JPH11334352A - Gab equipped with air conditioner for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a space above the head of an operator for getting in/out of a cab box at the side of its ceiling even if an air conditioner is mounted to the ceiling side. SOLUTION: The air conditioning unit 34 of an air conditioner 33 is disposed so as to be one-sided to the rear part side of the ceiling part 15 of a cab box 14 using a housing cover 28, and an operator's seat 12 is provided for a space under the air conditioner 33. And an overhead space 32 is provided between the air conditioner 33 and a front part 16. A ceiling window 21 is provided at the ceiling part 15 above the overhead space 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab for a construction machine provided on a construction machine such as a hydraulic shovel and provided with an air conditioner for cooling and heating the inside of a cab box.

[0002]

2. Description of the Related Art Generally, a cab for a construction machine provided on a hydraulic excavator or the like includes a cab box having a ceiling, a front, a rear, and left and right side portions, and at least an evaporator and a blower fan. An air conditioner that blows conditioned air from the outlet into the cab box.

In a cab of this type according to the prior art, an operator operates an air conditioner appropriately in accordance with the temperature in the cab box, so that cool air or hot air is blown from the air outlet of the air conditioner into the cab box. The inside of the cab box is always maintained at an appropriate temperature.

Further, for example, in another prior art described in Japanese Patent Application Laid-Open No. 2-95921, it is known that an air conditioner is provided at a position in front of a driver's seat on the ceiling side.

[0005]

In the cab of the above-mentioned conventional hydraulic excavator, when the air conditioner is arranged on the lower side (floor side) of the cab box, the air on the lower side of the cab box is supplied from the engine or the like. The air is directly sucked into the air conditioner while being heated by the heat of the air conditioner, and the cooling efficiency of the air conditioner may decrease.

Therefore, if the air conditioner is arranged on the ceiling side of the cab box, there is no possibility that the warmed air is directly sucked into the air conditioner as described above, and the cooling efficiency of the air conditioner can be improved. It is.

However, in this case, it is necessary to secure a space for the air conditioner on the ceiling side, so that the overhead space on the ceiling side is narrowed by this space, for example, the operator gets on and off the cab box. At times, there is a problem that the air conditioner on the ceiling side obstructs the air conditioner from getting on and off.

In another prior art, since the air conditioner is provided on the ceiling in front of the driver's seat, the head of the operator can easily hit the air conditioner side when getting on and off the cab box. There is also a problem that the air conditioner becomes an obstacle when getting on and off.

In order to solve such a problem, a method of increasing the height (total height) of the cab box to increase the height of the ceiling portion to secure an overhead space is considered. .

However, in a construction machine for excavating earth and sand at a position above a ceiling, such as a small-turn hydraulic excavator, when the overall height of the cab box is increased as described above, the bucket of the working device is not used. There is a risk that the tip or the like may collide with the ceiling, and the burden on the operator during excavation work or the like increases, making it difficult to improve workability.

The present invention has been made in view of the above-mentioned problems of the prior art. Even if an air conditioner is provided on the ceiling side, the present invention does not increase the height of the ceiling side. A cab for a construction machine equipped with an air conditioner capable of securing a sufficient overhead space in the cab box, easily entering and exiting the cab box, and improving the livability and operability. It is intended to provide.

[0012]

In order to solve the above-mentioned problems, a cab for a construction machine equipped with an air conditioner according to the present invention comprises a cab having a ceiling, a front, a rear and left and right side portions. It has a box and an air conditioner which comprises at least an evaporator and a blower fan and blows conditioned air from the outlet into the cab box.

A feature of the structure adopted in the first aspect of the present invention is that an air conditioner is provided on the ceiling side of the cab box at the rear side of the ceiling, and the air conditioner is provided on the front side of the air conditioner. An overhead space is provided between the front side of the cab box and the ceiling side.

[0014] With this configuration, an overhead space is secured between the ceiling and the operator's head in front of the air conditioner. The head or the like can be prevented from hitting the air conditioner or the like, and the operator can take a free posture in the cab box.

