TWI623448B - Working vehicle - Google Patents

Abstract

The present invention provides a work vehicle capable of spraying dust adhered to a filter portion of a cover disposed on the outer side of a radiator and preventing the engine from overheating. The work vehicle includes: a radiator (30) for cooling the cooling water of the engine (20); a cover (10a) having a filter unit disposed outside the radiator (30); and a single fan (40), Disposed between the engine (20) and the radiator (30); the aforementioned work vehicle is further provided with a first transmission path (W1), which transmits the power of the engine (20) to the fan (40) via the first belt (51) ) And make the fan (40) forward; the second transmission path (W2), the power of the engine (20) is transmitted to the fan (40) via the second belt (52), and the fan (40) is reversed; And a power switching mechanism (60) that switches the state of driving from the first transmission path (W1) to the fan (40) and the state of driving from the second transmission path (W2) to the fan (40).

Description

Work vehicle

The invention relates to a work vehicle.

Conventionally, working vehicles such as combine harvesters include a fan that draws in external air to a radiator that cools an engine installed in a prime mover for cooling, and a fan for dust exhaust that is disposed on the surface of the radiator or the radiator Swarf, dust, and the like adhered to the filter in front of the lens are sprayed (for example, refer to Patent Document 1).

[Prior technical literature]

[Patent Literature]

Patent Document 1: Japanese Patent Application Laid-Open No. 2015-189386.

However, in the above-mentioned conventional structure, the driving mechanism for rotating the cooling fan and the driving mechanism for rotating the dust exhaust fan are separately constituted, which results in an increase in the number of parts and a cost increase. In addition, the cooling fan and the dust exhaust fan are arranged side by side in the axial direction. Set so that the width in the axial direction becomes wider.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a work vehicle capable of achieving engine cooling and removal of rod chips, dust, and the like with a simple structure.

In order to solve the above problems, the present invention adopts the following technical structure.

That is, the work vehicle according to the first aspect includes an engine (20), a radiator (30) for cooling the cooling water of the engine (20), and a cover (10a) having the radiator (30). A filtering unit on the outer side; and a single fan (40) arranged between the engine (20) and the radiator (30); the work vehicle is further provided with a first transmission path (W1), and the engine (20) The power of the engine (20) is transmitted to the fan (40) through the first belt (51), and the fan (40) is rotated forward; and the second transmission path (W2), the power of the engine (20) is transmitted through the second belt ( 52) while transmitting to the fan (40) and reversing the fan (40); and provided with a power switching mechanism (60), the power switching mechanism (60) is switched from the first transmission path (W1) to The state of transmission of the fan (40) and the state of transmission from the second transmission path (W2) to the fan (40).

The invention described in claim 2 is based on claim 1, and is provided with a reverse transmission mechanism, which is arranged on the second transmission path (W2) and is composed of gears (61) that mesh with each other.

The invention described in the third aspect is based on the second aspect and is provided with a gear box (62) for storing the gears (61), and a first transmission shaft (71) and a first gear shaft (71) to be mounted on the gears (61). Two transmission shafts (72) protrude from the gear box (62) to the right side of the machine body.

The invention described in the fourth aspect is based on the third aspect, and includes: a tensioning mechanism (90) for selectively applying tension capable of power transmission to the first belt (51) and the second belt (52); An input pulley (82) that inputs power from the engine (20) and a forward rotation pulley (81) that drives the first belt (51) are mounted on the first transmission shaft (71); The second transmission shaft (72) is provided with a reversing pulley (83) for driving the second belt (52), and a rotation shaft (41) of the fan (40) is installed through the first belt (51) ) The forward rotation pulley (85) linked from the forward rotation pulley (81) and the reverse rotation pulley (86) linked from the reverse rotation pulley (83) via the second belt (52). .

The invention described in claim 5 is based on claim 4, and the tensioning mechanism (90) includes a tension roller (91) for selectively applying tension to the first belt (51) and the second belt (52); The work vehicle is provided with a tension roller moving mechanism (100), and the roller mechanism (100) moves the tension roller (91) to a neutral position, a forward rotation position, and a reverse position, and the neutral position is relative to the first belt (51). And a position where no tension is applied to the second belt (52), the forward rotation position is a position where tension is applied to the first belt (51), and the reverse position The position is a position where tension is applied to the aforementioned second belt (52) only.

