JP6987203B1 - Fuel supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fuel supply device having improved assemblability while being miniaturized. SOLUTION: A flange provided with a discharge flow path for closing an opening of a fuel tank and discharging fuel, and a first end portion are held by the flange, fuel is sucked and boosted, and the fuel is provided at the second end portion. A case member having a fuel pump that discharges fuel from the discharged portion, a case member that accommodates the fuel pump, supports the second end portion of the fuel pump, and has a discharge connecting portion connected to the discharge portion of the fuel pump, and a first unit. A pump case that is arranged away from the two ends and has a fuel passage connected to the discharge connecting portion and has a cover member welded to the case member, a fuel gauge that detects the fuel level height, and a fuel gauge. A joint member for attaching the fuel gauge to the pump case is provided, and the first locking portion to be locked to the pump case in the joint member is between the second end portion excluding the discharge portion and the welded portion of the pump case. Is locked to the portion of the case member that supports the second end portion. [Selection diagram] Fig. 3

Description

The present application relates to a fuel supply device.

The fuel supply device is a device that pumps fuel stored inside the fuel tank to an engine provided outside the fuel tank. The fuel supply device used for a vehicle such as a two-wheeled vehicle is inserted into the inside of the fuel tank from the bottom surface of the fuel tank due to the structure of the vehicle body. Then, assuming that the fuel supply device is installed so as to stand up from the bottom surface of the fuel tank, each part constituting the fuel supply device is designed.

Such a fuel supply device includes a flange that closes the opening of the fuel tank, a fuel pump that boosts and discharges fuel, a suction filter that filters fuel sucked into the fuel pump, and fuel discharged from the fuel pump. It consists of a high-pressure filter for filtering, a pump case that houses and supports the fuel pump and the high-pressure filter, and a fuel gauge that detects the liquid level height of the fuel stored inside the fuel tank using a float. In order to enable the fuel supply device to be installed in the limited space inside the fuel tank, there is an increasing demand for miniaturization of the fuel supply device. In addition, there are increasing demands for vehicles and fuel supply devices to improve vibration resistance to withstand vibration during driving and to reduce prices so that they can respond to various driving environments such as driving on rough roads and for competitions. There is.

A fuel supply device including a liquid level detection device capable of easily arranging a float in a limited space inside a fuel tank, which is different for each fuel tank, is disclosed (see, for example, Patent Document 1). Since the fuel gauge holding component is installed at the upper end of the fuel supply device, the float of the fuel gauge can be easily arranged in the limited space inside the fuel tank, which is different for each fuel tank.

Japanese Unexamined Patent Publication No. 2019-196726

In Patent Document 1, even if the shape of the fuel tank is different, the float of the fuel gauge can be easily arranged inside the fuel tank in the limited space of the fuel tank. However, since the parts constituting the fuel supply device are stacked on the upper part of the fuel supply device, the interference between the opening of the fuel tank and the fuel supply device is suppressed, but the height of the fuel supply device increases, so that the fuel is supplied. There was a problem that the device could not be miniaturized. Further, a fuel passage is formed inside the pump case by welding the case body and the cover member constituting the pump case, but in the welding process, other members are formed around the welding surface between the case body and the cover member. Since there are restrictions on assembly such as avoiding the arrangement of the fuel supply device, there is a problem that the miniaturization of the fuel supply device is hindered and the assembly of the fuel supply device becomes complicated.

Therefore, an object of the present application is to obtain a fuel supply device having improved assemblability while being miniaturized.

The fuel supply device disclosed in the present application closes an opening provided in the fuel tank, and holds a flange provided with a discharge flow path for discharging fuel from the inside to the outside of the fuel tank, and a first end portion held by the flange. A fuel pump that sucks fuel to boost the pressure and discharges fuel from a discharge portion provided at the second end opposite to the first end, and a fuel pump that accommodates the fuel pump and is the second end of the fuel pump. It is provided with a case member having a discharge connecting portion connected to the discharge portion of the fuel pump while supporting the portion, and a fuel passage arranged apart from the second end portion excluding the discharge portion and connected to the discharge connecting portion. A pump case having a cover member welded to the case member, a fuel gauge for detecting the liquid level height of the fuel inside the fuel tank, and a joint member for attaching the fuel gauge to the pump case are provided in the joint member. The first locking portion that is locked to the pump case is locked to the portion of the case member that supports the second end portion between the portion of the second end portion excluding the discharge portion and the welded portion of the pump case. Has been done.

