JP2011226449A - Fuel supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fuel supply apparatus capable of suppressing the inclination of a shaft centered on a portion of the shaft positioned inside a bearing.SOLUTION: The fuel supply apparatus includes: a rotor 14 having the shaft 27 and a magnet 28; a stator 13 having a core 25 arranged opposing the magnet 28 and a coil 26; a plate 23 fixed to the shaft 27; the bearing 16a supporting the shaft 27; a cylinder 18a into which fuel is supplied; a piston 19a inserted into the cylinder 18a; and a spring 20a energizing the piston 19a. The magnet 28 has a recessed part 28a which makes the shaft 27 generate a turning force centered on a portion of the shaft 27 positioned inside the bearing 16a by the magnetic force generated between the magnet 28 and the core 25, the plate 23 is arranged so as to incline relative to a plane vertical to the axal line of the shaft 27 and presses the piston 19a by rotation.

Description

  The present invention relates to a fuel supply device that compresses and sends fuel from a fuel tank to a fuel injection device.

  2. Description of the Related Art Conventionally, a fuel supply device having a shaft that rotates by driving a motor is known. The shaft is rotatably supported by a bearing fixed to the housing. A plate is fixed to the tip of the shaft. The plate is disposed to be inclined with respect to a plane perpendicular to the axis of the shaft. A cylinder, a piston that is inserted into the cylinder and whose head is pressed against the plate, and a spring that urges the piston in the direction in which the piston is removed from the cylinder are arranged at a position farther away from the bearing in the axial direction of the shaft. Has been. A plurality of cylinders, pistons and springs are arranged side by side in the circumferential direction of the shaft. The plate is rotated by the rotation of the shaft, and the plate presses the piston against the biasing force of the spring so that the piston reciprocates in the cylinder (see, for example, Patent Document 1).

JP 2010-1766

  However, when the stroke of some of the plurality of pistons is a compression stroke that compresses fuel, the stroke of the other pistons is a suction stroke that sucks fuel, so the force that the plate receives from each piston is It depends on each piston. As a result, an offset load is applied to the plate, and a force is applied to the shaft to incline about the portion of the shaft inside the bearing. Since the shaft rotates in a state where a force for inclining is applied about the portion of the shaft inside the bearing, the shaft precesses. As a result, there has been a problem that the uneven rotation of the shaft increases, the generation of noise due to the collision between the bearing and the shaft, the vibration of the fuel supply device increases, and the occurrence of uneven wear of the bearing.

  The present invention provides a fuel supply device that can suppress the tilting of the shaft around the portion of the shaft inside the bearing.

  A fuel supply device according to the present invention includes a rotor having a shaft and a magnet provided around the shaft and fixed to the shaft, and a radial direction of the shaft provided away from the magnet. A stator having a core disposed oppositely and a coil for magnetizing the core, a plate provided away from the magnet in the axial direction of the shaft, and fixed to the shaft; the magnet; A bearing provided between the plate and rotatably supporting the shaft; a cylinder provided in the axial direction of the shaft that is provided farther from the magnet than the plate; A piston inserted inside and the piston in a direction in which the piston is pulled out of the cylinder An urging body that urges the magnet, and the magnet generates a rotational force around the shaft portion inside the bearing by the magnetic force generated between the magnet and the core. A rotating power generating section, and the plate is disposed to be inclined with respect to a plane perpendicular to the axis of the shaft, and rotates so that the piston reciprocates within the cylinder. The piston is pressed against the urging force.

  According to the fuel supply device of the present invention, the rotating force generator of the magnet causes the rotating force of the shaft centering on the shaft portion inside the bearing to the shaft by the magnetic force generated between the magnet and the core. Because the force received by the plate from the piston prevents the shaft from tilting around the shaft part inside the bearing, the shaft part inside the bearing is It is possible to suppress the shaft from tilting to the center.

It is a block diagram which shows the fuel system which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the fuel supply apparatus of FIG. It is a perspective view which shows the rotor and plate of FIG. It is a graph which shows the relationship between the rotor rotation angle of the fuel supply apparatus of FIG. 2, and piston lift amount. It is a top view which shows a plate and piston when the rotor rotation angle of FIG. 4 is A angle. It is a top view which shows a plate and piston when the rotor rotation angle of FIG. 4 is B angle. It is sectional drawing which shows the fuel supply apparatus which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the fuel supply apparatus which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the shaft, magnet, resin member, and plate of the fuel supply apparatus which concerns on Embodiment 4 of this invention. It is a top view which shows a mode that the magnet of the fuel supply apparatus which concerns on Embodiment 5 of this invention is magnetized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
1 is a block diagram showing a fuel system according to Embodiment 1 of the present invention. In the figure, a fuel tank 1 for storing fuel is provided with a filter 2 for removing foreign substances contained in the fuel when the fuel passes through the inside. One end of a low-pressure fuel pipe 3 is inserted into the fuel tank 1. The filter 2 is disposed inside the low pressure fuel pipe 3. Thereby, the foreign material contained in the fuel is removed by the fuel passing through the low-pressure fuel pipe 3.

