• Title/Summary/Keyword: 면압강도

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Development of Strength and Durability Estimation System for Power Transmission Cylindrical Gears (원통치차의 강도평가 시스템 개발연구)

  • 정태형;변준형
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.1
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    • pp.112-119
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    • 1993
  • A strength and durability estimation system of involute cylindrical gears which are commonly used as power transmission devices is developed on the personal computer, which analyzed and/or evaluates the gear design and the service performance at the point of view of strength and durability. The typical considerations are the bending strength and the sunface durability, and the strength and durability estimations are carried out using the reliable standards of AGMA&ISO. In addition, the finite element analysis (FEM) of tooth bending stress is conducted in order to compare the real maximum stress with the estimaed bending stress by the standard. Therefore, the system is built so that the variables or factors considered differently in those standards and the strength & durability are appraised seperately by each method, and a series of the estimation processes is integrated into the system can be used in the initial design at the view point of strength and durability. And it is useful to the purpose of the trouble-shooting of gear system and the purpose of introducing the methods for maintaining design strength in service, with appraising the strength and durability after design or with appraising the influencing factors, as a whole. Therefore, this strength and durability estimation system can help the aim of automatic design of cylindrical gears.

Development of Rating Systems for Power Transmission Bevel Gears (동력전달용 베벨기어의 강도평가 시스템 개발 연구)

  • Chong, T.H.;Chi, J.J.;Byun, J.H.
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.7
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    • pp.66-73
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    • 1995
  • Rating systems of bevel gears(straight, spiral, and zerol bevel gears) which are commonly used as power transmission devices for non-papallel axes are developed on the personal computer, which analyze and/or evaluate the gear design and the service performance at the point of view of strength and durability. The typical considerations of the ratings are the bending strength, the surface durability, and the scoring resistance. The ratings are carried out using the reliable standards of AGMA & Gleason Works. Therefore, the system is built so that the variables or factors considered differently in those standards and the strength, dura- bility, and scoring partially in Gleason are appraised seperately by each method, and a series of the estimation processes is integrated into the system so as to compare each result. The developed rating systems can be used in the initial stage of gear design process, and also a better design can be performed by the evaluation of the initial design at the view point of gear strength and durability. Additionally, it is useful for the trouble-shooting of bevel gear system and to the purpose of introducing the methods for maintaining design strength in service, with appraising the gear strength after design or with appraising the influencing factor as a whole. Therefore, this rating systems can help the aim of design automation of bevel gears.

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Development of the Decelerator for Briquetting Machine with Low Vibration (저진동 슬래그 분쇄장치용 감속기 개발)

  • Lee, Hyoung Woo;Hur, Nam Soo;Kim, In Hwan
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.8
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    • pp.1043-1049
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    • 2012
  • In order to develop the decelerator for briquetting machine which composed of multi-staged gears, shafts and bearings, static design of the decelerator has been carried out through the analysis of bending and face forces, including structural analysis, applied on those teeth in accordance with AGMA(American Gear Manufacturers Association) standard. And also, dynamic design has been carried out with considering of vibratory forces caused by unbalance mass and transmitting error of gear. On the results of vibration analysis, it has been confirmed that there is not any critical speed within its operating range.

Design of Electric Automatic Manual Wheelchair Driving System (수·전동 휠체어 구동부 시스템 설계)

  • Kim, Jin-Nam
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.11
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    • pp.5392-5395
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    • 2013
  • Application of electric wheelchair, sort of wheelchair which is playing important role in transporting patients and old people, has been increasing. In this study, we designed the electric wheelchairs' driving system. Using the multi-step gear, the driving system can get great power, even though the small capacity of motors. First, we designed the multi-step gear, test its bending strength and contact strength, as well as verified its performance. We installed 'B-type electric brake(Multiple plate clutch, Anti-magnetization) in same axle of the driving system, so it is possible to stop under huge torque and small size. Using this driving system of the multi-step gear which we designed, it's possible to improve driving gear efficiency 30% up and create the high-competitive electric wheelchair. And, it is easy to repair and control.

Computer-Aided Design of Involute Cylindrical Gears for Power Transmission (컴퓨터를 이용한 동력전달용 인벌류우트 원통치차의 설계)

  • 정태형;김민수
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.14 no.3
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    • pp.594-602
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    • 1990
  • A computer-aided design system of involute cylindrical gears(spur and helical gears) for power transmission is developed, in which the volume of a gear unit is minimized with satisfying various design constraints. As the design constraints, bending strength and pitting resistance of AGMA 218.01, scoring of Dudley's flash temperature, contact ratio, and involute interference of pinion are considered and effective factors for strength calculation(life, reliability, hardness ratio, load distribution, velocity, etc.) are also included. This complicated nonlinear optimization problem is solved by using ALM(Augmented-Lagrange-Multiplier) method with self scaling BFGS(Broydon-Fletcher-Goldfarb-Shanno) method employed for unconstrained optimization programming. This design method can be easily applied to designing power transmission gear unit in the machines of various kinds. It is expected for the proposed method to be a contribution for an automated design of gear unit towards weight minimization, miniaturization and high strength of gear unit.

