JPH08230741A - Cowling device for motorcycle - Google Patents

Abstract

PURPOSE: To inexpensively improve air cooling effect by composing a cowling main body dividedly from injection moldings of of a synthetic resin material and forming a hot air exhaust port and an outside air intake port continuing to an expanded portion and a recessed portion of respectively a specific configuration on the outer wall surface of right and left side cowlings. CONSTITUTION: A cowling main body 5a is dividedly composed of an upper cowling 13, right and left side cowlings 14, 15 and a lower cowling 16, which are respectively formed from injection holdings of a synthetic resin material. The outer wall surface of right and left side cowlings 14, 15 are respectively formed with oblong expanded portions 20 projecting laterally in proportion as proceeding to the rear and also with an oblong recessed portions 21 sunken inward below the expanded portions 20. The rear end of the expanded portion 20 is provided with a lengthwise exhaust port 11, for exhausting hot air from a heat exchanger, opened rearward and the rear end of the recessed portion 21 is provided with a lengthwise intake port 12, for intaking outside air to the lower side of an engine, opened rearward. Thus air cooling effect is raised and manufacturing cost is lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle cowling device which enhances the air cooling effect around the crankcase of an engine and has a low production cost.

[0002]

2. Description of the Related Art Conventionally, a frame for supporting an engine or a seat is provided with a cowling which covers the lower side of the engine from the left and right sides of the engine from around the head pipe at the front end of the frame and from both sides of the engine. Are known. The front of the cowling is formed with an intake for traveling wind that opens in front of the engine, and a heat exchanger (radiator) for the engine is disposed inside the intake. The traveling wind taken from the above intake,
After passing through the radiator, it passes around the engine and blows backwards from the rear end of the cowling. In addition, since the temperature around the crankcase of the engine also becomes high, it is necessary to cool the air with the traveling wind flowing from the intake, so that the traveling wind flowing from the intake passes around the crankcase and passes around the radiator. Along with the flow of air, the cowling is blown backward from the rear end.

[0003]

However, the air flow passing around the crankcase collides with the front surface of the crankcase, and is forcibly divided into right and left there, and the surface of the crankcase is uneven. The airflow around the crankcase is disturbed. For this reason, the air resistance against the airflow flowing around the crankcase is large, the flow velocity of this airflow is reduced, and the amount of cooling air to the crankcase tends to be insufficient. Therefore, the air cooling efficiency with respect to the crankcase due to the airflow flowing through the cowling is poor, and the heat is gradually accumulated in the crankcase, so that the heat is accumulated in the lower space of the cowling,
This heat has a great effect on the driver. In order to increase the air volume around the crankcase, the width of the lower part of the cowling should be wide, but since the overhang of the lower part of the cowling in the left and right direction becomes large, the bank angle becomes smaller, and the lower part of the cowling is on the ground when turning. It is not desirable because it is easy to contact. Also, to increase the amount of air that blows around the crankcase of the engine as much as possible without increasing the lateral extension of the lower part of the cowling, widen the left and right width of the front of the cowling and open the air intake opening. One solution is to increase the area and devise the structure of the cowling so as to positively guide the traveling wind that has passed through the radiator toward the crankcase, but this is desirable because it increases the air resistance to the vehicle. Absent. Therefore, the present invention increases the amount of cooling air blown around the crankcase without increasing the overhang of the lower portion of the cowling and increasing the opening area of the intake of the cowling, and improves the air cooling efficiency around the crankcase. The problem is to devise the structure of the cowling so that it can be improved, and to devise the structure of the cowling so that it can be easily manufactured and can be produced at low cost.

