JP4528227B2 - Air conditioning structure for cabin of agricultural tractor - Google Patents

Description

The present invention relates to a cabin air conditioning structure for an agricultural tractor in which an air conditioning unit is disposed at the rear of a roof portion of the cabin.

  To arrange the air conditioning unit, the front half of the roof part is formed on the descending ceiling part that bulges downward, the air conditioning unit is arranged at the front end of the descending ceiling part, and the rear side of the air conditioning unit and The air-conditioning duct was arrange | positioned in the airframe both-sides position, the blower outlet was provided in the air-conditioning duct, and the structure which sends a cool breeze to the pilot who is seated in the driver's seat was taken (for example, patent document 1).

Japanese Patent Laying-Open No. 2005-1537 (paragraph number [0016], FIGS. 1 and 2)

In the said structure, in order to accommodate an air conditioning unit, since the roof part was formed in the descent | fall ceiling part, there existed a possibility that a front upper view might be narrowed. Then, when performing the front loader work, there is a possibility that the workability may be deteriorated because it is difficult to confirm the work site scooped up by the bucket when sitting in the driver's seat. It was difficult to see traffic lights when driving on the road.
In addition, the air conditioning unit is positioned on the front side of the fuselage, and air conditioning ducts with a plurality of air outlets are arranged on both the left and right sides of the roof. Air-conditioned air from the air conditioning unit is blown out from the air outlet of the air conditioning duct. The cool air was sent to the driver. However, since the air outlet unit is far away from the air outlet corresponding to the driver, the air blowing resistance for sending out air is increased, and sufficient cool air may not be sent to the driver.

An object of the present invention is to provide an air conditioning structure for a cabin of an agricultural tractor capable of improving the forward upper field of view by devising the arrangement configuration of the air conditioning unit and sending sufficient cool air to the driver. The point is to provide.

(Constitution)
The invention according to claim 1 is an air conditioning structure for a cabin of an agricultural tractor in which an air conditioning unit is arranged at the rear part of the roof portion of the cabin.
The left and right horizontal air conditioning ducts are arranged on the front side of the airframe of the air conditioning unit on the left and right sides of the airframe, and the left and right horizontal air conditioning ducts branch left and right from the air conditioning unit and extend to the front of the roof portion. of to form the bent duct portion of the left and right bent in body inside the front end portion forms a downward air outlet for blowing conditioned air toward the front window of the cabin at the tip of the left and right bent duct portion, the right and left In addition to the air outlet formed at the tip of the bent duct portion, a downward air outlet is formed at the bent portion of the left and right bent duct portions, and the left bent duct portion is obliquely forward in plan view. It is configured in a shape that is obliquely bent toward the front right of the fuselage having a straight straight line portion in the right direction, and the right bent duct portion is a straight straight portion in the left forward direction of the fuselage in plan view. Airframe front There in that are configured in a shape that is bent obliquely directed toward, the effects thereof are as follows.

(Function and effect)
An air conditioning duct is disposed on the front side of the air conditioning unit. Thereby, it is not necessary to arrange the air conditioning unit on the front side of the body of the roof portion, and the front window position can be taken high. As a result, the front upper field of view was improved.
In addition, the cool air blown from the air outlet near the air conditioning unit on the air conditioning duct can be applied to the driver seated in the driver's seat. As a result, the cool air blown out from the air outlet close to the air conditioning unit and having a low blowing resistance can be sufficiently applied to the driver. Therefore, it is possible to increase the amount of cool air that acts on the driver simply by improving the air conditioning unit just behind the air conditioning duct.

(Constitution)
The invention according to claim 2 is the invention according to claim 1 ,
The roof portion is composed of a hollow, double-walled outer roof portion and an inner roof portion, and the left and right lateral air-conditioners are passed through a space formed between the downward surface of the outer roof portion and the inner roof portion. A duct is arranged.

As shown in FIGS. 1 and 2, the agricultural tractor cabin 1 has a vertical frame 2 of a frame B constituting the framework and a transparent glass surface covering a portion surrounded by the vertical frame 2. A side door 3, a rear side window 4, and a rear window 5 are provided, and includes an annular upper frame 6 provided over the upper surface of each vertical frame 2 and a roof portion 7 placed on the upper frame 6. Has been.

