KR20000046403A - Electric emergency steering device of construction heavy equipment - Google Patents

Abstract

PURPOSE: An electric emergency steering device of construction heavy equipment is provided to freely set up an installation position with an electric motor driving method, to regulate emergency steering time and to simplify the entire system without using an additional PTO drive for emergency steering pump. CONSTITUTION: An electric emergency steering device of construction heavy equipment is consisted of a power unit(100), a first switching unit(102), an alternator(104), an emergency steering pump(106), a pressure sensing unit(108), a second switching unit(110) and a timer(112). Herein, when the operation of an engine of a wheel type or hydraulic construction heavy equipment is stopped or a main steering pump is damaged, the pressure sensing unit senses the pressure abnormally generated. When a selection signal is fed, the second switching unit contacts the serial current power to the emergency steering pump. On the other hand, when the selection signal is not fed, the first switching unit blocks the serial current power.

Description

Electric emergency steer apparatus of construction vehicle

The present invention relates to an emergency steering apparatus for heavy construction equipment, and more particularly, to an emergency steering apparatus for an electrically driven wheel type or hydraulic heavy construction equipment.

In wheel excavators, wheel loaders, and the like, which are tire-driven construction heavy equipment, accidents occur when normal steering is not possible due to engine stop during operation and a fault of the hydraulic steering pump. For example, the inertia keeps the machine running even when the engine stops when driving on a hill and normal steering is impossible. In the prior art, the emergency steering pump mounted on the mission output shaft at this time allows the emergency steering pump to rotate in proportion to the traveling speed until the equipment is stopped by tire driving, thereby enabling instantaneous steering.

In the prior art as described above, in order to mount the emergency steering pump, a PTO drive for pump connection must be further processed in the transmission. That is, in the related art, transmission is added to prevent such an accident, which causes a price increase. In addition, since the pump is always running when the machine is running, in the case of normal steering, there is a valve for the internal cooling circulation circuit and a diverter valve that sends the emergency steering pump flow to the steering circuit by sensing when the main steering pump is damaged. As the pump is expensive and emergency steering is possible only when the equipment is moving, the emergency steering effect is halved at low speed.

Therefore, in the prior art, the emergency steering pump used for emergency steering is too expensive to configure the system as a safety selection device that may not be used most of the time until the life of the equipment.

Accordingly, an object of the present invention is to devise to improve the problems of the prior art as described above, the installation position is free by the electric motor drive method, the PTO drive for the emergency steering pump separate from the mission. The emergency steering time is adjustable and the overall system is to provide a simple electric emergency steering device for heavy construction equipment.

Apparatus for achieving the above object is an emergency steering apparatus of construction equipment, the power supply for generating a DC power of a predetermined size; A first switching unit for switching the DC power generated from the power supply unit according to a start on / off signal; An alternator for generating a DC power when the heavy construction equipment is in operation; An emergency steering pump for generating a pressure of a predetermined size so that steering operation of the heavy construction equipment can be performed; A pressure sensing unit for detecting an abnormally generated pressure when the engine of the heavy construction equipment is stopped or the main steering pump of the heavy construction equipment is broken; The DC power output from the first switching unit is connected to the emergency steering pump when the selection signal Cs is applied, and the DC power output from the first switching unit is cut off when the selection signal Cs is not applied. 2 switching unit; And receiving the DC power output from the first switching unit, receiving the DC power generated from the alternator, and supplying a detection signal from the pressure sensing unit to the second switching unit for a predetermined time interval. And a timer for applying Cs.

And an emergency steering display unit configured to generate an optical signal by receiving a DC power output from the second switching unit.

And a third switching unit configured to receive a DC power output from the first switching unit and apply a test signal Ts to the second switching unit. The second switching unit may further include a test signal Ts or a selection signal Cs. ) Is applied, the DC power output from the first switching unit is connected to the emergency steering pump, and if any one of the test signal Ts and the selection signal Cs is not applied, the direct current output from the first switching unit. It is characterized in that the power off.

The timer receives the DC power output from the first switching unit, receives the DC power generated from the alternator, and the sensing signal is supplied from the pressure sensing unit for the time interval of about 10 seconds. The selection signal Cs is applied to the second switching unit.

1 is a block diagram showing an embodiment of an electric emergency steering apparatus of a wheel-type or hydraulic heavy construction equipment according to the present invention.

2 is a block diagram showing another embodiment of the electric emergency steering apparatus of the wheel-type or hydraulic heavy construction equipment according to the present invention.

