JP2002096623A - Agricultural tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural tractor enable to install an air conditioner unit behind an operation panel while the operation panel is placed in front side as near as possible inside a cabin. SOLUTION: The air conditioner unit 20 is installed behind the operation panel 12. An evaporator 21 and an heater core 23 of the air conditioner unit 12 are attached in a position of which a length of back and forth direction of a vehicle is shorter than that of up and down direction in it's sight of the side of the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural tractor provided with an air conditioner unit behind a control panel.

[0002]

2. Description of the Related Art When an air conditioner unit is provided on the upper surface side of the ceiling of an operation cabin, the height of the operation cabin is reduced by a space required for disposing the air conditioner unit and a cover attached to the operation cabin so as to cover the air conditioner unit. Tractor, and the overall height of the tractor increases. For this reason,
In the agricultural tractor, an air conditioner unit is provided on the back side of the control panel so that air conditioning can be performed while the height of the entire tractor is reduced as much as possible.

[0003]

In this type of agricultural tractor, a conventional tractor is disclosed in, for example, Japanese Patent Application Laid-Open No. H11-314514.
As shown in the publication, the evaporator and the heater core of the air conditioner unit are mounted in a mounting posture in which the length in the front-rear direction of the vehicle body when viewed from the side of the vehicle body is larger than the length in the vertical direction of the vehicle body. For this reason, the space in the vehicle front-rear direction necessary for the installation of the air conditioner unit behind the control panel becomes large, and the space in the cabin occupied by the control panel becomes large. Further, dew water from an evaporator or the like falls over a wide area below the evaporator or the like, which may make it difficult to treat the dew water.

[0004] It is an object of the present invention to provide an agricultural tractor in which an air conditioner unit can be provided while minimizing the space in the cabin occupied by a control panel and facilitating the treatment of dew water from a heat exchanger.

[0005]

The constitution, operation and effect of the invention according to claim 1 are as follows.

[Constitution] In an agricultural tractor provided with an air conditioner unit on the back side of a control panel, the evaporator and the heater core of the air conditioner unit are arranged such that their length in the vehicle longitudinal direction when viewed from the side of the vehicle body is equal to the vertical direction of the vehicle body. The mounting posture is smaller than the length.

[Effect] Since the evaporator and the heater core are in the above-mentioned mounting posture, the space in the vehicle front-rear direction required for installing the evaporator and the heater core can be made smaller than that in the conventional case, and the air conditioner unit is installed accordingly. The air conditioner unit is provided behind the control panel while reducing the space in the front-rear direction of the vehicle body that needs to be secured behind the control panel and reducing the area where dew condensation water falls from an evaporator or the like.

[Effect] Therefore, the space in the vehicle front-rear direction which needs to be secured to provide the air conditioner unit on the back side of the control panel can be reduced so that the control panel is located as far forward in the cabin as possible. Can be widely used for driving. In addition, the area where the condensed water falls from the evaporator or the like is reduced, and the condensed water can be treated advantageously, for example, it can be discharged only by providing a relatively small tray.

The structure, operation and effect of the invention according to claim 2 are as follows.

[Structure] In the structure according to the first aspect of the present invention, the evaporator and the heater core of the air conditioner unit are arranged in a state of being arranged in the longitudinal direction of the vehicle body.

[Effect] When air for air-conditioning escapes from one of the evaporator and the heater core, the evaporator and the heater core are arranged so that there is the other on the lower side in the exit direction and the heat exchanger flows into the heat exchanger. The air-conditioning air can be supplied to both the evaporator and the heater core without providing a duct for guiding the air-conditioning air that has passed through one of them to flow into the other.

[Effect] Since it is not necessary to provide the duct, the length of the air conditioner unit in the longitudinal direction of the vehicle body is reduced by that much, so that the control panel is located as far forward as possible in the cabin, and the space in the cabin is widened for driving. Can be used.

The structure, operation and effect of the invention according to claim 3 are as follows.

[Structure] In the structure according to the second or third aspect of the invention, the evaporator and the heater core of the air conditioner unit are arranged so that the heater core is located on the vehicle body front side with respect to the evaporator.

