High-pressure common-rail oil injector assembly capable of automatically compensating perpendicularity

Abstract

The high-pressure common-rail oil injector assembly capable of automatically compensating the perpendicularity comprises an oil injector shell, a control valve seat and a piston sleeve are arranged in the oil injector shell, and a piston sleeve seat is installed between the control valve seat and the piston sleeve; the hemisphere on the upper portion of the piston sleeve seat is in contact with the 75-degree sealing conical surface at the lower end of the control valve seat, the lower end face of the piston sleeve seat is in contact with the upper end face of the piston sleeve, the piston sleeve seat and the needle valve jointly form a control valve component, sealing is achieved under the action of spring force of the needle valve, and due to the fact that the upper portion of the piston sleeve seat is the hemisphere, perpendicularity and coaxiality between related parts can be effectively compensated. The flexibility and the sealing performance of all related parts are guaranteed, and the fuel injector can provide engine fuel oil regularly and quantitatively. The fuel injector adopts a static leakage-free structure, so that the static leakage of the fuel injector is zero, the fuel return quantity of the fuel injector is greatly reduced, and the effective power of an engine is improved.

Description

technical field [0001] The invention belongs to the technical field of high-pressure common rail electronically controlled fuel injector assemblies, and in particular relates to a high-pressure common rail fuel injector assembly that automatically compensates verticality. Background technique [0002] High-pressure common rail electronically controlled fuel injector assembly is used for non-road above National IV, road above National VI and above, and marine diesel engines. This fuel injector assembly not only meets the requirements of national emission regulations, but also has low fuel consumption, Good power, low noise, comfortable and so on. However, there is leakage in the control valve coupling and the needle valve coupling of the conventional common rail injector, so that the fuel injector assembly has a large oil return during operation, and the high-pressure oil pump in the fuel system needs to provide more fuel to maintain the normal operation of the engine. , the...

AI Technical Summary

Problems solved by technology

Part of the common rail injector assembly adopts a static non-leakage structure, but the piston sleeve is in direct contact with the control valve seat. It is difficult to seal the end face of the sleeve and the end face of the valve seat, and it affects the flexibility of the needle valve in the piston sleeve.

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