Engine piston

Details Engine piston Engine piston

1994-02-25

1995-09-12

Ryznic, John E.

Expansible chamber devices

Piston

Open-ended hollow skirt type

1231936, F16J 104, F02F 300

Patent

active

054489423

ABSTRACT:
A piston is free to slide in an engine cylinder, this piston comprising a piston head of circular cross-section, a skirt formed such that it is continuous with the lower part of said piston head, a piston pin passing through the skirt, and a connecting rod connected via this piston pin. This skirt comprises an upper part and a lower part which respectively have an elliptical horizontal cross-section with a short axis parallel to the piston pin, the horizontal cross-section of the upper part of the skirt having a higher eccentricity than that of the lower part of the skirt. The skirt further comprises a taper surface which smoothly connects its upper and lower parts. The contact surface between the skirt and the cylinder therefore has an inverted T shape so that the contact surface of the lower part of the skirt can be increased. It is therefore possible to set the distance from the center of the piston pin to the lower edge of the skirt such that it is no greater than 1.8 times the distance from the center of the piston pin to the upper edge of the skirt, so making the piston more compact while maintaining operational stability.

REFERENCES:
patent: 4648309 (1987-03-01), Schellmann
patent: 4716817 (1988-01-01), Ripberger et al.
patent: 4756241 (1988-07-01), Sakurahara et al.
patent: 5058489 (1991-10-01), Iwaya
patent: 5076226 (1991-12-01), Watanabe et al.
patent: 5107807 (1992-04-01), Arai et al.
patent: 5158008 (1992-10-01), Ripberger et al.
patent: 5193436 (1993-03-01), Hamai et al.

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