JP2018066357A - Fuel pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel pump that drives a plunger for expanding or contracting the volume of a compression chamber by using electromagnetic force and increases the electromagnetic force caused by energization of a coil as much as possible.SOLUTION: In a fuel pump 20, an upstream side plunger 34 and a downstream side plunger 54 are driven by applying electromagnetic force to an upstream side movable element 40 and a downstream side movable element 60. By energizing a first coil 74, a magnetic flux flowing out from a first end portion 74a side of the first coil is guided to a downstream side contact portion Scd1 by a first core 72 and is caused to flow into the downstream side movable element 60. The magnetic flux caused to flow into the downstream side movable element 60 is caused to flow into a second core 82 via a downstream side contact portion Scd2 of an adjacent second core 82 and then flow through a second coil 84 into the upstream side movable element 40. The magnetic flux caused to flow into the upstream side movable element 40 is caused to flow into the second core 72 via an upstream side contact portion Scu1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fuel pump including a plunger that expands and contracts the volume of a pressurizing chamber.

  For example, Patent Document 1 below describes a plunger pump (fuel pump) that pressurizes fuel supplied to a fuel injection valve. In this fuel pump, the plunger, part of which is inserted into the solenoid coil, is displaced by the electromagnetic force generated by energization of the solenoid coil, thereby reducing the volume of the downstream space (pressurizing chamber) and compressing the fuel. doing.

JP 2001-221137 A

  In the case of the fuel pump described above, the gap between the solenoid coil and the plunger is likely to increase in order to allow the plunger partially inserted into the solenoid coil to be displaced along the axial direction of the solenoid coil. . For this reason, of the magnetic flux generated by energization of the solenoid coil, the magnetic flux passes through a short circuit path connecting one end of the solenoid coil and the other end outside the solenoid coil without passing through the plunger. The amount of so-called leakage magnetic flux tends to increase. Further, since the magnetic material is not necessarily arranged in the path of the magnetic flux that flows out from the inside of the solenoid coil, the magnetic resistance of the path of the magnetic flux tends to increase. And these cause the fall of the electromagnetic force which the magnetic flux of a solenoid coil exerts on a plunger.

  The present invention has been made in view of such circumstances, and an object of the present invention is to increase the electromagnetic force accompanying the energization of the coil as much as possible when the plunger that expands and reduces the volume of the pressurizing chamber is driven by the electromagnetic force. It is an object of the present invention to provide a fuel pump that can be used.

  1. A fuel pump comprising a plunger that expands and reduces the volume of the pressurizing chamber, pressurizes the fuel by reducing the volume of the pressurizing chamber by the plunger, and supplies the pressurized fuel to the fuel injection valve of the internal combustion engine A movable body that is a magnetic body that is displaced together with the plunger in either the direction of expanding or contracting the pressurizing chamber, and the movable body is accommodated while being in contact with the movable element, and A guide member extending along a displacement direction of the mover, and a force repelling the displacement when the plunger and the mover are displaced in any one direction, and the plunger and the mover are generated by the force. A repulsion member that displaces the first coil in the other direction, the first coil and the second coil, the first coil being wound, and the mover being one of the above The mover of the pair of end portions of the first coil has a magnetic flux penetrating the first coil and having a closest portion that has a minimum distance from the mover when displaced in the direction of the first coil. A first core that is a magnetic body that forms a magnetic path that guides from the first end side, which is a side end portion, to the closest portion, and the second coil, and the mover is The magnetic flux flowing into the closest portion has a closest portion where the distance from the mover is minimum when displaced in either direction, and the magnetic flux flowing into the closest portion is the one of the pair of end portions of the second coil. A second core that is a magnetic body that forms a magnetic path that guides from the first end side, which is the end on the mover side, to the second coil, and a second of the pair of end portions of the second coil. Magnetic flux flowing out from the end side to the outside of the second coil is the second of the pair of end portions of the first coil. A guide member that is a magnetic body that guides to the part side, wherein the first coil is energized so that a magnetic flux flows out from the first end part side, and the second coil is on the second end part side By energizing the magnetic flux so as to flow out, the mover is attracted toward the closest portion and displaced in either one of the directions.

  In the above configuration, the first coil is energized so that the magnetic flux flows out from the first end side, and the second coil is energized so that the magnetic flux flows out from the second end side. As a result, the magnetic flux flowing out from the first end side of the first coil flows into the mover through the closest part of the first core, and from the mover to the second coil through the closest part of the second core. Flows into the second coil from the first portion side. On the other hand, the magnetic flux flowing out from the second end side of the second coil flows into the first coil from the second end side of the first coil via the guide member. Thus, a loop path of magnetic flux generated in the first coil and the second coil by the energization is formed by the first core, the mover, the second core, and the guide member that are magnetic bodies. For this reason, compared with the case where any one of a 1st core, a needle | mover, a 2nd core, and a guide member is not a magnetic body, for example, the magnetic resistance of the path | route of magnetic flux can be made small. Therefore, in the case where the plunger for enlarging and reducing the volume of the pressurizing chamber is driven by electromagnetic force, the electromagnetic force accompanying energization of the coil can be increased as much as possible.

  2. 2. The fuel pump according to claim 1, further comprising: a first repulsive magnetic flux generating member that generates magnetic flux; and a second repulsive magnetic flux generating member that generates magnetic flux, wherein the first core flows out of the first repulsive magnetic flux generating member. A repulsive magnetic flux guide that guides the generated magnetic flux to the closest portion of the first core, and the first repulsive magnetic flux generating member is energized so that the magnetic flux flows out of the first coil from the first end side. In this case, the first surface of the first core, which is the surface facing the repulsive magnetic flux guide, has the same polarity as that of the first end of the first coil, and the second core Comprises a repulsive magnetic flux guide for guiding the magnetic flux flowing in from the closest portion of the second core to the second repulsive magnetic flux generating member, wherein the second repulsive magnetic flux generating member has the second coil as the second coil. Energized so that the magnetic flux flows out from the end side. The first surface of the second core facing the repulsive magnetic flux guide portion has the same polarity as the first end side of the second coil, and the guide member is A member that guides the magnetic flux that has flowed out of the second surface, which is the back surface of the first surface, to the second surface, which is the back surface of the first surface of the first repulsive magnetic flux generation member, among the second repulsive magnetic flux generation members. .

  In the above configuration, the magnetic flux flowing out from the first end side of the first coil and the magnetic flux flowing out from the first surface of the first repulsive magnetic flux generating member flow into the mover from the closest portion of the first core and move. The magnetic flux that has flowed from the child into the closest part of the second core flows into the second coil from the first end side, and flows into the second repulsive magnetic flux generating member from the first surface side. Further, the magnetic flux that has flowed out from the second surface of the second repulsive magnetic flux generation member flows into the second surface of the first repulsive magnetic flux generation member via the guide member. Thereby, not only the loop path of the magnetic flux of the first coil and the second coil but also the first repulsive magnetic flux generating member and the second repulsive magnetic flux are generated by the first core, the mover, the second core and the guide member which are magnetic bodies. A loop path for the magnetic flux of the member is formed.

  3. 3. The fuel pump according to 2 above, wherein the first repulsive magnetic flux generating member is a first permanent magnet in which the first surface is an N pole and the second surface is an S pole, and the second repulsive magnetic flux generating member is The second surface is a second permanent magnet in which the first surface is an S pole and the second surface is an N pole.

  In the above configuration, the first repulsive magnetic flux generating member and the second repulsive magnetic flux generating member are permanent magnets, and compared with the case where they are also used as coils, the fuel pump is operated by flowing an electric current to generate magnetic flux. It is possible to reduce the heat loss generated in the coil provided and the wiring connected to the coil.

  4). 4. The fuel pump according to claim 3, wherein the first repulsive magnetic flux generating member and the second repulsive magnetic flux generating member are in a plane orthogonal to a displacement straight line that is parallel to the displacement direction of the plunger and is a straight line that passes through the plunger. The distance between the first coil and the displacement straight line is greater than the distance between the first permanent magnet and the displacement straight line. The distance between the second coil and the displacement straight line is longer than the distance between the second permanent magnet and the displacement straight line.

  In the above configuration, since the first coil is wound around the first core, the outer diameter of the first coil is likely to be larger than that of the first core. Similarly, since the second coil is wound around the second core, the outer diameter of the second coil is likely to be larger than that of the second core. For this reason, the outer diameter of the first coil and the second coil tends to be larger than that of the first permanent magnet and the second permanent magnet. Therefore, in the above configuration, the first coil and the second coil are arranged farther from the displacement straight line than the first permanent magnet and the second permanent magnet. As a result, it is easier to secure a space because the circumferential length in the plane perpendicular to the displacement straight line is longer at the position far from the displacement straight line than at the position near the displacement straight line. And it becomes easy to ensure the space of the 2nd coil.

  5. In the fuel pump according to any one of the above 2 to 4, each of the first repulsive magnetic flux generating member and the first coil set, and the second repulsive magnetic flux generating member and the second coil set, A plurality.

  In the above configuration, a plurality of sets of the first repulsive magnetic flux generating member and the first coil and a plurality of second repulsive magnetic flux generating members and the second coil are provided. Compared with the case where only one magnetic flux generating member or the like is provided, it is easy to increase the force for attracting the mover. Also, compared to the case where only one is provided, the portion of the mover that is closest to the closest portion of the first core or the closest portion of the second core is within the plane perpendicular to the displacement direction of the plunger. Easy to be with various parts.