According to the present invention, the power transmission mechanism (60) can switch the state of transmission from the first transmission path (W1) to the fan (40) and the state of transmission from the second transmission path (W2) to the fan (40). A single fan (40) disposed between the engine (20) and the radiator (30) is rotated forward and reversed. Thereby, the fan (40) is forwardly turned to blow air to the radiator (30) side. On the other hand, if the fan (40) is reversed, the cover (disposed on the outside of the radiator (40)) 10a) The swarf, dust and the like adhered to the filter part are sprayed. In this way, the structure can be simplified, and the engine (20) can be prevented from overheating.

1‧‧‧ combine harvester

2‧‧‧frame

3‧‧‧ Driving device

4‧‧‧ track

6‧‧‧ cab

7‧‧‧ Harvesting device

8‧‧‧ Grain Box

9‧‧‧ grain discharge spiral

10‧‧‧ Motive Department

10a‧‧‧ cover

20‧‧‧ Engine

30‧‧‧ Radiator

40‧‧‧ radiator fan

41‧‧‧rotation axis

42‧‧‧ Shroud

43‧‧‧Shaft

44‧‧‧bearing

50‧‧‧ Transmission Belt

51‧‧‧First Zone

52‧‧‧Second Zone

53‧‧‧ Third Band

54‧‧‧Fourth Band

60‧‧‧Power switching mechanism

61‧‧‧Gear

62‧‧‧Gearbox

71‧‧‧first drive shaft

72‧‧‧Second transmission shaft

73, 103a‧‧‧ output shaft

81‧‧‧Forwarding pulley

82‧‧‧Input pulley

83‧‧‧Reverse pulley

84‧‧‧Output pulley

85‧‧‧Forward rotation pulley

86‧‧‧Reverse pulley

87‧‧‧ Screw shaft drive pulley

88‧‧‧drive belt wheel

89‧‧‧ pulley for air conditioner drive

90‧‧‧ tensioning mechanism

91‧‧‧Roller (tension roller)

100‧‧‧ roller movable mechanism (tension roller moving mechanism)

101‧‧‧ support shaft

102‧‧‧ shaft

103‧‧‧Rotating body

104‧‧‧Motor

105‧‧‧arm body

106‧‧‧Packaging

107‧‧‧Spring

200‧‧‧compressor

210‧‧‧Air-conditioning passive pulley

400‧‧‧fan support member

410‧‧‧board

411a, 411b, 412a, 412b‧‧‧Mounting department

421, 422‧‧‧ frame

500‧‧‧tension roller

621‧‧‧ flange

622‧‧‧ box body

623‧‧‧First shaft storage section

624‧‧‧Second shaft storage

800‧‧‧first gearbox

801‧‧‧ bevel gear set

802‧‧‧axis

810‧‧‧Vibration shaft

820‧‧‧Second Gear Box

821‧‧‧Drive gear set

830‧‧‧bottom cam body

840‧‧‧Clutch

850‧‧‧Discharge screw shaft

860, 870‧‧‧with wheel

W1‧‧‧First transmission path

W2‧‧‧Second transmission path

R‧‧‧ radius

C‧‧‧ arc

FIG. 1 is a side view of a combine of a work vehicle as an embodiment.

FIG. 2 is a schematic explanatory view of a power switching mechanism in the combine of the same embodiment as viewed from above.

FIG. 3 is a schematic explanatory view of the power switching mechanism as viewed from the side.

FIG. 4 is an explanatory view showing a front view of a driving unit in the same combine.

FIG. 5 is an explanatory view showing a side view of a layout of a fan and a power switching mechanism of the combine in the same manner; FIG.

FIG. 6A is an illustration showing an example of the movement of the roller body of the tensioning mechanism Illustration.

FIG. 6B is an explanatory diagram showing an example of the movement of the roller body of the tensioning mechanism.

FIG. 7 is an explanatory diagram showing an arrangement example of a pulley for forward rotation and a pulley for reverse rotation with respect to the central axis of the fan.

FIG. 8 is a side view of a gear box included in the power switching mechanism.

9 is an explanatory diagram of a rear view of the gear box shown in FIG. 8.

FIG. 10 is a schematic explanatory view showing a modified example of a pulley provided in the power switching mechanism of the same.

An embodiment of the work vehicle of the present invention will be described in detail based on the drawings. In the following description, a combine is described as an example of a work vehicle. However, this embodiment does not limit the present invention, and can be implemented in various modifications without departing from the scope of the present invention.

In addition, the structural elements in the following embodiments are constituted by elements that can be replaced by ordinary knowledgeable persons in the technical field, or are elements that are substantially the same, that is, elements of the so-called equal range.

