Fuel supply pump and fuel supply system

Abstract

The invention provides a fuel supply pump and a fuel supply system which improve the operability of a vane pump driven by the rotation of a camshaft and improve the fuel supply performance to a high-pressure pressurizing chamber. The fuel supply pump (10) is provided with a vane pump (40) and a high-pressure pump part (20). The vane pump (40) is provided with a rotor (45) which rotates along with the rotation of a cam shaft (23). The cam shaft (23) transmits rotation of the cam shaft (23) to a rotor (45) of the vane pump (40) by means of magnetic force.

Description

Technical Field

[0001] This invention relates to a fuel supply pump and a fuel supply system. Background Technology

[0002] One type of fuel supply system for supplying fuel to an internal combustion engine is a common rail system. This system pressurizes and injects fuel via a fuel supply pump, distributing the high-pressure fuel to multiple fuel injection valves via an accumulator, also known as the common rail. The fuel supply pump is integrated with a mechanical feed pump that introduces fuel into a pressurized chamber. This mechanical feed pump is driven by the rotation of a camshaft equipped with cams, which cause a plunger that pressurizes the fuel flowing into the pressurized chamber to move back and forth.

[0003] Examples of mechanical feed pumps include subcycloidal pumps and vane pumps. In a vane pump, the vanes, supported by a rotor that rotates with the camshaft, move forward and backward by rotating while being pressed against the inner circumferential surface of a cam ring on the outer side of the centrifugal direction by centrifugal force. Fuel is drawn in and ejected by the volume change of the pressure chamber divided by adjacent vanes.

[0004] Existing technical documents Patent documents Patent document 1: Japanese Patent Application Publication No. 2017-106390. Summary of the Invention

[0005] The problem that the invention aims to solve However, for example, in low-temperature environments where the fuel viscosity is high and the camshaft rotation speed is low, the centrifugal force acting on the blades may become less than the resistance caused by the fuel viscosity, thus failing to form a pressure chamber, resulting in insufficient fuel supply to the high-pressure pressurization chamber.

[0006] The present invention was made in view of the above-mentioned problems, and provides a fuel supply pump and fuel supply system that improves the actuation of a vane pump driven by the rotation of a camshaft.

[0007] Methods used to solve problems To address the aforementioned issues, according to a certain aspect of the present invention, a fuel supply pump is provided, comprising: a pump housing; a vane pump mounted in the pump housing for pressurizing fuel; a camshaft rotatably supported by the pump housing; a plunger that moves forward and backward with the rotation of a cam provided on the camshaft; and a high-pressure pump section that pressurizes and ejects fuel supplied from the vane pump by means of the plunger; the vane pump having a rotor that rotates with the rotation of the camshaft; and the camshaft transmitting its rotation to the rotor of the vane pump by means of magnetic force.

[0008] Furthermore, in order to solve the above-mentioned problems, according to another aspect of the present invention, a fuel supply system is provided, comprising a fuel supply pump that pressurizes and ejects fuel; the fuel supply pump comprising: a pump housing; a vane pump mounted in the pump housing for pressurizing and pumping fuel; a camshaft rotatably supported by the pump housing; a plunger that moves back and forth with the rotation of a cam provided on the camshaft; and a high-pressure pump section that pressurizes and ejects fuel supplied from the vane pump by means of the plunger; the vane pump has a rotor that rotates with the rotation of the camshaft; the camshaft transmits the rotation of the camshaft to the rotor of the vane pump by means of magnetic force.

[0009] Invention Effects As explained above, according to the present invention, the actuation of the vane pump driven by the rotation of the camshaft is improved, thereby enhancing the fuel supply performance to the high-pressure pressurization chamber. Attached Figure Description

[0010] Figure 1 This is a structural diagram illustrating 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.

[0011] Figure 2 This is a cross-sectional view showing a structural example of the fuel supply pump according to this embodiment.

[0012] Figure 3 This is an exploded perspective view of the vane pump installed in the fuel supply pump of this embodiment.

[0013] Figure 4 This is a cross-sectional view showing the assembly portion of the vane pump in the fuel supply pump of this embodiment.

[0014] Figure 5 This is an explanatory diagram showing the operation of the vane pump installed in the fuel supply pump of this embodiment.

[0015] Figure 6 This is a cross-sectional view showing the assembly area of ​​the vane pump in a conventional fuel supply pump.

