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Design Innovation Paper

Enhanced Hypocycloid Gear Mechanism for Internal Combustion Engine Applications

[+] Author and Article Information
ELsayed S. Aziz

Associate Professor
Mechanical Engineering Department,
Stevens Institute of Technology,
Hoboken, NJ 07030;
Production Engineering and
Mechanical Design Department,
Mansoura University,
Mansoura 35516, Egypt
e-mail: eaziz@stevens.edu

Constantin Chassapis

Professor
Mechanical Engineering Department,
Stevens Institute of Technology,
Hoboken, NJ, 07030
e-mail: cchassap@stevens.edu

Contributed by the Mechanisms and Robotics Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received July 28, 2015; final manuscript received July 26, 2016; published online September 19, 2016. Assoc. Editor: David Myszka.

J. Mech. Des 138(12), 125002 (Sep 19, 2016) (9 pages) Paper No: MD-15-1536; doi: 10.1115/1.4034348 History: Received July 28, 2015; Revised July 26, 2016

This study investigates the incorporation of an “enhanced” hypocycloid gear mechanism (HGM) in the design and development of internal combustion engine applications. The design incorporates a uniquely geared drive that provides the means for the piston–rod assembly to transverse on a straight-line, while delivering sinusoidal profiles for piston velocity and acceleration. A further feature of this mechanism is that the pinion shafts allow for a variable leverage point between the planetary carrier assembly and the output. This characteristic provided a nonlinear rate of piston movement because of the elliptical path of the pivot around the axis of the output shaft, which by slowing down the piston movement at the top dead center (TDC) allows the truly constant-volume combustion to take place and leads to higher efficiency and higher work produced. The simulation results of the study showed that the hypocycloid gear engine produced higher in-cylinder pressure at TDC compared to the conventional slider–crank engine of the same size.

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Figures

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Fig. 1

An exploded view of the single cylinder and associated HGM assembly

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Fig. 2

Principles of hypocycloid motion to develop an HGM

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Fig. 3

Kinematic scheme of the HGM

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Fig. 4

Comparison of the piston linear displacements

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Fig. 5

Linear velocity of the piston over one complete cycle of three engines

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Fig. 6

Linear acceleration of the piston over one complete cycle of three engines

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Fig. 7

Load acting on the gear tooth over the carrier cycle (with and without offset)

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Fig. 8

Geometric parameters of the conventional engine (a) and hypocycloid gear engine (b)

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Fig. 9

Percentage of the chamber volume above the piston face from TDC to BDC

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Fig. 10

Comparison of P–V diagram for conventional and hypocycloid engines

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Fig. 11

Comparison of in-cylinder pressure curves with crank angle

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Fig. 12

HGM in multicylinder applications

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