JP6428346B2 - Engine cooling system - Google Patents

Description

  The present invention relates to an engine cooling apparatus.

  2. Description of the Related Art An engine cooling device is known that includes a radiator core that is convexly curved toward the back side and a pair of fans that are disposed on the back side of the radiator core (see, for example, Patent Document 1).

JP 2010-83349 A

  When a fan is disposed on the back surface of the curved radiator core, a gap is generated between the radiator core and the fan. Conventional engine cooling devices reduce the rotation radius of the fan to reduce the gap between the radiator core and the fan as much as possible to increase cooling efficiency, while compensating for the lack of cooling of the radiator core as the fan becomes smaller In addition, a plurality of, specifically, a pair of left and right fans are provided at each side end portion of the radiator core, and the power consumption, the weight, and the cost are increased as compared with the case where the radiator core is cooled by one fan. Has led to an increase.

  Accordingly, the present invention proposes an engine cooling apparatus that can reduce power consumption, weight, and cost by using a large fan.

In order to solve the above problems, an engine cooling apparatus according to the present invention includes a radiator core that is convexly curved toward the back side, and is disposed on the back side of the radiator core so as to be biased toward an end side of the radiator core, and A fan having a wider gap with the radiator core on the center side than on the end side of the radiator core, a fan stay that supports the fan, a center portion of the radiator core and the fan that are integrally formed with the fan stay, A shroud that covers the gap between the radiator core, the shroud is disposed closer to the center of the radiator core than the fan, and extends in a rectangle beyond the center of the radiator core. A first partition wall extending in a tangential direction of the outer diameter of the fan and extending along an upper end surface of the radiator core, and the shroud And is disposed parallel to the first partition wall, biased toward the lower end side of the radiator core from the center portion of the fan, and closer to the upper end side of the radiator core than the lower end portion of the fan. A second partition wall that is biased, and a third partition wall that extends in the vertical direction of the radiator core, is connected to the first partition wall and the second partition wall, and is disposed farthest from the fan. The first partition wall, the second partition wall, and the third partition wall define a margin of the shroud along the back surface of the radiator core, and a gap between the fan and a central portion of the radiator core. Is blocking .

  ADVANTAGE OF THE INVENTION According to this invention, the cooling device of the engine which can reduce power consumption, a weight, and expense using a large sized fan can be proposed.

1 is a left side view of a motorcycle to which an engine cooling device according to an embodiment is applied. The front view of the cooling device of the engine concerning this embodiment. The left view of the engine cooling device which concerns on this embodiment. The right view of the engine cooling device which concerns on this embodiment. The top view of the radiator of the cooling device concerning this embodiment. The rear view of the radiator of the cooling device concerning this embodiment. The left view of the radiator of the cooling device which concerns on this embodiment. The right view of the radiator of the cooling device which concerns on this embodiment.

  Embodiments of an engine cooling apparatus according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a left side view of a motorcycle to which an engine cooling device according to this embodiment is applied.

  In the present embodiment, front and rear, top and bottom, and left and right expressions are based on the occupant of the motorcycle 1.

  As shown in FIG. 1, a motorcycle 1 according to the present embodiment is disposed at a vehicle body frame 2 that extends in the front-rear direction of the vehicle, a front wheel 5 that is disposed in front of the vehicle body frame 2, and a front end portion of the vehicle body frame 2. A steering mechanism 6 that rotatably supports the front wheel 5, a rear wheel 7 that is disposed behind the vehicle body frame 2, a swing arm 8 that is disposed at the rear of the vehicle body frame 2 and rotatably supports the rear wheel 7, and a vehicle body frame And an engine 11 mounted on the vehicle 2.

  The motorcycle 1 includes a fuel tank 12 that is disposed above the front half of the vehicle body frame 2 and stores fuel supplied to the engine 11, and a seat that is disposed above the rear half of the vehicle body frame 2 and seats a passenger. 13 and a vehicle body cover 15 that covers a part of the vehicle body frame 2.

