STOPPING DEVICE FOR ROTATION OF SPARK-IGNITION TYPE INTERNAL-COMBUSTION ENGINE

摘要

PURPOSE:To improve the capacity of a stopping brake of an engine in a simple structure by providing a mechanism to give an ignition timing of a further lead angle than in usual operation for switching over between the ignition timings in the usual operation and the stoppage of revolution. CONSTITUTION:Two breakers 15 and 16 for usual operation and revolution stopping are connected to the primary coil 11 of an ignition circuit to be easily switched over, and respectively caught by two breaker cams 20 and 21 for usual operation and revolution stopping on a suction/exhaust valve opening and closing cam shaft (4-cycle) or a crank shaft (2-cycle) 19. A revolution stopping breaker cam 21 is shaped in its top for giving an ignition timing of a further lead angle than a usual operation breaker cam 20 by a fixed angle deltatheta at an ignition plug 13 so that a reverse revolutionary torque may be given to a crank shaft to stop an engine. This device is mainly used for a hand mower and the like. It is convenient for connecting and interlocking a changeover switch 17 with a throttle lever to be switched over automatically by the grasp of an operator.