Arrangement structure of motorcycle

Abstract

The invention relates to a configuration structure of a motorcycle, the motorcycle comprises a power unit of a water-cooled internal combustion engine, and the power unit is supported on a frame unit; the power unit at least comprises a cylinder part and a crankcase arranged at one end of the cylinder part, the crankcase is provided with a crankshaft, a liquid cooling device is arranged on one side of the crankcase in parallel, and the liquid cooling device comprises a fan connected with the crankshaft and a radiator arranged on the outer side of the fan; from an overhead view, a vehicle width direction mounting area is defined between a cylinder center line of the cylinder part and the liquid cooling device, and a knock sensor is arranged in the vehicle width direction mounting area and is mounted on the cylinder part; therefore, the space between the liquid cooling device and the cylinder part which are arranged in the width direction of the motorcycle can be fully utilized to configure the knock sensor, so that the compact effect of peripheral configuration components of the power unit of the motorcycle can be improved.

Description

Technical Field

[0001] This invention relates to a motorcycle configuration, and more particularly to a motorcycle configuration that can make full use of the space between the liquid cooling device and the cylinder section located in the width direction of the motorcycle to configure the knock sensor, thereby improving the compactness of the components surrounding the power unit of the motorcycle. Background Technology

[0002] Motorcycles powered by internal combustion engines primarily generate power by the combustion of fuel within the engine cylinders, which pushes the pistons. This combustion can cause knocking, which can range from minor engine noise to severe damage to the pistons, cylinder walls or heads, and valves. Therefore, the installation and configuration of knock sensors around the motorcycle engine, and the use of the detected knock signals to enable the engine control unit (ECU) to take corresponding actions, has become a pressing issue for motorcycle manufacturers. Summary of the Invention

[0003] The problem that the invention aims to solve.

[0004] The main objective of this invention is to provide a configuration structure for a motorcycle that makes full use of the space between the liquid cooling device and the cylinder section in the width direction of the motorcycle to configure the knock sensor, thereby improving the compactness of the components surrounding the power unit of the motorcycle.

[0005] Technical means to solve the problem

[0006] Therefore, the present invention provides a configuration structure for a motorcycle, the motorcycle including a power unit with a water-cooled internal combustion engine, the power unit being supported on a frame unit; the power unit includes at least a cylinder head and a crankcase at one end of the cylinder head, the crankcase having a crankshaft, and a liquid cooling device arranged side-by-side on one side of the crankcase, the liquid cooling device including a fan connected to the crankshaft and a radiator disposed outside the fan; from a top view, a mounting area in the vehicle width direction is defined between the cylinder centerline of the cylinder head and the liquid cooling device, and a knock sensor is disposed in the mounting area in the vehicle width direction, the knock sensor being mounted on the cylinder head.

[0007] Therefore, the present invention provides a configuration for a motorcycle in which the knock sensor does not protrude beyond the outer edge of the fan in the vehicle width direction.

[0008] Therefore, the present invention provides a configuration structure for a motorcycle, wherein the cylinder section includes a cylinder head and a cylinder body, and a camshaft is provided in the cylinder head. From a top view, a front-rear mounting area is defined between the camshaft centerline of the camshaft and the crankshaft centerline of the crankshaft, and the knock sensor is provided in the front-rear mounting area.

[0009] Therefore, in some embodiments of the present invention, a configuration structure for a motorcycle is provided, wherein the cylinder section includes the cylinder head and the cylinder body; a timing chain chamber is provided on one side of the cylinder section, which connects the cylinder head, the cylinder body and the crankcase; and the knock sensor is mounted on the cylinder section on the opposite side of the timing chain chamber.

[0010] Therefore, in some embodiments of the present invention, a configuration is provided for a motorcycle in which the knock sensor is mounted on the cylinder body on the opposite side of the timing chain chamber.

[0011] Therefore, in some embodiments of the present invention, a configuration of a motorcycle is provided in which the cylinder body of the cylinder section is provided with a tensioner on the adjacent side of the timing chain chamber, and the knock sensor is mounted on the cylinder section and on the same side as the tensioner.

