JPH0334531Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to electromagnetic valves used in internal combustion engines, etc., and improves ease of manufacture and maintenance, particularly in terms of workability and assembly, and at the same time improves the valve opening and closing. It relates to products with improved accuracy, high-speed response, etc.

[Prior Art] FIG. 3 shows a conceptual diagram of an example of a solenoid valve. This electromagnetic valve has a stator core b, around which a solenoid a is wound, fixed to one end of a single housing. The axial center of the stator core b is hollow, into which one end of the shaft c is inserted so as to be movable in the axial direction. A moving core d is attached to the shaft c near the tip of the stator core b.
is fixed. A valve e is fixed to the tip of the other end of the shaft c, and a communication hole g formed in the case f can be opened and closed by moving the shaft c in the axial direction. Note that the shaft c is elastically supported by an adjustment spring h, a return spring i, and the like. When solenoid a is energized, the magnetic force generated at the tip of stator core b causes shaft c to
is attracted, and the shaft c moves upward in the figure against the adjustment spring h and the return spring i. As a result, the valve e opens and the communication hole g opens. When the energization to the solenoid a is stopped, the shaft c moves downward due to the elasticity of the adjustment spring h and the return spring i, and the valve e closes the communication hole g.

By the way, in the case of such a structure, it is necessary to form a hollow part for the shaft c in the stator core b, so that processing requires time and effort. Furthermore, it is necessary to incorporate a large number of small parts that are difficult to position, such as the coil spring i, solenoid a, and shaft c, into a single housing. Moreover, since a relatively long shaft c is required, it is important to improve assembly precision in order to accurately open and close the valve. Therefore, the assembly work becomes sophisticated, requires skill, takes a long time, and has poor workability. Furthermore, after assembly,
For example, when it is desired to repair an internal part such as solenoid a, the entire component must be disassembled, making maintenance difficult.

Further, the electromagnetic valve disclosed in Japanese Patent Application Laid-Open No. 57-1878 uses a pair of parallel cantilever leaf springs as the return springs, but the rest of the valve is constructed as shown in FIG. 3.

Furthermore, Utility Model Application No. 58-34582 and JP-A-60-
The electromagnetic valve shown in each publication of No. 60382 can be divided into an upper and lower part between a solenoid part and a valve part (described later) in order to improve maintainability and ease of assembly. However, in the former case, the shaft substantially passes through the stator core. The latter has a valve and a moving core at both ends of the shaft,
It also uses a coiled return spring. In addition, in order to reduce the pressure difference acting on the valve when the valve is opened and closed, the former is provided with an elastic pressure partition to define a communication chamber that communicates the shaft surroundings with the suction port and isolates it from the discharge port when the valve is closed. It is being This elastic pressure bulkhead consists of a bellows.

[Problems to be Solved by the Invention] By the way, in the device described in Japanese Utility Model Application Laid-Open No. 58-38582, the inertial mass becomes large because the shaft becomes long, and the high-speed response is reduced accordingly. In addition, two bearings (numerals 24 and 28 in the figure) are required in order to prevent horizontal vibration of the shaft in the axial direction and to improve centering accuracy. However, such a bearing is not advantageous because it requires a large number of man-hours to manufacture. In addition, although the center side of the bellows is tightly fitted around the shaft, the shaft in this area is not supported in the lateral direction, so it is possible that the lateral vibration of the shaft becomes large, and in this case, the bellows It becomes difficult to ensure airtightness between the shaft and the shaft.

In the structure described in Japanese Patent Application Laid-Open No. 60-60382, the shaft is shortened by the fact that a portion of the shaft is not passed through the stator core, so that the inertial mass can be reduced. However, on the other hand, since the return spring is only in the form of a coil, it is difficult to improve the accuracy of shaft centering, which lowers the opening and closing accuracy of the valve. (a sleeve-like member indicated by reference numeral 50) is required, which increases the number of manufacturing steps. Instead of the coil spring, it is possible to use the leaf spring described in the above-mentioned Japanese Patent Application Laid-Open No. 57-1878, but since the leaf spring is cantilevered in this way, the shaft cannot move linearly. First, it takes an arcuate trajectory in the left and right directions with respect to the axis. Therefore, it inherently includes a characteristic that the centering accuracy decreases. Further, since the leaf spring is connected to the shaft at both ends of the stator core, it becomes impossible to separate the valve portion and the solenoid portion as described above.

