CN201003442Y - Negative pressure regulating type air inlet structure of scooter locomotive engine - Google Patents

Abstract

A negative pressure adjustable air inlet structure of a scooter locomotive engine is characterized by comprising: the cylinder head comprises a combustion chamber, an air inlet channel and an air outlet channel, wherein the air inlet channel and the air outlet channel are respectively communicated with the combustion chamber; the air inlet pipeline is communicated between an air inlet channel of the locomotive engine and the air filter, and the cross section of the air inlet pipeline is provided with an air inlet sectional area; the vacuum source comprises a negative pressure pipeline and a check valve assembled on the negative pressure pipeline, and the first end of the negative pressure pipeline is communicated with the air inlet pipeline; the negative pressure adjusting type air inlet structure comprises a bypass negative pressure pipeline, a negative pressure actuator and a control valve plate, wherein the control valve plate is contained in the air inlet pipeline, the first end of the bypass negative pressure pipeline is communicated to the second end of the negative pressure pipeline of the vacuum source, and the second end of the bypass negative pressure pipeline is communicated to the negative pressure actuator. The utility model discloses can stabilize the actuation of the control valve block of negative pressure adjustment formula inlet structure relatively to promote the stability and ride the riding quality of scooter locomotive consequently.

Description

Negative Pressure Adjustable Air Intake Structure of Suikeda Locomotive Engine

technical field

The utility model relates to a negative pressure adjustable air intake structure, in particular to a negative pressure adjustable air intake structure suitable for scooter locomotive engines.

Background technique

In the engine design of a general scooter locomotive, the design of the intake pipeline and the cooperation between the engine are extremely important. For example, when the engine is at a slow or low speed, the required cross-sectional area of the intake pipeline is relatively small Small, long length, which can help to increase the gas flow rate in the intake pipe, and thus enhance the inertial effect and pulsation effect, thereby improving the intake efficiency and increasing the engine torque; on the contrary, when the engine is fast or high speed, its The required intake pipeline has a larger cross-sectional area and a shorter length, which can reduce flow resistance, which is conducive to the improvement of intake efficiency, thereby improving the combustion process and increasing horsepower.

For the above requirements, please refer to the schematic diagram of the conventional negative pressure adjustable intake structure shown in FIG. The valve plate 93 is such that the valve plate 93 can be controlled to open or cover the intake pipeline 92, so as to change the cross-sectional area of the intake pipeline 92, so that the flow rate of external air entering the intake pipeline 92 can be changed.

Therefore, when the engine 91 is lower than a preset speed, the electronic control unit 94 (ECU) can be used to control the solenoid valve 95 to actuate (open or shield the negative pressure pipeline 96), so that the negative pressure actuator 97 can control the control valve plate 93 reduces the cross-sectional area of the intake line 92 and thus increases the gas flow rate in the intake line 92 . Conversely, when the engine 91 is higher than a preset speed, the electronic control unit 94 can be used to control the solenoid valve 95 to act (covering or opening the negative pressure pipeline 96, which is opposite to the aforementioned action), so that the negative pressure actuator 97 can control The control valve plate 93 increases the cross-sectional area of the intake pipeline 92, thereby reducing flow resistance and improving intake efficiency.

However, please also refer to the schematic diagram of the pressure change of the conventional negative pressure adjustment type intake structure shown in FIG. 1 and FIG. Positive pressure and negative pressure, in this way, will cause positive and negative pressure mixed flow in the negative pressure pipeline 96, that is to say, there will be air flow pulsation in the negative pressure pipeline 96, so it will affect the actuation of the control valve plate 93 The control makes the control valve plate 93 actuate discontinuously, and then leads to poor rideability, which is not very ideal.

Utility model content

The purpose of this utility model is to provide a negative pressure engine of a scooter that can prevent the pulsation of air flow in the negative pressure pipeline and can relatively stabilize the actuation of the control valve plate of the negative pressure adjustment type air intake structure. Pressure adjustable intake structure.

