JP2013056775A - Hydraulic supply device for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic supply device for a working machine enabling an operation time of an engine to be set.SOLUTION: A controller 19 operates an electric motor 6 by a predetermined operation time from the time when the operation is detected by operation detectors 12a and 13a, thereby driving hydraulic actuators 8 and 9 with a sub hydraulic pump 7. After a lapse of the predetermined operation time, the engine 1 is operated to drive the hydraulic actuators 8 and 9 with a main hydraulic pump 3, and the engine 1 is operated by longer than a charging time required for recovering a battery 5 for work whose electric power is consumed by the electric motor 6.

Description

  The present invention relates to a hydraulic pressure supply device for a working machine.

  2. Description of the Related Art Conventionally, a working machine-equipped vehicle in which a working machine is mounted on a vehicle is known as a working machine hydraulic pressure supply device. As a work machine-equipped vehicle, an aerial work vehicle in which a work table is moved up and down by hydraulic pressure on the vehicle is known. In recent years, there are also vehicles that use hydraulic pressure generated by an electric motor to reduce work noise. It is used.

  For example, in Patent Document 1, a first hydraulic pump driven by a vehicle engine for traveling on an aerial work vehicle and a working battery mounted separately from the vehicle battery mounted on the vehicle via an electric motor. And a second hydraulic pump to be driven, and the hydraulic pressure of the working machine is configured such that the hydraulic actuator of the working machine mounted on the vehicle is driven and controlled by the control valve with the hydraulic pressure from the first hydraulic pump and the second hydraulic pump. When a selection switch for selecting either one of the first hydraulic pump and the second hydraulic pump is provided in the supply device and the selection switch is switched to select the second hydraulic pump. An aerial work vehicle including a control unit that automatically stops a vehicle engine is disclosed (see FIG. 1 of Patent Document 1).

  On the other hand, in the above-described aerial work vehicle, when the operator switches to select the second hydraulic pump, the second hydraulic pump is continuously driven by the electric motor while the second hydraulic pump is selected. As a result, excessively discharging the working battery has been a problem. In addition, there has been a problem that the electric motor is heated and damaged when used for a long time.

  In addition, when the remaining capacity of the work battery is reduced, if the operator switches to select the second hydraulic pump by the selection switch, the second hydraulic pump can be used even if the vehicle engine is automatically stopped. May not be sufficiently driven, and the actuator of the working machine may be stopped.

  At this time, the working battery was completely discharged, which shortened the working battery life.

  Therefore, the operator switches the selection switch to select the first hydraulic pump, automatically starts the vehicle engine, and drives and controls the hydraulic actuator of the work implement by the hydraulic pressure from the first hydraulic pump. When the switch is switched, the work is temporarily stopped.

  Even if the second hydraulic pump is selected by the selection switch, if the remaining capacity of the working battery is low, the actuator does not operate normally, so it is necessary to switch to the first hydraulic pump again. The operation is troublesome.

  Therefore, for the purpose of solving the above-described problems, the hydraulic pressure supply device for a working machine disclosed in Japanese Patent Application No. 2007-171336 (Japanese Patent Application Laid-Open No. 2009-8194) includes mode selection means, and in the normal mode. In the economy mode, when the remaining capacity of the work battery exceeds the predetermined amount and the operation detecting means detects the operation, the sub hydraulic pump drives the hydraulic actuator for a predetermined time and the work battery is It is disclosed that the main hydraulic pump controls the hydraulic actuator to be driven when the remaining capacity is less than a predetermined amount or reaches a predetermined time.

Utility Model Registration No. 2523794

  However, the above-described hydraulic pressure supply device for a working machine disclosed in Japanese Patent Application Laid-Open No. 2009-8194 has focused on switching from the sub hydraulic pump to the main hydraulic pump.

  For this reason, after switching to the main hydraulic pump, it has not been possible to set a time for continuously operating the engine to charge the work battery.

  Accordingly, an object of the present invention is to provide a hydraulic pressure supply device for a working machine that can set an operating time of an engine.

