Straddle type vehicle with variable air inlet mechanism

Abstract

The utility model relates to a straddle type vehicle with a variable air inlet mechanism. The straddle type vehicle comprises a vehicle frame, an engine assembly, an air inlet system and a control unit. The engine assembly is arranged on the frame, and a cylinder head assembly of the engine assembly comprises a cylinder head, a cylinder head cover, a cam shaft, an air inlet rocker arm set and an actuator. The air inlet rocker arm set comprises a rocker arm shaft, a first rocker arm, a second rocker arm and a connecting mechanism, and the connecting mechanism can slide between a first position and a second position in the direction of the rocker arm shaft, is controlled by a first signal provided by the control unit and is used for separating or connecting the first rocker arm and the second rocker arm. The air inlet system is communicated with the engine assembly, is provided with an air filter, and comprises an air inlet box, an air inlet pipe and a pipe length variable mechanism. The pipe length variable mechanism comprises a mounting part, a driver, a sliding rail and a lengthening pipe, a connecting part of the lengthening pipe is linked with the driver to slide on the sliding rail, and the lengthening pipe is controlled by a second signal provided by the control unit and used for combining or separating the lengthening pipe and the air inlet pipe.

Description

Technical Field

[0001] The utility model relates to a straddle-type vehicle with a variable air intake mechanism, in particular to a straddle-type vehicle with a variable air intake mechanism suitable for a fuel engine. Background Art

[0002] The variable intake system disclosed in the prior art, such as Taiwan Utility Patent No. M639109, has a simple control strategy, controls the high and low speed pipe lengths according to the speed, and only uses the full throttle performance as the switching setting basis. It is generally impossible to make the best setting according to the load control such as idle speed / fuel consumption. In other words, it is impossible to simply use the above prior art to make the best setting in the following five areas: (1) The idle speed area requires a smaller valve timing overlap angle to increase combustion stability, (2) The low load area requires the intake valve closing timing to be delayed to reduce the intake volume and reduce pump loss, (3) The fuel consumption area requires low pump loss, (4) The low speed and high load area requires the intake valve closing timing to be advanced to increase the volumetric efficiency, and (5) The high speed and high load area requires the intake valve closing timing to be delayed to increase the volumetric efficiency.

[0003] The prior art, such as the variable valve lift engine disclosed in Taiwan Patent No. M646541 or M616195, has a simple control strategy, which controls the high and low speed intake cams according to the speed, and only uses the full throttle performance as the switching setting basis. It is generally impossible to make the best setting according to the load control such as idle speed / fuel consumption interval. For example, it is impossible to simultaneously take into account the best settings of the following operating areas: (1) The fuel consumption area and the low speed and high load operating area require high inertia, at which time the intake system needs to be adjusted to increase the volumetric efficiency; (2) The high speed and high load operating area requires low impedance and high flow to increase the volumetric efficiency, at which time a larger intake cross-sectional area or a shorter pipe length is required to reduce impedance.

[0004] The inventor, motivated by this and based on a spirit of active invention, has been eager to devise a straddle-type vehicle with a variable air intake mechanism that can solve the above-mentioned problems. After several studies and experiments, the present utility model has been finally completed. Utility Model Content

[0005] The main purpose of the utility model is to provide a straddle-type vehicle with a variable intake mechanism, wherein the straddle-type vehicle integrates the variable intake mechanism with an engine with a variable valve lift, and through adjustment, can achieve (1) improved combustion efficiency, (2) increased power and torque, (3) reduced fuel consumption and emissions, (4) improved engine performance, and (5) a balance between power and combustion efficiency, which is actually an optimized design.

[0006] To achieve the above-mentioned purpose, the straddle-type vehicle with a variable intake mechanism of the utility model includes a vehicle frame, an engine assembly, an intake system and a control unit. The engine assembly is arranged on the vehicle frame, and the engine assembly includes a cylinder head assembly, a cylinder and a crankcase. The cylinder head assembly includes a cylinder head, a cylinder head cover, a camshaft, an intake rocker arm group and an actuator. Among them, the cylinder head is combined with the cylinder, the cylinder is combined with the crankcase, and the camshaft is pivoted on the cylinder head. The intake rocker arm group includes a rocker arm shaft, a first rocker arm, a second rocker arm and a connecting mechanism. The rocker arm shaft is supported on the cylinder head, the first rocker arm and the second rocker arm are pivoted on the rocker arm shaft, the first rocker arm and the second rocker arm are driven by the camshaft to rotate, and the connecting mechanism can slide between a first position and a second position along the direction of the rocker arm shaft to separate or connect the first rocker arm and the second rocker arm. The first position is to separate the first rocker arm and the second rocker arm, and the second position is to connect the first rocker arm and the second rocker arm.

