JP2015100162A - Non-contact power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power supply system which unfailingly eliminates foreign objects placed in a space between a power supply coil and a power reception coil from the space.SOLUTION: In a non-contact power supply system 1, a power supply coil 21 and a power reception coil are placed facing each other in a non-contact manner to supply electric power. The non-contact power supply system 1 includes: a cover member 32 which may slide between a closed position where the cover member 32 covers a facing surface 21a of the power supply coil 21 and an open position where the cover member 32 is retreated from the facing surface 21a; and a hook member 40 which causes foreign objects placed on the cover member 32 to move along with slide movement of the cover member 32 from the closed position to the open position.

Description

  The present invention relates to a non-contact power feeding system.

  In recent years, attention has been focused on a non-contact power feeding system that feeds power by making a power feeding coil and a power receiving coil face each other in a non-contact manner. The non-contact power supply system employs a magnetic field resonance method or an electromagnetic induction method, and is expected to be applied to power supply of a moving vehicle such as an electric vehicle. However, in this non-contact power feeding system, if foreign matter exists between the power feeding coil and the power receiving coil, the power feeding efficiency is lowered, and if the foreign matter is a metal such as an empty can, it may generate heat due to the influence of a magnetic field. There is.

  Patent Document 1 below discloses a power feeding device that includes a power transmission unit that performs power transmission using a magnetic field and a foreign matter removal operation unit that removes foreign matter in the vicinity of the power transmission path during power transmission. The foreign matter removing operation unit is configured to remove foreign matter by at least one operation of tilting, rotating, and vibrating the housing unit that houses the power transmission unit.

  Patent Document 2 listed below discloses an electric vehicle including a sweeping unit that sweeps out foreign matter already present on a power feeding coil before the start of charging. The sweeping unit is disposed on the bottom surface of the electric vehicle, and is movable between the housed state and the sweepable state, and moves to the sweepable state when the electric vehicle approaches the power feeding unit. It is configured.

  Patent Document 3 below discloses an electric system including a dome-shaped housing that prevents animals and foreign objects from being placed on a ground equipment transducer. The dome-shaped housing includes an outer surface having a plurality of points arranged at a plurality of heights, at least one of the plurality of points having a first height, and the other points of the plurality of points are Each height is configured to be lower than the first height.

JP 2013-21886 A JP 2013-48511 A JP 2013-59249 A

However, the above prior art has the following problems.
Since the techniques of Patent Documents 1 and 3 are designed to incline the accommodating part that accommodates the power transmission part, it is not possible to increase the inclination in a narrow space between the electric vehicle and the ground, and some foreign objects are excluded. It may be insufficient. In addition, for example, when the foreign matter is a gum with silver paper and has adhesiveness, the foreign matter cannot be excluded by any of inclination, rotation, and vibration.
In the technique of Patent Document 2, a sweeping unit must be mounted on an electric vehicle, and an apparatus needs to be added to the electric vehicle itself.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a non-contact power feeding system capable of reliably removing a placed foreign object from between a power feeding coil and a power receiving coil.

In order to solve the above-described problem, the present invention provides a non-contact power feeding system that feeds power by causing a power feeding coil and a power receiving coil to face each other in a non-contact manner, and includes at least one of the power feeding coil and the power receiving coil. A cover member slidable between a closed position covering the opposite surface and an open position retracted from the opposite surface, and foreign matter placed on the cover member from the closed position of the cover member to the open position And a foreign substance accompanying means for accompanying the slide.
By adopting this configuration, in the present invention, the opposing surface of the power feeding coil or the power receiving coil is covered with the cover member, and the foreign matter placed on the cover member is caused to accompany the slide of the cover member by the foreign matter accompanying means. In the case of contact power feeding, it is excluded from the facing surface. In the present invention, the foreign matter is not removed from the cover member due to an inclination or the like, but the foreign matter is retreated from the facing surface together with the cover member.

In the present invention, the foreign substance accompanying means may include a hook member that is provided on the cover member and projects upward from a mounting surface on which the foreign substance is placed.
By adopting this configuration, in the present invention, the cover member is provided with a hook member, and the foreign matter placed on the placement surface of the cover member is hooked on the hook member, thereby allowing the foreign matter to accompany the slide of the cover member. Can do.

