Engine and motorcycle using the same

Abstract

This invention provides an engine and a motorcycle using the engine. The engine includes a crankcase and a cylinder block. The crankcase and cylinder block are fixedly connected. A crankshaft is rotatably connected within the crankcase, and a camshaft is rotatably connected within the cylinder block. A timing chain is driven between the crankshaft and the camshaft. A mounting cavity is provided within the cylinder block, and at least part of the timing chain is located within the mounting cavity. A balance shaft is mounted within the mounting cavity, and a balance weight is connected to the balance shaft. A balance transmission assembly is driven between the camshaft and the balance weight, and the camshaft drives the balance weight to rotate around the axis of the balance shaft via the balance transmission assembly. By placing the balance shaft and balance weight in the mounting cavity within the cylinder block, this application avoids the balance weight agitating the oil accumulated in the crankcase.

Description

Technical Field

[0001] This invention relates to the technical field of motorcycle engines, and more specifically to engines and motorcycles using the same engines. Background Technology

[0002] Motorcycle engines produce vibrations during operation. The main measure to improve the vibration problem is to install a balance shaft inside the engine that is connected to the crankshaft drive. A balance weight is fixed on the balance shaft, and the rotation of the balance weight can offset at least part of the vibration.

[0003] In related technologies, the crankshaft is installed inside the crankcase of the engine, and the balance shaft and balance weights are also located inside the crankcase, primarily near the crankshaft. The balance shaft is directly connected to the crankshaft. During rotation, the balance weights may be agitated by the engine oil at the bottom of the crankcase, thus affecting their balancing function. Summary of the Invention

[0004] The purpose of this invention is to provide an engine and a motorcycle using the engine, wherein the balance weights do not agitate the oil at the bottom of the crankcase.

[0005] To address the aforementioned technical problems, a first aspect of this embodiment provides an engine.

[0006] The engine includes a crankcase and a cylinder block. The crankcase and cylinder block are fixedly connected. A crankshaft is rotatably connected inside the crankcase. A camshaft is rotatably connected inside the cylinder block. A timing chain is driven between the crankshaft and the camshaft. A mounting cavity is provided inside the cylinder block, and at least part of the timing chain is located in the mounting cavity. A balance shaft is installed in the mounting cavity, and a balance weight is connected to the balance shaft. A balance transmission assembly is driven between the camshaft and the balance weight. The camshaft drives the balance weight to rotate around the axis of the balance shaft through the balance transmission assembly.

[0007] Furthermore, the plane passing through both the axis of the camshaft and the axis of the crankshaft is defined as the first reference plane, and the angle between the first reference plane and any horizontal plane ranges from 0° to 40°.

[0008] Furthermore, the angle between the first reference plane and any horizontal plane ranges from 2° to 30°.

[0009] Furthermore, the angle between the first reference plane and any horizontal plane ranges from 4° to 21°.

[0010] Furthermore, the plane passing through both the axis of the camshaft and the axis of the balance shaft is defined as the second reference plane; the angle between the first reference plane and the second reference plane ranges from 0° to 10°; and the axis of the balance shaft is located above the first reference plane.

[0011] Furthermore, the plane passing through both the axis of the camshaft and the axis of the crankshaft is defined as the first reference plane, and the angle between the first reference plane and any horizontal plane ranges from 79° to 90°.

[0012] Furthermore, the balance transmission assembly includes a driving element and a driven element. The driving element is fixedly connected to the camshaft and is connected to the driven element in a transmission manner. The driven element is connected to the balance block and can drive the balance block to rotate around the axis of the balance shaft. A balance bearing is connected between the balance shaft and the driven element.

[0013] Furthermore, the balance shaft has an oil chamber connected to the balance bearing; the cylinder body has an oil passage connected to the oil chamber.

[0014] Furthermore, the timing chain and balance weights are located on both sides of the balance drive assembly along the axial direction of the camshaft.

[0015] To address the aforementioned technical problems, a second aspect of this embodiment provides a motorcycle.

