JPH02279481A - Running air guiding device for motorcycle - Google Patents

Abstract

PURPOSE:To perform the intake of running air into an engine smoothly and efficiently by installing a duct which guides the running air to be taken out of an air intake formed in a cowling toward a clearance between an air cleaner and a cover body. CONSTITUTION:Running air 42 caused at time of running of a motorcycle 1 is led into the inner part of a cowling 36 from an air intake 44. At this time, the running air 42 is guided into a clearance 31 between an air cleaner 15 and a lower plate 29 from a guide duct 45. Another running air 52 flowing in this clearance 31 is inhaled into the air cleaner 15 from an intake port 20 being opened to the clearance 31. In brief, each running air (42, 52) is passed through the guide duct 45 and the clearance 31, and thereby smoothly inhaled into the air cleaner 15 without being hindered by other constituent parts. In addition, the running air 51 is passed through the vicinity of a carburetor 13, thereby cooling this carburetor. Moreover, the running air 51 is passed through the rear of an exhaust port 40 in running air 41 heated through a radiator 35, thus interference with both of them is avoided in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a running wind guide device for a motorcycle that effectively guides running wind to an air cleaner.

(Prior Art) A motorcycle usually has as its component parts an engine, a carburetor that causes the engine to take in a mixture, and an air cleaner that filters and sends air to the carburetor.

Additionally, in addition to the above configuration, there are engines that are equipped with a radiator for cooling the cylinders of the engine, and are provided with cowlings that cover the left and right sides of the engine and the radiator (for example, Japanese Utility Model Application No. 61-59183). .

(Problems to be Solved by the Invention) Incidentally, since the body space of a motorcycle is extremely narrow, the above-mentioned components are disposed close to each other in the space.

For this reason, there is a risk that the flow of air flowing toward the air cleaner intake hole may be obstructed by other components.
When the flow of the traveling air is obstructed in this way, there arises a disadvantage that the engine performance deteriorates. Further, when the running wind passes through the radiator, it turns into hot water, which may be sucked into the engine through the air cleaner, causing a problem of deterioration of engine performance.

(Object of the Invention) The present invention has been made in view of the above-mentioned circumstances, and is designed to smoothly guide the wind from a vehicle to the air cleaner, and to direct the wind guided to the air cleaner to the radiator. The purpose is to improve engine performance by preventing vibrations caused by heat.

(Structure of the Invention) A feature of the present invention for achieving the above object is that an air inlet for introducing running air into the inside of the cowling is formed in the cowling, and the running air introduced by the air inlet is formed in the cowling. A guide duct is provided to guide the air cleaner toward the gap between the air cleaner and the cover body, and the intake hole of the air cleaner is opened toward the gap, so that the traveling wind guided by the guide duct passes near the carburetor. , and passes through the rear side of the air outlet formed in the cowling.

(for production) The effects of the above configuration are as follows.

Traveling wind 42 when the motorcycle l is traveling is introduced into the cowling 36 through the air introduction port 44. Then, this running wind 42 is guided by a guide duct 45 to a gap 31 between the air cleaner 15 and the lower plate (cover body) 29, and flows through this gap 31. By the way, the air intake hole 20 of the air cleaner 15 is open in this gap 31.

-F The traveling wind 52 flowing through the gap 31 is sucked into the intake hole 20.

In other words, the traveling wind 42.52 flows between the guide duct 45 and the gap 31.
The air is smoothly sucked into the air cleaner 15 without being obstructed by other components.

Moreover, the travel guided by the guide duct 45/! 1
51 passes near the carburetor 13, the vaporizer i(:i13) is cooled by this running wind 51.Moreover, the running wind 51 is heated by the running wind 41 that has passed through the radiator 35. Since it passes through the rear side of the exhaust port 40, the running wind 41 after passing through the radiator 35 is prevented from being mixed into the running wind 51.
1 is prevented from being heated.

