JP2003026074A - Motorcycle with pedal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling system of an internal combustion engine without increasing a vehicle width in a motorcycle with a pedal having a transmission mechanism for transmitting rotation of a pedal shaft by stepping force of a rider to a rear axle, the internal combustion engine, and a belt type transmission mechanism for transmitting rotation of a crankshaft of the internal combustion engine to the rear axle. SOLUTION: The pedal shaft is arranged in front of the crankshaft. An outer peripheral part of the pedal shaft is provided with a drive pulley of the belt type transmission mechanism for rotating independently of the pedal shaft, and a hollow rotary shaft having its related member. A cooling fan for forcedly cooling the internal combustion engine is arranged in a vehicle width directional almost central part in an outer peripheral part of the hollow rotary shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-wheeled motor vehicle with a pedal, which is capable of using both human-powered driving by a driver's pedaling and power-driven driving by an internal combustion engine, and more particularly to a cooling device for the internal combustion engine. is there.

[0002]

2. Description of the Related Art Although no prior art document relating to a cooling system for an internal combustion engine for a motorcycle with a pedal is found, as a similar technical field, a conventional cooling system for an internal combustion engine for a motorcycle and a cooling system for an internal combustion engine for a scooter. There are technical documents.

A cooling device for an internal combustion engine for a motorcycle is disclosed in Japanese Utility Model Laid-Open No. 59-35625. This connects the fan shaft to the tip of the chain drive sprocket shaft protruding to one side of the rear part of the internal combustion engine case,
A centrifugal fan mounted on a fan shaft is covered with a fan case, a blower pipe is connected to an outlet hole of the fan case, and a front end of the centrifugal fan is opened from a rear side to a front side toward a high temperature portion such as a cylinder.

A cooling device for an internal combustion engine for scooters is disclosed in Japanese Patent No. 2649179. This is a shroud that covers the circumference of a cylinder block and extends in a direction perpendicular to the center line of the cylinder block in an internal combustion engine that includes a cylinder block having cooling fins protruding from the outer peripheral surface and a cylinder head having a cooling liquid passage therein. Is provided to form a cooling air passage, and a radiator connected to the cooling liquid passage of the cylinder head and a blower fan for sending cooling air are provided in the cooling air passage to cool the radiator and the cylinder block with the cooling air. To do. According to the description of the embodiment, the drive source of the blower fan is the rotation of the crankshaft, and the fan is installed on the side of the cylinder block to drive gears, belts or chains, and the crankshaft is equipped with a shaft. The configuration of fixing the centrifugal fan itself to the generated generator is described.

[0005]

Conventionally, there has been an example in which a fan is arranged on the side of a sprocket of a sprocket shaft for driving rear wheels or attached to a side surface of a generator at an end of a crankshaft. In some cases, the fan and the radiator are arranged on the side of the cylinder block. In each of these examples, the fan was provided so as to project laterally from the sprocket shaft, the crank shaft, or the cylinder block, so that the lateral width of the internal combustion engine and its related parts was wide.

Further, in the case of blowing air with a blower pipe, since it is blown from the rear of the internal combustion engine, there is a drawback that the cooling wind and the traveling wind collide with each other to cancel the cooling effect.

A motorcycle with a pedal is equipped with a pedal for human power drive, and in order to facilitate driving, it is required that the width of the internal combustion engine and its related parts be narrow. None of the above-mentioned conventional techniques can meet the demand, and therefore, it has been considered that forced air cooling is difficult in a motorcycle with a pedal.

The present invention solves the above-mentioned deficiencies of the prior art, prevents the internal width of the internal combustion engine and its related parts from widening, and prevents the cooling fan and its related members from protruding laterally of the vehicle. It is intended to provide a motorcycle with a pedal, which incorporates a cooling device capable of blowing air to the cylinder block.

