JP2668783B2 - Motorcycle - Google Patents

Description

The present invention relates to a motorcycle provided with a cowling for covering an engine. [Prior Art] A cowling reduces air resistance that increases during high-speed running of a motorcycle. For example, as a motorcycle equipped with this type of cowling, Japanese Patent Laid-Open No. 60-6923 is available.
There is one disclosed in Japanese Patent Publication No. 0. This covers the outside of a radiator and a V-type engine disposed behind the radiator and having a carburetor between cylinders with a cowling,
The radiator and the engine are cooled by introducing traveling wind from an air intake opening in front of the radiator. [Problems to be Solved by the Invention] However, such a structure has a problem that the engine output is not always improved. That is,
This is because the air warmed by the radiator is sucked in from the carburetor, and the amount of intake air becomes relatively smaller than in the case where low temperature air is sucked in. In order to solve this problem, it is conceivable to project the carburetor out of the cowling, or to provide an intake chamber communicating with the outside on the side wall of the cowling. Adjustment of the air-fuel ratio becomes difficult because the pressure in the vicinity changes. Also,
In the latter case, since the cowling expands in the vehicle width direction by the amount of the intake chamber provided, air resistance increases. Note that in order to guide the traveling wind to the vaporizer, it is necessary to prevent muddy water, dust, mist-like water, and the like that have been wound by the front wheels from being sucked into the vaporizer. [Means for Solving the Problems] The present invention has been made in view of such circumstances, and it is difficult to adjust the air-fuel ratio or the air resistance does not increase, and moreover, muddy water, dust or mist is generated. An object of the present invention is to provide a motorcycle in which engine output is improved while preventing water or the like from being sucked into a vaporizer. The motorcycle according to the present invention includes a vertical wall having an opening through which an intake passage extending from the carburetor passes between a carburetor connected to the front side of the engine and the cylinder of the engine, and a vertical wall of the vehicle body extending from the upper end of the vertical wall. A partition wall having an opening extending forward and above the carburetor and having an opening through which an operation wire and a fuel supply pipe of the carburetor are inserted is provided, and the partition wall serves as a rear wall of the vehicle body. An air intake chamber in which the carburetor is accommodated and an air intake port of the carburetor is opened, is formed inward of the cowling, and the intake chamber is opened at the front edge of the cowling toward the front of the vehicle body. A horizontal air passage extending rearward of the vehicle body from the air passage, and configured so that traveling wind is guided from an intake duct having a vertical air passage extending downward from the rear side of the air passage, the air intake, Upper end than lower end Positioned in front of the body, in which the front edge of the air intake port is formed to be inclined obliquely downward to the rear at the side view. [Operation] In the present invention, the traveling wind flows into the cowling from the duct, is accumulated in the intake chamber, and is sucked into the carburetor. Further, the radiant heat from the cylinder is blocked by the partition wall extending above the carburetor, so that the air inside the carburetor and the intake chamber is not heated. Furthermore, traveling wind can be introduced from a position above the intake chamber. In addition, since the air intake duct has a structure in which the direction of air flow is bent downward at a right angle in the middle, rainwater and water droplets rolled up by the front wheels are drawn into the air intake together with the traveling wind during rainy weather etc. Even if so, these waters are separated from the air by hitting the vertical wall forming the bent portion in the intake duct, and flow down there. In addition, since the upper wall of the horizontal air passage in the intake duct is longer than the bottom wall of the passage, the resistance when the traveling wind flows along the upper wall is large, and the traveling flowing along the upper wall is large. The wind hits the vertical wall of the intake passage in the vertical direction with the flow velocity reduced. For this reason, even if the atomized water flows into the air intake together with the traveling wind, the water can be reliably captured in the intake duct. Further, since the bottom wall is relatively short, the resistance when the traveling wind flows along the bottom wall is small, and the traveling wind can be efficiently guided to the intake chamber. Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a side view showing a motorcycle according to the present invention, FIG. 2 is a plan view showing a part of the motorcycle, and FIG.
FIG. 4 is a front view showing the cowling, and a reference numeral 1 in FIG. 1 shows a motorcycle frame. This frame 1 has a head pipe 2 and
Left and right aluminum alloy main frames 5 connected to the head pipe 2 and supporting the fuel tank 3 and the water-cooled engine 4, and seats 6 connected to the rear of the main frame 5.
, And a back stay 8 for supporting a rear portion of the seat rail 7.
