JP2001001742A - Air conditioner for work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount an air conditioner compactly mainly in the vertical direction, so that the air conditioner can be preferable to work vehicles such as a low- floor type tractor and the like having a low total height. SOLUTION: This air conditioner is composed of an inboard motor Ab disposed in a driving portion and an outboard motor Aa disposed on a bonnet. The inboard motor Ab has an air-conditioning unit 63 and outside air introduction portion 55. The air conditioning unit 63 having an evaporator 57, heat exchanger for heating 58, air blower 56 and the like is disposed at a front panel 54 inside a cabin 3 covering the driving portion. The outside air introduction portion 55 for the air blower 56 is mounted on an upper portion 5B of the bonnet such that it can open and close freely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a working machine such as a tractor, a backhoe or a combine.
More specifically, the present invention relates to a technology that enables an air conditioner to be compactly equipped while maintaining good maintainability.

[0002]

2. Description of the Related Art As an air conditioner for a working machine, Japanese Utility Model Laid-Open No.
As shown in Japanese Patent Application Laid-Open No. 16903/1994, an air-conditioning unit is installed in a ceiling portion inside a cabin.
As shown in Japanese Patent No. 47832, an air conditioner is known in which an air conditioning unit is arranged above an engine inside a hood at a front portion of a vehicle body.

[0003]

In the former prior art, since the air conditioning unit is arranged right above the operation unit to be air-conditioned, it is possible to efficiently air-condition and reduce the living space in the cabin. In addition to the advantage of being small, the latter technique is preferable in that the air conditioning unit can be arranged close to the power source, and the operation efficiency is excellent, and the mechanical devices can be collectively arranged on the bonnet.

However, in the former prior art,
The cabin height of the air-conditioning unit is higher, so the center of gravity is higher because the heavy air-conditioning unit is at a higher position, and work equipment with relatively strict height restrictions such as low-floor tractors for houses and orchards. And not suitable for small models. Further, in the latter prior art, since most of the air conditioning units are installed in the hood, the height of the hood is higher than usual, which tends to obstruct the front view (especially for a short-swing operator). Case), it is still unsuitable for the above-mentioned work machine with strict height restrictions and small models.

An object of the present invention is to mount an air conditioner compactly mainly in the height direction so as to be suitable for a working machine such as a low-floor type tractor for keeping the overall height low.

[0006]

According to a first aspect of the present invention, in an air conditioner for a working machine, an air conditioning unit having a heat exchanger and a blower is provided on a front panel portion in a cabin that covers an operation section. The outside air introduction part for the air conditioning unit is provided outside the cabin.

A second invention is characterized in that, in the first invention, an outside air introduction portion is provided in a bonnet arranged adjacent to the front of the front panel.

In a third aspect based on the second aspect, the hood comprises a lower portion of the hood fixed to the vehicle body and an upper portion of the bonnet swingably openable and closable with respect to the lower portion of the hood. It is characterized by being provided.

A fourth invention is characterized in that, in the third invention, the outside air suction port in the outside air introduction section is arranged near a pivot for swinging the upper part of the hood up and down.

A fifth invention is the third or fourth invention, wherein:
The outside air suction port and a portion of the outside air introduction section fixed to the lower portion of the hood, or an air conditioning unit are connected and connected by a flexible pipe member.

A sixth invention is characterized in that, in the first to fifth inventions, an inside air introducing portion which opens into the cabin is provided near the blower in the air conditioning unit.

According to the structure of the first aspect, the air conditioning unit including the heat exchanger and the blower is disposed on the front panel portion in the cabin to be air-conditioned, and the outside air introduction portion is disposed outside the cabin. The hood can be made less bulky and more efficient air-conditioning can be performed as compared with the means for installing the air conditioning unit in the hood.
In addition, the height and the center of gravity of the operating unit can be reduced as compared with the case where the air conditioner is mounted on the cabin ceiling. In other words, the air-conditioning unit that should be placed near the air-conditioning target in terms of air-conditioning efficiency is placed inside the cabin, and the outside air introduction unit that has little effect on air-conditioning efficiency is placed outside the cabin, so that a good air-conditioning function can be obtained. The cabin is also configured so that it does not become unnecessarily bulky.