  A fuel supply device 4 is connected to the other end of the low-pressure fuel pipe 3. The fuel supply device 4 sucks fuel from the fuel tank 1 through the low-pressure fuel pipe 3, compresses the sucked fuel, and discharges the compressed fuel. One end of a high-pressure fuel pipe 5 is connected to the fuel supply device 4.

  A fuel injection device 6 is connected to the other end of the high-pressure fuel pipe 5. The fuel discharged by the fuel supply device 4 is supplied to the fuel injection device 6 through the high-pressure fuel pipe 5. The fuel injection device 6 injects fuel into an intake pipe (not shown).

  The high-pressure fuel pipe 5 is provided with a pressure adjusting device 7 that adjusts the pressure of the fuel discharged from the fuel supply device 4. A low-pressure fuel pipe 8 is provided between the pressure regulator 7 and the fuel tank 1 to allow the fuel discharged from the pressure regulator 7 to flow to the fuel tank 1 when the fuel pressure is regulated.

  The drive of the fuel supply device 4 and the fuel injection device 6 is controlled by the control device 9. The fuel supply device 4 receives a drive signal from the control device 9. The fuel supply device 4 is driven by a drive signal from the control device 9 to suck in fuel, compress the sucked fuel, and discharge the compressed fuel. The fuel injection device 6 receives a drive signal from the control device 9 based on the engine speed, the load amount, and the like. In the fuel injection device 6, the injection timing and the injection amount are controlled by the drive signal of the control device 9.

  The fuel system includes a fuel tank 1, a filter 2, a low pressure fuel pipe 3, a fuel supply device 4, a high pressure fuel pipe 5, a fuel injection device 6, a pressure adjustment device 7, a low pressure fuel piping 8 and a control device 9.

  FIG. 2 is a cross-sectional view showing the fuel supply device 4 of FIG. In the figure, a fuel supply device 4 includes a motor unit 10 whose drive is controlled by a control device 9 (FIG. 1), and sucks fuel by driving the motor unit 10, compresses the sucked fuel, and compresses the compressed fuel. And a pump unit 11 for discharging.

  The motor unit 10 includes a motor housing 12, a stator (stator) 13 fixed to the motor housing 12 inside the motor housing 12, a rotor (rotor) 14 provided inside the stator 13, It has a partition 15 provided between the rotor 14 and a pair of bearings 16 a and 16 b fixed to the partition 15.

  The pump unit 11 includes a pump housing 17 that is overlapped with the motor housing 12 via the partition wall 15, three cylinders 18 a, 18 b, 18 c that are fixed to the pump housing 17 inside the pump housing 17, and a cylinder 18 a, Three pistons 19a, 19b, 19c inserted inside 18b, 18c, and three springs (biasing bodies) 20a provided across the cylinders 18a, 18b, 18c and the pistons 19a, 19b, 19c , 20b, 20c, a suction valve 21 for adjusting the suction of fuel into the cylinders 18a, 18b, 18c, a discharge valve 22 for adjusting the discharge of fuel outside the cylinders 18a, 18b, 18c, and the rotor 14 Plate 23 provided on the wall, and an O-ring 2 provided between the partition wall 15 and the pump housing 17. And it has a door.

  The stator 13 includes a cylindrical core 25 and a coil 26 that is provided in the core 25 and magnetizes the core 25 when energized. The core 25 is a laminated steel plate configured by stacking a plurality of electromagnetic steel plates. A plurality of coils 26 are arranged side by side in the circumferential direction of the core 25. The coil 26 has a plurality of phases. The phase of the coil 26 to be excited is switched by the drive signal from the control device 9. As a result, a rotating magnetic field is generated in the coil 26.

  The rotor 14 includes a shaft 27 that is rotatably supported by the bearings 16 a and 16 b, a magnet 28 that is provided around the shaft 27, and a resin member 29 that fixes the magnet 28 to the shaft 27. The shaft 27 is disposed so that the axis of the shaft 27 overlaps with the axis of the core 25. The magnet 28 is composed of a plurality of magnet pieces arranged in the circumferential direction of the shaft 27. The magnet 28 is not limited to a magnet composed of a plurality of magnet pieces, and may be a magnet formed in a ring shape, for example.

