Gearing comprising a two-part housing and a cooling element

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, wherein a bearing cover is connected to the housing, wherein the bearing cover covers the recess, in particular, wherein the bearing cover rests on and / or is attached to the outside of the housing, wherein a fourth cooling element is in contact with the bearing cover and is connected to the bearing cover.

Description

[0001] GEARBOX WITH A TWO-PIECE HOUSING AND A HEAT SINK

[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 DE 10 2009 014 314 A1, the closest prior art is a gearbox with a splitting housing.

[0006] A transmission device is known from EP 2 686 583 B1.

[0007] From DE 10 2022 003 369 A1 a gearbox with a lower housing part and with an upper housing part placed on the lower housing part is known.

[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 or 2.

[0010] Important features of the invention in the gearbox with a housing are that the housing has a lower housing part and a housing upper part placed on the lower housing part, wherein the lower housing part has on its underside, in particular on its side facing away from the upper housing part, in particular the bottom side, a first flat raw cast surface, against which a first heat sink rests and is fastened, in particular with a single screw to the lower housing part, in particular wherein the first flat raw cast surface is recessed on the lower housing part, so that the first heat sink is arranged on the lower housing part in a manner that is secure against rotation, in particular about the screw axis of the screw, in particular wherein the cooling fins of the first heat sink are aligned parallel to the input shaft of the gearbox or extend parallel to the splitting plane separating the lower housing part from the upper housing part,in particular, wherein thermally conductive paste is arranged between the first heat sink and the housing base, in particular, wherein the first raw casting surface is aligned parallel to the splitting plane separating the housing upper part from the housing lower part, in particular, wherein the first heat sink is designed as a continuous casting part, in particular, its continuous casting direction is aligned parallel to the direction of extension of the cooling fins and / or parallel to the direction of the axis of rotation of the driving shaft, in particular, wherein at least two of the cooling fins of the first heat sink are designed with two or more interruptions to keep space free for the actuation of screws that pass through the first heat sink and are screwed into threaded holes in the housing lower part, in particular into the underside of the housing lower part.

[0011] The advantage here is that an airflow channel can be created on the underside, allowing for efficient heat dissipation. Furthermore, the first heat sink can be protected from external forces, as the cooling fins extend into the channel, which can be protected by the feet and the bottom of the case.

[0012] According to the invention, the channel is limited by the base parts, the first heat sink and the housing base, as well as the floor surface on which the gearbox is mounted. Furthermore, during operation of the gearbox, the oil present in the interior of the gearbox is foamed by the rotary movement of the gearing parts and thus mixed with air. Only the oil sump, i.e. the lowest area of ​​the oil, remains as oil without any air admixture. Thus, in this lower area, there is better thermal conductivity, and the heat loss from the bearings and gearing parts is transferred to the

[0013] The bottom of the gearbox and from there to the first heat sink. Placing the first heat sink below the gearbox housing thus enables more efficient and improved heat dissipation of the gearbox.

[0014] A single screw can also be used for fastening. This enables quick and cost-effective installation of the first heat sink. In order to secure the first heat sink against twisting, i.e. rotation around the screw axis, despite the use of only a single screw, the contact surface of the first heat sink on the housing base is designed as a recess, so that the recess is bordered by material that protrudes beyond the contact surface and thereby forms a positive limit against twisting of the first heat sink. Preferably, a chamfer acting as an insertion bevel is formed on the protruding material. This simplifies the attachment of the first heat sink. In particular, the chamfer is formed completely and continuously around the edge of the contact surface.

[0015] According to the invention according to claim 2 or in an advantageous embodiment, two foot parts, each formed elongately and parallel to one another on the lower housing part, in particular two each on the underside of the lower housing part, protrude on the side of the lower housing part facing away from the upper housing part and / or protrude on the lower housing part, in particular on the bottom side of the lower housing part, on the side of the upper housing part facing away from the upper housing part, in particular towards the floor, in particular further than the first heat sink, in particular wherein the foot parts are formed integrally, in particular in one piece, on the lower housing part, in particular so that the gear can be placed on the floor by means of the foot parts, wherein the first heat sink is arranged between the two foot parts, in particular wherein the cooling fins of the first heat sink extend parallel to the foot parts.The advantage here is that the heat capacity can be absorbed by the base parts, which also enables stable positioning of the gearbox. The base parts also function as channel boundaries and protection for the first heat sink. The base parts are preferably designed in an elongated, cuboid shape, in particular with the longest dimension oriented parallel to the splitting plane and / or parallel to the rotational axis of the input shaft and / or to the direction of extension of the cooling fins of the first heat sink.

