{TAIL ~ A ring gear} of a planetary reduction gear is screwed into an inner peripheral surface of {HEAD ~ a first housing} through an opening thereof, while the thrust receiving flange of a screw feed mechanism is held by the locknut screwed into an inner peripheral surface of a second housing through an opening thereof 
{ TAIL ~ A ring gear } of a planetary reduction gear is screwed into an inner peripheral surface of { HEAD ~ a first housing } through an opening thereof , while the thrust receiving flange of a screw feed mechanism is held by the locknut screwed into an inner peripheral surface of a second housing through an opening thereof
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH