JP4506317B2 - Motorcycle - Google Patents

Description

  The present invention relates to a motorcycle having a foot space between a driver's seat and a head pipe.

  Conventionally, in a motorcycle generally referred to as an underbone type, a vehicle body portion such as a vehicle body cover and a vehicle body frame is bent downward between a driver's seat and a head pipe to form a foot-through space. It is easy to straddle. However, since the engine is mounted almost horizontally and the cylinder head is located at a low position immediately after the front wheel, the muddy water and pebbles that the front wheel jumps up easily hits the cylinder head, and mud accumulates in the cooling fins of the cylinder head. If this happens, there is a risk of overheating.

  In order to prevent this, in the motorcycles of Patent Documents 1 and 2 below, a large front fender is provided, and the rear part of the front fender is extended to the vicinity of the lower part of the engine so as to cover the cylinder head from the front.

  In addition, in this main motorcycle, the down tube is not arranged below the engine, and it is difficult to attach an under guard that protects the lower part of the engine, so if the lower part of the engine is exposed, There is a risk of damage to the engine, dirt, deterioration of cooling performance, etc. due to contact with unevenness or splashing of muddy water splashed by the front wheels. In addition, when traveling on rough roads, the engine or the vehicle body is easily caught by road surface irregularities, obstacles such as rocks and stubs protruding from the road surface, and the ride over is also poor.

In consideration of such a situation, in the motorcycles of Patent Documents 1 and 2 below, an under guard (an engine guard or an under cover) is attached to the crankcase.
Japanese Patent Laid-Open No. 9-242630 JP-A-9-175465

  However, the motorcycles of Patent Documents 1 and 2 have a problem in that the capacity of the air cleaner box disposed behind the front wheels is restricted due to the long rear part of the front fender.

  Further, the under guard only protects the crankcase. For example, the cylinder head is covered only by the rear portion of the large front fender, and the lower portion is not protected. Therefore, there is a problem that the engine unit including the cylinder head is not sufficiently protected against road surface unevenness and muddy water that the front wheel jumps up.

  Further, in the motorcycles of Patent Documents 1 and 2, since the under guard does not cover the arm portion of the footrest, the arm portion protrudes downward, and there is a problem that the riding over property on bad roads is poor. It was.

The present invention has been made in order to solve the above-purpose of that is, while securing the straddling easiness and protection of the front cylinder head during getting on and off, ensure a large volume of the air cleaner box The object is to provide a motorcycle that can.

In order to achieve the first object, the motorcycle according to claim 1 of the present invention is a front fork in which a handlebar (15) is attached to an upper end portion and a front wheel (17) is rotatably supported at a lower end portion. (14), a head pipe (13) that rotatably supports the front fork, and a down tube (11) that is formed to be substantially horizontal after extending obliquely downward from the head pipe toward the rear. A driver seat (19) provided substantially in the center of the vehicle longitudinal direction, a foot-through space (S1) formed between the driver seat and the head pipe, an engine case, a cylinder (32) and a cylinder An engine unit (30) having a head (31) and disposed substantially horizontally in the front-rear direction so that the cylinder head is located on the front side below the foot passage space Has an air cleaner box (21), an intake device disposed between the cylinder and the front end portion of the down tube of the engine unit to a rear of the front wheel (11a), said cylinder of said engine unit An exhaust pipe connected to a lower portion of the head and extending rearwardly through the cylinder head and the cylinder, and a mounting portion, and the mounting portion is mounted on the bottom wall of the engine case of the engine unit. in a motorcycle including a footrest, the extending, the vehicle body cover provided to cover at least the intake system from the top and sides, covering the front wheel is attached to the front fork from above, the rear part the air cleaner It overlaps with the box in the vertical direction and A front fender edge is formed and higher than the lower end position located lower than the upper end position of the air cleaner box, an engine underguard covering from the front and lower the cylinder head of at least the engine unit, a front portion of the air cleaner box A mud guard (23) extending downward from the lower portion to cover the cylinder head of the engine unit from the front and extending to the vicinity of the front upper edge of the engine under guard .