[0016] Figure 7 This is an explanatory diagram showing the oil storage space and fuel flow space in a conventional fuel supply pump.

[0017] Figure 8 This is an explanatory diagram showing the oil storage space and fuel flow space in the fuel supply pump of this embodiment. Detailed Implementation

[0018] The following is a reference to the appendix. Figure 1The preferred embodiments of the present invention will be described in detail below. Furthermore, in this specification and accompanying drawings, repeated descriptions are omitted by assigning the same reference numerals to constituent elements having substantially the same functional structure.

[0019] <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.

[0020] Figure 1 This section illustrates a structural example of the fuel supply system 1 for the 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.

[0021] The fuel supply system 1 includes a fuel tank 3, a fuel supply pump 10 that draws in and pressurizes fuel from the fuel tank 3, a common rail 5 that stores the fuel pressurized by the fuel supply pump 10, and a fuel injection valve (injector) 9 that injects the fuel distributed by the common rail 5 into the cylinder of an internal combustion engine (not shown).

[0022] In the intake passage 103 connecting the fuel tank 3 and the fuel supply pump 10, a filter 105 is provided to capture foreign objects mixed in with the fuel. Furthermore, in the intake passage 103, a foreign object capturing unit 4 is provided to capture metallic foreign objects mixed in with the fuel. The foreign object capturing unit 4 may include, for example, a magnetic body disposed in the space through which the fuel passes, which uses magnetic force to attract and capture metallic foreign objects such as burrs mixed in with the fuel. However, the foreign object capturing unit 4 is not particularly limited as long as it has a structure capable of capturing metallic foreign objects in the fuel. Furthermore, the foreign object capturing unit 4 may also be integrally provided with the filter 105.

[0023] The fuel supply pump 10 includes a vane pump (not shown) that draws in fuel through the intake passage 103 and pressurizes it. The fuel pressurized by the vane pump is supplied to a pressurization chamber (not shown) with the flow control unit 107 controlling the flow rate. The remaining fuel is discharged to the return passage 115 through an overflow valve (not shown) arranged parallel to the flow control unit 107, returning to the fuel tank 3. The fuel supply pump 10 is driven to rotate by the power of the internal combustion engine, pressurizing the fuel supplied to the pressurization chamber and pressing it toward the common rail 5 through the high-pressure fuel passage 109.

[0024] The common rail 5 pressurizes the fuel supplied by the fuel supply pump 10, and distributes it evenly to each fuel injection valve 9 under high pressure. The common rail 5 is equipped with a pressure sensor 113 to detect the pressure within the common rail 5 and a pressure regulating valve 111 to adjust the rail pressure. The control device 7 controls the flow rate of the high-pressure fuel supplied to the common rail 5 by controlling the drive of the flow control unit 107, and controls the drive of the pressure regulating valve 111 to adjust the rail pressure detected by the pressure sensor 113 to the desired pressure. Fuel discharged through the pressure regulating valve 111 flows back to the fuel tank 3 via the return passage 119.

[0025] High-pressure fuel from the common rail 5, distributed to each fuel injection valve 9, flows into the pressure control chamber (not shown) of the fuel injection valve 9. The high-pressure fuel flowing into the pressure control chamber forces the valve body to close the injection orifice. By discharging a portion of the high-pressure fuel from the pressure control chamber, the force on the valve body is reduced, and fuel is injected from the injection orifice into the cylinder of the internal combustion engine. The control device 7 controls the actuation of the fuel injection valve 9 based on the rail pressure and the target injection quantity. Fuel discharged from the pressure control chamber flows back to the fuel tank 3 via a return passage 117 connected to the fuel injection valve 9.

[0026] Furthermore, the structure of the fuel supply system 1 described above is merely one example, and the fuel supply system 1 is not limited to the example described above. For example, it could also be a common rail system in which the pressure regulating valve 111 is not installed in the common rail 5, and the rail pressure is controlled by controlling the injection volume of the fuel supply pump 10 by means of the flow control unit 107 located upstream of the pressurization chamber of the fuel supply pump 10.

[0027] <2. Fuel Supply Pump> Next, an example of the structure of the fuel supply pump in this embodiment will be described.

