JP2010064706A - Cooling device for motorcycle engine and motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a sufficient bank angle by reducing a vehicle frontal projected area, and to efficiently arrange a pipe of a cooling device. <P>SOLUTION: In a motorcycle where an engine unit 10 is mounted at a predetermined position of a vehicle body frame 101, a radiator 20 is disposed at an upper side in a front part of the engine unit 10, and an air-cooled oil cooler 30 is disposed at a lower side. The air-cooled oil cooler 30 is formed into a rough trapezoid of which the lower side is shorter than the upper side in a vehicle width direction viewed from a vehicle front face, and the radiator 20 is also formed into a rough trapezoid of which the lower side is shorter than the upper side in the vehicle width direction viewed from the vehicle front face. Besides, a radiator hose 26 on an outlet side of the radiator 20 is disposed on a side opposite to a side where oil hoses 35, 36 of the oil cooler 30 are disposed. Thereby, the vehicle frontal projected area can be reduced to secure the sufficient bank angle, and to efficiently arrange the pipe of the cooling device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cooling apparatus for a motorcycle engine including a radiator and an oil cooler, and a motorcycle including the same.

  In large motorcycles and the like, air-cooled oil coolers are sometimes used in combination with radiators in water-cooled engines. In this case, in many cases, a so-called drone cup type oil cooler is arranged below the radiator arranged in front of the engine, and the oil hose is taken out from the left and right. FIG. 6 is a view showing the arrangement of a cooling device including such a conventional radiator and oil cooler. FIG. 6 shows a state in which a drone cup type oil cooler 602 is disposed below the radiator 601 disposed in front of the engine, and the side cowl 603 covers the side. As a similar configuration, there is one disclosed in Patent Document 1 in which radiators are provided vertically.

JP 2005-271849 A

  However, when the arrangement of the cooling device including the radiator and the oil cooler is as described above, the following problems are raised.

  The drone cup type oil cooler has a substantially rectangular shape when viewed from the front of the vehicle. Therefore, when this is arranged on the lower side of the radiator, if the vehicle shape in the vicinity of the front surface of the engine is squeezed to reduce the diameter downward, the side of the oil cooler becomes an obstacle. Therefore, the vehicle front projection area is increased and the bank angle cannot be sufficiently secured. An increase in the projected area on the front of the vehicle leads to an increase in air resistance, and securing the bank angle is an important factor in smooth cornering, so it is an important problem to be solved especially in sports-type large motorcycles. is there.

  On the other hand, in order to reduce the area of the drone cup type oil cooler, reduce the front projected area of the vehicle, and secure the bank angle, the vehicle shape on the front of the engine is squeezed to reduce the diameter downward. The sufficient amount of heat radiation cannot be ensured and the cooling performance will be hindered.

  In addition, the drone cup type oil cooler basically has left and right outlets for the hose. Therefore, the hose piping from the oil inlet / outlet of the engine becomes long, and piping including the cooling water hose of the radiator cannot be efficiently performed. Moreover, since the taking-out port of the drone cup type oil cooler can be made only in the vertical direction, a space in the vertical direction is required, and there is a case where a large oil cooler that can secure a desired heat radiation amount cannot be arranged.

  The present invention has been made in view of the above circumstances, and is a motorcycle that can reduce a vehicle front projection area, ensure a sufficient bank angle, and can efficiently perform piping of a cooling device. The purpose is to provide an engine cooling device.

