JP2020108213A - Electric work vehicle - Google Patents

Abstract

To provide an electric work vehicle which enables a hydraulic cylinder to operate in a reliable manner under a low temperature environment with a simple structure.SOLUTION: An electric work vehicle includes: a first hydraulic cylinder 45, a second hydraulic cylinder 46, and a third hydraulic cylinder 47; a hydraulic system 40 which supplies a working fluid to the hydraulic cylinders; and a travel motor 6. The hydraulic system 40 includes an oil temperature circuit 60A which uses heat generated by the travel motor 6 to heat the working fluid.SELECTED DRAWING: Figure 3

Description

The present invention relates to an electric work vehicle including a hydraulic cylinder and an electric motor.

For example, Patent Document 1 describes a tractor including a hydraulic cylinder and an electric motor. The hydraulic cylinder moves up and down a working machine (a rotary etc. for cultivating a field). The electric motor drives the traveling device.

JP, 2017-24710, A

The hydraulic oil supplied to the hydraulic cylinder needs to have an appropriate viscosity. In a low temperature environment, the viscosity of hydraulic oil becomes high, and the hydraulic cylinder may not operate properly. It may be possible to provide a heater or the like that heats by heating the hydraulic oil to heat the hydraulic oil, but this is not preferable because the number of parts constituting the electric work vehicle increases.

In view of the above-mentioned circumstances, an object of the present invention is to provide an electric work vehicle that can operate a hydraulic cylinder reliably even in a low temperature environment with a simple configuration.

An electric work vehicle according to the present invention includes a hydraulic cylinder, a hydraulic oil supply unit that supplies hydraulic oil to the hydraulic cylinder, and an electric motor. The hydraulic oil supply unit uses heat generated from the electric motor. It is characterized in that a heating unit for heating the hydraulic oil is provided.

According to this characteristic configuration, the temperature of the hydraulic oil can be adjusted to an appropriate temperature by heating the hydraulic oil by using the heat generated from the electric motor. The viscosity can be made appropriate and the hydraulic cylinder can be operated reliably.

In the present invention, a control unit that controls the hydraulic oil supply unit to perform an oil temperature adjusting operation for heating the hydraulic oil is provided, and the control unit adjusts the oil temperature according to the operation received by the manual operation tool. Is preferred.

According to this configuration, the driver of the electric work vehicle can operate the manual operation tool to execute the oil temperature adjusting operation, so that the operating oil is heated as necessary when the environmental temperature is low, The hydraulic cylinder can be operated reliably.

In the present invention, a control unit that controls the hydraulic oil supply unit to execute an oil temperature adjusting operation to heat the hydraulic oil is provided, and the control unit is configured to control the oil temperature according to the temperature of the hydraulic oil detected by the temperature sensor. It is preferable to perform the adjusting operation.

According to this configuration, the hydraulic oil can be appropriately heated according to the detected temperature of the hydraulic oil, and the hydraulic cylinder can be reliably operated.

In the present invention, it is preferable to include an informing mechanism for informing according to the temperature of the hydraulic oil detected by the temperature sensor.

According to this configuration, the driver can know the state of the hydraulic oil by the notification, and thus the driver can take an appropriate response according to the notification.

In the present invention, a control unit that controls the hydraulic oil supply unit to execute an oil temperature adjusting operation for heating the hydraulic oil, and a battery that supplies electric power to an electric motor are provided, and the control unit includes the battery. It is preferable to execute the oil temperature adjustment operation during the charging of.

If extra power is consumed by the oil temperature adjustment operation, the operating time of the electric work vehicle using the battery will be shortened. According to this configuration, since the oil temperature adjustment operation is performed during charging of the battery, sufficient electric power is stored in the battery, and it is possible to suppress a reduction in operating time of the electric work vehicle.

In the present invention, it is preferable to include a work motor as the electric motor for driving the work device.

According to this configuration, the working oil can be heated using the heat generated from the working motor that drives the working device.