  The core 25 is disposed away from the magnet 28 in the radial direction of the shaft 27. The core 25 is disposed in the radial direction of the shaft 27 so as to face the magnet 28. The magnet 28 and the core 25 are formed so that the dimension of the magnet 28 in the axial direction of the shaft 27 matches the dimension of the core 25 in the axial direction of the shaft 27. The magnet 28 is arranged so that the entire area of the outer peripheral surface of the magnet 28 faces the core 25.

  The resin member 29 is in contact with both end faces of the magnet 28 in the axial direction of the shaft 27. Thereby, the movement of the magnet 28 relative to the resin member 29 in the axial direction of the shaft 27 is prevented. The magnet 28 is fixed to the shaft 27 via the resin member 29 by insert resin molding. The magnet 28 has a concave portion (rotational power generating portion) 28 a at the end of the magnet 27 in the axial direction of the shaft 27 on the side opposite to the pump portion 11.

  The partition wall 15 includes a cylindrical insertion portion 30 inserted inside the core 25 and a flange portion 31 protruding from the insertion portion 30 to the outside in the radial direction of the shaft 27. The flange portion 31 is arranged at a portion of the insertion portion 30 on the pump portion 11 side. The insertion portion 30 is formed with an insertion hole 30 a extending in the axial direction of the core 25 from the flange portion 31 side to the anti-pump portion 11 side. The partition 15 is formed by molding using a resin material so as not to affect the magnetic field.

  The rotor 14 is inserted into the insertion hole 30a. The bearings 16a and 16b and the magnet 28 are disposed inside the insertion hole 30a. The bearing 16 a is disposed between the magnet 28 and the plate 23. The bearing 16 b is arranged farther from the bearing 16 a than the magnet 28. In this example, plain bearings are used as the bearings 16a and 16b. In addition, you may use a rolling bearing as bearing 16a, 16b.

  A through hole extending in the axial direction of the shaft 27 is formed in the bearing 16a. When the fuel is supplied to the pump unit 11 through the through hole, the insertion hole 30a is filled with fuel.

  The flange portion 31 includes a first fitting portion 31 a that is fitted to the inner wall of the motor housing 12 and a second fitting portion 31 b that is fitted to the inner wall of the pump housing 17. By fitting the first fitting portion 31 a to the inner wall of the motor housing 12, the partition body 15 is prevented from moving with respect to the motor housing 12 in the radial direction of the shaft 27. By fitting the second fitting portion 31 b to the inner wall of the pump housing 17, the partition body 15 is prevented from moving with respect to the pump housing 17 in the radial direction of the shaft 27. Thereby, the state which arranged the motor housing 12 and the pump housing 17 on the same axis mutually is maintained.

  The fuel in the pump unit 11 is prevented from entering the core 25 and the coil 26 by the partition wall 15. This prevents the core 25 and the coil 26 from being corroded by the fuel.

  The pump housing 17 is formed with a suction port 17 a for sucking fuel from the fuel tank 1 and a discharge port 17 b for discharging fuel to the fuel injection device 6.

  The cylinders 18 a, 18 b, and 18 c are arranged farther from the magnet 28 than the plate 23 in the axial direction of the shaft 27. The cylinders 18 a, 18 b, and 18 c are composed of a bottom plate 32 and a cylinder body 33 that is stacked on the bottom plate 32. The cylinder body 33 is formed with a suction flow path through which fuel sucked into the pump housing 17 from the suction port 17a flows into the cylinders 18a, 18b, 18c. The bottom plate 32 is formed with a discharge passage for allowing fuel to flow from the inside to the outside of the cylinders 18a, 18b, 18c. The intake valve 21 adjusts the intake of fuel into the cylinders 18a, 18b, and 18c by opening and closing the intake passage. The discharge valve 22 adjusts the discharge of fuel to the outside of the cylinders 18a, 18b, 18c by opening and closing the discharge flow path. The cylinders 18a, 18b, 18c are arranged at equal intervals in the circumferential direction of the shaft 27.

  The pistons 19a, 19b, 19c are inserted into the cylinders 18a, 18b, 18c from the motor unit 10 side. The cylinders 18a, 18b, 18c and the pistons 19a, 19b, 19c form three pressure increasing chambers 34 in which fuel is compressed. The springs 20a, 20b, and 20c urge the pistons 19a, 19b, and 19c in the direction in which the pistons 19a, 19b, and 19c are removed from the cylinders 18a, 18b, and 18c. The suction valve 21 opens the suction flow path during the suction stroke in which the fuel that has entered the pump housing 17 from the suction port 17a is sent to the pressure increasing chamber 34. The discharge valve 22 opens the discharge flow path when discharging the fuel compressed in the pressure increasing chamber 34 and discharging the fuel from the port 17b to the outside of the pump housing 17.