The utility model basically adopts the features described in detail below in order to solve the above-mentioned problems. That is to say, the purpose of the utility model is achieved in that the negative pressure adjustable air intake structure of the scooter engine includes a scooter engine, an air filter, an intake pipeline, a vacuum source, And a negative pressure adjustable intake structure.

Wherein, the scooter locomotive engine includes a cylinder head, and the aforementioned cylinder head includes a combustion chamber, an intake port, and an exhaust port, wherein the intake port and the exhaust port are respectively connected to the combustion chamber.

In addition, the intake pipeline is connected between the air intake of the scooter engine and the air filter, and the cross section of the intake pipeline has an intake sectional area. As for the vacuum source, it includes a negative pressure pipeline and a check valve, wherein the check valve group is arranged on the negative pressure pipeline, and a first end of the negative pressure pipeline is connected to the intake pipeline.

In addition, the negative pressure adjustable intake structure includes a bypass negative pressure pipeline, a negative pressure actuator, and a control valve plate, wherein the control valve plate is accommodated inside the intake pipeline, and the bypass negative pressure pipeline A first end is connected to a second end of the negative pressure pipeline of the vacuum source, and a second end of the bypass negative pressure pipeline is connected to the negative pressure actuator.

The above-mentioned check valve may include a channel and a vacuum diaphragm, and the vacuum diaphragm may cover the channel.

In addition, the bypass negative pressure pipeline of the negative pressure adjustable air intake structure can also include a solenoid valve, and the solenoid valve can control and close the bypass when the engine speed of the scooter locomotive is lower than a preset low speed The negative pressure pipeline is controlled to bypass the negative pressure pipeline when the engine speed of the scooter is higher than a preset high speed.

The utility model has the advantage that when the engine speed of the scooter is higher, the negative pressure value in the vacuum source is lowered, and then the negative pressure actuator is driven through the negative pressure in the bypass negative pressure pipeline, so as to drive Control the opening of the valve plate to obtain a larger intake cross-sectional area of the intake pipe, which can reduce the flow resistance, which is conducive to the improvement of the intake efficiency, thereby improving the combustion process and increasing the horsepower.

Conversely, when the engine speed of the scooter is lower, the negative pressure actuator will drive the control valve to close to obtain a smaller intake cross-sectional area of the intake pipeline, which will help increase the gas flow rate in the intake pipeline. And thus enhance the inertial effect and pulsation effect, thereby improving the air intake efficiency and increasing the engine torque of the scooter locomotive.

In addition, the design of the check valve mentioned above can filter the positive pressure and negative pressure generated by the scooter engine during operation, so that the negative pressure-adjustable air intake structure can maintain a state of only negative pressure, and also That is to say, there will be no pulsation of air flow in the negative pressure pipeline, and relatively stable control of the movement of the valve plate, thereby improving the stability and rideability of the scooter motorcycle.

Description of drawings

Fig. 1 is a schematic diagram of a conventional negative pressure adjustable intake structure.

FIG. 2 is a schematic diagram of pressure changes in a conventional negative pressure adjustable intake structure.

Fig. 3 is a schematic diagram of a preferred embodiment of the present invention.

Fig. 4 is a cross-sectional view of a small air intake pipeline in a preferred embodiment of the present invention.

Fig. 5 is a schematic diagram of pressure changes in a preferred embodiment of the present invention.

Explanation of icon symbols

Scooter locomotive engine 1 cylinder head 11

Combustion chamber 111 Intake channel 112

Exhaust duct 113

air filter 2

Intake pipeline 3 Small intake pipeline 31

Small air intake line 32

Vacuum source 4 Negative pressure pipeline 41

First end 411 Second end 412

Regulator box 42 Check valve 43

Channel 431 Vacuum diaphragm 432

Negative pressure adjustable intake structure 5 Bypass negative pressure pipeline 51

