JP2014075962A - Electromagnetic actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic actuator whose holder can easily be manufactured and which can prevent cracking of a fixing part in the process of assembly.SOLUTION: A terminal unit 20 is provided with: a holder 25; a pin-shaped terminal 27 inserted in a through hole 26 of the holder 25; a fixing part 28 which is fixed to an outer peripheral part of the pin-shaped terminal and fixed to the through hole 26; and a cylindrical terminal 29 fixed to the holder 25. The holder 25 has an inner cylinder part 31 and an outer cylinder part 30 provided outside the same. The through hole 26 is composed of the inner cylindrical part 31. The fixing part 28 is inserted in the through hole 26 and fixed, and an inner diameter side of the outer cylinder part 30 is pressed in an outer diameter side of the cylindrical terminal 29, so that the holder is fixed to the cylindrical terminal 29. Therefore, pressure by press-in does not operate in the fixed part 28 during assembly. Thus, cracking of the fixing part 28 caused by press-in can be prevented. Also, since the holder 25 can be formed by press molding, it can be easily manufactured.

Description

  The present invention relates to an electromagnetic actuator that is operated by a thermoelectromotive force of a thermocouple or an external power source such as a dry battery, for example, an electromagnetic valve unit used as a part of a gas extinguishing safety device such as a gas stove or a gas water heater. It relates to an actuator.

The thing of patent document 1 is known as an example of the electromagnetic actuator used for the solenoid valve unit etc. which make a part of said gas extinguishing safety device.
The electromagnetic actuator is operated by an external power source such as a dry battery. As shown in FIGS. 9A and 9B, the electromagnetic actuator body 1 and a terminal unit 2 attached to the electromagnetic actuator body 1 are provided. I have.

The terminal unit 2 is inserted into a holder 5 to which the coil portion 3 of the electromagnetic actuator body 1 is attached, and a through hole 6 formed in the holder 5, and a terminal 3 c extending from the coil complete 3 a of the coil portion 3 is inserted. A cylindrical pin-shaped terminal 7, a fixed portion 8 fixed to the outer periphery of the pin-shaped terminal 7 and fixed to the through-hole 6, and a periphery of the pin-shaped terminal 7 protruding from the through-hole 6 A cylindrical terminal 9 is provided and fixed to the holder 5.
The electromagnetic actuator body 1 includes a fixed iron core 3b, an exciting coil complete 3a extrapolated to the fixed iron core 3b, and a movable iron core 1b that is attracted to the fixed iron core 3b by energization of the coil complete 3a and is movable in the axial direction. And a return spring 1e for urging the movable iron core 1b away from the fixed iron core 3b, and a body 1d for containing the fixed iron core 3b and movably containing the movable iron core 1b. A shaft 1g is attached to the movable iron core 1b, and a valve body 1f is attached to the tip of the shaft 1g.

The fixing portion 8 includes a packing 8a that holds the pin-shaped terminal 7 at the center of the holder 5, and a sealing member 8b that is pressed against the packing 8a to form a gas sealing function. The packing 8a and the sealing member 8b Is press-fitted into the through-hole 6.
The packing 8a is formed in a substantially cylindrical shape by an electrically insulating resin material, and the seal member 8b is formed by a rubber material.

  When assembling the terminal unit 2, the terminal 3 c extending from the coil complete 3 a is passed through the pin-shaped terminal 7, and the packing 8 a integrally molded with the pin-shaped terminal 7 and the seal member 8 b are connected to the through hole 6 of the holder 5. Then, the holder 5 is press-fitted into the inner diameter side of the cylindrical terminal 9 and fitted.

JP 2005-110385 A

By the way, in the conventional electromagnetic actuator, when assembling the terminal unit 2, the resin packing 8 a constituting the fixing portion 8 is press-fitted into the through hole 6 of the holder 5, so it is necessary to finish the through hole 6 with high accuracy. For this reason, the holder 5 is manufactured by cutting a brass or aluminum material. For this reason, it takes time to manufacture the holder 5, and chips are produced in the manufacturing process, so that the material is also wasted, resulting in high costs.
Further, the packing 8 a of the fixing portion 8 may be cracked due to the pressure when the fixing portion 8 is press-fitted into the through hole 6 of the holder 5.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic actuator capable of easily manufacturing a holder and preventing cracking of a fixing portion during assembly.

