Conical gear drive

Abstract

Bevel gear unit with a gear housing (10) having a surface, which consists of sections and cultivation areas (14, 38, 42, 52, 71), that each section borders at least two cultivation areas (14, 38, 42, 52, 71) and each section, at every point of this section, is continuously convexly curved along at least one of its surface curves, wherein this surface curve is the intersection of an imaginary normal plane belonging to a point of this section with this section, where the cultivated areas are (14, 42, 52, 71), each of which has a bore, is perpendicular or parallel to each other and, in the installed state of the gearbox housing (10), the mounting surfaces (14, 42, 52, 71) are covered by corresponding surfaces of attached devices and / or by a suitable cover element (20), wherein an input side (50) has a third mounting surface (52) for flange mounting a motor, wherein the outer edge (54) of the third mounting surface (52) forms a continuous uninterrupted circle, the surface is coated with a non-corrosive and / or non-stick polymer.

Description

[0001] The invention relates to a bevel gear with a gear housing.

[0002] DE 201 06 655 U1 discloses a clean room geared motor having a motor section and a gear section which are connected to each other and form a structural unit, wherein the structural unit has a smooth surface.

[0003] From US 2006 / 0 156 861 A1, a gearbox housing is known as the closest prior art.

[0004] A differential mechanism is known from US 2006 / 0 172 848 A1.

[0005] An axle housing cover with variable thickness is known from DE 102 08 392 A1.

[0006] A differential is known from DE 41 15 304 A1.

[0007] A geared motor is known from DE 10 2006 053 668 A1.

[0008] A housing for a gearbox is known from DE 20 2006 014 874 U1.

[0009] Surface treatment techniques are known from the publication MÜLLER K.-P.: Textbook on Surface Technology. Braunschweig / Wiesbaden: Friedr. Vieweg & Sohn Verlagsgesellschaft mbH, 1996. - ISBN 978-3-322-89804-3 [e-Book].

[0010] A pump drive is known from US 2005 / 0 084 392 A1.

[0011] A motor unit is known from WO 2007 / 121 759 A1.

[0012] Gearmotors are known from the SEW EURODRIVE publication: ASEPTIC Gearmotors. Bruchsal, February 2005 (Catalog 11312300 / DE). - Company publication.

[0013] Pumps are known from the publication APV AxFlow - SPX Brand: APV DW Pumps - Outperform All Others. Düsseldorf, August 2008 (7000-02-08-2008-US). - Company publication.

[0014] From the publication WRIGHTFLOW TECHNOLOGIES: In: Wright Flow Technologies Ltd., BN23 6PT Eastbourne, UK: classic+ Lohkoroottoripumppu. 2008 (FMT ACO / WFT / A4 Classic+ Finnish / 110). - Pumps are also known from the company's lettering.

[0015] The invention is based on the object of developing a gear housing of a bevel gear transmission.

[0016] According to the invention, the object is achieved with the gear housing of the bevel gear according to the features specified in claim 1.

[0017] Important features of the invention in the gear housing of the bevel gear are that the gear housing has a surface which consists of sections and mounting surfaces in such a way that each section adjoins at least two mounting surfaces and each section is continuously convexly curved along at least one surface curve, wherein the surface curve is the intersection of an imaginary normal plane belonging to a point of the section with the respective section.

[0018] In other words, the transmission housing has a surface consisting of sections and attachment surfaces, meaning, in particular, that it has only sections and attachment surfaces, with the sections being convexly curved in at least one direction. The surface curve runs along one direction. The normal plane is perpendicular to a tangent vector of a point on the surface or section.

[0019] The advantage here is that liquids drain well off the surface of the gearbox housing and contaminants can be easily removed without the need for drainage channels.

[0020] In a further embodiment, the gear housing for a bevel gear has a surface which consists of sections, planes and mounting surfaces such that each section borders on at least two mounting surfaces or planes and each section is continuously convexly curved along at least one surface curve, wherein the surface curve is the intersection of an imaginary normal plane belonging to a point of the section with the respective section and wherein the planes are arranged such that each plane, in the intended installation positions of the gear housing, encloses an angle (α) with an imaginary plane (E) whose normal vector is collinear, i.e. parallel, to the direction of gravity, the angle being greater than or equal to three degrees.