[0028] Figure 2 This is a cross-sectional view showing a structural example of the fuel supply pump 10. The fuel supply pump 10 includes a high-pressure pump section 20 and a vane pump 40. The fuel supply pump 10 draws fuel from the fuel tank 3 via the vane pump 40, pumps it into the high-pressure pump section 20, and pressurizes the fuel to a high pressure in the high-pressure pump section 20 before spraying it toward the common rail 5. A flow control unit (not shown) is provided in the fuel passage connecting the vane pump 40 and the high-pressure pump section 20 to regulate the flow rate of fuel flowing into the pressurization chamber 19.

[0029] The high-pressure pump section 20 of the fuel supply pump 10 includes a pump housing 11, a plunger cylinder 13 with a fuel intake valve 17 and a fuel injection valve 21, a camshaft 23 with a cam 27, and a tappet 31.

[0030] The pump housing 11 rotatably supports the camshaft 23. In the illustrated fuel supply pump 10, the camshaft 23 is supported on both sides via bearings 25a and 25b, respectively, through a cam 27, by means of a flange member 15 mounted on the pump housing 11 and the pump housing 11. The cam 27 is disposed within a cam chamber 37 containing lubricating oil. The flange member 15-side ends of the camshaft 23 are inserted into the interior of an internal combustion engine (not shown) and connected to the crankshaft of the internal combustion engine via gears (not shown). The opposite ends of the camshaft 23 extend toward the vane pump 40.

[0031] The pump housing 11 has a tappet sliding hole 11a extending upward from the cam chamber 37 as shown in the figure. A portion of the plunger cylinder 13 is housed in the tappet sliding hole 11a. The plunger cylinder 13 has a plunger sliding hole 13a extending on the same axis as the tappet sliding hole 11a and opening at its lower end, and a pressure chamber 19 continuously formed axially from the plunger sliding hole 13a. The plunger 35 is axially movable and retractable, and is held in the plunger sliding hole 13a. The capacity of the pressure chamber 19 varies according to the axial position of the plunger 35.

[0032] Fuel intake valve 17 opens, for example, when the pressure in pressurization chamber 19 becomes negative, to introduce low-pressure fuel pumped by vane pump 40 into pressurization chamber 19. Fuel discharge valve 21 opens when the pressure in pressurization chamber 19 becomes above a predetermined pressure, to discharge high-pressure fuel toward common rail 5.

[0033] The tappet 31 is clamped between the lower end of the plunger 35 and the cam 27. The tappet 31 is axially movable within the tappet sliding hole 11a of the pump housing 11. The tappet 31 is always forced towards 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, thereby causing the plunger 35 to move back and forth.

[0034] in addition, Figure 2 The fuel supply pump 10 shown is a pump with a set of plungers 35 and pressure chambers 19, but the number of plungers 35 and pressure chambers 19 is not particularly limited. The fuel supply pump can also be a so-called row-type pump with multiple plungers and pressure chambers arranged in parallel, or a so-called radial-type pump with multiple plungers and pressure chambers arranged on the circumference.

[0035] The operation of the fuel supply pump 10 is briefly described. If the camshaft 23 rotates along with the crankshaft of the internal combustion engine (not shown), the vane pump 40, connected to the camshaft 23, is driven. The vane pump 40 draws fuel from the fuel tank (not shown) and delivers it to the flow control unit. The flow control unit regulates the fuel flow, supplying low-pressure fuel to the fuel intake valve 17. Furthermore, if the cam 27 rotates together with the camshaft 23, the tappet 31 moves forward and backward, and the plunger 35 moves forward and backward.

[0036] For example, when the plunger 35 begins to descend from top dead center, the fuel intake valve 17 and the fuel injection valve 21 are closed. As the plunger 35 descends, the pressure in the pressurization chamber 19 decreases. If the pressure in the pressurization chamber 19 becomes negative, the fuel intake valve 17 opens, and low-pressure fuel flows into the pressurization chamber 19. When the plunger 35 reaches bottom dead center and begins to rise, the fuel intake valve 17 and the fuel injection valve 21 are closed. If the pressure in the pressurization chamber 19 rises as the plunger 35 rises, the fuel injection valve 21 opens, and high-pressure fuel is injected toward the common rail (not shown).

[0037] <3. Vane Pump> Next, the vane pump will be explained in detail.

[0038] Figure 3 and Figure 4 This is an explanatory diagram showing a structural example of a fixed-capacity vane pump 40 assembled in a pump housing 11. Figure 3 This is a perspective view showing the vane pump 40 assembled in the pump housing 11 disassembled. Figure 4 This is a cross-sectional view showing the vane pump 40 assembled in the pump housing 11.

[0039] The vane pump 40 includes a cam ring 41, a rotor 45, multiple vanes 49, a side plate 51, sealing rings 59a and 59b, and a cover 61. The multiple vanes 49 are movably accommodated in multiple slits opening on the outer circumferential surface of the rotor 45, moving radially forward and backward. 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.

[0040] The cam ring 41 has a recess 41a that receives the rotor 45, and an inner circumferential surface 43 that slides in contact with the ends of the blades 49 as the rotor 45 rotates. A side plate 51 is disposed in the cam ring 41 at the end face of the recess 41a that receives the rotor 45. Multiple pressure chambers are divided by the rotor 45, the cam ring 41, the side plate 51, and a pair of adjacent blades 49.

[0041] The cam ring 41 has an intake region where the pressure chamber expands as the rotor 45 rotates, and an exhaust region where the pressure chamber contracts as the rotor 45 rotates. That is, during one revolution of the rotor 45, the blades 49 reciprocate once, and the pressure chamber repeatedly expands and contracts. However, two or more intake and exhaust regions may be provided alternately. The intake and exhaust regions are defined by the shape of the inner circumferential surface 43 of the cam ring 41.

[0042] The side plate 51 is disposed in contact with one side of the rotor 45 and the cam ring 41. The side plate 51 has an intake hole 55 opening at a position corresponding to the intake area and an exhaust hole 53 opening at a position corresponding to the exhaust area. The rotor 45 has a rotor shaft 47. The two ends of the rotor shaft 47 are respectively provided in the recesses of the cam ring 41 and the side plate 51 and are rotatably supported. The two end faces of the rotor 45 in the axial direction are in sliding contact with the bottom surface of the recess 41a of the cam ring 41 and one end face of the side plate 51, respectively.

[0043] The cover 61 houses the cam ring 41 and side plate 51, which contain the rotor 45. The cover 61 has a fuel inlet 67 and a fuel outlet 65. The fuel inlet 67 is positioned corresponding to the intake hole 55 of the side plate 51. The fuel outlet 65 is positioned corresponding to the outlet hole 53 of the side plate 51. The cam ring 41, side plate 51, and cover 61 each have pin insertion holes and are positioned and assembled using locating pins 57.

[0044] The vane pump 40 is mounted on the pump housing 11 using bolts 63. A sealing ring 59a is disposed between the end face of the cover 61 that contacts the pump housing 11 and the mounting surface of the pump housing 11. Furthermore, a sealing ring 59b is disposed 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 sealing ring 59a primarily functions to prevent fuel and lubricating oil from leaking to the outside of the fuel supply pump 10. The sealing ring 59b primarily functions to prevent fuel and lubricating oil from mixing. Alternatively, one or both of the sealing rings 59a and 59b may be disposed on the pump housing 11 side.

[0045] Here, the camshaft 23 has a magnet retaining portion 23a at its end on the vane pump 40 side, the magnet retaining portion 23a having a facing surface that opposes the outer periphery of the cam ring 41 of the vane pump 40. Figure 3 In the example shown, the camshaft 23 has four magnet holders 23a arranged at 90-degree intervals around the shaft. Permanent magnets 48 are engaged in the opposing surfaces of the magnet holders 23a, which face the outer periphery of the cam ring 41 of the vane pump 40. The number and spacing of the permanent magnets 48 are matched to the number of vanes 49 mounted on the vane pump 40.

[0046] The illustrated magnet holding portion 23a is configured as four magnet holding portions 23a divided in the circumferential direction. However, the number of permanent magnets 48 and the number of magnet holding portions 23a may not be the same, as long as the desired number of permanent magnets 48 can be engaged in the predetermined positions. For example, the magnet holding portion 23a may also be a cylindrical magnet holding portion 23a having opposing surfaces that are continuous throughout the entire circumference.

[0047] Figure 5 This describes a situation where a permanent magnet 48, attached to the magnet holder 23a of the camshaft 23, magnetically attracts the leading end of the magnetic vane 49 of the vane pump 40. A gap is formed between the outer peripheral 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 metal, the permanent magnet 48 will not adhere to the cam ring 41 and hinder the rotation of the camshaft 23. Each permanent magnet 48 rotates around an axis around the outer peripheral surface of the cam ring 41 as the camshaft 23 rotates.