[0016] In an advantageous embodiment, tab regions are formed on the base parts, which protrude on the base parts, in particular parallel to the splitting plane separating the lower housing part from the upper housing part, wherein the lower housing part is designed as a single piece, in particular in one piece, with the base parts and the tab regions, in particular wherein the tab regions each protrude on the side of the respective base part facing away from the first heat sink, in particular for resting on the floor, in particular wherein each tab region has at least one through-hole, in particular at least one through-hole aligned parallel to the normal direction of the splitting plane. The advantage here is that a stable installation of the gearbox is enabled.

[0017] In an advantageous embodiment, the maximum distance between the cooling fins and the first flat, uncast surface is smaller than the maximum distance between the base parts and the first flat, uncast surface. Advantageously, the base parts protrude beyond the first heat sink, particularly toward the bottom, i.e., downwards from the housing base.

[0018] In an advantageous embodiment, a channel extending beneath the gearbox is defined by the base parts, the first heat sink, and the floor surface on which the gearbox is mounted. This advantageously eliminates the need for additional effort to provide a channel for the cooling air flow. In an advantageous embodiment, a first groove is provided in each of the base parts, into which a protruding or projecting region, in particular a rail region, on the first heat sink is inserted, in particular wherein the maximum extension of the first heat sink in the direction perpendicular to the continuous casting direction or to the direction of the axis of rotation of the input shaft of the gearbox, in particular the transverse direction, is greater than the smallest distance, measured in this direction, between the two base parts, in particular wherein the two first grooves are aligned parallel to one another.In particular, the first heat sink has a base region to which the cooling fins of the first heat sink are cast and / or molded, wherein the base region protrudes towards the respective foot part on the first heat sink, in particular wherein the first grooves open into the surroundings of the gearbox parallel to the continuous casting direction, in particular so that the first heat sink can first be inserted during assembly of the gearbox and then screwed on with a single screw, in particular which protrudes through the first heat sink and can be screwed into a threaded hole in the housing base. The advantage here is that assembly is simplified by inserting the first heat sink into the first grooves in a first manufacturing step and then screwing the screw into the threaded hole in the housing base. Thus, in the first manufacturing step, the first heat sink can be brought into the exact positionin which the screw can then be screwed into the threaded hole of the housing base in the second manufacturing step.

[0019] In an advantageous embodiment, a second groove is provided in each of the base parts, into which a region, in particular a rail region, projecting or protruding on the second heat sink is inserted, wherein the respective second groove is not aligned coaxially with a respective first groove but has an angle of between 20° and 70° with a respective first groove, in particular wherein the maximum extension of the second heat sink in the direction perpendicular to the continuous casting direction or to the direction of the axis of rotation of the input shaft of the gear unit, in particular transverse direction, is greater than the smallest distance, measured in particular in this direction, between the two base parts, in particular wherein the two second grooves are aligned parallel to one another, in particular wherein the second heat sink has a base region to which the cooling fins of the second heat sink are cast and / or formed,wherein the base region protrudes towards the respective foot part on the second heat sink, in particular wherein the second grooves open into the surroundings of the gearbox parallel to the continuous casting direction, in particular so that the second heat sink can first be inserted during assembly of the gearbox and then screwed on with a single screw, in particular which protrudes through the second heat sink and can be screwed into a second threaded hole in the housing base. The advantage here is that assembly is simplified by inserting the second heat sink into the second grooves in an initial manufacturing step and then screwing the screw into the second threaded hole in the housing base. Thus, in the initial manufacturing step, the first heat sink can be brought into the exact positionin which the screw can then be screwed into the second threaded hole of the housing base in the second manufacturing step.

[0020] In an advantageous embodiment, a fan is connected to the input shaft of the gearbox in a rotationally fixed manner. This is advantageous because the air flow can be generated by a passive fan. In particular, the air flow is only generated when the input shaft rotates.

