JP2010242731A - Cooling system of movable agricultural machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movable agricultural machine for improving cooling efficiency with a simple constitution. <P>SOLUTION: This cooling system C of the movable agricultural machine has a fan F rotating by motive power of an engine E, a radiator R cooled by its fan F and a fan shroud FS for covering the fan F, and has a shock absorbing member G for relieving vibration of its engine E in a bottom part 1 of the engine E, wherein the engine E and the radiator R are placed on the same vehicle body frame (a base) FL. The fan shroud FS is fixed to the radiator R, and the fan F is rotatably fixed to the fan shroud FS. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention comprises a fan that is rotated by the power of the engine, a radiator that is cooled by the fan, and a fan shroud that covers the fan, and a buffer member for reducing vibration of the engine at the bottom of the engine, The present invention relates to a cooling device for a movable agricultural machine in which an engine and a radiator are mounted on the same base.

  A movable agricultural machine cooling apparatus having an engine includes a radiator (a radiator), a fan for cooling the radiator, and a fan shroud as a fan casing. The radiator is fixed to the body frame (base). The fan is placed behind the radiator and sucks relatively cool air from the front of the radiator by sending air downstream. Further, the fan is configured such that its rotating shaft is directly connected to the crankshaft of the engine, and the driving force of the engine is transmitted to rotate. The fan shroud is fixed to the radiator, and the fan is provided inside the fan shroud. The fan and the fan shroud are arranged so that the tip of the fan blade rotates while maintaining a certain clearance from the fan shroud. The engine is fixed to the vehicle body frame on the opposite side of the radiator from the fan, that is, on the exhaust side of the fan. A buffer member is disposed between the engine and the vehicle body frame so as not to transmit engine vibration to the vehicle body frame.

  When the agricultural machine configured as described above travels on a field or the like, the body frame receives vibration from the road surface. For this reason, the radiator and the fan shroud vibrate in synchronization with the vehicle body frame. On the other hand, the engine is also fixed to the same body frame as the radiator and fan shroud. However, since the engine itself has a vibration inherent to the drive, the vibration from the road surface and the vibration inherent to the engine are combined to create a complicated It will vibrate. For this reason, the fan directly connected to the crankshaft of the engine vibrates in synchronization with this complicated vibration.

  Such a conventional cooling device has two problems: (1) improvement of cooling efficiency of the radiator and (2) protection of fan blades. To solve the former problem, the outside diameter of the fan is made as large as possible to increase the amount of intake air to the radiator. In order to increase the outer diameter of the fan, it was necessary to reduce the clearance between the tip of the fan blade and the fan shroud. On the other hand, the latter problem is that the fan and fan shroud vibrate differently, so the fan outer diameter must be reduced to increase the clearance from the fan shroud so that the fan blades do not contact the fan shroud. It was.

  In order to solve these two problems facing each other, technical improvements have been proposed in which the fan and the fan shroud are placed in the same vibration system. For example, Patent Document 1 discloses a technology in which a fan and a fan shroud are attached to an engine, and both the fan and the fan shroud are placed in the same vibration system as the engine. Then, another fan shroud is fixed to the radiator, and the two fan shrouds are connected by a boot (cover) made of an elastomer material. Thereby, the clearance between the fan and the fan shroud can be set small.

  Patent Document 2 discloses a technique for separating a fan and a fan shroud from an engine vibration system. That is, a support is provided adjacent to the radiator, and the fan is supported by the support. And the fan shroud which covers a fan is attached to a radiator. With this technology, the crankshaft of the engine and the rotating shaft of the fan are not directly connected. That is, a pulley is fixed on the crankshaft and another pulley is fixed on the rotating shaft of the fan. A belt is wound around the two pulleys, and the engine power is transmitted to the fan via the belt. Accordingly, the fan is not the engine vibration system, but the same vibration system as the fan shroud, so that the clearance between the fan and the fan shroud can be set small.

JP-A-8-04529 JP-A-6-74045

However, the cooling device as in Patent Document 1 requires two fan shrouds, and in addition, it is necessary to prepare a boot made of an elastomer material, which increases the number of parts and complicates the configuration. .
Moreover, in the cooling device like patent document 2, it was necessary to provide the support | pillar for supporting a fan, and there existed a problem that the number of parts increased and the structure became complicated.
Accordingly, an object of the present invention is to provide a movable agricultural machine having a simple configuration and improved cooling efficiency.

Therefore, the invention described in claim 1 includes a fan that is rotated by the power of the engine, a radiator that is cooled by the fan, and a fan shroud that covers the fan, and the vibration of the engine is applied to the bottom of the engine. In a cooling device for a movable agricultural machine that includes a buffer member for relaxing, the engine and the radiator are mounted on the same base,
The fan shroud is fixed to the radiator, and the fan is rotatably fixed to the fan shroud.

