Fuel supply device and universal double-cylinder engine

Abstract

The utility model discloses a fuel supply device which comprises an air inlet pipe, a throttle valve body, a fuel injection unit and an electronic control unit, the throttle valve body comprises a throttle valve plate, a throttle position sensor and a stepping motor, the throttle valve body is provided with an air inlet, and the electronic control unit controls the action of the throttle valve plate; wherein the electronic control unit is connected with the throttle valve body, mounting holes for fixing the throttle valve body are formed in the two sides of the air inlet, and the mounting hole in one side and the mounting hole in the other side are in central symmetry along the air inlet. The utility model further discloses a general double-cylinder engine comprising the fuel supply device. According to the utility model, the throttle valve body can adapt to engines with different specifications, and the compatibility of the throttle valve body and the engines with various specifications is improved, so that the cost of a mold can be reduced, and the cost of the engines is also reduced.

Description

Technical Field

[0001] The utility model relates to a fuel supply device, in particular to a fuel supply device which is convenient to maintain and a universal double-cylinder engine. Background Art

[0002] The task of the fuel supply system is to prepare a certain amount and concentration of combustible mixture according to the requirements of various working conditions of the engine, supply it into the cylinder, ignite it and burn it near the end of compression to expand and do work, and finally discharge the exhaust gas in the cylinder into the atmosphere. Among them, the throttle valve, as a key component of intake control, has been widely used in vehicle engines and general engines. For example, a technology disclosed in Japanese Patent Publication No. 2005-98178 is achieved in the following way: the motor that drives the throttle valve to open and close and the throttle sensor that detects the opening of the throttle valve are installed on the first side wall of the throttle body at one end of the valve stem supporting the throttle valve; the throttle sensor that detects the operation amount of the throttle operating component is installed on the second side wall of the throttle body supporting the other end of the valve stem; the fuel injection valve that injects fuel into the intake passage downstream of the throttle valve is installed on the third side wall of the throttle body connecting the upper end of the first and second side walls. In this case, the electronic control unit that controls the throttle opening by actuating the electric motor according to the detection signals of the accelerator sensor and the throttle sensor is usually installed on the vehicle body or the engine. Due to its structural design, the electronic control unit requires a separate installation position, which is not conducive to the integration of the engine. In addition, the connection between each sensor and the electronic control unit requires a long wiring harness connection, which may affect the operating reliability and durability of the engine.

[0003] Another Chinese patent document CN101592086B discloses a technology called "universal engine intake control device", which is realized in the following way: wiring around the throttle body to electrically connect the intake control elements and greatly shorten the wires. It consists of the following components: a motor that drives the throttle to open and close, which is installed on the first side wall of the throttle body at one end of the valve stem supporting the throttle; a sensor unit that detects the throttle opening, which is installed on the second side wall supporting the other end of the valve stem; a fuel injection valve, which is installed on the third side wall that connects the upper ends of the first and second side walls to each other, and injects fuel into the intake passage downstream of the throttle; and an electronic control unit, which is installed on the fourth side wall opposite to the third side wall; the electronic control unit is connected to the motor, the fuel injection valve and the sensor unit through the first, second and third wires respectively. Due to its structural design, the wiring harness between the intake control elements is shortened, ensuring the stability of operation. However, due to the fixed position layout between the control elements, the compatibility of the intake control device with other engines is greatly reduced, and the cost of the mold is increased. Utility Model Content

[0004] In order to solve the technical problem of high engine cost in the prior art, the utility model provides a fuel supply device, comprising an intake pipe, a throttle valve body, a fuel injection unit and an electronic control unit, the throttle valve body comprising a throttle valve plate, a throttle position sensor and a stepper motor, the throttle valve body is provided with an air inlet, and the electronic control unit controls the movement of the throttle valve plate; wherein: the electronic control unit is connected to the throttle valve body, mounting holes for fixing the throttle valve body are provided on both sides of the air inlet, and the mounting holes on one side are symmetrical with the mounting holes on the other side along the center of the air inlet.

