JP2003322069A - Flow control member, fuel injection device using it, and manufacturing method for flow control member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flow control member and a fuel injection device using it capable of reducing damage to the inner wall when the throttled flow of an orifice is adjusted and also a dispersion in the flow control characteristics caused by any damage to the inner wall. <P>SOLUTION: A first orifice 51 to throttle the passage section area of a first passage 41 is located apart from the connection part 44 between the first passage 41 and the second passage 42. In the case therefore, a polishing fluid is fed from the end 41a to the second passage 42 via the first orifice 51, the pressure of the polishing fluid with the flowing speed raised by the first orifice 51 lowers before the fluid reaches the second passage 42. A diametrically enlarged part 45 is formed from the first orifice 51 to the connection part 44, so that the flowing speed of the fluid lowers. This reduces the energy which the inner wall 40a receives from the polishing fluid. Accordingly it is possible to reduce damage to the inner wall 40a and a dispersion in the flow control characteristics caused thereby. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate control member, a fuel injection device using the same, and a method for manufacturing the flow rate control member.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Unexamined Patent Publication No. 5-133296, the hydraulic pressure of hydraulic oil introduced into a control chamber is controlled to drive a valve needle and open / close an injection hole. Fuel injection devices are known. In the case of such a fuel injection device, an orifice is provided in the passage communicating with the control chamber in order to control the flow rate of the hydraulic oil that flows into or out of the control chamber.

In the case of the fuel injection device disclosed in Japanese Patent Laid-Open No. 5-133296, orifices are provided on the control chamber side of the radial hole communicating with the control chamber and on the side opposite to the control chamber. The radial hole and the control chamber communicate with each other through the orifice. That is, the orifice of the radial hole on the side of the control chamber communicates with the control chamber, and the central axis of the orifice and the central axis of the control chamber are substantially perpendicular to each other.

[0004]

The throttle flow rate of these orifices is adjusted by fluid-polishing the orifices. That is, by flowing a fluid containing abrasive particles through the orifice, the orifice is adjusted to have a predetermined throttle flow rate. However, since the polishing fluid has its passage cross-sectional area reduced by the orifice and then flows out toward the control chamber, the polishing fluid is jetted to the control chamber side at high pressure. As described above, since the central axis of the orifice and the central axis of the control chamber communicate with each other at a substantially right angle, the fluid containing the abrasive particles that has passed through the orifice and is injected into the control chamber does not reach the inner wall forming the control chamber. collide. As a result, the inner wall facing the orifice is scraped off by the fluid containing abrasive particles, and a recess is formed in the inner wall. This not only reduces the strength of the member in which the orifice and the control chamber are formed, but also causes unevenness in the flow control characteristics because the recess formed in the inner wall is non-uniform for each member in which the orifice is processed. There is.

Therefore, an object of the present invention is to provide a flow rate control member and a fuel injection device using the flow rate control member, in which damage to the inner wall at the time of adjusting the orifice throttle flow rate and variations in flow rate control characteristics due to damage to the inner wall are reduced. To provide. Another object of the present invention is to provide a method for manufacturing a flow rate control member in which damage to the inner wall when adjusting the throttle flow rate of the orifice is reduced and the accuracy of flow rate control of the orifice is improved.

[0006]

According to the flow rate control member of the first aspect of the present invention, the first passage has an orifice at a position apart from the connection portion with the second passage. As a result, when the polishing fluid flows from the first passage to the second passage in order to adjust the throttle flow rate of the orifice, the flow velocity of the high-pressure polishing fluid passing through the orifice decreases before reaching the inner wall forming the second passage. To do. Therefore, it is possible to reduce the damage of the inner wall forming the second passage when adjusting the throttle flow rate of the orifice by the polishing fluid, and the variation of the flow rate control characteristics due to the damage of the inner wall.

According to the second aspect of the flow rate control member of the present invention, the first passage has the enlarged diameter portion on the second passage side of the orifice. The passage cross-sectional area of the expanded diameter portion is larger than that of the orifice. Therefore, the polishing fluid whose flow velocity has increased due to the orifice flows out to the expanded diameter portion, and the flow velocity decreases. Therefore, it is possible to reduce the damage to the inner wall forming the second passage due to the polishing fluid and the variation in the flow rate control characteristics.

According to a third aspect of the present invention, there is provided an orifice forming member for forming an orifice. Therefore, the fine hole processing for the orifice is not necessary and the processing is easy. According to the flow rate control member of the sixth aspect of the present invention, the first passage is formed in a tapered shape. Therefore, the orifice forming member can be easily installed in the first passage.

According to the flow control member of the seventh aspect of the present invention, the central axis of the first passage and the central axis of the second passage form an obtuse angle. Therefore, the polishing fluid whose flow velocity is increased by the orifice collides with the inner wall forming the second passage at a predetermined angle. As a result, a part of the kinetic energy of the polishing fluid is dispersed in the central axis direction of the second passage. Therefore, it is possible to reduce the damage to the inner wall forming the second passage due to the polishing fluid and the variation in the flow rate control characteristics.

According to the ninth aspect of the flow rate control member of the present invention, the central axis of the first passage and the central axis of the second passage are located on substantially the same straight line. Therefore, the polishing fluid whose flow velocity is increased by the orifice flows out into the second passage without colliding with the inner wall forming the second passage. Therefore, it is possible to reduce the damage to the inner wall forming the second passage due to the polishing fluid and the variation in the flow rate control characteristics.

According to the flow rate control member of the eleventh aspect of the present invention, the second passage side of the first orifice and the second orifice face each other. Therefore, when fluid-polishing the first orifice or the second orifice, the polishing fluid whose flow velocity is increased by the first orifice or the second orifice is
The second orifice or the first orifice faces the extension line of the polishing fluid that flows out to the second passage. As a result, the flowing out polishing fluid does not collide with the inner wall forming the second passage. Therefore, it is possible to reduce the damage to the inner wall forming the second passage due to the polishing fluid and the variation in the flow rate control characteristics.

According to the twelfth aspect of the present invention, when the inner diameter of the second passage is D2 and the inner diameter of the orifice is d1, D2> d1. By making the inner diameter D2 of the second passage larger than the inner diameter d1 of the orifice, the flow velocity of the polishing fluid passing through the orifice decreases in the second passage. Therefore, it is possible to reduce the damage to the inner wall forming the second passage due to the polishing fluid and the variation in the flow rate control characteristics.