[0012] Therefore, in some embodiments of the present invention, a configuration structure for a motorcycle is provided, wherein an intake manifold and an igniter are mounted on the cylinder head; a timing chain chamber is provided on one side of the cylinder section, connecting the cylinder head, the cylinder body, and the crankcase; and the knock sensor is mounted on the cylinder body of the cylinder section on the same side or different side from the igniter.

[0013] Therefore, in some embodiments of the present invention, a configuration of a motorcycle is provided in which an intake pipe is mounted on the cylinder head; and the knock sensor is located on the same side as the intake pipe.

[0014] Therefore, in some embodiments of the present invention, a configuration of a motorcycle is provided, wherein an intake manifold and an igniter are mounted on the cylinder head; a timing chain chamber is provided on one side of the cylinder section, connecting the cylinder head, the cylinder body, and the crankcase; and the knock sensor is mounted on the crankcase.

[0015] Therefore, in some embodiments of the present invention, a configuration is provided for a motorcycle in which the knock sensor is on the same side or a different side of the ignition.

[0016] Therefore, in some embodiments of the present invention, a motorcycle configuration is provided, wherein the frame unit has at least a side frame portion; the knock sensor is located between two of the side frame portions; and, in a side view, the knock sensor does not overlap with the side frame portion.

[0017] Therefore, in some embodiments of the present invention, a motorcycle configuration is provided in which the side frame has an ascending section, and the knock sensor is located behind the ascending section when viewed from the side.

[0018] Therefore, in some embodiments of the present invention, a configuration of a motorcycle is provided in which the liquid cooling device has a radiator cover; viewed from the side, the knock sensor at least partially overlaps with the radiator cover.

[0019] Therefore, in some embodiments of the present invention, a configuration is provided for a motorcycle in which the knock sensor is mounted on the cylinder head.

[0020] Therefore, in some embodiments of the present invention, a motorcycle configuration is provided in which the frame unit is covered by a body cover unit, the body cover unit including at least a side body cover; and the knock sensor at least partially overlaps with the side body cover.

[0021] [The effects of the invention]

[0022] The advantages of this invention are: it can make full use of the space between the liquid cooling device and the cylinder section in the width direction of the motorcycle to install the knock sensor, thereby improving the compactness of the components around the power unit of the motorcycle.

[0023] The advantages of this invention are: by ensuring that the knock sensor does not protrude beyond the outer edge of the fan in the vehicle width direction, more space is available for installing the knock sensor, and sufficient maintenance space is provided for the knock sensor, thereby improving the ease of maintenance of the knock sensor.

[0024] The advantages of this invention are: by installing the knock sensor in the front-rear mounting area, the installation position of the knock sensor can be kept within the center line of the camshaft, thereby avoiding the problem of oversized cylinder head.

[0025] The advantages of this invention are: by installing the knock sensor on the cylinder section opposite the timing chain chamber, the sensing effect of the knock sensor can be improved, and the compactness of the components surrounding the power unit of the motorcycle can be improved.

[0026] The advantage of this invention is that the knock sensor is installed on the cylinder body on the opposite side of the timing chain chamber, thereby improving the sensing effect of the knock sensor.

[0027] The advantages of this invention are: the knock sensor is installed on the cylinder section and on the same side as the tensioner, thereby improving the sensing effect of the knock sensor, improving the compactness of the components around the power unit of the motorcycle, and improving the ease of installation of the knock sensor.

[0028] The advantages of this invention are: by placing the knock sensor on the same side as the air intake pipe, the sensing effect of the knock sensor can be improved, and the installation convenience of the knock sensor can be improved.

[0029] The advantages of this invention are: by mounting the knock sensor on the crankcase, the compactness of the components surrounding the power unit of the motorcycle can be improved, and the ease of installation of the knock sensor can be enhanced.

