JP6142946B1 - Work vehicle - Google Patents

Abstract

To provide a work vehicle capable of realizing engine cooling and removal of sawdust and dust with a simple configuration. A combine as a work vehicle includes an engine 20 as a drive source, a radiator 30 that cools cooling water of the engine 20, and a single fan 40 disposed between the engine 20 and the radiator 30. And a power switching mechanism 60 for selectively switching a path for transmitting power from the engine 20 to the fan 40 to a first transmission path W1 for normal rotation of the fan 40 and a second transmission path W2 for reverse rotation. . [Selection] Figure 2

Description

  The present invention relates to a work vehicle.

  Conventionally, in a work vehicle such as a combine, a cooling fan that sucks outside air into a radiator that cools an engine provided in a prime mover, and dust and dust attached to a filter disposed on the surface of the radiator or in front of the radiator There was a thing provided with the fan for dust removal which blows away (for example, refer to patent documents 1).

JP-A-2015-189386

  However, in the conventional configuration described above, the drive mechanism that rotates the cooling fan and the drive mechanism that rotates the dust exhaust fan are configured separately, which increases the number of parts and increases costs. It was also a factor. Further, since the cooling fan and the dust exhaust fan are arranged side by side in the axial direction, the width in the axial direction becomes wide.

  The present invention has been made in view of the above, and an object of the present invention is to provide a work vehicle that can realize engine cooling and removal of dust and dirt with a simple configuration.

In order to solve the above-described problems and achieve the object, the work vehicle (1) according to claim 1 includes an engine (20) serving as a drive source and a radiator that cools cooling water of the engine (20). 30), a single fan (40) disposed between the engine (20) and the radiator (30), and a path for transmitting power from the engine (20) to the fan (40). , A first transmission path (W1) including a first belt (51) for normal rotation of the fan (40) and a second transmission path including a second belt (52) for reverse rotation of the fan (40). (W2) and to selectively switch the power switching mechanism (60) and Bei example, said power switching mechanism (60), a pair of gears that mesh with each other (61), (61) is housed the gear case (62) And from the gear case (62) A first transmission shaft (71) protruding and connected to one of the pair of gears (61), (61) and a second transmission shaft (72 connected to the other of the pair of gears (61), (61). ), A forward pulley (81) attached to the first transmission shaft (71), an input pulley (82) for inputting power from the engine (20), and the second transmission shaft A reverse rotation pulley (83) attached to (72) and an output pulley attached to the output shaft (73) of the engine (20) and interlocking with the input pulley (82) via a transmission belt (50) 84), the forward rotation pulley (85) that is provided on the fan (40) and is linked to the forward rotation pulley (81) via the first belt (51), and the fan (40). Front through the second belt (52) Power for rotating the fan (40) is transmitted to any one of the reverse rotation pulley (86) interlocked with the reverse rotation pulley (83) and the first belt (51) and the second belt (52). A tension mechanism (90) that selectively applies tension, and the forward pulley (81) and the reverse pulley (83) are virtual around the rotation axis (41) of the fan (40). It was set as the structure arrange | positioned at circular arc shape (C) .

The work vehicle (1) according to claim 2 is the work vehicle (1) according to claim 1 , wherein the tension mechanism (90) includes the first belt (51) and the second belt (52). A roller body (91) that is provided between the first belt (51) and the second belt (52) and applies a tension to which power for rotating the fan (40) is transmitted. It was set as the structure provided with.

The work vehicle (1) according to claim 3 is the work vehicle (1) according to claim 2 , wherein the roller body (91) is connected to the first belt (51) and the second belt (52). Roller movable to move to a neutral position where no tension is applied, a forward rotation position where tension is applied only to the first belt (51), and a reverse position where tension is applied only to the second belt (52). A mechanism (100) is provided.

The work vehicle (1) according to claim 4 is the work vehicle (1) according to claim 3 , wherein the roller movable mechanism (100) has the roller body (91) attached to one end thereof, and a support shaft ( 101) a swingable casing (102), a rotating body (103) that swings the casing (102) around the support shaft (101), and a drive unit that rotates the rotating body (103) (104).

The work vehicle (1) according to claim 5 is the work vehicle (1) according to any one of claims 1 to 4 , wherein the forward rotation pulley () is attached to a tip of the first transmission shaft (71). 81) is attached, and the input pulley (82) is attached to the gear case (62) side of the forward rotation pulley (81).

The work vehicle (1) according to claim 6 is the work vehicle (1) according to claim 5 , wherein the reverse pulley (83) attached to the second transmission shaft (72) is the first vehicle. The forward rotation pulley (81) attached to the tip of one transmission shaft (71) is arranged to be biased toward the fan (40) side, and the transmission belt (50), the first A belt (51) and the second belt (52) are disposed.