According to the fuel supply device disclosed in the present application, the first locking portion of the joint member for attaching the fuel gauge to the pump case is the second end portion of the fuel pump excluding the discharge portion and the case member in the pump case. And because it is locked to the part of the case member that supports the second end between the welded part of the cover member, the parts are not stacked on the cover member and the height of the fuel supply device increases. Since there is no need to do so, the fuel supply device can be miniaturized. Further, since the portion of the case member to which the first locking portion is locked and the first locking portion are arranged so as not to interfere with the welded portion of the case member and the cover member, the case member and the cover member are welded in the assembly. The process can be facilitated and the assemblability of the fuel supply device can be improved.

It is a top view which shows the outline of the fuel supply apparatus which concerns on Embodiment 1. FIG. It is sectional drawing of the fuel supply apparatus cut at the cross-sectional position AA of FIG. It is an exploded perspective view which shows the outline of the fuel supply apparatus which concerns on Embodiment 1. FIG. It is sectional drawing which shows the outline of another fuel supply apparatus which concerns on Embodiment 1. FIG.

Hereinafter, the fuel supply device according to the embodiment of the present application will be described with reference to the drawings. In each figure, the same or corresponding members and parts will be described with the same reference numerals.

Embodiment 1.
1 is a plan view showing an outline of the fuel supply device 1 according to the first embodiment, FIG. 2 is a cross-sectional view of the fuel supply device 1 cut at the AA cross-sectional position of FIG. 1, and FIG. 3 is the first embodiment. An exploded perspective view showing an outline of the fuel supply device 1, FIG. 4 is a cross-sectional view showing an outline of another fuel supply device 1 according to the first embodiment, which is cut at a position equivalent to the AA cross-sectional position of FIG. be. In FIG. 3, among the parts constituting the fuel supply device 1, the fuel gauge 9, the joint member 10, and the cover member 12 are shown in an exploded manner. In FIGS. 2, 3 and 4, the float 9a of the fuel gauge 9 is omitted. The fuel supply device 1 is arranged inside the fuel tank 2 as shown in FIG. 2, and discharges the fuel stored inside the fuel tank 2 to an engine (not shown) provided outside the fuel tank 2. It is a device for pumping via 3a.

<Fuel supply device 1>
The fuel supply device 1 includes a flange 3, a fuel pump 4, a pump case 5, a suction filter 6, a high pressure filter 7, a pressure regulator 8, a fuel gauge 9, and a joint member 10. Due to the structure of the vehicle body, the fuel supply device 1 used for a vehicle such as a two-wheeled vehicle is inserted into the fuel tank 2 through the opening 2a on the bottom surface of the fuel tank 2 and arranged in the fuel tank 2. The arrangement of the fuel supply device 1 in the fuel tank 2 is not limited to the bottom surface of the fuel tank 2, and may be another location of the fuel tank 2.

The flange 3 closes the opening 2a provided on the bottom surface of the fuel tank 2. The portion of the flange 3 attached to the opening 2a of the fuel tank 2 is the installation surface 3c of the flange 3. The flange 3 is manufactured by molding with a resin such as polyoxymethylene (hereinafter referred to as POM), for example. The flange 3 includes a discharge pipe 3a which is a discharge flow path. The discharge pipe 3a discharges the fuel pumped by the fuel pump 4 from the inside to the outside of the fuel tank 2. Further, the flange 3 includes an electric connector 3b used for connecting electric wiring. The electric connector 3b supplies power to the fuel pump 4 via a lead wire (not shown). Further, the electric connector 3b outputs the detection signal output from the fuel gauge 9 to the outside.

The fuel pump 4 is formed in a cylindrical shape, the first end portion 4a is held by the flange 3, the fuel is sucked and boosted, and the discharge is provided at the second end portion 4b opposite to the first end portion 4a. Fuel is discharged from the part 4c. The first end portion 4a is connected to the suction filter 6 and has a suction portion 4d for sucking fuel. The fuel pump 4 has a terminal (not shown) connected to the electric connector 3b, and the fuel is sucked and boosted by a rotating member such as an impeller that is provided inside and is rotated by a motor drive. The suction filter 6 for filtering the fuel sucked by the fuel pump 4 is provided to prevent clogging inside the fuel pump 4. The suction filter 6 removes relatively large foreign matter mixed in the fuel inside the fuel tank 2.

