Position displacement alterable attachment between a plurality of converters and a single drive element, in particular for electrohydraulic servo valves

摘要

An electrohydraulic servovalve having a pair of linear, variable, differential transducers (LVDT) affixed thereto in side by side relationship. A spool valve driven by the electrohydraulic servovalve is connected to the movable core in each of the LVDTs so that as the spool valve moves, each of the LVDTs develops a position output signal representative of the position of the spool. The connecting mechanism between the driven spool valve and the LVDT cores is a rod which is attached to the spool and includes a pair of flanges at the opposite end defining a groove therebetween. A pair of plates spaced apart at the center define a slot centrally thereof. The plates at the slot are spaced apart so that the width of the two plates plus the space between them is greater than the width of the groove in the rod. The outermost flange is formed so that it will fit through the slot in the plates. The two cores of the LVDTs include rods which are in turn permanently affixed at each end of the plates. In assembly, the plates are fitted over the end of the rod attached to the spool vavle and the centers are compressed slightly and the entire assembly is turned 90 DEG to lock the plates in position in a zero backlash configuration. The LVDTs are then assembled in place with the cores thereof inserted into the coils and the housing is attached to the body of the electrohydraulic servovalve.