  6). In the fuel pump according to any one of 2 to 5, the closest portion is a contact portion that contacts the mover when the mover is displaced in any one direction, and the movable portion is movable. The portion of the child that contacts the contact portion has an outwardly convex curved surface, and the contact portion has an outwardly convex curved surface.

  In the above configuration, when the contact portion of the first core and the contact portion of the second core and the mover contact each other on the curved surface, the magnetic flux is easily orthogonal to the contact surface, and the magnetic flux is parallel to the contact surface. Compared with the case near, the electromagnetic force for displacing the mover can be increased.

  7). 6. The fuel pump according to claim 6, wherein a magnetic shield that is a non-magnetic material is disposed without a gap between the repulsive magnetic flux guide portion of the first core and the repulsive magnetic flux guide portion of the second core. The mover seals a space defined by the first core, the second core, and the magnetic shield by contacting the first core, the second core, and the magnetic shield. And the partitioned space has a shape in which a cross-sectional area in a plane perpendicular to the displacement direction of the plunger gradually increases toward the movable element, and the repulsive member is filled in the partitioned space, The fluid is compressed by the displacement of the mover in any one of the directions.

  In the said structure, while using a fluid as a repulsion member, the space defined is made into the shape where the said cross-sectional area increases gradually as it goes to a needle | mover side. Thereby, compared with the case where a cross-sectional area is constant, the amount of reduction of the volume of the partitioned space increases for the amount of displacement of the mover toward the contact portion side of the first core and the contact portion side of the second core. . For this reason, by displacing the mover toward the contact portion side of the first core and the contact portion side of the second core, the fluid located in the portion partitioned by the first core, the second core, and the mover is suitably compressed. be able to. In addition, the movable element and the first core are in contact with each other at the convex curved surface portion, and the movable element and the second core are in contact with each other at the convex curved surface portion, so that the contact area is increased. Since it is small, the pressure which a contact part and a needle | mover exert on each other becomes large. For this reason, when a needle | mover contacts the contact part of a 1st core, and the contact part of a 2nd core, it also becomes possible to improve the sealing performance of the said space defined.

  8). The fuel pump according to any one of 2 to 7, wherein the first core is assumed to be in a state in which the first coil is in a non-energized state and the magnetic flux flows out from the first repulsive magnetic flux generation member. Forming a loop path through which the magnetic flux flowing out from the first repulsive magnetic flux generating member passes through the first coil and flows into the first repulsive magnetic flux generating member, and the second core is in a non-energized state of the second coil When it is assumed that the magnetic flux flows out of the second repulsive magnetic flux generation member, the magnetic flux that flows out of the second repulsive magnetic flux generation member passes through the second coil and flows into the second repulsive magnetic flux generation member. A loop path is configured, and either one of the directions is a direction in which the plunger is displaced toward the side of expanding the pressurizing chamber, the plunger is an instep plunger, and the mover is an instep mover. The guide member is an instep guide member, the pressurization chamber is an instep pressurization chamber, the closest portion is an instep closest portion, and the repulsion member is an instep repulsion member, A second plunger that expands and contracts the volume of the second pressurizing chamber different from the first pressurizing chamber, a second movable element that moves with the second plunger in a direction in which the second pressurizing chamber expands, and the second movable A second guide member that accommodates the second movable element while being in contact with a child and extends along a displacement direction of the second movable element, and the second plunger and the second movable element are displaced in the expanding direction by the displacement. A force repelling member that generates a force that repels the force and displaces the second plunger and the second movable element in a direction in which the volume of the second pressure chamber is reduced by the force, and the second pressure is applied by the second plunger. Reduce chamber volume And the guide member is between the second end portion of the first coil of the first core and the second surface of the first repulsive magnetic flux generating member. , A portion between the second end of the second coil of the second core and the second surface of the second repulsive magnetic flux generating member, and the second movable element. The first core is displaced between the second end of the first coil and the second surface of the first repulsive magnetic flux generating member by displacing the second plunger in a direction to expand the second pressurizing chamber. And the second core is moved in a direction in which the second plunger expands the second pressurizing chamber. The second end of two coils and the second repulsive magnetic flux generating member A portion between the second surfaces of the two and having a closest portion where the distance from the second movable element is minimum, and the first coil is energized so that the magnetic flux flows out from the first end portion side. In addition, the second coil is energized so that the magnetic flux flows out from the second end side, thereby attracting the second movable element toward the closest part.

  In the above configuration, the second coil is energized so that the magnetic flux flows out from the first end side, and the second coil is energized so that the magnetic flux flows out from the second end side. The magnetic flux flowing out from the second end side of the coil flows into the second movable element through the vicinity of the second core closest part of the second core and flows from the second movable element into the vicinity of the second core closest part of the first core. It flows into one coil from the second end side. The path of the magnetic flux is also a path of the magnetic flux generated by the first coil and the second coil in order to attract the upper mover. For this reason, in the above configuration, the second movable element can be a part of the guide member.

  Moreover, in the said structure, when the 1st repulsion magnetic flux production | generation member and the 2nd repulsion magnetic flux production | generation member are a 1st permanent magnet and a 2nd permanent magnet, there exists the following effect. That is, since the first core constitutes a loop path, when no current flows through the first coil, the magnetic flux flowing out from the first surface of the first permanent magnet is transferred to the second surface via the first core. Inflow. In addition, since the second core constitutes a loop path, when no current flows through the second coil, the magnetic flux flowing out from the second surface of the second permanent magnet flows to the first surface via the second core. Inflow. Therefore, it is possible to suppress the action of attracting the mover to the closest part side of the first core and the closest part side of the second core when no current flows through the first coil and the second coil. it can.

9. 9. The fuel pump according to 8 above, further comprising an intermediate passage for guiding the fuel pressurized in the second pressurizing chamber to the upper pressurizing chamber.
In the above configuration, the fuel pressurized in the second pressurizing chamber flows into the first pressurizing chamber via the intermediate passage. For this reason, the second pressurizing chamber becomes the upstream pressurizing chamber, the former pressurizing chamber becomes the downstream pressurizing chamber, and the fuel is pressurized by both the upstream side and the downstream side.

The block diagram of the engine system provided with the fuel pump concerning one Embodiment. Sectional drawing which shows the cross-sectional structure of the fuel pump concerning the embodiment. The perspective view which shows the perspective structure of the magnet unit concerning the embodiment. The perspective view of a part of fuel pump concerning the embodiment. The top view of a part of fuel pump concerning the embodiment. Sectional drawing which shows typically the magnetic flux at the time of electricity supply of the fuel pump concerning the embodiment. The perspective view which shows typically the magnetic flux at the time of electricity supply of the fuel pump concerning the embodiment. Sectional drawing which shows typically the magnetic flux at the time of the non-energization of the fuel pump concerning the embodiment. 9-9 sectional drawing of FIG. (A) And (b) is a partial cross section figure and top view of the fuel pump concerning the modification of the said embodiment. The perspective view of a part of fuel pump concerning the modification of the said embodiment. The top view of a part of fuel pump concerning the modification of the said embodiment.

Hereinafter, an embodiment of a fuel pump will be described with reference to the drawings.
As shown in FIG. 1, a spark plug 13 and a fuel injection valve 14 for injecting fuel are exposed in the combustion chamber 12 of the internal combustion engine 10. The fuel injection valve 14 injects fuel supplied from the delivery pipe 16 into the combustion chamber 12. The fuel pump 20 is of an electronic control type, and sucks and pressurizes the fuel in the fuel tank 18 and then discharges it to the delivery pipe 16. The controller 19 operates the fuel pump 20 by outputting an operation signal to the fuel pump 20 to control the pressure of the fuel in the delivery pipe 16.

FIG. 2 shows the configuration of the fuel pump 20.
The fuel pump 20 defines an upstream pressurization chamber 36 by an upstream partition member 32 and an upstream plunger 34, and the fuel in the fuel tank 18 is upstream as the upstream pressurization chamber 36 is enlarged. It flows into the upstream pressurizing chamber 36 through the side suction valve 30. The upstream suction valve 30 is a check valve that opens when the pressure on the upstream side of the fuel tank 18 is higher than the pressure in the upstream side pressurizing chamber 36 on the downstream side by a predetermined amount or more. The upstream plunger 34 is accommodated in a cylindrical upstream guide member 38. The upstream plunger 34 is disposed coaxially with the upstream guide member 38. In FIG. 1, an axis line ax of the upstream plunger 34 and a displacement straight line exa that is parallel to the axis line ax and includes the axis line ax are described. Since the upstream plunger 34 is displaced in a direction parallel to the axis ax, when the upstream plunger 34 is displaced, the axis ax is displaced within the displacement straight line exa. A spherical upstream movable element 40 is accommodated in the upstream guide member 38 in contact with the inner peripheral surface 38 a of the upstream guide member 38. The upstream side mover 40 is a magnetic body, and in this embodiment, electromagnetic steel is exemplified. The upstream plunger 34 is elastically exerted on the upstream mover 40 side by the upstream spring 42, so that when the upstream mover 40 is displaced in a direction parallel to the displacement straight line exa, the upstream plunger 34 is also displaced while contacting the upstream side mover 40.