[0005] Compared with the prior art, in this solution, after mounting holes are provided on both sides of the air inlet, during the installation of the throttle valve body, the installation position of the throttle valve body on the engine can be adjusted according to the installation positions of the components on the throttle valve body, so that the throttle valve body can adapt to engines of different specifications, thereby improving the compatibility of the throttle valve body with engines of various specifications, thereby reducing the cost of the mold and thus reducing the cost of the engine.

[0006] Preferably, the throttle valve body has a mounting surface A and a mounting surface B arranged opposite to each other, and mounting positions for the electronic control unit are arranged on both the mounting surface A and the mounting surface B. In this solution, the compatibility of the throttle valve body and the engine can be further improved by mounting the electronic control unit on different mounting surfaces of the throttle valve body.

[0007] Preferably, the throttle valve body has a mounting surface C and a mounting surface D which are arranged opposite to each other, and the stepper motor and the throttle position sensor are respectively mounted on the mounting surface C and the mounting surface D. This solution can further improve the compatibility of the throttle valve body and the engine.

[0008] Preferably, a mounting bracket is provided on the mounting surface where the stepper motor is mounted, and the stepper motor is mounted on the corresponding mounting surface through the mounting bracket. This solution realizes the installation of the stepper motor on the throttle valve body.

[0009] Preferably, a mounting seat is provided on the mounting surface where the throttle position sensor is mounted, and the throttle position sensor is connected to the mounting seat. This solution realizes the installation of the throttle position sensor on the throttle valve body.

[0010] Preferably, it also includes a fuel pump and a negative pressure pump, the negative pressure pump is connected to the fuel pump, the negative pressure pump is located on one side of the intake pipe and is assembled on the intake pipe through a mounting bracket. This solution can ensure the normal supply of fuel, avoid interference between various components, and facilitate the layout of pipelines.

[0011] Preferably, the negative pressure pump is arranged on a side of the intake pipe close to the fuel pump. This solution can shorten the pipeline between the negative pressure pump and the fuel pump, and facilitate the layout of the pipeline.

[0012] Preferably, the negative pressure pump is located above the throttle valve body. This solution can avoid interference between the negative pressure pump and the electronic control unit, making maintenance of the electronic control unit more convenient.

[0013] Preferably, the negative pressure pump is mounted on the lower end surface of the mounting bracket. This solution protects the negative pressure pump while achieving the assembly of the negative pressure pump.

[0014] Preferably, the mounting bracket is provided with a raised opening portion, and the opening portion is provided with a through hole. This solution can ensure the installation and heat dissipation of the negative pressure pump.

[0015] Preferably, the throttle valve body is provided with two cavities, and the electronic control unit controls the opening of the two cavities. This solution facilitates the adjustment of the opening of each cavity of the throttle valve body.

[0016] In the second aspect, the utility model provides a universal twin-cylinder engine, including a crankcase and a first cylinder and a second cylinder arranged in a V shape, and also including a fuel supply device as in any of the above schemes, wherein the plug direction of the electronic control unit is arranged parallel to the crankshaft axis of the crankcase. Compared with the prior art, in this scheme, the installation position of the throttle valve body on the engine can be adjusted according to the installation positions of the components on the throttle valve body, so that the throttle valve body can adapt to engines of different specifications, thereby improving the compatibility of the throttle valve body with engines of various specifications, thereby reducing the cost of the mold, and also reducing the cost of the engine.

[0017] The utility model has the following beneficial effects:

[0018] 1. In the utility model, the installation position of the throttle valve body on the engine can be adjusted according to the installation positions of the components on the throttle valve body, so that the throttle valve body can adapt to engines of different specifications, thereby improving the compatibility of the throttle valve body with engines of various specifications, thereby reducing the cost of the mold and also reducing the cost of the engine.

[0019] 2. The installation positions of the various components in the utility model can be flexibly selected according to the actual installation process, and the arrangement is convenient for the arrangement of pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a partial structural schematic diagram of a universal twin-cylinder engine in an embodiment of a fuel supply device and a universal twin-cylinder engine of the utility model;

[0021] Figure 2 It is a partial schematic diagram of a fuel supply device;

[0022] Figure 3 It is a structural schematic diagram of the throttle valve part;

[0023] Figure 4 for Figure 3Left view of

[0024] Figure 5 for Figure 3 Right view of;

[0025] Figure 6 for Figure 3 A top view of

[0026] Figure 7 for Figure 3 Bottom view of

[0027] Figure 8 for Figure 3 Rear view of. DETAILED DESCRIPTION

[0028] The following is further described in detail through specific implementation methods:

[0029] 1. Definition

[0030] In the engine, the negative pressure pump mainly uses the negative pressure to transfer fuel from one container to another. Negative pressure refers to the pressure state lower than atmospheric pressure, also known as negative pressure.

