JP5338733B2 - Fuel supply device - Google Patents

Description

  The present invention relates to a fuel supply device that is held in an opening of a fuel tank of a motorcycle or the like and sends fuel out of the fuel tank.

  Conventional fuel supply devices for motorcycles generally include a pump unit, a motor unit that drives the pump unit, and a stator unit that constitutes the motor unit so as to cover an opening provided in the fuel tank. It is composed of a flange portion fixed to the tank, and in recent years, various proposals have been made due to demands for miniaturization and weight reduction.

  Also, a discharge pipe for sending pressurized fuel discharged from the fuel supply device to the engine, a connector connected to an external electric circuit, and a flange portion for attaching a motor portion for driving the pump portion to the fuel tank are integrated. There has been proposed a method in which a stator core around which a coil is wound is integrally insert-molded during the molding process (see, for example, Patent Document 1 and FIG. 1).

JP 2009-2222055 A

Conventional fuel supply devices are configured as described above, but there are motorcycles with a displacement of 50 cc to a large size of 2000 cc, and these fuel supply devices supply fuel according to the displacement. Therefore, it is necessary to change the specifications of the stator unit, the motor unit, and the pump unit according to the supply amount.
However, in the conventional fuel supply device, the flange portion and the motor portion are integrally formed, and there is a problem that a flange portion integrated by various moldings must be prepared according to the displacement. there were.

  The present invention has been made to solve the above-described problems. A housing in which a pump part and a motor part are integrally molded, and a flange part in which a discharge pipe and a connector are integrally molded are attached to a fuel tank. By adopting a form that can be connected to each other at the same time, even if the housing changes according to the specifications, the flange part can be shared, so that it can respond to various displacements and reliably supply power to the motor part. It is providing the fuel supply apparatus which can be performed.

  A fuel supply device according to the present invention includes a motor unit that drives a pump unit, and a flange unit that holds the pump unit and the motor unit and covers an opening provided in the fuel tank and is fixed to the fuel tank. In the fuel supply device for sending the fuel in the fuel tank to the outside of the fuel tank via the discharge pipe, the power supply means for supplying power to the discharge pipe and the motor portion to the flange of the flange portion, the pump portion and the motor portion are held For this purpose, a flange-side coupling portion that is extended is integrally formed, and a stator-molded coil and a stator core that form a motor portion and a housing-side coupling portion that is coupled to the flange-side coupling portion are integrated with the housing. Is formed.

  In the fuel supply device of the present invention, a housing in which a pump part and a motor part are integrally molded and a flange in which a discharge pipe and a connector are integrally molded are combined with each other, so that the dimensions of the housing differ depending on the displacement. Also in this case, the flange portion can be shared, and a fuel supply device that can cope with various displacements and can reliably supply power to the motor portion can be provided.

It is a longitudinal cross-sectional view of the fuel supply apparatus in Embodiment 1 of this invention. It is a principal part enlarged view of FIG. It is a partially broken sectional view of the flange side coupling | bond part of FIG. It is a perspective view of the housing side coupling | bond part of FIG. It is a longitudinal cross-sectional view of the other Example in Embodiment 1 of this invention. It is a principal part enlarged view of the fuel supply apparatus in Embodiment 2 of this invention. It is a side view of the flange side coupling | bond part of FIG. It is a perspective view of the housing side coupling | bond part of FIG. It is a longitudinal cross-sectional view of the fuel supply apparatus in Embodiment 3 of this invention.

Embodiment 1 FIG.
1 is a longitudinal sectional view of a fuel supply apparatus according to Embodiment 1 of the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a partially broken sectional view of a flange side coupling portion, and FIG. FIG. 5 is a longitudinal sectional view of another embodiment.

The configuration of the fuel supply apparatus 100 according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4.
For example, in a motorcycle, the fuel supply device 100 is suspended from an opening 2a of a fuel tank 2 that stores fuel 1, and includes a pump unit 20, a motor unit 30 that is a drive source of the pump unit 20, and a fuel tank. 2 and a flange portion 40 serving as an attachment member to 2.
The pump unit 20 is configured by housing the impeller 5 in the pump base 3 and the pump cover 4, and the pump type in the fuel supply device 100 according to the embodiment of the present invention is a so-called turbine pump.