Therefore, the present invention not only improves manufacturability and maintenance, but also increases the high-speed response of valve opening/closing and improves centering accuracy to increase valve opening/closing accuracy.Furthermore, it maintains airtightness at the joint between the elastic pressure bulkhead and the shaft. With the goal.

[Means for Solving the Problems] The electromagnetic valve of the present invention has a solenoid part formed by fixing a stator core wrapped with a solenoid inside a case, and a valve part formed by inserting a valve mechanism into a housing. The solenoid part and the valve are formed separately, and the solenoid part and the valve are separably connected and integrated, and the valve mechanism has a valve at one end for opening and closing a communication path between the discharge port and the suction port provided in the housing. a shaft having a moving core disposed facing the tip of the stator core at the other end, and defining a communication chamber around the shaft that communicates with the suction port side and is isolated from the discharge port when the valve is closed. In a device equipped with an elastic pressure bulkhead, a pair of leaf springs are arranged at intervals in the axial direction of the shaft, each end of these leaf springs is fixed, and the shaft is supported at each central part. Accordingly, the shaft is supported on both sides so as to be movable in the axial direction by these pair of leaf springs, and the outer peripheral part of the elastic pressure bulkhead is supported by the fixing member arranged to fix each end between these leaf springs. ,
In addition, the center portion of the elastic pressure partition wall is tightly fitted and connected to the peripheral side of the shaft, and this joint portion is supported by the center portion side of one of the leaf springs.

[Operation of the invention] Since the solenoid part and the valve part are constructed separately, in order to assemble the electromagnetic valve, the valve mechanism is housed in the housing, the valve part is assembled, and then the solenoid part and the valve part are connected. death,
The two are separably integrated by appropriate means such as fastening. In addition, when repairing or replacing internal parts, the solenoid part and valve part are connected so that they can be separated, so if you separate the two at the connection part, the solenoid part, valve part, and valve mechanism can be separated. It is decomposed into Therefore, only the necessary parts are removed and repaired and replaced.

In the valve mechanism, one end of the shaft is lengthened and the shaft is shortened to the extent that it is not supported penetrating into the stator core, so the inertial mass is reduced and high-speed response is improved. Furthermore, since the shaft is supported on both sides by a pair of leaf springs spaced apart in the axial direction, lateral vibration during axial movement is reduced and centering accuracy is increased, resulting in high valve opening/closing accuracy. Become. In addition, since the joint between the central part of the elastic pressure bulkhead and the shaft side is supported by one of the leaf springs, lateral vibration of this joint is prevented, and as a result,
Airtightness at the joint is maintained.

[Example] An example of the present invention will be described based on FIGS. 1 and 2. Note that the vertical direction is based on the state of the drawing.

FIG. 1 shows a conceptual diagram, and this electromagnetic valve consists of a solenoid part A and a valve part B, which are each constructed separately.

The solenoid section A consists of a stator core 3 around which a solenoid 2 is wound.

The valve portion B includes a valve mechanism V inside the housing 10. This valve mechanism V includes a shaft 17 and moving cores 1 provided at both ends of the shaft 17.
8, the valve 30, and the leaf springs 20, 26 as elastic members that movably support the shaft 17 in the axial direction.
It is a unit part consisting of etc. The moving core 18 is a member that electromagnetically moves toward and away from the tip of the stator core 3. Further, the valve 30 opens and closes a communication passage 33 provided in the housing 10. Note that 25 is a return spring, and 34 is an adjustment spring. The solenoid part A and the valve part B are separably connected and integrated with the tip of the stator core 3 and the moving core 18 facing each other. therefore,
The solenoid section A and the valve section B can be separated at any time, and the valve mechanism V can also be separated from the housing of the valve section B at any time.