[0016] The motorcycle includes a frame, body panels, and a running gear, with the body panels at least partially covering the frame; the running gear is at least partially connected to the frame; the motorcycle also includes a powertrain, which includes a transmission and an engine as described in any of the above embodiments, the engine being supported by the frame and driven through the transmission, the transmission being driven through the running gear.

[0017] Furthermore, the motorcycle is a two-wheeled scooter, and its engine displacement is less than 200cc.

[0018] This application, by placing the balance shaft and balance weights in a mounting cavity within the cylinder block, allows the balance weights to be located away from the bottom of the crankcase, thus preventing them from agitating the oil accumulated in the crankcase. Furthermore, since the timing chain is also at least partially located within the mounting cavity, the balance weights can disperse dripping oil into an oil mist during high-speed rotation, which lubricates the timing chain. Additionally, since the cylinder block already requires a mounting cavity to accommodate components such as the timing chain, placing the balance shaft and balance weights within this cavity makes full use of space. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the motorcycle provided in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the engine and transmission of the powertrain of the motorcycle provided in the embodiments of this application;

[0022] Figure 3 yes Figure 2 A partial structural diagram of the engine;

[0023] Figure 4 yes Figure 3 A schematic diagram illustrating the first possible positional relationship between the crankshaft, camshaft, and balance shaft;

[0024] Figure 5 yes Figure 3 A schematic diagram illustrating the second possible positional relationship between the crankshaft, camshaft, and balance shaft;

[0025] Figure 6 yes Figure 3 A schematic diagram of the third positional relationship between the crankshaft, camshaft, and balance shaft. Detailed Implementation

[0026] Various aspects and features of the present invention are described herein with reference to the accompanying drawings.

[0027] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as examples of embodiments. Other modifications within the scope and spirit of the invention will be apparent to those skilled in the art.

[0028] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the invention and, together with the general description of the invention given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.

[0029] These and other features of the invention will become apparent from the following description, with reference to the accompanying drawings, of preferred forms of embodiments given as non-limiting examples.

[0030] It should also be understood that although the invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the invention, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0031] The above and other aspects, features and advantages of the invention will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0032] Specific embodiments of the invention will now be described with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the invention, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the invention. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the invention in various ways with substantially any suitable detailed structure.

[0033] This specification may use the phrases “in some embodiments,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments of the present invention.

[0034] This invention provides a motorcycle, which can be a two-wheeled motorcycle, and more particularly a two-wheeled scooter. The two-wheeled scooter is generally a small-displacement motorcycle, meaning it has an engine displacement of less than 200cc, and more particularly, a displacement of 100cc-150cc.

[0035] Figure 1 This embodiment shows a motorcycle 100 to which this embodiment applies. The motorcycle 100 includes a frame 11, a body panel 12, a suspension system 13, a running gear 14, a riding mechanism 15, and a powertrain 200.

[0036] To clearly illustrate the technical solution of this application, the following are also defined: Figure 1 The directions shown are front, rear, left, right, top, and bottom. In this application, the length direction of the motorcycle frame 11 refers to... Figure 1 In the fore-and-aft direction, the width direction of the frame 11 of the motorcycle 100 refers to... Figure 1 In the left-right direction, the height direction of the frame 11 of the motorcycle 100 refers to... Figure 1 The vertical direction is defined in this embodiment. Specifically, the front, back, left, right, up, and down directions are based on the motorcycle 100 traveling on a level road surface, not on a sloping road surface.

[0037] The body panel 12 at least partially covers the frame 11. The suspension system 13 is connected to the frame 11 and serves to connect the running gear 14 to the frame 11, providing shock absorption for the motorcycle 100 during operation. The running gear 14 is at least partially located under the frame 11. The powertrain 200 is supported by the frame 11 and driven through the running gear 14 to drive the entire vehicle. The riding mechanism 15 is connected to the frame 11 and provides support for the driver and / or passenger.

