Piston with stiffening structure for lower skirt regions
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United States of America Patent
Stats
-
Apr 4, 1989
Grant Date -
N/A
app pub date -
Jun 19, 1987
filing date -
Jun 27, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Pistons are described having improved stiffness of the lower skirt regions to improve piston guidance and oil film distribution. The pistons comprise a crown portion including piston ring grooves and a skirt portion, the skirt portion being divided into an upper skirt region and a lower skirt region and wherein on each side of the plane including the piston axis and the gudgeon in axis the support skirt region includes at least one bearing surface and the lower skirt region comprises a bearing surface supported by two substantially planar skirt wall sections lying in planes forming an acute angle of less than 75.degree. with the plane which includes the piston and gudgeon pin axes, the maximum bearing contact arc of the lower skirt bearing surface lying between 10.degree. and 22.5.degree. either side of the lane which is normal to the gudgeon pin axis and which includes the piston axis.
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