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

In FIGS. 1 to 3, ■ is a motorcycle 11, the body frame 2 of this motorcycle 1 has a head vibrator 3 at the front part, and a front fork 4 is attached to the head vibrator 3.
is supported so that it can be steered freely. A front wheel 6 is supported at the lower end of this front foot 4, while a handle 7 is attached to the upper end. Further, the small body frame 2 has a pair of left and right main frames 8.8 extending rearward and downward from the head vibrator 3, and each of the main frames 8.
has a box-shaped cross section with a long vertical width.

Below the main frame 8.8 is a four-stroke engine 9.
The engine 9 is firmly supported by bolts 10 on brackets 8a projecting from each of the main frames 8. The cylinder 11 of the engine 9 protrudes forward from the crankcase I2, that is, the cylinder 11 is tilted forward.

A plurality of carburetors 13 are arranged in parallel in the left-right direction above the cylinders 11 between the left and right main frames 8.8, and these are connected to the intake boats of the cylinders 11. Further, an air cleaner 15 is provided above the carburetor 13.

This air cleaner 15 has a cleaner case 16 made of resin.
This cleaner case 16 has the main frame 8.
It is supported by 8. An element 17 is detachably provided at the front inside the cleaner case 16.

The cleaner case 1G on the downstream side of this element 17 is connected to the carburetor 13 by a connecting vibe 18 made of rubber, while the cleaner case 16 on the upstream side of the above-mentioned Niremens 1 to 17 has an intake pipe 19 projecting therefrom. The inside of this intake pipe 19 serves as an intake hole 20 through which outside air is taken in.

A fuel tank 23 for supplying fuel to the carburetor 13 is provided. This fuel tank 23 is firmly supported on the main frame 8.8 by brackets 25 and bolts 26 via a buffer material 24. Further, the fuel tank 23 is formed by joining an upper plate 28 and a lower plate 29 facing each other in the middle, and fuel 30 is stored therein.

The F plate 29 is bent so that its lower surface becomes a smooth concave surface. This lower plate 29 covers the air cleaner I5 with a gap 31 in between.
This lower plate 29 constitutes a cover body over which the air cleaner 15 is covered. To explain this more specifically,
9 is a ceiling t2 whose front part covers the upper surface of the air cleaner 15;
ii 29a, and the rear part is bent downward to form a vertical wall 29b, which further covers the rear surface of the air cleaner 5. The left and right sides of the upper and lower plates 29 are also bent downward to form side walls 29c, 29c, and each side wall 29C covers the corresponding side surface of the air cleaner 15.

Additionally, a seat 33 is provided on the vehicle body frame 2 behind the fuel tank 23.

A radiator 35 for cooling the cylinder 11 is provided in front of the cylinder II.

36 in the figure is a resin cowling, and this cowling 36 includes an upper cowl 37 that covers the vehicle body frame 2 and the FF1I4 tank 23 from the front, and a lower cowl 38 that covers the engine 9 and the radiator 35 from the left and right sides. The lower edge of the upper cowl 37 and the top edge of the lower cowl 38 are screwed together.

An air outlet 40 is formed in the lower cowl 38. This air discharge [140] is for discharging the running air 41 that has passed through the radiator 35 and become a single product air to the outside of the lower cowl 38. , l are arranged on the side of the front surface. When the traveling wind 41 passes through the radiator 35, the cylinder 1
1, the air outlet 40 is guided laterally by the forward direction of the air outlet 40.
is discharged through the

In FIGS. 1 to 5, air introduction [
] 44 are formed on each of the lower cowls 38.

In addition, the running wind 42 introduced through this air introduction port 44
A guide duct 45 made of resin is provided to guide the nits toward the gap 31.

The guide duct 45 is composed of a duct main body 46 having a U-shaped cross section, and a pair of 112F ribs 47.47 integrally molded on the inner surface of the lower cowl 38.
The rear ends of the two are connected to each other. Further, the duct body 46 is screwed onto the inner surface of the lower cowl 38 by bolts 48 with the valley opening edge of the duct body 46 joined to the protruding edge of the rib 47.47. One end of this guide duct 45 opens into the air inlet 44.
The other end extends rearward, and the duct body 4 at the rear end
6 is formed with a nozzle 49 that opens toward the gap 31.