According to the flow rate control member of the eighth, tenth or thirteenth aspect of the present invention, the first passage has the orifice at a position apart from the connection portion with the second passage. Due to the distance between the orifice and the connecting portion, the flow velocity of the high-pressure polishing fluid passing through the orifice decreases before reaching the inner wall forming the second passage. Therefore, it is possible to reduce the damage to the inner wall forming the second passage due to the polishing fluid and the variation in the flow rate control characteristics. According to a fourteenth aspect of the present invention, there is provided the flow control member according to any one of the first to thirteenth aspects. Therefore, variations in the flow rate control characteristics due to the flow rate control member are reduced, and fuel injection can be controlled with high accuracy.

According to the manufacturing method of the flow rate controlling member of the fifteenth aspect of the present invention, when the throttle flow rate of the orifice is adjusted by the fluid polishing, the polishing fluid is flowed from the second passage to the first passage. That is, the polishing fluid is caused to flow in the opposite direction to the fluid flow when the flow rate control member is used. Therefore, the high-pressure polishing fluid that has passed through the orifice flows out into the first passage and does not collide with the inner wall forming the first passage or the second passage. In the present specification, the throttle flow rate is the flow rate of the fluid that the orifice allows to pass. Therefore, damage to the inner wall during adjustment of the throttle flow rate is reduced,
The accuracy of the flow rate control of the orifice can be improved.

According to the manufacturing method of the flow rate controlling member of the sixteenth aspect of the present invention, after the polishing fluid is flowed from the second passage to the first passage which is in the direction opposite to the direction in which the flow controlling member is used, it is moved in the forward direction. A polishing fluid is flowing from a first passage to a second passage. As a result, the throttle flow rate of the orifice is precisely adjusted according to the flow direction of the fluid during use. Since the polishing fluid is made to flow in the forward direction as a finish of adjusting the throttle flow rate, the polishing fluid is made to flow in the forward direction for a short period of time. Therefore, damage to the inner wall forming the second passage is reduced, and the accuracy of the flow rate control of the orifice can be improved.

According to the method of manufacturing a flow rate control member of the seventeenth or eighteenth aspect of the present invention, the polishing fluid is sucked from the second passage when the throttle flow rate of the orifice is adjusted by the fluid polishing. Therefore, the polishing fluid flowing out to the second passage is bent in the axial direction of the second passage by suction, and the impact given to the inner wall forming the second passage is reduced. Therefore, damage to the inner wall is reduced, and the accuracy of the flow rate control of the orifice can be improved.

According to the method for manufacturing a flow rate control member of the nineteenth or twentieth aspect of the present invention, when the throttle flow rate of the orifice is adjusted by fluid polishing, a predetermined flow rate of fluid is flowed through the second passage. Therefore, the polishing fluid flowing out to the second passage is bent in the axial direction of the second passage by the fluid flowing through the second passage, and the impact given to the inner wall forming the second passage is reduced. Therefore, damage to the inner wall is reduced, and the accuracy of the flow rate control of the orifice can be improved.

Claims 21, 22, 23 or 2 of the present invention
According to the manufacturing method of the flow rate controlling member described in 4, when the throttle flow rate of the first orifice or the second orifice is adjusted by the fluid polishing, the fluid of a predetermined flow rate is caused to flow from the facing second orifice or the first orifice. for that reason,
The polishing fluid flowing from the first orifice or the second orifice into the second passage collides with the fluid flowing from the opposing second orifice or the first orifice, and the kinetic energy of the polishing fluid is offset. Therefore, damage to the inner wall is reduced, and the accuracy of the flow rate control of the orifice can be improved.

According to the method of manufacturing a flow rate control member of the twenty-fifth or twenty-sixth aspect of the present invention, the protector is inserted in the second passage when the throttle flow rate of the orifice is adjusted by fluid polishing. Therefore, the polishing fluid flowing out to the second passage does not collide with the protector and directly collide with the inner wall forming the second passage. Therefore, damage to the inner wall is reduced, and the accuracy of the flow rate control of the orifice can be improved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments showing the embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 2 shows an injector as a fuel injection device according to a first embodiment of the present invention. The injector is
It is inserted into a cylinder head of an engine (not shown) and mounted, and is configured to directly inject fuel into each cylinder of the engine.

The injector 1 is applied to a common rail type fuel injection system. The injector 1 mainly includes a body 10, a nozzle unit 20, an electromagnetic drive unit 30, and a flow rate control member 40. The nozzle section 20 is installed at the end of the body 10 opposite to the electromagnetic drive section 30. The nozzle portion 20 has a nozzle body 21,
A nozzle hole 22 is formed near the tip of the nozzle body 21. A valve needle 23 is housed inside the nozzle body 21 so as to be reciprocally movable in the axial direction.
The valve needle 23 is formed with an abutting portion 23a and can be seated on the valve seat portion 21a formed on the inner peripheral side of the nozzle body 21. The contact portion 23a is the valve seat portion 21a.
When the valve seat portion 21a is separated from the seated or abutting portion 23a, fuel injection from the injection hole 22 is interrupted.
The fuel flowing into the fuel inlet 12 from a common rail (not shown) is supplied to the nozzle portion 20 via the high pressure fuel passage 11 of the body 10.

A valve needle 2 is provided on the inner peripheral side of the body 10.
The control piston 13 that contacts the side opposite to the injection hole 3 is housed. A control chamber 14 is formed on the inner peripheral side of the body 10 on the side opposite to the valve needle of the control piston 13. High-pressure fuel supplied from the fuel inlet 12 via the flow rate control member 40 is stored in the control chamber 14. That is, the fuel accumulated in the control chamber 14 is the valve needle 2
3 is used as hydraulic oil for hydraulically driving. Control room 14
The control piston 13 is driven by the high pressure fuel stored in FIG.
Is urged downward. When the control piston 13 is biased by the fuel in the control chamber 14, the valve needle 23 that abuts the control piston 13 is biased in the injection hole closing direction.
A control means for driving the valve needle 23 from the control piston 13 and the control chamber 14 is configured.

The electromagnetic drive unit 30 is installed at the end of the body 10 opposite to the nozzle unit 20. Electromagnetic drive 3
As shown in FIG. 1, 0 has an electromagnetic valve 31 as a control valve that intermittently discharges the fuel from the control chamber 14. The solenoid valve 31 has a valve body 32 and a ball member 33. A ball member 33 is supported on one end of the valve body 32. The valve body 32 can reciprocate in the axial direction on the inner peripheral side of the support member 34. As shown in FIG. 2, the solenoid valve 3
1 has a coil 35, and a coil 3 from an ECU (not shown) via a terminal (not shown) of a connector 36.
Power is supplied to 5. The valve body 32 is attracted toward the coil 35 against the urging force of the spring 37 by the electromagnetic attraction force generated by the power supplied to the coil 35.

