JP2534679B2 - Motorcycle - Google Patents

Description

The present invention relates to a motorcycle provided with a cowling.

[Prior art]

Conventionally, in a motorcycle where a cowling that covers a water-cooled engine is attached to the frame and a radiator is arranged at the cooling air inlet opening on the front of this cowling, the hot air passing through the radiator is directed to the outside of the cowling on the side of this cowling. It has an exhaust port for escape and an intake port for guiding the running wind to the inside of the cowling.

[Problems to be solved by the invention]

However, when the vehicle is stopped due to traffic congestion, for example, the traveling wind that flows into the cowling from the intake decreases, and the ventilation in the cowling deteriorates. There was a problem that it climbed up to the driver side through the gap between them.

Further, particularly in such an operating state, since the radiator fan often operates, there is a problem that the hot air from the radiator blows out toward the driver side from the above-mentioned gap to give the driver discomfort.

The present invention has been made based on such circumstances, and it is possible to prevent the hot air from the radiator from blowing toward the driver, and moreover, the heat effect from the water-cooled engine or the exhaust pipe can be suppressed as much as possible. To obtain a motorcycle that can provide a comfortable driving environment.

[Means for solving problems]

In order to achieve the above object, the present invention provides a water-cooled engine arranged in front of a riding position; an exhaust pipe connected to a front surface of the water-cooled engine and extending downward through the front of the water-cooled engine; It is assumed that the motorcycle includes a cowling that covers the periphery of the water cooling engine and has a cooling air inlet opening in front of the water-cooled engine; and a radiator disposed at the cooling air inlet of the cowling.

Then, on the side surface of the cowling, an exhaust port for letting out the hot air that has passed through the water-cooled radiator to the outside of the cowling and an intake port for taking in outside air inside the cowling are provided side by side. The mouth is located on the side of the water-cooled engine, behind the connecting portion of the water-cooled engine and the exhaust pipe, and the heat shield wall interposed between the engine and the cowling is provided on the inner surface of the cowling. However, the heat shield wall is in front of the opening position of the intake port and the first wall portion extending in the up-down direction passing behind the opening position of the exhaust port, and the intake port and the exhaust pipe. A second wall portion that extends in the up-and-down direction passing through between the water cooling engine and a connection portion with the water cooling engine, and a third wall portion that connects the lower end of the first wall portion and the upper end of the second wall portion. Having the first wall and The second wall portion and the second wall portion are each inclined forward as they go upward, and the tip portion of the heat shield wall is provided along the side surface of the water-cooled engine.

[Action]

According to such a configuration, the heat shield wall closes the gap between the inner surface of the cowling and the water-cooled engine at the rear of the radiator, so that the hot air from the radiator hits the heat shield wall and moves rearward from it. Is blocked and most of it is discharged to the outside of the cowling through the exhaust port.

In addition, this heat shield wall bypasses the front of this intake port at the opening of the outside air intake port, so the flow of outside air guided from the intake port to the inside of the cowling is not blocked by the heat shield wall. The ventilation inside the cowling is kept good.

Therefore, it is possible to prevent the hot air from the radiator from blowing out from the rear end of the cowling toward the driver,
Discomfort is alleviated compared to the conventional case. At the same time, the hot air of the water-cooled engine and the exhaust pipe is less likely to be trapped inside the cowling, and the thermal effect on the driver can be suppressed.

Further, according to the above configuration, the temperature of the exhaust pipe becomes high during the operation of the engine, and in particular, the temperature of the connecting portion with the water-cooled engine becomes the highest. In this case, since the heat shield wall is located rearward of the connecting portion between the exhaust pipe and the water-cooled engine, even if hot air from around the engine including the connecting portion may flow rearward, The flow of can be blocked by the heat shield wall. Moreover, the first of the heat shield wall
Since the second wall portion is inclined forward as it goes upward, the hot air rising from the exhaust pipe or the water-cooled engine is guided forward along with the inclination of the heat shield wall and is kept away from the driver. At the same time, it is eventually guided around the exhaust port and discharged to the outside of the cowling through this exhaust port.

