Gearing comprising a housing

Abstract

The invention relates to a gearing comprising a housing, wherein: the housing has at least one continuous recess in which a bearing is accommodated; a bearing cover is connected to the housing; the bearing cover covers the recess, in particular the bearing cover rests on and / or is attached to the outside of the housing; and a first cooling element is in contact with the bearing cover and is connected to the bearing cover.

Description

[0001] Gearbox with a housing

[0002] Description:

[0003] The invention relates to a transmission with a housing.

[0004] It is generally known that the heat loss from a gearbox is dissipated into the ambient air via its housing.

[0005] From EP 2 686 583 B1, a transmission device is known as the closest prior art.

[0006] From DE 10 2022 003 369 A1 a gearbox with a housing part and a cover is known.

[0007] Convective cooling devices are known from DE 10 20219 124 978 A1.

[0008] The invention is therefore based on the object of developing a transmission with improved heat dissipation.

[0009] According to the invention, the object is achieved in the transmission according to the features specified in claim 1.

[0010] Important features of the invention in the transmission with a housing are that the housing has at least one continuous recess in which a bearing, in particular a rolling bearing, is received, wherein a bearing cover is connected to the housing, wherein the bearing cover covers the recess, in particular wherein the bearing cover rests and / or is attached to the outside of the housing, characterized in that a first heat sink rests on the bearing cover, in particular on the side of the bearing cover facing away from the housing, and is connected to the bearing cover, in particular by means of screws.

[0011] The advantage of this is that improved heat dissipation is achieved. In particular, the heat dissipation of the bearing covered by the bearing cap is efficiently dissipated via the first heat sink.

[0012] In an advantageous embodiment, the first heat sink is made of a first material, and the housing is made of a second material, wherein the first material has a higher thermal conductivity than the second material, in particular wherein the first material is aluminum and / or the second material is steel or cast steel. This is advantageous in that heat dissipation to the environment is improved.

[0013] In an advantageous embodiment, the housing consists of a lower housing section and an upper housing section mounted on the lower housing section. This is advantageous because oil can be safely filled up to the upper edge of the lower housing section.

[0014] In an advantageous embodiment, a splitting plane separates the lower housing part from the upper housing part, in particular wherein the axis of rotation of the input shaft of the transmission is contained in the splitting plane and the axis of rotation of the output shaft of the transmission is also contained in the splitting plane, in particular wherein the axis of rotation of the input shaft is aligned perpendicular to the axis of rotation of the output shaft of the transmission, in particular wherein the splitting plane comprises the contact area between the lower housing part and the upper housing part and / or the lower housing part and the upper housing part touch each other in the splitting plane. The advantage here is that the oil can be filled up to the splitting plane without any risk of leakage.

[0015] In an advantageous design, the splitting plane intersects the bearing mount. This is advantageous because the bearing mount is split, allowing the bearing, along with the associated shaft inserted through it, to be inserted into the bearing mount from above.

[0016] In an advantageous embodiment, the first heat sink is formed from a first and a second heat sink part, which are separated by the splitting plane, wherein the bearing cover is formed in one piece, in particular in one part, in particular wherein the splitting plane comprises the contact area between the first heat sink part and the second heat sink part and / or the first heat sink part and the second heat sink part touch each other in the splitting plane. The advantage here is that only the lower of the two heat sink parts can be left, since the heat flow coming from the oil can then still be dissipated sufficiently efficiently, and the upper of the two heat sink parts only needs to be provided when maximum heat output needs to be dissipated.

[0017] In an advantageous embodiment, the heat sink, in particular the first heat sink part and the second heat sink part, is designed as a continuous casting, in particular as an aluminum continuous casting. This is advantageous because it enables simple, cost-effective production.

[0018] In an advantageous embodiment, the first heat sink is flush with the bearing cap, in particular, the first heat sink does not protrude and / or extend laterally beyond the bearing cap. This is advantageous in that only a small installation space is required and collisions with other components can be avoided.

[0019] In an advantageous embodiment, the rotational axis of the bearing covered by the bearing cap is normal to a plane, with the vertical projection of the bearing cap into the plane completely containing the vertical projection of the heat sink. This is advantageous in that only a small installation space is required and collisions with other components are avoided.

[0020] In an advantageous embodiment, the cooling fins of the first heat sink extend parallel to the splitting plane. This advantageously allows the cooling air flow of a fan that is rotationally fixedly connected to the input shaft to flow along the cooling fins.

