JP2012245914A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem in which cooling efficiency is deteriorated due to providing of a transmission for a fan for cooling within a blowing range of the fan.SOLUTION: This working vehicle includes a continuously variable transmission 11 for traveling for driving a travel device 2 by continuously shifting driving rotation of an engine 10. The fan 20 for cooling, a radiator 21 and a dustproof net 37 are provided outside the engine 10. The fan 20 is driven to normally rotate and reverse by a continuously variable transmission 30 for a fan. In the continuously variable transmission 30, the driving rotation of the engine 10 is inputted via a pump input shaft 14 for traveling of the continuously variable transmission 11.

Description

  The present invention relates to a work vehicle, particularly, a combine.

Conventionally, a radiator cover with an engine cooling fan and a dust-proof net has been installed outside the engine, and the cooling fan rotates forward by changing the contact position between the two tension pulleys and the fan belt. The configuration for switching to reverse rotation is known (Patent Document 1).
Conventionally, a configuration in which an engine cooling fan is provided on the output shaft of a fan continuously variable transmission and switched between forward rotation and reverse rotation by the fan continuously variable transmission is known (Patent Document 2).

JP 11-36754 A JP 2008-87723 A

In the former configuration of the known examples, the rotation of the cooling fan is switched between forward rotation and reverse rotation by changing the contact position between the two tension pulleys and the fan belt. There are issues such as.
In addition, if the rotation speed of the cooling fan relative to the engine output rotation speed cannot be changed and a load is applied to the engine and the output rotation of the engine decreases, the rotation speed of the cooling fan also decreases accordingly. There is a problem that the cooling efficiency by the cooling fan deteriorates.
Among the known examples, in the latter configuration, the cooling fan is provided on the output shaft of the fan continuously variable transmission, and the fan continuously variable transmission is switched between forward rotation and reverse rotation. The fan continuously variable transmission will be provided within the cooling fan blowing range between the cooling fan and the engine, and the fan continuously variable transmission becomes the resistance of the cooling fan blowing and the cooling efficiency is low. There are challenges.
In the present application, the rotation mechanism of the cooling fan is devised to easily remove deposits on the dust-proof net of the radiator cover and improve the cooling efficiency.