  In order to achieve the above object, a hydraulic pressure supply device for a working machine according to the present invention is a vehicle engine alternator mounted separately from a main hydraulic pump driven by a traveling vehicle engine and a vehicle battery mounted on the vehicle. A main hydraulic pump and a sub hydraulic pump comprising: a working battery to be charged; a sub hydraulic pump driven by an electric motor fed from the working battery; and a controller for operating the vehicle engine and the electric motor. A hydraulic pressure supply device for a work machine that is configured to drive and control a hydraulic actuator of a work machine mounted on a vehicle with hydraulic pressure from a control valve to which an operation detection unit that detects operation is attached, The controller operates the electric motor in a predetermined operation from when the operation is detected by the operation detection means. And the sub hydraulic pump drives the hydraulic actuator for a period of time, and after a predetermined operating time has elapsed, the engine is operated and the main hydraulic pump drives the hydraulic actuator to stop the electric motor, The engine is operated for a predetermined charging time.

  In addition, the predetermined charging time for operating the engine may be a recovery time necessary for recovering the working battery that has consumed power by the electric motor.

  Further, the controller compares the predetermined charging time with a time obtained by adding a predetermined standby time to the engine operating time when no operation is detected by the operation detecting means, and operates the engine for a longer time. It is preferable to make it.

  Furthermore, it is preferable that the vehicle battery and the work battery are charged via a charge controller including a vehicle battery priority charge circuit that charges the work battery when the vehicle battery is in a fully charged state.

  The work vehicle includes the hydraulic pressure supply device for any one of the work machines described above.

  In order to achieve the above object, in the hydraulic pressure supply device for a working machine according to the present invention, the controller operates the electric motor for a predetermined operating time to drive the hydraulic actuator with the sub hydraulic pump, and after the predetermined operating time has elapsed. Operates the engine, drives the hydraulic actuator with the main hydraulic pump, stops the electric motor, and operates the engine for a predetermined charging time.

  Therefore, since the working battery that has consumed power by the sub hydraulic pump is charged by a predetermined amount by the operation of the engine, it is possible to prevent the working battery from being deteriorated by deep discharge.

  In addition, the predetermined charging time for operating the engine is a recovery time necessary for recovering the work battery that has consumed power by the electric motor, so that the power is supplied by the sub hydraulic pump for each cycle of the work. Can recover the work battery that has been consumed, and balance the balance between discharge and charge.

  In addition, when the operation is no longer detected by the operation detection means, the controller compares a predetermined charging time with a time obtained by adding a predetermined waiting time to the engine operating time, and operates the engine for the longer time.

  Therefore, if the work battery is sufficiently charged, the engine stops at the same time as the operation is completed, or if the operator performs an intermittent operation that repeats the operation for a short time, the sub hydraulic pump is activated for each intermittent operation. Can be prevented from restarting.

  In addition, when the working battery is not sufficiently charged, the working battery can be sufficiently charged by operating the engine until a predetermined charging time is reached.

  In addition, the vehicle battery and the work battery are charged via a charge controller having a vehicle battery priority charging circuit that charges the work battery when the vehicle battery is in a fully charged state, thereby reducing the capacity of the vehicle battery. This ensures that the vehicle engine can be started reliably.

  The work vehicle includes the hydraulic pressure supply device for any one of the work machines described above, so that the work vehicle can be efficiently operated and the consumption of unnecessary fuel is suppressed.

It is a circuit diagram explaining the structure of the hydraulic pressure supply apparatus of the working machine of the best embodiment of this invention. It is a perspective view explaining the structure of an aerial work vehicle. It is a flowchart explaining the charge process which charges a working battery using the hydraulic pressure supply apparatus of the working machine of the best embodiment of this invention.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  First, the overall configuration of an aerial work vehicle C as a work vehicle will be described with reference to FIG. Here, the work vehicle in the present invention is not limited to the aerial work vehicle C, and may be any vehicle provided with a working machine such as a crane.

  An aerial work vehicle C according to the present embodiment includes a vehicle body 31 serving as a main body portion of a vehicle having a traveling function, a turntable 32 as a work machine attached to the vehicle body 31 so as to be horizontally turnable, and the turntable 32. A fixed bracket 33, a telescopic boom 34 as a work machine attached to the bracket 33, and outriggers 39,... As work machines provided at the four corners of the vehicle body 31. ing.

  The swivel base 32 has a pinion gear to which the power of the turning motor is transmitted, and the pinion gear meshes with a circular gear provided on the vehicle body 31 to rotate around the swivel axis.

  Further, the telescopic boom 34 is configured to be nested by a base end boom 341, an intermediate boom 342, and a front end boom 343, and can be expanded and contracted by a hydraulic cylinder (not shown) as a working machine.

