• Title/Summary/Keyword: worm gear

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Case Study for pitting of elevator's worm gear type traction machine (승강기용 웜기어 방식 권상기의 점식 발생 사례)

  • Seo, Sang-Yoon;Yang, Bo-Seok;Lee, Seon-Sun;Kim, Sung-Hyeob;Kim, Jae-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.04a
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    • pp.99-104
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    • 2012
  • This paper analyzes the pitting's cause of elevator's worm gear type traction machine. To find a cause of pitting problem, we analyzed vibration, a proper design allowance and lubrication. We brought a conclusion that the cause of pitting is not a simple vibration problem, such as misalignment of worm reducer and rail, but mostly related to a designed allowance. In this case, the allowance is tight. In general, the allowance of traction machine and lubrication is varied by manufacturers. When the allowance is tight, a proper lubrication can diminish the pitting problem.

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Development of Electric Motion Wheel Chair Driving System using Planetary Gear Device

  • Ham, Seong-Hun;Youm, Kwang-Wook
    • International journal of advanced smart convergence
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    • v.9 no.3
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    • pp.199-206
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    • 2020
  • A wheelchair is an essential rehabilitation assistant device for the movement of paraplegia patients and generally paralyzed patients who cannot walk normally. In particular, the applicability of the manual/motorized wheelchair is gradually increasing. Until now, decelerators using belt, chain and worm gears, etc have been widely used. However, a decelerator takes a large space although it is a simple device and thus is not ideal for the driving part of manual/motorized wheelchair. For these reasons, in this study we developed a driving part producing a large driving force through a decelerator using planetary gears rather than conventional worm gear-based decelerator. We designed the tooth profile of the planetary gears for decelerator using Kisssoft program, In addition, we designed the driving part so as to apply it to the wheels of conventional wheelchairs, and then optimized the mechanism for the principles of manual/motorized transposition of the driving part and the operational principles. Based on the results of this study, we finally designed and manufactured a driving part for wheelchair decelerator in the form of planetary gears with 1 sun gear, 2 planetary gears and 1 ring gear.

Optimization and Analysis of Output Pinion Design for Worm Gear Reducer (워엄기어 감속기의 출력피니언 최적설계와 해석)

  • Cho, Seonghyun;Kim, Hyeonkyeong;Kim, Dongseon;Zhen, Qin;Lyu, Sung-Ki
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.1
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    • pp.108-113
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    • 2020
  • Pinions are generally heavy and integrated with a shaft. Thus, fabricating a pinion is a material- and machining-intensive task characterized by low productivity. Contact of the output pinion with a sliding surface or a cloud contact causes loss of power because of friction. Consequently, the output pinion undergoes considerable wear and tear at its ends, which adversely affects the overall transmission efficiency of decelerators. To improve transmission efficiency and extend gear life, an optimum output pinion design is required. To this end, in this study, an output pinion for worm gear decelerators was designed and optimized by means of product verification through prototyping and performance evaluation to improve gear life and productivity. The optimized design was validated and subjected to structural analysis.

A Study on the Automated Design System for Gear (기어설계 자동화 시스템에 관한 연구)

  • Cho, H.Y.;Nam, G.J.;Oh, B.K.
    • Proceedings of the KSME Conference
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    • 2001.11a
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    • pp.730-733
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    • 2001
  • A computer aided design system for spur, helical, bevel and worm gears by using AutoCAD system and its AutoLISP computer language was newly developed in this study. Two methods are available for a designer to draw a gear. The first method needs the gear design parameters such as pressure, module, number of tooth, shaft angle, velocity, materials, etc. When the gear design parameters are inputted, a gear is drawn in AutoCAD system and maximum allowable power and shaft diameter are calculated additionally. The second method calculates all dimensions and gear design parameters to draw a gear when the information such as transmission, reduction ratio, rpm, materials and pressure are inputted. The system includes four programs. Each program is composed of a data input module, a database module, a strength calculation module, a drawing module, a text module and a drawing edit module. In conclusion, the CAD system would be widely used in companies to find the geometric data and manufacturing course.

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Radial Type Locomotive Mechanism with Worm for Robotic Endoscope (내시경 로봇을 위한 웜구동 방사형 이동메커니즘)

  • Kim, Kyoung-Dae;Lee, Seunghak;Kim, Byungkyu;Park, Jong-Oh
    • Journal of Institute of Control, Robotics and Systems
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    • v.8 no.3
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    • pp.220-225
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    • 2002
  • In this paper, we suggest a new locomotive mechanism fur self-propelling robotic endoscope which could substitute conventional endoscope. Many researchers proposed inchworm-like mechanism for self-propelling robotic endoscope. But it could not be commercialized because they did not solve the limitation caused by clamping. Therefore, we suggest a new radial-type locomotive mechanism with worm. It can propel itself in any situation and take passive-steering because of radial type. In addition, it can be miniaturized with worm. In this paper, we evaluate the mechanism in the dead pig colon as well as under various environments, and verify the performance fur robotic endoscope.

