• Title, Summary, Keyword: Cam Profile

Search Result 116, Processing Time 0.047 seconds

A Study on the Design of Diesel Engine Cam Profile (디젤엔진용 캠의 형상 설계에 관한 연구)

  • Lee, Wan-Ha;Song, Hwa-Seop;Hong, Jun-Hee
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.15 no.3
    • /
    • pp.104-110
    • /
    • 2006
  • It is a study on the design of a cam profile for diesel engine SOHC. It is used a reverse engineering method without the usual copy processing. It draws up the contour data from an actual cam and processes by CNC. The profile of the cam is reappeared to be up to operational specifications that are the opening and shutting time, lift, speed and acceleration of the inhalation and escape valves. While the cam operating, the noise and vibration are occurred by the sudden change of speed. The new design of cam profile is suitable fur the valve operations to be smooth. We propose the design method of a cam profile far the reappearance of an actual cam. It is proved to be the propriety about the design of the cam profile through the processing, measurement, and comparison of the cam profile.

A Multi-Polynomial Synthesis Method for DRRD Cam Profile Optimizations and Effects of Shape Factors on the Cam Lobe Area (DRRD 캠 형상 최적 설계를 위한 다항식 합성법과 캠 로우브 면적에 미치는 형상 계수들의 영향)

  • 김도중;박성태
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.2 no.4
    • /
    • pp.59-71
    • /
    • 1994
  • A multi-polynomial method is proposed to synthesize DRRD cam profiles. A cam lift duration s divided into 10 sections, each of them is expressed by a polynomial equation. 12 design variables are extracted from the cam profile displacement, velocity, and acceleration curves. Because all the design variables have physical meanings which are familiar to most cam designers, it is easy to imagine a profile shape from the design variables. The design envelope of the method is wide enough to be used in DRRD automotive cam designs. Polydyne cams, widely used in automotive engines, are included into the envelope. Unlike Polydyne cams, the method provides capability of wide velocity factor variations, which gives much flexibility in flat-faced tappet design. Area factor of profiles designed by the method can be increased 5-10% compared to those of Polydyne cams without increasing acceleration factor. The method is especially useful for cam profile optimizations.

  • PDF

A Study on the Cam Profile Synthesis Method for Automotive Engines Using Hermite Curve (Hermite 곡선을 이용한 자동차 엔진 캠 형상 합성법에 관한 연구)

  • Kim, D.J.;Lee, J.W.
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.3 no.5
    • /
    • pp.90-99
    • /
    • 1995
  • A numerical method is proposed to synthesize automotive cam profiles. An arbitrary acceleration profile for the cam follower motion is divided into several segments, each of them is described by a Hermite curve. A cam profile is defined by control point locations and control variables assigned to each segment. Closed form equations are derived for velocity and displacement constraints which should be satisfied for the curve to be a cam profile. Because the method is flexible and provide arbitrary local controllability, any types of cam acceleration profile can be reproduced by the method. The method is expecially useful for the design of roller type OHC valve trains which need precise local control in the cam profile design to avoid under-cutting problems.

  • PDF

평면 캠-링크 기구의 설계 소프트웨어 개발

  • 양현익;유호윤
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • /
    • pp.788-793
    • /
    • 1995
  • For a linkage mechanism deiven by cam, cam profile is the major design factor and is determined by the motion type od cam follower. If a cam mechanism has additional kinematic linkages besides cam and follower then the follower motion should be specified form the motion of end linkage member so that cam would be able to generate the desired end linkage motion. In this paper, a cam-linkage mechanism is constructed with the combinations of modular linkage elements including cam and follower and as a resullt, a planar cam-linkage mechanism design software with the cam profile optimization function is developed and presented.

  • PDF

REDUCTION OF HIGH FREQUENCY EXCITATIONS IN A CAM PROFILE BY USING MODIFIED SMOOTHING SPLINE CURVES

  • Kim, D.J.;Nguyen, V.T.
    • International Journal of Automotive Technology
    • /
    • v.8 no.1
    • /
    • pp.59-66
    • /
    • 2007
  • High frequency excitation terms in a cam profile can excite vibration of a cam follower system. In this paper, modified smoothing spline curves are used to reduce the high frequency terms. The essential difference between the proposed method and other existing approaches is its ability to make the principal cam motions smooth while still exactly satisfying boundary conditions of follower displacement, velocity and acceleration. The boundary values usually depend on the ramp properties of a cam. Our method, thus, allows designers to smooth the existing cam motion without any damages on its ramp areas. Because the ramp height, velocity and acceleration are maintained exactly, more radical smoothing is possible. An example shows that the proposed method can be a powerful tool of cam profile smoothing, which removes high frequency components in the cam profile excitations without any changes in ramp properties.

