JPH05286472A - Wind introducing device of motorcycle - Google Patents

Abstract

PURPOSE:To introduce low temperature travelling air into an engine section to increase an amount of introduced air by making an air introducing attachment of a duct-like one surrounding the front end of a main frame and the left and right sides of a head pipe and front fork and having an air introducing port on the front end and forming an air introducing path for introducing the travelling air to the proximity of an engine. CONSTITUTION:A duct-like air introducing attachment 26 for introducing travelling air into an air introducing path 2a is removably attached to the front portion of a car body frame 2. The front parts 4a, 4a of left and right main frames 4, 4 surround a head pipe 3 and the sides of left and right fork bodies 7b, 7b of a front fork and extend further forward. The left and right duct parts 27, 27 extend through inserting holes 27a into which the fork body 7b is inserted without any obstucles against the steering operation. As a result, a great amount of the travelling air is introduced. A portion of the travelling air is supplied at a low temperature to an engine from an air introducing recess 3a of the head pipe 3 and a blast port 4d in a box-like part of the main frame 4 through an air introducing duct.

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 that introduces traveling wind near the engine when the front part of a vehicle body is surrounded by a cowling, and more specifically, it is possible to enlarge the air guide passage area. Regarding improvement of passage structure.

[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. For this reason, conventionally, there are many cases in which a wind guide device for introducing low-temperature running wind ahead of the radiator into the engine is provided.

As this type of air guide device, conventionally, as described in, for example, Japanese Utility Model Publication No. 4-3917, a body frame is used which is formed by extending a pair of left and right main frames from a head pipe to the rear of the vehicle. In some cases, the left and right main frames are extended forward of the head pipe, the extension portions are overlapped with each other in the vehicle width direction, and the overlapping portion serves as an air guide passage for introducing traveling wind.

[0004]

However, in the above-mentioned conventional device, since the left and right main frames are simply overlapped to form the air guide passage as it is, it is difficult to secure a sufficient air guide passage area. However, there is a problem that a sufficient amount of airflow cannot be obtained. It is considered that the passage area can be increased by increasing the diameter of the front extension of the main frame, but if the diameter is simply increased, there is a problem of interference with the front fork.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a wind guide device for a motorcycle capable of ensuring a sufficient air guide passage area.

[0006]

The invention according to claim 1 is mounted below a main frame of a motorcycle having a body frame formed by extending a pair of left and right main frames rearward from a head pipe. In the wind guide device for introducing traveling wind near the engine, a wind guide attachment is detachably attached to the front portion of the body frame, and the wind guide attachment is attached to the front portion of the main frame, the head pipe, and the front fork. The left and right sides are continuously surrounded and further extend toward the front of the vehicle to form a duct shape having an air guide port at the front end, and the pair of left and right fork main bodies of the front fork are hindered in steering operation in the air guide attachment. A guide hole for guiding the traveling wind introduced by the wind guide attachment to the front of the body frame to the vicinity of the engine. It is characterized by the formation of the.

According to a second aspect of the present invention, a pair of left and right duct connecting portions are integrally formed on the front portion of the main frame, and a wind guide attachment is detachably attached to the duct connecting portions. A duct connecting portion surrounds the left and right sides of the head pipe and the front fork, further extends toward the front of the vehicle, and has a duct shape having a wind guide port at the front end,
The air guide attachment and the duct connection part are formed with insertion holes through which the pair of left and right fork bodies of the front fork are inserted without hindering the steering operation, and the duct connection part and the front part of the vehicle body frame are provided with the above-mentioned guide holes. It is characterized in that a wind guide passage for guiding the traveling wind introduced by the wind attachment to the vicinity of the engine is formed.

[0008]

According to the air guide device of the present invention, traveling wind is blown from the air guide attachment through the air guide passage to the vicinity of the engine, and low temperature air is supplied to the engine. Here, when the engine side opening of the air guide passage and the intake passage opening of the engine are connected by an air guide duct or the like, the air that has passed through the radiator does not mix with the air from the air guide passage. Cold air is more reliably supplied by the engine.

