JP3688193B2 - Agricultural tractor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an agricultural tractor provided with an air conditioner unit.
[0002]
[Prior art]
When the air conditioner unit is installed on the top side of the ceiling of the driving cabin, the height of the driving cabin increases due to the space required for the arrangement of the air conditioning unit and the cover that is attached to the driving cabin so as to cover the air conditioning unit. The height of becomes higher. For this reason, when the air conditioner unit is provided on the back side of the control panel, air conditioning can be performed while the height of the entire tractor is made as low as possible.
As described above, in an agricultural tractor provided with an air conditioner unit on the back side of a control panel, conventionally, as shown in, for example, Japanese Patent Application Laid-Open Nos. 11-314514 and 11-278040, an evaporator and a heater core The one that is located on the lower side in the air flow direction for air conditioning and that performs the final heat exchange process discharges the temperature-controlled air upward or downward in the vehicle body.
[0003]
In a farm tractor provided with an air conditioner unit, when temperature-controlled air from the air-conditioner unit is supplied from a plurality of outlets having different arrangement levels, conventionally, air-conditioning air is supplied from all outlets during heating. Was supposed to be blown out.
[0004]
[Problems to be solved by the invention]
In the case where the air conditioner unit is provided on the back side of the control panel, the temperature control air from the air conditioner unit is provided in order to supply the temperature-controlled air from the air conditioner unit into the cabin through the air outlets at different positions. However, in the case of a conventional air conditioner unit, a duct with a complicated structure is required because the direction of the temperature-controlled air from the final heat exchanger is upward or downward. It was.
[0005]
In the case where an air conditioner unit is provided on the back side of the control panel, if the upper outlet is located at a higher level than the top panel of the control panel, the temperature-controlled air will reach the highest level in the cabin, especially during cooling. Blows out and can be advantageously air-conditioned. In this case, since the upper outlet projects from the control panel, it may become an obstacle when looking forward from the cabin depending on the arrangement.
[0006]
In the case of an air conditioner equipped with an air conditioner, if the air is heated and the face is lit up and cooling is required, it is necessary to switch the operation of the entire air conditioner to cooling even if it is only necessary to cool it temporarily. It was. In addition, even when switching to cooling, it may be difficult to generate cold air immediately, or cold air may be emitted from all of the plurality of outlets, resulting in excessive cooling.
[0007]
An object of the present invention is to supply temperature-controlled air from an air-conditioning unit to a plurality of outlets through a duct having a relatively simple structure, to advantageously perform air-conditioning while making the outlets less likely to obstruct operation, It is an object of the present invention to provide an agricultural tractor that can quickly and easily perform temporary cold air extraction during operation.
[0008]
[Means for Solving the Problems]
The configuration, operation, and effect of the invention according to claim 1 are as follows.
[0009]
〔Constitution〕
In an agricultural tractor in which an air conditioner unit is provided in a space formed between a partition wall that divides the space in the engine bonnet and the driving cabin and the control panel in the driving cabin,
Forming a protruding portion that partially protrudes to the engine bonnet side in the partition;
Among the evaporator and heater core of the air conditioner unit, the exhaust air direction of the one located on the lower side in the air flow direction for air conditioning is set to the front of the vehicle body,
A front end portion for changing and guiding the flow direction of the exhaust air directed toward the front of the vehicle body from the one located on the lower side thereof is reversed to the rear direction of the vehicle body, and connected to the unit case of the air conditioner unit,
A ventilation duct that guides and guides air-conditioning air that flows toward the rear of the vehicle body through the front end portion thereof is provided in the control panel so as to be positioned laterally on the side of the unit case.
The heater core and the evaporator are positioned on the front side of the steering handle shaft at a position above the blower fan in the control panel, and the blower fan is displaced to one side of the steering handle shaft in the control panel. Let
The formed front end portion to said unit case, are arranged in a state of intruded the formed protruded portions on the partition wall, the air duct leading to the front Symbol forward end portion, and the blowing fan, the evaporator and the heater core of the air conditioning unit Among them, they are arranged so as to overlap in the longitudinal direction of the vehicle body with respect to those located on the upper side in the air flow direction for air conditioning.
