JP5650964B2 - Female thread member, motor-operated valve using the same, and method for manufacturing motor-operated female thread member - Google Patents

Description

  The present invention relates to a female screw member, an electric valve using the female screw member, and a method for manufacturing the female screw member of the electric valve.

  As an electric valve used for refrigerant flow control or the like in a refrigeration cycle system, Patent Document 1 includes a drive mechanism that contacts and separates a valve body from a valve seat using rotation of a rotor of an electric motor. There has been proposed a motor-operated valve in which when the valve shaft holder is closed, the upper stopper body fixed to the valve shaft holder collides with the lower stopper body fixed to the guide bush, and the rotation downward movement of the valve shaft ends. In the fully open direction, this motorized valve employs a screw unscrewing structure in which the valve shaft holder is finally disengaged from the guide bush fixed to the valve body and the upward movement of the valve shaft is completed.

  However, the fully open screw unscrewing structure such as the motor-operated valve cannot be adopted for a motor-operated valve having a configuration in which the screwing between the valve shaft holder and the guide bush cannot be released.

  On the other hand, Patent Document 2 includes a valve portion including a valve seat, a valve body, and the like, and a stepping motor portion that is located above the valve portion and contacts and separates the valve body from the valve seat by rotation of a rotor. In addition, there has been proposed an electric control valve provided with a fully open stopper and a fully closed stopper above the rotor in the sealed case.

  However, in the above-mentioned electric control valve, since the full opening / closing stopper is located above the rotor, the total length of the electric control valve becomes long and the number of parts used for the full opening / closing stopper increases, and the assembly workability of the valve deteriorates. However, there is a problem that the manufacturing cost increases. Further, if such a full opening / closing stopper is to be installed in the rotor, it is necessary to reduce the outer diameter of the valve shaft holder in order to provide an installation space, and accordingly, a coil spring for biasing the valve body It is difficult to secure the installation space. For this reason, it has been difficult to reduce the size of the motor-operated valve while maintaining a large valve diameter.

  Therefore, the present applicant has proposed a motor-operated valve in Patent Document 3 that has a small number of parts, is easy to assemble, and can maintain a large valve diameter even when downsized. As shown in FIG. 15, the motor-operated valve is disposed in a valve main body 55 including two conduits 52 and 53 and a valve seat 54, a can 56 joined to the valve main body 55, and the can 56. A rotor 57 that constitutes a part of the electric motor, a stator (not shown) that is fixed to the outer periphery of the can 56, and that rotates the rotor 57, and a male screw member that is integrally connected to the rotor 57 via a support ring 59. (Valve shaft) 60, a lower end portion is fixed to the valve body 55 via a joining ring 65, and a female screw member (valve shaft holder) 61 in which the male screw member 60 is inserted, and the lower end portion of the male screw member 60 are locked. And a valve body 62 or the like that contacts and separates from the valve seat. 15A shows a cross-sectional view when fully closed, and FIG. 15B shows a cross-sectional view when fully opened. FIG. 15C and FIG. 16 show the female screw member 61 integrally formed with the joining ring 65.

  With the above configuration, when the motor-operated valve 51 is closed, for example, in the state shown in FIG. 15B, when the stator is energized in one direction and excited, the rotor 57 rotates in the clockwise direction as viewed from above, and the male screw member 60 also The male screw 60a is rotated and lowered while being screwed with the female screw 61a, the valve body 62 is seated on the valve seat 54, and the motor-operated valve 51 is closed.

  At the time when the valve body 62 is seated on the valve seat 54, the fully closed upper stopper portion 59a does not reach the fully closed lower stopper portion 61d, and the rotor 57 is further rotatable. When the rotor 57 further rotates clockwise when viewed from above, and the fully closed upper stopper portion (fully closed movable stopper) 59a contacts the fully closed lower stopper portion (fully closed fixed stopper) 61d, the rotation of the rotor 57 is forced. Stopped. Each of the fully-closed stopper portion 59a and the fully-closed stopper portion 61d has a contact surface in the rotation direction around the central axis of the female screw 61a.

  Further, when the valve body 62 is seated on the valve seat 54, the movement of the valve body 62 is stopped, but the male screw member 60 is further lowered, so that the coil spring 64 is compressed and presses the valve body 62 against the valve seat 54, The operation ends with the posture shown in FIG.

  On the other hand, when the motorized valve 51 is opened, for example, in the state shown in FIG. 15A, when the stator is energized in the direction opposite to the above, the rotor 57 rotates counterclockwise as viewed from above, and the male screw member 60 However, the male screw 60a rotates and rises while being screwed with the female screw 61a, the valve body 62 is separated from the valve seat 54, and the motor-operated valve 51 is opened. When the rotor 57 further rotates and the fully open stopper portion (fully open movable stopper) 67 contacts the fully open stopper portion (fully open fixed stopper) 61f, the rotation of the rotor 57 stops and the valve body 62 also stops rising. To do. Each of the fully open stopper portion 67 and the fully open stopper portion 61f has a contact surface (working surface) in the rotation direction around the central axis of the female screw 61a, and the contact surfaces contact each other when the two contact each other.

