JP2022029162A - Connecting tube for electromagnetic type fuel injection valve - Google Patents

Abstract

To provide a connecting tube for a fuel injection valve, whose tube body is cylindrically formed with a slit, a first connection part for movable core is provided at an end, and a second connection part for a valve body is provided at the other end, capable of easily discriminating whether a connecting tube end part is the first connection part or the second connection part while restricting tangle among the connecting tubes.SOLUTION: A tube body 13 includes: a first side end surface S1 providing a first convexo-concave pair P1 consisting of a first convex part a1 and a first concave part b1 arranged outside of the axis direction of the first convex part, at each of a first specified position 13e1 near a first connection part 131 of the tube body 13 and a second specified position 13e2 near a second connection part 132; and a second side end surface S2 providing a second convexo-concave pair P2 consisting of a second concave part b2 and a second convex part a arranged outside of the axis direction of the second concave part, at each of the first specified position 13e1 and the second specified position 13e2. The first concave part b1 and the first convex part a1 of the first convexo-concave pair P1 are arranged respectively facing the second convex part a2 and the second concave part b2 of the second convexo-concave pair P2 corresponding to the first convexo-concave pair P1.SELECTED DRAWING: Figure 3

Description

The present invention includes a fixed core fixed to the valve housing, a coil surrounding the fixed core, a movable core slidably housed in the valve housing and sucked into the fixed core when the coil is energized, and a valve housing. The present invention relates to a connecting pipe used for connecting a movable core and a valve body in an electromagnetic fuel injection valve provided with a valve body capable of opening and closing a valve hole provided at the front end portion of the above.

The connecting pipe for the fuel injection valve as described above is provided with a pipe body that is concentrically arranged in the valve housing and extends linearly, and the pipe body has a single slit parallel to the central axis of the pipe body. It is formed in a cylindrical shape over the entire length direction, and the first connecting part to which the movable core can be connected is attached to one end in the axial direction of the tube body, and the valve body can be connected to the other end in the axial direction. A structure in which two coupling portions are provided is known, for example, in Patent Document 1.

Japanese Unexamined Patent Publication No. 8-261093

In the connecting pipe of Patent Document 1, the convex portion is located on the first side end surface of the first and second side end surfaces facing each other with a slit in the circumferential direction, and the convex portion is located closer to the first and second joint portions. In addition to the arrangement, the concave portion facing the convex portion is arranged on the second end surface. According to the special provision of the convex portions and the concave portions, even when a large number of connecting pipes are collectively housed in the container (for example, when polishing the barrel of the connecting pipes) before the assembly process, the connecting pipes can be combined into one connecting pipe. It is possible to suppress the occurrence of a situation in which the connecting pipes are entangled with each other by the side end edges of other connecting pipes entering through the slit.

By the way, in the above-mentioned conventional connecting pipe, since the appearances of the first and second connecting portions existing at both ends are relatively similar, even if the outer end of the connecting pipe and the corresponding convex portion are in the axial distance L3. Even if there is a difference in L4, there is a problem that it is difficult to easily and accurately determine whether both ends of the connecting pipe are the first or second coupling portion. There is a risk that the body will be erroneously assembled to the connecting pipe and the assembly quality and workability will deteriorate.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a connecting pipe for an electromagnetic fuel injection valve which can solve the above-mentioned problems of the conventional structure with a simple structure.

In order to achieve the above object, the present invention has a fixed core fixed to the valve housing, a coil surrounding the fixed core, and the fixed core slidably housed in the valve housing when the coil is energized. An electromagnetic fuel injection valve comprising a movable core sucked into the core and a valve body provided at the front end of the valve housing that can open and close the valve hole, in order to connect the movable core and the valve body. A connecting pipe to be used, wherein the valve housing is provided with a pipe body that is concentrically arranged with the valve housing and extends linearly, and the pipe body has a single slit parallel to the central axis of the pipe body in the longitudinal direction. It is formed in a cylindrical shape over the entire area, and the first coupling portion to which the movable core can be coupled can be bonded to one end in the axial direction of the tube body, and the valve body can be coupled to the other end in the axial direction. In the case where the second coupling portion is provided, the first side end surface of the first and second side end faces of the pipe body facing each other with the slit in the circumferential direction is the first convex portion and its axis. One of the first concave-convex pair consisting of the first concave portions arranged on the outer side in the direction is provided at the first predetermined portion near the first joint portion and the second predetermined portion near the second joint portion of the pipe body, respectively. The second side end surface has a second concave-convex pair composed of a second concave portion and a second convex portion arranged on the outward side in the axial direction thereof at the first predetermined portion and the second predetermined portion, respectively. The first concave portion and the first convex portion of each of the first concave-convex pairs are arranged so as to face the second convex portion and the second concave portion of the second concave-convex pair corresponding to the first concave-convex pair. The first feature is that it is done.

Further, in the present invention, in addition to the first feature, the first and second convex portions each have a top surface parallel to the center line of the slit at the tip thereof, and the first unevenness pair and the first unevenness pair. In the second concavo-convex pair corresponding to the first concavo-convex pair, the circumferential distance between the first convex portion and the apex surface of the two convex portions is set to be smaller than the plate thickness of the tube body. This is the second feature.

Further, in the present invention, in addition to the first feature, in the middle of the first and second predetermined portions of the pipe body, the first side end surface is an axially adjacent first intermediate convex portion and a first intermediate. While having at least one pair of first intermediate unevenness composed of concave portions, the second side end surface is formed from a second intermediate concave portion facing the first intermediate convex portion and a second intermediate convex portion facing the first intermediate concave portion. The third feature is that it has at least one pair of second intermediate unevenness.

