High-pressure pump

Abstract

The first magnetic yoke (641) is capable of forming a magnetic circuit (Mc1) on the pressurized chamber side relative to the coil (60) in the axial direction of the coil (60) by energizing the coil (60). The second magnetic yoke (645) is capable of forming a magnetic circuit (Mc1) on the opposite side of the pressurized chamber relative to the coil (60) in the axial direction of the coil (60) by energizing the coil (60). The first connecting portion (661) connects the coil assembly (502) to the fixed core (57) on the opposite side of the coil assembly (502) from the pressurized chamber. The second connecting portion (671) connects the coil assembly (502) to the cylindrical component (51) on the pressurized chamber side of the coil assembly (502).

Description

[0001] Cross-references between related applications

[0002] This application is based on Japanese Patent Application No. 2020-113263 filed on June 30, 2020 and Japanese Patent Application No. 2021-036089 filed on March 8, 2021, the contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a high-pressure pump. Background Art

[0004] Conventionally, there is known a high-pressure pump that pressurizes fuel and supplies it to an internal combustion engine.

[0005] For example, the high-pressure pump disclosed in Patent Document 1 includes a coil assembly including a coil to open and close an intake valve that regulates fuel drawn into a pressurizing chamber.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2013-144973 Summary of the Invention

[0009] In the high-pressure pump of Patent Document 1, the coil assembly's yoke and fixed core are welded to the side of the coil assembly opposite the pressurized chamber. On the pressurized chamber side of the coil assembly, a gap is formed between the inner circumferential wall of the coil assembly's yoke and the outer circumferential wall of the barrel member, at least partially along the circumference. In other words, the coil assembly is mounted relative to the barrel member using a clearance fit.

[0010] Furthermore, the high-pressure pump of Patent Document 1 includes a coil assembly with terminals for energizing the coil. When the high-pressure pump is mounted on an internal combustion engine, the portion of the coil assembly that is loosely fitted on the pressurized chamber side is particularly likely to vibrate due to vibrations from the internal combustion engine and the high-pressure pump during operation.

[0011] If the coil assembly vibrates, the terminals may vibrate and wear, resulting in poor conduction. This can cause malfunction of the suction valve and poor discharge from the high-pressure pump.

[0012] An object of the present disclosure is to provide a high-pressure pump capable of suppressing discharge defects.

[0013] The high-pressure pump according to the present disclosure includes a pressurizing chamber forming portion, a suction passage forming portion, a seat member, a valve member, a cylinder member, a valve needle, a movable core, a fixed core, a coil assembly, a first connecting portion, and a second connecting portion.

[0014] The pressure chamber forming portion forms a pressure chamber for pressurizing fuel. The intake passage forming portion forms an intake passage through which the fuel sucked into the pressure chamber flows. The seat member is provided in the intake passage and has a communication passage connecting one surface with the other surface.

[0015] The valve member is provided on the pressurized chamber side of the seat member and can allow or restrict the flow of fuel in the communication path by moving away from the seat member to open the valve or contacting the seat member to close the valve.

[0016] The valve needle is arranged to be reciprocatingly movable in the axial direction inside the cylindrical member, with one end of the valve needle interlocking with the valve member. The movable core is arranged at the other end of the valve needle. The fixed core is arranged to face the movable core in the axial direction of the valve needle.

[0017] The coil assembly includes a coil subassembly, a first yoke, and a second yoke. The coil subassembly includes a connector, terminals provided on the connector, a cylindrical coil connected to the terminals, and a resin portion covering the terminals and the coil.

[0018] The first yoke forms a magnetic circuit on the pressurized chamber side of the coil in the axial direction of the coil by energizing the coil. The second yoke forms a magnetic circuit on the opposite side of the coil in the axial direction of the coil by energizing the coil.

[0019] The first connection portion connects the coil assembly to the fixed core on the side of the coil assembly opposite to the pressurized chamber. The second connection portion connects the coil assembly to the cylindrical member on the pressurized chamber side of the coil assembly.

[0020] In the present disclosure, the coil assembly is supported by the fixed core via the first connection portion on the side opposite to the pressurized chamber, and supported by the cylindrical member via the second connection portion on the pressurized chamber side. That is, both ends of the coil assembly in the axial direction are supported by other locations.

[0021] Therefore, when the high-pressure pump is installed in an internal combustion engine, vibrations in the coil assembly caused by the engine's vibrations and the high-pressure pump's operating vibrations can be suppressed. This reduces vibration and wear of the terminals, thus preventing poor conduction. Consequently, malfunctions in the intake valve and poor discharge from the high-pressure pump can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Regarding the above-mentioned and other objects, features and advantages of the present disclosure, Figure 1 This will become clearer from the detailed description below.

[0023] Figure 1 It is a cross-sectional view showing the high-pressure pump according to the first embodiment.

[0024] Figure 2It is a cross-sectional view showing the coil assembly of the high-pressure pump according to the first embodiment.

[0025] Figure 3 It is a cross-sectional view showing the solenoid assembly of the high-pressure pump according to the first embodiment.

[0026] Figure 4 This is a cross-sectional view showing a portion of the electromagnetic drive unit of the high-pressure pump according to the first embodiment.

[0027] Figure 5 This is a cross-sectional view showing the second connection portion and its vicinity of the high-pressure pump according to the first embodiment.

[0028] Figure 6 This is a cross-sectional view showing a portion of a second connecting portion of a high-pressure pump according to a second embodiment and its vicinity.

[0029] Figure 7 It is a cross-sectional view showing a second connection portion and its vicinity of a high-pressure pump according to a third embodiment.

[0030] Figure 8 It is a cross-sectional view showing a second connection portion and its vicinity of a high-pressure pump according to a fourth embodiment.

[0031] Figure 9 It is a cross-sectional view showing a second connection portion and its vicinity of a high-pressure pump according to a fifth embodiment.

[0032] Figure 10 It is a cross-sectional view showing a second connection portion and its vicinity of a high-pressure pump according to a sixth embodiment.

[0033] Figure 11 It is a cross-sectional view showing a portion of an electromagnetic drive unit of a high-pressure pump according to a seventh embodiment.

[0034] Figure 12 It is a cross-sectional view showing a portion of an electromagnetic drive unit of a high-pressure pump according to an eighth embodiment.

[0035] Figure 13 It is a cross-sectional view showing a portion of an electromagnetic drive unit of a high-pressure pump according to a ninth embodiment.

[0036] Figure 14 It is a cross-sectional view showing a portion of an electromagnetic drive unit of a high-pressure pump according to a tenth embodiment.

[0037] Figure 15 It is a cross-sectional view showing a portion of an electromagnetic drive unit of a high-pressure pump according to an eleventh embodiment.

[0038] Figure 16 It is a cross-sectional view showing a portion of an electromagnetic drive unit of a high-pressure pump according to a twelfth embodiment.

[0039] Figure 17It is a cross-sectional view showing a portion of a high-pressure pump according to a thirteenth embodiment.

[0040] Figure 18 It is a cross-sectional view showing a high-pressure pump of a comparative embodiment.

[0041] Figure 19 It is a cross-sectional view showing a portion of a high-pressure pump according to a fourteenth embodiment. DETAILED DESCRIPTION

[0042] Hereinafter, a high-pressure pump according to a plurality of embodiments will be described with reference to the accompanying drawings. In addition, substantially the same components in the plurality of embodiments are given the same reference numerals, and their description will be omitted.

[0043] (First embodiment)

[0044] exist Figure 1 1 shows a high-pressure pump according to a first embodiment.

[0045] The high-pressure pump 10 of this embodiment is applied to a fuel supply system having a fuel injection valve that supplies fuel to an internal combustion engine (hereinafter referred to as "engine") 1 of a vehicle (not shown). The high-pressure pump 10 is mounted on an engine head 2 of the engine 1, for example.

[0046] A fuel tank mounted on a vehicle stores gasoline or other fuel. A fuel pump pumps up the fuel in the fuel tank and discharges it. A fuel supply pipe connects the fuel pump to the high-pressure pump 10. Thus, the fuel pumped up and discharged by the fuel pump flows into the high-pressure pump 10 through the fuel supply pipe.

[0047] A fuel rail is provided in engine 1 along with a high-pressure pump 10. Engine 1 is, for example, a four-cylinder gasoline engine. The fuel rail is provided in engine head 2 of engine 1. Fuel injection valves are provided so that their injection holes are exposed within the combustion chamber of engine 1. For example, four fuel injection valves are provided to match the number of cylinders in engine 1. Four fuel injection valves are connected to the fuel rail.

[0048] High-pressure pump 10 and the fuel rail are connected by high-pressure fuel piping 8. Fuel flowing from the fuel supply piping into high-pressure pump 10 is pressurized by pump 10 and supplied to the fuel rail via high-pressure fuel piping 8. This maintains the fuel pressure within the fuel rail at a relatively high level. The fuel injection valve opens and closes in response to commands from an ECU (not shown), acting as a control device, to inject the fuel within the fuel rail into the combustion chamber of engine 1. This fuel injection valve is a so-called direct injection (DI) fuel injection valve.

[0049] A sensor is installed on the fuel supply line, on the fuel tank side relative to the high-pressure pump 10. This sensor detects the fuel pressure (fuel pressure) and temperature (combustion temperature) within the fuel supply line and transmits corresponding signals to the ECU. Based on the fuel pressure and temperature detected by the sensor, the ECU determines the target pressure for fuel discharged from the fuel pump and controls the operation of the fuel pump motor to discharge fuel at the target pressure.

[0050] like Figure 1 As shown, the high-pressure pump 10 includes an upper housing 21 , a lower housing 22 , a cylinder 23 , a holder support 24 , a cover 26 , a plunger 11 , a suction valve 300 , an electromagnetic drive 500 , a discharge passage 700 , and the like.

[0051] The upper housing 21, the lower housing 22, the cylinder 23, and the holder support portion 24 are formed of metal such as stainless steel. Here, the upper housing 21 and the lower housing 22 correspond to the "housing".

[0052] The upper case 21 is formed in a substantially octagonal column shape, for example, and has an octagonal cylindrical outer peripheral wall.

[0053] The upper case 21 has a hole 211, a suction hole 212, and a discharge hole 214. The hole 211 is formed to pass through the center of the upper case 21 along the axis of the upper case 21 in a cylindrical shape.

[0054] The suction hole portion 212 is formed to extend from the outer peripheral wall of the upper shell 21 toward the hole portion 211 and is connected to the hole portion 211. A suction passage 216 is formed inside the suction hole portion 212 of the upper shell 21. Here, the upper shell 21 corresponds to the "suction passage forming portion."

[0055] The discharge hole 214 is formed so as to extend from the side of the housing outer peripheral wall of the upper housing 21 opposite to the suction hole 212 toward the hole 211 and connect to the hole 211. A discharge passage 217 is formed inside the discharge hole 214. Here, the discharge hole 214 of the upper housing 21 corresponds to the "discharge passage forming portion."

[0056] The lower case 22 is formed in a substantially disk shape and has a hole 221 .

[0057] The hole portion 221 is formed to penetrate the center of the lower case 22 in the plate thickness direction in a substantially cylindrical shape.

[0058] The lower case 22 is provided integrally with the upper case 21 so as to be fitted into (engaged with) a recessed portion formed below the upper case 21 .

[0059] When the high-pressure pump 10 is mounted on the engine 1 , the lower housing 22 is fixed to the engine head 2 of the engine 1 by bolts (not shown).

[0060] The cylinder 23 has a cylinder hole 231. The cylinder hole 231 is formed into a substantially cylindrical shape so as to extend from one end surface of the cylindrical member toward the other end surface. In other words, the cylinder 23 is formed into a bottomed cylindrical shape having a cylindrical portion and a bottom portion that closes one end of the cylindrical portion.

[0061] The outer diameter of the cylinder 23 is slightly larger than the inner diameter of the hole 211 of the upper shell 21. The cylinder 23 is integrally provided with the upper shell 21 and the lower shell 22 in such a manner that the outer peripheral wall on the bottom side is matched (fitted) with the hole 211 of the upper shell 21. The cylinder 23 has a suction hole 232 and a discharge hole 233. The suction hole 232 is formed so as to connect the end portion on the bottom side of the cylinder hole 231 to the suction hole 212 of the upper shell 21. The discharge hole 233 is formed so as to connect the end portion on the bottom side of the cylinder hole 231 to the discharge hole 214 of the upper shell 21.

[0062] The retainer support portion 24 is formed in a substantially cylindrical shape. The retainer support portion 24 is provided integrally with the lower housing 22 in such a manner that one end thereof is fitted (engaged) with a recess formed below the lower housing 22. When the high-pressure pump 10 is mounted on the engine 1, the retainer support portion 24 is inserted into the mounting hole portion 3 formed in the engine cylinder head 2 (see FIG. Figure 1 ).

[0063] The plunger 11 is formed into a roughly cylindrical shape by a metal such as stainless steel. The plunger 11 has a large diameter portion 111 and a small diameter portion 112. The outer diameter of the small diameter portion 112 is smaller than the outer diameter of the large diameter portion 111. The plunger 11 is configured so that the large diameter portion 111 side thereof is inserted into the cylinder hole portion 231 of the cylinder 23. A pressurized chamber 200 is formed between the bottom wall and the inner peripheral wall of the cylinder hole portion 231 and the end portion of the large diameter portion 111 side of the plunger 11. That is, the cylinder 23 forms the pressurized chamber 200. Here, the cylinder 23 corresponds to the "pressurized chamber forming portion". The pressurized chamber 200 is connected to the suction hole 232 and the discharge hole 233.

[0064] The outer diameter of the plunger 11 is slightly smaller than the inner diameter of the cylinder 23, that is, the inner diameter of the cylinder bore 231. Therefore, the plunger 11 can slide the outer peripheral wall of its large-diameter portion 111 relative to the inner peripheral wall of the cylinder bore 231 and reciprocate axially within the cylinder bore 231. As the plunger 11 reciprocates within the cylinder bore 231, the volume of the pressurized chamber 200 increases or decreases. Thus, the plunger 11 is configured to reciprocate axially within the cylinder bore 231, with one end positioned within the pressurized chamber 200.

[0065] In this embodiment, a seal holder 14 is provided inside the holder support portion 24. The seal holder 14 is formed into a cylindrical shape from a metal such as stainless steel. The seal holder 14 is provided so that its outer wall fits (engages) with the inner wall of the holder support portion 24.

[0066] A variable volume chamber 201 whose volume changes during the reciprocating movement of the plunger 11 is formed between the step surface between the large diameter portion 111 and the small diameter portion 112 of the plunger 11 and the seal holding seat 14 .

[0067] Here, an annular space 202 is formed between the lower housing 22, the outer peripheral wall of the cylinder 23, the inner peripheral wall of the retainer support 24, and the seal retaining seat 14. The annular space 202 is connected to a hole (not shown) that penetrates the lower housing 22 in the plate thickness direction. Furthermore, the annular space 202 is connected to the variable volume chamber 201.