According to the second aspect of the present invention, the outside air introduction portion can be arranged near the air conditioning unit using the internal space of the bonnet, so that the bonnet height does not increase.
In addition, it is possible to effectively use the space in the hood while preventing the outside air introduction portion from protruding from the cabin.

According to the third aspect of the present invention, since the outside air introduction portion is provided on the upper portion of the hood that can swing open and close with respect to the lower portion of the hood, opening the upper portion of the hood allows the outside air introduction portion to be opened. For example, maintenance work such as cleaning and replacement of the air filter becomes easier.

According to the fourth aspect of the present invention, since the outside air suction port of the outside air introduction unit is disposed near the pivotal support on the upper part of the bonnet, the outside air suction unit main body or the fixed side outside air such as the air passage on the air conditioning unit side. The relative movement distance associated with opening and closing the hood between the passage and the outside air inlet can be reduced, and the accuracy of shutting off the outside of the passage when closed can be improved, or the connection length when connecting with a stretchable passage such as a rubber pipe Is small.

According to the fifth aspect of the present invention, since the outside air introduction unit and the air conditioning unit are connected and connected by the flexible pipe member, the outside air passage is shut off from the outside irrespective of the opening and closing of the upper part of the bonnet. Will be able to this is,
This is advantageous in that there is less danger of foreign matter such as dust and dirt entering the device than when an outside air passage that is isolated from the outside is formed only when the upper portion of the hood is closed.

According to the sixth aspect of the present invention, since the inside air introduction portion that opens into the cabin is provided near the blower in the air conditioning unit, the air inside the cabin is used.
Heating or cooling can be performed more efficiently than air conditioning by taking in outside air, and inside air can be efficiently taken in from the vicinity of the blower.

[Effects] In the air conditioner for a working machine according to any one of the first to sixth aspects, the air conditioning unit is arranged on the front panel portion in the cabin, and the outside air introduction portion is arranged outside the cabin according to functions. In addition, the height of the operation unit can be suppressed to be low while the air-conditioning operation can be efficiently performed.

In the air conditioner for a working machine according to any one of claims 2 to 5, by arranging the outside air introduction portion in the hood,
While keeping the bonnet height low, the space inside the bonnet can be used effectively, making it effective for low-floor tractors, etc.
The compactness can be achieved by the centralized arrangement.

In the air conditioner for a working machine according to any one of claims 3 to 5, the outside air introduction section is disposed above the hood, which is the side that is swingably opened and closed, so that it is simple and convenient without any special device or space. This has the advantage that the outside air introduction part can be maintained.

In the air conditioner for a working machine according to the fourth aspect,
By providing the outside air intake port near the opening / closing pivot at the top of the bonnet, the communication connection accuracy due to the closing of the hood between the movable outside air intake port and the fixed side outside air passage is excellent, or the communication connection member is small and inexpensive. There is an advantage that things can be used.

In the air conditioner for a working machine according to claim 5,
While providing an outside air intake port on the top of the openable hood,
Foreign matter such as dust was not sucked into the air conditioning unit, and the reliability and durability of the device could be improved.

In the air conditioner for a working machine according to claim 6,
The inside air introduction structure that allows efficient air conditioning in the cabin was realized with good intake efficiency.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a low-floor tractor with a cabin, 1 is a front wheel, 2 is a rear wheel, 3 is a cabin, 4 is a driving unit, 5 is a bonnet, 6 is a tilling rotary, 7 is a lifting link mechanism, M is the mission case, 21
Is the engine. The clutch housing portion 21c of the engine 21 at the front of the vehicle body and the transmission case M at the rear of the vehicle body
The front end is connected and integrated by a box-shaped connecting frame 29, and is a so-called monobody structure body frame.

