Direct drive valve ball drive mechanism and methodof manufacturing the same

摘要

A direct drive servo-valve wherein rotational motion of a drive motor rotor is converted into linear motion of a spool valve. The drive motor includes a shaft which has affixed to the end thereof a ball which engages the spool valve. The ball is affixed to the shaft by providing a bore internally of the shaft which is disposed eccentrically to the longitudinal axis of the shaft. The ball has a portion thereof ground of so as to provide an integral protrusion which is received within the bore in the end of the shaft. The ball is permanently affixed to the shaft by brazing the protrusion into the bore and a planar surface which surrounds the base of the protrusion to the end of the shaft against which it mates.