JP2002289427A - Electromagnetic actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a coupler arrangeable on one side or the other side of a housing by using the same part in an electromagnetic actuator. SOLUTION: The electromagnetic actuator is provided with the U-shaped housing 1 which is constituted by integrally connecting first and second end walls 1a and 1b to each other through side walls 1c, a bobbin 2, a coil 3, a fixed core 5 fixed to the first end wall 1a, a movable plunger 6 piercing the second end wall 1b, a coupler 35 successively provided from the bobbin 2, and a coil cover 7a attached to the housing 1. The coil cover 7a is formed in a cylindrical shape to house the bobbin 2 and coil 3, and a coupler holding section 41 which holds the coupler 35 at a prescribed position of the cover 7a is formed on the cover 7a. On the housing 1, in addition, two attaching positions are provided for the coil cover 7a so that a first applied condition under which the coupler 35 is arranged on one side of the housing 1 or a second applied condition under which the coupler 35 is arranged on the other side of the housing 1 can be selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a U-shaped magnetic housing formed by integrally connecting opposed first and second end walls via a side wall; A bobbin disposed between the two end walls, a coil wound around the bobbin, a fixed core surrounded by the bobbin and fixed to the first end wall, and the second end wall from inside the bobbin. A movable plunger that is disposed to extend therethrough and is attracted to the fixed core by excitation of the coil, a return spring that biases the movable plunger in a direction away from the fixed core, and is connected to the bobbin. The present invention relates to an electromagnetic actuator including a coupler having a coupler terminal connected to the coil, and a coil cover that covers the coil and is attached to the housing.

[0002]

2. Description of the Related Art Such an electromagnetic actuator is already known, for example, as disclosed in Japanese Patent Application Laid-Open No. 9-92528.

[0003]

In the electromagnetic actuator, it is sometimes required that the coupler can be selectively arranged on one side or the other side of the housing according to the use condition. In such a case, in the case of such a requirement, two types of electromagnetic actuators, in which the coupler is disposed on one side or the other side of the housing, are separately manufactured in the case of the conventional electromagnetic actuator. The cost will increase significantly, leading to an increase in cost.

[0004] The present invention has been made in view of such circumstances, and uses the electromagnetic actuator in which the coupler can be selectively arranged on one side or the other side of the housing while using the same parts. The purpose is to provide.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a U-shaped, magnetic body formed by integrally connecting opposed first and second end walls via side walls. A bobbin disposed between the first and second end walls, a coil wound around the bobbin, and a fixed core surrounded by the bobbin and fixed to the first end wall; A movable plunger that is arranged to extend through the second end wall from inside the bobbin and is attracted to the fixed core by excitation of the coil; and biases the movable plunger in a direction away from the fixed core. An electromagnetic actuator comprising a return spring, a coupler provided on the bobbin and having a coupler terminal connected to the coil, and a coil cover covering the coil and attached to the housing. The cover is formed in a cylindrical shape to accommodate the bobbin and the coil, and the coil cover is provided with positioning means for holding the coupler at a predetermined position around the axis thereof, and the coupler is disposed on one side of the housing. The first feature is that the coil cover is provided with two mounting positions with respect to the housing so that a first usage mode to be used and a second usage mode disposed on the other side of the housing can be selected.

According to the first feature, the first usage mode in which the coupler is disposed on one side of the housing and the second usage mode in which the coupler is disposed on the other side only by changing the mounting position of the coil cover with respect to the housing. You can choose. Therefore, two types of electromagnetic actuators having different coupler positions can be provided at low cost without increasing the number of parts.

According to a second feature of the present invention, in addition to the first feature, a coupler holding portion fitted to the base of the coupler is formed integrally with the coil cover as the positioning means.

According to the second feature, the positioning and reinforcement of the coupler can be performed simply and reliably by fitting the coupler holding portion to the base of the coupler.

