专利汇可以提供SPIRAL BEVEL GEAR SET FOR RAM AIR TURBINE专利检索,专利查询,专利分析的服务。并且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 provide for operation within the physical constraints and desired performance requirements of the RAT.,下面是SPIRAL BEVEL GEAR SET FOR RAM AIR TURBINE专利的具体信息内容。
What is claimed is:
This disclosure generally relates to a ram air turbine assembly. More particularly, this disclosure relates to a gear box of a ram air turbine assembly for transferring torque from a turbine to a generator or pump.
A ram air turbine (RAT) is deployable to generate power when sufficient primary power generation is not available. A RAT includes a turbine that is deployed into an airstream along the aircraft. Rotation of the turbine drives a generator or hydraulic pump. The generator or pump can be mounted at a pivot point of the RAT that is a distance from the turbine deployed within the airstream. Accordingly, a drive arrangement including a gearbox is utilized to transfer power from the turbine to the generator or pump. The drive arrangement includes a gearbox that provides a desired speed and direction for driving the generator or pump. Gears, shafts and other drive components are constrained by limitations in the desired size, weight, and power generation of the RAT.
A disclosed example ram air turbine (RAT) assembly includes a gearbox that supports a gear set with a ring gear that drives a pinion gear. The gearbox 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 is driven by the pinion gear. A forward bearing and a rear bearing are disposed on opposite sides of the pinion gear to support rotation. The forward bearing is disposed within a distance between a pinion gear crown and a pitch apex of the gear set. Further, a disclosed example embodiment includes a face width of the gear set that is related to the diametrical pitch according to a desired ratio.
These and other features disclosed herein can be best understood from the following specification and drawings, the following of which is a brief description.
Referring to
Referring to
The ring gear 34 and the pinion gear 36 are spiral beveled gears that mesh to provide the desired transmission of power from the turbine shaft 26 to the pinion shaft 38 and finally to the example generator 22. The number of teeth on each of the ring gear 34 and the pinion gear 36 are determined to provide the desired speed of the pinion shaft 38 responsive to the input of the turbine shaft 26 to drive the generator 22.
Engagement between the ring gear 34 and the pinion gear 36 transfers torque from the turbine 16 to the generator 22 located at the pivot point of the RAT 10. The meshing engagement between the ring gear 34 and the pinion gear 36 is configured to withstand varying torque loads produced during operation.
During operation transferred torque will vary and result in a condition known as torque ripple. Torque ripple is a function of the structural natural frequencies of the RAT 10 driveline from the turbine 16 through to the generator 22. The example gear set 54 includes features that accommodate expected torque ripple and any extra loading. Furthermore, variations in part fabrication and assembly can result in some relative movement between the ring gear 34 and the pinion gear 36. Moreover, variations in operating loads and temperatures coupled with necessary component clearances can also result in relative movements. Such movements and variations are accommodated in the design of the mating ring gear 34 and pinion gear 36.
The forward bearing 42 and the rear bearing 44 are disposed on opposite sides of the pinion gear 36 to support rotation about the axis 40. The forward bearing 42 is disposed within a distance 46 between a pinion gear crown 48 and the pitch apex 52 of the gear set 54. Further the forward bearing 42 is disposed within the distance 56 between ring gear crown 50 and the pitch apex 52. The pitch apex 52 of the gear set 54 is that point where the turbine shaft axis 28 and the pinion shaft axis 40 intersect.
Referring to
In one example embodiment, a ratio between the number of gear teeth 82 of the ring gear 34 is related to the number of gear teeth 80 on the pinion gear 36 is approximately 2. In one example dimensional embodiment, the pinion gear 36 includes twenty-three teeth 80 and the ring gear 34 includes fifty teeth 82.
In this example embodiment the face width 60 of both the pinion gear 36 and the ring gear 34 is related to the diametrical pitch according to a ratio within a range between 11.48-11.85. This ratio provides the desired meshing engagement between the corresponding gear teeth 80, 82 while still providing the clearance for the forward bearing assembly 42. As appreciated, the specific gear ratio is determined according to application specific requirements given the input of the turbine, the output requirements and the power requirements for driving the generator, pump or other power generating device.
Referring to
Moreover, the mounting distance is also a function of the angular relationship between the pinion shaft 38 and the turbine shaft 26. The pinion shaft 38 rotates about the axis 40 at an angle 70 relative to the axis 28 of the turbine shaft 26. In this example, the angle 70 is between 70° and 73°. In another disclosed non limiting dimensional example, the angle 70 is approximately 71 degrees. However, other angles as may be required to conform to application specific requirement are also within the contemplation of this disclosure.
Referring to
Each of the pinion gear 36 and the ring gear 34 include a spiral angle 84. The spiral angle 84 is the angle of the corresponding gear teeth 80, 82 relative to the pitch cone. The spiral angle 84 is configured to provide a desired transfer of power and torque. The spiral angle 84 is common to both the pinion gear 36 and the ring gear 34. In this example, the spiral angle 84 is related to the shaft angle 70 (Best shown in
The gear set 54 is further described according to a ratio between a pitch diameter 76 of the pinion gear 36 and a pitch diameter 78 of the ring gear 34. In one non-limiting embodiment, the pitch diameter 76 of the pinion gear 36 is related to the pitch diameter 78 of the ring gear 34 as a ratio within a range between 0.41 and 0.50. This ratio of the pitch diameters 76, 78 provides the desired configuration to fit within the dimensional constraints of the gearbox 20 while still providing the desired torque transmission and other performance requirements.
Referring back to
The example gear set 54 is configured such that the diametrical pitch is related to the face width 60 of the ring and pinion gears 34, 36 according to a desired ratio. In this example method the diametrical pitch and face width 60 are related according to a ratio within the range between 11.48-11.85. The method of installing the example gear set 54 further includes mounting the pinion gear 36 for rotation about the axis 40 that is disposed at an angle between 70-73° from the axis of rotation 28 of the turbine shaft 26.
The disclosed example gear set 54 for the RAT 10 accommodates torque ripple to provide extending the gear life while also providing necessary margins for other load states. The pinion gear 36 is supported by the forward bearing assembly 42 in a position that is provided by the disclosed example face width 60 and diametrical pitch relationship of the disclosed example gear set 54. The disclosed relationship provides for the desired gear set 54 to operate within the physical constraints and desired performance requirements of the example RAT 10.
Although an example embodiment has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this disclosure. For that reason, the following claims should be studied to determine the scope and content of this invention.
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