Fuel supply pump and fuel supply system

Abstract

The operation of the vane pump, which is driven by the rotation of the camshaft, is improved, enhancing the fuel supply performance to the high-pressure pressurized chamber. [Solution] The vane pump (40) of the fuel supply pump (10), which is equipped with a vane pump (40) and a high-pressure pump section (20), has a rotor (45) that rotates in conjunction with the rotation of the camshaft (23), and the rotation of the camshaft (23) is transmitted to the rotor (45) of the vane pump (40) by magnetic force.

Description

Technical Field

[0001] The present invention relates to a fuel supply pump and a fuel supply system.

Background Art

[0002] One type of fuel supply system for supplying fuel to an internal combustion engine is a common rail system in which a fuel supply pump pressurizes and discharges fuel, and this high-pressure fuel is distributed to a plurality of fuel injection valves via a pressure accumulator also called a common rail. As a fuel supply pump, there is a pump integrated with a mechanical feed pump that introduces fuel into a pressurizing chamber for pressurizing the fuel. The mechanical feed pump is driven by the rotation of a camshaft provided with a cam that moves a plunger for pressurizing the fuel flowing into the pressurizing chamber forward and backward.

[0003] Examples of the mechanical feed pump include a trochoid pump and a vane pump. Among these, in the vane pump, vanes supported by a rotor that rotates as the camshaft rotates move forward and backward by rotating while being pressed against the inner peripheral surface of an outer cam ring in the centrifugal direction by centrifugal force, and fuel is inhaled and discharged by changing the volume of a pressure chamber partitioned by adjacent vanes.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, for example, when the viscosity of the fuel is high in a low-temperature environment and the rotational speed of the camshaft is low, the centrifugal force acting on the vanes becomes smaller than the resistance due to the viscosity of the fuel, and a pressure chamber is not formed, which may result in insufficient supply of fuel to the high-pressure pressurizing chamber.

[0006] The present invention has been made in view of the above problems, and provides a fuel supply pump and fuel supply system that improve the operability of a vane pump driven by the rotation of a camshaft. [Means for solving the problem]

[0007] To solve the above problems, according to one aspect of the present invention, a fuel supply pump is provided comprising: a pump housing; a vane pump mounted on the pump housing for pressurizing fuel delivery; a camshaft rotatably supported by the pump housing; a plunger that moves back and forth in accordance with the rotation of a cam provided on the camshaft; and a high-pressure pump section that pressurizes and discharges fuel supplied from the vane pump using the plunger, wherein the vane pump has a rotor that rotates in accordance with the rotation of the camshaft, and the camshaft transmits the rotation of the camshaft to the rotor of the vane pump by magnetic force.

[0008] Furthermore, in order to solve the above problems, according to another aspect of the present invention, a fuel supply system is provided which includes a fuel supply pump that pressurizes and discharges fuel, wherein the fuel supply pump comprises a pump housing, a vane pump mounted on the pump housing for pressurizing and delivering fuel, a camshaft rotatably supported by the pump housing, a plunger that moves back and forth in accordance with the rotation of a cam provided on the camshaft, and a high-pressure pump section that pressurizes and discharges the fuel supplied from the vane pump by the plunger, wherein the vane pump has a rotor that rotates in accordance with the rotation of the camshaft, and the camshaft transmits the rotation of the camshaft to the rotor of the vane pump by magnetic force. [Effects of the Invention]

[0009] As described above, according to the present invention, the operability of the vane pump driven by the rotation of the camshaft is improved, and the fuel supply performance to the high-pressure pressurized chamber can be enhanced. [Brief explanation of the drawing]

[0010] [Figure 1] This is a configuration diagram showing an example of a fuel supply system for an internal combustion engine equipped with a fuel supply pump according to an embodiment of the present disclosure. [Figure 2] This is a cross-sectional view showing an example of the configuration of a fuel supply pump according to this embodiment. [Figure 3] This is an exploded perspective view of the vane pump provided in the fuel supply pump according to this embodiment. [Figure 4] This is a cross-sectional view showing the mounting location of the vane pump in the fuel supply pump according to this embodiment. [Figure 5] This is an explanatory diagram showing the operation of the vane pump provided in the fuel supply pump according to this embodiment. [Figure 6] This is a cross-sectional view showing the mounting location of the vane pump in a conventional fuel supply pump. [Figure 7] This is an explanatory diagram showing the oil storage space and fuel flow space in a conventional fuel supply pump. [Figure 8] This is an explanatory diagram showing the oil storage space and fuel flow space in the fuel supply pump according to this embodiment. [Modes for carrying out the invention]

[0011] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. In this specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant explanations will be omitted.