[0068] A generally disk-shaped spring seat 12 is provided at the end of the small-diameter portion 112 of the plunger 11 on the opposite side from the large-diameter portion 111. A spring 13 is provided between the seal retaining seat 14 and the spring seat 12. The spring 13 is, for example, a coil spring, and is configured so that one end abuts the spring seat 12 and the other end abuts the seal retaining seat 14 via a gasket. The spring 13 applies force to the plunger 11 toward the side opposite to the pressurized chamber 200 via the spring seat 12. When the high-pressure pump 10 is mounted on the engine cylinder head 2 of the engine 1, a push rod (lifter 5) is mounted on the end of the small-diameter portion 112 of the plunger 11 on the opposite side from the large-diameter portion 111.

[0069] When the high-pressure pump 10 is installed in the engine 1, the push rod 5 abuts against the cam 4 of the camshaft, which rotates in conjunction with the engine 1's drive shaft. As the engine 1 rotates, the rotation of the cam 4 causes the plunger 11 to reciprocate in the axial direction. At this point, the volumes of the pressurized chamber 200 and the variable volume chamber 201 each change periodically.

[0070] The cover 26 is formed of metal such as stainless steel, for example. The cover 26 includes a cover tube portion 261 and a cover bottom portion 262. The cover tube portion 261 is formed in a substantially octagonal cylindrical shape and has an octagonal cylindrical outer peripheral wall.

[0071] The cover bottom 262 is integrally formed with the cover tube portion 261 so as to block one end of the cover tube portion 261. That is, the cover 26 is formed into a bottomed cylindrical shape. Furthermore, in this embodiment, the cover 26 is formed, for example, by press working a plate-like member. Therefore, the wall thickness of the cover 26 is relatively small. Furthermore, since the cover 26 does not form a high-pressure chamber, the wall thickness can be reduced.

[0072] Cover 26 has a cover hole portion 266 and a cover hole portion 267. Cover hole portions 266 and 267 are each formed in a substantially cylindrical shape, connecting the inner peripheral wall and the outer peripheral wall of cover tube portion 261, i.e., the cover outer peripheral wall. Cover hole portions 266 and 267 are formed substantially coaxially so as to face each other with the axis of cover tube portion 261 interposed therebetween.

[0073] The cover 26 is configured to accommodate the upper shell 21 on the inside, and the end of the cover tube portion 261 on the opposite side of the cover bottom 262 abuts against the surface of the lower shell 22 on the upper shell 21 side. The cover 26 forms a fuel chamber 260 between the upper shell 21, the lower shell 22, and the cylinder 23. Here, the end of the cover tube portion 261 and the lower shell 22 are joined across the entire circumferential area, for example, by welding. As a result, the cover tube portion 261 and the lower shell 22 are maintained liquid-tight. In addition, the cover 26 is configured in such a manner that the cover hole portion 266 corresponds to the suction hole portion 212 of the upper shell 21, and the cover hole portion 267 corresponds to the discharge hole portion 214 of the upper shell 21.

[0074] In this manner, the cover 26 covers at least a portion of the cylinder 23 , the upper casing 21 , and the lower casing 22 , and forms a fuel chamber 260 between the cover 26 and the cylinder 23 , the upper casing 21 , and the lower casing 22 .

[0075] A supply passage (not shown) is provided in the cover 26. The supply passage is formed into a cylindrical shape, with the inner space communicating with the fuel chamber 260. A fuel supply pipe is connected to the supply passage. Thus, fuel discharged from the fuel pump flows into the fuel chamber 260 via the fuel supply pipe and the supply passage.

[0076] The suction valve portion 300 is provided inside the suction hole portion 212 of the upper housing 21, that is, in the suction passage 216. The suction valve portion 300 includes a seat member 31, a stopper 35, a valve member 40, a spring 39, and the like.

[0077] The seat member 31 is formed into a substantially disk shape from a metal such as stainless steel and is provided in the suction passage 216 inside the suction hole 212 . The outer peripheral wall of the seat member 31 is press-fitted into the inner peripheral wall of the suction hole 212 .

[0078] The seat member 31 includes a communication passage 32 and a valve seat 310. The communication passage 32 is formed in a substantially cylindrical shape and connects one surface of the seat member 31 to the other surface at the center thereof.

[0079] The valve seat 310 is formed in an annular shape around the communication passage 32 on the surface of the seat member 31 on the pressurizing chamber 200 side.

[0080] The stopper 35 is formed of metal such as stainless steel, for example, and is provided on the pressurizing chamber 200 side relative to the seat member 31 in the suction passage 216 .

[0081] A portion of the suction passage 216 is formed in the communication passage 32 of the seat member 31 . Therefore, the fuel in the fuel chamber 260 can flow into the pressurizing chamber 200 via the suction passage 216 formed in the communication passage 32 and the suction hole 232 .

[0082] The valve member 40 is provided on the pressurizing chamber 200 side of the seat member 31. The valve member 40 is provided between the seat member 31 and the stopper 35 so as to be reciprocatingly movable in the axial direction of the seat member 31.

[0083] The valve member 40 has a surface on the seat member 31 side that can abut against the valve seat 310 , which is the surface of the seat member 31 on the pressurized chamber 200 side, and a surface on the stopper 35 side that can abut against the surface of the stopper 35 on the seat member 31 side.

[0084] When the surface of the valve component 40 on the side of the seat component 31 moves away from the surface on the side of the pressurized chamber 200 of the seat component 31, that is, the valve seat 310, the valve is opened to allow the flow of fuel in the connecting passage 32; when the surface of the valve component 40 on the side of the seat component 31 abuts against the valve seat 310, the valve is closed to limit the flow of fuel in the connecting passage 32.

[0085] When the valve member 40 is opened, the flow of fuel in the communication passage 32 is permitted, and the fuel on the fuel chamber 260 side can flow to the pressurized chamber 200 side via the communication passage 32 and the suction hole 232. Furthermore, the fuel on the pressurized chamber 200 side can flow to the fuel chamber 260 side via the suction hole 232 and the communication passage 32. At this time, the fuel flows around the valve member 40.

[0086] When the valve member 40 is closed, the flow of fuel in the communication passage 32 is restricted, and the fuel on the fuel chamber 260 side is restricted from flowing to the pressurized chamber 200 side via the communication passage 32 and the suction hole 232. Furthermore, the fuel on the pressurized chamber 200 side is restricted from flowing to the fuel chamber 260 side via the suction hole 232 and the communication passage 32.

[0087] The spring 39 is, for example, a coil spring, and is provided between the stopper 35 and the valve member 40. One end of the spring 39 contacts the surface of the stopper 35 on the seat member 31 side, and the other end contacts the surface of the valve member 40 on the pressurizing chamber 200 side. The spring 39 urges the valve member 40 toward the seat member 31 side.

[0088] The electromagnetic drive unit 500 is provided so as to protrude radially outward from the cover outer peripheral wall from the suction hole 212 of the upper housing 21 through the cover hole 266 of the cover 26 .

[0089] The electromagnetic drive unit 500 is composed of a first electromagnetic drive unit 501 (see Figure 3 ) and the second electromagnetic drive unit 502 as a "coil assembly" (refer to Figure 2)constitute.

[0090] like Figure 3 As shown, the first electromagnetic drive unit 501 as a "solenoid assembly" includes a cylinder member 51, a guide member 52, a valve needle 53, a spring 54 as a biasing member, a movable core 55, a magnetic throttle portion 56, a fixed core 57, etc.

[0091] The tubular member 51 includes a first tubular portion 511, a second tubular portion 512, and a third tubular portion 513. The first tubular portion 511, the second tubular portion 512, and the third tubular portion 513 are formed of, for example, a magnetic material. The first tubular portion 511 is formed in a substantially cylindrical shape.

[0092] The second cylindrical portion 512 is formed in a cylindrical shape. The second cylindrical portion 512 is substantially coaxial with the first cylindrical portion 511 and is integrally formed in such a manner that its end portion is connected to the end portion of the first cylindrical portion 511. The maximum outer diameter of the second cylindrical portion 512 is smaller than the outer diameter of the end portion of the first cylindrical portion 511 on the second cylindrical portion 512 side.

[0093] The third cylindrical portion 513 is formed in a substantially cylindrical shape. The third cylindrical portion 513 is formed substantially coaxially and integrally with the second cylindrical portion 512, with its end portion connected to the end portion of the second cylindrical portion 512 on the opposite side from the first cylindrical portion 511. The outer diameter of the third cylindrical portion 513 is smaller than the maximum outer diameter of the second cylindrical portion 512.

[0094] A screw thread is formed on the outer peripheral wall of the end portion of the first cylindrical portion 511 opposite the second cylindrical portion 512. A screw thread groove corresponding to the screw thread of the first cylindrical portion 511 is formed on the inner peripheral wall of the end portion of the suction hole portion 212 of the upper shell 21 opposite the pressurized chamber 200.

[0095] The cylindrical member 51 is configured so that the threads of the first cylindrical portion 511 are threadedly engaged with the thread grooves of the upper housing 21. Here, the end surface of the first cylindrical portion 511 of the cylindrical member 51 on the pressurized chamber 200 side biases the seat member 31 and the stopper 35 toward the pressurized chamber 200. As a result, the seat member 31 and the stopper 35 abut against each other, restricting axial movement.

[0096] The first cylindrical portion 511 of the cylindrical member 51 is located inside the cover hole portion 266 of the cover 26. Therefore, the end of the first cylindrical portion 511 on the pressurized chamber 200 side is located inside the cover cylindrical portion 261, while the end of the first cylindrical portion 511 on the opposite side from the pressurized chamber 200, the second cylindrical portion 512, and the third cylindrical portion 513 are located outside the cover cylindrical portion 261. Furthermore, the cylindrical member 51 is disposed so that its axis is orthogonal to the axis Ax1 of the cylinder 23.

[0097] The inner diameter of the portion of the cylindrical member 51 on the pressurized chamber 200 side is larger than the inner diameter of the portion on the opposite side from the pressurized chamber 200. A substantially annular stepped surface 514 is formed on the inner side of the cylindrical member 51, facing the pressurized chamber 200. To ensure sufficient wall thickness, the stepped surface 514 is located slightly closer to the pressurized chamber 200 side relative to the connection between the first cylindrical portion 511 and the second cylindrical portion 512 in the axial direction of the cylindrical member 51.

[0098] The first cylindrical portion 511 is formed with a hole 515 that connects the inner circumferential wall with the outer circumferential wall. Multiple holes 515 are formed at equal intervals around the circumference of the first cylindrical portion 511. The holes 515 are formed in the axial direction of the first cylindrical portion 511, spanning the cover hole 266 and the fuel chamber 260. Therefore, fuel in the fuel chamber 260 can flow into the inside of the first cylindrical portion 511 through the holes 515 and flow toward the pressurized chamber 200 through the intake passage 216.

[0099] A welding ring 519 is provided on the outside of the cover 26, radially outward of the first cylindrical portion 511 of the cylindrical member 51. The welding ring 519 is formed, for example, from metal into a substantially cylindrical shape. The welding ring 519 is formed so that the end portion on the pressurized chamber 200 side expands radially outward, and abuts against the periphery of the cover hole portion 266 of the cover outer peripheral wall. The end portion of the welding ring 519 on the pressurized chamber 200 side is welded to the cover outer peripheral wall over the entire circumferential range, and the portion of the welding ring 519 on the side opposite to the pressurized chamber 200 is welded to the outer peripheral wall of the first cylindrical portion 511 over the entire circumferential range. More specifically, at the end portion of the welding ring 519 on the pressurized chamber 200 side, the welding ring 519 is connected to the cover 26 over the entire circumferential range via a weld portion 591 formed by melting the welding ring 519 and the cover 26 during welding and then cooling and solidifying. Furthermore, at the weld ring 519, the weld ring 519 and the tubular member 51 are connected over the entire circumferential extent by a weld portion 592 formed by melting the weld ring 519 and the tubular member 51 during welding and then cooling and solidifying. This prevents the fuel in the fuel chamber 260 from leaking outside the cover 26 through the gap between the cover hole 266 and the outer peripheral wall of the first tubular portion 511. Furthermore, the load from high pressure is borne by the threads of the tubular member 51, preventing stress from acting on the weld ring 519.

[0100] The guide member 52 is disposed inside the first cylindrical portion 511. The guide member 52 is formed into a generally cylindrical shape, for example, from metal. The guide member 52 is fixed inside the first cylindrical portion 511 such that its outer peripheral wall fits (engages) with the inner peripheral wall of the first cylindrical portion 511 and the outer edge of one end face abuts against the stepped surface 514 of the cylindrical portion 51.

[0101] The guide member 52 has an axial hole 521 and a communication hole 522. The axial hole 521 is formed so as to penetrate the center of the guide member 52 in the axial direction.

[0102] The communication hole 522 is formed so as to connect the surface on the pressurized chamber 200 side with the surface on the opposite side of the pressurized chamber 200 on the radially outer side of the axial hole 521. The communication hole 522 connects the space inside the first cylindrical portion 511 on the pressurized chamber 200 side relative to the guide member 52 with the space on the opposite side of the pressurized chamber 200 relative to the guide member 52.

[0103] The valve needle 53 is disposed inside the cylindrical member 51. The valve needle 53 is formed, for example, of metal. It includes a valve needle body 531 and a retaining portion 532. The valve needle body 531 is formed in a generally cylindrical shape. The retaining portion 532 is integrally formed with the valve needle body 531, extending radially outward in a generally annular shape from the outer peripheral wall of the valve needle body 531.

[0104] The valve needle 53 is arranged such that the valve needle body 531 is inserted into the axial hole 521 of the guide member 52, and the locking portion 532 is located on the pressurized chamber 200 side relative to the guide member 52. The end of the valve needle body 531 on the pressurized chamber 200 side is located inside the communication passage 32 of the seat member 31 and can abut against the surface of the valve member 40 opposite the pressurized chamber 200. The end of the valve needle body 531 on the side opposite the pressurized chamber 200 is located on the side opposite the pressurized chamber 200 relative to the end surface of the third cylindrical portion 513 on the side opposite the second cylindrical portion 512.

[0105] The outer diameter of the portion of the valve needle body 531 corresponding to the shaft hole 521 is slightly smaller than the inner diameter of the shaft hole 521. The outer diameter of the retaining portion 532 is larger than the outer diameter of the shaft hole 521. The valve needle 53 is capable of axial reciprocating movement within the cylindrical member 51. The outer peripheral wall of the valve needle body 531 is slidable within the shaft hole 521. Therefore, the guide member 52 is capable of guiding the axial movement of the valve needle 53.

[0106] The spring 54 is, for example, a coil spring, and is disposed radially outside the valve needle body 531. One end of the spring 54 abuts against the surface of the guide member 52 on the pressurized chamber 200 side, and the other end abuts against the surface of the locking portion 532 on the opposite side from the pressurized chamber 200. That is, the locking portion 532 locks the other end of the spring 54. The spring 54 urges the valve needle 53 toward the pressurized chamber 200 side. In addition, the force of the spring 54 is greater than the force of the spring 39. Therefore, the spring 54 urges the valve member 40 toward the pressurized chamber 200 side via the valve needle 53, pressing the surface of the valve member 40 on the pressurized chamber 200 side against the stopper 35. At this time, the valve member 40 moves away from the valve seat 310 of the seat member 31, thereby opening the valve.

