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