The motorcycle engine cooling device according to the present invention is a motorcycle engine cooling device for cooling an engine mounted on a predetermined part of a vehicle body frame, wherein the engine is cooled on the upper side in front of the engine. A radiator is disposed, and an air-cooled oil cooler is disposed on the lower side, and the air-cooled 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. Features.
In another aspect of the cooling device for a motorcycle engine of the present invention, the radiator has a substantially trapezoidal shape in which the lower side is shorter in the vehicle width direction than the upper side in a front view of the vehicle, and the lower side is the oil cooler. It is characterized by having substantially the same width as the upper side of.
In another aspect of the motorcycle engine cooling device of the present invention, the engine includes a cowling that covers at least both sides of the engine and in which the radiator and the oil cooler are disposed in an inner space thereof. To do.
Further, in another aspect of the cooling device for a motorcycle engine of the present invention, the oil cooler is provided with an inlet side and an outlet side tank portion integrated on one side in the vehicle width direction and arranged in parallel vertically. The oil hose on the inlet side and the outlet side connected to the tank part and the engine is arranged to be biased to one side in the vehicle width direction where the tank part is arranged.
Further, in another aspect of the cooling device for a motorcycle engine of the present invention, the radiator is a cross flow type having an inlet side tank portion on one side in the vehicle width direction and an outlet side tank portion on the other side. In addition, the outlet side tank portion of the radiator is disposed on the vehicle width direction side opposite to that of the oil hose.
Further, in another aspect of the cooling device for a motorcycle engine of the present invention, an outlet side radiator hose connected to the outlet side tank portion of the radiator and a water pump provided in the engine, the water pump and the A cooling water supply hose connected to a water jacket of the engine is disposed on the same side in the vehicle width direction as the outlet side tank portion of the radiator is disposed.
Further, in another aspect of the motorcycle engine cooling device of the present invention, the cooling water supply hose extends from the water pump toward the front of the engine, and is formed in a cylinder block of the engine. It is characterized by being connected to the water jacket on the front side of the vehicle.
In another aspect of the motorcycle engine cooling device of the present invention, at least a part of the outlet-side radiator hose and the cooling water supply hose are overlapped with the oil hose in a side view of the vehicle. Features.
A motorcycle according to the present invention includes the above-described cooling device for a motorcycle engine.

  According to the present invention, it is possible to reduce the vehicle front projection area, ensure a sufficient bank angle, and efficiently perform piping of the cooling device.

  A preferred embodiment of a “motorcycle cooling device for a motorcycle” according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an overall configuration of a motorcycle 100 including a “motorcycle 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 drawing, the front of the vehicle is indicated by an arrow Fr and the rear is indicated by an arrow Rr.

  In FIG. 1, two left and right front forks 103 supported by a steering head pipe 102 so as to be pivotable to the left and right are provided at the front part of a pair of left and right body frames 101 made of steel or aluminum alloy material. The pair of left and right vehicle body frames 101 are coupled in front of the vehicle, and a steering head pipe 102 is provided at the coupling portion, and the steering center is disposed here. A handle bar 104 is fixed to the upper end of the front fork 103, and the handle bar 104 has grips 105 at both ends thereof. A front wheel 106 is rotatably supported at the lower portion of the front fork 103, and a front fender 107 is fixed so as to cover the upper portion 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 from the steering head pipe 102 in a bifurcated left and right direction, and each of them extends while being inclined downwardly. 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 swing arm 109 and the swing arm 109. 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 that covers the vicinity of the front upper portion is provided in the immediate vicinity of the rear wheel 111, and a rear fender 115 is disposed above.

  The air-fuel mixture is supplied from the fuel injection device 116 to the engine unit 10 (one-dot chain line portion) mounted at a predetermined portion of the vehicle body frame 101, and exhaust gas after combustion in the engine passes through the exhaust pipe 117. 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 to the lower side of the engine unit 10 and then 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 121 </ b> A and tandem seats 121 </ b> B) are connected to the rear of the fuel tank 120. Footrests 122A and 122B are disposed below the rider seat 121A and the tandem seat 121B, respectively. In this example, on the left side of the vehicle, a prop stand 123 is provided at a substantially central lower portion in the front-rear direction. Note that a fuel injection device 116 is disposed in the inner recess of the fuel tank 120 and is positioned above the engine unit 10 and accommodated compactly.

  Various accessory devices are provided in front of the handle bar 104. For example, the headlamp 124 is provided in a fairing 128 to be described later in the forefront of the vehicle body, and the meter unit 125 including a speedometer, a tachometer, or various indicator lamps is provided in the handlebar 104 in the space covered with the fairing 128. It is provided in front of. A rearview mirror 126 is provided on the top of the fairing 128 via a stay 127.

  Further, in the vehicle exterior, the front part and the side part of the vehicle are mainly covered by the fairing 128 and the side cowl 129 which are cowlings, and the side cover 130 or the seat cowl 131 is attached to the rear part of the vehicle. An appearance form of a vehicle having a streamlined shape is formed. Among these, an air inlet 132 for supplying air to an air cleaner (not shown) constituting a part of the fuel injection device 116 is opened at the front end portion of the fairing 128.

