• Title/Summary/Keyword: 치형형상

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Optimal Design of Gerotor with Combined Profiles (Three-Ellipse and Ellipse-Involute-Ellipse) Using Rotation and Translation Algorithm (회전이동 및 병진이동 알고리즘을 이용한 조합된 치형형상(3-타원 및 타원-인벌루트-타원)을 갖는 지로터의 최적설계)

  • Bae, Jun Ho;Lee, Ho Ryul;Kim, Chul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.2
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    • pp.169-177
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    • 2015
  • Because technology of the sintering process is highly advanced, the gerotor used in the internal gear pumps of vehicles has advantages for manufacturing complex profiles and obtaining durability and minimization. However, it has been necessary to continuously improve the flow rate and noise of internal gear pumps for better fuel efficiency. The existing rotor was designed using a translation algorithm. This caused a discontinuity of the rotor profile, which had adverse effects on the performance. In this study, to improve the discontinuity of the profile, a new design program using a rotation and translation algorithm was developed, and two types of combined multiple profiles (three-ellipses and ellipse 1-involute-ellipse 2) were generated. Then, the performances (flow, flow rate, specific sliding, and pressure angle) of these profiles were calculated. On the basis of the calculation results for the performances, optimal designs of the two types were carried out and verified by comparing their performances with those of the existing rotor profiles.

A study on performance analysis of screw rotor profiles (스크류 로터 치형의 성능해석에 관한 연구)

  • 박세정;최상훈
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1993.10a
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    • pp.627-631
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    • 1993
  • 스크류 압축기는 진동이 적고, 소형이면서 고효율을 유지하기가 용이하다는 특징을 가지고 있으며, 원통형 밀패용기 내에 암,수로터가 서로 반대 방향으로 맞물려 회전하면서, 로터홈과 케이싱 사이에 생기는 공간의 용적이 로터회전에 의해서 가스를 흡입, 압축, 배출하는 합축기 이다. 본 연구는 로터의 치형 함수의 기하학적성질 및 제한사항을 고려하여, 대칭 치형을 치수의 조합과, 원, 점, 직선, 타원을 사용하여 비대칭 치형을 설계하였다. 본 연구의 목적은 설계된 치형과 기존의 치형을 치형 형상의 변화에 따른 특성값 (실라인길이, 누설삼각형, 용적곡선, 흡입 및 토출 홈면적)의 변화에 대하여 연구함으로서 성능검토를 시도하였다.

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Optimal Design of Rotor Profile of Internal Gear Pump for Noise Reduction (내접형 기어펌프용 로터의 소음저감을 위한 치형 최적설계)

  • Bae, Jun Ho;Bae, Won Byong;Joo, Ung Tak;Kim, Chul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.3
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    • pp.295-302
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    • 2014
  • An internal gear pump is required to improve the flow rate and noise. Furthermore, such pumps are durable and small in size. In this study, equations of the rotor shape with multiple profiles (ellipse 1-involute-ellipse 2) were derived, and relevant performance parameters (pressure angle, irregularity, and specific sliding) of the internal gear pump to noise were predicted and compared. Rotor profiles and performance parameters were obtained by a prediction algorithm for theoretical analysis, and the effects between the design parameters and the performance parameters were analyzed. Based on the analysis results of the effects, an optimal design of the rotor profile was proposed, and a noise test of the prototype was performed to evaluate the reliability of the design.

Screw 치형의 특성값에 관한 연구

  • 오형식;최상훈
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1993.04b
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    • pp.146-150
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    • 1993
  • screw압축기는 진동이 적고, 소형이면도 그효율 유지가 용이하다는 특징을 가지고있으며, 왕복압축기와 같은 crank가 없고 원통형 밀폐용기 내에 암,수 로타가 서로 반대 방향으로 맞물려 회전하면서 로타홈과 케이싱 사이에 생기는 공간의 용적이 로타의 회전에 의해서 가스를 연속적으로 흡입, 압축, 배출하는 용적형압축기이다. 본 연구는 screw 압축기의 성능에 큰 영향을 미치는 로타의 치형함수의 기하학적성질 및 제한사항을 서술하였고, 로타의 형상이 특성값에 미치는 영향을 이론적으로 해석 하기 위하여, 임의의 치형을 갖는 로타를 만들고, 이것과 맞물리는 상대로타의 치형을 설계하여 seal line length와 blow hole area을 계산하였다.

