• 제목/요약/키워드: gear ratio

검색결과 327건 처리시간 0.028초

Analysis of Coaxial Magnetic Gear with Low Gear Ratios for Application in Counter Rotating Systems

  • Shin, H.M.;Chang, J.H.
    • Journal of Magnetics
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    • 제20권2호
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    • pp.186-192
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    • 2015
  • This paper describes the electromagnetic and mechanical characteristics of coaxial magnetic gear (CMG) with a low gear ratio. The analysis models are restricted to a CMG with a gear ratio of less than 2. The electromagnetic characteristics including transmitted torque and iron losses are presented according to the variation of the gear ratio. The pole pairs of high speed rotor are chosen as 6, 8 and 10 by considering the torque capability. As the gear ratio approaches 1, both iron losses on the ferromagnetic materials and eddy current losses on the rotor permanent magnets are increased. The radial and tangential forces on the modulating pieces are calculated using the Maxwell stress tensor. When the maximum force is exerted on the modulating pieces, the mechanical characteristics including stress and deformation are derived by structural analysis. In CMG models with a low gear ratio, the maximum radial force acting on modulating pieces is larger than that in CMG models with a high gear ratio, and the normal stress and normal deformation are increased in a CMG with a low gear ratio. Therefore, modulating pieces should be designed to withstand larger radial forces in CMG with a low gear ratio compared to CMG with a high gear ratio.

New Methods to Split Overall Gear Ratio of the Cylindrical Multi-Stage Gear Train (원통 기어로 구성된 다단 기어열의 기어비 분할법 개발)

  • 배인호;정태형
    • Transactions of the Korean Society of Machine Tool Engineers
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    • 제11권6호
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    • pp.45-51
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    • 2002
  • The existing methods to split overall gear ratio of the cylindrical multi-stage gear train have their own limitations to be used in practical design and are also problematic to be implemented in a formalized algerian. This paper proposes two types of new methods to find gear ratios best approximating the overall gear ratio. The proposed methods are quite general to be applied to the gear train having any number of stages, and offer a considerably good result in a very short time. The first method uses the random search method and the second one is based on the simulated annealing algorithm. The proposed algorithms are expected to be very useful not only as an independent program to split overall gear ratio, but also as a desist sub-module for the integrated desist system of multi-stage gear drives.

Design and Analysis of Gear Train with Composition of Optimum Gear Ratio (최적 치차비 구현을 통한 치차열의 각도 위치 오차 설계 및 해석)

  • Yun, Jae-Yun
    • Journal of the Korean Society for Precision Engineering
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    • 제18권6호
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    • pp.102-108
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    • 2001
  • This paper addresses an analytical approach to the mechanical error analysis of gear train and tolerance design and manufacture of gear train in restricted space considering motor driving torque, driving system inertia, motor acceleration, motor rotor inertia and friction torque. The gear train is designed to have optimum gear ratio in restricted space and each gear is manufactured to have the lowest weight and each gear tooth is heat-treated to have robustness. Based on the small difference between the mechanical error analysis and measurement, gear train design with optimum gear ratio and restricted space and robustness is proposed.

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Design, manufacture and analysis of gear train with composition of optimum gear ratio (최적 기어비 구현을 통한 치차열의 설계, 제작 및 분석)

  • 정상목;윤재윤
    • Journal of the Korea Institute of Military Science and Technology
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    • 제2권1호
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    • pp.132-138
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    • 1999
  • This paper addresses an analytical approach to the mechanical error analysis of gear train and tolerance design and manufacture of gear train in restricted space considering motor driving torque, driving system inertia, motor acceleration, motor rotor inertia and friction torque. The gear train is designed to have optimum gear ratio in restricted space and each gear is manufactured to have the lowest weight and each gear tooth is heat-treated to have robustness. Based on the small difference between the mechanical error analysis and measurement, gear train design with optimum gear ratio and restricted space and robustness is proposed

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A Study on Automatic Technology for a industrial Industrial Involute Gears Design (산업용 인벌류트 치차 설계를 위한 자동화 기술에 관한 연구)

  • 조성철;변문현
    • Journal of the Korean Society of Safety
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    • 제12권4호
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    • pp.39-46
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    • 1997
  • This study describes a computer aided design system on involute gear for power transmition. Input data for gear design are pressure angle $20^{\circ}$, transmitted power, gear volume, gear ratio, addendum ratio of rack, dedendum ratio of rack, edge radius of rack, allowable contact stress and allowable bending stress etc. Bending strength contact strength and scoring are considered as the design constraints. Method of optimization developed this study. The developed gear design system can design the optimized gear that minimize the number of pinion teeth with face tooth.

