Reduction gear with fan device

Abstract

The invention relates to a reduction gear having a fan device, wherein the fan device has a fan wheel, a housing and a grille, the fan wheel is connected to the input shaft of the reduction gear in a rotationally fixed manner, the housing is fixed on a holding frame, in particular of a multipart design, the holding frame is fixed on the housing of the reduction gear, the grille is formed by two grille parts, a first separation line of the two grille parts is a straight line or is formed by two straight lines aligned with one another, the housing is formed by two housing parts, a second separation line of the two housing parts is a planar curve composed of straight line segments.

Description

Technical Field

[0001] This invention relates to a speed reducer with a fan assembly. Background Technology

[0002] It is generally known that fan units can be used to cool equipment.

[0003] As the closest prior art, a fan impeller and a fan shroud are known from DE 10 2008 010 912 A1, the fan shroud having a fan grille integrally constructed (i.e. integrated) on the fan shroud.

[0004] A drive device is known from DE 10 2005 031 197 A1.

[0005] A force transmission device is known from DE 11 2014 000 834 T5.

[0006] A cooling device for a speed reducer is known from DE 10 2008 017 755 A1.

[0007] As the closest prior art, a wind turbine impeller is known from DE 10 2007 009 366 A1.

[0008] An air-cooled reducer unit is known from GB 436 416 A.

[0009] Air cooling for a gearbox used in packaging is known from US 4,872,502 A.

[0010] A drive device with a fan is known from DE 10 2005 031 197 A1.

[0011] A power transmission device is known from US 2014 / 0 338 495 A1.

[0012] A speed reducer with a liquid cooler is known from US 2011 / 0 179 903 A1.

[0013] A system for securing an internal air deflector plate to an air deflector shroud for an electric motor is known from DE 11 2013 007 680 T5. Summary of the Invention

[0014] Therefore, the object of the present invention is to improve a speed reducer with a fan assembly, wherein it should be easy and cost-effective to manufacture.

[0015] According to the present invention, this objective is achieved by a speed reducer with the features described in claim 1.

[0016] An important feature of this invention in a reducer with a fan assembly is that the fan assembly includes a fan impeller, a shroud, and a grille.

[0017] The fan impeller is connected to the input shaft of the reducer in a manner that prevents relative rotation.

[0018] The fan cover is fixed to a multi-piece retaining frame, which is fixed to the gearbox housing.

[0019] The fan cover is formed by two cover components.

[0020] In this configuration, the first cover component is adjacent to the cover member, which is supported and / or held by at least one connecting plate connected to and / or fixed to the housing of the reducer.

[0021] In particular, the area covered by the cover in the axial direction is spaced apart from, or adjacent to, the area covered by the first cover in the axial direction.

[0022] In particular, the axial direction is the direction of the rotation axis of the input shaft.

[0023] In particular, the fan shroud and cover are arranged and shaped such that the fan shroud and cover guide a portion of the airflow delivered by the fan between the housing and the cover of the reducer. In particular, the circumferential corner area covered by the first grille in the circumferential direction is adjacent to, but in particular, non-overlapping / non-intersecting with, the circumferential corner area covered by the second grille in the circumferential direction, and the circumferential corner area covered by the first cover member in the circumferential direction is adjacent to, but in particular, non-overlapping with, the circumferential corner area covered by the first grille in the circumferential direction overlaps with the circumferential corner area covered by the first cover member.

