• 대한기계학회논문집
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• 제8권1호
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• pp.86-94
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• 1984

본 연구에서는 최신형 슬란트베드(slant-bed)타입의 중절삭용 NC선반주축을 대상으로 하여, 구동방식의 변경-기어변속장치를 주축으로부터 완전히 분리시키고 V벨 트에 의해 구동되는 후로팅방식의 새로운 주촉구조를 설계-을 통하여 고속에서의 주축 의 회전성능 향상을 시도하였고, 실험을 통하여 그 회전성능을 전형적인 3개의 서로 다른 재래식 선반주축모델들의 값과 비교 고찰하였다.

• 한국신뢰성학회지:신뢰성응용연구
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• 제12권3호
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• pp.201-213
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• 2012

A gear type lubrication pump is an essential component of the powertrain and has a major role for supplying oil to the gears and bearings in automatic transmission with a hydraulic clutch. Therefore, the durability test code design of lubrication pump is very important to ensure the reliability of the entire transmission and the vehicle. In this study, the design process for the life testing of lubrication pump has been generalized by four steps. The four design steps of the life testing of lubrication pump consist of the configuration of load spectrum, rain flow counting and analysis of load level, the equivalent damage assessment and test code generation. In fact, the load spectrum should be obtained from the field operating condition but that kind of data is the top secret of manufacturers. This is not open to the public in general. So we could use the artificially simulated load spectrum instead of field obtained one and focused on the development of the general process for designing the life test of a gear type lubrication pump. Reliability goals for lubrication pump, pressure, torque, temperature and load spectrum, if present, as appropriate for the given test conditions, accelerated life testing for the lubrication pump can be designed by the developed design steps.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2004년도 춘계학술대회 논문집
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• pp.87-90
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• 2004

In this paper, net-shape forming of an automobile gear is investigated. Barrel, a component of automobile start motor, is adopted as a net-shape forming. In order to accomplish the goal of net-shape forming without cutting of tooth and cam after forming, forming ability is raised through billet treatment and die design. As a technique of billet treatment spheroidizing annealing of billet to get low hardness and molybdenum disulphide coating to get low contact friction between billet and die is carried out. One of critical points of die design, fillet radii variation of tooth of die is applied to get smooth surface of barrel after cold forging. As a measurement of tooth accuracy, distance between two pins and lead-tooth alignments are investigated. Cam profile accuracy is checked with a 3D measuring instrument. Results obtained from the tests revealed reasonable result with respect to design goal. By these results, the paper shows that reasonable results can be obtained by billet treatment and die design for net-shape forming.

• 한국정밀공학회지
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• 제34권1호
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• pp.47-51
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• 2017

Generally, a working excavator has only one directional bucket tilting angle, which is up-forward. However, side direction rotation of the bucket would allow variety of working output. We designed a hydraulic rotary actuator comprising a double rod hydraulic cylinder with a rack-pinion gear set for use in excavator bucket with side tilting mechanism, thus converting the linear to angular motion. The proposed side tilting rotary actuator was designed with parts suitable for medium size of heavy duty excavator. These mechanical parts were inexpensive to purchase and the manufacturing cost was reasonable. The proposed mechanism is potentially useful for excavator with variety of working output.

• 한국CDE학회지
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• 제4권3호
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• pp.26-31
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• 1998

Recent trend of popularity of CAE(Computer Aided Engineering) tools and its availability, partly contributed by significant price reduction of H/W and SW, makes us believe CAE has already established terra firma as de jure tools, enablint the design improvement in the manufacturing am. However, if your jobs are required to be working closely with engineers located in the front line of manufacturing site, CAE is observed far from popularity, still being regarded as exclusive tools for engineers holding advanced degrees. Conventional methodologies depending on knowledge that was accumulated thorough trial and errors, depending primarily on engineering tables and formulas or proprietary know-how, are preferred as the de factor standard under the roof of contemporary development shops. Samsung camera, having stared its business since early 、80, has accumulated enough technological strength to compete in the world market. As today's consumers demand more sophisticated featured-lighter weight, built-in multi zoom and miniature size fitting in the palm-from camera manufacturer, so should Samsung camera respond to ever-delicate consumer's needs with great flexibility. Consequently conventional designers, without sophisticated analytical tools, with encounter solving the critical design factors that have never been treated as seriousness-marginal safety factors induced by reduced size of parts. In the study, CAE results of boss and gears were demonstrated as examples, which confirms the facts that the simple analysis done by front line designers, can bring distinguishable effects on the potential improvements of design and on the consequential influences on the future design process-simulation before actual tooling and productions.