FIG. 1 is a side view of a combine harvester 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 use mode of the combine 1 will be described as the front-rear direction, left-right direction, and up-down direction of each part. That is, the front-back (X-axis) direction is In the longitudinal 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 them, the forward direction of the combine 1 during the harvesting operation is the left-hand direction toward the front, and the downward direction is the direction of gravity action. In addition, the aforementioned equal directions are simple definitions for easy understanding of the description, and the aforementioned equal directions do not limit the present invention.

<Overall Structure of Combine Harvester 1>

As shown in FIG. 1, the combine 1 includes a body frame 2, a traveling device 3 provided on a lower side of the body frame 2, a cab 6 provided on an upper front side of the body frame 2, and a front side of the cab 6. The lower harvesting device 7 and a threshing device (not shown) attached to the left side of the rear of the machine frame 2.

In addition, a grain tank 8 storing grains threshed and screened by the threshing device is provided on the right side of the threshing device behind the cab 6, and the stored grains are discharged to the outside through the grain discharge screw 9. The grain discharge screw 9 drives the screw shaft (refer FIG. 2) provided in the inside, and can discharge the grain stored in the grain tank 8 to the outside.

An engine compartment is provided on the lower right side of the cab 6 and houses a motive unit 10 having an engine 20 or the like as a power source. The engine room in which the motive unit 10 is housed is covered with a cover 10 a having a filter unit (filter unit).

The motive unit 10 accommodated in the engine room includes a radiator 30 (see FIG. 2) and a radiator fan (“fan” in the request) 40, which cools the cooling water of the engine 20, as described below; The power switching mechanism 60 (the "transmission state switching mechanism 60" in the request) is switched freely and the power is switched to the radiator fan 40 in two systems. The power switching mechanism 60 is a main part of the present embodiment, and will be described in detail later together with the configuration of the motive unit 10.

<Running Device 3>

The traveling device 3 is provided with a pair of left and right crawler tracks 4 that are orbited by the driving power from the engine 20. The combine 1 can travel on farmland through the crawler tracks 4.

<Cab 6>

The cab 6 provided on the upper front side of the body frame 2 functions as a control room, and includes a driver seat (not shown), various joysticks, instruments, and an operation panel, and a display capable of displaying various information. .

<Harvest device 7>

The harvesting device 7 is provided with a grass-dividing rod for dividing the grass rod of the farmland, a pull-up device for pulling up the grass rod, and a harvesting knife for cutting the roots of the pulled rod. The straw poles on the farmland are divided by the grass-dividing poles. The grass poles after the grass-dividing are pulled up by the pulling device, and the raised poles are picked by the harvesting knife. Reap.

<Motion Unit 10>

FIG. 2 is a schematic explanatory diagram of the power switching mechanism 60 of the combine harvester 1 in plan view, FIG. 3 is a schematic explanatory diagram of the side view of the power switching mechanism 60 of the combine harvester 1, and FIG. FIG. 5 is an explanatory diagram when viewed from the front. FIG. 5 is an explanatory diagram when the layout of the radiator fan 40 and the power switching mechanism 60 of the combine 1 is viewed from the side.

As shown in FIG. 2, a motive unit 10 provided in an engine room includes an engine 20 arranged so that an output shaft 73 faces a rightward direction with respect to a traveling direction of a body, and a radiator 30 on a right side of the engine 20 (left side in FIG. 2). ) Are arranged at predetermined intervals; and a single radiator fan 40 is disposed between the engine 20 and the radiator 30.

The radiator fan 40 rotates with the engine 20 as a driving source. However, in the combine harvester 1 of the present embodiment, the output shaft 73 of the engine 20 and the rotation shaft 41 of the radiator fan 40 are not directly connected, but are connected by a belt. Drive to link. That is, as shown in FIG. 3, the rotation 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, as a path for transmitting power from the engine 20 to the radiator fan 40, the prime mover 10 includes a first transmission of a first belt 51 that rotates the radiator fan 40 forward (for example, clockwise). Path W1 and Dispersion The heater fan 40 reverses (eg, counterclockwise) the second transmission path W2 of the second belt 52. In addition, the present embodiment includes a power switching mechanism 60 that selectively switches the first transmission path W1 and the second transmission path W2.

(Power Transmission Path)

Here, a power transmission path for transmitting power from the engine 20 of the combine 1 to the radiator fan 40 will be described mainly with reference to FIGS. 2 and 3. The aforementioned power transmission path is composed of a first transmission path W1 and a second transmission path W2.