Further, in the present invention, in addition to the first feature, in the first and second predetermined portions, the pair of the first unevenness pairs is the axial outer end of the first concave portion and the corresponding pipe main body. The axial distance between the two convex portions is set to be the same, and the pair of the second unevenness pairs includes the axial outer end of the second convex portion and the corresponding outer end of the pipe body. The fourth feature is that the axial distance between the two is set to be the same.

In the present invention, the "first predetermined portion closer to the first joint portion of the pipe body" means a portion closer to the first joint portion side from the axial center position of the pipe body. Further, the "second predetermined portion closer to the second joint portion of the pipe body" means a portion closer to the second joint portion side from the axial center position of the pipe body.

The "first predetermined portion" is a bisected position (that is, a first position) of the distance between the axial center position of the pipe body and the outer end on the first joint portion side, as in the embodiment described later. It is desirable that the portion is closer to the outer end on the side of the first joint than the bisected position), but in the present invention, the portion is closer to the central position than the first bisected position. May be good. Further, as the "second predetermined portion", as in the embodiment described later, the bisected position of the distance between the axial center position of the pipe body and the outer end on the second coupling portion side (that is, the second two). It is desirable that the portion is closer to the outer end on the side of the second joint than the equally divided position), but in the present invention, even if the portion is closer to the central position than the second bisected position. good.

According to the first feature of the present invention, the first side end face of the first and second side end faces facing each other with a slit in the circumferential direction is the first convex portion and the outside of the axial direction thereof. A first concave-convex pair consisting of a first concave portion arranged on the side is provided at a first predetermined portion near the first joint portion and a second predetermined portion near the second joint portion of the pipe body, while the second side end surface is provided. Has a second concave-convex pair consisting of a second concave portion and a second convex portion arranged on the outward side in the axial direction thereof at the first predetermined portion and the second predetermined portion, respectively. The first concave portion / first convex portion of the pair is arranged so as to face the second convex portion / second concave portion of the second concave-convex pair corresponding to the first concave-convex pair. Therefore, these convex portions and concave portions can prevent the side end edges of the other connecting pipes from entering through the slit in one connecting pipe even when a large number of connecting pipes are collectively housed in the container, and the connecting pipes can be prevented from entering each other. It is possible to suppress the occurrence of entangled situations.

Further, according to the special provision of the first and second concavo-convex pairs, it is possible to accurately determine whether the end portion of the connecting pipe taken out from the container is the first or second joint portion for the following reason. As a result, it is possible to avoid the occurrence of a situation in which the movable core and the valve body are erroneously assembled to the connecting pipe, so that the assembly quality and the assembly workability are improved. That is, in the present invention, the first concave-convex pair consisting of the first convex portion and the first concave portion arranged on the outward side in the axial direction thereof is on the first side end surface, and on the second concave portion and the outer side in the axial direction thereof. A second concavo-convex pair consisting of a second convex portion that is lined up is arranged on the second side end surface, and if the concave and convex portions are arranged in the axial direction on each side end surface in this way as a concavo-convex pair, the convex portion or the concave portion is formed. Not only is it easier to recognize that is a concave / convex part (for example, recognition by a camera image) than when is a single (that is, not a pair of unevenness), but also which of the recognized concave / convex part is on the outward side in the axial direction. It also facilitates identification of the arrangement pattern (for example, identification determination by a camera image) as to whether or not it is located in. Therefore, for example, with the slit on the front side and the pipe body set in a predetermined direction, the uneven pair of the side end faces existing on the specific direction side when viewed from the slit center line is either the first or second uneven pair. Based on the determination result of whether (in other words, which of the concave and convex portions arranged as the concave-convex pair is on the outside, that is, closer to the shaft end), the end portion of the pipe body is either the first or second joint portion. Can be easily and accurately determined.

Further, according to the second feature, the first and second convex portions each have a top surface parallel to the center line of the slit at the tip, and in each first concave-convex pair and the corresponding second concave-convex pair. Since the circumferential distance between the top surfaces of the first convex portion and the second convex portion is set to be smaller than the plate thickness of the pipe body, the side edge of the other connecting pipe is inserted through the slit in one connecting pipe. It is possible to more effectively suppress the occurrence of situations in which the connecting pipes are entangled with each other. Therefore, it is possible to more reliably avoid scratches and burrs remaining on the surface of the connecting pipe due to the entanglement between the connecting pipes.

Further, according to the third feature, in the middle of the first and second predetermined portions of the pipe body, the first side end surface is the first intermediate unevenness composed of the first intermediate convex portion and the first intermediate concave portion adjacent in the axial direction. While having at least one pair, the second side end face has at least one pair of second intermediate unevenness consisting of a second intermediate concave portion facing the first intermediate convex portion and a second intermediate convex portion facing the first intermediate concave portion. Therefore, by adjusting the installation position, number, and installation range of the first and second intermediate unevenness pairs, the state in which the connecting pipes are not easily entangled with each other can be adjusted according to the plate thickness, pipe length, diameter, slit width, etc. of the connecting pipes. It becomes easy to set appropriately, and the setting work becomes easy.

Further, according to the fourth feature, in the first and second predetermined portions, the pair of first unevenness pairs is in the axial direction between the axial outer end of the first concave portion and the corresponding outer end of the pipe body. The distance is set to be the same, and in the pair of second unevenness pairs, the axial distance between the axial outer end of the second convex portion and the corresponding outer end of the pipe body is set to be the same. In this case, since the outer end of each connecting pipe is easy to recognize (for example, recognition by a camera image), if the axial distance from the outer end of the connecting pipe is stored in advance in the image recognition means, the axis thereof. It becomes easier to recognize the concave portion or the convex portion in the directional distance, and it becomes easy to distinguish the concave portion or the convex portion. As a result, the above-mentioned arrangement pattern can be discriminated more easily and accurately, so that the accuracy of determining whether the end portion of the connecting pipe is the first or second coupling portion can be improved.

