JP3145036B2 - Work vehicle counterweight - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a working vehicle such as a wheel loader used for various construction works and civil works.

[0002]

2. Description of the Related Art In general, some of such working vehicles include:
For example, there is a configuration in which a work attachment such as a bucket is attached to a front portion of the fuselage and excavation of soil and the like is performed using the work attachment, and work such as transportation is performed.
In such a case, the work load is applied to the front side of the body. Therefore, conventionally, a counterweight is provided at the rear part of the fuselage, and the counterweight is used to balance the front and rear of the fuselage during operation.

[0003]

However, since the conventional counterweight is fixed to the rear part of the machine body, when the vehicle is not subjected to a work load or the like, the weight of the counterweight causes the machine weight center to be rearward. There is a problem that running stability is impaired, and there is a problem to be solved by the present invention.

[0004]

The present invention SUMMARY OF] In view of the above-mentioned circumstances, be one that is created for the purpose of solving these problems, the first invention is set to work vehicles
The tank that can store the fluid using a counterweight that can be used as a fluid and a tank that is located on the vehicle center side,
And a transfer means for transferring a fluid between the tanks, the transfer means comprising a pipe connecting between the tanks,
Is driven by a control command output from the control unit to transfer the
When configured with a pump, the control unit creates a fluid.
To transfer to the tank on the opposite side of the industrial attachment
A work mode that outputs control commands to the pump can be selected.
This is a counterweight of a working vehicle characterized by having the following configuration . The second invention is provided in a work vehicle.
The tank that can store the fluid with the counter weight that is used as a fluid is provided with a tank arranged on the vehicle center side,
A tank arranged on the opposite side to the attachment, and a transfer means for transferring fluid between these tanks is provided,
The transfer means is connected to a pipe connecting between the tanks and a fluid.
A pump driven by a control command output from the control unit to send
When the control unit is configured with the
Output a control command to the pump to transfer it to the tank
And a counterweight of the working vehicle, wherein the counterweight is configured to be capable of selecting a traveling mode . A third invention uses a counterweight provided in a work vehicle as a fluid, and a tank capable of storing the fluid is provided at a vehicle center.
Tank on the side and the side opposite to the work attachment
Transfer means for transferring fluid between these tanks, and the transfer means is provided between each tank.
And the output from the control unit to transfer the fluid.
And the pump driven by the control command
The control unit controls the traveling speed to exceed a preset speed.
And if it is determined that it is exceeded
Transfer the fluid to the center side tank and
If it is determined that there is a fluid, attach it to the work attachment
Control command to the pump to transfer to the tank on the opposite side
A counterweight of a working vehicle, wherein an automatic mode for outputting is selectable . A fourth invention uses a counterweight provided in a working vehicle as a fluid, and a tank capable of storing the fluid is provided in a vehicle.
The tank arranged on the center side and the work attachment
Is a tank disposed on the opposite side, the transfer means for the fluid transfer of between these tanks is provided, the said transfer means, each
The piping connecting the tanks and the control unit to transfer the fluid
With a pump driven by a control command output from the
In this case, the control unit is configured to transfer the fluid to a work attachment.
Issues a control command to the pump to transfer to the opposite tank.
Working mode and fluid transfer to the center tank.
A driving mode in which a control command is output to the pump
Judge whether the line speed exceeds the preset speed
And if determined to be above
Transfer to the side tank and it is judged that the speed is lower than the set speed
If not, transfer the fluid to the tank on the opposite side of the work attachment
Automatic mode that outputs control commands to the pump to transfer to
Is set, and one of these modes can be arbitrarily selected.
A counterweight for a working vehicle, wherein the counterweight is configured to be able to be switched . By doing so, the fluid is transferred in accordance with the work load applied to the work vehicle, so that the machine body can be moved during the work in which the work load is applied and in the non-working state where the work load is not applied. Good balance can be obtained, and excellent stability can be obtained.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling body of a wheel loader, and a bucket 3 is attached to a front portion of the traveling body 1 via a lift arm 2 so as to be vertically swingable. The basic configuration, such as that it is configured to perform operations such as excavation and transportation, etc., is the same as the conventional one.

Reference numeral 4 denotes a counterweight provided on the traveling machine body 1. The counterweight 4 is composed of a fluid such as oil, and the counterweight 4 is stored in a tank 5 described later.

