JP5786822B2 - Evaporative fuel processing equipment - Google Patents

Description

  The present invention relates to a fuel vapor processing apparatus.

  Conventionally, an internal combustion engine for driving a vehicle (hereinafter also referred to as an “engine”) that is driven by a highly volatile fuel is supplied with an evaporative fuel generated in a fuel tank, etc. An evaporative fuel processing device that performs a purging operation that is adsorbed by a “canister” and desorbs fuel from the canister during operation of the engine and sucks it into the intake passage of the engine is provided.

  As the adsorbent used in the canister, activated carbon is mainly used. Activated charcoal improves the ability to adsorb fuel as the temperature decreases, and the ability to desorb the adsorbed fuel increases as the temperature increases. That is, the canister preferably has a high internal temperature when desorbing the fuel, and preferably has a low internal temperature when adsorbing the fuel.

  As a conventional evaporative fuel processing apparatus, one having a canister provided in a fuel tank and an oil supply pipe for supplying fuel to the fuel tank is known (for example, see Patent Document 1). The open end (open end located inside the fuel tank) of the fuel supply pipe on the downstream side in the fuel flow direction is configured to face the side surface of the canister.

  In this fuel vapor processing apparatus, when fuel is supplied, the fuel supplied from the fuel supply pipe to the fuel tank hits the canister, the fuel cools the canister, and the internal temperature of the canister decreases. Thereby, the adsorption | suction performance of the evaporative fuel by a canister comes to improve.

  Further, when the fuel is not supplied, for example, when the engine is operated, the canister is immersed in the fuel stored in the fuel tank, and the canister is kept warm by the fuel, so that a decrease in the internal temperature of the canister can be suppressed. . Thereby, the desorption performance of the evaporated fuel from the canister is ensured.

JP-A-8-42405

  However, in the conventional evaporative fuel processing apparatus as described in Patent Document 1, when the fuel liquid level in the fuel tank becomes high, the entire canister sinks into the fuel. When fuel is supplied while the entire canister is submerged in the fuel, the fuel supplied from the fuel supply pipe to the fuel tank is mixed with the fuel existing in the fuel tank and then hits the canister. For this reason, it becomes difficult for the canister to be cooled, and it becomes difficult to sufficiently exhibit the adsorption performance of the evaporated fuel.

  Further, in the conventional evaporative fuel processing apparatus described in Patent Document 1, when the fuel level in the fuel tank is lowered, the upper part of the canister is not immersed in the fuel and the atmosphere in the fuel tank (vaporized fuel) It will be exposed to the atmosphere containing When the upper part of the canister is exposed to the atmosphere in the fuel tank, the upper part of the canister is not immersed in the fuel. For this reason, the heat insulation of the upper part of a canister becomes inadequate, and it becomes difficult to ensure the desorption performance of the evaporative fuel at the time of purge operation.

  Thus, in the conventional evaporative fuel processing apparatus as described in Patent Document 1, the canister adsorption performance and desorption performance cannot be sufficiently exhibited according to the fuel liquid level position in the fuel tank. There was a problem.

  Therefore, the present invention provides an evaporative fuel processing apparatus capable of sufficiently exhibiting the adsorption performance and desorption performance of a canister according to the fuel liquid level position in the fuel tank, as compared with the conventional one. Objective.

  In order to solve the above problems, an evaporative fuel processing apparatus according to the present invention is (1) a lower canister and an upper canister that are disposed in a fuel tank and adsorb evaporative fuel generated in the fuel tank, and the fuel An evaporative fuel processing apparatus comprising a fuel supply pipe for supplying fuel from outside the tank into the fuel tank, wherein the lower side caster is fixed to the fuel tank, and the upper side canister According to the fuel liquid level position in a tank, it is comprised so that it may approach / separate from the said lower side canister.

