What are the differences between cone crusher and jaw crusher main shafts?

During the crushing process, the main shaft is subjected to different types and intensities of force, which directly influences its material selection and lifespan:

- Jaw crusher eccentric shaft: Primarily subjected to periodic reciprocating impact loads. With each reciprocating motion of the movable jaw, the eccentric shaft experiences "instantaneous impact forces" generated by material compression, but the impact frequency is low, and the force is primarily in the transverse (horizontal) direction. Therefore, its material emphasizes "impact toughness," and alloy steel 42CrMo is often used.

- Cone crusher main shaft: Primarily subjected to continuous alternating combined radial and axial loads. When the crushing cone rotates eccentrically, the main shaft not only bears radial forces generated by material compression, but also axial pressure from the head assembly and the weight of the material. Furthermore, the rotation frequency is high, resulting in "high-frequency alternating heavy loads." Therefore, the material emphasizes "high strength and fatigue resistance," often using high-strength alloy structural steel such as 45# steel. Through-hardening and tempering treatments enhance surface hardness and core toughness.