[0012] <1. Fuel supply system> First, an example of a fuel supply system for an internal combustion engine according to an embodiment of this disclosure will be described.

[0013] Figure 1 shows an example of the configuration of the fuel supply system 1 for a diesel engine according to this embodiment. The fuel supply system 1 is constructed as a common rail system equipped with an accumulator (common rail) 5. In this embodiment, the internal combustion engine is a diesel engine, but the type of internal combustion engine is not particularly limited.

[0014] The fuel supply system 1 includes a fuel tank 3, a fuel supply pump 10 that draws fuel from the fuel tank 3, pressurizes and pumps it, a common rail 5 that stores the fuel pumped from the fuel supply pump 10, and a fuel injector 9 that injects the fuel distributed by the common rail 5 into the cylinders of an internal combustion engine (not shown).

[0015] A filter 105 for collecting foreign matter mixed in the fuel is provided in the middle of the intake passage 103 connecting the fuel tank 3 and the fuel supply pump 10. A foreign matter collection unit 4 for collecting metallic foreign matter mixed in the fuel is also provided in the middle of the intake passage 103. The foreign matter collection unit 4 includes, for example, a magnetic material placed in the space through which the fuel passes, and collects metallic foreign matter such as burrs mixed in the fuel by magnetic attraction. However, the foreign matter collection unit 4 is not particularly limited as long as it is capable of collecting metallic foreign matter in the fuel. Furthermore, the foreign matter collection unit 4 may be provided integrally with the filter 105.

[0016] The fuel supply pump 10 includes a vane pump (not shown) that draws in and pumps fuel through an intake passage 103. The fuel pumped by the vane pump is supplied to a pressurized chamber (not shown) with its flow rate controlled by a flow control unit 107. Excess fuel is discharged to a return passage 115 via an overflow valve (not shown) installed in parallel with the flow control unit 107 and returned to the fuel tank 3. The fuel supply pump 10 is rotationally driven by the power of the internal combustion engine, pressurizes the fuel supplied to the pressurized chamber, and pumps it toward the common rail 5 via a high-pressure fuel passage 109.

[0017] The common rail 5 accumulates the fuel pumped from the fuel supply pump 10, places it in a high-pressure state, and then distributes it to each fuel injection valve 9 at a uniform pressure. The common rail 5 is provided with a pressure sensor 113 for detecting the pressure within the common rail 5 and a pressure regulating valve 111 for regulating the rail pressure. The control device 7 controls the drive of the flow control unit 107 to control the flow rate of the high-pressure fuel supplied to the common rail 5, and controls the drive of the pressure regulating valve 111 so that the rail pressure detected by the pressure sensor 113 becomes the desired pressure. The fuel discharged through the pressure regulating valve 111 is refluxed to the fuel tank 3 via the return passage 119.

[0018] The high-pressure fuel distributed from the common rail 5 to each fuel injection valve 9 flows into a pressure control chamber (not shown) of the fuel injection valve 9. The high-pressure fuel that has flowed into the pressure control chamber biases the valve body in the direction of closing the injection holes. By discharging a part of the high-pressure fuel in the pressure control chamber, the biasing force of the valve body is weakened, and fuel is injected from the injection holes into the cylinder of the internal combustion engine. The control device 7 controls the drive of the fuel injection valve 9 based on the rail pressure and the target injection amount. The fuel discharged from the pressure control chamber is refluxed to the fuel tank 3 via the return passage 117 connected to the fuel injection valve 9.

[0019] Note that the configuration of the fuel supply system 1 described above is merely an example, and the fuel supply system 1 is not limited to the above example. For example, a common rail system may be used in which the pressure regulating valve 111 is not provided in the common rail 5, and the rail pressure is controlled by controlling the discharge amount of the fuel supply pump 10 by the flow control unit 107 provided on the upstream side of the pressurizing chamber of the fuel supply pump 10.

[0020] <2. Fuel Supply Pump> Subsequently, a configuration example of the fuel supply pump according to the present embodiment will be described.

