Importance

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Abstract

An injection molded shaft includes a shaft body having a first connecting part formed integrally with the first torque applied part, a second connecting part formed integrally with the second torque applied part, a core part extending from the first connecting part to the second connecting part along the longitudinal center axis, the core part having a crisscross cross section orthogonal to the axial direction, and a framework part disposed in a portion partitioned by the first connecting part, the second connecting part, and the core part. The framework part is a diagonal brace extending diagonally across the first connecting part, the second connecting part, and the core part. A through-hole extends through the first torque applied part along the longitudinal center axis from an axial end face of the first torque applied part to the first connecting part of the shaft body, and the first torque applied part, the second torque applied part, and the shaft body are integrally formed of a resin material to have a unitary one-piece construction.

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First Claim