As shown in FIG. 2, the combine 1 according to the present embodiment includes a gear box 62 that stores a pair of gears 61 (“reverse transmission mechanisms” in the claims) that mesh with each other. Among them, the gear 61 is selected as a flat gear.

The gear box 62 is disposed behind the lower part of the engine 20 (refer to FIG. 4). The gear box 62 is provided with a first transmission shaft 71 ("first transmission shaft" in the request) and a second transmission shaft that protrude outward. Transmission shaft 72 ("second transmission shaft" in the claim). The first transmission shaft 71 is connected to one of the pair of gears 61, and the second transmission shaft 72 is connected to the other gear 61. In this embodiment, the first transmission shaft 71 extends through the gear box 62 in the left-right direction, and the second transmission shaft 72 projects to the right side (left side in FIG. 2) of the gear box 62.

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

As shown in FIGS. 2 and 4, a reversing pulley 83 is attached to the front end of the second transmission shaft 72 located above the first transmission shaft 71.

A forward rotation pulley 85 is mounted on a front end portion (end portion on the engine 20 side) of the rotation shaft 41 of the radiator fan 40, and a reverse rotation pulley 86 is mounted at a predetermined distance from the forward rotation pulley 85. Close to the radiator fan 40.

The first belt 51 is stretched between the forward rotation pulley 81 attached to the first transmission shaft 71 of the gear box 62 and the forward rotation pulley 85 attached to the rotation shaft 41 of the radiator fan 40. A second belt 52 is stretched between the reversing pulley 83 of the second transmission shaft 72 mounted on the gear box 62 and the reversing pulley 86 of the rotation shaft 41 of the radiator fan 40.

That is, in the present embodiment, a forward rotation pulley 81 is mounted on the front end of the first transmission shaft 71, and an input pulley 82 is mounted on the gear box 62 side than the forward rotation pulley 81. The distance between the output pulley 84 provided on the output shaft 73 of the engine 20 and the forward rotation pulley 85 provided on the rotation shaft 41 of the radiator fan 40 is configured to be the forward rotation pulley 81 and the input belt in the Y-axis direction. The intervals of the wheels 82 are equal to form a first transmission having a transmission belt 50 and a first belt 51. Moving path W1 ("first transmission path W1" in the request).

The reversing pulley 83 attached to the second transmission shaft 72 is arranged closer to the radiator fan 40 side than the forward rotation pulley 81 attached to the front end of the first transmission shaft 71.

The interval between the reversing pulley 83 and the forward rotation pulley 81 is configured to be equal to the interval between the reversing pulley 86 and the forward rotation pulley 85 provided on the rotation shaft 41 of the radiator fan 40 in the Y-axis direction. A second transmission path W2 ("second transmission path W2" in the claim) is formed with the transmission belt 50, the first belt 51, and the second belt 52.

In this way, in the driving unit 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 arranged in this order from the inside of the body.

Therefore, the power switching mechanism 60 that can selectively switch the first transmission path W1 and the second transmission path W2 can be compactly configured as described later, and can be efficiently disposed in a limited space from the engine 20 to the radiator 30.

Furthermore, by making the power switching mechanism 60 in a compact configuration, as a result, the entire driving unit 10 can be effectively arranged in the engine room where the width of the combine 1 is limited, and the engine 20 and the radiator 30 The positional relationship does not need to be changed from the previous 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 and the input pulley 82 of the gear box 62, and the rotation shafts of the forward rotation pulley 81 and the radiator fan 40. 41 和 85。 Forward pulley 85. Therefore, as shown in FIG. 2, the power from the engine 20 is transmitted to the radiator fan 40 through the first transmission path W1, so that the output shaft 73 (output pulley 84) → the first transmission shaft 71 (input pulley 82) And the forward rotation pulley 81) → the rotation shaft 41 (forward rotation pulley 85) is transmitted, and the radiator fan 40 rotates forward.

In addition, the second transmission path W2 includes: an output shaft 73 and an output pulley 84 of the engine 20; a first transmission shaft 71 of the gear box 62, an input pulley 82, a pair of gears 61, a second transmission shaft 72, and a rotation direction; The pulley 83; and the rotating shaft 41 and the reverse pulley 86 of the radiator fan 40. Therefore, as shown in FIG. 2, the power from the engine 20 transmitted to the radiator fan 40 through the second transmission path W2 passes through the output shaft 73 (output pulley 84) → the first transmission shaft 71 (input pulley 82). → One gear 61 → the other gear 61 → the second transmission shaft 72 (reversing pulley 83) → the rotation shaft 41 (reversing pulley 86), and the radiator fan 40 reverses.