The main frame 5 includes a tank rail 5a, a heat pillar 5b,
The back stay 8 includes a down tube 5c, and the back stay 8 projects upward from the center of a cross member 9 that connects the left and right seat pillars 5b at a position separated from the lower surface of the seat 6 downward. On the head pipe 2, a front fork 12 for suspending the front wheel 11 and a handle 13 for operating the front fork 12 are rotatably supported. A radiator 14 is disposed between the front fork 12 and the engine 4 and is supported on the upper front side of the down tube 5c via a bracket. The engine 4 is a crank chamber scavenging two-cycle parallel two-cylinder engine in the present embodiment, and is a front and rear divided crankcase supported between left and right main frames 5.
4a and two cylinders extended from this crankcase 4a
4b. Then, by tilting the cylinder 4b forward so that most of the cylinder 4b faces below the radiator 14,
The height of the engine 4 is kept low, and a ventilation passage 15 extending rearward from the back of the radiator is formed between the engine 4 and the fuel tank 3 and the seat 6. Reference numeral 16 denotes a carburetor connected to the front side of the crankcase 4a, and reference numeral 17 denotes an exhaust pipe connected to the rear surface of the cylinder 4b at an acute angle to the axis of the cylinder 4b and extending rearward. The exhaust pipe 17 is formed symmetrically with respect to the center line in the longitudinal direction of the vehicle body,
The buckstays 8 are symmetrically disposed on both sides of the backstay 8 so as to extend substantially linearly rearward in the ventilation path 15. In other words, the exhaust pipe 17 extends in a direction whose axis is substantially coincident with the direction of exhaust from the cylinder 4b. In addition, a chamber portion 17a having a larger sectional area than other portions is provided at a portion of the exhaust pipe 17 corresponding to both sides of the back stay 8. Reference numeral 18 denotes a rear arm made of an aluminum alloy pivotally attached to the seat pillar 5b, 19 denotes a rear wheel supported by the rear arm 18, and 20 denotes a cushion unit interposed between the rear arm 18 and the cross member 9. is there. 21 is a synthetic resin cowling that reduces air resistance and protects the driver from wind pressure. The cowling 21 is divided into an upper cowling 21a that covers around the handle 13 and a side of the radiator 14, and a lower cowling 21b that covers the front and both sides of the engine 4 and a lower part thereof. Supported by the frame 1. A central air intake 22 for taking in the traveling wind is opened at a position corresponding to the front of the radiator 14 of the upper cowling 21a. The lower portion of the lower cowling 21b projects forward along the outer peripheral surface of the front wheel 11. And in this corner,
An intake chamber 24 is formed by a partition plate 23 that is disposed between the cylinder 4b and the front wall of the lower cowling 21b and that defines the front and rear portions of the lower cowling 21b while maintaining air permeability. Are arranged so as to face the inside of the intake chamber 24. The partition plate 23 constitutes a partition wall according to the present invention, and a space between the carburetor 16 and the engine 4 is defined by the partition plate 23, and radiant heat generated from the engine 4 is blocked. Further, inside the both side walls of the lower cowling 21b, traveling wind is supplied from the side air intakes 25 provided on the both side walls to the intake chamber 24.
An air intake duct 26 to be introduced into is integrally provided. This intake duct 26, as shown in FIGS. 1 and 4,
At the front edge of the lower cowling 21b, a horizontal air passage extending rearward from the vehicle body from the side air intake port 25 that opens toward the front of the vehicle body, and a vertical passage extending downward from the rear end of the air passage. Has been formed. As shown in FIG. 1, the side air intake 25 is formed such that the upper end is located forward of the vehicle body from the lower end, and the front edge of the side air intake 25 is inclined backward and downward in a side view. Has been done. Therefore, the upper wall forming the horizontal air passage is longer than the bottom wall of the air passage. Further, the air outlet 27 of the intake duct 26 has a filter opened downward in the intake chamber 24. As shown in FIGS. 5 and 6, the partition plate 23 is made of a resin plate having an outer shape smaller than the cross-sectional shape of the lower cowling 21b, and is bent in a bent shape in a bent curve 31 when viewed from the side. The opening indicated by the reference numeral 32 formed in the vertical wall portion below the folding line 31 is a mounting hole into which the joint 33 connecting the carburetor 16 is inserted. The upper wall portion above the folding curve 31 extends from the upper end of the vertical wall portion to the front of the vehicle body and above the carburetor 16, through which an operation wire of the carburetor 16 and a fuel supply pipe are inserted. The insertion hole 34 is opened. 35 are slits cut between the insertion holes 34 and the mounting holes 32 and the upper end surface of the partition plate 23. That is, the partition plate 23 pushes the slits 35.
