A motorcycle electronic fuel injection throttle structure

Abstract

This utility model discloses a motorcycle electronic fuel injection throttle structure, including a throttle body, a throttle valve plate, and a return assembly. An idle speed adjustment assembly is located on one side of the throttle body. The throttle valve plate is rotatably connected to the throttle body via a throttle valve shaft. The return assembly is located on one side of the throttle body and includes a return torsion spring and an auxiliary torsion spring. One end of the return torsion spring is sleeved on the throttle valve shaft. Through the linkage design of the return torsion spring and the auxiliary torsion spring, at a small throttle opening, the two torsion springs together provide sufficient elasticity, reducing idle speed vibration and improving idle speed stability. At a large throttle opening, the auxiliary torsion spring shares part of the elasticity of the return torsion spring, reducing the output torque required for the motor to overcome the spring force. This reduces motor energy consumption, allowing for more timely and smooth power output from the engine at high speeds. Furthermore, the load is distributed between the two torsion springs, resulting in lower stress on each individual torsion spring, lower risk of fatigue fracture, and longer lifespan.

Description

Technical Field

[0001] This utility model belongs to the field of electronic fuel injection throttle technology, specifically relating to a motorcycle electronic fuel injection throttle structure. Background Technology

[0002] Electronic fuel injection motorcycles are a new type of motorcycle. Their engines use an air intake flow regulating device to control the engine's fuel supply process. The throttle valve is the device that provides combustion air to the electronic fuel injection engine. It is usually equipped with an opening sensor that transmits the opening value and opening speed to the controller. This controller can be set up separately or directly connected to the ECU. The controller determines the real-time operating status of the vehicle.

[0003] Currently, the main drive components for the electronic fuel injection throttle valve of motorcycles are "single torsion spring + motor" drive structures. Among them, the single torsion spring drive structure has become the mainstream solution for small and medium displacement motorcycles due to its low cost and high mechanical reset reliability. Its principle is that the torsion spring provides the throttle valve reset force, and the motor drives the throttle valve to open and close by overcoming the spring force through the reduction mechanism. When the motor loses power or malfunctions, the spring can drive the throttle valve back to the idle speed opening, avoiding the risk of engine stalling or overspeeding.

[0004] However, in the single torsion spring drive structure, the spring force is linearly positively correlated with the throttle opening during use. This results in the spring force being too small when the throttle is open (idle speed adjustment range), causing fluctuations in the motor drive force and easily leading to idle speed vibration. When the throttle is open at a large degree (high-speed power range), the spring force is too large, requiring the motor to output more torque, which not only increases energy consumption but also easily leads to throttle response delay due to excessive motor load. Utility Model Content

[0005] The purpose of this invention is to provide a motorcycle electronic fuel injection throttle valve structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a motorcycle electronic fuel injection throttle structure, including a throttle body, wherein an idle speed adjustment component is provided on one side of the throttle body for regulating the intake air volume of the idle speed bypass channel provided in the throttle body, thereby achieving stable control of the engine idle speed.

[0007] A throttle valve disc is rotatably connected to the throttle body via a throttle valve shaft. The rotation of the throttle valve shaft causes the throttle valve disc to flip, controlling the cross-sectional area of ​​the intake passage within the throttle body to adjust the intake volume. A return assembly is located on one side of the throttle body and is used to automatically return the throttle valve disc to the idle position. The return assembly includes a return torsion spring and an auxiliary torsion spring. One end of the return torsion spring is sleeved on the throttle valve shaft. The auxiliary torsion spring and the return torsion spring are connected by a connector. The auxiliary torsion spring is linked to the return torsion spring via the connector, so that the auxiliary torsion spring drives the return torsion spring through the connector, thus coordinating to complete the automatic return action of the throttle valve disc.