Further, in the present invention, since the structure in which the wind guide attachment is detachably attached to the front portion of the vehicle body frame is adopted, the vehicle body frame itself can remain in a substantially normal form, and the vehicle body frame itself can be extended forward. The structure of the vehicle body frame is simpler than that of the conventional device.

Further, in the present invention, since the shape of the wind guide attachment surrounds the left and right fork bodies without hindering the steering operation, there is no problem of interference with the fork body. A sufficient passage area can be secured, and therefore a large amount of traveling wind can be introduced.

Further, in the present invention, since the air guide attachment surrounds the head pipe, the fork main body, etc., when the air guide attachment itself is formed with high rigidity, the air guide attachment causes the vicinity of the head pipe of the vehicle body frame. The rigidity of can be improved.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show a first aspect of the invention of claim 1.
It is a figure for explaining the wind guide device of the motorcycle by an example, and Drawing 1 and Drawing 2 are a top view, a side view, and Drawing 3 is II of Drawing 1.
A sectional view taken along the line I-III, and FIG. 4 is a left side view of the motorcycle.

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 head pipe 3 and a pair of left and right main frames 4 and 4 extending rearward and obliquely downward from the head pipe 3,
The rear arm brackets 5 and 5 are connected to the rear ends of the main frames 4 and 4, and the rear arm brackets 5 and 5 are integrally connected by a cross member.

By the head pipe 3, the front wheel 6 is provided at the lower end.
A steering shaft 7a of a front fork 7 that pivotally supports the front fork 7 is pivotally supported to the left and right, and the rear arm bracket 5 allows a rear arm 9 that pivotally supports a rear wheel 8 at a rear end to swing up and down. It is pivotally supported.

An engine 10 is suspended and supported below the vehicle body frame 2, and a fuel tank 11 is above the engine.
Is mounted, and a seat 12 is disposed behind the tank 11. Around the seat 12 is a side cover 13
It is surrounded by. Furthermore, the body frame 2, the engine 10, and the upper portion of the front fork 7 are surrounded by a cowling 14.

The engine 10 is a water-cooled two-cycle V
A four-cylinder engine, in which upper cylinder body 16 and lower cylinder body 17 are fastened to the upper and lower front parts of crankcase 15 so as to form a pair of left and right cylinders at a predetermined bank angle. Cylinder head 1
It has a structure in which 8 is attached.

Upper and lower exhaust pipes 19 and 20 are connected to the rear side and the bottom side of each cylinder body, respectively, in pairs of left and right, respectively. The upper exhaust pipe 19 extends obliquely upward from between the main frames 4 and 4 through the inside of the side cover 13, and the lower exhaust pipe 20 passes under the crankcase 15 to the left of the rear arm 9. , The right side extends diagonally upward.

Upper and lower throttle bodies 21 and 22 are connected to a portion sandwiched by the upper and lower cylinder bodies 16 and 17 of the crankcase 15 through joints. A pair of left and right radiators 23, 23 are arranged in front of the throttle bodies 21, 22.

Front portions 4a, 4 of the main frames 4, 4
The a and the head pipe 3 are integrally formed by casting. Further, the rear edges of the front portions 4a, 4a are arcuate in plan view, and the bottom wall 4b and the top wall 4c are fixed to the arcuate portions. As a result, the joint portion of the head pipe 3 of the main frame 4 has a box shape. The bottom wall 4b is formed with an escape recess 4e for avoiding interference with the radiators 23, 23, and a blower port 4d is formed between the escape recesses 4e, 4e of the bottom wall 4b. The air outlet 4d is connected to the throttle bodies 21 and 22 by an air duct 24. The casting range of the front portions 4a, 4a may be only the front side of the portion shown by the two-dot chain line in FIG. In this way, the mold can be made smaller accordingly.

As described above, the head pipe 3 is provided with a pair of bearings 25, which are located above and below the steering shaft 7a of the front fork 7.
It is pivoted at 25. An air guide recess 3a is provided in a portion of the head pipe 3 between the bearings 25, 25. The air guide hole 3a and the front portion 4a of the main frame 4 are provided.
The space leading to the side wall 4f, the box-shaped portion of the head pipe joint, and the path to the blower port 4d serve as an air guide passage 2a for supplying traveling wind to the vicinity of the engine.

