JP7072498B2 - Electric work vehicle - Google Patents

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 raises and lowers the working machine (rotary that cultivates the field, etc.). The electric motor drives the traveling device.

Japanese Unexamined Patent Publication No. 2017-24710

The hydraulic oil supplied to the hydraulic cylinder needs to have an appropriate viscosity. In a low temperature environment, the viscosity of the hydraulic oil becomes high, and the hydraulic cylinder may not operate properly. It is conceivable to provide a heater or the like that generates heat by energization in order 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 capable of reliably operating a hydraulic cylinder even in a low temperature environment by a simple configuration.

The electric work vehicle of the present invention includes a hydraulic cylinder, a hydraulic oil supply unit that supplies hydraulic oil to the hydraulic cylinder, and an electric motor, and the hydraulic oil supply unit uses heat generated from the electric motor. The heating unit includes a heating unit that heats the hydraulic oil, a pump that sends the hydraulic oil to the heating unit, and an operation valve device that supplies the hydraulic oil to the hydraulic cylinder. The heating unit is the hydraulic oil. The oil temperature circuit directly connects the operation valve device and the electric motor, and supplies the hydraulic oil discharged from the operation valve device to the electric motor. It is characterized by having.

According to this characteristic configuration, the hydraulic oil can be heated to an appropriate temperature by using the heat generated from the electric motor, so that the hydraulic oil can be heated even in a low temperature environment by a simple configuration. The viscosity can be adjusted appropriately, and the hydraulic cylinder can be operated reliably.

In the present invention, the control unit includes a control unit that controls the hydraulic oil supply unit to execute an oil temperature adjusting operation for heating the hydraulic oil, and the control unit operates the oil temperature adjusting operation according to an operation accepted by the artificial operating tool. It is preferable to carry out.

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

In the present invention, the control unit includes a control unit that controls the hydraulic oil supply unit to execute an oil temperature adjusting operation for heating the hydraulic oil, and the control unit has an oil temperature according to the temperature of the hydraulic oil detected by the temperature sensor. It is preferable to perform the adjustment 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 a notification mechanism that performs notification according to the temperature of the hydraulic oil detected by the temperature sensor.

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

In the present invention, the control unit includes 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 the electric motor. The control unit is the battery. It is preferable to perform an oil temperature adjusting operation during charging.

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 adjusting operation is performed while the battery is being charged, sufficient electric power is stored in the battery, and it is possible to suppress shortening of the operating time of the electric work vehicle.

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

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

In the present invention, the control unit that controls the hydraulic oil supply unit to execute the oil temperature adjusting operation for heating the hydraulic oil, the traveling motor as the electric motor that drives the traveling device, and the electric power to the traveling motor. It is preferable that the control unit comprises a power supply unit for supplying electric power to the traveling motor when the oil temperature adjusting operation is executed.

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

In the present invention, the braking mechanism for braking the traveling device is provided, and when the control unit executes the oil temperature adjusting operation, the power supply unit powers the traveling motor while operating the braking mechanism. It is preferable to supply the above.

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

It is a right side view which shows the whole of a riding type mower. It is a top view which shows the whole of a 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.

Hereinafter, embodiments that are an example of the present invention will be described with reference to the drawings. In the following description, regarding the vehicle body of a passenger-type mower (an example of an "electric work vehicle"), the direction of arrow F shown in FIGS. 1 and 2 is "front of the vehicle body", and the direction of arrow B is "rear of the vehicle body". , The direction of the arrow U shown in FIG. 1 is "upward of the vehicle body", the direction of the arrow D is "downward of the vehicle body", the direction of the arrow L shown in FIG. 2 is "left of the vehicle body", and the direction of the arrow R is "right of the vehicle body". One. "

[Overall passenger-type mower]
As shown in FIGS. 1 and 2, the passenger-type mower is equipped with a pair of left and right front wheels 1 as a traveling device so as to be able to swing and steer, and a pair of left and right rear wheels 2 as a traveling device can be driven. It is equipped with a passenger-type vehicle body in which a driver's seat 3 and a driver's unit 5 having a steering wheel 4 for steering and operating the front wheels 1 are formed. Below the driver's seat 3, a traveling motor 6 (an example of an "electric motor"), which is an electric motor for driving the left and right rear wheels 2, is provided.