The work vehicle (1) according to claim 7 is the work vehicle (1) according to any one of claims 1 to 6 , wherein the forward rotation pulley is arranged on one end side of the first transmission shaft (71). (81) and the input pulley (82) are attached, and the other end side of the first transmission shaft (71) is a helical shaft drive for driving the discharge spiral shaft (850) of the Glen tank (8). A pulley (87) is attached.

The work vehicle (1) according to claim 8 is the work vehicle (1) according to any one of claims 1 to 7 , comprising a fan support member (400) that supports the fan (40), The fan support member (400) supports the plate (410) to which the shaft portion (43) of the fan (40) is attached, and the plate (410), and also supports the shroud (42) of the fan (40). A pair of frames (421) and (422) that are respectively connected at both ends, and when viewed from the rotational axis direction of the fan (40), the pair of frames (421) and (422) The belt (51) and the second belt (52) are constructed so as to be sandwiched between the belts (51) and (52) along the extending direction of the second belt (52).

According to the work vehicle of the first aspect, the single fan can be rotated forward / reversely via two transmission paths each having a belt, and if the forward rotation is performed, the wind is sent to the radiator, while the reverse rotation is performed. By doing so, it is possible to blow away dust and dirt adhering to the surface of the radiator and the filter disposed in front of the radiator. Thus, overheating of the engine can be effectively prevented while having a very simple configuration. In addition, for example, an engine overheating can be effectively prevented by using a power switching mechanism that can be arranged without expanding the prime mover. In addition, the looseness and tension of the first belt and the second belt are not unbalanced, and the two paths for transmitting power from the engine to the fan can be switched more reliably. In particular, even if there is only one roller body, switching between the two paths becomes easy .

According to the work vehicle according to claim 2, by one roller body, in a first transmission path and the second transmission path can be selectively switched, in addition to the effect of the invention according to claim 1 Therefore, the engine can be prevented from overheating with a simpler configuration.

According to the work vehicle of the third aspect , in addition to the effect of the invention of the second aspect , in a state where the tension is applied to one side, the tension is not applied to the other while having a simple configuration. Can be reliably configured.

According to the work vehicle of the fourth aspect , in addition to the effect of the invention of the third aspect , in a state where tension is applied to one side, a state where no tension is applied to the other is more reliably configured. Can do.

According to the work vehicle of the fifth aspect , in addition to the effect of the invention of any one of the first to fourth aspects, the engine power switching mechanism can be configured more compactly.

According to the work vehicle described in claim 6 , in addition to the effect of the invention described in claim 5 , the power switching mechanism can be configured compactly without particularly changing the positional relationship between the engine and the radiator.

According to the work vehicle of the seventh aspect , in addition to the effect of the invention of any one of the first to sixth aspects, the work vehicle can be driven to the discharge spiral shaft of the Glen tank via one gear case. Therefore, the number of parts as a work vehicle can be reduced and the cost can be reduced.

According to the work vehicle of the eighth aspect , in addition to the effect of the invention of any one of the first to seventh aspects, the first belt and the second belt can be easily attached and detached. Thus, workability such as belt replacement can be improved.

FIG. 1 is a side view of a combine as a work vehicle according to an embodiment. FIG. 2 is a schematic explanatory view in plan view of the power switching mechanism in the above-described combine. FIG. 3 is a schematic explanatory view of the same power switching mechanism as seen from the side. FIG. 4 is an explanatory diagram showing the inside of the prime mover in the above combine in front view. FIG. 5 is a side view showing the layout of the fan and the power switching mechanism in the above combine. FIG. 6A is an explanatory diagram illustrating an example of the movement of the roller body of the tension mechanism. FIG. 6B is an explanatory diagram illustrating an example of the movement of the roller body of the tension mechanism. FIG. 7 is an explanatory view showing an arrangement example of the forward rotation pulley and the reverse rotation pulley with respect to the central axis of the fan. FIG. 8 is a side view of a gear case provided in the above power switching mechanism. FIG. 9 is an explanatory diagram of the gear case shown in FIG. FIG. 10 is a schematic explanatory view showing a modification of the pulley included in the power switching mechanism.

  An embodiment of a work vehicle according to the present invention will be described in detail based on the drawings. In the following, an example of a work vehicle will be described as a combine. However, the present invention is not limited to this embodiment, and various modifications can be made without departing from the scope of the present invention. Furthermore, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same, that is, so-called equivalent ranges.

  FIG. 1 is a side view of a combine 1 according to the embodiment. In the following description, the front-rear direction, the left-right direction, and the up-down direction in the normal usage mode of the combine 1 will be described as the respective front-rear direction, left-right direction, and up-down direction in each part. That is, the front-rear (X-axis) direction is the length direction of the combine 1, the left-right (Y-axis) direction is the width direction, and the up-down (Z-axis) direction is the height direction. Among these, the front is the traveling direction of the combine 1 during the cutting operation, the left is the left-hand direction toward the front, and the lower is the direction in which gravity acts. In addition, these directions are defined for convenience in order to make the explanation easy to understand, and the present invention is not limited by these directions.

