JP2005193731A - Radiator intake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiator intake device capable of ensuring the sufficient amount of cooling wind, without clogging a radiator with dust sucked with the cooling wind and adhered to a screen. <P>SOLUTION: An intake device 14 disposed on an intake side of the radiator 4 for cooling an engine through which the cooling wind passes from an upper side to a lower side, comprises an intake port 143 opening to a lower side or a slanting lower side; an intake duct body 141 forming an inducing passage 143 leading the cooling wind a sucked from the intake port 142 to a front surface 41a of the radiator 4; and the screen 144 provided on the intake port 142 and removing dust. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a radiator suction device in a vertical liquid-cooled engine mounted on a work vehicle such as a lawn mower.

2. Description of the Related Art Conventionally, a radiator suction device in a vertical liquid-cooled engine mounted on a work vehicle such as a lawn mower is usually arranged with external air (cooling air) sucked by a cooling fan horizontally above the engine. Further, a screen made of, for example, a metal mesh is horizontally arranged directly above (on the suction side) the radiator. In such a radiator suction device, before passing the cooling air sucked by the cooling fan between the fins of the radiator, the cooling air is passed through the screen, and after removing dust and turf debris sucked together with the cooling air, It is made to go to the suction side (for example, refer patent document 1).
Japanese Patent Publication No. 4-15391

  However, according to the radiator suction device, since the screen is horizontally disposed directly above the radiator, dust such as turf dust sucked together with the cooling air adheres to and accumulates on the upper surface side of the screen. However, the vibration of the engine and the wind pressure at the time of intake of cooling air may pass through the screen mesh and fall to the front of the radiator and enter between the fins of the radiator, causing clogging. Also, the dust remaining on the upper surface of the screen remains worsening the flow of cooling air. Therefore, conventionally, the screen has to be frequently cleaned, and maintenance has been required.

  Therefore, an object of the present invention is to provide a radiator suction device that can effectively prevent the radiator from being clogged by dust such as turf dust that is sucked together with cooling air and adheres to the screen.

  In order to achieve the above object, a radiator suction device according to the present invention is a suction device disposed on the suction side of a radiator for cooling an engine through which cooling air is passed from the upper side to the lower side. And a suction duct body that forms an introduction passage that guides the cooling air sucked from the suction port to the front surface of the radiator, and a screen that is provided at the suction port to remove dust. ing.

  According to this configuration, the cooling air is not directly passed from the upper front surface of the radiator as in the prior art, but is sucked from the suction port provided in the suction duct body that opens downward or obliquely downward, and enters the introduction passage. Turned and passed through the radiator from the front of the radiator. At this time, since the screen for removing dust is provided at the suction port, the dust contained in the cooling air adheres to the lower surface of the screen, not the upper surface of the screen. Dust adhering to the lower surface of the screen falls downward due to engine vibration when the engine is driven, and spontaneously falls and discharges when the engine is stopped. This prevents dust from continuing to adhere to the lower surface of the screen and hindering the flow of cooling air. There is no. The dust that has fallen off the screen is blocked by the suction duct body and does not enter the introduction passage in the suction duct body, so that the gap between the fins of the radiator is not clogged by the dust. Therefore, it is possible to secure a sufficient amount of cooling air and maintain a high heat dissipation performance of the radiator. Further, since dust does not adhere to and accumulate on the lower surface of the screen and the radiator is not clogged with dust, maintenance of the screen and the radiator is unnecessary or easy.

  In a preferred embodiment of the present invention, the suction duct body is formed in a trumpet shape whose passage area increases downward, and is disposed above the radiator to introduce cooling air to the front surface of the radiator; An inlet duct is formed between the inner duct and the inner duct so as to cover the upper side of the inner duct and introduce cooling air flowing from the inlet into the inlet of the inner duct.

  According to this configuration, the duct body constituted by the inner duct and the outer duct has a substantially cross-sectional shape of a mushroom so that the radiator front surface is covered with the inner duct, and the suction port provided with the screen is further disposed outside the duct. As a cover for waterproofing, even if the engine or work vehicle equipped with the radiator inhaler is left outdoors, the screen and the radiator are not exposed to rain or night dew and are not likely to get wet. Therefore, even if the dust adheres to the screen or the radiator, the dust does not get wet and does not stick, so that the clogging does not occur. In addition, the passage area of the inner duct is reduced toward the upper inlet, and the upper part of the inlet of the inner duct is covered with the outer duct, so that engine noise and cooling air intake sound leak to the outside. It is difficult and can prevent noise.

