JP2012065480A - Wire storage device and vehicle loading the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make drawing force when a power receiving cord is drawn from a cord reel to be constant.SOLUTION: A cord reel 600 for storing a power receiving cord 250 for transmitting power includes: a drum 610; a spring device 660; and a resistance adding device 630. The power receiving cord 250 is wound around the drum 610 in the case of storage. The spring device 660 is attached to the drum 610 and gives winding torque for winding the power receiving cord 250 to the drum 610. The resistance adding device 630 can variably adjust resistance force to rotation of the drum 610. The resistance adding device 630 adjusts the resistance force so that torque required for drawing out the power receiving cord 250 from the drum 610 becomes almost constant.

Description

  The present invention relates to an electric wire storage device and a vehicle equipped with the electric wire storage device, and more particularly to control of a cord drawing torque stored in the electric wire storage device.

  2. Description of the Related Art In recent years, attention has been paid to a vehicle that is mounted with a power storage device (for example, a secondary battery or a capacitor) and travels using driving force generated from electric power stored in the power storage device as an environment-friendly vehicle. Such vehicles include, for example, electric vehicles, hybrid vehicles, fuel cell vehicles, and the like. And the technique which charges the electrical storage apparatus mounted in these vehicles with a commercial power source with high electric power generation efficiency is proposed.

  Also in a hybrid vehicle, a vehicle capable of charging an in-vehicle power storage device (hereinafter also referred to as “external charging”) from a power source outside the vehicle (hereinafter also simply referred to as “external power source”) as in the case of an electric vehicle. Are known. For example, there is a so-called “plug-in hybrid vehicle” that can charge a power storage device from a general household power source by connecting a power outlet provided in a house to a charging port provided in a vehicle with a power receiving cord. It has been. This can be expected to increase the fuel consumption efficiency of the hybrid vehicle.

  In external charging using such a power receiving cord, an electric wire storage device (for example, a cord reel) for winding and storing the power receiving cord may be used when external charging is not performed.

  Japanese Patent Laying-Open No. 2010-077561 (Patent Document 1) discloses a vacuum cleaner having a configuration in which a rotating shaft of a cord reel for winding a power receiving cord is directly connected to a driving motor via an electromagnetic clutch. The In this vacuum cleaner, the clutch is turned on when the plug of the power receiving cord is connected to the outlet, while the clutch is turned off when the plug of the power receiving cord is not connected to the outlet. When the power receiving cord is pulled out, it is possible to prevent the pulling output from increasing due to the driving motor and deteriorating usability.

JP 2010-075611 A JP 2002-226143 A JP-A-9-327422 Japanese Patent Publication No. 61-33779

  In such a cord reel, the power receiving cord is wound in order to wind up the power receiving cord and to prevent the power receiving cord from being loosened when the power receiving cord is pulled out and wound. A force may be applied to the drum in a direction in which the power receiving cord is wound by a spring or the like.

  In this case, the force in the winding direction varies as the cable is pulled out. Thus, if the power output is not constant when the power receiving cable is pulled out, the user may feel uncomfortable.

  In the configuration of Japanese Patent Application Laid-Open No. 2010-075611 (Patent Document 1), an increase in the output power of the power receiving cord due to the coupling with the driving motor is suppressed, but the power output is reduced when the power receiving cord is pulled out. It was not considered about making it constant.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a cord reel capable of making the output power of the power receiving cord constant.

  The electric wire storage device according to the present invention includes a drum, an elastic mechanism, and a resistance adding device, and stores a cord for transmitting electric power. The drum is wound around a cord when stored. The elastic mechanism is attached to the drum and provides a winding torque for winding the cord around the drum. The resistance adding device is configured to variably adjust the resistance force against the rotation of the drum. The resistance adding device adjusts the resistance so that the torque required when the cord is pulled out from the drum becomes substantially constant.

  Preferably, the elastic mechanism is configured such that the winding torque increases as the cord is pulled out. The resistance adding device adjusts the resistance according to the amount of the cord drawn out.

