JP3530836B2 - Tractor with low vehicle height cabin - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a tractor with a cabin.

[0002]

2. Description of the Related Art As shown in Japanese Utility Model Laid-Open No. 64-16903, an air conditioning unit is provided in a ceiling portion inside a cabin, and as shown in Japanese Patent Laid-Open No. 7-47832, a front portion of a vehicle body is installed. It is known that an air conditioning unit is arranged above the engine inside the bonnet.

[0003]

In the former prior art, since the air conditioning unit is arranged right above the operating section to be air-conditioned, it is possible to efficiently air-condition and narrow the living space in the cabin. In addition to the advantage that the number is small, the latter technique is also preferable in that the air conditioning unit can be arranged close to the power source, the operating efficiency is excellent, and the mechanical devices can be centrally arranged in the bonnet.

However, in the former prior art,
Since the cabin height for the air conditioning unit is high, the position of the center of gravity is high because the heavy air conditioning unit is in a high position, and the working machine with a relatively high height constraint such as a low floor type tractor for houses and orchards. It is not suitable for small models. Further, in the latter prior art, since most of the air conditioning unit is installed in the bonnet, the height of the bonnet is higher than usual and it is easy to obstruct the forward field of view (especially for a short operator. In the case), again, it is not suitable for the working machine or the small model, which is severely restricted in height.

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 that keeps the total height of a low floor type tractor low.

[0006]

According to a first aspect of the present invention, there is provided a tractor having a cabin with an air conditioner, wherein an engine, a clutch housing, and a transmission case are connected in this order to form a main body of the tractor . the pre SL lifting cylinder for the working device lifting the upper rear surface of the transmission case mounted in an upright position, the lift cylinder is out of the cabin
From the driver's seat behind and in the rear of the cabin
Also deploy the cabin so that it is located in the rear,
Place the driver's seat in the cabin on the rear of the mission case
Place the air conditioner unit close to the
Inside the cabin so that it is located above the latch housing.
It is characterized by being arranged in the front part .

According to a second aspect of the invention, in the first aspect of the invention, the outside air introducing portion of the air conditioner unit is provided at the rear portion of the hood in front of the cabin.

According to a third aspect of the present invention, in the second aspect of the invention, the outside air intake port of the outside air introduction portion is provided laterally of the bonnet.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. A low floor tractor with a cabin is shown in FIGS. 1 and 2, where 1 is a front wheel, 2 is a rear wheel, 3 is a cabin, 4 is an operating part, 5 is a bonnet, 6 is a rotary tiller, 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 mission case M at the rear of the vehicle body
The front end portion is connected and integrated with a box-shaped connecting frame 29, which 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 cultivating rotary connection to the rear portion of the vehicle body B, and A top link 9 for restricting swinging of the tilling rotary 6 attached to the rear end around the pivotal connection point with the lower link 8 is connected, and lift rods are respectively connected to the corresponding left and right lower links 8. A pair of left and right lift arms 11 connected via 10 are connected so as to be vertically swingable. Left and right lift arms 11
A single-acting hydraulic lift cylinder 18 for integrally swinging up and down is integrally provided on the upper side of the mission case M.

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

Below the seat floor 33, there is a flat fuel tank T which has a substantially L-shaped surface m along the back surface of the seat floor 33 in a side view and is thin and flat on the left and right. It is arranged along the inner surface 31a of the fender 31.

The fuel tank T is roughly classified into a driver seat 32.
And a tank upper part Tb located behind the driver's seat 32, and the upper surface 35 (= surface m) of the tank lower part Ta is the bottom surface 32a of the seating portion 32A in a side view. The front surface 36 (= surface m) of the tank upper portion Tb extends along the back surface 32b of the backrest portion 32B. The fuel tank T interferes with the transmission case M, the lift cylinder 18 standing on the rear end of the transmission case M, the lift arm 11 and its movement locus, the seat floor 33, and the mechanical devices such as the right rear wheel fender 31. In order to maximize the tank capacity while avoiding it, it has a complicated shape.