  According to the motorcycle of the first aspect of the present invention, the cylinder head is covered from the front by the mud guard provided in the air cleaner box, so that the rear part of the front fender can be shortened. A large volume of the air cleaner box can be secured while securing the part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a right side view of a motorcycle according to an embodiment of the present invention. FIG. 2 is a right side view of the main part of the motorcycle according to the present embodiment.

  As shown in FIG. 1, the motorcycle has a head pipe 13 at the upper front part of the vehicle body, and a front fork 14 is rotatably inserted into the head pipe 13. A handlebar 15 is attached to the upper end of the front fork 14, and a front wheel 17 is rotatably supported on the lower end. A front fender 16 is attached to the front fork 14 below the head pipe 13, and the front fender 16 covers the front wheel 17 from above.

  The frame structure of the motorcycle is a so-called underbone type, and the down tube 11 extends from the head pipe 13 obliquely downward toward the rear, and is curved so as to be substantially horizontal. A rear frame 12 is connected to the rear end portion of the down tube 11. The rear frame 12 extends upward rearward and gradually becomes substantially horizontal. A driver seat 19 is provided approximately in the center of the vehicle longitudinal direction, and a fuel tank 22 is disposed below the driver seat 19.

  A vehicle body cover 20 that covers the down tube 11 and the rear frame 12 is also provided. Between the driver's seat 19 and the head pipe 13, a foot-through space S <b> 1 that is curved downward in a side view shape is formed to ensure ease of straddling when getting on and off.

  A rear arm bracket 27 is pivotally attached to a pivot 26 provided at a lower end portion of the front portion of the rear frame 12, and a rear wheel 18 is rotatably supported at a rear end portion of the rear arm bracket 27. The rear arm bracket 27 and the rear wheel 18 are suspended from the rear frame 12 via a cushion unit 28.

  Further, as shown in FIG. 2, an engine unit 30 having a cylinder head 31, a cylinder 32, an engine case 33, and the like is provided below the foot-through space S1. The engine unit 30 is disposed substantially horizontally in the front-rear direction so that the cylinder 32 extends forward and the cylinder head 31 is located on the front side. The engine unit 30 is an air-cooled engine, and cooling fins are provided on the outer surface of the cylinder 32 and the outer surface of the cylinder head 31, respectively.

  As shown in FIG. 1, an air intake device having an air cleaner box 21 and a carburetor 34 connected to the air cleaner box 21 is located behind a front wheel 14 between a cylinder 32 of an engine unit 30 and a front end portion 11 a of a down tube 11. Arranged between. The intake device is covered with a front portion 20a of the vehicle body cover 20 from above and from the side. The carburetor 34 is disposed immediately above the cylinder head 31 and is connected to the upper portion of the cylinder head 31 via an intake pipe 38.

  The air cleaner box 21 is located slightly above the carburetor 34 and covers the carburetor 34 from the front. A mud guard 23 is suspended from the front lower portion of the air cleaner box 21. The mud guard 23 is formed integrally with the air cleaner box 21 for simplification of the configuration, but may be configured separately.

  As shown in FIGS. 1 and 2, a brake pedal 25 is disposed on the lower right side of the engine unit 30. An exhaust pipe 35 is connected to the lower surface of the cylinder head 31. The exhaust pipe 35 extends rearward on the right side of the vehicle body, and the exhaust muffler 24 is connected to the downstream side thereof. A footrest 60 described later is attached to the lower part of the engine case 33.

  The lower part of the engine unit 30 is covered with an engine under guard (hereinafter simply referred to as “under guard”) 40 described later. The mutual positional relationship between the upper edge 40aa of the front portion 40a of the underguard 40, the rear portion 16a of the front fender 16, the front upper position 21a of the air cleaner box 21, and the lower position 23a of the mud guard 23 will be described later.