[0021] 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 lower housing part has a second flat raw cast surface against which a second heat sink rests and is fastened, in particular fastened to the lower housing part with screws, wherein the normal of the second 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. It is advantageous in this case that the air flow is guided along the second heat sink and is thus fed into the channel which is bordered by the first heat sink and the base parts.

[0022] In an advantageous embodiment, the lower housing part has on its underside, in particular on its side facing away from the upper housing part, in particular the bottom side, a first flat uncast surface, against which a first heat sink rests and is fastened, in particular fastened to the lower housing part with a single screw, in particular wherein the first flat uncast surface is arranged in a recessed manner on the lower housing part, so that the first heat sink is arranged on the lower housing part in a manner that is secure against rotation, in particular secure against rotation about the screw axis of the screw, in particular wherein the cooling fins of the first heat sink are aligned parallel to the input shaft of the gear unit or extend parallel to the splitting plane separating the lower housing part from the upper housing part, in particular wherein thermally conductive paste is arranged between the first heat sink and the lower housing part,in particular, wherein the first raw casting surface is aligned parallel to the splitting plane separating the upper housing part from the lower housing part, in particular, wherein the first heat sink is designed as a continuous casting part, in particular, its continuous casting direction is aligned parallel to the direction of extension of the cooling fins and / or parallel to the direction of the axis of rotation of the input shaft, in particular, wherein at least two of the cooling fins of the first heat sink are designed with two or more interruptions to keep space free for the actuation of screws that pass through the first heat sink and are screwed into threaded holes in the lower housing part, in particular into the underside of the lower housing part. The advantage here is that simple assembly is possible. For this purpose, the number of screws can be selected to be minimal,In particular, for example, only a single screw is used to secure the first heat sink. To enable uninterrupted operation of the respective screw, at least two adjacent cooling fins are designed to be interrupted, so that the space created by the interruption can be used by a tool operating the respective screw.

[0023] In an advantageous embodiment, two foot parts, each formed elongately on the lower housing part, in particular two each on the underside of the lower housing part, protrude parallel to one another on the side of the lower housing part facing away from the upper housing part and / or protrude on the lower housing part, in particular on the bottom side of the lower housing part, on the side of the upper housing part facing away from the upper housing part, in particular towards the floor, in particular further than the first heat sink, in particular wherein the foot parts are formed integrally, in particular in one piece, on the lower housing part, in particular so that the gear unit can be placed on the floor by means of the foot parts, wherein the first heat sink is arranged between the two foot parts, in particular wherein the cooling fins of the first heat sink extend parallel to the foot parts. It is advantageous in this case that the first heat sink is arranged in a protected manner between the foot parts.In addition, the base parts increase the heat capacity of the lower part of the housing and dissipate a portion of the gearbox's heat loss to the floor.

[0024] In an advantageous embodiment, tab regions are formed on the base parts, which protrude on the base parts, in particular parallel to the splitting plane separating the lower housing part from the upper housing part, wherein the lower housing part is designed in one piece, in particular in one part, with the base parts and the tab regions, in particular wherein the tab regions each protrude on the side of the respective base part facing away from the first heat sink, in particular for resting on the floor, in particular wherein each tab region has at least one through-hole, in particular at least one through-hole aligned parallel to the normal direction of the splitting plane. The advantage here is that the tab regions increase the standing area of ​​the lower housing part on the floor and also increase the thermal capacity of the lower housing part.The respective holes further increase the surface area of ​​the respective tab areas, thus further improving heat dissipation. The tab areas protrude from the respective base on the side facing away from the heat sink. This way, the channel for the airflow past the first heat sink is not constricted.

[0025] In an advantageous embodiment, the maximum distance between the cooling fins and the first flat, uncast surface is smaller than the maximum distance between the base parts and the first flat, uncast surface. This is advantageous because the base is spaced apart from the first heat sink, allowing a sufficiently large airflow to pass through.

[0026] In an advantageous embodiment, a channel extending beneath the gearbox is defined by the base parts, the first heat sink, and the floor surface on which the gearbox is mounted. This is advantageous because it allows for simple manufacturing.

[0027] In an advantageous embodiment, a fan is non-rotatably connected to the input shaft of the gearbox. This allows the use of a passive fan to promote the airflow.

