JP4456340B2 - Air conditioning structure for cabin of agricultural tractor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention forms the downlink ceiling that bulges downward first half of the roof portion provided with a OPERATION steering unit, agricultural tractor is provided an air conditioning unit having a heater and the evaporator in the downlink ceiling This relates to the cabin air conditioning structure.
[0002]
[Prior art]
In the conventional structure, provided with a front air outlet to the horizontal center position of the lower Ri ceiling, has been provided that the air conditioning unit on the rear side of the front air outlet (e.g., Patent Document 1 see).
[0003]
[Patent Document 1]
JP-A-8-216672 Publication (stage No.落番[0020], FIG. 1, FIG. 2)
[0004]
[Problems to be solved by the invention]
In the above configuration, since the front outlet and the air conditioning unit are arranged at the front and rear, the air conditioning unit projects rearward, and the rear end of the descending ceiling portion extends to the upper side of the driver seat. As a result, the driver was cramped.
Therefore, it is conceivable to move the control seat backward, but in this case, the cabin itself is increased in size, which has been an obstacle to downsizing the agricultural tractor .
[0005]
An object of the present invention is to provide an air conditioning structure for a cabin of an agricultural tractor that can prevent an increase in size of the cabin itself while widening the cabin interior space as much as possible.
[0006]
[Means for Solving the Problems]
[Configuration, operation and effect of the invention according to claim 1]
[0007]
(Configuration) cabin air-conditioning structure for agricultural tractor of the invention according to claim 1, in the downlink ceiling, placing the air conditioning case that speculating the partition, the air-conditioned cases, a long left front in the lateral direction in a straight line A partition wall and a right front partition wall that is linearly long in the left-right direction, the width of the left end of the left front partition wall and the right end of the right front partition wall is wider than the evaporator, A left and right front air conditioning duct comprising the evaporator on the rear side of the right front partition wall, the left and right front partition walls, and a front wall formed on the front side facing the left and right front partition walls. The heater is arranged between the right end of the left front partition wall and the left end of the right front partition wall in a state of projecting into the front air conditioning duct on the front side of the left and right front partition walls, The left side of the heater On the lower surface of the front air conditioning duct between the left front partition wall and the front wall, in an open state close to the left front partition wall and the front wall and located next to the left end of the heater And forming a left front air outlet, on the lower surface of the front air-conditioning duct between the right front partition wall and the front wall on the right side of the heater, on the right front partition wall and the front wall. A right front air outlet is formed in an adjacent open state and located next to the right end of the heater, and air from the left and right front air outlets is provided on the left and right sides of the handle post of the driving control unit. The left side opening of the left front bulkhead portion formed on the left front bulkhead portion is opened and closed on the left side end portion of the left front bulkhead portion located on the front side of the left end of the evaporator. A damper is provided and located on the front side of the right end of the evaporator. A right damper that opens and closes a ventilation opening formed in the right front partition is provided at the right end of the right front partition, and the conditioned air from the evaporator is supplied to the left and right through the left and right openings. There in that are configured to be supplied before air outlet, effects thereof are as follows.
[0008]
(Effect) The improvement point from the conventional structure is that the front outlets are arranged to the left and right, so that an empty space is created in the left and right intermediate part, and the heater is moved to the part that becomes the empty space.
Therefore, the rear end of the descending ceiling portion can be moved forward by the amount that the heater and the evaporator have moved forward.
As a result, the space between the rear surface of the descending ceiling and the driver's cockpit is increased, and the driver's head space can be widened without inviting the entire cabin to be expanded, thereby ensuring a comfortable driving space. did it.
[0009]
An air conditioning structure for a cabin of an agricultural tractor according to a second aspect of the invention includes an inner roof portion and an outroof portion constituting the roof portion, and an air flow for sending air for air conditioning from the rear side of the roof portion to the air conditioner case. A fan for blowing air that forms a passage, connects the front end of the air flow passage to the air conditioner case, and causes air conditioning air introduced through the air flow passage to act on the evaporator in the air conditioner case the Ru near the point that is provided.
A cabin air conditioning structure for agricultural tractors according to a third aspect of the present invention has a connection portion with a refrigerant circulation circuit at one side end of the evaporator and the other end side not having the connection portion of the evaporator. a state close to, certain fan for blowing the action of the air-conditioning air to the evaporator to a point which had been placed.