In the present invention, a control unit that controls the hydraulic oil supply unit to perform an oil temperature adjusting operation to heat the hydraulic oil, a traveling motor that drives a traveling device, and a traveling motor as the electric motor, and an electric power to the traveling motor. It is preferable that the control unit causes the power supply unit to supply power to the travel motor when the oil temperature adjusting operation is performed.

According to this configuration, electric power can be supplied from the electric power supply unit to the traveling motor, and the working oil can be heated using the heat generated from the traveling motor. For example, it is possible to heat the hydraulic oil without driving the electric work vehicle by supplying a small amount of electric power from the power supply unit to the traveling motor to heat the traveling motor so that the traveling device does not operate.

In the present invention, a braking mechanism for braking the traveling device is provided, and the control unit controls the electric power supply unit to supply electric power to the traveling motor while operating the braking mechanism when executing the oil temperature adjusting operation. Is preferably supplied.

According to this configuration, electric power can be supplied to the traveling motor while the traveling device is being braked, and the working oil can be heated using the heat generated from the traveling motor. For example, it is possible to heat the hydraulic oil while keeping the electric work vehicle stopped or moving at a predetermined speed by the braking mechanism.

It is a right view which shows the whole riding-type mower. It is a top view which shows the whole riding-type mower. It is a circuit diagram which shows the hydraulic system of a riding-type mower. It is a control block diagram of a riding-type mower. It is a circuit diagram which shows the hydraulic system of the riding type mower which concerns on another embodiment.

An embodiment, which is an example of the present invention, will be described below with reference to the drawings. In the following description, the direction of arrow F shown in FIGS. 1 and 2 is “front of the vehicle” and the direction of arrow B is “back of the vehicle” with respect to the body of a riding mower (an example of “electric work vehicle”). 1, the direction of arrow U shown in FIG. 1 is "upper body", the direction of arrow D is "lower body", the direction of arrow L shown in FIG. 2 is "left body", and the direction of arrow R is "right body". People”.

[About the riding-type mower]
As shown in FIGS. 1 and 2, a riding-type mower is equipped with a pair of left and right front wheels 1 as a traveling device capable of swinging and steering, and a pair of left and right rear wheels 2 as a traveling device can be driven. A riding type vehicle body is provided which is provided with a driver's seat 3 and a driver 5 having a steering wheel 4 for steering the front wheels 1. A traveling motor 6 (an example of “electric motor”), which is an electric motor that drives the left and right rear wheels 2, is provided below the driver's seat 3.

A grass mowing device 7 for mowing grass and grass is provided between the front wheel 1 and the rear wheel 2. The mowing device 7 is supported on the vehicle body via a link mechanism 8 which is supported on the vehicle body so as to be capable of swinging up and down. The mowing device 7 is vertically moved by a lifting operation of the link mechanism 8 in a descending working state in which the gauge wheel 7a is in contact with the ground and a non-working state in which the gauge wheel 7a is lifted from the ground. A work motor 9 (an example of an “electric motor”) that is an electric motor that drives the mowing device 7 is provided in a portion of the vehicle body that is on the front side of the mowing device 7. A battery 10 that supplies electric power to the traveling motor 6 and the work motor 9 is provided in a portion of the vehicle body on the front side of the steering wheel 4.

A grass container 11 is connected to the rear part of the vehicle body. A transport duct 12 is provided between the cut grass discharging portion of the grass mowing device 7 and the grass cutting inlet of the grass container 11. The transport duct 12 is provided so as to pass between the left rear wheel 2 and the right rear wheel 2 below the vehicle body. In the mowing device 7, a rotary cutting blade (not shown) provided inside the cutting blade housing 7b cuts grass and lawn. The cut grass and grass (hereinafter, grass and grass are collectively referred to as grass) that has been cut off is sent to the transport duct 12 by the transport wind generated by the rotation of the rotary cutting blade, and the grass is collected by the transport duct 12. It is transported to 11 and stored in the grass container 11.

