JP2001041342A - Solenoid valve and method for assembling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sharply reduce scattering of a force acting on a plunger by excitation of the coil by holding a core solenoid in a case without inclination. SOLUTION: This method is to connect a hollow core solenoid 12 held in a cylindrical case 4 of a solenoid portion 2 on a side of a sleeve 31 in a pressure-fit condition, and a spool 32 through a shaft 24 inserted through a hollow portion of the core solenoid 12. By excitation the coil 17, a plunger 20 moving along the same axis the core solenoid 12 is accommodated, and a caulking piece 9 of the case 4 is folded along a taper portion 16, thereby causing the core solenoid 12 to be fixed at a holding position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for driving a plunger by exciting a coil and displacing a spool accordingly.

[0002]

2. Description of the Related Art Generally, an automatic transmission or the like mounted on a vehicle is provided with an electromagnetic valve, and the hydraulic valve is supplied with hydraulic oil controlled at a predetermined pressure to be driven. I have. As this type of electromagnetic valve, an electromagnetic pressure adjusting valve 61 as disclosed in, for example, Japanese Patent Application Laid-Open No. 9-53742 is known.

As shown in FIG. 6, the electromagnetic pressure regulating valve 61 comprises a solenoid portion 62 and a valve portion 63 provided at one end of the solenoid portion 62. A case 64 of the solenoid portion 62 is formed in a bottomed cylindrical shape, and a cylindrical core solenoid 65 is provided in the case 64. The core solenoid 65 is provided with a flange 66 at the opening side of the case 64, and the outer periphery of the flange 66 is provided in contact with a step 67 formed inside the case 64. The inner diameter of the case 64 on the opening side of the stepped portion 67 is formed slightly smaller than the outer diameter of the flange portion 66, so that the core solenoid 6
5 is pressed into the case 64 at the flange portion 66.

In the case 64, a coil 68 is provided on the outer periphery of the cylindrical portion of the core solenoid 65.
The flange 68 of the coil 68 and the core solenoid 65
A filter 69 that prevents the coil 68 from rattling and that also has a sealing function is provided between them. The filter 69 is made of an elastic material, and the flange 66 of the core solenoid 65 is connected to the step 67 of the case 64.
Is provided in a state of being crushed in a state in which it is in contact with.

A shaft 71 is inserted into a hollow portion 70 of the core solenoid 65, and a plunger 72 is provided at a base end thereof, which is drawn toward the core solenoid 65 by excitation of the coil 68.

On the other hand, the valve portion 63 includes a sleeve 73,
And a spool 75 housed in a spool sliding hole 74 of the sleeve 73. The sleeve 73 is provided at one end with a flange 76 having substantially the same outer diameter as the flange 66 of the core solenoid 65. In a state where the flange portion 76 is in contact with the flange portion 66 of the core solenoid 65, the opening end of the case 64 is bent inward, whereby the flange portion 76 is swaged to the case 64 and the sleeve 73 is fixed. I have. The core solenoid 65, which has just been pressed into the case 64, is fixed in the case 64 by swaging the flange 76.

[0007] The spool 75 is connected to the shaft 71 so that one end thereof is coaxial with the shaft 71. The spool 75 is provided with a spring 7 provided on the other end side.
7 is always urged toward the solenoid portion 62 side.

Therefore, in the pressure regulating valve 61 having the above-described configuration, when the coil 68 is excited, the plunger 72 is drawn toward the core solenoid 65 by a force corresponding to the value of the current supplied to the coil 68. As the plunger 72 is driven, the shaft 71 and the spool 75 are displaced against the urging force of the spring 77. As a result, the flow path between the supply port 78 and the control port 79 and the flow path between the control port 79 and the discharge port 80 formed in the sleeve 73 is changed and controlled by the land 81 provided on the spool 75, and the control port The control pressure output from 79 is controlled.

At this time, the pressure adjusting valve 61 is
Of the land 81 by the passage 82 formed in the land 81
Is configured so that the control pressure acts on the spring 77-side end face of the spring.
The control pressure is controlled by the balance of the biasing force of the spring 77 and the force of the control pressure acting on the land 81.
Is controlled so as to have a pressure corresponding to the value of the current supplied to the power supply.

In the pressure regulating valve 61, a notch extending in the axial direction from an open end of the case 64 is provided in the case 64 of the solenoid 62 so as to provide a connector 83 for supplying a current to the coil 68. A portion 84 is formed. The cutout portion 84 is formed so as to extend toward the bottom surface of the case 64 beyond the stepped portion 67 with which the flange portion 66 of the core solenoid 65 contacts.

[0011]

However, as described above, the flange portion 66 of the core solenoid 65 has an outer diameter that is closer to the opening than the step portion 67.
The core solenoid 65 is press-fitted into the case 64 at the flange portion 66.
Then, the core solenoid 65 press-fitted into the case 64
Is not directly fixed by any means, but is merely fixed in the case 64 by caulking the flange portion 76 of the sleeve 73.

For this reason, an appropriate press-fitting margin is formed in the flange portion 66, and the core solenoid 65 is once press-fitted until the flange portion 66 abuts on the entire step portion 67 of the case 64, and the axial line with the plunger 71 is formed. May be maintained until the sleeve 73 is assembled. That is, before the sleeve 73 is swaged, the flange 66 rises from the step 67 and is inclined with respect to the axis. One possible cause is considered to be the restoring force of the filter 69, which is in a state of being crushed between the flange 66 and the coil 68 when the flange 66 is in contact with the step 67. When the notch 84 is formed in the case 64 as in the pressure regulating valve 61, the notch 84
It is also conceivable that the diameter of the case 64 is increased at the time of press-fitting due to the presence of.