  With this configuration, when the fuel level in the fuel tank starts to rise, the evaporative fuel processing device of the present invention is in a state where the upper canister is immersed in the fuel in the fuel tank as the fuel level rises. Will rise. That is, the upper canister does not immediately sink into the fuel even when the fuel level starts to rise.

  Therefore, when the fuel level in the fuel tank is high, the fuel supplied from the fuel supply pipe to the fuel tank hits the upper canister immersed in the fuel in the fuel tank, and cools the upper canister. As a result, the evaporative fuel treatment apparatus of the present invention can sufficiently exhibit the evaporative fuel adsorption performance as compared with the conventional one.

  In addition, when the fuel level in the fuel tank starts to drop, the evaporative fuel processing apparatus of the present invention moves down in a state where the upper canister is immersed in the fuel in the fuel tank as the fuel level drops. Will do. In other words, the upper canister is not immediately exposed to the atmosphere in the fuel tank even if the fuel level starts to drop.

  Therefore, when the fuel liquid level in the fuel tank is low, the lower side canister and the upper side canister are immersed in the fuel in the fuel tank and are kept warm by the fuel in the fuel tank. As a result, the evaporative fuel treatment apparatus of the present invention can sufficiently exhibit the evaporative fuel desorption performance as compared with the conventional one.

  In the fuel vapor processing apparatus described in (1) above, (2) the upper canister may be configured to float in the fuel by buoyancy received from the fuel in the fuel tank.

  With this configuration, the evaporative fuel processing apparatus according to the present invention allows the upper side canister to move closer to and away from the lower side canister according to the fuel level in the fuel tank. The upper canister can be moved up and down.

  Further, in the fuel vapor processing apparatus according to (1) or (2), (3) an opening end on the downstream side in the fuel flow direction of the fuel supply pipe may face the upper surface of the upper canister. .

  With this configuration, the fuel vapor processing apparatus of the present invention can effectively cool the upper side canister because the fuel supplied from the fuel supply pipe into the fuel tank hits the upper surface of the upper side canister.

  In the fuel vapor processing apparatus according to any one of the above (1) to (3), (4) a stopper that restricts the movement range of the upper side canister may be provided.

  With this configuration, the evaporative fuel treatment apparatus of the present invention has a stopper that prevents the upper side canister from rising when fuel is supplied, so that the upper side canister can be surely immersed in the fuel in the fuel tank and the evaporative fuel can be adsorbed. It can be fully demonstrated.

  In the fuel vapor processing apparatus according to any one of (1) to (4), (5) a guide member that guides the upper side canister in the vertical direction may be provided.

  With this configuration, the evaporative fuel processing apparatus of the present invention sufficiently exhibits the evaporative fuel adsorption performance because the guide member guides the upper canister in the vertical direction as the fuel level in the fuel tank rises and lowers. In addition, the desorption performance of the evaporated fuel during the purge operation can be sufficiently exhibited.

  In the fuel vapor processing apparatus according to any one of (1) to (5), (6) the lower side canister and the upper side canister are configured to communicate with each other via an expansion pipe. Also good.

  With this configuration, the evaporative fuel processing apparatus of the present invention can use the lower side canister and the upper side canister as one canister.

  In the fuel vapor processing apparatus described in (6) above, (7) an atmospheric port may be formed in the lower canister, and a tank port and a purge port may be formed in the upper canister.

  With this configuration, the fuel vapor processing apparatus of the present invention can adsorb the fuel vapor generated in the fuel tank to the upper side canister and the lower side canister via the tank port, and the upper side canister and the lower side canister. The evaporated fuel desorbed from the canister can be sent out of the fuel tank via the purge port.

  In the fuel vapor processing apparatus described in (6) above, (8) a tank port and a purge port may be formed in the lower canister, and an air port may be formed in the upper canister.

  With this configuration, the fuel vapor processing apparatus of the present invention can adsorb the fuel vapor generated in the fuel tank to the lower side canister and the upper side canister via the tank port, and the lower side canister and the upper side canister. The evaporated fuel desorbed from the fuel can be sent out of the fuel tank through the purge port.