As described above, according to the motor-operated valve 51, since the two stopper portions 61d and 61f that function when the motor-operated valve 51 is fully opened and fully closed are integrally formed on the female screw member 61, the motor-operated valve 51 can be downsized. In addition, the number of parts is reduced, and furthermore, since the two stopper portions 61d and 61f are integrally formed with the female screw member 61, the positional relationship between the two stopper portions 61d and 61f can be stabilized, and assemblability is improved.
JP 2006-70990 A Japanese Patent Publication No. 6-94910 JP 2010-169173 A

  However, in the motor-operated valve 51 described in Patent Document 3, as shown in FIG. 17, the joining ring 65 is insert-molded so that the female screw member 61 and the joining ring 65 are one core 70 (colored portion in the figure). If it tries to manufacture using, the fully open stopper part 61f will become an undercut, and the core 70 cannot be rotated. That is, after forming the female screw member 61, even if the core 70 is rotated to be taken out downward, the fully open stopper portion 61f exists, so the core 70 cannot be rotated and cannot be taken out downward. .

  Therefore, as shown in FIG. 18, in addition to the upper mold 71 and the lower mold 72, two cores 73 and 74 (the core 73 for forming the female screw 61a and the large diameter formed continuously to the female screw 61a). After fixing the core 73 to the core 74, the core 73 is disposed inside the upper mold 71 and the lower mold 72, and the joining ring 65 is inserted. After the molding, the core 74 and the core 73 are removed in this order, that is, after the core 74 is pulled out or removed by rotating the core 73 while being pulled out, thereby removing the undercut of the fully open stopper portion 61f. By avoiding this, the female thread portion 61a can be formed. However, even in that case, since it is difficult to match the cores between the cores 73 and 74, a misalignment occurs between the female screw 61 a of the female screw member 61 and the cylindrical portion 61 c, and the male screw member 60 and There was a problem that a problem occurred when integrating.

  In addition, when a gap is generated between the cores 73 and 74, burrs are generated at the portions, and it is necessary to remove the burrs, which complicates the configuration of the motor-operated valve 51 and increases the manufacturing cost. . Although the core 74 can be integrated with the lower die 72, the same problem as described above occurs even in that case.

  Therefore, the present invention has been made in view of the above-described problems, and there is no occurrence of misalignment between a female screw of a female screw member such as an electric valve and a cylindrical portion formed continuously therewith. Also provided are a female screw member that can prevent the occurrence of burrs, simplify its structure, and reduce the manufacturing cost, an electric valve using the female screw member, and a method for manufacturing the female screw member for the electric valve. The purpose is to do.

In order to achieve the above object, an internal thread member of the present invention includes an internal thread portion in which an internal thread is formed, a cylindrical portion having an inner diameter larger than the external shape of the internal thread, the internal thread portion and the cylindrical portion, And a connecting portion having a working surface on which a force in a rotational direction acts around the central axis of the female screw, the connecting portion having a tip of the working surface. It is formed so as to be flush with an end portion of the female screw portion or recessed from an end portion of the female screw portion. By setting it as such a structure, the inner side of the said internal thread member can be shape | molded using one core, preventing an undercut.

Further, the female screw member of the present invention includes a female screw portion in which a female screw is formed, a cylindrical portion having an inner diameter larger than the outer shape of the female screw, and a gap that penetrates the female screw portion and the cylindrical portion in the axial direction thereof. A plurality of connecting portions that are connected to each other, and one of the connecting portions has an action surface on which a force in a rotation direction about the central axis of the female screw acts, and a tip of the action surface is It is formed so as to be flush with an end portion of the female screw portion or recessed from an end portion of the female screw portion. With such a configuration, the female screw portion and the cylindrical portion are firmly connected.

  Further, in the female screw member, the connection part in which the action surface is not formed among the plurality of connection parts is formed so as to be recessed from a tip of the connection part in which the action surface is formed. To do. With such a configuration, the member acting on the working surface can be reliably acted on the working surface.

  In the female screw member, the working surface is a working surface of a fully-open fixed stopper that abuts a fully-open movable stopper provided on a valve shaft of an electric valve screwed into the female screw.

  In the female screw member, a full-closed fixing stopper is further formed at an end portion of the female screw portion opposite to the cylindrical portion. With such a configuration, the female screw member can be applied to the electric valve.

  The motor-operated valve according to the present invention includes a valve main body having a valve seat, the female screw member attached to the valve main body, a valve main body for fixing the female screw member, a motor having a rotor and a stator, and the female screw. And a valve shaft having a fully open movable stopper that is screwed into the female screw of the member and is rotationally driven by the rotor and can be brought into contact with the fully open fixed stopper.

