JP4063590B2 - Tractor air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner for a tractor in which an air conditioning unit is provided on the back side of an operation panel.
[0002]
[Prior art]
In the tractor, the outside air intake port of the vehicle body is communicated with the air intake port of the air conditioning unit through the air intake duct, and the temperature-controlled air sent out by the air conditioning unit is sent to the air outlet in the operation cabin through the air duct. For this reason, conventionally, as shown in, for example, Japanese Patent Application Laid-Open No. 2002-87041, an intake duct and a blower duct that are separately manufactured have been adopted.
[0003]
[Problems to be solved by the invention]
Conventionally, the space required for installation of the intake duct and the air duct has become large, and the vehicle body has been enlarged accordingly, and it has been difficult to arrange and assemble the air intake duct and the air duct. In addition, the vehicle body tends to be heavy due to the intake duct and the air duct.
[0004]
An object of the present invention is to provide an air conditioner for a tractor that can be equipped with an intake duct and a blower duct while easily avoiding the above-described problems.
[0005]
[Means for Solving the Problems]
The configuration, operation, and effect of the invention according to claim 1 are as follows.
[0006]
〔Constitution〕
In the tractor air conditioner that has an air conditioning unit on the back of the operation panel,
An air intake duct that communicates the air inlet of the air conditioning unit with an outside air intake of the vehicle body, an air duct that sends the temperature-controlled air sent out by the air conditioning unit to the air outlet in the operating cabin, and the outside air intake of the vehicle body A sheet metal structure having an air inlet ; and a unit-side intake duct having one end communicating with an air passage formed by the sheet metal structure and the air duct and the other end communicating with the air inlet of the air conditioning unit . Configure
The sheet metal structure is formed into a shape having a peripheral wall portion having a U-shaped cross section in plan view, and the blower duct has one end side in plan view as a peripheral wall portion on one end side in the left-right direction of the sheet metal structure. The U-shape of the sheet metal structure is sandwiched so that the one end side of the unit-side intake duct is sandwiched between the sheet metal structure and the peripheral wall portion on the other side of the sheet metal structure opposite to each other. It is arranged so as to enter the opening side of the peripheral wall portion.
[0007]
[Action]
An air intake duct is constituted by the air duct and the sheet metal structure having a cross-sectional groove shape whose opening is closed by the air duct, and the air duct also serves as a part of the air intake duct. Compared to the conventional structure in which the duct is entirely composed of a member different from the air duct, the air intake duct is reduced in weight, and the space required for installing the air intake duct and the air duct is reduced. Thus, an intake duct and an air duct can be configured.
[0008]
〔effect〕
Accordingly, the weight of the intake duct is reduced, the vehicle body is also reduced in weight, and the space required for installation of the intake duct and the air duct is reduced, so that the vehicle body is also reduced in size and easier to handle and handle. In addition, the intake duct and the air duct can be easily arranged or assembled in a small installation space.
[0009]
The structure, operation, and effect of the invention according to claim 2 are as follows.
[0010]
〔Constitution〕
In the configuration of the invention according to claim 1, the air duct is configured by a unit case that houses a heat exchanger of the air conditioning unit.
[0011]
[Action]
Since the air duct is configured by a unit case of the air conditioning unit, and the air duct and the air conditioning unit are an integral part, the air duct can be assembled all at once by assembling the air conditioning unit.
[0012]
〔effect〕
When assembling the air conditioner, the air conditioning unit and the air duct can be assembled at a time and efficiently.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, a pair of left and right steering operations and driveable front wheels 1, a pair of left and right driveable rear wheels 2, a driving unit equipped with an engine 3 located at the front of the vehicle body, and a driving cabin 5 A lift arm 7 is provided on both lateral sides of the transmission case 6 forming the rear part of the self-propelled vehicle body provided with slidable operation, and a power take-off shaft 8 is provided at the rear end of the transmission case 6. The tractor is configured.
This tractor is connected to the rear part of the vehicle body so that a rotary tiller (not shown) is lifted and lowered by the lift arm 7, and the driving force from the engine 3 is transmitted to the rotary tiller by the power take-out shaft 8. Thus, a riding type working machine is constructed by connecting various working devices to the rear part of the vehicle body so as to be lifted and driven freely, such as constituting a riding type tiller.
