JP6763273B2 - Motorcycle cooling system - Google Patents

Description

The present invention relates to a cooling device for a motorcycle engine including a radiator and an oil cooler, and a motorcycle provided with the cooling device.

In motorcycles and the like, an air-cooled oil cooler may be installed in combination with a radiator in a water-cooled engine. For example, in the engine described in Patent Document 1, a radiator is arranged on the upper side in front of the engine, an air-cooled oil cooler is arranged on the lower side, and the air-cooled oil cooler is placed on the front side of the vehicle. The lower side has a substantially trapezoidal shape that is shorter in the vehicle width direction.

JP-A-2010-64706

However, in the conventional motorcycle cooling device, the outlet hose is connected to the side surface of the engine case and becomes long, and the two oil hoses overlap each other in the side view. Therefore, if they are left as they are, the two oil hoses may come into contact with each other due to vehicle vibration and be damaged. Since the oil hose is composed of three parts, an iron pipe, a rubber hose, and an iron pipe, the oil hose itself may vibrate due to hydraulic pulsation.
In addition, since the outlet hose is connected to the side surface of the engine case, that is, the outlet hose has a piping structure protruding to the outside of the vehicle, it is easy to come into contact with other parts, especially in a narrow space, and there is a risk of damaging each other as well. ..

Furthermore, when the outlet hose protrudes to the outside of the vehicle, the shape of the cowling (under cowl) on the outside swells, and the exhaust air from the oil cooler easily flows to the rear of the vehicle through the gap between the two, causing heat to the rider's feet. Harm measures are not always sufficient. Further, due to the piping structure of the oil hose protruding to the outside of the vehicle in this way, the degree of freedom in designing the cowling had to be restricted.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a cooling device for a motorcycle capable of compactly and appropriately piping an oil hose and effectively suppressing heat damage to a rider.

The cooling device for a motorcycle of the present invention is a cooling device for a motorcycle in which an engine is mounted at a predetermined portion of a vehicle body frame, and a radiator is arranged on the upper side in front of the engine and air-cooled oil is placed on the lower side. A cooler is arranged so that the oil cooler has a substantially trapezoidal shape whose lower side is shorter in the vehicle width direction than its upper side when viewed from the front of the vehicle, covers at least both sides of the engine, and the radiator and the said in the inner space thereof. The oil cooler is provided with a cowling in which an oil cooler is arranged, and the oil cooler is provided with tank portions on the inlet side and the outlet side arranged side by side on one side in the vehicle width direction, and these tank portions and the engine. The inlet side and outlet side oil hoses connected to the engine are arranged unevenly on one side in the vehicle width direction in which the tank portion is arranged, and the engine side connection destinations of the two oil hoses are vehicles. It is arranged unevenly on one side in the width direction and set on the front surface of the engine case, and the two oil hoses are piped along the same plane when viewed from the front of the vehicle, and the two oil hoses are connected to the engine side. The tip is located at a height between the upper side and the lower side of the oil cooler in the front view of the vehicle, and is substantially the same position as the outer end of the upper side of the oil cooler or the outer end of the upper side of the oil cooler in the vehicle width direction. The connection destination of the oil hose on the outlet side on the oil cooler side is located below the connection destination on the oil cooler side of the oil hose on the inlet side and inside in the vehicle width direction, and the outlet is located inside. The engine-side connection destination of the oil hose on the side is located below the engine-side connection destination of the oil hose on the inlet side .

According to the present invention, the length of the oil hose can be shortened by setting the connection destination of the oil hose on the engine side to the front surface of the engine case, and the oil hose can be compactly and properly piped. In addition, by closing the gap between the oil hose piping structure and the cowling, heat damage to the rider can be effectively suppressed.