  According to the present invention, it is possible to provide an evaporative fuel processing apparatus capable of sufficiently exerting the adsorption performance and desorption performance of a canister according to the fuel liquid level position in the fuel tank as compared with the conventional one. it can.

It is a schematic block diagram which shows the state with the low fuel liquid level position in a fuel tank in the evaporative fuel processing apparatus which concerns on embodiment of this invention. It is a schematic block diagram which shows the state with the high fuel liquid level position in a fuel tank in the evaporative fuel processing apparatus which concerns on embodiment of this invention. FIG. 2 is an enlarged view of a lower side canister and an upper side canister in FIG. 1. FIG. 3 is an enlarged view of a lower canister and an upper canister in FIG. 2. FIG. 3 is a perspective view of a lower side canister and an upper side canister in FIG. 2. FIG. 6 is a side view of the lower side canister and the upper side canister in FIG. 5.

  Embodiments of an evaporated fuel processing apparatus according to the present invention will be described below with reference to the drawings.

  The evaporative fuel processing apparatus according to the present embodiment is installed in an internal combustion engine for driving a vehicle that is operated with a highly volatile fuel (for example, gasoline).

  As shown in FIGS. 1 and 2, the evaporative fuel processing apparatus according to the present embodiment includes a lower canister 2 and an upper canister 3 that adsorb evaporative fuel generated in the fuel tank 1, and the fuel tank 1 from the outside. And an oil supply pipe 4 for supplying the fuel F to the tank.

The lower canister 2 and the upper canister 3 are disposed in the fuel tank 1. The upper canister 3 is positioned above the lower canister 2 and is configured to move up and down in accordance with the fuel liquid level position in the fuel tank 1.
ing.

  The lower canister 2 has a hollow lower case 20 and an adsorbent A filled in the lower case 20. For the adsorbent A, for example, activated carbon is used.

  As shown in FIGS. 3 and 4, the lower case 20 includes a rectangular bottom plate 21, a frame-shaped wall plate 22, a frame-shaped flange 23, and a rectangular lid plate 24. ing. As the material of the lower case 20, a resin, a steel plate, or the like is used.

  The wall plate 22 protrudes upward from the peripheral portion of the bottom plate 21 and surrounds the bottom plate 21 in the circumferential direction. The flange 23 protrudes horizontally from the upper edge portion of the wall plate 22 so as to surround the wall plate 22 in the circumferential direction. The bottom plate 21, the wall plate 22, and the flange 23 are integrally formed. The cover plate 24 is in contact with the upper surface of the flange 23 so as to cover the entire surface of the bottom plate 21 from above.

  A space surrounded by the bottom plate 21, the wall plate 22, the flange 23, and the lid plate 24 is filled with the adsorbent A. The upper surface of the flange 23 and the peripheral edge portion on the lower surface of the cover plate 24 are sealed so that the fuel F does not enter from the outside to the inside of the lower case 20. The bottom plate 21 is fixed to the inner bottom surface of the fuel tank 1.

  As shown in FIGS. 5 and 6, a cylindrical atmospheric port forming member 26 is provided at the front end of the lower case 20. The atmospheric port forming member 26 passes through the wall plate 22 of the lower case 20.

  The atmospheric port forming member 26 is connected to the downstream end of the atmospheric introduction pipe (not shown) in the atmospheric flow direction. The air introduction pipe passes through the fuel tank 1. Furthermore, the end of the air introduction pipe on the upstream side in the air circulation direction opens into the air.

  The upper canister 3 includes a hollow upper case 30 and an adsorbent A filled in the upper case 30. For the adsorbent A, for example, activated carbon is used.

  As shown in FIGS. 3 and 4, the upper case 30 includes a rectangular top plate 31, a frame-shaped wall plate 32, a frame-shaped flange 33, and a rectangular lid plate 34. Has been. As the material of the upper case 30, resin, steel plate, or the like is used.

