JPH042868Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is based on a system in which the front part of the vehicle body is covered with a body cover, and the fuel tank is mounted on a pair of left and right main frames that extend toward the rear of the vehicle body and are connected to the head pipes. It relates to a small vehicle with a structure in which an engine and an intake device for the engine are located below a fuel tank, and at least a part of the intake device is located between the left and right main frames, and in particular, the engine releases air to the intake device. This relates to a ventilation structure to reduce the effects of heat.

[Prior art and problems to be solved] In small vehicles such as motorcycles, a fuel tank is mounted on the main frame, an engine is placed below it, and the front part of the vehicle body including the engine is covered with a body cover. The aim was to lower air resistance and reduce the amount of wind blowing on the driver.

An air guide port was provided at the front of the vehicle body cover, and running air was introduced into the cover through the air guide port to cool the engine.

However, the air inside the vehicle body cover, which is heated by heat exchange with the engine, tends to accumulate inside the vehicle body cover, especially when the muffler is placed below the seat and its sides are covered with a frame cover. This tendency is strong, and as a way to deal with this, Jikaisho
There is one described in Publication No. 61-27778.

According to this publication No. 61-27778,
An air guide tube oriented in the front-rear direction is arranged along the inner surface of the vehicle body cover, with the front end opening of the air guide tube facing the air guide port of the vehicle body cover, and the air guide tube is placed inside the frame cover that covers the muffler. The rear end is open,
A part of the running air introduced into the vehicle body cover from the air guide port of the vehicle body cover is introduced into the space around the muffler through the air guide tube, thereby cooling the space around the muffler.

However, in order to cool the high-temperature air around the muffler that is heated by high-temperature exhaust gas, it is necessary to cool the air outside the car body cover by using the heat radiated from the engine itself near the air outlet in the space surrounded by the car body cover or by heat exchange with the radiator. Although a considerable cooling effect can be obtained by supplying air heated to a higher temperature than the air around the muffler through the air guide tube, supplying such high-temperature air to the intake system will cause damage to the engine. Not only does the actual intake air amount decrease and the intake air filling efficiency decrease, but also the air heat ratio changes and the engine output inevitably decreases.

In addition, dust, mud, water, etc. accumulate inside the vehicle body cover and are difficult to be discharged to the outside, so that the air intake device inhales them, placing a heavy burden on the air purifier.

[Means and effects for solving the problem] The present invention relates to an improvement of the intake structure of an air supply system in a small vehicle that overcomes the above-mentioned difficulties. A fuel tank is mounted on a pair of left and right main frames that extend toward the rear of the vehicle body, and a water-cooled engine and an intake device for the engine are located below the fuel tank, and at least a portion of the intake device is located below the fuel tank. In a small vehicle that is located between the left and right main frames and has an engine cooling radiator located at the front inside the vehicle body cover, a pair of air intake ports located on both sides of the headlights and above the front wheels are located on the vehicle body. The rear end of the air guide tube, which is formed on the cover and connected to the air intake and whose front end opens outward from the vehicle body cover, is connected to the outermost end in the vehicle width direction of the front half of the vehicle body frame, which has an open leg shape in plan view. This is also characterized in that it is attached to the outer surface of the vehicle body frame at a position on the front side of the vehicle body.

In the present invention, a pair of air intake ports located on both sides of the headlight and above the front wheels are formed in the vehicle body cover, and the rear end of the air guide tube is connected to the air intake ports and has a front end opening outside the vehicle body cover. is attached to the outer surface of the vehicle body frame at a position forward of the vehicle body from the outermost end in the vehicle width direction of the front half of the vehicle body frame, which has a split-leg shape in plan view, so that the air temperature in the space surrounded by the vehicle body cover is As the small vehicle moves, the air outside the vehicle body cover, which is cooler and cleaner with less dust, mud, water, etc., is sufficiently introduced into the space above the engine where the intake device is located, and the air generated by the engine in the space is It is possible to effectively dispel hot air, suppress increases in the temperature within the space and the temperature of the intake system, and prevent a decrease in the intake air filling rate due to a decrease in the actual intake air amount and a decrease in engine output due to changes in the air-fuel ratio. It is possible to fully bring out the inherent performance of the engine.

In addition, the rear end of the wind guide tube was attached to the outer side of the main frame at a position forward of the vehicle body than the outermost end in the vehicle body direction of the front half of the body frame, which has a split-leg shape in plan view. The amount of outward protrusion in the width direction is small,
It does not affect the riding position considering interference with the driver's legs, and the support structure of the wind guide tube is simple.
Effects such as the ease of attaching and detaching the wind guide tube and the ease of maintenance work can be obtained.

[Example] An example shown in FIGS. 1 to 9 will be described below.