It is a figure which showed the whole structure of the motorcycle which provided the arrangement structure of the cooling device by this invention. It is a perspective view from the right front around the engine unit of the motorcycle provided with the arrangement structure of the cooling device by this invention. It is a left side view seen from the left around the engine unit of the motorcycle provided with the arrangement structure of the cooling device by this invention. It is a front view seen from the front around the engine unit of the motorcycle provided with the arrangement structure of the cooling device by this invention. It is a figure which looked at the cooling device of the motorcycle provided with the arrangement structure of the cooling device by this invention from the front view of the vehicle. It is a side view seen from the right around the engine unit of a motorcycle provided with the arrangement structure of the cooling device according to this invention. It is a figure which shows typically the circumference of the connection destination on the engine case side in the arrangement structure of the cooling device by this invention. It is a figure seen from the front of the vehicle which shows the relationship between the arrangement structure of the cooling device by this invention, and a cowling. It is a rear perspective view which shows the relationship between the arrangement structure of the cooling device and a cowling by this invention.

Hereinafter, preferred embodiments of the motorcycle cooling device according to the present invention will be described with reference to the drawings.
The motorcycle cooling device according to the embodiment of the present invention is a motorcycle cooling device in which an engine is mounted on a predetermined portion of a vehicle body frame, and a radiator is arranged on the upper side in front of the engine and a lower side. An air-cooled oil cooler is placed on the side, and the oil cooler has a substantially trapezoidal shape whose lower side is shorter in the vehicle width direction than the upper side when viewed from the front of the vehicle, covers at least both sides of the engine, and is inside the engine. A cow ring in which the radiator and the oil cooler are arranged is provided in the space, and the oil cooler is provided with tank portions on the inlet side and the outlet side arranged side by side on one side in the vehicle width direction. The inlet side and outlet side oil hoses connected to the tank portion and the engine are arranged unevenly on one side in the vehicle width direction in which the tank portion is arranged, and the engines of the two oil hoses are arranged. The side connection destination is set on the front surface of the engine case, and the two oil hoses are laid along the same plane when viewed from the front of the vehicle.

In the motorcycle cooling device according to the present invention, the length of the oil hose can be shortened by setting the connection destination of the oil hose on the engine side to the front of the engine case, and the compact and appropriate piping of the oil hose can be obtained. It will be possible.

FIG. 1 is a diagram showing an overall configuration of a motorcycle 100 provided with a cooling device according to the present invention. First, a schematic configuration of the entire motorcycle 100 will be described with reference to FIG. In the drawings used in the following description, the direction in which the rider riding on the motorcycle 100 looks at the front of the vehicle is defined as the front, and the opposite direction is defined as the rear. In addition, the right side of the rider is to the right and the left side is to the left, and these directions are indicated by arrows as necessary.

In FIG. 1, two left and right front forks 103 that are rotatably supported by a steering head pipe 102 are provided on the front portion of a pair of left and right body frames 101 made of steel or an aluminum alloy material. The pair of left and right vehicle body frames 101 are connected in front of the vehicle, and a steering head pipe 102 is provided at the connecting portion, and the steering center is arranged here. A handlebar 104 is fixed to the upper end of the front fork 103, and the handlebar 104 has grips 105 at both ends thereof. The front wheel 106 is rotatably supported on the lower part of the front fork 103, and the front fender 107 is fixed so as to cover the upper part of the front wheel 106. The front wheel 106 has a brake disc 108 that rotates integrally with the front wheel 106.

The vehicle body frame 101 branches rearward from the steering head pipe 102 in a bifurcated manner on the left and right, and each of the vehicle body frame 101 is inclined backward and extends. A swing arm 109 is swingably coupled to the rear portion of the vehicle body frame 101, and a rear shock absorber 110 is mounted between the two. A rear wheel 111 is rotatably supported at the rear end of the swing arm 109. The rear wheel 111 is rotationally driven via a driven sprocket 113 around which a chain 112 for transmitting engine power, which will be described later, is wound. An inner fender 114 covering the vicinity of the front upper portion thereof is provided in the immediate vicinity of the rear wheel 111, and a rear fender 115 is arranged above the inner fender 114.

An air-fuel mixture is supplied from the fuel injection device 116 to the engine unit 10 (single-point chain line portion) mounted on a predetermined portion of the vehicle body frame 101, and the exhaust gas after combustion in the engine passes through the exhaust pipe 117. It is exhausted. In the present embodiment, the engine may be, for example, a 4-cycle multi-cylinder (4-cylinder) engine. The exhaust pipe 117 of each cylinder is coupled at the lower side of the engine unit 10, and then is exhausted from the muffler 119 near the rear end of the vehicle via the exhaust chamber 118.