A vertical sectional view showing an example of an electromagnetic fuel injection valve provided with the first embodiment of the connecting pipe according to the present invention. (A) is an enlarged cross-sectional view of the 2A arrow-viewing portion of FIG. 1, (B) is an enlarged cross-sectional view of the 2B arrow-viewing portion of FIG. (A) is a rear view (3A arrow view of FIG. 2C) of the connecting pipe as seen from a direction orthogonal to the paper surface of FIG. 1 and opposite to FIG. 1, and the orientation of the connecting pipe is , The case where the movable core and the valve body can be assembled without misassembly is shown. Further, (B) is a diagram corresponding to FIG. 3 (A), and shows a case where the direction of the connecting pipe is upside down from that of FIG. 3 (A) (that is, when the above misassembly occurs). FIG. 3 (A) correspondence diagram showing the second embodiment of the connecting pipe

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the present specification, the "axial direction", "radial direction", and "circumferential direction" are based on the central axis X of the electromagnetic fuel injection valve I, and for example, the direction along the central axis X is the axis. It is a direction, the radial direction about the central axis X is the radial direction, and the circumferential direction about the central axis X is the circumferential direction. Further, in the present invention and the present specification, in the electromagnetic fuel injection valve I, the fuel injection side is referred to as the front, and the opposite side, that is, the fuel inlet cylinder side is referred to as the rear.

First, the first embodiment will be described with reference to FIGS. 1 to 3. The valve housing Ih of the electromagnetic fuel injection valve I for the internal combustion engine has a bottomed cylindrical valve seat member 3 and the inner circumference of the front end fitted to the rear end portion of the valve seat member 3 and is liquid-tightly coupled ( A magnetic cylinder 4 to be welded (for example), a non-magnetic cylinder 6 having a front end abutted against the rear end of the magnetic cylinder 4 and liquid-tightly bonded (for example, welded), and a rear portion of the non-magnetic cylinder 6. A cylindrical and magnetic fixed core 5 whose front end is fitted to the inner peripheral surface and liquid-tightly bonded (for example, welded) and connected (for example, press-fitted or welded) to the rear end of the fixed core 5. The fuel inlet cylinder 26 to be provided is sequentially connected from the front end to the rear end.

The fuel inlet cylinder 26 may be integrally formed with the fixed core 5 with the same material. Further, although the fixed core 5 is shown as a constituent material that constitutes a part of the valve housing Ih in the embodiment, the fixed core 5 may be retrofitted to a valve housing that is a separate component from the fixed core 5. good.

The valve seat member 3, the magnetic cylinder 4, and the non-magnetic cylinder 6 constitute a valve casing 2 that accommodates the valve assembly V described later. The valve housing Ih including the valve casing 2, the fixed core 5, and the fuel inlet cylinder 26 has an outer peripheral surface having the same diameter except for a part of the fuel inlet cylinder 26 and the valve seat member 3.

The valve seat member 3 has a valve hole 7 that opens in the front end wall thereof, a conical valve seat 8 that is connected to the inner end of the valve hole 7, and a cylindrical hole-shaped guide hole that is connected to the large diameter portion of the valve seat 8. It has a 9. A steel plate injector plate 10 having a plurality of fuel injection holes 11 communicating with the valve holes 7 is liquid-tightly joined (for example, welded) to the front end surface of the valve seat member 3.

The rear portion of the non-magnetic cylindrical body 6 is fitted and fixed to the fixed core 5, while the front portion extends forward from the fixed core 5, and the valve casing extending from the extending portion to the valve seat member 3. The valve assembly V as a valve member is housed in 2 so as to be slidable back and forth.

The valve assembly V has a substantially spherical valve body 14 capable of sliding the guide hole 9 so as to open and close the valve hole 7 in cooperation with the valve seat 8, and a front end thereof is coupled (for example, welded) to the valve body 14. It is composed of a connecting pipe C to be formed and a movable core 12 formed having a diameter larger than that of the connecting pipe C and bonded (for example, press-fitted or welded) to the rear portion of the connecting pipe C.

A plurality of flat surfaces 14f arranged in the circumferential direction are formed on the outer peripheral surface of the valve body 14. A plurality of oil passages that allow axial passage of fuel are defined around the valve body 14 between the flat surface 14f and the inner peripheral surface of the guide hole 9.

Further, the movable core 12 is composed of a cylindrical body made of a magnetic material which is shorter in the axial direction and thicker in the radial direction than the connecting pipe C. Moreover, the movable core 12 is slidably fitted and supported on the inner peripheral surfaces of the magnetic cylinder 4 and the non-magnetic cylinder 6, and is arranged so that the rear end surface 12r faces the front end surface 5f of the fixed core 5. (See FIG. 2A).

Further, the connecting pipe C has a main part or all of a metal pipe body 13 which is arranged concentrically with the valve housing Ih and extends linearly (specifically, vertically passes through the valve casing 2). .. The tube main body 13 has a single slit 13s parallel to the central axis (corresponding to the central axis X of the valve housing Ih) over the entire longitudinal direction, and is formed in a thin cylindrical shape. A first coupling portion 131 to which the movable core 12 can be coupled (press-fitted) is provided at one axial end portion, that is, the rear end portion of the pipe body 13, and a valve body 14 is provided at the other end portion, that is, the front end portion in the axial direction. A second joint portion 132 that can be bonded (welded) is provided.