First end 511 Second end 512

Negative pressure actuator 52 Reed 521

Connecting rod 522 Coil spring 523

Control valve section 53 Solenoid valve 54

Electronic Control Unit 6

Engine 91 Intake pipeline 92

Control valve plate 93 Electronic control unit 94

Solenoid valve 95 Negative pressure pipeline 96

Negative pressure actuator 97

Detailed ways

Please also refer to the schematic diagram of a preferred embodiment of the utility model shown in FIG. 3 and the cross-sectional view of a small air intake pipeline of a preferred embodiment of the utility model shown in FIG. A negative pressure adjustable air intake structure for a locomotive engine, and it includes a scooter locomotive engine 1, an air filter 2, an intake pipeline 3, a vacuum source 4, and a negative pressure adjustable air intake structure 5.

The scooter locomotive engine 1 in the drawing includes a cylinder head 11, and this cylinder head 11 includes a combustion chamber 111, an intake passage 112, and an exhaust passage 113, wherein the intake passage 112 and the exhaust passage 113 are connected to the combustion chamber 111 respectively.

In addition, the air intake pipeline 3 communicates between the air intake duct 112 of the scooter engine 1 and the air filter 2 , and the cross section of the air intake pipeline 3 has an air intake sectional area. In this embodiment, the aforementioned air intake pipeline 3 is composed of two parallel small air intake pipelines 31 , 32 .

In addition, the vacuum source 4 includes a negative pressure pipeline 41 and a check valve 43, wherein the check valve 43 is assembled on the negative pressure pipeline 41, and a first end 411 of the negative pressure pipeline 41 is connected to To the intake pipe 3 and adjacent to the side of the intake port 112 of the cylinder head 11 .

The check valve 43 includes a channel 431 and a vacuum membrane 432 , and the vacuum membrane 432 is covered on the channel 431 .

The negative pressure adjustable intake structure 5 in the figure includes a bypass negative pressure pipeline 51, a negative pressure actuator 52, and a control valve plate 53, wherein the control valve plate 53 is accommodated in a normally closed state. Inside one of the small intake pipelines 32 of the intake pipeline 3, a first end 511 of the bypass negative pressure pipeline 51 is connected to a second end 412 of the negative pressure pipeline 41 of the vacuum source 4, and the bypass negative pressure A second end 512 of the pipeline 51 is connected to the negative pressure actuator 52 , and the bypass negative pressure pipeline 51 further includes a solenoid valve 54 .

In this embodiment, the negative pressure actuator 52 includes a reed 521, a connecting rod 522, and a coil spring 523, and one side of the reed 521 is fixed with the aforementioned connecting rod 522, and the other side is assembled with The aforementioned coil spring 523 .

In addition, in this embodiment, the vacuum source 4 includes a surge tank 42, and the second end 412 of the negative pressure pipeline 41 is connected to the surge tank 42, and the first end 511 of the bypass negative pressure pipeline 51 is connected to To the surge tank 42.

When actuating, when the speed of the engine 1 of the scooter locomotive is higher (when it is higher than a preset high speed), the negative pressure value in the vacuum source 4 will be lower. At this time, an electronic control unit 6 can control the solenoid valve. 54 conducts the bypass negative pressure pipeline 51, and then drives the negative pressure actuator 52 through the negative pressure in the bypass negative pressure pipeline 51, so as to drive the control valve plate 53 to open so that the intake pipeline 3 has a larger Intake cross-sectional area.

Conversely, when the engine 1 speed of the scooter is lower (below a preset low speed), the negative pressure value in the vacuum source 4 will be higher. At this time, the electronic control unit 6 can control the solenoid valve 54 to shield the bypass The negative pressure pipeline 51 further makes the negative pressure actuator 52 use elastic force to drive the control valve plate 53 to cover so that the intake pipeline 3 has a smaller intake cross-sectional area.

