Electronic injection general double-cylinder engine

Abstract

The utility model discloses an electronic injection general double-cylinder engine which comprises a crankcase body, a first air cylinder, a second air cylinder, an air inlet manifold and a fuel pump, the first air cylinder and the second air cylinder are arranged on the top of the crankcase body, and the air inlet manifold is located between the first air cylinder and the second air cylinder. A throttle valve body communicated with the intake manifold is arranged between the first air cylinder and the second air cylinder, the throttle valve body is connected with a throttle valve control device, the end, away from the intake manifold, of the throttle valve body is connected with a fuel injection device, and the fuel pump is connected to the upper portion of the first air cylinder and located above the intake manifold. An oil injection opening of the fuel pump is located above the fuel injection device and communicated with the fuel injection device through a fuel pipe. According to the scheme, the problem that in the prior art, a double-cylinder engine is prone to fuel injection difficulty is solved.

Description

Technical Field

[0001] The utility model relates to an electronically-injected universal double-cylinder engine. Background Art

[0002] The electronic fuel injection universal twin-cylinder engine is an engine that uses a fuel pump to inject fuel into the combustion chamber of the engine. In a twin-cylinder engine, the fuel pump used to provide power to the fuel is generally set on the side of the engine crankcase, and the fuel pump is connected to the fuel injection device through a fuel pipe. When using a twin-cylinder engine, it is found that the fuel supply path is too long, which leads to air plugging in the fuel supply.

[0003] Chinese patent document CN113825899B discloses an internal combustion engine, including a first fuel pump, which draws fuel through a fuel filter; and a second fuel pump, which supplies the fuel to a fuel injection device, the internal combustion engine is characterized in that it has: a first fuel piping, which connects the fuel filter with the first fuel pump and the second fuel pump, the second fuel pump being set to a high pressure compared to the pressure of the first fuel pump; and a second fuel piping, which connects the second fuel pump with the fuel injection device, the fuel injection device injects fuel into a combustion chamber formed in a cylinder portion of the internal combustion engine, a shielding wall covering the outside of the cylinder portion is provided between at least a portion of the second fuel piping and the cylinder portion, the shielding wall having a retaining portion for retaining at least the first fuel piping and the second fuel piping.

[0004] The prior art solution separates the second fuel pipe connected to the fuel injection device from the cylinder portion by the shielding wall, so that the second fuel pipe can reduce the heat received from the cylinder portion due to thermal insulation, thereby reducing the gas lock phenomenon caused by fuel vaporization.

[0005] Although the solution of the prior art reduces the gas plug phenomenon caused by fuel gasification, the setting of the shielding wall will increase the difficulty of engine assembly, which is not conducive to the miniaturization of the engine. In addition, when the two-cylinder engine shares a throttle valve body and a fuel injection device, the path of the fuel pipe connecting the fuel pump and the fuel injection device is long, which can easily make the initial start-up time of the engine longer; and after the engine is tested, it is not easy to empty the fuel in the fuel pipe, which can easily lead to safety accidents during transportation. Utility Model Content

[0006] The utility model aims to provide an electronic fuel injection universal twin-cylinder engine to solve the problems in the prior art that the twin-cylinder engine is prone to long initial start-up time and difficult fuel discharge, which may lead to transportation safety accidents.

[0007] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides an electronic fuel injection universal two-cylinder engine, including a crankcase, a first cylinder, a second cylinder, an intake manifold and a fuel pump, wherein the first cylinder and the second cylinder are arranged at the top of the crankcase, the intake manifold is located between the first cylinder and the second cylinder, a throttle valve body connected to the intake manifold is arranged between the first cylinder and the second cylinder, the throttle valve body is connected to a throttle control device, one end of the throttle valve body away from the intake manifold is connected to a fuel injection device, the fuel pump is connected to the upper part of the first cylinder and is located above the intake manifold, the fuel injection port of the fuel pump is located above the fuel injection device, and the fuel injection port of the fuel pump is connected to the fuel injection device through a fuel pipe.

[0008] Preferably, the throttle control device is located on a side of the throttle valve body facing the second cylinder.