The pump case 5 in which the fuel pump 4 is held by the pump holding portion 11a and the fuel flow path is formed inside includes the case member 11 and the cover member 12. The case member 11 and the cover member 12 are manufactured by molding with a resin such as POM, for example. As shown in FIG. 3, the pump case 5 is locked by an outer wall portion 3d erected from the installation surface 3c of the flange 3 attached to the fuel tank 2 and a snap fit 11a1 provided by, for example, the pump holding portion 11a. The case member 11 accommodates the fuel pump 4 in a cylindrical pump holding portion 11a. As shown in FIG. 2, the case member 11 supports the second end portion 4b of the fuel pump 4 by the pump support portion 11b. The case member 11 has a discharge connecting portion 11c connected to the discharge portion 4c of the fuel pump 4 via an O-ring. Since the case member 11 supports the second end portion 4b by the pump support portion 11b, the axial movement of the tubular fuel pump 4 can be suppressed from the side of the second end portion 4b. Since the movement of the fuel pump 4 in the axial direction is suppressed, the vibration resistance of the fuel pump 4 can be improved.

The cover member 12 includes a fuel passage 12a which is arranged apart from the second end portion 4b excluding the discharge portion 4c and is connected to the discharge connecting portion 11c. The cover member 12 is welded to the case member 11 by hot plate welding or the like. By welding the case member 11 and the cover member 12, the fuel flow path is sealed. The fuel that has passed through the fuel pump 4 is turned back at the fuel passage 12a and heads toward the opening 2a of the fuel tank 2. The case member 11 has a filter accommodating portion 11d for accommodating the high voltage filter 7. The high pressure filter 7 is connected to the fuel passage 12a and filters the fuel that has passed through the fuel passage 12a. As shown in FIG. 1, the case member 11 includes a first outlet 11e for pumping fuel from which foreign matter has been removed by the high-pressure filter 7 to the engine, and a second outlet 11f for discharging excess fuel to the fuel tank 2. The first outlet 11e is connected to the flange 3 via a sealing. The second outlet 11f is connected to the pressure regulator 8. The pressure regulator 8 regulates the pressure of the surplus fuel and discharges the regulated surplus fuel to the fuel tank 2.

The fuel gauge 9 detects the liquid level height of the fuel stored inside the fuel tank 2 by the float 9a provided via the float arm 9c. The detection signal corresponding to the liquid level height of the fuel output from the fuel gauge 9 is output to the outside via the electric connector 3b.

<Joint member 10>
The joint member 10 which is a main part of the present application will be described. The joint member 10 is a member that attaches the fuel gauge 9 to the pump case 5. The joint member 10 is manufactured by molding with a resin such as POM, for example. As shown in FIG. 2, the first locking portion 10b locked to the pump case 5 in the joint member 10 is a portion of the second end portion 4b excluding the discharge portion 4c, and the case member 11 and the cover in the pump case 5. It is locked to the pump support portion 11b, which is a portion of the case member 11 that supports the second end portion 4b, between the welded portion of the member 12 (horizontal plane B described later). The discharge portion 4c provided at the second end portion 4b of the fuel pump 4 is arranged adjacent to the filter accommodating portion 11d. With this arrangement, the length of the fuel passage 12a can be shortened, and a space is provided in the upper portion of the pump support portion 11b of the case member 11 in FIG. 2, so that the joint member 10 is arranged at this portion. According to this configuration, since the parts are not stacked on the cover member 12, the height of the fuel supply device 1 does not increase, so that the fuel supply device 1 can be miniaturized. Further, since the generation of an invalid space in which the parts are not arranged is suppressed around the fuel supply device 1, the fuel supply device 1 can be miniaturized.

