JP3954804B2 - Electromagnetic actuator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a magnetic housing, a bobbin disposed in the housing, a coil wound around the bobbin, a fixed core surrounded by the bobbin and fixed to the housing, and the fixing by excitation of the coil. A movable plunger that is attracted to the core, a return spring that urges the movable plunger in a direction away from the fixed core, a joint member that is coupled to an outer end of the movable plunger that protrudes outside the housing, and the coil The present invention relates to an electromagnetic actuator including a coil cover that covers and is attached to the housing.
[0002]
[Prior art]
Such an electromagnetic actuator is already known as disclosed in, for example, JP-A-9-92528.
[0003]
[Problems to be solved by the invention]
In such conventional electromagnetic actuators, since there is no means for preventing the movable plunger from being detached, there is a possibility that the movable plunger may fall off during handling such as transportation in a non-connected state with the driven device.
[0004]
The present invention has been made in view of such circumstances, and an object thereof is to provide the electromagnetic actuator that can easily prevent the movable plunger from dropping off.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides a magnetic housing, a bobbin disposed in the housing, a coil wound around the bobbin, and a fixed core surrounded by the bobbin and fixed to the housing. A movable plunger that is attracted to the fixed core by excitation of the coil, a return spring that urges the movable plunger in a direction away from the fixed core, and an outer end portion of the movable plunger that protrudes out of the housing. And a coil cover that covers the coil and is attached to the housing. The plunger cover covers the outer periphery of the outer end of the movable plunger.TheMolded integrally to form a cover assemblyA stopper arm that is elastically deformable in the radial direction of the plunger cover and engages with the joint member in a free state to restrict outward movement of the member is constituted by a part of the peripheral wall of the plunger cover.This is the first feature.
[0006]
  According to the first feature, the cover assembly covers the coil and the movable plunger, and these can be protected from dust intrusion and contact with other objects, and the movable plunger can be prevented from coming out. The durability and handleability of the electromagnetic actuator can be improved. Moreover, the integral cover assembly does not increase the number of parts.Further, when the electromagnetic actuator is disassembled, the stopper arm can be detached from the joint member only by bending outward against the elastic force.
[0007]
According to the present invention, in addition to the first feature, the housing includes a first end wall supporting the fixed core, a second end wall penetrating the movable plunger, and the first and second end walls. A fitting attachment portion that is fitted to and attached to the second end wall and is integrally formed with the cover assembly. A second feature is that a retaining means for preventing the fitting attachment portion from being detached from the second end wall is provided between the fitting attachment portion and the housing.
[0008]
According to the second feature, the cover assembly can be easily attached to the housing using the second end wall of the housing.
[0009]
In addition to the second feature of the present invention, the bobbin flange is fitted to the inner periphery of the coil cover as the retaining means, and the inner side of the bobbin is adapted to guide the sliding of the movable plunger. A guide sleeve fitted to the periphery is inserted into the second end wall and the bobbin and fixed to the fixed core, and the guide sleeve and the bobbin prevent the fitting attachment portion from being detached from the second end wall. This is a third feature.
[0010]
According to the third feature, the bobbin is not only fixed to the housing by effectively using the fixed core and the guide sleeve, but also the detachment from the second end wall of the fitting attachment portion of the cover assembly is prevented. Therefore, since a special fixing member for preventing the fitting attachment portion from being detached from the second end wall is not required, the structure can be simplified and the assemblability can be improved.
[0011]
Furthermore, in the present invention, in addition to the second or third feature, a mounting boss used for screwing the support to the housing is formed on the side wall so as to protrude on the inner surface side. A fourth feature is that the coil cover is provided with an escape hole for receiving the protruding end.
[0012]
According to the fourth feature, a screw hole longer than the plate thickness of the housing can be formed in the mounting boss, and the screwing to the support body can be performed firmly. Moreover, since the protruding end portion of the mounting boss is received in the escape hole of the coil cover, the coil cover can be stacked on the side wall without being interfered by the mounting boss, which can contribute to the compactness of the electromagnetic actuator.
