Ball bearing piston and liner
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United States of America Patent
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Apr 13, 1999
Grant Date -
N/A
app pub date -
Apr 3, 1996
filing date -
Apr 3, 1996
priority date (Note) -
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status (Latency Note)
Importance
Abstract
This invention relates to a piston with skirt being formed by four sets of bearing grooves as the main structure, and a cylinder liner with four ball bearing rolling tracks. The bearing groove is in doughnut shape and has a circular cross-section to hold the ball bearing in circulation during the reciprocating motion of the piston. Two lines of ball bearings on each side of a piston pin are in line contact to the bearing tracks of the cylinder liner and share the piston thrust load. Lubrication of the ball bearings is ensured by oil slots through the piston head under the oil ring groove to the exposed ball bearings in rolling contact and to the top of the bearing groove.
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