As described above, in the combine 1 of the present embodiment, by turning the single radiator fan 40 forward or reverse, the cover 10a covering the cooling of the engine 20 and the surface of the radiator 30 and the engine room can be removed (FIG. 1). Rod dust, dust, etc. attached to the filter part of

As shown in FIG. 5, 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.

That is, as shown in FIGS. 4 and 5, the fan support member 400 includes a plate 410 on which the shaft portion 43 of the radiator fan 40 is mounted, and a plate 410 that supports and supports the plate 410 and has both ends connected to the radiator fan 40. A pair of frames 421 and 422 of the shroud 42. In FIG. 4, reference numeral 44 denotes a bearing 44, and a 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 formed flat, respectively. In a word shape, each end portion is connected to the shroud 42. At this time, the two frames 421 and 422 are erected in a figure-shaped configuration that gradually opens downward along the direction in which the first belt 51 and the second belt 52 are stretched.

The board 410 includes a mounting portion 411 a, a mounting portion 411 b, a mounting portion 412 a, and a mounting portion 412 b extending in four directions, and the front end portions are connected to the frames 421 and 422. As shown in the figure, the mounting portions 411a, 411b, 412a, and 411b are formed so as to correspond to a pair of frames 421 and 422 arranged in a zigzag shape, and the mounting portions 411a and 412a are positioned higher in the height direction. In comparison, the lower mounting portions 411b and 412b are relatively long.

In this way, the radiator fan 40 is passed through the fan support structure of the above-mentioned structure. The component 400 is attached to the shroud 42. Therefore, the belt replacement operation of attaching or detaching the first belt 51 and the second belt 52 can be easily performed, and workability can be improved.

<Power Switching Mechanism 60>

Next, the power switching mechanism 60 will be described. The power switching mechanism 60 selectively switches the first transmission path W1 and the second transmission path W2, and is provided with a tensioning mechanism 90 on any one of the first belt 51 and the second belt 52. The tensioning mechanism 90 is selective. A tension is applied to generate a force that reliably rotates the radiator fan 40.

As shown in FIGS. 2 and 3, the tensioning mechanism 90 includes a roller body (“tension roller” in the claim) 91 disposed between the first belt 51 and the second belt 52. As shown in FIG. 2, the first belt 51 and the second belt 52 are provided with a distance in the body width direction of the forward rotation pulley 81 and the forward rotation pulley 85, the reverse rotation pulley 83, and the reverse rotation pulley 86. Interval.

Therefore, for the roller body 91, at least the width of the first belt 51, the width of the second belt 52, and the interval between the first belt 51 and the second belt 52 are formed to have a size equal to or larger than the width to which they are added. As shown in FIGS. 3 and 5, the roller body 91 is linked to a roller movable mechanism (“tension roller moving mechanism” in the claim) 100 in an interlocking manner.

<Roll movable mechanism 100>

As shown in FIG. 3 and FIG. 5, the roller movable mechanism 100 includes a rod body 102 having a roller body 91 mounted on one end and swinging about the support shaft 101 as a center, and a rotating body for swinging the rod body 102 around the support shaft 101. 103; and a motor 104 as a driving unit that rotates the rotating body 103.

The rotating body 103 is connected to the output shaft 103a of the package 106. The package 106 is used to store gears and the like connected to the output shaft (not shown) of the motor 104 at the center of the rotating body 103. The end sides are respectively connected to the base ends of the arm bodies 105.

Further, a proximal end of a spring 107 that respectively connects the distal end to the lever body 102 is connected to the distal end of the arm body 105. The front ends of the two springs 107 are connected to each other with the support shaft 101 interposed therebetween. According to the aforementioned structure, if the motor 104 rotates forward or reverse, one of the springs 107 is stretched and the other of the springs 107 is relaxed. Therefore, the lever body 102 swings about the support shaft 101.

If the lever body 102 swings about the support shaft 101, as shown in the figure, the roller body 91 attached to the front end of the lever body 102 can press either one of the first belt 51 or the second belt 52, and can be selectively applied and generated. The tension of the force corresponding to rotating the radiator fan 40.

6A and 6B are explanatory diagrams showing an example of the movement of the roller body 91 of the tensioning mechanism 90. In addition, although illustration is omitted, it is preferable that the roller body 91 is formed on the outer surface of the roller body 91 to form a pair with the first belt 51 and the second belt 52. Appropriate grooves, etc.