[0013]
Furthermore, the present invention is characterized in that, in addition to the fourth feature, the escape hole and the fitting attachment portion are formed in parallel to each other.
[0014]
According to the fifth feature, when the cover assembly is molded from a synthetic resin, the molding die can be easily molded with the same direction of the molding die with respect to the fitting attachment portion and the relief hole.
[0015]
Furthermore, in the present invention, in addition to any one of the first to fifth features, a coupler having a coupler terminal connected to the coil is connected to the end of the bobbin opposite to the joint member. Is a sixth feature.
[0016]
According to the sixth feature, the distance between the coupler and the joint member can be set large, and interference between the external lead wire connected to the coupler terminal and the joint member can be reliably prevented.
[0017]
Furthermore, in addition to the sixth feature, the seventh feature of the present invention is that a coupler holding portion fitted to the base of the coupler is formed integrally with the coil cover.
[0018]
According to the seventh feature, the coupler can be easily positioned and reinforced by the coupler holding portion integrated with the coil cover.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0020]
1 is a longitudinal plan view of an electromagnetic actuator according to the present invention, FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1, FIG. 3 is a view taken in the direction of arrow 3 in FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 1, FIG. 6 is a perspective view of the housing of the electromagnetic actuator, FIG. 7 is a perspective view as seen from one end side of the cover assembly of the electromagnetic actuator, and FIG. FIG. 9 is a perspective view seen from the other end of FIG. 9, and FIG. 9 is an explanatory view of the assembly process of the electromagnetic actuator.
[0021]
As shown in FIGS. 1 to 6, the electromagnetic actuator A 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 as main components.
[0022]
1 and 6, the housing 1 is formed by pressing one magnetic steel plate into a U-shape, and the first and second end walls 1a and 1b before and after facing each other and the side walls connecting them. In particular, both side edges of the first end wall 1a are closer to the inside than both side edges of the side wall 1c, and the lateral width of the first end wall 1a is set smaller than the lateral width of the side wall 1c. Positioning projections 8 and mounting bosses 9 are provided on the side wall 1c, and the electromagnetic actuator A is fixed to a fixed position of an appropriate support S by bolts 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. A large-diameter support hole 12 aligned with the small-diameter support hole 11 is formed in the second end wall 1b. The mounting boss 9 is formed so as to protrude to the inner surface side of the side wall 1c by burring from the outside of the side wall 1c. Therefore, the mounting boss 9 can be formed with a screw hole whose effective length is sufficiently longer than the thickness of the side wall 1c, and can be firmly screwed to the support S.
[0023]
2 and 3, the bobbin 2 is made of synthetic resin, and is connected to a cylinder 2c around which the coil 3 is wound, a thick flange 2a connected to one end of the cylinder 2c, and the other end of the cylinder 2c. It consists of a thin flange 2b. The inner diameter of the cylinder 2c is set to be substantially the same as that of the large-diameter support hole 12, and the distance between the outer surfaces of both flanges 2a, 2b is set to be substantially equal to the distance between the inner surfaces of both end walls 1a, 1b of the housing 1. The
[0024]
Coupled integrally with the thick flange 2a is a coupler housing 13 extending axially outward from the outer peripheral edge thereof. The coupler housing 13 is integrally formed with the bobbin 2. Therefore, when the bobbin 2 is inserted between the both end walls 1a and 1b of the housing 1, the thick flange 2a of the bobbin 2 is disposed on the inner surface of the first end wall 1a of the housing 1, and the thin flange 2b is disposed on the inner surface of the second end wall 1b. Adhering to each other, the movement of the bobbin 2 in the axial direction is prevented. At that time, the bobbin 2 is arranged so that the coupler housing 13 is 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).
[0025]
By the way, in the housing 1, as mentioned above, since the lateral width of the first end wall 1a is set smaller than the lateral width of the side wall 1c, one side or the other side of the first end wall 1a is reduced by the reduced lateral width. The amount of lateral protrusion of the coupler housing 13 that is disposed adjacent to the housing 1 from the housing 1 is reduced, and the electromagnetic actuator A can be made compact.
