• Title/Summary/Keyword: Roller housing

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A study on shearing die design for window roller housing and die manufacture (창호용 롤러 하우징의 전단금형 설계 및 제작에 관한 연구)

  • Kim, Sei-hwan;Choi, Kye-kwang
    • Design & Manufacturing
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    • v.8 no.1
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    • pp.35-39
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    • 2014
  • Window roller housings are durable because high-quality source materials such as stainless steel is used in making them. After a series of precise structure analysis, their design is optimized. They are subject to repetitive driving tests of more 100,000 times, durability tests, impact resistance tests, corrosion tests and others. For a long time, gaps often occur in press molded products owing to serious squareness deformation and flatness deformation of them. Severe burrs in press molded products require frequent grinding, which leads to short life cycle and rough or unreliable movement of assembled roller housing, which, in turn, causes product defects. This study focuses on developing measures to resolve existing defects and to improve lifespan of dies by designing and making a window roller shearing die.

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A Study on Contact Force Analysis of Plate Gears for Cycloidal Speed Reducer with Friction Effect (마찰효과를 고려한 사이클로이드 감속기의 작용력 해석에 관한 연구)

  • 홍진표;신중호;권순만;장세원
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.1262-1265
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    • 2004
  • A cycloidal speed reducer is a type of the speed reducers of machinery. The cycloidal speed reducer consists of two cycloidal plate gears, housing roller gear, input shaft, output pin and shaft, and eccentric bearings. Especially the cycloidal plate gear has the peculiar parts of the teeth, because of gearing with the housing roller gear that has the several rollers on the circular line. And then all teeth on the cycloidal plate gear can be designed to contact with the rollers on the housing roller gear at the same time. Therefore the cycloidal plate gear has always contact motion with rollers and the force is interacted between roller gear with cycloidal plate gear. Because the contact force and friction force must be required to improve the accuracy in design procedures of cycloidal speed reducers, this paper presents a force analysis considered friction effect approach derived by static force equilibrium condition, geometrical adaptation, instant velocity center method and relative velocity method.

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Finite Element Analysis of the Robot Roller Hemming (로봇 롤러 헤밍의 유한요소해석)

  • Chu, Seok-Jae;Kang, Min-Jun
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.475-480
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    • 2008
  • Hemming, especially curl hemming, is required along the wheel housing for safety. Robot roller hemming is suitable for it. In this paper, both the flat hemming and the curl hemming along either the straight profile or the curved profile are analyzed using finite element program MSC.Marc to verify the hemming test results. Both the inner panel and the outer panel are modeled using 3-D solid elements and the roler is modeled using rigid surface. In the curl hemming, there is a case that the curl is not formed if the pre-hemming force is not sufficient. It agrees with the test results.

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Production Process Development and Prototype Evaluation for Roller Tappet Housing of Valvetrain (밸브트레인용 롤러태핏 하우징의 제작 공정 개발 및 시제품 평가)

  • Gwak, Eun-Jo;Park, Sung-Young
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.11
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    • pp.223-229
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    • 2016
  • In this study, a cold forging process was developed for the roller tappet housing of an engine valvetrain system. A tappet sample was manufactured and subjected to an endurance test. The material properties were obtained from a compression test, and forging analysis was carried out to design a forging process using a commercial program, Deform-3D. The forging process was set up based on the analysis results, and a die set and sample tappet housing were manufactured. To evaluate the sample, the dimensional accuracy, surface roughness, parallelism, and concentricity were measured and confirmed. To evaluate the actuation and durability, a special test rig was developed to simulate the valvetrain system of the engine. An actuation test was performed based on the idle speed of a general diesel engine, and an endurance test was done based on the maximum speed. The results show minor wear of 0.002 mm. The developed test rig will be used to evaluate the actuation and durability of other valvetrain parts.

Development of rotary vane air blower for fuel cell (연료전지용 로터리 베인 공기 블로워 개발)

  • Ju, Byeong-Soo;Sim, Jae-Hwi;Seo, Sek-Ho;Oh, Si-Doek
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.2429-2433
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    • 2008
  • A rotary vane blower was developed as an air supply system for fuel cell application. As one way of improving the blower efficiency, a roller was adapted between vanes and cylinder housing. The performance of blower was investigated experimentally. The blower power input was about 115W to compress the air at normal atmospheric condition to 0.2 bar with the flow rate of 140 NLPM, resulting in the blower overall efficiency of 43%. After 400 hours of operation, the performance of blower was not changed. The result showed that developed blower was confirmed to be suitable for fuel cell application.

