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.

抄録全体を表示

This experiment was performed with the similar methods reported in the paper No. 3 and 4.
In this test, the wheel had one lug that was put on with 4 different angle was used, and it was advanced by the pulling force and the torque force, Then, one test of them was the unpowered rolling, and the other was the powered advance.
Then the deformations of the soil by each wheel were photographed. From that results, it was found that the moving of the soil, the appearances of the sliding shear planes and the directions of the principal stress were not effected by the angle of lug, but they were varied by the locuses of thier lug planes in the soil.

抄録全体を表示

In this paper, the results of the deformation of the soil by the rolling of farm wheel are reported. These wheels have the lug attached with various angle. The photographs in the paper are the few examples of these tests. The soil moving. are effected by the locus of the lug, and the soil moves to the direction of the lug locus. The table shows the details of the test, and in upper part of it, the details of the test of wheels that have the lug attached to the wheel surface and under part of it, the details of the test of wheels that have the lug only are shown.
From upper line of it, Test No., Photograph No., lug angle, the number of lug, the slip percentage at the wheel surface, the slip percentage at the top point of lug, the left letters of next line is written “drawn wheels”, the right is “wheels that draws the load”, last line is the load drawn.

抄録全体を表示

This study was undertaken to investigate the deposit of dusting particles on crop leaves. It was carried out under several dusting conditions, combined with various jet-speeds and discharges from the Duster.
The test was carried out in a closed room, 10 metres by 24 metres in area, and 4 metres in height. The Duster was driven on a specially designed frame, rotating at 4π/15rad/sec in angular verocity. The jet flow of air containing the dusting powders was passed once over the fixed rice leaf surfaces. After dusting, the particles deposited on the leaves were examined for size, number and the area covered.
The results of the tests are as follows:
1) The wind velocity (distribution) of the jet coming from the blower was measured with a pitot tube type, birum type and trial thermister type anemometer. In the results, the wind velocity decreased in proportion to x^-1 where x is the distance from the jet nozzle, and its distribution is approximately represented by the equation (4).
2) In the tests in which the distance exceeded 3 metres, no difference in the deposit was in evidence. When the distance was under 3 metres, the area covered decreased rapidly, according to the distance. However as the jet speed became larger, this tendency lessened. If a uniform dusting is disired, then the jet speed mast be increased according to the distance.
3) When any area was sufficiently covered-in our estimation, about 5% for an effective deposit of dust particles; we established the following figures as limit point:
at a distance of 1 to 1.5 metres for a jet speed of 20-30m/s
at a distance of 1.5 to 2 meter for a jet speed of 40m/s
at a distance of 2 to 3 meters for a jet speed 50-00m/s.
The wind velocity at all these points was 3-10m/s. Moreover, these points correspond to the minimums deposit ratio of the (dusting) particles on the leaf surfaces.
Considering the decreasing velocity of the jet stream, together with the results mentioned above, the characteristic of the jet stream can be designated by two terms: “Effective Distance of the fet Stream” i.e. the distance closest to the nozzle of the Duster wherein a satisfactory deposit can be obtained; and the “Over Distance of the Jet Stream” i.e. the distance to the farther most point for an effective dusting.
For an effective dusting, the dusting should be done within the limits of these points to secure an effective deposit. Though the deposit ratio was under 20% using 1.0 for specific weight of dust, still the Duster must be aimed at the point of maximum deposit ratio.
In using the over Distance rating, since the adhereing or dusting quality is not changed considerably either by a change in jet speeds or in alteration of discharges of dust; and since the deposits are few in number, a greater dusting efficiency as well as an improvement in results can hardly be hoped for.
4) When the slower jet speed is used for dusting, the particles deposited are large in size. and few in number, but the area covered is wide. And as the distance increases, approaching the 3 metre limit, the jet speed becomes faster, the particles decrease in size and increase in number, the area covered becomes wider. However when an excessively fast jet speed is used for dusting, the number of particles becomes fewer and the covered area decreases; in contrast with the results obtained when a suitable jet speed is employed.
When there is danger of chemical poisoning or when the distance between the nozzle and the crops is great, a faster jet speed must be used, by raising the revolutions of the blower, in this way crushing the particles of dust into smaller sizes.
As the distance between the nozzle and the crops becomes shorter, a lower revolution may be used in the blower, i.e. a slower jet speed, of course with in the prescribed range so that the size of the dust particles does not become excessively large. Consequently a wider area can

抄録全体を表示

The author studied for equilibrium and measured the increase of draft force and handle reaction by various weight loading and hitching point of tiller type garden tractor. The results were obtained as follows:
1. The increase of handle reaction has almost same value at no-loading and wheel weight loading.
But handle reaction decreases when the balance weight is transfered to front.
2. On various loading, the max. draft force is in order of balance weight loading 120cm>″90cm>″60cm>wheel weight loading>no-loading for each hitching point.
As hitching point drops lower and nearer to driving shaft, max. draft force increases.
3. The Kinematic equilibrium formula that contains driving moment Mf, is established by means of the above results.
4. By wheel weigt loading, the center of gravity shift lower position and the increase of draft force has the same value as its weight.
By balance weight loading, the increase of draft force is more than its weight. As loading position of balance weight is transfered to front the max. draft force is increased, too.

抄録全体を表示

The properties of corrosion resistance of aluminium alloy systems, such as, aluminium alloys with copper, copper and silicon, silicon, silicon and magnesium, and magnesium and manganese, to some chemical manures were studied, respectively.
And, as the chemical manures, one percent solution of urea, ammoniwm sulphate, potassium nitrate and potassium phosphate dibasic were used, respectively. Thus, the relationships between the alloy compositions and the chemicals were clarified.

抄録全体を表示

In this paper authors investigated the distribution of threashed materials under the concave sieve of the over-feed system power threashing machine. The distribution of threashed materials was almost same to that of under-feed system, showing W-fiqure type at one-man operating and U-fiqure at two men operating, however, they appointed some differences between over-feeding and undeder feeding. Authors clarified the factor characterizing the distribution of over-feed system was derived from the formation of higher effect, illustrating the free distribution of the threashed materials of the pedal threashing machine, as a fundamental model of over-feed system.
In addition to that, they mentioned the custom of applying the over-feed system to the treatment of comparatively big bundle, with regard to the effect of the size of bundle on the distribution of grain.

抄録全体を表示

We tried to make small type corn harvester, as an attachment of small tractor (3-4HP).
Cutterbar is circular saw type that have fling out blade, and gathering attachment is belt type or spiral type.
This machine is suitable for small area corn field as a windrower, but can not harvest cleanlylodged corn.

抄録全体を表示