A combined length measuring device embedded in the inner cone and inner hole of the inner end of the cylindrical gear opposite to each other

Abstract

The invention relates to a combined-type length measuring device for an inner conical hole of an inner end of an oppositely embedded cylindrical gear, and the device comprises a positioning plug rod for locating an inner hole length measurement start point, and a measuring plug rod for measuring the length of the inner hole. The positioning plug rod consists of a rod body, a start point positioning block and a positioning step, wherein the start point positioning block and the positioning step are respectively disposed at two opposite ends of the rod body. The external surface of the start point positioning block is a circular truncated cone surface, and the top end face of the start point positioning block is plane. The measuring plug rod comprises a measuring pedestal, a cooperating block, a measuring indication meter, and an adjusting screw, wherein the cooperating block and the measuring indication meter are respectively disposed at two opposite ends of the measuring pedestal. Therefore, the start point positioning block is employed for cooperating with the plane end face of the cooperating block in the measurement process, and the device achieves the quick and simple positioning of the start point of the measured inner hole, thereby improving the measurement efficiency and accuracy while guaranteeing the measurement of the length of the inner conical hole of the inner end. Moreover, the device is simple in structure, is low in cost, and is easy for production.

Description

technical field [0001] The invention belongs to the technical field of round hole length measurement, and in particular relates to a combined length measuring device for measuring the inner hole of a thin-walled cylindrical gear with an inner cone structure, which is oppositely embedded in the inner cone inner hole of the inner end of the cylindrical gear. Background technique [0002] In practical engineering applications, in order to ensure the machining accuracy of the inner hole, it is an essential step to measure the inner hole of the processed workpiece. For example, see figure 1 , figure 1 It is a cross-sectional view of a gear with an inner hole with an inner cone structure at both ends; the inner hole of the gear is processed into a stepped shape according to the functional requirements, and one section of the inner hole is an inner spline structure, that is, the AB section shown in the figure , so the inner hole can also be called a spline hole. In order to ensu...

AI Technical Summary

Problems solved by technology

Since the positioning plug rod of the device is tapered, and the matching block is a slanted block, the slanting block of the matching block needs to be in close contact with the tapered positioning plug rod during actual measurement, and the two actually belong to a cone-line contact fit, and the matching contact area is small. , it is easy to produce errors during the matching measurement, and the matching accuracy is high, and because the matching block is an oblique block, which is an asymmetric structure, shaking often occurs due to the asymmetric structure during the measurement process, and because the cylindrical length measuring device The two measuring rods are fitted with a taper line, that is, the mating surface must be processed into a beveled tapered surface, which is difficult to process, and the angle of the tapered surface must be precisely controlled. The machining accuracy of the entire measuring device is high, which is not conducive to production.

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