  The base end boom 341 has a base end portion attached to the bracket 33 by a support shaft 35 installed horizontally on the bracket 33, and can be raised and lowered up and down.

  A hoisting cylinder (hydraulic cylinder) 36 as a work machine is bridged between the bracket 33 and the vicinity of the distal end of the base end boom 341, and the telescopic boom 34 is raised and lowered by extending and retracting the hoisting cylinder 36. be able to.

  Further, a bucket 37 as a work table on which an operator works at a high place is attached to the tip of the tip boom 343 so as to be rotatable up and down and left and right.

  Further, the bucket 37 has an upper operation device 38 having an operation lever, an operation selection switch, and the like so that the operator can turn, undulate, extend and retract the boom 34 and swing the bucket 37 while the operator rides on the bucket 37. Is provided.

  In addition, an operation device storage portion 40 is provided at the rear portion of the vehicle body 31, and a lower operation device 41 capable of performing substantially the same operation as the upper operation device 38 is installed therein.

  Further, the outrigger 39 prevents the aerial work vehicle C from overturning, and is provided on the left and right of the front side and the rear side of the vehicle body 31, and is overhanged and grounded by hydraulic pressure.

  Next, the configuration of the hydraulic pressure supply device S for the working machine built in the vehicle body 31 will be described with reference to FIG.

  The hydraulic pressure supply device S for a working machine according to the present embodiment includes an engine 1 that is a prime mover for traveling, a vehicle battery 4 that supplies power to a cell motor 1a that starts the engine 1, and a PTO (power that extracts rotational power of the engine 1). 2), the main hydraulic pump 3 connected to the PTO 2, the hydraulic actuators 8 and 9 as working machines driven by the main hydraulic pump 3, and the sub hydraulic pressure that drives the hydraulic actuators 8 and 9 when the engine 1 is stopped. A pump 7, an electric motor 6 connected to the sub-hydraulic pump 7, and a work battery 5 that supplies power to the electric motor 6 are provided.

  The engine 1 includes a cell motor 1 a that starts the engine 1, an alternator 1 b that generates electricity for charging the vehicle battery 4 and the work battery 5, and a fuel injection pump control device 1 c for the engine 1.

  Further, the main hydraulic pump 3 is connected to a PTO 2 coupled to a transmission (not shown) so that the power of the rotating engine 1 can be directly taken out and converted into hydraulic pressure.

  Further, the vehicle battery 4 is operated by supplying power to the cell motor 1a, the fuel injection pump control device 1c, and the like, and generally a lead storage battery is used.

  Similarly, the work battery 5 is operated by supplying power to the electric motor 6 connected to the sub hydraulic pump 7, the controller 19, or the like, and a lead storage battery is generally used.

  The vehicle battery 4 and the work battery 5 do not have to be lead storage batteries but may be any secondary batteries that can be charged and used repeatedly.

  The sub hydraulic pump 7 generates hydraulic pressure by the rotational power of the electric motor 6 fed from the work battery 5.

  Furthermore, as described above, the hydraulic actuators 8 and 9 as the work machines are other than the vehicle body 31 having a traveling function and are generated by the hydraulic pressure generated for the work, so that the swivel base 32 and the telescopic boom 34 shown in FIG. The cylinder 36, the bucket 37, the outrigger 39, etc. are driven.

  The hydraulic actuators 8 and 9 are controlled by control valves 10 and 11 that are opened and closed by operating operation levers 12 and 13 for manual operation by an operator. The operation levers 12 and 13 are connected to operation detectors 12 a and 13 a that sense the operation by the operator and notify the controller 19.

  Further, the charge controller 14 receives the generated power from the alternator 1b, charges the vehicle battery 4 without charging the work battery 5 when the vehicle battery 4 is not fully charged, and the vehicle battery 4 is fully charged. In order to charge the work battery 5 at this time, the controller is a charging controller provided with a priority charging circuit that preferentially charges the vehicle battery 4.

  Furthermore, the starter relay 15 is an electromagnetic relay that opens and closes the connection between the vehicle battery 4 and the cell motor 1a. Upon receiving a command from the controller 19 described later, the vehicle battery 4 is connected to the cell motor 1a to start the vehicle engine 1. .

  The electric motor drive relay 16 is an electromagnetic relay that opens and closes the connection between the work battery 5 and the electric motor 6, and connects the work battery 5 to the electric motor 6 in response to a command from a controller 19 described later. The electric motor 6 is driven.

