Speed reducer with two-piece housing and cooling body

Abstract

The invention relates to a speed reducer having a housing, in which the housing has at least one through recess, in which a bearing is accommodated, a bearing cap is connected to the housing, the bearing cap covering the recess, in particular wherein the bearing cap rests on and / or is mounted on the outer side of the housing, and a fourth cooling body rests on and is connected to the bearing cap.

Description

Technical Field

[0001] The invention relates to a reducer with a housing. Background Art

[0002] As is known, the heat loss of the gear unit is dissipated into the ambient air through its housing.

[0003] As the latest prior art, a reduction gear having a split housing is known from DE 10 2009 014 314 A1.

[0004] A retarder arrangement is known from EP 2 686 583 B1.

[0005] DE 10 2022 003 369 A1 discloses a reduction gear having a housing lower part and a housing upper part seated on the housing lower part. Summary of the Invention

[0006] It is therefore an object of the present invention to further develop a reduction gear with improved heat dissipation.

[0007] According to the invention, this object is achieved by a reduction gear according to the features specified in claim 1 or 2 .

[0008] In a reduction gear having a housing, an important feature of the present invention is that the housing has a housing lower part and a housing upper part seated on the housing lower part.

[0009] The housing lower part has a flat first green casting surface / casting blank surface on its underside, in particular on its side facing away from the housing upper part, in particular on its bottom side, against which the first heat sink rests and is fastened, in particular by a single screw, to the housing lower part.

[0010] In particular, the flat first original casting surface is arranged concavely on the housing lower part, so that the first heat sink is arranged on the housing lower part in a torsionally fixed manner, in particular in a torsionally fixed manner about the screw axis of the screw,

[0011] In particular, the cooling ribs of the first heat sink are oriented parallel to the input shaft of the reducer or extend parallel to a dividing plane separating the housing lower part from the housing upper part.

[0012] In particular, a heat conducting paste is arranged between the first heat sink and the housing lower part.

[0013] In particular, the first original casting surface is oriented parallel to a dividing plane which separates the housing upper part from the housing lower part,

[0014] In particular, the first cooling element is embodied as a continuous casting, in particular, the continuous casting direction of the continuous casting is parallel to the extension direction of the cooling ribs and / or parallel to the direction of the rotation axis of the input shaft,

[0015] In particular, at least two of the cooling ribs of the first heat sink are interrupted twice or more in order to free up a space area for an actuating screw which passes through the first heat sink and is screwed into a threaded hole in the housing lower part, in particular into the bottom side of the housing lower part.

[0016] The advantage here is that channels for air flow can be formed on the bottom side. This allows for efficient heat dissipation. Furthermore, the first heat sink can be protected from external forces because the cooling ribs extend into the channels, which can be protected by the foot part and also by the housing bottom part.

[0017] According to the present invention, the channel is bounded by the foot member, the first heat sink, the housing lower part, and the base / ground on which the reducer is placed / standing. Furthermore, during operation of the reducer, the rotation of the gear element causes the oil present in the interior of the reducer to foam and mix with air. Only the oil sump, or the lowest area of ​​the oil, remains free of air. Consequently, heat conduction is improved in this lower area, and heat losses from the bearings and gear element to the oil are conducted further to the bottom of the speed reducer, and from there to the first heat sink. Therefore, arranging the first heat sink below the reducer housing allows for more efficient and improved heat dissipation from the reducer.

[0018] A single screw can also be used for fastening. This allows for quick and cost-effective installation of the first heat sink. However, to prevent the first heat sink from twisting, i.e., rotating about the screw's thread axis, even when using only a single screw, the contact surface of the first heat sink on the housing lower part is designed as a recess, with the edge of the recess formed by material that protrudes beyond the contact surface and thus forms a form-fitting boundary that prevents the first heat sink from twisting. Preferably, a chamfer is formed on the protruding material, acting as an introduction bevel. This simplifies the installation of the first heat sink. In particular, the chamfer is designed to completely and uninterruptedly circumnavigate the edge of the contact surface.

[0019] According to the invention, according to claim 2 or in an advantageous embodiment, two foot parts, each elongated on the housing lower part, in particular two foot parts, each elongated on the bottom side of the housing lower part, parallel to one another, protrude on the side of the housing lower part facing away from the housing upper part, and / or protrude on the housing lower part, in particular at the bottom side of the housing lower part, on the side of the housing lower part facing away from the housing upper part, in particular towards the base / ground, in particular further than the first heat sink.

[0020] In particular, the foot part is formed in one piece, in particular integrally, on the housing lower part.

[0021] In particular, the reducer can be placed on a substrate by means of the foot part.

[0022] The first heat sink is arranged between the two foot parts.

[0023] In particular, the cooling ribs of the first heat sink extend parallel to the foot element. This has the advantage that the foot element can be used to capture thermal capacity and, in addition, allows for a stable placement of the reducer. In this case, the foot element also serves as a channel boundary and a protective device for the first heat sink. Preferably, the foot element is designed as an elongated cube, in particular, with the longest extension parallel to the dividing plane and / or the axis of rotation of the input shaft and / or the extension direction of the cooling ribs of the first heat sink.

[0024] In an advantageous embodiment, a web region is integrally formed on the foot part, which web region projects from the foot part, in particular parallel to a dividing plane separating the housing lower part from the housing upper part.

[0025] The housing lower part is designed as a single piece with the foot part and the web region, in particular is formed integrally.

[0026] In particular, the web regions each protrude on a side of the respective foot element facing away from the first heat sink, in particular for contact with the substrate.

