Toyota Jidosha Kabushiki Kaisha

Hideyuki Sakaue

Masahiko Mitsubayashi

Keisuke Kadota

Hiroyoshi Tawa

Koji Inagaki

Takuya Shimizu

The problem of the present invention involves providing a gear that has high tooth-root bending strength and for which there is no chipping of the tips of the teeth. Accordingly, the surface of the gear is carburized and the gear is strengthened by imparting residual stress, with the residual stress in the region with a surface depth of 5 &#x3bc;m to 20 &#x3bc;m being &#x2212;1000 MPa or less, and the residual stress in the region with a surface depth of 50 &#x3bc;m to 150 &#x3bc;m being &#x2212;1000 MPa or greater.

Method of manufacturing a gear

To provide a method of manufacturing a carburized part contributable to cost reduction, a portion intended for a non-carburizing portion is treated to a surface roughness corresponding to Rz 50 like a first work surface and a portion intended for a carburizing portion is treated to a surface roughness corresponding to Rz 1.5 like a second work surface.

Growing community of inventors

Aichi-gun, Japan

Hideyuki Sakaue