[0030] The advantages of this invention are as follows: by placing the knock sensor on the same side or a different side of the igniter, the routing and configuration of the knock sensor signal transmission line can be facilitated when the knock sensor is on the same side of the igniter; and when the knock sensor is on a different side of the igniter, interference with the signal transmission of the knock sensor can be avoided.

[0031] The advantage of this invention is that by positioning the knock sensor between the two side frame sections, the ease of installation of the knock sensor is improved.

[0032] The advantages of this invention are: by placing the knock sensor behind the rising section, the space behind the rising section can be fully utilized and interference with the rising section can be avoided.

[0033] The advantages of this invention are: by having at least a portion of the knock sensor overlap with the radiator cover, the outer side of the knock sensor can be shielded by the radiator cover, thereby preventing the knock sensor from being damaged by external objects and improving the performance of the knock sensor.

[0034] The advantages of this invention are: by having at least a portion of the knock sensor overlap with the side body cover, the outer side of the knock sensor can be shielded by the side body cover, thereby preventing the knock sensor from being damaged by external objects and improving the effectiveness of the knock sensor.

[0035] The advantages of this invention are: by mounting the knock sensor on the cylinder head, the compactness of the components surrounding the power unit of the motorcycle can be improved, and the ease of installation of the knock sensor can be enhanced. Attached Figure Description

[0036] Figure 1This is a side view of the motorcycle of the present invention.

[0037] Figure 2 This is a cross-sectional schematic diagram of the power unit of the present invention.

[0038] Figure 3 This is a cross-sectional schematic diagram of another type of power unit of the present invention.

[0039] Figure 4 This is an embodiment of the present invention where the knock sensor is installed on the cylinder body.

[0040] Figure 5 This is an embodiment of the present invention where the knock sensor is installed on the crankcase.

[0041] Figure 6 This is an embodiment of the present invention where the knock sensor is installed on the cylinder head.

[0042] Figure 7 This is a schematic diagram of the knock sensor and chassis unit configuration of the present invention.

[0043] Figure 8 This is a schematic diagram of the configuration of the knock sensor and liquid cooling device of the present invention.

[0044] List of reference numerals

[0045] 1: Motorcycle

[0046] 2: Chassis Unit

[0047] 21: Head tube section

[0048] 22: Steering mechanism

[0049] 23: Downcomer section

[0050] 24: Foot pedal section

[0051] 241: Foot pedal horizontal tube

[0052] 25: Side frame section

[0053] 251: Ascending segment 252: Extended segment

[0054] 253: Auxiliary pipe; 254: Extension piece

[0055] 3: Seat cushion

[0056] 4: Power Unit

[0057] 41: Cylinder section

[0058] 41a: Piston; 41b: Connecting rod

[0059] 411: Cylinder head cover

[0060] 412: Cylinder head; 4121: Camshaft

[0061] 413: Cylinder body; 414: Timing chain chamber

[0062] 415: Timing chain; 416: Tensioner

[0063] 417: Igniter; 418: Intake pipe

[0064] 42: Crankcase

[0065] 421: Crankshaft

[0066] 43: Continuously Variable Transmission (CVT)

[0067] 431: Final Axis

[0068] 44: Transmission Unit

[0069] 5: Liquid cooling device

[0070] 51: Fan

[0071] 511: Outer edge

[0072] 52: Radiator

[0073] 53: Radiator cover

[0074] 6: Body Cover Unit

[0075] 61: Hood 62: Front hood

[0076] 63: Covering the knees 64: Central body cover

[0077] 65: Side body cover

[0078] 7: Knock Sensor

[0079] D: Front fork unit

[0080] F: storage box

[0081] L: Camshaft centerline

[0082] L1: Cylinder centerline

[0083] L2: Crankshaft centerline

[0084] LA: Installation area

[0085] LA1: Installation area in the vehicle width direction

[0086] LA2: Rear-to-rear mounting area

[0087] M: Exhaust pipe

[0088] FW: Front wheel

[0089] RW: Rear wheel

[0090] P: Footrest

[0091] T: Fuel tank. Detailed Implementation

[0092] To better understand the structure and effects of this invention, the following description is provided in conjunction with the accompanying drawings.