[0009]

Means for Solving the Problems and Effects The present invention is to solve the above problems. According to the invention of claim 1, a swing unit case having a pedal shaft, a crank shaft and a rear axle is provided. The swing mechanism is attached to the lower part of the vehicle body frame and transmits the rotation of the pedal shaft to the rear axle by the pedaling force of the driver and the belt type transmission mechanism that transmits the rotation of the crankshaft by the internal combustion engine to the rear axle. In a motorcycle with a pedal provided in a unit case, the pedal shaft is provided in front of the crank shaft, and a drive pulley of a belt type transmission mechanism that rotates independently of the pedal shaft is provided on an outer peripheral portion of the pedal shaft. A hollow rotating shaft provided with the related member is provided, and a cooling fan for forcedly cooling the internal combustion engine is provided at the outer peripheral portion of the hollow rotating shaft in the vehicle width direction. It is characterized in that disposed in the substantially central portion.

Since the invention of claim 1 is configured as described above, it is possible to dispose the cooling fan without projecting a member laterally of the internal combustion engine or the transmission mechanism.
Therefore, forced cooling can be performed without increasing the vehicle width, and a pedal-equipped motorcycle with good pedaling properties can be manufactured.

According to a second aspect of the present invention, the hollow rotary shaft provided with the cooling fan is a pulley shaft of a belt type transmission mechanism forming a part of a mechanism for transmitting power from the internal combustion engine to the rear wheels.
The cooling fan rotates integrally with the pulley shaft. With this structure, the members are commonly used, so that a motorcycle with a pedal having a narrow pedal width and a narrow vehicle width can be manufactured.

According to the invention of claim 3, the side plate of the cooling fan is
Since it is provided adjacent to the drive pulley of the belt type transmission mechanism or its related member and is fixed to the adjacent member,
Since it is not necessary to provide an extra mounting member, it is possible to make a motorcycle with a pedal having a small pedal width and a narrow vehicle width.

According to the invention of claim 4, there is provided a shroud for covering the cooling fan, guiding the cooling air from the front part of the swing unit case, and blowing the cooling air from the front toward the internal combustion engine. Since the shroud blows cooling air onto the internal combustion engine from the front, the shroud does not collide with the running wind and can effectively and forcibly cool the internal combustion engine together with the cooling by the running wind. Moreover, since the shroud does not project to the side of the vehicle, it is possible to make a motorcycle with a pedal having a narrow pedal width and a narrow pedal width.

[0014]

1 is a side view of an embodiment of a motorcycle 1 with a pedal according to the present invention. A vehicle body frame 3 that extends obliquely downward and rearward from the head pipe 2 has a rear portion that curves obliquely upward to form a vehicle body body. A steering shaft 4 is pivotally supported by the head pipe 2 and an upper portion of the steering shaft 4 is provided. A handlebar 5 that is developed to the left and right is provided, and a front wheel 7 is pivotally supported by a front fork 6 that extends downward from the steering shaft 4. The seat post 8 is fitted and inserted in a portion of the rear end portion of the vehicle body frame 3 which is inclined upward, and the seat 9 is provided on the upper end of the seat post 8.

In the lower part of the vehicle body frame 3, a swing unit case 20 which is long in the front-rear direction is held in the front portion thereof by a mounting bolt 21 on the vehicle body frame 3 so as to be swingable in the vertical direction and extended rearward. ing. The latter half of the swing unit case 20 is bifurcated, and the rear wheel 10 is pivotally supported at the rear end.

Although not shown in the drawing, the rear portion of the swing unit case 20 is connected to the rear portion of the vehicle body frame 3 through a shock absorber so that the swing unit case can be used when the vehicle runs on a bumpy road. With the action of the shock absorber, the rear wheel vibrates up and down, and the influence of the uneven road on the body frame and the driver is alleviated.

A four-stroke single-cylinder internal combustion engine 11 is mounted above the front of the swing unit case 20.
A fuel tank 12 arranged behind the seat post 8 and above the rear wheel 10 is connected and supported to the rear end of the vehicle body frame 3, and is connected to the internal combustion engine 11 below the fuel tank 12. A carburetor 13 is provided in the.

The swing unit case 20 is provided with four rotary shafts oriented in the left-right direction. In order from the front, the first shaft is the pedal shaft 30, the second shaft is the crankshaft 50 of the internal combustion engine 11, the third shaft is the intermediate shaft 60, and the fourth shaft is the rear axle 80 supporting the rear wheel 10. Is.