The first coupling portion 131 of the present embodiment is composed of a cylindrical surface that can be press-fitted into the small diameter portion of the vertical hole 12h of the movable core 12, and the cylindrical surface has a tapered tapered portion on the fixed core 5 side thereof. The first coupling portion 131 (cylindrical surface) can be easily press-fitted into the vertical hole 12h of the movable core 12. On the other hand, the second coupling portion 132 is composed of a tapered end surface which is a joint surface with the spherical valve body 14, and the pipe body 13 and the valve body 14 are in a state where the tapered end surface is abutted against the outer peripheral surface of the valve body 14. 16 is welded between the outer peripheral surfaces of the above.

Further, the rear end of the pipe body 13 faces the vertical hole 12h of the movable core 12 and constitutes a spring seat 13a that receives the front end of the valve spring 22, which will be described later.

By the way, of the first and second side end faces S1 and S2 of the pipe body 13 facing each other with the slit 13s in the circumferential direction, the first side end face S1 is the first convex portion as is clear from FIGS. 2 and 3. The first concave-convex pair P1 composed of a1 and the first concave portion b1 arranged on the outer side in the axial direction thereof is the first predetermined portion 13e1 near the first joint portion 131 and the second joint portion 132 near the first joint portion 131 of the pipe body 13. 2 Each of the predetermined parts 13e2 has. On the other hand, the second side end surface S2 has a second concave-convex pair P2 composed of a second concave portion b2 and a second convex portion a arranged on the outer side in the axial direction thereof, and the above-mentioned first predetermined portion 13e1 and second predetermined portion. It has each in 13e2.

Then, in the first and second predetermined portions 13e1 and 13e2 of the pipe body 13, the first concave portion b1 and the first convex portion a1 of the first concave-convex pair P1 and P1 are the second convex portions of the second concave-convex pair P2 and P2. It is arranged so as to face each of a2 and the second recess b2.

Moreover, in the present embodiment, as is clear from FIGS. 2A and 2B, the first and second convex portions a1 and a2 have top surfaces a1f and a2f parallel to the center line 13sx of the slit 13s at their tips, respectively. Have. Then, in each of the first concavo-convex pair P1 and the second concavo-convex pair P2 corresponding to the first concavo-convex pair P1, the circumferential distance w between the top surfaces a1f and a2f of the first convex portion a1 and the two convex portions a2. Is set smaller than the plate thickness t of the pipe body 13.

Further, as is clear from FIGS. 2A and 2B, in the first and second predetermined portions 13e1 and 13e2 of the pipe body 13, the pair of first unevenness pairs P1 is outward in the axial direction of the first convex portion a1. The axial distance d between the axial outer end of the first recess b1 adjacent to the side and the outer end of the corresponding pipe body 13 is set to be the same. Similarly, the pair of second unevenness pairs P2 is between the axial outer end of the second convex portion a2 adjacent to the axial outer side of the second concave portion b2 and the outer end of the corresponding pipe body 13. Axial distance d'is set to be the same.

By the way, the valve assembly V includes a vertical hole 12h of the movable core 12, an internal space of a pipe body 13 that directly communicates with the vertical hole 12h, and an internal oil passage 18 including the slit 13s. The internal oil passage 18 communicates with the annular oil passage 19 defined between the valve casing 2 and the facing peripheral surface of the pipe body 13.

Further, the fixed core 5 has a vertical hole 21 that allows the hollow portion of the fuel inlet cylinder 26 to communicate with the front end surface 5f side of the fixed core 5. The vertical hole 21 has a smaller diameter than the hollow portion of the fuel inlet cylinder 26, and communicates with the vertical hole 12h of the movable core 12 (hence, the internal oil passage 18 of the valve assembly V).

A pipe-shaped retainer 23 with a slit is press-fitted into the vertical hole 21 of the fixed core 5, and the movable core 12 is urged to the valve closing side of the valve body 14 between the retainer 23 and the spring seat 13a. The valve spring 22 is reduced. At that time, the set load of the valve spring 22 is adjusted by the fitting depth of the retainer 23 into the vertical hole 21.

Further, the movable core 12 has an annular step portion 12b recessed near the inner peripheral end of the rear end surface 12r thereof, and a short cylindrical stopper made of a non-magnetic material is provided on the inner peripheral surface of the annular step portion 12b. The member 37 is fixed (eg, press-fitted or welded). The rear end surface of the stopper member 37 functions as a stopper surface 37a that can come into contact with the front end surface 5f of the fixed core 5, and the stopper surface 37a slightly protrudes from the rear end surface 12r of the movable core 12.

The stopper member 37 described above brings the stopper surface 37a into contact with the front end surface 5f of the fixed core 5 during magnetic attraction between the fixed and movable cores 5 and 12, so that the stopper surface 37 is between the opposite end surfaces of the fixed core 5 and the movable core 12. Leave a given gap. Thus, the front end surface 5f of the fixed core 5 constitutes a suction surface capable of magnetically attracting the movable core 12.

Further, a cylindrical coil assembly 28 corresponding to the fixed core 5 and the movable core 12 is fitted on the outer periphery of the valve housing Ih. The coil assembly 28 includes a bobbin 29 that fits on the outer peripheral surface of the fixed core 5 from the rear end portion of the magnetic cylinder 4, and a coil 30 that is wound around the bobbin 29. The bobbin 29 and the coil 30 have a cylindrical shape, and their central axes coincide with the central axis X of the fuel injection valve I.

The bobbin 29 integrally has a terminal support portion 29a projecting to one side of the bobbin 29 at the rear end portion thereof, and the base end portion 33a of the coupler terminal 33 is held by the terminal support portion 29a. .. The terminal of the coil 30 is connected to the coupler terminal 33 via a wiring that passes through the terminal support portion 29a.

