農用作業機とエンジンのはずみ車関連効果に就て

抄録

1. On Flywheel Effect of Agricuftural Machineries. Experiments were conducted for the pur pose of investigating the extent of influence the flywheel effect had upon the working ability of the agricultural machinery with the use of an 8″ cutter equipped with an assembly type frywheel designed for variable moment of inertia. The following conclusions were obtained as the result of the above test.
(1) The cutting power requirement is very little affected by the change in the moment of inertia of the fly-wheel. It was further confirmed that the smaller the moment of inertia may be, the larger the maximum cutting capacity becomes. The reason for this can be considered that free running horsepower required increases as the moment of inertia gets larger, and also that added energy from engine is required to overcome slow-down of the cutter R. P. M. in proportion to the polonged cutting length.
(2) To speed up the fly-wheel R. P. M. of the cutter to obtain larger revolution energy is effective to raise elevating height, but it is not advisable due to exceedingly large free running horsepower in need as its R. P. M. is increased which is large enough to offset the aforementioned merit. A proper R. P. M. must be selected for the best result. In case of a power threshing machine, the R. P. M. of the threshing drum is determined from the standpoint of cleaning and sorting ability. But same thing applies to this machine as the cutter from the standpoint of working ability.
(3) Anyhow, the cutter fly-wheel, threshing machine, etc. which have hitherto been designed with consideration on the fly wheel effect, do not necessitate large moment of inertia (so far as required strength is provided) and also it is meaningless to increase the running speed to attain an revolutionary energy which is far larger than required.
2. On Flywheel Effect of Farm Engines. Experiments were conducted for the purpose of investigating the extent of influence the flywheel effect of the engine had upon the load performance of agricultural machinery under the same working conditions. The follwing conclusions were obtained as the result of the above test.
1) The load performance of the agricultural machinery is not affected by the change in the moment of inertia of engine fly-wheel.
2) The load performance of the agricultural machinery is not affected by engine R. P. M. increased to obtain larger revolution energy. On the other hand, added engine speed results in larger loss of power transmission which invites decreased performance ability and shortened life of engine, which will sufficiently offset the merit of increased revolutionary energy. Thus it will not be considered an economical way of using the machine.
3) These results can be easily analogized from the experimental report (1) in which we studied the relationship between the fly-wheel effect and the working ability of the agricultural machinery that has larger fly-wheel effect than that of engine.
4) Accordingly, the fly-wheel on agricultural engine should be designed with prime consideration on the starting performance.