Transmission assembly having a transmission
The gear arrangement integrates airflow guidance within the gearbox by using a housing design with a hollow shaft and bearings, addressing the limitations of existing gearboxes by enhancing functionality without increasing size.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SEW EURODRIVE GMBH & CO KG
- Filing Date
- 2025-11-13
- Publication Date
- 2026-07-02
AI Technical Summary
Existing gearboxes are limited in functionality and require additional space for performing functions beyond torque transmission.
A gear arrangement with a gear unit featuring a housing composed of a lower housing part and a cover part, incorporating bearings and a hollow shaft, which also serves as an air guide, allowing airflow through the gearbox without additional installation space.
The gearbox is made multifunctional by guiding airflow, enhancing its performance while maintaining compactness and ensuring efficient torque transmission.
Smart Images
Figure EP2025082982_02072026_PF_FP_ABST
Abstract
Description
[0001] Gear arrangement with a gearbox
[0002] Description:
[0003] The invention relates to a gear arrangement with a gear unit.
[0004] It is generally known that a gearbox is designed with an input shaft and an output shaft, wherein the output shaft is rotatably mounted on bearings housed in the casing.
[0005] A drive is known from DE 102014012880 A1.
[0006] The invention is therefore based on the objective of further developing the gearbox in a compact and multifunctional manner, in particular not only for torque transmission, but also for the performance of other functions.
[0007] According to the invention, the problem is solved in the gear arrangement according to the features specified in claim 1.
[0008] Important features of the invention in the gear arrangement with a gear unit are that the gear unit has a housing formed from a lower housing part and a cover part placed on the lower housing part,
[0009] wherein a first bearing of an output shaft is accommodated in the lower part of the housing, in particular in a bushing-shaped or cup-shaped thickening of the lower part of the housing,
[0010] where a second bearing is incorporated in the lid part,
[0011] wherein the second bearing is axially limited by a bearing cover connected to the cover part,
[0012] the shaft is designed as a hollow shaft,
[0013] ISI \ EIDOPAT 13.11.2025, wherein an adapter ring is connected to the bearing cap on the side of the bearing cap facing away from the second bearing,
[0014] wherein a flange ring is connected to the adapter ring on the side of the adapter ring facing away from the second bearing,
[0015] where an air supply pipe can be connected to the flange ring.
[0016] An advantage of this design is that the gearbox not only transmits torque but also performs another function: guiding an airflow through the gearbox, particularly the output shaft. The output shaft thus also acts as an air guide. This makes the gearbox multifunctional. No significant additional installation space is required for this.
[0017] In an advantageous embodiment, the flange ring has an annular projection whose outer diameter is larger than the clear inner diameter of the driving shaft. It is advantageous that the air supply pipe can be slipped onto the projection and pressed firmly against it, particularly by means of a shrink ring, thus creating an airtight and / or pressure-tight connection between the air supply pipe and the flange ring.
[0018] In an advantageous embodiment, the outer diameter of the flange ring is larger than the outer diameter of the bearing cap. This design offers the advantage of allowing the connection of an air inlet tube that is significantly larger than the hollow shaft, or at least larger than the internal diameter of the hollow shaft. Furthermore, when a shrink ring is fitted, sufficient sealing, and thus a sufficiently high degree of protection, can be achieved with minimal force.
[0019] In a preferred embodiment, the outer diameter of the adapter ring is larger than the outer diameter of the bearing cap. The advantage here is that the flange ring connected to the adapter ring can have an equally large diameter, thus allowing the connection of a correspondingly large air inlet pipe.
[0020] In an advantageous embodiment, a shaft seal is incorporated in the bearing cap, which seals against the driven shaft. An advantage of this is that the gearbox interior is sealed from the environment. In another advantageous embodiment, a shaft seal is incorporated in the adapter ring, which seals against the driven shaft. An advantage of this is that the air supplied through the air inlet pipe is guided only through the hollow driven shaft. For this purpose, the air inlet pipe is tightly connected to the flange ring, which in turn is tightly connected to the adapter ring, which is sealed to the driven shaft by the shaft seal.
