JPH034430B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tractor with a work implement used for agricultural work, light civil engineering work, etc.

(Prior Art) A tractor is a moving motor vehicle, and usually a working machine is attached to either the rear or the front for plowing, digging, etc.
It is used for various tasks such as harvesting.

In addition, there is a tractor equipped with work equipment at the front and rear of the tractor, as disclosed in Japanese Utility Model Application Publication No. 54-163002. This conventional technology includes a front loader at the front of a two-axle, four-wheel tractor, and a backhoe at the rear. Each is equipped with the following.

(Problems to be Solved by the Invention) Conventional tractors with work equipment, such as those described in the above-mentioned publications, are equipped with work equipment at the front and rear parts, but when making a turn, the tractor This requires a large turning radius, which means that the unworked area, or headland, becomes large, and the headland must be worked by hand, resulting in poor work efficiency. Ta.

In addition, tractors need to obtain a large tractive force with their drive wheels, and for this reason, the weight of the vehicle is added to the drive wheels or auxiliary weights are attached to the drive wheels. With the latter method, the installation work becomes troublesome.

(Means for Solving the Problems) The present invention increases tractive force and improves turning performance by controlling the lifting and lowering of work implements mounted on the front and rear of a tractor body in association with the drive wheels of a traveling device. The purpose is to improve the results.

In order to achieve the intended purpose, the tractor with work equipment according to the present invention takes the following technical measures.

That is, the present invention provides a tractor body comprising an engine and a transmission case connected to the rear of the engine; front wheels and rear wheels provided at the front and rear portions of the tractor body; a front end of the tractor body; a front connecting device and a rear connecting device that are pivotally connected to the front and rear end portions so as to be vertically swingable; A front working machine and a rear working machine of the same type are connected to the front and rear connecting devices, respectively, so that the work progress directions are opposite to each other. - A forward/reverse switching mechanism that switches to reverse rotation, and a front wheel transmission device and a rear wheel transmission device that transmit engine power from the forward/reverse switching mechanism to the front wheels and rear wheels; A front wheel clutch that disconnects and connects power transmission; a rear wheel clutch that is installed in the rear wheel transmission device and disconnects and connects power transmission; and a steering device that steers the front wheels and/or rear wheels. The front and rear lifting devices are configured such that when the front working machine is lowered to a working position in which it touches the ground, the rear working machine is raised to a non-working position in which it is lifted off the ground; The front wheel and rear wheel clutches are controlled so that when the rear working machine is raised to a non-working position lifted off the ground, the rear working machine is lowered to a working position where it touches the ground, and the front wheel and rear wheel clutches are arranged so that the front working machine is in a working position and the rear working machine is in a working position. When the front work equipment is in the non-working position, the power to the front wheels is cut off and the power is transmitted to the rear wheels, and when the front working equipment is in the non-working position and the rear working equipment is in the non-working position, the power is transmitted to the front wheels. It is characterized by being controlled so that power is transmitted to the rear wheels and power is cut off to the rear wheels.

(Function) In FIG. 1, in this example, the front working machine 27 is lifted up, the rear working machine 28 is lowered to the ground, and plowing work is performed toward the left in the figure.

In this case, at least the front wheels 2 are driven (the rear wheels 3 may also be driven), and the weight of the front working machine 27 is added to the front wheels 2 to obtain a large tractive force.

In Figure 1, the tractor is being driven forward, but
When driving backwards (to the right in FIG. 1), the clutch 37 in the drive system for the front wheels 2 is disengaged, the rear wheels 3 are switched to drive, and the front working machine 27 is lowered to the ground. , the rear working machine 28 will be lifted.

As the work progresses in the condition shown in Figure 1 and you reach the headland of the field, the front wheel 2 and the rear wheel 3 will appear as shown by the chain lines in Figure 2.
By steering the tractor to move forward and backward, you can move to the next work area without having to turn the tractor.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 denotes a tractor, which is equipped with a two-axle, four-wheel type traveling device 4 consisting of a pair of left and right front wheels 2 and a pair of left and right rear wheels 3.

