Transactions of the Korean Society of Machine Tool Engineers (한국공작기계학회논문집)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
권호 표지

Strength Estimation of Injection Molded Plastic Stepped Spur Gear

사출 성형 플라스틱 단붙이 기어의 강도평가

  • 정태형 (한양대학교 기계공학과) ;
  • 문창기 (한양대학교 대학원 기계설계학과) ;
  • 하영욱 (한양대학교 대학원 기계설계학과)
  • Published : 2006.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

The strength estimation is carried out for injection molded plastic stepped gear. The stepped gear is considered as a plate model which is fixed by two edges and freed on the other sides. The stress of common normal gear is calculated by Lewis formula which can be derived quite simply from the equation fur the stress at the root of a cantilever beam. Stress ratio(step factor) between the common normal gear and stepped gear is proposed for the ratio of the bending stress of normal gear and that of stepped gear. This study proposes the step factor added in Dupont equation which is used for strength estimation of injection molded plastic stepped gear.

Keywords

References

  1. Pye, R. G. W., 1989, Injection Mold Design, 4th ed, John Wiely & Sons, Inc., New York, pp. 3-254
  2. Dudley, D. W., 1984, Handbook of Practical Gear Design, McGraw-Hill Book Company, pp. 3.128-3.135
  3. Clifford E M. Dekker, 1980, Plastics gearing : selection and application, pp. 129-184
  4. Chong, T. H., Moon, C. K. and Ha, Y. W., 2004, 'Strength Estimation of Injection Molded Plastic Stepped Spur Gear,' Proceedings of 2004 Autumn Conference, KSMTE, pp. 92-97
  5. Polyplastic co., 1988, Plastic Gear, pp. 71
  6. Engineering Polymers, 2000, General Principles for DuPont Engineering Polymers
  7. Hachmann H., 1966, Konstruktion, pp. 11-14
  8. Rees D. W. A, The mechanics of solids and structures, McGraw-Hill