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

Abstract

It is a pump inner axis fit clearance dynamic measurement method in machine part measurement field, which uses the running displacement of oil-spray pump inner axis to measure the axis clearance of the inner axis of the spray pump. This method comprises the following steps: first to exert large press force on the head of the pump; the down axis top-lifting device to lift the inner axis of the pump inner axis; and the top axletree outer ring press measurement haulm remains stuck to the inner axis top by spring force; to determine the axis clearance of the inner axis of the pump through the measurement data of the sensor. When the axis clearance value achieves the work art requirements, another sensor measures the height between the outer ring surface of inner axletree and the pump surface.

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.