Reference numeral 5 denotes a mounted engine, which is mounted on the front side of the tractor body 6 and covered with a bonnet 7.

The rotational power of the engine 5 is transmitted to the first transmission section 9 through the connection and disconnection of the main clutch 8.
The transmission can be transmitted to a second transmission section 14 having a traveling system transmission section 12 and a PTO transmission section 13 via the propeller shafts 10 and 11, respectively.

Both the front wheels 2 and the rear wheels 3 have lugs 2A and 3A, and both lugs 2A and 3A have a diagonal lug pattern, and as shown in FIG. 3, the lugs 2A hold dirt when driven forward. The lug 3A is a pattern that exerts traction force by holding in and discharging soil when the vehicle is driven in reverse, and the directions of the lugs 2A and 3A are reversed. There is.

Both the front wheel 2 and the rear wheel 3 have the same wheel diameter, and both are provided at both ends of the wheel so that they can rotate freely around the kingpin axis, and knuckle arms 15 and 16 are provided on the left and right kingpin axis sides, respectively.
The left and right knuckle arms 15 and 16 are connected by tie rods 20 and 21 having telescopic cylinders 18 and 19, respectively. Note that each cylinder 18, 19 is of a double acting type.

Reference numeral 22 denotes a control device, which includes at least a steering handle 23 and a driver's seat 24, which are provided on the tractor body 6 at a distance from the front and back, and other components (not shown) such as various clutch control levers and lifting/lowering of the work equipment. It is equipped with various levers such as a hydraulic control lever and a gear shift lever.

The steering handle 23 controls the telescopic cylinders 18 and 19, respectively, and has first and second control sections 25 and 26, as schematically shown in FIG. 3, to enable power steering.

Both the front wheels 2 and the rear wheels 3 can be independently steered around the king pin (including forward movement), and both the front wheels 2 and the rear wheels 3 can be turned in the same direction to rotate the wheels as shown by the chain lines in Fig. 2. It constitutes a club steering that moves back and forth in the direction.

27 is a front working machine, 28 is a rear working machine,
In this example, both are the same type of working machines exemplified as rotary tillers, and both have a power receiving shaft 27.
A, 28A, and the tilling parts 27B, 28B can be driven from the tractor PTO shaft.

In addition, it is desirable that each of the tilling parts 27B and 28B can be freely switched between forward and reverse directions.

The front and rear working machines 27 and 28 are mounted on the tractor body 6 in this example by mounting mechanisms 29 and 30 with two-point links so that they can be raised and lowered, and the front working machines 2
7 is raised and lowered by a lift cylinder 31, and the rear working machine 28 is raised and lowered by a lift arm 32.

The first transmission section 9 and the second transmission section 14 are provided with a forward/reverse switching mechanism to enable the tractor 1 to move forward or backward, and the traveling system transmission section 12 is connected to the rear wheel differential mechanism 33.
35 is a propeller shaft for driving the front wheels.

Clutches 36 and 37 are provided on the route to the rear wheel differential mechanism 33 and on the route to the front wheel differential mechanism 34, respectively.
7 can be freely connected and disconnected, and it is possible to drive either one of the front and rear wheels 2 and 3 or to drive both the front and rear wheels 2 and 3.

The PTO transmission section 13 is equipped with a rear PTO transmission section 38 and a front PTO transmission section 39 as output sides, and clutches 40 and 41 are provided on each output side, and the transmission sections 38 and 39 rotate at the same speed, respectively. 39 can be freely connected and disconnected.

That is, in this embodiment, the front work implement 27 is lifted, so the clutch 41 is disengaged, and the rear work implement 28 is lowered to the ground and in the working position, so the clutch 40 is disengaged. The plowing work is carried out in the plowing section 28B.

Next, the effects of the embodiment will be explained.