  In a preferred embodiment of the present invention, a seal surface that is pressed against the upper surfaces of the water tanks at both ends of the radiator is formed in the lower portion of the inner duct.

  According to this configuration, dust can be prevented from entering the front surface of the radiator from the lower portion of the inner duct.

  In a preferred embodiment of the present invention, the suction device of the present invention is disposed above the engine body of a vertical liquid-cooled engine having a crankshaft disposed in the vertical direction.

  According to this configuration, since the inhaler is disposed above the engine body, the plane size of the engine is not increased. Therefore, it becomes easy to store this inhaler in a vehicle having a restriction in plane dimensions such as a lawn mower.

  According to the radiator inhaler of the present invention, it is possible to secure a sufficient amount of cooling air to the radiator by suppressing clogging of the radiator and the screen due to dust, and there is almost no need to clean the screen or the radiator, which is advantageous in terms of maintenance. It is.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a vertical-axis liquid-cooled two-cylinder engine to which a radiator inhaler according to the present invention is applied. In the vertical-type liquid-cooled two-cylinder engine shown in the figure, a crankshaft 2 extending in the vertical direction V is supported on a crankcase 1 of an engine body E, and two V-shaped cylinders 3 and a cylinder head 31 are seen in plan view. An engine cooling radiator 4 that is disposed on the front side of the main body E and through which cooling air is passed in the vertical direction is disposed above the engine main body E. The crankshaft 2 is not limited to the vertical direction, and may be slightly inclined from the vertical direction. Below the radiator 4, a fan duct 5 and a cooling fan 6 (FIG. 2) housed in the fan duct 5 are arranged. An air cleaner 7 is disposed in front of the engine main body E outside the fan duct 5 in the radial direction, and a filter element 72 is housed inside the cover 71. The radiator 4 includes a core 41 having a water pipe and fins, and a pair of water tanks 43A and 43B connected to the water pipe. The radiator 4 includes an introduction pipe 41 (FIG. 2) for introducing warmed cooling water after engine cooling into the radiator 4 through the introduction-side water tank 43A, and heat radiation from the cooling water in the radiator 4. An outlet pipe 42 is connected to the engine main body E side from the outlet side water tank 43B.

  The engine body E includes a crankcase 1, a cylinder 3, a cylinder head 31, and a rocker cover 32. The upper half 1a of the crankcase 1 and the cylinder 3 are integrally formed as an engine case EC. The lower half 1b of the crankcase 1 is integrally formed with the engine base EB, and the engine base EB is connected to the lower part of the engine case EC.

  As shown in FIG. 2, the cooling fan 6 is attached to a flywheel 21 fixed to the crankshaft 2 via a pulley 22. The fan duct 5 is opened up and down to form an internal space for housing the cooling fan 6 and the pulley 21, and is attached to the engine body E via a bracket 8 at an outer peripheral attachment portion 50. The mounting portion 40 of the radiator 4 is superposed on the duct mounting portion 50 via the damper 45, and the screw body 82 is screwed into the welding nut 81 fixed to the bracket 8 from above, so that the fan duct 5 and the radiator 4 are connected. It is fixed to the bracket 8 by tightening together. The mounting portions 50 and 40 are provided at the four corners of the fan duct 5 and the radiator 4.

  As shown in FIG. 4, the fan duct 5 is formed with a circular internal space for accommodating the cooling fan 6 (FIG. 1) in the central portion thereof, and the cooling fan 6 (FIG. 1) A front air outlet 51 for discharging the exhaust air from the front is provided, a side air outlet 52 for exhausting the exhaust air obliquely forward is provided at both sides, and a rear air outlet is provided at the rear. 54 is provided. The side air outlet 52 is provided with a louver 53 so as to forcibly exhaust the exhaust air obliquely forward. In addition, a pair of left and right standing walls 58 are provided on the upper portion of the fan duct 5. Such a fan duct 5 is molded with a resin material such as polypropylene, for example, and has a mold release direction in a vertical direction V and an oblique forward direction U which is a wind guide direction of the louver 53. The shape of the louver 53 is set so as to be molded by the mold.

