Patent ID: 7594490

Claim:
An engine starter comprising a compact electric motor which is driven by a battery, a power accumulating unit which transmits a power of the compact electric motor through a high-speed reduction gear mechanism in a direction of accumulating power, and a power transmission unit which transmits an accumulated power of the power accumulating unit to a crank shaft of an engine, wherein the battery is arranged outside the engine starter, the power accumulating unit has a spring and a rotation supporting member for supporting one end of the spring, the rotation supporting member having a first gear on its outer peripheral surface, a second gear is fixed to an output shaft of the high-speed reduction gear mechanism, the first and the second gears are engaged with each other, the power accumulating unit, the power transmission unit, and the crank shaft are arranged on the same first axis line and the compact electric motor and the high-speed reduction gear mechanism are arranged on the same second axis line parallel to the first axis line, the second axis line where the compact electric motor is placed is arranged on a straight line, below the first axis line, connecting a center of gravity of the whole engine including peripheral units around a muffler and a carburetor, with the engine starter mounted thereon, and an axis line of the crank shaft, and the center of gravity rests in a plane defined by the first and second axis lines, and the starter is thereby configured to be mounted to the engine so that a center of gravity for the engine and starter in combination is placed within the plane.