  Furthermore, the motor-operated valve of the present invention includes a valve main body provided with a valve seat, the female screw member attached to the valve main body, a motor having a rotor and a stator, a valve main body for fixing the female screw member, A fully open movable stopper that is screwed into the female screw of the female screw member and is rotationally driven by the rotor and can be brought into contact with the fully open fixed stopper; and a valve shaft having a fully closed movable stopper that can be brought into contact with the fully closed fixed stopper. It is characterized by having. With such a configuration, the configuration of the motor-operated valve can be simplified while maintaining the accuracy of the component parts.

In addition, the method for manufacturing a female screw member for an electric valve according to the present invention rotates with the rotation of the rotor of the electric motor, the male screw member screwed with the female screw member fixed to the valve body, and the male screw member rotates. Thus, the method of manufacturing the female screw member of the motor-operated valve comprising a valve body that contacts and separates from the valve seat in the valve body, wherein the female screw member is formed with a female screw that engages with the male screw of the male screw member. An internal thread portion, a tubular portion provided on the valve body side of the internal thread portion and having a cylindrical space larger than the thread diameter of the internal thread, and the internal thread portion and the tubular portion in the axial direction. with coupling so as to have a gap penetrating, and a connecting portion having a full open stopper portion rotating force around the center axis of the internal thread is applied, the end of the tip of the full open stopper portion the internal thread portion Flush with the part or the female screw part Is formed so as to be recessed from the end, at the time of full opening of the electric valve, the fully opened stopper portion rotation of valve opening direction of the stopper portion abuts with the male screw member rotating in accordance with rotation of the rotor of the electric motor regulation and, in molding the female screw member, and a lower mold for molding the valve body of the female screw member, and an upper mold for molding the female thread portion of the female screw member, the female screw portion, with one of the core for forming the coupling portion and the front Symbol tubular portion simultaneously, the upper die is adapted to form the full-open stopper portion and the core and cooperating tang is It is possible to remove the mold without buffering with the fully opened stopper portion.

  According to the present invention, since the female screw member can be formed with a single core, the misalignment does not occur between the female screw portion and the lower end portion of the female screw member of the motor-operated valve. Can be prevented, and the manufacturing cost of the motor-operated valve can be reduced.

  In the manufacturing method of the female screw member for an electric valve, the fully open stopper portion is flush with a stopper surface that rotates with rotation of a rotor of the electric motor, and an end portion of the female screw portion is flush with or A valve body side end surface formed so as to be recessed from the end of the female screw portion, and a circumferential inner surface located on the axis side of the female screw portion, the upper mold forming the contact surface, The child can mold the valve body side end surface and the circumferential inner surface.

  Further, in the method for manufacturing the female screw member for an electric valve, the female screw member is formed in the tubular portion so as to be further recessed than the valve body side end surface of the fully open stopper portion in addition to the fully open stopper portion. A concave portion, the concave portion having a valve main body side end surface located on the valve main body side and a circumferential inner surface located on the axial line side of the female screw portion, the core being the valve main body side end And the inner circumferential surface is molded, and the upper mold can mold the other surface of the concave portion.

  Furthermore, in the method for manufacturing the female screw member for an electric valve, the female screw member has a disk-shaped joining ring for fixing the female screw member to the valve body on the outer surface of the tubular portion, The female screw member can be insert-molded by sandwiching the ring between the lower mold and the upper mold.

  As described above, according to the present invention, there is no misalignment between the female threaded portion of the female threaded member such as the motor-operated valve or the motorized valve and the cylindrical part, and the occurrence of burrs can be prevented. It is possible to provide a female screw member that can reduce the manufacturing cost of an electric valve or the like, an electric valve using the member, and a method of manufacturing the female screw member.

