H4CV-25-C ding to DIN It is possible to calculate accordin Helical gear reducers H4

Flender/Flender Gear Units/Helical gear reducers H4

he octoid gears are kinematically exact. What is termed as the spherical involute would also be suitable as tooth prole for bevel gears. This tooth form has virtual crown gear with curved tooth ank prole whose direction of curvature changes on the pitch plane. The tooth anks are created by unrolling conical envelope from the base cone, but as they can only be manufactured point by point, this form of gear is of no practical interest. Fig. 2.1 Denition of an octoid gear [ NIEM8.3 ]2.2 Gear Geometry 2 2.2.4.2 Tooth Depth and Blank Geometry The progression of tooth depth along the face width and the blank geometry of bevel gears depend essentially on the chosen manufacturing method (see Table 2.. It is also impossible to determine the geometry of bevel gears without knowing what cutting method will be used. For simplication, Fig. 2.1 denes the most important tooth proportions on the basis of straight bevel gear teeth: The tooth depth may be constantor uniformalong the face width or may increase continuously from toe to heel and is measured perpendicularly to the pitch cone. Tooth depth and root angle determine the size and shape of the blank. The tooth thickness is variable along the face width and is measured on the pitch cone in the transverse or normal section. The slot width is dependent on the cutting method and is usually tapered. Only in the cases of the Palloidmethoda continuous indexing processand the Completing methoda single indexing process (see Sect. 2.is the slot width constant in the normal section along the face width. In the Completing method, this is achieved by tilted root line as indicated in Fig. 2.1, again showing straight bevel gear teeth for simplicity. In all other cases, the slot width is determined by the structure of the tool, the point width and the tool tip radius. Along the pitch cone of bevel gear (.. in the pitch plane of the crown gear), the space width in the normal section is usually not constant. The exception is the P