JP2007309170A - Cooling structure for working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling structure for a working vehicle having a shroud mounted on a radiator cooling an engine and having a cooling fan arranged to face to a ventilation opening formed on the shroud and supplying cooling air to the radiator by rotation of the air cooling fan, capable of securing sufficient heat radiation quantity by radiator without causing complication of work during assembly. <P>SOLUTION: In this cooling structure for a working structure, a bearing body is installed and fixed on a center axis of a ventilation opening of the shroud via a stay crossing a cooling air passage, and the air cooling fan is rotatably supported on the bearing body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention provides a cooling system for a working vehicle in which a shroud is attached to a radiator for cooling an engine, an air cooling fan is disposed facing a ventilation opening formed in the shroud, and cooling air is supplied to the radiator by rotation of the air cooling fan. Concerning structure.

    A forklift (forklift truck) A which is an embodiment of the work vehicle shown in FIG. 12 includes a vehicle body B and a work machine W installed in front of the vehicle body B. Inside the vehicle body M, an engine E and a radiator are provided. Equipment such as R is installed.

  In the forklift A, the engine E is floatingly supported on the vehicle body B via a vibration isolating member such as a rubber mount for the purpose of improving vibration and noise during operation.

  Here, in order to improve the cooling efficiency in the radiator, a cooling system (cooling structure) for concentrating the cooling air by attaching a shroud to the radiator has been conventionally provided (for example, Patent Document 1 and Patent Document 2). And Patent Document 3).

  In the cooling system shown in FIGS. 12 and 13, the radiator R is installed in the vehicle body B on the rear side of the engine E, the shroud S having the ventilation opening So is attached in front of the radiator R, and the air cooling supported by the engine E is performed. The fan F faces the ventilation opening So of the shroud S.

  Further, in the cooling system shown in FIG. 14, the radiator R is supported on the rear side of the engine E via the connecting member H, and the shroud S having the ventilation opening So is attached to the front of the radiator R and supported by the engine E. The air-cooling fan F faces the ventilation opening So of the shroud S.

In any of the above-described cooling systems, the outside air sucked from the front and lower side of the vehicle body B by the operating air cooling fan F is introduced into the shroud S as cooling air from the intake opening So and guided to the shroud S. Since it concentrates and goes to the radiator R, the said radiator R will be cooled efficiently.
JP 58-174114 A Japanese Utility Model Publication No. 5-5538 Japanese Utility Model Publication No. 5-78927

    In the cooling system shown in FIG. 13, the engine E and the radiator R are separately installed with respect to the vehicle body B. Therefore, the air cooling fan F supported by the engine E and the air flow in the shroud S are used. Between the opening So, a gap for avoiding a collision between the two, in detail, relative movement between the shroud S and the air cooling fan F due to vibration during operation, and the mounting position of the shroud S and the air cooling fan F It is necessary to set a large gap to allow “variation”.

  As described above, since the conventional cooling system shown in FIG. 13 requires a large gap between the ventilation opening So of the shroud S and the air cooling fan F, the cooling air is supplied to the shroud S by the air cooling fan F. The efficiency is reduced, and the amount of heat radiation (cooling heat amount) in the radiator R is reduced. To compensate for this reduction, the operation speed of the air-cooling fan F is increased, for example, noise increases, and so on. There was a problem that caused inconvenience.

  On the other hand, in the cooling system shown in FIG. 14, the radiator R is supported by the engine E via the connecting member H, so that relative movement between the shroud S and the air cooling fan F due to vibration during operation is suppressed. Since the gap between the ventilation opening So of the shroud S and the air cooling fan F is small, the efficiency of supplying cooling air to the shroud S by the air cooling fan F is not inadvertently lowered.

  As described above, in the conventional cooling system shown in FIG. 14, since the gap between the ventilation opening So and the air cooling fan F can be small, a sufficient amount of heat radiation in the radiator R can be secured, but the engine E has a radiator. Since it is necessary to firmly support R, the connecting member H has a complicated structure and a large size, which not only increases the installation space, but also aligns the engine E and the radiator R during assembly. Specifically, there is a problem that a complicated operation is required for the alignment (centering) of the ventilation opening So of the shroud S and the air cooling fan F.