A driving control unit 8 is provided in the cabin 1, and the driving control unit 8 is provided with a steering handle 11 on a handle post 10 located on the engine bonnet 9 side. 12 is arranged.
An air conditioning unit A for air conditioning the cabin 1 is disposed on the roof portion 7.

Embodiment of the present invention
Hereinafter, description will be made according to the difference in the mounting form of the air conditioning unit A. First, as an embodiment of the present invention, as shown in FIG. 2 and FIG. 3, an air conditioning unit A is disposed behind an annular upper frame 6 provided over the upper surface of the longitudinal frame 2 to form a frame B. What is arrange | positioned in the state located in the upper side of an edge part is demonstrated. Here, the rear frame portion 6B located at the rear portion of the hood portion 7 in the annular upper frame 6 is referred to as a horizontal frame.

  The structure of the frame B for mounting the air conditioning unit A will be described. As shown in FIG. 2, the left and right vertical portions are connected to the bent portion of the connection between the front and rear frame portion 6A and the rear frame portion 6B as a horizontal frame in the annular upper frame 6. The orientation frames 2 and 2 are erected to serve as the window frame of the rear side window 4, and the support frame 6C is installed at a height position that extends over both the longitudinal frames 2 and 2 and one step below the rear frame portion 6B. It is.

The air conditioning unit A is placed in a state of being dropped between the upper surface of the support frame 6C and the adjacent vertical frames 2 and 2 that support the support frame 6C. Here, the support frame 6C is referred to as an air conditioning unit mounting portion.
As shown in FIG. 3, a pair of left and right brackets 16, 16 are attached to the upper surface of the support frame 6 </ b> C in a front-rear orientation, and the air conditioning unit A surrounded by the unit case 24 It is fixed by mounting.

The structure of the roof part 7 is demonstrated.
As shown in FIGS. 3 to 5, the roof portion 7 includes an outer roof portion 13 and an inner roof portion 14, and each is attached to and supported by the upper frame 6. The inner roof part 14 is an integrally molded product of resin, and the rear half part located above the driver's seat 12 is formed in a descending ceiling part bulging downward, and the air conditioning unit A is accommodated in the descending ceiling part. It is.

  As shown in FIGS. 2 and 3, the outer roof portion 13 is mounted on the upper surface of the upper frame 6 and has a flat plate shape wider than the mounting surface. A seal ring 19 having a rectangular cross section formed in a ring shape is attached to the downward surface of the outer roof portion 13, and a part of the cross section of the seal ring 19 is in a state where the outer roof portion 13 is placed on the upper frame 6. It abuts on the upper surface of the upper frame 6 to block the air flow from the outside.

As shown in FIGS. 3 to 5, outside air inlets 13 </ b> B and 13 </ b> B are formed on the downward surface of the lateral flange 13 </ b> E projecting to the both lateral sides of the upper frame 6 of the outer roof portion 13, and the seal ring 19. An outside air supply port 13 </ b> C communicating with the outside air introduction port 13 </ b> B is formed in a portion located inside the outside. In the figure, reference numeral 33 denotes a dustproof filter provided in the outside air inlet 13B.
The outside air taken in from the outside air inlet 13B is guided to the front side of the body through the communication path b as an outside air introduction duct formed in the double wall of the outer roof portion 13, and the outside air supply formed on the front side of the body of the communication path b. It is configured to blow out into a space a communicating with the air conditioning unit A described later from the mouth 13C.

The internal structure of the inner roof part 14 will be described. As shown in FIGS. 1 to 4, the air conditioning unit A includes an evaporator 20 and a heater 21 positioned in front of the evaporator 20, and the evaporator 20 cooperates with a compressor, an expansion valve, a condenser, and the like (not shown) as a refrigerant. A circulation circuit is configured. The heater 21 is connected to the radiator 22 in the engine bonnet 9 by piping.
A sirocco fan 23 is provided on the right side of the evaporator 20 to send the outside air taken in from the outside air supply port 13 </ b> C toward the evaporator 20 and the heater 21.

