JPS5928805A - Industrial vehicle - Google Patents

Abstract

PURPOSE:To eliminate the noise and exhaust gas of an industrial vehicle by driving a running DC motor and a working DC motor by an AC generator which is coupled directly to an engine operated under the optimum conditions by the control of a governor and composing to be able to charge a storage battery. CONSTITUTION:A engine 1 is controlled by a governor, and operated in the vicinity of the rotating speed of the optimum fuel consumption. When switches 3, 13 are closed in the state that a battery 14 is stored, a hydraulic pump driving DC motor 7 is rotated, and the output of a 3-phase AC generator 3 is preferentially used while a load is relatively small. When the load then relatively increases, a current is supplied to the load also from the battery 14. When an accelerator 18 is further depressed, a thyristor chopper controller 12 is controlled to flow the current proportional to the depressing stroke through a running DC motor 11. Then, it is operated only by the battery 14 at the time of working in a room, and an external power source can be used via a plug socket 15 for commercial electric power to charge the battery 14. In this manner, an industrial vehicle of high performance can be obtained.

Description

[Detailed description of the invention] The present invention relates to industrial vehicles.

Conventional industrial vehicles can be classified based on the type of drive source (1
) The engine is used as a drive source to transmit mechanical power to the running tires, and (5) the engine directly drives the working hydraulic pump. (2) The engine drives a generator, and its output directly drives the running electric motor and The engine-electric method drives the electric motor for work, and (3) the battery method uses the battery as an energy source to drive the electric motor for travel and the electric motor for work. Both methods are accompanied by noise and exhaust gas pollution, so they are problematic for indoor work. (3) The battery method has a limit to the stored energy of the battery, so continuous operation is not possible, and efficiency is poor due to lack of capacity.

The present invention was proposed in view of the above circumstances, and aims to provide an industrial vehicle that does not produce noise or exhaust gas, has high efficiency, and can be operated continuously. An engine operated nearby, an alternator driven by the engine, a transformer and a rectifier inserted into the output circuit of the alternator, a DC motor for driving driven by the output of the rectifier, and work. It is equipped with a DC motor for machine use, and a storage battery that is charged by the output of the rectifier to drive the DC motor for traveling and/or the DC motor for work equipment, and when the power consumption of the DC motor is relatively small, the AC generator is used. The storage battery is charged with the output of the AC generator, and when the power consumption of the inner DC motor exceeds the output of the AC generator, the output of the storage battery is supplied to the inner DC motor.

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram thereof, FIG. 2 is an electrical characteristic diagram of FIG. 1, and FIG. 3 is a characteristic diagram of the engine of FIG. 1.

In the diagram above, 1 is the engine E/G, 2 is the three-phase alternator AC/G driven by engine 1, 3 is the switch, and 4 is the
is a transformer, 5 is a rectifier, 6 is a working hydraulic pump O/P
, 7 is a direct current motor DC/M for driving a hydraulic pump, 8 is a running tire, 9 is a differential gear D/F, 10 is a reduction gear T/M
, 11 is a direct current motor (DC/M) for driving, 12 is a silice chopper control device 5CR113 is a switch, 14 is a battery, 15 is a commercial power outlet, 16 is a generator rotation speed control device C/B, 17 is a switch , 18 is an accelerator.

In such a device, first engine 1 is started,
Switches 3 and 13 are turned on while battery 14 is also charged.

Then, the hydraulic pump driving DC motor 7 starts rotating, and first, while the load is relatively small, the output of the three-phase AC generator 3 is used preferentially as shown in FIG. When becomes relatively large, current is also supplied from the battery 14 to the load, and when the accelerator 18 is further depressed, thyristor chopper control is performed so that a current proportional to the degree of depression flows to the driving DC motor 11. Device 1
2.

Next, if you want to operate with only the battery 14 during indoor work, stop the engine 1 and turn off the switch 3.

Furthermore, when you want to charge the battery 14, the engine 1
, turn off switches 3 and 17, do not press the accelerator 18, and connect the commercial power outlet 15.
Just plug it into an external power source.

Then, the transformation ratio of the transformer 4 is set so that the terminal voltage can be obtained after rectification, as shown in FIG.

According to such a device, the following effects can be achieved.

(1) Since the generator load is set to the optimal fuel efficiency state of the engine as shown in FIG. 3, fuel efficiency is achieved compared to the operating state of conventional automobiles and construction machinery.

(2) Since the battery functions to store the excess output of the generator, the work vehicle can be operated with a relatively small engine relative to the load, resulting in less noise and less exhaust gas.

(3) When working indoors, the engine is stopped and the machine runs solely on battery power, so no noise or exhaust gas is generated.

(4) With a transformer and rectifier, both commercial power and engine power can be used.

(5) Since the overcurrent discharge value of the battery can be reduced, the battery discharge efficiency is improved and the battery life is also extended. (6) The battery is charged by the generator during work, so
The operating time of conventional battery-powered work vehicles will also be longer.

In short, according to the present invention, there is provided an engine that is controlled by a governor and is operated at a rotational speed near the optimal fuel efficiency, an alternator driven by the engine, and a transformer inserted in the output circuit of the alternator. and a rectifier, a DC motor for traveling and a DC motor for working equipment driven by the output of the rectifier, and a storage battery charged by the output of the rectifier to drive the DC motor for traveling and/or the DC motor for working equipment. , when the power consumption of both DC motors is relatively small, the storage battery is charged by the output of the AC generator, and when the power consumption of both DC motors exceeds the output of the AC generator, the output of the storage battery is charged. The present invention is industrially extremely useful because a high-performance industrial vehicle is obtained by supplying the above-mentioned DC motors to both DC motors.

[Brief explanation of the drawing]

7. FIG. 1 is a system diagram showing an embodiment of the present invention, FIG. 2 is an electrical characteristic diagram of FIG. 1, and FIG. 3 is a characteristic diagram of the engine shown in FIG. 1. 1. Engine, 2. 3-phase alternator, 3. Switch, 4. Transformer, 5. Rectifier, 6. Hydraulic pump for work, 7. Hydraulic pump, DC motor for drive, 8.・
Running tire 59...Differential gear, 10...Reduction gear, 11
・・Direct current motor for driving, 12・・Zyristor chopper control device, 13・・Switch, 14・・Battery, 15・
・Commercial power outlet, 16... Generator speed control device, 17... Switch, 18... Accelerator, Sub-Agent Masafumi Tsukamoto, Patent Attorney

Claims (1)

[Claims] An engine controlled by a governor and operated at a rotational speed near optimum fuel efficiency, an alternator driven by the engine, a transformer and a rectifier inserted into the output circuit of the alternator, and the output of the rectifier. and a storage battery charged by the output of the rectifier to drive the traveling DC motor and/or the working equipment DC motor. When is relatively small, the storage battery is charged with the output of the alternator, and when the power consumption of both the DC motors exceeds the output of the AC generator, the output of the storage battery is supplied to the DC motors. An industrial vehicle characterized by being designed to