The invention according to claim 1 includes a continuously variable transmission 11 for traveling that drives the traveling device 2 by continuously changing the driving rotation of the engine 10, and a cooling fan 20 is provided outside the engine 10. A radiator 21 and a dust-proof net 37 are provided, and the cooling fan 20 is driven forward and reversely by a fan continuously variable transmission 30. The fan continuously variable transmission 30 includes The working vehicle is characterized in that the driving rotation of the engine 10 is input via the traveling pump input shaft 14 of the step transmission 11 and normally the driving rotation of the engine 10 is continuously variable for traveling. The transmission is transmitted to the fan continuously variable transmission 30 via the traveling pump input shaft 14 of the transmission 11, and the speed is changed by the fan continuously variable transmission 30 to drive the cooling fan 20 to rotate forward. By blowing into the body inside direction, cooling the engine 10. On the other hand, when the fan continuously variable transmission 30 is reversely rotated and the cooling fan 20 is reversely rotated, air is blown from the inside of the machine body to the outside of the machine body, and the deposits on the dust-proof net 24 of the radiator cover 22 are removed.
The invention according to claim 2 is provided with an input pulley 15 for inputting the driving rotation of the engine 10 at the inner end of the traveling pump input shaft 14 protruding from the case 33 of the traveling continuously variable transmission 11 to the inside of the machine body, The outer end of the traveling pump input shaft 14 is extended from the case 33 to the outside of the machine body, and the drive rotation is performed from the outer end of the traveling pump input shaft 14 toward the fan hydraulic pump 31 of the fan continuously variable transmission 30. The traveling pump input shaft 14 is configured to output an intermediate output pulley 35 that outputs driving rotation toward the fan hydraulic pump 31 or a fan hydraulic pump 31 of the fan continuously variable transmission 30. A working vehicle characterized in that a coupling mechanism 61 connected to the input shaft 46 is provided, and a continuously variable transmission for traveling that protrudes inward from the case 33. The driving rotation from the engine 10 is input to the inner end of the traveling pump input shaft 14 and the output rotation of the outer end of the traveling pump input shaft 14 that protrudes outside the case 33 is input to the continuously variable transmission 30 for the fan. When it is transmitted to the fan hydraulic pump 31 by the intermediate output pulley 35 or the coupling mechanism 61 and the cooling fan 20 is driven to rotate forward by the fan continuously variable transmission 30, the engine 10 is cooled and the fan continuously variable transmission is performed. When the device 30 is reversely rotated, the cooling fan 20 is reversely rotated to remove the deposits on the dust-proof net 24 of the radiator cover 22.
According to a third aspect of the present invention, the fan rotation shaft 40 of the cooling fan 20 is rotatably supported by a pump input shaft 42 of a water pump 41 that circulates cooling water provided on the outer side of the engine 10 to cool the cooling fan 20. In the forward rotation state in which the fan 20 blows air from the outside to the inside of the dust-proof net 37, the working vehicle is characterized in that the rotation direction of the fan rotation shaft 40 and the rotation direction of the pump input shaft 42 coincide with each other. Therefore, the driving rotation of the fan hydraulic pump 31 of the fan continuously variable transmission 30 is transmitted to the fan rotating shaft 40 to rotate the cooling fan 20 forward and backward.
The fan rotation shaft 40 is supported by the pump input shaft 42 of the water pump 41 and rotates. When the cooling fan 20 is rotating forward, the rotation direction of the fan rotation shaft 40 matches the rotation direction of the pump input shaft 42. .
According to a fourth aspect of the present invention, the control unit 6 is provided above the engine 10, and the continuously variable transmission 30 for the fan is disposed in a space below the step 63 of the control unit 6. The driving rotation of the engine 10 is input to the traveling pump input shaft 14 of the traveling continuously variable transmission 11, and the rotation input to the traveling pump input shaft 14 of the traveling continuously variable transmission 11 is It is input to the fan hydraulic pump 31 of the fan continuously variable transmission 30 disposed in the space below the step 63 of the control unit 6 on the side of the traveling continuously variable transmission 11. The cooling fan 20 is rotated forward to cool the engine 10, or the cooling fan 20 is rotated backward to remove deposits on the dust-proof net 24 of the radiator cover 22.
In the fifth aspect of the present invention, the belt 45 is wound around the output pulley 44 of the fan hydraulic motor 32 of the fan continuously variable transmission 30 and the input pulley 43 of the fan rotating shaft 40, A trunnion shaft 71 for shifting the fan hydraulic pump 31 is provided on the surface of the fan continuously variable transmission 30 opposite to the fan rotation shaft 40 in the axial direction of the output shaft 47. The fan continuously variable transmission 30 is shifted by rotating the trunnion shaft 71, and the rotation of the fan hydraulic motor 32 of the fan continuously variable transmission 30 is shifted from the output pulley 44 to the fan rotation shaft. 40 is transmitted to the input pulley 43 via the belt 45, and the cooling fan 20 is rotated forward and backward.

According to the first aspect of the present invention, the radiator 21 and the engine 10 are cooled by switching the rotation direction of the cooling fan 20 between the forward rotation state and the reverse rotation state by the fan continuously variable transmission 30, and the radiator cover. 22 can be removed, and the driving rotation of the engine 10 is transmitted to the continuously variable transmission 30 for the fan via the continuously variable transmission 11 for traveling. Therefore, the belt transmission around the engine 10 is transmitted. The configuration can be simplified and maintenance work can be facilitated.
According to the second aspect of the present invention, the signal is input from the inner end of the traveling pump input shaft 14 of the traveling continuously variable transmission 11 inside the case 33 and is output from the outer end of the traveling pump input shaft 14 outside the case 33. Since the driven rotation thus transmitted is transmitted to the fan hydraulic pump 31 of the fan continuously variable transmission 30, the rotation transmission configuration can be simplified and maintenance work can be facilitated.
According to the third aspect of the present invention, since the fan rotation shaft 40 of the cooling fan 20 is supported by being supported by the pump input shaft 42 of the water pump 41, the configuration can be rationally simplified, and the cooling fan At the time of 20 forward rotation, the rotation direction of the fan rotation shaft 40 and the rotation direction of the pump input shaft 42 are matched, so that durability can be improved.
According to the fourth aspect of the present invention, the fan continuously variable transmission 30 can be installed by effectively utilizing the space below the step 63 of the control unit 6.
In the fifth aspect of the invention, since the trunnion shaft 71 is provided on the opposite side to the belt 45, adjustment, setting work and maintenance work can be facilitated.