  As shown in FIG. 2, a ring-shaped guide body 18 is fitted inside the fan duct 5, and the guide body 18 covers at least the upstream side of the outer periphery of the cooling fan 6. The guide body 18 is held between the radiator 4 and the mounting portions 40 and 50 of the fan duct 5 and held by the fan duct 5. The chip clearance formed by the guide body 18 and the cooling fan 6 is set to be small so as to improve the cooling performance.

  Below the air cleaner 7 in front of the engine main body E, a fuel supply device 10 such as a carburetor or a fuel injection device is disposed, and the air cleaner 7 and the fuel supply device 10 are connected by an intake pipe 11. The fuel supply device 10 is connected to the intake manifold 12 via an insulator 13. The fuel supply device 10 and the intake pipe 11 are provided with two intake passages connected to two cylinders.

  The inhaler 14 according to the first embodiment of the present invention is arranged on the inhalation side of the radiator 4, and external air is sucked as cooling air through the inhaler 14. The planar shape of the inhaler 14 is substantially the same as the planar shape of the horizontally long radiator 4 as shown in FIG. The suction device 14 has a suction opening 142 that has a downward opening shown in FIG. 2 and a suction duct body 141 that has an introduction passage 143 that guides cooling air from the suction opening 142 to the front surface of the radiator 4, that is, the front surface 41 a of the core 41. And a screen 144 (FIG. 2) provided at the suction port 142 for removing dust. The suction port 142 communicates with the front surface of the radiator 4 only through the introduction passage 143 inside the suction duct body 141. The screen 144 is formed of, for example, a wire mesh, and is disposed horizontally, and is fixed to the inner peripheral surface of the suction port 142 with an adhesive 24 as shown in FIG.

  The suction duct body 141 has an inner duct 141a and an outer duct 141b. The inner duct 141a has a mushroom shape when viewed from the side, is formed in a trumpet shape whose passage area increases downward, and is disposed above the radiator 4 to introduce cooling air into the front surface of the radiator 4. To do. The outer duct 141b covers the upper side of the inner duct 141a to form the suction port 142 with the inner duct 141a, and the cooling air a flowing upward from the suction port 142 enters the inlet 145 of the inner duct 141a. It has come to introduce.

  When viewed from above, the outer duct 141b is formed in a rectangular shape as shown in FIG. 6, and its inner side forms a dome-shaped space as shown in FIG. The horizontal width M1 and the front-rear width M2 in FIG. 6 are substantially the same as the dimensions of the radiator 4, and are set to dimensions that cover the entire core 41 of the radiator 4 and part of the water tanks 43A and 43B when viewed in plan. . On the other hand, when viewed from the lower surface side, the inner duct 141a is formed with an elliptical opening 141aa serving as an inlet at its central portion as shown in FIG. 7, and the outer appearance thereof is the core 41 of the radiator 4 (FIG. 5). ) Substantially match the planar shape, and three attachment portions 141ab are provided on both the front and rear sides. Each of the inner and outer ducts 141a and 141b is a resin molded product.

  When the screen 144 is viewed in plan, as shown in FIG. 8, an elliptical opening 144a having a shape similar to the opening 141aa of the inner duct 141a (FIG. 7) and slightly larger than this is formed at the center thereof. The wire mesh 144e is supported by molding on a resin-made screen support frame having inner and outer peripheral frames 144b and 144bc and radial ribs 144d connecting between the frames 144b and 144bc. The metal mesh 144e is reinforced by the ribs 144d and the frames 144b and 144c, so that the tensioned state is maintained without bending during use, and the screen effect does not deteriorate. The screen 144 is fitted between the outer peripheral surface of the upper end portion of the inner duct 141a in FIG. 5 and the inner peripheral surface of the lower end portion of the outer duct 141b.

