JPH11141719A - Assembling method for relief valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set valve opening pressure to a desired value with a high accuracy, in relation to an assembling method of a relief valve. SOLUTION: In a fluid passage 42 formed on an inlet side of a valve assembling body 70 for composing a linear solenoid, air having high pressure comparing with desired valve opening pressure is supplied through a throttle 96, an air supply piping 92, and an air supply passage 84 from an air source 98. A fluid passage 38 formed on an outlet side of the valve assembly body 70 is opened to the atmosphere through an air delivery passage 86 and an air delivery piping 100. Pressure Pa in the air supply piping 94 detected by a pressure sensor 94 is equal with a pressure difference between the fluid passage 38 and the fluid passage 42, namely, it is equal with valve opening pressure of the linear solenoid. In a valve seat 40, pressure Pa is pressed in by a push-press member 88 until that the pressure Pa is matched with the desired valve opening pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for assembling a relief valve, and more particularly to a method for assembling a relief valve suitable for setting a valve opening pressure with high accuracy.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 7-28012
The solenoid valve disclosed in No. 2 is known. The conventional solenoid valve includes a plunger provided so as to be displaceable in an axial direction, a valve body provided at one end of the plunger, and a valve seat having a valve seat and fixed to the guide block by press-fitting. I have. When the plunger is urged by the spring, the valve body is pressed toward the valve seat with a force equal to the urging force of the spring. When the fluid pressure applied in the valve opening direction of the solenoid valve exceeds the pressing force between the valve body and the valve seat, the valve body separates from the valve seat, and the solenoid valve opens. That is, the above-mentioned conventional solenoid valve functions as a relief valve having a valve opening pressure proportional to the urging force of the spring.

[0003] In the above-mentioned conventional manufacturing process of a solenoid valve, a valve seat is press-fitted in a direction in which a valve seat faces a valve body.
Therefore, as the press-fit amount of the valve seat increases, the contraction deformation amount of the spring in the valve-closed state increases,
The pressing force between the valve body and the valve seat increases. Therefore, in the above-described conventional manufacturing process of the solenoid valve, the valve opening pressure can be set to a desired value by determining the press-fit amount of the valve seat based on the urging force generated by the spring.

[0004]

However, the magnitude of the valve opening pressure depends on the pressing force between the valve body and the valve seat, that is, the urging force generated by the spring, and the area (the area where the fluid pressure acts on the valve body). Hereinafter, referred to as pressure receiving area). Therefore, even if the biasing force of the spring is set to a desired value, if the pressure receiving area changes due to variations in component dimensions or the like, the valve opening pressure will also change. In this regard, the above-described conventional method of manufacturing a solenoid valve that sets the valve opening pressure based on the biasing force of the spring is not optimal in setting the valve opening pressure with high accuracy.

The present invention has been made in view of the above points, and has as its object to provide a method of assembling a relief valve capable of setting a valve opening pressure to a desired value with high accuracy.

[0006]

The above object is achieved by the present invention.
As described in the above, a method for assembling a relief valve including a valve seat and a valve body biased toward the valve seat, wherein a predetermined fluid pressure is applied in a direction to open the relief valve. And a second step of adjusting a positional relationship between the valve seat and the valve element based on a valve opening pressure of the relief valve. Achieved by the method.

In the present invention, in the first step, a fluid pressure is applied in a direction in which the relief valve opens. In the second step, the positional relationship between the valve seat and the valve element is adjusted based on the valve opening pressure of the relief valve. When the positional relationship between the valve seat and the valve body is adjusted, the urging force of the valve body toward the valve seat changes, so that the valve opening pressure of the relief valve changes. Therefore, by performing the second step, the valve opening pressure can be set to a desired value.

According to a second aspect of the present invention, in the method of assembling a relief valve according to the first aspect, the predetermined fluid pressure is higher than a desired valve opening pressure of the relief valve. High pressure, and the second step is a third step of detecting a differential pressure between the upstream side and the downstream side of the relief valve, and the differential pressure matches the desired valve opening pressure. Thus, the fourth step of adjusting the positional relationship between the valve seat and the valve body is achieved by the method of assembling the relief valve.

In the present invention, in the first step, a fluid pressure higher than the desired valve opening pressure is applied in a direction to open the relief valve. In the third step, the pressure difference between the upstream side and the downstream side of the relief valve is detected, and in the fourth step, the valve seat and the valve element are adjusted so that the differential pressure matches a desired valve opening pressure. Is adjusted. When a fluid pressure higher than the valve opening pressure is applied in the direction in which the relief valve is opened, the differential pressure is equal to the valve opening pressure of the relief valve. Therefore, by performing the fourth step, the valve opening pressure of the relief valve is set to a desired value.

Further, the object of the present invention is to provide a method of assembling a relief valve according to claim 1, wherein the predetermined fluid pressure is equal to a desired valve opening pressure of the relief valve, and , The second step is a third step of detecting the flow rate of the fluid flowing through the relief valve,
A fourth step of adjusting the positional relationship between the valve seat and the valve element until the flow rate reaches zero is also achieved by a method of assembling a relief valve.

In the present invention, in the first step, a fluid pressure equal to a desired valve opening pressure is applied in a direction to open the relief valve. Therefore, when the valve opening pressure of the relief valve is smaller than the desired valve opening pressure, the relief valve opens and the fluid flows through the relief valve. In the third step, the flow rate of the fluid flowing through the relief valve is detected, and in the fourth step, the positional relationship between the valve seat and the valve element is adjusted until the flow rate reaches zero. The valve opening pressure of the relief valve is a fluid pressure applied in a direction to open the relief valve when the flow rate of the fluid flowing through the relief valve starts increasing from zero. Therefore, by performing the fourth step, the valve opening pressure of the relief valve is set to a desired value.

The above object is also a method of assembling a relief valve including a valve seat and a valve body biased toward the valve seat, wherein the valve seat is provided. A first step of temporarily adjusting a positional relationship between the first valve and the valve body;
A second step of measuring a valve opening pressure of the relief valve at at least two points in the step, a valve opening pressure at the at least two points, and an adjustment amount of the positional relationship between those points. A third step of determining a final adjustment amount-related value of the positional relationship based on the value, and a fourth step of adjusting the positional relationship based on the final adjustment amount-related value. This is more effectively achieved by the method of assembling a relief valve having the following.

In the fourth aspect of the present invention, when the positional relationship between the valve seat and the valve body is temporarily adjusted in the first step, the urging force of the valve body toward the valve seat changes, thereby providing relief. The valve opening pressure of the valve changes. In general, the characteristic indicating the relationship between the valve opening pressure of the relief valve and the positional relationship between the valve element and the valve seat varies depending on the individual difference of the relief valve. That is, the amount of adjustment of the positional relationship between the valve element and the valve seat for obtaining a desired valve opening pressure differs depending on the individual difference of the leaf valve. On the other hand, in the present invention, in the third step, the valve opening pressure at at least two points in the process of temporarily adjusting the positional relationship between the valve seat and the valve body, and the position between those points. A final adjustment amount-related value of the positional relationship between the valve seat and the valve element is determined based on the adjustment amount-related value of the relationship. As a result, fluctuations in characteristics based on individual differences of the relief valves are compensated, and a final adjustment amount-related value for obtaining a desired valve opening pressure is accurately determined. In the fourth step, the valve opening pressure is set to a desired value with high accuracy by adjusting the positional relationship between the valve seat and the valve element based on the final adjustment amount-related value. . Further, in the fourth step, the positional relationship between the valve seat and the valve element can be adjusted based on the final adjustment amount-related value without monitoring the fluid pressure, the flow rate, and the like. Can be done quickly.

[0014]

FIG. 1 is a sectional view showing the structure of a linear solenoid 10 according to an embodiment of the present invention. As shown in FIG. 1, the linear solenoid 10 includes a sleeve 12. The sleeve 12 is a cylindrical non-magnetic member having one end (the right end in FIG. 1) closed. A skirt portion 1 having an opening diameter larger toward the end portion is provided at an open end of the sleeve 12.
4 are formed. An electromagnetic coil 16 and a yoke 18 are provided around the sleeve. The yoke 18 is a member made of a magnetic material.