[0010]
[Action]
Regardless of the evaporator and heater core located on the lower side of the air-conditioning air flow direction, if the exhaust direction is upward or downward, temperature-controlled air from the air conditioner unit is supplied to the multiple outlets with different arrangement levels by ducts In this case, a duct in which a part of the plurality of outlets reaching a part determined by the exhaust direction of the final heat exchanger has a complicated path compared to a part of the part leading to another outlet. By adopting, temperature-controlled air is supplied from the air conditioner unit to each outlet. On the other hand, among the evaporator and the heater core, the air exhaust direction of the air flow direction for air conditioning that is located on the lower side is the front direction of the vehicle body, so the structure of the path from the air outlet of the air conditioner unit to the outlet is Regulated air is supplied from the air conditioner unit to each outlet through a duct that does not differ greatly even if the outlet is different.
Since the air duct is aligned with the air conditioner unit in the lateral direction of the vehicle body, the air duct and the air conditioner unit can be installed on the back side of the operation panel while the operation panel is positioned as far as possible in the cabin.
[0011]
〔effect〕
Therefore, as a duct for supplying temperature-controlled air from the air conditioner unit to a plurality of outlets having different arrangement levels, a duct having a simple structure that does not have a large difference in the structure of the route leading to it even if the outlets are different, is adopted. The space required to install a duct on the back side of the control panel can be reduced, and the control panel is positioned as far as possible in the cabin so that the interior of the cabin can be used widely.
The space inside the cabin can be widely used for driving by placing the air duct on the back side of the control panel and positioning the control panel as far as possible in the cabin .
[0012]
[0013]
[0014]
[0015]
[0016]
The structure, operation, and effect of the invention according to claim 2 are as follows.
[0017]
〔Constitution〕
In the configuration of the invention according to claim 1 , the air outlet includes an upper air outlet, a central air outlet, and a foot air outlet having different arrangement levels as the air outlet, and the temperature control air from the air conditioner unit is supplied to the air duct. It supplies so that it may supply to a blower outlet, a center blower outlet, and a foot blower outlet.
[0018]
[Action]
Temperature-controlled air from the air conditioner unit is supplied to the upper outlet, the central outlet, and the foot outlet, and is blown into the cabin from each outlet.
[0019]
〔effect〕
Temperature-controlled air is blown into the cabin from each of the upper outlet, the central outlet, and the foot outlet, thereby efficiently air-conditioning the cabin.
[0020]
The structure, operation, and effect of the invention according to claim 3 are as follows.
[0021]
〔Constitution〕
A pair of left and right upper air outlets for supplying conditioned air from the air conditioner unit into the cabin at a higher arrangement level than the top panel of the control panel is provided, and a gap is provided between the left and right upper air outlets. .
[0022]
[Action]
A pair of left and right upper air outlets that supply temperature-controlled air from the air conditioner unit to the cabin at a higher level than the top panel of the control panel are provided, so the temperature-controlled air is supplied to the highest level in the cabin. Air conditioning is possible.
[0023]
Since there is a gap between the left and right upper outlets, it is possible to drive while looking forward from the gap.
[0024]
〔effect〕
Temperature control air is supplied to the highest level in the cabin by the upper outlet, and air conditioning can be performed efficiently especially during cooling. For that reason, it is easy to drive while looking forward from between the upper outlets.
[0025]
The configuration, operation, and effect of the invention according to claim 4 are as follows.
[0026]
〔Constitution〕
In the agricultural tractor, which supplies temperature-controlled air from the air conditioner unit into the cabin and has a plurality of outlets with different arrangement levels ,
The plurality of outlets include an upper outlet, a foot outlet, and a central outlet located at a higher level than the foot outlet and at a lower level than the upper outlet, the upper outlet and the foot outlet. Is configured to blow out temperature-controlled air for both cooling and heating, and the central outlet blows temperature-controlled air for cooling only .
[0027]
[Action]
When performing heating, the air outlet for cooling only is usually closed so that no cool air is emitted. Even when heating is performed, if the cooling outlet is opened, conditioned air for cooling is supplied from the outlet without switching the air conditioning operation to cooling.
In other words, the upper outlet and the foot outlet are designed to blow out the temperature-controlled air for both cooling and heating, and the central outlet is designed to blow out the temperature-controlled air for cooling only. Rather than taking in from the upper outlet and the foot outlet, it can be taken in from the central outlet and acted more effectively in the driver and cabin.
