耕うん機切込刃の形状に関する理論的研究　Ｉ　　切込角一定の刃の形状の解析表示について

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タイトル別名
  • Some theoretical research on the Cut-in blade of power tiller
  • コウウンキ キリコミバ ノ ケイジョウ ニ カンスル リロンテキ ケンキュウ
  • (1) 切込角一定の刃の形状の解析表示について

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抄録

1. An analytical difference between Pierce-in tine (so called Common tine) and Cut-in blade (nataba blade) was expressed by the equation (1).<br>2. The blade curve was analyzed through the equation (6) considering the cut-in angle γ is const. (Fig. 1). Some calculated examples were shown in Fig. 5.<br>For special cases, when the speed of rotary shaft u becomes zero, the equation (6) expresses the logarithmic spiral.<br>3. In case of u≠0 the tangential angle a can be expressed by the equation (7). (cf. Fig. 2)<br>4. The cut-in angle δ in operation will be the function of rotary angle θ, and it can be determined from the equation (10). (cf. Fig. 3)<br>5. As the Side blade has characteristics of Pierce-in tine, the transition part from Cut-in blade to Side blade will be obtained from the equation (9), in which γ=0. This shows the circle in which the center is located at (0, u/ω).<br>The patent dealing with the transition part (Kubota Co. etc.) can be considered as the special case of equation (9), where u=0. This is a circle of which the center is at (0, 0).<br>6. The section of Side blade consists of cylindrical surface, cut by any plane pararell to x-y plane, can also be expressed by equation (9).<br>The cut-in angle of the section under operation can be represented by the eqution (10).<br>For example, δ is around from -0°. 11 to -4°. -04, the negative sign means that the section has pierce-in effect.

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