GEAR EXCELLENT IN TOOTH SURFACE FATIGUE DAMAGE LIFE

Title:

GEAR EXCELLENT IN TOOTH SURFACE FATIGUE DAMAGE LIFE

Document Type and Number:

Japanese Patent JP2013204645

Kind Code:

A

Abstract:

To provide a gear excellent in tooth surface fatigue damage life to sufficiently meet recent required characteristics.

A gear has surface properties with concave shapes existing on a gear base surface, wherein a ratio (A2/A1) between a projecting crest part sectional area A1 (μm²) prescribed in JIS B 0671-2 and a projecting trough part sectional area A2 (μm²) is 3-11.0 and a mean value of the maximum trough depth Rv in a roughness curve prescribed in JIS B 0601 is not greater than 10.0 μm.