Further, in addition to the first or second feature, the present invention further comprises integrally forming a fitting attachment portion having a hollow portion with the coil cover, and forming the second end portion of the hollow portion from one end side thereof. When the wall is fitted, the coupler is in the first use mode, and when the second end wall is fitted into the hollow portion from the other end side, the coupler is in the second use mode. The feature of.

According to the third feature, it is possible to easily obtain two types of electromagnetic actuators in which the positions of the couplers are different simply by changing the direction in which the end wall is fitted to the fitting mounting portion of the coil cover. it can.

Further, according to the present invention, in addition to any one of the first to third aspects, the first end wall is formed narrower than the side wall,
A fourth feature is that the coupler is selectively disposed adjacent to one side and the other side of the first end wall.

According to the fourth feature, in the housing, the first end wall is set to be narrower than the side wall, so that the housing of the coupler housing arranged adjacent to one side or the other side of the first end wall. Of the electromagnetic actuator A can be reduced in size.

Still further, according to the present invention, in addition to any one of the first to fourth features, a mounting boss used for screwing the housing to the support is formed on the side wall so as to protrude toward the inner surface thereof. On the other hand, a fifth feature is that relief holes capable of receiving the protruding end portions of the mounting bosses are provided on opposite side walls of the coil cover.

According to the fifth feature, the coil cover can be mounted on the housing without being interfered by the mounting boss even in the first and second modes of use. In addition, a screw hole whose effective length is sufficiently longer than the thickness of the housing can be formed in the mounting boss, and the screw can be firmly fixed to the support.

Still further, according to the present invention, in addition to any one of the first to fifth features, the coil cover is connected to a plunger cover for covering an outer periphery of an outer end of the movable plunger, and is connected to an outer end of the movable plunger. A sixth feature is that a stopper arm for engaging the circular flange of the joint member and restricting outward movement of the joint member is integrally formed.

According to the sixth feature, in any of the first and second modes of use, the portion of the movable plunger exposed outside the housing is covered with the plunger cover integral with the coil cover, thereby preventing dust from entering. The movable plunger can be protected from contact with other objects, and the movable plunger can be prevented from coming off by the stopper arm integrated with the plunger cover. It prevents falling off and makes it easier to handle. Further, at this time, by making the flange of the joint member engaged with the stopper arm circular, the engagement between the flange and the stopper arm can be always performed reliably at any rotational position of the movable plunger.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIG. 1 is a longitudinal sectional plan view of an electromagnetic actuator according to the present invention, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG.
4, FIG. 4 is a view from arrow 4 in FIG. 1, and FIG.
6 is a perspective view of the housing of the electromagnetic actuator, FIG. 7 is a perspective view of one end of a cover assembly of the electromagnetic actuator, and FIG. 8 is a view of the other end of the cover assembly. FIG. 9 is a perspective view and FIG. 9 is an explanatory view of an assembling process of the electromagnetic actuator.

As shown in FIGS. 1 to 6, the electromagnetic actuator A mainly includes a housing 1, a bobbin 2, a coil 3, a guide sleeve 4, a fixed core 5, a movable plunger 6, and a cover assembly 7.

In FIG. 1 and FIG.
It is formed by pressing a plurality of magnetic steel plates into a U-shape and includes first and second end walls 1a and 1b before and after facing each other and a side wall 1c connecting these end walls. Wall 1
The both side edges of “a” are closer to the inside than both side edges of the side wall 1c, and the width of the first end wall 1a is set smaller than the width of the side wall 1c. A positioning protrusion 8 and a mounting boss 9 are provided on the side wall 1c, and the electromagnetic actuator A is fixed to an appropriate position of the support S by a bolt 10 using these. The first end wall 1a of the housing 1 is provided with a small-diameter support hole 11 at the center thereof. The second end wall 1b has a large-diameter support hole 1 coaxially aligned with the small-diameter support hole 11.
2 is drilled. The mounting boss 9 is formed so as to protrude toward the inner surface of the side wall 1c by burring from the outside of the side wall 1c. Therefore, the mounting boss 9
A screw hole whose effective length is sufficiently longer than the thickness of the side wall 1c can be formed, and the screwing to the support S can be performed firmly.