A core 20, a plunger 22, and a guide 24 are inserted into the sleeve 12 in order from the closed end. The core 20, the plunger 22, and the guide 24 are members made of a magnetic material. The core 20 and the guide 24 are press-fitted and fixed inside the sleeve 12. The guide 24 has a through hole 26 penetrating the center and a tapered portion 28 on the outer peripheral surface. The guide 24 has an outer peripheral surface of the tapered portion
Until it comes into contact with the skirt portion 14 of the sleeve 12. On the other hand, the plunger 22 is
2 are inserted so as to be displaceable in the axial direction.

The core 20 has a cylindrical opening 30 that opens leftward in FIG. A spring 32 for urging the plunger 22 leftward in FIG. 1 is provided in the cylindrical opening 30. As a result, a predetermined length of air gap is formed between the core 20 and the plunger 22. Therefore, the displacement of the plunger 22 inside the sleeve 12 is restricted within the range of the predetermined air gap length. A large-diameter portion 30 a is provided at the entrance of the cylindrical opening 30 of the core 20. On the other hand, a projection 22 a is provided on the bottom surface of the plunger 22 on the side facing the core 20. As the plunger 22 is displaced toward the core 20, the protrusion 22a
Enters the large diameter portion 30a. Further, a shaft 34 that passes through the through hole 26 of the guide 24 is fixed to the plunger 22.

One end of the guide 24 (left end in FIG. 1)
Is formed with a cylindrical portion 36. Guide 24
Is provided with a fluid passage 38 that communicates the internal space of the cylindrical portion 36 with the external space of the cylindrical portion 36. Guide 24
A valve seat 40 is press-fitted into the inside of the cylindrical portion 36 from the left end side in FIG. A fluid passage 42 is provided at the center of the valve seat 40. Fluid passage 42
An orifice 44 is provided at an end of the guide 24 on the side communicating with the inside of the cylindrical portion 36. Orifice 4
A valve seat 46 formed in the shape of a conical surface is provided at an opening of the cylindrical portion 36 inside the cylindrical portion 36. A poppet 48 provided at one end (the left end in FIG. 1) of the shaft 34 faces the valve seat 46. As described above, the plunger 22 is biased leftward in FIG. Therefore, when the electromagnetic coil 16 is not energized, the poppet 48 is pressed against the valve seat 46, and the orifice 44 is closed.

The linear solenoid 10 includes a valve housing 50
Attached to. The valve housing 50 has a valve mounting hole 52. A backup ring storage space 54 is provided in the opening of the valve mounting hole 52. The guide 24 of the linear solenoid 10 is inserted into the valve mounting hole 52 until the step surface between the cylindrical portion 36 and the tapered portion 28 contacts the step surface between the valve mounting hole 52 and the backup ring storage space 54. Have been. Valve seat 40
An O-ring 5 is provided between the outer peripheral surface of the
6 are provided. The guide 24 is formed by the O-ring 56.
The sealability between the fluid passage 38 and the fluid passage 42 outside the cylindrical portion 36 is ensured. The linear solenoid 10 is fixed to the valve housing 50 by the backup ring 58 being hooked on the backup ring housing space 54.

According to the configuration of the linear solenoid 10 described above, when the electromagnetic coil 16 is not energized, the orifice 44 is closed by the poppet 48 as described above, so that the fluid passage 38 and the fluid passage 42 are connected. Communication is interrupted. On the other hand, when the electromagnetic coil 16 is energized, the magnetic flux generated by the electromagnetic coil 16 circulates through a magnetic circuit including the yoke 18, the core 20, the plunger 22, and the guide 24. Electromagnetic force acts to reduce the air gap between the core and the core 20. This electromagnetic force is transmitted to the poppet 48 via the shaft 34 against the urging force of the spring 32, and displaces the poppet 48 in a direction away from the valve seat 46.

In this case, as described above, as the plunger 22 is displaced toward the core 30, the projection 22a of the plunger 22 enters the large diameter portion 30a of the cylindrical opening 30. When the projection 22a enters the large diameter portion 30a, a part of the magnetic flux circulating in the magnetic circuit escapes from the projection 22a to the large diameter portion 30a. The escape amount of the magnetic flux increases as the amount of the protrusion 22a entering the large-diameter portion 30a increases. As a result, the magnetic flux increases due to the decrease in the air gap between the plunger 22 and the core 20, and the large-diameter portion 30
The electromagnetic force acting on the plunger 22 when the amount of current supplied to the electromagnetic coil 16 is kept constant is offset by the increase in the escape of the magnetic flux to a, and the electromagnetic force acting on the plunger 22 becomes substantially constant regardless of the amount of displacement of the plunger 22. Therefore, the displacement of the plunger 22, that is, the displacement of the poppet 48, can be linearly controlled by changing the amount of current supplied to the electromagnetic coil 16. The flow rate of the fluid flowing through the orifice 44 is
It increases as the displacement of the poppet 48 increases.
Therefore, the flow rate of the fluid flowing from the fluid passage 42 toward the fluid passage 38 can be controlled by changing the amount of current supplied to the electromagnetic coil 16.

When the pressure in the fluid passage 42 becomes higher than the pressure in the fluid passage 38, the poppet 48
A pressure equal to the pressure difference ΔP acts in a direction away from the valve seat 46. FIG. 2 is a diagram schematically illustrating a state in which the differential pressure ΔP acts on the poppet 48. As shown in FIG. 2 by diagonal lines, the pressure difference acts on a predetermined area of the poppet 48. Hereinafter, the area of the region where the differential pressure ΔP acts is referred to as “pressure receiving area S”. Therefore, when the differential pressure ΔP occurs, a force having a magnitude equal to F = ΔP · S acts on the poppet 48 in a direction away from the valve seat 46. And
When the force F exceeds the biasing force of the spring 32, the poppet 48 moves away from the valve seat 46, and the hydraulic passage 42 and the hydraulic passage 38 communicate with each other through the orifice 44.

As described above, in the linear solenoid 10 of the present embodiment, the pressure on the fluid passage 42 side is higher than the pressure on the fluid passage 38 side by a predetermined valve opening pressure _Po = F / S. It also functions as a relief valve that opens in such cases. In order to properly function as a relief valve of the linear solenoid 10 is required to accurately set the valve opening pressure P _o to a desired value. As described above, the valve opening pressure P _o is equal to F / S. As Therefore, if it is possible to pressure-receiving area S is considered to be constant, by adjusting the magnitude of the biasing force F of the spring 32, it is possible to set the valve opening pressure P _o to a desired value as described above It is.

The setting method of the valve opening pressure P _o is specifically executed by the steps shown in FIGS. 3-6. That is, first, as shown in FIG. 3, in a state in which the core 12, the plunger 22 to which the shaft 34 is fixed, and the sleeve 12 to which the spring 32 is assembled are held such that the closed end thereof faces downward. downward load F _s is applied to the poppet 48. The load F _s is such that F _s = P _oc · S with respect to the desired value P _oc of the valve opening pressure P _o, it is adjusted by using, for example, a load cell. And
In a state where a load F _s is applied, the air gap between the core 20 and the plunger 22, i.e., vertical stroke amount S ₁ of the poppet 48 is detected.

After the detection of the stroke amount S ₁ is completed, as shown in FIG. 4, the guide 24 is moved by the indenter 60 of the press-fitting machine.
Is press-fitted into the sleeve 12 to a predetermined position, and then the valve seat 40 is provisionally press-fitted. Next, as shown in FIG. 5, the electromagnetic coil 16 and the yoke 18 are disposed around the sleeve 12 into which the valve seat 40 has been temporarily press-fitted. Then, in a state where the energization to the electromagnetic coil 16 is repeatedly turned on and off, the displacement amount of the poppet 48 is adjusted by the dial gauge 64 via, for example, a small-diameter pin 62 arranged to penetrate the orifice 44. is measured, the stroke amount S ₂ of the poppet 48 on the basis of the measurement value is detected.