The side view of a combine. The rear view which showed the outline of the power transmission mechanism of the cooling fan. FIG. FIG. The same side view. The rear view of the other Example of the transmission mechanism of a cooling fan. The same side view. FIG. The partial top view of a control part. The schematic diagram which shows the change of traveling speed. Schematic diagram of transmission path mechanism. Schematic which showed the reverse mechanism of a supply conveyance chain.

An embodiment of the present invention will be described with reference to the drawings. 1 is a combiner body frame, 2 is a traveling device, 3 is a threshing device provided on one side of the traveling device 2, 4 is a reaping device, and 5 is a threshing device 4. A Glen tank 6 provided on the side is a control unit.
The traveling device 2 is configured to be driven and rotated by a traveling continuously variable transmission (HST) 11 that changes the driving rotation of the engine 10 steplessly. The traveling continuously variable transmission 11 includes a hydraulic pump 12 and It has a hydraulic motor 13. An input pulley 15 is provided on the traveling pump input shaft 14 of the hydraulic pump 12. A belt 18 is wound around the input pulley 15 and an inner output pulley 17 of an engine output shaft 16 provided inside the engine 10. The travel continuously variable transmission 11 transmits the output rotation of the hydraulic motor 13 to a mission (mission case) 19 to drive the travel device 2 although not shown.
The engine 10 is provided near the lower side (rear side) of the driver's seat 7 of the control unit 6, and an engine cooling fan 20 is provided on the outer side (right side) of the engine 10 (FIG. 2). A radiator 21 is provided outside the cooling fan 20, and the radiator cover 22 is provided outside the radiator 21. A dust-proof net 24 is provided in the opening 23 provided in the radiator cover 22.

The cooling fan 20 is rotated in the forward and reverse directions by a fan continuously variable transmission (HST) 30 that continuously changes the drive rotation of the engine 10. The fan continuously variable transmission 30 includes a fan hydraulic pump 31 and a fan hydraulic motor 32.
The continuously variable transmission 30 for a fan is configured to receive driving rotation from the traveling pump input shaft 14 of the continuously variable transmission 11 for continuously shifting the traveling device 2, and the continuously variable transmission 11 for traveling. The rotation from the traveling pump input shaft 14 extended outward from the hydraulic pump 12 is transmitted.
The traveling pump input shaft 14 of the traveling continuously variable transmission 11 is provided with the input pulley 15 for inputting rotation from the engine 10 at one end (inner end) protruding inward from the case 33, and outside the case 33. A configuration in which the other end (outer end) of the traveling pump input shaft 14 is extended and rotated and outputted from the outer projecting portion of the traveling pump input shaft 14 toward the fan hydraulic pump 31 of the fan continuously variable transmission 30. And

That is, the traveling pump input shaft 14 of the traveling continuously variable transmission 11 is provided with the input pulley 15 at one end 14A of the traveling pump input shaft 14, and the intermediate portion of the traveling pump input shaft 14 is the traveling continuously variable transmission. The other end 14B of the traveling pump input shaft 14 is extended outward from the hydraulic pump 12 (case 33) and protrudes through the case 33 of the device 11, and is intermediate to the other end 14B of the traveling pump input shaft 14. An output pulley 35 is provided, and a belt 37 is wound around the intermediate output pulley 35 and the input pulley 36 of the fan hydraulic pump 31.
Therefore, since rotation is input to the fan hydraulic pump 31 of the fan continuously variable transmission 30 using the rotation transmission mechanism that transmits to the traveling continuously variable transmission 11, the belt transmission configuration around the engine 10 is simplified. Make maintenance work easier.
Since the rotation transmission to the fan continuously variable transmission 30 can be performed by the single belt 37, the configuration is simplified and the maintenance work is facilitated also in this respect.