[0026]
A guide sleeve 4 made of nonmagnetic metal is fitted into the large-diameter support hole 12 of the cylindrical body 2c and the second end wall 1b of the bobbin 2, and a fixed core 5 and a movable plunger 6 are disposed in the guide sleeve 4. The movable plunger 6 can slide in the guide sleeve 4.
[0027]
The fixed core 5 has a cylindrical shape, and an annular groove 19 is formed on the outer periphery of one end portion, and a small shaft 20 is formed on one end surface thereof. Furthermore, the other end portion is provided with a tapered hole 21 that opens to the end surface, and a concave portion 22 that continues to the small-diameter end of the tapered hole 21. The fixed core 5 is tightly fitted to the inner peripheral surface of one end of the guide sleeve 4, and is raised from the inner peripheral surface of the sleeve 4 by caulking several portions of the sleeve 4 corresponding to the annular groove 19. Several caulking projections 23 are engaged with the annular groove 19. When such caulking is performed, 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 of both 4 and 5 can be secured. .
[0028]
The fixed core 5 is arranged so that the 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 enormous portion 20a is formed by caulking. In this way, the fixed core 5 is fixed to the first end wall 1 a of the housing 1. Therefore, the guide sleeve 4 is fixed to the housing 1 via the fixed core 5.
[0029]
The other end of the guide sleeve 4 is inserted into the large-diameter support hole 12 of the second end wall 1b of the housing 1 and protrudes outward from the second end wall 1b. By this protrusion, 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.
[0030]
The movable plunger 6 has a tapered shaft portion 6 a corresponding to the tapered hole 21 of the fixed core 5 at the inner end. A small shaft 32 having an enormous head portion 32a protrudes from the end surface of the tapered shaft portion 6a, and an elastic stopper 33 made of rubber or the like is attached to 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 restrict the proximity distance of the movable plunger 6 to the fixed core 5, and the contact impact is caused by the elastic stopper 33 itself. Absorbed by compressive deformation.
[0031]
A joint member 24 is attached to the outer end of the movable plunger 6 protruding from the guide sleeve 4. The joint member 24 is made of synthetic resin, and includes 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 portion of the movable plunger 6, The actuated member 26 is connected to the eyeball portion 24c. The cylindrical portion 24a is integrally formed with a plurality of lateral holes 27 and a locking claw 28 having a claw at the tip thereof bent inward in the radial direction facing the lateral hole 27. Is engaged with the annular groove 29 on the outer periphery of the movable plunger 6 with its own elastic force when the outer end surface of the movable plunger 6 press-fitted into the cylindrical portion 24a comes into contact with the end wall 24b. Therefore, even if loosening occurs in the press-fit connection between the cylindrical portion 24a and the movable plunger 6, it is possible to prevent the joint member 24 from being detached.
[0032]
Further, a tapered portion 30 and a circular flange 31 (see FIG. 5) rising from the large diameter end of the tapered portion 30 are formed on the outer peripheral surface of the cylindrical portion 24 a of the joint member 24. A return spring 25 made of a taper coil spring is contracted between the flange 31 and the second end wall 1b of the housing 1, and the movable plunger 6 is biased in a direction away from the fixed core 5 by the spring force. .
[0033]
Thus, when the coil 3 is energized and energized, the magnetic flux flowing through the housing 1 to the fixed core 5 and the movable plunger 6 generates an attractive force between the cores 5 and 6, and the movable plunger 6 is shown in FIG. The return spring 25 is compressed from the solid line position and moved forward toward the fixed core 5 to operate the actuated member 26.
[0034]
A pair of coupler terminals 34 connected to both ends of the coil 3 are mode-coupled from the thick flange 2a of the bobbin 2 to the coupler housing 13. A noise preventing diode 38 is connected between the coupler terminals 34, and a recess 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.
