JP3978335B2 - New air intake structure of scooter type motorcycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fresh air intake structure for a scooter type motorcycle.
[0002]
[Prior art]
In a scooter type motorcycle, fresh air sucked from an air duct is introduced into a belt cooling chamber in an air cleaner or transmission case, and the fresh air is used to form an air-fuel mixture in a carburetor or the like, or to cool a belt. It has been broken.
[0003]
By the way, as a new air intake structure in a scooter type motorcycle, for example, an intake port is connected to a joint portion provided on a back stay of a vehicle body frame, a frame pipe is used as an intake pipe, There are known ones that extend upward from the footboard footrest surface and are opened.
[0004]
[Problems to be solved by the invention]
However, in the former fresh air intake structure, since the strength load is easily applied to the connection portion of the intake port to the frame, the strength load of the connection portion is large, and the cross-sectional area of the ventilation pipe is small. There is a problem that it is limited by the size of the frame pipe and a large pipe cross-sectional area cannot be secured.
[0005]
In the latter new air intake structure, since the intake pipe having a large cross-sectional area passes through the center of the vehicle body, there is a problem that the shape and function of other vehicle body mounting parts such as a fuel tank are affected.
[0006]
The present invention has been made in view of the above-mentioned problems, and the purpose of the present invention is to take in fresh air of a scooter type motorcycle that can secure a large intake passage cross-sectional area and high dustproof and waterproof properties in a small space. To provide a structure.
[0007]
To achieve the above object, the present invention features a fuel tank disposed below the footboard, the fresh air is sucked from the air duct air cleaner, or the motorcycle scooter type to be introduced into the belt cooling chamber in the transmission case In the fresh air intake structure, the fuel tank includes a cover that covers an upper surface, left and right side surfaces, and a rear surface of the rear portion of the fuel tank, and a chamber chamber formed between the cover and the fuel tank. The gist of the present invention is that the air duct is formed by a cover and a rear surface of the fuel tank, and the air duct has a fresh air intake structure for a scooter type motorcycle that opens into the chamber chamber .
[0010]
Therefore, according to the present invention, a chamber chamber is formed by using a vehicle body mounting part such as a fuel tank disposed below the footboard, and from the air duct opening to the chamber chamber to the belt cleaner chamber of the air cleaner or transmission case. As a result, the large intake passage cross-sectional area can be secured in the minimum space.
[0011]
In addition, the opening of the chamber chamber to the atmosphere can be set at any location with the aim of the clean side, so it is possible to prevent dust and water from entering the air duct and ensure high dust resistance and waterproofness. .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0013]
FIG. 1 is a side view of a scooter type motorcycle having a fresh air intake structure according to the present invention, and FIG. 2 is a partial front sectional view of the front part of the scooter type motorcycle. Is outlined.
[0014]
A head pipe 2 is located at the front upper part of the vehicle body of the scooter type motorcycle 1 shown in FIG. 1, and a steering shaft 3 is rotatably inserted into the head pipe 2. A steering wheel 4 is attached to the upper end of the steering shaft 3, and a front fork 5 is attached to the lower end of the steering shaft 3, and a front wheel 6 is rotatably attached to the lower end of the front fork 5. It is supported.
[0015]
Further, after the down tube 7 extends obliquely downward toward the rear of the vehicle body from the head pipe 2, it is bent and extends substantially horizontally toward the vehicle body. A pair of backstays 8 branch off and extend obliquely upward toward the rear of the vehicle body.
[0016]
By the way, the head pipe 2, the down tube 7 and the like at the front of the vehicle body are covered with a resin front cover 9, and the rear half of the front cover 9 similarly constitutes a resin leg shield 10.
[0017]
Further, a tandem seat 11 is disposed behind the handle 4, and a low-floor type footboard (footrest) 12 is provided between the seat 11 and the handle 4. A fuel tank 13 as a vehicle body attachment part is disposed in a space below the foot board 12.
[0018]
A unit swing type engine 14 as a power unit is provided behind the foot board 12 and below the seat 11.