  The impeller 5 formed in a disk shape is accommodated so as to be sandwiched from both the front and back sides by the pump base 3 and the pump cover 4, and the center portion engages with a shaft 9 c of the rotor portion 9, which will be described later. It is supported by a bearing 6 fixed to the shaft and is formed to be rotatable. The pump base 3 and the pump cover 4 are clamped by a pump holder 18, and the pump holder 18 is fixed by engaging with a hole 10c provided at one end of the housing 10 described later by a snap fit. A suction port 4 a that sucks the fuel 1 in the fuel tank 2 is disposed on the fuel tank 2 side (the lower side in FIG. 1) of the pump cover 4.

C-shaped pump flow paths 20 a are formed on the outer peripheral side of the impeller 5 and on the side of the pump base 3 and the pump cover 4 facing the impeller 5, and the fuel 1 in the fuel tank 2 is transferred to the pump cover 4. It is filtered by the combined suction filter 7, flows in from the suction port 4 a, is pressurized while flowing in the pump flow path 20 a by the rotation of the impeller 5, and is pumped to the motor unit 30 side.
The fuel pressure-fed from the pump unit 20 to the motor unit 30 passes between a stator core 8a and a rotor unit 9 described later (FIG. 2), and passes through a communication channel 11f formed in a flange unit 40 described later. 11d (FIG. 1).

The motor unit 30 employs a brushless motor and is fixed to the outer peripheral surface of the stator unit 8 including a stator core 8a made of a magnetic material and a coil 8b wound around the stator core 8a, and a cylindrical rotor core 9a. The rotor 9 is composed of a magnet 9b and a shaft 9c fitted into the center of the rotor core 9a.
The rotor portion 9 is rotatably installed on the inner periphery of the stator core 8a, and the shaft 9c is rotatably supported by a bearing 6 (shown in FIG. 1).
The magnet 9b is a plastic magnet formed into a cylindrical shape by kneading magnetic powder into a thermoplastic resin material such as PPS (polyphenylene sulfide), and alternately in the rotational direction on the outer peripheral surface facing the stator core 8a. Magnetized to form different magnetic poles.

  In addition, the stator core 8a (FIG. 2) is formed by caulking magnetic steel plates laminated in the axial direction, and teeth 8c protruding toward the center side of the motor unit 30 have, for example, six angular intervals in the circumferential direction. Individually formed. The stator core 8a is provided with an insulator 8d made of an insulating material so as to cover the surface thereof, and a coil 8b is wound around the insulator 8d. The coil 8b is supplied with, for example, a star connection so that a three-phase alternating current is supplied from a control device (not shown) to generate a rotating magnetic field in the circumferential direction, and is connected to three load terminals 12a, 12b, and 12c described later (FIG. 2). ).

The housing 10 is made of, for example, a thermoplastic resin such as polyacetal resin, and is electrically connected to the stator core 8a, the coil 8b, and the coil 8b, and is disposed on the outer periphery of the housing side coupling portion 10a described later. 12a, 12b, 12c and the stator portion 8 are integrally inserted and molded, and since the resin material is filled, the fuel does not directly contact the coil 8b, and even if deteriorated fuel or low quality fuel is used. The corrosion of the coil 8b can be prevented.
On the opposite side (upward in FIG. 1) of the pump portion 20 of the housing 10, there is a housing side coupling portion 10 a that is detachably formed on a flange side coupling portion 11 e of the flange portion 40 described later. Engaging recesses 10a1 are arranged at a pitch of approximately 120 degrees on the inner periphery of the portion 10a (see FIG. 4).

  The flange portion 40 is a connector portion which is a power supply means having a discharge pipe 11a for sending pressurized fuel to an engine (not shown) via a fuel pipe (not shown) and a terminal 11b1 for supplying power to the coil 8b. 11b is composed of, for example, a flange 11 integrally molded with a thermoplastic resin material such as PPS resin or POM resin, and the flange 11 is orthogonal to the axial direction (vertical direction in FIG. 1). It is formed in a flat plate shape, is fitted into the circular opening 2a of the fuel tank 2, and is not shown in the state where the flat plate portion is sandwiched between the outer surface of the fuel tank 2 and closely adhered. It is fixed to the fuel tank 2 by fastening with a fixing bracket or the like. A communication passage 11f is formed at the center of the flange 11 to allow fuel filtered by a discharge filter 16 described later to communicate with the fuel passage 11d.