[0024] The advantage here is that while the shroud components of the fan shroud are held by a retaining frame, the cover, which functionally serves as an axial extension of the fan shroud, does not need to be held by a retaining frame but is fixed and held to the gearbox housing. Optionally, although the cover can be connected to one of the shroud components to achieve the highest possible seal between the cover and the fan shroud and to keep the loss of the delivered airflow very low, this connection is unsupported because otherwise the retaining frame would have to exert excessive support force and the support force for the cover would have to be transmitted through the shroud components. According to the invention, the shroud components can be manufactured with very little mass and material and can therefore be supported by the retaining frame without special expense. The cover can be fixed and supported to the gearbox housing by means of a connecting plate. That is, the cover is not constructed to be cantilevered. The disadvantage here is that threaded holes for fixing the cover must be introduced into the housing. However, the advantage here is that the cover can be made of thin metal sheet or plastic. Because even the shroud components and the cover can be manufactured as bent parts from steel sheet, a cost-effective implementation is achieved. Furthermore, the fixation of the cover to the housing and the separation of the cover from the enclosure components result in a lower tendency for vibration and thus greater stability.

[0025] The cover guides a portion of the airflow delivered by the fan along the gearbox housing. This allows for better heat dissipation of the gearbox. To this end, the cover is shaped such that a portion of the airflow, held by a connecting plate fixed to the gearbox housing, passes between the gearbox housing and the cover.

[0026] In a favorable design, the grille is formed by two grille elements.

[0027] Each grille element is connected to each of the two cover components, specifically by means of threaded connections. In particular, the first grille element is connected not only to the first cover component but also to the second cover component, and the second grille element is connected not only to the first cover component but also to the second cover component. The advantage here is that the stability of the fan cover is improved by means of the grille elements used as connectors. Therefore, resonance of the fan cover is also suppressed. However, the disadvantage is that assembly is complex.

[0028] In an advantageous design, the surface area of ​​the reducer housing that connects to the connecting plate is constructed to be flat and thus included within the first plane.

[0029] The contact area of ​​the cover plate or the connecting area adjacent to the connecting plate is constructed to be flat and therefore included in the second plane.

[0030] The first plane has a non-zero angle with respect to the second plane, particularly the normal direction of the first plane relative to the normal direction of the second plane, meaning they are oriented non-parallel to each other. An advantage here is that the connecting plate can be implemented as an angular member, allowing the cover to be connected to the housing even though it is not oriented parallel to the surface area of ​​the housing. The connecting plate bridges and thus connects the cover to the housing, wherein, to press the connecting plate onto the housing, a threaded member is screwed into a threaded hole in the housing, and the threaded head of the threaded member presses the connecting plate against the housing. This reduces the tendency for vibration.

[0031] In one advantageous design, the connecting plate is made into a bent part.

[0032] In particular, the connecting plate and the cover are connected by a threaded component. The threaded head of the component presses the cover and the connecting plate against a nut, and the threaded component is screwed into the nut. An advantage here is that the connecting plate can be made as a separate sheet metal part, allowing the threaded component to be guided through a long hole in the connecting plate and thus easily compensating for tolerances. This reduces the tendency for vibration.

[0033] In another advantageous design, the connecting plate and the cover are constructed as a single piece, particularly integrally formed, especially as a single piece, particularly integrally formed on the cover as a bending region. The advantage here is that it allows for further reduction in vibration tendency and a reduction in the number of parts. However, the cover needs to be manufactured with small tolerances and / or high quality.

[0034] In one advantageous design, the threaded head of the threaded part, screwed into the threaded hole of the housing, presses the connecting plate against the housing. The advantage here is that the cover can be secured simply and cost-effectively.

[0035] In one advantageous design, the cover is connected to the first cover component. The advantage here is that only a small portion of the airflow is lost and the tendency for vibration is reduced.

[0036] In an advantageous design, the area covered by the cover member in the axial direction is adjacent to and / or spaced apart from the area covered by the first cover member in the axial direction. The advantage here is a reduced vibration tendency because the cover member and the first cover member are vibrationally decoupled. Therefore, the overall vibration tendency is reduced.

[0037] In a favorable design, the grille is formed by two grille elements, the first separating line / dividing line of which is a straight line, or formed by two straight lines aligned with each other.

[0038] The cover is formed by two cover components, and the second separation line of the cover components is a planar curve composed of straight line segments.

[0039] One advantage here is the ease of manufacturing. Because the grille pieces are much smaller compared to a one-piece grille. Similarly, the cover components can be easily manufactured from sheet metal through stamping and bending.