FIG. 2 is a horizontal sectional view of the swing unit case 20 including the above four shafts, and FIG. 3 is a III-III section of FIG.
FIG. 4 is a sectional view taken along line IV-IV in FIG. In FIG. 2, the framework of the swing unit case 20 includes a right case 22 and a left case 23 that extend in the front-rear direction in the central portion, and further, on the outer surfaces thereof, a right cover 24 that covers the right outer surface of the right case 22, and a left outer surface of the left case 23. And a rear rotary shaft holding member 26 provided inside the rear portion of the left case 23. The rear rotary shaft holding member 26 is attached to the left case 23 with a bolt 27.

In the front part of the swing unit case 20, a pedal shaft 30 penetrates through the four cases and covers, and is rotatably supported by the right case 22 and the left cover 25 via bearings 31, 31. There is. Both ends of the pedal shaft 30 project to the outside of the covers 24 and 25 on both sides, and the pedals 33 are attached thereto via the pedal arms 32, respectively.

A manual drive sprocket 35 is mounted near the right end of the pedal shaft 30 between the right case 22 and the right cover 24 via a pedal shaft one-way clutch 34.
The pedal shaft one-way clutch 34 has a structure in which the normal rotation of the pedal shaft 30 is transmitted to the human-powered drive sprocket 35 for normal rotation, and the reverse rotation of the pedal shaft 30 is not transmitted to the human-powered drive sprocket 35.

A drive pulley 36 of a V-belt type continuously variable transmission is provided on the left half of the pedal shaft 30. In particular,
A drive pulley fixing half 37 having a long sleeve portion 37a that covers the outer periphery of the left half of the pedal shaft 30 is rotatably supported by the right case 22 and the left cover 25 via bearings 38, 38. Since the sleeve portion 37a and the pedal shaft 30 are not in contact with each other and are supported by separate bearings, the movements of the sleeve portion 37a and the pedal shaft 30 are irrelevant. The sleeve portion 37a plays a role of a hollow rotating shaft that supports the drive pulley 36 and its related members. The spline 37 is provided on the outer peripheral surface of the sleeve portion 37a of the drive pulley fixing half 37.
b is formed, and the drive pulley movable half body 39 is fitted so as to be slidable in the axial direction. A pair of the drive pulley fixed half 37 and the drive pulley movable half 39 forms a set of drive pulleys 36.

The sleeve portion 37 of the drive pulley fixing half 37
On the outer peripheral portion of a, adjacent to the drive pulley movable half 39,
The ramp plate 40 is fitted in the sleeve portion 40a via the key 41 and is restrained from moving in the axial direction, so that the drive pulley fixing half 37 and the ramp plate 40 are integrated. Centrifugal weight 42 is attached to ramp plate 40, drive pulley movable half 39 and ramp plate 40.
It is held so that it can move in the radial direction between and. As shown in FIG. 4, a cylindrical toothed pulley 40b is formed on the outer peripheral portion of the ramp plate 40, and a toothed belt 43 is wound around the pulley 40b.

A side plate 45 of a fan 44 is fixed to the lamp plate 40 with a screw 46. Fan blades 47 are integrated with the side plate 45. FIG. 5 is a vertical cross-sectional view of the portion of the fan 44, showing the side plate 45 from the left. Feather 47
Is indicated by a chain line because it is on the other side of the side plate. fan
A shroud 48 is provided which covers 44 and guides cooling air from the front of the swing unit case 20 and blows cooling air from the front toward the cylinder block 11a of the internal combustion engine 11 and the cylinder head 11b.

[0025] Lamp plate 40 with toothed belt 43
When is driven to rotate, the drive pulley fixed half body 37, the drive pulley movable half body 39, the lamp plate 40, and the fan 44 rotate together.

In FIG. 2, the crankshaft 50 of the internal combustion engine 11
Are rotatably supported by the right case 22 and the left case 23 via bearings 51, 51. Between the left side case 23 and the left side cover 25, an AC generator 52 that doubles as a starter for the internal combustion engine is provided. The stator 53 of the AC generator 52 is fixed to the left case 23 by bolts 54. The rotor 55 of the AC generator 52 has a shape that covers one end surface, the inner circumference, and the outer circumference of the stator 53, and has a boss portion at the center thereof for the crankshaft 50.
It is fixed to the left end of the crankshaft and rotates together with the crankshaft 50.

