FUEL INJECTION VALVE

Abstract

A fuel injector comprises a needle (20) (a valve body), a fixed core (13), a movable core (30), a first spring element (SP1) (a spring element), and a cup (50) (an element for transmitting the valve closing force). The first spring element is elastically deformed according to the valve opening process of the needle and exerts an elastic force to close the valve. The cup contacts a valve closing contact surface of the needle and transmits the elastic closing force to the needle. At the beginning of a movement of the movable core together with the cup over a predetermined distance, the cup is in contact with the valve closing contact surface, and the needle has a supply flow channel (20e) through which fuel is supplied to the valve closing contact surface of the valve body, which is in contact with the cup.As a result, the variation in the fuel injection quantity can be reduced while simultaneously adopting a core boost structure.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on and incorporates the disclosures of Japanese Patent Application No. 2017-189886 filed on Sep. 29, 2017 and Japanese Patent Application No. 2018-169995 filed on Sep. 11, 2018. technical field

[0002] The present disclosure relates to a fuel injector that injects fuel. BACKGROUND

[0003] A conventional fuel injection valve includes a fixed core that generates a magnetic attraction force when a coil is energized, a movable core that is attracted and moved by the fixed core, and a valve body that is actuated by the movable core to open the valve so that Fuel is ejected from a nozzle opening. In recent years, fuel pressure becomes high, and a valve closing force that presses the valve body tends to increase. Therefore, a large valve opening force is required to open the valve against the large valve closing force.

[0004] As a countermeasure to the above points, a core boosting structure described below is disclosed in Patent Literature 1 . That is, for the valve opening operation of the valve body, first, the movement of the movable core is started in a state where the movable core is not engaged with the valve body. And thereafter, when the movable core is moved by a predetermined distance, the movable core is brought into contact with the valve body to start the valve opening operation.

[0005] According to the core boosting structure described above, since the movable core is not yet engaged with the valve body immediately after the start of energization, the movable core, which is not subjected to the force of fuel pressure, can increase the moving speed of the movable by an initially small magnetomotive force increase core quickly. Since the movable core then comes into contact with the valve body and starts the valve opening operation when the moving speed becomes sufficiently high, i.e. when the movable core is moved by the predetermined distance, the valve opening operation can be performed by using a collision force of the movable core in addition to a magnetic attraction force be performed. Therefore, the valve opening operation of the valve body can be performed even when the fuel pressure is high. In addition, the magnetic attraction force required to open the valve can be reduced. PRIOR ART PATENT LITERATURE

[0006] Patent Literature 1: JP 2013-104340 A SUMMARY OF THE INVENTION

[0007] However, in the core boosting structure described above, the moving core moves in two stages: a movement from the start of energization to contact with the valve body; and subsequent movement while maintaining contact with the valve body. For this reason, there is a new problem that a change in the period of time from the start of energization to the start of valve opening is directly related to a change in the amount of fuel injected at one valve opening. In addition, it is important to reduce not only the time from the start of energization to the valve opening but also the time from the end of the energization to the valve closing.

[0008] The object of the present disclosure is to provide a fuel injection valve that uses a core boosting structure while reducing a variation in fuel injection amount.

[0009] According to an aspect of the present disclosure, a fuel injection valve includes: a valve body that opens and closes a nozzle hole for injecting a fuel; a fixed core that generates a magnetic attraction force when a coil is energized; a movable core that is attracted and moved by the fixed core, the movable core coming into contact with a valve opening contact surface of the valve body when the movable core is moved by a predetermined distance to cause the valve body to start a valve opening operation; a spring member which is elastically deformed by the valve opening operation of the valve body and exerts a valve closing elastic force which causes the valve body to perform a valve closing operation; and a valve closing force transmission element which transmits the valve closing elastic force to the valve body by contacting a valve closing contact surface of the valve body . touched. The valve-closing force transmission member is in contact with the valve-closing contact surface at the start of movement of the movable core for a predetermined distance together with the valve-closing force transmission member. The valve-closing force transmission member or the valve body has a supply flow passage that supplies the fuel to the valve-closing contact surface that is in a state of contacting the valve-closing force transmission member.

[0010] In a core boosting structure in which the valve-closing force transmission member is in contact with the valve body at the start of movement of the movable core a predetermined distance together with the valve-closing force transmission member because the coil starts to be energized, there are the following problems. When the valve-closing force transmission member and the valve body are in close contact with each other, a phenomenon (i.e., a binding phenomenon) may occur in which the valve-closing force transmission member is hardly separated from the valve body. As a result, the moving core may be delayed in starting to move a predetermined distance and the opening performance of the valve may deteriorate.

[0011] In order to cope with the above problems, the present embodiment has the supply flow path for supplying the fuel to the contact surface of the valve closer which is in contact with the valve closing force transmission member. When the movable core starts to move by a predetermined distance, the fuel is supplied to the valve-closing contact surface, which is in contact with the valve-closing force transmission member. In this way, the valve closing force transmission member can be prevented from being in close contact with the valve body and being difficult to be separated from the valve body. The delay in starting the movement of the movable core over a predetermined distance due to the above-mentioned tight contact force can be reduced. As a result, the valve opening response time from the start of energization of the coil to the start of opening of the valve body can be shortened, thereby improving the valve opening performance. In addition, the variation in the valve opening timing due to interference of the movement of the moving core can be reduced, and the variation in the fuel injection amount can be reduced. character list figure 1 is a sectional view of a fuel injection valve according to a first embodiment. figure 2 is an enlarged view of a nozzle opening portion of FIG figure 1. figure 3 is an enlarged view of a movable core portion of FIG figure 1. figure 4 is a schematic representation of the operation of the fuel injection valve according to the first embodiment, wherein ( a ) in figure 4 a closed state of the valve, ( b ) in figure 4 a state in which a movable core moving by a magnetic attraction force collides with a valve body, and ( c ) in figure4 shows a state in which the movable core, which further moves by the magnetic attraction force, collides with a guide member. figure 5 is a timing chart showing the operation of the fuel injection valve according to the first embodiment, where ( a ) in figure 5 a change in drive pulse, ( b ) in figure 5 a change of a driving current, ( c ) in figure 5 a change of a magnetic attraction force and ( d ) in figure 5 shows the behavior of a moving section. figure 6 is a flowchart showing an assembling process of the movable portion according to the first embodiment. figure 7 is an exploded view of a movable portion according to the first embodiment. figure 8 is a sectional view of the movable portion showing the state of pressing a cup against a needle during the assembling process of FIG figure 6 shows. figure 9 is a sectional view of the movable portion showing a state in which a first press fitting of the figure 6 is completed. figure 10 is a perspective view of FIG figure 9. figure 11 is a stress-strain diagram of the needle and a sleeve according to the first embodiment. figure 12 is a sectional view showing the shape of a communication groove provided in the movable core according to the first embodiment. figure 13 is a plan view of the in figure 12 viewed from a side opposite to a nozzle opening. figure 14 is a sectional view taken along a line XIV-XIV from figure 13. figure 15 is a sectional view showing the modification B1 in relation to figure 12 shows. figure 16 is a plan view of the FIG figure 15 as viewed from the side opposite to the nozzle opening. figure 17 is a sectional view of the modification B2 in relation to figure 12. figure 18 is a plan view of the in figure 17 as viewed from the side opposite to the nozzle opening. figure 19 is a sectional view showing the modification B3 in relation to figure 12 shows. figure 20 is a plan view of the in figure 19 as viewed from the side opposite to the nozzle opening. figure 21 is a sectional view showing the modification B4 in relation to figure 12 shows. figure 22 is a sectional view showing the modification B5 in relation to figure 12 shows. figure 23 is a sectional view showing the modification B6 in relation to figure 12 shows. figure 24 is a sectional view showing the shape of a supply flow channel provided in a needle according to the first embodiment. figure 25 is a plan view of the FIG figure 24 seen from the side opposite the nozzle orifice. figure 26 is a sectional view taken along a line XXVI-XXVI from figure 25 figure 27 is a sectional view showing the modification C1 compared to figure 26 shows. figure 28 is a sectional view showing the modification C2 in relation to figure 26 shows. figure 29 is a sectional view showing the modification C3 in relation to figure 26 shows. figure 30 is a plan view of the needle from the side opposite to the nozzle opening showing the modification C4 in relation to figure 25 shows. figure 31 is a plan view of the needle from the side opposite to the nozzle opening showing the modification C5 in relation to figure 25 shows. figure 32 is a sectional view through the figure 31, and ( a ) is a cut along a line XXXIIa-XXXIIa and ( b ) is a cut along a line XXXIIb-XXXIIb . figure 33 is a sectional view of the modification C6 in relation to figure 24 figure 34 is a sectional view showing the modification C7 in relation to figure 24 shows. figure 35 is a plan view of an in figure 34 seen from the nozzle opening side. figure 36 is a cross-sectional view showing the shape of a recessed surface provided in a guide member at the time of full raising according to the first embodiment. figure 37 is a sectional view showing the shape of the recessed surface provided in the guide member at the time of closing the valve according to the first embodiment. figure 38 is a sectional view showing a gap between a movable core and a holder at the time of closing the valve according to the first embodiment. figure 39 is a plan view of the in figure 38 seen from the side opposite the nozzle orifice. figure 40 is a sectional view showing the modification E1 in relation to figure 38 shows. figure 41 is a sectional view showing the modification E2 in relation to figure 38 shows. figure 42 is a sectional view showing the modification E3 in relation to figure 38 shows. figure 43 is a sectional view of a fuel injection valve according to a second embodiment. figure 44 is a sectional view of a fuel injection valve according to a third embodiment. DETAILED DESCRIPTION

[0012] Several embodiments for implementing the present disclosure are described below with reference to drawings / figures. In the respective embodiments, a part corresponding to a subject described in a previous embodiment may be assigned the same reference numeral, and redundant description for the part may be omitted. In one embodiment, when only a part of a configuration is described, another previous embodiment may be applied to the other parts of the configuration. The parts can be combined even if it is not specifically described that the parts can be combined. The embodiments can be partially combined even if it is not expressly described that the embodiments can be combined, provided that the combination is harmless. (First embodiment)

[0013] a in figure 1 shown fuel injector 1 is fixed to a cylinder head or a cylinder block of an internal combustion engine mounted on a vehicle. Gasoline fuel accumulated in a vehicle-mounted fuel tank is pressurized by a fuel pump (not shown) and a fuel injector 1 supplied, and the supplied high-pressure fuel is directly from the in the fuel injection valve 1 provided nozzle openings 11a injected into a combustion chamber of the internal combustion engine.

[0014] The fuel injector 1 includes a nozzle opening body 11 , a main body 12 , a solid core 13 , a nonmagnetic element 14 , a coil 17 , a support element 18 or a bearing element 18 , a first spring element SP1 , a second spring element SP2 , a needle 20 , a moving core 30 , a sleeve 40 , a cup 50 , a guiding element 60 and similar. The nozzle orifice body 11 , the main body 12 , the solid core 13 , the support element 18 or the bearing element 18 , the needle 20 , the moving core 30 , the sleeve 40 , the cup 50 and the guiding element 60 consist of metal or are made of metal.

[0015] As in figure 2, the nozzle opening body has 11 the multi-nozzle holes 11a for injecting a fuel. The needle 20 located inside the nozzle orifice body 11 , and a flow channel 11b , which allows high-pressure fuel to flow to the nozzle openings 11a to flow is between an outer peripheral surface of the needle 20 and an inner peripheral surface of the nozzle opening body 11 intended. A body-side seat 11s , on the one on the needle 20s formed valve body side seat 20s is separated and on the inner peripheral surface of the nozzle opening body 11 sits. The valve body side seat 20s and the body-side seat 11s are shaped in such a way that they form a ring around an axis line C the needle 20 extend. If the needle 20 is detached and on the bodyside seat 11s sits, the flow channel 11b opened and closed and the nozzle openings 11a opened and closed.

[0016] The main body 12 and the non-magnetic element 14 are cylindrical in shape. A cylindrical end portion of the main body 12 , moving in relation to the main body 12 closer to the nozzle openings 11a located (on a nozzle opening side) is fixed to the nozzle opening body by welding 11 fastened. A cylindrical end portion of the main body 12 on one of the nozzle openings 11a opposite side in relation to the main body 12 (on a side opposite to the nozzle openings) is attached to a cylindrical end portion of the non-magnetic member 14 fixed by welding. A cylindrical end portion of the non-magnetic member 14 on the side opposite the nozzle opening is fixed core by welding 13 fastened.

[0017] A mother element 15 is attached to a threaded section 13N of the solid core 13 fixed in a state where it is fitted with a locking portion 12c of the main body 12 is locked. An axial force generated by the attachment creates a surface pressure that the nut element 15 , the main body 12 , the nonmagnetic element 14 and the solid core 13 towards the axis line C (in the vertical direction in figure 1) press against each other. Instead of generating such a surface pressure using fastening screws, the surface pressure can also be generated by pressing in or a press fit.

[0018] The main body 12 consists of a magnetic material such as stainless steel and has a flow channel 12b to the fuel in the nozzle openings 11a to let flow inside. In the flow channel 12b is the needle 20 towards the axis line C movable housed. The main body 12 and the non-magnetic element 14 correspond to a "holder" with a movable chamber 12a which is filled with the fuel. A moving section M (please refer figure 9 and figure 10) which is an assembly in which the needle 20 , the moving core 30 , the second spring element SP2 , the sleeve 40 and the mug 50 are joined together is movable in the movable chamber 12a accommodated. a in figure 9 shown gap L1a gives the size of a gap between a valve closing contact surface 21b and a valve closing force transmission contact surface 52c towards the axis line C on. The size of the gap L1a corresponds to the size of a column L1 , which is in a column ( a ) from figure 4 is shown.

[0019] The river channel 12b is shaped to mate with a downstream side of the movable chamber 12a communicates and moves in the direction of the axis line C extends. A center line of the river channel 12b and the moving chamber12a coincides with a cylindrical center line (axis line C ) of the main body 12 together. A nozzle opening side portion of the needle 20 is sliding from an inner wall surface 11c of the nozzle orifice body 11 and a section of the needle 20 on a side opposite to the nozzle openings slidably from an inner wall surface 51b of the mug 50 worn (see figure 8 and figure 12). Two positions of an upstream end portion and a downstream end portion of the needle 20 are slidably mounted in this way, reducing the movement of the needle 20 is limited in the radial direction and the inclination of the needle 20 relative to the axis line C of the main body 12 is limited.

[0020] The needle 20 corresponds to a "valve body" that contains the nozzle openings 11a opens and closes and is made of a magnetic material such as stainless steel and has a shape that varies in the direction of the axis line C extends. The valve body side seat described above 20s is on a downstream face of the needle 20 educated. When the needle 20 to the downstream side in the direction of the axis line C moved (valve closing process), the seat on the valve body side is seated 20s on the body side seat 11s on to the river channel 11b and the nozzle openings 11a to close. When the needle 20 to the upstream side in the direction of the axis line C moves (valve opening process), the valve body side seat 20s from the body-side seat 11s separated to the river channel 11b and the nozzle openings 11a to open.

[0021] The needle 20 has an internal passage 20a and side openings 20b , so that the fuel through the nozzle openings 11a can flow (see figure 3). The multiple side openings 20b are provided in the circumferential direction. The multiple side openings 20b are provided at regular intervals in the circumferential direction. The inner passage 20a has a shape that extends in the direction of the axis line C the needle 20 extends. An inflow port is at an upstream end of the internal passage 20a provided, and the side openings or holes 20b are with a downstream end of the internal passage 20a tied together. The side openings 20b extend in a direction that is the direction of the axis line C crosses, and stand with the moving board 12a in connection.

[0022] As in figure 7, the needle has 20 a contact section 21 , a core sliding section 22 , a press-fit portion 23 , an outflow section 24 , a first large diameter section 25 , a first small diameter section 26 , a second large-diameter section 27 , a second small-diameter section 28 and a nozzle opening side bearing portion 29 in a specified order from the opposite side (upper end side) to the lower end side of the valve body side seat 20s . The contact section 21 has the valve closing contact surface 21b , which is the contact surface 52c of the mug 50 touched to transmit the valve closing force.

[0023] The cup 50 becomes slidable with the contact portion 21 assembled together, and an outer peripheral surface of the contact portion 21 slides with an inner peripheral surface of the cup 50 . The moving core 30 is sliding with the core sliding section 22 connected, and an outer peripheral surface of the core sliding portion 22 slides with an inner peripheral surface of the movable core 30 . A pod 40 is in the press-fit section 23 pressed in or press fitted. The side openings20b are in the outflow section 24 intended.

[0024] An outside diameter D1 of the contact section 21 is larger than an outside diameter D2 of the core sliding section 22 , the outside diameter D2 of the core sliding section 22 is larger than an outside diameter D3 of the press-fit section 23 and the outside diameter D3 of the press-fit section 23 is larger than an outer diameter of the outflow portion 24 . A connector 22a between the core sliding section 22 and the press-fit section 23 and a connecting portion 23a between the press-fit section 23 and the outflow section 24 are each formed obliquely. The diameter of an inner peripheral surface 41a the sleeve 40 in a state before press-fitting is set to be smaller than the outer diameter D3 of the press-fit section 23 is, and press-fitting can be performed.

