CN1756693A - motorcycle - Google Patents

Abstract

A motorcycle has a frame consisting of a first frame and a second frame. The first frame extends in front of rider's legs, in the vertical direction of the motorcycle, and the second frame extends rearward, in the longitudinal direction of the motorcycle, from the lower part of the first frame. The motorcycle further has a front cover for covering the first frame; a floor for covering the second frame, the floor extending rearward from the lower part of the front cover and having an upper surface as a surface on which rider's feet can be placed; an engine for driving the motorcycle, the engine being located rearward, in the longitudinal direction, of the floor; and an air inlet in the front of the motorcycle. The lower surface further has upper and lower guide surfaces arranged side by side in the lateral direction of the motorcycle. The guide surfaces are at positions with a difference in height, resulting from the step, in the vertical direction. Air is introduced from the air inlet and led to the engine through the inside of the floor.

Description

motorcycle

technical field

The invention relates to motorcycles including scooters.

Background technique

A related first type of scooter includes shin guards for covering the rear area of the down tube of the frame. The scooter includes footrests extending from the lower end of the shin guard toward the rear of the scooter to support the driver's feet. The scooter includes a lower cover for covering the lower surface of the footboard. The scooter includes an engine arranged in the rear area of the footboard. An air introduction passage for introducing cooling air to the engine is provided between the footboard and the lower cover (see JP-A-10-16854).

A second type of scooter includes flat pedals that extend downward from the space between the handlebars and the seat and are curved at the lower position. The footboard has a lower skeleton type frame in the middle of which is provided with a groove extending in the longitudinal direction. The small motorcycle is equipped with a power unit under the seat, and the power unit is composed of an integrated engine and power transmission equipment. The front end of the scooter can be open before the handlebars. A cooling air duct opening to the inside of the above groove is provided at the rear end of the scooter (JP-A-7-96878).

A third type of scooter includes an air intake duct for introducing cooling air to the engine. The air introduction duct has an intake port formed near the lower leg guard and opened forward, and extends toward the rear of the vehicle body. The rear end of the duct is opposite to the opening of the fan case, which communicates with the intake port of the cooling fan for the engine, and there is a space between the end of the duct and the opening of the fan case. When the scooter is running at low speeds, air is drawn directly through openings in the fan housing. When the scooter is running at high speed, air is introduced through the duct into the inside of the fan case to cool the engine (JP-A-5-65086).

Contents of the invention

An object of the present invention is to provide a motorcycle capable of properly introducing air into an area requiring air cooling while ensuring a sufficient amount of air. To achieve this, mixing of various types of air separately introduced through the air introduction paths is prevented by the designed shape of the lower surface of the bottom plate.

According to a first aspect of the present invention there is provided the following motorcycle. The motorcycle includes a frame. The frame has a first frame portion extending in a vertical direction of the motorcycle forward of the rider's legs. The frame has a second frame portion extending rearward from a lower area of the first frame in the longitudinal direction of the motorcycle. The motorcycle includes a front cover covering the first frame portion. The motorcycle includes a floor covering the second frame portion, extending rearward from a lower area of the front cover, and having an upper surface as a surface on which a driver's foot can be placed. The motorcycle includes a prime mover disposed in the rear region of the floor in the longitudinal direction to drive the motorcycle. The motorcycle comprises air inlets arranged on a front area of said motorcycle. A stepped portion extending in the longitudinal direction is provided on a lower surface of the bottom plate. An upper guide surface and a lower guide surface are provided on the lower surface of the bottom plate, the upper guide surface and the lower guide surface are arranged side by side with each other in the lateral direction of the motorcycle and positioned in the vertical direction by the stepped portion at different levels. Air is introduced through the inlet and directed through the interior of the floor to the prime mover.

The lower guide surface may have a rear end extending downward in a vertical direction.

The lower guide surface may extend further rearward in the longitudinal direction than the upper guide surface.

The stepped portion may expand as it extends rearward in the longitudinal direction.

The bottom plate may include side surfaces to form a concave surface extending in the longitudinal direction and concave toward an inner side.

The concave surface is formed adjacent to the upper guide surface. A protrusion protruding to the outside may be provided between the upper guide surface and the concave surface.

The prime mover includes an engine and a discharge pipe extending rearwardly from the engine in the longitudinal direction. The discharge pipe may extend toward the rear of the upper guide surface in the longitudinal direction.