As shown in FIG. 4, the outer periphery of the rotor 55 is a toothed pulley 55a having teeth on its outer surface, and the toothed belt 43 is a toothed pulley of the lamp plate 40.
When the internal combustion engine is rotated by being wound around 40b, the rotation is transmitted to the drive pulley 36 via the ramp plate 40.

The intermediate shaft 60 includes a left case 23 and a rear rotary shaft holding member 26 fastened to the left case 23 with bolts 27.
And are rotatably supported by a pair of bearings 61, 61. A small-diameter gear 62 for driving the rear axle 80 is integrally formed on a portion of the intermediate shaft 60 between the left case 23 and the rear rotary shaft holding member 26.

The intermediate shaft 60 extends from the position of the bearing 61 of the left side case 23 to a position near the inner wall surface of the left side cover 25, where a driven pulley 63 of a V-belt type continuously variable transmission and a starting clutch 67 are provided. It is provided.

The fixed half 64 of the driven pulley 63 is rotatably supported by the intermediate shaft 60 via a pair of bearings 65 by its slightly long sleeve portion 64a. A spline is formed on the outer peripheral surface of the sleeve portion 64a of the fixed half body 64, and a driven pulley movable half body 66 is spline-fitted therein so as to be slidable in the axial direction. A pair of the driven pulley fixed half body 64 and the driven pulley movable half body 66 constitutes a set of driven pulleys 63.

Sleeve part 64 of driven pulley fixing half 64
The drive plate 68 of the starting clutch 67 is fixed to the end of a so that it can rotate integrally with the driven pulley fixing half 64. A clutch shoe 69 is attached to the drive plate 68 and swings outward when a centrifugal force is applied. A coil spring 70 that applies a side pressure to the driven pulley movable half body 66 is mounted between the drive plate 68 of the starting clutch 67 and the driven pulley movable half body 66.

At the left end of the intermediate shaft 60, the drive plate
A clutch outer 71 having an outer peripheral tubular portion that covers the clutch shoe 69 of 68 is fixed, and rotates together with the intermediate shaft 60.

The driven pulley 63 and the drive pulley 36
As shown in FIG. 3, a V-belt 72 is looped between and. Drive pulley 36, lamp plate 40,
A V-belt type continuously variable transmission is configured by the drive unit including the centrifugal weight 42 and the like, the driven unit including the driven pulley 63 and the coil spring 70, and the V-belt 72.

The rear axle 80 is supported by the right case 22 and the rear rotary shaft holding member 26 via a pair of bearings 81, 81.
A hub 82 is fixed to the center of the rear axle 80, and the spokes 83 hold the rear wheel 10. The brake device 84 is supported by the right case 22, and its brake shoe 84 a is located inside the hub 82.

The rear axle 80 is provided with an extension portion extending in the left-right direction of the pair of bearings 81, 81. A human-power driven sprocket 85 is fixed to the right-side extension portion between the right-side case 22 and the right-side cover 24, and an endless chain 86 is hung between the human-power drive sprocket 35 mounted on the pedal shaft 30. A pedal shaft that is rotated and driven by the pedal force of the driver
A human-powered drive mechanism that transmits the forward rotation of 30 to the rear axle 80 is formed.

A large diameter gear 88 is mounted on the left extension of the rear axle 80 between the left case 23 and the rear rotary shaft holding member 26 via a rear axle one-way clutch 87, as shown in FIG. In addition, the small diameter gear formed on the intermediate shaft 60.
It meshes with 62 to form a rear gear reduction mechanism. The rear axle one-way clutch 87 has a structure capable of transmitting the rotational driving force of the large diameter gear 88 to the rear axle 80, but not the power transmission in the opposite direction.

Since one embodiment of the present invention is configured as described above, the operation of power transmission will be described below. The motorcycle 1 can be used in any one of the propulsion method of manpower propelled through the pedal 33 and power propelled by the internal combustion engine 11.

When the driver steps on the pedal, the pedal shaft rotates due to the pedaling force, and the rotational driving force is transmitted through the pedal shaft one-way clutch 34, the manual drive sprocket 35, the endless chain 86, and the manual drive sprocket 85. The rear wheels 80 are transmitted to the rear axle 80, the rear wheels 10 rotate together with the rear axle 80, and the vehicle moves forward.