Moreover, in this invention, the structure of having the winding-up means which winds up the said cover member in roll shape is employ | adopted.
By adopting this configuration, in the present invention, it is not necessary to secure a large space at the slide destination of the cover member by winding the cover member in a roll shape, and space saving can be achieved.

Moreover, in this invention, the structure of having the folding means which folds the said cover member in a bellows shape is employ | adopted.
By adopting this configuration, in the present invention, by folding the cover member in a bellows shape, it is not necessary to secure a large space at the slide destination of the cover member, and space saving can be achieved.

Moreover, in this invention, the said foreign material accompanying means employ | adopts the structure that it has an adhesion means to adhere the said foreign material to the said cover member.
By adopting this configuration, in the present invention, the adhering means is provided on the cover member, and the adhering means adheres to the cover member by the adhering means, so that the foreign object can accompany the slide of the cover member.

Moreover, in this invention, the structure of having a blade member which scrapes off the said foreign material adhering to the said cover member in the destination of the said foreign material is employ | adopted.
By adopting this configuration, in the present invention, the foreign matter attached to the cover member by the blade member is scraped off, so that the foreign matter can be prevented from returning to the opposing surface again.

Further, in the present invention, a configuration is adopted in which foreign matter collecting means for collecting the foreign matter is provided at the destination of the foreign matter.
By adopting this configuration, in the present invention, the foreign matter placed on the cover member is collected by the foreign matter collecting means, so that the foreign matter cannot be returned to the opposite surface again.

  ADVANTAGE OF THE INVENTION According to this invention, the non-contact electric power feeding system which can remove | eliminate the mounted foreign material reliably from between a feeding coil and a receiving coil is obtained.

It is a whole block diagram of the non-contact electric power feeding system in 1st Embodiment of this invention. It is a lineblock diagram of a foreign substance exclusion device in a 1st embodiment of the present invention. It is a block diagram of the foreign material exclusion apparatus in 2nd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is an overall configuration diagram of a non-contact power feeding system 1 according to the first embodiment of the present invention.
The non-contact power feeding system 1 performs non-contact power feeding between a power receiving device and a power feeding device in which at least one of them can move. In the present embodiment, as shown in FIG. The stop station 20 where the mobile vehicle 10 stops is a power supply device. The moving vehicle 10 is movable relative to a stop station 20 provided on the road surface 2.

  The moving vehicle 10 is provided with a power receiving coil 11. On the other hand, the stopping station 20 is provided with a feeding coil 21. The power receiving coil 11 has a facing surface 11 a that can face the power feeding coil 21 on the ground side, and is provided at the bottom of the mobile vehicle 10. The power reception coil 11 receives AC power in a non-contact manner by electromagnetically coupling with the power supply coil 21.

  The non-contact power feeding from the power feeding coil 21 to the power receiving coil 11 in the non-contact power feeding system 1 of the present embodiment is performed based on the magnetic field resonance method. That is, a resonance capacitor (not shown) for constituting a resonance circuit is connected to each of the feeding coil 21 and the receiving coil 11. Further, for example, the capacitance of the resonance capacitor is the same as the resonance frequency of the power supply side resonance circuit composed of the power supply coil 21 and the resonance capacitor and the resonance frequency of the power reception side resonance circuit composed of the power reception coil 11 and the resonance capacitor. The frequency is set.

In addition to the power receiving coil 11, the moving vehicle 10 is provided with a power receiving circuit 12 and a storage battery 13.
The power receiving circuit 12 is a power conversion circuit that converts the received power received from the power supply coil 21 into DC power and supplies the DC power to the storage battery 13. In other words, the power receiving circuit 12 charges the storage battery 13 by supplying a charging current corresponding to the charging state of the storage battery 13 to the storage battery 13.
The storage battery 13 is a secondary battery capable of storing sufficient power as a driving power source for the mobile vehicle 10, and is, for example, a lithium ion secondary battery or a nickel hydrogen secondary battery.