2 and 3, the bobbin 2 is made of a synthetic resin and has a cylinder 2c around which the coil 3 is wound, a thick flange 2a connected to one end of the cylinder 2c, and a bobbin 2c. And a thin flange 2b connected to the end. The inner diameter of the cylinder 2c is set to be substantially the same as that of the large-diameter support hole 12,
The distance between the outer surfaces of the two flanges 2a, 2b is set substantially equal to the distance between the inner surfaces of both end walls 1a, 1b of the housing 1.

A coupler housing 13 extending axially outward from an outer peripheral edge of the thick flange 2a is integrally connected to the thick flange 2a. The coupler housing 13 is formed integrally with the bobbin 2. Therefore, if the bobbin 2 is inserted between both end walls 1a and 1b of the housing 1, the thick flange 2a of the bobbin 2 is provided on the inner surface of the first end wall 1a and the thin flange 2b is provided on the inner surface of the second end wall 1b. The bobbin 2 is in close contact with it, and the axial movement of the bobbin 2 is prevented. At that time, bobbin 2
Are arranged such that the coupler housing 13 is located on one side or the other side of the first end wall 1a according to the use state of the electromagnetic actuator A (see FIGS. 3 and 4).

In the housing 1, as described above, the width of the first end wall 1a is set smaller than the width of the side wall 1c. Therefore, one side of the first end wall 1a is reduced by the reduced width. Alternatively, the amount of lateral protrusion of the coupler housing 13 disposed adjacent to the other side from the housing 1 is reduced, and the electromagnetic actuator A can be made compact.

A guide sleeve 4 made of a non-magnetic metal is fitted in the large-diameter support hole 12 of the cylinder 2c and the second end wall 1b of the bobbin 2, and a fixed core 5 and a movable plunger 6 are arranged in the guide sleeve 4. The movable plunger 6 is provided with the guide sleeve 4
It can slide inside.

The fixed core 5 has a columnar shape. An annular groove 19 is formed on the outer periphery of one end, and a small shaft 20 is formed on one end surface thereof. Further, at the other end, a tapered hole 21 opened on the end face and a concave portion 22 connected to the small-diameter end of the tapered hole 21 are provided. The fixed core 5 is tightly fitted to the inner peripheral surface at one end of the guide sleeve 4, and by caulking several portions of the sleeve 4 corresponding to the annular groove 19,
Several caulking projections 23 raised from the inner peripheral surface of the sleeve 4 are locked in the annular groove 19. By performing such a caulking connection, the caulking projections 23 can be formed with a relatively light caulking force, the distortion of the guide sleeve 4 and the fixed core 5 can be prevented, and the coaxiality between the two can be secured. .

The fixed core 5 is disposed so that its small shaft 20 is inserted into the small-diameter support hole 11 of the first end wall 1a of the housing 1 and is in close contact with the inner surface of the end wall 1a. The end is formed in the enlarged portion 20a by swaging. Thus, the fixed core 5 is fixed to the first end wall 1a of the housing 1. Therefore, the guide sleeve 4 is fixed to the housing 1 via the fixed core 5.

The other end of the guide sleeve 4 is
Is inserted into the large-diameter support hole 12 of the second end wall 1b.
It protrudes long outward from the second end wall 1b. Due to this projection, the support span of the guide sleeve 4 with respect to the movable plunger 6 is increased, and the inclination of the movable plunger 6 can be suppressed as much as possible.

The movable plunger 6 has a tapered shaft portion 6a corresponding to the tapered hole 21 of the fixed core 5 at an inner end. A small shaft 32 having an enlarged head 32a protrudes from an end face of the tapered shaft portion 6a, and an elastic stopper 33 made of rubber or the like is mounted on the small shaft 32. The elastic stopper 33 comes into contact with the bottom surface of the concave portion 22 of the fixed core 5 in order to regulate the approach distance of the movable plunger 6 to the fixed core 5 at a constant level. Absorbed by compressive deformation.

