JP5778902B2 - Female thread member, motor-operated valve using the same, and method for manufacturing female thread member for motor-operated valve - 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. 9, 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. 9A shows a sectional view when fully closed, and FIG. 9B shows a sectional view when fully opened. FIGS. 9C and 10 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, in the state shown in FIG. 9B, when the stator is energized and energized in one direction, the rotor 57 rotates in the clockwise direction as viewed from above, and the male screw member 60 also The male screw 60a rotates and descends while being engaged 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.

  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 in the posture shown in FIG.

  On the other hand, when the motorized valve 51 is opened, when the stator is energized by energizing the stator in the opposite direction to the state shown in FIG. 9A, the rotor 57 rotates counterclockwise as viewed from above, and the male screw member 60 is also The male screw 60a rotates and rises while being screwed into 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.

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. 11, 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 is going to manufacture using, the stopper part 61f will be undercut and the core 70 will be unable to rotate. That is, after forming the female screw member 61, even if the core 70 is rotated to be taken out downward, the core 70 cannot be rotated because the stopper portion 61f exists and cannot be taken out downward.

  Therefore, as shown in FIG. 12, in addition to the upper die 71 and the lower die 72, two cores 73 and 74 (the core 73 formed to form 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 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 avoiding an undercut of the stopper portion 61f. Thus, the inner wall surface of the female screw member 61 can be formed. However, even in that case, it is difficult to completely match the cores between the cores 73 and 74, so that a misalignment occurs between the female screw 61 a and the lower end 61 c of the female screw member 61, and the male screw member 60. (See FIG. 9) There is a problem that a problem occurs when integrating with (see FIG. 9).

  In addition, when a gap is generated between the cores 73 and 74, burrs are generated at the portions, and the burrs must be removed, which increases the manufacturing cost of the motor-operated valve 51. 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 is formed continuously at the bottom of the cylindrical portion, and has an internal thread formed with an internal thread having an inner diameter smaller than the cylindrical portion, and the bottom of the cylindrical portion An internal thread member integrally formed of resin , at least a part of which is recessed from the end of the internal thread portion in the direction of the central axis of the internal thread, and a concave portion having a working surface in the rotation direction around the central axis. the recess is provided with a helical inclined plane which one round inclined from said working surface in a spiral around the central axis of the internal thread, the height of the working surface is equal to or less than the pitch of the female screw .

The female screw member of the present invention is formed continuously at the bottom of the cylindrical portion, and has an internal thread portion formed with an internal screw having an inner diameter smaller than the cylindrical portion, and at least a part of the bottom of the cylindrical portion is the A female screw member that is recessed from the end of the female screw portion in the direction of the central axis of the female screw, and that has a working surface in the rotational direction around the central axis, and is integrally molded with resin,
The recess is provided with a helical inclined surface inclined from the working surface in a spiral around the central axis of the internal thread, said helical inclined surfaces, assuming the female screw member is rotated in accordance with threaded of the female screw In this case, it is formed so as not to interfere with the spiral inclined surface before rotation .

  In the female screw member, the spiral inclined surface is provided with at least one flat portion perpendicular to the central axis between one round from the working surface and reaching the working surface again. .

  In the female screw member, the spiral inclined surface includes at least a portion where a developed view thereof is a straight line.

  And according to the present invention, since the inner wall portion of the female screw member can be formed with a single core, no misalignment occurs between the female screw of the female screw member and its lower end, and Generation of burrs can be prevented.

  In the female screw member, the working surface is a full-open fixed stopper that comes into contact with a full-open movable stopper provided on a valve shaft of an electric valve screwed to the female screw.

  Further, 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 used as an electric valve.

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

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

  And according to the electric valve of the present invention, since the female screw member can be formed with a single core, the misalignment does not occur between the female screw part and the lower end part of the female screw member of the electric valve, Moreover, generation | occurrence | production of a burr | flash can be prevented and the manufacturing cost of a motor operated valve can be reduced.