  Preferably, the resistance adding device adjusts the resistance so that a torque corresponding to a difference between a predetermined reference torque and a winding torque is generated.

  Preferably, the resistance adding device is engaged with the gear mechanism rotated with the rotation of the drum, and adjusts the resistance force by changing the contact pressure with the drum with the rotation of the drum. The contact part comprised in this.

  Preferably, the resistance adding device includes a cylinder having a rod configured to be able to apply a pressing force to the drum. The cylinder adjusts the resistance force by changing the pressing force between the rod and the drum as the drum rotates.

  Preferably, the resistance adding device includes a friction engagement device having at least one of a clutch and a brake. The friction engagement device adjusts the resistance force by changing the engagement force as the drum rotates.

  Preferably, the resistance adding device includes an electric motor for supplying rotational torque to the drum. The electric motor adjusts the resistance force by changing the rotational torque as the drum rotates.

  Preferably, the electric wire storage device further includes a generator that generates electric power by drawing the cord and rotating the drum.

  Preferably, the electric wire storage device further includes a battery for charging the electric power generated by the generator.

  Preferably, the electric wire storage device further includes a notification device for notifying the operator of a state related to the drawing of the cord using the electric power generated by the generator.

  A vehicle according to the present invention is a vehicle equipped with a power storage device that can be charged using electric power from an external power source, a cord for transmitting power from the external power source to the power storage device, and a cord for storing the cord A wire storage device. The electric wire storage device includes a drum around which a cord is wound when stored, an elastic mechanism, and a resistance adding device. The elastic mechanism is attached to the drum and provides a winding torque for winding the cord around the drum. The resistance adding device is configured to variably adjust the resistance force against the rotation of the drum. The resistance adding device adjusts the resistance so that the torque required when the cord is pulled out from the drum becomes substantially constant.

  According to the present invention, it is possible to make the pull output when the power receiving cord is pulled out from the cord reel constant.

1 is an overall block diagram of a vehicle on which a cord reel according to the present embodiment is mounted. It is the schematic of the cord reel according to this Embodiment. It is a figure for demonstrating the change of the extraction torque by an elastic device at the time of pulling out the power receiving cable. It is a figure for demonstrating the outline | summary of the pull output constant control in this Embodiment. It is a figure which shows a part of AA cross section in FIG. It is a figure which shows a part of BB cross section in FIG. It is a figure which shows the structure in the other example of a resistance addition apparatus. It is a figure which shows the structure of the further another example of a resistance addition apparatus. It is a figure which shows an example of the circuit of the control apparatus in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is an overall block diagram of a vehicle 100 on which a cord reel 600 that is an electric wire storage device according to the present embodiment is mounted.

  Referring to FIG. 1, vehicle 100 includes a power storage device 110, a system main relay (SMR), a PCU (Power Control Unit) 120 that is a driving device, a motor generator 130, and a power transmission gear 140. Drive wheel 150 and vehicle ECU (Electronic Control Unit) 300.

  The power storage device 110 is a power storage element configured to be chargeable / dischargeable. The power storage device 110 includes, for example, a secondary battery such as a lithium ion battery, a nickel metal hydride battery, or a lead storage battery, or a power storage element such as an electric double layer capacitor.

  Power storage device 110 is connected to PCU 120 via power line PL1 and ground line NL1. Then, power storage device 110 supplies power for generating driving force of vehicle 100 to PCU 120. The power storage device 110 stores the electric power generated by the motor generator 130. The output of power storage device 110 is, for example, about 200V.

  Relays included in the SMR are respectively inserted in a power line PL1 and a ground line NL1 connecting the power storage device 110 and the PCU 120. Then, SMR switches between power supply and cutoff between power storage device 110 and PCU 120 based on control signal SE <b> 1 from vehicle ECU 300.

  PCU 120 is not shown, but includes a converter for boosting the power supply voltage from power storage device 110, an inverter for converting DC power boosted by the converter into AC power for driving motor generator 130, and the like. It is comprised including.

  These converters and inverters are controlled by control signals PWC and PWI from vehicle ECU 300, respectively.