  A check valve 13 is disposed in the middle of the fuel passage 11d. The check valve 13 includes a valve body 13a, a valve seat 13b, and a valve spring 13c. A coil spring is used for the spring 13c, and the check valve 13 is in a compressed state when the check valve 13 is completed. Yes. The valve body 13a is in contact with the valve seat 13b by the elastic force of the spring 13c. During the operation of the fuel supply device 100, the fuel passage 11d that acts on the valve body 13a by the fuel pressure discharged from the pump unit 20 is provided. The force in the direction toward the downstream side (left side in FIG. 1) overcomes the elastic force of the spring 13 c, the valve body 13 a is separated from the valve seat 13 b, and the fuel flows to the discharge pipe 11.

  On the other hand, when the fuel supply device 100 is stopped, the fuel passage 10d is blocked by the check valve 13 because the valve body 13a is in contact with the valve seat 13b by the elastic force of the spring 13c. Therefore, the fuel in the fuel passage 10d on the downstream side of the check valve 13a and the fuel pipe (not shown) connected to the discharge pipe 11a does not return to the fuel tank 2 via the fuel supply device 100 but remains there. And the pressurized fuel pressure is also maintained. Therefore, at the next engine start, the fuel is immediately supplied to the engine so that the engine can be started quickly.

Furthermore, a pressure regulating valve 14 is arranged in the fuel passage 11d downstream of the check valve 13 in the direction of the fuel tank 2 (downward in FIG. 1).
The pressure regulating valve 14 includes a valve body 14a, a valve seat 14b, and a spring 14c. In this case, a coil spring is used as the spring 14c, and in a completed state of the pressure regulating valve 14, the spring 14c is in a compressed state. The pressure regulating valve 14 adjusts the fuel pressure sent from the fuel supply device 100 to a desired pressure. Here, the desired pressure is the fuel pressure required from the engine side. In the pressure regulating valve 14, the contact / separation state between the valve body 14a and the valve seat 14b is determined based on the magnitude relationship between the force acting on the valve body 14a by the fuel pressure and the elastic force of the spring 14c.

  That is, when the fuel pressure in the fuel passage 11d is equal to or lower than the desired pressure, the valve body 14a contacts the valve seat 14b and the pressure regulating valve 14 is closed. When the fuel pressure in the fuel passage 11d exceeds the desired pressure, the valve body 14a is separated from the valve seat 14b, the pressure regulating valve 14 is opened, and a part of the fuel in the fuel passage 11d passes through the pressure regulating valve 14. Returning to the inside of the fuel tank 2, that is, the low pressure region, the fuel pressure in the fuel passage 11d is maintained at a desired pressure. The housing 10 on the fuel tank 2 side of the pressure regulating valve 14 is provided with a through hole 10b at a position corresponding to the pressure regulating valve 14, and the fuel discharged from the pressure regulating valve 14 passes through the through hole 10b and the fuel tank. Returned to 2.

As is apparent from FIGS. 1 to 3, the flange 11 of the flange portion 40 is extended with a flange-side coupling portion 11 e in which a housing-side coupling portion 10 a of the housing 10 is detachably formed. Engagement projections 11e1 are arranged at a pitch of approximately 120 degrees on the outer periphery of the flange side coupling portion 11e, and this engages with the engagement recess 10a1 of the housing side coupling portion 10a described above by snap fit. ing.
Further, a power supply terminal electrically connected to the terminal 11b1 on the outer periphery of the flange side coupling portion 11e and electrically connected to the load terminals 12a, 12b and 12c when the flange side coupling portion 11e is coupled to the housing side coupling portion 10a. 17a, 17b, and 17c are disposed (see FIG. 3).
Reference numeral 15a denotes an O-ring which is an airtight member, and performs airtightness of the joint between the flange side joint 11e and the housing side joint 10a.

