| 摘要 |
An injector includes an actuator arranged in an actuator space, a piston guide having a bore hole, and a piston arranged in the bore hole. The piston has a first end face facing the actuator and delimiting a first space in and/or on the bore hole, and a second end face lying opposite the first space and delimiting an adjoining second space in and/or on the bore hole. The piston is arranged between the first and second spaces, and a gap extends around the circumference of the piston between the piston and the bore hole. The piston includes a first material and the piston guide includes a second material, the first and second materials having different thermal expansion properties such that when the piston guide and/or piston are heated, the gap width of the gap decreases to limit fuel leakage between the first space and second spaces. |
| 主权项 |
1. An injector, comprising:
an actuator chamber, an actuator arranged in the actuator chamber, a piston guide having a bore, a piston arranged in the bore of the piston guide, wherein the piston has a first face side facing toward the actuator, wherein the first face side delimits a first chamber arranged in or at the bore, wherein the piston has a second face side located opposite the first chamber, wherein the second face side delimits a second chamber in or at the bore, wherein the piston is arranged between the first chamber and the second chamber, wherein a gap extends around a circumference between the piston and the bore, the gap having a gap width, wherein the piston includes a first material and the piston guide includes a second material, wherein the first material, when heated, exhibits first thermal expansion, and the second material, when heated, exhibits second thermal expansion that differs from the first thermal expansion, and wherein the first material is selected relative to the second material such that, when at least one of the piston guide or the piston is heated, the gap width of the gap decreases to thereby limit fuel leakage between the first chamber and the second chamber. |