[0028] 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 lower housing part has a second flat, uncast surface against which a second heat sink rests and is fastened, in particular fastened to the lower housing part with screws, wherein the normal of the second flat, uncast surface is aligned 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. The advantage here is that the air flow of the fan is introduced into the duct not at an angle of 90°, but at a smaller angle.In an advantageous embodiment, 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 fourth 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.

[0029] 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 fourth heat sink.

[0030] In an advantageous embodiment, the fourth heat sink is made of a fourth material, and the housing is made of a third material, wherein the fourth material has a higher thermal conductivity than the third material, in particular wherein the fourth material is aluminum and / or the third material is steel or cast steel. This is advantageous in that heat dissipation to the environment is improved.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] In an advantageous embodiment, the fourth heat sink is formed from a fourth and a third 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 fourth heat sink part and the third heat sink part and / or the fourth heat sink part and the third 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.

[0035] In an advantageous embodiment, the heat sink, in particular the fourth heat sink part and the third heat sink part, are designed as a continuous casting, in particular as an aluminum continuous casting. This is advantageous because it enables simple, cost-effective production. In an advantageous embodiment, the fourth heat sink is flush with the bearing cap, in particular, the fourth heat sink does not protrude and / or project laterally beyond the bearing cap. This is advantageous because only a small installation space is required and collisions with other components can be avoided.

[0036] 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.

[0037] In an advantageous embodiment, the cooling fins of the fourth heat sink extend parallel to the splitting plane. This advantageously allows the cooling air flow of a fan that is non-rotatably connected to the input shaft to flow along the cooling fins.

[0038] In an advantageous embodiment, thermal paste is arranged between the fourth heat sink and the bearing cap. This has the advantage of reducing heat transfer resistance.

[0039] In an advantageous embodiment, the fourth heat sink rests against a fourth, flat, unfinished cast surface of the bearing cap. This is advantageous because it allows for simple production of the bearing cap.

[0040] In an advantageous alternative embodiment, the fourth heat sink rests against a fourth raw casting surface of the bearing cap which is 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 low because the bearing cap can be manufactured as a cast part.

[0041] In an advantageous embodiment, the housing base has a third flat, uncast surface on at least one of its side walls, against which a third heat sink rests and is fastened, in particular, by screws to the housing base. The cooling fins of the third heat sink extend parallel to the splitting plane, in particular, thermal paste is arranged between the third heat sink and the housing base. This is advantageous because it allows for reduced heat transfer resistance.

[0042] 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 second flat raw cast surface against which a second heat sink rests and is fastened, in particular fastened to the housing lower part with screws, wherein the normal of the second flat raw cast surface is 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 second heat sink rests against the housing base in such a way that the area covered by the second 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 second heat sink. In particular, the angled alignment of the heat sink and the second flat raw cast surface allows a convective flow to build up, which flows along the second heat sink when a fan is not present. When a fan is present, part of the conveyed air flow flows along the second heat sink, as this air flow portion flows between the base, the foot sections, and the second heat sink.The channel thus formed from the base, the foot parts and the second heat sink flows into the adjoining first channel, which is limited by the base, the foot parts and the first heat sink.

[0043] In an advantageous embodiment, the lower housing part has on its underside, in particular the floor side, a first flat raw cast surface against which a first heat sink rests and is fastened, in particular fastened to the lower housing part with screws, in particular wherein the cooling fins of the first heat sink extend parallel to the splitting plane, in particular wherein thermal paste is arranged between the first heat sink and the lower housing part, in particular wherein the first 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 first heat sink, the foot parts and the floor on which the gearbox is placed by means of the foot parts. The channel is therefore located underneath the gearbox. The foot parts are preferably formed integrally, in particular in one piece, with the lower housing part.The foot parts protrude over the first heat sink so that the first heat sink has a non-negligible distance from the floor and the gearbox is placed on the floor by means of the foot parts.