Further, a discharge filter 16 for filtering the fuel 1 sent out of the fuel tank 2 is disposed inside the flange side coupling portion 11e. The discharge filter 16 is a filter medium formed in a chrysanthemum tube shape or a roll shape, and is disposed concentrically with respect to the cylindrical shape of the rotor portion 9, and the fuel flowing between the stator core 8 a and the rotor portion 9 is Since it flows to the discharge filter 16 in the direction of arrow A, arrow B, and arrow C (FIG. 2) and flows uniformly in the circumferential direction of the discharge filter 16, there is an effect that pressure loss is reduced.
In addition, a communication passage 11f is disposed substantially at the center of the discharge filter 16, and since the rotor portion 9, the discharge filter 16, and the communication passage 11f are formed linearly, the fuel passes smoothly, so that the pressure loss Is small. In addition, the nonwoven fabric is used for the filter medium and the filtration performance is excellent with respect to the mesh filter etc.

Next, the operation of the fuel supply apparatus 100 configured as described above will be described. A drive current is supplied from a control circuit (not shown) to the coil 8b through the power supply terminals 17a, 17b, 17c and the load terminals 12a, 12b, 12c from the connector 11b, and is applied to the teeth 8c on the facing surface facing the rotor portion 9 of the stator portion 8. A rotating magnetic field is generated.
The magnet 9 disposed in the rotor part 9 rotates following the magnetic pole, the impeller 5 engaged with the shaft 9c of the rotor part 9 also rotates, and a swirling flow is generated in the C-shaped pump flow path 20a. .
The fuel 1 in the fuel tank 2 flows in from the suction port 4a provided in the pump cover 4 through the suction filter 7, and is pressurized while flowing in the pump flow path 20a by the rotation of the impeller 5, and the motor unit 30 side (FIG. 1 is pumped to the upper part of the pump unit 20.

The fuel 1 pumped to the motor portion 30 side passes between the stator core 8a and the rotor portion 9, flows into the communication passage 11f formed in the flange portion 40 via the fuel filter 16, and further flows into the fuel passage 11d. Supplied. The fuel flowing into the fuel passage 11d is regulated to a desired pressure by the pressure regulating valve 14, and is discharged from the discharge pipe 11a to an internal combustion engine such as a vehicle engine (not shown).
While the fuel supply device 100 is stopped, the fuel in the fuel passage 11d on the downstream side and the fuel pipe (not shown) connected to the discharge pipe 11a is held at the pressurized fuel pressure by the check valve 13. The

FIG. 5 shows another embodiment for explaining the effect of the present invention.
The above-described fuel supply device shown in FIGS. 1 to 4 has a relatively small displacement, for example, for a 50 cc to 250 cc motor vehicle, but the one in FIG. It is a fuel supply apparatus corresponding to the quantity of vehicles.
In FIG. 5, reference numeral 80 denotes a stator portion, which has substantially the same outer diameter as the stator portion 8 described above, but has a long overall length. Reference numeral 90 denotes a rotor portion, which has substantially the same outer diameter as the rotor portion 9 described above, but has a long overall length.
The housing 100 and the stator core are also formed with a long overall length and are integrally molded with resin.

  In the fuel supply apparatus configured as described above, the stator portion 80 and the rotor portion 90 are formed longer than the stator portion 8 and the rotor portion 9 described above, and a control circuit (not shown) is connected to the coil of the stator portion 80 from the terminal 11b1. When the drive current is supplied, the magnetic force generated in the teeth of the facing surface facing the rotor portion 90 of the stator portion 80 is strong, the rotational torque generated in the rotor portion 90 is large, and the rotational speed can be increased. The discharge amount discharged from the discharge pipe 11a is also increased, and can be adapted to a vehicle with a large displacement.

As described above, according to the fuel supply device in Embodiment 1 of the present invention, by using the stator portion 80 and the rotor portion 90 properly, it is possible to respond to various displacements without preparing various flange portions 40. A fuel supply device can be provided.
Further, power terminals 17a, 17b, and 17c are provided on the outer periphery of the flange side coupling portion 11e, and load terminals 12a, 12b that are in contact with and electrically connected to the power terminals 17a, 17b, and 17c on the inner periphery of the housing side coupling portion 10a. Since 12c is provided, the power supply terminals 17a, 17b, and 17c and the load terminals 12a, 12b, and 12c are simultaneously contacted and supplied from the connector 11b when the housing-side coupling part 10a is inserted into the flange-side coupling part 11e. Electric power is reliably supplied to the motor unit 30.