The fan rotation shaft 40 of the cooling fan 20 is rotatably mounted in a double-axis state on a pump input shaft 42 of a water pump 41 that circulates cooling water provided at a predetermined position of the engine 10. . An input pulley 43 is provided on the fan rotation shaft 40 of the cooling fan 20, and a belt 45 is wound around the output pulley 44 from which the rotation of the fan hydraulic motor 32 is output.
Therefore, the fan continuously variable transmission 30 is provided at a position off the axis of the fan rotation shaft 40 mounted on the engine 10 and is installed outside the blowing range of the cooling fan 20 (FIG. 4).
In this case, in the normal rotation state where the cooling fan 20 blows air from the outside to the inside of the dust-proof net 37, the rotation direction of the fan rotation shaft 40 and the rotation direction of the pump input shaft 42 are matched.

Further, the fan rotation shaft 40 and the pump input shaft 42 are arranged in the upper and lower sides and the left and right middle in the side view of the engine 10, and when the fan continuously variable transmission 30 is mounted at a predetermined position on the outer periphery of the engine 10, Installation is out of range.
Further, when a fan continuously variable transmission 30 is provided between the front side of the engine 10 and the transmission case 19 (FIG. 5), the cooling fan 20 can be removed from the air blowing range and the belt 37 from the transmission case 19 can be arranged. And the maintenance of the fan continuously variable transmission 30 is facilitated.
46 is an input shaft of the fan hydraulic pump 31, 48 is an output gear 48 provided on the output shaft 47 of the fan hydraulic motor 32, 49 is an intermediate shaft 49, 50 is an intermediate gear 50 fixed to the intermediate shaft 49, 51 is an output The shaft 52 is an input pulley 52, 54 for inputting the rotation of the engine 10 provided on the pump input shaft 42 of the water pump 41, the output pulleys 54, 55 provided on the output shaft 53 of the engine 10 is a belt, and 56 is a generator input. It is a pulley.

Therefore, the water pump 41 and the cooling fan 20 are supported by the same axis, and the supporting structure of the water pump 41 and the cooling fan 20 is also used.
FIG. 6 shows another embodiment of the continuously variable transmission 30 for the fan. The input pulley 15 is provided at one end 14A inside the traveling pump input shaft 14 of the traveling continuously variable transmission 11, and the traveling continuously variable transmission The other end 14 </ b> B of the traveling pump input shaft 14 that protrudes by extending through the case 33 of the transmission 11 and the input shaft 60 of the fan hydraulic pump 31 of the fan continuously variable transmission 30 are concentric. The other end 14 </ b> B of the traveling pump input shaft 14 of the traveling continuously variable transmission 11 is connected to the input shaft 60 by a coupling mechanism 61.
Therefore, rotation is input to the fan hydraulic pump 31 of the fan continuously variable transmission 30 using a rotation transmission mechanism that transmits to the continuously variable transmission 11 for traveling. Since the rotation of the pump input shaft 14 is transmitted to the fan hydraulic pump 31 of the fan continuously variable transmission 30 without using a belt, the transmission configuration is simplified and maintenance work is facilitated.

The fan rotation shaft 40 of the cooling fan 20 is rotatably fitted in a double shaft state to a pump input shaft 42 of a water pump 41 that circulates cooling water provided at a predetermined position of the engine 10. Disguise.
Therefore, also in this respect, the transmission configuration is simplified and maintenance work is facilitated.
In addition, when the fan continuously variable transmission 30 is provided in the space below the step 63 of the control unit 6 so as to face the opening 70 (FIGS. 1 and 7), the distance from the cooling fan 20 is short, and the space Can be used effectively.
The trunnion shaft 71 and the trunnion arm 72 for shifting the fan hydraulic pump 31 of the fan continuously variable transmission 30 are provided on the opposite side of the belt 45 to which the rotation of the fan hydraulic motor 32 is transmitted (FIG. 7).
The output of the fan continuously variable transmission 30 performs forward / reverse switching control every predetermined time. For example, the fan continuously variable transmission 30 is set to output a reverse rotation for 10 seconds after continuing the normal rotation output for 5 minutes, and repeatedly switching between the normal rotation output and the reverse rotation output. The set time for the forward rotation output and the reverse rotation output is changed according to.