[0004]

[Means for Solving the Problems] The measures taken to solve the above problems are as follows. The motorcycle is equipped with a main body, and the cowling main body is provided with an inlet for traveling wind that opens to the front of the engine, and the heat exchanger of the engine is arranged inside this inlet. ~ (D). (A) The cowling body includes an upper cowling that covers the periphery of the divided head pipe from the front, and a substantially flat plate-shaped left and right side cowling that covers the left and right sides of the engine continuously from the upper cowling. And (2) the upper cowling, the left and right side cowlings and the lower cowling are made of synthetic resin material by injection molding. (C) on the outer wall surface of the left and right side cowlings, a horizontally long bulging portion that projects to the side of the cowling body as it progresses rearward, and is located below the horizontally long bulging portion and As the advancing, formed a horizontally long concave portion which is depressed inside the cowling body,
(D) At the rear end of the laterally protruding portion of the side cowling, a vertically elongated portion is located at the rear of the heat exchanger for discharging hot air passing through the heat exchanger to the outside of the cowling body. The exhaust port is opened rearward, and a vertically long inlet port for introducing outside air between the cowling body and the lower side surface of the engine is opened rearward at the rear end of the horizontally long recess.

[0005]

[Operation] The operation of the above means is as follows. The traveling wind that has flowed in from the intake opening in front of the cowling body passes through the heat exchanger and becomes hot air, but the vertical exhaust port provided at the rear end of the lateral bulging portion of the side cowling is Through it, it blows diagonally outward and flows backward outside the side cowling. Therefore, a part of the hot air heated by the heat exchanger flows toward the rear end opening of the cowling body, so that the amount of the hot air is small. In particular, since the side cowling has the above-mentioned inflatable portion, suction force acts on the outlet at the rear end of the inflatable portion due to the airflow flowing backward on the outer surface of the horizontally elongated inflatable portion. Promotes the discharge of hot air from the outlet. Accordingly, the amount of hot air flowing toward the rear end opening of the cowling body is further reduced. In other words, the hot air can efficiently flow out of the cowling from a relatively small vertically long outlet.
Furthermore, the air is introduced into the space between the lower part of the engine and the side cowling from the vertically long inlet provided in the side cowling, and blows through this space at a high speed, so that the air cooling effect on the lower part of the engine is high. In addition, a part of the outside air introduced from the vertically long inlet is mixed with hot air flowing toward the rear end opening of the cowling body (a part of the hot air heated by the heat exchanger) to lower the temperature. . In particular, since the introduction port is provided at the rear end of the recess provided on the cowling side portion, the suction force acts on the vertically long introduction port at the rear end of the recess due to the air flow that flows backward along the inner surface of the recess. , Promotes the inflow of outside air from this vertically long inlet. In other words, a relatively small inlet allows a large amount of outside air to efficiently flow into the cowling. Therefore, the heat radiated from the surface of the engine is hard to collect in the space inside the cowling, and the temperature of the hot air blown behind the cowling body is lowered, so that the thermal effect of the hot air on the driver is significantly reduced. Further, the above-mentioned vertically long outlet and vertically long inlet of the side cowling are opened rearward at the rear end of the horizontally long bulging portion and the horizontally long recess provided on the outer wall surface of the side cowling, respectively. ,
This side cowling can be injection-molded using a molding die that is divided into two parts, left and right. In addition, the upper cowling that covers the periphery of the head pipe from the front can be injection-molded using a molding die that is divided into two in the front-rear direction.
Further, the lower cowling that covers the engine from below can also be injection-molded using a molding die that is divided into two in the vertical direction. Therefore, the cowling body having the intake and the inlet of the traveling wind and the outlet of the hot air can be easily manufactured by injection molding of the plastic material, and the structure of the mold for that can be avoided from being complicated. Therefore, the operation of taking out the injection molded article from the mold is relatively easy, and the shape of the mold is not complicated, so that the production cost of the mold can be reduced. Therefore, the above problems can be sufficiently solved by the above means.

