Gearbox housing with perforated oil pan

Abstract

The present invention relates to a gearbox housing (10) with at least one side wall (12). At least one of the side walls (12) has one or more housing openings (14) for receiving bearings (16), and on the inside (18) of one of the side walls (12), a rib structure (20) is formed above the housing opening (14) and tapered in a funnel-like shape vertically toward the housing opening (14). A collecting pan (22) at the foot of the rib structure (20) collects sprayed oil or lubricating oil and supplies it to gear elements, such as bearings, housed in the gearbox housing (10). The funnel-shaped rib structure (20) collects the lubricating oil in a concentrated manner. The collecting pan (22) is drilled from the outside through the side wall (16) to the lower area of ​​the rib structure (20).

Description

Technical Field

[0001] The present invention relates to a gearbox housing having at least a plurality of side walls, at least one of these side walls having one or more housing openings for accommodating bearings, and in this case, on the inner side of one side wall, above one housing opening, there is formed a rib structure that tapers funnel - like vertically towards the housing opening. Through this rib structure, spray oil or lubricating oil is collected, and the oil is supplied to a plurality of gear components, such as bearings, accommodated in the gearbox housing.

[0002] The collection and fluid guiding of spray oil or lubricating oil in the gearbox housing are usually carried out through a plurality of oil guiding ribs and / or oil receiving pockets that are fairly complexly cast. These oil guiding ribs are primarily for the above - mentioned oil guiding, rather than for strengthening or reinforcing the rigidity of the housing structure itself. It is always necessary to improve the gearbox housing from the perspective of collecting and fluid guiding spray oil or lubricating oil, and incorporate the perspective of strengthening and reinforcing the rigidity of the housing structure in this process. Patent Document 1 shows a gearbox housing having a U - shaped rib structure on the lower flange, and an undercut is made on the lower flange using casting technology, thereby forming a collection pan. A drill hole is drilled vertically upward from the bearing seat so that the oil collected there can flow to the bearing, and this drill hole can communicate with the collection pan. Patent Document 2 discloses oil supply through a bearing cover and an oil drill hole.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

[0004] The object of the present invention is to provide a means that enables improved collection and guidance of spray oil or lubricating oil, with respect to strengthening and reinforcing the rigidity of the housing structure. [Means for solving the problem]

[0005] This problem is solved by a gearbox housing having the features of claim 1. Preferred embodiments are shown in several dependent claims and in the following description, each individually or in combination, illustrating aspects of the invention. Where one feature is shown in combination with other features, this is for the sole purpose of simplifying the presentation of the invention and does not mean that the feature cannot be an advanced form of the invention without the other features.

[0006] One embodiment relates to a gearbox housing having a plurality of side walls, at least one of which has one or more housing openings for housing bearings, in which case a funnel-shaped tapered rib structure is formed on the inside of one side wall above one housing opening and perpendicular to the housing opening, in which case a collection pan is provided, the funnel-shaped tapered rib structure joins this collection pan, and this collection pan is formed by a drilled hole penetrating the side wall.

[0007] In typical operating conditions, multiple side walls are oriented vertically. This means that the direction perpendicular to the housing opening surface of the side walls is horizontal. Two side walls positioned horizontally opposite each other can be provided with funnel-shaped tapered rib structures above each housing opening. These side walls can stand on a single housing base. Multiple housing legs can be provided, which are substantially formed by the housing base but can also be retracted into the side walls.

[0008] Spur gears and / or bevel gears can be housed within a gearbox housing via corresponding shafts. These shafts can be rotatably mounted via multiple bearings housed within multiple housing openings. These housing openings are preferably configured as round holes. Rolling bearings, for example, can be used as bearings.

[0009] This gearbox housing can be made partially or entirely thin-walled, and the resulting reduction in rigidity is at least offset by rib structures provided on the inside of the side walls. Further rib structures or ribs may also be provided to contribute to increasing the rigidity of the gearbox housing.

[0010] This rib structure is formed by projections rising from the main surface. In a simple embodiment, this rib structure can be formed by only two ribs that extend toward each other, tapering downward vertically. This funnel-shaped tapering rib structure is also, incidentally, called a V-shape. In this case, it is not necessarily required that the V-shape be pointed downward vertically. The lower region of this rib structure can also be rounded. Moreover, a U-shape can be considered for certain applications. Through this rib structure, accurate collection of spray oil and transfer of the collected oil to the bearing location are possible.

[0011] This collection pan opens upward almost vertically. The surface of the collection pan can have a surface finish equivalent to that of the drilled hole on the inside of the side wall. The surface finish of the collection pan and the drilled hole preferably has a surface roughness significantly lower than that of the adjacent rib structure and the inner surface of the side wall. Through this collection pan and the drilled hole penetrating the side wall, the collected lubricating oil can be collected on the outside of the side wall and accurately supplied from the outside to the bearing located there.