A wind guide attachment 26 for introducing the traveling wind into the wind guide passage 2a is detachably attached to the front portion of the vehicle body frame 2. The wind guide attachment 26 is of a duct type, and is located laterally of the left and right fork main bodies 7b, 7b of the front portions 4a, 4a of the left and right main frames 4, 4 and the head pipe 3 and the front fork 7. And has a shape that extends further forward. The air guide attachment 26 is composed of three parts, left and right duct portions 27, 27 surrounding the fork body and the like, and an introducing duct portion 28 extending further forward. Note that these three parts may be integrally formed.

The left and right duct parts 27, 27 are integrally fastened to each other by a coupling bolt 29a and attached to the side wall 4f of the front part 4a.
It is fixed by tightening at b. This left, right duct part 27,
Reference numeral 27 is a duct-shaped member having a height about half that of the front portion 4a of the main frame 4, and a cocoon-shaped insertion hole 27a through which the fork body 7b is inserted without hindering the steering operation. Are formed through.

The introduction duct portion 28 is attached to the front end faces of the left and right duct portions 27, 27 with bolts 29c, and the air guide port 28a formed at the front end thereof is inserted into the front end opening 14a of the cowling 14. It is exposed to the outside and supports the front part of the cowling 14.

Next, the function and effect of this embodiment will be described. In order to mount the wind guide attachment 26 on the vehicle body frame 2 in the wind guide device of this embodiment, the left and right duct portions 27, 27 are used.
They are fastened together by bolts 29a to be integrated with each other, and the introduction duct portion 28 is provided on the front end faces of the left and right duct portions 27, 27.
Is fixed by tightening the bolt 29c. Then, this assembly is fastened and fixed to the side walls 4f of the left and right main frames 4 and 4 with bolts 29b. The left and right duct parts 27, 2
7 separately attached to the side wall 4f, and then the introduction duct part 2
8 may be attached. Also, this wind guide attachment 2
After mounting 6, the front fork 7 is mounted on the body frame 2.

In the apparatus of this embodiment, traveling wind is introduced from the introduction duct section 28 into the left and right duct sections 27, 27,
A part of the air flows from the central portion of the left and right duct portions 27, 27 into the box-shaped portion of the main frame 4 through the air guide concave portion 3a of the head pipe 3, and from the air outlet 4d of the air guide duct 24. Is supplied to the engine 10 via. Therefore, the low-temperature running air can be supplied to the engine without being mixed with the hot air that has passed through the radiator 24, and the charging efficiency of the engine can be improved.

Further, in this embodiment, the air guide attachment 2
Since the structure in which 6 is detachably attached to the front portion of the vehicle body frame 2 is adopted, the vehicle body frame 2 itself remains in a substantially normal form, and the vehicle body frame itself is compared to a conventional device in which the vehicle body frame itself is extended forward. The structure of 2 is simple.

Further, in this embodiment, the wind guide attachment 2
The shape of 6 encloses the left and right fork main bodies 7b, 7b without hindering the steering operation, so that a passage can be formed on the outside of the fork main body 7b. A sufficient passage area can be secured without causing a problem of interference, and therefore a large amount of traveling wind can be introduced.

Furthermore, in the present embodiment, the air guide attachment 26 is shaped so as to surround the head pipe 3, the fork main body 7b, etc. Therefore, when the air guide attachment 26 itself is formed with high rigidity, the air guide attachment 26 is used. The rigidity of the body frame 2 near the head pipe 3 can be improved.

FIGS. 5 and 6 are views showing a second embodiment according to the invention of claim 2, wherein the same reference numerals as those in FIGS. 1 to 4 designate the same or corresponding parts.