  The wall plate 32 protrudes downward from the peripheral portion of the top plate 31 and surrounds the top plate 31 in the circumferential direction. The flange 33 protrudes horizontally from the upper edge portion of the wall plate 32 so as to surround the wall plate 32 in the circumferential direction. The top plate 31, the wall plate 32, and the flange 33 are integrally formed. The cover plate 34 is in contact with the upper surface of the flange 33 and covers the top plate 31 from the upper side to the entire surface.

  The planar shape of the flange 33 and the cover plate 34 constituting the upper side case 30 is formed larger than the planar shape of the flange 23 and the cover plate 34 constituting the lower side case 20.

  A space surrounded by the top plate 31, the wall plate 32, the flange 33, and the lid plate 34 is filled with the adsorbent A. The lower surface of the flange 33 and the peripheral edge portion of the upper surface of the lid plate 34 are sealed so that the fuel F does not enter from the outside to the inside of the upper case 30.

  3 and 4, stoppers 35 are provided on the left and right side portions of the cover plate 34 for restricting the ascending range of the upper canister 3 relative to the lower canister 2. The stopper 35 includes a strip-shaped leg portion 35a and a protruding claw portion 35b.

  The leg portion 35 a is formed integrally with the lid plate 34. The leg portion 35 a extends downward from the lid plate 34. As shown in FIG. 3, the leg 35 a faces the wall plate 22 of the lower case 20 when the upper case 30 is lowered.

  The claw portion 35b is formed integrally with the lower end portion of the leg portion 35a. The claw portion 35 b protrudes toward the wall plate 22 of the lower case 20. As shown in FIG. 4, the claw portion 35 b comes into contact with the lower surface of the flange 23 of the lower case 20 when the upper case 30 is raised.

  The stopper 35 is guided in the vertical direction by the guide member 25 shown in FIGS. The guide member 25 is formed integrally with the wall plate 22 of the lower case 20 so as to be positioned before and after each stopper 35.

  The guide member 25 plays a role of restricting movement of the claw portion 35b of the stopper 35 in the front-rear direction, that is, movement of the upper case 30 in the front-rear direction. The stopper 35 plays a role of restricting the movement of the upper case 30 in the left-right direction.

  As shown in FIGS. 5 and 6, a cylindrical tank port forming member 36 and a cylindrical purge port forming member 37 are provided at the front end portion of the upper case 30. The tank port forming member 36 and the purge port forming member 37 respectively penetrate the wall plate 32 of the upper side case 30.

  The tank port forming member 36 is connected to an end of the evaporation pipe (not shown) on the downstream side in the fuel vapor flow direction. The upstream end of the evaporation pipe in the direction of the evaporative fuel flow communicates with the atmosphere in the fuel tank 1 (atmosphere containing vaporized fuel), that is, with the upper space in the fuel tank 1.

  The purge port forming member 37 is connected to an end portion of the purge pipe (not shown) on the upstream side in the fuel vapor flow direction. This purge pipe passes through the fuel tank 1. Further, the lower end portion of the purge pipe in the direction of fuel vapor flow is connected to a negative pressure generating mechanism (not shown). The negative pressure generating mechanism is configured to generate a negative pressure when the engine is operated.

  As shown in FIGS. 5 and 6, a cylindrical lower side communication port forming member 27 and a cylindrical upper side communication port are formed at the rear end portion of the lower case 20 and the rear end portion of the upper case 30. A member 38 is provided. The lower communication port forming member 27 passes through the wall plate 22 of the lower case 20. The upper communication port forming member 38 passes through the wall plate 32 of the upper case 30.

  One end of the telescopic pipe 40 is connected to the lower communication port forming member 27. The other end of the expansion / contraction pipe 40 is connected to the upper communication port forming member 38. Thereby, the inside of the lower side case 20 and the inside of the upper side case 30 communicate with each other via the telescopic pipe 40. For example, a bellows is used for the expandable pipe 40.

