Tool for measuring roundness error of cylinder hole of engine cylinder body

Abstract

The invention discloses a tool for measuring a roundness error of a cylinder hole of an engine cylinder body, and the tool comprises an auxiliary cylinder and a measuring assembly. A side wall of the auxiliary cylinder is provided with three groups of through holes in the axial direction at intervals, wherein the central axis of each through hole of each group of through holes is parallel to the radial direction of the auxiliary cylinder. The auxiliary cylinder can be placed in a to-be-measured cylinder hole, and can rotate along the cylinder hole. The measuring assembly comprises an outside micrometer, and the outside micrometer is detachably connected with the auxiliary cylinder. A measuring rod of the outside micrometer can cooperate with each group of through holes. During use, the tool sequentially measures the side wall surfaces of the cylinder holes corresponding to the three groups of through holes, and selects the group with the maximum difference from three groups of data as the roundness error value of the to-be-measured cylinder hole. The auxiliary cylinder is used for the measurement of three groups of data, so the tool can accurately analyze the variation trend consistency information of a machining error of the cylinder hole. Moreover, the tool provided by the invention is simple in structure, facilitates the batch detection, and reduces the cost of the enterprise.

Description

technical field [0001] The invention relates to the technical field of engine detection, in particular to a tool for measuring the roundness error of an engine block cylinder hole. Background technique [0002] At present, the requirements for energy saving and emission reduction of automobiles are getting higher and higher, and the engine plays a vital role in this respect. The cylinder hole located inside the cylinder block of the engine is an important part of the combustion chamber of the engine, and the fuel is in the cylinder hole Combustion pushes the piston and crankshaft, and then drives the entire engine system to work. [0003] The processing quality of the cylinder bore directly affects the assembly accuracy of the piston assembly. If the quality of the cylinder bore is not up to standard, it will seriously affect the working performance of the engine, resulting in the locking of the piston, which will cause the entire engine to be scrapped. Among them, the roun...

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Problems solved by technology

[0003] The processing quality of the cylinder bore directly affects the assembly accuracy of the piston assembly. If the quality of the cylinder bore is not up to standard, it will seriously affect the working performance of the engine and cause the piston to lock, thus causing the entire engine to be scrapped

Among them, the roundness error of the cylinder bore belongs to the shape and position error, and the machining process is complicated, so the measurement requirements are particularly strict. At present, the three-coordinate measuring instrument is generally used to detect the roundness error. The three-coordinate measuring instrument has high precision, but it is very troublesome to operate. , which belongs to offline detection

It can still be used for small batch trial production, but for batch production line processing, it is unrealistic to perform three-coordinate inspection one by one. demand, which increases the production input of enterprises

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