JP2002188747A - Solenoid valve and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a small size and a light weight of a solenoid valve for feeding and discharging a fluid pressure to a fluid pressure actuator of a transmission operation device for an automobile, etc. SOLUTION: A flange part 6b of a guide 6 is clamped by a solenoid 3 and a cover plate 9 and a cylinder part 6a of the guide 6 is inserted to a small diameter part 4a of a core 4. A projection part 6c formed by calking the outer periphery of the cylinder part 6a is engaged with an annular groove 4c formed on the outer periphery of the small diameter part 4a of the core 4 to fix the core 4 and the guide 6. A communication passage for connecting a feed hole with a discharge valve seat is formed in a plunger 5. Thereby, the dispersion of a gap between the plunger 5 and the core 4 is made smaller and a magnetic path of the plunger 5 and the cover plate 9 can be effectively formed. Thereby, a small size of a solenoid can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve mounted on an automobile or the like for supplying and discharging fluid pressure to a fluid pressure actuator or the like based on an electric signal. Used in a transmission operating device having a fluid pressure actuator that operates based on an electric signal,
The present invention relates to a solenoid valve for supplying and discharging fluid pressure to and from a fluid pressure actuator and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, particularly in large trucks and buses, a transmission operating device for performing a shift operation of a mechanical transmission using a fluid pressure actuator has become widespread. In a vehicle equipped with this type of transmission, when performing a shift operation, an electromagnetic valve is operated by an electric signal based on an operation of a change lever, and fluid pressure is supplied from a fluid pressure source to a fluid pressure actuator, and Is performed. Therefore, in this type of transmission operating device, the change lever only needs to be operated by a switch that generates an electric signal for operating the solenoid valve, and a large operating force for directly shifting the transmission as in a conventional transmission is required. No longer. This type of transmission operating device makes use of the power transmission efficiency, which is a feature of mechanical transmissions, to meet the needs of fuel savings, and enables gearshift operations to be performed by less powerful people and those with little driving experience. It has been adopted to meet the need for ease of use.

[0003] However, in this type of transmission operating device, a plurality of hydraulic actuators are required to perform a shifting operation.
A plurality of solenoid valves or the like for operating the same are required, and these must be mounted in a limited space around the transmission. Therefore, miniaturization of the solenoid valve is desired in order to improve the mountability to a vehicle. Also, due to the structure of the transmission operation device, the solenoid valve is attached to the end of the fluid pressure actuator. However, since the transmission operation device is directly attached to the transmission mounted on the vehicle integrally with the engine, When the weight of the solenoid valve is large, a large load is applied to the fluid pressure actuator due to the vibration, and it is desired to reduce the weight of the solenoid valve from the viewpoint of strength and durability. .

FIG. 4 is a cross-sectional view of a conventional solenoid valve which supplies and discharges fluid pressure from a fluid pressure source to a fluid actuator for operating a transmission operating device. A cylindrical case 2, a solenoid 3 housed inside the case 2, and a cylindrical guide 6 inserted into an inner peripheral portion of the solenoid 3, and a cylindrical portion inserted inside the guide 6 And a plunger 5 slidably inserted inside the guide 6, and a core 4 inside the guide 6.
A spring 13 mounted between the armature and the plunger 5,
The housing includes a cover plate 9 disposed in the case 2 radially outside the guide 6 so as to be in contact with the end face of the solenoid 3, and a housing 8 into which the end of the guide 6 on the side of the plunger insertion portion is inserted. Case 2
The two ends of the case 2 are caulked so that the solenoid 3 and the cover plate 9 are sandwiched between the flange of the core 4 and the flange of the housing 8. Therefore, the guide 6 is sandwiched between the flange of the core 4 and the bottom surface of the guide insertion hole of the housing 8.