[0093] First, please refer to Figure 1 As shown, the motorcycle 1 has a frame unit 2, a seat 3 disposed on the frame unit 2, and a power unit 4.

[0094] like Figure 1 As shown, in the following description of the present invention, left and right sides refer to the left side of the driver when the driver is riding on the motorcycle 1, and right side refers to the right side of the driver. The frame unit 2 has a head tube 21 pivotally mounted at the front. A steering mechanism 22 is connected above the head tube 21. A downpipe 23 is connected to the head tube 21 towards the rear of the vehicle body. A pair of slightly horizontal foot pedal tubes 24 extending towards the rear of the vehicle body are connected below the downpipe 23. A foot pedal cross tube 241 connects the end of the downpipe 23 to the pair of foot pedal tubes 24. A pair of side frame sections 25 extend from the foot pedal sections 24 towards the rear of the vehicle. The frame portion 25 has an ascending section 251 adjacent to the pedal tube portion 24 and an extension section 252 located at the rear of the vehicle body. A pair of auxiliary tubes 253 are provided between the ascending section 251 and the extension section 252 of the side frame portion 25, and a pair of extension members 254 extend from the ascending section 251 to the rear of the vehicle body. A front fork unit D composed of a front shock absorber is pivotally mounted below the head tube portion 21, and a front wheel FW is pivotally mounted at the lower end of the front fork unit D.

[0095] like Figure 1 As shown, the frame unit 2 has a slightly flat footrest P on its slightly horizontal foot tube section 24, which forms a flat footrest for the driver. The internal space defined between the two slightly horizontal foot tube sections 24 is equipped with a fuel tank T for storing fuel for the combustion of the power unit 4. The power unit 4 is connected to the frame unit 2 and is located further rearward of the fuel tank T.

[0096] like Figure 1 As shown, the side frame 25 has a seat cushion 3 for the driver to sit on above the extension 252, and a storage box F is provided on the extension 252 and below the seat cushion 3. The power unit 4 is locked to the auxiliary tube 253 and the extension member 254 of the side frame 25, and the power unit 4 is supported on the frame unit 2 in a non-swinging manner.

[0097] like Figure 1 , 2 As shown, the power unit 4 is a water-cooled internal combustion engine system. The power unit 4 includes a cylinder section 41, a crankcase 42 connected to one end of the cylinder section 41, a continuously variable transmission (CVT) 43 connected to one side of the crankcase 42, and a transmission section 44 connected to the CVT 43. The cylinder section 41 drives a piston 41a within it through the combustion of fuel. The piston 41a, via a connecting rod 41b, drives a crankshaft 421 located within the crankcase 42 to rotate. Simultaneously, the crankshaft 421 drives the CVT 43 located on the side of the crankcase 42, which in turn drives the transmission section 44. When the drive unit 44 is activated, the transmission unit 44 drives the rear wheel RW to rotate via a belt drive mechanism, thereby moving the motorcycle 1. The cylinder section 41 of the power unit 4 is provided with an exhaust pipe M for discharging exhaust gases after fuel combustion. The exhaust pipe M extends from the outside of the power unit 4 towards the rear of the vehicle body. On the opposite side of the exhaust pipe M is a liquid cooling device 5 that provides coolant to cool the cylinder section 41. The liquid cooling device 5 and the continuously variable transmission (CVT) system 43 are respectively located on different sides of the motorcycle 1. For example, if the liquid cooling device 5 is located on the left side of the motorcycle 1, then the CVT system 43 is located on the right side of the motorcycle 1 (e.g., if the liquid cooling device 5 is located on the left side of the motorcycle 1, then the CVT system 43 is located on the right side of the motorcycle 1). Figure 2 (as shown); conversely, if the liquid cooling device 5 is located on the right side of the motorcycle 1, then the continuously variable transmission system 43 is located on the left side of the motorcycle 1 (as shown). Figure 3 (As shown).

