Bearing Strength of Tooth Surface of Conical Involute Gear

Research Project

Project/Area Number	09650155
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	設計工学・機械要素・トライボロジー
Research Institution	YAMAGATA UNIVERSITY
Principal Investigator	MITOME Ken-ichi YAMAGATA UNIV., Faculty of Engineering, Professor, 工学部, 教授 (90007013)
Co-Investigator(Kenkyū-buntansha)	OHMACHI Tatsuya YAMAGATA UNIV., Faculty of Engineering, Research Associate, 工学部, 助手 (80250679) UEMATSU Seizo YAMAGATA UNIV., Faculty of Engineering, Associate Professor, 工学部, 助教授 (30007009)
Project Period (FY)	1997 – 1998
Project Status	Completed (Fiscal Year 1998)
Budget Amount *help	¥4,000,000 (Direct Cost: ¥4,000,000) Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000) Fiscal Year 1997: ¥3,500,000 (Direct Cost: ¥3,500,000)
Keywords	Gear / Conical Involute Gear / Bearing Strength / Tooth Surface / Design / Fatigue Strength
Research Abstract	In the first year, the testing machine for bearing strength of tooth surface of conical gear is designed and developed. The power circulating method is taken into the testing machine. Test gears and master gears are put into the same gear box and the torque flange coupling is positioned at the end of the torsion shaft. From these characteristics, the compact machine is realized. In the next year, using this machine, the experiments of bearing strength are executed. The material of the test gear is SCM440(JIS standard), the hardness of the test gear is Hv=250-300. Test gear is normalized after hobbing and finished by grinding. Pitting damages are occurred on tooth surface of the test gear. When the area rate of pitting become 3 % of contact area till the number of times of contact to 10^7, the circhlating torque value at the experiment are decided to the maximum allowable load. In experiments, tooth surface of test gears are broken when the load is 157-177 [N.m].