Throttle valve body of motorcycle engine

Abstract

The utility model relates to the technical field of motorcycle engines, and discloses a throttle valve body of a motorcycle engine, which comprises a throttle valve main body, a throttle valve air flap, a throttle valve shaft and a torsion mechanism, an air inlet channel is arranged on the throttle valve main body, the throttle valve air flap is arranged in the air inlet channel and fixed on the throttle valve shaft, and the torsion mechanism is arranged on the throttle valve main body. The torsion mechanism is connected with a throttle valve shaft, and is characterized in that the air inlet channel comprises an air inlet side and an air outlet side, and the air inlet side is a convergent oval channel with a large inlet and a small outlet. The output power of the engine can be improved.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle engine technology, specifically to a throttle valve body for a motorcycle engine. Background Technology

[0002] In a motorcycle's electronic fuel injection system, the throttle body is a controllable valve that regulates the amount of air entering the engine. After entering the throttle body's throat, the air mixes with gasoline to form a combustible mixture, which then burns to produce power. Essentially, the motorcycle throttle body is an airflow controller. The throttle body controls the amount of fuel entering the cylinder for combustion (commonly known as the throttle). The larger the opening, the more fuel-air mixture enters the cylinder, resulting in a higher engine speed. Changing the throttle opening controls the engine speed.

[0003] Chinese patent document CN202402142U discloses a motorcycle electronic fuel injection throttle valve body, including a valve body body and a rotating mechanism. The valve body body has an air supply channel, and a throttle plate that cooperates with the air supply channel is provided in the air supply channel. A throttle shaft is provided in the middle of the throttle plate, and the throttle shaft extends out of the valve body body. One end of the throttle shaft that extends out of the valve body body is connected to the rotating mechanism. The throttle plate divides the air supply channel into an air connection chamber and an engine connection chamber. An oil and gas adsorption pipe is provided on the side wall of the air connection chamber, and an intake bypass channel is provided on the side wall of the valve body body.

[0004] Electronic fuel injection motorcycle engines generate power by burning fuel in the cylinder. Since the amount of fuel input is limited by the amount of air drawn into the cylinder, the power generated by the engine is also limited. If the engine is already operating at its best, the only way to increase the output power is to compress more air into the cylinder to increase the amount of fuel, thereby improving the engine's work capacity. The existing throttle body has a small intake volume, resulting in insufficient engine output power. Utility Model Content

[0005] To address the technical problem of improving engine output power, this utility model provides a throttle valve body for a motorcycle engine, comprising a throttle valve body, a throttle valve flap, a throttle valve shaft, and a torsion mechanism. The throttle valve body has an intake channel, the throttle valve flap is disposed within the intake channel and fixed on the throttle valve shaft, and the torsion mechanism is connected to the throttle valve shaft. The intake channel comprises an intake side and an outlet side, and the intake side is a converging elliptical channel with a large inlet and a small outlet.

[0006] Preferably, the cross-section of the air intake side is an ellipse with a long side of 36mm-44mm and a short side of 30mm-38mm, and the inlet to outlet of the air intake side is a smoothly transitioned channel.

[0007] To further accelerate the flow rate and increase the intake volume, the outlet side is a converging elliptical channel with a large inlet and a small outlet. The inlet of the outlet side and the outlet of the intake side have the same size. The long side and short side of the outlet side are both 1mm-2mm smaller than the long side and short side of the inlet. The inlet to outlet of the outlet side is a smooth transition channel.

[0008] In order to achieve precise control of fluid flow, the throttle valve damper is elliptical in shape to fit the air intake channel. The throttle valve shaft is provided with a strip-shaped mounting hole, through which the throttle valve damper passes and is fixed on the throttle valve shaft.

[0009] To facilitate control of the rotation of the throttle valve flap, the torsion mechanism includes a torsion spring, a bushing, and a guide wheel sequentially sleeved on one end of the throttle valve shaft. The torsion spring is sleeved on the outside of the bushing, one end of the torsion spring is connected to the guide wheel, and the other end is connected to the throttle valve body. The guide wheel is used to connect the throttle cable.

[0010] To prevent the guide wheel from falling off, a nut is connected to one end of the throttle valve shaft near the torsion mechanism.

[0011] Preferably, the throttle valve damper is located between the air inlet side and the air outlet side.

[0012] To reduce wear on the throttle valve shaft, support bearings are fitted at both ends of the throttle valve shaft.

