JP3624557B2 - Solenoid valve terminal structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a terminal structure of an electromagnetic valve, and in particular, a solenoid part for driving a valve body is exposed to outside air, such as an electromagnetic valve used in an automatic transmission of a vehicle, and requires a waterproofing treatment of an electrical connection part. The present invention relates to a terminal structure of a solenoid valve.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, a solenoid valve 200 used for hydraulic control of an automatic transmission of an automobile has a cross-sectional structure shown in FIG. 5 (Japanese Utility Model Publication No. 7-40135).
In the electromagnetic valve 200, when the coil 154 is not energized, the moving body 176 is biased in the direction away from the core 146 by the elastic force of the spring 174 and closes the import 164. When the coil 154 is energized via the lead wire 158 and the terminal 156, a magnetic circuit is formed by the core 146, the yoke 140, the base 142 and the core plunger 170. As a result, a suction force is generated between the core plunger 170 and the core 146, and the moving body 176 is attracted to the core 146 and stops against the urging force of the spring 174. The import 164 is opened by the movement of the moving body 176.
This electromagnetic valve 200 is used to prevent water or the like from entering the connecting portion between the core 146 and the yoke 140 and the electric connecting portion between the core 146 and the lead pin 157 in order to improve the body ground. The rubber boot 160 is attached to the end of the yoke 140, and the inside thereof is filled with an epoxy resin 162 to ensure airtightness.
[0003]
[Problems to be solved by the invention]
However, in the above prior art, the lead pin 157 and the core 146, and the terminal 156 and the coil 154 are electrically connected by soldering or the like to secure the internal airtightness, and the core 146 is caulked and fixed to the yoke 140. Since the rubber boot 160 is assembled to the end of the yoke 140 and the inside thereof is filled with the epoxy resin 162, there is a problem that the rubber boot 160 cannot be efficiently manufactured. That is, since the configuration is such that the epoxy resin 162 is filled after the entire assembly is assembled, the number of assembling steps increases, and the cost of the solenoid valve 200 increases.
[0004]
Therefore, in view of the above problems, an object of the present invention is to provide a solenoid valve that can obtain a good body ground and has high manufacturing efficiency.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the means described in claim 1 can be employed. According to this means, the exciting coil is wound around the cylindrical winding member, and one end of the exciting coil is electrically connected to the first terminal for supplying power that protrudes to the outside. The other end of the exciting coil is electrically connected to a cylindrical second terminal housed inside the winding member. Then, the core portion and the second terminal are brought into contact with each other inside the winding member, and the yoke portion formed integrally with the core portion and the second terminal have the same potential.
As a result, the second terminal, the core portion, and the yoke portion are electrically connected to each other, so that a good body ground can be achieved through the route of the second terminal → the core portion → the yoke portion, and the second terminal and the core portion are connected. Since the location to be done is the inside of the winding member, it is possible to suppress external water from reaching this location. Further, by fitting the cylindrical second terminal to the core portion, electrical connection between the second terminal and the core portion can be obtained, and the manufacturing efficiency can be increased.
[0006]
According to the second aspect of the present invention, the winding member, the exciting coil, the first terminal, and the second terminal are fixed to the casing having the opening on the valve body side by resin insert molding.
As a result, it is possible to assemble only the solenoid portion that drives the valve body, and therefore the manufacturing efficiency of the electromagnetic valve can be further increased.
[0007]
According to the means of the third aspect, the opening of the casing is formed in a standardized predetermined size and is fitted to the housing on the valve body side.
As a result, by forming the flange of the housing on the valve body side into a size and shape that conforms to the standard of the opening of the casing, the casing can be assembled to various types of valve bodies, and the application range of the electromagnetic valve is widened. be able to.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on specific examples.
FIG. 1 is a schematic sectional view showing the configuration of the first embodiment according to the present invention. In an automatic transmission of an automobile, an electromagnetic valve 1 used for gear shift control includes a solenoid unit 5 that generates a magnetic field mainly by supplying electric power from the outside, and a piping passage unit 2 that supplies a working hydraulic pressure to a required part. It consists of and.
