JPH01237275A - Intake device for motorcycle - Google Patents

Abstract

PURPOSE:To improve intake efficiency by placing an air cleaner in the rear of a main pipe connected to a head pipe, providing an air introducing plate having an opening in the front on the outer periphery of the main pipe, and utilizing the main pipe, the upper portion of a down tube, and a tension pipe also as air passages. CONSTITUTION:A main pipe 6 is connected to a head pipe 2, the top end of a down tube 7 is connected to the vicinity of the connecting portion, the down tube 7 is connected to the main pipe 6 with a tension pipe 8, and an air cleaner 23 is place in the rear of the main pipe 6. An air introducing plate 37 having an opening in the front is provided on the outer periphery of the main pipe 6 to guide and feed air into the air cleaner, while the main pipe 6, down tube 7, and tension pipe 8 are also utilized as air passages to increase a feeding air quantity into the air cleaner as a whole, thereby improving intake efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an intake device for a motorcycle, and particularly to an intake device for a motorcycle that improves intake efficiency.

[Prior Art] Generally, in a motorcycle, an engine is mounted on the vehicle body, and an air cleaner connected to a carburetor connected to the engine is housed in a space behind the engine.

This air cleaner is installed in a narrow space behind the engine, and the air cleaner is located between the engine and fuel tank.
It is covered with a sheet, etc., and these are obstacles to introducing air. For this reason, for example,
As disclosed in Japanese Patent No. 9-148303, air is sucked in from the opening formed at the connection between the main pipe and the air cleaner or from the opening at the bottom of the downchave, and this air is passed from the main pipe through the head pipe. There is something to be introduced into the air cleaner.

[Problems to be Solved by the Invention] By the way, when air is sucked into the air cleaner from the down tube or the connection part with the air cleaner, since these parts are located in the middle of the vehicle body and close to the ground, Soil is undesirable because it means breathing in relatively dirty air that contains dirt and moisture.

Additionally, air cleaners have an element that purifies intake air, but especially in the case of racing motorcycles, it is necessary to increase the area of the element to reduce the intake resistance and to increase the total amount of intake air. However, there are problems such as insufficient air volume when drawing air from the main pipe.

This invention was made in view of the above circumstances, and provides an intake device for a motorcycle that simultaneously solves these problems with a project-free $it construction, enables good air intake, and improves the intake efficiency of the engine. It is intended to.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the intake system for a motorcycle of the present invention includes an air cleaner disposed behind a main pipe connected to a head vibrator, and an air cleaner installed along the main pipe. A TSL intake passage is formed by the air introduction plate and the fuel tank arranged, and a second intake passage is further formed in the main pipe, and intake air is guided from the first intake passage and the second intake passage to the air cleaner. It is characterized by what it has done.

Further, in the intake device for a motorcycle of the present invention, the air introduction plate is formed of synthetic resin, the air introduction plate is supported so as to straddle the main pipe, and the upper part of the air introduction plate is covered with a fuel tank. A first intake passage can be formed by the first intake passage, and the suction portion of the first intake passage can be provided near the head vibe.

[Function] In this invention, the first intake passage formed by the air introduction plate and the fuel tank, and the second intake passage formed in the main pipe.
Air is introduced into the air cleaner from the intake passage. Therefore, an amount of air corresponding to the demand of the engine can be sucked in through the air cleaner. In addition, air is sucked in from a high position in the vehicle body near the head vibrator, making it possible to suck in good air that does not contain dust or moisture.

Furthermore, it is preferable to form the air introduction plate from a synthetic resin because it will be closely connected to the fuel tank and the first intake passage will be easier to form.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

Figure 1 is a side view of a motorcycle to which this invention is applied;
The figure is a cross-sectional view showing the inhalation device, and Figure 3 is III of Figure 2.
-I11 sectional view, and FIG. 4 is a sectional view taken along line IV-IV in FIG.