[0098] like Figure 3 As shown, the power unit 4 does not require the transmission section 44; the power unit 4 only has a cylinder section 41, a crankcase 42 connected to one end of the cylinder section 41, and a continuously variable transmission (CVT) system 43 connected to one side of the crankcase 42; the cylinder section 41 drives the piston 41a located in the cylinder section 41 by the combustion of fuel, and the piston 41a drives the crankshaft 421 located in the crankcase 42 to rotate by the connecting rod 41b. The crankshaft 421 simultaneously drives the CVT system 43 located on the side of the crankcase 42 to operate. The CVT system 43 can drive the rear wheel RW located on the final shaft 431 to rotate, thereby making the motorcycle 1 move.

[0099] like Figure 1 , 2As shown in Figures 3 and 7, the cylinder section 41 extends forward of the vehicle body at a slightly inclined angle and partially extends beyond the rising section 251 of the side frame section 25, meaning that the portion of the cylinder section 41 extending forward of the vehicle body extends further forward than the rising section 251 of the side frame section 25. The cylinder section 41, from the front of the vehicle body to the rear, sequentially includes a cylinder head cover 411, a cylinder head 412, and a cylinder body 413. One end of the cylinder body 413 facing the rear of the vehicle body is connected to the crankcase 42. The cylinder head 412 is connected to the other end of the cylinder body 413 away from the crankcase 42. The cylinder head cover 411 covers the other end of the cylinder head 412 away from the end connected to the cylinder body 413. A timing chain chamber 414 is provided on one side of cylinder head 412, cylinder body 413, and crankcase 42. A timing chain 415 is provided in the timing chain chamber 414. One end of the timing chain 415 is connected to the camshaft 4121 located in the cylinder head 412, and the other end is connected to the crankshaft 421 in the crankcase 42. A tensioner 416 for tensioning the timing chain 415 is provided on the adjacent side of the timing chain chamber 414 of cylinder body 413. An igniter 417 for igniting fuel is installed in cylinder head 412. An intake pipe 418 for providing filtered fresh air required for combustion is provided in cylinder head 412. The intake pipe 418 is located on the same side of cylinder section 41 as the tensioner 416.

[0100] like Figure 1 As shown, the motorcycle 1 has a body cover unit 6 covering the outer periphery of the frame unit 2. The body cover unit 6 has a front cover 61 covering the steering mechanism 22, a front body cover 62 covering the front of the head tube 21, a knee cover 63 covering the rear of the head tube 21, a central body cover 64 located below the seat 3, and side body covers 65 covering the two sides of the motorcycle 1 and located below the two sides of the seat 3.

[0101] like Figure 1 , 2 As shown in Figure 3, the liquid cooling device 5 is located on one side of the motorcycle body in the width direction. More specifically, the liquid cooling device 5 is located on one side of the crankcase 42; that is, the liquid cooling device 5 is located on the other side of the continuously variable transmission system 43 of the power unit 4. The liquid cooling device 5 includes a fan 51 connected to the crankshaft 421 and a radiator 52 located outside the fan 51; furthermore, the radiator 52 is covered with a radiator cover 53.

