A reduction gear having a housing comprising a lower part and a cover part

Abstract

The application relates to a speed reducer having a housing, the housing comprising a lower part and a cover part, an output shaft and an input shaft, wherein the lower part comprises a first support, a second support, a base plate and side walls, each of the side walls is connected with the first support on one side and connected with the second support on the other side, the first support is a closed ring structure, and the second support is an open ring structure, wherein a first bearing for rotatably supporting the output shaft is received in the base plate, a second bearing for rotatably supporting the output shaft is received in the second support, and the base plate is connected with the second support.

Description

TECHNICAL FIELD

[0001] The invention relates to a reduction gear having a housing with a lower part and a cover part. BACKGROUND

[0002] It is generally known that reduction gears can be embodied with a split housing, i.e. with a housing which can be produced by placing a cover part onto a lower part. SUMMARY

[0003] It is therefore an object of the invention to improve a reduction gear which is as small as possible at a predefined power and / or with a constant power.

[0004] According to the invention, this object is achieved by a reduction gear according to the features of claim 1.

[0005] An important feature of the invention in the context of a reduction gear is that the reduction gear has a housing with a lower part and a cover part, in particular a cover part which is placed onto the lower part, and has an output shaft and an input shaft, wherein the lower part has a first support, a second support, a base plate and side walls, wherein each side wall is connected, in particular welded, to the first support on the one hand and to the second support on the other hand, wherein the first support is a closed ring structure, in particular a closed ring, wherein the second support is an open ring structure, in particular an open ring, wherein a first bearing for rotatably supporting the output shaft is received in the base plate, wherein a second bearing, in particular a double bearing, for rotatably supporting the output shaft is received in the second support, wherein the base plate is connected, in particular welded, to the second support.

[0006] An advantage here is that a reduction gear which is as small as possible at a predefined power can be formed. Because despite the compact housing structure, a high torque can be conducted by means of the stiffening by means of the first support and the second support.

[0007] The output shaft is not only supported in the cover part but also in the lower part. A second bearing is additionally provided here, which can be designed as an axial bearing. An axial force introduced on the load side can thus be conducted out of the second bearing onto the second support and from there via the base onto the bottom of the device in which the reduction gear is arranged. In this way, a radial support can be achieved by means of the first bearing and a further bearing received in the cover part.

[0008] In an advantageous design variant, the first support is spaced apart from the second support. An advantage here is that the side walls arranged in between can be stiffened by means of ribs, so that the first support is rigidly connected to the second support and thus a stable housing can be provided. Furthermore, an introduced axial force can be conducted out of the second bearing onto the second support. The first support is thus not loaded by the axial force.

[0009] In an advantageous design variant, a base is connected, in particular welded, on the side of the second support facing away from the first support. The advantage here is that axial forces can be conducted further by means of the base to the bottom of the device.

[0010] In an advantageous design variant, the spacing between the opening of the open ring structure and the input shaft is smaller than the spacing between the opening and the output shaft. The advantage here is that there is a reduced stiffness in the region of the input shaft, in particular in the region of the bearing of the input shaft which is received in the lower part, so that this region of the reduction gear can only load the lateral forces of the input shaft to a small extent. But because a centring flange for connecting the reduction gear to the electric machine is provided on the reduction gear, the electric machine can be connected precisely to the reduction gear and thus the introduction of lateral forces can be prevented.

[0011] In an advantageous design variant, the first support is shaped like an O and the second support is shaped like a U. The advantage here is that the cover part can be placed on the first support and can be connected sealingly to the first support, in particular by means of a flat seal placed on the first support.

[0012] In an advantageous design variant, the first support and the second support are each designed to be flat, in particular wherein a plane containing the first support is oriented parallel to a plane containing the second support. The advantage here is that the side walls extend substantially perpendicular to these two planes.

[0013] In an advantageous design variant, one or more ribs are connected, in particular welded, to the respective side wall, in particular on the outside of the respective side wall, wherein each of the ribs is connected, in particular welded, not only to the first support but also to the second support. The advantage here is that an increased stiffness can be achieved.

[0014] In an advantageous design variant, the maximum distance of the ribs to the respective side wall increases monotonically, in particular strictly monotonically, with increasing distance from the first support and decreasing distance from the second support. The advantage here is that forces conducted by the ribs can be spread towards the second support, so that only a small pressure is exerted on the second support.

[0015] In an advantageous design variant, a viewing window is arranged in the recess of at least one of the side walls. The advantage here is that the oil level can be observed, and in addition the force density is small through the side wall, so that a recess for the viewing window can be provided in the side wall.