Therefore, it is possible to reliably prevent the hot air of the exhaust pipe or the water-cooled engine rising between the cowling and the water-cooled engine from being directed toward the driver, especially when the motorcycle is stopped or running at low speed. The heat effect of can be suppressed as much as possible.

Example of Invention

The present invention will be described below based on an embodiment shown in the drawings.

In FIG. 1, reference numeral 1 is a frame, and a pair of left and right main pipes 4 extending rearward and a down tube 5 are connected to a steering head pipe 2 at a front end of the frame. Rear ends of the main pipe 4 and the down tube 5 are connected to each other by a pivotal support portion 3 of a rear arm, and a water-cooled engine 6 is mounted between the main pipe 4 and the down tube 5. The cylinder 7 of the water-cooled engine 6 is largely tilted forward, and a down-draft type carburetor 8 and an air cleaner 9 are arranged above the cylinder 7.

Further, as shown in FIG. 1, a plurality of exhaust pipes 19 are connected to the front surface of the cylinder 7. These exhaust pipes 19
The water-cooled engine 6 after extending downward from the cylinder 7.
It is led to the rear through the lower part of.

A radiator 10 of the water-cooled engine 6 is attached to the upper end of the down tube 5. The radiator 10 is located in front of the upper portion of the cylinder 7, and a radiator fan 11 is provided immediately after the radiator 10.

By the way, the frame 1 has a cowling 12 made of FRP.
Has been fixed. The cowling 12 of this embodiment includes an upper cowl portion 13 that covers the front of the steering head pipe 2.
And an under cowl portion 14 that continuously covers the upper cowl portion 13 and covers the left and right sides of the water-cooled engine 6 from the lower side, and the radiator 10 is arranged in a cooling air introduction port 15 that is opened on the front surface of the cowling 12. Has been done. The under cowl portion 14 is bolted to the down tube 5 and the main pipe 4 and is located in front of the driver's leg A as shown in FIG. ing.

On the side surface 14a of the under cowl portion 14, an exhaust port 16 that escapes the hot air that has passed through the radiator 10 to the outside of the cowling 12 and an intake port 17 that takes in the traveling wind inside the under cowl portion 14 are opened side by side. There is. The exhaust port 16 is opened rearwardly and obliquely outward of the radiator 10 and is located just on the side of the upper end of the cylinder 7. Intake 17
Is located below the exhaust port 16, and the intake port 17
Is opened toward the front on the side of the cylinder 7, and is located rearward of the connecting portion between the cylinder 7 and the exhaust pipe 19.

Also, at the lower part of the front end of the side surface 14a, the under cowl portion 1
Ventilation port 18 that guides outside air to the bottom side of 4 is opened toward the front, and the outside air that has flowed in from this ventilation port 18 while traveling is
The exhaust pipe 19 and the oil pan 20 of the water-cooled engine 6 are cooled.

In addition, the bottom surface of the under cowl portion 14 is notched toward the rear in order to obtain a bank angle.
Exhaust pipe 19 is exposed from.

On the other hand, a heat shield wall 22 extending inward is attached to the inner side surface 14b of the under cowl portion 14. This heat shield wall 22 is
As shown in FIG. 1 and FIG. 2, the first wall portion 22a extending in the vertical direction immediately after the opening position of the exhaust port 16 is provided.
Immediately before the opening position of the intake port 17, a second wall portion 22b extending in the up-down direction passing between the connection portion of the exhaust pipe 19 and the cylinder 7 and the intake port 17, and the first wall portion 22b. And a third wall portion 22c connecting the lower end of the wall portion 22a and the upper end of the second wall portion 22b.