As shown in FIG. 1, a pair of left and right elevating and lowering link mechanisms 14 configured to be vertically swingable are provided on both lateral sides of the grass container 11 in a rearward direction of the vehicle body from a support frame 13 erected at a rear portion of the vehicle body. It has been extended. The grass container 11 is supported by the extended end portions of the pair of left and right lifting link mechanisms 14 via the pair of left and right swing link mechanisms 15. A discharge port 11a and a lid 16 that opens and closes the discharge port 11a are provided at the rear of the grass container 11. The lid 16 is supported by the grass container 11 in a swingable state around a rotation axis in the lateral direction of the vehicle body.

The grass collection container 11 is lifted and lowered by a vertical swing of a pair of left and right lifting link mechanisms 14 in a descending storage position in which the grass cutting port communicates with the transport duct 12 and in a rising position in which the grass cutting port is separated from the transport duct 12 to the upper side. Operated. Further, the grass container 11 is rockably operated between the ascending posture and the discharging posture by the rotational swing of the pair of left and right swing link mechanisms 15. The raised posture is a posture in which the discharge port 11a of the grass container 11 faces rearward and the lid 16 is closed. The discharging posture is a posture in which the discharge port 11a of the grass container 11 faces downward and the lid 16 is opened. By raising and lowering the grass collection container 11 and swinging it to the discharge position, the grass cut in the grass collection container 11 is discharged from the discharge port 11a by spontaneous fall.

[Structure for operating mowing device and collecting container]
As shown in FIGS. 1 and 2, the first hydraulic cylinder 45 is connected to the link mechanism 8 of the mowing device 7. By operating the link mechanism 8 to move up and down by expanding and contracting the first hydraulic cylinder 45, the grass mowing device 7 is moved up and down in a descending working state and a rising non-working state.

As shown in FIGS. 1 and 2, a second hydraulic cylinder 46 is connected to each of the lifting link mechanisms 14 on both sides of the grass container 11. The left and right lifting link mechanisms 14 are moved up and down by the expansion and contraction operations of the respective second hydraulic cylinders 46, so that the grass container 11 is moved up and down between the lowered storage posture and the raised posture.

As shown in FIGS. 1 and 2, a third hydraulic cylinder 47 is connected to each of the swing link mechanisms 15 on both sides of the grass container 11. By swinging the left and right swing link mechanisms 15 by expanding and contracting the respective third hydraulic cylinders 47, the grass collection container 11 is swingable between a rising posture and a discharging posture.

[Hydraulic system]
The riding-type mower of the present embodiment includes a hydraulic system 40 (an example of "working oil supply section") shown in FIG. The hydraulic system 40 supplies hydraulic oil to the first hydraulic cylinder 45, the second hydraulic cylinder 46, and the third hydraulic cylinder 47. The first hydraulic cylinder 45, the second hydraulic cylinder 46, and the third hydraulic cylinder 47 are examples of “hydraulic cylinder”.

The hydraulic system 40 includes an operation valve device 54. The operation valve device 54 has a first operation valve 49, a second operation valve 51, and a third operation valve 53. A first operation valve 49 is connected to the first hydraulic cylinder 45 via an operation circuit 48. A second operation valve 51 is connected to the left and right second hydraulic cylinders 46 via an operation circuit 50. A third operation valve 53 is connected to the left and right third hydraulic cylinders 47 via an operation circuit 52.

The pump port 54p of the operation valve device 54 and the oil takeout portion 55a of the mission case 55 are connected by an oil supply passage 57 having a hydraulic pump 56. The transmission case 55 accommodates a transmission (not shown) that transmits the power of the traveling motor 6 to the left and right rear wheels 2. The tank port 54t of the operation valve device 54 and the oil return portion 55b of the mission case 55 are connected by an oil discharge passage 58.

The lubricating oil stored in the mission case 55 is supplied to the operation valve device 54 by the hydraulic pump 56.

By operating the first operation valve 49, the lubricating oil supplied to the operation valve device 54 is supplied to the first hydraulic cylinder 45 as hydraulic oil, and is discharged from the first hydraulic cylinder 45. The hydraulic cylinder 45 can be expanded and contracted.

By operating the second operation valve 51, the lubricating oil supplied to the operation valve device 54 is supplied to the left and right second hydraulic cylinders 46 as hydraulic oil and is discharged from the left and right second hydraulic cylinders 46. Thus, the left and right second hydraulic cylinders 46 can be expanded and contracted.