In order to achieve the above object, the present invention is an electromagnetic actuator operated by a thermoelectromotive force of a thermocouple or an external power source such as a dry cell,
An electromagnetic actuator body and a terminal unit attached to the electromagnetic actuator body;
The terminal unit is
A holder to which a coil portion of the electromagnetic actuator body is attached;
A pin-like terminal that is inserted into a through-hole formed in the holder and into which an end portion of the coil of the coil portion is inserted,
A fixed portion fixed to the outer peripheral portion of the pin-shaped terminal and fixed to the through hole;
A cylindrical tubular terminal provided around the pin-shaped terminal protruding from the through hole and fixed to the holder;
The holder has an inner cylinder part and an outer cylinder part provided coaxially on the outer side of the inner cylinder part,
The through hole is constituted by the inner cylinder portion,
The fixing portion is inserted and fixed in the through hole,
The cylindrical terminal is fixed to the holder by press-fitting the inner diameter side of the outer cylinder portion into the outer diameter side of the cylindrical terminal.

In the present invention, the cylindrical terminal is fixed to the holder by press-fitting the inner-diameter side of the outer cylindrical portion to the outer-diameter side of the cylindrical terminal, so that the pressure due to the press-fitting acts on the inner cylindrical portion. do not do. For this reason, since the said pressure does not act on the fixing | fixed part fixed to the said through-hole comprised by the said inner cylinder part during an assembly, the crack of the fixing | fixed part resulting from press injection can be prevented.
Also, a fixed part is fixed to the outer peripheral part of the pin-shaped terminal, and this fixed part is inserted and fixed in the through hole (inner cylinder part), and the inner diameter side of the outer cylinder part coaxial with the inner cylinder part is cylindrical. Since the cylindrical terminal is fixed to the holder by being press-fitted to the outer diameter side of the terminal, the axial and radial positioning of the pin-shaped terminal fixed to the fixing portion and the cylindrical terminal is easy. Can be performed accurately.
Further, since it is not fixed by press fitting as in the prior art, it is not necessary to finish the through hole of the holder for fixing the fixing portion with high accuracy. For this reason, since a holder can be formed by press molding, a holder can be manufactured easily.
Furthermore, since the cylindrical terminal is fixed to the holder by press-fitting the inner diameter side of the outer cylindrical portion of the holder into the outer diameter side of the cylindrical terminal, the cylindrical terminal can be easily and reliably fixed to the holder. .

The said structure of this invention WHEREIN: You may fix the said fixing | fixed part to the said through-hole by crimping the said inner cylinder part from the outer peripheral side.
According to such a structure, a fixing | fixed part can be fixed easily and reliably by crimping by the punch etc. from the outer peripheral side of an inner cylinder part.

Further, in the configuration of the present invention, an uneven portion is continuously formed along the circumferential direction on the outer peripheral portion of the fixed portion, and the inner cylinder portion is caulked from the outer peripheral side at a position facing the concave portion of the uneven portion. May be.
Moreover, the uneven part may have a spline shape.

  According to such a configuration, since the inner cylinder portion is crimped from the outer peripheral side at a position facing the concave portion of the concavo-convex portion of the fixed portion, a part of the outer peripheral wall of the inner cylindrical portion engages with the concave portion. Therefore, the fixing portion can be reliably fixed to the through hole so as not to move in the axial direction and the circumferential direction.

  The said structure of this invention WHEREIN: It is preferable that a recessed part is formed in the upper end part of the said inner cylinder part of the said holder, and at least one part of the said coil part is mounted | worn in this recessed part.

  According to such a configuration, since at least a part of the coil portion is mounted in the concave portion of the holder, the coil portion can be positioned and provided stably.

  Further, in the above configuration of the present invention, the fixing portion is rotated by a predetermined angle around the axis of the pin-shaped terminal, and is engaged with an engaging portion formed in the through hole so as not to move in the axial direction. May be fixed to the through hole.

According to such a configuration, the fixed portion fixed to the outer peripheral portion of the pin-shaped terminal is rotated by a predetermined angle around the axis of the pin-shaped terminal, and the engagement portion formed in the through hole is axially moved. By being engaged so as to be immovable, it is fixed to the through-hole and is not fixed by press-fitting into the through-hole as in the prior art, so that pressure due to press-fitting does not act on the fixed part during assembly.
Therefore, it is possible to prevent the fixing portion from being cracked due to the press-fitting.