The density (mass per unit volume) of the upper side canister 3 constituted by the upper side case 30, the adsorbent A, the stopper 35, the tank port forming member 36, the purge port forming member 37 port, and the upper side communication port forming member 38 is The density of the fuel F or the density of the upper canister 3 is made slightly smaller than the density of the fuel F. For example, the density of gasoline is generally 0.783 g / cm ³ .

  Accordingly, when the fuel level in the fuel tank 1 becomes higher than the lower limit position shown in FIG. 1 due to refueling of the fuel F, the upper canister 3 is in the fuel F due to the buoyancy received from the fuel F in the fuel tank 1. To levitating. Further, when the fuel liquid surface position in the fuel tank 1 reaches the upper limit position shown in FIG. 2, the claw portion 35 b of the stopper 35 comes into contact with the lower surface of the flange 23 of the lower case 20. At this time, the top plate 31 of the upper case 30 is immersed in the fuel F.

  Further, when the fuel level of the fuel in the fuel tank 1 becomes lower than the upper limit position shown in FIG. 2 and becomes equal to the lower limit position shown in FIG. The lower surface of the cover plate 34 comes into contact with the upper surface of the cover plate 24 of the lower case 20. At this time, the top plate 31 of the upper case 30 is immersed in the fuel F.

  In order for the density of the upper side canister 3 to satisfy the above-mentioned conditions, it is necessary to adjust the thickness of the member in the upper side case 30 or attach a weight (weight) to the upper side case 30. It is done.

  The fuel tank 1, the lower case 20, the upper case 30, and the stopper 35 are preferably configured as follows if possible in design.

  That is, when the fuel level in the fuel tank 1 is the lower limit position shown in FIG. 1, the amount of fuel F stored in the fuel tank 1 indicates that the fuel remaining amount warning lamp of the vehicle is lit. It may be configured to be equal to the amount of the fuel F.

  If such a configuration is adopted, the vehicle user or the like inevitably supplies the fuel F when the fuel level warning lamp is lit, so that the upper canister 3 is exposed to the atmosphere in the fuel tank 1. Can be avoided.

  Further, when the fuel level in the fuel tank 1 is the upper limit position shown in FIG. 2, the amount of fuel F stored in the fuel tank 1 is the fuel when the fuel gauge of the vehicle indicates Full. It may be configured to be equal to the amount of F.

  By adopting such a configuration, it is possible to avoid the upper canister 3 from sinking into the fuel F in the fuel tank 1 due to the refueling of the fuel F.

  As shown in FIGS. 1 and 2, the fuel supply pipe 4 obliquely penetrates the upper corner of the fuel tank 1. The opening end of the fuel supply pipe 4 on the downstream side in the fuel flow direction is configured to face the upper surface of the top plate 31 of the upper case 30.

  Next, the operation will be described.

  The interior of the lower case 20 which is a component of the lower canister 2 and the interior of the upper case 30 which is a component of the upper canister 3 are connected to the lower communication port forming member 27, the expansion pipe 40 and the upper communication. The port forming member 38 communicates. Thereby, the lower side canister 2 and the upper side canister 3 can be used as one canister.

  The evaporated fuel generated in the fuel tank 1 flows into the upper case 30 through the evaporation pipe and the tank port forming member 36, and is adsorbed by the adsorbent A inside the upper side case 30. Further, the evaporated fuel generated in the fuel tank 1 flows from the upper side case 30 into the lower case 20 through the upper side communication port forming member 38, the telescopic pipe 40 and the lower side communication port forming member 27, It is adsorbed by the adsorbent A inside the lower case 20.

  The evaporated fuel desorbed from the adsorbent A inside the lower case 20 is sent to the negative pressure generating mechanism through the expansion / contraction pipe 40, the upper case 30, the purge port forming member 37, and the purge pipe. Further, the evaporated fuel desorbed from the adsorbent A inside the upper case 30 is sent to the negative pressure generating mechanism through the purge port forming member 37 and the purge pipe.