<Overall configuration of combine 1>
As shown in FIG. 1, the combine 1 includes an aircraft frame 2, a traveling device 3 provided on the lower side of the aircraft frame 2, a cabin 6 provided on the upper front side of the aircraft frame 2, and a front side of the cabin 6. A reaping device 7 attached below and a threshing device (not shown) attached to the rear left side of the body frame 2 are provided.

  In addition, behind the cabin 6, on the right side of the threshing device, there is provided a Glen tank 8 for storing the grains threshed and selected by the threshing device. It is discharged outside. The grain discharge auger 9 can discharge the grain stored in the grain tank 8 to the outside by driving a helical shaft (see FIG. 2) provided inside.

  An engine room is provided on the lower right side of the cabin 6 and accommodates the prime mover 10 having an engine 20 as a power source. In addition, the engine room which accommodates the drive part 10 is covered with the cover 10a to which the filter part (illustration omitted) was attached.

  The prime mover 10 housed in the engine room has a radiator 30 (see FIG. 2) and a radiator fan (“fan” in the claims) 40 to cool the cooling water of the engine 20, and power from the engine 20. A power switching mechanism 60 is provided that transmits to the radiator fan 40 so as to be switched between two systems. The power switching mechanism 60 is a main part of the present embodiment, and will be described later together with the configuration of the driving unit 10.

<Running device 3>
The traveling device 3 includes a pair of left and right crawler belts 4 that circulate when power is transmitted from the engine 20, and the combine 1 can travel on the field by the crawler belts 4.

<Cabin 6>
The cabin 6 provided on the upper front side of the fuselage frame 2 functions as a cockpit, and is provided with a driver seat, various control levers, instruments and operation panels (not shown), and a monitor capable of displaying various information. It is done.

<Mowing device 7>
The reaping device 7 includes a weed cocoon for weeding the cereals in the field, a raising device for causing the sown cereals, and a cutting blade for cutting the roots of the induced cereals. The cereals that are brushed are sown with a weed cocoon, the cereals that have been weeded are raised and caused with a device, and the cereal that is caused is cut with a cutting blade.

<Moving part 10>
2 is a schematic explanatory view of the power switching mechanism 60 in the combine 1 in a plan view, FIG. 3 is a schematic explanatory view in a side view of the power switching mechanism 60, and FIG. 4 is a front view of the inside of the prime mover 10 in the combine 1. FIG. 5 is an explanatory diagram showing the layout, and FIG. 5 is an explanatory diagram showing a layout of the radiator fan 40 and the power switching mechanism 60 in the combine 1 in a side view.

  As shown in FIG. 2, the driving unit 10 disposed in the engine room includes an engine 20 disposed so that the output shaft 73 faces the right side with respect to the traveling direction of the aircraft, and the right side of the engine 20 (in FIG. 2). A radiator 30 disposed at a predetermined interval on the left side) and a single radiator fan 40 disposed between the engine 20 and the radiator 30 are provided.

  The radiator fan 40 rotates using the engine 20 as a drive source. However, in the combine 1 according to this embodiment, the output shaft 73 of the engine 20 and the rotation shaft 41 of the radiator fan 40 are not directly connected. It is linked by belt drive. That is, as shown in FIG. 3, the rotating shaft 41 of the radiator fan 40 is disposed above the output shaft 73 of the engine 20.

  That is, as shown in FIG. 2, the driving unit 10 includes a first belt 51 that rotates the radiator fan 40 forward (for example, clockwise) as a path for transmitting power from the engine 20 to the radiator fan 40. A transmission path W1 and a second transmission path W2 including a second belt 52 that reversely rotates the radiator fan 40 (for example, counterclockwise) are provided. In this embodiment, a power switching mechanism 60 that selectively switches between the first transmission path W1 and the second transmission path W2 is provided.

(Power transmission path)
Here, the power transmission path including the first transmission path W1 and the second transmission path W2 for transmitting power from the engine 20 to the radiator fan 40 in the combine 1 will be described mainly with reference to FIGS. To do.

  As shown in FIG. 2, the combine 1 according to the present embodiment includes a gear case 62 in which a pair of gears 61 and 61 that mesh with each other are housed. Here, the gears 61 and 61 are spur gears.

  The gear case 62 is disposed at the lower rear of the engine 20 (see FIG. 4). The gear case 62 is provided with a first transmission shaft 71 and a second transmission shaft 72 that protrude outward. Yes. The first transmission shaft 71 is connected to one of the pair of gears 61, 61, and the second transmission shaft 72 is connected to the other gear 61. In the present embodiment, the first transmission shaft 71 passes through the gear case 62 and extends in the left-right direction, and the second transmission shaft 72 projects to the right side (left side in FIG. 2) of the gear case 62. .