[0031] Electronic Control Unit: refers to the integrated control device of the engine. Its function is to calculate, process, judge and output instructions based on the stored program of the engine to control the actions of the relevant actuators, so as to achieve the purpose of fast, accurate and automatic control of the engine operation.

[0032] Fuel injection unit: refers to the fuel injector, which is a precision device with very high processing accuracy. It requires a large dynamic flow range, strong anti-clogging and anti-pollution capabilities, and good atomization performance. The fuel injector receives the injection pulse signal sent by the ECU and accurately controls the amount of fuel injection.

[0033] 2. The reference numerals in the drawings of the specification include: first cylinder 1, manifold 2, fuel pump 3, negative pressure pump 4, mounting bracket 5, throttle valve body 6, mounting hole 60, throttle position sensor 61, stepper motor 62, intake pipe 7, electronic control unit 8, intake elbow 9, second cylinder 10, oil pipe 11, fuel injection unit 12.

[0034] The embodiment is basically as shown in the attached Figure 1 and Figure 2 As shown: a fuel supply device includes an intake pipe 7, a throttle valve body 6, a fuel injection unit 12, a fuel pump 3, a negative pressure pump 4 and an electronic control unit 8.

[0035] like Figure 3-Figure 8As shown, the throttle valve body 6 includes a throttle valve plate, a throttle position sensor 61 and a stepper motor 62. The throttle valve body 6 is provided with an air inlet. The electronic control unit 8 controls the movement of the throttle valve plate. Air enters the throttle valve body 6 from the intake pipe 7 and enters the fuel injection unit 12 after passing through the intake elbow 9 and the manifold 2. The electronic control unit 8 is connected to the throttle valve body 6, and mounting holes 60 for fixing the throttle valve body 6 are provided on both sides of the air inlet. The mounting holes 60 on one side are symmetrical with the mounting holes 60 on the other side along the center of the air inlet.

[0036] The throttle valve body 6 has a mounting surface A and a mounting surface B, and mounting surfaces A and B are both provided with mounting positions for the electronic control unit 8. In this embodiment, the upper end surface of the throttle valve body 6 is the mounting surface A, and the lower end surface is the mounting surface B, and the electronic control unit 8 is mounted on the mounting surface A.

[0037] The throttle valve body 6 has a mounting surface C and a mounting surface D, and the stepper motor 62 and the throttle position sensor 61 are mounted on the mounting surface C and the mounting surface D, respectively. In this embodiment, the left side of the throttle valve body 6 is the mounting surface C, and the right side is the mounting surface D. The throttle position sensor 61 is mounted on the mounting surface C, and the stepper motor 62 is mounted on the mounting surface D. Specifically, a mounting seat is provided on the mounting surface C, and the throttle position sensor 61 is connected to the mounting seat; a mounting bracket 5 is provided on the mounting surface D, and the stepper motor 62 is arranged on the mounting surface D through the mounting bracket 5.

[0038] The negative pressure pump 4 is located above the throttle valve body 6 and is arranged on the side of the intake pipe 7 close to the fuel pump 3. The negative pressure pump 4 is connected to the fuel pump 3, and the fuel pump is connected to the fuel injection unit 12 through the oil pipe 11. The negative pressure pump 4 is located on one side of the intake pipe 7 and is assembled on the intake pipe 7 through the mounting bracket 5. Specifically, the negative pressure pump 4 is assembled on the lower end surface of the mounting bracket 5, and the mounting bracket 5 is provided with a raised opening portion, and the opening portion is provided with a through hole. The negative pressure pump 4 is arranged to overlap with the through hole.