[0021] Or to put it another way, in the further embodiment, the gear housing for a bevel gear has a surface consisting of sections, planes, and mounting surfaces. When the gear housing is used in a system, the gear housing is installed in an installation position, wherein the sections are convex in one direction and the planes enclose an angle of greater than or equal to three degrees with an imaginary plane whose normal vector is collinear with gravity. The advantage here is that, in any reasonable installation position of the gear housing, fluids drain well off the surface of the gear housing and contaminants are easily removed without the need for drainage channels.

[0022] In a further embodiment, the sections have a radius of curvature greater than approximately 3 mm, in particular greater than approximately 6 mm. This is advantageous in that fluids drain well from the surface of the transmission housing, and contaminants can be easily removed without the need for drainage channels. Furthermore, these curves facilitate demolding when manufacturing the transmission housing as a cast part.

[0023] In the embodiment according to the invention, the mounting surfaces, which preferably have a bore, are perpendicular or parallel to one another. When the gear housing or a corresponding gear unit is installed, the mounting surfaces are covered by corresponding surfaces of attached devices and / or by a suitable cover element. This is advantageous in that the gear housing can be easily integrated into a system, allowing fluids to drain smoothly from the surface of the gear housing and allowing contaminants to be easily removed without the need for drainage channels.

[0024] In another embodiment, a surface of the cover elements facing away from the gear housing is shaped to correspond to the sections or sections and levels. The advantage here is that the gear housing has good cleaning properties while still offering the flexibility of a normal gear housing.

[0025] In a further embodiment, the regions and thus the surface comprise an intermediate surface that is convex in a first direction and concave or convex in a second direction. In particular, the first direction is approximately perpendicular to perpendicular to the second direction. This is advantageous in that fluids drain well off the surface of the transmission housing and contaminants are easily removed.

[0026] In a further embodiment, the gear housing has an output side in which a first and second continuous recess are machined, wherein the first and second recesses form a common end face, which represents a first mounting surface. Advantageously, the common end face can be easily covered, and at the same time, the second recess can be covered by a cover provided for this purpose, without creating critical depressions and / or cavities.

[0027] In a further embodiment, one mounting side of the transmission housing has a through-opening with a second mounting surface for a cover, the outward-facing surface of which, when installed, is shaped like a gable roof with a slope of greater than or equal to three degrees. This is advantageous in that fluids drain well off the surface of the cover and thus the transmission housing, and contaminants are easily removed.

[0028] In the embodiment according to the invention, one input side has a third mounting surface for flange-mounting a motor, with the outer edge of the third mounting surface forming a continuous, uninterrupted circle. The advantage here is that no cavities or recesses are created between the motor and the gearbox housing. This creates a drive unit that is easy to clean.

[0029] In another embodiment, the gear housing is made of stainless steel, particularly GX5CrNi19-10 stainless steel. This is advantageous because the gear housing is easy to clean and the surface is resistant to even more aggressive cleaning agents.

[0030] In the embodiment according to the invention, the surface is coated with a non-corrosive and / or non-stick polymer coating. This is advantageous in that the gear housing is easy to clean and the surface is resistant to even more aggressive cleaning agents.

[0031] In a further embodiment, the surface has an arithmetic mean roughness Ra between approximately 0.8 micrometers and approximately 6.0 micrometers, preferably between approximately 2.5 micrometers and approximately 3.5 micrometers. This is advantageous because contaminants and bacteria have a smaller contact area with the surface of the gear housing without sinking into recesses on the surface. This results in a lower adhesion force than with a smooth surface, and the gear housing is easier to clean.

[0032] In another embodiment, the gear housing has a reinforcement on an inner surface. This is advantageous because the surface of the gear housing has no contours or projections to which contaminants adhere more easily or are difficult to flush away.

[0033] Key features of a process for manufacturing a gearbox housing include casting the gearbox housing from stainless steel and then grinding and / or electropolishing the gearbox housing. The advantage here is that a conventional manufacturing process can be used, which is enhanced with an inventive process step.

[0034] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0035] The invention will now be explained in more detail using exemplary embodiments with reference to the drawings. They show, purely schematically: Fig. 1 a perspective top view of a transmission housing according to the invention; Fig. 2 a bottom view of the Fig. 1 shown gearbox housing; Fig. 3 a rear view of the Fig. 1 shown gearbox housing; Fig. 4 a section through the Fig. 1 gearbox housing shown; Fig. 5 a perspective top view of a lid for the Fig. 1 gearbox housing shown; Fig. 6 a perspective top view of an intermediate disc for the Fig. 1 shown gearbox housing; and Fig. 7 a perspective top view of a torque support for the Fig. 1 shown gearbox housing.