  As shown in FIG. 3, the outside air introduced from the outside air supply port 13 </ b> C is surrounded by the unit case 24 with the space a formed between the downward surface of the outer roof portion 13 and the inner roof portion 14 as a flow path. The suction is guided to the guide hole 24a of the sirocco fan 23.

  As shown in FIGS. 3 to 4, the evaporator 20 and the sirocco fan 23 are surrounded by a unit case 24, and the air conditioning unit is continuous from the unit case 24 toward both sides of the evaporator 20 toward the front side of the body. A rear air-conditioning duct 15A that guides the air-conditioned air from A to the left and right lateral ends is provided, and the horizontal air-conditioning ducts 15B and 15B extend forward from both side ends of the rear air-conditioning duct 15A. .

  The left and right horizontal air conditioning ducts 15B and 15B will be described. As shown in FIGS. 3 to 5, the left and right lateral air-conditioning ducts 15 </ b> B and 15 </ b> B are provided with inward air outlets 15 b and 15 b, and the rear air outlets 15 b and 15 b are close to the driver's face. It is positioned to send an appropriate amount of cool breeze. On the other hand, at the front ends of the horizontal air-conditioning ducts 15B and 15B, the front downward air outlets 15a and 15a for blowing the air-conditioning air toward the front window 25 of the cabin 1 are directed to the door glass behind the air outlets 15a and 15a. An air outlet 15d for blowing a defrost wind is formed. Left and right bent duct portions 15E and 15E are formed at the front end portions of the left and right horizontal air conditioning ducts 15B and 15B, and air outlets 15a and 15a are formed at the distal end portion and the bent portion 15Ea of the bent duct portion 15E, respectively. Yes.

  As shown in FIGS. 2 and 3, branch ducts 15 </ b> C and 15 </ b> C extend from both side ends of the rear air-conditioning duct 15 </ b> A toward the rear side, and conditioned air is supplied to the rear side window 4 and the rear window 5 at the extended ends. Air outlets 15c and 15c for blowing out are provided. The horizontal air-conditioning duct 15B and the like described above are located in the inner roof portion 14, and are provided in a descending ceiling portion formed on both side ends of the inner roof portion 14 as shown in FIG.

  As shown in FIG. 3, a circulation port 14 </ b> A is provided on the front side of the airframe from the storage part of the air conditioning unit A of the inner roof part 14 in order to take in air in the cabin. The circulation port 14A is formed in a horizontal portion at the upper end of the raised portion 14c by raising the wall surface along the unit case 24 upward from the upper surface of the inclined surface forming the descending ceiling portion of the lower inner roof portion 14b. ing. Here, the rising portion 14c of the upper inner roof portion 14a is referred to as an inside air introduction duct.

On the other hand, the outside air supply port 13C and the circulation port 14A are positioned so as to face each other vertically, and an open / close valve body 17 is provided between them as a valve mechanism for opening and closing the outside air supply port 13C and the circulation port 14A. is there. A state in which outside air is taken into the space a formed between the inner roof portion 14 and the outer roof portion 13 through the outside air inlet 13B, and a state in which the outside air is blocked and the air in the cabin is circulated between the space a. It is comprised so that it may switch to.
The valve mechanism may be a slide type instead of a swing type. Although not shown, a switching operation lever for operating the valve mechanism is provided so as to be lowered to the vicinity of the upper part of the driver's seat 12.

  As shown in FIG. 3, the inner roof portion 14 includes a circulation port 14A for taking in air in the cabin, but the rear upper inner roof portion 14a and the cabin 1 that form the circulation port 14A are provided. And a front inner roof portion 14b positioned on the front side. The inner roof portion 14 is in close contact with the outer roof portion 13 at an intermediate position in the longitudinal direction of the machine body, and is separated into a rear inner roof portion 14a and a front inner roof portion 14b at the close intermediate position. By storing and installing the CD radio cassette 29 and the like in the space of the front inner roof portion 14b having such a configuration, the back pressure of the indoor air taken in from the circulation port 14A does not directly act on the CD radio cassette 29 and the like, and the CD radio cassette 29 And the like are less likely to inhale dust and the like.