On the other hand, the power feeding coil 21 has a facing surface 21 a that can face the power receiving coil 11, and is provided on the road surface 2. In addition to the power supply coil 21, the stop station 20 is provided with a power supply circuit 22 and an external power source 23.
The power supply circuit 22 is a power conversion circuit that converts the power supplied from the external power supply 23 into AC power corresponding to the resonance frequency of the magnetic resonance type non-contact power supply and supplies the AC power to the power supply coil 21.
The external power source 23 is, for example, a commercial power source, a solar battery, wind power generation, or the like, and supplies the power to the power feeding circuit 22.

The non-contact power feeding system 1 includes a foreign matter removing device 30 that removes foreign matters placed between the power feeding coil 21 and the power receiving coil 11 during non-contact power feeding.
The foreign substance exclusion device 30 according to the present embodiment includes a housing 31 that surrounds the power supply coil 21 and a cover member 32 that covers the power supply coil 21 by covering the housing 31.

FIG. 2 is a configuration diagram of the foreign matter exclusion apparatus 30 according to the first embodiment of the present invention. In addition, the code | symbol X has shown an example of the metal foreign material.
The housing 31 has a wall portion 33 having a substantially rectangular shape in plan view, and the inside of the wall portion 33 is partitioned into two spaces S1 and S2 by a partition portion 34. The space S <b> 1 is covered with a cover member 32, and the space S <b> 2 is covered with a roof portion 35.

  A power feeding coil 21 is accommodated in the space S1. The casing 31 functions as an electromagnetic shield for EMC (Electro Magnetic Compatibility) of the feeding coil 21. In addition, the housing 31 has a wall 33 standing up from the road surface 2 at a height equal to or higher than the power supply coil 21, and functions as a physical shield that prevents foreign matter from entering the inside from the side surface. Yes. In addition, although the partition part 34 is lower than the wall part 33, it is formed with the same material as the wall part 33, and does not exert electromagnetic influence on space S2. Moreover, it is preferable to form the roof part 35 with the same material as the wall part 33.

  The cover member 32 has a closed position (shown by a solid line in FIG. 2) that covers the facing surface 21a of the power feeding coil 21, and an open position (shown by a two-dot chain line in FIG. 2) that retreats from the facing surface 21a of the feeding coil 21. Moreover, it is comprised so that a slide is possible between FIG. In the present embodiment, a slide guide 36 is provided on the inner surface of the wall portion 33, and the cover member 32 is configured to be slidable in the horizontal direction along the slide guide 36.

  The cover member 32 is formed so that it can be wound into a roll by a winder 37 (winding means) provided in the space S2. The cover member 32 of this embodiment is formed in a sheet shape having a predetermined rigidity, and slides between a closed position and an open position by winding / rewinding of the winder 37. When rewinding, the cover member 32 may be pulled by a string (not shown). The surface 32a (mounting surface) of the cover member 32 is preferably subjected to surface processing (for example, polytetrafluoroethylene processing) that is difficult for foreign matter to adhere.

  The cover member 32 is provided with a hook member 40 (foreign substance accompanying means). The hook member 40 is integrally attached to the rear end portion of the cover member 32 wound up in a roll shape. Both end portions of the hook member 40 are supported by a slide guide 36 and configured to be slidable in the horizontal direction together with the cover member 32. The slide guide 36 is provided at substantially the same height as the top of the partition portion 34, and the hook member 40 can slide without colliding with the partition portion 34.

  The hook member 40 causes the foreign matter placed on the cover member 32 to accompany the slide of the cover member 32 from the closed position to the open position. The hook member 40 protrudes above the surface 32a of the cover member 32 on which a foreign object is placed. The hook member 40 of the present embodiment is an L-shaped hook, and an upper end portion of the hook member 40 protrudes upward to a position where it can be locked with the roof portion 35. The hook member 40 functions as a stopper for winding the cover member 32 by being locked to the roof portion 35. In addition, since the cover member 32 and the hook member 40 are arrange | positioned near the electric power feeding coil 21 in the winding state, it is preferable to form from a nonmagnetic and nonelectroconductive material.