That is, the lateral bulging portion is provided on the upper portion of the tank lower portion Ta and the front portion of the tank upper portion Tb, and protrudes leftward so as to enter between the seat floor 33, the transmission case M and the lift cylinder 18. 37a and a rear portion of the tank upper portion Tb are formed with a lateral recessed portion 37b which is carved rightward in order to avoid interference with the lift arm 11. As a result, the left and right lateral sides 34 of the fuel tank T,
Of the 37, the left lateral surface 37 on the left-right center side of the vehicle body is roughly
The shape is formed so as to be closer to the outside in the left-right direction of the vehicle body as it goes rearward. Further, the fuel tank T is arranged so as to straddle the front and rear of the rear axle 38 in a side view. When the fuel is fully filled, the center of gravity of the fuel tank T is
It is convenient if it is configured so as to exist on the front side of the 8-axis center P.

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

In the fuel tank T, the fuel delivery port 4 is provided at a lower bulge portion 44 formed at the lower front of the tank lower portion Ta.
5 and a fuel supply port 4 provided at the upper rear end of the tank upper portion Tb
A fuel return port 47 disposed in front of the fuel cell 6 and a fuel gauge 48 for detecting the fuel remaining amount in the tank are provided. The fuel gauge 48 is a general one composed of a potentiometer 48a, which is attached to the lower portion of the tank upper portion Tb so as to be detachably attached 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 portion of the tank lower portion Ta to the upper and lower intermediate positions of the tank upper portion Tb. The fuel supply port 46 is equipped with a cap 46a.

On the left side of the driver's seat 32, the main transmission lever 6
1 and an operation lever R such as the auxiliary shift lever 62 are arranged, and the fuel tank T is arranged on the right side of the driver's seat 32. By allocating the fuel tank T and the operating lever R to the left and right, it is possible to both arrange the interlocking mechanism (not shown) of the operating lever R in the lower left position of the driver seat 32 without difficulty and to secure the capacity of the fuel tank T. Is intended.

Next, the air conditioner A will be described. Figure 2
~ As shown in FIG. 7, a condenser 52 for the 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 for compressing a refrigerant driven by the engine 21 and an indoor unit Ab mainly arranged in the front panel 54 of the cabin 3. Is configured. The indoor unit Ab is composed of an outside air introducing portion 55 arranged at the upper rear end portion inside the bonnet 5 and an air conditioner unit 63 arranged at a front panel 54 portion in the cabin 3.

As shown in FIG. 2, the bonnet 5 is composed of a bonnet lower portion 5A fixed to the vehicle body and a bonnet upper portion 5B swingably opened and closed with respect to the bonnet lower portion,
An outside air introducing portion 55 is provided on the bonnet upper portion 5B. A substantially downward U-shaped machine frame 64 for partitioning the bonnet 5 and the driving unit 4 is erected from the vehicle body frame, and the bonnet upper portion 5B has a rear end portion in the left-right pivotal fulcrum Z.
It is supported around the machine frame 64 around it. The outside air introduction part 55 is composed of an outside air intake port 65 provided through the 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 port 65.
It is attached to the A side.

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

That is, the lower case 67A and the upper case 67
A casing 67 configured with B is equipped with an element 68 for air filtration to configure an air filter portion 66, and a cylindrical portion 6 protruding upward from an upper case 67B.
An outside air suction port 65 is formed at 7b. Lower case 67
A lateral passage 67a for communicating the taken-in outside air with the air conditioner unit 63 is integrally formed in A, and the connection port at the end thereof is formed in a rearward facing triangular shape.

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

As shown in FIGS. 2 and 3, the air conditioner unit 63 has a blower 56 that sucks and blows the outside air from the outside air introduction portion 55, and a heat exchanger (evaporator) 5 for cooling.
7, a heat exchanger 58 for heating, an outlet 59 and the like. The blower 56 is configured by incorporating a cross-flow fan 69 in a casing 60 arranged on the left side of the handle support portion 71, and sucks outside air from a sideways passage 67 a through a communication passage 75 (not shown). The ventilation state and the circulation state in which the inside air of the cabin 3 is sucked from the intake grill (an example of the inside air introducing portion of claim 6) 70 are switchable.