[0039] Air enters the throttle valve body 6 from the intake pipe 7 and enters the fuel injection unit 12 after passing through the intake elbow 9 and the manifold 2. The ECU unit controls the opening of the throttle valve body 6. Specifically, the throttle valve body 6 is provided with two left and right cavities, each of which is provided with a throttle valve sheet. The electronic control unit 8 controls the throttle valve sheets in the left and right cavities. The electronic control unit 8 drives a throttle shaft to adjust and rotate through a stepper motor, thereby driving the throttle valve to rotate to adjust the cavity opening. The two cavities of the throttle valve body 6 are respectively provided with an intake elbow 9 and a manifold 2.

[0040] This embodiment also discloses a universal twin-cylinder engine, comprising a crankcase, a first cylinder 1 and a second cylinder 10 arranged in a V shape, and the above-mentioned fuel supply device. The plug direction of the electronic control unit 8 is arranged parallel to the crankshaft axis of the crankcase.

[0041] The specific implementation process is as follows: When the universal two-cylinder engine in this embodiment is used, the universal two-cylinder engine is installed on the application terminal, and the negative pressure pump 4 is connected to the fuel tank. When in use, under the action of the negative pressure pump 4 and the fuel pump 3, the fuel enters the fuel injection unit 12 from the fuel tank through the negative pressure pump 4 and the fuel pump in sequence, and at the same time, the external air is mixed with the fuel sprayed by the fuel injection unit 12 through the intake pipe 7, the throttle valve body 6, the intake elbow 9 and the manifold 2, and then enters the corresponding cylinder.

[0042] The above is only an embodiment of the utility model. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, which will not affect the effect of the implementation of the utility model and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A fuel supply device, comprising an intake pipe, a throttle valve body, a fuel injection unit and an electronic control unit, wherein the throttle valve body comprises a throttle valve plate, a throttle position sensor and a stepper motor, the throttle valve body is provided with an air inlet, and the electronic control unit controls the movement of the throttle valve plate; characterized in that: The electronic control unit is connected to the throttle valve body, and mounting holes for fixing the throttle valve body are arranged on both sides of the air inlet, and the mounting holes on one side are symmetrical with the mounting holes on the other side along the center of the air inlet.

2. The fuel supply device according to claim 1, characterized in that: The throttle valve body has a mounting surface A and a mounting surface B, and both the mounting surface A and the mounting surface B are provided with mounting positions for the electronic control unit.

3. The fuel supply device according to claim 2, characterized in that: The throttle valve body has a mounting surface C and a mounting surface D, and the stepper motor and the throttle position sensor are mounted on the mounting surface C and the mounting surface D respectively.

4. The fuel supply device according to claim 3, characterized in that: A mounting bracket is provided on the mounting surface for mounting the stepper motor, and the stepper motor is arranged on the corresponding mounting surface through the mounting bracket.

5. The fuel supply device according to claim 4, characterized in that: A mounting seat is provided on the mounting surface on which the throttle position sensor is mounted, and the throttle position sensor is connected to the mounting seat.

6. The fuel supply device according to any one of claims 1 to 5, characterized in that: It also includes a fuel pump and a negative pressure pump, the negative pressure pump is connected to the fuel pump, and the negative pressure pump is located at one side of the intake pipe and is assembled on the intake pipe through a mounting bracket.

7. The fuel supply device according to claim 6, characterized in that: The negative pressure pump is arranged on a side of the intake pipe close to the fuel pump.

8. The fuel supply device according to claim 7, characterized in that: The negative pressure pump is located above the throttle valve body.

9. The fuel supply device according to claim 8, characterized in that: The negative pressure pump is mounted on the lower end surface of the mounting bracket.

10. The fuel supply device according to claim 9, characterized in that: The mounting bracket is provided with a raised opening portion, and the opening portion is provided with a through hole.

11. The fuel supply device according to claim 10, characterized in that: The throttle valve body is provided with two cavities, and the electronic control unit controls the opening of the two cavities.

12. A general two-cylinder engine, comprising a crankcase and a first cylinder and a second cylinder arranged in a V shape, characterized in that: It also includes the fuel supply device as described in any one of claims 1 to 11, wherein the plug direction of the electronic control unit is arranged parallel to the crankshaft axis of the crankcase.

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