[0009] Preferably, a negative pressure pump is arranged above the throttle valve body.

[0010] Preferably, an intake pipe is connected to the upper side of the throttle valve body, and an intake end of the intake pipe faces the second cylinder.

[0011] Preferably, the negative pressure pump is installed on the air inlet pipe through a bracket.

[0012] Preferably, the injection direction of the fuel injection device is arranged parallel to the intake direction of the throttle valve body.

[0013] The utility model has the following beneficial effects:

[0014] 1. With the arrangement of the utility model, the injection port of the fuel pump is higher than the fuel injection device, so that the fuel pipe gradually extends downward from the end connected to the fuel pump and is finally connected to the fuel injection device, and the fuel pipe is directly extended from the upper part of the first cylinder toward the space area between the first cylinder and the second cylinder when arranged, so that there is a large distance between the fuel pipe and the first cylinder, thereby shortening the length of the fuel pipe and reducing the influence of the heat of the cylinder on the fuel pipe, thereby making it less likely that the fuel pipe will be difficult to transport fuel due to the gasification of the fuel.

[0015] 2. Compared with the prior art, the length of the fuel pipe connecting the fuel pump and the fuel injection device is greatly shortened, so that the fuel sprayed by the fuel pump can quickly enter the fuel injection device, which is conducive to greatly shortening the initial start-up time of the engine. At the same time, the fuel in the fuel pipe is easy to be emptied after the engine test, reducing safety accidents caused by residual fuel in the fuel pipe, which is conducive to improving the safety of engine transportation.

[0016] 3. The installation positions of the throttle control device, negative pressure pump, fuel pump and throttle valve body of the utility model are convenient for assembly operation and maintenance.

[0017] 4. The injection direction of the fuel injection device is set to facilitate better fuel entry into the two cylinders and improve the fuel delivery effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of an embodiment of an electronic fuel injection universal twin-cylinder engine of the utility model;

[0019] Figure 2 for Figure 1 Rear view along the crankshaft axis;

[0020] Figure 3 for Figure 2 Middle AA section view;

[0021] Figure 4 for Figure 3 Schematic diagram of the throttle body and fuel injection device;

[0022] Figure 5 for Figure 4 Middle BB section view. DETAILED DESCRIPTION

[0023] The following is further described in detail through specific implementation methods:

[0024] The figure marks in the drawings of the specification include: first cylinder 1, fuel pump 2, intake manifold 3, negative pressure pump 4, bracket 5, intake pipe 6, throttle valve body 7, throttle control device 8, intake elbow 9, second cylinder 10, fuel injection device 11, fuel pipe 12, crankcase 13, crankshaft 14, throttle valve plate 15, valve plate shaft 16.

[0025] The embodiment is basically as shown in the attached Figures 1 to 5As shown: an electronic fuel injection universal two-cylinder engine, including a crankcase 13, a first cylinder 1 and a second cylinder 10 are arranged on the top of the crankcase 13, and the first cylinder 1 and the second cylinder 10 are distributed in a V shape. An intake manifold 3 is arranged between the first cylinder 1 and the second cylinder 10. A throttle valve body 7 connected to the intake manifold 3 is arranged between the first cylinder 1 and the second cylinder 10. In this embodiment, the throttle valve body 7 is connected to the intake manifold 3 through an intake elbow 9. The throttle valve body 7 is connected to the throttle control device 8, and the opening and closing size of the throttle valve body 7 is controlled by the throttle control device 8. In this embodiment, the throttle control device 8 is located on the side of the throttle valve body 7 facing the second cylinder 10, and the throttle control device 8 is installed and fixed on the throttle valve body 7. A throttle valve plate 15 is arranged inside the throttle valve body 7. The throttle valve plate 15 is rotatably connected to the throttle valve body 7 through the valve plate shaft 16. The throttle control device 8 is connected to the valve plate shaft 16 to control the rotation of the valve plate shaft 16, thereby realizing the control of the opening angle of the throttle valve plate 15. In this embodiment, the throttle valve body 7 is connected to the intake manifold 3 through the intake elbow 9. The end of the throttle valve body 7 away from the intake manifold 3 is connected to the fuel injection device 11. In this embodiment, the fuel injection device 11 is located at the lower part of the throttle valve body 7, and the injection direction of the fuel injection device 11 is arranged parallel to the intake direction of the throttle valve body 7. The upper side of the throttle valve body 7 is connected to the intake pipe 6, and the intake end of the intake pipe 6 faces the second cylinder 10. A negative pressure pump 4 is provided above the throttle valve body 7 . In the present embodiment, the negative pressure pump 4 is located above the throttle valve body 7 and on one side of the first cylinder 1 . The negative pressure pump 4 is fixed to the intake pipe 6 via a bracket 5 .