By operating the third operation valve 53, the lubricating oil supplied to the operation valve device 54 is supplied to the left and right third hydraulic cylinders 47 as operating oil and is drained from the left and right third hydraulic cylinders 47. Thus, the left and right third hydraulic cylinders 47 can be expanded and contracted.

In the present embodiment, the hydraulic system 40 includes an oil temperature circuit 60A (an example of “heating unit”). The oil temperature circuit 60A circulates the lubricating oil stored in the mission case 55 between the mission case 55 and the traveling motor 6 and the work motor 9 by the feeding action of the hydraulic pump 56, so that the lubricating oil, that is, each hydraulic cylinder. The hydraulic oil is heated.

Specifically, the oil temperature circuit 60A discharges the lubricating oil stored in the mission case 55 from the hydraulic pump 56 and supplies the lubricating oil to the operation valve device 54, and the power beyond port 54b of the operation valve device 54. The first oil passage 61 for supplying the lubricating oil to the working motor 9, the second oil passage 62 for supplying the lubricating oil discharged from the working motor 9 to the traveling motor 6, and the discharging oil from the traveling motor 6. A return oil passage 63 for returning the lubricating oil to the mission case 55 is provided.

Around the work motor 9, a heat exchange jacket (not shown) through which the lubricating oil supplied from the first oil feed passage 61 to the work motor 9 flows is provided. The lubricating oil flowing through the inside of the heat exchange jacket is heated by the heat generated from the work motor 9 and is discharged to the second oil feeding passage 62.

Around the traveling motor 6, a heat exchange jacket (not shown) through which the lubricating oil supplied from the second oil feed passage 62 to the traveling motor 6 flows is provided. The lubricating oil flowing through the inside of the heat exchange jacket is heated by the heat generated from the traveling motor 6 and discharged to the return oil passage 63.

In the riding mower, a work inverter 65 that supplies the electric power of the battery 10 to the work motor 9, a travel inverter 66 that supplies the electric power of the battery 10 to the travel motor 6 (an example of an “electric power supply unit”), Is provided. FIG. 3 shows a charger 64 for charging the battery 10.

[Control part]
The control block diagram of FIG. 4 shows a control system provided in this riding-type mower. Various signals are input to the control unit 70 via the input signal processing unit 81. The control unit 70 controls the operating device by sending various control signals via the device control unit 82. The operating devices include various devices incorporated in the riding mower, such as the operation valve device 54, the hydraulic pump 56, the work inverter 65, the traveling inverter 66, the braking mechanism 68, and the notification mechanism 69.

Signals from the traveling operation tool 85, the work operation tool 86, and the heating switch 87 are input to the input signal processing unit 81. Further, the input signal processing unit 81 detects the temperature sensor 9a for detecting the temperature of the work motor 9, the temperature sensor 6a for detecting the temperature of the traveling motor 6, and the temperature of the lubricating oil (work oil) in the mission case 55. Signals from various sensors and switches such as the temperature sensor 55c are input. Further, the input signal processing unit 81 receives a signal from the battery 10 indicating whether or not the battery 10 is being charged.

The traveling operation tool 85 is a general term for devices used by a driver to operate an operation device related to traveling, and includes the steering wheel 4, the accelerator pedal 18, and the like. The driving speed of the rear wheels 2 is adjusted by operating the traveling operation tool 85. The work operation tool 86 is a general term for devices used by a driver to operate the work device, and includes an elevating lever for the mowing device 7 and the grass collection container 11, an operation switch for the mowing device 7, and the like.

The warming switch 87 is a switch operated by the driver to operate the hydraulic system 40 and execute an oil temperature adjusting operation described later.

The braking mechanism 68 connected to the device control unit 82 is a mechanism for braking the front wheels 1 and the rear wheels 2, and is a general term for brakes and parking brakes.

The notification mechanism 69 connected to the device control unit 82 notifies the driver of various events occurring in the riding type mower, and is a general term for a lamp, a buzzer, a speaker, a display, and the like.

