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US 2017/0321586 A1Published application
Injection device
AssigneeRobert Bosch GmbH
InventorsThorsten Stoeberl, Dirk Welting, Rainer Haeberer
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AssigneeRobert Bosch GmbH
InventorsThorsten Stoeberl, Dirk Welting, Rainer Haeberer
Estimating the term…
The invention relates to an injection device (1), in particular for an exhaust aftertreatment system of an internal combustion engine, comprising a pressure-controlled, outward-opening fuel injection valve (2) that includes an axially movable valve piston (6) which penetrates a flow opening (7) in a valve body (5) and one end of which has a valve tip (9), further comprising a valve seat (8) associated with the flow opening (7), and at least one spring element (11) which urges the valve piston (6) comprising the valve tip (9) against the valve seat (8) so that the flow opening (7) is closed; the valve tip (9) is axially movable inside a flow chamber (15) formed by the valve body (5) and by an injection orifice disk (14) that includes a plurality of injection ports (19).
1-9. (canceled)
An injection device (1), comprising a pressure-controlled and outward-opening injection valve (2) which includes an axially displaceable valve piston (6) which penetrates through a throughflow opening (7) in a valve body (5) and has a valve tip (9) at one end, a valve seat (8) assigned to the throughflow opening (7), and at least one spring element (11) which urges the valve piston (6) having the valve tip (9) against the valve seat (8) in order to close the throughflow opening (7), wherein the valve tip (9) is axially displaceable in a flow chamber (15) which is formed, on one hand, by the valve body (5) and, on an other hand, by a perforated injection plate (14) which has a plurality of injection openings (19), wherein the valve tip (9) has, on a side opposed to the valve seat (8), an axial stop (18) interacting with the perforated injection plate (14), characterized in that the axial stop (18) is formed by an axial projection (17) on a flat underside (16) of the valve tip (9) that is assigned to the perforated injection plate (14).
Dependencies are inferred from the claim text.