[0006]

[Examples] Next, examples will be described with reference to the drawings. A front fork 25 is supported by a head pipe 1a located at the front end of the cradle type frame 1 of the motorcycle. A bar handle 6 is provided at the upper end of the front fork 25, and a main pipe 1b extending backward and a down tube 3 extending downward are connected to the head pipe. A water-cooled V-type engine 2 is mounted therebetween. The V-type engine 2 includes a crankcase 2a, a front cylinder 2b extending substantially horizontally forward from a front surface of the crankcase 2a, and a rear cylinder 2c extending obliquely upward from the upper surface of the crankcase 2a. I have. A radiator 4 is attached to the front surface of the down tube 3. The radiator 4 is located above the front cylinder 2b and in front of the rear cylinder 2c. In FIG. 1, reference numeral 26 denotes a fuel tank, 27 denotes a seat on which a driver sits, and the seat 27 is disposed at an upper rear portion of the V-type engine 2. By the way, a cowling 5 made of synthetic resin is attached to the frame 1. On the front surface of the cowling body 5a of the cowling 5, which continuously covers the head pipe 1a from the front side to the lower side of the V-shaped engine 2,
There is an inlet 8 for traveling wind that opens to the front of the engine 2, and the radiator 4 is located inside this inlet 8. For this reason, the traveling wind taken in from the intake 8 passes through the radiator 4 and then flows backward between the V-type engine 2 and the left and right side walls of the cowling main body 5a. A flange portion 9 extending inward over the entire circumference is formed at the opening edge of the intake 8 (FIG. 2). The flange portion 9 is provided for reinforcing the cowling main body 5a. On the front surface of the cowling body 5a, there is a window 10 above the inlet 8, and a front lens of the headlamp 7 is attached to the window 10. At the center of the left and right side walls of the cowling body 5a, a laterally elongated bulging portion 20 is formed to project outward, and the front end of the laterally elongated bulging portion 20 is flush with the outer surface of the cowling body 5a. From there, the amount of overhang to the side gradually increases as you move backward. At the rear end of the horizontally long bulging portion 20, a vertically long discharge port 11 connected to the inside of the cowling main body 5 a is opened rearward on the left and right side walls of the cowling main body 5 a. The vertically elongated outlet 11 is located immediately behind the radiator 4 (FIG. 1). Most of the hot air that has been heated by passing through the radiator 4 is discharged to the outside of the cowling body 5a from the vertically long discharge port 11. On the left and right side walls of the cowling main body 5a, there are formed horizontally long concave portions 21 which are located below the horizontally long bulging portions 20 and are recessed inside the cowling main body 5a. The front end of the horizontally long concave portion 21 is flush with the outer surface of the cowling body 5a (FIG. 5), and the amount of depression toward the inside of the cowling body 5a gradually increases toward the rear from here. . And this horizontally long concave portion 2
At the rear end of 1, a vertically long inlet 12 is formed to be continuous with the inside of the cowling main body 5 a. The vertically long inlet 12 is located on the side of the front cylinder 2b and at substantially the same height as the crankcase 2a. The traveling wind flowing along the outer side surface of the cowling main body flows along the horizontally long concave portion 21, flows into the inside of the cowling main body 5 a from the introduction port 12 opened at the rear end of the horizontally long concave portion 21, and becomes cold. Outside air blows backward through the space between the cowling body 5a, the front cylinder 2b, and the crankcase 2a.
The cowling body 5a is divided into four parts, an upper cowling 13, right and left side cowlings 14, 15 and a lower cowling 16 (FIG. 3). Upper cowling 1
Reference numeral 3 denotes a structure in which a front wall 13a and left and right side walls 13b and 13c are continuous, and has a substantially U-shaped planar shape. Also, the front wall 1 of the upper cowling 13