  The fuel pressurized in the upstream pressurizing chamber 36 by reducing the volume of the upstream pressurizing chamber 36 is discharged to the outside of the upstream pressurizing chamber 36 via the upstream discharge valve 44. The upstream discharge valve 44 is a check valve that opens when the pressure in the upstream pressurizing chamber 36 that is upstream is higher than the downstream pressure by a predetermined amount or more. The upstream discharge valve 44 is connected to the downstream suction valve 50 via the intermediate passage 46.

  In the fuel pump 20, a downstream pressurizing chamber 56 is defined by the downstream partitioning member 52 and the downstream plunger 54, and the fuel in the intermediate passage 46 flows downstream as the downstream pressurizing chamber 56 expands. It flows into the downstream pressurizing chamber 56 through the side suction valve 50. The downstream suction valve 50 is a check valve that opens when the pressure on the upstream intermediate passage 46 side is higher than the pressure in the downstream pressurizing chamber 56 on the downstream side by a predetermined amount or more. The downstream plunger 54 is accommodated inside a cylindrical downstream guide member 58. The downstream plunger 54 is disposed coaxially with the downstream guide member 58. In FIG. 1, the axis line ax of the downstream plunger 54 is shown. This is a part of the displacement straight line exa. Since the downstream plunger 54 is displaced in a direction parallel to the axis ax, when the downstream plunger 54 is displaced, the axis ax is displaced within the displacement straight line exa. A spherical downstream movable element 60 is accommodated in the downstream guide member 58 in contact with the inner peripheral surface 58 a of the downstream guide member 58. The downstream side mover 60 is a magnetic body, and in this embodiment, electromagnetic steel is exemplified. The downstream plunger 54 is elastically exerted on the downstream movable element 60 side by the downstream spring 62. When the downstream movable element 60 is displaced in a direction parallel to the displacement straight line exa, the downstream plunger is moved. 54 is also displaced while being in contact with the downstream side mover 60.

  The fuel pressurized in the downstream pressurizing chamber 56 due to the reduction in the volume of the downstream pressurizing chamber 56 is transferred to the delivery pipe 16 outside the downstream pressurizing chamber 56 via the downstream discharge valve 64. Discharged. The downstream discharge valve 64 is a check valve that opens when the pressure in the downstream pressurizing chamber 56 on the upstream side is higher than the pressure on the delivery pipe 16 side on the downstream side by a predetermined amount or more.

  A first permanent magnet 70 and a second permanent magnet 80 are provided between the upstream side mover 40 and the downstream side mover 60. In the present embodiment, the first permanent magnet 70 and the second permanent magnet 80 are neodymium magnets.

  FIG. 3 is a perspective view of the first permanent magnet 70 and the second permanent magnet 80. As shown in FIG. 3, in the present embodiment, the first permanent magnet 70 and the second permanent magnet 80 are disposed adjacent to each other in the circumferential direction Dc with respect to the displacement straight line exa, and the fuel pump 20 according to the present embodiment. Comprises three first permanent magnets 70 and three second permanent magnets 80 to constitute a magnet unit UM. The magnet unit UM has a cylindrical shape centered on the displacement straight line exa and has a hole formed in the center portion. The first permanent magnet 70 and the second permanent magnet 80 are arranged in the radial direction Dr from the center. It extends radially. In FIG. 3, the three first permanent magnets 70 are described as the first permanent magnets 70 (1), 70 (2), and 70 (3), and the three second permanent magnets 80 are the first permanent magnets 70. Two permanent magnets 80 (1), 80 (2), and 80 (3) are described. In this specification, the first permanent magnets 70 (1), 70 (2), and 70 (3) are collectively referred to as the first permanent magnet 70, and the second permanent magnets 80 (1), 80 ( 2) and 80 (3) are collectively referred to as a second permanent magnet 80.

  In the present embodiment, there are six first permanent magnets 70 (1), 70 (2), 70 (3) and second permanent magnets 80 (1), 80 (2), 80 (3). The permanent magnets have the same size and shape, and the same magnetic flux density, except for individual differences.

  Incidentally, the circumferential direction Dc is a direction that changes according to a point that defines the circumferential direction Dc. That is, the circumferential direction Dc is a tangential direction at a defined point of a circle having a distance from the displaced straight line exa to the defined point in a plane including the defined point and having the displaced straight line exa as a normal line. It is. FIG. 3 illustrates the circumferential direction Dc of the first permanent magnet 70 (1). A second permanent magnet 80 (1) and a second permanent magnet 80 (3) are adjacent to each other on both sides of the first permanent magnet 70 (1) in the circumferential direction Dc. The radial direction Dr is also a direction that changes depending on the point defining the radial direction Dr. That is, the radial direction Dr is a direction orthogonal to both the circumferential direction Dc and the displacement straight line exa at the point to be defined.

  As for the 1st permanent magnet 70, the 1st surface 70a by the side of the downstream needle | mover 60 shown in FIG. 2 is a N pole, and the 2nd surface 70b which is a back surface of the 1st surface 70a is a S pole. As for the 2nd permanent magnet 80, the 1st surface 80a by the side of the downstream needle | mover 60 shown in FIG. 2 is a south pole, and the 2nd surface 80b which is a back surface of the 1st surface 80a is a north pole.

  As shown in FIG. 2, the first surface 70a and the second surface 70b of the first permanent magnet 70 are in contact with the first core 72 constituting the loop path. The first core 72 is a magnetic body, and in this embodiment, electromagnetic steel is exemplified. The first core 72 continuously forms the magnetic path of the magnetic flux flowing out from the first surface 70 a of the first permanent magnet 70 without interruption to the second surface 70 b of the first permanent magnet 70. The first core 72 has a ring shape in cross section shown in FIG.

  As shown in FIG. 4, the fuel pump 20 according to the present embodiment includes first cores 72 (1), 72 (corresponding to the first permanent magnets 70 (1), 70 (2), 70 (3), respectively. 2) and 72 (3). Further, the fuel pump 20 according to the present embodiment includes first coils 74 (1), 74 (2), 74 (3) corresponding to the first cores 72 (1), 72 (2), 72 (3), respectively. ). That is, the first coil 74 (1) is wound around the outer periphery of the first core 72 (1), the first coil 74 (2) is wound around the outer periphery of the first core 72 (2), and the first A first coil 74 (3) is wound around the outer periphery of the core 72 (3). In this specification, when the first cores 72 (1), 72 (2), and 72 (3) are collectively referred to as the first core 72, the first coils 74 (1), 74 (2), 74 (3) is collectively referred to as the first coil 74.

  As shown in FIG. 2, the first surface 80a and the second surface 80b of the second permanent magnet 80 are in contact with the second core 82 constituting the loop path. The second core 82 is a magnetic body, and in the present embodiment, electromagnetic steel is exemplified. The second core 82 continuously forms the magnetic path of the magnetic flux flowing out from the second surface 80 b of the second permanent magnet 80 to the first surface 80 a of the second permanent magnet 80 without interruption. The second core 82 has a ring shape in cross section shown in FIG.

  As shown in FIG. 4, the fuel pump 20 according to the present embodiment includes second cores 82 (1), 82 (corresponding to the second permanent magnets 80 (1), 80 (2), 80 (3), respectively. 2) and 82 (3). Further, the fuel pump 20 according to the present embodiment includes the second coils 84 (1), 84 (2), 84 (3) corresponding to the second cores 82 (1), 82 (2), 82 (3), respectively. ). That is, the second coil 84 (1) is wound around the outer periphery of the second core 82 (1), the second coil 84 (2) is wound around the outer periphery of the second core 82 (2), and the second A second coil 84 (3) is wound around the outer periphery of the core 82 (3). In the present specification, when the second cores 82 (1), 82 (2), and 82 (3) are collectively referred to as the second core 82, the second coils 84 (1), 84 (2), 84 (3) is collectively referred to as the second coil 84.

The six coils of the first coil 74 (1), 74 (2), 74 (3) and the second coil 84 (1), 84 (2), 84 (3) have the same number of turns. Have
In FIG. 2, the first core 72 is divided into two parts, an inner part 72a on the first permanent magnet 70 side and an outer part 72b on the first coil 74 side, and the second core 82 is shown in the second permanent part. The inner part 82a on the magnet 80 side and the outer part 82b on the second coil 84 side are divided into two parts. Here, between the inner portion 72a of the first core 72 and the inner portion 82a of the second core 82, as shown in FIG. 4, the nonmagnetic property is lower than that of the first core 72 and the second core 82. A magnetic shield 90 made of a body is interposed. Specifically, in this embodiment, stainless steel is exemplified as the nonmagnetic material.

  FIG. 5 shows a plan view of the first core 72 and the second core 82 as viewed from the downstream pressurizing chamber 56 side. As shown in FIG. 5, the inner area 72 a of the first core 72, the inner part 82 a of the second core 82, and the magnetic shield 90 have a cross-sectional area in a plane orthogonal to the displacement straight line exa toward the downstream pressure chamber 56. The space to be enlarged is partitioned. As shown in FIG. 2, oil 100 is placed in this space, a space defined by the upstream guide member 38, the downstream guide member 58, the upstream movable element 40, and the downstream movable element 60. Filled.