The control unit 70 includes a traveling control unit 71, a work control unit 72, a heating control unit 73 (an example of a “control unit”), and a notification control unit 74.

The traveling control unit 71 outputs a control signal for operating the traveling inverter 66 and the braking mechanism 68 via the device control unit 82 based on a command from the traveling operation tool 85.

The work control unit 72 generates a control command to the work device based on the command from the work operation tool 86, and outputs the control command to the operation valve device 54, the work inverter 65, and the like via the device control unit 82.

The heating control unit 73 executes an oil temperature adjusting operation. The oil temperature adjusting operation is an operation of controlling the hydraulic system 40 to heat the lubricating oil (operating oil). This will be described in detail below.

The heating control unit 73 gives a notification command to the notification control unit 74 based on the temperature of the lubricating oil in the mission case 55 detected by the temperature sensor 55c. For example, the heating control unit 73 gives a notification command to the notification control unit 74 when the temperature of the lubricating oil in the mission case 55 is equal to or lower than the predetermined first threshold value. The notification control unit 74 outputs a control signal for operating the notification mechanism 69 via the device control unit 82 based on the given notification command. The notification mechanism 69 notifies the driver that the temperature of the lubricating oil is low, based on the control signal.

The heating control unit 73 starts the oil temperature adjusting operation in response to receiving the signal indicating that the heating switch 87 is turned on via the input signal processing unit 81. Specifically, the heating control unit 73 gives a braking energization command to the traveling control unit 71, and gives a pump operation command to the work control unit 72. The traveling control unit 71 outputs a control signal for operating the braking mechanism 68 via the device control unit 82 based on the supplied braking energization command, and a control signal for operating the traveling motor 6 via the device control unit 82. Output. As a result, electric power is supplied to the traveling motor 6 in a state where the braking mechanism 68 operates and the riding type mower is stopped, and the traveling motor 6 generates heat. The work control unit 72 outputs a control signal for operating the hydraulic pump 56 via the device control unit 82 based on the given pump operation command. As a result, the lubricating oil of the mission case 55 flows through the oil supply passage 57, the first oil supply passage 61, the second oil supply passage 62, and the return oil passage 63, and is heated by the traveling motor 6.

The heating control unit 73 ends the oil temperature adjustment operation based on the temperature of the lubricating oil in the mission case 55 detected by the temperature sensor 55c. Specifically, in response to the temperature of the lubricating oil in the mission case 55 exceeding a predetermined second threshold value, a notification command is given to the notification control unit 74, a braking energization end command is given to the traveling control unit 71, and work is performed. A pump operation end command is given to the control unit 72.

The notification control unit 74 outputs a control signal for operating the notification mechanism 69 via the device control unit 82 based on the given notification command. The notification mechanism 69 notifies the driver that the temperature of the lubricating oil has exceeded a predetermined temperature based on the control signal.

The traveling control unit 71 outputs a control signal for terminating the operation of the braking mechanism 68 via the device control unit 82 based on the applied braking energization termination command, and outputs a control signal for stopping the traveling motor 6 to the device control unit. Output via 82. The work control unit 72 outputs a control signal for stopping the hydraulic pump 56 via the device control unit 82 based on the given pump operation end command.

[Other Embodiments]
(1) FIG. 5 is a circuit diagram showing a hydraulic system 40 including an oil temperature circuit 60B (an example of a "heating unit") different from the oil temperature circuit 60A of the above embodiment. The oil temperature circuit 60B includes an oil feed passage 93 that takes out the lubricating oil of the transmission case 55 by the hydraulic pump 92 and supplies it to the traveling motor 6, and an oil feed passage that supplies the lubricating oil discharged from the traveling motor 6 to the work motor 9. 94 and a return oil passage 95 for returning the lubricating oil discharged from the work motor 9 to the mission case 55. The return oil passage 95 is connected to an oil discharge passage 96 that returns the lubricating oil (working oil) discharged from the power beyond port 54 b of the operation valve device 54 to the mission case 55.