[0028]
〔effect〕
Even during heating, not only can the cool air be taken in simply and quickly by opening the air outlet for cooling only, but the cold air can be taken into the driver and the cabin effectively.
[0029]
[0030]
[0031]
[0032]
[0033]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, a driving unit that is self-propelled by a pair of left and right steering and driveable front wheels 1 and a pair of left and right driveable rear wheels 2 and that has an engine 3, an engine bonnet 4, and the like is on the front side. A pair of left and right lifts connected to a transmission case 6 that forms a rear portion of a vehicle body that is provided and has a driving part having a driving cabin 5 on the rear side so that various working devices such as a rotary tiller can be moved up and down. An agricultural tractor is configured by providing the arm 7 and a power take-out shaft 8 for transmitting the turning power from the engine 3 to the connected working device.
[0034]
As shown in FIGS. 3 and 6, an instrument panel 10 having a speedometer, a fuel gauge, and the like is provided at the upper end in front of a driver seat 9 in the driver's cabin, and is slightly below the instrument panel 10. The steering panel 12 through which the steering handle shaft 11a is inserted is provided. Set the lift lever 7 for raising and lowering the lift arm 7 and raising and lowering the connecting work device to the position deviated from the steering handle shaft 11a of the control panel 12 toward the vehicle body side, and adjusting the accelerator of the engine 3 to the adjustment position. A state in which the front wheel 1 is driven at a higher speed than the rear wheel 2 by switching the accelerator lever 15, the engine start key switch 16, and the front wheel transmission, and the front wheel 1 is driven at the same speed as the rear wheel 2. The front wheel speed change lever 17 that reveals the state of the vehicle and the parking brake lever 18 that applies the parking brake while fixing the brake pedal in the on position are arranged.
[0035]
The steering handle shaft 11 a is supported by a handle support 19 located inside the control panel 12. The handle support 19 is supported by a member fixed on the vehicle body side so as to be swingable around a lateral axis of the vehicle body, and the steering handle 11 is swing-adjusted with respect to the vehicle body together with the handle support body 19. It is supported by the handle support 19 so that it can. Thus, the steering handle 11 is a tilt handle so that the mounting angle of the steering handle 11 can be adjusted around the axis by adjusting the handle support 19 to swing.
[0036]
As shown in FIGS. 3 and 6, an air conditioner unit 20 having an evaporator 21 and a blower fan 22 is provided on the back side of the control panel 12, and a cylindrical body 30 is provided on both sides of the top plate portion 12 a of the control panel 12. And a circular upper outlet 31 provided so as to be positioned at a slightly higher level than the top surface of the top panel 12a of the control panel 12 and a rectangular provided on both sides of the lower end of the control panel 12. The foot outlet 33 is positioned at a higher level than the foot outlet 33 on both sides of the control panel 12 and at a lower level than the upper outlet 31, and the steering handle shaft 11 a. The temperature-controlled air from the air conditioner unit 20 is supplied from the air outlet units 31 to 33 to the rectangular central air outlet 32 provided with a through hole in a portion located on the side of the air conditioner. It is configured to be supplied within, Yes to allow the air conditioning to cool and heat the operation unit, specifically, are constructed as follows.
[0037]
As shown in FIG. 6 and the like, the pair of upper air outlets 31 are positioned so as to be displaced in the lateral direction of the vehicle body with respect to the wiper motor 13 located on the back side of the upper end portion of the control panel 12 and the instrument panel 10. In addition, they are distributed in the lateral direction of the vehicle body so that a gap is formed between the left and right upper outlets 31.
[0038]
As shown in FIGS. 3, 5, 10, and the like, the air conditioner unit 20 includes the evaporator 21, the heater core 23, the blower fan 22, and a hollow unit case 26 that supports these, An air intake guide 27 is connected to the unit case 26 on the side of the blower fan 22.
In the unit case 26, air blowing ports 25 are formed on both lateral sides of the heater core 23 by a portion 26 a located on the front end side of the air conditioner unit 20. The intake guide 27 forms a vehicle body upward-facing outside air suction port 28 having an inside / outside air switching valve mechanism 47 and a vehicle body laterally outward internal intake port 29 having an inside air filter 44.
