JP4418306B2 - Motorcycle air box - Google Patents

Description

  The present invention relates to an air box for a motorcycle that takes in air pressurized by traveling wind pressure.

In some motorcycles, air compressed by traveling wind pressure (so-called ram pressure) is stored in an air box during traveling, and the intake efficiency is improved by sending the air into a combustion chamber. However, depending on the driving conditions, there is a case where no pressurization of air is required, and there is a case where the pressure in the air box can be adjusted.
2. Description of the Related Art As a conventional motorcycle air box having such a pressure regulating structure, there is known an air box having a pressure regulating valve at an end of an air cleaner box (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 62-35888

Patent Document 1 will be described. In addition, the code | symbol used what was described in the gazette.
As shown in FIG. 1 of the publication, the air cleaner box 1 has a cowling 4 penetrated to open the air intake 3 in a trumpet shape toward the front, and a rear air outlet 7 is provided. A pressure regulating valve 8 is provided at the mouth 7.

  The pressure regulating valve 8 is attached to the air cleaner box 1 so as to be freely opened and closed by a shaft 9. A wind receiving plate 11 exposed to the outside is attached to an end of the shaft 9, and the pressure regulating valve 8 is normally closed by a spring 10. Energize to the side.

  When the vehicle travels, air is taken in from the air intake 3 while being compressed into the air cleaner box 1. When the vehicle speed is increased, the wind receiving plate 11 is rotated by the wind pressure, and the shaft 9 is rotated accordingly to open the pressure regulating valve 8. Thereby, when the pressure in the air cleaner box 1 becomes equal to or higher than a predetermined pressure, air escapes from the escape port 7, so that the pressure in the air cleaner box 1 does not rise above the predetermined pressure.

  However, even when the pressure in the air cleaner box 1 is less than or equal to the predetermined pressure, when the throttle opening is small or in a partial state, the throttle grip is slightly opened and closed due to the influence of intake air pressure. As a result, the torque of the driving wheel is likely to fluctuate, which may make the vehicle run jerky and affect the running feeling.

  An object of the present invention is to provide an air box that has an air box that temporarily stores air compressed by ram pressure, and in particular, has a small throttle opening or that can improve running feeling in a partial state. It is in.

According to the first aspect of the present invention, an air intake port is provided at the front portion of the vehicle, the air intake port is connected to an air box, and a pressure regulating valve is provided at a relief port for releasing the pressure in the air box to the outside. In an air box of a motorcycle that accumulates air pressurized by the air box in the air box and sends the pressurized air from the air box to the combustion chamber of the engine via the throttle body, at least throttle control of the pressure regulating valve is performed. The opening degree is used as a parameter, and the pressure regulating valve is opened and closed according to the gear position of the transmission of the motorcycle .

In the invention according to claim 2 , when the gear position is for low speed, the pressure regulating valve is opened to open the inside of the air box to the outside, and when the gear position is for high speed, the pressure regulating valve is closed to add the inside of the air box. It is characterized by pressing.

The invention according to claim 3 is characterized in that the inside of the air box is opened to the outside when the throttle opening is in the closing direction, or when the throttle opening is not more than a predetermined opening.

The invention according to claim 4 is characterized in that when the throttle opening is in the opening direction and the throttle opening is equal to or less than a predetermined opening, the air box is opened to the outside.

  In the invention according to claim 1, since the pressure of the air pressurized by the traveling wind is adjusted using at least the throttle opening as a parameter, large torque fluctuations of the drive wheels are suppressed when the throttle opening is small or partial. This makes it possible to eliminate the jerky feeling of the vehicle traveling and improve the traveling feeling.

In addition , since the pressure regulating valve is opened and closed according to the gear position of the motorcycle transmission, it is possible to prevent the jerky feeling of vehicle running due to large torque fluctuations of the drive wheels that occur during low and medium speed gear positions. Feeling can be improved.

In the invention according to claim 2 , in the low speed gear position, the pressure regulating valve is opened to open the air box to the outside, and in the high speed gear position, the pressure regulating valve is closed to pressurize the air box. In the position, it is possible to prevent a jerky feeling due to a large torque fluctuation of the driving wheel, and it is possible to improve the engine output in the high-speed gear position. Therefore, it is possible to achieve both improvement in drivability during low-speed driving and improvement in driving performance during high-speed driving.

