CN1169930A - Intake structure of intake air of scooter - Google Patents

Abstract

The invention provides an air inhalation structure of a small motorcycle that can prevent dust inhalation, reduce air inhalation resistance and increase engine output power. In order to introduce intake air into the air cleaner 37 supported on the upper portion of the transmission case 30 of the power unit P, an intake box 40 and an intake duct 38 facing the opening ₁₃₂ formed in the vehicle body side cover 13 are provided. The front end of the air suction conduit 38 is connected to the air suction box 40 through a sleeve 39 , and the rear end is connected to the inlet of the air filter 37 . The suction box 40 supplies the suction gas sucked from the inlet opening ₅₂₁ at the low position to the suction duct 38 at the high position, and the suction duct 38 has no sharp bend, but is arranged at the shortest distance along the front and rear direction of the vehicle body.

Description

Intake structure of intake air of scooter

The invention relates to an air intake structure of a small motorcycle, which supports an air filter above a power unit transmission box pivotally supported at the rear of the vehicle body in a freely swingable up and down manner. Suction air through the suction catheter.

Such an air intake structure is disclosed in, for example, Japanese Patent Application Laid-Open No. 64-22692. In this structure, in the front part of the storage box provided at the lower part of the vehicle seat, an air suction channel with an air suction port at the upper end is formed along the vertical direction, and the front end of the air suction duct extending forward from the air filter is connected to the air suction channel. The lower end of the air passage is connected.

However, in the above-mentioned prior art, since the air suction port is arranged at a higher position from the road surface, the advantage is that the inhalation of dust can be prevented. Moreover, the air-intake passage and the air-intake duct are connected at right angles, thereby also causing the problem that the output power of the engine is reduced due to the increase of the inhalation resistance of the air-intake.

In view of this, the object of the present invention is to provide an air intake structure for a small motorcycle that can prevent dust inhalation and reduce air intake resistance, thereby increasing engine output.

In order to achieve the above object, the air intake structure of the small motorcycle provided in claim 1 is above the transmission box of the power unit pivotally supported at the rear of the vehicle body in a freely swingable up and down manner, and an air filter is supported. The air filter sucks air through the suction duct, and is characterized in that an opening is formed on the body cover for covering the side part of the vehicle body under the seat behind the pedal, inside the aforementioned body cover, facing the aforementioned The opening is provided with a suction box, and the aforementioned suction conduit is connected with the suction box.

The invention described in claim 2 is made on the basis of claim 1, wherein the air intake box has an inlet opening provided on its side and an outlet opening provided on its top, and the inlet opening faces the side of the vehicle body cover. Opening, meanwhile, the outlet opening is connected with the suction duct.

The invention described in claim 3 is based on claim 2, wherein the suction box is divided into a lower chamber having the inlet opening and an upper chamber having the outlet opening, and the lower chamber and the upper chamber communicate with each other. The hole is provided at a lower position than the lower end of the inlet opening of the suction box.

The invention described in claim 4 is made in addition to claim 3, wherein the lower portion of the lower chamber is provided with an opening for pressure release.

The invention described in claim 5 is based on claim 1, and the auxiliary pedal for the rear seat rider protrudes to the outside of the vehicle body cover through the opening of the vehicle body cover.

As described above, according to the invention described in claim 1, since an opening is formed on the vehicle body cover for covering the side portion of the vehicle body under the seat behind the pedals, the rear surface of the vehicle body cover is provided facing the opening. There is a suction box to which the suction duct is connected, so that the suction duct connecting the air filter arranged above the transmission box of the power unit to the suction box can be arranged in a straight line and at the shortest distance in order to reduce Increase the output power of the engine by reducing the suction resistance. Moreover, since the opening of the body cover facing the suction box is provided under the seat behind the pedals, not only is it difficult to inhale dust or muddy water splashed by the front or rear wheels, but it is also possible to inhale air that is not heated by the engine. Low temperature air, thereby increasing the output power of the engine.