Figure 3 is a block diagram showing another embodiment of the electric emergency steering apparatus of the wheel-type or hydraulic heavy construction equipment according to the present invention.

Figure 4 is a detailed view of the electric emergency steering device of the wheel-type or hydraulic heavy construction equipment according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: power supply unit 102: first switching unit

104: alternator 106: emergency steering pump

108: pressure detection unit 110: second switching unit

112: timer 114: emergency steering display

116: third switching unit 400: battery

402: battery relay 404: alternator

406: emergency steering pump 408: pressure switch

410: emergency steering relay 412: timer

414: indicator lamp 416: emergency steering switch

418: start switch

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing an embodiment of an electric emergency steering apparatus of a wheel-type or hydraulic heavy construction equipment according to the present invention.

Electric emergency steering apparatus of the wheel type or hydraulic heavy construction equipment as shown in Figure 1 is the power supply unit 100, the first switching unit 102, the alternator 104, emergency steering pump 106, pressure sensing unit 108 ), A second switching unit 110 and a timer 112 are configured.

The mutual organic relationship between the components according to the embodiment of the electric emergency steering apparatus of the wheel type or hydraulic construction equipment according to the present invention will be described.

The power supply unit 100 generates a DC power of a predetermined size. The first switching unit 102 switches the DC power generated from the power supply unit according to the start on / off signal. The alternator 104 generates DC power when the wheel type or hydraulic heavy construction equipment is in operation. The emergency steering pump 106 generates pressure of a predetermined size so that steering operation of the wheel type or hydraulic heavy construction equipment can be performed. The pressure detector 108 detects abnormally generated pressure when the engine of the wheel type or hydraulic construction equipment is stopped or the main steering pump of the construction equipment is broken. The second switching unit 110 connects the DC power output from the first switching unit 102 to the emergency steering pump when the selection signal Cs is applied, and the first switching unit 110 when the selection signal Cs is not applied. The DC power output from the switching unit 102 is cut off. The timer 112 is supplied with the DC power output from the first switching unit 102, the DC power generated from the alternator 104, and the detection signal is supplied from the pressure sensing unit 108. When the selection signal Cs is applied to the second switching unit 110 for a predetermined time interval.

2 is a block diagram showing another embodiment of the electric emergency steering apparatus of the wheel-type or hydraulic heavy construction equipment according to the present invention.

The electric emergency steering apparatus of the wheel type or hydraulic construction equipment as shown in FIG. 2 includes a power supply unit 100, a first switching unit 102, an alternator 104, an emergency steering pump 106, and a pressure sensing unit 108. ), A second switching unit 110, a timer 112, and an emergency steering display unit 114.

The mutual organic relationship between the components according to another embodiment of the electric emergency steering apparatus of the wheel type or hydraulic construction equipment according to the present invention will be described.

The power supply unit 100 generates a DC power of a predetermined size. The first switching unit 102 switches the DC power generated from the power supply unit according to the start on / off signal. The alternator 104 generates DC power when the wheel type or hydraulic heavy construction equipment is in operation. The emergency steering pump 106 generates pressure of a predetermined size so that steering operation of the wheel type or hydraulic heavy construction equipment can be performed. The pressure detector 108 detects abnormally generated pressure when the engine of the wheel type or hydraulic construction equipment is stopped or the main steering pump of the construction equipment is broken. The second switching unit 110 connects the DC power output from the first switching unit 102 to the emergency steering pump when the selection signal Cs is applied, and the first switching unit 110 when the selection signal Cs is not applied. The DC power output from the switching unit 102 is cut off. The timer 112 is supplied with the DC power output from the first switching unit 102, the DC power generated from the alternator 104, and the detection signal is supplied from the pressure sensing unit 108. When the selection signal Cs is applied to the second switching unit 110 for a predetermined time interval. The emergency steering display 114 receives a DC power output from the second switching unit 110 to generate an optical signal.

Figure 3 is a block diagram showing another embodiment of the electric emergency steering apparatus of the wheel-type or hydraulic heavy construction equipment according to the present invention.

The electric emergency steering apparatus of the wheel type or hydraulic heavy construction equipment as shown in FIG. 3 includes a power supply unit 100, a first switching unit 102, an alternator 104, an emergency steering pump 106, and a pressure sensing unit 108. ), A second switching unit 110, a timer 112, an emergency steering display unit 114, and a third switching unit 116.