  Motor generator 130 is an AC rotating electric machine, for example, a permanent magnet type synchronous motor including a rotor in which permanent magnets are embedded.

  The output torque of motor generator 130 is transmitted to drive wheels 150 via power transmission gear 140 that includes a speed reducer and a power split mechanism, and causes vehicle 100 to travel. The motor generator 130 can generate electric power by the rotational force of the drive wheels 150 during the regenerative braking operation of the vehicle 100. Then, the generated power is converted into charging power for power storage device 110 by PCU 120.

  Although FIG. 1 shows a configuration in which one motor generator is provided, the number of motor generators is not limited to this, and a configuration in which a plurality of motor generators are provided may be employed.

  In a hybrid vehicle equipped with an engine (not shown) in addition to motor generator 130, necessary vehicle driving force is generated by operating this engine and motor generator 130 in a coordinated manner. In this case, it is also possible to charge the power storage device 110 using the power generated by the rotation of the engine.

  That is, vehicle 100 in the present embodiment indicates a vehicle equipped with an electric motor for generating vehicle driving force, and is a hybrid vehicle that generates vehicle driving force by an engine and an electric motor, or an electric vehicle and fuel not equipped with an engine. Includes battery cars.

  Vehicle ECU 300 includes a CPU (Central Processing Unit), a storage device, and an input / output buffer, all of which are not shown in FIG. 1, and inputs signals from sensors and the like and outputs control signals to devices, The vehicle 100 and each device are controlled. Note that these controls are not limited to processing by software, and can be processed by dedicated hardware (electronic circuit).

  Vehicle ECU 300 generates and outputs a control signal for controlling PCU 120, SMR, and the like. In FIG. 1, the vehicle ECU 300 is configured to have one control device. However, for example, the control unit for the PCU 120 or the control device for the power storage device 110 is individually provided for each function or for each control target device. It is good also as a structure which provides this control apparatus.

  Vehicle 100 includes an inlet 270, a charging device 200, and a relay RY2 as a configuration for charging power storage device 110 with electric power from external power supply 500A.

  Inlet 270 is provided at power receiving port 280 provided on the outer surface of vehicle 100. The power receiving port 280 is coupled with an openable / closable lid (hereinafter also referred to as “lid”) 285 for covering the inlet 270 when external charging is not performed.

  Charging connector 410 of charging cable 400 is connected to inlet 270. Then, electric power from external power source 500 </ b> A is transmitted to vehicle 100 through charging cable 400.

  In addition to charging connector 410, charging cable 400 includes a plug 420 for connecting to outlet 510 </ b> A of external power supply 500 </ b> A, and electric wire portion 430 for connecting charging connector 410 and plug 420. Note that the electric wire portion 430 may include a charging circuit interrupting device (not shown) for switching between supply and interruption of power from the external power source 500A.

  Inlet 270 is connected to charging device 200 through power lines ACL1 and ACL2.

  Vehicle 100 further includes a power receiving cord 250 and a cord reel 600 serving as an electric wire storage device as other paths for charging power storage device 110 with electric power from external power supply 500B.

  A plug 260 for connecting to the outlet 510B of the external power source 500B is connected to one end of the power receiving cord 250. The other end of power reception cord 250 is connected to power lines ACL 3 and ACL 4 connected to charging device 200.

  Further, power lines ACL3 and ACL4 are connected to power lines ACL1 and ACL2 via relay RY3. Relay RY3 is controlled by a control signal SE3 from vehicle ECU 300. Relay RY3 is electrically connected when external charging using power receiving cord 250 is performed, and is not connected when external charging using power receiving cord 250 is not performed.

  The power receiving cord 250 is wound around and stored in the cord reel 600 when external charging is not performed. Then, when external charging is performed using power receiving cord 250, the power is extracted from an outlet (not shown) of power receiving port 240 provided on the outer surface of vehicle 100. Then, when plug 260 is connected to outlet 510B, the electric power from external power supply 500B is transmitted to vehicle 100.