[0040] By arranging the two separation lines non-parallel to each other, greater stability can be achieved, especially in preventing mechanical vibrations.

[0041] In one advantageous design, the grilles are each shaped as polygons on their respective outer peripheries, such that the contact surfaces between the respective grilles and the respective cover components are each composed of flat surface segments. The advantage here is that a stable connection between the grilles and the cover components can be established by means of threaded components, and resonance can be suppressed.

[0042] In an advantageous design, a first separation line and the rotation axis of the input shaft define a first plane, and a second separation line and the rotation axis of the input shaft define a second plane, wherein the second plane is oriented perpendicularly to the first plane or at least has an angle between 30° and 90°. The advantage here is that higher stability can be achieved and thus vibration tendency can be suppressed.

[0043] In an advantageous design, the cover formed by two cover components is shaped such that it has an axially through opening, specifically centered with respect to the input shaft. The advantage here is that the cover components each have very small mass and the two grille members can be used as fan cover grilles. Therefore, not only the cover components but also the grille members can be made into bent parts, where efficient sheet metal utilization can be achieved during stamping.

[0044] In one advantageous design, a corresponding connecting plate area extending into the opening is constructed on the cover component, which is made of sheet metal and bent into shape. A first or second grating member is fixed to this connecting plate area, particularly by means of threaded fasteners. The advantage here is that simple and reliable fixing of the grating member can be achieved.

[0045] In one advantageous design, a corresponding connecting plate area extending into the opening is constructed on the cover component, which is made of sheet metal and bent. A first or second grille is fixed to this connecting plate area, particularly by means of a threaded component. Specifically, a nut is welded to the corresponding connecting plate area to provide a threaded hole for the threaded component. The advantage here is that the cover component can be provided simply and cost-effectively, requiring only the grille to be screwed on.

[0046] In one advantageous alternative design, on a cover component made of sheet metal and bent into shape, a corresponding frame member welded to the inner side of the respective cover component extends into an opening, and a first or second grille member is fixed to this frame member, particularly by means of threaded fasteners.

[0047] In particular, nuts are welded to the frame members to provide threaded holes for the threaded parts. An advantage here is that the cover component is reinforced by the strut-shaped frame members and therefore is impact-resistant.

[0048] In a favorable design, the opening is particularly completely covered by a grille, especially by two grille members.

[0049] In particular, this type of coverage allows axially incoming airflow to pass through the grille. An advantage of this is that the grille openings are small enough to prevent a person's hand from reaching through.

[0050] In an advantageous design, the two grille members are in contact with each other along the first separation line or are less than 5 mm apart.

[0051] In an advantageous design, the two cover components are in contact with each other along the second separation line or are less than 5 mm apart. The advantage here is that either there is contact along the separation line or, alternatively, only a very small distance exists, preventing a person's hand from reaching across.

[0052] In an advantageous design, the airflow delivered by the fan impeller flows out between the reducer's housing and shroud, particularly in a directional manner, such that the airflow moves along the reducer's housing. The advantage here is that the reducer is cooled as effectively and evenly as possible.

[0053] In one advantageous design, the cover has end sides that are irregularly polygonal in shape in the circumferential direction.

[0054] In particular, the radial outer periphery of this end side of the cover is irregularly polygonal in shape. The advantage here is that, although a circular fan is used for a square reducer, the airflow still flows along the reducer in a manner that is distributed as evenly as possible along the periphery.

[0055] In one advantageous design, the cover components and / or grille components are manufactured as bent parts. The advantage here is that simple and cost-effective manufacturing is achieved.

[0056] In an advantageous design, an anti-interference element is fixed on each cover component, particularly on the inner wall of each cover component, and this anti-interference element is arranged between the cover component and the housing of the reducer.

[0057] The anti-interference section has a through-type grille opening.