The handle support portion 71 for supporting the steering handle 77 is erected from the body frame and
It is also fixed relatively to a partition wall 78 stretched on the machine frame 64 to partition the bonnet 5 from the operating section 4.
8 and the handle supporting portion 71 are designed to reinforce each other.

With the heat exchanger 57 for cooling down,
This and the heat exchanger 58 for heating are vertically stacked in a recumbent posture, above the blower 56, and in the side view to the bonnet 5.
It is arranged so as to straddle the front and rear of the machine frame 64 in a state of being projected inward. Therefore, the air blown up from the blower 56 passes through the heat exchangers 57 and 58 to be cooled, heated, or dehumidified and supplied from the outlet 59 into the cabin 3.

In this tractor, a part of the air conditioner A (outside air introduction part 55) is installed at a place where a fuel tank is conventionally placed.
Therefore, the fuel tank T is mounted between the left and right rear wheels 2 and 2 below the driver seat 32 and at the rear of the vehicle body. As a result, by placing the air conditioner A in a narrow space even if the shape is complicated, the height of the cabin 3 and the driver's seat 32 are set to a low position, which is suitable for a house or an orchard. It has succeeded in constructing a floor type tractor.

[Other Embodiments] As shown in FIG. 13, the bonnet upper portion 5B is provided with an outside air introducing portion 55 having an outside air suction port 65 and an element 68, and the outside air introducing portion 55 on the oscillating movement side is provided. The communication passage 75 of the air conditioning unit 63 may be connected by a bellows hose (an example of a flexible pipe member according to claim 5) 76 for communication. In this structure, the bonnet upper part 5
Even if B is opened / closed, there is no place to open between the outside air introduction part 55 and the air conditioning unit 63, so that a cleaner outside air can be taken in and the air conditioner unit 63 is less likely to get dirty, which is preferable.

[Brief description of 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 an air conditioner.

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

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

FIG. 5 is a cross-sectional side view of an essential part showing the structure of an outside air introduction part.

FIG. 6 is a side view showing a support structure of a 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 introducing section.

[Explanation of symbols]

3 cabins 5 bonnet 18 Lift cylinder 21 engine 21c clutch housing 32 driver's seat 55 Outside air introduction section 63 Air conditioner unit 73 Outside air intake M mission case

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification symbol FI B62D 33/06 B60K 15/02 B E02F 9/16 B62D 33/06 A (56) Reference JP-A-9-39686 (JP, A) JP-A-8-108741 (JP, A) JP-A-7-47832 (JP, A) Actual development Sho 58-134125 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) ) B62D 49/00 B60H 1/00 102 B60H 1/32 614 B60K 15/063 B62D 33/06 E02F 9/16

Claims (3)

(57) [Claims] 1. A tractor having a cabin air-conditioned, the engine, the clutch housing, constitutes a body of the tractor the machine by connecting the transmission case in this order, the working device lifting the upper rear surface of the front Stories transmission case Install the lift cylinder in a standing position, and lift cylinder
Driver's seat behind the cabin and behind the cabin
If you deploy the cabin so that it is located behind the seat
Also, the driver's seat in the cabin is
Arranged close to the rear upper surface, the air conditioner unit,
The cab should be located above the clutch housing.
A low vehicle height cab with a cabin, which is located in the front part of the vehicle. 2. The low vehicle height type cabin-equipped tractor according to claim 1, wherein an outside air introduction portion of the air conditioner unit is provided at a rear portion of a hood in front of the cabin. 3. The low vehicle height type cabin-mounted tractor according to claim 2, wherein an outside air intake port of the outside air introduction portion is provided on a lateral side of the bonnet.