According to the second aspect of the present invention, a driver's seat is provided in the cab box at a position below the air conditioner,
The overhead space is disposed at a position forward of the driver's seat.

With this configuration, when the operator stands up from the driver's seat, an overhead space can be secured between the operator and the ceiling, and the operator's head or the like is prevented from hitting the air conditioner. can do.

According to the third aspect of the present invention, a ceiling window is provided on the ceiling portion of the cab box above the overhead space.

With this configuration, the operator can easily secure the upward view from inside the cab box by the skylight.

Further, according to the invention of claim 4, an accommodation cover for accommodating an air conditioner is provided between the cab box and the ceiling, and the accommodation cover is provided behind the cab box. A lower cover portion that extends substantially horizontally from the surface portion to a middle position in the front-rear direction and covers the air conditioner from below, and extends upward from the front end side of the lower cover portion toward the ceiling portion, and has an upper end portion. And a front cover fixed to the ceiling.

[0020] With this configuration, in a state where the air conditioner is housed between the ceiling portion of the cab box and the housing cover, an overhead space is provided between the front cover portion of the housing cover and the front portion of the cab box. Can be provided.

Further, in the invention according to claim 5, the air outlet of the air conditioner is opened toward the front surface of the front cover of the housing cover.

With this configuration, conditioned air can be blown from the air outlet of the air conditioner provided at the front cover portion of the housing cover toward the front portion of the cab box, and the temperature inside the cab box can be easily adjusted. It can be carried out.

On the other hand, in the invention of claim 6, the air outlet of the air conditioner is provided with a blowing direction adjusting means for variably adjusting the direction of the conditioned air blown into the cab box.

[0024] With this configuration, the blowing direction of the conditioned air blown from the air outlet of the air conditioner can be adjusted by operating the blowing direction adjusting means according to the operator's preference.

[0025]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a cab for construction equipment provided with an air conditioner according to an embodiment of the present invention; FIG. I do.

In the drawing, reference numeral 1 denotes a lower traveling body, 2 denotes an upper revolving body mounted on the lower traveling body 1 so as to be pivotable, and the upper revolving body 2 comprises a revolving frame 3 and a left front of the revolving frame 3. A cab 4 for a hydraulic shovel provided on the side
And an engine (not shown) disposed on the revolving frame 3 at the rear side, and a counterweight 5 provided at the rear of the revolving frame 3.

A working device 6 for excavating earth and sand is provided on the revolving frame 3 so as to be able to move up and down. The working device 6 includes a lower boom 7, an upper boom 8, an arm 9, a bucket 10, and the like. I have. Further, the cab 4 includes a cab box 14 and an air conditioner 33 described below.

Reference numeral 11 denotes a floor plate provided on the revolving frame 3 of the upper revolving unit 2. The floor plate 11 includes a driver's seat 12 on which an operator sits and a working device 6 and the like, as shown in FIGS. An operation lever device 13 including an operation lever 13A or the like for operation is provided. Here, the driver's seat 12 is disposed below the air conditioning unit 34 at a position near the rear of the floor panel 11.

Numeral 14 denotes a cab box provided on the upper side of the floor panel 11, and the cab box 14 has a ceiling portion 15, a front portion 16, a rear portion 17, and left and right side portions 18, 19.
A door 20 is attached to the left side surface 18.

Numeral 21 denotes a skylight provided on the ceiling portion 15 of the cab box 14. The skylight 21 is arranged at a position above an overhead space 32 which will be described later, as shown in FIGS.
This secures an upward view from inside the cab box 14.

Reference numeral 22 denotes an upper front window provided on the upper side of the front portion 16 of the cab box 14. The front window 22 has a window frame 22A and an inner side of the window frame 22A as shown in FIGS. It is constituted by the attached glass plate 22B. Further, four rollers 23 are rotatably provided at four corners of the window frame 22A of the front window 22, and these rollers 23 are rotatably engaged with guide rails 27 described later. I have.

Reference numeral 24 denotes a lower front window provided at a lower portion of the front portion 16 of the cab box 14. The front window 24 is provided on the front portion 16 below the front window 22 as shown in FIGS. Fixed.