Further, in the above configuration of the present invention, the engaging portion is an inner flange that protrudes inward from the inner peripheral surface of the through-hole, and an irregularly shaped hole other than a circle is formed in the center portion,
The fixed portion is formed to have a larger diameter than the deformed hole and cannot be inserted through the deformed hole, and can pass through the deformed hole and pass through the deformed hole. It is good also as a structure which has a small diameter part which contact | connects the said peripheral part so that it may pinch | interpose the said peripheral part with the said large diameter part by rotating only a predetermined angle around an axis | shaft.

  According to such a configuration, the fixing portion can be easily and reliably fixed to the through hole by sandwiching the peripheral portion of the irregularly shaped hole formed in the inner flange by the large diameter portion and the small diameter portion of the fixing portion.

  In the configuration of the present invention, the irregular hole may be any one of an oval hole, a rectangular hole, an oblong hole, an elliptical hole, and a D-cut hole.

  According to such a configuration, the irregular hole can be easily formed in the inner flange.

  In the configuration of the present invention, it is preferable that the holder is formed by press molding.

  According to such a configuration, since the holder is formed by press molding, the holder can be easily manufactured.

According to the present invention, the cylindrical terminal is fixed to the holder by press-fitting the inner-diameter side of the outer cylinder part to the outer-diameter side of the cylindrical terminal, so that the pressure due to the press-fitting is applied to the inner cylinder part. Does not work. For this reason, since the said pressure does not act on the fixing | fixed part fixed to the said through-hole comprised by the said inner cylinder part during an assembly, the crack of the fixing | fixed part resulting from press injection can be prevented.
Further, since it is not fixed by press fitting as in the prior art, it is not necessary to finish the through hole of the holder for fixing the fixing portion with high accuracy. For this reason, since a holder can be formed by press molding, a holder can be manufactured easily.

1 is a sectional view showing an actuator according to a first embodiment of the present invention. FIG. The holder which comprises the actuator which concerns on the 1st Embodiment of this invention is shown, (a) is the perspective view seen from diagonally upward, (b) is the perspective view seen from diagonally downward, (c) is a cross section. FIG. The pin-shaped terminal and fixed part which comprise the actuator which concerns on the 1st Embodiment of this invention are shown, (a) is a perspective view, (b) is sectional drawing. The cylindrical terminal which comprises the actuator which concerns on the 1st Embodiment of this invention is shown, (a) is the perspective view seen from diagonally upward, (b) is the perspective view seen from diagonally downward, (c). Is a cross-sectional view. The actuator which concerns on the 2nd Embodiment of this invention is shown, and it is sectional drawing. It is an expanded sectional view of the holder with which the fixing | fixed part and the pin-shaped terminal were mounted | mounted. FIG. 2 shows a pin-like terminal with a fixed portion fixed, where (a) is a front view, (b) is a plan view, (c) is a bottom view, and (d) is a cross-sectional view. An example of the conventional actuator is shown, (a) is sectional drawing, (b) is quiet.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a sectional view showing an electromagnetic actuator according to a first embodiment of the present invention, and FIG. 2 is a perspective view thereof.
This electromagnetic actuator is used for an electromagnetic valve unit or the like that forms part of a gas extinguishing safety device such as a gas stove or a gas water heater, and is operated by an external power source such as a dry battery (not shown). Thus, the electromagnetic actuator main body 1 and the terminal unit 20 attached to the electromagnetic actuator main body 1 are provided.
The external power source such as the dry battery is mounted on the control board side and is separated from the electromagnetic actuator. And the thermocouple is used as a temperature sensor (no role to supply electric power to the electromagnetic actuator), the fire of the stove is extinguished and the decrease in the thermocouple output (thermoelectromotive force) is detected, and the dry battery on the substrate side The output is turned off and the valve (solenoid valve) is closed by the electromagnetic actuator.
Also, at the time of ignition, an ignition operation (igniter ON) is used to send dry battery output to the solenoid valve to open (suction) it. If the thermocouple output does not increase due to poor ignition, the valve is closed.