Embodiment 2. FIG.
The configuration of the fuel supply apparatus 200 according to Embodiment 2 of the present invention will be described.
6 is an enlarged view of a main part of the fuel supply device 200 according to Embodiment 2 of the present invention, FIG. 7 is a side view of the flange side coupling portion of FIG. 6, and FIG. 8 is a perspective view of the housing side coupling portion of FIG. is there.
In FIG. 6, only parts different from those in FIG. 1 are shown with reference numerals, and other configurations are the same as those in the first embodiment.

In FIG. 6, the housing 101 is formed by integrally molding a stator core 8a, a coil 8b, and load terminals 120a, 120b, 120c electrically connected to the coil 8b and disposed on the inner periphery of the housing side coupling portion 101a. Is formed.
7 and 8, the outer periphery of the flange side coupling portion 110e of the flange 110 is electrically connected to the terminal 11b1 (see FIG. 1), and the load is applied when the flange side coupling portion 110e is coupled to the housing side coupling portion 101a. Power supply terminals 170a, 170b, and 170c that are electrically connected to the terminals 120a, 120b, and 120c are provided.

The engaging projections 110e1 are arranged at a pitch of about 120 degrees on the inner periphery of the flange side coupling portion 110e, and the engagement concave portions 101a1 are arranged at a pitch of about 120 degrees on the inner circumference of the housing side coupling portion 101a. Therefore, the motor part 30 and the pump part 20 (refer FIG. 1) can be firmly fixed to the flange part 40. FIG.
Further, according to the fuel supply device in Embodiment 2 of the present invention, the power supply terminals 170a, 170b, and 170c are provided at a pitch of approximately 120 degrees on the outer periphery of the flange side coupling portion 110e, and the above described inner periphery of the housing side coupling portion 101a. The load terminals 120a, 120b, and 120c that contact the power terminals 170a, 170b, and 170c are provided at a pitch of approximately 120 degrees while being shifted from the engagement recess 101a1 by a predetermined angle. The elastic force of the portion 101a acts on the load terminals 120a, 120b, and 120c, and the power supply terminals 170a, 170b, and 170c and the load terminals 120a, 120b, and 120c come into contact with each other in a mechanically stable state and supplied from a connector (not shown) This ensures that the generated power is supplied to a motor unit (not shown) in a balanced manner. Having.

Embodiment 3 FIG.
A configuration of the fuel supply apparatus 300 according to Embodiment 3 of the present invention will be described.
FIG. 9 is a longitudinal sectional view of the fuel supply device according to the third embodiment of the present invention, in which only parts different from those in FIG. 1 are shown with reference numerals, and other configurations are the same as those of the first embodiment. .
In the fuel supply device according to the first or second embodiment of the present invention described above, the engaging convex portion 11e1 is provided by disposing the engaging convex portion 11e1 in the flange side coupling portion 11e and the engaging concave portion 101a1 in the housing side coupling portion 101a. The engaging recess 101a1 is engaged with the flange 19 by inserting the wire 19 into the flange side coupling portion 210e as shown in FIG. 210e may be melted and the housing-side coupling portion 201a may be welded and joined.

In this case, the load terminals 12a, 12b, and 12c are inserted into the power terminals 17a, 17b, and 17c and electrically connected, and then the flange side coupling portion 210e and the housing side coupling portion 201a are coupled by welding. In the state where the load terminals 12a, 12b, and 12c are fitted and inserted into 17b and 17c, since the housing 10 and the flange 11 are integrally formed, the flange side coupling portion 210e and the housing side coupling portion 201a are hot-wire welded. When they are melted by welding, they are welded and bonded to each other, so that the welding work can be easily performed.
The power terminals 17a, 17b, and 17c and the load terminals 12a, 12b, and 12c are approximately 120 degrees apart from the outer periphery of the flange side coupling portion 210e and the inner periphery of the housing side coupling portion 201a, respectively, as in the second embodiment. It may be provided and combined.