  The vehicle body frame 2 includes a pair of left and right main frames 21 that bear the front half of the vehicle body, and a rear frame 22 that bears the rear half of the vehicle body. The body frame 2 includes a head pipe 23 provided at the front end of the left and right main frames 21 and a pair of left and right center frames 25 extending downward from the rear ends of the left and right main frames 21.

  A plurality of, for example, three suspension brackets 26 a, 26 b, and 26 c are provided in a pair of left and right from the main frame 21 to the center frame 25. These suspension brackets 26a, 26b, and 26c suspend the engine 11.

  A pivot portion 27 is provided at the center of the center frame 25.

  The rear frame 22 includes a pair of left and right seat rails 28 and a pair of left and right side frames 29 that reinforce the seat rails 28. The seat rail 28 and the side frame 29 are tubular steel members.

  The seat rail 28 extends rearward and obliquely upward from the rear end portion of the main frame 21.

  The side frame 29 extends rearward and obliquely upward from the rear end of the upper end of the center frame 25 and joins and is joined to the seat rail 28.

  The steering mechanism 6 includes a steering shaft (not shown) rotatably disposed in the head pipe 23, an upper bracket 31 provided at the upper end portion of the steering shaft, an under bracket 32 provided at the lower end portion of the steering shaft, It has. The steering mechanism 6 includes a suspension mechanism (not shown), a pair of left and right front forks 33 that rotatably support the front wheel 5, a front fender (not shown) that covers the front wheel 5, and a front And a handle 36 connected to the top of the fork 33.

  The front fork 33 is fixed to the upper bracket 31 and the under bracket 32.

  The handle 36 is fixed to the upper bracket 31.

  The front wheel 5 is sandwiched between the left and right front forks 33 and rotates around an axle that is installed at the lower ends of the left and right front forks 33.

  The front end portion of the swing arm 8 is swingably supported by the pivot portion 27. An axle that rotatably supports the rear wheel 7 is provided at the rear end of the swing arm 8. A rear cushion unit 37 is installed between the body frame 2 and the swing arm 8. The rear cushion unit 37 is connected to the swing arm 8 via a link mechanism 38. The rear cushion unit 37 buffers the force transmitted from the rear wheel 7 to the vehicle body frame 2 and increases the grounding force of the rear wheel 7.

  The rear wheel 7 obtains driving force from the engine 11 via a drive chain (not shown) wound around the engine 11.

  The fuel tank 12 swells immediately after the head pipe 23 over the vicinity of the front end portion of the seat rail 28 and is supported by the main frame 21 exclusively.

  The seat 13 is disposed behind the fuel tank 12, straddles the left and right seat rails 28, and reaches the rear end of the seat rail 28.

  The vehicle body cover 15 includes a front cover 15a made of synthetic resin, a pair of left and right side covers 15b, and a rear cover 15c.

  The front cover 15 a covers the head pipe 23, the front end portion of the main frame 21, and a part of the engine 11 from the front of the handle 36.

  The side cover 15b is connected to the lower rear part of the fuel tank 12, spreads in an inverted triangle over the main frame 21, the seat rail 28, and the side frame 29, and is sandwiched from the left and right.

  The rear cover 15 c is connected to the lower end portions of the left and right side surfaces of the rear half of the seat 13 and extends rearward, and extends to the rear of the seat 13 and joins.

  Next, the engine cooling apparatus according to this embodiment will be described.

  FIG. 2 is a front view of the engine cooling device according to the present embodiment.

  FIG. 3 is a left side view of the engine cooling device according to the present embodiment.

  FIG. 4 is a right side view of the engine cooling device according to the present embodiment.

  As shown in FIGS. 2 to 4, the engine 11 according to the present embodiment is disposed below the cylinder block 41 and a cylinder block 41 and a cylinder head 42 that are inclined forward while being mounted on the vehicle body frame 2. A crankcase 43, a crankshaft 45 that is rotatably supported in the crankcase 43, and an oil filter 46 provided at the lower front portion of the crankcase 43 are provided.

