Device for detecting crankshaft geometry

Abstract

The invention discloses a device for detecting the geometrical shape of a crankshaft. The device is used for measuring the longitudinal distance between the cross section of a gauge on the conical surface of the front end of the crankshaft and the front end face of the crankshaft. The device comprises a standard calibration part and a measuring assembly. The standard calibration part provides an annotated value of the longitudinal distance between the cross section of the gauge on the conical surface of the front end of the specific crankshaft and the front end face of the crankshaft, wherein the annotated value is needed for detection. The measuring assembly comprises a measuring sleeve, a measuring head shaft, a measuring blade and a dial gage, wherein the measuring head shaft is mounted in the measuring sleeve and can slide up and down, the measuring blade is an annular body, the inner diameter of the measuring blade is consistent with the annotated value, and the dial gage is mounted at the upper end of the measuring sleeve. At the time of detection, the zero position of the dial gage is determined according to the standard calibration part; when the longitudinal distance between the cross section of the gauge on the conical surface of the front end of the specific crankshaft and the front end face of the crankshaft is detected, the difference between the longitudinal distance and the annotated value is determined according to the number of division on the dial gage. The device facilitates quick detection of the specific geometric dimension of the crankshaft and is accurate in result.

Description

technical field [0001] The invention relates to the field of crankshaft manufacturing of internal combustion engines, in particular to a device for detecting the geometry of the crankshaft. Background technique [0002] In the field of crankshaft manufacturing of internal combustion engines, the geometrical accuracy is very critical, and the requirements for specific dimensional tolerances are very strict. It is a key index to measure the quality of the crankshaft by detecting some specific dimensions of the crankshaft. For example, the detection of the longitudinal distance from the section of the front cone of the crankshaft to the front end of the crankshaft. The section of the gauge mentioned in this application refers to the specific crankshaft model. The cross section of a cone at a specific diameter. [0003] At present, any detection involving the longitudinal distance from the section of the crankshaft front cone gauge to the crankshaft front end surface is general...

AI Technical Summary

Problems solved by technology

However, the former takes a long time to measure and uses a point probe. Due to the large diameter of the front end of the crankshaft, the measurement results are controversial; the latter uses a visual comparison with the Z mark line. When the taper angle of the measured crankshaft surface deviates, the accuracy of the measurement results is not accurate enough

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