[0048] The vanes 49 mounted on the vane pump 40 are made of magnetic material and are attracted outward in the centrifugal direction by the magnetic force of the permanent magnet 48 relative to the rotation of the rotor 45. Therefore, the vanes 49 are always in contact with the inner circumferential surface 43 of the cam ring 41. Furthermore, while attracted by the magnetic force of the permanent magnet 48, the vanes 49 rotate while slidingly contacting the inner circumferential surface 43 of the cam ring 41 as the permanent magnet 48 rotates. As the camshaft 23 rotates, the rotor 45 supporting the vanes 49 rotates. That is, the camshaft 23 transmits its rotation to the rotor 45 of the vane pump 40 by means of magnetic force.

[0049] In conventional vane pumps, the vanes are pressed against the inner circumferential surface of the cam ring by the centrifugal force generated by the rotation of the rotor, which propels them outward from the slit in the centrifugal direction. Alternatively, some pumps utilize both centrifugal force and the pressure of fuel introduced into the slit in the centrifugal direction to press the vanes against the inner circumferential surface of the cam ring. In conventional vane pumps, if the internal combustion engine speed is low and the camshaft rotation speed is low, the centrifugal force acting on the vanes is small. Therefore, when the fuel viscosity is high, the centrifugal force may become less than the resistance caused by the fuel viscosity, making it difficult for the vanes to contact the inner circumferential surface of the cam ring and preventing the formation of a pressure chamber.

[0050] In contrast, the vane pump 40 of the fuel supply pump 10 of this embodiment maintains the leading edge of the vane 49 in contact with the inner circumferential surface 43 of the cam ring 41 by means of magnetic force, regardless of the viscosity of the fuel, and even when the rotational speed of the cam shaft 23 is low and the centrifugal force acting on the vane 49 is small. This reliably forms a pressure chamber divided by the cam ring 41, rotor 45, side plate 51, and adjacent vane 49. Therefore, the possibility of insufficient fuel supply to the pressurization chamber 19 of the high-pressure pump section 20 can be reduced.

[0051] Furthermore, in this embodiment, since a foreign matter collection section 4 for capturing metallic foreign matter mixed in with fuel is provided on the upstream side of the fuel supply pump 10, the possibility of metallic foreign matter intruding into the vane pump 40 and adhering to the sliding part of the vane 49, causing wear and damage to the sliding part, can be reduced.

[0052] <4. Oil storage space and fuel circulation area> Next, the oil storage space and fuel flow area in the fuel supply pump 10 of this embodiment will be described.

[0053] In the fuel supply pump 10, in the space where the cam 27 and camshaft 23 are configured, lubricating oil is stored to prevent sintering of the sliding surfaces of the camshaft 23 and bearings 25a, 25b, and the sliding surfaces of the cam 27 and tappet 31.

[0054] Figure 6 This describes a structural example of a fuel supply pump equipped with a conventional vane pump. In a conventional fuel supply pump, the end of the camshaft 141 on the vane pump 140 side protrudes outward from the pump housing 143 and is inserted into the vane pump 140, mechanically connected to the rotor 145 of the vane pump 140. In this case, a sealing ring 147 is fitted around the outer periphery of the camshaft 141 to separate the oil storage space O for storing lubricating oil within the pump housing 143 from the fuel flow space F within the vane pump 140.

[0055] Figure 7 express Figure 6 The pump housing 143 is shown with an oil storage space O and a fuel flow space F of the vane pump 140. In the case where the oil storage space O and the fuel flow space F are separated by a sliding sealing ring 147, if the pressure difference between the oil storage space O and the fuel flow space F is large, or if the sealing ring 147 does not function properly, fuel may flow into the oil storage space O through the sealing ring 147 or lubricating oil may flow into the fuel flow space F.

[0056] In contrast, the fuel supply pump 10 of this embodiment has a structure that transmits the rotation of the camshaft 23 to the rotor 45 of the vane pump 40 by means of magnetic force, so it can separate the oil storage space O of the pump housing 11 from the fuel flow space F of the vane pump 40 without the aid of a sealing ring that slides with the outer periphery of the camshaft 141.