[0044] In an advantageous embodiment, two elongated, parallel foot parts, each formed on the lower housing part, protrude towards the floor on the bottom side of the lower housing part, in particular so that the gearbox can be placed on the floor by means of the foot parts, with the first heat sink being arranged between the two foot parts. It is advantageous in this case that an air duct is formed through which an air stream can flow, which is driven by a fan that is connected in a rotationally fixed manner to the input shaft. In an advantageous embodiment, the second heat sink is arranged between the two foot parts. It is advantageous in this case that an air duct is formed through which an air stream can flow, which is driven by a fan that is connected in a rotationally fixed manner to the input shaft.

[0045] In an advantageous embodiment, the third 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.

[0046] The invention will now be explained in more detail using schematic illustrations:

[0047] Figure 1 shows an oblique view of a transmission according to the invention.

[0048] Figure 2 shows a heat sink 1 of the gearbox in an oblique view.

[0049] Figure 3 shows the gearbox in a side view.

[0050] Figure 4 shows the gearbox in front view.

[0051] As shown in the figures, the transmission has a housing formed from an upper housing part 3 and a lower housing part 7.

[0052] To accommodate bearings of 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.

[0053] 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.

[0054] 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.

[0055] Although the bearing cover 2, which is designed as a single piece, is arranged between the housing and the fourth heat sink 1, the fourth heat sink 1 is designed in particular as a three-piece unit, and the parting plane is the same as in the transmission housing. The fourth heat sink 1 is made of a fourth material that has a higher thermal conductivity than a third material from which the housing is made. Preferably, the fourth material is aluminum, and the third material is steel or cast material.

[0056] 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.

[0057] To improve the dissipation of heat from the lubricating oil to the ambient air, a fourth heat sink 1 is provided on the bearing cover 2.

[0058] The bearing cap 2 has a fourth hole pattern of threaded holes for the screws, which are incorporated into the bearing cap 2. The fourth heat sink 1 has through holes, which are arranged according to the same hole pattern as the fourth hole pattern.

[0059] The screws each protrude through one of the through holes of the fourth heat sink 1 and are each screwed into one of the threaded holes.

[0060] The fourth 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.

[0061] The fourth 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 gearbox.

[0062] Each of the two heat sink sections of the fourth 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 three-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 or slightly below the splitting plane. Therefore, the lubricating oil, which heats up particularly during operation, preferentially 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.

[0063] Thus, the three-part design of the fourth heat sink 1 allows the number of heat sink parts to be adapted to the operating mode of the gearbox.

[0064] Preferably, the fourth heat sink 1 is flush with the bearing cap 2; in particular, the fourth 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.

[0065] 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 fourth heat sink 1.

[0066] The bearing cover 2 is preferably manufactured as a cast part and has on its outer side a fourth flat raw cast surface against which the fourth heat sink 1 rests.

[0067] To reduce the heat transfer resistance from the bearing cap 2 to the fourth heat sink 1, thermal paste is preferably applied between the bearing cap 2 and the heat sink 1. The housing base 7 has a third flat, unfinished cast surface on at least one of its side walls, against which a third heat sink 4 rests and is in turn fastened to the housing base 7 with screws. The cooling fins of the third heat sink 4 extend in the axial direction, in particular parallel to the splitting plane.

[0068] 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 second flat, uncast surface, against which a second heat sink 5 rests and is also fastened to the lower housing section 7 with a single screw. 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.

[0069] On the bottom side of the housing base 7, i.e., the side facing away from the housing top 3, the housing base 7 also has a first flat, unfinished cast surface on at least one of its side walls, against which a first heat sink 30 rests and is fastened to the housing base 7 with screws. The cooling fins of the first heat sink 30 extend in the axial direction, in particular parallel to the splitting plane.

[0070] 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.

[0071] The second heat sink 5 is arranged between the two base parts 6.

[0072] The first heat sink 30 is arranged between the two foot parts 6.

[0073] Thermally conductive paste is also arranged between the third, second and first heat sink (4, 5, 30) and the respective raw casting surface, in particular in order to reduce the heat transfer resistance.

[0074] In particular, all heat sinks (1, 4, 5, 30) are designed as extruded aluminum parts. The rotational axis of the gearbox's output shaft is preferably located within the splitting plane. Thus, the splitting plane separates the bearing mounts formed on the gearbox housing for the gearbox shaft bearings.

[0075] The foot parts 6 are designed in one piece, in particular in one piece, with the housing lower part 7 and extend parallel to the axis of rotation of the driving shaft.

