JPH022Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a work equipment elevating device for a forward-reverse type vehicle, and is configured to automatically raise the rear work equipment when traveling in reverse.

2. Description of the Related Art There is a vehicle such as a forward-reverse type tractor that is capable of changing the driving position forward or backward by reversing the main parts such as a driver's seat and a steering wheel, and is equipped with a forward-reverse switching device in the power transmission system. In this type of vehicle, the forward/backward switching device is designed to switch to run in the direction of operation by simply operating the switching lever back and forth, making it extremely difficult to perform work while frequently moving back and forth. It is convenient for However, because it is easy to operate, the switching lever may be operated inadvertently to the reverse side.Therefore, if the work equipment installed at the rear remains in the lowered position, there is a risk of damaging the work equipment. It was hot.

The present invention was provided with the aim of solving these conventional problems, and its features include the ability to attach the work equipment to at least one of the front and back, and the ability to adjust the operating position of the operator. A forward/reverse type vehicle that is capable of reversing the front/backward direction and is equipped with a forward/reverse switching device is equipped with a switch for detecting the operator's driving posture and a switch for detecting the operation position of the switching lever of the forward/reverse switching device, A control circuit is provided which raises the rear working machine when the switching lever is operated in the backward direction by the operator.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIG. 1, reference numeral 1 denotes a tractor body, which includes a transmission case 2 and the like, and has front wheels 3 and rear wheels 4. 5 is a bonnet, 6 is a rear bonnet, and has a cover 7 that can be opened and closed. Reference numeral 8 denotes a rear hydraulic system, which is mounted at the rear of the tractor body 1 and has a pair of left and right lift arms 10. Reference numeral 11 is a driver's seat, and reference numeral 12 is a handle, which can be attached and detached by flipping them back and forth to the respective attachment points near the rear bonnet 6 and near the rear hydraulic system 8. By reversing the installation, the operator's driving posture can be changed back and forth. It is possible. Reference numeral 13 indicates a rear wheel fender, and reference numeral 14 indicates a side door, which is pivotally supported on one side so as to be openable and closable, and a switching lever 15 for forward and backward movement is pivotally supported on this side door 14 so as to be operable in the front and rear directions. . Reference numeral 16 denotes a rear-mounted three-point link mechanism for attaching a working machine, for example, a rotary 17 to the rear of the tractor body 1;
and lower link 19, and the lower link 1
9 connects the lift arm 10 via the lift rod 20
is connected to. Reference numeral 21 denotes a front-mounted three-point link mechanism for attaching a work implement to the front of the tractor body 1, and includes a top link 23 and a lower link 24 that are pivotally supported on a support frame 22, and the lower link 24 is lifted via a lift rod 25. connected to the arm 26;
The lift arm 26 is pivotally connected to the upper end of the support frame 22 and can be raised and lowered by a front hydraulic device 27.

Figure 2 shows the power transmission system, 28 is the engine,
29 is a clutch. 30 is a traveling main transmission;
31 is a travel sub-transmission device, 32 is a differential device, 33 is a
With PTO transmission, these are transmission case 2
It is contained within. A forward/reverse switching device 34 is provided within the main transmission 30, and the forward/reverse switching device 34 is configured to have approximately the same speed in both forward and reverse directions, and can be switched by sliding the shifter 35 forward and backward. ing. The shifter 35 is the switching lever 15
linked to. The differential device 32 is linked to the rear wheels 4 via a speed reduction mechanism 36.

In FIG. 3, 37 is a forward detection switch;
Reference numeral 8 denotes a backward detection switch, which detects the operator's driving posture and is configured to be turned on when the operator is seated in the driver's seat 11. 39 is the first
The front/backward detection switch 40 is a second front/back detecting switch, which is a switch for detecting the operation position of the switching lever 15, and is configured to be turned on when the switching lever 15 is operated forward or backward. 41 is the first
A rise detection switch 42 is a second rise detection switch, which detects the rise of the working machine via the lift arms 10 and 26. 43 and 44 are electromagnetic valves, 45 is a control circuit, 46 is an automatic release switch, and 47 is a manual switch.

