Engine starter

An engine starter comprising

• a d.c. motor including a hollow armature rotary shaft having a plurality of cam surfaces composing an over-running clutch mechanism formed on an inner pheripheral surface thereof and having a reduced-diameter portion formed at one end on an outer circumference thereof within an axial length range in which no cam surfaces are provided and having at the other end a radially outwardly extending stopper, a sleeve member having a rolled portion on the outer circumference thereof press fit onto said reduced-diameter portion of said armature rotary shaft, and an armature core placed over the outer circumference of said armature rotary shaft and press fit over the outer circumferential surface of said sleeve member;
• a tubular inner member extending within the interior of said armature rotary shaft by at least an axial distance corresponding to the axial length of said cam surfaces;
• a roller and a biasing spring disposed within each of wedge-shaped spaces defined between an outer circumferential surface of said inner member and said cam surfaces;
• an output rotary shaft disposed within said inner member in a axially slidable engagement therewith by means of splines;
• and
• a solenoid switch assembly capable of supplying electric power to said d.c. motor and simultaneously axially sliding said output rotary shaft.