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SPUR GEAR WITH CIRCULAR SECTOR-SHAPED DIRECTRIX AND MILLING MACHINE FOR MAKING SPUR GEAR TOOTH SYSTEM WITH CIRCULAR SECTOR-SHAPED DIRECTRIX
SPUR GEAR WITH CIRCULAR SECTOR-SHAPED DIRECTRIX AND MILLING MACHINE FOR MAKING SPUR GEAR TOOTH SYSTEM WITH CIRCULAR SECTOR-SHAPED DIRECTRIX
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机译：圆弧形扇形齿轮的齿形齿轮和带圆弧形扇形齿轮的齿形齿系统的铣床
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摘要
The invention relates to a spur gear having a circular sector-shaped tooth system and to a milling machine for making such a tooth system. According to the invention, the gear has some anti-homologous flanks (a and b) of a tooth (c) of a circular sector-shaped tooth system, having some different radii which are equal to some corresponding teeth arrangement radii of a working milling head (9). The claimed machine has a milling head (9) having some front teeth which are equiangularly arranged along a circle, said milling head being driven by a main shaft (8) and the teeth being generated kinematically, with discrete indexing, using the principle of rolling a piece to be processed (46) over a fixed rack, with this purpose the piece (46) being simultaneously driven into a rotation motion by means of a kinematic linkage of circular advance of the piece (46), the motion being transmitted thereby from an electric motor (11) to a gearing comprising a worm (42) and a worm wheel (43), said gearing driving a shaft (44) integral with a plate (45) on which the piece (46) is fixed, either directly or by means of another piece (47), as well as into a forward motion by means of a kinematic linkage of longitudinal advance, by which the motion is transmitted from the same electric motor (11) to a leading screw (66), the rotation thereof resulting into the forward motion of a nut (67) and of a longitudinal slide (52) which rotatably supports the plate (45), the two kinematic linkages having a rigid kinematic link, whose transmission ratio can be adjusted by some change gears (27, 28, 29 and 30), the final parts of said kinematic linkages forming a rolling linkage.
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