Numeral 25 denotes a left-side reinforcing frame provided on the ceiling 15 side of the cab box 14 and between the side portion 18 and the reinforcing frame 25, as shown in FIGS. From the right.

As shown in FIG. 8, the reinforcing frame 25 is formed in a substantially triangular shape and extends in the front-rear direction.
And an extended plate portion 25B whose upper end is integrated with the ceiling portion 15 by bending upward and extending from the protruding end of the overhang plate portion 25A.
(Note that the reinforcement frame 25 is shown on the right side in FIGS. 6 and 7). The reinforcing frame 25 is configured to increase the rigidity of the cab box 14 on the ceiling 15 side together with a reinforcing frame 26 described later.

Reference numeral 26 denotes a right-side reinforcing frame which is provided on the ceiling portion 15 side of the cab box 14 and provided between the cab box 14 and the side portion 19. The reinforcing frame 26 is a reinforcing frame 25 as shown in FIGS. And protrudes leftward from the side surface portion 19.

As shown in FIG. 8, the reinforcing frame 26 has an overhanging plate portion 26A elongated in the front-rear direction, and is bent substantially in an L shape from the protruding end of the overhanging plate portion 26A. An extension plate portion 26B extends obliquely upward and has an upper end integrated with the ceiling portion 15 (the reinforcement frame 26 is shown on the left side in FIGS. 6 and 7). Further, a through-hole 26A1 is formed in the overhanging plate portion 26A of the reinforcing frame 26 at a position corresponding to a blower duct 44 described later.

Here, the reinforcing frames 25 and 26 are located on the ceiling 15 side of the cab box 14 as shown in FIG.
It is arranged left and right apart. And the reinforcement frame 25
The extension plate portion 25B extends in the front-rear direction together with the extension plate portion 25B of the reinforcing frame 25, and the front window 22 is accommodated between the two as shown in FIG. .

Reference numerals 27, 27 denote left and right guide rails provided on the reinforcing frames 25, 26 and the like of the cab box 14, and the respective guide rails 27 have left and right side portions 18, 1 on the front side.
9 extends vertically along the front end, and the upper side is a reinforcing frame 2
It extends in the front-back direction along 5,26.

The left guide rail 27 of the guide rails 27 extends along the front rail 27A extending vertically along the front end of the side surface 18 and the extension plate 25B of the reinforcing frame 25. The whole is bent as a substantially L-shape by a ceiling-side rail portion 27B extending in the front-rear direction to form a rail having a substantially U-shaped cross section.

The right guide rail 27 also has a front rail portion 27A provided along the front end of the side surface portion 19 and a ceiling rail portion provided along the extension plate portion 26B of the reinforcing frame 26. 27B and the guide rail 27 on the left.

Each of the guide rails 27 is connected to each of the rollers 23 by a front rail 27A as shown by a dashed line in FIG.
From the ceiling along the rail 27B on the ceiling side. As a result, the front window 22 slides upward from the closed position shown in FIG. 3 and is stored on the ceiling 15 side at the open position shown by the solid line in FIGS.

Reference numeral 28 denotes a housing cover for housing the air conditioning unit 34 of the air conditioner 33 on the ceiling 15 side of the cab box 14.
The lower cover portion 28 extends substantially horizontally from the rear surface portion 17 to an intermediate position in the front-rear direction and covers the air conditioning unit 34 from below.
A, and a front cover portion 28B, which is bent in a substantially rectangular shape from the front end side of the lower cover portion 28A to the ceiling portion 15 and extends obliquely upward, and the upper end side is fixed to the ceiling portion 15. I have.

The front cover portion 28 of the housing cover 28
As shown in FIG. 5, a substantially rectangular opening 28C (only one is shown) is provided in B at a distance to the left and right, and this opening 28C is provided with an outlet 38A of an air discharge box 38 described later.
Is opened in the cab box 14.