  A blade member 41 is provided in the space S2. The blade member 41 is for scraping off foreign matter adhering to the cover member 32. In addition to non-adhesive materials (such as empty cans), foreign materials include those that have adhesive properties (such as gum with silver paper). Moreover, what does not have adhesiveness may be put on what has adhesiveness. The blade member 41 physically removes such foreign matter.

  The tip of the blade member 41 is disposed in contact with or close to the surface 32a of the cover member 32 wound up in a roll shape by the winder 37. As shown in FIG. 2, when the tip of the blade member 41 is brought into contact with the surface 32 a of the cover member 32, the blade member 41 can be deformed following the cover member 32 whose diameter increases according to the number of rotations. Is preferably made of an elastically deformable material. The blade member 41 is erected from the road surface 2 so that the scraped foreign matter does not enter the winder 37 side.

  In the space S2, a foreign matter collecting part 42 (foreign matter collecting means) is provided. The foreign matter collection unit 42 has a size that can accommodate foreign matter assumed to be placed on the cover member 32. The foreign material collection part 42 of this embodiment is formed by the wall part 33 and the blade member 41, and the upper part is covered with the roof part 35 so that the collected foreign material is not blown off by wind or the like. In addition, the roof part 35 is provided so that opening and closing is possible with respect to the wall part 33 with the hinge mechanism not shown, and it has the structure which can take out the foreign material collect | recovered by opening the roof part 35. FIG.

Next, the power feeding operation of the non-contact power feeding system 1 configured as described above and the foreign matter removing operation of the foreign matter removing apparatus 30 will be described.
As shown in FIG. 1, the non-contact power feeding system 1 performs non-contact power feeding between the moving vehicle 10 and the stop station 20. As for power feeding, the magnetic field resonance method is adopted for power transmission between the power feeding coil 21 and the power receiving coil 11, and it is highly resistant to displacement of the resonance coils provided in both the moving vehicle 10 and the stop station 20, and has high efficiency. In addition, long-distance power transmission can be realized.

  In non-contact power feeding, if a foreign object exists between the power feeding coil 21 and the power receiving coil 11, the formation of a magnetic field is hindered to reduce power feeding efficiency. If the foreign material is a metal such as an empty can, it is affected by the magnetic field. There is a risk of heat generation. For this reason, the non-contact power feeding system 1 includes a foreign matter removing device 30 that removes foreign matters placed between the power feeding coil 21 and the power receiving coil 11 during non-contact power feeding. When the power supply coil 21 is installed on the ground side as in the present embodiment, foreign matter may be placed on the facing surface 21 a of the power supply coil 21.

  As shown in FIG. 2, the foreign substance exclusion device 30 includes a cover member 32 that covers the opposing surface 21 a of the power feeding coil 21. The cover member 32 is located at a closed position on the facing surface 21a of the power feeding coil 21 when non-contact power feeding is not performed, and prevents foreign matter from being directly placed on the facing surface 21a. Intrusion of foreign matter from the side of the feeding coil 21 due to wind or the like is prevented by the casing 31 that also functions as an electromagnetic shield.

  When performing non-contact power feeding, the cover member 32 is wound by the winder 37 and slides to an open position where it is retracted from the facing surface 21 a of the power feeding coil 21. At this time, foreign matters (for example, empty cans) placed on the surface 32 a of the cover member 32 try to roll off from the rear end portion of the cover member 32 due to inertial force. Is provided. The hook member 40 protrudes upward from the surface 32a on which the foreign matter is placed, and the foreign matter can be caused to accompany the slide of the cover member 32 by hooking the foreign matter placed on the surface 32a.

  The cover member 32 is wound up until the hook member 40 is engaged with the roof portion 35, and retracts from the facing surface 21a of the power feeding coil 21. At the same time, the foreign matter placed on the cover member 32 accompanies the slide of the cover member 32 and is removed from the facing surface 21 a of the power supply coil 21. As described above, the foreign matter removing device 30 is configured to retract the foreign matter together with the cover member 32 from the facing surface 21a without dropping the foreign matter from the cover member 32 due to an inclination or the like. It is possible to surely eliminate from between the coil 21 and the power receiving coil 11, and it is possible to eliminate the uncertainty of foreign object exclusion.

