Parts for crankshaft of internal combustion engine or compressor, crankshaft, internal combustion engine and compressor

Abstract

A single bell crank for a crankshaft of an internal combustion engine or a compressor includes a single bell crank main journal () and a crank pin (), wherein the crank pin () is vertical to the single bell crank main journal () and extends out, the axis of the crank pin () is offset relative to that of the single bell crank main journal (), the front end of the crank pin () is tapered, at least one first positioning half hole (-) is provided on the circumference of the end face of the tapered end () and can match with a second positioning half hole (-) in a crank to form a positioning pin hole. A crank for a crankshaft of an internal combustion engine or a compressor includes a crank main journal () provided with a taper hole () matching with the tapered end () of the crank pin (), wherein the axis of the taper hole () is offset relative to that of the crank main journal (); the inner diameter surface of the taper hole () is provided with the second positioning half hole (-) corresponding to the first positioning half hole (-) in the single bell crank matching with the taper hole (), and the second positioning half hole (-) and the first positioning half hole (-) can form a complete positioning hole after the single bell crank and the crank are assembled together.