[0102] like Figure 1 , 2As shown in Figures 3, 7, and 8, the center of the camshaft 4121 within the cylinder head 412 of the cylinder section 41, along the width direction of the motorcycle 1, is defined by this invention as the camshaft centerline L. The cylinder section 41, along the longitudinal direction of the motorcycle 1, through the center of the connecting rod 41b, is defined by this invention as the cylinder centerline L1. The crankshaft 421, along the width direction of the motorcycle 1, is defined by this invention as the crankshaft centerline L2. The area formed by the camshaft centerline L, the cylinder centerline L1, the crankshaft centerline L2, and the liquid cooling device 5 towards the center of the vehicle body is defined by this invention as the mounting area LA. A knock sensor 7 is mounted on the cylinder section 41 in the mounting area LA. Furthermore, this invention further divides the mounting area LA into: a width-direction mounting area LA1 between the cylinder centerline L1 and the liquid cooling device 5; and a longitudinal-direction mounting area LA2 between the camshaft centerline L and the crankshaft centerline L2; and the area defined by the motorcycle 1 body. Viewed from above, the knock sensor 7 is located between the side frame portions 25, and further rearward of the rising section 251 towards the vehicle body; viewed from the side of the motorcycle 1, the knock sensor 7 is located further rearward of the rising section 251 towards the vehicle body, meaning the knock sensor 7 does not overlap with the side frame portion 25; viewed from the side of the motorcycle 1, the knock sensor 7 is located where it at least partially overlaps with the radiator cover 53 of the liquid cooling device 5; viewed from the side of the motorcycle 1, the knock sensor 7 is located where it at least partially overlaps with the radiator cover 53 of the liquid cooling device 5; When viewed from the side, the knock sensor 7 overlaps at least partially with the side body cover 65 of the body cover unit 6. When viewed from above, the knock sensor 7 does not protrude beyond the outer edge 511 of the fan 51 of the liquid cooling device 5 in the vehicle width direction, thereby providing more space for the installation of the knock sensor 7 and sufficient maintenance space for the knock sensor 7, thus improving the maintenance convenience of the knock sensor 7.

[0103] like Figure 2 , 3 As shown, in one specific embodiment of the present invention, the knock sensor 7 is installed on the cylinder body 413 of the cylinder section 41 located on the opposite side of the timing chain chamber 414 within the mounting area LA, on the same side or different side from the igniter 417; or the knock sensor 7 is installed on the cylinder body 413 of the cylinder section 41 located on the same side of the timing chain chamber 414 within the mounting area LA (e.g., Figure 3 (As shown).

[0104] like Figure 4 As shown in the second embodiment of the present invention, the knock sensor 7 is installed on the same side of the cylinder body 413 where the tensioner 416 is located in the installation area LA, which is located in the cylinder section 41. That is, the knock sensor 7 is installed on the same side as the intake pipe 418, and on the same side or different side as the igniter 417.

[0105] like Figure 5 As shown in the third embodiment of the present invention, the knock sensor 7 is installed in the mounting area LA on the crankcase 42, on the same side or different side as the igniter 417.

[0106] like Figure 6 As shown in the fourth embodiment of the present invention, the knock sensor 7 is installed on the cylinder head 412 of the mounting area LA, and is located on the same side as the intake pipe 418, and on the same side or different side as the igniter 417.

[0107] The present invention mainly utilizes the fact that the motorcycle 1 includes a power unit 4 with a water-cooled internal combustion engine, which is supported by a frame unit 2; the power unit 4 includes at least a cylinder section 41 and a crankcase 42 at one end of the cylinder section 41, the crankcase 42 is provided with a crankshaft 421, and a liquid cooling device 5 is arranged side by side on one side of the crankcase 42, the liquid cooling device 5 including a fan 51 connected to the crankshaft 421 and a radiator 52 disposed outside the fan 51; from a top view Viewed from the side, the cylinder centerline L1 of the cylinder section 41 and the liquid cooling device 5 define a mounting area LA1 in the vehicle width direction. A knock sensor 7 is installed in the mounting area LA1 in the vehicle width direction and is mounted on the cylinder section 41. In this way, the space between the liquid cooling device 5 and the cylinder section 41 in the vehicle width direction of the motorcycle 1 can be fully utilized to arrange the knock sensor 7, thereby improving the compactness of the components around the power unit 4 of the motorcycle 1.

[0108] Another key feature of this invention is that the cylinder section 41 includes a cylinder head 412 and a cylinder body 413. The cylinder head 412 is provided with a camshaft 4121. From a top view, the camshaft centerline L of the camshaft 4121 and the crankshaft centerline L2 of the crankshaft 421 define a front-rear mounting area LA2. The knock sensor 7 is installed in the front-rear mounting area LA2. This avoids the problem of the knock sensor 7 not being installed beyond the camshaft centerline L, thus preventing the cylinder head 412 from becoming too large.