[0036] Fig. 1 shows a top view of a gear housing 10 according to the invention for a bevel gear. The desired functionality of a bevel gear dictates several design features for the gear housing 10. In particular, the gear housing 10 has an input side 50 and an output side. In particularly preferred embodiments, the gear housing 10 has a first output side 30 and a second output side 31 opposite the first output side 30. The first and second output sides 30, 31 each lie in a mutually parallel output plane, which is perpendicular to an input plane in which the input side 50 lies.

[0037] The gear housing 10 has a surface which consists of sections, mounting surfaces and planes. By "consist of" is meant here that the surface only has sections, mounting surfaces and planes. The planes are non-curved, i.e. flat planes, within the scope of the accuracy usual for production as a cast part or with machining techniques. The planes are arranged such that, when the gear housing 10 is used in a system, the planes enclose an angle α, the magnitude of which is greater than or equal to three degrees, with an imaginary plane E, whose normal vector is collinear with the force of gravity g, in every occurring installation position of the gear housing 10. Fig. 3 the angle α between a second plane 16 and the imaginary plane E is drawn.

[0038] A first recess 32 and a second recess 34 are formed in the first output side 30. The first and second recesses 32, 34 are circular and have different diameters. The first recess 32 has a larger diameter and serves for mounting an output shaft. In the case of a solid output shaft, the solid shaft protrudes from the first recess 32. During assembly of the finished gearbox with a hollow output shaft, a shaft of a device to be driven is inserted into the hollow shaft and thus into the first recess 32.

[0039] The second recess 34 serves for mounting an intermediate shaft on which, for example, a ring gear of a bevel gear stage can be mounted. A first mounting surface 14 forms a common end face of the first and second recesses 32, 34.

[0040] In the first output side 30, 14 bores are provided around the first recess 32 in the first mounting surface, forming a first bore pattern 33. This first bore pattern 33 can be used, for example, to attach the gear housing to a driven device in various discrete installation positions.

[0041] The input side 50 has a circular opening 56 with a third mounting surface 52 as the end face. Bores are arranged around the circular opening 56 in the third mounting surface 52, forming a second hole pattern 53. The second hole pattern 53 serves to attach a motor or a motor adapter to the transmission housing 10.

[0042] To increase the flexibility of the gearbox housing, the second output side 31 is designed analogously to the first output side 30.

[0043] The sections are each spanned by a first and a second direction. The sections are convexly curved at least along a first direction, meaning a first surface curve is convexly curved. Along a second direction, the sections are advantageously also convexly curved, meaning a second surface curve is also convex. However, in certain sections, concave curvatures along a first or second direction cannot be avoided.

[0044] It's important to note that there is always a convexly curved surface curve in every section between two cultivated areas. This does not mean that a connecting line between two cultivated areas must be convexly curved.

[0045] For every point on every segment of the surface, a normal plane can be found through the point. This plane, when intersected with the corresponding segment, forms a surface curve with only convex curvature. "Only convex curvature" is synonymous with "continuously convex curvature." The normal plane intersects the corresponding segment perpendicularly at the point.

[0046] Each section borders at least two cultivation areas or levels. This means that the sections border either at least two cultivation areas or two levels, or one cultivation area and one level. However, the sections can also border multiple cultivation areas or levels.

[0047] Each section is convexly curved along at least one surface curve, with the surface curve being the intersection of an imaginary normal plane belonging to a point of the section with the respective section. The normal plane intersects the surface perpendicularly at that point. The normal plane can be rotated in each section so that its intersection with the surface section creates a convex surface curve. This creates a surface curve that is only convexly curved over the entire section.

[0048] The surface of the gearbox housing can be divided into sections, planes, and mounting surfaces in such a way that the conditions for the sections, mounting surfaces, and planes described above are met. This results in a bulbous appearance of the gearbox housing, as each section is curved outward in at least one direction.