As shown in FIGS. 1 and 8, the link mechanism 7 is a three-point link mechanism, which connects a pair of left and right lower links 8 for tilling rotary connection to the rear portion of the vehicle body B. A top link 9 for restricting swinging of the tilling rotary 6 mounted on the rear end around a pivot connection point with the lower link 8 is connected, and a lift rod is connected to a corresponding one of the left and right lower links 8. A pair of left and right lift arms 11, which are connected to each other via a pair 10, are connected to be vertically swingable. Left and right lift arms 11
A single-acting hydraulic lift cylinder 18 that integrally drives the upper and lower rockers is integrally provided above the transmission case M.

Next, the fuel tank T and its mounting structure will be described. As shown in FIGS. 9 to 12, the driver seat 32 is disposed above the transmission case M between the left and right rear wheel fenders 30 and 31, and is disposed between the driver seat 32 and the transmission case M. The seat floor 33 separating the driver's seat side portion and the transmission case M side portion is connected to the bottom surface 32a of the seat portion 32A of the driver seat 32 and the backrest portion 3.
It is formed and provided in a substantially L-shape in side view along the back surface 32b of the 2B.

Under the seat floor 33, a thin flat fuel tank T having a substantially L-shaped surface m along the back surface of the seat floor 33 when viewed from the side is provided. It is arranged along the inner side surface 31a of the fender 31.

The fuel tank T is roughly divided into a driver's seat 32
, And a tank upper part Tb located behind the driver's seat 32. The upper surface 35 (= surface m) of the tank lower part Ta is a bottom surface 32a of the seat 32A in a side view. , The front surface 36 (= surface m) of the tank upper part Tb is along the back surface 32b of the backrest 32B. The fuel tank T is provided for preventing interference with the transmission case M and mechanical devices such as the lift cylinder 18, the lift arm 11, and its movement trajectory erected at the rear end thereof, the seat floor 33, and the right rear wheel fender 31. In order to increase the tank capacity as much as possible, it has a complicated shape.

That is, a lateral bulge extending leftward so as to extend between the upper part of the seat floor 33, the transmission case M and the lift cylinder 18 over the upper part of the tank lower part Ta and the front part of the tank upper part Tb. At the rear of the tank upper portion Tb, a side recess 37b cut to the right is formed to avoid interference with the lift arm 11. As a result, the left and right side surfaces 34,
Of the 37, the left lateral side 37 on the left and right center side of the vehicle body is roughly
It is formed in a shape that leans outward in the left-right direction of the vehicle body toward the rear. In side view, the fuel tank T is disposed so as to straddle the front and rear of the rear axle 38. When the fuel is full, the center of gravity of the fuel tank T is
It is convenient if it is configured so as to be located on the front side of the eight axis P.

The fuel tank T has a left-right alignment structure in which left and right sheet metal tank members 39 and 40 are welded and integrated, and a flange portion 41, which is a welding portion thereof, is fixed to the inner surface 31a of the right rear wheel fender 31. After the mounting, two mounting stays 42 and three mounting stays 43 fixed to the seat floor 33 are bolted to a total of five locations.
The seat floor 33 is bolted in a state of spanning a left plate flange portion (not shown) fixed to the inside of the left and right rear wheel fenders 30 and 31 and a right plate flange portion 31f. That is, the seat floor 33, the right rear wheel fender 31, and the fuel tank T are integrated so as to be reinforcing members, and the support strength of these three members is mutually increased.

The fuel tank T has a fuel outlet 4 provided in a lower bulging portion 44 formed in front of and below the tank lower part Ta.
5 and a fuel supply port 4 provided at the upper end of the rear part of the tank upper part Tb.
6 is provided with a fuel return port 47 disposed in front of the fuel cell 6, and a fuel gauge 48 for detecting the fuel remaining in the tank. The fuel gauge 48 is a general one comprising a potentiometer 48a provided at the lower part of the tank upper part Tb so as to be freely attached and detached from the rear, a float 48c attached to the tip of the swing arm 48b, and the like. The float 48c is set so as to swing from the upper part of the tank lower part Ta to the upper and lower middle positions of the tank upper part Tb. The fuel supply port 46 is provided with a cap 46a.

