Reducer with housing component and method for producing reducer

Abstract

The present invention relates to a reducer having a housing component and a method for producing a reducer, wherein the housing component is a casting, in particular a die casting, in particular an aluminum die casting, wherein the housing component is produced by two forming dies, which move apart relative to each other in a first pulling direction during demolding, wherein the housing component has an intermediate wall, in particular due to a minimum distance between the two forming dies, and the intermediate wall serves in particular as a spacer between the two forming dies.

Description

Technical Field

[0001] The invention relates to a reduction gear having a housing component and a method for producing the reduction gear. Background Art

[0002] A spur gear reducer is known from EP 17 33 153 B1.

[0003] When producing die-cast parts, it is known to carry out the forming with the aid of two casting dies, i.e. forming dies, which move apart relative to one another during demolding in a first pulling direction. During demolding, the other forming die is pulled out in a pulling direction different from the first pulling direction, and for the sake of simplicity, the other forming die is referred to below as a sliding core.

[0004] The casting mold preferably produces the outer contour of the die-cast part. Summary of the invention

[0005] The object of the present invention is therefore to improve a reduction gear which is simple to produce and economical.

[0006] According to the invention, this object is achieved by a reduction gear according to the features specified in claim 1 and by a method according to the features specified in claim 10 .

[0007] An important feature of the reducer with a housing component according to the invention is that the housing component is a casting, in particular a die casting, in particular an aluminum die casting.

[0008] The housing part is produced by two forming dies, which move apart relative to each other in a first pulling-out direction during demoulding.

[0009] In this case, the housing part has an intermediate wall which in particular acts as a spacer due to the minimum distance between the two forming tools.

[0010] The advantage here is that in this way a very small amount of oil can be achieved in the reducer. This is because the two forming dies can be used to produce a groove or a pot that is as large as possible in the housing part, which follows the contour of the toothed part, in particular the output gear, as closely as possible. In this way, a small amount of oil can be achieved. However, contact between the two forming dies is still avoided, and the intermediate wall is used in a material-saving manner. The intermediate wall can be designed to be very thin, because it does not have to be designed to have a load-bearing function, but only needs to separate the two forming dies.

[0011] The rectangular or square outer frame can be stabilized by the intersection in the frame, and a bearing receptacle for the output shaft bearing can be arranged in the center of the outer frame. Preferably, the bearing receptacle is also spaced apart from the bottom side, that is, spaced apart from the footing surface and connected to the bottom side only by ribs.

[0012] In the intermediate wall, in particular, a spatially limited thinning of the wall can be provided, which serves as a casting plate and is referred to here as a knockout. The knockout makes it possible to simply provide a flow-out possibility for liquids that may collect in the recess, such as water or oil. In this case, only a percussion tool is required to remove the knockout, i.e. no drilling tool is required.

[0013] In an advantageous embodiment, the intermediate wall is formed in a planar manner and the pull-out direction is oriented parallel to the plane of the intermediate wall, in particular the normal direction of the center plane. This has the advantage that the intermediate wall is arranged corresponding to the casting plate. As a result, only a small amount of material has to be used for the intermediate wall and the wear of the two forming dies can still be reduced. This is because there is a high wear of the two forming dies when they come into contact.

[0014] In an advantageous embodiment, the intermediate wall has a wall thickness of between 1 mm and 10 mm. This has the advantage that only a small amount of material is required, but the wear and tear of the two forming tools is still reduced. Due to the small wall thickness, the knockout can be removed with less force.

[0015] In an advantageous embodiment, the housing part has a rib extending in the pull-out direction, which connects the bearing receptacle of the bearing of the output shaft of the reducer to the underside of the outer frame of the housing part.

[0016] In particular, the vertical projection of the frame in the extension direction is essentially rectangular. This has the advantage that the lower side, that is, the side of the outer frame having the footing surface, is spaced apart from the bearing receptacle. Thus, a point-like introduction of torque into the footing surface in the circumferential direction around the output shaft can be achieved via the ribs.

[0017] In an advantageous embodiment, the bearing receptacle is connected to the upper side of the outer frame by means of a further bearing receptacle, which receives the bearing of the intermediate shaft of the reducer. This has the advantage that the bearing receptacle of the output shaft is again spaced apart from the upper side. Furthermore, it is possible to introduce torque into the upper side in a punctiform manner in the circumferential direction around the output shaft via the further bearing receptacle.