[0027] In particular, each web region has at least one through hole, in particular at least one through hole oriented parallel to the normal direction of the dividing plane. This has the advantage that a stable placement of the reducer can be achieved.

[0028] In an advantageous embodiment, the maximum distance of the cooling ribs from the flat first original casting surface is smaller than the maximum distance of the foot part from the flat first original casting surface. This has the advantage that the foot part protrudes from the first heat sink, in particular toward the base, i.e., downwards from the housing lower part.

[0029] In an advantageous embodiment, the continuous channel below the reducer is defined by the base surface on which the foot piece, the first heat sink and the reducer are placed. The advantage is that no additional expense is required to provide a channel for the cooling air flow.

[0030] In an advantageous embodiment, a first groove is introduced into each of the foot parts, into which a region protruding or projecting on the first heat sink, in particular a rail region, is pushed.

[0031] In particular, the maximum extension of the first cooling element in a direction perpendicular to the continuous casting direction or perpendicular to the direction of the rotation axis of the reducer input shaft, in particular in the transverse direction, is greater than the minimum distance between the two foot parts, in particular measured in this direction,

[0032] In particular, the two first grooves are oriented parallel to each other,

[0033] In particular, the first heat sink has a base region on which the cooling ribs of the first heat sink are cast and / or formed, wherein the base region projects toward the respective foot part on the first heat sink,

[0034] In particular, the first groove opens into the surroundings of the reducer parallel to the continuous casting direction, so that when assembling the reducer, the first heat sink can first be inserted and then tightened using, in particular, a single screw, which in particular passes through the first heat sink and can be screwed into a threaded hole in the housing lower part. This has the advantage of simplifying assembly by inserting the first heat sink into the first groove in a first manufacturing method step and then screwing the screw into the threaded hole in the housing lower part. Thus, in the first manufacturing method step, the first heat sink can be precisely introduced into a position from which the screw can then be screwed into the threaded hole in the housing lower part in a second manufacturing method step.

[0035] In an advantageous embodiment, a second groove is introduced into each of the foot parts, into which a region protruding or projecting on the second heat sink, in particular a rail region, is pushed.

[0036] wherein the respective second groove is not oriented coaxially with the respective first groove but rather has an angle of between 20° and 70° relative to the respective first groove,

[0037] In particular, the maximum extension of the second cooling body in a direction perpendicular to the continuous casting direction or perpendicular to the direction of the rotation axis of the reducer input shaft, in particular in the transverse direction, is greater than the minimum distance between the two foot parts, in particular measured in this direction,

[0038] In particular, the two second grooves are oriented parallel to each other,

[0039] In particular, the second heat sink has a base region on which the cooling ribs of the second heat sink are cast and / or formed, wherein the base region projects toward the respective foot part on the second heat sink,

[0040] In particular, the second groove opens into the surroundings of the reducer parallel to the continuous casting direction. This allows, in particular, the second heat sink to be initially inserted during assembly of the reducer and subsequently tightened using, in particular, a single screw, which in particular passes through the second heat sink and can be screwed into the second threaded hole in the housing lower part. This advantageously simplifies assembly by inserting the second heat sink into the second groove in an initial manufacturing method step and subsequently screwing the screw into the second threaded hole in the housing lower part. Thus, in the initial manufacturing method step, the second heat sink can be precisely introduced into a position where the screw can then be screwed into the second threaded hole in the housing lower part in a second manufacturing method step.

[0041] In an advantageous embodiment, the blower / fan is non-rotatably connected to the input shaft of the reducer. This has the advantage that the air flow can be generated by means of a passive blower. In particular, the air flow is generated only when the input shaft rotates.

[0042] In an advantageous embodiment, the input transmission stage of the reducer is an angular transmission stage / reversing transmission stage.

[0043] In particular, the angular transmission stage is a bevel gear transmission stage,

[0044] The housing lower part has a flat second original cast surface, against which the second heat sink rests and is fastened, in particular by means of screws, to the housing lower part.

[0045] The normal to the flat second original casting surface is oriented neither parallel nor perpendicular to the dividing plane, but rather at an angle of between 20° and 70° relative to the dividing plane. This has the advantage that the air flow is guided along the second heat sink and thus fed into the channel, the edges of which are formed by the first heat sink and the foot element.

[0046] In an advantageous embodiment, the housing lower part has a flat first green casting surface on its underside, in particular on its side facing away from the housing upper part, in particular on its bottom side, against which the first heat sink rests and is fastened, in particular by a single screw, to the housing lower part.

[0047] In particular, the flat first original casting surface is arranged concavely on the housing lower part, so that the first heat sink is arranged on the housing lower part in a rotationally fixed manner, in particular in a rotationally fixed manner about the screw axis of the screw,

[0048] In particular, the cooling ribs of the first heat sink are oriented parallel to the input shaft of the reducer or extend parallel to a dividing plane separating the housing lower part from the housing upper part.

[0049] In particular, a heat conducting paste is arranged between the first heat sink and the housing lower part.

[0050] In particular, the first original casting surface is oriented parallel to a dividing plane which separates the housing upper part from the housing lower part,

[0051] In particular, the first cooling element is designed as a continuous casting, in particular the continuous casting direction of the continuous casting is oriented parallel to the extension direction of the cooling ribs and / or parallel to the direction of the rotation axis of the input shaft,

[0052] In particular, the first cooling element is designed as a continuous casting, in particular the continuous casting direction of the continuous casting is oriented parallel to the extension direction of the cooling ribs and / or parallel to the direction of the rotation axis of the input shaft,

[0053] In particular, at least two of the cooling ribs of the first heat sink are interrupted twice or more to create space for actuating screws, which pass through the first heat sink and are screwed into threaded holes in the housing lower part, in particular, in the underside of the housing lower part. This has the advantage of simplifying assembly. To this end, a minimum number of screws can be selected, in particular, for example, only one screw can be used to secure the first heat sink. To ensure unimpeded access to the respective screws, at least two adjacent cooling ribs are interrupted, allowing tools for actuating the respective screws to use the free space created by the interruptions.