  In view of the above circumstances, an object of the present invention is to provide a cooling structure for a working vehicle that can secure a sufficient heat dissipation amount in a radiator without causing complication of work during assembly.

    In order to achieve the above object, a cooling structure for a working vehicle according to claim 1 is provided with a shroud attached to a radiator for cooling an engine, an air cooling fan is disposed facing a ventilation opening formed in the shroud, and the air cooling fan. A cooling structure for a working vehicle that supplies cooling air to the radiator by rotation of the support shaft, wherein a support shaft body is fixedly installed on a central axis of a vent opening in the shroud via a stay crossing the cooling air passage, It is characterized in that an air cooling fan is rotatably supported on the body.

  According to a second aspect of the present invention, there is provided a work vehicle cooling structure according to the first aspect, wherein the shroud is a radiator shroud installed in the radiator and an air cooling fan is supported. A fan-side shroud is provided, and the radiator-side shroud and the air-cooled fan-side shroud are assembled to each other via a seal member in a manner that allows mutual displacement and prevents cooling air from leaking from the cooling air passage. It is characterized by

  According to a third aspect of the present invention, there is provided a cooling structure for a working vehicle, wherein the cooling structure for the working vehicle according to the first aspect of the invention is supplied to a stay across the cooling air passage of the shroud by rotation of an air cooling fan. It features a rectifier plate that rectifies the cooling air.

    In the cooling structure of the working vehicle according to the first aspect of the present invention, the air cooling fan is rotatably supported on the support shaft body fixed to the shroud via the stay, so that the space between the shroud ventilation opening and the air cooling fan is provided. There is no center axis misalignment.

  For this reason, when assembling the cooling structure, alignment (centering) of the shroud vent opening and the air cooling fan F is not required, so that the work at the time of assembling the cooling structure becomes extremely easy. Since the gap between the ventilation opening and the air cooling fan can be set as small as possible, the supply efficiency of the cooling air by the air cooling fan to the radiator is improved, so that a sufficient heat radiation amount in the radiator can be ensured.

  According to the cooling structure of the working vehicle related to the invention of claim 2, the radiator and the air cooling fan are combined with the radiator side shroud and the air cooling fan side shroud through the seal member in addition to the function and effect of claim 1. Therefore, it is possible to suppress the complication of work during assembly as much as possible.

  According to the cooling structure of the working vehicle related to the invention of claim 3, the cooling air rectified by the rectifying plate attached to the stay is smoothly supplied to the radiator together with the function and effect of claim 1. The cooling efficiency in the radiator can be greatly improved.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
FIG. 1 shows an example in which the present invention is applied to a forklift that is an embodiment of a working vehicle. The forklift 1 includes a vehicle body 2 and a work machine 3 mounted in front of the vehicle body 2. .

  An engine 4 and a radiator 5 are mounted inside the vehicle body 2. The engine 4 is floatingly supported in a substantially central region of the vehicle body 2 via a vibration isolation member such as a rubber mount. The vehicle body 2 is installed in a rear region with respect to the engine 4 through appropriate vibration isolation means.

  An air cooling fan 6 is disposed in the rear area with respect to the engine 4, and a shroud 7 is provided in the front area with respect to the radiator 5 to guide the cooling air from the air cooling fan 6 while concentrating on the radiator 5. The forklift 1 cooling system (cooling structure) is constructed by the engine 4, the radiator 5, the air cooling fan 6, the shroud 7, and the like.

  2 to 4, the shroud 7 includes a radiator-side shroud 10 fixedly installed on the front side of the radiator 5 (left side in FIG. 5), and the front side of the radiator-side shroud 10 (in FIG. 2). And an air cooling fan side shroud 20 assembled on the left side), and a weather strip 30 as a seal member to be described later is interposed between the radiator side shroud 10 and the air cooling fan side shroud 20. Has been.

  Incidentally, the radiator side shroud 10 and the air cooling fan side shroud 20 are both made of a resin material having flame retardancy such as polypropylene.

