Abstract: A novel portable elliptical trainer is invented. The motional properties and
shortages of the existing products are introduced briefly. The design programs of this mechanism
are analyzed based on the principles of ergonomics. Motion geometry analysis is carried out with
a working model, and the three dimensional models is accomplished with the Pro/E software
knowledge. It can be seen from the design results that the structure of the mechanism is very
simple and flexible, and conveniently employed in different applications.

Key words: machine design, portable elliptical trainer, ergonomics, solid modeling