[0016] In an advantageous design, the cover part is connected with the first support, in particular wherein the first support is formed annularly, i.e. without an opening, and the cover part is placed on the connection plane provided by the first support by means of an edge region of the cover part which protrudes in radial direction with reference to the rotational axis of the output shaft. An advantage here is that the first support can be configured widened and thus can constitute a bearing surface for the cover part.

[0017] In an advantageous design, a further bearing for rotatably supporting the output shaft is received in the cover part. An advantage here is that simple manufacture can be achieved. Since, when manufacturing, the cover part is not yet placed onto the lower part, the shaft together with the first bearing and the second bearing can be inserted through the large opening present. Only then is the cover part placed and at this point the further bearing for rotatably supporting the shaft is received in the cover part.

[0018] In an advantageous design, the second bearing is an axial bearing, in particular a roller bearing, in particular a self-aligning roller bearing or a barrel roller bearing / spherical bearing. An advantage here is that high axial forces can be introduced into the second support. The second support has a greater wall thickness than the base plate and any side wall.

[0019] In an advantageous design, an oil sump / oil pan is fixed on the side of the base plate facing away from the first support. An advantage here is that oil which flows out of the second bearing can be collected. Furthermore, the oil in the oil sump can be cooled, since the oil sump has a small wall thickness and the oil is calmed down there by means of fins welded in the oil sump and heat flows through the oil sump to the surroundings during the higher residence time resulting therefrom.

[0020] In an advantageous design, the oil sump and the base plate are arranged inside the second support, in particular inside the U, in particular between the legs of the U. An advantage here is that the oil sump is arranged protected.

[0021] In an advantageous design, second fins are connected on the side of the base plate facing away from the cover part, which second fins are in welded connection with the base plate and also in welded connection with the second support. An advantage here is that a rigid connection can be achieved. Thus, even under high loads, the first bearing is precisely oriented with respect to the second bearing.

[0022] In an advantageous design, the oil sump has a third rib welded on in its bottom region facing the cover part, which is fixed on the circumferential edge region of the oil sump, in particular welded thereon, wherein the direction of extension of the third rib, in particular the direction of the longest extent of the third rib, is arranged in a plane whose normal direction is oriented parallel to the rotational axis of the output shaft and is oriented at an angle to the plane containing the rotational axes of at least two shafts of the reduction gear, wherein the angle has a value of between 10° and 80°. Here, the advantage is that the oil sump is reinforced on the one hand and, on the other hand, the oil is used to stabilize and reduce oil foam.

[0023] Further advantages emerge from the dependent claims. The application is not restricted to the feature combinations of the claims. Further meaningful combination possibilities of the claims and / or individual claim features and / or specification features and / or drawing features are available to the person skilled in the art, in particular from the tasks set and / or by comparison with the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0024] The application is now explained in detail by means of schematic drawings:

[0025] In Figure 1 a perspective view, a housing of a reduction gear according to the application with split housing is shown, wherein the cover part 1 is raised.

[0026] In Figure 2 a perspective view, the reduction gear is shown from another viewing angle, so that the oil sump 20 arranged on the underside of the lower part can be seen.

[0027] In Figure 3 a perspective view, the reduction gear is shown from a third viewing angle.

[0028] In Figure 4 a perspective view, the oil sump 20 is shown.

[0029] In Figure 5 a cross section of a region of the reduction gear is shown.

[0030] LIST OF REFERENCE SIGNS

[0031] 1 cover part

[0032] 2 first bearing, in particular circumferential ring bearing

[0033] 3 side wall

[0034] 4 rib

[0035] 5 second bearing

[0036] 6 base

[0037] 7 base plate

[0038] 20 oil sump

[0039] 21 output shaft

[0040] 22 input shaft

[0041] 23 second rib

[0042] 50 first bearing

[0043] 51 second bearing

[0044] 52 spatial region of the oil sump

[0045] 53 axial bore

[0046] 54 radial bore DETAILED DESCRIPTION

[0047] As shown, the housing of the reduction gear has a cover part 1 which is seated on a lower part of the housing in the axial direction, i.e. parallel to the direction of the rotational axis of the output shaft 21 of the reduction gear.

[0048] The lower part has a bearing seat for a first bearing 50 of the output shaft 21 and another bearing seat for a second bearing 51 of the output shaft 21. The cover part 1 likewise has a bearing seat for a bearing of the output shaft 21.

[0049] Further bearing seats for bearings of the input shaft 22 and at least one further shaft, in particular an intermediate shaft, are also provided in the lower part.

[0050] The output shaft 21 is subjected to axial forces when the reduction gear is in operation.

