DYNAMIC SYNTHESIS OF THE ROTARY CAM AND TRANSLATED TAPPET WITH ROLL

Autores

  • Florian Ion Petrescu Bucharest Polytechnic University
  • Relly Victoria Petrescu Bucharest Polytechnic University

DOI:

https://doi.org/10.22409/engevista.v15i3.491

Resumo

This paper presents an original method to determine the dynamic parameters at the camshaft (the distribution mechanisms). The authors introduce a new pressure angle, alpha, and a new method to determine the two pressure angles, alpha and delta, at the rotary cam and tappet with translational motion with roll, with a great precision. We determine initially the mass moment of inertia  (mechanical) of the mechanism, reduced to the element of rotation, ie at cam (basically using kinetic energy conservation, the system 1). The rotary cam with translated follower with roll (Figure 1), is synthesized dynamic. We considered the law of motion of the tappet classic version already used the cosine law (both ascending and descending). The angular velocity is a function of the cam position (j) but also its rotation speed (2). Where ωm is the nominal angular velocity of cam and express at the distribution mechanisms based on the motor shaft speed (3). We start the simulation with a classical law of motion, namely the cosine law. To climb cosine law system is expressed by relations (4). With the relation (5) is expressed the first derivative of the reduced mechanical moment of inertia. It is necessary to determine the angular acceleration (6). Relations (2) and (6) a general nature and is basically two original equations of motion crucial for mechanical mechanisms. For a rotary cam and translated tappet with roll mechanism (without valve), dynamic movement tappet is expressed by equation (7). Where x is the dynamic movement of the pusher, while s is its normal, kinematics movement. K is the spring constant of the system, and k is the spring constant of the tappet spring. It note, with x0 the tappet spring preload, with mT the mass of the tappet, with ω the angular rotation speed of the cam (or camshaft), where s’ is the first derivative in function of j of the tappet movement, s. Differentiating twice successively, the expression (7) in the angle j, we obtain a reduced tappet speed (equation 8), and reduced tappet acceleration (9). Further the acceleration of the tappet can be determined directly real (dynamic) using the relation (10). For a good work one proposes to make a new geometro-kinematics synthesis of the cam profile, using some new relationships (16).

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Biografia do Autor

Florian Ion Petrescu, Bucharest Polytechnic University

Nihil sine Deo

Ph.D. Eng. Florian Ion PETRESCU
Senior Lecturer at UPB (Bucharest Polytechnic University).

Citizenship: Romanian;
Date of birth: March.28.1958;
Higher education: Polytechnic University of Bucharest, Faculty of Transport, Road Vehicles Department, graduated in 1982, with overall average 9.63;

Doctoral Thesis: „Theoretical and Applied Contributions About the Dynamic of Planar Mechanisms with Superior Joints”.

Expert in Industrial Design, Engineering Mechanical Design, Engines Design, Mechanical Transmissions, Dynamics, Vibrations, Mechanisms Machines Robots and Mechatronics.

Association:
Member ARoTMM - IFToMM, SIAR-FISITA, ARR.

Languages known:
-French; -English.

Related activities and functions:

Instructor and Social Commission Head of CUB (Bucharest’s University Center) 1985-1987, the Third Head of CUB after [Moncea] and Bostan, 1985-1987.

Relly Victoria Petrescu, Bucharest Polytechnic University

Nihil Sine Deo

Ph.D. Eng. Relly Victoria PETRESCU
Senior Lecturer at UPB (Bucharest Polytechnic University),

Citizenship: Romanian;
Date of birth: March.13.1958;
Higher education: Polytechnic University of Bucharest, Faculty of Transport, Road Vehicles Department, graduated in 1982, with overall average 9.50;

Doctoral Thesis: "Contributions to analysis and synthesis of mechanisms with bars and sprocket".

Expert in Industrial Design, Engineering Mechanical Design, Engines Design, Mechanical Transmissions, Projective and descriptive geometry, Technical drawing, CAD, Automotive engineering, Vehicles, Transportations.

Association:
Member ARoTMM-IFToMM, SIAR-FISITA, ARR, SORGING.
Languages known:
-French; -English.

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Publicado

2013-04-29

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