[0025] The outside diameters of the first large diameter section 25 and the second large diameter section 27 are larger than the outside diameters of the first small-diameter section 26 and the second small diameter section 28 . The weight reduction is due to the small diameter first section 26 and the second small diameter section 28 reached. The first large diameter section 25 and the second large diameter section 27 serve as a storage or storage section when the needle 20 is cut. The second section 28 small-diameter functions as the outlet portion, so that a cutting tool cuts the nozzle opening-side bearing portion 29 not disabled. The nozzle opening side bearing section 29 becomes sliding from the inner wall surface 11c of the nozzle orifice body 11 supported.

[0026] The cup 50 has a circular cup portion 52 with a circular plate shape and a cylindrical section 51 with a cylindrical shape. The circular plate section 52 has a through hole 52a on that in the direction of the axis line C runs. A face of the circular plate section 52 on a side opposite the nozzle orifices acts as a spring contact surface 52b , which is the first spring element SP1 touched. A face of the circular plate section 52 on the side of the nozzle opening acts as a contact surface 52c to transmit the valve closing force that the needle 20 touches and transmits a first elastic force (an elastic force for closing the valve or an elastic valve closing force). The circular plate section 52 corresponds to a "valve body transmission portion" that includes the first spring member SP1 and the needle 20 touched to the first elastic force on the needle 20 transferred to. The cylindrical section 51 has a cylindrical shape extending from an outer peripheral end of the circular plate portion 52 extends to the side of the nozzle opening. A nozzle opening side end surface of the cylindrical portion 51 acts as a core contact endface 51a , which is the moving core 30 touched. The inner wall surface 51b of the cylindrical section 51 slides with the outer peripheral surface of the contact portion 21 the needle 20 .

[0027] The Solid Core 13 consists of a magnetic material such as stainless steel and has a flow channel 13a to the fuel through the nozzle openings 11a to let flow. The river channel 13a communicates with the inner passage 20a , inside the needle 20 (please refer figure 3) and an upstream side of the moving chamber 12a is provided and extends in the direction of the axis lineC . The river channel 13a takes the lead 60 , the first spring element SP1 and the support element 18 on.

[0028] The support element 18 has a cylindrical shape and is fitted into an inner wall surface of the fixed core 13 press fitted. The first spring element SP1 is a coil spring mounted on the downstream side of the support member 18 is arranged and moving in the direction of the axis line C elastically deformed. An upstream face of the first spring element SP1 is through the support element 18 and a downstream face of the first spring member SP1 is through the cup 50 supported. A force created by the elastic deformation of the first spring element SP1 is generated (a first elastic force), pushes the cup 50 to the downstream side. The degree of interference fit or interference fit of the support member 18 towards the axis line C is adjusted to give a magnitude of the elastic force for the stress on the cup 50 (a first setting load).

[0029] As in figure 3 shown, has the guide member 60 A cylindrical shape made from a magnetic material like stainless steel and cut into one section 13c press-fitted with enlarged diameter, which is fixed in the core 13 is formed. The section 13c with an increased diameter has a shape in which the flow channel 13a is increased in the radial direction. The guiding element 60 has a circular plate section 62 with a circular plate shape and a cylindrical section 61 with a cylindrical shape. The circular plate section 62 has a through hole 62a on that in the direction of the axis line C runs. A face of the circular plate section 62 on the side opposite to the nozzle openings touches an inner wall surface of the section 13c with increased diameter. The cylindrical section 61 has a cylindrical shape extending from the outer peripheral end of the circular plate portion 62 extends to the side of the nozzle opening. A nozzle opening side end surface of the cylindrical portion 61 acts as a stopper contact end face 61a , which is the moving core 30 touched. An inner wall surface of the cylindrical portion 51 forms a sliding surface 61b , which with an outer peripheral surface 51d of the cylindrical part 51 of the mug 50 slides (see figure 12).

[0030] In short, the guiding element 60 has a guiding function, in which the outer peripheral surface of the cup 50 towards the axis line C slides, and a stop(er) function where the moving core 30 , extending in the direction of the axis line C moved, touched and the moving core 30 is prevented from moving to the side opposite to the nozzle openings. In other words, the guiding element 60 corresponds to a "stopper element" that controls the moving core 30 touches and the moving core 30 from protruding from the nozzle openings 11a to remove.

[0031] A resin element 16 is on an outer peripheral surface of the fixed core 13 intended. The resin element 16 has a connector housing 16a on, and a connector 16b is in the connector housing 16a accommodated. The connection 16b is electric with the coil 17 tied together. An external connector (not shown) is attached to the connector housing 16a connected, and the coil 17 is about the port 16b supplied with electrical energy. The sink 17 is around a bobbin 17a is wound, which has an electrical insulating property to form a cylindrical shape, and is on a radially outer side of the fixed core 13 , the non-magnetic element 14 and the moving core 30arranged. The Solid Core 13 , the mother element 15 , the main body 12 and the moving core 30 form a magnetic circuit around a magnetic flux generated with a power supply (excitation) to the coil 17 to direct (see dashed arrow in figure 3).

[0032] As in figure 3 is the moving core 30 in relation to the solid core 13 located on the nozzle opening side and in the movable chamber 12a in a direction of the axis line C moveable state housed. The moving core 30 has an outer core 31 and an inner core 32 . The Outer Core 31 has a cylindrical shape made of a magnetic material such as stainless steel, and the inner core 32 has a cylindrical shape made of a non-magnetic material such as stainless steel that has a magnetic property. The Outer Core 31 is in an outer peripheral surface of the inner core 32 pressed in.

[0033] The needle 20 is in a cylindrical inner portion of the inner core 32 introduced. The inner core 32 becomes so to the needle 20 mounted that he is relative to the needle 20 in the axis line C is movable. A gap (inner gap) between an inner peripheral surface of the inner core 32 and an outer peripheral surface of the needle 20 is set to be smaller than a gap (outer gap) between an outer peripheral surface of the outer core 31 and an inner peripheral surface of the main body 12 . These gaps or gaps are set so that the outer core 31 the main body 12 not touched while the inner core 32 the needle 20 touched.

[0034] The inner core 32 touches the guide element 60 as a stopper element, the cup 50 and the needle 20 . For this reason, a material that has a higher degree of hardness than that of the outer core 31 , for the inner core 32 used. The Outer Core 31 has a solid core 13 opposite or facing movable core surface 31c on, and between the moving core surface 31c and the solid core 13 there is a gap. Therefore, in a state where a magnetic flux acts by energizing the coil 17 flows as described above, a magnetic attraction from the solid core 13 is attracted to the outer core 31 , by providing the gap.

[0035] The sleeve 40 corresponds to a "solid element" that is inserted into the needle 20 is pressed or press-fitted into it. The sleeve 40 consists of a cylindrical metal with a through hole or a through opening 40a (please refer figure 7) and has a cylindrical insertion section 41 , a connecting section 42 and a storage section 43 on. The cylindrical male section 41 has a cylindrical shape and is fitted into the press-fitting section 23 the needle 20 press fitted. The connection section 42 has a cylindrical shape in which the cylindrical fitting portion 41 is enlarged in the radial direction and connects the cylindrical insertion portion 41 and the storage section 43 . The connection section 42 leads the second spring element SP2 , to a positional deviation of the second spring element SP2 to reduce in the radial direction. The storage section 43 has an annular flange shape extending from the nozzle opening side end portion of the connecting portion 42 extends to the radially outer side. In other words, the storage section 43 has a plate shape extending from the nozzle opening side end portion of the connection portion 42 extending toward the radially outer side, and a ring shape extending around the axis line C extends. A face of the storage section 43on the side opposite the nozzle opening acts as a support surface 43a for supporting the nozzle opening side end face of the second spring member SP2 .

[0036] The second spring element SP2 is a coil spring mounted on the side opposite to the nozzle openings with respect to the bearing portion 43 is arranged and in the direction of the axis line C is elastically deformed. An end surface of the second spring element SP2 on the side opposite to the nozzle opening is controlled by the movable core 30 , more precisely through the outer core 31 , supported. An end face of the second spring element on the nozzle opening side SP2 is through the storage section 43 supported. By the elastic deformation of the second spring element SP2 generated force (the second elastic force) pushes the outer core 31 towards the side opposite to the nozzle openings. With the adjustment of the degree of press-fitting of the cylindrical fitting portion 41 towards the axis line C becomes a magnitude of the second elastic force for pushing the movable core 30 (a second set load) is set at the time of valve closing. The second set load related to the second spring element SP2 is smaller than the first set load based on the first spring element SP1 . In addition, not only when the valve is closed, but also when the moving core 30 in another situation, the magnitude of the second elastic force can be set as the second adjustment load adjusted by the degree of press-fitting. <Description of operation or operation>

[0037] Next is how the fuel injector works 1 based on figure 4 and figure 5 described.

[0038] As in a column ( a ) from figure 4 is shown in a state where the coil 17 is de-energized, no magnetic attraction force is generated, so that the magnetic attraction force driven toward the valve opening side is not applied to the moving core 30 works. The cup 50 , which is caused by the first elastic force by the first spring element SP1 is generated is pressed toward the valve-closing side touches the valve-closing contact surface 21b the needle 20 (please refer figure 3) and the inner cores 32 , to transmit the first elastic force.

[0039] The moving core 30 is by the first elastic force of the first spring member SP1 , by the mug 50 is transmitted, urged to the valve closing side, and the moving core 30 is by the second elastic force of the second spring member SP2 pushed towards the valve opening side. Since the first elastic force is larger than the second elastic force, the movable core becomes 30 through the cup 50 pushed and moved towards the nozzle openings (lifted down). The needle 20 is caused by the first elastic force exerted by the cup 50 is transmitted, pushed to the valve closing side and through the cup 50 pushed to the nozzle opening side (lift down), i.e. on the body-side seat 11s set to close the valve. In the closed state of the valve, there is a gap between the valve opening contact surface 21a (please refer figure 3) the needle 20 and the moving core 30 (the inner core 32 ) provided, and a length of the gap in the direction of the axis line C in the closed state of the valve is called a gap L1 designated.

[0040] As in a column ( b ) from figure 4 acts in a state immediately after switching the energization of the coil 17 from OFF to ON, the magnetic attraction force on the moving core pushed toward the valve opening side 30 , and the moving core 30 starts to move towards the valve opening side. If then the moving core 30 moves while the mug 50is pushed up, and the amount of movement the gap L1 reached, the inner core collides 32 with the valve opening contact surface 21a the needle 20 . At the time of collision, there is a gap between the guide member 60 and the inner core 32 provided, and the length of the gap in the direction of the axis line C is called a hub L2 designated.

[0041] Because the elastic force of the first spring element SP1 only at the time of collision on the needle 20 acts, the collision speed of the moving core can 30 be increased accordingly. Since such a collision force adds to the magnetic attraction force and as the valve opening force of the needle 20 used, the needle can 20 be operated so that the valve is opened even with a high-pressure fuel, while preventing an increase in the magnetic attraction force required to open the valve. The elastic force of the first spring element SP1 acts on the needle 20 towards the valve closing side in the column ( a ) shown, but does not affect the needle 20 in the in the column ( b ) shown state. For this reason, suppression of the increase in the magnetic attraction force required to open the valve can be further promoted.

[0042] After the collision, the moving core moves 30 by the magnetic attraction force further, and when the amount of movement after the collision the elevator L2 reached, the inner core collides 32 with the guiding element 60 and stops the movement, as in the column ( c ) from figure 4 shown. A separation distance between the body-side seat 11s and the valve body side seat 20s towards the axis line C at the moment of stopping the movement corresponds to a full stroke of the needle 20 and corresponds to the stroke described above L2 .

[0043] If the above operation with reference to figure 5 is described in detail, first begins when excitation at a time t1 is switched on, as shown in the column ( a ) from figure 5 shown, a through the coil 17 flowing drive current to increase (see column ( b )), and the magnetic attraction force begins to increase with the increase in drive current (see column ( c )). When a value obtained by subtracting the second elastic force from the first elastic force (valve-closing elastic force) as actual valve-closing elasticity F0 is defined, the moving core begins 30 themselves at a time t2 to move to the valve opening side when the magnetic attraction force on the actual valve closing elasticity F0 increases. Before the drive current reaches a peak, the moving core catches 30 to move. A boost voltage obtained by boosting a battery voltage is applied to the coil 17 applied until the drive current reaches the peak value, and the battery voltage is applied to the coil 17 applied after the drive current has reached the peak value.

[0044] After that, at a time t3 , when the amount of movement of the movable core 30 the gap L1 reached, the movable core collides 30 with the needle 20 , and the needle 20 begins the opening process of the valve (see column ( d )). As a result, the fuel comes out of the nozzle openings 11a injected. After that, the moving core lifts 30 the needle 20 against the elastic closing force of the valve, and at a time t4 , if the moving core 30 with the guiding element 60 collides, reaches the stroke of the needle 20 the full stroke (stroke L2 ). A on a vertical axis of the column ( d ) shown origin shows a collision position between the moving core 30 and the needle 20 at the time t3 on.

[0045] After that, the needle becomes a full lift state by the magnetic attraction force 20 maintained and fuel injection continues. After that, when the excitement at a time t5 is turned off, the magnetic attraction force also decreases with a decrease in drive current. At a time t6 , when the magnetic attraction force is the actual valve-closing elastic force or the valve-closing elastic force F0 reached, the moving core begins 30 himself together with the mug 50 to move to the valve closing side. The needle 20 is caused by a pressure between the needle 20 and the mug 50 filled fuel to perform the depressing operation (the valve closing operation) simultaneously with the start of the movement of the moving core 30 to start.

[0046] After that, at a time t7 , if the needle 20 through the hub L2 is lifted down, the seat on the valve body side is seated 20s on the body side seat 11s to the flow channel 11b and the nozzle openings 11a to close. After that, the movable core moves 30 along with the mug 50 further to the valve closing side, and the movement of the cup 50 to the valve closing side at a time t8 stopped when the mug 50 the needle 20 touched. After that, the movable core moves 30 further to the valve closing side (inertial movement) by an inertial force, and then the movable core moves 30 by the elastic force of the second spring member SP2 to the valve opening (rebound) side. After that, the moving core collides 30 with the mug 50 for now t9 and moves along with the cup 50 toward the valve opening side (rebounds), but is quickly pushed back by the closing elastic force of the valve, and converges to an initial state shown in the column ( a ) from figure 4 is shown.

[0047] Therefore, the less such a bounce and the shorter the time required for convergence, the shorter the time from the end of injection to the return to the initial state. For this reason, in the multi-stage injection in which the fuel is injected multiple times per combustion cycle of the internal combustion engine, an interval between injections can be shortened and the number of injections included in the multi-stage injection can be increased. In addition, with the above-described shortening of the convergence time, the injection amount can be controlled with high accuracy when performing partial lift injection to be described below. With partial lift injection, a small amount is injected due to a short valve opening time by energizing the coil 17 stopped and the valve closing process is started before the needle 20 , which performs the valve opening operation, reaches the full lift position. <Description of the manufacturing process>

[0048] Next, a method of manufacturing the fuel injection valve 1 described.

[0049] This manufacturing method includes the first adjustment process of the adjustment load, the process for assembling the movable portion, the welding process, the fixing process, and the resin molding process described below.

[0050] In a manufacturing process or in a manufacturing method for the movable portion, the movable core 30 , the second spring element SP2 , the sleeve 40 and the mug 50 with the needle 20 assembled to the moving part M to manufacture. As will be described later in detail, the movable part M manufactured in such a way that the moving core 30 forced elastic force of the second spring element SP2 becomes a target value of the second set load.

[0051] In the welding process to be carried out next, first the nozzle opening body 11welded and connected to the main body 12 tied together. Next is the moving section M in the moving chamber 12a of the main body 12 arranged, and after that the solid core 13 , on which the support element 18 and the first spring element SP1 are assembled, the main body 12 , on which the movable section M is arranged, and the non-magnetic element 14 welded and coupled together.

[0052] In the fastening process to be carried out next, the coil 17a or the coil carrier 17a in a state where the coil 17 is wound between the mother element 15 and the solid core 13 arranged. After that, the mother element 15 on the solid core 13 fastened so that the main body 12 , the nonmagnetic element 14 and the solid core 13 be joined together by generating a surface pressure.

[0053] In the resin molding process to be carried out next, the resin member 16 with the connector housing 16a by pouring and solidifying molten resin onto the outer peripheral surface of the solid core 13 cast in resin.

[0054] In the first adjustment process of the adjustment load to be carried out thereafter, first the first spring element SP1 to the flow channel 13a of the solid core 13 assembled. After that, the support element 18 into the flow channel 13a of the solid core 13 press-fitted to a predetermined position. The predetermined position of the press-fitting can be adjusted in accordance with the fluctuations in the modulus of elasticity of the first spring member SP1 and the length in the direction of the axis line C and the variations in dimensions of the respective portions of the solid core 13 to be determined. In any case, the predetermined position (press-in position or press-fit position) is set so that the first of the needle 20 forced elastic force becomes a target value of the first set load. The fuel injector 1 is manufactured according to the manufacturing process including the above operations. <Detailed Description of Configuration Group A>

[0055] Next, among the configurations of the fuel injector 1 according to the present embodiment, a configuration group A , which is at least the one on the needle 20 formed press-fit section 23 and the one with the press-fitting portion 23 related configuration is described in detail.