According to the invention described in claim 2, since the suction box has an inlet opening provided on its side and an outlet opening provided on its top, the inlet opening faces the opening of the vehicle body cover, and the outlet opening is in contact with the suction box. The air duct is connected, so dust, etc. in the air sucked into the suction box will fall to the bottom of the suction box, preventing it from being sucked into the air filter.

According to the invention described in claim 3, since the suction box is divided into a lower chamber with an inlet opening and an upper chamber with an outlet opening, the communication hole that communicates the lower chamber and the upper chamber with each other is provided at the inlet of the suction box. The position of the lower end of the opening is low, so that the pressure of the air intake system can be prevented from changing rapidly when the opening of the vehicle body cover encounters a strong cross wind.

According to the invention described in claim 4, since the lower part of the lower chamber is provided with an opening for pressure relief, when the opening of the vehicle body cover is subjected to cross wind, the pressure in the lower chamber can be released through the opening for pressure relief, thereby A sharp change in pressure in the suction system is more effectively prevented.

According to the invention described in claim 5, since the auxiliary pedal for the rear seat rider protrudes toward the outside of the vehicle body cover through the opening of the vehicle body cover, it is not necessary to form a special opening for the auxiliary pedal, thereby improving the vehicle performance. The strength of the body cover improves the appearance.

Fig. 1 is an overall side view of the scooter.

FIG. 2 is a partially enlarged view of FIG. 1 .

Fig. 3 is a view showing a state in which the side cover in Fig. 2 is removed.

Fig. 4 is a view from the direction indicated by arrow 4 in Fig. 3 .

Fig. 5 is an enlarged sectional view of section 5-5 in Fig. 2 .

Fig. 6 is an enlarged sectional view of section 6-6 in Fig. 2 .

The implementation of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.

Fig. 1 to Fig. 6 have shown an embodiment of the present invention, and Fig. 1 is the overall side view of small motorcycle, Fig. 2 is the partial enlarged view of Fig. 1, Fig. 3 is the state after the side cover in representing Fig. 2 is disassembled Fig. 4 is a view in the direction indicated by arrow 4 in Fig. 3, Fig. 5 is an enlarged sectional view of section 5-5 in Fig. 2, and Fig. 6 is an enlarged sectional view of section 6-6 in Fig. 2 .

As shown in Figure 1, the vehicle frame F made of welded steel pipes that constitutes the V frame of a small motorcycle includes: a front tube 1 connected to the front tube 1 through gussets 2 and 2 and extending toward the rear of the vehicle body. The tube 3 is separated left and right from the vicinity of the lower end of the down tube 3 and extends toward the rear and upper part of the vehicle body, and the rear ends are connected into one left and right main frame 4, 4 by U-shaped bending. The front parts of the left and right main frames 4 are connected to the lower ends of the down tubes 3 through a pair of reinforcing pipes 5, 5, and the middle parts and rear parts of the left and right main frames 4, 4 in the front-rear direction are respectively formed by the first vehicle frame extending toward the left-right direction of the vehicle body. The beam 6 and the second frame beam 7 are connected.

The vehicle body B made of synthetic resin supported on the vehicle frame F includes: a leg guard front part 8 covering the front of the head pipe 1; The leg guard rear part 9, the pedal 10 connected to the lower end of the leg guard rear part 9, the lower cover 11 connected to the lower end of the leg guard front part 8 for covering the lower side of the pedal 10, the rear cover of the vehicle body The rear cover 12 and the left and right side covers 13 , 13 connected to the rear ends of the pedal 10 and the lower cover 11 from the left and right front parts of the rear cover 12 .