  Next, the configuration around the engine unit 10 in the present embodiment will be described with reference to FIGS. 2 is a perspective view of the periphery of the engine unit 10 as viewed from the right front, FIG. 3 is a left side view of the periphery of the engine unit 10 as viewed from the left, and FIG. 4 is a front view of the periphery of the engine unit 10 as viewed from the front. It is. In these figures, the front is indicated by an arrow Fr, the rear is indicated by an arrow Rr, the right is indicated by an arrow R, and the left is indicated by an arrow L, respectively.

  The engine unit 10 is supported by being moderately tilted forward so as to be sandwiched between the pair of left and right body frames 101, and is disposed below the fuel tank 120 in the lower center of the vehicle body of the motorcycle 100. In the engine unit 10, a cylinder block (not shown) integrally provided with a plurality of cylinders (cylinders) is disposed in the vehicle body width direction in a slightly forwardly inclined state on the upper part of the crankcase 12. In this example, for example, there may be four cylinders, but this is a side cam chain type parallel multi-cylinder engine in which each cylinder shaft is mounted with a slight forward tilt from the vertical. The cylinder block is molded by aluminum die casting integrally with (a part of) the crankcase 12.

  The engine unit 10 is attached or mounted with accessory devices such as an intake device, an exhaust device, and a cooling device, and auxiliary equipment. As the intake device, the air purified by the air cleaner 11 disposed in front of the fuel tank 120 (FIG. 1) is supplied to the intake port. The amount of air supplied to the intake port is controlled by a throttle valve. The intake port is supplied with fuel from the fuel tank 120 by an injector constituting a part of the fuel injection device 116.

  As the exhaust device, an exhaust pipe 117 (having four or six exhaust pipes in this example) is connected to the front side of the cylinder block described above, and a muffler 119 is connected to the downstream side thereof. As the cooling device, a radiator 20 and an oil cooler 30 are disposed in front of the engine unit 10. The radiator 20 and the oil cooler 30 are disposed 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, hereinafter, 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.

  First, cooling water cooling of the engine unit 10 by the radiator 20 will be described. In the cylinder block 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 disposed in front of the cylinder block of the engine unit 10 and has a substantially trapezoidal shape with a lower side shorter than an upper side in a front view of the vehicle as shown in FIG.

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

  Here, the circulation flow of the cooling water will be described in detail. The water pump 25 is installed obliquely below and behind the generator cover 14 that covers the crankshaft 13 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 pressure-feeds the cooling water introduced by the impeller provided therein to the water jacket in the cylinder block via the cylinder inlet hose (cooling water supply hose) 27. The cylinder inlet hose 27 is disposed near the water pump 25 on the same vehicle width direction side as the outlet side radiator hose 26, extends from the water pump 25 toward the front of the vehicle along the outlet side radiator hose 26, and the engine unit 10. Is curved upward along the outer shape of the cylinder block and coupled to the front side of the cylinder block, precisely to the gate (not shown) formed near the cylinder head, and cooled to a water jacket formed in the cylinder block. Inflow of water.

  And the cooling water which went around the inside of a water jacket and cooled the circumference | surroundings of a cylinder and a cylinder head (not shown) is discharged from the gate formed in the vehicle rear surface side of the cylinder head. Here, the gate is provided with a thermostat, and the discharge direction is controlled in accordance with the temperature of the cooling water. When the cooling water is below a certain temperature, the cooling water flows into the water pump 25 through the bypass pipe 29 extending from the gate to the water pump 25, and is again pumped to the water jacket via the cylinder inlet hose 27. . 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.

  The cooling water is thus cooled in a timely manner and circulates so as to cool the inside of the cylinder block and the cylinder head. The driving source for circulating the cooling water is the water pump 25, but the water pump 25 is driven by the power transmitted from the engine unit 10. Specifically, the water pump 25 rotates by receiving rotational power from a counter shaft (not shown) that receives rotational power from the crankshaft 13 that is driven by starting the engine unit 10, and pumps cooling water. I am doing so.

  Next, lubricating oil cooling by the oil cooler 30 will be described. In the engine unit 10, lubrication cooled by the oil cooler 30 is performed on the peripheral portion of the crankshaft 13 (specifically, a journal bearing, a crankpin bearing, etc.), a transmission, and a valve operating device in the cylinder head. Oil is supplied. The oil cooler 30 is disposed in front of the engine unit 10 and below the radiator 20. As shown in FIG. 4, the oil cooler 30 has a substantially trapezoidal shape with a lower side shorter than the upper side in the front view of the vehicle. It has the shape of Further, the upper side of the oil cooler 30 has substantially the same width as the lower side of the radiator 20, and the radiator 20 and the oil cooler 30 are arranged so that the side surfaces thereof are continuous in the vertical direction when viewed from the front of the vehicle.