The prime mover includes an engine, and an oil tank is provided on a lower portion of the engine. At least a part of the oil tank may be arranged behind the lower guide surface in the longitudinal direction.

The prime mover includes an engine and an air cleaner connected to the engine. The intake port of the air cleaner may be arranged behind the bottom plate in the longitudinal direction and above an upper surface of the bottom plate in the vertical direction.

The prime mover includes power transmission equipment. The power transmission apparatus may have an intake port arranged behind the base plate in the longitudinal direction and above an upper surface of the base plate in the vertical direction. The intake port introduces air to cool the inside of the power transmission device.

The prime mover includes a fan that uses air to cool the prime mover. An intake port of the fan may be arranged behind the concave surface of the bottom plate in the longitudinal direction.

An intake port of the fan opens in the lateral direction. The prime mover may include an air introduction wall disposed at least behind the intake port in the longitudinal direction and below the intake port in the vertical direction, and at least in the longitudinal direction. protrudes in the transverse direction.

The front cover includes a rear cover portion for covering the vehicle frame from behind in the longitudinal direction. The front cover includes a front cover portion for covering the vehicle frame from the front in the longitudinal direction. The inlet is formed on the front cover portion. Air is directed through the space between the front cover portion and the rear cover portion to the floor.

According to a second aspect of the present invention there is provided the following motorcycle. A motorcycle includes a prime mover. Motorcycles include foot pedals for introducing air to the prime mover. The footboard has a footrest. The footboard has a cover for covering the footrest. A footrest has a duct formed by the footrest and the cover. The cover includes a wall opposite the footrest. The walls include first and second walls extending side by side in the transverse direction along the duct. The wall includes a partition portion for providing a stepped portion between the first and second walls so that air is separately supplied to the first and second walls.

The partition portion may extend along the duct such that a large step portion may be provided between the first and second walls.

At least one of the first and second walls may include an end having a vent lattice adjacent the prime mover.

One of the first and second walls may extend further than the other of the first and second walls.

The motorcycle also includes a cover for forming ducts communicating with the ducts of said pedals. The hood has an inlet for introducing air into the duct.

Description of drawings

Fig. 1 is a side view of a scooter in an embodiment according to the present invention.

FIG. 2 is an enlarged perspective view illustrating a rear region of a body of the scooter shown in FIG. 1 .

Fig. 3 is the bottom view of the lower cover of the scooter shown in Fig. 1, wherein: arrow A1 represents the air supplied to the engine intake port; arrow A2 represents the air flowing to the fuel tank; arrow A3 represents the air flowing to the fan; And the arrow A4 indicates the air flowing to the discharge pipe.

FIG. 4 is an enlarged sectional view of the scooter taken along line IV-IV in FIG. 2 .

Fig. 5 is an enlarged front view of an inner cover of the scooter shown in Fig. 1 .

Fig. 6 is an enlarged side view of the inner cover shown in Fig. 5 .

Fig. 7 is an enlarged sectional view of the scooter taken along line VII-VII in Fig. 1 .

Fig. 8 is an enlarged sectional view of the scooter taken along line VIII-VIII in Fig. 1 .

Fig. 9 is an enlarged side view of the opening of the inner cover shown in Figs. 5 and 6 .

In the drawings, L.D indicates the longitudinal direction of the scooter or the respective components, and F and R indicate the front and rear, respectively. T.D indicates the lateral direction of the scooter or individual components. L and R indicate left and right, respectively, with respect to the traveling direction of the vehicle. V.D indicates the vertical direction of the scooter or individual components, while U and L indicate the upward and downward directions respectively.

Detailed ways

Embodiments according to the present invention are described below with reference to the drawings.

Referring to FIG. 1, a scooter 1 includes a body 3 constituting its frame. A front portion 3F, a middle portion 3C and a rear portion 3R of this vehicle body 3 are integrated by a frame 5 which is divided into right and left portions each of which is bent in a U shape. The front portion 3F of the vehicle body 3 includes a head pipe 7 extending downward. The upper area of the head pipe 7 is connected to a pair of left and right handlebars 9 which are rotatably supported. The head pipe 7 is connected with a steering shaft 10 extending downward and freely rotating.

