JP2011044293A - Check valve for fuel injection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve for fuel injection, in which a pressure drop of a high pressure liquid fuel is suppressed by making a built-in cylindrical filter larger in size than before, and fuel supply time can be shortened. <P>SOLUTION: In the check valve 10, a valve stem 11 is formed by joining a first and second stems 20, 30. Then, a filter 54 is fitted only to the first axial center hole 24 of the first stem 20. By this, a diameter of the filter 54 can be made larger regardless of a valve seat member 53, the pressure drop of the high pressure liquid fuel is suppressed, and the fuel supply time can be shortened. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuel injection check valve that is fixed to a fuel injection port of a fuel tank for a fuel cell and that incorporates a filter.

  Conventionally, as this type of fuel injection check valve, one that is fixed to a fuel injection port of a vehicle equipped with a fuel cell corresponding to a fuel supply port of a gasoline vehicle is known. As an example, the conventional fuel injection check valve shown in FIG. 5 includes a valve body 4, a valve body biasing spring 5, a valve body inside a valve stem 3 formed by connecting the first and second stems 1 and 2. The seat member 6 and the filter 7 are accommodated and provided. In order to accommodate these valve bodies 4 and the like, a first axial hole 1 </ b> A whose diameter is increased stepwise toward the second stem 2 is formed in the axial center portion of the first stem 1. Then, the filter 7 is fitted (freely fitted) into the first axial hole 1A, and a fixing flange 7F protruding laterally from the base end portion of the filter 7 is fitted into the first axial hole 1A. The valve seat member 6 is fitted in the first axial hole 1A so as to overlap the fixed flange 7F. On the other hand, the valve body urging spring 5 and the valve body 4 are inserted and assembled in order into the second axial hole 2A. And the 1st and 2nd stems 1 and 2 are screwed together (for example, refer to patent documents 1).

JP 2008-232361 A (see paragraph [0002], FIG. 1)

  However, the conventional fuel injection check valve described above has a large pressure loss in the filter 7, so that the high-pressure fluid fuel does not flow smoothly, requires time for fuel supply, and increases the strength of the filter 7 against the fluid resistance. It was necessary to make it high. In order to solve this problem, an increase in the size of the filter 7 has been demanded. However, in the conventional check valve for fuel injection, the valve seat member 6 is fitted to the first axial hole 1A after the filter 7. Since it is configured, it is necessary to make the outer diameter of the filter 7 equal to or smaller than the outer diameter of the valve seat member 6, and the filter 7 cannot be enlarged.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a check valve for fuel injection that can reduce the pressure loss of high-pressure fluid fuel by reducing the pressure loss of the high-pressure fluid fuel by increasing the size of the built-in filter. .

  A fuel injection check valve (10, 10V) according to the invention of claim 1 made to achieve the above object is a valve stem fixed to a fuel inlet (96A) of a fuel tank (96) for a fuel cell. (11) is a second stem having a second axial hole (35) in the axial center at one end of the first stem (20, 20V) having a first axial hole (24) in the axial center. The high pressure fluid fuel can be supplied from the first axial hole (24) to the fuel tank (96) through the second axial hole (35), and the first axial hole. A valve seat member having a through-hole (53C) in the shaft center portion by preventing foreign matter from entering the fuel tank (96) by a filter (54) fitted to the second stem (30, 30V) side in (24) (53) is fitted to the second axial hole (35) from the first stem (20, 20V) side. A chamber (50B) is formed in the middle of the second axial hole (35), and the valve body (51) capable of opening and closing the valve port (53A) in the chamber (50B) and the valve body (51) are closed. In the fuel injection check valve (10, 10V) provided with a valve body urging spring (50) for urging the valve side to prevent back flow of the high-pressure fluid fuel, the valve seat member (53) is provided with the first and first Of the two axial holes (24, 35), only the second axial hole (35) is fitted.

  In the fuel injection check valve (10W) according to the second aspect of the invention, the valve stem (11) fixed to the fuel injection port (96A) of the fuel tank (96) for the fuel cell has a first shaft center. A high-pressure fluid fuel is formed by connecting a second stem (30W) having a second axial hole (35) to the axial center of one end of the first stem (20V) having an axial hole (24). The fuel can be supplied from the first axial hole (24) to the fuel tank (96) through the second axial hole (35), and fitted into the first axial hole (24) from the second stem (30, 30V) side. The combined filter (54) prevents foreign matter from entering the fuel tank (96), and a plug member (70) having a through hole (70B) in the shaft center portion is provided in the second shaft hole (35). A chamber (72) is formed in the middle of the second axial hole (35) by fitting from the opposite side of the stem (20V) The valve body (51) capable of opening and closing the valve port (53A) in the chamber (72) and the valve body biasing spring (50) for biasing the valve body (51) toward the valve closing side are provided with a high pressure. It is characterized by preventing backflow of fluid fuel.