A fuel tank 120 is mounted above the engine unit 10, and seats 121 (rider seats 121A and tandem seats 121B) are continuously provided behind the fuel tank 120. Footrests 122A and 122B are arranged below the rider seat 121A and the tandem seat 121B, respectively. In this example, the prop stand 123 is provided on the left side of the vehicle at a substantially lower center in the front-rear direction. The fuel injection device 116 is arranged in the inner recess of the fuel tank 120, and is located above the engine unit 10 to be compactly housed.

In addition, various accessories are provided in front of the handlebar 104. For example, the headlamp 124 is installed in the fairing 128 at the foremost part of the vehicle body, and the meter unit 125 including the speedometer, tachometer, various indicator lamps, etc. is provided on the handlebar 104 in the space covered by the fairing 128. It is installed in front. A rear-view mirror 126 is provided on the upper portion of the fairing 128 via a stay 127.

In the exterior of the vehicle, the fairing 128 and the side cowl 129, which are cowlings, mainly cover the front and side parts of the vehicle, and the side cover 130 or the seat cowl 131 is attached to the rear part of the vehicle, which is so-called. The appearance form of the vehicle having a streamlined shape is formed. At the front end of the fairing 128, an air intake 132 for supplying air to an air cleaner (not shown) forming a part of the fuel injection device 116 is opened.

Next, the configuration around the engine unit 10 in this embodiment will be described with reference to FIGS. 2 to 4. FIG. 2 is a perspective view of the engine unit 10 from the front right, FIG. 3 is a left side view of the engine unit 10 from the left, and FIG. 4 is a front view of the engine unit 10 from the front. Is.

The engine unit 10 is supported by being appropriately tilted forward so as to be sandwiched between a pair of left and right body frames 101, and is arranged below the fuel tank 120 in the lower center of the vehicle body of the motorcycle 100. In the engine unit 10, the cylinder block 12, the cylinder head 13, and the cylinder head cover 14 are integrally coupled to the upper part of the crankcase 11 which is an engine case. The cylinder block 12 integrally provided with a plurality of cylinders (cylinders) is arranged in the width direction of the vehicle body in a slightly forward tilted state. In this example, the four cylinders included in the cylinder block 12 are juxtaposed in the left-right (vehicle width) direction, and are No. 1 (# 1), No. 2 (# 2), No. 3 (# 3), and No. 4 (#) in order from the left side. 4) Use a cylinder (Fig. 4). As described above, the engine unit 10 may have four cylinders, but it is a side cam chain type parallel multi-cylinder engine in which each cylinder shaft is mounted so as to be slightly tilted forward from the vertical. The cylinder block 12 is integrally molded with (a part of) the crankcase 11 by aluminum die casting.

An accessory device such as an intake device, an exhaust device, and a cooling device, auxiliary equipment, and the like are attached to or mounted on the engine unit 10. As an intake device, air cleaned by an air cleaner arranged in front of the fuel tank 120 (FIG. 1) is supplied to the intake port. The amount of air supplied to this intake port is controlled by the throttle valve. Then, the fuel from the fuel tank 120 is injected and supplied to the intake port by an injector forming a part of the fuel injection device 116.

As an exhaust device, an exhaust pipe 117 (having four exhaust pipes in this example) is connected to the front side of the cylinder head 13 described above, and a muffler 119 is connected to the downstream side thereof. As a cooling device, a radiator 20 and an oil cooler 30 are arranged in front of the engine unit 10. The radiator 20 and the oil cooler 30 are arranged in the inner space of the side cowl 129 that covers both sides of the engine unit 10.

The above is the description of the main configuration around the engine unit 10, but the present invention relates to the arrangement of the cooling device including the radiator 20 and the oil cooler 30. Therefore, in the following, the cooling water cooling of the engine unit 10 by the radiator 20, the lubricating oil cooling by the oil cooler 30, and the arrangement structure thereof will be described in detail with reference to FIGS. 2 to 4. In addition, FIGS. 5 to 7 are referred to as appropriate.