[0057] Figure 8 express Figure 4 The image shows the oil storage space O and the fuel flow space F of the pump housing 11 at the assembly location of the vane pump 40. In the fuel supply pump 10 of this embodiment, there is no part separating the oil storage space O and the fuel flow space F by a sliding sealing ring. Furthermore, since the vane pump 40 is bolted to the pump housing 11, the cam ring 41 of the vane pump 40 is strongly pressed against the pump housing 11, and the sealing ring 59b makes the boundary between the cam ring 41 and the pump housing 11 liquid-tight. Therefore, the possibility of fuel flowing into the oil storage space O or lubricating oil flowing into the fuel flow space F can be reduced. In addition, the sealing ring 59a has the function of preventing lubricating oil or fuel from leaking out of the fuel supply pump 10.

[0058] As described above, the fuel supply pump 10 and fuel supply system 1 of this embodiment include: a pump housing 11; a vane pump 40, mounted on the pump housing 11, for pressurizing fuel; a camshaft 23, rotatably supported by the pump housing 11; a plunger 35, which moves forward and backward with the rotation of a cam 27 provided on the camshaft 23; and a high-pressure pump section 20, which pressurizes and ejects the fuel supplied from the vane pump 40 by means of the plunger 35; the vane pump 40 has a rotor 45 that rotates with the rotation of the camshaft 23; and the camshaft 23 has a structure that transmits the rotation of the camshaft 23 to the rotor 45 of the vane pump 40 by means of magnetic force.

[0059] Therefore, regardless of the fuel viscosity, and even when the rotational speed of the camshaft 23 is low and the centrifugal force acting on the blades 49 is small, the leading edge of the blades 49 is held in contact with the inner circumferential surface 43 of the cam ring 41 by magnetic force. Thus, a pressure chamber defined by the cam ring 41, rotor 45, side plate 51, and adjacent blades 49 is reliably formed. As a result, the possibility of insufficient fuel supply to the pressurization chamber 19 of the high-pressure pump section 20 is reduced.

[0060] Furthermore, in the fuel supply pump 10 of this embodiment, the vane pump 40 has a magnetic vane 49, and the camshaft 23 has a permanent magnet 48 located on the outer side of the vane 49 in the centrifugal direction. Therefore, the vane 49 can be attracted outward in the centrifugal direction, improving the reliability of keeping the outer end of the vane 49 in contact with the inner circumferential surface 43 of the cam ring 41.

[0061] Furthermore, in the fuel supply pump 10 of this embodiment, the pump housing 11 has an oil storage space O where a camshaft 23 and a cam 27 are arranged and lubricating oil is stored. The oil storage space O is separated from the fuel flow space F in the vane pump 40 where fuel flows. The camshaft 23 and the magnet 48 are not inserted into the vane pump 40 but are disposed in the oil storage space O, while the rotor 45 and the vane 49 are disposed in the fuel flow space F. Therefore, the possibility of lubricating oil flowing into the fuel flow space F can be reduced, and abnormalities in the internal combustion engine can be suppressed.

[0062] Furthermore, in the fuel supply pump 10 of this embodiment, the vane pump 40 has a cam ring 41 that houses the rotor 45 and has an inner circumferential surface 43 that slides the outer end of the vane 49 in the centrifugal direction as the rotor 45 rotates; the camshaft 23 has a magnet holding portion 23a that has a facing surface opposite to the outer circumferential surface of the cam ring 41; and a magnet 48 is provided on the facing surface of the magnet holding portion 23a. This improves the reliability of rotating the rotor 45 while simultaneously attracting the vane 49 outward in the centrifugal direction from the outside of the vane pump 40.

[0063] Furthermore, the fuel supply system 1 of this embodiment has a foreign matter collection section 4 upstream of the fuel supply pump 10 to collect metallic foreign matter mixed in with the fuel. Therefore, the possibility of metallic foreign matter intruding into the vane pump 40 and adhering to the sliding portion of the vane 49, causing wear and damage to the sliding portion, can be reduced.

[0064] The above is with reference to the appendix. Figure 1 The preferred embodiments of the present invention have been described in detail, but the present invention is not limited to such examples. It should be understood that anyone skilled in the art to which this invention pertains will be able to conceive of various modifications or alterations within the scope of the technical concept set forth in the claims, and these are of course also within the technical scope of this invention.

