• 한국정밀공학회지
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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.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 춘계학술대회논문집
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• pp.224-231
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• 2006

A six-degree-of-freedom dynamic model with time-varying mesh stiffness/damping and friction has been developed for the dynamic analysis of a gear driving system. This model includes a spur gear pair, bearing, friction and prime mover. Using Newton???s method, equations of motion for the gear driving system were derived. Two computer programs are developed to calculate mesh stiffness, transmission error and friction force and analyze the dynamics of the modeled system using a time integration method. The influences of mesh stiffness/damping, bearing, and friction affecting the system were investigated by performing eigenvalue analysis and time response analysis. It is found that the reduction of the maximum peak magnitude by friction is decided according to designing the positions of pitch point and maximum peak in the responses.

• 한국기계기술학회지
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• 제13권4호
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• pp.137-141
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• 2011

Driving mechanism, the central part of a robot, was designed in this study. Power for the motive drive was acquired by directly connecting the motor shaft in worm shape of the low-end DC motor, car window motor, to a decelerator. The decelerator consists of a worm gear to receive power from the motor shaft, a pinion gear to be connected in line with the worm gear, and an output shaft to be engaged to the pinion gear. Motion driving is achieved by the power from the motor shaft with the designed gears, transferred to the deceleration mechanism and to the output gear.

• 한국군사과학기술학회지
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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

• 동력기계공학회지
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• 제12권3호
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• pp.38-43
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• 2008

The usage of electric forklift truck is gradually increasing due to the convenience at conveying and arranging the materials in the industrial field. In this study, the author designed and suggested the optimum driving system and load tester which both of them are the most important part of the forklift truck. The planetary gear is chose to driving system because it makes big power even though the motor size is small. The gear teeth of planetary gear were designed and the designed planetary gear was tested considering the yield strength and the abrasion of gear teeth. The B-Type electric brake which consists of multiple plates and operates with non-magnetic type was connected with a single shaft in the driving system. So, it can be applied at the sudden braking situation which has the torque increment. And it has the compact size and excellent durability Load tester can give the various levels of load to the planetary gear of driving system in the electric forklift truck and it can also measure the levels of the load which were applied. Therefore, we can measure the noise, torque and perform the durability, vibration tests using load tester. It will be economical because many kinds of test can be performed using reasonable priced load tester The driving system of electric forklift truck which has sufficient competitive can be manufactured using our designed planetary gear reducer with reasonable price. The designed load tester can use for checking the performance of other reducers, as well.

• 한국산학기술학회논문지
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• 제14권11호
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• pp.5392-5395
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• 2013

환자 및 노약자 이동에 중요한 역할을 하고 있는 수 전동휠체어의 핵심부인 구동부를 새롭게 설계했다. 구동부는 고속모터와 다단기어 치형을 설계적용하고, 굽힘강도와 면압강도를 고려해 큰 추진력을 얻을 수 있도록 성능을 검증하였다. B-Type의 마찰판식 클러치 전자식 브레이크(다판 방식의 무여자 작동형)를 동 축상에 설치해, 큰 토크에도 급격한 제동이 가능하도록 했다. 본 연구에 설계된 다단치차 감속기를 수 전동휠체어 구동장치에 사용하므로서, 소형화, 경량화를 이루고 구동 효율이 기존제품보다 30% 향상된 구동부를 구성할 수 있었으며, 보수 및 관리의 용이성을 함께 추구했다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 추계학술대회 논문집
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• pp.965-966
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• 2012

• 한국기계가공학회지
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• 제18권6호
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• pp.91-97
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• 2019

Rotating machining unit is a revolutionary product that can process worm shaft or spiral shaft with fast and precise, a rotary type cutting tool, which is attached to automatic lathe and processes spiral groove on outer circumference of round bar. In this work, a study on micro tooth shape modification method of driving gear train in the rotating machining unit was presented. To observe the effect on power transmission characteristics of the driving gear pair, visualize the gear meshing condition and the load distribution on the gear teeth by using the professional gear train analysis program RomaxDesigner. By comparing the repeated analysis results, the effect of micro tooth shape modification on power transmission characteristics on driving gear can be summarized. The optimized gears were fabricated and measured by precision tester as a validation in this research.

• 한국가스학회지
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• 제26권2호
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• pp.9-13
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• 2022

벨트나 체인을 이용한 감속기는 간단한 장치이긴 하지만 공간을 많이 차지하여 공간상의 제약이 있기 때문에 전동휠체어 구동부에는 부적합하다. 하지만 유성기어형태의 감속기는 동일 축에서 감속이 이루어지기 때문에 부피를 작게 할 수 있어 공간의 제약이 벨트나 체인형태의 감속기보다 덜하다. 따라서 본 연구에서는 수·전동전환이 가능한 휠체어의 구동부에 대한 연구를 통하여 유성기어형태를 이용한 감속기로 큰 추진력을 얻을 수 있는 구동부를 개발하였다. 그에 따라 감속기에 적용되는 유성기어의 치형을 Kisssoft 프로그램을 이용하여 설계를 진행하였다. 또한 기존 휠체어 바퀴에 적용 가능하도록 구동부의 설계를 진행하였고, 구동부의 수·전동 전환원리 및 작동원리에 대한 메커니즘의 최적화를 진행하였다. 연구내용을 토대로 하나의 선기어와 2개의 유성기어, 하나의 링기어를 갖는 유성기어 형태의 휠체어 감속기 구동부의 최종 설계 및 제작을 진행하였다.

• 한국기계가공학회지
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• 제8권2호
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• pp.32-39
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• 2009

This paper describes mathematical models of the torsional geared driving system for the indexing path and the mill driving path in a mill turret. The eigenvalue analysis for the models is conducted both with and without the gear contact stiffnesses. The natural frequency leads to the effect of gear contact stiffnesses on the vibration of torsional geared systems in a mill turret. It is necessary to analyze eigenvalues of the complex geared torsional system in order to prevent the unexpected vibrations.