The joint member 10 is erected in a direction perpendicular to the second end portion 4b of the fuel pump 4, and is a fixed wall arranged between the discharge portion 4c of the second end portion 4b and the outer peripheral portion of the second end portion 4b. 10a is provided. As shown in FIG. 3, the fuel gauge 9 is attached to the fixed wall 10a by a plurality of snap fits 9b. According to this configuration, since the fixed wall 10a is provided inside the second end portion 4b with respect to the outer peripheral portion of the second end portion 4b, the fuel supply device 1 can be miniaturized. Further, since the fuel gauge 9 is fixed to the fixed wall 10a by a plurality of snap fits 9b, the fixed wall 10a receives the centrifugal force generated by the float arm 9c of the fuel gauge 9 at a plurality of locations. The holding strength of the fuel gauge 9 can be improved. The arrangement of the fixed wall 10a in the joint member 10 is not limited to this, and the fixed wall 10a may be arranged at another position depending on the position where the float 9a of the fuel gauge 9 is arranged inside the fuel tank 2. I do not care.

In FIGS. 2 and 3, the portion indicated by the alternate long and short dash line is the horizontal plane B where the welded portions of the case member 11 and the cover member 12 are located. The two first locking portions 10b of the joint member 10 each include a first snap fit 10d, as shown in FIG. The first locking portion 10b is locked to the pump support portion 11b by inserting and fitting the first snap fit 10d into the respective gaps of the guide portions 11b1 and 11b2 provided in the pump support portion 11b. To. The direction in which the pump support portion 11b and the first snap fit 10d are fitted is parallel to the installation surface 3c of the flange 3 attached to the opening 2a of the fuel tank 2. The direction in which the pump support portion 11b and the first snap fit 10d are fitted is not limited to the direction parallel to the installation surface 3c, and is, for example, the direction perpendicular to the installation surface 3c (direction of arrow C shown in FIG. 3). ) May be. In the present embodiment, the joint member 10 includes two first locking portions 10b, but the number of first locking portions 10b is not limited to two, and may be one or three or more. I do not care.

According to this configuration, the first locking portion 10b and the pump support portion 11b are not provided on the horizontal plane B, and the first locking portion 10b and the pump support portion 11b are arranged so as not to interfere with the horizontal plane B. The welding process between the case member 11 and the cover member 12 in the above can be facilitated. Since the welding process is easy, the assemblability of the fuel supply device 1 can be improved. Further, since the first snap fit 10d is inserted into the gap between the guide portions 11b1 and 11b2 and fitted, the first locking portion 10b suppresses the movement of the joint member 10 to fix the joint member 10. Can be done. Since the movement of the joint member 10 is suppressed, the vibration resistance of the fuel gauge 9 fixed to the joint member 10 can be improved. Further, since the direction in which the pump support portion 11b and the first snap fit 10d are fitted is parallel to the installation surface 3c of the flange 3, the first snap fit 10d and the installation surface 3c are arranged in parallel. , It is possible to suppress the expansion of the radial size of the pump case 5. Further, after assembling the fuel supply device 1, it is possible to easily visually inspect the presence or absence of a half-locked state in which the first snap-fit 10d is not normally locked.

The joint member 10 includes a second locking portion 10c. The second locking portion 10c is locked to the cover member 12 on the side of the cover member 12 with respect to the welded portion of the case member 11 and the cover member 12 in the pump case 5. The second locking portion 10c of the joint member 10 includes a second snap fit 10e that fits into the cover member 12. The portion of the cover member 12 to be fitted with the second snap fit 10e is a fitting portion 12b provided on the side surface of the cover member 12. The direction in which the cover member 12 and the second snap-fit 10e are fitted is parallel to the installation surface 3c of the flange 3. The direction in which the cover member 12 and the second snap-fit 10e are fitted is not limited to the direction parallel to the installation surface 3c, and is, for example, the direction perpendicular to the installation surface 3c (direction of arrow C shown in FIG. 3). It doesn't matter.