[0056] The assembly of the movable portion described above includes the in figure 6 detailed steps S10 until S15 . First be in step S10 , as in figure 7, the moving core 30 , the second spring element SP2 and the sleeve 40 from the side (the lower end side) of the valve body side seat 20s into the needle 20s introduced. In this step S10 will, as in figure 8, the insertion of the sleeve 40 at a position of the outflow portion 24 before the press-fit section 23 stopped.

[0057] In the next step S11 becomes the needle 20 against the cup 50 pressed in a state where the mug 50 with the contact section 21 the needle 20 is assembled and the contact surface 52c the valve closing contact surface for transmitting the valve closing force 21b touched (see figure 8th). As a result, the core contact end face 51a by the amount corresponding to the gap L1 corresponds to is positioned closer to the nozzle opening than the valve opening contact surface 21a .

[0058] In the next step S12 becomes the sleeve 40 temporarily into the press-fit section 23 press-fitted with a predetermined degree of press-fitting. For example, while the mug 50 towards the axis lineC using a support device J1 is supported, the press fit load F2 on the load application surface 43b the sleeve 40 towards the axis line C using the load application device J2 upset. With a temporary press fit, the moving core touches 30 the mug 50 , the second spring element SP2 touches the sleeve 40 and the moving core 30 , and the second spring element SP2 is in an elastically deformed state. Therefore, the support device J1 a reaction force F1 against the second elastic force by the second spring member SP2 to support the cup 50 on.

[0059] The provisional press-fitting is a first press-fitting, and thereafter in step S15 (will be described later), a second press-fitting (main press-fitting) is performed. The degree of press-fitting in the temporary press-fitting is a predetermined amount regardless of a variation in the machine difference, and the temporary press-fitting is performed, for example, at a position away from the nozzle opening-side end portion of the press-fitting portion 23 toward the side opposite to the nozzle openings by a predetermined length in the direction of the axis line C is separated.

[0060] In the next step S13 becomes the second elastic force by the second spring member SP2 , i.e. the second set load, is measured. For example, a force (reaction force F1 ), through which the support device J1 pressed by the second elastic force is measured by a measuring device (not shown). In this step S13 the measurement is performed in a state where the cup 50 above the needle 20 is positioned, i.e. in a state where the direction of the movable portion M is set in the direction of an arrow showing the vertical direction in figure 8 indicates.

[0061] In the next step S14 a shortfall in the measured second set load compared to a second target set load is calculated and an additional degree of press fitting corresponding to the shortfall is calculated. For example, a modulus of elasticity of the second spring element SP2 measured in advance and the additional degree of press-fitting calculated based on the measured load deficiency amount and Young's modulus. Alternatively, the modulus of elasticity of the second spring element SP2 can be regarded as a standard value, and the additional degree of press-fitting can be calculated based on the measured load deficiency amount and the standard value.

[0062] In the next step S15 becomes the sleeve 40 with the in step S14 calculated additional degree of press-fit into the press-fit section 23 further press-fit (main press-fit). As described above is the assembly of the movable section M closed. In short, the second set load is measured during press-fitting, and main press-fitting is performed according to the measured value. Each step described above is an example of the configuration group described above A .

[0063] As described above, the fuel injector includes 1 according to the present embodiment, the needle 20 (valve body), the solid core 13 , the moving core 30 , the first spring element SP1 , the sleeve 40 (fixed element) and the second spring element SP2 . The moving core 30 touches the needle 20 at a time when the moving core 30 from the solid core 13 is attracted and moved by a predetermined amount to the side opposite to the nozzle openings, and opens the needle 20 . The first spring element SP1 is during the opening process of the needle 20 elastically deformed and exhibits the first elastic force to close the needle 20 on. The sleeve 40 will be on the needle20 fastened. The second spring element SP2 is between the sleeve 40 and the moving core 30 pinched and elastically deformed and exerts the second elastic force to move the movable core 30 to the side opposite the nozzle opening. The needle 20 has the press fit section 23 , in which the sleeve 40 is press-fitted on the side opposite to the nozzle openings, and the sleeve 40 is by press-fitting into the press-fitting portion 23 on the needle 20 fastened.

[0064] In short, the fuel injector 1 according to the present embodiment, has the core boosting structure in which the fuel injection valve 1 the needle 20 at the time when the moving core touches 30 is moved a predetermined distance to the side opposite to the nozzle openings to the fuel injection valve 1 to open, and the sleeve 40 contains the second spring element SP2 supporting the moving core 30 to the side opposite the nozzle openings. The sleeve 40 is achieved by pressing in or by press-fitting the sleeve 40 on the needle 20 fastened, and the press-in direction of the sleeve 40 is the press-in direction of the second spring element SP2 . This makes it possible to adjust and fix the degree of press-fitting and at the same time to measure the second elastic force that increases as the press-fitting progresses. Therefore, the second elastic force at the time of completion of the press-fitting can be set to the target setting load of the second spring member with high accuracy SP2 to be set.

[0065] The set load is a second elastic force exerted by the elastic deformation of the second spring member in a state where the second spring member is assembled with the fuel injection valve. Since the magnitude of the set load affects the valve opening and closing timing of the valve body, setting the set load to the target value with high accuracy contributes to reducing the variation in the fuel injection amount. In contrast to the present embodiment in which the fixed member is press-fitted into the valve body, in a structure in which the fixed member is welded and fixed to the valve body, the welded portion cannot be adjusted during measurement of the second elastic force. For this reason, the setting load varies due to variations between individuals, such as variations in machine difference of the second spring member and variations in valve body length, and thermal stress from welding.

[0066] On the other hand, in the present embodiment, since the fixed member is press-fitted into the valve body, the set load can be set to the target value with high accuracy as described above. This makes it possible to reduce the variation in fuel injection amount while adopting the core boost structure.

[0067] Furthermore, the fuel injection valve 1 according to the present embodiment, at least a portion of the sleeve 40 , the one with the press-fit section 23 in contact has a different hardness than the press-fitting portion 23 . For example, for the sleeve 40 and the needle 20 Metal base materials of different hardness can be used, or surface treatment such as heat treatment can be applied to the metal base material of the sleeve 40 be carried out to a section of sleeve 40 , the one with the press-fit section 23 in contact to make it locally harder than the sleeve 40 .

[0068] In contrast to the current embodiment, in which the sleeve 40 and the press-fit section 23 have the same hardness, there is concern that the sleeve 40 and the press-fit section 23adhere to each other if the press-fitting process is temporarily stopped when adjusting the degree of press-fitting during measurement. When the sticking occurs, the load required to perform the press-fitting again increases and the workability of the press-fitting deteriorates. Therefore, according to the present embodiment, with the different hardness, the above-mentioned sticking problem can be reduced and the press-fitting workability can be improved. The needle 20 is preferably harder than the sleeve 40 . The sleeve 40 preferably has a higher hardness than that of the movable core 30 . A specific example of the material of the needle 20 is martensitic stainless steel. A specific example of the material of the sleeve 40 is ferritic stainless steel.

[0069] Furthermore, the fuel injection valve 1 according to the present embodiment, at least a portion of the sleeve 40 , the one with the press-fit section 23 is in contact, has a lower hardness than the press-fitting portion 23 .

[0070] During the press fit, at least one of the two elements to be pressed in must be plastically deformed. Since the hardness is lower, the member is easier to plastically deform, and the press-fitting load required for press-fitting can be reduced. There the needle 20 a (high) hardness is required to avoid collision with the housing-side seat 11s (valve seat), there is a fear that the force required for press-fitting or the press-fitting load will be increased when the sleeve 40 harder than the hardness of the needle 20 is provided to produce a hardness difference. Therefore, according to the present embodiment in which the sleeve 40 a lower hardness than the press-fitting portion 23 , the above-mentioned concern for improving the press-fit workability can be inhibited. Because the sleeve 40 according to the present embodiment, not with the movable core 30 is in contact, a material softer than that of the inner core can be used 32 or similar that requires the contact.

[0071] For example, the solid lines show A1 and A2 in figure 11 the stress σ strain L diagrams of the needle obtained by a tensile test 20 and the sleeve 40 . As can be seen from the test result, a stress at a yield point (yield stress σ1) at which the sleeve 40 starts plastic deformation is less than that of the needle 20 . In the case of the needle 20 a test specimen is broken as soon as the yield stress is reached. The test result shows that the yield stress σ1 can be lowered by using the sleeve 40 harder and reduces the press-fitting load required for press-fitting.

[0072] Furthermore, in the fuel injection valve 1 according to the present embodiment, the sleeve 40 and the moving core 30 separated from each other without touching each other, even if the moving core 30 up to the maximum relative movement in the direction of the nozzle openings with respect to the needle 20 is moved. For example, the movable core moves 30 after closing the valve further to the nozzle opening side and the recoil occurs as described above. A state in which the further movement of the moving core 30 occurs after closing the valve and an interval between the lines of the second spring element SP2 Becomes zero, so that the elastic deformation amount of the second spring member SP2 becomes maximum is illustrated as a specific example of a case where the relative movement is maximized.

[0073] In contrast to the present embodiment, in a structure in which the sleeve 40 and the moving core 30are in contact with each other, a large margin for the press-fitting is fixed, and the plastic deformation caused by the press-fitting is increased because of the need to press-fit the sleeve 40 to reinforce. Therefore, according to the present embodiment of the structure in which the sleeve 40 and the moving core 30 do not touch, the need for reinforcement of the press-fitting can be reduced, so that the press-fitting load required for the press-fitting can be reduced and the workability of the press-fitting can be improved.

[0074] Furthermore, the fuel injection valve 1 according to the present embodiment, the sleeve 40 the cylindrical plug-in section 41 with the cylindrical shape inserted into the press-fitting portion 23 is used, and the inner peripheral surface 41a of the cylindrical insertion section 41 is in the outer peripheral surface of the press-fitting portion over the entire circumference 23 press fitted. Because the in the cylindrical insertion section 41 generated internal stress can be distributed over the entire circumference, can damage the sleeve 40 can be reduced by the concentration of internal stress according to the above configuration.

[0075] In the process of manufacturing the fuel injector 1 according to the present embodiment, the fuel injection valve 1 be made with the following structure. In other words, the needle will 20 (Valve body) showing the nozzle openings 11a opens and closes for injecting the fuel, operated to close the valve by the first elastic force generated by the first elastically deformed and deployed spring member SP1 is generated and used to open the valve by the movable core 30 operated, which are moved by the magnetic attraction. In addition, the moving core 30 by the second elastic force generated by the second spring member SP2 is generated is pushed to the side opposite the nozzle openings. This is elastically deformed by being between the on the needle 20 attached sleeve 40 (fixed element) and the moving core 30 is pinched. The above manufacturing method includes the steps S12 and S15 (Press-fitting method or press-fitting method) of press-fitting the sleeve 40 (fixed member) into the press-fitting portion 23 the needle 20 who have the sleeve 40 in the in the needle 20 formed press-fit section 23 press fits the moving core 30 touches and starts the valve opening process when the movable core 30 is moved by the magnetic attraction force by a predetermined amount. In addition, the above manufacturing method includes the step S13 (the load measuring process) of measuring the second elastic force in a state where the movable core 30 is immobilized during the press-fitting. In the press-fitting method, the degree of press-fitting is adjusted based on the measurement result to complete the press-fitting.

[0076] In short, in the manufacturing method according to the present embodiment, the fuel injection valve 1 be made with the core reinforcement structure that the sleeve 40 includes, which the second spring element SP2 contributes to the moving core 30 towards the side opposite the nozzle openings. While the sleeve 40 into the press-fit section 23 the needle 20 is press-fitted, the second elastic force is measured while the movable core 30 is not moved, and the amount of press-fitting is adjusted based on the measurement result to complete the press-fitting. Therefore, the second elastic force at the time of completion of the press-fitting can be set to the target setting load of the second spring member with high accuracy SP2 to be set.

[0077] Since, as described above, the magnitude of the set load or the set load affects the valve opening and closing timing of the needle 20 affected, setting the set load to the target value with high accuracy contributes to reducing a variation in the fuel injection amount. For this reason, according to the present embodiment, in which the set load can be set to the target value with high accuracy as described above, the fluctuation in the fuel injection amount can be reduced using the core boost structure.

[0078] Furthermore, in the manufacturing method according to the present embodiment, the next fuel injection valve 1 getting produced. The fuel injector 1 is arranged so that it is relative to the needle 20 is movable and encompasses the cup 50 holding the needle 20 touches by moving relative to the fuel nozzle openings and the first elastic force from the first spring member SP1 on the needle 20 transmits. In the manufacturing method described above, in step S13 (Load measurement process) the cup 50 moved relatively to the needle 20 to touch, and the pot 50 in the touching state with the moving core 30 brought into contact, causing the movement of the movable core 30 is regulated.

[0079] The magnitude of the second set load by the second spring element SP2 is important to prevent the moving core 30 moves towards the nozzle opening after the valve closes, i.e. this is important for a quick approach of the rebound. Therefore, setting the second elastic force in the valve-closed state as the second set load is advantageous for coping with the rebound convergence. Because the second elastic force by regulating the movement of the movable core 30 through contact with the cup 50 holding the needle 20 touched, on the moving core 30 is measured, the second elastic force is measured in the closed state of the valve. This makes it possible to easily cope with rebound convergence. <Detailed Description of Configuration Group B>

[0080] Next, among the configurations of the fuel injector 1 according to the present embodiment, a configuration group B that at least the fuel storage chamber B1 includes, which will be described below, and the configuration relating to the fuel tank B1 relates, with reference to the figure 12 to figure 14 described in detail. In addition, a modification of the configuration group B later with reference to the figure 15 to figure 23 described.

[0081] As in figure 12 is the fuel storage chamber B1 a portion where the fuel is accumulated in a state of being discharged from the moving core 30 , the mug 50 and the needle 20 is surrounded. In the following description, a surface of the inner core 32 on the side opposite the nozzle opening, which is the needle 20 touched, as the first core contact surface 32c , a surface of the inner core 32 holding the mug 50 touched, as the second core touch surface 32b and a surface of the inner core 32 that the guide element 60 touched, as the third core touch surface 32d designated.

[0082] Because the moving core 30 by the second elastic force on the cup 50 pressed is the moving core 30 always in contact with the cup 50 , except when the moving core 30 after closing the valve sluggishly moves and from the cup 50 is separated. More specifically, the second core contact area 32b of the inner core 32 is always in contact with the core contact end face 51a of the mug 50 . The cylindrical section 51 of the mug 50, which is the core contact end face 51a forms separates the inside and outside of the fuel storage chamber B1 from each other. The outside is an area where the fuel is radially outside the outer peripheral surface 51d of the mug 50 is present, the first core contact surface 32c located inside the fuel storage chamber B1 , and the third core contact surface 32d located outside of the fuel storage chamber B1 .

[0083] The fuel storage chamber B1 is an area extending from the outer peripheral surface of the core sliding portion 22 the needle 20 , the valve opening contact area 21a , the inner wall surface of the through hole 32a of the inner core 32 , the first core contact area 32c and the inner peripheral surface of the cylindrical portion 51 of the mug 50 is surrounded. The fuel storage chamber B1 is a region surrounded as described above in a state where the movable core 30 and the mug 50 touch each other. The fuel storage chamber B1 is a region surrounded as described above in a state where the valve body-side valve seat 20s the body side seat 11s touched and the needle 20 closed is.

[0084] communication grooves 32e are in the first core contact area 32c and the second core contact surface 32b of the inner core 32 intended. The communication grooves 32e connect the interior and exterior of the fuel storage chamber B1 each other in a state where the second core contact surface 32b the core contact endface 51a touched. The outside is a different space than the fuel storage chamber B1 , if the mug 50 and the moving core 30 touch each other.

[0085] Here, the outside corresponds to the fuel storage chamber B1 an area that is shown below as an example. In other words, a first area between the stopper contact end face 61a and the third core contact area 32d of the guide element 60 corresponds to an outside. The first area is an area formed in a state where the cup 50 and the moving core 30 touch each other and the moving core 30 and the guiding element 60 don't touch each other. A plane of the solid core 13 , which is the moving core 30 facing is called the solid side surface of the core 13b designated. A surface of the outer core 31 that the solid core 13 facing is called the movable core surface 31c designated. A second area between the surface facing the solid core 13b and the surface facing the movable core 31c , which is associated with the first area, corresponds to the outside. A third area communicating with the second area between the inner peripheral surfaces of the main body 12 (holder) and the non-magnetic element 14 (holder) and the outer peripheral surface of the outer core 31 corresponds to the outside.

[0086] As in figure 13 are the multiple (e.g. four) communication grooves 32e provided, and the multiple communication grooves 32e are at regular intervals in the circumferential direction, from the moving direction of the movable core 30 seen, arranged. The communication grooves 32e each have a shape linearly extending in the radial direction. Any of the multiple communication grooves 32e has the same shape. The positions in the circumferential direction of the communication grooves 32e differ from the circumferential positions of the through holes 31a .

[0087] The inner core 32 corresponds to a "contact section" in which the first core contact surface 32c and the second core contact surface 32b are formed. The Outer Core 31corresponds to a “core body section” made of a different material than the inner core 32 , on which the the solid core 13 facing moving core surface 31c is formed. The core body portion is outside of an area where the communication grooves are located 32e extend. In other words, the communication grooves 32e are in the inner core 32 intended, but not in the outer core 31 .

[0088] The communication grooves 32e are over the entire area in the radial direction of the inner core 32 are provided and become the outer peripheral surface of the inner core via the inner peripheral surface 32 guided. In other words, the communication grooves 32e are over the entire surface in the radial direction of the first core contact surface 32c , the second core contact area 32b and the third core contact area 32d intended.

[0089] As in figure 14, the communication grooves 32e one bottom panel each 32e1 , a vertical wall surface 32e2 and a sloping surface 32e3 on. The lower wall surface 32e1 has a shape perpendicular to the direction of movement of the movable core 30 extends, the vertical wall surface 32e2 has a shape that differs from the lower wall surface 32e1 in the direction of movement of the moving core 30 extends, and the inclined surface 32e3 has a shape that differs from the vertical wall surface 32e2 to the slot opening 32e4 extends while increasing the flow area. in a figure 14 has the inclined surface 32e3 a shape extending linearly from a top of the vertical wall surface 32e2 extends from.

[0090] Examples of a method of processing the communication grooves 32e are laser machining, electrical discharge machining, cutting with an end mill, and the like. First, a groove with a rectangular cross-section including the vertical wall surface 32e2 and the lower wall surface 32e1 processed. At this time, a burr generated at the time of machining may occur in the peripheral portion of the groove opening 32e4 in the vertical wall surface 32e2 remain. After that, however, the tapered surface 32e3 machined with trapezoidal cross-section to remove the burr.

[0091] If now the one in the fuel storage chamber B1 Existing fuel is compressed while moving the core 30 moved to the side opposite to the nozzle openings, the movement of the moving core becomes 30 hindered, so the movement speed (collision speed) when the moving core 30 moved a predetermined amount and the needle 20 touched becomes small. This reduces the above-mentioned effect of the core boost structure, that is, the effect that the valve body can be actuated to open even with the high-pressure fuel, while reducing an increase in the magnetic attraction force required to open the valve. In addition, since the movement of the moving core 30 is obstructed, a variation in the valve opening timing of the needle becomes 20 and a variation in the fuel injection amount is large.

[0092] On the other hand, includes the fuel injection valve 1 according to the present embodiment, the needle 20 (valve body), the solid core 13 , the moving core 30 , the first spring element SP1 (spring element) and the cup 50 (Element for transmitting the valve closing force or a valve closing force transmission element). The moving core 30 touches the needle 20 at a time when the moving core 30 from the solid core 13 is attracted and moved by a predetermined amount to the side opposite to the nozzle openings, and opens the needle 20 . The first spring element SP1 is in the process of opening the valve of the needle 20elastically deformed and the valve has an elastic closing force or an elastic valve closing force for closing the needle 20 on. The cup 50 is arranged so that it is relative to the needle 20 is movable, and if the cup 50 is moved relative to the nozzle opening side touches the cup 50 the needle 20 , the elastic closing force of the valve on the needle 20 transferred to. The moving core 30 has the first core contact area 32c and the second core contact surface 32b , and the communication grooves 32e are in the first core contact area 32c and the second core contact surface 32b provided to the interior and the exterior of the fuel storage chamber B1 to connect with each other.

[0093] When the moving core 30 moves to the side opposite to the nozzle openings, the fuel in the fuel storage chamber flows B1 accumulated fuel through the communication grooves 32e outward. Therefore, the compression of the fuel in the storage chamber B1 accumulated fuel inhibited, so that the moving core 30 can move easily. Because of this, reducing the collision speed of the moving core 30 are inhibited, so that the effect of reducing the magnetic attraction force by the core boosting structure can be promoted. Because the moving core 30 easy to move, can also vary the valve opening timing of the needle 20 and thus the variation of the fuel injection amount can be reduced.

[0094] Furthermore, in the fuel injection valve 1 according to the present embodiment, the plurality of communication grooves 32e provided, and the multiple connection grooves 32e are at regular intervals in the circumferential direction, from the moving direction of the movable core 30 seen, arranged.

[0095] According to the above configuration, the portions are easily protruded from the fuel storage chamber B1 flowing outward, present at regular intervals in the axial direction. For this reason, when the moving core moves 30 in the axial direction, a change in the direction of inclination of the movable core 30 can be reduced with respect to the axial direction. Because the behavior of the moving core 30 can be prevented from becoming unstable, the variation in valve opening performance can be further reduced. If three or more communication grooves 32e are provided at regular intervals in the circumferential direction, the effect of inhibiting behavioral instability is promoted.

[0096] Furthermore, the movable core includes 30 in the fuel injector 1 according to the present embodiment, the inner core 32 (contact portion) and the outer core 31 (Core body portion) made of a different material than the inner core 32 exist. The inner core 32 becomes with the first core contact surface 32c and the second core contact surface 32b formed, and the outer core 31 will with the the solid core 13 facing moving core surface 31c educated. The Outer Core 31 is excluded from an area where the communication grooves 32e are provided.

[0097] Since the surface facing the moving core 31c of the outer core 31 Can have a flat shape without a groove, can absorb the magnetic attraction from the solid core 13 is attracted, are not reduced by the communication grooves.

[0098] Also located in the fuel injector 1 according to the present embodiment, the third core contact surface 32d of the moving core 30 that the guide element 60 touched, outside of the fuel storage chamber B1 . The communication grooves 32e are also in the third core contact area 32d in addition to the first core contact area 32c and the second core contact surface 32b intended.

[0099] When the needle 20 is in the full lift position touches the inner core 32 the guiding element 60 . When in the above contact state, the stopper contact end face 61a of the guide element 60 and the third core contact surface 32d of the inner core 32 are in close contact with each other, there is a concern that a phenomenon (bonding phenomenon) will occur in which the third core contact surface 32d hardly from the stopper contact end face 61a is separated. Because the communication grooves 32e in the present embodiment also in the third core contact area 32d are provided, the fuel becomes in a state of contact with the stopper contact end face in consideration of the above concern 61a the third core contact area 32d fed when the moving core 30 starts to move to the nozzle opening side when the excitation is off. Because the moving core 30 can be prevented from coming into close contact with the guide member 60 to come and difficult from the guide member 60 be able to separate, the possibility that the beginning of the movement of the moving core 30 to the nozzle opening side due to the above-mentioned adhesive force can be reduced. Therefore, the response time of valve closure from deenergization to needle closure may vary 20 reduced and the valve closing behavior improved.

[0100] Furthermore, in the fuel injector 1 according to the present embodiment, the communication grooves 32e the lower wall surface 32e1 , which are perpendicular to the direction of movement of the moving core 30 extends, and the vertical wall surface 32e2 , extending from the lower wall surface 32e1 extends in the direction of movement.

[0101] To remove burrs that are in the groove opening 32e4 the communication grooves 32e arise, it is desirable to have the first core contact surface 32c and the second core contact surface 32b to polish. For example, buffing is translated from a line separated by a two-dot chain line into figure 14 to a position indicated by a solid line. In the present embodiment, after assembling the inner core 32 with the outer core 31 the communication grooves 32e and the outer communication grooves 31e attached by cutting or the like, and thereafter the above-mentioned polishing is simultaneously applied to the outer core 31 and at the inner core 32 carried out.

[0102] In contrast to the present embodiment, in the case where the vertical wall surface 32e2 is absent and the shape is represented by a one-point chain line, a cross-sectional area of ​​the communication grooves 32e small and a ratio of the cross-sectional area to be polished to the cross-sectional area of ​​the communication grooves 32e big. As a result, an influence of the variation in the polishing depth becomes on the cross-sectional area of ​​the communication grooves 32e large, so the variation in the cross-sectional area of ​​the communication grooves 32e gets big. For this reason, there is a fluctuation in the degree of out of the fuel storage chamber B1 to the outside through the communication grooves 32e leaking fuel is large, and a fluctuation in the mobility of the moving core 30 becomes large, resulting in a reduction in the fluctuation of the valve opening timing of the needle 20 with special needs. On the other hand, according to the present embodiment, since the vertical wall surface 32e2 is provided, the ratio of the cross-sectional area to be polished is small, and the influence of the variation of a polishing depth on the cross-sectional area of ​​the communication grooves 32e becomes small. For this reason, the fluctuation in the degree of outflow of fuel from the fuel storage chamber B1 to the outside through the communication grooves 32e reduced, and the variation of the valve opening timing of the needle 20 can be promoted. [Modification B1]

[0103] Although the in figure 12 communication grooves shown 32e not in the outer core 31 are provided, as in figure 15 shown, in addition to the communication grooves 32e that in the inner core 32 are provided, communication grooves (outer communication grooves 31e) in the outer core 31 be provided. in a figure 15, the inner diameter side end portion of the outer communication grooves communicates 31e directly with the outer diameter side end portion of the communication grooves 32e .

[0104] As in figure 16 are the multiple (e.g. four) outer communication grooves 31e provided and the multiple outer communication grooves 31e are in the moving direction of the moving core 30 arranged at regular intervals in the circumferential direction. The outer communication grooves 31e each have a shape linearly extending in the radial direction. Any of the multiple outer communication grooves 31e has the same shape. The location of the outer communication grooves 31e in the circumferential direction differs from the position of the through holes 31a in the circumferential direction.

[0105] The outer communication grooves 31e and the communication grooves 32e have the same position in the circumferential direction. In an example from figure 16 are four outer communication grooves 31e arranged at regular intervals in the circumferential direction, but six outer communication grooves 31e may be arranged at regular intervals in the circumferential direction. In this case, it is desirable to determine the location of the through holes 31a set in the circumferential direction so that the circumferential distance to the adjacent outer communication grooves 31e is equal to.

[0106] The outer communication grooves 31e are over the entire surface of the outer core 31 provided in the radial direction and extending from the inner peripheral surface to the outer peripheral surface of the outer core 31 . In other words, the outer communication grooves 31e are over the entire area of ​​the face facing the movable core 31c provided in the radial direction. The cross-sectional shape of the outer communication grooves 31e is the same as the one in figure 14 cross-sectional shape of the communication grooves 32e , and the outer communication grooves 31e have the same bottom wall area, vertical wall area and sloping area as those of the communication grooves 32e . As described above, is figure 14 is a sectional view taken along a line XIV-XIV from figure 13 and shows the cross-sectional shape of the communication groove 32e , extending in the radial direction of the moving core 30 extends, which were recorded perpendicular to the direction of extension. The cross-sectional shape of the outer communication grooves 31e is the same as that of the communication grooves 32e , and the cross-sectional shape has a bottom wall surface, a vertical wall surface, and a tapered surface in a cross section of the outer communication grooves 31e , taken perpendicular to the direction of extension.

[0107] As described above, according to the present modification, with the outer communication grooves 31e , since the out of the outer diameter side end portion of the communication grooves 32e outflowing fuel through the outer communication grooves 31e diffuses, an increase in fuel pressure at the outer diameter-side end portion of the communication grooves 32e prevented and that through the communication grooves 32e outflowing fuel are promoted. This allows an increase in fuel pressure between the guide element 60 and the inner core 32 be prevented.

[0108] Because in the present modification, the end portion on the inner diameter side of the outer communication grooves 31e directly with the outer diameter side end portion of the communication grooves 32ecommunicates, the outflow of the fuel from the end portion on the outer diameter side can be further promoted.

[0109] Since the outer communication grooves 31e over the entire area of ​​the face facing the movable core 31c are provided in the radial direction, in the present modification, the fuel flowing out of the outer-diameter-side end portion of the outer communication grooves flows 31e leaks directly into the gap between the inner peripheral surface of the holder and the outer peripheral surface of the outer core 31 . For this reason, an increase in fuel pressure at the outer diameter side end portion of the outer communication grooves 31e prevented and the outflow of fuel through the communication grooves 32e and the outer communication grooves 31e be promoted.

[0110] Further, in the present modification, regarding the dimension of the outer communication grooves 31e a width dimension (circumferential direction dimension) of a portion of the outer communication grooves 31e , which becomes the solid core 13 opens towards, set smaller than a depth dimension (dimension in the axis line C ) of the outer communication grooves 31e . According to the above configuration, the cross-sectional area of ​​the flow passage of the outer communication grooves 31e can be increased while reducing the area facing the movable core 31c , by providing the outer communication grooves 31e is caused can be prevented. The "flow channel cross-sectional area" is an area with a cross-section perpendicular to the direction of flow when the fuel is in the fuel storage chamber B1 radially outward through the outer communication grooves 31e flows. In other words, since the width dimension is smaller than the depth dimension as described above, the fuel discharge from the fuel storage chamber B1 at the time of the valve opening operation can be realized while preventing the reduction of the magnetic attractive force. [Modification B2]

[0111] In the present, in figure 17 and figure 18 is a connecting groove 32f to connect the multiple communication grooves 31e intended. The connecting groove 32f has a ring shape around the through hole 32a gradient shape and connects all (four in an example of figure 18) communication grooves 31e commonality. The connecting groove 32f connects the outer diameter side end portion of the communication grooves 31e . The connecting groove 32f is obtained by cutting the outer diameter side edge portion of the inner core 32 manufactured. In addition, the inner diameter side edge portion of the outer core 31 cut so that the connecting groove 32f themselves both over the outer core 31 as well as the inner core 32 extends.

[0112] In the in the figure 15 and figure 16 illustrated embodiment can also in the figure 17 and figure 18 illustrated connecting groove 32f are provided, and each of the plurality of communication grooves 32e and the multiple outer communication grooves 31e can through the connecting groove 32f be connected to each other.

[0113] As described above, according to the present modification with the connection groove 32f , since the out of the outer diameter side end portion of the communication grooves 32e outflowing fuel through the connecting groove 32f diffuses, an increase in fuel pressure at the outer-diameter side end portion of the communication grooves 32e prevented and that through the communication grooves 32e outflowing fuel are promoted.

[0114] In addition, with the connection of the multiple communication grooves 31e a change in the direction of inclination of the movable core 30 with respect to the axial direction can be prevented when the movable core 30moves in the axial direction because the fuel flows out smoothly from the plurality of communication grooves 31e can be promoted. Because the behavior of the moving core 30 can be prevented from becoming unstable, the variation in valve opening performance can be further reduced. [Modification B3]

[0115] In the figure 12 communication grooves shown 32e are across the entire face of the inner core 32 educated. On the other hand, communication grooves 32g according to the figure 19 and figure 20 over part of the first core contact surface 32c , the total area of ​​the second core contact area 32b and a portion of the third core contact area 32d intended. More precisely, the communication grooves 32g not over the entire area of ​​the first core contact area 32c provided in the radial direction but partially in a portion of the first core contact surface 32c , which is attached to the second core contact surface 32b adjacent. The communication grooves 32g are over the entire area of ​​the second core contact area 32b provided in the radial direction. The communication grooves 32g are not over the entire area of ​​the third core contact area 32d in the radial direction but partially in a portion of the third core contact surface 32d , which is attached to the second core contact surface 32b adjacent.

[0116] In the figure 12 communication grooves shown 32e have a shape linearly extending in the radial direction, while the communication grooves 32g have an oblique shape according to the present modification. In other words, as in figure 20 are the communication grooves 32g from the direction of the axis line C seen circular, and as in figure 19 are the communication grooves 32g triangular in section.

[0117] As described above, according to the present modification with the inclined communication grooves 32g the communication grooves 32g just by pressing a drill blade tip against the moving core 30 can be manufactured, and therefore the communication grooves 32g be edited easily. [Modification B4]

[0118] in the in figure 12 are the communication grooves 32e in the contact area of ​​the moving core 30 provided so that the inside and outside of the fuel storage chamber B1 communicate with each other. In the present modification, which is in figure 21, by providing connection openings 20c in the needle 20 the interior of the fuel storage chamber B1 and the inner passage 20a the needle 20 connected with each other.

[0119] In a state where the mug 50 the valve closing contact area 21b and in a state of being the cup 50 the second core contact area 32b touched are the connection openings 20c at a position including the first core contact surface 32c towards the axis line C arranged. Alternatively, the entirety of the connection openings 20c on the opposite side of the nozzle openings with respect to the first core contact area 32c arranged. The multiple connection ports 20c are provided, and the multiple connection ports 20c are, from the direction of movement of the needle 20 seen from, arranged at regular intervals in the circumferential direction. The connection openings 20c have a shape that linearly changes in the radial direction of the needle 20 extends.