[0058] Furthermore, it is particularly affected by the airflow conveyed by the fan impeller. This has the advantage of preventing interference with the airflow direction opposite to that conveyed by the fan impeller. Additionally, the anti-interference component is installed on the inner wall of the cover assembly. Therefore, direct connection to the reducer is not required.

[0059] In one advantageous design, each cover component has a radially through notch, which is shaped as a slot, elongated hole, or ellipse, wherein the longest extension dimension of the respective notch is oriented in the axial direction.

[0060] One advantage here is that air can flow radially, especially when objects or devices arranged very close to the grille make axial flow difficult or obstruct it. Therefore, contact protection against contact with rotating parts is also achieved.

[0061] In an advantageous design, each grille element has a uniform and / or regular flat grille formed by multiple, particularly hexagonal, notches, or grille openings, axially penetrating the respective grille element. The advantage here is that as much airflow as possible can flow in axially with the lowest possible air resistance. Preferably, the flow resistance generated by the respective grille element is very small. Nevertheless, contact protection against contact with rotating parts is still achieved.

[0062] Other advantages are derived from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, especially for purposes presented and / or by comparison with the prior art, other reasonable combinations of claims and / or individual claim features and / or specification features and / or drawing features are apparent. Attached Figure Description

[0063] The invention will now be explained in detail with reference to the schematic diagram:

[0064] Figure 1 A speed reducer according to the invention, having a fan arranged on the input side, is shown in oblique view.

[0065] Unlike Figure 1 , Figure 2 The first cover component 1 and the second grille component 4 are hidden.

[0066] Unlike Figure 2 , Figure 3 The blower components arranged outside the housing 5 of the reducer are shown in an exploded view, in which the retaining frame implemented as a two-piece structure can be seen.

[0067] Unlike Figure 1 , Figure 4 The blower components arranged outside the housing 5 of the reducer are shown in an exploded view.

[0068] Figure 5 The speed reducer is shown in a perspective view as another embodiment.

[0069] Figure 6One of the two block segments holding frame 32 is shown in a perspective view. Detailed Implementation

[0070] As shown in the figure, the reducer has an input shaft 6, which is rotatably supported in the reducer housing 5 by means of bearings.

[0071] The fan impeller 20 is connected to the input shaft 6 of the reducer in a non-rotatable manner and is surrounded by a cover assembly, which is fixed to a retaining frame 32 on the housing 5 of the reducer. The retaining frame 32 is multi-piece, especially two-piece, and is fixed to the housing 5 by means of fastening screws.

[0072] The cover assembly has a first cover component 1 and a second cover component 2, both of which are screwed onto the retaining frame 32 by means of threaded parts.

[0073] Here, each of the two cover components (1, 2) covers a 180° circumferential angle relative to the rotation axis of the input shaft 6. In the embodiment shown in the figure, the separation line between the two cover components (1, 2) extends vertically.

[0074] The two shroud components (1, 2) thus form a fan shroud that guides the airflow delivered by the fan impeller 20, causing the airflow to exit from the fan shroud 20 along the housing 5. The housing 5 of the reducer is roughly square. However, since the fan impeller 20 is circular, the fan shroud formed by the two shroud components (1, 2) arranged as close as possible to each other or at least very close to each other has a polygonal perimeter. Therefore, the airflow exiting between the fan shroud and the housing 5 is almost independent of the circumferential angle. In other words, the airflow exiting from the air shroud is distributed as evenly as possible in the circumferential direction. As a result, optimal cooling effect can be achieved. At this time, although the circular fan impeller 20 preferably does not extend to the corners of the cuboid, but only to the straight sides, the fan shroud also extends to the corners, and thus also deflects the exiting airflow to the corner areas of the cuboid.

[0075] Each cover component 1, 2 is implemented as a punched or bent part, in particular as a bent part, such that each cover component has an area on its periphery with multiple notches that allow air to pass through, the area allowing airflow from the radial direction to enter the fan cover.

[0076] Here, the radial direction is referenced to the axis of rotation of the input shaft.