[0107] The movable core 55 is formed of a magnetic material in a substantially cylindrical shape, for example. The movable core 55 has an axial hole 553 and a communication hole 554. The axial hole 553 is formed to pass through the center of the movable core 55 in the axial direction.

[0108] The movable core 55 is integrally provided with the valve needle 53 so that the inner peripheral wall of the shaft hole 553 is matched (fitted) with the outer peripheral wall of the end of the valve needle body 531 opposite the pressurized chamber 200. Here, the movable core 55 is pressed into the valve needle 53 and cannot move relative to the valve needle 53.

[0109] The connecting hole 554 is formed radially outward of the axial hole 553 to connect the end surface 551 on the side opposite the pressurized chamber 200 with the end surface 552 on the pressurized chamber 200 side. This connecting hole 554 reduces the fluid resistance during the reciprocating movement of the movable core 55, enabling highly responsive movement. Furthermore, the connecting hole 554 allows fuel to be supplied to the space between the movable core 55 and the fixed core 57, suppressing sudden changes in pressure and thereby preventing cavitation erosion.

[0110] Furthermore, in this embodiment, the center of gravity of the integrally provided needle 53 and movable core 55 is always located on the axis of the needle 53 and inside the guide member 52 from valve opening to valve closing. Therefore, the axial movement of the integrally provided needle 53 and movable core 55 can be stabilized.

[0111] The magnetic throttling portion 56 is formed into a roughly cylindrical shape by, for example, a non-magnetic component. The inner diameter and outer diameter of the magnetic throttling portion 56 are roughly the same as the inner diameter and outer diameter of the third cylindrical portion 513. The magnetic throttling portion 56 is arranged on the opposite side of the pressurized chamber 200 relative to the cylindrical portion 51 in a manner roughly coaxial with the third cylindrical portion 513. The magnetic throttling portion 56 and the third cylindrical portion 513 are joined, for example, by welding. More specifically, the magnetic throttling portion 56 and the cylindrical portion 51 are melted by welding and cooled and solidified to form a weld 581 that connects the magnetic throttling portion 56 to the cylindrical portion 51. Here, the end face 551 of the movable core 55 on the opposite side of the pressurized chamber 200 is located on the inner side of the magnetic throttling portion 56.

[0112] The stationary core 57 is formed, for example, from a magnetic material. It includes a stationary core small-diameter portion 573 and a stationary core large-diameter portion 574. The stationary core small-diameter portion 573 is formed in a substantially cylindrical shape. The outer diameter of the stationary core small-diameter portion 573 is slightly larger than the inner diameter of the magnetic throttle portion 56. The stationary core small-diameter portion 573 is press-fitted into the magnetic throttle portion 56.

[0113] The stationary core large-diameter portion 574 is formed in a generally cylindrical shape, coaxially with the stationary core small-diameter portion 573, with its axial end connected to the end of the stationary core small-diameter portion 573, and is integrally formed with the stationary core small-diameter portion 573. The outer diameter of the stationary core large-diameter portion 574 is larger than that of the stationary core small-diameter portion 573 and is generally the same as the outer diameter of the magnetic throttle portion 56.

[0114] The stationary core 57 is disposed on the side of the cylindrical member 51 opposite the pressurized chamber 200, with the stationary core smaller-diameter portion 573 positioned inward of the end of the magnetic throttle portion 56 opposite the cylindrical member 51. The stationary core 57 and the magnetic throttle portion 56 are joined, for example, by welding. More specifically, a weld 582, formed when the stationary core 57 and the magnetic throttle portion 56 melt and cool and solidify during welding, connects the stationary core 57 and the magnetic throttle portion 56. The annular step surface between the stationary core smaller-diameter portion 573 and the stationary core larger-diameter portion 574 abuts the end surface of the magnetic throttle portion 56 opposite the cylindrical member 51. Furthermore, the end surface 571 of the stationary core 57 on the pressurized chamber 200 side is positioned on the pressurized chamber 200 side relative to the end surface of the magnetic throttle portion 56 opposite the cylindrical member 51. Furthermore, the stationary core 57 is disposed substantially coaxially with the magnetic throttle portion 56. When the spring 54 urges the valve needle 53 toward the pressurizing chamber 200 and the valve member 40 leaves the valve seat 310 , a gap is formed between the end surface 571 of the fixed core 57 on the pressurizing chamber 200 side and the end surface 551 of the movable core 55 on the opposite side to the pressurizing chamber 200 .

[0115] In this manner, the fixed core 57 is provided so as to face the movable core 55 in the axial direction of the needle 53 .

[0116] In this embodiment, the cylinder member 51, the guide member 52, the spring 54, the valve needle 53, the movable core 55, the magnetic throttle portion 56, and the fixed core 57 are pre-assembled and sub-assembled to form the first electromagnetic drive unit 501 (see Figure 3 ).

[0117] like Figure 2 As shown, the second electromagnetic drive unit 502 as a "coil assembly" includes a coil subassembly 650, a yoke 641 as a "first yoke", a yoke 645 as a "second yoke", an O-ring 681, and the like.

[0118] The coil subassembly 650 includes a connector 65 , a terminal 651 provided on the connector 65 , a cylindrical coil 60 connected to the terminal 651 , a bobbin 61 as a “resin portion” covering the terminal 651 and the coil 60 , and a base 652 .

[0119] Specifically, the connector portion 65 is formed of resin in a cylindrical shape. The terminal 651 is formed of conductive metal and is provided so that one end thereof is located inside the connector portion 65 .

[0120] The coil 60 is formed into a cylindrical shape by winding the winding wire and is connected to the other end of the terminal 651. The winding drum 61 is formed of resin and covers the other end side of the terminal 651 and the axial ends and radial inner side of the coil 60. The coil 60 is formed into a cylindrical shape by winding the winding wire around the cylindrical portion of the winding drum 61.

[0121] The base portion 652 is formed integrally with the connector portion 65 by resin, and covers the radially outer side of the coil 60 and both ends of the bobbin 61 in the axial direction.

[0122] In this manner, the bobbin 61 and the base 652 serving as the “resin portion” cover a portion of the terminal 651 and the coil 60 .

[0123] The yoke 641 is formed of a magnetic material in a plate shape. The yoke 641 has a yoke hole 642. The yoke hole 642 is formed in a substantially cylindrical shape so as to penetrate the yoke 641 in the plate thickness direction.

[0124] The yoke 641 is integrally provided with the coil subassembly 650 so that one surface thereof contacts the end surface of the base 652 in the axial direction of the coil 60. The yoke 641 is provided so that the cylindrical space inside the bobbin 61 and the yoke hole 642 are coaxial.

[0125] The yoke 645 is formed of a magnetic material. It includes a yoke base 646, a yoke barrel 647, and a yoke notch 648. The yoke base 646 is plate-shaped. The yoke barrel 647 is integrally formed with the yoke base 646, extending cylindrically from the outer edge of the yoke base 646. The yoke notch 648 is formed by cutting away a portion of the circumference of the yoke barrel 647.

[0126] The yoke 645 is integrally mounted with the yoke 641 and the coil subassembly 650, with the coil subassembly 650 sandwiched between the yoke 641 and the yoke 645. The end of the yoke cylindrical portion 647 opposite the yoke bottom portion 646 abuts against the outer edge of one surface of the yoke 641. The end of the yoke cylindrical portion 647 and the yoke 641 are joined, for example, by welding. More specifically, a weld 649, formed when the yoke cylindrical portion 647 and the yoke 641 melt and cool and solidify during welding, connects the yoke cylindrical portion 647 and the yoke 641.

[0127] Here, the connector portion 65 is located radially outside the yoke 645 relative to the yoke notch portion 648. The surface of the yoke bottom portion 646 on the yoke 641 side abuts against the surface of the base portion 652 on the opposite side to the yoke 641.

[0128] The O-ring 681 is formed into an annular shape from an elastic member such as rubber, that is, a resin material having an elastic modulus below a specified value. The O-ring 681 is positioned approximately coaxially with the coil 60 between the winding drum 61 and the yoke bottom 646. The O-ring 681 is sandwiched between the winding drum 61 and the yoke bottom 646 and compressed in the axial direction. This maintains a liquid-tight seal between the winding drum 61 and the yoke bottom 646, preventing water, etc., from entering the space inside the winding drum 61 from outside the second electromagnetic drive unit 502 through the yoke notch 648.

[0129] The electromagnetic drive unit 500 is Figure 3 The first electromagnetic drive unit 501 shown as the "solenoid assembly" and Figure 2 The second electromagnetic drive unit 502 shown as a "coil assembly" is assembled and configured.

[0130] like Figure 4 As shown, the electromagnetic drive unit 500 includes a weld portion 661 as a “first connection portion” and an O-ring 671 as a “second connection portion”.

[0131] The welding portion 661 as the “first connecting portion” connects the second electromagnetic driving portion 502 and the fixed core 57 on the side of the second electromagnetic driving portion 502 as the “coil assembly” opposite to the pressurizing chamber 200 .

[0132] More specifically, the first electromagnetic drive unit 501 is arranged so that the end surface 572 of the fixed core 57 opposite the pressurized chamber 200 contacts the pressurized chamber 200 side surface of the yoke bottom 646. The end surface 572 of the fixed core 57 and the yoke bottom 646 are joined by welding.

[0133] In more detail, the welding portion 661 formed by the yoke bottom 646 and the fixed core 57 being melted and cooled and solidified by welding connects the yoke bottom 646 and the fixed core 57. As a result, the yoke 645 and the fixed core 57 cannot move relative to each other. In addition, the welding portion 661 is formed in a continuous ring shape or a discontinuous ring shape in the end face 572 of the fixed core 57. In this way, the welding portion 661 connects the yoke bottom 646 of the second electromagnetic drive unit 502 and the fixed core 57 on the side opposite to the pressurized chamber 200 of the second electromagnetic drive unit 502 (see Figure 4 ).

[0134] The O-ring 671 as the “second connection portion” connects the second electromagnetic drive unit 502 and the tubular member 51 on the pressurizing chamber 200 side of the second electromagnetic drive unit 502 as the “coil assembly”.

[0135] More specifically, the O-ring 671 is provided in a substantially cylindrical space between the third cylindrical portion 513 of the cylindrical member 51 and the protruding portion 615 and the base 652 of the winding drum 61 (see FIG. Figure 5 ).

[0136] The O-ring 671 is formed into a ring shape by an elastic member such as rubber, that is, a resin material having an elastic modulus below a specified value. The O-ring 671 is sandwiched between the outer peripheral wall of the third cylindrical portion 513 of the cylindrical member 51 and the inner peripheral wall of the protrusion 615 and the base 652 of the winding drum 61, and is compressed in the radial direction. As a result, the outer peripheral wall of the third cylindrical portion 513 of the cylindrical member 51 and the inner peripheral wall of the protrusion 615 and the base 652 of the winding drum 61 are maintained liquid-tight. In this way, the O-ring 671 connects the winding drum 61 and the base 652 of the second electromagnetic drive unit 502, which serve as the "resin part", to the cylindrical member 51 on the side of the pressurized chamber 200 of the second electromagnetic drive unit 502 (see Figure 4 ).

[0137] In this embodiment, the outer diameter of the second cylindrical portion 512 of the cylindrical member 51 is smaller than the inner diameter of the yoke hole 642 of the yoke 641. Therefore, the cylindrical member 51 is not press-fitted into the yoke hole 642, and a gap is formed between the second cylindrical portion 512 and the yoke hole 642 in at least a portion of the circumference of the cylindrical member 51.

[0138] In this embodiment, the annular step surface 517 between the first cylindrical portion 511 and the second cylindrical portion 512 of the cylindrical member 51 is spaced from the surface of the yoke 641 on the pressurized chamber 200 side (see Figure 5 Therefore, in the axial direction of the cylindrical member 51 , an annular gap is formed between the yoke 641 and the stepped surface 517 of the cylindrical member 51 .

[0139] Furthermore, a substantially cylindrical gap is formed between the outer peripheral walls of the magnetic throttle portion 56 and the fixed core large-diameter portion 574 and the inner peripheral wall of the bobbin 61 .

[0140] With this structure, the second electromagnetic drive unit 502, which serves as a "coil assembly," is supported by the tubular member 51 on the pressurized chamber 200 side in the radial direction of the tubular member 51 via an O-ring 671 formed of an elastic member. This effectively prevents vibrations from the engine 1 and the high-pressure pump 10 from being transmitted to the second electromagnetic drive unit 502 via the tubular member 51.

[0141] The harness (wiring) 6 is connected to the connector portion 65 . This electrically connects the terminal 651 to the female terminal of the harness 6 , and power is supplied to the coil 60 via the harness 6 and the terminal 651 .

[0142] When the second electromagnetic drive unit 502 as the "coil assembly" vibrates while the terminal 651 is connected to the female terminal of the harness 6, there is a possibility that the terminal 651 and the female terminal of the harness 6 may slide and wear.

[0143] like Figure 4As shown, when current is supplied to the coil 60, a magnetic circuit Mc1 is formed, passing through the fixed core 57, the yoke bottom portion 646, the yoke cylindrical portion 647, the yoke 641, the second cylindrical portion 512, and the movable core 55, avoiding the magnetic throttle portion 56. This generates an attractive force between the fixed core 57 and the movable core 55, causing the movable core 55 to move toward the fixed core 57 along with the valve needle 53, resisting the biasing force of the spring 54. As a result, the valve member 40 moves toward the seat member 31 due to the biasing force of the spring 39, thereby closing the valve.

[0144] Thus, one end of the valve needle 53 is linked to the valve member 40 .

[0145] As described above, the yoke 641, which serves as the "first yoke," can form a magnetic circuit Mc1 on the pressurized chamber 200 side relative to the coil 60 in the axial direction of the coil 60 by energizing the coil 60. Furthermore, the yoke 645, which serves as the "second yoke," can form a magnetic circuit Mc1 on the side of the coil 60 opposite to the pressurized chamber 200 in the axial direction of the coil 60 by energizing the coil 60.

[0146] like Figure 5 As shown, the cylindrical member 51 and the yoke 641 serving as the "first yoke" form a magnetic path portion 505 through which the magnetic circuit Mc1 passes, formed by a portion of the second cylindrical portion 512 of the cylindrical member 51 and a portion of the yoke 641, which are radially adjacent to the cylindrical member 51. An O-ring 671 serving as the "second connecting portion" is provided on the coil 60 side relative to the magnetic path portion 505.

[0147] This can suppress the intrusion of water or the like from the outside of the electromagnetic drive unit 500 into the inside of the winding drum 61 through between the second cylindrical portion 512 of the cylindrical member 51 and the yoke hole 642 of the yoke 641 .

[0148] like Figure 5 As shown, the magnetic yoke 641, which serves as the "first magnetic yoke," has an opposing portion 643 that opposes the base portion 652 of the coil subassembly 650 in the axial direction of the coil 60. The O-ring 671, which serves as the "second connecting portion," is provided on the coil 60 side relative to the opposing portion 643. More specifically, the O-ring 671 is provided on the coil 60 side relative to an imaginary plane that passes through the opposing portion 643 and is orthogonal to the axis of the coil 60.