  FIG. 1 shows a configuration in which the charging cable 400 and the power receiving cord 250 are used, which are connected to the outlet 510A of the external power supply 500A and the outlet 510B of the external power supply 500B, respectively. And the power supply voltage of 500B may be the same voltage or different voltages. When different voltages are used, for example, the charging cable 400 may be used when the voltage of the external power supply is 200V, and the power receiving cord 250 may be used when the voltage of the external power supply is 100V.

  The power receiving port 240 is coupled with an openable / closable lid 245 for covering the outlet when external charging is not performed.

  The cord reel 600 is, for example, a drum-shaped winding device configured such that the power receiving cord 250 is wound around.

  Charging device 200 is connected to inlet 270 via power lines ACL1 and ACL2. Charging device 200 is connected to power storage device 110 through power line PL2 and ground line NL2 via relay RY2.

  Charging device 200 converts AC power supplied from inlet 270 or power receiving cord 250 into charging power for power storage device 110.

FIG. 2 is a schematic diagram of a cord reel 600 according to the present embodiment.
Referring to FIG. 2, the cord reel 600 includes a drum 610, a motor 620, a resistance adding device 630, and a control device 650.

  The drum 610 is provided with a cylindrical body, and the power receiving cord 250 is wound around the body. When external charging is performed using the power receiving cord 250, the power receiving cord 250 wound around the drum 610 is pulled out. When external charging is not performed, drum 610 winds and stores power receiving cord 250.

  An elastic device 660 is attached to the rotation shaft 612 of the drum 610. The elastic device 660 is constituted by a spiral spring as shown in FIG. 2, for example, and is configured such that a winding torque is applied to the drum 610 in a direction in which the power receiving cord 250 is wound. The shape of the elastic device 660 shown in FIG. 2 is an example, and a configuration using a spiral spring or a helical spring may be used as long as the above-described winding torque can be generated. Alternatively, the elastic device 660 may have a configuration other than a spring as long as it generates a desired elastic force, and for example, elastic rubber or the like can be used.

  The winding torque generated by the elastic device 660 is applied to wind the power receiving cord 250 around the drum 610 and to prevent the power receiving cord 250 from being loosened when the power receiving cord 250 is pulled out. The winding torque generally varies depending on the amount of the power receiving cord 250 drawn due to the characteristics of the elastic device 660.

  FIG. 3 is a graph for explaining the relationship between the drawing amount of the power receiving cord 250 and the drawing torque. As shown in FIG. 3, the drawing torque required to pull out the power receiving cord 250 increases as the amount of drawing of the power receiving cord 250 increases, that is, as the amount of rotation of the drum 610 from the stored state increases. Thus, the maximum extraction torque Tmax is obtained at the maximum extraction amount Lmax of the power receiving cord 250 (curve W1 in FIG. 3). In addition, at the time of drawing and winding, it generally has hysteresis as shown in FIG.

  However, for the user, it is preferable that the drawing torque of the power receiving cord 250 be as uniform as possible. Therefore, such fluctuations in the drawing torque may cause discomfort to the user.

  Therefore, in the present embodiment, as shown in FIG. 4, by adding a torque corresponding to the difference between the above-described maximum drawing torque Tmax and the winding torque provided by the elastic device 660, the power receiving cord 250 The pulling output constant control is performed to maintain the pulling torque substantially constant over the entire pulling amount.

  With reference to FIG. 2 again and with reference to FIGS. 5 and 6, a configuration for realizing the above-described constant output control will be described in the present embodiment. 5 is a diagram showing a part of the AA cross section in FIG. 2, and FIG. 6 is a diagram showing a part of the BB cross section in FIG.

  Gears 621 and 622 that are gear mechanisms are provided on the rotation shaft of the motor 620. The gear 621 is disposed so as to be engageable with a gear 611 provided on the side surface of the drum 610. The gear 621 rotates in response to the rotational force from the gear 611 when the power receiving cord 250 is pulled out from the drum 610. As a result, the gear 621 rotates the rotation shaft of the motor 620.

