JPH0447217Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a vehicle speed synchronization device for a liquid spraying vehicle that synchronizes the spraying amount of the spraying vehicle with the vehicle speed to ensure the amount of spraying per unit area.

[Prior art and its problems] Generally, when spraying water or anti-freezing liquid on a road, the water pump is either driven through the vehicle's engine transmission or is driven by a separate independent engine. There are cases where

If the engine transmission is used, the amount of spraying may change significantly depending on the speed of the vehicle.

In addition, when using an independent engine, in order to keep the spray amount per unit area constant, the independent engine's rotational speed acceleration/deceleration lever must be manually operated frequently to adjust the spray amount according to the vehicle speed. Nakatsuta.

[Purpose of the invention] In view of the above-mentioned points, it is an object of the present invention to provide a vehicle speed synchronization device for a liquid spraying vehicle that effectively solves the problems of the prior art, has a simple configuration, and can improve the spraying performance. With the goal.

[Main points of the invention] In order to achieve these objectives, the invention has the following points:
A power take-off device that extracts power from an engine flywheel of a vehicle body traveling system, a variable displacement hydraulic pump connected to the power take-off device and driven to rotate, and a hydraulic motor whose rotation speed is made variable depending on the amount of oil discharged from the hydraulic pump. , a liquid spray pump connected to the hydraulic motor and rotationally driven; a vehicle speed detection means for detecting the vehicle speed of the vehicle body traveling device from a speedometer rotating cable; and a vehicle speed detecting means for detecting the rotation speed of the hydraulic motor or the liquid liquid pump. Controlling the oil discharge amount of the hydraulic pump so that the sprinkler discharge amount of the sprinkler pump is synchronized with the vehicle speed based on the outputs of the sprinkler pump rotational speed detection means, the vehicle speed detector, and the sprinkler pump rotational speed detector. The invention is characterized by comprising a liquid spray amount control means.

[Embodiment of the invention] An embodiment of the invention will be described in detail based on the drawings.

FIG. 1 shows a schematic diagram of a liquid spraying vehicle to which the present invention is applied.

In the figure, a liquid spray vehicle 1 is equipped with a chassis 2, a driver's cab 3 at the front end of the chassis 2, and a spray storage tank 4 at the rear.

A variable displacement hydraulic pump 9 is mounted on a flange 7 of a power take-off device (PTO) from a flywheel 6 of a vehicle engine 5, which will be described later in FIG. 2, via a drive shaft 8.

This hydraulic pump 9 is connected to the hydraulic motor 1 by an oil guide pipe.
Concatenated to 0.

The hydraulic motor 10 rotates the spray pump 11, and transfers water, chemical liquid, etc. stored in the spray storage tank 4 to the spray nozzle 13A through the switching valve 34.
Spread more on the road surface.

Next, FIG. 2 shows a block diagram of an embodiment of the present invention.

In the figure, parts having the same functions as those in FIG. 1 are given the same reference numerals.

The vehicle speed synchronization device 14 of the liquid dispersion vehicle 1 includes a hydraulic pump 9, a hydraulic motor 10, a liquid spray pump 11, a vehicle speed detection means, and in this embodiment a speed sensor 12,
The dispersion pump rotation speed detection means, in this embodiment, a speed sensor 13, the spray amount control means, in this embodiment, includes a hydraulic pump discharge amount control device 30, an abnormality detection alarm device 15, and the like.

Of these, the hydraulic pump 9 is a variable displacement swash plate type axial piston pump in this embodiment, as shown in FIG.

This hydraulic pump 9 is connected to a flange 7 of a flywheel 6 mounted on the vehicle engine 5 via a drive shaft 8 as shown in FIG. 4, so that the power of the vehicle engine 5 is smoothly transmitted.

By the way, this hydraulic pump 9 is movable left and right inside the cylinder block 18 by rotation of the input shaft 9A while the tips of the plurality of pistons 16 are in contact with the swash plate 17.

This amount of movement increases or decreases depending on the inclination angle a of the swash plate 17, thereby increasing or decreasing the amount of oil discharged to the hydraulic motor 10. Therefore, the number of rotations of the hydraulic motor 10 increases or decreases due to an increase or decrease in the amount of oil discharged.

In this embodiment, the hydraulic motor 10 is a constant displacement swash plate type axial piston motor, which is composed of a cylinder block and a plurality of pistons similar to the hydraulic pump 9, but the inclination angle of the swash plate 19 is fixed.

In this way, with the combination of the variable displacement hydraulic pump 9 and the fixed displacement hydraulic motor 10, the output side of the hydraulic motor 10 can be controlled by controlling the inclination angle a of the swash plate 17 with respect to the input side of the hydraulic pump 9. , continuous continuously variable speed is easily achieved.

Note that the speed sensor 12 is connected to the vehicle engine 5.
This sensor detects the vehicle speed from the speedometer rotating cable taken out from the transmission 20 of the vehicle.

Therefore, this sensor 12 and the hydraulic motor 10 or the liquid spray pump 11, in this embodiment, the hydraulic motor 10.
By comparing with the rotation speed detection speed sensor 13 attached to the hydraulic pump discharge amount control device 30
transmits an electrical signal to the electrical operating mechanism 21.

This electrical signal causes the operating mechanism 21 to control the swash plate 17.
The inclination angle a is controlled.

That is, when the vehicle speed increases and the spray amount per unit area decreases, by increasing the oil discharge amount of the hydraulic pump 9, the rotation speed of the hydraulic motor 10 is increased, and the spray amount of the spray pump 11 is automatically adjusted. increase.

Next, FIG. 5 shows a schematic configuration diagram of an instrument panel installed in the driver's cab.