[0054] In an advantageous embodiment, two foot parts, each elongated and parallel to one another, are formed on the housing lower part, in particular on the bottom side of the housing lower part, respectively, and project on a side of the housing lower part facing away from the housing upper part, and / or two foot parts, each elongated and parallel to one another, are formed on the housing lower part, in particular on the bottom side of the housing lower part, respectively, and project on the side of the housing lower part facing away from the housing upper part, in particular towards the base, in particular further than the first heat sink.

[0055] In particular, the foot part is formed in one piece, in particular integrally, on the housing lower part.

[0056] In particular, the reducer can be placed on a substrate by means of the foot part.

[0057] The first heat sink is arranged between the two foot parts.

[0058] In particular, the cooling ribs of the first heat sink extend parallel to the foot pieces. This has the advantage that the first heat sink is arranged in a protected manner between the foot pieces. Furthermore, the foot pieces increase the thermal capacity of the housing lower part and direct part of the heat loss from the reducer toward the base.

[0059] In an advantageous embodiment, a web region is integrally formed on the foot part, which web region projects from the foot part, in particular parallel to a dividing plane separating the housing lower part from the housing upper part.

[0060] The housing lower part is designed as a single piece with the foot part and the web region, in particular is formed integrally.

[0061] In particular, the web regions each protrude on a side of the respective foot element facing away from the first heat sink, in particular for contact with the substrate.

[0062] In particular, each web region has at least one through-hole, in particular at least one through-hole oriented parallel to the normal of the dividing plane. This has the advantage that the web regions increase the standing surface of the housing lower part on the substrate and also increase the thermal capacity of the housing lower part. The corresponding holes further increase the surface area of ​​the corresponding web regions, thereby further improving heat dissipation. The web regions extend beyond the corresponding foot parts on the side facing away from the heat sink. This prevents the cooling channels of the air flow through the first heat sink from being constricted.

[0063] In an advantageous embodiment, the maximum distance of the cooling ribs from the flat first original casting surface is less than the maximum distance of the foot part from the flat first original casting surface. Advantageously, the base is spaced apart from the first cooling body and thus allows a sufficiently large amount of air to flow through.

[0064] In an advantageous embodiment, the continuous channel below the reducer is delimited by the foot piece, the first heat sink and the base surface on which the reducer is placed.

[0065] In an advantageous embodiment, the blower is connected to the input shaft of the reducer in a rotationally fixed manner. The advantage here is that a passive blower can be used to convey the air flow.

[0066] In an advantageous embodiment, the input transmission stage of the reducer is an angular transmission stage.

[0067] In particular, the angular transmission stage is a bevel gear transmission stage,

[0068] The housing lower part has a flat second original cast surface, against which the second heat sink rests and is fastened, in particular by means of screws, to the housing lower part.

[0069] The normal to the flat second original casting surface is oriented neither parallel nor perpendicular to the dividing plane, but rather at an angle between 20° and 70° relative to the dividing plane. This has the advantage that the air flow from the fan is not directed into the channel through a 90° angle, but through a smaller angle.

[0070] In an advantageous embodiment, the housing has at least one continuous recess in which a bearing, in particular a rolling bearing, is accommodated.

[0071] Among them, the bearing cover is connected to the housing.

[0072] wherein the bearing cover covers the recess, in particular wherein the bearing cover rests on and / or is mounted on an outer side of the housing,

[0073] It is characterized by:

[0074] The fourth heat sink rests against the bearing cover, in particular on a side of the bearing cover facing away from the housing, and is connected to the bearing cover, in particular by means of screws.

[0075] The advantage here is that improved heat dissipation can be achieved. In particular, the power loss of the bearing covered by the bearing cover can be effectively dissipated by the fourth heat sink.

[0076] In an advantageous embodiment, the fourth heat sink is made of a fourth material, and the housing is made of a third material.

[0077] The fourth material has a higher thermal conductivity than the third material.

[0078] Especially wherein, the fourth material is aluminum and / or the third material is steel or cast steel. Advantage is hereby improved heat dissipation to the environment.

[0079] In a kind of advantageous design, housing is formed by housing lower part and housing upper part that is seated on housing lower part.At this advantage, can reliably realize oil filling up to the upper edge of housing lower part.

[0080] In an advantageous embodiment, the dividing plane separates the housing lower part from the housing upper part.

[0081] In particular, the rotation axis of the input shaft of the reducer is contained in the dividing plane, and the rotation axis of the output shaft of the reducer is also contained in the dividing plane,

[0082] In particular, the rotation axis of the input shaft of the reducer is oriented perpendicularly to the rotation axis of the output shaft of the reducer,

[0083] In particular, the dividing 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 contact each other in the dividing plane. This has the advantage that oil filling up to the dividing plane can be achieved without the risk of leakage.

[0084] In an advantageous embodiment, the dividing plane intersects the bearing receptacle. This has the advantage that the bearing receptacle is divided and that the bearing accommodated therein, together with the associated shaft inserted therein, can therefore be inserted into the bearing receptacle from above.