In the invention according to claim 3 , when the throttle opening is in the closing direction, or when the throttle opening is equal to or less than the predetermined opening, the inside of the air box is opened to the outside, so that the pressure in the pressurized air box can be reduced, For example, it is possible to prevent a jerky feeling due to large torque fluctuations of the drive wheels during deceleration, and to improve the running feeling of the vehicle.

In the invention according to claim 4 , when the throttle opening is in the opening direction and the throttle opening is equal to or less than the predetermined opening, the air box is opened to the outside, so that the pressure in the pressurized air box is reduced. For example, it is possible to prevent a jerky feeling due to a large torque fluctuation of the driving wheel during acceleration, and to improve the running feeling of the vehicle.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a motorcycle equipped with an air box according to the present invention. A motorcycle 10 includes a head pipe 11 and a pair of left and right main frames 12, 13 extending obliquely downward and rearward from the head pipe 11. Only the front side reference numeral 12 is shown), pivot plates 14 and 15 (only the front side reference numeral 14 are shown) connected to the rear parts of these main frames 12 and 13, respectively, and the front lower parts of the main frames 12 and 13 The vehicle body frame 20 is composed of a pair of left and right engine hangers 16 and 17 (only the reference numeral 16 is shown on the front side). The main frames 12 and 13, the pivot plates 14 and 15, and the engine hangers 16 and 17, A transmission 24 provided integrally with the engine 23 is supported.

  The engine 23 is a V-type including a front cylinder 26 and a rear cylinder 27, and a throttle body (not shown; described in FIG. 5) is attached to each of the front cylinder 26 and the rear cylinder 27. These throttle bodies are housed in an air box 31 disposed above the engine 23 and between the left and right main frames 12 and 13.

  The air box 31 is connected to an air intake 34 provided at the front portion of the front cowl 33 via an intake duct (not shown), and the intake duct is connected to the air intake 34 while the motorcycle 10 is running. The air pressurized by the traveling wind pressure is temporarily stored. This pressurized air is supplied to the combustion chamber of the engine 23 through the throttle body. Thus, by pressurizing the intake air with the traveling wind pressure (ram pressure), a large amount of air can be sent into the combustion chamber, and the intake efficiency can be increased.

  Here, 41 is a front fork, 42 is a front wheel, 43 is a front fender, 44 is a handle, 46 is a radiator, 47 is a fuel tank, 48 is a cover that covers the air box 31 and the fuel tank 47, 51 is a seat, 52 is a rear A frame, 53 is a swing arm, 54 is a pivot shaft of the swing arm 53, 56 is a rear cushion unit, 57 is a rear wheel, and 58 is a rear fender.

  FIG. 2 is a side view of the air box and the air intake duct according to the present invention (the arrow (FRONT in the figure indicates the front of the vehicle)), and an air intake duct 66 extending forward of the vehicle is connected to the side wall of the air box 31. Indicates that Reference numeral 68 denotes a connection portion between the air box 31 and the intake duct 66.

  The air box 31 includes a lower case 71 attached to the engine 23 (see FIG. 1), and an upper case 72 that covers the lower case 71. The upper case 72 includes a pressure regulating valve 73 that adjusts the pressure in the air box 31, and This is a member incorporating a diaphragm type actuator 74 for driving the pressure regulating valve 73. Reference numeral 75 denotes an intake port provided at the front end of the intake duct 66 for connection to the air intake 34 (see FIG. 1).

  FIG. 3 is a cross-sectional view showing the main part of the air box according to the present invention. The pressure regulating valve 73 opens and closes an opening 78 provided in the upper wall 77 of the air box 31. A support shaft 81 provided on a projecting portion 79 that protrudes inward, a valve base 82 that is swingably attached to the support shaft 81, and a plate-shaped valve body 84 that is attached to the valve base 82 with a plurality of rivets 83; Consists of. A filter 86 is attached to the outer edge of the opening 78.

The valve base 82 is integrally provided with a projecting piece 88, and a diaphragm type actuator 74 is connected to the projecting piece 88.
The diaphragm actuator 74 includes a case portion 91, a diaphragm 92 attached in the case portion 91, a movable portion 93 attached to the diaphragm 92, and a spring 94 that urges the movable portion 93 toward the pressure regulating valve 73. The hose connecting pipe 96 is attached to the case portion 91. 74A and 74B in the figure are a first chamber and a second chamber which are formed by separating the inside of the case portion 91 by a diaphragm 92.

