JPH05286473A - Air introducing device of motorcycle - Google Patents

Abstract

PURPOSE:To introduce a great amount of low temperature travelling air into an engine section by forming integrally an air introducing path surrounding the periphery of a head pipe and the side of a front fork from the front part of a main frame, forming an air introducing port in the front end of the air introducing part and forming a blast port for blowing off travelling air to the proximity of the engine behind the head pipe in the air introducing part. CONSTITUTION:A car body frame 2 is formed on the front part integrally with a box-like air introducing part 44 for introducing travelling air into a throttle body. The air introducing part 44 is composed of a connection 43a of left and right main frames 43, 43 surrounding part 44a about the periphery of a head pipe 3 and fork bodies 4a, 4a and further an extension part 44c extending forward. Thus, the travelling air is prevented from being mixed with high temperature air passing through a radiator 64. A pair of elliptic inserting holes 44b in the surrounding part 44a are sized not to interfere with the pivoting of a front fork, and the extension part 44c is provided on the tip with an atmosphere introducing port 44d. An air introducing duct is connected to a blast port 43c, so that a sufficient path area can be ensured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind guide device for a motorcycle which introduces traveling wind near an engine. More specifically, when a front part of a vehicle body is surrounded by a cowling, a duct for wind guide, a pipe, etc. The present invention relates to an improvement in the shape of a vehicle body frame that allows a large amount of traveling wind to be introduced near the engine without adding any parts.

[0002]

2. Description of the Related Art In a motorcycle in which a front part of a vehicle body is surrounded by a cowling and a radiator is arranged in front of the engine, when the wind that has passed through the radiator is supplied to the engine, the temperature of the air is relatively high, so that the charging efficiency is high. There is a problem of decline. Therefore, it has been customary in the past to arrange a duct for guiding air, a pipe, etc. in the cowling, take in low-temperature traveling air in front of the radiator by means of this duct, and supply this to the engine. However, in the case of this method, separate parts such as a duct and a pipe are required, and the number of assembling steps increases accordingly. Therefore, as such an air guide device which does not use such a separate part, as described in, for example, Japanese Utility Model Laid-Open No. 2-123485, one in which a wind guide duct is integrally formed on the cowling, or the actual open air sho 62-43993. As described in the publication, there is one in which a tubular main frame constituting a vehicle body frame is used as a wind guide pipe.

[0003]

However, in the case of the above-mentioned conventional device, since the duct is integrally formed on the cowling or the existing main frame is used as a wind guide pipe, a sufficient passage area is secured. Therefore, there is a problem that it is difficult to secure a sufficient amount of introduction of traveling wind.

The present invention has been made in view of the above conventional circumstances, and provides a wind guide device for a motorcycle which does not require a separate component such as a wind guide duct and can introduce a large amount of traveling wind. The purpose is to

[0005]

According to a first aspect of the present invention, a motorcycle equipped with a body frame having a pair of left and right main frames extending rearward from a head pipe is provided near an engine mounted below the main frame. In the wind guide device for introducing traveling wind, in the front part of the body frame,
A box-shaped air guide portion is continuously formed around the head pipe and the left and right sides of the front fork from the front portion of the main frame, and a pair of left and right front fork portions are formed in the air guide portion. Forming a through hole through which the fork main body is inserted without hindering the steering operation, forming an air guide port for introducing traveling wind at the front end of the air guide part, and the head pipe rear part of the air guide part In addition, it is characterized in that a blower port is formed which opens toward the engine and blows traveling wind to the vicinity of the engine. The invention according to claim 2 is characterized in that the blower port and the intake passage opening portion of the engine arranged at the rear of the radiator are connected by an air guide duct.

[0006]

According to the air guide device of the present invention, the traveling wind is introduced into the air guide part from the air guide port and blown out from the air blow port to the vicinity of the engine, so that the low temperature traveling air is introduced into the engine. In addition, when the air outlet and the intake passage opening of the engine are connected by an air duct, the air that has passed through the radiator is not mixed with the air from the air outlet, so that low temperature air is more reliable for the engine. Is supplied to. Further, in the present invention, since the air guide section is formed so as to continuously surround the head pipe and the left and right sides of the front fork from the front portions of the pair of left and right main frames, and extends forward, a sufficient passage area is provided. Therefore, a large amount of traveling wind can be introduced. Further, since the air guide portion is formed in the shape surrounding the head pipe from the head pipe as described above, the rigidity of the vehicle body frame near the head pipe is significantly improved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are views for explaining an air guide device according to an embodiment of the present invention. FIG. 1 is a plan view, and FIGS.
Is a sectional view taken along the line II-II and a sectional view taken along the line III-III in FIG. 1, FIG. 4 is a front view near the intake port of the engine, and FIG. 5 is a left side view of a motorcycle equipped with the device of this embodiment.