In the present embodiment, in the oil temperature adjusting operation, the work control unit 72 outputs a control signal for operating the hydraulic pump 92 via the device control unit 82 based on the given pump operation command. As a result, the lubricating oil of the mission case 55 flows through the oil feed passage 93, the oil feed passage 94, and the return oil passage 95, and is heated by the traveling motor 6.

(2) In the above embodiment, the example in which the heating control unit 73 starts the oil temperature adjusting operation in response to receiving the signal indicating that the heating switch 87 is turned on has been described. The oil temperature adjusting operation may be automatically executed without the driver's operation of the heating switch 87.

For example, the heating control unit 73 may execute the oil temperature adjustment operation based on the temperature of the lubricating oil of the mission case 55 detected by the temperature sensor 55c. For example, the heating control unit 73 may execute the oil temperature adjustment operation in response to the temperature of the lubricating oil in the mission case 55 being equal to or lower than the predetermined first threshold value.

For example, the heating control unit 73 performs an oil temperature adjustment operation in response to the temperature of the lubricating oil in the mission case 55 being equal to or lower than a predetermined first threshold value at a preset use start time (for example, 9:00 am). May be executed. According to the present embodiment, even when the temperature is low, the oil temperature adjusting operation is automatically executed at the use start time, so that the working oil supplied to the hydraulic cylinder can have an appropriate temperature and viscosity. it can. That is, the working device can be immediately activated at the use start time by using the hydraulic cylinder, so that the convenience of the riding mower can be enhanced.

For example, the heating control unit 73 may execute the oil temperature adjustment operation while the battery 10 is being charged. For example, a signal indicating that the battery 10 is being charged is input from the battery 10, and a signal indicating that the temperature of the lubricating oil in the mission case 55 is below a predetermined first threshold value is input from the temperature sensor 55c. In response to this, the heating control unit 73 executes the oil temperature adjusting operation.

(3) In the above embodiment, the example in which the oil temperature adjusting operation is ended when the temperature of the lubricating oil in the mission case 55 exceeds the predetermined second threshold value has been described. The heating control unit 73 may be configured to end the oil temperature adjusting operation in response to the lapse of a predetermined time from the start of the oil temperature adjusting operation.

(4) In the above embodiment, in the oil temperature adjusting operation, an example in which electric power is supplied to the traveling motor 6 and the traveling motor 6 generates heat in a state where the braking mechanism 68 operates and the riding-type mower is stopped has been described. .. In the oil temperature adjusting operation, the traveling inverter 66 may be controlled so that electric power is supplied to the traveling motor 6 to generate heat so that no rotational torque is generated. For example, the traveling inverter 66 may be controlled so as to supply the traveling motor 6 with a small amount of electric power that does not allow the riding mower to travel. In this embodiment, the oil temperature adjusting operation can be executed without operating the braking mechanism 68 while the riding-type mower is stopped.

(5) It is also possible to use the oil temperature circuit 60A (or the oil temperature circuit 60B) as a circuit for cooling the traveling motor 6 and the work motor 9. In this case, the control unit 70 may be configured as follows.

The control unit 70 includes an oil cooling control unit in addition to the travel control unit 71, the work control unit 72, the heating control unit 73, and the notification control unit 74. The oil cooling control unit executes an oil cooling operation. The oil cooling operation is an operation of controlling the hydraulic system 40 to cool the traveling motor 6 and the work motor 9.

The oil cooling control unit executes the oil cooling operation based on the temperature of the traveling motor 6 detected by the temperature sensor 6a and the temperature of the work motor 9 detected by the temperature sensor 9a. For example, the oil cooling control unit gives a notification command to the notification control unit 74 in response to at least one of the temperature of the traveling motor 6 and the temperature of the work motor 9 exceeding a predetermined third threshold value, and the work control unit 72. Give a pump operation command to.

The notification control unit 74 outputs a control signal for operating the notification mechanism 69 via the device control unit 82 based on the given notification command. The notification mechanism 69 notifies the driver that the temperature of the traveling motor 6, the work motor 9, or both is high, based on the control signal.

