Measuring device for friction force between oil nozzle and needle valve

Abstract

The invention relates to a device for measuring the frictional force between an oil nozzle and a needle valve, and the device is characterized in that the device comprises a force sensor, a support, a vibration test bench, and a needle valve clamping tool; the top surface of the vibration test bench is provided with the needle valve clamping tool; the needle valve clamping tool is used for clamping the needle valve; the upper end of the needle valve is in cup joint with the oil nozzle; the upper end of the oil nozzle is rigidly connected with the force sensor; the force sensor is disposed at the bottom of the support; the height of the support can be adjusted so as to enable the reading, caused by gravity, of the force sensor to be zero; the vibration test bench drives the needle valve to move up and down, so as to simulate the movement state of the needle valve of an oil injector in an actual work process; the force sensor measures the frictional force between the needle valve and the oil nozzle. The device is simple in structure, and employs the vibration test bench to simulate the movement state of the needle valve, so as to measure the frictional force between the needle valve and the oil nozzle, and provide more accurate boundary conditions for the subsequent design and development of the oil injector, simulation and calculation, and characteristic research of fuel oil.

Description

technical field [0001] The invention relates to a measuring device, in particular to a measuring device for the friction force between a fuel nozzle and a needle valve, and belongs to the technical field of fuel injector design and development. Background technique [0002] The injection law of the common rail diesel engine has a direct impact on the economy, power and emission of the diesel engine. The friction between the nozzle and the needle valve is an important parameter for studying the injection law of the common rail injector, and it is also an important factor for analyzing the force. one of the parameters. It conducts qualitative measurement and analysis on the needle valve lift, opening delay, closing delay, and motion state of the injector, and understands the motion of the common rail injector nozzle in actual work, which has very important practical significance, and It can provide more accurate boundary conditions for later fuel injector design and developme...

AI Technical Summary

Problems solved by technology

[0003] However, due to the special structure of the injector (the nozzle and the needle valve are assembled inside the injector), the conventional friction measurement method cannot measure the friction force between the nozzle and the needle valve. It is desired to directly measure the friction between the nozzle and the needle valve at the nozzle end. Force is quite difficult, and so far there is no ready-made device that can be used to measure the friction between the nozzle and the needle valve

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