In the figure, 1 is a motorcycle equipped with the device of this embodiment, 2 is a body frame of the motorcycle 1,
This is a structure in which the rear ends of a pair of left and right main frames 43, 43 extending rearward from the head pipe 3 are connected by a rear arm bracket 6. The steering pipe of the front fork 4 is pivotally supported to the left and right by the head pipe 3, and the front wheel 5 is pivotally supported at the lower end of the front fork 4. Further, a pivot part of a rear arm 7 formed by connecting a pair of left and right arm bodies 50 by the rear arm bracket 6 is pivotally supported up and down, and a rear wheel 8 is pivotally supported at a rear end of the arm 7. ing. An engine unit 9 is suspended and supported below the vehicle body frame 2, a fuel tank 10 is mounted above, and a seat 11 is disposed behind the fuel tank 10.
1 is surrounded by a side cover 12. Furthermore, the body frame 2, the engine unit 9 and the front fork 4 are surrounded by a cowling 13.

The engine unit 9 is a two-cycle water-cooled V-type four-cylinder engine, and has upper and lower front walls of the crankcase 14 and an upper cylinder body 15 and a lower cylinder body 16 each having a predetermined bank angle. The cylinder head 17 is attached to each cylinder body.

Upper and lower exhaust pipes 18 and 19 are connected to the rear surfaces of the cylinder bodies 15 and 16 in pairs of left and right. The left and right upper exhaust pipes 18, 18 are provided between the main frames 43, 43 from the side cover 12
The left and right lower exhaust pipes 19 and 19 extend obliquely upward along the left and right sides of the rear arm 7 through the inside of the crankcase 14.

A rear wheel drive sprocket 40 is fixed to the tip of the output shaft 37 protruding from the left wall of the rear end of the crankcase 14, and the sprocket 40 is a driven sprocket 41 fixed to the rear wheel 8. Drive chain 42
Are connected by.

Reed valves are inserted and arranged in upper and lower intake ports formed in the upper and lower cylinder bodies 15 and 16 of the crankcase 14, respectively. Throttle bodies 66 and 67 are connected via 67a. Below this,
Throttle valves 69a and 69b are rotatably disposed inside the upper throttle bodies 67 and 66,
Further, the fuel injection valve 68 is provided on the lower wall surface and the upper wall surface, respectively.
a and 68b are attached.

The lower throttle valve 69
a, 69a, and the upper throttle valve 69b,
69b are connected to each other by the minimum opening adjustment mechanism 70, 70. The minimum opening adjustment mechanism 70 has a structure in which arms 70a and 70b fixed to the left and right throttle valves are connected by an adjustment spring 70c and an adjustment bolt 70d. The lower adjusting mechanism 70 and the upper adjusting mechanism 70 are connected by an adjusting rod 80. The minimum opening of each throttle valve, and thus the idling speed, is adjusted by the adjusting bolt 70d and the adjusting rod 80. In addition, the throttle cable 72
Driving force from the lower left throttle valve 69a is transmitted to the lower right throttle valve 69b,
It is transmitted to the upper left and right throttle valves 69b, 69b.

Reference numeral 71 is the throttle valve 69a.
A throttle opening sensor for detecting the opening of the fuel injection valve, 73 and 74 are regulators for adjusting the fuel pressures supplied to the lower and upper fuel injection valves 68a and 68b, respectively, and 75 is a fuel for supplying the fuel to the fuel injection valves. It is a pump.

A box-shaped air guide portion 44 for introducing traveling wind into the throttle bodies 66, 67 is integrally formed on the front portion of the vehicle body frame 2. This air guide portion 44 is
A joint portion 43a formed by joining the front portions of the left and right main frames 43, 43, and the periphery of the head pipe 3,
And left and right fork main bodies 4a, 4 of the front fork 4
It is composed of a surrounding portion 44a surrounding the periphery of a and an extension portion 44c extending further forward from the surrounding portion 44a.