[Operation] When the evaporator is located on the front side of the vehicle body with respect to the heater core, the height of the evaporator in the vehicle body vertical direction when viewed from the side of the vehicle body is larger than the height of the heater core in the vehicle body vertical direction. The height of the front end side in the vehicle body vertical direction is also increased. Then, a portion protruding between the engine and the engine bonnet in the driving portion is provided in a partition wall between the driving portion and the operating portion, and a part of the front end side of the air conditioner unit is inserted into the protruding portion. Even if an air conditioner unit is installed, a problem that the air conditioner does not enter, or even if it enters, does not enter sufficiently easily occurs. However, since the heater core is located on the front side of the vehicle body from the evaporator, the height of the front end side of the unit case in the vehicle body vertical direction is relatively small, and it is easy for the front end side of the unit case to easily enter the partition wall protruding portion. The air-conditioning unit is provided on the back side of the control panel such that the air-conditioning unit is as close as possible to the prime mover side due to the air-intake length.

[Effect] The air-conditioning unit is moved as close as possible to the prime mover so that the control panel is positioned as far forward as possible in the cabin, so that the operating space in the cabin can be made as large as possible.

The structure, operation and effect of the invention according to claim 4 are as follows.

[0018] [Structure] In the structure of the invention according to any one of claims 1 to 3, the evaporator, heater core and blower fan of the air conditioner unit are displaced in the vehicle longitudinal direction with respect to the evaporator and heater core. It is arranged in a state to do.

[Operation] Since the blower fan is displaced in the longitudinal direction of the vehicle body with respect to the evaporator and the heater core, the path for supplying air-conditioning air from the blower fan to the evaporator and the heater core is a simple path with less bending. The air can be sent from the blower fan to the evaporator and the heater core.

[Effect] The air-conditioning unit is made compact by simplifying the path for blowing air from the blower fan to the evaporator and the heater core, and the space reserved for installing the air-conditioning unit behind the control panel is reduced to a small space inside the cabin. Can be widely used for driving.

The configuration, operation and effect of the invention according to claim 5 are as follows.

[Configuration] In the configuration of the invention according to any one of claims 1 to 4, the evaporator, the heater core and the blower fan of the air conditioner unit are arranged on one side of the vehicle body with respect to the evaporator and the heater core. It is arranged in a state of being eccentric to one side.

[Operation] Since the blower fan is arranged so as to be eccentric to one side of the vehicle body with respect to the evaporator and the heater core, even if the evaporator and the heater core are positioned at the center in the vehicle body horizontal direction, the blower fan is blown. The air-conditioning unit is positioned on the control panel so that the fan is located on one side of the vehicle body, the blower fan and the steering handle shaft are arranged side by side in the vehicle body, and the control panel is positioned as far forward as possible in the cabin. It is provided on the back side.

[Effect] For example, the inside of the cabin can be widely used for driving, for example, by arranging the blower fan in the lateral direction of the vehicle body with the steering handle and positioning the control panel as forward as possible in the cabin.

The construction, operation and effect of the invention according to claim 6 are as follows.

[Configuration] In the configuration of the invention according to any one of claims 1 to 5, the evaporator, the heater core, and the blower fan of the air conditioner unit are set at a lower level than the arrangement level of the evaporator and the heater core. It is arranged in a state where it is located.

[Operation] Since the blower fan is located at a lower level than the arrangement level of the evaporator and the heater core, the blower fan can be arranged at a portion located at a lower level in the control panel. Since there is often a dead space in the lower part of the control panel,
Even if there is no special space for installing the blower fan behind the control panel, or even if it is specially secured, just keep a small space for the size of the blower fan, and the control panel The air conditioner unit is installed on the back side of the control panel while being positioned as far forward as possible.

[Effect] The control panel is located on the front side as much as possible in the cabin, so that it can be widely used for driving in the cabin.

The structure, operation and effect of the invention according to claim 7 are as follows.

[Configuration] In the configuration according to the sixth aspect of the present invention, the blower fan of the air conditioner unit is disposed near an upper portion of the clutch housing.