[0005] An axial discharge hole 16 is formed in the center of the core 4, and the discharge hole 1 in the end face of the core 4 facing the plunger 5.
An annular discharge valve seat 21 is formed on the outer periphery of the opening 6. The plunger 5 has a cylindrical shape, and a discharge valve element 18 that can be seated on a discharge valve seat 21 and an introduction valve element 19 on the opposite side thereof are disposed in an inner diameter hole of the plunger via a spring. The discharge valve element 18 and the introduction valve element 19 are pressed outward in the axial direction by a spring disposed therebetween, and abut against ring members fixed to both ends of the inner diameter hole of the plunger 5. A plurality of passage grooves 17 are formed in the outer periphery of the plunger 5 in a plurality of axial directions. The housing 8 has an introduction hole 14 formed at the center of the bottom surface of the guide insertion hole and the opposite side opened at the side surface of the housing 8. The seat 20 is formed, and the introduction valve material 19 can be seated. The supply hole 1 opens at the bottom of the guide insertion hole outside the introduction valve seat 20 and opens at the other end of the housing 8.
5 are formed. The introduction valve body 19 and the introduction valve seat 20 constitute an introduction valve, and the discharge valve body 18 and the discharge valve seat 2
A discharge valve is constituted by 1. The introduction hole 14 is connected to a fluid pressure source (not shown), and the discharge hole 16 is open to the atmosphere. The supply hole 15 is connected to a fluid actuator (not shown).

When the solenoid valve 1 is not actuated, the plunger 5 is pressed downward in the figure by the urging force of the spring 13 so that the introduction valve body 19 is seated on the introduction valve seat 20 of the housing 8 and the discharge valve body. Reference numeral 18 is separated from the discharge valve seat 21 of the core 4. Therefore, the introduction valve is closed and the discharge valve is opened, and the fluid pressure from the fluid pressure source introduced into the introduction hole 14 is applied to the pressure chamber 12 in which the plunger 5 defined by the core 4, the guide 6 and the housing 8 is located. No fluid pressure has been introduced into the device. The pressure chamber 12 connected to a fluid pressure actuator (not shown) through the supply hole 15 is open to the atmosphere through a gap between the discharge valve body 18 and the discharge valve seat 21 and the discharge hole 16. The actuator is open to the atmosphere and does not operate.

The case 2, the core 4, the plunger 5 and the cover plate 9 are made of a magnetic material.
These form a magnetic path when a current is supplied to the solenoid 3 and excited. Then, the guide 6 and the housing 8
Is formed of a non-magnetic material so that the plunger 5 can move smoothly when the solenoid 3 is excited.

When a current is supplied to the solenoid 3 to excite it, the plunger 5 moves upward against the urging force of the spring 13 due to the exciting force, and the discharge valve is opened. The body 18 is seated on the discharge valve seat 21 to close the discharge valve, and the introduction valve body 19 is separated from the introduction valve seat 20 to open the introduction valve. From the pressure chamber 1
2, and the fluid pressure is supplied to a fluid pressure actuator (not shown) through the supply hole 15 to operate the fluid pressure actuator.

When the supply of current to the solenoid 3 is stopped from the operating state, the exciting force of the solenoid 3 is extinguished, the plunger 5 is moved downward by the urging force of the spring 13, and the introduction valve body 19 is moved to the introduction valve. The introduction valve is closed while sitting on the seat 20, and the discharge valve body 18 is separated from the discharge valve seat 21 to open the discharge valve. Then, the fluid pressure supplied to the fluid pressure actuator is changed to the supply hole 15 and the pressure chamber 1.
2. The fluid is discharged to the atmosphere through the passage groove 17 of the plunger 5, the gap between the discharge valve body 18 and the discharge valve seat 21, and the discharge hole 16, and the fluid pressure actuator returns to the non-operating state.

