges which function as overflow edges and each have at least one respective bearing receptacle, in particular for a respective one of the shafts rotatably mounted by means of bearings received in the bearing receptacles of the upper part, in particular wherein the axes of rotation of the shafts rotatably mounted by means of the bearing receptacles and bearings received therein are aligned parallel to one another and are aligned parallel to the direction of the normal to the contact plane.
[0017] The advantage here is that the oil dripping down or flowing along the inner walls is collected in the plateaus and directed to the bearings. This even allows the oil to accumulate on the plateau, making the inclination of the plateau negligible. In particular, the plateau can even be designed to be level, particularly horizontally aligned and level. Nevertheless, the oil is directed to the bearings, thus ensuring the lubrication supply. An oil pump supplies the bearings housed in the upper section. The bearings housed in the lower section do not require a special oil line; it is sufficient for the oil flowing down or dripping down to be directed to the respective plateau and then supplies the respective bearing.
[0018] In an advantageous embodiment, the plateaus are inclined toward the bearing receptacle arranged in the respective plateau, in particular at an inclination angle of less than 5°. This is advantageous in that the oil can flow toward the bearing receptacle, thus making the bearing receptacle the lowest area of the plateau. However, according to the invention, retaining edges are provided that allow the oil to accumulate and thus ensure oil supply to the bearings accommodated in the bearing receptacles.
[0019] In an advantageous embodiment, each of the plateaus is aligned parallel to the housing's split plane, particularly disregarding the plateau's inclination relative to the split plane, i.e., in particular, parallel to the contact plane between the upper and lower sections. The advantage here is that the retaining edges allow the oil to accumulate, thus ensuring the oil supply to the bearings.
[0020] In an advantageous embodiment, the plateaus are at different distances from the split plane. This is advantageous in that a first plateau, located closest to the split plane, can supply another plateau with oil accumulated and overflowing in the first plateau. Since the first plateau has a smaller bearing than the other plateau, the corresponding bearing requires more oil than the smaller bearing. The same applies to the third and / or subsequent bearings.
[0021] In an advantageous design, each plateau has a bore through the intermediate wall. This is advantageous because the oil flowing through the bearing then reaches the oil sump.
[0022] In an advantageous embodiment, an annular dam rim protruding from the respective plateau toward the upper part demarcates the respective bore from the respective plateau. This is advantageous in that a maximum oil level is achieved when the oil accumulates. Preferably, the annular dam rim protrudes further from the plateau toward the split level than the dam rim of the plateau.
[0023] In an advantageous embodiment, each plateau is located at a greater distance from the split plane than the plateau immediately adjacent to it. This is advantageous because each plateau can supply the next plateau.
[0024] In an advantageous embodiment, an oil sump for the transmission is arranged on the side of the partition wall facing away from the upper part. This advantageously allows the oil flowing through the bearings housed in the bearing receptacles of the partition wall to drain into the oil sump or collect there, making it available to the intake area of the oil pump.
[0025] In an advantageous embodiment, an oil pump of the transmission pumps oil, in particular from the oil sump, to the bearings housed in the bearing receptacles of the upper part, in particular so that this oil drips from the bearings housed in the bearing receptacles of the upper part to the respective plateaus. This advantageously ensures an active oil supply, particularly for the bearings housed in the upper part.
[0026] In an advantageous embodiment, the intermediate wall is the outer wall of the gearbox.
[0027] The advantage here is that the plateaus can also be formed on the inside of an outer wall of the transmission housing. However, this requires the bearings housed in the outer wall to be covered from the outside by bearing caps mounted on the outer wall. The oil must be drained from the areas covered by the bearing caps into the oil sump, particularly through appropriate channels arranged and / or integrated in the transmission housing or external pipes, which, however, require additional installation space.
[0028] In an advantageous design, each plateau is convexly curved. This is advantageous because the oil flows toward the bearing housing, especially when only a small amount of oil has entered the plateau.
[0029] In an advantageous design, no tangential plane of the plateau is inclined by more than 5° to the split plane of the housing. This is advantageous because the residual curvature of the plateaus, especially the convex ones, is less than 5°, preventing the oil from flowing away too quickly and allowing its heat to be efficiently transferred to the partition wall.
[0030] In an advantageous embodiment, the rotational symmetry axes of the bearing mounts, in particular the rotational axes of the shafts rotatably mounted by means of the bearings housed in the bearing mounts, are aligned vertically and / or perpendicular to the split plane. This advantageously allows the oil pumped to the upper part by the oil pump to also reach the bearings housed in the lower part.
[0031] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art. The invention will now be explained in more detail with reference to schematic illustrations:
[0032] Figure 1 shows a cut-away gearbox housing in a first viewing direction in an oblique view, with the cutting plane aligned parallel to the split plane of the gearbox housing.