A joint member 24 is attached to an outer end of the movable plunger 6 projecting from the guide sleeve 4. The joint member 24 is made of a synthetic resin and has a cylindrical portion 24a.
And an eyeball portion 24c protruding from the end wall 24b. The cylindrical portion 24a is press-fitted to the outer peripheral surface of the outer end of the movable plunger 6, and an actuated member 26 is connected to the eyeball portion 24c. It has become. The cylindrical portion 24a
Are formed integrally with a plurality of horizontal holes 27 and a locking claw 28 having a claw at the tip facing the horizontal hole 27 and bent inward in the radial direction. When the outer end surface of the movable plunger 6 press-fitted into 24a comes into contact with the end wall 24b, the movable plunger 6 engages with the annular groove 29 on the outer periphery of the movable plunger 6 with its own elastic force. Therefore, even if the press-fit connection between the cylindrical portion 24a and the movable plunger 6 becomes loose, the detachment of the joint member 24 can be prevented.

Further, the cylindrical portion 24a of the joint member 24
The tapered portion 30 and the tapered portion 3
A circular flange 31 rising from the large-diameter end (see FIG. 5)
Are formed. A return spring 25 formed of a tapered coil spring is contracted between the flange 31 and the second end wall 1b of the housing 1, and the movable plunger 6 is urged in a direction away from the fixed core 5 by the spring force. .

When the coil 3 is energized and excited, the magnetic flux flowing through the fixed core 5 and the movable plunger 6 through the housing 1 generates an attractive force between the two cores 5 and 6, and the movable plunger 6 The return spring 25 is compressed and moved forward toward the fixed core 5 from the solid line position in FIG.

From the thick flange 2 a of the bobbin 2 to the coupler housing 13, a pair of coupler terminals 34 connected to both ends of the coil 3 are mode-coupled. A noise preventing diode 38 is connected between the two coupler terminals 34, and a concave portion 39 for accommodating the diode 38 is formed on the outer end surface of the thick flange 2a. As a result, the diode 38 can be protected from contact with other objects and intrusion of dust and the like.

A coupler 35 is constituted by the coupler housing 13 and a pair of coupler terminals 38, and a power supply-side coupler (not shown) is connected to the coupler 35.

The coupler 35 is provided at the end of the bobbin 2 opposite to the joint member 24, that is, at the thick flange 2a.
It will be installed continuously. By doing so, the distance between the coupler 35 and the joint member 24 can be set large, and interference between the lead wire of the power supply-side coupler and the joint member 24 can be reliably prevented.

The housing 1 is provided with a cover assembly 7 made of synthetic resin for covering the coil 3 and a portion of the movable plunger 6 exposed outside the housing 1. The cover assembly 7 will be described with reference to FIGS.

The cover assembly 7 includes a coil cover 7a for covering the entire outer peripheral surface of the coil 3 and a plunger cover 7 for covering a portion of the movable plunger 6 exposed outside the housing 1.
b and a common fitting portion 7c for integrally connecting the covers 7a and 7b.

The coil cover 7a has a rectangular tube shape with a rectangular cross section, and is disposed between the first and second end walls 1a and 1b of the housing 1 while covering the outer periphery of the coil 3.
At this time, the long side of the rectangular cross section of the coil cover 7a is arranged parallel to the side wall 1c of the housing 1. A positioning groove 40 having an arcuate cross section is formed in the inner surface of the opposite side wall on the long side of the coil cover 7a, in which a part of the outer peripheral surface of both flanges 2a and 2b of the bobbin 2 is fitted.

On the side opposite to the plunger cover 7b, the coil cover 7a is integrally provided with a coupler holding portion 41 having a U-shaped cross section which is fitted to the base of the coupler housing 13 on one short side of the rectangular cross section. It is formed.