[0077] The cover formed by the two cover components (1, 2) is shaped such that the cover has an axially through opening that is centrally located. In addition, a connecting plate area extending into the opening is formed on the cover component (1, 2) which is made of sheet metal and is bent. A first or second grid member (3, 4) is fixed to these connecting plate areas, especially by means of threaded members.

[0078] Therefore, the opening is completely covered by grille members 3 and 4. The axially entering airflow passes through the fan grille thus formed.

[0079] To provide threaded holes for the threaded fittings that connect the grid members (3, 4) to the connecting plate areas of the cover members (1, 2), nuts are welded to the connecting plate areas. Thus, the grid members (3, 4) can be tightened by means of the threaded fittings that axially penetrate the corresponding connecting plate areas and are screwed into the nuts, with the threaded head of the threaded fittings pressing the corresponding grid members against the corresponding connecting plate areas.

[0080] The two grid pieces 3 and 4 are in contact along a straight line, or are less than 5 mm apart along a straight line. Here, this straight line is also referred to as the first separation line.

[0081] The first separation line and the rotation axis of the input shaft define the first plane.

[0082] The first cover component 1 contacts the second cover component 2 along a planar curve, or along a planar curve at a distance of less than 5 mm. Here, this planar curve is also referred to as the second separation line.

[0083] The second separating line consists of multiple straight line segments.

[0084] The second separation line and the rotation axis of the input shaft define the second plane.

[0085] The second plane is not parallel to the first plane, but is preferably perpendicular to the first plane or has at least an angle between 30° and 90°.

[0086] This achieves improved stability because the cover components (1, 2) and the grid components (3, 4) are made of bent metal sheets. Therefore, the risk of resonance is avoided or prevented by this angle.

[0087] The grille members (3, 4) each have a preferably regular grille, not shown in the figure, formed by multiple through notches. Therefore, airflow can pass through axially and be drawn to the fan.

[0088] An anti-interference part 31 is arranged on the inner side of the first cover component 1. The air flow delivered by the fan can pass through the anti-interference part and leave in a manner that is oriented by the first protective cover 1 so that the air flow flows along the outside of the reducer.

[0089] In addition, the first cover component 1 has a semi-circular notch, such that the bearing cover section extending axially toward the notch from the bearing cover covering the input shaft bearing is at a sufficiently large distance from the cover component 1, so that the air drawn in by the fan enters through the notch as evenly as possible around the periphery, and thus also leaves as evenly as possible around the periphery of the fan cover, thereby uniformly cooling the housing 5.

[0090] An anti-interference part 31 is mounted on the cover 30. Alternatively, the anti-interference part 31 can be fixed on the inner side of the second cover member 2, through which the airflow delivered by the fan exits and is directed by the second cover member 2 such that the airflow flows along the outer side of the reducer.

[0091] As shown in the figure, the second cover component 2 also has a semi-circular notch, such that the bearing cover section extending axially toward the notch, which covers the bearing cover of the input shaft bearing, is at a sufficiently large distance from the second cover component 2, so that the air drawn in by the fan enters through the notch as evenly as possible around the periphery, and thus also leaves as evenly as possible around the periphery of the fan cover, thereby uniformly cooling the housing 5.

[0092] However, the fan cover can also be installed in other reducers where the circular bearing cover section is absent or located further away. In this case, the opening on the first cover component 1 is closed by installing the cover 30, thus guiding the airflow along the housing 5 better and more evenly. Similarly, in this case, the opening on the second cover component 1 is closed by installing another cover 30, thus guiding the airflow along the housing 5 better and more evenly.

[0093] If the connecting device or motor is connected to the input shaft and arranged axially close to the fan shroud so that air cannot flow axially, i.e. cannot flow through the grille parts 3 and 4, then it is possible for air to flow radially through the shroud parts 1 and 2 toward the fan.