  As shown in FIGS. 3 to 5, since the outside air introduction port 13 </ b> B is arranged near the air conditioning unit A, the communication path b formed in the outer roof portion 13 so as to communicate with the outside air introduction port 13 </ b> B is shortened. Inhalation resistance by the sirocco fan 23 can be reduced.

  A support cover 18 extends on the rear side of the support frame 6C and covers the air conditioning unit A. The rear window 5 is supported on the support frame portion 6C on the lower surface of the support cover 18 so as to be swingable rearward around the horizontal axis X. In the closed state, the rear window 5 is prevented from projecting to the rear side. Although not shown in the figure, a configuration is adopted in which interference with a link mechanism or the like that supports a tilling device or the like is avoided.

[First Embodiment]
Next, as a first alternative embodiment, as shown in FIG. 6, an air conditioning unit A that is disposed in a state of being located on the front side of the machine body from the rear end portion of the annular upper frame 6 will be described.

  As shown in FIGS. 6 and 7, the outer roof portion 13 and the inner roof portion 14 are disposed so as to surround the air conditioning unit A, and the outside air supply port 13 </ b> C and the outside air supply are provided on the front side of the air conditioning unit A of the outer roof portion 13. An outside air introduction port 13B for sending outside air to the mouth 13C is provided on the downward surface of the flange portion 13A projecting to the rear side of the outer roof portion 13. The inner roof portion 14 is provided with a circulation port 14A for introducing the air in the cabin 1 in a state of being opposed to the outside air supply port 13C, and the outside air supply port 13C is provided between the outside air supply port 13C and the circulation port 14A. An on-off valve body 17 is provided as a valve mechanism for opening and closing the circulation port 14A. A state in which outside air is taken into the space a formed between the inner roof portion 14 and the outer roof portion 13 through the outside air inlet 13B, and a state in which the outside air is blocked and the air in the cabin is circulated between the space a. It is comprised so that it may switch to.

The air taken into the space a is sucked into the sirocco fan 23 through a guide hole 24a formed in the upper surface of the unit case 24 of the air conditioning unit A, and after being air-conditioned by the evaporator 20 or the like, the air conditioning duct 15A, It is pushed into 15B.
As shown in FIG. 4, the rear air-conditioning duct portion 15A extends from both ends of the evaporator 20 as described above, and then the horizontal air-conditioning ducts 15B and 15B extend from both side ends of the air-conditioning duct portion 15A toward the front of the body. As in the above-described embodiment of the present invention, the adjusted air is blown out into the cabin 1.

  Next, a mounting structure for the rear side window 4 and the rear window 5 will be described. 7 shows that the air conditioning unit A is disposed on the front side of the body at the rear end portion of the annular upper frame 6, and the air conditioning unit A is disposed on the front side of the body of the rear end portion of the annular upper frame 6. In order to adopt the configuration, the rear end portion of the annular upper frame 6 is displaced rearward from the position of the rear window 5. For this purpose, the rear pillar as the longitudinal frame 2 located at the boundary between the rear window 5 and the rear side window 4 and the upper frame 6 are connected by the joint frame 30 to enhance the connection strength between the frames. The rear window 5 is supported by a swing arm 32 pivotally supported by a bracket 31 attached to the rear frame portion 6B of the upper frame 6 so that the rear window 5 can swing back and open.

[Second Embodiment]
Next, as a second alternative embodiment, the air conditioning unit A will be described below as shown in FIG. 8, which is disposed below the hanging frame portion 6D formed on the rear frame portion 6B as a horizontal frame.
The structure of the frame B for mounting the air-conditioning unit A will be described. As shown in FIGS. 8 and 9, the left and right vertical orientations are formed at the connection bent portion between the front and rear frame portion 6A and the rear frame portion 6B in the annular upper frame 6. The frames 2 and 2 are erected to serve as the window frame of the rear side window 4, and the suspended frame portion 6D is extended to the height position that is one step higher than the rear frame portion 6B across the longitudinal frames 2 and 2. It is erected.