The housing cover 28 is located on the left,
As shown in FIG. 7, both right ends are fixed to the extension plates 25B and 26B of the reinforcing frames 25 and 26, and these extension plates 25
B, 26B and the ceiling 15 between the air conditioning unit 34
Is defined in a unit accommodation room 29 for accommodating therein.

The lower cover portion 28 of the housing cover 28
A are opened at A. Each of the inside air inlets 30 is for introducing the air in the cab box 14 to the air conditioning unit 34 side. Further, a dustproof filter 31 is attached to each of the inside air inlets 30 as shown in FIG.

Reference numeral 32 denotes an overhead space located in front of the air conditioner 33 and provided on the ceiling portion 15 side of the cab box 14. The overhead space 32 is, as shown in FIGS. ), The front portion 16, the extension plate portions 25B and 26B of the reinforcing frames 25 and 26, and the front cover portion 28B of the housing cover 28.

The overhead space 32 is provided at a position on the front side of the driver's seat 12, and when the operator stands up in front of the driver's seat 12, the head of the operator becomes the air conditioner 3.
It is configured to prevent collision with the third side.

Reference numeral 33 denotes an air conditioner for blowing cold or warm air as conditioned air into the cab box 14. The air conditioner 33 includes an air conditioning unit 34, an air discharge box 38, and left and right air ducts. 40, 44 and the like.

Reference numeral 34 denotes an air conditioning unit provided on the side of the ceiling 15 of the cab box 14, and the air conditioning unit 34
It comprises an evaporator 35, a heater core 36 and a blower fan 37.

Here, the air conditioning unit 34 is
Is housed in the unit housing chamber 29 at a position on the rear side. Further, the evaporator 35 of the air conditioning unit 34 evaporates the refrigerant supplied through an expansion valve 53 described later to cool the air around the evaporator 35. Further, the heater core 36 warms the air around the heater core 36 by circulating a portion of warm water from a radiator 55 described later through a warm water valve (not shown) or the like.

The air-conditioning unit 34 selectively operates one of the hot water valve and the compressor 49 to generate the hot or cold air or the blower fan 37.
To blow air toward the wind discharge box 38.

Numeral 38 designates an air discharge box provided in the unit accommodating chamber 29 in front of the air conditioning unit 34. The air discharge box 38 is provided on the left and right sides as shown in FIGS.
It is formed as a horizontally elongated box-like body extending rightward.

Here, the air discharge box 38 is provided with air outlets 38A, 38A at the front side thereof, which are separated to the left and right, and each of the air outlets 38A is provided with an opening 28C of the housing cover 28.
Through the front cover portion 28B toward the front surface portion 16 of the cab box 14. A unit connection port 38B is provided on the rear surface side of the air discharge box 38, and the unit connection port 38B is connected to the inside of the air conditioning unit 34.

Further, on both the left and right sides of the air discharge box 38, duct connection ports 38 for air blow ducts 40 and 44 described later are provided.
C and 38D are protrudingly provided. And the wind exhaust box 3
8 blows cold air (warm air) from the air conditioning unit 34 from each outlet 38A toward the inside of the cab box 14, and also sends a part of the cold air (warm air) to the air blowing ducts 40 and 44.
Is to be blown toward.

Reference numerals 39 and 39 denote left and right louvers as blowing direction adjusting means provided at each of the air outlets 38A of the air discharge box 38. The louvers 39 correspond to the opening 2 of the housing cover 28.
8C, a substantially rectangular fixed frame 39A attached to the air outlet 38A of the air discharge box 38 and the fixed frame 39A.
A, a substantially rectangular rotating frame 39B provided rotatably in the vertical direction (vertical direction) in A, and the rotating frame 39B rotatable in left and right directions (horizontal direction). And a plurality of fins 39C, 39C,... Provided.

The louver 39 is connected to the rotating frame 39B.
Is rotated with respect to the fixed frame 39A, or each fin 39C
Is rotated with respect to the rotation frame 39B to adjust the amount and direction of the cool air (warm air) blown out from the outlet 38A of the wind discharge box 38.