  The case portion 91 includes a first case half 101 and a second case half 102, and the edge of the first case half 101 is crimped with the edge of the diaphragm 92 together with the edge of the second case half 102. The first case 101 is attached to the inclined wall portion 103 formed integrally with the upper wall portion 77, and the bottom of the second case 102 is raised to form the bottom raised portion 104.

  The movable portion 93 is a sliding member that sandwiches the central portion of the diaphragm 92 between the two plates 105 and 106 and crimps the plates 105 and 106 and the diaphragm 92 at one end portion of the rod portion 108 and opens the first case 101. The rod part 108 is movably inserted into the hole 107, the locking rod 109 is movably inserted into the rod part 108, and the lid member 111 is attached to the other end of the rod part 108 to prevent the locking rod 109 from coming off. It is what you did. Reference numeral 114 denotes a spring that biases the locking rod 109 toward the diaphragm 92.

The locking rod 109 is a member that is bent over the protruding piece 88 of the pressure regulating valve 73 by bending its tip.
The hose connection pipe 96 is a pipe for connecting a hose 116 that draws a negative pressure from the throttle body side.

Next, the operation of the pressure regulating valve 73 and the diaphragm actuator 74 described above will be described.
FIG. 4 is an operation diagram showing the operation of the pressure regulating valve and the diaphragm type actuator according to the present invention.
Since the first chamber 74A communicates with the outside through a not-shown through hole, atmospheric pressure is applied to the inside, and therefore the second chamber 74B of the diaphragm type actuator 74 is connected to the second chamber 74B via the hose 116 and the hose connection pipe 96. When the negative pressure is applied, the movable portion 93 moves to the second chamber 74B side as indicated by an arrow a, and one end portion of the rod portion 108 hits the bottom raising portion 104 of the second case half 102.

  As a result, the pressure regulating valve 73 attached to the locking rod 109 of the movable portion 93 swings as indicated by the arrow b around the support shaft 81, and the inside of the air box 31 communicates with the outside through the opening 78. Accordingly, the air in the air box 31 pressurized by the traveling wind pressure escapes to the outside from the opening 78 as indicated by the arrow c, so that the pressure in the air box 31 decreases and the ram pressure is supplied to the intake pipe. Will disappear.

5 (a) and 5 (b) are explanatory views showing the configuration and operation for opening / closing and controlling the pressure regulating valve according to the present invention.
In (a), the opening / closing / control mechanism 120 for opening / closing and controlling the pressure regulating valve 73 is connected to the suction passage 122 of the throttle body 121 to obtain a negative pressure, and to the tip of the vacuum hose 123. A check valve 126, a negative pressure accumulation chamber 124 in which the check valve 126 is disposed, a pipe 127 connecting the chamber 124 and the diaphragm actuator 74, and an intermediate part of the pipe 127. The switching valve 128, the solenoid 131 that drives the switching valve 128, and the control device 132 that sends an on / off signal (on signal SON (see (b)) or off signal SOFF) that turns the solenoid 131 on and off. And the gear position information GJ by detecting the gear position of the transmission 24 (see FIG. 1). A gear position switch 133 sends to the controller 132, consisting of a throttle opening sensor 134 which sends a throttle opening signal KS to the controller 132 detects the opening degree of the throttle valve. A throttle valve 135 opens and closes the intake passage 122 of the throttle body 121 and opens and closes in conjunction with an operation of a throttle grip (not shown).

The check valve 126 allows the flow of air from the inside of the chamber 124 toward the vacuum hose 123 and blocks the flow of air in the reverse direction. Therefore, a negative pressure is always maintained in the chamber 124.
The chamber 124 is a chamber that maintains a negative pressure state when air is drawn by the negative pressure in the intake passage 122 while the engine is operating.

  The switching valve 128 includes a sleeve 136 and a valve body 137 movably inserted into the sleeve 136, and the valve body 137 is a member in which a first flow path 141 and a second flow path 142 are formed. Reference numerals 145 and 146 denote a first sleeve passage and a second sleeve passage provided in the sleeve 136, 147 denotes a sleeve third passage, 148 communicates with the sleeve third passage 147 and opens to the atmosphere, and 151 denotes an open passage. This is a filter provided at the tip of the passage 148.

