JP2003511610A - Fuel injection valve for an internal combustion engine and method for manufacturing the fuel injection valve - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a plunger-shaped valve member (12) movable axially in one hole (21) against the spring force of at least one closing spring (27, 28). A valve base (2) provided, said valve member (12) controlling the orifice of at least one injection passage (19) at the end close to the combustion chamber, and when the valve opening pressure is reached, The invention relates to a fuel injection valve for an internal combustion engine and a method of manufacturing the fuel injection valve, the type being movable axially by fuel pressure on a pressure shoulder (10) formed on the valve member (12). According to the invention, at least one closing spring (27, 28) is preloaded in a spring chamber (30) formed in the valve carrier (1), and at least one closing spring (27). 27, 28) are supported by one adjusting pin (31, 32) on the side opposite to the combustion chamber. The valve opening pressure defined by the preload of at least one closing spring is adjusted by axially shifting said adjusting pins (31, 32) by means of an adjusting tool (49) which can be introduced through an adjusting hole (52). You. Next, the positions of the adjustment pins (31, 32) in the spring chamber (30) are fixedly positioned by swaging.

Description

Detailed Description of the Invention

TECHNICAL FIELD: As defined in claim 1 as a superordinate concept of the present invention, a plunger-shaped valve member axially movable against the spring force of at least one closing spring is provided inside. A valve retainer, a spring chamber accommodating at least one closing spring, and a pressure-bearing shoulder formed in the valve member, the valve member being guided in a bore over a section of its length, Further, the orifice of the at least one injection passage is controlled at the end of the combustion chamber close to the combustion chamber, and the spring chamber is formed in the valve holding body at a distance from the combustion chamber and near the guided section of the valve member. And the valve member is loaded by at least one closing spring, which is supported at each end on the side facing away from the combustion chamber by a piston-like adjusting pin, said adjusting pin Room remnants Is positioned in the spring chamber by caulking deformation and the pressure-bearing shoulder is loaded with fuel under high pressure, so that at a given valve opening pressure a force greater than the spring force of at least one closing spring is axially applied. The present invention relates to a fuel injection valve for an internal combustion engine of a type adapted to be added to a valve member.

BACKGROUND OF THE INVENTION A fuel injection valve of the type known from DE 41 01 235 A1 is arranged in a spring chamber formed in a valve carrier. There are one closing spring, both closing springs acting against the force of fuel pressure on the valve member. In this case, the first closing spring is clamped between the end of the spring chamber on the side facing away from the combustion chamber and a spring pan which is connected to the valve member via a pressure rod. Second
The closing spring is supported on the side closer to the combustion chamber by a stopper sleeve which can be connected to the valve member, whereas the end on the side opposite the combustion chamber abuts the adjusting pin. A thin portion is formed in the wall of the spring chamber in the region of the adjustment pin, and the thin portion is
It is crimped inward to position the adjustment pin.

In the case of assembling a fuel injection valve, it is performed in the following order. That is: a first closing spring is inserted into the spring chamber, and the closing spring is supported on the spring pan close to the combustion chamber. The valve opening pressure of the first closing spring is adjusted via the length of the pressure rod, and the valve opening pressure of the second closing spring is adjusted via the wall thickness of the compensating disc. In the next assembly step the pressure rod is inserted through the adjusting pin to the spring pan and the second closing spring, the compensating disc and the stopper sleeve are arranged. Finally, the valve base is tightened on the valve holder by the tightening nut, and the valve member is then brought into contact with the pressure rod. In order to check the function, the opening pressures of both closing springs are measured in the assembled fuel injection valve. If the valve opening pressure does not match the set value, the valve body is removed again from the valve holder and the compensating disc and the pressure rod are replaced according to the measurement result. The fuel injection valve is then reassembled,
The valve opening pressure is measured again. This operation is repeated until the valve opening pressure becomes equal to the set value.

The conventionally used method of assembling a fuel injection valve is time consuming and costly. Not only that, but the repeated screw disengagement and reassembly of the fuel injector risks the ingress of dust into the spring chamber and the valve stop region and the impaired function of the fuel injector. In order to prepare the correct dimensions for replacement, it is necessary to make a large number of pressure rods of different length steps or compensating discs of different wall thickness steps. Additional costs are necessarily associated with such stock management.