The terminal unit 20 is inserted into a holder 25 to which the coil portion 3 of the electromagnetic actuator main body 1 is attached, and a through hole 26 formed in the holder 25, and a terminal 3 c extending from the coil complete 3 a of the coil portion 3 is inserted. A cylindrical pin-shaped terminal 27, a fixed portion 28 fixed to the outer periphery of the pin-shaped terminal 27 and fixed to the through-hole 26, and a periphery of the pin-shaped terminal 27 protruding from the through-hole 26 are surrounded. A cylindrical terminal 29 is provided and fixed to the holder 25. The cylindrical terminal 29 and the pin-shaped terminal 27 are connected to a thermocouple unit having a thermocouple (not shown).
The configuration of the electromagnetic actuator body 1 is the same as that of the conventional electromagnetic actuator body 1 shown in FIG.

The holder 25 is formed by press-molding a thin disk-shaped disk made of a conductive metal material. As shown in FIGS. 3A to 3C, the holder 25 and The outer cylinder part 30 has an inner cylinder part 31 provided at a predetermined interval from the outer cylinder part 30.
The outer cylinder part 30 is formed in a substantially cylindrical shape, and is constituted by a large diameter part 30a, a small diameter part 30b coaxial with the large diameter part 30a, and an annular flange part 30c connecting them. Further, four notches 30d are formed at equal intervals in the circumferential direction at the upper edge of the small diameter portion 30b.

The inner cylinder part 31 is formed in a substantially cylindrical shape, and is constituted by a large diameter part 31a, a small diameter part 31b coaxial with the large diameter part 31a, and an annular flange part 31c connecting them.
The upper edge part of the large diameter part 31a of the inner cylinder part 31 and the upper edge part of the small diameter part 30b of the outer cylinder part 30 are continuous, whereby the outer cylinder part 30 and the inner cylinder part 31 are integrally formed. Is formed.

A circular recess 32 is formed by the inner peripheral surface of the large-diameter portion 31a of the inner cylinder portion 31 and the upper surface of the flange portion 31c, and the fixed iron core 3b constituting the coil portion 3 is formed in the recess 32. The coil complete 3a which comprises the coil part 3 is extrapolated to this fixed iron core 3b. The coil complete 3a is obtained by winding a coil around a resin bobbin, and the fixed iron core 3b slightly protrudes from the upper end of the coil complete 3a.
The terminal 3c extending from the coil complete 3a passes through the fixed iron core 3b and is inserted into the cylindrical pin-shaped terminal 27 up to its tip, and both are welded and electrically joined at the tip.

Further, as shown in FIGS. 3B and 3C, the small diameter portion 31 b of the inner cylinder portion 31 extends downward from the flange portion 31 c, and its lower end protrudes downward from the lower end of the outer cylinder portion 30. Yes. And this small diameter part 31b comprises the through-hole 26 formed in the said holder 25. As shown in FIG.
An engaging portion 35 is formed on the inner peripheral surface of the lower end portion of the through hole 26 (small diameter portion 31b). The engaging portion 35 is configured by an inner flange 35a that protrudes inward from the inner peripheral surface of the lower end portion of the through hole 26 and has a deformed hole 35b having a deformed shape other than a circle at the center. The deformed hole 35b is an oval hole, but may be a rectangular hole, an oval hole, an elliptical hole, or a D-cut hole.

As shown in FIGS. 4A and 4B, the fixing portion 28 is formed in a substantially cylindrical shape by an electrically insulating resin material, and has a large diameter portion 28a and a small diameter portion 28b. ing.
The large-diameter portion 28a is a cylindrical member having a larger diameter than the modified hole 35b, and has an outer diameter larger than the maximum diameter of the modified hole 35b. Therefore, the large-diameter portion 28a cannot be inserted through the deformed hole 35b, and is inserted into the through hole 26 and then comes into contact with the inner flange 35a around the deformed hole 35b (see FIG. 1). The outer diameter of the large diameter portion 28a is substantially equal to or slightly smaller than the inner diameter of the through hole 26, so that the large diameter portion 28a can be accommodated in the through hole 26 with almost no gap (radial gap). It is like that.

