Special oil injection device for highpressure common rail

Abstract

The invention relates to the technical field of oil injection for vehicle high pressure common rail, in particular to a special oil injection device for highpressure common rail. The device comprises a control piston and an oil injection device body. The control piston, the oil injection device body and a porous plate form a high temperature common rail control cavity. According to the special oil injection device for highpressure common rail, through the reasonable design of the porous plate bottom surface and the control of the shape of the piston top portion, when the oil injection device sprays oil, a throttling ring belt is formed at the bottom surface of the control piston and the porous plate to create an throttling effect, thus the dynamic oil return of the oil injection device is greatly decreased, the heating of the oil injection device is reduced, the power loss of a oil supply pump is reduced. At the same time, the precise design of the throttling ring belt clearance between the porous plate and the control piston head part can make the piston be at a complete floating condition after the piston is completely lifted, therefore hydraulic pressure balance automatic floating regulation is used for controlling the throttling ring clearance between the control piston and the porous plate bottom surface, thus the difference of high pressure common rail control cavity pressure caused by the difference of throttling ring belt clearance derived from assembly errors is reduced, and the assembly consistency of the oil injection device is improved.

Description

technical field [0001] The invention relates to the technical field of high-pressure common rail fuel injection for automobiles, in particular to a special fuel injection device for high-pressure common rail. Background technique [0002] In order to meet increasingly stringent emission regulations, fuel system injection pressures are getting higher and higher. As the injection pressure increases, the dynamic oil return of the injector becomes larger and larger. The increase of the dynamic oil return of the injector will increase the energy consumption of the fuel supply pump and reduce the economy of the fuel system. At the same time, more high-pressure fuel leaks into the low-pressure oil circuit, which will lead to higher temperature of the low-pressure oil circuit in the injector, which will affect the stability and reliability of the injector. In addition, it can be seen from the working principle of the fuel injector that the fuel injector controls the rise or fall o...

AI Technical Summary

Problems solved by technology

This causes the fuel pressure in the control chamber to decrease greatly, resulting in a slower recovery of the fuel pressure in the control chamber at the end of the injection, and a longer delay in the closing of the injector, resulting in poor fuel injection sensitivity of the injector , which limits the improvement of the injector's multiple injection capability

Images