[0009]
First, the structure of the piping passage part 2 is demonstrated. The housing 100 of the pipe passage portion 2 is made of soft iron and is formed in a cylindrical shape. The housing 100 includes an import 31 for introducing hydraulic oil pressurized to a predetermined pressure, an out port 32 for supplying hydraulic oil flowing from the import 31 for gear shift control, and a drain port 33 opened to the atmosphere. Three ports are provided. The import 31 is provided with a filter 30 made of a resin material in order to remove foreign matters such as fine metal pieces in the hydraulic oil. Further, in the vicinity of the import 31, a ball 21 as a metal sphere is elastically biased in a direction away from the import 31 by a spring 23. The ball 21 forms a valve body 20 with a plunger 22 which will be described later, and contacts the seat portion 27 of the housing 100 so that the import 31 side does not communicate with the out port 32 side and the drain port 33 side. ing.
[0010]
A plunger 22 made of stainless steel is disposed in the housing 100, and an upper portion 22a thereof is press-fitted and fixed to a movable core 25 made of a magnetic material. On the lower side of the movable core 25 in the figure, a nonmagnetic guide 24 made of brass is provided around the plunger 22 as a guide for the movement of the plunger 22 in the axial direction.
In the lower portion 22 b of the plunger 22, the side surface portion abuts against the seat portion 28 of the housing 100, so that the out port 32 side, the import 31 side, and the drain port 33 side are not communicated. The lower end of the lower portion 22b is a ball against the elastic force of the spring 23 by the elastic bias of the spring 26 of the solenoid unit 5 when the solenoid unit 5 is turned off and the plunger 22 moves downward (ball 21 side) in the figure. It works to push 21 downward in the figure.
The housing 100 is provided with a flange portion 29 for connection to the solenoid portion 5.
[0011]
Next, the configuration of the solenoid unit 5 will be described with reference to FIGS.
FIG. 2 is an enlarged view showing a cross-sectional configuration of the solenoid unit 5. A coil 52 (corresponding to an excitation coil) is wound around the outer periphery of a cylindrical bobbin 51 (corresponding to a winding member) made of a resin material. A metal cylindrical cap type terminal 54 (corresponding to the second terminal) is provided inside the bobbin 51. The bobbin 51 and the terminal 54 are locked by a claw portion 51a (see FIGS. 3 and 4) of the bobbin 51 and a locking hole 54b (see FIG. 4) provided in the flange portion 54a of the terminal 54. Is engaged.
[0012]
One end of the coil 52 is connected to a power supply terminal 53 (corresponding to a first terminal) connected to an external power source, and the other end is connected to a cylindrical cap type terminal 54. A front view showing the connection state of the end of the coil 52 is shown in FIG. 3, and a bottom view is shown in FIG. As shown in FIGS. 3 and 4, one end 52a of the coil 52 is electrically connected to the power supply terminal 53 by a fusing joint 60a. The other end 60b of the coil 52 is electrically connected to the flange 54a of the cylindrical cap type terminal 54 and the fusing joint 60b as shown in FIG.
[0013]
The power supply terminal 53, the coil 52, the bobbin 51, and the cylindrical cap type terminal 54 are fixed to the case 59 by resin insert molding.
Inside the bobbin 51, a stator core 57 (corresponding to a core portion) of a yoke subassembly 50 formed by cold forging and a cap-type terminal 54 are press-fitted and fixed. A yoke 56 (corresponding to a yoke portion) is disposed around the coil 52 via a case 59.
In addition, since the connection point between the stator core 57 and the cap-type terminal 54 is inside the bobbin 51, the structure has a structure in which water hardly reaches from the outside, but in order to further prevent water from entering, An O-ring 55 a is provided between the case 59 and the yoke subassembly 50 in order to prevent water or the like from entering the solenoid portion 5 from the outside. Further, the stator core 57 is provided with a recess 57a, and a spring 26 having a larger elastic force than the spring 23 of the pipe passage 2 is disposed. On the housing 100 side of the case 59, an opening 59 a having a predetermined size and shape is provided for connection to the housing 100.
[0014]
At the end of the yoke 56, a caulking portion 61 for caulking and fixing the flange portion 29 of the pipe passage portion 2 is provided. A bracket 58 is provided on the outer periphery of the yoke 56 by welding so that the electromagnetic valve 1 can be attached to a vehicle body (not shown). In FIG. 2, the part of the solenoid valve 1 located on the solenoid part 5 side from the bracket 58 is a part exposed to the outside air.
The solenoid part 5 and the pipe passage part 2 having the above-described configuration are connected by caulking the caulking part 61. At this time, an O-ring 55b is disposed between the case 59 and the housing 100, and sufficient airtightness between the solenoid portion 5 and the piping passage portion 2 can be ensured. In this way, the electromagnetic valve 1 is configured.
[0015]
Next, the operation of the electromagnetic valve 1 will be described below with reference to FIG.