[0008] Preferably, the connecting member includes a sector plate, which is fixedly sleeved on one end of the throttle valve shaft. One end of the return torsion spring is connected to the sector plate, and the other end abuts against a protrusion on the surface of the throttle body. This provision achieves the transmission connection between the return torsion spring and the throttle valve shaft by fixing the sector plate to one end of the throttle valve shaft and connecting the return torsion spring to the protrusion of the throttle body, thus providing structural support for the return torsion spring to transmit the reset force to the throttle valve shaft.

[0009] Preferably, a sliding shaft is connected to one side of the throttle body, a sector-shaped disc is rotatably sleeved on the sliding shaft, and a sector-shaped rocker arm is rotatably connected to the sector-shaped disc via a pin. The other end of the sector-shaped rocker arm is rotatably connected to the sector-shaped plate via a pin. This provision, through the rotatable connection structure of the sliding shaft, sector-shaped disc and sector-shaped rocker arm, realizes the function of converting the force of the throttle cable or motor into the rotational force of the throttle valve shaft, thereby driving the throttle valve plate to move.

[0010] Preferably, the auxiliary torsion spring is sleeved on the sector-shaped disk, with one end connected to the sector-shaped disk and the other end abutting against the protrusion on the surface of the throttle body. This provision allows the auxiliary torsion spring to deform with the movement of the sector-shaped disk by sleeved on and connected to the protrusion on the throttle body, thereby linking with the return torsion spring to provide elastic force for the throttle valve plate to return to its original position.

[0011] Preferably, the throttle body has two sets of intake pipes on one side, and one end of the intake pipes is connected to the intake passage. This provision achieves the function of supplementing the intake passage with air by setting two sets of intake pipes connected to the intake passage on one side of the throttle body, thus meeting the intake requirements of the engine under different operating conditions.

[0012] Preferably, the idle speed adjustment component includes a stepper motor, which is mounted on the throttle body via a mounting bracket and the output shaft of the stepper motor is connected to a lead screw. This component fixes the stepper motor on the throttle body via the mounting bracket and connects its output shaft to the lead screw, providing a power source for adjusting the intake air volume of the idle bypass channel and transmitting power through the lead screw.

[0013] Preferably, a sealing block is connected to the lead screw via a lead screw nut. The sealing block seals the idle bypass passage. This component moves the sealing block through the transmission connection between the lead screw and the lead screw nut. By changing the degree of sealing of the idle bypass passage by the sealing block, the intake air volume of the idle bypass passage can be precisely adjusted.

[0014] Preferably, a slot is provided inside the throttle valve shaft, and the throttle valve plate is inserted into the slot and fixed to the throttle valve shaft by screws. This method of fixing by slotting the throttle valve shaft and screwing it increases the contact area between the throttle valve plate and the throttle valve shaft, prevents the valve plate from loosening, and ensures the accuracy of intake air volume control.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] (1) By linking the return torsion spring and the auxiliary torsion spring, the problem of "insufficient spring force at small opening and excessive spring force at large opening" of the single torsion spring is effectively solved. At the small opening of the throttle (idle speed range), the double torsion springs of the return torsion spring and the auxiliary torsion spring provide sufficient spring force, which can offset the small fluctuations of the motor driving force, reduce idle speed vibration, and improve idle speed stability. At the large opening of the throttle (high speed range), the auxiliary torsion spring shares part of the spring force of the return torsion spring, reducing the output torque required for the motor to overcome the spring force. This reduces the energy consumption of the motor and avoids the throttle response delay caused by excessive motor load, making the power output of the engine more timely and smooth under high speed conditions. Moreover, the load is distributed to the two torsion springs, the stress of a single torsion spring is lower, the risk of fatigue fracture is small, and the service life is longer.

[0017] (2) The stepper motor driven sealing block type idle speed adjustment structure realizes the control of the intake volume of the idle bypass channel. The stepper motor can drive the sealing block to move smoothly. By changing the degree of blockage of the channel by the sealing block, it can flexibly adapt to the intake demand of different idle speed conditions of the engine (such as cold start and hot engine idle speed), effectively suppress the large fluctuation of idle speed, avoid engine shaking and stalling caused by unstable idle speed, and improve the reliability of engine idle speed operation.