  An exhaust pipe 48 is connected to the cylinder head 42. The exhaust pipe 48 passes through the front of the engine 11 and sinks below the engine 11.

  The cooling device 51 of the engine 11 includes a water pump 52 provided on the lower left side of the crankcase 43 and driven by the crankshaft 45, a radiator 53 disposed in front of the engine 11, and the water pump 52 to the cylinder A water supply hose 55 for guiding cooling water to a water jacket (not shown) of the block 41, a first return hose 56 for guiding cooling water heated by the water jacket to the radiator 53, and cooling water cooled by the radiator 53 And a second return hose 57 for guiding to the water pump 52.

  The cooling device 51 supplies the cooling water boosted by the water pump 52 from the water supply hose 55 to the water jacket to cool the cylinder block 41 and the cylinder head 42, and the heated cooling water from the first return hose 56 to the radiator 53. Then, the cooling water is cooled by the radiator 53 and led from the second return hose 57 to the water pump 52 to circulate the cooling water.

  The cooling device 51 includes an oil cooler 61 provided between the oil filter 46 and the crankcase 43, a second water supply hose 62 that supplies a part of the cooling water pressurized by the water pump 52 to the oil cooler 61, And a third return hose 63 for guiding the cooling water heated by the oil cooler 61 to the second return hose 57.

  A branch pipe 65 that connects the third return hose 63 is provided at the center of the second return hose 57.

  The radiator 53 is disposed in front of the cylinder block 41 and the cylinder head 42. An exhaust pipe 48 is sandwiched between the radiator 53 and the cylinder block 41 and the cylinder head 42.

  FIG. 5 is a plan view of the radiator of the cooling device according to the present embodiment.

  FIG. 6 is a rear view of the radiator of the cooling device according to the present embodiment.

  FIG. 7 is a left side view of the radiator of the cooling device according to the present embodiment.

  FIG. 8 is a right side view of the radiator of the cooling device according to the present embodiment.

  As shown in FIGS. 5 to 8 in addition to FIGS. 2 to 4, the radiator 53 of the cooling device 51 according to the present embodiment is disposed on the radiator core 71 that is convexly curved toward the back surface, and on the back surface of the radiator core 71. A fan 72 that is biased toward the end side of the radiator core 71 and that has a wider gap with the radiator core 71 on the center side than on the end side of the radiator core 71, a fan stay 73 that supports the fan 72, and a fan stay And a shroud 75 which is integrally formed with the radiator core 71 and covers the gap between the center of the radiator core 71 and the fan 72.

  The radiator 53 has a horizontally long rectangular shape. The introduction tank 76 is provided on one side of the radiator core 71, here the right side, and the other side of the radiator core 71, and the lead is provided on the left side here. And a tank 77. The arrangement of the introduction tank 76 and the outlet tank 77 may be reversed depending on the route of the hose (the first return hose 56 and the second return hose 57) on the engine 11 side.

  Further, the radiator 53 includes an electric motor 78 that rotates the fan 72 and a heat shield plate 79 that is integrally formed with the fan stay 73 and covers the electric motor.

  The radiator core 71 has a horizontally long rectangular shape that occupies most of the radiator 53, and has a straight vertical cross-sectional shape, while the horizontal cross-sectional shape is curved in a bow shape toward the back side. The curved shape of the radiator core 71 may be a substantially uniform curvature over the entire width, or may be a non-uniform curvature. Further, the curved shape of the radiator core 71 may be a mode in which it has a linear portion at each of the left and right end portions and is curved at the center portion. The radiator core 71 has a central portion that is convex toward the back side and is thus concave toward the front side, thereby allowing the front wheel 5 to be closer to the vehicle body side and contributing to shortening the wheel base of the motorcycle 1. ing.