  The plate 23 is disposed away from the magnet 28 in the axial direction of the shaft 27 and is fixed to the shaft 27. The plate 23 is disposed so as to be inclined with respect to a plane perpendicular to the axis of the shaft 27. The plate 23 rotates about the axis of the shaft 27 by the rotation of the shaft 27. The plate 23 rotates against the urging force of the springs 20a, 20b, 20c so that the pistons 19a, 19b, 19c reciprocate in the cylinders 18a, 18b, 18c as the plate 23 rotates. Press.

  The O-ring 24 is disposed in a groove formed in the second fitting portion 31 b of the flange portion 31. The fuel in the pump unit 11 is prevented from leaking from between the partition wall 15 and the pump housing 17 by the O-ring 24.

  The magnetic pole position of the magnet 28 is determined relative to the position of the plate 23. In this example, when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27, the closest magnetic field 23a, which is the portion of the plate 23 closest to the cylinders 18a, 18b, 18c, and the polar magnetic field of the magnet 28 match. I am letting. When the magnet 28 is magnetized, the magnet 28 can be magnetized at a predetermined relative position with respect to the closest portion 23 a of the plate 23 by positioning the plate 23 with respect to the magnetizing yoke. In this way, the relationship between the load application state to the plate 23 and the motor generated torque is managed by managing the closest approach portion 23a of the plate 23 and the magnetized position of the magnet 28 within a predetermined range. Can do. As a result, it is possible to suppress the occurrence of variation in solids in the manufactured fuel supply device 4.

  FIG. 3 is a perspective view showing the rotor 14 and the plate 23 of FIG. In the drawing, the rotor 14 rotates counterclockwise when viewed from the motor unit 10 toward the pump unit 11 in the axial direction of the shaft 27. The concave portion 28a includes a reference plane including the most spaced portion 23b, which is the portion of the plate 23 farthest from the cylinders 18a, 18b, and 18c (FIG. 2), and the axis of the shaft 27, and the shaft 27 with the shaft 27 as the center. It is arranged between a rotation surface obtained by rotating the reference surface by a predetermined angle in the rotation direction. The concave portion 28 a is disposed in a portion of the magnet 28 on the side of the most separated portion 23 b when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27.

  The portion of the magnet 28 sandwiched between the reference surface and the rotation surface has a magnetic force weaker than the other portions of the magnet 28 due to the formation of the recess 28 a. Since the motor torque is reduced by forming the recess 28a in the magnet 28, it is desirable that the predetermined angle rotated from the reference surface to the rotation surface is as small as possible. In this example, the predetermined angle rotated from the reference plane to the rotation plane is set to an angle that does not exceed 120 °.

  A resin member 29 is filled in the recess 28a. Thereby, the imbalance of the inertia moment of the rotor 14 centering on the axis line of the shaft 27 which generate | occur | produces by forming the recessed part 28a in the magnet 28 is reduced. Further, movement of the magnet 28 relative to the resin member 29 in the circumferential direction of the shaft 27 is prevented.

  Next, the operation will be described. FIG. 4 is a graph showing the relationship between the rotor rotation angle and the piston lift amount of the fuel supply device 4 of FIG. 2, and FIG. 5 is the plate 23 and pistons 19a, 19b, 19c when the rotor rotation angle of FIG. FIG. In the figure, the plate 23 passes through the closest portion 23 a and the farthest separated portion 23 b and borders on the plane along the axis of the shaft 27, and the portion of one plate 23 is the compression portion 23 c and the other plate 23. The part has a suction part 23d.

  In FIG. 5, the compression portion 23 c has pistons 19 a, 19 b, against the urging force of the springs 20 a, 20 b, 20 c (FIG. 2) so as to compress the fuel in the pressure increasing chamber 34 as the plate 23 rotates. Press. As the plate 23 rotates, the suction portion 23d moves in a direction in which the portion of the suction portion 23d that presses the piston 19c moves away from the cylinder 18c (FIG. 2). As a result, the piston 19c moves in the direction of being pulled out of the cylinder 18c by the urging force of the spring 20c. As a result, fuel is sucked into the pressure increasing chamber 34.

  The strokes of the pistons 19a and 19b are compression strokes. The stroke of the piston 19c is a suction stroke. Of the forces received from the pistons 19a, 19b and 19c of the plate 23, the forces received from the pistons 19a and 19b in the compression stroke are larger than the forces received from the piston 19c in the suction stroke. Among the forces received from the pistons 19a and 19b of the plate 23, the force received from the piston 19a that is closer to the closest portion 23a is larger than the force received from the piston 19b. Thereby, an offset load is applied to the plate 23. As a result, a force is applied to the shaft 27 to incline about the portion of the shaft 27 inside the bearing 16a. At this time, the moment of the force acting on the shaft 27 is a tilting moment Mp in which the portion of the shaft 27 on the side opposite to the plate 23 from the bearing 16a is inclined toward the suction portion 23d with the bearing 16a as the center.