  The solenoid 131 includes a rod 153. The rod 153 protrudes when the solenoid 131 is energized (that is, turned on), and the rod 153 is retracted when the solenoid 131 is not energized (that is, when it is turned off). The valve body 137 of the valve 128 moves and the first flow path 141 and the second flow path 142 are switched.

Next, the operation of the opening / closing / control mechanism 120 will be described.
For example, when the motorcycle is running and the gear position of the transmission is 5th or 6th, the control device 132 sends an off signal to the solenoid 131 based on the gear position information GJ from the gear position switch 133. Send SOFF.

  Thereby, the solenoid 131 maintains the valve body 137 in the state shown in the figure. That is, since the second flow path 142 of the valve body 137 is connected to the sleeve second path 146 and the sleeve third path 147 of the sleeve 136, the inside of the diaphragm actuator 74 is the pipe 127, the sleeve second path 146, the second flow path. 142, the sleeve third passage 147, and the open passage 148 are opened to the atmosphere, and the diaphragm actuator 74 does not move the movable portion 93 (see FIG. 3), so the pressure regulating valve 73 is closed. At this time, the control based on the throttle opening is not performed.

  In (b), for example, when the motorcycle is running, if the gear position of the transmission is one of the first to third gears, the control device is based on the gear position information GJ from the gear position switch 133. 132 sends an on signal SON to the solenoid 131.

  Thereby, the solenoid 131 moves the valve body 137 in the direction of the arrow d. As a result, the first flow path 141 of the valve body 137 is connected to the sleeve first passage 145 and the sleeve second passage 146 of the sleeve 136, so that the inside of the diaphragm actuator 74 is the pipe 127, the sleeve second passage 146, the first flow The state is connected to the chamber 124 via the passage 141, the sleeve first passage 145, and the pipe 127, and the negative pressure in the chamber 124 acts in the diaphragm actuator 74, so that the diaphragm actuator 74 is moved to the movable portion 93 (FIG. 3). Therefore, the pressure regulating valve 73 is opened. As a result, the ram pressure is released and ram pressure supply is not performed. Also, control by throttle opening is not performed.

  Further, for example, when the motorcycle is running and the gear position of the transmission is the fourth speed, the gear position information GJ from the gear position switch 133 and the throttle opening signal from the throttle opening sensor 134 are displayed. Based on KS, the control device 132 sends an ON signal SON or an OFF signal SOFF (see (a)) to the solenoid 131 to open or close the pressure regulating valve 73. Control of opening and closing of the pressure regulating valve 73 at this time will be described in detail with reference to FIG.

FIG. 6 is a flowchart showing the opening / closing control of the pressure regulating valve according to the present invention. STXX represents a step number.
ST01 ... Read the gear position of the transmission.
ST02 ... It is determined whether the gear position is a predetermined one.
If the gear position is not a predetermined one (eg, 4th gear) (NO), the process is terminated.
If the gear position is a predetermined one (for example, 4th gear) (YES), the process proceeds to ST03.

ST03 ... The throttle opening degree threshold value A, the throttle opening degree closing threshold value B, the ram pressure release waiting timer setting time T1, and the ram pressure release timer setting time T2 are read.
The throttle opening degree threshold A is a predetermined throttle opening degree when the throttle opening is gradually opened by operating the throttle grip, and is an opening degree close to full opening.
The throttle opening closing threshold B is a predetermined throttle opening when the throttle opening is gradually closed by operating the throttle grip, and is an opening close to full closing.

The ram pressure release wait timer setting time T1 is a waiting time before releasing the ram pressure, and is set by the ram pressure release wait timer.
The ram pressure release timer set time T2 is a time for releasing the ram pressure. When the ram pressure release wait timer set time T1 has elapsed, the ram pressure release timer is turned on, and the time set by this ram pressure release timer When T2 elapses, the ram pressure release timer is turned off.

  The above-described ram pressure release waiting timer set time T1 and ram pressure release timer set time T2 are provided according to the preference of the rider who operates the motorcycle without delaying the opening and closing of the pressure regulating valve immediately when the throttle grip is operated. This is to increase the degree of freedom in setting drivability.

ST04 ... It is determined whether or not the operation is in the throttle closing direction, that is, the throttle valve is closed.
If the throttle is not closed (NO), that is, if the throttle is open (if the throttle valve is opened), the process proceeds to ST05.
If the throttle is closed or the throttle is maintained (the opening of the throttle valve is maintained) (YES), the process proceeds to ST07.

