In this paper, a theoretical and experimental investigation on an innovative cycloidal speed reducer is presented. The typical cycloid drive has a planet wheel, the profile of which is the internal offset of an epitrochoid meshing with cylindrical rollers connected to the case. This reducer, on the contrary, has an external ring gear, the transverse profile of which is the external offset of an epitrochoid and engages with the planet wheel by means of cylindrical rollers. This paper investigates the structural characteristics and the kinematic principles of this type of reducer. A theoretical approach based on the theory of gearing (following Litvin’s approach) is developed and compared to a development of Blanche and Yang’s approach. Furthermore, a simplified procedure to calculate the force distribution on cycloid drive elements, its power losses, and theoretical mechanical efficiency is presented. The effects of design parameters on the values of forces are studied for an optimal design of this type of reducer. The theoretical model is tuned on the basis of the results of tests made on purpose. The mechanical efficiency dependency on speed and torque is described. The main aim of this work is to tune a theoretical model in order to predict the operating behavior of the cycloid drive and to improve its design procedure.
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e-mail: carlo.gorla@polimi.it
e-mail: piermaria.davoli@polimi.it
e-mail: francesco.rosa@polimi.it
e-mail: claudio.longoni@mecc.polimi.it
e-mail: alessandro.samarani@bettinelli.it
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November 2008
Research Papers
Theoretical and Experimental Analysis of a Cycloidal Speed Reducer
Carlo Gorla,
Carlo Gorla
Mem. ASME, Mem. AGMA
Dipartimento di Meccanica,
e-mail: carlo.gorla@polimi.it
Politecnico di Milano
, I-20156 Milano, Italy
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Piermaria Davoli,
Piermaria Davoli
Dipartimento di Meccanica,
e-mail: piermaria.davoli@polimi.it
Politecnico di Milano
, I-20156 Milano, Italy
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Francesco Rosa,
Francesco Rosa
Dipartimento di Meccanica,
e-mail: francesco.rosa@polimi.it
Politecnico di Milano
, I-20156 Milano, Italy
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Claudio Longoni,
Claudio Longoni
Dipartimento di Meccanica,
e-mail: claudio.longoni@mecc.polimi.it
Politecnico di Milano
, I-20156 Milano, Italy
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Alessandro Samarani
e-mail: alessandro.samarani@bettinelli.it
Alessandro Samarani
CDS-Bettinelli F.Lli SPA
, I-26010 Bagnolo Cremasco (CR), Italy
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Carlo Gorla
Mem. ASME, Mem. AGMA
Dipartimento di Meccanica,
Politecnico di Milano
, I-20156 Milano, Italye-mail: carlo.gorla@polimi.it
Piermaria Davoli
Dipartimento di Meccanica,
Politecnico di Milano
, I-20156 Milano, Italye-mail: piermaria.davoli@polimi.it
Francesco Rosa
Dipartimento di Meccanica,
Politecnico di Milano
, I-20156 Milano, Italye-mail: francesco.rosa@polimi.it
Claudio Longoni
Dipartimento di Meccanica,
Politecnico di Milano
, I-20156 Milano, Italye-mail: claudio.longoni@mecc.polimi.it
Franco Chiozzi
Alessandro Samarani
CDS-Bettinelli F.Lli SPA
, I-26010 Bagnolo Cremasco (CR), Italye-mail: alessandro.samarani@bettinelli.it
J. Mech. Des. Nov 2008, 130(11): 112604 (8 pages)
Published Online: September 30, 2008
Article history
Revised:
May 27, 2007
Received:
July 31, 2007
Published:
September 30, 2008
Citation
Gorla, C., Davoli, P., Rosa, F., Longoni, C., Chiozzi, F., and Samarani, A. (September 30, 2008). "Theoretical and Experimental Analysis of a Cycloidal Speed Reducer." ASME. J. Mech. Des. November 2008; 130(11): 112604. https://doi.org/10.1115/1.2978342
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