Spiral bevel gear set for ram air turbine
AssigneeHamilton Sundstrand Corporation
InventorStephen Michael Bortoli
Life of this patent
Estimating the term…
Abstract
A ram air turbine (RAT) assembly includes a gearbox that supports a gear set with a ring gear that drives a pinion gear. The gear set provides for the transmission of power from the turbine to a generator, pump or other power conversion device. A turbine shaft supports the ring gear and a pinion shaft that rotates about an axis transverse to the turbine shaft supports the pinion gear. A ratio between a face width and a diametrical pitch of the gear set is within a desired ratio that provides sufficient space for supporting bearing assemblies while providing for operation within the physical constraints and desired performance requirements of the RAT.
Claims14
A gear set for a ram air turbine, the gear set comprising:
- a ring gear supported on a drive shaft driven by a turbine;
- a pinion gear driven by the ring gear, the pinion gear driving a pinion shaft, wherein each of the ring gear and the pinion gear include a diametrical pitch and a face width with a ratio between the diametrical pitch and the face width for both the ring gear and the pinion gear being within a range between 11.48 and 11.85 and wherein a ratio of a distance between a pitch apex and pinion gear crown and a distance between the pitch apex and a ring gear crown is within a range between 1.34 and 1.60.
A ram air turbine assembly comprising
- a turbine driving a drive shaft;
- a gearbox supporting the drive shaft and a pinion shaft;
- a ring gear supported within the gearbox on the drive shaft;
- and
- a pinion gear supported within the gearbox on the pinion shaft, wherein each of the ring gear and the pinion gear include a diametrical pitch and a face width with a ratio between the diametrical pitch and the face width for both the ring gear and the pinion gear being within a range between 11.48 and 11.85 and wherein a ratio of a length between a pitch apex and a pinion gear crown parallel to an axis of rotation of the pinion gear and a length between the pitch apex and a ring gear crown parallel to an axis of rotation of the ring gear is within a range between 1.34 and 1.60.
A method of installing a gear set within the ram air turbine assembly comprising the steps of:
- mounting a pinion gear within a gearbox of a ram air turbine assembly;
- and
- mounting a ring gear in meshing engagement with the pinion gear within the gearbox, wherein each of the ring gear and the pinion gear include a diametrical pitch and a face width with a ratio between the diametrical pitch and the face width for both the ring gear and the pinion gear being within a range between 11.48 and 11.85 and a ratio of a length between a pitch apex and a pinion gear crown parallel to an axis of rotation of the pinion gear and a length between the pitch apex and a ring gear crown parallel to an axis of rotation of the ring gear is within a range between 1.34 and 1.60.
Dependencies are inferred from the claim text.