[0021] Figure 2 is a cross-sectional view showing one example configuration of the fuel supply pump 10. The fuel supply pump 10 comprises a high-pressure pump section 20 and a vane pump 40. The fuel supply pump 10 draws fuel from the fuel tank 3 using the vane pump 40, pumps it to the high-pressure pump section 20, and pressurizes the fuel to a high pressure in the high-pressure pump section 20 before discharging it toward the common rail 5. A flow control unit (not shown) for adjusting the fuel flow rate into the pressurizing chamber 19 is provided in the middle of the fuel passage connecting the vane pump 40 and the high-pressure pump section 20.

[0022] The high-pressure pump section 20 of the fuel supply pump 10 comprises a pump housing 11, a plunger barrel 13 to which a fuel intake valve 17 and a fuel discharge valve 21 are assembled, a camshaft 23 on which a cam 27 is provided, and a tappet 31.

[0023] The pump housing 11 rotatably supports the camshaft 23. In the illustrated fuel supply pump 10, the camshaft 23 is supported on both sides of the cam 27 via bearings 25a and 25b, respectively, by a flange member 15 mounted on the pump housing 11 and the pump housing 11. The cam 27 is located in a cam chamber 37 where lubricating oil is stored. The end of the camshaft 23 on the flange member 15 side is inserted into the interior of an internal combustion engine (not shown) and connected to the crankshaft of the internal combustion engine via a gear (not shown). The other end of the camshaft 23 extends toward the vane pump 40 side.

[0024] The pump housing 11 has a tappet sliding hole 11a extending upward from the cam chamber 37 as shown in the figure. Part of the plunger barrel 13 is housed in the tappet sliding hole 11a. The plunger barrel 13 has a plunger sliding hole 13a extending along the same axis as the tappet sliding hole 11a with an open lower end, and a pressurizing chamber 19 formed axially continuous from the plunger sliding hole 13a. The plunger 35 is held in the plunger sliding hole 13a so as to be able to move back and forth in the axial direction. The volume of the pressurizing chamber 19 changes depending on the axial position of the plunger 35.

[0025] The fuel intake valve 17 opens, for example, when the pressure in the pressurizing chamber 19 becomes negative, and introduces low-pressure fuel pumped from the vane pump 40 into the pressurizing chamber 19. The fuel discharge valve 21 opens when the pressure in the pressurizing chamber 19 exceeds a predetermined pressure, and discharges high-pressure fuel toward the common rail 5.

[0026] The tappet 31 is interposed between the lower end of the plunger 35 and the cam 27. The tappet 31 is provided so as to be able to move axially back and forth within the tappet sliding hole 11a of the pump housing 11. The tappet 31 is constantly biased toward the cam 27 by the tappet spring 33. As the cam 27 rotates, the tappet 31 moves back and forth within the tappet sliding hole 11a, converting the rotational motion of the cam 27 into linear motion and causing the plunger 35 to move back and forth.

[0027] The fuel supply pump 10 shown in Figure 2 is a pump having a set of plungers 35 and pressurizing chambers 19, but the number of plungers 35 and pressurizing chambers 19 is not particularly limited. The fuel supply pump may be a so-called in-line type pump in which multiple plungers and pressurizing chambers are arranged in parallel, or a so-called radial type pump in which multiple plungers and pressurizing chambers are arranged around a circumference.

[0028] The operation of the fuel supply pump 10 will be briefly explained. As the crankshaft of the internal combustion engine (not shown) rotates, the camshaft 23 rotates, and the vane pump 40 connected to the camshaft 23 is driven. The vane pump 40 draws fuel from a fuel tank (not shown) and sends it to a flow control unit. The flow control unit adjusts the fuel flow rate to supply low-pressure fuel to the fuel intake valve 17. Also, as the cam 27 rotates together with the camshaft 23, the tappet 31 moves back and forth, and the plunger 35 moves back and forth.

[0029] For example, when the plunger 35 begins to lift down from top dead center, the fuel intake valve 17 and the fuel discharge valve 21 are closed. As the plunger 35 lifts down, the pressure in the pressurizing chamber 19 decreases and becomes negative, causing the fuel intake valve 17 to open and low-pressure fuel to flow into the pressurizing chamber 19. When the plunger 35 begins to lift after reaching bottom dead center, the fuel intake valve 17 and the fuel discharge valve 21 are closed. As the plunger 35 lifts and the pressure in the pressurizing chamber 19 increases, the fuel discharge valve 21 opens and high-pressure fuel is discharged toward a common rail (not shown).

[0030] <3. Vane pump> Next, I will explain vane pumps in detail.