  When the fuel liquid surface position in the fuel tank 1 is the lower limit position shown in FIG. 1, the lower surface of the cover plate 34 of the upper case 30 is in contact with the upper surface of the cover plate 24 of the lower case 20. Further, the top plate 31 of the upper case 30 is immersed in the fuel F.

  That is, the lower canister 2 and the upper canister 3 are both immersed in the fuel F in the fuel tank 1, and the lower canister 2 and the upper canister 3 are kept warm by the fuel F in the fuel tank 1, so that the purge operation is performed. It is possible to sufficiently exhibit the desorption performance of the evaporated fuel at the time.

  When the fuel level in the fuel tank 1 is the lower limit position shown in FIG. 1, the fuel F supplied from the fuel supply pipe 4 to the fuel tank 1 is immersed in the fuel F in the fuel tank 1. It flows toward the top plate 31 of the case 30.

  Since the top plate 31 is not submerged in the fuel F, the fuel F supplied from the fuel supply pipe 4 to the fuel tank 1 hardly mixes with the fuel F existing in the fuel tank 1, and the upper case Since the upper canister 3 hits the top plate 31 canister 30 and is effectively cooled, the evaporative fuel adsorption performance can be sufficiently exhibited.

  When the fuel level in the fuel tank 1 becomes higher than the lower limit position shown in FIG. 1 due to refueling of the fuel F, the upper canister 3 floats in the fuel F by the buoyancy received from the fuel F in the fuel tank 1. To do. Further, the top plate 31 of the upper case 30 is immersed in the fuel F.

  At this time, the upper case 30 is restricted from moving in the front-rear direction by the guide member 25, and is restricted from moving in the left-right direction by the stopper 35.

  When the lower surface of the cover plate 34 of the upper case 30 and the upper surface of the cover plate 24 of the lower case 20 are separated from each other as the fuel level in the fuel tank 1 rises, the lower surface of the cover plate 34 of the upper case 30 is separated. Since both the upper surface of the cover plate 24 of the lower case 20 and the upper surface of the cover plate 24 become heat transfer surfaces immersed in the fuel F in the fuel tank 1, the heat retention of the lower canister 2 and the upper canister 3 is improved. Desorption performance of the evaporated fuel can be sufficiently exhibited.

  When the fuel level in the fuel tank 1 reaches the upper limit position shown in FIG. 2, the claw portion 35 b of the stopper 35 comes into contact with the lower surface of the flange 23 of the lower case 20, and the upward movement of the upper canister 3 is restricted. The At this time, the top plate 31 of the upper case 30 is immersed in the fuel F.

  That is, the lower canister 2 and the upper canister 3 are both immersed in the fuel F in the fuel tank 1, and the lower canister 2 and the upper canister 3 are kept warm by the fuel F in the fuel tank 1, so that the purge operation is performed. It is possible to sufficiently exhibit the desorption performance of the evaporated fuel at the time.

  When the fuel level in the fuel tank 1 is the upper limit position shown in FIG. 2, the fuel F supplied from the fuel supply pipe 4 to the fuel tank 1 is immersed in the fuel F in the fuel tank 1. It flows toward the top plate 31 of the case 30.

  Since the top plate 31 is not sunk in the fuel F, the fuel F supplied from the fuel supply pipe 4 to the fuel tank 1 hardly mixes with the fuel F existing in the fuel tank 1, and the upper case 30. In particular, since the upper canister 3 is effectively cooled when it hits the top plate 31 canister, the adsorption performance of the evaporated fuel can be sufficiently exhibited.