FIG. 2 is a sectional view of the electromagnetic valve according to this embodiment. The solenoid part A has a cylindrical case 1,
A stator core 3 around which a solenoid 2 is wound is housed inside the stator core 3. The stator core 3 has a sharp point at one end, and the other end (upper end) is caulked to the center of a plate 4 fixed to the end of the case 1. A resin cap 5 is attached to the upper end of the case 1, a part of which forms a coupler socket 6, into which a coupler terminal 7 is attached.
is integrated with the cap 5 so that a portion thereof is exposed. The coupler terminal 7 is electrically connected to the solenoid 2 through a lead wire 8. A large-diameter base portion 9 is attached to the other end of the case 1 and forms a joint portion with the valve portion B.

The valve part B has a housing 10 having approximately the same diameter as the case 1, and a flange 11 is formed at one end of the housing 10, which forms a joint with the solenoid part A. The valve mechanism V is housed within the housing 10 as described above. The valve mechanism V has a bottomed cylindrical fixing member 13 supported on a stepped portion 12 formed in the middle of the housing 10 . The fixing member 13 is a fixing member for each outer peripheral portion of a pair of leaf springs, which will be described later, and is arranged upside down between both leaf springs.
is located above, and its upper end extends further upwards from this bottom to form an edge 15. Note that a vent hole 16 is formed in a part of the outer circumferential wall surface of the fixing member 13, and communicates with a suction port described later. A shaft 17 is provided vertically passing through the center of the fixed member 13, and a bottomed cylindrical moving core 18 is integrally provided at the top of the shaft 17.
A circular leaf spring 20 is attached to the moving core 18 by a washer 19, and its periphery is held between the base 9 and the tip of the edge 15 via a corrugated washer 21. Further, the cylindrical portion of the moving core 18 is designed to accommodate the pointed head of the stator core 3, and a spacer 22 is provided at the center of the bottom thereof. Fixed member 1
A bellows-shaped elastic pressure bulkhead 23 is disposed within the shaft 17 and surrounds the shaft 17. Elastic pressure bulkhead 2
3 defines a communication chamber around the shaft 17 to reduce the pressure difference acting on the valve 30. The outer periphery of the elastic pressure partition 23 is connected to the bottom 1 of the fixing member 13.
4, and the shaft 17 passes through it to form a joint that tightly fits around the periphery, and its upper surface is connected to the large diameter portion 24 formed in the shaft 17.
It is locked to. The lower end of a coil-shaped return spring 25 disposed around the shaft 17 within the elastic pressure bulkhead 23 is locked to the large diameter portion 24 . The combined lower surface of the elastic pressure bulkhead 23 is supported by a lower leaf spring 26. The shaft 17 penetrates the center portions of the leaf springs 20 and 26 in a skewered manner. This leaf spring 26
is provided at the lower end of the fixed member 13, and the shaft 1 passes through the center of the leaf spring 26 below the leaf spring 26.
It is supported by a ring 27 fitted around the ring 7. The periphery of the leaf spring 26 is held between the lower end of the fixing member 13 and the stepped portion 12 via a corrugated washer 31. A collar 28 is fitted onto the lower end of the shaft 17, and a valve 30 is attached integrally with the collar 28. The valve 30 is made by laminating an elastic material such as plastic around a flange-like insert 29 that is integral with the collar 28.
The valve 30 is fixed to the shaft 17 via a collar 28 by a caulking 32 at the tip of the shaft 17. Therefore, valve 30, shaft 1
7, the fixing member 13, etc. constitute an integrated independent component and constitute a valve mechanism V.

