Double exhaust valve-valve retainer wearing testing apparatus and method thereof

Abstract

The invention discloses a double exhaust valve- valve retainer wearing testing apparatus and a method thereof, which solve the problems that the current testing apparatus is complex and is not accorded with the practical condition of an exhaust valve, and the testing apparatus has the advantages of simple structure, convenient dismounting, energy saving and environmental protection. The double exhaust valve-valve retainer wearing testing apparatus comprises a cylinder cover arranged on a testing stand, a double exhaust valve channel is arranged in the cylinder cover, an exhaust valve retainer is arranged at the bottom of the exhaust valve channel, a cam action execution mechanism is arranged at the top of the exhaust valve to drive the action of the exhaust valve; a cylinder body of the cylinder is simulated, the cylinder body is support by the testing stand, the top of the cylinder body and the bottom of the cylinder cover are communicated, an air intake is arranged at the cylinder body, and is connected with an inflation mechanism; a heating mechanism is arranged on the internal surface or external surface of the cylinder body, the cylinder body and the gas in the cylinder body are heated to the set temperature, the operation process of the cylinder is simulated, after multitime tests, the wearing of exhaust valve-valve retainer can be observed through naked eyes or a scanning electron microscope.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a double exhaust valve-valve seat wear test device and method. Background technique [0002] Valve-Valve Seat As the executive element of gasoline engine and diesel engine valve train, it is an important part to ensure the power performance, economic performance, reliability and durability of diesel engine. In a diesel engine, the exhaust valve-valve seat works in a high-temperature, high-pressure environment, and the working conditions are very harsh. They not only have to withstand high-speed frequent impacts, alternating tension and compression, and thermal stress, but also withstand the erosion of high-speed gas. This requires that the intake and exhaust valves should have crack resistance and wear resistance in addition to high temperature strength. Nowadays, with the further strengthening of diesel engines, the problem of valve-valve seat wear and fail...

AI Technical Summary

Problems solved by technology

[0003] If the valve-valve seat is worn, the valve sinks, the valve clearance disappears, the valve cannot be seated, the gas leaks out, the engine power decreases, and the use is affected; at the same time, the leaked gas may cause the valve seat to overheat or even ablate

Often after the gas distribution mechanism has problems and is improved, it is necessary to conduct a complete machine test, which consumes a lot of manpower and material resources. Therefore, there is a tendency to minimize the durability test of the complete machine and use more fast and repeatable devices.

The modern way to evaluate the wear characteristics of the valve-valve seat is the standard slip device or the impact-slip device. The above test methods only consider the wear resistance of the material, and do not take into account the real working conditions of the engine valve-valve seat. Considering that gas combustion is directly used on site, the polluted air is heavy, multiple tests are performed, and the economic cost is relatively high. Moreover, the existing fuel engine has multiple intake valves and exhaust valves in one cylinder, and the two exhaust valves are set at Under the complex working environment, there is mutual influence. If only one exhaust valve-valve seat is tested, the mutual relationship between the two is not considered. Therefore, the existing test does not match the actual fuel engine working conditions, and the test guidance significance Low

Images