Finally, as shown in FIG. 6, the difference between the stroke amounts (S ₂ -S
_The valve seat 40 is further press-fitted by an amount equal to ₂ ). Thus, the air gap between the core 20 and the plunger 22 is set at an equal size to S _1. In this state, the elastic contraction of the spring 32 is equal to the value in a state where a load F _s on the poppet 48 shown in FIG. 3 has been given, therefore, the urging force of the spring 32 occurs load F
matches _s . In this manner, according to the method shown in FIGS. 3 to 6, the valve opening pressure P _o of the linear solenoid 10 desired value P _oc
Can be set to

However, as described above, FIGS.
The conventional method shown shows that the pressure receiving area S of the poppet 48 is constant.
It is assumed that there is. On the other hand, the pressure receiving area S
Is the variation in the processing accuracy of the poppet 48 and the valve seat 46, etc.
Will vary. Therefore, according to the above conventional method,
Valve opening pressure P of the linear solenoid 10_oIs necessarily the desired value P
_ocCannot be set with high accuracy.

In the above conventional method, the pressure receiving area
Even if S is constant, the valve opening pressure P _oSet to high accuracy
Load F_sAnd stroke S₁, S_TwoWith high precision
Need to measure. In particular, the spring constant of the spring 32
Suppresses the generation of vibration during the operation of the linear solenoid 10
Is set so high that the biasing force of the spring 32
To set the stroke accurately, the stroke S₁, S_TwoThe high precision
Measurement is required. However, as shown in FIG.
Stroke S_TwoIs measured in the orifice 44
Small diameter pipe to measure the displacement of the poppet 48 through the
Pin 62 must be used.
Measurement accuracy is reduced.

Further, in the above conventional method, as described above,
First, a load F _s measured stroke S ₁ in a state of being applied to the poppet 48 (FIG. 3), then press-fitting machine guide 2
After 4 and was injected valve seat 40 (FIG. 4), removed from the press-fitting machine to measure the stroke S ₂ (FIG. 5), again, press-fitting the valve seat 40 by a pressure machine that (FIG. 6) 4
Two steps are required. Therefore, the time required for assembling the linear solenoid 10 is increased, that involves attachment and detachment of the press-fitting machine, it is possible to lower the setting accuracy of the valve opening pressure P _o.

[0029] In contrast, the method of assembling the linear solenoid 10 in this embodiment, without being affected by the variation of such the above pressure-receiving area S, and a simple process, high the valve opening pressure P _o The feature is that the accuracy can be set.
Hereinafter, a method of assembling the linear solenoid 10 according to the present embodiment will be described. In the present embodiment, in the state that the valve assembly 70 in the manufacturing process of the linear solenoid 10 is assembled, setting the valve opening pressure P _o of the linear solenoid 10 is performed by press-fitting machine 72. FIG. 7 shows that the valve assembly 70
FIG. 3 shows a cross-sectional view of a state where the press-fitting machine 72 is installed.

The assembling process of the valve assembly 70 shown in FIG. 7 is as follows. That is, first, the core 20 is pressed into the inside of the sleeve 12 until it reaches the closed end.
Next, after the spring 32 is inserted into the cylindrical opening 30 of the core 20, the plunger 22 to which the shaft 34 is fixed in advance is inserted into the sleeve 12. Next, the guide 24 is pressed into the sleeve 12 with the shaft 34 passing through the through hole 26 until the outer peripheral surface of the tapered portion 28 contacts the skirt portion 14 of the sleeve 12. Then, the valve seat 40 is temporarily press-fitted into the cylindrical portion 36 of the guide 24 to such an extent that the valve seat 46 and the poppet 48 do not come into contact with each other, whereby the assembly of the valve assembly 70 is completed.

After [0031] valve assembly 70 is assembled as described above, as the valve opening pressure P _o is the desired value P _oc, the valve seat 40 is press-fitted to a final position. Hereinafter, a process of setting the valve opening pressure _Po to the desired value _Poc by adjusting the press-fit amount of the valve seat 40 will be described with reference to FIG. As shown in FIG.
4 is provided. The work table 74 has a set hole 76. The valve assembly 70 is inserted into the set hole 76 with the closed end of the sleeve 12 facing downward.
Above the work table 74, a sealed case 78 is provided so as to surround the cylindrical portion 36 of the guide 24 and the valve seat 40. Guide 24 and sealed case 7
8, O-rings 80 and 82 are provided.
The O-rings 80 and 82 ensure the sealing property between the fluid passage 42 and the fluid passage 38 outside the guide 24.

The sealed case 78 is provided with an air supply passage 84 and an air discharge passage 86. A pressing member 88 is inserted into the upper part of the closed case 78. The pressing member 88 can slide in the vertical direction by a displacement amount specified from the outside while maintaining the airtight state of the sliding portion with the sealing case 78. The end surface of the pressing member 88 is in contact with the end surface of the valve seat 40. Of the pressing member 88,
A flow path 90 is provided on an end face that comes into contact with the valve seat 40. The air supply passage 84 and the fluid passage 42 inside the valve seat 40 are formed by a pressing member 88 and the valve seat 4.
In a state where 0 is in contact with each other, they communicate with each other via the flow path 90. Further, the air discharge passage 86 communicates with the fluid passage 38 formed in the guide 24.

In the air supply passage 84, an air supply pipe 92 is provided.
Is connected. The air supply pipe 92 has
Pressure P_aIs provided.
The air supply pipe 92 is connected to an air source via an orifice 96.
98. The air source 98 is a linear solenoid
Valve opening pressure P of 10_oDesired value P_ocPressure P higher than _H
Output air. On the other hand, the air discharge passage 86
The discharge pipe 100 is connected. Air discharge piping 100
Is open to the atmosphere.

As described above, in the initial state of the valve assembly 70, the valve seat 40 is temporarily press-fitted so that the poppet 48 does not contact the valve seat 46. For this reason, the pressure P _H
Is supplied to the fluid passage 42 through the air supply pipe 92 and the air supply passage 84, the air
8 and the valve seat 46, the fluid passage 38 of the guide 24, the air discharge passage 86, and the air discharge pipe 100
It is released into the atmosphere via. In this case, the fluid passage 4
Since the pressure difference hardly occurs between the fluid passage 2 and the fluid passage 38, and the fluid passage 38 is opened to the atmosphere via the air discharge passage 86 and the air discharge pipe 100, the pressure in the fluid passage 38 is reduced. Equal to atmospheric pressure. Accordingly, the pressure P _a of the air supply pipe 92 is almost identical to the atmospheric pressure.

In this state, when the pressing member 88 is displaced downward, the valve seat 40 is
Is gradually pressed into the inside of the cylindrical portion 36. Then, when the valve seat 40 is press-fitted until the gap between the poppet 48 and the valve seat 46 becomes a small size equal to or less than a predetermined amount, the air flows through the fluid passage 42 due to the flow resistance when the air passes through the gap. A pressure difference ΔP is generated between the fluid passage 38 and the fluid passage 38. In this case, since the pressure of the fluid passage 38 is matched to the atmospheric pressure, the pressure P _a of the air supply pipe 92, the differential pressure Δ
It becomes a value equal to P.

The press-fitting position of the valve seat 40 at which the differential pressure ΔP starts to coincide with the position where the poppet 48 and the valve seat 46 just come into contact with each other when no pressure is applied to the fluid passage 42. Hereinafter, this position will be referred to as the valve seat 40.
Is referred to as a reference position. When the valve seat 40 is further press-fitted from the reference position, the gap between the poppet 48 and the valve seat 46 is reduced, thereby increasing the air flow resistance when passing through the gap, The pressure ΔP increases.
An urging force corresponding to the differential pressure ΔP acts on the poppet 48 in a direction against the urging force of the spring 32.
Therefore, the poppet 48 is displaced downward with the press-fit of the valve seat 40, and the poppet 4
An amount of shrinkage equivalent to a displacement of 8 occurs. Therefore, the differential pressure ΔP and the amount of contraction deformation of the spring 32 are proportional to each other. In this case, the valve seat 40
The change in the gap between the poppet 48 and the valve seat 46 due to the press-fitting is sufficiently small compared to the displacement of the poppet 48, and the press-fitting amount of the valve seat 40 and the contraction deformation of the spring 32 are substantially equal. Can be considered. Therefore, the differential pressure Δ
P increases almost in proportion to the press-fit amount of the valve seat 40.