[0010]
(Configuration) cabin air-conditioning structure for agricultural tractor of the invention according to claim 4, the roof portion, constituted by the inner roof portion located inside the outer roof portion located outside of the inner roof section, A lateral air outlet that discharges conditioned air into the cabin is provided at a lateral side of the roof portion, and a lateral air conditioning duct that guides the conditioned air to the lateral air outlet is formed by the inner roof portion and the outroof portion. It is in the point which is inserted in the side part of the said roof part , and the effect is as follows.
[0011]
(Operational effect) By fixing the horizontal air-conditioning duct placed between the inner roof part and the outroof part between the inner roof part and the outroof part and fixing them, welding is not required especially. (Even if a dedicated fixing tool is used, a small number of dedicated fixing tools may be used. Even if a fixing means such as welding is used, the number of parts to be used may be small).
[0012]
Cabin air-conditioning structure for agricultural tractor (configuration) according to claim 5 invention, the lateral air-conditioning duct arranged on the left and right of the roof portion, and erection of the connection frame over the left and right lateral air-conditioning duct, wherein The left and right horizontal air conditioning ducts are connected.
[0013]
[0014]
[0015]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1 and 6, a cabin 1 of an agricultural tractor includes a cabin side door 3 having a plurality of cabin columns 2 and a transparent glass surface covering a portion surrounded by the columns 2, and a rear side window. 4 and a rear window 5. The upper frame 6 is provided over the upper surface of each column 2, and the roof portion 7 is placed on the upper frame 6.
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.
[0016]
The structure of the roof part 7 is demonstrated.
As shown in FIGS. 1 to 6, the roof portion 7 includes an outroof portion 13 and an inner roof portion 14, and each is attached to and supported by the upper frame 6. The inner roof portion 14 is an integrally molded product of resin, and the front half portion 17 located above the handle post 10 is formed in a descending ceiling portion bulging downward, and the air conditioning unit A is accommodated in the descending ceiling portion. It is. As shown in FIG. 3, the front half 17 is provided with a front air-conditioning duct 15A for guiding conditioned air from the air-conditioning unit A to the left and right lateral ends, and from the left and right sides of the front half 17 at substantially the same overhead height. Side storage portions 16 and 16 as lateral side portions for the lateral air conditioning duct 15B extend toward the rear. The intermediate part 18 surrounded by the front half part 17 and the both side storage parts 16 , 16 is located above the control seat 12, and has a higher overhead height than the front half part 17 and the both side storage parts 16, 16. It is formed.
[0017]
As shown in FIGS. 5 and 6, the outroof portion 13 is placed on the upper surface of the upper frame 6 and has a flat plate shape wider than the placement surface. A seal ring 19 having a rectangular cross section formed in a ring shape is attached to the downward surface of the outroof portion 13, and the cross section of the seal ring 19 is set in a state where the outroof portion 13 is placed on the upper frame 6. The portion comes into contact with the upper surface of the upper frame 6 to block the air flow from the outside. An outside air inlet 13B is attached to the downward surface of the rearward flange 13A protruding rearward from the upper frame 6 of the outroof portion 13, and communicates with the outside air inlet 13B at a portion located inside the seal ring 19. An outside air outlet 13C is formed.
The outside air taken in from the outside air inlet 13B is introduced into the air conditioning unit A from the outside air outlet 13C.
[0018]
The internal structure of the inner roof part 14 will be described. As shown in FIGS. 1 to 6, the air conditioning unit A includes an evaporator 20 positioned above the handle post 10 in a front half portion 17 having a low overhead height in the inner roof portion 14, and a heater 21 positioned in front of the evaporator 20. evaporator 20, compressors, not shown, an expansion valve, and constitutes a refrigerant circuit in cooperation with a condenser and the like. 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 outlet 13 </ b> C toward the evaporator 20 and the heater 21.
[0019]
As shown in FIG. 6, the outside air discharged from the outside air outlet 13 </ b> C has a space 24 formed between the downward surface of the outroof portion 13 and the upward surface of the inner roof portion 14 as an air flow passage. The suction is guided to the suction port 23A of the sirocco fan 23 surrounded by.
As shown in FIGS. 2 and 3, front air outlets 25, 25 for blowing air after air conditioning into the cabin 1 are provided on the left and right sides of the heater 21, and the handle post 10 having the steering handle 11 is provided. Air is blown out to the left and right sides.