In the figure, reference numeral 1 denotes a vehicle body, and a front fork 3 is supported by a head vibrator 2 at the front, a handle 4 is provided at the upper end of the front fork 3, and a steering wheel 5 is provided at the lower end. A main pipe is connected to the head vibrator 2, and a down tube is connected to the connecting portion of the head vibe 2 and the main pipe. There is a tension vibe 8 between the down tube 7 and the main pipero.
4! The rear end of the tension vibe 8 is connected to the main pipe from the center to the rear end.

A rear arm bracket 27 is connected between the bifurcated rear end 7a of the down tube and the seat pillar 9 connected to the main piston, and a rear arm bracket 27 is connected to the connecting part between the main pipe and the seat peeler 9. A bracket 15 is welded.

A rear arm 12 on which a drive wheel 11 is suspended is swingably provided on the rear arm bracket 2f.
2 and the rear arm bracket 27 are connected by a link mechanism 13. A rear suspension 14 connected to this link 1 structure 13 includes a main pipe and a seat pillar 9.
Attach the bolt 1 to the bracket 15 that is fixed to the
It is rotatably supported via 6. Power from an engine 17 mounted on the vehicle body 1 is transmitted via a chain 18 to a WAII wheel 11 suspended from a rear arm 12.

An exhaust pipe 19 having an expansion chamber 19a extends from the front side of the cylinder of the engine 17 toward the rear of the vehicle body 1, and a silencer 21 is attached to the end located on the lower side of the seat 20. Also, a carburetor 2 is installed on the rear side of the cylinder of the engine 17.
2 is connected to the carburetor 22, and an air cleaner 23 is further connected to the carburetor 22, so that when the engine 1 is operated, the air taken in is cleaned and sent to the carburetor 22. The fuel and air mixed in the carburetor 22 are sucked into the engine 17.

The air cleaner 23 is arranged behind the engine 17 and supports the seat 20.

That is, an element 25 is built into the cleaner case 24 of the air cleaner 23, and air from the element 25 is guided from the cleaner joint 26 to the carburetor 22. A hollow upper bracket 2 is provided at the front upper part of the cleaner case 24.
8 is welded, and there is also a hollow bracket 29 at the lower front side.
is welded, and furthermore, a cross section ender 30 is welded to the rear side, thereby forming a box shape.

The cleaner case 24 is partitioned by an upper bracket 28 as shown in FIG. 4, and has an air inlet 32a.
, 32b, 32c are formed. The rear end of the main pipe is pushed into the upper bracket 28, and bolts 31 are inserted through the through holes 24a on both sides of the cleaner case 24 and are tightened and fixed to the main pipe. Further, the lower bracket 29 is attached to the rear arm bracket 9 as shown in FIG.

An opening 34 is formed in the upper part of the cleaner case 24 for taking out the element 25 when cleaning or replacing the element 25, and a drain hole 35 is formed in the lowermost part.

A water drain hole 36 is formed at the lowest part of the hollow part of the lower bracket 29 in a direction different from the water drain hole 35 of the cleaner case 24, and drains water entering the air cleaner 23 to the outside, and drains water from the outside. prevents intrusion.

An air introduction plate 37 made of, for example, synthetic resin is disposed across the entire main pipe of the vehicle body 1 from the front end to the rear end at a bent part 37a formed in the center of the plate, and this air The upper part of the introduction plate 37 is open. The front end 37 of this air introduction plate 37
As shown in FIG.
．． 39, and the rear end portion 37c is inserted and attached to the lower part of the air introduction ports 32a, 32b, and 32c of the cleaner case 24.

Further, a fuel tank 40 is attached to cover the open upper both sides 37d of the air introduction plate 37 from the outside, and the air introduction plate 37 and the fuel tank 40
Between? An R+ intake passage 41 is formed. By forming this air introduction plate 37 from synthetic resin,
The upper side portions 37d are fitted in the recess 40a of the fuel tank 40 so as to be pressed inward, and the two are tightly joined.

The front end of the air introduction plate 37 is open as shown by the two-dot chain line in FIG.
1 suction part is formed.