The joint portion 43a has a structure in which the bottom surfaces of the left and right main frames 43, 43 are connected by a bottom wall 43b and the inner surfaces are connected by an inclined wall 43e, and the communication port 43f surrounds the enclosure. It communicates with the portion 44a. Both left and right sides 43d of the bottom wall 43b are recessed upward, and a blower port 43c is formed at the rear end of the bottom wall 43b at the center in the vehicle width direction.

A pair of left and right oblong insertion holes 44b are vertically formed through the surrounding portion 44a, and the fork body 4a is inserted into the insertion hole 44b. The insertion hole 44b is set to a size that does not hinder the rotation of the front fork 4. Further, the extension portion 44c extending forward from the surrounding portion 44a is narrowed to the vehicle width center side, and an outside air introduction port 44d is formed at the tip of the extension portion 44c. This outside air inlet 44d is the cowling 1
The opening 13a formed at the front end of the No. 3 is exposed to the outside.

Further, the upper edges of the left and right main body portions 64a of the radiator 64 are located in the left and right side portions 43d which are recessed above the bottom wall 43b of the joint portion 43a. Are connected by a connecting hose 64a that crosses the bottom wall 43b left and right.

The introduction part 6 of the air duct 65 is installed in the air outlet 43c formed in the bottom wall 43b of the air duct 44.
5a is connected. The air guide duct 65 has a connecting portion 6 which is a box-like body having a substantially rectangular shape in a front view at a lower portion of the introducing portion 65a.
5b is integrally formed, and the connecting portion 65b is located on the center rear surface of the radiator 65. The throttle bodies 66 and 67 are inserted into the connecting portion 65b from the rear wall of the connecting body 65b and open inside the connecting portion 65b.

Next, the function and effect of this embodiment will be described. In the apparatus of this embodiment, the traveling wind introduced from the air guide port 44d of the air guide portion 44 into the extension portion 44c passes between the insertion hole 44b of the surrounding portion 44a and the head pipe 3 and the communication port 4 is formed.
It flows into the joint portion 43a from 3f, and is introduced into the throttle valves 66 and 67 from the blower port 43c of the joint portion 43a through the air duct 65. Therefore, the air having a lower temperature than the air heated through the radiator 64 is supplied to the engine, and the charging efficiency of the engine can be improved. Further, since the air duct 65 is connected, it is possible to reliably prevent the air having a relatively high temperature that has passed through the radiator 64 from being mixed in, and also from this point, it is possible to contribute to the improvement of the filling efficiency.

The air guide portion 44 of this embodiment has a shape that continuously surrounds the side of the front fork 4, the periphery of the head pipe 3, and the front portions of the main frames 43, 43. Since you can secure a sufficient passage area for traveling wind,
A large amount of traveling air can be introduced, and the required amount of air can be secured easily and reliably. Further, since the air guide portion 44 of this embodiment is set to the above-mentioned shape, it functions as a reinforcing member for improving the rigidity of the body frame 2 near the head pipe 3.

In the above embodiment, the blower port 43c and the throttle bodies 66 and 67 are connected by the air guide duct 65. However, even when this duct is not provided, the low-temperature running wind blown out from the blower port 43c. As a result, the air temperature near the throttle body can be lowered to some extent, and the effect of improving the charging efficiency can be expected.

FIGS. 6 to 9 are views for explaining the modified examples in which the structure of the front end portion of the air guide portion, the structure of the air guide passage around the head pipe, and the structure around the radiator are mainly improved in the above embodiment. In the drawings, the same reference numerals as those in FIGS. 1 to 5 indicate the same or corresponding portions.

In this modification, a steering handle 4d is fixed near the upper bracket between the lower and upper brackets 4b and 4c for connecting and fixing the left and right fork main bodies 4a of the front fork 4. The steering handle 4d is located within the height range of the head pipe 3 and is located above the surrounding portion 44a of the air guide portion 44 in a side view.

The extension portion 44c of the air guide portion 44 is formed separately from the surrounding portion 44a, and is detachably attached to the front end surface of the surrounding portion 44a by bolting. The outside air inlet 44d of the extension 44c is fitted and inserted into the opening 13a of the cowling 13. A meter unit 83 such as a speedometer and an engine tachometer is attached to the upper surface of the extension 44c via a bracket 83a. In this way, the extension portion 44c also functions as a front portion of the cowling 13 and a support stay for the meter unit 83.