[0039]
The air conditioner unit 20 includes a partition 34 provided so as to separate an engine bonnet space and a driving cabin space between a driving part and a driving part, and the control panel 12 includes a clutch housing 3a on the back side of the control panel 12. In the space formed above, it is assembled in the following assembling posture.
[0040]
That is, as shown in FIGS. 3 and 4, the rotational axis of the blower fan 22 is a lateral axis of the vehicle body, and the blower fan 22 is positioned at a lower level than the arrangement level of the evaporator 21 and the heater core 23. Further, the blower fan 22 is assembled so that the lower end of the blower fan 22 is located near the upper end of the clutch housing 3a. The evaporator 21 and the heater core 23 are assembled so that they are aligned in the longitudinal direction of the vehicle body, and the heater core 23 is positioned on the front side of the vehicle body with respect to the evaporator 21. The evaporator 21 and the heater core 23 are assembled so that the length in the longitudinal direction of the vehicle body in a side view of the vehicle body is in a vertically long position where the length is smaller than the length in the vertical direction of the vehicle body.
As shown in FIG. 5 and the like, the front end portion 26a of the unit case 26 provided with the pair of left and right air vents 25 is arranged such that the exhaust direction of the heater core 23 is directed forward of the vehicle body, and the driving portion of the partition wall 34 is provided. It is assembled so as to enter the inside of the portion 34a protruding to the side. In other words, the front end portion 26a serves as a guide portion that guides and reverses exhaust air directed toward the front of the vehicle body from the heater core 23 located on the lower side in the air flow direction for air conditioning so as to be directed toward the rear of the vehicle body . It has a function .
The blower fan 22 is positioned so as to be eccentric to one side of the vehicle body laterally with respect to the evaporator 21 and the heater core 23, and as shown in FIG. The key switch 16, the front wheel speed change lever 17, and the parking brake lever 18 are assembled so that they are located on the other end side of the vehicle body with respect to the steering handle shaft 11a. is there. A unit mounting portion 34c provided with a bolt hole in the protruding portion 34a of the partition wall 34, a unit mounting portion 34d provided with a bracket attached to the other portion of the partition wall 34, or a unit case on the other unit mounting portion. 26 is fixed by fastening with a connecting bolt.
[0041]
As shown in FIGS. 1, 2, 5, 10, 13, and the like, the vehicle body lateral axis around the vehicle bonnet 4 located on the rear end side of the engine bonnet with respect to the portion 4 a fixed to the vehicle body of the engine bonnet 4. The outer part located outside the space formed by the partition wall 34 and the control panel 12 by the part 4b that swings up and down and the sheet metal member 35 attached to the outer surface side of the opening and closing bonnet part 4b. A duct 36 is formed. One end side is connected to the external duct 36 and the protruding portion 34a of the partition wall 34, and the other end side is inserted through a through hole 34b provided on one end side in the vehicle body lateral direction of the partition wall 34 so that the control panel in the cabin is provided. The air intake unit 39 is configured to allow the air conditioner unit 20 to take in the outside air of the operating cabin 5 as air conditioning air.
[0042]
That is, as shown in FIG. 13, a plurality of through-holes elongated in the front-rear direction of the vehicle body are formed in the sheet metal member 35 at the ends of the external duct 36 located on both lateral outer sides of the opening / closing bonnet portion 4 b of the engine bonnet 4. An external air inlet 40 is formed, and an external air supply hole 41 is formed in the middle portion of the external duct 36 in the left-right direction of the vehicle body.
[0043]
The internal duct 37 is provided with an external air intake 43 that communicates with the external air supply hole 41 of the external duct 36 via an external air filter 42 on one end side, and an opening on the other end faces the through hole 34 b of the partition wall 34. One end side communicates with the portion 37a located in the engine bonnet in the state and the inside portion 37a of the partition wall 34 near the through hole 34b, and the other end communicates with the outside air suction port 28 of the air conditioner unit 20. It is comprised by the part 37b located in a cabin in the state. As shown in FIGS. 11 and 12, the air in the operating cabin is sucked into the air conditioner unit 20 by the suction force of the blower fan 22 in the portion 12 b of the control panel 12 facing the internal intake port 29 of the air conditioner unit 20. An air vent 46 with a dust removing net is provided.