The work control unit 72 outputs a control signal for operating the hydraulic pump 56 via the device control unit 82 based on the given pump operation command. As a result, the lubricating oil of the mission case 55 flows through the oil supply passage 57, the first oil supply passage 61, the second oil supply passage 62, and the return oil passage 63, and the traveling motor 6 and the work motor 9 are cooled.

Then, the oil cooling control unit gives a notification command to the notification control unit 74 and pumps the work control unit 72 in response to both the temperatures of the traveling motor 6 and the work motor 9 falling below a predetermined fourth threshold value. Give a stop command.

The notification control unit 74 outputs a control signal for operating the notification mechanism 69 via the device control unit 82 based on the given notification command. The notification mechanism 69 notifies the driver that the temperatures of the traveling motor 6, the work motor 9, or both have returned to normal based on the control signal.

(6) In the above embodiment, the example in which the front wheel 1 and the rear wheel 2 are provided has been described, but it may be provided with a crawler traveling device or a semi-crawler traveling device.

(7) In the above embodiment, an example in which the riding-type mower includes the first hydraulic cylinder 45, the second hydraulic cylinder 46, and the third hydraulic cylinder 47 has been described. The riding type mower may further include a power steering hydraulic cylinder (an example of “hydraulic cylinder”) that assists the steering operation of the front wheels 1 by the steering wheel 4. Further, the riding type mower may include a front loader and a loader hydraulic cylinder (an example of “hydraulic cylinder”) for vertically moving the front loader.

The present invention can be applied to an electric work vehicle including a hydraulic cylinder and an electric motor. That is, it can be applied to a tractor, a carrier, a paddy working machine, etc., as well as a riding mower.

6: Travel motor (electric motor)
9: Working motor (electric motor)
10: Battery 40: Hydraulic system (hydraulic oil supply section)
45: 1st hydraulic cylinder (hydraulic cylinder)
46: Second hydraulic cylinder (hydraulic cylinder)
47: Third hydraulic cylinder (hydraulic cylinder)
55c: Temperature sensor 60A: Oil temperature circuit (heating part)
60B: Oil temperature circuit (heating section)
66: Traveling inverter (power supply unit)
68: Braking mechanism 69: Notification mechanism 73: Heating control unit (control unit)

Claims (8)

Hydraulic cylinder,
A hydraulic oil supply unit for supplying hydraulic oil to the hydraulic cylinder;
An electric motor,
The electric working vehicle, wherein the hydraulic oil supply unit includes a heating unit that heats the hydraulic oil using heat generated from the electric motor. A control unit that controls the hydraulic oil supply unit to execute an oil temperature adjusting operation for heating the hydraulic oil;
The electric work vehicle according to claim 1, wherein the control unit executes an oil temperature adjusting operation in accordance with an operation received by a human operation tool. A control unit that controls the hydraulic oil supply unit to execute an oil temperature adjusting operation for heating the hydraulic oil;
The electric work vehicle according to claim 1, wherein the control unit executes an oil temperature adjusting operation according to the temperature of the hydraulic oil detected by the temperature sensor. The electric work vehicle according to claim 3, further comprising an informing mechanism that provides an alarm according to the temperature of the hydraulic oil detected by the temperature sensor. A control unit that controls the hydraulic oil supply unit to perform an oil temperature adjusting operation for heating the hydraulic oil;
A battery for supplying electric power to the electric motor,
The electric work vehicle according to claim 1, wherein the control unit executes an oil temperature adjusting operation while the battery is being charged. The electric work vehicle according to claim 1, further comprising a work motor as the electric motor that drives a work device. A control unit that controls the hydraulic oil supply unit to perform an oil temperature adjusting operation for heating the hydraulic oil;
A traveling motor as the electric motor for driving a traveling device;
An electric power supply unit for supplying electric power to the traveling motor,
The electric work vehicle according to claim 1, wherein the control unit causes the power supply unit to supply electric power to the traveling motor when the oil temperature adjustment operation is performed. A braking mechanism for braking the traveling device,
The electric work vehicle according to claim 7, wherein the control unit causes the electric power supply unit to supply electric power to the traveling motor while operating the braking mechanism when executing the oil temperature adjustment operation.

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