Patent ID: 6389914
Filing Date: 2002-05-21
Classification: F02N,Y10T

Abstract:
A one-axis starter motor apparatus having a tip end and a base end, comprising:a motor shaft having an axial portion between the tip and base ends; a helical spline portion at one of the tip and base ends; an inner member externally fitted to the motor shaft of the starter motor via a first helical spline on an inner periphery of the inner member and mated to the helical spline portion at the one of the tip and base ends so as to freely advance and retreat; an outer member having a helical spline portion on an inner periphery of the outer member, on which outer member a pinion gear disengageably engaged with a driven ring gear on the basis of the advancement and retreat of the inner member is formed, the outer member being externally fitted to an outer periphery of the inner member; and a pressing means, wherein the outer member is urged toward the driven ring gear side by the pressing means in a state where the outer member's movement relative to the driven ring gear side is regulated with respect to the inner member, and wherein the outer member is externally fitted to the inner member via a second helical spline provided on the outer periphery of the inner member and mated to the helical spline portion on the inner periphery of the outer member which are reversely oriented from the first helical spline.