  As shown in FIG. 5, the radiator side shroud 10 has a rectangular box shape released from the front surface of the radiator 5, and a large-diameter opening 11 o is formed in the central area of the front plate 11. Brackets 11b and 11c used for mounting on the radiator 5 are formed on the left and right edges of the rear.

  Here, the radiator-side shroud 10 is installed on the vehicle body 2 via the radiator 5 by being fixedly installed on the front surface of the radiator 5 as shown in FIG.

  On the other hand, as shown in FIGS. 6 to 9, the air-cooling fan side shroud 20 includes a duct 21 having a cylindrical shape, and a front side (left side in FIG. 7) of the duct 21 is viewed from the front. A ventilation opening 21o that forms a perfect circle when viewed is formed, and a weather strip (seal member) 30 is formed around the entire periphery of the edge 21e of the duct 21 on the back side (right side in FIG. 7). It is installed.

  Here, the air-cooling fan-side shroud 20 is assembled to the radiator-side shroud 10 so as to face the opening 11o of the front plate 11 and with the weather strip (seal member) 30 pressed against the front plate 11. The radiator shroud 10 and the internal space of the air cooling fan shroud 20 constitute a cooling air passage extending from the vent opening 21 o to the front of the radiator 5.

  The duct 21 in the air cooling fan shroud 20 is provided with a shaft (support shaft body) 22 for supporting the air cooling fan 6 in a manner to be described later on the central axis (oo) of the ventilation opening 21o in the duct 21. It has been.

  Four stays 23, 23... Extending in the radial direction across the cooling air passage are attached to the inner peripheral surface of the duct 21, and the shaft (support shaft body) 22 is connected to the four stays 23. , 23... Are fixedly installed on the center hub 24 supported.

  Further, the four stays 23, 23,... That support the center hub 24 (shaft 22) have a predetermined rectification for rectifying the cooling air supplied to the radiator 5 by the operation of the air cooling fan 6, as will be described in detail later. Rectifying plates 25, 25,... Each having a blade cross-sectional shape are fixed using mounting bolts 23B.

  The air cooling fan 6 disposed facing the ventilation opening 21o of the duct 21 is provided with a bearing 6B installed between the shaft 22 and a boss 6b provided with fan blades 6r, 6r. The shaft 22 is rotatably supported with respect to the air-cooling fan side shroud 20.

  A driven pulley 6P is fixed to the front side (left side in FIG. 7) of the boss 6b of the air cooling fan 6 as shown in FIGS. A fan shaft (not shown) rotatably supported by the bracket 40 is provided on the front side (left side in FIG. 7) of the boss 6b in the air cooling fan 6. The air cooling fan 6 is fixed on the same axis as the shaft 22 of the side shroud 20, so that the air cooling fan 6 is supported on the rear portion of the engine 4 via the bracket 40 and a fan shaft (not shown).

  In other words, the air cooling fan-side shroud 20 that is a component of the shroud 7 is supported by the rear portion of the engine 4 via the air cooling fan 6 and the bracket 40 described above.

  Further, as shown in FIG. 2, the driven pulley 6P fixed to the air cooling fan 6 and the drive pulley 4P attached to the output shaft 4A of the engine 4 are connected to each other via a transmission belt 4V. The air cooling fan 6 is driven and rotated by the operation of the engine 4.

  In the cooling system having the above-described configuration, the outside air sucked from the front and lower sides of the vehicle body 2 by the operating air cooling fan 6 is introduced from the ventilation opening 21o of the air cooling fan side shroud 20 in the shroud 7 and then the air cooling fan side. The radiator 5 is guided to the duct 21 of the shroud 20 and the radiator side shroud 10 and is directed to the radiator 5 as cooling air, whereby the radiator 5 is efficiently cooled.

  Here, in the cooling system having the above-described configuration, the shaft 22 is fixedly installed on the central axis (oo) via the stays 23, 23, in the duct 21 of the air cooling fan side shroud 20 constituting the shroud 7. Since the air cooling fan 6 is rotatably supported on the shaft 22, there is no “center misalignment” between the ventilation opening 21 o of the duct 21 and the air cooling fan 6.