[0021] In an advantageous embodiment, thermal paste is arranged between the first heat sink and the bearing cap. This is advantageous in that a reduced heat transfer resistance can be achieved.

[0022] In an advantageous embodiment, the first heat sink rests against a first, flat, unfinished cast surface of the bearing cap. This is advantageous because it allows for simple production of the bearing cap.

[0023] In an advantageous alternative embodiment, the first heat sink rests against a first raw casting surface of the bearing cap provided with elevations, wherein the elevations protrude into corresponding recesses in the heat sink and extend parallel to the splitting plane. The advantage here is that the surface is enlarged and the heat sink has the corresponding recesses such that they lie surface-filling and touching against the elevations of the bearing cap. It is advantageous for this purpose that the elevations extend parallel to the cooling fins and thus the heat sink can be manufactured as a continuously cast part, wherein the continuous casting direction is aligned parallel to the direction of extension of the elevations. The additional effort required to provide elevations on the bearing cap is minimal because the bearing cap can be manufactured as a cast part.

[0024] In an advantageous embodiment, the housing base has a second flat, uncast surface on at least one of its side walls, against which a second heat sink rests and is fastened, in particular, by screws to the housing base. The cooling fins of the second heat sink extend parallel to the splitting plane, in particular, thermal paste is arranged between the second heat sink and the housing base. This is advantageous because it allows for reduced heat transfer resistance.

[0025] In an advantageous embodiment, the input gear stage of the transmission is an angular gear stage, in particular wherein the angular gear stage is a bevel gear stage, wherein the housing lower part has a third flat raw cast surface against which a third heat sink rests and is fastened, in particular fastened to the housing lower part with screws, wherein the normal of the third flat raw cast surface is aligned neither parallel to the splitting plane nor perpendicular to the splitting plane, but has an angle of between 20° and 70° to the splitting plane. The advantage here is that the input shaft has the highest speed and thus a high proportion of the power loss in the input area is transferred to the housing.The third heat sink rests against the housing base in such a way that the area covered by the third heat sink in the direction of the rotational axis of the driving shaft overlaps the area covered by the driving shaft in the direction of the rotational axis of the driving shaft. This ensures that as much power loss as possible from the driving area is transferred to the third heat sink. In particular, the angled alignment of the heat sink and the third flat raw cast surface allows a convective flow to build up, which flows along the third heat sink when a fan is not present. When a fan is present, part of the conveyed air flow flows along the third heat sink, as this air flow portion flows between the base, the foot sections, and the third heat sink.The channel thus formed from the base, the foot parts and the third heat sink flows into the adjoining fourth channel, which is limited by the base, the foot parts and the fourth heat sink.

[0026] In an advantageous embodiment, the lower housing part has on its underside, in particular the base side, a fourth flat raw cast surface against which a fourth heat sink rests and is fastened, in particular fastened to the lower housing part with screws, in particular wherein the cooling fins of the fourth heat sink extend parallel to the splitting plane, in particular wherein thermal paste is arranged between the fourth heat sink and the lower housing part, in particular wherein the fourth raw cast surface is aligned parallel to the splitting plane. It is advantageous in this case that an air flow conveyed by the fan is guided through the channel formed by the fourth heat sink, the base parts and the base on which the gearbox is placed by means of the base parts. The channel is therefore located underneath the gearbox. The base parts are preferably formed integrally, in particular in one piece, with the lower housing part.The foot parts protrude over the fourth heat sink, so that the fourth heat sink has a non-negligible distance from the floor and the gearbox is placed on the floor by means of the foot parts.

[0027] In an advantageous embodiment, two elongated, parallel foot parts protrude from the bottom side of the housing base toward the floor, particularly so that the gearbox can be placed on the floor using the foot parts, with the fourth heat sink arranged between the two foot parts. Advantageously, an air duct is formed through which an air stream can flow, driven by a fan that is rotationally fixed to the input shaft.

[0028] In an advantageous embodiment, the third heat sink is arranged between the two base sections. This advantageously creates an air channel through which an air stream can flow, driven by a fan that is non-rotatably connected to the input shaft.

[0029] In an advantageous embodiment, the second heat sink is a continuously cast aluminum part. This allows for simple and cost-effective production. Further advantages are outlined in the dependent claims. The invention is not limited to the combination of features in the claims. Those skilled in the art will recognize further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures, particularly from the problem and / or the problem posed by comparison with the prior art.