  The motor 620 generates electricity by the rotational force given by the gear 621. Then, the motor 620 transmits the generated power to the control device 650. In the control device 650, as will be described later with reference to FIG. 9, the generated power is stored in a battery, or the generated power is used for display or the like. The motor 620 may be driven using electric power supplied from the control device 650, and may be configured to be able to apply a rotational force to the drum 610.

  The number of teeth of gear 622 is set so that the gear ratio with gear 621 becomes a predetermined value. The gear 622 is configured to be engageable with the rack 631 of the resistance adding device 630, and the resistance adding device 630 is operated in a direction parallel to the rotation axis of the drum 610 by the rotation of the gear 622. In FIG. 2, the gear 622 is configured to be attached to the rotating shaft of the motor 620 in the same manner as the gear 621, but the gear 622 rotates from the gear 621 via one or more other gears. It may be configured to transmit force. Also, the configuration for operating the resistance adding device 630 may be a configuration using a bevel gear or a worm gear.

  The resistance adding device 630 is a device for applying a resistance force that opposes the rotation of the drum 610. The resistance adding device 630 is provided with a rack 631 configured to engage with the gear 622 and a pad 632 which is a contact portion for contacting the drum 610 and generating a frictional force.

  As described above, the resistance adding device 630 operates in the direction of the rotation axis of the drum 610 by pulling out and winding the power receiving cord 250. As a result, the pressing force of the pad 632 against the drum 610 changes. As shown in FIGS. 2, 5, and 6, when the power receiving cord 250 is pulled out, the resistance adding device 630 operates in a direction in which the pressing force of the pad 632 is weakened.

  Such a configuration is set so that a predetermined pressing force is urged so as to generate the maximum drawing torque Tmax as shown in FIG. 3 in a state where the power receiving cord 250 is all wound up. As a result, the pressing force by the resistance adding device is weakened as the amount of the power receiving cord 250 pulled out increases. At this time, by appropriately designing the reduction ratio between the gear 621 and the gear 622 and / or the pitch of the rack 631, the pressing force can be weakened at a predetermined rate, thereby reducing the amount of the power receiving cord 250 drawn out. Even if it changes, the required extraction torque can be maintained substantially constant.

  Note that in the resistance adding device 630, for example, a piezoelectric element (not shown) is provided at the connection portion of the pad 632 to generate a voltage corresponding to the pressing pressure, and the generated power is transmitted to the control device 650. Good. Alternatively, the pad 632 may be a roller, and power may be generated by rotating a generator (not shown) provided in the resistance adding device 630 by the rotation of the roller.

  In FIG. 2, the resistance adding device is configured to change the pressing force of the pad 632 using the rotational force of the gear 621. However, if the rotational force of the drum 610 can be increased or decreased, the configuration of the resistance adding device is as follows. It is not limited to.

  7 and 8 show other configuration examples of the resistance adding device. In FIG. 7, the example which used the cylinder as a structure which generate | occur | produces pressing force is shown. FIG. 8 shows a configuration example in which a resistance force is generated by a friction engagement device represented by a clutch or a brake.

  Referring to FIG. 7, cylinder 640 is provided as a resistance adding device 630 </ b> A on cord reel 600 </ b> A. The cylinder 640 is installed so that its rod 641 operates in a direction parallel to the rotation axis of the drum 610. A pad 642 similar to that of the resistance adding device 630 is provided at the tip of the rod 641.

  The cylinder 640 may be a cylinder such as a hydraulic cylinder or a pneumatic cylinder that operates the rod with a fluid, or may be an electric cylinder that operates the rod with an electric motor provided therein. Although not shown, the cylinder 640 is based on a signal from a distance sensor for detecting the drawing amount (drawing length) of the power receiving cord 250 or a rotation angle sensor for detecting the rotation angle of the drum 610. And driven by a control signal from the control device 650. The cylinder 640 is controlled such that the pressing force from the cylinder 640 decreases as the amount of the power receiving cord 250 pulled out increases.