[0013] To facilitate the installation and fixation of the throttle valve damper plate, mounting holes are provided on the throttle valve shaft and the throttle valve damper plate, and the throttle valve damper plate is fixed on the throttle valve shaft by bolts.

[0014] This utility model has the following beneficial effects:

[0015] This invention features a converging elliptical intake channel, which increases the airflow velocity within the intake channel. The cross-sectional area of ​​the intake channel gradually decreases from the intake side to the exhaust side, while the gas velocity entering the throttle body gradually increases from the intake side to the exhaust side. This increased gas velocity means more gas enters the cylinder within the same time frame, increasing the intake volume. In the same unit of time, more air-fuel mixture can be forced into the cylinder (combustion chamber) for compression and combustion (small-displacement engines can "inhale" the same amount of air as large-displacement engines, improving volumetric efficiency). With natural intake at the same engine speed, the engine delivers greater power output. When applied to motorcycles, engine performance is improved by 15% without increasing manufacturing costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of Embodiment 1 of the throttle valve body of the motorcycle engine of this utility model;

[0017] Figure 2 for Figure 1 Top view;

[0018] Figure 3 for Figure 2 AA section view;

[0019] Figure 4 for Figure 1 Exploded view. Detailed Implementation

[0020] The following detailed description illustrates the specific implementation method:

[0021] Converging elliptical channel: The cross-section is elliptical and gradually contracts or converges in a certain direction, with the cross-sectional area gradually decreasing. Gas flows under pressure in the converging channel.

[0022] The reference numerals in the accompanying drawings include: 1. Throttling valve body; 2. Throttling valve damper; 3. Throttling valve shaft; 4. Torsion mechanism; 5. Inlet passage; 501. Inlet side; 502. Outlet side; 6. Torsion spring; 7. Bushing; 8. Guide wheel; 9. Nut; 10. Support bearing; 11. Bolt; 12. Clip; 13. Bolt mounting hole; 14. Strip mounting hole.

[0023] Example 1

[0024] like Figure 1-4 As shown, a throttle valve body for a motorcycle engine includes a throttle valve body 1, a throttle valve flap 2, a throttle valve shaft 3, and a torsion mechanism 4. The throttle valve body 1 is provided with an intake channel 5. The throttle valve flap 2 is disposed in the intake channel 5 and fixed on the throttle valve shaft 3. The torsion mechanism 4 is connected to one end of the throttle valve shaft 3. The intake channel 5 includes an intake side 501 and an outlet side 502. The intake side 501 is a converging elliptical channel with a large inlet and a small outlet.

[0025] The inlet cross-section of the air intake side 501 is an ellipse with a long side of 44mm and a short side of 38mm, and the outlet cross-section of the air intake side 501 is an ellipse with a long side of 36mm and a short side of 30mm. The inlet and outlet of the air intake side 501 are smoothly transitioned.

[0026] The exhaust side 502 is a converging elliptical channel with a large inlet and a small outlet. The inlet of the exhaust side 502 has the same size as the outlet of the intake side 501. The long and short sides of the outlet of the exhaust side 502 are both 1 mm smaller than the long and short sides of the inlet. The inlet of the exhaust side 502 is an ellipse with a cross-section of 36 mm long and 30 mm short. The outlet of the exhaust side 502 is an ellipse with a cross-section of 35 mm long and 29 mm short. The passage from the inlet to the outlet of the exhaust side 502 is a smooth transition.

[0027] The throttle valve damper 2 is an elliptical shape adapted to the air intake channel 5, with dimensions of 36mm on the long side and 30mm on the short side. The throttle valve damper 2 can more accurately control the throttle cross section or throttle length, thereby achieving more precise adjustment of fluid flow.

[0028] In the figure, the short side of the throttle valve damper 2 and the outlet section of the intake side 501 is 30mm; in the figure, the short side of the inlet section of the intake side 501 is 38mm.

[0029] The torsion mechanism 4 includes a torsion spring 6, a bushing 7, and a guide wheel 8 sequentially sleeved on one end of the throttle valve shaft 3. The torsion spring 6 is sleeved on the outside of the bushing 7. One end of the torsion spring 6 is connected to the guide wheel 8, and the other end is connected to the throttle valve body 1. The guide wheel 8 is used to connect the throttle cable. The throttle opening and closing size drives the guide wheel 8 to rotate by a corresponding angle through the throttle cable, and the throttle valve shaft 3 and the throttle valve damper 2 rotate synchronously. The torsion spring 6 is used to restore the guide wheel 8 to its initial position, thereby driving the throttle valve shaft 3 and the throttle valve damper 2 to return to their initial positions.