The lower end of the steering shaft 10 supports the front wheel Wf via the lower bracket 11 and the front shock absorber 12 so that the front wheel Wf can freely rotate. The upper area of the front wheel Wf is covered by a front fender 13 .

At the center of the middle portion 3C of the vehicle body 3, a floor cover 15 is provided as a footrest on which the driver's feet are placed. The floor cover 15 is supported by the middle region of the main frame 5 . The head pipe 7 is arranged on the area from the floor cover 15 to the front portion 3F of the vehicle body 3 . The floor cover 15 is integrally connected to the rear leg shield 17B extending upward to the head pipe 7 . The rear leg guard 17B covers the front and rear surfaces of the head pipe 7 . The rear leg shield 17B is supported by the front area of the main frame 5 and covers the front area of the driver's legs.

The front part of the rear leg shield 17B is connected to the inner cover 19 to be integrated. The upper area of the inner cover 19 is attached to the front shin panel 17F. The front leg shield 17F, the rear leg shield 17B, and the inner cover 19 constitute the front cover 20 as a cover. The rear area of the inner cover 19 is connected to the lower cover 21 . The inner cover 19 and the base cover 15 form a base 22 . The lower cover 21 and the floor cover 15 form a footrest. The floor cover 15 provides a footrest.

The vehicle body 3 includes a rear cover 23 for covering the rear portion 3R. The rear cover 23 is supported by the rear area of the frame 5 . A freely rotating rear wheel Wr is provided under the rear end of the rear area of the frame 5 . The prime mover 29 is equipped under the rear area of the main frame 5 . The prime mover 29 includes an engine 25 and a power transmission device 27 for driving the rear wheels Wr. An electric motor may be used instead of the engine 25 . The prime mover 29 may be fixed to the vehicle body 3 or may be supported by the vehicle body 3 so that the prime mover 29 can swing. A portion of the prime mover 29 may protrude toward the inside of the base plate 22 .

Referring to FIG. 2 and FIG. 1 , a shroud 31 as a forced air cooling device is provided near the right side of the engine 25 . An outer wall (rib) 33 as an air introduction wall is formed on an outer peripheral portion of the shroud 31 . The rear portion of the vehicle frame 5 is connected to the upper rear region of the power transmission device 27 via a rear shock absorber 35 . A vehicle seat 37 on which the driver sits is arranged on the upper region of the rear cover 23 . The engine 25 is connected to one end of an exhaust pipe 39 . The other end of the discharge pipe 39 is connected to a muffler 41 provided in the rear area of the rear portion 3R of the vehicle body 3 .

An air introduction path 43 as a duct is formed in the bottom plate 22 . The air introduction path 43 extends long in the longitudinal direction of the vehicle body 3 to the vicinity of the prime mover 29 . The air introduction path 43 guides air introduced from the outside to the prime mover 29 .

Referring to FIGS. 3 and 4 , the lower cover 21 includes side walls 21A and 21B opposite to each other. The side walls 21A and 21B are fixed to the floor cover 15 . The lower cover 21 includes a bottom wall or lower surface extending from the side wall 21A and opposing the floor cover 15 . This bottom wall includes a first guide wall 21C as a substantially horizontal first flat portion or first guide surface. The bottom wall includes a stepped portion 21D integrally formed with this first guide surface 21C and extending in the longitudinal direction of the vehicle body 3 . The bottom wall includes a second guide wall 21E as a substantially horizontal second lower flat portion or second guide surface, one end of which is connected to the stepped portion 21D and the other end is connected to the side wall 21B. As shown in FIG. 3 , the stepped portion 21D expands as it extends backward. The lower cover 21 has an inclined member 21F as a louver, which is integrally formed with the rear end of the second guide wall 21E as an extension thereof, and is inclined downward or outward. The floor cover 15 is provided on the upper surfaces of the side walls 21A and 21B. The respective walls 21A to 21E and the floor cover 15 constitute an air introduction path 43 . The first guide wall 21C and the second guide wall 21E constitute the lower area of the air introduction path 43 . The first guide wall 21C and the second guide wall 21E are partitioned by the stepped portion 21D. The first guide wall 21C is defined as the lower surface of the bottom plate 22 at a higher position, and the second guide wall 21E is defined as the lower surface of the bottom plate 22 at a lower position. Thereby, the first guide wall 21C is positioned at a higher level than the second guide wall 21E in the vertical direction of the vehicle body. The lower second guide wall 21E extends further rearward than the higher first guide wall 21C. The second guide wall 21E protrudes further outward than the first guide wall 21C in the vertical direction of the vehicle body. In FIG. 3 , a discharge hole 44 is provided substantially at the central area on the front area of the lower cover 21 .