[0031] Figures 3 and 4 are explanatory diagrams showing an example configuration of a fixed-displacement vane pump 40 mounted on a pump housing 11. Figure 3 is a perspective view showing the vane pump 40 mounted on the pump housing 11 in an exploded view. Figure 4 is a cross-sectional view of the vane pump 40 mounted on the pump housing 11.

[0032] The vane pump 40 comprises a cam ring 41, a rotor 45, a plurality of vanes 49, a side plate 51, seal rings 59a, 59b, and a cover 61. The plurality of vanes 49 are housed in a plurality of slits opening on the outer circumferential surface of the rotor 45 so as to be able to move back and forth radially around the rotor 45. The vanes 49 are made of a magnetic material. In the illustrated example, the rotor 45 holds four vanes 49 arranged at 90-degree intervals around its axis, but the number of vanes 49 is not particularly limited.

[0033] The cam ring 41 has a recess 41a for accommodating the rotor 45, and an inner circumferential surface 43 on which the ends of the vanes 49 slide against as the rotor 45 rotates. The side plate 51 is positioned on the end face of the cam ring 41 where the recess 41a accommodating the rotor 45 opens. Multiple pressure chambers are partitioned by the rotor 45, the cam ring 41, the side plate 51, and a pair of adjacent vanes 49.

[0034] The cam ring 41 has a suction region where the volume of the pressure chamber expands as the rotor 45 rotates, and a discharge region where the volume of the pressure chamber contracts as the rotor 45 rotates. In other words, while the rotor 45 rotates once, the vane 49 makes one reciprocating motion, and the pressurized chamber repeatedly expands and contracts. However, two or more suction and discharge regions may be provided alternately. The suction and discharge regions are defined by the shape of the inner circumferential surface 43 of the cam ring 41.

[0035] The side plate 51 is provided in contact with one side surface of the rotor 45 and the cam ring 41. The side plate 51 has an intake hole 55 that opens at a position corresponding to the suction area and a discharge hole 53 that opens at a position corresponding to the discharge area. The rotor 45 has a rotor shaft 47. Both ends of the rotor shaft 47 are rotatably supported in recesses provided in the cam ring 41 and the side plate 51, respectively. The axial end faces of the rotor 45 slide against the bottom surface of the recess 41a of the cam ring 41 and one end surface of the side plate 51, respectively.

[0036] The cover 61 houses the cam ring 41, which contains the rotor 45, and the side plate 51. The cover 61 has a fuel intake port 67 and a fuel discharge port 65. The fuel intake port 67 is located at a position corresponding to the intake hole 55 of the side plate 51. The fuel discharge port 65 is located at a position corresponding to the discharge hole 53 of the side plate 51. The cam ring 41, the side plate 51, and the cover 61 each have pin insertion holes and are positioned and assembled using positioning pins 57.

[0037] The vane pump 40 is attached to the pump housing 11 using bolts 63. A seal ring 59a is positioned between the end face of the cover 61 that contacts the pump housing 11 and the mounting surface of the pump housing 11. A seal ring 59b is positioned between the end face of the cam ring 41 that contacts the pump housing 11 and the mounting surface of the pump housing 11. The seal ring 59a primarily serves to prevent fuel and lubricating oil from leaking out of the fuel supply pump 10. The seal ring 59b primarily serves to prevent fuel and lubricating oil from mixing with each other. Note that one or both of the seal rings 59a and 59b may be provided on the pump housing 11 side.

[0038] Here, the camshaft 23 has a magnet holder portion 23a at the end facing the vane pump 40, which has an opposing surface that faces the outer circumferential surface of the cam ring 41 of the vane pump 40. In the example shown in Figure 3, the camshaft 23 has four magnet holder portions 23a arranged at 90-degree intervals around its axis. Permanent magnets 48 are attached to each of the opposing surfaces of the magnet holder portions 23a that face the outer circumferential surface of the cam ring 41 of the vane pump 40. The number and spacing of the permanent magnets 48 are arranged to match the number of vanes 49 provided in the vane pump 40.

[0039] The illustrated magnet holder 23a is configured as four magnet holders 23a divided in the circumferential direction, but the number of permanent magnets 48 and the number of magnet holders 23a do not have to match, as long as a desired number of permanent magnets 48 can be joined at predetermined positions. For example, the magnet holder 23a may be a single cylindrical magnet holder 23a having opposing surfaces that are continuous around the entire circumference in the circumferential direction.