In the present embodiment, the tank 5 is provided at the center bottom of the fuselage (preferably a portion located below the center of gravity of the machine when no work such as excavation or transportation is performed). A side tank 5S and a rear tank 5R installed on the rear bottom of the fuselage are provided. These tanks 5S and 5R are connected by a pipe 6, and the counterweight 4 made of the fluid is It is possible to move between these tanks 5S and 5R based on the drive of an electric pump (or a hydraulic pump).

On the other hand, reference numeral 8 denotes a mode switch for the counterweight provided in the cockpit section 9, and the mode switch 8 includes a "running mode", a "working mode",
Any one of the “auto mode” can be selected. The signal of the mode switch 8 is
0 is input.

The control unit 10 is composed of a microcomputer or the like. The control unit 10 includes the mode switch 8, the shift lever 11 and the shift switch 12, which are operated to change the speed ratio of the running, and the running switch. A shift valve 15 for inputting signals from various switch means, lever means, and sensor means such as a speed sensor 13 for measuring the speed and performing gear switching of the electric pump 7 and the transmission 14 based on the input signals. And so on.

Next, the control procedure of the counter weight 4 in the control unit 10 will be described. When the system is started and initialization is performed, the control unit 10 first determines which mode the mode switch 8 is set to. Judge. Here, when the “running mode” is selected, the control unit 10 outputs a control command to the electric pump 7 to transfer the counterweight 4 to the center-side tank 5S. The output of the control command is stopped by detecting that the transfer to the center side tank 5S has been completed by a limit switch or the like.

The mode switch 8 is set to the "work mode".
Is selected, the control unit 10 controls the electric pump 7
And outputs a control command to transfer the counterweight 4 to the rear tank 5R. The output of this control command is
The operation is stopped by detecting that the transfer to the rear tank 5R has been completed by a limit switch or the like.

On the other hand, the mode switch 8 is set to the "auto mode".
Is selected, the control unit 10 subsequently determines whether or not the traveling speed V input from the speed sensor 13 exceeds a preset speed Vs (for example, 12 km / hr). When it is determined that the speed exceeds the set speed Vs (V> Vs), the control unit 10 determines that the wheel loader is traveling in a non-working state, and the “traveling mode” is selected. In the same manner as in the case in which the counterweight 4 is transferred to the center side tank 5S, the control command is output to the electric pump 7. When it is determined that the traveling speed V is equal to or lower than the set speed Vs (V ≦ Vs), the control unit 10 determines that the wheel loader is in the working state, and is set to the “working mode”. As in the case, a control command is output to the electric pump 7 to transfer the counterweight 4 to the rear tank 5R. The control unit 10 also performs traveling speed change control for outputting a control command to the speed change valve 15 based on input signals from the speed change lever 11, the speed change switch 12, and the speed sensor 13, but this control is not described here. Will be omitted.

In the vehicle constructed as described above, the counterweight 4 is made of a fluid, and the traveling body 1 has a tank 5 for storing the counterweight 4 therein.
S and 5R are provided at two places, the center part and the rear part of the fuselage.
The transfer between S and 5R can be performed by driving the electric pump 7.

As a result, when a work load is applied to the front of the fuselage, such as when excavating or carrying out work using the bucket 3, the counterweight 4 is stored in the rear tank 5R at the rear of the fuselage. Thus, the balance between the front and rear of the fuselage at the time of work can be ensured. On the other hand, when the work load is not applied to the front of the fuselage, the counterweight 4 is stored in the center tank 5S at the center of the fuselage. By doing so, stability during traveling can be ensured, and excellent stability can be obtained in both cases of work and traveling.

Further, in the present embodiment, by setting the mode switch 8 to the "automatic mode", the control unit 10 is operating according to the traveling speed or traveling during the non-operation state. Is determined, the transfer of the counterweight 4 is automatically performed. When the traveling and the work are repeatedly performed, it is necessary to perform a switch operation for transferring the counterweight 4 each time. And contribute to improvement of workability.