[0019]
The unit swing type engine 14 is disposed on the left side of the vehicle body, and is configured by integrating an engine 15 as a drive source and a transmission case 16 including a V-belt type automatic transmission (not shown) and a speed reduction mechanism. The transmission case 16 extends from the left side of the vehicle body of the engine 15 to the rear side of the vehicle body, and a rear wheel 17 is rotatably supported at the rear end thereof. An air cleaner 18 is attached to the upper portion of the transmission case 16, and an intake pipe 19 extending from the air cleaner 18 toward the front of the vehicle body is connected to the intake system of the engine 15, and a carburetor 20 is provided in the middle. ing. The air-fuel mixture formed in the carburetor 20 is supplied to the engine 15 of the unit swing type engine 14 for combustion.
[0020]
Although not shown, the transmission case 146 is formed with a belt cooling chamber for cooling the V belt of the V belt type automatic transmission, and a belt chamber cooling duct 46 extending from the front end of the transmission case 16 to the front of the vehicle body. The fresh air sucked into the transmission case 16 is introduced into the belt cooling chamber and used for cooling the V-belt.
[0021]
The unit swing type engine 14 having the above configuration is supported by an engine suspension bracket 21 fixed to the backstay 8 so as to be swingable up and down via a link mechanism 22, and its rear end together with the rear wheel 17 is rear. It is supported by the backstay 8 via the cushion 23.
[0022]
On the other hand, a portion of the vehicle body below the seat 11 is covered with a resin vehicle body cover 24, and a storage box 25 having an upper surface opened above and below the unit swing engine 14 in the vehicle body cover 24. Are attached to the backstay 8 via the attachment member 26 and the cross member 27. The storage box 25 extends long over the entire length of the seat 11 to secure a large capacity, and stores a half cap type helmet H1 and a full face type helmet H2 at the same time as shown in the figure. Can do. The seat 11 is supported on the storage box 25, and the front end of the seat 11 rotates up and down around the hinge 28 to open and close the storage box 25. In addition to the attachment member 26 and the cross member 27, a cross member 29 is installed on the left and right backstays 8, and a grab bar 30 is attached to the attachment member 26 and the cross member 27.
[0023]
By the way, in the scooter type motorcycle 1 according to the present embodiment, on the left side of the head pipe 2 in the space surrounded by the front cover 9 and the leg shield 10 at the front of the vehicle body, as shown in FIG. A small-capacity sub tank 31 is arranged, and a battery 32 is arranged on the right side of the head pipe 2.
[0024]
A flexible fuel hose 33 extending downward from the bottom of the sub tank 31 is connected to the large capacity main tank 13 disposed below the foot board 12. Here, an oil filler port 34 is provided obliquely on the upper front side of the sub tank 31, and a detachable tank cap 35 is attached to the oil filler port 34, and a filler 36 is provided around the oil filler port 34. Is provided so as to surround the fuel filler port 34.
[0025]
The filler 36 receives gasoline, which is fuel that has overflowed from the filler port during refueling. An overflow pipe 37 extends downward from the bottom of the filler 36, and the lower end of the overflow pipe 37 is located in front of the main tank 13. It opens to the atmosphere at the bottom of the vehicle body.
[0026]
A charge hose 38 extends downward from the upper part of the sub-tank 31, and the charge hose 38 is disposed obliquely on the left side of the main tank 13 disposed near the lower end of the down tube 7. 39 is connected to the rear surface.
[0027]
On the other hand, a fuel pump 42 is attached to the cross member 29 via a stay (not shown) below the front portion of the seat 11 and in the vicinity of the front end portion of the storage box 25 covered with the vehicle body cover 24. Has been. A negative pressure hose 43 extending from the intake system of the engine 15 is connected to the fuel pump 42. The fuel pump 42 is driven by the pulsation of the intake pressure, and gasoline is supplied from the fuel tank 13 through the fuel hose 44. The pressure of the fuel is increased by suction, and the gasoline is supplied to the carburetor 20 through the fuel hose 45 to form an air-fuel mixture.