[0035]
The coupler housing 13 and the pair of coupler terminals 38 constitute a coupler 35, to which a power supply side coupler (not shown) is connected.
[0036]
The coupler 35 is connected to the end of the bobbin 2 opposite to the joint member 24, that is, the thick flange 2a. 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.
[0037]
A cover assembly 7 made of synthetic resin is attached to the housing 1 so as to cover 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.
[0038]
The cover assembly 7 includes a coil cover 7a that covers the entire outer peripheral surface of the coil 3, a plunger cover 7b that covers a portion of the movable plunger 6 that is exposed outside the housing 1, and a common cover that integrally couples the covers 7a and 7b. It is comprised from the fitting attachment part 7c.
[0039]
The coil cover 7 a has a rectangular tube shape with a rectangular cross section, and is disposed between the first and second end walls 1 a and 1 b of the housing 1 while covering the outer periphery of the coil 3. At that time, the long side of the rectangular cross section of the coil cover 7 a is arranged in parallel with the side wall 1 c of the housing 1. A positioning groove 40 having an arcuate cross section is formed in the inner surface of the opposing side wall on the long side of the coil cover 7a so as to engage a part of the outer peripheral surface of both flanges 2a, 2b of the bobbin 2.
[0040]
Further, on the opposite side of the plunger cover 7b, the coil cover 7a is integrally formed 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 side edge of the short side of the rectangular cross section. .
[0041]
Further, the coil cover 7a is provided with a pair of escape holes 42 on both side walls on the long side. These escape holes 42 are arranged so that the protruding end portions of the mounting bosses 9 of the side walls 1c can be received when the side walls on the long side are overlapped with the inner surface of the side wall 1c of the housing 1. Accordingly, both side walls on the long side of the coil cover 7a interfere with the mounting boss 9 so that the position of the coupler holding portion 41 can be selected on either the left side or the right side of the first end wall 1a of the housing 1. It is possible to overlap the inner surface of the side wall 1c of the housing 1 without being done. Thus, only by changing the mounting position of the coil cover 7a with respect to the housing 1, the first usage mode in which the coupler 35 is disposed on one side of the housing 1 and the second usage mode in which the coupler 35 is disposed on the other side can be selected. Therefore, two types of electromagnetic actuators A having different positions of the coupler 35 can be provided at low cost without increasing the number of parts.
[0042]
Each escape hole 42 and the fitting attachment portion 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 molded with the same direction of pulling the molding die with respect to the fitting attachment portion 7c and each escape hole 42.
[0043]
On the other hand, the plunger cover 7b has a cylindrical shape and is disposed so as to cover a portion of the movable plunger 6 exposed outside the housing 1. The fitting attachment portion 7c has a hollow portion 43 open at both ends corresponding to the cross-sectional shape of the second end wall 1b of the housing 1, and the second end wall 1b is fitted into the hollow portion 43. .
[0044]
The plunger cover 7b includes a stopper arm 45 that engages with the flange 31 of the joint member 24 and prevents the movable plunger 6 from being detached from the guide sleeve 4 by a part of the peripheral wall of the cover 7b. At that time, a pair of slits 46 adjacent to both sides of the stopper arm 45 are cut into the plunger cover 7b from the outer end side of the plunger cover 7b. Thereby, each stopper arm 45 is given elasticity in the radial direction of the plunger cover 7b. Further, the cutting depth of the slit 46 determines the effective length of the stopper arm 45.
[0045]
The stopper arms 45 are provided at two locations opposed to the plunger cover 7b on the diameter line, and at the tips thereof, inward hooks 47 that can be engaged with the outer end surfaces of the flanges 31 in the free state of the stopper arms 45. Are integrally formed. A slope 47 a is formed at the outer end of the hook 47. When the joint member 24 is inserted into the plunger cover 7b, the inclined surface 47a is pushed away by the flange 31 to bend the stopper arm 45 outward in the radial direction.
