JPS6129205Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a system in which a working machine, such as a rotary tiller, is connected to a traveling work vehicle via a three-point link so that it can be raised and lowered and rolled. The present invention relates to the provision of an apparatus that can be lifted in a so-called restored state in which the posture is corrected or corrected to a horizontal plane (level plane).

A traveling work vehicle, such as one in which a work machine is connected to a tractor via a three-point link so that it can be raised and lowered and rolled freely, has the advantage of ensuring a uniform working height and depth even on sloped or uneven ground. There is.

However, when lifting a work equipment that is tilted relative to the traveling work vehicle, for example when turning, the work equipment will be raised in an inclined position, so if the work equipment is a drive type, The interlocking shaft with a so-called universal joint becomes inconstant, which causes noise, and lift balance, especially in the width direction of the vehicle, is disrupted, which is undesirable, and furthermore, the lift amount (ground clearance) becomes extremely low. There is a problem.

The present invention has been devised in view of the above points, and one embodiment thereof will be described in detail below with reference to the drawings.

In FIGS. 1 to 3, 1 is a traveling work vehicle shown as a tractor, 2 is a work machine shown as a rotary tiller, and 3 is a three-point link, which allows the work machine 2 to be moved up and down with respect to the traveling work vehicle 1. It is connected so that it can be rolled freely.

A hydraulic lifting device 4 is mounted on the vehicle body and has a pair of left and right lift arms 5.

The three-point link 3 is a top link 6 that can be freely extended and fixed.
One end of the top link 6 is detachably pivoted via a pin 9 to a mounting body 8 detachably provided on the traveling work vehicle 1, and the other end is detachably pivoted via a pin 10 to the machine frame of the work machine 2. The lower links 7 are each attached to the lower sides of the vehicle body via pins 11.
The other ends of the links are pivotally supported on the frame of the working machine 2 via pins 12, and the pivotal portions of the above-mentioned links have a so-called ball joint structure.

Reference numeral 13 denotes an elevating connection body, which connects each lift arm 4 and each lower link 7 midway, and one or both of the elevating connection bodies 13 is made into a telescoping cylinder 14, so that the cylinder 14 can be expanded and contracted. As a result of the operation, the work implement 2 is able to roll freely relative to the traveling work vehicle 1 as shown in FIG.

In addition, 15 is an interlocking shaft with a universal joint 16,
When the work equipment 2 is a drive type, it connects the PTO shaft and the receiving shaft, and when the work equipment 2 is a non-drive type,
For example, it can be removed when using a plow.

Reference numeral 17 denotes a displacement sensing body, and in this embodiment, as particularly illustrated in FIGS. It consists of a pair of inverted L-shaped lenses, and has a cam portion 19 on the upper surface of the displacement sensing body 17 tapering forward as shown in FIG. It constitutes a substantial sensing part for displacement on the surface. Note that the pair of displacement sensing bodies 17 tilt (rotate) around the horizontal axis 18, but the biasing body 2, which is represented by a helical spring, for example,
0, it is biased in the closing direction. Note that the biasing body 2
0 may be a leaf spring.

21 is a detector, which is essentially a telescopic cylinder 1
The control valve (not shown) operates the expansion/contraction behavior operation function of 4.
That is, it is operatively connected to the telescopic cylinder 14 via the control valve of the telescopic cylinder 14. This detector 21 responds to the pair of sensing bodies 17, is provided on the top link mounting body 8, and is desirably detachable.

In the above embodiment, in order to roll the work implement 2 relative to the traveling work vehicle 1, the telescopic cylinder 14 is automatically controlled and rolled, and thereby the work vehicle 1 and the work implement 2 are rolled relative to each other. The work can be continued while changing the position, and the work depth can be done evenly even on sloped or uneven ground.

For example, in order to turn the work vehicle 1 on the headland of a field, the lifting device 4 is activated to raise the lift arm 5, and the work machine 1 is moved through the three-point link 3.
will be lifted up, but at this time, work vehicle 1
Since the relative position of work equipment 2 is inclined,
The work implement 2 will be elevated in the same posture. In such a case, the top link 6 is displaced in the vertical plane as shown in FIG. Hit sensor 17
A force acts to rotate the sensor around the horizontal axis 18 against the biasing body 20, which activates one of the detectors 21 and causes the telescopic cylinder 14 to expand or contract via a control valve (not shown). Here, the work equipment 2 is lifted up in a horizontal position, that is, in a balanced position with respect to the work vehicle 1, and here the interlocking shaft 15 is prevented from rotating at an uneven speed, and the vehicle is balanced in the width direction. You can ascend in a stable position.

After turning, the working machine 2 is returned to its previous position by a feedback device (not shown, provided in connection with the cylinder device 14, for example) or a control valve, and enters the working position.

Note that when the sensing body 17 is on flat ground, the top link 6 is not displaced, so the sensing body 17 can be raised and lowered in the same way as in normal work.

This invention has a top link 6 for a traveling work vehicle 1.
and a lower link 7, in which the work implement 2 is connected to the lift arm 5 of the lifting device 4 provided on the traveling work vehicle 1 and the three-point link 3 so as to be able to move up and down and roll freely. The lower link 7 is connected with the telescopic cylinder 14, and the top link mounting body 8 provided on the traveling work vehicle 1 side detects the horizontal deviation of the top link 6 with respect to the vertical plane when the work equipment 2 is raised. The top link mounting body 8 is further provided with a detector 2 that responds to the displacement sensor 17.
1, and the detector 21 and the telescopic cylinder 14 are interlocked and connected in order to correct the work machine 2 to a horizontal position. 2 is lifted up in a tilted position, the sensor 17 detects the displacement via the top link 6, and the detector 21 moves the telescopic cylinder 14 to restore the horizontal position. When the drive type work equipment 2 is used, it is possible to raise the work equipment 2 by improving the balance in the vehicle width direction while reducing the noise factor, and when using the non-drive type work equipment 2, it is possible to improve the balance and increase the ground clearance. It has the advantage of being able to be made large in size, and therefore can be lifted without any problem even with a rolling type work machine. It is clear that the present invention is also applicable to muzzleloading work machines.

[Brief explanation of the drawing]

Figure 1 is a side view of an example of the proposal, Figure 2 is a plan view,
FIG. 3 is a rear view, FIG. 4 is a side view of essential parts, FIG. 5 is a rear view, and FIG. 6 is a plan view. 1... Traveling work vehicle, 2... Work equipment, 3... Three-point link, 4... Lifting device, 5... Wrist arm, 6... Top link, 7... Lower link,
8... Top link attachment body, 14... Telescopic cylinder, 17... Displacement sensor, 21... Detector.

Claims (1)

[Scope of utility model registration request] A lifting device 4 provided on the traveling work vehicle 1 in which a work implement 2 is connected to the traveling work vehicle 1 via a three-point link 3 having a top link 6 and a lower link 7 so as to be able to move up and down and roll freely.
The wrist arm 5 and the lower link 7 of the three-point link 3 are connected by a telescopic cylinder 14, and a top link mounting body 8 provided on the side of the traveling work vehicle 1 is connected to the lower link 7 of the three-point link 3.
A displacement sensor 17 is provided for detecting the horizontal deviation of the top link 6 with respect to the vertical plane when the work machine 2 is raised, and the top link mounting body 8 is further provided with a
Restoration of a rolling type work machine coupling device characterized in that a detector 21 responsive to the displacement sensing body 17 is provided, and the detector 21 and the telescopic cylinder 14 are interlocked and connected to correct the work machine 2 to a horizontal posture. Device.