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A wave coil spring includes: a spring main body which has a spiral structure of a wave-shaped spring material, the spring main body bearing an axial compressive load in such a state that surfaces of the spring main body which face each other are brought into contact with each other at a plurality of

A wave coil spring includes: a spring main body which has a spiral structure of a wave-shaped spring material, the spring main body bearing an axial compressive load in such a state that surfaces of the spring main body which face each other are brought into contact with each other at a plurality of contact portions, the plurality of contact portions including: a first contact portion where a component of force is produced with application of the compressive load, which attempts to cause the spring main body to slide in a direction in which the coil main body is wound spirally; and a second contact portion where a component of force is produced with application of the compressive load, which attempts to cause the spring main body to slide in a direction in which the spring main body is unwound spirally.

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What is claimed is: 1. A wave coil spring comprising: a spring main body which comprises a spiral structure of a wave-shaped spring material, the spring main body bearing an axial compressive load in such a state that surfaces of the spring main body which face each other are brought into contact w

What is claimed is: 1. A wave coil spring comprising: a spring main body which comprises a spiral structure of a wave-shaped spring material, the spring main body bearing an axial compressive load in such a state that surfaces of the spring main body which face each other are brought into contact with each other at a plurality of contact portions, the plurality of contact portions including: a first contact portion formed on a slope of the wave-shaped spring material so as to generate a component of force in accordance with application of the compressive load, the component of force attempting to cause the spring main body to slide in a direction in which the spring main body is wound spirally; and a second contact portion formed on a slope of the wave-shaped spring material so as to generate a component of force in accordance with application of the compressive load, the component of force attempting to cause the spring main body to slide in a direction in which the spring main body is unwound spirally. 2. The wave coil spring according to claim 1, wherein the first contact portion comprises a portion where an arbitrary valley portion formed on an n+1th coil (n is a natural number) of the spring main body is brought into contact with one of slopes of an arbitrary peak portion formed on an nth coil of the spring main body, and wherein the second contact portion comprises a portion where an arbitrary valley portion formed on the n+1th coil of the spring main body is brought into contact with the other slope of the arbitrary peak portion formed on the nth coil of the spring main body. 3. The wave coil spring according to claim 1, wherein the spring main body is set such that wave-like pitches thereof comprise long pitches and short pitches which occur alternately and furthermore that a peak portion set on a short pitch is caused to face a valley portion set on a long pitch, while a peak portion set on a long pitch is caused to face a valley portion set on a short pitch. 4. The wave coil spring according to claim 1, wherein each of the first contact portion and the second contact portion comprise a gradient which allows an angle θ formed by a normal of the relevant contact portion relative to a compressive load applied to the spring main body to satisfy the following expression: tan θ>μ, where μ denotes a static friction coefficient of the spring main body. 5. The wave coil spring according to claim 1, wherein the first contact portion comprises a plurality of first contact portions and the second contact portion comprises a plurality of second contact portions. 6. The wave coil spring according to claim 1, wherein the first contact portion is formed on a slope prior to, in reference to a clockwise direction of the spring main body following the spiral structure of the wave-shaped spring material, a peak portion formed on the spring main body closest to the first contact portion and the second contact portion is formed on a slope after, in reference to the clockwise direction of the spring main body following the spiral structure of the wave-shaped spring material, a peak portion formed on the spring main body closest to the second contact portion. 7. The wave coil spring according to claim 5, wherein the plurality of contact portions comprise alternating first contact portions and second contact portions. 8. The wave coil spring according to claim 2, wherein a valley is formed in the arbitrary peak portion formed on an nth coil of the spring main body, and wherein the arbitrary valley portion formed on an n+1th coil (n is a natural number) of the spring main body contacts the arbitrary peak portion formed on the nth coil of the spring main body at a portion of the valley formed in the arbitrary peak portion formed on an nth coil of the spring main body.