FIELD: engines and pumps.
SUBSTANCE: fan section contains a fan which is rotatable about an axis. A reducer interacts with a fan, wherein the mentioned reducer comprises a planetary gear of a fan drive with a gear ratio of the planetary gear of at least 2.5 and less or equal to 5.0. The bypass ratio of the engine lies in the range from 11.0 to 22.0. The planetary gear contains a sun pinion, a lot of satellite pinions, a crown pinion and a pinion cage. Each of the plurality of satellite pinions comprises at least one bearing. The crown pinion is fastened to prevent rotation. The low pressure turbine is mechanically attached to the sun pinion. The fan section is mechanically attached to the pinion cage. The fan blade tip speed is less than 1,400 feet per second.
EFFECT: ways to increase the thermal, traction efficiencies and transmission efficiency are achieved by reducing the load on its bearings and pinions.
7 cl, 3 dwg
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