JPS6410369B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine speed regulating device for a specially equipped vehicle.

(Prior Art) Generally, specially equipped vehicles are known that use an engine as a power source other than the driving power of the vehicle and operate a working machine via a power take-off device.In this case, the engine is idled to prevent the engine from stopping when the working machine is operating. The engine speed is increased to a higher speed than the engine speed, and the engine speed is now adjusted via the accelerator pedal when driving, and via the control lever when working. There is.

(Problems to be Solved by the Present Invention) By the way, in such specially equipped vehicles, when the accelerator pedal is pressed while working on a working machine, the engine speed is increased beyond the regulated engine speed during work, so the oil pressure is increased. In addition to the risk of damage due to overspeeding of the pump, there is also the problem that the working speed of the working machine increases beyond the specified limit, which poses a danger to the work.

The present invention has been made in view of the above points, and it is possible to prevent damage to the hydraulic pump by regulating the maximum engine rotation speed during work to be lower than the maximum engine rotation speed during driving without providing any links or the like. An object of the present invention is to provide an engine rotation speed regulating device for a specially equipped vehicle, which can prevent the speed of the machine from increasing beyond the specified limit.

(Means for Solving the Problems) The present invention provides a specially equipped vehicle that drives a working machine via a power take-off device, which includes a stopper for regulating the depression of an accelerator pedal, an actuator for operating the stopper, and a stopper for regulating the depression of an accelerator pedal. an electric contact that is switched and operated in connection with the contact operation of the power take-off device or in connection with the start operation of the working machine, and the stopper is actuated when the power take-off device is connected or the work machine is started. It is configured to operate at the pedal depression restriction position.

(Example) Examples of the present invention will be described below based on the drawings.

In FIG. 1, an accelerator pedal 2 is pivotally attached to a driver's cab 1 of a specially equipped vehicle V so as to be able to rotate up and down, and the rotation of the accelerator pedal 2 is controlled via an accelerator control link 3 (not shown) at the bottom of the accelerator pedal 2. The signal is transmitted to the engine speed adjustment device, and the engine speed is adjusted.

Reference numeral 4 denotes a rotary solenoid as an actuator, and as its name suggests, when it receives electrical energy and is energized to a solenoid (not shown), its output shaft rotates by a certain angle. The rotary solenoid 4 is attached to a stay 6 fixed to the driver's cab 1, and an arm 7 is integrally connected to the rotating shaft 5 of the rotary solenoid 4.
10 is a shaft 2 attached to a bracket 9 fixed to the driver's cab 1.
It is a stopper rotatably pivoted by 8,
A rod 8 is rotatably mounted between the stopper 10 and the arm 7 via shafts 26 and 27.

Therefore, when the rotary solenoid 4 is actuated, the arm 7 rotates by a certain angle, and as a result, the stopper 10 is rotated via the rod 8.

In FIG. 1, an operating lever 11 for connecting and disconnecting a power take-off device (not shown) is connected to a bracket 1 attached to a piston 15 fixed to the driver's cab 1.
3 is rotatably supported by a shaft 12, and its lower end is pivotally supported by a shaft 14 at one end of a rod 16 which is slidable back and forth within the piston 15.

On the other hand, an L-shaped bell crank 20 is rotatably mounted in a proper position in the driver's cab 1 via a shaft 18, and one end of the bell crank 20 is connected to the rod 16 by a shaft 17. The other end is connected by a shaft 19 to a rod 21 that is linked to a power take-off device (not shown).

Therefore, when the operating lever 11 is rotated, it is converted into a linear motion of the rod 16, and this linear motion can be used to disconnect or engage a power take-off device (not shown) via the bell crank 20. be.

By the way, an actuation switch 23, which is an electric contact, is attached to a stay 22 fixed to the driver's cab 1, facing the bell crank 20, and a lever 24 of the actuation switch 23 is activated by rotating the operating lever 11. It is adapted to come into contact with the crank 20 or to separate from the bell crank 20.

In the above configuration, when the vehicle is running, the operating lever 11 is in a position rotated to the left about the shaft 12 as shown in FIG. 1, and the power take-off device (not shown) is switched to the off position. At this time, the lever 24 of the operating switch 23 comes into contact with the bell crank 20 to maintain its contact in the disconnected state, and the rotary solenoid 4 and arm 7 are in the position shown in FIG.

As a result, the stopper 10 falls sideways, and the accelerator pedal 2 can be depressed to the maximum rotational speed allowed during driving.

Here, in order to operate the working machine, when the operating lever 11 is rotated clockwise around the shaft 12 to the position shown in FIG.
6 slides and indexes the shaft 17 to the left. At the same time, the bell crank 20 rotates clockwise about the shaft 18, so that the upper end of the bell crank 20 separates from the lever 24 of the operating switch 23.

As a result, the contacts of the actuating switch 23 are brought into contact, and the rotary solenoid 4 is energized.

Excitation of the rotary solenoid 4 causes the arm 7 to rotate clockwise via the rotating shaft 5, thereby pushing the rod 8 to the left. Therefore, the stopper 10 is rotated counterclockwise to stand up, and the accelerator pedal 2
Fixed at a position that regulates the amount of depression.

Furthermore, when the operation of the working machine is finished, if the operating lever 11 is rotated counterclockwise, the stopper 10 is automatically rotated clockwise in the reverse order to the above, and the accelerator pedal is not allowed to move when running. It becomes possible to press the engine up to its maximum rotational speed.

In the above embodiment, the rotation of the stopper 10 is driven by a rotary solenoid, but as shown in FIG. 3, it is also possible to drive it by an electric linear actuator 29, or a hydraulic actuator can also be used. .

Furthermore, although the operating switch is controlled to open and close in conjunction with the turning operation of the operating lever for connecting and disconnecting the power take-off device, it may also be linked to the operating switch 23' that loads and discharges garbage in a garbage collection vehicle, etc. It is possible.

(Effects) As described above, in the present invention, when the work machine is operated to drive, the actuator is automatically operated to regulate the amount of depression of the accelerator pedal, so that the engine speed is adjusted to the speed required for the work. There is no possibility of speed increase.

Therefore, the hydraulic pump is prevented from over-rotating and being damaged, and the working machine is not operated at a speed higher than the set speed, so the work can be carried out safely.

Additionally, unnecessary levers, links, etc. for adjusting the engine speed are eliminated, and the mechanism as a whole has the advantage of being simplified.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the invention.
The figure is a side view showing the relative positions of the rotary solenoid, power take-off device operating lever, etc. during driving.
The figure is a side view showing the relative positions of the rotary solenoid, the control lever of the power take-off device, etc. when the work machine is in operation, FIG. 3 is a side view showing the relative positions when the work machine is in operation in another embodiment, and FIG. It is a side view of a specially equipped vehicle. 1...driver's seat, 2...accelerator pedal, 4...
Rotary solenoid, 10...stopper, 11...
...operation lever, 23...operation switch.

Claims (1)

[Claims] 1. In a specially equipped vehicle that drives a working machine via a power take-off device, a stopper that restricts the depression operation of the accelerator pedal, an actuator that activates the stopper, and a stopper that controls the operation of the accelerator pedal, and a stopper that controls the operation of the power take-off device or the work machine and an electric contact that is switched in connection with the starting operation of the machine, and the stopper is configured to operate to the accelerator pedal depression restriction position when the power take-off device is engaged or when the working machine is started. Features: Engine speed regulation device for specially equipped vehicles.