Further, since the cover member 32 slides in a direction intersecting with the opposing direction of the power feeding coil 21 and the power receiving coil 11, a space in the height direction is not required, and the foreign object exclusion device 30 is moved between the moving vehicle 10 and the road surface 2. Can fit in a narrow space between.
Furthermore, in this embodiment, it has the winder 37 which winds up the cover member 32 in roll shape. According to this configuration, since the winder 37 winds the cover member 32 in a roll shape, it is not necessary to secure a large space at the slide destination of the cover member 32 (on the right side in FIG. 2). Space saving in the planar area can also be achieved.

  The foreign matter falls off from the cover member 32 wound up in a roll shape at the destination, and is collected by the foreign matter collection unit 42. Thereby, even if the cover member 32 is rewound, it is possible to prevent the foreign matter from returning to the opposing surface 21a again. Further, in the present embodiment, even if foreign matter adheres to the cover member 32, it can be scraped off by the blade member 41, and the foreign matter can be collected in the foreign matter collection unit 42. In addition, since the foreign material collection | recovery part 42 is separated from the electric power feeding coil 21, and since it does not receive the influence of a magnetic field by electromagnetic shields, such as the partition part 34, it does not generate | occur | produce even if the collect | recovered foreign material is a metal, Even if heat is generated, the feeding coil 21 is not damaged by heat.

  Thus, according to the above-described embodiment, the non-contact power feeding system 1 performs power feeding by causing the power feeding coil 21 and the power receiving coil 11 to face each other in a non-contact manner, and covers the surface 21 a of the power feeding coil 21. The cover member 32 slidable between the closed position and the open position retracted from the facing surface 21a, and the foreign matter placed on the cover member 32 accompany the slide of the cover member 32 from the closed position to the open position. By adopting the configuration of having the hook member 40 to be provided, the non-contact power feeding system 1 that can reliably remove the placed foreign matter from between the power feeding coil 21 and the power receiving coil 11 is obtained.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.
FIG. 3 is a configuration diagram of the foreign matter exclusion apparatus 30 according to the second embodiment of the present invention.
In 2nd Embodiment, as shown in FIG. 3, the structure of the cover member 32 differs from the said embodiment.

  The cover member 32 of the second embodiment includes a closed position (shown by a solid line in FIG. 3) that covers the opposing surface 21a of the power feeding coil 21, and an open position (two in FIG. 3) that retracts from the opposing surface 21a of the power feeding coil 21. (Shown by a dotted line). In the present embodiment, a slide guide 36 is provided on the inner surface of the wall portion 33, and the cover member 32 is configured to be slidable in the horizontal direction along the slide guide 36.

  The cover member 32 is formed to be foldable in a bellows shape by a string winder 50 (folding means) provided in the space S2. The cover member 32 of the present embodiment is formed by folding a spring-like sheet material into a bellows shape, and a guide piece 51 supported by the slide guide 36 is attached to the tip portion. A string 52 is connected to the guide piece 51, and when the string winder 50 winds the string 52, the cover member 32 slides to the open position, and the cover member 32 is covered by the spring restoring force of the cover member 32. The member 32 is slid to the closed position.

  The cover member 32 has a peak portion 53 (foreign material accompanying means) that is partially folded. The crest 53 is disposed adjacent to the guide piece 51 and is formed to be higher than the other crests of the cover member 32. The crest portion 53 causes the foreign matter placed on the cover member 32 to accompany the slide of the cover member 32 from the closed position to the open position. The mountain portion 53 protrudes upward to a position where it can be locked with the roof portion 35 when folded. The hook member 40 functions as a stopper for folding the cover member 32 by being locked to the roof portion 35.

  According to the second embodiment of the above configuration, the opposing surface 21a of the power supply coil 21 is covered with the cover member 32, and the foreign matter placed on the cover member 32 is caused to accompany the slide of the cover member 32 by the mountain portion 53. In the case of non-contact power feeding, it can be excluded from the facing surface 21a. As described above, in the second embodiment, similarly to the above-described embodiment, the foreign matter is retracted together with the cover member 32 from the facing surface 21a, and thus the uncertainty of foreign matter removal can be eliminated.