[0014]
As shown in FIG. 2, FIG. 5, etc., an air conditioning unit 20 is provided on the back side of the driving panel 12 positioned in front of the driving seat 9 in the driving cabin, and as shown in FIG. The upper outlet 31 installed in the rearward direction of the vehicle body at the part located on both sides above the instrument panel 10 for displaying the traveling speed, the amount of fuel for the engine, etc., and the instrument panel 10 of the operation panel 12 slightly. A central outlet 32 installed at the lower side of the vehicle and facing the rear of the vehicle body, and a foot outlet 33 installed at the lateral ends near the lower end of the operation panel 12 and facing the rear of the vehicle body. Is provided inside the operation cabin 5 to constitute an air conditioner for the operation section.
[0015]
As shown in FIG. 9 and the like, the air-conditioning unit 20 includes an outside air intake port 28 facing upward in the vehicle body, an inside air intake port 29 facing slightly downward in the lateral direction of the vehicle body, and an intake air switching valve 47. The resin unit case 26 attached to the housing, the blower fan 22 housed inside the lower end side of the unit case 26 as shown in FIG. 11, and the unit case 26 so as to drive the blower fan 22. An electric fan motor M attached to the lateral side of the lower end portion and an evaporator 21 and a heater core 23 as a heat exchanger housed inside the upper end side of the unit case 26 as shown in FIG. It is.
[0016]
As shown in FIG. 7, the evaporator 21 of the air conditioning unit 20 includes a detachable lower engine bonnet 4 a with a driving portion, and an upper engine bonnet 4 b that can swing up and down around an axis on the rear end side. A compressor body 56 located near the upper end of the front end of the engine 3 inside the engine bonnet 4, and a condenser main body 54 a in a condenser unit 54 located near the front surface of the engine cooling radiator 53 in the engine bonnet 4, The heater core 23 connects the engine 3 and the engine cooling radiator 53 to a receiver 54b connected to the lateral end of the capacitor body 54a by a refrigerant circulation pipe 52 made of a metal pipe or a rubber pipe. Metal pipes and rubber for the connected cooling water circuit 59 Are connected by heat medium circulation pipe 60 is provided with a temperature control valve 58 with made in type.
[0017]
As shown in FIGS. 2 and 5, the outside air intake port 28 of the air conditioning unit 20 extends over the entire width of the upper engine bonnet 4b on the outer surface side of the rear end of the upper engine bonnet 4b as shown in FIGS. With the gap between the upper engine bonnet 4b and the intake guide plate 35 with respect to the long hole-type outside air intake port 40 provided with the intake guide plate 35 and provided on both sides of the rear end of the upper engine bonnet 4b. An outside air filter 42 having an upper end entering a through hole 41 located in a central portion of the rear end portion of the upper engine bonnet 4b in the left-right direction, one end connected to the lower end side of the outside air filter 42, and the like The end side is communicated with each other through each of the intake ducts 37 connected to the outside air intake port 28.
[0018]
As shown in FIG. 11, the inside air intake port 29 of the air conditioning unit 20 is opened inside the operation cabin 5 through an opening 46 provided at the lower end of the lateral wall portion 12 b of the operation panel 12.
[0019]
As shown in FIG. 9 and the like, the temperature-controlled air is sent out from the pair of left and right ventilation ports 25 toward the rear of the vehicle body by a portion located on the upper side of the unit cover 26 of the air conditioning unit 20 and on the front side of the evaporator 21 and the heater core 23. An air duct 26a is configured. That is, as shown in FIG. 5, the air duct 26a diverts the temperature-controlled air blown from the evaporator 21 and the heater core 23 toward the front of the vehicle body to the left and right sides of the vehicle body by the mountain-shaped diverter 26b. The temperature-controlled air that has been diverted from the left side of the vehicle body to the left side of the vehicle body is guided by the left guide portion 26c toward the rear of the vehicle body, and is sent out from the left air blowing port 25. 26c is configured to be guided rearwardly of the vehicle body and sent out from the right air outlet 25.
[0020]
The left air outlet 25 in the air duct 26a of the air conditioning unit 20 is connected to the air outlet 25 by an inlet 48a and is provided with three outlets 48b to 48d by the left air duct 48 as shown in FIG. The left upper air outlet 31, the central air outlet 32, and the foot outlet 33 are communicated with each other, and the right air outlet 25 in the air duct 26 a of the air conditioning unit 20 is connected to the air outlet 25. Connected to the right upper air outlet 31, the central air outlet 32, and the foot air outlet 33 of the operation panel 12 by a right air duct 48 as shown in FIG. 10 with three outlets 48 b to 48 d. I'm allowed.