[0149] This can prevent water or the like from entering the inside of the spool 61 from outside the electromagnetic drive unit 500 through the yoke notch 648 and between the base 652 and the facing portion 643 of the coil subassembly 650 .

[0150] Next, a method of assembling the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 will be described.

[0151] like Figure 3As shown, first, an O-ring 671 is provided on the radially outer side of the third cylindrical portion 513 of the cylindrical member 51 of the first electromagnetic drive unit 501 after being sub-assembled.

[0152] Next, the fixed core 57 of the first electromagnetic drive unit 501 provided with the O-ring 671 is inserted into the inner sides of the yoke hole 642 and the winding drum 61 of the sub-assembly-formed second electromagnetic drive unit 502 .

[0153] Next, the end surface 572 of the fixed core 57 is brought into contact with the yoke bottom portion 646, and the fixed core 57 and the yoke bottom portion 646 are welded to form a welded portion 661 (see FIG. 1 ). Figure 4 ). Thus, the assembly of the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 is completed.

[0154] When the coil 60 is not energized, the valve member 40 is open, and the fuel chamber 260 is in communication with the pressurized chamber 200. At this time, if the plunger 11 moves toward the side away from the pressurized chamber 200, the volume of the pressurized chamber 200 increases, and the fuel in the fuel chamber 260 flows into the first cylindrical portion 511 through the hole 515, and the fuel is drawn into the pressurized chamber 200 through the suction hole 232. Furthermore, if the plunger 11 moves toward the pressurized chamber 200 while the valve member 40 is open, the volume of the pressurized chamber 200 decreases, and the fuel in the pressurized chamber 200 flows toward the valve member 40 through the suction hole 232.

[0155] When the coil 60 is energized while the plunger 11 is moving toward the pressurized chamber 200, the valve member 40 closes, blocking the flow of fuel between the fuel chamber 260 and the pressurized chamber 200. If the plunger 11 moves further toward the pressurized chamber 200 while the valve member 40 is closed, the volume of the pressurized chamber 200 decreases further, pressurizing the fuel within the pressurized chamber 200.

[0156] Thus, at any point (timing) while the plunger 11 is moving toward the pressurizing chamber 200, the electromagnetic drive unit 500 closes the valve member 40, thereby adjusting the amount of fuel pressurized in the pressurizing chamber 200. In this embodiment, the intake valve unit 300 and the electromagnetic drive unit 500 constitute a normally open valve device.

[0157] like Figure 1 As shown, the discharge passage portion 700 is provided so as to protrude radially outward from the discharge hole portion 214 of the upper housing 21 through the cover hole portion 267 of the cover 26 .

[0158] The discharge passage portion 700 includes a discharge joint 70 , a discharge valve 75 , a pressure relief valve (relief valve) 91 , and the like.

[0159] The discharge nipple 70 is formed into a generally cylindrical shape from a metal such as stainless steel. Threads are formed on the outer peripheral wall of the discharge nipple 70 at a predetermined distance from one end toward the other end. A thread groove corresponding to the thread of the discharge nipple 70 is formed on the inner peripheral wall of the discharge hole 214 of the upper housing 21. The discharge nipple 70 is configured so that the thread engages with the thread groove of the upper housing 21.

[0160] The discharge nipple 70 is provided inside the cover hole portion 267 of the cover 26. The end of the discharge nipple 70 on the pressurized chamber 200 side is located inside the cover tube portion 261, inside the discharge hole portion 214, i.e., in the discharge passage 217, while the end on the opposite side from the pressurized chamber 200 side is located outside the cover tube portion 261.

[0161] The discharge joint 70 has a discharge passage 705 formed inside. Fuel discharged from the pressurizing chamber 200 flows through the discharge passage 705. Here, the discharge joint 70 corresponds to a "discharge passage forming portion."

[0162] A welding ring 709 is provided on the outside of the cover 26, radially outward of the discharge nipple 70. The welding ring 709 is formed, for example, from metal into a substantially cylindrical shape. The welding ring 709 is formed so that the end portion on the pressure chamber 200 side extends radially outward, and abuts against the periphery of the cover hole portion 267 of the cover outer peripheral wall. The end portion of the welding ring 709 on the pressure chamber 200 side is welded to the cover outer peripheral wall over the entire circumferential range, and the portion on the opposite side from the pressure chamber 200 is welded to the outer peripheral wall of the discharge nipple 70 over the entire circumferential range. This prevents the fuel in the fuel chamber 260 from leaking to the outside of the cover 26 through the gap between the cover hole portion 267 and the outer peripheral wall of the discharge nipple 70.

[0163] The high-pressure fuel pipe 8 is connected to the end of the discharge joint 70 opposite the pressurization chamber 200. As a result, fuel flowing from the supply fuel pipe into the fuel chamber 260 via the supply passage of the high-pressure pump 10 is pressurized by the pressurization chamber 200 and discharged into the high-pressure fuel pipe 8 via the discharge passage 705 inside the discharge joint 70. The high-pressure fuel discharged into the high-pressure fuel pipe 8 is supplied to the fuel rail via the high-pressure fuel pipe 8.

[0164] The discharge valve 75 and the pressure relief valve 91 are provided in the discharge passage 705 inside the discharge joint 70 .

[0165] The discharge valve 75 opens when the pressure difference between the fuel on the pressurizing chamber 200 side of the discharge valve 75 and the fuel on the high-pressure fuel pipe 8 side of the discharge passage 705 becomes greater than a predetermined value, thereby allowing the flow of fuel in the discharge passage 705. On the other hand, the discharge valve 75 closes when the pressure difference between the fuel on the pressurizing chamber 200 side of the discharge valve 75 and the fuel on the high-pressure fuel pipe 8 side of the discharge passage 705 becomes less than a predetermined value, thereby restricting the flow of fuel in the discharge passage 705.

[0166] The pressure relief valve 91 opens when the pressure difference between the fuel on the high-pressure fuel pipe 8 side of the discharge passage 705 relative to the pressure relief valve 91 and the fuel on the pressurization chamber 200 side becomes equal to or greater than a predetermined value, thereby allowing the flow of fuel in the discharge passage 705. On the other hand, the pressure relief valve 91 closes when the pressure difference between the fuel on the high-pressure fuel pipe 8 side of the discharge passage 705 relative to the pressure relief valve 91 and the fuel on the pressurization chamber 200 side becomes less than a predetermined value, thereby restricting the flow of fuel in the discharge passage 705.

[0167] If the pressure of the fuel in the discharge passage 705 on the side of the high-pressure fuel pipe 8 relative to the pressure relief valve 91 rises to an abnormal value, the pressure relief valve 91 opens. Consequently, the fuel in the discharge passage 705 on the side of the high-pressure fuel pipe 8 relative to the pressure relief valve 91 is returned to the pressurizing chamber 200. This operation of the pressure relief valve 91 prevents the pressure of the fuel in the high-pressure fuel pipe 8 from reaching an abnormal value.

[0168] In this embodiment, the high-pressure pump 10 further includes a pulsation damper 15. The pulsation damper 15 is formed by laminating two thin metal plates, for example, circular disks, and welding their outer edges together. A gas such as nitrogen or argon at a predetermined pressure is sealed inside the pulsation damper 15. The pulsation damper 15 is disposed between the cover bottom 262 of the fuel chamber 260 and the upper housing 21.

[0169] Next, the installation of the high-pressure pump 10 to the engine 1 will be described.

[0170] In this embodiment, the high-pressure pump 10 is mounted on the engine 1 by inserting the holder support portion 24 into the mounting hole portion 3 of the engine cylinder head 2 (see FIG. Figure 1 The high-pressure pump 10 is fixed to the engine 1 by bolting the lower housing 22 to the engine cylinder head 2. Here, the high-pressure pump 10 is mounted on the engine 1 in a posture such that the axis Ax1 of the cylinder block 23 is along the vertical direction.

[0171] Next, the operation of the high-pressure pump 10 according to this embodiment will be described.

[0172] "Inhalation process"

[0173] When the electromagnetic drive unit 500 stops supplying power to the coil 60, the valve member 40 is biased toward the pressurized chamber 200 by the spring 54 and the valve needle 53. Consequently, the valve member 40 separates from the valve seat 310, effectively opening the valve. In this state, if the plunger 11 moves toward the side opposite to the pressurized chamber 200, the volume of the pressurized chamber 200 increases, and fuel located on the fuel chamber 260 side, opposite to the valve seat 310, is drawn into the pressurized chamber 200 through the communication passage 32.

[0174] “Quantity adjustment process”

[0175] When the plunger 11 moves toward the pressurized chamber 200 while the valve member 40 is open, the volume of the pressurized chamber 200 decreases, and fuel on the pressurized chamber 200 side relative to the valve seat 310 is returned to the fuel chamber 260 side relative to the valve seat 310. During the flow adjustment process, if power is supplied to the coil 60, the movable core 55 and the valve needle 53 are attracted toward the fixed core 57. The valve member 40, biased by the spring 39, abuts against the valve seat 310, closing the valve. As the plunger 11 moves toward the pressurized chamber 200, the valve member 40 closes, adjusting the amount of fuel returned from the pressurized chamber 200 to the fuel chamber 260. This determines the amount of fuel pressurized in the pressurized chamber 200. The flow adjustment process, which returns fuel from the pressurized chamber 200 to the fuel chamber 260 by closing the valve member 40, completes.

[0176] When the fuel injection valve is not injecting fuel, that is, when the fuel is off, the coil 60 is not energized, and the fuel ejection from the high-pressure pump 10 is zero. At this time, since the valve member 40 is in the open state, the fuel in the pressurization chamber 200 flows between the pressurization chamber 200 and the fuel chamber 260 side as the plunger 11 reciprocates.

[0177] "Pressure process"

[0178] When the plunger 11 moves further toward the pressurization chamber 200 while the valve member 40 is closed, the volume of the pressurization chamber 200 decreases, and the fuel in the pressurization chamber 200 is compressed and pressurized. When the pressure of the fuel in the pressurization chamber 200 exceeds the valve opening pressure of the discharge valve 75, the discharge valve 75 opens, and the fuel is discharged from the pressurization chamber 200 toward the high-pressure fuel pipe 8, i.e., the fuel rail.

[0179] When the power supply to the coil 60 is stopped, the plunger 11 moves to the side opposite to the pressurizing chamber 200, and the valve member 40 opens again. Thus, the pressurizing process of pressurizing the fuel ends, and the intake process of sucking the fuel from the fuel chamber 260 side to the pressurizing chamber 200 side resumes.

[0180] By repeating the aforementioned "intake step," "amount adjustment step," and "pressurization step," high-pressure pump 10 pressurizes the fuel drawn into fuel chamber 260 within pressurization chamber 200 and discharges it to the fuel rail. The amount of fuel supplied from high-pressure pump 10 to the fuel rail is adjusted by controlling, for example, the timing of the power supply to coil 60 of electromagnetic drive unit 500.

[0181] Furthermore, during the aforementioned "intake step" and "volume adjustment step," when the plunger 11 reciprocates while the valve member 40 is open, pressure pulsation may occur in the fuel within the fuel chamber 260 due to the increase or decrease in the volume of the pressurizing chamber 200. The pulsation damper 15 provided in the fuel chamber 260 elastically deforms in response to changes in the fuel pressure within the fuel chamber 260, thereby reducing pressure pulsation in the fuel within the fuel chamber 260.

[0182] Furthermore, when the plunger 11 reciprocates, pressure pulsations may occur due to the increase or decrease in the volume of the variable volume chamber 201. In this case, the pulsation damper 15 also elastically deforms in response to changes in the fuel pressure in the fuel chamber 260, thereby reducing the pressure pulsations of the fuel in the fuel chamber 260.

[0183] Furthermore, when the plunger 11 descends, the volume of the variable volume chamber 201 decreases in accordance with the plunger 11's descending speed, forcing fuel toward the fuel chamber 260. As a result, when the plunger 11 descends, fuel in the fuel chamber 260 is more easily introduced into the pressurized chamber 200. Furthermore, when the plunger 11 ascends, the volume of the variable volume chamber 201 increases, making it easier for fuel returned from the pressurized chamber 200 to be discharged into the variable volume chamber 201 during flow adjustment. This action reduces pulsation in the fuel chamber 260.

[0184] Furthermore, as the plunger 11 reciprocates, the volume of the variable volume chamber 201 increases and decreases, causing the fuel to reciprocate between the fuel chamber 260, the annular space 202, and the variable volume chamber 201. This allows the cylinder 23 and plunger 11, which have reached high temperatures due to heat generated by the sliding movement of the plunger 11 and cylinder 23, as well as heat generated by the pressurization of the fuel in the pressurization chamber 200, to be cooled by the low-temperature fuel. This prevents seizure (burning) of the plunger 11 and cylinder 23.

[0185] Furthermore, a portion of the fuel, which has become highly pressurized in the pressurized chamber 200, flows into the variable volume chamber 201 through the clearance between the plunger 11 and the cylinder 23. This forms an oil film between the plunger 11 and the cylinder 23, effectively preventing seizure of the plunger 11 and the cylinder 23. Furthermore, the fuel that has flowed from the pressurized chamber 200 into the variable volume chamber 201 returns to the fuel chamber 260 through the annular space 202.

[0186] In this embodiment, the high-pressure pump 10 is mounted on the engine 1 for use. Therefore, due to the vibrations of the engine 1 and the vibrations during operation of the high-pressure pump 10, the lower housing 22 and upper housing 21 of the high-pressure pump 10 vibrate, and the tubular member 51 of the first electromagnetic drive unit 501 connected to the upper housing 21 also vibrates. As a result, the vibrations are transmitted to the second electromagnetic drive unit 502 connected to the upper housing 21 via the tubular member 51, potentially causing the terminal 651 of the coil subassembly 650 to vibrate.

[0187] However, in this embodiment, when assembling the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502, an O-ring 671 serving as a "second connecting portion" is sandwiched between the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 so that no gap is formed after assembly and the two units are in close contact. In addition, after assembly, the yoke 645 of the second electromagnetic drive unit 502 is connected to the fixed core 57 via the welding portion 661 serving as the "first connecting portion", and the coil subassembly 650 of the second electromagnetic drive unit 502 is connected to the barrel component 51 via the O-ring 671 serving as the "second connecting portion". Therefore, the vibration of the terminal 651 caused by the vibration of the engine 1 and the vibration during the operation of the high-pressure pump 10 can be suppressed. As a result, the wear of the terminal 651 can be suppressed, and poor conduction can be suppressed.

[0188] Furthermore, in this embodiment, the yokes 641 and 645 exposed to the outside of the second electromagnetic drive unit 502 are formed of a material with relatively high corrosion resistance. Furthermore, the O-ring 681, the weld 661 serving as the "first connection," and the O-ring 671 serving as the "second connection" prevent water and other substances from entering the stationary core 57 from the outside. This improves the corrosion resistance of the yokes 641, 645, and stationary core 57.

