Native Over-Expanded Engine Based on a Planetary Crankshaft with Enhanced Balancing Universidade do Minho

Format:

Book

Conference/Event

Author/Creator:

Capela, Capela, author.

Contributor:

Brito, F. P.

Costa, Tiago J.

Martins, Jorge

Meireles, José

Conference Name:

WCX SAE World Congress Experience (2019-04-09 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2019

Summary:

AbstractOver-expansion is one of the promising strategies for improving Internal combustion engine (ICE) efficiency and emissions. It can be implemented by using an unconventional crankshaft. These mechanisms have mass production potential and acceptable friction losses, but also a complex kinematic and dynamic behaviour. This paper proposes such a crank design, a small planetary hypotrochoid over-expanded single cylinder engine - UMotor - and compares it to equivalent conventional ICEs with similar intake or expansion strokes. A suitable crankshaft counter weight geometry was determined in order to minimize the overall reaction forces. The mass balancing studies were conducted via a dynamic motion analysis of the crank drive, including a Fast Fourier Transform (FFT) frequency analysis. For the tested engine speeds, the UMotor average and peak magnitude reaction forces proved to be similar to those generated in the conventional engines for intermediate and high engine speeds. Also, the UMotor displayed fewer high frequency harmonics, indicating a lower structural disturbance of the chassis of a vehicle equipped with one of these engines

Notes:

Vendor supplied data

Publisher Number:

2019-01-1194

Access Restriction:

Restricted for use by site license