[Operation] Since the blower fan is disposed near the upper side of the clutch housing, the blower fan is located in a dead space at a low level portion in the control panel, and the control panel is positioned as far forward as possible in the cabin. The air conditioner unit is installed on the back side of the operation panel while the air conditioner is in a state of being operated.

[Effect] The steering panel is brought as close as possible to the front side in the cabin, and the cabin can be widely used for driving.

The structure, operation and effect of the invention according to claim 8 are as follows.

[Configuration] In the configuration of the invention according to any one of claims 1 to 7, the blower fan of the air conditioner unit is disposed so as to be displaced to one side of the vehicle body with respect to a steering handle shaft, The traveling operation tool is disposed so as to be displaced from the steering handle shaft to the other lateral side of the vehicle body.

[Operation] A mechanism for linking or linking the operating tool and the device operated by the operating tool is located on the back side of the control panel. For this reason, when the blower fan is located on the same side as the side on which the operating tool is located with respect to the steering handle shaft, a large space for arranging the interlocking mechanism or the linking mechanism and the blower fan so as not to interfere with each other is controlled. Must be secured behind the panel. On the other hand, since the blower fan is located on the side opposite to the side where the operating tool is located with respect to the steering handle shaft,
The control panel is provided on the rear side of the control panel while keeping the control panel as close to the front side of the cabin as possible without interfering with the interlocking mechanism or the linking mechanism and the blower fan.

[Effect] The control panel is brought as close as possible to the front side in the cabin, and the cabin can be widely used for driving.

The structure, operation and effect of the invention according to claim 9 are as follows.

[Configuration] In the configuration of the invention according to any one of claims 1 to 8, an outlet for supplying temperature-controlled air from the air conditioner unit into the cabin is provided on the vehicle body with respect to the wiper motor and the instrument panel. They are arranged so as to be displaced laterally.

[Operation] A duct for supplying the conditioned air from the air conditioner unit to the outlet is provided on the back side of the control panel. For this reason, when the outlet is located at the same position in the lateral direction of the vehicle body with respect to the wiper motor and the instrument panel, a large space for arranging the duct and the wiper motor and the instrument panel is provided so that they do not interfere with each other. Must be secured behind On the other hand, since the outlet is located in the lateral direction of the vehicle body with respect to the wiper motor and the instrument panel, the control panel is moved as close as possible to the front side in the cabin, and the duct is connected to the wiper motor and the instrument panel. Is provided on the back side of the control panel while preventing interference.

[Effect] The control panel is brought as close as possible to the front side in the cabin, and the cabin can be widely used for driving.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a pair of left and right steerable and driveable front wheels 1 and a pair of left and right drivable rear wheels 2 are self-propelled, and an engine 3, an engine bonnet 4, etc. A driving unit having a driving cabin 5 is provided on the front side and a driving unit having a driving cabin 5 is provided on the rear side. And a pair of left and right lift arms 7 connected to the vehicle and a power take-out shaft 8 for transmitting the turning power from the engine 3 to the connected working device, to constitute an agricultural tractor.

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 the driver's seat 9 in the driver's cabin. A steering panel 12 is provided slightly below the steering handle shaft 11a. A lift lever 14 for raising and lowering the lift arm 7 to raise and lower the connecting work device, and an accelerator for the engine 3 are set at an adjustment position by adjusting the accelerator of the engine 3 to a portion of the control panel 12 which is deviated from the steering handle shaft 11a to one side of the vehicle body. The front wheel 1 is driven at a higher speed than the rear wheel 2 by switching the accelerator lever 15, the key switch 16 for starting the engine, and the front wheel transmission, and the front wheel 1 is driven at the same speed as the rear wheel 2. And a parking brake lever 18 for applying a parking brake with the brake pedal fixed at the ON position.

The steering handle shaft 11a is supported by a handle support 19 located inside the control panel 12. The steering wheel support 19 is supported by a member fixed to the vehicle body so as to be freely swingable around a lateral axis of the vehicle body.
Is supported by the handle support 19 so as to be able to swing and adjust with respect to the vehicle body together with the handle support 19.
Thus, the steering handle 11 is a tilt handle such that the mounting angle of the steering handle 11 can be adjusted around the axis by swinging the handle support 19.