An air introduction path 43A as a space is provided between the first guide wall 21C and the floor cover 15 . For example, the air introduction path 43A guides clean weak cooling air A1 to the rear in FIG. 3 . In FIG. 4, air A1 is supplied to the intake port 25A of the engine 25 extending from one end of the vehicle body 3 in the lateral direction (ie, substantially from the left toward the middle region), so the engine 25 can be cooled. The intake port 25A of the engine 25 is arranged on the back of the bottom plate 22 and above the upper surface of the bottom plate 22 . The intake port 25A opens to the front surface of the air cleaner 26 .

An air introduction path 43B as a space is provided between the second guide wall 21E and the floor cover 15 . For example, the air introduction path 43B guides the slightly polluted strong cooling air A2 to the rear. The air A2 cools a part of the oil tank 54 provided on the lower part of the engine 25 . Air A2 is supplied to intake port 27A connected to, for example, a belt chamber of power transmission device 27 arranged at the other end (ie, right side in the lateral direction) of vehicle body 3 to cool the belt chamber. The intake port 27A is arranged on the back of the bottom plate 22 and above the upper surface of the bottom plate 22 .

For example, when the polluted strong cooling air flows horizontally in the air introduction path 43B, the mud and water carried by the cooling air pass through the inclined member 21F provided obliquely on the lower area of the second guide wall 21E to move in the oblique direction. are discharged in the downward and rearward directions.

In FIG. 4 , the vehicle body 3 includes a shroud 31 as a forced air cooling device using a fan located on the left side of the engine 25 . The shroud 31 has an air intake port 45 (see FIG. 2 ). The lower cover 21 has an air introduction hole 47 to introduce cooling air into the intake port 45 . On the side of the side wall 21A of the lower cover 21 is formed a concave surface 49 concave toward the inside. The concave surface 49 extends in the longitudinal direction to guide air to the air introduction hole 47 . The concave surface 49 is positioned adjacent to the side wall 21A serving as a surface in the upper region of the first guide wall 21C of the lower cover 21 . The protrusion 50 is provided between the upper area of the concave surface 49 and the side wall 21A to form a stepped portion.

An air introduction wall 33 extending in the lateral direction of the vehicle body 3 is positioned on the outer peripheral portion of the shroud 31 on the side away from the air introduction hole 47 . The air introduction wall 33 allows easy introduction of air through the intake port 45 . The intake port 45 is formed in the lateral direction of the vehicle body 3 and opens leftward or rightward.

In FIG. 4, the protrusion 51 is positioned on the outer wall of the first guide wall 21C of the lower cover 21, that is, on the side wall 21A side. The protrusion 51 is arranged away from the stepped portion 21D and extends in the lateral direction of the vehicle body 3 . An air guide groove 53 extending long in the longitudinal direction of the vehicle body 3 is formed by the protrusion 51 and the stepped portion 21D. The air guide groove 53 guides cooling air to cool the discharge pipe 39 extending in the lower area side of the engine 25 .

The discharge pipe 39 is arranged to pass through the rear of the first guide wall 21C. At least a part of the oil tank 54 positioned under the engine 25 is arranged behind the second guide wall 21E as a bottom wall of the bottom plate 22 at a lower position.

In FIG. 1 , the front cover 20 includes a rear leg shield 17B as a cover covering the rear area of the vehicle frame 5 . The front cover 20 includes a front leg shield 17F as a cover covering the front area of the vehicle frame 5 . The front leg shield 17F has an inlet 55 as an intake port. Air is guided to the bottom plate 22 through a space serving as a duct formed between the front leg shield 17F and the rear leg shield 17B. Therefore, air can be easily introduced into the bottom panel 22 from the front through the inlet 55 .

