Fuel injector for in-cylinder injection

An injector for directly injecting fuel into a cylinder of an internal combustion engine having a socket, the injector comprising:

• a nozzle insertable into the socket, the nozzle including a distal end, wherein an annular gap is defined between the nozzle and the socket when the nozzle is received in the socket;
• a first seal groove, formed in the nozzle, for receiving a first gas seal that seals the annular gap, the first seal groove having a first cross-sectional shape;
• and
• a second seal groove, formed in the nozzle, for receiving a second gas seal that seals the annular gap, the second seal groove being formed closer to the distal end of the nozzle than the first seal groove and having a second cross-section, wherein the first and second cross sections are determined so that deformation amount of the first gas seal is greater than deformation amount of the second gas seal when the nozzle is received in the socket;
• wherein the first seal groove has at least one sloped wall.

An injector for directly injecting fuel into a cylinder of an internal combustion engine having a socket, the injector comprising:

• a nozzle insertable into the socket, the nozzle including a distal end, wherein an annular gap is defined between the nozzle and the socket when the nozzle is received in the socket;
• first and second gas seals;
• and
• means for mounting the first and second gas seals around the nozzle with one seal closer to the nozzle distal end than the other, and for providing that said other seal has a deformation amount greater than that of said one seal when the nozzle is received in the socket;
• wherein each of the grooves includes a pair of walls and a bottom, with at least one wall of one of the grooves being sloped, and the walls of the other groove being orthogonal to the bottom of that groove.