The present invention also provides a male screw member that rotates with the rotation of the rotor of the electric motor and that engages with a female screw member that is fixed to the valve main body, and the male screw member that rotates, thereby rotating the valve seat in the valve main body. And a valve body that contacts and separates from the valve body, wherein the female screw member is formed continuously from the bottom of the recess having a cylindrical space on the valve body side, which has a smaller inner diameter cylindrical space, and the internal thread portion of the male screw portion screwed in the male screw member, the concave portion is recessed at least partially into the female screw portion, at the time of full opening of the electric valve, the A full-open stopper portion that abuts against a stopper portion that rotates in accordance with the rotation of the rotor of the electric motor and restricts the rotation of the male screw member in the valve opening direction, and when forming the female screw member, the female screw member Molding the valve body Using a lower die because, the upper mold for molding the female thread portion of the female screw member, and one of the core for simultaneously molding and the concave portion and the female screw portion, the tang is The mold can be removed without buffering with the fully-open 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 method for manufacturing the female screw member of the electric valve, the fully open stopper portion includes a contact surface that contacts a stopper portion that rotates as the rotor of the electric motor rotates, and an edge portion of the corresponding contact surface. A spirally inclined surface that is gradually inclined in a direction away from the inner surface, and a circumferential inner surface located on the axial line side of the female screw portion, wherein the core is the contact surface, the spirally inclined surface, and the circumferential inner surface. Can be molded.

  Further, in the method for manufacturing the female screw member of the 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 cylindrical portion, The female thread member can be insert-molded by sandwiching the joining ring between the lower mold and the upper mold.

  As described above, according to the present invention, there is no misalignment between the female thread and the lower end of the female thread member of the motor-operated valve, and the generation of burrs can be prevented, thereby producing the motor-operated valve. It is possible to provide a female screw member capable of reducing the cost, a motor-operated valve using the female screw member, and a method of manufacturing the female screw member.

  In addition, as a result of the working surface being formed as a recess, only one surface of the working surface is opened, and the other surface (three surfaces) is supported by the female screw member. Compared with the case where it forms with a rod-shaped body, the intensity | strength becomes high and durability as an action surface improves.

It is a figure which shows 1st Embodiment of the internal thread member concerning this invention, Comprising: (a) is a top view, (b) is the sectional view on the AA line of (a), (c) is a bottom view. It is a figure which shows the internal thread member of FIG. 1, Comprising: (a) is an overhead view, (b) is an elevation view. It is a figure which shows the internal thread member of FIG. 1, Comprising: (a) is a cross-sectional elevation view, (b) is a partially broken elevation view. It is a figure which shows an example of the metal mold | die used with the manufacturing method of the internal thread member concerning this invention, Comprising: (a) is front sectional drawing, (b) is a partially broken perspective view. It is a partially broken perspective view which shows the internal thread member of FIG. 1, and the core of the metal mold | die of FIG. It is a perspective view which shows the core of the metal mold | die of FIG. It is a figure which shows 2nd Embodiment of the internal thread member concerning this invention, Comprising: (a) is a top view, (b) is the BB sectional drawing of (a), (c) is a bottom view. It is a figure which shows the modification of the helical inclined surface 1e, and pulls out the helical inclined surface 1e using the expanded view which developed this helical inclined surface 1e centering on the central axis of the internal thread 1a (drawing of the core 13) It is explanatory drawing which shows the mode. 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. 9, Comprising: (a) is an overhead view, (b) is a partially broken elevation view, (c) is an elevation view. FIG. 10 is a partially broken cross-sectional view for explaining that the female screw member of FIG. 9 cannot be formed with one core. It is a figure which shows an example of the metal mold | die used when manufacturing the internal thread member of FIG. 9, 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 to 3 show a female screw member according to the present invention, and this female screw member (valve shaft holder) 1 has substantially the same configuration and function as the female screw member 61 shown in FIG. Are formed on the upper surface of the female screw portion 1b, a fully closed lower stopper portion (fully closed fixing stopper) 1d, and one end of the female screw portion 1b coaxially with the female screw portion 1b. A cylindrical portion 1c having a cylindrical space 1j having a diameter larger than the thread diameter of the female screw 1a, and a bottom surface 1n of the end portion of the female screw portion 1b in the cylindrical space 1j, in other words, a fully open recess recessed at the bottom of the cylindrical portion 1c A stopper portion (full open fixing stopper) 1f is provided, and a joining ring 2 is integrally provided at a lower end portion 1g via a protrusion 1h.