In the caulking of the flange portion 76 of the sleeve 73,
Since no force is applied to the core solenoid 65 in the inclined state so as to bring the flange portion 66 into contact with the entire step 67 again, the core solenoid 65 is fixed in the case 64 in the inclined state. , The pressure regulating valve 61 is assembled.

The pressure regulating valve 61 having such a core solenoid 65 is disadvantageous in that the variation in the force acting on the plunger 72 by exciting the coil 68 increases. In addition, there is an inconvenience that hysteresis is increased due to misalignment between the core solenoid 65 and the plunger 72 or the shaft 71.

Therefore, as a countermeasure for solving such inconvenience, a flange 66 of the core solenoid 65 is provided.
Of the flange 66 so that the
It is not inconceivable to make the press-in allowance sufficiently large. However, if the press-fitting allowance is increased to that extent, the core solenoid 65 cannot be easily press-fitted, which hinders the assembling work. Further, when the notch 84 is formed in the case 64 as in the case of the pressure adjusting valve 61, the case 64 is further greatly deformed at the time of press-fitting. Therefore, it is not practical to increase the press fitting allowance of the flange portion 66.

The present invention has been made in view of such various circumstances, and greatly reduces the variation in the force acting on the plunger by exciting the coil by fixing the core solenoid in the case without tilting. One of the objectives is to reduce it.

[0017]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, a solenoid for displacing the valve body is provided at one end of a sleeve for housing the valve body. A valve, wherein the solenoid portion includes a hollow core solenoid held on the sleeve side in a state of being press-fitted into the cylindrical case, and a shaft inserted through the hollow portion of the core solenoid. And a plunger which is connected to the valve body and moves on the same axis as the core solenoid by exciting the coil, and the case is provided with a fixing portion for directly fixing the core solenoid at its holding position.

Therefore, according to the first aspect of the present invention,
The core solenoid held in the case in a press-fit state is directly fixed to the holding position by a fixing portion provided in the case. In other words, fixing the core solenoid to its holding position is performed directly, not as a secondary operation associated with fixing other members as in the related art. This prevents the core solenoid from being fixed in the case while being inclined with respect to its axis, so that the force acting on the plunger driving on the axis and the coaxial line by the excitation of the coil may vary. It is greatly reduced. Further, since there is almost no misalignment between the core solenoid and the plunger and the shaft, an increase in hysteresis is also prevented.

According to a second aspect of the present invention, in the solenoid valve according to the first aspect, the fixing portion is formed by caulking the case itself against the core solenoid. Therefore, according to the second aspect of the present invention, since the fixing portion is formed only by caulking the case itself against the core solenoid, the operation of fixing the core solenoid is easily performed.

According to a third aspect of the present invention, in the solenoid valve according to the first or second aspect, the core solenoid includes a cylindrical portion having at least a part inserted into an inner periphery of the coil;
A press-fit portion that is provided to protrude from the cylindrical portion toward the case side and is pressed into contact with the inner surface of the case, and a core solenoid is press-fitted into the case by the press-fit portion, and the fixed portion corresponds to the press-fit portion. It is provided in the place where it does.

Therefore, according to the third aspect of the present invention,
Since the core solenoid is fixed at a position corresponding to the press-fitting portion pressed into contact with the case, the fixing is reliably performed. For this reason, the core solenoid is further prevented from being fixed in the case in an inclined state, which contributes to reducing the variation in the force acting on the plunger due to the excitation of the coil and preventing the hysteresis from increasing.

According to a fourth aspect of the present invention, in the solenoid valve according to the third aspect, the sleeve side end of the case is in contact with the press-fit portion to regulate the movement of the core solenoid toward the plunger. The fixed portion is formed by bending the end of the case protruding from the press-fit portion in the restricted state obliquely toward the axis at a position where the case is pressed against the case of the press-fit portion.

Therefore, according to the invention described in claim 4,
The core solenoid is fixed by caulking by bending the end of the case obliquely toward the axis at the portion where the case is pressed against the case of the press-fitting portion, so that the portion corresponding to the outer peripheral surface of the press-fitting portion is recessed. The work of fixing the core solenoid is easier than the caulking.

According to a fifth aspect of the present invention, in the solenoid valve according to the fourth aspect, a tapered portion is formed on an outer edge portion of the press-fitting portion on the sleeve side to be inclined toward the inside of the case. The end of the case was bent along.

Therefore, according to the invention described in claim 5,
The outer edge of the press-fit portion of the core solenoid is pressed by the end of the bent case on the inclined surface of the tapered portion. The core solenoid is fixed to the holding position so that the core solenoid is pressed by the pressing force from the case. Therefore, the core solenoid is more securely fixed, and the core solenoid can be more reliably prevented from being fixed in the case in an inclined state.
As a result, the variation in the force acting on the plunger due to the excitation of the coil is reduced and the hysteresis is further prevented from increasing.

According to a sixth aspect of the present invention, in the solenoid valve according to any one of the first to fifth aspects, one end of the sleeve is brought into contact with the core solenoid, and in that state, the sleeve is more moved than the fixed portion. The sleeve was swaged by the end of the case on the side.

Therefore, according to the invention described in claim 6,
Since the sleeve is swaged by the end of the case closer to the sleeve than the fixing portion, the sleeve is fixed by the case. Therefore, there is no need to individually fix the sleeves, and the configuration of the device is simplified. Further, when the fixing portion is formed by caulking the case itself with respect to the core solenoid, not only the fixing of the core solenoid but also the fixing of the sleeve are performed by the case, so that the configuration of the device is further simplified.

