[ Papers ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 30, No. 3, pp.174-180

ISSN: 2508-5107 (Online)

Print publication date 15 Jun 2021

Received 04 Mar 2021 Revised 15 Mar 2021 Accepted 18 Mar 2021

DOI: https://doi.org/10.7735/ksmte.2021.30.3.174

캠 랙 피니언 시스템의 강도설계

권순만^a^{, *} ; 차영빈^b

Strength Design of Cam Rack Pinion System

Soon-man Kwon^a^{, *} ; Young-Bin Cha^b

aSchool of Mechanical Engineering, Changwon National University
bDepartment of Mechanical Design & Manufacturing Engineering, Graduate School, Changwon National University

Correspondence to: ^*Tel.: +82-55-213-3629 E-mail address: smkwon@changwon.ac.kr (Soon-man Kwon).

Abstract

The cam rack pinion (CRP) system takes the traditional rack and pinion concept and advances it by replacing the pinion teeth with bearing supported rollers that engage a trochoid rack tooth profile. The bearing supported rollers eliminate the sliding friction of the conventional rack and pinion with smooth rolling friction that yields a 99% efficient rotary to the linear motion conversion. In this study, the fatigue failure life of a CRP system was investigated. First, we investigated the difference in rack tooth profiles by changing the profile shift coefficient of CRP systems. Next, the Hertz contact stresses and tooth root bending stresses were analyzed by varying the profile shift coefficient to determine the tooth fatigue characteristics. It was found that the variation in the contact force with increasing the profile shift coefficient was insignificant, but the Hertz contact and tooth root bending stresses decreased significantly.

Keywords:

CRP (cam rack pinion) system, Roller pinion, Profile shift coefficient, Hertz contact stress, TRBS (tooth root bending stress)

Acknowledgments

이 논문은 2021-2022년도 창원대학교 자율연구과제 연구비 지원으로 수행된 연구결과임.

References

Kim, C. H., 2014, A Study on Rack-Pinion System using Roller Gear Mechanism, Doctoral Dissertation, Changwon National University, Republic of Korea.
Terada, H., Makino, H., Imase, K., 1997, Fundamental Analysis of Linear Type Trochoid Gear (1st report), J. Japan Soc. Precis. Eng., 63:11 1609-1613 [https://doi.org/10.2493/jjspe.63.1609]
Kim, C., Nam, H., Kwon, S., 2012, Pitting Life of CRP System, J. Korean Soc. Manuf. Technol. Eng., 21:2 283-289 [https://doi.org/10.7735/ksmte.2012.21.2.283]
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ISO, 2006, Calculation of Load Capacity Spur and Helical Gears – Calculation of Tooth Bending Strength, ISO 6336 – 3:2006, International Organization for Standardization, Geneva.
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Soon-man Kwon

Full Professor in the School of Mechanical Engineering, Changwon National University.His research interests are pin gearing and speed reducer.

E-mail: smkwon@changwon.ac.kr

Young-Bin Cha

Graduate Student in the Department of Mechanical Design and Manufacturing Engineering, Changwon National University.His research interest is pin gear drive unit.

E-mail: qls1424@naver.com