During manual running, the rotation of the pedal shaft 30 does not affect the drive pulley 36 that is supported independently of the pedal shaft 30. Further, during manual driving, the rotation of the rear axle 80 does not affect the large diameter gear 88 or the intermediate shaft 60 due to the action of the rear axle one-way clutch 87.

When the internal combustion engine 11 is started, the crankshaft 50
Rotates, and the rotation is transmitted to the lamp plate 40 via the rotor 55 of the alternator 52 and the toothed belt 43,
The lamp plate 40, the drive pulley 36, and the cooling fan 44 rotate together. This rotation is transmitted to the driven pulley 63 held by the intermediate shaft 60 via the endless V-belt 72, the starting clutch 67 is connected, the intermediate shaft 60 is rotated, and the small diameter gear 62 of the intermediate shaft 60 is connected. , Large-diameter gear 88, and transmitted to the rear axle 80 via the rear axle one-way clutch 87,
The rear wheels 10 rotate with the rear axle 80, and the vehicle moves forward. In the intermediate process of power transmission, the gear ratio is changed by the action of the centrifugal weight 42 held by the ramp plate 40. During power running, the rotation of the rear axle 80 is not transmitted to the pedal shaft 30 and the pedal 33 due to the action of the pedal shaft one-way clutch 34.

When the internal combustion engine is rotating, the fan 44 always rotates, the air in the swing unit case 20 is sucked, the fan 44 blows the air, and the shroud 48 passes through the cylinder block 11a and the cylinder head of the internal combustion engine 11. It is blown to high temperature parts such as 11b, and forced cooling is performed together with running wind cooling. The air in the swing unit case 20 is sucked and flows by the fan 44, and the pulley and the V belt are air-cooled. Even when the vehicle is stopped, if the internal combustion engine is rotating, the internal combustion engine is forcibly cooled.

FIG. 6 is a cross-sectional view of another embodiment relating to the peripheral portion of the fan. The difference from the previous embodiment is that the shroud 48A extends to just before the cylinder block 11a of the internal combustion engine 11 and the like. By doing so, the cooling effect of the forced cooling air blown from the fan 44 on the internal combustion engine 11 can be enhanced. The shroud may be further extended to cover the cylinder block 11a and the like so that the air after cooling the cylinder block is discharged to the rear of the cylinder block 11a. With this configuration, the cooling effect of the forced cooling air blown from the fan 44 can be further enhanced.

As described in detail above, in the above embodiment, the pedal shaft is provided in front of the crank shaft, and the V-belt type continuously variable transmission is provided on the outer peripheral portion of the pedal shaft and rotates independently of the pedal shaft. The drive pulley fixed half sleeve part (a kind of hollow rotary shaft) and the sleeve part of the lamp plate that is integral with the sleeve part are provided in the vehicle width direction approximately in the center and in the outer peripheral space of the sleeve part. Since the member of the power transmission mechanism is not provided, the cooling fan of each of the above-described embodiments is provided by utilizing this space, and the cooling fan is arranged on the side of the transmission mechanism without projecting the member. Therefore, forced cooling is possible without increasing the vehicle width, and the pedal-equipped motorcycle has good pedaling characteristics.

In each of the above embodiments, the cooling fan is attached to the lamp plate forming a part of the belt type transmission mechanism forming a part of the mechanism for transmitting power from the internal combustion engine to the rear wheels, and is integrated with the lamp plate and the pulley. Since the members are commonly used by rotating the same, and no extra mounting member is provided, it is possible to make a motorcycle with a pedal having a narrow pedal width and a narrow vehicle width.

Further, since the cooling fan is provided, the cooling air is guided from the front part of the swing unit case, and the shroud for blowing the cooling air from the front toward the cylinder block and the cylinder head of the internal combustion engine is provided.
The internal combustion engine can be effectively forcibly cooled together with the cooling by the running wind. The positional relationship between the shroud outlet and the internal combustion engine can be set arbitrarily, and can be set in any shape depending on the margin of the installation place. Since the shroud does not extend to the side of the vehicle, it is possible to make a motorcycle with a narrow pedal. The air in the swing unit case is sucked by the fan and flows, which has the additional effect of air cooling the pulley and the V-belt.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle with a pedal according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the swing unit case of the motorcycle with a pedal including each rotation shaft.