In the state shown in FIG. 1 in which the tractor 1 is moving forward to carry out work, the front working machine 27 is lifted and the clutch 41 is disengaged, so that its tilling section 27B is kept stationary, while the rear working machine 28 is placed on the ground. The plowing work is carried out at the plowing section 28B with the clutch 40 in contact.

At this time, at least the pair of left and right front wheels 2 are being driven in the forward direction, and since the front working machine 27 is lifted, its weight is added to the front wheels 2, making it possible to obtain a large tractive force.

In addition, since the lug 2A of the front wheel 2 is rotated in the direction of soil removal (jumping) while holding the soil, the amount of soil adhering to the front wheel 2 is reduced and a large traction force is obtained.

When the work progresses and the tractor 1 comes to the headland, it is necessary to move on to the next work step, but at this time, both the front work equipment 27 and the rear work equipment 28 are lifted up and the front wheels 2 and rear wheels 3 are removed. By moving the tractor 1 in both diagonal directions toward the same direction and moving the tractor 1 forward and backward, the tractor 1 can be moved to the next connecting/disconnecting process by club steering even if the tractor 1 is not turned.

When this transfer is completed, the front working machine 27 is lowered to the ground, the rear working machine 28 is kept raised, and the front working machine 27 is driven and the rear wheels 3 are switched to drive in the reverse direction. The work is done by driving backwards.

At this time, the front working machine 27 can reduce the uncultivated area and work up to the headland.

In the embodiments and operations described above, a rotary tiller is shown as the working machine, but both the front and rear can be used as a plow or a trencher.In short, the front and rear working machines 27 and 28 are of the same type. It is fine as long as it is something.

(Effects of the Invention) The present invention is as described above, and the tractor with a work machine according to the present invention drives at least the wheels on the lifted work machine side and adds the weight of the work machine to the drive wheels to generate a large traction force. It is possible to perform work with good soil removal performance and less soil adhesion, while still achieving a good soil removal performance.

In addition, either the front or rear wheels are driven, and the weight of the work equipment can be applied to these drive wheels, and work can be transferred without having to turn the tractor on headlands, which reduces unworked parts and improves efficiency. I can work.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an overall side view, FIG. 2 is a plan view, FIG. 3 is a schematic plan view showing the steering system, and FIG. 4 is a schematic plan view showing the transmission system. It is. 2, 3...Wheel, 2A, 3A...Lug, 4...
2-axle 4-wheel traveling device, 6... Tractor body, 2
7,28...Work machine.

Claims (1)

[Scope of Claims] 1. A tractor body consisting of an engine and a transmission case connected to the rear of the engine; Front wheels and rear wheels provided at the front and rear parts of the tractor body; a front connecting device and a rear connecting device pivotally connected to the front end and the rear end so as to be vertically swingable; ; A front working machine and a rear working machine of the same type are respectively connected to the front and rear connecting devices so that their work progress directions are opposite to each other; and a front working machine and a rear working machine of the same type are provided in the mission case and transmit the power of the engine. a forward/reverse switching mechanism that switches between forward and reverse; a front wheel transmission device and a rear wheel transmission device that transmit engine power from the forward/reverse switching mechanism to front wheels and rear wheels; a front wheel clutch that disconnects and connects the transmission of power; a rear wheel clutch that is installed in the rear wheel transmission device and disconnects and connects the transmission of power; a steering device that steers the front wheels and/or the rear wheels; The front and rear lifting devices are configured such that when the front working machine is lowered to a working position where it touches the ground, the rear working machine is raised to a non-working position where it is lifted off the ground; When the rear working machine is raised to a non-working position lifted off the ground, the rear working equipment is lowered to a working position where it touches the ground, and the front wheel and rear wheel clutches are controlled so that the front working equipment is in a working position when the front working equipment is in a working position. When the rear working machine is in a non-working position, power is cut off to the front wheels, and power is transmitted to the rear wheels, and when the front working machine is in a non-working position and the rear working machine is in a working position, the power is transmitted to the front wheels. transmits the power of
A tractor with a work implement, characterized in that it is equipped with a control means that is controlled to cut off power to the rear wheels.