Therefore, when the speed of the scooter engine 1 is higher, the control valve plate 53 can be opened to obtain a larger intake cross-sectional area of the intake pipe 3, which can reduce the flow resistance, thereby helping to improve the intake efficiency. This in turn improves the combustion process and increases horsepower. Conversely, when the speed of the scooter engine 1 is lower, the control valve plate 53 can be closed to obtain a smaller air intake cross-sectional area of the intake pipeline 3, which can help improve the gas flow rate in the intake pipeline, and therefore Enhance the inertial effect and pulsation effect, thereby improving the intake efficiency and increasing the torque of the scooter engine 1.

In addition, please refer to Fig. 3, Fig. 4, and Fig. 5 showing the schematic diagram of the pressure change of a preferred embodiment of the present invention. The design of the check valve 43 can filter the engine 1 of the scooter during operation. The positive pressure and negative pressure generated in the negative pressure pipeline 41 can keep the negative pressure-adjusted air intake structure in a negative pressure state, so that there will be no pulsation of air flow in the negative pressure pipeline 41, relatively The actuation of the valve plate 53 can be stably controlled, thereby improving the stability and rideability of the scooter motorcycle.

In addition, in this embodiment, the above-mentioned control valve plate 53 is accommodated inside one of the small air intake pipelines 32 of the intake pipeline 3 in a normally closed state, but the opposite design is also possible, that is, the control valve plate 53 can be normally open The state is accommodated inside one of the small air intake pipes 32 of the air intake pipe 3, and the opening or closing action of the solenoid valve 54 only needs to be reversed.

Claims (9)

1. A negative pressure adjustable air intake structure of a scooter locomotive engine, characterized in that it comprises: A scooter locomotive engine, including a cylinder head, and the cylinder head includes a combustion chamber, an intake port, and an exhaust port, wherein the intake port and the exhaust port are respectively connected to the combustion chamber; an air filter; An air intake pipeline is connected between the air intake duct of the scooter engine and the air filter, and the cross section of the air intake pipeline has an air intake cross-sectional area; A vacuum source, including a negative pressure pipeline, and a check valve, wherein the check valve group is arranged on the negative pressure pipeline, and a first end of the negative pressure pipeline is connected to the intake pipeline; and A negative pressure adjustable intake structure, including a bypass negative pressure pipeline, a negative pressure actuator, and a control valve plate, wherein the control valve plate is accommodated inside the intake pipeline, and the bypass negative pressure A first end of the pipeline communicates with a second end of the negative pressure pipeline of the vacuum source, and a second end of the bypass negative pressure pipeline communicates with the negative pressure actuator. 2. The negative pressure adjustable air intake structure of the scooter locomotive engine according to claim 1, wherein the check valve includes a passage and a vacuum diaphragm, and the vacuum diaphragm covers the passage . 3. The negative pressure adjustable air intake structure of the scooter engine according to claim 1, characterized in that the bypass negative pressure pipeline further includes a solenoid valve. 4 . The negative pressure adjustable air intake structure for scooter motorcycle engine according to claim 1 , wherein the negative pressure actuator includes a reed, a connecting rod, and a coil spring. 5 . The negative pressure adjustable air intake structure for scooter motorcycle engine according to claim 4 , wherein the connecting rod is fixed on one side of the reed, and the coil spring is assembled on the other side. 6 . 6. The negative pressure adjustable air intake structure of the Scooter locomotive engine according to claim 1, characterized in that the first end of the negative pressure pipeline of the vacuum source is connected to the air intake pipeline and adjacent to One side of the intake port of the cylinder head. 7. The negative pressure adjustable air intake structure of the scooter locomotive engine according to claim 1, wherein the vacuum source includes a pressure stabilizing tank, and the second end of the negative pressure pipeline is connected to the stabilizing tank. The pressure tank, the first end of the bypass negative pressure line is connected to the pressure stabilization tank. 8. The negative pressure adjustable air intake structure of the Scooter locomotive engine according to claim 1, characterized in that the air intake pipeline is composed of two parallel small air intake pipelines, and the control valve plate is accommodated in One of the small intake pipes. 9 . The negative pressure adjustable air intake structure of the scooter engine according to claim 8 , wherein the control valve plate is accommodated in one of the small air intake pipelines in a normally closed state. 10 .

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