  The controller 19 is a microcontroller that is configured integrally with a control device that controls the operation of the work machine, a safety device, and the like, and includes an integrated circuit.

  Further, the controller 19 is supplied with power from the work battery 5, receives notifications from the operation detectors 12a, 13a, etc., and notifies the starter relay 15, the electric motor drive relay 16, and the starter relay 15 with commands. The timing to open and close is adjusted.

  Then, as will be described later, the controller 19 operates the electric motor 6 for a predetermined operation time T1 to drive the hydraulic actuators 8 and 9 with the sub hydraulic pump 7, and after the predetermined operation time T1, the engine 1 is operated. The hydraulic actuators 8 and 9 are driven by the main hydraulic pump 3 and the engine 1 is controlled to operate for a predetermined charging time T2 or longer.

  In addition, when the operation is not detected by the operation detectors 12a and 13a as the operation detecting means when the predetermined charging time T2 has elapsed after the engine 1 is operated, the controller 19 further performs the engine for the predetermined waiting time T3. 1 is controlled to operate.

  Next, a charging process for charging the work battery by the command of the controller 19 using the hydraulic pressure supply device S of the working machine according to the present embodiment will be described with reference to the flowchart of FIG.

  First, the engine 1 is stopped by an operator operating an engine stop switch (not shown) (step S1). The engine stop may be by a so-called idling stop mechanism that detects a stop and automatically stops the engine 1.

  Next, it is determined whether or not the operation levers 12 and 13 have been operated based on notifications from the operation detectors 12a and 13a (step S2).

  When notifying that the operation levers 12 and 13 have been operated, the same determination is repeated (NO in step S2).

  If the operation levers 12 and 13 have been operated (YES in step S2), the electric motor drive relay 16 is closed and the electric motor 6 and the work battery 5 are electrically connected to be electrically operated. The sub hydraulic pump 7 is driven by the motor 6 (step S3).

  Then, integration of the drive time after the operation is started (step S4), and it is determined whether or not the predetermined operation time T1 has been reached (step S7).

  If the predetermined operation time T1 has not elapsed since the operation, the same determination is repeated (NO in step S7 to step S4).

  Further, if the operation is completed before the predetermined operating time T1 has elapsed (NO in step S5), the sub hydraulic pump 7 is stopped (step S6), and the same processing (steps S2 to S6) is repeated.

  Further, if the operation is continued when the operation time T1 has elapsed (YES in step S7), the starter relay 15 is closed, the cell motor 1a and the vehicle battery 4 are electrically connected, the engine 1 is started, and the PTO 2 When the main hydraulic pump 3 is driven and sufficient hydraulic pressure is generated in the main hydraulic pump 3, the electric motor drive relay 16 is opened to stop the sub hydraulic pump 7 (step S8).

  Then, after starting the integration of the engine operating time T5 after the engine 1 is operated (step S9), it is determined whether or not the operation levers 12 and 13 are operated (step S10).

  If the operation continues (YES in step S10), the same determination is repeated until the operation ends (step S10).

  If the operation has been completed (NO in step S10), the length of time obtained by adding the predetermined standby time T3 to the engine operating time T5 and the predetermined charging time T2 are compared (step S11).

  If the time obtained by adding the predetermined standby time T3 to the engine operating time T5 is longer (YES in step S11), the standby for determining whether the non-operation time that is the time after the end of the operation has reached the standby time T3. The process proceeds to time elapse processing (steps S12 to S14).

  If the predetermined charging time T2 is longer (NO in step S11), the process proceeds to a charging time elapse process for determining whether the engine operating time T5 has reached the charging time T2 (steps S15 to S16).

  In the standby time elapse process (YES in step S11), the integration of the non-operation time is started (step S12), and it is determined whether or not the non-operation time has reached a predetermined standby time T3 (step S13).

  If the non-operation time has reached the predetermined standby time T3 (YES in step S13), the process returns to the start of the charging process, and the engine 1 is stopped (step S1).

  If the non-operation time has not reached the predetermined waiting time T3 (NO in step S13), it is determined whether or not the operation is further performed (step S14). If the operation is not performed (NO in step S14), the same processing is repeated. (Steps S13 and S14) If operated (YES in Step S14), the engine operating time T5 is accumulated again.

  In the charging time lapse process (NO in step S11), it is determined whether the engine operating time T5 has reached a predetermined charging time T2 (step S15).

  If the engine operating time T5 has reached the predetermined charging time T2 (YES in step S15), the process returns to the start of the charging process, and the engine 1 is stopped (step S1).