  The both end faces of the magnet 28 in the axial direction of the shaft 27 and the both end faces of the core 25 in the axial direction of the shaft 27 coincide with each other. Further, the magnet 28 is an anti-pump portion of the magnet in the axial direction of the shaft 27. Since the concave portion 28a is provided at the end portion on the 11th side, the portion of the magnet 28 in which the concave portion 28a is formed is shifted from the core 25 in the axial direction of the shaft 27 toward the bearing 16a side. . As a result, a force that separates from the bearing 16 a in the axial direction of the shaft 27 is applied to the portion of the magnet 28 in which the recess 28 a is formed due to the magnetic attraction generated between the core 25 and the magnet 25. As a result, the shaft 27 generates a rotational force that rotates around the bearing 16a. The moment of the force acting on the shaft 27 becomes a canceling moment Mr centering on the bearing 16a and the portion of the shaft 27 on the side opposite to the plate 23 from the bearing 16a is inclined toward the compression portion 23c. The tilting moment Mp is reduced by the canceling moment Mr. As a result, the tilting of the shaft 27 around the portion of the shaft 27 inside the bearing 16a is suppressed.

  FIG. 6 is a plan view showing the plate 23 and the pistons 19a, 19b, and 19c when the rotor rotation angle of FIG. 4 is the B angle. In the figure, the compression portion 23c presses the piston 19b. The suction part 23d presses the pistons 19a and 19c. Accordingly, an eccentric load is applied to the plate 23, and a force that tilts about the portion of the shaft 27 inside the bearing 16a is applied to the shaft 27. At this time, the moment of the force acting on the shaft 27 is a tilting moment Mp in which the portion of the shaft 27 on the side opposite to the plate 23 from the bearing 16a is inclined toward the suction portion 23d with the bearing 16a as the center. That is, as the plate 23 rotates, the direction of the tilting moment Mp changes in the circumferential direction of the shaft 27.

  Since the magnet 28 rotates together with the plate 23, the direction of the canceling moment Mr also changes in the circumferential direction of the shaft 27. That is, although the tilting moment Mp is changed by the rotation of the plate 23, the canceling moment Mr is also changed at the same time, so that the shaft 27 is always prevented from being tilted around the portion of the shaft 27 inside the bearing 16a. .

  As described above, according to the fuel supply device 4 according to Embodiment 1 of the present invention, the concave portion 28a of the magnet 28 is located inside the bearing 16a by the magnetic force generated between the magnet 28 and the core 25. Since the rotational force of the shaft 27 centering on the portion of the shaft 27 is generated in the shaft 27, the shaft 27 centering on the portion of the shaft 27 inside the bearing 16a by the force received by the plate 23 from the pistons 19a, 19b, 19c. By generating rotational force in the shaft 27 so as to prevent the inclination of the shaft 27, it is possible to suppress the inclination of the shaft 27 around the portion of the shaft 27 inside the bearing 16a. As a result, the rotation of the rotor 14 can be stabilized, pump operation noise and vibration of the fuel supply device 4 can be reduced, and uneven wear of the bearings 16a and 16b can be prevented. it can. By preventing uneven wear of the bearings 16a and 16b, the reliability of the bearings 16a and 16b can be improved. Thereby, the load reduction of the motor part 10 can be aimed at and the consumption current of the motor part 10 can be reduced. As a result, the amount of heat generated by the motor unit 10 is reduced, the amount of heat transferred from the motor unit 10 to the fuel is reduced, and a margin for the vaporization temperature of the fuel is obtained. The performance stability can be improved.

  Further, since the concave portion 28a is formed at the end of the magnet 28 in the axial direction of the shaft 27, the rotational power of the shaft 27 around the portion of the shaft 27 inside the bearing 16a without increasing the number of parts. Can be easily generated on the shaft 27.

  In the first embodiment of the present invention, the configuration in which the concave portion 28a is disposed at the end of the magnet 28 in the axial direction of the shaft 27 on the side opposite to the pump portion 11 has been described. However, the magnet in the axial direction of the shaft 27 is described. The structure by which the recessed part 28a is arrange | positioned at the edge part by the side of the pump part 11 of 28 may be sufficient. In this case, the recess 28a includes a reference surface including the closest portion 23a and the axis of the shaft 27, and a rotation surface obtained by rotating the reference surface by a predetermined angle in the rotation direction of the shaft 27 about the axis of the shaft 27. Between. Further, the recess 28 a is arranged in a portion on the closest approach portion 23 a side of the magnet 28 when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27.