DISCLOSURE OF THE INVENTION: As described in the characterizing part of claim 1, at approximately the level of the adjusting pin in the valve holder, at least one adjusting hole formed as a through hole in the wall of the spring chamber is provided. A significant advantage obtained by the fuel injection valve of the invention for internal combustion engines, characterized in that it is arranged for introducing and adjusting the axial position of the adjusting pin by the adjusting tool, As is clear from the comparison with the prior art, both closing springs are respectively supported on one adjusting pin on the side facing away from the combustion chamber, which adjusting pin can be positioned by deformation of the wall surrounding it. Yes, and before final positioning, it is axially shifted in the spring chamber by the adjusting tool, which makes it possible to adjust the valve opening pressure without replacing the parts of the fuel injection valve.

In a first advantageous embodiment, at least two inward caulking holes are formed in each height level of the adjusting pin. This ensures that the adjusting pin is swaged at a specific position in the spring chamber.

In another advantageous embodiment, at least one annular rib is formed on the outer peripheral surface of the adjusting pin, which rib is inside the residual wall between the bottom of the caulking hole and the spring chamber. Is press-fitted in and thus a better positioning of the adjusting pin is achieved.

In another advantageous embodiment, the adjusting hole for introducing the adjusting tool into the spring chamber is formed substantially perpendicular to the longitudinal axis of the valve member, which is technically simple and It can be realized at low cost. The adjusting tool in this case has an obliquely chamfered shape at the end of the tool part introduced into the adjusting hole, whereby the adjusting tool
During movement into the adjusting hole, it slides along an oblique chamfer which is advantageously formed on the side of the adjusting pin facing away from the combustion chamber. This applies an axial force to the adjusting pin.

In a further advantageous embodiment, the adjusting hole is inclined with respect to the longitudinal axis of the valve member, in particular at an angle of about 45 °, whereby a high axial force is exerted on the adjusting pin. It will be possible. In that case, the end of the adjusting tool is rounded and chamfered, which is advantageous as it allows the adjusting tool to slide along the adjusting pin during shifting of the adjusting pin in the spring chamber.

In a further advantageous embodiment, the end face of the adjusting pin facing away from the combustion chamber is convexly curved outwards. This forms a bevel on the adjusting pin, on which the adjusting tool can engage when the adjusting pin is axially shifted.

It is also advantageous to manufacture the fuel injection valve by inserting the adjusting pin into the spring chamber and finally assembling the other parts of the fuel injection valve. The adjusting pin in the spring chamber is conveniently shifted and the valve opening pressure is adjusted accurately without the need to replace fuel injector parts or re-disassemble or reassemble the fuel injector. .

Other advantages and advantageous embodiments of the fuel injection valve and the method for manufacturing the same according to the invention can be easily conceived based on the drawings, the detailed description of the drawings and the claims.

[0013]   BEST MODE FOR CARRYING OUT THE INVENTION:   Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a fuel injection valve according to the invention for an internal combustion engine in a longitudinal section. This fuel injection valve has a valve holder 1 to which a valve base 2 is tightened by a tightening nut 3 with an intermediate disc 5 interposed. A hole 21 is formed in the valve body 2 in which an axially movable plunger-shaped valve member 12 is provided. The valve member 12 is formed in a section of the hole 21 on the side opposite to the combustion chamber. You are being guided. By narrowing the valve member 12 towards the combustion chamber, the valve member 12 is formed with a pressure-receiving shoulder 10, which is arranged in the pressure chamber 7 surrounding the pressure-receiving shoulder. Has been done. The pressure chamber 7 can communicate with a fuel high pressure source (not shown) via the valve base 2, the intermediate disk 5, and the inflow passage 4 formed in the valve holder 1.

The end of the valve member 12 close to the combustion chamber is formed as a valve sealing surface 14, which cooperates with a valve seat 17 formed in the valve body 2. At least one injection passage 19 is arranged in the valve seat 17, the injection passage being closed by the valve sealing surface 14 in the closed position of the valve member 12 and in the open position of the valve member 12. It is possible to communicate with the pressure chamber 7 via a ring passage 16 formed between the valve member 12 and the hole 21. At the end of the valve member 12 facing away from the combustion chamber, a pressure rod 37 loaded by a first closing spring 27 abuts, which pressure rod with respect to the longitudinal axis 13 of the valve member 12. Spring chamber 30 formed in the valve holding body 1 and disposed substantially coaxially with each other.
It has invaded inside.