[0044]
The bonnet inner portion 37a of the internal duct 37 is formed by the protruding portion 34a of the partition wall 34 and a sheet metal member attached to the wall surface of the protruding portion 34a facing the engine bonnet. It is located outside the space formed by the control panel 12. The outside air filter 42 remains inside the internal duct 37 even when the opening / closing bonnet portion 4b is lifted and opened, and is located outside the space formed by the partition wall 34 and the control panel 12. It is fixed to the outside air intake 43 of the duct 37.
[0045]
The inside / outside air switching valve mechanism 47 can be switched between the inside air side and the outside air side by the swinging operation of the operation portion 47a. When the inside / outside air switching valve mechanism 47 is switched to the outside air side, the outside air suction port 28 is switched to the open side and the inside duct 37 is guided to the intake air. 27, the blower fan 22 can suck the cabin outside air from the external intake port 40 of the intake duct 39. When switched to the inside air side, the outside air suction port 28 is switched to the closed side, so that the blower fan 22 can suck the cabin inside air from the internal intake port 29.
[0046]
2 and 9, the air conditioner unit 20 is connected to the front end portion 26a of the unit case 26 and the pair of left and right air outlets 25 of the front end portion 26a, respectively, and the air conditioner unit. 20 and a pair of air duct bodies 48 provided inside the control panel 12 so as to be arranged on both sides of the air conditioner unit 20 so as to be arranged in the horizontal direction of the vehicle body, and a guide attached to the inner surface side of the control panel portion 12b. The cylinder 12c constitutes an air duct 49 that supplies temperature-controlled air from the air conditioner unit 20 to the six outlets 31 to 33.
[0047]
As shown in FIG. 11, the left and right blast duct bodies 48 and 48 face the introduction cylinder 48a at the middle in the vertical direction and the direction opposite to the opening of the introduction cylinder 48a. The upper and lower ends are provided with air outlets 48c, 48d, 33, which are connected to the air outlet 25 of the unit case front end portion 26a by the introduction cylinder part 48a. Temperature-controlled air from the heater core 23 of the air conditioner unit 20 is introduced into the interior and distributed to the upper and lower three air outlets 48b, 48c, 48d, 33, and supplied to the upper outlet 31 from the upper air outlet 48a. The air is blown into the cabin from the upper blow-out port 31, supplied to the central blow-out port 32 from the blower port 48 b in the intermediate portion, and blown out from the central blow-out port 32 into the cabin. A lower end opening 48d of one air duct body 48 communicates with the guide cylinder 12c of the control panel portion 12b, and supplies the temperature-controlled air from the air conditioner unit 20 to the foot outlet 33 via the guide cylinder 12c. The air is blown out from the foot outlet 33 into the cabin. The lower end opening 33 of the other air duct body 48 forms the other foot outlet 33 and blows the temperature-controlled air from the air conditioner unit 20 into the cabin from the foot outlet 33.
[0048]
Wind direction control tools 31a are provided at the left and right upper air outlets 31, respectively. This air direction control tool 31a can be adjusted in a three-dimensional direction along a spherical support surface provided by attaching a support to the air duct body 48, and by adjusting the rotation, The blowing direction of the temperature-controlled air blown into the cabin from the mouth 31 can be adjusted to an arbitrary direction such as leftward, rightward, upward, downward, or diagonally.
[0049]
As shown in FIGS. 3, 4, 7, etc., a metal pipe that extends from the evaporator 21 and has an extended end projecting into the engine bonnet from a through hole provided on one end of the partition wall 34 in the left-right direction of the vehicle body. Thus, an inlet 21a and an outlet 21b for the cooling medium of the evaporator 21 are formed, and the extension end side protrudes into the engine bonnet from a through hole provided on the other end side of the partition wall 34 in the left-right direction of the vehicle body. An inlet 23a and an outlet 23b for the heating medium of the heater core 23 are formed by the metal pipe. Thereby, the inlet 21a and the outlet 21b of the cooling medium of the air conditioner unit 20 protrude from the partition wall 34 to the driving portion side, and are positioned on one side of the engine 3 in the longitudinal direction of the vehicle body. The medium inlet 23a and the outlet 23b protrude from the partition wall 34 toward the driving portion and are located on the other side of the engine 3 in the longitudinal direction of the vehicle body.