[0021] In an advantageous embodiment, the flange ring is spaced away from the shaft, particularly axially. It is advantageous that the flange ring is stationary and the shaft is rotatable relative to the flange ring.
[0022] In an advantageous embodiment, a second adapter ring is rotationally fixed to the driving shaft at the end region of the driving shaft opposite the flange ring. An advantage of this is that a high torque can be transmitted to an agitator connected to the second adapter ring.
[0023] In an advantageous embodiment, the area of the driving shaft protruding from the lower part of the housing on the side facing away from the flange ring is covered by the second adapter ring.
[0024] The second flange ring is fitted onto the driven shaft. An advantage of this is that the shaft is protected.
[0025] In an advantageous embodiment, the second flange ring is pressed onto the driven shaft by screws which are axially aligned, in particular parallel to the axis of rotation of the driven shaft. An advantage of this is that a positive-locking connection can be achieved on the hollow wall of the driven shaft.
[0026] In an advantageous embodiment, the second adapter ring rests, in particular completely, against the driven shaft in the area of the driven shaft that projects from the lower housing part on the side facing away from the flange ring. The advantage here is that the shaft is protected.
[0027] In an advantageous embodiment, the outer diameter of the adapter ring increases monotonically with increasing distance from the bearing cap, particularly in the area covered axially by the driving shaft. This is advantageous because a high torque can be transmitted to the agitator.
[0028] In an advantageous embodiment, the first and second bearings are each designed as a pair of angular contact bearings. An advantage of this design is that high lateral forces can be tolerated.
[0029] In an advantageous embodiment, a seal, in particular an O-ring, is arranged between the first adapter ring and the flange ring. The advantage here is that the airflow can be conducted through the driven shaft without loss.
[0030] In an advantageous embodiment, the air supply pipe is connected to the flange ring in an airtight, and in particular, pressure-tight, manner. An advantage of this is that the airflow can be conducted through the driven shaft without loss.
[0031] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those 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 become apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art. The invention will now be explained in more detail with reference to schematic illustrations:
[0032] Figure 1 shows a gear arrangement according to the invention in an oblique view, which includes a gear.
[0033] Figure 2 shows the gearbox in an oblique view.
[0034] Figure 3 shows a sectional view of the gearbox.
[0035] Figure 4 shows a significant part of the gear assembly in a sectional oblique view.
[0036] As shown in the figures, the transmission arrangement has a transmission to which an air cooler 3 for oil is attached, so that oil pumped out of the transmission by a shaft end pump 40 flows through the air cooler 3 and is thereby cooled by an airflow which is driven by a fan wheel driven by an electric motor 10.
[0037] The air cooler 3 is preferably mounted on the top of the gearbox.
[0038] The oil flow delivered by the shaft end pump 40 is conveyed through a distributor 5, from which an oil pipe 4 supplies oil to the air cooler 3 and to which oil also flows from an oil filter 6.
[0039] The end-of-shaft pump 40 is driven by the input shaft 34 of the gearbox. This allows for a high rotational speed of the shaft 34 driving the end-of-shaft pump.
[0040] The driven shaft 7 of the gearbox is designed as a hollow shaft, particularly one oriented vertically. Thus, an agitator can be connected to the shaft 7, particularly at the bottom, and is attached to an adapter ring 36 which is rotationally fixed to the driven shaft 7, particularly at the axial end region of the shaft 7.
[0041] Conversely, a stream of hot air, particularly vertically downwards and coming from above, is guided through the hollow section of the driving shaft 7 into the material to be stirred or mixed, which may contain, for example, stones and water. This additional stream of hot air introduced into the material being mixed by the agitator further agitates the material, especially the stones, and facilitates stirring.
[0042] Since the heated air is passed through the hollow output shaft 7, efficient cooling of the gearbox is important. This cooling is ensured by the shaft end pump 40, which pumps the oil present in the interior of the gearbox through the oil pipe 4 to the air cooler 3, from where the cooled oil is then pumped back into the interior of the gearbox.
