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Diseño de una Transmisión mécanica para realizar la División Diferencial.Other
Design of a transmission mechanics to perform the differential Division.
David Salgado Rodríguez, Alfonso González González
Department of electronics and electromechanics engineering. Universidad de ExtremaduraUniversity Center of Mérida c / Santa Teresa de Jornet 38. 06800 Mérida
Tel.: 653 46 68 69 e-mail:drs10@navegalia.com
School of industrial engineering, Elvas Ave. s/n, Badajoz 06071
01/12/2002 1. Introduction
In the process of machining of parts with regularly in its periphery, such as gears, males of threading, strawberries, etc. must use a divisor head that allows the rotation of the piece the necessary angle. The more complex divider device for its design, is used in the Division of a piece of equal spaces, when the number of divisions is prime. This article presents the design of a transmission to provide all materials divisions up to a maximum of 307 divisions.
2 Results
When the number of divisions is Prime, is the so-called differential Division, with a divider apparatus as Figure 1. Wheelbase numbered 5, stands the chain kinematics whose gear ratio should be the right to obtain the desired number of divisions. A kinematic scheme can be seen at [1].
The relationship of transmission between these axes, depends on the number of divisions that must be performed, of the transmission ratio of the endless (normally 1/40) and the number of holes of perforated plate chosen for such a Division. This article explores the transmission ratios necessary to obtain all prime numbers up to 307, and there is a way to stagger the relations of transmission in two stages, combining it with the number of holes in the plate. The number of necessary gear ratios is 40.
To obtain the necessary relationships, has designed a transmission of two stages, one through a conventional gear train and another by a train of planetary gear [2 and 3].
Figure 1. Scheme of differential divider.
3 Findings
In the milling machines not governed by numerical control, the divider plate is essential for the Division of the parts to machining. In this article has been the design of a transmission that allows the selection of the gear ratio the number of divisions is required, without having to calculate the ratio in each case and choose gears to establish the relationship between the numbered with 5 axes.
4. References
[1] N. Chernov "Machine tools" Mir Publishers, Moscow, 1989.
[2] Pennestri, E.; Sinatra, R.; PIO Belfiore, b.; "To Catalogue of Automotive Transmissions with Kinematic to Power Flow Analysis", Proc. 3rd Nat. Conf. On Applied Mechanisms and Robotics, Paper No. AMR-93-057, (1993).
[3] Hsu, C.H.; Hsu, J.J.; "An Efficient Methodology for the Structural Synthesis of Geared Kinematic Chains", Mechanism and Machine Theory 32,
957-973 (1997)