Reference numeral 40 denotes a left air duct located on the ceiling portion 15 side of the cab box 14 and opened to the reinforcing frame 25.
The blower duct 40 has a base end connected to the duct connection port 38C of the air discharge box 38, and a distal end bent and extended downward through the extension plate portion 25B of the reinforcing frame 25. And a second duct 42 whose base end is connected to the distal end of the duct 41 and whose distal end is an outlet 42A and opens downward from the overhang plate 25A.

Here, the outlet 42A of the blow duct 40
Is a position where the front window 22 is not shielded by the front window 22 even when the front window 22 is in the open position as shown in FIG.
That is, it opens into the cab box 14 at a position below the front window 22. And, the outlet 4 of the air duct 40
2A is provided with a louver 43 having substantially the same configuration as the louver 39 on the wind discharge box 38 side.
Is configured to adjust the amount and direction of the cool air (warm air) blown from the outlet 42A.

Reference numeral 44 denotes a right air duct located on the ceiling portion 15 side of the cab box 14 and opened to the reinforcing frame 26.
The blower duct 44 has a first end connected to a duct connection port 38D of the air discharge box 38 at a base end and a first end 45 extending at a leading end through the extension plate portion 26B of the reinforcing frame 26; A second duct 46 connected to the distal end side and attached to the overhang plate portion 26A at a position corresponding to the through hole 26A1 of the reinforcing frame 26 at the base end side, and through the through hole 26A1 of the reinforcing frame 26 at the base end side. The third duct 47 is attached to the overhang plate portion 26A so as to communicate with the opening 46, and has a blowout opening 47A at the tip end and opens in the lateral direction (leftward in the left and right width directions).

Here, the outlet 47A of the air duct 44
As shown in FIGS. 4 and 7, even when the front window 22 is in the open position, the air duct is not shielded by the front window 22, that is, at a position below the front window 22. 44
And the inside of the cab box 14 together with the air outlet 47A.

The outlet 47 of the air duct 44
A is provided with a louver 48, and the louver 48 is configured to adjust the blowing amount and blowing direction of the cool air (warm air) blown out from the blowout port 47A.

Reference numeral 49 denotes the air conditioning unit 3 as shown in FIG.
4, a compressor provided on the engine side of the upper-part turning body 2 and located downstream of the evaporator 35.
Is connected to an evaporator 35 and a condenser 5 described later by a refrigerant pipe 50.
1, and compresses the refrigerant that has passed through the evaporator 35 and has been vaporized.

A condenser 51 is provided on the downstream side of the compressor 49 and radiates heat of the refrigerant compressed by the compressor 49 to liquefy the refrigerant. A condenser 52 is provided on the downstream side of the condenser 51 and This is a refrigerant tank for temporarily storing the refrigerant liquefied by the vessel 51 and performing gas-liquid separation. An expansion valve 53 is provided downstream of the refrigerant tank 52 and connected to the evaporator 35 by a refrigerant pipe 54. The expansion valve 53 expands the liquefied refrigerant from the refrigerant tank 52, and It is supplied to the evaporator 35 in a state where it is easily vaporized.

The condenser 51, the refrigerant tank 52 and the expansion valve 53 are arranged on the engine side of the upper revolving unit 2 together with the compressor 49, and constitute a part of the air conditioner 33 together with the air conditioning unit 34.

A radiator 55 for the engine of the upper-part turning body 2 is connected to the heater core 36 by hot water pipes 56 and 57. The radiator 55 supplies and discharges part of the cooling water for the engine to the heater core 36 side as hot water. Is what you do.

The small-turn hydraulic excavator according to the present embodiment has the above-described configuration, and is operated by an operator sitting on the driver's seat 12 in the cab box 14 by operating the operation lever 13A. The excavation work is performed by running the vehicle 1 or operating the work device 6.

When the temperature in the cab box 14 rises during work in summer or the like, the hot water valve on the radiator 55 is closed, and the air conditioner 33 is started with the compressor 49 operated. As a result, the cab box 14
The air inside is taken into the air conditioning unit 34 from each inside air inlet 30 by the blower fan 37, and is cooled while passing through the evaporator 35. Then, the cooled air is blown toward the inside of the cab box 14 as cold air from each of the air outlets 38A of the air discharge box 38 and the air outlets 42A and 47A of the left and right air ducts 40 and 44. The inside of the cab box 14 can be maintained at a comfortable temperature.