  FIG. 3 is an exploded perspective view of the under guard 40 and the footrest 60. FIG. 4 is a bottom view of the underguard 40.

  As shown in FIGS. 3 and 4, the footrest 60 is provided with footrests 63 </ b> L and 63 </ b> R at both ends of a bar-shaped arm 61 extending in the left-right direction, and is attached to the engine case 33 at a substantially center of the bar-shaped arm 61. A mounting plate 62 is formed integrally. The mounting plate 62 is fixed to the bottom wall of the engine case 33 with four bolts 64 </ b> A to 64 </ b> D from below so that the footrest 60 is fixed to the engine case 33. A shift pedal 37 is attached to the left part of the bar-shaped arm 61 of the footrest 60 (see FIG. 4).

  The under guard 40 is formed integrally with a front portion 40a in a slightly bag shape and a rear portion 40b in a substantially plate shape. As shown in FIGS. 1 and 2, the front portion 40a is the lower half of the front portion of the cylinder head 31. The front part 40a to the rear part 40b are configured to sufficiently cover the cylinder head 31, the cylinder 32, and the rear part of the engine case 33.

  As shown in FIGS. 3 and 4, attachment pieces 41 </ b> L and 41 </ b> R for attachment to the cylinder 32 are formed on the left and right sides of the front portion 40 a of the underguard 40. A pair of left and right brackets 44L and 44R are fixed inside the mounting pieces 41L and 41R with bolts 48L and 48R. At that time, the bolts 48L and 48R are fixed via spacers 47L and 47R and cushions 46L and 46R made of an elastic body such as rubber, respectively. Thereby, the front part 40a of the under guard 40 is in a floating state with respect to the brackets 44L and 44R. The brackets 44L and 44R are attached to the left and right sides of the cylinder 32 with bolts 45L and 45R, so that the front portion 40a of the underguard 40 is fixed to the cylinder 32 in a floating state. Note that the front portion 40 a of the underguard 40 may be configured to be attached to the cylinder head 31 instead of the cylinder 32.

  On the other hand, mounting bosses 43L and 43R are integrally formed on the rear portion 40b of the underguard 40. In FIG. 2, only the right mounting boss 43R is shown. These mounting bosses 43L and 43R are recessed upward, and when viewed from the lower surface of the underguard 40, recesses 65L and 65R are formed at corresponding positions (see FIGS. 2 and 4). Then, the mounting plate 62 of the footrest 60 is positioned on the upper surfaces of the mounting bosses 43L and 43R, and the mounting bosses 43L and 43R and the mounting plate 62 are placed on the bottom wall of the engine case 33 from below the mounting bosses 43L and 43R. Fasten together.

  At that time, the bolts 51L and 51R are fixed via spacers 50L and 50R and cushions 51L and 51R made of an elastic body such as rubber, respectively. Thereby, the rear part 40b of the under guard 40 is fixed to the engine case 33 in a floating state. In addition, after the screwing of the bolts 51L and 51R is completed, the spacers 50L and 50R and the cushions 51L and 51R are buried in the recesses 65L and 65R together with the bolts 51L and 51R. It does not protrude. Moreover, since the under guard 40 also covers the attachment plate 62 of the footrest 60 from below, the attachment plate 62 does not protrude downward from the lower surface of the under guard 40. The same is true because the front portion of the exhaust pipe 35 is also covered with the under guard 40.

  In this way, the under guard 40 is fixed to the engine unit 30 in a floating state. By the way, as shown in FIG. 2, a gap is provided between the cylinder head 31 and the cylinder 32 and the under guard 40, and this gap serves as a cooling air passage S2. Further, an exhaust port 36 for discharging cooling air passing through the cooling air passage S2 is provided in the vicinity of the rear portion of the cylinder 32 so as to communicate with the cooling air passage S2, and the engine unit 30 is provided while the under guard 40 is provided. The cooling performance is ensured.