[0076] In the first heat sink 30, cooling fins are also interrupted several times in order to create free space for the actuation of connecting screws which pass through the first heat sink and are screwed into threaded holes in the lower housing part 7, in particular the underside, in particular the bottom side, of the lower housing part 7.

[0077] On each of the two foot parts 6, spaced-apart tab regions 8, in particular shoe regions, are formed, which protrude laterally, in particular perpendicular to the axis of rotation of the driving wells and at a constant distance from the splitting plane and / or parallel to the splitting plane, and thus provide an enlarged foot surface when setting up the gear.

[0078] Each of the tab areas 8 has a particularly vertically continuous bore, so that fastening screws can be passed through the bore and screwed into a respective threaded bore. Furthermore, the tab areas provide improved heat dissipation by increasing the thermal capacity and surface area, as well as by contact with the base, which can be made of metal, for example, and thus capable of absorbing and dissipating a significant heat flow.

[0079] In further embodiments according to the invention, a simplified assembly of the first heat sink 30 is achieved. For this purpose, rail areas protrude on both sides of the first heat sink 30 perpendicular to the continuous casting direction of the first heat sink, which is designed as an aluminum continuous casting part, and extend parallel to the continuous casting direction. Each of the two rail areas protrudes into a first groove of a respective base part 6. Thus, during assembly, the first heat sink 30 can first be inserted into the first grooves and then fastened with a screw or the screw, which is screwed into a threaded hole in the underside of the housing base 7. As a result of the

[0080] By accommodating the rail areas in the first grooves, the first heat sink 30 is positively secured in the vertical direction; by means of the screw, the first heat sink is pressed flat against the underside of the housing base 7.

[0081] Since the first heat sink manufactured as a continuous casting has a plate-shaped base region to which the cooling fins are cast, only the continuous casting has to be cut off at the edge in such a way that the base region protrudes on both sides towards the foot parts 6 and thus the cooling fin closest to the respective foot part 6 has a greater distance from the respective foot part 6 closest to it than the base region.

[0082] The extension of the base region in the transverse direction, i.e. perpendicular to the continuous casting direction and / or direction of the axis of rotation of the input shaft of the gear unit, is greater than the distance between the two foot parts 6 from one another, in particular the distance, in particular the smallest distance, measured in the transverse direction between the two foot parts 6 from one another.

[0083] Thus, one of the first grooves, into which the base region projects, is arranged in each of the two foot parts 6. This allows the first heat sink 30, with its protruding areas of the base region acting as rails—i.e., the rail areas of the first heat sink—to be inserted into the foot parts 6 of the housing base 7 during assembly in a first manufacturing step. In a second manufacturing step, the first heat sink does not need to be held upright for screwing on; instead, it is already brought into the vertical position in which screwing on can be carried out. Before the first manufacturing step, the base region of the first heat sink is coated with thermally conductive paste, which is then squeezed between the first heat sink 30 and the housing base 7 at the latest in the second manufacturing step.Preferably, the second heat sink 5 is also designed with a projecting base region so that it can be inserted into corresponding second grooves of the foot parts 6, wherein, however, the second grooves are not aligned parallel to the first grooves but have an angle between 0° and 90° to the first grooves.

[0084] Preferably, the second grooves open into the first grooves. This allows for simple production of the grooves.

[0085] In further embodiments according to the invention, a fan wheel is connected in a rotationally fixed manner to the input shaft, so that the air flow conveyed by the fan flows along the cooling fins of the fourth heat sink 1 and along the cooling fins of the third heat sink 4 and along the cooling fins of the second heat sink 5 as well as along the cooling fins of the first heat sink 30.

[0086] In further embodiments according to the invention, the first heat sink 30 is attached to the housing base 7 with only a single screw instead of several screws. To ensure the anti-twist alignment of the first heat sink 30 during assembly, the flat uncast surface against which the heat sink 30 rests is recessed in the housing base 7.