Further, in the coil cover 7a, a pair of escape holes 42 are respectively formed on both side walls on the long side. Each of the escape holes 42 has a long side wall on the side wall 1 of the housing 1.
c, when mounted on the inner surface, the mounting boss 9 of the side wall 1c.
Are disposed so as to be able to receive the protruding end portion. Therefore,
The position of the coupler holding portion 41 is changed to the first end wall 1a of the housing 1.
Both sides on the long side of the coil cover 7a can be overlapped on the inner surface of the side wall 1c of the housing 1 without being interfered by the mounting boss 9 so that the left side and the right side can be selected. . Thus, only by changing the mounting position of the coil cover 7a with respect to the housing 1, the first use mode in which the coupler 35 is arranged on one side of the housing 1 and the second use mode in which the coupler 35 is arranged on the other side can be selected. Therefore, two types of electromagnetic actuators A having different positions of the coupler 35 without increasing the number of parts
Can be provided at a low cost.

The escape holes 42 and the fitting attachment portions 7c are arranged such that their axes are parallel to each other. By doing so, when molding the cover assembly 7 made of synthetic resin, the molding die can be easily removed from the fitting / attachment portion 7c and each of the clearance holes 42 with the same removal direction.

On the other hand, the plunger cover 7b has a cylindrical shape and is arranged so as to cover a portion of the movable plunger 6 exposed outside the housing 1. Fitting attachment part 7c
Has a hollow portion 43 open at both ends corresponding to the cross-sectional shape of the second end wall 1 b of the housing 1.
3 is fitted with the second end wall 1b. At this time, the first end wall 1a of the housing 1 comes into contact with the end face of the coil cover 7a on the side opposite to the fitting and attaching portion 7c, and therefore, cooperates with the second end wall 1b. Cover 7
a can be clamped.

The movable plunger 6 is engaged with the plunger cover 7b by engaging with the flange 31 of the joint member 24.
Arm 45 for preventing the release from the guide sleeve 4
Is constituted by a part of the peripheral wall of the cover 7b. At this time, a pair of slits 46 adjacent to both sides of the stopper arm 45 are formed in the plunger cover 7b.
Is cut from the outer end side. Thereby, each stopper arm 4
5, the plunger cover 7b is provided with elasticity in the radial direction. Also, the cutting depth of the slit 46 is the stopper arm 4.
5 to determine the effective length.

The stopper arm 45 is connected to the plunger cover 7b.
Are provided at two locations opposing each other on the diameter line, and the ends of the flanges 31 are provided with the stopper arms 45 in a free state.
An inward hook 47 that can be engaged with the outer end face of the body is integrally formed. A slope 47a is formed at the outer end of the hook 47. The slope 47a is connected to the joint member 24.
When the flange 31 is inserted into the plunger cover 7b,
As a result, the stopper arm 45 is deflected radially outward.

When assembling the electromagnetic actuator A, the bobbin 2 with the coil 3 is inserted into the coil cover 7a of the cover assembly 7 as shown in FIG. Is fitted to the coupler holding portion 41. At this time, the flanges 2a and 2b of the bobbin 2 are fitted into the positioning grooves 40 on the inner wall of the coil cover 7a, so that the bobbin 2 and the coil cover 7a are concentrically fitted. Further, since the coupler holding portion 41 is fitted to the base of the coupler housing 13, the positioning and reinforcement of the coupler 35 can be performed simply and reliably. At this time, the bobbin 2 and the coil cover 7a are positioned relative to each other by abutting the distal end surface of the coupler holding portion 41 against the coupler housing 13, the outer end surfaces of the thick flange 2a and the coil cover 7a are flush with each other, and the thin flange The outer end surface of 2b and the inner surface of the fitting attachment portion 7c are flush.