[0007] The air intake system is connected to the engine assembly and has at least one air filter. The air filter includes an air intake box, an air intake pipe connected to the air intake box, and a variable pipe length mechanism. The variable pipe length mechanism includes a mounting portion, a driver, a slide rail, and an extension pipe. The mounting portion is disposed in the air intake box, and the slide rail and the driver are disposed on the mounting portion. The extension pipe has a connecting portion that can slide on the slide rail. The connecting portion is linked to the driver and can slide on the slide rail under the driving force of the driver to combine or separate the extension pipe from the air intake pipe. The control unit is electrically connected to the actuator and the driver. The control unit provides a first signal to control the actuator, causing the connecting mechanism to slide to the first position or the second position, thereby enabling the first rocker arm to be selectively separated from or connected to the second rocker arm, and the control unit provides a second signal to control the driver, thereby enabling the extension pipe to be selectively combined with or separated from the air intake pipe.

[0008] Through the above design, the above straddle-type vehicle can be tuned to achieve (1) improved combustion efficiency: allowing the engine to adjust the valve timing and intake resonance according to different driving conditions, thereby improving combustion efficiency; (2) improved power and torque: an effective variable timing and intake system can optimize engine performance, improve the volumetric efficiency of the operating point, provide greater power and torque output, and have a wider range of performance usage areas; (3) reduced fuel consumption and emissions: through improved volumetric efficiency to reduce brake specific fuel consumption (BSFC, Brake Specific Fuel Consumption), more efficient use of fuel, can reduce fuel consumption and reduce emissions; (4) improved engine performance: allowing the intake flow to be optimized at different speeds to improve engine performance; (5) balanced power and combustion efficiency: the variable timing and intake system helps to achieve better power balance and combustion efficiency under different driving conditions.

[0009] The driver comprises a driving member and a push rod connected to the driving member, the connecting portion is linked to the push rod, and the driving member is electrically connected to the control unit.

[0010] The cylinder head or cylinder head cover of the above-mentioned cylinder head assembly may be provided with a mounting seat surface and a mounting hole. The actuator may be an electromagnetic device, which may include a flange, a cylindrical shell, a seat plate, a spindle, a coil and a plunger. The actuator passes through the mounting hole with a flange and is assembled on the mounting seat surface with a seat plate. The coil and the plunger are assembled inside the cylindrical shell. The spindle passes through the cylindrical shell and is linked to the plunger. The connecting mechanism may include a push rod, a connecting pin and a first return spring. The first return spring provides a preload to urge the connecting pin to abut against the push rod. The push rod abuts between the spindle and the connecting pin. The connecting pin can slide between the first position and the second position under the driving force of the actuator and the thrust of the first return spring.

[0011] The cylinder head cover may also be provided with a rotation speed detector for detecting the rotation signal of the camshaft and connecting it to the control unit.

[0012] The frame may include a head tube, a main tube, a bottom tube, a cross tube and a tail tube. When viewed from the side of the straddle-type vehicle, the cylindrical housing and the speed detector are arranged behind the main tube, above the bottom tube, below the cross tube and in front of the tail tube. The tail tube may be an ascending curved section. The above arrangement facilitates the disassembly and maintenance of the actuator and the speed detector.