The coil assembly 28 is surrounded by a coil housing H made of a magnetic material. In the present embodiment, the coil housing H is formed in a substantially semi-cylindrical shape (in other words, a cross-sectional inferior arc shape), and the first and second coil housing halves are arranged so as to sandwich the coil assembly 28. It is divided into H1 and H2. In FIG. 1, only the first coil housing half body H1 is shown and the second coil housing half body H2 is omitted due to the cross-sectional position.

The first and second coil housing halves H1 and H2 have a cylindrical body portion 44 that covers the outer peripheral portion of the coil assembly 28, and the bobbin 29 is bent inward from both ends in the axial direction of the body portion 44. Front / rear connecting cylinders 47 as connecting parts that extend in the opposite directions in the axial direction from the inner peripheral ends of the front / rear connecting wall portions 45, 46 that abut on the front and rear end surfaces. , 48 and respectively. The front and rear connecting cylinders 47 and 48 are closely fixed (for example, welded) to the outer peripheral surfaces of the valve casing 2 (more specifically, the magnetic cylinder 4) and the fixed core 5, respectively. Further, the peripheral edges of the first and second coil housing halves H1 and H2 that are adjacent to each other in the circumferential direction are opposed to each other at a distance from each other in the circumferential direction.

Thus, as will be described later, the coil housing H forms a magnetic circuit between the valve casing 2 and the fixed core 5 when the coil 30 is energized, and the movable core 12 (hence, the valve assembly V) is attached to the fixed core 5. It can be magnetically attracted against the valve spring 22 so that the valve body 14 of the valve assembly V can open the valve. In the present embodiment, the first and second coil housing halves H1 and H2 are shown as separate bodies, but both may be integrally configured.

Further, the fuel injection valve I is composed of a resin coating portion 32 whose outer shell is molded with an insulating synthetic resin. The resin coating portion 32 includes a covering portion main body 32m having a stepped cylindrical shape concentric with the valve housing Ih, and a coupler main body portion 32c protruding unilaterally from the outer peripheral portion of the covering portion main body 32m.

The coupler main body 32c accommodates and holds the above-mentioned coupler terminal 33 therein. Then, the coupler 34 is configured by the coupler main body 32c and the coupler terminal 33. Although not shown, an external coupler connected to the external wiring is detachably fitted and connected to the coupler 34.

Thus, the covering body 32m includes a part of the valve casing 2 (that is, the latter half of the magnetic cylinder 4 and the non-magnetic cylinder 6), the fixed core 5, the majority of the fuel inlet cylinder 26, and the coil. The assembly 28 and the coil housing H are sealed and molded together with the coupler main body 32c.

Next, the operation of the embodiment will be described.

In assembling the fuel injection valve I, for example, the valve assembly V, the coil assembly 28, and the main parts of the valve housing Ih except for the valve seat member 3 are manufactured separately. Next, the coil assembly 28 is fitted in the outer peripheral middle portion of the valve housing Ih, and then the first and second coil housing halves H1 and H2 are wrapped in the body portion 44 so that the coil assembly 28 is wrapped in the valve housing. It is fixed to the outer circumference of Ih. After that, the resin coating portion 32 is molded around the valve housing Ih. At that time, the molten resin is filled in the radial gap 27 between the coil housing halves H1 and H2 and the coil assembly 28 through the circumferential gap between the first and second coil housing halves H1 and H2.

After molding the resin coating portion 32, the valve assembly V is fitted into the magnetic cylinder 4 from the front, and then the valve seat member 3 is welded to the front end portion of the magnetic cylinder 4. Then, the valve spring 22 and the retainer 23 are mounted in the valve housing Ih from the fuel inlet cylinder 26 side, and then the fuel filter 43, the seal ring 51 and the cushion ring 53 are mounted to complete the assembly of the fuel injection valve I.

In the fuel injection valve I after assembly, the outer peripheral portion of the covering portion main body 32 m is fitted into a stepped valve support hole provided in, for example, the engine main body of an internal combustion engine or its accessories (for example, a throttle body, an intake pipe, etc.). Will be done. At that time, the fitting portion between the outer circumference of the covering portion main body 32m and the valve support hole is sealed via the seal ring 51 fitted to the forward step portion of the outer peripheral portion of the front end portion of the covering portion main body 32m. Further, a fuel distribution pipe connected to a fuel pump (not shown) is attached to the rear end opening of the fuel inlet cylinder 26 via a fuel filter 43 to prevent the fuel injection valve I from coming off from the valve support hole. To. At that time, the fitting portion between the fuel distribution pipe and the fuel inlet cylinder 26 is sealed via a seal ring 53 fitted to the outer periphery of the rear portion of the fuel inlet cylinder 26. Thus, the fuel injection valve I is set in the engine body of the internal combustion engine or its accessories.

In such a set state of the fuel injection valve I, the fuel pumped from the fuel pump to the fuel inlet cylinder 26 via the fuel distribution pipe fills the inside of the fixed core 5 and the valve casing 2 via the fuel filter 43. Then, in the state where the coil 30 is degaussed, the valve assembly V is pressed forward by the urging force of the valve spring 22, and the valve body 14 is seated on the valve seat 8 to close the valve hole 7 (see FIG. 1).

Further, when the coil 30 is excited by energization from the valve closed state, the magnetic flux runs through the coil housing H, the magnetic cylinder 4, the movable core 12, and the fixed core 5 in order, and magnetic attraction generated between the cores 5 and 12. The movable core 12 is sucked into the fixed core 5 against the valve closing force of the valve spring 22 by the force, and the valve body 14 is separated from the valve seat 8, so that the valve hole 7 is opened. As a result, the high-pressure fuel in the valve casing 2 exits the valve hole 7 and is injected in the form of mist from the fuel injection hole 11 of the injector plate 10.