[0037] Figure 8 illustrates a press-fitting amount x from a reference position of the valve seat 40, the relationship between the pressure P _a of the air supply pipe 92. As described above, because it matches the pressure P _a and the differential pressure [Delta] P, as shown in FIG. 8, the pressure P _a of the air supply pipe 92 is substantially pressed amount x from the reference position of the valve seat 40 proportional And change. Note that the pressure difference between the pressure P _A in the air supply pipe 92 and the pressure P _H of the air source 98 is
Generated by That is, the throttle 96 is connected to the valve assembly 7.
By restricting the flow rate of the air flowing through 0, it has a role of preventing pressure loss of air in flow paths such as the air supply pipe 92 and the air discharge pipe 100.

By the way, as described above, the differential pressure ΔP between the fluid passage 42 and fluid passage 38 exceeds the valve opening pressure P _o of the linear solenoid 10, the linear solenoid 10 is opened. In a state where the linear solenoid 10 is opened, there is no possibility that the differential pressure ΔP between the fluid passage 42 and fluid passage 38 exceeds the valve opening pressure P _o. For this reason, the valve opening pressure P
differential pressure ΔP in a situation where the pressure P _H is supplied exceeding _o,
That is, the pressure P _a will correspond to the valve opening pressure P _o.

Therefore, according to the present embodiment, the pressure sensor 9
While monitoring the pressure P _a of the air supply pipe 92 detected by 4, gradually pressed into the valve seat 40, the pressure P
_a is by stopping the press-fit when it reaches a value equal to the desired value P _oc of the valve opening pressure P _o, it is possible to set the opening pressure P _o of the linear solenoid 10 to a desired value P _oc. Thus, according to this embodiment, based on the valve opening pressure P _o of the linear solenoid 10, by adjusting the press-fitting of the valve seat 40, to set the valve opening pressure P _o to the desired value P _oc Can be. That is, according to the assembling method of the linear solenoid 10 of the present embodiment, without interposing error factors such as a pressure-receiving area S of the poppet 48, directly, the press-fitting of the valve seat 40 based on the valve opening pressure P _o By making adjustments,
The setting of the valve opening pressure P _o is possible to perform with high accuracy.

Further, in this embodiment, the pressure P _a of the air air source 98 is output sufficient if a high pressure to the desired value P _oc of the valve opening pressure P _o, accurate control of the pressure P _a It is not necessary to do it. Therefore, according to the present embodiment, the cost of the air source 98 can be reduced, and as a result, the assembly cost of the linear solenoid 10 can be reduced.

Further, in this embodiment, the valve assembly 70
Can be in a state where installation was into the press machine 72, sets the valve opening pressure P _o in one step of press-fitting the valve seat 40 while monitoring the pressure P _a of the air supply pipe 92 by the pressure sensor 94 . That is, according to this embodiment, it is possible to carry out on all the adjustment of the valve opening pressure P _o pressed machine 72, together with the assembling time of the linear solenoid 10 is shortened, the attachment and removal of the press-fitting machine 72 setting accuracy of the valve opening pressure P _o in association with being prevented from being lowered. Moreover, and dial gauge for measuring the stroke of the poppet 48, device such as a load cell for detecting a load applied to the poppet 48 that becomes unnecessary, the valve opening pressure P _o
Can be reduced in cost for equipment for performing the setting.

By the way, the valve seat 40 and the guide 24
If a seal failure occurs on the press-fitting surface between the cylindrical portion 36 and the seating surface between the poppet 48 and the valve seat 46, air leaks between the fluid passage 42 and the fluid passage 38 when the linear solenoid 10 is closed. Will occur. In this case, regardless of the press-fit amount of the valve seat 40, a certain amount or more of air always flows from the fluid passage 42 to the fluid passage 38. Such air flow, reduces the pressure P _a of the air pipe 92, the pressure P does not reach to the desired valve opening pressure P _o. Therefore, in this embodiment, even if the valve seat 40 is press-fitted over a certain amount or more, the air supply pipe 92
If the pressure P _a of does not reach the desired valve opening pressure P _o can be determined that such above seal failure occurs. As described above, according to the assembling method of the present embodiment, it is also possible to detect a seal failure of the linear solenoid 10.

In the above embodiment, the valve assembly 7
When assembling 0, poppet the valve seat 40
48 and the degree to which the valve seat 46 does not contact, that is, the reference position
Although it was assumed that it was temporarily press-fitted so that it did not reach
Valve opening pressure P of 70_oIs the desired value P _ocEven if it does not reach
If the temporary press-fit position of the valve seat 40 exceeds the reference position,
Is also good. In this case, in the initial state of the valve assembly 70,
Pressure will be generated in the air supply pipe 92,
Pressure P_AIs the desired valve opening pressure P_ocUntil the valve seat
40 may be press-fitted.

In the above embodiment, the air source 98
The first step according to claim 1 and 2 by but supplying air output pressure P _H in the fluid passage 42 detects the pressure P _a of the air supply pipe 92 using pressure sensor 94 4 the third step according to claim 2, and claim 2 by press-fitting the valve seat 40 until the pressure P _a reaches the desired value P _oc of the valve opening pressure P _o by
Are realized respectively.

Next, a method of assembling the linear solenoid 10 according to the second embodiment of the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view showing a state where the valve assembly 70 is installed on the press-fitting machine 72. In FIG. 9, the same components as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. The procedure for assembling the valve assembly 70 is the same as that in the first embodiment.

As shown in FIG. 9, an air supply pipe 120 is connected to the air supply passage 84 of the sealed case 78. An air source 122 communicates with the air supply pipe 120. . Air source 122 outputs air pressure equal to the desired value P _oc of the valve opening pressure P _o to air supply pipe 120. An air discharge pipe 124 is connected to the air discharge passage 86. The air discharge pipe 124 is provided with a flow rate sensor 126 for detecting an air flow rate Q flowing through the inside of the air discharge pipe 124.
An end of the air discharge pipe 124 is open to the atmosphere.

According to this configuration, when a gap is formed between the valve seat 46 and the poppet 48, the pressure _Poc supplied to the fluid passage 42 via the air supply pipe 120 and the air supply passage 84 is _reduced . The air passes through the upper gap and is discharged into the atmosphere via the fluid passage 38, the air discharge passage 86, and the air discharge pipe 126. In this case, air having a flow rate Q corresponding to the size of the gap between the valve seat 46 and the poppet 48 flows through the air discharge pipe 124. In the present embodiment, based on the air flow rate Q flowing through the air discharge pipe 126, to set the opening pressure P _o of the linear solenoid 10. FIG. 10 shows the relationship between the press-fit amount x from the reference position of the valve seat 40 and the flow rate Q.

As shown in FIG. 10, when the press-fit amount of the valve seat 40 increases, the gap between the poppet 48 and the valve seat 46 decreases, and the air flowing through the valve assembly 70 is reduced in accordance with the decrease in the gap. The flow rate, that is, the flow rate Q of the air flowing through the air discharge pipe 124 decreases. And poppet 4
When the valve seat 40 is press-fitted until the seat 8 is seated on the valve seat 46, a state where the flow rate Q reaches zero is formed. The valve opening pressure _Po of the linear solenoid 10 is
When the flow rate of the fluid flowing through 0 starts increasing from zero,
The pressure difference ΔP between the fluid passage 38 and the fluid passage 42.
That is, the valve opening pressure P when the flow rate Q reaches zero
_o will be equal to its desired value _Poc . For this reason, according to the present embodiment, while monitoring the flow rate Q of the air flowing through the air discharge pipe 124 by the flow rate sensor 126, the valve seat 4
0 By press-fitting the, it is possible to set the valve opening pressure P _o to the desired value P _oc.

[0049] As described above, in the present embodiment, when the air flow rate Q flowing through the air exhaust pipe 124 is zero, using the valve opening pressure P _o is equal to the desired value P _oc, valve The press-fit amount of the sheet 40 is controlled. That is, also in this embodiment, as in the first embodiment, directly, so that the press-fitting of the valve seat 40 is determined based on the valve opening pressure P _o. Therefore, in this embodiment,
A flow sensor 1 in place of the pressure sensor 94 of the first embodiment.
By using 26, it is possible to set the valve opening pressure P _o with high precision to a desired value P _oc.

