A Strength Analysis of Gear Train for Hydro-Mechanical Continuously Variable Transmission

Myung Ho Bae,Tae Yeol Bae,Young Rak Yoo 국제문화기술진흥원 2018 International Journal of Advanced Culture Technolo Vol.6 No.3

The power train of hydro-mechanical continuously variable transmission(HMCVT) for the middle class forklift makes use of an hydro-static unit, hydraulic multi-wet disc brake & clutches and complex helical & planetary gears. The complex helical & planetary gears are a very important part of the transmission because of strength problems. The helical & planetary gears belong to the very important part of the HMCVT`s power train where strength problems are the main concerns including the gear bending stress, the gear compressive stress and scoring failures. The present study, calculates specifications of the complex helical & planetary gear train and analyzes the gear bending and compressive stresses of the gears. It is necessary to analyze gear bending and compressive stresses confidently for an optimal design of the complex helical & planetary gears in respect of cost and reliability. This paper not only analyzes actual gear bending and compressive stresses of complex helical & planetary gears using Lewes & Hertz equation, but also verifies the calculated specifications of the complex helical & planetary gears by evaluating the results with the data of allowable bending and compressive stress from the Stress - No. of cycles curves of gears. In addition, this paper explains actual gear scoring and evaluates the possibility of scoring failure of complex helical & planetary gear train of hydro-mechanical continuously variable transmission for the forklift.

A study on the bending stress of the hollow sun gear in a planetary gear train

고경은,임도형,김판영,박진수 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.1

Generally, planetary gear type traveling reduction gear is composed of multiple planetary gear stages and has a hollow sun gear in the last stage planetary gear. In designing reduction gear, it is important to evaluate accurately the bending stress at the tooth root of the sun gear as the sun gear is the weakest component in the reduction gear system. Although bending stress can be calculated easily using gear standard codes such as the American Gear Manufacturers Association (AGMA) and International Organization for Standardization (ISO)6336 for almost all gears, meticulous calculation is needed for the hollow sun gear because of its low backup ratio (rim thickness divided by tooth height) and comparatively large root fillet radius. In this study, a finite element analysis (FEA) is carried out to investigate the effect of rim thickness and root fillet radius on bending stress at the tooth root of the hollow sun gear. In standard codes, bending stress at the tooth root is calculated linearly with a constant slope for the backup ratio below 1.2. However, the effect of the rim thickness on bending stress is more complex in the planetary gear system. Bending stresses calculated by FEA with various backup ratios and root filler radii are compared with the bending stresses calculated by the standard codes.

기계유압식 무단변속기용 기어류의 강도해석에 관한 연구

배명호(Myung Ho Bae),배태열(Tae Yeol Bae) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11

The power train of hydro-mechanical continuously variable transmission for forklift makes use of hydro-static unit, hydraulic multi-wet disc brake & clutches and complex helical & planetary gears. The complex helical & planetary gears are very important parts of the transmission for forklift because of a strength problem. In the present study, calculating specifications of the complex helical & planetary gear train and analyzing the gear bending and compressive stresses of the gears. It is necessary to analyze gear bending and compressive stresses confidently for optimal design of the complex helical & planetary gears in respect of cost and reliability. In the paper, analyze actual gear bending and compressive stresses of complex helical & planetary gears using Lewes & Hertz equation, also verify the calculated specifications of the complex helical & planetary gears by evaluating the results with the data of allowable bending and compressive stress from the Stress - No. of cycles curves of gears. In addition, in this paper also analyze actual gear scoring and evaluate the possibility of scoring failure of complex helical & planetary gear train of hydro-mechanical continuously variable transmission for forklift.

The Stress Analysis of Planetary Gear System of Mixer Reducer for Concrete Mixer Truck

배명호,배태열,조연상,손호연,김당주 사단법인 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.4

In general, the gears of mixer reducer for concrete mixer truck make use of the differential type planetary gear system to rotate mixer drum smoothly on the initial conditions. The planetary gear system is very important part of mixer reducer for concrete mixer truck because of strength problem. In the present study, calculating the gear specifications and analyzing the gear bending & compressive stresses of the differential planetary gear system for mixer reducer are necessary to analyze gear bending and compressive stresses confidently, for optimal design of the planetary gear system in respect to cost and reliability. As a result, analyzing actual gear bending and compressive stresses of the planetary gear system using Lewes & Hertz equation and verifying the calculated specifications of the planetary gear system, evaluate the results with the data of allowable bending and compressive stress from the Stress-No. of cycles curves of gears.

The Stress Analysis of Planetary Gear System of Mixer Reducer for Concrete Mixer Truck

Myung Ho Bae,Tae Yeol Bae,Yon Sang Cho,Ho Yeon Son,Dang Ju Kim 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10

In general, the gears of mixer reducer for concrete mixer truck make use of the differential type planetary gear system to rotate mixer drum smoothly on the initial conditions. The planetary gear system is very important part of mixer reducer for concrete mixer truck because of strength problem. We calculate the gear specifications and analyze the gear bending & compressive stresses of the differential planetary gear system of mixer reducer. It is necessary to analyze gear bending and compressive stresses confidently for optimal design of the planetary gear system in respect of cost and reliability. Thus, we analyze actual gear bending and compressive stresses of the planetary gear system using Lewes & Hertz equation and verify the calculated specifications of the planetary gear system by evaluating the results with the data of allowable bending and compressive stress from the Stress-No. of cycles curves of gears.