[0038] The running gear 14 includes a front wheel 141 and a rear wheel 142. The suspension system 13 includes a front suspension damper 131 and a rear suspension damper 132. The front wheel 141 is connected to the frame 11 via the front suspension damper 131, and the rear wheel 142 is connected to the frame 11 via the rear suspension damper 132. The seating mechanism 15 includes a seat cushion 151 and a seat bucket 152. The seat cushion 151 is located above the seat bucket 152 and is fixedly connected to the frame 11. The driver and / or passenger sit on the seat cushion 151, and items can be stored in the seat bucket 152.

[0039] like Figure 2 and Figure 3 As shown, in this embodiment, the powertrain 200 of the motorcycle 100 includes an engine 21 and a transmission 22 connected by transmission. The engine 21 includes a crankcase 211 and a cylinder block 212, which are fixedly connected. A crankshaft 213 is rotatably connected inside the crankcase 211, and a camshaft 215 is rotatably connected inside the cylinder block 212. A timing chain 216 is connected between the crankshaft 213 and the camshaft 215. A piston cylinder 214 is fixed inside the cylinder block 212, and a piston 2141 is slidably disposed inside the piston cylinder 214. A connecting rod 2142 is connected between the piston 2141 and the crankshaft 213. During the reciprocating motion of the piston 2141 inside the piston cylinder 214, it can drive the crankshaft 213 to rotate around its own axis, and drive the camshaft 215 to rotate around its own axis through the timing chain 216. Specifically, the cylinder block 212 includes a cylinder block portion 2121 and a cylinder head portion 2122. The camshaft 215 can be located in the cylinder block portion 2121 or in the cylinder block portion 2121 according to actual layout requirements.

[0040] The transmission 22 includes a drive pulley 221, a driven pulley 222, and a transmission component 223. The drive pulley 221 is connected to one end of the crankshaft 213. Optionally, the drive pulley 221 is fixed to the end of the crankshaft 213. The drive pulley 221 and the driven pulley 222 transmit kinetic energy through the transmission component 223, which can be a belt or steel belt connected end to end. Specifically, the drive pulley 221 includes a main fixed plate 2211 and a main movable plate 2212. The main fixed plate 2211 is fixed along the axial direction of the crankshaft 213, and the main movable plate 2212 can move along the axial direction of the crankshaft 213, and move closer to or further away from the main fixed plate 2211 along the axial direction of the crankshaft 213. The transmission 22 also includes a drive component 224, which can drive the main movable plate 2212 to move. Driven wheel 222 includes a fixed disk 2221 and a movable disk 2222. The fixed disk 2221 is fixed along the axial direction of crankshaft 213, and the movable disk 2222 is movable along the axial direction of crankshaft 213, moving closer to or further away from the fixed disk 2221. The portion of transmission member 223 near the driving wheel 221 is sandwiched between the main fixed disk 2211 and the main movable disk 2212, and the portion of transmission member 223 near the driven wheel 222 is sandwiched between the fixed disk 2221 and the movable disk 2222.

[0041] A mounting cavity 2123 is provided within the cylinder block 212, and the timing chain 216 is at least partially located within the mounting cavity 2123. Specifically, a receiving cavity 2111 is provided within the crankcase 211, and the mounting cavity 2123 communicates with the receiving cavity 2111. The mounting cavity 2123 and a portion of the receiving cavity 2111 together form the timing chain cavity, within which the timing chain 216 moves. A balance shaft 217 is installed within the mounting cavity 2123, and a balance weight 2171 is connected to the balance shaft 217. A balance transmission assembly 218 is connected between the camshaft 215 and the balance weight 2171, and the camshaft 215 drives the balance weight 2171 to rotate around the axis of the balance shaft 217 via the balance transmission assembly 218.