As shown in FIG. 1, the ball member 33 is formed in a spherical shape, a part of which is cut out in a flat shape, and the flat surface portion 33 a can contact the flow rate control member 40. Electric power is supplied to the coil 35 and the valve body 32 is attracted toward the coil 35, so that the ball member 33 is separated from the flow rate control member 40, and the fuel in the control chamber 14 is discharged to the low pressure chamber 38. As a result, the pressure inside the control chamber 14 decreases, and the force that urges the valve needle 23 in the injection hole closing direction decreases. Then, the valve needle 23 is biased in the injection hole opening direction by the fuel pressure in the vicinity of the valve seat portion 21a rather than the force by which the fuel pressure in the control chamber 14 biases the valve needle 23 in the injection hole closing direction. When the strength increases,
The valve needle 23 lifts upward in FIG. When the valve needle 23 is lifted, the contact portion 23a is separated from the valve seat portion 21a, and the fuel is injected from the injection hole 22.

On the other hand, when the energization of the coil 35 is stopped, the valve body 32 moves toward the flow rate control member 40 by the urging force of the spring 37, and the ball member 33 contacts the flow rate control member 40. As a result, the discharge of fuel from the control chamber 14 is stopped, the pressure inside the control chamber 14 increases, and the force that biases the valve needle 23 in the injection hole closing direction increases. Therefore, the valve needle 23 is shown in FIG.
And the contact portion 23a is seated on the valve seat portion 21a. When the contact portion 23a is seated on the valve seat portion 21a, the injection hole 2
The injection of fuel from 2 is stopped.

The fuel inlet 12 is supplied with high-pressure fuel stored in a common rail (not shown) in a pressure-accumulated state. The high-pressure fuel supplied from the common rail is supplied to each part of the injector 1 via the fuel supply passage 15 and the high-pressure fuel passage 11. Part of the supplied fuel is supplied to the control chamber 14, and the other part is supplied to the nozzle unit 20. The fuel discharged from the control chamber 14 to the low pressure chamber 38 and the fuel that has become unnecessary in each part of the injector 1 include a low pressure fuel passage 16 formed in the body 10 and a fuel recovery unit 17 connected to the body 10. Is returned to the outside of the injector 1, for example, to a fuel tank or the like.

Next, the flow rate control member 40 will be described in detail. The flow rate control member 40 is sandwiched between the body 10 and the electromagnetic drive unit 30. One of the flow rate control members 40 faces the control chamber 14 formed in the body 10, and the other faces the electromagnetic valve 31 of the electromagnetic drive unit 30.

A first passage 41 and a second passage 42 are formed in the flow control member 40 as shown in FIG. One end of the first passage 41 communicates with the high pressure passage 18 formed in the body 10, and high-pressure fuel is supplied from the fuel inlet 12. The other end of the first passage 41 communicates with the second passage 42.

One end of the second passage 42 has the first passage 4
It communicates with 1. The other end of the second passage 42 has the low pressure chamber 3 formed in the control chamber 14 and the electromagnetic drive unit 30.
8 can be connected. A valve seat portion 43 is formed around the opening of the second passage 42 on the low pressure chamber 38 side, and the flat surface portion 33 a of the ball member 33 can be seated on the valve seat portion 43. That is, when the flat surface portion 33a of the ball member 33 is seated on the valve seat portion 43, the second passage 42 is closed,
The flow of fuel from the control chamber 14 to the low pressure chamber 38 is shut off. In addition, the flat surface portion 33a of the ball member 33 is attached to the valve seat portion 43
The second passage 42 is opened by separating the valve from, and the flow of fuel from the control chamber 14 to the low pressure chamber 38 is allowed.

The first passage 41 and the second passage 42 are formed in a positional relationship in which the respective central axes intersect substantially vertically. An orifice forming member 50 is installed in the middle of the first passage 41. The orifice forming member 50 has fine holes formed therein, and the fine holes form first orifices 51 for narrowing the passage cross-sectional area of the first passage 41. The first orifice 51 and the first passage 41 are substantially parallel to each other. First passage 41
Is formed in a tapered shape in which the inner diameter decreases from the end on the high pressure passage 18 side to the end on the second passage 42 side. Therefore, the orifice forming member 50 is inserted into the first passage 41 from the end portion 41a of the first passage 41 on the high pressure passage 18 side. Since the first passage 41 is formed in a tapered shape, the orifice forming member 50 is easily inserted into the first passage 41, and the inner diameter of the first passage 41 and the outer diameter of the orifice forming member 50 are substantially the same. The orifice forming member 50 is held in the first passage 41 at the position. The orifice forming member 50 is pushed into the first passage 41 by pushing the orifice forming member 50 further toward the second passage 42 side from the position where the orifice forming member 50 is held in the first passage 41. Fixed. The orifice forming member 50 may be fixed to the first passage 41 by welding after being inserted or press-fitted into the first passage 41.

Since the orifice forming member 50 is installed in the middle of the first passage 41, the first orifice 51 is located away from the connecting portion 44 between the first passage 41 and the second passage 42. Therefore, between the first orifice 51 of the first passage 41 and the connecting portion 44, the enlarged diameter portion 45 having a larger passage cross-sectional area than the first orifice 51 is formed.

The second passage 42 has a second orifice 46 for narrowing the passage cross-sectional area of the second passage 42 near the end on the low pressure chamber 38 side.
have. By adjusting the throttle flow rates of the first orifice 51 and the second orifice 46, the flow of fuel from the control chamber 14 to the low pressure chamber 38 and the flow of fuel from the high pressure passage 18 to the control chamber 14 are controlled. That is,
By making the throttle flow rate of the first orifice 51 smaller than the throttle flow rate of the second orifice 46, when the solenoid valve 31 is opened, the flow of fuel from the high pressure passage 18 to the low pressure chamber 38 is restricted, and Fuel is discharged to the low pressure chamber 38.

Next, the flow rate control member 40 according to the first embodiment.
The manufacturing method of will be described. The plate member serving as the flow rate control member 40 has a first passage 41 and a second passage 42 each having a predetermined shape.
To form. At this time, the first passage 41 is formed in a tapered shape. A second orifice 46 is formed in the second passage 42. When the first passage 41 and the second passage 42 are formed, the polishing fluid is caused to flow through the second passage 42, and the polishing inside the second passage 42 and the throttle flow rate of the second orifice 46 are adjusted.

The polishing fluid is a slurry-like fluid containing a polishing agent, and the inner wall 40a of the flow rate control member 40 forming the second passage 42 is polished by the polishing fluid. By continuously flowing the polishing fluid to the second orifice 46 of the second passage 42, the throttle flow rate of the second orifice 46 is adjusted. That is, the inner diameter of the second orifice 46 is increased and the second orifice 4 is expanded as the polishing fluid flows for a longer period.
The throttle flow rate of 6 increases. Therefore, the second orifice 4
Polishing is performed until the throttle flow rate of 6 reaches a predetermined flow rate.