  The fully open stopper portion 1f is formed in the rotation direction about the central axis of the female screw 1a, and a contact surface (working surface) 1k that contacts the fully open stopper portion 67 shown in FIG. 9, and FIG. 3 (b). As shown clearly, the spiral inclined surface (a part of the ceiling surface (bottom) of the cylindrical portion 1c) 1e gradually inclined upward from the lower edge portion of the corresponding contact surface 1k and the axial line side of the female screw 1a And a circumferential inner surface 1m. That is, the lowermost part of the spiral inclined surface 1e (that is, the lower edge portion of the contact surface 1k) is flush with the end lower surface 1n that is the end of the female screw portion 1b on the cylindrical space 1j side. The spiral inclined surface 1e is formed so as to be gradually recessed upward from that portion.

  In this case, the spiral inclined surface 1e is expressed as a straight line when developed around the central axis of the female screw 1a, and comes into contact again from the lower edge of the contact surface 1k in the rotational direction of the female screw. It is continuously formed until it reaches the upper end of the surface 1k (that is, until it makes a round). Further, the height (length in the central axis direction) T of the contact surface 1k is set to be equal to or less than the pitch P of the female screw 1a. The rotation of the rotor 57 is forcibly stopped when the fully open stopper portion 67 (FIG. 9) contacts the fully open stopper portion 1f.

  The female screw member 1 is different from the female screw member 61 in that the inner wall surface of the female screw member 1 is formed by one core, so that the fully open stopper portion 1f has a spiral inclined surface 1e and a circumferential inner surface 1m. The other parts have the same configuration as the female screw member 61.

  4 to 6 show a mold for forming the female screw member 1, and in FIG. 4B, the core 13 is drawn as a transparent body for easy understanding of the drawing. The mold includes an upper mold 11, a lower mold 12, and one core 13.

  The upper mold 11 includes a gap 11 a for forming the female screw part 1 b side of the female screw member 1 and the upper part of the cylindrical part 1 c between the core 13 and the injection port 11 b of the resin R.

  The lower die 12 is a ring shape for insert-molding the joint ring 2 on the upper surface and a gap 12a for molding the lower end portion 1g side (lower portion of the cylindrical portion 1c) of the female screw member 1 with the core 13. The housing portion 12b is provided.

  The core 13 is provided with a male screw portion 13a for forming the female screw 1a of the female screw member 1 and an abutting surface 1k of the female screw member 1 on the upper portion so that the inner wall surface of the female screw member 1 can be formed by itself. In order to form the spiral inclined surface 1e that continuously inclines from the tip of the contact surface 1k and makes one round so that the flat portion 13c for forming and the fully open stopper portion 1f of the female screw member 1 are not undercut. A spiral portion 13b, an upper surface 13d for molding the lower end surface 1n of the female screw member 1 (region inside the circumferential inner surface 1m), and a columnar shape for molding the cylindrical space 1j of the female screw member 1. A portion 13e and a ridge 13f extending at the lower end are provided. This protrusion 13f is for rotating and pulling out the core 13 after the female screw member 1 is molded.

  As shown in FIG. 4, after the joining ring 2 is accommodated in the accommodating portion 12 b of the lower mold 12 using the above mold, the resin R is injected from the combination of the upper mold 11, the lower mold 12 and the core 13, and the injection port 11 b. And let it harden. 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. As described above, since the height T of the contact surface 1k is set to be equal to or less than the pitch P of the female screw, the spiral portion 13b of the core 13 is brought into contact with the spiral inclined surface 1e of the female screw member 1 during the removal. Therefore, the fully open stopper portion 1f does not undercut, and the core 13 can be easily removed because it moves smoothly away from the spiral inclined surface 1e along with the rotation of the core 13. That is, if the portion of the fully open stopper portion 1f on the downstream side in the rotational direction of the core 13 is, for example, a vertical surface (surface perpendicular to the rotational direction) as shown in FIG. The upper stopper portion 1f is undercut, but the portion of the fully open upper stopper portion 1f on the downstream side in the rotational direction of the core 13 moves when the core 13 is taken out (moves in the axial direction of the female screw while rotating). Undercut does not occur because it is formed to draw a spiral as in