  According to a third aspect of the present invention, in the fuel injection check valve according to the first aspect, the second stem (30) is provided with a fixing portion (34A) for fixing the fuel injection port (96A). However, it has characteristics.

[Invention of Claim 1]
In the fuel injection check valve (10, 10V) according to the first aspect, since the valve seat member (53) is fitted only in the second axial hole (35), it is independent of the valve seat member (53). The diameter of the filter (54) can be made larger than before, and the pressure loss of the high-pressure fluid fuel can be suppressed, and the fuel supply time can be shortened.

[Invention of claim 2]
In the fuel injection check valve (10W) according to claim 2, the plug member (70) for forming the chamber (72) is fitted into the second axial hole (35) from the side opposite to the first stem (20V). Therefore, the diameter of the filter (54) can be made larger than before, irrespective of the plug member (70), the pressure loss of the high-pressure fluid fuel can be suppressed, and the fuel supply time can be shortened.

[Invention of claim 3]
According to the third aspect of the present invention, the first stem (20) is detached from the second stem (30) while the second stem (30) is fixed to the fuel inlet (96A), and the filter (54). The valve seat member (53), the valve body (51), and the valve body biasing spring (50) can be maintained.

1 is a side sectional view showing a state in which a fuel injection check valve according to a first embodiment of the present invention is connected to a fuel supply plug. Cross section of fuel injection check valve Side sectional view of the fuel injection check valve of the second embodiment Side sectional view of the fuel injection check valve of the third embodiment Cross-sectional side view of a conventional fuel injection check valve

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a fuel injection chamber 98 of a vehicle 99 equipped with a fuel cell. The fuel injection chamber 98 is formed to be depressed on the outer surface of the vehicle 99, and the opening is opened and closed by an opening / closing lid 97. A valve mounting hole 91 is formed through the back wall 90 of the fuel injection chamber 98, and the fuel injection check valve 10 (hereinafter simply referred to as “check valve 10”) of this embodiment is inserted therethrough. A fuel tank 96 for a fuel cell is mounted on the vehicle 99 at a position away from the inside of the fuel injection chamber 98, and an extension pipe 95 extends from the fuel tank 96 to the vicinity of the back side of the fuel injection chamber 98. Further, the distal end portion of the extension pipe 95 is a fuel inlet 96A of the fuel tank 96 according to the present invention, and the valve stem 11 of the check valve 10 is fixed to the fuel inlet 96A. A fuel supply plug 80 provided in a fuel supply station corresponding to a gasoline station is connected to the check valve 10, and high-pressure fluid fuel (for example, liquid hydrogen) discharged from the fuel supply plug 80 passes through the check valve 10 to fuel. It is injected into the tank 96.

  The check valve 10 includes a filter 54, a valve body 51, a valve body biasing spring 50, and the like inside the valve stem 11. The valve stem 11 is formed by coupling first and second stems 20 and 30 as shown in FIG. The first stem 20 has a cylindrical shape in which a first axial hole 24 is formed through the axial center. On the outer surface of the first stem 20, a plug locking groove 21 is formed at a position near the distal end, and a male screw part 26 is formed at a position near the base end, and further, on the base end side from the male screw part 26, A flange pressing portion 27 having an outer diameter slightly smaller than that of the male screw portion 26 is provided. The plug locking groove 21 side of the first stem 20 with respect to the male screw portion 26 is a receptacle projection 23 that is detachably connected to the fuel supply plug 80.