Preliminary Mechanism Design of Multi-Stage Gear Drives by Using a Fuzzy Expert System (퍼지 전문가 시스템을 이용한 다단 기어장치 메커니즘의 초기 설계)

  • 이호영;정태형;배인호
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.7
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    • pp.185-192
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    • 2003
  • This paper proposes an efficient mechanism design system of multi-stage gear drives including not only parallel shaft gears but also non-parallel gears such as bevel and worm gear drives. The system automatically generates three dimensional structures of specification-adjusted mechanisms, and shows the sorted list of the mechanisms according to the evaluation result by using a fuzzy expert system. The list can be used as reliable candidates of the spatial mechanism structures of multi-stage gear drives. Thus, it is expected that the system can increase the efficiency of design and cut off the expenses of preliminary design considerably.

Study on the Total Design of a Conical Involute Gear (코니칼 인볼류트 기어의 Total 설계에 관한 연구)

  • Kim, Jun-Seong;Lee, Do-Young;Kang, Jai-Hwa;Xu, Zhe-Zhu;Lyu, Sung-Ki
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.13 no.2
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    • pp.100-107
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    • 2014
  • Currently, there are many power transmission devices, including gears, friction wheels, chains, and belts. Because the power transmission of gears is most certainin these devices, gears are widely used in different power transmission fields and environments. In accordance with the gear shape, gears can be classified as cylindrical gears and conical gears. A cylindrical gear, which provides a means of power transmission under parallel axis and skewed axis conditions, contains a spur gear, a helical gear and a worm gear. A conical gear, which can be used on a skewed axis as well as parallel and crossed axes, includes a bevel gear(e.g., straight bevel, spiral bevel, hypoid gear) and a conical involute gear(or a bevel oid gear). In this paper, a conical involute gear which utilizes the fabrication method of other involute gears such as spur and helical gears using a CNC hobbing machine is discussed.

Case Study for Pitting of Elevator's Worm Gear Type Traction Machine (승강기용 웜기어 방식 권상기의 점식 발생 사례)

  • Seo, Sang-Yoon;Choi, Byeong-Keun;Yang, Bo-Suk;Lee, Seon-Sun;Kim, Sung-Hyeob
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.11
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    • pp.1064-1070
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    • 2012
  • This paper analyzes the pitting's cause of elevator's worm gear type traction machine. To find a cause of pitting problem, we analyzed vibration, a proper design allowance and lubrication. We brought a conclusion that the cause of pitting is not a simple vibration problem, such as misalignment of worm reducer and rail, but mostly related to a designed allowance. In this case, the allowance is tight. In general, the allowance of traction machine and lubrication is varied by manufacturers. When the allowance is tight, a proper lubrication can diminish the pitting problem.

Transmission Error Analysis of the Helical Gears for the Elevator (엘리베이터용 헬리컬기어의 전달오차 해석)

  • Park, Chan-Il;Kim, Dae-Sik
    • Proceedings of the KSME Conference
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    • 2001.06c
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    • pp.470-475
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    • 2001
  • The elevator gear box with the helical gears needs to be developed instead of the one with the worm gears to improve the efficiency. In order to develop the gear box, the analytical tool to predict the helical gear noise is necessary to meet customer's noise requirement. Gear noise is related to the loaded transmission error. Therefore, the simulation program for the loaded transmission error analysis of the helical gears is developed in this study. Using the developed program, the effects of tooth modification such as tip relief and the extent of tip relief are investigated. Finally, the procedures to determine the tip relief and the extent of tip relief are proposed.

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Transmission Error Analysis of the Helical Gears for the Elevator (엘리베이터용 헬리컬기어의 전달오차 해석)

  • Park, Chan-Il;Kim, Dae-Sik
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.12
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    • pp.2695-2702
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    • 2002
  • The elevator gear box with the helical gears needs to be developed instead of the one with the worm gears to improve the efficiency. In order to develop the gear box, the analytical tool to predict the helical gear noise is necessary to meet customer's noise requirement. Gear noise is related to the loaded transmission error. Therefore, the simulation program fer the loaded transmission error analysis of the helical gears is developed in this study. Using the developed program, the effects of tooth modification such as tip relief and the extent of tip relief are investigated. Finally, the procedures to determine the tip relief and the extent of tip relief are proposed.