On the other hand, when the temperature in the cab box 14 decreases during a winter operation or the like, the hot water valve on the radiator 55 side is opened, and the air conditioner 33 is started with the compressor 49 stopped. As a result, cab box 1
The air in 4 passes through the heater core 36 after being taken into the air conditioning unit 34 from the inside air inlet 30 and is heated during this time. Then, the warmed air is supplied to the air exhaust box 38.
38A and left and right air ducts 40.4
4 is blown into the cab box 14 as warm air from the outlets 42A and 47A, and the inside of the cab box 14 can be maintained at a comfortable temperature.

Incidentally, in the small-turn hydraulic excavator, during excavation work, the operator stands in front of the driver's seat 12 as shown by a dashed line in FIG. Is often used to operate the operation lever 13A.

Here, when standing up from the driver's seat 12 as described above, the operator's head moves obliquely upward and forward along a trajectory S indicated by a chain line in FIG.

Therefore, in the present embodiment, the air conditioner 33
Air-conditioning unit 34 of the cab box 14
By disposing the air conditioner 33 from the outside with a housing cover 28 composed of a lower cover portion 28A and a front cover portion 28B, the air conditioner 33 is disposed on the front side of the air conditioner unit 34 so that the front cover portion 28B An overhead space 32 is provided at a position between the front part 16 and the front part 16.

Therefore, even when the operator takes a standing posture in front of the driver's seat 12, it is possible to prevent the head of the operator from hitting the air conditioning unit 34 (the housing cover 28).

Further, since the driver's seat 12 is provided below the air conditioning unit 34, the operator can
3, the operator's head is located below the air conditioning unit 34 at a position lower than the above-described standing posture, as indicated by the solid line in FIG. Thus, even when the driver takes a sitting posture in the driver's seat 12, it is possible to prevent the head of the operator from hitting the air conditioning unit 34 side (the housing cover 28 side).

The driver's seat 12 on which the operator sits
The height H (see FIG. 3) from the seating surface to the lower cover portion 28A of the housing cover 28 can sufficiently satisfy the standard value defined by, for example, the EN standard (European standard).

Thus, in the present embodiment, the operator can take a free posture in the cab box 14 regardless of whether the operator is sitting on the driver's seat 12 or standing up from the driver's seat 12. It is possible to improve the occupancy and the like in the interior and the operability and the like of the operation lever 13A and the like.

Also, when getting on and off the cab box 14, the operator once stands upright in front of the driver's seat 12. Also at this time, the air conditioning unit 34 does not become an obstacle as described above, and the passenger can get on and off the cab box 14 smoothly.

Further, since it is not necessary to make the entire height of the cab box 14 specially high in order to secure an overhead space as in the above-described prior art, the working device 6 can be mounted on the ceiling 1.
5 can be prevented from colliding with the ceiling 15 side of the bucket 10 and the like, the burden on the operator can be reduced, and the operability of the working device 6 can be reduced. Can be increased.

Further, since the skylight 21 is provided above the overhead space 32, the operator can secure an upward view from inside the cab box 14 through the skylight 21 while sitting in the driver's seat 12. Thus, the working posture of the entire working device 6 including the bucket 10 above the ceiling portion 15 can be easily visually checked from inside the cab box 14, and workability and the like can be further improved.

Further, the housing cover 28 is provided on the ceiling 15 side.
Since the unit accommodating chamber 29 is formed by this, the air conditioning unit 34 is accommodated in the unit accommodating chamber 29, so that the air conditioning unit 34 can be easily mounted and laid out.

Further, the left and right air ducts 40 and 44 can be partially accommodated in the unit accommodating room 29 together with the air conditioning unit 34, so that the layout and the like of the air ducts 40 and 44 can be simplified. Can be done.