  In the female screw member 1 manufactured as described above, as shown in FIG. 1, the fully open stopper portion 1f has a contact surface 1k and a spiral inclined surface 1e, and the fully open stopper portion 67 shown in FIG. When it comes into contact with the fully open stopper portion 1f, the rotation of the rotor 57 is forcibly stopped, and the electric 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. 7, the same reference numerals as those in FIGS. 1 to 6 denote the same or equivalent parts.

  The female screw member 1 shown in FIGS. 1 and 2 has a fully open stopper portion (full open fixing stopper) 1f recessed in the bottom surface 1n of the end portion of the female screw portion 1b, in other words, the bottom portion of the cylindrical portion 1c. However, the female screw member 1 ′ according to the present embodiment has a fully open stopper portion 1f in which a part protrudes from the lower end surface 1n of the female screw portion 1b toward the cylindrical portion 1c and a part thereof is recessed in the lower end portion 1n. The other configuration is the same as that of the female screw member 1. Also in this embodiment, the height (length in the central axis direction) T of the contact surface 1k is set to be equal to or less than the pitch P of the female screw 1a.

  In order to mold the female screw member 1 ′ configured in this way, the core is replaced with the spiral portion 13 b and the plane portion of the core 13 shown in FIG. 6 in order to mold the concave fully open stopper portion 1 f ′. 13c is configured to be lower than the upper surface 13d (in other words, the upper surface 13d is configured to intersect at an intermediate position of the spiral portion 13b), and the upper mold 11 and the lower mold shown in FIG. A mold 12 may be used. And after injection | pouring and hardening of resin with respect to a metal mold | die, by removing the lower mold | type 12 and rotating a core after that, fully open stopper part 1f 'does not become an undercut, but a core can be removed easily. .

  Further, when the female screw member 1 ′ manufactured as described above is applied to the motor-operated valve 51 as shown in FIG. 9, the fully open stopper portion 67 shown in FIG. 9 is brought into contact with the fully open stopper portion 1f ′. When abutting against (the side surface of the fully open stopper portion 1f ′), the rotation of the rotor 57 is forcibly stopped, and the motor-operated valve 51 is fully opened.

  In the above description, the spiral inclined surface 1e makes a round around the central axis of the female screw member from the lower edge (tip) of the contact surface 1k, and again the upper end of the contact surface (opposite the tip). However, the present invention is not limited to this, and as will be described later with reference to FIG. 8, a flat portion is formed at the front end and / or rear end of the spiral inclined surface 1e. (A plane perpendicular to the central axis of the female screw) may be formed.

  FIG. 8 is a view showing a modification of the spiral inclined surface 1e, and shows a state in which the spiral inclined surface 1e is pulled out using a development view in which the spiral inclined surface 1e is developed around the central axis of the female screw 1a. (The horizontal axis in FIG. 8 shows the rotation angle of the female screw 1a, the vertical axis shows the direction of the central axis of the female screw 1a, and the inclination angle of the inclined surface 1e is drawn slightly exaggerated.) . In FIG. 8, the same reference numerals as those in FIGS. 1 to 7 denote the same or equivalent parts.

  FIG. 8A shows a modification of the present invention, in which a flat portion 1x is provided at the tip of the spiral inclined surface 1e (joint portion with the tip of the contact surface 1k). In this case, as shown in the figure, when it is assumed that the female screw member 1 is rotated in accordance with the threading of the female screw 1a (reference numeral 1f is the fully open stopper before rotation, reference numeral 1f is the fully open stopper after rotation). 1f ″), the inclined angle of the helical inclined surface 1e, the height of the contact surface 1k, and the flat portion 1x so that the rotated helical inclined surface 1e does not interfere with the non-rotating helical inclined surface. In other words, the core 13 is set so that the inclination angle of the spiral inclined surface 1e, the height of the contact surface 1k, the distance of the flat portion 1x, and the like set as described above can be obtained. According to this configuration, when the core 13 is taken out, the spiral portion 13b of the core 13 does not interfere with the spiral inclined surface 1e of the female screw member, and the core 13 can be taken out.