[0046]
Thus, in assembling the electromagnetic actuator A, as shown in FIG. 9A, the bobbin 2 with the coil 3 is inserted into the coil cover 7a of the cover assembly 7, and the base of the coupler housing 13 is placed at the base. The coupler holding part 41 is fitted. At that time, both the flanges 2a and 2b of the bobbin 2 are engaged with the positioning grooves 40 on the inner wall of the coil cover 7a, so that the bobbin 2 and the coil cover 7a are concentric. 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 easily and reliably.
[0047]
Next, as shown in FIG. 9B, the second end wall 1 b of the housing 1 is fitted into the fitting attachment portion 7 c of the cover assembly 7. At that time, depending on which side of the two openings of the fitting attachment portion 7c is fitted to the second end wall 1b, the coupler housing 13 is placed on the upper side (solid line position) or the lower side of the housing 1 as shown in FIG. Place it at the chain line position.
[0048]
Subsequently, as shown in FIG. 9C, the guide sleeve 4 that is caulked and joined 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 small size of the fixed core 5 is reduced. The shaft 20 is fitted into the small diameter support hole 11 of the housing 1. Then, as shown in FIG. 9D, the outer end of the small shaft 20 is caulked to form the enormous portion 20a. In this way, the fixed core 5 and the guide sleeve 4 are fixed to the housing 1. As a result, the bobbin 2 is prevented from detaching from the first and second end walls 1a and 1b and from the fitting end 7c of the cover assembly 7 from the second end wall 1b. Therefore, since a special fixing member for preventing the fitting attachment portion 7c from being detached from the second end wall 1b is not necessary, the structure can be simplified and the assembling property can be improved.
[0049]
Finally, as shown in FIG. 2, the movable plunger 6 fitted with the return spring 25 and 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 inclined surfaces 47a of the pair of stopper arms 45 of the plunger cover 7b, so that the hooks 47 are moved outward while the stopper arms 45 are bent. As a result, the flange 31 can pass smoothly in front of the hook 47. After the passage, if the pushing force is released from the movable plunger 6, the movable plunger 6 is retracted by the return force of the return spring 25, but the outer end surface of the flange 31 of the joint member 24 is engaged with the hooks 47 of both stopper arms 45. As a result, the movable plunger 6 is prevented from coming off from the guide sleeve 4.
[0050]
Thus, the coil 3 and the plunger 6 are respectively covered by the coil cover 7a and the plunger cover 7b constituting the integral cover assembly 7, and are protected from dust intrusion and contact with other objects. Moreover, the plunger cover 7b can be used to easily prevent the movable plunger 6 from coming out of the guide sleeve 4. Therefore, the movable plunger 6 does not fall off during the transportation or other handling of the electromagnetic actuator A, and the handling becomes easy.
[0051]
Further, at the time of assembly, the flange 31 can be engaged with the hooks 47 of the both stopper arms 45 by simply inserting the joint member 24 into the plunger cover 7b. In addition, since the flange 31 is circular, the flange 31 of the joint member 24 and the hook 47 of the stopper arm 45 can always be reliably engaged at any rotational position of the movable plunger 6, and the assemblability is extremely high. It becomes good. Further, when the electromagnetic actuator A is disassembled, each hook 47 is detached from the flange 31 of the joint member 24 only by bending both stopper arms 45 outward against the elastic force, and the movable plunger 6 is guided by the guide sleeve. It can be pulled out from 4, and maintainability is also good.
[0052]
Further, since the hooks 47 of the stopper arms 45 engage with both opposite sides of the flange 31 in the diameter line shape, a stable engagement state with the flange 31 can always be obtained.
[0053]
Furthermore, the flange 31 of the joint member 24 has two different functions of supporting the movable end of the return spring 25 on its inner surface and engaging the hook 47 of the stopper arm 45 on its outer surface. This can contribute to simplification and compactness of the structure.
[0054]
The present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist thereof. For example, the fixed core and the guide sleeve can be joined by welding, brazing or the like instead of caulking.