[00010]

By the way, in such a solenoid valve 1, when the solenoid 3 is excited,
The plunger 5 is attracted to the end face of the core 4 by the exciting force. At this time, in order for the plunger 5 to move upward against the urging force of the spring 13, the core 4 is
Must be greater than the biasing force of the spring 13. The urging force of the spring 13 causes the introduction valve body 19 to be seated on the introduction valve seat 20 against the acting force on the introduction valve body 19 due to the fluid pressure from the fluid pressure source supplied to the introduction hole 14 when not operating. The discharge valve 18 needs to be large enough to prevent the fluid pressure from leaking into the pressure chamber 12, and the discharge valve body 18 seated on the discharge valve seat 21 when the solenoid 3 is de-energized from the time of operation. It is necessary to have a size large enough to separate the seat 18 against the acting force of the fluid pressure acting on the body 18. However, in order to secure the supply / discharge speed of the fluid pressure to the fluid pressure actuator at the time of operation and return, the passage area of the introduction hole 14 and the discharge hole 16 needs to be a certain size. There is a limit to reducing the acting force of the fluid pressure acting on the bodies 18 and 19. Therefore, the urging force of the spring 13 needs to be set to a certain level, and the suction force for sucking the plunger 5 needs to be secured to a certain level.

One of the major factors influencing the magnitude of the suction force is a gap between the end face of the plunger 5 and the end face of the core 4. If the gap is small, a large suction force is generated. When the pressure increases, only a small suction force is generated. However, in the above-described conventional solenoid valve, the gap when not operating is related to the dimensions of many members such as the core 4, the case 2, the cover plate 9, the housing 8 and the plunger 5, so that the relative axial dimension of these members is large. The variation in the gap between the plunger 5 and the core 4 increases due to the variation in the distance. Therefore, in order to ensure the function of the solenoid valve, even if this gap has a maximum value within this large variation range, the suction force at that time must be larger than the biasing force of the spring 13. Therefore, it is necessary to secure the exciting force of the solenoid 3 by increasing the number of turns of the solenoid 3 and the like, and there is a problem that the size of the solenoid 3 is increased accordingly.

Another major factor affecting the magnitude of the attraction force is the formation of a magnetic path of the solenoid 3. If the magnetic path is formed effectively, the magnetic flux of the magnetic path increases and the attractive force of the plunger 5 increases, but if the magnetic path is not formed effectively, the magnetic flux decreases and the attractive force of the plunger 5 decreases. I will. In the above-mentioned conventional solenoid valve, the magnetic path is formed through the core 4, the case 2, the cover plate 9 and the plunger 5, but the magnetic path between the cover plate 9 and the plunger 5 is particularly problematic. Since the guide 6 made of a nonmagnetic material is interposed between the cover plate 9 and the plunger 5, a gap is generated between the cover plate 9 and the plunger 5. In addition, since the plurality of passage grooves 17 exist on the outer periphery of the plunger 5, the area of the magnetic path at that portion is reduced. Therefore, in the conventional solenoid valve, a magnetic path cannot be effectively formed between the cover plate 9 and the plunger 5, so that the exciting force of the solenoid 3 decreases and the attraction force of the plunger 5 decreases. Therefore, it is necessary to increase the number of turns of the solenoid 3 in order to make the attraction force of the plunger 5 larger than the urging force of the spring 13 as described above, and there is a problem that the solenoid 3 becomes large.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a solenoid valve capable of reducing the size of a solenoid and reducing the size and weight.

[00014]

In order to solve the above-mentioned problems, the invention of claim 1 comprises a solenoid housed in a case, a cylindrical guide inserted into the inner diameter of the solenoid, and a solenoid. One end is inserted into the guide, and a core having a discharge valve seat connected to a discharge passage for discharging fluid pressure on an end surface of the one end, and slidably inserted into the guide,
A discharge valve body that can be seated on the discharge valve seat at one end side, a plunger having an introduction valve body at the other end side, and an introduction valve seat that is connected to a fluid pressure source and can seat the introduction valve body of the plunger. In a solenoid valve having a housing having a supply passage for outputting a fluid pressure from the fluid pressure source and a cover plate provided between the housing and the solenoid and through which the plunger can penetrate, the guide comprises the core A cylindrical portion that can be inserted between the outer peripheral surface of the solenoid and the inner peripheral surface of the solenoid, and a flange formed at one end thereof. The flange is sandwiched between the solenoid and the cover plate. And an outer peripheral portion of the core and the cylindrical portion of the guide such that an axial distance from the surface of the cover plate opposite to the flange contact surface to the end surface of the core becomes a predetermined value. Fix It is characterized in that a stop means.