Thus, the traveling device 2 travels by controlling the traveling continuously variable transmission 11 with a speed adjusting mechanism (not shown) by the main transmission lever 80 provided in the control unit 6 (FIG. 9).
In this case, the control unit 6 is provided with a slow speed mode switch 82, and the slow speed mode switch 82 is used to turn on and off the slow speed mode of the speed adjusting mechanism.
In the fine speed mode, the traveling speed is set to be lower than the minimum vehicle speed set by the speed setting dial 83 for setting the speed in the operation by the main speed change lever 80.
For this reason, it is possible to easily load and unload vehicles, cross over a ridge, and the like.
The S line in FIG. 10 indicates the traveling speed in the road traveling, the F line indicates the maximum speed setting speed increase in the working speed, the L line indicates the minimum speed setting speed increase in the working speed, and the B line. Indicates the traveling speed in the slow speed mode.
The cereal supply / conveyance device 85 that conveys and supplies the cereal to the threshing device 3 is configured to reverse the rotation of the cereal supply / conveyance device 85 at a low speed by an emergency switch (not shown) provided at a predetermined position (see FIG. 11, FIG. 12).

In other words, the cereal supply and transport device 85 normally feeds and transports the cereal from the start end side to the end point side of the threshing device 3, but the emergency switch (not shown) provided at a predetermined position in an emergency. When operated, the supply conveyance chain 87 is reversed and the movement direction is moved from the end side to the start side.
Therefore, the foreign matter sandwiched between the supply and conveyance chains 87 can be quickly removed.
A reversing mechanism 88 for reversing the supply / conveyance chain 87 is provided in the rotation transmission path of the grain supply / conveyance device 85. The reverse rotation mechanism 88 includes an input shaft 90 mounted on a gear case 89, and a first gear 91 and a second gear 92 are provided on the input shaft 90. An intermediate shaft 93 is mounted on the gear case 89, a normal rotation gear 94 and a reverse rotation gear 95 are axially mounted on the intermediate shaft 93, and a switching clutch 96 is provided between the normal rotation gear 94 and the reverse rotation gear 95. The shifter (not shown) of the clutch 96 is connected to the emergency switch.
Therefore, the rotation direction of the output shaft 97 of the gear case 89 can be switched between forward and reverse by switching the clutch 96.
98A is an intermediate output pulley, and 98B is an input pulley.

(Operation of Example)
The engine 10 is started, the vehicle travels with the traveling device 2, and the cereals harvested by the reaping device 4 during traveling are threshed by the threshing device.
When the engine 10 is started, the rotation of the engine 10 is transmitted to the fan continuously variable transmission 30, and the fan continuously variable transmission 30 shifts continuously to rotate the cooling fan 20 in the normal direction, and the dust cover of the radiator cover 22 is protected. Outside air is sucked from the net 24, and the sucked outside air passes through the radiator 21 to cool the cooling water for cooling the engine 10 and blows out while cooling the outer periphery of the engine 10.
When the mowing and threshing operation is continued, deposits such as sawdust and dust adhere to the front side of the dust-proof net 24 of the radiator cover 22, so that the cooling fan 20 is rotated reversely by the fan continuously variable transmission 30, The air is blown away from the aircraft and then blown away.

The cooling fan 20 is driven to rotate forward and reverse by a fan continuously variable transmission (HST) 30 that continuously changes the drive rotation of the engine 10, and the fan continuously variable transmission 30 eliminates the traveling device 2. Since the driving rotation is input from the traveling pump input shaft 14 of the traveling continuously variable transmission 11 that shifts in stages, the fan continuously variable transmission is transmitted to the traveling continuously variable transmission 11. Rotation can be input to the fan hydraulic pump 31 of the transmission 30 to simplify the belt transmission configuration around the engine 10 and facilitate maintenance work.
The traveling pump input shaft 14 of the traveling continuously variable transmission 11 is provided with an input pulley 15 for rotational input from the engine 10 at one end protruding inward from the case 33, and the traveling pump input shaft 14 is provided outside the case 33. Since the end is extended and the rotation is output from the outer projecting portion of the traveling pump input shaft 14 toward the fan hydraulic pump 31 of the fan continuously variable transmission 30, the fan continuously variable transmission 30 is provided. Since this rotation transmission can be performed by one belt 37, the configuration is simplified and the maintenance work is facilitated also in this respect.

