Injector for blowing a gas into a combustion chamber or into an intake manifold of a motor vehicle

An injector for blowing a gas into a combustion chamber (190) or into an intake manifold of a combustion engine, preferably an internal combustion engine for motor vehicles, comprising:

• an injector housing (1) having
• an inlet (63, 123) for the gas, and
• an outlet opening (4);
• and
• an injector needle (2) by which the outlet opening (4) can be closed, and which can be adjusted in pressure-controlled fashion from a closed position to an open position,
• wherein the injector needle (2) is axially fixedly connected to at least one piston (26),
• wherein the at least one piston (26) is under closing pressure in one direction, and under a valve-controlled control pressure in another direction,
• wherein the piston (26) can be actuated by the control pressure in order to adjust the injector needle (2) into the open position,
• wherein the piston (26) is provided in a pressure chamber (59),
• wherein the inlet (63, 123) or an access for a control medium is connected to or to be connected to a medium chamber (38;
• 54),
• wherein the medium chamber (38;
• 54) is separated from the pressure chamber (59) by a first valve (41, 61;
• 82, 83),
• wherein the first valve (41, 61;
• 82, 83) is actuable by an actuator,
• wherein the actuator includes a valve actuating piston (41),
• wherein the valve actuating piston (41) in a first position closes the access from the medium chamber (38;
• 54) to the pressure chamber (59), and
• wherein the valve actuating piston (41) cooperates with a second valve (35;
• 82;
• 81), and
• wherein the second valve (35;
• 82;
• 81),
• in a first position of the valve actuating piston (41), is held in an open position and
• is closed in a second position of the valve actuating piston (41), such that the control pressure prevails in the pressure chamber (59), whereby the first valve (41, 61;
• 82, 83) is opened.

An injector for blowing a gas into a combustion chamber (190) or into an intake manifold of a combustion engine, preferably an internal combustion engine for motor vehicles, comprising:

• an injector housing (1) having
• an inlet (63, 123) for the gas, and
• an outlet opening (4);
• and
• an injector needle (2) by which the outlet opening (4) can be closed and which can be adjusted in pressure-controlled fashion from a closed position to an open position,
• wherein the injector needle (2) is axially fixedly connected to at least one piston (26),
• wherein the at least one piston (26) is under closing pressure in one direction and can be displaced in another direction for adjusting the injector needle (2) into the open position,
• wherein the injector needle (2) has an axial bore (91),
• wherein the axial bore (91) is aligned with an axial bore (87) of an actuating piston (41),
• wherein a magnetic armature (43) is axially fixedly arranged on the actuating piston (41),
• wherein the axial bore (87) of the actuating piston (41) is connected to the inlet (123) for the gas,
• wherein the injector needle (2) is axially fixedly connected to a compensation piston (101),
• wherein the compensation piston (101) is provided at a side of the piston (26) facing the outlet opening (4),
• wherein the piston (26) has a sleeve-shaped guide part (31),
• wherein a check valve (133) is arranged in the sleeve-shaped guide part (31),
• wherein the check valve (133) closes the axial bore (87) of the actuating piston (41), and
• wherein the actuating piston (41) is axially displaced by attracting the magnetic armature (43) such that the check valve (133) is opened and the injector needle (2) is displaced via the piston (26) and the compensation piston (101).