| 摘要 |
Face-gear transmissions have been used hitherto only for secondary applications, with little running hours and low loads. They form a type of underdeveloped angle transmissions. When analyzing said underdevelopment, it was surprisingly found that well-known gear theory had not been applied correctly. Especially the teeth-tip-height can be increased considerably in the region where the face-gear teeth have increased pressure angles, resulting in considerably increased loading capacity and meshing quotient, all based on meshing cooperation with standard cylindrical gears with either straight (spur) or helical teeth. The angle between the transmission shafts may be 90 DEG , less or over, the shafts may intersect or cross. In case involute toothing is chosen for the cylindrical gear wheel, all well-known advantages remain valid, thus alignment of the transmission is considerably less critical than with bevelled transmissions, axial-pinion loads are less or absent, loading capacity is comparable or better and transmission ratios surpassing approximately 1:5 become the more attractive. In many cases less transmission steps will be possible, reducing size and cost. Simple replacement becomes possible, without any alignment problems. Face gear transmission now may be used for primary, high load, long-life industrial applications. |