That is, the output rotation of the engine output shaft 16 of the engine 10 is transmitted to the traveling pump input shaft 14 via the inner output pulley 17, the belt 18 and the input pulley 15, and is transmitted to the hydraulic pump 12 of the traveling continuously variable transmission 11. It is inputted and shifted by the hydraulic pump 12 and the hydraulic motor 13 to drive the traveling device 2. On the other hand, the rotation of the traveling pump input shaft 14 is directly outputted to the intermediate output pulley 35, and the intermediate output pulley 35 and the belt 37 are input. The cooling fan 20 is input to the fan hydraulic pump 31 of the fan continuously variable transmission 30 via the pulley 36 and is shifted by the fan hydraulic pump 31 and the fan hydraulic motor 32 of the fan continuously variable transmission 30. Rotate.
Therefore, the fan continuously variable transmission 30 can be provided outside the blowing range of the cooling fan 20, and the presence of the fan continuously variable transmission 30 does not become a resistance to blowing of the cooling fan 20, and cooling efficiency is improved. Do not decrease.

In this case, the fan rotating shaft 40 of the cooling fan 20 is mounted so as to be rotatably fitted in a double shaft state to a pump input shaft 42 of a water pump 41 provided at a predetermined position in the engine 10. The cooling fan 20 can be rotated in reverse and variable speed by the fan continuously variable transmission 30 while the fan rotation shaft 40 is mounted on the engine 10.
Therefore, the axial center of the cooling fan 20 can be arranged at the upper, lower, left and right intermediate positions of the engine 10 where the cooling efficiency is good with respect to the engine 10, and both the reverse rotation of the cooling fan 20 and the cooling efficiency can be achieved. Is preferred.
Further, when the cooling fan 20 is rotating forward, if the rotation direction of the fan rotation shaft 40 coincides with the rotation direction of the pump input shaft 42, the bearing provided between the fan rotation shaft 40 and the pump input shaft 42 is replaced. Durability can be improved.
Further, the fan rotation shaft 40 and the pump input shaft 42 are arranged in the upper and lower sides and the left and right middle in the side view of the engine 10, and when the fan continuously variable transmission 30 is mounted at a predetermined position on the outer periphery of the engine 10, The installation outside the range and the combined use of the rotational input configuration of the water pump 41 can be easily configured.

Further, since the fan continuously variable transmission 30 is attached between the front side of the engine 10 and the transmission case 19, it can be removed from the air blowing range of the cooling fan 20 and the arrangement of the belt 37 from the transmission case 19 is rational. Therefore, maintenance of the fan continuously variable transmission 30 is also facilitated.
In this case, since the continuously variable transmission 30 for the fan is provided in the space below the step 63 of the control unit 6 so as to face the opening 70, the distance from the cooling fan 20 is close and the space can be used effectively. It is preferable.
The trunnion shaft 71 and the trunnion arm 72 for shifting the fan hydraulic pump 31 of the fan continuously variable transmission 30 are provided on the side opposite to the belt 45 to which the rotation of the fan hydraulic motor 32 is transmitted. And setting work and maintenance work can be done easily.

That is, standing on the right side of the machine body, the maintenance is performed by placing a hand in the space below the step 63 from the opening 70 (FIG. 7).
In another embodiment of the fan continuously variable transmission 30 in FIG. 6, the input shaft 60 of the fan hydraulic pump 31 of the fan continuously variable transmission 30 is connected to the traveling pump input shaft 14 of the traveling continuously variable transmission 11. Since the input shaft 60 and the traveling pump input shaft 14 of the traveling continuously variable transmission 11 are connected to each other by the coupling mechanism 61, the rotational transmission mechanism that transmits to the traveling continuously variable transmission 11 is disposed. Is used to input rotation to the fan hydraulic pump 31 of the fan continuously variable transmission 30 and the rotation of the traveling pump input shaft 14 of the traveling continuously variable transmission 11 is not connected to the fan. Since transmission is performed to the fan hydraulic pump 31 of the step transmission 30, the transmission configuration is simplified and maintenance work is facilitated.
Each of the above-described embodiments is illustrated and described separately or mixed for easy understanding, but the embodiments in each of these drawings can be combined in various ways, and some of the drawings may be partially illustrated. These expressions may not be used to limit the structure / action and the like, and of course there may be synergistic effects.