On the left side of the driver's seat 32, the main shift lever 6
1 and an operation lever R such as an auxiliary transmission lever 62 are disposed, and a fuel tank T is disposed on the right side of the driver's seat 32. By arranging the fuel tank T and the operation lever R in the left and right directions, it is possible to simultaneously arrange the interlocking mechanism (not shown) of the operation lever R at the lower left position of the driver seat 32 and secure the capacity of the fuel tank T. Is planned.

Next, the air conditioner A will be described. FIG.
As shown in FIG. 7, a condenser 52 for refrigerant disposed on the front side of the radiator 51 in the bonnet 5,
An air conditioner A capable of cooling and heating and dehumidifying the inside of the cabin 3 by an outdoor unit Aa including a compressor 53 and the like for compressing a refrigerant driven by the engine 21 and an indoor unit Ab arranged mainly in the front panel 54 of the cabin 3. Is configured. The indoor unit Ab includes an outside air introduction unit 55 arranged at an upper portion of a rear end inside the hood 5 and an air conditioning unit 63 arranged at a front panel 54 in the cabin 3.

As shown in FIG. 2, the bonnet 5 comprises a bonnet lower part 5A fixed to the vehicle body, and a bonnet upper part 5B swingably openable and closable with respect to the bonnet lower part.
An outside air introduction portion 55 is provided on the upper portion 5B of the hood. A substantially U-shaped machine frame 64 for partitioning the bonnet 5 from the driving unit 4 is provided upright from the vehicle body frame.
It is supported around the machine frame 64. The outside air introduction part 55 is composed of an outside air suction port 65 provided through a through hole 5b formed in the ceiling surface of the bonnet upper part 5B, and an air filter part 66 following the outside air intake part 65.
Attached to the A side.

The upper portion 5B of the hood is provided with an intake cover 72 covering the through hole 5b. That is, FIG.
As shown in FIG. 5, an intake cover 72 is formed of a substantially downward U-shaped sheet metal material that crosses the upper part of the hood left and right, and a plurality of intake slits 73 are formed on the left and right side surfaces. The outside air is taken in from the left and right sides of the bonnet 5 through a suction passage 74 formed between the inside surface of the suction cover 72 and the inside of the suction cover 72, so that rain, debris, dust, and the like are prevented from entering the upward outside air suction port 65 as much as possible.

That is, the lower case 67A and the upper case 67
B is provided with an element 68 for air filtration on a casing 67 constituted by the cylindrical portion 6B and the cylindrical portion 6 projecting upward from the upper case 67B.
An outside air suction port 65 is formed at 7b. Lower case 67
A is integrally formed with a lateral passage 67a for communicating the taken outside air to the air conditioning unit 63, and a connection port at the end thereof is formed in a rearwardly facing triangular shape.

The through hole 5b and the cylindrical portion 67b are
It is fitted so as to be able to move up and down relatively through a rubber seal or the like. By closing the bonnet upper part 5B, the outside air is taken in from the intake slit 73.
When B is lifted and opened, the cylindrical portion 67b is separated from the through hole 5b.

As shown in FIGS. 2 and 3, the air conditioning unit 6
Reference numeral 3 denotes a blower 56 that sucks and blows outside air from the outside air introduction unit 55, a heat exchanger (evaporator) 57 for cooling, a heat exchanger 58 for heating, an outlet 59, and the like. The blower 56 includes a casing 60 disposed on the left side of the handle support 71 and a cross flow fan 69 provided therein, and sucks outside air from the lateral passage 67 a through the communication passage 75, though not shown. From the ventilation state and the intake grill (an example of the inside air introduction part of claim 6) 70 to the cabin 3
And a circulating state for sucking inside air can be switched.

The handle support 71 for supporting the steering handle 77 is erected from the vehicle body frame.
It is also relatively fixed to a partition wall 78 stretched on the machine frame 64 to separate the bonnet 5 from the operation unit 4.
The support strength between the handle 8 and the handle support 71 is mutually reinforced.