According to a seventh aspect of the present invention, in the solenoid valve according to the sixth aspect, the sleeve is disposed within a range in which a sleeve-side end of the case projects from a contact surface on the core solenoid side. In addition, a flange is disposed inside the case from the outer edge of the press-fit portion of the core solenoid, and the flange is swaged by the end of the case.

Therefore, according to the invention of claim 7,
Since the end of the case is caulked to the flange of the sleeve, which is disposed inside the case from the outer edge of the press-fit portion of the core solenoid, the sleeve can be easily fixed. In addition, since the flange portion is disposed inside the case from the outer edge of the press-fit portion of the core solenoid, particularly when the fixing portion is formed by crimping the end portion of the case at a portion where the case is pressed against the case of the press-fit portion. , Making it easier to bend.

According to the present invention, the core is provided on the opening side of the case accommodating the coil and the plunger so as to be coaxial with the plunger and until it comes into contact with a regulating portion provided on the opening side of the case. An open end of the case is held in a state in which the solenoid is press-fitted to hold the core solenoid at a predetermined position in the case, and one end of a sleeve for accommodating a valve element is brought into contact with the press-fitted core solenoid. In the method of assembling an electromagnetic valve for caulking the sleeve, the core solenoid held in a predetermined position in the case is caulked by the open end of the case at the holding position, and thereafter, The sleeve is swaged by the opening end of the case which is closer to the opening side than the portion where the core solenoid is swaged.

Therefore, according to the invention described in claim 8,
After the core solenoid is swaged by the open end of the case and the core solenoid is fixed in the case, one end of the sleeve is in contact with the core solenoid, and the case which is closer to the opening side than the portion where the core solenoid is swaged. The sleeve is swaged by the open end of the sleeve. In other words, not only the core solenoid that is press-fitted and held in the case, but also a state in which one end of the sleeve is brought into contact with the core solenoid fixed in the case, and the flange of the sleeve is formed by the open end of the case. It is swaged. This prevents the sleeve from being assembled while the core solenoid is tilted with respect to the axis. Thereby,
Variations in the force acting on the plunger due to excitation of the coil are reduced, and an electromagnetic valve in which an increase in hysteresis is prevented can be obtained.

According to a ninth aspect of the present invention, in the method of assembling the solenoid valve according to the eighth aspect, the contact surface of the core solenoid with which the sleeve contacts is substantially the same shape as the inner surface of the case and slightly. The sleeve is formed to have a large diameter, and is arranged between the contact surface of the core solenoid with which the sleeve abuts and the open end of the case, and is disposed inside the outer periphery of the contact surface. The core solenoid is swaged at the outer periphery of the core solenoid by bending the open end of the case toward the inside of the case, and the sleeve is swaged at the outer peripheral corner of the flange. In the method described above, the opening end of the case is bent.

Therefore, according to the ninth aspect of the present invention,
Since both the core solenoid and the sleeve are caulked by bending the open end of the case, the core solenoid and the sleeve are easily fixed, and the assembling work of the solenoid valve is easily performed.

[0034]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
It will be described according to. As shown in the side sectional view of FIG. 1, the solenoid valve 1 of the present embodiment includes a solenoid portion 2 and a valve portion 3 provided at one end of the solenoid portion 2. In the following description of the solenoid valve 1, the solenoid portion 2 is referred to as a base end, and the valve portion 3 is referred to as a distal end.

The case 4 of the solenoid unit 2 is
Is formed in a cylindrical shape from a magnetic material (for example, a metal such as iron), which has a property that a restoring force after bending when bent at a predetermined location is extremely small. An inner cylinder 5 is provided coaxially on the base end side of the case 4, and is connected to the inner cylinder 5 at the base end side to form a housing space 6 with the inner cylinder 5. A disk-shaped cap 7 is provided at the base end of the case 4.
Is fixed, and the base end side of the case 4 is covered with the cap 7. Therefore, the case 4 is formed in a cylindrical shape with a bottom as a whole, and it can be said that the distal end side is the opening side of the case 4 and the base end side is the bottom side of the case 4.

A step 8 as a regulating portion is formed on the entire inner surface of the front end of the case 4. Step 8 is case 4
Is formed so as to extend from the inner surface to the outer surface by the same amount over the entire inner circumference, and the tip end side of the stepped portion 8 is a caulking piece 9. As shown in FIG. 2, the case 4 has a notch 1 extending from the distal end to the proximal end side of the step 8 along the axial direction thereof.
0 is formed.

At the front end of the case 4, a cylindrical core solenoid 12 is provided with the core solenoid 12 and its hollow portion 1.
3 is provided so as to be coaxial with the case 4. The core solenoid 12 has a cylindrical portion 12 a inserted into the inner periphery of the coil 17, and a press-fit portion provided at the distal end side of the cylindrical portion 12 a and having a circular cross section substantially the same shape as the inner surface of the case 4. The outer peripheral portion of the flange portion 14 is in contact with the step portion 8 over substantially the entire periphery except for the portion where the cutout portion 10 is formed. The front end face of the flange portion 14 and the core solenoid 12
Is formed flush with the end surface on the front end side, and forms one end surface 15. The outer diameter of the flange portion 14 is slightly larger than the inner diameter of the caulking piece 9, and the core solenoid 12 is provided in the flange portion 14 in a state of being pressed into the case 4. Therefore, when the core solenoid 12 is pressed into the case 4, the position at which the flange portion 14 abuts on the entire step 8 is the case 4.
And the holding position.