The front cover portion 28 of the housing cover 28
B is inclined obliquely upward from the tip end of the lower cover 28A, and the upper end of the lower cover 28A is
5, the lower cover 28A
From the cab box 14 to the front cover portion 28B and the ceiling portion 15 can be formed as a smooth continuous surface, and the aesthetic appearance of the ceiling portion 15 can be improved.

Further, the air outlet 38A of the air discharge box 38
From the front cover 28B of the housing cover 28 to the front 16
Cab box 1
In the air outlet 3, air at the side of the overhead space 32 where relatively warm air is more likely to stagnate than at the driver's seat 12 (floor 11) side is blown out.
It can be cooled directly by cold air from 8A, and the temperature of the entire cab box 14 can be easily adjusted.
Work in the cab box 14 can be performed more comfortably.

Further, the left and right air ducts 40, 44
The configuration is such that even when the front window 22 is stored in the window opening position, the window is opened at a position where air can be blown. Therefore, even when the work is performed with the front window 22 opened, the air conditioner 33 is operated. , Air outlets 42A of air ducts 40 and 44,
The conditioned air can be supplied to the operator from 47A, and the work can be performed comfortably.

On the other hand, louvers 39, 43 for adjusting the blowing amount and blowing direction of cold air (hot air) are respectively provided to the air outlet 38A of the air discharge box 38 and the air outlets 42A, 47A of the air ducts 40, 44. Since the configuration is provided, the louvers 39, 43 and 48 can be operated more appropriately by operating the louvers 39, 43 and 48 according to the operator's preference.

Further, since the inside air inlet 30 of the air conditioner 33 is opened to the housing cover 28 on the ceiling 15 side, for example, the inside air inlet is opened to the floor plate 11 side (under the feet of the operator). Shy air inlet 3 compared to
The amount of dust sucked into the zero side can be reduced, and the filter 31 can be prevented from being clogged at an early stage, and its replacement cycle can be extended. In addition, there is no possibility that the air heated by the heat of the engine is sucked into the inside air inlet 30, thereby increasing the cooling efficiency of the air conditioner 33.

Further, since there is no danger of splashing of mud powder and cleaning water for cleaning the floor plate 11 on the side of the inside air inlet 30, maintenance of the entire air conditioner 33 can be easily performed, and air conditioning can be easily performed. The durability and life of the device 33 can be improved.

In the embodiment, the air conditioning unit 34
Although the air conditioner 33 is described as being used as a heating device in addition to the cooling device by providing the heater core 36 to the
By eliminating 6, the air conditioning unit may be used only as a cooling device.

Further, in the embodiment, the description has been given by taking the hydraulic excavator as an example, but the present invention can be widely applied to other construction machines such as a hydraulic crane and a bulldozer.

[0089]

As described above in detail, according to the first aspect of the present invention, the air conditioner is provided at the rear side of the ceiling, so that the air conditioner is located between the front side of the cab box and the front side. The operator's head is air-conditioned even when standing upright in front of the air conditioner, for example, in order to check the front from inside the cab box. It does not hit the device side, it can take a free posture in the cab box, and it is possible to improve the livability, operability, etc. in the cab box. Further, even when getting on and off from the front side of the cab box, the head of the operator does not hit the air conditioner side, and such getting on and off can be performed smoothly.

According to the second aspect of the present invention, a driver's seat is provided in the cab box at a position below the air conditioner,
Since the overhead space is arranged at a position in front of the driver's cab, even when the operator stands in front of the driver's seat,
The head space of the operator can be prevented from hitting the air conditioner side by the overhead space. On the other hand, since the operator sits on the driver's seat below the air conditioner, the head of the operator does not hit the air conditioner side, so that substantially the same effect as the first aspect of the invention can be obtained.

In the invention of claim 3, since the skylight is provided above the overhead space, for example, when working above the ceiling using a working device, the working posture of the working device is changed. From the inside of the cab box, it can be easily visually confirmed through the skylight, and thereby, the workability in the cab box can be improved.

Further, according to the fourth aspect of the present invention, since a housing cover for housing the air conditioner is provided between the cab box and the ceiling, the mounting and layout of the air conditioner are provided. Etc. can be easily performed.