A front wheel Wf is pivotally supported at the lower end of a front fork 14 rotatably supported on the head pipe 1 , and an upper portion of the front wheel Wf is covered by a front fender 15 . The handlebar post 17 protrudes above the upper cover 16 for covering the upper end openings of the leg guard front part 8 and the leg guard rear part 9, and the center part of the handlebar 18 in the left-right direction is connected to the top of the handlebar post 17. . A headlight 19 and a speedometer 20 are supported on the handlebar post 17 , and a handlebar locking device 21 integrated with an ignition switch is supported on the right side of the head pipe 1 .

The front end of the power unit P pivotally supporting the rear wheel Wr is supported vertically on the first cross member 6 , and the power unit P is connected to the second cross member 7 by a rear shock absorber 22 . On the upper surface of the rear cover 12, a seat 23 for a rider is provided.

As shown in FIG. 2 , recessed portions 13 ₁ , 13 1 are formed on the left and right side covers 13 , ₁₃ to be recessed inwardly of the vehicle body. Openings 13 ₂ , 13 ₂ are formed at the center of the recesses 13 ₁ , 13 ₁ , and the rear seat rider's auxiliary pedals 31 , 31 protrude from the openings 13 ₂ , 13 ₂ to the outside of the vehicle body. The auxiliary pedals 31, 31 are supported on the vehicle body to be described later. In other words, power unit support brackets 32, 32 are respectively welded on the left and right main frames 4, 4, and left and right pedal struts 33, 33 are respectively fixed with several bolts 34 on the power unit support brackets 32, 32. The left and right ends of the pedal rod 35 arranged in the left and right directions of the vehicle body are welded to the pedal struts 33 , 33 to reinforce the pedal struts 33 , 33 . Then, the aforementioned auxiliary pedals 31, 31 are fixed to the left and right ends of the left and right pedal struts 33, 33 and the pedal rod 35. As shown in FIG.

The structure of the air intake system of the power plant P will be described below with reference to FIGS. 3 to 6 .

On the upper surface of the transmission case 30 of the power unit P, an air cleaner 37 is supported by bolts 36 . The rear end of the air intake duct 38 extending in the front-rear direction of the vehicle body is connected to the inlet portion ₃₇₁ of the air cleaner 37, and the front end of the air intake duct 38 is connected to the sleeve pipe 39 made of rubber in a bellows shape. The suction box 40 fixed on the inside of the side cover 13 on the left side of the vehicle body is connected. An outlet portion ₃₇₂ of the air cleaner 37 is connected to the crankcase of the engine E through a carburetor 41 and an intake pipe 42 .

The suction box 40 made of synthetic resin is divided into an upper half body 51 and a lower half body 52. In a state where the outer periphery of the upper half body 51 is fitted to the inner periphery of the lower half body 52, the upper half body 51 is The formed several protrusions 51 ₃ cooperate with the several matching holes 52 ₃ formed on the lower half body 52 to combine the upper half body 51 and the lower half body 52 into one body. Mounting brackets 51 ₄ , 51 ₄ are protrudingly provided at the front and rear of the upper half body 51 respectively, and the small screws 43 , 43 passing through these mounting brackets 51 ₄ , 51 ₄ are screwed into the side cover 13 respectively. The suction box 40 is fixed inside the side cover 13 in the protruding bosses 13 ₃ , 13 ₃ inside. Although Fig. 5 only shows the position fixed by means of the rear mounting bracket ₅₁₄ , the fixing position of the front mounting bracket ₅₁₄ is the same as this structure.

The upper half body 51 is provided with an outlet opening 51 ₁ opening to the rear at its upper portion, and a communication hole 51 ₂ opening downward at its lower portion, and the lower half body 52 has an inlet opening portion opening to the left at its side portion. 52 ₁ and an opening 52 ₂ for pressure release opened downward at the lower part thereof. It can be clearly seen from FIG. 6 that the height of the communication hole 51 ₂ is set at a position lower than the height of the lower end of the inlet opening 52 ₁ by a distance α. In addition, the area of the pressure release opening 52 ₂ is smaller than the area of the inlet opening 52 ₁ and the area of the communication hole 51 ₂ .