FIG. 2 shows an enlarged sectional view of a region portion of the intermediate disk 5 shown in FIG. Since the diameter of the pressurizing rod 37 is smaller than that of the guided section of the valve member 12, the ring shoulder 11 is formed at the portion where the valve member 12 moves to the pressurizing rod 37.
During the opening stroke movement, the ring shoulder 11 of the valve member 12 bears against the stopper sleeve 8, which surrounds the pressure rod 37 and is guided in the intermediate disc 5. The stopper sleeve 8, which can also be composed of multiple parts, extends into the spring chamber 30, and the end of the stopper sleeve on the side opposite to the combustion chamber is
In the form of a spring tray, one end of a second closing spring 28 rests against the spring tray, which brings the valve element 12 into the closed position. A stopper shoulder 25 is formed on the outer peripheral surface of the stopper sleeve 8 due to the reduction of the cross section, and the stopper sleeve 8 is brought into contact with the stopper surface 26 formed on the intermediate disk 5 during the stroke movement by the stopper shoulder 25. Contact. This limits the maximum valve opening stroke of the valve member 12. Stopper sleeve 8 near the combustion chamber
The end surface 23 of the valve contacts the end surface 22 of the valve base 2 under the action of the second closing spring 28.

A piston-shaped first adjusting pin 31 is arranged near the end of the spring chamber 30 on the side opposite to the combustion chamber, and at a substantially midpoint between both ends of the spring chamber 30. A piston-shaped second adjusting pin 32 is arranged. The second adjusting pin 32 in this case has a central hole, which serves as a guide for the pressure rod 37. First and second
The adjusting pins 31 and 32 are positioned in the spring chamber 30 by caulking.
Between the first adjusting pin 31 and the spring pan 24, which is arranged at the end of the pressure rod 37 facing away from the combustion chamber, a first spring which is preferably embodied as a compression coil spring is provided. A closing spring 27 is arranged with a preload. Correspondingly, a second closing spring 28, which is preferably embodied as a compression coil spring, is preloaded between the second adjusting pin 32 and the spring receptacle formed on the stop sleeve 8. Are arranged. The spring chamber 30 is connected to an outflow passage (not shown) via a leak oil passage 36 formed in the valve holder 1.

On the wall of the spring chamber 30, the height level of the first adjusting pin 31 and the second adjusting pin 32 are set.
At each height level there is formed at least one caulking hole 43 formed as a blind hole, each caulking hole forming a thin, easily deformable residual wall 46 of the spring chamber wall. One or a plurality of annular ring ribs 40 are formed on the outer peripheral wall surfaces of both adjusting pins 31, 32, and a residual wall remaining between the bottom of the caulking hole 43 and the spring chamber 30 is formed in the ring ribs. 46 is press-fitted. One adjusting hole 52, which is formed as a through hole, is formed at each height level of the ends of the adjusting pins 31, 32 opposite to the combustion chamber.

FIG. 3 is an enlarged view of a region of the first adjustment pin 31 shown in FIG. The side of the adjusting pin 31 opposite to the combustion chamber is formed in a conical shape, which forms an oblique chamfer 33. A hole 55 is formed concentrically with the axis of the adjusting pin 31, through which leak oil can flow from the spring chamber 30 to the leak oil passage 36. The adjustment hole 52 is formed in the radial direction toward the center of the valve holder 1 and is substantially perpendicular to the axis of the adjustment pin 31. The adjusting tool 49 is introduced through the adjusting hole 52, and the portion of the adjusting tool 49 inserted into the adjusting hole 52 is formed in a substantially rod shape, and the end thereof is cut off obliquely. By the movement of the adjusting tool 49 into the spring chamber, the adjusting tool is brought into contact with the oblique chamfered portion 33 of the adjusting pin 31. Due to the further movement of the adjusting tool 49, the oblique cut-off of the adjusting tool 49 slides on the oblique chamfer 33, thereby axially shifting the adjusting pin 31 towards the combustion chamber with respect to the adjusting pin 31. Power is generated.

FIG. 4 shows an alternative embodiment of the adjusting hole 52, in which case the adjusting hole has an angle of 30 ° to 60 ° with respect to the axis of the adjusting pin 31, in particular Advantageously 4
It has an angle of 5 °. The portion of the adjusting tool 49 introduced into the adjusting hole 52 is chamfered with its end portion rounded, and is brought into contact with the oblique chamfered portion 33. By pushing the adjusting tool 49 towards the adjusting pin 31, the adjusting pin 31 is axially shifted towards the combustion chamber. In that case, the adjustment tool 49 is the beveled chamfer 3
Glide along 3. Further, the adjustment in the case of the second adjustment pin 32 is similarly performed through the single or plural adjustment holes 52.

