JP2001097272A - Scooter type motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scooter type motorcycle having an unimpaired riding comfortableness and steerability in spite of the fact that the gravity center of an engine is positioned in the front of the motorcycle. SOLUTION: In this scooter type motorcycle 1, a rise part 30 rising to a head pipe 3 is formed ahead of a foot passing space 22, a crankshaft 29 is disposed on the lower side of the rise part 30 generally parallel with the longitudinal centerline of a body 1 and an engine 7 is mounted, and a drive shaft 37 and a driven shaft 39 of a transmission 35 installed at the rear of the engine 7 integrally with each other and the crankshaft 29 are disposed to lower toward the front so as to be generally parallel with a footless floor 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scooter type motorcycle.

[0002]

2. Description of the Related Art In recent years, it has been difficult to apply a conventional method of attaching a swing-type engine unit, which integrates an engine and a power transmission unit, to a vehicle body so that the scooter-type motorcycle can be swingably mounted on the vehicle body due to the enlargement of the vehicle body and the engine. It is becoming. The reason for this is that as the size of the engine increases, the length of the engine unit increases, the overall length of the vehicle increases, and the center of gravity of the vehicle shifts backward, increasing unsprung weight and increasing the shared weight of the rear wheels. This is because the steerability decreases due to an increase or the like.

In recent years, therefore, there has been a scooter-type motorcycle in which the engine body is fixed to the vehicle body and only the power transmission portion is swingably mounted on the vehicle body so that the engine body can be arranged closer to the front of the vehicle body (for example, see Japanese Patent Laid-Open Publication No. H11-163873). Kaihei 11
129969).

[0004]

However, in the scooter type motorcycle, the front of the driver's seat is largely downward and substantially U-shaped.
Since it has a unique external shape that forms a foot space that extends in the width direction of the vehicle body by being curved in the shape of a letter, if the engine body is arranged near the front of the vehicle body, there is a possibility that the engine body will interfere with the foot space.

[0005] In particular, when the cylinders are arranged in a parallel multi-cylinder configuration with an increase in the size of the engine, the cylinders interfere with the footrest floor formed at the bottom of the foot space for the occupant to put his / her feet on, and provide a comfortable ride. Affects maneuverability.

The present invention has been made in consideration of the above circumstances, and has as its object to provide a scooter-type motorcycle which does not impair riding feeling and maneuverability while arranging the center of gravity of the engine forward.

[0007]

In order to solve the above-mentioned problems, a scooter-type motorcycle according to the present invention supports a front fork for supporting a front wheel so as to be steerable left and right. A footrest in which a vehicle body between a head pipe and an occupant's seat for driving is curved downward in a substantially U-shape to form a footing space extending in the width direction of the vehicle body, and occupants' feet on the left and right of a bottom portion thereof. A scooter-type motorcycle in which a floor is formed to fall forward and a tunnel shape protruding upward and forward and backward is formed at a center portion of the footrest floor, and a rising portion rising toward the head pipe in front of the foot space. The crankshaft is arranged at the lower part of this rising part so as to be substantially parallel to the center line in the traveling direction of the vehicle body, and the engine is mounted. Rutotomoni, so that the drive shaft and the driven shaft and the crank shaft of the transmission device provided integrally with the rear portion of the engine to be parallel the footrest floor and substantially, but disposed forwardly downwards.

According to another aspect of the present invention, the transmission is a V-belt type automatic transmission, wherein the drive shaft having a drive pulley and the driven pulley are connected to each other. The driven shaft provided is juxtaposed in the vehicle width direction, a V-belt is stretched between both pulleys, and the center of the crankshaft, the drive shaft and the driven shaft are aligned with the center of the crankshaft in front view of the engine. It is arranged above the line connecting the centers of the drive shaft and the driven shaft.

Further, in order to solve the above-mentioned problems,
As described in claim 3, a starting clutch device is arranged offset in the vehicle width direction of the vehicle body behind the transmission to form an L-shaped space in a center lower part of the vehicle body in plan view, and a fuel tank is provided in this space. Is arranged at the bottom.

Further, in order to solve the above-mentioned problem, as described in claim 4, an article storage chamber is arranged above the fuel tank.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a left side view showing an example of a scooter type motorcycle to which the present invention is applied. FIG. 2 is a left side view showing the internal structure of the motorcycle. As shown in FIGS. 1 and 2, the scooter type motorcycle 1 has a body frame 2, and a head pipe 3 is provided at a front end of the body frame 2. The head pipe 3 is provided with a front fork 5 and a handlebar 6 for rotatably supporting the front wheel 4.
Is steerably pivotable left and right.

