JP2519630Y2 - Air introduction device for cooling motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention is directed to a motorcycle equipped with a cowling, which is used to cool a carburetor, etc. Regarding

(Prior Art) Conventionally, in a motorcycle equipped with a cowling, since the carburetor and the like are surrounded by the cowling, the temperature of the carburetor and the like may rise. Therefore, there is one in which an air duct is provided in the cowling to positively guide cooling air to a carburetor or the like to forcibly cool the carburetor or the like.

(Problems to be solved by the invention) However, since the air intake port of the air duct is normally opened at a position where it is difficult to absorb raindrops when traveling in the rain,
The air intake efficiency of the air duct may decrease, and the cooling efficiency of the carburetor and the like may decrease.

On the contrary, if the air intake port is provided at a position where air can be sufficiently taken in, a large amount of raindrops may be sucked by the air duct when traveling in the rain, and a large amount of raindrops may be introduced into the vaporizer or the like.

The present invention has been made in consideration of the above circumstances, and provides a cooling air introduction device for a motorcycle capable of supplying sufficient cooling air without causing raindrops to flow into a carburetor or the like even when traveling in the rain. The purpose is to

[Constitution of device]

(Means for Solving the Problems) In order to achieve the above object, a cooling air introducing device for a motorcycle according to the present invention is provided with an air duct inside a cowling that covers a front portion of a motorcycle body. In a cooling air introduction device for a motorcycle having a rear end opened near the carburetor of an engine, an air suction port of the air duct is opened at the top of a portion where the cowling is convex toward the front, and in the middle of the air duct. Is provided with a pipe expanding portion whose inner diameter gradually expands toward the downstream side and gradually decreases again.
A porous member capable of passing air is provided in the maximum inner diameter portion of the pipe expanding section to partition the passage of the air duct, a drain port located immediately upstream of the porous member is provided on the bottom surface of the pipe expanding section, and the side surface of the air duct is further provided. It is characterized in that the shape is such that it has a downward sloping portion from the air suction port toward the expanded portion, and has an ascending slope portion immediately downstream of the porous member and rising toward the downstream side.

(Operation) Therefore, according to the motorcycle cooling air introduction device of the present invention, the air intake port of the air duct is opened at the top of the portion where the cowling is convex toward the front. Since the air suction efficiency is good, a sufficient amount of cooling air for sufficiently cooling the carburetor and the like can be supplied to the carburetor and the like through the air duct.

When traveling in the rain, raindrops are sucked from the air intake port of the air duct together with the cooling air, but the raindrops sucked into the air duct have their flow velocity reduced in the pipe expanding portion of the air duct. It collides with the porous member at a slow speed and flows downward along the porous member. The raindrops flowing down are discharged to the outside of the air duct from the drain port located immediately upstream of the porous member.

In this way, the raindrops can be separated from the cooling air at the expanded portion of the air duct, so that the raindrops do not enter the carburetor or the like even when traveling in the rain. In addition, raindrops that flow on the surface of the cowling when traveling in the rain flow radially from the top of the part where the cowling is convex toward the front in response to the traveling wind, so the air intake port of the air duct that opens to this top is the cowling. Raindrops that flow on the surface of the are difficult to enter, so that it is possible to more effectively prevent raindrops from entering the vaporizer and the like.

Further, since the side shape of the air duct is lowered downward from the air suction port toward the pipe expanding portion, raindrops attached to the inner wall of the air duct easily flow into the drain port. Further, even if raindrops pass through the porous member, the raindrop does not flow to the downstream side because the upslope portion is provided immediately downstream of the porous member, and the raindrops are returned to the upstream side of the porous member. Is discharged from the drainage port.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are a plan view and a side sectional view, respectively, of an air duct showing an embodiment of a cooling air introducing device for a motorcycle according to the present invention, and FIGS.
The drawings are a plan view and a side view, respectively, showing a motorcycle to which the air ducts of FIGS. 1 and 2 are applied.

As shown in FIGS. 3 and 4, an engine 1 is mounted in the center of the vehicle body of the motorcycle, and a carburetor 2 and an air cleaner (not shown) are arranged in the engine 1 to supply a new air-fuel mixture to the engine 1. Supply. A fuel tank 3 and a seat 4 are arranged above the engine 1. Front wheel 5
Is supported by a vehicle body frame 7 with a part omitted, via a front fork 6. Further, the rear wheel 8 is supported by the vehicle body frame 7 via the swing arm 9.

A cowling 10 is attached to the body of such a motorcycle to reduce air resistance, protect the rider from wind pressure, and increase the maximum speed. This cowling
An air duct 11 extending from the front of the vehicle body to the vicinity of the carburetor 2 is arranged at 10. As shown in FIGS. 1 and 2, the air duct 11 includes an air inlet 12 opened in the front surface of the cowling 10, a conduit first element 13 and a conduit second element 14, and a porous member 15. Is configured.