1 fuel, 1a discharge pipe, 1b connector, 1b1 terminal, 2 fuel tank,
2a opening, 3 pump base, 4 pump cover, 4a inlet,
5 Impeller, 6 Bearing, 7 Suction filter, 8 Stator part, 8a Stator core,
8b coil, 8c teeth, 8d insulator, 9 rotor part,
9a rotor core, 9b magnet, 9c shaft, 10 housing,
10a housing side coupling portion, 10a1 engagement recess, 10b through hole,
11 flange, 11a discharge pipe, 11b connector, 11b1 plate terminal,
11b2 power terminal, 11c bearing holder, 11d fuel passage,
11e flange side coupling part, 11e1 engagement convex part, 11f communication path,
12a, 12b, 12c Load terminal, 13 Check valve, 13a Valve body, 13b Valve seat,
13c spring, 14 pressure regulating valve, 14a valve body, 14b valve seat,
14c Spring, 15 Packing, 16 Discharge filter, 16a Filter paper,
17a, 17b, 17c power supply terminal, 18 pump holder, 20 pump part,
20a Pump flow path, 30 motor part, 40 flange part, 80 stator part,
90 rotor part, 100 fuel supply device, 101 housing,
101a housing side coupling portion, 101a1 engagement recess, 110 flange,
110e flange side coupling part, 110e1 engagement convex part,
120a, 120b, 120c load terminals,
170a, 170b, 170c power supply terminal, 200 fuel supply device,
201a Housing side coupling | bond part, 210e Flange side coupling | bond part, 300 Fuel supply apparatus.

Claims (9)

A motor unit that drives the pump unit, and a flange unit that holds the pump unit and the motor unit and covers the opening provided in the fuel tank so as to cover the fuel tank. In a fuel supply device for sending fuel out of the fuel tank via a discharge pipe,
A power supply means for supplying power to the discharge pipe and the motor unit, and a flange side coupling portion extended to hold the pump unit and the motor unit are integrally formed on the flange of the flange unit, and the motor A fuel supply device, wherein a stator part obtained by molding a coil forming a part and a stator core and a housing side coupling part coupled to the flange side coupling part are integrally formed in the housing. 2. The fuel supply device according to claim 1, wherein an engagement convex portion is provided in the flange-side coupling portion, and an engagement concave portion that engages with the engagement convex portion is provided in the housing-side coupling portion. The engaging projections are arranged at a pitch of about 120 degrees on the outer peripheral surface of the flange side coupling portion, and the engagement concave portions are arranged at a pitch of about 120 degrees on the inner circumference of the housing side coupling portion. The fuel supply device according to claim 2. A power supply terminal is provided on the outer periphery of the flange side coupling portion, a load terminal in contact with the power supply terminal is provided on the outer periphery of the housing side coupling portion, and the flange side coupling portion is coupled to the housing side coupling portion. The fuel supply device according to claim 2, wherein a power supply terminal is electrically connected to the load terminal. Power supply terminals are provided on the outer periphery of the flange side coupling portion at a pitch of approximately 120 degrees, load terminals arranged at a pitch of approximately 120 degrees on the inner periphery of the housing side coupling portion are provided to contact the power supply terminal, and the flange side coupling The fuel supply device according to claim 2, wherein the power terminal is electrically connected to the load terminal when a portion is coupled to the housing side coupling portion. 2. The housing according to claim 1, wherein a stator core, a coil, and a load terminal electrically connected to the coil and disposed on an outer periphery of the housing side coupling portion are integrally formed by insert molding. The fuel supply device described in 1. The fuel supply device according to any one of claims 1 to 6, wherein a discharge filter for filtering the fuel sent out of the fuel tank is disposed inside the flange-side coupling portion. . The discharge filter is a filter medium formed in a chrysanthemum tube shape or a roll shape, and is arranged concentrically with respect to a cylindrical shape of a rotor portion that rotates by receiving a magnetic field generated in the stator portion. The fuel supply device according to claim 7. The fuel supply device according to claim 8, wherein the filter medium is a nonwoven fabric.

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