[0013] The above-mentioned cylinder head assembly can be another type of embodiment, and the cylinder head can be provided with an oil supply passage, a rocker arm oil passage and an oil return passage. The first rocker arm is provided with a first piston hole, and the second rocker arm is provided with a second piston hole. The connecting mechanism may include a synchronous piston, a stop piston and a second return spring. The stop piston slides in the second piston hole, and the second return spring presses against the stop piston and the second rocker arm. The rocker arm oil passage is connected to the first piston hole, and the synchronous piston can slide in the first piston hole and the second piston hole under the oil pressure of the rocker arm oil passage and the drive of the stop piston. The actuator may be an oil circuit controller, comprising an oil control valve housing, an oil control valve and an electromagnetic unit. The oil control valve housing has a chamber and may be provided with an oil inlet hole, an oil outlet hole and an oil return hole. The oil control valve group is arranged in the chamber. The oil supply passage is connected to the oil control valve via the oil inlet hole, the oil outlet hole is connected to the connecting mechanism via the rocker arm oil passage, and the oil return hole is connected to the oil return passage. The first signal controls the electromagnetic unit to drive the oil control valve so that the oil supply passage is disconnected or connected to the rocker arm oil passage, thereby causing the synchronous piston to slide between the first position and the second position.

[0014] The engine assembly can swing and rotate relative to the vehicle frame.

[0015] The engine assembly can be locked to the vehicle frame.

[0016] The straddle-type vehicle may be a scooter-type motorcycle.

[0017] The above summary and the following detailed description are exemplary in nature and are intended to further illustrate the scope of the patent application of the present utility model. Other purposes and advantages of the present utility model will be described in the subsequent specific implementation methods and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1A It is a left side view of a straddle-type vehicle with a variable air intake mechanism according to the first embodiment of the utility model.

[0019] Figure 1B It is a left side view of the engine assembly of the first embodiment of the utility model.

[0020] Figure 2A It is a right side view of a straddle-type vehicle with a variable air intake mechanism according to the first embodiment of the utility model.

[0021] Figure 2B It is a right side view of the engine assembly of the first embodiment of the utility model.

[0022] Figure 3 It is a partial exploded view of a straddle-type vehicle with a variable air intake mechanism according to a first embodiment of the utility model.

[0023] Figure 4 It is a three-dimensional diagram of the engine assembly of the first embodiment of the utility model.

[0024] Figure 5 It is a partial exploded view of the engine assembly of the first embodiment of the utility model.

[0025] Fig. 6A This is a cross-sectional view of a cylinder head assembly with a connecting pin sliding to a first position according to the first embodiment of the utility model.

[0026] Figure 6B It is a cross-sectional view of the cylinder head assembly with the connecting pin sliding to the second position according to the first embodiment of the utility model.

[0027] Fig. 7A It is a left side view of a straddle-type vehicle with a variable air intake mechanism according to a second embodiment of the utility model.

[0028] Figure 7B It is a left side view of the engine assembly of the second embodiment of the utility model.

[0029] Fig. 8A It is a right side view of a straddle-type vehicle with a variable air intake mechanism according to a second embodiment of the utility model.

[0030] Figure 8B It is a right side view of the engine assembly of the second embodiment of the utility model.

[0031] Fig. 9 It is a partial exploded view of a straddle-type vehicle with a variable air intake mechanism according to a second embodiment of the utility model.

[0032] Fig.10 It is a top view of an engine assembly according to a second embodiment of the present invention.

[0033] Fig.11 It is a partial cross-sectional view of a cylinder head assembly according to a second embodiment of the present invention.

[0034] Fig. 12A It is a schematic diagram of the oil circuit of the cylinder head assembly when the synchronous piston slides to the second position according to the second embodiment of the utility model.

[0035] Fig. 12B It is a schematic diagram of the oil circuit of the cylinder head assembly when the synchronous piston slides to the first position according to the second embodiment of the utility model.

[0036] Description of main component symbols:

[0037] 1a, 1b Straddle-type vehicles

[0038] 2a, 2b Frame

[0039] 21 Head tube

[0040] 22 Supervisor

[0041] 23 Bottom tube

[0042] 24 Cross-tube

[0043] 25 Tail pipe

[0044] 3a, 3b Engine assembly

[0045] 31a, 31b Cylinder head assembly

[0046] 311a, 311b Cylinder head

[0047] 3111 Oil supply channel

[0048] 3112 rocker oil channel

[0049] 3113 Oil return channel

[0050] 312a Cylinder head cover

[0051] 313a Camshaft

[0052] 3131a First intake cam

[0053] 3132a Second intake cam

[0054] 314a Intake rocker arm assembly

[0055] 3141a Rocker arm shaft

[0056] 3142a, 3142b First rocker arm

[0057] 3143a, 3143b Second rocker arm

[0058] 3144a, 3144b Connection mechanism

[0059] 315a, 315b Actuator

[0060] 32a, 32b Cylinder

[0061] 33a, 33b Crankcase

[0062] 4a, 4b Air intake system

[0063] 40a, 40b Air filter

[0064] 41a, 41b Air intake box

[0065] 42a, 42b Intake pipe

[0066] 43a, 43b Tube length variable mechanism

[0067] 431a, 431b Mounting section

[0068] 432a, 432b drivers

[0069] 4321a, 4321b Drive

[0070] 4322a, 4322b Putter

[0071] 433a, 433b Slide rails

[0072] 434a, 434b Growth tube

[0073] 4341a, 4341b Connection

[0074] 5. Speed ​​detector

[0075] 6 Control unit

[0076] a1 Flange

[0077] a2 Cylindrical shell

[0078] a3 Seat plate

[0079] a4 spindle

[0080] a5 Coil

[0081] a6 Plunger

[0082] a7 Ejector

[0083] a8 Connecting pin

[0084] a9 First return spring

[0085] b1 Synchronous piston

[0086] b2 Stop piston

[0087] b3 Second return spring

[0088] b4 Oil control valve housing

[0089] b40 chamber

[0090] b5 oil control valve

[0091] b6 Solenoid unit

[0092] D Mounting surface

[0093] H Mounting hole

[0094] h1 First piston hole

[0095] h2 Second piston hole

[0096] h3 Oil inlet hole

[0097] h4 oil outlet

[0098] h5 oil return hole DETAILED DESCRIPTION

[0099] See also Figures 1A to 4 , which are respectively a left side view of a straddle-type vehicle with a variable air intake mechanism, a left side view of an engine assembly, a right side view of a straddle-type vehicle, a right side view of an engine assembly, a partial exploded view of a straddle-type vehicle, and a stereoscopic view of an engine assembly of the first embodiment of the utility model. The figure shows a straddle-type vehicle 1a with a variable air intake mechanism, which mainly includes: a frame 2a, an engine assembly 3a, an intake system 4a, a speed detector 5, and a control unit 6. In this embodiment, the straddle-type vehicle 1a is a scooter, and the engine assembly 3a is a swinging engine that can swing and rotate relative to the frame 2a, but it is not limited to this. The engine assembly 3a can also be a fixed-locking engine that is fixed to the frame 2a. In addition, the frame 2a includes a head pipe 21, a main pipe 22, a bottom pipe 23, a cross pipe 24, and a tail pipe 25, and the tail pipe 25 is an ascending curved section.

[0100] like Figure 1B and Figure 3As shown, the air intake system 4a used in the utility model is connected to the engine assembly 3a and has at least one air filter 40a. The air filter 40a includes an air intake box 41a, an air intake pipe 42a connected to the air intake box 41a, and a pipe length variable mechanism 43a. The pipe length variable mechanism 43a includes a mounting portion 431a, a driver 432a, a slide rail 433a, and an extension pipe 434a. The mounting portion 431a is disposed in the air intake box 41a. The driver 432a includes a driving member 4321a and a push rod 4322a connected to the driving member 4321a. The driving member 4321a is electrically connected to the control unit 6. The slide rail 433a and the driver 432a are arranged on the mounting portion 431a. The growth tube 434a has a connection portion 4341a that can slide on the slide rail 433a. The connection portion 4341a is linked with the push rod 4322a of the driver 432a. The connection portion 4341a can slide on the slide rail 433a under the driving force of the driver 432a to connect or separate the growth tube 434a and the intake pipe 42a. Through the above design, the intake system 4a of the utility model can adjust the overall length of the intake pipe 42a by making the growth tube 434a selectively connect or separate with the intake pipe 42a, so as to simultaneously improve the power performance at high and low speeds and improve the engine fuel consumption level and maintain cost competitiveness. In addition, the configuration structure of the air intake system 4a of the utility model can reduce the demand for lateral space of the air intake box 41a, so as to facilitate configuration on models with smaller space, and can be modularly disassembled and assembled to facilitate maintenance convenience and system commonality.