When the fuel level in the fuel tank 1 becomes lower than the upper limit position shown in FIG. 2 due to the consumption of the fuel F, the lid plate 34 of the upper case 30 is lowered as the fuel level in the fuel tank 1 is lowered. And the upper surface of the cover plate 24 of the lower case 20 are close to each other. At this time, the top plate 31 of the upper case 30 is immersed in the fuel F.

  That is, the lower canister 2 and the upper canister 3 are both immersed in the fuel F in the fuel tank 1, and the lower canister 2 and the upper canister 3 are kept warm by the fuel F in the fuel tank 1, so that the purge operation is performed. It is possible to sufficiently exhibit the desorption performance of the evaporated fuel at the time.

  When the fuel level position in the fuel tank 1 is intermediate between the upper limit position shown in FIG. 2 and the lower limit position shown in FIG. 1, the fuel F supplied from the fuel supply pipe 4 to the fuel tank 1 is the fuel tank 1. It flows toward the top plate 31 of the upper case 30 immersed in the fuel F inside.

  Since the top plate 31 is not sunk in the fuel F, the fuel F supplied from the fuel supply pipe 4 to the fuel tank 1 hardly mixes with the fuel F existing in the fuel tank 1, and the upper case 30. In particular, since the upper canister 3 is effectively cooled when it hits the top plate 31 canister, the adsorption performance of the evaporated fuel can be sufficiently exhibited.

  In the present embodiment, an atmospheric port forming member 26 is provided in the lower side case 20 constituting the lower side canister 2, and a tank port forming member 36 and a purge port forming member 37 are provided in the upper side case 30 constituting the upper side canister 3. It is set as the structure which provides. Instead of such a configuration, a tank port forming member 36 and a purge port forming member 37 are provided in the lower case 20 constituting the lower canister 2, and an atmospheric port is provided in the upper case 30 constituting the upper canister 3. A configuration in which the forming member 26 is provided can also be adopted.

  As described above, the evaporative fuel processing apparatus according to the present invention has an effect that the performance of the canister can be sufficiently exhibited according to the fuel liquid level position in the fuel tank as compared with the conventional one. In particular, the present invention is useful for an evaporative fuel processing apparatus equipped in an internal combustion engine for driving a vehicle that is operated with a highly volatile fuel.

DESCRIPTION OF SYMBOLS 1 Fuel tank 2 Lower side canister 3 Upper side canister 4 Refueling pipe 25 Guide member 26 Atmospheric port formation member 35 Stopper 36 Tank port formation member 37 Purge port formation member 40 Expansion / contraction piping

Claims (8)

A lower-side canister and an upper-side canister that are disposed in the fuel tank and adsorb the evaporated fuel generated in the fuel tank;
An evaporative fuel processing apparatus comprising: an oil supply pipe for supplying fuel from outside the fuel tank into the fuel tank;
The lower caster is fixed to the fuel tank,
The evaporative fuel processing apparatus, wherein the upper side canister is configured to approach and move away from the lower side canister according to a fuel liquid level position in the fuel tank.   The evaporative fuel processing apparatus according to claim 1, wherein the upper canister is configured to float in the fuel by buoyancy received from fuel in the fuel tank.   The evaporative fuel processing device according to claim 1, wherein an opening end of the fuel supply pipe on the downstream side in the fuel flow direction is configured to face an upper surface of the upper canister.   The evaporative fuel processing apparatus according to any one of claims 1 to 3, further comprising a stopper that regulates a moving range of the upper side canister.   The evaporative fuel processing apparatus according to any one of claims 1 to 4, further comprising a guide member that guides the upper canister in a vertical direction.   The evaporative fuel processing device according to any one of claims 1 to 5, wherein the lower canister and the upper canister are configured to communicate with each other through an expansion pipe. . An air port is formed in the lower canister,
The evaporated fuel processing apparatus according to claim 6, wherein a tank port and a purge port are formed in the upper canister. A tank port and a purge port are formed in the lower side canister,
The evaporated fuel processing apparatus according to claim 6, wherein an atmospheric port is formed in the upper canister.

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