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Generation and Preliminary Design of Compound Multi-Stage Gear Drive Mechanisms (복합 다단 기어장치 메커니즘의 생성 및 초기설계)

  • 정태형;김장수;박승현
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 한국공작기계학회 2003년도 추계학술대회
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    • pp.53-58
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    • 2003
  • In recent years, the need for multi-stage gear drives, which highly reduce output speed, has been increased. However, the design of multi-stage gear drives have been carried out by a limited number of experts. The consideration for the direction of input and output axes also makes their design very difficult. The purpose of this study is to develop an algorithm for automatically generating complex multi-stage gear drives and to implement a design supporting system for multi-stage gear drives. There are 4 stages in the proposed algorithm, and major design parameters,.such as the direction of input and output axes, reduction ratio, etc. are set up in the first stage. In the second stage, all mechanisms are generated, and various rules are applied to select feasible mechanisms. In the third stage, the gear ratio of each stage is divided from total gear ratio. Next, the specifications of gears for feasible mechanisms are calculated and their bending strength and surface durability are estimated. In the forth stage, appraised indexes are calculated and provided to support the estimation of the generated gear drives.

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Generation and Preliminary Design of Compound Multi-Stage Gear Drive Mechanisms (복합 다단 기어장치 메커니즘의 생성 및 초기설계)

  • Chong Tae-Hyong;Kim Jang-Soo;Park Seung-Hyun
    • Transactions of the Korean Society of Machine Tool Engineers
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    • 제14권4호
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    • pp.41-48
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    • 2005
  • In recent years, the need for multi-stage gear drives which highly reduce output speed has been increased. However, the design of multi-stage gear drives has been carried out by a limited number of experts. The consideration for the direction of input and output axes also makes their design very difficult. The purpose of this study is to develop an algorithm for automatically generating complex multi-stage gear drives and to implement a design supporting system for multi-stage gear drives. There are 4 stages in the proposed algorithm, and major design parameters, such as the direction of input and output axes, reduction ratio, etc. are set up in the first stage. In the second stage, all mechanisms are generated, and various rules are applied to select feasible mechanisms. In the third stage, the gear ratio of each stage is divided from total gear ratio. Next, the specifications of gears for feasible mechanisms are calculated and their bending strength and surface durability are estimated. In the forth stage, appraised indexes are calculated and provided to support the estimation of the generated gear drives.

Gear Train Design of 8-Speed Automatic Transmission for Tractor (트랙터 8단 자동변속기 기어 열 설계)

  • Jung, G.H.
    • Journal of Drive and Control
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    • 제10권2호
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    • pp.30-36
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    • 2013
  • Tractor is a farm vehicle that is designed to provide a high tractive effort at low speed. It is used for versatile agricultural tasks such as hauling a trailer, tillage, mowing and construction work. Most older tractors use a manual transmission. However, as the intensity of work increases, tractors equipped with automatic transmission become popular due to the work convenience. In order to give the operator a large degree of control in field work, 24 gears with automatic 8-speed and manual 3-speed are arranged in transmission. This paper deals with the gear train that is designed for 8-speed automatic transmission by the engagement of multi-disk clutches. The gear ratio for each speed as well as power transmission mechanism is analyzed through velocity analysis. In addition, constraints of mesh gear ratio are derived by investigating the power flow path in velocity diagram for the given 8-speed gear ratio.

Multi-gear Combination Analysis for High Gear Ratio of Coaxial Magnetic Gear (동축 마그네틱 기어의 고 기어비 적용을 위한 다중 기어 조합분석)

  • Park, Eui-Jong;Kim, Yong-Jae
    • The Journal of the Korea institute of electronic communication sciences
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    • 제16권2호
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    • pp.355-362
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    • 2021
  • Since coaxial magnetic gears use non-contact power transmission, friction, wear, noise, and heat generated in the power transmission process of existing mechanical gears can be minimized. Currently, research for application to various industries is being actively conducted, but among the characteristics of coaxial magnetic gears, the problem of rapidly decreasing torque density at a high gear ratio was discussed. This paper proposes a direction for multiple gear combination using low gear ratio coaxial magnetic gears with high torque density. In order to confirm the effectiveness of the method, the torque density was compared with a single high gear ratio model, and the combination and design direction of multiple coaxial magnetic gears were shown.

Development of Dual Stage Profile Shifted Gear System with Bearing-Integrated Structure for High Reduction Ratio (고감속비를 가지는 베어링일체형 구조의 2단 전위 감속기의 개발)

  • Hwang, Il-Kyu;Choi, Jung-Soo;Jung, Moon-Soo
    • Korean Journal of Computational Design and Engineering
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    • 제17권5호
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    • pp.312-323
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    • 2012
  • Planetary gearing is a gear system consisting of one or more planet gears, revolving about a sun gear. While the planetary gear system has many advantages- for example, high power density, large reduction in a small volume, multiple kinematic combinations, pure torsional reactions, and coaxial shafting, it has not been widely used because of its high bearing loads, inaccessibility, and design complexity. It is also necessary to shift several pairs of gear profiles at a same time. Therefore, designing profile shifted planetary gear system is a difficult and know-how dependent job. This study provides a practical solution to design a profile shifted gear system by the procedural design scheme, and proposes a bearing integrated structure of the dual stage profile shifted gear system with a robust output end. A dual stage profile shifted gear system with the bearing integrated structure is manufactured by the proposed design scheme in this study. This gear system is verified that it is good enough to commercialize, because it has high performance with high gear ratio and robust output end against axial and radial directional runouts in a small space.