[0012] In particular, the drilled hole can be configured to form a collection pan together with the portion located on the inside of the side wall. This means that the collection pan is part of the drilled hole. The collection pan is preferably partitioned, at least partially, from the rib structure that is not included in the drilled hole, in the vertically downward direction. As a result, there is no need to create an undercut in the casting technique, because the undercut required for the collection pan is generated by the drilled hole, and this drilled hole prevents contact between the rib structure and the axial extension of the drilled hole in the vertically downward region.

[0013] In one preferred embodiment, the drilled hole is provided so as to penetrate the side wall perpendicular to the main plane of the side wall. This is particularly advantageous in terms of manufacturing technology because other holes, such as screw holes, are also formed perpendicular to this wall. In this respect, the same tool can be used in this case.

[0014] In one preferred embodiment, the collection pan has an undercut when viewed from a direction perpendicular to the side wall. As a result, the collected spray oil is prevented, at least to the maximum extent, from overflowing into the gearbox housing.

[0015] In one preferred embodiment, the vertical depth of the collection pan is 1 / 3 to 2 / 3 of the diameter of the drilled hole. As a result, it is preferably ensured that the drilled hole is installed through the side wall within a specific tolerance. A vertical depth of 2 / 5 to 3 / 5 of the diameter is particularly preferred. From a functional standpoint, a vertical depth of half the diameter of the drilled hole is particularly preferred.

[0016] In a more preferred embodiment, the housing opening and drilled hole are covered by a housing side cover. In this case, the housing side cover forms an auxiliary housing relative to the original housing housing. This auxiliary housing can be used to store oil to lubricate and cool the bearing before the oil flows out again through the bearing.

[0017] The gearbox housing has a mounting cover, and in a preferred embodiment, the inner wall of this mounting cover curves outward from the inner housing of the gearbox housing. In this case, it is preferably ensured that lubricating oil splashed onto the inner wall of the mounting cover flows outward toward one of the multiple side walls, where it is collected on the side wall surface of the funnel-shaped rib structure. In particular, this curvature of the inner wall is provided to extend in a cross section perpendicular to the side wall and in a vertical direction.

[0018] Furthermore, the problems of the present invention are solved by a method for manufacturing the above-described embodiment of the gearbox housing. In this method, a funnel-shaped tapered rib structure is cast inside one side wall without undercuts when viewed from the vertical direction of the side wall by a casting process, and a collection pan is generated by drilling holes in the side wall in the vertical lower region of the rib structure. In this method, it is advantageous that the rib structure is cast inside the side wall without undercuts. This makes the casting process easier and simpler because there is no need for a casting core for undercut formation, and this casting core does not need to be removed from the undercut later.

[0019] In an advantageous embodiment of the method, the drill hole is drilled from the outside to the inside of the side wall, and the center of this drill hole is located at the vertical height of the leg point of the rib structure. In this case, the center means the central axis of the drill hole. The leg point of the rib structure is formed by the transition from the vertical side wall to the curved part forming the rib structure. This transition is preferably at the lowest point in the vertical direction. Therefore, the central axis of the drill hole is installed so as to be approximately at this leg point, that is, at the transition between the side wall and the rib structure, and approximately half of the diameter of the drill hole extends further within the rib structure, and half of the diameter of the drill hole extends above the rib structure in the vertical direction, that is, away from the rib structure. As already mentioned above, the distribution of what proportion of the diameter of the drill hole extends within the rib structure and the corresponding complementary proportion extends away from the rib structure can be changed from this half split.

[0020] Furthermore, this problem is solved by an industrial application comprising drive means coupled to a gear so as to transmit torque, where this gear is coupled to a mechanical application so as to transmit torque, and this gear is formed with the above-described gearbox housing.

[0021] Furthermore, this problem is solved by data integration comprising data packets integrated in one common data file or distributed in a plurality of different data files for representing the three-dimensional shape and / or its interaction of a gear with the above-described gearbox housing, where these data packets are prepared for executing the manufacture of the gearbox housing, particularly by 3D printing by a 3D printer, and / or for simulating the operating mode of this gearbox housing when processed by a data processing device.

