The Research And Development Of Type TYQ78 Hydraulic Governor

A hydraulic governor is the key part of the marine diesel engine. Its core technology has been monopolized by a few foreign corporations for a long time. Many diesel engine factories at home have to import the expensive governors, which elevators the marine engine's manufacturing cost and operation cost. On the other hand, the marine diesel engines market has been hot up in recent years because of the shipbuilding market's fast growth. It's more important that almost all governors on our naval vessels are from abroad, which will be a big problem to our national safety in the future. Therefore we must strive to research and develop our hydraulic governors of independent knowledge property right to meet the present great challenge.Thi(?) paper introduces the diesel engine and the governor development history and their present status. The hydraulic governor basic theories are expounded in detail so that the research and development of type TYQ78 hydraulic governor are worked smoothly.Type TYQ78 hydraulic governor is different from the other governors at home:·Work outputs is more than 78N·m, and maximum torque outputs is up to 150 N·m;·A pneumatic speed setting mechanism applied to adjust the governor speed setting remotely;·The governor uses SAE standard input and output shafts, which can exchange with the governors abroad without any altering;·A booster servomotor (the pressure ratio of oil out to air in is 2:1) is optional to start the engine under the extreme conditions.The type TYQ78 sample hydraulic governors have carried out a series of performance tests according to the diesel engine governing specifications. It has matched successfully with an 8PC2-6 diesel engine. It has fulfilled 1)starting test on the cold engine,2)speed governing characteristic test,3)propelling characteristic test,4)steady-speed band test,5)abrupt speed increasing and decreasing test, 6)abrupt load increasing and decreasing test, and etc. All static and dynamic parameters are satisfactorily up to the standards of model 8PC2-6 marine diesel engine governing specifications. The sequent marine performance test and 3000h reliability test of type TYQ78 hydraulic governor have proved that the governor responds rapidly, operates stably and adjusts accurately in the respective governing process, which is of the same level in the world.The study proved that type TYQ78 hydraulic governor is advanced in design, rational in process, innovative in conception and has a good prospect of application and promotion. At the same time the governor has applied and obtained the patent in People's Republic of China whose patent number is 200620036666.2.