FIG. 1 shows a schematic left side view of a motorcycle 10 in which a front and rear V-type engine E is mounted between the front and rear wheels FW and RW, and the front part of the vehicle body is covered with a vehicle body cover 34 (cowling). Motorcycle 10
The vehicle body frame includes a head pipe 12 that rotatably supports the steering wheel rotation shaft, and a head pipe 12 that rotatably supports the handle rotation shaft.
A pair of left and right main frame pipes 14 with a rectangular cross section extend toward the rear of the vehicle body in a V-shape in plan view, a center pillar 18 that extends to the rear end of the main frame pipes 14, and a head pipe 12. A pair of left and right down tubes 1 extend downward in a series of inclined positions, and the engine E is suspended from the lower ends of the down tubes 1.
6, a pair of left and right back stays 20 that are connected to the center pillar 18 and extend toward the rear of the vehicle body in an upright tilted position, and a back stay 20 that is connected to the main frame pipe 14 and extends toward the rear of the vehicle body at its rear end.
The main frame pipes 14 on the left and right sides of the vehicle body are formed as main members with a pair of left and right seat support pipes 22 connected to the head pipes 12.
and the down tube 16 are interconnected by a reinforcing member 24.

In addition, a carburetor 26 is disposed between the cylinders C ₀ and C ₁ of the engine E located at the front and rear, and
An air purifier 28 is arranged above the vaporizer 26,
and a fuel tank 3 that covers the air purifier 28 from above.
2 are placed and fixed on the left and right main frame pipes 14.

The front left and right (headlights) of the vehicle body cover 34 that is supported by the vehicle body frame and covers the front of the vehicle
An air intake port 36 is formed on the left and right sides of the vehicle body cover 34, and the front end 40 of the air guide tube 38 that captures and guides the traveling wind passing through the air intake port 36 is in close contact with the inner wall of the vehicle body cover 34, and is positioned at the leading edge. The formed tongue piece 41 fits and locks into the vehicle body cover 34 through the engagement and locking relationship between the formed tongue piece 41 and the U-shaped wall 34a protruding from the wall surface on the vehicle center side of the inlet wall 34A located inside the air intake port 36. (See Figure 2a. R in the figure is a buffer rubber). The wind guide tube 38 is shown in FIGS. 3 to 6 (the left and right wind guide tubes 38 are symmetrical in shape, so only the left side wind guide tube 38 is shown. However, FIG. 4 shows the - in FIG. 3).
As shown in the cross-sectional view taken along the line, FIG. 5 is a sectional view taken along the line - in FIG. 4, and FIG. It is formed as a rectangular cylinder, and the rear end of the main body 4
A plate-like louver 44 is integrally attached to the second part. The plate-like louver 44 includes a plurality of directional walls 54, and the rear end 42 of the main body is fitted into an annular locking groove 46 formed to surround the directional walls 54.
By locking, the air guide tube main body and the plate-shaped louver 44 are integrally coupled (see FIG. 6).

The plate-shaped louver 44 is shown in FIGS. 6 to 9 (however, FIGS.
The main frame pipe 14 is formed as a substantially triangular body, as shown in FIG.
It is fitted into a triangular space defined by the down tube 16 and the reinforcing member 24 (see FIG. 2),
A pin 48 protruding from the upper side is inserted into a locking hole provided on the lower wall of the main pipe 14, and
Tongue pieces 50 and 52 protruding from the lower side are engaged with the down tube 16 and the reinforcing member 24. The triangular space portion where the plate-shaped louver 44 is attached is the left and right down tube 1 shown in FIG.
6, the left and right main frame pipes 14, which have a split-leg shape in plan view and are connected to the head pipes, are positioned further forward of the vehicle body than the outermost ends in the vehicle width direction, and the rear end 42 of the wind guide tube 38 is It is located on the outer side of the frame pipe 14 and down tube 16 (sixth
figure). In this state, the rear ends of the left and right wind guide tubes 38 are deflected toward the rear of the vehicle and are directed toward the center of the vehicle in the vehicle width direction, and the rear ends of both wind guide tubes 38 are opened in the same direction. has been done. Here, the expression "open" is an expression when the plate-like louver 44 is not considered.
The direction of the rear end 42 is shown.

Further, the directional wall 54 of the plate-shaped louver 44 gives directionality to the traveling wind flowing inside the wind guide tube 38 and discharged from the plate-shaped louver 44, so that the traveling wind flows through the carburetor 26.
It seems to flow to the side.

Furthermore, located between the left and right reinforcing members 24,
Its lower side is supported by the carburetor 26, and its upper side is supported by the left side,
A membrane wall 56 made of a flexible material (for example, rubber) supported by a horizontal member (not shown) attached to connect the right down tube 16 is arranged in an upwardly curved shape. (See Figure 2). In addition, in FIG. 2, 30 indicates the intake pipe of the air cleaner 28 extending between the left and right main frame pipes 14, and its front end intake port is at the height of the lower wall surface of the left and right main frame pipes 14. It is located at a high standard.