[0055]
【The invention's effect】
  As described above, according to the first feature of the present invention,CoPlunger cover that covers the outer periphery of the movable plungerTheMolded integrally to form a cover assemblyA stopper arm that is elastically deformable in the radial direction of the plunger cover and engages with the joint member in a free state to restrict the outward movement of the member is constituted by a part of the peripheral wall of the plunger cover.Therefore, the cover assembly can cover the coil and the movable plunger and protect them from dust intrusion and contact with other objects, and can prevent the movable plunger from coming out of the guide sleeve. Durability and handleability can be improved. Moreover, the integral cover assembly does not increase the number of parts.Further, when the electromagnetic actuator is disassembled, the stopper arm can be detached from the joint member only by bending outward against the elastic force.
[0056]
According to a second feature of the present invention, in addition to the first feature, the housing includes a first end wall supporting the fixed core, a second end wall penetrating the movable plunger, and The cover assembly includes a fitting attachment portion configured to be fitted to and attached to the second end wall, with a side wall disposed on one side of the coil so as to connect the first and second end walls. Since the molding means is integrally formed and a retaining means for preventing the fitting attachment portion from being detached from the second end wall is provided between the fitting attachment portion and the housing, the housing is provided using the second end wall of the housing. It is possible to easily attach the cover assembly.
[0057]
Furthermore, according to the third feature of the present invention, in addition to the second feature, the bobbin flange is fitted to the inner periphery of the coil cover as the retaining means, and the movable plunger is slid. A guide sleeve fitted to the inner periphery of the bobbin to be guided is inserted into the second end wall and the bobbin and fixed to the fixed core, and the second end of the fitting mounting portion is fixed by the guide sleeve and the bobbin. Since the separation from the wall is prevented, the bobbin is not only fixed to the housing by effectively using the fixed core and the guide sleeve, but also from the second end wall of the fitting attachment portion of the cover assembly. Therefore, since a special fixing member for preventing the fitting attachment portion from being detached from the second end wall is unnecessary, the structure can be simplified and the assemblability can be improved.
[0058]
Furthermore, according to the fourth feature of the present invention, in addition to the second or third feature, a mounting boss used for screwing the support to the housing is formed on the side wall so as to protrude to the inner surface side. On the other hand, since the coil cover is provided with a clearance hole for receiving the protruding end of the mounting boss, a screw hole longer than the plate thickness of the housing can be formed in the mounting boss, and screwing to the support can be prevented. It can be done firmly. Moreover, since the protruding end portion of the mounting boss is received in the escape hole of the coil cover, the coil cover can be stacked on the side wall without being interfered by the mounting boss, which can contribute to the compactness of the electromagnetic actuator.
[0059]
Furthermore, according to the fifth feature of the present invention, in addition to the fourth feature, since the escape hole and the fitting attachment portion are formed in parallel with each other, when the cover assembly is molded with synthetic resin, The molding can be easily performed with the same direction of the molding die with respect to the fitting portion and the relief hole.
[0060]
Furthermore, according to the sixth aspect of the present invention, in addition to any one of the first to fifth characteristics, a coupler terminal connected to the coil is provided at the end of the bobbin opposite to the joint member. Since the coupler provided is continuously provided, the distance between the coupler and the joint member can be set large, and interference between the external lead wire connected to the coupler terminal and the joint member can be surely prevented.
[0061]
Furthermore, according to the seventh feature of the present invention, in addition to the sixth feature, since the coupler holding portion fitted to the base of the coupler is formed integrally with the coil cover, the coupler holding unit integrated with the coil cover is provided. This makes it easy to position and reinforce the coupler.
[Brief description of the drawings]
FIG. 1 is a longitudinal plan view of an electromagnetic actuator according to the present invention.
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;
4 is a view taken in the direction of arrow 4 in FIG. 1;
5 is a cross-sectional view taken along line 5-5 of FIG.
FIG. 6 is a perspective view of a housing of the electromagnetic actuator.