[0094] Therefore, the airflow drawn in by the fan impeller is made to flow in radially and axially through the recesses of the corresponding air-permeable areas of the cover components (1, 2) and through the grille components (3, 4).

[0095] By shaping the fan shroud into an irregular polygonal end face, not only is a uniform circumferential distribution of airflow achieved, but the two-piece fan shroud can also be easily manufactured into a bent component. The bottom side of the reducer serves as a base or mounting surface and is not penetrated by the airflow.

[0096] However, the polygonal shape of the fan cover also forms a flat connecting plate area that is curved and arranged at the corresponding cover components, which enables the simple fixing of the same polygonal grille pieces (3, 4).

[0097] The air-permeable areas on grille members 3 and 4 have hexagonal notches that are evenly spaced apart. Therefore, the air-permeable areas have flat, regular grilles composed of hexagonal notches that axially penetrate the respective grille members (3, 4). This achieves optimal utilization of the grille area, particularly by maintaining high stability while maximizing air permeability.

[0098] Conversely, the cover components 1 and 2 have multiple radially penetrating notches shaped as slots, elongated holes, or ovals, the longest extension of which is oriented axially. Because these notches are arranged in the edge regions of the cover components (1, 2) adjacent to or facing the grilles (3, 4), this elongated shape provides the lowest possible flow resistance to radially flowing air, and sufficient stability for accommodating and supporting the grilles (3, 4) by means of the cover components (1, 2).

[0099] To improve stability, cover components 1 and 2 are extended as short as possible. However, to allow the airflow to flow as efficiently as possible along the reducer housing in the axial direction, cover 7 is adjacent to cover component 1 to guide the airflow. Cover 7 extends along the housing and is also fixed to the housing by means of connecting plate 9.

[0100] The cover 7, like the cover component 1, is made as a bent part, especially a sheet metal. Similarly, a bent connecting plate 9 is used to secure the cover 7 to the housing. Importantly, the connecting area of ​​the cover 7, i.e., the area of ​​the cover 7 that connects to and / or contacts the connecting plate 9, is constructed to be flat. That is, this connecting area of ​​the cover 7 is arranged in a plane that is not parallel to the flat surface area of ​​the reducer housing, i.e., has a non-zero angle. Therefore, the connecting area does not rest planarly against the surface area of ​​the reducer housing, but rather only makes linear contact when the two components come into contact. Thus, the connecting plate 9 bridges the non-zero angle existing between the surface area and the connecting area.

[0101] The retaining frame 32 is implemented as two segments, each of which is implemented as a bent piece. The retaining frame 32 is fixed to the housing 5, particularly by means of a threaded member screwed into a threaded hole, the threaded head of which presses the corresponding segment against the housing 5. On the other hand, two cover members (1, 2) are connected to each of these segments. Therefore, the cover members (1, 2) are supported, and particularly held, by the retaining frame 32 fixed to the housing 5.

[0102] Each segment of the retaining frame 32 also has an air guiding region that protrudes axially and thus guides at least partially the airflow supplied by the fan between the segment and the housing 5. Therefore, a portion of the airflow flows between the air guiding region of the segment and the housing 5. The retaining frame 32 is fixed to the housing 5, thus the air guiding region is cantilevered and retained.

[0103] The cover 7 is fixed to the housing 5 by means of the connecting plate 9.

[0104] Plates 50 are fixed on the cover components (1, 2) so that the conveyed airflow can be purposefully guided along the housing 5.

[0105] In other embodiments, the connecting plate 9 is constructed on the cover 7 itself by implementing the connecting plate as the curved region of the cover 7. Therefore, it is unnecessary to connect the connecting plate 9 to the cover 7, because the connecting plate is integrally formed, i.e., one-piece, on the cover 7 and bent so that the connecting plate surface rests against the surface area of ​​the reducer housing. The corresponding connecting plate 9 is pressed against the reducer housing by means of the threaded head of the threaded part screwed into the threaded hole of the housing. Therefore, although the area of ​​the cover 7 adjacent to the connecting plate 9 is not parallel to the surface area of ​​the housing receiving the threaded hole, a simple and cost-effective connection is still achieved.