A grass cutting device 7 for cutting grass and lawn is provided between the front wheel 1 and the rear wheel 2. The mowing device 7 is supported by the vehicle body via a link mechanism 8 that is supported by the vehicle body so as to be able to swing up and down. The mowing device 7 is moved up and down by the ascending / descending operation of the link mechanism 8 so as to be in a descending working state in which the gauge wheel 7a touches the ground and in an ascending non-working state in which the gauge ring 7a rises from the ground. A work motor 9 (an example of an "electric motor"), which is an electric motor for driving the mowing device 7, is provided in a portion of the vehicle body in front of the mowing device 7. A battery 10 for supplying electric power to the traveling motor 6 and the working motor 9 is provided in a portion of the vehicle body in front of the steering wheel 4.

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

As shown in FIG. 1, a pair of left and right elevating link mechanisms 14 configured to be vertically swingable are provided on both sides of the grass collecting container 11 from the support frame 13 erected at the rear of the vehicle body toward the rear of the vehicle body. It has been postponed. The grass collecting container 11 is supported by the extending end portion of the pair of left and right elevating link mechanisms 14 via the pair of left and right rocking link mechanisms 15. A discharge port 11a and a lid 16 for opening and closing the discharge port 11a are provided at the rear of the grass collecting container 11. The lid 16 is supported by the grass collecting container 11 in a state where it can swing about a rotation axis in the width direction of the vehicle body.

The grass collecting container 11 moves up and down over a downward storage posture in which the grass feeding port communicates with the transport duct 12 and an ascending posture in which the grass feeding port moves upward from the transport duct 12 by raising and lowering the pair of left and right link mechanisms 14. Be manipulated. Further, the grass collecting container 11 is oscillated over the ascending posture and the discharging posture by the rotational oscillating of the pair of left and right oscillating link mechanisms 15. The ascending posture is a posture in which the discharge port 11a of the grass collecting container 11 faces rearward and the lid 16 is closed. The discharge posture is a posture in which the discharge port 11a of the grass collecting container 11 faces downward and the lid 16 is open. By raising the grass collecting container 11 to the ascending posture and swinging it to the discharging posture, the grass stored in the grass collecting container 11 is discharged from the discharge port 11a by free fall.

[Configuration to operate the grass cutting device and grass 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 moving the link mechanism 8 up and down by the expansion and contraction operation of the first hydraulic cylinder 45, the mowing device 7 is configured to be moved up and down between the lowering work state and the ascending non-working state.

As shown in FIGS. 1 and 2, a second hydraulic cylinder 46 is connected to each of the elevating link mechanisms 14 on both lateral sides of the grass collecting container 11. By moving the left and right elevating link mechanisms 14 up and down by the expansion and contraction operation of the respective second hydraulic cylinders 46, the grass collecting container 11 is configured to be elevated and lowered over the lowering storage posture and the ascending 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 lateral sides of the grass collecting container 11. By swinging the left and right swing link mechanisms 15 by expanding and contracting the respective third hydraulic cylinders 47, the grass collecting container 11 is configured to swing over the ascending posture and the discharging posture.

[Hydraulic system]
The passenger-type mower of the present embodiment is provided with a hydraulic system 40 (an example of a “ hydraulic oil supply unit”) 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 cylinders".

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 operating valve 49 is connected to the first hydraulic cylinder 45 via an operating 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 take-out portion 55a of the mission case 55 are connected by an oil supply passage 57 having a hydraulic pump 56. The transmission case 55 houses 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 drainage 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 operating valve 49, the lubricating oil supplied to the operating valve device 54 is supplied to the first hydraulic cylinder 45 as hydraulic oil, and is discharged from the first hydraulic cylinder 45, so that the first operation valve 49 is operated. 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 as hydraulic oil to the left and right second hydraulic cylinders 46, and is discharged from the left and right second hydraulic cylinders 46. 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 as hydraulic oil to the left and right third hydraulic cylinders 47, and is discharged from the left and right third hydraulic cylinders 47. 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 a “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 working motor 9 by the feeding action of the hydraulic pump 56, and the lubricating oil, that is, each hydraulic cylinder. It heats the hydraulic oil.

Specifically, the oil temperature circuit 60A discharges the lubricating oil stored in the mission case 55 from the oil supply passage 57, which is taken out by the hydraulic pump 56 and supplied to the operation valve device 54, and the power beyond port 54b of the operation valve device 54. A first oil feed passage 61 (corresponding to the oil feed passage of the present invention) for supplying the lubricating oil to be supplied to the work motor 9, and a second oil feed passage for supplying the lubricating oil discharged from the work motor 9 to the traveling motor 6. A return oil passage 63 for returning the lubricating oil discharged from the traveling motor 6 to the mission case 55 is provided.

