CN103344167A - Crankshaft semicircular key groove depth detection tool - Google Patents

Abstract

The invention relates to a crankshaft semicircular key groove depth detection tool which comprises a base, a depth dial indicator and a fixing screw. A round through hole is perpendicularly formed in the middle of the base, a screw hole is formed in the side face of the base, the bottom face of the base is an arc face which is matched with the surface of a crankshaft neck where a crankshaft semicircular key groove is located, a measuring rod of the depth dial indicator is inserted in the round through hole, and the side face of the measuring rod is pressed and fixed with the screw hole in a matched mode through the fixing screw. The tool is simple in structure, convenient to use, reliable, accurate in depth measurement, capable of achieving fast measurement, and suitable for depth measurement of various shaft semicircular key grooves or flat key grooves.

Description

Crankshaft semicircular keyway depth detection tool

technical field

The invention relates to a device for measuring the size of a keyway of a shaft part, in particular to a tool for detecting the depth of a semicircular keyway of a crankshaft.

Background technique

We know that the pulley installed on the small end of the engine crankshaft is usually fixed with a semicircular key in the circumferential direction. Therefore, the dimensional accuracy of the keyway is required on the crankshaft finished drawing. In order to meet the requirements of the processing technology, in addition to being controlled by the equipment during the processing process, it is also necessary to measure and check its depth dimension. Usually, it is measured with a vernier caliper or a depth gauge. Due to poor contact between the head of the measuring ruler and the lowest position of the keyway, the measurement error is relatively large. And it is also inconvenient to use a vernier caliper or a depth gauge to measure.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a crankshaft semicircular keyway depth detection tool with reasonable structure, simple manufacture, convenient operation, high detection efficiency and reliable and accurate measurement.

The technical solution adopted by the present invention to solve the above technical problems is: a tool for detecting the depth of the semicircular keyway of the crankshaft, which includes a base, a depth dial indicator, and a fixing screw, and is characterized in that: a circular through hole is vertically arranged in the middle of the base , a screw hole is provided on the side, and the bottom surface of the base is an arc surface, which coincides with the surface of the crankshaft journal where the semicircular keyway of the crankshaft is located; the measuring rod of the depth dial indicator is inserted into the circular through hole, The side is pressed and fixed by fixing screws and screw holes.

When the present invention is in use, hold the base of the detection tool, engage the circular arc surface of the base together with the measuring head of the depth dial indicator on the surface of the crankshaft journal corresponding to the semicircular keyway of the crankshaft, and record the reading of the depth dial indicator . Then the arc surface of the base continues to stick to the surface of the journal, and moves to the position of the semicircular key groove. The measuring head of the depth dial indicator extends out of the circular through hole and reaches the bottom of the semicircular key groove, and writes down the reading of the depth dial indicator again. . The difference between the two measurement readings is the depth of the crankshaft semicircular keyway. Allows for convenient and accurate depth measurement.

In the invention, a base matching the surface of the crankshaft journal where the semicircular key groove of the crankshaft is located is provided, and the base is an engaging body for the detection tool to cooperate with the crankshaft. Moreover, bases of different specifications can be made according to the size of the crankshaft journal. Compared with the prior art, the invention has the advantages of simple structure, convenient and reliable use, accurate depth measurement and rapid measurement. It is an ideal testing tool for the depth of the half-circle keyway of the crankshaft, and is suitable for measuring the depth of the half-circle keyway or flat keyway of various shafts.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is a schematic front view of an assembly structure in a measuring state of the present invention.

Fig. 2 is a schematic left view of an assembly structure in another measuring state of the present invention.

The labels in the figure are: 1. Depth indicator, 2. Fixing screw, 3. Base, 4. Crankshaft.

Detailed ways

Fig. 1 is a schematic front view of the assembly structure of the measuring head of the present invention when it reaches the bottom position of the semicircular keyway. Fig. 2 is a schematic left view of the assembly structure of the measurement state when the measuring head of the present invention contacts the surface of the journal where the semicircular key groove is located.

As can be seen from Fig. 1 and Fig. 2, a crankshaft semicircular keyway depth inspection tool includes a base 3, a depth indicator 1, and a fixing screw 2. Fitting snap body. The middle of the base 3 is vertically provided with a circular through hole, and the side is provided with a screw hole. The bottom surface of the base 3 is an arc surface, which coincides with the surface of the crankshaft 4 journal where the semicircular keyway of the crankshaft is located; the depth The measuring rod of the dial indicator 1 is inserted into the circular through hole, and the side is pressed and fixed by the fixing screw 2 and the screw hole.

When the present invention is in use, hold the base 3 of the detection tool, and engage the arc surface of the base 3 together with the measuring head of the depth dial indicator 1 on the surface of the journal of the crankshaft 4 corresponding to the semicircular keyway of the crankshaft, as shown in Figure 2 Note down the reading of the depth indicator 1. Then the arc surface of the base continues to stick to the surface of the journal, and moves to the position of the semicircular keyway. The measuring head of the depth indicator 1 can extend out of the circular through hole and reach the bottom of the semicircular keyway, as shown in Figure 1, again Note down the reading of the depth indicator. The difference between the two measurement readings is the depth of the crankshaft semicircular keyway.

The invention has simple structure, convenient and reliable operation, and can realize convenient and accurate depth measurement. Bases of different specifications can be made according to the size of the crankshaft journal, and it is suitable for measuring the depth of various shaft semicircular keyways or flat keyways.

Claims (1)

1. A crankshaft semicircular keyway depth detection tool, which comprises a base, a depth dial indicator, and a set screw, is characterized in that: a circular through hole is vertically provided in the middle of the base, a screw hole is provided on the side, and the bottom surface of the base It is an arc surface, and the arc surface coincides with the surface of the crankshaft journal where the semicircular keyway of the crankshaft is located; the measuring rod of the depth dial indicator is inserted into the circular through hole, and the side is pressed together by the fixing screw and the screw hole fixed.

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