First, the cooling water cooling of the engine unit 10 by the radiator 20 will be described. In the cylinder block 12 and the cylinder head 13 of the engine unit 10, a water jacket (not shown) is formed around each cylinder, and cooling water cooled by the radiator 20 is supplied to the water jacket. The radiator 20 is arranged in front of the cylinder block 12 of the engine unit 10, and has a substantially rectangular shape when viewed from the front of the vehicle as referred to in FIG.

The radiator 20 is supported at an appropriate position on the vehicle body frame 101 or the cylinder block 12 via a stay or the like, and a fan 21 is attached to the back side thereof as shown in FIG. The radiator 20 adopts a so-called cross-flow type (cross-flow) side tank system, and has an outlet side tank portion 22 on the left side thereof, and an inlet side tank portion 23 and a radiator cap 24 on the right side thereof. ing. Cooling water discharged through the cylinder block 12 and the water jacket in the cylinder head 13 flows into the inlet-side tank portion 23, and the cooling water is discharged through a tube having a plurality of fins joined to the periphery. It is pumped to the side tank portion 22. Then, the cooling water that has been pumped to the outlet side tank portion 22 and cooled is pumped to the water pump 25 installed on the left side side of the engine unit 10 via the outlet side radiator hose 26.

Here, the flow of cooling water circulation will be described. The water pump 25 is installed diagonally below and behind the generator cover 16 that covers the crankshaft 15 of the engine unit 10 on the left side. An outlet-side radiator hose 26 extending rearward from the outlet-side tank portion 22 is coupled to the water pump 25, and cooling water cooled by the radiator 20 flows into the water pump 25. The water pump 25 pumps the cooling water flowing in by the impeller provided inside to the water jacket in the cylinder block 12 via the cylinder inlet hose (cooling water supply hose) 27 (FIG. 3). The cylinder inlet hose 27 extends upward from the water pump 25 to a gate (not shown) formed on the rear surface side of the cylinder block 12 so as to follow the outer shape of the engine unit 10, to be exact, near the cylinder head 13. Cooling water flows into the water jacket that is combined and formed in the cylinder block 12.

The cooling water that goes around the inside of the water jacket and cools around the cylinder block 12 and the cylinder head 13 is discharged from a gate formed on the rear surface side of the cylinder head 13. Here, a thermostat is provided at the gate so that the discharge direction is controlled according to the temperature of the cooling water. As shown in FIG. 5, the thermostat cover behind the cylinder head 13 of the engine and the outlet-side tank portion 22 of the radiator 20 are connected via a bypass pipe 29 passing through the inside of the vehicle body frame 101. When the cooling water is below a certain temperature, the cooling water is pumped to the outlet side tank portion 22 via the bypass pipe 29. On the other hand, when the cooling water is higher than a certain temperature, it flows into the inlet side tank portion 23 via the inlet side radiator hose 28 referred to in FIG. 2, and is then cooled.

The cooling water is cooled in a timely manner in this way, and circulates so as to cool the inside of the cylinder block 12 and the cylinder head 13. The drive source for circulating the cooling water is the water pump 25, and the water pump 25 is driven by transmitting power from the engine unit 10. The water pump 25 rotates by transmitting rotational power from a counter shaft (not shown) to which rotational power is transmitted from the crankshaft 15 driven by starting the engine unit 10, and pumps cooling water. ing.

Next, the lubricating oil cooling by the oil cooler 30 will be described. In the engine unit 10, lubrication cooled by an oil cooler 30 is provided to peripheral parts of the crankshaft 15 (specifically, journal bearings, crank pin bearings, etc.), a transmission, a valve gear in the cylinder head, and the like. Oil is supplied. The oil cooler 30 is arranged below the radiator 20 in front of the engine unit 10. As shown in FIG. 5, the lower side of the oil cooler 30 is shorter than the lower side of the radiator 20 when viewed from the front of the vehicle. It has a substantially trapezoidal shape.

The oil cooler 30 is supported by the cylinder block or the radiator 20 via a stay or the like. The oil cooler 30 is an air-cooled oil cooler, adopts a so-called 2-pass type corrugated fin & tube system, and integrates the inlet side tank portion 31 and the outlet side tank portion 32 arranged vertically on the right side thereof. And have. The inlet side tank portion 31 and the outlet side tank portion 32 are partitioned at the position of the line L shown in FIG.