[0050]
As shown in FIG. 7, a cooling medium supply hose in which the cooling medium inlet 21 a is routed through the side opposite to the side where the muffler 50 of the engine 3 is located and a receiver 51 is provided in the middle. 52 is connected to the heat medium delivery side of the condenser 54 provided on the front side of the engine cooling radiator 53, and the cooling medium outlet 21 b is driven by the engine 3 near the front end of the engine 3 by the cooling medium reduction hose 55. It was connected to the heat medium intake side of the compressor 56 configured and provided, and the heat medium discharge side of the compressor 56 was piped so as to pass through the side opposite to the side where the muffler muffler 50 of the engine 3 is located. The cooling medium supply hose 57 is connected to the heat medium receiving side of the capacitor 54. As a result, the cooling medium circulates between the condenser 54 and the evaporator 21, exchanges heat with the cooling air using the condenser 54, and then exchanges heat with the air-conditioning air using the evaporator 21.
[0051]
The heating medium inlet 23a is piped so as to pass the side of the engine 3 where the muffler 50 is located, and a heating medium supply hose 59 provided with a temperature control valve 58 in the middle of the engine cooling radiator 53 is provided. Connected to the upper tank, the heating medium outlet 23b is connected to the lower tank of the engine cooling radiator 53 by a heating medium reducing hose 60 piped so as to pass the side of the engine 3 where the muffler 50 is located. Connected. Thereby, engine cooling water as a heating medium heated by cooling the engine 3 is supplied to the heater core 23 to exchange heat with air for air conditioning, and then returns to the radiator 53.
[0052]
As shown in FIGS. 2 and 6, an air conditioner switch 63, a temperature adjuster 64, and an inside / outside air switch are provided at a position below the steering handle shaft 11 a passing through the handle shaft hole of the control panel 12. An air conditioner operation panel 66 provided with a tool 65 is attached. The air conditioner switch 63 is a rotary operation type that is switched by rotating a knob. When the switching operation is performed, the electric motor M that drives the blower fan 22 is operated to turn the blower fan 22 on and off, Change the rotation speed and adjust the air flow. The temperature adjustment tool 64 is a slide type that is slid along the guide groove of the operation panel 66. When the temperature adjustment tool 64 is slid, the operation portion of the temperature control valve 58 is switched through an operation cable. The inside / outside air switching tool 65 is a sliding type that slides along the guide groove of the operation panel 66. When the sliding operation is performed, the operation portion 47a of the inside / outside air switching valve mechanism 47 is switched via the operation cable and the link mechanism. Manipulate.
[0053]
That is, when the air conditioner switch 63 is switched to the on side, the blower fan 22 is driven, and the air conditioner unit 20 is moved from the external intake port 40 to the intake guide 27 via the intake duct 39 by the suction and discharge action of the blower fan 22 or Air conditioning air is introduced into the intake guide 27 from the internal intake port 29 and introduced into the unit case 26 from the intake guide 27, and is supplied to the evaporator 21 and the heater core 23 in the unit case 26 for cooling. Heat treatment. That is, the evaporator 21 is passed from the rear side to the front side, and then the heater core 23 is supplied so as to pass from the rear side to the front side. The evaporator 21 is cooled, and the heater core 23 is heated. The temperature-controlled air after cooling and warming treatment is discharged from the heater core 23 toward the front of the vehicle body and sent to the center portion of the front end portion 26a of the unit case 26 in the left-right direction. Then, the right and left duct bodies 48 of the air duct 49 supply the temperature-controlled air from the air conditioner unit 20 to the upper air outlet 31, the central air outlet 32, and the foot air outlet 33, respectively, and drive cabins from the air outlets 31 to 33, respectively. Blow in.
[0054]
When the temperature adjuster 64 is operated, the temperature control valve 58 is activated to adjust the amount of hot water supplied to the heater core 23. Then, the heating process by the heater core 23 changes, and the temperature of the temperature-controlled air that blows out from the air blowing ports 31 to 33 changes. That is, the temperature of heating and cooling can be adjusted.