[0022] Hereinafter, the present invention will be illustratively described based on preferred embodiments while referring to the accompanying drawings. However, the features presented below can each constitute an aspect of the present invention individually or in combination. :

Brief Description of the Drawings

[0023] [Figure 1] Vertical cross-section of the gearbox housing; [Figure 2] Another vertical cross-section of the gearbox housing according to FIG. 1; [Figure 3] Detailed view of the rib structure of the gearbox housing according to FIG. 1; [Figure 4] Perspective view of the gearbox housing according to FIG. 1 [Figure 5] Principle diagram of industrial application

Mode for Carrying Out the Invention

[0024] FIG. 1 shows the gearbox housing 10 in a vertical cross-section. The inside 18 of the side wall 12 of the gearbox housing 10 is shown. There is another side wall on the horizontally opposite side, but it cannot be seen because of this cross-section. Further, this gearbox housing 10 includes a floor portion 36 and a cover formed as a removable mounting cover 30. The side wall 12 is provided with a plurality of circular housing openings 14 for accommodating a plurality of bearings not shown in FIG. 1. In the ready-to-operate state, for example, bevel gears or spur gears can be accommodated in this gearbox housing 10 together with corresponding individual components. Further, a lubricating oil storage portion is accommodated in this gearbox housing, and through this, lubrication of both the teeth and the bearings 16 (see FIG. 2) that engage with each other during operation can be performed. This lubrication is performed by at least one rotating gear being immersed in the lubricating oil held in the oil sump at the lower part of the gearbox housing 10, and through this, the lubricating oil is relayed to one or more meshing partners. Due to the rotation of the gear, the lubricating oil is released from the gear by centrifugal force, and as a result, it accumulates as spray oil on the inner wall of the gearbox housing 10 and flows down into the oil sump by gravity.

[0025] As can be seen from Figure 1, the inner surface 18 of the side wall 12 has a structure made up of multiple rib structures 20. Each rib structure 20 is formed by a single projection rising from the main surface. In the simplest embodiment, only one rib structure 20 is formed on the inner surface 18 of the side wall 12, and this rib structure is formed by two ribs 281 and 282 that taper downward in the vertical direction. The funnel-shaped tapered rib structure 20 converges in an almost V-shape downward in the vertical direction, but the ribs 281 and 282 do not necessarily have to meet at a pointed point at the bottom. It is also possible to provide a short horizontal connecting section between the ribs 281 and 282. In all conceivable embodiments, the funnel-shaped tapered rib structure 20 converges into a collection pan 22. The role of this collection pan 22 is to collect oil. In particular, oil coming from above and flowing down the side wall 12 inside the rib structure 20 collects in the collection pan 22. The rib structure 20 and the collection pan 22 are positioned above the center of the housing opening 14 in the side wall 12.

[0026] Figure 2 shows a vertical cross-section through the gearbox housing 10, rotated 90° from Figure 1, with the right side wall not shown in the figure. The left side wall 12, which has a bearing 16 housed in the housing opening 14, can be seen. Here, the bearing 16 is a tapered roller bearing, which will not be described in detail. Other types of bearings may also be provided. The housing opening 14 is closed by a housing side cover 26, which can be held against the side wall 18, for example, by a wide range of screw connections. An auxiliary housing 38 is formed inside the housing side cover 26, facing the side wall 12, and this auxiliary housing 38 is open to the bearing 16 set in the housing opening 14. The vertical cross-section of Figure 2 is made to pass through the rib structure 20 and the center of the collection pan 22 above the housing opening 14. Further, a drill hole 24 can be seen, which penetrates the side wall 12 and forms the collection pan 22 in the lower region of the rib structure 20. This drilled hole 24 opens outside the side wall 12 into the interior of an auxiliary housing 38, which is surrounded by the housing side cover 26. The collection pan 22 formed by the drilled hole 24 inside the gearbox housing 10 is connected to the auxiliary housing 38 via another path of the drilled hole 24 inside the side wall 12. As a result, the lubricating oil collected in the collection pan 22 can reach the auxiliary housing 38 via this other path of the drilled hole 24 inside the side wall 12. The lubricating oil can then enter the bearing 16 from the auxiliary housing 38 and reach it.

[0027] The mounting cover 30 of the gearbox housing 10 is molded so that its inner wall 32 curves outward from the internal housing of the gearbox housing 10. The curved portion 34 of the inner wall 32 extends in a vertically standing cross section perpendicular to the side wall 12, as shown in Figure 2.

[0028] Figure 3 shows details of the rib structure 20 and the drilled hole 24 that penetrates the side wall 12 to form the collection pan 22 on the inside. This drilled hole 24 penetrates the side wall 12 horizontally. This is technically easy to implement as most of the machining steps on the gearbox housing 12 are performed in directions perpendicular to each other anyway. The collection pan 22 has an undercut when viewed from a direction perpendicular to the side wall 12. However, this undercut is not a result of a casting process in which, for example, a corresponding cast core is used, but rather a result of the drilling process of the drilled hole 24 performed from the outside to the inside through the side wall 12, in which the lower region of the rib structure 20 is not completely drilled. The diameter of the drilled hole 24 is D in Figure 3. B It is displayed as follows, and similarly, the vertical depth of the collection pan 33 is T M It is shown as follows: Vertical depth T of collection pan 22 M This is from the base of the collection pan 22 to the height of the undercut rib structure 20. In this example, the diameter D of the drill hole 24 B and the depth T of the collection pan 22 M The ratio to depth T M Diameter D B It is approximately half. As already mentioned above, this ratio may be a different value if it is suitable for the application.