  The small diameter portion 28b is formed in an oval shape with a predetermined gap from the large diameter portion 28a. This predetermined interval is substantially equal to or slightly larger than the thickness of the inner flange 35a. The small-diameter portion 28b is substantially the same shape as the deformed hole 35b and is formed to be slightly smaller. By combining the outer shape of the small-diameter portion 28b and the outer shape of the deformed hole 35b, the small-diameter portion 28b can be inserted into the deformed hole 35b. It has become. Further, an annular groove 28c having the same width as the predetermined interval is formed between the large diameter part 28a and the small diameter part 28b, and the inner peripheral edge of the inner flange 35a is engaged with the groove 28c. It has become.

  The fixed portion 28 having the above-described configuration has a central hole formed along the axis at the center and opened at the upper and lower end surfaces, and the pin-like terminal 27 is inserted and fixed in the central hole. The fixing portion 28 is molded integrally with the pin-shaped terminal 27 so that the pin-shaped terminal 27 is disposed in the center hole. A convex portion 27a is formed along the circumferential direction on the outer peripheral portion of the pin-shaped terminal 27, and a concave portion 28d fitted to the convex portion 27a is formed along the circumferential direction on the inner peripheral surface of the large-diameter portion 28a. Has been. By fitting the convex portion 27a into the concave portion 28d, the fixing portion 28 is fixed to the outer peripheral portion of the pin-shaped terminal 27 so as not to be pulled out.

In order to attach the pin-shaped terminal 27 having the fixing portion 28 to the holder 25, as shown in FIG. 1, the tip end of the pin-shaped terminal 27 is inserted into the inner cylinder portion 31 from below and fixed. The portion 28 is inserted into the through hole 26, the lower surface of the large diameter portion 28 a of the fixing portion 28 is brought into contact with the inner flange 35 a of the engaging portion 35, and the small diameter portion 28 b is inserted through the deformed hole 35 b and passed therethrough.
At this time, if the outer shape of the small-diameter portion 28b matches the outer shape of the deformed hole 35b, the small-diameter portion 28b is inserted into and passes through the deformed hole 35b in the state as it is. At the same time, by rotating the fixing portion 28 about the axis, the small diameter portion 28b rotates about the axis and matches the deformed hole 35b. Then, the small diameter portion 28b may be inserted into the deformed hole 35b and passed therethrough.

After the small-diameter portion 28b passes through the deformed hole 35b, the fixing portion 28 is rotated around the axis together with the pin-shaped terminal 27, and the small-diameter portion 28b is rotated by a predetermined angle (for example, 90 °). As a result, both end portions in the long side direction of the small diameter portion 28b overlap with the edge portion on the short side of the deformed hole 35b, and the edge portion of the inner flange 35a engages with a part of the groove 28c.
As a result, the peripheral portion of the deformed hole 35b can be sandwiched between the large-diameter portion 28a and the small-diameter portion 28b of the fixing portion 28, so that the fixing portion 28 is easily and reliably prevented from coming off the through-hole 26. It can be fixed with.

In this way, the holder 25 to which the pin-shaped terminal 27 having the fixing portion 28 is attached is fixed to the cylindrical terminal 29.
An O-ring 36 as a seal member is attached to the upper end portion of the pin-shaped terminal 27, and this O-ring 36 is inside the through-hole 26 in a state where the fixing portion 28 is fixed to the through-hole 26. Close to the surface.

The cylindrical terminal 29 is formed in a cylindrical shape by molding (deep drawing) a conductive material such as a metal plate having a predetermined plate thickness. The cylindrical terminal 29 is connected to a female terminal of a thermocouple unit (not shown) and functions as a connector coupled to the connector of the thermocouple unit.
Further, as shown in FIGS. 5A to 5C, the cylindrical terminal 29 has two flange portions 29a and 29a extending radially outward and spaced apart from each other at the upper end portion thereof. Have. Further, the cylindrical terminal 29 has two wall portions 29b and 29b which are formed in a circular arc plate shape and spaced apart in the radial direction at the upper end portion thereof and portions other than the flange portions 29a and 29a.
The wall portion 29b has an outer peripheral surface having substantially the same curvature as the outer periphery of the cylindrical terminal 29, projects slightly outward from the cylindrical terminal 29, and projects upward from the flange portion 29a.
As shown in FIG. 1, the inner diameter side of the large diameter portion 30 a of the outer cylinder portion 30 is press-fitted into the outer diameter side of the wall portions 29 b and 29 b at the upper end portion of the cylindrical terminal 29. A cylindrical terminal 29 is fixed.

