A splined yoke is a frequently-used component in PTO system, widely used in agricultural machinery. It connects the PTO shaft and transmits torque. 

A splined yoke typically consists of internal splines and external splines. The internal splines are fixed to the PTO shaft. The external splines connect to another component, such as a flange. This structure makes the splined yoke ensure stable and efficient power transmission.

The splined yoke has a specialized structural design. (It usually features longitudinal key grooves that match with the corresponding key slots on rotating parts of the PTO shaft.) This design allows the rotating part to synchronize with the PTO shaft and enable longitudinal sliding along the shaft when needed. This allows the machinery to flexibly adapt to different working conditions.