  The radiator core 71 includes a plurality of tubes (not shown) that are arranged in the vertical direction and extend left and right, and a plurality of fins provided between adjacent tubes. The radiator core 71 cools the cooling water by exchanging heat between the cooling water flowing in one direction in the tube and the air passing through the radiator core 71 from the front side to the back side.

  A plate-like upper plate 81 and a lower plate 82 are provided on both upper and lower end surfaces of the radiator core 71. A pair of left and right mounting flanges 83 for the vehicle body frame 2 are provided at the left and right ends of the upper plate 81. A bracket 85 for fixing the shroud 75 is provided at the center of the upper plate 81. At the center of the lower plate 82, a mounting flange 87 to a support bracket 86 that is fixed to the crankcase 43 of the engine 11 and protrudes forward is provided.

  The introduction tank 76 guides relatively high-temperature cooling water discharged from the cylinder head 42 of the engine 11 to the radiator core 71. A cooling water inlet 88 connected to the first return hose 56 is provided on the back surface of the introduction tank 76.

  The lead-out tank 77 collects cooling water that passes through the radiator core 71 and has a relatively low temperature and sends it to the engine 11. A cooling water outlet 89 connected to the second return hose 57 is provided on the back surface of the outlet tank 77.

  The fan 72 is an axial flow type and is provided close to the back surface of the radiator core 71. The fan 72 is driven by the electric motor 78 to forcibly suck hot air from the radiator core 71 when the traveling wind is weak, such as when the vehicle is stopped or traveling at a low speed.

  Further, the fan 72 is disposed close to one end of the radiator core 71, in this embodiment, the right end, that is, the introduction tank 76 side, and a gap between the radiator core 71 and the fan 72 is provided. The radiator core 71 is arranged so as to open more widely on the center side of the radiator core 71 than on the end side of the radiator core 71. The fan 72 is disposed close to the upper end portion of the radiator core 71 in order to avoid interference with the exhaust pipe 48 connected to the engine 11. In other words, the fan 72 is arranged close to the back surface of the radiator core 71 and the corner portion at the upper right portion. When the introduction tank 76 is provided on the left side of the radiator core 71, the fan 72 is also preferably arranged close to the upper left corner.

  The fan 72 has a diameter that is large enough to reach the central portion from one end (here, the right end) of the radiator core 71, and is larger than a small fan of a conventional cooling device, and has a larger amount. Air can flow.

  The electric motor 78 is disposed concentrically with the fan 72 on the back side of the fan 72. The electric motor 78 is thin, and generates a sufficient driving force for the fan 72 while suppressing a projecting dimension from the back surface of the radiator core 71 to the engine 11 side.

  The fan stay 73 supports the fan 72 via an electric motor 78. The fan stay 73 includes an annular base 91 to which the electric motor 78 is fixed, and a plurality of legs 92 extending from the base 91. The fan stay 73 is made of resin, and the base portion 91 and the leg portion 92 are integrally molded.

  The base 91 has an outer diameter substantially the same as that of the electric motor 78. An electric motor 78 is screwed to the base 91.

  The leg portions 92 extend in three directions, and two of them (the leg portions 92a and 92b) reach the upper and lower portions of the introduction tank 76 provided on the side of the radiator core 71 and are fixed by screws. One (leg portion 92c) reaches the bracket 85 of the radiator core 71 and is fixed with screws. When the fan 72 is provided at the left end portion of the radiator core 71, the two leg portions 92 a and 92 b are fixed to the lead-out tank 77.

  In addition to the leg portion 92c, a reinforcing leg 92d is provided between the fan stay 73 and the shroud 75. The reinforcing leg 92d strengthens the connection between the fan stay 73 and the shroud 75 in cooperation with the leg portion 92c.

  The shroud 75 is integrally formed with the fan stay 73. The shroud 75 is fixed to the radiator core 71 via a fan stay 73.

  The shroud 75 is disposed closer to the center of the radiator core 71 than the fan 72.

  The shroud 75 extends in a rectangular shape beyond the center of the radiator core 71 to the side of the fan 72, here to the left. The shroud 75 extends along the fan 72 so as to be larger than the radius of the fan 72.

