Gear pump
First Claim
Patent Images
1. A gear pump comprising:
- a housing for housing gear pump rotors,at least one of said gear pump rotors comprising a shaft being led to the outside of said housing through a bore in said housing,said bore comprising a shaft bearing section and a shaft sealing section arranged axially outwards of said bearing section with respect to a gear wheel of said at least one gear pump rotor,said sealing section being arranged in an end cover plate of said housing and comprising a labyrinth seal with a labyrinth machined into material of said end cover plate.
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Accused Products
Abstract
A gear pump comprising a housing for housing gear pump rotors in a housing interior, said housing having a housing end at an end face side of the housing through which at least one pump rotor shaft is guided from the housing interior to outside the housing, a shaft bearing in the housing end for rotatably supporting the rotor shaft, and a labyrinth seal in the housing end which in use surrounds the rotor shaft, wherein the shaft bearing is arranged separately from the labyrinth seal at a position spaced axially inward toward the housing interior with respect to the labyrinth seal.
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Citations
15 Claims
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1. A gear pump comprising:
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a housing for housing gear pump rotors, at least one of said gear pump rotors comprising a shaft being led to the outside of said housing through a bore in said housing, said bore comprising a shaft bearing section and a shaft sealing section arranged axially outwards of said bearing section with respect to a gear wheel of said at least one gear pump rotor, said sealing section being arranged in an end cover plate of said housing and comprising a labyrinth seal with a labyrinth machined into material of said end cover plate. - View Dependent Claims (2, 3)
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4. A gear pump comprising:
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a housing for housing gear pump rotors, at least one of said gear pump rotors comprising a shaft being led to the outside of said housing through a bore in said housing, said bore comprising a shaft bearing section and a shaft sealing section arranged axially outwards of said bearing section with respect to a gear wheel of said at least one gear pump rotor, said sealing section and said bearing section being both provided in a unitary end cover plate of said housing, and a duct system for a cooling medium in said cover plate of said housing.
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5. A gear pump, comprising:
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a housing for housing gear pump rotors, at least one of said gear pump rotors comprising a shaft being led to the outside of said housing through a bore in said housing, said bore comprising a shaft bearing section and a shaft sealing section arranged axially outwards of said bearing section with respect to a gear wheel of said at least one gear pump rotor, said sealing section and said bearing section being both provided in a unitary end cover plate of said housing, wherein said sealing section comprises a labyrinth seal, wherein said labyrinth seal is machined into the material of a bushing residing within said bore of said cover plate of said housing, and wherein said bearing section comprises a bearing shell within said bore of said cover plate of said housing, the outer diameter of said bearing shell being smaller than the outer diameter of said bushing. - View Dependent Claims (6, 7, 8)
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9. A method of making a gear pump of the type including a housing for housing gear pump rotors, at least one of said gear pump rotors comprising a shaft being led to the outside of said housing through a bore in a unitary cover plate of said housing, said bore comprising a shaft bearing section and a shaft sealing section arranged axially outwards of said bearing section with respect to a gear wheel of said at least one gear pump rotor,
said method comprising providing both said sealing section and said bearing section in the unitary cover plate of said housing, and providing a duct system for a cooling medium in said cover plate of said housing.
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11. A method of making a gear pump of the type including a housing for housing gear pump rotors, at least one of said gear pump rotors comprising a shaft being led to the outside of said housing through a bore in a unitary cover plate of said housing, said bore comprising a shaft bearing section and a shaft sealing section arranged axially outwards of said bearing section with respect to a gear wheel of said at least one gear pump rotor,
said method comprising providing both said sealing section and said bearing section in the unitary cover plate of said housing, and wherein said sealing section comprises a labyrinth seal, said method comprising machining said labyrinth seal into material of a bushing and inserting the bushing within said bore of said cover plate of said housing, and providing said bearing section in a bearing shell within said bore of said cover plate of said housing, the outer diameter of said bearing shell being smaller than the outer diameter of said bushing.
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15. A method of making a gear pump of the type including a housing for housing gear pump rotors, at least one of said gear pump rotors comprising a shaft being led to the outside of said housing through a bore in a unitary cover plate of said housing, said bore comprising a shaft sealing section, said method comprising machining a labyrinth seal for said shaft into the material of said unitary cover plate.
Specification