  The under guard 40 covers the cylinder head 31, the cylinder 32, the engine case 33, the front part of the exhaust pipe 35, and the mounting plate 62 of the footrest 60 from below, so that muddy water, pebbles, and the like that the front wheel 17 jumps up against them. Avoid that and protect them. The under guard 40 also covers the mounting plate 62 from below, so that the lower protrusion of the engine case 33 is eliminated, and the under guard 40 acts like a skid plate. The vehicle body is less likely to be caught by unevenness, obstacles such as rocks and stumps protruding from the road surface, and the ride-over performance is improved.

  By the way, as shown in FIG. 1, the front edge 16ab and the rear edge 16aa of the rear part 16a of the front fender 16 are formed substantially horizontally, and the rear part 16a is shorter than a general front fender. Thereby, since the arrangement space of the air cleaner box 21 is not compressed, the air cleaner box 21 can be arranged close to the rear portion 16a of the front fender 16, which is advantageous for securing the volume of the air cleaner box 21. This also contributes to reducing the size and weight of the front fender 16.

Further, the rear portion 16a of the front fender 16 overlaps the air cleaner box 21 in the vertical direction, and the height relationship indicates that the position of the rear end edge 16aa of the rear portion 16a is higher than the front upper end position 21a of the air cleaner box 21. It is lower and higher than the lower end position . Thereby, it is avoided that the muddy water flowing along the inner surface of the front fender 16 flows backward from the upper surface or the upper surface of the air cleaner box 21, and the muddy water or the like enters the air cleaner box 21.

  As shown in FIGS. 1 and 2, the mud guard 23 extends to the vicinity of the upper end edge 40aa of the front portion 40a of the underguard 40, and the lower end position 23a of the mud guard 23 is close to the upper end edge 40aa. And it is lower than the upper edge 40aa. Thereby, the upper half part of the front part of the cylinder head 31 is covered with the mud guard 23 from the front. Therefore, the mud guard 23 covers the front part of the cylinder head 31 in cooperation with the front part 40 a of the under guard 40 that covers the lower half part of the front part of the cylinder head 31, and thereby travels along the inner surface of the front fender 16. The flowing muddy water and the earth and sand that the front wheel 17 jumps up are less likely to adhere to the front part of the cylinder head 31 or the cylinder 32.

  According to the present embodiment, since the under guard 40 that covers the cylinder head 31, the cylinder 32, the engine case 33, the front part of the exhaust pipe 35, and the mounting plate 62 of the footrest 60 from below is provided, contact with the unevenness of the road surface In addition to protecting the engine unit 30 and the like from the earth and sand that the front wheel 17 jumps up, it is possible to improve the ride-over property when traveling on a rough road. Moreover, the ease of crossing when getting on and off is ensured by the underbone structure.

  Further, since the rear portion 40b of the under guard 40 is attached to the engine case 33 with the mounting bosses 43L and 43R recessed upward as fastening portions, the fastening elements such as the bolts 51 do not protrude downward from the under guard 40, The fastening portion can be protected from contact with the ground. Moreover, since the mounting bosses 43L and 43R are provided in the vicinity of the bar-shaped arm 61 of the footrest 60, the fastening portion is also protected by the strength of the bar-shaped arm 61. Furthermore, since the under guard 40 is attached to the engine unit 30 in a floating state, the engine unit 30 can be protected from vibrations and shocks to the under guard 40.

  Further, according to the present embodiment, the mud guard 23 provided at the lower front portion of the air cleaner box 21 covers the cylinder head 31 from the front in cooperation with the under guard 40, so that the rear portion 16a of the front fender 16 is shortened. In addition, the front portion of the cylinder head 31 can be effectively protected from earth and sand. As a result, a large volume of the air cleaner box 21 can be secured. Further, not only can the front fender 16 be reduced in size and weight, but also the clearance between the rear portion 16a of the front fender 16 and the air cleaner box 21 can be reduced, so that the stroke of the front fork 14 can be set longer.