As shown in FIGS. 3 and 6, an evaporator 21 and a blowing fan 22
In addition to the air conditioner unit 20 having the control panel 12, the cylindrical bodies 30 are erected on both sides of the top panel 12a of the control panel 12 so as to be located at a slightly higher level than the upper surface of the top panel 12a of the control panel 12. Circular upper outlet 3
1, a rectangular foot outlet 33 provided on both lateral sides of the lower end of the control panel 12, and a higher arrangement level than the foot outlet 33 on both lateral sides of the control panel 12, and
Located at a lower placement level than the upper outlet 31;
Furthermore, a rectangular central outlet 32 provided with a through hole in a portion located on the side of the steering handle shaft 11a.
The air conditioner unit 2
It is configured so that the temperature-controlled air from 0 is supplied into the operation cabin to enable air-conditioning for cooling and heating the operation unit. More specifically, the configuration is as follows.

As shown in FIG. 6 and the like, the pair of upper outlets 31 are displaced in the lateral direction of the vehicle body with respect to the wiper motor 13 located behind the upper end of the control panel 12 and the instrument panel 10. The upper and lower upper outlets 31 are dispersed in the lateral direction of the vehicle body so that a gap is formed between the left and right upper outlets 31.

As shown in FIG. 3, FIG. 5, FIG. 10, etc., the air conditioner unit 20 comprises an evaporator 21, a heater core 23, a blower fan 22, and a hollow unit case for supporting these inside. 26 and an intake guide 27 connected to the unit case 26 on the side of the blower fan 22. The unit case 26 forms the air vents 25 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 includes an outside air suction port 28 having an inside / outside air switching valve mechanism 47 facing upwardly of the vehicle body, and an inside air intake port 29 having a inside air filter 44 and facing the vehicle laterally and outwardly.
And form.

The air-conditioning unit 20 includes a partition wall 34 provided between the prime mover and the driving section so as to isolate the space inside the engine hood and the space inside the driving cabin, and the control panel 12 is provided on the rear side of the control panel 12. It is mounted in the space formed above the clutch housing 3a in the following mounting posture.

That is, as shown in FIGS.
The rotation axis of the blower fan 22 becomes the axis of the vehicle body sideways,
Further, the blower fan 22 is disposed so as to be positioned at a lower level than the arrangement level of the evaporator 21 and the heater core 23, and further, the lower end of the blower fan 22 is positioned near the upper end of the clutch housing 3a. . The evaporator 21 and the heater core 23 are assembled so that they are arranged in the vehicle front-rear direction, and the heater core 23 is located 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 vehicle longitudinal direction when viewed from the side of the vehicle is shorter than the length in the vehicle vertical direction. As shown in FIG. 5 and the like, the exhaust air direction of the heater core 23 is set so as to face the front of the vehicle body.
Further, the pair of left and right air outlets 25 of the unit case 26
The front end portion 26a provided with the above is assembled so as to enter the inside of the portion 34a protruding toward the driving portion side of the partition wall 34. The blower fan 22 is positioned eccentrically to one side of the vehicle body with respect to the evaporator 21 and the heater core 23, and as shown in FIG. The key switch 16, the front wheel shift lever 17, and the parking brake lever 18 are positioned so as to be shifted from one end to the other side of the vehicle body with respect to the steering handle shaft 11a. is there. And
The unit case 26 may be mounted on a unit mounting portion 34c provided by opening a bolt hole in the protruding portion 34a of the partition 34, a unit mounting portion 34d provided by attaching a bracket to another portion of the partition 34, or other unit mounting portions. It is fixed by fastening with connecting bolts.

As shown in FIG. 1, FIG. 2, FIG. 5, FIG. 10, FIG. 13, etc., the vehicle hood 4 is located on the rear end side of the engine hood with respect to a portion 4a fixed to the vehicle body. A portion 4b that swings up and down around the axis and opens and closes, and a sheet metal member 35 attached to the outer surface side of the opening and closing bonnet portion 4b allows the outside of the space formed by the partition wall 34 and the control panel 12 to be outside. An external duct 36 is located. One end of the external duct 36 is connected to the protruding portion 34a of the partition wall 34, and the other end of the control panel in the cabin is inserted through a through hole 34b provided at one end of the partition wall 34 in the lateral direction of the vehicle body. Internal duct 37 that extends to the side of 12
Thus, an air intake duct 39 that allows the air-conditioning unit 20 to take in the outside air of the operation cabin 5 as air-conditioning air is configured.