[0109] In summary, the present invention, through the above-described structure, can improve upon known shortcomings and achieve the claimed objectives, and has indeed improved upon existing technologies, thus possessing novelty, practicality, and inventiveness.

Claims

1. A configuration structure for a motorcycle, characterized in that, The motorcycle includes a power unit with a water-cooled internal combustion engine, the power unit being supported by a frame unit; the power unit includes at least a cylinder head and a crankcase at one end of the cylinder head, the crankcase having a crankshaft, and a liquid cooling device arranged side-by-side on one side of the crankcase, the liquid cooling device including a fan connected to the crankshaft and a radiator disposed outside the fan; from a top view, a width-direction mounting area is defined between the cylinder centerline of the cylinder head and the liquid cooling device, and a knock sensor is disposed within the width-direction mounting area, the knock sensor being mounted on the cylinder head.

2. The configuration of the motorcycle according to claim 1, characterized in that, The knock sensor does not protrude beyond the outer edge of the fan in the vehicle width direction.

3. The configuration of the motorcycle according to claim 1, characterized in that, The cylinder section includes a cylinder head and a cylinder body. A camshaft is provided inside the cylinder head. From a top view, the camshaft centerline and the crankshaft centerline define a front-to-back mounting area. The knock sensor is installed in the front-to-back mounting area.

4. The configuration of the motorcycle according to claim 1 or 3, characterized in that, The cylinder section includes the cylinder head and the cylinder body; a timing chain chamber is provided on one side of the cylinder section, connecting the cylinder head, the cylinder body and the crankcase; the knock sensor is installed on the cylinder section on the opposite side of the timing chain chamber.

5. The configuration of the motorcycle according to claim 4, characterized in that, The knock sensor is installed on the cylinder body on the opposite side of the timing chain chamber.

6. The configuration of the motorcycle according to claim 4, characterized in that, The cylinder body of the cylinder section is provided with a tensioner on the adjacent side of the timing chain chamber, and the knock sensor is installed on the cylinder section and on the same side as the tensioner.

7. The configuration of the motorcycle according to claim 1, characterized in that, The cylinder section includes a cylinder head and a cylinder body; an intake manifold and an igniter are installed on the cylinder head; a timing chain chamber connecting the cylinder head, the cylinder body, and the crankcase is provided on one side of the cylinder section; the knock sensor is installed on the cylinder body of the cylinder section, on the same side or different side from the igniter.

8. The configuration of the motorcycle according to claim 4, characterized in that, An intake pipe is installed on the cylinder head; the knock sensor is on the same side as the intake pipe.

9. The configuration of the motorcycle according to claim 4, characterized in that, An intake manifold and an igniter are mounted on the cylinder head; a timing chain chamber connecting the cylinder head, cylinder body, and crankcase is provided on one side of the cylinder section; and a knock sensor is mounted on the crankcase.

10. The configuration of the motorcycle according to claim 9, characterized in that, The knock sensor may be on the same side or a different side of the igniter.

11. The configuration of the motorcycle according to claim 1, characterized in that, The frame unit has at least a side frame portion; the knock sensor is located between two of the side frame portions; from a side view, the knock sensor does not overlap with the side frame portion.

12. The configuration of the motorcycle according to claim 11, characterized in that, The side frame has an ascending section, and the knock sensor is located behind the ascending section when viewed from the side.

13. The configuration of the motorcycle according to claim 1, characterized in that, The liquid cooling device has a radiator cover; viewed from the side, the knock sensor overlaps at least partially with the radiator cover.

14. The configuration of the motorcycle according to claim 3, characterized in that, The knock sensor is mounted on the cylinder head.

15. The configuration of the motorcycle according to claim 1, characterized in that, The frame unit is covered by a body cover unit, which includes at least a side body cover; the knock sensor has at least a portion overlapping the side body cover.

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