Therefore, next, as shown in FIG. 9B, the first end wall 1a of the housing 1 is fixed to the coil cover 7a.
When the second end wall 1b is fitted into the hollow portion 43 of the fitting attachment portion 7c of the cover assembly 7 while sliding on the outer end surface of the thick flange 2a, the coil cover 7a and the coil cover 7a are provided between both end walls 1a, 1b. The bobbin 2 can be smoothly inserted.
At this time, depending on which side of the two openings of the fitting attachment portion 7c the second end wall 1b is fitted from, the coupler housing 1
3 above the housing 1 as shown in FIG. 2 (solid line position)
Or, it is arranged below (the position of the chain line).

Subsequently, as shown in FIG. 9C, the guide sleeve 4 caulked to the fixed core 5 is inserted into the large-diameter support hole 12 of the housing 1 and the cylinder 2c of the bobbin 2, and the fixed core 5 is fixed. 5 is inserted into the small-diameter support hole 11 of the housing 1. Then, as shown in FIG. 9 (D), the outer end of the small shaft 20 is swaged to form the enlarged portion 20a. Thus, the fixed core 5 and the guide sleeve 4 are fixed to the housing 1. As a result, the first and second end walls 1a, 1 of the bobbin 2
b, and the detachment of the fitting attachment 7c of the cover assembly 7 from the second end wall 1b is prevented. Therefore, a special fixing member for preventing the fitting and attaching portion 7c from being detached from the second end wall 1b is unnecessary, so that the structure can be simplified and the assembling property can be improved.

Finally, as shown in FIG.
Then, the movable plunger 6 equipped with the joint member 24 is inserted into the guide sleeve 4. In this case, when the joint member 24 is pushed into the plunger cover 7b, the flange 31 slides on the slopes 47a of the pair of stopper arms 45 of the plunger cover 7b.
Since the hook 47 is removed to the outside while bending 5, the flange 31 can pass smoothly in front of the hook 47. When the pushing force is released from the movable plunger 6 after the passage, the movable plunger 6 is retracted by the return force of the return spring 25, but the outer end surfaces of the flange 31 of the joint member 24 engage with the hooks 47 of both stopper arms 45. This prevents the movable plunger 6 from coming out of the guide sleeve 4.

Thus, the coil 3 and the plunger 6
It is covered with a coil cover 7a and a plunger cover 7b which constitute the integral cover assembly 7, respectively, and is protected from intrusion of dust and contact with other objects. Moreover, the movable plunger 6 can be easily prevented from coming out of the guide sleeve 4 by using the plunger cover 7b. Therefore, the movable plunger 6 does not fall off during transportation or other handling of the electromagnetic actuator A, and the handling becomes easy.

Also, at the time of assembly, the flange 31 can be engaged with the hooks 47 of the both stopper arms 45 simply by inserting the joint member 24 into the plunger cover 7b at random. Moreover, since the flange 31 is circular, the engagement between the flange 31 of the joint member 24 and the hook 47 of the stopper arm 45 can always be reliably performed at any rotational position of the movable plunger 6, and the assemblability is extremely high. It will be good. Further, when the electromagnetic actuator A is disassembled, each hook 47 is disengaged from the flange 31 of the joint member 24 only by bending the stopper arms 45 outward against their elastic force, and the movable plunger 6 is guided by the guide sleeve. 4
Can be pulled out from the machine and the maintenance is good.

Further, hooks 47 of both stopper arms 45 are
Since it engages with both sides of the flange 31 which are opposed to each other in a diameter line, a stable engagement state with the flange 31 can be always obtained.

Furthermore, the flange 31 of the joint member 24 supports the movable end of the return spring 25 on its inner surface,
Since the outer side surface performs two different functions of engaging with the hook 47 of the stopper arm 45, it can contribute to the simplification and compactness of the structure of the electromagnetic actuator A.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist of the present invention. For example, fixed core and guide sleeve
Instead of caulking, they can be joined by welding, brazing, or the like.