The present embodiment is constructed as described above, and when the motorcycle 10 is traveling, the traveling wind A enters the wind guide tube 38 from the air intake port 36 of the vehicle body cover 34, and is caused by the action of the directional wall 54. The traveling wind B blown out from the louver 44 changes its flow direction and flows toward the carburetor 26, dispelling the hot air dissipated from the cylinders C ₀ and C ₁ of the engine E and effectively raising the temperature of the carburetor 26. suppress.

In addition, the intake pipe 30 of the air purifier 28 has its intake port located on the side with respect to the flow direction of the traveling wind B, so that the air purifier 28 is not directly affected by the wind pressure of the traveling wind B. Cold air is sucked inside.

In this way, in this embodiment, not only the temperature rise of the carburetor 26 is suppressed, but also cold air is supplied to the air purifier 28, so that a decrease in the actual intake air amount can be prevented, and the influence on the air-fuel ratio can be sufficiently reduced. It is therefore possible to fully bring out the inherent performance of the engine E.

Other features of this embodiment are as follows.

The plate-shaped louver 44 attached to the rear end of the main body of the wind guide tube 38 is shaped like an open leg in plan view to form the head pipe 1.
Since the left and right main frame pipes 14 connected to the left and right main frame pipes 14 are attached to the vehicle body frame at a position forward of the vehicle body relative to the outermost ends in the vehicle width direction, the amount of protrusion of the wind guide tube 38 outward in the vehicle width direction is small, making driving easier. Riding position that takes into account interference with the rider's legs (riding position...
Specifically, it does not affect the driver's seat position.

Connect the rear end of the wind guide tube 38 to the main frame pipe 1
4, 16 and the reinforcing member 24, the support structure of the wind guide tube 38 is simple, and the attachment and detachment of the wind guide tube 38 is easy. , maintenance workability is good.

Since the wind guide tube 38 has a dogleg-shaped curved shape, if rainwater or the like enters the wind guide tube 38 along with the wind while driving, it will be removed by inertial collision and the clean air will be purified. It is fed to the container 28 side.

The membrane wall 56 prevents turbulence in the running wind B and
6, it is possible to improve the effect of dispelling hot air around the down tube 16, and also to block the hot air radiated from the radiator 58 provided in the front of the down tube 16, and to eliminate the thermal influence on the air purifier 28 and the vaporizer 26, which are intake devices. can.

[Brief explanation of the drawing]

FIG. 1 is a schematic left side view of a motorcycle that employs a ventilation structure according to an embodiment of the present invention, FIG. 2 is an enlarged view of its main parts, and FIG. 3 is a component of the ventilation structure. A side view of the wind guide tube, FIG. 4 is a view taken along the - line, and FIG. 5 is a sectional view taken along the line - in FIG. 4.
6 is a cross-sectional view corresponding to the - line in FIG. 2, FIG. 7 is a view taken along the - line in FIG. 6, FIG. 8 is a view taken along the - line in FIG. - It is a line arrow view. 10...Motorcycle, 12...Head pipe,
14... Main frame pipe, 16... Down tube, 18... Center pillar, 20... Back stay, 22... Seat support pipe, 24... Reinforcement member, 26... Carburizer, 28... Air purifier, 3
0... Intake pipe, 32... Fuel tank, 34... Vehicle body cover, 36... Air intake, 38... Wind guide tube, 40
... front end, 42 ... rear end, 44 ... plate-shaped louver, 46 ... annular locking groove, 48 ... pin, 50,
52... Tongue piece, 54... Directional wall, 56... Membrane wall,
58...Radiator, E...Engine, C ₀ , C ₁
……cylinder.

Claims (1)

[Scope of claim for utility model registration] (1) The front part of the vehicle body is covered with a vehicle body cover, and
A fuel tank is mounted on a pair of left and right main frames that extend toward the rear of the vehicle body and are connected to the head pipe, and a water-cooled engine and an intake device for the engine are located below the fuel tank, and at least a portion of the intake device is located below the fuel tank. In a small vehicle where the engine cooling radiator is located between the left and right main frames and the engine cooling radiator is located at the front inside the vehicle body cover, a pair of air intake ports located on both sides of the headlight and above the front wheels are installed. The rear end portion of the air guide tube formed on the vehicle body cover, connected to the air intake port, and the front end of which opens outward from the vehicle body cover, is the outermost end in the vehicle width direction of the front half of the vehicle body frame, which has an open leg shape in plan view. An intake structure for an air intake device in a small vehicle, characterized in that the intake device is attached to an outer surface of a vehicle body frame at a position closer to the front of the vehicle body. (2) The rear portions of the pair of left and right wind guide tubes are oriented toward the center of the vehicle body in the vehicle width direction in a posture that is deflected toward the rear of the vehicle body, and the rear ends of both wind guide tubes are open in the same direction. An air intake structure for an air intake device in a small vehicle as claimed in claim 1 of the registered utility model, characterized by: