WO2011142258A1

WO2011142258A1 - Electromagnetic fuel-injection valve

Info

Publication number: WO2011142258A1
Application number: PCT/JP2011/060244
Authority: WO
Inventors: 昌輝森谷; 知之大村; 茂猪又; 岡本　淳
Original assignee: 株式会社ケーヒン
Priority date: 2010-05-14
Filing date: 2011-04-27
Publication date: 2011-11-17
Also published as: JP5623784B2; EP2570648A1; MX2012013236A; CN102893016B; JP2011241701A; EP2570648B1; CN102893016A; EP2570648A4

Abstract

In the disclosed electromagnetic fuel-injection valve: a non-magnetic or weakly magnetic guide bush (19) is affixed at the inner periphery of an immobile core (6); the front end of the guide bush (19) protrudes from the suction surface (6a) of the immobile core (6); during excitation of a coil (37), by means of a mobile core (16) being caused to contact the front end of the guide bush (19), the opening boundary of a valve body (15) is defined, and an air gap (g) is formed between the immobile core (6) and the mobile core (16); and a sliding member (20) that is slidably borne at the inner peripheral surface of the guide bush (19) is provided to a valve assembly (V). As a result, a structure-simple electromagnetic fuel injection valve is provided wherein the opening/closing postures of the valve body can be effectively stabilized, and moreover at the time of demagnetization of the coil, valve closing responsiveness can be favorably obtained.

Description

Electromagnetic fuel injection valve

The present invention includes a valve housing having a conical valve seat at one end, a fixed core having a hollow portion connected to the other end of the valve housing and serving as a fuel flow path, and a suction surface of the fixed core. A movable core, a valve body cooperating with the valve seat, a valve assembly including a stem integrally connecting the fixed core and the valve body, a valve spring for biasing the valve body in a valve closing direction, A guide portion that is disposed on an outer periphery of the fixed core and includes a coil that attracts the movable core to the fixed core by excitation to open the valve body, and slidably supports a rear end portion of the valve assembly. The present invention relates to an improvement in an electromagnetic fuel injection valve provided on the fixed core.

Such an electromagnetic fuel injection valve is already known as disclosed in Patent Document 1.

Japanese Unexamined Patent Publication No. 2008-31853

In such an electromagnetic fuel injection valve, the support span of the valve assembly can be set longer than the distance between the valve seat and the fixed core, effectively preventing the valve assembly from falling down and opening and closing the valve body. There is an advantage that can be effectively stabilized.

The present invention provides an electromagnetic fuel injection valve having a simple structure that can improve the valve closing response by accelerating the elimination of the residual magnetism in the fixed core and the movable core when demagnetizing the coil while ensuring the above advantages. The purpose is to do.

In order to achieve the above object, the present invention provides a valve housing having a conical valve seat at one end, a fixed core having a hollow portion connected to the other end of the valve housing and serving as a fuel flow path, A movable core opposed to the suction surface of the core, a valve body that cooperates with the valve seat, a valve assembly that integrally connects the fixed core and the valve body, and the valve body in the valve closing direction. A valve spring for biasing, and a coil disposed on the outer periphery of the fixed core and attracting the movable core to the fixed core by excitation to open the valve body, and a rear end portion of the valve assembly is In an electromagnetic fuel injection valve in which a guide portion that is slidably supported is provided on the fixed core, a non-magnetic or weak magnetic guide bush is fixedly provided on the inner periphery of the fixed core as the guide portion. The front end of the guide bush is the suction surface of the fixed core When the coil is excited, the movable core is brought into contact with the front end of the guide bush to define the valve opening limit of the valve body, and an air gap is formed between the fixed core and the movable core. A first feature is that the valve assembly is provided with a sliding member that is slidably supported on the inner peripheral surface of the guide bush. The guide bush corresponds to a second guide bush 19 in an embodiment of the present invention described later.

In addition to the first feature, the present invention has a second feature that the hardness of the guide bush is set higher than that of the fixed core.

Furthermore, in addition to the first feature, the present invention has a third feature that the hardness of the guide bush and the sliding member is set to be substantially equal.

Furthermore, in addition to the first or third feature, the present invention further comprises forming the outer peripheral surface of the sliding member as a spherical surface having a center on the central axis of the valve assembly, A fourth feature is that the line is always in line contact with the inner peripheral surface of the bush.

In addition to the first feature of the present invention, the outer peripheral surface of the valve body is formed into a spherical surface having a center on the central axis of the valve assembly, and the guide for slidably supporting the valve body. A portion is formed in the valve housing, and the outer peripheral surface of the valve body is always in line contact with the inner peripheral surface of the guide portion. The guide portion corresponds to a first guide bush 18 in an embodiment of the present invention described later.

Furthermore, in the present invention, in addition to any of the first, third and fourth features, a flat surface which defines a fuel flow path between the guide bushes is formed on the outer peripheral surface of the sliding member. Is a sixth feature.

Furthermore, in the present invention, in addition to any of the first, third to sixth features, a seventh aspect is that the rear end surface of the sliding member is formed as a spring seat supporting the front end of the valve spring. Features.

Furthermore, in addition to the seventh feature of the present invention, the sliding member is fitted and fixed to a support shaft protruding from the rear end surface of the movable core, and this support shaft is connected to the valve spring. The eighth feature is that the sliding member protrudes from the spring seat so as to be fitted to the inner periphery.

According to the first feature of the present invention, the guide bush fixed to the inner periphery of the fixed core is made of a non-magnetic or weak magnetic material, and its front end protrudes from the suction surface of the fixed core, so that the coil At the time of excitation, the valve opening limit of the valve body is defined by bringing the movable core into contact with the front end thereof, and an air gap is formed between the fixed core and the movable core. While ensuring a long support span of the valve assembly, it supports the sliding member to stabilize the opening and closing posture of the valve assembly, and closes the coil assembly by avoiding direct contact between the movable core and the fixed core during coil excitation. It also has a function of improving valve responsiveness, and it is possible to achieve both stabilization of the fuel injection flow characteristic of the electromagnetic fuel injection valve and simplification of the structure.

According to the second feature of the present invention, since the guide bush has a high hardness of the fixed core, the wear resistance of the guide bush is improved, and the sliding friction coefficient is stabilized along with the opening / closing posture of the valve assembly over a long period of time. This can contribute to stabilization of the fuel injection flow rate characteristic of the electromagnetic fuel injection valve.

According to the third feature of the present invention, since the hardness of the guide bush and the sliding member is set to be substantially equal, both wear resistance is improved, and the open / close posture of the valve assembly is more stable over a long period of time. Can be made.

According to the fourth aspect of the present invention, the outer peripheral surface of the sliding member is formed into a spherical surface having a center on the central axis of the valve assembly, and the sliding member is always on the inner peripheral surface of the guide bush. By making line contact, the valve assembly can be operated lightly without increasing the sliding resistance, even if the valve assembly is tilted due to manufacturing errors in each part.

According to a fifth aspect of the present invention, the outer peripheral surface of the valve body is formed into a spherical surface having a center on the central axis of the valve assembly, and the guide portion for slidably supporting the valve body is provided in the valve The valve assembly is formed on the housing, and the outer peripheral surface of the valve body is always in line contact with the inner peripheral surface of the guide portion. The solid body can be operated lightly, and the valve body can always be properly seated on the valve seat to reliably close the valve.

According to the sixth aspect of the present invention, the fuel flow path can be easily formed around the sliding member by plane processing on the outer peripheral surface of the sliding member, and the fuel passing through the fuel flow path The sliding surfaces of the sliding member and the guide bush can be effectively lubricated, which can contribute to the improvement of their wear resistance.

According to the seventh feature of the present invention, the sliding member having a higher hardness than the fixed core serves as a spring seat that supports the front end of the valve spring, so that a wear-resistant spring seat can be obtained.

According to the eighth feature of the present invention, the support shaft protruding from the rear end surface of the movable core plays a role of fixing the sliding member to the movable core and is fitted to the inner periphery of the front end of the valve spring. It plays the role of an expansion / contraction guide that prevents buckling of the valve spring, and can contribute to stabilization of the expansion / contraction operation of the valve spring, and further stabilization of the opening / closing operation of the valve assembly.

FIG. 1 is a vertical side view of an engine electromagnetic fuel injection valve according to a first embodiment of the present invention. (First embodiment) FIG. 2 is an enlarged view of part 2 of FIG. (First embodiment) 3 is a cross-sectional view taken along line 3-3 of FIG. (First embodiment) 4 is a cross-sectional view taken along line 4-4 of FIG. (First embodiment) 5 is a cross-sectional view taken along line 5-5 of FIG. (First embodiment) FIG. 6 is a diagram corresponding to FIG. 2, showing a second embodiment of the present invention. (Second embodiment)

I ... Fuel injection valve V ... Valve assembly Y ... Central axis 2 of valve assembly ... Valve housing 6 ... Fixed Core 6a... Fixed core suction surface 6b... Fixed core hollow portion 8... Valve seat 15... Valve body 16. .... Stem 18 ... Guide part (first guide bush)
19 ... Guide bush (second guide bush)
20... Sliding member 23... Fuel flow path 26... Fuel flow path 29... Support shaft 31. Spring

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, the first embodiment of the present invention shown in FIGS. 1 to 5 will be described. 1 and 2, the cylinder head 1 of the engine is provided with a mounting hole 1b that opens into the combustion chamber 1a, and an electromagnetic fuel injection valve I is mounted in the mounting hole 1b. The fuel injection valve I can inject fuel toward the combustion chamber 1a.

The valve housing 2 of the fuel injection valve I includes a valve seat member 3, a magnetic cylinder 4 coaxially coupled to the rear end of the valve seat member 3, and a coaxial coupling to the rear end of the magnetic cylinder 4. The nonmagnetic cylindrical body 5 is made up of. A fixed core 6 is coaxially coupled to the rear end of the nonmagnetic cylindrical body 5, and a fuel inlet cylinder 7 is coaxially connected to the rear end of the fixed core 6. The fixed core 6 has a hollow portion 6 b communicating with the inside of the fuel inlet cylinder 7. A fuel filter 14 is attached to the inlet of the fuel inlet cylinder 7.

The valve seat member 3 includes a small diameter cylindrical portion 3a having a front end wall and a flange portion 3b formed at the rear end of the small diameter cylindrical portion 3a. The front end wall of the small diameter cylindrical portion 3a has a conical shape. A valve seat 8, a valve hole 9 connected to the front end of the valve seat 8, and a fuel injection hole 10 connected to the valve hole 9 and opened at the front end surface of the small diameter cylindrical portion 3 a are formed.

The magnetic cylinder 4 includes a thin tube portion 4a and a thick tube portion 4b connected to the rear end of the thin tube portion 4a. The thick tube portion 4b has an inner diameter of the thin tube portion 4a. The outer diameter is smaller than that of the thin cylindrical portion 4a. The shim 11 and the flange portion 3b of the valve seat member 3 are sequentially fitted to the inner peripheral surface of the thin-walled cylinder portion 4a, and the flange portion 3b is liquid-tightly welded to the thin-walled cylinder portion 4a.

The thick-walled cylindrical portion 4b has an annular protrusion 12 that protrudes from the rear end surface on the inner peripheral side, and the nonmagnetic cylindrical body 5 is abutted against the tip of the annular protrusion 12 and is liquid-tightly welded. The thick cylindrical portion 4b and the nonmagnetic cylindrical body 5 are formed so that their inner peripheral surfaces are continuous with each other.

The collar fixing core 6 has an annular recess 13 on the outer periphery of the front end, and the rear end of the nonmagnetic cylindrical body 5 is fitted into the annular recess 13 and is welded in a liquid-tight manner. The fixed core 6 and the nonmagnetic cylindrical body 5 are formed so that their outer peripheral surfaces are continuous.

The valve assembly V is accommodated in the valve housing 2 extending from the valve seat member 3 to the nonmagnetic cylindrical body 5. The valve assembly V includes a valve body 15 that opens and closes the valve hole 9 in cooperation with the valve seat 8, and a magnetic cylinder body 4 and a nonmagnetic cylinder body 5 that face the suction surface 6 a at the front end of the fixed core 6. The movable core 16 is arranged on the inner side of the valve body 15 and the stem 17 is integrally connected between the valve body 15 and the movable core 16.

The rod stem 17 is formed to have a smaller diameter than the valve body 15 and has a length protruding from the rear end surface of the movable core 16 through the central portion of the movable core 16. The stem 17 has a connecting flange 17 a that contacts the front end of the movable core 16, and the connecting flange 17 a is abutted against the front end surface of the movable core 16. The stem 17 is integrally connected to the valve body 15 by welding.

2 and 3, a cylindrical first guide bush 18 that slidably supports the valve body 15 is press-fitted into the inner peripheral surface of the front end portion of the small diameter cylindrical portion 3a. The outer peripheral surface of the valve body 15 is formed in a spherical surface having a center on the central axis Y of the valve assembly V so as to always come into line contact with the inner peripheral surface of the first guide bush 18. A cylindrical fuel flow path 21 is defined between the first guide bush 18 and the stem 17, and a fuel flow path 22 is defined between the first guide bush 18 and the outer peripheral surface of the valve body 15. A plurality of flat surfaces 25 are formed. Therefore, the first guide bush 18 allows the passage of fuel while guiding the opening / closing operation of the valve body 15.

A fitting recess 28 that opens to the suction surface 6a is formed on the inner peripheral surface of the heel fixed core 6, and a cylindrical second guide bush 19 is fixed to the fitting recess 28 by press-fitting. The second guide bush 19 is formed such that its inner peripheral surface is continuous with the inner peripheral surface of the fixed core 6. On the other hand, a portion of the stem 17 protruding rearward of the movable core 16 is configured as a support shaft 29 that enters into the second guide bush 19, and the inner peripheral surface of the second guide bush 19 is formed on the support shaft 29. A sliding member 20 that is slidably supported is fitted and fixed by welding, caulking, or the like. Therefore, the movable core 16 is sandwiched between the connecting flange 17a and the sliding member 20.

The outer peripheral surface of the sliding member 20 is formed in a spherical surface having a center on the central axis Y of the valve assembly V so as to be in line contact with the inner peripheral surface of the second guide bush 19.

Further, the front end surface of the second guide bush 19 protrudes from the suction surface 6 a of the fixed core 6 by a predetermined length, and the rear end surface of the movable core 16 is brought into contact with the front end surface of the second guide bush 19. The valve opening limit of the valve body 15 is regulated. Further, when the movable core 16 abuts against the second guide bush 19, an air gap g corresponding to the forward protruding length of the second guide bush 19 from the fixed core 6 is provided between the opposed surfaces of the movable core 16 and the fixed core 6. Is to be formed. The second guide bush 19 and the sliding member 20 are made of a nonmagnetic or weak magnetic material having a higher hardness than the fixed core 6, for example, martensitic stainless steel. Accordingly, the hardness of the second guide bush 19 and the sliding member 20 are made substantially equal.

By the two-point support of the valve assembly V by the first and

second guide bushes

18 and 19, the outer peripheral surface of the movable core 16 and the inner peripheral surfaces of the magnetic cylindrical body 4 and the nonmagnetic cylindrical body 5 are disposed between them. A cylindrical gap 30 for preventing the contact is secured.

As shown in FIG. 4, a plurality of flat surfaces 26 are formed on the outer peripheral surface of the sliding member 20 so as to define the fuel flow path 23 between the second guide bush 19. The movable core 16 is provided with a plurality of through holes 24 penetrating vertically through the movable core 16.

1 and 2, the rear end surface of the sliding member 20 is an annular spring seat 31, and is fitted into the hollow portion 6b of the fixed core 6 and fixed by caulking from the side. A valve spring 33 that biases the movable core 16 toward the valve closing side of the valve body 15 is contracted between the spring and the seat 31. Therefore, the spring seat 31 supports the front end of the valve spring 33. At that time, the set load of the valve spring 33 is adjusted by the fitting depth of the retainer 32 to the fixed core 6. It is fixed to the fixed core 6. Since the sliding member 20 is harder than the fixed core 6 as described above, the spring seat 31 at the rear end can be made highly wear resistant.

The support shaft 29 protrudes from the spring seat 31 of the sliding member 20 and is fitted to the inner periphery of the front end portion of the valve spring 33 so that the protruding portion serves as an expansion / contraction guide for the valve spring 33.

A coil assembly 35 is fitted on the outer peripheral surface from the annular protrusion 12 of the magnetic cylindrical body 4 to the fixed core 6. The coil assembly 35 includes a bobbin 36 fitted to the outer peripheral surface and a coil 37 wound around the bobbin 36, and a front end of a coil housing 38 surrounding the coil assembly 35 is a magnetic cylindrical body 4. An annular yoke 39 is connected to the rear end surface of the fixed core 6 by welding or the like, and is connected to the outer peripheral surface of the fixed core 6 by welding or the like.

A synthetic resin coating layer 40 is molded on the outer peripheral surface from the rear end of the magnetic cylinder 4 to the middle of the fuel inlet cylinder 7. On the outer periphery of the rear portion of the covering layer 40, a connector housing portion 41 is formed in a notch shape, and a connector 42 connected to the coil 37 is disposed in the connector housing portion 41, and a side opening portion of the connector housing portion 41 is opened. The synthetic resin cover 43 to be closed is locked to the covering layer 40. The connector 42 is connected to an external conducting wire 44 for power feeding.

Next, the operation of the first embodiment will be described.

In a state where the coil coil 37 is demagnetized, the valve assembly V is pressed forward by the urging force of the valve spring 33, the valve body 15 is seated on the valve seat 8, and the valve hole 9 is closed.

When the coil 37 is excited by energization, the magnetic flux generated by the coil 37 sequentially travels through the fixed core 6, the coil housing 38, the magnetic cylinder 4 and the movable core 16, and the movable core 16 of the valve assembly V is set to the valve spring 33 by the magnetic force. The valve body 15 is separated from the valve seat 8 by being sucked by the fixed core 6 against the load, so that the valve hole 9 is opened. Therefore, the fuel pressure-fed from the fuel pump (not shown) to the fuel inlet cylinder 7 passes through the pipe-shaped retainer 32, the hollow portion 6b of the fixed core 6, the fuel flow path 23 around the sliding member 20, and the through hole of the movable core 16. 24, the inside of the valve housing 2, the fuel passage 21 inside the first guide bush 18, the fuel passage 22 around the valve body 15, the valve seat 8, and the valve hole 9 in this order from the fuel injection hole 10 to the combustion chamber of the engine Directly injected.

By the way, the valve assembly V includes a valve body 15 and a sliding member 20 provided at the front end portion and the rear end portion thereof, respectively, the first guide bush 18 of the valve seat member 3 and the second guide bush 19 of the fixed core 6. Therefore, the support span of the valve assembly V can be set longer than the distance between the valve seat 8 and the fixed core 6, and the opening and closing posture of the valve assembly V can be stabilized. Therefore, it is possible to prevent the fuel injection flow rate characteristic from being distorted. Moreover, since the second guide bush 19 is made of a nonmagnetic or weak magnetic material having a hardness higher than that of the fixed core 6, the second guide bush 19 has high wear resistance, stabilizes the sliding friction coefficient of the valve assembly V for a long period of time, and The fuel injection flow rate characteristic of the injection valve I can be further stabilized.

Further, since the hardness of the second guide bush 19 and the sliding member 20 are set to be substantially equal, the wear resistance of both 19 and 20 is improved, and the open / close posture of the valve assembly V is further stabilized over a long period of time. be able to.

Further, the outer peripheral surfaces of the valve body 15 and the sliding member 20 are spherical surfaces having a center on the central axis Y of the valve assembly V and in line contact with the inner peripheral surfaces of the first and

second guide bushes

18 and 19, respectively. Since it is formed, the valve assembly V can be operated lightly without increasing the sliding resistance even if the valve assembly V is inclined due to manufacturing errors of each part, and the valve body 15 is appropriately fitted to the valve seat 8. The valve can be securely closed.

Further, when the coil 37 is excited, the movable core 16 of the valve assembly V abuts against the front end surface of the second guide bush 19 protruding from the suction surface of the fixed core 6, thereby defining the valve opening limit of the valve body 15. The movable core 16 faces the suction surface 6a of the fixed core 6 with the air gap g interposed therebetween, so that direct contact with the fixed core 6 is avoided, so that the second guide bush 19 is nonmagnetic or weakly magnetic. In other words, when the coil 37 is demagnetized, the residual magnetism between the

cores

6 and 16 disappears quickly, and the valve closing response of the valve body 15 can be enhanced.

As described above, the second guide bush 19 supports the sliding member 20 to stabilize the opening / closing posture of the valve assembly V, and avoids direct contact between the movable core 16 and the fixed core 6 when the coil 37 is excited. As a result, it also has the function of improving the valve closing response, and it is possible to achieve both stabilization of the fuel injection characteristics and simplification of the structure.

A plurality of flat surfaces 25 that define a fuel flow path 22 are formed between the valve body 15 and the first guide bush 18, and a second guide bush is formed on the outer periphery of the sliding member 20. Since a plurality of flat surfaces 26 that define the fuel flow path 23 are formed between the valve body 15 and the sliding member 20, the valve body 15 and the sliding member 20 are flattened on the outer peripheral surfaces of the valve body 15 and the sliding member 20. The

fuel flow paths

22 and 23 can be easily formed around the valve body 15, the first guide bush 18, the sliding member 20 and the second guide bush 19 by the fuel passing through the

fuel flow paths

22 and 23. Each sliding surface can be effectively lubricated and can contribute to improvement of their wear resistance.

Further, the support shaft 29 protrudes from the spring seat 31 of the sliding member 20 and is fitted to the inner periphery of the front end portion of the valve spring 33 so that this becomes an expansion / contraction guide of the valve spring 33. In addition to being fixed to the movable core 16, it also serves as an expansion / contraction guide for preventing the buckling of the valve spring 33, stabilizing the expansion / contraction operation of the valve spring 33, and thus stabilizing the opening / closing operation of the valve assembly V. Can contribute.

Next, a second embodiment of the present invention shown in FIG. 6 will be described.

In the second embodiment, in the valve assembly V, the stem 17 is integrally formed on the front end surface of the movable core 16 and the support shaft 29 is integrally formed on the rear end surface with the same material as the movable core 16. The sliding member 20 is fitted and fixed, and the other configuration is the same as that of the previous embodiment. Therefore, in FIG. 6, parts corresponding to those of the previous embodiment are denoted by the same reference numerals and are duplicated. Description is omitted.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the fuel injection valve V can be configured to inject fuel into the engine intake system. Further, a guide hole may be formed in the valve seat member 3 in place of the first guide bush 18 that slidably supports the valve body 15.

Claims

A fixed housing (6) having a valve housing (2) having a conical valve seat (8) at one end and a hollow portion (6b) connected to the other end of the valve housing (2) and serving as a fuel flow path A movable core (16) opposed to the suction surface (6a) of the fixed core (6), a valve body (15) cooperating with the valve seat (8), and these fixed core (6) and valve body ( 15) a valve assembly (V) comprising a stem (17) integrally connecting the valve body (15), a valve spring (33) for urging the valve body (15) in a valve closing direction, and a fixed core (6) A coil (37) that is arranged on the outer periphery and opens the valve element (15) by attracting the movable core (16) to the fixed core (6) by excitation, and the rear of the valve assembly (V). In the electromagnetic fuel injection valve in which the guide portion for slidably supporting the end portion is provided in the fixed core (6),
A non-magnetic or weak magnetic guide bush (19) is fixed as an inner periphery of the fixed core (6), and the front end of the guide bush (19) is attached to the suction surface of the fixed core (6). When the coil (37) is excited, the movable core (16) is brought into contact with the front end of the guide bush (19) to define the valve opening limit of the valve element (15). In addition, an air gap (g) is formed between the fixed core (6) and the movable core (16), and is slidably supported on the inner peripheral surface of the guide bush (19). An electromagnetic fuel injection valve characterized in that a member (20) is provided in the valve assembly (V).
The electromagnetic fuel injection valve according to claim 1,
An electromagnetic fuel injection valve characterized in that the hardness of the guide bush (19) is set higher than that of the fixed core (6).
The electromagnetic fuel injection valve according to claim 1,
An electromagnetic fuel injection valve characterized in that the guide bush (19) and the sliding member (20) have substantially the same hardness.
The electromagnetic fuel injection valve according to claim 1 or 3,
An outer peripheral surface of the sliding member (20) is formed into a spherical surface having a center on the central axis (Y) of the valve assembly (V), and the sliding member (20) is formed on the guide bush (19). An electromagnetic fuel injection valve that is always in line contact with an inner peripheral surface.
The electromagnetic fuel injection valve according to claim 1,
An outer peripheral surface of the valve body (15) is formed into a spherical surface having a center on the central axis (Y) of the valve assembly (V), and a guide portion (slidably supporting the valve body (15)) An electromagnetic fuel injection valve characterized in that 18) is formed in the valve housing (2), and the outer peripheral surface of the valve body (15) is always in line contact with the inner peripheral surface of the guide portion (18).
The electromagnetic fuel injection valve according to any one of claims 1, 3, and 4,
An electromagnetic fuel injection valve characterized in that a flat surface (26) defining a fuel flow path (23) is formed between the guide bushes (19) on the outer peripheral surface of the sliding member (20).
The electromagnetic fuel injection valve according to any one of claims 1, 3 to 6,
An electromagnetic fuel injection valve characterized in that a rear end surface of the sliding member (20) is formed on a spring seat (31) supporting the front end of the valve spring (33).
The electromagnetic fuel injection valve according to claim 7,
The sliding member (20) is fitted and fixed to a support shaft (29) protruding from the rear end surface of the movable core (16), and this support shaft (29) is connected to the valve spring (33). An electromagnetic fuel injection valve characterized by protruding from a spring seat (31) of the sliding member (20) so as to be fitted to the inner periphery of the sliding member (20).