  As shown in FIG. 2, the upstream side mover 40 and the first core 72 are in contact with each other at the upstream contact portion Scu <b> 1 in the inner portion 72 a of the first core 72. The two cores 82 are in contact with each other at the upstream contact portion Scu2 in the inner portion 82a of the second core 82. The downstream armature 60 and the first core 72 are in contact with each other at the downstream contact portion Scd1 of the inner portion 72a of the first core 72, and the downstream armature 60 and the second core 82 are Contact is made at the downstream contact portion Scd2 of the inner portion 82a of the two cores 82.

Here, the operation of the present embodiment will be described.
The control device 19 energizes the first coil 74 so that the magnetic flux flows out from the first end 74a side of the first coil 74 and flows into the second end 74b side, and the second coil 84 second. The second coil 84 is energized so that the magnetic flux flows out from the end portion 84b side and flows into the first end portion 84a side. Here, the magnitude of the current flowing through the six coils of the first coil 74 (1), 74 (2), 74 (3) and the second coil 84 (1), 84 (2), 84 (3). This is the same in this embodiment. The magnetic flux flowing out from the first end 74a of the first coil 74 by energization of the first coil 74 is a first permanent schematically shown by a magnetic force line Lmf2, as schematically shown by a magnetic force line Lmf1 in FIG. Since it repels the magnetic flux of the magnet 70, it flows into the downstream movable element 60 from the vicinity of the downstream contact portion Scd 1 of the first core 72 and then flows into the pair of adjacent second cores 82.

  FIG. 7 schematically shows a part of the magnetic flux as a magnetic force line Lmf1. As shown in FIG. 7, the magnetic flux flowing out from the first end 74a side of the first coil 74 (1) flows into the downstream side mover 60 via the first core 72 (1), and the downstream side mover. The magnetic flux that has flowed into 60 flows into the pair of second cores 82 (1) and 82 (3) adjacent to the first core 72 (1) in the circumferential direction Dc.

  Further, the magnetic flux flowing out from the second end portion 84b of the second coil 84 by energization of the second coil 84 is schematically shown by a magnetic force line Lmf4, as schematically shown by the magnetic force line Lmf3 shown in FIG. Since it repels the magnetic flux of the second permanent magnet 80, it flows into the upstream movable element 40 from the vicinity of the upstream contact portion Scu 2 of the second core 82 and then flows into the pair of adjacent first cores 72.

  As a result, the magnetic flux flowing out from the first end 74a of the first coil 74 (1) passes through the first core 72 (1), the downstream side mover 60, and the second cores 82 (1) and 82 (3). Through the second coils 84 (1) and 84 (3). The magnetic flux penetrating through the second coils 84 (1) and 84 (3) flows into the first core 72 (1) via the second cores 82 (1) and 82 (3) and the upstream mover 40. The first coil 74 (1) is penetrated from the second end 74b side of the first coil 74 (1).

  In addition, the magnetic flux flowing out from the first surface 70a of the first permanent magnet 70 flows into the downstream movable element 60 from the vicinity of the downstream contact portion Scd1 of the first core 72, and then from the vicinity of the downstream contact portion Scd2 to the second core. 82 (1) and 82 (3), and flows into the first surfaces 80a of the second permanent magnets 80 (1) and 80 (3). The magnetic flux flowing out from the second surface 80b of the second permanent magnets 80 (1), 80 (3) flows upstream through the vicinity of the upstream contact portion Scu2 of the second cores 82 (1), 82 (3). After flowing into 40, it flows into the first core 72 (1) from the vicinity of the upstream contact portion Scu1. The magnetic flux that has flowed into the first core 72 (1) flows into the second surface 70 b of the first permanent magnet 70.

  Thereby, the upstream side mover 40 and the downstream side mover 60 are magnetized by the magnetic fluxes of the first coil 74, the second coil 84, the first permanent magnet 70, and the second permanent magnet 80, and the upstream side mover 40 and the downstream side are magnetized. The side mover 60 is attracted to the first core 72 and the second core 82 side. As a result, when the upstream armature 40 is displaced toward the first core 72 and the second core 82, the upstream plunger 34 is displaced toward the first core 72 and the second core 82 due to the elastic force of the upstream spring 42. As a result, the volume of the upstream pressure chamber 36 is increased. Similarly, when the downstream armature 60 is displaced toward the first core 72 and the second core 82, the downstream plunger 54 is displaced toward the first core 72 and the second core 82 due to the elastic force of the downstream spring 62. As a result, the volume of the downstream pressure chamber 56 is increased.

  When the upstream side mover 40 and the downstream side mover 60 come into contact with the first core 72 and the second core 82, the first core 72, the second core 82, the magnetic shield 90, the upstream side mover 40, and the downstream side moveable. The oil 100 filled in the space defined by the child 60 is sealed. At this time, the closed loop path of the magnetic fluxes of the first coil 74, the second coil 84, the first permanent magnet 70, and the second permanent magnet 80 is a path composed only of a magnetic material.

  In such a state, the control device 19 stops the energization process of the first coil 74 and the second coil 84. In a state where the first coil 74 and the second coil 84 are not energized, the magnetic flux emitted from the first surface 70a of the first permanent magnet 70 passes through the first core 72 as shown by the magnetic field lines Lmf in FIG. The magnetic flux that flows into the second surface 70 b of the first permanent magnet 70 and exits from the second surface 80 b of the second permanent magnet 80 flows into the first surface 80 a of the second permanent magnet 80 via the second core 82. . For this reason, since attraction force does not act on the upstream side mover 40 and the downstream side mover 60, the first core 72, the second core 82, the magnetic shield 90, the upstream side mover 40, and the downstream side mover 60 partition. The upstream movable element 40 and the downstream movable element 60 are displaced in a direction away from each other by the repulsive force of the oil 100 compressed in the created space. As a result, the upstream plunger 34 receives a large force opposite to the force exerted on the upstream plunger 34 by the fuel in the upstream pressurizing chamber 36 and the force exerted by the upstream spring 42 on the upstream plunger 34. Then, the upstream plunger 34 is displaced so as to reduce the volume of the upstream pressure chamber 36. Similarly, a large force opposite to the force exerted on the downstream plunger 54 by the fuel in the downstream pressurizing chamber 56 and the force exerted by the downstream spring 62 is exerted on the downstream plunger 54 by the downstream mover 60. Then, the downstream plunger 54 is displaced so as to reduce the volume of the downstream pressure chamber 56.

  As described above, in the above configuration, the energization process and the energization stop process of the first coil 74 and the second coil 84 are repeated, whereby the volumes of the upstream pressurization chamber 36 and the downstream pressurization chamber 56 are repeatedly expanded and contracted. It will be.

  According to the result of simulation by the electromagnetic field analysis software, the attraction force of the upstream side mover 40 or the downstream side mover 60 according to this embodiment is “689N”. On the other hand, the attractive force when the upstream movable element 40 or the downstream movable element 60 was attracted by the magnet unit UM alone without providing the first core 72, the second core 82, and the like was “265N”. Further, the suction force when the upstream mover 40 or the downstream mover 60 is sucked using the same six coils as the first coil 74 without providing the first core 72, the second core 82, etc. is " 284N ". As described above, the upstream side mover 40 by the fuel pump 20 of the present embodiment is larger than the sum of the attractive forces of the upstream side mover 40 or the downstream side mover 60 by the six first coils 74 and the magnet unit UM. Alternatively, the suction force of the downstream side mover 60 becomes larger. This is presumed to be because, according to the fuel pump 20 of the present embodiment, the magnetic flux path is mostly made of a magnetic material, so that the magnetic resistance of the magnetic flux path is reduced.

According to the embodiment described above, the following effects can be obtained.
(1) In addition to the first coil 74 and the second coil 84, the first permanent magnet 70 and the second permanent magnet 80 are provided. Thereby, it replaces with the 1st permanent magnet 70 and the 2nd permanent magnet 80, and compared with the fuel pump which produces | generates the same amount of magnetic flux as those by the coil, the fuel pump 20 is provided by sending an electric current in order to produce | generate a magnetic flux. It is possible to reduce heat loss generated in the coil and the wiring connected to the coil.

  (2) The first permanent magnet 70 and the second permanent magnet 80 are arranged inside the radial direction Dr, and the first coil 74 and the second coil 84 are arranged outside. Since the first coil 74 is wound around the first core 72 and the second coil 84 is wound around the second core 82, its outer diameter is smaller than that of the first permanent magnet 70 and the second permanent magnet 80. Easy to grow. For this reason, disposing the first coil 74 and the second coil 84 outside the radial direction Dr has an advantage that it is easy to secure a space for the first coil 74 and the second coil 84.

  (3) The first core 72 forms a loop path through which the magnetic flux flowing out from the first permanent magnet 70 flows through the first coil 74 and flows into the first permanent magnet 70 when no current flows through the first coil 74. To do. Further, the second core 82 forms a loop path through which the magnetic flux flowing out from the second permanent magnet 80 when the current is not flowing through the second coil 84 passes through the second coil 84 and flows into the second permanent magnet 80. . As a result, when no current flows through the first coil 74 and the second coil 84, a force that attracts the upstream side movable element 40 and the downstream side movable element 60 toward the first core 72 and the second core 82 side works. Can be suppressed.