It should be noted that the present invention is not limited to the above-described embodiment, and the "automatic mode"
The transfer control of the counterweight 4 in the above can be performed not by the running speed but by the running speed.
For example, for the traveling speed change, a high speed (0 to 35 km / h
r), medium to high speed (0 to 20 km / hr), medium to low speed (0 to 1 km)
2 km / hr) and a low speed (0-7 km / hr) automatic transmission mode, and when the high speed and the middle / low speed automatic transmission are selected, it is determined that the vehicle is traveling in a non-working state. Assuming that the counterweight 4 is transferred to the center-side tank 5S, and that the counterweight 4 is transferred to the rear-side tank 5R assuming that the work is in the working state when the medium-speed and low-speed automatic shifting is selected. You may.

Further, in the present embodiment, the tanks are provided at two places, that is, the center part of the body and the rear part of the body. However, the present invention is not limited to this, and the tanks are provided at appropriate positions corresponding to the respective work vehicles. For example, although the rear frame of the wheel loader has a box-shaped structure, the front frame and the rear tank may be formed by partitioning the rear frame back and forth. In addition, three or more tanks may be provided, and furthermore, when transferring the counterweight, only a part of the counterweight can be transferred, and the amount of the counterweight stored in each tank is transferred to the work vehicle. It is also possible to configure so as to distribute in accordance with the load.

[Brief description of the drawings]

FIG. 1 is a side view of a wheel loader.

FIG. 2 is a block diagram illustrating input and output of a control unit.

FIG. 3 is a flowchart illustrating transfer control of a counterweight.

[Explanation of symbols]

 4 Counterweight 5S Center side tank 5R Rear side tank 6 Piping 7 Electric pump 8 Mode switch 10 Control unit 13 Speed sensor

Claims (4)

(57) [Claims] A counterweight provided in a work vehicle is used as a fluid, and a tank capable of storing the fluid is mounted on a vehicle center.
Tank and the work attachment are opposite
And a transfer means for transferring fluid between the tanks, and the transfer means is provided for each tank.
Pipes connecting the pipes and the control section to transfer fluid.
And a pump driven by a control command
The controller controls the fluid to flow in the opposite direction to the working attachment.
Output a control command to the pump to transfer to the side tank
A counterweight for a working vehicle, wherein the counterweight is configured to select a working mode . 2. The vehicle according to claim 1, wherein a counterweight provided in the working vehicle is used as a fluid, and a tank capable of storing the fluid is provided as a vehicle sensor.
Tank and the work attachment are opposite
And a transfer means for transferring fluid between the tanks, and the transfer means is provided for each tank.
Pipes connecting the pipes and the control section to transfer fluid.
And a pump driven by a control command
The control unit transfers the fluid to the center side tank.
Run mode to output control command to pump
A counterweight for a working vehicle, characterized in that the counterweight is configured to be capable of being operated. 3. A counterweight provided in a work vehicle is used as a fluid, and a tank capable of storing the fluid is used as a vehicle sensor.
Tank and the work attachment are opposite
And a transfer means for transferring fluid between the tanks, and the transfer means is provided for each tank.
Pipes connecting the pipes and the control section to transfer fluid.
And a pump driven by a control command
In addition, the control unit is configured to set a traveling speed at a preset speed.
Is determined to be over, and if it is determined to be over
Transfer the fluid to the center tank,
If it is determined to be below, attach the fluid to the work attachment
Control finger to pump to transfer to tank opposite to
It is configured so that the automatic mode that outputs the command can be selected
Counterweight of the working vehicle, characterized in that there. 4. A vehicle in which a counterweight provided in a work vehicle is used as a fluid and a tank capable of storing the fluid is provided as a vehicle sensor.
A tank arranged to terpolymers side, contrary to the working Atatchime cement
And a transfer means for transferring fluid between the tanks, and the transfer means is provided for each tank.
Pipes connecting the pipes and the control section to transfer fluid.
And a pump driven by a control command
The controller controls the fluid to flow in the opposite direction to the working attachment.
Output a control command to the pump to transfer to the side tank
Work mode and transfer fluid to the center tank
Mode to output a control command to the pump and the running speed
Judgment whether the speed exceeds the preset speed
If it is determined that the fluid has exceeded the
Transfer to the tank, and if it is determined that the speed is
Fluid to the tank on the opposite side of the work attachment
Automatic mode to output control command to pump to transfer
Is set, and one of these modes can be selected arbitrarily
A work vehicle counterweight characterized in that it can be switched .