[0029] Figure 4 shows a perspective view of the gearbox housing 10. The front of the housing side cover 26 and the mounting cover 30 are hidden. A drill hole 24 is visible above the housing opening 14 on the right side, and this drill hole forms a collection pan 22 inside the side wall 12 in the leg region of the rib structure 20.

[0030] Figure 5 shows one embodiment of an industrial application 40. This industrial application 40 comprises a drive means 42 formed as, for example, an electric motor, an internal combustion engine, or a hydraulic motor. This drive means 42 is coupled to a gear 44 to transmit torque, which is then coupled to a mechanical application 46. The drive means 42 is formed to output a driving force, which is supplied to the gear 44 via an output shaft 48. The input driving force is converted into speed and torque by the gear 44, taking into account friction losses, and transmitted as output to the mechanical application 46 via an output shaft 50. [Explanation of Symbols]

[0031] 10 Gearbox Housing 12 Side wall 14 Housing opening 16 bearings 18 Inside 20 Rib Structure 22 Collection Bread 24 drill holes 26 Housing side cover 28 Ribs 30 Mounting cover 32 Inner wall 34 Curved section 36 Base 38 Auxiliary storage unit 40 Industrial Uses 42 Driving means 44 gears 46 Mechanical Applications 48 Output shaft 50 Output shaft

Claims

1. A gearbox housing (10) including multiple side walls (12), At least one of the side walls (12) has one or more housing openings (14) for accommodating a bearing (16), On the inner side (18) of one of the plurality of side walls (12), a rib structure (20) is formed above the housing opening (14) and tapers vertically toward the housing opening (14) in a funnel shape. A collection pan (22) is provided where the funnel-shaped tapering rib structure (20) converges. The collection pan (22) is characterized by being formed by a single drill hole (24) that penetrates the side wall (12), The drill hole (24), together with the portion located on the inside (18) of the side wall (12), constitutes the collection pan (22). Gearbox housing.

2. The gearbox housing (10) according to claim 1, characterized in that the collection pan (22) is at least partially separated from the rib structure (20) that is not included in the drill hole (24).

3. The gearbox housing (10) according to claim 1, characterized in that the drill hole (24) penetrates the side wall (12) in a direction perpendicular to the main plane of the side wall (12).

4. The collection pan (22) has an undercut (52) when viewed from a direction perpendicular to the side wall (12), The undercut (52) is formed by a part of the rib structure (20) that is not included in the drill hole (24). The gearbox housing (10) according to feature 1.

5. The vertical depth (T) of the collection pan (22) Ｍ ) is the diameter (D Ｂ The gearbox housing (10) according to claim 1, characterized in that it is between 1 / 3 and 2 / 3 of ).

6. The vertical depth (T Ｍ ) is the diameter (D Ｂ The gearbox housing (10) according to claim 5, characterized in that it is between 2 / 5 and 3 / 5 of ).

7. The gearbox housing (10) according to claim 1, characterized in that the housing opening (14) and the drill hole (24) are covered by a housing side cover (26).

8. The rib structure (20) has at least two ribs (28) that extend toward each other, tapering downward in the vertical direction. １ , 28 ２ The gearbox housing (10) according to claim 1, characterized by being formed by ).

9. The gearbox housing (10) according to claim 1, characterized in that it is provided with one mounting cover (30), the inner wall (32) of which is curved outward from the inner housing portion of the gearbox housing (10).

10. The gearbox housing (10) according to claim 9, characterized in that the curved portion (34) of the inner wall (32) extends in a cross section perpendicular to the side wall (12) and in a vertical direction.

11. The gearbox housing (10) according to claim 1, characterized in that two side walls (12) arranged horizontally opposite each other are provided with funnel-shaped rib structures (20) that taper toward the housing opening above each housing opening.

12. A method for manufacturing a gearbox housing (10) according to any one of claims 1 to 11, The funnel-shaped tapered rib structure (20) is cast on the inside (18) of the side wall (12) by a casting process without creating an undercut when viewed from the vertical direction of the side wall (12). A method characterized by forming the collection pan (22) by forming the drill hole (24) in the lower vertical region of the rib structure (20) in the side wall (12).

13. The method according to claim 12, wherein the drilled hole (24) is drilled from the outside to the inside of the side wall (12), and the center of the drilled hole (24) is located at the vertical height of the leg point of the rib structure (20).

14. An industrial apparatus (40) including a drive means (42) coupled to a gear (44) to transmit torque, The gear (44) is coupled to a mechanical device (46) so as to transmit torque, An industrial apparatus characterized in that the gear (44) is formed in a gearbox housing (10) according to any one of claims 1 to 11.

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