US 9,810,352 B2
Threaded connection of high-pressure fluid-carrying components of an injection device for internal combustion engines
Gernot Nussbaumer, Pennewang (AT)
Assigned to ROBERT BOSCH GMBH, Stuttgart-Feuerbach (DE)
Filed by Robert Bosch GmbH, Stuttgart-Feuerbach (DE)
Filed on Feb. 7, 2013, as Appl. No. 13/761,279.
Claims priority of application No. A 161/2012 (AT), filed on Feb. 7, 2012.
Prior Publication US 2013/0200616 A1, Aug. 8, 2013
Int. Cl. B21D 51/16 (2006.01); F16L 15/00 (2006.01); F02M 47/02 (2006.01); F02M 55/00 (2006.01); F02M 61/16 (2006.01); F16L 19/02 (2006.01)
CPC F16L 15/00 (2013.01) [F02M 47/027 (2013.01); F02M 55/005 (2013.01); F02M 61/168 (2013.01); F16L 15/001 (2013.01); F16L 19/0206 (2013.01); F02M 2200/03 (2013.01); F02M 2200/40 (2013.01); F02M 2200/8076 (2013.01); Y10T 29/49432 (2015.01); Y10T 29/49881 (2015.01)] 7 Claims
OG exemplary drawing
 
1. A method for producing a threaded connection between a first component that is an integrated high-pressure accumulator of a modular common-rail injector for an internal combustion engine and a second component that is a supporting body of the modular common-rail injector for an internal combustion engine, which components are configured for carrying high-pressure fluid, said method comprising
providing said first component, wherein said first component has a tubular end portion having an interior surface, a resting surface on the interior surface and internal threads formed on another part of the interior surface, the internal threads configured to engage external threads of said second component,
providing said second component, wherein said second component has an external thread configured for threadably engaging the internal threads of the first component and having a separate end face configured for being clamped against the resting surface of the first component after the components are screwed together,
pressing an outer ring onto the tubular end portion of the integrated high-pressure accumulator of a modular common-rail injector to impart an elastic prestress acting in a radial direction onto the tubular end portion,
wherein the elastic prestress imparted by the outer ring imparts a compression between the outer ring and the tubular end portion that is at least 150 N/mm2, and
screwing the first and second components together,
wherein the compression imparted between the outer ring and the tubular end portion provides relief to a portion of the threads of the first and second components when the first and second components are threadably screwed together, and the resting surface and the end face are pressed against each other by the compression when the integrated high-pressure accumulator of a modular common-rail injector and the supporting body of the modular common-rail injector are screwed together.