  The first shaft hole 24 is a filter fitting portion 24D having a relatively large inner diameter in a range from the end on the flange pressing portion 27 side to the position closer to the plug locking groove 21. The filter fitting portion 24D The filter 54 is fitted (in detail, loosely fitted). The filter 54 has a cylindrical shape with a distal end closed by a distal end wall 54D, and the inside of the proximal end is reduced in a stepped shape. In addition, a plurality of fluid passage holes 54 </ b> C are perforated on the cylindrical wall 54 </ b> A of the filter 54 over substantially the whole. Further, a circular fixing flange 54 </ b> B protrudes laterally from the outer surface of the base end portion of the filter 54. The filter 54 is fitted to the filter fitting portion 24 </ b> D from the front end side, and the fixed flange 54 </ b> B is abutted against the end surface of the flange pressing portion 27. Accordingly, the end opening in the cylindrical gap 54E between the filter 54 and the inner surface of the first axial hole 24 (filter fitting portion 24D) is closed by the fixing flange 54B, and the first stem 20 The high-pressure fluid fuel flowing to the two stems 30 always passes through the fluid passage hole 54C of the filter 54, and foreign matters larger than the fluid passage hole 54C are blocked by the filter 54.

  A tip end side of the first shaft hole 24 from the filter fitting portion 24D is a nozzle entry portion 24C having a relatively small inner diameter. In addition, a nozzle introduction portion 24A having a diameter larger than that of the nozzle entry portion 24C is provided at an end portion of the nozzle entry portion 24C opposite to the filter fitting portion 24D, and the nozzle introduction portion 24A and the nozzle entry portion 24C are provided. An O-ring groove 24B is formed at the boundary portion, and an O-ring 25 is accommodated therein. Then, the nozzle 84 described below is inserted up to an intermediate position of the nozzle entry portion 24C (see FIG. 1).

  The fuel supply plug 80 coupled to the receptacle protrusion 23 of the first stem 20 has the following configuration. That is, as shown in FIG. 1, the fuel supply plug 80 includes a plug sleeve 82, a linear motion sleeve 81 that is fitted to the outside of the plug sleeve 82 and linearly moves, and a nozzle 84 that is fixed to the inside of the plug sleeve 82. Yes. In the linear motion sleeve 81, a plurality of ball holes 82A are formed through the portions corresponding to the plug locking grooves 21 of the receptacle projection 23, and the linear motion is performed with the engagement balls 83 being received in the respective ball holes 82A. A sleeve 81 covers the engaging ball 83 from the outside.

  Further, a ball receiving groove 81A is formed on the inner side of the front end of the linear movement sleeve 81, and the linear movement sleeve 81 is at an origin position where the ball receiving groove 81A is shifted from the engagement ball 83 toward the front end side of the plug sleeve 82. Energized to be placed. Then, when the plug sleeve 82 is fitted to the outside of the receptacle protrusion 23 in a state where the linear movement sleeve 81 is pulled to a position where the ball receiving groove 81A and the ball hole 82A face each other, the nozzle 84 is inserted into the receptacle protrusion 23. Then, the O-ring 25 seals between the nozzle 84 and the inner surface of the receptacle projection 23.

  Further, when the linear movement sleeve 81 is returned to the origin position with the ball hole 82A facing the plug locking groove 21, the engagement ball 83 engages with the plug locking groove 21 to be in a retaining state. In this state, high-pressure fluid fuel is discharged from the tip of the nozzle 84, and the high-pressure fluid fuel flows in the first shaft center hole 24 of the check valve 10.

  As shown in FIG. 2, a second axial hole 35 is formed through the axial center of the second stem 30, and the outer surface of the second stem 30 is cylindrical in order from the end on the first stem 20 side. The fitting part 31, the stationary platen 32, the tool engaging part 33, and the tank side connection part 34 are provided.

  The tool engaging portion 33 is, for example, a planar regular hexagon, and the tank side connecting portion 34 projects from the center of the end surface. Further, a male screw portion 34A (corresponding to the “fixing portion” of the present invention) is formed on the outer peripheral surface of the tank side connection portion 34. In contrast, as shown in FIG. 1, a female screw 95 </ b> M is formed on the inner surface of the fuel injection port 96 </ b> A of the fuel tank 96. For example, in a state where a seal tape (not shown) is wound around the male screw 34A of the tank side connecting portion 34, the male screw 34A of the tank side connecting portion 34 is screwed to the female screw 95A of the extension pipe 95. The check valve 10 is fixed to the fuel inlet 96A of the fuel tank 96. Note that by engaging a tool such as a spanner with the tool engaging portion 33, the screwing operation between the tank side connecting portion 34 and the fuel injection port 96A can be easily performed.

