[논문]Characteristic Analysis of Planetary Gear Set of Hydromechanical Transmission System of Agricultural Tractors

Park, Young-Jun; Kim, Jeong-Gil; Lee, Geun-Ho

doi:10.5307/jbe.2016.41.3.145

Characteristic Analysis of Planetary Gear Set of Hydromechanical Transmission System of Agricultural Tractors 원문보기

Journal of biosystems engineering : JBE, v.41 no.3, 2016년, pp.145 - 152

Park, Young-Jun (Department of System Reliability, Korea Institute of Machinery and Materials) , Kim, Jeong-Gil (Convergence Components & Agricultural Machinery Group, Korea Institute of Industrial Technology) , Lee, Geun-Ho (Department of System Reliability, Korea Institute of Machinery and Materials)

Abstract ▼ AI-Helper

Purpose: This study aims to establish the effect of pinhole position errors in the planet carrier of a planetary gear set (PGS) on load sharing among the planet gears in the hydromechanical transmission (HMT) system of an agricultural tractor. Methods: A simulation model of a PGS with five planet gears was developed to analyze load sharing among the planet gears. The simulation model was verified by comparing i ts r esults w ith those of a model developed in a previous s tudy. The verified simulation model was used to analyze the load-sharing characteristics of the planet gears with respect to the pinhole position error and the input torque to the PGS. Results: Both simulation models had identical load magnitude sequences for the five planet gears. However, the load magnitudes on the corresponding planet gears differed between the models because of the different stiffnesses of the PGS components and the input torques to the PGS. The verified simulation model demonstrated that the evenness of load sharing among the planet gears increases with decreasing pinhole position error and increasing input torque. Conclusions: The geometrical tolerance of the pinhole position should be properly considered during the design of the planet carrier to improve the service life of the PGS and load sharing among the planet gears.

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문제 정의

The present study aimed to analyze the effects of pinhole position errors in the planet carrier of the PGS of a HMT system in a tractor on load sharing among the planet gears. The load-sharing characteristics of the PGS were investigated using a commercial software (Romax Technology Ltd.
This study investigated the PGS of a HMT system in a tractor to determine how the position error in a pinhole in the carrier of the planet gears affected load sharing among the gears. A simulation model was developed using a commercial software (Romax Technology Ltd.

제안 방법

Hence, the load-sharing factors of the corresponding gears differed. However, the similar sequences of the load magnitudes borne by the planet gears indicate that the present simulation model can be used to predict the load-sharing characteristics in a PGS.
The load-sharing factors of the gears also differed because the input torque and the stiffnesses could not be duplicated in the two models. However, the similarity of the load magnitude sequences in the two simulation models verified the present model for predicting the load-sharing characteristics of the PGS gears.
Meanwhile, the pinhole position errors were determined as 80, 40, -40, and 0 μm because the maximum geometric tolerance of the pinhole position in a carrier drawing was 80 μm. The load-sharing characteristics of the planet gears under different conditions were also analyzed using the verified simulation model. The pinhole position error in the carrier was varied in increments of 25 μm within the range 0-100 μm.
The model was verified by comparing its results with those of a model developed in a previous study (Singh, 2005). The verified simulation model was used to investigate the load-sharing characteristics of the PGS with respect to the magnitude of the pinhole position error in the carrier and the input torque to the PGS.

대상 데이터

Table 1 lists the PGS specifications. The PGS consists of a sun gear, five planet gears, a ring gear, and a planet carrier. The power is input to the sun and ring gears and transmitted to the carrier when the HMT system works in the powersplit mode.
The HMT system consists of a main shift comprising a PGS, an HSU, a gear train, a four-speed subshift, and a forward/reverse shift. The PGS in the mechanical transmission part comprises a compound PGS and a Wolfram PGS. The compound PGS is operated when the main shift output is the carrier (C), whereas the Wolfram PGS is operated when the output is a Stage 2 sun gear (S2) of the PGS.

참고문헌 (13)

American Gear Manufacturers Association (AGMA). 2006. Design Manual for Enclosed Epicyclic Gear Drives. ANSI/AGMA 6123-B06.
Bodas, A. and A. Kahraman. 2004. Influence of carrier and gear manufacturing errors on the static load sharing behavior of planetary gear sets. JSME International Journal 47(3):908-915.

상세보기
Goering, C. E., M. L. Stone, D. W. Smith and P. K. Turnquist. 2003. Off-road Vehicle Engineering Principles. Miami:The American Society of Agricultural Engineers (ASAE).
Hayashi, T., Y. Li, I. Hayashi, K. Endou and W. Watanabe. 1986. Measurement and some discussions on dynamic load sharing in planetary gears. Bulletin of the JSME 29:2290-2297.
Hidaka, T., Y. Terauchi and K. Dohi. 1979. On the relation between the run out errors and the motion of the center of sun gear in a Stoeckicht planetary gear. Bulletin of the JSME 22:748-754.

상세보기
Hidaka, T., Y. Terauchi and K. Nagamura. 1979. Dynamic behavior of planetary gear, 7th report, Influence of the thickness of the ring gear. Bulletin of the JSME 22:1142-1149.
International Organization for Standardization (ISO). 2003-2007. Calculation of load capacity of spur and helical gears. ISO:6336-(1:6).
Kahraman, A. and S. Vijayakar. 2001. Effect of internal gear flexibility on the quasi-static behavior of a planetary gear set. Transactions of the ASME 123:408-415.

상세보기
Prueter, P. E., R. G. Parker and F. Cunliffe. 2011. A study of gear root strains in a multi-stage planetary wind turbine gear train using a three dimensional finite element/contact mechanics model and experiments. Proceedings of the ASME 2011 International Design Engineering Technical Conferences & Computer and Information in Engineering Conference (IDETC/CIE 2011), Washington, DC, USA.
Park, Y. J., G. H. Lee, J. S. Song and Y. Y. Nam. 2013. Characteristic analysis of wind turbine gearbox considering non-torque loading. Journal of Mechanical Design 135(4):044501-(1:8).

상세보기
Romax Technology Ltd. 2003. Romax Designer Software Manual. Nottingham, UK.
Singh, A. 2005. Application of a system level model to study the planetary load sharing behavior. Journal of Mechanical Design 127:469-476.

상세보기
Sung, D. H., H. E. Kim, G. H. Lee and H. S. Kim. 2001. Power transmission characteristics of a hydromechanical transmission. Transactions of the Korean Society of Mechanical Engineers A 25(11):1854-1862.

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Characteristic Analysis of Planetary Gear Set of Hydromechanical Transmission System of Agricultural Tractors 원문보기

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Characteristic Analysis of Planetary Gear Set of Hydromechanical Transmission System of Agricultural Tractors 원문보기

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