巻号一覧
20 巻, 1 号
選択された号の論文の13件中1～13を表示しています
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1958 年 20 巻 1 号 p. 1-3,12
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (818K) -
耕耘爪の水負荷による振動西村 功, 竹内 竜三1958 年 20 巻 1 号 p. 4-6
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーIn this report of measuring the vibration of rotary power tiller, we used the constant-leveled water as the load of rotary tillage implements and produced the new type implements under the idea of necessary power to rotate it being easy to evaluate. As the results it became clear that the popular tillage implements had been produced also to be vibration-free as much as possible.抄録全体を表示PDF形式でダウンロード (514K) -
中馬 豊1958 年 20 巻 1 号 p. 7-12
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーThe effect of the moving conditions of the aircooled 2 cycle gasoline and the water-cooled 4 cycle diesel engine upon the smoke density of exhaust gas was investigated, and the following results were obtained.
(1) The smoke density of exhaust gas reaches the maximum soon after started, thereafter decreases suddenly and then very slowly.
(2) In the diesel engine the smoke density increases with the increment of r. p. m., while the 2 cycle engine reduces beyond the certain limit of r. p. m., The density is higher at the loads of 1/4 and 4/4, and lower at the intermediate loads of 2/4 and 3/4.
(3) The smoke density increases with the increment of the ratio of mobile oil to gasoline of the 2 cycle and the ratio of heavy oil to light oil of the diesel, but the variation of the density of the diesel is too slight to be measured with the eye.
(4) So far as the 2 cycle engine is concerned, the longer the idling period is, the more the smoke density increases within the certain limit of time.
(5) The smoke density increases in proportion to the increment of the diameter of leakage hole, and in this case the degree of increasing of the density of the 2 cycle is higher than that of the diesel.
(6) A spark plug with high heat value results in the higher smoke density at the lighter load, and on the contrary, a plug with low heat value at the heavier load.
(7) Imperfect atomization of the fuel injected form the nozzle causes the higher smoke density.
(8) The conditions of the piston ring affect the smoke density. The penetration of oil into the combustion chamber and the imperfect combustion due to the gas leakage are considered to be main causes of the higher smoke density.抄録全体を表示PDF形式でダウンロード (1003K) -
高速単軸圧縮試験川村 登, 梅田 重夫1958 年 20 巻 1 号 p. 13-16
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーAlthough the farm equipments such as the tillage tools and the tractor wheels act dynamic force upon the soils, the dynamic resistances of soils have not been tested and have been merely analogized with the static test data. For the purpose to know the speed effects on the fractures of the soils, the uni-axial high speed compression tests, varying the compression speed 0.1-300cm/sec, are done by the authors. The stresses and straines are recorded with the strain-gauge and oscillograph (Fig. 1).
The test results are as follows: (1) The slopes of stress-strain curves increase with the increasing speed, but more than a constant speed decrease. The higher the speed, the greater strain occures at which the soil fractures (Fig. 2). (2) At high speed the fracture phenomenon of the soils are due to the shearing same to the static tests (Fig. 3). (3) The fracture stress σ increases with log δ to a certain speed, and more than this speed σ decreases. (Fig. 4) These phenomenon are caused upon that the non-linear σ-ε relation gives the varying strain wave propagation speed c and yields the critical velocity at which the plastic modulus dσ/dε and c reach to zero and leads to rapid fracture by the localized strain.
These test results may offer the optimum speed of tool to give the least resistance, and to give the greatest traction and support of the tractor wheel.抄録全体を表示PDF形式でダウンロード (2621K) -
田中 孝1958 年 20 巻 1 号 p. 17-20
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーThe rolling resistance of the tractor wheel are researched by the soil deformation and the equili-brium of the force in this paper.
In Table 1, all cases of the force equilibrium on the equation (1) are shown, and the letters in it are
Rn: Normal component of the soil reaction force to the wheel. Rt: Tangential component. P: Drawing force. G: Wheel weight.
θ: Angle between the radius to the wheel center from the soil reaction point and the radius perpendicular to the plane which the wheel are driven.
Rt>0: Possitive to advance.
Rt<0: Negative to advance, for instance, by the brake, bearing friction, etc..
P>0: The case of the wheel drawn by the other force P.
P<0: The case which wheel are drawing.
Strictly, the rolling resistances of the powered wheel are different from them of the non-powered wheel. It is recognized by the soil deformation. They are shown by the equation (4) and (5).
(4) gives the resistance of the unpowered wheel, and (5) gives of the powered wheel. On ascent slope and down slope, they are given by the equation (8) and (9). α is the slope angle.
The maximum point of the rolling resistance on the powered wheel is caused when θ=π/4, and that magnitude is G/2, whine on the non-powered wheel, it is caused when θ=π/2. At the large velocity, as the wheel surface conflicts with the obstacle on the hard soil, the rolling resistance increases.
From above reason, in V, the results between the rolling resistance and the condition of the soil, the material, the width, the pneumatic pressure, the shape of lug or tread and the size of wheel, etc. are conducted.抄録全体を表示PDF形式でダウンロード (693K) -
1958 年 20 巻 1 号 p. 20
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (186K) -
石橋 貞人1958 年 20 巻 1 号 p. 21-24
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーThe traction resistance of the single wheel rolling on soil was measured under various conditions. The results obtained are summerized as follows: (1) The resistance and the weight of wheel stand in logarithmic linear relationship.
(2) Within the plastic range of soil, the wheel oflarger width decreases the resistance as much.