[0042] It is worth noting that by placing the balance shaft 217 and balance weight 2171 in the mounting cavity 2123 near the timing chain 216, the mounting space for the balance shaft 217 and balance weight 2171 within the engine 21 is optimized. Specifically, since the timing chain cavity already exists, this embodiment moves the balance shaft 217 and balance weight 2171 into the timing chain cavity, thus saving or freeing up the mounting space that was originally required for the balance shaft 217 and balance weight 2171 in the crankcase 211, allowing for the installation of other components. Furthermore, the volume of the space added for arranging the balance shaft 217 and balance weight 2171 in this embodiment is smaller than the volume of the saved space. Therefore, the above arrangement optimizes the mounting space within the engine 21.

[0043] Secondly, it also provides better lubrication for the timing chain 216. Specifically, some engine oil drips from the top of the timing chain cavity, and during the high-speed rotation of the balance weight 2171, some of the engine oil can be dispersed into oil mist, thereby increasing the oil mist concentration in the timing chain cavity and providing better lubrication for the timing chain 216.

[0044] Furthermore, it also solves the problem of the balance weight 2171 stirring the oil within the crankcase 211. Specifically, oil usually accumulates at the bottom of the crankcase 211. In some cases, the oil level may exceed the lowest point of rotation of the balance weight 2171, causing the balance weight 2171 to stir the oil during rotation, affecting balance. By placing the balance shaft 217 and the balance weight 2171 within the mounting cavity 2123, the problem of the balance weight 2171 stirring the oil within the crankcase 211 is eliminated.

[0045] In some embodiments, the balance transmission assembly 218 includes a driving member 2181 and a driven member 2182. The driving member 2181 is fixedly connected to the camshaft 215 and is drively connected to the driven member 2182. The driven member 2182 is connected to the balance block 2171 and can drive the balance block 2171 to rotate around the axis of the balance shaft 217. A balance bearing 2183 is connected between the balance shaft 217 and the driven member 2182. The balance bearing 2183 may be a needle roller. Specifically, the balance shaft 217 is connected to the mounting cavity 2123 by an interference fit or a clearance fit, preferably an interference fit. The driving element 2181 is a gear, and the driven element 2182 has driven teeth 2182a on its outer peripheral wall. The driven teeth 2182a mesh with the driving element 2181. One end of the driven element 2182 has an extension 2182b, which has a sleeve-like structure. The balance block 2171 is interference-fitted onto the outer periphery of the extension 2182b. The balance transmission assembly 218 also includes two washers 2184, which are located at both ends of the driven element 2182 along the axial direction of the balance shaft 217. The washers 2184 are fitted onto the outer periphery of the balance shaft 217 and abut against the cavity wall of the driven element 2182 and the mounting cavity 2123, thereby reducing wear on the cavity wall of the mounting cavity 2123. Understandably, the bearing structure is composed of needle rollers, follower 2182, and balance shaft 217. The needle rollers directly contact the inner wall of follower 2182 and the outer wall of balance shaft 217, saving the outer and inner ring structures of the bearing. This simplifies the connection structure between balance shaft 217 and follower 2182, reduces costs, and facilitates the supply of lubricating oil or grease to the needle rollers.

[0046] In some alternative embodiments (not shown), a bearing is connected between the balance shaft 217 and the mounting cavity 2123. The balance shaft 217 and the balance block 2171 are interference-fitted. The driven member 2182 is also interference-fitted with the balance shaft 217. The driven member 2182 is connected to the driving member 2181 via a drive mechanism. In some alternative embodiments (not shown), the driving member 2181 is a geared disc or sprocket. The outer periphery of the driven member 2182 is provided with driven teeth 2182a or chain teeth. The driving member 2181 and the driven member 2182 are driven by a belt or chain.

[0047] In some embodiments, the timing chain 216 and the balance block 2171 are located on both sides of the balance transmission assembly 218 along the axial direction of the camshaft 215. This arrangement allows the balance block 2171 to be as far away from the timing chain 216 as possible, thereby reducing the interference of the balance block 2171 on the timing chain 216 during rotation.