ST05 ... It is determined whether the throttle opening degree θTH is greater than or equal to the throttle opening degree opening side threshold A.
If θTH ≧ A is not satisfied (NO), that is, if θTH <A, the process proceeds to ST06.
If θTH ≧ A (YES), the process proceeds to ST13.
The throttle opening degree threshold A is about 15 to 40%, preferably 30%.
ST06: The solenoid is turned on to release the ram pressure.

ST07 ... It is determined whether the throttle opening θTH is smaller than the throttle opening closing threshold B.
If θTH <B is not satisfied (NO), that is, if θTH ≧ B, the process proceeds to ST09.
If θTH <B (YES), the process proceeds to ST08.
ST08 ... Turn on the ram pressure release wait timer.

ST09 ... It is determined whether the ram pressure release waiting timer set time T1≤0 (zero), that is, whether T1 has elapsed.
If T1 ≦ 0 is not satisfied (NO), that is, if T1 has not elapsed, the process proceeds to ST13.
If T1 ≦ 0 (YES), that is, if T1 has elapsed, the process proceeds to ST10.
ST10: Turn on the ram pressure release timer.

ST11 ... It is determined whether the ram pressure release timer set time T2 ≦ 0 (zero), that is, whether T2 has elapsed.
If T2 ≦ 0 is not satisfied (NO), that is, if T2 has not elapsed, the process proceeds to ST12.
If T2 ≦ 0 (YES), that is, if T2 has elapsed, the process proceeds to ST13.
ST12: The solenoid is turned on to release the ram pressure.
ST13 ... The solenoid is turned off to increase the ram pressure.

  FIG. 7 is a graph showing the ram pressure release / pressurization state according to the change of the throttle opening according to the present invention, which is based on the pressure regulating valve opening / closing control in the flowchart shown in FIG. The vertical axis of the graph shows throttle opening θTH, ram pressure release waiting timer (ON or OFF), ram pressure release timer (ON or OFF), solenoid operation (ON or OFF), ram pressure (pressurization) The horizontal axis represents time T.

  For example, the throttle opening θTH is gradually decreased from the state where the throttle opening θTH is C at time T = 0 (zero). When the throttle opening θTH falls below the threshold value B, the ram pressure release waiting timer is turned on and turned off after the set time T1 has elapsed.

When the ram pressure release waiting timer is turned off, the ram pressure release timer is turned on this time, and is turned off after the set time T2 has elapsed.
Thus, when the ram pressure release timer is ON, the solenoid is turned ON, and the ram pressure that has been in the pressurized state is released.

  From the state where the throttle opening θTH is smaller than the threshold value B, when the throttle opening θTH gradually increases again to become the threshold value A, the solenoid that has been turned on until then is turned off. The pressure changes from the open state to the pressurized state. Even when the throttle opening θTH exceeds the threshold A, the ram pressure pressurization state is maintained.

  When the throttle opening θTH is gradually increased, if the throttle opening θTH is smaller than the threshold value A, the solenoid is turned on, and when the time T is t3, the ram pressure release timer is turned off. The solenoid remains on.

  As described above with reference to FIGS. 1, 3 and 5 (a), 5 (b), according to the present invention, first, an air intake 34 is provided at the front of the vehicle, and the air intake 34 is connected to an air box. 31 and a pressure regulating valve 73 is provided in an opening 78 as an escape port for releasing the pressure in the air box 31 to the outside, and the air pressurized by the traveling wind is accumulated in the air box 31. In the air box 31 of the motorcycle 10 that sends pressurized air to the combustion chamber of the engine 23 through the throttle body 121, the opening / closing control of the pressure regulating valve 73 is performed using at least the throttle opening as a parameter.

  Since the pressure of the air pressurized by the traveling wind is adjusted using at least the throttle opening as a parameter, when the throttle opening is small or partial, more specifically, the throttle valve 135 is temporarily connected to the corner entrance for deceleration. When operating on the closing side and operating the throttle valve 135 on the opening side for acceleration at the corner exit, the large torque fluctuation of the rear wheel 57 as the driving wheel can be suppressed, which makes the vehicle running jerky. It can be eliminated, and the running feeling can be improved and acceleration / deceleration during cornering can be performed smoothly.