In the above case, the air tJF outlet ( ) 40 faces the outside of the lower cowl 38 and opens rearward, so that the running wind that flows vigorously along the outer surface of the lower cowl 38 can cause the lower cowl 38 to The air inside the air cleaner 15 is effectively sucked out to the outside through the air exhaust port 40.The nozzle 49 is particularly designed to fill the gap between the rear surface of the air cleaner 15 and the front surface of the vertical wall 29b. 31
It is formed to face.

At the rear of the space connecting each nozzle 49 and the gap 31, auxiliary equipment (not shown) for the engine 9, such as a fuel pump, is installed.

For this reason, from the nozzle 49 or! The emitted running wind 51 is guided toward the gap 31 by the front surface of the auxiliary machinery. Then, the traveling wind 5 that passed through this gap 31
2 flows forward through the gap 31 between the upper surface of the air cleaner 15 and the ceiling plate 29a, and from here, this traveling wind 52 flows into the space closed by the cylinder Il, the air cleaner 15, and the radiator 35. and is discharged to the outside of the lower cowl 38 from the air outlet 40. In this case, the traveling wind 52 is caused by the traveling wind passing outside the lower cowl 38 as described above.
fJJ is effectively sucked out to the outside of 8, that is, it is smoothly discharged.

By the way, the upper surface of the air cleaner 15 and the ceiling plate 2 mentioned above
Air cleaner 1 is installed toward the rear in the gap 31 between
The intake hole 20 of No. 5 is open, so that a part of the traveling wind 52 flowing forward through the gap 31 is smoothly sucked into the intake hole 20.

Further, the traveling wind 51 ejected from the nozzle 49 is ejected along the rear surface of the carburetor 13 on the float chamber side.
is to be effectively cooled by the traveling wind 51. Further, the guide duct 45 is located below the radiator 35 and the air outlet 40, and historically, the traveling wind 51 blown out from the nozzle 49 of the guide duct 45 passes through the rear side of the air outlet 40. ing. For this reason,
It is also prevented that the heated running wind 41 that has passed through the radiator 35 is mixed into the running wind 51 and that the running wind 41 is heated. Therefore, the running wind 52 is sucked into the air intake hole 20 of the air cleaner 15 while being a cold wind.

Note that the guide duct 45 extends largely in the front-rear direction of the lower cowl 38. Therefore, each guide duct 45
The lower cowl 38 is sufficiently reinforced to improve its rigidity. On the other hand, each guide duct 45 shown in L crosses the base side surface of the cylinder 11 at a substantially right angle to the cylinder II. That is, the left side surface of the base of the cylinder 11 is a recess 11a that is recessed compared to the generator cover 12a protruding from the crankcase 12, and this recess 11. By locating the left guide duct 45 at point a, consideration is given to preventing the width of the vehicle body from increasing. Similarly, the right side of the base of the cylinder 11 has a recess 11b that is recessed compared to the clutch cover 12b protruding from the crankcase 12, and the right guide duct 45 is located in this recess 11b. There is. On the other hand, the gap 3
Since the traveling wind 52 guided by the fuel tank 1 flows along the lower plate 29, this traveling wind 52 also cools the fuel tank 23.

1, 2, 8 and 5, a thermostat 53 is attached to the outside (j, 11) of the right main frame 8 of the main frame 8.8, and the thermostat 53 is connected to the radiator 35. One end of a water vibrator 54 into which cooling water flows is connected, and the other end of this water vibrator 54 extends along the left guide duct 45.
A return vibe 55 is provided for returning water from the F thermosket 53 to the radiator 35, and a portion of this return vibe 55 extends along the right guide duct 45.