As shown in FIG. 6A, in the case where tension is applied to the first belt 51 using the roller body 91, that is, when the radiator fan 40 is rotated forward, the lever body 102 swings to move the roller body 91 downward. On the other hand, as shown in FIG. 6B, when tension is applied to the second belt 52, that is, when the radiator fan 40 is reversed, the lever body 102 swings to move the roller body 91 upward.

In this way, the roller body 91 is moved to the neutral position where no tension is applied to either the first belt 51 or the second belt 52 by the roller movable mechanism 100 (FIG. 6A (a), FIG. 6B (a)), and only the first position The forward rotation position (FIG. 6A (c)) where the belt 51 abuts, and the reverse rotation position (FIG. 6B (c)) which abuts only the second belt 52 are moved. Therefore, the selective switching of the first transmission path W1 and the second transmission path W2 can be reliably performed by the roller movable mechanism 100 having a single roller body 91 and having a simple and low-cost configuration.

When the roller body 91 is swung, the rotation speed of the motor 104 can be appropriately reduced. That is, since the movement of the roller body 91 is slower than that of the motor 104 rotating at high speed, if one of the first belt 51 or the second belt 52 is loosened, the tension of the other belt increases. Therefore, for example, the forward-moving radiator fan 40 starts to decelerate, and then gradually increases its speed in the reverse direction, so the sliding sound of the first belt 51 (the second belt 52) is also controllably suppressed to improve the quietness.

In addition, for example, from the state shown in FIG. 6A to the state shown in FIG. 6B When the roller body 91 is actuated in such a state or in the opposite state, when the roller body 91 moves away from the first belt 51 and the second belt 52, a reaction force from the belt (the first belt 51, the second belt 52) is generated. Therefore, the result will help the driving force of the motor 104. Therefore, if the roller movable mechanism 100 of the present embodiment is configured, even if the motor 104 is relatively small, the first transmission path W1 and the second transmission path W2 can be smoothly switched.

(other)

In addition, as shown in FIG. 7, the forward rotation pulley 81 and the reverse rotation pulley 83 can be disposed on an imaginary 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 rotation shaft 41 of the radiator fan 40. FIG. 7 shows 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.

In this way, the first belt 51 and the second belt 52 are arranged on the imaginary arc C having a radius R from the rotation axis 41 of the radiator fan 40 by arranging the forward rotation pulley 81 and the reverse rotation pulley 83. The degree of loosening and stretching of the tension will not become unbalanced. Therefore, it is possible to reliably switch the first transmission path W1 and the second transmission path W2 (see FIG. 2) for transmitting the power from the engine 20 to the radiator fan 40 by one roller body 91. In addition, the first belt 51 and the second belt 52 can be used in common, and cost reduction can be achieved.

The number of blades of the radiator fan 40 shown in FIGS. 3 and 7 is seven. As opposed to eight in the example shown in FIG. 7. That is, the number of blades of the radiator fan 40 is not particularly limited, and the size can be appropriately determined in consideration of the air supply capacity and the like.

In addition, as shown in FIG. 2, the combine harvester 1 of the present embodiment is provided with a forward rotation pulley 81 and an input pulley on one end side of the first transmission shaft 71, that is, a portion extending from the gear box 62 to the right side of the machine body. 82. On the other hand, on the other end side, that is, a portion extending from the gear box 62 to the left side of the body, a screw shaft driving pulley 87 for driving a discharge screw shaft 850 of the grain box 8 (see FIG. 1) is installed.

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

That is, a first gear box 800 accommodating the bevel gear set 801 is provided between the gear box 62 and the discharge screw shaft 850, and a transmission belt wheel 88 is mounted on one of the shafts 802 connected to the bevel gear set 801. A third belt 53 is stretched from the helical shaft driving pulley 87. In addition, a tensioning clutch 840 for turning on and off the third belt 53 is provided between the transmission pulley 88 and the screw shaft driving pulley 87.

A base end of the vibration shaft 810 is connected to the other side of the bevel gear set 801, and the front end of the vibration shaft 810 is linked to the base end of the discharge screw shaft 850 via the second gear box 820. In addition, inside the second gear box 820 The section accommodates, for example, a transmission gear set 821 to which a plurality of flat gears mesh. In addition, a bottom cam body 830 for striking the grain tank 8 is provided on the vibration shaft 810.

As described above, in the combine harvester 1 of the present embodiment, in addition to the normal rotation and reverse rotation of the radiator fan 40, the discharge screw shaft 850 of the grain discharge screw 9 can be driven.