[0085] In an advantageous embodiment, the fourth heat sink is formed by a fourth heat sink component and a third heat sink component, and the fourth heat sink component and the third heat sink component are separated by a dividing plane.

[0086] The bearing cover is designed as a single piece, in particular formed in one piece.

[0087] In particular, the dividing plane includes the contact area between the fourth heat sink component and the third heat sink component, and / or the fourth heat sink component and the third heat sink component are in contact with each other within the dividing plane. This has the advantage that only the lower of the two heat sink components can be retained, since the heat flow from the oil can still be dissipated sufficiently effectively, and the upper of the two heat sink components only needs to be provided when the maximum heat output is to be dissipated.

[0088] In an advantageous embodiment, the heat sink, in particular the fourth heat sink part and the third heat sink part, are designed as continuous castings, in particular aluminum continuous castings. This has the advantage that simple and cost-effective production can be achieved.

[0089] In an advantageous embodiment, the fourth heat sink is flush with the bearing cover.

[0090] Especially wherein, the fourth heat sink does not exceed and / or protrudes beyond the bearing cover in the lateral direction. Advantage is here that required structural space is very little and collision with other components can be avoided.

[0091] In an advantageous embodiment, the axis of rotation of the bearing covered by the bearing cover is the normal of a plane.

[0092] The vertical projection of the bearing cover in this plane completely includes the vertical projection of the heat sink. The advantage here is that the required construction space is very small and collisions with other components can be avoided.

[0093] In an advantageous embodiment, the cooling ribs of the fourth heat sink extend parallel to the dividing plane. This has the advantage that the cooling air flow of the fan connected to the input shaft in a rotationally fixed manner flows along the cooling ribs.

[0094] In an advantageous embodiment, a heat-conducting paste is arranged between the fourth heat sink and the bearing cover, which has the advantage that the heat conduction resistance can be reduced.

[0095] In an advantageous embodiment, the fourth cooling element rests against the fourth original casting surface of the bearing cap, which is designed to be flat. The advantage here is that the bearing cap can be manufactured simply.

[0096] In an advantageous alternative design, the fourth heat sink rests on a fourth, precast surface of the bearing cap, which is embodied as a raised surface. The raised surfaces extend into corresponding depressions in the heat sink and extend parallel to the dividing plane. This has the advantage of increasing the surface area, and the heat sink has corresponding depressions so that the depressions rest against the raised surfaces of the bearing cap, filling the area and forming contact. Advantageously, the raised surfaces extend parallel to the cooling ribs, allowing the heat sink to be manufactured as a continuous casting, with the continuous casting direction oriented parallel to the direction of extension of the raised surfaces. Providing the raised surfaces on the bearing cap involves very little additional effort, as the bearing cap can be manufactured as a cast part.

[0097] In an advantageous embodiment, the housing lower part has a planar third green cast surface on at least one of its side walls, against which the third heat sink rests and is fastened, in particular by means of screws, to the housing lower part.

[0098] In particular, the cooling ribs of the third heat sink extend parallel to the dividing plane,

[0099] In particular, a heat conducting paste is arranged between the third heat sink and the housing lower part. The advantage here is that the heat conduction resistance can be reduced.

[0100] In an advantageous embodiment, the input transmission stage of the reducer is an angular transmission stage.

[0101] In particular, the angular transmission stage is a bevel gear transmission stage,

[0102] The housing lower part has a flat second original cast surface, against which the second heat sink rests and is fastened, in particular by means of screws, to the housing lower part.

[0103] The normal to the flat second original casting surface is oriented neither parallel nor perpendicular to the dividing plane, but rather at an angle between 20° and 70° relative to the dividing plane. This has the advantage that the input shaft has the maximum rotational speed, and therefore a significant portion of the power losses in the input region are transferred to the housing. The second heat sink rests against the lower housing portion, specifically so that the area covered by the second heat sink in the direction of the input shaft's rotational axis overlaps the area covered by the input shaft in the direction of the input shaft's rotational axis. This allows for the maximum possible power losses to be dissipated from the input region to the second heat sink. In particular, the oblique orientation of the heat sink and the flat second original casting surface enables convection along the second heat sink even without a fan. In the presence of a fan, a portion of the conveyed air flow flows along the second heat sink as it passes between the base, the foot member, and the second heat sink. The channel thus formed by the base, the foot member, and the second heat sink opens into a first channel, which is connected to the first channel and is bounded by the base, the foot member, and the first heat sink.

[0104] In an advantageous embodiment, the housing lower part has a flat first original casting surface on its underside, in particular the bottom side, against which the first heat sink rests and is fastened, in particular by means of screws, to the housing lower part.

[0105] In particular, the cooling ribs of the first heat sink extend parallel to the dividing plane,

[0106] In particular, a heat conducting paste is arranged between the first heat sink and the housing lower part.

[0107] In particular, the first original casting surface is oriented parallel to the dividing plane. This advantageously allows the air flow conveyed by the fan to be guided through a channel formed by the first heat sink, the foot member, and the base on which the reducer is placed by means of the foot member. Consequently, the channel is located below the reducer. Preferably, the foot member is integrally formed with the housing lower part, in particular, integrally formed. The foot member projects beyond the first heat sink, so that the first heat sink is at a non-negligible distance from the base, and the reducer is placed on the base by means of the foot member.

[0108] In an advantageous embodiment, two foot parts, each of which is formed elongately on the housing lower part and is parallel to one another, project from the bottom side of the housing lower part toward the base, in particular so that the reducer can be placed on the base by means of the foot parts.