[0021]
Thus, the intake air switching tool 65 provided in the air conditioning control panel 66 (FIG. 2) provided with the intake air switching valve 47 and the temperature control valve 58 at a position located below the steering handle 11 of the operation panel 12. By operating the fan motor M by operating with the temperature adjusting tool 64, the air conditioner can be air-conditioned.
[0022]
That is, when the fan motor M is driven and operated, the blower fan 22 is driven by the fan motor M to perform a blowing action. Then, by this air blowing action, the air outside the cabin passes from the outside air intake port 40 of the upper engine bonnet 4b through the air passage 36, the outside air filter 42, the intake duct 37, and the outside air intake port 28 of the unit case 26 to the cabin. The air inside is sucked into the inside of the unit case 26 through the opening 46 of the operation panel 12 and the inside air inlet 29 of the unit case 26. The air sucked into the unit case 26 is supplied to the evaporator 21, is cooled by the refrigerant supplied to the evaporator 21 by the refrigerant circulation pipe 52, and further supplied to the heater core 23, so that the heater core 23 has a heat medium. Heat treatment is performed with hot water supplied by the circulation pipe 60, air is set at a set temperature set by adjustment of the temperature control valve 58, and is blown to the air duct 26 a, and left and right by the air duct 26 a and the left and right air ducts 48. Are sent to the upper outlet 31, the central outlet 32, and the foot outlet 33, respectively, and jetted from the outlets 31, 32, 33 into the operation cabin 5.
When the intake switching valve 47 is switched to the outside air suction side, the outside air inlet 28 is adjusted so as to be opened larger than the inside air inlet 29, and the cabin outside air is sucked into the air conditioning unit 20 in a large amount to be air-conditioned, and the inside air suction is performed. When switched to the side, the inside air inlet 29 is adjusted so as to open larger than the outside air inlet 28, and the cabin air is sucked into the air conditioning unit 20 in a large amount to be air-conditioned.
[0023]
As shown in FIGS. 2 and 5, the intake duct 37 that communicates the outside air intake port 28 of the air conditioning unit 20 and the outside air intake port 40 of the upper engine bonnet 4b is connected to the outside air filter 42 by an air inlet 38a. The filter-side intake duct 38 to which the filter is connected, and a resin-made unit-side intake duct that is manufactured as a separate part from the filter-side intake duct 38 and has one end connected to the air outlet 38b of the filter-side intake duct 38 39 (FIG. 9).
[0024]
As shown in FIGS. 2 and 5, the filter-side intake duct 38 has a cross-sectional shape when the end surface cut in a direction along the vehicle longitudinal direction is viewed in the direction along the vehicle lateral direction. A sheet metal structure 70 formed by combining sheet metals so as to have a groove shape having an opening 70 a facing the rear of the vehicle body and the air duct 26 a of the air conditioning unit 20 are configured.
[0025]
That is, the blower duct 26a enters the opening 70a of the sheet metal structure 70, and only a part of one end side of the opening 70a in the lateral direction of the vehicle body is left open, and the unit side intake duct 39 is connected. An air passage extending from the air inlet 38a to the air outlet 38b is formed between the inner surface side of the sheet metal structure 70 and the outer surface side of the blower duct 26a so as to close the opening 70a so as to become the air outlet 38b. Thus, the air duct 26a and the sheet metal structure 70 are combined. That is, the blower duct 26a is configured to be a part of the filter side intake duct 38. And between the said sheet-metal structure 70, the said ventilation duct 26a, and the said unit side intake duct 39, the sealing material 71 made from the sponge which seals between these is interposed.
In short, the sheet metal structure 70 is formed in a shape having a peripheral wall portion 70a having a U-shaped cross section in plan view. The air duct 26a is placed in a state where one end side of the air duct 26a in a plan view is in contact with the inner surface side of the peripheral wall portion 70a on one end side in the left-right direction of the sheet metal structure 70 via the air duct 48 and the sealing material 71. The air passage of the filter side intake duct 38 is formed by entering the opening 70 a of the sheet metal structure 70. The other end side of the air duct 26a in plan view and the peripheral wall portion 70a on the other end in the left-right direction of the sheet metal structure 70 are opposed to each other. One end side of the unit side intake duct 39 is sandwiched by a seal member 71 by the peripheral wall portion 70a of the structure 70, and the unit side intake duct 39 is communicated with the filter side intake duct 38.