A space as a duct is formed between the rear leg shield 17B and the inner cover 19 . This space provides the front area of the air introduction path 43 . The front upper end 19A of the inner cover 19 shown in FIGS. 5 and 6 extends toward the middle portion of the rear leg shield 17B shown in FIG. 1 . In FIG. 7, the front upper end 19C is close to or contacts the middle portion of the rear leg shield 17B. In FIGS. 5 and 8 , an inlet 55 for the air introduction path 43 is formed on the inner cover 19 below the front upper end 19A.

In FIG. 5 , the inlet 55 is separated from each other in the lateral direction from the intermediate portion 19C, which is the middle region of the inner cover 19 in the lateral direction, which is interposed between the inlets 55 . Each inlet 55 extends longer in the lateral direction of the inner cover 19, and includes a plurality of openings 57 that open upward. In FIG. 9 , the openings 57 have a predetermined width D between each other in the longitudinal direction of the inner cover 19 . The inner cover 19 has a plurality of opening forming members 59 as ventilation cells extending in the lateral direction of the inner cover 19 . The opening forming member 59 has an upward slope toward the front face F of the inner cover 19 .

The operation of the conduits included in the scooter 1 is discussed below.

When the engine 25 is started, the scooter 1 travels forward. The front shin panel 17F and the inner cover 19 receive air from the front. A part of the air is introduced into the duct formed between the rear leg shield 17B and the inner cover 19 through the inlet 55 . Air is guided to the air introduction path 43 by ducts.

Air is introduced into the front area of the air introduction path 43 from the front. Air passes through an air introduction path 43 provided between the floor cover 15 and the lower cover 21 to be guided to the rear. During this stage, as the air flows backward, the air is divided into two types of air A1 and A2 by the step portion 21D.

The air A1 flows along the air introduction path 43A provided between the first guide wall 21C and the floor cover 15 . The air A1 flows upward from the outlet of the air introduction path 43A to be supplied to the intake port 25A of the engine 25 . Therefore, the air A1 efficiently cools the engine 25 and other components.

On the other hand, the air A2 flows along the air introduction path 43B provided between the second guide wall 21E and the floor cover 15 . The air A2 flows upward from the outlet of the air introduction path 43B. Air A2 is supplied to the intake port 27A to effectively cool the belt chamber. The mud and water carried by the air flow through the space between the second guide wall 21E and the floor cover 15 and through the inclined member 21F shown in FIG. 4 , and are discharged rearward and downward. This structure prevents mud and water from splashing on the belt chamber constituting the power transmission device 27 and its peripheral components.

The air A3 is guided rearward by the concave surface 49 on the outer surface of the lower cover 21 , and flows into the air introduction hole 47 . In FIG. 2 , this air A3 flows through the intake port 45 and cools the engine 25 .

The air A4 is guided rearward by the guide groove 53 on the outer surface of the lower cover 21 and cools the discharge pipe 39 .

According to the above-described embodiment, the scooter 1 includes the frame 5 . The frame 5 has a first frame portion extending in a vertical direction in front of the driver's legs, and a second frame portion extending rearward from a lower area of the first frame portion. The scooter 1 includes a front cover 20 covering the first frame portion. The scooter 1 comprises a floor 22 covering the second frame portion of the frame 5 . The bottom panel 22 extends rearwardly from the lower area of the front cover 20 and has an upper surface as a surface on which the driver's feet can rest. The scooter 1 includes a prime mover 29 disposed near the rear area of the floor 22 to drive the vehicle. The scooter 1 comprises an entrance 55 provided on the front area of the vehicle. Air is introduced through the inlet 55 and passes through the interior of the floor 22 to the rear. A stepped portion 21D extending in the longitudinal direction of the vehicle is provided on the bottom wall of the floor 22 . The guide walls 21C and 21E positioned at different height levels due to the stepped portion 21D are arranged side by side with each other in the lateral direction. Therefore, by the designed shape of the lower surface of the bottom plate 22, it is possible to prevent mixing of the two types of air respectively introduced through the air introduction paths 43 while ensuring a sufficient amount of air, and to supply air to an area requiring air cooling.

The inclined member 21F extends downward from the rear end of the second guide wall 21E which is the bottom wall of the bottom plate 22 and is located at a lower position. The inclined member 21F also prevents mixing of the air passing inside the bottom plate 22 and the air under the bottom plate 22 .