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

Around the traveling motor 6, a heat exchange jacket (not shown) is provided around which the lubricating oil supplied from the second oil feed passage 62 to the traveling motor 6 passes through the inside. 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.

The passenger-type mower includes a work inverter 65 that supplies the electric power of the battery 10 to the work motor 9, a traveling inverter 66 that supplies the electric power of the battery 10 to the traveling motor 6 (an example of the "power supply unit"). Is provided. FIG. 3 shows a charger 64 for charging the battery 10.

[Control unit]
The control block diagram of FIG. 4 shows a control system included in this passenger-type mower. Various signals are input to the control unit 70 via the input signal processing unit 81. The control unit 70 controls an operating device by sending various control signals via the device control unit 82. This operating device includes various devices incorporated in a passenger-type mower, such as an operation valve device 54, a hydraulic pump 56, a work inverter 65, a traveling inverter 66, a braking mechanism 68, and a 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 of 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 (working oil) in the mission case 55. Signals from various sensors and switches such as the temperature sensor 55c are input. Further, a signal indicating whether or not the battery 10 is being charged is input from the battery 10 to the input signal processing unit 81.

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

The heating switch 87 is a switch operated by the driver to operate the hydraulic system 40 to execute the 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 this passenger-type mower, and is a general term for lamps, buzzers, speakers, displays, and the like.

The control unit 70 includes a travel 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 travel control unit 71 outputs a control signal for operating the travel inverter 66 and the braking mechanism 68 via the device control unit 82 based on a command from the travel controller 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, etc. 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 (hydraulic 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 of 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 according to the temperature of the lubricating oil of the mission case 55 being equal to or lower than a 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 a signal indicating that the heating switch 87 has been 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 a pump operation command to the work control unit 72. The travel control unit 71 outputs a control signal for operating the braking mechanism 68 via the equipment control unit 82 based on the given braking energization command, and outputs a control signal for operating the travel motor 6 via the equipment control unit 82. And output. As a result, electric power is supplied to the traveling motor 6 in a state where the braking mechanism 68 is operated and the passenger-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 equipment control unit 82 based on the given pump operation command. As a result, the lubricating oil of the mission case 55 passes 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 adjusting operation based on the temperature of the lubricating oil of the mission case 55 detected by the temperature sensor 55c. Specifically, when the temperature of the lubricating oil in the mission case 55 exceeds 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 travel control unit 71 outputs a control signal for terminating the operation of the braking mechanism 68 via the equipment control unit 82 based on the given braking energization end command, and outputs a control signal for stopping the travel motor 6 to the equipment control unit. Output via 82. The work control unit 72 outputs a control signal for stopping the hydraulic pump 56 via the equipment 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 provided with 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 has an oil feed passage 93 for taking out the lubricating oil of the mission case 55 by the hydraulic pump 92 and supplying it to the traveling motor 6, and an oil feeding passage for supplying the lubricating oil discharged from the traveling motor 6 to the working motor 9. It is provided with 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 (hydraulic oil) discharged from the power beyond port 54b 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 equipment control unit 82 based on the given pump operation command. As a result, the lubricating oil of the mission case 55 passes 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, an example has been described in which the heating control unit 73 starts the oil temperature adjusting operation in response to receiving a signal indicating that the heating switch 87 has been turned on. The oil temperature adjusting operation may be automatically executed regardless of the operation of the heating switch 87 by the driver.

For example, the heating control unit 73 may execute the oil temperature adjusting 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 adjusting operation according to the temperature of the lubricating oil of the mission case 55 being equal to or less than a predetermined first threshold value.

For example, the heating control unit 73 operates to adjust the oil temperature according to the temperature of the lubricating oil of 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 this embodiment, even when the temperature is low, the oil temperature adjustment operation is automatically executed at the start time of use, and the hydraulic oil supplied to the hydraulic cylinder has an appropriate temperature and viscosity. can. That is, since the working device can be immediately operated at the start time of use by using the hydraulic cylinder, the convenience of the riding type mower can be enhanced.