[0048] In some embodiments, the balance shaft 217 has an oil chamber 2172, which is connected to the balance bearing 2183. The cylinder block 212 has an oil passage (not shown), and the oil chamber 2172 is connected to the oil passage. Specifically, the oil chamber 2172 has an oil outlet channel 2172a and an oil inlet channel 2172b. The oil outlet channel 2172a is connected to the balance bearing 2183, allowing lubricating oil or grease in the oil chamber 2172 to reach the balance bearing 2183 through the oil outlet channel 2172a. Especially when the balance bearing 2183 is a needle roller bearing, the lubricating oil or grease can more easily reach the gaps between the needle rollers. The oil chamber 2172 is connected to the oil passage in the cylinder block 212 through the oil inlet channel 2172b.

[0049] It is worth noting that by setting up a lubrication supply structure specifically for the balance bearing 2183, the lubrication problem of the balance bearing 2183 can be alleviated. Specifically, the amount of oil stored in the crankcase 211 is more than the amount of oil in the timing chain chamber, and the amount of oil splashed out from the crankcase 211 is also more than the amount of oil splashed out from the timing chain chamber. Therefore, in this embodiment, after moving the balance shaft 217 and the balance weight 2171 to the timing chain chamber, the problem of insufficient oil supply to the balance bearing 2183 will inevitably occur. Therefore, the setting of structures such as the oil chamber 2172 can improve the problem of insufficient lubrication.

[0050] In some embodiments, the cylinder body 212 has a mounting hole 2124 on its surface, which is connected to the mounting cavity 2123. A sealing ring 2173 is fitted on the outer peripheral wall of the balance shaft 217, and the outer peripheral wall of the sealing ring 2173 abuts against the wall of the mounting hole 2124. A retaining ring 2174 is embedded in the wall of the mounting hole 2124, and the end of the balance shaft 217 abuts against the retaining ring 2174. The retaining ring 2174 is used to prevent the balance shaft 217 from dislodging out of the mounting hole 2124.

[0051] like Figure 3 and Figure 4 As shown, in this embodiment, the plane passing through both the axis of the camshaft 215 and the axis of the crankshaft 213 is defined as the first reference plane 101, and the plane passing through both the axis of the camshaft 215 and the axis of the balance shaft 217 is defined as the second reference plane 102.

[0052] In some embodiments, the engine 21 is horizontally or obliquely positioned, meaning the angle α1 between the first reference plane 101 and any horizontal plane ranges from 0° to 40°. Angle α1 can be interpreted as the angle between the line connecting the axes of the camshaft 215 and the crankshaft 213, viewed from a side angle, and any horizontal line. Further, angle α1 ranges from 2° to 30°, and even further, from 4° to 21°. Specifically, angle α1 can be selected as 5°, 9°, 12°, 15°, 19°, or 20°. It is worth noting that when angle α1 is not 0°, the axis of the camshaft 215 can be obliquely above or below the axis of the crankshaft 213, preferably obliquely above. This configuration optimizes the entire powertrain 200 (see...). Figure 2 The spatial arrangement within the vehicle reduces the vertical space occupied by the powertrain 200, freeing up more space for the under-seat storage compartment 152 (see...). Figure 1 ) and other components. Furthermore, with the inclusion of components such as the balance shaft 217 and balance weight 2171, the vibration of the entire vehicle can be effectively controlled. In a further embodiment (see... Figure 4 The axis of the balance shaft 217 is located within the first reference plane 101, meaning the angle β between the first reference plane 101 and the second reference plane 102 is 0°. This arrangement prevents the balance block 2171 from getting too close to the timing chain 216 in the direction perpendicular to the first reference plane 101, thus reducing interference from the balance block 2171 to the timing chain 216. In another further embodiment (see...) Figure 5The axis of the balance shaft 217 is located above the first reference surface 101, meaning the angle β between the first reference surface 101 and the second reference surface 102 is not 0°. Angle β can be interpreted as the angle between the line connecting the axis of the balance shaft 217 and the axis of the camshaft 215, and the line connecting the axis of the camshaft 215 and the axis of the crankshaft 213, when viewed from a side angle. This arrangement prevents the balance block 2171 from agitating the small amount of oil at the bottom of the mounting cavity 2123 during rotation. The angle β ranges from 0° to 10° (excluding 0°), further from 2° to 8°, and even further from 4° to 7°. Specifically, the angle β can be selected as 4.3°, 4.7°, 5.2°, 5.6°, 6.1°, 6.5°, or 6.8°. In an alternative embodiment, when the included angle β is not 0°, the axis of the balance shaft 217 may also be located below the first reference plane 101.