An engine 7 is provided at the lower center of the body frame 2.
Is mounted and fixed. A propeller shaft housing 8 is disposed at a rear portion of the engine 7, and a front portion of the propeller shaft housing 8 is pivotally connected to a pivot portion 9 provided on the vehicle body frame 2 via a link 10 so as to be swingable.

The propeller shaft housing 8 also serves as a swing arm, and is elastically and swingably supported on the vehicle body frame 2 by a shock absorber 11. Then, a rear wheel 12 as a driving wheel is held at a rear end of the propeller shaft housing 8.

An engine intake system device 13 and an engine exhaust system device 14 are connected to the engine 7. Above the rear wheel 12, a rear article storage chamber 15 for storing a helmet, luggage, tools and the like (not shown) is provided. An article storage room 18 is provided.

Further, an operation seat 19 for seating an occupant, which also serves as a lid for the article storage chambers 15 and 18, is provided above the article storage chambers 15 and 18 so as to be openable and closable. A fuel tank 20 is arranged below the chamber 18. The body frame 2 is covered by, for example, a body cover 21 which is a synthetic resin molded product.

The vehicle body frame 2 and the vehicle body cover 21 between the head pipe 3 and the front portion of the driving seat 19 are largely curved downward and substantially U-shaped to form a foot space 22 extending in the width direction of the vehicle body 1. A low footrest floor 23 on which the occupant places his / her feet on the left and right sides of the bottom is formed to be lowered forward. At the center of the footrest floor 23, a tunnel shape 24 that projects upward and extends back and forth is formed.

FIG. 3 is a plan view of the motorcycle 1 shown in FIGS. 1 and 2. The engine 7 and the propeller shaft housing 8 are shown in a sectional view along the line III-III in FIG. (Two-dot chain line). further,
FIG. 4 is an enlarged plan sectional view of the engine 7 shown in FIG. FIG. 5 is a front view of the engine 7 (a view as seen from the arrow 5 in FIG. 2).

As shown in FIGS. 2, 3, 4 and 5, the engine 7 is mainly composed of an engine case 25 and a cylinder 26, and the reciprocating motion of a piston 27 in the cylinder 26 is controlled by the engine via a connecting rod 28. Case 25
The crankshaft 29 inside is rotated. The engine 7 is a so-called V-type (or L-type) engine in which two cylinders 26 sharing one crankshaft 29 are arranged at an included angle of 180 ° or less when viewed from the front. The crankshaft 29 of the engine 7 is disposed below a rising portion 30 rising toward the head pipe 3 in front of the foot space 22 and substantially parallel to the center line 31 in the traveling direction of the vehicle body 1. 30
Left and right cylinders 26 are arranged on an engine case 25 inside. Further, an oil pan 32 is arranged below the crankshaft 29 of the engine case 25.

On the other hand, in a space formed between the cylinder 26 and the head pipe 3, for example, an air cleaner case 13a constituting the engine intake system device 13 is disposed.
The intake pipe 13b and the carburetor 13c are connected to each cylinder 26 from the air cleaner case 13a. On the other hand, an exhaust pipe 14a constituting the engine exhaust system device 14 is connected to the lower surface of each cylinder 26 and extends rearward, and a muffler 14b is connected to its downstream end.

The engine 7 mounted on the motorcycle 1 is of a water-cooled type, and is provided with a radiator 33 for cooling the cooling water. The radiator 33 is arranged, for example, in the vehicle body cover 21 between the front wheel 4 and the front part of the engine 7.

A transmission chamber 34 is formed at the rear of the engine case 25, and a V-belt type automatic transmission 35 is disposed in the transmission chamber 34. The transmission 35 includes a drive pulley 36 and the above-described crankshaft 2.
9 and a driven shaft 39 provided with a driven pulley 38. The drive shaft 37 is provided on the rear side of the crankshaft 29 in parallel with the crankshaft 29, and They are arranged offset in the width direction.

A driven shaft 39 is arranged in parallel with the drive shaft 37 on the side of the drive shaft 37 in the vehicle width direction, on the opposite side of the crankshaft 29. The crankshaft 29, the drive shaft 37, and the driven shaft 39 are arranged at the front downward so as to be substantially parallel to the footrest floor 23.

Further, as shown in FIG. 5, when the engine 7 is viewed from the front, the positional relationship between these shafts is determined by the line 40 connecting the center of the crankshaft 29 to the center of the drive shaft 37 and the center of the driven shaft 39. It is arranged to be on the upper side.