  The fixed platen 32 projects laterally from the cylindrical fitting portion 31 and the tool engaging portion 33, and a plurality of screw holes 32 </ b> A are penetratingly formed at a plurality of positions on the fixed platen 32. Then, the cylindrical fitting portion 31 of the check valve 10 is fitted into the valve mounting hole 91 from the back side of the back wall 90 of the fuel injection chamber 98 to press the fixing plate 32 against the back surface of the back wall 90 and penetrate the back wall 90. The check valve 10 is fixed to the back wall 90 by tightening the bolts 93 that have passed through the formed screw insertion holes 92 into the screw holes 32 </ b> A of the fixing plate 32.

  As shown in FIG. 2, the second axial hole 35 gradually expands in a stepped shape toward the first stem 20 side, and the inside of the second axial hole 35 is defined by the step surface as a boundary. A female screw portion 35A, a flange fitting portion 35B, an O-ring housing portion 35C, a valve seat fitting portion 35D, a valve body housing portion 35E, and a discharge portion 35F are sequentially formed from the 1 stem 20 side. Further, the step surface between the discharge portion 35F and the valve body housing portion 35E is a spring receiving step surface 50D.

  In the portion of the second axial hole 35 excluding the discharge portion 35F, the valve body biasing spring 50, the valve body 51, the O-ring 52, the valve seat member 53, and the fixing flange 54B are arranged in this order from the female screw portion 35A side. Finally, the male screw portion 26 of the first stem 20 is screwed and joined to the female screw portion 35A. The male screw portion 26 of the first stem 20 and the female screw portion 35A of the second stem 30 are fixed in a screwed state by an adhesive, for example.

  The valve seat member 53 has a cylindrical shape fitted to the valve seat fitting portion 35D, and a through hole 53C is formed in the shaft center portion. An opening facing the spring receiving stepped surface 50D side of the through hole 53C of the valve seat member 53 is a valve port 53A according to the present invention, and an opening edge of the valve port 53A is a valve seat 53B. Yes.

  A backup ring 53 </ b> F is fitted to the upstream end of the outer peripheral surface of the valve seat member 53. Then, the O-ring 52 is accommodated in an annular space between the downstream end surface of the O-ring accommodating portion 35C and the backup ring 53F in a crushed state. Further, a space in the valve body accommodating portion 35E sandwiched between the valve seat member 53 and the spring receiving step surface 50D is a chamber 50B according to the present invention, in which the valve body 51 and the valve body biasing spring 50 are provided. And is housed. Further, the fixed flange 54B is fitted to the flange fitting portion 35B, and the male screw portion 26 of the first stem 20 is fastened to the female screw portion 35A. As a result, the valve seat member 53 and the fixing flange 54B are clamped and fixed between the first and second stems 20 and 30 from the axial direction.

  The valve body 51 is provided with a conical portion 51B on one end surface of the cylindrical portion 51A, and has an embossed portion 51C protruding from the center of the other end surface. And the valve body 51 is made into the state which orient | assigned the embossed part 51C to the spring receiving level | step difference surface 50D side, between the end surface around the embossed part 51C in the cylindrical part 51A of the valve body 51, and the spring receiving level | step difference surface 50D. Thus, the valve body urging spring 50 is in a stretched state and urges the valve body 51 toward the valve port 53A. As a result, the valve port 53A is normally closed by the valve body 51.

  Of the components of the check valve 10 described above, components that constantly receive the pressure of the high-pressure fluid fuel from the fuel tank 96 regardless of whether the valve port 53A is opened or closed, that is, the second stem 30, the valve seat member 53, the valve The body 51 and the valve body urging spring 50 are made of a highly brittle metal (for example, SUH660) having a relatively high brittleness resistance against high-pressure fluid fuel, and other components, that is, the first stem 20 and the filter 54 are It is made of a normal metal (for example, S45C, SUS303) having a relatively low brittleness resistance than a highly brittle metal.

  The description regarding the configuration of the check valve 10 of the present embodiment has been described above, and the operation and effect thereof will be described next. The valve stem 11 included in the fuel injection check valve 10 according to the present embodiment is formed by connecting the first and second stems as described above, and the second stem 30 extends from the first axial hole 24 of the first stem 20. The high pressure fluid fuel is supplied to the fuel tank 96 through the second shaft center hole 35. At this time, the filter 54 fitted in the first shaft hole 24 prevents foreign matter from entering the fuel tank 96, and the valve body 51 and the valve body biasing spring 50 in the second shaft hole 35. This prevents back flow of the high pressure fluid fuel.