According to an alternative embodiment to the adjusting pin 31 shown in FIGS. 3 and 4, the side of the adjusting pin 31 facing away from the combustion chamber has a different shape than the conical shape. It is also possible to form a convex curved surface. Similarly, the adjustment tool 49 is not simply formed by obliquely cutting it off as shown in FIG. 3, but by an oblique cutting-off of another form, an oblique cutting-off part is formed along the oblique chamfered part 33 of the adjusting pin 31. It is also possible to make it slidable. In order to equalize the supporting force for the adjusting pins 31 or 32, a plurality of adjusting holes 52 are arranged symmetrically around the axis of the spring chamber 30,
It is also possible to use them simultaneously for adjustment.

The functional mode of the fuel injection valve is as follows. That is: At the start of the injection cycle, fuel is introduced under high pressure through the inflow passage 4 into the pressure chamber 7. As a result, an axial force that separates from the combustion chamber is generated on the pressure receiving shoulder 10. This is because the valve member 12 is moved by the first closing spring 27 via the pressure rod 37 at the valve sealing surface 14 to the valve seat 1.
Since the fuel pressure in the pressure chamber 7 reaches the valve opening pressure and the force exerted on the pressure receiving shoulder 10 becomes larger than the spring force of the first closing spring 27, the fuel injection valve is pressed against the fuel injection valve 7. Open the valve. Due to the separation of the valve sealing surface 14 from the valve seat 17, the injection passage 19 communicates with the pressure chamber 7 via the ring passage 16 and fuel is injected into the combustion chamber. In the closed state of the fuel injection valve, since there is an axial distance between the ring shoulder 11 and the stopper sleeve 8, the initial part of the valve opening stroke movement of the valve member 12 is the first closing spring 27. Only done against the spring force. When the ring shoulder 11 comes into contact with the stopper sleeve 8, the stopper sleeve 8 will be attached to the valve member 1 during a further valve opening stroke movement.
Taken by 2 This requires a relatively large force. This is because the spring force of the second closing spring 28 now also counteracts the opening stroke movement of the valve member 12. The ring shoulder 11 of the valve member 12 is the stopper sleeve 8
The valve member 12 remains in this position. Staying in this position is due to the following fuel, into the pressure chamber 7, via the force of the ring shoulder 10, both closing springs 27,
Until a high fuel pressure builds up that can counteract the spring force of 28.
In the subsequent valve opening stroke movement, the stopper sleeve 8 contacts the stopper surface 26 with the stopper shoulder 25, and the valve opening stroke movement ends. The spontaneous ignition internal combustion is performed by the valve opening stroke motion performed against the closing force of one closing spring at the start of valve opening and against the spring force of the two closing springs (27, 28) after the partial stroke has passed. Especially when using the fuel injection valve of the invention in an engine, a favorable injection process is formed. The closing stroke movement of the fuel injection valve is
It is initiated by a reduction in the fuel pressure in the pressure chamber 7 until the force on the can no longer fully oppose the spring force of the two closing springs 27, 28. The valve member 12 is moved toward the valve seat 17 via the stopper sleeve 8 and the pressure rod 37 until the valve member 12 again contacts the valve seat 17 with the valve sealing surface 14 to close the injection passage 19. Is accelerated toward.

Next, a method of manufacturing the above fuel injection valve will be described. Both adjusting pins 31, 32 are arranged in the spring chamber 30 and are axially shiftable in the spring chamber 30. In conjunction with this, the remaining components are arranged in the spring chamber 10 at the above-mentioned positions, and the valve base 2 is tightened to the valve holder 1 by the tightening nut 3 with the intermediate disc 5 interposed. The adjusting tool 49 is introduced through the adjusting hole 52 of the first adjusting pin 31 and the first adjusting pin 31 is shifted against the spring force of the first closing spring 27 into one position. Then, the valve opening pressure generated by the first closing spring 27 is measured, on the basis of which the axial position of the first adjusting pin 31 is adjusted by shifting with the adjusting tool 49 in response to the measurement result. It is possible to correct the position of the pin 31 or the set valve opening pressure. If the measured valve opening pressure of the fuel injection valve is too high, the adjusting pin 31 must be moved away from the combustion chamber, and if it is too low, it must be moved correspondingly toward the combustion chamber. This corrective action is repeated until the desired valve opening pressure is set at the fuel injection valve.

