The invention relates to an injection nozzle for injecting fuel under high pressure, comprising a nozzle body (2) in which a pressure chamber (9), which can be filled with fuel under high pressure, is formed and in which a conical body seat (25) is formed which opens into a blind hole (32), forming a transition edge (35), from which blind hole a plurality of injection holes (30) originate and the total of the flow cross-sections of all injection holes forms a total injection hole cross-section (A.sub.SL). A nozzle needle (14) is arranged in the pressure chamber (9) so as to be longitudinally movable, said nozzle needle interacting, by means of a conical sealing surface (27), with the body seat (25) in order to open and close a flow cross-section, wherein the nozzle needle (14) has, on the end thereof facing the body seat (25), a needle tip (28) which protrudes into the blind hole (32) when the sealing surface (27) contacts the body seat (25). A seat cross-section area (A.sub.S) is formed between the sealing surface (27) and the transition edge (35) when the nozzle needle (14) is raised from the body seat (25), through which seat cross-section area fuel can flow from the pressure chamber (9) into the blind hole (32). The needle tip (28) is conical and has an opening angle (13) that is smaller than the opening angle (a) of the conical sealing surface (27), and the blind hole (32) has a conical portion (132) having an opening angle (a) that is formed between the transition edge (35) and an intermediate edge (36), wherein the needle tip (28) is arranged in a partial stroke of the nozzle needle (14) at the height of the conical portion (132) of the blind hole (32).

The invention relates to an injection nozzle for injecting fuel under high pressure, comprising a nozzle body (2) in which a pressure chamber (9), which can be filled with fuel under high pressure, is formed and in which a conical body seat (25) is formed which opens into a blind hole (32), forming a transition edge (35), from which blind hole a plurality of injection holes (30) originate and the total of the flow cross-sections of all injection holes forms a total injection hole cross-section (A.sub.SL). A nozzle needle (14) is arranged in the pressure chamber (9) so as to be longitudinally movable, said nozzle needle interacting, by means of a conical sealing surface (27), with the body seat (25) in order to open and close a flow cross-section, wherein the nozzle needle (14) has, on the end thereof facing the body seat (25), a needle tip (28) which protrudes into the blind hole (32) when the sealing surface (27) contacts the body seat (25). A seat cross-section area (A.sub.S) is formed between the sealing surface (27) and the transition edge (35) when the nozzle needle (14) is raised from the body seat (25), through which seat cross-section area fuel can flow from the pressure chamber (9) into the blind hole (32). The needle tip (28) is conical and has an opening angle (13) that is smaller than the opening angle (a) of the conical sealing surface (27), and the blind hole (32) has a conical portion (132) having an opening angle (a) that is formed between the transition edge (35) and an intermediate edge (36), wherein the needle tip (28) is arranged in a partial stroke of the nozzle needle (14) at the height of the conical portion (132) of the blind hole (32).

The invention relates to a fuel injector (10) for internal combustion engines, comprising a nozzle body (12), in which there is formed a blind bore (14), from which at least one injection opening (22) starts, and comprising a nozzle needle (26; 26a to 26g) which is arranged so as to be movable longitudinally in the nozzle body (12), with a sealing face (28) formed on the side facing towards the blind bore (14), by means of which sealing face the nozzle needle (26; 26a to 26g) interacts with a seat face (17) of the nozzle body (12) in order to control a flow of fuel to the at least one injection opening (22), and comprising a needle tip (34), which has a first edge (41) miming radially around a longitudinal axis (15) and having a first diameter (D.sub.1), which first edge is adjoined in the direction of the base of the blind bore (20) by a second edge (42) miming radially around the longitudinal axis (15) and having a second diameter (D.sub.2).

The invention relates to a fuel injector (10) for internal combustion engines, comprising a nozzle body (12), in which there is formed a blind bore (14), from which at least one injection opening (22) starts, and comprising a nozzle needle (26; 26a to 26g) which is arranged so as to be movable longitudinally in the nozzle body (12), with a sealing face (28) formed on the side facing towards the blind bore (14), by means of which sealing face the nozzle needle (26; 26a to 26g) interacts with a seat face (17) of the nozzle body (12) in order to control a flow of fuel to the at least one injection opening (22), and comprising a needle tip (34), which has a first edge (41) miming radially around a longitudinal axis (15) and having a first diameter (D.sub.1), which first edge is adjoined in the direction of the base of the blind bore (20) by a second edge (42) miming radially around the longitudinal axis (15) and having a second diameter (D.sub.2).