The Stress Analysis of Planetary Gear System of Mixer Reducer for Concrete Mixer Truck

Myung Ho Bae,Tae Yeol Bae,Yon Sang Cho,Ho Yeon Son,Dang Ju Kim 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.4

In general, the gears of mixer reducer for concrete mixer truck make use of the differential type planetary gear system to rotate mixer drum smoothly on the initial conditions. The planetary gear system is very important part of mixer reducer for concrete mixer truck because of strength problem. In the present study, calculating the gear specifications and analyzing the gear bending & compressive stresses of the differential planetary gear system for mixer reducer are necessary to analyze gear bending and compressive stresses confidently, for optimal design of the planetary gear system in respect to cost and reliability. As a result, analyzing actual gear bending and compressive stresses of the planetary gear system using Lewes & Hertz equation and verifying the calculated specifications of the planetary gear system, evaluate the results with the data of allowable bending and compressive stress from the Stress-No. of cycles curves of gears.

The Stress Analysis of Planetary Gear System of Mixer Reducer for Concrete Mixer Truck

Bae, Myung Ho,Bae, Tae Yeol,Cho, Yon Sang,Son, Ho Yeon,Kim, Dang Ju The Korean Society for Fluid Power and Constructio 2015 드라이브·컨트롤 Vol.12 No.4

In general, the gears of mixer reducer for concrete mixer truck make use of the differential type planetary gear system to rotate mixer drum smoothly on the initial conditions. The planetary gear system is very important part of mixer reducer for concrete mixer truck because of strength problem. In the present study, calculating the gear specifications and analyzing the gear bending & compressive stresses of the differential planetary gear system for mixer reducer are necessary to analyze gear bending and compressive stresses confidently, for optimal design of the planetary gear system in respect to cost and reliability. As a result, analyzing actual gear bending and compressive stresses of the planetary gear system using Lewes & Hertz equation and verifying the calculated specifications of the planetary gear system, evaluate the results with the data of allowable bending and compressive stress from the Stress-No. of cycles curves of gears.

A Strength Analysis of Gear Train for Hydro-Mechanical Continuously Variable Transmission

배명호,배태열,유영락 국제문화기술진흥원 2018 International Journal of Advanced Culture Technolo Vol.6 No.3

The power train of hydro-mechanical continuously variable transmission(HMCVT) for the middle class forklift makes use of an hydro-static unit, hydraulic multi-wet disc brake & clutches and complex helical & planetary gears. The complex helical & planetary gears are a very important part of the transmission because of strength problems. The helical & planetary gears belong to the very important part of the HMCVT`s power train where strength problems are the main concerns including the gear bending stress, the gear compressive stress and scoring failures. The present study, calculates specifications of the complex helical & planetary gear train and analyzes the gear bending and compressive stresses of the gears. It is necessary to analyze gear bending and compressive stresses confidently for an optimal design of the complex helical & planetary gears in respect of cost and reliability. This paper not only analyzes actual gear bending and compressive stresses of complex helical & planetary gears using Lewes & Hertz equation, but also verifies the calculated specifications of the complex helical & planetary gears by evaluating the results with the data of allowable bending and compressive stress from the Stress - No. of cycles curves of gears. In addition, this paper explains actual gear scoring and evaluates the possibility of scoring failure of complex helical & planetary gear train of hydro-mechanical continuously variable transmission for the forklift.

A Strength Analysis of Gear Train for Hydro-Mechanical Continuously Variable Transmission

Bae, Myung Ho,Bae, Tae Yeol,Yoo, Young Rak The International Promotion Agency of Culture Tech 2018 International Journal of Advanced Culture Technolo Vol.6 No.3

The power train of hydro-mechanical continuously variable transmission(HMCVT) for the middle class forklift makes use of an hydro-static unit, hydraulic multi-wet disc brake & clutches and complex helical & planetary gears. The complex helical & planetary gears are a very important part of the transmission because of strength problems. The helical & planetary gears belong to the very important part of the HMCVT's power train where strength problems are the main concerns including the gear bending stress, the gear compressive stress and scoring failures. The present study, calculates specifications of the complex helical & planetary gear train and analyzes the gear bending and compressive stresses of the gears. It is necessary to analyze gear bending and compressive stresses confidently for an optimal design of the complex helical & planetary gears in respect of cost and reliability. This paper not only analyzes actual gear bending and compressive stresses of complex helical & planetary gears using Lewes & Hertz equation, but also verifies the calculated specifications of the complex helical & planetary gears by evaluating the results with the data of allowable bending and compressive stress from the Stress - No. of cycles curves of gears. In addition, this paper explains actual gear scoring and evaluates the possibility of scoring failure of complex helical & planetary gear train of hydro-mechanical continuously variable transmission for the forklift.

지게차용 기계유압식 무단변속기의 기어류에 대한 강도해석

배명호(Myung Ho Bae),배태열(Tae Yeol Bae),최성광(Sung Kwang Choi) 유공압건설기계학회 2016 드라이브·컨트롤 Vol.13 No.4

The power train of a hydro-mechanical, continuously variable transmission for forklifts makes use of hydro-static units, hydraulic multi-wet disc brakes & clutches, and complex helical & planetary gears. The complex helical & planetary gears are very important parts of the transmission because of a strength problem. In the present study, we calculated the specifications of the complex helical & planetary gear train, and analyzed the gear bending and compressive stresses of the gears. It is necessary to analyze the gear bending and compressive stresses thoroughly for optimal design of the complex helical & planetary gears with respect to cost and reliability. In this paper, we analyze the actual gear bending and compressive stresses of complex helical & planetary gears using the Lewes & Hertz equation, and we also verify the calculated specifications of the complex helical & planetary gears by evaluating the results of the data of allowable bending and compressive stress using the Stress vrs Number of Cycles curves of gears.