FIG. 3 is a vertical cross-sectional view of the swing unit case including a pulley of a V-belt type continuously variable transmission.

FIG. 4 is a vertical sectional view of the swing unit case including an AC generator.

FIG. 5 is a vertical cross-sectional view of the cooling fan and its peripheral portion of the above embodiment as viewed from the left side.

FIG. 6 is a vertical cross-sectional view of another embodiment of the cooling fan and its peripheral portion viewed from the left side.

[Explanation of symbols]

1 ... Motorcycle with pedal, 2 ... Head pipe, 3 ... Body frame, 4 ... Steering shaft, 5 ... Steering wheel, 6 ... Front fork, 7 ... Front wheel, 8 ... Seat post, 9 ... Seat, 10 ... Rear wheel, 11 ... internal combustion engine, 11a ... cylinder block, 11b ... cylinder head, 12 ... fuel tank, 13 ... carburetor, 20 ... swing unit case, 21 ...
Mounting bolts, 22 ... right side case, 23 ... left side case, 24 ... right side cover, 25 ... left side cover, 26 ... rear rotary shaft holding member,
27 ... Bolt, 30 ... Pedal shaft, 31 ... Bearing, 32 ... Pedal arm, 33 ... Pedal, 34 ... Pedal shaft One-way clutch, 35
… Human-powered drive sprockets, 36… Drive pulleys, 37
… Drive pulley fixing half, 37a… Sleeve part, 37b…
Spline, 38 ... Bearing, 39 ... Drive pulley movable half,
40 ... Lamp plate, 40a ... Sleeve part, 40b ... Toothed pulley, 41 ... Key, 42 ... Centrifugal weight, 43 ... Toothed belt, 44 ... Fan, 45 ... Side plate, 46 ... Screw, 47 ... Blade, 48 ...
Shroud, 48A ... Shroud of another shape, 50 ... Crankshaft, 51 ... Bearing, 52 ... Alternator, 53 ... Stator, 54 ...
Bolt, 55 ... Rotor, 55a ... Toothed pulley, 60 ... Intermediate shaft, 61 ... Bearing, 62 ... Small diameter gear, 63 ... Driven pulley, 64
… Driven pulley fixed half, 64a… Sleeve part, 65… Bearing, 66… Driven pulley movable half, 67… Start clutch,
68 ... Drive plate, 69 ... Clutch shoe, 70 ... Coil spring, 71 ... Clutch outer, 72 ... V belt, 80 ... Rear axle, 81 ... Bearing, 82 ... Hub, 83 ... Spoke, 84 ... Brake device, 84a ... Brake Shoe, 85… Human driven sprocket, 86… Endless chain, 87… Rear axle one-way clutch, 88… Large diameter gear.

Claims (4)

[Claims] 1. A swing unit case having a pedal shaft, a crank shaft, and a rear axle is swingably attached to a lower portion of a vehicle body frame, and a transmission mechanism for transmitting the rotation of the pedal shaft to the rear axle due to a pedaling force of a driver. , A belt type transmission mechanism that transmits the rotation of the crankshaft by the internal combustion engine to the rear axle,
In a motorcycle with a pedal provided in the swing unit case, the pedal shaft is provided in front of the crankshaft, and a drive of a belt type transmission mechanism is provided on an outer peripheral portion of the pedal shaft, which rotates independently of the pedal shaft. A hollow rotary shaft provided with a pulley and its related members is provided, and a cooling fan for forcedly cooling the internal combustion engine is arranged at an outer peripheral portion of the hollow rotary shaft at a substantially central portion in the vehicle width direction. The characteristic motorcycle with a pedal. 2. The hollow rotary shaft is a pulley shaft of a belt type transmission mechanism forming a part of a mechanism for transmitting power from an internal combustion engine to rear wheels, and the cooling fan rotates integrally with the pulley shaft. The motorcycle with a pedal according to claim 1, characterized in that. 3. The pedal-equipped motorcycle according to claim 1, wherein the side plate of the cooling fan is fixed to the drive pulley of the belt type transmission mechanism or a member related thereto. 4. A shroud that covers the cooling fan, guides cooling air from the front of the swing unit case, and blows cooling air from the front toward the internal combustion engine. Motorcycle with pedal.