Attach to 33 and pipes are inserted. Reference numeral 36 denotes a synthetic resin body cover that covers the lower part and the rear part of the seat 6. In the motorcycle configured as described above, when the motorcycle travels, the traveling wind flows into the cowling 21 from the center air intake 22 and the side air intake 25 of the cowling 21. The traveling wind flowing from the central air intake 22 passes through the radiator 14 and flows rearward. Side air intake 25
The traveling wind flowing from the intake chamber 24 is accumulated in the intake chamber 24, and is sucked into the carburetor 16 from the intake chamber 24. At this time,
Radiation heat from the cylinder 4b is cut off by the partition plate 23 extending above the carburetor 16, and the air inside the carburetor 16 and the intake chamber is not heated, so the intake air passes through the intake duct 26 from the front edge of the cowling 21. The traveling wind flowing into the chamber 24 is
When it is stored in the and is sucked into the carburetor 16, it is not heated. Therefore, fresh running wind having a low temperature can be introduced into the engine 4 to increase the amount of intake air, and the engine output can be relatively improved. In addition, since the intake port of the carburetor 16 is open to the intake chamber 24 inside the cowling 21 and the traveling wind does not directly hit the carburetor 16, the adjustment of the air-fuel ratio does not become difficult, Moreover, since the outer shape of the cowling 21 does not need to be changed at all, air resistance does not increase.
In addition, since the side air intake 25 is opened at the front edge of the cowling 21, traveling wind directly flows into the side air intake 25. Therefore, the traveling wind can be guided to the intake chamber 24 in the highest pressure state, and the pressure in the intake chamber 24 can be kept high in the static pressure state. Furthermore, traveling wind can be introduced from a position above the intake chamber 24, and foreign matter such as muddy water and dust rolled up by the front wheels 11 can be compared with the case where the air intake is opened at the same height as the intake chamber 24. Is hard to penetrate. In addition, the intake duct 26 has a structure in which the direction of air flow is bent downward at a substantially right angle in the middle, so that when running in rainy weather, etc. Even if the water is sucked into the inlet 25, these waters are separated from the air by hitting the vertical wall forming the bent portion in the intake duct 26, and flow down through the vaporizer.
It is hard to be sucked into 16. Furthermore, since the upper wall of the air passage in the intake duct 26 in the horizontal direction is longer than the bottom wall of this passage, the resistance when the traveling wind flows along the upper wall is large, and the air flows along the upper wall. The traveling wind hits the vertical wall of the intake passage in the vertical direction with the flow velocity reduced. Therefore, even if mist-like water flows into the side air intake 25 together with the traveling wind, this water can be reliably captured in the intake duct 26. Further, since the bottom wall is relatively short, the resistance when traveling wind flows along the bottom wall is small,
The traveling wind can be efficiently guided to the intake chamber 24. Therefore, it is possible to remove the moisture contained in the traveling wind while minimizing the pressure loss of the traveling wind. Note that the engine 4 is not limited to a parallel two-cylinder engine, and may be implemented, for example, in a single-cylinder engine. Further, the shape of the intake duct 26 can be appropriately changed, for example, as shown in FIGS. 7 and 8 showing a front view and a vertical sectional view of the intake duct. In the intake duct 26 shown in these figures, the rear wall bent in a substantially right-angled direction has slits for discharging rainwater flowing along the rear wall entering from the side air intake 25 to the rear of the partition plate 23. 41 is opened diagonally downward, and pebbles etc. are sucked into the air outlet 27
A mesh member 42 is provided to prevent passage through 26.