  The shroud 75 is adjacent to the left side of the fan 72 and has a side edge portion 95 along the outer diameter of the fan 72. The edge portion 95 is an edge of the rear wall 96 of the shroud 75 and connects the space in the shroud 75 to the fan 72.

  The shroud 75 has a first partition wall 97 along the upper end surface of the radiator core 71. The first partition wall 97 is the top surface of the shroud 75 and extends in the tangential direction of the outer diameter of the fan 72.

  Further, the shroud 75 has a second partition wall 98 disposed to face the first partition wall 97. The second partition wall 98 is the bottom surface of the shroud 75, is disposed in parallel to the first partition wall 97, and is biased toward the lower end side of the radiator core 71 with respect to the central portion of the fan 72.

  Furthermore, the shroud 75 has a third partition wall 99 disposed farthest from the fan 72. The third partition wall 99 extends in the vertical direction of the radiator core 71 and is connected to the back wall 96, the first partition wall 97, and the second partition wall 98.

  The first partition wall 97, the second partition wall 98, and the third partition wall 99 define the edge of the shroud 75 along the back surface of the radiator core 71 to block the gap between the fan 72 and the central portion of the radiator core 71. Yes.

  The integrally formed fan stay 73 and shroud 75 are open without blocking the downstream side of the fan 72.

  The heat shield plate 79 is provided behind the electric motor 78 with a gap therebetween, and shields heat from the engine 11 and the exhaust pipe 48.

  The cooling device 51 of the engine 11 according to the present embodiment configured as described above includes the shroud 75 that is integrally formed with the fan stay 73 and covers the gap between the center portion of the radiator core 71 and the fan 72, thereby providing the radiator core. The air heated by 71 is sucked from the front side to the back side of the radiator core 71, while the air sucked into the fan 72 through the gap between the radiator core 71 and the fan 72 is suppressed, and the radiator core 71 driven by the fan 72 is controlled. The cooling of the water, and hence the cooling water can be made more efficient.

  In addition, the cooling device 51 for the engine 11 according to the present embodiment includes a shroud 75 that is integrally formed with the fan stay 73 and covers the gap between the central portion of the radiator core 71 and the fan 72, so that the fan 72 with a larger diameter is provided. Can be used, and can contribute to efficient cooling with a small number of fans (for example, one) and cost reduction by reducing the number of parts.

  Further, the cooling device 51 of the engine 11 according to the present embodiment includes a shroud 75 that is integrally formed with the fan stay 73 and covers the gap between the center portion of the radiator core 71 and the fan 72, thereby moving the cooling device 51 to the downstream side of the fan 72. The air can be easily circulated, and the cooling efficiency of the radiator 53 when the fan 72 is not operated can be kept high without hindering the flow of the traveling wind of the motorcycle 1 by the shroud as in the conventional cooling device.

  Furthermore, since the cooling device 51 of the engine 11 according to the present embodiment includes the shroud 75 that is disposed closer to the center of the radiator core 71 than the fan 72, the gap between the radiator core 71 and the fan 72 is provided in the radiator. By concentrating on the central portion side of the core 71, the gap portion can be reliably closed by the shroud 75 that is sufficiently smaller than the area of the radiator core 71.

  Further, the cooling device 51 of the engine 11 according to the present embodiment includes the shroud having the edge portion 95 along the outer diameter of the fan 72, so that the air on the back side of the radiator core 71 is sucked into the fan 72. This can prevent the cooling efficiency.

  Furthermore, since the cooling device 51 of the engine 11 according to the present embodiment has partition walls (first partition wall 97, second partition wall 98, and third partition wall 99) along the back surface of the radiator core 71, the structure is simple. Thus, the air on the back side of the radiator core 71 can be prevented from being sucked into the fan 72, and the cooling efficiency can be improved.

