The authors measured the amplitudes of vibrations encountered in the horizontal single cylinder water cooled engnies, installed on the special designed bed, and compared with the inertia forces. The results may be summarized as follows; The longitudinal and vertical amplitudes are approximately proportional to the square of revolutions of the engine. The ratio of the longitudial and vertical amplitudes are very similar to the ratio of their inertia forces.
The internal force feed mechanism of seeds was analyzed experimentally, especially in respect to the sizes, operating angles, speeds and distances of its cell for five kinds of seeds. Some results that would be useful for practical improvement of seeders were obtained as follows. 1. The reasonable diameter of a cylindrical cell is a little larger the maximum length of seeds. 2. The reasonable depth of a cylindrical cell differs according to sizes and shapes of seeds and is determined by the thickness for such flat seeds as corn, by the width for such spindle-shaped or ellipsoidal seeds as barley, wheat or soybean, and by the length for such spherical seeds as rape. 3. The cell has to operate as slowly as possible and at the angle over 33-45 degrees to a vertical line. 4. The larger sizes of seeds are and the faster the cell operates, the longer the operating distance of the cell must be made. 5. In the roll type feed mechanism, the operating distance of the cell is generally so shortened that this mechanism is not suitable for such large seeds as corn and soybean.
We tried to make a down-the-row thinner which used for the tiller. It was a mounted 3-row machine (Fig. 1) employing land-wheel drive to rotate the three independent cutting heads. The rolling radius of the cutting head is 203/4 in. Those could be fitted with 8 or 16 L-shaped blades and an iron depth wheel (7 in. diameter) was clamped to each unit. The blade is 1 in. long which is shown in fig. 2. According to the design of this machine, the cutting (thinning) width is about 6 in. when the depth of the blade is 9/16 in. The gear ratio gave 40 in. of forward travel for each revolution of the cutting heads when there was no slip of the driving wheels. At the 16 blades, the length of row cut is 46% The diameter of driving shaft and cutting-shaft were 7/8 in. and 3/4 in respectively. In the case of wheel carrying and head running, it was no trouble when those shaft are used. An external force at the blade was about 3-4kg. The reaction by the turning effort of the tiller was almost negligible. The hitch of this machine is designed, so that it can be removed the external twisting and bending force.
The performance tests for Komatsu WD-45 wheel tractor were carried out on the test fields at “Hokudai” and “Tomikawa” areas. The top soil is loose and dry clayey loam at “Hokudai” and light volcanic loam at “Tomikawa”. The results are as follows. 1. Coefficient of adhesion at “Hokudai” 0.52 2. Practical maximum drawbar pull at “Hokudai” 1200kg 3. Max. tractive efficiency at “Hokudai” about 50% 4. Plowing efficiency, when pulling two-bottom 14″ integral-mounted moldboard plow at the depth of 20cm is 0.36ha/hr at “Hokudai” under 2nd gear operation, and 0.40-0.47ha/hr at “Tomikawa” under 4th gear operation. However, fuel consumptions are both about 2.2 its per 10a. 5. When pulling a single standard mole plow (mounted type, dia of mole ball is 3.5″), we obtained practical maximum penetration of 42cm on the top soil at “Tomikawa” under good conditions, but about 32cm on the loose top soil. It took 1 hour 7 minutes 35 seconds to penetrate along 710m under 1st gear operation, and fuel consumption was less than 8 1ts. 6. It is able to pull a four-gang pick up type 20″×24 disk harrow under 3rd gear operation (1.8-2.0m/sec) on the field plowed 20cm deep. Althongh efficiency is at variance with the methods of harrowing, it is able to cover 0.94-1.25ha/hr. for one round, and fuel consumption is 0.57-0.87 1ts. per 10a. 7. It is able to drive the rotary pulverizer (power-take-off-driven, 185cm wide, 48 tines attached) on loam plowed 20cm deep under 2nd gear operation. Efficiency is 0.683ha/hr. at a depth of 16cm, however it may be increased up to about 0.74ha/hr. when becoming skillful. In this fall, we will repeat the performence tests for Komatsu WD45 on heavy clayey soil.
In order to consider the effects of cultivator to the permeability of soil to air, we investigated the relation of air permeability to soil texture and structure, and obtained the following conclusions. (1) The air permeability depends upon the soil structure: it decreases with decreasing air capacity of the soil. (2) The presence of a thin compacted layer at the soil surface especially reduces permeation to air. (3) Therefore, arranging aggrigates or large clods upon the soil surface is desirable for the improvement of the air permeability. (4) The data in this investigation clearly shows the effect of cultivator to the improvement of the air permeability, but it is dangerous to apply these results directly tothe practical effects of cultivator, because it differs the kind of tine, the method of operation, the kind of crop and the time of growth.
There are three types of wheel cutter knives: concave, straight and convex. The strain distribution was measured, and from the experimental results it was found that the concave knife is the best form for the straw.
To find out the less expensive method for drying of red-clover, writer has carried out a ceries of investigations, by using a forced atmospheric air ventilation drier. The writer described about the operation of drier, the quality and the productive cost, and available region in Hokkaido.
Method of installing between the tiller type tractor and a Japanese plow have some mutual relation as following; 1. Formulae between depth of furrow (t) to running tractor wheel and working depth (y) are as follows (Fig. 1), t=acosα+b/ly; y=lsinα Working depth is max. when t=y, and always depth of the plow increases up to point of t=y. 2. Width of wheel tread and wheel type landside (Fig. 3) decrease in draft resistance of the plow. 3. Side draft caused by the increase of wheel tread, decreases with the increase of working depth, because the eccentricity of plow point from center of gravity of tractor decreases by the change of relative position of plow and tractor.
The wear properties of steels against a soil were studied by using normalized carbon steels having different amount of carbon. Hirose river sand having 24-48 meshes was used as a soil. In the case of the running velocity is constant, the effects of humidities of soil, cutting angles and cutting resistance upon the durability of wear of low carbon steels were clarified by a solid diagram. And the respective relationships between the humidities of soil, the amount of wear of metals and the amount of carbon content of steels were clarified systematically by ternary solid diagram.