[0040] Figure 5 shows how a permanent magnet 48, joined to the magnet holder 23a of the camshaft 23, magnetically attracts the tip of the magnetic vane 49 of the vane pump 40. A gap is formed between the outer circumferential surface of the cam ring 41 of the vane pump 40 and the permanent magnet 48. Therefore, even if the cam ring 41 is made of a metal material, the permanent magnet 48 will not be attracted to the cam ring 41 and obstruct the rotation of the camshaft 23. Each permanent magnet 48 rotates around the outer circumferential surface of the cam ring 41 as the camshaft 23 rotates.

[0041] The vanes 49 on the vane pump 40 are made of a magnetic material and are attracted outward in the centrifugal direction relative to the rotation of the rotor 45 by the magnetic force of the permanent magnet 48. Therefore, the vanes 49 are in constant contact with the inner circumferential surface 43 of the cam ring 41. Furthermore, while being attracted by the magnetic force of the permanent magnet 48, the vanes 49 rotate while sliding against the inner circumferential surface 43 of the cam ring 41 as the permanent magnet 48 rotates. The rotor 45 that supports the vanes 49 rotates as the camshaft 23 rotates. In other words, the camshaft 23 transmits its rotation to the rotor 45 of the vane pump 40 by magnetic force.

[0042] In conventional vane pumps, the vanes are subjected to a force that causes them to protrude outward from the slits due to the centrifugal force generated by the rotor's rotation, pressing them against the inner surface of the cam ring. In some configurations, the vanes are also pressed against the inner surface of the cam ring by the pressure of the fuel introduced into the slits on the centrifugal side of the vanes, in addition to the centrifugal force. In conventional vane pumps, if the rotational speed of the internal combustion engine is low and the rotational speed of the camshaft is low, the centrifugal force acting on the vanes becomes small. In such cases, if the fuel viscosity is high, the centrifugal force may become smaller than the resistance due to the fuel viscosity, making it difficult for the vanes to contact the inner surface of the cam ring, and potentially preventing the formation of a pressure chamber.

[0043] In contrast, the vane pump 40 of the fuel supply pump 10 according to this embodiment maintains that the tip of the vane 49 is in contact with the inner circumferential surface 43 of the cam ring 41 by magnetic force, regardless of the viscosity of the fuel, and even when the rotational speed of the camshaft 23 is low and the centrifugal force acting on the vane 49 is small. This ensures that a pressure chamber partitioned by the cam ring 41, rotor 45, side plate 51, and adjacent vanes 49 is reliably formed. Therefore, the risk of insufficient fuel supply to the pressurized chamber 19 of the high-pressure pump section 20 can be reduced.

[0044] Furthermore, in this embodiment, a foreign matter collection unit 4 is provided upstream of the fuel supply pump 10 to collect metallic foreign matter mixed in the fuel. This reduces the risk of metallic foreign matter entering the vane pump 40 and adhering to the sliding parts of the vanes 49, which could cause wear or damage to the sliding parts.

[0045] <4. Oil storage space and fuel flow area> Next, the oil storage space and fuel flow area in the fuel supply pump 10 according to this embodiment will be described.

[0046] In the fuel supply pump 10, lubricating oil is stored in the space where the cam 27 and camshaft 23 are located to prevent seizing of the sliding surfaces between the camshaft 23 and bearings 25a and 25b, and between the cam 27 and tappet 31.

[0047] Figure 6 shows an example of the configuration of a conventional fuel supply pump equipped with a vane pump. In a conventional fuel supply pump, the end of the camshaft 141 on the vane pump 140 side protrudes out of the pump housing 143 and is inserted into the vane pump 140, and is mechanically connected to the rotor 145 of the vane pump 140. In this case, a seal ring 147 is fitted around the outer circumference of the camshaft 141 for the purpose of separating the oil storage space O in the pump housing 143 where lubricating oil is stored from the fuel flow space F in the vane pump 140.

[0048] Figure 7 shows the oil reservoir space O of the pump housing 143 and the fuel flow space F of the vane pump 140, as shown in Figure 6. In a configuration where the oil reservoir space O and the fuel flow space F are separated by a sliding seal ring 147, if the seal ring 147 does not function properly, such as when there is a large difference between the pressure in the oil reservoir space O and the pressure in the fuel flow space F, there is a risk that fuel may flow into the oil reservoir space O or lubricating oil may flow into the fuel flow space F via the seal ring 147.