The second guide wall 21E serving as the bottom wall of the bottom plate 22 and located at a lower position extends rearward longer than the first guide wall 21C located at a higher position. Thereby, mixing of the air passing through the inside of the bottom plate 22 and the air below the bottom plate 22 can be further prevented.

The stepped portion 21D expands as it extends backward. Therefore, the stepped portion 21D allows the air flowing inside the bottom plate 22 to go upward, while the air under the bottom plate 22 reaches the rear along the surface of the first guide wall 21C located at a higher position.

A concave surface 49 extending in the longitudinal direction and recessed inward is formed on the side of the bottom plate 22 . The concave surface 49 easily forms another air introduction path and prevents the air in this air introduction path from mixing with the air in another air introduction path.

The concave surface 49 is formed adjacent to the side wall 21A in the upper region of the lower surface of the bottom plate 22 . The stepped portion is provided by the protrusion 50 formed between the surface of the side wall 21A located in the upper region and the concave surface 49 . Thereby, mixing with air in another air introduction path can be further prevented.

Prime mover 29 includes engine 25 and discharge pipe 39 extending rearwardly from engine 25 . The discharge pipe 39 extends toward the rear of the first guide wall 21C, which is the bottom wall of the bottom plate 22 and is located at a higher position. The discharge pipe 39 directs the air under the floor 22 to cool the discharge pipe 39, which is less affected by mud and water. Thus, the discharge duct 39 is effectively cooled while directing most of the air that has passed inside the bottom plate 22 to another area.

The prime mover 29 includes the engine 25 , and an oil tank 54 is formed at the lower part of the engine 25 . At least a part of the oil tank 54 is arranged behind the second guide wall 21E which is the bottom wall of the bottom plate 22 and is located at a lower position. In this arrangement, the air is led to the oil tank 54 whose temperature tends to rise. The prime mover 29 includes the engine 25 and an intake port 25A of the engine 25 arranged behind the bottom plate 22 and above the upper surface of the bottom plate 22 . In this arrangement, relatively clean air that has passed inside the floor 22 is directed upwards and supplied to the engine 25 . The prime mover 29 includes the power transmission device 27 . An intake port 27A for introducing air to cool the inside of the power transmission device 27 is arranged behind the bottom plate 22 and above the upper surface of the bottom plate 22 . In this arrangement, relatively clean air that has passed through the inside of the bottom plate 22 is directed upward and supplied to the inside of the power transmission device 27 .

The prime mover 29 includes a fan for cooling the prime mover 29 with air. The intake port 45 of the fan is arranged behind the concave surface 49 of the bottom plate 22 . In this arrangement, air for cooling the prime mover 29 can be secured.

The intake port 45 of the fan opens leftward or rightward in the lateral direction. There is provided an air introduction wall 33 disposed at least rearwardly and downwardly of the intake port 45 and projecting in the lateral direction. The air introduction wall 33 guides the air flowing along the concave surface 49 to the fan.

A duct as a space formed between the rear leg shield 17B and the inner cover 19 becomes the front area of the air introduction path 43 . In FIG. 1 , the front upper end 19A of the inner cover 19 extends toward the middle portion of the leg shield 17 . In FIG. 7, the front upper end 19A is close to or contacts the middle portion of the rear leg shield 17B. In Figures 5 and 8, the inlet 55 is positioned slightly below the front upper end 19A. In this arrangement, air can be efficiently introduced. Because the front upper end 19A is close to or contacts the middle portion of the rear leg guard 17B, the front wheel Wf is positioned closer to the inner cover 19 than is the case with conventional scooters.

The openings 57 have a predetermined width D between each other in the longitudinal direction of the inner cover 19 . The inner cover 19 has a plurality of opening forming members 59 extending long in the lateral direction. Furthermore, the slope of the opening forming member 59 rises toward the front of the inner cover 19 . In this arrangement, the upward movement of mud and water splashed by the front wheels Wf is prevented.

Industrial applicability

The ducts of the pedals included in the motorcycle according to the invention lead air to the prime mover of the motorcycle. As such, this pedal is useful in terms of its ability to cool the prime mover of the motorcycle.

The present invention is not limited to the embodiments described here, but modifications and variations possible to the level of knowledge of a person skilled in the art are possible.

The specification of Japanese Patent Application No. 2003-060409 (filed on March 6, 2003) is incorporated herein by reference.