That is, as shown in FIG. 13, the sheet metal member 3 is attached to an end of the external duct 36 located on both lateral outer sides of the opening / closing hood portion 4b of the engine bonnet 4.
A plurality of external air intake ports 40 each having an elongated through hole in the front-rear direction of the vehicle body are provided at an intermediate portion of the external duct 36 in the vehicle left-right direction, and at a central portion of the opening / closing hood portion 4b in the vehicle lateral direction. An outside air supply hole 41 formed by an opened through hole is provided.

The internal duct 37 has, at one end, an external air intake port 43 which communicates with the external air supply hole 41 of the external duct 36 via an external air filter 42, and the opening at the other end is formed in the through hole 34 b of the partition wall 34. A portion 37a which is located inside the engine hood in a state of facing, and a portion 37a inside the hood near the through hole 34b of the partition wall 34.
And a portion 37b located in the cabin with one end communicating with the outside air and the other end communicating with the outside air suction port 28 of the air conditioner unit 20. As shown in FIGS. 11 and 12, a portion 12 b of the control panel 12 which faces the internal intake port 29 of the air conditioner unit 20.
Further, there is provided a ventilation port 46 with a dust-removing net for allowing the air in the operation cabin to be sucked into the air conditioner unit 20 by the suction force of the blower fan 22.

The bonnet inner part 3 of the internal duct 37
7a is formed by the protruding portion 34a of the partition 34 and a sheet metal member attached to a wall surface of the protruding portion 34a facing the engine hood, and formed by the partition 34 and the control panel 12. Is located outside the space where it is located. The outside air filter 42 includes:
The outside air intake of the internal duct 37 so that it remains in the internal duct 37 even when the opening / closing hood portion 4b is raised and opened, and is located outside the space formed by the partition wall 34 and the control panel 12. 43.

The inside / outside air switching valve mechanism 47 can be freely switched between the inside air side and the outside air side by swinging operation of the operation part 47a. When the inside air side 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 opened. Is communicated with the inside of the intake guide 27, so that the blower fan 22 can suck the outside air of the cabin from the external intake port 40 of the intake duct 39. When it is switched to the inside air side, the outside air suction port 28 is switched to the closed side to enable the blower fan 22 to suck the cabin inside air from the internal suction port 29.

As shown in FIGS. 2 and 9, the front end portion 26a of the unit case 26 of the air conditioner unit 20 is provided.
And the air conditioner unit 2 is connected to the pair of left and right air outlets 25 of the front end portion 26a.
And a pair of air duct main bodies 48 provided inside the control panel 12 separately positioned on both lateral sides of the air conditioner unit 20 so as to be aligned with the vehicle body lateral direction, and the control panel portion 12.
A guide duct 12c provided on the inner surface side of b constitutes an air duct 49 for supplying temperature-controlled air from the air conditioner unit 20 to the six outlets 31 to 33.

As shown in FIG. 11, both the left air duct main body 48 and the right air duct main body 48 are located at an intermediate portion in the vertical direction, and have an introduction cylinder 48a and an opening opposite to the opening of the introduction cylinder 48a. Blower opening 48b opening toward the direction
And air blow openings 48c, 48d,
33, and is connected to the air outlet 25 of the unit case front end portion 26a by the introduction cylinder portion 48a to introduce temperature-controlled air from the heater core 23 of the air conditioner unit 20 into the upper and lower three air outlets 48b, 48c, 48
d and 33, and is supplied to the upper outlet 31 from the upper outlet 48a, blows out into the cabin from the upper outlet 31 and is supplied to the central outlet 32 from the middle outlet 48b. The air is blown into the cabin from the central outlet 32. The lower end opening 48d of the one ventilation duct main body 48 is connected to the guide cylinder 1 of the control panel portion 12b.
2c, the conditioned air from the air conditioner unit 20 is supplied to the foot outlet 33 via the guide cylinder 12c, and is blown into the cabin from the foot outlet 33. The lower end opening 33 of the other ventilation duct main body 48 forms the other foot outlet 33, and blows out the temperature-controlled air from the air conditioner unit 20 from the foot outlet 33 into the cabin.