[0018] In an advantageous design, the bearing receptacle is connected to the side surface of the outer frame by means of a thickened region. The advantage here is that a torque can be introduced into the side surface having the footing surface in a point-like manner around the output shaft via the thickened region.

[0019] In an advantageous embodiment, the bearing receptacle is connected to the side of the outer frame by means of a flange region. This has the advantage that a rigid connection on the input side is achieved.

[0020] In an advantageous embodiment, the reducer is a reversing gear. This has the advantage that two forming tools and, in particular, two further forming tools, i.e., sliding cores, are required to demold the reducer housing. Thus, the input side and the housing interior can be demolded separately from the output side and its mirror image.

[0021] In an advantageous design, the flange area is arranged to be connected to an electric motor, in particular a housing of the electric motor, which drives an input shaft of the reduction gear. Advantageously, the input shaft is oriented perpendicularly to the output shaft.

[0022] In an advantageous embodiment, the housing part is provided with a further housing opening for assembling the gear and the shaft. The advantage here is that the housing opening can be designed in such a way that the corresponding side of the outer frame of the reducer can be designed to be very strong by arranging a forming die, in particular with a sliding core for the inner space.

[0023] An essential feature of the method for producing a reduction gear is that the reduction gear has a housing part which is produced from a casting material, in particular aluminum, as a die-cast part.

[0024] In this case, in particular during die casting, the casting material is arranged between the two forming dies as an intermediate wall, in particular as a spacer between the two forming dies, the intermediate wall in particular having a wall thickness of between 1 mm and 10 mm,

[0025] In this case, when the housing part produced as a die-cast part is demolded, the forming tools are moved away from each other, in particular in a first pulling direction.

[0026] In particular, the first pull-out direction runs parallel to the axis of rotation of the output shaft of the reducer.

[0027] The advantage here is that a very thin intermediate wall can be produced, which is produced between the two forming dies due to the spacing of the two forming dies, thereby reducing the wear of the forming dies.

[0028] In an advantageous design, after pulling out the two forming molds, the knockout is removed, especially knocked off. Advantageously, the knockout can be removed without much force, and the outflow of the liquid can therefore be achieved.

[0029] In an advantageous embodiment, when the housing part produced as a die-cast part is demolded, a further forming tool, in particular a third forming tool, is pulled out perpendicularly to the first pulling direction, in particular for producing a bearing receptacle for an input shaft bearing.

[0030] In particular, the third forming tool is spaced apart from the two forming tools. This has the advantage that the output side, the side opposite thereto and the input side can be formed with the aid of three forming tools. Thus, the input region can be formed as a hollow flange and the corresponding side of the outer frame of the reducer can thus be designed very sturdily.

[0031] In an advantageous embodiment, when the housing part produced as a die-cast part is demoulded, the fourth molding tool is pulled out perpendicularly to the first pulling direction, in particular to produce an inner housing space for accommodating the gear and the shaft.

[0032] In particular, the fourth shaping die is spaced apart from the two shaping dies. The advantage here is that the output side, the side opposite thereto and the housing interior can be shaped with the aid of these shaping dies. Thus, the corresponding side of the outer frame of the reducer can be implemented very firmly.

[0033] Further advantages are derived from the dependent claims. The invention is not limited to the combination of features of the claims. Other meaningful possible combinations of the claims and / or features of the individual claims and / or features of the description and / or features of the drawings are apparent to the person skilled in the art, in particular from the task proposed and / or the task proposed in comparison with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will now be further described with the aid of the accompanying schematic drawings.

[0035] exist Figure 1 1 shows a housing component 1 of a reduction gear according to the invention in an oblique view, wherein the knockout 4 can be seen.

[0036] exist Figure 2 The housing part 1 is shown in a sectional view.

[0037] exist Figure 3 2 shows a cross section through a region of the housing component 1 .

[0038] exist Figure 4 2 shows a side view of the housing part 1 . DETAILED DESCRIPTION

[0039] As shown in the figures, the housing part 1 has a flange area 7 to which the housing of the electric machine can be connected. The rotor shaft of the electric machine is connected to the input toothing part of the reduction gear in a rotationally fixed manner.

[0040] The housing part 1 is produced by die casting and serves as a housing part of a reversing gear. Preferably, the housing part 1 is produced as an aluminum die casting.

[0041] After the injection of molten casting material, in particular aluminum, the die-cast part is demolded by means of a sliding core which is correspondingly moved linearly, in particular pulled out.

[0042] The third molding die demolds the inner space enclosed by the flange area 7 in the direction of the rotor shaft axis, in particular in a direction perpendicular to the first pulling direction of the two molding dies. Therefore, the third molding die is pulled out in the direction of the rotor shaft axis.