Also in this embodiment, the press-fitting surface between the valve seat 40 and the cylindrical portion 36 of the guide 24, or
When a poor seal occurs on the seating surface between the poppet 48 and the valve seat 46, the flow rate Q does not become zero regardless of the press-fit position of the valve seat 40. Therefore, according to the present embodiment, if the flow rate Q does not become zero even when the valve seat 40 is press-fitted by a certain amount or more, it can be determined that the above-described seal failure has occurred. As described above, according to the assembling method of the present embodiment, it is possible to detect a defective seal of the linear solenoid 10.

[0051] Further, according to this embodiment, as in the case of the first embodiment, when it is installed a linear solenoid 10 into the press machine 72, in that it can perform the setting of the valve opening pressure P _o , with assembling time of the linear solenoid 10 is shortened, lowering the precision of setting the valve opening pressure P ₀ is prevented. In the above-described embodiment, the flow rate of the air flowing through the air discharge pipe 126 on the downstream side of the valve assembly 70 is detected. However, the present invention is not limited to this. The flow rate of the air flowing through the supply pipe 120 may be detected.

In the above embodiment, the air source 12
The first step described in claims 1 and 3 detects the flow rate Q of the air flowing through the air discharge pipe 124 by the flow rate sensor 126 by supplying the air having the pressure _Poc output by the second 2 to the fluid passage 42. The third step according to claim 3 is performed until the flow rate Q reaches zero.
The fourth step described in claim 3 is realized by press-fitting 0.

Next, a method of assembling the linear solenoid 10 according to the third embodiment of the present invention will be described. FIG.
FIG. 9 is a cross-sectional view showing a state where the valve assembly 70 is set on the press-fitting machine 72. In FIG. 11, the same components as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. The procedure for assembling the valve assembly 70 is the same as that in the first embodiment.

As shown in FIG. 11, an air supply pipe 150 is connected to the air supply passage 84 of the sealed case 78. The air supply pipe 150, a pressure sensor 152 for detecting the pressure P ₁ of the interior are arranged. Air piping 1
50 communicates with an air source 154. Air source 154
Outputs air having an adjustable pressure to the air pipe 150.

The air discharge passage 86 has an air discharge pipe 15
6 are connected. The air discharge pipe 156, the pressure sensor 158 for detecting the pressure P ₂ therein is disposed. The air discharge pipe 156 is further provided with a flow sensor 160 for detecting a flow rate Q of air flowing through the inside of the air discharge pipe 156. An end of the air discharge pipe 156 is open to the atmosphere.

FIG. 12 shows a linear solenoid in this embodiment.
Valve opening pressure P of the solenoid 10_oTo the desired value P _ocProcess to set
Show. As shown in FIG.₀When setting
First, in step 200, the pressure of the air source 154
Is the valve opening pressure P_oDesired value P_ocP of lower pressure than_LSet to
Is done. Next, in step 202, the flow rate Q reaches zero.
Until the valve seat 40 is pressed. As described above
When the flow rate Q reaches zero, the valve opening pressure P_oIs the flow
It corresponds to the pressure of the air supplied to the body passage 42. Follow
And the pressure of the air source 154 is P _LAnd the flow rate Q
The valve seat 40 is press-fitted until the pressure reaches zero.
And the valve opening pressure P₀Is P_LIs set to

By the way, in the above step 200, air
The pressure of the source 154 is set to the valve opening pressure P from the beginning. _oDesired value P_ocLike
It is conceivable to set a new value. However, this
, The valve opening pressure P_oTo the desired value P_ocTo adjust accurately
At the time when the flow rate Q reaches zero in step 202,
It is necessary to stop the press-fitting of the valve seat 40 promptly.
Therefore, the press-fitting speed cannot be increased. this
On the other hand, in the present embodiment, first, in step 200,
At the desired pressure P_ocSmaller than
Na P_L, The flow rate Q in the step 202
The pressure of the valve seat 40 is slightly delayed from the point when the pressure reaches zero.
The valve opening pressure P_oIs the desired value P _ocExceed
Is prevented. Therefore, according to the present embodiment, the valve seat
Can increase the press-fit speed of the linear solenoid
The assembly of the id 10 can be performed quickly.

When step 202 is completed, step 20
In 4, the pressure of the air source 154 is increased until the pressure P _H in comparison with the desired value P _oc of valve opening pressure P _o. in this case,
The fluid passage 42 compared to the current value P _L of the valve opening pressure P _o that the high-pressure air is supplied, the valve assembly 70 is opened, comprising a valve assembly 70 as air flows. When step 204 is completed, next, in step 206, the pressure sensor 15
2 and 154, the air supply piping 150
A pressure difference ΔP = P ₁ −P ₂ between the pressure and the air discharge pipe 158 is detected.

When the step 206 is completed, the process proceeds to the step 20
8, the differential pressure ΔP is equal to the valve opening pressure P _oDesired value P_ocReached
It is determined whether or not it has been performed. As a result, ΔP becomes the valve opening pressure P_o
Desired value P_ocIf not, then step 210
, The valve seat 40 is press-fitted by a predetermined minute amount.
It is. On the other hand, in step 208, ΔP becomes P_ocReached
If so, the press fitting of the valve seat 40 is terminated.

As described above, according to the process shown in FIG.
ΔP until reaches the desired value P _oc of the valve opening pressure P _o, so that the valve seat 40 is press-fitted. As explained in the first embodiment, under circumstances where the high-pressure air is supplied than the valve opening pressure P _o in the fluid passage 42, the pressure difference ΔP between the fluid passage 42 and fluid passage 38 It is matched to the valve opening pressure P _o.
Therefore, according to this embodiment, the process of steps 206 to 210, as the valve opening pressure P _o is set to a desired value P _oc, it is possible to adjust the press-fitting of the valve seat 40.

As described above, according to this embodiment, step 20
6 and the press-fitting of the valve seat 40 in step 210 are alternately performed. For this reason,
When the differential pressure ΔP reaches the desired value _Poc , the valve seat 4
It is not necessary to stop the 0 press-in immediately. That is, according to the present embodiment, in addition to the effect of the assembling method of the first embodiment, the advantage that the stop responsiveness required for the pressing member 88 of the press-fitting machine 72 can be reduced can be obtained. .

[0062] In the present embodiment, until the differential pressure ΔP has reached the desired value P _oc, it is assumed that repeating the press-fitting of the press and the differential pressure P of the valve seat 40 alternately, not limited to this, the In the configuration of the second embodiment shown in FIG.
Until the pressure reaches zero, detection of the flow rate Q and the valve seat 4
The press-fitting of a small amount of 0 may be repeated. In the above embodiment, step 204 shown in FIG. 12 corresponds to the first step described in claims 1 and 2, step 206 corresponds to the third step described in claim 2, and steps 208 and 21
0 corresponds to the fourth step described in claim 2. In the first to third embodiments, the poppet 48 corresponds to the valve element according to claims 1 to 3.

Next, a method of assembling the linear solenoid 10 according to the fourth embodiment of the present invention will be described. FIG.
In this embodiment, in order to set the valve opening pressure P _O of the linear solenoid 10 to a desired value P _OC , the valve assembly 70 is pressed into the press fitting machine 248.
It is sectional drawing which shows the state set above. 13, the same components as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. In the assembling method of this embodiment, the valve assembly 70 is assumed to be temporarily press-fitted to such an extent that the valve seat 40 does not contact the poppet 48, that is, the valve seat 40 does not reach the reference position. I do.

As shown in FIG. 13, the press-fitting machine 248 is controlled by a press-fitting control device 250. The press-fit control device 250 is supplied from the control device 252 with a control signal indicating a time T during which the pressing member 88 should be driven downward. The press-fit control device 250 displaces the pressing member 88 downward at a constant speed V for a time T according to the control signal. Therefore, the pressing member 88 is driven downward by the displacement amount V · T proportional to T. Then, the valve seat 40 is press-fitted with a stroke equal to the displacement VT. Therefore, the press-fit amount x of the valve seat 40 can be controlled by changing the time T. Hereinafter, the time T is referred to as a “press-fit time T”.

The pressing member 88 is provided with a load cell 253. The press-fit control device 250 includes a load cell 253.
, The load acting on the pressing member 88 is detected based on the output signal, and when the load becomes excessive, the driving of the pressing member 88 is stopped. An air supply pipe 254 is connected to the air supply passage 84 of the sealed case 78. A pressure sensor 256 is provided in the air supply pipe 254. The pressure sensor 256 detects the pressure P inside the air supply pipe 254.
A signal corresponding to ₃ is supplied to the control device 252. Control device 252 detects pressure P ₃ based on a signal supplied from pressure sensor 256. The first air supply pipe 254
An electropneumatic regulator 260 communicates with the solenoid valve 258. The first solenoid valve 258 is a normally closed solenoid on-off valve that is opened when an ON signal is supplied from the control device 252. The electropneumatic regulator 260 outputs air into the air supply pipe 254 with the first solenoid valve 258 opened. Electropneumatic regulator 260, the pressure P _S of the air to be output can be continuously changed from atmospheric pressure to a predetermined pressure in response to a control signal supplied from the control unit 252.

In the air discharge passage 86 of the sealed case 78,
The air discharge pipe 262 is connected. Air discharge piping 2
At 62, a pressure sensor 264 is provided. The pressure sensor 264 supplies a signal corresponding to the pressure P ₄ inside the air discharge pipe 262 to the control device 252. Control device 25
2 detects the pressure P ₄ based on the signal supplied from the pressure sensor 264. A flow sensor 268 communicates with the air discharge pipe 262 via a second solenoid valve 266. Second
The electromagnetic valve 266 is a normally closed electromagnetic opening / closing valve that is opened when an ON signal is supplied from the control device 252.
In addition, the flow sensor 268 supplies an output signal corresponding to the flow rate Q _O of the air flowing through the air discharge pipe 262 to the control device 252. Control device 252 detects flow rate Q _O based on a signal supplied from flow rate sensor 268. The downstream side of the flow sensor 268 is open to the atmosphere.

In the configuration shown in FIG.
The valve 258 is opened and the electromagnetic on-off valve 266 is closed.
The air output from the electropneumatic regulator 260
Pressure P_SWhen air pressure is continuously increased from atmospheric pressure, air supply
Pressure P in supply pipe 254_ThreeIs the pressure P_SRise with.
On the other hand, the pressure P in the air discharge pipe 262_FourIs the pressure P_ThreeBut
Valve opening pressure P of the linear solenoid 10_OUntil the atmosphere reaches
Held in pressure. And the pressure P_ThreeIs the valve opening pressure P_OTo
Upon reaching, the poppet 48 separates from the valve seat 46 and the poppet
Air supply piping through the gap between
Air is supplied from the 254 side to the air discharge pipe 262 side
As a result, the pressure P in the air discharge pipe 262 is _FourIs rising
You. Therefore, the pressure P_FourAt the time when the pressure rises
_ThreeIs the valve opening pressure P of the linear solenoid 10_OMatches.
Therefore, according to the configuration shown in FIG.
Opens the first solenoid valve 258 and sets the second solenoid valve
With the valve closed, the electropneumatic regulator 260 outputs
Air pressure P_SWhile increasing pressure P_ThreeAnd P_FourSupervise
The valve opening pressure P of the linear solenoid 10_O
Can be measured.

As described above, the valve opening pressure P _O of the linear solenoid 10 is obtained by dividing the load F _S acting between the poppet 48 and the valve seat 46 by the urging force of the spring 32 by the pressure receiving area S. be equivalent to. Here, the spring 32
Is equal to the press-fit amount x of the valve seat 40 from the reference position, and if the spring constant of the spring 32 is k, the load F _S is equal to k · x. Accordingly, valve opening pressure P _O and press-fitting amount x from the reference position of the valve seat 40
And the relationship of equation (1) is established.

P ₀ = (k / S) · x (1) FIG. 14 shows the relationship between the press-fit amount x of the valve seat 40 and the valve opening pressure P _O. As shown in FIG. 14, the press-fit amount x and the valve opening pressure P
The relationship with _O is linear with a gradient of Δ = (k / S). Thus, the valve seat 40, when the valve opening pressure P _O at a press fitting position is P _A, the press-fitting amount x _AB of the valve seat necessary to increase the valve opening pressure P _O to P _B,
It is determined by equation (2).

X _AB = (P _B −P _A ) / (k / S) = (P _B −P _A ) / Δ (2) However, as described above, the poppet 4 is provided in the pressure receiving area S.
8 and the shape of the valve seat 46 have variations. The spring coefficient k of the spring 32 also varies depending on the individual difference of the spring 32. Due to these variations, the value of Δ (= k / S) changes with each linear solenoid 10. Therefore, under the assumption that the Δ is constant, than to determine the press-fitting of the valve seat 40, is set to a desired value P _OC the valve opening pressure P _O at high accuracy based on equation (2) It is difficult.

On the other hand, in the assembling method of the present embodiment, the value of the valve opening pressure P _O at two points in the process of press-fitting the valve seat 40 and the value of the valve seat 40 between these points
Based on the press-fitting amount, by determining the final press-fitting amount for setting the valve opening pressure P _O to the desired value P _OC, with high accuracy settings valve opening pressure P _O, and obtained quickly performed It is characterized by points.

That is, in the present embodiment, the press-fitting of the valve seat 40 is performed by the first, second and third three-stage press-fitting steps. Then, the valve opening pressure P _O1 at the time when the first press-in step is completed and the valve opening pressure P _O2 at the time when the second step is completed are measured. When the press-fitting amount of the second press-fitting step and x _2, the gradient of the valve opening pressure P _O delta for press-fitting amount x is expressed by equation (3).

Δ = (PO ₂ −PO ₁ ) / x ₂ (3) Based on the gradient Δ, the press-fit amount x ₃ in the third step is determined according to the equation (4). x ₃ = (P _OC −P _O1 ) / Δ−x ₂ (4) where (P _OC −P _O1 ) / Δ is the valve opening pressure P _O from P _O1 to P
A press-fit amount of the valve seat 40 required to raise the _OC, by reducing the press-fitting amount x ₂ in this value the second press-fitting step, that is press-fitted amount x ₃ in the third stuffing step is determined Become. However, as described above, in the present embodiment, the press-fit amount x of the valve seat 40 is controlled based on the press-fit time T, and the press-fit times T of the valve seat 40 in the second and third press-fitting steps are respectively T ₂ , When T _3, the _{x 2 = V · T 2,} x 3 = V · T 3. Therefore, from the above equations (3) and (4), T ₃ = (P _OC −P _O1 ) / (Δ · V) −T ₂ = (P _OC −P _O1 ) · T ₂ / (P _O2 −P _O1) ) −T ₂ (5) is derived. Then, in the third press-fitting step, (5)
The valve seat 40 for the press-in time T ₃ determined by the equation
There it is pressed, the valve opening pressure P _O is set to the desired value P _OC.

Hereinafter, the specific processing contents in this embodiment will be described with reference to FIGS. FIG.
FIGS. 5 and 16 show a process of setting the valve opening pressure P _O of the linear solenoid 10 to a desired value P _OC in this embodiment.
Further, FIG. 17, in the process of the step shown in FIG. 15 and FIG. 16 is executed, the pressure P ₃ of the air supply pipe 254, the pressure P ₄ and the air discharge pipe 262, the press-fitting state of the valve seat 40 The time change is illustrated.

The steps shown in FIG. 15 and FIG.
252 is a pressure sensor 256, 264 and a flow sensor 26
8 while monitoring the output signal of the press-fitting control device 250, the first
Solenoid valve 258, second solenoid valve 266, and electropneumatic regulation
It is executed by giving a required signal to the
It is. When the steps shown in FIGS. 15 and 16 are started,
First, in step 300 shown in FIG.
The valve 258 and the second solenoid valve 266 are both opened.
You. Next, in step 302, the electropneumatic regulator 26
0, the valve opening pressure P_ODesired value P_OCSufficiently lower than
Predetermined pressure P_CIs supplied to the air supply pipe 254.
Next, in step 304, the air discharge pipe 262 is circulated.
Of flowing air Q _ODecreases to a predetermined value Q_CUntil it reaches
Then, the valve seat 40 is press-fitted (period shown in FIG. 17).
I). In this case, the response delay of the output of the flow sensor 268, etc.
Flow rate Q_OIs the predetermined value Q_CBal
Even if the press-fitting of the seat 40 is stopped, the valve seat 40
Pressed in beyond the reference position. That is, step 30
At the end of step 4, the poppet 48 and the valve seat 46 come into contact.
However, the spring 32 is contracted and deformed to some extent. this
Step 304 corresponds to the first press-fitting step described above. However
However, the first press-fitting step is not limited to the above-described step, and the valve opening pressure P
_OIs the desired value P_OCWithin a range that is sufficiently small compared to
The valve seat 40 is pressed over the reference position.
I just need.

