JPH0446795B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a lift arm at the rear of the machine body that connects a working device so that it can be raised and lowered, and the driver's seat can be freely changed between a forward-facing mounting state and a rear-facing mounting state. In addition, the handle for steering the aircraft, and the clutch pedal and brake pedal for driving the aircraft can be freely repositioned to the front side of the aircraft from the driver's seat in a forward-facing mounted state, and to the rear side of the aircraft from the driver's seat in a rear-facing mounted state. This invention relates to an agricultural tractor installed in

[Conventional technology]

In the agricultural tractor, the driver's seat can be changed to a rear-facing installation state, and the handle, clutch pedal, and brake pedal can be replaced to the rear side of the body of the rear-facing seat, so that the tilling device and the transport device can be connected to the rear of the body. In addition to work,
It is configured so that it can also be used for work in which various work devices such as a lift device are connected to be operated using the lift arm.

Conventionally, in this type of agricultural tractor, the machine direction has been determined by steering only the front wheels, which has had the following disadvantages.

[Problem that the invention seeks to solve]

For example, when the lift device is connected, when the aircraft turns, especially when turning in a small radius, the rear wheels may spin, the lift device may vibrate, and the cargo may shake significantly, or it may take a long time to pull the aircraft toward the ground. The work efficiency of the staff was getting worse.

SUMMARY OF THE INVENTION An object of the present invention is to enable an aircraft to turn in a state where wheel spin is less likely to occur and to quickly bring the aircraft closer together.

[Means for solving problems]

The characteristic structure of the present invention is that, in the agricultural tractor described at the beginning, each of the front wheels and the rear wheels is mounted so as to be freely steerable, and the front wheels and the rear wheels are both mounted in a forward-facing state or a backward-facing state. The linkage mechanism includes a first control mode in which the front wheels and the rear wheels are steered in the same direction as a steering operation of the aircraft orientation handle, and a first control mode in which the front wheels and the rear wheels are steered in the same direction as the aircraft orientation handle is operated. The vehicle may be provided with a switching mechanism capable of switching to a second control mode in which the front wheels and rear wheels are steered in opposite directions as the steering wheel is operated.

[Effect]

A first control mode in which both the front wheels and the rear wheels can be steered by the function of the linkage mechanism, and the front wheels and the rear wheels are steered in the same direction by operating the switching mechanism; , and a second control mode in which the front wheels and rear wheels are steered in opposite directions.

If the first control mode is selected, the pulling operation of the machine body can be performed more quickly than in the past, and the working device can be quickly aligned to the target position.

If the second control mode is selected, both the front and rear wheels become steering wheels when the aircraft turns, so wheel spin of the rear wheels is less likely to occur compared to the conventional system where only the front wheels were steering wheels. This reduces the vibrations imparted to the connected working equipment, making it less likely that the load will collapse, and it also allows for tighter turns with a smaller turning radius than before.
By reducing the need to turn the steering wheel when turning, it becomes possible to make small turns quickly and with a smaller turning space.

〔Effect of the invention〕

As a result, by steering all four wheels and linking the front wheels and rear wheels in a state where the steering direction can be selected and set, the efficiency of positioning work such as quick pulling of the aircraft has been improved, and the efficiency has been significantly improved. We have been able to provide an agricultural tractor that has been improved in various ways, such as being able to smoothly make small turns and work safely and efficiently.

〔Example〕

As shown in FIGS. 4 and 5, a pair of left and right front wheels 1a, 1b and a pair of left and right rear wheels 2a, 2b having approximately the same outer diameter as the front wheels 1a, 1b are each drivably provided, and , a lift arm 6 is provided at the rear of the traveling aircraft, which is equipped with a driving unit 3, a driver's seat 4, a rotary handle 5 for aircraft orientation, etc., so that it can be swung up and down by a hydraulic cylinder 7, and A power output shaft 8 is provided to constitute an agricultural tractor.

The driving unit 3 is constructed by forming the front end 10a of the crankshaft 10 of the engine 9 as a power extraction shaft, disposing a radiator 11 and a rotating fan 12 for cooling the engine behind the engine 9, and installing a headlamp 1.
A headlamp accommodating part of an engine bonnet 15 is provided with a light passing part 14 which leaks a part of the light from the front wheels 1a and 1b near the front of the front wheels 1a and 1b to illuminate the front wheels.