[0087] List of reference symbols

[0088] 1 fourth heat sink 2 bearing cap

[0089] 3 Upper housing part

[0090] 4 third heat sink

[0091] 5 second heat sink

[0092] 6 Base part 7 Housing base

[0093] 8 Tongue area, especially shoe area

[0094] 30 first heat sink

Claims

Patent claims:

1. A gearbox with a housing, in particular a gearbox with a housing that can be placed on a floor, wherein the housing has a lower housing part and an upper housing part placed on the lower housing part, wherein the lower housing part has a first flat uncast surface on its underside, in particular on its side facing away from the upper housing part, in particular the floor side, against which a first heat sink rests and is fastened, in particular with a single screw to the lower housing part, in particular wherein the first flat uncast surface is recessed in the lower housing part, so that the first heat sink is arranged on the lower housing part in a manner that is secure against rotation, in particular secure against rotation about the screw axis of the screw, in particular wherein the cooling fins of the first heat sink are aligned parallel to the input shaft of the gearbox or extend parallel to the splitting plane separating the lower housing part from the upper housing part,in particular, wherein thermally conductive paste is arranged between the first heat sink and the housing lower part, in particular, wherein the first raw casting surface is aligned parallel to the splitting plane separating the housing upper part from the housing lower part, in particular, wherein the first heat sink is designed as a continuous casting part, in particular, its continuous casting direction is aligned parallel to the direction of extension of the cooling fins and / or parallel to the direction of the axis of rotation of the driving shaft, in particular, wherein at least two of the cooling fins of the first heat sink are designed with two or more interruptions to keep space free for the actuation of screws which pass through the first heat sink and into threaded holes of the, housing base, especially screwed into the underside of the housing base.

2. A gearbox with a housing, wherein the housing has a lower housing part and a housing upper part placed on the lower housing part, wherein the lower housing part has on its underside, in particular on its side facing away from the upper housing part, in particular the bottom side, a first flat uncast surface, against which a first heat sink rests and is fastened, in particular with a single screw to the lower housing part, in particular wherein the first flat uncast surface is recessed in the lower housing part, so that the first heat sink is arranged on the lower housing part in a manner that is secure against rotation, in particular about the screw axis of the screw, in particular wherein the cooling fins of the first heat sink are aligned parallel to the input shaft of the gearbox or extend parallel to the splitting plane separating the lower housing part from the upper housing part,in particular, wherein thermally conductive paste is arranged between the first heat sink and the housing base, in particular, wherein the first raw cast surface is aligned parallel to the splitting plane separating the housing upper part from the housing lower part, in particular, wherein the first heat sink is designed as a continuous casting, in particular, its continuous casting direction is aligned parallel to the direction of extension of the cooling fins and / or parallel to the direction of the axis of rotation of the driving shaft, in particular, wherein at least two of the cooling fins of the first heat sink are designed with two or more interruptions to keep space free for the actuation of screws that pass through the first heat sink and are screwed into threaded holes in the housing lower part, in particular into the underside of the housing lower part. wherein a first groove is introduced into a foot part of the housing lower part,into which a protruding or projecting area on the first heat sink, in particular a rail area, is inserted.

3. Gearbox according to claim 1 or 2, characterized in that two foot parts, each on the lower housing part, in particular two each on the underside of the lower housing part, elongated and parallel to one another protrude on the side of the lower housing part facing away from the upper housing part and / or on the lower housing part, in particular on the bottom side of the lower housing part, on the side of the upper housing part facing away from the upper housing part, in particular towards the floor, in particular further than the first heat sink, in particular wherein the foot parts are formed in one piece, in particular in one piece, on the lower housing part, in particular so that the gearbox can be placed on the floor by means of the foot parts, wherein the first heat sink is arranged between the two foot parts, in particular wherein the cooling fins of the first heat sink extend parallel to the foot parts.

4. Gearbox according to one of the preceding claims, characterized in that tab areas are formed on the base parts, which protrude on the base parts, in particular parallel to the splitting plane separating the lower housing part from the upper housing part, wherein the lower housing part is designed in one piece, in particular in one part, with the base parts and the tab areas, in particular wherein the tab areas each protrude on the side of the respective base part facing away from the first heat sink, in particular for resting on the floor, in particular wherein each tab area has at least one through-hole, in particular at least one through-hole aligned parallel to the normal direction of the splitting plane.

5. Gearbox according to one of the preceding claims, characterized in that the maximum distance of the cooling fins to the first flat raw casting surface is smaller than the maximum distance of the base parts to the first flat raw casting surface.