  An input pulley 82 and a forward rotation pulley 81 are juxtaposed from the inside at a portion of the first transmission shaft 71 protruding from the gear case 62 to the right side of the machine body. On the other hand, an output pulley 84 is attached to the output shaft 73 of the engine 20, and the transmission belt 50 is stretched between the output pulley 84 and the input pulley 82. In FIG. 3, a reference numeral 500 indicates a tension roller that contacts the transmission belt 50.

  Further, as shown in FIGS. 2 and 4, a reverse pulley 83 is attached to the tip of the second transmission shaft 72 positioned above the first transmission shaft 71.

  A forward rotation pulley 85 is attached to the rotating shaft 41 of the radiator fan 40 at its tip end (end on the engine 20 side), and the reverse rotation pulley 86 is disposed at a predetermined interval from the forward rotation pulley 85. It is attached to the fan 40 side.

  While the first belt 51 is stretched between the forward rotation pulley 81 attached to the first transmission shaft 71 of the gear case 62 and the forward rotation pulley 85 attached to the rotation shaft 41 of the radiator fan 40, The second belt 52 is stretched between the reverse rotation pulley 83 attached to the second transmission shaft 72 of the gear case 62 and the reverse rotation pulley 86 attached to the rotation shaft 41 of the radiator fan 40.

  That is, in this embodiment, the forward rotation pulley 81 is attached to the tip of the first transmission shaft 71, and the input pulley 82 is attached to the gear case 62 side of the forward rotation pulley 81. The distance between the output pulley 84 provided on the output shaft 73 of the engine 20 and the normal rotation pulley 85 provided on the rotation shaft 41 of the radiator fan 40 is equal to the distance between the normal rotation pulley 81 and the input pulley 82 in the Y-axis direction. A first transmission path W1 that is configured to be equal and includes the transmission belt 50 and the first belt 51 is formed.

  Further, the reverse rotation pulley 83 attached to the second transmission shaft 72 is arranged to be biased to the radiator fan 40 side relative to the forward rotation pulley 81 attached to the tip of the first transmission shaft 71. The distance between the reverse rotation pulley 83 and the forward rotation pulley 81 is configured to be equal to the distance between the reverse rotation pulley 86 provided on the rotating shaft 41 of the radiator fan 40 and the normal rotation pulley 85 in the Y-axis direction. A second transmission path W2 including the belt 50, the first belt 51, and the second belt 52 is formed.

  Thus, in the driving section 10 having the first transmission path W1 and the second transmission path W2, the transmission belt 50, the first belt 51, and the second belt 52 are disposed in order from the inner side of the machine body. .

  Therefore, the power switching mechanism 60 that selectively switches between the first transmission path W1 and the second transmission path W2 can be configured compactly as will be described later, and the limited space between the engine 20 and the radiator 30 is limited. It becomes possible to arrange | position efficiently.

  Furthermore, by adopting the compact power switching mechanism 60, it is possible to efficiently arrange the entire driving section 10 in the engine room of the limited size of the combine 1, and as a result. The positional relationship between the engine 20 and the radiator 30 need not be changed from the conventional positional relationship.

  As described above, the first transmission path W1 includes the output shaft 73 and the output pulley 84 of the engine 20, the first transmission shaft 71 of the gear case 62, the input pulley 82 and the forward rotation pulley 81, and the rotation of the radiator fan 40. The shaft 41 and the forward pulley 85 are configured. Therefore, the power from the engine 20 transmitted to the radiator fan 40 by the first transmission path W1 is, as shown in FIG. 2, output shaft 73 (output pulley 84) → first transmission shaft 71 (input pulley 82 and Forward rotation pulley 81) → rotating shaft 41 (forward rotation pulley 85) is transmitted, and the radiator fan 40 rotates forward.

  The second transmission path W2 includes an output shaft 73 of the engine 20, an output pulley 84, a first transmission shaft 71 of the gear case 62, an input pulley 82, a pair of gears 61 and 61, a second transmission shaft 72, The pulley 83 for reverse rotation, the rotating shaft 41 of the radiator fan 40, and the reverse pulley 86 are comprised. Therefore, the power from the engine 20 transmitted to the radiator fan 40 through the second transmission path W2 is, as shown in FIG. 2, output shaft 73 (output pulley 84) → first transmission shaft 71 (input pulley 82). It is transmitted via the path of one gear 61 → the other gear 61 → the second transmission shaft 72 (reverse rotation pulley 83) → the rotation shaft 41 (reverse rotation pulley 86), and the radiator fan 40 rotates in the reverse direction.

  Thus, in the combine 1 which concerns on this embodiment, the filter of the cover 10a (FIG. 1) which covers the surface of the radiator 30 and engine room by cooling the engine 20 by rotating the single radiator fan 40 forward or reverse. It is possible to remove sawdust and dust adhering to the part.

  Incidentally, the radiator fan 40 according to the present embodiment is attached to a shroud 42 surrounding the radiator fan 40 via a fan support member 400, as shown in FIG.