  Next, referring to FIG. 8, the cord reel 600B is provided with a brake 630B as a resistance adding device. The brake 630B includes a brake disc 613 attached to the rotation shaft 612 of the drum 610, and a brake pad 614 configured to sandwich the brake disc 613.

  The brake pad 614 is driven using a fluid such as hydraulic pressure or pneumatic pressure, for example, and the amount of resistance force applied to the drum 610 is changed by changing the clamping pressure of the brake disk 613 according to the amount of the power receiving cord 250 pulled out. To change.

  In FIG. 2, the resistance force applied to the drum 610 may be changed by changing the driving force to the motor 620 in accordance with the amount of the power receiving cord 250 to be drawn.

FIG. 9 is a diagram illustrating an example of a circuit of the control device 650 in FIG.
Referring to FIG. 9, control device 650 includes a control unit 651, relays RY10 and RY11, and diodes D10 and D11.

  Relays RY10 and RY11 are connected in parallel between the positive terminal of battery 653 and the positive terminal of motor 620 included in cord reel 600. Relays RY10 and RY11 are driven according to control signals SE10 and SE11 from control unit 651, respectively.

  Diode D10 is inserted in a path connecting battery 653 and relay RY10 with the direction from battery 653 toward relay RY10 as the forward direction. Relay RY10 is closed when motor 620 is driven using the electric power from battery 653.

  Diode D11 is inserted in a path connecting battery 653 and relay RY11 with the direction from relay RY11 toward battery 653 as the forward direction. Relay RY <b> 11 is closed when battery 653 is charged with electric power generated by motor 620.

  Further, as described above, when the resistance adding device 630 is provided with the power generation device 652 such as a piezoelectric element, the power generation device 652 is connected to the anode of the diode D11. As a result, the battery 653 is charged via the diode D11 with the electric power generated by the power generation device 652.

  An indicator lamp LGT1 as a notification device is connected to the anode of the diode D11. As the indicator lamp, a lamp, an LED, or the like can be used. The indicator lamp LGT1 is turned on by the electric power generated by the motor 620 and the power generator 652. For this reason, the indicator lamp LGT1 has a high luminance when the extraction torque of the power receiving cord 250 is large, and a low luminance when the extraction torque is small. As a result, the user can be visually notified of the amount of the power receiving cord 250 withdrawn or the remaining amount of winding. Instead of or in addition to the indicator lamp LGT1, a buzzer BZ1 for audibly notifying the user may be provided.

  Alternatively, as another example of the notification device, a driver 654 connected to the battery 653 and an indicator lamp LGT2 and / or a buzzer BZ2 connected to the driver 654 may be provided. Based on the control signal SIG from the control unit 651, the driver 654 operates these indicator lamps LGT2 and buzzer BZ2 using the power from the battery 653. In the case of the above-described indicator LGT1, no notification is made because power generation is stopped when the operation of pulling out the power receiving cord 250 is stopped. However, by using such a circuit, the power receiving recognized by the control unit 651 is not performed. Since the lighting state of the indicator lamp LGT2 can be controlled based on the drawing state of the cord 250, the lighting of the indicator lamp LGT2 can be maintained even when the drawing operation of the power receiving cord 250 is stopped.

  The control unit 651 receives the rotation angle detection value ROT of the motor 620 from the rotation angle sensor 625. When the control unit 651 recognizes that the power receiving cord 250 is pulled out by the rotation angle ROT, the control unit 651 closes the contact of the relay RY11 by the control signal SE11. Thus, the battery 653 can be charged with the electric power generated by the motor 620. Further, as described above, the control signal SIG is set based on the received rotation angle ROT and output to the driver 654, thereby controlling the lighting state of the indicator lamp LGT2 based on the drawing state of the power receiving cord 250. be able to. As for the drawing state of the power receiving cord 250, for example, a signal related to the length of the power receiving cord 250 drawn out may be used or the rotation of the drum 610 may be used without using the rotation angle ROT of the motor 620. A signal related to a corner may be used.

  Control unit 651 closes the contact of relay RY10 by control signal SE10 when winding operation of power receiving cord 250 is performed by driving motor 620. As a result, the motor 620 is driven by the power from the battery 653.