Lubricating oil stored in the oil pan 33 in the engine unit 10 flows into the inlet side tank portion 31 arranged on the upper side. The lubricating oil is sucked up from the oil pan 33 by an oil pump (not shown) and pumped to the inlet side tank portion 31. After that, the lubricating oil is pumped to the outlet side tank portion 32 arranged on the lower side via a tube to which a plurality of zigzag-shaped (corrugated) fins are joined. The cooled lubricating oil is supplied from the outlet side tank portion 32 to the peripheral portion of the crankshaft 15 of the engine unit 10. The oil pan 33 is attached to the lower part of the crankcase 11 and has a shape that greatly bulges downward on the right side of the vehicle center in the vehicle width direction (see FIG. 4 and the like). In this case, the right side of the oil pan 33 is inclined so that the lower side is to the left as shown in FIG. Then, when the oil pan 33 swells, a recess is generated on the left side thereof, and a plurality of integrated exhaust pipes 117 gathering portions 117'are arranged in the recess (see FIG. 5 and the like).

Here, the flow of the lubricating oil circulation will be described. The lubricating oil stored in the oil pan 33 is first sucked out through a strainer (not shown) by an oil pump installed on the upper side of the oil pan 33, and the oil filter 34 (not shown) is arranged in front of the oil pan 33. It is pumped to (see Fig. 4 etc.). The oil filter 34 removes and cleans foreign matter contained in the pumped lubricating oil. After that, the lubricating oil flows into the inlet-side tank portion 31 of the oil cooler 30 via the inlet-side oil hose 35 extending from the front surface portion of the crankcase 11.

The lubricating oil that has flowed into the inlet side tank portion 31 passes through the tube and is cooled, then flows into the outlet side tank portion 32, and then extends to the front portion of the crankcase 11 via the outlet side oil hose 36. It is sent to the main gallery in the engine unit 10 and supplied to each part of the engine unit 10 such as a portion around the crankshaft 15.

The lubricating oil is circulated in this way and supplied into the engine unit 10. The drive source for circulating the lubricating oil is an oil pump, and the oil pump is driven by transmitting power from the engine unit 10. The oil pump is coaxial with the water pump 25, and the pump shaft of the water pump 25 and the pump shaft of the oil pump are connected to each other. That is, the oil pump rotates by transmitting the rotational power from the counter shaft (not shown) to which the rotational power is transmitted from the crankshaft 15 driven by the start of the engine unit 10, and pumps the lubricating oil. I have to.

In the motorcycle cooling device of the present invention, the inlet side tank portion 31 and the outlet side tank portion 32 and the engine are connected via the inlet side oil hose 35 and the outlet side oil hose 36. The inlet side oil hose 35 and the outlet side oil hose 36 are biased toward the oil cooler 30 on one side in the vehicle width direction in which the inlet side tank portion 31 and the outlet side tank portion 32 are arranged, in this example, on the right side. Arranged.

In particular, FIG. 6 is a right side view of the engine unit 10 as viewed from the right, and as shown in the drawing, the connection destinations of the inlet side oil hose 35 and the outlet side oil hose 36 on the engine side are the crankcase 11 which is an engine case. Set on the front. In this case, the two inlet-side oil hoses 35 and the outlet-side oil hoses 36 are piped along the same plane P as shown by the alternate long and short dash line in FIG. As shown in FIG. 5, this plane P is inclined to the upper left when viewed from the front of the vehicle, and opens substantially in the vertical and front-rear directions.

In a specific configuration, a hose connection plate separate from the crankcase 11 is provided on the front surface of the crankcase 11 to which the inlet side oil hose 35 and the outlet side oil hose 36 are connected to the engine side, as shown in FIG. 37 sticks. The plate 37 is, for example, a plate-like body having a deformed rectangular shape or a polygonal shape, and is arranged in parallel with the oil filter 34 on the front surface of the crankcase 11 as shown in FIG. 4, and is biased to the right side in the vehicle width direction. Will be set up. The plate 37 is fastened and fixed to the front surface of the crankcase 11 by a plurality of bolts 38 at its peripheral portion, and is attached so as to be in an appropriate forward leaning posture as shown in FIG.

