Method for detecting cam lift of cam shaft

Abstract

The invention belongs to mechanical methods, and particularly relates to a method for detecting cam lift of a cam shaft. The method is characterized in that a rotary table and a tail frame are mounted at one end of a base, the top axis of the tail frame is overlapped with that of the rotary table, center holes at two ends of the cam shaft are clamped by the aid of the top of the rotary table and the top of the tail frame respectively, an elastic measuring head is mounted on a linear guide rail, the rotary table is provided with a driving motor and a rotating angle encoder, the elastic measuring head is provided with a linear displacement sensor, the rotating angle encoder and the linear displacement sensor are connected to a measuring and controlling system, the rotary table drives the cam shaft to rotate, linear displacement of the measuring head at each rotating angle position of a cam is detected by the measuring and controlling system in the rotating process, so that contour parameters of the measured cam are determined, and the lift of each rotating angle position of the cam is calculated by the aid of set driven tappet parameters. The method is simple, convenient, easy, scientific and reasonable, and high in measuring accuracy.

Description

technical field [0001] The invention belongs to the class of mechanical methods, in particular to a method for detecting the cam lift of a camshaft. Background technique [0002] In the precision machining process of the camshaft, such as the machining of the camshaft to control the intake and exhaust valves of the internal combustion engine, it is necessary to measure the deviation between the actual lift and the theoretical lift of the camshaft being machined, so as to determine the machining accuracy and the precision of the machined parts. quality. The current method used to detect the cam lift of the camshaft, such as using the ADCOLE camshaft inspection instrument, is mainly to fix it on the precision rotary shaft through the center holes at both ends of the camshaft, and use the motor to drive the camshaft to rotate. During the process, the measuring head with the same specifications as the camshaft driven tappet is pressed against the cam surface with elastic force,...

AI Technical Summary

Problems solved by technology

However, there are various types and specifications of camshafts, and the specifications of the driven tappets are also various, such as flat tappets, roller tappets of various diameters, etc., which makes it necessary to frequently exchange the corresponding camshaft lifts when testing different types of camshaft lifts. Matching driven measuring head

This complicates the measurement process and increases the difficulty of calibrating the measuring instrument

At present, there is no universal detection method for camshaft lift that can adapt to driven tappets of different specifications, is scientific, reasonable, and simple.

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