A shimmy damper 82 for suppressing slight vibration of the steering handle 4d is disposed below the surrounding portion 44a in the vehicle width direction. A cylinder base end portion 82a of the shimmy damper 82 is bolted and fixed to a boss portion 4f of the lower bracket 4b, and a piston rod tip end portion 82b is formed on the boss portion 4a of the surrounding portion 44a.
It is bolted and fixed to 3g.

In this modification, the air guide recess 3a is provided in the side wall of the head pipe 3 between the bearings 4g, 4g, and the recess 3a and the side wall 43h of the main frame 43 connected thereto are provided. The space between them forms a part of the air guide passage (see FIG. 9).

On the air outlet side of the left and right radiators 64 arranged below the main frame 43, the upstream opening 8 of the exhaust duct 81 is formed so as to surround the rear surface of the radiators 64.
1b is connected. The downstream opening 81a of the exhaust duct 81 is connected to the exhaust port 13b formed on the cowling 13 on the side of the engine. As a result, the air that has passed through the radiator 64 is immediately discharged to the outside of the cowling 13.

In this modification, the bearing 4 of the head pipe 3 is used.
Since the conventional dead space portion between g and 4g is recessed in the vehicle width direction to form the air guide concave portion 3a, the air guide passage area can be expanded and the air guide amount can be increased.

Although the extension 44c of the air guide portion 44 is used as a cowling stay in the above modification, the supporting structure of the cowling 13 is not limited to this, and the supporting stay is provided near the head pipe of the vehicle body frame, for example. Attached, extend the support stay forward in the air guide section,
The cowling can also be supported at the extended end. Further, in the above-mentioned embodiment and modified example, the blower port is formed on the bottom surface of the air guide portion, but this blower port does not necessarily have to be formed on the bottom surface, and may be formed on another portion such as the inner side surface.

[0030]

As described above, according to the wind guide system for a motorcycle according to the present invention, a wind guide portion is integrally formed on the vehicle body frame, and the wind guide portion is provided on the front portions of the left and right main frames and the head. Since it has a shape that continuously extends around the pipe and the left and right sides of the front fork and extends forward, a sufficient passage area can be secured, and a large amount of low-temperature running wind can be introduced around the engine to fill the engine. There is an effect that the efficiency can be improved, and an effect that the rigidity in the vicinity of the head pipe of the vehicle body frame can be greatly improved by the air guide portion.

[Brief description of drawings]

FIG. 1 is a plan view showing a wind guide device for a motorcycle according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a front view around the throttle body of the above embodiment.

FIG. 5 is a left side view of a motorcycle including the device of the embodiment.

FIG. 6 is a plan view showing a modified example of the above embodiment.

FIG. 7 is a side view of the modified example.

FIG. 8 is a plan view of a radiator portion of the modified example.

9 is a sectional view taken along line IX-IX in FIG.

[Explanation of symbols]

 1 Motorcycle 2 Body Frame 3 Head Pipe 4 Front Fork 4a Fork Body 9 Engine Unit 43 Main Frame 43c Air Vent 44 Air Guide 44b Insertion Hole 44d Air Guide 64 Radiator 65 Air Guide 66, 67 Throttle Body )

Claims (2)

[Claims] 1. A wind guide device for introducing traveling wind near an engine mounted below a main frame of a motorcycle having a body frame having a pair of left and right main frames extending rearward from a head pipe. At the front part of the body frame, a box-shaped air guide part is integrally formed, which surrounds the head pipe and the left and right sides of the front fork continuously from the front part of the main frame, and further integrally forms the wind guide part. A pair of left and right fork main bodies of the front fork are formed through the insertion holes without disturbing the steering operation, and a wind guide port for introducing traveling wind is formed at the front end of the wind guide portion. A wind guide device for a motorcycle, characterized in that a blower opening is formed at a rear portion of a head pipe of the wind guide portion toward the engine to blow traveling wind near the engine. 2. The wind guide system for a motorcycle according to claim 1, wherein the blower port and an intake passage opening of the engine arranged behind the radiator are connected by a wind guide duct.