Alternatively, it is also possible to continuously measure the valve opening pressure via a suitable device when the adjusting pin 31 is shifted. In order to position the first adjusting pin 31 in the optimum position found, the adjusting pin 31 is then crimped by pressing the residual wall 46 of the caulking hole 43 into the spring chamber 30 in the manner described above. . After crimping, the adjusting tool 49 is removed from the adjusting hole 52 and the adjusting hole 52 is closed. This blockage can be performed, for example, by pressing one hard ball into the adjusting hole 52. The same method is used to position the second adjustment pin 32.

Instead of exerting an adjusting force on the adjusting pins 31, 32 via the bevel of the adjusting tool 49, the adjusting tool can also have a cam-shaped molding at the end introduced into the spring chamber. In this case, the adjusting force on the adjusting pin is generated by rotating the adjusting tool.

It is also possible to apply the manufacturing method described above to a fuel injection valve of the type in which only one closing spring is arranged in the spring chamber 30. It is also possible to arrange two or more closing springs in the spring chamber 30 and to set the valve opening pressure of the closing springs by shifting the adjusting pin as described above.

[Brief description of drawings]

[Figure 1]   It is a longitudinal cross-sectional view of the fuel injection valve provided with two closing springs.

FIG. 2 is an enlarged cross-sectional view of a region portion of an intermediate disc surrounded by a chain line circle II in FIG.

[Figure 3]   It is an expanded sectional view of the adjustment pin area | region part of the 1st closing spring shown in FIG.

[Figure 4]   It is sectional drawing equivalent to FIG. 3 which showed the adjustment hole and the adjustment tool in alternative embodiment.

[Explanation of reference numerals] 1 valve holder, 2 valve base, 3 tightening nut, 4 inflow passage,
5 intermediate disk, 7 pressure chamber, 8 stopper sleeve, 10 pressure receiving shoulder, 11 ring shoulder, 12 valve member, 13 vertical axis of valve member,
14 valve sealing surfaces, 16 ring passages, 17 valve seats, 19 injection passages, 21 holes, 22 valve base end surfaces, 23 stopper sleeve end surfaces, 24 spring trays, 25 stopper shoulders, 26 stopper surfaces, 27 first closing springs , 28 second closing spring, 30 spring chamber,
31 Piston-shaped first adjustment pin, 32 Piston-shaped second adjustment pin, 33 Diagonal chamfered portion, 36 Leakage oil passage, 37 Pressure rod,
40 ring rib, 43 caulking hole, 46 residual wall, 49 adjusting tool, 52 adjusting hole, 55 hole

─────────────────────────────────────────────────── ─── [Continued summary] It is fixedly positioned by.

Claims (16)

