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US 8,784,030 B2Granted
Screw having an underhead bearing surface including lubricant pockets
AssigneeKAMAX Holding GmbH & Co. KG
InventorsMarkus Grobecker, Norbert Bietz, Gunther Hartmann
Life of this patent
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Abstract
A screw (2) has a head (5) including an underhead bearing surface (12). Lubricant pockets (13) are arranged at least in a part of the underhead bearing surface (12). The lubricant pockets (13) serve to contain lubricant and to release the lubricant when tightening a screw joint (1) to prevent galling effects during multiple tightening processes.
Claims30
A screw, comprising:
- a head, the head having an underhead bearing surface, the underhead bearing surface having a radial direction, a circumferential direction and a radial width;
- and
- a plurality of lubricant pockets containing lubricant,
- the lubricant pockets being designed as cold formed lubricant pockets,
- the lubricant pockets being arranged at least in a part of the underhead bearing surface,
- the lubricant pockets being arranged in an irregular way,
- the lubricant pockets being designed not to be continuous in the radial direction and in the circumferential direction of the underhead bearing surface, and
- the lubricant pockets having an average diameter of between approximately 50 to 500 μm and corresponding to approximately maximally 20% of the radial width of the underhead bearing surface.
5 more elements
A screw joint, comprising:
- a component including a surface and a bore;
- a screw having a head including an underhead bearing surface, the screw extending through the bore of the component;
- a washer having a first surface and an opposite second surface, the washer being arranged between the underhead bearing surface of the screw and the surface of the component, the first surface of the washer beinq arranged to face the underhead bearing surface of the screw and the second surface of the washer being arranged to face the surface of the component;
- and
- a plurality of lubricant pockets, the lubricant pockets being designed as cold formed lubricant pockets and being arranged in at least a part of the underhead bearing surface of the screw.
2 more elements
A screw, comprising:
- a head, the head having an underhead bearing surface;
- and
- a plurality of lubricant pockets, the lubricant pockets being designed as cold formed lubricant pockets and being arranged at least in a part of the underhead bearing surface.
A washer for combination with a screw, the screw having a head including an underhead bearing surface, the washer comprising:
- a first surface facing the underhead bearing surface of the screw;
- and
- a plurality of lubricant pockets, the lubricant pockets being designed as cold formed lubricant pockets and being arranged at least in a part of the first surface.
A screw, comprising:
- a head, the head having an underhead bearing surface;
- and
- a plurality of lubricant pockets, the lubricant pockets being only arranged in a part of the underhead bearing surface.
Dependencies are inferred from the claim text.