Monomer pump type electronic control fuel injection system

Abstract

The utility model relates to the technical field of electronic control fuel injection systems, in particular to a monoblock pump type electronic control fuel injection system which comprises an electronic control monoblock pump and a cam, a protective cover is arranged on the surface of the electronic control monoblock pump, the protective cover is connected with a connecting block in a sliding mode, and an oil containing groove is annularly formed in the lower inner wall of the protective cover. An oil discharge channel is arranged on the lower inner wall of the oil containing groove and communicated with a pipeline, one end of the pipeline is communicated with an oil storage device, a flange is arranged on the surface of the protective cover, and a plurality of adjusting devices are arranged on the flange. By means of the adjusting device, the installation gap between the electronic unit pump and the cam can be conveniently and rapidly adjusted; if fuel oil leaks from the electronic unit pump, one part of fuel oil can drop onto the connecting block through the plunger, and excessive fuel oil can flow into the oil containing groove; the other part slides into the oil containing groove through the inner wall of the protective cover; and the fuel oil does not drop on the cam to pollute the cam.

Description

Technical Field

[0001] This utility model relates to the field of electronic fuel injection system technology, and in particular to a single-unit pump type electronic fuel injection system. Background Technology

[0002] In recent years, diesel engine electronic fuel injection technology has developed rapidly, and more and more diesel engines are equipped with electronic fuel injection systems.

[0003] For example, the authorized publication number "CN203430672U" is titled "Electrically Controlled Unit Pump Fuel Injection System." This utility model ensures that the injector injects fuel at the correct time and in the correct quantity, achieving good fuel economy. This utility model reduces emissions and improves fuel economy. The operation and control of this utility model are automated.

[0004] It has high reliability.

[0005] The above-mentioned and existing technologies have the following drawbacks: when the electronically controlled unit pump is used with the cam, the installation gap is not easy to adjust; at the same time, if the electronically controlled unit pump leaks fuel, it will drip onto the cam through the plunger of the electronically controlled unit pump, causing cam contamination, and long-term use will cause the injection system to malfunction. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a single-unit pump-type electronic fuel injection system.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] Design a unit pump type electronic fuel injection system, including an electronically controlled unit pump and a cam. The inlet end of the electronically controlled unit pump is equipped with an inlet solenoid valve, which is connected to an electric fuel pump through a fuel delivery pipe. The outlet end of the electronically controlled unit pump is connected to an injector through a high-pressure fuel pipe. The lower end of the electronically controlled unit pump is equipped with a plunger, and the lower end of the plunger is rotatably connected to a roller through a connecting block. The lower end of the roller contacts the surface of the cam. A return spring is provided between the electronically controlled unit pump and the connecting block. The surface of the electronically controlled unit pump is equipped with a protective cover, which is slidably connected to the connecting block. The lower inner wall of the protective cover is provided with an annular oil receiving groove, and the lower inner wall of the oil receiving groove is provided with an oil unloading channel, which is connected to a pipe. One end of the pipe is connected to an oil storage device. The surface of the protective cover is equipped with a flange, and the flange surface is provided with multiple mounting holes and multiple adjustment devices.

[0009] Preferably, the adjusting device includes an adjusting hole disposed on the flange surface, an adjusting screw threadedly connected inside the adjusting hole, a first limiting end block at the upper end of the adjusting screw, a second limiting end block at the lower end of the adjusting screw, and a fixing nut disposed below the flange threadedly connected to the surface of the adjusting screw.

[0010] Preferably, the oil storage device includes an oil tank and an oil level sensor, with a pipe connected to one side surface of the oil tank and the oil level sensor disposed on the upper surface of the oil tank.

[0011] Preferably, the protective cover has an annular mounting groove on its surface, and a plurality of oil drain holes are provided on the inner wall of one side of the mounting groove, the oil drain holes being inclined downward from the outside to the inside.

[0012] Preferably, the surface of the protective cover is provided with an oil-proof protrusion in a ring shape below the mounting groove.

[0013] Preferably, the sidewall of the oil tank is inclined toward the oil unloading channel.