The air conditioning unit A is suspended and supported between the lower surface of the hanging frame portion 6D and the adjacent vertical frames 2 and 2 that support the hanging frame portion 6D. Here, the suspended frame portion 6D is referred to as an air conditioning unit mounting portion.
As shown in FIG. 9, a pair of left and right brackets 27 are attached to the lower surface of the hanging frame portion 6D in a front-rear orientation, and the air conditioning unit A surrounded by the unit case 24 is fixed to the left and right brackets 27, 27 with bolts. It is constituted as follows.

  As shown in FIG. 9, an outer roof portion 13 and an inner roof portion 14 are arranged so as to surround the air conditioning unit A, and an outside air supply port 13 </ b> C is provided on the front side of the air conditioning unit A of the outer roof portion 13. An outside air introduction port (not shown) for sending outside air to the mouth 13C is provided in a collar portion (not shown) projecting to the lateral side of the body of the outer roof portion 13. The inner roof portion 14 is provided with a circulation port 14A for introducing the air in the cabin 1 in a state of being opposed to the outside air supply port 13C, and the outside air supply port 13C is provided between the outside air supply port 13C and the circulation port 14A. An on-off valve body 17 is provided as a valve mechanism for opening and closing the circulation port 14A. A state in which outside air is taken into the space a formed between the inner roof portion 14 and the outer roof portion 13 through the outside air introduction port 13B, and a state in which the outside air is blocked and the air in the cabin 1 is circulated between the space a. It is comprised so that it may switch to.

The air taken into the space a is sucked into the sirocco fan 23 through a guide hole (not shown) formed in the upper surface of the unit case 24 of the air conditioning unit A, and after being air-conditioned by the evaporator 20 or the like, It is pushed into the air conditioning ducts 15A and 15B.
As shown in FIG. 4, as described above, the rear air-conditioning duct portion 15A extends from both ends of the evaporator 20, and then the horizontal air-conditioning ducts 15B and 15B extend from both side ends of the air-conditioning duct portion 15A toward the front of the body. As in the above-described embodiment of the present invention, the adjusted air is blown out into the cabin 1.

  As shown in FIG. 9, a rear window 5 is supported on the lower surface of the portion of the inner roof portion 14 that protrudes rearward from the longitudinal frame 2, and is not shown to suppress the protrusion to the rear side. In this configuration, interference with a link mechanism or the like that supports a tilling device or the like is avoided.

[Third Embodiment]
Next, as a third alternative embodiment, a description will be given of the case where the air conditioning unit A is arranged further rearward of the rear frame portion 6B as a horizontal frame as shown in FIG.
The structure of the frame B to which the air conditioning unit A is attached will be described. As shown in FIGS. 10 and 11, the left and right vertical orientations are formed at the connecting bent portion between the front and rear frame portions 6A and 6B in the annular upper frame 6. Frames 2 and 2 are erected to serve as a window frame for the rear side window 4.

As shown in FIG. 11, a pair of left and right brackets 27 are attached to the lower surface of the rear frame portion 6B in the front-rear orientation, and the air conditioning unit A surrounded by the unit case 24 is fixed to the left and right brackets 27, 27 with bolts. It is constituted as follows.
As shown in FIG. 11, the rear cover 28 is attached to the rear frame portion 6B so as to surround the air conditioning unit A attached to the rear frame portion 6B, and the outer roof portion 13 is supported by the rear frame portion 6B. The inner roof portion 14 is disposed in a state of being provided and supported by the rear cover 28.

  The outer roof portion 13 is provided with an outside air supply port 13 </ b> C, and an outside air introduction port (not shown) for sending outside air to the outside air supply port 13 </ b> C projects to the lateral side of the outer roof portion 13. Is provided. The inner roof portion 14 is provided with a circulation port 14A for introducing the air in the cabin 1 in a state of being opposed to the outside air supply port 13C, and the outside air supply port 13C is provided between the outside air supply port 13C and the circulation port 14A. An on-off valve body 17 is provided as a valve mechanism for opening and closing the circulation port 14A. A state in which the outside air introduced from the outside air introduction port 13B is taken into the internal space a of the rear cover portion 28 through the space between the inner roof portion 14 and the outer roof portion 13, and the outside air is blocked and the air in the cabin is separated from the internal space a. The on-off valve body 17 is configured to be switched to a state of circulating between them. In the figure, b is an outside air introduction guide, and 14c is an inside air introduction guide.