The invention relates to a fuel injector for internal combustion engines for injecting fuel at high pressure, comprising a pressure chamber formed in an injector body, in which pressure chamber a nozzle needle is arranged in a longitudinally movable manner, which nozzle needle has a cone region tapered in a combustion chamber direction and a pin region having a constant diameter d23 at a combustion-chamber end of the nozzle needle. The injector body has a substantially conical nozzle needle seat, from which a first injection opening extends, and a blind hole, which adjoins the nozzle needle seat on the combustion chamber side. The blind hole has a cylindrical segment, which has the diameter d31, and a hole base, from which a second injection opening extends. The cone region of the nozzle needle interacts with the nozzle needle seat and thereby opens and closes the first injection opening and the second injection opening with respect to the pressure chamber. During a partial stroke of the nozzle needle, the first injection opening and the second injection opening are connected to each other by means of a throttle gap, which is formed in the blind hole between the pin region and the wall of the blind hole, and the throttle gap remains constant at least over the partial stroke of the nozzle needle.

The invention relates to a fuel injector for internal combustion engines for injecting fuel at high pressure, comprising a pressure chamber formed in an injector body, in which pressure chamber a nozzle needle is arranged in a longitudinally movable manner, which nozzle needle has a cone region tapered in a combustion chamber direction and a pin region having a constant diameter d23 at a combustion-chamber end of the nozzle needle. The injector body has a substantially conical nozzle needle seat, from which a first injection opening extends, and a blind hole, which adjoins the nozzle needle seat on the combustion chamber side. The blind hole has a cylindrical segment, which has the diameter d31, and a hole base, from which a second injection opening extends. The cone region of the nozzle needle interacts with the nozzle needle seat and thereby opens and closes the first injection opening and the second injection opening with respect to the pressure chamber. During a partial stroke of the nozzle needle, the first injection opening and the second injection opening are connected to each other by means of a throttle gap, which is formed in the blind hole between the pin region and the wall of the blind hole, and the throttle gap remains constant at least over the partial stroke of the nozzle needle.

A fuel injector for internal combustion engines is provided, which has a valve seat member, bordering a valve chamber, having a valve seat and spray orifices and a central blind-end bore as well as a valve member that is able to be driven to cause a lift motion having a closing head, which, together with a valve seat, forms a sealing seat lying upstream of the spray orifices. In order to prevent an underpressure developing in the blind-end bore in the closing phase of the sealing seat, and a partial return flow of the fuel connected with it, the closing head of the valve member is provided, at its end face facing towards the valve seat member, with a plunger sticking out from closing head, which has a shape adjusted to the contour of the blind-end bore, and dips into the blind-end bore when the sealing seat is closed.

A fuel injector for internal combustion engines is provided, which has a valve seat member, bordering a valve chamber, having a valve seat and spray orifices and a central blind-end bore as well as a valve member that is able to be driven to cause a lift motion having a closing head, which, together with a valve seat, forms a sealing seat lying upstream of the spray orifices. In order to prevent an underpressure developing in the blind-end bore in the closing phase of the sealing seat, and a partial return flow of the fuel connected with it, the closing head of the valve member is provided, at its end face facing towards the valve seat member, with a plunger sticking out from closing head, which has a shape adjusted to the contour of the blind-end bore, and dips into the blind-end bore when the sealing seat is closed.

A valve system of a vehicle includes: a housing that is electrically conductive and made of a metal and that includes: an inlet configured to receive a fluid; an outlet configured to output the fluid; and a fluid channel fluidly connecting the inlet and the outlet; a pintle disposed within the housing and that is electrically conductive and made of a metal; a ball that is mechanically fastened to the pintle, that is configured to close the outlet, and that is electrically conductive and made of a metal; an armature that is mechanically fastened to the pintle, that is disposed within the housing, and that is electrically conductive and made of a metal; a solenoid coil that is disposed within the housing and that surrounds the pintle; and an electrically insulative material configured to insulate the pintle from the housing.

A valve system of a vehicle includes: a housing that is electrically conductive and made of a metal and that includes: an inlet configured to receive a fluid; an outlet configured to output the fluid; and a fluid channel fluidly connecting the inlet and the outlet; a pintle disposed within the housing and that is electrically conductive and made of a metal; a ball that is mechanically fastened to the pintle, that is configured to close the outlet, and that is electrically conductive and made of a metal; an armature that is mechanically fastened to the pintle, that is disposed within the housing, and that is electrically conductive and made of a metal; a solenoid coil that is disposed within the housing and that surrounds the pintle; and an electrically insulative material configured to insulate the pintle from the housing.