[0014] The present invention proposes a unit pump-type electronic fuel injection system with the following advantages: The adjustment device, via bolts passing through mounting holes and threaded connections to nuts, initially secures the electronic unit pump to the fixing component. Then, by tightening the first limiting end block, the adjusting screw rotates, bringing the cam and plunger to the appropriate position. The fixing nut can then be tightened for final fixation, and the bolts passing through the mounting holes are then fastened to the nut. This allows for convenient and quick adjustment of the installation gap between the electronic unit pump and the cam. If fuel leaks from the electronic unit pump, some fuel will drip onto the connecting block through the plunger, preventing it from dripping onto the cam. Excess fuel will flow into the oil reservoir. The remaining fuel will slide down the inner wall of the protective cover into the oil reservoir. The fuel in the oil reservoir flows into the oil storage tank of the oil storage device through the unloading channel and pipes. A fuel level sensor transmits the signal to the vehicle control terminal to determine the leakage situation. In summary, fuel will not drip onto the cam, causing cam contamination and preventing malfunctions of the injection system after prolonged use. Attached Figure Description

[0015] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the electrically controlled unit pump of this utility model;

[0017] Figure 3 This is an enlarged view of position A in this utility model;

[0018] Figure 4 This is an enlarged view of position B of this utility model.

[0019] In the diagram: 1. Electronically controlled unit pump; 2. Cam; 3. Inlet solenoid valve; 4. Oil delivery pipe; 5. Electric oil delivery pump; 6. High-pressure oil pipe; 7. Injector; 8. Plunger; 9. Connecting block; 10. Roller; 11. Return spring; 12. Protective cover; 13. Oil tank; 14. Unloading channel; 15. Pipe; 16. Flange; 17. Mounting hole; 18. Adjusting hole; 19. Adjusting screw; 20. First limit end block; 21. Second limit end block; 22. Fixing nut; 23. Oil reservoir; 24. Oil level sensor; 25. Mounting groove; 26. Unloading hole; 27. Oil-proof protrusion. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figure 1-4 A unit pump type electronic fuel injection system includes an electronically controlled unit pump 1 and a cam 2. The inlet end of the electronically controlled unit pump 1 is equipped with an inlet solenoid valve 3, which is connected to an electric fuel pump 5 through a fuel delivery pipe 4. The outlet end of the electronically controlled unit pump 1 is connected to an injector 7 through a high-pressure fuel pipe 6. The lower end of the electronically controlled unit pump 1 is equipped with a plunger 8, and the lower end of the plunger 8 is rotatably connected to a roller 10 through a connecting block 9. The lower end of the roller 10 contacts the surface of the cam 2. A return spring 11 is provided between the electronically controlled unit pump 1 and the connecting block 9. The surface of the electronically controlled unit pump 1 is equipped with a protective cover 12, which is slidably connected to the connecting block 9. The lower inner wall of the protective cover 12 is provided with an oil receiving groove 13, and the lower inner wall of the oil receiving groove 13 is provided with an oil unloading channel 14, which is connected to a pipe 15. One end of the pipe 15 is connected to an oil storage device. The surface of the protective cover 12 is equipped with a flange 16, which is provided with multiple mounting holes 17 and multiple adjustment devices.

[0022] The adjusting device includes an adjusting hole 18, which is provided on the surface of the flange 16. An adjusting screw 19 is threadedly connected inside the adjusting hole 18. A first limiting end block 20 is provided at the upper end of the adjusting screw 19, and a second limiting end block 21 is provided at the lower end of the adjusting screw 19. A fixing nut 22 is threadedly connected to the surface of the adjusting screw 19 and is provided below the flange 16.

[0023] The oil storage device includes an oil tank 23 and an oil level sensor 24. One side surface of the oil tank 23 is connected to a pipe 15, and the oil level sensor 24 is installed on the upper surface of the oil tank 23.

[0024] The protective cover 12 has an annular mounting groove 25 on its surface. The inner wall of one side of the mounting groove 25 has multiple oil discharge holes 26. The oil discharge holes 26 are inclined downward from the outside to the inside, so that fuel can enter the interior of the protective cover 12 through the oil discharge holes 26 along the outer wall of the protective cover 12 and then flow into the oil tank 13.

[0025] An oil-proof protrusion 27 is provided in a ring on the surface of the protective cover 12 below the mounting groove 25. The oil-proof protrusion 27 serves to block the fuel, allowing the fuel gas to enter the interior of the protective cover 12 through the mounting groove 25 and the oil discharge hole 26, and then flow into the oil container 13.