According to this configuration, the second locking portion 10c is not provided on the horizontal plane B, and the second locking portion 10c is arranged so as not to interfere with the horizontal plane B. Therefore, the case member 11 and the cover member 12 in the assembly The welding process can be facilitated. Since the welding process is easy, the assemblability of the fuel supply device 1 can be improved. Further, since the joint member 10 is fixed to the pump case 5 at two points, the first locking portion 10b and the second locking portion 10c, the holding strength of the joint member 10 and the fuel gauge 9 can be improved, and the joint can be jointed. Even if the member 10 is miniaturized, sufficient holding strength of the fuel gauge 9 can be ensured. Since the holding strength of the joint member 10 and the fuel gauge 9 is improved, the vibration resistance of the joint member 10 and the fuel gauge 9 can be improved. Further, since the direction in which the cover member 12 and the second snap fit 10e are fitted is parallel to the installation surface 3c of the flange 3, the second snap fit 10e and the installation surface 3c are arranged in parallel. It is possible to suppress the expansion of the radial size of the pump case 5. Further, after assembling the fuel supply device 1, it is possible to easily visually inspect whether or not the second snap-fit 10e is in a half-locked state in which the second snap-fit 10e is not normally locked.

In the present embodiment, the joint member 10 includes a first locking portion 10b and a second locking portion 10c, and is fixed to the pump case 5 at two locations, the first locking portion 10b and the second locking portion 10c. However, the configuration for fixing the joint member 10 to the pump case 5 is not limited to this. As shown in FIG. 4, the joint member 10 may be configured to include only the first locking portion 10b and to be fixed to the pump case 5 only by the first locking portion 10b.

<Assembly of fuel supply device 1>
In FIG. 3, the order of assembling the fuel gauge 9, the joint member 10, and the cover member 12 shown in an exploded manner will be described. First, the cover member 12 is welded to the case member 11 by hot plate welding or the like. Next, the fuel gauge 9 is attached to the fixed wall 10a of the joint member 10 by a plurality of snap fits 9b. Next, the first locking portion 10b and the second locking portion 10c provided by the joint member 10 are locked to the pump support portion 11b of the case member 11 and the fitting portion 12b of the cover member 12, respectively, to lock the joint member. 10 is fixed to the pump case 5.

According to this assembly order, the cover member 12 can be welded to the case member 11 in a state where no other member is arranged on the horizontal plane B, so that the welding process between the case member 11 and the cover member 12 in the assembly is facilitated. Can be done. Since the welding process is easy, the assemblability of the fuel supply device 1 can be improved. The post-assembly visual inspection for confirming the state in which the first locking portion 10b and the second locking portion 10c are locked to each of the case member 11 and the cover member 12 is indicated by the arrow C shown in FIG. This can be done only by looking down at the fuel supply device 1 from one direction. Since the visual inspection can be performed only from one direction, the time required for the inspection can be shortened. Since the inspection time is shortened, the productivity of the fuel supply device 1 can be improved, and the manufacturing cost of the fuel supply device 1 can be reduced.

As described above, in the fuel supply device 1 according to the first embodiment, the first locking portion 10b of the joint member 10 for attaching the fuel gauge 9 to the pump case 5 is the second end of the fuel pump 4 excluding the discharge portion 4c. It is locked to the pump support portion 11b, which is a portion of the case member 11 that supports the second end portion 4b, between the portion of the portion 4b and the welded portion of the case member 11 and the cover member 12 in the pump case 5. Therefore, since the parts are not stacked on the cover member 12 and the height of the fuel supply device 1 does not increase, the fuel supply device 1 can be miniaturized. Further, since the pump support portion 11b and the first locking portion 10b to which the first locking portion 10b is locked are arranged so as not to interfere with the welded portions of the case member 11 and the cover member 12, the case member 11 and the case member 11 in assembly are arranged. The welding process with the cover member 12 can be facilitated, and the assemblability of the fuel supply device 1 can be improved.

The joint member 10 includes a second locking portion 10c, and the second locking portion 10c is locked to the cover member 12 on the side of the cover member 12 from the welded portion of the case member 11 and the cover member 12 in the pump case 5. If this is the case, the second locking portion 10c is arranged so as not to interfere with the welded portion of the case member 11 and the cover member 12, so that the welding process between the case member 11 and the cover member 12 in assembly can be facilitated. The assemblability of the fuel supply device 1 can be improved. Further, since the joint member 10 is fixed to the pump case 5 at two points, the first locking portion 10b and the second locking portion 10c, the holding strength of the joint member 10 and the fuel gauge 9 can be improved, and the joint can be jointed. Even if the member 10 is miniaturized, sufficient holding strength of the fuel gauge 9 can be ensured.