When polishing the second orifice 46, the polishing fluid is poured into the second passage 42 from the low pressure chamber 38 side of the second passage 42 or the control chamber 14 side. Therefore, the flow rate control member 4 that forms the first passage 41 and the second passage 42 on the axis of the flow of the polishing fluid that passes through the second orifice 46.
There is no zero inner wall, and no inner wall wear occurs.

When the adjustment of the throttle flow rate of the second orifice 46 by the fluid polishing is completed, the orifice forming member 50 is installed in the first passage 41. The orifice forming member 50 is preliminarily formed with pores having an inner diameter corresponding to a predetermined throttle flow rate of the first orifice 51. When the orifice forming member 50 in which the pores are formed is installed in the first passage 41, the throttle flow rate of the first orifice 51 is adjusted. At this time, the polishing fluid is supplied to the end portion 4 of the high pressure passage side 18.
It is poured into the first passage 41 from 1a. The polishing fluid that has flowed into the first passage 41 passes through the first orifice 51 having a narrowed passage cross-sectional area, so that the flow velocity increases.
The polishing fluid that has passed through the first orifice 51 and has an increased flow velocity is ejected from the first orifice 51 toward the second passage 42. Here, in the case of the present embodiment, since the enlarged diameter portion 45 exists between the first orifice 51 and the connecting portion 44 of the first passage 41 and the second passage 42, the flow velocity of the polishing fluid is equal to the passage cross-sectional area. Decreases with expansion. The enlarged diameter portion 45 has a larger passage cross-sectional area than the first orifice 51, and the first orifice 51 and the connecting portion 44 are separated from each other. Therefore, the polishing fluid, which has passed through the first orifice 51 and has a reduced flow velocity due to the enlarged diameter portion 45, forms the second flow path 42 with the flow control member 40.
The flow velocity decreases before reaching the inner wall 40a, and the impact of the polishing fluid on the inner wall 40a is reduced.

As described above, in the flow rate control member 40 of the injector 1 according to the first embodiment of the present invention, the first orifice 51 has the connecting portion 4 between the first passage 41 and the second passage 42.
It is located away from 4. Therefore, the first orifice 5
When the fluid polishing is performed to adjust the throttle flow rate of No. 1, the flow velocity of the polishing fluid passing through the first orifice 51 decreases, and damage to the inner wall 40a of the flow rate control member 40 forming the second passage 42 is reduced. It In addition, the first orifice 51
And the connection portion 44 are separated from each other, the first orifice 51
An enlarged diameter portion 45 having a larger passage cross-sectional area than the first orifice 51 is formed on the second passage 42 side. Therefore, the flow velocity of the polishing fluid passing through the first orifice 51 is equal to that of the expanded diameter portion 45.
The energy received by the inner wall 40a from the polishing fluid is reduced. Therefore, the inner wall 4 formed by the polishing fluid
It is possible to reduce the damage of 0a and the variation in the flow rate characteristics due to the damage.

Further, in the first embodiment, the orifice forming member 50 is installed in the first passage 41. Therefore, it is not necessary to directly machine a fine hole in the flow rate control member 40, and the first orifice 51 can be easily formed. The injector 1 according to the first embodiment of the present embodiment includes a flow rate control member 4
Since the variation of the flow rate characteristic of 0 is reduced, the control room 14
The controllability of the fuel discharged from the low pressure chamber 38 is improved.
Therefore, the fuel injection by the injector 1 can be controlled with high accuracy.

Although the first orifice 51 is formed by the orifice forming member 50 in the first embodiment, it is also possible to directly form the first orifice 51 in the first passage 41 of the flow rate control member 40. In this case, the flow control member 4
Although it is necessary to directly machine the small hole for the first orifice 51 into 0, since the first orifice 51 is located away from the connecting portion 44 between the first passage 41 and the second passage 42, As in the first embodiment, damage to the inner wall 40a of the flow rate control member 40 can be reduced.

(Second Embodiment) FIG. 3 shows an injector flow control member according to a second embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the second embodiment, as shown in FIG. 3, an angle θ formed by the central axis of the first passage 41 and the central axis of the second passage 42.
Is an obtuse angle. In the second embodiment, the first passage 41 has the first orifice 411 at the end on the second passage 42 side.
That is, the first orifice 411 of the first passage 41 is adjacent to the connecting portion 44 of the first passage 41 and the second passage 42.

A method of manufacturing the flow rate control member 40 having the above structure will be described. The adjustment of the throttle flow rate of the second orifice 46 is the same as that in the first embodiment, and the description thereof will be omitted.
When adjusting the throttle flow rate of the first orifice 411,
Similar to the embodiment, the polishing fluid is poured into the first passage 41 from the end portion 41a on the high pressure passage side. As a result, the first passage 4
The polishing fluid that has flowed into No. 1 passes through the first orifice 411 whose passage cross-sectional area is narrowed, so that the flow velocity increases and is jetted toward the second passage 42.

In the case of the second embodiment, since the first passage 41 and the second passage 42 are connected to each other at an obtuse angle, the polishing fluid that has passed through the first orifice 411 forms a flow rate control member forming the second passage 42. It collides with the inner wall 40a of 40 at a predetermined angle. That is, the polishing fluid does not vertically collide with the inner wall 40a forming the second passage 42. Therefore, a part of the kinetic energy of the polishing fluid is contained in the inner wall 40.
a along the central axis of the second passage 42 along the inner wall 4
Kinetic energy in the direction perpendicular to 0a is reduced. As a result, the energy received by the inner wall 40a from the polishing fluid is reduced.

In the second embodiment, the first passage 41 and the second passage 42 are connected at an obtuse angle to reduce the impact of the polishing fluid on the inner wall 40a of the flow rate control member 40 forming the second passage 42. ing. Therefore, it is possible to reduce the damage of the inner wall 40a caused by the polishing fluid and the variation in the flow rate characteristics due to the damage.

Further, in the second embodiment, the first orifice 411 of the first passage 41 is arranged adjacent to the connecting portion 44 of the first passage 41 and the second passage 42, but it is the same as in the first embodiment. The one orifice 411 may be located at a position away from the connecting portion 44 between the first passage 41 and the second passage 42. By locating the first orifice 411 away from the connecting portion 44, damage to the inner wall 40a during fluid polishing of the first orifice 411 can be further reduced as in the first embodiment.