[0189] Furthermore, in this embodiment, the O-ring 671 serving as the "second connection portion" is provided in the annular space formed between the coil subassembly 650 and the cylindrical member 51. Therefore, it is not necessary to modify the yokes 641 and 645 serving as the magnetic path, thereby suppressing the influence on the attractive force.

[0190] In addition, in this embodiment, by using the O-ring 671 as the "second connecting part" to fill the annular space between the coil sub-assembly 650 and the cylindrical component 51, it is possible to suppress the intrusion of water, etc. into the electromagnetic drive part 500 and improve the corrosion resistance of the fixed core 57, etc.

[0191] As described above, in this embodiment, the weld portion 661, which serves as the "first connecting portion," connects the second electromagnetic drive unit 502, which serves as the "coil assembly," to the fixed core 57 on the side opposite the pressurized chamber 200 of the second electromagnetic drive unit 502. The O-ring 671, which serves as the "second connecting portion," connects the second electromagnetic drive unit 502 to the cylindrical member 51 on the pressurized chamber 200 side of the second electromagnetic drive unit 502.

[0192] In this embodiment, the second electromagnetic drive unit 502 is supported by the fixed core 57 via a weld 661 on the side opposite the pressurized chamber 200, and is supported by the cylindrical member 51 via an O-ring 671 on the side facing the pressurized chamber 200. In other words, the second electromagnetic drive unit 502 is supported at both ends in the axial direction by other portions (the weld 661 and the O-ring 671).

[0193] Therefore, when the high-pressure pump 10 is installed in the engine 1, vibrations of the second electromagnetic driver 502 caused by vibrations of the engine 1 and vibrations during operation of the high-pressure pump 10 can be suppressed. This suppresses vibration and wear of the terminal 651, thereby preventing poor conduction. Consequently, malfunctions in the operation of the intake valve unit 300 and poor discharge from the high-pressure pump 10 can be suppressed.

[0194] Furthermore, in this embodiment, the cylindrical member 51 and the yoke 641 serving as the "first yoke" form the magnetic path portion 505 by a portion of the second cylindrical portion 512 of the cylindrical member 51 and a portion of the yoke 641, which are radially adjacent to the cylindrical member 51. The O-ring 671 serving as the "second connecting portion" is provided on the coil 60 side relative to the magnetic path portion 505.

[0195] This effectively suppresses vibrations of the second electromagnetic driver 502 while ensuring the cross-sectional area of the magnetic circuit. Furthermore, it prevents water, etc., from entering the interior of the winding drum 61 from outside the electromagnetic driver 500 through the space between the second cylindrical portion 512 of the cylindrical member 51 and the yoke hole 642 of the yoke 641. Consequently, corrosion of the fixed core 57 can be suppressed.

[0196] In addition, in this embodiment, the yoke 641 as the "first yoke" has an opposing portion 643 that is opposed to the base 652 of the coil subassembly 650 in the axial direction of the coil 60. The O-ring 671 as the "second connecting portion" is provided on the coil 60 side relative to the opposing portion 643.

[0197] This prevents water from entering the spool 61 from outside the electromagnetic drive unit 500 through the yoke notch 648 and between the base 652 and the facing portion 643 of the coil subassembly 650. As a result, corrosion of the fixed core 57 can be effectively prevented.

[0198] Furthermore, in the present embodiment, the O-ring 671 serving as the “second connection portion” is formed into a ring shape by an elastic member.

[0199] Therefore, vibrations of the second electromagnetic drive unit 502 caused by vibrations of the engine 1 and the high-pressure pump 10 during operation can be more effectively suppressed. Furthermore, the O-ring 671 maintains a fluid-tight seal between the second electromagnetic drive unit 502 and the tubular member 51, thereby suppressing corrosion of the internal fixed core 57 and other components. Furthermore, the O-ring 671 reduces the operating noise of the electromagnetic drive unit 500.

[0200] (Second embodiment)

[0201] exist Figure 6 A portion of a high-pressure pump according to a second embodiment is shown in FIG. The second embodiment differs from the first embodiment in the structure of a second connecting portion and the like.

[0202] In the present embodiment, the outer peripheral wall of the third cylindrical portion 513 of the cylindrical member 51 on the second cylindrical portion 512 side is tapered so as to approach the axis of the cylindrical member 51 as it moves from the second cylindrical portion 512 side toward the magnetic throttle portion 56 side.

[0203] The inner peripheral wall of the protruding portion 615 of the spool 61 is formed in a tapered shape so as to approach the axis of the spool 61 as it moves from the pressurized chamber 200 side toward the side opposite to the pressurized chamber 200 .

[0204] This embodiment includes a coating portion 672 as a "second connecting portion." The coating portion 672 is made of an elastic member such as an adhesive, that is, a resin material having an elastic modulus of a predetermined value or less, and is formed into a cylindrical shape to cover the outer peripheral wall of the third cylindrical portion 513 of the cylindrical member 51, the magnetic throttle portion 56, and the fixed core large-diameter portion 574 of the fixed core 57, over the entire circumferential range.

[0205] The outer peripheral wall of the coating portion 672 contacts the inner peripheral wall of the winding drum 61 and the base portion 652. Thus, the coating portion 672 connects the winding drum 61 and the base portion 652 of the second electromagnetic drive unit 502, which serves as a "coil assembly," to the drum member 51, the magnetic throttle portion 56, and the fixed core 57. Thus, the coating portion 672 connects the winding drum 61 and the base portion 652 to the drum member 51 on the pressurized chamber 200 side of the second electromagnetic drive unit 502, which serves as a "coil assembly."

[0206] Next, a method of assembling the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 will be described.

[0207] First, the coating portion 672 is provided so as to cover the entire circumferential extent of the outer peripheral walls of the third cylindrical portion 513 of the cylindrical member 51 of the first electromagnetic drive unit 501, the magnetic throttle portion 56, and the stationary core large diameter portion 574 of the stationary core 57 after the subassembly. At this point, the coating portion 672 is not yet hardened.

[0208] Next, the fixed core 57 of the first electromagnetic drive unit 501, provided with the coating portion 672, is inserted into the inner side of the yoke hole 642 and the winding drum 61 of the sub-assembly of the second electromagnetic drive unit 502. Note that at this point, the coating portion 672 has not yet hardened and is in close contact with the inner peripheral wall of the winding drum 61 and the base portion 652.

[0209] Next, the end surface 572 of the fixed core 57 is brought into contact with the yoke bottom portion 646, and the fixed core 57 and the yoke bottom portion 646 are welded to form a welded portion 661. Thus, the assembly of the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 is completed.

[0210] When the fixed core 57 of the first electromagnetic drive unit 501 is inserted into the second electromagnetic drive unit 502 and a predetermined time passes, the coating portion 672 hardens due to moisture. In this embodiment, the coating portion 672 is formed of a material having elasticity even after hardening.

[0211] In this embodiment, during assembly of the first and second electromagnetic drive units 501 and 502, the outer peripheral walls of the cylindrical member 51, magnetic throttle 56, and stationary core 57 of the first electromagnetic drive unit 501 are coated with a resin coating 672. This ensures that, after assembly, the first and second electromagnetic drive units 501 and 502 are in close contact with each other without any gap. Furthermore, after assembly, the yoke 645 of the second electromagnetic drive unit 502 is connected to the stationary core 57 by a weld 661, serving as a "first connection," and the coil subassembly 650 of the second electromagnetic drive unit 502 is connected to the cylindrical member 51, magnetic throttle 56, and stationary core 57 by a coating 672, serving as a "second connection." This suppresses vibration of the terminal 651 caused by vibrations from the engine 1 and the high-pressure pump 10 during operation. This reduces wear on the terminal 651 and prevents poor conduction.

[0212] Furthermore, in this embodiment, the coating portion 672, which serves as the "second connecting portion," is provided in the cylindrical space formed between the coil subassembly 650 and the cylindrical member 51, the magnetic throttle portion 56, and the fixed core 57. Therefore, it is no longer necessary to modify the yokes 641 and 645 that serve as the magnetic path, thereby suppressing the effect on the attractive force.

[0213] In addition, in this embodiment, by utilizing the coating portion 672 serving as the "second connecting portion" to fill the cylindrical space between the coil sub-assembly 650 and the cylindrical component 51, the magnetic throttling portion 56, and the fixed core 57, it is possible to suppress the intrusion of water, etc. into the interior of the electromagnetic drive portion 500, thereby improving the corrosion resistance of the fixed core 57, etc.

[0214] Furthermore, in this embodiment, since the coating portion 672, serving as the "second connecting portion," is formed into a cylindrical shape, it is possible to easily increase the contact area between the coating portion 672 and the coil subassembly 650 of the second electromagnetic drive unit 502 and the cylindrical member 51 of the first electromagnetic drive unit 501. Consequently, vibrations of the terminal 651 caused by vibrations of the engine 1 and during operation of the high-pressure pump 10 can be more effectively suppressed.

[0215] As described above, in this embodiment, the coating portion 672 as the “second connecting portion” connects the second electromagnetic driving portion 502 and the tubular member 51 on the pressurizing chamber 200 side of the second electromagnetic driving portion 502 .

[0216] Therefore, similar to the first embodiment, vibration and wear of the terminal 651 can be suppressed, and conduction failure can be suppressed. As a result, operation failure of the suction valve portion 300 can be suppressed, and discharge failure of the high-pressure pump 10 can be suppressed.

[0217] Furthermore, in the present embodiment, a portion of the coating portion 672 serving as the “second connecting portion” is provided on the coil 60 side with respect to the magnetic path portion 505 .

[0218] In addition, in the present embodiment, a part of the coating portion 672 serving as the “second connecting portion” is provided on the coil 60 side with respect to the facing portion 643 .

[0219] Therefore, similar to the first embodiment, the cross-sectional area of the magnetic circuit can be ensured while effectively suppressing vibration of the second electromagnetic drive unit 502. Furthermore, it is possible to suppress the intrusion of water, etc., from the outside of the electromagnetic drive unit 500 into the inside of the winding drum 61. As a result, corrosion of the fixed core 57 can be effectively suppressed.

[0220] Furthermore, in the present embodiment, the coating portion 672 serving as the “second connecting portion” is formed of an elastic member into a cylindrical, ie, annular, shape.

[0221] Therefore, similar to the first embodiment, vibrations of the second electromagnetic drive unit 502 caused by vibrations of the engine 1 and the high-pressure pump 10 during operation can be more effectively suppressed. Furthermore, the coating portion 672 maintains a fluid-tight seal between the second electromagnetic drive unit 502 and the tubular member 51, thereby suppressing corrosion of the internal fixed core 57 and other components. Furthermore, the coating portion 672 can reduce the operating noise of the electromagnetic drive unit 500.

[0222] (Third embodiment)

[0223] exist Figure 7 A portion of a high-pressure pump according to a third embodiment is shown in FIG. The third embodiment differs from the second embodiment in the structure of the second connecting portion and the like.

[0224] This embodiment includes a plate rubber 673 as a “second connecting portion”.

[0225] The plate rubber 673 is formed into an annular plate shape by an elastic member such as rubber, that is, a resin material having an elastic modulus of a predetermined value or less.

[0226] The plate rubber 673 connects the second electromagnetic drive unit 502 and the tubular member 51 on the pressurizing chamber 200 side of the second electromagnetic drive unit 502 .

[0227] The plate rubber 673 is provided between the yoke 641 and the tubular member 51 in the axial direction of the tubular member 51 .

[0228] More specifically, the inner diameter of the plate rubber 673 is substantially the same as the outer diameter of the second cylindrical portion 512 of the cylindrical member 51. The plate rubber 673 is provided radially outward of the second cylindrical portion 512 of the cylindrical member 51 between the stepped surface 517 and the surface of the yoke 641 facing the pressurized chamber 200.

[0229] The plate rubber 673 is compressed in the axial direction by being sandwiched between the stepped surface 517 and the surface of the yoke 641 on the pressurized chamber 200 side. This maintains a liquid-tight seal between the stepped surface 517 of the tubular member 51 and the yoke 641, thereby preventing water and the like from entering the space inside the electromagnetic drive unit 500 from outside the electromagnetic drive unit 500 through the space between the stepped surface 517 and the yoke 641.

[0230] Next, a method of assembling the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 will be described.

[0231] First, the plate rubber 673 is provided on the radially outer side of the second cylindrical portion 512 of the cylindrical member 51 of the first electromagnetic drive unit 501 after being assembled into a subassembly.

[0232] Next, the fixed core 57 of the first electromagnetic drive unit 501 provided with the plate rubber 673 is inserted into the inner sides of the yoke hole 642 and the winding drum 61 of the sub-assembly-formed second electromagnetic drive unit 502 .

[0233] Next, the end surface 572 of the fixed core 57 is brought into contact with the yoke bottom portion 646, and the fixed core 57 and the yoke bottom portion 646 are welded to form a welded portion 661. Thus, the assembly of the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 is completed.

[0234] Furthermore, after the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 are assembled, the plate rubber 673 is compressed in the axial direction.

[0235] In this embodiment, during assembly of the first and second electromagnetic drive units 501 and 502, a plate rubber 673, serving as a "second connecting portion," is interposed between the stepped surface 517 of the cylindrical member 51 of the first electromagnetic drive unit 501 and the yoke 641 of the second electromagnetic drive unit 502, ensuring close contact with each other in the axial direction of the cylindrical member 51 without any gap. Furthermore, after assembly, the yoke 645 of the second electromagnetic drive unit 502 is connected to the fixed core 57 by the weld 661, serving as the "first connecting portion," and the yoke 641 of the second electromagnetic drive unit 502 is connected to the cylindrical member 51 by the plate rubber 673, serving as the "second connecting portion." This suppresses vibration of the terminal 651 caused by vibrations from the engine 1 and the high-pressure pump 10 during operation. This reduces wear on the terminal 651 and prevents poor conduction.

[0236] Furthermore, in this embodiment, the plate rubber 673 serving as the "second connection portion" is provided in the annular gap formed between the yoke 641 and the stepped surface 517 of the tubular member 51. Therefore, it is unnecessary to modify the yokes 641 and 645 serving as the magnetic path, thereby minimizing the effect on the attractive force.

[0237] In addition, in this embodiment, by using the plate rubber 673 as the "second connecting part" to fill the annular gap between the yoke 641 and the step surface 517 of the cylindrical part 51, it is possible to suppress the intrusion of water, etc. into the interior of the electromagnetic drive part 500 and improve the corrosion resistance of the fixed core 57, etc.

[0238] Furthermore, in this embodiment, the plate rubber 673 serving as the "second connection portion" is provided at a position that can be recognized from the outside. Therefore, it is possible to suppress the occurrence of missing parts and process omissions.

[0239] As described above, in this embodiment, the plate rubber 673 serving as the “second connecting portion” connects the second electromagnetic drive unit 502 and the tubular member 51 on the pressurizing chamber 200 side of the second electromagnetic drive unit 502 .

[0240] Therefore, similar to the second embodiment, vibration and wear of the terminal 651 can be suppressed, and conduction failure can be suppressed. As a result, malfunction of the suction valve portion 300 can be suppressed, and discharge failure of the high-pressure pump 10 can be suppressed.

