Optimized crowning in bevel gear wheels of a bevel gear transmission
AssigneeSchottel GmbH
InventorManfred Heer
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AssigneeSchottel GmbH
InventorManfred Heer
Estimating the term…
The invention relates to a method for producing a bevel gear wheel, in particular for rudder propellers, the teeth of which have a macro geometry specific to the gear wheels, the teeth of which can be described by flank and profile lines, the flanks of which have a tooth flank micro topography and the bearing surface of which represents the contact region of the inter-meshing teeth. The crown of a tooth flank corresponds to the elevation of the tooth flank center with respect to the tooth flank edge, wherein the course of the height and width crowns of the flank surface is substantially shaped like a circular arc. By means of precise material removal, the micro topography of the tooth flank and thus the bearing surface is optimized firstly in that the material removal is carried out such that the end relief on the tooth flank surface is reduced toward the tooth heel side and the tooth toe side, an area having a greater length and width comes into engagement on the flank and thus an enlarged bearing surface is present, and secondly in that the course of the crown the crown of a tooth flank follows an approximately logarithmic, elliptical and/or an exponential curve shape, which runs through the point of contact, when the ease-off is viewed with no load, in a longitudinal section in the flank sectional surface and/or in a profile section in the profile sectional surface.
A method of making a bevel gear having teeth that are described by flank and profile lines, the flank having a tooth flank micro topography and having a contact area that represents a contact region of engaging teeth, wherein a camber of a tooth flank corresponding to an elevation of a tooth flank center, with respect to a tooth flank edge, is characterized in that by precise material removal, a micro topography of the tooth flank, and thus the contact area, is optimized such that an end thickness on the tooth flank is reduced toward a tooth heel side and a tooth toe side and an area having a greater length and width comes into engagement on the tooth flank to enlarge a contact area, wherein when an ease-off is viewed with no load, the shape of the camber of a tooth flank, in a longitudinal section of a flank sectional surface and/or in a profile section of a flank sectional surface follows an approximately logarithmic, elliptical or exponential curve that runs through a point of contact, wherein a milling cutter follows a machining curve that is superimposed with a correction curve to generate an optimized load-bearing contact area and forms the profile lines and/or the flank lines along an entire tooth width and tooth height of the logarithmic, elliptical or exponential correction curve, wherein the correction curve lies between an upper and lower limit curve, the teeth being designed as a helical or spiral tooth system.
Dependencies are inferred from the claim text.