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Lubrication and cooling of a reduction gear with epicyclic gear train

A technology of gear devices and planetary gears, applied in gear lubrication/cooling, gear transmission devices, gas turbine devices, etc.

Active Publication Date: 2014-06-18
SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lubrication of the shafts and the meshing area of ​​the planetary gears, then, presents a problem which is solved in the prior art by a complex network of pipes used to deliver oil under pressure, using dynamic Seals or rotating joints that are subject to friction and require periodic inspection and replacement

Method used

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  • Lubrication and cooling of a reduction gear with epicyclic gear train
  • Lubrication and cooling of a reduction gear with epicyclic gear train
  • Lubrication and cooling of a reduction gear with epicyclic gear train

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Embodiment Construction

[0020] First refer to figure 1 , which is a schematic diagram of a known planetary reduction gear unit, the gear unit shown is installed on a turbine such as an aircraft turbojet engine, this engine has two coaxial counter-rotating propellers, and the turbine shaft 10 is connected via the planetary reduction gear unit 12 drives rotation. The gearing mainly comprises: a central or sun gear 14 forced to rotate with the turbine shaft 10, a fixed first outer ring 16 mounted on a fixed part 18 of the turbine, a movable first ring 16 fixed to the end of the shaft 22 to drive one of the propellers of the engine to rotate. Second outer ring 20. The shaft extends downstream and is guided in rotation by a bearing 24 on a stationary structural part 26 of the engine. The gearing also includes planetary gears 28 meshing with the central gear 14 , the stationary first outer ring 16 , and the movable second outer ring 20 . The planetary gears are mounted for free rotation on a planetary c...

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Abstract

A lubricating and cooling epicyclic stepdown gearing, for example in an aeroengine turbomachine, including a cylindrical casing mounted on a planet-carrier of the gearing and forming a centrifugal scoop surrounding stationary oil-delivery strips, the cylindrical casing including radial ducts feeding nozzles pointing towards zones where the planet gears mesh with outer ring(s) of the gearing.

Description

technical field [0001] The present invention relates generally to the lubrication and cooling of planetary reduction gear units, in particular turbines such as aircraft engines. Background technique [0002] The planetary reduction gear unit is suitable for transmitting high power. In a turbojet engine, it can be used to drive counter-rotating propellers through a shaft that rotates much faster than the propellers. [0003] Conventionally, a planetary gear set consists of a central or sun gear, an outer ring gear, and planetary gears meshing with the sun and ring gears, and of the three parts, the carrier of one of the parts must be prevented from rotating in order to Enable the gear unit to work. When the planet carrier is prevented from rotating, the central and ring gears are driving and driven respectively, and vice versa. Lubrication and cooling of the gear unit and the planetary shafts is thus no longer difficult and can be carried out by means of nozzles which do n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H57/04F16H1/36
CPCF16H57/0486F05D2260/40311F16H57/0456F02C3/107F16H57/0471F16H57/0427
Inventor 杰拉德·菲利普·高蒂尔瑟奇·雷内·莫瑞尔
Owner SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A