Embodiment 2. FIG.
FIG. 7 is a cross-sectional view showing a fuel supply device 4 according to Embodiment 2 of the present invention. In the figure, the magnet 28 has a convex part (rotational power generating part) 28 b at the end of the magnet 27 in the axial direction of the shaft 27 on the pump part 11 side. The convex portion 28 b protrudes in the axial direction of the shaft 27 from the end surface on the pump portion 11 side of the core 25 in the axial direction of the shaft 27. Similar to the concave portion 28 a described in the first embodiment, the convex portion 28 b has a reference plane including the most spaced portion 23 b and the axis of the shaft 27, and a predetermined angle in the rotation direction of the shaft 27 around the axis of the shaft 27. It is arrange | positioned between the rotation surfaces which rotated only the reference plane. Further, the convex portion 28 b is disposed in a portion of the magnet 28 on the side of the most separated portion 23 b when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27. Other configurations are the same as those in the first embodiment.

  The end face of the magnet 28 in the axial direction of the shaft 27 and the end face of the core 25 in the axial direction of the shaft 27 coincide with each other. Further, the magnet 28 is located on the pump portion 11 side of the magnet in the axial direction of the shaft 27. Since the convex portion 28b is provided at the end, the portion of the magnet 28 where the convex portion 28b is formed is in a state of being displaced from the core 25 in the axial direction of the shaft 27 toward the bearing 16a. As a result, in the same manner as in the first embodiment, a force in a direction away from the bearing 16a is applied to the portion of the magnet 28 where the convex portion 28b is formed due to the magnetic attraction generated between the core 25 and the magnet 25. . As a result, the shaft 27 generates a rotational force that rotates around the bearing 16a.

  As described above, according to the fuel supply device 4 according to the second embodiment of the present invention, the convex portion 28b is formed at the end of the magnet 28 in the axial direction of the shaft 27. As with the fuel supply device 4 according to the above, it is possible to suppress the inclination of the shaft 27 around the portion of the shaft 27 inside the bearing 16a, and compared with the case where the recess 28a is formed in the magnet 28. The magnetic force of the magnet 28 can be prevented from decreasing.

  In the second embodiment of the present invention, the configuration in which the convex portion 28b is disposed at the end of the magnet 28 on the pump portion 11 side in the axial direction of the shaft 27 has been described. However, the magnet in the axial direction of the shaft 27 is described. The structure by which the convex part 28b is arrange | positioned at the edge part by the side of 28 anti-pump part 11 may be sufficient. In this case, the convex portion 28b is rotated by rotating the reference plane by a predetermined angle in the rotation direction of the shaft 27 around the axis of the shaft 27, and the reference plane including the closest portion 23a and the axis of the shaft 27. It is arranged between the faces. Further, the convex portion 28 b is disposed in a portion on the closest approach portion 23 a side of the magnet 28 when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27.

Embodiment 3 FIG.
FIG. 8 is a sectional view showing a fuel supply device 4 according to Embodiment 3 of the present invention. In the drawing, the magnet 28 has an inclined portion (rotational power generating portion) 28 c including an inclined surface at the end of the magnet 27 in the axial direction of the shaft 27 on the side opposite to the pump portion 11. The inclined surface of the inclined portion 28 c is inclined with respect to a surface perpendicular to the axis of the shaft 27. When the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27, the portion of the magnet 28 on the closest approach portion 23 a side of the magnet 28 is formed longer in the axial direction of the shaft 27 than the other portions of the magnet 28. Yes. Further, when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27, the portion of the magnet 28 on the closest approach portion 23 a side of the magnet 28 has both end surfaces in the axial direction of the shaft 27 in the axial direction of the shaft 27. It is formed so as to coincide with both end faces of the core 25.

  When the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27, the portion of the magnet 28 on the side of the most separated portion 23 b of the magnet 28 is formed shorter in the axial direction of the shaft 27 than the other portions of the magnet 28. Yes. Further, when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27, the portion of the magnet 28 on the side of the most distant portion 23 b of the magnet 28 has an end surface on the side opposite to the pump portion 11 in the axial direction of the shaft 27. It is located closer to the pump part 11 than the end face of the core 25 on the side opposite to the pump part 11 in the axial direction of 27. Other configurations are the same as those in the first embodiment.

  When the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27, the portion of the magnet 28 on the side of the most separated portion 23 b of the magnet 28 has an end surface on the side opposite to the pump portion 11 in the axial direction of the shaft 27. Since it is located closer to the pump part 11 than the end face of the core 25 opposite to the pump part 11 in the axial direction, the most spaced part of the magnet 28 when viewing the magnet 28 and the plate 23 in the axial direction of the shaft 27 The portion of the magnet 28 on the 23 b side is in a state of being shifted from the core 25 in the axial direction of the shaft 27 toward the bearing 16 a side. Thus, in the same manner as in the first embodiment, the portion of the magnet 28 on the side of the most separated portion 23b of the magnet 28 when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27 is located between the core 25 and the portion. A force in a direction away from the bearing 16a is applied by the generated magnetic attractive force. As a result, the shaft 27 generates a rotational force that rotates around the bearing 16a.