It is a figure which shows an example of the internal thread member manufactured by the 1st Embodiment of this invention, Comprising: (a) is a top view, (b) is the sectional view on the AA line of (a), (c) is a bottom surface FIG. It is a figure which shows the internal thread member of FIG. 1, Comprising: (a) is an overhead view, (b) is a partially broken elevation view, (c) is an elevation view. It is a figure which shows an example of the metal mold | die used by 1st Embodiment of the manufacturing method of the internal thread member for motor-driven valves concerning this invention, Comprising: (a) is front sectional drawing, (b) is BB of (a). It is line sectional drawing (however, the whole metal mold | die shall be drawn in (a)). It is an overhead view of the core 13 in 1st Embodiment. It is a partially broken perspective view of the metal mold | die shown in FIG. It is a partially broken perspective view which shows the internal thread member of FIG. 1, and the core 13 of the metal mold | die of FIG. It is a figure which shows an example of the internal thread member manufactured by the 2nd Embodiment of this invention, Comprising: (a) is a top view, (b) is CC sectional view taken on the line, (c) is a lower surface. FIG. It is a figure which shows an example of the internal thread member manufactured by 3rd Embodiment of the manufacturing method of the internal thread member for motor-driven valves concerning this invention, Comprising: (a) is a top view, (b) is D- of (a). D line sectional drawing, (c) is a bottom view, (d) is a EE line sectional view of (a). It is a figure which shows the internal thread member of FIG. 8, Comprising: (a) is an overhead view, (b) is a partially broken elevation view, (c) is an elevation view. It is a figure which shows an example of the metal mold | die used by 3rd Embodiment of the manufacturing method of the internal thread member for motor-driven valves concerning this invention, Comprising: (a) is front sectional drawing, (b) is FF of (a). It is line sectional drawing (however, the whole metal mold | die shall be drawn in (a)). It is a partially broken perspective view of the metal mold | die shown in FIG. It is a partially broken perspective view which shows the internal thread member of FIG. 8, and the core 43 of the metal mold | die of FIG. It is an overhead view of the core 43 in 3rd Embodiment. It is a figure which shows an example of the internal thread member manufactured by 4th Embodiment of the manufacturing method of the internal thread member for motor-driven valves concerning this invention, Comprising: (a) is a top view, (b) is G- of (a). G line sectional drawing, (c) is a bottom view, (d) is a HH line sectional view of (a). It is a figure which shows the motor-driven valve described in patent document 3, and the internal thread member used for this motor-operated valve, Comprising: (a), (b) is sectional drawing which shows the time of a fully-closed state and a fully-open state, respectively, (C) shows a female screw member. It is a figure which shows the internal thread member of FIG. 15, Comprising: (a) is an overhead view, (b) is a partially broken elevation view, (c) is an elevation view. FIG. 16 is a partially broken cross-sectional view for explaining that the female screw member of FIG. 15 cannot be formed with one core. It is a figure which shows an example of the metal mold | die used in manufacturing the internal thread member of FIG. 15, Comprising: (a) is front sectional drawing, (b) is a partially broken perspective view.

  Next, modes for carrying out the present invention will be described with reference to the drawings.

  1 and 2 show the female screw member (valve shaft holder) of the first embodiment of the present invention, and this female screw member 1 has a configuration substantially similar to the female screw member 61 shown in FIG. A female screw portion 1b in which a female screw 1a is screwed, a fully-closed stopper portion 1d protruding from the upper surface of the female screw portion 1b, and a cylinder having a diameter larger than the screw diameter of the female screw 1a provided on the lower surface side of the female screw portion 1b. A cylindrical portion 1h having a cylindrical space 1j, an end portion 1k of the female screw portion 1b, and a fully open stopper portion (fully open fixing stopper) 1f which are flush with each other, and the joining ring 2 is connected to the cylindrical portion 1h via a protrusion 1m. Are integrally provided.

  The fully open stopper portion 1f includes a contact surface (working surface) for contacting the fully open stopper 67 (FIG. 15) in the rotation direction around the central axis of the female screw 1a (that is, on its side surface). .

  The female screw member 1 is different from the female screw member 61 (FIG. 15) because, as will be described later, since the inside of the female screw member 1 is formed by one core, an arc shape is formed between the female screw portion 1b and the cylindrical portion 1h. The internal thread part 1b and the cylindrical part 1h are connected only at the connecting part 1g including the fully open stopper part 1f.

  3 to 6 show a mold for forming the female screw member 1, and this mold is composed of an upper mold 11, a lower mold 12, and a single core 13. In FIG. 5, the core 13 is drawn as a lightly colored transparent body to make the drawing easier to see.

  The upper die 11 has a gap 11a for molding the female screw part 1b side (the upper side of the female screw part 1b and the cylindrical part 1h) of the female screw member 1 with the core 13, an injection port 11b for the resin R, and 1 When forming with one core 13, the lower surface of the female screw member 1 abuts on the upper surface 13 c of the core 13 except for the portion where the fully open stopper portion 1 f is formed so that the fully open stopper portion 1 f is not undercut. And a cylindrical extending portion 11c with a part cut away.

  The lower mold 12 includes a gap 12a for molding the lower side of the cylindrical portion 1h of the female screw member 1 between the core 13 and a ring-shaped accommodation portion 12b for insert-molding the joining ring 2 on the upper surface. Prepare.

  As shown in detail in FIG. 4, the core 13 includes a male screw portion 13 a for forming the female screw 1 a of the female screw member 1 at the upper portion, an end surface of the female screw portion 1 b on the cylindrical portion 1 h side, and the female screw member 1 fully opened. The upper surface 13c without unevenness for forming the lower surface of the stopper portion 1f, the columnar portion 13e for forming the cylindrical space 1j of the female screw member 1, and the ridge 13f extending to the lower end (FIG. 3) With.

