CN101302978B - A gasoline injection device for a vehicle - Google Patents

Abstract

The invention discloses a gasoline fuel injection device for vehicles, which has the following structure: an upper sleeve is connected with a lower sleeve, an oil injection orifice is fixed at the lower end of the lower sleeve, a needle valve is placed in the lower sleeve, and the needle valve includes a valve seat, Needle ball and needle tube, the valve seat is installed on the upper end of the needle tube, the needle ball is installed on the lower end of the needle tube; the spring is placed in the upper tube sleeve, the spring is equipped with a spring positioning pin, the filter screen is installed on the top of the upper tube sleeve, and the electromagnetic coil sleeve Outside the junction of the upper sleeve and the lower sleeve, the conjugate piece is mounted outside the electromagnetic coil. The device of the invention has high working reliability, light weight of the ball valve needle, short response time of the ball valve switch, simple structure, convenient processing and low cost. The device can be used in electronically controlled fuel injection systems of cars and motorcycles, can better control the fuel injection quantity and injection time, can improve the fuel utilization rate of cars and motorcycles, reduce exhaust gas emissions and reduce fuel consumption. The device according to the invention is particularly suitable for petrol engine injection systems.

Description

A gasoline injection device for a vehicle

technical field

The invention relates to a gasoline injection device for vehicles, especially for cars and motorcycles.

Background technique

Along with the raising of my country's people's material living standard, car has become one of important means of transportation, and more and more cars are put into use. The extensive use of cars causes a large amount of exhaust gas to be emitted, causing serious pollution to the atmosphere. The key to reducing the pollution of car exhaust to the atmosphere lies in the gasoline injection device for vehicles. At present, the gasoline injection devices for vehicles at home and abroad mainly include:

(1) Pin-type electromagnetic fuel injector. It consists of a housing, a needle valve, a needle valve seat and an electromagnetic coil. When the electromagnetic coil is not energized, the needle valve is pressed by the coil spring on the sealing cone valve seat at the outlet of the injector. When the electromagnetic coil is energized, a magnetic field is generated to drive the needle valve to rise by about 0.1mm, and the gasoline is fully atomized and flowed out from the precision annular gap. The axial needle injector has a large mass, and the acceleration is large when it is opened and closed. The impact and wear on the valve needle are relatively large, so that the needle valve will produce intermittent injection and jamming when it works for a long time, and the work reliability is poor.

(2) Disc valve electromagnetic injector. It consists of a valve plate and an orifice seat, and gasoline is injected from the top. When the injector is in the non-energized state (valve closed), the valve plate is pressed against the valve seat by the force of the coil spring and the hydraulic pressure. When the fuel injection pulse current from the ECU passes through the coil, a magnetic field is generated. Once the electromagnetic force exceeds the force of the coil spring and the hydraulic pressure, the valve plate begins to break away from the sealing ring on the valve seat, and gasoline enters the metering hole in the sealing ring of the valve seat to form a Atomized spray. The plate valve type electromagnetic fuel injector suffers from large hydraulic resistance during the closing process, and the required spring force is also large. When it is opened, it needs a larger electromagnetic force, which has higher requirements on the electromagnetic valve.

Contents of the invention

The object of the present invention is to provide a gasoline injection device for vehicles, which has high reliability, light weight of valve needle, short response time of opening and closing, simple structure and convenient processing.

The vehicle gasoline fuel injection device provided by the present invention has the following structure: the upper sleeve is connected with the lower sleeve, the fuel injection hole is fixed at the lower end of the lower sleeve, the needle valve is placed in the lower sleeve, and the needle valve includes a valve seat, a needle ball And the needle tube, the valve seat is installed on the upper end of the needle tube, the needle ball is installed on the lower end of the needle tube; the spring is placed in the upper tube sleeve, the spring is equipped with a spring positioning pin, the filter screen is installed on the top of the upper tube sleeve, and the electromagnetic coil is set on the upper end Outside the junction of the pipe sleeve and the lower pipe sleeve, the conjugate piece is installed outside the electromagnetic coil.

In order to overcome the shortcomings of the needle valve type electromagnetic fuel injector and the slice valve type electromagnetic fuel injector, the device of the present invention is designed as a ball valve type valve needle, the valve needle is hollow, and its mass is reduced to only half of the ordinary needle valve needle. The valve needle is subject to minimal shock and wear. The ball valve has the function of automatic positioning, no long guide rod is needed, and intermittent spraying and jamming will not occur. The ball valve adopts a short hollow needle tube with holes, so the hydraulic resistance suffered during the closing process is small, and the required spring force is small. In a word, compared with the traditional pintle type electromagnetic fuel injector and plate valve type electromagnetic fuel injector, the device of the present invention has high reliability, light weight, short response time of ball valve switch, simple structure, convenient processing and low cost. The device can be used in electronically controlled fuel injection systems of cars and motorcycles, can better control the fuel injection quantity and injection time, can improve the fuel utilization rate of cars and motorcycles, reduce exhaust gas emissions and reduce fuel consumption. The device according to the invention is particularly suitable for petrol engine injection systems.

Description of drawings

Fig. 1 is a schematic structural view of a gasoline fuel injection device for a vehicle of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and example the present invention is described in further detail.

As shown in Figure 1, the device of the present invention includes an oil injection orifice 1, a lower sleeve 2, a needle valve, an electromagnetic coil 4, a spring 5, a spring positioning pin 6, a filter screen 7, an upper sleeve 8, a conjugate piece 9, Valve seat 10, needle ball 11 and mist orifice plate 12.

