A system for delivering pressurized lubricant fluids to an...

F - Mech Eng,Light,Heat,Weapons – 01 – D

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F01D 25/18 (2006.01) F16J 15/16 (2006.01) F16N 7/36 (2006.01)

Patent

CA 2333991

A system for delivering a pressurized lubricant fluid from a stationary source to an interior of a drive shaft of a gas turbine engine which rotates at high speed and operates at high temperatures is described. The pressurized lubricant fluid is delivered to a radial passage defined between a pair of axially spaced-apart seals (24) that surround the shaft (12). To ensure reliable operation under the high speed and high temperature conditions, the seals are constructed so that a film of the lubricant fluid is formed between the rotating shaft and the seals. The seals float on the film and wear is reduced. In order to minimize variations in th space between the seals and the shaft caused by changes in operating temperatures, each seal is surrounded by a control ring (56) of material having a coefficient of expansion similar to the material of the shaft. The advantage is reliable delivery of lubricant to a shaft; rotating at high speed in a high temperature environment.

Cette invention a trait à un système permettant de transférer un fluide de lubrification d'une source fixe vers l'intérieur d'un arbre menant d'un moteur à turbine tournant à une vitesse élevée et fonctionnant sous des températures élevées. Le fluide de lubrification est envoyé vers un passage radial délimité entre deux joints séparés sur un plan axial (24) entourant l'arbre (12). Les joints sont construits de manière qu'une pellicule de fluide de lubrification se forme entre eux et l'arbre et ce, afin que ces joints puissent servir à une vitesse et à des températures élevées. Les joints flottent sur la pellicule et leur usure s'en trouve réduite. Chaque joint est entouré, afin de réduire au maximum les variation spatiales entre les joints et l'arbre, d'une bague de commande (56) faite d'un matériau dont le coefficient de dilatation est le même que celui du matériau constituant l'arbre. Cette invention présente l'avantage de fournir un lubrifiant à un arbre tournant à une vitesse et à des température élevées

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