The air intake port 12 is provided so as to open at the top of a portion where the cowling 10 is convex toward the front in side view, for example, at the foremost end of the cowling 10 as shown in FIG.
This place is a position with good air intake efficiency that can secure a sufficient amount of air when the motorcycle is running. The air inlet 12 and the upstream end of the first conduit element 13 are connected by the holder 16.

The first duct line element 13 is gradually expanded in diameter on the downstream side to form a first bulge portion 17. Further, in the second conduit element 14, the upstream side thereof is expanded to the same extent as the first bulging portion 17, and the second bulging portion 18 is formed by gradually reducing the diameter toward the downstream side. The conduit first element 13 and the conduit second element 14 are detachably joined by welding, bolts, nuts or the like. Then, the first bulge portion 17 and the second bulge portion
A pipe expanding portion 19 is formed by 18 in the middle of the air duct 11. Therefore, the expanded portion 19 has a shape in which the inner diameter is gradually reduced toward the downstream side and is gradually reduced again.

The joint between the first conduit line element 13 and the second conduit line element 14 is the maximum inner diameter portion of the expanded pipe portion 19, and the porous member 15 is interposed therein. The porous member 15 is configured to allow air to pass therethrough by using a lattice or a drain-shaped structure.

Further, a drainage port 22 is provided on the bottom surface of the pipe expanding section 19. The drainage port 22 is provided on the side of the conduit first element 13 so as to be located immediately upstream of the porous member 15, and a drain hose 23 is connected to the outside.

As shown in FIG. 2, the overall side shape of the air duct 11 is configured to descend downward from the air suction port 12 toward the pipe expanding portion 19, and the air discharge port provided at the downstream end of the air duct 11. 24 is opened in the vicinity of the vaporizer 2. Further, the upstream side of the conduit first element 13 and the downstream side of the conduit second element 14 are formed in a substantially linear shape having substantially the same diameter and being thinner than the expanding portion 19. Further, immediately upstream of the porous member 15, there is provided an ascending slope portion 25 that rises toward the downstream side. The conduit first element 13 and the conduit second element 14 are blow-molded with, for example, a synthetic resin.

The expanded portion 19 of the air duct 11 reduces the flow velocity of the cooling air 20 sucked from the air suction port 12. Further, the porous member 15 collides the raindrops 21 mixed in the cooling air 20 to adhere them, and causes the raindrops 21 to flow downward along the porous members 15. Further, the drain port 22 guides the rain 21 flowing down along the porous member 15 to the drain hose 23 and discharges it to the outside. The drain hose 23 is similar to the drain hose for gasoline, batteries, cleaners, etc.
Guide 21 to a position where it does not touch the rear wheels.

Next, the operation of the cooling air introducing device configured as described above will be described.

When the motorcycle is traveling, the traveling wind blowing from the front is blown into the air intake port 12 of the air duct 11. The traveling wind flows as cooling air 20 in the air duct 11, and the porous member 15
And is supplied to the carburetor 2 and the like from the air outlet 24. The air intake port 12 is opened at the top of the portion where the cowling 10 is convex toward the front, and this portion has a good air intake efficiency, so that the amount of cooling air 20 sufficient to cool the carburetor 2 and the like is sufficient. Can be supplied to the carburetor 2 and the like through the air duct 11.

Also, when the motorcycle runs in the rain, the air intake port
Raindrops 21 are inhaled together with the cooling air 20 from 12 and these raindrops 21
Cooling air 20 including 21 flows along the duct of the air duct 11. When the cooling air 20 reaches the pipe expanding portion 19, the air duct 11
Since the passage area is expanded, the flow velocity of the cooling air 20 decreases, and the raindrops 21 collide with the porous member 15 at a slow speed.

Raindrops 21 that have collided and adhered to the porous member 15 are cooled air.
Since the flow velocity of 20 is low, it flows downward along the porous member 15 as it is, accumulates in the expanded pipe portion 19 and enters the drain port 22, and is discharged to the outside of the air duct 11 via the drain hose 23. On the other hand, the cooling air 20 reaching the expanded portion 19 passes through the porous member 15 with a relatively small resistance because it has a low flow velocity, reaches the second conduit element 14, and then the air outlet 24 to the carburetor 2 and the like. Be guided.

