Arc groove depth qualification measuring instrument

Abstract

The invention discloses an arc groove depth qualification measuring instrument, which comprises a measuring rod and a measuring body, wherein the measuring rod and the measuring body are installed ina matched mode, one end of the measuring rod is a measuring end, the radius of the measuring end is consistent with the radius of a cam support arc limiting groove, and the thickness of the measuringend is consistent with the width of the cam support arc limiting groove; one end of the measuring body is processed into a step shape, the other end of the measuring body is processed into an arc shape, the radius of the arc shape of the measuring body is consistent with the radius of a cam support wheel shaft hole, the measuring body is supported on the wall of a cam shaft hole during measurement, and an end measuring head of the measuring rod is contacted with the groove bottom of the cam support arc limiting groove. The instrument is simple to operate, high in measurement efficiency and good in measurement precision and reproducibility, and can be used for inspecting the depth sizes of the machined semi-finished and finished cam support arc limiting grooves; the use of a three-coordinate measuring instrument is reduced, and the inspection cost is saved; and meanwhile, the skill requirement on an operator is reduced, and the applicability of the measuring instrument is expanded.

Description

technical field [0001] The invention relates to an instrument for measuring the conformity of the machining depth of a cam bracket, in particular to an instrument for measuring the conformity of the depth of an arc groove. Background technique [0002] The camshaft of a motorcycle engine is the main part of the valve train, and its installation and positioning on the cylinder head is very important. The cam bracket is used in combination with the cylinder head for the installation and axial and radial positioning of the camshaft. Generally, arc limit grooves are arranged on the cam bracket to control axial movement and radial fit. The depth of the arc limit groove relative to the camshaft hole is a key dimension to control the radial fit between the camshaft and the cam bracket. Whether it is qualified or not is related to whether the camshaft can be installed in place and whether the radial runout meets the requirements. Since the camshaft hole and the arc limit groove ar...

AI Technical Summary

Problems solved by technology

Since the camshaft hole and the arc limit groove are not processed at one time, and the arc limit groove has only half of the arc surface, it is difficult to find the lowest point when measuring with a depth gauge or caliper, the operation is difficult, and the measurement error is large. low precision

Generally, only a three-coordinate measuring instrument can be used to measure the depth, establish a coordinate system, simulate and calculate the position of the center of the camshaft hole and the arc limit groove, and finally obtain the depth dimension of the arc limit groove, and the number of inspections using a three-coordinate measuring instrument is small , Insufficient reliability, long inspection process, low inspection efficiency

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