The driver's seat 4 can be mounted in a forward facing state on the fuselage part located between the left and right rear wheel fenders 16a and 16b as shown in FIGS. 4 and 5, or mounted on the engine bonnet as shown in FIGS. 6 and 7. The driver's seat 4 is configured so that the driver's seat 4 can be installed in a rearward-facing position at the rear end of the driver's seat 15 where the seat attachment cover 17 has been removed.

As shown in FIG. 1, a pair of front wheels 1a, 1b
is attached to the transmission case 18 on the aircraft side so as to swing around the axis _P1 so that it can be steered, and the pair of rear wheels 2a and 2b are attached to the transmission case 19 on the transmission case 19 so that it can be steered. It is installed so that it swings around _P2 . A tie rod 21 that interlocks and connects the knuckle arms 20 of the left and right front wheels 1a and 1b, a steering cylinder 22 for the front wheels, a left and right rear wheel 2a,
A link mechanism 24 that interlocks and connects the knuckle arms 23 of 2b, a rear wheel steering cylinder 25, a control valve 2 for each of the front wheel steering cylinder 22 and the rear wheel steering cylinder 25.
6 or 27, a pair of detection mechanisms 29 and 30 that detect the rotation direction and rotation angle of the steering wheel 5, and electrically take out the detection results and output them to the steering control device 28. As the handle 5 is operated, the front wheels 1a, 1b and the rear wheels 2 change directions and angles corresponding to the rotation direction and rotation angle of the handle 5, respectively.
A linkage mechanism 31 is configured to link the handle 5 with the front wheels 1a, 1b and the rear wheels 2a, 2b so that each of the wheels a and 2b can be steered. Each of the pair of detection mechanisms 29 and 30 is provided with a handle connection portion 29a or 30a for removably supporting the handle 5 and interlocking the handle 5 in a separable manner, and the handle connection portion 29a of one of the detection mechanisms 29 is located on the front side of the fuselage than the driver's seat 4 which is mounted in a forward-facing state, and the handle connecting portion 30a of the other detection mechanism 30 is located on the rear side of the aircraft with respect to the driver's seat 4 which is in a rear-facing mounted state. A pair of the detection mechanisms 29, 3
0 is placed. As shown in FIG. 2, from the engine 9 to the driving transmission (not shown)
A first clutch rod 33 connected at one end to the swing operation arm 32a of the clutch 32 for transmission of power to the clutch 32, a first pedal attachment member 34, a second clutch rod 35, a swing interlocking member 35, a third clutch rod 36, and a second pedal. Each of the attachment members 37 constitutes an interlocking mechanism for interlocking the clutch 32 with a clutch pedal 38 for operation. The first pedal attachment member 34 and the second pedal attachment member 37 are connected to the first pedal attachment member 3
4 is located on the front side of the fuselage than the driver's seat 4 which is mounted in a forward-facing state, and the second pedal attachment member 37 is located on the rear side of the aircraft with respect to the driver's seat 4 which is mounted in a rearward-facing state. At the same time, the clutch pedal 38 is configured to be attachable and detachable. As shown in FIG. 3, a pair of brakes 3 act on the left and right rear wheels 2a, 2b separately.
9 and 40, the brake 39 or 4
a first brake rod 41 and a second brake rod 42, one end of which is connected to the swing operating arm portion 39a or 40a of 0; a first pedal attachment member 43;
The swinging connection member 44, the push-pull interlocking member 45, and the second pedal attachment member 46 constitute an interlocking mechanism 49 or 50 that interlocks the operating brake pedal 47 or 48 with the brake 39 or 40, respectively. be. The first pedal mounting member 43 and the second mounting member 46 are located on the front side of the aircraft body relative to the driver's seat 4 in which the first pedal mounting member 43 is mounted in a forward facing state, and
The second pedal attachment member 46 is arranged so as to be located on the rear side of the aircraft body than the driver's seat 4 which is mounted in a rearward facing state, and the brake pedal 47 or 48 is configured to be attachable and detachable. In other words, the handlebar 5, the clutch pedal 38, and the pair of brake pedals 47, 48 are arranged on the front side of the aircraft body relative to the driver's seat 4 in a forward-facing mounted state as shown in FIGS. 4 and 5, or As shown in FIG. 7, it can be placed on the rear side of the fuselage compared to the driver's seat 4 which is installed facing backwards.