[0026]
As shown in FIG. 7, the fan shroud 75 that covers the periphery of the rotary fan 74 that supplies cooling air to the engine cooling radiator 53 is suppressed from the intake of hot air heated by the engine 3 to the engine cooling radiator 53. In this way, the engine bonnet is integrally formed with a heat insulating plate 76 that partitions the engine cooling radiator 53 and the engine 3. That is, as shown in FIGS. 13 and 14, the fan shroud 75 and the heat insulating plate 76 are produced by drawing the plate.
[0027]
As shown in FIG. 4, FIG. 8, etc., the refrigerant circulation pipe 52 partitions the engine hood and the operation cabin so as to prevent the hot air in the engine bonnet from flowing into the operation cabin. A heat insulating plate 77 made of a material constituting the sheet metal structure 70 of the filter-side intake duct 38 is penetrated, and is attached to the heat insulating plate 77 by the attachment structure shown in FIGS. 15 and 16.
[0028]
That is, a support bracket in which a pair of halved pipe stays 78 including a flat plate portion 78a and a flange portion 78b protruding from the outer peripheral edge portion of the flat plate portion 78a over the entire circumference of the flat plate portion 78a are fixed to the heat insulating plate 77. 79 is supported by the support bracket 79 via a connecting bolt 80 that fastens and connects the flange portion 78b to the flange 79b. Due to the tightening force by the connecting bolt 80, the pair of half pipe stays 78 are configured to sandwich each of the pair of refrigerant circulation pipes 52 via a rubber cushion material 81. By sealing the pipe hole 77a of the heat insulating plate 77 over the whole by a sponge sealing material 82 adhered to the side opposite to the side where the half pipe stay 78 is attached, the half of the heat insulating plate 77 is closed. A gap 83 formed between the split pipe stay 78 and the cushion material 81 is sealed so that hot air on the engine bonnet side does not pass.
[0029]
[Another embodiment]
In order to carry out the invention according to claim 1, the air guide 26 a is implemented by adopting the air guide composed of the unit case 26 of the air conditioning unit 20 as in the above-described embodiment. It may be carried out by adopting the air blowing guide produced in the above.
[Brief description of the drawings]
FIG. 1 is a side view of the entire tractor. FIG. 2 is a left side view of an air conditioning unit installation section. FIG. 3 is a left side view of an air conditioning unit installation section. 5] Cross-sectional view of the intake duct [Fig. 6] Front view showing the arrangement of the outlets [Fig. 7] Plan view showing the piping [Fig. 8] Rear view of the air-conditioning unit installation section [Fig. 9] Air-conditioning unit and unit-side intake FIG. 10 is a perspective view of the air duct. FIG. 11 is a rear view of the air intake unit of the air conditioning unit. FIG. 12 is a cross-sectional view of the air intake duct. FIG. 13 is a side view of the fan shroud. Rear view [Fig. 15] Rear view of refrigerant circulation pipe fixing part [Fig. 16] Cross-sectional view of refrigerant circulation pipe fixing part [Explanation of symbols]
4b Engine bonnet 12 Operation panel 20 Air conditioning unit 21, 23 Heat exchanger 26 Unit case 26a Air duct 28 Air inlet 31, 32, 33 Air outlet of air conditioning unit 38 Air inlet duct 40 Outside air inlet 70 Sheet metal structure 70a Opening

Claims (2)

A tractor air conditioner with an air conditioning unit on the back of the operation panel,
An air intake duct that communicates the air inlet of the air conditioning unit with an outside air intake of the vehicle body, an air duct that sends temperature-controlled air sent out by the air conditioning unit to the air outlet in the operating cabin, and the outside air intake of the vehicle body A sheet metal structure having an air inlet, and a unit side intake duct having one end communicating with an air passage formed by the sheet metal structure and the air duct and the other end communicating with the air inlet of the air conditioning unit . Configure
The sheet metal structure is formed into a shape having a peripheral wall portion having a U-shaped cross-section in plan view, and the air duct is configured such that one end side in plan view is a peripheral wall portion on one end side in the left-right direction of the sheet metal structure. The U-shape of the sheet metal structure is held so that the one end side of the unit-side intake duct is sandwiched between a peripheral wall portion on the other side of the sheet metal structure that is in contact with and opposite to the other side. An air conditioner for a tractor arranged so as to enter the opening side of the peripheral wall portion .   2. The tractor air conditioner according to claim 1, wherein the air duct is constituted by a unit case that houses a heat exchanger of the air conditioning unit.

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