COIL SPRING

PROBLEM TO BE SOLVED: To control a lateral force generated at a coil spring when the coil spring is compressed to a reference height.SOLUTION: A coil spring 50 has an effective winding part 54, a first seat winding part 56, and a second seat winding part 58. A first clearance 60 is formed at one end of the effective winding part 54 in a state of a free length H, the coil spring firmly adheres to a strand 52 of the first seat winding part 56 at a first portion of the strand 52 of the effective winding part 54 in a state that the coil spring 50 is compressed to the reference height, a second clearance 62 is formed at the other end of the effective winding part 54 in a state of the free length H, the coil spring firmly adheres to the strand 52 of the second seat winding part 58 at a second portion of the strand 52 of the effective winding part 54 in a state that the coil spring 50 is compressed to the reference height, and the first clearance 60 and the second clearance 62 are adjusted so that a lateral force which is generated at the coil spring 50 when the coil spring is compressed to the reference height becomes smaller than a maximum value of a lateral force which is generated at the coil spring 50 when the coil spring 50 is compressed to the reference height from the free length H.SELECTED DRAWING: Figure 2 【課題】 基準高さに圧縮したときにコイルばねに発生する横力を制御することができる。【解決手段】 コイルばね５０は、有効巻部５４と、第１座巻部５６と、第２座巻部５８と、を有している。有効巻部５４の一端においては、自由長Ｈ０の状態で第１隙間６０が設けられており、当該コイルばねが基準高さに圧縮された状態では有効巻部５４の素線５２の第１部分で第１座巻部５６の素線５２に密着し、有効巻部５４の他端においては、自由長Ｈ０の状態で第２隙間６２が設けられており、当該コイルばね５０が基準高さに圧縮された状態では有効巻部５４の素線５２の第２部分で第２座巻部５８の素線５２に密着し、コイルばね５０を自由長Ｈ０から基準高さまで圧縮したときに当該コイルばね５０に発生する横力の最大値よりも、基準高さに圧縮されたときに当該コイルばねに発生する横力が小さくなるように、第１隙間６０と第２隙間６２が調整されている。【選択図】図２