Fuel injection valve sleeve assembly

Abstract

The invention belongs to the technical field of fuel injectors, and discloses a fuel injection valve sleeve assembly which comprises a valve sleeve body and a throttling sleeve, wherein an operation groove and a control groove are respectively formed at two opposite sides of the valve sleeve body, the operation groove is communicated with the control groove through a first throttling hole, and anoil inlet hole communicated with the outside is formed in the side wall of the operation groove; the throttling sleeve is clamped at the bottom of the operation groove or the control groove, a secondthrottling hole and an inner side counter bore are formed at the two opposite sides of the throttling sleeve respectively, and an opening at one end of the second throttling hole is located in the inner side counter bore; the inner side counter bore is communicated with the first throttling hole, and the hole diameter of the first throttling hole and the hole diameter of the second throttling holeare both smaller than that of the inner side counter bore. According to the fuel injection valve sleeve assembly, because of the split clamping design of the valve sleeve body and the throttling sleeve, the machining and manufacturing difficulty and cost are reduced, and the secondary throttling can be achieved with lower cost.

Description

technical field [0001] The invention relates to the technical field of fuel injectors, in particular to a fuel injection valve sleeve assembly. Background technique [0002] The fuel injector is a device that injects fuel regularly and quantitatively into the combustion chamber of the engine according to the operating conditions of the engine and the working sequence of the cylinders. [0003] In the existing fuel injection valve sleeve structure, the oil outlet orifice has only one stage of throttling, that is, it only throttles once. This structure is relatively simple in processing and manufacturing, but in use, due to the weak throttling effect, the injection When the fuel flow rate is high, the risk of cavitation on the outlet end face of the oil outlet orifice is relatively high, which affects the reliability of the fuel injection valve sleeve and the entire injector, shortens its working life, and increases the use cost. [0004] In order to solve the above problems,...

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Problems solved by technology

[0003] In the existing fuel injection valve sleeve structure, the oil outlet orifice has only one stage of throttling, that is, it only throttles once. This structure is relatively simple in processing and manufacturing, but in use, due to the weak throttling effect, the injection When the fuel flow rate is high, the risk of cavitation on the outlet end face of the oil outlet orifice is relatively high, which affects the reliability of the fuel injection valve sleeve and the entire injector, shortens its working life, and increases the cost of use.

[0004] In order to solve the above problems, in the prior art, the oil outlet orifice on the valve sleeve of the fuel injection valve is usually processed into a two-stage throttling structure, that is, the oil outlet orifice is composed of the oil outlet orifice, the diffuser area, the outlet The constriction part consists of three sections. This structure can realize two-stage throttling of high-pressure oil, reduces the flow rate of high-pressure fuel, and reduces the risk of cavitation on the outlet end face of the oil outlet orifice. However, with this oil outlet The processing and molding of the fuel injection valve sleeve of the orifice is relatively difficult, and it is difficult to accurately control the flow of the throttling parts at both ends during the processing, the scrap rate is high, and the processing cost is high

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