US 9,810,179 B2
Gas injector for the direct injection of gaseous fuel into a combustion chamber
Felix Jaegle, Ditzingen (DE); Olaf Ohlhafer, Erligheim (DE); Joerg Schoefer, Gerlingen (DE); and Robert Giezendanner-Thoben, Gerlingen (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Jan. 16, 2015, as Appl. No. 14/599,071.
Claims priority of application No. 10 2014 200 756 (DE), filed on Jan. 17, 2014.
Prior Publication US 2015/0204275 A1, Jul. 23, 2015
Int. Cl. F02M 21/02 (2006.01); F02M 45/08 (2006.01); F02M 45/12 (2006.01)
CPC F02M 21/0263 (2013.01) [F02M 21/0269 (2013.01); F02M 21/0275 (2013.01); F02M 45/08 (2013.01); F02M 45/12 (2013.01); Y02T 10/32 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A gas injector for directly injecting gaseous fuel into a combustion chamber of an internal combustion engine, comprising:
a valve seat;
a valve needle, which releases a first cross-sectional area at the valve seat in a lift; and
a gas control region situated at the valve needle and which defines a second cross-sectional area together with a component surrounding the valve needle;
wherein in response to a lift, a change in the first cross-sectional area at the valve seat differs from a change in the second cross-sectional area at the gas control region, and
wherein downstream from the gas control region in a flow direction, the gas injector has a space having a larger radius than a radius of the valve seat, so that once a predefined lift has occurred at the gas control region, the gas control region has no effect on an overall cross-sectional area for the injection of the gaseous fuel.