The flange portion 1 of the core solenoid 12
The tapered portion 16 is formed in the outer peripheral portion of the tip 4 on the distal end side and is inclined inward of the case 4, and the caulking piece 9 is bent inward along the inclination of the tapered portion 16 (in addition,
In FIG. 2, the tapered portion 16 is shaded and described).
For this reason, the outer peripheral portion of the flange portion 14 is pressed by the bent caulking piece 9 on the inclined surface of the tapered portion 16. With this pressing force, the flange portion 14 of the core solenoid 12 held in the case 4 is pressed by the caulking piece 9, whereby the core solenoid 12
Is fixed in the holding position. As shown in FIG. 3C, the inclination angle of the tapered portion 16 with respect to the axial direction is 30.
゜ is preferred.

Therefore, in this embodiment, the swaging piece 9
Is the end of the case (sleeve side) bent toward the axis of the case. In addition, a fixed portion is formed by bending the caulking piece 9 along the tapered portion 16. That is, a fixed portion is formed by a portion of the caulking piece 9 bent along the tapered portion 16.

In the case 4, the core solenoid 12
A coil 17 is provided on the outer periphery of the housing and the accommodation space 6. Therefore, the core solenoid 12
Are arranged in a state where they are inserted. Coil 17
A filter 18 that prevents the coil 17 from rattling and also has a sealing function is provided between the filter 18 and the flange portion 14 of the core solenoid 12. This filter 18
Is made of an elastic material, and is provided in a crushed state. As shown in FIG. 2, a wire for supplying a current to the coil 17 is led out of the coil 17 through the notch 10, and a connector 19 for connecting the wire to an external device is provided. It is provided outside the case 4 at a location corresponding to the notch 10.

On the other hand, on the base end side of the core solenoid 12,
A columnar plunger 20 is provided. The plunger 20 is inserted through the inner cylinder 5 with a slight gap, and is movable in the axial direction. Then, based on the excitation of the coil 17, the attractive force generated in the yoke 21 provided at the base end of the core solenoid 12 causes the plunger 2
0, the plunger 20 is drawn to the core solenoid 12 side.

A projection 22 is formed at the center of the base end of the plunger 20, and the projection 22 is attached to a disk-shaped disk spring 23 fixed to one end of the case 4 together with the cap 7. Installed. A fitting hole is formed at the center of the disc spring 23, and the protrusion 22 is inserted and attached to the fitting hole.
Thereby, the plunger 20 is supported.

In the hollow portion 13 of the core solenoid 12, shafts 24 protruding from both ends of the core solenoid 12 are provided.
It is inserted so as to be coaxial with the core solenoid 12. The base end of the shaft 24 is inserted into a mounting recess 25 formed in the plunger 20 so that the plunger 2
Connected to 0. A bearing bush 26 is provided in the core solenoid 12, and the shaft 24 is supported by the bearing bush 24. Therefore, both ends of the shaft 24 and the plunger 20 which are integrally formed are supported by the core solenoid 12 and the case 4.

The shaft 24 is provided with a stopper 27 which contacts the core solenoid 12 and restricts the movement of the plunger 20 toward the core solenoid 12. The movement of the plunger 20 toward the cap 7 is regulated by the contact of the plunger 20 with the cap 7.
Accordingly, the plunger 20 and the shaft 24 are located at a position where the plunger 20 abuts on the cap 7 (left side of the center line indicated by a dashed line in FIG. 1) and at a position where the stopper 27 abuts on the core solenoid 12 (right side thereof). , And is movable in the axial direction.

On the other hand, the valve portion 3 has a cylindrical sleeve 31.
And a spool 32 as a valve housed in the sleeve 31. The proximal end surface of the sleeve 31 is in contact with one end surface 15 of the core solenoid 12. Therefore, one end surface 15 of the core solenoid 1
It has two contact surfaces. The sleeve 31 is provided with a circular flange portion 33 disposed between the one end surface 15 and the tip of the caulking piece 9. The collar 33 is a sleeve 31
Is provided at the base end. Core solenoid 1 for collar 33
On the second side, an inclined surface 33a is formed from the end surface of the sleeve 31, and the flange 33 is formed so as to become thinner toward the outer peripheral portion by the inclined surface 33a. Furthermore, the collar 3
The outer diameter of the flange 3 is formed smaller than the outer diameter of the flange 14 of the core solenoid 12, and is disposed inside the case 4 from the outer periphery of the flange 14. Specifically, the proximal end surface of the sleeve 31 is the one end surface 1 of the core solenoid 12.
5, when the caulking piece 9 is bent inward along the slope of the tapered portion 16 formed on the flange portion 14 of the core solenoid 12, the caulking piece 9 is 31 is a diameter that comes into contact with the outer peripheral corner portion 34 at the tip end side. And the outer peripheral corner 3 of the flange 33
4, the caulking piece 9 is further bent inward, and the
3 is swaged. Thereby, the sleeve 31
However, the end face on the base end side is the one end face 1 of the core solenoid 12.
5 and is fixed. In addition, as shown in FIG. 3C, it is preferable that the inclination angle with respect to the axial direction after bending the caulking piece 9 at the outer peripheral corner 34 is 45 °.

The sleeve 31 has a first sliding hole 35, a second sliding hole 36, and a spring receiving hole 37 whose diameter gradually increases in order from the base end. These holes 35 to 37 are provided in the case 4 and the core solenoid 12.
And, it is formed so as to extend coaxially with the plunger 20.