[0043] The fourth molding tool demolds the interior space enclosed by the cover opening 11 , in particular perpendicularly to the output shaft axis and perpendicularly to the rotor shaft axis.

[0044] The first molding die and the second molding die are demoulded perpendicularly to the axial direction of the rotor shaft. Here, the first molding die is pulled out in the direction of the output shaft, while the second molding die is pulled out in the opposite direction.

[0045] As the intermediate space between the two forming dies which is filled before the two forming dies are pulled out, an intermediate wall 5 which serves as a spacer between the two forming dies is produced. The intermediate wall 5 is substantially planar in design. The normal direction of the plane is oriented parallel to the direction of the output shaft.

[0046] The corresponding knockouts 4, ie in particular the regions of the intermediate wall 5 with reduced wall thickness, are arranged in the intermediate wall 5. In this way, as in Figure 3 As shown in the figure, the knockout 4 can be opened by a tool 30, in particular by means of knocking or impact. In this way, when the reducer is in the assembled arrangement, water can flow out through the opened knockout 4, in which the intermediate wall 5 serves as the bottom of a pot-shaped recess, in particular a groove-shaped recess.

[0047] The corresponding knockout 4 is similar to a cast plate, since its wall thickness is less than the wall thickness of the intermediate wall 5. In particular, the wall thickness of the knockout 4 is less than 1 millimeter.

[0048] The normal direction of the planar intermediate wall is parallel to the direction of the output shaft, the bearing of which is accommodated in a bearing receptacle 6 formed in an annular manner on the housing part 1 .

[0049] The bearing receptacle has widenings directed radially with reference to the rotational axis of the output shaft, which are regularly spaced apart from one another in the circumferential direction and in which axially directed holes are introduced.

[0050] The rib 3 extends in the direction of the output shaft of the reducer, thereby achieving a rigid connection between the bearing receptacle 6 of the output shaft bearing and the outer frame of the housing part 1 .

[0051] The outer frame is formed by the lower side of the approximately cuboid housing part 1 , the upper side with the cover opening 11 , the first side surface and the flange region 7 as the second side surface.

[0052] The outer frame is designed to be thickened. However, the outer frame alone cannot withstand shear forces oriented parallel to the axis of the input shaft.

[0053] The intermediate wall 5 is only very thin and only slightly reinforces the outer frame.

[0054] For reinforcement, a cross-shaped structure is first provided, wherein the four end regions of the four limbs of the cross are each connected centrally to the outer frame on one of the sides of the cuboid housing part. This achieves a stabilization of the housing part 1 .

[0055] To form the intersection, the centrally arranged bearing receptacle 6 is connected to the upper side by means of a further bearing receptacle which accommodates the bearing of the intermediate shaft of the reduction gear.

[0056] The bearing receptacle 6 is connected to the underside via the rib 3 .

[0057] The bearing receptacle 6 is connected to the side surface by means of a first thickened region 8 , in particular a bridging region.

[0058] The bearing receptacle 6 is connected to the flange region 7 by means of a second thickened region 9 , in particular a bridging region.

[0059] The bottom and the side surfaces each have a footing region 2 which is processed flat on its outer side. The reducer can thus be fixed to a plate by means of its bottom side or can be placed on a plate. Alternatively, however, the side surfaces can also be fixed or placed on a plate, wherein another assembly orientation of the reducer can be achieved in this case.

[0060] Since the thickened regions 8 , 9 , the further bearing receptacle 10 and the rib 3 extend in the axial direction, a high rigidity can be achieved.

[0061] Thus, by pulling out the first forming tool, a cup-shaped recess is produced, the bottom of which forms the intermediate wall 5 and the walls of which are formed by the outer frame.

[0062] Likewise, by pulling out the second forming tool on the opposite side, a trough-shaped recess is also formed, the bottom of which forms the intermediate wall 5 and the walls of which are formed by the outer frame.

[0063] Therefore, during die casting, the two forming dies are spaced apart from each other and do not touch each other. Thus, on the one hand, the intermediate wall 5 is formed and filled with material. On the other hand, direct contact between the two forming dies is avoided, so that increased wear of the otherwise existing contact surfaces of the two forming dies can be avoided, because increased wear can be caused when the two forming dies are in contact. Therefore, the intermediate wall 5 prevents this increased wear.

[0064] The opening through the intermediate wall 5 can be produced in a simple manner by means of the knockout 4 .