(3) The minimum resistance is observed near the plastic limit. (4) The reaction of soils to the applied pressure and the adhesion of soils seems to play an important rôle in the traction resistance.抄録全体を表示PDF形式でダウンロード (609K) -
重量の空気入ゴム車輪の牽引性能に及ぼす影響松居 勝広1958 年 20 巻 1 号 p. 25-28
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーEffects of the static vertical loading on the 4.00-8 pneumatic tire attached tiller type garden tractor on the performance of tire were tested on the hard grass land, hard road, dry soil, wet soil and pulverized soil. The results were as follows,
(1) Increasing the loading on the tire, increased the draft.
(2) On the hard grass land and hard road, the tractive efficiencies were equal at all loads on tire.
(3) On the dry clay loam soil, the tractive efficiency decreased by adding the loads on the tire.
(4) On the wet clay loam soil and pulverlized soil, the tractive efficiecy increased by adding the loads on the tire.
(5) The slip of the tire was 15-20% at most tractive efficieney.抄録全体を表示PDF形式でダウンロード (696K) -
ミストプロワー用各種ノズルの特性比較実験 (II)石原 〓1958 年 20 巻 1 号 p. 29-32
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーTwo nozzles for used of mist sprayer have been studied, in this paper the author has been investigated to an impact propeller type and an impact plate type nozzle on the experimentally especially, regarding the characteristics of its atomization, arriving force, dispersion, distribution. The experiment has been carried out under the same condition as V. reports. and as result the following have been obtained: -
For an impact propeller type nozzle, the drops which was atomized was effected largely by the propeller shape, blade and air velocity. And its distribusion showed a diffusing form. To an impact plate type nozzle, a drops size was changed by the mutual relation of plate size and nozzle diameter. That is a peculiality of this nozzle structure, and its distribution showed both diffusing and large arriving form by the selection of its impact plate and nozzle size. Active energy in this drops was large, and so its arriving force was powerful.抄録全体を表示PDF形式でダウンロード (6098K) -
刈刃の負荷特性に関する研究 (第1～2報)―E・O・4型切断試験機とV字型固定刃の挾角による切断特性江崎 春雄, 奥井 和致, 後藤 敏夫1958 年 20 巻 1 号 p. 33-36
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーNew Cutting Tester
1. We produced a new cutting tester-that is E·O-4 type Cutting tester, in 1955. (Fig. 1-2)
2. We have finished series of cutting tests by the group of rice, wheat and barley stems using the reciprocating cutters, rotary cutters and V-type knives.
3. In the field, the cutter bar travels forward and cuts crops, but in our cutting tester, the cutter bar is fixed and the groups of stems travel forward, on the contrary.
4. In our cutting tester, torque pick up and draft pick up of strain gauge are equipped.
5. By a crop grip frame, we can get some density of crops just as we please.
Charactaristics of V-type Knives.
1. We have done cutting test for V-type knives equipped in hand operated harvesting tool, on E-O-4 type cutting tester by cutting rice crops. (Fig. 3)
2. When the cutting width is narrow, the wider a included angle (α), the larger the cutting resistance.
3. When the cutting width is wide, the included angle have the ideal angle, that give the smallest cutting resistance. (Fig. 4)抄録全体を表示PDF形式でダウンロード (2466K) -
庄司 英信1958 年 20 巻 1 号 p. 37-40
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーAuthor studied on the functions of six feed rolls (A)-(F) of the rice holler in fig. 1, by means of high-speed kinematography taking about 1600 photographs per second in max. H and L in the table and figures mean high and low revolution of rolls respectively.
Fig. 1 shows the relation between peripheral velocities of rolls and flowing-down velocities of paddy. In fig. 3 are expressed the distribution-per centages of paddy-mass flowing at 4 sections of 2I/2″ width and in fig. 4 the fluctuations of their discharge. From the percentages in the table it can be seen to flow down any directions of paddy.
Generally speaking, the functions of rag rolls (A), (B), (C) are on the whole satisfactory, but the roll with non-many rag supported at two sides is assumed to be better. (D) roll is not adapted for a feed roll paddy in rice-huller, because it is difficult to give the equality of feeding out mass and the direction of longitudinal axis of paddy. Roll with deep flute is fitted to the external force feed of seeds.抄録全体を表示PDF形式でダウンロード (2574K) -
風力調節方法並に2次的曲面羽根の影響について常松 栄, 南部 悟1958 年 20 巻 1 号 p. 41-44
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーThe purpose of this study was to investigate fundamentally the effects of curved blade shapes, and their unloading characteristics. Three curved blade shapes (Fig. 1), which could be designed for use in this winnowing fan, were selected. The radial and backward slant blades were selected in addition to the forward curved blades in order that three basic shapes could be studied. The results were as follows:
1. In each opening of the air suction port, the backward slant blades required the least power and the forward curved blades the most.
2. The overall efficiency of the forward curved blades is better than the others, because they required less power to obtain the same wind velocity. The highest efficiency may be obtained at the opening No. 3.
3. The vertical distribution of wind velocity is lower at upside than down side of the delivery port. The horizontal distribution of wind velocity is similar to the U type. The rate of wind velocity deviation is about 5% of the four blades fan at the opening No. 2.
4. The forward curved blades, cut both end obliquely, have equalized the horizontal distribution of wind velocity.抄録全体を表示PDF形式でダウンロード (692K) -
大島 健夫1958 年 20 巻 1 号 p. 45-46
発行日: 1958/06/30
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (4313K)
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