[0241] Furthermore, in the present embodiment, the plate rubber 673 as the “second connecting portion” is provided between the yoke 641 as the “first yoke” and the tubular member 51 in the axial direction of the tubular member 51 .

[0242] This effectively suppresses vibration of the second electromagnetic driver 502 while ensuring the cross-sectional area of the magnetic circuit. Furthermore, it suppresses the intrusion of water, etc., from the outside of the electromagnetic driver 500 into the inside of the electromagnetic driver 500. Consequently, corrosion of the fixed core 57, etc., can be suppressed.

[0243] Furthermore, in the present embodiment, the plate rubber 673 serving as the “second connecting portion” is formed in an annular shape by an elastic member.

[0244] Therefore, similar to the second embodiment, vibrations of the second electromagnetic drive unit 502 caused by vibrations of the engine 1 and the high-pressure pump 10 during operation can be more effectively suppressed. Furthermore, the sheet rubber 673 maintains a fluid-tight seal between the second electromagnetic drive unit 502 and the tubular member 51, thereby suppressing corrosion of the internal fixed core 57 and other components. Furthermore, the sheet rubber 673 can reduce the operating noise of the electromagnetic drive unit 500.

[0245] (Fourth embodiment)

[0246] exist Figure 8 A portion of a high-pressure pump according to a fourth embodiment is shown in FIG. The fourth embodiment differs from the third embodiment in the structure of the second connecting portion and the like.

[0247] This embodiment includes a contact surface 674 as a “second connecting portion”.

[0248] The contact surface 674 is provided between the yoke 641 and the tubular member 51 in the axial direction of the tubular member 51 .

[0249] More specifically, the contact surface 674 is an abutment surface between the yoke 641 and the stepped surface 517 of the tubular member 51 in the axial direction of the tubular member 51 , and is formed in an annular shape.

[0250] More specifically, the contact surface 674 is an abutment surface between the surface of the yoke 641 on the pressurized chamber 200 side in the axial direction of the tubular member 51 and the stepped surface 517 of the tubular member 51 , and is formed into an annular flat surface.

[0251] The contact surface 674 connects the surface of the yoke 641 on the pressurizing chamber 200 side and the stepped surface 517 of the tubular member 51 .

[0252] That is, the contact surface 674 connects the second electromagnetic drive unit 502 and the tubular member 51 on the pressurizing chamber 200 side of the second electromagnetic drive unit 502 .

[0253] An axial force of a predetermined magnitude acts on the contact surface 674 along the axial direction of the cylindrical member 51. Thus, the gap between the stepped surface 517 of the cylindrical member 51 and the yoke 641 is kept liquid-tight, thereby preventing water or the like from entering the space inside the electromagnetic drive unit 500 from outside the electromagnetic drive unit 500 through the gap between the stepped surface 517 and the yoke 641.

[0254] Next, a method of assembling the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 will be described.

[0255] First, the fixed core 57 of the sub-assembly-formed first electromagnetic drive unit 501 is inserted into the inner sides of the yoke hole 642 and the winding drum 61 of the sub-assembly-formed second electromagnetic drive unit 502 .

[0256] Next, the stepped surface 517 of the tubular member 51 is brought into contact with the surface of the yoke 641 on the pressurizing chamber 200 side, and the first electromagnetic drive unit 501 is further pushed toward the second electromagnetic drive unit 502 .

[0257] Next, the end surface 572 of the fixed core 57 is brought into contact with the yoke bottom portion 646, and the fixed core 57 and the yoke bottom portion 646 are welded to form a welded portion 661. Thus, the assembly of the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 is completed.

[0258] Furthermore, after the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 are assembled, an axial force of a predetermined magnitude acts on the contact surface 674 along the axial direction of the tubular member 51 .

[0259] In this embodiment, when assembling the first and second electromagnetic drive units 501 and 502, the stepped surface 517 of the cylindrical member 51 of the first electromagnetic drive unit 501 is brought into close contact with the yoke 641 of the second electromagnetic drive unit 502, ensuring no gap in the axial direction of the cylindrical member 51. This creates an annular contact surface 674. Furthermore, after assembly, the yoke 645 of the second electromagnetic drive unit 502 is connected to the fixed core 57 by the weld 661, serving as the "first connection portion," and the yoke 641 of the second electromagnetic drive unit 502 is connected to the cylindrical member 51 by the contact surface 674, serving as the "second connection portion." This suppresses vibration of the terminal 651 caused by vibrations from the engine 1 and the high-pressure pump 10 during operation. This reduces wear on the terminal 651 and prevents poor conduction.

[0260] In addition, in this embodiment, by utilizing the abutment surface 674 serving as the "second connection portion" to fill the annular gap between the yoke 641 and the step surface 517 of the tubular component 51, that is, by eliminating the above-mentioned gap, it is possible to suppress the intrusion of water, etc. into the interior of the electromagnetic drive portion 500, thereby improving the corrosion resistance of the fixed core 57, etc.

[0261] Furthermore, in this embodiment, unlike the first to third embodiments, an additional component as a "second connecting portion" is not required, and thus the number of components can be reduced.

[0262] As described above, in this embodiment, the contact surface 674 serving as the “second connecting portion” connects the second electromagnetic drive unit 502 and the tubular member 51 on the pressurizing chamber 200 side of the second electromagnetic drive unit 502 .

[0263] Therefore, similar to the third embodiment, vibration and wear of the terminal 651 can be suppressed, and conduction failure can be suppressed. As a result, malfunction of the suction valve portion 300 can be suppressed, and discharge failure of the high-pressure pump 10 can be suppressed.

[0264] Furthermore, in the present embodiment, the contact surface 674 as the “second connecting portion” is provided between the yoke 641 as the “first yoke” and the tubular member 51 in the axial direction of the tubular member 51 .

[0265] This effectively suppresses vibration of the second electromagnetic driver 502 while ensuring the cross-sectional area of the magnetic circuit. Furthermore, it suppresses the intrusion of water, etc., from the outside of the electromagnetic driver 500 into the inside of the electromagnetic driver 500. Consequently, corrosion of the fixed core 57, etc., can be suppressed.

[0266] In the present embodiment, the contact surface 674 as the “second connection portion” is the contact surface between the yoke 641 as the “first yoke” and the tubular member 51 in the axial direction of the tubular member 51 , and is formed in an annular shape.

[0267] Therefore, it is possible to more effectively suppress the vibration of the second electromagnetic drive unit 502. In addition, it is possible to more effectively suppress the intrusion of water or the like from the outside of the electromagnetic drive unit 500 into the inside of the electromagnetic drive unit 500.

[0268] (Fifth embodiment)

[0269] exist Figure 9 1 shows a part of a high-pressure pump according to a fifth embodiment. The fifth embodiment differs from the third embodiment in the structure of the second connecting portion and the like.

[0270] In this embodiment, the outer diameter of the second cylindrical portion 512 of the cylindrical member 51 is larger than the inner diameter of the yoke hole 642 of the yoke 641. The second cylindrical portion 512 of the cylindrical member 51 is press-fitted into the yoke hole 642.

[0271] This embodiment includes a contact surface 675 as a “second connecting portion”.

[0272] The contact surface 675 is an abutment surface between the yoke 641 and the tubular member 51 in the radial direction of the tubular member 51 , and is formed in an annular shape.

[0273] More specifically, the contact surface 675 is a contact surface between the inner peripheral wall of the yoke hole 642 of the yoke 641 and the outer peripheral wall of the second cylindrical portion 512 of the cylindrical member 51 in the radial direction of the cylindrical member 51 , and is formed in a cylindrical shape.

[0274] The contact surface 675 connects the inner peripheral wall of the yoke hole portion 642 of the yoke 641 and the outer peripheral wall of the second tubular portion 512 of the tubular member 51 .

[0275] That is, the contact surface 675 connects the second electromagnetic drive unit 502 and the tubular member 51 on the pressurizing chamber 200 side of the second electromagnetic drive unit 502 .

[0276] A force of a predetermined magnitude acts on the contact surface 675 along the radial direction of the cylindrical member 51. As a result, the outer peripheral wall of the second cylindrical portion 512 of the cylindrical member 51 and the inner peripheral wall of the yoke hole 642 of the yoke 641 are maintained liquid-tight, thereby preventing water and the like from entering the space inside the electromagnetic drive unit 500 from outside the electromagnetic drive unit 500 through the space between the cylindrical member 51 and the yoke 641.

[0277] Next, a method of assembling the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 will be described.

[0278] First, the fixed core 57 of the sub-assembly-formed first electromagnetic drive unit 501 is inserted into the inner sides of the yoke hole 642 and the winding drum 61 of the sub-assembly-formed second electromagnetic drive unit 502 .

[0279] Next, the outer peripheral wall of the second cylindrical portion 512 of the cylindrical member 51 is pressed into contact with and slides against the inner peripheral wall of the yoke hole 642 of the yoke 641 , thereby pushing the first electromagnetic drive unit 501 toward the second electromagnetic drive unit 502 .

[0280] Next, the end surface 572 of the fixed core 57 is brought into contact with the yoke bottom portion 646, and the fixed core 57 and the yoke bottom portion 646 are welded to form a welded portion 661. Thus, the assembly of the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 is completed.

[0281] Furthermore, after the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 are assembled, a force of a predetermined magnitude along the radial direction of the tubular member 51 acts on the contact surface 675 .

[0282] In this embodiment, during assembly of the first and second electromagnetic drive units 501 and 502, the second cylindrical portion 512 of the cylindrical member 51 of the first electromagnetic drive unit 501 is press-fitted into the yoke hole 642 of the yoke 641 of the second electromagnetic drive unit 502, ensuring close contact with the outer circumferential wall of the second cylindrical portion 512 and the inner circumferential wall of the yoke hole 642 in the radial direction of the cylindrical member 51. This forms a cylindrical abutment surface 675. Furthermore, after assembly, the yoke 645 of the second electromagnetic drive unit 502 is connected to the fixed core 57 via the weld 661, serving as the "first connection portion," and the yoke 641 of the second electromagnetic drive unit 502 is connected to the cylindrical member 51 via the abutment surface 675, serving as the "second connection portion." This suppresses vibration of the terminal 651 caused by vibrations of the engine 1 and the high-pressure pump 10 during operation. This reduces wear of the terminal 651 and prevents poor conduction.

[0283] Furthermore, in this embodiment, the contact surface 675, which serves as the "second connecting portion," is formed between the inner peripheral wall of the yoke hole 642 of the yoke 641 and the outer peripheral wall of the second tubular portion 512 of the tubular member 51. Therefore, there is no need to modify the yokes 641 and 645 that serve as the magnetic path, and the effect on the attractive force can be suppressed.

[0284] In addition, in this embodiment, by utilizing the abutment surface 675 serving as the "second connecting portion" to fill the cylindrical gap between the yoke hole portion 642 of the yoke 641 and the second cylindrical portion 512 of the cylindrical component 51, that is, by eliminating the above-mentioned gap, it is possible to suppress the intrusion of water, etc. into the interior of the electromagnetic drive portion 500, thereby improving the corrosion resistance of the fixed core 57, etc.

[0285] As described above, in this embodiment, the contact surface 675 serving as the “second connection portion” connects the second electromagnetic drive unit 502 and the tubular member 51 on the pressurizing chamber 200 side of the second electromagnetic drive unit 502 .

[0286] Therefore, similar to the third embodiment, vibration and wear of the terminal 651 can be suppressed, and conduction failure can be suppressed. As a result, malfunction of the suction valve portion 300 can be suppressed, and discharge failure of the high-pressure pump 10 can be suppressed.

[0287] In addition, in the present embodiment, the contact surface 675 serving as the “second connection portion” is a contact surface between the yoke 641 and the tubular member 51 in the radial direction of the tubular member 51 , and is formed in an annular shape.

[0288] This effectively suppresses vibration of the second electromagnetic driver 502 while ensuring the cross-sectional area of the magnetic circuit. Furthermore, it suppresses the intrusion of water, etc., from the outside of the electromagnetic driver 500 into the inside of the electromagnetic driver 500. Consequently, corrosion of the fixed core 57, etc., can be suppressed.

[0289] (Sixth embodiment)

[0290] exist Figure 10 1 shows a part of a high-pressure pump according to a sixth embodiment. The sixth embodiment differs from the third embodiment in the structure of the second connecting portion and the like.

[0291] This embodiment includes a sealing portion 676 as a “second connecting portion”.

[0292] The sealing portion 676 is formed into a ring shape by an elastic member such as resin, that is, a resin material having an elastic modulus of a predetermined value or less.

[0293] The sealing portion 676 connects the second electromagnetic drive unit 502 and the tubular member 51 on the pressurizing chamber 200 side of the second electromagnetic drive unit 502 .

[0294] The sealing portion 676 is provided between the yoke 641 and the tubular member 51 in the axial direction of the tubular member 51 .

[0295] More specifically, the sealing portion 676 is provided between the stepped surface 517 and the surface of the yoke 641 on the pressurized chamber 200 side, on the radially outer side of the second cylindrical portion 512 of the cylindrical member 51 .

[0296] The sealing portion 676 is provided to seal the annular gap between the stepped surface 517 and the surface of the yoke 641 on the pressurized chamber 200 side, radially outwardly of the cylindrical member 51. This maintains a liquid-tight seal between the stepped surface 517 of the cylindrical member 51 and the yoke 641, thereby preventing water and the like from entering the space inside the electromagnetic drive unit 500 from outside the electromagnetic drive unit 500 through the space between the stepped surface 517 and the yoke 641.

[0297] Next, a method of assembling the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 will be described.

[0298] First, the fixed core 57 of the sub-assembly-formed first electromagnetic drive unit 501 is inserted into the inner sides of the yoke hole 642 and the winding drum 61 of the sub-assembly-formed second electromagnetic drive unit 502 .

[0299] Next, the end surface 572 of the stationary core 57 is brought into contact with the yoke bottom portion 646 , and the stationary core 57 and the yoke bottom portion 646 are welded to form a weld portion 661 .

[0300] Next, the annular gap between the stepped surface 517 and the surface of the yoke 641 on the pressurized chamber 200 side is sealed with the sealing portion 676. Specifically, a molten resin material is filled into the gap, cooled, and solidified to form the sealing portion 676. This completes the assembly of the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502.

[0301] Furthermore, after the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 are assembled, the sealing portion 676 has elasticity.

[0302] In this embodiment, when assembling the first and second electromagnetic drive units 501 and 502, a sealing portion 676, serving as a "second connecting portion," is provided between the stepped surface 517 of the cylindrical member 51 of the first electromagnetic drive unit 501 and the yoke 641 of the second electromagnetic drive unit 502, ensuring close contact without any gap in the axial direction of the cylindrical member 51. Furthermore, after assembly, the yoke 645 of the second electromagnetic drive unit 502 is connected to the fixed core 57 via the weld 661, serving as the "first connecting portion," and the yoke 641 of the second electromagnetic drive unit 502 is connected to the cylindrical member 51 via the sealing portion 676, serving as the "second connecting portion." This suppresses vibration of the terminal 651 caused by vibrations from the engine 1 and the high-pressure pump 10 during operation. This reduces wear on the terminal 651 and prevents poor conduction.