[0120] As described above, according to the present modification, in which the communication holes 20c in the needle 20 are provided in the fuel storage chamber B1 accumulated fuel when moving the core 30moved to the side opposite to the nozzle openings through the communication openings 20c into the inner passage 20a (the outside) of the needle 20 out. Therefore, the compression of the fuel in the storage chamber B1 accumulated fuel inhibited, so that the moving core 30 can move easily. Because of this, reducing the collision speed of the moving core 30 are inhibited, so that the effect of reducing the magnetic attraction force by the core boosting structure can be promoted. Because the moving core 30 easy to move, can also vary the valve opening timing of the needle 20 and thus the variation of the fuel injection amount can be reduced. [Modification B5]

[0121] In the present, in figure 22 shown modification are in the needle 20 Sliding surface communication grooves 20d provided so that the interior of the fuel storage chamber B1 and the inner passage 20a the needle 20 communicate with each other. The sliding surface communication grooves 20d are in the sliding surface on the valve body side 21c (please refer figure 7) the needle 20 provided on which the mug 50 glides.

[0122] The majority of sliding surface communication grooves 20d is provided, and the plurality of sliding surface communication grooves 20d is, from the direction of movement of the needle 20 seen from, arranged at regular intervals in the circumferential direction. The sliding surface communication grooves 20d each have a shape that linearly changes in the direction of the axis line C the needle 20 extends.

[0123] As described above, according to the present modification, in which the sliding surface communication grooves 20d in the sliding surface on the valve body side 21c , which is the sliding surface between the needle 20 and the mug 50 is, are provided in the fuel storage chamber B1 accumulated fuel through the sliding surface communication grooves 20d outward when the moving core 30 moved to the side opposite to the nozzle openings. In the present specification, the outside is a gap between the valve closing contact surface 21b and the valve closing force transmission contact surface 52c and the inner passage 20a . Therefore, the compression of the fuel in the storage chamber B1 accumulated fuel inhibited, so that the moving core 30 can move easily. Because of this, reducing the collision speed of the moving core 30 are inhibited, so that the effect of reducing the magnetic attraction force by the core boosting structure can be promoted. Because the moving core 30 easy to move, can also vary the valve opening timing of the needle 20 and thus the variation of the fuel injection amount can be reduced. [Modification B6]

[0124] In the present, in figure 23 shown modification are in the inner core 32h second sliding surface communication grooves 32h provided so that the interior of the fuel storage chamber B1 and the moving chamber 12a are connected to each other. The second sliding surface communication grooves 32h are on the surface of the inner core 32 provided on which the needle 20 slides, i.e. on the inner peripheral surface of the inner core 32 .

[0125] The multiple second sliding surface communication grooves 32h are provided, and the plural second sliding surface communication grooves 32h are, from the moving direction of the movable core 30 seen from, arranged at regular intervals in the circumferential direction. The second sliding surface communication grooves 32h each have a shape that linearly changes in the direction of the axis line C of the moving core 30 extends.

[0126] As described above, according to the present modification, in which the second sliding surface communication grooves 32h on the sliding surface between the needle 20 and the inner core 32 are provided in the fuel storage chamber B1 accumulated fuel through the communication grooves of the second sliding surface 32h into the movable chamber 12a (the outside) off when the moving core 30 moved to the side opposite to the nozzle openings. Therefore, the compression of the fuel in the storage chamber B1 accumulated fuel inhibited, so that the moving core 30 can move easily. Because of this, reducing the collision speed of the moving core 30 are inhibited, so that the effect of reducing the magnetic attraction force by the core boosting structure can be promoted. Because the moving core 30 easy to move, can also vary the valve opening timing of the needle 20 and thus the variation of the fuel injection amount can be reduced. <Detailed Description of Configuration Group C>

[0127] Next, among the configurations of the fuel injector 1 according to the present embodiment, a configuration group C having at least one feed flow channel to be described below and a configuration related to the feed flow channel with reference to FIG figure 24 to figure 26 and figure 12 described in detail. In addition, later a modification of the configuration group C with reference to the figure 27 bis figure 35 described.

[0128] As in figure 24 are main flow channels 20e with grooves in the valve closing contact surface 21b the needle 20 intended. As in figure 25 is the valve closure contact surface 21b formed in a region extending annularly from the moving direction of the movable core 30 seen from, extends, and the main flow channels 20e are each shaped so as to extend so as to connect an annular inner side and an annular outer side via an annular region in which the valve closing contact surface 21b is trained. The main flow channels 20e each have a straight section 201 extending linearly as viewed from the moving direction of the movable core. In the case of the present embodiment, the entirety of the main flow passages are the same 20e the entirety of the straight or rectilinear section 201 .

[0129] The annular inner side corresponds to an inner passage 20a the needle 20 . The annular outside corresponds to a gap B2 (please refer figure 12) between the inner surface of the cup 50 and the outer surface of the needle 20 , which is provided in a state in which the valve closing contact surface 21b the mug 50 touched. Therefore, the main flow channels communicate 20e the inner passage 20a the needle 20 with the gap B2 in a state where the valve closing contact surface 21b the mug 50 touched.

[0130] The main flow channels 20e (supply flow channels) each have a shape extending to form an inner peripheral surface of the needle 20 showing the inner passage 20a defined, and an outer peripheral surface of the needle 20 associate. The outer peripheral surface of the needle 20 acts as a wall surface of a passage through which the fuel flows through the nozzle orifices 11a flows. The fuel that flows through the passage formed by the gap between the outer peripheral surface of the needle 20 and the inner peripheral surface of the cylindrical portion 51 is formed flows into the fuel storage chamber B1 . Thereafter, the fuel flows through a gap between the inner peripheral surface of the movable core 30 and the outer peripheral surface of the needle 20and a gap between the outer peripheral surface of the movable core 30 and the inner peripheral surface of the main body 12 into the movable chamber 12a and flows through the flow channel 12b into the nozzle openings 11a .

[0131] As in figure 25 are an inner peripheral edge portion 201a and an outer peripheral edge portion 201b the valve closing contact surface 21b in the needle 20 chamfered. The main flow channels 20e (Supply flow channels) each have a shape that defines the inner peripheral edge portion 201a and the outer peripheral edge portion 201b connects.

[0132] As in figure 25, there are multiple (e.g., four) main flow channels 20e provided, wherein the plurality of main flow channels 20e in the moving direction of the moving core 30 are arranged at regular intervals in the circumferential direction. In other words, the multiple main flow channels 20e are at regular intervals in the circumferential direction on the valve closing contact surface 21b the needle 20 arranged. The main flow channels 20e each have a shape extending linearly in the radial direction. Each of the multiple main flow channels 20e has the same shape. As in figure 26 has the cross section of the straight section 201 the main flow channels 20e a shape having an arcuate bottom surface convex toward the nozzle opening side. The edge portions of the outer peripheral portion and the inner peripheral portion of the contact portion 21 the needle 20 are chamfered, and the outer peripheral portion and the inner peripheral portion of the contact portion 21 are conically shaped.

[0133] A depth dimension 201h the main flow channels 20e is as a dimension of the main flow channels 20e in the direction of the axis line C defined, and a width dimension 201w the main flow channels 20e is as a dimension of the needle 20 around the direction of the axis line C defined (see figure 24). The depth dimension 201h the main flow channels 20e is larger than the width dimension 201w the main flow channels 20e .

[0134] In the case of the core boost structure, where the cup 50 the needle 20 touched at the time when the moving core 30 itself along with the shell 50 begins to move by a predetermined amount by the start of energization of the coil, the following concern arises. In other words, when the mug 50 and the needle 20 are in close contact with each other and touch each other, the phenomenon occurs that the cup 50 hard off the needle 20 is to be separated (chaining phenomenon), causing the beginning of the movement of the moving core 30 is delayed by a predetermined amount, leading to concern that the valve opening performance will be deteriorated.

[0135] To meet the above concern, the present embodiment includes the needle 20 (valve body), the solid core 13 , the moving core 30 , the first spring element SP1 (spring element) and the cup 50 (Element for transmitting the valve closing force). If the moving core 30 from the solid core 13 attracted and moved by a predetermined amount touches the movable core 30 the valve opening contact area 21a that at the needle 20 is formed, and actuates the needle 20 to open the valve. The first spring element SP1 is in the process of opening the valve of the needle 20 elastically deformed and the valve has an elastic closing force or an elastic valve closing force for closing the needle 20 on. The cup 50 touches the one on the needle 20 trained valve closing contact surface 21b and transmits the elastic valve closing force to the needle 20 . When the moving core 30along with the mug 50 begins to move the predetermined amount, touches the cup 50 the valve closing contact area 21b . The needle 20 has the main flow channels 20e (Supply flow channels) for supplying the fuel to the valve closing contact surface 21b in the contact state with the cup 50 .

[0136] When the moving core 30 starts to move by the predetermined amount, the fuel therefore becomes the valve closing contact surface 21b supplied in a state where the movable core 30 the mug 50 touched. Because of this, the possibility that the mug 50 not in close contact with the needle 20 comes and is difficult to get off the needle 20 can be separated, so that the beginning of the movement of the movable core 30 is delayed by the predetermined amount due to the above-mentioned force of close contact. Therefore, the response time of the valve opening from the start of energization of the coil 17 until the needle begins to open 20 shortened and the valve opening behavior improved. In addition, the variation in the valve opening timing due to the hindrance to the movement of the movable core 30 can be reduced and the variation in fuel injection amount can be reduced.

[0137] Furthermore, in the fuel injection valve 1 according to the present embodiment, the main flow channels 20e (supply flow channels) through those in the valve closing contact area 21b the needle 20 provided grooves formed. For this reason, the processing of the supply flow channels can be simplified, and the supply flow channels can be compared to the case where the through-holes are used as the supply flow channels in the needle 20 or the cup 50 are provided can be easily provided.

[0138] Furthermore, at the fuel injection valve 1 according to the present embodiment, the valve closing contact surface 21b formed in a portion extending annularly in the moving direction of the movable core 30 seen, extends, and the main flow channels 20e the feed flow channels extend to connect the annular inside and the annular outside across the area. For this reason, the fuel from both sides of the annular inside and the annular outside of the valve closing contact surface 21b is supplied, so that the reduction of the coupling phenomenon can be promoted by the above-mentioned close contact.

[0139] Furthermore, in the fuel injection valve 1 according to the present embodiment, the multiple main flow channels 20e provided, and the multiple main flow channels 20e are at regular intervals in the circumferential direction, from the moving direction of the movable core 30 seen, arranged. According to the above configuration, there are sections where a force of the cup 50 that are in close contact with the needle 20 comes, is relieved or taken up at regular intervals in the axial direction. When the moving core 30 starts to move by the predetermined amount in the axial direction, the tilting direction of the movable core 30 can no longer be changed with respect to the axial direction. Because the behavior of the moving core 30 can be prevented from becoming unstable, the variation in valve opening performance can be further reduced. If three or more main flow channels 20e are provided at regular intervals in the circumferential direction, the effect of reducing behavioral instability is promoted.

[0140] In this example, if the depth dimension 201h the main flow channels 20e is too small when the flow channel cross-sectional area of ​​the main flow channels 20e with progressive wear of the valve closure contact surface 21b becomes small, the flow rate of the through the main flow channels 20e flowing fuel cannot be adequately guaranteed. If the latitude 201wthe main flow channels 20e is too large, the surface pressure when the cup 50 by the elastic valve closing force against the needle 20 is pressed, too large, and the pressure receiving area of ​​the valve closing contact surface 21b cannot be adequately secured. This will reduce the wear progress of the valve closing contact surface 21b accelerated.

[0141] Considering the above points, in the fuel injector 1 according to the present embodiment, the depth gauge 201h the main flow channels 20e larger than width 201w the main flow channels 20e set. Because of this, the flow rate of the through the main flow channels 20e fuel flow is sufficiently secured and the progress of wear of the valve closing contact surface 21b be prevented due to the excessive surface pressure. [Modification C1]

[0142] In the present modification, the cross-sectional shape of the main flow passages 20e modified. In other words, the straight section 201 the in figure 26 shown main flow channels 20e a cross-sectional shape with an arcuate bottom surface. Alternatively, the straight section 201 have a triangular cross-sectional shape, as in figure 27, or have a rectangular cross-sectional shape as shown in FIG figure 28 shown.

[0143] As in figure 29, the straight section 201 have a cross-sectional shape that combines a rectangle with a trapezoid. Specifically, the main flow channels 20e one bottom panel each 20e1 , a vertical wall surface 20e2 and a sloping surface 20e3 . The lower wall surface 20e1 has a shape perpendicular to the direction of movement of the moving core 30 extends, the vertical wall surface 20e2 has a shape that differs from the lower wall surface 20e1 extending in the moving direction, and the inclined surface 20e3 has a shape that differs from the vertical wall surface 20e2 to a groove opening 20e4 extends while increasing the flow area. in a figure 29 has the inclined surface 20e3 a shape extending linearly from a top of the vertical wall surface 20e2 extends from.

[0144] As a processing method of the in figure 29 shown main flow channels 20e the laser machining, the spark erosion, the machining by an end mill and the like are exemplified. First, a groove with a rectangular cross-section including the vertical wall surface 20e2 and the lower wall surface 20e1 processed. At this time, burrs generated at the time of processing may appear in a peripheral portion of the groove opening 20e4 in the vertical wall surface 20e2 remain. After that, however, the above burrs are removed by machining the tapered surface 20e3 with a trapezoidal cross-section removed. [Modification C2]

[0145] In the present, in figure 30, the supply flow channel includes a branch flow channel 205 , which from the main flow channels 20e branches off and the main flow channels 20e connects to each other, in addition to the straight sections 201 , which are the main flow channels 20e are. The branch flow channel 205 has an annular shape when viewed from the moving direction of the movable core 30 viewed from. In particular, the branch flow channel 205 has a ring shape showing the inner passage 20a surrounds. The branch flow channel 205 has a groove shape with the same depth as the straight section 201 . The branch flow channel 205 has a shape that extends around the entire perimeter, around all the main flow channels 20e to connect with each other.

[0146] In an example from figure 25 are four main flow channels20e provided, but in the present modification there are eight main flow passages 20e provided, and the plurality of main flow channels 20e are, from the moving direction of the moving core 30 seen from, arranged at regular intervals in the circumferential direction. A branch flow channel 205 with an annular shape is provided.

[0147] In an example from figure 25 becomes the valve closing contact surface 21b in the circumferential direction through the straight section 201 divided. On the other hand, in the present modification in figure 30 because the branch flow channel 205 in addition to the straight section 201 is provided, the valve closing contact surface 21b divided in the radial direction in addition to the division in the circumferential direction.

[0148] In a state where the needle 20 the mug 50 touches, part of the fuel flowing from both sides of the annular inner side and the annular outer side into the main flow passages 20e flows, the valve closing contact area 21b supplied from the circumferential direction. Further, the fuel, after flowing into the main flow channels 20e into the branch channel 205 has flowed, the valve closing contact surface 21b supplied from the radial direction.

[0149] As described above, according to the present modification, the supply flow channel has in addition to the main flow channels 20e those of the main flow channels 20e branched branch flow channel 205 , which connects the annular inside and the annular outside. Because of this, the fuel gets from both the main flow channels 20e as well as from the branch flow channel 205 to the valve closing contact surface 21b guided. This makes it possible to promote a reduction in the binding phenomenon by the above-mentioned close contact.

[0150] Furthermore, the branch flow channel 205 in the fuel injection valve according to the present modification has an annular shape when viewed from the moving direction of the needle 20 viewed from. For this reason, both ends of the branch flow channel communicate 205 with the main flow channels 20e , so that the inflow of fuel from the main flow channels 20e to the branch flow channel 205 and supplying the fuel to the valve closure interface 21b can be promoted. [Modification C3]

[0151] In the present modification, which is in figure 31 have the main flow channels 20e each of the straight sections 201 and the inflow sections 202 . The straight sections 201 each have a shape resulting from the direction of movement of the moving core 30 extends linearly. The inflow section 202 communicates with the straight section 201 and thus forms an inflow connection 203 for the fuel to the main flow channel 20e . A flow channel cross section of the inflow section 202 has a larger shape than a flow channel cross section of the straight section 201 . Especially in the below ( b ) in figure 32 has the inflow portion 202 a shape in which the groove width increases toward the nozzle opening. In a plan view, which in figure 31, the inflow section has 202 a shape in which the groove width increases toward the radially outer side.

[0152] From those at both ends of the main flow channels 20e provided fuel inflow openings 203 and 204 is the inflow port lying outside of the annular area mentioned above 203 with the inflow section 202 provided with an increased area. On the other hand is the inflow port 204 , which is located within the annularly extending region, is not provided with an inflow portion having an increased area. The edge portions of the outer peripheral portion and the inner peripheral portion of the contact portion 21 the needle 20are chamfered, and the outer peripheral portion and the inner peripheral portion of the contact portion 21 are conically shaped.

[0153] The main flow channels 20e are produced by laser processing or by a laser process. A one-point catenary in figure 32 indicates the center of a laser beam. First, as in the column ( a ) from figure 32 shows a groove in a section corresponding to the straight section 201 corresponds, generated by a laser. More specifically, the laser processing is started from the inside in the radial direction, and the laser beam is thereby moved from the inside to the outside. When machining the straight section 201 a focal point of the laser beam is made to coincide with a bottom surface of the groove.

[0154] After the laser beam to the outer end portion of the straight section 201 was moved to editing the straight section 201 complete, the laser beam is further moved to the radially outer side, and the groove in the portion corresponding to the inflow portion 202 is processed by the laser as shown in column ( b ) from figure 32 shown. The focal point of the laser beam at the time of machining the inflow portion 202 is adjusted so that it aligns with the focal point of the laser beam at the time of processing the straight portion 201 matches. Since the outer peripheral portion of the contact portion 21 is conically shaped, the lower surface of the inflow section 202 cut at a point deviating from the focal point of the laser beam. Since a cutting width at the bottom surface of the inflow portion 202 larger than a cutting width at the bottom surface of the straight section 201 is made, the inflow section 202 formed in a shape in which the groove width is larger toward the nozzle opening side.

[0155] As described above, the main flow channels have 20e according to the present modification, the straight section 201 , which extends linearly from the direction of movement of the moving core 30 extends, and the inflow section 202 , the one with the straight section 201 communicates to the inflow port 203 of the fuel to form. The flow channel cross-section of the inflow section 202 has a shape in which the area is compared to the flow channel cross section of the straight section 201 is enlarged. For this reason, the fuel flows compared to the case where the inflow portion 202 is not provided, easily from the inflow port 203 into the straight section 201 , and therefore the fuel supply to the valve closing contact area 21b be promoted. [Modification C4]

[0156] the inside figure 24 feed flow channel is through the grooved main flow channel 20e in the needle 20 educated. In contrast, in the present modification, which is in figure 33 is a through hole 52d in the Cup 50 provided, and the through hole 52d provides a supply flow channel for supplying the fuel to the valve closing interface 21b .

[0157] According to the above configuration, when the movable core 30 begins to move a predetermined amount, the fuel of the flow channel 13a the valve closing contact surface 21b supplied in a state where the movable core 30 the mug 50 through the through hole 52d touched. For this reason, similar to the embodiment of FIG figure 24, the responsiveness of the valve opening is improved and the variation in the fuel injection amount due to the variation in the valve opening timing can be reduced because the cup can be prevented 50 in close contact with the needle 20 comes and is difficult to get off the needle 20 separate. [Modification C5]

[0158] in the in figure 24 are the grooved main flow channels 20e in the needle20 intended. On the other hand, in the present, in figure 34 and figure 35 illustrated modification a grooved main flow channel 210e in a plate 210 provided, which is described below.

[0159] The plate 210 is between the needle 20 and the mug 50 arranged and is circular, plate-shaped and made of metal. In the example shown is the main flow channel 210e on the surface of the plate 210 provided on the nozzle opening side, alternatively it may be on the surface of the plate 210 are formed on the side opposite to the nozzle opening side. There are several (e.g. four) main flow channels 210e provided, and the plurality of main flow channels 210e are, from the moving direction of the moving core 30 seen from, arranged at regular intervals in the circumferential direction. The main flow channels 210e each have a shape extending linearly in the radial direction. The multiple main flow channels 210e each have the same shape.

[0160] The main flow channels 210e each have a shape that extends to include the annular inner side and the annular outer side over the annular region in which the valve closing contact surface 21b is formed, in the same way as that in figure 25 shown main flow channels 20e associate. Therefore, the main flow channels communicate 210e the inner passage 20a the needle 20 with the gap B2 in a state where the valve closing contact surface 21b the mug 50 through the plate 210 touched.

[0161] The plate 210 is not with the needle 20 and the mug 50 coupled, rather than part of the needle 20 or the cup 50 Are defined. A through hole 52a of the mug 50 and a through hole 210a , which with the inner passage 20a the needle 20 are in the plate 210 intended.

[0162] As described above, according to the present modification, when the movable core 30 begins to move by a predetermined amount, the fuel in the flow channel 13a the valve closing contact surface 21b supplied in a state where the movable core 30 the mug 50 through the plate 210 through the main flow channel 210e touched. For this reason, similar to the embodiment of FIG figure 24, the needle 20 be prevented from making close contact with the plate 210 to come and get off the record with difficulty 210 to separate, the valve opening response is improved, and the variation in the fuel injection amount due to the variation in the valve opening timing can be reduced. [Modification C6]

[0163] the inside figure 24 feed flow channel is through the grooved main flow channel 20e in the valve closing contact area 21b the needle 20 educated. On the other hand, in the present modification, the main flow channel 20e eliminated, and the feed flow channel is formed by asperities, which will be described below. In other words, the shot peening to use an abrasive material with the valve closing contact surface 21b to collide is performed to the surface roughness of the valve closing contact surface 21b to increase, thereby increasing the valve closing contact area 21b is provided with bumps. The bumps are through the main river channel 20e replaced, which forms the feed flow channel. In other words, the surface roughness of the valve closing contact surface 21b is made rougher than that of the inner peripheral surface of the part forming the inner passage 20a the surface of the needle 20 forms. Alternatively, the surface roughness of the valve closing contact surface 21b made rougher than that of the outer peripheral surface of the needle 20 .

[0164] Corresponding to the supply flow channel, the hardness of the valve closing contact surface is increased by the unevenness 21b increased by shot peening. For this reason, the abrasion resistance of the valve closing contact surface 21b by the repeated collision of the cup 50 with the needle 20 be improved.

[0165] Instead of on the needle as described above 20 to blast to form the bumps, blasting can also on the contact surface 52c the closing force transmission of the valve of the cup 50 be performed to form the bumps. In this case, the supply flow channel is formed by the bumps located on the contact surface 52c of the valve closing force transmission. <Detailed description of configuration group D>

[0166] Next, among the configurations of the fuel injector 1 according to the present embodiment, a configuration group D with at least one recessed surface 60a , which will be described below, and one on the recessed area 60a related configuration with reference to the figure 36 and figure 37 described in detail.

[0167] As described above, forms the inner peripheral surface of the cylindrical portion 61 of the guide element 60 the sliding surface 61b that with the outer peripheral surface 51d of the cylindrical section 51 of the mug 50 glides. The sliding surface 61b shifts the outer peripheral surface 51d of the mug 50 , the movement of the cup 50 towards the axis line C to guide and at the same time the movement of the cup 50 limit in the radial direction. The sliding surface 61b is a surface with a shape parallel to the direction of the axis line C runs.

[0168] The recessed area 60a is on a surface of the inner surface of the guide member 60 formed with the nozzle openings of the sliding surface 61b opposite side is connected. The recessed area 60a is shaped to be deepened in a direction where the gap to the cup 50 is increased in the radial direction. The recessed area 60a has a shape that extends annularly around the axis line C extends and has the same shape in each circumferential cross section.

[0169] One to the sliding surface 61b adjacent area 60a1 the recessed area 60a is a surface coextensive with the sliding surface 61b on the side opposite to the nozzle opening and shaped to form a gap CL1 from the mug 50 gradually increased in the radial direction as the distance from the sliding surface 61b increases. The adjacent area 60a1 includes a sloping surface 60a2 , which extends linearly in a cross-section containing the axis line C includes. A marginal section 60b or a boundary section 60b of the guide element 60 , which is a boundary between the adjacent surface 60a1 and the sliding surface 61b , has a shape curved to be convex inward in the radial direction, i.e., an R-shape. This allows carrying the mug 50 through the guide element 60 be prevented.

[0170] At a portion where the stopper contact end face 61a and the sliding surface 61b connects is a beveled section 61c provided, which is formed by chamfering in a slanting shape. The edge portion including the border between the beveled portion 61c and the sliding surface 61b has a convexly curved shape inward in the radial direction and prevents the cup 50 from the guide element 60 is worn out.

[0171] In the Cup 50 are an edge section 51g , which is the outer peripheral surface 51d and the core contact end face 51a connects, and an edge section 51h, Which is the transmission element-side sliding surface 51c and the core contact end face 51a connects, beveled to have a slanting shape or an R-shape. An edge section 21d the needle 20 , which is the sliding surface on the valve body side 21c and the valve opening contact area 21a connects is also slanted to have a slanting shape or an R-shape. A marginal section 21e , which is a boundary between the chamfered portion on the side opposite to the nozzle opening with respect to the valve body-side sliding surface 21c is formed, and the valve body side sliding surface 21c contains, has a shape curved to be convex in the radial direction, and prevents wear between the cup 50 and the needle 20 .

[0172] In the following description, part of the surface of the cup 50 , which is the outer peripheral surface 51d of the cylindrical section 51 of the mug 50 includes and is parallel to the direction of the axis line C extends, referred to as a parallel surface. In an example from figure 36 corresponds to the entire outer peripheral surface 51d a parallel surface, and an area in figure 37 by the symbol M1 shown is a parallel plane in the surface of the cup 50 .

[0173] Further, a surface which is connected to the side opposite to the nozzle openings of the parallel surface and which is on the radially inner side of the parallel surface becomes a connection surface 51e designated. The interface 51e is so curved that it is convex in the radial direction from the cup 50 protrudes. In the surface of the mug 50 is an area in figure 37 by the symbol M2 is marked, the connection surface 51e . The area of ​​the connection surface 51e , which is connected to the side opposite to the parallel surface, is a spring contact surface to which the first elastic force is applied by contact with the first spring member SP1 is exercised. The spring contact surface has a shape perpendicular to the direction of the axis line C extends.

[0174] A boundary line between the parallel face and the joining face 51e is called the connection boundary line 51f denoted (see circle in figure 37). When the moving core 30 towards the axis line C moves, the cup also moves 50 towards the axis line C . A moving area M3 the connection boundary line 51f towards the axis line C is completely in one area by the above movement N1 the recessed area 60a towards the axis line C .

[0175] The outer peripheral surface of the guide member 60 is in the section 13c with increased diameter of the solid core 13 press fitted. Since the guiding element 60 into the solid core 13 is press-fitted, the guide member 60 not against the solid core 13 tilted. A dimensional tolerance of the outer peripheral surface of the guide member 60 or the inner peripheral surface of the increased diameter portion 13c however, is tilted. Since the mug 50 against the guide element 60 is slidably arranged, on the other hand, is between the cup 50 and the guiding element 60 a sliding gap CL1 intended. Accordingly, the cup 50 against the solid core 13 and the guiding element 60 be tilted. In other words, the axle line C of the mug 50 can in relation to the axis line C of the solid core 13 be inclined.

[0176] There the needle 20 movable on the cup 50 is arranged is between the needle 20 and the mug 50 a sliding gap CL2 intended. Therefore, the needle 20opposite the tilting cup 50 be tilted further. In other words, the axle line C the needle 20 can opposite the axle line C of the inclinable cup 50 be more inclined. Therefore corresponds to an angle (maximum inclination angle) at which the needle 20 maximum and the mug 50 maximum in the same direction as the needle 20 is tilted, the assumed maximum tilt angle θ2 (please refer figure 36) in which the cup 50 is tilted. The sloping surface 60a2 is shaped so that an angle of inclination θ1 (please refer figure 36), in which the oblique surface 60a2 opposite the sliding surface 61b of the guide element 60 inclined is greater than the maximum inclination angle θ2 of the mug 50 .

[0177] The gap CL1 between the parallel face of the cup 50 and the sliding surface 61b of the guide element 60 is set larger than the gap CL2 between the pot 50 and the needle 20 . Hence the angle of inclination of the cup 50 , if the gap CL2 is zero, greater than the slant angle of the needle 20 , if the gap CL1 is zero.

[0178] A sliding distance between the cup 50 and the guiding element 60 in the gap CL1 is adjusted so that it is longer than a sliding distance or a sliding distance between the cups 50 and the needle 20 in the gap CL2 . In this example, the longer the glide path or distance, the less inclination caused by the gap. For example, the longer the gliding path or the gliding distance in the gap CL1 is, the less the inclination of the cup 50 against the guide element 60 . The longer the glide path or the glide distance in the gap CL2 is, the less the inclination of the needle is 20 opposite the cup 50 . Even when these two slopes are at their maximum, the interface is 51e set so that they are the guide element 60 not touched.

[0179] The guiding element 60 consists of a magnetic material, and the cup 50 is made of a non-magnetic material. In general, a non-magnetic material has a lower hardness than a magnetic material. However, in the present embodiment, the cup 50 and the guiding element 60 the same hardness. In other words, it becomes a non-magnetic material with high hardness as a cup 50 used instead of a general non-magnetic material. The hardness of the cup 50 (pot hardness) and the hardness of the guide element 60 (Guide element hardness) are, for example, values ​​ranging from Vickers hardness HV600 to HV700. If the deviation of the guide element hardness in relation to the cup hardness is in a range of -10% to +10% of the cup hardness, both degrees of hardness are considered to be equally hard.

[0180] With progressive wear due to sliding between the cup 50 and the guiding element 60 becomes the cup 50 against the guide element 60 largely tilted, and consequently the needle 20 along with the mug 50 largely tilted. If the inclination of the needle 20 increases, the valve opening and closing timing of the needle varies 20 , and the variation in fuel injection amount increases.

[0181] To meet the above concern, the present embodiment includes the needle 20 (valve body), the solid core 13 , the moving core 30 , the first spring element SP1 (spring element), the cup 50 (Element for transmitting the valve closing force) and the guide element 60 .

[0182] The moving core 30 touches the needle 20 at a time when the moving core 30 from the solid core 13 is attracted and moved a predetermined amount, and causes the needle 20to perform the valve opening operation. The first spring element SP1 is in the process of opening the valve of the needle 20 elastically deformed and the valve has an elastic closing force or an elastic valve closing force for closing the needle 20 on. The cup 50 has a valve body transmission section (circular plate part 52 ), which is the first spring element SP1 and the needle 20 touches the elastic valve closing force on the needle 20 to transfer, and a cylindrical section 51 , which is the moving core 30 in the direction of the nozzle openings. The guiding element 60 has a sliding surface 61b , which is the outer peripheral surface 51d of the cylindrical section 51 shifts so that the movement of the cylindrical section 51 towards the axis line C out and the movement of the cylindrical section 51 is limited in the radial direction. The guiding element 60 is with the recessed plane 60a provided, which is a surface that is connected to the sliding surface 61b on the side opposite to the nozzle opening and which is recessed in a direction where the gap meets the cup 50 is increased in the radial direction. The valve body transmission portion is a circular plate member 52 with a circular plate shape, and the cylindrical portion 51 is a shape that differs from the outer peripheral edge of the circular plate of the circular plate part 52 extends to the nozzle opening side.

[0183] In the surface of the mug 50 is a surface that is the outer peripheral surface of the cylindrical portion 51 includes and is parallel to the direction of the axis line C extends, the parallel surface, a surface connected to the parallel surface on the side opposite to the nozzle openings and located on the radially inner side of the parallel surface, the connection surface 51e , and a boundary line between the parallel surface and the connecting surface 51e is the connection boundary line 51f . The moving area M3 the connection boundary line 51f in the axial direction is entirely within one range N1 the recessed area 60a in the axial direction. In other words, the location of the connection boundary 51f in the axial direction is in the range N1 , in which the recessed surface 60a is provided, regardless of whether the needle 20 fully raised or closed.

[0184] If the mug 50 moves in the axial direction while resting on the guide member 60 slides, lies the connection boundary line 51f hence the recessed area 60a opposite and does not touch the sliding surface 61b . This can prevent the mug 50 in a state where the surface pressure component in the axial direction is large, against the guide member 60 being pressed and the wear of the cup 50 can be reduced. Because of this, the tilt of the cup 50 and consequently the inclination of the needle 20 can be reduced, so that the variation in the fuel injection amount due to the variation in the valve opening and closing timing of the needle 20 can be reduced.

[0185] Furthermore, at the fuel injection valve 1 according to the present embodiment, to the sliding surface 61b adjacent area 60a1 the recessed area 60a shaped so that the gap CL1 between the fuel injector 1 and the mug 50 in the radial direction with increasing distance or distance from the sliding surface 61b gradually enlarged. In this example, in contrast to the present embodiment, in the case that the adjacent surface 60a1has a shape in which the radial direction is increased stepwise, the surface pressure when the edge portion of the stepped portion is pressed against the cup moving toward the nozzle opening side 50 increased, and there is a concern that wear will be accelerated. Because the adjacent area 60a1 according to the present embodiment has a shape gradually expanding in the radial direction, the above-mentioned surface pressure can be alleviated and the fear of promoting wear between cups 50 and guiding element 60 be reduced.

[0186] Also included in the fuel injection valve 1 according to the present embodiment, the adjacent surface 60a1 the sloping surface running linearly in the sectional view 60a2 . The angle of inclination θ1 , where the sloping surface 60a2 opposite the sliding surface 61b inclined is greater than the assumed maximum angle of inclination θ2 , at which the mug 50 is inclined. Because of this, the possibility that the tipped cup 50 with the inclined surface 60a2 comes into contact can be reduced, and the fear of wear and tear between the cup 50 and the guiding element 60 to promote can be reduced.

[0187] Furthermore, in the fuel injector 1 according to the present embodiment, the limiting portion 60b including the boundary between the adjacent face 60a1 and the sliding surface 61b a shape curved convexly inward in the radial direction. In this example, in contrast to the present embodiment, in the case that the rim portion has a sharp shape, the surface pressure when the rim portion is pressed against the cup moving toward the nozzle opening side 50 increased, and there is a fear that wear is promoted. Because the edge section 60b has a bulging shape in the radial direction in the present embodiment, in consideration of the above circumstances, the surface pressure can be alleviated and the fear of promoting wear can be reduced.

