| 摘要 |
PURPOSE: A surface hardening method of a transmission gear is provided to increasing fatigue strength of the transmission gear by hardening surface of the gear using water jet pinning process. CONSTITUTION: A surface of a transmission gear is hardened by projecting pressurized water ranging 100 to 250MPa to the surface through an orifice using a water pinning device. In the water pinning device, a hydraulic system(100) is operated by a control unit(20) so as to spray pressurized water toward teeth of the gear through a spray nozzle(14). The spray nozzle is controlled to accurately spray the pressurized water from the hydraulic system to the teeth of the gear while being moved by a carrier(16). The sprayed water is gathered by water tank(10) and then filtered by a filter(32), thereby being turned to a storing tank(18).
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