Device and method for measuring distance between snap ring grooves on pin holes of pistons

Abstract

The invention discloses an interval measuring device and method for clamping annular grooves in a pin hole of a piston. The interval measuring device comprises a measuring part. The measuring part comprises a body. A first measuring base is arranged at one end of the body. A first measuring flange is arranged on the first measuring base and contained in the lower portion of one clamping annular groove, and the inner side face of the first measuring flange is connected with the inner side face of the clamping annular groove in an abutting mode. A center shaft is arranged on the body. A vernier block is arranged on the center shaft in a sliding mode. A second measuring base is arranged on the vernier block. An annular second measuring flange is arranged on the second measuring base. The outer diameter of the second measuring flange is the same as that of the first measuring flange. The second measuring flange is contained in the lower portion of the other clamping annular groove, and the inner side face of the second measuring flange is connected with the inner side face of the clamping annular groove in an abutting mode. According to the interval measuring device and method for the clamping annular grooves in the pin hole of the piston, the first measuring flange and the second measuring flange are similar to the clamping annular grooves in shape and make plane contact with the clamping annular grooves, and measuring precision is improved.

Description

technical field [0001] The invention relates to the field of engines, in particular to a device and method for measuring the distance between snap ring grooves on a pin hole of a piston. Background technique [0002] The internal combustion engine piston is symmetrically provided with two piston pin holes, and the inner wall of each piston pin hole is provided with a snap ring groove. The distance between the two snap ring grooves is an important parameter of the piston manufacturing quality. In the prior art, common vernier calipers or go-no-go gauges of specific sizes are generally used to measure the distance between piston pin holes and snap ring grooves. [0003] The main scale of ordinary vernier calipers is not rigid enough and is easily damaged. And the matching gap between the vernier and the main ruler is relatively large, and the measuring area of ​​the measuring claw of the vernier caliper is relatively small. Use a vernier caliper to measure the arc surface of...

AI Technical Summary

Problems solved by technology

[0003] The main scale of ordinary vernier calipers is not rigid enough and is easily damaged

And the matching gap between the vernier and the main ruler is relatively large, and the measuring area of ​​the measuring claw of the vernier caliper is small

Use a vernier caliper to measure the arc surface of the snap ring groove, and the accuracy is low

In addition, the measuring jaws of the vernier caliper take up a lot of space and cannot measure the piston pin hole with a small diameter

For the situation where there are many types of piston products, and there are many specifications for the spacing of snap ring grooves and the width of snap ring grooves, it is very difficult to design all the go-no-go gauges of specific sizes, and the update cycle of piston design is short, and the design and production Go-no-go gauges of a specific size require less time and shorter service life, resulting in low utilization of go-no-go gauges

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