Further, according to the invention of claim 2, the locking means has an annular groove formed in an outer peripheral portion of the core and a convex portion formed in the cylindrical portion of the guide. The core and the guide are fixed by engaging a convex portion with the annular groove.

Further, the invention according to claim 3 is characterized in that a communication passage communicating between the supply passage provided in the housing and the discharge valve seat provided in the core is provided inside the plunger. And Further, according to the invention of claim 4, the discharge valve body is formed at one end side in the inner diameter hole of the plunger, and the valve member having the introduction valve body formed at the other end side is movably loosely inserted. The communication path is formed between an outer peripheral surface of the valve member and an inner peripheral surface of the inner diameter hole.

Further, the invention according to claim 5 provides a solenoid housed in a case, a cylindrical guide inserted into an inner diameter portion of the solenoid, an end face inserted into the guide, and an end face on one end side. A core having a discharge valve seat connected to a discharge passage for discharging fluid pressure, a discharge valve body slidably inserted into the guide, and capable of seating on the discharge valve seat at one end, and a discharge valve at the other end. A plunger having an introduction valve body, a housing having an introduction valve seat connected to a fluid pressure source, on which the introduction valve body of the plunger can be seated, and a supply passage for outputting fluid pressure from the fluid pressure source; And a solenoid provided with a cover plate through which the plunger can penetrate, wherein a cylindrical portion insertable into an outer peripheral portion of the core and a flange portion formed at one end thereof The outer peripheral portion of the core is inserted into the cylindrical portion of the guide having the guide plate, and the end surface of the core and the flange portion of the cover plate are brought into contact with the cover plate in contact with the end surface of the flange portion. Adjust the position of the core and the guide so that the axial distance between the contact surface and the surface on the opposite side is a predetermined value, and in that state, correspond to the annular groove formed in the outer peripheral portion of the core. The present invention is characterized in that a convex portion engaging with the annular groove is formed by plastically deforming the cylindrical portion of the guide to fix the core and the guide.

[00018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an example of an embodiment of a solenoid valve according to the present invention. The same components as those of the conventional solenoid valve shown in FIG. 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The solenoid valve 1 shown in FIG.
A solenoid 3 having a lead wire 3a extending to the outside is coaxially accommodated therein, and a core 4 having a small-diameter portion 4a and a large-diameter portion 4b is inserted into an inner peripheral portion of the solenoid 3. The cylindrical portion 6a of the guide 6 composed of the cylindrical portion 6a and the flange portion 6b is located between the outer peripheral surface of the small diameter portion 4a of the core 4 and the inner peripheral surface of the solenoid 3, and is located on the outer peripheral portion of the small diameter portion 4a of the core 4. A portion of the cylindrical portion 6a facing the formed annular groove 4c is plastically deformed by caulking or the like to form a convex portion 6c,
The core 4 and the guide 6 are integrated by engaging the convex portion 6c with the annular groove 4c. The annular groove 4c of the core 4 and the convex portion 6c of the cylindrical portion 6a of the guide 6 form the locking means of the present invention. Also, the small diameter portion 4 of the core 4
The airtightness is maintained by a seal member between a and the cylindrical portion 6 a of the guide 6, and the flange 6 b of the guide 6 is in contact with the lower end surface of the solenoid 3. The plunger 5 has a large-diameter portion 5a at the upper end, a small-diameter portion 5b at the center, and a large-diameter portion 5c at the lower end.
The large diameter portion 5a on the upper end side is slidably inserted into the inner diameter of the cylindrical portion 6a of the guide 6.
The guide plate 6 has a substantially disk-shaped cover plate 9 having a hole 9a.
Abuts against the lower end surface of the flange 6b of the
Is loosely fitted with a small gap. Airtightness is maintained between the cover plate 9 and the flange 6b of the guide 6 by a seal member. A large-diameter portion 5c at the lower end of the plunger 5 extends into a recess formed in the housing 8, and a large-diameter portion 5c at the lower end of the inner diameter of the stepped cylindrical second guide 7 disposed in the recess. Are slidably inserted. A spring 13 is elastically mounted between the lower end surface of the cover plate 9 and the step between the large diameter portion 5c and the small diameter portion 5b on the lower end side of the plunger 5 to urge the plunger 5 downward. The flange of the housing 8 is in contact with the lower end surface of the cover plate 9, and the cylindrical member 26 is inserted between the outer peripheral surface of the solenoid 3 and the inner peripheral surface of the case 2, and the cylindrical member 26 The lower end surface is in contact with the upper end surface of the flange 6b of the guide 6. The large-diameter portion 4b of the core 4 is fitted into the center hole of the upper cover 10, and the upper cover 10 is in contact with the upper end surface of the tubular member 26, and is formed in the lower end portion of the case 2 in the inner radial direction. The upper end of the case 2 is swaged in a state where the flange is in contact with the lower end surface of the flange of the housing 8 and the deformed portion is engaged with the upper cover 10 so that the electromagnetic valve 1
Has been assembled. Therefore, between the upper cover 10 and the flange of the housing 8, the cover plate 9, the core 4
The flange 6b of the guide 6 and the cylindrical member 26 integrated therewith are sandwiched.