When the step 304 is completed, the subsequent step 306
, The first on-off valve 258 is maintained in the open state.
Also, the second solenoid valve 266 is closed and the electro-pneumatic regulation is performed.
Pressure P of air output from_SUp to atmospheric pressure
Is reduced. Then, in step 308, the pressure P
_SIs continuously raised from the atmospheric pressure, and the air discharge piping 262
Pressure P_FourIs the predetermined value P_TH(When the time shown in FIG. 17)
A), pressure P of air supply pipe 254 at that time_ThreeIs detected
And the boost of the electropneumatic regulator 260 stops.
Pressure P_SIs returned to atmospheric pressure. Where the predetermined value
P_THIs the pressure P _FourTo judge that has started
This is a threshold value and is set to a sufficiently small value. Therefore, when
Pressure P at point A_ThreeDetecting step 304
(Ie, the first press-fitting step)
Valve opening pressure P of solenoid 10₀₁Will be measured. Engineering
When the step 308 is completed, next, in step 310,
When the two solenoid valves 266 are opened, the press-fitting machine 248
The air staying inside is exhausted.

When step 310 is completed, step 31
In 2, the press-in time T2 in the _second press-in step is (6)
It is calculated according to the formula. However, in equation (6), P
_O2C is a target value of the valve opening pressure P _O in the second press-in step, and is set to an intermediate value between P _O1 and a desired value P _OC . Δ ₀ is a standard value of the gradient Δ (= S / k).

T_Two= (P_O2C−P_O1) / (Δ₀・ V) (6) When step 312 is completed, next, in step 314,
When the valve seat 40 is pressed for a time_TwoOnly being pressed
Then, the second press-fitting step is performed (period I shown in FIG. 17).
I). After the step 314 is completed, the process proceeds to a step 316.
And while the first solenoid valve 258 is kept open,
The solenoid valve 266 is closed. Then, in the following step 318
Of the air output from the electropneumatic regulator 260
Pressure P_SIs continuously raised from atmospheric pressure, and the air discharge piping
262 pressure P_FourIs the predetermined value P_TH(Fig. 17)
B), the pressure P of the air supply pipe 254 at that time
_ThreeIs the valve opening pressure P _o2Is measured as Valve opening pressure P_o2Is measured
The pressure of the electro-pneumatic regulator 260 stops immediately.
Stopped and returned to atmospheric pressure. And step 31
8 is completed, next, at step 320, the second electromagnetic
By opening the valve 266, the air in the press-fitting machine 248 is opened.
A is exhausted.

When the step 320 is completed, the press-fitting time T ₃ in the third press-fitting step is calculated according to the above equation (5) in a step 322 shown in FIG. Then, next, in step 324, the valve seat 40 is set to the time T _3.
The third press-fitting step is performed by only press-fitting (period III shown in FIG. 17). When step 324 is completed,
Next, in step 326, the second solenoid valve 266 is closed. Next, in step 328, the electropneumatic regulator 260
Is continuously increased from the atmospheric pressure, and the pressure P ₃ of the air supply pipe 254 at the time when the pressure P ₄ of the air discharge pipe 262 exceeds a predetermined value P _TH , that is, the linear solenoid 10 final opening pressure P _O of the measurement. Then, when step 328 is completed, step 3
In 30, the air in the press-machine 248 is evacuated by the second solenoid valve 266 is opened, the process for setting the valve opening pressure P _O is completed.

FIG. 18 shows several hundred linear solenoids 10.
Respect, as 2.4MPa the desired value P _OC of the valve opening pressure P _O, in the case of performing the setting of the opening pressure P _O by the steps shown in FIGS. 15 and 16, the distribution of the valve opening pressure P _O Is shown. As shown in the figure, the valve opening pressure P _O of the linear solenoid 10 is entirely within the standard range of 2.4 MPa ± 0.25 MPa.

For comparison, the press-fit amount x of the valve seat 40 was
The valve opening pressure when the valve opening pressure P _O is set by a three-stage press-in process in the same manner as in the present embodiment, on the assumption that the gradient Δ of the relationship between the pressure and the valve opening pressure P _O is constant. The distribution of _PO was examined.
Hereinafter, this step is referred to as a comparison step. FIG. 19 shows the pressure P in the air supply pipe 254 during the execution of the comparison step.
₃ , the pressure P ₄ in the air discharge pipe 262 and the time change of the press-fit state of the valve seat 40 are shown. Also, FIG.
Similar to FIG. 18, with respect to several hundred linear solenoid 10, as 2.4MPa the desired value P _OC of the valve opening pressure P _O, in the case of performing the setting of the opening pressure P _O in comparison step, open 3 shows the distribution of the valve pressure P _O.

As shown in FIG. 19, in the comparison step,
The valve seat 40 is press-fitted in a three-stage press-fitting process. Among them, the first and second press-fitting steps are performed in the same manner as the first and second press-fitting steps of the steps shown in FIGS. That is, in the first step, the air supply pipe 254 is used.
Air discharge pipe in a state in which air is supplied at a predetermined pressure P _C in 2
62 of the flow rate Q _O is performed by press-fitting the valve seat 40 to reach a predetermined value Q _C, also pressed time T ₂ in the second press-fitting step is determined according to equation (6). However, in the comparison step, when the valve opening pressures P _O1 and P _O2 at the time when the first and second press-in steps are completed, the electropneumatic regulator 260 is detected even after these valve opening pressures are detected. Increases the pressure P _{s of} the air output from the engine to a constant value. On the other hand, the press-in time T ₃ ′ in the third press-in stage
Is based on the assumption that the slope Δ matches the standard value Δ ₀ ,
Determined according to equation (7).

T ₃ ′ = (P _OC −P ₀₂ ) / (Δ ₀ · V) (7) As shown in FIG. 20, the valve opening pressure P set by the comparison process
_O is distributed over the range of the standard value of 2.4 ± 0.25 MPa, which indicates that it is difficult to set the valve opening pressure P _O with high accuracy. The main cause of such large variation is that the gradient Δ is caused by the pressure receiving area S and the spring 3.
It is considered that the press-fitting time T ₃ ′ was determined on the assumption that the gradient Δ was equal to the standard value Δ ₀ despite the fluctuation due to the variation of the spring constant k of 2.

[0084] In contrast, according to this embodiment, the valve opening pressure P _O2 at the time the first press-fitting step is completed, the valve opening pressure P _O2 at the time the second press-fitting step has been completed and, By determining the press-in time T3 in the _third press-in step based on the press-in time T2 in the _second press-in step, the individual linear solenoid 1
This means that the gradient Δ for 0 is accurately estimated.
That is, according to the assembling method of this embodiment, the variation of Δ based on the individual difference of the linear solenoid 10 is compensated, as a result, as shown in FIG. 18, the desired value P _oc the valve opening pressure P _O at high accuracy It is possible to set to.

In this embodiment, in the first press-fitting step,
Although it is necessary to press-fit the valve seat 40 while monitoring the flow rate Q _O , it is not necessary to set the valve opening pressure P _O1 with high accuracy at the time when the first press-fitting step is completed. The press-fitting of the sheet 40 can be performed at a relatively high speed. In the second and third steps, it is sufficient to press-fit the valve seat 40 for the press-fitting times T ₂ and T ₃ calculated in advance, and monitor the state quantities such as the pressures P ₃ and P ₄ and the air flow rate Q _0. It is not necessary to press-fit the valve seat 40 while doing so. Therefore, in the second and third press-fitting steps, the press-fitting of the valve seat 40 can be performed at a relatively high speed. As described above, according to the assembling method of the present embodiment, it is possible to adjust the valve opening pressure P _O with high accuracy while quickly press-fitting the valve seat 40. 10 can be shortened.

As described above, in the comparison step,
When measuring the valve opening pressure P _o2, P _o3, electro-pneumatic regulator 2
Because you are be increased to always constant value of pressure P _s of the air to 60 output, a relatively long adjustment time until the measurement of the final valve opening pressure P _O from the first press fitting process is started is completed whereas takes (time T _B shown in FIG. 19), in this embodiment, by stop an increase in pressure P _s at the time of valve opening pressure P _o2, P _o3 is detected, FIG. 17 T
_As shown by _A , the adjustment time of the valve opening pressure P _O is further reduced.