The wind direction control devices 31 are provided at the upper left and right outlets 31.
a is provided. The wind direction control device 31a can be rotationally adjusted in a three-dimensional direction along a spherical support surface provided with a support member attached to the blower duct main body 48. The blowout direction of the temperature-controlled air blown into the cabin from the mouth 31 is to the left or right,
It can be adjusted to any direction, such as upward, downward, diagonal.

As shown in FIG. 3, FIG. 4, FIG. 7, etc., the extending end projects from the evaporator 21 to the inside of the engine hood through a through hole provided at one end of the partition wall 34 in the left-right direction of the vehicle body. The inlet and outlet 21a and the outlet 21b of the cooling medium of the evaporator 21 are formed by the metal pipes, and extend from the heater core 23 and the extending end side is the partition wall 3.
The inlet 23a and outlet 23b of the heating medium of the heater core 23 are formed by a metal pipe projecting into the engine bonnet from a through hole provided on the other end side of the vehicle body 4 in the left-right direction. As a result, the inlet and outlet 21a and the outlet 21b of the cooling medium of the air conditioner unit 20 project from the partition wall 34 toward the prime mover and are located on one side of the engine 3 in the vehicle longitudinal direction. The inlet 23a and outlet 23b of the medium protrude from the partition wall 34 toward the prime mover and are located on the other lateral side of the engine 3 when viewed in the vehicle longitudinal direction.

As shown in FIG. 7, the cooling medium inlet 21a
Is provided on the front side of the engine cooling radiator 53 by a cooling medium supply hose 52 provided with a receiver 51 provided in the middle of the pipe so as to pass through the side opposite to the side where the muffler muffler 50 of the engine 3 is located. Capacitor 5
4, and the cooling medium outlet 21b is connected to a heating medium suction side of a compressor 56 provided so as to be driven by the engine 3 near the front end of the engine 3 by a cooling medium reducing hose 55. A heat medium receiving side of the condenser 54 is connected by a cooling medium supply hose 57 which is connected so that the heat medium discharge side of the compressor 56 passes through a side opposite to the side of the engine 3 where the muffler muffler 50 is located. Connected to As a result, the cooling / heating medium circulates between the condenser 54 and the evaporator 21, and exchanges heat with the cooling air in the condenser 54, and then the evaporator 2.
In step 1, heat exchange is performed with the air for air conditioning.

The heating medium inlet 23a is piped so as to pass through the side of the engine 3 where the muffler muffler 50 is located, and is supplied with a heating medium supply hose 59 provided with a temperature control valve 58 on the way to cool the engine. Radiator 5
3 and connected to the heating medium outlet 23b,
The engine 3 is connected to a lower tank of the radiator 53 for cooling the engine by a heating medium return hose 60 which is piped so as to pass on the side of the muffler muffler 50 where the muffler 50 is located. As a result, the engine cooling water as a heating medium that has cooled the engine 3 and raised the temperature is supplied to the heater core 23 to exchange heat with air-conditioning air, and thereafter returns to the radiator 53.

As shown in FIGS. 2 and 6, an air conditioner switch 63, a temperature controller 64, and the like are provided on a portion of the control panel 12 located below the steering handle shaft 11a passing through the handle shaft hole. An air conditioner operation panel 66 having an inside / outside air switching device 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 on or off the drive of the blower fan 22. Adjust the air volume by changing the rotation speed. The temperature adjuster 64 is
The slide type slides along a guide groove of the operation panel 66. When the slide operation is performed, the operation section of the temperature control valve 58 is switched through an operation cable.
The inside / outside air switching device 65 is a slide type that slides along the guide groove of the operation panel 66. When the inside / outside air switching device 65 is slid, the operation unit 47a of the inside / outside air switching valve mechanism 47 is switched via an operation cable and a link mechanism. Manipulate.