[0049] In the Fig. In the exemplary embodiment of a transmission housing according to the invention shown in Figure 1, the sections are each convexly curved in a first direction. For easier identification, the sections are further divided into regions. A first region 12 is convexly curved in a first direction and, within the limits of manufacturing accuracy, is flat in a second direction perpendicular to the first direction. Other regions, such as an edge-like region 13, are convex in their first direction and similarly convex in their second direction. The first region 12, the edge-like region 13, and the cylinder jacket surface 17 lie in a section between the third mounting surface and the first plane 15.

[0050] A further region, formed as an intermediate surface 19 between one cylindrical surface region 18 and another region, is convexly curved in a first direction and concavely curved in a second direction, thus forming a saddle surface. The intermediate surface 19 extends around the first and second recesses 32, 34. The cylindrical surface region 18 and the intermediate surface 19 are located in a further section of the surface between the first mounting surface 14 and the mounting surface 71 for venting.

[0051] Since every section of the surface is convex in at least one direction, the formation of drainage channels is eliminated. This simplifies the casting mold and the entire manufacturing process of the gear housing 10. Interfering protrusions are also avoided. The structurally necessary reinforcements are located on an inner surface 60 of the gear housing 10. Fig. 4 shows, by way of example, an elongated thickening 62 and a semicircular thickening 64 as reinforcement on the inner surface 60 of the gear housing 10. This also simplifies post-treatment of the surface of the gear housing 10.

[0052] The mounting surfaces are uncurved and, when the gear housing 10 is installed, are covered by corresponding cover elements and / or attached devices. The sealing elements required between the cover element or attached device and the gear housing 10 are arranged in such a way that no gaps or covered cavities are created. Only the outer edges of the mounting surfaces are edges in the true sense, i.e. edges which, within the scope of the manufacturing possibilities, are formed by two directly abutting surfaces. The abutting surfaces of the edges are usually formed by a section of the surface and a mounting surface. Transitions between two sections are Fig. 1 shown embodiment is designed as sections.

[0053] The first mounting surface 14 forms a common end face for the first recess 32 and the second recess 34 of the first output side 30. The second output side 31 is designed accordingly.

[0054] Tests have shown that a curvature radius of approximately 6 mm is advantageous for the concave and convex curves, and a curvature radius of approximately 3 mm is just about adequate for allowing liquids to drain well from the surface and for easy removal of contaminants. Therefore, in a particularly preferred embodiment, the surface, except for the outer edges of the attachment surfaces, has radii of curvature along any direction that are greater than 3 mm; particularly advantageously, the radii of curvature are greater than 6 mm. In particular, an edge-like region 13 is rounded to exhibit the preferred radii of curvature.

[0055] The radius of curvature is defined by the radius of a circle that fits snugly against the surface. Curvature is the inverse of the radius of curvature.

[0056] Likewise, tests have shown that a plane that is flat within the scope of manufacturing accuracy should enclose an angle of greater than 3 degrees with an imaginary plane whose unit vector is collinear with gravity.

[0057] In the Fig. In the embodiment shown in Figure 1, the transmission housing 10 has a first through-bore 70 and a second through-bore 72. These are closed by a screw plug or a vent valve when the transmission is assembled. Depending on the installation position of the transmission, the vent valve can be screwed into the first through-bore 70 or the second through-bore 72. The first and second through-bores 70, 72 are surrounded by a corresponding mounting surface, such as a mounting surface 71 for the vent.

[0058] Fig. 2 shows a bottom view of a foot side of the Fig. 1. The base side has a mounting surface as a base surface 38 and a third plane 35. When installed in the appropriate position, the base surface 38 serves as a support surface for the gear housing 10. In a not-shown embodiment of the gear housing 10 for a slip-on gear, this support surface is not present, and the third plane 35 extends almost over the entire length of the base side.

[0059] A mounting side 40 of the gear housing 10 according to the invention is in Fig. 3 in the rear view of the gearbox housing 10.

[0060] The mounting opening 46 is used for mounting or inserting the shafts and gears arranged in the gear housing 10. The mounting opening 46 is framed by a second mounting surface 42, which has holes with internal threads. After the gearbox has been mounted in the gear housing 10, a Fig. 5 shown cover 20 screwed on.