  Here, in order to form the chamber 50 </ b> B for accommodating the valve body 51 and the valve body biasing spring 50 in the second shaft hole 35, the second shaft hole 35 is stepped toward the first stem 20 side. The valve seat member 53 is fitted into the valve seat fitting portion 35 </ b> D of the second axial hole 35. Further, the end opening of the cylindrical gap 54E between the filter 54 and the inner surface of the first axial hole 24 is closed, and the filter 54 is protruded laterally in order to keep the filter 54 in a loosely fitted state. The fixed flange 54B is fitted to the flange fitting portion 35B.

  In the check valve 10 of the present embodiment, since the valve seat member 53 is fitted only in the second shaft hole 35, the diameter of the filter 54 can be made larger than before regardless of the valve seat member 53. The pressure loss of the high-pressure fluid fuel can be suppressed, and the fuel supply time can be shortened.

  Of the components of the check valve 10, only those components that are constantly subjected to the pressure of the high-pressure fluid fuel are made of a highly brittle metal, and the first stem 20 and the filter 54, which are other components, are made of a normal metal. Since it comprised, it becomes possible to reduce manufacturing cost, making brittle resistance high. Then, the first stem 20 and the filter 54 are made of a normal metal having a strength higher than that of the hydrogen brittle metal, so that the first stem 20 and the filter 54 are thinned, and the inner diameter of the filter fitting portion 24D is correspondingly reduced. And the outer diameter of the filter 54 can be enlarged. Also in this respect, the filter 54 can be enlarged, the fluid passage area in the filter 54 can be increased, and the maximum flow rate at which high-pressure fluid fuel can be injected can be increased. Furthermore, in the check valve 10 of the present embodiment, if the first stem 20 is removed from the second stem 30 with the high-pressure fluid fuel removed from the fuel tank 96, the second stem 30 is removed from the back wall 90 of the fuel injection chamber 98 and The filter 54, the valve seat member 53, etc. in the check valve 10 can be maintained while being fixed to the extension pipe 95.

[Second Embodiment]
The check valve 10V of the present embodiment is shown in FIG. 3, and the connecting portion between the second stem 30V and the first stem 20V is different from the first embodiment. The second stem 30V of the present embodiment includes a coupling shaft portion 31V on the first stem 20V side from the tool engaging portion 33, and a male screw portion 31N is formed on the outer peripheral surface of the coupling shaft portion 31V. In addition, the O-ring accommodating portion 35C described in the first embodiment is open on the end surface of the coupling shaft portion 31V.

  On the other hand, in the first axial hole 24 of the first stem 20V, a flange fitting portion 63L and a female screw portion 63N are formed on the second stem 30V side from the filter fitting portion 24D. Then, in a state where the fixed flange 54B is fitted to the flange fitting portion 63L, the male screw portion 31N is screwed to the female screw portion 63N, and the first and second stems 20V and 30V are coupled. Further, the first stem 20V is provided with the cylindrical fitting portion 31 of the first embodiment, the cylindrical fitting portion 61 corresponding to the fixed platen 32, and the fixed platen 62, and the fixed platen 62 has a plurality of screw holes 62A. It is formed through. Further, a tool engagement portion 60 having a regular hexagonal cross section is provided between the cylindrical fitting portion 61 and the receptacle protrusion 23. Since the configuration other than the above is the same as that of the first embodiment, a duplicate description is omitted. The check valve 10V of this embodiment also has the same effect as that of the first embodiment.

[Third Embodiment]
The check valve 10W of this embodiment is shown in FIG. 4, and the structure of the second stem 30W is mainly different from that of the second embodiment. Only the configuration different from that of the second embodiment will be described below. The first axial hole 24 of the second stem 30W of the present embodiment gradually increases in a stepped shape as the distance from the first stem 20V increases, and the first axial hole 24 in the first axial hole 24 is bounded by these step surfaces. However, the small diameter portion 71A, the medium diameter portion 71B, and the large diameter portion 71C are sequentially formed from the first stem 20 side. The step surface between the small-diameter portion 71A and the medium-diameter portion 71B is a valve-portion step surface 71D, and the opening of the first axial hole 24 in the valve-portion step surface 71D is the valve port according to the present invention. 53A.

  The plug member 70 according to the present invention is press-fitted into the end portion of the large diameter portion 71C on the medium diameter portion 71B side, and a region between the plug member 70 and the valve opening step surface 71D is a chamber 72. . The plug member 70 is provided as a part of the second stem 30W, and a through hole 70B as a part of the first axial hole 24 of the second stem 30W is formed at the center. Further, an emboss 70A protrudes from the opening edge of the through hole 70B on the surface of the plug member 70 facing the step surface 71D for the valve port. And in the chamber 72, the one end part of the valve body biasing spring 50 is fitted to the outside of the emboss 70A, and the other end part of the valve body biasing spring 50 faces the valve body 51 toward the valve port 53A. Energized. Other configurations are the same as those in the second embodiment.

