• Title/Summary/Keyword: Tooth profile

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Analysis of Tooth Strength and Cutter Tooth Profile in Harmonic Drive Reducer (조속식 감속기의 치 강도 및 커터치형 해석)

  • 전완주;오박균
    • Tribology and Lubricants
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    • v.5 no.2
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    • pp.107-112
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    • 1989
  • This paper deals with strength analysis of tooth and method of manufacture of external tooth profile in harmonic drive. From the calculation of load imposed on the contact teeth, moximum contact stress is investigated to design the addendum modification coefficient. New tooth profile of the external gear is generated according to the law of gearing, assuming that internal gear has involute tooth profile. External tooth profile can't be manufactured by conventional exclusive tools which have pressure angle of 20$\circ$. The method to design cutter tooth profile is presented.

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

  • Hwang, Jin-Young;Hwang, Sung-Wook;Kim, Tae-Wan;Cho, Yong-Joo
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2002.05a
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    • pp.259-266
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    • 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

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

  • Kim, Tae-Wan;Hwang, Jin-Yeong;Jo, Yong-Ju
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.10
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    • pp.202-211
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    • 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.

Mechanical characteristics of involute-circular arc composite tooth profile (인벌류우트-圓弧 合成齒形의 諸特性)

  • 변준형;최상훈;윤갑영
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.10 no.6
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    • pp.870-875
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    • 1986
  • In this study, full-rounded tip curve of rack and its mating fillet curve of pinion in Involute-circular arc composite tooth profile are derived. Mechanical characteristics are calculated analytically, i.e., Specific sliding, Nominal bending stress at working root circle and the Contact factor of the arc of contact in circular arc part to the arc of double contact. These characteristics compared with standard involute tooth profile are improved in circular arc part of composite tooth profile. To obtain more efficient composite tooth profile, we studied these characteristics with regard to the changes of unwound angle and radius of circualr arc. And a design method of composite tooth profile is suggested. Composite tooth profile are compared with standard involute tooth profile.

A Study of Spur Gear Tooth Profile Modiscation Scheme for ScufEng Resistance Improvement (평기어의 스커핑 강도향상을 위한 치형수정 기술의 연구)

  • 김태완;황진영;조용주
    • Tribology and Lubricants
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    • v.18 no.6
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    • pp.418-424
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    • 2002
  • The basic concept of ‘gear 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 also compared our results with other experimental results.

A Study on Correction of the Gear Tooth Profile Error by Finish Roll Forming (전조가공을 이용한 기어의 치형오차수정에 관한 연구)

  • Lyu Sung-Ki;Uematsu Seizo
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.4
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    • pp.159-166
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    • 2005
  • This study deals with the correction of gear tooth profile error by finish roll forming. First, we experimentally confirmed that the tooth profile error is a synthesis of the concave error and the pressure angle error. Since various types of tooth profile errors appear in the experiments, we introduced evaluation parameters for rolling gears to objectively evaluate profile quality. Using these evaluation parameters, we clarified the relationship among the tooth profile error, the addendum modification factor (A. M. factor), and the tool loading force. We verified the character of concave error, pressure angle error, tool loading force and number of cycles of finish roll forming by using a forced displacement method. This study makes clear that tool loading force and number of cycles of finish roll forming are very important factors that affect involute tooth profile error. The results of the experiment and analysis show that the proposed method reduces concave and pressure angle errors.

A Study on the Profile Modification of Spur Gears for the Prevention of Gear Tooth Overlap by Deformation (평기어 치의 변형 후 치간섭 방지를 위한 치형 수정에 관한 연구)

  • Huh, Gyoung-Jae;Park, Su-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.3 s.96
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    • pp.208-214
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    • 1999
  • The purpose of this paper is to develop a profile modification technique of spur gears and its computer program for the prevention of gear tooth overlap. In the gear system, tooth overlap produces an impact at the initial contact of some tooth pairs. In this analysis, contact surface was assumed to be unbonded and frictionless under small deformation and stain. The problem is formulated by a variational statement with inequality constraint. Tooth load sharing is obtained by the application of contact theory, and overlap is known by the analysis of deformation. After carrying out the profile modification of gear tooth, we verified the reasonable results.

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Analysis of Tooth Profile Accuracy of Enveloping Worm Thread Depending on End Mill Tool Shape (장구형 웜 나사의 절삭 엔드밀 공구 형상에 따른 치형 정밀도 분석)

  • Kang, S.J.;Kim, Y.H.
    • Transactions of Materials Processing
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    • v.28 no.4
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    • pp.183-189
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    • 2019
  • Cylindrical worm reducers are generally used in various fields and forms throughout the industry, and demand is increasing due to their role as an integral part of the industry. Market trends require high-load, high-precision components, and small-sized reducers with large loads. When using a cylindrical worm reducer, a reducer designed with a reduced center distance while maintaining the same output torque results in gear wear. To overcome this difficulty, an enveloping worm gear reducer is introduced and studied. In this paper, three types of end mill tools are used to evaluate the tooth profile accuracy for each tool shape during machining of the tooth profile for a non-developed surface worm thread. The effect of the endmill shape on the accuracy of the tooth profile was analyzed by performing 3D modeling of the surrounding worm tooth profile based on the Hindley method. In this study, we analyzed tooth profile accuracy, tooth surface roughness, and tooth surface machining time, etc. Through the study, efficient machining conditions for the enveloping worm gears and the influence of parameters on the process were presented.

A Study on Composite Tooth Profile Generation of Involute and Circular Are (인벌류우트 - 圓孤 合成齒形의 創成 에 대한 硏究)

  • 최상동;변준형;윤갑영
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.9 no.5
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    • pp.572-578
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    • 1985
  • A composite gear with involute-circular are tooth profile and a tooth profile of the rack to cut this gear are theoretictically obtained. The composite gear has involute tooth profile in the vicinity of pitch point and has circular arc tooth profiles at addendum adn dedendum. The contact ratio(M$_{c}$), chordal tooth thickness (chordal tip tooth thickness S$_{t}$, chordal root tooth thickness S$_{t}$) of the composite gear are compared with those of involute gear. When module, number of teeth and pressure angle eqaul, S$_{t}$ of composite gear is much larger than that of involute gear. Under the same conditions, S/sib t/ and M$_{c}$ of composite gear become smaller than those of involute gear.lute gear.

Design of Gerotor with Pin-tooth Inner Rotor (핀치형 내부로터의 제로터 설계)

  • Lee, Sung-chul
    • Tribology and Lubricants
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    • v.36 no.2
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    • pp.64-67
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    • 2020
  • In the conventional gerotor design, the circular arc tooth of the outer rotor is first introduced, and then the inner rotor profile is generated by simulating the outer rotor motion while the inner rotor is fixed. The profile generation of tooth meshing exhibits relativity; therefore, the outer rotor profile can be generated by the movement of the inner rotor. In this study, we propose the design of a gerotor with a pin-tooth inner rotor. First, the pin-tooth inner rotor is devised, and then the outer rotor profile is generated. The profile of the inner rotor is simply composed of equally arranged pins along a circle. The root of the inner rotor is designed as a conjugated arc of two pins. The trajectory of the pin center is obtained by the inner rotor operation, and then the outer rotor profile is determined as a parallel curve of the trajectory. In this gerotor design, the inner rotor has a simple configuration, and contact occurs between the pin parts of the inner rotor and the whole profile of the outer rotor. This affects the material selection and machining process. The pin tooth can be used to design the outer and inner rotors, enabling a double gerotor mechanism corresponding to a planetary gear system.