The American F100 engine adopts a hybrid transmission scheme. The intermittently operated high-power fuel afterburner pump is driven by the gas turbine, and the tail nozzle is driven by the speed-regulating air motor. The transmission accessory is placed in the engine body as much as possible, directly driven by the spindle, and externally driven only. A small number of attachments. This design is not only small in size and light in weight, it may arrange non-mechanical transmission accessories in the shielding area of ​​the mechanical transmission accessories, reducing the windward area of ​​the engine and reducing the load on the mechanical transmission. Its accessory drive cylindrical gear has a line speed of 114m/s and a bevel gear of 173m/s.
Due to the high speed and the pursuit of light weight, the integrated design of gear teeth, rims and webs is emphasized in the design, and the dynamic characteristics of the gears are emphasized. The strength calculation relies on obtaining experimental data and finite element calculations through test methods. Get precise stress levels. Gear materials have developed in the direction of high temperature and high strength, and a series of new gear materials have been developed.
In order to prevent the boundary lubrication from scratching the tooth surface and reducing the surface contact stress, silver is plated on the tooth surface, and other tooth surface modification studies have also made great progress. Main bearing cavity seal The main bearing cavity of the engine should be effectively isolated from the air flow to prevent the lubricating oil from flowing out of the cavity and avoid overheating of the bearing cavity and deterioration of the lubricating oil. Early military engines used cavities, metal risers and floating ring seals.
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