  (4) A plurality of first permanent magnets 70, second permanent magnets 80, first cores 72, and second cores 82 are provided. For this reason, it is easy to increase the force for attracting the downstream side mover 60 and the upstream side mover 40 as compared with the case where one piece is provided. Further, as schematically shown by the magnetic lines of force Lmf in FIG. 9 which is a 9-9 cross section of FIG. 2, the magnetic flux can be caused to enter the downstream side mover 60 and the upstream side mover 40 from various directions. Therefore, it is easy to suppress the electromagnetic force acting on the downstream side mover 60 and the upstream side mover 40 from being varied in the circumferential direction Dc.

  (5) The downstream contact portion Scd1 of the first core 72 and the downstream contact portion Scd2 of the second core 82 are outwardly convex curved surfaces, and the downstream mover 60 is spherical. As a result, the downstream-side movable element 60 and the first core 72 are in contact with each other at the curved surface portion that is convex outward, and the downstream-side movable element 60 and the second core 82 are in contact with each other at the curved surface portion that is convex outside. . Accordingly, the magnetic flux is easily orthogonal to the contact surface, and the electromagnetic force is also easily orthogonal to the contact surface. Therefore, compared to the case where the electromagnetic force is almost parallel to the contact surface, the downstream side mover 60 It is possible to increase the electromagnetic force that attracts the water. The same applies to the upstream side mover 40.

  (6) A space defined by the first core 72, the second core 82, the magnetic shield 90, the downstream side mover 60, and the upstream side mover 40 is filled with oil 100, and the space is filled with the downstream mover 60 side. The cross-sectional area in the plane orthogonal to the displacement straight line exa gradually increases as the distance increases, and the cross-sectional area gradually increases toward the upstream movable element 40 side. In this case, compared with a shape having a constant cross-sectional area, the volume of the space is reduced for the amount of displacement of the downstream side mover 60 and the upstream side mover 40 toward the first core 72 and the second core 82. The amount increases. For this reason, the oil 100 can be suitably compressed by the downstream mover 60 and the upstream mover 40 being displaced toward the first core 72 and the second core 82. Further, the upstream side mover 40 and the downstream side mover 60 are formed in a spherical shape, and the upstream contact portions Scu1, Scu2, the downstream contact portions Scd1, Scd2, and the corresponding portions of the magnetic shield 90 are connected to the upstream side mover 40 and the downstream side. The shape is in line contact with the mover 60. For this reason, when the downstream side mover 60 and the upstream side mover 40 come into contact with the first core 72 and the second core 82, the upstream side mover 40 and the downstream side mover 60, the first core 72, and the second core 82. In addition, since the pressure exerted on the magnetic shield 90 increases, it becomes possible to improve the sealing performance of the partitioned space.

  (7) The upstream side mover 40 and the downstream side mover 60 are provided. As a result, when the first coil 74 and the second coil 84 are energized, the magnetic flux generated by the first coil 74 and the second coil 84 and the first coil are generated by the cooperation of the upstream side mover 40 and the downstream side mover 60. The loop path of the magnetic flux of the permanent magnet 70 and the second permanent magnet 80 can be configured.

  (8) The fuel pressurized in the upstream pressurizing chamber 36 is supplied to the downstream pressurizing chamber 56 through the intermediate passage 46. In this case, the fuel can be pressurized by both the upstream pressurizing chamber 36 and the downstream pressurizing chamber 56. In addition, the portion including the upstream pressurizing chamber 36 can play a role of sucking fuel from the fuel tank 18, and as a result, fuel can be sucked from the fuel tank 18 without a separate feed pump.

  (9) The first coils 74 (1), 74 (2), 74 (3) and the second coils 84 (1), 84 (2), 84 (3) are symmetrical in a plane orthogonal to the displacement straight line exa. And arrange. Further, the first permanent magnets 70 (1), 70 (2), 70 (3) and the second permanent magnets 80 (1), 80 (2), 80 (3) are symmetric in a plane orthogonal to the displacement straight line exa. It arranges with nature. Further, the number of turns of the first coils 74 (1), 74 (2), 74 (3) and the number of turns of the second coils 84 (1), 84 (2), 84 (3) are made the same. Furthermore, the same current flows through the first coils 74 (1), 74 (2), 74 (3) and the second coils 84 (1), 84 (2), 84 (3). Thereby, the electromagnetic force acting on the upstream side mover 40 and the downstream side mover 60 can be made as uniform as possible in the circumferential direction Dc. For this reason, it can suppress that the force which the upstream needle | mover 40 and the downstream needle | mover 60 apply to the 1st core 72, the 2nd core 82, and the magnetic shield 90 becomes uneven by a place. Further, since the electromagnetic force can cause the force for displacing the upstream side mover 40 and the downstream side mover 60 to be in a direction parallel to the displacement straight line exa as much as possible, the upstream guide member 38 and the downstream guide member It can suppress that the force added to 58 becomes non-uniform according to a place.

  (10) The 1st permanent magnet 70 and the 2nd permanent magnet 80 are comprised with a neodymium magnet. Since the neodymium magnet is a magnet having a high magnetic flux density, the first permanent magnet 70 and the second permanent magnet 80 are made of, for example, magnets that do not use rare earth or are configured with coils while generating the same attractive force. Thus, the fuel pump 20 can be easily downsized.

<Correspondence>
The correspondence relationship between the items in the above embodiment and the items described in the column “Means for Solving the Problems” is as follows. In the following, the correspondence relationship is shown for each number of solution means described in the “means for solving the problem” column.

  1. The pressurizing chamber corresponds to the downstream pressurizing chamber 56, the plunger corresponds to the downstream plunger 54, the mover corresponds to the downstream mover 60, and the guide member corresponds to the downstream guide member 58. The repulsion member corresponds to the oil 100. The closest part of the first core corresponds to the downstream contact part Scd1, and the closest part of the second core corresponds to the downstream contact part Scd2. The guide member includes a portion from the second end 74 b side of the first coil 74 of the first core 72 to the second surface 70 b of the first permanent magnet 70, and the second coil 84 of the second core 82. It corresponds to the portion from the second end 84b side to the second surface 80b of the second permanent magnet 80 and the upstream side mover 40.

  2. The first repulsive magnetic flux generating member corresponds to the first permanent magnet 70, and the second repulsive magnetic flux generating member corresponds to the second permanent magnet 80. The repulsive magnetic flux guide portion of the first core corresponds to the portion of the first core 72 from the first surface 70a of the first permanent magnet 70 to the downstream contact portion Scd1, and the repulsive magnetic flux guide portion of the second core is This corresponds to the portion of the second core 82 from the first surface 80a of the second permanent magnet 80 to the downstream contact portion Scd2.

  8). The upper pressure chamber corresponds to the downstream pressure chamber 56, the upper plunger corresponds to the downstream plunger 54, the upper movable element corresponds to the downstream movable element 60, and the upper guide member corresponds to the downstream guide. Corresponds to member 58. The second pressurizing chamber corresponds to the upstream pressurizing chamber 36, the second plunger corresponds to the upstream plunger 34, the second movable member corresponds to the upstream movable member 40, and the second guide member corresponds to the upstream guide. Corresponds to member 38. Also, the repulsion member and the rebound member correspond to the oil 100. The closest portion A corresponds to the downstream contact portions Scd1, Scd2, and the closest contact portion corresponds to the upstream contact portions Scu1, Scu2.

<Other embodiments>
In addition, you may change as follows at least 1 of the matter which specified the said embodiment.

“About the shape of the mover and the closest part of the first core and the second core”
In the above embodiment, the upstream side mover 40 and the downstream side mover 60 have a spherical shape. However, the present invention is not limited to this. Good. In this case, the upstream plunger 34 contacts the flat surface of the upstream movable element 40, and the downstream plunger 54 contacts the flat surface of the downstream movable element 60.

  In the above-described embodiment, the shapes of the downstream contact portion Scd1 of the first core 72 and the downstream contact portion Scd2 of the second core 82 are curved surfaces that are convex outward and are downstream of the downstream mover 60. Although the shape of the part which contacts contact part Scd1 and Scd2 was the curved surface of convex shape on the outer side, it is not restricted to this. For example, as in the modification shown in FIG. 10, the downstream contact portion Scd <b> 1 of the first core 72 and the downstream contact portion Scd <b> 2 of the second core 82 have a flat planar shape, and the downstream contact of the downstream mover 60 is downstream. The portions that contact the portions Scd1 and Scd2 may also have a flat planar shape. In FIG. 10, members corresponding to those shown in FIG. 2 and the like are denoted by the same reference numerals for convenience. FIG. 10B shows the shapes of the first core 72 and the second core 82 viewed from the direction A in FIG. Incidentally, the broken line shown in FIG. 10B is for the modified example described in the column “Regarding the magnetic path constituted by the magnetic material” below, and is not related to the modified example described here.

  Incidentally, the modification shown in FIG. 10 is in contact with the upstream contact portions Scu1 and Scu2 of the upstream movable element 40 and the shape of the upstream contact portion Scu1 of the first core 72 and the upstream contact portion Scu2 of the second core 82. It is also an example that the shape of the portion to be performed is not an outwardly convex curved surface.

  Further, in the modified example shown in FIG. 10, the upstream movable element 40 is displaced toward the upstream pressure chamber 36 by the repulsive force generated by the compression, and the downstream movable element 60 is moved to the downstream pressure chamber. It is also an example provided with a spring 102 as a repulsive member displaced to the 56 side. FIG. 10A shows a state in which the upstream side mover 40 and the downstream side mover 60 are in contact with the first core 72 and the second core 82, and the spring 102 is in a compressed state.