[0051] The second bearing 51 is therefore designed as a radial thrust bearing, in particular a barrel roller bearing. The axial forces on the output shaft 21, in particular introduced by the driving load, are therefore introduced onto the bearing seat.

[0052] The bearing seat is implemented by means of a shaped and finished bearing seat on the second carrier 5. The second bearing 51 is therefore received in the second carrier 5.

[0053] The first bearing 50, on the other hand, is received in the base plate 7. To this end, a bearing seat is configured, in particular finished, on the base plate 7.

[0054] The second carrier 5 is welded on the base plate 7 of the lower part. The reduction gear is preferably oriented such that the rotational axis of the output shaft 21 is oriented vertically.

[0055] The second bearing 5 is configured in the shape of a U. Thus, the second bearing does not completely encircle the edge of the base plate 7. The opening of the U is oriented towards the input shaft. The opening of the U has a smaller spacing from the input shaft 22 than from the output shaft 21.

[0056] The U is designed to be flat. The normal of the plane containing the U is oriented parallel to the rotational axis of the output shaft 21.

[0057] The second bearing 5 is welded to the base plate 7 and thus imparts a high stiffness and / or stability to the base plate.

[0058] The first bearing 2 is configured in the shape of an O, in particular a ring. The normal of the plane containing the O is oriented parallel to the rotational axis of the output shaft 21.

[0059] The first bearing 2 and the second bearing 5 are thus oriented parallel to one another.

[0060] The side walls 3 of the lower part are connected both to the base plate 7 and to the first bearing 2. Here, the base plate 7 is spaced apart from the first bearing 2.

[0061] The first bearing 2 is welded to the side walls 3, the side walls 3 are welded to the second bearing 5, and the second bearing 5 is welded to the base plate 7. In this way, the lower part of the speed reducer is configured.

[0062] The four side walls 3 each have a thinner wall thickness than the base plate 7 and the first bearing 2 and the second bearing 5.

[0063] Furthermore, in order to increase the stiffness and stability, ribs 4 are provided on the lower part. Preferably, the first kind of ribs 4 are embodied such that each of the ribs 4 is connected, in particular welded, not only to the first bearing 2 but also to the second bearing 5 and to one of the side walls 3.

[0064] Hereby an increased stiffness is achieved and for this purpose the first bearing 2 and the second bearing 5 protrude on the respective side wall 3 towards the surroundings, so that each rib 4 can be placed on the outside of the side wall 3. The ribs 4 are spaced apart from one another. Thus, notches are formed between the ribs 4, which notches are defined by the first bearing 2, the second bearing 5, the respective side wall 3 and each two ribs 4.

[0065] The base 6 is connected, in particular welded, on the side of the second bearing 5 facing away from the side walls 3, in particular the underside.

[0066] The second bearing 51 received in the second bearing 5 thus directly transfers the axial forces input from the output shaft 21 onto the second bearing 5 and from there onto the base 6, which is arranged on the bottom of the device or on the fixed surface of the machine. The base plate 7 is thus not subjected to the axial forces.

[0067] In contrast, a portion of the transverse force input on the output shaft 21 is conducted via the first bearing 50 onto the base plate 7.

[0068] The opening of the U of the second support 5 is further away from the crosspiece connecting the two legs of the U of the U than the crosspiece. In this way, the input of the axial force takes place at the most rigid point of the U.

[0069] On the side of the base plate 7 facing away from the cover part 1, an oil sump 20 is attached, in which an oil reservoir of the reduction gear can be received. The oil sump 20 is pressed against the base plate 7 by means of screws, in particular by means of the screw heads of the screws.

[0070] The oil sump 20 and / or the base plate 7 are arranged within the U, in particular between the legs of the U.

[0071] The respective fin 4 has a maximum distance to the side wall 3, to which the respective fin is connected, in particular welded, which monotonically increases with increasing distance from the first support 2. In this way, the second support 5 is connected to the side wall 3 with improved stiffness.

[0072] The first support 2 is formed circumferentially, i.e. without openings. Thus, the cover part 1, in particular by means of an edge region of the cover part 1 projecting in a radial direction on the cover part 1 with reference to the rotational axis of the output shaft, rests on the connection plane provided by the first support 2 and is sealed in connection by means of a planar seal arranged therebetween in such a way that the cover part 1 is pressed against the first support 2 by means of screws, in particular the screw heads thereof, which pass through the cover part 1 and are screwed into threaded holes in the first support 2.

[0073] By means of an axial hole 53 through the base plate 7, i.e. an axial hole 53 through the base plate 7 oriented in the direction of the rotational axis of the output shaft 21, oil can be fed from the interior space region comprising the toothed element to an oil reservoir arranged in the oil sump 20. Here, a radial hole 54 machined in the base plate 7 opens into the axial hole 53 and thus also enables the discharge of oil, wherein the axial hole 53 is closed during operation, in particular with a closure plug.