  As shown in FIG. 3, after the joining ring 2 is accommodated in the accommodating portion 12 b of the lower mold 12 using the above mold, the upper mold 11, the lower mold 12 and the core 13 are combined, and the inlet 11 b of the upper mold 11. Then, the resin R is injected and cured. Thereafter, the lower mold 12 is first removed, and then the core 13 is removed from the female screw member 1 while being rotated using the protrusions 13f. At this time, since the upper surface 13c of the core 13 without unevenness is merely in contact with the lower surface of the fully open stopper portion 1f of the female screw member 1 and the end portion 1k of the female screw portion 1b, the fully open stopper portion 1f is undercut. In addition, the core 13 can be easily removed.

  As shown in FIGS. 1 and 2, the female screw member 1 manufactured as described above has the center of the female screw 1 a between the female screw portion 1 b and the cylindrical portion 1 h due to the presence of the extending portion 11 c of the upper mold 11. An arc-shaped gap 1e penetrating in the axial direction is formed, and the female screw portion 1b is in a cantilever shape connected to the cylindrical portion 1h only at the connecting portion 1g. In the lower part of the connecting portion 1g, a fully open stopper 1f is formed flush with the end face of the female screw portion 1b, and the side surface is a contact surface of the fully open stopper 1f.

  Then, when the female screw member 1 manufactured as described above is applied to the motor-operated valve 51 as shown in FIG. 15, the fully open stopper portion 67 shown in FIG. 15 contacts the contact surface of the fully open stopper portion 1f. When it comes into contact (the fully open stopper portion 67 formed narrower than FIG. 15 moves along the gap 1e and finally contacts the contact surface of the fully open stopper portion 1f), the rotation of the rotor 57 is forced. Thus, the motor-operated valve 51 is fully opened.

  Next, a second embodiment of the female screw member according to the present invention will be described with reference to FIG.

  The female screw member 1 shown in FIGS. 1 and 2 has the fully open stopper portion 1f flush with the end 1k of the female screw portion 1b. However, the female screw member 1 ′ according to the present embodiment has the female screw portion 1b. The fully open stopper portion 1 f ′ is formed so as to be recessed from the end portion 1 k, and the other configuration is the same as that of the female screw member 1.

  In order to mold the female screw member 1 ′ configured in this way, the core is formed with a convex portion for molding the concave fully open stopper portion 1 f ′ on the upper surface 13 c of the core 13 shown in FIG. 4. The upper mold 11 and the lower mold 12 as shown in FIGS. 3 and 5 may be used as well as having such a configuration (for example, having a small protrusion 43w as shown in FIG. 13). And after injection | pouring and hardening of resin with respect to a metal mold | die, the upper mold | type 11 and the lower mold | type 12 are removed (pull-out), and then, by rotating the core, the fully open stopper portion 1f ′ is not undercut, and the core is removed. It can be easily removed.

  A wall having a height corresponding to the concave portion of the fully open stopper 1f ′ is provided on the outer periphery of the upper surface 13c of the core 13 shown in FIG. 4, and the upper die 11 is extended by the height. Even if the portion 11c is shortened, the female screw member 1 'of the second embodiment can be formed.

  Further, when the female screw member 1 ′ manufactured as described above is applied to the motor-operated valve 51 as shown in FIG. 15, the fully open stopper portion 67 shown in FIG. 15 is brought into contact with the fully open stopper portion 1f ′. (A side surface of the fully open stopper portion 1f ′) (the fully open stopper portion 67, which is formed narrower than FIG. 15) moves along the gap 1e, and finally contacts the fully open stopper portion 1f ′. The rotor 57 is forcibly stopped, and the motor-operated valve 51 is fully opened.

  Next, a third embodiment of the female screw member according to the present invention will be described with reference to FIGS.

  8 and 9 show a female screw member (valve shaft holder) manufactured according to the present embodiment, and this female screw member 31 has substantially the same configuration as the female screw member 61 shown in FIG. A female screw portion 31b in which 31a is screwed, a fully-closed stopper 31d protruding from the upper surface of the female screw portion 31b, and a cylindrical shape provided on the lower surface side of the female screw portion 31b and having a diameter larger than the screw diameter of the female screw 31a. A cylindrical portion 31h having a space 31j, an end portion 31k of the female screw portion 31b and a fully open stopper portion (full open fixing stopper) 31f flush with the central axis of the female screw 31a, on the opposite side to the fully open stopper portion 31f. It is provided with a recess 31n or the like formed so as to be recessed from the end portion 31k, and the joining ring 32 is integrally provided on the cylindrical portion 31h via the protrusion 31m. The depth from the end 31k of the recess 31n is set to be equal to or less than half the pitch of the female screw 31a.

  As will be described later, the female screw member 31 is different from the female screw member 61 in order to form the inside of the female screw member 31 with one core, so that the center of the female screw member 31 is between the female screw portion 31b and the cylindrical portion 31h. Two arc-shaped gaps 31e and 31p penetrating in the axial direction are formed, and the female screw portion 31b and the cylindrical portion 31h are connected only at two locations of the first connecting portion 31g and the second connecting portion 31q. is there.

