公开(公告)号：US20210122464A1

公开(公告)日：2021-04-29

申请号：US16661118

申请日：2019-10-23

Applicant: Bell Textron Inc.

Inventor： Colton James Gilliland ,  Russell Lee Mueller ,  Tyson T. Henry

IPC: B64C29/00 ,  F16H1/36 ,  F16H57/08 ,  F16H57/02 ,  B64D35/04

Abstract: A drivetrain for an aircraft includes an engine, a driveshaft receiving rotational energy from the engine and a gearbox including a planetary gear system receiving rotational energy from the driveshaft. The planetary gear system includes a sun gear, planet gears, a ring gear and an integral carrier forming flexured carrier posts. Each flexured carrier post supports a respective one of the planet gears and has a fixed proximal end and a cantilevered distal end. The planetary gear system includes flexured roller races, each having a fixed end and a cantilevered end. The fixed end of each flexured roller race is coupled to the cantilevered distal end of a respective flexured carrier post. The planet gears engage with the flexured roller races to rotate about the flexured carrier posts. The cantilevered ends of the flexured roller races experience cantilevered motion to absorb loads from the planet gears.

公开(公告)号：US20210107671A1

公开(公告)日：2021-04-15

申请号：US16599687

申请日：2019-10-11

Applicant: Bell Textron Inc.

Inventor： Colton James Gilliland ,  Russell Lee Mueller ,  Tyson T. Henry

IPC: B64D35/04 ,  F16H3/64 ,  F16H57/02 ,  B64C29/00 ,  B64C27/28

Abstract: A drivetrain for an aircraft includes an engine, a driveshaft to receive rotational energy from the engine and a gearbox including a multistage planetary gear system to receive rotational energy from the driveshaft. The multistage planetary gear system includes an integral multistage ring gear system having flanged and cantilevered ends. The integral multistage ring gear system forms a first stage ring gear at the cantilevered end and a second stage ring gear interposed between the flanged end and the first stage ring gear. The multistage planetary gear system includes a first stage sun gear, first stage planet gears and a first stage carrier. The first stage planet gears mate with the first stage ring gear. The multistage planetary gear system includes a second stage sun gear, second stage planet gears and a second stage carrier. The second stage planet gears mate with the second stage ring gear.