초록 ▼

A low-pressure turbine shaft (11) for a gas-turbine engine includes a fiber-composite plastic tube (13) with fiber layers provided in an inner wall area for taking up and transmitting torsional forces, and, in an outer wall area, with fiber layers suitably oriented for influencing stiffness and damp

A low-pressure turbine shaft (11) for a gas-turbine engine includes a fiber-composite plastic tube (13) with fiber layers provided in an inner wall area for taking up and transmitting torsional forces, and, in an outer wall area, with fiber layers suitably oriented for influencing stiffness and damping characteristics. The fiber layers are embedded in a high temperature resistant plastic matrix. A load input element (14) is an attachment flange (24) made of fiber-composite plastic material integrally formed on a fiber-composite plastic tube (13). A load output element (15) is a metallic driven protrusion inseparably connected to the fiber layers transmitting the torsional forces. Alternatively, the load input element may be provided as a metallic driving protrusion, which is firmly connected to the fiber layers taking up the torsional forces.

대표청구항 ▼

1. An engine shaft, comprising: a load input element on a driving side;a load output element on a driven side,a fiber-composite plastic tube, interconnecting the load input element and the load output element, the fiber-composite plastic tube comprising fiber layers in an inner wall area oriented to

1. An engine shaft, comprising: a load input element on a driving side;a load output element on a driven side,a fiber-composite plastic tube, interconnecting the load input element and the load output element, the fiber-composite plastic tube comprising fiber layers in an inner wall area oriented to take up and transmit torsional forces, and fiber layers in an adjoining outer wall area oriented to provide stiffness and natural frequency;wherein the engine shaft is a hollow body and the load input element is a gradually flaring tube section of the fiber-composite plastic tube and an attachment flange formed on the plastic tube made of at least one of a fiber-composite plastic material and a metallic driving protrusion inseparably connected to the fiber layers taking up the torsional forces, and the load output element is a metallic driven protrusion inseparably connected to the fiber layers;wherein the outer wall fiber layers are each disposed at an angle ranging between +5°/−5° and +12°/−12° inclusive essentially in a longitudinal direction of the shaft, while the inner wall fiber layers are each disposed at an angle ranging between +45°/−45° and +35°/−35° inclusive and are more transversely oriented to the longitudinal axis of the shaft;wherein the engine shaft is a gas turbine engine shaft. 2. The engine shaft of claim 1, wherein the outer wall fiber layers are oriented at an angle ranging between +5°/−5° and +7°/−7° inclusive. 3. The engine shaft of claim 1, wherein the fiber layers are wound as fiber braid in the case of an engine shaft provided as a radial shaft. 4. The engine shaft of claim 1, wherein the fiber layers are carbon fiber layers, with the fibers being embedded in a high temperature resistant plastic matrix. 5. The engine shaft of claim 1, wherein a number of fiber layers provided for transmitting the torsional forces and achieving the required stiffness is selected depending on respective requirements for load transmission and stiffness. 6. The engine shaft of claim 1, wherein, with reference to a longitudinal axis of the fiber-composite plastic tube, for the transmission of torsional forces, a first inner carbon fiber layer is oriented at an angle of +45°, a second carbon fiber layer at an angle of −45°, a third carbon fiber layer at an angle of +35° and a fourth carbon fiber layer at an angle of −35°, and, for increasing the stiffness, a fifth carbon fiber layer is oriented at an angle of +5° and a sixth carbon fiber layer at an angle of −5°. 7. The engine shaft of claim 6, wherein, in a case of the radial shaft driven at both shaft ends, for transmission of the different torques applied to the latter, the first and second fiber layers as well as the third and fourth fiber layers each form a fiber braid. 8. The engine shaft of claim 4, wherein the plastic matrix is made of at least one of cyanate resin, phenolic resin, polyimides and polyetherether-ketones. 9. The engine shaft of claim 1, and further comprising a hose-type braid of fibers oriented at an angle of +/−45°, which additionally envelops the fiber-composite plastic tube. 10. The engine shaft of claim 9, wherein the hose-type braid is a glass fiber layer. 11. The engine shaft of claim 1, wherein the engine shaft is resistant to temperatures to approx. 400° C.