With reference to FIG. 7, an oil passage 39 communicating with the oil filter 34 and an oil passage 40 communicating with the main gallery are formed on the front surface of the crankcase 11 to which the plate 37 is attached. A boss portion 41 having an oil hole communicating with the oil passage 39 is projected from the front surface of the plate 37, and is integrated with the boss portion 41 so that the right side is an orthogonal surface to the vehicle width direction. It has a mounting portion 42 having a flange surface). The oil hole of the boss portion 41 opens to the right on the mounting surface 42a. Similarly, a boss portion 43 having an oil hole communicating with the oil passage 40 is projected from the front surface of the plate 37, integrated with the boss portion 43, and the right side is an orthogonal surface to the vehicle width direction. It has a mounting portion 44 having 44a (flange surface). The mounting portion 42 and the mounting portion 44 to which the inlet side oil hose 35 and the outlet side oil hose 36 are connected are arranged in parallel with the oil filter 34 in front view as shown in FIG.

Here, as shown in FIG. 6, the inlet side oil hose 35 has elbows 35A and 35C (made of iron) connected to both ends of the hose portion 35B (made of rubber), that is, it is composed of three parts. Similarly, for the outlet side oil hose 36, elbows 36A and 36C (made of iron) are connected to both ends of the hose portion 36B (made of rubber), that is, it is composed of three parts. A flange 35a is attached to one end of the elbow 35A as shown in FIG. 7, and the flange 35a is polymerized on the mounting surface 42a of the mounting portion 42 and fastened and fixed to the boss portion 41 by bolts 45. The elbow 35A communicates with the oil hole of the boss portion 41. Similarly, a flange 36a is attached to one end of the elbow 36A, and the flange 36a overlaps with the mounting surface 44a of the mounting portion 44 and is fastened and fixed to the boss portion 43 by bolts 46. The elbow 36A communicates with the oil hole of the boss portion 43.

The elbow 35C of the inlet side oil hose 35 and the elbow 36C of the outlet side oil hose 36 are connected to the inlet side tank portion 31 and the outlet side tank portion 32, respectively, as shown in FIG. In this case, flanges 35b and 36b are attached to the elbow 35C and the elbow 36C, and are connected to the right side surface of the oil cooler 30 via these flanges 35b and 36b.

The flanges 35a and 36a of the two inlet-side oil hoses 35 and the outlet-side oil hoses 36 are arranged adjacent to each other as shown in FIG. 6 corresponding to the mounting portions 42 and the mounting portions 44 on the plate 37, respectively. To. That is, corresponding to the mounting portion 42 and the mounting portion 44, the flange 35a and the flange 36a are vertically separated from each other at a predetermined interval H on the plate 37 as shown in FIG. The lunge 35a and the flange 36a do not overlap each other in the side view of the vehicle, that is, they do not overlap.

Further, as shown in FIG. 6, the two inlet-side oil hoses 35 and the outlet-side oil hoses 36 are piped side by side in the vertical direction when viewed from the side of the vehicle, and are spaced apart from each other from the engine side toward the oil cooler 30 side. Becomes larger. That is, as shown in FIG. 6, assuming that the distances H ₁ between the flanges 35b and 36b of the elbow 35C of the inlet side oil hose 35 and the elbow 36C of the outlet side oil hose 36, respectively, H <H ₁ .

Next, the main effects of the cooling device of the motorcycle will be described. First, the engine side connection destinations of the two inlet side oil hoses 35 and the outlet side oil hoses 36 are set to the front surface of the crankcase 11 which is an engine case. In this example, the mounting portion 42 and the mounting portion 44 of the plate 37 are connected to the engine side, but by connecting to the front surface of the crankcase 11, the lengths of the inlet side oil hose 35 and the outlet side oil hose 36 are shortened. be able to.

By connecting the crankcase 11 and the oil cooler 30 at the shortest distance as shown in FIG. 6 and the like, the wobbling of the inlet side oil hose 35 and the outlet side oil hose 36 due to the vehicle vibration of the motorcycle 100 is minimized. It can be suppressed. Then, it is possible to prevent the inlet side oil hose 35 and the outlet side oil hose 36 from coming into contact with each other or with other parts due to vehicle vibration or the like, and to prevent wear due to contact. In the past, the oil hose was connected to the side surface of the engine case and became long, so there was no choice but to cause wobbling due to vehicle vibration or the like.