[0030] A nut 9 is connected to one end of the throttle valve shaft 3 near the torsion mechanism 4. The nut 9 is used to tighten the guide wheel 8.

[0031] The throttle valve damper 2 is located between the air inlet side 501 and the air outlet side 502.

[0032] Both ends of the throttle valve shaft 3 are fitted with clips 12 and support bearings 10. The support bearings 10 are located between the throttle valve shaft 3 and the throttle valve body 1. The clips 12 limit the support bearings 10 to prevent them from moving laterally and falling off.

[0033] The throttle valve shaft 3 is provided with a strip-shaped mounting hole 14. The throttle valve damper plate 2 passes through the strip-shaped mounting hole 14 and passes through the throttle valve shaft 3. The throttle valve shaft 3 and the throttle valve damper plate 2 are provided with two bolt mounting holes 13. The throttle valve damper plate 2 is fixedly mounted on the throttle valve shaft 3 by bolts 11.

[0034] The throttle body of the motorcycle engine in this embodiment is installed on a single-cylinder engine and run, with the engine speed at 8500 rpm to test its output power.

[0035] Comparative Example 1

[0036] The difference between the throttle body of the motorcycle engine in Comparative Example 1 and the throttle body of the motorcycle engine in Example 1 is that the intake passage 5 adopts a converging circular passage, and the throttle valve flap 2 adopts a circular structure. The rest of the structure remains unchanged. The throttle body of the motorcycle engine in Comparative Example 1 is installed on a single-cylinder engine and run. The engine speed is 8500 rpm and its output power is tested.

[0037] Table 1

[0038] Structure type Output power Example 1 Converging elliptical channel 21.3kw Comparative Example 1 Converging circular channel 20.4kw

[0039] Example 1 uses a converging elliptical channel structure, compared to the converging circular channel used in Comparative Example 1. Power testing was performed on the throttle body of the motorcycle engine. According to Table 1, the output power of the throttle body using the converging elliptical channel is greater than that using the converging circular channel. It is very difficult to increase the power by more than 0.5 kW at the same speed, but this application increases it by 0.9 kW, which also indirectly proves that this application improves the air intake volume.

[0040] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A throttle valve body for a motorcycle engine, comprising a throttle valve body, a throttle valve flap, a throttle valve shaft, and a torsion mechanism, wherein the throttle valve body has an intake passage, the throttle valve flap is disposed within the intake passage and fixed to the throttle valve shaft, and the torsion mechanism is connected to the throttle valve shaft, characterized in that, The air intake channel includes an air intake side and an air outlet side. The air intake side is a converging elliptical channel with a large inlet and a small outlet. The air outlet side is also a converging elliptical channel with a large inlet and a small outlet. The inlet and outlet dimensions of the air outlet side are the same, and the long and short sides of the outlet side are 1mm-2mm smaller than the long and short sides of the inlet side.

2. The throttle valve body of the motorcycle engine according to claim 1, characterized in that: The cross-section of the air intake side is an ellipse with a long side of 36mm-44mm and a short side of 30mm-38mm.

3. The throttle valve body of the motorcycle engine according to claim 2, characterized in that: The throttle valve damper plate is elliptical in shape to fit the air intake channel. The throttle valve shaft is provided with a strip-shaped mounting hole. The throttle valve damper plate passes through the strip-shaped mounting hole and is fixed on the throttle valve shaft.

4. The throttle valve body of the motorcycle engine according to any one of claims 1-3, characterized in that: The torsion mechanism includes a torsion spring, a bushing, and a guide wheel sequentially sleeved on one end of the throttle valve shaft. The torsion spring is sleeved on the outside of the bushing. One end of the torsion spring is connected to the guide wheel, and the other end is connected to the throttle valve body. The guide wheel is used to connect the throttle cable.

5. The throttle valve body of the motorcycle engine according to claim 4, characterized in that: A nut is connected to one end of the throttle valve shaft near the torsion mechanism.

6. The throttle valve body of the motorcycle engine according to claim 5, characterized in that: The throttle valve damper is located between the air inlet side and the air outlet side.

7. The throttle valve body of the motorcycle engine according to claim 6, characterized in that: Both ends of the throttle valve shaft are fitted with support bearings.

8. The throttle valve body of the motorcycle engine according to claim 7, characterized in that: The throttle valve shaft and the throttle valve damper are provided with mounting holes, and the throttle valve damper is fixed to the throttle valve shaft by bolts.

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