The first wall portion 22a and the second wall portion 22b are vertically offset from each other, and are inclined forward as they move upward. Therefore, the first wall portion 22a and the second wall portion 2
The third wall portion 22c connecting to 2b is inclined rearward as it goes upward, and the inclination direction is opposite. In addition, the first wall portion 22 a has an extension portion 22 d that extends forward from the upper end thereof toward the radiator 10, and the extension portion 22 d is located above the exhaust port 16. And
As shown in FIG. 3 and FIG. 4, the heat shield wall 22 has flange portions 23 provided at a plurality of portions thereof and an under cowl portion 14.
The boss portion 24 extending from the inner side surface 14b is fixed by being fastened with a screw 25, and one side edge of the heat shield wall 22 is in contact with the inner side surface 14b of the under cowl portion 14. The other side edge, which is the tip of the heat shield wall 22, is formed along the outer side surface of the cylinder 7, and the other side edge is made of an elastic material such as heat resistant rubber that is in contact with the outer side surface of the cylinder 7. Seal material
26 is installed. Therefore, the heat shield wall 22 is located in front of the rear end of the cowling 12 and is located on the inner surface 14 of the under cowl portion 14.
The gap 34 between b and the cylinder 7 is closed.

Further, the under cowl portion 14 of the present embodiment has a three-part structure of left and right panel portions 27, 28 and an inner panel portion 29 located at the lower end portion of the cooling air introduction port 15, as shown in FIG. There is. The left and right panel parts 27, 28 are connected at their lower end edges with each other by abutting against each other via a screw 30 and a nut 31, and the inner panel part 29 is provided with the left and right panel parts 2.
The front end edges of the panel portions 27, 28 are connected to each other by being fastened and fixed to the front edge portions of the 7, 28 via screws 32 and nuts 33.

According to such a configuration, the inner surface of the under cowl portion 14
At 14b, a heat shield wall 22 which passes behind the opening position of the exhaust port 16 and passes in front of the opening position of the intake port 17 and extends in the up-down direction is attached, and by this heat shield wall 22, the under cowl portion 14 Since the gap 34 between the inner side surface 14b and the cylinder 7 is closed, not only the cooling air that has passed through the radiator 10 while traveling but also the radiator fan 11 is operated while the vehicle is stopped.
The hot air discharged from the under cowl section 14 from the 10 is the heat shield wall.
When it hits 22, the flow behind it is blocked. Therefore, the hot air is discharged to the outside of the cowling 12 from the exhaust port 16 in front of the leg A without blowing out from the gap 34.

Further, since the heat shield wall 22 bypasses the front of the outside air intake port 17, outside air flows into the rear side of the heat shield wall 22 through the intake port 17, and this inflowing outside air has the above gap.
It will be guided from 34 toward leg A.

Therefore, the driver does not have to be directly exposed to the hot air from the radiator 10, and the discomfort caused by the hot air can be significantly reduced as compared with the conventional case.

Further, according to the above configuration, the exhaust pipe of the water-cooled engine 6
No. 19 has a high temperature during engine operation, and in particular, the temperature of the portion connected to the cylinder 7 is the highest, so that the amount of hot air generated from this is large. In this case, the heat shield wall 22
Since the second wall portion 22b of the above is located rearward of the connecting portion between the exhaust pipe 19 and the cylinder 7, the hot air is removed by the cowling 14.
Even if it may flow backward through the gap 34 inside,
This hot air is blocked by the heat shield wall 22.

Moreover, the first and second wall portions 22a, 22b of the heat shield heat 22
Is inclined forward as it goes upward, so that hot air rising from the exhaust pipe 19 and the water-cooled engine 6 is guided forward as the first and second wall portions 22a, 22b are inclined, While being guided in a direction away from the exhaust gas, it is eventually guided to the opening portion of the exhaust port 16 and discharged to the outside of the cowling 12 through the exhaust port 16.

Therefore, particularly when the motorcycle is stopped or running at low speed, it is necessary to reliably prevent the hot air from the exhaust pipe 19 or the water-cooled engine 6 that rises through the gap 34 inside the cowling 12 from being guided toward the driver. As a result, the heat effect on the driver can be minimized.