Second, the present invention is characterized in that the pressure regulating valve 73 is opened and closed according to the gear position of the transmission 24 of the motorcycle 10.
Since the pressure regulating valve 73 is opened and closed in accordance with the gear position of the transmission 24 of the motorcycle 10, it is possible to prevent the jerky feeling of the vehicle traveling due to the large torque fluctuation of the driving wheel generated at the low / medium speed gear position, Travel feeling can be improved.

  Thirdly, when the gear position is for low speed, the present invention opens the pressure regulating valve 73 to open the air box 31 to the outside, and when the gear position is for high speed, the pressure regulating valve 73 is closed to close the air box 31. The inside is pressurized.

  In the low speed gear position, the pressure regulating valve 73 is opened to open the air box 31 to the outside, and in the high speed gear position, the pressure regulating valve 73 is closed to pressurize the air box 31. A jerky feeling due to a large torque fluctuation of the wheel 57 can be prevented, and the engine output can be improved in the high-speed gear position. Therefore, it is possible to achieve both improvement in drivability during low-speed driving and improvement in driving performance during high-speed driving.

Fourthly, the present invention is characterized in that the inside of the air box 31 is opened to the outside when the throttle opening is in the closing direction or when the throttle opening is equal to or less than a threshold value B as a predetermined opening.
When the throttle opening is in the closing direction or less than the predetermined opening B, the inside of the air box 31 is opened to the outside, so that the pressure in the pressurized air box 31 can be lowered. The jerky feeling caused by the large torque fluctuation of the rear wheel 57 can be prevented, and the running feeling of the motorcycle 10 can be improved.

Fifth, the present invention is characterized in that the inside of the air box 31 is opened to the outside when the throttle opening is in the opening direction and the throttle opening is equal to or less than a threshold value A as a predetermined opening.
When the throttle opening is in the opening direction and the throttle opening is equal to or less than the predetermined opening A, the inside of the air box 31 is opened to the outside, so that the pressure in the pressurized air box 31 can be reduced, For example, a jerky feeling due to a large torque fluctuation of the rear wheel 57 at the time of acceleration can be prevented, and the running feeling of the motorcycle 10 can be improved.

  In the embodiment of the present invention, the opening / closing control of the pressure regulating valve is performed using the gear position and the throttle opening as parameters. However, the present invention is not limited thereto, and the vehicle speed, the engine speed, and the suction negative pressure in the intake passage may be used as parameters. Good. Moreover, you may replace the air box 31 of this embodiment with an air cleaner box.

  The air box of the present invention is suitable for a motorcycle.

1 is a side view of a motorcycle including an air box according to the present invention. It is a side view of an air box and an intake duct according to the present invention. It is sectional drawing which shows the principal part of the air box which concerns on this invention. It is an action figure which shows the effect | action of the pressure regulation valve which concerns on this invention, and a diaphragm type actuator. It is explanatory drawing which shows the structure and effect | action for opening and closing and controlling the pressure regulation valve which concerns on this invention. It is a flowchart which shows the opening / closing control of the pressure regulation valve which concerns on this invention. It is a graph which shows the open / pressurized state of the ram pressure by the change of the throttle opening which concerns on this invention.

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 23 ... Engine, 24 ... Transmission, 31 ... Air box, 34 ... Air intake, 73 ... Pressure regulating valve, 78 ... Escape port (opening), 121 ... Throttle body, [theta] TH ... Throttle opening.

Claims (4)

An air intake is provided at the front of the vehicle, and the air intake is connected to an air box. A pressure regulating valve is provided at a relief port for releasing the pressure in the air box to the outside. In an air box of a motorcycle that accumulates in the air box and sends pressurized air from the air box to the combustion chamber of the engine through the throttle body,
The opening / closing control of the pressure regulating valve is performed with at least the throttle opening as a parameter ,
Eabokku scan of the motorcycle, characterized in that opening and closing in accordance with the pressure regulating valve to the gear position of the transmission of the motorcycle. When the gear position is for low speed, the pressure regulating valve is opened to open the inside of the air box to the outside, and when the gear position is for high speed, the pressure regulating valve is closed to pressurize the inside of the air box. The motorcycle air box according to claim 1 .   The motorcycle air box according to claim 1, wherein when the throttle opening is in a closing direction or when the throttle opening is equal to or less than a predetermined opening, the air box is opened to the outside.   The motorcycle air box according to claim 1, wherein when the throttle opening is an opening direction and the throttle opening is equal to or less than a predetermined opening, the inside of the air box is opened to the outside.

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