The sleeve 31 corresponding to the boundary between the first sliding hole 35 and the second sliding hole 36 has an annular groove 3.
A feedback port (not shown) communicating with the annular groove 38 is formed in the sleeve 31. The supply port 39, the output port 40, and the discharge port 41 are formed in the sleeve 31 corresponding to the second sliding hole 36 in order from the base end side. The sleeve 31 corresponding to the boundary between the second sliding hole 36 and the spring housing hole 37 includes:
A drain port 42 for discharging the drain from the spring receiving hole 37 is formed. The plug 4 is screwed into a thread groove 43 formed in the inner peripheral surface of the spring receiving hole 37.
4 are provided.

Note that the output pressure of the output port 40 is
A feedback channel (not shown) is formed in the sleeve 31 for feeding back into the inside 8. The spool 32 is formed so as to extend coaxially with the shaft 24, and has a proximal end connected to a distal end of the shaft 24. That is, the spool 32 is connected to the plunger 20 via the shaft 24. A spring 45 is provided at the distal end of the spool 32 between the spool 32 and the plug 44, and the spool 32 is constantly urged toward the base end by the spring 45. Therefore, when the coil 17 is in the non-excited state, the spool 32, the shaft 24 and the plunger 20 are held in a state where the plunger 20 is in contact with the cap 7. Then, when the coil 17 is excited, the spool 32 moves to the distal end side as the shaft 24 and the plunger 20 move.

The spool 32 has a first land 46 corresponding to the first sliding hole 35, and a second land 47 and a third land 48 corresponding to the second sliding hole 36.
Are slidably provided in order from the base end side to the distal end side. The first land 46 and the second land 47 are provided such that the end faces facing each other face the inside of the annular groove 38. In addition, the second land 47 and the third land 47
The lands 48 are provided with end faces facing each other corresponding to the supply port 39 and the discharge port 41, respectively. When the coil 17 is in the non-excited state, a gap is formed between the edge of the second land 47 and the supply port 39, and the discharge port 41 is connected to the third land 4.
8 are closed. Then, as the coil 17 is energized and the spool 32 moves toward the distal end, the gap between the edge of the second land 47 and the supply port 39 decreases, and the gap between the edge of the third land 48 and the discharge port decreases. Port 41
Is formed between them. Thus, the spool 32
Of the second land 47 and the third land 4
8 and the supply port 39 and the discharge port 4
1 is appropriately changed, and the pressure output from the output port 40 between the two ports is controlled.

As described above, in the solenoid valve 1, the case 4, the core solenoid 12, the plunger 20, the shaft 24, the sleeve 31, the respective holes 35 to 37, the spool 32, etc. are all provided coaxially. An oil storage chamber 49 is formed on the base end side of the sleeve 31 by abutting the base end side surface of the sleeve 31 on the one end surface 15 of the core solenoid 12, and the hollow portion 1 of the core solenoid 12 is formed.
3. A space 50 formed around the plunger 20 and between the plunger 20 and the disc spring 23 is filled with hydraulic oil. Hydraulic oil flows through a notch (not shown) formed in the bearing bush 26 and a gap formed between the inner cylinder 5 and the plunger 20 to impart a damping action to the operation of the plunger 20.

Next, a part of a method of assembling the solenoid valve 1 will be briefly described. FIG. 3A shows a state in which the core solenoid 12 is press-fitted into the case 4, the outer peripheral portion of the flange portion 14 abuts on the entire step 8 of the case 4, and is held in the case 4 at this position. Is shown. The sleeve 31 has a base end surface facing the core solenoid 1.
The second surface is in contact with one end surface 15.

From this state, as shown in FIG.
The caulking piece 9 is bent inward of the case 4 along the inclination of the tapered portion 16 formed on the flange portion 14 of the core solenoid 12. Then, the caulking piece 9 comes into contact with the outer peripheral corner portion 34 of the flange portion 33 of the sleeve 31 on the distal end side of the sleeve 31. As a result, the core solenoid 12 that has only been held at the above-mentioned position in the case 4 is swaged by the swaging piece 9 and fixed in the case 4.
Therefore, it is possible to reliably prevent the flange portion 14 from rising from the step portion 8 and tilting. Therefore, Case 4,
The core solenoid 12 and the plunger 20 and the shaft 24 supported by these are arranged coaxially.

Thereafter, as shown in FIG. 3C, the caulking piece 9 is further bent inside the case 4 at the outer peripheral corner 34, and the flange 33 of the sleeve 31 is caulked to the case 4 by the caulking piece 9. I do. As a result, the sleeve 31 is fixed in a state in which its proximal end surface is in contact with the one end surface 15 of the core solenoid 12. In this way, the sleeve 31 is attached to the solenoid portion 2 in which the core solenoid 12, the coil, and the like are accommodated in the case 4.

In the solenoid valve 1 configured as described above, when hydraulic oil is supplied to the supply port 39 while the coil 17 is not excited, the hydraulic oil is supplied to the third land 48 of the second land 47. A gap formed between the opposing edges and the supply port 39 reaches the output port 40 via the second sliding hole 36 and is output from the output port 40.
At this time, the supplied hydraulic oil is output while its pressure is controlled to a control pressure corresponding to the gap.

When the coil 17 is excited, the plunger 20
Is drawn toward the core solenoid 12, and the spool 32 is displaced against the urging force of the spring 45.
As a result, the edge of the second land 47 and the supply port 3
9 gradually becomes smaller. Conversely, a gap is formed between the end of the third land 48 facing the second land 47 and the discharge port 41 that was initially closed by the third land 48, and the gap gradually increased. growing. For this reason, the control pressure of the output port 40 gradually decreases.