  That is, in the cooling system configured as described above, the alignment (centering) between the ventilation opening 21o of the shroud 7 and the air cooling fan 6 is not required, so that the work at the time of assembling the cooling structure is extremely easy. Can do.

  In the cooling system having the above-described configuration, the air cooling fan 6 is rotatably supported on the shaft 22 of the shroud 7, so that the air cooling fan 6 and the shroud 7 move relative to each other due to vibration during operation of the forklift 1. There is nothing.

  For this reason, the clearance gap between the ventilation opening 21o of the shroud 7 and the air cooling fan 6 can be set as small as possible, thereby improving the supply efficiency of the cooling air to the radiator 5 by the air cooling fan 6, and thus sufficient in the radiator 5 It is possible to ensure a sufficient amount of heat dissipation.

  Here, when the gap between the air cooling fan 6 and the ventilation opening 21o is reduced by about 50% with respect to the conventional structure, the amount of cooling air supplied to the radiator 5 is increased by about 10%, and the cooling in the radiator 5 is performed. In order to improve the efficiency, it is possible to reduce noise, improve fuel consumption, etc. by reducing the rotational speed of the air cooling fan 6.

  Further, in the cooling system having the above configuration, since the weather strip 30 is interposed between the radiator side shroud 10 and the air cooling fan side shroud 20 constituting the shroud 7, the weather strip 30 causes a slight misalignment between the two. Therefore, it is not necessary to precisely position the radiator 5 to which the radiator shroud 10 is attached and the engine 4 supporting the air cooling fan shroud 20 via the air cooling fan 6, thereby assembling the cooling structure. Work at the time becomes easy.

  Further, since the weather strip 30 as a seal member is interposed between the radiator side shroud 10 and the air cooling fan side shroud 20, the leakage of cooling air from the cooling air passage formed by the internal spaces of both of them is prevented. Thus, the cooling air supply efficiency to the radiator 5 by the air cooling fan 6 is not lowered, so that a sufficient heat radiation amount in the radiator 5 is ensured.

  Further, in the cooling system having the above-described configuration, the cooling efficiency in the radiator 5 is improved by attaching the rectifying plate 25 for rectifying the cooling air to the stay 23 of the air-cooling fan side shroud 20 constituting the shroud 7 as described above. It will greatly improve.

  That is, as shown in FIG. 10, when the air cooling fan 6 is driven to rotate, the cooling air flows diagonally backward as indicated by the arrow h by the fan blade 6 r moving in the arrow Q direction, but downstream of the air cooling fan 6. By being guided by the rectifying plate 25 provided on the side (downward in the figure), it flows in a direction facing the front surface of the radiator 5 (upper surface in the figure) as indicated by an arrow i.

  As a result, the cooling air is supplied to the radiator 5 (specifically, the radiator core) from the direction facing the front surface (upper surface in the drawing) as indicated by the arrow j, so that the cooling air is supplied to the radiator 5. The efficiency is improved, and the cooling efficiency of the radiator 5 is greatly improved.

  Here, in the embodiment described above, the heat of the radiator 5 is directed from the front to the rear of the vehicle by the air cooling fan 6 installed on the front side of the radiator 5 (between the engine 4 and the radiator 5) as shown in FIG. Although an extruding type cooling system has been shown, an air cooling fan 6 'is arranged behind the radiator 5' as shown in FIG. 11, and the cooling system of the type that sucks the heat of the radiator 5 'from the front toward the rear of the vehicle, The present invention can be effectively applied.

  That is, in the cooling system shown in FIG. 11, a shroud 7 '(radiator-side shroud 10', air-cooling fan-side shroud 20 'is placed behind a radiator 5' installed in a vehicle body (not shown) as in the engine 4 '. The weather strip 30 ') is attached, and the air cooling fan 6 disposed behind the shroud 7' is driven by the power from the output shaft 4A 'of the engine 4'.

  The cooling system shown in FIG. 11 is basically the same as the cooling system shown in FIGS. 1 to 10 except that the layout of the radiator 5 ′, the air cooling fan 6 ′ and the shroud 7 ′ is reversed. Components having the same function are denoted by the same reference numerals as those in FIGS. 1 to 10 and a description thereof is omitted.