  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 two-pass type corrugated fin & tube system, and collects an inlet side tank part 31 and an outlet side tank part 32 arranged vertically on the right side. Have. In addition, the inlet side tank part 31 and the outlet side tank part 32 are partitioned off at the position of the line L shown in FIG.

  Lubricating oil stored in an 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 by an oil pump (not shown) and is pumped to the inlet side tank unit 31. Thereafter, the lubricating oil is pumped to the outlet side tank portion 32 disposed on the lower side through a tube having a plurality of zigzag fins (corrugated fins) joined thereto. The cooled lubricating oil is supplied from the outlet side tank portion 32 to the peripheral portion of the crankshaft 13 of the engine unit 10 and the like. The oil pan 33 is attached to the lower portion of the crankcase 12 and has a shape that bulges downward on the right side of the vehicle center in the vehicle width direction (see FIG. 4 and the like). When the oil pan 33 bulges, a recess is formed on the left side, and a collective portion 117 'of a plurality of exhaust pipes 117 are arranged in the recess.

  Here, the circulation flow of the lubricating oil will be described in detail. Lubricating oil stored in the oil pan 33 is first sucked out via a strainer (not shown) by an oil pump (not shown) installed on the upper side of the oil pan 33, and the oil disposed in front of the oil pan 33. It is pumped to the filter 34. The oil filter 34 removes foreign substances contained in the pressure-fitted lubricating oil and cleans it. Thereafter, the lubricating oil flows into the inlet side tank portion 31 of the oil cooler 30 through the inlet side oil hose 35 extending from the right side surface portion of the crankcase 12.

  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 passes through the outlet-side oil hose 36 that extends to the right side surface portion of the crankcase 12. Is sent to the main gallery in the engine unit 10 and supplied to each part of the engine unit 10 such as the peripheral part of the crankshaft 13.

  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. The oil pump is driven by power transmitted from the engine unit 10. Specifically, 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. That is, the oil pump rotates by receiving rotational power from a counter shaft (not shown) to which rotational power is transmitted from a crankshaft 13 that is driven by starting the engine unit 10, and pumps lubricating oil. ing.

  The motorcycle 100 according to the present embodiment has been described above. Below, the arrangement structure of the radiator 20 and the oil cooler 30 according to the present embodiment will be summarized, and the advantages of the arrangement structure will be described.

First, as described above, in the present embodiment, the radiator 20 and the oil cooler 30 have a substantially trapezoidal shape whose lower side is shorter than the upper side thereof, the radiator 20 is arranged on the upper side, and the oil cooler 30 is placed on the lower side thereof. Is arranged. In this case, since the oil cooler 30 has a substantially trapezoidal shape in which the lower side is shorter than the upper side when viewed from the front of the vehicle, the overhang in the vehicle width direction can be suppressed. Can be secured greatly, and the turning performance can be improved because the load clearance can be sufficiently secured.
In particular, by arranging the oil cooler 30 below the radiator 20 so as to have a substantially trapezoidal shape, the vehicle width of the portion near the ground contact surface of the front wheel 106 can be suppressed, so that the bank angle can be further increased. The motorcycle 100 according to the present embodiment has a configuration in which both sides of the vehicle are covered with the side cowl 129, but the oil cooler 30 is substantially trapezoidal and is disposed below the radiator 20 so that the side cowl 129 can also be made slim, and the front projected area of the vehicle can be reduced and a large bank angle can be secured in the same manner as described above.
Here, FIG. 5 is a schematic view of the cooling device according to the present embodiment as viewed from the front of the vehicle. As shown in FIG. 5A, by arranging the oil cooler 30 in a substantially trapezoidal shape and placing it below the radiator, the side cowl 129 can be reduced by the area of S1 (shaded portion), and the front of the vehicle The projected area can be reduced, and the bank angle can be secured large by α. In this figure, the reduction of the vehicle front projection area and the securing of the bank angle are described based on the case where the oil cooler is compared with the conventional drone cup type (see FIG. 6).

