Piston top dead center automatic detecting and positioning device of reciprocating machinery

Abstract

The invention discloses a piston top dead center automatic detecting and positioning device of reciprocating machinery. The device is characterized in that a displacement sensor is arranged at the position of an oil nozzle in a cylinder sleeve above a piston; the gear of a step motor is engaged with a flywheel ring gear of an engine; the signal output of the displacement sensor is connected to the input end of a controller; and a drive power wire of the step motor is connected to the output end of the controller. The system has a simple structure, and has the advantages of accurate positioning and short response time as compared with a visual observation method, so that the piston top dead center position of the reciprocating machinery is accurately positioned in a visual and digitized way. Single cylinder engine tests prove that the device can effectively improve the position accuracy of the piston top dead center, and the debugging process cannot influence the assembling process. The device is also suitable for piston positioning of other reciprocating machinery.

Description

technical field [0001] The invention belongs to the technology of internal combustion engines, and in particular relates to a system device for accurately positioning the position of the top dead center of an engine piston. Background technique [0002] The manufacturing accuracy and installation accuracy of the reciprocating mechanical piston is one of the main processes reflecting the quality of the engine manufacturer, especially in the installation process of the piston, the precise control of the top dead center of the piston is crucial to the performance of the reciprocating mechanical effect. Because the position accuracy of the top dead center of the piston directly affects the installation accuracy of the cam mechanism and the valve mechanism, it is very critical to the fuel injection timing. With the application of electronic control, HCCI, variable valve timing and other high-tech in engine design and production, the assembly precision of the engine is increasing...

AI Technical Summary

Problems solved by technology

At present, the inspection of the top dead center of the piston mainly relies on visual inspection or empirical debugging, so the installation accuracy of the piston cannot be guaranteed, because small errors will have a great impact on the compression ratio of the engine.

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