[0030] The invention will now be explained in more detail using schematic illustrations:

[0031] Figure 1 shows an oblique view of a transmission according to the invention.

[0032] Figure 2 shows a heat sink 1 of the gearbox in an oblique view.

[0033] Figure 3 shows the gearbox in a side view.

[0034] Figure 4 shows the gearbox in front view.

[0035] As shown in the figures, the transmission has a housing formed from an upper housing part 3 and a lower housing part 7.

[0036] To accommodate bearings for the shafts of the gearbox, a recess is formed in the housing, which is covered and / or closed with a bearing cover 2, which is pressed onto the housing by means of screws.

[0037] The gearbox housing is split, i.e., it consists of a lower part and a top part placed on top of it, with the lower housing part 7 acting as the lower part and the upper housing part 3 as the upper part. The splitting plane of the upper housing part 3 and the lower housing part 7 is the horizontal plane. The splitting plane can also be referred to as the separation plane of the two housing parts, i.e., the upper housing part 3 and the lower housing part 7, and / or as the contact plane at which the upper housing part 3 and the lower housing part 7 touch.

[0038] The splitting plane separates the recess and the heat sink 1 into two parts. However, the bearing cover 2 is made in one piece and covers the entire recess.

[0039] Although the bearing cover 2, which is designed as a single piece, is arranged between the housing and the first heat sink 1, the first heat sink 1 is designed in two parts, and the parting plane is the same as in the transmission housing. The first heat sink 1 is made of a first material that has a higher thermal conductivity than a second material from which the housing is made. Preferably, the first material is aluminum, and the second material is steel or cast material.

[0040] The gears on the shafts, which are fixed against rotation, mesh with each other, generating heat loss, which is transferred to the lubricating oil inside the gearbox. The bearings also generate heat loss, which is transferred to the lubricating oil.

[0041] To improve the dissipation of heat from the lubricating oil to the ambient air, a first heat sink 1 is provided on the bearing cover 2.

[0042] The bearing cap 2 has a first hole pattern of threaded holes for the screws, which are introduced into the bearing cap 2. The first heat sink 1 has through holes, which are arranged according to the same hole pattern as the first hole pattern.

[0043] The screws each protrude through one of the through holes of the first heat sink 1 and are each screwed into one of the threaded holes.

[0044] The first heat sink 1 is preferably formed from two heat sink parts that are mirror-symmetrical to one another, in particular with the splitting plane acting as the mirror plane.

[0045] The first heat sink 1 has cooling fins formed parallel to one another, which extend in the axial direction, in particular parallel to the axis of rotation of the input shaft of the transmission.

[0046] Each of the two heat sink sections of the first heat sink 1 is manufactured as a continuous casting. To accommodate the through-holes, the cooling fins of the respective heat sink section are interrupted. At least two of the cooling fins closest to each other are even interrupted multiple times because the corresponding through-holes are each the same distance from the splitting plane and the cooling fins extend parallel to the splitting plane. The two-part design of the heat sink 1 makes it possible to optionally omit the upper heat sink section while still maintaining efficient cooling. This is because, when at rest, the gearbox is preferably only filled with oil up to the splitting plane or slightly below. Therefore, the lubricating oil, which is heated particularly during operation, reaches the inside of the lower half of the bearing cover 2 and transfers the heat there to the bearing cover 2.Although the heat flow introduced is distributed throughout the entire bearing cap 2, the majority of the heat flow takes the shortest path, i.e., directly through the bearing cap 2 to the lower heat sink section, which is made of a material with good thermal conductivity and acts as a sink for the heat flow due to the cooling fins and the resulting lower temperature. The additional heat dissipation with the upper heat sink section installed is advantageous when the transmission operates at high speeds, thus ensuring that the oil covers the inside of the bearing cap 2 essentially evenly.

[0047] Thus, the two-part design of the first heat sink 1 allows the number of heat sink parts to be adapted to the operating mode of the gearbox.

[0048] Preferably, the first heat sink 1 is flush with the bearing cap 2; in particular, the first heat sink 1 does not protrude beyond the bearing cap 2. This prevents collision with other components, such as shafts or screws protruding from the gearbox, or other bearing caps.