[0101] Please also read Figure 5 , Fig. 6A and Figure 6B, which are respectively a partial exploded view of the engine assembly of the first embodiment of the utility model, a cross-sectional view of the cylinder head assembly with the connecting pin sliding to the first position, and a cross-sectional view of the cylinder head assembly with the connecting pin sliding to the second position. As shown in the figure, the engine assembly 3a of this embodiment is arranged on the frame 2a, and the engine assembly 3a includes a cylinder head assembly 31a, a cylinder 32a and a crankcase 33a. The cylinder head assembly 31a includes a cylinder head 311a, a cylinder head cover 312a, a camshaft 313a, an intake rocker arm group 314a and an actuator 315a. Among them, the cylinder head 311a is combined with the cylinder 32a, the cylinder 32a is combined with the crankcase 33a, and the camshaft 313a is pivoted to the cylinder head 311a and includes a first intake cam 3131a and a second intake cam 3132a. The intake rocker arm assembly 314a includes a rocker arm shaft 3141a, a first rocker arm 3142a, a second rocker arm 3143a and a connecting mechanism 3144a. The rocker arm shaft 3141a is supported by the cylinder head 311a. The first rocker arm 3142a and the second rocker arm 3143a are pivotally mounted on the rocker arm shaft 3141a. The first rocker arm 3142a and the second rocker arm 3143a are respectively driven by the first intake cam 3131a and the second intake cam 3132a of the camshaft 313a to rotate.

[0102] In this embodiment, the cylinder head cover 312a is provided with a mounting seat surface D and a mounting hole H, but it is not limited thereto, and other configurations may also be used. For example, a mounting seat surface D and a mounting hole H may also be provided on the cylinder head 311a. The actuator 315a is an electromagnetic device, including a flange a1, a cylindrical shell a2, a seat plate a3, a spindle a4, a coil a5 and a plunger a6. The actuator 315a has a flange a1 passing through the mounting hole H and is assembled on the mounting seat surface D with the seat plate a3, the coil a5 and the plunger a6 are assembled in the cylindrical shell a2, and the spindle a4 passes through the cylindrical shell a2 and is linked with the plunger a6. The connecting mechanism 3144a includes a push rod a7, a connecting pin a8 and a first return spring a9. The first return spring a9 provides a preload to push the connecting pin a8 toward the push rod a7. The push rod a7 abuts between the spindle a4 and the connecting pin a8. The connecting pin a8 of the connecting mechanism 3144a can slide between a first position and a second position by the driving force of the actuator 315a and the thrust of the first return spring a9, so as to separate or connect the first rocker arm 3142a and the second rocker arm 3143a. Fig. 6A As shown, when the connecting pin a8 is located at the first position, the first rocker arm 3142a and the second rocker arm 3143a are in a separated state. Figure 6B As shown, when the connecting pin a8 is located at the second position, the first rocker arm 3142a and the second rocker arm 3143a are in a connected state.

[0103] In addition, the control unit 6 is electrically connected to the actuator 315a and the driver 432a. The control unit 6 provides a first signal to control the actuator 315a, causing the connecting pin a8 of the connecting mechanism 3144a to slide to the first position or the second position, thereby enabling the first rocker arm 3142a to selectively separate or connect with the second rocker arm 3143a. The control unit 6 provides a second signal to control the driver 432a, thereby enabling the growth pipe 434a to selectively connect or separate with the intake pipe 42a.

[0104] Furthermore, the cylinder head cover 312a of this embodiment is also provided with a rotation speed detector 5 for detecting the rotation signal of the camshaft 313a and connecting it to the control unit 6. Figure 1A As shown, when viewed from the side of the straddle-type vehicle 1, the speed detector 5 is arranged behind the main pipe 22, above the bottom pipe 23, below the straddle pipe 24, and in front of the tail pipe 25. Figure 2A As shown, when viewed from the side of the straddle-type vehicle 1a, the cylindrical shell a2 is arranged behind the main pipe 22, above the bottom pipe 23, below the cross pipe 24 and in front of the tail pipe 25. The above arrangement facilitates disassembly and maintenance of the actuator 315a and the speed detector 5.

