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Research Status and Development of Camshaft Geometrical Parameters Measurement Technology |
LIN Hu1,YANG Wu-wei1,2,XUE Zi1,YANG Guo-liang1 |
1. National Institute of Metrology, Beijing 100029, China
2. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China |
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Abstract The camshaft is one of the important parts of the engine, and its accurate measurement and error evaluation has always been the research focus of precision measurement. The current research status of camshaft geometry measurement technology and the specific instruments based on various measuring principles were introduced comprehensively. At present, the vertical camshaft measuring instruments with high accurate and multi-function are popular applied, and the optical non-contact measuring methods and instruments have a great prospect for development because of high measuring efficiency. Some key technical methods applied in cam measurement data processing and error evaluation are analyzed. Each method has advantages and disadvantages. Therefore, more suitable methods still need to be studied. A cam measuring method based on the principle of laser interferometry is proposed. The laser interference length measurement can be directly traced to the length reference “m”, which can improve the measurement accuracy of the cam. The calibration and unification of various camshaft measuring instruments are of importance in future. The JJF 1795-2020 Calibration specification for camshaft measuring instruments is released and implemented, which provides a unified reference method for the calibration and inspection of instruments. However, the evaluation for software algorithm is still currently lacked in domestic, so it is urgent to carry out relevant research work.
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