[Claims] 1. A valve holder (1) having a plunger-shaped valve member (12) axially movable against the spring force of at least one closing spring (27, 28) and at least one A spring chamber (30) for accommodating a closing spring (27, 28) and a pressure-receiving shoulder (10) formed in the valve member (12), the valve member (12) being a segment of its length. Over the interior of the bore (21) and at its end close to the combustion chamber controls the orifice of the at least one injection passage (19), the spring chamber (30) being the valve carrier. The valve member (12) is formed near the guided section of the valve member (12) separated from the combustion chamber in (1).
The adjusting pin (31) is loaded by at least one closing spring (27, 28) supported on one piston-like adjusting pin (31, 32) at the end opposite the combustion chamber. , 32) are positioned in the spring chamber (30) by caulking deformation of the residual wall (46) of the spring chamber (30), and the pressure-receiving shoulder (10) is loaded with fuel under high pressure, which causes a predetermined opening. In a fuel injection valve for an internal combustion engine of the type in which a valve pressure exerts a force in the axial direction on the valve member (12) that is greater than the spring force of the at least one closing spring (27, 28), At least one adjusting hole (52) formed as a through hole in the wall of the spring chamber (30) at approximately the level of the adjusting pins (31, 32) in the holding body (1) has an adjusting tool (49).
A fuel injection valve for an internal combustion engine, characterized in that the fuel injection valve is installed to adjust the axial position of the adjusting pin (31, 32) by the adjusting tool. 2. The residual wall (46) of the valve carrier (1) is substantially adjusted by the adjusting pin (31,
32) is formed by at least one caulking hole (43) shaped as an inward blind hole at a height level of 32), wherein said residual wall (46) is caulking said adjusting pin (31, 32). The fuel injection valve according to claim 1, which is pressed inward when tightened. 3. At least one annular rib (40) is formed on the outer peripheral surface of the adjusting pin (31, 32), and the rib is internally formed when the adjusting pin (31, 32) is caulked and tightened. The fuel injection valve according to claim 1, wherein the fuel injection valve is press-fitted into a residual wall (46) which is pressed in the direction. 4. The fuel injection valve according to claim 2, wherein the caulking hole (43) is located substantially perpendicular to the longitudinal axis (13) of the valve member (12). 5. The fuel injection valve according to claim 1, wherein the adjusting hole (52) extends radially into the spring chamber (30) from the outer peripheral surface of the valve holder (1). 6. The fuel injection valve according to claim 5, wherein the adjusting hole (52) is formed substantially perpendicular to the longitudinal axis (13) of the valve member (12). 7. The adjusting hole (52) is formed at an angle of 30 ° to 60 °, in particular about 45 °, with respect to the longitudinal axis (13) of the valve member (12). The fuel injection valve described. 8. Fuel injection according to claim 5, characterized in that a plurality of adjusting holes are arranged in the valve holder (1), in particular symmetrically arranged about the longitudinal axis of the spring chamber (30). valve. 9. The fuel injection valve according to claim 1, wherein the adjusting pin (31, 32) has a hollow cylindrical shape. 10. The fuel injection valve according to claim 1, wherein the side of the adjusting pin (31, 32) opposite to the combustion chamber has a convexly curved shape. 11. The adjusting pin (31, 32) has a conical shape on the side opposite to the combustion chamber, and the conical point of the conical body faces away from the combustion chamber. The fuel injection valve according to item 1. 12. The tool part of the adjusting tool (49) introduced into the adjusting hole (52) is formed substantially in the shape of a rod, and the introducing end is cut off obliquely. The fuel injection valve described. 13. A tool part of an adjusting tool (49) introduced into the adjusting hole (52) is substantially rod-shaped, and the introducing end of the adjusting tool is rounded and chamfered. The fuel injection valve according to item 1. 14. A valve retainer (1) having a plunger type valve member (12) axially movable against the spring force of at least one closing spring (27, 28),
A spring chamber (30) accommodating at least one closure spring (27, 28) and a pressure-receiving shoulder (10) formed in the valve member (12), the valve member (12) comprising:
It is guided in a hole (21) over a section of its length and is adapted to control the orifice of at least one injection passage (19) at its end close to the combustion chamber, said spring chamber (30) is formed near the guided section of the valve member (12) in the valve holding body (1) so as to be separated from the combustion chamber, and the valve member (12) is separated from the combustion chamber. One piston-like adjusting pin (31, 3) at each of the opposite ends
2) is loaded by at least one closing spring (27, 28) carried by said adjusting pin (31, 32) and said residual wall (46) of said spring chamber (30).
Is positioned in the spring chamber by the crimping deformation of the
0) is loaded by the fuel under high pressure, so that at a given valve opening pressure, a force greater than the spring force of the at least one closing spring (27, 28) is axially exerted on the valve member (1).
In a method for manufacturing a fuel injection valve for an internal combustion engine of the type adapted to be added to 2), the adjustment pin (31, 32) is positioned before the adjustment pin (31, 32) is positioned.
), The preloading force of the closing springs (27, 28) abutting the adjusting pin (12) is reached until the desired valve opening pressure of the valve member (12) is reached. 32) A method for manufacturing a fuel injection valve for an internal combustion engine, characterized in that 32) is adjusted by an adjusting tool (49). 15. A tool (49) insertable through the wall of the spring chamber (30),
By shifting the contact surface acting axially on the adjusting pin (31, 32) against the valve opening force acting on the valve member (12), the adjusting pin (31, 32) is moved.
The method according to claim 14, wherein 32) is shifted. 16. An adjusting hole (52) formed in a wall of a spring chamber (30).
The adjusting tool (49) is introduced through the adjusting pin (31,
32), and (b) the adjusting pin (31, 31) by the adjusting tool (49).
32) is axially shifted, and at the time of the shift, the valve opening pressure of the fuel injection valve is measured until the valve opening pressure of the fuel injection valve becomes equal to the set value, and (c) the adjustment pin (31, 32).
The remaining wall (46) of the spring chamber (30) located at the height level of
The adjustment pin (31, 32) is positioned at that position, and (d) the adjustment hole (52
15. The method according to claim 14, wherein the adjusting tool (49) is removed from