  Further, since the position of the rear end edge 16aa of the rear portion 16a of the front fender 16 is lower than the front upper end position 21a of the air cleaner box 21, entry of muddy water or the like flowing along the inner surface of the front fender 16 into the air cleaner box 21 is prevented. can do.

1 is a right side view of a motorcycle according to an embodiment of the present invention. Fig. 3 is a right side view of a main part of the motorcycle according to the present embodiment. It is a disassembled perspective view of an under guard and a footrest. It is a bottom view of an underguard.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Down tube 11a Front end part 13 Head pipe 14 Front fork 15 Handle bar 16 Front fender 16a Rear part 16aa Rear end edge 17 Front wheel 19 Driver seat 20 Car body cover 21 Air cleaner box 21a Upper end position (front upper end position 21a)
23 Mudguard 30 Engine unit 31 Cylinder head 32 Cylinder 33 Engine case 35 Exhaust pipe 36 Air exhaust port 40 Engine under guard 40a Front part 40aa Front upper edge 40b Rear part 43L, 43R Mounting boss (concave mounting part)
60 Footrest 62 Mounting plate (Mounting part)
S1 Foot space S2 Cooling air passage

Claims (5)

A front fork having a handlebar attached to the upper end and a front wheel rotatably supported at the lower end, a head pipe rotatably supporting the front fork, and extending obliquely downward from the head pipe toward the rear. A down tube that is curved so as to be substantially horizontal, a driver seat provided substantially in the center of the vehicle longitudinal direction, a foot space formed between the driver seat and the head pipe, and an engine case, has a cylinder and a cylinder head, at the lower of the foot through space, and an engine unit in which the cylinder head is disposed substantially horizontally in the front-rear direction so as to be positioned on the front side, has a cleaner box of the front wheel An air intake device disposed rearward and between the cylinder of the engine unit and the front end of the down tube , Which is connected to the lower portion of the cylinder head of the engine unit, the installation and the exhaust pipe extending rearward through below the cylinder head and the cylinder, the bottom wall of the engine case of the engine unit has a mounting portion In a motorcycle provided with a footrest attached with a part and extending in the left-right direction,
A vehicle body cover provided to cover at least the intake device from above and from the side;
Attached to the front fork to cover the front wheel from above, the rear part overlaps the air cleaner box in the vertical direction, and the rear edge of the rear part is formed at a position lower than the upper end position of the air cleaner box and higher than the lower end position. Front fenders,
An engine under guard that covers at least the cylinder head of the engine unit from the front and the bottom;
A motorcycle having a mud guard extending downward from a lower front portion of the air cleaner box to cover the cylinder head of the engine unit from the front and extending to the vicinity of a front upper edge of the engine under guard. . The engine underguard further said cylinder, said engine case, the exhaust pipes of the front and claim 1 motorcycle, wherein the TURMERIC covering the attachment portion of the footrest from below. In the rear part of the engine under guard, a concave attachment part is provided that is recessed upward in the vicinity of the footrest, and the front part of the engine under guard is attached to a side part of the cylinder or a side part of the cylinder head, The motorcycle according to claim 2 , wherein a rear portion of the engine under guard is attached to the engine case by the concave attachment portion. The motorcycle according to claim 2 or 3 , wherein the engine under guard is attached to the engine unit in a floating state. The engine unit is an air-cooled engine in which cooling fins are provided on an outer surface of the cylinder head and an outer surface of the cylinder, and a gap is provided between the cylinder head and the cylinder and the engine under guard. the cooling air passage is formed, in the rear vicinity of the cylinder, any one of claims 2-4, characterized in that the exhaust air port for discharging the cooling air through said cooling air passage is provided Motorcycle described in 1.

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