  10 to 13 show a mold for forming the female screw member 31, and this mold is composed of an upper mold 41, a lower mold 42, and one core 43. In FIG. 10, the core 43 is depicted as a lightly colored transparent body to make the drawing easier to see.

  The upper die 41 has a gap 41a for forming the female screw 31b side (the upper side of the female screw 31b and the cylindrical portion 31h) of the female screw member 31 with the core 43, an injection port 41b for the resin R, 1 When forming with one core 43, the lower surface of the female screw member 31 has an upper surface 43c of the core 43 except for a portion where the fully open stopper portion 31f and the recess 31n are formed so as not to be undercut. Are provided with halved cylindrical extending portions 41c and 41d.

  The lower die 42 includes a gap 42a for molding the lower side of the cylindrical portion 31h of the female screw member 31 between the core 43 and a ring-shaped accommodation portion 42b for insert-molding the joining ring 32 on the upper surface. Prepare.

  As shown in detail in FIG. 13, the core 43 includes a male screw portion 43 a for forming the female screw 31 a of the female screw member 31 at the top, an end surface 31 k on the cylindrical portion 31 h side of the female screw portion 31 b, and the female screw member 31. In order to mold the upper surface 43c for molding the lower surface of the fully open stopper portion 31f, and the bottom surface (upper surface) of the recess 31n, the small protrusion 43w protruding from the upper surface 43c and the cylindrical space 31j of the female screw member 31 are molded. The columnar part 43e for carrying out and the protrusion 43f extended in the lower end part are provided. In this example, the height of the small protrusion 43w is set to be equal to or less than half the pitch of the female screw 31a (that is, the pitch of the male screw portion 43a).

  10 and 11, the joint ring 32 is accommodated in the accommodating portion 42b of the lower mold 42, and then the upper mold 41, the lower mold 42, and the core 43 are combined. At that time, the core 43 is disposed such that the small protrusion 43w is positioned between the pair of half-cylindrical extending portions 41c and 41d of the upper mold 41.

  Thereafter, the resin R is injected from the injection port 41b of the upper mold 41 and cured. After that, first, the upper die 41 and the lower die 42 are removed (pulled out), and then the core 43 is removed from the female screw member 31 while being rotated using the protrusion 43f. At this time, since the height of the small protrusion 43w is set to be equal to or less than half the pitch of the female screw 31a, the upper surface of the small protrusion 43w can pass through the lower surface of the full-open stopper 31f when the core 43 rotates halfway. . That is, the fully open stopper portion 31f is not undercut, and the core 43 can be easily removed.

  As shown in FIGS. 8 and 9, the female screw member 31 manufactured as described above has a female screw 31 a between the female screw portion 31 b and the cylindrical portion 31 h due to the presence of the extending portions 41 c and 41 d of the upper die 41. Are both cantilever beams in which two arc-shaped gaps 31e and 31p penetrating in the central axis direction are formed, and the female screw portion 31b is connected to the cylindrical portion 31h at two locations of the first connecting portion 31g and the second connecting portion 31q. It has become a shape. The first connecting portion 31g is formed with a fully open stopper 31f, and the second connecting portion 31q is formed with a recess 31n.

  Thus, since the female screw member 31 has a doubly-supported beam shape, the strength of the female screw member 31 is higher than that of the first embodiment.

  Then, when the female screw member 31 manufactured as described above is applied to the motor-operated valve 51 as shown in FIG. 15, the fully open stopper portion 67 shown in FIG. 15 contacts the contact surface of the fully open stopper portion 31f. When it comes into contact (the fully open stopper portion 67 formed narrower than FIG. 15 moves along the gaps 31e and 31p and finally comes into contact with the contact surface of the fully open stopper portion 31f), the rotation of the rotor 57 Is forcibly stopped, and the motor-operated valve 51 is fully opened.

  In this embodiment, the connection between the female thread portion 31b and the cylindrical portion 31h is a doubly supported beam shape formed by two beams arranged at intervals of 180 degrees, and a recess 31n is provided on the opposite side of the fully open stopper 31f. However, since the depth of the recess 31n is less than half the pitch of the female screw 31a than the fully open stopper 31f, even when applied to the electric valve 51 of FIG. If the position (height) of the female screw member 31 in the central axis direction with respect to the upper stopper 31f is correctly managed, there is a possibility that the fully open stopper portion 67 will contact the recess 31n before contacting the fully open stopper 31f. Absent.

  If the above position management can be performed more precisely, the small protrusion 43w is not provided (that is, the recess 31n is not formed, and the end 31k of the female thread 31b is flush with it). The female screw member 31 can also be configured.

  In the above description, it has been described that the recess 31n is on the opposite side (180 degree position) of the fully open stopper 31f with the central axis of the female screw 31a as the center. It may be formed at an angular position. In this case, the depth of the recess 31n provided in the second connecting portion 31q may be determined according to the depth when the core 43 rotates and comes out.