  In addition, since the radiator 20 has a substantially trapezoidal shape in which the lower side is shorter than the upper side when viewed from the front of the vehicle, the overhang in the vehicle width direction can be suppressed, so that the vehicle front projected area can be further reduced. Furthermore, the upper side of the oil cooler 30 and the lower side of the radiator 20 have substantially the same width, and the radiator 20 and the oil cooler 30 are arranged in such a manner that the side profile thereof is continuous in the vertical direction when viewed from the front of the vehicle. You can create shapes. That is, as shown in FIG. 5 (B), the side cowl 129 can be reduced by the area of S2 (shaded portion), the vehicle front projection area can be reduced, and the cowling shape with a streamlined styling and Will be able to.

  In the present embodiment, the oil cooler 30 adopts a so-called two-pass type corrugated fin & tube system, and is arranged on the right side (one side) of the inlet side tank unit 31 and the outlet side. The tank portion 32 is integrated. Thus, by integrating the inlet side tank part 31 and the outlet side tank part 32 of the oil cooler 30 on one side, it is possible to secure a heat radiation area compared to the case where these tanks are separately arranged on the left and right sides (particularly, Therefore, the cooling performance can be sufficiently secured. Further, the inlet side tank portion 31 and the outlet side tank portion 32 are gathered on one side, and the inlet side oil hose 35 and the outlet side oil hose 36 extending from these are also biased from the tank portions 31 and 32 to one side. Since the oil passage structure connected to the engine unit 10 can be made simple (linear) by extending the hose, the processability of the hose is improved, the hose length is shortened, the vehicle Weight reduction is possible.

  In the present embodiment, the outlet side radiator hose 35 of the radiator 20 is extended along with the extension of the inlet side oil hose 35 and the outlet side oil hose 36 (hereinafter referred to as oil hose) from the oil cooler 30 to one side. 26 is extended to the opposite side to the oil hose. Generally, since the outlet side radiator hose 26 is connected to a lower portion of the outlet side tank portion 22 of the radiator, there is a possibility of interference with the oil hose, so that the arrangement space is limited. For this reason, as the oil hose of the oil cooler 30 extends to one side, the outlet side radiator hose 26 of the radiator 20 extends on the opposite side (the other side) to the oil hose. Can be avoided, and as a result, the overhang of the vehicle width can be further suppressed.

  Further, in the present embodiment, the outlet side radiator hose 26 and the cylinder inlet hose 27 of the radiator 20 are provided on the same vehicle width direction side in the vehicle width direction, and are collectively arranged on the side opposite to the oil hose of the oil cooler 30. I have to. And at least one part of the outlet side radiator hose 26 and the cylinder inlet hose 27 overlaps with an oil hose in the vehicle side view. In such a configuration, the outlet side radiator hose 26 and the cylinder inlet hose 27 and the oil hose which are positioned at a lower position can avoid interference with each other, and as a result, the overhang of the vehicle width can be further suppressed. .

  Further, in the present embodiment, the cylinder inlet hose 27 extends forward of the engine unit 10 and is connected to the water jacket in the cylinder block of the engine unit 10 on the vehicle front side. Thus, the cylinder block and the exhaust side portion of the cylinder head that are particularly hot can be preferentially cooled, so that an efficient cooling effect can be obtained.

Further, in the present embodiment, the oil pan 33 is attached to the lower portion of the crankcase 12 and has a shape that bulges downward downward on the right side of the vehicle center in the vehicle width direction. On the left side of the oil pan 33, a collective portion 117 'of a plurality of exhaust pipes 117 are arranged. That is, the oil pan 33 has a shape that bulges to the right of the vehicle center in the vehicle width direction, in other words, on the oil hose side of the oil cooler 30, so that the oil pan 33 bulges downward. A recess is relatively formed in the oil pan 33 on the opposite side of the hose, and a collective portion 117 ′ of a plurality of exhaust pipes 117 are arranged in the recess.
In the present embodiment, as shown in FIG. 3, the oil hose of the oil cooler 30 is positioned lower than the outlet side radiator hose 26 in the space in front of the crankcase 12. In such a configuration, by arranging the collecting portion 117 ′ of the exhaust pipe 117 on the side opposite to the oil hose, interference between the oil hose and the collecting portion 117 ′ can be avoided, and the oil hose can be piped with good space efficiency. In general, the engine oil is higher than the cooling water in the engine operating state, and the engine oil needs to be cooled as much as possible. Therefore, the oil hose needs to be separated from the exhaust pipe. Therefore, disposing the collecting portion 117 ′ of the exhaust pipe 117 on the side opposite to the oil hose has an advantage that the oil hose can be moved away from the exhaust pipe 117 that is a heat source.