  As described above, according to the fuel supply device 4 according to Embodiment 3 of the present invention, the end of the magnet 28 in the axial direction of the shaft 27 is inclined with respect to the plane perpendicular to the axis of the shaft 27. Since the inclined portion 28c having the inclined surface is formed, it is possible to suppress the inclination of the shaft 27 about the portion of the shaft 27 inside the bearing 16a as in the fuel supply device 4 according to the first embodiment. In addition, the magnet 28 can be easily formed as compared with the case where the concave portion 28 a or the convex portion 28 b is formed in the magnet 28.

  In the third embodiment of the present invention, the configuration in which the inclined portion 28c is arranged at the end of the magnet 28 on the side opposite to the pump portion 11 in the axial direction of the shaft 27 has been described. The structure by which the inclination part was arrange | positioned at the edge part by the side of the pump part 11 of the magnet 28 may be sufficient. In this case, when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27, the portion of the magnet 28 on the closest approach portion 23 a side of the magnet 28 is shorter in the axial direction of the shaft 27 than the other portions of the magnet 28. It is formed. Further, when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27, the portion of the magnet 28 on the closest approach portion 23 a side of the magnet 28 is the end surface on the pump portion 11 side in the axial direction of the shaft 27. It is formed so as to be located on the side opposite to the pump part 11 from the end face on the pump part 11 side in the axial direction of the shaft 27.

Embodiment 4 FIG.
9 is a cross-sectional view showing a shaft 27, a magnet 28, a resin member 29, and a plate 23 of a fuel supply apparatus according to Embodiment 4 of the present invention. In the figure, the magnet 28 has a thin-walled portion (rotation power generating portion) 28d in the portion of the magnet 28 on the side of the most separated portion 23b of the magnet 28 when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27. ing. The thickness of the thin portion 28 d in the radial direction of the shaft 27 is formed thinner than the thickness of other portions of the magnet 28. As a result, the amount of magnetic flux in the thin portion 28d is lower than the amount of magnetic flux in other portions of the magnet. Other configurations are the same as those in the first embodiment.

  The magnetic force generated between the other portion of the magnet 28 and the core 25 is such that the amount of magnetic flux in the thin portion 28d is lower than the amount of magnetic flux in the other portion of the magnet 28. It becomes stronger than the generated magnetic force. Therefore, a force is applied to the magnet 28 in a direction in which the portion of the magnet 28 facing the thin portion 28d approaches the portion of the core 25 facing the portion. At this time, as in the first embodiment, the moment of the force acting on the shaft 27 is a canceling moment in which the portion of the shaft 27 on the side opposite to the plate 23 from the bearing 16a is inclined toward the compression portion 23c with the bearing 16a as the center. Mr. The tilting moment Mp is reduced by the canceling moment Mr. As a result, the tilting of the shaft 27 around the portion of the shaft 27 inside the bearing 16a is suppressed.

  As described above, according to the fuel supply device 4 according to Embodiment 4 of the present invention, the magnet 28 has a thin wall portion whose thickness in the radial direction of the shaft 27 is thinner than the thickness of other portions of the magnet 28. 28d, the shaft 27 can be prevented from tilting around the portion of the shaft 27 inside the bearing 16a as in the fuel supply device 4 according to the first embodiment. Compared with the case where the concave portion 28 a or the convex portion 28 b is formed in the magnetic field 28, the magnet 28 can be easily formed.

  In the fourth embodiment of the present invention, the configuration in which the magnet 28 has the thin portion 28d whose thickness in the radial direction of the shaft 27 is thinner than other portions of the magnet 28 has been described. The structure which has a thick part with the thickness about the radial direction of the shaft 27 larger than the other part may be sufficient. In this case, the thick portion is arranged in the portion of the magnet 28 on the closest approach portion 23 a side of the magnet 28 when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27.

Embodiment 5 FIG.
FIG. 10 is a plan view showing a state in which the magnet 28 of the fuel supply device according to Embodiment 5 of the present invention is magnetized. In the figure, the magnet 28 has a small magnetic part (rotation power generating part) 28e having a smaller magnetic force than other parts of the magnet 28. Since the small magnetic force portion 28e has a lower magnetic force than other portions of the magnet 28, a canceling moment Mr that reduces the tilting moment Mp is generated as in the fourth embodiment. As a result, the tilting of the shaft 27 around the portion of the shaft 27 inside the bearing 16a is suppressed.

  The magnetizing device 35 that magnetizes the magnet 28 has six magnetizing yokes 35a. The gap G2 between the small magnetic part 28e and the magnetized yoke 35a facing the small magnetic part 28e is wider than the gap G1 between the other part of the magnet 28 and the magnetized yoke 35a facing this part. ing. Thereby, the small magnetic part 28e can be easily formed in the magnet 28. Other configurations are the same as those in the fourth embodiment.