  If the engine operating time T5 has not reached the predetermined charging time T2 (NO in step S15), it is determined whether or not the engine is operating further (step S16), and if not operated (NO in step S16), the same processing is performed. Repeatedly (steps S15 and S16), if operated (YES in step S16), the engine operating time T5 is accumulated again.

  As described above, the charging process for charging the work battery 1 is performed by the controller 19.

  In the above processing, the charging time T2 is set to the recovery time T4 required for charging and recovering the electric power consumed by the electric motor 6 operated during the operation time T1 by the operation of the engine 1. be able to.

  For example, if the consumption current value when using the electric motor 6 is 60 (A), the operation time T1 is 10 (seconds), and the charging current value when the engine 1 is operating is 20 (A), the charging time T2 is 10 × 60. / 20 = 30 (seconds).

  Next, the operation of the hydraulic pressure supply device S of the working machine according to the present embodiment will be described.

  As described above, in the hydraulic pressure supply device S for the working machine according to the present embodiment, the controller 19 operates the electric motor 6 for a predetermined operating time T1 to drive the hydraulic actuators 8 and 9 with the sub hydraulic pump 7 to perform the predetermined operation. After the operating time T1 elapses, the engine 1 is operated to drive the hydraulic actuators 8 and 9 with the main hydraulic pump 3, and the engine 1 is operated for a predetermined charging time T2 or longer.

  Therefore, since the work battery 5 that has consumed power by the sub hydraulic pump 7 is charged by a predetermined amount by the operation of the engine 1, it is possible to prevent the work battery 5 from being deteriorated by deep discharge.

  In addition, the charging time T <b> 2 for operating the engine 1 can be a recovery time T <b> 4 necessary for recovering the work battery 5 that has consumed power by the electric motor 6.

  Therefore, it is possible to recover the work / battery 5 in which power is consumed by the sub-hydraulic pump 7 for each work cycle, and to balance the balance between discharge and charge.

  That is, the electric power of the work battery 5 consumed by the electric motor 6 in one work cycle is supplemented by being charged by the alternator 1b of the engine 1 in the same work cycle.

  Then, in the next work cycle, the work battery 5 is in a recovered state, so that the remaining capacity of the work battery 5 does not become insufficient and the work cannot be disabled.

  In addition, if the working battery 5 can be recovered for each cycle of the work in this way, the working battery 5 can be shortened in depth of discharge to increase the life, and the working battery 5 has a capacity. Can be used.

  The controller 19 compares the time obtained by adding the predetermined standby time T3 to the engine operating time T5 with the predetermined charging time T2 when the operation is no longer detected by the operation detectors 12a and 13a. The engine 1 is operated.

  That is, when the operation continues for a long time and the engine operating time T5 is long, and the time obtained by adding the predetermined standby time T3 to the engine operating time T5 is equal to or longer than the predetermined charging time T2, The engine 1 is operated until the non-operation time reaches a predetermined waiting time T3.

  On the other hand, when the operation is finished immediately and the engine operating time T5 is short and the time obtained by adding the predetermined standby time T3 to the engine operating time T5 is equal to or shorter than the predetermined charging time T2, the engine operating time The engine 1 is operated until T5 reaches a predetermined charging time T2.

  Therefore, when the engine operating time T5 is long and the work battery 5 is sufficiently charged, the engine 1 is stopped at the same time as the operation is completed, or the intermittent operation is repeated every time the operator repeats the short operation. Further, it is possible to prevent the sub hydraulic pump 7 from operating or the engine 1 from restarting.

  That is, depending on the operator, there is a case where the operation levers 12 and 13 are inserted and returned instantaneously, and the position of the work implement is finely adjusted by repeating the fine movement of the work implement. If T3 is not provided, the electric motor 6 operates or the engine 1 restarts for each operation.

  Therefore, when the operator performs the intermittent operation as described above, the integration time is reset and the series of charging processes is not terminated, thereby preventing the operation of the electric motor 6 and the restart of the engine 1. be able to.

  When the engine operation time T5 is short and the work battery 5 is not sufficiently charged, the work battery 5 can be sufficiently charged by operating the engine 1 until the predetermined charge time T2 is reached.

  Furthermore, the vehicle battery 4 and the work battery 5 are charged via a charge controller 14 having a vehicle battery priority charging circuit that charges the work battery 5 when the vehicle battery 4 is in a fully charged state. The remaining capacity of the vehicle battery 4 can be secured and the vehicle engine 1 can be started reliably.