With the heat exchanger 57 for cooling down,
This and a heat exchanger 58 for heating are vertically overlapped in a lying position, and the bonnet 5 is positioned above the blower 56 and in a side view.
It is arranged so as to straddle the front and rear of the machine frame 64 in a state where it protrudes inside. Therefore, the wind blown up from the blower 56 is supplied to the inside of the cabin 3 from the outlet 59 in a state of being cooled, heated, or dehumidified by passing through the heat exchangers 57, 58.

In this tractor, a part of the air conditioner A (external air introduction part 55) is provided at a place where the fuel tank is conventionally placed.
, The fuel tank T is mounted on the rear of the vehicle body between the left and right rear wheels 2 and 2 below and behind the driver's seat 32. Thereby, even if it has a complicated shape, by arranging it in a narrow space, the height of the cabin 3 and the driver's seat 32 are set to a low position while the air conditioner A is provided, and a low level suitable for a house or an orchard or the like is provided. We have succeeded in constructing a floor type tractor.

[Alternative Embodiment] As shown in FIG. 13, an upper portion 5B of the bonnet is provided with an outside air introduction portion 55 having an outside air suction port 65 and an element 68. The communication path 75 of the air conditioning unit 63 may be connected to the bellows hose (an example of a flexible pipe member according to claim 5). In this structure, even if the upper part 5B of the hood is opened and closed, there is no place to open between the outside air introduction part 55 and the air conditioning unit 63, so that clean air can be taken in and the air conditioning unit 63 is hardly contaminated. preferable.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor.

FIG. 2 is a side view of a front portion of a vehicle body showing the air conditioner.

FIG. 3 is a plan view showing an air conditioner.

FIG. 4 is a cross-sectional rear view showing a structure of an outside air introduction unit.

FIG. 5 is a sectional side view of a main part showing a structure of an outside air introduction unit.

FIG. 6 is a side view showing a support structure of the steering handle.

FIG. 7 is a rear view showing the handle post and the partition wall.

FIG. 8 is a side view showing the structure of the link mechanism.

FIG. 9 is a rear view of the rear part of the tractor.

FIG. 10 is a side view showing a fuel tank portion.

FIG. 11 is a rear view showing a fuel tank portion.

FIG. 12 is a plan view showing a fuel tank portion.

FIG. 13 is a side view showing another structure of the outside air introduction unit.

[Explanation of symbols]

 Reference Signs List 3 Cabin 4 Operating part 5 Bonnet 5A Bonnet lower part 5B Bonnet upper part 54 Front panel 55 Outside air introduction part 56 Blower 57 Heat exchanger 63 Air conditioning unit 65 Outside air suction port 70 Inside air introduction part 76 Flexible pipe member Z pivot

Claims (6)

[Claims] An air conditioner including a heat exchanger and a blower is provided on a front panel portion in a cabin that covers an operation unit, and a working machine having an outside air introduction unit for the air conditioner unit is provided outside the cabin. Air conditioner. 2. The air conditioner for a working machine according to claim 1, wherein the outside air introduction portion is provided in a hood disposed adjacent to a front of the front panel. 3. The bonnet comprises a lower portion of the hood fixed to the vehicle body and an upper portion of the hood swingably openable and closable with respect to the lower portion of the hood, and the upper portion of the hood is provided with the outside air introducing portion. 3. The air conditioner for a working machine according to 2. 4. An outside air intake port in the outside air introduction section,
4. The air conditioner for a working machine according to claim 3, wherein the air conditioner is disposed near a pivot for swinging and opening the upper part of the bonnet. 5. A flexible pipe member connecting and connecting the outside air suction port and a portion of the outside air introduction section fixed to a lower portion of the bonnet, or the air conditioning unit. An air conditioner for a working machine according to claim 1. 6. The air conditioner for a working machine according to claim 1, further comprising an inside air introduction portion that opens into the cabin near the blower in the air conditioning unit.