  According to a second aspect of the present invention, in the cooling device for a movable agricultural machine according to the first aspect, the fan shroud is provided with a stationary blade facing the fan.

  According to a third aspect of the present invention, in the cooling device for a movable agricultural machine according to the first aspect, the fan shroud covers all the blades of the fan.

  According to a fourth aspect of the present invention, in the cooling device for a movable agricultural machine according to the first aspect, a crank pulley fixed to a tip of a crankshaft protruding from the engine and a rotating shaft of the fan are fixed. And a fan holding belt provided between the crank pulley and the fan pulley, and a tension holding mechanism for holding the tension of the fan belt constant.

  According to a fifth aspect of the present invention, in the cooling device for a movable agricultural machine according to the fourth aspect, the tension holding mechanism includes a tension roller and a compression spring that urges the tension roller toward the fan belt. It is characterized by providing.

  According to a sixth aspect of the present invention, in the cooling device for a movable agricultural machine according to the fourth aspect of the present invention, a bearing portion that supports the rotation shaft of the fan is provided, and the radius of the rotation shaft of the fan is provided in the bearing portion. A cushioning material that absorbs a slight displacement in the direction is provided.

  According to the first aspect of the present invention, the fan includes a fan that is rotated by the power of the engine, a heat radiator that is cooled by the fan, and a fan shroud that covers the fan, and the vibration of the engine is reduced at the bottom of the engine. In a cooling device for a movable agricultural machine in which the engine and the radiator are mounted on the same base, the fan shroud is fixed to the radiator and the fan rotates to the fan shroud Since it is fixedly possible, it is not necessary to separately provide a support for supporting the fan, the number of parts is small, and the configuration can be simplified. Further, since the fan and the fan shroud vibrate synchronously, the possibility of interference between the fan blades and the fan shroud can be reduced. Accordingly, the clearance between the fan and the fan shroud can be set small, and the cooling efficiency can be increased by setting the outer diameter of the fan large.

  According to the second aspect of the present invention, since the fan shroud is provided with the stationary blade facing the fan, even if Karman vortex is formed behind the fan, the fan shroud cancels it and efficiently blows air toward the fan rear. Is possible. Thus, the fan can efficiently intake air from the front of the radiator.

  According to invention of Claim 3, since a fan shroud covers all the wing | blades of a fan, ventilation efficiency can be improved, without letting the ventilation of a fan escape in a radial direction.

  According to the fourth aspect of the present invention, the crank pulley fixed to the tip of the crankshaft protruding from the engine, the fan pulley fixed to the rotating shaft of the fan, and between the crank pulley and the fan pulley. And a tension holding mechanism that keeps the tension of the fan belt constant, so even if the engine and the fan are in different vibration systems, The belt tension can always be kept constant, and the driving force from the engine can be stably transmitted to the fan.

  According to the fifth aspect of the present invention, the tension holding mechanism includes the tension roller and the compression spring that urges the tension roller toward the fan belt. Therefore, the tension holding mechanism can be configured with a simple configuration. Can do.

  According to the sixth aspect of the present invention, since the bearing portion that supports the rotation shaft of the fan is provided, and the cushion portion that absorbs the slight displacement in the radial direction of the rotation shaft of the fan is provided in the bearing portion. When the fan belt receives a different vibration and a tension higher than the setting is applied to the fan belt, it can absorb the vibration of the rotating shaft of the fan.

It is a side view of the cooling device concerning one example of the present invention. It is a principal part expanded longitudinal cross-sectional view of FIG. FIG. 3 is an enlarged view of an essential part of FIG. 2. FIG. 3 is a cross-sectional view taken along the line XX in FIG. 2. It is a YY arrow transverse cross section of Drawing 2. It is a side surface schematic diagram of the frame part of a fan shroud. It is ZZ arrow sectional drawing of FIG.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view of the cooling device of the present invention.
The cooling device C of the present invention is fixed on the vehicle body frame FL which is the same base as the engine E. The cooling device C includes a fan F that is rotated by the power of the engine E, a radiator (heat radiator) R that is cooled by the fan F, and a fan shroud FS that covers the fan F. The radiator R is fixed to the vehicle body frame FL, and the fan shroud FS is fixed to the radiator R. The fan F is supported by the fan shroud FS. A fan pulley 7 is fixed to one end of the rotating shaft 5 of the fan F. On the other hand, the bottom 1 of the engine E is provided with a buffer member G for reducing vibration of the engine E. That is, the engine E is fixed to the vehicle body frame FL via the buffer member G. The crankshaft 4 projects from the side surface of the engine E on the radiator R side, and a crank pulley 6 is fixed to the tip of the crankshaft 4. The fan belt 3 is hung between the crank pulley 6 and the fan pulley 7.