[0105] See also FIG. 7A to FIG. 10 , which are respectively a left side view of a straddle-type vehicle with a variable air intake mechanism, a left side view of an engine assembly, a right side view of a straddle-type vehicle, a right side view of an engine assembly, a partial exploded view of a straddle-type vehicle, and a top view of an engine assembly of the second embodiment of the utility model. The figure shows a straddle-type vehicle 1b with a variable air intake mechanism, which mainly includes: a frame 2b, an engine assembly 3b, an air intake system 4b, and a control unit 6. In this embodiment, the straddle-type vehicle 1b is a scooter, and the engine assembly 3b is a swinging engine that can swing and rotate relative to the frame 2b, but it is not limited to this. The engine assembly 3b can also be a fixed-locking engine that is fixed to the frame 2b.

[0106] like Figure 7B and Fig. 9As shown, the air intake system 4b used in the utility model is connected to the engine assembly 3b and has at least one air filter 40b. The air filter 40b includes an air intake box 41b, an air intake pipe 42b connected to the air intake box 41b, and a pipe length variable mechanism 43b. The pipe length variable mechanism 43b includes a mounting portion 431b, a driver 432b, a slide rail 433b, and an extension pipe 434b. The mounting portion 431b is disposed in the air intake box 41b. The driver 432b includes a driving member 4321b and a push rod 4322b connected to the driving member 4321b. The driving member 4321b is electrically connected to the control unit 6. The slide rail 433b and the driver 432b are arranged on the mounting portion 431b, and the growth tube 434b has a connection portion 4341b that can slide on the slide rail 433b. The connection portion 4341b is linked with the push rod 4322b of the driver 432b, and the connection portion 4341b can slide on the slide rail 433b under the driving force of the driver 432b, so as to connect or separate the growth tube 434b and the intake pipe 42b. Through the above design, the intake system 4b of the utility model can adjust the overall length of the intake pipe 42b by making the growth tube 434b selectively connect or separate with the intake pipe 42b, so as to simultaneously improve the power performance at high and low speeds and improve the engine fuel consumption level and maintain cost competitiveness. In addition, the configuration structure of the air intake system 4b of the utility model can reduce the demand for lateral space of the air intake box 41b, so as to facilitate configuration on models with smaller space, and can be modularly disassembled and assembled to facilitate maintenance convenience and system commonality.

[0107] Please also read Fig.11 , Fig. 12A and Fig. 12B , which are respectively a partial cross-sectional view of the cylinder head assembly of the second embodiment of the utility model, a schematic diagram of the oil circuit of the cylinder head assembly when the synchronous piston slides to the second position, and a schematic diagram of the oil circuit of the cylinder head assembly when the synchronous piston slides to the first position. As shown in the figure, the engine assembly 3b of this embodiment is arranged on the frame 2b, and the engine assembly 3b includes a cylinder head assembly 31b, a cylinder 32b and a crankcase 33b. Among them, the basic structure of the cylinder head assembly 31b of this embodiment is similar to that of the first embodiment, but the difference is that the first embodiment uses an electromagnetic device (actuator 315a) to drive the connecting mechanism 3144a to operate, so as to separate or connect the first rocker arm 3142a and the second rocker arm 3143a; in contrast, the second embodiment uses an oil circuit controller (actuator 315b) to drive the connecting mechanism 3144b to operate, so as to separate or connect the first rocker arm 3142b and the second rocker arm 3143b.

