Phase position checking device for assembly of timing gear

The utility model discloses a phase position checking device for assembly of a timing gear. The phase position checking device comprises a cylindrical sleeve, a positioning pin and a pointer, wherein the inner cylindrical hole of the cylindrical sleeve is in sliding matching with a crankshaft neck; at least two flanges are arranged at intervals on the outer circumferential wall of the cylindrical sleeve; a through hole is formed in each flange; the central line of the through hole in each flange is on the same straight line and is parallel to the central line of the cylindrical sleeve; a pin hole is formed in the radial direction of the outer circumferential wall of the cylindrical sleeve; the central line of the pin hole is orthogonally intersected with the central lines of the through holes; the positioning pin is assembled inside the pin hole and comprises a cylindrical part and a shaft shoulder; the cylindrical part is in sliding matching with a timing key groove of the crankshaft neck; arc-shaped grooves are formed in the end surface of the shaft shoulder in a circumferential array manner; the point penetrates through the through hole in each flange; when the point penetrates through the arc-shaped grooves, the cylindrical part of the positioning pin can be tightly pressed inside the timing key groove; the end head of the pointer is used for pointing to a timing mark of the timing gear. The phase position checking device is precise and convenient to repair and concise in structure.