Further, the inlet side oil hose 35 and the outlet side oil hose 36 are piped along the same plane P (FIG. 5). The oil cooler 30 is arranged in the inner space of the side cowl 129, and the lower portion of the side cowl 129 is formed so as to be tapered downward as shown in FIG. The plane P on which the inlet side oil hose 35 and the outlet side oil hose 36 are piped is inclined to the upper left when viewed from the front of the vehicle as shown in FIG. As a result, the gap between the side cowl 129 and the inlet side oil hose 35 and the outlet side oil hose 36 can be closed while maintaining the lower shape of the side cowl 129.
As described above, the oil cooler 30 has a substantially trapezoidal shape in which the lower side of the radiator 20 is shorter than the lower side of the radiator 20 when viewed from the front of the vehicle. The flat surface P is substantially parallel to the right side surface of the oil cooler 30 to which the inlet side oil hose 35 and the outlet side oil hose 36 are connected. In this way, in particular, by setting the flat surface P so as to match the shape of the oil cooler 30, the gap between the side cowl 129 covering the oil cooler 30 and the inlet side oil hose 35 and the outlet side oil hose 36 is effectively reduced. be able to. Further, as can be seen from FIG. 4, the right side portion of the oil pan 33 is inclined so as to be substantially parallel to the plane P, so that the parts arranged inside the side cowl 129 are also related to the shape of the oil pan 33. Contributes to improving the design of the side cowl 129 by closing the gap.

Here, while the motorcycle 100 is traveling, the exhaust air from the oil cooler 30 is exhausted from the exhaust port 129A behind the side cowl 129, for example, as shown in FIG. 9 (FIG. 9, arrow w ₁ ), or the side. It is discharged from the exhaust port 129B below the cowl 129 (FIG. 9, arrow w ₂ ). In the exhaust air w ₁ , the rider's feet are directed, and as it is, the exhaust air w ₁ from the oil cooler 30 flows as hot air to the rider's feet. By closing the gap between the side cowl 129 and the inlet side oil hose 35 and the outlet side oil hose 36, it is difficult for the exhaust air of the oil cooler 30 to escape to the rear of the vehicle, and by directing it downward to the vehicle, heat damage to the rider is reduced. can do.

Further, since the inlet side oil hose 35 and the outlet side oil hose 36 do not have a piping structure protruding to the outside of the vehicle, there is substantially no effect on the shape of the side cowl 129, which improves the degree of freedom in designing the side cowl 129. It is also advantageous in terms of design.

Further, the inlet side oil hose 35 and the outlet side oil hose 36 are piped side by side in the vertical direction so that the mutual distance increases from the engine side toward the oil cooler 30 side (FIG. 6).
While closing the gap between the side cowl 129 and the inlet side oil hose 35 and the outlet side oil hose 36, a large distance between the inlet side oil hose 35 and the outlet side oil hose 36 is secured. As a result, the inlet side oil hose 35 and the outlet side oil hose 36 can be piped apart from each other or other parts, and wear due to contact can be prevented.

Further, the flange 35a and the flange 36a of the inlet side oil hose 35 and the outlet side oil hose 36 are arranged adjacent to each other corresponding to the mounting portion 42 and the mounting portion 44 on the plate 37, respectively. Although the plate 37 is used in this example, the connection on the engine side can be made compact and the assembling property is improved. In this case, the space between the front surface of the crankcase 11 and the exhaust pipe 117 can be effectively used, and the oil passage 39 and the oil passage 40 can be arranged close to each other.

Further, the flange 35a and the flange 36a of the inlet side oil hose 35 and the outlet side oil hose 36 are fastened to the mounting portion 42 and the mounting portion 44 on the plate 37, respectively. Since the bolts 45 and 46 can be accessed from the side of the vehicle (right side), the fastening work of these bolts 45 and 46 can be performed accurately and efficiently.

