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Ball bearing for ram air turbine gearbox

A ram air and gear box technology, applied in the field of ball bearings, can solve problems such as the influence of life mismatch of roller bearings

Inactive Publication Date: 2012-04-04
HAMILTON SUNDSTRAND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the life of roller bearings can be susceptible to the mismatch inherent in this application

Method used

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  • Ball bearing for ram air turbine gearbox
  • Ball bearing for ram air turbine gearbox
  • Ball bearing for ram air turbine gearbox

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] An exemplary ram air turbine (RAT) 12 for an aircraft 10 is figure 1 is shown in the deployed position. The RAT 12 includes a generator 16 that is pivotally supported by a mounting structure 14 that is secured to the aircraft 10 . A strut 18 extends from the generator 16 and supports a gearbox 20 . Turbine blades 22 are rotationally driven by airflow in the deployed position and drive generator 16 through gearbox 20 .

[0009] see figure 2 , the gearbox 20 includes an input shaft 24 mounted for rotation within a housing 30 constructed of aluminum. Turbine blades 22 are fixed to a hub 26 disposed on input shaft 24 . Ring gear 28 is operatively mounted on input shaft 24 and is coupled to pinion gear 32 , which is operatively mounted on pinion shaft 34 .

[0010] The pinion shaft 34 includes upper and lower shaft portions 36 , 38 disposed on each side of the pinion 32 . The upper and lower shaft portions 36 , 38 each include an outer diameter supported for rotation ...

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Abstract

The invention relates to a ball bearing for a ram air turbine gearbox. Specifically, the ram air turbine gearbox includes a pinion shaft arranged in a housing and operatively supports a pinion gear. An input shaft is arranged in the housing and operatively supports a ring gear coupled to the pinion gear. The input and output shafts are oriented at an angle. A rolling element bearing supports the pinion shaft in the housing and includes inner and outer races between which a multiple ball bearings are arranged. Each ball includes a ball diameter. The inner and outer races respectively include inner and outer raceway radii and inner and outer raceway depths. The inner and outer raceway radii each are approximately 52% of the ball diameter. The inner raceway depth is at a minimum 25% of the ball diameter, and the outer raceway depth is at a minimum 20% of the ball diameter.

Description

technical field [0001] The present disclosure relates to ram air turbine gearboxes, and more particularly to ball bearings for use in ram air turbine gearboxes. Background technique [0002] The ram air turbine gearbox transfers the torque from the turbine to the point of use of the power. The gearbox includes an input shaft, to which the turbine is connected, and an output shaft, which interconnects the input shaft and the point of use of the power. In some applications, the surface geometry of the mating gear teeth will create non-radial loads to which the bearing will contribute. Typical ball bearings may not be suitable for this configuration, so that a roller bearing is usually required to accommodate radial loads and an additional pair of larger and different ball bearings is required to act on axial loads. For gearbox applications where the space available for bearings is very limited, it may be necessary to use roller bearings, preventing the need to use the typica...

Claims

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Application Information

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IPC IPC(8): F16C19/02F16C33/58F16H57/021
CPCF16H57/021F16C2240/76F16C2240/70F16C2240/46F16C33/585F16C2326/43B64D41/007Y10T74/19642Y10T29/53104
Inventor S.M.博尔托利
Owner HAMILTON SUNDSTRAND CORP