  In the motorcycle 100 according to the present embodiment, in the piping of the hoses, 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. On the contrary, a tank part and each hose may be arranged.

1 is a diagram showing an overall configuration of a motorcycle having a cooling device arrangement structure according to the present invention. FIG. 2 is a perspective view of a motorcycle equipped with a cooling device arrangement structure according to the present invention as viewed from the right front side around an engine unit. FIG. 4 is a left side view of the motorcycle unit having the cooling device arrangement structure according to the present invention as viewed from the left. FIG. 2 is a front view of a motorcycle around the engine unit provided with the cooling device arrangement structure according to the present invention as viewed from the front. FIG. 2 is a schematic view of the cooling device of the motorcycle having the cooling device arrangement structure according to the present invention as viewed from the front of the vehicle. It is the schematic diagram which looked at the cooling device of the conventional motorcycle from the vehicle front.

Explanation of symbols

  10 Engine unit, 11 Air cleaner, 12 Crankcase, 13 Crankshaft, 14 Generator cover, 20 Radiator, 21 Fan, 22 Outlet side tank, 23 Inlet side tank, 24 Cooling water reservoir tank, 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, 32 Outlet side tank, 33 Oil pan, 34 Oil filter, 35 Inlet side oil hose, 36 Outlet side oil hose, 100 motorcycle, 101 body frame, 102 steering head pipe, 103 front fork, 104 handlebar, 105 grip, 106 front wheel, 107 front fender, 108 brake disc, 109 swing arm, 110 rear shock absorber, 111 rear wheel, 112 chain, 113 driven sprocket, 114 inner fender, 115 rear fender, 116 fuel injection device, 117 exhaust pipe, 117 'assembly , 118 exhaust chamber, 119 muffler, 120 fuel tank, 121 seat, 121A rider seat, 121B tandem seat, 122A footrest, 122B footrest, 123 prop stand, 124 headlamp, 125 meter unit, 126 rearview mirror, 127 stay, 128 Fairing, 129 Side cowl, 130 Side cover, 131 Seat cowl, 132 Air intake.

Claims (9)

In a motorcycle in which an engine is mounted on a predetermined part of a vehicle body frame, a motorcycle engine cooling device for cooling the engine,
A radiator is disposed on the upper side in front of the engine, and an air-cooled oil cooler is disposed on the lower side.
A cooling device for a motorcycle engine, wherein the air-cooled oil cooler has a substantially trapezoidal shape with a lower side shorter than an upper side in a vehicle width direction when viewed from the front of the vehicle.   2. The radiator according to claim 1, wherein the radiator has a substantially trapezoidal shape in which the lower side is shorter in the vehicle width direction than the upper side in a front view of the vehicle, and the lower side is substantially the same width as the upper side of the oil cooler. For cooling motorcycle engines in Japanese vehicles.   The cooling device for a motorcycle engine according to claim 1 or 2, further comprising a cowling that covers at least both sides of the engine and in which the radiator and the oil cooler are disposed. The oil cooler is provided with an inlet side and an outlet side tank unit on one side in the vehicle width direction and arranged in parallel vertically.
2. The inlet-side and outlet-side oil hoses connected to the tank part and the engine are arranged to be biased to one side in the vehicle width direction in which the tank part is arranged. The cooling device of the engine for motorcycles of any one of -3. The radiator is a cross flow type having an inlet side tank portion on one side in the vehicle width direction and an outlet side tank portion on the other side,
The cooling device for a motorcycle engine according to claim 4, wherein the outlet side tank portion of the radiator is disposed on a vehicle width direction side opposite to the oil hose.   An outlet-side radiator hose connected to the outlet-side tank portion of the radiator and a water pump provided in the engine; and a cooling water supply hose connected to the water pump and a water jacket of the engine. 6. The cooling device for a motorcycle engine according to claim 5, wherein the cooling unit is disposed on the same vehicle width direction side as the outlet side tank portion of the motorcycle.   The cooling water supply hose extends from the water pump toward the front of the engine, and is connected to a water jacket formed in a cylinder block of the engine on the front side of the vehicle. Item 7. The cooling device for a motorcycle engine according to Item 6.   The motorcycle engine cooling device according to claim 7, wherein at least a part of the outlet side radiator hose and the cooling water supply hose are overlapped with the oil hose in a side view of the vehicle.   A motorcycle comprising the cooling device for a motorcycle engine according to any one of claims 1 to 8.

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