The control pressure of the output port 40 is introduced into the annular groove 38 via a feedback passage (not shown). Then, this control pressure acts on the end faces of the first land 46 and the second land 47 that face each other. Therefore, the thrust of the area difference between the first land 46 and the second land 47 acts on the spring 45.

That is, in this solenoid valve 1, the coil 17
To act on the plunger 20 acting according to the value of the current supplied to the coil (electromagnetic attraction acting on the core solenoid)
The control pressure is controlled by the balance between the biasing force of the spring 45 and the force of the feedback control pressure.
7 is controlled so as to have a pressure corresponding to the value of the current supplied to the switch 7.

Hereinafter, the characteristic operation and effect of the above embodiment will be described. (1) The core solenoid 12 held in the case 4 in a press-fitted state is bent along the tapered portion 16 of the caulking piece 9 so that the flange portion 1
4 is fixed at the position where it contacts. That is, fixing the core solenoid 12 at the position where the flange portion 14 is in contact with the entire step portion 8 is performed by using the sleeve 31 as in the related art.
Is performed directly, not as a secondary thing accompanying swaging to the collar portion 33.

This prevents the core solenoid 12 from being fixed in the case 4 in a state inclined with respect to its axis, so that the coil 17 is excited and the plunger 2
Variation in the force acting on zero can be greatly reduced. Further, the core solenoid 12, the plunger 20, and the shaft 24 generated by the inclination of the core solenoid 12
Is hardly generated, and an increase in hysteresis can be prevented.

(2) The core solenoid 12 is fixed at a position where the flange portion 14 is in contact with the entire step portion 8 only by caulking the case 4 itself against the core solenoid 12. The fixing work can be easily performed.

(3) Since the core solenoid 12 is fixed at a position corresponding to the flange portion 14 pressed against the case 4, the fixing is securely performed. For this reason, the core solenoid 12 is further prevented from being fixed in the case 4 in an inclined state, which contributes to reducing the variation in the force acting on the plunger 20 due to the excitation of the coil 17 and preventing the hysteresis from increasing. Can be.

(4) Since the core solenoid 12 is fixed by caulking the end of the case 4 obliquely toward the axis at the outer edge of the flange portion 14, the portion corresponding to the outer peripheral surface of the flange portion 14 is fixed. The work of fixing the core solenoid 12 can be easily performed as compared with caulking in which the portion is dented.

(5) Flange 1 of core solenoid 12
4 has an outer edge portion on an inclined surface of the tapered portion 16,
It is pressed by the bent end of the case 4. The core solenoid 12 is pressed by the pressing force from the case 4 so that
Is fixed at the position where it abuts. Therefore, the core solenoid 12 is more securely fixed, and the core solenoid 12 can be more reliably prevented from being fixed in the case in an inclined state. As a result, the variation in the force acting on the plunger 20 due to the excitation of the coil 17 is further reduced, and the increase in hysteresis is further prevented.

(6) The case 4 which is closer to the sleeve 31 than the portion bent along the tapered portion 16 of the caulking piece 9.
The sleeve 31 is fixed by the case 4 because the sleeve 31 is crimped by the end of the sleeve 31.
Therefore, it is not necessary to fix the sleeves 31 individually,
The configuration of the device can be simplified. Further, not only the fixing of the core solenoid 12 but also the fixing of the sleeve 31 are performed by the case 4, so that the configuration of the device can be further simplified.

(7) Flange 1 of core solenoid 12
Sleeve 31 arranged inside case 4 rather than outer edge 4
Since the end of the case 4 is caulked to the flange portion 33, the sleeve 31 is easily fixed.
Further, the flange portion 33 is a flange portion 14 of the core solenoid 12.
The case 4 is located inside the case 4 from the outer edge.
Can be easily bent.

(8) After fixing the core solenoid 12 in the case 4 by caulking the core solenoid 12 by the open end of the case 4, the sleeve 3 is attached to the core solenoid 12.
The sleeve 31 is swaged by the open end of the case 4 which is closer to the opening side than the swaged part of the core solenoid 12 in a state where one end of the sleeve 1 is in contact with the sleeve 31. That is, the end of the sleeve 31 is brought into contact with one end of the sleeve 31 against the core solenoid 12 fixed in the case 4, instead of the core solenoid 12 merely pressed and held in the case 4. The flange portion of the sleeve 31 is swaged by the portion. This prevents the sleeve 31 from being assembled while the core solenoid 12 is tilted with respect to the axis. Thus, it is possible to obtain an electromagnetic valve in which the variation in the force acting on the plunger 20 due to the excitation of the coil 17 is reduced, and the increase in hysteresis is prevented.

(9) Core solenoid 12 and sleeve 3
In either case, since the caulking is performed by bending the open end of the case 4, the core solenoid 12 and the sleeve 31 are easily fixed, and the assembling work of the solenoid valve can be easily performed.

The above embodiment can be modified, for example, as follows. As shown in FIG. 4, a configuration is adopted in which the caulking piece 9 is bent by bending the caulking piece 9 at the outer peripheral edge portion 51 of the flange portion 14 with respect to the core solenoid 12 in which the tapered portion 16 is not formed in the flange portion 14. You may. In this case, a fixed portion is formed by the bent portion of the caulking piece 9 at the outer peripheral edge portion 51 of the flange portion 14. Also with this configuration, since the core solenoid 12 is directly fixed at the position where the flange portion 14 is in contact with the entire step portion 8, the same operation and effect as in the above embodiment can be obtained. Can be.