[0109] The first heat sink is arranged between the two foot parts. This has the advantage that an air channel is formed, through which an air flow driven by a blower that is non-rotatably connected to the input shaft can flow.

[0110] In an advantageous embodiment, the second heat sink is arranged between the two foot parts. This has the advantage that an air channel is formed, through which an air flow driven by a blower that is non-rotatably connected to the input shaft can flow.

[0111] In an advantageous embodiment, the third heat sink is a continuous casting of aluminum, which has the advantage that it can be manufactured simply and cost-effectively.

[0112] Further advantages are provided by the dependent claims. The invention is not limited to the feature combinations of the claims. Other suitable combinations of the claims and / or features of the individual claims and / or features of the description and / or features of the drawings will appear to a person skilled in the art, particularly from the objectives presented and / or from a comparison with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0113] The present invention will now be described in more detail based on schematic diagrams.

[0114] exist Figure 1 The reducer according to the present invention is shown in an oblique view.

[0115] exist Figure 2 The cooling element 1 of the reducer is shown in an oblique view.

[0116] exist Figure 3 The reducer is shown in a side view.

[0117] exist Figure 4 The reducer is shown in a front view. DETAILED DESCRIPTION

[0118] As shown in the figure, the reduction gear has a housing composed of an upper housing part 3 and a lower housing part 7 .

[0119] In order to accommodate the bearings of the shafts of the reduction gear, a recess is formed in the housing, which is covered and / or closed by a bearing cover 2 which is pressed onto the housing by means of screws.

[0120] The reducer housing is a split type, consisting of a lower portion and an upper portion seated on the lower portion. The housing lower component 7 serves as the lower portion, and the housing upper component 3 serves as the upper portion. The dividing plane between the housing upper component 3 and the housing lower component 7 is a horizontal plane. The dividing plane can also be referred to as the parting plane between the two housing components, namely, the housing upper component 3 and the housing lower component 7, and / or the contact plane where the housing upper component 3 and the housing lower component 7 come into contact.

[0121] The dividing plane divides the recess and thus the heat sink 1 into two parts. However, the bearing cover 2 is designed in one piece and covers the entire recess.

[0122] Therefore, although the one-piece, in particular integrally formed bearing shield 2 is arranged between the housing and the fourth heat sink 1 , the fourth heat sink 1 is in particular three-part and the parting surface is the same as in the housing of the reducer.

[0123] The fourth heat sink 1 is made of a fourth material having a higher thermal conductivity than the third material used to make the housing. Preferably, the fourth material is aluminum, and the third material is steel or a cast material.

[0124] The gear components of the reducer, which are fixedly mounted on the shafts so as to be fixed with respect to each other, mesh with each other and generate heat loss, which is then transferred to the lubricating oil in the interior of the reducer. Similarly, the bearings also generate heat loss, which is transferred to the lubricating oil.

[0125] In order to improve the heat dissipation from the lubricating oil to the ambient air, the fourth heat sink 1 is arranged on the bearing cover 2 .

[0126] The bearing cap 2 has a fourth hole pattern of threaded holes for screws, which are machined into the bearing cap 2. The fourth heat sink 1 has a plurality of through holes, which are arranged according to the same hole pattern as the fourth hole pattern.

[0127] The screws are each passed through one of the through-holes of the fourth heat sink 1 and are each screwed into one of the threaded holes.

[0128] The fourth heat sink 1 is preferably composed of two heat sink parts that are mirror-symmetrical to one another, in particular wherein the dividing plane serves as a mirror plane.

[0129] The fourth heat sink 1 has cooling ribs which are shaped parallel to one another and extend in the axial direction, ie in particular parallel to the axis of rotation of the input shaft of the reducer.

[0130] Each of the two heat sink components of the fourth heat sink 1 is manufactured as a continuous casting. To produce the through-holes, the cooling ribs of the corresponding heat sink component are interrupted. At least two adjacent cooling ribs are interrupted multiple times, since the corresponding through-holes are at the same distance from the dividing plane and the cooling ribs extend parallel to the dividing plane.

[0131] The three-piece design of the cooling element 1 makes it possible to selectively omit the upper cooling element component while still maintaining effective cooling. This is because, in the stationary state, the gear unit oil is preferably filled only to the dividing plane or slightly below it. Therefore, especially during operation, the lubricating oil that is heated preferably reaches the inner side of the lower half of the bearing shield 2, where it dissipates heat to the bearing shield 2. Although the input heat flow is distributed throughout the entire bearing shield 2, the majority of the heat flow flows via the shortest path, directly through the bearing shield 2 to the lower cooling element component. The lower cooling element component is made of a material with good thermal conductivity and, due to the cooling ribs and the resulting lower temperature, serves as a heat sink for the heat flow. The additional heat dissipation achieved by installing the upper cooling element component is advantageous when the gear unit is operated at high speeds and the oil therefore covers the inner side of the bearing shield 2 substantially evenly.

[0132] The three-part embodiment of the fourth heat sink 1 thus makes it possible to adapt the number of heat sink components to the operating mode of the retarder.

[0133] Preferably, the fourth heat sink 1 is flush with the bearing cover 2, in particular, the fourth heat sink 1 does not protrude beyond the bearing cover 2. This avoids interference with other components, such as shafts or screws protruding from the reducer or other bearing covers.

[0134] Although cooling ribs are integrally formed on the housing upper part 3 , i.e., the cooling ribs are made of the same material as the housing upper part 3 itself, the heat dissipation efficiency through these cooling ribs formed on the housing upper part 3 is not high because the material of the housing upper part 3 has a lower thermal conductivity than the material of the fourth heat sink 1 .