(Third Embodiment) FIG. 4 shows a flow rate control member for an injector according to a third embodiment of the present invention. In the third embodiment, the central axes of the first passage 61 and the second passage 62 of the flow rate control member 60 are located on substantially the same straight line. That is, the angle formed by the central axis of the first passage 61 and the central axis of the second passage 62 is 180 °. First orifice 611
Is located at the connecting portion 63 between the first passage 61 and the second passage 62. Further, in order to position the central axes of the first passage 61 and the second passage 62 on substantially the same straight line, the flow passage control member 60 is connected to the auxiliary passage 64 that constitutes the second passage 62. The auxiliary passage 64 is formed on an extension of the first passage 61, and a part of the auxiliary passage 64 constitutes the second passage 62.
The end of the auxiliary passage 64 opposite to the first passage 61 is sealed by a sealing member 65.

A method of manufacturing the flow rate control member 60 having the above structure will be described. The adjustment of the throttle flow rate of the second orifice 621 is the same as that in the first embodiment, and thus the description thereof is omitted. When adjusting the throttle flow rate of the first orifice 611,
Similar to the first embodiment, the polishing fluid is supplied to the high pressure passage end 61a.
Is poured into the first passage 61. As a result, the polishing fluid that has flowed into the first passage 61 passes through the first orifice 611 whose passage cross-sectional area is narrowed, the flow velocity increases, and the polishing fluid is ejected toward the second passage 62.

In the case of the third embodiment, since the central axes of the first passage 61 and the second passage 62 are located substantially on the same straight line, the polishing fluid that has passed through the first orifice 611 is not absorbed by the second passage 62. Flows out to the auxiliary passage 64 constituting the. Therefore, the polishing fluid has a flow rate controlling member 6 that forms the second passage 62.
It does not collide with the inner wall 60a of 0.

In the third embodiment, since the central axes of the first passage 61 and the second passage 62 are located on substantially the same straight line, the flow rate control member 6 for forming the second passage 62 by the polishing fluid is formed.
It does not collide with the inner wall 60a of 0. Therefore, it is possible to reduce the damage of the inner wall 60a due to the polishing fluid and the variation in the flow rate characteristics due to the damage.

(Fourth Embodiment) FIG. 5 shows a flow rate control member for an injector according to a fourth embodiment of the present invention. In the flow rate control member 70 of the fourth embodiment, the second passage 72 side end 711a of the first orifice 711 of the first passage 71 and the anti-low pressure chamber side end 721a of the second orifice 721 face each other. ing. That is, the first orifice 711 and the second orifice 721 are located opposite to each other with the second passage 72 interposed therebetween.

A method of manufacturing the flow rate control member 70 having the above structure will be described. When the throttling flow rate of the first orifice 711 is adjusted, the polishing fluid is supplied to the high pressure passage end 71a.
Is poured into the first passage 71. As a result, the polishing fluid that has flowed into the first passage 71 passes through the first orifice 711 whose passage cross-sectional area is narrowed, the flow velocity increases, and the polishing fluid is ejected toward the second passage 72. Also, at this time,
An arbitrary fluid is poured into the second orifice 721 from the low pressure chamber side. Therefore, the fluid that has flown into the second orifice 721 passes through the second orifice 721, so that the flow velocity increases and is ejected toward the second passage 72. The fluid that flows into the second orifice 721 is, for example, water.

When the polishing fluid is caused to flow from the first passage 71 to the first orifice 711, the fluid is caused to flow to the second orifice 721, so that the polishing fluid which has passed through the first orifice 711 and jetted to the second passage 72 is It collides with the fluid that has passed through the two orifices 721 and is injected into the second passage 72. The polishing fluid collides with the fluid that has passed through the second orifice 721, so that the kinetic energy is lost before colliding with the inner wall 70a of the flow rate control member 70 that forms the second passage 72 on the extension line of the first orifice 711. To do. Therefore, the energy that the inner wall 70a forming the second passage 72 receives from the polishing fluid passing through the first orifice 711 is reduced.

At this time, the flow rate of the fluid flowing from the second orifice 721 into the second passage 72 is not more than the throttle flow rate of the first orifice 711. The throttle flow rate of the first orifice 711 is adjusted by measuring the flow rate of the polishing fluid that passes through the first orifice 711 and flows into the second passage 72. Therefore, the flow rate of the fluid flowing from the second orifice 721 into the second passage 72 is
When it becomes larger than the throttle flow rate of 1, the first orifice 71
It becomes difficult to measure the flow rate of the polishing fluid that has passed through No. 1 and the throttle flow rate of the first orifice 711 based on the measurement. Therefore, the flow rate of the fluid flowing from the second orifice 721 into the second passage 72 is set to be equal to or smaller than the throttle flow rate of the first orifice 711.

Further, when the throttle flow rate of the second orifice 721 is adjusted, similarly to the case of adjusting the throttle flow rate of the first orifice 711, the end portion 71a of the first orifice 711 on the high pressure passage side is moved to the first orifice 711. An arbitrary fluid such as water is poured. As a result, the polishing fluid injected from the second orifice 721 to the second passage 72 is
It collides with the fluid ejected from the first orifice 711.
Therefore, the energy that the inner wall 70a forming the second passage 72 receives from the polishing fluid that has passed through the second orifice 721 is reduced. Further, at this time, similarly to the adjustment of the throttle flow rate of the first orifice 711 described above, the first orifice 71
The flow rate of the fluid flowing from 1 to the second passage 72 is not more than the throttle flow rate of the second orifice 721.

In the fourth embodiment, the second passage 72 side of the first orifice 711 and the second passage 72 of the first orifice 711.
The side is facing. When adjusting the throttle flow rate of the first orifice 711 or adjusting the throttle flow rate of the second orifice 721, a fluid such as water is ejected from the facing second orifice 721 or the first orifice 711. Therefore, the first orifice 711 or the second orifice 7
The polishing fluid that has passed through 21 is the second orifice 7 facing
21 or the fluid having passed through the first orifice 711 collides with the fluid and loses kinetic energy. Therefore, it is possible to reduce the damage of the inner wall 70a caused by the polishing fluid and the variation in the flow rate characteristics due to the damage.

Further, in the fourth embodiment, the first orifice 7
11 or the second orifice 721, the flow rate of the fluid passing through the opposing second orifice 721 or the first orifice 711 is adjusted to the first orifice 7 when adjusting the throttle flow rate.
11 or the throttle flow rate of the second orifice 721 or less. Therefore, the flow rate of the polishing fluid passing through the first orifice 711 or the second orifice 721 can be easily measured, and the first orifice 711 or the second orifice 7 can be easily measured.
The throttle flow rate of 21 can be adjusted with high accuracy.