In the figure, the instrument panel 22 includes a power switch 2
3. Power indicator lamp 24, rotation speed changeover switch 25 for the liquid spray pump 11, fine adjustment dial 26 for the rotation speed of the liquid spray pump 11, automatic manual changeover switch 27,
Manual operation dial 28 and error indicator lamp 29
etc. are arranged.

The rotation speed changeover switch 25 is set to the line A shown in FIG.
The rotation ratio of the liquid spray pump 11 relative to the vehicle speed can be changed as shown in diagram B.

Further, based on the relationship diagrams A and B between the rotation speed of the liquid spray pump 11 and the vehicle running speed, the liquid spray pump rotation fine adjustment dial 26 is set to, for example, 1.2 times,
It has a fine adjustment function for the rotation speed in three stages, for example, about 1.3 times and 1.4 times.

The rotation speed of this liquid spray pump 11 is an automatic type that is automatically controlled proportionally to the traveling speed of the vehicle, and the automatic/manual changeover switch 27 switches it to manual operation, and the manual operation dial 28 controls the liquid spray pump 11. It is also possible to manually control the rotation speed of the pump 11 within a range of approximately 700 rpm to 2000 rpm. Furthermore, when switching to the automatic type and using it, if some abnormality occurs and the rotation speed of the sprinkler pump 11 deviates from the set minimum or maximum value, the abnormality detection alarm device 15 is activated and an abnormality display lamp is activated. 29 shall be displayed and a warning shall be issued.

Next, FIG. 7 shows a diagram explaining the principle of the speed sensor.

In the figure, a speed sensor 12 is normally branched from a speedometer rotation cable from a transmission 20 of a vehicle engine 5 and serves as a detection source for vehicle speed, and a speed sensor 13 uses the rotational speed of a drive shaft of a hydraulic motor 10 as a detection source. shall be.

These rotational speeds are electrically converted by an electromagnetic detection device 32 via a speed change rotation device 31 incorporating a mechanically rotating detection object, and further converted by a required electrical signal conversion device 33 to be output from a hydraulic pump. This is input to the quantity control device 30.

[Effect of the invention] As explained above, according to the invention, the variable capacity hydraulic pump is connected to the flywheel of the vehicle engine and is rotationally driven, and the rotational speed is changed by changing the oil discharge amount of this hydraulic pump. a variable hydraulic motor; a liquid spray pump connected to the hydraulic motor and rotationally driven; a vehicle speed detecting means connected to the vehicle body traveling device for detecting vehicle speed; and a scatterer for detecting the rotation speed of the hydraulic motor. liquid rotation speed detection means;
By providing a liquid sprinkling amount control means for controlling the oil discharge amount of the hydraulic pump so that the liquid sprinkling amount of the liquid sprinkling pump is synchronized with the vehicle speed, the liquid sprinkling pump can be simply installed by the vehicle body traveling system or separately. The problems of the conventional technology for driving with an independent engine have been effectively solved, and the technical means of extracting the power of the car body engine applied to mixer trucks, snow plows, etc. by the flywheel has been applied, and the independent engine has been effectively solved. It is no longer necessary to install the engine separately from the car body engine, which greatly simplifies its configuration, solves the problems of noise and fuel costs caused by an independent engine, and reduces the amount of liquid sprayed by the rotation of the hydraulic motor at the vehicle speed. The amount of liquid sprayed per unit area is made uniform in accordance with the change in the amount of liquid, resulting in smooth and improved liquid sprinkling performance.

Note that the present invention is not limited to the above-mentioned embodiments,
For example, it is also possible to use other similar vehicle speed detection means or spray rotation speed detection means.

Furthermore, the present invention is not limited to the above-described embodiment, and it is also possible to drive other liquid dispersion means using the power from the flywheel to control the amount of liquid sprayed.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a water sprinkler to which the present invention is applied, Fig. 2 is a block diagram of an embodiment of the present invention, and Fig. 3 is a schematic diagram of a variable displacement hydraulic pump and a fixed displacement hydraulic motor. , Fig. 4 is a schematic diagram of the drive shaft for extracting power from the flywheel, Fig. 5 is a schematic diagram of the instrument panel installed in the driver's cab, and Fig. 6 is a diagram of the rotation speed of the liquid spray pump versus vehicle speed. , 7th
The figure is an explanatory diagram of the principle of a speed sensor. Explanation of the main symbols shown in the diagram: 1...Liquid spray vehicle, 5...Vehicle engine, 6...Flywheel, 8...Driving shaft, 9...Hydraulic pump, 10...Hydraulic motor , 11... dispersion pump,
13A...Sprinkling nozzle, 12, 13... Speed sensor, 14... Vehicle speed synchronization device, 15... Abnormality detection alarm device, 17... Swash plate, 22... Instrument panel, 3
0...Hydraulic pump discharge amount control device.

Claims (1)

[Scope of utility model registration request] A power take-off device that extracts power from an engine flywheel of a vehicle body traveling system, a variable displacement hydraulic pump connected to the power take-off device and driven to rotate, and a hydraulic motor whose rotation speed is made variable depending on the amount of oil discharged from the hydraulic pump. , a liquid spray pump connected to the hydraulic motor and rotationally driven; a vehicle speed detection means for detecting the vehicle speed of the vehicle body traveling device from a speedometer rotating cable; and a vehicle speed detecting means for detecting the rotation speed of the hydraulic motor or the liquid liquid pump. Controlling the oil discharge amount of the hydraulic pump so that the sprinkler discharge amount of the sprinkler pump is synchronized with the vehicle speed by the outputs of the sprinkler pump rotational speed detection means, the vehicle speed detector, and the sprinkler pump rotational speed detector. A vehicle speed synchronization device for a liquid spraying vehicle, characterized in that it is equipped with a liquid spraying amount control means.