6. Gearbox according to one of the preceding claims, characterized in that a channel passing under the gearbox is delimited by the base parts, the first heat sink and the floor surface on which the gearbox is mounted.

7. Gearbox according to one of the preceding claims, characterized in that a first groove is introduced into each of the base parts, into which a region, in particular a rail region, protruding or projecting on the first heat sink is inserted, in particular wherein the maximum extent of the first heat sink in the direction perpendicular to the continuous casting direction or to the direction of the axis of rotation of the input shaft of the gear box, in particular the transverse direction, is greater than the smallest distance, in particular measured in this direction, between the two base parts, in particular wherein the two first grooves are aligned parallel to one another, in particular wherein the first heat sink has a base region to which the cooling fins of the first heat sink are cast and / or molded, wherein the base region protrudes towards the respective base part on the first heat sink,in particular, wherein the first grooves open into the surroundings of the gearbox parallel to the continuous casting direction, in particular so that the first heat sink can first be inserted during assembly of the gearbox and then screwed on with a single screw, in particular which projects through the first heat sink and can be screwed into a threaded hole in the lower housing part.

8. Gearbox according to one of the preceding claims, characterized in that a second groove is introduced into each of the base parts, into which a region, in particular a rail region, projecting or protruding on the second heat sink is inserted, wherein the respective second groove is not aligned coaxially with a respective first groove, but has an angle of between 20° and 70° with a respective first groove, in particular wherein the maximum extension of the second heat sink in the direction perpendicular to the continuous casting direction or to the direction of the axis of rotation of the input shaft of the gearbox, in particular transverse direction, is greater than the smallest distance, measured in particular in this direction, between the two base parts, in particular wherein the two second grooves are aligned parallel to one another, in particular wherein the second heat sink has a base region,on which the cooling fins of the second heat sink are cast and / or formed, wherein the base region protrudes towards the respective foot part on the second heat sink, in particular wherein the second grooves open into the surroundings of the gearbox parallel to the continuous casting direction, in particular so that the second heat sink can first be inserted during assembly of the gearbox and then screwed on with a single screw, in particular which projects through the second heat sink and can be screwed into a threaded hole in the housing base.

9. Gearbox according to one of the preceding claims, characterized in that a fan is rotationally connected to the input shaft of the gearbox, and / or 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 lower housing part has a second flat raw cast surface, against which a second heat sink rests and is fastened, in particular is fastened to the lower housing part with screws, wherein the normal of the second 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.

10. Gearbox according to one of the preceding claims, characterized in 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 fourth 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.

11. Gearbox according to one of the preceding claims, characterized in that the fourth 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, 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 housing lower part and the housing upper part and / or the housing lower part and the housing upper part touch each other in the splitting plane, and / or that the splitting plane intersects the bearing receptacle, and / or that, the fourth heat sink is formed from a fourth and a third heat sink part, which are separated by the splitting plane, wherein the bearing cover is formed integrally, in particular in one piece, in particular wherein the splitting plane comprises the contact area between the fourth heat sink part and the third heat sink part and / or the fourth heat sink part and the third heat sink part touch each other in the splitting plane.

12. Gearbox according to one of the preceding claims, characterized in that the heat sink, in particular the fourth heat sink part and the third heat sink part, is or are designed as a continuous casting, in particular as an aluminum continuous casting, and / or that the fourth heat sink is flush with the bearing cover, in particular wherein the fourth 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.

13. Transmission according to one of the preceding claims, characterized in that the cooling fins of the fourth heat sink extend parallel to the splitting plane, and / or that thermal paste is arranged between the fourth heat sink and the bearing cover.

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

15. Gearbox according to one of the preceding claims, characterized in that the lower housing part has a third flat raw casting surface on at least one of its side walls, against which a third heat sink rests and is fastened, in particular fastened to the lower housing part with screws, in particular wherein the cooling fins of the third heat sink extend parallel to the splitting plane, in particular wherein thermal paste is arranged between the third heat sink and the lower housing part, and / or that the second heat sink is arranged between the two base parts, and / or that the first, second, third and fourth heat sinks are made of the first material, and / or that the first, second, third and fourth heat sinks are an aluminum extruded part.

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