  As in this example, by providing the flat portion 1x at the tip of the spiral inclined surface 1e, the strength of the contact surface of the fully open stopper portion 1f is increased, and the durability is not deteriorated due to the collision with the fully open stopper portion 67. can do.

  FIG. 8C shows another modification of the present invention, in which a flat portion 1x is provided at the tip of the spiral inclined surface 1e (joint portion with the tip of the contact surface 1k), and the spiral is further provided. A flat portion 1y is provided at the rear end of the inclined surface 1e (joint portion with the lower end of the contact surface 1k). Also in this example, when it is assumed that the female screw member 1 is rotated according to the threading of the female screw 1a, the fully open stopper portion prevents the rotated spiral inclined surface 1e from interfering with the non-rotated spiral inclined surface. If 1f is formed, the core 13 can be pulled out.

  FIG. 8B assumes that when the flat portions 1x and 1y are provided before and after the spiral inclined surface 1e as shown in FIG. 8C, the female screw member 1 rotates according to the threading of the female screw 1a. In this case, the rotated spiral inclined surface 1e interferes with the non-rotated spiral inclined surface. In this case, when the core 13 is pulled out, the core 13 interferes with the spiral inclined surface 1e, and the core 13 cannot be pulled out.

  Furthermore, as described above, the present invention not only forms the flat portions 1x and 1y at the tip and / or the rear end of the spiral inclined surface 1e, but also forms a flat portion in the middle of the spiral inclined surface 1e. Alternatively, the spiral inclined surface 1e may have a plurality of inclination angles, or may be formed so that the developed view thereof is not a straight line but a curve as described above.

  In any case, when it is assumed that the female screw member 1 is rotated in accordance with the threading of the female screw 1a, the spiral spiral surface 1e that has been rotated is appropriately spirally prevented from interfering with the spiral inclined surface that is not rotating. The core 13 can be taken out by setting the inclination angle of the inclined surface 1e and the height of the contact surface 1k. When the spiral inclined surface 1e has a plurality of inclination angles or continuous inclination angles, the core 13 may be removed at an angle equal to or greater than the maximum inclination angle.

Furthermore, the present invention is not only applied to the female screw member of the motor-operated valve, but also has a female screw portion formed continuously with the bottom of the cylindrical portion and having a female screw having an inner diameter smaller than that of the cylindrical portion, and a cylindrical shape. Any female screw member may be applied to any part or product as long as the female screw member has a protrusion that protrudes from the bottom of the female screw in the direction of the central axis of the female screw and has a working surface in the rotation direction around the central axis. Also, female screw member of the present invention, have a limited only to those shown in FIGS. 1 and 7.

  As described above, in each of the above-described embodiments, the contact surface 1k of the fully open stopper portion is formed so as to bite into the female screw portion 1b. As a result, the open end of the contact surface 1k is the fully open stopper portion. Only the end surface on the 67 side is provided, and the end surface of the corresponding contact surface 1k opposite to the fully opened stopper portion 67 and its both side surfaces are supported (integrally formed) by the female screw portion 1b. That is, as shown in the above-mentioned Patent Documents 1 and 3, the stoppers that contact each other are formed by simple protrusions, or compared with the case where the stoppers are configured by simple rod-shaped bodies as shown in Patent Document 2. Since the support surface of the surface 1k increases, the strength of the corresponding contact surface 1k increases as compared with the motor-operated valve shown in each document.

  As a result, even if contact between the contact surface 1k and the fully open stopper portion 67 is repeated, deformation of the contact surface 1k is reduced, durability of the motor-operated valve is increased, and strength of the contact surface 1k is increased. As a result, it is not necessary to precisely control the contact amount (contact area) between the corresponding contact surface 1k and the fully opened stopper portion 67, and the dimensional management of each part of the motor-operated valve is facilitated. Productivity is improved.