In the fourth embodiment, the first orifice 7
The case where the fluid is poured from the opposing second orifice 721 or the first orifice 711 to the second passage 72 when the throttle flow rate of the eleventh or the second orifice 721 is adjusted has been described. However, in the fourth embodiment, since the second passage 72 side of the first orifice 711 and the second passage 72 side of the second orifice 721 are opposed to each other, on the extension line of the flow of the polishing fluid passing through one of the orifices. The other opposing orifice is located at. Therefore, even when the fluid is not poured from the other orifice, the polishing fluid does not directly collide with the inner wall 70a of the flow control member 70, and the inner wall 70a
It is possible to reduce the damage.

(Fifth Embodiment) FIG. 6 shows a flow rate control member for an injector according to a fifth embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the fifth embodiment, as shown in FIG. 6, the first passage 41 has the first orifice 411 at the end on the second passage 42 side.
have. Further, in the fifth embodiment, the inner diameter of the first orifice 411 of the first passage 41 is set to d1, and the second passage 42
Letting the inner diameter of D2 be D2, the relationship of d1 <D2 is established. That is, the inner diameter D2 of the second passage 42 is sufficiently larger than the inner diameter d1 of the first orifice 411.

A method of manufacturing the flow rate control member 40 having the above structure will be described. The adjustment of the throttle flow rate of the second orifice 46 is the same as that in the first embodiment, and the description thereof will be omitted.
When adjusting the throttle flow rate of the first orifice 411, the polishing fluid is poured into the first passage 41 from the end portion 41a on the high pressure passage side. As a result, the polishing fluid poured into the first passage 41 has the first orifice 411 whose passage cross-sectional area is reduced.
As a result, the flow velocity increases and jets toward the second passage 42. However, since the inner diameter D2 of the second passage 42 is larger than the inner diameter d1 of the first orifice 411, the flow velocity of the polishing fluid passing through the first orifice 411 decreases in the second passage 42 having a large inner diameter. Therefore, the energy received from the polishing fluid by the inner wall 40a of the flow rate control member 40 forming the second passage 42 is reduced. Therefore, it is possible to reduce the damage of the inner wall 40a caused by the polishing fluid and the variation in the flow rate characteristics due to the damage.

Further, in the fifth embodiment, the first orifice 41
1 is located at the connecting portion 44 between the first passage 41 and the second passage 42, the first orifice 411 is the connecting portion 44 between the first passage 41 and the second passage 42 as in the first embodiment. May be located away from. This can further reduce damage to the inner wall 40a.

(Sixth Embodiment) FIG. 7 shows a flow rate control member for an injector according to a sixth embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In the sixth embodiment, as shown in FIG. 7, the central axes of the first passage 81 and the second passage 82 are connected substantially vertically. In the sixth embodiment, the first passage 81 has a first orifice 811 at the end on the second passage 82 side. That is, the first orifice 811 of the first passage 81 is located at the connecting portion 83 between the first passage 81 and the second passage 82.

A method of manufacturing the flow rate control member 80 having the above structure will be described. The adjustment of the throttle flow rate of the second orifice 86 is the same as that of the first embodiment, and thus the description thereof is omitted.
When adjusting the throttle flow rate of the first orifice 811, the polishing fluid is poured from the second passage 82 into the first passage 81.
When the flow rate control member 80 is used for the injector 1, the fuel is the high pressure passage 18 shown in FIG. 1 and the first passage 8 shown in FIG.
1, the second passage 82 and the low pressure chamber 38 or the control chamber 14 shown in FIG. Therefore, in the above-described plurality of examples, the polishing fluid was poured in the forward direction along the fuel flow. On the other hand, in the present embodiment, when adjusting the throttle flow rate of the first orifice 811, the polishing fluid is caused to flow in a direction opposite to that when the flow rate control member 80 of the injector 1 is used. That is, the polishing fluid flows from the second passage 82 into the first passage 81 via the first orifice 811.
Since the first orifice 811 and the first passage 81 are substantially parallel to each other, the polishing fluid passing through the second orifice 821 from the second passage 82 collides with the inner wall 80a of the flow rate control member 80 forming the first passage 81. Without flowing out, it flows out to the end portion 81a of the first passage 81 on the high pressure passage side. Therefore, damage to the inner wall 80a of the flow rate control member 80 is reduced.

The final adjustment of the throttle flow rate of the first orifice 811 is more preferably adjusted by the flow of the polishing fluid in the forward direction. Therefore, as described above, the second passage 8
After flowing the polishing fluid from 2 to the first passage 81 in the reverse direction, the polishing fluid is further caused to flow in the forward direction from the first passage 81 to the second passage 82 to adjust the throttle flow rate of the first orifice 811. That is, after the polishing fluid is poured in the reverse direction to set the throttle flow rate of the first orifice 811 approximately, the polishing fluid is poured in the forward direction to set the first orifice 811.
Adjust the throttle flow rate of 11 more precisely. The pouring of the polishing fluid in the forward direction is a short-term operation because it is a finishing step of adjusting the throttle flow rate of the first orifice 811. Therefore, damage to the inner wall 80a of the flow rate control member 80 due to the pouring of the polishing fluid in the forward direction is reduced.

In the sixth embodiment, when the throttle flow rate of the first orifice 811 is adjusted, the polishing fluid is caused to flow in the reverse direction and then the polishing fluid is caused to flow in the forward direction, thereby preventing the inner wall 80a from being damaged by the polishing fluid. The first orifice 81
The throttle flow rate of 1 can be adjusted with high accuracy. In addition,
The sixth embodiment can be applied not only to the flow rate control member 80 having the above configuration but also to the flow rate control members according to the second, third, and fifth examples.

(Seventh Embodiment) FIG. 8 shows a flow rate control member for an injector according to a seventh embodiment of the present invention. In the seventh embodiment, the structure of the flow rate control member 80 is the same as that of the sixth embodiment, and thus the substantially same components are designated by the same reference numerals and the description thereof will be omitted. The seventh embodiment is a flow control member 80.
The manufacturing method is different from that of the sixth embodiment.

A method of manufacturing the flow rate control member according to the seventh embodiment will be described. The adjustment of the throttle flow rate of the second orifice 86 is the same as that of the first embodiment, and thus the description thereof is omitted. When adjusting the throttle flow rate of the first orifice 811, the polishing fluid is poured into the first passage 81 from the end portion 81a on the high pressure passage side as in the first embodiment. As a result, the polishing fluid that has flowed into the first passage 81 passes through the first orifice 811 whose passage cross-sectional area is narrowed, the flow velocity increases, and the polishing fluid is ejected toward the second passage 82.

