Sensor and method for measuring contact force of engine cam tappet

Abstract

The invention provides a sensor and method for measuring the contact force of an engine cam tappet. The sensor comprises a force bearing element, a force transmission element, a piezoelectric element, a force loading element, a tappet head and a guiding woodruff key; a force transmission threaded hole is formed in one end face of the force bearing element; one end face of the force transmission element is provided with a force transmission bolt which is matched with the force transmission threaded hole of the force bearing element, and four threaded holes are evenly formed in the other end face of the force transmission element in the circumferential direction at intervals; the piezoelectric element is an annular sensitive element made of a piezoelectric crystal; the force loading element is provided with four through holes which are uniformly arranged at intervals in the circumferential direction; and the tappet head comprises a large arc-shaped groove, a small semi-spherical groove, three wire outlet holes and a key groove. The invention also provides a method for measuring by using the sensor, the mechanism is simple, the use is convenient, and the measurement of the contact force of the cam tappet in the normal direction, the tangential direction and the axial direction of the contact surface can be realized.

Description

technical field [0001] The invention relates to a sensor and a measuring method for measuring the contact force of an engine cam tappet, belonging to the technical field of engine performance detection. Background technique [0002] Internal combustion engine, as the thermal power equipment with the largest amount and widest application, is widely used in industry, agriculture, transportation and national defense construction, and is the main power of automobiles, ships, construction machinery and backup power stations and other devices. If the vibration and noise of the internal combustion engine are not well controlled, it will not only affect the working efficiency of the internal combustion engine, but also cause the related power equipment to fail to work normally. As one of the important sources of vibration and noise in internal combustion engines, the valve train's performance directly affects the stability, reliability and life of the internal combustion engine. It...

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Problems solved by technology

[0003] The contact force of the cam tappet is one of the main sources of vibration and noise of the gas distribution mechanism of the internal combustion engine, and it is also an important evaluation index in the optimization design of the cam profile and the performance check of the gas distribution mechanism. The simulation calculation technology for the contact force of the cam tappet It has become more and more mature. In the related research of gas distribution mechanism, test verification and test analysis are also indispensable steps. In these two aspects, the direct measurement of the contact force of the cam tappet is still a big problem. The main reason is that the camshaft and the tappet The working space between the columns is also relatively narrow, and it is difficult to arrange conventional measurement methods such as strain gauges on them

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