Next, a method of fixing the core 4 and the guide 6 by caulking the cylindrical portion 6a of the guide 6 will be described with reference to FIGS. FIG. 2 shows a state before swaging, and FIG. 3 shows a state after swaging.
In FIG. 2, the cover plate 9 and the guide 6 are sequentially inserted into the cylindrical stepped jig 30 so that the cover plate 9 is in contact with the middle step surface 31, and the small diameter of the core 4 is provided in the cylindrical portion 6 a of the guide 6. The end portion of the small diameter portion 4a is in contact with the upper step surface 32 of the jig 30 when the portion 4a is inserted. This stepped jig 3
0 indicates that the axial distance between the middle step surface 31 and the upper step surface 32 is set to a predetermined dimension. In this state, the axial distance L between the lower surface of the cover plate 9 and the end face of the core 4 is set to the predetermined dimension. Has become. Next, the cover plate 9, the guide 6, and the core 4 are opposed to the annular groove 4 c formed in the small diameter portion 4 a of the core 4 from outside while holding the jig 30 so as not to move in the axial direction. The cylindrical portion 6a of the guide 6 is swaged to form a convex portion 6c that engages with the annular groove 4c. In the state after the caulking shown in FIG. 3, the convex portion 6 c formed by the caulking of the guide 6 is securely engaged with the annular groove 4 c of the core 4, so that the core 4 and the guide 6
In addition to being fixed integrally without play in the axial direction, the axial distance L from the lower surface of the cover plate 9 to the end surface of the guide 6 core 4 has a predetermined dimension. Thus, core 4
The annular groove 4c on the outer periphery of the small diameter portion 4a and the cylindrical portion 6a of the guide 6
The core 4 and the guide 6 are formed by a convex portion 6c formed by plastic deformation.
With this configuration, the axial distance L between the lower surface of the cover plate 9 and the end surface of the core 4 can be accurately and reliably set to a predetermined dimension. When the axial distance between the lower end surface of the flange 6 b of the guide 6 and the end surface of the core 4 is set to a predetermined dimension, the axial distance between the middle surface 31 and the upper surface 32 of the jig 30 is covered. What is necessary is just to make it short by the thickness dimension of the plate 9. With this configuration, the gap between the upper end surface of the plunger 5 and the end surface of the core 4 during non-operation, which is one of the major factors influencing the suction force of the plunger 5, is that the end surface of the core 4 and the cover plate 9 , The size of the contact surface of the housing 8 with the cover plate 9 and the introduction valve seat 20, and the size of the contact surface of the plunger 5 with the introduction valve seat 20 and the upper end surface. On the other hand, in the conventional solenoid valve, the gap is defined by the dimension between the end face of the core 4 and the upper end face of the case 2, the dimension between the upper end face and the lower end face of the case 2, the thickness dimension of the cover plate 9,
It is determined by the dimensions of the contact surface of the housing 8 with the cover plate 9 and the introduction valve seat 20, and the dimensions of the contact surface of the plunger 5 with the introduction valve seat 20 and the upper end surface. Therefore, in the present embodiment, as described above, the number of dimensions related to the gap is smaller than that of the conventional solenoid valve, so that the variation in the gap can be reduced as compared with the related art. As described above, when the variation in the gap becomes small, the gap between the end face of the core 4 and the end face of the plunger 5 must be considered in order to secure the attraction force of the plunger 5 that can reliably operate the solenoid valve. Since the maximum value can be reduced,
The solenoid 3 can be made smaller than a conventional solenoid.

