Patent ID: 9506434
Filing Date: 2016-11-29
CPC Classification: F02M

Claim Text:
1. A fuel injector comprising: an injector body defining a first nozzle outlet set, a second nozzle outlet set and a drain outlet, and having disposed therein a first nozzle chamber, a second nozzle chamber, a first control chamber and a second control chamber; a first check valve member defining a through passage and being positioned entirely inside the injector body with a closing hydraulic surface exposed to fluid pressure in the first control chamber, and being movable between a closed position in contact with a first seat on the injector body covering the first nozzle outlet set to fluidly block the first nozzle chamber to the first nozzle outlet set, and an open position out of contact with the first seat to fluidly connect the first nozzle chamber to the first nozzle outlet set; a second check valve member positioned entirely inside the injector body with a closing hydraulic surface exposed to fluid pressure in the second control chamber, and being movable between a closed position in contact with a second seat on the first check valve member to fluidly block the second nozzle chamber to the through passage and the second nozzle outlet set, and an open position out of contact with the second seat to fluidly connect the second nozzle chamber to the through passage and the second nozzle outlet set; one control valve member positioned in the injector body and movable between a first position at which the first control chamber and the second control chamber are both fluidly blocked to the drain outlet, and a second position at which the first control chamber and the second control chamber are both fluidly connected to the drain outlet; and wherein the fuel injector further consists of exactly one spring operably positioned to bias the first and second check valve members toward the respective closed positions.