• Title/Summary/Keyword: Gear Mechanism

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5-Axis CNC Machining of Roller Gear Cam (롤러 기어 캠의 5-축 CNC 가공)

  • Cho, Hyun-Deog;Yoon, Moon-Chul;Kim, Kyung-Jin
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.19 no.6
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    • pp.739-745
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    • 2010
  • The roller gear cam can control the rotational follower periodically by attaching several roller on the circumstance of follower shaft and it is widely used in non-backlash and precise actuating mechanism such as index table or ATC of machine tools. For machining the roller gear cam, 5 axis CNC machine tool is used and the geometric principle of CAM mechanism must be adopted to generate the NC-code and to develop the special CAD/CAM software because there is not commercial CAM system to machine the roller gear cam. The maker of the specially developed software in domestic user is generally from Japan or Taiwan. However these softwares do not reflect the post processing technique for finish machining in the module. Also, there is some limitation for further new application of itself and it needs higher costs for further application. In this study, the CAD/CAM software to overcome these problem was developed. And its reliability was verified by applying it in 5-axis CNC machining. Finally, the experimental result conducted in the 5-axis machining show good consistency in the movement of follower along the flute and in its Size.

Development of A Computer Simulation Program for the Design of High Speed Transplanting Mechanism(I) -Planting Loci and Motion Analysis- (고속 식부 기구 설계를 위한 컴퓨터 시뮬레이션 프로그램 개발(I) -식부 궤적과 운동 분석-)

  • Park, H.J.;Kim, K.U.
    • Journal of Biosystems Engineering
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    • v.18 no.2
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    • pp.91-99
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    • 1993
  • Kinematic analysis was made on a gear type high speed planting mechanism for riding-type rice transplanters. The kinematic equations thus derived were computer coded to simulate its motion characteristics such as a planting locus, velocities and accelerations of gears and planting knife, etc. Using the simulation program a sensitivity analysis of design parameters was also carried out to determine their effects on the planting performance. Of the design parameters the eccentricity of the gear was found most influential.

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A Study on the Parameters for Reduction of Transmission Vibration (변속기 진동 저감을 위한 파라미터 연구)

  • 안병민
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1997.10a
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    • pp.292-297
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    • 1997
  • The rattle noise is the most significant in many kinds of manual gearbox noises, which is generated at the idle stage of the engine operation. The main torsional vibration source of the driveline is the fluctuation of the engine torque. The gear rattle is impacts generating in the backlash of the free gear due to this torsional vibration. Many researchers reported the clutch torsional characteristic optimization method to reduce the idle gear rattle but only few of them give sufficient consideration to the system parameters like gear backlash, drag torque, system inertia, inertia distribution, engine torque fluctuation, idle engine rotation speed, and accessory load. This paper pays attention to the gear impact mechanism and system design parameters to reduce the idle gear rattle with computer simulation.

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A Study on the Clutch Damper Design Technique (클러치 댐퍼 설계 기법 연구)

  • 안병민;장일도;최은오;홍동표;정태진
    • Journal of KSNVE
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    • v.7 no.6
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    • pp.1031-1037
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    • 1997
  • The main torsional vibration source of the driveline is the fluctuation of the engine torque. The gear rattle is generated by an impact in the backlash due to this torsional vibration. Optimization of the clutch torsional characteristic is one of the effective methods to reduce the idle gear rattle. Many researches have been reported on this problem but only few of them give sufficient consideration to the detail clutch modeling and clutch design parameters (stiffness, hysteresis torque, preload, first stage length). This paper pays attention to the gear impact mechanism and clutch design parameters to reduce the idle gear rattle with computer simulation.

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A Study on the Design Technique to Reduce the Rattle Vibration (래틀 진동을 위한 설계 기법 연구)

  • 안병민;장일도;홍동표;정태진
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.562-566
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    • 1997
  • The main torsional vibration source of the driveline is the fluctuation of the engine torque. The gear rattle is impacts generating in the backlash of the free gear due to this torsional vibration Optimization of the clutch torsional characteristic is one of the effective methods to reduce the idle gear rattle. Many researches have been reported on this problem but only few of them give sufficient consideration to the full clutch design parameters(stiffness, hysteresis torque, preload, first stage length) and drag torque This paper pays attention to the gear impact mechanism, clutch design parameters and drag torque to reduce the idle gear rattle with computer simulation.