Note that the valve 30 closes the upper opening of the communication passage 33 provided at the bottom of the housing 10 and closes the upper opening of the communication passage 33 provided at the bottom of the housing 10.
An initial load upon opening the valve is applied by a coil-shaped adjusting spring 34 disposed within the valve. This initial load can be adjusted using an adjustment screw 35. The communication passage 33 communicates an intake port 36 and a discharge port 37 that are open on the side of the housing 10, and the intake port 36 communicates with, for example, outside air, and the discharge port 37 communicates with, for example, a carburetor of an internal combustion engine. . Although the suction port 36 and the discharge port 37 can be used by connecting a separate joint 38 as shown, they can also be directly attached to a carburetor or the like without using the joint 38. Further, a communication chamber defined by the elastic pressure partition 23 communicates with the suction port 36 via the ventilation hole 16, and this communication chamber is separated from the discharge port 37 by the elastic pressure partition 23 when the valve is closed. be done.

To assemble the electromagnetic valve constructed in this way, first arrange the adjuster spring 34 in the housing 10, then attach the valve mechanism V to the valve 3.
0 closes the opening of the communication passage 33 and contacts the adjusting spring 34.
0 and assemble valve part B. Furthermore, with the tip of the stator core 3 facing the moving core 18, the solenoid part A is overlapped with the valve part B, and the base 9
and the flange 11 are joined together and fixed with connecting bolts 39 or the like. As a result, the solenoid section A and the valve section B, which are configured separately, are easily and separably connected and integrated.

In this assembly process, since the valve mechanism V itself is constructed as a single component, there are many small parts inside the housing 10 that are difficult to position, such as the leaf springs 20 and 26, the coil spring 25, the shaft 17, and the valve 30. There is no need to assemble parts separately. Therefore, highly accurate products can be assembled in an extremely short time without requiring any skill.

Note that when disassembling for repair or replacement, the connection between solenoid part A and valve part B is separated. Thereby, the two can be separated into separate bodies, and the valve mechanism V can also be separated as an integral part.

Next, the operation of this electromagnetic valve will be explained. Second
The diagram shows the state when the valve is closed. When the solenoid 2 is energized in this state, a magnetic force is generated in the stator core 3. Due to this magnetic force, the moving core 18 is attracted toward the stator core 3, and the leaf springs 20,
26, moves against each elasticity of the return spring 25. At the same time, the shaft 17 is integrated with the moving core 18 and supported on both sides by leaf springs 20 and 26.
The valve also moves upward together with the valve 30, but this movement is guided by the pair of leaf springs 20 and 26, so
This results in extremely high centering accuracy with little lateral runout. Moreover, when the valve 30 moves upward and opens,
Although the pressure difference between the suction port 36 and the discharge port 37 is large, there is an elastic pressure partition 23 around the shaft 17.
Since there is a communication chamber defined by and communicating with the suction port 36, the pressure difference acting on the valve 30 is reduced. Therefore, the valve 30 opens quickly and stably, and when the communication passage 33 is opened, the suction port 36 and the discharge port 37 communicate with each other. As a result, outside air is discharged from the suction port 36, through the communication path 33, through the discharge port 37, and further to the outside.

After that, when the energization is stopped, the stator core 3
Since the magnetic force disappears, the moving core 18 immediately separates from the stator core 3, and the leaf springs 20, 2
6. The shaft 17 returns downward due to the elasticity of the return spring 25, and the valve 30 closes.
As a result, the communication path 33 is closed, and the suction port 3
The inflow of outside air from 6 to the discharge port 37 is cut off.

A pair of leaf springs 20, 26, etc., whose respective ends are supported by the fixing member 13 with a vertical interval from the base 9 and the housing 10, are provided, and the shaft 17 is mounted at the center of each of these leaf springs 20, 26. Since the shaft 17 is supported, the shaft 17 is supported on both sides, and when it moves in the axial direction, lateral vibration is prevented and the valve can be opened and closed accurately. Moreover, these leaf springs 20 and 26 are not required for the shaft 1, which was conventionally required.
7 and the moving core 18, it eliminates the need for a bearing member that requires a lot of processing man-hours, and also improves the centering accuracy by using a special system that was necessary to deal with the lateral runout of the moving core 18. structure can be omitted. Furthermore, since it is not necessary to lengthen one end of the shaft 17 to penetrate into the stator core 3 and support it,
Since the shaft 17 is correspondingly shorter than the conventional one, the inertial mass of the movable part is reduced, and high-speed response in opening and closing the valve is achieved. Moreover,
Since the connecting portion of the elastic pressure bulkhead 23 and the shaft 17 is supported by the leaf spring 26, lateral vibration of this portion is prevented, so that airtightness at the connecting portion of the elastic pressure bulkhead 23 and the shaft 17 can be maintained. .