The mutual organic relationship between the components according to another embodiment of the electric emergency steering apparatus of the wheel type or hydraulic construction equipment according to the present invention will be described.

The power supply unit 100 generates a DC power of a predetermined size. The first switching unit 102 switches the DC power generated from the power supply unit according to the start on / off signal. The alternator 104 generates DC power when the wheel type or hydraulic heavy construction equipment is in operation. The emergency steering pump 106 generates pressure of a predetermined size so that steering operation of the wheel type or hydraulic heavy construction equipment can be performed. The pressure detector 108 detects abnormally generated pressure when the engine of the wheel type or hydraulic construction equipment is stopped or the main steering pump of the construction equipment is broken. The second switching unit 110 connects the DC power output from the first switching unit 102 to the emergency steering pump 106 when a test signal Ts or a selection signal Cs is applied. If any one of Ts) and the selection signal Cs is not applied, the DC power output from the first switching unit 102 is cut off. The timer 112 is supplied with the DC power output from the first switching unit 102, the DC power generated from the alternator 104, and the detection signal is supplied from the pressure sensing unit 108. When the selection signal Cs is applied to the second switching unit 110 for a predetermined time interval. The emergency steering display 114 receives a DC power output from the second switching unit 110 to generate an optical signal. The third switching unit 116 receives a DC power output from the first switching unit 102 and applies a test signal Ts to the second switching unit 110.

Figure 4 is a detailed view of the electric emergency steering device of the wheel-type or hydraulic heavy construction equipment according to the present invention.

In the detailed view of the electric emergency steering device of the wheel type or hydraulic heavy construction equipment as shown in Figure 4, 400 is a battery, 402 is a battery relay, 404 is an alternator, 406 is an emergency steering pump, 408 is a pressure switch, 410 is an emergency steering relay, 412 is a timer, 414 is an indicator lamp, 416 is an emergency steering switch, and 418 is a start switch.

In FIG. 4, the battery 400 corresponds to the power supply unit 100 of FIGS. 1 to 3, the battery relay 402 corresponds to the first switching unit 102 of FIGS. 1 to 3, and the alternator of FIG. 4. The naator 404 corresponds to the alternator 104 of FIGS. 1 to 3, the emergency steering pump 406 of FIG. 4 corresponds to the emergency steering pump 106 of FIGS. 1 to 3, and the pressure of FIG. 4. The switch 408 corresponds to the pressure sensing unit 108 of FIGS. 1 to 3, the emergency steering relay 410 of FIG. 4 corresponds to the second switching unit 110 of FIGS. 1 to 3, and FIG. 4. The timer 412 of FIG. 1 corresponds to the timer 112 of FIGS. 1 to 3, the display lamp 414 of FIG. 4 corresponds to the emergency steering display unit 114 of FIGS. 2 to 3, and the emergency steering of FIG. 4. The switch 416 corresponds to the third switching unit 116 of FIG. 3. In particular, the start on / off signal applied to the first switching unit 102 in FIGS. 1 to 3 is manually controlled by the operator using the start switch 418 of FIG. 4.

4 is a detailed view of FIGS. 1 to 3, and the detailed view corresponding to FIG. 1 corresponds to a view excluding the display lamp 414 and the third switching unit 416 in FIG. 4. In addition, the detailed view corresponding to FIG. 2 corresponds to a view excluding only the third switching unit 416 in the drawing of FIG. 4.