As described above, according to the present embodiment, the cylindrical terminal 29 is fixed to the holder 25 by press-fitting the inner diameter side of the outer cylindrical portion 30 into the outer diameter side of the wall portion 29 b of the cylindrical terminal 29. Therefore, the pressure due to the press-fitting does not act on the inner cylinder portion 31. For this reason, since the said pressure does not act on the fixing | fixed part 28 fixed to the through-hole 26 comprised by the said inner cylinder part 31 during an assembly, the crack of the fixing | fixed part 28 resulting from press injection can be prevented.
A fixed portion 28 is fixed to the outer peripheral portion of the pin-shaped terminal 27, and the fixed portion 28 is fixed to the through hole (inner cylinder portion 31) 26 so as not to move in the axial direction, and is coaxial with the inner cylinder portion 31. Since the cylindrical terminal 29 is fixed to the holder 25 by press-fitting the inner diameter side of the outer cylindrical portion 30 to the outer diameter side of the cylindrical terminal 29, the pin-shaped terminal 27 and the cylinder fixed to the fixing portion 28 are fixed. Thus, the axial and radial positioning of the terminal 29 can be performed easily and accurately.
Further, since it is not fixed by press fitting as in the prior art, it is not necessary to finish the through hole 26 of the holder 25 for fixing the fixing portion 28 with high accuracy. For this reason, since the holder 25 can be formed by press molding, the holder 25 can be manufactured easily. Accordingly, unlike conventional cutting, no chips are generated, so there is no waste of materials and high costs can be suppressed.
Furthermore, since the cylindrical terminal 29 is fixed to the holder 25 by press-fitting the inner diameter side of the outer cylindrical portion 30 of the holder 25 to the outer diameter side of the cylindrical terminal 29, the cylindrical terminal 29 can be easily attached to the holder 25. And it can be fixed securely.

Further, the fixed portion 28 fixed to the outer peripheral portion of the pin-shaped terminal 27 is rotated by a predetermined angle (for example, 90 °) around the axis of the pin-shaped terminal 27 and formed in the through hole 26. By being engaged with the engaging portion 35 so as not to move in the axial direction, it is fixed to the through-hole 26 and is not fixed by press-fitting into the through-hole as in the prior art. Does not work.
Therefore, it is possible to prevent the fixing portion 28 from being cracked due to the press-fitting.

  Further, the engaging portion 35 is an inner flange 35a in which a deformed hole 35b other than a circle is formed in the central portion, and the fixed portion 28 is a large diameter portion 28a having a larger diameter than the deformed hole 35b, and a deformed hole 35b. A small diameter that passes through the deformed hole 35b and is rotated by a predetermined angle around the axis so that the peripheral edge of the deformed hole 35b is sandwiched between the large diameter portion 28a. Since the large-diameter portion 28a and the small-diameter portion 28b sandwich the peripheral portion of the deformed hole 35b formed in the inner flange 35a, the fixing portion 28 can be easily and easily inserted into the through-hole 26. It can be fixed in a state where it is securely retained.

In the present embodiment, the electromagnetic actuator according to the present invention has been described by way of example as being used in an electromagnetic valve unit that forms part of a gas extinguishing safety device such as a gas stove or a gas water heater. Such an electromagnetic actuator may be used in any device as long as it is operated by a thermoelectromotive force of a thermocouple or an external power source such as a dry battery.
Further, in the present embodiment, the case where an oval hole is adopted as the deformed hole has been described as an example. However, the deformed hole may be any other of a rectangular hole, an oblong hole, an elliptical hole, and a D cut hole. Also good.
In this case, the fixed portion can be inserted into the large-diameter portion having a larger diameter than the modified hole and the modified hole, and after passing through the modified hole, and rotated by a predetermined angle around the axis, the peripheral edge of the modified hole Any shape may be used as long as the portion has a small-diameter portion that is in contact with the peripheral edge portion sandwiched between the large-diameter portion.

(Second Embodiment)
6 is a cross-sectional view showing an electromagnetic actuator according to a second embodiment of the present invention, FIG. 7 is an enlarged cross-sectional view of a holder to which a fixing portion and a pin-like terminal are attached, and FIG. 8 is a pin to which the fixing portion is fixed. FIG. 2A is a front view, FIG. 2B is a plan view, FIG. 3C is a bottom view, and FIG.