[0303] Furthermore, in this embodiment, the sealing portion 676, which serves as the "second connection portion," is provided in the annular gap formed between the yoke 641 and the stepped surface 517 of the tubular member 51. Therefore, it is unnecessary to modify the yokes 641 and 645, which serve as the magnetic path, and the influence on the attractive force can be suppressed.

[0304] In addition, in this embodiment, by using the sealing part 676 as the "second connecting part" to fill the annular gap between the magnetic yoke 641 and the step surface 517 of the cylindrical part 51, it is possible to suppress the intrusion of water, etc. into the interior of the electromagnetic drive part 500 and improve the corrosion resistance of the fixed core 57, etc.

[0305] Furthermore, in this embodiment, the sealing portion 676 serving as the "second connection portion" is provided at a position that can be recognized from the outside. Therefore, it is possible to suppress the occurrence of missing parts and process omissions.

[0306] As described above, in this embodiment, the sealing portion 676 as the “second connecting portion” connects the second electromagnetic driving portion 502 and the tubular member 51 on the pressurizing chamber 200 side of the second electromagnetic driving portion 502 .

[0307] Therefore, similar to the third embodiment, vibration and wear of the terminal 651 can be suppressed, and conduction failure can be suppressed. As a result, malfunction of the suction valve portion 300 can be suppressed, and discharge failure of the high-pressure pump 10 can be suppressed.

[0308] Furthermore, in the present embodiment, the sealing portion 676 as the “second connecting portion” is provided between the yoke 641 as the “first yoke” and the tubular member 51 in the axial direction of the tubular member 51 .

[0309] This effectively suppresses vibration of the second electromagnetic driver 502 while ensuring the cross-sectional area of the magnetic circuit. Furthermore, it suppresses intrusion of water, etc., from outside the electromagnetic driver 500 to the inside of the electromagnetic driver 500. Consequently, corrosion of the fixed core 57, etc., can be suppressed.

[0310] Furthermore, in the present embodiment, the sealing portion 676 serving as the “second connecting portion” is formed in an annular shape by an elastic member.

[0311] Therefore, similar to the third embodiment, vibrations of the second electromagnetic drive unit 502 caused by vibrations of the engine 1 and the high-pressure pump 10 during operation can be more effectively suppressed. Furthermore, the seal 676 maintains a fluid-tight seal between the second electromagnetic drive unit 502 and the tubular member 51, thereby suppressing corrosion of the internal fixed core 57 and other components. Furthermore, the seal 676 reduces the operating noise of the electromagnetic drive unit 500.

[0312] (Seventh embodiment)

[0313] exist Figure 11 1 shows a part of the high-pressure pump of the seventh embodiment. The seventh embodiment differs from the first embodiment in that the pump further includes a "third connecting portion".

[0314] This embodiment further includes an O-ring 691 as a “third connection portion.” The O-ring 691 connects the yoke 641 as a “first yoke” and the base 652 as a “resin portion.”

[0315] More specifically, the O-ring 691 is provided in a seal groove portion 640 formed in the yoke 641. The seal groove portion 640 is formed so as to be annularly recessed from a surface of the yoke 641 on the base portion 652 side.

[0316] The O-ring 691 is formed into an annular shape from an elastic member such as rubber, that is, a resin material having an elastic modulus below a predetermined value. The O-ring 691 is sandwiched between the bottom surface of the seal groove 640 and the surface of the base 652 on the yoke 641 side, and is compressed in the axial direction. This maintains a liquid-tight seal between the seal groove 640 of the yoke 641 and the surface of the base 652 on the yoke 641 side.

[0317] As described above, this embodiment further includes an O-ring 691 as a "third connection portion." The O-ring 691 connects the yoke 641 as the "first yoke" to the base 652 as the "resin portion." In this embodiment, the O-ring 691 is formed of an elastic member.

[0318] In this embodiment, the vibration of the engine 1 causes the upper housing 21 of the high-pressure pump 10 to vibrate, and the electromagnetic drive unit 500 fixed to the upper housing 21 also vibrates. In this embodiment, an O-ring 691, serving as a "third connection," is added to the sealing groove 640 formed at the contact portion between the base 652 of the coil assembly 650 and the yoke 641, ensuring close contact between the two. This reduces the vibration transmitted to the second electromagnetic drive unit 502, which serves as the "coil assembly." This suppresses vibration and wear of the terminal 651, thereby preventing poor conduction. Consequently, it is possible to prevent malfunctions in the suction valve unit 300 and, further, poor discharge from the high-pressure pump 10.

[0319] Furthermore, if a gap is formed at the contact portion between the base 652 of the coil subassembly 650 and the yoke 641, this could create a path for water to infiltrate from the outside into the stationary core 57 and other components within the second electromagnetic drive unit 502. In this embodiment, an O-ring 691, serving as a "third connecting portion," is used to fill the contact portion between the base 652 of the coil subassembly 650 and the yoke 641. This prevents water from intruding and further improves the corrosion resistance of the stationary core 57 and other components.

[0320] (Eighth embodiment)

[0321] exist Figure 12 1 shows a part of the high-pressure pump of the eighth embodiment. The eighth embodiment is different from the seventh embodiment in the arrangement of the "third connection portion" and the like.

[0322] In this embodiment, the yoke 641 does not have the seal groove 640. Instead, the base 652 has a seal groove 653. The seal groove 653 is formed as an annular recess from the surface of the base 652 on the yoke 641 side. An O-ring 691, serving as the "third connection portion," is provided in the seal groove 653.

[0323] The O-ring 691 is compressed in the axial direction between the bottom surface of the seal groove 653 and the surface of the yoke 641 on the base 652 side.

[0324] In this embodiment, as in the seventh embodiment, the O-ring 691, serving as the "third connection portion," can suppress vibration and wear of the terminal 651, thereby preventing poor conduction. Furthermore, the O-ring 691, serving as the "third connection portion," fills the contact area between the base 652 of the coil subassembly 650 and the yoke 641, thereby preventing water from entering.

[0325] Furthermore, in this embodiment, compared with the seventh embodiment, there is no change in the magnetic member such as the seal groove portion 640 formed in the yoke 641 , so the influence of the attractive force on the movable core 55 can be suppressed.

[0326] (Ninth embodiment)

[0327] exist Figure 13 1 shows a part of a high-pressure pump according to a ninth embodiment. The ninth embodiment differs from the seventh embodiment in the structure of the "third connecting portion" and the like.

[0328] In the present embodiment, the sealing groove portion 640 is not formed in the yoke 641. The "third connection portion" is an adhesive 692. The adhesive 692 is formed into a ring-shaped plate by, for example, a resin material having an elastic modulus below a specified value. In the present embodiment, when assembling the second electromagnetic drive unit 502, before the yoke 641 is brought into contact with the yoke tube portion 647 of the yoke 645, the adhesive 692 is applied to the surface of the base 652 on the opposite side of the yoke bottom 646. Next, the yoke 641 is brought into contact with the yoke tube portion 647. At this point, the adhesive 692 has not yet hardened, and the adhesive 692 is in close contact with the surface of the base 652 on the yoke 641 side and the surface of the base 652 on the yoke 641 side.

[0329] Next, the yoke 641 and the yoke tube 647 are welded to form a welded portion 649. This completes the assembly, or subassembly, of the second electromagnetic drive unit 502. After a predetermined period of time, the adhesive 692 hardens due to moisture. In this embodiment, the adhesive 692 is made of a material that remains elastic even after hardening.

[0330] In this embodiment, as in the seventh embodiment, the adhesive 692 serving as the "third connection portion" can suppress vibration and wear of the terminal 651, thereby preventing poor conduction. Furthermore, by filling the contact area between the base 652 of the coil subassembly 650 and the yoke 641 with the adhesive 692 serving as the "third connection portion," water intrusion can be suppressed.

[0331] In addition, in this embodiment, similarly to the eighth embodiment, there is no change in the magnetic member such as the seal groove portion 640 formed in the yoke 641 compared to the seventh embodiment, so the influence of the attractive force on the movable core 55 can be suppressed.

[0332] (10th embodiment)

[0333] exist Figure 14 10 shows a part of the high-pressure pump of the tenth embodiment. The tenth embodiment is different from the seventh embodiment in the structure of the "third connecting portion" and the like.

[0334] In this embodiment, the sealing groove portion 640 is not formed in the yoke 641. The "third connecting portion" is a rubber plate 693. The rubber plate 693 is formed into an annular plate by an elastic member such as rubber, that is, a resin material having an elastic modulus below a specified value. In this embodiment, when assembling the second electromagnetic drive unit 502, before the yoke 641 is brought into contact with the yoke tube portion 647 of the yoke 645, the rubber plate 693 is provided on the surface of the base 652 opposite to the yoke bottom 646. Then, the yoke 641 is brought into contact with the yoke tube portion 647. As a result, the rubber plate 693 is in close contact with the surface of the base 652 on the yoke 641 side and the surface of the yoke 641 on the base 652 side.

[0335] Next, the yoke 641 and the yoke tube portion 647 are welded to form a welded portion 649. Thus, the assembly of the second electromagnetic drive unit 502, that is, the subassembly, is completed.

[0336] In this embodiment, as in the seventh embodiment, the rubber sheet 693 serving as the "third connection portion" can suppress vibration and wear of the terminal 651, thereby preventing poor conduction. Furthermore, by filling the contact area between the base 652 of the coil subassembly 650 and the yoke 641 with the rubber sheet 693 serving as the "third connection portion," water intrusion can be suppressed.

[0337] In addition, in this embodiment, similarly to the ninth embodiment, there is no change in the magnetic member such as the seal groove portion 640 formed in the yoke 641 compared to the seventh embodiment, so the influence of the attractive force on the movable core 55 can be suppressed.

[0338] (11th embodiment)

[0339] exist Figure 15 11 shows a part of the high-pressure pump of the 11th embodiment. The 11th embodiment is different from the 7th embodiment in the structure of the "third connecting portion" and the like.

[0340] In the present embodiment, the sealing groove portion 640 is not formed in the yoke 641. The "third connection portion" is a gasket 694. The gasket 694 is formed into an annular plate by, for example, an elastic member such as a relatively soft metal, that is, a metal material having an elastic modulus below a specified value. In the present embodiment, when assembling the second electromagnetic drive unit 502, before the yoke 641 is brought into contact with the yoke tube portion 647 of the yoke 645, a gasket 694 is provided on the surface of the base 652 on the opposite side of the yoke bottom 646. Next, the yoke 641 is brought into contact with the yoke tube portion 647. As a result, the gasket 694 is in close contact with the surface of the base 652 on the yoke 641 side and the surface of the base 652 on the yoke 641 side.

[0341] Next, the yoke 641 and the yoke tube portion 647 are welded to form a welded portion 649. Thus, the assembly of the second electromagnetic drive unit 502, that is, the subassembly, is completed.

[0342] In this embodiment, as in the seventh embodiment, the washer 694 serving as the "third connection portion" can suppress vibration and wear of the terminal 651, thereby preventing poor conduction. Furthermore, the washer 694 serving as the "third connection portion" fills the contact area between the base 652 of the coil subassembly 650 and the yoke 641, thereby preventing water from entering.

[0343] In addition, in this embodiment, similarly to the ninth embodiment, there is no change in the magnetic member such as the seal groove portion 640 formed in the yoke 641 compared to the seventh embodiment, so the influence of the attractive force on the movable core 55 can be suppressed.

[0344] (12th embodiment)

[0345] exist Figure 16 1 shows a part of the high-pressure pump of the twelfth embodiment. The twelfth embodiment differs from the first embodiment in that it further includes an "additional connecting portion".

[0346] This embodiment further includes a filler 695 as an “additional connection portion.” The filler 695 connects the tubular member 51 and the fixed core 57 to the second electromagnetic drive unit 502 as a “coil assembly.”

[0347] More specifically, the filling material 695 is filled between the second cylindrical portion 512, the third cylindrical portion 513, the magnetic throttling portion 56 and the fixed core 57 of the cylindrical component 51 and the yoke hole portion 642, the base 652, the O-ring 671, the winding reel 61, the O-ring 681 and the yoke bottom 646 of the yoke 641.

[0348] Filling material 695 is formed from an elastic component, such as silicone resin or silicone rubber, primarily composed of high-molecular-weight silicon, that is, a resin material having an elastic modulus below a specified value. As described above, filling material 695 is filled between the second cylindrical portion 512, third cylindrical portion 513, magnetic throttle portion 56, and fixed core 57 of cylindrical member 51, and between the yoke hole 642, base 652, O-ring 671, winding drum 61, O-ring 681, and yoke bottom 646 of yoke 641, thereby ensuring close contact between the components. This maintains a liquid-tight seal between cylindrical member 51, fixed core 57, and second electromagnetic drive unit 502, which serves as the "coil assembly."

[0349] In this embodiment, an injection port 644 is formed in the yoke 645. The injection port 644 is formed so as to penetrate the yoke bottom 646 in the plate thickness direction. The injection port 644 is formed at a position corresponding to the outer edge of the end surface 572 of the fixed core 57 on the side opposite to the pressurized chamber 200.

[0350] In this embodiment, the fixed core 57 and the yoke bottom 646 are welded to form a welded portion 661. After the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502 are assembled, a liquid filler 695 is injected from the injection port 644 to fill the space between the second cylindrical portion 512, the third cylindrical portion 513, the magnetic throttle portion 56, and the fixed core 57 of the cylindrical member 51, and the yoke hole 642, base 652, O-ring 671, spool 61, O-ring 681, and yoke bottom 646 of the yoke 641. After the filler 695 is injected, it hardens after a predetermined period of time. In this embodiment, the filler 695 is formed of a material that has elasticity even after hardening.

[0351] As described above, this embodiment further includes a filler 695 serving as an "additional connection portion." The filler 695 connects the cylindrical member 51 and the fixed core 57 to the second electromagnetic drive unit 502 serving as a "coil assembly." Furthermore, in this embodiment, the filler 695 is formed of an elastic member.

[0352] In the present embodiment, the upper housing 21 of the high-pressure pump 10 vibrates due to the vibration of the engine 1, and the electromagnetic drive unit 500 fixed to the upper housing 21 also vibrates. In the present embodiment, the filler 695 is injected from the injection port 644 formed in the magnetic yoke 645, and the fixed core 57 and a portion of the cylindrical member 51 are covered with the filler 695 so as to be in close contact with the first electromagnetic drive unit 501 and the second electromagnetic drive unit 502. Therefore, the vibration transmitted to the second electromagnetic drive unit 502, which serves as a "coil assembly", can be reduced. As a result, the vibration and wear of the terminal 651 can be suppressed, and poor conduction can be suppressed. Therefore, it is possible to suppress malfunction of the suction valve unit 300 and further suppress poor discharge of the high-pressure pump 10.