FIG. 7 is a perspective view seen from one end side of the cover assembly of the electromagnetic actuator.
FIG. 8 is a perspective view seen from the other end side of the cover assembly.
FIG. 9 is an explanatory diagram of an assembly process of the electromagnetic actuator.
[Explanation of symbols]
A ... Electromagnetic actuator
1 ... Housing
1a... First end wall
1b... Second end wall
1c ... sidewall
2 ... Bobbins
2a, 2b ... Bobbin flange
3. Coil
5 ... Fixed core
6 ... Moveable plunger
7: Cover assembly
7a ... Coil cover
7b ... Plunger cover
7c ・ ・ ・ ・ Fitting mounting part
9 ... Mounting boss
24 ··· Joint members
25..Return spring
34 ··· Coupler terminal
35 ... Coupler
41... Coupler holding part
42..
45 ... Stopper arm

Claims (7)

Magnetic housing (1), bobbin (2) disposed in the housing (1), coil (3) wound around the bobbin (2), and the housing surrounded by the bobbin (2) A fixed core (5) fixed to (1), a movable plunger (6) adsorbed to the fixed core (5) by excitation of the coil (3), and this movable plunger (6) is connected to the fixed core (5) A return spring (25) urging in a direction away from the joint, a joint member (24) coupled to an outer end of the movable plunger (6) projecting out of the housing (1), and the coil (3). In an electromagnetic actuator comprising a coil cover (7a) that covers and is attached to the housing (1),
A plunger cover (7b) that covers the outer periphery of the outer end of the movable plunger (6) is formed integrally with the coil cover (7a) to form a cover assembly (7) .
A stopper arm (45) that is elastically deformable in the radial direction of the plunger cover (7b) and engages with the joint member (24) in a free state to restrict outward movement of the member (24), An electromagnetic actuator comprising a part of the peripheral wall of the plunger cover (7b) . The electromagnetic actuator according to claim 1,
The housing (1) includes a first end wall (1a) supporting the fixed core (5), a second end wall (1b) penetrating the movable plunger (6), and the first and second A fitting which is constituted by a side wall (1c) arranged on one side of the coil (3) so as to connect between the end walls (1a, 1b) and is fitted to the second end wall (1b). A joint attachment portion (7c) is formed integrally with the cover assembly (7), and the second end wall (1b) of the fitting attachment portion (7c) is formed between the fitting attachment portion (7c) and the housing (1). An electromagnetic actuator characterized in that a retaining means for preventing separation from the magnetic actuator is provided. The electromagnetic actuator according to claim 2,
As the retaining means, the bobbins (2a, 2b) are fitted into the inner periphery of the coil cover (7a), and the bobbin (6) is guided to slide the movable plunger (6). 2) The guide sleeve (4) fitted to the inner periphery of the second end wall (1b) and the bobbin (2) is fitted and fixed to the fixed core (5), and the guide sleeve (4) An electromagnetic actuator characterized in that the bobbin (2) prevents the fitting attachment portion (7c) from being detached from the second end wall (1b). The electromagnetic actuator according to any one of claims 2 and 3,
An attachment boss (9) used for screwing the housing (1) to the support (S) is formed on the side wall (1c) so as to protrude to the inner surface side, while the attachment boss (9) An electromagnetic actuator characterized in that a relief hole (42) for receiving the protruding end portion is provided in the coil cover (7a). The electromagnetic actuator according to claim 4, wherein
The electromagnetic actuator, wherein the escape hole (42) and the fitting attachment portion (7c) are formed in parallel to each other. In the electromagnetic actuator in any one of Claims 1-5,
A coupler (35) including a coupler terminal (34) connected to the coil (3) is connected to the end of the bobbin (2) opposite to the joint member (24). Electromagnetic actuator. The electromagnetic actuator according to claim 6, wherein
An electromagnetic actuator characterized in that a coupler holding portion (41) fitted to the base of the coupler (35) is formed integrally with the coil cover (7a).

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