[0106] This surface area is shown as flat surface segment 10 in the figure.

[0107] In the elliptical implementation, the main axis of the corresponding ellipse is oriented along the axial direction.

[0108] In other embodiments of the invention, a multi-piece design is used instead of a two-piece design for the fan cover.

[0109] In other embodiments of the invention, instead of a connecting plate area on the inner side of the cover members (1, 2), a frame member shaped as a polygon is welded onto each of the cover members (1, 2). The vertical projection of this frame member in the axial direction is the same as a portion of the polygon. The frame member, initially flat, is bent at each corner of the polygonal portion, so that the corresponding sides of the frame member, arranged between every two adjacent corners of the polygon, are flat and perpendicular to the orientation of the cover member. The normal direction of the plane accommodating the polygon is oriented in the axial direction. This makes the respective cover members (1, 2) more stable. To provide threaded holes for the threaded members connecting the grid members (3, 4) to the cover members (1, 2), nuts are welded to the frame members. Thus, the grid members (3, 4) can be tightened by means of the threaded members that axially penetrate the notches of the respective frame members and are screwed into the nuts, the threaded head of the threaded members pressing the respective grid members against the respective frame members.

[0110] List of reference numerals in the attached diagram:

[0111] 1. First Cover Component

[0112] 2 Second Cover Component

[0113] 3 First grille component

[0114] 4 Second grille component

[0115] 5. Shell

[0116] 6 input axes

[0117] 7 cover pieces

[0118] 8 bearing caps

[0119] 9 connecting plates

[0120] 10-square-meter section

[0121] 20 fan impeller

[0122] 30 cover pieces

[0123] 31 Anti-interference Department

[0124] 32. Maintain the frame

[0125] 50 pieces

[0126] 60 maintains the air-guiding area of ​​a segment of frame 32.

Claims

1. A speed reducer with a fan assembly, The fan unit has a fan impeller (20), a cover, and a grille, the cover being a fan cover. The fan impeller (20) is connected to the input shaft (6) of the reducer in a manner that prevents relative rotation. The cover is fixed to the retaining frame (32), which is fixed to the housing (5) of the reducer. The cover is formed by two cover components (1, 2). Its features are, The first cover component of the cover components (1, 2) is adjacent to the cover component (7, 30), which is supported and / or held by at least one connecting plate (9), which is connected to and / or fixed to the housing (5) of the reducer. The area covered by the cover (7, 30) in the axial direction is spaced apart from or adjacent to the area covered by the first cover member (1) in the axial direction. The axial direction is the direction of the rotation axis of the input shaft (6). The cover and cover (7, 30) are arranged and shaped such that a portion of the airflow delivered by the fan impeller (20) is guided by the cover and cover (7, 30) between the reducer housing (5) and the cover (7, 30). The circumferential corner area covered by the first grid member (3) in the circumferential direction is adjacent to the circumferential corner area covered by the second grid member in the circumferential direction without overlapping. The circumferential corner area covered by the first cover member (1) in the circumferential direction is adjacent to the circumferential corner area covered by the second cover member (2) in the circumferential direction without overlapping. The circumferential corner area covered by the first grid member (3) in the circumferential direction overlaps with the circumferential corner area covered by the first cover member (1). The grille is formed by two grille members (3, 4), each grille member (3, 4) being connected to each of the two cover members (1, 2), the first grille member (3) being connected to the first cover member and the second cover member (2) and the second grille member being connected to the first cover member and the second cover member (2).

2. The reducer according to claim 1, characterized in that, The surface area of ​​the reducer housing (5) that connects to the connecting plate (9) is constructed to be flat and is therefore included in the first plane. The connection area of ​​the cover (7, 30) that contacts or is adjacent to the connecting plate (9) is constructed to be flat and thus included in the second plane. The normal direction of the first plane has a non-zero angle relative to the normal direction of the second plane.