[0049] Although cooling fins are integrally formed on the upper housing part 3, i.e., made of the same material as the upper housing part 3 itself, heat dissipation via these cooling fins formed on the upper housing part 3 is not very efficient, since the material of the upper housing part 3 has a lower thermal conductivity than the material of the first heat sink 1.

[0050] The bearing cover 2 is preferably manufactured as a cast part and has on its outer side a first flat raw cast surface against which the first heat sink 1 rests.

[0051] To reduce the heat transfer resistance from the bearing cap 2 to the first heat sink 1, thermally conductive paste is preferably applied between the bearing cap 2 and the heat sink 1. The housing base 7 has a second flat, unfinished cast surface on at least one of its side walls, against which a second heat sink 4 rests and is in turn fastened to the housing base 7 with screws. The cooling fins of the second heat sink 4 extend in the axial direction, in particular parallel to the splitting plane.

[0052] The gearbox has an angular gear stage on the input side, which is preferably designed as a bevel gear stage. Therefore, the housing is provided with an inclined surface below the input shaft, whose axis of rotation is located within the splitting plane. For this purpose, the lower housing section 7 has a third flat, unfinished cast surface, against which a third heat sink 5 rests and is also fastened to the lower housing section 7 with screws. The normal of the inclined surface is neither parallel to the splitting plane nor perpendicular to the splitting plane, but rather forms an angle between 20° and 70° to the splitting plane.

[0053] On the bottom side of the second housing lower part 7, i.e., on the side facing away from the housing upper part 3, the second housing part 7 also has a fourth flat unfinished cast surface on at least one of its side walls, against which a fourth heat sink 30 rests and is in turn fastened to the housing lower part 7 with screws. The cooling fins of the fourth heat sink 30 extend in the axial direction, in particular parallel to the splitting plane.

[0054] Two foot parts 6, each elongated and parallel to one another, project towards the floor on the bottom side of the housing bottom part 7, in particular so that the gear unit can be placed on the floor by means of the foot parts 6.

[0055] The third heat sink 5 is arranged between the two base parts 6.

[0056] The fourth heat sink 30 is arranged between the two foot parts 6.

[0057] Thermally conductive paste is also applied between the second, third, and fourth heat sinks (4, 5, 30) and the respective raw casting surface, particularly to reduce heat transfer resistance. In particular, all heat sinks (1, 4, 5, 30) are designed as extruded aluminum parts.

[0058] The axis of rotation of the gearbox's output shaft is preferably located within the splitting plane. Thus, the splitting plane separates the bearing mounts for the gearbox shaft bearings formed on the gearbox housing.

[0059] The foot parts 6 are designed in one piece, in particular in one piece, with the housing lower part 7.

[0060] In further embodiments according to the invention, a fan wheel is connected in a rotationally fixed manner to the driving shaft, so that the air flow conveyed by the fan flows along the cooling fins of the first heat sink 1 and along the cooling fins of the second heat sink 4 and along the cooling fins of the third heat sink 5 as well as along the cooling fins of the fourth heat sink 30.

[0061] List of reference symbols

[0062] 1 first heat sink 2 bearing cap

[0063] 3 Upper housing part

[0064] 4 second heat sink

[0065] 5 third heat sink

[0066] 6 Base part 7 Housing base

[0067] 30 fourth heat sink

Claims

Patent claims:

1. Gearbox with a housing, wherein the housing has at least one continuous recess in which a bearing, in particular a rolling bearing, is received, wherein a bearing cover is connected to the housing, wherein the bearing cover covers the recess, in particular wherein the bearing cover rests and / or is attached to the outside of the housing, characterized in that a first heat sink rests on the bearing cover, in particular on the side of the bearing cover facing away from the housing, and is connected to the bearing cover, in particular by means of screws.

2. Gearbox with a housing, wherein the housing has at least one continuous recess in which a bearing, in particular a rolling bearing, is received, wherein a bearing cover is connected to the housing, wherein the bearing cover covers the recess, in particular wherein the bearing cover rests and / or is attached to the outside of the housing, wherein a first heat sink rests on the bearing cover, in particular on the side of the bearing cover facing away from the housing, and is connected to the bearing cover, in particular by means of screws, characterized in that a splitting plane separates the lower housing part from the upper housing part, wherein the housing is formed from a lower housing part and a housing upper part placed on the lower housing part, wherein the first heat sink is formed from a first and a second heat sink part which are separated by the splitting plane, wherein the bearing cover is formed in one piece, in particular in one piece.