Optimal Design of Gerotor with Combined Lobe Profiles (Ellipse 1-Elliptical Involute-Ellipse 2) (타원 1-타원형 인벌루트-타원 2 로브 형상의 제로터 최적 설계)

  • Kwak, Hyo Seo;Li, Sheng Huan;Kim, Chul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.12
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    • pp.1237-1244
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    • 2015
  • A gerotor can be manufactured in a miniature size because it has a high discharge per cycle and a simple structure. Gerotors are widely used for the lubrication oil of an engine and as the hydraulic source of an automatic transmission. Recently, improvements in fuel efficiency and noise reduction have come to the fore in the automobile industry, and it has been necessary for better fuel efficiency to continuously improve the flow rate and noise of internal gear pumps through the optimal design of the gerotor and port shape. In this study, gerotors were generated based on the equations derived for a lobe shape with multiple profiles (ellipse 1-elliptical involute-ellipse 2). The ranges of the design parameters were considered to prevent a cusp and loop. In addition, the optimal lobe shape was obtained by determining the influence of the lobe shape on the performances (flow rate, irregularity, etc.), according to the values of the design parameters.

Optimum Design of Teeth Shapes of Rotating Serration and Spline-type Torque Converter Parts Operating in a High Temperature Fluids (고온에서 맞물려 회전하는 토크컨버터 부품간 열 및 토크를 고려한 치형상의 최적설계)

  • Lee, Dong-uk;Kim, Cheol;Kim, Jungjun;Shin, Sooncheol
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.41 no.11
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    • pp.1125-1130
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    • 2017
  • The tooth shapes of serration-type and spline-type reactors are optimized using finite element methods to improve the working life of the part and to lower the stress concentration during rotation resulting from contact with the outer race for a reactor operating with $170^{\circ}C$ transmission oil. The results of thermal expansion analyses between an Al reactor and the steel outer race indicate that, before optimization, the gap between the two parts increases further as the serration-type reactor expands by 0.1 mm and the spline-type one strains by 0.08 mm. Because of shape optimization, a trapezoidal shape is obtained from the initial triangular serration and the rectangular spline of the two reactors. The maximum von Mises stress of the serration-type convertor decreased by 24.5 %, and by 9.3 % for the spline-type convertor. In addition, there is a 13 % reduction in the axial thickness, as compared to the initially designed model.

Contact Fatigue Life for CRG System (CRG 시스템의 접촉 피로수명)

  • Nam, Hyoung-Chul;Kim, Chang-Hyun;Kwon, Soon-Man
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.11
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    • pp.1391-1397
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    • 2012
  • A cam ring gear (CRG) system based on a hypotrochoid curve consists of a pinion with roller teeth and its conjugated internal CRG. In this study, we investigated contact forces, contact stresses, and load stress factors to predict the surface pitting life using an exact CRG profile by introducing the profile modification coefficient. The results show that the pitting life can be extended significantly by increasing the profile modification coefficient without any other change of parameters in the CRG system.

CAD Optimisation of The Planocentric Gears From EHL(elasto-hydrodynamic lubrication) Concept (EHL 개념을 도입한 PLANOCENTRIC GEATS 장치의 설계 최적화)

  • 권오관;이성철;김이범
    • Tribology and Lubricants
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    • v.1 no.1
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    • pp.69-79
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    • 1985
  • EHD(elastohydrodynamic) lubrication theories are applied to analyse the contact characteristies between the circular are profiled teeth of the plano-wheel gear and the cylindrical pin type teeth of the inner gear for the planocentric gears unit, For improving lubrication characteristic and contact frictional interference between the teeth, a new design method of optimising continuous meshing position is introduced, and the new tooth profile which is modified as a rounded curvature of the edge of circular arc is also suggested. The results of mathematical computation from conventional and the modified gear unit are compared, respectively.

A Study on the Helical Gear Forming by Cold Extrusion (냉간 압출에 의한 헬리컬 기어의 제조에 관한 연구)

  • 최재찬;조해용;권혁홍;한진철
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.15 no.1
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    • pp.127-138
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    • 1991
  • A gear forming method by cold extrusion and an analytical method with its numerical solution program based on the upper bound method were developed. In the analysis the involute curve was as a shape of die and the upper bound method was used to calculate energy dissipation rate. By this method the power requirement and optimum conditions necessary for extruding helical(spur) gear were successfully calculated. These numerical solutions are in good agreement with experimental data. In the experiment, 4-6 class helical gear of KS standard for automobile transmission was successfully manufactured.