The window 10 for lighting is opened in 3a, and the portion extending from the lower end edge of the front wall 13a to the front end edges of the side walls 13b and 13c constitutes the upper part of the intake port 8. From the lower end edge of the front wall 13a to the front end edges of the side walls 13b and 13c, a flange forming portion 9a which is a part of the flange portion 9 is formed. A transparent screen 18 is attached to the upper edge of the upper cowling 13 with screws 19. The upper cowling 13 described above is manufactured by injection molding of a synthetic resin material. The mold for this injection molding is divided in the direction of arrow A-A 'in FIG. 3, that is, in the front-back direction of the cowling body 5a, so that the upper cowling 13 as an injection molded product can be easily taken out of the mold. Easily done. Therefore, the upper cowling 13 having the window 10 for light and having a substantially U-shaped plan can be injection-molded without difficulty. The left and right side cowlings 14, 15 are substantially symmetrical. Side cowling 14
As shown in FIGS. 4 and 5, has a gentle curved shape in the front-rear direction, and a flange forming portion 9b which is a part of the flange portion 9 is provided at the front end edge thereof. Then, the lateral cowling 14 has the horizontally long bulging portion 20 having the discharge port 11 and the vertically long inlet port 1
A laterally long concave portion 21 having 2 is formed. The side cowling 14 is also manufactured by injection molding of synthetic resin material. The molding die is shown by arrows BB 'in FIGS. 3 and 4.
The lateral cowling as an injection-molded product is easily and easily taken out of the mold. Therefore, the flange constituent portion 9b, the horizontally long bulging portion 20, and the vertically long discharge port 1
1. The side cowling 14 having the horizontally long recess 21 and the vertically long inlet 12 can be injection molded without difficulty. The same applies to the side cowling 15. Further, the lower cowling 16 has a substantially V-shaped or U-shaped vertical cross-sectional shape, and a flange constituting portion 9c which is a part of the flange 9 is formed at a leading edge thereof. The flange component 9c extends obliquely upward (FIG. 6). The lower cowling 16 is also manufactured by injection molding a synthetic resin material. The molding die is divided in the direction of arrows CC 'in FIGS. 3 and 6, that is, in the vertical direction of the cowling main body 5a, whereby the lower cowling as an injection molded product is easily and easily taken out from the die. Since the vertically long exhaust port 11 is provided immediately after the radiator 4 on the left and right sidewalls of the cowling body 5a, most of the traveling wind that has become hot air that has passed through the radiator travels obliquely outward from the cowling from the vertically long exhaust port 11. Blow through. Therefore, the amount of hot air flowing backward in the space inside the cowling main body and flowing backward from the rear end of the cowling main body is significantly reduced as compared with the conventional one. Further, the cowling body 5a
The left and right side walls have vertically long inlets 12 for introducing cold outside air between the crankcase 2a of the V-type engine 2 and the right and left side walls of the cowling body 5a. Therefore, between the crankcase 2a and the cowling body 5a. The outside air flows in smoothly, and the temperature of the airflow flowing between the crankcase 2a and the right and left side walls of the cowling main body 5a is lowered, and the airflow of the airflow is increased to increase the flow velocity. As a result, the area around the crankcase 2a can be efficiently cooled, and the thermal effect on the driver due to the hot air blown behind the cowling body 5a is significantly reduced. Thus, without widening the lower left and right widths of the lower portion of the cowling main body 5a or without increasing the opening area of the front surface, the airflow that blows backward between the crankcase 2a and the left and right side walls of the cowling main body 5a causes the crankcase to be rotated. It can be cooled sufficiently, and the temperature of the hot air that blows backward from the rear end of the cowling main body can be lowered, which may cause problems such as insufficient bank angle or increased air resistance due to the cowling. Absent. Further, the vertically long inlet 12 is provided with the cowling body 5.
Since it is for taking the traveling wind into the inside of a, the opening area thereof may be smaller than that of the vertically long outlet 11 for discharging the hot wind passing through the radiator 4. Therefore, the vertical inlet 12 is not so noticeable,
The appearance of the cowling body is not impaired.

