POWER TRANSMISSION SHAFT AND ITS MANUFACTURING METHOD

Title:

POWER TRANSMISSION SHAFT AND ITS MANUFACTURING METHOD

Document Type and Number:

Japanese Patent JP2007239880

Kind Code:

A

Abstract:

To provide a power transmission shaft capable of obtaining high compression residual stress upon quenching and improving fatigue strength, and its manufacturing method.

The power transmission shaft includes a surface-hardened layer 4. Particles are mixed in a coolant for high frequency hardening, and this admixture is sprayed onto carbon steel containing 0.30 to 0.48 wt.% of carbon. The surface-hardened layer 4 is thereby produced. The residual stress of the surface-hardened layer 4 is set to -800 MPa or less.

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Inventors:

MORIMOTO HIROO

Application Number:

JP2006062894A

Publication Date:

September 20, 2007

Filing Date:

March 08, 2006

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD

International Classes:

F16C3/02; B24C1/10; B24C11/00; C21D1/10; C21D7/06; C21D9/28; C22C38/00; C22C38/04

Attorney, Agent or Firm:

Shogo Ehara
Hideka Tanaka
Yoshiyuki Shiraishi
Kunihiko Shiromura
Tsuyoshi Kumano
Hiroaki Yamane

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