Therefore, according to such an intake duct 26, it is possible to prevent mixed foreign substances in the air from entering the vicinity of the vaporizer 16 and being sucked into the vaporizer 16. [Advantages of the Invention] As described above, in the motorcycle according to the present invention, the longitudinal direction in which the attachment hole through which the intake passage extending from the carburetor penetrates is formed between the carburetor connected to the front side of the engine and the cylinder of the engine. A partition wall having a wall and an upper wall extending from the upper end of the vertical wall to the front of the vehicle body and above the carburetor and having an insertion hole for inserting the operation wire of the carburetor and the fuel supply pipe is provided. , The partition plate serves as a wall on the rear side of the vehicle body, the carburetor is accommodated, and an intake chamber in which an intake port of the carburetor is opened is formed inside the cowling, and the intake chamber is formed at the front edge of the cowling. Since the running wind is guided from the intake duct that has an air intake opening toward the front of the vehicle body, fresh running wind with a low temperature can be introduced into the engine to increase the intake air amount. Relative to Can be improved. That is, the radiant heat from the cylinder is cut off by the partition wall extending above the carburetor, and the air inside the carburetor and the intake chamber is not heated. This is because the traveling wind is not heated when it is accumulated in the intake chamber and is sucked into the carburetor. Moreover, since the intake port of the carburetor is opened in the intake chamber inside the cowling, the traveling wind does not hit the carburetor directly, so there is no difficulty in adjusting the air-fuel ratio, and moreover, Since the outer shape of the cowling does not need to be changed, air resistance does not increase. in addition,
Since the air intake is open at the front edge of the cowling, the traveling wind directly flows into the air intake. Therefore, the traveling wind can be guided to the intake chamber at the highest pressure, and the pressure in the intake chamber can be kept high at a static pressure. Further, since the intake duct has a structure having a horizontal air passage extending from the air intake port to the rear of the vehicle body and a vertical air passage extending downward from the rear end of the air passage, the intake duct is positioned above the intake chamber. It is possible to introduce traveling air from, and compared to the case where the air intake is opened at the same height as the intake chamber, foreign matter such as muddy water and dust wound up by the front wheels is less likely to enter. In addition, the intake duct has a structure in which the direction of air flow is bent downward at a right angle on the way,
Even if rainwater or water splashes from the front wheels are drawn into the air intake along with the running wind when driving in rainy weather, these moisture will not reach the vertical wall that forms the bent part in the intake duct and Since it is separated from and flows down through here, it is difficult to be sucked into the vaporizer. Further, since the upper end of the air intake is positioned in front of the lower end of the vehicle body and the front edge of the air intake is inclined obliquely downward and rearward when viewed from the side, the air duct in the horizontal direction of the intake duct is Since the upper wall is longer than the bottom wall of the passage, the resistance when the traveling wind flows along the upper wall is large, and the traveling wind flowing along the upper wall has a lower intake speed in a vertical direction. It comes into contact with the vertical wall of the passage. For this reason, even if the atomized water flows into the air intake together with the traveling wind, the water can be reliably captured in the intake duct. Further, since the bottom wall is relatively short, the resistance when the traveling wind flows along the bottom wall is small, and the traveling wind can be efficiently guided to the intake chamber. Therefore, if the pressure loss of the traveling wind is made as small as possible, the water contained in the traveling wind can be removed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a motorcycle according to the present invention, FIG. 2 is a plan view showing a part of the motorcycle, and FIG.
FIG. 4 is a front view showing a cowling, FIG. 5 is a development view showing a partition plate, FIG. 6 is a side view of the same, FIG. 7 and FIG. It is the front view and longitudinal sectional view which show an example. 4 ... Engine, 4a ... Cylinder, 16 ... Vaporizer, 21b ...
Lower cowling, 23 …… partition plate, 24 …… intake chamber, 25 ……
Side air intake, 26 …… Intake duct, 32 …… Mounting hole, 34
...... Insertion hole.

Claims (1)

(57) [Claims] A motorcycle provided with a cowling that covers the front, both sides and below the engine, a vertical wall having an opening formed between a carburetor connected to a front side of the engine and a cylinder of the engine, through which an intake passage extending from the carburetor passes. A partition wall having an opening extending from the upper end of the vertical wall to the front of the vehicle body and above the carburetor to form an opening through which an operation wire and a fuel supply pipe of the carburetor are inserted; and The partition wall serves as a wall on the rear side of the vehicle body, and the carburetor is housed therein, and an intake chamber in which the carburetor intake port is opened is formed inside the cowling, and the intake chamber is formed at the front edge of the cowling. Traveling wind from an intake duct having a horizontal air passage extending rearward from the vehicle body from an air intake opening toward the front of the vehicle, and a vertical air passage extending downward from the rear side of the air passage. The air intake is configured to be guided, and the air intake is formed so that the upper end is positioned in front of the vehicle body with respect to the lower end, and the front edge of the air intake is inclined rearward and downward in a side view. Motorcycle to do.