General Electric. has been granted a patent for a turbomachine engine featuring a high-pressure compressor, turbine, and a low-pressure shaft. The design allows operation up to a specified redline speed without encountering critical speed issues, with specific parameters defined for the shaft’s midshaft rating and length. GlobalData’s report on General Electric gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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Turbomachine engine with specific low-pressure shaft characteristics
The patent US12071978B2 describes a turbomachine engine designed for enhanced performance and efficiency. The engine comprises a core that includes a high-pressure compressor, a high-pressure turbine, and a combustion chamber, all in flow communication. A notable feature is the low-pressure shaft, which is coupled to a power turbine and has a midshaft rating (MSR) ranging from 200 to 300 ft/sec. The design allows the engine to operate at redline speeds between 50 and 250 ft/sec without encountering critical speeds associated with the first-order bending mode of the low-pressure shaft. The engine core length (LCORE) is specified to be between 43 and 80 inches, with the exit stage diameter (DCORE) ranging from 13 to 41 inches.
Additional claims detail the construction and operational parameters of the turbomachine engine. The power turbine can have between four to six stages, and the use of ceramic matrix composite (CMC) materials is specified for the turbine. The length of the low-pressure shaft (LMSR) is defined by the engine core length and additional lengths to the bearings. The high-pressure shaft is characterized by specific ratings and RPM ranges, ensuring optimal performance. The engine may also include an electric machine coupled to the low-pressure shaft and a primary fan driven by the power turbine through a gearbox assembly. The flex coupling connecting the gearbox to the low-pressure shaft is designed with specific stiffness characteristics. The operational method outlined in the patent emphasizes generating thrust while maintaining the low-pressure shaft's linear speed below 300 ft/sec, ensuring efficient and reliable engine performance.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
