{
  "abstract": "A logarithmic hollow shaft speed reducer comprising a compact, modular two-stage rotary system with independently selectable coupling paths. The first stage produces coaxial outputs directed to either the ring, sun, or carrier of a standalone second-stage differential planetary gear. This architecture enables multiple torque-speed modes—high-speed/low-torque, balanced, and high-torque/low-speed—without altering drive element configuration. The speed reducer's modularity and clarity support cost-effective manufacturing and flexible deployment.",
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  "source_date": "2026-04-14",
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  "title": "Logarithmic hollow shaft speed reducer",
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