Further, in this embodiment, since the valve mechanism V is also configured as a unit, various small parts such as the leaf springs 20 and 26, the coil spring 25, and the valve 30 are separated in a narrow space such as the inside of the housing 10. Eliminates assembly work. Therefore, the main factors that degrade assembly accuracy can be avoided.

[Effects of the invention] Since the solenoid part and the valve part are each constructed separately, the electromagnetic valve can be assembled or disassembled extremely easily. Therefore, since both can be separated in advance and mass-produced, workability and assemblability are improved. Next, when repairing or replacing internal parts, by separating them at their connecting parts, they can be easily disassembled into separate parts, so only the necessary parts can be taken out and repaired or replaced. Therefore, it is easy to maintain and is advantageous for long-term use.

Furthermore, by employing such a divided structure, manufacturability can be improved. Furthermore, since one end of the shaft is not supported through the stator core, the shaft can be made shorter than before, so the inertial mass of the movable part can be reduced, and high-speed response in opening and closing the valve can be achieved.

Furthermore, since the shaft is supported on both sides by a pair of leaf springs so that it can move in the axial direction, it is possible to improve the centering accuracy in the shaft axial direction and further improve the opening and closing accuracy of the valve.At the same time, these leaf springs are integrated with the shaft. Since it constitutes a valve mechanism, the above-mentioned maintainability is not impaired.

Furthermore, since one of the leaf springs supports the connecting portion between the elastic pressure partition and the shaft, it is possible to prevent lateral vibration of this portion and maintain airtightness.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a conceptual diagram and FIG. 2 being a sectional view. FIG. 3 is a conceptual diagram of a conventional example. Explanation of symbols, A... Solenoid part, B... Valve part, V... Valve mechanism, 1... Case, 2...
Solenoid, 3... Stator core, 10... Housing, 13... Fixing member, 17... Shaft,
18... Moving core, 20, 26... Leaf spring (elastic member), 23... Elastic pressure partition, 25... Return spring, 30... Valve, 33... Communication path, 36... Suction port, 37... ...Discharge port.

Claims (1)

[Scope of utility model registration request] A solenoid part A in which a stator core 3 around which a solenoid 2 is wound is fixed in a case 1, and a valve part B in which a valve mechanism V is inserted and arranged in a housing 10 are formed separately. A and a valve part B are separably connected and integrated, and the valve mechanism V is provided with a valve 30 at one end for opening and closing a communication passage 33 between a discharge port 37 and a suction port 36 provided in the housing 10, The other end is equipped with a shaft 17 provided with a moving core 18 disposed facing the tip of the stator core 3, and a communication chamber around the shaft 17 that communicates with the suction port 36 side and is isolated from the discharge port 37 when the valve is closed. A pair of leaf springs 20 and 26 are arranged at intervals in the axial direction of the shaft 17, and each end of these leaf springs 20 and 26 is By fixing the shaft 17 and supporting the shaft 17 at the center, the pair of leaf springs 20 and 26 support the shaft 17 on both sides so that it can move in the axial direction, and each end is inserted between the leaf springs 20 and 26. The outer circumferential portion of the elastic pressure partition 23 is supported by a fixing member disposed for fixing, and the center portion of the elastic pressure partition 23 is tightly fitted and connected to the peripheral side of the shaft 17, and this joint is An electromagnetic valve characterized in that it is supported on the central side of one leaf spring 26.