The upper pipe sleeve 8 is connected with the lower sleeve pipe 2 . The fuel injection orifice 1 is fixed on the lower end of the lower pipe sleeve 2 . The needle valve includes a valve seat 10 , a needle ball 11 and a needle tube 3 , the valve seat 10 is installed on the upper end of the needle tube 3 , and the needle ball 11 is installed on the lower end of the needle tube 3 . The needle valve is placed in the lower sleeve 2, and the valve seat 10 is used for the positioning of the needle valve, which facilitates the linear movement of the needle valve in the upper and lower sleeves. The needle ball 11 on the needle valve makes the oil injection orifice at the lower end of the lower sleeve 2 1 and the hole is closed. The spring 5 is placed in the upper pipe sleeve 8 and is located on the top of the needle valve for controlling the needle valve so that the needle valve closes the oil injection orifice 1 and balances the force of the external magnetic field. A spring positioning pin 6 is installed on the spring 5 for controlling the position of the spring 5 . The filter screen 7 is installed on the top of the upper pipe sleeve 8 to prevent residues from entering the fuel injection nozzle. The conjugate piece 9 is installed outside the electromagnetic coil 4 for confining the magnetic field. The atomizing orifice plate 12 is located below the oil injection orifice sheet 1 to atomize the oil in the oil injection nozzle.

The electromagnetic coil 4 is set outside the joint of the upper sleeve 8 and the lower sleeve 2, and the electromagnetic coil 4 forms an alternating magnetic field after passing through an alternating current, which drives the needle valve to move back and forth to control the fuel injection volume.

Cr13Mo martensitic stainless steel is selected as the material of the fuel injection hole 1 and the needle valve, and Cr17Ni9Mo2 stainless steel is selected as the material of the lower sleeve 2 to increase its magnetic field strength to obtain a better fuel injection effect.

Example 1:

The fuel injection orifice 1 is made of Cr13Mo martensitic stainless steel, and a small hole of 0.2 mm is processed in the center of the orifice. The material of the lower pipe sleeve 2 is Cr17Ni9Mo2 stainless steel, and the fuel injection orifice 1 is welded to the lower end. The material of the needle valve is Cr13Mo martensitic stainless steel, which is located inside the lower casing, and the needle ball on the needle valve closes the small hole of the oil injection orifice 1. The electromagnetic coil 4 is made of constantan, and an alternating magnetic field is formed after passing through the alternating current, which drives the needle valve to move back and forth to control the fuel injection quantity. The material of the spring 5 is 2Cr17Ni9Mo, which mainly controls the needle valve so that the needle valve closes the oil injection orifice 1 and balances the external magnetic field force. The material of the spring positioning pin 6 is red copper, which is used to control the position of the spring 5 . The filter screen 7 is made of 18-8 stainless steel, which is used to prevent residues from entering the fuel injection nozzle. The material of the upper pipe sleeve 8 is Cr17Ni9Mo2 stainless steel, which is connected with the lower casing. The material of the conjugate sheet 9 is 1J50, which is used to confine the magnetic field. The material of the valve seat 10 is Cr13Mo martensitic stainless steel, which is used for the positioning of the needle valve and facilitates the linear movement of the needle valve on the upper and lower sleeve pipes. The material of the needle ball 11 is G15 steel, which is mainly used for sealing the oil injection orifice 1 . The atomizing orifice plate 12 is located at the oil injection hole, and its material is Cr13Mo martensitic stainless steel, so that the oil in the oil injection nozzle is atomized.

Each part of the fuel injection device of the present invention is processed by high-precision CNC numerical control processing technology, and the error of the assembly system should be controlled within 0.02mm.

According to the requirements of Example 1, three samples were produced for performance testing, and their performance parameters are shown in the following table:

Performance parameters Sample 1 Sample 2 Sample 3 Design requirements Spray start time (ms) 1.11 1.09 1.12 1.1±5% 3ms pulse width fuel injection volume (ml) 45.6 46.7 46.1 46.0±5%

Performance parameters Sample 1 Sample 2 Sample 3 Design requirements 6ms pulse width fuel injection volume (ml) 37.2 37.3 37.9 37.0±5% 9ms pulse width fuel injection volume (ml) 28.5 28.5 28.4 28.0±5% Inductance (mH) 27.7 26.3 25.8 26.0±5% Equivalent resistance (Ω) 19.1 18.7 18.4 18.0±5%

Claims (1)

1. motor petrol injection device is characterized in that:

Last pipe box (8) is connected with following pipe box (2), nozzle opening sheet (1) is fixed on down the lower end of pipe box (2), needle-valve is placed on down in the pipe box (2), needle-valve comprises valve seat (10), pin ball (11) and needle tubing (3), valve seat (10) is installed in the upper end of needle tubing (3), and pin ball (11) is installed in the lower end of needle tubing (3); Needle tubing (3) is the hollow of weak point and the needle tubing that has hole, and needle-valve can be done straight line motion in last pipe box (8) and following pipe box (2); Spring (5) is placed in the pipe box (8), and be positioned at the top of described needle-valve, spring holder (6) is installed on the spring (5), filter screen (7) is installed in the top of pipe box (8), electromagnetic coil (4) is enclosed within the outside, connecting part of pipe box (8) and following pipe box (2), and conjugate layers (9) is installed in outside the electromagnetic coil (4);

The material of nozzle opening sheet (1) is the Cr13Mo Martensitic Stain Less Steel; The material of needle-valve is the Cr13Mo Martensitic Stain Less Steel; The material of following pipe box (2) is the Cr17Ni9Mo2 stainless steel.

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