Oil injector bush

Abstract

The invention discloses an oil injector bush. The oil injector bush comprises a bush body, wherein the bush body comprises an upper bush which is arranged corresponding to an oil injector to be cooled, and a lower bush which is arranged corresponding to an oil injecting port to be cooled; the upper bush and the lower bush are integrally structured; the lower bush is thicker than the upper bush; anouter bush sleeves the lower bush; an inner water cavity for cooling the oil injecting port is formed between the lower bush and the outer bush; and a water inlet channel and a water outlet channel which communicate with a cooling water chamber are formed in the outer bush. According to the oil injector bush, the oil injecting port is basically enclosed by the inner water cavity; the outer bush is additionally arranged, so that the overall strength of the bush body can be ensured, and on that basis, the lower bush and a connecting plate are small in size, thus the heat transferring coefficient is increased, and the cooling effect is improved. With the adoption of the oil injector bush, the heat load of the oil injecting port can be decreased; the maximum height of the oil injecting port is controlled; the oil injecting port of the oil injector is controlled within a certain range, and thus the reliability of a diesel engine in working can be ensured.

Description

technical field [0001] The invention relates to a fuel injector bushing. Background technique [0002] The fuel injector bushing is installed in the cylinder head, and a water cavity for cooling is formed between the outside and the cylinder head. The fuel injector is installed inside the fuel injector bushing, and the fuel injector is installed at the lower end of the fuel injector to control fuel injection. . At present, the degree of strengthening of diesel engines is getting higher and higher, and the thermal load of fuel injectors is also increasing. The fuel injector nozzle has strict requirements on the temperature range, generally more than 100 degrees Celsius to about 200 degrees Celsius. [0003] Such as figure 1 As shown, at present, the injector bushing is a thin-walled rotary body made of alloy steel. The lower end of the injector bushing is assembled in the cylinder head through interference fit or threaded connection, and the upper end is fitted with the cy...

AI Technical Summary

Problems solved by technology

The nozzle of the fuel injector is in contact with the combustion chamber, and the heat load temperature is very high. With the continuous improvement of the current diesel engine, the heat load of the fuel injector will become higher and higher; It is used to support the bushing as a whole on the cylinder head, so the water chamber cannot be installed at the nozzle of the fuel injector. The water chamber of the fuel injector bushing is in the middle and upper part, the heat transfer coefficient is low, the cooling effect is not good, and the strengthening degree High diesel engine may cause fuel injector failure due to poor cooling, such as needle valve sticking, carbon deposits, etc., affecting the normal operation of the diesel engine

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