That is, when the air conditioner switch 63 is switched to the entrance side, the blower fan 22 is driven, and the air conditioner unit 20 sucks and discharges the blower fan 22 to cause the air guide 27 to flow from the external air inlet 40 through the air inlet duct 39. Alternatively, air for air conditioning 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
And supplies cooling and heating to the evaporator 21 and the heater core 23. That is, the heater core 23 passes through the evaporator 21 from the rear side to the front side, and then passes through the heater core 23.
Is supplied so as to pass from the rear side to the front side, is cooled by the evaporator 21, and is heated by the heater core 23. The temperature-conditioned air after the cooling and the heating treatment is discharged from the heater core 23 toward the front of the vehicle body to remove the unit case 2.
6 into the center of the front end portion 26a in the left-right direction. Then, the left and right duct bodies 48 of the blow duct 49 supply the conditioned air from the air conditioner unit 20 to the upper outlet 3.
1. The air is supplied to each of the center outlet 32 and the foot outlet 33 and is blown out from each of the outlets 31 to 33 into the driving cabin.

When the temperature adjuster 64 is operated, the temperature adjusting valve 58 operates to adjust the amount of hot water supplied to the heater core 23. Then, the heating process by the heater core 23 changes,
The temperature of the conditioned air blown from each of the air outlets 31 to 33 changes. That is, temperature control of heating and cooling can be performed.

When the inside / outside air switching device 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 outside air of the cabin as air for air conditioning, and performs air conditioning while sending the outside air into the cabin. When the inside / outside air switching device 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 air in the cabin as air for air conditioning, and performs air conditioning while circulating the air in the cabin.

As shown in FIGS. 6 and 11, the control panel 1
2, the panel portion 12b facing the internal air inlet 29 of the air conditioner unit 20 is formed as a separate component from the other control panel portion, and is detachably attached to the other panel portion by the mounting screw 12d. Connected. As a result, when the panel portion 12b is removed, the inside air filter 44 is exposed in the cabin to facilitate cleaning and replacement.

As shown in FIG. 2 and the like, a heat insulating plate 70 is provided in the engine hood near the front side of the partition wall 34 in a state supported by the rear end 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 therebetween, and the air conditioner unit 20
This makes it difficult for heat such as heat dissipated in the engine hood to be transmitted to the air-conditioning air sucked from the engine.

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 through the external air supply hole 41 of the external duct 36 around the external air filter 42. ing. Accordingly, the outside air flowing 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 effect of the heat insulating plate 70 to prevent the internal duct 37 and the partition 34 from rising in temperature.

[Alternative Embodiment] FIG. 14 shows a part of a farm tractor having an air conditioner unit having an alternative embodiment. In this tractor, the air conditioner unit 20 is mounted on a control panel in an assembling posture shown in FIG. It is assembled on the back side of Twelve. 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 of the partition wall 34 that protrudes toward the prime mover side.
The heater core 1 and the heater core 23 are located on the vehicle body rear side of the blower fan 22, and the heater core 23 is assembled in an assembling posture in which the heater core 23 is located above the evaporator 21.

The projection 34a is attached to the wall surface of the partition 34 on the driving portion side of the projection 34a, and the projection 34a
The internal duct 75 communicating with the inside of the protruding portion 34a through the through hole a and the external duct 36 similar to the external duct 36 shown in FIG. An intake duct 76 to be taken in as air is formed.

An internal / external air switching valve mechanism 47 is provided inside a portion of the internal duct 75 located between the external air filter 42 and the air conditioner unit 20.

As shown in FIGS. 14 and 15, the air conditioner unit 20 has rear air vents 77 provided on both lateral sides of the rear end of the unit case 26 and two lateral sides at the upper end of the unit case 26. Temperature-controlled air is blown out from the upper blowing port 78 provided. The temperature-controlled air from the left and right rear ventilation ports 77 is supplied directly to the central outlet 32 of the control panel 12 from the rear ventilation port 77. The temperature-controlled air blown out from the left and right upper air outlets 78 is distributed to the upper and lower ends of the upper air outlet 78 by an air blow duct 79 connected to an introduction cylinder portion, and the air is blown through the upper end opening. Upper outlet 3 of control panel 12
1 and is blown out into the cabin. The opening at the lower end forms a foot outlet 33 from which temperature-controlled air is blown into the cabin.