Further, in the fifth aspect of the present invention, since the air outlet of the air conditioner is opened from the front cover portion of the housing cover toward the front portion, the inside of the cab box is compared with the lower portion thereof. The air in the overhead space where hot air tends to stay can be cooled directly by the cool air from the outlet. Thereby, the temperature of the entire cab box can be easily adjusted, and the work in the cab box can be performed more comfortably.

On the other hand, according to the invention of claim 6, since the air outlet direction is provided with the blow direction adjusting means at the air outlet of the air conditioner, the blow direction of the air conditioner is operated by operating the blow direction adjusting means according to the preference of the operator. The blowing direction of the conditioned air blown from the outlet can be appropriately adjusted, so that the work can be performed more comfortably.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view showing the excavator in FIG. 1;

FIG. 3 is an enlarged longitudinal sectional view showing a cab in FIG. 1;

FIG. 4 is a vertical sectional view showing the front window stored in the window opening position and viewed from the same position as in FIG. 3;

FIG. 5 is an enlarged sectional view of a main part showing an air conditioner and an overhead space in FIG. 3;

FIG. 6 is an enlarged left side view showing the cab box in FIG. 1;

FIG. 7 is an enlarged sectional view as seen from the direction of arrows VII-VII in FIG. 4;

FIG. 8 is an enlarged cross-sectional view as viewed from an arrow VIII-VIII in FIG. 3;

FIG. 9 is an enlarged plan view showing the air conditioning unit in FIG. 2 alone.

FIG. 10 is an enlarged front view showing the louver on the wind discharge box side in FIG. 6 alone;

11 is an enlarged cross-sectional view as viewed from the direction indicated by arrows XI-XI in FIG.

FIG. 12 is a circuit diagram of an air conditioner used in the present embodiment.

[Explanation of symbols]

 Reference Signs List 4 cab 12 driver's seat 14 cab box 15 ceiling 16 front 17 rear 18 and 19 side 21 skylight 28 housing cover 28A lower cover 28B front cover 32 overhead space 33 air conditioner 35 evaporator 36 heater core 37 blower fan 38 Air exhaust box 38A, 42A, 47A Air outlet 39, 43, 48 Louver (blowing direction adjusting means)

Claims (6)

[Claims] 1. A cab box comprising a ceiling, a front, a rear, and left and right side portions, and at least an evaporator and a blower fan, and conditioned air is blown into the cab box from an air outlet. In a cab for a construction machine including an air conditioner having an air conditioner, the air conditioner is provided on a ceiling side of the cab box at a rear side of the ceiling, and a front side of the air conditioner is provided. A cab for a construction machine equipped with an air conditioner, characterized in that an overhead space is provided on the side of the ceiling between the cab box and the front surface of the cab box. 2. The cab box, wherein a driver's seat is provided at a position below the air conditioner, and the overhead space is provided at a position before the driver's seat. A cab for a construction machine provided with the air conditioner as described in the above. 3. A cab for a construction machine equipped with the air conditioner according to claim 1, wherein a skylight is provided on a ceiling portion of the cab box above the overhead space. 4. An accommodation cover for accommodating the air conditioner is provided on a ceiling portion side of the cab box between the cab box and the ceiling portion, and the accommodation cover is provided in a front-rear direction from a rear surface portion of the cab box. A lower cover portion that extends substantially horizontally to an intermediate position and covers the air conditioner from below, and extends upward from the front end of the lower cover portion toward the ceiling,
The cab for a construction machine provided with the air conditioner according to claim 1, 2 or 3, wherein the cab comprises an upper end side and a front cover portion fixed to the ceiling portion. 5. A cab for a construction machine equipped with an air conditioner according to claim 4, wherein the front cover of the housing cover has a configuration in which an air outlet of the air conditioner is opened toward a front part. 6. An air outlet of the air conditioner is provided with a blowing direction adjusting means for variably adjusting a direction of conditioned air blown into the cab box.
A cab for a construction machine provided with the air conditioner according to any one of 3, 4, and 5.