  In the modification shown in FIG. 10, the magnetic flux flowing out from the first core 72 (1) is adjacent to the first core 72 (1) without passing through the downstream side mover 60. , 82 (2), a gap is provided between the first core 72 (1) and the second cores 82 (1), 82 (2). The minimum value of the distance between the first core 72 (1) and the second cores 82 (1) and 82 (2) through this gap is the first core 72 and the second core 82 and the downstream side mover 60. It is desirable that the distance is not excessively small as compared with the maximum value of the distance between and, and it is more desirable that the distance is larger than the maximum value.

"About the first repulsive magnetic flux generating member"
The first permanent magnet 70 is not limited to a neodymium magnet but may be a samarium cobalt magnet, for example. However, the magnet is not limited to a rare earth material.

  The first repulsive magnetic flux generating member is not necessarily a permanent magnet, and may be a coil, for example. In this case, the energization process of the coil constituting the first repulsive magnetic flux generating member can generate a magnetic flux having the same polarity as that of the first permanent magnet 70. For example, when oil 100 is used as the repulsion member as in the configuration illustrated in FIG. 2, the coil 100 has a configuration in which a gap through which oil 100 leaks cannot be formed by surrounding the coil with resin.

"About the second repulsive magnetic flux generating member"
The second permanent magnet 80 is not limited to a neodymium magnet but may be a samarium cobalt magnet, for example. However, the magnet is not limited to a rare earth material.

  The second repulsive magnetic flux generating member is not necessarily a permanent magnet, and may be a coil, for example. In this case, the energization process of the coil constituting the second repulsive magnetic flux generating member can generate a magnetic flux having the same polarity as that of the second permanent magnet 80. For example, when oil 100 is used as the repulsion member as in the configuration illustrated in FIG. 2, the coil 100 has a configuration in which a gap through which oil 100 leaks cannot be formed by surrounding the coil with resin.

"About Otokobuko and Oto Plunger"
A configuration in which the fuel pressurized by the upstream plunger 34 is further pressurized by the downstream plunger 54 is not essential. For example, the fuel discharged from the upstream discharge valve 44 in FIG. 2 may be supplied to the delivery pipe 16 as well as the fuel discharged from the downstream discharge valve 64 without providing the intermediate passage 46. . In this case, a feed pump that sucks the fuel in the fuel tank 18 and discharges it to the upstream side intake valve 30 and the downstream side intake valve 50 side of the fuel pump 20 may be provided. Even in the case of the above embodiment, a feed pump may be provided.

Further, it is not essential that the upstream side mover 40 and the downstream side mover 60 have the same shape.
Furthermore, the structure provided only with a single plunger may be sufficient. In addition, as a modification provided with only a single plunger, for example, there are those illustrated in FIGS. 11 and 12. Further, for example, in FIG. 2, the upstream pressurizing chamber 36, the upstream movable element 40, and the like are not provided, but instead include upstream contact portions Scu 1 and Scu 2 and partitioned by the first core 72, the second core 82 and the magnetic shield 90. 2 may be bonded to the first core 72, the second core 82, and the magnetic shield 90.

About guide members
The guide member includes a part of a loop path for allowing the magnetic flux flowing out from the first repulsive magnetic flux generating member to flow into the first repulsive magnetic flux generating member via the first coil, and the magnetic flux flowing out from the second repulsive magnetic flux generating member to the first It is not restricted to what comprises a part of loop path | route made to flow in into a 2nd repulsive magnetic flux production | generation member via 2 coils. For example, it may be as shown in FIG. In FIG. 11, members corresponding to the members shown in FIG. In the modification shown in FIG. 11, the first core 72 is branched into a pair of branch portions 72 c and 72 d on the second end 74 b side of the first coil 74, and the second core 82 is the first of the second coils 84. The second end portion 84b is branched into a pair of branch portions 82c and 82d, and the branch portion 72c of the first core 72 is coupled to the branch portion 82d of the adjacent second core 82 at the coupling portion BS. In this case, when the first coil 74 and the second coil 84 are in a non-energized state, the magnetic flux flowing out from the first surface 70 a of the first permanent magnet 70 passes through the branch portion 72 c of the first core 72. After flowing into the branch portion 82d, it flows into the first surface 80a of the second permanent magnet 80. Therefore, even in the modification shown in FIG. 11, it is possible to suppress the suction force from acting on the downstream side mover 60 when the first coil 74 and the second coil 84 are not energized.

  In the modification shown in FIG. 11, the second surfaces 70b of the first permanent magnets 70 adjacent to the magnetic fluxes of the second surfaces 80b of the second permanent magnets 80 (1), 80 (2), and 80 (3) are further provided. A guide core 110, which is a magnetic material for guiding the guide, is provided. Further, when the downstream side mover 60 comes into contact with the first core 72 and the second core 82 by closing the gap of the guide core 110 with a non-magnetic material or the like, the downstream side mover 60, the magnetic shield 90, the first The sealed space can be partitioned by the core 72 and the second core 82.

Incidentally, in the modification shown in FIG. 11, the upstream side mover 40 or the like is not provided, but “downstream side” is given to the member name for the sake of convenience in clarifying the correspondence with the above embodiment.
In addition, the modification shown in FIG. 11 may be changed, and the repulsion member may be the spring 102 as illustrated in FIG. In this case, a member for fixing the end portion of the spring 102 on the guide core 110 side to the fuel pump 20 main body side is provided.

  The modification shown in FIG. 11 may be modified so that the guide core 110 is not provided. Even in this case, the magnetic flux flowing out from the first end 74a side of the first coil 74 is the first core 72, the downstream movable element 60, the second core 82, the branching portion 82d of the second core 82, the first There is no doubt that the magnetic resistance of the path flowing into the first coil 74 from the second end 74b side via the branch portion 72c of the one core 72 is small. For this reason, even when the guide core 110 is not provided, the magnetic resistance of the path of the magnetic flux generated by energizing the first coil 74 and the second coil 84 can be minimized.

  Furthermore, as a guide member, it flows out from the 1st end part 74a side of the 1st coil 74 (1), flows in into the inside of the 2nd coil 84, and goes outside the 2nd coil 84 from the 2nd end part 84b side. The magnetic flux which flows out is not restricted to what guides to the 2nd end part 74b side of the 1st coil 74 (1). Hereinafter, this will be described based on a modification shown in FIG. In FIG. 12, the members corresponding to the members shown in FIG. Incidentally, although the broken line shown in FIG. 12 is irrelevant to the modification described here, it is described for the sake of convenience in order to show the modification described in the column “About the attracting direction of the mover by electromagnetic force” below. It is.

  In the modification shown in FIG. 12, the second core 82 has a second end 84b side of the second coil 84 on the second end 74b side of the first coil 74 of one of the pair of adjacent first cores. Are connected by a guide core 112. As shown in FIG. 2, the second end portions 84b and 74b are end portions opposite to the first end portions 84a and 74a. Further, in order to prevent magnetic flux from leaking from the first core 72 to the second core 82 adjacent to the first core 72 without passing through the downstream side mover 60, the second core adjacent to the first core 72. A gap is provided between the terminal 82 and the terminal 82. In particular, in this modification, a gap between the first core 72 (1) and the second core 82 (3) connected by the guide core 112 is not connected by the guide core 112, for example, the first core The gap is larger than the gap between the core 72 (1) and the second core 82 (1). However, the gap between the first core 72 (1) and the second core 82 (3) is the downstream contact portion Scd1 of the first core 72 (1) and the downstream contact of the second core 82 (3). Let it be a gap between the portion Scd2. Here, the downstream movable element 60 further contacts each of the downstream contact portions Scd1, Scd2 such as the first core 72 (1) and the second core 82 (3) connected by the guide core 112. A recess is provided in a portion sandwiched between the portions, and a nonmagnetic material is embedded therein. Thereby, the guide core 112 as a guide member plays the following role. That is, as schematically shown by the lines of magnetic force Lmf, the second coil 84 (1) mainly flows out from the first end 74a side of the first coil 74 (1) and penetrates the second coil 84 (1). ) To the outside from the second end portion 84b side to the second end portion 74b side of the first coil 74 (2) different from the first coil 74 (1).

  Note that the modification shown in FIG. 12 does not include the first permanent magnet 70, the second permanent magnet 80, the upstream side mover 40, and the like, and is the same as the modification shown in FIG. It is assumed that a spring 102 is provided. Here, the end of the spring 102 opposite to the downstream side mover 60 is fixed to the main body of the fuel pump 20.

  In addition, when the modification shown in FIG. 12 is partially changed, for example, in the following manner, oil 100 may be used instead of the spring 102 as the repelling member. That is, when the downstream armature 60 contacts the downstream contact portion Scd1 of the first core 72 and the downstream contact portion Scd2 of the second core 82, the downstream armature 60, the first core 72, and the second core 82 are contacted. This is a case of providing a non-magnetic material that divides a space in which the oil 100 can be sealed in cooperation with. Incidentally, in the modification shown in FIG. 12, there is no upstream member, but “downstream” is used as the member name for the sake of convenience in clarifying the correspondence with the above embodiment.

  In the modification shown in FIG. 12, the gap between the first core 72 and the second core 82 connected by the guide core 112 is changed between the first core 72 and the second core 82 not connected by the guide core 112. You may add the change which is not enlarged compared with the clearance gap between. Moreover, it is not necessary to provide a configuration in which a concave portion is provided in the downstream side movable element 60 and the nonmagnetic material is embedded.