The air taken into the space a is sucked into the sirocco fan 23 through a guide hole 24a formed in the upper surface of the unit case 24 of the air conditioning unit A, and after being air-conditioned by the evaporator 20 or the like, the air conditioning duct 15A, It is pushed into 15B.
As shown in FIG. 4, a rear air conditioning duct portion 15A is disposed in front of the evaporator 20, and then the lateral air conditioning ducts 15B and 15B are extended from both side ends of the air conditioning duct portion 15A toward the front of the body. Similar to the embodiment of the present invention, the adjusted air is blown out into the cabin 1.
A rear window 5 is supported on the lower surface of the connection portion between the inner roof portion 14 and the rear cover portion 28, and is not shown in the figure to suppress rearward overhanging. The structure which avoids interference with these etc. is taken.

[Another embodiment]
About another implementation structure described below, it shall apply to the said embodiment of the said invention, and the 1st-3rd another embodiment.

(1) Although not shown, a bellows-like connecting portion may be provided at the connecting portion between the left and right horizontal air conditioning ducts 15B, 15B and the rear air conditioning duct 15A. Then, expansion and contraction of the duct itself and manufacturing errors can be absorbed, and the connection state is stabilized.

(2) The outer roof portion 13 may have a configuration in which a flange portion protruding laterally from the upper frame 6 or in the front-rear direction is formed to prevent direct sunlight from entering a cabin having a large glass surface.

Overall side view of tractor The perspective view which shows the frame frame in embodiment of this invention Side view of a longitudinal section in a cabin according to an embodiment of the present invention FIG. 2 is a cross-sectional plan view showing the inner surface of the inner roof portion viewed from the outer roof side in FIG. Front view showing the duct arranged on the side of the roof The perspective view which shows the frame frame in 1st another embodiment Longitudinal side view showing the mounting structure of the air conditioning unit in the first embodiment The perspective view which shows the frame frame in 2nd another embodiment Longitudinal side view showing mounting structure of air conditioning unit in second embodiment The perspective view which shows the frame frame in 3rd another embodiment Longitudinal side view showing mounting structure of air conditioning unit in third embodiment

DESCRIPTION OF SYMBOLS 1 Cabin 7 Roof part 13 Outer roof part 14 Inner roof part 15B Horizontal air-conditioning duct 15E Bending duct part 15Ea Bending part 15a Air outlet
25 Front window A air conditioning unit

Claims (2)

An air conditioning structure for an agricultural tractor cabin in which an air conditioning unit is arranged at the rear of the roof of the cabin,
The left and right horizontal air conditioning ducts branched from the air conditioning unit to the left and right and extended to the front part of the roof portion are arranged at the left and right sides of the airframe on the front side of the airframe unit.
To form the bent duct portion of the left and right bent in body inside the front end portion of the left and right lateral air-conditioning duct, the downward air outlet for blowing conditioned air toward the front window of the cabin at the tip of the left and right bent duct portion Form the
Separately from the air outlets formed at the front ends of the left and right bent duct portions, a downward air outlet is formed at a bent portion of the left and right bent duct portions,
The left bent duct portion is configured in a shape that is bent obliquely toward the right front of the fuselage having a straight straight portion that is straight in the forward direction of the oblique aircraft in plan view, and the right bent duct portion is planar An air conditioning structure for a cabin of an agricultural tractor that is configured to be bent obliquely toward the left front of the airframe having a straight line portion that is straight in a leftward direction toward the front of the airframe . The roof portion is composed of a hollow and double-wall outer roof portion, and an inner roof portion,
Cabin air-conditioning structure for agricultural tractor according to claim 1, wherein through the space formed is arranged the left and right lateral air-conditioning duct between the downward surface and the inner roof portion of the outer roof section.

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