  2 and 3 show the main part of the present invention. The fan shroud FS is configured to cover all the blades 11 of the fan F. The fan shroud FS supports the fan F in a rotatable manner. The fan F includes a blade 11 and a support portion 12. The wing 11 extends from the side surface of the cylindrical support portion 12. The blades 11 are appropriately selected in shape and attachment so as to effectively generate wind when the fan F rotates. The support part 12 is comprised by the cylindrical side part 12a and the top plate 12b which block | closes one of opening of the side part 12a. And the through-hole is formed in the center of the top plate 12b, and the rotating shaft 5 penetrates and it fixes suitably. As a result, the fan F is fixed to the rotating shaft 5.

  The rotation shaft 5 of the fan F is rotatably attached to the frame portion 15 of the fan shroud FS via a bearing portion J. Accordingly, the fan F is supported by the fan shroud FS. The bearing portion J is provided inside the support portion 12 of the fan F. The bearing portion J includes a cylindrical bearing side portion 13a and a bearing top plate 13b that closes one of the cylindrical openings, and ball bearings B are respectively fixed to the innermost side and the front side of the bearing side portion 13a. Set up. A rubber cushion sheet (cushion material) 14 is continuously attached over the outer periphery of the ball bearing B between the inner surface of the bearing side portion 13a and the outer surface of the ball bearing B. The cushion sheet 14 absorbs vibration in the radial direction of the rotating shaft 5 of the fan F. On the other hand, the rotating shaft 5 is fixed inside the ball bearing B.

  Furthermore, as shown in FIG. 4, a tension holding mechanism 20 that holds the tension of the fan belt 3 wound around between the crank pulley 6 and the fan pulley 7 at a constant level is provided. The tension holding mechanism 20 includes a tension roller frame 22, a tension roller 21 that is rotatably provided at the tip of the tension roller frame 22, and a compression spring 23 that biases the tension roller 21 toward the fan belt 3. . The compression spring 23 has one end fixed to the rear end of the tension roller frame 22 and the other end fixed to the vehicle body frame FL.

  Next, the structure of the frame portion 15 of the fan shroud FS will be described in detail with reference to FIGS. The fan shroud FS includes a cylindrical side portion 10 formed so as to surround the fan F, and a frame portion 15 formed so as to cover one of the openings of the side portion 10. The frame portion 15 has a beam shape that is gently bent. One end thereof is fixed to the end of the cylindrical side portion 10 and extends toward the center of the cylinder. The frame portion 15 is provided on the side portion 10 at regular intervals. That is, the frame portion 15 is formed radially toward the center of the side portion 10. The other end of the frame portion 15 is fixed to the bearing side portion 13a of the bearing portion J. The frame portion 15 includes a stationary blade 15a facing the fan F. Note that the clearance D between the tip of the blade 11 and the inner surface side of the side portion 10 is set as small as possible. That is, the blade 11 is formed to the maximum size within the allowable range of the clearance D.

  In the cooling device C configured as described above, when the engine E is driven, the crankshaft 4 rotates, and the rotational power is transmitted to the rotating shaft 5 of the fan F via the fan belt 3. Thereby, the fan F fixed to the rotating shaft 5 rotates. As the fan F rotates, the blades 11 form a flow of wind, and the wind is sent toward the engine E side. At the same time, relatively cool air is sucked from the front side of the radiator R. At this time, when the air in front of the radiator R passes through the radiator R, the air is exchanged with the plurality of fins formed in the radiator R, receives heat from the fins, and is guided to the fan F. Then, the fan F sends the heated air to the rear (that is, the engine E side), and is sent out to the engine E side through a plurality of formed frame portions 15.

  At this time, since the fan F of the cooling device C is rotatably attached to the fan shroud FS, the fan F and the fan shroud FS are synchronized in vibration. Therefore, the possibility of interference between the blade 11 of the fan F and the fan shroud FS can be reduced, and the clearance D between the tip of the blade 11 and the side portion 10 of the fan shroud FS can be set to a minimum.

  The vehicle body frame FL receives vibration from the traveling road surface when the vehicle body moves, and the cooling device C and the engine E receive this vibration. On the other hand, the engine E generates unique vibrations when driven. For this reason, the engine E receives a combined vibration of the vibration from the road surface and the driving vibration generated by itself, and forms a vibration system different from the cooling device C. Therefore, the fan belt 3 that is the contact point between the two is greatly affected by the difference in vibrations on both sides, and in some cases, the fan belt 3 is loosened, and the driving force of the crankshaft 4 is reliably transferred to the rotating shaft 5 side of the fan F. There is a risk of being unable to communicate. However, in the embodiment of the present invention, the tension holding mechanism 20 is pressed against the fan belt 3 to keep the tension of the fan belt 3 constant, so that the driving force of the crankshaft 4 is applied to the rotating shaft 5 side of the fan F. It can be transmitted reliably. Further, since the bearing portion J is provided with the cushion sheet 14, it is possible to absorb minute blurring (displacement) of the rotating shaft 5 due to the difference in the vibration system between the engine E side and the cooling device C side, which is more stable. Rotation can be maintained.