A duct connecting portion 30 is integrally formed with the head pipe 3 by casting at the front portions of the side walls 4f of the left and right main frames 4 and 4. The duct connection portion 30,
Reference numeral 30 has a connection surface that crosses the substantially axial center of the head pipe 3 in the vehicle width direction, and the air guide attachment 32 is detachably connected to the connection surface. This wind guide attachment 32 is
Introducing duct part (not shown) having the same structure as that of the first embodiment
And an intermediate duct portion 31 located between the introduction duct portion and the duct connecting portion 30. The intermediate duct portion 31 is connected to the duct connecting portion 30 with a bolt 29b. The intermediate duct portion 31 and the duct connection portion 30 have recesses 31a and 30a, respectively, which form an insertion hole 27a into which the fork body 7b is inserted.

In the second embodiment, similar to the first embodiment, low-temperature running air can be supplied to the engine to improve the charging efficiency, and the air guide passage area can be expanded to increase the air guide amount. There is.

Further, the duct connecting portion 30 is connected to the main frame 4
Since it is integrally formed in the front part of the, the rigidity near the head pipe 3 can be improved by the air guide attachment 32, and
It can also be improved by the duct connection portion 30.

Furthermore, in the second embodiment, the insertion hole 27a of the fork body 7b is formed in the recess 30 of the duct connecting portion 30.
Since it is formed by a and the concave portion 31a of the intermediate duct portion 31,
The wind guide attachment 32 can be attached and detached with the front fork 7 mounted on the vehicle body frame 2, and a reduction in assembly workability due to the provision of the wind guide passage surrounding the fork main body 7b can be avoided.

[0034]

As described above, according to the wind guide system for a motorcycle according to the present invention, since the wind guide attachment is detachably attached to the front portion of the vehicle body frame, low-temperature running wind can be introduced near the engine. In addition, since the air guide attachment has a shape that surrounds the head pipe and the left and right fork main bodies without hindering the traveling operation, the air guide passage area can be increased while avoiding interference with the fork main body. There is an effect that can increase.

[Brief description of drawings]

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

FIG. 2 is a side view of the device of the first embodiment.

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

FIG. 4 is a left side view of a motorcycle that employs the device of the first embodiment.

FIG. 5 is a plan view of a wind guide device for a motorcycle according to a second embodiment of the present invention.

FIG. 6 is a side view of the device of the second embodiment.

[Explanation of symbols]

 1 Motorcycle 2 Body Frame 2a Air Guide Channel 3 Head Pipe 4 Main Frame 4a Front of Main Frame 7 Front Fork 7a Fork Main Body 10 Engine 26 Air Guide Attachment 27a Insertion Hole 28a Air Guide Port 30 Duct Connection Section 32 Air Guide Attachment

Claims (2)

[Claims] 1. A wind guide for introducing traveling wind near an engine mounted below a main frame of a motorcycle having a body frame formed by extending a pair of left and right main frames rearward from a head pipe. In the device, a wind guide attachment is detachably attached to a front portion of the vehicle body frame, and the wind guide attachment continuously surrounds the front portion of the main frame, the head pipe, and the left and right sides of the front fork. A duct-like member that extends forward and has a wind guide at the front end is formed, and the wind guide attachment is formed with an insertion hole through which the pair of left and right fork bodies of the front fork are inserted without hindering the steering operation. An automatic guide characterized in that a wind guide passage for guiding the traveling wind introduced by the wind guide attachment to the vicinity of the engine is formed in the front part of the vehicle body frame. Wind guide device for wheeled vehicles. 2. A wind guide for introducing a running wind near an engine mounted below the main frame of a motorcycle having a body frame in which a pair of left and right main frames are extended rearward from a head pipe. In the device, a pair of left and right duct connecting parts are integrally formed on the front part of the main frame, and a wind guide attachment is detachably attached to the duct connecting part, and the air guide attachment and the duct connecting part are connected to the head. The pipe and the front fork are surrounded by the left and right sides, extend further toward the front of the vehicle, and have a duct shape with a wind guide port at the front end. Form an insertion hole to insert without disturbing the direction movement,
A wind guide device for a motorcycle, characterized in that an air guide passage is formed in the front part of the duct connecting part and the body frame to guide the traveling wind introduced by the wind guide attachment to the vicinity of the engine.