[0020]
As shown in FIGS. 2 and 3, the evaporator 20 and the sirocco fan 23 are surrounded by a partition wall 24, and the partition wall 24 is connected to the left and right ends of the rear surface of the heater 21. The partition wall 24 includes a left front partition wall portion 24A that is linearly long in the left-right direction and a right front partition wall portion 24B that is linearly long in the left-right direction. Left and right front partition wall portion 24A, 24B and left and right front partition wall portion 24A, Yes to form a pre-air-conditioning duct 15A in the wall 40 before being formed on the front side facing the 24B, on the both sides of the heater 21 An opening to the front air conditioning duct 15A is formed, and left and right first dampers 26A and 26B are provided in the left and right openings, respectively. In order to introduce the conditioned air to the front intake portions 15b of the left and right horizontal air conditioning ducts 15B and 15B to the delivery portions 15a at both lateral ends of the front air conditioning duct 15A in the vicinity of these two first dampers 26A and 26B, The left and right second dampers 26C and 26D are provided, respectively.
[0021]
As shown in FIG. 2, the first dampers 26A and 26B are linked to a first drive arm 27A provided at an intermediate position of the machine width via left and right first linkage rods 28A and 28B, and are configured to open and close simultaneously. It is. As shown in FIG. 3, these dampers 26 </ b> A and 26 < / b> B can be adjusted in the degree of opening and closing, and the conditioned air blown from the sirocco fan 23 exchanges heat with the evaporator 20 and then exchanges heat with the heater 21. It is fed into the front air conditioning duct 15A and reaches the left and right front air outlets 25, 25 formed near the left and right ends of the front air conditioning duct 15A.
Since the front outlets 25 and 25 are arranged near the left and right end portions, the conditioned air can be applied over a wide range of the front window surface of the cabin 1, so that the anti-fogging effect on the front window surface can be enhanced. it can.
[0022]
On the other hand, when the first dampers 26A and 26B are kept closed, the entire amount of the conditioned air from the sirocco fan 23 is sent out with heat exchange with the heater 21, but the degree of opening of the first dampers 26A and 26B. Accordingly, it is possible to create conditioned air that reaches the front outlets 25 and 25 directly without exchanging heat with the heater 21. As a result, the conditioned air that has been heat exchanged with the heater 21 and the conditioned air that has not been heat-exchanged can be mixed and sent to the front outlet 25, and extreme cold air is not sent.
[0023]
As shown in FIG. 2, the second dampers 26C and 26D are linked to the second drive arm 27B provided adjacent to the first drive arm 27A via the left and right second linkage rods 28C and 28D, and are simultaneously opened and closed. It is comprised so that. These second dampers 26C and 26D are merely switched to the two positions of opening and closing, and the conditioned air blown from the sirocco fan 23 and the conditioned air that has passed through the heater 21 are introduced into the lateral air conditioning ducts 15B and 15B. It has a function to adjust whether or not to do.
[0024]
As shown in FIG. 2, the left and right lateral air-conditioning ducts 15B and 15B and the left and right side storage parts 16 and 16 for storing the air-conditioning ducts 15B and 15B are respectively provided with downward air outlets 16A and 16A on the front side. A pair of front and rear oblique air outlets 16B and 16B are formed on the rear side of the downward air outlets 16A and 16A, respectively, and the face of the pilot is blown out from the oblique air outlets 16B and 16B. These downward air outlet 16A and the diagonal air outlet 16B are referred to as horizontal air outlets.
[0025]
As shown in FIGS. 2 to 4, on / off switching of the air volume adjusting on / off switch 29 </ b> A and the second dampers 26 </ b> C and 26 </ b> D to the sirocco fan 23 is performed on the inward surface 17 </ b> A of the falling wall of the front half 17 of the inner roof portion 14. The second damper switch 29C to be performed and the first damper switch 29B to the first dampers 26A and 26B are provided adjacent to each other, and the operation from the driver's cockpit 12 is facilitated.
[0026]
As shown in FIGS. 4 to 6, an outside air intake damper 33 is provided at the circulation port 14 </ b> A provided on the rear end side of the inner roof portion 14. Through the outside air inlet 13B, and a state in which taking in a space a formed between the inner roof section 14 and the outer roof section 13, a state in which circulating cabin air blocking external air between said space a It is constituted as follows.
[0027]
As shown in FIGS. 7 , 8 and 9, the outside air intake damper 33 includes a swing shaft 33 </ b> A provided on the rear side of the outside air inlet 13 </ b> B in the inner roof portion 14 in a state extending from side to side and the swing shaft 33 </ b> A. A mounting plate 33B attached to the moving shaft 33A and a shielding rubber 33C bonded and fixed to the mounting plate 33B are assembled.
