The transmission efficiency

and the relationship between the amount of spring compression of safety jaw clutch and output torque of chain-grate gearbox are measured using the technique of mechanical closed power circuit. This kind of gearbox has low output speed; high transmission ratio and large transmission load. The measuring results provide the criteria for determining the power of motor and the amount of spring compression of safety jaw clutch. The measuring method is simple

and characterized by low investment

high measuring precision

and energy saving.