In the above embodiment, the inlet side oil hose 35 and the outlet side oil hose 36 are attached to the engine case via a plate 37 which is separate from the crankcase 11 which is an engine case.
By providing a separate plate 37, the bending point for piping the inlet side oil hose 35 and the outlet side oil hose 36 can be reduced, and the oil resistance can be suppressed.
Further, since it is not necessary to provide the crankcase 11 with a convex portion (boss) for attaching the oil hose, the castability of the crankcase 11 does not deteriorate. Since the degree of freedom of the connection destination of the inlet side oil hose 35 and the outlet side oil hose 36 is improved by passing through the plate 37, the oil hose assembling property is also improved.

In the modification of the present invention, it is also possible to connect the oil hose by attaching the pipe to the engine case instead of the plate 37.
Depending on the characteristics of the model of the motorcycle 100, it can be changed to a water-cooled oil cooler. In this case, the plate 37 can be removed and the water-cooled oil cooler can be directly attached to the engine case.

Although the present invention has been described above with various embodiments, the present invention is not limited to these embodiments and can be modified within the scope of the present invention.
In the motorcycle 100 according to the present embodiment, the oil hose of the oil cooler 30 is arranged on the right side and the outlet side radiator hose 26 of the radiator 20 is arranged on the left side in the hose piping. On the contrary, the tank portion and each hose may be arranged.

10 Engine unit, 11 Crankcase, 12 Cylinder block, 13 Cylinder head, 14 Cylinder head cover, 15 Crankshaft, 16 Generator cover, 20 Radiator, 21 Fan, 22 Outlet side tank, 23 Inlet side tank, 24 Radiator cap , 25 water pump, 26 outlet side radiator hose, 27 cylinder inlet hose, 28 inlet side radiator hose, 29 bypass pipe, 30 oil cooler, 31 inlet side tank part, 32 outlet side tank part, 33 oil pan, 34 oil filter, 35 inlet side oil hose, 36 outlet side oil hose, 37 plate, 39,40 oil passage, 42,44 mounting part, 100 motorcycle.

Claims (4)

A cooling device for motorcycles in which the engine is mounted in a predetermined part of the body frame.
A radiator is placed on the upper side in front of the engine, and an air-cooled oil cooler is placed on the lower side.
The oil cooler has a substantially trapezoidal shape in which the lower side is shorter in the vehicle width direction than the upper side when viewed from the front of the vehicle.
A cowling that covers at least both sides of the engine and in which the radiator and the oil cooler are arranged is provided.
The oil cooler is provided by consolidating the tank portions on the inlet side and the outlet side on one side in the vehicle width direction and arranging them vertically.
The oil hoses on the inlet side and the outlet side connected to the tank portion and the engine are arranged unevenly on one side in the vehicle width direction in which the tank portion is arranged.
The connection destinations of the two oil hoses on the engine side are arranged unevenly on one side in the vehicle width direction and set on the front surface of the engine case, and the two oil hoses are aligned along the same plane when viewed from the front of the vehicle. by piping Te,
The connection destinations of the two oil hoses on the engine side are located at a height between the upper side and the lower side of the oil cooler in the front view of the vehicle, and are substantially the same as the outer end of the upper side of the oil cooler in the vehicle width direction. It should be located inside the position or the outer edge of the upper side of the oil cooler.
The oil cooler side connection destination of the oil hose on the outlet side is located below the oil cooler side connection destination of the oil hose on the inlet side and inside in the vehicle width direction.
A motorcycle cooling device characterized in that the engine side connection destination of the oil hose on the outlet side is located below the engine side connection destination of the oil hose on the inlet side . When viewed from the side of the vehicle, the two oil hoses are piped side by side in the vertical direction, and are arranged so as to pass by the side of the exhaust pipe from the engine side toward the oil cooler side. The motorcycle cooling device according to claim 1, wherein the distance between the two wheels is large. The cooling device for a motorcycle according to claim 1 or 2, wherein the engine side flanges of the two oil hoses are arranged adjacent to each other, and these flanges are tightened from the side surface of the vehicle. The motorcycle cooling device according to any one of claims 1 to 3, wherein the two oil hoses are attached to the engine case via a plate separate from the engine case.

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