Next, the operation of the above configuration will be explained. The solid line in FIG. 1 shows a state in which the driver's seat 11 and the handlebar 12 are mounted in a forward driving position, and the rotary 17 is mounted at the rear of the tractor body 1 via the rear three-point link mechanism 16. At this time, since the driver's seat 11 is in the forward facing position, the forward detection switch 37 is turned on, and since the rotary 17 is in the lowered position, the upward detection switch 41 is turned off. Therefore,
Now, when the switching lever 15 is operated forward as shown by arrow a, the forward/reverse switching device 34 switches to forward and moves forward, and the second forward/backward detection switch 40 is turned on, but at this time, the backward detection switch 38 is turned off. Therefore, the hydraulic device 27 does not operate at all. Next, when the switching lever 15 is operated rearward as shown by arrow b, the forward/reverse switching device 34 is switched to reverse, and the vehicle moves backward. On the other hand, the first longitudinal detection switch 39 is turned on by the switching lever 15, and the signal is input to the control circuit 45 together with the signal from the forward detection switch 37.
issues a command to ascend. Therefore, the solenoid valve 43 operates in the upward direction, and the hydraulic device 8 operates upward to lift the rotary 17. Therefore, there is no fear that the cover of the rotary 17 will be damaged or the rotary 17 will disturb the plow marks due to backward movement. Then, when the rotary 17 rises, the first rise detection switch 41 is turned on, a stop signal is input to the control circuit 45, and the solenoid valve 43 returns to neutral. When the switching lever 15 is operated in the direction of arrow b in this way, the driver's seat 1
The rotary 17 on the rear side of 1 automatically rises to a predetermined position and stops, but after that, the control circuit 45 is configured not to issue a descending command until a descending switch (not shown) is manually pressed. However, if you want to continue rotary work, operate the switching lever 15 to the forward side again and switch the second front/rear detection switch 40.
This second front/rear detection switch 40
It is desirable that the control circuit 45 issues a lowering command when the switch is turned on. If the working machine is not lifted even when the switching lever 15 is operated in the direction of arrow b, the automatic release switch 46 can be pressed to disable the control circuit 45.

When the driver's seat 11 and the steering wheel 12 are installed in the rearward driving position as shown in the imaginary line in Fig. 1, the operation is completely opposite to that described above, and when the switching lever 15 is operated in the direction of the arrow a, the front three points The working machine attached via the link mechanism 20 will rise.

In the above embodiment, the rear three-point link mechanism 16
In addition, although a tractor equipped with a front-mounted three-point linkage mechanism 20 has been illustrated, the same applies even if only one of them is used, and a two-point linkage mechanism can also be implemented in the same manner. Further, as the interlocking means for raising the working machine in conjunction with the switching lever 15, it is also possible to employ mechanical means, hydraulic means, etc. in addition to the electrical means of the embodiment.

In the present invention, when the switching lever of the forward/reverse switching device is operated in the backward direction relative to the operator, the work equipment on the rear side relative to the operator is raised, regardless of the operator's driving posture. Even though the position can be reversed forward and backward and it is equipped with a forward/reverse switching device, damage to the work equipment can be prevented even in the event of careless reversing, and safety during operation is significantly improved.

[Brief explanation of the drawing]

The drawings illustrate one embodiment of the present invention; FIG. 1 is a side view, FIG. 2 is a configuration diagram of a power transmission system, and FIG. 3 is a configuration diagram of a control system. 1... Tractor body, 11... Driver's seat, 12...
...Handle, 15...Switching lever, 16...Rear three-point link mechanism, 17...Rotary, 20...Front three-point link mechanism, 34...Forward/forward switching device, 4
5...Control circuit.

Claims (1)

[Scope of utility model registration request] In a forward-reverse vehicle that is capable of attaching a work implement to at least one of the front and rear, that allows the operator's driving position to be reversed forward and backward, and that is equipped with a forward-reverse switching device, a switch for detecting the operator's driving position and a switch for switching forward-reverse travel are provided. A switch is provided to detect the operation position of the switching lever of the device, and signals from both detection switches cause the switching lever to indicate to the operator,
A work machine lifting device for a forward-reverse type vehicle, characterized in that it is provided with a control circuit that raises a rear work machine when the work machine is operated in the reverse direction.