A drive gear 41 is provided at one end, for example, the right end of the crankshaft 29, and a driven gear 42 is provided at one end, for example, the right end of the drive shaft 37. These gears 41, 42 are operatively connected to each other to form a crankshaft. The rotation of 29 is transmitted to the drive shaft 37. A V-belt 43 is stretched between the drive pulley 36 and the driven pulley 38, and the rotational driving force of the engine 7 is transmitted to the driven pulley 38 via the V-belt 43.

Mission room 3 behind engine case 25
A start clutch device 44 is provided at the rear of 4. The starting clutch device 44 is arranged to be offset in the vehicle width direction of the vehicle body 1, for example, to the left, and its input shaft 45 is connected to the transmission 35.
Is connected to the rear end of the driven shaft 39.

The rotational driving force of the engine 7 transmitted to the starting clutch device 44 is transmitted to the axle shaft 48 of the rear wheel 12 via the output shaft 46 via the propeller shaft 47. The propeller shaft 47 is a front shaft 47a.
And the rear shaft 47b is divided into two parts and is disposed in the propeller shaft housing 8, and is also parallel to the center line 31 in the traveling direction of the vehicle body 1 and in the vehicle width direction of the vehicle body 1,
For example, they are arranged offset to the left.

Front shaft 47 of propeller shaft 47
a is disposed near the rear end of the output shaft 46 of the starting clutch device 44 in parallel with the output shaft 46, and is operatively connected via a gear 49. The front shaft 47a and the rear shaft 47b of the propeller shaft 47 are connected by, for example, a universal joint 50.

Further, the axle shaft 48 is arranged near the rear end of the rear shaft 47b, and the rotation of the propeller shaft 47 is converted through the bevel gear 51 by 90 ° and transmitted to the axle shaft 48.

By disposing the starting clutch device 44 in the vehicle width direction of the vehicle body 1 behind the transmission chamber 34 at the rear of the engine case 25, as shown in FIG. A lower portion of the fuel tank 20 is disposed in the driving seat 19, that is, in this space below the front article storage chamber 18. The upper portion of the fuel tank 20 extends forward and overhangs above the mission chamber 34, as shown in FIG.

Next, the operation of the present embodiment will be described.

By arranging the crankshaft 29 below the rising portion 30 in front of the foot space 22, the engine 7 is further attached to the front wheels 4 as compared with a conventional motorcycle described in, for example, Japanese Patent Application Laid-Open No. 11-129969. Can be placed in close proximity. As a result, the load shared by the front and rear wheels of the vehicle can be equally shared between the front wheels 4 and the rear wheels 12, and the sharing ratio becomes ideal, thereby improving the steering stability.

Further, by disposing the crankshaft 29 downward, the cylinder 26 on the engine case 25 can be tilted forward.
2 can be formed widely in the front and rear directions, so that the straddling property at the time of getting on and off the vehicle is improved.

Further, by arranging the drive shaft 37 and the driven shaft 39 of the transmission 35 at the lower front, the minimum ground clearance at the center of the vehicle body 1 is increased. As a result, the height at which a person can cross over a step or the like increases.

Then, a transmission chamber 34 containing a drive shaft 37 and a driven shaft 39 is disposed behind the engine case 25 containing the crankcase 25, and the drive shaft 37 and the driven shaft 39 are disposed lower than the crankshaft 29. Thereby, the protrusion of the tunnel shape 24 formed at the center of the footrest floor 23 can be reduced, and the area of the footrest floor 23 increases.

On the other hand, by disposing the crankshaft 29 higher than the drive shaft 37 and the driven shaft 39, a large capacity of the oil pan 32 below the crankshaft 29 can be ensured, and the durability and reliability of the engine 7 are improved.

Further, a starting clutch device 44 is arranged behind the transmission chamber 34 at the rear of the engine case 25 in the vehicle width direction of the vehicle body 1 so as to be positioned at the center lower portion of the vehicle body 1 in plan view L
By forming a space 52 in a U-shape and arranging the fuel tank 20 which is heavy (particularly when fully loaded) in this space 52,
The body 1 has a low center of gravity, and steering stability and riding comfort are improved.

Further, since the height (ground height) of the fuel tank 20 is reduced by disposing the fuel tank 20 in the above-described L-shaped space 52, the article storage room (in this embodiment, Can arrange the front article storage room 18), and a large capacity can be secured. In addition, the height of the seating surface of the driving seat 19 can be reduced.