In FIGS. 1, 3, and 6, brackets 58 are screwed to the helad vibrator 3 and each main frame 8 with bolts 57, respectively. This bracket 58 is formed by a circular vibrator frame, and a pair of left and right projector clamps 59 are attached to the front part of the bracket 58.
A meter 60 such as a speedometer is screwed to the bracket 58 above the left and right projector lamps 59 and 59.

By the way, in the conventional configuration where the air cleaner 15 is provided above the main frames 8, 8 as described above,
A guide duct is provided to guide the traveling wind from an air inlet formed in the upper cowl 37 to the air cleaner 15, and therefore a space sufficient to accommodate this guide duct is provided behind the upper cowl 37.

However, according to the above-mentioned embodiment, the guide duct 45 is provided below the upper cowl 37, and therefore, it is not necessary to provide a space behind the upper cowl 37 to accommodate the guide duct 45. . Moreover, the projector lamp 59 is long from front to back due to its structure, but compact from top to bottom. For this reason, the overall height of the handle 7, projector lamp 59, and meter 60 at the rear of the upper cowl 37 is sufficiently reduced, and the rearward inclination of the windshield 62 at the upper cowl 37 is reduced accordingly. It's bigger. That is, this improves the aerodynamic characteristics of the vehicle body.

(Effects of the Invention) According to the present invention, an air inlet for introducing running wind into the inside of the cowling is formed in the cowling, and the running wind introduced by the air inlet is passed through the gap between the air cleaner and the cover body. A guide duct is provided to guide the air cleaner toward the gap, and the air intake hole of the air cleaner is opened toward the gap, so that when the motorcycle is running, the air flowing through the air cleaner and the cover body is directed through the air intake port and the guide duct. At this time, this running wind is sucked into the air cleaner's intake hole.

That is, the running wind introduced into the cowling through the air inlet passes through the guide duct and the gap, thereby
Engine performance is improved because the air is smoothly drawn into the air cleaner without being obstructed by other components.

Further, since the traveling wind guided by the guide duct passes near the carburetor, the carburetor is cooled by this traveling wind. Moreover, since the running wind passes through the radiator and passes behind the heated running air outlet, the running wind after passing through the radiator is prevented from being mixed with the running wind. This prevents the running air from being heated.

Therefore, the temperature of the intake air of the engine is lowered, and the engine performance is improved, such as the charging efficiency is improved accordingly.

Margin below C)

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a partial front side view of a motorcycle, Fig. 2 is a partial plan view, Fig. 3 is a partial front view, and Fig. 4 is a right side lower cowl and guide. A perspective development view 8 of the duct, FIG. 5 is a sectional view taken along the line V-V in FIG. 1, and FIG. 6 is a partial view taken along the line Vl − and Vl in FIG. , 9...Engine, II cylinder, 1
3. Carburizer, 15. Air cleaner, 20. Intake hole, 29. Lower plate (cover body), 31. Gap, 35. Radiator, 36. Cowling, 40. Air outlet, 4
1. Running wind, 42. Running wind, 44. Air inlet, 4
5. Guide duct, 51. Traveling wind, 52. Traveling wind. Figure 2 Figure ÷ 1-44 No. 42

Claims (1)

[Claims] 1. A carburetor is connected to the cylinder of the engine, and an air cleaner connected to this carburetor is provided above the same carburetor, and the top surface, left and right side surfaces, and rear surface of this air cleaner are covered with a cover body with gaps between them. On the other hand, a radiator is provided in front of the engine, the right and left sides of the engine and the radiator are covered with a cowling, and an air outlet is formed in the cowling for discharging the running wind after passing through the radiator to the outside of the cowling. In a motorcycle, an air introduction port for introducing running air into the inside of the cowling is formed in the cowling, and a guide for guiding the running air introduced by the air introduction port toward a gap between an air cleaner and a cover body. A duct is provided, the intake hole of the air cleaner is opened toward the gap, and the traveling wind guided by the guide duct passes near the carburetor,
Further, a running wind guide device for a motorcycle, which passes through the rear side of the air exhaust port.