[0007]

[Effect] Most of the running wind that has been heated by passing through the heat exchanger is blown out diagonally outward from the cowling main body to the outside of the cowling main body before reaching the rear end of the cowling main body, and at the same time the lower part of the engine and the cowling. Since outside air is introduced into the space between the main body and the cowling main body through the vertically long inlets, the flow rate of the air flow flowing through the space is increased and the flow velocity is increased. Therefore, it is possible to efficiently cool around the engine without increasing the left and right width of the lower portion of the cowling main body, and it is possible to effectively prevent heat from accumulating around the engine. Also, of the heated hot air that has passed through the heat exchanger, the hot air that has not blown out from the vertically elongated discharge port flows backward in the cowling toward the rear end of the cowling body. It mixes with the outside air flowing in from the mouth, thereby lowering the temperature. Therefore, the amount of traveling air flowing backward from the rear end of the cowling is reduced, and the temperature is also reduced by the outside air flowing from the inlet, so that the thermal influence on the driver due to the hot air of the traveling wind flowing backward through the cowling is significantly reduced. In addition, a comfortable driving environment can be created in combination with the windproof effect of the cowling. In addition, the outlet is provided at the rear end of the horizontally protruding bulging portion that protrudes outward, and the vertically long inlet is provided at the rear end of the horizontally long concave portion that is depressed inward, so that hot air from the outlet can be removed. Since the discharge and the introduction of outside air from the vertically long inlets are extremely efficient, the opening area of these outlets and inlets can be made as small as possible, and therefore the presence of these openings The appearance of the cowling is not impaired at all. Furthermore, the cowling body is divided into an upper cowling, left and right side cowlings and a lower cowling, so that the cowling body having an outside air inlet and a hot air outlet can be injection molded using a relatively simple mold. In addition, the mold can be divided into two halves as described above, so that the operation of taking out the injection molded product from the mold during the injection molding can be simplified and facilitated. it can. Therefore, the cowling body can be easily and efficiently produced. Further, since the mold has a simple shape structure, the manufacturing cost of the mold can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle.

FIG. 2 is a side view of the cowling.

FIG. 3 is an exploded perspective view of the cowling.

FIG. 4 is a sectional view taken along line XX of FIG.

FIG. 5 is a sectional view taken along line YY of FIG. 3;

6 is a sectional view taken along line ZZ in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frame 1a ... Head pipe 2 ... Engine 4 ... Heat exchanger (radiator) 5 ... Cowling 5a ... Cowling main body 8 ... Inlet 11 ... Vertical exhaust Outlet 12 ・ ・ ・ Vertical introduction port 13 ・ ・ ・ Upper cowling 14, 15 ・ ・ ・ Side cowling 16 ・ ・ ・ Lower cowling 20 ・ ・ ・ Horizontal inflatable part 21 ・ ・ ・ Horizontal recess

Claims (1)

[Claims] 1. A cowling body which covers a left and right side of the engine and a lower part of the engine from around a head pipe at a front end of the frame is mounted on a frame supporting the engine, and a running wind opening forward of the engine in the cowling body. In the motorcycle in which the intake of the engine is provided and the heat exchanger of the engine is arranged inside the intake, the cowling main body includes an upper cowling that covers around the divided head pipe from the front, A left and right side cowling, which is a substantially flat plate and covers the left and right sides of the engine continuously, and a lower cowling that covers the lower part of the engine continuously to the side cowlings. Both side cowling and lower cowling are injection molded products of synthetic resin material, On the outer wall surfaces of the left and right side cowlings, a laterally bulging portion that protrudes toward the side of the cowling body as it goes backward, and a cowling body that is located below the laterally bulging portion and goes backward. A laterally concave portion that is depressed inward is formed, and a rear end of the laterally bulging portion of the side cowling is located behind the heat exchanger, and hot air that has passed through the heat exchanger is cowled. A vertically long discharge port for discharging outside is opened rearward, and a vertically long introduction port for introducing outside air between the cowling body and the lower side surface of the engine is provided at the rear end of the horizontally long recess. A cowling device for a motorcycle, characterized in that the cowling device is opened toward the vehicle.