Special caliper for shaft key groove

Abstract

The invention relates to a special caliper for an armature keyway capable of measuring physical dimensions of the armature keyway, which comprises a main scale, an auxiliary scale, a display, depth measurement accessories, a dipstick, a scale frame and other parts, wherein the main scale consists of a main scale upper measuring jaw, a main scale lower measuring jaw and a main scale body; the main scale lower measuring jaw is short and takes the shape of a cuboid; the auxiliary scale consists of an auxiliary scale body, an auxiliary scale lower measuring jaw and an auxiliary upper measuring jaw; the auxiliary scale lower measuring jaw is long; the auxiliary scale, the scale frame and the depth measurement accessories are arranged on the main scale body and can all perform relative motion; the display and the dipstick are arranged on the auxiliary scale and move along with the auxiliary scale; a measuring surface and the bottom surface of the main scale lower measuring jaw contact the side face and the bottom surface of the keyway respectively; the auxiliary scale lower measuring jaw contacts an excircle of a shaft and measures the symmetry degree error of the keyway; a measuring surface of the main scale upper measuring jaw and a measuring surface of the auxiliary scale upper measuring jaw contact two side faces of the keyway respectively and measure the width of the keyway; the depth measurement accessories are placed on the shaft; and the dipstick contacts the bottom surface of the keyway and measures the depth of the keyway.

Description

technical field [0001] The invention relates to a measuring device for a keyway of a shaft, in particular to a special caliper for measuring the symmetry of the keyway of a shaft, the width of the keyway, the depth of the keyway and the like. Background technique [0002] At present, there are two known methods for measuring the symmetry error of the shaft keyway, that is, the positioning block method (or false key method) and the axis symmetry measuring instrument method. [0003] Positioning block method: put the V-shaped block on the flat plate, the measured shaft is placed on the V-shaped block, the positioning block is inserted into the keyway (interference fit), the dial indicator probe contacts the positioning block, and the measured shaft is rotated to make the positioning The block is parallel to the plate along the radial direction, write down the reading a1 of the dial indicator, then rotate the measured axis 180°, measure in the same direction in the same section...

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the shortcomings of the existing shaft keyway symmetry, width, and depth measurements that require many measuring instruments and are inconvenient, the present invention provides a new type of measuring tool—a special caliper for shaft keyway, which can be easily measured with a single ruler. Keyway symmetry, width, depth and other dimensions

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