Funk's Planetary Input Drive - Engineering and Application

This paper discusses the design and development of the Funk two-speed planetary input drive. A detailed description of the “power shift” concept through the use of hydraulically actuated spring returned clutch packs is presented. Diagrams which display the internal operation and trace the power flow through the drivetrain are presented for clarification along with simplified circuitry diagrams of the developmental hydraulic system.

Developmental testing to substantiate product reliability and unit performance is reported, along with some typical applications where the two-speed input drive could be employed.