  As described above, according to the fuel supply device 4 according to the fifth embodiment of the present invention, the magnet 28 has the small magnetic part 28e having a smaller magnetic force than the other magnets 28. As with the fuel supply device 4 according to the fourth embodiment, the shaft 27 can be prevented from tilting around the portion of the shaft 27 inside the bearing 16a, and the thin portion 28d is formed in the magnet 28. As compared with the magnet 28, the magnet 28 can be easily formed.

  In the fifth embodiment of the present invention, the configuration in which the magnet 28 has the small magnetic part 28e having a magnetic force smaller than that of the other part of the magnet 28 has been described. May have a large magnetic force portion. In this case, the large magnetic force portion is disposed in the portion of the magnet 28 on the closest approach portion 23 a side of the magnet 28 when the magnet 28 and the plate 23 are viewed in the axial direction of the shaft 27.

  In the fifth embodiment of the present invention, the gap G2 between the small magnetic part 28e and the magnetized yoke 35a facing the small magnetic part 28e is such that the other part of the magnet 28 and the magnetized yoke facing this part. Although the configuration that is wider than the gap G1 between the magnetic field 35a and the small magnetic part 28e has been described, the number of coil turns of the magnetizing yoke 35a facing the small magnetic part 28e is reduced, so that the small magnetic part 28e is magnetized to reduce the magnetic force. It may be configured to.

  DESCRIPTION OF SYMBOLS 1 Fuel tank, 2 Filter, 3 Low pressure fuel piping, 4 Fuel supply apparatus, 5 High pressure fuel piping, 6 Fuel injection apparatus, 7 Pressure adjustment apparatus, 8 Low pressure fuel piping, 9 Control apparatus, 10 Motor part, 11 Pump part, 12 Motor housing, 13 Stator (stator), 14 Rotor (rotor), 15 Bulkhead, 16a Bearing, 16b Bearing, 17 Pump housing, 17a Suction port, 17b Discharge port, 18a cylinder, 18b cylinder, 18c cylinder, 19a Piston, 19b Piston, 19c Piston, 20a Spring (biasing body), 20b Spring (biasing body), 20c Spring (biasing body), 21 Suction valve, 22 Discharge valve, 23 Plate, 23a Nearest part, 23b The farthest part, 23c compression part, 23d suction part, 4 O-ring, 25 cores, 26 coils, 27 shafts, 28 magnets, 28a recesses (rotation power generation part), 28b protrusions (rotation power generation part), 28c inclined parts (rotation power generation part), 28d thin part (rotation) (Power generation part), 28e small magnetic force part (rotation power generation part), 29 resin member, 30 insertion part, 30a insertion hole part, 31 flange part, 31a first fitting part, 31b second fitting part, 32 Bottom plate, 33 cylinder body, 34 pressure increasing chamber, 35 magnetizing device, 35a magnetizing yoke.

Claims (5)

A rotor having a shaft and a magnet provided around the shaft and fixed to the shaft;
A stator having a core disposed away from the magnet in the radial direction of the shaft and disposed opposite to the magnet, and a coil for magnetizing the core;
A plate provided away from the magnet in the axial direction of the shaft and fixed to the shaft;
A bearing provided between the magnet and the plate and rotatably supporting the shaft;
A cylinder which is provided farther from the magnet than the plate in the axial direction of the shaft, and is supplied with fuel inside;
A piston inserted inside the cylinder;
An urging body that urges the piston in a direction in which the piston is removed from the cylinder;
The magnet has a rotating power generation unit that generates a rotating power around the shaft portion inside the bearing by the magnetic force generated between the magnet and the core.
The plate is disposed to be inclined with respect to a plane perpendicular to the axis of the shaft, and the piston is moved against the urging force of the urging body so that the piston reciprocates in the cylinder by rotating. A fuel supply device that is pressed.   2. The fuel supply device according to claim 1, wherein the rotating power generation unit is a concave portion or a convex portion formed at an end portion of the magnet in the axial direction of the shaft.   The rotating power generation portion is an inclined portion having an inclined surface formed at an end portion of the magnet in the axial direction of the shaft and inclined with respect to a plane perpendicular to the axis of the shaft. Item 4. The fuel supply device according to Item 1.   2. The fuel supply device according to claim 1, wherein the rotating power generation unit is a thick part or a thin part having a thickness in a radial direction of the shaft that is different from other parts of the magnet.   2. The fuel supply device according to claim 1, wherein the rotating power generation unit is a large magnetic force unit or a small magnetic force unit having a magnetic force different from that of other portions of the magnet.

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