By the way, in the valve assembly V, after the connecting pipe C, the valve body 14 and the movable core 12 are manufactured separately, the valve body 14 and the movable core 12 are connected to one end and the other end of the connecting pipe C, respectively. In particular, an example of the manufacturing process of the connecting pipe C will be described below.

That is, on one side edge of a rectangular flat plate made of a metal plate, first concave-convex pairs P1 and P1 made of first convex portions a1 and first concave portions b1 adjacent to each other in the axial direction at predetermined portions near both ends thereof. A second concavo-convex pair P2, P2 composed of a second convex portion a2 and a second concave portion b2 adjacent to each other in the axial direction at a predetermined portion near both ends of the rectangular flat plate, which is machined respectively. Are machined respectively. After that, the rectangular flat plate is formed by rolling the one-side end edge and the other-side end edge into a pipe shape so as to face each other with the slit 13s interposed therebetween, and after the forming, one end portion and the other end portion in the axial direction of the pipe are formed. In addition, the press-fitted surface to be the first joint portion 131 and the tapered end face to be the second joint portion 132 are machined.

A large number of connecting pipes C manufactured in this way are placed in a single container together with an abrasive or the like and subjected to rotation or vibration to finish the surface of the connecting pipe C (for example, barrel polishing). At that time, there is a concern that the surface of the connecting pipe C may be damaged due to the side edge of the other connecting pipe C entering the one connecting pipe C through the slit 13s thereof and the connecting pipes C being entangled with each other. Further, when assembling the movable core 12 and the valve body 14 to the connecting pipe C after the finishing process, it is misidentified whether the end portion of the connecting pipe C is the first or second connecting portion 131 or 132, and the movable core 12 and the valve body 14 are movable. There is also a concern that the core 12 and the valve body 14 may be misassembled.

Therefore, the connecting pipe C of the present embodiment has the following technical features so that the above problem does not occur. That is, of the first and second side end faces S1 and S2 of the pipe body 13 facing each other with the slit 13s in the circumferential direction, the first side end face S1 is the first convex portion a1 and its axial outer side. A first concave-convex pair P1 composed of a first concave portion b1 arranged side by side is provided at a first predetermined portion 13e1 near the first joint portion 131 and a second predetermined portion 13e2 near the second joint portion 132 of the pipe body 13, respectively. In addition, the second side end surface S2 has a second concavo-convex pair P2 composed of a second concave portion b2 and a second convex portion a arranged on the outer side in the axial direction thereof, with the above-mentioned first predetermined portion 13e1. It has each in the second predetermined portion 13e2. Moreover, the first concave portion b1 and the first convex portion a1 of the first concave-convex pair P1 and P1 are arranged so as to face the second concave portion b2 and the second convex portion a2 of the corresponding second concave-convex pair P2 and P2. Will be done.

By providing the first concavo-convex pair P1 and P1 at the predetermined portion of the first side end surface S1 and the second concavo-convex pair P2 and P2 at the predetermined portion of the second side end surface S2 in this way, a large number of connecting pipes C Even when finishing (for example, barrel polishing, etc.) is performed by collectively accommodating the above in a container, the side end edges of the other connecting pipes C can be inserted into one connecting pipe C through the slit 13s. It can be prevented by the first and second convex portions a1 and a2 of the pairs P1 and P2, and it is possible to suppress the occurrence of a situation in which the connecting pipes C are entangled with each other.

Further, according to the special provision of the first and second concavo-convex pairs P1, P1; P2 and P2 described above, which of the first and second joint portions 131 and 132 is the end portion of the connecting pipe C taken out from the container. The discrimination can be accurately performed for the reason described below, and the occurrence of a situation in which the movable core 12 and the valve body 14 are erroneously assembled to the connecting pipe C can be avoided, so that the assembly quality and the assembly workability are improved. That is, in the present invention, the first concave-convex pair P1 and P1 composed of the first convex portion a1 and the first concave portion b1 arranged on the outer side in the axial direction thereof are on the first side end surface S1 and the second concave portion b2 and this. A second concavo-convex pair P2 composed of a second convex portion a arranged on the outer side in the axial direction is arranged on the second side end surface S2, respectively. If a1 (a2) and the concave portion b1 (b2) are arranged as a concave-convex pair in the axial direction, it is recognized that the convex portion or the concave portion is a concave portion / convex portion rather than a single (that is, not a concave-convex pair) (for example, a camera image). Not only is it easy to recognize by), but it is also easy to identify the arrangement pattern (for example, identification determination by a camera image) which of the recognized concave and convex portions is located on the outer side in the axial direction.

As a result, when the pipe body 13 is set in a predetermined direction with the slit 13s on the front side, for example, the slit center line 13sx is set on the jig in a posture extending in the vertical direction as shown in FIG. The concavo-convex pair of the side end faces (first side end face S1 in FIG. 3A and second side end face S2 in FIG. 3B) existing on the specific direction side (left side in FIG. 3) are the first and first. Based on the determination result of which of the two concavo-convex pairs P1 and P2 (in other words, which of the concave and convex portions arranged as the concavo-convex pair is on the outside, that is, closer to the shaft end), the end portion of the pipe body 13 is It is possible to easily and accurately determine which of the first and second coupling portions 131 and 132 is.

More specifically, when the orientation of the pipe body 13 in the set state is, for example, the orientation in which the movable core 12 and the valve body 14 can be correctly assembled as illustrated in FIG. 3A. , The arrangement pattern of the concave portion b1, the convex portion a1, the convex portion a1, and the concave portion b1 from one end in the axial direction on the side end surface (first side end surface S1) existing on the specific direction side (left side in FIG. 3) when viewed from the slit center line 13sx. That is, it is recognized that it is the first unevenness pair P1). Therefore, if such recognition is obtained, for example, based on a camera image, it can be seen that the set state of the tube body 13 is in the correct direction, and the upper end portion and the lower end portion of the tube body 13 at that time are first coupled, respectively. It is possible to determine that the unit 131 and the second coupling unit 132.