At this time, a suction pump (not shown) is connected to the end 82a of the second passage 82 on the control chamber side. The end of the second passage 82 on the low pressure chamber side is sealed by a sealing member (not shown). Therefore, the first orifice 8
The polishing fluid that has passed through 11 and is jetted to the second passage 82 is the end portion 8 of the second passage 82 on the control chamber side as shown by the arrow in FIG.
2a is sucked. The suction pressure of the suction pump is constant. As a result, the polishing fluid that has passed through the first orifice 811 and injected into the second passage 82 is sucked toward the control chamber, and the inner wall 8 of the flow rate control member 80 that forms the second passage 82.
Reaching 0a is hindered. As a result, the energy that the inner wall 80a receives from the polishing fluid is reduced, and damage to the inner wall 80a by the polishing fluid can be reduced.

The seventh embodiment can be applied not only to the flow rate control member having the above-mentioned structure but also to the flow rate control members according to the second, third and fifth embodiments. The seventh embodiment can also be applied in combination with the sixth embodiment. Furthermore, when the final adjustment of the flow rate is performed, it is possible to improve the accuracy of the flow rate adjustment by stopping the suction of the polishing fluid by the suction pump.

(Eighth Embodiment) FIG. 9 shows an injector flow control member according to an eighth embodiment of the present invention. In the eighth embodiment, the inclined passage 95 forming the second passage 92 of the flow rate control member 90 communicates with the end 90b of the flow rate control member 90.

A method of manufacturing the flow rate control member according to the eighth embodiment will be described. The adjustment of the throttle flow rate of the second orifice 96 is the same as that of the first embodiment, and the description thereof will be omitted. When adjusting the throttle flow rate of the first orifice 911, the polishing fluid is flown into the first passage 91 from the end portion 91a on the high pressure passage side as in the first embodiment. As a result, the polishing fluid that has flowed into the first passage 91 passes through the first orifice 911 whose passage cross-sectional area is narrowed to increase the flow velocity and is ejected toward the second passage 92.

At this time, an arbitrary fluid such as water is poured into the inclined passage 95 from the end 90b on the side opposite to the control chamber. The fluid flows into the inclined passage 95 from the end 90b as shown by the arrow in FIG. 9, and the end 9 of the second passage 92 on the control chamber side.
It flows to 2a. Therefore, the polishing fluid that has passed through the first orifice 911 and jetted into the second passage 92 is
5 merges with the fluid flowing in 5 and flows to the end 92a on the control chamber side together with the fluid flowing in the inclined passage 95. As a result, the polishing fluid that has passed through the first orifice 911 and injected into the second passage 92 is prevented from reaching the inner wall 90a of the flow rate control member 90 forming the second passage 92. as a result,
The energy that the inner wall 90a receives from the polishing fluid is reduced, and damage to the inner wall 90a by the polishing fluid can be reduced. The flow rate of the fluid flowing through the inclined passage 95 is set to be equal to or smaller than the throttle flow rate of the first orifice 911. The reason for this is the same as the reason explained in the fourth embodiment. When the final flow rate adjustment is performed, the end portion 9 on the side opposite to the control chamber is
It is also possible to improve the accuracy of flow rate adjustment by stopping the pouring of the fluid from 0b.

(Ninth Embodiment) FIG. 10 shows an injector flow control member according to a ninth embodiment of the present invention. In the ninth embodiment, the structure of the flow rate control member is the same as that of the sixth embodiment, so that substantially the same components are designated by the same reference numerals,
The description is omitted. The ninth embodiment differs from the sixth embodiment in the method of manufacturing the flow rate control member 80.

A method of manufacturing the flow rate control member 80 according to the ninth embodiment will be described. The adjustment of the throttle flow rate of the second orifice 86 is the same as that of the first embodiment, and thus the description thereof is omitted.
When adjusting the throttle flow rate of the first orifice 811, the first
Similar to the embodiment, the polishing fluid is flown into the first passage 81 from the end on the high pressure passage side. As a result, the polishing fluid that has flowed into the first passage 81 passes through the first orifice 811 whose passage cross-sectional area is narrowed, the flow velocity increases, and the polishing fluid is ejected toward the second passage 82.

At this time, the protector 1 is provided in the second passage 82.
00 is inserted. The protector 100 has a second passage 82.
Is formed in a shape corresponding to. Protector 100
By being inserted into the second passage 82, the second passage 8
The inner wall 80a on the side opposite to the first orifice of the flow rate control member 80 forming 2 is covered. Therefore, the polishing fluid that has passed through the first orifice 811 and injected into the second passage 82 is protected by the protector 1 before colliding with the inner wall 80 a forming the second passage 82.
Clash with 00. As a result, the polishing fluid that has passed through the first orifice 811 and injected into the second passage 82 is prevented from reaching the inner wall 80a of the flow rate control member 80 that forms the second passage 82. As a result, the energy that the inner wall 80a receives from the polishing fluid is reduced, and the inner wall 80a formed by the polishing fluid is reduced.
Can reduce the damage. The ninth embodiment is
Not only the flow rate control member 80 having the above-described configuration but also any of the above-described embodiments can be combined and applied. Further, when the final adjustment of the flow rate is performed, the accuracy of the flow rate adjustment can be improved by removing the protector 100.

In the above-mentioned embodiments, the flow control member of the present invention is applied to the injector of the common rail type fuel injection system. But,
The present invention is not limited to injectors of a common rail fuel injection system, but can be applied to, for example, a flow rate control member of a fuel pump that needs to control the flow rate by an orifice. It is also possible to combine the flow rate control members individually described in the above-described embodiments.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a flow rate control member of an injector according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view showing an injector according to the first embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a flow rate control member of an injector according to a second embodiment of the present invention.

FIG. 4 is a schematic sectional view showing a flow rate control member of an injector according to a third embodiment of the present invention.

FIG. 5 is a schematic sectional view showing a flow rate control member of an injector according to a fourth embodiment of the present invention.

FIG. 6 is a schematic sectional view showing a flow rate control member of an injector according to a fifth embodiment of the present invention.

FIG. 7 is a schematic sectional view showing a flow rate control member of an injector according to a sixth embodiment of the present invention.

FIG. 8 is a schematic sectional view showing a flow rate control member of an injector according to a seventh embodiment of the present invention.

FIG. 9 is a schematic sectional view showing a flow rate control member of an injector according to an eighth embodiment of the present invention.

FIG. 10 is a schematic sectional view showing a flow rate control member of an injector according to a ninth embodiment of the present invention.