[0061] The cover 20 is essentially rectangular in shape and closes the mounting opening 46. The surface of the cover itself has sections, levels, and mounting surfaces designed to match the gear housing 10. Mounting holes 76 are provided in the cover. Screws are passed through these mounting holes 76, with which the cover 20 is attached to the gear housing 10. The screws are designed in such a way that they Fig. 5. These counter surfaces also form mounting surfaces within the meaning of the invention.

[0062] A base area of ​​the surface of the cover 20 forms a gable roof surface 44, whose gable divides the surface into two halves along the long side of the rectangle. The gable roof surfaces form an angle of at least three degrees with an imaginary base plane of the cover 20.

[0063] Mounting surfaces of the cover 20 serve as a support for corresponding fastening screws for screwing the cover 20 to the second mounting surface 42. The mounting surfaces can be covered by suitably shaped cover elements such as screw heads or shims, so that the final visible surface in the mounted state has only convex sections or sections that are convex at least in one direction.

[0064] A special mounting surface 74 of the cover 20 projects into the gable roof surface and has a cover bore 73 into which a vent valve or a screw plug can be screwed.

[0065] Fig. 4 shows that in Fig. 1 in section. Reinforcements of the gear housing 10, which in the prior art are usually formed on the housing surface, are relocated to the interior of the gear housing 10 in the gear housing 10 according to the invention. Semicircular thickenings 64 or elongated thickenings 62, for example, are formed on the inside of the gear housing 10 as reinforcements. Nevertheless, the usual gearing parts and shafts, for example, for a bevel gear transmission with two spur gear stages and one bevel gear stage, can be installed in the gear housing according to the invention.

[0066] One in Fig. The intermediate disk shown in Figure 6 has a substantially egg-shaped base surface which is substantially congruent with the first mounting surface 14. A drilling pattern formed in the intermediate disk corresponds to the first drilling pattern 33 around the first recess 32 in the first mounting surface 14. The intermediate disk 24 has a recess 75 corresponding to the first recess 32. When the intermediate disk 24 is mounted on the first mounting surface 14, the intermediate disk covers the second recess 34. The second recess is thus securely closed without creating an externally accessible depression or cavity in the overall surface of the assembled transmission. At the same time, the intermediate disk 24 can be designed such that a convex surface is present above the second recess 34.

[0067] The second output side 31 can be covered analogously or by a further cover element which covers both recesses of the second output side 31 without leaving any opening.

[0068] Fig.7 shows a torque arm 26 whose surface is designed to match the surface of the transmission housing 10. The torque arm 26 has a larger and a smaller approximately annular element 90, 92, which are connected to one another via two legs 94, 96. The two legs 94, 96 are formed in one plane on the circumferences of the approximately annular elements 90, 92 and are at an angle to one another, so that the angle opens towards the larger approximately annular element 90. The larger approximately annular element 90 has flattened end faces into which a further hole pattern 98 is made, which corresponds to the first hole pattern 33. Thus, the torque arm 26 can be screwed to the transmission housing 10 in various positions predetermined by the further hole pattern 98, with the intermediate disk 24 arranged therebetween.The smaller, approximately annular element 92 serves to fasten the torque support 26 to a non-rotatable device.

[0069] Flanges shaped to match the surface of the gear housing 10 can also be attached to the mounting surfaces, in particular the first mounting surface 14 or the intermediate plate 24 or the torque support 26 and the third mounting surface 52. These serve as adapters for connecting to corresponding drive devices, such as electric motors, driven devices, clutches, brakes, etc.

[0070] Advantageously, the gear housing 10, the intermediate plate 24, and the torque support 26 are made of stainless steel, particularly GX5CrNi19-10 stainless steel. Due to the high strength and the reinforcements on the inside of the gear housing, ventilation can be omitted under suitable operating conditions. The through holes 70, 72 and the corresponding mounting surfaces 71 can then be eliminated. This also eliminates the need for a suitable cover element. Likewise, the surface geometry can be designed with fewer concave curves. For example, the second plane 16 is then continued in the direction of the input side 50 and forms a continuous plane with the first plane 15.

[0071] Known gear housings (not shown here) have so-called output pockets on certain mounting surfaces, particularly on the input side 50. To remove attached devices, a corresponding tool is inserted into the output pocket to lever the attached device away. The output pockets are usually designed as recesses accessible from the surface, in particular wedge-shaped ones, for example in the third mounting surface 52 of the input side 50. The output pockets interrupt an edge 54 of the third mounting surface of the input side 50 or deform this edge 54. In known gears, the output pockets form cavities accessible from the outside. In a preferred embodiment of the invention, these cavities are omitted, and an outer edge 54 of the third mounting surface 52 forms a continuous circle. The third mounting surface 52 is designed as an end face of the input side for flanging a motor.