[0053]

As described above, according to the first aspect of the present invention, a U-shaped magnetic material is formed by integrally connecting opposed first and second end walls via a side wall. A bobbin disposed between the first and second end walls, a coil wound around the bobbin, a fixed core surrounded by the bobbin and fixed to the first end wall; A movable plunger that is arranged to extend through the second end wall from inside the bobbin and is attracted to the fixed core by excitation of the coil; and a return biasing the movable plunger in a direction away from the fixed core. An electromagnetic actuator comprising: a spring, a coupler terminal connected to the bobbin and connected to the coil, and a coil cover covering the coil and attached to the housing. And forming in a cylindrical shape to accommodate the bobbin and coil, the coil cover,
Positioning means for holding the coupler is provided at a predetermined position around the axis, and a first use mode in which the coupler is arranged on one side of the housing and a second use mode in which the coupler is arranged on the other side of the housing are selected. The coil cover is provided with two mounting positions with respect to the housing so as to obtain the first usage mode in which the coupler is arranged on one side of the housing only by changing the mounting position of the coil cover with respect to the housing. The second usage mode to be arranged can be selected. Therefore, two types of electromagnetic actuators having different coupler positions can be provided at low cost without increasing the number of parts.

According to the second feature of the present invention, in addition to the first feature, a coupler holding portion fitted to the base of the coupler is formed integrally with the coil cover as the positioning means. By fitting the coupler holding portion at the base of the coupler, the positioning and reinforcement of the coupler can be performed simply and reliably.

According to a third feature of the present invention, the first
Alternatively, in addition to the second feature, when the fitting cover having a hollow portion is integrally formed with the coil cover, and the second end wall is fitted into the hollow portion from one end thereof, the coupler is connected to the second end wall. When the second end wall is fitted into the hollow portion from the other end side, the coupler is in the second use mode. Therefore, the end wall of the coil cover is fitted to the fitting attachment portion of the coil cover. By simply changing the fitting direction, two types of electromagnetic actuators having different coupler positions can be easily obtained.

According to a fourth feature of the present invention,
In addition to any one of the first to third features, the first end wall is formed narrower than the side wall, and the coupler is selectively disposed adjacent to one side and the other side of the first end wall. Therefore, the amount of lateral protrusion of the coupler housing arranged adjacent to one side or the other side of the first end wall from the housing is reduced by the amount of setting the first end wall narrower than the side wall in the housing. Thus, the electromagnetic actuator A can be made compact.

According to a fifth feature of the present invention,
In addition to any one of the first to fourth features, a mounting boss used for screwing the housing to the support is formed on the side wall so as to protrude toward an inner surface thereof, and a protruding end of the mounting boss is provided. Since the escape holes capable of receiving the parts are provided on the opposite side walls of the coil cover, the coil cover can be mounted on the housing without being interfered by the mounting boss even in the first and second use modes. it can. Moreover, a screw hole whose effective length is sufficiently longer than the thickness of the housing can be formed in the mounting boss, and the screw can be firmly screwed to the support.

Further, according to a sixth aspect of the present invention,
In addition to any one of the first to fifth features, the coil cover includes a plunger cover for covering an outer periphery of an outer end of the movable plunger and a circular flange of the joint member connected to an outer end of the movable plunger. Since the stopper arm that regulates the outward movement of the joint member is integrally formed with the stopper member in any of the first and second usage modes,
The portion of the movable plunger that is exposed outside the housing is covered with a plunger cover integral with the coil cover to protect against intrusion of dust and contact with other objects, and to prevent the movable plunger from coming out with a stopper arm integral with the plunger cover. With a simple structure, the movable plunger is prevented from falling off during transportation or other handling of the electromagnetic actuator, and is easy to handle. Further, at this time, by making the flange of the joint member engaged with the stopper arm circular, the engagement between the flange and the stopper arm can be always performed reliably at any rotational position of the movable plunger.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional plan view of an electromagnetic actuator according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a view taken in the direction of arrow 3 in FIG. 1;

FIG. 4 is a view taken in the direction of arrow 4 in FIG. 1;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 1;

FIG. 6 is a perspective view of a housing of the electromagnetic actuator.

