• 제목/요약/키워드: Involute

검색결과 160건 처리시간 0.03초

연비개선 및 소음저감을 위한 지로터 최적설계 (타원 1-타원형 인벌루트-타원2) (Optimal Design of Gerotor (Ellipse1-Elliptical Involute-Ellipse2 Combined Lobe Shape) for Improving Fuel Efficiency and Reducing Noise)

  • 곽효서;이승환;김철
    • 한국정밀공학회지
    • /
    • 제33권11호
    • /
    • pp.927-935
    • /
    • 2016
  • A gerotor is suitable for miniature manufacturing because it has a high discharge per cycle and a simple structure, while also being widely used as lubrication oil of engines and the hydraulic source of automatic transmission. In the automobile industry, it has been necessary to continuously improve the flow rate and noise of internal gear pumps for better fuel efficiency through optimal gerotor design. In this study, to obtain an optimal gerotor with an ellipse-elliptical involute-ellipse combined lobe shape, an automatic program was developed for calculating performance parameters and drawing a gerotor profile. An oil pump was assembled with the optimal gerotor together with the port used at the actual field and CFD analysis was performed on this assembly using Ansys-CFX. A performance test for the oil pump was carried out and showed good agreement with the results obtained from the theoretical analysis and the CFD analysis.

컴퓨터를 이용한 동력전달용 인벌류우트 원통치차의 설계 (Computer-Aided Design of Involute Cylindrical Gears for Power Transmission)

  • 정태형;김민수
    • 대한기계학회논문집
    • /
    • 제14권3호
    • /
    • pp.594-602
    • /
    • 1990
  • 본 연구에서는 동력전달용 인벌류우트 원통치차(스퍼어 및 헬리컬 기어)의 강 도 및 각종 영향인자를 충분히 고려하면서 크기를 최소로 하는 치차장치의 설계법을 개발하고, 이 설계법을 기본으로 하여 퍼스널 컴퓨터 상에서 누구나 손쉽게 설계에 이 용할 수 있는 설계 시스템을 개발하여 그 평가를 수행한다.

상계해법에 의한 원형빌렛으로부터 인볼루트 헬리컬핀을 가진 제품의 비틀림 압출가공법에 관한 연구 (A Study of the Twisting and Extrusion Process of the Product with Involute Helical Fin from the Round Billet by the Upper Bound Analysis)

  • 박대윤;진인태
    • 소성∙가공
    • /
    • 제10권4호
    • /
    • pp.302-310
    • /
    • 2001
  • The twisting and extrusion process of the product with involute helical fin from the round billet is developed by the upper bound analysis. The twisting of extruded product is caused by the twisted inclined die surface connecting the die enterance section and the die exit section linearly. In the analysis, the internal shear surface is defined as the curved twisted plane from the twisting of die surface and the shear work is calculated by the consumption of shear energy. The increase rate of angular velocity is determined by the minimization of plastic work. The angular velocity of die exit can be controlled by the land length and the length of inclined die. The alular velocity assums to be increased linearly by the axial distance from the die enterance to the die exit. The results of the analysis show that the angular velocity of the extruded product increases with the die twisting angle, the reduction of area, and decreases with the die length, the friction constant.

  • PDF

3차원 유한요소해석을 이용한 스크롤 로터의 단조 금형 설계 (The Forging Die Design of Scroll Rotor by using the 3-D FEM Analysis)

  • 이영선;이정환
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2001년도 춘계학술대회논문집C
    • /
    • pp.111-115
    • /
    • 2001
  • The die design for hot forging was investigated for manufacturing precisely of scroll rotor made with Al-Si alloy. A scroll rotor is a non-symmetric 3-D shape part, having involute wraps. Disk-shaped billet of Al-Si alloy was extruded to wraps and boss simultaneously. Because the involute wraps is not axi-symmetric, the flow velocity and the stress of die is very much different at each portion. Moreover, the die in wraps portion is a cantilever beam and fractured. In this paper, the analysis of forming and die stress is investigated using the FEM tool, DEFORM-3D. The tensile strength of tool material is $250kg/mm^{2}$. From the analysis results, we can find the maximum principal stress of die is over the fracture strength and redesign the die. The prototype forged part is superior in net shaping and microstructure.