  DESCRIPTION OF SYMBOLS 1 ... Airframe frame, 2 ... Traveling device, 3 ... Threshing device, 4 ... Mowing device, 5 ... Glen tank, 6 ... Steering part, 10 ... Engine, 11 ... Continuously variable transmission for traveling, 12 ... Hydraulic pump, 13 ... Hydraulic motor, 14 ... travel pump input shaft, 15 ... input pulley, 16 ... engine output shaft, 18 ... belt, 17 ... inner output pulley, 19 ... transmission case, 20 ... cooling fan, 21 ... radiator, 23 ... opening , 24 ... dust-proof net, 30 ... continuously variable transmission for fan, 31 ... hydraulic pump for fan, 32 ... hydraulic motor for fan, 33 ... case, 35 ... intermediate output pulley, 36 ... input pulley, 37 ... belt, 40 ... fan rotation shaft, 41 ... water pump, 42 ... pump input shaft, 43 ... input pulley, 44 ... output pulley, 45 ... belt, 47 ... output shaft, 48 ... output teeth 49 ... intermediate shaft, 50 ... intermediate gear, 51 ... output shaft, 52 ... input pulley, 60 ... input shaft, 61 ... coupling mechanism, 63 ... step, 70 ... opening, 71 ... trunnion shaft, 72 ... trunnion arm , 80 ... main speed change lever, 82 ... fine speed mode switch, 83 ... speed setting dial, 85 ... cereal supply and transfer device, 87 ... supply and transfer chain, 88 ... reverse rotation mechanism, 89 ... gear case, 90 ... input shaft, 91 ... first One gear, 92 ... second gear, 93 ... intermediate shaft, 94 ... forward gear, 95 ... reverse gear, 96 ... clutch, 97 ... output shaft.

Claims (5)

  A continuously variable transmission (11) for driving to drive the traveling device (2) by continuously changing the drive rotation of the engine (10) is provided, and a cooling fan (20) is provided outside the engine (10). A radiator (21) and a dust-proof net (37), and the cooling fan (20) is driven forward and reversely by a fan continuously variable transmission (30). A working vehicle characterized in that the transmission (30) is configured to input the driving rotation of the engine (10) via the traveling pump input shaft (14) of the continuously variable transmission (11) for traveling. .   The working vehicle according to claim 1, wherein the driving rotation of the engine (10) is applied to an inner end of a traveling pump input shaft (14) protruding from the case (33) of the traveling continuously variable transmission (11) to the inside of the machine body. An input pulley (15) for input is provided, the outer end of the traveling pump input shaft (14) is extended from the case (33) to the outside of the machine body, and the outer end of the traveling pump input shaft (14) is used for the fan. Drive rotation is output toward the fan hydraulic pump (31) of the continuously variable transmission (30), and the outer end of the traveling pump input shaft (14) is directed toward the fan hydraulic pump (31). A coupling mechanism (61) that is connected to the input shaft (46) of the intermediate output pulley (35) that outputs the drive rotation or the fan hydraulic pump (31) of the continuously variable transmission (30) for the fan. Special Working vehicle to be.   The working vehicle according to claim 1 or 2, wherein the fan rotation shaft (40) of the cooling fan (20) is a water pump (41) that circulates cooling water provided in an outer portion of the engine (10). In the forward rotation state where the cooling fan (20) blows air from the outside to the inside of the dust-proof net (37) and the rotation direction of the fan rotation shaft (40) and the pump input A working vehicle having a configuration in which the rotation direction of the shaft (42) coincides.   The working vehicle according to claim 1, claim 2, or claim 3, wherein a steering part (6) is provided on the upper side of the engine (10), and the continuously variable transmission for a fan (30) includes the steering part (6). A working vehicle, which is disposed in a lower space of step (63).   The working vehicle according to claim 1, claim 2, or claim 3 or claim 4, wherein the output pulley (44) of the fan hydraulic motor (32) of the fan continuously variable transmission (30) and the fan rotating shaft (40). ) And the input pulley (43), and the fan in the fan continuously variable transmission (30) as viewed in the axial direction of the output shaft (47) of the fan hydraulic motor (32). A working vehicle characterized in that a trunnion shaft (71) for shifting the hydraulic pump for fan (31) is provided on a surface opposite to the rotating shaft (40).

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