  In the above description, the case where the battery 653, the driver 654, the indicator lights LGT1, LGT2, and the buzzers BZ1, BZ2 are provided in the cord reel 600 has been described. However, these devices are configured to be provided on the vehicle side. May be. Further, the function of control device 650 may be included in vehicle ECU 300.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  100 vehicle, 110 power storage device, 120 PCU, 130 motor generator, 140 power transmission gear, 150 driving wheel, 200 charging device, 240, 280 power receiving port, 245,285 lid, 250 power receiving cord, 260, 420 plug, 270 inlet , 300 vehicle ECU, 400 charging cable, 410 charging connector, 430 electric wire part, 500A, 500B external power supply, 510A, 510B outlet, 600, 600A, 600B cord reel, 610 drum, 611, 621, 622 gear, 612 rotating shaft, 613 Brake disc, 614 Brake pad, 620 Motor, 625 Rotation angle sensor, 630B Brake, 630, 630A Resistance adding device, 631 Rack, 632, 642 Pad, 640 , 641 rod, 650 control device, 651 control unit, 652 power generation device, 653 battery, 654 driver, 660 elastic device, ACL1, ACL2, ACL3, ACL4 power line, BZ1, BZ2 buzzer, D10, D11 diode, LGT1, LGT2 display Light, NL1, NL2 ground line, PL1, Pl2 power line, RY2, RY3, RY10, RY11 relay, SMR system main relay.

Claims (11)

An electric wire storage device for storing a cord for transmitting electric power,
A drum around which the cord is wound when stored;
An elastic device attached to the drum and configured to provide a winding torque for winding the cord onto the drum;
A resistance adding device configured to variably adjust a resistance force against rotation of the drum,
The resistance adding device adjusts the resistance so that a torque required when the cord is pulled out from the drum is substantially constant. The elastic device is configured such that the winding torque increases as the cord is withdrawn;
The electric wire storage device according to claim 1, wherein the resistance adding device adjusts the resistance according to a drawing amount of the cord.   The electric wire storage device according to claim 2, wherein the resistance adding device adjusts the resistance so that a torque corresponding to a difference between a predetermined reference torque and the winding torque is generated. The resistance adding device is:
A gear mechanism that is rotated as the drum rotates;
The electric wire according to claim 3, further comprising: a contact mechanism that engages with the gear mechanism and is configured to adjust the resistance force by changing a contact pressure with the drum as the drum rotates. Enclosure. The resistance adding device is:
Including a cylinder having a rod configured to be able to apply a pressing force to the drum;
4. The electric wire storage device according to claim 3, wherein the cylinder adjusts the resistance force by changing the pressing force between the rod and the drum as the drum rotates. The resistance adding device is:
A friction engagement device having at least one of a clutch and a brake,
The electric wire storage device according to claim 3, wherein the friction engagement device adjusts the resistance force by changing an engagement force with the rotation of the drum. The resistance adding device is:
Including an electric motor for supplying rotational torque to the drum;
The electric wire storage device according to claim 3, wherein the electric motor adjusts the resistance force by changing the rotational torque in accordance with the rotation of the drum.   The electric wire storage device according to claim 3, further comprising a generator that generates electricity by drawing the cord and rotating the drum.   The electric wire storage device according to claim 8, further comprising a battery for charging electric power generated by the generator.   The electric wire storage device according to claim 8, further comprising a notification device for notifying an operator of a state related to the drawing of the cord using the electric power generated by the generator. A vehicle equipped with a power storage device that can be charged using electric power from an external power source,
A cord for transmitting power from the external power source to the power storage device;
An electric wire storage device for storing the cord,
The electric wire storage device
A drum around which the cord is wound when stored;
An elastic device attached to the drum and configured to provide a winding torque for winding the cord onto the drum;
A resistance adding device configured to variably adjust a resistance force against the rotation of the drum,
The resistance adding device adjusts the resistance force so that a torque required when the cord is pulled out from the drum is substantially constant.

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