Specifically, as shown in FIGS. 4 and 5, a transport vehicle or the like is connected to the rear part of the fuselage to be operated by the lift arm 6 via a link mechanism 51 to raise and lower the transport device 52, and is steered toward the front of the fuselage. As shown in FIG. 6, a lift device 54 may be connected to the rear of the vehicle for lifting and lowering operations via a coupling mechanism 53 that swings up and down with the lift arm 6, as shown in FIG. It is possible to configure a rearward-steer type work vehicle such as a cargo handling vehicle that steers while facing the rear of the machine, and in any case, the front wheels 1a, 1b and the rear wheels 2a, 2b can be steered. The aircraft is oriented accordingly.

A first control mode in which the steering control device 28 is operated so that the front wheels 1a, 1b and rear wheels 2a, 2b are all directed in the same direction with respect to the aircraft body as shown in FIG. 8, and FIG. As shown in FIG. 2, a switching mechanism 55 is configured to switch between a second control mode in which the front wheels 1a, 1b and the rear wheels 2a, 2b are steered in opposite directions with respect to the aircraft body. It is possible to perform parallel steering to enable diagonal driving, and V-shaped steering to enable tight turns.

Note that 56 shown in FIG. 4 is a top link cylinder for dumping the transport device 52;
7 is a stand for standing the transport device 52 removed from the tractor, and 58 is a kita star wheel.

[Another example]

The conveying device 52 can be changed to a rotary tiller, a trencher, etc., and these can be replaced with the working device 5.
Collectively referred to as 2.

[Brief explanation of drawings]

The drawings show an embodiment of the agricultural tractor according to the present invention, in which Fig. 1 is a schematic diagram of the steering device, Fig. 2 is a side view of the clutch operating structure, Fig. 3 is a side view of the brake operating structure, and Fig. 4. is a side view of the agricultural tractor in a state in which the transport device is connected, FIG. 5 is a plan view of the agricultural tractor in the state in which the transport device is connected, FIG. 6 is a partially cutaway side view of the agricultural tractor in the state in which the lift device is connected, and FIG. Plan view of the connected state of the lift device of the agricultural tractor, No. 8
9 and 9 are schematic plan views illustrating the steering configuration. 1a, 1b...front wheel, 2a, 2b...rear wheel, 4...driver seat, 5...handle for aircraft direction, 6...lift arm, 31...linkage mechanism, 3
8...Clutch pedal, 47, 48...Brake pedal, 52...Work device, 55...Switching mechanism.

Claims (1)

[Claims] 1. A lift arm 6 that connects the working device 52 so as to be able to be raised and lowered is provided at the rear of the aircraft body, and a driver's seat 4 is provided that can be freely changed between a forward-facing mounting state and a rear-facing mounting state, and a handle 5 for aircraft orientation;
An agricultural tractor in which a clutch pedal 38 and brake pedals 47, 48 for running the machine are provided so as to be freely repositionable to the front side of the machine body from the driver's seat 4 in a forward-facing mounted state and to the rear side of the machine body from the driver's seat 4 in a backward-facing mounted state. The front wheels 1a, 1b and the rear wheels 2a, 2b are mounted to be steerable, respectively, and the front wheels 1a, 1b and the rear wheels 2 are mounted so as to be freely steerable.
Both a and 2b are provided with a linkage mechanism 31 that is linked to the aircraft orientation handle 5 in a forward-facing or backward-facing mounting state, and this linkage mechanism 31 includes a The front wheels 1a, 1b and the rear wheels 2
a, 2b are steered in the same direction, and the front wheels 1a, 1b and the rear wheels 2a,
2b is provided with a switching mechanism 55 that can freely switch between the control mode 2b and the second control mode in which the control modes 2b and 2b are steered in opposite directions.