[0028]
As shown in FIGS. 7 and 9, the toothed plate 33E extends from the left and right boss portions 33D integrally formed at both ends of the swing shaft 33A, and the fixed boss 34 is opposed to the toothed plate 33E. It is arranged. The fixed boss 34 accommodates a ball 34a that engages with a tooth portion of the toothed plate 33E and a spring 34b that protrudes and biases the ball 34a. The detent mechanism includes the toothed plate 33E, the ball 34a, and the spring 34b. B is configured.
An operation arm 33F extends downward on the toothed plate 33E so that the opening degree of the outside air intake damper 33 can be adjusted.
[0029]
That is, as shown in FIG. 8B, if the shielding rubber 33C is in contact with and shielded from the outside air outlet 13C on the outroof portion 13, the outside air is blocked. In this state, since the circulation opening 14A formed in the inner roof 14 is opened, the space a of the air in the cabin 1 and an inner roof section 14 and the outer roof portion 13 through the circulation opening 14A It is introduced into the cabin, receives air conditioning, and is blown again into the cabin 1 from each outlet.
As shown in FIG. 8 (a), if the shielding rubber 33C is separated from the outside air outlet 13C to close the opening 14A, only outside air can be taken in. In this state, the outside air is subjected to air-conditioning effect is introduced into the space a between the inner roof section 14 and the outer roof portion 13 through the outside air outlet 13C, blown again into the cabin 1 from the outlets.
If the shielding rubber 33C is set at a position separated from both the outside air outlet 13C and the circulation opening 14A, the air from the cabin 1 and the outside air can be mixed and air-conditioned, and the room temperature in the cabin 1 can be adjusted. It can be done easily and finely.
[0030]
The connection structure of the air conditioning duct 15 will be described.
As shown in FIGS. 3 and 10, an air conditioner case 30 of an air conditioning unit A is provided on the front side of the machine body to exchange heat with the heater 21 and guides the discharged air conditioned air to the left and right sides. An air conditioning duct 15A is arranged. The air-conditioned air sending part 15a of the pre-air conditioning duct 15A is formed in a rectangular tube shape.
[0031]
Similarly, the upper surface of the front intake portion 15b of the horizontal air-conditioning duct 15B formed in a rectangular tube shape is partially formed in the cutout portion 15c. By forming the cutout portion 15c, the horizontal air conditioning duct 15B is lifted from the bottom upward through the cutout portion 15c, so that the delivery portion of the front air conditioning duct 15A is inserted into the front intake portion 15b of the horizontal air conditioning duct 15B. The portion 15a is fitted inside. In this fitted state, the cover body 31 is covered and fitted so that the side wall of the front air-conditioning duct 15A is tightened from the outside so as to be covered with the cover body 31 having the same shape as the cutout portion 15a. Rivet fixed to the upper surface of the air conditioning duct 15B. As described above, the horizontal air conditioning duct 15B can be mounted in a plug-in manner, but can be fitted by moving up and down, so that a fitting structure with less air leakage can be secured.
[0032]
As shown in FIGS. 2 and 5, the left and right horizontal air-conditioning ducts 15B and 15B are provided with connecting frames 32 that connect the upper surfaces to each other to provide positioning and reinforcing effects for the left and right horizontal air-conditioning ducts 15B and 15B. ing. The left and right horizontal air conditioning ducts 15B and 15B are fixed by being sandwiched from above and below by the side storage portion 16 and the outroof portion 13 of the inner roof portion 14. Although not shown in FIG. 5, but between the downward surface and the lateral air-conditioning duct 15B of the outer roof portion 13 by interposing a heat insulating material covering the air-conditioning duct, so as to fill the gap. Since these air conditioning ducts 15A and 15B are made of resin and cannot be welded or the like, the sandwiching structure from above and below is effective, and the left and right horizontal air conditioning ducts 15B and 15B are connected by the connecting frame 32. Even if it is a pinching fastening structure, it can be sufficiently fixed.