Since the cover plate 9 is sandwiched between the flange 6b of the guide 6 and the housing 8, the wall surface of the hole 9a through which the plunger 5 of the cover plate 9 penetrates directly to the side surface of the plunger 5. Let me. Therefore, the guide 6 made of the non-magnetic material, which is interposed between the plunger 5 and the cover plate 9 in the conventional solenoid valve, does not intervene.
Since the wall surface of the hole 9a of the cover plate 9 can be directly brought close to the side surface of the plunger 5, the cover plate 9 which is another major factor affecting the suction force of the plunger 5 is provided.
Since the magnetic path between the plunger 5 and the plunger 5 can be effectively formed, the attraction force of the plunger 5 can be increased, and the solenoid 3 can be made smaller than the conventional solenoid.

The valve member 23 is inserted into the bore of the plunger 5.
Are movably inserted in the axial direction. The valve member 23 is formed by integrally forming a rubber member which connects both ends of the cylindrical member 24 through an inner diameter hole thereof to a cylindrical member 24 having a flange portion on one end side. A discharge valve element 18 is formed, and an introduction valve element 19 is formed at the lower end. A spring 25 is provided between the ring member fixed to the lower end of the inner diameter hole of the plunger 5 and the flange of the cylindrical member 24.
And the valve member 23 is urged upward to abut the upper end flange of the inner diameter hole of the plunger 5. A plurality of axial grooves are formed in the upper flange, and a space between the axial groove, the wall surface of the inner diameter hole of the plunger 5 and the outer peripheral surface of the valve member 23, and a plurality of grooves provided in the ring member. A communication path connecting the supply hole 15 provided in the housing 8 and the discharge valve seat 21 of the core 4 is formed by the through hole. Since the communication passage connecting the supply hole 15 of the housing 8 and the discharge valve seat 21 of the core 4 is formed inside the plunger 5 in this manner, it is not necessary to provide the passage groove 17 on the outer peripheral surface of the plunger 5, and the plunger 5 The area of the magnetic path between the cover and the cover plate 9 can be increased. As a result, the suction force of the plunger 5 can be increased, and the solenoid 3 can be made smaller than a conventional solenoid.

The upper end flange portion of the inner diameter hole of the plunger 5 may be formed separately from the plunger 5 and integrated by press fitting or the like. By doing so, the workability of the plunger 5 is improved. Alternatively, the upper end flange formed separately may be formed of a non-magnetic material, and the upper end flange may be in contact with the end surface of the core 4. In this way, when the solenoid 3 is de-energized from the state in which the plunger 5 made of a magnetic material is in contact with the core 4 made of a magnetic material, the attraction force between the plunger 5 and the core 4 is quickly reduced. As a result, return responsiveness is improved. The operation of this embodiment is the same as that of the above-described conventional example, and the description thereof is omitted.

[0024]

As described above, according to the present invention, the variation in the axial distance between the end face of the core and the lower end face of the cover plate can be reduced, and the magnetic path between the plunger and the cover plate can be effectively reduced. Can be formed. Therefore, it is possible to reduce the size of the solenoid of the solenoid valve, and it is possible to reduce the size and weight of the solenoid valve.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a solenoid valve according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state before caulking of a core and a guide according to the embodiment of the present invention.

