Input Torque Transmission: The cutting motor generates rotational speed, which is first reduced via a conventional fixed-shaft gear train before entering the planetary gear stage.
Speed Reduction and Torque Amplification: The sun gear drives the planetary gears. Constrained by the stationary ring gear, the planetary carrier rotates, thereby achieving a high reduction ratio that converts the high-speed input into the high-torque output required by the cutting drum.
Dynamic Load Management: The planetary system manages "pick load" fluctuations—the intense impact forces generated when the cutting picks strike the coal seam.
Gear Meshing and Lubrication: The gears operate within a lubricated environment; notably, the size and concentration of coal dust particles suspended in the gear oil paradoxically influence the thickness of the lubricating oil film (exhibiting a positive correlation), thereby affecting the contact characteristics of the rocker arm gears.
Output to the Drum: The final output from the planetary carrier is transmitted directly to the coal cutter drum, thereby facilitating the cutting of the coal face—a process that typically involves a complex two-stage planetary gear reduction system.
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