[0028]
By the way, the canister 39 is a device for separating the vaporized gasoline introduced from the sub tank 31 through the charge hose 38 into gasoline and air, which is the lowermost part of the vehicle body, that is, the down tube 7 as described above. The fuel tank 13 disposed in the vicinity of the lower end is disposed obliquely on the left side of the fuel tank 13 so as to descend toward the front of the vehicle body.
[0029]
The air hose 40 extending obliquely downward from the front surface of the canister 39 toward the front of the vehicle body is connected to the lower end portion of the overflow pipe 37, and the purge hose 41 led out from the rear surface of the canister 39 is obliquely upward toward the vehicle body direction. It extends and has its end connected to the carburetor 20.
[0030]
Here, the details of the fresh air intake structure according to the present invention will be described with reference to FIGS. 3 is a partial side view of the scooter type motorcycle, FIG. 4 is a partial plan view thereof, FIG. 5 is a view in the direction of arrow A in FIG. 3, FIG. 6 is a sectional view taken along line BB in FIG. 3 is a cross-sectional view taken along the line CC of FIG. 3, FIG. 8 is a detailed cross-sectional view of a portion D of FIG. 3, FIG. A side view and FIG. 12 are plan views of the cover.
[0031]
As shown in FIGS. 3 and 4, a rubber cover 47 is placed and fixed on the upper surface of the rear portion of the fuel tank 13 disposed below the footboard 12, except for the bottom surface of the rear portion of the fuel tank 13. The upper surface, the left and right side surfaces, and the rear surface are covered with a cover 47.
[0032]
Here, the details of the structure of the cover 47 are shown in FIGS. 10 to 12. The cover 47 is integrally formed in a reverse channel shape by heat-resistant high rubber and protrudes substantially horizontally from the left and right sides. An engaging projection 47b protrudes downward from the tip of the arm portion 47a. As shown in FIG. 12, a horizontal mounting portion 47c is formed on the upper surface of the left rear end of the cover 47, and a circular hole 47d is formed in the mounting portion 47c.
[0033]
Further, two left and right circular holes 47f (see FIG. 10) are formed in the lower end portion of the rear wall 47e extending vertically downward from the rear portion of the cover 47.
[0034]
Thus, the cover 47 configured as described above is placed on the upper surface of the rear portion of the fuel tank 13, and as shown in FIGS. 3 and 7, is protruded from the arm portion 47a extending forward from the front end thereof. Further, the front left and right sides are fixed to the fuel tank 13 by inserting the engaging protrusions 47b into the circular holes 13a formed in the flange portion of the fuel tank 13 from above to engage with each other.
[0035]
Further, as shown in FIG. 8, the cover 47 is engaged by passing a circular hole 47d formed in the mounting portion 47c through an engagement protrusion 46a provided in the belt chamber cooling duct 46, thereby allowing the cover 47 to engage. The upper surface of the left rear end is fixed to the belt chamber cooling duct 46.
[0036]
Further, as shown in FIG. 3, the rear wall 47e of the cover 47 is fixed to the vehicle body side by inserting a protrusion 48 on the vehicle body side into the circular hole 47f drilled therein.
[0037]
Thus, when the cover 47 is fixed and covers the rear portion of the fuel tank 13 as described above, the bottom of the footboard 12 is located between the cover 47 and the fuel tank 13 as shown in FIGS. A chamber chamber S is formed in the chamber. As shown in FIG. 5, an intake opening S1 formed between the cover 47 and a part of the upper surface of the fuel tank 13 is opened on the front surface of the chamber S, as shown in FIG. Further, an intake opening S2 formed between the left side surface of the fuel tank 13 and the cover 47 is opened.
[0038]
As described above, the chamber chamber S is formed below the footboard 12 between the cover 47 and the fuel tank 13. As shown in FIG. 6, the front end of the transmission case 16 of the unit swing engine 14 is formed. The belt chamber cooling duct 46 extending from the front to the front of the vehicle body opens at the left end of the chamber chamber S in the cover 47.