FIG. 3 is a view showing a state after caulking of a core and a guide according to the embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a conventional solenoid valve.

[Explanation of symbols]

 2 Case 3 Solenoid 4 Core 4a Small Diameter 4c Annular Groove 5 Plunger 6 Guide 6a Cylindrical 6b Flange 6c Convex 8 Housing 9 Cover Plate 18 Discharge Valve 19 Introduction Valve 20 Introduction Valve Seat 21 Discharge Valve Seat 23 Valve Member

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[Procedure amendment]

[Submission date] December 22, 2000 (200.12.
22)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

Patent application title: Solenoid valve and method of manufacturing the same

Claims (5)

[Claims] 1. A solenoid housed in a case, a cylindrical guide inserted into an inner diameter portion of the solenoid, and a discharge that has one end inserted into the guide and discharges fluid pressure to an end face on one end. A core having a discharge valve seat connected to the passage, a discharge valve body slidably inserted into the guide, and capable of seating on the discharge valve seat at one end and an introduction valve body at the other end; A housing having an introduction valve seat connected to a fluid pressure source and capable of seating the introduction valve body of the plunger, and a supply passage for outputting fluid pressure from the fluid pressure source, between the housing and the solenoid; In the solenoid valve provided with a cover plate through which the plunger can penetrate, the guide is formed on a cylindrical portion that can be inserted between an outer peripheral surface of the core and an inner peripheral surface of the solenoid and one end thereof. And the flange portion is sandwiched between the solenoid and the cover plate, and a portion of the cover plate from the surface opposite to the flange contact surface with the end surface of the core. An electromagnetic valve provided with locking means for fixing an outer peripheral portion of the core and a cylindrical portion of the guide so that an axial distance becomes a predetermined value. 2. The locking means has an annular groove formed in an outer peripheral portion of the core and a convex portion formed in the cylindrical portion of the guide, and the convex portion is formed in the annular groove. The solenoid valve according to claim 1, wherein the core and the guide are fixed by engaging with the solenoid valve. 3. The plunger further includes a communication passage inside the plunger for communicating the supply passage provided in the housing and the discharge valve seat provided in the core. 3. The solenoid valve according to 2. 4. A valve member in which the discharge valve body is formed at one end side in the inner diameter hole of the plunger, and a valve member having the introduction valve body formed at the other end side is movably loosely inserted, and an outer periphery of the valve member. The solenoid valve according to claim 3, wherein the communication passage is formed between a surface and an inner peripheral surface of the inner diameter hole. 5. A solenoid housed in a case, a cylindrical guide inserted into an inner diameter portion of the solenoid, and a discharge having one end inserted into the guide and discharging fluid pressure to an end face on one end thereof. A core having a discharge valve seat connected to the passage, a discharge valve body slidably inserted into the guide, and capable of seating on the discharge valve seat at one end and an introduction valve body at the other end; A housing having an introduction valve seat connected to a fluid pressure source and capable of seating the introduction valve body of the plunger, and a supply passage for outputting fluid pressure from the fluid pressure source, between the housing and the solenoid; In the method for manufacturing an electromagnetic valve provided with a cover plate through which the plunger can penetrate, a front portion of the guide having a tubular portion that can be inserted into an outer peripheral portion of the core and a flange portion formed at one end thereof. The outer peripheral portion of the core is inserted into the cylindrical portion, and the end surface of the core and the flange contact surface of the cover plate are reversed in a state where the cover plate is in contact with the end surface of the flange. Adjust the position of the core and the guide so that the axial distance to the side surface is a predetermined value,
In this state, a convex portion that engages with the annular groove is formed by plastically deforming a portion of the cylindrical portion of the guide corresponding to the annular groove formed on the outer peripheral portion of the core. A method for manufacturing a solenoid valve, comprising fixing the guide.