As shown in FIG. 5, the flange 33 of the sleeve 31 is formed to have substantially the same outer diameter as the flange 14 of the core solenoid 12 in the same manner as before, and the outer periphery of the flange 14 of the case 4 is formed. The portion corresponding to the surface may be caulked so that the portion is depressed, so that the core solenoid 12 may be caulked. In this case, the fixing portion is formed by the concave portion 52 formed on the outer peripheral surface of the case 4. Also with this configuration, since the core solenoid 12 is directly fixed at the position where the entire stepped portion 8 and the flange portion 14 are in contact with each other, it is possible to obtain the same operation and effect as in the above embodiment. Can be.

Instead of fixing the core solenoid 12 held in the case 4 in the press-fitted state by caulking the flange portion 14 with the case 4, for example, the outer periphery of the core solenoid 12 or the flange portion 14 are fixed.
A screw hole is formed in the outer periphery of the case 4, a through hole corresponding to the screw hole is formed in the case 4, and the case 4 is fixed by using a screw or a bolt from outside the case 4. Is also good.

When the caulking piece 9 is bent along the inclination of the tapered portion 16, the flange portion 33 of the sleeve 31 is formed to have a diameter such that the caulking piece 9 abuts the outer peripheral corner portion 34. The diameter of 33 may be constant, and the inclined surface of the tapered portion 16 may be formed so as to contact the outer peripheral corner 34 of the flange 33.

The flange 33 of the sleeve 31 may be formed in a non-circular shape such as a polygonal shape instead of a circular cross-sectional shape. Instead of fixing the sleeve 31 by crimping the flange portion 33 with the caulking piece 9, for example, a screw hole is formed in one end surface 15 of the surface of the core solenoid 12, and the flange portion 33 has the same screw hole. Alternatively, a through-hole corresponding to the above-described method may be formed, and the through-hole may be fixed using a screw or a bolt.

The force due to the feedback control pressure does not act in opposition to the biasing force of the spring 45, but in opposition to the force that draws the plunger 20 that acts in accordance with the value of the current supplied to the coil 17. It may be configured to work. Also in this case, the control pressure is controlled to be a pressure corresponding to the value of the current supplied to the coil 17 by the balance of these three forces.

The inclined surface 33 a formed on the flange 33 of the sleeve 31 may be omitted, and the entire end surface of the flange 33 may be brought into contact with one end surface 15 of the core solenoid 12. -The inner cylinder 5 provided in the case 4 may be omitted. In that case, the shape of the plunger 20 is not columnar, but may be changed as appropriate, such as a shape adapted to the inner surface of the case 4.

The pressure controlled by the solenoid valve 1 may be not only mechanical oil such as hydraulic oil but also other fluids or gases such as air. Next, technical ideas other than the claims that can be grasped from the above embodiment will be described below together with their effects.

The solenoid valve according to claim 3, wherein the sleeve-side end surfaces of the cylindrical portion and the press-fit portion of the core solenoid are formed flush. The solenoid valve according to any one of claims 3 to 5, wherein the press-fitting portion has a flange portion which is substantially the same shape as the inner surface of the case and has a slightly larger diameter. According to this configuration, the fixing portion is formed over substantially the entire outer periphery of the case, so that the core solenoid can be fixed more reliably.

In claim 4, the case is formed in a cylindrical shape, and a notch extending along the axial direction of the case up to a coil provided along the inner surface of the case is formed at an end of the case on the sleeve side. A solenoid valve, wherein a portion is formed, and an end of the case is bent over substantially the entire circumferential direction of the case except for the cutout portion. According to this configuration, the end of the case excluding the notch is bent over the entire circumference to fix the core solenoid, so that the fixing can be performed more reliably.

According to a seventh aspect of the present invention, there is provided an electromagnetic device according to the seventh aspect, wherein the inclination of the tapered portion is formed so as to contact an outer peripheral corner of the flange portion of the sleeve when the end of the case is bent along the tapered portion. valve. According to this configuration, if the end of the case is further bent at the outer peripheral corner, the flange is swaged by the end of the case. Thereby, the sleeve is fixed with one end thereof in contact with the core solenoid. For this reason, the fixing of the sleeve is performed continuously immediately after the fixing of the core solenoid, so that the sleeve can be easily assembled.

The electromagnetic valve according to claim 7, wherein an inclined surface is formed from the end surface of the sleeve on the core solenoid side of the flange portion, and the flange portion is thinned toward the outer peripheral portion by the inclined surface. According to this configuration, the outer peripheral portion of the flange portion is separated from the contact surface on the core solenoid side. For this reason, when the caulking piece is bent at the outer peripheral corner of the flange and the flange is caulked, the flange is pressed toward the core solenoid with the base end side of the sleeve as a fulcrum, and the caulking of the flange is performed. Can be performed firmly.

The method of assembling an electromagnetic valve according to claim 8, wherein the case is formed with a cutout extending from the regulating portion to the bottom along the axial direction of the case.

[0081]

As described above in detail, according to the first to seventh aspects of the present invention, the core solenoid is prevented from being fixed in the case while being inclined with respect to the axis thereof. Variation in the force acting on the plunger driven on the axis and the coaxial line by the excitation of the coil can be greatly reduced. In addition, there is almost no misalignment between the core solenoid, the plunger and the shaft caused by the inclination of the core solenoid, so that an increase in hysteresis can be prevented.

In particular, according to the second aspect of the present invention, since the fixing portion is formed simply by caulking the case itself against the core solenoid, the operation of fixing the core solenoid is easily performed.

According to the third aspect of the present invention, since the core solenoid is fixed at a position corresponding to the press-fitting portion pressed against the case, the fixing can be surely performed. For this reason, it is further prevented that the core solenoid is fixed in the case in an inclined state, which contributes to the above effect.