[0135] The bearing shield 2 is preferably produced as a cast part and has on its outer side a flat fourth original casting surface, against which the fourth heat sink 1 rests.

[0136] In order to reduce the heat transfer resistance from the bearing cover 2 to the fourth heat sink 1 , heat conducting paste is preferably introduced between the bearing cover 2 and the heat sink 1 .

[0137] The housing lower part 7 has a flat third original casting surface on at least one of its side walls, against which the third heat sink 4 rests and is again fastened by means of screws to the housing lower part 7. The cooling ribs of the third heat sink 4 extend in the axial direction, in particular parallel to the dividing plane.

[0138] The reducer has an angular transmission stage on the input side, preferably designed as a bevel gear stage. For this purpose, the housing is provided with an inclined surface below the input shaft, whose axis of rotation lies within the dividing plane. Specifically, the housing lower part 7 has a flat second, original casting surface against which the second heat sink 5 rests and is also fastened to the housing lower part 7 by means of a single screw. The normal to this inclined surface is oriented neither parallel nor perpendicular to the dividing plane, but rather at an angle, in particular, between 20° and 70° relative to the dividing plane.

[0139] On the bottom side of the housing lower part 7, i.e., on the side facing away from the housing upper part 3, the housing lower part 7 also has a flat first green cast surface on at least one of its side walls, against which the first heat sink 30 rests and is fastened by means of screws to the housing lower part 7. The cooling ribs of the first heat sink 30 extend in the axial direction, i.e., in particular, parallel to the dividing plane.

[0140] Two mutually parallel foot parts 6 , each formed elongated on the housing lower part, project from the bottom side of the housing lower part 7 toward the base, so that the reduction gear can be placed on the base by means of the foot parts 6 .

[0141] The second heat sink 5 is arranged between two foot parts 6 .

[0142] The first heat sink 30 is arranged between the two foot parts 6 .

[0143] A heat conducting paste is further arranged between the third heat sink 4 , the second heat sink 5 and the first heat sink 30 and the corresponding original casting surfaces, in particular for reducing heat conduction resistance.

[0144] In particular, all cooling bodies ( 1 , 4 , 5 , 30 ) are embodied as aluminum continuous castings.

[0145] The axis of rotation of the output shaft of the reducer is preferably contained in the dividing plane.The dividing plane therefore separates the bearing receptacle for the bearing of the reducer shaft, which is configured on the housing of the reducer.

[0146] The foot part 6 is designed as a single piece with the housing lower part 7 , in particular is formed integrally, and extends parallel to the rotation axis of the input shaft.

[0147] In the first heat sink 30 , the cooling ribs are also interrupted several times in order to provide free space for access to connecting screws, which pass through the first heat sink and are screwed into threaded holes in the housing lower part 7 , in particular on its underside, in particular bottom side.

[0148] On each of the two foot parts 6, a web area 8, in particular a shoe area, spaced apart from one another is formed, which protrudes laterally, in particular perpendicularly to the axis of rotation of the input shaft and at a constant distance from the dividing plane and / or parallel to the dividing plane, and thus provides an enlarged base surface when the reducer is positioned.

[0149] Each of the web regions 8 has, in particular, a vertical through-hole through which a fastening screw can be passed and screwed into a corresponding threaded hole. Furthermore, the web regions improve heat dissipation by increasing the thermal capacity and by increasing the surface area and by contact with the substrate, which can be made of metal, for example, and is therefore able to absorb and dissipate significant heat flows.

[0150] In a further embodiment according to the invention, a simplified installation of the first cooling body 30 is achieved. For this purpose, rail regions extending parallel to the continuous casting direction extend on both sides of the first cooling body 30 perpendicular to the continuous casting direction of the first cooling body embodied as an aluminum continuous casting.

[0151] Each of the two rail regions projects into the first groove of the corresponding foot part 6. Thus, during assembly, the first heat sink 30 can first be pushed into the first groove and then secured by means of the screw or screws that are screwed into threaded holes on the underside of the housing lower part 7. Since the rail regions are received in the first grooves, the first heat sink 30 is secured in a positively locking manner in the vertical direction; the screws press the first heat sink flatly against the underside of the housing lower part 7.

[0152] Since the first cooling body manufactured as a continuous casting has a plate-shaped base area, onto which the cooling ribs are cast, the continuous casting only needs to be cut at the edge so that the base area protrudes on both sides toward the foot part 6 and the cooling rib closest to the respective foot part 6 has a greater distance from the respective foot part 6 adjacent to it than the base area.

[0153] The extension of the base area in the transverse direction, i.e. perpendicular to the continuous casting direction and / or the direction of the rotation axis of the input shaft of the reducer, is greater than the distance between the two foot parts 6, in particular the distance between the two foot parts 6 measured in the transverse direction, in particular the minimum distance.

[0154] Therefore, one of the first grooves is arranged in each of the two foot parts 6 , into which the base region projects. Thus, during assembly, in a first manufacturing method step, the first heat sink 30 can be pushed into the foot part 6 of the housing lower part 7 via the protruding region of its base region, which serves as a rail—i.e., the rail region of the first heat sink. Subsequently, in a second manufacturing method step, the first heat sink does not need to be erected for screwing in. Instead, the first heat sink is already in a vertical position, from which the screws can be screwed in. Prior to the first manufacturing method step, the base region of the first heat sink is previously coated with thermal paste, so that, at the latest in the second manufacturing method step, the thermal paste is squeezed between the first heat sink 3 and the housing lower part 7 .

