Patent ID: 8549989
Filing Date: 2013-10-08
Classification: F02F,F16J,Y10T

Abstract:
1. A piston apparatus for an engine, comprising: a piston pin rotatably inserted in a smaller end portion of a connecting rod and having a cross-section changing portion where a cross section changes at a portion of the piston pin; and a fixing member rotatably engaging the connecting rod and a piston through the cross-section changing portion to restrain longitudinal movement of the piston pin with respect to the connecting rod; wherein the cross-section changing portion of the piston pin is a piston pin groove depressed from an outer surface of the piston pin in a ring shape with a predetermined depth; and wherein the fixing member is a connecting pin passing through and inserted in the smaller end portion of the connecting rod and being coupled in the piston pin groove of the piston pin in the smaller end portion of the connecting rod; wherein the connecting pin is formed in a U-shape having two straight portions parallel with each other and a connecting portion connecting ends of the two straight portions, and the two straight portions are inserted in two connecting holes formed in the smaller end portion of the connecting rod and coupled to each piston pin groove.