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Design Modification of Marine Turning Gear Based on Spur Planetary Gear (스퍼 유성감속기 기반 선박용 터닝기어의 설계 변경)

  • Kim, Kun-Woo;Lee, Jae-Wook;Jang, Jin-Seok;Oh, Joo-Young;Hong, Jong-Hae;Lee, Kang-Jae
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.12
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    • pp.7-14
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    • 2019
  • A marine turning gear controls the position of the piston-crank mechanism by rotating the flywheel of the marine engine at a low speed, which is the main auxiliary machine that enables the disassembly and maintenance of the engine. In this study, the safety factor for surface durability and tooth bending strength was improved by the design modification of the marine turning gear based on the spur planetary gear. Angular velocity, torque, and efficiency of the turning gear were measured using a reliability evaluation tester, and a multibody dynamics model for analysis corresponding to the test results was developed. Finally, it was confirmed that the design improvements improved the tooth surface damage of the sun gear in the 3rd reduction stage.

Development of Conical Spring-based Jumping Mechanism for a Portable Robot (소형로봇을 위한 원추형 스프링 기반의 도약 메커니즘의 개발)

  • Kim, Byeong-Sang;Lee, Jang-Woon;Kim, Hyun-Jung;Vu, Quy-Hung;Song, Jae-Bok
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.1195-1200
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    • 2007
  • It is desirable that the guard robot should be small-sized and light-weighted to increase its portability. In addition, it should be able to overcome a relatively high obstacle to cope with different situations. The jumping robot can reach a higher place more rapidly than other locomotion methods. This research proposes the jumping mechanism based on the conical spring for a small robot. Both the clutch mechanism and conical spring are incorporated into the jumping mechanism. In the clutch mechanism, the spring can be immediately compressed and released by one actuator with the planetary gear train and one-way clutch. The robot equipped with the jumping mechanism can overcome the obstacles which are higher than its height. In this paper, the characteristic of the conical spring for the jumping robot is determined and the small-sized, lightweight jumping mechanism is developed. The validity of the jumping mechanism was verified by various experiments. It is shown that the robot using this mechanism can provide good mobility in the rough terrain.

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Performance Evaluation of Vehicle Gear-shifting Supportive Device Utilizing MR Haptic Cue (MR 햅틱 큐를 이용한 차량 기어변속 보조장치의 성능평가)

  • Han, Young-Min;Min, Chul-Gi
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.2
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    • pp.160-166
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    • 2013
  • This paper proposes a driver supportive device with haptic cue function which can be applicable for vehicles adopting manual transmission system to transmit gear-shifting information to a driver by kinesthetic forces. This haptic cue function is implemented on accelerator pedal by utilizing magnetorheological(MR) fluid and clutch mechanism. In order to achieve this goal, an MR clutch mechanism is devised to be capable of rotary motion of accelerator pedal. The proposed MR clutch is then optimally designed and manufactured under consideration of spatial limitation of vehicles. After transmission torque is experimentally evaluated according to field intensity. The manufactured MR clutch is integrated with accelerator pedal and electric motor to establish the haptic cue device. Control performances are experimentally evaluated via a simple feed-forward control algorithm.

Compact electromagnetic vibration suppressor and energy harvester; an experimental study

  • Aref Afsharfard;Hooman Zoka;Kyung Chun Kim
    • Smart Structures and Systems
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    • v.33 no.3
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    • pp.217-225
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    • 2024
  • In this study, an electromagnetic dynamic vibration suppressor and energy harvester is designed and studied. In this system, a gear mechanism is used to convert the linear motion to continuous rotary motion. Governing equations of motion for the system are derived and validated using the experimental results. Effects of changing the main parameters of the presented system, such as mass ratio, stiffness ratio and gear ratio on the electro-mechanical behavior of system are investigated. Moreover, using so-called Weighted Cost Function, the optimum parameters of the system are obtained. Finally, it is shown that the presented electromagnetic dynamic vibration absorber not only can reduce the undesired vibration of the main system but also it can harvest acceptable electrical energy.

Characteristic Analysis of Axial Magnetic Harmonic Gear (액시얼 마그네틱 하모닉 기어의 특성 해석)

  • Won, Hunhee;Jung, Kwangsuk
    • Journal of Institute of Convergence Technology
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    • v.10 no.1
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    • pp.25-29
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    • 2020
  • Magnetic gears of non-contact power type have great advantages in terms of maintenance and repair than mechanical gears, and are used in various ways. Harmonic gears can derive a higher gear ratio than conventional gears through power transmission through a unique rotation mechanism. Magnetic harmonic gears, in which the gear teeth of the harmonic gears are replaced with magnets, have the advantages of both gears, but are difficult to implement and practical, so many studies are being conducted. In this study, we check whether the results of various types of magnetic gears can be applied to harmonic gears. By applying the axial type magnetic gear to the harmonic gear, the characteristic analysis is conducted to see if the result comparable to the existing radial type magnetic harmonic gear is obtained.