  Furthermore, since the cooling device 51 of the engine 11 according to the present embodiment includes the shroud 75 that is larger than the radius of the fan 72, the range is wider than the outer diameter of the fan 72 at a low speed of the motorcycle 1. Cooling efficiency can be improved by circulating air from the front side to the back side of the radiator core 71.

  In addition, the cooling device 51 for the engine 11 according to the present embodiment includes a heat shield plate 79 that is integrally formed with the fan stay 73 and covers the electric motor 78, so that the electric motor 78 is protected from the heat of the engine 11 and the exhaust pipe 48. Thus, the motor 78 can be prevented from being damaged and the cooling performance can be prevented from deteriorating.

  Furthermore, since the cooling device 51 for the engine 11 according to the present embodiment includes the heat shield plate 79 that is integrally formed with the fan stay 73 and covers the electric motor 78, the electric motor 78 is brought closer to the engine 11 and the exhaust pipe 48. This contributes to shortening the wheelbase by increasing the flexibility of layout.

  Therefore, according to the cooling device 51 of the engine 11 according to the present embodiment, the power consumption, the weight, and the cost can be reduced using the large fan 72.

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 5 Front wheel 6 Steering mechanism 7 Rear wheel 8 Swing arm 11 Engine 12 Fuel tank 13 Seat 15 Body cover 15a Front cover 15b Side cover 15c Rear cover 21 Main frame 22 Rear frame 23 Head pipe 25 Center frames 26a, 26b 26c Suspension bracket 27 Pivot portion 28 Seat rail 29 Side frame 31 Upper bracket 32 Under bracket 33 Front fork 36 Handle 37 Rear cushion unit 38 Link mechanism 41 Cylinder block 42 Cylinder head 43 Crank case 45 Crankshaft 46 Oil filter 48 Exhaust pipe 51 Cooling device 52 Water pump 53 Radiator 55 Water supply hose 56 First return hose 57 Second return hose 1 Oil cooler 62 Second water supply hose 63 Third return hose 65 Branch pipe 71 Radiator core 72 Fan 73 Fan stay 75 Shroud 76 Introduction tank 77 Outlet tank 78 Electric motor 79 Heat shield plate 81 Upper plate 82 Lower plate 83 Mounting flange 85 Bracket 86 Support bracket 87 Mounting flange 88 Cooling water inlet 89 Cooling water outlet 91 Base 92, 92a, 92b, 92c Leg 92d Reinforcement leg 95 Edge 96 Back wall 97 First partition wall 98 Second partition wall 99 Third partition wall

Claims (4)

A radiator core that curves convexly toward the back side;
A fan disposed on the back surface of the radiator core, biased toward the end side of the radiator core, and having a wider gap with the radiator core on the center side than the end side of the radiator core;
A fan stay for supporting the fan;
And a shroud covering the gap between the fan and the center portion of the radiator core is integrally molded with the fan stay,
The shroud is disposed closer to the center of the radiator core than the fan, and extends in a rectangle beyond the center of the radiator core,
The shroud is
A first partition wall that is a top surface of the shroud, extends in a tangential direction of an outer diameter of the fan, and extends along an upper end surface of the radiator core;
A bottom surface of the shroud, disposed parallel to the first partition wall, biased to a lower end side of the radiator core from a center portion of the fan, and an upper end of the radiator core from a lower end portion of the fan A second partition wall biased to the side;
A third partition wall extending in the vertical direction of the radiator core, connected to the first partition wall and the second partition wall, and disposed farthest from the fan;
The first partition wall, the second partition wall, and the third partition wall define an edge of the shroud along the back surface of the radiator core to close a gap between the fan and the center portion of the radiator core. cooling apparatus of the stomach Ru engine. The engine cooling device according to claim 1, wherein the shroud has a peripheral edge portion along an outer diameter of the fan. The shroud cooling system for an engine according to claim 1 or 2 have spread larger than the radius of the fan along the fan. An electric motor for rotating the fan;
The engine cooling device according to any one of claims 1 to 3 , further comprising a heat shield plate integrally formed with the fan stay and covering the electric motor.

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