Method for detecting helix angle

Abstract

The invention discloses a method for detecting a helix angle. The method is used for detecting the helix angle of the excircle surface of a shaft sleeve on a crankshaft pulley, and comprises the following steps of: horizontally placing the shaft sleeve; sleeving an annular cotton yarn on the excircle of the shaft sleeve in a sleeving mode, wherein a hanging object with a certain weight is hung onthe cotton yarn; recording an axial position of the cotton yarn relative to the shaft sleeve, wherein the position is the initial position of the cotton yarn; rotating the shaft sleeve multiple circles, so that the cotton yarn moves in the axial direction of the shaft sleeve, and recording an axial position of the cotton yarn relative to the shaft sleeve, wherein the position is the end position of the cotton yarn; and calculating the helix angle on the excircle of the shaft sleeve according to a formula, wherein LA is the angle of the helix angle, SA is the moving distance of the cotton yarnin the axial direction, SC is the length of the outer circumference of the shaft sleeve, and NR is the number of turns of rotation of the shaft sleeve. The method is simple in detection process and precise in measurement result.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a method for detecting the helix angle. Background technique [0002] The car crankshaft pulley assembly is usually installed at the front end of the engine crankshaft. Its main function is to drive other accessories. It can also suppress or eliminate the torsional vibration of the crankshaft and reduce the vibration and noise of the whole vehicle. [0003] Such as figure 1 As shown, part of the crankshaft pulley has a rotary sealing surface, and the rotary sealing surface usually exists in the form of a shaft sleeve 1 (that is, the outer circular surface of the shaft sleeve 1 is a rotary sealing surface). In an ideal state, the rotary sealing surface is smooth, and its roughness level is very high, so as to ensure the oil sealing effect after it cooperates with the sealing ring. However, in the actual surface machining process, the relative axial movement of the processing too...

AI Technical Summary

Problems solved by technology

The helix angle of the shaft will affect the sealing performance of the radial lip and oil seal. If the actual angle after machining the helix angle of the shaft deviates too much from the design value, the helix texture structure may cause damage to the inner cavity of powertrain products. leakage of the working medium, resulting in quality problems

[0004] At present, general size detection cannot detect the angle of the helix, or the detected angle is not accurate

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