[0049] In contrast, the fuel supply pump 10 according to this embodiment has a configuration that transmits the rotation of the camshaft 23 to the rotor 45 of the vane pump 40 by magnetic force, so that the oil storage space O of the pump housing 11 and the fuel flow space F of the vane pump 40 can be separated without a seal ring that slides against the outer circumference of the camshaft 141.

[0050] Figure 8 shows the oil storage space O of the pump housing 11 and the fuel flow space F of the vane pump 40 at the mounting location of the vane pump 40 shown in Figure 4. In the fuel supply pump 10 according to this embodiment, there is no area separated between the oil storage space O and the fuel flow space F by a sliding seal ring. Furthermore, since the vane pump 40 is pressed and fixed to the pump housing 11 by bolts, the cam ring 41 of the vane pump 40 is strongly pressed against the pump housing 11, and the boundary between the cam ring 41 and the pump housing 11 is made liquid-tight by the seal ring 59b. This reduces the risk of fuel flowing into the oil storage space O or lubricating oil flowing into the fuel flow space F. The seal ring 59a has the function of preventing lubricating oil or fuel from leaking outside the fuel supply pump 10.

[0051] As described above, the fuel supply pump 10 and fuel supply system 1 according to this embodiment include a pump housing 11, a vane pump 40 mounted on the pump housing 11 for pressurizing and pumping fuel, a camshaft 23 rotatably supported by the pump housing 11, a plunger 35 that moves back and forth in accordance with the rotation of a cam 27 provided on the camshaft 23, and a high-pressure pump section 20 that pressurizes and discharges the fuel supplied from the vane pump 40 by the plunger 35. The vane pump 40 has a rotor 45 that rotates in accordance with the rotation of the camshaft 23, and the camshaft 23 is configured to transmit the rotation of the camshaft 23 to the rotor 45 of the vane pump 40 by magnetic force.

[0052] As a result, regardless of the viscosity of the fuel, and even when the rotational speed of the camshaft 23 is low and the centrifugal force acting on the vanes 49 is small, the magnetic force holds the tips of the vanes 49 in contact with the inner circumferential surface 43 of the cam ring 41. Therefore, a pressure chamber partitioned by the cam ring 41, rotor 45, side plate 51, and adjacent vanes 49 is reliably formed. Consequently, the risk of insufficient fuel supply to the pressurized chamber 19 of the high-pressure pump unit 20 can be reduced.

[0053] Furthermore, in the fuel supply pump 10 according to this embodiment, the vanes 49 of the vane pump 40 are magnetic, and the camshaft 23 has a permanent magnet 48 located on the centrifugal outer side of the vanes 49. Therefore, it is possible to increase the certainty of attracting the vanes 49 outward in the centrifugal direction and holding the centrifugal outer end of the vanes 49 in contact with the inner circumferential surface 43 of the cam ring 41.

[0054] Furthermore, in the fuel supply pump 10 according to this embodiment, the pump housing 11 has an oil storage space O in which the camshaft 23 and cam 27 are arranged and lubricating oil is stored. The oil storage space O and the fuel flow space F through which fuel flows in the vane pump 40 are separated. The camshaft 23 and magnet 48 are provided in the oil storage space O without being inserted into the vane pump 40, and the rotor 45 and vanes 49 are provided in the fuel flow space F. Therefore, the risk of lubricating oil flowing into the fuel flow space F can be reduced, and malfunctions of the internal combustion engine can be suppressed.

[0055] Furthermore, in the fuel supply pump 10 according to this embodiment, the vane pump 40 has a cam ring 41 that houses the rotor 45 and has an inner circumferential surface 43 on which the centrifugal outer ends of the vanes 49 slide as the rotor 45 rotates, the camshaft 23 has a magnet holding portion 23a that faces the outer circumferential surface of the cam ring 41, and the magnet 48 is provided on the surface facing the magnet holding portion 23a. This makes it possible to increase the reliability of rotating the rotor 45 while attracting the vanes 49 outward in the centrifugal direction from the outside of the vane pump 40.

[0056] Furthermore, the fuel supply system 1 according to this embodiment is equipped with a foreign matter collection unit 4 upstream of the fuel supply pump 10 to collect metallic foreign matter mixed in with the fuel. This reduces the risk of metallic foreign matter entering the vane pump 40 and adhering to the sliding parts of the vanes 49, which could cause wear or damage to the sliding parts.