[0155] Preferably, the second heat sink 5 is also embodied with a protruding base area so that it can be pushed into a corresponding second groove of the foot part 6, however, the second groove is not oriented parallel to the first groove, but has an angle between 0° and 90° relative to the first groove.

[0156] Preferably, the second groove opens into the first groove. Thus, a simple production of the groove can be achieved.

[0157] In another embodiment according to the present invention, the fan impeller is non-rotatably connected to the input shaft, so that the air flow delivered by the fan flows along the cooling ribs of the fourth cooling body 1, along the cooling ribs of the third cooling body 4, along the cooling ribs of the second cooling body 5 and along the cooling ribs of the first cooling body 30.

[0158] In another embodiment according to the present invention, the first heat sink 30 is fastened to the housing lower part 7 by only a single screw, rather than multiple screws. In order to prevent the orientation of the first heat sink 30 from being twisted during installation, the flat original casting surface against which the heat sink 30 rests is arranged in a concave manner on the housing lower part 7.

[0159] List of reference numerals:

[0160] 1Fourth cooling body

[0161] 2 bearing caps

[0162] 3 Upper shell part

[0163] 4Third cooling body

[0164] 5 Second cooling body

[0165] 6-pin components

[0166] 7 Lower housing part

[0167] 8. Plate area, especially shoe area

[0168] 30 first cooling body.

Claims

1. A reducer having a housing, in particular a reducer having a housing that can be placed on a substrate, The housing comprises a housing lower part and a housing upper part seated on the housing lower part. The housing lower part has a flat first green casting surface on its underside, in particular on its side facing away from the housing upper part, in particular on its bottom side, against which the first heat sink lies and is fastened, in particular by a single screw, to the housing lower part. Especially among them, The flat first original casting surface is arranged concavely on the housing lower part, so that the first heat sink is arranged on the housing lower part in a torsionally fixed manner, in particular in a torsionally fixed manner about the screw axis of the screw, In particular, the cooling ribs of the first heat sink are oriented parallel to the input shaft of the reducer or extend parallel to a dividing plane separating the housing lower part from the housing upper part. In particular, a heat conducting paste is arranged between the first heat sink and the housing lower part. In particular, the first original casting surface is parallel to a dividing plane which separates the housing lower part from the housing upper part, In particular, the first cooling element is embodied as a continuous casting, and in particular, the continuous casting direction of the continuous casting is parallel to the extension direction of the cooling ribs and / or parallel to the direction of the rotation axis of the input shaft. In particular, at least two of the cooling ribs of the first heat sink are interrupted twice or more in order to free up space for actuating screws which 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.

2. A reducer having a housing, The housing comprises a housing lower part and a housing upper part seated on the housing lower part. The housing lower part has a flat first green casting surface on its underside, in particular on its side facing away from the housing upper part, in particular on its bottom side, against which the first heat sink lies and is fastened, in particular by a single screw, to the housing lower part. Especially among them, The flat first original casting surface is arranged concavely on the housing lower part, so that the first heat sink is arranged on the housing lower part in a torsionally fixed manner, in particular in a torsionally fixed manner about the screw axis of the screw, In particular, the cooling ribs of the first heat sink are oriented parallel to the input shaft of the reducer or extend parallel to a dividing plane separating the housing lower part from the housing upper part. In particular, a heat conducting paste is arranged between the first heat sink and the housing lower part. In particular, the first original casting surface is oriented parallel to a dividing plane separating the housing lower part from the housing upper part, In particular, the first cooling element is embodied as a continuous casting, and in particular, the continuous casting direction of the continuous casting is parallel to the extension direction of the cooling ribs and / or parallel to the direction of the rotation axis of the input shaft. In particular, at least two of the cooling ribs of the first heat sink are interrupted twice or more in order to free up space for actuating screws which penetrate 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. In this case, a first groove is formed in the foot part of the housing lower part, into which a region protruding or projecting on the first heat sink, in particular a rail region, is inserted.

3. The reducer according to claim 1 or 2, characterized in that: Two elongated, mutually parallel foot parts, each formed on the housing lower part, in particular on the bottom side of the housing lower part, project on a side of the housing lower part remote from the housing upper part, and / or project on the housing lower part, in particular on the bottom side of the housing lower part, on a side of the housing lower part remote from the housing upper part, in particular towards the substrate, in particular further than the first heat sink, In particular, the foot part is integrally formed, in particular integrally, on the housing lower part. In particular, the reducer can be placed on a substrate by means of the foot part. The first heat sink is arranged between the two foot parts. In particular, the cooling ribs of the first heat sink extend parallel to the foot element.

4. The reducer according to any one of the preceding claims, characterized in that A web region is integrally formed on the foot part, which web region projects from the foot part, in particular parallel to a dividing plane separating the housing lower part from the housing upper part. The housing lower part is designed as a single piece with the foot part and the web region, in particular is formed in one piece. In particular, the web regions each protrude on a side of the respective foot element facing away from the first heat sink, in particular for contact with the substrate. In particular, each web region has at least one through-hole, in particular at least one through-hole oriented parallel to the normal direction of the separating plane.

5. The reducer according to any one of the preceding claims, characterized in that: The maximum distance of the cooling ribs from the first flat original casting surface is smaller than the maximum distance of the foot part from the first flat original casting surface.

6. The reducer according to any one of the preceding claims, characterized in that: The continuous channel below the speed reducer is delimited by the foot member, the first cooling body, and the base surface on which the speed reducer is placed.

