Patent ID: 7849831

Claim:
A manual work machine mounting a start device for a small-sized engine, the manual work machine comprising: a small-sized electric motor which is driven by a battery, a buffer/power storage section to which output of the small-sized electric motor is drive-transmitted in a direction of force storage via a speed reduction mechanism, and a power transmitting section which transmits power stored in the rotating power storage section to a crankshaft of an engine, wherein: the small-sized electric motor and the speed reduction mechanism are arranged on a first axis line, the power transmitting section and the buffer/power storage section are arranged on a second axis line parallel to the first axis line, the first axis line is positioned vertically below and parallel to the second axis line, the first axis line defines a plane including both the first axis line and the second axis line, the work machine is balanced relative to a sideways direction when the plane surface is positioned parallel to a direction of gravity, the battery comprises at least one lithium secondary battery having a discharge capacity not less than 1000 mAh, the small-sized electric motor comprising a housing having a volume from 4.0×10 3 to 8.0×10 4 mm 3 , a stalling current from 1 to 100 A, and a stalling torque from 10 to 500 mNm, a reduction ratio of the speed reduction mechanism is in a range of 1/30 to 1/90, and a range of time required to start the engine from a start of the small-sized electric motor is in a range of 0.4 to 1.3 seconds.