1, 1 'Female thread member 1a Female thread 1b Female thread part 1c Cylindrical part 1d Fully closed stopper part (Fully closed fixed stopper)
1e Spiral inclined surface 1f, 1f 'Fully open stopper (full open fixed stopper)
1g Lower end 1h Projection 1j Cylindrical space 1k Contact surface (working surface)
1m Circumferential inner surface 1n End lower surface 1x Flat portion 1y Flat portion 2 Joining ring 11 Upper die 11a Cavity 11b Inlet 12 Lower die 12a Cavity 12b Housing portion 13 Core 13a Male thread portion 13b Spiral portion 13c Planar portion 13d Upper surface 13e Cylindrical part 13f Projection 61f Fully open top stopper part (fully open fixing stopper)
67 Fully open stopper (fully open movable stopper)

Claims (11)

An internal thread portion formed continuously with a bottom portion of the tubular portion and having an internal thread having an inner diameter smaller than the tubular portion, and at least a part of the bottom portion of the tubular portion is formed by the internal thread portion from an end portion of the internal thread portion. A female screw member integrally formed with a resin, including a concave portion having a working surface in a rotational direction around the central axis.
The recess is provided with a helical inclined plane which one round inclined from said working surface in a spiral around the central axis of the internal thread,
The height of the said working surface is below the pitch of the said internal thread, The internal thread member characterized by the above-mentioned. An internal thread portion formed continuously with a bottom portion of the tubular portion and having an internal thread having an inner diameter smaller than the tubular portion, and at least a part of the bottom portion of the tubular portion is formed by the internal thread portion from an end portion of the internal thread portion. A female screw member integrally formed with a resin, including a concave portion having a working surface in a rotational direction around the central axis.
The recess is provided with a helical inclined surface inclined from the working surface in a spiral around the central axis of the internal thread,
The female threaded member is characterized in that the helically inclined surface is formed so as not to interfere with the helically inclined surface before the rotation when it is assumed that the female threaded member is rotated according to the threading of the female screw.   The said helically inclined surface was equipped with at least 1 plane part perpendicular | vertical to the said center axis | shaft between one round from the said working surface and reaching to the said working surface again. Female thread member.   The female screw member according to claim 2, wherein the spiral inclined surface includes at least a portion where a development view thereof is a straight line. The female thread member according to any one of claims 1 to 4, wherein the working surface is a fully open fixed stopper that abuts a fully open movable stopper provided on a valve shaft of a motor-operated valve that is screwed into the female thread. The female screw member according to claim 5 , further comprising a full-close fixing stopper formed at an end portion of the female screw portion opposite to the cylindrical portion. 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 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 and is rotationally driven by the rotor and can be brought into contact with the full-open fixed stopper. A valve body with a valve seat;
The internal thread member according to claim 6 attached to the valve body;
A motor having a rotor and a stator;
A valve shaft having a fully open movable stopper that can be screwed into the female screw of the female screw member and rotated by the rotor and can be brought into contact with the full open fixed stopper; and a fully closed movable stopper that can be brought into contact with the fully closed 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 is formed continuously from the bottom of the concave portion having a cylindrical space on the valve body side, has an inner diameter smaller than the cylindrical space of the concave portion, and is internally threaded with the male screw portion of the male screw member If, on the concave portion at least partially recessed into the female screw portion, at the time of full opening of the electric valve, said electric motor of the stopper part abuts the valve of the male screw member rotating in accordance with rotation of the rotor With a fully open stopper that regulates rotation in the opening direction,
In forming 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 and the recessed portion And a single core for simultaneously forming the core, and the core can be removed from the fully-opened stopper portion without being buffered. The fully open stopper portion includes a contact surface that contacts a stopper portion that rotates as the rotor of the electric motor rotates, and a spiral inclined surface that gradually inclines in a direction away from the valve body from an edge portion of the contact surface. When, and a circumferential inner surface positioned on the axis side of the female screw portion, according to claim 9, wherein the core is characterized by forming the contact surface, helical inclined surface and a circumferential inner surface The manufacturing method of the female screw member for motor-driven valves. 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 according to claim 9 or 1 0, wherein the electric valve for the female screw member, wherein the insert molding the female screw member Te.