[0033] In Figure 2, the cut-away gearbox housing is shown in a second oblique view.
[0034] As shown in the figures, the gear housing has a lower part 1, onto which an upper part 15, which functions in particular as a cover for the lower part 1, is placed, in particular and is connected by means of screws.
[0035] The gear shafts are rotatably mounted by means of bearings accommodated in bearing receptacles (11, 12, 13, 14) of the lower part 1 and the upper part 15. Geared parts are connected to the shafts in a rotationally fixed manner and mesh with each other.
[0036] In Figures 1 and 2, the section plane bisects bearing receptacles (11, 12, 13, 14) which contain the axes of rotation of the shafts rotatably supported by means of the bearings accommodated in the bearing receptacles (11, 12, 13, 14).
[0037] An oil pump is provided for lubrication of the bearings, which supplies the bearings accommodated in bearing receptacles of the upper part 15 with oil pumped by the oil pump, which then drips down to the lower part 1 or flows down the inner wall of the upper part 15.
[0038] The bearing supports (11, 12, 13, 14) of the lower part 1 are incorporated in an intermediate wall which has its longest extension essentially parallel to the split plane, i.e. to the contact plane between the lower part 1 and the upper part 15.
[0039] The gearbox's oil sump, from which the oil pump delivers oil, is located on the side of the partition wall facing away from the upper part 15. To supply the bearings housed in the bearing mounts (11, 12, 13, 14), the bearing mounts (11, 12, 13, 14) are formed as bores in a respective plateau (8, 9, 10) and extend through the partition wall.
[0040] A first plateau 8 of these plateaus (8, 9, 10) is arranged closer to the split plane than a second plateau 9, which in turn is preferably arranged closer to the split plane than a third plateau 10.
[0041] A first bearing receptacle 11 is inserted in the first plateau 8, a second bearing receptacle 12 is inserted in the second plateau 9 and a third bearing receptacle 13 is inserted in the third plateau 10.
[0042] The plateaus (8, 9, 10) are aligned essentially parallel to the split plane, preferably sloping slightly toward the bore formed in them, which serves as the respective bearing receptacle (11, 12, 13). In particular, the angle of inclination to the split plane is always less than 5°.
[0043] The first plateau 8 is delimited from the second plateau 9 by a retaining edge 5, in particular a raised portion, wherein the retaining edge 5 rises toward the upper part 15. In particular, a step is formed on the side of the retaining edge 5 facing the second plateau 9.
[0044] The second plateau 9 is delimited from the third plateau 10 by a retaining edge 6, in particular a raised portion, wherein the retaining edge 6 rises toward the upper part 15. In particular, a step is formed on the side of the retaining edge 6 facing the third plateau 10.
[0045] The third plateau 10 also has a storage edge 7 for the fourth storage receptacle 14.
[0046] The limitation of the oil collected in the first plateau is achieved by the side walls of the lower part and the retaining edge 5. The oil reaches the first plateau 8 by dripping and / or falling and / or flowing down the inner walls of the lower part 1. Only that portion of the oil which overflows and / or spills over the first retaining edge 5 reaches the second plateau 9. The limitation of the oil collected in the second plateau 9 is also achieved by the
[0047] Side walls of the lower part and the storage edge 6 as well as the step arranged on the first storage edge 5.
[0048] The limitation of the oil collected in the third plateau 10 is further achieved by the side walls of the lower part and the retention edge 7 as well as the step arranged on the first retention edge 6.
[0049] In addition, a recess (2, 3, 4) passing through the intermediate wall is arranged in each of the plateaus (8, 9, 10).
[0050] Around the edge of each of these holes (2, 3, 4) there is formed an annular retaining edge projecting towards the upper part 15 so that the oil of the respective plateau (8, 9, 10) does not flow through these holes (2, 3, 4).
[0051] In particular, these ring-shaped and / or the dam edges protrude from the respective plateau (8, 9, 10).
[0052] Thus, oil not only reaches the oil sump through the bearings, but also through the holes (2, 3, 4).
[0053] Preferably, the split plane is aligned horizontally and / or the axes of rotation of the shafts supported by the bearings accommodated in the bearing receptacles (11, 12, 13, 14) are aligned vertically.
[0054] According to the invention, oil flows from the plateau assigned to the smaller bearing to the plateau assigned to the next larger bearing.
[0055] The first bearing receptacle 11 has a smaller clear inner diameter than the second bearing receptacle 12. In particular, the second bearing receptacle 12 is the next adjacent bearing receptacle to the first bearing receptacle 11. The second bearing receptacle 12 has a smaller clear inner diameter than the third bearing receptacle 13, which is adjacent to the second bearing receptacle 12.
[0056] The third bearing receptacle 13 has a smaller clear inner diameter than the fourth bearing receptacle 14, which is adjacent to the third bearing receptacle 13.