When the suction box 40 is installed on the side cover 13, since it cannot be fixed on the opening, the inlet opening ₅₂₁ is arranged facing the rear portion of the opening ₁₃₂ of the side cover 13. In addition, the sleeve pipe The front end of 39 is fitted on the upper half body 51 and is fixed with hoop 44. As can be clearly seen from Fig. 2, not only the opening ₁₃₂ of the side cover 13 is used to carry out suction introduction, but also the opening ₁₃₂ of the side cover 13 can be used to make the auxiliary pedal 31 stretch out to the outside of the side cover 13, thus , the number of openings ₁₃₂ is suppressed to a minimum, the strength of the side cover 13 is ensured, and the influence on the appearance is avoided.

Suction conduit 38 is made integral by synthetic resin, and its rear end is fixed by being pressed in the inlet portion ₃₇₁ of air cleaner 37, and the cylindrical part ₃₈₁ that its front end is provided with is pressed into the rear end of sleeve pipe 39, free embedded in the casing 39. In addition, the suspension device 47 that is fixed on _{the aforementioned air intake pipe 42 with two bolts 46, 46 has a reed 47 1 extending} laterally along the vehicle body. The middle portion in the front-back direction of the suction duct 38 is suspended and supported. A resonator 48 for reducing intake noise is provided on the upper portion of the intake duct 38, and an annular flange portion ₃₈₃ for shielding muddy water bounced by the rear wheel Wr is formed on the entire cylindrical portion 381.

The outlet portion 37 ₁ of the air filter 37 and the carburetor 41 are fitted into each other and fixedly connected together with a hoop 45 . In addition, the carburetor 41 and the suction pipe 42 are fixedly connected together by means of the aforementioned two bolts 46 , 46 that fix the suspension device 47 on the suction pipe 42 . And the intake pipe 42 is fixed on the engine E with four bolts 49 .

The action of the embodiment of the present invention having the above structure is described below.

The suction gas in the lower chamber 54 is sucked from the inlet opening ₅₂₁ of the suction box 40 facing the opening 132 of the side cover ₁₃ , and flows into the upper chamber 53 from the communication hole ₅₁₂ along the direction shown by the arrow a in FIG. In this way, the air filter 37 is supplied through the outlet opening ₅₁₁ and the air intake duct 38, and the intake air purified by the air filter 37 passes through the carburetor 41 to be mixed with fuel, and then is supplied through the air intake pipe 42. engine E.

At this time, since the opening 132 of the side cover 13 facing the suction box 40 is located in such a way that its front is covered by the leg guard front part 8 and the leg guard rear part 9, and its lower part is covered by the pedal 10. , the amount of dust and muddy water sucked into the suction box 40 and splashed by the front wheels Wf and the rear wheels Wr can be minimized. In addition, the air flow path between the inlet opening ₅₂₁ and the outlet opening ₅₁₁ has a labyrinth shape, and since the inlet opening ₅₂₁ is provided at a position lower than the outlet opening ₅₁₁ , it is included in the intake air. The dust and the like fall to the bottom of the suction box 40 due to gravity, so that only the purified intake air can be supplied to the engine E.

In addition, when the strong cross wind hitting the side cover 13 is blown into the lower cavity 54 of the suction box ₄₀ from the inlet opening 521, since the height of the communication hole ₅₁₂ is set at a position lower than the height of the lower end of the inlet opening ₅₂₁ , Therefore, it is possible to prevent the rapid change of the internal pressure of the upper chamber 53 and the air intake conduit 38 communicating with the upper chamber 53, and ensure the stable operation of the engine E. At this time, the air flowing into the lower chamber 54 is discharged from the pressure relief opening ₅₂₂ to the outside of the suction box 40 in the direction indicated by the arrow c in FIG.