[0026] A fuel pump 2 is provided on the upper part of the first cylinder 1, and the fuel pump 2 is located above the intake manifold 3. In this embodiment, the fuel pump 2 is located above the connection between the intake manifold 3 and the first cylinder 1, and is fixed to the first cylinder 1 through a mounting bracket. The fuel injection port of the fuel pump 2 is located above the fuel injection device 11, and is connected to the fuel injection device 11 through a fuel pipe 12, so that the fuel pump 2 delivers the fuel to the fuel injection device 11 through the fuel injection port and the fuel pipe 12 and sprays it into the throttle body 7. The height of the fuel pipe 12 gradually decreases from the fuel injection port to the fuel injection device 11, so that the gas in the fuel pipe 12 will move to the fuel pump 2 by itself under the action of buoyancy and will not stay in the fuel pipe 12, thereby avoiding the occurrence of gas plug phenomenon.

[0027] By adopting the setting of the utility model, the injection port of the fuel pump 2 is higher than the fuel injection device 11, so that the fuel pipe 12 gradually extends downward from the end connected to the fuel pump 2 and finally connects to the fuel injection device 11, and the fuel pipe 12 is directly extended from the upper part of the first cylinder 1 toward the space area between the first cylinder 1 and the second cylinder 10 when arranged, so that there is a large distance between the fuel pipe 12 and the first cylinder 1, thereby shortening the length of the fuel pipe 12 and reducing the influence of the heat of the cylinder on the fuel pipe 12, thereby making it less likely for the fuel pipe 12 to produce gas due to fuel gasification and cause fuel delivery difficulties. The installation position of the throttle control device 8, the negative pressure pump 4, the fuel pump 2 and the throttle valve body 7 of the utility model is convenient for assembly operation and maintenance. The injection direction of the fuel injection device 11 is set, which is conducive to better fuel entry into the two cylinders and improves the fuel delivery effect.

[0028] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. An electronic fuel injection universal two-cylinder engine, comprising a crankcase, a first cylinder, a second cylinder, an intake manifold and a fuel pump, wherein the first cylinder and the second cylinder are arranged on the top of the crankcase, and the intake manifold is located between the first cylinder and the second cylinder, characterized in that: A throttle valve body connected to the intake manifold is arranged between the first cylinder and the second cylinder, the throttle valve body is connected to a throttle control device, one end of the throttle valve body away from the intake manifold is connected to a fuel injection device, the fuel pump is connected to the upper part of the first cylinder and is located above the intake manifold, the fuel injection port of the fuel pump is located above the fuel injection device, and the fuel injection port of the fuel pump is connected to the fuel injection device through a fuel pipe.

2. The electronic fuel injection universal twin-cylinder engine according to claim 1, characterized in that: The throttle control device is located on a side of the throttle valve body facing the second cylinder.

3. The electronic fuel injection universal twin-cylinder engine according to claim 2, characterized in that: A negative pressure pump is arranged above the throttle valve body.

4. The electronic fuel injection universal twin-cylinder engine according to claim 3, characterized in that: An intake pipe is connected to the upper side of the throttle valve body, and an intake end of the intake pipe faces the second cylinder.

5. The electronic fuel injection universal twin-cylinder engine according to claim 4, characterized in that: The negative pressure pump is installed on the air inlet pipe through a bracket.

6. The electronic fuel injection universal twin-cylinder engine according to claim 5, characterized in that: The injection direction of the fuel injection device is arranged parallel to the intake direction of the throttle valve body.

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