For example, the heating control unit 73 may execute the oil temperature adjusting operation while charging the battery 10. 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 equal to or lower than 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, an example of terminating the oil temperature adjusting operation according to the temperature of the lubricating oil of the mission case 55 exceeding a predetermined second threshold value has been described. The heating control unit 73 may be configured to end the oil temperature adjusting operation when a predetermined time has elapsed from the start of the oil temperature adjusting operation.

(4) In the above embodiment, an example has been described in which power is supplied to the traveling motor 6 in a state where the braking mechanism 68 is operated and the passenger-type mower is stopped in the oil temperature adjusting operation, and the traveling motor 6 generates heat. .. In the oil temperature adjusting operation, the traveling inverter 66 may be controlled so as to supply electric power to the traveling motor 6 to generate heat so that rotational torque is not 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 so that the passenger-type mower does not travel. In this embodiment, the oil temperature adjusting operation can be executed with the passenger-type mower stopped without operating the braking mechanism 68.

(5) The oil temperature circuit 60A (or oil temperature circuit 60B) can also be used as a circuit for cooling the traveling motor 6 and the working 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 working 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 working 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 the fact that at least one of the temperature of the traveling motor 6 and the temperature of the work motor 9 exceeds a predetermined third threshold value, and the work control unit 72. Gives 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 working 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 equipment control unit 82 based on the given pump operation command. As a result, the lubricating oil of the mission case 55 passes 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 the fact that both the temperature of the traveling motor 6 and the temperature of the work motor 9 fall below a predetermined fourth threshold value. Gives an operation 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 temperature of the traveling motor 6, the working motor 9, or both has 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 is shown, but a crawler traveling device or a semi-crawler traveling device may be provided.

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

The present invention is applicable to an electric work vehicle including a hydraulic cylinder and an electric motor. That is, it can be applied not only to passenger-type mowers, but also to tractors, transport vehicles, paddy field work machines, and the like.

6: Traveling motor (electric motor)
9: Work motor (electric motor)
10: Battery 40: Hydraulic system (hydraulic oil supply unit)
45: First 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 part)
61: First oil feed channel (oil feed channel)
66: Traveling inverter (power supply unit)
68: Braking mechanism 69: Notification mechanism 73: Heating control unit (control unit)

Claims (8)

With a hydraulic cylinder,
A hydraulic oil supply unit that supplies hydraulic oil to the hydraulic cylinder, and
Equipped with an electric motor,
The hydraulic oil supply unit includes a heating unit that heats the hydraulic oil using heat generated from the electric motor.
A pump that sends the hydraulic oil to the heating unit,
The hydraulic cylinder is provided with an operation valve device for supplying the hydraulic oil.
The heating unit is an oil temperature circuit that heats the hydraulic oil.
The oil temperature circuit is an electric work vehicle including an oil supply passage that directly connects the operation valve device and the electric motor and supplies the hydraulic oil discharged from the operation valve device to the electric motor . A control unit for controlling the hydraulic oil supply unit to execute an oil temperature adjusting operation for heating the hydraulic oil is provided.
The electric work vehicle according to claim 1, wherein the control unit executes an oil temperature adjusting operation according to an operation received by the artificial operating tool. A control unit for controlling the hydraulic oil supply unit to execute an oil temperature adjusting operation for heating the hydraulic oil is provided.
The electric work vehicle according to claim 1 or 2, 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 a notification mechanism that notifies according to the temperature of the hydraulic oil detected by the temperature sensor. A control unit that controls the hydraulic oil supply unit and executes an oil temperature adjusting operation to heat the hydraulic oil, and a control unit.
Equipped with a battery that supplies power to the electric motor,
The electric work vehicle according to any one of claims 1 to 4, wherein the control unit executes an oil temperature adjusting operation while charging the battery. The electric work vehicle according to any one of claims 1 to 5, further comprising a work motor as the electric motor for driving a work device. A control unit that controls the hydraulic oil supply unit and executes an oil temperature adjusting operation to heat the hydraulic oil, and a control unit.
The traveling motor as the electric motor that drives the traveling device,
A power supply unit that supplies electric power to the traveling motor is provided.
The electric work vehicle according to any one of claims 1 to 6, wherein the control unit causes the power supply unit to supply electric power to the traveling motor when the oil temperature adjusting operation is executed. A braking mechanism for braking the traveling device is provided.
The electric work vehicle according to claim 7, wherein the control unit supplies electric power to the traveling motor to the power supply unit while operating the braking mechanism when the oil temperature adjusting operation is executed.

Images