  In this way, the suction device 14 in which the inner duct 141a, the outer duct 141b, and the screen 144 are assembled together has three attachment portions 141ab provided on the front and rear sides of the inner duct 141a shown in FIG. The radiator 4 is detachably attached to the radiator 4 by fastening with screw bodies 45 at three screw holes provided in the water tanks 43A and 43B of the radiator 4 shown. In this case, as shown in FIG. 5, seal surfaces 25 are formed on both the front and rear sides of the lower portion of the inner duct 141a so as to be in pressure contact with the upper surfaces of the water tanks 43A and 43B at the front and rear portions of the radiator 4.

  As shown in FIG. 9, cover pieces 141ac are integrally formed on the left and right sides of the lower portion of the inner duct 141a so as to overlap the outer surfaces of the pair of left and right standing walls 58 of the fan duct 5. The seal portion 25 and the cover piece 141ac (FIG. 9) in FIG. 5 prevent a gap from being formed between the inner duct 141a and the radiator 4. On the other hand, there is no hole in the peripheral wall forming the main part of the introduction passage 143 in the suction duct 141. Therefore, the air outside the suction duct 141 is taken as cooling air a into the radiator 4 through the introduction passage 143 in the suction duct 141 only from the suction port 142.

  In the above configuration, air outside the intake duct 141 is taken in as cooling air a for engine cooling by the cooling fan 6 shown in FIG. At this time, the cooling air a passes through the screen 144 of the suction port 142 from below, and dust such as turf dust is removed by the screen 144, and then the dome of the outer duct 141b, which is the upstream portion of the introduction passage 143. Flows into the space. Subsequently, the cooling air a is turned and led from the inlet 141aa of the inner duct 141a to the inner space of the inner duct 141a, which is the downstream portion of the introduction passage 143, and then the core 41 of the radiator 4 has its front surface ( It enters from the upper surface 41a and passes between the fins of the radiator 4 to dissipate the engine coolant.

  Dust contained in the cooling air a sucked from the suction port 142 of the suction duct 141 adheres to the lower surface side of the screen 144 provided in the downward suction port 142. The dust adhering to the lower surface side of the screen 144 falls downward due to the vibration when the engine is driven, and drops downward due to its own weight because the suction effect is lost when the engine is stopped. Since the front surface (upper surface) 41a of the radiator 4 is covered with the inner duct 141a, the dust that has dropped down is blocked by the inner duct 141a and does not adhere to the front surface 41a of the radiator 4, so that the inner duct 141a It is discharged through the outer wall. Thus, since dust does not enter the radiator 4 through the introduction passage 143, the radiator 4 is not clogged by dust. Therefore, a sufficient air volume of the cooling air a can be secured to maintain high thermal performance.

  The suction duct body 141 composed of the inner duct 141a and the outer duct 141b has a substantially mushroom-like vertical cross section so as to cover the front surface of the radiator 4, and the outer duct 141b is provided with a suction port 142 provided with a screen 144. Therefore, even if the engine or work vehicle equipped with the suction device 14 of the radiator 4 is left outdoors, the screen 144 and the radiator 4 are not exposed to rain or night dew and get wet. Therefore, even if dust adheres to the screen 144 or the radiator 4, the dust does not get wet and does not stick, so that there is no major clogging. Further, the inner duct 141a has a reduced passage area toward the upper inlet 141aa, and the upper portion of the inlet 141aa is covered with the outer duct 141b, so that engine noise and cooling air intake sound leak to the outside. It becomes difficult and noise is suppressed.

  In addition to the screen 144, when another secondary screen 145 finer than the screen 144 is provided inside the lower portion of the inner duct 141a as shown by a two-dot chain line in FIG. Even if there is fine dust that has passed through the screen 144, it can be captured and removed by the secondary screen 145, so that the clogging of the radiator 4 by dust can be more effectively suppressed. The screen 145 is also fixed to, for example, an adhesive 24 at a contact portion with the lower inner side of the inner duct 141a.

  FIG. 10 shows a radiator inhaler 14A according to the second embodiment. In the inhaler 14A, the inhaler 14 according to the first embodiment of FIG. 1 is formed by combining the inner duct 141a and the outer duct 141b in a mushroom shape, and the intake duct body 241 in FIG. Is formed of an inner duct 241a that covers the upper surface and the side surface of the outer peripheral portion of the flat rectangular radiator 4, and an outer duct 241b that covers the upper and outer periphery and forms an introduction passage 243 with the inner duct 241a. Yes. As shown in FIG. 11, the outer duct 241 b has a lateral width L <b> 1 and a front-rear width L <b> 2 that greatly exceed the dimensions of the radiator 4. As in the first embodiment, a screen 244 is attached to the suction port 242 formed between the inner duct 241a and the outer duct 241b by an adhesive 24.