  The electromagnetic actuators shown in these drawings are different from the electromagnetic actuator of the first embodiment in that the structure of the fixing part fixed to the outer peripheral part of the pin-shaped terminal 27 and the fixing part are fixed to the through hole 26. Since this is a fixing method and a fixing structure, this point will be described in detail below, and the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be simplified or omitted.

  As shown in FIG. 8, the fixing portion 40 is formed in a substantially cylindrical shape by an electrically insulating resin material. Concave and convex portions 41 are continuously formed along the circumferential direction in a substantially lower half of the outer peripheral portion of the fixed portion 40. The concavo-convex portion 41 has a spline shape configured by alternately providing the concave portions 41 a and the convex portions 41 b in the circumferential direction. The concave portions 41 a and the convex portions 41 b The pin-shaped terminal 27 extends in the axial direction. Further, the lengths of the concave portion 41a and the convex portion 41b in the circumferential direction are substantially equal, and the bottom surface of the concave portion 41a and the upper surface of the convex portion 41b are arcuate surfaces coaxial with the fixing portion 40, respectively. Furthermore, the corners at both ends in the circumferential direction on the upper surface of the convex portion 41b are chamfered to have an R shape.

  A central hole is formed at the center of the fixing portion 40 along the axis and opens at the upper and lower end surfaces. The pin-like terminal 27 is inserted and fixed in the central hole. Note that the fixing portion 40 is molded integrally with the pin-shaped terminal 27 so that the pin-shaped terminal 27 is disposed in the center hole. Convex portions 27a are formed on the outer peripheral portion of the pin-shaped terminal 27 along the circumferential direction, and a concave portion 28d fitted with the convex portion 27a is formed along the circumferential direction on the inner peripheral surface of the center hole of the fixing portion 40. Is formed. By fitting the convex portion 27 a into the concave portion 28 d, the fixing portion 40 is fixed to the outer peripheral portion of the pin-like terminal 27 so as not to be pulled out.

As shown in FIGS. 6 and 7, the holder 25 is formed by press-molding a thin disk made of a conductive metal material, as in the first embodiment. It has a part 30 and an inner cylinder part 31.
The outer cylinder part 30 is comprised by the large diameter part 30a, the small diameter part 30b, and the flange part 30c which connects these. Further, four notches 30d are formed at equal intervals in the circumferential direction at the upper edge of the small diameter portion 30b.

The inner cylinder part 31 is comprised by the large diameter part 31a, the small diameter part 31b, and the flange part 31c which connects these.
A circular recess 32 is formed by the inner peripheral surface of the large-diameter portion 31a of the inner cylinder portion 31 and the upper surface of the flange portion 31c. The terminal 3c extending from the coil complete 3a passes through the fixed iron core 3b and is inserted into the cylindrical pin-shaped terminal 27 up to its tip, and both are welded and electrically joined at the tip.

  Further, the small diameter portion 31 b of the inner cylinder portion 31 extends downward from the flange portion 31 c, and the lower end thereof protrudes downward from the lower end of the outer cylinder portion 30. And this small diameter part 31b comprises the through-hole 26 formed in the said holder 25. As shown in FIG. The small-diameter portion 31b has a slightly longer axial length than the small-diameter portion 31b of the inner cylinder portion 31 in the first embodiment.

In order to attach the pin-shaped terminal 27 having the fixing portion 40 to the holder 25, first, an O-ring 36 as a seal member is attached to the pin-shaped terminal 27 as shown in FIGS. When attaching the O-ring 36 to the pin-shaped terminal 27, the O-ring 36 is attached so as to contact the lower end surface of the fixing portion 40.
Next, the pin-like terminal 27 having the fixing portion 40 to which the O-ring 36 is attached is inserted into the inner cylinder portion 31 from above so that the tip of the pin-like terminal 27 is directed downward, and penetrates the fixing portion 40. Insert into hole 26. In this case, the pin-shaped terminal 27 is inserted until the O-ring 36 contacts or comes close to the inner flange 35a of the inner cylinder portion 31.
In the present embodiment, the hole formed in the bottom of the inner cylinder portion 31 may not be the irregular hole 35b as in the first embodiment, but may be a normal circular hole.