In this way, raindrops 21 are formed in the expanded portion 19 of the air duct 11.
Since it can be separated from the cooling air 20, raindrops do not enter the carburetor 2 and the like even when traveling in the rain. Moreover, the raindrops flowing on the surface of the cowling 10 when traveling in the rain flow radially from the top of the portion where the cowling 10 is convex toward the front in response to the traveling wind, so the air intake port of the air duct 11 opening at this top. Raindrops that flow on the surface of the cowling 10 are unlikely to enter the 12 so that the raindrops can be prevented from entering the carburetor 2 and the like more effectively.

Furthermore, since the side shape of the air duct 11 is lowered downward from the air suction port 12 toward the pipe expanding portion 19, the air duct 11
Raindrops 21 adhering to the inner wall of 11 are easily collected in the drain port 22. Further, even if raindrops 21 pass through the porous member 15, the raindrops 21 do not flow to the downstream side of the uphill slope portion 25 because the uphill slope portion 25 is provided immediately downstream of the porous member 15. The raindrops 21 are returned to the upstream side of the porous member 15 and discharged from the drain port 22.

In addition, since the expanded portion 19 of the air duct 11 is not limited in its arrangement position, it is possible to increase the degree of freedom in installing the air duct 11 on the cowling 10.

[Effect of device]

As described above, in the motorcycle cooling air introduction device according to the present invention, the air suction port of the air duct is opened at the top of the portion where the cowling is convex toward the front, and in the middle of the air duct, the downstream side is provided. The inner diameter is gradually increased toward the inner diameter, and the diameter of the inner diameter is gradually reduced again.Then, the maximum inner diameter of the expanded portion is provided with a porous member capable of passing air to partition the passage of the air duct. A drain outlet located immediately upstream of the porous member is provided, and the side shape of the air duct further decreases downward from the air inlet toward the pipe expanding portion, and immediately upstream of the porous member toward downstream. It is characterized in that it is configured to have an upslope portion.

In this way, if the air inlet of the air duct is opened at the top of the portion where the cowling is convex toward the front, the air intake efficiency will be good and the amount of cooling air will be sufficient to cool the carburetor etc. Can be flowed to the air duct.

Further, when traveling in the rain, raindrops are sucked together with the cooling air from the air intake port of the air duct. The sucked raindrops slow down the cooling air in the pipe expansion part provided in the middle of the air duct, and permeate the pipe expansion part. Since it is separated from the cooling air by the shielding effect of the member, it is possible to prevent raindrops from entering the vaporizer or the like.

Moreover, the raindrops that flow on the surface of the cowling when traveling in the rain flow radially from the top of the part where the cowling is convex toward the front in response to the traveling wind, so the air intake port of the air duct that opens to this top is the cowling. It is difficult for raindrops to flow onto the surface of the, and it is possible to more effectively prevent raindrops from entering the vaporizer or the like.

Furthermore, since the side shape of the air duct descends downward from the air suction port toward the expansion part, raindrops adhering to the inner wall of the air duct are likely to collect at the drain port, and the upslope provided immediately downstream of the porous member. Since the portion functions to return the raindrops that have passed through the porous member to the drain port, the waterproof property can be significantly improved, and a sufficient amount of cooling air can be supplied while ensuring the waterproof property.

[Brief description of drawings]

1 and 2 are a plan view and a side sectional view, respectively, of an air duct showing an embodiment of a cooling air introduction device for a motorcycle according to the present invention, and FIGS. FIG. 3 is a plan view and a side view showing a motorcycle to which the air ducts of FIGS. 2 and 3 are applied, respectively. 1 ... Engine, 2 ... Vaporizer, 10 ... Cowling, 11
…… Aeduct, 12 …… Air inlet, 15 …… Perforated member,
19 …… Expansion section, 20 …… Cooling air, 21 …… Raindrop, 22 ……
Drainage outlet, 24 …… Air outlet, 25 …… Upward slope.

Claims (1)

(57) [Scope of utility model registration request] 1. A cowling 10 for covering a front portion of a motorcycle body.
In an air introducing device for cooling a motorcycle in which an air duct 11 is disposed inside, and a rear end of the air duct 11 is opened near the carburetor 2 of the engine 1, the air suction port 12 of the air duct 11 is connected to the cowling. An expanding portion in which 10 is opened at the top of the convex portion toward the front, and in the middle of the air duct 11, the inner diameter gradually increases toward the downstream side and gradually decreases again.
19 is provided, and the maximum inner diameter of the expanded portion 19 is provided with a porous member 15 capable of passing air to partition the passage of the air duct 11.
A drainage port 22 located immediately upstream of the porous member 15 is provided on the bottom surface of the expanded pipe portion 19, and the side shape of the air duct 11 is further lowered downward from the air suction port 12 toward the expanded pipe portion 19 to form the porous structure. A cooling air introduction device for a motorcycle, characterized in that it has an ascending sloped portion (25) immediately downstream of the member (15) and goes up to the downstream side.