"Repulsive magnetic flux generating member"
It is not essential to provide the first repulsive magnetic flux generating member and the second repulsive magnetic flux generating member. As a configuration not provided with this, for example, there is a modification shown in FIG. However, the present invention is not limited to this. For example, the configuration shown in FIG. 2 may be changed as follows. That is, of the inner portion 72 a of the first core 72, the first permanent magnet 70 side of the upstream contact portion Scu 1 and the downstream contact portion Scd 1, the first permanent magnet 70, and the inner portion 82 a of the second core 82. Of these, the second permanent magnet 80 side and the second permanent magnet 80 side of the upstream contact portion Scu2 and the downstream contact portion Scd2 may be replaced with a non-magnetic material.

"Attraction of the mover by electromagnetic force"
The attracting direction of the mover by electromagnetic force is not limited to the direction in which the volume of the pressurizing chamber is expanded, but may be the direction in which the volume is reduced. This can be realized, for example, by changing the above-described modification shown in FIG. 12 as follows. That is, the downstream contact portions Scd1 and Scd2 indicated by the two-dot chain line in FIG. 12 are the portions on the back side of the sheet of FIG. 12 of the first core 72 and the second core 82, and the suction direction of the downstream movable element 60 is set to The front side of the page. In FIG. 12, the downstream side mover 60 in this case is indicated by a broken line. Further, a repelling member for displacing the downstream plunger 54 and the downstream mover 60 to the back side of the drawing is a downstream spring 62 shown in FIG. Accordingly, by energizing the first coil 74 and the second coil 84, the downstream side mover 60 is displaced from the back side of the drawing in FIG. 12 so as to contact the first core 72 and the second core 82, and the downstream side. The volume of the pressurizing chamber 56 is reduced. Then, when the energization of the first coil 74 and the second coil 84 is stopped, the downstream movable element 60 is displaced to the back side in the drawing of FIG. 12 by the repulsive force of the downstream spring 62. In this case, if the downstream spring 62 is a magnetic material, it is desirable to cover the outer periphery of the downstream spring 62 with a non-magnetic material.

“Repulsive materials”
In the configuration shown in FIG. 2, a spring 102 may be provided instead of the oil 100.
The fluid constituting the repulsion member is not limited to the oil 100. For example, other liquids having appropriate compressibility may be used.

  In the configuration shown in FIG. 10, the repulsive force is applied to the upstream side movable element 40 and the downstream side movable element 60 by one spring 102, but this is not restrictive. For example, a partition is provided in the central portion of the first permanent magnet 70 and the second permanent magnet 80 in the direction of the displacement straight line exa in FIG. 10, and an upstream spring that applies a repulsive force to the upstream movable element 40 on both sides of the partition; A downstream spring that applies a repulsive force to the downstream movable element 60 may be provided.

The elastic member constituting the repulsion member is not limited to a spring, and may be, for example, solid rubber.
“Number of first and second coils”
The number of first coils and second coils is not limited to two or three, but may be one or four or more. Here, it is not essential that the number of first coils is the same as the number of second coils. For example, the coil provided in the fuel pump may be one first coil 74 (1) and two second coils 84 (1) and 84 (2). For example, in the plane shown in FIG. 5, the first core 72 (1) has a region close to 180 degrees, and each of the second cores 82 (1) and 82 (2) has a region close to 90 degrees. And can be realized by interposing a magnetic shield between the adjacent second cores 82 (1) and 82 (2). In this case, the first permanent magnet 70 (1) corresponding to the first core 72 (1) and the second permanent magnets 80 (1), 80 corresponding to the second cores 82 (1), 82 (2). (2) may be provided.

"Magnetic path composed of magnetic material"
In the above embodiment, when the downstream-side movable element 60 and the upstream-side movable element 40 are in contact with the first core 72 and the second core 82, the magnetic body constituting the magnetic path of the magnetic flux of the first coil 74 and the second coil 84. Constitutes a closed loop path, but is not limited thereto. For example, the first core 72 and the second core 82 may have a very small gap (air gap) that divides the magnetic path. Thereby, it is possible to prevent magnetic saturation from occurring in the first core 72 and the second core 82. However, for example, when the air gap is changed in the configuration shown in FIG. 2, the inner walls of the first core 72, the second core 82, and the magnetic shield 90 are covered with a nonmagnetic material so as not to touch the oil 100. Thus, the non-magnetic material prevents the oil 100 from leaking out of the air gap.

  Further, for example, the modification shown in FIG. 10 is changed so that the closest distance between the upstream side movable element 40 or the downstream side movable element 60 and the first core 72 and the second core 82 is larger than zero. You may provide the stopper 104 shown with a broken line in FIG. 10 which controls the displacement of the upstream needle | mover 40 or the downstream needle | mover 60. FIG. The stopper 104 is a nonmagnetic material. That is, of the stopper 104, the end on the downstream side mover 60 side is protruded toward the downstream side mover 60 side relative to the downstream side contact portions Scd1, Scd2, and the end portion on the upstream side mover 40 side is protruded to the upstream side contact portion. This can be realized by projecting to the upstream side mover 40 side of Scu1 and Scu2. The closest distance is preferably shorter than the distance between the first end 74a and the second end 74b of the first coil 74.

  Further, for example, in the configuration shown in FIG. 2, the oil 100 is replaced with a spring, and the magnetic shield 90 protrudes from the downstream contact portion Scd1 of the first core 72 and the downstream contact portion Scd2 of the second core 82, Even when the mover 60 is in contact with the magnetic shield 90, the first core 72 and the second core 82 may not be in contact with the downstream mover 60. In this case, the distance between the first core 72 or the second core 82 and the downstream movable element 60 when the downstream movable element 60 contacts the magnetic shield 90 is the first end 74 a of the first coil 74 and the second distance. It is desirable to make it shorter than the distance between the end portions 74b.

"About symmetry"
In the above embodiment, symmetry is provided by the following matters. (A) The first coils 74 (1), 74 (2), 74 (3) and the second coils 84 (1), 84 (2), 84 (3) are equally arranged in the circumferential direction Dc. (B) The number of turns of the first coils 74 (1), 74 (2), 74 (3) and the number of turns of the second coils 84 (1), 84 (2), 84 (3) are the same. (C) The magnitude of the current flowing through the first coils 74 (1), 74 (2), 74 (3) and the second coils 84 (1), 84 (2), 84 (3) is the same. (D) The first permanent magnets 70 (1), 70 (2), 70 (3) and the second permanent magnets 80 (2), 80 (2), 80 (3) have the same dimensions and the same shape, It shall have the same magnetic flux density.

  However, the above items are not essential. For example, even if the above item (b) is not provided, the first coils 74 (1), 74 (2), 74 (3) and the second coils 84 (1), 84 (2), 84 (3 ) And the same amount of magnetic flux generated by each of them. For example, the magnitudes of the currents flowing through the first coils 74 (1), 74 (2), 74 (3) and the second coils 84 (1), 84 (2), 84 (3) are different. This can be achieved. This compensates for the deficiency of the above item (b) regarding the symmetry of the suction force of the upstream side mover 40 and the downstream side mover 60 in the plane orthogonal to the displacement straight line exa.

  However, it is not essential that the symmetry of the suction force in the plane orthogonal to the displacement straight line exa is equivalent to that in the above embodiment. For example, the above item (a) may be simply not included.

"About the magnetic bodies that make up the first core, the second core, etc."
The material of the first core 72 is not limited to electromagnetic steel, and may be, for example, permalloy or ferrite. Furthermore, a dust core may be used. The material of the second core 82 is not limited to electromagnetic steel, but may be, for example, permalloy or ferrite. Furthermore, a dust core may be used. The material of the upstream side mover 40 is not limited to electromagnetic steel, and may be, for example, permalloy or ferrite. Furthermore, a dust core may be used. The material of the downstream side mover 60 is not limited to electromagnetic steel, and may be, for example, permalloy or ferrite. Furthermore, a dust core may be used.

"About magnetic flux seal"
The material of the magnetic shield 90 is not limited to stainless steel but may be aluminum, for example.

In the above embodiment, the thickness of the magnetic shield 90 is not limited to that illustrated in FIG. As the thickness is increased, the generation of leakage magnetic flux can be suppressed.
In the modification shown in FIG. 10, the gap is defined between the first core 72 and the second core 82. However, the present invention is not limited to this, and a magnetic shield 90 may be provided. Here, unlike the modification described in the column “Regarding Magnetic Path Consisting of Magnetic Material”, it is not essential to have a stopper function. In the modification shown in FIG. 10, when the spring 102 is made of a magnetic material, the entire circumference of the spring 102 in the direction orthogonal to the displacement straight line exa may be surrounded by a non-magnetic material. desirable.

"Other configurations"
The plunger and the mover may be integrally formed.
In the configuration shown in FIG. 2, the upstream suction valve 30 and the downstream discharge valve 64 may be provided separately from the fuel pump 20 and provided in a portion near the fuel pump 20 in the pipe connected to the fuel pump 20. Good. Similarly, in a modification having only one plunger, the intake valve and the discharge valve may be separated from the fuel pump and provided in a portion near the fuel pump 20 in the pipe connected to the fuel pump 20.

