Expansible chamber devices – Piston – Open-ended hollow skirt type
Patent
1992-01-23
1993-03-16
Look, Edward K.
Expansible chamber devices
Piston
Open-ended hollow skirt type
92237, F16J 104
Patent
active
051934361
ABSTRACT:
This invention relates to the shape of a skirt below the piston head of a piston in an engine cylinder and continuous with it. The skirt has a basic configuration comprising at least two type of elliptical horizontal cross-section with a short axis parallel to said piston pin, and a barrel-shaped vertical cross-section smaller at its top and bottom. A T-shaped projection is also provided on the lateral surfaces of the skirt corresponding to the two ends of the long axis of said ellipse, this projection consisting of a vertical piece and two side pieces situated on either side of the vertical piece. When the engine is running, the skirt comes into contact with the inner surface of the cylinder via this projection. The vertical section of the lower part of the skirt from below the lower edge of the two side pieces to the lower edge of the skirt is inclined toward the inside of said barrel-shaped vertical section so that the skirt is joined smoothly to the projection below the two side pieces. Accumulation of pressure on the edge of the projection is thereby prevented, which reduces frictional resistance and prevents wear between the piston and the cylinder.
REFERENCES:
patent: 2309555 (1943-01-01), Venner et al.
patent: 2513814 (1950-07-01), Moore
patent: 4535682 (1985-08-01), Collyear et al.
patent: 4756241 (1988-07-01), Sakurahara et al.
patent: 4817505 (1989-04-01), Rhodes
patent: 4831919 (1989-05-01), Bruni
Arai Takayuki
Goto Takaharu
Hamai Kyugo
Usuki Hisafumi
Look Edward K.
Lopez F. Daniel
Nissan Motor Co,. Ltd.
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