[0039]
Thus, when the unit swing type engine 14 is started and a fan (not shown) housed in the transmission case 16 is driven to rotate, fresh air is generated by the negative pressure generated in the belt cooling chamber of the transmission case 16 by the footboard. 12 is sucked into the chamber S from the openings S1, S2 of the chamber S formed below. Then, the fresh air sucked into the chamber chamber S is introduced into the belt cooling chamber in the transmission case 16 through the belt chamber cooling duct 46 opened to the chamber chamber S to be used for cooling the V belt. The air warmed by the cooling is discharged into the atmosphere from a discharge port (not shown) that opens in the transmission case 16.
[0040]
As described above, according to the present embodiment, the chamber chamber S is formed between the cover 47 using the fuel tank 13 disposed below the footboard 12, and the belt chamber that opens to the chamber chamber S is cooled. Since fresh air is introduced from the duct 46 to the belt cooling chamber in the transmission case 16, a large intake passage is provided in the minimum space below the footboard 12 without affecting the shape and function of the fuel tank 13 and the like. A cross-sectional area can be secured, and the necessary and sufficient fresh air can be supplied to the belt cooling chamber in the transmission case 16 to cool the V belt efficiently.
[0041]
Moreover, since the opening of the chamber chamber S formed below the footboard 12 to the atmosphere can be set at an arbitrary place with the aim of the clean side, dust and water intrusion into the belt chamber cooling duct 46 is prevented. High dustproofness and waterproofness can be ensured.
[0042]
In the present embodiment, an embodiment in which the present invention is applied to a fresh air intake structure in which a belt cooling duct 46 is opened in the chamber chamber S and fresh air is introduced into the belt cooling chamber in the transmission case 16 will be described. However, the present invention is similarly applicable to a fresh air intake structure in which an air cleaner duct extending from the air cleaner is opened in the chamber chamber to introduce fresh air into the air cleaner.
[0043]
【The invention's effect】
As is apparent from the above description, according to the present invention, the vehicle body mounting component is disposed below the footboard, and the scooter type automatic that introduces fresh air sucked from the air duct into the belt cooling chamber in the air cleaner or transmission case. In the two-wheeled vehicle fresh air intake structure, a chamber chamber is formed with the vehicle body mounting component below the footboard, and the air duct is opened in the chamber chamber. The effect that dustproofness and waterproofness can be ensured is obtained.
[Brief description of the drawings]
FIG. 1 is a side view of a scooter type motorcycle.
FIG. 2 is a partial front sectional view of a scooter type motorcycle.
FIG. 3 is a partial side view of a scooter type motorcycle.
FIG. 4 is a partial plan view of a scooter type motorcycle.
5 is a view in the direction of arrow A in FIG. 3;
6 is a cross-sectional view taken along line BB in FIG.
7 is a cross-sectional view taken along the line CC of FIG. 3;
FIG. 8 is a detailed cross-sectional view of a D part in FIG. 3;
9 is a cross-sectional view taken along the line EE of FIG.
FIG. 10 is a front view of a cover.
FIG. 11 is a side view of the cover.
FIG. 12 is a plan view of the cover.
[Explanation of symbols]
1 Scooter type motorcycle 12 Footboard 13 Fuel tank (body mounting parts)
16 Transmission case 18 Air cleaner 46 Belt chamber cooling duct (air duct)
47 Cover S Chamber room

Claims (4)

In a fresh air intake structure for a scooter type motorcycle in which a fuel tank is arranged below the footboard and fresh air sucked from an air duct is introduced into an air cleaner or a belt cooling chamber in a transmission case.
A cover that covers the upper surface, the left and right side surfaces, and the rear surface of the rear portion of the fuel tank;
A chamber chamber formed between the cover and the fuel tank;
The chamber chamber is formed by the cover and the rear surface of the fuel tank,
The air intake structure for a scooter type motorcycle, wherein the air duct opens into the chamber chamber. The chamber chamber is disposed behind the fuel tank,
The fresh air intake structure for a scooter type motorcycle according to claim 1, wherein the belt cooling chamber is disposed behind the chamber chamber. The chamber chamber is disposed behind the fuel tank,
The fresh air intake structure for a scooter type motorcycle according to claim 1, wherein the air cleaner is disposed behind the chamber chamber.   The fresh air intake structure for a scooter type motorcycle according to any one of claims 1 to 3, wherein the cover is attached to the fuel tank.

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