[0018] (3) The throttle valve plate and the throttle valve shaft adopt the connection method of "slotted insertion + screw fixing". Compared with the traditional single-point fixing, the contact area between the valve plate and the valve shaft is increased, which avoids the intake volume control deviation caused by the loosening of the valve plate during long-term use. Attached Figure Description

[0019] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0020] Figure 2 This is a structural schematic diagram of the present invention from a second perspective;

[0021] Figure 3This is a structural schematic diagram of the present invention from a third-view perspective;

[0022] Figure 4 This is a bottom view of the present invention;

[0023] Figure 5 This is a schematic diagram of the stepper motor of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the throttle valve plate and throttle valve shaft of this utility model.

[0025] In the diagram: 1. Throttle body; 2. Idle bypass passage; 3. Throttle valve plate; 4. Throttle valve shaft; 5. Intake passage; 6. Return torsion spring; 7. Auxiliary torsion spring; 8. Sector plate; 9. Sector disc; 10. Sector rocker arm; 11. Intake pipe; 12. Stepper motor; 13. Lead screw; 14. Sealing block; 15. Mounting base; 16. Groove. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved with", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] This utility model provides, for example Figure 1-6 The illustrated motorcycle electronic fuel injection throttle valve structure includes:

[0029] Throttle body 1, which serves as the mounting base for the entire throttle structure, has an idle speed adjustment component on one side. The idle speed adjustment component is used to precisely control the intake flow area of ​​the idle bypass channel 2 provided in the throttle body 1. By changing the bypass intake volume, it adapts to different idle speed conditions such as cold start and hot idle, thereby achieving stable control of the engine idle speed and avoiding idle speed vibration, stalling, or abnormal speed fluctuations.

[0030] Throttle valve 3 is rotatably connected to the intake passage 5 of the throttle body 1 via throttle valve shaft 4. The rotation of throttle valve shaft 4 around its own axis drives throttle valve 3 to rotate radially along the intake passage 5, changing the effective flow gap between throttle valve 3 and the inner wall of intake passage 5, thereby precisely adjusting the amount of air intake in intake passage 5 to adapt to the different power output requirements of the engine from low-speed cruising to high-speed acceleration.

[0031] The return assembly, located on one side of the throttle body 1, is used to automatically return the throttle valve plate 3 to a preset idle position when the throttle driving force disappears or the motor fails, thus avoiding the risk of engine stalling or overspeeding. The return assembly includes a return torsion spring 6 and an auxiliary torsion spring 7. One end of the return torsion spring 6 is sleeved on the throttle valve shaft 4 to provide basic reset spring force for the throttle valve plate 3. The auxiliary torsion spring 7 and the return torsion spring 6 are connected by a connector to form a synchronous linkage. During the return process of the throttle valve plate 3, the auxiliary torsion spring 7 can transmit auxiliary reset force to the return torsion spring 6 through the connector, so that the two work together to output reset spring force. This solves the problem of "insufficient spring force at small opening and excessive spring force at large opening" of a single torsion spring, and also distributes the load to reduce the stress of a single torsion spring, reduce the risk of fatigue fracture, and extend the service life of the assembly.

[0032] The connecting component includes a sector plate 8, which serves as a force transmission intermediary between the return torsion spring 6 and the throttle valve shaft 4. It is rigidly connected to one end of the throttle valve shaft 4 through a fixed sleeve connection, ensuring that the sector plate 8 can rotate synchronously when the throttle valve shaft 4 rotates, thereby causing the return torsion spring 6 to deform and store the reset potential energy. One end of the return torsion spring 6 is fixedly connected to the sector plate 8, and the other end abuts against a pre-set protrusion on the surface of the throttle body 1. This protrusion provides a stable elastic support base for the return torsion spring 6, ensuring that the deformation direction of the return torsion spring 6 is consistent with the elastic output direction, and avoiding return jamming or reset position deviation caused by elastic force offset.

[0033] A sliding shaft is fixedly connected to one side of the throttle body 1. The sliding shaft provides a rotatable mounting support for the sector disc 9, allowing the sector disc 9 to rotate stably around the axis of the sliding shaft. The sector disc 9 serves as a receiving component for external driving force, and a sector rocker arm 10 is rotatably connected to it via a pin. One end of the sector rocker arm 10 is rotatably connected to the sector plate 8 via a pin. This structure can convert external driving force (such as the linear tension of the throttle cable or the rotational torque of the motor) into the swinging power of the sector rocker arm 10, which is then transmitted to the sector plate 8 through the sector rocker arm 10, ultimately driving the throttle valve shaft 4 to rotate, thereby realizing the opening and closing adjustment of the throttle valve plate 3. The rotating connection structure can reduce frictional losses during power transmission, ensuring sensitive throttle response.

[0034] The auxiliary torsion spring 7 is sleeved on the sector disk 9, so that when the sector disk 9 rotates, it can synchronously drive the auxiliary torsion spring 7 to deform and store auxiliary reset potential energy. One end of the auxiliary torsion spring 7 is fixedly connected to the sector disk 9 to ensure that its deformation changes synchronously with the rotation of the sector disk 9, and the other end abuts against the pre-set protrusion on the surface of the throttle body 1. The protrusion provides a stable elastic support point for the auxiliary torsion spring 7. When the throttle valve plate 3 needs to return to its original position, the reset elastic force released by the auxiliary torsion spring 7 drives the sector disk 9 to rotate in the opposite direction, and then transmits it to the sector plate 8 and the throttle valve shaft 4 through the sector rocker arm 10. It works with the return torsion spring 6 to output reset force. When the throttle is fully open, it can share the elastic load of the return torsion spring 6, reduce the motor drive torque requirement, and reduce energy consumption and response delay.

[0035] The throttle body 1 has two sets of intake pipes 11 on one side. The two sets of intake pipes 11 are symmetrically or staggeredly distributed. One end of each pipe is connected to the inside of the intake passage 5, and the other end can be connected to the engine intake manifold. This dual intake pipe structure can increase the total intake flow of the intake passage 5, ensure sufficient air supply under high engine load conditions, and make the airflow more evenly distributed in the intake manifold, reduce the impact of intake turbulence on intake stability, and improve engine combustion efficiency and power output smoothness.

[0036] The idle speed adjustment component includes a stepper motor 12, which is fixedly mounted on the throttle body 1 via a mounting base 15. The mounting base 15 provides a stable position for the stepper motor 12, preventing positional displacement caused by vibration during motor operation. As a precision drive component, the stepper motor 12 can achieve step-by-step rotation at a fixed angle according to the control commands sent by the engine ECU electronic control unit. Its output shaft is coaxially fixedly connected to the lead screw 13, which can accurately transmit its rotational motion to the lead screw 13, providing an automated and precise power source for the intake air volume adjustment of the idle speed bypass channel 2.

[0037] The lead screw 13 is connected to the lead screw nut via a helical transmission, and the lead screw nut is fixedly connected to the sealing block 14. When the lead screw 13 rotates under the drive of the stepper motor 12, the lead screw nut can convert the rotational motion of the lead screw 13 into linear motion along the axis of the lead screw 13, thereby driving the sealing block 14 to move linearly in sync. The sealing block 14 adopts a structural design adapted to the shape of the inlet of the idle bypass channel 2. By changing its own linear movement, it changes the blocking area of ​​the idle bypass channel 2—when the blocking area increases, the air intake decreases, and when the blocking area decreases, the air intake increases, thereby achieving precise control of the air intake of the idle bypass channel 2 and ensuring stable engine idling speed.

[0038] The throttle valve shaft 4 has a radially formed slot 16, which provides an insertion mounting and positioning slot for the throttle valve plate 3, allowing the throttle valve plate 3 to be accurately embedded in the throttle valve shaft 4 and increasing the contact area between the two. After the throttle valve plate 3 is inserted into the slot 16, it is fixed to the throttle valve shaft 4 by screws. This fixing method can tightly connect the throttle valve plate 3 and the throttle valve shaft 4 into one unit, ensuring that when the throttle valve shaft 4 rotates, it drives the throttle valve plate 3 to rotate synchronously without relative displacement, avoiding intake volume control deviation caused by valve plate loosening, and extending the service life of the throttle valve.

[0039] The motorcycle's electronic fuel injection throttle structure uses a sector-shaped disc 9 as the power receiver, connected to the throttle cable. When power from the throttle cable is transmitted through the sector-shaped disc 9 to the sector-shaped rocker arm 10, the sector-shaped disc 9 and the sector-shaped rocker arm 10 are connected by a pin. Lubricant is applied to the pin to reduce frictional resistance during relative rotation. The sector-shaped disc 9 then transmits power to the sector-shaped plate 8 through the sector-shaped rocker arm 10. The sector-shaped plate 8 is fixed to the throttle valve shaft 4 using a key connection. When intake adjustment is needed, the sector-shaped disc 9 connected to the throttle cable will be subjected to force and move, causing the sector-shaped rocker arm 10 to rotate. Arm 10 is rotatably connected to sector disc 9 and sector plate 8 via a pin. Sector disc 9 can transmit the linear tension of the pull cable to sector plate 8 fixed on throttle valve shaft 4 through sector rocker arm 10. Sector plate 8 drives throttle valve shaft 4 to rotate, thereby causing throttle valve plate 3 to flip in intake passage 5 of throttle body 1. By changing the relative position of valve plate and intake passage 5 wall, the effective cross-sectional area of ​​intake passage 5 is adjusted, ultimately realizing the control of the amount of air entering the engine to adapt to different power requirements of the engine (such as low-speed cruising and high-speed acceleration).

[0040] When the throttle is stopped (the cable is loosened), the return torsion spring 6 first releases its reset force, causing the sector plate 8 to rotate in the reset direction. At this time, the sector plate 8 drives the throttle valve 3 to begin closing through the throttle valve shaft 4. Simultaneously, the sector disc 9 rotates synchronously with the sector rocker arm 10, causing the deformation of the auxiliary torsion spring 7 to gradually recover. The force is transmitted through the sector disc 9 to the sector rocker arm 10, and then indirectly acts on the sector plate 8, forming a "force in the same direction" with the return torsion spring 6, avoiding deformation fatigue caused by excessive force on a single torsion spring.

[0041] The edge of the throttle valve 3 is wrapped with an elastic sealing strip. The material of the strip needs to be resistant to high and low temperatures and have a certain degree of wear resistance. When the throttle valve 3 flips in the intake channel 5, the sealing strip always adheres to the inner wall of the channel. In the small opening state (such as low-speed cruising), the valve plate only flips slightly, and the strip can accurately control the size of the intake gap, avoiding excessive intake due to excessive gap. In the large opening state (such as rapid acceleration), when the throttle valve 3 is fully opened, the strip will be slightly squeezed to further enhance the sealing and prevent air from seeping in from the edge of the throttle valve 3.

[0042] The motorcycle engine ECU (Electronic Control Unit) collects signals such as engine speed, coolant temperature, and intake air temperature in real time. When the engine speed is detected to be lower or higher than the idle speed set range, it sends an adjustment command to the stepper motor 12. After receiving the command, the rotor inside the stepper motor 12 rotates step by step at fixed angles. The rotation of the output shaft of the stepper motor 12 drives the lead screw 13 to rotate. The lead screw 13 is connected to the sealing block 14 through the lead screw 13 nut. When the lead screw 13 rotates, the nut drives the sealing block 14 to rotate and move linearly within the idle bypass channel 2, sealing the idle bypass channel 2. The sealing block 14 has a conical sealing surface at its front end. The sealing block 14 is adapted to the conical inlet of the idle bypass channel 2. When it is necessary to increase the idle air intake, the sealing block 14 moves backward, and the gap between the conical sealing surface and the channel inlet increases. The airflow can smoothly pass through the idle bypass channel 2 into the intake manifold inside the motorcycle and be evenly distributed to each cylinder of the engine through the intake manifold. When it is necessary to reduce the intake, the sealing block 14 moves forward, and the conical sealing surface gradually fits the inlet of the idle bypass channel 2, and the gap narrows until the target intake volume is reached. In addition, the surface of the sealing block 14 is coated with high-temperature resistant sealing grease, which not only enhances the sealing effect but also reduces the friction between the sealing block 14 and the guide groove, extending the service life of the components.

[0043] Under special operating conditions (such as cold start), the engine needs more intake air to maintain the speed. The ECU will instruct the stepper motor 12 to drive the sealing block 14 to move backward significantly, so as to maximize the opening of the bypass channel. As the engine water temperature rises, the ECU gradually instructs the sealing block 14 to move forward, reducing the opening until the normal idle speed intake volume is reached.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A motorcycle electronic fuel injection throttle valve structure, characterized in that, include: Throttle body (1), an idle speed adjustment component is provided on one side of the throttle body (1) to regulate the intake volume of the idle speed bypass channel (2) provided in the throttle body (1) and realize stable control of engine idle speed; Throttle valve plate (3), the throttle valve plate (3) is rotatably connected to the throttle body (1) through the throttle valve shaft (4). The throttle valve plate (3) is rotated by the throttle valve shaft (4) to rotate and control the cross-sectional area of ​​the intake channel (5) in the throttle body (1) so as to adjust the intake volume in the intake channel (5). The return assembly is located on one side of the throttle body (1) and is used to automatically return the throttle valve plate (3) to the idle position. The return assembly includes a return torsion spring (6) and an auxiliary torsion spring (7). One end of the return torsion spring (6) is sleeved on the throttle valve shaft (4). The auxiliary torsion spring (7) and the return torsion spring (6) are connected by a connector. The auxiliary torsion spring (7) is linked with the return torsion spring (6) through the connector so that the auxiliary torsion spring (7) drives the return torsion spring (6) through the connector to complete the automatic return action of the throttle valve plate (3).

2. The motorcycle electronic fuel injection throttle structure according to claim 1, characterized in that: The connector includes a sector plate (8), which is fixedly sleeved on one end of the throttle valve shaft (4). One end of the return torsion spring (6) is connected to the sector plate (8), and the other end abuts against the protrusion on the surface of the throttle body (1).

3. The motorcycle electronic fuel injection throttle structure according to claim 1, characterized in that: A sliding shaft is connected to one side of the throttle body (1), and a fan-shaped disk (9) is rotatably sleeved on the sliding shaft. A fan-shaped rocker arm (10) is rotatably connected to the fan-shaped disk (9) through a pin, and the other end of the fan-shaped rocker arm (10) is rotatably connected to the fan-shaped plate (8) through a pin.

4. The motorcycle electronic fuel injection throttle structure according to claim 1, characterized in that: The auxiliary torsion spring (7) is sleeved on the sector plate (9). One end of the auxiliary torsion spring (7) is connected to the sector plate (9), and the other end abuts against the protrusion on the surface of the throttle body (1).

5. The motorcycle electronic fuel injection throttle structure according to claim 1, characterized in that: The throttle body (1) has two sets of intake pipes (11) on one side, and one end of the intake pipes (11) is connected to the intake channel (5).

6. The motorcycle electronic fuel injection throttle structure according to claim 1, characterized in that: The idle speed adjustment component includes a stepper motor (12), which is mounted on the throttle body (1) via a mounting base (15) and the output shaft of the stepper motor (12) is connected to a lead screw (13).

7. A motorcycle electronic fuel injection throttle structure according to claim 6, characterized in that: A sealing block (14) is connected to the lead screw (13) via a lead screw nut, and the sealing block (14) seals the idle bypass channel (2).

8. The motorcycle electronic fuel injection throttle structure according to claim 1, characterized in that: A slot (16) is provided inside the throttle valve shaft (4). The throttle valve plate (3) is inserted into the slot (16) and then screwed to the throttle valve shaft (4) for fixation.

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