[0039]

As described above, according to the scooter type motorcycle according to the present invention, the front pipe for supporting the front wheel is steerably supported to the left and right and the driving seat for occupant seating. The vehicle body is bent downward in a substantially U-shape to form a foot space extending in the width direction of the vehicle body, and a footrest floor on which the occupant rests on the left and right of the bottom is formed at the front downward, and the center of the footrest floor is formed. In the scooter type motorcycle in which a tunnel shape is formed to protrude upward and extend forward and backward, a rising portion which rises toward the head pipe is formed in front of the foot space, and a lower portion of the rising portion is provided with the vehicle body. The engine is mounted with the crankshaft arranged so as to be substantially parallel to the center line in the traveling direction. The drive shaft and driven shaft of the transmission and the crankshaft are arranged at the front downward so as to be substantially parallel to the footrest floor, so that the foot space is extended back and forth, and the straddling property at the time of getting on and off is improved, and The minimum ground clearance in the center is also higher, and steering stability is also improved.

The transmission is a V-belt type automatic transmission, wherein the drive shaft having a drive pulley and the driven shaft having a driven pulley are arranged side by side in the vehicle width direction. The V-belt is stretched and the center of the crankshaft is located above the line connecting the centers of the drive shaft and the driven shaft in a front view of the engine. The size of the floor is increased and the rideability is improved, and a large capacity of the oil pan below the crankshaft can be secured.

Further, a starting clutch device is arranged behind the transmission in the vehicle width direction of the vehicle body to form an L-shaped space in the center lower portion of the vehicle body, and a lower portion of the fuel tank is disposed in this space. As a result, the vehicle body has a lower center of gravity, and steering stability and riding comfort are improved.

Further, since the article storage chamber is arranged above the fuel tank, a large capacity can be ensured and the height of the seating surface of the operation seat can be reduced.

[Brief description of the drawings]

FIG. 1 is a left side view showing an embodiment of a scooter type motorcycle according to the present invention.

FIG. 2 is a left side view showing the internal structure of the motorcycle shown in FIG.

FIG. 3 is a plan view of the motorcycle shown in FIGS. 1 and 2, wherein an engine and a propeller shaft housing are shown in FIG.
Sectional drawing which follows the III-III line.

FIG. 4 is an enlarged plan sectional view of the engine shown in FIG. 3;

FIG. 5 is a front view of the engine (a view as seen from the arrow 5 in FIG. 2).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scooter type motorcycle (body) 3 Head pipe 4 Front wheel 5 Front fork 7 Engine 15 Rear article storage room 18 Front article storage room 19 Operating seat 20 Fuel tank 21 Body cover 22 Foot space 23 Footrest floor 24 Tunnel shape 29 Crank Shaft 30 Rising part 31 Center line of traveling direction of vehicle body 35 V-belt type automatic transmission 36 Drive pulley 37 Drive shaft 38 Driven pulley 39 Driven shaft 43 V-belt 44 Starting clutch device 47 Propeller shaft 52 L-shaped space

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F02B 61/02 F02B 61/02 D 67/00 67/00 D

Claims (4)

[Claims] 1. A vehicle body between a head pipe for supporting a front fork for supporting front wheels so as to be steerable left and right and a driving seat for seating an occupant is bent downward in a substantially U-shape and extends in the width direction of the vehicle body. A scooter-type automatic that has a footing space, a footrest floor on which the occupant rests on the left and right of the bottom, is formed at the front downward, and a tunnel shape is formed at the center of this footrest floor to protrude upward and extend back and forth. In the motorcycle, a rising portion 3 rising toward the head pipe 3 in front of the foot space 22.
0, and the lower part of the rising portion 30 is
The engine 7 is mounted with the crankshaft 29 disposed so as to be substantially parallel to the center line 31 in the traveling direction of the engine 7. The drive shaft 37 and the driven shaft 39 of the transmission 35 integrally provided at the rear of the engine 7 Connect the crankshaft 29 to the footrest floor 2
A scooter-type motorcycle characterized in that it is arranged on the front downward so as to be substantially parallel to 3. 2. The transmission 35 is a V-belt type automatic transmission in which the drive shaft 37 provided with a drive pulley 36 and the driven shaft 39 provided with a driven pulley 38 are arranged side by side in the vehicle width direction. And both pulleys 3
A V-belt 43 is stretched between the shafts 6 and 38, and the center of the crankshaft 29 is aligned with the drive shaft 37 and the driven shaft 39 when the crankshaft 29, the drive shaft 37 and the driven shaft 39 are viewed from the front of the engine 7. The scooter-type motorcycle according to claim 1, wherein the motorcycle is disposed above a line 40 connecting the centers. 3. A starting clutch device 44 is arranged behind the transmission 35 in the vehicle width direction of the vehicle body 1 to form an L-shaped space 52 in a central lower portion of the vehicle body 1 in a plan view. The scooter type motorcycle according to claim 1 or 2, wherein a lower portion of the fuel tank (20) is disposed. 4. The scooter-type motorcycle according to claim 3, wherein an article storage chamber is disposed above the fuel tank.