  That is, as shown in FIGS. 4 and 5, the fan support member 400 includes a plate 410 to which the shaft portion 43 of the radiator fan 40 is attached, and the plate 410 is connected to and supported by the shroud 42 of the radiator fan 40 at both ends. Are provided with a pair of frames 421 and 422, respectively. In FIG. 4, reference numeral 44 denotes a bearing, and the shaft portion 43 of the radiator fan 40 is supported by the plate 410 via the bearing 44.

  As shown in FIG. 4, the pair of frames 421 and 422 are each formed in a flat U shape, and each end is connected to the shroud 42. At this time, both the frames 421 and 422 are installed in a C-shaped manner that gradually expands downward so as to sandwich both belts along the extending direction of the first belt 51 and the second belt 52. ing.

  The plate 410 has mounting portions 411a, b, 412a, b extending in four directions, and the respective leading end portions are connected to the frames 421, 422. As shown in the drawing, the attachment portions 411a, b, 412a, b are higher than the attachment portions 411a, 412a positioned higher in the height direction so as to correspond to the pair of frames 421, 422 arranged in a C shape. The lower mounting portions 411b and 412b are relatively long.

  Thus, since the radiator fan 40 is attached to the shroud 42 via the fan support member 400 having the above-described configuration, belt replacement work such as attachment and removal of the first belt 51 and the second belt 52 can be easily performed. It is possible to improve workability.

<Power switching mechanism 60>
Next, the power switching mechanism 60 will be described. The power switching mechanism 60 selectively switches between the first transmission path W1 and the second transmission path W2, and reliably rotates the radiator fan 40 to either the first belt 51 or the second belt 52. A tension mechanism 90 that selectively applies tension for generating force is provided.

  The tension mechanism 90 includes a roller body 91 disposed between the first belt 51 and the second belt 52 as shown in FIGS. 2 and 3. As shown in FIG. 2, the first belt 51 and the second belt 52 are separated by a distance corresponding to the distance between the forward rotation pulley 81 and the forward rotation pulley 85, and the reverse rotation pulley 83 and the reverse rotation pulley 86 in the body width direction. Is provided.

  Therefore, the roller body 91 is formed to have a size equal to or larger than the width obtained by adding at least the width of the first belt 51, the width of the second belt 52, and the distance between the belts 51 and 52. The roller body 91 is interlocked and connected to the roller movable mechanism 100 as shown in FIGS. 3 and 5.

<Roller moving mechanism 100>
As shown in FIGS. 3 and 5, the roller movable mechanism 100 has a roller body 91 attached to one end thereof, a housing 102 that can swing around a support shaft 101, and the housing 102 that swings around the support shaft 101. A rotating body 103 to be rotated and a motor 104 as a driving unit for rotating the rotating body 103 are provided.

  The center of the rotating body 103 is connected to the output shaft 103a of the casing 106 that houses gears and the like that are linked and connected to the output shaft (not shown) of the motor 104. Are connected.

  And the base end of the spring 107 which connected the front-end | tip to the housing 102 is connected with the front-end | tip of the arm bodies 105 and 105, respectively. The tips of the two springs 107 are connected to a position where the support shaft 101 is sandwiched between them. With this configuration, when the motor 104 is rotated forward or backward, one spring 107 is pulled and the other spring 107 is loosened, so that the housing 102 swings around the support shaft 101.

  When the housing 102 swings around the support shaft 101, as shown in the figure, the roller body 91 attached to the tip of the housing 102 pushes in either the first belt 51 or the second belt 52, and the radiator fan 40 is moved. A tension that generates a force sufficient to rotate can be selectively applied.

  6A and 6B are explanatory views showing an example of the movement of the roller body 91 of the tension mechanism 90. FIG. Although illustration is omitted, it is preferable that the roller body 91 has grooves or the like corresponding to the first belt 51 and the second belt 52 formed on the outer surface thereof.

  When tension is applied to the first belt 51 using the roller body 91, that is, when the radiator fan 40 is rotated forward, the casing 102 is swung so that the roller body 91 moves downward as shown in FIG. 6A. Let On the other hand, when tension is applied to the second belt 52, that is, when the radiator fan 40 is reversed, the casing 102 is swung so that the roller body 91 moves upward as shown in FIG. 6B.

  As described above, the roller body 91 has a neutral position (FIG. 6A (a), FIG. 6B (a)) where no tension is applied to either the first belt 51 or the second belt 52 by the roller moving mechanism 100, and the first position. It moves to a forward rotation position (FIG. 6A (c)) that contacts only the first belt 51 and a reverse rotation position (FIG. 6B (c)) that contacts only the second belt 52. Therefore, the selective switching between the first transmission path W1 and the second transmission path W2 can be reliably performed by the roller movable mechanism 100 that includes the single roller body 91 and can be configured at a low cost.

  Note that when the roller body 91 is swung, the rotational speed of the motor 104 may be appropriately reduced. That is, since the movement of the roller body 91 is also slower than when the motor 104 is rotated at a high speed, when one of the first belt 51 or the second belt 52 starts to loosen, the tension of the other belt increases. Therefore, for example, the forwardly rotating radiator fan 40 decelerates and gradually increases in the reverse direction, so that the slip noise of the belt 51 (52) is suppressed as much as possible, and the quietness is improved. To do.