3. Transmission according to claim 1 or 2, characterized in that the first heat sink is made of a first material and the housing is made of a second material, wherein the first material has a higher thermal conductivity than the second material, in particular wherein the first material is aluminum and / or the second material is a steel or a cast steel.

4. Gearbox according to one of the preceding claims, characterized in that the housing is formed from a lower housing part and a housing upper part placed on the lower housing part, and / or that a splitting plane separates the lower housing part from the upper housing part, in particular wherein the axis of rotation of the input shaft of the gearbox is contained in the splitting plane and the axis of rotation of the output shaft of the gearbox is also contained in the splitting plane, in particular wherein the axis of rotation of the input shaft is aligned perpendicular to the axis of rotation of the output shaft of the gearbox, in particular wherein the splitting plane comprises the contact area between the lower housing part and the upper housing part and / or the lower housing part and the upper housing part touch each other in the splitting plane.

5. Gearbox according to one of the preceding claims, characterized in that the splitting plane intersects the bearing support.

6. Gearbox according to one of the preceding claims, characterized in that the first heat sink is formed from a first and a second heat sink part, which are separated by the splitting plane, wherein the bearing cover is formed in one piece, in particular in one part, in particular wherein the splitting plane comprises the contact area between the first heat sink part and the second heat sink part and / or the first heat sink part and the second heat sink part touch each other in the splitting plane.

7. Gearbox according to one of the preceding claims, characterized in that the heat sink, in particular the first heat sink part and the second heat sink part, is or are designed as a continuous casting, in particular as an aluminum continuous casting.

8. Gearbox according to one of the preceding claims, characterized in that the first heat sink is flush with the bearing cover, in particular wherein the first heat sink 1 does not protrude and / or protrude laterally beyond the bearing cover 2, and / or that the axis of rotation of the bearing covered by the bearing cover is the normal of a plane, wherein the vertical projection of the bearing cover into the plane completely contains the vertical projection of the heat sink.

9. Transmission according to one of the preceding claims, characterized in that the cooling fins of the first heat sink extend parallel to the splitting plane.

10. Gearbox according to one of the preceding claims, characterized in that thermal paste is arranged between the first heat sink and the bearing cover.

11. Gearbox according to one of the preceding claims, characterized in that the first heat sink rests against a first flat raw casting surface of the bearing cover or that the first heat sink rests against a first raw casting surface of the bearing cover which is provided with elevations, the elevations projecting into corresponding recesses of the heat sink and extending parallel to the splitting plane.

12. Gearbox according to one of the preceding claims, characterized in that the housing lower part has on at least one of its side walls a second flat raw cast surface, against which a second heat sink rests and is fastened, in particular fastened with screws to the housing lower part, in particular wherein the cooling fins of the second heat sink extend parallel to the splitting plane, in particular wherein thermal paste is arranged between the second heat sink and the housing lower part.

13. Gearbox according to one of the preceding claims, characterized in that the input gear stage of the gearbox is an angular gear stage, in particular wherein the angular gear stage is a bevel gear stage, wherein the housing lower part has a third flat raw cast surface, against which a third heat sink rests and is fastened, in particular is fastened to the housing lower part with screws, wherein the normal of the third flat raw cast surface is aligned neither parallel to the splitting plane nor perpendicular to the splitting plane, but has an angle between 20° and 70° to the splitting plane.

14. Gearbox according to one of the preceding claims, characterized in that the lower housing part has on its underside, in particular bottom side, a fourth flat raw cast surface, against which a fourth heat sink rests and is fastened, in particular fastened with screws to the lower housing part, in particular wherein the cooling fins of the fourth heat sink extend parallel to the splitting plane, in particular wherein thermal paste is arranged between the fourth heat sink and the lower housing part, in particular wherein the fourth raw cast surface is aligned parallel to the splitting plane.

15. Gearbox according to one of the preceding claims, characterized in that two foot parts, each elongated and parallel to one another, formed on the lower housing part protrude towards the ground on the bottom side of the lower housing part, in particular so that the gearbox can be placed on the ground by means of the foot parts, wherein the fourth heat sink is arranged between the two foot parts, and / or that the third heat sink is arranged between the two foot parts, and / or that the second heat sink is an aluminum extruded part.

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