Fuel injection valve for internal combustion engine
A technology of fuel injection and internal combustion engine, which is applied in the direction of fuel injection device, special fuel injection device, mechanical equipment, etc., and can solve the problems such as the inability of fuel to pass through it, the unstable operation of the needle valve of the fuel injection valve, and the triggering obstacle.
Inactive Publication Date: 2006-10-25
BOSCH CORP
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Problems solved by technology
Therefore, there is a problem that, depending on the operating conditions of the engine, when the engine is started at a low temperature such as -20°C or lower, the wax mixed in the fuel is deposited in various parts of the fuel injection valve, thereby causing various problems
Especially when wax deposits in the fuel leakage channel for the fuel to flow from the high-pressure side to the low-pressure side, there is a tendency that the fuel cannot pass through it, and the operation of the fuel injection valve, especially the needle valve of the injector Operation becomes unstable
As a result, a trigger obstacle is generated, making the fuel injection operation of the fuel injection valve unstable
Method used
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[0014] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0015] figure 1 is a sectional view showing an example of an embodiment of the fuel injection valve of the present invention. Reference numeral 1 denotes a fuel injection valve for an internal combustion engine in a fuel injection common rail device for injecting / supplying fuel to a diesel internal combustion engine. Fuel injection valve 1 is connected to a cylinder of a diesel internal combustion engine not shown for directly injecting / supplying just the required amount of high-pressure fuel supplied from a common rail not shown into the cylinder at a desired timing, and includes fixing at the injection The fuel injection nozzle 3 and the holding nut 4 at the front end of the nozzle holder 2. The solenoid valve 5 is arranged at the end of the nozzle holding seat 2 .
[0016] The nozzle holder 2 includes a hollow body 22, wherein a guide hole 21 is formed along th...
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A fuel injection valve (1), wherein a nozzle (3) formed so that a nozzle needle (32) inserted into a guide hole (33) in a nozzle body (31) is axially moved along a guide hole (33) to open and close a nozzle hole (35) is fixed to the tip part of a nozzle holder (2) to prevent the nozzle from being unstably operated even if wax components contained in fuel are solidified. A tapered part (33B) diverging toward the nozzle holder (2) is formed on the surface of the guide hole (33). Thus, when the components contained in the fuel are solidified, solid matters can be rapidly discharged from a clearance (G) functioning as a fuel leakage passage formed between the nozzle needle (32) and the guide hole (33).
Description
technical field [0001] The present invention relates to a fuel injection valve for directly injecting / supplying fuel into cylinders of an internal combustion engine. Background technique [0002] As a fuel injection valve for directly injecting / supplying fuel into cylinders of an internal combustion engine such as in a fuel injection common rail device, there is known a fuel injection valve of the type disclosed in, for example, JP-A-7-310621. This fuel injection valve is constructed to energize and open a solenoid valve so that the control chamber in the body of the fuel injection valve communicates with the low pressure portion, thereby removing the back pressure on the valve piston, lifting the injector needle, Initiate fuel injection, stop power supply to the solenoid valve after a predetermined time, and release the communication state between the control chamber and the low pressure part, so that the predetermined back pressure acts on the valve piston, pushing the inj...
Claims
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IPC IPC(8): F02M61/10F02M61/12F02M61/16
CPCF02M55/002F02M61/12F02M2200/07F02M61/10F02M61/16
Inventor 野崎浩明松崎清司
Owner BOSCH CORP