Claims (18)

1. A motorcycle, comprising: a frame including a first frame portion extending in a vertical direction of the motorcycle, and a second frame extending rearward from a lower area of the first frame in a longitudinal direction of the motorcycle part; a front cover covering the first frame portion; a floor covering said second frame portion, extending rearwardly from a lower area of said front cover, and having an upper surface as a surface on which a driver's foot can be placed; a prime mover disposed in the rear region of the floor in the longitudinal direction to drive the motorcycle; and an air inlet provided on the front area of said motorcycle, wherein: a stepped portion extending in the longitudinal direction is provided on a lower surface of the bottom plate; An upper guide surface and a lower guide surface are provided on the lower surface of the bottom plate, the upper guide surface and the lower guide surface are arranged side by side with each other in the lateral direction of the motorcycle and are positioned on the lower surface due to the stepped portion. vertically positioned at different levels; and Air is introduced through the inlet and directed through the interior of the floor to the prime mover. 2. The motorcycle according to claim 1, wherein said lower guide surface has a rear end extending downward in said vertical direction. 3. The motorcycle according to claim 1, said lower guide surface extending further rearward in said longitudinal direction than said upper guide surface. 4. The motorcycle according to claim 1, wherein the stepped portion is enlarged as it extends rearward in the longitudinal direction. 5. The motorcycle according to claim 1, wherein the bottom plate includes side surfaces to form a concave surface extending in the longitudinal direction and concave toward an inner side. 6. The motorcycle of claim 5, wherein: the concave surface is formed adjacent to the upper guide surface; and A protrusion protruding to the outside is provided between the upper guide surface and the concave surface. 7. The motorcycle of claim 1, wherein: the prime mover includes an engine and a discharge pipe extending rearwardly from the engine in the longitudinal direction; and The discharge pipe extends toward the rear of the upper guide surface in the longitudinal direction. 8. The motorcycle of claim 1, wherein: said prime mover includes an engine, an oil tank is provided on a lower portion of said engine; and At least a part of the oil tank is arranged behind the lower guide surface in the longitudinal direction. 9. The motorcycle of claim 1, wherein: the prime mover includes an engine and an air filter connected to the engine; and The intake port of the air cleaner is arranged behind the bottom plate in the longitudinal direction and above the upper surface of the bottom plate in the vertical direction. 10. The motorcycle of claim 1, wherein: said prime mover includes power transmission equipment; The power transmission device has an intake port arranged behind the base plate in the longitudinal direction and above the upper surface of the base plate in the vertical direction; and The intake port introduces air to cool the inside of the power transmission device. 11. The motorcycle of claim 5, wherein: the prime mover includes a fan that uses air to cool the prime mover; and The intake port of the fan is arranged behind the concave surface of the bottom plate in the longitudinal direction. 12. The motorcycle of claim 11, wherein: an intake port of the fan opens in the lateral direction; and The prime mover includes an air introduction wall disposed at least behind the intake port in the longitudinal direction and below the intake port in the vertical direction, and at least in the longitudinal direction. convex in the lateral direction. 13. The motorcycle of claim 1, wherein: The front cover portion includes a rear cover portion for covering the vehicle frame from behind in the longitudinal direction, and a front cover portion for covering the vehicle frame from the front in the longitudinal direction; the inlet is formed on the front cover portion; and Air is directed through the space between the front cover portion and the rear cover portion to the floor. 14. A motorcycle comprising: prime mover; and a foot pedal for introducing air to said prime mover; wherein: said footboard includes a footrest, a cover for covering said footrest, and a duct formed by said footrest and said cover; the cover includes a wall opposite the footrest; The wall includes a first wall and a second wall extending side by side in the lateral direction along the duct, and a partition for providing a step between the first wall and the second wall. part, so that air is supplied separately to the first wall and the second wall. 15. The motorcycle according to claim 14, wherein the partition portion extends along the duct so that a large stepped portion can be provided between the first wall and the second wall. 16. The motorcycle of claim 14, wherein at least one of the first wall and the second wall includes an end having a vent lattice near the prime mover. 17. The motorcycle of claim 14, wherein one of the first and second walls extends further than the other of the first and second walls. 18. The motorcycle of claim 14, further comprising: A cover for forming a duct communicating with said duct of said footrest; wherein said cover has an inlet for introducing air into said duct.

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