Composite gear part for a gear arrangement and a method of forming a composite gear part
AssigneeVestas Wind Systems A/S
InventorJens Demtröder
Life of this patent
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Abstract
A composite gear part for a gear arrangement includes a shaft part adapted to be rotationally mounted in the gear arrangement, an inner part made from a first material, and an outer part made from a second material. The outer part is fixed circumferentially to the inner part, and the outer part has a plurality of gear teeth formed therein. The outer part must be made from a material which is sufficiently durable and hard to fulfill requirements for gear teeth, but the material of the inner part need not fulfill such requirements. The inner part includes recesses or apertures arranged so that the inner part supports the outer part in an asymmetric manner.
Claims19
A composite gear part for a gear arrangement, the composite gear part comprising:
- a shaft part adapted to be rotationally mounted in the gear arrangement about an axis of rotation,
- an inner part made from a first material, and
- an outer part made from a second material, said outer part being formed as a separate member from the inner part and then fixed circumferentially to the inner part, and said outer part having a plurality of gear teeth formed therein,
- wherein the inner part is formed integrally with the shaft part, and wherein the inner part comprises one or more recesses that are each circumferentially symmetrical in all radial directions around the axis of rotation and that are arranged asymmetrically in an axial orientation along the axis of rotation in such a manner that the inner part supports the outer part in an asymmetric manner, the inner part defining a cross section extending between the shaft part and the outer part that is identical in all radial directions around the axis of rotation.
A composite gear part for a gear arrangement, the composite gear part comprising:
- a shaft part adapted to be rotationally mounted in the gear arrangement, wherein the shaft part is hollow,
- an inner part made from a first material, and
- an outer part made from a second material, said outer part being formed as a separate member from the inner part and then fixed circumferentially to the inner part, and said outer part having a plurality of gear teeth formed therein,
- wherein the inner part is formed integrally with the shaft part, and wherein the inner part comprises one or more recesses that are arranged asymmetrically in such a manner that the inner part supports the outer part in an asymmetric manner,
- wherein the inner part defines an interior cavity arranged inside the inner part, the interior cavity communicating with and projecting outwardly from a hollow portion of the shaft part such that the interior cavity interrupts the shaft part at a location where the interior cavity communicates with and projects outwardly from the hollow portion, wherein the hollow portion extends along an entire length of the shaft part and the interior cavity projects outwardly from the hollow portion along only a portion of the entire length of the shaft part.
A method of forming a composite gear part, the method comprising:
- providing an inner part made from a first material and a shaft part adapted to be rotationally mounted in a gear arrangement about an axis of rotation, the inner part being formed integrally with the shaft part, and the inner part being provided with one or more recesses that are each circumferentially symmetrical in all radial directions around the axis of rotation,
- providing an outer part made from a second material, the outer part formed as a separate member from the inner part, and the outer part having a plurality of gear teeth formed therein,
- arranging the outer part circumferentially to the inner part, in such a manner that the one or more recesses of the inner part are arranged asymmetrically in an axial orientation along the axis of rotation so that the inner part supports the outer part in an asymmetric manner, with the inner part defining a cross section extending between the shaft part and the outer part that is identical in all radial directions around the axis of rotation, and
- attaching the outer part onto the inner part.
Dependencies are inferred from the claim text.