[0057] Although preferred embodiments of the present invention have been described in detail above with reference to the attached drawings, the present invention is not limited to such examples. It is clear to any person with ordinary skill in the art to which the present invention belongs that various modifications or alterations can be conceived within the scope of the technical idea described in the claims, and these are also understood to fall within the technical scope of the present invention.

[0058] For example, the fuel supply pump 10 according to the above embodiment had a configuration in which lubrication of the camshaft 23 and cam 27 etc. was obtained by lubricating oil, but the present invention is not limited to a fuel supply pump with such a configuration. For example, the fuel supply pump may have a fuel-lubricated configuration in which fuel for injection is circulated within the pump housing to obtain lubrication of the camshaft 23 and cam 27 etc. In this case, since there is no oil storage space O in the pump housing 11, it is not necessary to have a configuration that separates the oil storage space O of the pump housing 11 from the fuel flow space F of the vane pump 40. According to the present invention, even with a fuel-lubricated fuel supply pump, a pressure chamber partitioned by the cam ring 41, rotor 45, side plate 51 and adjacent vanes 49 can be reliably formed regardless of the viscosity of the fuel, and even when the rotational speed of the camshaft 23 is low and the centrifugal force acting on the vanes 49 is small. [Explanation of Symbols]

[0059] 1: Fuel supply system 10: Fuel supply pump 11: Pump Housing 20: High-pressure pump section 23: Camshaft 23a: Magnet holding part 27: Cam 37: Cam chamber 40: Vane pump 41: Camring 43: Inner surface 45: Rotor 48: Permanent magnet 49: Bane 51: Side Plate 59a·59b: Seal ring 61: Cover F:Fuel distribution space O: Oil storage space

Claims

1. Pump housing (11) and A vane pump (40) is mounted on the pump housing (11) to pump fuel under pressure, A camshaft (23) is rotatably supported in the pump housing (11), A plunger (35) moves back and forth in accordance with the rotation of the cam (27) provided on the camshaft (23), A high-pressure pump section (20) pressurizes and discharges the fuel supplied from the vane pump (40) using the plunger (35), A fuel supply pump (10) equipped with, The vane pump (40) has a rotor (45) that rotates in conjunction with the rotation of the camshaft (23), The camshaft (23) transmits its rotation to the rotor (45) of the vane pump (40) by magnetic force. A fuel supply pump characterized by the following features.

2. The vanes (49) of the vane pump (40) are magnetic, and the camshaft (23) has a magnet (48) located on the centrifugal outer side of the vanes (49). The fuel supply pump according to feature 1.

3. The pump housing (11) has an oil reservoir space (O) in which the camshaft (23) and the cam (27) are arranged and lubricating oil is stored. The oil storage space (O) and the fuel flow space (F) through which the fuel flows in the vane pump (40) are separated. The camshaft (23) and the magnet (48) are provided in the oil reservoir space (O) without being inserted into the vane pump (40). The rotor (45) and the vane (49) are provided within the fuel flow space (F). The fuel supply pump according to feature 2.

4. The vane pump (40) has a cam ring (41) that houses the rotor (45) and has an inner circumferential surface (41a) on which the centrifugal outer end of the vane (49) slides as the rotor (45) rotates. The camshaft (23) has a magnet holding portion (23a) that has an opposing surface facing the outer circumferential surface of the cam ring (41), The magnet (48) is provided on the opposing surface of the magnet holding portion (23a), The fuel supply pump according to feature 3.

5. A fuel supply system (1) comprising a fuel supply pump (10) that pressurizes and discharges fuel, The fuel supply pump (10) is Pump housing (11) and A vane pump (40) is mounted on the pump housing (11) to pump fuel under pressure, A camshaft (23) is rotatably supported in the pump housing (11), A plunger (35) moves back and forth in accordance with the rotation of the cam (27) provided on the camshaft (23), A high-pressure pump section (20) pressurizes and discharges the fuel supplied from the vane pump (40) using the plunger (35), Equipped with, The vane pump (40) has a rotor (45) that rotates in conjunction with the rotation of the camshaft (23), The camshaft (23) transmits its rotation to the rotor (45) of the vane pump (40) by magnetic force. A fuel supply system characterized by the following features.

6. Upstream of the vane pump (40), a foreign matter collection unit (4) is provided for collecting metallic foreign matter mixed in the fuel. The fuel supply system according to claim 5, characterized in that it is the same as described in claim 5.

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