On the other hand, when the orientation of the pipe body 13 in the set state is, for example, the orientation in which the movable core 12 and the valve body 14 are erroneously assembled as illustrated in FIG. 3 (B), the slit Arrangement pattern of convex portion a2, concave portion b2, concave portion b2, and convex portion a2 from one end in the axial direction on the side end surface (second side end surface S2) existing on the specific direction side (left side in FIG. 3) when viewed from the center line 13sx. It is recognized that it is a two-concavo-convex pair P2). Therefore, if such recognition is obtained, for example, based on a camera image, it can be seen that the set state of the tube body 13 is in the wrong direction.

Further, in the connecting pipe C of the embodiment, in the present embodiment, the first and second convex portions a1 and a2 have top surfaces a1f and a2f parallel to the center line 13sx of the slit 13s at their tips, respectively. In the first concavo-convex pair P1 and the second concavo-convex pair P2 corresponding to the first concavo-convex pair P1, the circumferential distance w between the top surfaces a1f and a2f of the first convex portion a1 and the second convex portion a2 is the tube main body. It is set smaller than the plate thickness t of 13. As a result, it is possible to more effectively suppress the occurrence of a situation in which the side end edges of the other connecting pipes C enter into one connecting pipe C through the slit 13s and the connecting pipes C are entangled with each other. It is possible to more reliably avoid scratches and burrs remaining on the surface of the connecting pipe C due to the entanglement of the connecting pipe C.

Moreover, the concave portions b1 and the convex portions a1 of the first unevenness pair P1 are arranged adjacent to each other in the axial direction on the first side end surface S1 near the end of the pipe body 13, and the second unevenness pair P2 is arranged on the second side end surface S2. By arranging the concave portions b2 and the convex portions a2 adjacent to each other in the axial direction, not only the heights of the individual convex portions a1 and a2 can be made relatively low, but also the depths of the individual concave portions b1 and b2 are made relatively shallow. Therefore, it is possible to suppress the decrease in strength of the peripheral portion of the slit 13s of the pipe body 13 due to the formation of the recesses b1 and b2 as much as possible.

Further, as is clear from FIG. 2, in the first and second predetermined portions 13e1 and 13e2 of the pipe body 13, the pair of first unevenness pairs P1 is the axial outer end of the first concave portion b1 and the corresponding pipe. The axial distance d between the outer end of the main body 13 is set to be the same, and the pair of second uneven pair P2 is the outer end of the second convex portion a2 in the axial direction and the outer end of the corresponding pipe main body 13. The axial distance d'between the ends is set to be the same. In this case, since the outer end of each connecting tube C is easy to recognize (for example, recognition by a camera image), the connecting tube C can be used as an image recognition means (for example, an inspection device capable of image recognition processing, a computer, etc.). If the axial distance d (d') from the outer end of the is stored in advance, it is easier to recognize the first concave portion b1 (second convex portion a2) existing in the axial distance d (d'). Therefore, it becomes easy to distinguish the concave portion or the convex portion. As a result, the above-mentioned arrangement pattern can be discriminated more easily and accurately, so that the accuracy of determining which of the first and second coupling portions 131 and 132 the end portion of the connecting pipe C is can be improved. can.

Next, a second embodiment of the present invention will be described with reference to FIG. In the connecting pipe C of the second embodiment, as in the first embodiment, the first side end surface S1 of the pipe body 13 is composed of the first convex portion a1 and the first concave portion b1 arranged on the outward side in the axial direction thereof. First concavo-convex pair P1 Each of the first and second predetermined portions 13e1 and 13e2 has a second unevenness pair P2 composed of b2 and a second convex portion a arranged on the outer side in the axial direction thereof.

Moreover, in the second embodiment, the first side end surface S1 of the pipe body 13 exists in the middle of the first and second predetermined portions 13e1, 13e2 (in other words, in the first and second predetermined portions 13e1, 13e2, respectively). In the middle of the first unevenness pair P1 and P1, at least one set of the first intermediate unevenness pair P1'consisting of the first intermediate convex portion am1 and the first intermediate concave portion bm1 adjacent to each other in the axial direction is provided. Further, the second side end surface S2 of the pipe body 13 is an intermediate of the first and second predetermined portions 13e1 and 13e2 (in other words, the second uneven pair P2 and P2 existing in the first and second predetermined portions 13e1 and 13e2, respectively. In the middle), there is at least one pair of second intermediate unevenness pairs P2'composed of a second intermediate concave portion mb2 facing the first intermediate convex portion am1 and a second intermediate convex portion am2 facing the first intermediate concave portion mb1.

Then, according to this second embodiment, the connecting pipe C is adjusted by adjusting the installation positions, numbers, and installation ranges of the first and second intermediate recesses bm1 and bm2 and the first and second intermediate convex portions am1 and am2. It becomes easy to appropriately set a state in which mutual entanglement is difficult to occur according to the plate thickness t, pipe length, diameter, slit width, etc. of the connecting pipe C, and the setting work becomes easy.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto, and various design changes can be made without departing from the gist thereof.

For example, the structures of the first and second coupling portions 131 and 132 provided at one end and the other end of the connecting pipe C are not limited to the first and second embodiments, that is, the first and second coupling portions are not limited to the first and second embodiments. It can be appropriately selected according to the shape and the coupling means of the movable core 12 and the valve body 14 to be coupled to the coupling portions 131 and 132, respectively.