[0057] In further embodiments of the invention, the intermediate wall is designed as the outer wall of the transmission, and thus the inventive supply of oil to the bearings is carried out via the differently high plates on the outer wall. However, the bores (2, 3, 4) and their retaining edges are omitted, and the oil pump is supplied from the oil sump formed around the fourth bearing support 14.
[0058] List of reference symbols
[0059] I Lower part 2 continuous recess, in particular bore
[0060] 3 continuous recess, in particular bore
[0061] 4 continuous recess, in particular bore
[0062] 5 Dam edge, especially elevation
[0063] 6 Dam edge, especially elevation 7 Dam edge, especially elevation
[0064] 8 first plateau
[0065] 9 second plateau
[0066] 10 third plateau
[0067] II first bearing 12 second bearing
[0068] 13 third camp recording
[0069] 14 fourth stock recording
[0070] 15 Top
Claims
Patent claims:
1. A transmission with a housing having a lower part and an upper part connected to the lower part, wherein bearing receptacles, in particular designed as through bores, in particular for bearings of shafts of the transmission, are formed in the upper part, characterized in that the housing has cascade-like arranged plateaus (8, 9, 10) acting as oil reservoirs with decreasing height, in particular with decreasing distance from the upper part, which have retaining edges (5, 6, 7) acting as overflow edges and each have at least one respective bearing receptacle, in particular for a respective one of the shafts rotatably mounted by means of bearings received in the bearing receptacles of the upper part, in particular wherein the axes of rotation of the shafts rotatably mounted by means of the bearing receptacles and the bearings received therein are aligned parallel to one another and are aligned parallel to the direction of the normal to the contact plane,and / or that the lower part has an intermediate wall in which bearing receptacles, in particular designed as through bores, in particular for bearings of shafts of the transmission, are formed, wherein the intermediate wall has plateaus (8, 9, 10), in particular which each have a different distance from the upper part or from the contact plane between the upper part and the lower part, in particular from the split plane and / or separation plane of the housing, wherein a respective one of the bearing receptacles is arranged and / or introduced into a respective one of the plateaus, wherein the plateaus are delimited and / or spaced apart from one another by retaining edges (5, 6, 7) which in particular rise and / or project from the respective plateau towards the upper part, in particular overflow edges, in particular wherein the axes of rotation of the shafts rotatably mounted by means of the bearing receptacles and bearings received therein are aligned parallel to one another and are aligned parallel to the direction of the normal to the contact plane.
2. Gearbox according to claim 1, characterized in that the plateaus are inclined towards the bearing receptacle arranged in the respective plateau, in particular with an angle of inclination of less than 5°, and / or that the normal direction of the plateaus to the axis of rotation of the shafts rotatably mounted by means of the bearings accommodated in the bearing receptacles each has an angle of inclination of less than 5°, in particular wherein each of the plateaus is aligned parallel to the contact plane and / or split plane of the housing, neglecting the inclination, in particular is aligned parallel to the contact plane between the upper part and lower part.
3. Gearbox according to claim 1, characterized in that each of the plateaus is aligned parallel to the contact plane and / or split plane of the housing, in particular parallel to the contact plane between the upper part and the lower part.
4. Transmission according to claim 1, characterized in that each plateau is convexly curved.
5. Transmission according to claim 4, characterized in that no tangential plane of the plateau is inclined by more than 5° to the split plane of the housing.
6. Transmission according to one of the preceding claims, characterized in that the plateaus have different distances from the contact plane and / or split plane.
7. Transmission according to one of the preceding claims, characterized in that a respective bore passing through the intermediate wall is introduced into each plateau.
8. Gearbox according to one of the preceding claims, characterized in that an annular retaining edge projecting from the respective plateau towards the upper part delimits the respective bore from the respective plateau.
9. Transmission according to one of the preceding claims, characterized in that a respective plateau has a greater distance from the contact plane and / or split plane than a plateau next adjacent to the respective plateau.
10. Transmission according to one of the preceding claims, characterized in that an oil sump of the transmission is arranged on the side of the intermediate wall facing away from the upper part.
11. Transmission according to one of the preceding claims, characterized in that an oil pump of the transmission conveys oil, in particular from the oil sump, to bearings accommodated in the bearing receptacles of the upper part, in particular in such a way that this oil drips down from the bearings accommodated in the bearing receptacles of the upper part to respective plateaus.
12. Transmission according to one of the preceding claims, characterized in that Partition wall is the outer wall of the gearbox.
13. Gearbox according to one of the preceding claims, characterized in that the rotational symmetry axes of the bearing receptacles, in particular the rotational axes of the shafts rotatably mounted by means of the bearings accommodated in the bearing receptacles, are aligned vertically and / or are aligned perpendicular to the split plane.