  In the check valve 10W of the present embodiment, the plug member 70 for forming the chamber 72 is fitted into the second axial hole 35 from the side opposite to the first stem 20V. The diameter of the filter 54 can be made larger than the conventional one, the pressure loss of the high-pressure fluid fuel can be suppressed, and the fuel supply time can be shortened.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the first to third embodiments, the first and second stems are screwed together, but may be joined by press fitting, brazing, welding, or the like.

  (2) In the first embodiment, the check valve 10 mounted on the vehicle is exemplified. However, for example, a fuel tank for a fuel cell installed in a factory or a fuel supply stand for supplying high-pressure fluid fuel is used. A check valve fixed to the fuel inlet is also included in the technical scope of the present invention.

  (3) Although the second stem 30 is connected to the fuel tank 96 via the extension pipe 95 in the check valve 10 of the first embodiment, the second stem 30 may be directly connected to the fuel tank. .

  (4) In the first embodiment, “SUH660” is used as the highly brittle metal, but “SUS420” and “SUS431” may be used as the highly brittle metal. Further, “SUH660” may be used as the highly brittle metal, and “SUS420” and “SUS431” may be used as the normal metal having relatively lower brittleness resistance than “SUH660”.

10, 10V, 10W Fuel injection check valve 11 Valve stem 20, 20V 1st stem 24 1st axial hole 24D Filter fitting part 30, 30V, 30W 2nd stem 35 2nd axial hole 35A Female screw part 35B, 63L Flange fitting portion 35D Valve seat fitting portion 35F Discharge portion 50 Valve body urging spring 50B, 72 Chamber 51 Valve body 53 Valve seat member 53A Valve port 54 Filter 54B Fixing flange 54E Cylindrical gap 70 Plug member 96 Fuel tank 96A Fuel inlet

Claims (3)

A valve stem (11) fixed to a fuel inlet (96A) of a fuel tank (96) for a fuel cell has a first stem (20, 20V) having a first axial hole (24) in the axial center. And a second stem (30, 30V) having a second axial hole (35) in the axial center portion, and a high-pressure fluid fuel from the first axial hole (24) to the second. The fuel tank (96) can be supplied through the axial hole (35), and the filter (54) fitted into the first axial hole (24) from the second stem (30, 30V) side can provide the fuel tank (96). Prevent foreign matter from entering the fuel tank (96)
A valve seat member (53) having a through hole (53C) in the shaft center portion is fitted into the second shaft hole (35) from the first stem (20, 20V) side, and the second shaft center. The chamber (50B) is formed in the middle of the hole (35), the valve body (51) capable of opening and closing the valve port (53A) in the chamber (50B), and the valve body (51) on the valve closing side In the fuel injection check valve (10, 10V) provided with a valve body biasing spring (50) for biasing to prevent back flow of the high-pressure fluid fuel,
The check valve for fuel injection, wherein the valve seat member (53) is fitted only to the second axial hole (35) of the first and second axial holes (24, 35). (10, 10V). One end of the first stem (20V), in which the valve stem (11) fixed to the fuel inlet (96A) of the fuel tank (96) for the fuel cell has the first axial hole (24) in the axial center portion. And a second stem (30W) having a second axial hole (35) in the axial center portion, and the high pressure fluid fuel is transferred from the first axial hole (24) to the second axial hole ( 35), the fuel tank (96) can be supplied to the fuel tank (96) by a filter (54) fitted to the first axial hole (24) from the second stem (30, 30V) side. ) To prevent foreign matter from entering
A plug member (70) having a through-hole (70B) in the shaft center portion is fitted into the second shaft hole (35) from the side opposite to the first stem (20V), and the second shaft hole. The chamber (72) is formed in the middle of (35), the valve body (51) capable of opening and closing the valve port (53A) in the chamber (72), and the valve body (51) is attached to the valve closing side. A fuel injection check valve (10W) comprising a valve body biasing spring (50) for energizing to prevent back flow of high-pressure fluid fuel.   The fuel injection check valve (10) according to claim 1, wherein a fixing portion (34A) for fixing the second stem (30) to the fuel injection port (96A) is provided.

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