[0055]
When the inside / outside air switching tool 65 is operated to the outside air side, the inside / outside air switching valve mechanism 47 is switched to the outside air side. Then, the air conditioner unit 20 sucks the cabin outside air as air conditioning air and performs air conditioning while sending the outside air into the cabin. When the inside / outside air switching tool 65 is operated to the inside air side, the inside / outside air switching valve mechanism 47 is switched to the inside air side.
Then, the air conditioner unit 20 sucks the cabin inside air as air conditioning air and performs air conditioning while circulating the cabin inside air.
[0056]
As shown in FIGS. 6 and 11, the panel portion 12b of the control panel 12 that faces the internal air intake port 29 of the air conditioner unit 20 is formed as a separate part from the other control panel portions. The other panel portion is detachably connected by a mounting screw 12d. As a result, when the panel portion 12b is removed, the inside air filter 44 is exposed in the cabin and can be easily cleaned and replaced.
[0057]
As shown in FIG. 2 and the like, a heat insulating plate 70 is provided near the front side of the partition wall 34 in the engine bonnet while being supported by the rear end portion of the engine 3. The heat insulating plate 70 covers the bonnet inner portion 37a of the internal duct 37 and the partition wall 34 in a state where a gap 71 exists between them, and the air conditioning unit 20 sucks the air conditioning air sucked from the external air inlet 40 into the engine. Makes it difficult to transfer heat such as engine heat dissipation in the hood.
[0058]
The gap 71 between the heat insulating plate 70 and the bonnet inner portion 37 a of the internal duct 37 communicates with the inside of the external duct 36 around the outside air filter 42 via the outside air supply hole 41 of the outside duct 36. Thereby, the outside air that has flowed into the external duct 36 from the external air inlet 40 enters the gap 71 and cools the heat insulating plate 70, thereby improving the temperature rise prevention effect of the internal duct 37 and the partition wall 34 by the heat insulating plate 70.
[0059]
[Another Embodiment] FIG. 14 shows a part of an agricultural tractor having an air conditioner unit according to another embodiment. In this tractor, the air conditioner unit 20 is mounted on the back side of the control panel 12 in the assembled posture shown in FIG. Is assembled. That is, the portion of the unit case 26 that includes the blower fan 22 and the pair of left and right intake ports 24 is located inside the portion 34 a that protrudes toward the driving portion of the partition wall 34, and the evaporator 21. The heater core 23 is located on the vehicle body rear side of the blower fan 22, and the heater core 23 is assembled in an assembling posture located above the evaporator 21.
[0060]
An internal duct 75 attached to the wall surface of the partition wall 34 on the driving portion side of the protruding portion 34a and communicating with the inside of the protruding portion 34a through a through hole of the protruding portion 34a, and an external duct shown in FIG. An air intake duct 76 that allows the air conditioner unit 20 to take in the outside air of the operating cabin 5 as air conditioning air is configured by an external duct 36 similar to 36.
[0061]
An inside / outside air switching valve mechanism 47 is provided inside a portion of the internal duct 75 located between the outside air filter 42 and the air conditioner unit 20.
[0062]
As shown in FIGS. 14 and 15, the air conditioner unit 20 includes a rear air outlet 77 provided on both lateral sides of the rear end portion of the unit case 26, and upper portions provided on both lateral sides of the upper end portion of the unit case 26. Temperature-controlled air is sent out from the air blowing port 78. The temperature-controlled air from the left and right rear blowing ports 77 is directly supplied from the rear blowing ports 77 to the central outlet 32 b of the control panel 12. The temperature-controlled air blown out from the left and right upper air blowing ports 78 is distributed to the upper end side and the lower end side thereof by the air blowing duct 79 connected to the upper air blowing port 78, and from the opening at the upper end portion. The air is supplied to the upper outlet 31b of the control panel 12 and blown into the cabin, and the opening at the lower end portion forms a foot outlet 33b, from which temperature-controlled air is blown into the cabin.
[0063]
This air conditioner unit 20 has passed through only the evaporator 21 of the evaporator 21 and the heater core 23 from the left and right rear fan ports 77 due to the arrangement setting of the air blowing ports 77 and 78, the evaporator 21, the heater core 23, and the air blowing fan 22. Temperature-controlled air is blown out, and temperature-controlled air that has passed through both the evaporator 21 and the heater core 23 is blown out from the left and right upper air blowing ports 78.