A Study on Design and Machining of Conjugate Cam on the Basis of Master Cam (마스트 캠에 의한 컨쥬게이트 캠의 설계 및 가공에 관한 연구)

  • Cho, Hyun Deog
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.2 no.2
    • /
    • pp.52-59
    • /
    • 2003
  • Cam mechanism is a machine part frequently used in machinery. Specially, conjugate cam mechanism is very suitable for the high speed working and the heavy power translation. Then a conjugate cam mechanism need high precision for the relations between cam profiles and follower rollers. So, its design and manufacturing are very difficult. Thus, this study is a branch of exclusive CAM systems for design and NC machining of conjugate earn mechanism based on a master plate earn profile in order to exchange an old plate cam mechanism to a new conjugate earn mechanism. For the design of the other cam profile by using a master cam profile, some calculation processes were used by vector summation methods, from master cam profile data to the center data of master follower, from the center data of master follower to the center data of the other follower considered in link mechanism, and offsetting in the center direction of base circle of the other cam from the center data of the other follower. Finally, a sample conjugate cam was selected and machined m order to prove the contents of this study.

  • PDF

Cam Profile Design of a Fuel Pump Using Dynamic Analysis (동해석을 이용한 연료펌프의 캠 형상 설계)

  • Kim Bong-Ho;Lee Boo-Youn;Kim Won-Jin
    • Journal of the Korean Society of Marine Engineering
    • /
    • v.30 no.1
    • /
    • pp.58-64
    • /
    • 2006
  • This work focuses on reducing the noise and vibration levels of an LPi fuel pump, which are generated from the dynamic motions of pump elements and non-uniform flow of fuel. The noise and vibration levels increase as the revolution speed of the cam goes up. The fuel pump consists of five cavity cells, plungers and diaphragms, which are driven by the cam. The optimal design of the cam profile is performed to decrease the accelerations of moving Parts and to obtain a smooth hydraulic force through a dynamic analysis of a cam-plunger mechanism. The cam-Plunger with a cavity is modeled as a 2 degrees of freedom system having non-linear contacts, the cam profile being represented in terms of Fourier series in order to determine the optimal shape of the cam. From the optimized cam Profile, the acceleration of the diaphragm is reduced in $78\%$, the hydraulic force becoming smoother in case that the hydraulic force is rapidly dropped.

Development of Modulated Planar Cam-Linkage Mechanism Design Software (평면 캠-링크 복합 기구용 설계 소프트웨어 개발)

  • Yang, Hyun-Ik;Yu, Ho-Yune
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.16 no.1
    • /
    • pp.125-131
    • /
    • 1999
  • For linkage mechanisms driven by a cam, cam profile is the major design factor and is determined by the cam follower motion. If a cam mechanism has additional kinematic linkage besides cam and follower then the follower motion should be specified from the motion of end linkage member so that cam would be able to generate the desired end linkage motion. In this paper, a cam-linkage mechanism is constructed with the combinations of modular linkage elements including cam and follower and as a result, a planar cam-linkage mechanism design software with the cam profile optimization function is developed and presented.

  • PDF

A Study on the Machining of Cam Profile Part by Basic Interpolation Method (Biarc 곡선보간에 의한 캠 부품형상 가공에 관한 연구)

  • 정창영;김영국;윤문철;심성보;하만경;김광희
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • /
    • pp.975-978
    • /
    • 2001
  • For machining auto-mobile cam, the developed biarcs-fitting method eliminates the ridge problems in conventional straight-line fitting approximation or single-arc fitting of curve tool path where it leaves ridges of tool marks on the machined surface of the workpiece. The powerful advantage of this biarc method is demonstrated by applying it to the numerically controlled machining of a curved cam profile, also verified by using a CNC simulating program for auto-mobile cam profile. As a result, this algorithm may be used in CNC milling and turning for cam profile machining with short block line.

  • PDF

A Study on the Automation of NC Programming for Machining Cam Profile by Biarc Interpolation Method (캠 형상 가공을 위한 Biarc 곡선보간법을 이용한 NC 프로그래밍의 자동화에 관한 연구)

  • Jung, C.Y.;Kim, Y.K.;Yoon, M.C.;Sim, S.B.;Ha, M.K.;Kim, K.H.
    • Journal of the Korea Society For Power System Engineering
    • /
    • v.5 no.2
    • /
    • pp.43-49
    • /
    • 2001
  • For machining auto-mobile cam, the developed biarcs-fitting method eliminates the ridge problems in conventional straight-line fitting approximation or single-arc fitting of curve tool path where it leaves ridges of tool marks on the machined surface of the workpiece. The powerful advantage of this biarc method is demonstrated by applying it to the numerically controlled machining of a curved cam profile, also verified by using a CNC simulating program for auto-mobile cam profile. As a result, this algorithm may be used in CNC milling and turning for cam profile machining with short block line.

  • PDF