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長屋, 幸助 ; 平田, 康夫 ; 鶴見, 豊明 ; 武田, 定彦 ; 永井, 健一 ; 谷藤, 克也
概要:
application/pdf<br />Journal Article<br />Stresses in elliptical-cross-section coil springs become small as compared to other springs used in practical machines at a certain aspect ratio. This article presents a simplified stress
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expression for designing the elliptical-cross section coil springs. The stresses obtained by the present design formula are compared with those obtained by numerical methods. It is ascertained that the present formula is applicable to design the elliptical-cross section-coil springs.
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| 2.
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長屋, 幸助
概要:
application/pdf<br />Journal Article<br />An analytical method and a result for obtaining dynamic stresses in the valve-spring of a driven valve system of internal combustion engines are presented with a consideration of the end
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effects. To treat the complex dynamic behavior due to cam rotation with complex profile, this paper applies a combination method of the transfer matrix, the Laplace transform and the Fourier series expansion procedures. Numerical calculations have been carried out for a sample case of general valve-springs, and the numerical results for the dynamic stresses have been obtained in the case of a spring excited by the driven valve system.
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長屋, 幸助 ; 新山, 文彦
概要:
application/pdf<br />Journal Article<br />This paper is concerned with a method for solving the stress problems of a viscoelastic solid of arbitrary shape with a circular cavity subjected to a vibration pressure along the cavity. In the
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analysis the exact solutions which satisfy the boundary conditions along the cavity have been derived from the equations of motion of elastic solids based on the two dimensional theory of elasticity. The boundary conditions along the outer surface of arbitrary shape have been satisfied by means of the Fourier expansion collocation method. The analysis considers the viscoelasticity and uses the structural damping theory. As examples, stresses in the solids of circular, hexagonal, square, elliptical and truncated elliptical shapes have been calculated.
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長屋, 幸助 ; 中田, 貴隆 ; 武田, 定彦
概要:
application/pdf<br />Journal Article<br />This paper deals with a method for solving dynamic stress problems of a non-cylindrical viscoelastic coil spring subjected to base excitations. The analysis considers the effects of ends of the
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coil, and applies the three dimensional curved beam theory for obtaining the exact solution of the element of the coil. The resultant forces and the resultant moments in the vibrant coil are decided by means of the transfer matrix method for an arbitrary shape. Both the shear and the normal stresses are obtained by use of the curved beam theory as just mentioned. Numerical calculations have been carried out for two cases of a barrel spring and a hyperboloidal spring.
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長屋, 幸助
概要:
application/pdf<br />Journal Article<br />円筒コイルばねの素線が任意形状断面を有する場合の素線内応力を求める解析解を誘導した.解析では中心圧縮ばねを考え, まず真直棒のねじり, せん断, 曲げによる
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応力をフーリエ展開境界値平均法により求め, ついで曲がり帽の理論を適用して素線の曲がりの影響を導入した. 本結果はばね素線断面境界の座標値のみを数値計算の過程でデータとして導入するだけで, あらゆる断面形状のばね素線内の応力を求める一般式である.
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| 6.
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佐藤, 雅志 ; 長屋, 幸助 ; 武田, 定彦 ; 松本, 幸夫 ; 斎藤, 純幸 ; 森田, 国樹
概要:
application/pdf<br />Journal Article<br />第一報で与えた理論結果を用いて異形断面ばねの数値計算を行い, また実験をも行い,第1報の結果が実用上十分な精度を有することを確認した. 次に卵形断面ばねを新
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たに開発し, 理論値と実験値との比較検討を行うとともに, 従来の円形断面ばねとの比較も行い, 卵形ばねがより優れた機能部品となることを明らかにした. さらにだ円形断面ばねならびに丸コバ断面ばねの開発をも行い, 異形断面ばねの系統的設計法を確立した.
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