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Analytical Study on the Performance of a Rotary Vane Compressor (로타리 베인 공기압축기의 성능에 관한 수치해석)

  • Kim Hyun-Jin;Nam Bo-Young;Lee Gyeong-Yong
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.18 no.4
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    • pp.351-358
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    • 2006
  • This paper presents analytical results of a rotary vane compressor performance when the compressor is used for air supply from underwater. Compression characteristics such as pressure and temperature in a compression chamber are analyzed. Volumetric and adiabatic efficiencies are calculated. Vane dynamics are also performed to give reaction forces on the vane from the cylinder inner surface and from vane slots. Compressor efficiency is about 34.9%, and about 55% of the compressor loss is produced by the friction between the vane nose and the cylinder wall. Volumetric efficiency is about 79.5%, and indicated efficiency is about 77.1%, which are comparable to other displacement type compressors. When roller was introduced between housing inner wall and vane tips, mechanical efficiency could be improved by as much as 24.9%, depending on the roller friction.

An Experimental Study on the Reduction Effects of Shading Devices on Sky Radiant Cooling in Winter (차양장치의 겨울철 천공복사 냉각 저감 효과에 관한 실험적 연구)

  • Kim, Jin-Hee;Kim, Young-Tag;Lee, Soo-Yeol;Choi, Won-Ki
    • Land and Housing Review
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    • v.12 no.1
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    • pp.129-137
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    • 2021
  • External shading devices are well known solar control devices that can help reduce the cooling load of commercial buildings. For this study, experiments were conducted to examine the feasibility of shading devices in reducing both the cooling and heating loads. The influence of sky radiant cooling during winter was verified for the external shading device, internal roller blind, and window. Results can be summarized as follows. The temperature difference between the inner and outer surfaces of the window with the external shading device was 11.8℃ compared to 14.6℃ for one without the external shading device. This 2.8℃ difference was due to heat exchange by sky radiation when the surface temperature of the shading device was lower than the ambient outdoor air temperature. The roller blind resulted in a lower temperature of 0.8℃ compared to the average temperature of the window's air cavity. This was due to heat exchange by sky radiation of the roller blind surfaces. Without shading devices, the outside surface temperature of the window is about 3℃ higher. The study also found that when external shading devices were installed on both the southwest and southeast sides, the outside surface temperature of the windows were lower on the southwest side than the southeast side.

A Study on the Thermal Behavior of Bearing Surroundings using State-Space in Machine Tool Spindle System (공작기계 스핀들시스템에서 상태공간을 이용한 베어링 주변의 열거동에 대한 연구)

  • 신동수;정성종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.1045-1049
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    • 1995
  • This paper proposes the state-space model of the thermal behavior of the spindle system to establish dynamic mathematical model of thermal characteristics in machine tool spindle system. the model is derived form physical law of heat transfer and thermoelasticity and represents the thermal behavior induced by uneven thermal expansions whitin a bearing. The model, which is sucessfully validated for two typical configurations of high speed spindle assembles, provides a tool for understanding the basis mechanics of induced thermal expansion as a function of initial preload, spindle speed and housing cooling conditions.

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Analysis of Fluid Flow Characteristics Around Rolling Element in Ball Bearings (볼 베어링의 구름 요소 주위 유동 특성에 대한 해석)

  • Jo, Jun Hyeon;Kim, Choong Hyun
    • Tribology and Lubricants
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    • v.28 no.6
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    • pp.278-282
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    • 2012
  • Various bearings such as deep-groove ball bearings, angular-contact ball bearings, and roller bearings are used to support the load and to lubricate between the shaft and the housing. The bearings of potential rolling systems in a turbo pump are the deep-groove ball bearings as comparing with the bearings with rolling elements such as cylindrical rollers, tapered cylindrical rollers, and needle rollers. The deep-groove ball bearings consist of rolling elements, an inner raceway, an outer raceway and a retainer that maintain separation and help to lubricate the rolling element that is rotating in the raceways. In the case of water-lubricated ball bearings, however, fluid friction between the ball and raceways is affected by the entry direction of flow, rotation speed, and flow rate. In addition, this friction is the key factor affecting the bearing life cycles and reliability. In this paper, the characteristics of flow conditions corresponding to a deep-groove ball bearing are investigated numerically, with particular focus on the friction distribution on the rolling element, in order to extend the analysis to the area that experiences solid friction. A simple analysis model of fluid flow inside the water-lubricated ball bearing is analyzed with CFD, and the flow characteristics at high rotation speeds are presented.