According to the fourth aspect of the present invention, the core solenoid is fixed by caulking by bending the end of the case obliquely toward the axis at the portion of the press-fitting portion pressed against the case. The work of fixing the core solenoid can be easily performed as compared with caulking in which a portion corresponding to the outer peripheral surface is recessed.

According to the fifth aspect of the present invention, the core solenoid is fixed to the holding position by being pressed by the pressing force from the case, so that the core solenoid is more securely fixed. It is possible to more reliably prevent the core solenoid from being fixed in the case in an inclined state. As a result, the above effect is further contributed.

According to the sixth aspect of the invention, it is not necessary to fix the sleeves individually, and the configuration of the apparatus can be simplified. According to the invention as set forth in claim 7, since the collar of the sleeve disposed inside the case from the outer edge of the press-fit portion of the core solenoid is caulked by the end of the case, the sleeve can be easily fixed. Can be done.

According to the eighth and ninth aspects of the present invention, it is possible to prevent the sleeve from being assembled while the core solenoid is tilted with respect to the axis thereof, so that it acts on the plunger by exciting the coil. It is possible to obtain an electromagnetic valve in which the variation in force is reduced and the increase in hysteresis is also prevented.

According to the ninth aspect of the present invention, since both the core solenoid and the sleeve are caulked by bending the open end of the case, the core solenoid and the sleeve are easily fixed, and the electromagnetic valve is fixed. Can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a solenoid valve according to an embodiment;

FIG. 2 is a perspective view particularly showing a solenoid portion of the solenoid valve.

FIG. 3 is a sectional view of a main part showing a procedure for assembling the solenoid valve in the order of (a) to (c).

FIG. 4 is a sectional view of a main part showing a solenoid valve according to another embodiment.

FIG. 5 is a sectional view of a main part showing a solenoid valve according to another embodiment.

FIG. 6 is a side sectional view showing a conventionally known pressure regulating valve.

[Explanation of symbols]

2 ... solenoid part, 4 ... case, 8 ... step part as regulating part, 12 ... core solenoid, 12a ... tube part, 13 ... hollow part, 14 ... flange part as press-fit part, 17 ... coil,
20 ... plunger, 24 ... shaft, 31 ... sleeve,
32: spool as a valve element, 33: flange, 34: outer peripheral corner

Claims (9)

[Claims] An electromagnetic valve provided with a solenoid portion for displacing the valve body at one end of a sleeve for accommodating the valve body, wherein the solenoid portion is press-fitted into a cylindrical case thereof. In a state in which the core solenoid is held on the sleeve side and connected to the valve body via a shaft inserted through the hollow portion of the core solenoid, the core solenoid is moved on the same axis as the core solenoid by exciting the coil. An electromagnetic valve which accommodates a plunger to be fixed, and has a fixing portion for directly fixing the core solenoid at its holding position in the case. 2. The solenoid valve according to claim 1, wherein the fixed portion is formed by caulking the case itself against the core solenoid. 3. A core part, at least a part of which is inserted into the inner periphery of the coil, and a press-fit part which is provided to protrude from the cylindrical part toward the case and is pressed against the inner surface of the case. The solenoid valve according to claim 1, wherein the core solenoid is press-fitted into the case by the press-fit portion, and the fixed portion is provided at a location corresponding to the press-fit portion. 4. A case is provided at the end of the case on the sleeve side, which restricts the movement of the core solenoid toward the plunger by contacting the press-fit portion, and the case protrudes from the press-fit portion in the restricted state. The solenoid valve according to claim 3, wherein the end portion is bent obliquely toward the axis at a portion of the press-fitting portion that comes into pressure contact with the case to form the fixed portion. 5. The solenoid valve according to claim 4, wherein a tapered portion inclined toward the inside of the case is formed on the sleeve side of the outer edge of the press-fit portion, and the end of the case is bent along the tapered portion. . 6. The sleeve according to claim 1, wherein one end of the sleeve is brought into contact with the core solenoid, and in this state, the sleeve is swaged by an end of the case closer to the sleeve than the fixing portion. The solenoid valve according to the item. 7. The sleeve is disposed within a range in which a sleeve-side end of the case projects from a contact surface on a side of the core solenoid, and is located inside the case from an outer edge of a press-fit portion of the core solenoid. Provide a collar to be arranged,
7. The solenoid valve according to claim 6, wherein the flange is swaged by an end of the case. 8. A core solenoid is press-fitted into an opening side of a case accommodating a coil and a plunger so as to be coaxial with the plunger and until it comes into contact with a restricting portion provided on the opening side of the case. A solenoid is held at a predetermined position in the case, and the sleeve is swaged by the open end of the case in a state in which one end of a sleeve accommodating a valve element is brought into contact with the press-fitted core solenoid. In the method of assembling the solenoid valve, the core solenoid held in a predetermined position in the case is swaged by an opening end of the case at the holding position, and then the core solenoid is swung from a portion swaged by the core solenoid. A method of assembling a solenoid valve for caulking the sleeve by an opening end of the case on an opening side. 9. A contact surface of the core solenoid with which the sleeve abuts is formed in substantially the same shape as the inner surface of the case and has a slightly larger diameter, and the core solenoid with which the sleeve abuts is provided on the sleeve. A flange disposed between the abutment surface and the open end of the case, and disposed inside the outer periphery of the abutment surface. The caulking of the core solenoid is performed at the outer periphery of the core solenoid. 9. The solenoid valve according to claim 8, wherein the opening end of the case is bent toward the inside of the case, and the sleeve is crimped by bending the opening end of the case at the outer peripheral corner of the flange. Assembly method.