[0188] There is also the fuel injection valve 1 according to the present embodiment, the guide member 60 made of a magnetic material and the cup 50 made of a non-magnetic material. According to the above configuration, the parallel surface of the cup can be prevented 50 through the on the pot 50 Electromagnetic attraction force acting in the radial direction against the sliding surface 61b of the guide element 60 is pressed. This can reduce wear between the cups 50 and the guiding element 60 be reduced.

[0189] Furthermore, the fuel injection valve 1 according to the present embodiment, the cup 50 and the guiding element 60 the same hardness. In general, a non-magnetic material has a lower hardness than a magnetic material. However, as described above, in the present embodiment, a high-hard nonmagnetic material is used as the cup 50 used instead of a general non-magnetic material. For this reason, the possibility that the wear of the member on the low-hardness side is accelerated in the case of a hardness difference can be avoided, whereby the on the cup 50 acting electromagnetic attraction is avoided.

[0190] Also in the fuel injector 1 according to the present embodiment, the gap CL1 between the parallel face of the cup 50 and the sliding surface 61b of the guide element 60 bigger than the gap CL2 between the cup 50 and the needle 20 .

[0191] In this example, the needle 20 in one with respect to the direction of the axis line C be opened and closed in the tilted state. If the needle 20 is tipped, the cup becomes 50 tipped by a tipping force, and when the cup 50is tilted, the force with which the cup is increased 50 against the guide element 60 pressed, which can lead to wear. Therefore, according to the present embodiment, in which the recessed surface 60a used in a configuration that addresses the wear described above, the anti-wear effect of the recessed surface 60a come into their own. <Detailed Description of Configuration Group E>

[0192] Next, a configuration group E, containing at least the press-fit structure between the outer core 31 and the inner core 32 and the configuration related to the press-in structure among the configurations of the fuel injection valve 1 according to the present embodiment in detail with reference to FIG figure 38 and figure 39 described. In addition, later a modification of the configuration group E with reference to the figure 40 to figure 42 described.

[0193] As in figure 38 are a press-fit surface 31p , attached to the inner peripheral surface of the outer core 31 is formed, and a press-fitting surface 32p , attached to the outer peripheral surface of the inner core 32 is formed, press fitted into each other. The press fitting surfaces 31p and 32p will not cover the entire surface in the direction of the axis line C formed, but partly in the direction of the axis line C .

[0194] In the present embodiment, the press-fitting surfaces are 31p and 32p on part of the moving core 30 formed on the side opposite to the nozzle opening, and in the following description, a portion of the outer core 31 , in which the press-fit surface 31p is formed, and the entire portion in the direction of the axis line C including the press-fit surface 31p as a press pass area 311 designated. A section of the outer core 31 , in which the press-fit surface 31p is not formed, and the entire part in the radial direction that is the press-fitting surface 31p does not include is considered a non-press-fit area 312 designated. In other words, towards the axis line C becomes the outer core 31 into a press-fit area 311 on a side opposite to the nozzle orifice and a non-press-fit area 312 on the side of the nozzle opening, which is at the press-fitting area in the direction of the axis line C adjacent, subdivided.

[0195] The non-press pass area 312 comes with a locking section 31b formed, of a locking portion 32i of the inner core 32 towards the axis line C touched. The locking section 32i prevents the inner core 32 in relation to the outer core 31 by the collision of the inner core 32 with the guiding element 60 and the like is deflected to the nozzle opening side. In the inner peripheral surface of the non-press-fitting area 312 is a gap B3 from the inner core 32 in a section from the locking section 31b up to the limit of the press-fit range 311 intended. In other words, there is the gap B3 at the boundary between the press-fit area 311 and the non-press pass area 312 .

[0196] The gap B3 Functions as a burr containment area that occurs when the inner core is press-fitted 32 into the outer core 31 develop. Because the material of the outer core 31 is softer than that of the inner core 32 , the burrs on the press-fit surface 31p of the outer core 31 generated. More specifically, the above burrs are generated when the nozzle opening side end portion of the press-fitting surface 32p of the inner core 32 part of the press-fit surface 31p of the outer core 31 scrapes off.

[0197] In the present embodiment, after assembling the inner core 32with the outer core 31 the communication grooves 32e and the outer communication grooves 31e made by cutting or the like, and then the first core contact surface 32c and the second core contact surface 32b sanded. As a result are the positions of the first core contact area 32c and the second core contact surface 32b in the axis line C aligned.

[0198] The outer peripheral surface of the outer core 31 , in the figure 39 indicated by a solid line shows a state before press-fitting with the inner core 32 and is circular (perfect circle) in plan view. On the other hand, in the state after press fitting, it expands with the inner core 32 the outer peripheral surface of the press-fitting portion 311 of the outer core 31 outward in the radial direction, as indicated by a dashed line in figure 39 is displayed. A section where the through holes 31a are present (small expansion section 331a or extension section 311a ), but is less likely to expand than a section where the through holes 31a are not present (large expansion section 331b or extension section 311b ). Therefore, the outer peripheral surface of the press-fitting portion 311 not a perfect circle after press-in deformation, and the large expansion section 311b has a shape with a larger diameter than the small expansion section 311a . In the state before press-fitting, the diameter corresponds to the outer peripheral surface of the press-fitting portion 311 the diameter of the non-press-fit area 312 . Therefore, in the state after press-fitting, the outer peripheral surface of the press-fitting portion has 311 a larger diameter than the outer peripheral surface of the non-press-fitting portion 312 (please refer figure 38).

[0199] The holder for moving the moving core 30 has the main body 12 , which is a magnetic element having magnetism, and the nonmagnetic element 14 , which is in the direction of movement to the main body 12 adjacent, and an end surface of the main body 12 and an end face of the non-magnetic member 14 are welded together. A portion of the holder corresponding to the outer peripheral surface of the press-fitting portion 311 faces is as a portion facing the press-fitting portion H1 defined, and a portion of the retainer corresponding to the outer peripheral surface of the non-press-fitting portion 312 faces is as a portion facing the non-press-fitting area H2 Are defined. A minimum gap in the radial direction between the inner peripheral surface of the portion facing the press-fitting portion H1 and the outer peripheral surface of the press-fitting portion 311 is as a press-fit section gap CL3 defined, and a minimum gap in the radial direction between the inner peripheral surface of the portion facing the non-press-fitting area H2 and the outer peripheral surface of the non-press-fitting portion 312 is as a non-press-fit section gap CL4 Are defined. A minimum inner diameter of the portion facing the press-fitting portion H1 becomes larger than a minimum inner diameter of the portion facing the non-press-fitting area H2 adjusted so that the press-fitting section gap CL3 larger than the non-press-fit section gap CL4 is.

[0200] The inner peripheral surface of the portion facing the press-fitting portion H1 has a shape that is parallel to the direction of movement of the movable core 30 (in the direction of the axis line C ) extends. The inner peripheral surface of the portion facing the non-press-fitting area H2 has a parallel face H2a , which extends parallel to the direction of movement, and a connecting surface H2b forming the inner peripheral surface of the portion facing the press-fitting portion H1 and the parallel plane H2a connects. The interface H2bhas a shape where the inside diameter is parallel to the surface H2a gradually decreases. Although part of the main body 12 in the portion facing the non-press-fitting area H2 is included is the non-magnetic element 14 not in the portion facing the non-press-fitting area H2 included, and the parallel surface H2a and the interface H2b are through the main body 12 educated. In other words, the main body 12 has a form in which the parallel surface H2a and the interface H2b have different inner diameter dimensions. The non-press-fit section gap CL4 , which is the smallest gap between the portion facing the non-press-fitting area H2 and the non-press pass area 312 is corresponds to a gap in the parallel surface H2a , by the main body 12 is formed.

[0201] More specifically, a flow channel cross-sectional area defined by the press-fitting portion gap CL3 is defined to be larger than a flow channel cross-sectional area defined by the non-press-fit section gap CL4 is defined. These flow channel cross-sectional areas are areas with a cross-section perpendicular to the axis line C of the flow channel passing through the press-fitting section gap CL3 and CL4 are defined.

[0202] The inner peripheral surface H1a of the portion facing the press-fitting portion H1 has a shape parallel to the direction of movement. The portion facing the press-fit portion H1 includes part of the non-magnetic element 14 and part of the main body 12 . The non-magnetic element 14 is formed to have a uniform inner diameter dimension along the entire axis line C-direction. The gap of the press-fitting section or the press-fitting section gap CL3 , which is the smallest gap between the portion facing the press-fitting portion H1 and the press fit area 311 is corresponds to a gap at a portion of the main body 12 on the opposite side of the nozzle opening with respect to the joint surface H2b or on the non-magnetic element 14 .

[0203] If the moving core 30 , which from the solid core 13 is tightened by press-fitting the inner core 32 for the collision with the guide element 60 and the like and the outer core 31 configured for the magnetic circuit becomes the outside diameter of the outer core 31 slightly expanded by pressing in. As a result, the gap between the inner peripheral surface of the holder and the movable core 30 receives, and the outer peripheral surface of the outer core 31 small, and the flow resistance that the moving core 30 received from the fuel present in the gap becomes large. Since it is difficult to cope with the amount by which the outer diameter expands by the press fitting, there occurs a machine differential fluctuation in the amount of flow resistance, resulting in a change in the moving speed of the movable core 30 leads. As a result, there is a variation in engine difference in valve opening response, resulting in a large variation in injection quantity.

[0204] On the other hand, includes the fuel injection valve 1 according to the present embodiment, the needle 20 (valve body), the solid core 13 , the moving core 30 , the main body 12 (holder) and the non-magnetic member 14 (Holder) and the guide element 60 (stopper element). The moving core 30 has a cylindrical shape and moves together with the needle 20 by the magnetic attraction to the nozzle openings 11a to open. The holder has a movable chamber 12a , which is filled with fuel and takes the moving core 30 in the moving chamber 12a in a mobile state. The guiding element 60touches the moving core 30 and hinders the moving core 30 remember to move away from the nozzle openings 11a to remove. The moving core 30 has the inner core 32 , which is the guiding element 60 touches, and the outer core 31 , which is in the outer peripheral surface of the inner core 32 is press fitted. The Outer Core 31 has the press fit area 311 , which is in the direction of movement of the movable core 30 into the outer peripheral surface of the inner core 32 is press-fitted, and the non-press-fitted area 312 , which is not in the outer peripheral surface of the inner core 32 is pressed and in the moving direction to the press-fitting portion 311 adjacent. From the gaps between the inner peripheral surface of the holder and the outer peripheral surface of the movable core 30 is the smallest gap CL3 in the press pass area 311 larger than the smallest gap CL4 in the non-press pass area 312 .

[0205] In this example, the flow resistance that the moving core 30 from the fuel present in the gap between the outer peripheral surface of the outer core and the inner peripheral surface of the holder is greatly affected by the smallest gap when the size of the gap changes according to the axial position. The gap CL3 in the press pass area 311 in the gap between the inner peripheral surface of the holder and the outer peripheral surface of the movable cores is larger than the gap CL4 in the non-press pass area 312 . In contrast to the current embodiment, therefore, when the minimum gap CL3 in the press pass area 311 is smaller than the minimum gap CL4 in the non-press pass area 312 , the flow resistance through the gap CL3 in the press pass area 311 strongly influenced. As a result, there is a large variation in drag between machines. In contrast, according to the present embodiment, the minimum gap is CL3 in the press pass area 311 larger than the minimum gap CL4 in the non-press pass area 312 . For this reason, the flow resistance through the gap CL3 in the press-fit areas 311 not be affected, and the moving speed of the movable core 30 cannot be varied. Thereby, the variation of the engine difference in the valve opening performance can be prevented, and hence the variation of the injection quantity can be reduced.

[0206] Furthermore, the fuel injection valve 1 according to the present embodiment, the inner peripheral surface H1a of the portion facing the press-fitting portion H1 a shape parallel to the direction of movement. The inner peripheral surface of the portion facing the non-press-fitting area H2 has a parallel face H2a , which extends parallel to the direction of movement, and a connecting surface H2b forming the inner peripheral surface of the portion facing the press-fitting portion H1 and the parallel plane H2a connects. The interface H2b has a shape where the inside diameter is parallel to the surface H2a gradually decreases.

[0207] A boundary between a section (large extent section 311b) , in which expansion is largely generated by press-fitting, and a section (small expansion section 311a) , in which the expansion is hardly generated, is gradually expanded. In view of the above circumstances, according to the present embodiment, with the bonding surface H2b , the inner diameter of which gradually decreases, the gap of the magnetic circuit passing through the section of the joint surface H2b is formed must be made as small as possible. As in figure 38 shown, the interface H2b have a tapered shape in which the inner diameter changes linearly and gradually, a curved shape in which the inner diameter changes in a curved manner, or a stepped shape in which the inner diameter changes in a stepwise manner.

[0208] Furthermore, the holder in the fuel injector 1 according to the present embodiment, the main body 12 (magnetic element) with magnetism and that in the moving direction to the main body 12 adjacent non-magnetic element 14 , and the face of the main body 12 and the face of the non-magnetic member 14 are welded together. This makes it possible to perform a step of enlarging or reducing the inner diameter of the holder and a step of removing a welding mark from the inner peripheral surface of the holder in a series of operations, whereby the labor for enlarging or reducing the inner diameter of the holder can be reduced .

[0209] Furthermore, in the fuel injection valve 1 according to the present embodiment, three or more through-holes continuous in the direction of movement 31a in the outer core 31 provided at regular intervals in the circumferential direction. According to the above configuration, there are three or more places at regular intervals in the axial direction where the flow resistance that the movable core 30 from the fuel in the moving chamber 12a receives is low. For this reason, when the moving core moves 30 towards the axis line C a change in the direction of inclination of the movable core 30 opposite the direction of the axis line C be reduced. Because the behavior of the moving core 30 can be prevented from becoming unstable, the variation in valve opening performance can be further reduced. [Modification E1 ]

[0210] In the present, in figure 40 is a maximum outer diameter of the outer core 31 in the press pass area 311 smaller than a maximum outside diameter of the outer core 31 in the non-press pass area 312 .

[0211] In particular, the outside diameter of the press-fitting portion 311 formed to be sufficiently smaller than the outside diameter of the non-press-fitting portion 312 before press-fitting, and the outer diameter of the press-fitting portion 311 is formed to be smaller than the outside diameter of the non-press-fitting portion 312 is even if the press-fit area 311 is expanded by the press fitting. In short, in a state before press-fitting, the outer peripheral surface of the press-fitting portion becomes 311 cut so that a recess section 311c is formed, and the depth of cut of the recessed portion 311c is set so large that the recessed portion 311c is maintained even after the expansion caused by the pressing. In addition, is an inner diameter dimension of the portion facing the non-press-fitting area H2 towards the axis line C in the same manner as that of the portion facing the press-fitting portion H1 .

[0212] Da, as described above, the outer peripheral surface of the press-fitting portion 311 smaller than the non-press fit area 312 and the inner peripheral surface of the portion facing the non-press-fitting area H2 equal to the pressed-in opposite section H1 is formed is the press-fitting portion gap CL3 larger than the non-press-fit section gap CL4 . For this reason, in the present modification, the same effects as the fuel injection valve are obtained 1 in figure 39 shown. [Modification E2 ]

[0213] In the present modification, which is in figure 41, the entire press-fit portion is facing portion H1 of the holder from the non-magnetic element 14 , and the main body 12 is not in the press-fit facing portion H1 contain. For example, a length of the press-fitting surfaces 31p and 32p towards the axis line C compared to the structure of figure39 shortened so that the entire portion facing the press-fit portion H1 from the non-magnetic element 14 consists. Alternatively, compared to the structure in figure 39 the length of the non-magnetic element 14 towards the axis line C extended so that the entire, the press-fit portion facing portion H1 from the non-magnetic element 14 consists. Because in the present modification, the press-fitting section gap CL3 larger than the non-press-fitting section gap CL4 is provided, the same effects as the fuel injection valve are also obtained in the present modification 1 in figure 39 shown. [Modification E3 ]

[0214] In the present modification, which is figure 42 becomes a portion of the press-fitting area 311 , which is expanded in the radial direction by the press-in process, removed, and the maximum outside diameter of the outer core 31 in the press pass area 311 is formed to match the maximum outside diameter of the outer core 31 in the non-press pass area 312 matches.

[0215] More specifically, in a state before press-fitting with the inner core 32 the outer core 31 , whose outer peripheral surface is circular (perfect circle) in plan view, prepared (preparation process) and with the inner core 32 press fitted (press fitting process). Thereafter, the large expansion portion expanded by the press-fitting becomes 311b (please refer figure 39) after the press fitting cut (cutting process), the outer core 31 is shaped so that the outer peripheral surface becomes circular (a perfect circle) in plan view. The inside diameter dimensions of the press-fit section facing section H1 and the portion facing the non-press-fitting area H2 are in the direction of the axis line C same. Therefore, the press-fitting section gap CL3 and the non-press-fitting section gap CL4 same. Therefore, the present modification exhibits the same effects as those of figure 39 (Second embodiment)

[0216] While the valve closing force transmission element according to the first embodiment through the cup 50 is formed, a valve closing force transmission member according to the present embodiment is formed by a first cup 501 , a second cup 502 and a third spring element SP3 (please refer figure 43), which are described below. Except for the configuration to be described below, the configuration of a fuel injection valve according to the present embodiment is the same as the configuration of the fuel injection valve according to the first embodiment.