  Further, in the second embodiment, by folding the cover member 32 in a bellows shape, it is not necessary to secure a large space at the slide destination of the cover member 32, and space saving can be achieved. Further, by forming one of the bellows to form the peak portion 53, the foreign substance accompanying means can be integrated with the cover member 32, and the number of parts can be reduced and the assemblability can be improved. In the second embodiment, when the cover member 32 is closed, the foreign matter also returns to the original position. However, no problem arises if there is no foreign matter between the power feeding coil 21 and the power receiving coil 11 during non-contact power feeding. .

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above-described embodiment, the hook member 40 and the mountain portion 53 are exemplified as the foreign object accompanying means, but the present invention is not limited to this configuration. For example, an attaching means for attaching the foreign matter to the cover member 32 may be adopted as the foreign matter accompanying means. According to this configuration, there is no need to provide a structure that raises the height, such as the hook member 40 or the mountain portion 53, which can contribute to space saving. The adhering means may be, for example, an adhesive sheet attached to the surface 32a of the cover member 32 shown in FIG. 1, or may be a magnet sheet or the like that is attracted by magnetic force if the foreign matter is a magnetic substance.

  For example, in the above-described embodiment, power is supplied from the stop station 20 on the ground side and power is supplied to the bottom of the moving vehicle 10, but the direction of power supply is not limited. For example, power may be supplied from the wall to the side, front, or rear of the moving vehicle 10, or the roof may be supplied from the ceiling to the moving vehicle 10.

  For example, in the said embodiment, although the receiving coil 11 was provided in the moving vehicle 10, and the case where the feed coil 21 was provided in the stop station 20 was illustrated, it is not limited to this structure, For example, the receiving coil 11 is provided. The power supply coil 21 may be provided in the moving vehicle 10 provided in the stop station 20. Therefore, the foreign substance exclusion device 30 may be provided on the power receiving coil 11 side, or may be provided on both sides of the power feeding coil 21 and the power receiving coil 11. In addition, the present invention can be applied even if at least one of the power receiving device and the power feeding device is a moving vehicle, or a moving body such as a ship, a submarine, or an aircraft.

  For example, the present invention is particularly effective when combined with a magnetic resonance type non-contact power supply that can tolerate a large misalignment, but may be combined with other types of non-contact power supply such as an electromagnetic induction type.

  Further, for example, substitution and combination of the configurations of the above-described embodiments are possible as appropriate.

  DESCRIPTION OF SYMBOLS 1 ... Non-contact electric power feeding system, 11 ... Power receiving coil, 21 ... Power feeding coil, 21a ... Opposite surface, 30 ... Foreign substance exclusion device, 32 ... Cover member, 32a ... Surface (mounting surface), 37 ... Winding machine (winding) Means), 40 ... hook member (foreign matter accompanying means), 41 ... blade member, 42 ... foreign matter collecting part (foreign matter collecting means), 50 ... string winder (folding means), 53 ... mountain part (foreign matter accompanying means), X ... Foreign matter

Claims (7)

A non-contact power feeding system that feeds power by facing a feeding coil and a receiving coil in a non-contact manner,
A cover member that is slidable between a closed position that covers the opposing surface of at least one of the power supply coil and the power receiving coil, and an open position that retracts from the opposing surface;
A non-contact power feeding system, comprising: a foreign object accompanying means for causing the foreign object placed on the cover member to accompany the slide of the cover member from the closed position to the open position.   The non-contact power feeding system according to claim 1, wherein the foreign substance accompanying means includes a hook member provided on the cover member and protruding upward from a mounting surface on which the foreign substance is placed.   The contactless power supply system according to claim 1, further comprising a winding unit that winds the cover member in a roll shape.   The contactless power feeding system according to claim 1, further comprising a folding unit that folds the cover member in a bellows shape.   The contactless power feeding system according to any one of claims 1 to 4, wherein the foreign matter accompanying means includes attachment means for attaching the foreign matter to the cover member.   6. The non-contact power feeding system according to claim 1, further comprising a blade member that scrapes off the foreign matter adhering to the cover member at the destination of the foreign matter.   The non-contact power feeding system according to claim 1, further comprising a foreign material collecting unit that collects the foreign material at the destination of the foreign material.

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