  In the cooling system of FIG. 11, the heat of the radiator 5 'is forward (left side in the figure) by the air cooling fan 6' disposed facing the ventilation opening 21o 'of the shroud 7' (air cooling fan side shroud 20 '). Is sucked out from the back.

  It goes without saying that the present invention can be applied to the cooling system having the above-described configuration extremely effectively for the purpose of simplifying the work during assembly and ensuring a sufficient amount of heat radiation in the radiator.

  In the cooling system in each of the above-described embodiments, the air cooling fan is rotated by power from the output shaft of the engine. However, the air cooling fan is separately driven by a drive source such as an electric motor or a hydraulic motor installed on the vehicle body. It can also be configured to drive.

  In each of the above-described embodiments, an example in which the present invention is applied to a cooling structure for a forklift that is an aspect of a working vehicle has been described. However, a shroud is attached to a radiator that cools an engine, and an air vent formed on the shroud is formed. As long as the working vehicle adopts a cooling structure in which an air cooling fan is arranged facing the opening and the cooling air is supplied to the radiator by the rotation of the air cooling fan, the present invention is effective in various working vehicles other than forklifts. Of course, it is applicable to.

The conceptual diagram which shows the layout of an engine, a radiator, etc. in the work vehicle to which the cooling structure concerning this invention is applied. FIG. 2 is an external side view showing an embodiment of a cooling structure in the work vehicle shown in FIG. 1. FIG. 2 is an external plan view showing the cooling structure shown in FIG. 1. The external appearance front view which shows the cooling structure shown in FIG. (a) And (b) is the whole top view and whole front view which show the radiator side shroud. The whole front view which showed the air-cooling fan side shroud in the state by which the air-cooling fan is supported. VII-VII sectional view taken on the line in FIG. The whole rear view which showed the air-cooling fan side shroud in the state by which the air-cooling fan is supported. (a) And (b) is the IXa-IXa sectional view taken on the line in FIG. 8, and the IXb-IXb sectional view taken on the line in FIG. The conceptual diagram which shows the rectification | straightening effect | action by the baffle plate of an air-cooling fan side shroud. The principal part side view which shows notionally the other Example of the cooling structure in connection with this invention. The whole side view which shows notionally the layout of an engine, a radiator, etc. in the conventional work vehicle. The conceptual diagram of the cooling structure in the working vehicle shown in FIG. The conceptual diagram which shows the other cooling structure in the conventional working vehicle.

Explanation of symbols

1 ... Forklift (work vehicle),
2 ... the car body,
4 ... Engine,
4a ... drive shaft,
4d ... Drive pulley,
5 ... Radiator,
6 ... Air cooling fan,
6b ... Boss
6r ... Fan wing,
7 ... shroud,
10 ... radiator side shroud,
11 ... Front plate,
11o ... opening,
20 ... Air cooling fan side shroud,
21 ... Duct,
21o ... Ventilation opening,
22 ... shaft (support shaft body),
23 ... Stay,
24 ... Center hub,
25 ... Rectifying plate,
30 ... Weather strip (seal member),
40 ... Bracket.

Claims (3)

A working vehicle cooling structure in which a shroud is attached to a radiator that cools an engine, an air cooling fan is disposed facing a ventilation opening formed in the shroud, and cooling air is supplied to the radiator by rotation of the air cooling fan. ,
A support shaft body is fixedly installed on a central axis of the vent opening in the shroud via a stay crossing a cooling air passage, and the air cooling fan is rotatably supported on the support shaft body. Cooling structure for working vehicle. The shroud includes a radiator side shroud installed on the radiator and an air cooling fan side shroud on which the air cooling fan is supported, and the radiator side shroud and the air cooling fan side shroud are allowed to be displaced from each other. 2. The cooling structure for a working vehicle according to claim 1, wherein the cooling structure is assembled to each other via a seal member in a manner to prevent leakage of cooling air from the cooling air passage. 2. The cooling structure for a working vehicle according to claim 1, wherein a rectifying plate for rectifying cooling air supplied to the radiator by rotation of the air cooling fan is attached to the stay crossing the cooling air passage of the shroud. .

Images