[0108] In this embodiment, the cylinder head 311b is provided with an oil supply passage 3111, a rocker oil passage 3112 and an oil return passage 3113, the first rocker arm 3142b is provided with a first piston hole h1, the second rocker arm 3143b is provided with a second piston hole h2, the connecting mechanism 3144b includes a synchronous piston b1, a stop piston b2 and a second return spring b3, the stop piston b2 slides in the second piston hole h2, the second return spring b3 presses against the stop piston b2 and the second rocker arm 3143b, the rocker oil passage 3112 is connected to the first piston hole h1, and the synchronous piston b1 can slide in the first piston hole h1 and the second piston hole h2 under the oil pressure of the rocker oil passage 3112 and the drive of the stop piston b2. The actuator 315b of this embodiment is an oil circuit controller, including an oil control valve housing b4, an oil control valve b5 and an electromagnetic unit b6. The oil control valve housing b4 has a chamber b40, and is provided with an oil inlet hole h3, an oil outlet hole h4 and an oil return hole h5. The oil control valve b5 is arranged in the chamber b40. The oil supply passage 3111 is connected to the oil control valve b5 via the oil inlet hole h3, the oil outlet hole h4 is connected to the connecting mechanism 3144b via the rocker arm oil passage 3112, and the oil return hole h5 is connected to the oil return passage 3113. Fig. 12A As shown, when the control unit 6 sends a first signal to control the electromagnetic unit b6 to drive the oil control valve b5 to connect the oil supply passage 3111 to the rocker arm oil passage 3112, the oil pressure of the oil supply passage 3111 is transmitted to the oil control valve b5 through the oil inlet hole h3, and then transmitted to the rocker arm oil passage 3112 through the oil outlet hole h4, and finally transmitted to the connecting mechanism 3144b by the rocker arm oil passage 3112, so as to connect the first rocker arm 3142b with the second rocker arm 3143b through the synchronous piston b1 of the connecting mechanism 3144b. Fig. 12B As shown, when the control unit 6 sends a first signal to control the electromagnetic unit b6 to drive the oil control valve b5 so that the oil supply channel 3111 is disconnected from the rocker arm oil channel 3112, the return oil pressure of the rocker arm oil channel 3112 flows back to the oil control valve b5 through the oil outlet hole h4, and then flows back to the accommodating space of the cylinder head 311b through the return oil hole h5 and the return oil channel 3113, causing the synchronous piston b1 of the connecting mechanism 3144b to separate the first rocker arm 3142b and the second rocker arm 3143b.

[0109] In addition, the control unit 6 is electrically connected to the actuator 315b and the driver 432b. The control unit 6 provides a first signal to control the actuator 315b, causing the synchronous piston b1 of the connecting mechanism 3144b to slide to the first position or the second position, thereby enabling the first rocker arm 3142b to selectively separate or connect with the second rocker arm 3143b. The control unit 6 provides a second signal to control the driver 432b, thereby enabling the growth pipe 434b to selectively connect or separate with the intake pipe 42b.

[0110] Through the above two designs, the above-mentioned straddle-type vehicle can be tuned to achieve (1) improved combustion efficiency: allowing the engine to adjust the valve timing and intake resonance according to different driving conditions, thereby improving combustion efficiency; (2) increased power and torque: an effective variable timing and intake system can optimize engine performance, improve the volumetric efficiency of the operating point, provide greater power and torque output, and have a wider range of performance usage areas; (3) reduced fuel consumption and emissions: through the improvement of volumetric efficiency to reduce brake specific fuel consumption (BSFC, Brake Specific Fuel Consumption), more efficient use of fuel, can reduce fuel consumption and reduce emissions; (4) improved engine performance: allowing the intake flow to be optimized at different speeds to improve engine performance; (5) balanced power and combustion efficiency: the variable timing and intake system helps to achieve better power balance and combustion efficiency under different driving conditions.

[0111] The above embodiments are merely examples for the convenience of explanation. The scope of rights claimed by the present utility model shall be based on the scope of protection required by the patent application documents, and is not limited to the above embodiments.

Claims

1. A straddle-type vehicle with a variable air intake mechanism, characterized in that: Included are: A frame; An engine assembly is arranged on the vehicle frame, the engine assembly includes a cylinder head assembly, a cylinder and a crankcase, the cylinder head assembly includes a cylinder head, a cylinder head cover, a camshaft, an intake rocker arm group and an actuator, wherein the cylinder head is combined with the cylinder, the cylinder is combined with the crankcase, the camshaft is pivoted on the cylinder head, the intake rocker arm group includes a rocker arm shaft, a first rocker arm, a second rocker arm and a connecting mechanism, the rocker arm shaft is supported on the cylinder head, the first rocker arm and the second rocker arm are pivoted on the rocker arm shaft, the first rocker arm and the second rocker arm are rotatable by the camshaft, and the connecting mechanism can slide between a first position and a second position along the direction of the rocker arm shaft to separate or connect the first rocker arm and the second rocker arm, the first position is to separate the first rocker arm and the second rocker arm, and the second position is to connect the first rocker arm and the second rocker arm; an intake system connected to the engine assembly, having at least one air filter, the air filter including an intake box, an intake pipe connected to the intake box, and a pipe length variable mechanism, the pipe length variable mechanism including a mounting portion, a driver, a slide rail, and an extension pipe, the mounting portion being disposed in the intake box, the slide rail and the driver being disposed on the mounting portion, the extension pipe having a connecting portion that can slide on the slide rail, the connecting portion being linked to the driver, and being driven by the driver so that the connecting portion can slide on the slide rail, so as to combine or separate the extension pipe and the intake pipe; and A control unit is electrically connected to the actuator and the driver, and the control unit provides a first signal to control the actuator, causing the connecting mechanism to slide to the first position or the second position, thereby allowing the first rocker arm to be selectively separated from or connected to the second rocker arm, and the control unit provides a second signal to control the driver, thereby allowing the growth pipe to be selectively combined with or separated from the intake pipe.