Contact Stress of Slewing Ring Bearing with External Pinwheel Gear Set (핀 휠을 구비한 외륜형 선회베어링의 면압강도)

  • Kwon, Soon-man
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.24 no.2
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    • pp.231-237
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    • 2015
  • The pin-gear drive is a special form of fixed-axle gear mechanism. A large wheel with cylindrical pin teeth is called a pinwheel. As pinwheels are rounded, they have a simple structure, easy processing, low cost, and easy overhaul compared with general gears. They are also suitable for low-speed, heavy-duty mechanical transmission and for occasions with more dust, poor lubrication, etc. This paper introduces a novel slewing ring bearing with an external pinwheel gear set (e-PGS). First, we consider the exact cam pinion profile of the e-PGS with the introduction of a profile shift. Then, the contact stresses are investigated to determine the characteristics of the surface fatigue by varying the shape design parameters. The results show that the contact stresses of the e-PGS can be lowered significantly by increasing the profile shift coefficient.

기어의 스코어링 강도해석

  • 이성철
    • Tribology and Lubricants
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    • v.9 no.2
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    • pp.1-8
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    • 1993
  • 기어가 비교적 큰 하중과 고속의 운전상태에서 사용되는 경우 되풀이 응력에 의한 피로를 대상으로 하는 면압이나 굽힘강도 이외에 치면에서 발생되는 긁힘이나 융착(瀜着) 또는 용착(溶着)을 대상으로 한 스코어링(scoring) 강도를 고려하여야 한다. 스코어링은 주로 치의 이끝 부분에서 접촉방향으로 긁힘이 나타나는 손상으로 특징지워진다. 미국기어제조협회(AGMA)에서는 윤활막 파손에 의한 금속과 금속과의 접촉에 기인하여 발생되는 여러형태의 손상, 예를 들면 scuffing, seizing, galling 등을 광범위하게 스코어링으로 통칭하고 있다. 미국계통의 기술분야에서는 스코어링을 고온 스코어링(hot scoring)과 저온 스코어링(cold scoring)으로 구분하고 있다. 고온 스코어링은 고속 운전시 표면의 섬광온도(flash temperature)에 기인한 용착과 접촉방향으로 재료를 이탈시키는 형태를 나타내고, 저온 스코어링은 저속의 기어에서 윤활막 파단으로 표면에 줄질(filing)한 듯한 손상이 발생되는 것을 나타낸다. 유럽에서는 고온 스코어링 손상은 스커핑이라 하고 저온 스코어링손상만을 스코어링이라 부르고 있다.

Developing Planetary Gear Reduction Design Software for the Planetary Gear Design and Durability Strength Analysis of Armored Vehicle's Transmission (장갑차용 트랜스미션의 유성기어 설계 및 내구 강도 분석을 위한 유성기어 감속기 설계 소프트웨어의 개발)

  • SinHyun Kang;SungHo Park;YonSang Cho
    • Tribology and Lubricants
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    • v.39 no.5
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    • pp.173-182
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    • 2023
  • The composite planetary gear reducer, a power transmission component of armored vehicles, operates at a high torque and is used in severe environments such as mountain, gravel or unpaved roads. Therefore, they must be designed and manufactured to have high durability. To design such a planetary gear reducer, there are numerous specifications to validate, such as selecting the module and the number of teeth of each gear satisfied the requirements, and calculating gear specifications and durability strength. Because planetary gears constitute a combination of several gears, there are many restrictions and interferences in selecting the number of teeth and addendum modification coefficients, and designing the tooth shape. Developing an auto design program is necessary to design various planetary gears more conveniently and quickly. In this study, a planetary gear reducer design software, widely used in various machines and armored vehicles, was developed. This design software can automatically select the number of teeth and modules of the gears, calculate specifications and quickly evaluate its fatigue durability strength and scoring failure according to the planetary gear reducer design theory.

Development of the Multi-Gear Train Devices of Synchro System for the Guns of a Warship which Considered the Noise/Vibration (소음/진동을 고려한 함포용 Synchro System의 다단 기어 구동장치 개발)

  • Lee, Hyoung-Woo;Hur, Nam-Soo;Kim, In-Hwan;Lee, Dong-Hwan
    • Journal of Advanced Marine Engineering and Technology
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    • v.34 no.8
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    • pp.1057-1067
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    • 2010
  • Vibration and noise analysis as well as strength of gear teeth, gear profile design are considered in order to develop the multi-gear train devices of synchro system for the guns of a warship. A new approach to the critical speed calculation of practical industrial multi-mesh geared system is presented. A transfer matrix model based on Hibner's branch method is developed and the natural properties of the branched rotor system are calculated with using the ${\lambda}$-matrix formulation. A Campbell diagram, in which the excitation sources caused by the mass unbalance of the rotors and the transmitted errors of the gearing are considered, shows that, at theoperating speed, there are not the critical speed.

The Strength Analysis of Gears on Hydro-Mechanical Continuously Variable Transmission for Forklift (지게차용 기계유압식 무단변속기의 기어류에 대한 강도해석)

  • Bae, Myung Ho;Bae, Tae Yeol;Choi, Sung Kwang
    • Journal of Drive and Control
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    • v.13 no.4
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    • pp.45-51
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    • 2016
  • 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.