  The attachment structure of the suction duct body 241 to the radiator 4 is as follows. Screw holes 46 are provided at the four corners of the radiator 4, that is, at both ends of the front and rear water tanks 43A and 43B, and insertion holes are provided at positions corresponding to the screw holes 46 in the inner and outer ducts 241a and 241b. The collar 47 is interposed between the opposing insertion holes, and the bolt 48 is inserted into the insertion hole and the collar 47 and screwed into the screw hole 46. In the case of the second embodiment, the water injection port 28 provided in the outlet side water tank 43B of the radiator 4 is exposed upward from the suction duct body 241 to facilitate water injection. The pipe 29 whose tip is the water injection port 28 is protruded upward from the insertion hole 30 of FIG. 11 provided in the outer duct 241a. The gap between the insertion hole 30 and the pipe 29 is caulked so that airtightness does not deteriorate.

  According to the radiator inhaler 14A of the second embodiment, the dust adhering to the screen 244 in FIG. 10 does not accumulate and may enter between the fins of the radiator 4 and become clogged, as in the first embodiment. Therefore, a sufficient air volume of the cooling air a can be secured, and the heat dissipation performance of the radiator 4 can be maintained high. Further, since the height in the vertical direction of the inhaler 14A can be kept low, it becomes easy to mount the engine on a vehicle in which the vertical dimension of the engine storage space is restricted.

  In each of the embodiments described above, the suction ports 142 and 242 face downward. However, as shown by a two-dot chain line 142A in FIG. 1, the suction ports 142 and 242 may face obliquely downward, so that the screen is also inclined obliquely downward. Therefore, the adhered dust is discharged to the outside by engine vibration or natural fall.

  The radiator suction device of the present invention is most suitable for a vertical liquid cooling engine disposed on the suction side of an engine cooling radiator through which cooling air is passed in the vertical direction. Even an engine other than the engine can be applied in the same manner as long as the radiator is horizontally disposed and the cooling air is passed in the vertical direction, and the same effect as that of the above-described embodiment can be obtained.

It is a side view of a vertical axis type liquid cooling engine to which a radiator inhaler according to an embodiment of the present invention is applied. It is a longitudinal cross-sectional view which shows the internal structure of the engine. It is a top view of the engine. It is a perspective view of the fan duct of the engine. It is a longitudinal cross-sectional view which shows an inhaler. It is a top view of an outside duct. It is a bottom view of an inner duct. It is a top view of a screen. It is a longitudinal cross-sectional view which shows the positional relationship of an inhaler and a fan duct. It is a longitudinal cross-sectional view of the inhalation device concerning a 2nd embodiment of the present invention. It is a top view of the inhaler.

Explanation of symbols

14, 14A Suction device 141, 241 Suction duct body 141a, 241a Inner duct 141b, 241b Outer duct 142, 242 Suction port 143, 243 Inlet passage 144, 244 Screen a Cooling air

Claims (4)

An intake device disposed on the intake side of an engine cooling radiator through which cooling air is passed from above to below,
A suction duct body that forms a suction passage that opens downward or obliquely downward, and an introduction passage that guides the cooling air sucked from the suction port to the front surface of the radiator;
A screen provided at the inlet for removing dust;
Radiator inhalation device comprising: The suction duct body according to claim 1,
An inner duct which is formed in a trumpet shape whose passage area increases downward and is arranged above the radiator to introduce cooling air into the front surface of the radiator;
An intake device for a radiator which has an outer duct which covers the upper side of the inner duct and forms the suction port with the inner duct and introduces cooling air flowing from the suction port into the inlet of the inner duct. .   3. The radiator inhaler according to claim 2, wherein a seal surface that is pressed against the upper surfaces of the water tanks at both ends of the radiator is formed at a lower portion of the inner duct.   The radiator inhaler according to claim 2 or 3, wherein the intake device is disposed above an engine body of a vertical liquid cooling engine in which a crankshaft is arranged in a vertical direction.

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