7. The reducer according to any one of the preceding claims, characterized in that: A first groove is formed in each foot part, into which a region protruding or bulging on the first heat sink, in particular a rail region, is inserted. In particular, the maximum extension of the first cooling body in a direction perpendicular to the continuous casting direction or perpendicular to the direction of the rotation axis of the input shaft of the reducer, in particular in the transverse direction, is greater than the minimum distance between the two foot parts, in particular measured in this direction, In particular, the two first grooves are oriented parallel to each other, In particular, the first heat sink has a base region, on which the cooling ribs of the first heat sink are cast and / or formed, the base region protruding on the first heat sink toward the respective foot part, In particular, the first groove extends into the surrounding environment of the reducer parallel to the continuous casting direction, so that when assembling the reducer, the first cooling body can first be pushed in and then tightened by a screw, in particular a single screw, in particular, the screw passes through the first cooling body and can be screwed into the threaded hole of the lower part of the housing.

8. The reducer according to any one of the preceding claims, characterized in that: A second groove is formed in each foot part, into which the protruding or convex region on the second heat sink, in particular the rail region, is inserted. the respective second groove is not oriented coaxially with the respective first groove but has an angle of between 20° and 70° relative to the respective first groove, In particular, the maximum extension of the second cooling body in a direction perpendicular to the continuous casting direction or perpendicular to the direction of the rotation axis of the input shaft of the reducer, in particular in the transverse direction, is greater than the minimum distance between the two foot parts, in particular measured in this direction, In particular, the two second grooves are oriented parallel to each other, In particular, the second heat sink has a base region, on which the cooling ribs of the second heat sink are cast and / or formed, which base region projects toward the respective foot part on the second heat sink, In particular, the second groove extends into the surrounding environment of the reducer parallel to the continuous casting direction, so that when assembling the reducer, the second cooling body can first be pushed in and then tightened by a screw, in particular a single screw, in particular, the screw passes through the second cooling body and can be screwed into a threaded hole in the lower part of the housing.

9. The reducer according to any one of the preceding claims, characterized in that: The fan and the input shaft of the reducer are connected in a non-rotatable manner. and / or The input transmission stage of the reducer is the angular transmission stage. Especially among them, The angular transmission stage is a bevel gear transmission stage, The housing lower part has a flat second original cast surface, against which the second heat sink rests and is fastened, in particular by means of screws, to the housing lower part. The normal to the flat second original casting surface is oriented neither parallel nor perpendicular to the dividing plane, but rather at an angle of between 20° and 70° relative to the dividing plane.

10. The reducer according to any 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 accommodated. The bearing cover is connected to the housing. The bearing cover covers the recess, in particular wherein the bearing cover rests on and / or is mounted on the outer side of the housing, It is characterized by: The fourth heat sink rests against the bearing cover, in particular on a side of the bearing cover facing away from the housing, and is connected to the bearing cover, in particular by means of screws.

11. The reducer according to any one of the preceding claims, characterized in that The fourth heat sink is made of the first material, and the housing is made of the second material. 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 The dividing plane separates the housing lower part from the housing upper part. In particular, the rotation axis of the input shaft of the reducer is contained in the dividing plane, and the rotation axis of the output shaft of the reducer is also contained in the dividing plane. In particular, the rotation axis of the input shaft of the reducer is perpendicular to the rotation axis of the output shaft of the reducer, In particular, the dividing plane comprises a contact region between the housing lower part and the housing upper part, and / or the housing lower part and the housing upper part contact one another in the dividing plane, and / or The dividing plane intersects the bearing housing. and / or The fourth heat sink is formed by a fourth heat sink component and a third heat sink component, and the fourth heat sink component and the third heat sink component are separated by a dividing plane. The bearing cap is designed as a single piece, in particular is formed as a single piece, In particular, the dividing plane includes a contact region between the fourth heat sink component and the third heat sink component, and / or the fourth heat sink component and the third heat sink component are in contact with each other in the dividing plane.

12. The reducer according to any one of the preceding claims, characterized in that The heat sink, in particular the fourth heat sink part and the third heat sink part, are embodied as continuous castings, in particular aluminum continuous castings, and / or The fourth cooling body is flush with the bearing cover. Especially among them, The fourth cooling body (1) does not extend beyond the bearing cover and / or does not protrude beyond the bearing cover (2) in the lateral direction. and / or The axis of rotation of the bearing covered by the bearing cap is the normal of a plane. The vertical projection of the bearing cover in this plane completely encompasses the vertical projection of the cooling body.

13. The reducer according to any one of the preceding claims, characterized in that The cooling ribs of the fourth heat sink extend parallel to the dividing plane. and / or Heat-conducting paste is arranged between the fourth heat sink and the bearing cover.

14. The reducer according to any one of the preceding claims, characterized in that The fourth cooling element rests on the fourth original casting surface of the bearing cap which is designed to be flat. or The fourth heat sink bears against a fourth original cast surface of the bearing cap, which is embodied with elevations, which extend into corresponding depressions in the heat sink and extend parallel to the dividing plane.

15. The reducer according to any one of the preceding claims, characterized in that The housing lower part has a planar third green cast surface on at least one of its side walls, against which the third heat sink rests and is fastened, in particular by means of screws, to the housing lower part. In particular, the cooling ribs of the third heat sink extend parallel to the dividing plane, In particular, a heat conducting paste is arranged between the third heat sink and the housing lower part. and / or The second heat sink is arranged between the two foot parts. and / or The first heat sink, the second heat sink, the third heat sink and the fourth heat sink are made of a first material, and / or The first heat sink, the second heat sink, the third heat sink and the fourth heat sink are aluminum continuous castings.

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