  The internal combustion engine is not limited to the one having only the fuel injection valve 14 that directly injects fuel into the combustion chamber 12, but may further include, for example, a fuel injection valve that injects fuel into the intake port. In this case, if the fuel pump 20 shown in FIG. 2 is provided, a feed pump that supplies fuel to a fuel injection valve that injects fuel into the intake port may be additionally provided. The internal combustion engine is not limited to a spark ignition type internal combustion engine. It is not essential that the displacement straight line exa includes the axis line ax. For example, when the axis line ax cannot be clearly defined because the shape of the downstream plunger 54 is extremely lacking in symmetry, it is simply parallel to the displacement direction of the downstream plunger 54. Any straight line that penetrates the downstream plunger 54 may be used.

  DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 12 ... Combustion chamber, 13 ... Spark plug, 14 ... Fuel injection valve, 16 ... Delivery pipe, 18 ... Fuel tank, 19 ... Control device, 20 ... Fuel pump, 30 ... Upstream side intake valve, 32 ... Upstream partition member, 34 ... upstream plunger, 36 ... upstream pressurizing chamber, 38 ... upstream guide member, 38a ... inner peripheral surface, 40 ... upstream movable element, 42 ... upstream spring, 44 ... upstream discharge Valve ... 46: Intermediate passage 50: Downstream suction valve 52 ... Downstream partition member 54 ... Downstream plunger 56 ... Downstream pressurization chamber 58 ... Downstream guide member 58a ... Inner peripheral surface 60 ... Downstream movable element 62 ... downstream spring, 64 ... downstream discharge valve, 70 ... first permanent magnet, 70a ... first surface, 70b ... second surface, 72 ... first core, 72a ... inner portion, 72b ... Outer part, 72c, 72d ... branching part, 7 ... 1st coil, 74a ... 1st end part, 74b ... 2nd end part, 80 ... 2nd permanent magnet, 80a ... 1st surface, 80b ... 2nd surface, 82 ... 2nd core, 82a ... Inner part, 82b ... Outer part, 82c, 82d ... Branching part, 84 ... Second coil, 84a ... First end, 84b ... Second end, 90 ... Magnetic shield, 100 ... Oil, 102 ... Spring, 110, 112 ... Guide core .

Claims (9)

A fuel pump comprising a plunger that expands and reduces the volume of the pressurizing chamber, pressurizes the fuel by reducing the volume of the pressurizing chamber by the plunger, and supplies the pressurized fuel to the fuel injection valve of the internal combustion engine In
A mover that is a magnetic body that is displaced together with the plunger in either the direction of expanding or contracting the pressurizing chamber;
A guide member that accommodates the mover and extends along a displacement direction of the mover while being in contact with the mover;
A repulsion member that generates a force repelling the displacement by displacing the plunger and the mover in the one direction, and that displaces the plunger and the mover in the other direction by the force;
A first coil and a second coil;
The first coil is wound, and has a closest portion that minimizes the distance from the mover when the mover is displaced in any one of the directions, and penetrates the first coil. A first core that is a magnetic body that forms a magnetic path that guides the magnetic flux from the first end side, which is the end portion on the mover side, of the pair of end portions of the first coil to the closest portion; ,
The second coil is wound, and has a closest portion where the distance from the mover becomes the minimum when the mover is displaced in one of the directions, and flows into the closest portion. The second core is a magnetic body that forms a magnetic path for guiding the magnetic flux to be guided from the first end side, which is the end portion on the mover side, of the pair of end portions of the second coil to the second coil. When,
The magnetic flux flowing out from the second end side of the pair of end portions of the second coil to the outside of the second coil is guided to the second end portion side of the pair of end portions of the first coil. A guide member that is a magnetic body,
When the first coil is energized so that magnetic flux flows out from the first end side and the second coil is energized so that magnetic flux flows out from the second end side, A fuel pump that sucks toward the closest portion and displaces it in one of the directions. A first repulsive magnetic flux generating member that generates magnetic flux;
A second repulsive magnetic flux generating member that generates magnetic flux,
The first core includes a repulsive magnetic flux guide that guides the magnetic flux flowing out from the first repulsive magnetic flux generation member to the closest portion of the first core,
The first repulsive magnetic flux generation member is a surface that faces the repulsive magnetic flux guide portion of the first core when the first coil is energized so that magnetic flux flows out from the first end side. The surface has the same polarity as the first end side of the first coil,
The second core includes a repulsive magnetic flux guide that guides the magnetic flux flowing from the closest portion of the second core to the second repulsive magnetic flux generation member,
The second repulsive magnetic flux generating member is a surface that faces the repulsive magnetic flux guide portion of the second core when the second coil is energized so that the magnetic flux flows out from the second end side. The surface has the same polarity as the first end portion side of the second coil,
The guide member causes the magnetic flux that has flowed out of the second surface, which is the back surface of the first surface, to the second surface, which is the back surface of the first surface, of the first repulsive magnetic flux generation member. The fuel pump according to claim 1, comprising a guiding member. The first repulsive magnetic flux generating member is a first permanent magnet in which the first surface is an N pole and the second surface is an S pole,
3. The fuel pump according to claim 2, wherein the second repulsive magnetic flux generating member is a second permanent magnet in which the first surface is an S pole and the second surface is an N pole. The first repulsive magnetic flux generating member and the second repulsive magnetic flux generating member are centered on the displacement straight line in a plane that is parallel to the displacement direction of the plunger and perpendicular to the displacement straight line that passes through the plunger. Are formed adjacent to each other along the circumferential direction,
The distance between the first coil and the displacement straight line is longer than the distance between the first permanent magnet and the displacement straight line, and the distance between the second coil and the displacement straight line is the distance between the second permanent magnet and the displacement straight line. The fuel pump according to claim 3, wherein the fuel pump is longer than a distance from the straight line.   5. The device according to claim 2, comprising a plurality of sets of the first repulsive magnetic flux generating member and the first coil and a plurality of sets of the second repulsive magnetic flux generating member and the second coil. Fuel pump. The closest portion is a contact portion that comes into contact with the mover by the displacement of the mover in any one of the directions,
Of the mover, the portion that contacts the contact portion has an outwardly convex curved surface,
The fuel pump according to any one of claims 2 to 5, wherein the contact portion has a curved surface that is convex outward. Between the repulsive magnetic flux guide portion of the first core and the repulsive magnetic flux guide portion of the second core, a magnetic shield that is a non-magnetic material is disposed without a gap,
The movable element seals a space defined by the first core, the second core, and the magnetic shield by contacting the first core, the second core, and the magnetic shield. ,
The partitioned space has a shape in which a cross-sectional area in a plane perpendicular to the displacement direction of the plunger gradually increases toward the mover,
The fuel pump according to claim 6, wherein the repulsion member is a fluid that is filled in the partitioned space and is compressed when the mover is displaced in any one of the directions. In the first core, when it is assumed that the first coil is in a non-energized state and the magnetic flux flows out from the first repulsive magnetic flux generation member, the first core causes the magnetic flux flowing out from the first repulsive magnetic flux generation member to Forming a loop path through the coil and flowing into the first repulsive magnetic flux generating member;
In the second core, when it is assumed that the second coil is in a non-energized state and the magnetic flux flows out from the second repulsive magnetic flux generation member, the magnetic flux that flows out from the second repulsive magnetic flux generation member is Forming a loop path through the coil and flowing into the second repulsive magnetic flux generating member;
One of the directions is a direction in which the plunger is displaced toward the side of expanding the pressurizing chamber,
The plunger is an instep plunger;
The mover is a former mover,
The guide member is an instep guide member,
The pressurizing chamber is an instep pressurizing chamber,
The closest portion is an instep closest portion;
The repulsion member is an instep repulsion member,
A second plunger for expanding and reducing the volume of the second pressurizing chamber different from the first pressurizing chamber;
A second movable element that is displaced together with the second plunger in a direction in which the volume of the second pressure chamber expands;
The second guide member that accommodates the second movable element while being in contact with the second movable element and extends along the displacement direction of the second movable element,
The second plunger and the second movable element are displaced in the expanding direction to generate a force repelling the displacement, and the second plunger and the second movable element are reduced in volume by the second plunger and the second movable element by the force. And a repulsive member that displaces in the direction,
Pressurizing the fuel in the second pressurizing chamber by reducing the volume of the second pressurizing chamber by the second plunger;
The guide member includes a portion between the second end of the first coil of the first core and the second surface of the first repulsive magnetic flux generating member, and the first of the second core. A portion between the second end of two coils and the second surface of the second repulsive magnetic flux generating member, and the second movable element,
The first core is a portion between the second end of the first coil and the second surface of the first repulsive magnetic flux generating member as the second plunger is displaced in a direction to expand the second pressurizing chamber. And having a closest part where the distance from the second movable element is minimum,
The second core is a portion between the second end of the second coil and the second surface of the second repulsive magnetic flux generating member by the displacement of the second plunger in a direction in which the second pressurizing chamber is expanded. And having a closest part where the distance from the second movable element is minimum,
When the first coil is energized so that the magnetic flux flows out from the first end side and the second coil is energized so that the magnetic flux flows out from the second end side, the second movable element The fuel pump according to any one of claims 2 to 7, wherein the fuel is sucked toward the closest part.   The fuel pump according to claim 8, further comprising an intermediate passage for guiding the fuel pressurized in the second pressurizing chamber to the upper pressurizing chamber.

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