BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI
Publicat de
Universitatea Tehnică „Gheorghe Asachi” din Iaşi
Tomul LVIII (LXII), Fasc. 3, 2012
Secţia
MATEMATICĂ. MECANICĂ TEORETICĂ. FIZICĂ
ANALYSIS OF A CIRCULAR ECCENTRIC CAM
BY
RADU IBĂNESCU ∗1 and CĂTĂLIN UNGUREANU 2
”Gheorghe Asachi” Technical University of Iaşi,
1 Department of Theoretical Mechanics
2 Department of Machine Tools
Received: May 28, 2012
Accepted for publication: July 15, 2012
Abstract. Circular eccentric cam mechanisms are components of various
mechanical devices. The cam follower can get stuck into its guide if the
mechanism dimensions are not properly designed. The paper analyses how this
situation can be avoided by a correct choice of mechanism dimensions based on
solving a series of equilibrium equations. The calculus is performed using the
Mathcad software.
Key words: circular eccentric cam, cam follower stick, proper mechanical
design.
1. Introduction
The circular eccentric mechanism is well known in mechanical
engineering. This kind of mechanism is very simple and does not create difficult
problems in its design (Sclater & Chironis, 2007), (Beer et al. 2007), (Hibbeler,
2007), (Meriam & Kraige, 2007), (Rosculet, 1982). Nevertheless, a troublesome
event can occur, namely the sticking of the cam follower in the cam follower
guide. This problem can be avoided if the length of the cam follower guide is
properly chosen. The choice can be made after a thorough analysis of the forces
acting on the system and solving the equations of equilibrium of the mechanism
parts. On the other hand, even if the cam follower does not stick, it is possible
for a very large moment to be required for the cam to develop its motion. A
∗ Corresponding author: e-mail: ribanesc@yahoo.com