Further, in the first and second embodiments, the first and second convex portions a1 and a2 provided on the connecting pipe C each have top surfaces a1f and a2f parallel to the center line 13sx of the slit 13s at their tips. As shown, the tips of at least some of the convex portions a1 and a2 do not necessarily have their apex surfaces a1f and a2f parallel to the center line 13sx. It may be an arcuate curved surface.

Further, in the first and second embodiments, the pair of first uneven pair P1 provided on the first side end surface S1 in the first and second predetermined portions 13e1 and 13e2 of the pipe body 13 is in the axial direction of the first recess b1. The axial distance d between the outer end and the outer end of the corresponding pipe body 13 is set to be the same, and the pair of second uneven pair P2 provided on the second side end surface S2 is a second convex portion. Although the axial distance d'between the axial outer end of a2 and the corresponding outer end of the pipe body 13 is set to be the same, the axial distance d (or d') is shown. , The setting may be different between the one end side and the other end side of the pipe body 13.

C ・ ・ ・ ・ ・ ・ Connecting pipe I ・ ・ ・ ・ ・ ・ Electromagnetic fuel injection valve Ih ・ ・ ・ ・ ・ Valve housings P1, P2 ・ ・ 1st and 2nd uneven pair P1 ′, P2 ′ ・ ・ 1st , 2nd intermediate uneven pair S1, S2 ..... 1st and 2nd side end faces X of the pipe body ..... Central axis lines a1, a2 ..... 1st and 2nd convex portions a1f, a2f ... 1, Top surface of the second convex portion am1, am2 ... First, second intermediate convex portion b1, b2 .... First, second concave portion bm1, bm2 ... First, second intermediate concave portion d, d ′ ・ ・ ・ Axial distance w ・ ・ ・ ・ Circumferential distance 5 ・ ・ ・ ・ ・ ・ Fixed core 7 ・ ・ ・ ・ ・ Valve hole 12 ・ ・ ・ ・ ・ Movable core 13 ・ ・ ・ ・ ・ Tube Main body 13e1, 13e2 ... First, second predetermined part 13s ... Slit 13sx ... Slit center line 14 ... Valve body 30 ... Coil 131, 132 ... First 1, Second joint

Claims (4)

The fixed core (5) fixed to the valve housing (Ih), the coil (30) surrounding the fixed core (5), and the coil (30) slidably housed in the valve housing (Ih). A movable core (12) that is sucked into the fixed core (5) when energized to the valve housing (Ih), and a valve body (14) that can open and close the valve hole (7) provided at the front end of the valve housing (Ih). A connecting pipe (C) used for coupling between the movable core (12) and the valve body (14) in the electromagnetic fuel injection valve (I).
The valve housing (Ih) includes a pipe body (13) concentrically arranged with the valve housing (Ih) and extends linearly, and the pipe body (13) is parallel to the central axis (X) thereof. A first coupling portion (12) to which the movable core (12) can be bonded to one axial end portion of the pipe body (13), which has a single slit (13s) over the entire length direction and is formed in a cylindrical shape. 131), and a second coupling portion (132) to which the valve body (14) can be coupled is provided at the other end in the axial direction.
Of the first and second side end faces (S1, S2) of the tube body (13) facing each other with the slit (13s) in the circumferential direction, the first side end face (S1) is the first convex portion (S1). The first concave-convex pair (P1) composed of a1) and the first concave portion (b1) arranged on the outer side in the axial direction thereof is the first predetermined pair (P1) closer to the first joint portion (131) of the pipe body (13). The second predetermined portion (13e2) near the second joint portion (132) has the portion (13e1), while the second side end surface (S2) has the second recess (b2) and the outside of the axial direction thereof. The first predetermined portion (13e1) and the second predetermined portion (13e2) each have a second concave-convex pair (P2) composed of a second convex portion (a) arranged on the side.
The first concave portion (b1) and the first convex portion (a1) of each of the first concave-convex pair (P1) are the second convex of the second concave-convex pair (P2) corresponding to the first concave-convex pair (P1). A connecting pipe for an electromagnetic fuel injection valve, characterized in that it is arranged so as to face each of a portion (a2) and a second recess (b2). The first and second convex portions (a1, a2) each have a top surface (a1f, a2f) parallel to the center line (13sx) of the slit (13s) at the tip thereof.
In each of the first concavo-convex pairs (P1) and the second concavo-convex pair (P2) corresponding to the first concavo-convex pair (P1), the first convex portion (a1) and the two convex portions (a2). The electromagnetic type according to claim 1, wherein the circumferential distance (w) between the top surfaces (a1f, a2f) is set to be smaller than the plate thickness (t) of the pipe body (13). Connecting pipe for fuel injection valve. In the middle of the first and second predetermined portions (13e1, 13e2) of the pipe body (13), the first side end surface (S1) has a first intermediate convex portion (am1) and a first intermediate convex portion (am1) adjacent to each other in the axial direction. While having at least one pair of first intermediate unevenness pairs (P1') composed of one intermediate concave portion (bm1), the second side end surface (S2) is a second intermediate concave portion facing the first intermediate convex portion (am1). The first aspect of the present invention is characterized in that it has at least one pair of second intermediate unevenness pairs (P2') composed of (bm2) and a second intermediate convex portion (am2) facing the first intermediate concave portion (bm1). Connecting pipe for electromagnetic fuel injection valve. In the first and second predetermined portions (13e1, 13e2), the pair of first unevenness pairs (P1) is the axial outer end of the first concave portion (b1) and the corresponding pipe body (13). The axial distance (d) between the outer end and the outer end of the second convex portion (a2) is set to be the same, and the pair of the second concave-convex pair (P2) is the axial outer end of the second convex portion (a2). The connecting pipe for an electromagnetic fuel injection valve according to claim 1, wherein the axial distance (d') between the pipe body (13) and the outer end of the pipe main body (13) is set to be the same. ..

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