In carrying out the present invention, the cylinder may be erected more than in the above embodiment, and a carburetor and an air cleaner may be arranged behind the cylinder.

According to this configuration, around the intake port of the air cleaner,
Since the outside air flowing in through the intake port is guided, the intake air temperature can be kept low, and the intake air charging efficiency becomes good.

〔The invention's effect〕

According to the invention described in detail above, since the heat shield wall closes the gap between the inner surface of the cowling and the water-cooled engine, the hot air from the radiator is discharged from the exhaust port in front of the driver to the outside of the cowling. Then, the outside air introduced from the intake port is guided to the driver side.

Therefore, the hot air from the radiator does not blow out to the driver side through the gap between the cowling and the water-cooled engine, and the discomfort caused by the hot air can be significantly reduced.

Moreover, since the second wall of the heat shield wall is located rearward of the connecting portion between the exhaust pipe and the water-cooled engine, hot air from the exhaust pipe and the water-cooled engine may flow rearward through the inside of the cowling. Even if there is, this hot air is blocked by the heat shield wall. Moreover, since the first and second wall portions of the heat shield wall are inclined forward as they go upward,
The hot air rising from the exhaust pipe or the water-cooled engine is guided forward in accordance with the inclination of the heat shield wall, is guided in the direction away from the driver, and is eventually discharged to the outside of the cowling through the exhaust port.

Therefore, especially when the motorcycle is stopped or traveling at low speed, it is possible to reliably prevent the hot air that rises along the inside of the cowling from being directed to the driver, and suppresses the thermal effect on the driver as much as possible. There is an advantage that you can.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a side view of a motorcycle, Fig. 2 is a side view of a cowling, and Fig. 3 is a sectional view taken along line III-III in Fig. 1, Fig. 4 Is a cross-sectional view of the mounting portion of the heat shield wall, FIG. 5 is a front view of the motorcycle, FIG. 6 is a plan view of the motorcycle, FIG. 7 is a front view in which the under cowl portion is disassembled, and FIG. FIG. 9 is a sectional view of a connecting portion of the panel portion, and FIG. 9 is a sectional view of a connecting portion between the panel portion and the inner panel portion. 6 ... Water-cooled engine, 7 ... Cylinder, 10 ... Radiator, 12 ... Cowling, 15 ... Cooling air inlet, 16 ... Exhaust port, 17 ... Intake port, 19 ... Exhaust pipe, 22 ... Heat shield wall,
22a ... first wall, 22b ... second wall, 22c ... third
Wall.

Claims (1)

(57) [Claims] 1. A water-cooled engine arranged in front of a riding position; an exhaust pipe connected to a front surface of the water-cooled engine and extending downward through the front of the water-cooled engine; and covering the periphery of the water-cooled engine and the exhaust pipe. A motorcycle including: a cowling having a cooling air inlet opening in front of the water-cooled engine; and a radiator arranged at the cooling air inlet of the cowling, wherein the radiator passes through a side surface of the cowling. An exhaust port for letting out hot air to the outside of the cowling and an intake port for taking in the outside air inside the cowling are provided side by side, and this intake port is located on the side of the water cooling engine with the water cooling engine. It is located rearward of the connection with the exhaust pipe, and on the inner surface of the cowling, between the water-cooled engine and An intervening heat shield wall is provided so as to project, and the heat shield wall is located in front of the opening position of the intake port and the first wall portion that extends in the up-down direction passing behind the opening position of the exhaust port. A second wall extending vertically between the intake port and the connecting portion between the exhaust pipe and the water-cooled engine; and a lower end of the first wall and an upper end of the second wall. And a third wall portion connecting the first wall portion and the second wall portion. The first wall portion and the second wall portion are inclined forward as they go upward, and the tip end portion of the heat shield wall is a side surface of the water-cooled engine. A motorcycle characterized by being installed alongside.