[0064]
As a result, of the upper outlet 31b, the central outlet 32b, and the foot outlet 33b, the central outlet 32b that is located at a higher level than the foot outlet 33b and lower than the upper outlet 31b is only for cooling. The temperature-controlled air is blown out, and the upper air outlet 31b and the foot outlet 33b blow out both air-conditioned air.
[0065]
Wind direction control tools 80 are provided at the left and right central outlets 32b. This wind direction control tool 80 opens the central outlet 32 so that the temperature-controlled air for cooling is emitted, closes it so that the temperature-controlled air for cooling does not come out, or adjusts the direction of the temperature-controlled air that blows out. It is.
[Brief description of the drawings]
[Fig. 1] Side view of the entire agricultural tractor [Fig. 2] Left side view of the air conditioner unit arrangement [Fig. 3] Left side view of the air conditioner unit arrangement [Fig. 4] Right side view of the air conditioner unit arrangement [ [Fig. 5] Plan view of the air conditioner unit installation section [Fig. 6] Front view of the control panel [Fig. 7] Air conditioner piping diagram [Fig. 8] Rear view of the air conditioner unit [Fig. 9] Front view of the air duct [Fig. FIG. 11 is a perspective view of an air duct unit body and a control panel portion. FIG. 12 is a front view of an arrangement part of a foot outlet. FIG. 13 is an illustration of an arrangement part of an air conditioner unit according to another embodiment. FIG. 14 is a front view of an air duct of an air conditioner unit including another embodiment. FIG. 15 is a front view of an air duct of an air conditioner unit including another embodiment.
12 Control panel 20 Air-conditioner unit 21 Evaporator 23 Heater cores 31, 31b Upper outlet 32, 32b Central outlet 33, 33b Foot outlet 48 Air duct

Claims (4)

An agricultural tractor in which an air conditioner unit is provided in a space formed between a partition wall that divides the space in the engine bonnet and the driving cabin and the control panel in the driving cabin,
Forming a protruding portion that partially protrudes toward the engine bonnet on the partition wall;
Among the evaporator and heater core of the air conditioner unit, the exhaust air direction of the one located on the lower side in the air flow direction for air conditioning is set to the front of the vehicle body,
A front end portion for changing and guiding the flow direction of the exhaust air directed toward the front of the vehicle body from the one located on the lower side thereof is reversed to the rear direction of the vehicle body, and connected to the unit case of the air conditioner unit,
A ventilation duct that guides and guides air-conditioning air that flows toward the rear of the vehicle body through the front end portion thereof is provided in the control panel so as to be positioned laterally on the side of the unit case.
The heater core and the evaporator are positioned on the front side of the steering handle shaft at a location above the blower fan in the control panel, and the blower fan is displaced to the lateral side of the steering handle shaft in the control panel. Let
The formed front end portion to said unit case, are arranged in a state of intruded the formed protruded portions on the partition wall, the air duct leading to the front Symbol forward end portion, and the blowing fan, the evaporator and the heater core of the air conditioning unit Among these, the agricultural tractor arranged in a state of overlapping in the longitudinal direction of the vehicle body with respect to the one located on the upper side in the air flow direction for air conditioning. The air outlet includes an upper air outlet, a central air outlet, and a foot air outlet, which are arranged at different levels, and the air duct is provided with temperature-controlled air from the air conditioner unit, the upper air outlet, the central air outlet, and the foot air outlet. The agricultural tractor according to claim 1 , wherein the agricultural tractor is configured to be supplied to the farm. A pair of left and right upper air outlets for supplying conditioned air from the air conditioner unit into the cabin at a higher arrangement level than the top panel of the control panel is provided, and a gap is provided between the left and right upper air outlets. The agricultural tractor according to claim 1 or 2 . Agricultural tractor having a plurality of outlets with different arrangement levels while supplying conditioned air from an air conditioner unit into the cabin ,
The plurality of outlets include an upper outlet, a foot outlet, and a central outlet located at a higher level than the foot outlet and at a lower level than the upper outlet, the upper outlet and the foot outlet. Agricultural tractor that is configured so that air conditioning air for both air conditioning and heating is blown out, and the central outlet blows air that is air conditioning only .

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