• Title/Summary/Keyword: pin bushing

검색결과 9건 처리시간 0.02초

내연기관용 무연 핀부싱의 마찰특성에 관한 실험적 연구 (Experimental Study on Friction Characteristics of Pb-free Pin Bushing for an Internal Combustion Engine)

  • 김청균;오경석
    • Tribology and Lubricants
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    • 제23권6호
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    • pp.306-311
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    • 2007
  • This paper presents the friction characteristics of pb-fres pin bushing bearings for an automotive gasoline engine. The external load is 100 N to 600 N and the speed of the pin bushing bearing is 1000 rpm to 3000 rpm against the rubbing surfaces. And the contact modes of rubbing surfaces between a piston pin and a pb-free pin bushing specimen are a dry friction, an oil lubricated friction and a mixed friction that is starved by a lack of engine oil. Two influential factors of a contact rubbing modes and a material property are very important parameters on the tribological performance of a friction characteristic between a piston pin and a pb-free pin bushing. The experimental result shows that the pin bushing speed of 2000 rpm shows a typical oil film lubricated sliding contact mode in which means that as the applied load is increased, the friction loss is increasing. But other contact mode depending on the speed and the load may affect to the fiction coefficient without a regular and uniform trend. In summary, the oil lubricated rubbing surface definitely decreases a running-in period in short and increase oil film stiffness, and this may leads the reduction of a friction loss.

자동차 엔진용 핀부싱 베어링의 SEM/EDX 이용 성분.결함분석에 관한 연구 (SEM/EDX Analysis on the Composition and Surface Defect in a Pin Bushing Bearing for an Automotive Engine)

  • 김청균
    • Tribology and Lubricants
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    • 제23권5호
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    • pp.195-200
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    • 2007
  • This paper presents the friction induced scuffing and wear defects analysis of a pin bushing bearing based on the chemical composition using a scanning microscopy (SEM) and an energy dispersive X-ray analyzer (EDX). The SEM/EDX system, which may provide good information on the surface thermal defects and chemical compositions, provides impurities such as an aluminum, a silicon, a ferrous component and an oxygen, especially. The EDX measured results show that the oxygen may reduce the strength and a hardness of a pin busing, which may lead to a scuffing and a seizure on the rubbing contact surface. The current technology fabricated by a sintering for a pin bushing bearing should be modified or changed to reduce the oxygen composition and the impurities in pin bushing materials.

엔진 파이어링동안 일정 축 각속도에서 비고정식 피스톤-핀과 연결봉-소단부 부싱 및 피스톤-핀 보스의 접촉면 마모해석 (Wear Analysis at the Interface of Connecting-Rod Small-End Bushing and Piston-Pin Boss with a Floating Piston-Pin at Constant Angular Velocity during Engine Firing)

  • 전상명
    • Tribology and Lubricants
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    • 제36권3호
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    • pp.168-192
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    • 2020
  • In recently designed diesel engines, the running conditions for piston-pin bearings have become severe because of the higher combustion pressure and increased temperature. Moreover, the metal removal from the bushing material has strongly reduced the ability of the antifriction material to accept asperity contacts. Therefore, it is necessary to find ways of reducing wear scar on the connecting-rod small-end bushing and piston-pin boss bearing related to the higher combustion pressure on the power cell of an engine. In this work, the position and level of material removal from the surfaces of the bushing and bearing under such severe operating conditions - for example, maximum power and torque conditions of a passenger car diesel engine - are estimated for several combinations of surface roughness. First, piston-pin rotating motion is investigated by calculating the friction coefficient at piston-pin bearings, the oil film thickness, and the frictional torques induced by hydrodynamic shear stress. Subsequently, the wear scarring on the surfaces of a connecting-rod small-end bushing and two piston-pin boss bearings related to piston-pin rotational motion is numerically calculated under the maximum power and torque operating conditions. This work is helpful to determine the reasonable surface roughness of the bushing and bearing for reducing wear volume occurring at the interface between a bearing and a shaft.

마찰조건에 따른 핀부싱 베어링의 접촉면압분포에 관한 연구 (Contact Pressure Distribution of Pin Bushing Bearings Depending on the Friction Conditions)

  • 김청균;김도현
    • Tribology and Lubricants
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    • 제23권6호
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    • pp.255-260
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    • 2007
  • This paper presents the contact pressure distribution of pin bushing bearings for various lubrication friction modes such as oil film and elastohydrodynamic lubrication contacts, a mixed lubrication contact, a boundary contact, and a dry contact. During a sliding contact of a plain bearing, the boundary and dry rubbing contacts are dominated between a piston pin and a pin bushing bearing. This may come from a micro-scale clearance, an explosive impact pressures from the piston head, and an oscillatory motion of a pin bearing. The computed results show that as the oil film parameter $h/{\sigma}$ is increased from the dry rubbing contact to the oil film lubrication friction, the maximum oil film pressure is radically increased due to an increased viscous friction with a thin oil film thickness and the maximum asperity contact pressure is reduced due to a decreased asperity contact of the rubbing surfaces.