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

Therefore, in the combine 1 of the present embodiment, with a simple structure provided with a gear box 62, not only can an increase in cost be suppressed, but also the forward rotation and reverse rotation of the radiator fan 40 can be performed, and in addition to the valley In addition to the drive of the discharge screw shaft 850 of the pellet discharge screw 9, the air conditioner compressor 200 may be driven.

Here, the configuration of the gear box 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 box 62, and FIG. 9 is an explanatory diagram when the gear box 62 shown in FIG. 8 is viewed from the rear.

As shown in the figure, the gear box 62 is formed with a flange 621 for attachment to the body side at a base portion, and an oblong box body 622 extending obliquely upward from the base portion at an angle of approximately 45 ° is formed.

As shown in FIG. 9, the box main body 622 bulges a relatively short first shaft accommodating portion 623 accommodating the first transmission shaft 71 in the lower portion of the box, and a relatively long second shaft accommodating the second transmission shaft 72. The accommodating part 624 is bulged and formed in the upper part of the box. Further, a pair of gears 61 made up of meshing flat gears are housed on the side of the box body 622 close to the helical shaft drive pulley 87 and the air-conditioning drive pulley 89.

By using the gear box 62 of the aforementioned structure as the power switching mechanism 60, switching between the first transmission path W1 and the second transmission path W2 becomes easy, and the forward rotation of the radiator fan 40 can be selectively performed with a simple structure. Or reversely, driving of the discharge screw shaft 850 and driving of the air conditioner are performed.

According to the embodiment described above, the following combine harvester 1 can be realized.

(1) The combine 1 includes: an engine 20 as a drive source; a 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; The path of the power transmission from the engine 20 to the radiator fan 40 is selectively switched so that The power transmission mechanism 60 of the first transmission path W1 of the first belt 51 where the radiator fan 40 rotates forward and the second transmission path W2 of the second belt 52 which reverses the radiator fan 40.

(2) In the structure of the combine (1) described in (1) above, the power switching mechanism 60 includes a gear box 62 that houses a pair of gears 61 that mesh with each other, and projects from the gear box 62 and is connected to one of the pair of gears 61 A first transmission shaft 71 and a second transmission shaft 72 connected to the other of the pair of gears 61; a forward rotation pulley 81 mounted on the first transmission shaft 71, and an input for inputting power from the engine 20 Pulley 82; reversing pulley 83 mounted on second transmission shaft 72; output shaft 73 mounted on engine 20, output pulley 84 linked to input pulley 82 via transmission belt 50; provided on radiator fan 40 A forward rotation pulley 85 linked to the forward rotation pulley 81 via the first belt 51; a reverse rotation pulley 86 provided to the radiator fan 40 and linked to the reverse rotation pulley 83 via the second belt 52; And, optionally, a tension is applied to any one of the first belt 51 and the second belt 52 to transmit power for rotating the radiator fan 40.

(3) In the structure of the combine (1) described in (2) above, the tensioning mechanism 90 is disposed between the first belt 51 and the second belt 52, and is provided on either of the first belt 51 and the second belt 52. A roller body 91 that applies tension to transmit power for rotating the radiator fan 40.

(4) The combine 1 is provided with the roller body 91 in the structure of said (3). Moving between a neutral position where no tension is applied to either the first belt 51 or the second belt 52, 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 Roller movable mechanism 100.

(5) In the structure of the combine (1) described in (4) above, the roller movable mechanism 100 includes a rod body 102 attached to one end and swinging freely about the support shaft 101 as a center; and the rod body 102 is supported around the support body. A rotating body 103 with which the shaft 101 swings; and a driving portion 104 that rotates the rotating body 103.

(6) The combine 1 is configured in any one of the above (2) to (5), and the forward rotation pulley 81 and the reverse rotation pulley 83 are arranged on the rotation shaft 41 of the radiator fan 40 as The imaginary arc C in the center.

(7) The combine 1 is provided with any one of the structures (2) to (6) above, and a forward rotation pulley 81 is installed at the front end of the first transmission shaft 71. The forward rotation pulley 81 is closer to the gear box than the forward rotation pulley 81. The input belt 82 is mounted on the 62 side.

(8) In the structure of the combine (1) described in (7) above, the reversing pulley 83 mounted on the second transmission shaft 72 is arranged to be offset from the forward rotation pulley 81 mounted on the front end of the first transmission shaft 71. On the side of the radiator fan 40, a transmission belt 50, a first belt 51, and a second belt 52 are provided in this order from the inside of the body.

