RACK-AND-PINION MECHANISM OF AN AMPLIFYING SERVOSYSTEM

When driving segment gear 1, meshing with the rack of valve spool 2, is turned, spool 2 is shifted to the right or left of the neutral position (as shown). This admits fluid under pressure into the system through passage a, the holes in guide sleeve 3 and passages and grooves to annular groove d of the spool. Depending upon the position of valve spool 2, fluid is delivered to one of the ends of cy…