[0074] In this way, the oil of the interior space region can also be easily discharged at the time of maintenance, etc.

[0075] On the side of the base plate 7 facing away from the cover part 1, second fins 23 are attached, which are welded to the base plate 7 and also to the second support 5. Thus, the stiffness of the lower part is further improved.

[0076] The second carrier 5 is thus reinforced on its side facing the cover part 1 and on its side facing the oil sump 20 by means of ribs (4, 23). The weight of the oil sump 20, which is filled with oil, can thus together with the weight of the base plate 7 also be delivered to the second carrier 5 together with the forces which are introduced into the base plate 7 and the force flow which is conducted via the side wall 3, without significant deformation of the lower part occurring.

[0077] The oil sump 20 itself has on its bottom region 42 facing the cover part 1 third ribs 41 which are welded on at the oil sump's circumferential edge region 40. These third ribs 41 serve to calm the oil which is collected in the oil sump 20. To this end, the direction of extension of the third ribs 41, in particular the direction of the longest extent of the third ribs 41, is arranged in a plane whose normal direction is oriented parallel to the rotational axis of the output shaft and is oriented at an angle to the plane which contains at least the rotational axes of the at least two shafts of the reduction gear, wherein the value of the angle is between 10° and 80°. The ribs 41 thus do not extend perpendicularly to, but rather obliquely to, the plane which contains the rotational axes of the at least two shafts.

[0078] In other embodiments according to the application, an observation window is arranged in the recess of the side wall 3 of the lower part.

Claims

1. A speed reducer having a housing, the housing including a lower part and a cover part disposed on the lower part, the speed reducer further including an output shaft and an input shaft. Its features are, The lower component includes a first support, a second support, a base plate, and a sidewall. Each sidewall is connected to the first support on one side and to the second support on the other. The first support is a closed ring structure. The second support is an open ring structure. The substrate contains a first bearing for rotatably supporting the output shaft. The second support houses a second bearing for rotatably supporting the output shaft; this second bearing is a double bearing. The substrate is connected to the second support. Multiple bases spaced apart from each other are connected to the side of the second support opposite to the first support. The second bearing is configured as an axial bearing, so that the axial force introduced on the load side can be discharged through the second bearing to the second support, and from there through the base to the bottom of the equipment in which the reducer is arranged. The distance between the opening of the open annular structure and the input shaft is smaller than the distance between the opening and the output shaft.

2. The reducer according to claim 1, characterized in that, Its features are, The first support is spaced apart from the second support.

3. The reducer according to claim 1 or 2, Its features are, The first support is shaped like an O, and the second support is shaped like a U. The first and second supports are designed to be flat. The plane containing the first support is parallel to the plane containing the second support.

4. The reducer according to claim 1 or 2, Its features are, One or more first ribs are connected to the corresponding sidewalls. The corresponding first rib is connected to both the first support and the second support.

5. The reducer according to claim 1 or 2, Its features are, As the distance from the first support increases and the distance from the second support decreases, the maximum distance at the first rib relative to the corresponding sidewall increases monotonically.

6. The reducer according to claim 1 or 2, Its features are, The observation window is arranged in a recess in at least one of the side walls.

7. The reducer according to claim 1 or 2, Its features are, The cover component is connected to the first support. The first support is formed around the ground, i.e. without openings, and the cover component is placed on the connecting plane provided by the first support by means of the edge area of ​​the cover component protruding in the radial direction along the rotation axis of the output shaft.

8. The reducer according to claim 1 or 2, Its features are, The cover assembly houses an additional bearing for rotatably supporting the output shaft.

9. The reducer according to claim 1 or 2, Its features are, The second bearing is a self-aligning roller bearing or a barrel roller bearing.

10. The reducer according to claim 1 or 2, Its features are, An oil pan is fixed on the side of the substrate away from the first support.

11. The reducer according to claim 10, Its features are, The oil pan and the base plate are arranged inside the second support.

12. The reducer according to claim 1 or 2, Its features are, A second rib is connected to the side of the substrate away from the cover component. The second rib is welded to the substrate and also welded to the second support.

13. The reducer according to claim 10, Its features are, The oil pan has a third rib welded to its bottom region facing the cover component, the third rib being fixed to the surrounding edge region of the oil pan. The direction of the longest extension dimension of the third rib is arranged in a plane whose normal direction is parallel to the rotation axis of the output shaft and is oriented at an angle to the plane containing the rotation axes of at least two shafts including the reducer, wherein the value of the angle is between 10° and 80°.

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