  Further, for example, when the roller body 91 is moved from the state shown in FIG. 6A to the state shown in FIG. 6B or vice versa, the roller body 91 is separated from the belt (51, 52). Since a repulsive force is generated from the belt (51, 52), the driving force of the motor 104 is assisted as a result. Therefore, the roller movable mechanism 100 having the configuration according to the present embodiment can smoothly switch between the first transmission path W1 and the second transmission path W2 even with the relatively small motor 104.

(Other)
By the way, as shown in FIG. 7, the forward rotation pulley 81 and the reverse rotation pulley 83 can be arranged on a virtual arc C centered on the rotation shaft 41 of the radiator fan 40. That is, the forward rotation pulley 81 and the reverse rotation pulley 83 are arranged at the same distance from the rotary shaft 41 of the radiator fan 40. FIG. 7 is an explanatory view showing an arrangement example of the forward rotation pulley 81 and the reverse rotation pulley 83 with respect to the rotation shaft 41 of the radiator fan 40.

  Thus, by arranging the forward rotation pulley 81 and the reverse rotation pulley 83 on the virtual arc C having the radius R from the rotation shaft 41 of the radiator fan 40, the tension in the first belt 51 and the second belt 52 is increased. The looseness and tension of the arm will not become unbalanced. Therefore, the first transmission path W <b> 1 and the second transmission path W <b> 2 (see FIG. 2) that transmit power from the engine 20 to the radiator fan 40 can be reliably switched by the single roller body 91. Further, the first belt 51 and the second belt 52 can be shared, and the cost can be reduced.

  The number of fans of the radiator fan 40 shown in FIGS. 3 and 7 is seven, whereas in the example shown in FIG. 7, the number is eight. That is, the number of fans of the radiator fan 40 is not particularly limited, and the size can be appropriately determined in consideration of the air blowing capability.

  Further, as shown in FIG. 2, the combine 1 according to the present embodiment has a forward rotation pulley 81 and an input pulley 82 attached to one end side of the first transmission shaft 71, that is, a portion extending from the gear case 62 to the right side of the machine body. On the other hand, a helical shaft drive pulley 87 for driving the discharge helical shaft 850 of the Glen tank 8 (see FIG. 1) is attached to the other end side, that is, a portion extending from the gear case 62 to the left side of the machine body.

  As shown in FIG. 2, the power transmission path from the helical shaft drive pulley 87 to the discharge helical shaft 850 is configured as follows.

  That is, a first gear box 800 that houses a bevel gear set 801 is provided between the gear case 62 and the discharge spiral shaft 850, and a transmission pulley 88 is attached to a shaft 802 connected to one of the bevel gear sets 801. A third belt 53 is stretched between the helical shaft driving pulley 87 and the third shaft 53. A clutch 840 for turning on and off the tension of the third belt 53 is provided between the transmission pulley 88 and the helical shaft drive pulley 87.

  The other end of the bevel gear set 801 is connected to the base end of the vibro shaft 810, and the tip end of the vibro shaft 810 is connected to the base end of the discharge spiral shaft 850 via the second gear box 820. Note that, for example, a transmission gear group 821 in which a plurality of spur gears mesh is housed in the second gear box 820. The vibro shaft 810 is provided with a cam body 830 that strikes the bottom of the Glen tank 8.

  Thus, in the combine 1 according to the present embodiment, in addition to the forward / reverse rotation of the radiator fan 40, the discharge spiral shaft 850 of the grain discharge auger 9 can be driven.

  Furthermore, in the present embodiment, an air conditioner driving pulley 89 for driving the air conditioner compressor 200 is provided on the other end side of the first transmission shaft 71 so as to be adjacent to the helical shaft driving pulley 87. . A fourth belt 54 is stretched between the air conditioner driving pulley 89 and the air conditioner passive pulley 210 linked to the compressor 200. In addition, the helical shaft drive pulley 87 and the air conditioner drive pulley 89 in this embodiment are integrally configured by a double pulley as described later (see FIG. 9).

  Therefore, in the combine 1 which concerns on this embodiment, it is set as the simple structure which provided the gear case 62, and while suppressing cost increase, the forward rotation / reverse rotation of the radiator fan 40 and the discharge spiral shaft of the grain discharge auger 9 In addition to the drive of 850, the drive of the compressor 200 for the air conditioner can also be performed.

  Here, the configuration of the gear case 62 included in the power switching mechanism 60 described above will be described with reference to FIGS. 8 and 9. FIG. 8 is a side view of the gear case 62, and FIG. 9 is an explanatory view of the gear case 62 shown in FIG.

  As shown in the drawing, the gear case 62 is formed with a flange 621 for attachment to the machine body at the base, and an oval case main body 622 extending obliquely upward from the base at an angle of about 45 °.