  That is, the depth of the recess 31n is such that when the female screw member 31 moves in the axial direction while rotating (virtually) according to the threading of the female screw 31a, the recess 31n (that is, the small protrusion 43w of the core 43). However, what is necessary is just to set so that it may not interfere with the fully open stopper part 31f which does not rotate.

  Next, a fourth embodiment of the female screw member according to the present invention will be described with reference to FIG.

  The female screw member 31 shown in FIGS. 8 and 9 includes a fully open stopper portion (full open fixing stopper) 31f flush with the end 31k of the female screw portion 31b, and a fully open stopper portion 31f with respect to the central axis of the female screw 31a. Although provided with the recessed part 31n provided in the other side and recessed from the edge part 31k, internal thread member 31 'concerning this embodiment was formed so that it might be recessed from the edge part 31k of the internal thread part 31b. A fully open stopper portion 31f 'and a recess provided on the opposite side of the fully open stopper portion 31f' with respect to the central axis of the female screw 31a and formed to be recessed deeper than the fully open stopper portion 31f 'from the end portion 31k. The other configuration is the same as that of the female screw member 31. The difference in depth between the fully open stopper portion 31f 'and the recess portion 31n' is set to be equal to or less than half the pitch of the female screw 31a.

  In order to mold the female screw member 31 ′ configured as described above, the core is placed on the upper surface 43c of the core 43 shown in FIG. 13 in order to form the concave fully open stopper portion 31f ′ and the concave portion 31n ′. A convex portion for forming the concave fully open stopper portion 31f ′ and a small protrusion 43w having a higher height to form a deeper concave portion 31n ′ are formed, and FIGS. An upper die 41 and a lower die 42 as shown in FIG. Then, after the resin is injected into the mold and cured, the upper mold 41 and the lower mold 42 are removed, and then the core is rotated, so that the fully open stopper portion 31f ′ is not undercut and the core is easily removed. be able to.

  A wall having a height corresponding to the concave portion of the fully open stopper 31f ′ is provided on the outer periphery of the upper surface 13c of the core 13 shown in FIG. 4, and the recess 31n ′ and the fully open stopper are formed on a part of this wall. In this fourth embodiment, a protrusion having a height different from that of the portion 31f ′ is provided, and the extending portions 41c and 41d of the upper die 41 are shortened by the fully opened stopper portion 31f ′. The female screw member 31 'can be formed.

  Further, if the female screw member 31 ′ manufactured as described above is applied to the motor-operated valve 51 as shown in FIG. 15, the fully open stopper portion 67 shown in FIG. 15 is brought into contact with the fully open stopper portion 31f ′. When abutting against (the side surface of the fully open stopper portion 31f ′) (the fully open stopper portion 67 formed narrower than FIG. 15 moves along the gaps 31e and 31p, finally the fully open stopper portion 31f ′). The rotation of the rotor 57 is forcibly stopped, and the motor-operated valve 51 is fully opened.

  In the above embodiment, the female screw portions 1b and 31b and the cylindrical portions 1h and 31c are connected in a cantilever shape (one-point support) or a double-end beam shape (two-point support). However, in this case, the height of the recess 31n may be such that the female screw member 31 rotates (virtually) in accordance with the thread of the female screw 31a as described above. When moving in the direction, the recess 31n may be set so as not to interfere with the fully open stopper 31f that does not rotate.

  Furthermore, the present invention is not only applied to the female screw member of the motor-operated valve, but also protrudes in the direction of the central axis of the female screw, a female screw portion in which the female screw is formed, a cylindrical portion having an inner diameter larger than the outer shape of the female screw portion, and As long as it is a female screw member provided with a working surface, it can be applied to any part or product.

  Further, it is natural that the simultaneous molding of the joining ring 2 is not necessary unless it is necessary in the motor-operated valve to which the female screw member is applied.

1, 1 'Female thread member 1a Female thread 1b Female thread part 1d Fully closed stopper part 1e Clearance 1f, 1f' Fully open stopper part 1g Connection part 1h Cylindrical part 1j Cylindrical space 1k End part 1m Projection 2 Joint ring 11 Upper mold 11a Cavity 11b Inlet 11c Extension part 12 Lower mold 12a Cavity 12b Housing part 13 Core 13a Male thread part 13c Upper surface 13e Cylindrical part 13f Rib 31, 31 'Female thread member 31a Female thread 31b Female thread part 31d Fully closed lower stopper part 31e Gap 31f, 31f 'Fully open upper stopper portion 31g First connection portion 31h Cylindrical portion 31j Cylindrical space 31k End portion 31m Projection 31n, 31' Recess 31p Gap 31q Second connection portion 32 Joint ring 41 Upper mold 41a Gap 41b Note Inlet 41c, 41d Extension part 42 Lower mold 42a Cavity 42b Housing part 43 Core 43a Male thread part 43c Upper surface 43e Circle Columnar part 43f Projection 43w Small projection

