Method of making valve sleeves
AssigneeTRW Cam Gears Limited
InventorPeter R. Rogers
Life of this patent
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Abstract
This invention relates to methods of making valve sleeves. The valve sleeve 35 is manufactured from a tube 10 which is initially placed on a mandrel 20, which is formed with axially-extending projections 23 spaced about it circumferentially. The tube is then swaged on to the mandrel to form grooves 28, which have the shape and the dimensions of 23. The mandrel 20 is then replaced by a cylindrical mandrel 30 and the open ends of grooves 28 are then closed by a further swaging operation. This method enables valve sleeves, having stopped axially-extending grooves in their inner surface with accurately located lips, to be formed from a single piece of metal.
Claims5
A method of forming a one piece valve sleeve for a rotary valve, comprising forming a tube having a generally annular portion defining a restricted aperture at one end, swaging the tube on a mandrel to form axially extending grooves having accurately formed lips in the inner surface of a tube so that one end of each groove is stopped by the annular portion and deforming the tube to stop the other ends of the grooves, the portion of the tube which is deformed to close the other ends of the grooves being initially thicker than the central section of the tube.
Dependencies are inferred from the claim text.