• 한국소음진동공학회논문집
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• 제26권3호
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• pp.308-314
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• 2016

This paper proposes design guidances for noise reduction of a bank teller cash recycler(TCR). The operating noise of a TCR is required to be reduced because it bothers bank tellers and customers. The operating noise from a TCR is measured and the most influential driving system is examined. To find the main sources of the noise, the frequency spectra are analyzed by comparing with excitation frequencies of the driving system. From the analysis results, we reveals that the main sources of the noise are gear mesh frequency of a certain gear train and its side band frequencies, which is attributed by vulnerable support condition. Consequently, to reduce the operating noise, the structural modification for the gear train support is suggested and its effectiveness for the noise reduction is confirmed experimentally.

• 전력전자학회논문지
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• 제15권6호
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• pp.487-497
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• 2010

본 논문에서는 직렬형 하이브리드 자동차의 운전특성을 분석하기 위한 PSIM 시뮬레이터의 개발에 대하여 기술한다. 직렬형 하이브리드 자동차는 엔진이 전동기와 전기적으로 결합되어 있으며 전동기의 출력에 의해서만 구동된다. 엔진/발전기, 전동기, 기어와 같은 파워트레인 각 구성요소들의 정격은 에너지 개념을 이용한 시스템과 Electrical Peaking Hybrid (ELPH)를 이용하여 모델링할 수 있는데, 설계된 하이브리드 자동차를 개발된 PSIM 시뮬레이터를 이용하여 특정 운전주기 하에서 평가하고 분석하였다. 기계적 제동이 사용되는 경우와 회생제동이 사용되는 경우 각각에 대하여 전동기의 평균 입력을 비교하였으며 시뮬레이션 결과를 바탕으로 직렬형 하이브리드 자동차의 연비를 분석하였다.

• 한국산학기술학회논문지
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• 제9권6호
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• pp.1529-1534
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• 2008

최근, 교반기는 화학물질의 교반 및 탈포를 위해 디스플레이, 반도체 업체에서 광범위하게 사용되고 있다. 교반기는 일반적으로 축, 교반조, 감속기어 및 구동 모터로 구성되어 있다. 교반기 설계시의 주요 사항은 회전시의 동적 특성을 평가하는 것이다. 회전시의 동적특성은 진동, 소음 및 열방출로 나타난다. 본 논문은 고속 교반기의 동적 특성을 실험적으로 규명하였다. 진동을 유발하는 주 인자는 회전체의 불균형에 기인한 것임을 알 수 있었으며, 교반 용기 부위의 온도가 전체온도에서 상대적으로 제일 높음을 알 수 있었다.

• 센서학회지
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• 제7권4호
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• pp.225-233
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• 1998

$150^{\circ}C$정도의 높은 온도를 갖는 경우와 같은 열악한 환경 조건하에서의 기어 톱니의 회전수 검출을 위한 센서의 원리, 설계, 응용에 대하여 연구하였다. 톱니 바퀴의 회전의 검출을 위해 바이폴라 실리콘 공정에 의하여 SIMOX 기판위에 한 쌍의 Hall 소자들을 제조하여 차동검출방식을 사용하였다. 제작된 고온용 Hall 소자는 $-40^{\circ}C{\sim}150^{\circ}C$의 넓은 온도 영역을 지니며 동작영역에서의 적감도는 약 510 V/AT이었다. 차동 Hall 소자는 단일 Hall 소자를 사용할 때보다 넓은 온도 영역에 걸쳐 센서와 톱니 바퀴사이의 가능한 최대 거리를 보다 넓게 만들어 주었으며 최대 검출거리는 4mA 의 구동전류에서 약 4.5mm이었다.

• 대한안전경영과학회지
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• 제20권4호
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• pp.1-6
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• 2018

Recently, bicycle has means of effective healthy transportation, and riding the bicycles is considered as popular recreational and sporting activities. Also, the saddle, steering system, driving device and braking device are researched briskly because of consumer's need for driving performance and comfort. Especially, the importance of a cassette responsible for transmission function by transmitting power to the drive shaft through the chain is very focused. The writer conducted structural analysis for the sprocket of each level using the ANSYS widely used for the analysis. Speed shifting performance was enhanced by minimization / simplification of shifting point through a sort of tooth profile of the cassette. By partitioning a clear value type and other shifting point, it has been modified to enable smooth speed-shifting. In addition, as titanium precision forming process, this study studied the molding technique by blanking and dies forging for mass production of the cassette. so it could be expected that the entire drive train would utilize that in the future. The stamping process capability for thin materials for the mass production of the sprockets is applicable to producing automobile parts, so lightweight component production is likely to be possible through that, for the safety of driving.