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Investigation For Output Torque Of A Low Pressure Water Hydraulic Planetary Gear Motor

This study concerns a Planetary Gear Motor which can be driven by low pressure as same as civil tap water pressure. Low pressure water hydraulic system has advantages such as low cost, safety and easy usage as well as no risk to pollute the environment if leakage happens. The purpose of this paper is to introduce the structure of the Low Pressure Water hydraulic Planetary Gear Motor (LPW-PGM) and to explain the supposed mechanism of output torque generation and the method to calculate the theoretical output torque. The theoretically calculated output torque is compared with the measured under the condition of very low constant rotational speed. As a result, it is found that there is a difference between the calculated and measured results, and the major of difference is caused by the friction at the meshing parts on the teeth of the stator, rotor and planetary gears. The experimental result shows that a surface treatment on the planetary gears with solid lubricant film which contains Graphite makes the output torque efficiency increase about 15%. In addition, the planetary gears made of PEEK and brass are also tested.