Claims (11)

An internal thread portion in which an internal thread is formed;
A cylindrical portion having an inner diameter larger than the outer shape of the female screw;
The female screw part and the cylindrical part are connected so as to have a gap penetrating in the axial direction, and a connecting part having a working surface on which a force in the rotational direction about the central axis of the female screw acts. ,
The connection portion is formed so that a tip of the working surface is flush with an end portion of the female screw portion or recessed from an end portion of the female screw portion. An internal thread portion in which an internal thread is formed;
A cylindrical portion having an inner diameter larger than the outer shape of the female screw;
A plurality of connecting portions for connecting the female screw portion and the cylindrical portion so as to have a gap penetrating in the axial direction;
One of the connecting portions has a working surface on which a force in a rotational direction acts around the central axis of the female screw, and a tip of the working surface is flush with an end of the female screw portion or the female screw portion. An internal thread member formed so as to be recessed from an end.   3. The female screw according to claim 2, wherein a connection portion in which the action surface is not formed among the plurality of connection portions is formed to be recessed from a tip of the connection portion in which the action surface is formed. Element.   The said action surface is an action surface of the fully open fixed stopper contact | abutted to the fully open movable stopper provided in the valve shaft of the motor operated valve screwed in the said internal thread. Female thread member.   The female screw member according to claim 4, wherein a full-closed fixing stopper is further formed at an end of the female screw portion opposite to the cylindrical portion. A valve body with a valve seat;
The female screw member according to claim 4 attached to the valve body;
A valve body for fixing the female screw member;
A motor having a rotor and a stator;
A motor-operated valve comprising: a valve shaft having a fully-open movable stopper that is screwed into a female screw of the female screw member, is rotationally driven by the rotor, and can come into contact with the full-open fixed stopper. A valve body with a valve seat;
The internal thread member according to claim 5 attached to the valve body;
A motor having a rotor and a stator;
A valve body for fixing the female screw member;
A valve shaft having a fully open movable stopper that can be brought into contact with the fully open fixed stopper, and a fully closed movable stopper that can be brought into contact with the fully open fixed stopper; A motor-operated valve comprising: A male screw member that rotates with the rotation of the rotor of the electric motor and that engages with a female screw member fixed to the valve body, and a valve element that contacts and separates from the valve seat in the valve main body by rotating the male screw member A method of manufacturing the female screw member of the electric valve comprising:
The female screw member has a female screw portion in which a female screw to be engaged with the male screw of the male screw member is formed, and a cylindrical space that is provided closer to the valve body than the female screw portion and has a diameter larger than the screw diameter of the female screw. A fully open stopper portion that connects the cylindrical portion, the female screw portion, and the cylindrical portion so as to have a gap penetrating in the axial direction, and a force in a rotational direction about the central axis of the female screw acts. and a connecting portion having, formed so that the tip of the full open stopper portion is recessed from the end portions of the flush or the female screw portion of the female screw portion, at the time of full opening of the electric valve, the fully opened stopper portion the electric motor of the rotor stopper portion rotating with the rotation and contact with the restricting rotation of valve opening direction of the externally threaded member,
When forming the female screw member, a lower die for forming the valve main body side of the female screw member, an upper die for forming the female screw portion side of the female screw member, the female screw portion , and the connecting portion and using the one core for simultaneously forming a pre-Symbol cylindrical portion, said upper die is adapted to form the full-open stopper portion and the core in cooperation with, the tang, the full open stopper A method for manufacturing a female screw member for a motor-operated valve, characterized in that the mold can be removed without buffering.   The fully open stopper portion is formed so as to be indented from a contact surface that contacts a stopper portion that rotates as the rotor of the electric motor rotates, and an end portion of the female screw portion or an end portion of the female screw portion. A valve body side end surface and a circumferential inner surface located on the axis side of the female screw portion, the upper mold forms the contact surface, and the core forms the valve body side end surface and a circumferential shape. 9. The method for producing a female screw member for an electric valve according to claim 8, wherein an inner surface is formed.   The female screw member includes, in addition to the fully open stopper portion, a recessed portion formed in the tubular portion so as to be recessed from the end surface on the valve body side of the fully open stopper portion, and the recessed portion includes the valve body. A valve body side end surface located on the side, and a circumferential inner surface located on the axis side of the female screw portion, the core molds the valve body side end and the circumferential inner surface, and the upper mold The method for manufacturing the female screw member for an electric valve according to claim 9, wherein the other surface of the concave portion is formed.   The female thread member has a disk-shaped joining ring for fixing the female thread member to the valve body on the outer surface of the cylindrical portion, and the joining ring is sandwiched between the lower mold and the upper mold. The method for manufacturing a female screw member for an electric valve according to claim 8, 9 or 10, wherein the female screw member is insert-molded.