  Thus, if the vehicle battery 4 can be preferentially charged and the start of the engine 1 of the vehicle can be ensured at the time of working / running, the possibility of being unable to work / running can be suppressed.

  The aerial work vehicle C as the work vehicle according to the present embodiment includes the hydraulic pressure supply device S for any of the work machines described above, so that the work can be efficiently performed and unnecessary fuel consumption is performed. It becomes a work vehicle that suppresses.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are possible. Are included in the present invention.

  For example, in the above-described embodiment, the case where the controller 19 operates the engine 1 only for the standby time T3 when the charging time T2 has elapsed has been described. However, the present invention is not limited to this, and the controller 19 does not provide the standby time T3. It may be.

  Moreover, although the said embodiment demonstrated the case where the vehicle battery 4 and the work battery 5 were charged via the charge controller 14 provided with the vehicle battery priority charge circuit, it is not limited to this, charge The controller 14 may not be provided.

  Further, in the above-described embodiment, the case where the operation time T1 of the electric motor 6 is set as a fixed value in advance has been described. However, the present invention is not limited to this and may be adjusted according to the preference of the operator. Alternatively, it may be variable in conjunction with the contents of the work.

  In the above embodiment, the case where the predetermined charging time T2 is set to the recovery time T4 necessary for recovering the power consumed by the electric motor 6 operated during the operation time T1 has been described. The time is not limited to this, and may be any time as long as the working battery 5 can be charged to a certain degree (for example, about several minutes).

  In the above embodiment, the case where the engine 1 is operated for a predetermined charging time T2 to charge the work battery 5 has been described. However, the present invention is not limited to this, and the voltage and specific gravity of the work battery 5 are not limited thereto. The work battery 5 may be charged by a predetermined amount based on the above.

  Further, in the above embodiment, the case where the time obtained by adding the standby time T3 to the engine operating time T5 and the charging time T2 has been described, but the present invention is not limited to this. A time obtained by subtracting the standby time T3 from the charging time T2 may be compared.

  In the above-described embodiment, the work battery 5 has been described as not being used for the traveling function. However, the present invention is not limited to this and may be applied to small movements at the work site.

C Aerial work vehicle (work vehicle)
S Hydraulic pressure supply device for work machine T1 Operating time T2 Charging time T3 Standby time T4 Recovery time T5 Engine operating time 1 Engine (vehicle engine)
1b Alternator 2 PTO
3 Main hydraulic pump 4 Vehicle battery 5 Working battery 6 Electric motor 7 Sub hydraulic pump 8, 9 Hydraulic actuator (work machine)
12, 13 Operation levers 12a, 13a Operation detector 14 Charge controller 19 Controller

Claims (4)

Driven by a main hydraulic pump driven by a vehicle engine for traveling, a working battery mounted separately from the vehicle battery mounted on the vehicle and charged by an alternator of the vehicle engine, and an electric motor powered by the working battery And a controller for operating the vehicle engine and the electric motor, and operating a hydraulic actuator of a work machine mounted on the vehicle with hydraulic pressure from the main hydraulic pump and the sub hydraulic pump. A hydraulic pressure supply device for a work machine that is driven and controlled by a control valve to which an operation detecting means for detecting the operation is attached,
The controller operates the electric motor for a predetermined operation time from when the operation is detected by the operation detection means to drive the hydraulic actuator with the sub hydraulic pump, and after the elapse of a predetermined operation time, the controller Operate the engine, drive the hydraulic actuator with a main hydraulic pump, stop the electric motor,
A hydraulic pressure supply device for a working machine, wherein the engine is operated for a predetermined charging time.   2. The work implement according to claim 1, wherein the predetermined charging time for operating the engine is a recovery time necessary for recovering the work battery that has consumed power by the electric motor. Hydraulic supply device.   The controller compares the predetermined charging time with a time obtained by adding a predetermined standby time to the engine operating time when no operation is detected by the operation detecting means, and operates the engine for a longer time. The hydraulic pressure supply device for a working machine according to claim 1, wherein the hydraulic pressure supply device is a working machine.   The vehicle battery and the work battery are charged via a charge controller including a vehicle battery priority charging circuit that charges the work battery when the vehicle battery is in a fully charged state. The hydraulic pressure supply device for a working machine according to any one of claims 1 to 3.