[Explanation of symbols]

1 injector (fuel injection device) 13 control piston (control means) 14 control chamber (control means) 22 injection hole 23 valve needle 31 solenoid valve (control valve) 40, 60, 70, 80, 90 flow control members 41, 61, 71, 81, 91 First passage 42, 62, 72, 82, 92 Second passage 44, 63, 83 Connection portion 45 Expanded diameter portion 46, 621, 721, 86, 96 Second orifice 50 Orifice forming member 51, 411 , 611, 711, 811, 911 First orifice 100 protector

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3G066 AA07 AC09 AD12 BA49 BA51                       BA55 CC01 CC06T CC08U                       CC14 CC68U CC70 CD30                       CE13 CE22 CE35

Claims (26)

[Claims] 1. A flow rate control member having a first passage and a second passage communicating with the first passage, wherein the first passage is separated from a connection portion with the second passage. A flow rate control member having an orifice for narrowing a passage cross-sectional area at a position. 2. A flow rate control member having a first passage and a second passage communicating with the first passage, wherein the first passage has an orifice for narrowing the passage cross-sectional area and the orifice. A flow rate control member, comprising: an enlarged diameter portion having a passage cross-sectional area larger than that of the orifice on the second passage side. 3. The flow rate control member according to claim 1, further comprising an orifice forming member that is installed in the first passage and forms the orifice. 4. The flow rate control member according to claim 3, wherein the orifice forming member is press-fitted into the first passage. 5. The flow rate control member according to claim 3, wherein the orifice forming member is welded to the first passage. 6. The flow rate control member according to claim 3, wherein the first passage is formed in a tapered shape having an inner diameter that decreases toward the second passage. 7. A flow rate control member having a first passage and a second passage communicating with the first passage, wherein the first passage has an orifice for narrowing a passage cross-sectional area. A flow rate control member, wherein the central axis of one passage and the central axis of the second passage form an obtuse angle. 8. The flow rate control member according to claim 7, wherein the first passage has the orifice at a position distant from a connecting portion between the first passage and the second passage. 9. A flow rate control member having a first passage and a second passage communicating with the first passage, wherein the first passage has an orifice for narrowing the passage cross-sectional area, A flow rate control member, wherein a central axis of one passage and a central axis of the second passage are located substantially on the same straight line. 10. The flow rate control member according to claim 9, wherein the first passage has the orifice at a position distant from a connecting portion between the first passage and the second passage. 11. A flow rate control member having a first passage and a second passage communicating with the first passage, wherein the first passage has a first orifice for narrowing a passage cross-sectional area, and the second passage. A flow rate control member, wherein each of the passages has a second orifice for narrowing a passage cross-sectional area, and ends of the first orifice and the second orifice on the second passage side face each other. 12. A flow rate control member having a first passage and a second passage communicating with the first passage, wherein the first passage has an orifice for narrowing the passage cross-sectional area. D2> d1 where D2 is the inner diameter of the two passages and d1 is the inner diameter of the orifice. 13. The flow rate control member according to claim 12, wherein the first passage has the orifice at a position apart from a connecting portion between the first passage and the second passage. 14. A control means having a control chamber for introducing hydraulic oil for urging a valve needle for opening and closing the injection hole in the injection hole closing direction, and a control valve means for opening and closing discharge of the hydraulic oil from the control chamber And controlling the flow rates of the hydraulic oil supplied to the control chamber and the hydraulic oil discharged from the control chamber to the low pressure side.
14. A fuel injection device comprising: the flow control member according to any one of 1 to 13; 15. A first passage, a second passage communicating with the first passage, and an orifice for narrowing the passage cross-sectional area of the first passage are formed, and the first passage is connected to the first passage through the orifice. A method of manufacturing a flow rate control member in which a fluid flows to two passages, wherein a polishing fluid is caused to flow from the second passage to the first passage when the throttle flow rate of the orifice is adjusted by fluid polishing. A method of manufacturing a member. 16. The polishing fluid is caused to flow from the second passage to the first passage, and then the polishing fluid is caused to flow from the first passage to the second passage to adjust the throttle flow rate. 15. The method for manufacturing the flow rate control member according to 15. 17. A method of manufacturing a flow rate control member, comprising: a first passage; a second passage communicating with the first passage; and an orifice for narrowing the passage cross-sectional area of the first passage. Manufacturing a flow rate control member, wherein the polishing fluid is sucked from the second passage when the polishing fluid is caused to flow from the first passage to the second passage via the flow path to adjust the throttle flow rate of the orifice. Method. 18. The method of manufacturing a flow rate controlling member according to claim 17, wherein the polishing fluid is sucked at a constant pressure. 19. A method of manufacturing a flow rate control member, comprising: a first passage; a second passage communicating with the first passage; and an orifice for narrowing the passage cross-sectional area of the first passage. When a polishing fluid is caused to flow from the first passage to the second passage via the flow path to adjust the throttle flow rate of the orifice, a predetermined flow rate of the fluid is caused to flow in the second passage. Production method. 20. The flow rate of the fluid flowing through the second passage is
20. The method of manufacturing a flow rate control member according to claim 19, wherein the flow rate is not more than the throttle flow rate. 21. A first passage, a second passage communicating with the first passage, a first orifice for narrowing the passage cross-sectional area of the first passage, and an opening on the second passage side of the first orifice. A method for manufacturing a flow rate control member, comprising: a second orifice which is arranged substantially opposite to the opening on the second passage side and narrows a passage cross-sectional area of the second passage; When a polishing fluid is flowed from the first passage to the second passage to adjust the throttle flow rate of the first orifice, a predetermined flow rate of the fluid is passed to the second passage via the second orifice. A method for manufacturing a characteristic flow rate control member. 22. The method of manufacturing a flow rate control member according to claim 21, wherein the flow rate of the fluid flowing through the second orifice to the second passage is equal to or less than the throttle flow rate of the first orifice. . 23. When the polishing fluid is flowed to the second passage via the second orifice to adjust the throttle flow rate of the second orifice, the first passage is passed through the first passage to the first passage. 23. The method of manufacturing a flow rate control member according to claim 21, wherein a predetermined flow rate of fluid is flowed through the two passages. 24. The method of manufacturing a flow rate control member according to claim 23, wherein a flow rate of the fluid flowing from the first passage to the second passage is equal to or less than a throttle flow rate of the second orifice. 25. A method of manufacturing a flow rate control member, comprising: a first passage, a second passage communicating with the first passage, and an orifice for narrowing the passage cross-sectional area of the first passage. When adjusting the throttle flow rate of the orifice by flowing the polishing fluid from the first passage to the second passage via the, the second passage, the polishing fluid flowing out from the first passage to the second passage A method of manufacturing a flow rate control member, characterized in that a protector for preventing the collision with the inner wall forming the second passage is inserted. 26. The method of manufacturing a flow rate control member according to claim 25, wherein the protector has a shape along the second passage.