摘要:
A leak-free injector is proposed, the closing force of which is increased by a closing piston. An injector has a nozzle needle and a control valve, the nozzle needle being guided in an injector housing and cooperating with a nozzle needle seat of the injector housing. A high-pressure chamber is present between the control valve and the nozzle needle seat, and the closing piston is provided on the nozzle needle. The closing piston subdivides the high-pressure chamber into a first region and a second region. The two regions of the high-pressure chamber communicate hydraulically via a closing throttle restriction.
摘要:
The invention relates to a fuel injector and, in particular, to a common-rail injector for injecting fuel into a combustion chamber of an internal combustion engine with a multi-part injection valve element, which can be adjusted between an open position and a closed position. A first part and a second part of the injection valve element are coupled to one another via a hydraulic coupler, which is bounded radially by a first guide for the first part and by a second guide for the second part. According to the invention, at least some sections of the first and the second guide are surrounded at their outer radii by fuel under high pressure, and the pressure realized in the hydraulic coupler is lower than the pressure radially outside the guides.
摘要:
The invention relates to a fuel injector, in particular a common rail injector, for injecting fuel into a combustion chamber of an internal combustion engine. The fuel injector has a multi-part injection valve element, which is adjustable between a closing position and an opening position and includes a first part and at least one second part that is adjustable relative to the first part. The first and second parts are coupled to one another via a hydraulic coupler volume. According to the invention, it is provided that the first part is guided in the second part, or the second part is guided in the first part, and that the coupler volume communicates with an injector volume via at least one throttle arrangement. The throttle arrangement is embodied such that the volumetric through flow increases only disproportionately little with an increasing pressure difference between the coupler volume and the injector volume.
摘要:
The invention relates to a method for producing a fuel injection valve (10; 10a; 60; 60a), in which a valve needle (40; 40a; 62; 62a) which closes at least one fuel outlet opening (49) is inserted into an injector housing (11), wherein that end of the valve needle (40; 40a; 62; 62a) which lies opposite the at least one fuel outlet opening (49) is guided in a valve element (32) which has a pressurized control chamber (37) which is filled with fuel, wherein the control chamber (37) can be closed on the side which faces away from the valve needle (40; 40a; 62; 62a) by a closing element (23) which forms a passage during opening and is connected at least indirectly to a fuel return line (5) which is under low pressure, wherein fuel volume which is present in the control chamber (37) flows away through the passage after opening of the control chamber (37) by means of the closing element (23), wherein the valve needle (40; 40a; 62; 62a) moves in the direction of the closing element (23), wherein the at least one fuel outlet opening (49) is opened, and wherein a delay time (t) occurs between the opening of the control chamber (37) and the opening of the at least one fuel outlet opening (49) on account of the magnitude of the volume of the control chamber (37) and on account of the rigidity of the valve needle (40; 40a; 62; 62a), which rigidity is caused by the modulus of elasticity, the diameter (D) and the length (L) of the valve needle (40; 40a; 62; 62a). There is provision according to the invention for at least the volume of the control chamber (37) to be adapted in order to achieve identical delay times (t) in fuel injection valves (10; 10a; 60; 60a) having injector housings (11) of different length and valve needles (40; 40a; 62; 62a) of different length, in such a way that the volume of the control chamber (37) is reduced in order to shorten the delay time (t) and the volume of the control chamber (37) is increased in order to lengthen the delay time (t).
摘要:
The invention relates to a fuel injector and, in particular, to a common-rail injector for injecting fuel into a combustion chamber of an internal combustion engine with a multi-part injection valve element, which can be adjusted between an open position and a closed position. A first part and a second part of the injection valve element are coupled to one another via a hydraulic coupler, which is bounded radially by a first guide for the first part and by a second guide for the second part. According to the invention, at least some sections of the first and the second guide are surrounded at their outer radii by fuel under high pressure, and the pressure realized in the hydraulic coupler is lower than the pressure radially outside the guides.
摘要:
The invention relates to a fuel injection valve for internal combustion engines, having a valve body, in which a pressure chamber is configured. A valve needle is disposed in the pressure chamber in a longitudinally displaceable manner. The valve body has a valve seat which interacts with a sealing surface configured on the valve needle. The valve seat delimits the pressure chamber, thus enabling or interrupting a fuel flow to at least one injection opening by the interaction of the valve needle with the valve seat. To this end, the fuel flow to the injection openings occurs between the valve needle and the wall of the pressure chamber, through a sharp-edged gap throttle which is formed between the valve needle and the wall of the pressure chamber.
摘要:
The invention relates to a device and method for metering a liquid, in particular a fuel, into an exhaust gas tract of an internal combustion engine, wherein the device comprises at least one injection valve that can be closed by a closing member and that has cooling circuit for regulating the temperature in the injection valve, and wherein a throttle element is connected upstream of the injection valve to control, by closed loop or open loop, the quantity of a volume flow of the liquid through the injection valve, in particular through the cooling circuit of the injection valve, wherein the injection valve opens when the throttle element de-throttles the volume flow of the liquid to the injection valve.
摘要:
The invention proposes a method for metering a reagent, in which the reagent is sprayed into a spray tube (12) via an electrically activated metering valve (24), and is mixed in the spray tube (12) with compressed air, and in which the reagent mixed with compressed air is introduced by means of the spray tube (12) into an exhaust gas duct (10) and is atomized, and a device for carrying out the method. The procedure according to the invention is distinguished in that the duration of the metering valve activation signal (34) is corrected depending on the differential pressure between the hydraulic pressure (p_Rea_hyd) of the reagent in the metering valve (24) and the pneumatic pressure (p_D_pneu) in the spray tube (12). The procedure according to the invention permits a high degree of accuracy in the metering of the reagent.
摘要:
Provided are methods and nucleic acids for detecting, differentiating or distinguishing between colon cell proliferative disorders by analysis of one or more of the genes Versican, TPEF, H-Cadherin, Calcitonin, and EYA4. Further provided are novel nucleic acid sequences useful for the cell proliferative disorder specific analysis of said genes as well as methods, assays and kits thereof.
摘要:
The invention provides methods and nucleic acids for detecting, differentiating or distinguishing between colon cell proliferative disorders as well as therapy thereof by analysis of the gene EYA4 and its promoter and regulatory sequences. The invention further provides novel nucleic acid sequences useful for the cell proliferative disorder specific analysis of said gene as well as methods, assays and kits thereof.