翻訳をお願いします・・・翻訳ソフトだと読めません・・・
翻訳をお願いします・・・翻訳ソフトだと読めません・・・
By changing the mean diameter, the wire diameter, and the number of coils, any number of springs may be obtained to support a given load with a given deflection. However, there are certain limitations imposed by the use to which the spring is to be put. The usual procedure is to assume a mean diameter and a safe working stress, after which the wire diameter is found by substitution in the proper stress equation. The number of effective coils is the found from the deflection equation. Several trials are usually required before a suitable combination is obtained. The stress factor K depends on the spring index that must be assumed in the first trial solution for the wire diameter. For general industrial uses the spring index should be 8 to 10; for valve and clutch springs 5 is common; and 3 is a minimum value to be used only in extreme cases. Because of slight variations in the modulus of elasticity, variations in wire diameter, and other manufacturing tolerances, the deflection equations do not give extremely accurate values, and if extreme accuracy is required, the manufacturer should be consulted.
Compression springs should not be compressed solid when subjected to the maximum load. A clearance between the effective coils should be provided so as to prevent wear, or to prevent a foreign substance lodging between the coils and causing a fatigue crack failure. The free length is the solid length, plus the clearance, plus the maximum deflection. The solid length depends upon the number of effective coils and the type of the end provided. Different types of ends are illustrated in Fig.3.3. Note that the effective number of coils n may be less than the actual number in the spring. A helical compression spring that is too long compared to its mean diameter may buckle at comparatively low axial loads since such a spring is a very flexible column.
お礼
大変参考になりました。一般の方とは思えないほど、知識が深いのに感心します。ありがとうございました。