These springs are called torsional springs. They let the middle part of the clutch disc turn slightly on the hub. Thus, the springs absorb the torsional vibrations of the crankshaft.
Using an industry standard Size 15 modular mounting pattern, the index mark on the dischub can be coarse aligned to the index sensor position on the housing.
使用业界标准尺寸15模块化安装模式，光盘上的枢纽指数标记可以粗对齐房屋价格指数上的传感器的位置。
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This paper presents s combined inlaid clutch dischub, its structural design and manufacturing process.