2. The straddle-type vehicle with a variable air intake mechanism according to claim 1, characterized in that: The driver comprises a driving member and a push rod connected to the driving member, the connecting portion is linked to the push rod, and the driving member is electrically connected to the control unit.

3. The straddle-type vehicle with a variable air intake mechanism according to claim 1, characterized in that: The cylinder head or the cylinder head cover is provided with a mounting seat surface and a mounting hole. The actuator is an electromagnetic device, including a flange, a cylindrical shell, a seat plate, a spindle, a coil and a plunger. The actuator passes through the mounting hole with the flange and is assembled on the mounting seat surface with the seat plate. The coil and the plunger are assembled in the cylindrical shell. The spindle passes through the cylindrical shell and is linked to the plunger. The connecting mechanism includes a push rod, a connecting pin and a first return spring. The first return spring provides a preload to urge the connecting pin to abut against the push rod. The push rod abuts between the spindle and the connecting pin. The connecting pin can slide between the first position and the second position under the driving force of the actuator and the thrust of the first return spring.

4. The straddle-type vehicle with a variable air intake mechanism as claimed in claim 3, characterized in that: The cylinder head cover is also provided with a rotation speed detector for detecting the rotation signal of the camshaft and connecting to the control unit.

5. The straddle-type vehicle with a variable air intake mechanism according to claim 4, characterized in that: The frame includes a head tube, a main tube, a bottom tube, a cross tube and a tail tube. When viewed from the side of the straddle-type vehicle, the cylindrical shell and the speed detector are arranged behind the main tube, above the bottom tube, below the cross tube and in front of the tail tube.

6. The straddle-type vehicle with a variable air intake mechanism as claimed in claim 5, characterized in that: The tail pipe is an ascending curved section.

7. The straddle-type vehicle with a variable air intake mechanism as claimed in claim 1, characterized in that: The cylinder head is provided with an oil supply passage, a rocker oil passage and an oil return passage. The first rocker arm is provided with a first piston hole, and the second rocker arm is provided with a second piston hole. The connecting mechanism includes a synchronous piston, a stop piston and a second return spring. The stop piston slides in the second piston hole, and the second return spring abuts against the stop piston and the second rocker arm. The rocker oil passage is connected to the first piston hole. The synchronous piston is driven by the oil pressure of the rocker oil passage and the stop piston to slide in the first piston hole and the second piston hole. The actuator is An oil circuit controller includes an oil control valve housing, an oil control valve and an electromagnetic unit. The oil control valve housing has a chamber and is provided with an oil inlet hole, an oil outlet hole and an oil return hole. The oil control valve group is arranged in the chamber. The oil supply passage is connected to the oil control valve via the oil inlet hole, the oil outlet hole is connected to the connecting mechanism via the rocker arm oil passage, and the oil return hole is connected to the oil return passage. The first signal controls the electromagnetic unit to drive the oil control valve to disconnect the oil supply passage or connect it to the rocker arm oil passage, thereby causing the synchronous piston to slide between the first position and the second position.

8. The straddle-type vehicle with a variable air intake mechanism as claimed in claim 1, characterized in that: The engine assembly can swing and rotate relative to the vehicle frame.

9. The straddle-type vehicle with a variable air intake mechanism as claimed in claim 1, characterized in that: The engine assembly is fixedly locked to the vehicle frame.

10. The straddle-type vehicle with a variable air intake mechanism according to claim 1, characterized in that: The straddle-type vehicle is a scooter-type motorcycle.

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