A portion of this sucked air is introduced from the first intake passage 41 formed between the air introduction plate 37 and the fuel tank 40 to the air introduction ports 32b and 32c of the cleaner case 24.

Also, as shown in FIG. 2, a part of the inhaled air enters the down tube 7 through the communication holes 38a and 39a of the communication pipes 38 and 39, and from the down tube 7, the communication hole 6a formed in the main pipe. from the down tube 7 to the second intake passage 42 formed in the main pipro, from the down tube 7 to the head vibrator 2 through the communication hole 2a formed in the head vibrator 2, and from the communication hole 2b to the 'fS2 intake passage of the main pipro. 42, the air passes through the tension vibe 8 through a communication hole 7a formed in the down tube 7, and is led to the second intake passage 42 of the main pipe through a communication hole 6b formed in the main pipe. In this way, the intake air collected in the main pipe is guided from the rear end of the main pipe to the air inlet 32a of the leaner case 24.

In this way, the opening 41a of the first intake passage 41 is formed by the air introduction plate 37 near the head vibrator 2.
Since it is located at the highest part of the vehicle body 1 and far from the ground, it is possible to inhale relatively good air that does not contain dust or moisture. In addition, by forming the opening 41a of the first intake passage 41 using the air introduction plate 37 supported by the main pipe, it can be used in a limited space around the handle, approximately equal to the length of the head vibe 2 in the radial direction. can ensure a long length,
The opening area is large.

The intake air taken in through the opening of the air introduction plate 37 is then transferred between the air introduction plate 37 and the fuel tank 4.
Since the air is guided to the air cleaner 23 from the first intake passage 41 formed between the main pipe and the air cleaner 23, the amount of air is guided to the air cleaner 23 from the second intake passage 42 formed in the main pipe. air can be inhaled.

Furthermore, since the ventilation area of the element 25 is large, when air passes through the element 25 and is cleaned, ventilation resistance is reduced and engine output does not drop.

In the above embodiment, the first airway 4 is formed by the air introduction plate 37 and the fuel tank 40. Although the main pipe and the second intake passage 42 formed in the main pipe are in communication with each other, the two do not need to communicate with each other. In this case, for example, an opening for introducing air into the main pipe may be provided in the head vibe. You can also do it.

[Effects of the Invention] As described above, in this invention, air is introduced into the air cleaner through the first intake passage formed by the air introduction plate and the fuel tank and the second intake passage formed in the main pipe. With a simple structure that uses a pipe, it is possible to easily expand the intake passage, and the amount of air that meets the requirements of the engine can be sucked in via the air cleaner.In addition, air can be sucked in from near the head vibrator. This allows the soil to breathe in good air that does not contain dust or moisture.

Furthermore, in the present invention, it is preferable that the air introduction plate is made of synthetic resin, since the first intake passage can be bonded closely when forming the first intake passage in the fuel tank, making it easier to form the first intake passage.

[Brief explanation of the drawing]

Figure 1 is a side view of a motorcycle to which this invention is applied;
The figure is a sectional view showing the inhaler, and Figure 3 is Figure 2 (F) I
II-II+ sectional view, Fig. 4 is Fig. 2-IV-IV
FIG. In the figure, reference numeral 2 denotes a head vibrator, 6 a main pipe, 7 a down tube, 8 a tension vibrator, 23 an air cleaner, 41 a first intake passage, and 42 a second intake passage. Figure 3 Figure 4

Claims (1)

[Claims] 1. An air cleaner is disposed behind a main pipe connected to the head pipe, and a first intake passage is formed by an air introduction plate and a fuel tank disposed along the main pipe, An intake system for a motorcycle, further comprising a second intake passage formed in the main pipe, and intake air is guided to an air cleaner from the first intake passage and the second intake passage. 2. The air introduction plate is formed of synthetic resin, the air introduction plate is supported so as to straddle the main pipe, and the upper part of the air introduction plate is covered with a fuel tank to form a first intake passage. 2. The intake system for a motorcycle according to claim 1, wherein the intake section of the first intake passage is provided near a head pipe.