[0043] In the lower part of the housing 1, first bearings 37, in particular a pair of angular contact bearings, are provided for the rotatable support of the driven shaft 7.
[0044] A cover part 35 is placed on the lower housing part 1, which is tightly and releasably connected to the lower housing part 1.
[0045] In the cover part 35, second bearings 38, in particular a pair of angular contact bearings, are provided for the rotatable mounting of the driven shaft 7.
[0046] An adapter ring 9 is mounted on the side of the cover part 35 facing away from the lower housing part 1, and a flange ring is mounted on this adapter ring. The driven shaft 7 protrudes through the adapter ring 9.
[0047] The area covered by the flange ring 8 in the radial direction includes, in particular completely, the area covered by the driving shaft 7 in the radial direction. Thus, the driving shaft 7 is axially limited by the flange ring 8.
[0048] A bearing cup is formed on the lower part of the housing 1, which accommodates the first bearings 37, the inner ring of which is each mounted on the driven shaft 7.
[0049] A bushing section 39, connected to the bearing cup, projects from the bearing cup towards the cover section 35, specifically projecting upwards from the top of the bearing cup. The driven shaft 7 projects through the bushing section 39. A non-contacting labyrinth seal 31 is provided between the bushing section 39 and the driven shaft 7. The labyrinth seal 31 preferably extends above the oil level of the gearbox.
[0050] On the side of the first bearing 37 facing away from the axial side of the first bearing 37, a shaft seal 33 is mounted, which seals towards the driving shaft 7.
[0051] The outer face of the flange ring 8 features a pattern of threaded holes suitable for connection to an air guide tube through which the heated air is supplied under pressure. An airtight connection between the air guide tube and the flange ring 8 ensures a loss-free supply.
[0052] The adapter ring 9, connected to the flange ring 8, is connected to the cover part 35 and sealed towards the driven shaft 7. For this purpose, shaft seals are accommodated on the radial inner side of the adapter ring 9 and seal against the shaft 7.
[0053] Preferably a bearing cover 41 is arranged between the cover part 35 and the adapter ring 9, which is attached to the cover part 35 and axially limits the bearing 38.
[0054] The adapter ring 9 is sealed to the flange ring 8 by means of an O-ring.
[0055] The shaft 7 protrudes through the bearing cap 41, in which at least one shaft seal 30 is received in the bearing cap 41, which seals towards the shaft 7.
[0056] The adapter ring 9 has a larger outer diameter than the bearing cap 41. This provides a larger contact surface for the flange ring 8. Furthermore, the degree of protection is improved because both the bearing cap 41 and the adapter ring 9 seal against the shaft 7. In the event of failure of one of the shaft seals, a redundant shaft seal is still present.
[0057] The flange ring has a step on its end face facing the environment, so that the air guide tube can be slipped onto a radial projection of the flange ring 8 and thus rests against the step. Due to the radial width of the adapter ring 9 and therefore also of the flange ring 8, an air guide tube can be used whose clear inner diameter is larger than the outer diameter of the shaft 7.
[0058] The shaft seal ring included in the bearing cover 41 can be supplied with grease via a radially extending channel, so that the sealing function can be guaranteed without interference.
[0059] The adapter ring 36 is placed on the shaft 7 and fastened to the end face of the shaft 7 with axially directed screws, in particular screws aligned parallel to the axis of rotation of the shaft 7.
[0060] The adapter ring 36 covers the shaft 7 from the end face of the shaft to the part that receives the shaft seal 33. Thus, the adapter ring 36 covers the part of the shaft 7 that protrudes downwards from the gearbox and therefore protects this part of the shaft 7 from damage.
[0061] The outer diameter of the adapter ring 36 increases monotonically with increasing distance from the bearing cover 41. This allows a high torque to be applied to the agitator.