[0217] The first mug 501 touches a first spring element SP1 and a needle 20 and transmits a valve closing elastic force from the first spring member SP1 on the needle 20 . In short, the first cup points 501 the same function as the circular plate section 52 of the mug 50 according to the first embodiment. The first mug 501 is with a through hole 52a similar to that of the first embodiment.

[0218] The third spring element SP3 is an elastic member which is elastically deformed in the axial direction to exert an elastic force. One end of the third spring element SP3 touches a contact surface 501a of the first cup 501 , and the other end of the third spring element SP3 touches a contact surface 502a of the second cup 502 . As a result, the third spring element SP3 between the first cup 501 and the second cup 502 pinched and is elastically deformed in the axial direction and has an elastic force due to the elastic deformation.

[0219] The second cup 502 touches the moving core 30during the valve closing process, around the moving core 30 in the direction of the nozzle openings. In short, the second cup 502 has the same function as the cylindrical section 51 of the mug 50 according to the first embodiment. The third spring element SP3 exerts a function of transmitting a force in the axial direction between the first cup 501 and the second cup 502 out.

[0220] The needle 20 has a main body portion 2001 and an enlarged diameter section 2002 or a section with an enlarged diameter 2002 on. A valve closing contact surface 21b is at one end of the main body section 2001 formed on the side opposite to the nozzle openings. The valve closing contact area 21b touches a valve closing force transmission contact surface 52c of the valve closing force transmission element (first cup 501 ) in the same manner as in the first embodiment.

[0221] The increased diameter section 2002 is closer to the side of the nozzle orifice than the contact surface 21b for closing the valve or the valve closing contact surface 21b and has a circular plate shape in which the diameter of the main body portion 2001 is enlarged. A valve opening contact surface 21a is on a nozzle opening side surface of the increased diameter portion 2002 educated. The valve opening contact area 21a touches the first core contact surface 32c of the moving core 30 in the same way as in the first embodiment. The length of a gap between the contact surface 21a for the valve opening or the valve opening contact surface and the first core contact surface 32c towards the axis line C in the valve-closable state corresponds to a gap L1 according to the first embodiment.

[0222] In a state immediately after switching energization of a coil 17 from OFF to ON, a magnetic attraction force acts on the moving core 30 to the movement of the moving core 30 to start toward the valve opening side. If then the moving core 30 moved while the second mug 502 is pushed up, and the amount of movement the gap L1 reached, the first core contact surface collides 32c of the moving core 30 with the valve opening contact surface 21a in the needle 20 .

[0223] In the current embodiment, the guide member is 60 eliminated, and the moving core 30 touches the solid core 13 and thereby regulates the valve opening operation amount or lift of the needle 20 . If the moving core 30 with the needle as described above 20 collides, a gap is created between the solid core 13 and the moving core 30 , and the length of the gap in the direction of the axis line C corresponds to one stroke L2 the first embodiment.

[0224] The elastic force of the first spring element SP1 also acts on the needle 20 up to the time of the collision. After the collision, the moving core moves 30 by the magnetic attraction force further, and when the amount of movement after the collision a stroke L2 reached, the movable core collides 30 with the solid core 13 and stops moving. A separation distance between the body-side seat 11s and the valve body side seat 20s towards the axis line C at the moment of stopping the movement corresponds to a full stroke of the needle 20 and corresponds to the stroke described above L2 . (Third embodiment)

[0225] The valve closing force transmission element (cup 50 ) according to the first embodiment has the cup shape with the cylindrical portion 51 and the circular plate part 52. On the other hand, a valve closing force transmission member according to the present embodiment has a circular plate shape defined by a circular plate portion 52 is configured in which the cylindrical section 51 is eliminated (see figure 44). Except for the configuration to be described below, the configuration of a fuel injection valve according to the present embodiment is the same as the configuration of the fuel injection valve according to the first embodiment.

[0226] In the first embodiment, in the cylindrical portion 51 a surface (core contact end surface 51a ) of the valve closing force transmission element with which the contact surface (second core contact surface 32b ) of the moving core 30 is in contact, trained. On the other hand, in the present embodiment, a surface of the circular plate portion functions 52 on the nozzle opening side as the core contact end face 52e (please refer figure 44) showing the moving core 30 touched. (Other embodiments)

[0227] The disclosure contained herein is not limited to the combinations of components and / or elements shown in the embodiments. The disclosure may have additional portions that may be added to the embodiments. The disclosure includes the omission of components and / or elements of the embodiments. The disclosure encompasses the interchange or combination of components and / or elements between one embodiment and another. For example, the fuel injector includes 1 according to the first embodiment, all configuration groups A , B , C , D and E, but can be a fuel injector with any combination of the configuration groups A , B , C , D and be E.

[0228] In the first embodiment, the temporary press fitting is performed once as in FIG figure 6, but the load measurement can be performed for each temporary press-fitting by performing the temporary press-fitting two or more times. According to the above configuration, the adjustment of the second adjustment load to the target value can be realized with high accuracy. In addition, since the stress is measured at each multiple of temporary press-fitting operations, the Young's modulus of the second spring member SP2 measured and the degree of press-fitting in this press-fitting process can be calculated with high accuracy.

[0229] At the in figure In the press-fitting process shown in FIG. 6, the second set load is measured in a state where the progress of the press-fitting is stopped and the press-fitting is finished, but the second set force may be measured during the press-fitting. In other words, the press-fitting is performed during the measurement of the second set load, and the press-fitting is stopped and completed when the measured second set load reaches the target value.

[0230] At the in figure 6, the second set load is measured while the cup is pressed 50 in the state of touching the needle, the movement of the moving core 30 restricts but the second setting load can be measured while the contact section 21 the needle 20 the movement of the moving core 30 restricts.

[0231] In the figure 12 communication grooves shown 32e are on the third core contact surface 32d in addition to the first core contact area 32c and to the second core contact surface 32b provided, but can on the third core contact surface 32d not be provided. Although the in figure 12 communication grooves shown 32e over the entire area of ​​the first core contact area 32c are provided in the radial direction, it suffices that the communication grooves 32e at least in a portion of the first core contact area 32c next to the second core contact area 32b are provided.

[0232] Although the in figure16 shown outer communication grooves 31e are arranged so that they do not interfere with the through holes 31a communicate, can the outer communication grooves 31e be arranged so that they are connected to the through holes 31a keep in touch. In the figure 19 communication grooves shown 32g are over the first core contact area 32c , the second core contact area 32b and the third core contact surface 32d provided, but cannot on the third core contact surface 32d be provided.

[0233] In the examples of figure 21, figure 22 and figure 23 are the communication grooves 32e eliminated, and instead of the communication grooves 32e are the connection openings 20c , the sliding surface communication grooves 20d and the second sliding surface communication grooves 32h intended. On the other hand, the fuel injector 1 two or more of the communication grooves 32e , the connection openings 20c , the sliding surface communication grooves 20d and the second sliding surface communication grooves 32h contain.

[0234] Although in an example from figure 22 the sliding surface communication grooves 20d in the needle 20 are provided, the sliding surface communication grooves in the transmission member-side sliding surface 51c (please refer figure 22) of the cup 50 , on which the needle 20 slides, are provided. In an example from figure 23 are the second sliding surface communication grooves 32h in the inner core 32 formed, but the second sliding surface communication groove may be in the surface of the needle 20 to be provided with the inner core 32 glides.

[0235] In an example from figure 24 become the main flow channels 20e for supplying the fuel to the valve closing contact surface 21b in the state of contact with the cup 50 through the ones in the needle 20 Grooves provided, but can be replaced by those in the cup 50 provided grooves are provided. In particular, the feed flow channel can be provided by grooves in the core contact end face 51a of the cylindrical section 51 to be provided.

[0236] In the first embodiment, the movable portion M in the radial direction at two points of the needle 20 buttressed, i.e. at the portion facing the inner wall surface 11c of the nozzle orifice body 11 (the needle point part) and the outer peripheral surface 51d of the mug 50 is facing. On the other hand, the movable section M are supported at two locations from the radial direction, namely, the outer peripheral surface of the movable core 30 and at the needle point portion.

[0237] In the first embodiment, there is the inner core 32 of a non-magnetic material but may be of a magnetic material. If the inner core 32 The inner core is made of a magnetic material 32 consist of a weakly magnetic material that is less magnetic than the outer core 31 . Likewise, the needle 20 and the guiding element 60 consist of a weakly magnetic material that is weaker than the outer core 31 .

[0238] In the first embodiment, the cup 50 between the first spring element SP1 and the moving core 30 inserted to realize a core boost structure in which the moving core 30 the needle 20 touched to start the valve opening operation when the moving core is moving 30 moved a predetermined distance. On the other hand, the mug can 50 can be eliminated, and a core boost structure can be used in which a third spring member, which is different from the first spring member SP1 differs, is provided and the moving core 30 is pressed by the third spring element in the direction of the nozzle opening.

[0239] In the first embodiment is to avoid a magnetic short circuit between the fixed core 13 and the main body 12 the non-magnetic element 14 between the solid core 13 and the main body 12 arranged. Instead of the non-magnetic element 14 can between the solid core 13 and the main body 12 a magnetic member having a shape with a magnetic choke portion for preventing the magnetic short circuit may be arranged. Alternatively, the non-magnetic element 14 eliminated and a magnetic choke section to prevent the magnetic short circuit in the fixed core 13 or in the main body 12 are formed.

[0240] The sleeve or sleeve 40 according to the first embodiment has a shape in which the connecting portion 42 on top of the storage section 43 (on the side opposite to the nozzle openings) and the cylindrical fitting portion 41 on top of the connector 42 extends. On the other hand, the sleeve 40 have a shape in which the connecting portion 42 under the storage section 43 (on the nozzle opening side) and the insertion cylindrical portion 41 further under the connection section 42 extends. The sleeve 40 can also be a hollow, annular ring that extends annularly around the needle 20 extends. In this case the upper surface of the ring supports the second spring element SP2 off, and the inner peripheral surface of the ring is in the press-fitting portion 23 press fitted.

[0241] The cup 50 according to the first embodiment, has the cup shape with the circular plate portion 52 and the cylindrical section 51 . On the other hand, the mug can 50 have a flat plate shape. In this case, the top surface (top) of the flat plate contacts the first spring member SP1 and the lower surface (bottom) of the flat plate the movable core 30 .

[0242] The support element 18 has the cylindrical shape according to the first embodiment, but may have a C-shaped cross-sectional shape in which a direction of the axis line C running slot is cylindrical.

[0243] The moving core 30 according to the first embodiment, the structure has two parts, i.e. the outer core 31 and the inner core 32 . The inner core 32 consists of a material with a higher hardness than the outer core 31 and has a surface covering the mug 50 and the guiding element 60 touched, as well as a surface with the needle 20 glides. On the other hand, the moving core 30 have a structure in which the inner core 32 is eliminated.

[0244] If the moving core 30 has the structure in which the inner core 32 is eliminated as described above, it is preferable that the contact surface of the movable core 30 holding the mug 50 and the guiding element 60 touched, and the sliding surface with the needle 20 slides are plated. A specific example of a coating applied to the contact surface is chromium. A specific example of a coating applied to the sliding surface is nickel-phosphorus.

[0245] The fuel injector 1 according to the first embodiment has the structure in which the movable core 30 with the one on the solid core 13 attached guide element 60 comes into contact or touches. On the other hand, the moving core may 30 the solid core 13 touch, with the guide member 60 is eliminated. In short, the inner core 32 can the guide element 60 touch or the inner core 32 can the solid core 13 touch in which the guide element 60is eliminated. Further, the structure can be applied in which the movable core 30 , in which the inner core 32 is abolished, the guiding element 60 touches, or the structure at which the moving core 30 , in which the inner core 32 is abolished, the solid core 13 , in which the guiding element 60 is abolished, touched.

[0246] In the case that the moving core 30 has the structure in which the inner core 32 is eliminated as described above corresponds to the surface of the movable core 30 on the side opposite the nozzle opening, which is the needle 20 touches, the first core contact surface 32c . In addition, corresponds to the structure in which the guide element 60 is eliminated as described above, the surface of the movable core 30 , which is the solid core 13 touches, the third core contact surface 32d.

[0247] In the first embodiment, the communication grooves 32e in the inner core section 32 provided that the guide element 60 touched. On the other hand, in the construction in which the guide element 60 is eliminated as described above, the communication grooves 32e in the inner core section 32 provided, of the solid core 13 touched or contacted. If the moving core 30 the structure has in which the inner core 32 is eliminated as described above are the communication grooves 32e in the movable core section 30 provided, of the solid core 13 touched.

[0248] The cup 50 according to the first embodiment slides in the direction of the axis line C , while he the inner peripheral surface of the guide member 60 touched. On the other hand, the mug can 50 be configured to move in the direction of the axis line C moves while leaving a predetermined gap with the inner peripheral surface of the guide member 60 Are defined.

[0249] In the first embodiment, the inner peripheral surface of the second spring member SP2 through the connecting section 42 the sleeve 40 guided. On the other hand, the outer peripheral surface of the second spring element SP2 through the outer core 31 be led.

[0250] In the first embodiment, one end of the second spring member SP2 through the moving core 30 and the other end of the second spring element SP2 through the one on the needle 20 attached sleeve 40 supported. On the other hand, the sleeve 40 be eliminated, and the other end of the second spring element SP2 can through the main body 12 get supported.

[0251] While the present disclosure has been described with reference to embodiments thereof, it is to be understood that the disclosure is not limited to the embodiments and constructions. To the contrary, the present disclosure is intended to cover various modifications and equivalent arrangements. In addition, the various elements shown in various combinations and configurations, which are exemplary, as well as other combinations and configurations, including more, fewer, or only a single element, are also included within the spirit and scope of the present disclosure. QUOTES INCLUDED IN DESCRIPTION

[0000] This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Patent Literature Cited

[0000] JP 2017189886

[0001] JP 2018169995

[0001] JP 2013104340A

[0006]

Claims

[1] Having a fuel injector: a valve body (20) that opens or closes a nozzle opening (11a) for injecting a fuel; a solid core (13) which generates a magnetic attraction force when a coil (17) is excited; a movable core (30) which is attracted and moved by the fixed core, wherein the movable core comes into contact with a valve opening contact surface (21a) of the valve body when the movable core is moved by a predetermined distance to cause the valve body to initiate a valve opening operation; a spring element (SP1) that is elastically deformed by the valve opening process of the valve body and exerts an elastic valve closing force that causes the valve body to perform a valve closing process; and a valve closing force transmission element (50) which transmits the elastic valve closing force to the valve body by contacting a valve closing contact surface (21b) of the valve body, wherein the valve closing force transmission element, together with the valve closing force transmission element, is in contact with the valve closing contact surface over a predetermined distance at the beginning of the movement of the movable core, and the valve closing force transmission element or the valve body has a supply flow channel (20e, 52d, 210e) that supplies the fuel to the valve closing contact surface which is in a state in which it is in contact with the valve closing force transmission element. [2] Fuel injection valve according to claim 1, wherein the supply flow channel is formed by a groove provided on the valve closing contact surface of the valve body. [3] Fuel injection valve according to claim 2, wherein the valve closing contact surface is formed in an area that extends in a ring shape in the direction of movement of the movable core, and the supply current channel has a main current channel (20e, 210e) that extends across the area to connect an annular inner and an annular outer of the area. [4] Fuel injector according to claim 2, wherein the valve body has an internal passage (20a) through which the fuel flows to the nozzle opening, an outer circumferential surface of the valve body acts as the wall surface of a passage through which the fuel flows to the nozzle opening, and the supply flow channel has a main flow channel (20e, 210e) which extends to connect an inner circumferential surface defining the inner passage and the outer circumferential surface of the valve body. [5] Fuel injector according to claim 3 or 4, wherein the main flow channel is one of a plurality of main flow channels and The majority of the main flow channels are arranged at regular intervals in the circumferential direction when viewed in the direction of movement of the moving core. [6] Fuel injection valve according to one of claims 3 to 5, wherein the supply flow channel has a branch flow channel (205) branching off from the main flow channel. [7] Fuel injection valve according to claim 6, wherein the branch flow channel has a shape which extends in a ring shape in the direction of movement of the movable core. [8] Fuel injection valve according to any one of claims 3 to 7, wherein the main flow channel has a straight section (201) which extends linearly in the direction of movement of the moving core, and an inlet section (202) which is connected to the straight section and has a fuel inlet opening (203), and The cross-sectional area of ​​the inlet channel has a shape that is larger in area than the cross-sectional area of ​​the straight channel. [9] Fuel injection valve according to any one of claims 2 to 8, wherein a depth dimension (201h) of the groove forming the supply flow channel is larger than a width dimension (201w) of the groove.