Next, the fixing portion 40 is fixed to the through hole 26 by caulking the small diameter portion 31 b of the inner cylinder portion 31 from the outer peripheral side.
In this case, of the concavo-convex portion 41 formed on the outer peripheral portion of the fixed portion 40, the inner cylinder portion 31 is pressed from the outer peripheral side to the lateral direction (radially inner side) with a punch or the like at a position K facing the concave portion 41a. Clamp. The crimping position K is, for example, a position obtained by dividing the outer periphery of the inner cylinder portion 31 into three at equal intervals, that is, a position divided by 120 degrees and a position facing the recess 41a.

  Thus, by fixing the small diameter portion 31 b of the inner cylinder portion 31 from the outer peripheral side and fixing the fixing portion 40 to the through hole 26, the fixing portion 40 can be easily and reliably fixed to the through hole 26.

When the electromagnetic actuator 1 is manufactured, after passing the small-diameter portion 28b of the fixing portion 28 through the deformed hole 35b as in the first embodiment, the fixing portion 28 is rotated around the axis together with the pin-shaped terminals 27. When the fixing portion 28 is fixed to the through hole 26 by rotating and rotating the small diameter portion 28b by a predetermined angle (for example, 90 °), the time required for the fixing portion 28 is relatively long. In this embodiment, the fixing portion 40 is fixed to the through hole 26 by caulking the small-diameter portion 31b of the inner cylinder portion 31 from the outer peripheral side, so that the time required for fixing can be shortened. The manufacturing time of the electromagnetic actuator can be shortened.
Further, the concave and convex portion 41 is continuously formed along the circumferential direction on the outer peripheral portion of the fixed portion 40, and the inner cylindrical portion 31 is located at a position facing the concave portion 41 a of the concave and convex portion 41 and the small diameter portion 31 b of the inner cylindrical portion 31. Since the outer periphery of the outer peripheral wall is crimped from the outer peripheral side at a position K that is divided into three at equal intervals, the crimped portion of the outer peripheral wall of the small-diameter portion 31b engages with the recess 41a. Therefore, the fixing portion 40 can be reliably fixed to the through hole 26 so as not to move in the axial direction and the circumferential direction.

  Needless to say, the present embodiment can provide the same effects as those of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Electromagnetic actuator main body 20 Terminal unit 25 Holder 26 Through-hole 27 Pin-shaped terminals 28 and 40 Fixing part 29 Cylindrical terminal 30 Outer cylinder part 31 Inner cylinder part 32 Recessed part 35 Engagement part 35a Inner flange 35b Deformed hole

Claims (6)

An electromagnetic actuator that is operated by thermoelectromotive force of a thermocouple or an external power source such as a dry cell,
An electromagnetic actuator body and a terminal unit attached to the electromagnetic actuator body;
The terminal unit is
A holder to which a coil portion of the electromagnetic actuator body is attached;
A pin-like terminal that is inserted into a through-hole formed in the holder and into which an end portion of the coil of the coil portion is inserted,
A fixed portion fixed to the outer peripheral portion of the pin-shaped terminal and fixed to the through hole;
A cylindrical tubular terminal provided around the pin-shaped terminal protruding from the through hole and fixed to the holder;
The holder has an inner cylinder part and an outer cylinder part provided coaxially on the outer side of the inner cylinder part,
The through hole is constituted by the inner cylinder portion,
The fixing portion is inserted and fixed in the through hole,
The electromagnetic actuator, wherein the cylindrical terminal is fixed to the holder by press-fitting an inner diameter side of the outer cylinder portion into an outer diameter side of the cylindrical terminal.   The electromagnetic actuator according to claim 1, wherein the fixing portion is fixed to the through hole by caulking the inner cylinder portion from the outer peripheral side.   An uneven portion is continuously formed along the circumferential direction on the outer peripheral portion of the fixed portion, and the inner tube portion is crimped from the outer peripheral side at a position facing the concave portion of the uneven portion. The electromagnetic actuator according to claim 2.   The electromagnetic actuator according to claim 3, wherein the uneven portion has a spline shape.   The recessed part is formed in the upper end part of the said inner cylinder part of the said holder, At least one part of the said coil part is mounted | worn in this recessed part, The any one of Claims 1-4 characterized by the above-mentioned. Electromagnetic actuator.   The electromagnetic actuator according to any one of claims 1 to 5, wherein the holder is formed by press molding.

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