[0062] In further embodiments of the invention, the adapter ring 36 is made axially shorter, so that although less mass and moment of inertia act on the shaft 7, there is also less protection for the shaft 7. Reference numeral list
[0063] 1 Lower housing part
[0064] 2 Oil pipe
[0065] 3 air coolers
[0066] 4 Oil pipe
[0067] 5 distributors
[0068] 6 oil filters
[0069] 7. Driving shaft, especially hollow shaft; 8. Flange ring
[0070] 9 Adapter ring
[0071] 10 Electric motor
[0072] 30 shaft seal
[0073] 31 Labyrinth seal
[0074] 32 Lower housing part
[0075] 33 Shaft seal
[0076] 34 driving shaft
[0077] 35 Lid part
[0078] 36 Adapter ring
[0079] 37 first camp
[0080] 38 second camp
[0081] 39 Bushing part
[0082] 40 shaft end pump
[0083] 41 bearing caps
Claims
Patent claims:
1. Gear arrangement with one gearbox, wherein the gearbox has a housing formed from a lower housing part and a cover part placed on the lower housing part, wherein a first bearing of an output shaft is accommodated in the lower part of the housing, in particular in a bushing-shaped or cup-shaped thickening of the lower part of the housing, where a second bearing is incorporated in the lid part, wherein the second bearing is axially limited by a bearing cover connected to the cover part, characterized by the fact that the shaft is designed as a hollow shaft wherein an adapter ring is connected to the bearing cap on the side of the bearing cap facing away from the second bearing, wherein a flange ring is connected to the adapter ring on the side of the adapter ring facing away from the second bearing, wherein an air supply pipe can be connected to the flange ring.
2. Gear arrangement according to one of the preceding claims, characterized by the fact that the flange ring has a ring-shaped protrusion whose outer diameter is larger than the clear inner diameter of the driving shaft.
3. Gear arrangement according to one of the preceding claims, characterized by the fact that the outer diameter of the flange ring is larger than the outer diameter of the bearing cap.
4. Gear arrangement according to one of the preceding claims, characterized by the fact that the outer diameter of the adapter ring is larger than the outer diameter of the bearing cap.
5. Gear arrangement according to one of the preceding claims, characterized by the fact that The bearing cap contains a shaft seal ring, which seals towards the driven shaft.
6. Gear arrangement according to one of the preceding claims, characterized by the fact that The adapter ring contains a shaft seal which seals against the driven shaft.
7. Gear arrangement according to one of the preceding claims, characterized by the fact that the flange ring is spaced away from the shaft, particularly axially.
8. Gear arrangement according to one of the preceding claims, characterized in that a second adapter ring is rotationally fixed to the driving shaft at the end region of the driving shaft facing away from the flange ring.
9. Gear arrangement according to one of the preceding claims, characterized by the fact that the area of the driving shaft protruding from the lower part of the housing on the side facing away from the flange ring is covered by the second adapter ring, the second flange ring is placed on the driving shaft.
10. Gear arrangement according to one of the preceding claims, characterized by the fact that The second flange ring is pressed onto the driven shaft by screws which are axially aligned, in particular parallel to the axis of rotation of the driven shaft.
11. Gear arrangement according to one of the preceding claims, characterized by the fact that In the area of the driving shaft that protrudes from the lower part of the housing on the side facing away from the flange ring, the second adapter ring, in particular completely, rests against the driving shaft.
12. Gear arrangement according to one of the preceding claims, characterized by the fact that, especially in the area covered by the driving shaft in the axial direction, the outer diameter of the adapter ring increases monotonically with increasing distance from the bearing cap.
13. Gear arrangement according to one of the preceding claims, characterized by the fact that 14. Gear arrangement according to one of the preceding claims, characterized by the fact that A seal, in particular an O-ring, is arranged between the first adapter ring and the flange ring.
15. Gear arrangement according to one of the preceding claims, characterized by the fact that the air supply pipe is connected to the flange ring in an airtight manner, in particular in a pressure-tight manner.