Power transmission shaft

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A hollow power transmission shaft with a low-hardness softened layer addresses delayed fracture issues, enabling effective straightening and reducing waste through improved manufacturing processes.

JP2025136938APending Publication Date: 2025-09-19NTN CORP

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Patent Information

Application Number: JP2024035878
Authority / Receiving Office: JP · JP
Patent Type: Applications
Current Assignee / Owner
Filing Date: 2024-03-08
Publication Date: 2025-09-19

Application Information

Patent Timeline

08 Mar 2024

Application

JP2024035878

19 Sep 2025

Publication

JP2025136938A

IPC: F16C3/02; C21D9/28; C21D9/08

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Application Domain

Shafts Furnace types

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AI Technical Summary

Technical Problem

Hollow power transmission shafts made of steel pipes are prone to delayed fracture due to stress concentration during straightening processes, and forming a decarburized layer to prevent this is difficult with high-frequency induction heating, especially when the surface layer is machined for finishing.

Method used

A hollow power transmission shaft with a surface-hardened layer having a cylindrical softened portion with a low hardness of HV 400 to 500 at a depth of 1.5 mm or less, which reduces susceptibility to delayed fracture and allows for effective straightening.

Benefits of technology

The shaft is less susceptible to delayed fracture and can be accurately straightened, reducing scrap and improving product yield.

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Abstract

To realize a hollow power transmission shaft 1 having low susceptibility to delayed fracture, and capable of appropriately carrying out bending correction.SOLUTION: A hollow power transmission shaft 1 has a steel pipe as a substrate. A large-diameter part 2 is provided in an axial center region and a small-diameter part 3 with a spline 5 is formed on both axial sides of the large-diameter part 2. The entire large-diameter part 2 is provided with a surface-hardened layer 7 formed by quenching. The hardened layer 7 has a cylindrical softened part 8 in which a low-hardness layer 7A is provided at a depth of 1.5 mm or less from the surface (outer diameter surface) with a Vickers hardness (HV) of 400 to 500.SELECTED DRAWING: Figure 2

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