고기동성 궤도차량용 복합재료 궤도 핀의 설계 (Design of Composite Track Pin for High Mobility Tracked Vehicles)

  • Lee, Dae-Gil;Park, Dong-Chang;Lee, Seung-Min;Kim, Hak-Sung
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2003년도 추계학술발표대회 논문집
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    • pp.163-166
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    • 2003
  • Since the track pin is subjected to large transverse track tension from the track link, conventional track pins for high mobility vehicles are usually made of high strength steel, which increases the weight of tracked vehicles due to the high density of steel. In this paper, several composite materials were employed for track pin design to reduce weight of track pin as well as to enhance the fatigue life of rubber bushings. Especially the effects of shear stiffness of the composites on the life of rubber bushing were investigated.

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스크롤 압축기에 적용된 가변반경 크랭크 기구의 동적 거동에 관한 연구 (Dynamic Behaviour of a Radial Compliant Crank Mechanism Used in Scroll Compressor)

  • 김태종;한동철
    • Tribology and Lubricants
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    • 제12권2호
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    • pp.8-19
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    • 1996
  • Scroll compressor using a slide bushing type radial compliant crank mechanism is modelled, and it's dynamic behaviour characteristics are analyzed. Sealing forces generated in the flank surfaces of the orbiting scroll depending on the distance, e, from slide bushing center to crank pin center are calculated. From the stable condition of orbiting scroll for the moment equilibrium in tangential direction, the range of e is determined as 0$r_o$. Transient response of a crankshaft supported by two journal bearings is investigated, considering applied load, moment, and unbalance force by eccentric mass. As a result, conical whirl mode with circular orbits are obtained. The characteristics of journal orbits and frictional losses are calculated with a variation of viscosity and bearing clearance.

풍력발전기용 3점 지지 기어박스의 토크암 핀 및 탄성중합체 부싱 설계 (Design of a Torque Arm Pin and Elastomeric Bushings for the Three-point-Suspension Gearbox of a Wind Turbine)

  • 심성보;남주석
    • 한국생산제조학회지
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    • 제26권2호
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    • pp.199-204
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    • 2017
  • In this study, analytical methods for designing a torque arm pin and elastomeric bushings of a conventional-type three-point-suspension gearbox of a wind turbine are investigated. The design loads for the torque arm were derived by considering the effects of the transmitted torque and self-weight of the gearbox. Based on the design loads, design methods for the torque arm pin and elastomeric bushings were introduced in the terms of material and size selection. Finally, a small-scale conventional-type gearbox was designed by applying the derived design methods. This study is an elementary and analytical study for the design of the torque arm pin and elastomeric bushings. It is necessary to verify and supplement the results further through extensive experimentation.

핀부시 베어링 소재의 계면접합특성에 관한 실험적 연구 (Experimental Study on the Interface Bonding Characteristics of a Pin-bushing Bearing)

  • 김청균;김도현
    • Tribology and Lubricants
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    • 제24권6호
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    • pp.315-319
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    • 2008
  • This paper presents the interface bonding characteristics between a phosphor bronze and a steel plate for pin-bush bearings. The pin-bush bearing is an important component in which is used to reduce a friction loss and a wear against the piston pin. The pin-bush bearing is manufactured by hot-pressing a phosphor bronze and a back metal of a steel plate. This paper investigated the bonding interface characteristics in which is manufactured by melting a copper based bronze and a steel plate. The hardness from the inner surface of a bronze to the outer one of steel has been measured using a Vickers hardness tester. The experimental results show that the hardness of a bronze is superior to that of the conventional bronze and the transient hardness of pin-bush bearings is gradually increasing to the hardness of the steel back metal. This means that the bonding interface zone of pin-bush bearings may be fabricated by defusing a bronze to the steel plate due to a density difference between two materials.

간극이 있는 링크기구의 동특성 (Dynamic Characteristics of Link Mechanism with Clearance)

  • 최연선;배성준
    • 소음진동
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    • 제9권5호
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    • pp.1050-1057
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    • 1999
  • The existence of clearance at the link joint of a machine is inevitable for assembly and mobility. During the cyclic operation of a machine, rapid changes of the direction and magnitude of connection forces cause momentary loss of contact between the pin and the bushing at the link joint. Contact loss at the clearance joint gives rise to undesirable impact. The impulsive force affects on the performance of the machine, and leads to excessive vibration, noise and faster wear in the connecitons. In this paper, experiment and theoretical analysis were carried out for the variation of crank speed and clearance size. The link mechanism employed in this investigation was newly designed to check the effects of parameter changes on the occurrence of contact loss and on the magnitude of the impact force. The contact loss and impact position were calculated with various driving conditions.

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