プラネタリーギヤ型低圧水圧モータの出力トルク向上に関する研究

概要

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Low pressure water hydraulic system has many advantages, such as environmental friendliness, safety and easiness in usage. This paper regards a Planetary Gear Motor (PGM) which can be driven by low pressure comparable to domestic tap water pressure. We aimed to improve torque characteristics of the PGM. As possible causes of decreasing the output torque, the torque losses by friction and pressure loss induced inside the PGM are focused on. The output torque is measured under a condition of very low constant rotational speed to eliminate the effect of the pressure loss. In order to reduce friction at the meshing parts on teeth of planetary gears and rotor, the three kind of planetary gears, which are made of stainless steel treated with solid lubricant film, PEEK and brass, are tested. The result shows that the treatment with solid lubricant film and PEEK have a good effect on increase of the output torque. Torque losses induced at some parts other than meshing teeth are also investigated. Experiments are carried out also under the condition of driving speed with 100 to 300 rpm. And, the effect of pressure loss is discussed by simple theoretical calculation.
2012-01-31