[0072] In a further embodiment, not shown, the surface consists only of sections and attachment surfaces. The sections and attachment surfaces are designed as described above.

[0073] The gear housing 10 is advantageously manufactured as a cast part. The surface of the gear housing 10 is then ground and / or electropolished so that the surface has an arithmetic mean roughness Ra between approximately 0.8 µm and approximately 6.0 µm, preferably between approximately 2.5 µm and approximately 3.5 µm. This has the advantage over smooth surfaces that dirt particles or other contaminants, such as bacteria, are not in full contact with the surface. This reduces the adhesion force between bacteria or dirt and the surface, making the contaminants easier to remove.

[0074] In a process related to the invention, the surface is additionally coated with an anti-corrosion and / or non-stick layer. A polymer such as polytetrafluoroethylene is used. List of reference symbols 10 Gearbox housing 12 first area 13 edge-like area 14 first cultivation area 15 first level 16 second level 17 Cylinder surface 18 Cylinder surface area 19 Intermediate surface 20 lids 24 intermediate disc 26 Torque support 30 first output side 31 second output side 32 first recess 33 first drilling pattern 34 second recess 35 third level 38 overlying cultivation area 40 Mounting side 42 second cultivation area 44 gable roof area 46 Mounting opening 50 Input side 52 third cultivation area 53 second drilling pattern 54 outer edge 56 circular opening 60 interior surface 62 elongated thickening 64 annular thickening 70 first through hole 71 Mounting area for ventilation 72 second through hole 73 Cover hole 74 special mounting surface of the lid 76 mounting holes 90 larger approximately ring-shaped element 92 smaller approximately ring-shaped element 94, 96 two legs 98 additional drilling pattern

Claims

[1] Bevel gear with a gear housing (10) with a surface, which consists of sections and cultivated areas (14, 38, 42, 52, 71), that each section borders on at least two cultivated areas (14, 38, 42, 52, 71) and each section, at each point of this section, is continuously convexly curved along at least one of its surface curves, this surface curve being the intersection of an imaginary normal plane belonging to a point of this section with this section, where the cultivated areas (14, 42, 52, 71), which each have a bore, are perpendicular or parallel to each other and, in the installed state of the gear housing (10), the mounting surfaces (14, 42, 52, 71) are covered by corresponding surfaces of attached devices and / or by a suitable cover element (20), wherein an input side (50) has a third mounting surface (52) for flanging a motor, wherein the outer edge (54) of the third mounting surface (52) forms a continuous uninterrupted circle, wherein the surface is coated with a non-corrosive and / or non-stick polymer. [2] Bevel gear according to claim 1, characterized by that the sections have a radius of curvature of greater than approximately 3 mm, in particular greater than approximately 6 mm. [3] Bevel gear according to one of the preceding claims, characterized by that a surface of the cover elements (20) facing away from the gear housing (10) is shaped according to the sections. [4] Bevel gear according to one of the preceding claims, characterized bythat the sections and thus the surface comprise an intermediate surface (19) which is convex along a first surface curve and concave or convex along a second surface curve through the same point. [5] Bevel gear according to claim 4, characterized by that the first normal plane of the first surface curve is approximately perpendicular to perpendicular to the normal plane of the second surface curve. [6] Bevel gear according to one of the preceding claims, characterized by that the gear housing (10) has an output side (30, 31) in which a first and second continuous recess (32, 34) are machined, wherein the first and second recess (32, 34) form a common end face which represents a first mounting surface (14). [7] Bevel gear according to one of the preceding claims, characterized bythat the gear housing (10) is made of stainless steel, in particular of stainless steel GX5CrNi19-10. [8] Bevel gear according to one of the preceding claims, characterized by that the surface has an arithmetic mean roughness Ra between approximately 0.8 µm and approximately 6.0 µm, preferably between approximately 2.5 µm and approximately 3.5 µm. [9] Bevel gear according to one of the preceding claims, characterized by that the gear housing (10) has a reinforcement (62, 64) on an inner surface (60).

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