Furthermore, under normal conditions where the inlet opening ₅₂₁ is not affected by strong cross winds, most of the air is sucked into the lower cavity 54 from the inlet opening ₅₂₁ along the direction shown by arrow a, and is sucked from the pressure relief opening along the direction shown by arrow b. The air sucked by the part ₅₂₂ is very little, and like this, dust and the like rolled up in the rear cover 12 and the side cover 13 by the rear Wr will not be sucked through the opening part ₅₂₂ for pressure release. The reason is that the area of the pressure relief opening ₅₂₂ is smaller than the area of the inlet opening ₅₂₁ , and the distance between the inlet opening ₅₂₁ and the communication hole ₅₁₂ is smaller than the distance between the pressure relief opening ₅₂₂ and the communication hole ₅₁₂ . In this way, the flow resistance of the air sucked in from the inlet opening ₅₂₁ is smaller than the flow resistance of the air sucked in from the pressure relief opening ₅₂₂ .

In addition, since the total length of the air intake duct 38 connecting the air intake box 40 to the air cleaner 37 is very short, and has no sharp bends, and is arranged approximately linearly along the front and rear directions of the vehicle body, therefore, The suction resistance in the suction duct 38 can be suppressed to the minimum, and the output power of the engine E is increased. Furthermore, since the inhaled air is the air outside the vehicle body B whose temperature rises without being affected by the heat of the engine E, the intake air temperature is lowered, and the output power of the engine E is further improved.

When the power unit P pivotally supported on the vehicle body swings up and down as the motorcycle V walks, the relative movement of the suction duct 38 that swings up and down with the power unit P and the suction box 40 fixed on the side of the vehicle body is caused by The elastic deformation of the sleeve 39 interconnecting the suction duct 38 and the suction box 40 is absorbed.

Although the embodiments of the present invention have been described in detail above, various design changes can be made without departing from the gist of the present invention.

For example, in the above-mentioned embodiment, the suction box 40 and the side cover 13 are formed as separate components, however, both may be formed as a single component. Also, in the above embodiment, the opening ₁₃₂ is formed in the side cover 13, however, the opening may be formed in any other vehicle body cover.

Claims (5)

1, a kind of suction structure of aspirated air of motor scooter, but in the easy on and off pivot top of propping up the transmission gearbox (30) of the engine installation (P) in rear vehicle swingingly, be supported with airfilter (37), this airfilter (37) is drawn air by intake guide (38), it is characterized in that

On the car body lid (13) of the side body of vehicle seat (23) below that is used to cover pedal (10) rear, be formed with opening (13 ₂), in the inside of aforementioned car body lid (13), in the face of aforementioned opening (13 ₂) being provided with gettering container (40), aforementioned intake guide (38) links to each other with this gettering container (40).

2, the suction structure of the aspirated air of motor scooter according to claim 1 is characterized in that, aforementioned gettering container (40) has the inlet peristome (52 that is arranged on its sidepiece ₁) and the exit opening portion (51 of portion disposed thereon ₁), inlet peristome (52 ₁) in the face of the opening (13 of car body lid (13) ₂), simultaneously, exit opening portion (51 ₁) link to each other with intake guide (38).

3, the suction structure of the aspirated air of motor scooter according to claim 2 is characterized in that, aforementioned gettering container (40) is divided into has aforementioned inlet peristome (52 ₁) cavity of resorption (54) and have aforementioned exit opening portion (51 ₁) epicoele (53), the intercommunicating pore (51 that this cavity of resorption (54) and epicoele (53) are interconnected ₂) be arranged on inlet peristome (52 than aforementioned gettering container (40) ₁) low position, lower end.

4, the suction structure of the aspirated air of motor scooter according to claim 3 is characterized in that, the bottom of aforementioned cavity of resorption (54) is provided with pressure release peristome (52 ₂).

5, the suction structure of the aspirated air of motor scooter according to claim 1 is characterized in that, the accessory pedal that the back seat rider uses (31) is by the opening (13 of aforementioned car body lid (13) ₂) stretch out towards the outside of car body lid (13).

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