[0065] For example, the fuel supply pump 10 of the above embodiment has a structure that can obtain lubrication of the camshaft 23 and cam 27 by means of lubricating oil, but the present invention is not limited to fuel supply pumps with such a structure. For example, the fuel supply pump may also have a fuel-lubricated type structure that obtains lubrication of the camshaft 23 and cam 27 by circulating the fuel for injection within the pump housing. In this case, since there is no oil storage space O in the pump housing 11, the structure that separates the oil storage space O of the pump housing 11 from the fuel flow space F of the vane pump 40 may not be required. According to the present invention, even in a fuel-lubricated type fuel supply pump, regardless of the viscosity of the fuel, and even in cases where the rotational speed of the camshaft 23 is low and the centrifugal force acting on the vane 49 is small, a pressure chamber divided by the cam ring 41, rotor 45, side plate 51, and adjacent vane 49 can be reliably formed.

[0066] Explanation of reference numerals in the attached figures 1: Fuel Supply System 10: Fuel supply pump 11: Pump casing 20: High-pressure pump section 23: Camshaft 23a: Magnet holding part 27: Cam 37: Cam chamber 40: Vane pump 41: Cam Ring 43: Inner circumferential surface 45: Rotor 48: Permanent magnet 49: Leaf blade 51: Side panel 59a, 59b: Sealing rings 61: Cover F: Fuel circulation space O: Oil storage space

Claims

1. A fuel supply pump (10) comprising: Pump casing (11); A vane pump (40) is assembled in the aforementioned pump housing (11) to pressurize and deliver fuel; The camshaft (23) is rotatably supported by the aforementioned pump housing (11); The plunger (35) moves forward and backward with the rotation of the cam (27) mounted on the aforementioned camshaft (23); and The high-pressure pump section (20) pressurizes and ejects the fuel supplied from the aforementioned vane pump (40) by means of the aforementioned plunger (35); Its features are, The aforementioned vane pump (40) has a rotor (45) that rotates with the rotation of the aforementioned camshaft (23). The aforementioned camshaft (23) transmits its rotation to the aforementioned rotor (45) of the aforementioned vane pump (40) by means of magnetic force.

2. The fuel supply pump as claimed in claim 1, characterized in that, The vanes (49) of the aforementioned vane pump (40) are magnetic, and the aforementioned camshaft (23) has a magnet (48) located outside the centrifugal direction of the aforementioned vanes (49).

3. The fuel supply pump as described in claim 2, characterized in that, The aforementioned pump housing (11) has an oil storage space (O) for storing lubricating oil, which is configured with the aforementioned camshaft (23) and the aforementioned cam (27). The aforementioned oil storage space (O) is separated from the aforementioned fuel flow space (F) of the aforementioned vane pump (40); The aforementioned camshaft (23) and the aforementioned magnet (48) are not inserted into the aforementioned vane pump (40) but are located in the aforementioned oil storage space (O); The aforementioned rotor (45) and the aforementioned blades (49) are disposed within the aforementioned fuel flow space (F).

4. The fuel supply pump as claimed in claim 3, characterized in that, The aforementioned vane pump (40) has a cam ring (41) that houses the aforementioned rotor (45) and has an inner circumferential surface (41a) that slides at the outer end of the aforementioned vane (49) in the centrifugal direction as the aforementioned rotor (45) rotates. The aforementioned camshaft (23) has a magnet holding part (23a), and the aforementioned magnet holding part (23a) has a facing surface that is opposite to the outer peripheral surface of the aforementioned cam ring (41); The aforementioned magnet (48) is disposed on the aforementioned opposing surface of the aforementioned magnet holding part (23a).

5. A fuel supply system (1) comprising a fuel supply pump (10) for pressurizing and ejecting fuel, characterized in that, The aforementioned fuel supply pump (10) is equipped with: Pump casing (11); A vane pump (40) is assembled in the aforementioned pump housing (11) to pressurize and deliver fuel; The camshaft (23) is rotatably supported by the aforementioned pump housing (11); The plunger (35) moves forward and backward with the rotation of the cam (27) mounted on the aforementioned camshaft (23); and The high-pressure pump section (20) pressurizes and ejects the fuel supplied from the aforementioned vane pump (40) by means of the aforementioned plunger (35); The aforementioned vane pump (40) has a rotor (45) that rotates with the rotation of the aforementioned camshaft (23). The aforementioned camshaft (23) transmits its rotation to the aforementioned rotor (45) of the aforementioned vane pump (40) by means of magnetic force.

6. The fuel supply system as claimed in claim 5, characterized in that, Upstream of the aforementioned vane pump (40), there is a foreign matter collection section (4) for collecting metallic foreign matter mixed into the aforementioned fuel.

Images