FIG. 7 is a perspective view of one end of a cover assembly of the electromagnetic actuator.

FIG. 8 is a perspective view of the cover assembly as viewed from the other end.

FIG. 9 is an explanatory view of an assembling process of the electromagnetic actuator.

[Explanation of symbols]

 A electromagnetic actuator 1 housing 1a 1st end wall 1b 2nd end wall 1c side wall 2 bobbin 3 .. Coil 5 ... Fixed core 6 ... Movable plunger 7 ... Cover assembly 7a ... Coil cover 7b ... Plunger cover 7c ... Section 24 Joint member 25 Return spring 31 Flange 34 Coupler terminal 35 Coupler 41 Positioning means (coupler holding section) 42・ Escape hole 43 ・ ・ ・ ・ ・ ・ Hollow part 45 ・ ・ ・ ・ ・ ・ Stopper arm

Claims (6)

[Claims] A first and a second end wall facing each other.
b) is disposed between the first and second end walls (1a, 1b) and a U-shaped housing (1) made of a magnetic material and integrally connected via a side wall (1c). Bobbin (2)
A coil (3) wound around the bobbin (2); a fixed core (5) surrounded by the bobbin (2) and fixed to the first end wall (1a); ) Is arranged to extend through the second end wall (1b) from the inside,
A movable plunger (6) attracted to the fixed core (5) by excitation of the coil (3), and a return spring (25) for urging the movable plunger (6) in a direction away from the fixed core (5). ) And the bobbin (2),
An electromagnetic actuator comprising: a coupler (35) having a coupler terminal (34) connected to the coil (3); and a coil cover (7a) mounted on the housing (1) to cover the coil (3). The cover (7a) is formed in a tubular shape to accommodate the bobbin (2) and the coil (3), and the coupler (3a) is provided on the coil cover (7a) at a predetermined position around its axis.
5) A first use mode in which a positioning means (41) for holding the coupler is provided and the coupler (35) is arranged on one side of the housing (1), and a second use mode in which the coupler (35) is arranged on the other side of the housing (1) An electromagnetic actuator characterized in that the coil cover (7a) is provided with two mounting positions with respect to the housing (1) so as to select a mode. 2. The electromagnetic actuator according to claim 1, wherein, as said positioning means, a coupler holding portion (41) fitted to a root of said coupler (35) is formed integrally with said coil cover (7a). Characterized by an electromagnetic actuator. 3. The electromagnetic actuator according to claim 1, wherein said coil cover has a hollow portion.
The fitting attachment part (1c) having 3) is integrally formed,
The second end wall (1) is inserted into the hollow portion (43) from one end thereof.
When the coupler (35) is fitted, the coupler (35) is in the first use mode. When the second end wall (1b) is fitted to the hollow portion (43) from the other end side, the coupler (35) is in the first use mode. An electromagnetic actuator according to a second mode of use. 4. The electromagnetic actuator according to claim 1, wherein said first end wall (1a) is formed narrower than said side wall (1c). An electromagnetic actuator, wherein the coupler (35) is selectively arranged adjacent to one side and the other side. 5. The electromagnetic actuator according to claim 1, wherein a mounting boss (9) used for screwing the housing (1) to a support (S) is attached to the side wall (1c). , And a clearance hole (42) for receiving the protruding end of the mounting boss (9) is provided on both opposing side walls of the coil cover (7a). Characterized by an electromagnetic actuator. 6. The electromagnetic actuator according to claim 1, wherein the coil cover (7a) has a plunger cover (7b) covering an outer periphery of an outer end of the movable plunger (6); A stopper arm (45) that engages with the circular flange (31) of the joint member (24) connected to the outer end of the plunger (6) to restrict outward movement of the joint member (24) is integrally formed. An electromagnetic actuator characterized by being molded.