First, when the solenoid unit 5 is OFF, the coil 52 is not excited. Therefore, since the elastic force of the spring 26 is larger than the elastic force of the spring 23, the spring 26 elastically biases the movable core 25, and the plunger 22 presses the ball 21 downward (spring 23 side) in the figure to compress the spring 23. Move downward in the figure. Then, the plunger 22 moves downward in the figure until the side surface portion of the lower portion 22b comes into contact with the seat portion 28.
As a result, airtightness between the seat portion 28 and the side surface of the lower portion 22b of the plunger 22 is ensured, and a gap is formed between the seat portion 27 and the ball 21, so that the drain port 33 and the outport 32 are communicated with each other. The import 31 and the outport 32 communicate with each other. In this way, the hydraulic pressure from the import 31 can be supplied to the outport 32.
[0016]
When the solenoid unit 5 is ON, the coil 52 is excited and the movable core 25 is drawn toward the stator core 57. The movable core 25 is attracted to the stator core 57 against the elastic force of the spring 26. As a result, the plunger 22 connected to the movable core 25 moves upward (toward the stator core 57) in the figure, so that the force for pushing the ball 21 downward against the elastic force of the spring 23 does not act.
Therefore, the ball 21 is elastically biased upward in the drawing by the spring 23, and the ball 21 contacts the seat portion 27 with sufficient airtightness. As a result, the import 31 and the out port 32 are not communicated with each other. Further, since the movable core 25 is attracted to the stator core 57 and the plunger 22 moves upward in the figure, a gap is generated between the side surface of the lower portion 22b of the plunger 22 and the seat portion 28, and the out port 32, the drain port 33, Communicate. In this way, the hydraulic pressure acting on the outport 32 can be reduced.
[0017]
As shown above, the coil 52 and the stator core 57 are electrically connected via the cylindrical cap type terminal 54, so that the body grounding can be surely performed through the path of the cylindrical cap type terminal 54 → the stator core 57 → the yoke 56 → the bracket 58. can do. Further, since the solenoid valve 1 can be assembled by caulking the caulking portion 61 after the solenoid portion 5 and the pipe passage portion 2 are separately manufactured, efficient production is possible. Furthermore, by forming the opening 59a of the case 59 and the flange portion 29 of the housing 100 in a predetermined size and shape, the solenoid portion 5 can be adapted to valve bodies having various configurations, and the application range is widened. can do.
[0018]
In the above embodiment, the electromagnetic valve 1 is used for gear shifting control of the automatic transmission. However, the electromagnetic valve having the terminal structure according to the present invention may be used in other devices, and the application object thereof is Not limited.
[Brief description of the drawings]
FIG. 1 is a structural diagram showing the configuration of a solenoid valve according to a first embodiment of the present invention.
FIG. 2 is an enlarged view showing a sectional configuration of a solenoid unit.
FIG. 3 is a front view showing an electrical connection structure between a coil and a power supply terminal.
FIG. 4 is a bottom view showing an electrical connection structure of a coil, a power supply terminal, and a cylindrical cap type terminal.
FIG. 5 is a schematic cross-sectional view showing a configuration of a conventional solenoid valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Piping passage part 5 Solenoid part 20 Valve body 22 Plunger 25 Movable core 29 Flange part 51 Bobbin 52 Coil 53 Power supply terminal 54 Cylindrical cap type terminal 56 Yoke 57 Stator core 58 Bracket 59 Case 60a, 60b Fusing joint part 100 Housing

Claims (3)

A solenoid valve terminal structure for driving a valve body by electromagnetic force to open and close a predetermined port,
A cylindrical winding member having an excitation coil wound around the outer periphery;
A first terminal for power supply electrically connected to one end of the exciting coil and projecting to the outside;
A cylindrical second terminal electrically connected to the other end of the exciting coil and housed inside the winding member;
A core portion housed inside the winding member;
A yoke portion that is positioned outside the excitation coil so as to surround the excitation coil, and is formed integrally with the core portion;
A terminal structure of an electromagnetic valve, wherein the second terminal and the core portion are in contact with each other inside the winding member, and the second terminal and the yoke portion have the same potential. 2. The winding member, the exciting coil, the first terminal, and the second terminal are fixed to a casing having an opening on the valve body side by resin insert molding. Terminal structure of the described solenoid valve. 3. The terminal structure of an electromagnetic valve according to claim 2, wherein the opening of the casing is formed in a standardized predetermined size and shape and is fitted to the housing on the valve body side.

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