| 摘要 |
The invention relates to an injector (15) comprising an actuator space (45) in which an actuator (50) is arranged, a piston guide (60, 106, 115) in which a bore hole (65, 105, 115) is provided, and a piston (70, 100, 110) that is arranged in the bore hole (65, 105, 115) of the piston guide (60, 106, 115), said piston (70, 100, 110) having a first end face (75) that faces the actuator (50) and delimiting, with said first end face (75), a first space (45, 80, 125) that is arranged in and/or on the bore hole (65, 105), and said piston (70, 100, 110) delimiting, with a second end face (86) that lies opposite the first space (45, 80, 125), an adjoining second space (80, 85, 40) in and/or on the bore hole (65, 105). The piston (70, 100, 110) is arranged between the first space (45, 80, 125) and the second space (80, 85, 40) and a gap (150, 155, 185) with a gap width b is provided around the circumference of said piston (70, 100, 110) between the piston (70, 100, 110) and the bore hole (65, 105, 115), said piston (70, 100, 110) comprising a first material and the piston guide (60, 106, 115) comprising a second material, the first material having a first thermal expansion when heated and the second material having a second thermal expansion when heated which differs from the first thermal expansion, and the first material being selected in relation to the second material such that when the piston guide (60, 106, 115) and/or piston (70, 100, 110) is/are heated, the gap width b of the gap (150, 155, 185) decreases so as to limit fuel leakage (160, 170, 190) between the first space (45, 80, 125) and the second space (80, 85, 40). |
