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Differential gear case와 피니언 샤프트 체결을 위한 핀 압입 장치설계 및 측정에 관한 연구
장태환 ( T. H. Jang ),권진욱 ( J. U. Gwon ),엄지현 ( J. H. Eum ),김정아 ( J. A. Kim ),김태규 ( T. G. Kim ) 한국열처리공학회 2021 熱處理工學會誌 Vol.34 No.1
The differential gear system is a device designed to distribute the driving force of both vehicle wheels and control the rotational speed when the vehicle turns on a curve. The differential device consists of a differential gear case, a ring gear, and a pressure ring. A differential pinion gear and side gear are mounted on the differential pinion shaft inside the differential gear case. In this study, a pin press-fitting device that mounts the pinier gear and side gear to the differential pinion shaft in the differential gear case was designed, and a jig device for pin press-fitting using servo press was developed. In addition, by precisely measuring the pin press-in load and press-in distance according to the pin hole diameter of the differential gear shaft, the optimization of the pin pressin process was established. (Received January 7, 2021; Revised January 14, 2021; Accepted January 18, 2021)
자동차 Differential gear case 불평형 교정을 위한 balancing 장치설계 및 측정에 관한 연구
장태환,권진욱,엄지현,김정아,김태규,Jang, T.H.,Gwon, J.U.,Eum, J.H.,Kim, J.A.,Kim, T.G. 한국열처리공학회 2020 熱處理工學會誌 Vol.33 No.6
A vehicle's differential gear is a device designed to allow the vehicle's outer wheels to turn faster than the inner wheels when turning on a curve. The differential gear case is the main component of the differential gear system, which is composed of ring gear, pinion gear and side gear, and is fastened by pinion shaft pins. The differential gear case rotates when the vehicle is running, so balancing calibration is very important. In this study, a balancing machine that can diagnose and correct the differential gear case and mass imbalance of various rotating bodies was designed. The differential gear case was rotated at high speed to accurately diagnose the location and value of the unbalanced mass, and it was designed to be balanced and corrected by removing the unbalanced mass by drilling. After calibration, it was confirmed that the unbalanced value of all the measured samples was reduced to less than 180g.mm, and the unbalance reduction ratio was improved to 60~70%.
혈중 종양 세포 분리 Chip을 이용한 미세 유체 채널 내 입자 유동 연구
김정아(J.A. Kim),김태성(T.S. Kim),조치흠(C.H. Cho),허윤석(Y.S. Heo) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Circulating tumor cells (CTCs) present in the bloodstream of cancer patients. CTCs provide a potentially accessible source for detection, characterization, and monitoring of nonhematological cancers. We demonstrate the effectiveness of the CTC-Chip for the isolation of ovarian cancer cells by adapting the herringbone-chip (HB-Chip). The motion of the particles on the HB chip are simulated by a unique combination of buoyant, gravitational forces, and helical flows with computational modeling. The real motion of cells are demonstrated by applying polystylene bead and ovarian cancer cells into the microfabricated HB chip. The experimental results from beads and cells are well accordance with the simulated ones, as previous reported by Toner group. Thus, we expect that these modeling and experimental skills will play key roles in the clinical applications on CTC isolation as well as the basic research on characterization of CTCs under flow.