[0033]
[Brief description of the drawings]
[1] overall side view of a tractor 2 shows the inner roof portion cross-sectional plan showing the inner surface as viewed from the outer roof side view [FIG 3] FIG partially enlarged cross-plane in FIG. 2 FIG. 4 of the inner roof section Bottom view showing the ceiling surface as seen from inside the cabin [Fig. 5] Rear view showing the switches provided on the descending ceiling [Fig. 6] Vertical side view of the inner roof [Fig. 7] Shows a damper for taking in outside air Plan view [Fig. 8] A vertical side view showing a state in which the circulation opening is closed with a damper for taking in outside air and a state in which the outside air outlet is closed. [Fig. 9] A partially cutaway view showing a damper for taking in outside air. Side view [Fig. 10] Perspective view showing the connection structure between the front air-conditioning duct and the rear air-conditioning duct [Explanation of symbols]
1 key Yabin <br/> 7 Le-safe unit
8 Driving control section
10 handle post 13 A Utorufu portion 14 b N'narufu portion 15A before air-conditioning duct 15B lateral air-conditioning duct 16 transverse sides 16A, 16B Yokobuki outlet 17 front half 20 evaporator 21 heater
23 Sirocco fans (fans)
24 Bulkhead
24A Left front bulkhead
24B Right front bulkhead 25 Front outlet
26A 1st damper (left damper)
26B 1st damper (right damper)
30 Air conditioner case
32 Connecting frame
40 Front wall A Air conditioning unit

Claims (5)

Forming the downstream roof portion that bulges downwards first half of the roof portion provided with a driving maneuver portion, cabin air-conditioning structure for agricultural tractors is provided an air conditioning unit having a heater and the evaporator in the downlink ceiling Because
An air conditioner case with a partition wall is disposed on the descending ceiling ,
The air conditioning cases, a longer, left front partition wall in a straight line in the lateral direction, and a long right front partition wall portion in a straight line in the left-right direction, the left end and the right end of the right front partition wall portion of the left front partition wall portion The width is configured wider than the evaporator, and the evaporator is disposed on the rear side of the left and right front partition walls ,
The left and right front partition walls and the front wall formed on the front side facing the left and right front partition walls constitute a left and right front air conditioning duct,
The heater is disposed between the right end of the left front partition wall and the left end of the right front partition wall in a state of protruding into the front air conditioning duct on the left side and the front side of the right front partition wall,
On the left side of the heater, on the lower surface of the front air conditioning duct between the left front partition and the front wall, in an open state close to the left front partition and the front wall, the left end of the heater The right front partition is formed on the lower surface of the front air-conditioning duct between the right front partition and the front wall on the right side of the heater. A right front air outlet is formed in an open state adjacent to the front wall and the right end of the heater, and air from the left and right front air outlets is Constructed to blow out to the left and right sides of the steering wheel handle,
A left damper that opens and closes a left opening for ventilation formed in the left front partition is provided at the left end of the left front partition located on the front side of the left end of the evaporator, and the right end of the evaporator A right damper that opens and closes the ventilation opening formed in the right front partition wall is provided at the right end of the right front partition wall located on the front side of the right front partition wall so that the conditioned air from the evaporator is opened to the left and right openings. An air conditioning structure for a cabin of an agricultural tractor that is configured to be supplied to the left and right front outlets via a door . The inner roof portion and the outroof portion constituting the roof portion form an air flow passage for sending air for air conditioning from the rear side of the roof portion to the air conditioner case, and the front end portion of the air flow passage is connected to the air conditioner. 2. The air conditioning structure for a cabin of an agricultural tractor according to claim 1, wherein a fan for blowing air that is connected to a case and causes air conditioning air introduced through the air flow passage to act on the evaporator is provided in the air conditioning case. . A blower for forming air-conditioning air on the evaporator in a state in which a connection portion with a refrigerant circuit is formed at one end of the evaporator and in the state of being close to the other end of the evaporator not having the connection portion The air conditioning structure for a cabin of an agricultural tractor according to claim 1 or 2 , wherein a fan for use is arranged. Said roof portion, constituted by the inner roof portion located inside the outer roof portion located outside of the inner roof section, Yokobuki outlet for discharging conditioned already air lateral side of the roof portion to the cabin provided with a lateral air-conditioning duct for guiding the conditioned pre air to the Yokobuki outlet, the claim are placed next to the side of the roof portion is sandwiched between the inner roof and the outer roof section 1-3 An air conditioning structure for a cabin of an agricultural tractor according to any one of the above. 5. The agricultural tractor cabin according to claim 4 , wherein the horizontal air-conditioning ducts are disposed on the left and right sides of the roof portion, and a connecting frame is installed over the left and right horizontal air-conditioning ducts to connect the left and right horizontal air-conditioning ducts. Air conditioning structure.

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