In the steps shown in FIGS. 15 and 16,
When measuring the valve opening pressure P _O, the pressure P _S of the air output by the electropneumatic regulator 260 it is assumed that increasing the atmospheric pressure, the valve opening pressure P at the time when the second and third step is completed
When measuring _O , the time for adjusting the valve opening pressure can be further reduced by starting the rise from a pressure higher than the atmospheric pressure. That is, since it is clear that the valve opening pressure P _O at the time when the second step is completed is higher than P _O1 , it is sufficient to start increasing pressure at least from P _O1 ,
Further, valve opening pressure P _O at the time the third step is completed P _O2
Clearly, it is sufficient to start increasing the pressure from at least P _O2 .

In the fourth embodiment, the valve seat 40 is press-fitted in the first to third three-stage press-fitting steps, and the valve opening pressure P at two points in the process.
Based on _O1, P _O2, it was decided to determine the press-fitting amount x ₃ in the final third of the press-fitting process. However, the present invention is not limited to this, and the valve seat 40
By measuring the valve opening pressure P _O at three or more points in the process of press-fitting and determining the final press-fitting amount of the valve seat 40 based on the measured values, the valve opening pressure P _O is further increased.
_O setting accuracy can be improved.

In the fourth embodiment, the poppet 48 corresponds to the valve element according to the fourth aspect, and the steps 304 and 314 correspond to the first step according to the fourth aspect.
08 and step 318 correspond to the second step described in claim 4, step 322 corresponds to the third step described in claim 4, and step 324 corresponds to the fourth step described in claim 4. and, also, the "adjustment amount-related value of the positional relationship" in the third step of press-fitting time T ₂ is set forth in claim 4, press-fitting time T ₃ is set forth in claim 4 "final adjustment amount Related values "respectively. However, if the press-fit amount of the valve seat 40 can be directly controlled, the press-fit amount of the valve seat 40 itself can be used as the “adjustment value related to the positional relationship”. Others
Any parameter corresponding to the press-fit amount of the valve seat 40 on a one-to-one basis can be used as the “position-related adjustment amount-related value”.

As described above, in the first to fourth embodiments, the valve seat 40 is fixed by press fitting.
The present invention is not limited to this, and can be applied to a case where the valve seat 40 is fixed by other fixing means such as screwing. Further, in the first to fourth embodiments, the case where the present invention is applied to the assembling of the linear solenoid 10 has been described. However, the present invention is not limited to this. The present invention can be applied to assembling of any relief valve having a valve element which is biased.

[0091]

As described above, according to the first aspect of the present invention, the positional relationship between the valve seat and the valve element can be adjusted based on the valve opening pressure. Therefore, according to the present invention, the valve opening pressure of the relief valve can be set to a desired value with high accuracy. According to the second aspect of the present invention, the valve opening pressure of the relief valve can be detected by applying a fluid pressure higher than the desired valve opening pressure in the valve opening direction of the relief valve. it can. Therefore, according to the present invention, the valve opening pressure can be set to a desired value with high accuracy without maintaining the fluid pressure applied to the relief valve at a desired valve opening pressure.

Further, according to the third aspect of the present invention, it is possible to detect whether or not the valve opening pressure has reached a desired valve opening pressure based on the flow rate of the fluid flowing through the relief valve.
Therefore, according to the present invention, the valve opening pressure can be set to a desired value with high accuracy while using the flow rate sensor instead of the pressure sensor. According to the fourth aspect of the invention, the final adjustment amount-related value of the positional relationship between the valve body and the valve seat is determined in consideration of the individual difference of the relief valve, and the final adjustment amount-related value is determined. The final adjustment of the positional relationship between the valve element and the valve seat can be performed based on the value. Therefore, according to the present invention, the final adjustment of the positional relationship between the valve seat and the valve element can be performed quickly and with high accuracy without monitoring the fluid pressure, the flow rate, and the like. Can be shortened.

[Brief description of the drawings]

FIG. 1 is a sectional view of a linear solenoid according to one embodiment of the present invention.

FIG. 2 is a diagram illustrating a state where a differential pressure ΔP acts on a poppet.

FIG. 3 is a diagram (part 1) illustrating a conventional method of setting a valve opening pressure.

FIG. 4 is a diagram (part 2) illustrating a conventional method of setting a valve opening pressure.

FIG. 5 is a diagram (part 3) illustrating a conventional method of setting a valve opening pressure.

FIG. 6 is a diagram (part 4) illustrating a conventional method of setting a valve opening pressure.

FIG. 7 is a cross-sectional view showing a state where the valve assembly is installed in the press-fitting machine in the present embodiment.

FIG. 8 is a diagram showing a relationship between _a press-fit amount x of a valve seat and a pressure Pa in an air supply pipe.

FIG. 9 is a sectional view showing a state where a valve assembly is installed in a press-fitting machine in a second embodiment of the present invention.

FIG. 10 is a diagram showing a relationship between a press-fit amount x of a valve seat and a flow rate Q of air flowing through an air discharge pipe.

FIG. 11 is a sectional view showing a state where a valve assembly is installed in a press-fitting machine in a third embodiment of the present invention.

FIG. 12 is a view showing a step of setting a valve opening pressure in the present embodiment.

FIG. 13 is a sectional view showing a state where a valve assembly is installed in a press-fitting machine in a fourth embodiment of the present invention.

FIG. 14 is a diagram showing a relationship between a press-fit amount x of a valve seat and a valve opening pressure P _O of a linear solenoid.

FIG. 15 is a diagram (part 1) illustrating a step of setting a valve opening pressure in the embodiment.

FIG. 16 is a diagram (part 2) illustrating a step of setting the valve opening pressure in the embodiment.

[17] In this example the pressure P ₃ in the air supply pipe in the pressure P ₄ of the air discharged in the pipe, and a diagram showing the time variation of the press-fitting state of the valve seat.

FIG. 18 is a diagram showing a distribution of the valve opening pressure of the relief valve set by the assembling method of the present embodiment.

[19] compared the pressure P of the air supply in the pipe in the step _3, the pressure P ₄ of the air discharged in the pipe, and a diagram showing the time variation of the press-fitting state of the valve seat.

FIG. 20 is a diagram showing the distribution of the valve opening pressure of the relief valve set in the comparison step.

[Explanation of symbols]

 Reference Signs List 10 linear solenoid 40 valve seat 46 valve seat 48 poppet 70 valve assembly 94, 152, 158, 256, 264 pressure sensor 98, 122, 154 air source 126 flow sensor 260 electropneumatic regulator

Claims (4)

[Claims] 1. A method of assembling a relief valve including a valve seat and a valve body biased toward the valve seat, wherein a predetermined fluid pressure is applied in a direction to open the relief valve. A first step of adjusting a positional relationship between the valve seat and the valve element based on a valve opening pressure of the relief valve. Method. 2. The method for assembling a relief valve according to claim 1, wherein the predetermined fluid pressure is higher than a desired valve opening pressure of the relief valve, and the second step includes: A third step of detecting a differential pressure between an upstream side and a downstream side of the relief valve; and a position of the valve seat and the valve body such that the differential pressure matches the desired valve opening pressure. And a fourth step of adjusting the relationship. 3. The method for assembling a relief valve according to claim 1, wherein the predetermined fluid pressure is equal to a desired valve opening pressure of the relief valve, and wherein the second step includes: A relief process comprising: a third step of detecting a flow rate of a flowing fluid; and a fourth step of adjusting a positional relationship between the valve seat and the valve element until the flow rate reaches zero. How to assemble the valve. 4. A method for assembling a relief valve including a valve seat and a valve body biased toward the valve seat, the method including temporarily adjusting a positional relationship between the valve seat and the valve body. A second step of measuring the valve opening pressure of the relief valve at at least two points in the first step; and a valve opening pressure at the at least two points and between the points. A third step of determining a final adjustment amount-related value of the positional relationship based on the adjustment amount-related value of the positional relationship; and determining the positional relationship based on the final adjustment amount-related value. And a fourth step of adjusting.