Double-cylinder line-up fuel injection pump for diesel engine

Abstract

The invention discloses a double-cylinder line-up fuel injection pump for a diesel engine, which comprises a shell, wherein a hold-on body component is fixedly arranged at the lower end of the shell; an isobaric delivery valve component arranged on the upper part of a plunger and barrel assembly is arranged in the shell; the plunger and barrel assembly is connected with a control sleeve gear; a control rack matched with the control sleeve gear is arranged on the side wall of the shell; and a gasket for the pre-stroke adjustment of fuel is arranged between the plunger and barrel assembly and the upper end face of the shell. The double-cylinder line-up fuel injection pump is reasonable in design and convenient for regulation, has a small volume, fewer motion parts and light weight, is suitable for high-speed direct injection, saves the fuel, is favorable for environmental protection; the double-cylinder line-up fuel injection pump is suitable for the high-speed direct injection diesel engine, so that the miniaturization, high speed and direct injection of the double-cylinder diesel engine with small cylinder diameters are realized; and the double-cylinder line-up fuel injection pump has the advantages of novel structure, high performance, low fuel consumption, low discharge, stable injection and the like.

Description

technical field [0001] The invention relates to a diesel engine fuel injection pump, in particular to a diesel engine double-cylinder split fuel injection pump. Background technique [0002] The existing dual-cylinder split-type fuel injection pump for diesel engines has a sleeve-type plunger coupling in the casing. The plunger sleeve is positioned by the adjustment pin, and then compressed with the tight seat of the oil outlet valve, so that the fuel supply of the two cylinders is even. The degree can only be adjusted by the adjustment pin, but the adjustment range is small, and the tight seat of the oil outlet valve must be loosened during adjustment, which is time-consuming to adjust. The diameter of the lower end of the plunger sleeve is limited, but it has to support and adjust parts such as the gear sleeve, so the rigidity is poor, and it is prone to deformation during use, resulting in the plunger being seized. The oil supply pre-stroke of the two cylinders can only ...

AI Technical Summary

Problems solved by technology

The oil outlet valve adopts a throttling oil outlet valve. When the speed is high, the fuel pressure in the plunger cavity increases due to the throttling effect, and the circulating oil supply decreases; when the speed is low, the fuel supply increases, thereby improving the speed. Features, the oil outlet valve is equipped with a lift limiter, the lift of this oil outlet valve is difficult to control, and it is prone to secondary injection at high speed, unstable injection at low speed, and cavitation in the high pressure chamber.

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