  As shown in FIG. 9, the case main body 622 has a first shaft housing portion 623 that houses the first transmission shaft 71 that is relatively short and bulges at the bottom of the case, and is relatively long. A second shaft housing portion 624 that houses the second transmission shaft 72 is formed to bulge in the upper part of the case. A pair of gears 61 and 61, which are spur gears that mesh with each other, are housed on the side of the case body 622 that is close to the helical shaft driving pulley 87 and the air conditioner driving pulley 89.

  By adopting the gear case 62 having such a configuration in the power switching mechanism 60, switching between the first transmission path W1 and the second transmission path W2 is facilitated, and the forward or reverse rotation of the radiator fan 40 is selectively performed. However, the driving of the discharge spiral shaft 850 and the driving of the air conditioner can be performed with a simple configuration.

  From the embodiment described above, the following combine 1 can be realized.

  (1) The engine 20 as a drive source, the radiator 30 for cooling the cooling water of the engine 20, a single radiator fan 40 disposed between the engine 20 and the radiator 30, and the power from the engine 20 The first transmission path W1 including the first belt 51 that forwardly rotates the radiator fan 40, and the second transmission path W2 including the second belt 52 that reversely rotates the radiator fan 40 are transmitted to the radiator fan 40. The combine 1 provided with the power switching mechanism 60 selectively switched to.

  (2) In the configuration of the above (1), the power switching mechanism 60 is connected to one of the pair of gears 61, 61 projecting from the gear case 62 storing the pair of gears 61, 61 meshing with each other, and the gear case 62. The first transmission shaft 71 and the second transmission shaft 72 connected to the other of the pair of gears 61, 61, the forward rotation pulley 81 attached to the first transmission shaft 71 and the power from the engine 20 are input. An input pulley 82, a reverse rotation pulley 83 attached to the second transmission shaft 72, an output pulley 84 attached to the output shaft 73 of the engine 20 and linked to the input pulley 82 via the transmission belt 50. The forward rotation pulley 85 which is provided in the radiator fan 40 and interlocks with the forward rotation pulley 81 via the first belt 51, and the radiator fan 40, and the second The tension for transmitting the power for rotating the radiator fan 40 is selectively applied to the reverse rotation pulley 86 that is linked to the reverse rotation pulley 83 and the first belt 51 or the second belt 52 via the belt 52. A combine 1 including a tension mechanism 90.

  (3) In the configuration of the above (2), the tension mechanism 90 is disposed between the first belt 51 and the second belt 52, and a radiator fan is provided between the first belt 51 and the second belt 52. A combine 1 configured to include a roller body 91 that applies tension to which power for rotating 40 is transmitted.

  (4) In the configuration of (3), the roller body 91 is moved to a neutral position where no tension is applied to either the first belt 51 or the second belt 52, and to a forward rotation position where tension is applied only to the first belt 51. And a combine 1 including a roller movable mechanism 100 that moves to a reverse rotation position that applies tension only to the second belt 52.

  (5) In the configuration of (4) above, the roller movable mechanism 100 has a roller body 91 attached to one end, a housing 102 that can swing around the support shaft 101, and the housing 102 that swings around the support shaft 101. A combine 1 including a rotating body 103 to be moved and a drive unit 104 to rotate the rotating body 103.

  (6) In any one of the configurations (2) to (5), the forward rotation pulley 81 and the reverse rotation pulley 83 are arranged in a virtual arcuate shape C around the rotation shaft 41 of the radiator fan 40. Combine 1 as configured.

  (7) In any one of the configurations (2) to (6), the forward rotation pulley 81 is attached to the tip of the first transmission shaft 71, and the input pulley 82 is closer to the gear case 62 than the forward rotation pulley 81. Combine 1 to which is attached.

  (8) In the configuration of (7), the reverse rotation pulley 83 attached to the second transmission shaft 72 is closer to the radiator fan 40 than the forward rotation pulley 81 attached to the tip of the first transmission shaft 71. A combine 1 in which a transmission belt 50, a first belt 51, and a second belt 52 are arranged in an offset manner in order from the inside of the machine body.

  (9) In any one of the above configurations (2) to (8), the forward rotation pulley 81 and the input pulley 82 are attached to one end side of the first transmission shaft 71, while the first transmission shaft 71 The combine 1 to which the helical shaft drive pulley 87 for driving the discharge helical shaft 850 of the Glen tank 8 is attached to the other end side.

  (10) In any one of the above configurations (2) to (9), the fan support member 400 that supports the radiator fan 40 is provided, and the fan support member 400 is a plate 410 to which the shaft portion 43 of the radiator fan 40 is attached. And a pair of frames 421 and 422 that support the plate 410 and are connected to the shroud 42 of the radiator fan 40 at both ends, respectively, and when viewed from the direction of the rotational axis of the radiator fan 40, Reference numeral 422 denotes a combine 1 constructed so as to sandwich the belts 51 and 52 along the extending direction of the first belt 51 and the second belt 52.

