Dynamic detection method for axial fit clearance of pump body inner shaft

Abstract

A dynamic detection method for the axial fit clearance of the inner shaft of the pump in the field of mechanical component detection. The axial clearance of the inner shaft of the fuel injection pump is measured by using the axial movement displacement of the inner shaft of the fuel injection pump. The pressing force is pressed, the lower axial jacking mechanism lifts the inner shaft along the axial direction of the inner shaft of the fuel injection pump, and the upper bearing outer ring press-in amount measuring rod is kept close to the upper part of the inner shaft by spring force, and is measured by the sensor The data determines the axial clearance of the inner shaft of the fuel injection pump. When the axial clearance value meets the process requirements, another sensor measures the height from the end surface of the inner shaft bearing outer ring to the end surface of the pump body. The invention has the advantages of simple mechanical structure, good cost performance, reliable, objective and accurate measurement process, high repeatability, simple and rapid operation; and objectively reflects the dynamic situation of the measured object in the actual working state, eliminating the need for various components The impact of tolerance and system error on measurement results is suitable for mass measurement in production lines.

Description

technical field [0001] The invention relates to a dynamic detection method for an axial fit clearance, in particular to a dynamic detection method for an axial fit clearance of a shaft in a pump body. Used in the field of mechanical parts testing. Background technique [0002] The fuel injection pump is assembled from a number of mechanical components or parts such as the fuel injection pump body, the oil pump mechanism, the fuel volume adjustment mechanism, and the drive mechanism. The camshaft is the main part of the driving mechanism of the fuel injection pump, and the requirements for the axial clearance of the camshaft are very strict. If the gap is too large, the impact of the roller transmission parts on the cam working surface will increase, resulting in early wear of the cam surface and changing the oil supply advance angle; at the same time, it will easily cause the camshaft to run unstable, and the oil supply will change periodically, causing the engine to run I...

AI Technical Summary

Problems solved by technology

Although this method performs axial preload on the inner shaft while the inner shaft is rotating, it is difficult to guarantee repeatability and reliability due to manual adjustment of the press-in amount of the outer ring. The height h2 is under the condition of no axial preload, and the measurement accuracy will also change due to the slight elastic recovery displacement and small amplitude swing of the bearing in the axial direction.