3. The reducer according to claim 1 or 2, characterized in that, The connecting plate (9) is manufactured as a bent part. The connecting plate (9) is connected to the cover (7, 30) by means of a threaded member, the threaded head of which presses the cover (7, 30) and the connecting plate (9) against the nut, and the threaded member is screwed into the nut. or The connecting plate (9) is formed as a one-piece curved area on the cover (7, 30).

4. The reducer according to claim 1 or 2, characterized in that, The threaded head of the threaded part, which is screwed into the threaded hole of the housing (5), presses the connecting plate (9) against the housing (5).

5. The reducer according to claim 1 or 2, characterized in that, The cover (7, 30) is connected to the first of the two cover components (1, 2). and / or The area covered by the cover (7, 30) in the axial direction is adjacent to and / or spaced apart from the area covered by the first cover (1) in the axial direction.

6. The reducer according to claim 1 or 2, characterized in that, The grid members (3, 4) are respectively constructed as polygons, such that the contact surfaces between the corresponding grid members (3, 4) and the corresponding cover members (1, 2) are respectively composed of flat surface segments (10).

7. The reducer according to claim 1 or 2, characterized in that, Between the two grid members (3, 4), the first separation line is constructed as a straight line, or as two straight lines aligned with each other. Between the two cover components (1, 2), the second separation line is constructed as a planar curve composed of straight line segments. The first separation line and the rotation axis of the input shaft (6) define a first plane. The second separation line and the rotation axis of the input shaft (6) define a second plane. The second plane is perpendicular to the first plane or has an angle between 30° and 90°.

8. The reducer according to claim 1 or 2, characterized in that, The cover, formed by two cover components (1, 2), is shaped such that the cover has an axially through opening, which is centrally arranged with respect to the input shaft (6).

9. The reducer according to claim 8, characterized in that, The cover components (1, 2) made of sheet metal into a bent part have corresponding connecting plate areas that extend into the opening, and the first grille (3) or the second grille (4) is fixed to the connecting plate areas. Nuts are welded onto the corresponding connecting plate area to provide threaded holes for threaded parts.

10. The reducer according to claim 8, characterized in that, On the cover components (1, 2) made of sheet metal and bent into shape, corresponding frame members welded to the inner side of the respective cover components (1, 2) extend into the opening, and the first grille member (3) or the second grille member (4) is fixed to the frame member. Nuts are welded onto the frame members to provide threaded holes for the threaded parts.

11. The reducer according to claim 8, characterized in that, The opening is covered by the two grille members (3, 4) in such a way that the axially entering airflow passes through the grille.

12. The reducer according to claim 7, characterized in that, The two grid members (3, 4) are in contact with each other along the first separation line or have a distance of less than 5 mm between them.

13. The reducer according to claim 7, characterized in that, The two cover components (1, 2) are in contact with each other along the second separation line or have a distance of less than 5 mm between them. and / or The airflow delivered by the fan impeller (20) flows out between the reducer housing (5) and the shroud. and / or The cover has end sides that are irregularly polygonal in shape in the circumferential direction. The radial outer periphery of this end side of the cover is shaped into an irregular polygon. and / or The cover components (1, 2) and / or the grille components (3, 4) are respectively manufactured as bent parts. and / or An anti-interference part (31) is fixed on the inner wall of each cover component. The anti-interference part is arranged between the corresponding cover component (1, 2) and the housing (5) of the reducer. The anti-interference part (31) has a through-hole grille. The anti-interference section is traversed by the airflow delivered by the fan impeller (20).

14. The reducer according to claim 1 or 2, characterized in that, Each cover component (1, 2) has a radially through notch, which is shaped as a slot, elongated hole, or ellipse, with the longest extension dimension of the corresponding notch oriented along the axial direction. and / or Each grid element (3, 4) has a uniform and / or regular flat grid consisting of multiple notches axially penetrating the respective grid element (3, 4).

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