<Modification>
In the embodiments that have been described above, the pulleys for configuring the first transmission path W1 and the second transmission path W2 are configured to use independent pulleys. However, for example, as shown in FIG. 10, a double pulley 860 can be used instead of the forward pulley 81 and the input pulley 82 arranged in parallel with the first transmission shaft 71 provided in the gear case 62. FIG. 10 is a schematic explanatory view showing a modification of the pulley provided in the power switching mechanism 60.

  Further, instead of the forward pulley 85 and the reverse pulley 86 provided on the rotating shaft 41 of the radiator fan 40, a double pulley 870 can also be used.

  Thus, by using the double pulley 860 (870), the number of parts can be reduced and the cost can be reduced.

  In the above-described embodiment, the forward rotation pulley 85 and the reverse rotation pulley 86 have the same diameter.

  In the embodiment described above, the pair of gears 61 and 61 housed in the gear case 62 are spur gears, but other types of gears may be used. For example, when the extending directions of the first transmission shaft 71 and the second transmission shaft 72 are not parallel, a bevel gear or the like may be used.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

DESCRIPTION OF SYMBOLS 1 Combine 8 Glen tank 10 Driving part 20 Engine 30 Radiator 40 Radiator fan 41 Rotating shaft 42 Shroud 43 Shaft part 50 Transmission belt 51 First belt 52 Second belt 61 Gear 62 Gear case 71 First transmission shaft 72 Second transmission shaft 81 Forward pulley 82 Input pulley 83 Reverse pulley 84 Output pulley 85 Forward pulley 86 Reverse pulley 87 Helical shaft drive pulley 90 Tension mechanism 91 Roller body 100 Roller movable mechanism 101 Support shaft 102 Housing 103 Rotating body 104 Motor (drive unit)
400 Fan support member 410 Plate 421,422 Frame 850 Discharge spiral shaft

Claims (8)

An engine as a driving source,
A radiator for cooling the cooling water of the engine;
A single fan disposed between the engine and the radiator;
A path for transmitting the power from the engine to the fan is selected as a first transmission path including a first belt for normal rotation of the fan and a second transmission path including a second belt for reverse rotation of the fan. A power switching mechanism that automatically switches ,
The power switching mechanism is
A gear case that houses a pair of gears that mesh with each other;
A first transmission shaft protruding from the gear case and connected to one of the pair of gears, and a second transmission shaft connected to the other of the pair of gears;
Forward pulleys respectively attached to the first transmission shaft and input pulleys for inputting power from the engine;
A reverse pulley attached to the second transmission shaft;
An output pulley attached to the output shaft of the engine and interlocking with the input pulley via a transmission belt;
A forward pulley provided on the fan and interlocking with the forward pulley via the first belt;
A reverse pulley provided on the fan and interlocking with the reverse pulley via the second belt;
A tension mechanism that selectively applies tension to which power for rotating the fan is transmitted to either the first belt or the second belt;
The work vehicle having a configuration in which the forward rotation pulley and the reverse rotation pulley are arranged in a virtual arc shape centering on a rotation axis of the fan . The tension mechanism is
A roller body that is disposed between the first belt and the second belt and that applies tension to transmit power for rotating the fan is provided to one of the first belt and the second belt. The work vehicle according to claim 1 , which is configured. The roller body has a neutral position where no tension is applied to either the first belt or the second belt, a forward rotation position where tension is applied only to the first belt, and tension is applied only to the second belt. The work vehicle according to claim 2 , further comprising: a roller movable mechanism that moves to a reverse rotation position. The roller moving mechanism is
The roller body is attached to one end, and a housing that can swing around a support shaft;
A rotating body that swings the housing around the support shaft;
The work vehicle according to claim 3 , comprising: a drive unit that rotates the rotating body. The work vehicle according to any one of claims 1 to 4 , wherein the forward pulley is attached to a tip of the first transmission shaft, and the input pulley is attached to the gear case side of the forward pulley. The reverse rotation pulley attached to the second transmission shaft is arranged to be biased toward the fan side with respect to the forward rotation pulley attached to the tip of the first transmission shaft. The work vehicle according to claim 5 , wherein a transmission belt, the first belt, and the second belt are provided. The forward rotation pulley and the input pulley are attached to one end side of the first transmission shaft, and the helical shaft drive pulley for driving the drain spiral shaft of the Glen tank is connected to the other end side of the first transmission shaft. working vehicle according to any one of claims 1 attached 6. A fan support member for supporting the fan;
The fan support member is
A plate to which the fan shaft is mounted;
A pair of frames for supporting the plate and having both ends connected to the shroud of the fan,
The pair of frames as viewed from the direction of the rotation axis of the fan,
The work vehicle according to any one of claims 1 to 7 , wherein the work vehicle is constructed so as to be sandwiched between the first belt and the second belt so as to sandwich both belts.

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