[0065] The intermediate wall 5 , apart from the knockouts, has a wall thickness of greater than 1 mm, in particular less than 10 mm.

[0066] List of reference numerals:

[0067] 1 Housing parts

[0068] 2 Base region

[0069] 3 Ribs

[0070] 4 Knockout, in particular a region of the intermediate wall 5 with reduced wall thickness, in particular a casting plate

[0071] 5 Intermediate wall, especially for separating two forming molds

[0072] 6 Bearing receiving part

[0073] 7 Flange area

[0074] 8 Thickened area

[0075] 9 Thickened area

[0076] 10 Another bearing receptacle, in particular for an intermediate shaft of a reduction gear

[0077] 11 Cover opening

[0078] 30 Tools

Claims

1. A reducer having a housing component, wherein: The housing parts are die castings. It is characterized in that The housing part is produced by two forming dies which move apart relative to one another in a first pull-out direction during demoulding. The housing component is produced by a first forming die and a second forming die, and during demoulding, the first forming die and the second forming die move away from each other along a straight line, which is oriented parallel to the pulling direction. The housing part has an intermediate wall in order to maintain a minimum distance between the two forming dies, and the intermediate wall serves as a spacer between the two forming dies; The housing component has a rib extending in the pull-out direction, which connects the bearing receiving portion of the output shaft bearing of the reducer with the lower side of the outer frame of the housing component, and the vertical projection of the frame in the pull-out direction is substantially rectangular; The bearing receptacle is connected to the upper side of the outer frame by means of a further bearing receptacle which accommodates a bearing of an intermediate shaft of the reducer; Disposing knockouts spaced apart from one another on the intermediate wall, the knockouts having a wall thickness region that is smaller than the wall thickness of the intermediate wall outside the knockouts; A basin-shaped recess is produced by pulling out the first forming die, the bottom of which forms an intermediate wall, and the walls of which are formed by the outer frame. A basin-shaped recess is also formed by pulling out the second forming die on the opposite side, the bottom of which forms an intermediate wall, and the walls of which are formed by the outer frame.

2. The reducer according to claim 1, characterized in that: The intermediate wall is of planar design, and the pull-out direction is oriented parallel to the normal direction of the center plane of the intermediate wall.

3. The reducer according to claim 1, characterized in that: The intermediate wall has a wall thickness between 1 mm and 10 mm.

4. The reducer according to any one of claims 1 to 3, characterized in that: The bearing receptacle is connected to the side surface of the outer frame by means of a thickened region.

5. The reducer according to any one of claims 1 to 3, characterized in that: The bearing receptacle is connected to the side of the outer frame by means of a flange region.

6. The reducer according to any one of claims 1 to 3, characterized in that: The reducer is a reversing transmission device.

7. The reducer according to any one of claims 1 to 3, characterized in that: The flange area is provided for connection to a housing of an electric motor driving an input shaft of the reduction gear.

8. A method for manufacturing a reducer according to any one of the preceding claims, wherein: The reducer has a housing part which is produced from a casting material as a die-casting. It is characterized in that Between the two forming dies, during the die casting of the housing component, the casting material is arranged to form an intermediate wall for spacing the two forming dies apart, the intermediate wall having a wall thickness of between 1 mm and 10 mm, knockouts are arranged at the intermediate wall at intervals from one another, the knockouts having a wall thickness region that is smaller than the wall thickness of the intermediate wall outside the knockouts, During demoulding, the two forming molds are moved apart relative to each other in a first pulling direction. The first pull-out direction is oriented parallel to the rotation axis of the output shaft of the reducer.

9. The method according to claim 8, characterized in that After the forming die has been pulled out, the knockout arranged at the intermediate wall is removed.

10. The method according to claim 8, characterized in that When the housing part made into a die-cast part is demoulded, the third forming die is pulled out perpendicularly to the first pulling direction to form the bearing receiving portion of the input shaft bearing. The third molding die is spaced apart from the two molding dies.

11. The method according to claim 10, characterized in that When the housing component is demoulded, the fourth molding die is pulled out perpendicularly to the first pulling direction to produce an inner space of the housing, which is used to introduce the gears and the shaft when the gears and the shaft are installed in the housing component. The fourth molding die and / or the inner space of the housing are spaced apart from the two molding dies.

12. The method according to claim 11, characterized in that The fourth molding tool demolds the housing interior space accessible through a cover opening (11) of the housing component perpendicularly to the output shaft axis and perpendicularly to the rotor shaft axis.

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