[0026] The sidewall of the oil tank 13 is inclined toward the unloading channel 14 to facilitate the flow of fuel into the unloading channel 14.

[0027] Working principle: Fuel is drawn from the fuel tank by the electric fuel pump 5 and input into the electronically controlled unit pump 1. The amount of fuel entering the electronically controlled unit pump 1 is regulated by the fuel inlet solenoid valve 3. The electronically controlled unit pump 1 then delivers high-pressure fuel to the injector 7 through the high-pressure fuel line 6. An adjustment device is installed, with bolts passing through the mounting hole 17 and then threadedly connected to the nut to initially fix the electronically controlled unit pump 1 to the fixing component. Then, by turning the first limit end block 20, the adjusting screw 19 is rotated, so that the cam 2 and the plunger 8 are in the appropriate position. The fixing nut 22 can then be turned to secure it, and the bolts passing through the mounting hole 17 and the nut are tightened. This allows for convenient and quick adjustment of the installation gap between the electronically controlled unit pump 1 and the cam 2. If fuel leakage occurs in the electronically controlled unit pump 1, some of it will leak through the plunger... The fuel dripping from plug 8 onto connecting block 9 will not drip onto cam 2. Excess fuel will flow into the fuel tank 13; another portion will slide down the inner wall of protective cover 12 into the fuel tank 13; and yet another portion will slide down through the unloading hole 26 on the outer wall of protective cover 12 into the fuel tank 13. The fuel in the fuel tank 13 flows into the fuel reservoir 23 through the unloading channel 14 and pipe 15. The fuel level sensor 24 transmits the signal to the vehicle control terminal to determine the fuel leakage situation and prevent the injection system from malfunctioning due to prolonged use.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A unit pump type electronically controlled fuel injection system, comprising an electronically controlled unit pump (1) and a cam (2), characterized in that, The inlet end of the electronically controlled unit pump (1) is equipped with an inlet solenoid valve (3), which is connected to an electric oil pump (5) through an oil delivery pipe (4). The outlet end of the electronically controlled unit pump (1) is connected to an injector (7) through a high-pressure oil pipe (6). The lower end of the electronically controlled unit pump (1) is equipped with a plunger (8), which is rotatably connected to a roller (10) through a connecting block (9). The lower end of the roller (10) is in contact with the surface of the cam (2). A return spring (11) is provided between the electronically controlled unit pump (1) and the connecting block (9). The surface of the electrically controlled unit pump (1) is provided with a protective cover (12), the protective cover (12) is slidably connected to the connecting block (9), the lower inner wall of the protective cover (12) is provided with an oil-containing groove (13), the lower inner wall of the oil-containing groove (13) is provided with an oil unloading channel (14), the oil unloading channel (14) is connected to a pipe (15), one end of the pipe (15) is connected to an oil storage device, the surface of the protective cover (12) is provided with a flange (16), the surface of the flange (16) is provided with multiple mounting holes (17), and the flange (16) is provided with multiple adjustment devices.

2. The unit pump type electronic fuel injection system according to claim 1, characterized in that, The adjusting device includes an adjusting hole (18), which is disposed on the surface of the flange (16). An adjusting screw (19) is threadedly connected inside the adjusting hole (18). A first limiting end block (20) is provided at the upper end of the adjusting screw (19), and a second limiting end block (21) is provided at the lower end of the adjusting screw (19). A fixing nut (22) disposed below the flange (16) is threadedly connected to the surface of the adjusting screw (19).

3. The unit pump type electronic fuel injection system according to claim 1, characterized in that, The oil storage device includes an oil tank (23) and an oil level sensor (24). One side surface of the oil tank (23) is connected to a pipe (15), and the oil level sensor (24) is installed on the upper surface of the oil tank (23).

4. The unit pump type electronic fuel injection system according to claim 1, characterized in that, The protective cover (12) has an annular mounting groove (25) on its surface. The inner wall of one side of the mounting groove (25) has multiple oil discharge holes (26), which are inclined downward from the outside to the inside.

5. A single-unit pump-type electronic fuel injection system according to claim 4, characterized in that, The protective cover (12) has an oil-proof protrusion (27) circumferentially located below the mounting groove (25) on its surface.

6. The unit pump type electronic fuel injection system according to claim 1, characterized in that, The sidewall of the oil tank (13) is inclined toward the oil unloading channel (14).

Images