(9) The combine 1 is provided with any one of the structures (2) to (8) above, and a forward rotation pulley 81 and an input pulley 82 are mounted on one end side of the first transmission shaft 71. On the other hand, a screw shaft driving pulley 87 is mounted on the other end side of the first transmission shaft 71 to drive the discharge screw shaft 850 of the grain box 8.

(10) The combine harvester 1 in any one of the structures (2) to (9) above, includes a fan support member 400 that supports the radiator fan 40, and the fan support member 400 includes a shaft portion 43 to which the radiator fan 40 is mounted. The plate 410 and a pair of frames 421 and 422 supporting the plate 410 and connected at both ends thereof to the shroud 42 of the radiator fan 40 are respectively viewed from the rotation axis direction of the radiator fan 40, and the pair of frames 421 and 422 The first belt 51 and the second belt 52 are stretched in the direction in which the first belt 51 and the second belt 52 are interposed therebetween.

<Modifications>

In the above-mentioned embodiment, independent pulleys are used for the pulleys constituting the first transmission path W1 and the second transmission path W2. However, for example, as shown in FIG. 10, it is possible to use a double-connected pulley 860 instead of the forward rotation pulley 81 and the input pulley 82 provided in parallel with the first transmission shaft 71 provided in the gear box 62. FIG. 10 is a schematic explanatory view showing a modified example of a pulley included in the power switching mechanism 60.

In addition, instead of the normal rotation pulley 85 and the reverse rotation pulley 86 provided on the rotation shaft 41 of the radiator fan 40, a two-connected pulley 870 can also be used. In this way, the number of parts is reduced and the cost is reduced by using the two-combined wheel 860 (870).

In the above-mentioned embodiment, the forward pulley 85 and the reverse pulley 86 have the same diameter, but they may have different diameters.

In the above-described embodiment, the pair of gears 61 housed in the gear box 62 is a flat gear, 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.

Those skilled in the art can easily derive other effects and modifications. Therefore, the broader aspect of the present invention is not limited to the specific details and representative embodiments described above. Therefore, as long as it does not exceed the spirit or scope of the concept of all the inventions defined by the technical solution of the present application and its equivalent technical features, various changes can be made.

Claims (3)

A work vehicle comprising: an engine (20); a radiator (30) for cooling the cooling water of the engine (20); and a cover (10a) having a filter section disposed outside the transmission radiator (30); And a single fan (40) disposed between the engine (20) and the radiator (30); the work vehicle is further provided with a first transmission path (W1), and the power of the engine (20) is passed through the first The belt (51) is transmitted to the fan (40), and the fan (40) is forwardly rotated; the second transmission path (W2) transmits the power of the engine (20) to the foregoing through the second belt (52) A fan (40) and inverting the fan (40); a power switching mechanism (60), the power switching mechanism (60) switches a state of driving from the first transmission path (W1) to the fan (40), and from A state in which the second transmission path (W2) is transmitted to the fan (40); a reverse transmission mechanism is provided in the second transmission path (W2) and is composed of gears (61) that mesh with each other; and a gear box (62) ) For storing the aforementioned gears (61); a first transmission shaft (71) and a second transmission to be mounted on each of the aforementioned gears (61) The shaft (72) protrudes from the gear box (62) to the right side of the machine body. The work vehicle according to claim 1, wherein the first transmission shaft (71) is provided with an input pulley (82) that inputs power from the engine (20) and a drive unit that drives the first belt (51). The forward rotation pulley (81); the second transmission shaft (72) is provided with a reverse rotation pulley (83) that drives the second belt (52); and a rotation shaft (60) of the fan (40) 41) A forward rotation pulley (85) interlocked from the forward rotation pulley (81) via the first belt (51) and a reverse rotation pulley (via the second belt (52)) 83) An interlocking reversing pulley (86); and a tensioning mechanism (90) for selectively applying tension capable of power transmission to the first belt (51) and the second belt (52) . The work vehicle according to claim 2, wherein the tensioning mechanism (90) includes a tension roller (91) that selectively applies tension to the first belt (51) and the second belt (52); the work vehicle It also includes a tension roller moving mechanism (100), which moves the tension roller (91) to a neutral position, a forward rotation position, and a reverse rotation position; the neutral position is for the first belt (51) ) And the second belt (52) where no tension is applied; the forward rotation position is a position where tension is applied only to the first belt (51); the reverse position is a position where only the second belt (52) is applied The position of tension.