Measuring instrument for guide pipe hole coaxiality/valve seat ring roundness of valve seat of cylinder cover of engine

Abstract

The invention belongs to the technical field of engines and relates to a measuring instrument for guide pipe hole coaxiality / valve seat ring roundness of a valve seat of a cylinder cover of an engine. The measuring instrument comprises a valve seat shell. A spindle is rotatably arranged in a shaft hole of the valve seat shell. The front end of the spindle extends out of the valve seat shell to be fixedly connected with a fixing sleeve along the diameter of the spindle. A connecting copper sleeve is arranged in an inner chamber of the fixing sleeve and connected with a swing ring. A probe is connected with the swing ring. Two fixing points and an elastic point are formed on the same section of the rod-shaped structure of the probe. The middle of the probe is provided with a guide pipe air nozzle. The front end of a probe base is provided with a valve seat air nozzle. By the use of the measuring instrument, the valve seat automatically rotates and calculates while measuring the guide pipe hole coaxiality and the valve seat roundness. Compared with the three-coordinate measuring method and mechanical measuring method, the measuring instrument is more quick and accurate.

Description

technical field [0001] The invention relates to an engine cylinder head valve seat to guide hole runout / seat ring circle measuring instrument, which is used for measuring the coaxiality of the valve seat ring guide hole and the roundness of the valve seat; it belongs to the technical field of engines. Background technique [0002] The processing accuracy of the valve seat ring hole of the cylinder head directly affects the sealing performance, power performance and fuel consumption of the engine. [0003] At present, the existing cylinder head valve seat uses three methods to detect the coaxiality of the conduit hole and the roundness of the valve seat: 1. Three-coordinate detection, which takes a long time to detect and has poor accuracy. [0004] 2. Select a mandrel that is 0.003-0.005 smaller than the inner diameter of the processed conduit hole for positioning, rotate 360 ​​degrees, and read the change value of the dial gauge, which is the coaxiality. This method has ma...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a simple in structure, ingenious, reasonable engine cylinder head valve seat to conduit hole beating / seat circle measuring instrument, the measuring head of the gauge body can be rotated, can It is a measuring instrument that realizes the detection of the coaxiality of the valve seat to the conduit hole and the roundness of the valve seat. By replacing the quick-change special pneumatic probe (the parts in contact with the workpiece are made of hard alloy materials), the shortcoming of the short life of the pneumatic probe is overcome. ), realizing the production and testing of multiple varieties in turn

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