In the design, the application of gear shaft is generally not in the following situations:
1. Gear shafts are usually small gears (gear with few teeth).
2. gear shaft is generally at the high speed (that is, low torque level).
3. gear shaft generally rarely as a variable speed sliding gears, generally are fixed running gears, one is because of the high-speed stage, its high speed is not suitable for sliding speed.
4. the gear shaft is the shaft and the gear synthesis one whole, however, in the design, or to shorten the length of the shaft, too long one is not conducive to the upper hobbing machine processing, the second is the shaft is too long to lead to the shaft to increase the mechanical strength (such as rigidity, deflection, bending, etc.).
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