[0053] like Figure 3 and Figure 5 As shown, in some embodiments, the engine 21 is vertical, meaning the angle α2 between the first reference plane 101 and any horizontal plane ranges from 79° to 90°. Angle α2 can be interpreted as the angle between the line connecting the axes of the camshaft 215 and the crankshaft 213, viewed from a side angle, and any horizontal line. Further, the angle α2 ranges from 81° to 88°, and even further, from 83° to 86°. Specifically, the angle α2 can be selected as 83.5°, 84°, 84.5°, 85°, or 85.5°. It is worth noting that in the current embodiment, see... Figure 6 In the vertical engine 21, the camshaft 215 is located above the crankshaft 213. When the oil near the camshaft 215 flows to the timing chain chamber, it can drip from top to bottom. The amount of dripping oil is relatively large. Some of the oil can be dispersed into oil mist by the balance block 2171, which can better help lubricate the timing chain 216.

[0054] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An engine comprising a crankcase and a cylinder block, the crankcase being fixedly connected to the cylinder block, a crankshaft being rotatably connected within the crankcase, a camshaft being rotatably connected within the cylinder block, and a timing chain being drively connected between the crankshaft and the camshaft; Its features are, The cylinder body has a mounting cavity, and the timing chain is at least partially located in the mounting cavity; a balance shaft is installed in the mounting cavity, and a balance block is connected to the balance shaft; a balance transmission assembly is connected between the camshaft and the balance block, and the camshaft drives the balance block to rotate around the axis of the balance shaft through the balance transmission assembly.

2. The engine according to claim 1, characterized in that, A plane passing through both the axis of the camshaft and the axis of the crankshaft is defined as a first reference plane, and the angle between the first reference plane and any horizontal plane ranges from 0° to 40°.

3. The engine according to claim 2, characterized in that, The angle between the first reference plane and any horizontal plane ranges from 2° to 30°.

4. The engine according to claim 3, characterized in that, The angle between the first reference plane and any horizontal plane ranges from 4° to 21°.

5. The engine according to claim 4, characterized in that, The plane passing through both the axis of the camshaft and the axis of the balance shaft is defined as the second reference plane; the angle between the first reference plane and the second reference plane ranges from 0° to 10°, and the axis of the balance shaft is located above the first reference plane.

6. The engine according to claim 1, characterized in that, A plane passing through both the axis of the camshaft and the axis of the crankshaft is defined as a reference plane, and the angle between the first reference plane and any horizontal plane ranges from 79° to 90°.

7. The engine according to claim 1, characterized in that, The balance transmission assembly includes a driving member and a driven member. The driving member is fixedly connected to the camshaft and is drivenly connected to the driven member. The driven member is connected to the balance block and can drive the balance block to rotate around the axis of the balance shaft. A balance bearing is connected between the balance shaft and the driven member. An oil chamber is provided in the balance shaft and is connected to the balance bearing. An oil passage is provided in the cylinder body and is connected to the oil chamber.

8. The engine according to claim 1, characterized in that, The timing chain and the balance block are located on opposite sides of the balance transmission assembly along the axial direction of the camshaft.

9. A motorcycle, comprising: Frame; A body panel that at least partially covers the vehicle frame; A walking system, which is at least partially connected to the vehicle frame; The motorcycle is characterized in that it further includes a powertrain, which includes a transmission and an engine as described in any one of claims 1-8, the engine being supported by the frame and driven through the transmission, the transmission being driven through the running system.

10. The motorcycle according to claim 9, characterized in that, The motorcycle is a two-wheeled scooter, and the motorcycle has a displacement of less than 200cc.

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