When the operator turns on the start switch 418, the power of the battery 400 flows into the BR terminal of the battery relay 402 so that a current flows in the coil. Accordingly, the A terminal and the B terminal of the battery relay 402 are operated. Is connected. Accordingly, power of the battery 400 flows into terminal 1 of the timer 412, terminal 1 of the emergency steering switch 416, and A terminal of the emergency steering relay 410. First, power supplied to terminal 1 of the timer 412 becomes a source power source capable of driving the timer 412. The alternator 404 continues to generate a predetermined DC voltage while the driver is in operation. The DC voltage generated by the alternator 404 flows into terminal 2 of the timer 412. The reason for the existence of the alternator 404 is because the object of the present invention is to prevent the risk of a situation that occurs when the driver driving the heavy construction equipment is in operation. In the normal operation state, the pressure switch 408 is connected to the switch, and terminal 3 of the timer 412 is connected to the ground terminal. However, abnormal pressure is detected as an accident occurs such as an engine suddenly stopped or a main steering pump (not shown) breaks. When the pressure switch 408 senses abnormal pressure, the switching state is opened so that terminal 3 of the timer 412 falls from the ground terminal. The timer 412 is driven only when three conditions are satisfied at the same time. That is, the timer 412 can exhibit the basic driving force when the battery power is supplied to the first terminal, and the DC voltage flows from the alternator 404 to the second terminal, and only when the third terminal is separated from the ground terminal. Power is leaked to terminal 1 for a predetermined time interval. Since the driving time of the timer 412 is limited to a predetermined time interval, driving of infinite time does not mean much. When an emergency occurs, only 10 seconds is enough time for the driver to safely handle the emergency. The driving time of the timer 412 is approximately 10 seconds. This is a degree that can be easily programmed by those skilled in the art is not limited to the driving time of the timer 412 to 10 seconds. Power leaked to terminal 4 of the timer 412 flows into the BR terminal of the emergency steering relay 410 so that a current flows in the coil to connect the A terminal and the B terminal of the emergency steering relay 410. On the other hand, when the A terminal and the B terminal of the emergency steering relay 410 is connected, the power of the battery 400 flows through the emergency steering relay 410 to the emergency steering pump 406 of the heavy construction equipment facing an emergency. Provide pressure to steer. On the other hand, the power leaked to the B terminal of the emergency steering relay 410 flows into the display lamp 414 to inform that the emergency steering state. The emergency steering switch 416 is intended for testing. When the driver manually turns on the switching state of the emergency steering switch 416 (of course, the start switch 418 is turned on), the power of the battery 400 is passed through the battery relay 402 of the emergency steering switch 416. It flows into the terminal 1 and flows into the BR terminal of the emergency steering relay 410 through the terminal 2 performs the same operation as described above.

The electric emergency steering apparatus of the present invention configured as described above may be applied to a wheel loader, which is one of wheel type construction heavy equipment.

The electric emergency steering apparatus of the wheel type or hydraulic heavy construction equipment as described above has the following effects.

First, the installation position is free by the electric motor drive method.

Second, the mission price can be reduced because the mission does not require a separate emergency steering pump PTO drive.

Third, emergency steering time can be adjusted.

Fourth, the overall device is simple, which can reduce the overall cost of about 50% compared to the conventional mechanical / hydraulic.

Claims (4)

In the emergency steering device of heavy equipment, A power supply unit 100 for generating a DC power of a predetermined size; A first switching unit (102) for switching the DC power generated from the power unit according to a start on / off signal; Alternator 104 for generating a DC power when the construction equipment is in operation; An emergency steering pump 106 generating a pressure of a predetermined size so that steering operation of the heavy construction equipment can be performed; A pressure sensing unit (108) for detecting an abnormally occurring pressure when the engine of the heavy construction equipment is stopped or the main steering pump of the heavy construction equipment is broken; When the selection signal Cs is applied, the DC power output from the first switching unit 102 is connected to the emergency steering pump. When the selection signal Cs is not applied, the DC power is output from the first switching unit 102. A second switching unit 110 to cut off the DC power; And When the DC power output from the first switching unit 102 is supplied, the DC power generated from the alternator 104 is supplied, and the detection signal is supplied from the pressure sensing unit 108, a predetermined time interval is provided. Electric emergency steering apparatus for heavy construction equipment, characterized in that it comprises a timer (112) for applying a selection signal (Cs) to the second switching unit (110) during. The electric emergency steering apparatus of construction equipment according to claim 1, further comprising an emergency steering display unit (114) for generating an optical signal by receiving the DC power output from the second switching unit (110). The switching device of claim 1, further comprising a third switching unit 116 receiving a DC power output from the first switching unit 102 and applying a test signal Ts to the second switching unit 110. bar, The second switching unit 110 connects the DC power output from the first switching unit 102 to the emergency steering pump 106 when a test signal Ts or a selection signal Cs is applied. The electric emergency steering apparatus of heavy equipment under construction characterized in that the DC power output from the first switching unit (102) is cut off if none of the Ts and the selection signal (Cs) are applied. The method of claim 1, wherein the timer 112 is supplied with a DC power output from the first switching unit 102, a DC power generated from the alternator 104, and the pressure sensing unit ( 108, if the detection signal is supplied to the electric emergency steering apparatus of the construction equipment, characterized in that for applying a selection signal (Cs) to the second switching unit 110 for a time interval of approximately 10 seconds.