  By the way, conventionally, when the blades 11 are rotated, Karman vortices are formed on the rear surface thereof, that is, the engine E side, and there is a problem that proper exhaust (air blowing) from the fan F to the rear side is hindered. As a result, there has been a problem that intake from the front surface of the radiator R is not efficiently performed and cooling of the radiator R is not efficiently performed. In the present invention, the air is provided in the frame portion 15 of the fan shroud FS. The stationary blade 15a prevents the formation of the Karman vortex and can efficiently send air from the fan F to the rear.

  In addition, since the fan shroud FS covers the entire blade 11 of the fan F, it is possible to prevent the escape of the wind in the radial direction when the fan is blown, which has been a problem. This also promotes the air supply of the fan F to the engine E side.

  The present invention is not limited to the above-described embodiment. For example, in this embodiment, the shape of the frame portion 15 of the fan shroud FS is an arc shape. However, the shape is not limited to this, and it can take any form such as a straight line shape or an S shape. Further, the shape of the blade 11 of the fan F is not limited to this embodiment, and can take an optimum shape in consideration of the air blowing efficiency, the manufacturing cost, and the like. Further, the number of blades 11 is not limited to this example. Further, the fan F may be formed of cast iron or the like in addition to heat resistant plastic.

  Further, the ball bearing B used for the bearing portion J is not limited to this, and may be a bearing of another aspect such as a roller bearing. Further, the tension holding mechanism 20 is not limited to the configuration of this example, and any configuration may be adopted as long as the tension belt 3 can be held at a constant tension. Further, the rear end of the compression spring 23 is not limited to being fixed to the vehicle body frame FL. For example, the engine E itself may be fixed, or the engine E may be provided with a bracket and fixed thereto.

  Furthermore, the cushion sheet 14 used as the cushion material is not limited to this, and any material may be used as long as it can absorb minute displacement continuously. Further, the cushion material is not limited to be provided continuously along the outer periphery of the ball bearing, and may be provided in pieces at a constant interval.

  The cooling device C includes a self-propelled agricultural machine having an engine, that is, a rice transplanter, a tractor, a combiner, and the like, and a non-self-propelled movable agricultural machine having an engine, that is, a hand-held rice transplanter. And can be equipped on cultivators.

DESCRIPTION OF SYMBOLS 1 Bottom part 3 Fan belt 4 Crankshaft 5 Rotating shaft 6 Crank pulley 7 Fan pulley 10 Side part 11 Wing 12 Support part 12a Side part 12b Top plate 13a Bearing side part 13b Bearing top board 14 Cushion seat (cushion material)
15 Frame portion 15a Stator blade 20 Tension holding mechanism 21 Tension roller 22 Tension roller frame 23 Compression spring B Ball bearing C Cooling device D Clearance E Engine F Fan FL Body frame (base)
FS Fan shroud G Buffer member J Bearing part R Radiator (radiator)

Claims (6)

A fan that is rotated by the power of the engine; a radiator that is cooled by the fan; and a fan shroud that covers the fan; and a buffer member for reducing vibration of the engine at the bottom of the engine, And a radiator for a movable agricultural machine in which the radiator is mounted on the same base,
A cooling device for a movable agricultural machine, wherein the fan shroud is fixed to the radiator and the fan is rotatably fixed to the fan shroud.   The cooling device for a movable agricultural machine according to claim 1, wherein the fan shroud is provided with a stationary blade facing the fan.   The cooling device for a movable agricultural machine according to claim 1, wherein the fan shroud covers all the wings of the fan.   A crank pulley fixed to a tip of a crankshaft protruding from the engine, a fan pulley fixed to a rotating shaft of the fan, and a fan belt hung between the crank pulley and the fan pulley. The cooling device for a movable agricultural machine according to claim 1, further comprising a tension holding mechanism that holds the tension of the fan belt constant.   5. The cooling device for a movable agricultural machine according to claim 4, wherein the tension holding mechanism includes a tension roller and a compression spring that biases the tension roller toward the fan belt.   The movable part according to claim 4, further comprising a bearing part that supports a rotation shaft of the fan, and a cushioning material that absorbs a slight displacement in a radial direction of the rotation axis of the fan. Agricultural machinery cooling system.

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