When the direction in which the pump support portion 11b and the first snap fit 10d are fitted is parallel to the installation surface 3c of the flange 3, the first snap fit 10d and the installation surface 3c are arranged in parallel, so that the pump It is possible to suppress the expansion of the radial size of the case 5. Further, after assembling the fuel supply device 1, it is possible to easily visually inspect the presence or absence of a half-locked state in which the first snap-fit 10d is not normally locked. Further, when the direction in which the cover member 12 and the second snap fit 10e are fitted is parallel to the installation surface 3c of the flange 3, the second snap fit 10e and the installation surface 3c are arranged in parallel. It is possible to suppress the expansion of the radial size of the pump case 5. Further, after assembling the fuel supply device 1, it is possible to easily visually inspect whether or not the second snap-fit 10e is in a half-locked state in which the second snap-fit 10e is not normally locked.

The joint member 10 is erected in a direction perpendicular to the second end portion 4b of the fuel pump 4, and the fixed wall 10a is arranged between the discharge portion 4c of the second end portion 4b and the outer peripheral portion of the second end portion 4b. When the fuel gauge 9 is attached to the fixed wall 10a, the fixed wall 10a is provided inside the outer peripheral portion of the second end portion 4b, so that the fuel supply device 1 can be miniaturized. ..

Also, although various exemplary embodiments have been described in the present application, the various features, embodiments, and functions described in one or more embodiments may be limited to the application of a particular embodiment. It is applicable to the examples alone or in various combinations.
Therefore, innumerable variations not exemplified are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 fuel supply device, 2 fuel tank, 2a opening, 3 flange, 3a discharge pipe, 3b electric connector, 3c installation surface, 3d outer wall, 4 fuel pump, 4a 1st end, 4b 2nd end, 4c discharge , 4d suction part, 5 pump case, 6 suction filter, 7 high pressure filter, 8 pressure regulator, 9 fuel gauge, 9a float, 9b snap fit, 9c float arm, 10 joint member, 10a fixed wall, 10b first locking , 10c 2nd locking part, 10d 1st snap fit, 10e 2nd snap fit, 11 case member, 11a pump holding part, 11a1 snap fit, 11b pump support part, 11b1 guide part, 11b2 guide part, 11c Discharge connecting part, 11d filter accommodating part, 11e first outlet, 11f second outlet, 12 cover member, 12a fuel passage, 12b fitting part

Claims (5)

A flange provided with a discharge flow path that closes the opening provided in the fuel tank and discharges fuel from the inside to the outside of the fuel tank.
A fuel pump whose first end is held by the flange, sucks fuel to boost the pressure, and discharges fuel from a discharge portion provided at the second end opposite to the first end.
A case member that houses the fuel pump, supports the second end of the fuel pump, and has a discharge connecting portion connected to the discharge portion of the fuel pump, and the second end excluding the discharge portion. A pump case having a fuel passage, which is arranged apart from the portion and is connected to the discharge connecting portion, and has a cover member welded to the case member.
A fuel gauge that detects the height of the fuel level inside the fuel tank, and
A joint member for attaching the fuel gauge to the pump case is provided.
The first locking portion to be locked to the pump case in the joint member is the second end portion between the second end portion excluding the discharge portion and the welded portion of the pump case. A fuel supply device that is locked to a portion of the case member that supports it. The joint member includes a second locking portion.
The fuel supply device according to claim 1, wherein the second locking portion is locked to the cover member on the side of the cover member with respect to the welding portion of the pump case. The first locking portion of the joint member comprises a first snap fit that fits into the portion of the case member.
Claim 1 or claim that the direction in which the portion of the case member and the first snap fit are fitted is parallel to the installation surface of the flange, which is the portion of the flange attached to the opening of the fuel tank. 2. The fuel supply device according to 2. The second locking portion of the joint member comprises a second snap fit that fits into the cover member.
The fuel supply according to claim 2, wherein the direction in which the cover member and the second snap fit are fitted is parallel to the installation surface of the flange, which is a portion of the flange attached to the opening of the fuel tank. Device. The joint member is erected in a direction perpendicular to the second end portion of the fuel pump, and is a fixed wall arranged between the discharge portion of the second end portion and the outer peripheral portion of the second end portion. Equipped with
The fuel supply device according to any one of claims 1 to 4, wherein the fuel gauge is attached to the fixed wall.

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