[Brief description of the drawings]

Fig. 1 Side view of the whole agricultural tractor

FIG. 2 is a left side view of an air conditioner unit disposition portion.

FIG. 3 is a left side view of an air conditioner unit disposition portion.

FIG. 4 is a right side view of an air conditioner unit disposition portion.

FIG. 5 is a plan view of an air conditioner unit installation part.

FIG. 6 is a front view of a control panel.

FIG. 7 is a piping diagram for an air conditioner.

FIG. 8 is a rear view of the air conditioner unit.

FIG. 9 is a front view of an air duct.

FIG. 10 is a perspective view of an air conditioner unit.

FIG. 11 is a perspective view of an air duct main body and a control panel portion.

FIG. 12 is a front view of an arrangement portion of a foot outlet.

FIG. 13 is a sectional view of an external duct.

FIG. 14 is a side view of an arrangement portion of an air conditioner unit having another embodiment.

FIG. 15 is a front view of an air duct of an air conditioner unit having another embodiment.

[Explanation of symbols]

 3a Clutch housing 10 Instrument panel 11a Steering handle shaft 12 Control panel 13 Wiper motor 15, 17, 18 Operating tool 20 Air conditioner unit 21 Evaporator 22 Blower fan 23 Heater core 31 Outlet

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Shunosuke Iwata 64 Ishizukita-cho, Sakai City, Osaka Inside Kubota Sakai Works (72) Inventor Tokuhide Iwata 64 Ishizukita-cho, Sakai City, Osaka Kubo Co., Ltd. Inside the Sakai Works (72) Inventor Shigeo Shoen 64 Ishizukita-cho, Sakai City, Osaka Prefecture F-term in Kubota Sakai Works (Reference) 3L011 BA00 BP00

Claims (9)

[Claims] 1. An agricultural tractor provided with an air conditioner unit on a back side of a control panel, wherein an evaporator and a heater core of the air conditioner unit have a length in a longitudinal direction of the vehicle body when viewed from a side of the vehicle body. A farm tractor with a mounting position smaller than the length of the tractor. 2. The agricultural tractor according to claim 1, wherein an evaporator and a heater core of the air conditioner unit are arranged in a state of being arranged in a vehicle longitudinal direction. 3. The agricultural tractor according to claim 1, wherein the evaporator and the heater core of the air conditioner unit are arranged so that the heater core is located on the vehicle body front side of the evaporator. 4. The air conditioner unit according to claim 1, wherein the evaporator, the heater core, and the blower fan of the air conditioner unit are arranged so that the blower fan is displaced relative to the evaporator and the heater core in the vehicle longitudinal direction. Agricultural tractors according to. 5. The air-conditioning unit according to claim 1, wherein the evaporator, the heater core, and the blower fan of the air conditioner unit are arranged such that the blower fan is eccentric to one side of the vehicle body with respect to the evaporator and the heater core. 2. The agricultural tractor according to item 1. 6. The air conditioner unit according to claim 1, wherein the evaporator, the heater core, and the blower fan of the air conditioner unit are arranged in a state where the blower fan is located at a level lower than the arrangement level of the evaporator and the heater core. The agricultural tractor described. 7. The agricultural tractor according to claim 6, wherein a blower fan of the air conditioner unit is disposed near an upper portion of a clutch housing. 8. A blower fan of the air conditioner unit,
The vehicle according to any one of claims 1 to 7, wherein the vehicle is disposed so as to be displaced to one side of the vehicle body with respect to the steering handle shaft, and the operating tool for traveling is displaced to the other side of the vehicle body with respect to the steering handle shaft. The agricultural tractor according to any one of the preceding claims. 9. The air outlet for supplying temperature-controlled air from an air conditioner unit into a cabin is disposed so as to be displaced in a lateral direction of a vehicle body with respect to a wiper motor and an instrument panel. Or the agricultural tractor according to item 1.