  • PDF

스퍼기어의 치형수정 프로그램의 개발 (A Development of Tooth Profile Modification for Spur Gear)

  • 황진영;황성욱;김태완;조용주
    • 한국윤활학회:학술대회논문집
    • /
    • 한국윤활학회 2002년도 제35회 춘계학술대회
    • /
    • pp.259-266
    • /
    • 2002
  • The basic concept of 'tooth profile modification' is to change a part of the involute profile to reduce the load in that area and appropriate profile modifications can help gears to run quietly and resist scoring, pitting and tooth breakage. In this study, the modification of tooth profile to make a smooth transmission of the normal loads in spur gears has been developed. The modified tooth profile has been determined by the total deflection at contact points. We use the AGMA Standard to design basic gear profile, We also developed a gear design Program using tooth profile modification

  • PDF

타원형 기어의 와이어커팅을 위한 설계 (Design of Elliptical Gears for Wire Cutting)

  • 이성철
    • Tribology and Lubricants
    • /
    • 제23권4호
    • /
    • pp.149-155
    • /
    • 2007
  • The CAD model of a elliptical gear for wire cutting has been developed. The rolling contact of pitch ellipses whose rotation axes coincide with their focus has been analyzed, and the perimeter of the pitch ellipse has been divided into equal-length segments by the number of teeth. A master tooth profile, which is a composite curve of circular arcs that represents involute, has been introduced. The elliptical gear has been designed by imposing the master tooth on the divided points of the pitch ellipse, and a full fillet has been achieved between neighbour teeth. Thus, the whole profile of an elliptical gear is a composite curve of arcs only, and consequently NC codes for wire cutting can be easily generated. Furthermore, a computer simulation program is developed to verify the mesh of the elliptical gear.

ZK 웜과 인볼류트 헬리컬기어로 결합된 CVVL용 웜기어 설계 (Design of Worm Gear for CVVL Paired with ZK Worm and Involute Helical Gear)

  • 손종현;박노길;오정한
    • 한국자동차공학회논문집
    • /
    • 제22권1호
    • /
    • pp.77-84
    • /
    • 2014
  • The worm gear is used in the motor drive system of automotive CVVL because of its compactness and self-locking ability. A ZK worm and an involute helical gear can be meshed in order to reduce production cost. However, the gearing is not suitable for the reliability and the NVH problem. To improve the dynamic performances, an optimal design process is considered. The transmission error is calculated theoretically and minimized with the several gear design parameters. An inequality condition such as the teeth interference elimination is added.

타원계 엽형기어의 설계 및 동특성에 관한 연구 (Design of Elliptical Lobe Type Gear with Involute Profile)

  • 유명섭
    • 한국정밀공학회지
    • /
    • 제15권4호
    • /
    • pp.7-14
    • /
    • 1998
  • Noncircular gears have been used for obtaining the modified anglualr velocity ratio between parallel axes. The elliptical gear, which is a kind of noncircular gears, makes use of ellipse as a pitch curve, and is applied for the measurement of the discharge of liquid. The applications of an elliptical gear are more advantageous than any other mechanism as like a crank-slider linkage or a cam mechanism in view of the accuracy and the reliability to transmit the prescribed motion. In this paper, acceding to the theoretical involute tooth profile, two pairs of the elliptical gears were manufactured by using CNC wire electronic discharge machine. The proper ranges of the operating pressure angle and of module not to generate under cutting are studied on the change of the eccentricity, because it is the eccentricity of the pitch curve that determines most of the characteristics of the elliptical gear and then the vibration analysis is executed for the verification of harmonious rotating.

  • PDF

내부에 세레이션홈이 존재하는 원통형 제품의 단조에 관한 연구 (A Study on the Forging of Cylindrical Parts with Internal Serrations)

  • Park, J.C.;Cho, H.Y.;Min, G.S.
    • 한국정밀공학회지
    • /
    • 제14권6호
    • /
    • pp.142-148
    • /
    • 1997
  • In this paper, forging of internal triangular and involute serrations are analyzed by upper bound method. Kinematically admissible velocity fields for half pitch of the serration were proposed. It was assumed that the shape flow surface during forging is a straight line perpendicular to plane of symmetry. Using the suggested velocity fields, forging loads and relative pressures were calculated by numerical method. Experiments were carride out with commercial AI 2024 aluminium alloy. As a result, the calculated solutions are good agreement with experimental results, so it is useful to predict the loads for forging of internal serrations.

  • PDF

치형수정 기술을 이용한 스퍼기어설계 소프트웨어의 개발 (Development of Spur Gear Design Software using Tooth Profile Modification)

  • 김태완;황진영;조용주
    • 한국정밀공학회지
    • /
    • 제19권10호
    • /
    • pp.202-211
    • /
    • 2002
  • The basic concept of 'tooth profile modification' to change a part of the involute profile to reduce the load in that area and appropriate profile modifications can help gears to run quietly and resist scoring, pitting and tooth breakage. In this study, the modification of tooth profile to make a smooth transmission of the normal loads in spur gears has been developed. The modified tooth profile has been determined by the total deflection at contact points. We use the AGMA Standard to design basic gear profile. We also developed a gear design program using tooth profile modification.