[0353] Furthermore, if a gap is formed between the yoke bottom portion 646 of the weld portion 661 and the fixed core 57, or between the cylindrical member 51 and the yoke hole portion 642, this could create a path for water to infiltrate from the outside into the fixed core 57 and the like within the second electromagnetic drive unit 502. In this embodiment, by filling the gaps between the second cylindrical portion 512, the third cylindrical portion 513, the magnetic throttle portion 56, and the fixed core 57 of the cylindrical member 51 and the yoke hole portion 642, the base portion 652, the O-ring 671, the winding drum 61, the O-ring 681, and the yoke bottom portion 646 of the yoke 641 with a filler 695, the intrusion of water can be suppressed, and the corrosion resistance of the fixed core 57 and the like can be further improved.

[0354] (Thirteenth embodiment)

[0355] exist Figure 17 13 shows a part of a high-pressure pump according to a 13th embodiment. The 13th embodiment is different from the first embodiment in the structure of the supply passage portion and the like.

[0356] This embodiment includes a supply passage portion 80. The supply passage portion 80 includes a passage portion main body 81, a supply hole 82, a threaded portion 83, and a threaded portion 84. The passage portion main body 81 is formed into a cylindrical shape with a relatively large wall thickness, for example, by a metal such as stainless steel. The supply hole 82 is formed in a circular shape, connecting the inside and outside of the passage portion main body 81. Four supply holes 82 are formed at equal intervals in the circumferential direction of the passage portion main body 81. The threaded portion 83 is formed as a thread on the outer peripheral wall of one end of the passage portion main body 81. The threaded portion 84 is formed as a thread on the outer peripheral wall of the other end of the passage portion main body 81.

[0357] A cover hole 265 is formed in the cover 26. The cover hole 265 is circular and connects the outside and inside of the cover tube 261. A housing hole 218 is formed in the upper housing 21. The housing hole 218 is formed as a circular recess from the outer peripheral wall of the upper housing 21 at a position corresponding to the cover hole 265. A housing-side threaded portion 219 is formed in the housing hole 218. The housing-side threaded portion 219 is formed as a thread groove on the inner peripheral wall of the housing hole 218.

[0358] The supply passage portion 80 is provided on the upper housing 21 in such a manner that the passage portion main body 81 is inserted through the cover hole portion 265 and the threaded portion 84 is threadedly engaged with the housing-side threaded portion 219 .

[0359] A welding ring 819 is provided on the outside of the cover 26, radially outward of the passage main body 81. The welding ring 819 is formed, for example, from metal into a substantially cylindrical shape. The welding ring 819 is formed so that the end portion on the cover 26 side extends radially outward, and abuts against the periphery of the cover hole portion 265 of the cover outer peripheral wall. The end portion of the welding ring 819 on the cover 26 side is welded to the cover outer peripheral wall over the entire circumferential range, and the portion on the opposite side from the cover 26 is welded to the outer peripheral wall of the passage main body 81 over the entire circumferential range. More specifically, at the end portion of the welding ring 819 on the cover 26 side, the welding ring 819 and the cover 26 are melted by welding and then cooled and solidified to form a weld portion 891, which connects the welding ring 819 to the cover 26 over the entire circumferential range. Furthermore, at the end of the weld ring 819 on the side opposite to the cover 26, the weld ring 819 is connected to the passage body 81 over the entire circumferential range by a weld portion 892 formed by melting the weld ring 819 and the passage body 81 by welding and then cooling and solidifying. This prevents the fuel in the fuel chamber 260 from leaking outside the cover 26 through the gap between the cover hole 265 and the outer peripheral wall of the passage body 81.

[0360] A fuel supply pipe (not shown) is connected to the supply passage 80. The fuel supply pipe is, for example, a steel pipe, and has a threaded groove formed on the inner circumferential wall at the end opposite the fuel pump. The threaded groove at the end of the fuel supply pipe is threadedly engaged with the threaded portion 83 of the passage body 81. The tightening torque for threading the threaded portion 84 of the passage body 81 into the case-side threaded portion 219 is set to be greater than the tightening torque for threading the fuel supply pipe into the threaded portion 83.

[0361] Next, a comparative high-pressure pump will be described.

[0362] like Figure 18 As shown, the comparative embodiment includes a supply passage portion 29. The supply passage portion 29 includes a passage portion body 291 and an annular protrusion 292. The passage portion body 291 is formed into a relatively thin cylindrical shape from a metal such as stainless steel. Here, the wall thickness of the passage portion body 291 is smaller than that of the passage portion body 81 of the present embodiment.

[0363] The annular protrusion 292 is formed to protrude annularly from the outer peripheral wall of the end portion of the passage portion body 291. The supply passage portion 29 is installed on the cover 26 by inserting the end portion of the passage portion body 291 into the cover hole portion 265 and welding the annular protrusion 292 to the outer peripheral wall of the cover tube portion 261.

[0364] A fuel supply pipe (not shown) is connected to the supply passage portion 29. The fuel supply pipe is a relatively flexible pipe made of, for example, resin.

[0365] The comparative embodiment described above has the same structure as the high-pressure pump disclosed in Japanese Patent Application Laid-Open No. 2012-215164. In the comparative embodiment, if stress acts on the weld between the supply passage portion 29 and the cover 26 due to piping pulsation, external piping forces, vibrations from the engine 1, and vibrations during component operation, the weld may be damaged. Damage to the weld could cause fuel in the fuel chamber 260 to leak to the outside.

[0366] An object of the present embodiment is to provide a high-pressure pump capable of suppressing damage to welded portions of components and preventing fuel leakage.

[0367] In this embodiment, the supply passage portion 80 is screwed to the upper housing 21 and welded to the cover 26. Therefore, even if piping pulsation, external piping forces, engine 1 vibrations, or component vibrations occur, stress acting on the welds 891 and 892 can be reduced. This prevents fuel from leaking from the fuel chamber 260 through the welds 891 and 892.

[0368] Furthermore, by providing the threaded portion 83 in the supply passage portion 80 , connection to a fuel supply pipe formed of a steel pipe having a threaded portion can be achieved, thereby reducing the risk of fuel leakage.

[0369] Furthermore, the fuel flowing from the fuel supply pipe into the supply passage 80 flows into the larger fuel chamber 260 via the orifice-shaped supply hole 82. Therefore, the supply hole 82 serves as an orifice, thereby attenuating low-pressure pulsation on the fuel supply pipe side.

[0370] Furthermore, the tightening torque when threading the threaded portion 84 of the passage body 81 into the case-side threaded portion 219 is set to be greater than the tightening torque when threading the fuel supply pipe into the threaded portion 83. This can alleviate stress on the welds 891 and 892 when threading the fuel supply pipe into the threaded portion 83.

[0371] (14th embodiment)

[0372] exist Figure 19 14 shows a portion of a high-pressure pump according to a fourteenth embodiment. The fourteenth embodiment differs from the thirteenth embodiment in the structure of the supply passage portion and the like.

[0373] In this embodiment, the supply passage 80 does not have the threaded portion 84. Furthermore, the upper housing 21 does not have the housing-side threaded portion 219. The supply passage 80 has its passage body 81 inserted through the cover hole 265, and the end of the passage body 291 is press-fitted into the housing hole 218, thereby being mounted on the upper housing 21.

[0374] The structure of this embodiment other than the above-mentioned points is the same as that of the 13th embodiment.

[0375] (Other embodiments)

[0376] In the above embodiment, the yoke 641, serving as the "first yoke," is shown as an example in which the yoke 641 is disposed on the pressurized chamber 200 side relative to the coil 60 in the axial direction of the coil 60. In contrast, in other embodiments, the yoke 641 need not be disposed on the pressurized chamber 200 side relative to the coil 60, as long as it can form a magnetic circuit on the pressurized chamber 200 side relative to the coil 60 in the axial direction of the coil 60.

[0377] Furthermore, in the first to third and sixth embodiments described above, examples are shown in which the "second connecting portion" is formed into an annular shape from an elastic member. In contrast, in other embodiments, the "second connecting portion" may be formed from a material having an elastic modulus greater than a predetermined value. Furthermore, the "second connecting portion" is not limited to an annular shape and may also be formed into a shape with a portion of the circumference cut off.

[0378] In the above embodiment, the suction valve and the electromagnetic drive unit constitute a normally open valve device. However, in other embodiments, the suction valve and the electromagnetic drive unit may constitute a normally closed valve device.

[0379] In addition, in other embodiments, the cover 26 may not be provided. In this case, for example, a supply passage portion may be provided in the upper housing 21 so that the inside of the supply passage portion communicates with the suction passage 216 .

[0380] In addition, in other embodiments, at least two of the cylinder body 23, the upper shell 21, and the lower shell 22 may be formed integrally. In addition, in other embodiments, at least two of the upper shell 21, the seat member 31, and the stopper 35 may be formed integrally.

[0381] Furthermore, in other embodiments, the above-mentioned embodiments may be appropriately combined as long as there are no structural obstacles, for example, the seventh embodiment and the twelfth embodiment may be combined.

[0382] Furthermore, in the above-described embodiment, the "third connecting portion" and the "additional connecting portion" are formed of an elastic member. In contrast, in other embodiments, the "third connecting portion" and the "additional connecting portion" may be formed of a material having an elastic modulus greater than a predetermined value.

[0383] In other embodiments, the high-pressure pump may be applied to internal combustion engines other than gasoline engines, such as diesel engines. Furthermore, the high-pressure pump may be used as a fuel pump that discharges fuel toward devices other than the vehicle engine.

[0384] Thus, the present disclosure is not limited to the above-described embodiment, and can be implemented in various forms without departing from the spirit and scope of the present disclosure.

[0385] The present disclosure has been described based on the embodiments. However, the present disclosure is not limited to the embodiments and configurations. The present disclosure also includes various modifications and variations within the scope of the equivalents. In addition, various combinations and configurations, and further combinations and configurations that include only one element, or more than or less than the above elements, also fall within the scope and spirit of the present disclosure.

Claims

1. A high-pressure pump, have: a pressurizing chamber forming portion for forming a pressurizing chamber for pressurizing the fuel; an intake passage forming portion forming an intake passage through which the fuel sucked into the pressurizing chamber flows; a seat member provided in the suction passage and having a communication passage connecting one surface with the other surface; a valve member disposed on the pressurizing chamber side of the seat member, and capable of allowing or restricting the flow of fuel in the communication passage by moving away from the seat member to open the valve or abutting against the seat member to close the valve; a cylinder member disposed on the seat member on the opposite side of the pressurized chamber; A valve needle is arranged to be able to reciprocate in the axial direction inside the cylindrical member, and one end of the valve needle is linked to the valve member; A movable core is provided at the other end of the valve needle; a fixed core disposed so as to face the movable core in the axial direction of the valve needle; A coil assembly comprising a coil subassembly, a first yoke, and a second yoke, wherein the coil subassembly includes a connector portion, a terminal provided on the connector portion, a cylindrical coil connected to the terminal, and a resin portion covering the terminal and the coil; the first yoke is capable of forming a magnetic circuit on the pressurized chamber side relative to the coil in the axial direction of the coil by supplying current to the coil; and the second yoke is capable of forming a magnetic circuit on the opposite side of the coil from the pressurized chamber in the axial direction of the coil by supplying current to the coil. a first connecting portion connecting the coil assembly to the fixed core on the side of the coil assembly opposite to the pressurizing chamber; and The second connecting portion connects the coil assembly to the cylindrical member on the pressurizing chamber side of the coil assembly. The second connecting portion is formed into a ring or a cylinder by an elastic member. The second connection portion is provided between the resin portion and the tubular member so as to be elastically deformable in a radial direction of the tubular member.

2. The high-pressure pump according to claim 1, The second connection portion is provided between an end portion of the resin portion on the tubular member side and an end portion of the tubular member on the resin portion side.

3. The high-pressure pump according to claim 2, The resin portion has a protrusion protruding in an annular shape toward the pressurizing chamber side. The cylindrical member includes a second cylindrical portion and a third cylindrical portion, the third cylindrical portion is connected to the second cylindrical portion, and the outer diameter of the third cylindrical portion is smaller than the outer diameter of the second cylindrical portion. The second connecting portion is provided between the protruding portion and the third cylindrical portion.

4. The high-pressure pump according to any one of claims 1 to 3, The cylindrical member and the first yoke form a magnetic path portion by a portion of the cylindrical member and a portion of the first yoke adjacent to each other in the radial direction of the cylindrical member. The second connection portion is provided on the coil side relative to the magnetic path portion.

5. The high-pressure pump according to claim 4, The first yoke has an opposing portion that opposes the coil subassembly in the axial direction of the coil. The second connection portion is provided on the coil side relative to the opposing portion.

6. The high-pressure pump according to any one of claims 1 to 3, A third connecting portion connecting the first yoke and the resin portion is further provided.

7. The high-pressure pump according to claim 6, The third connecting portion is formed of an elastic member.

8. The high-pressure pump according to any one of claims 1 to 3, An additional connection portion is further provided for connecting the cylindrical member and the fixed core to the coil assembly.

9. The high-pressure pump according to claim 8, The additional connection portion is formed of an elastic member.

10. A high-pressure pump, have: a pressurizing chamber forming portion for forming a pressurizing chamber for pressurizing the fuel; an intake passage forming portion forming an intake passage through which the fuel sucked into the pressurizing chamber flows; a seat member provided in the suction passage and having a communication passage connecting one surface with the other surface; a valve member disposed on the pressurizing chamber side of the seat member, and capable of allowing or restricting the flow of fuel in the communication passage by moving away from the seat member to open the valve or abutting against the seat member to close the valve; a cylinder member disposed on the seat member on the opposite side of the pressurized chamber; A valve needle is arranged to be able to reciprocate in the axial direction inside the cylindrical member, and one end of the valve needle is linked to the valve member; A movable core is provided at the other end of the valve needle; a fixed core disposed so as to face the movable core in the axial direction of the valve needle; A coil assembly comprising a coil subassembly, a first yoke, and a second yoke, wherein the coil subassembly includes a connector portion, a terminal provided on the connector portion, a cylindrical coil connected to the terminal, and a resin portion covering the terminal and the coil; the first yoke is capable of forming a magnetic circuit on the pressurized chamber side relative to the coil in the axial direction of the coil by supplying current to the coil; and the second yoke is capable of forming a magnetic circuit on the opposite side of the coil from the pressurized chamber in the axial direction of the coil by supplying current to the coil. a first connecting portion connecting the coil assembly to the fixed core on the side of the coil assembly opposite to the pressurizing chamber; and The second connecting portion connects the coil assembly to the cylindrical member on the pressurizing chamber side of the coil assembly. The second connecting portion is formed into a ring shape by an elastic member. The second connection portion is provided between the first yoke and the tubular member so as to be elastically deformable in the axial direction of the tubular member.

11. The high-pressure pump according to claim 10, The first yoke is formed in a ring shape, The cylindrical member has an annular step surface. The second connection portion is provided between a surface of the first yoke on the pressure chamber side and the stepped surface.

12. The high-pressure pump according to claim 10 or 11, A third connecting portion connecting the first yoke and the resin portion is further provided.

13. The high-pressure pump according to claim 12, The third connecting portion is formed of an elastic member.

14. The high-pressure pump according to claim 10 or 11, An additional connection portion is further provided for connecting the cylindrical member and the fixed core to the coil assembly.

15. The high-pressure pump according to claim 14, The additional connection portion is formed of an elastic member.

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