The Study on the Shape and Action of Japanese Vertical Screw Plow Tooth

Abstract

The locus calculating equations of the tooth of each order on each plural teeth of Japanese vertical screw type plow with plural teeth type were obtained in turn, from which a general equation was derived.
The calculating or approximating formulas of horizontal cutting area, side uncutting area of plural teeth type and cutting volume per rotation of a tooth were obtained, and shape of cutting volume was investigated.
Still more the calculating formula of pan uncutting volume was given and it was shown that the volume can be ignored by its real value calculation.
Subsequently, the shape elements (form elements and actional elements) of screw tooth were analysed and defined, and were measured on the elements of manufactured goods, on which theoretical discussion of the shape and action was added.
The results were as follows: the similar points or differences between the screw tooth, rotary hoe blade and plow body, and also the characteristics of screw tooth were made clearer. Problems left for further improvements were pointed out as well.