Motor-operated valve

Abstract

Motor-operated valve (10) comprising: an engine (20); a linear motion shaft (50) which receives a power of the motor (20) and moves linearly, and which has a valve element (60) which opens and closes a valve port (18) formed at one end of a valve body (11B); and a cylindrical receiving member (25) disposed in the valve body (11B), the cylindrical receiving member (25) having a non-circular hole (26D) and receiving the linear motion shaft (50); an elastic member (28) disposed in the cylindrical receiving member (25) and contacting an outer peripheral surface of the linear motion shaft (50) and regulating a movement of the linear motion shaft (50) in a radial direction; and a non-circular shaft portion (50B) formed in the linear motion shaft (50), which is loosely fitted to the non-circular hole (26D) formed in the valve body (11B) so as to prevent the linear motion shaft (50) from rotating and whose cross section is non-circular; wherein the cylindrical receiving member (25) has a cylindrical main body portion (26) having the non-circular hole (26D) on one end side and a linear motion bearing (27) mounted on the other end side of the cylindrical main body portion (26), and wherein the elastic member (28) is formed of an arc in a shape of an annular ring, and an outer peripheral portion thereof is accommodated between the cylindrical main body portion (26) and the linear motion bearing (27).

Description

TECHNICAL FIELDThe present invention relates to a motor-operated valve having a motor from a drive source.PRIOR ARTAs a conventional motor-operated valve, a motor-operated valve is known in which a linear motion shaft having a valve element at an end tip is driven by a motor (for example, see Patent Literature 1). Another conventional control valve valve can regulate the movement of a valve element in the diametrical direction of a guide member, thus generating no vibration noise (see Patent Literature 2). To this end, the control valve has a valve element support bore defined by a cylindrical guide member and a valve element movably inserted in the axial direction of the guide member while being guided by the guide member to open and close a valve hole. Other conventional valves are disclosed in Patent Documents 3 to 6.DOCUMENTS FROM THE PRIOR ARTPATENT DOCUMENTSPatent Document 1: Japanese Patent Application Laid-Open Publication No. JP H10-169 821 A (paragraph

[0007] and FIG. 1 ).Patent Document 2: Japanese Patent Laid-Open Publication JP 2000-120 883 APatent Document 3: Japanese Patent Laid-Open Publication JP 2008-232 276 APatent Document 4: DIN 41591; 09-1976Patent Document 5: Japanese Patent Laid-Open No. 2006-010 004 APatent Document 6: Japanese Patent Laid-Open No. 2016-065 595 ASUMMARY OF THE INVENTIONPROBLEMS TO BE SOLVED BY THE INVENTIONDisadvantageously, in the above-described conventional motor-operated valve, the linear motion shaft chatters relative to a stator, and thus vibration noise is generated.The present invention has been made in view of the foregoing circumstances, and has an object to provide a motor-operated valve that can reduce vibration noise.MEANS FOR SOLVING THE PROBLEMTo achieve the above object, a motor-operated valve according to the present invention includes a motor, a linear motion shaft that receives power of the motor and moves linearly, and that includes a valve element that opens and closes a valve port formed at an end of a valve body, and an elastic member that is provided in the valve body and that contacts the outer circumferential surface of the linear motion shaft and regulates the movement of the linear motion shaft in a radial direction. The motor-operated valve includes a cylindrical receiving member disposed in the valve body having the non-circular hole and receiving the linear movement shaft. Further, the motor-operated valve has a non-circular shaft portion formed in the linear motion shaft, which is loosely fitted to the non-circular hole so as to prevent the linear motion shaft (50) from rotating and whose cross section is non-circular. The cylindrical receiving member has a cylindrical main body portion having the non-circular hole on one end side and a linear motion bearing attached to the other end side of the cylindrical main body portion, and the elastic member is formed of an arc in a shape of an annular ring, and an outer edge portion thereof is received between the cylindrical main body portion and the linear motion bearing.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a side cross-sectional view of a motor-operated valve according to a first embodiment of the present invention. FIG. 2 is a side cross-sectional view of the motor-operated valve in a state where a valve port is open. FIG. 3 is a horizontal cross-sectional view in the vicinity of a cylindrical receiving member. FIG. 4 is a side cross-sectional view in the vicinity of the cylindrical receiving member. FIG. 5 is a side cross-sectional view in the vicinity of the cylindrical receiving member. FIG. 6 is a side cross-sectional view in the vicinity of a teflon sheet. FIG. 7 is a side cross-sectional view of a motor-operated valve according to a variation. FIG. 8 is a horizontal cross-sectional view in the vicinity of an elastic member according to a variation. FIG. 9 is a side cross-sectional view of the motor-operated valve according to a variation. FIG. 10 is a side cross-sectional view of a motor-operated valve according to a variation.MODE FOR CARRYING OUT THE INVENTION[First Embodiment]The first embodiment of the present invention will be described below with reference to Figs. 1 to 6. As shown in FIG. 1, a motor-operated valve 10 of the present embodiment includes a stator 11, a rotor 40 rotatably accommodated inside the stator 11, and a linear motion shaft 50 linearly moving inside the stator 11 by the rotation of the rotor 40.The stator 11 is formed by fixing a stator-side field portion 13 to the outside of the valve body 11B. The stator-side field portion 13 is formed in the shape of an annular ring and has electromagnetic coils 13A arranged in line with each other.The valve body 11B has a sleeve 12 extending vertically. The sleeve 12 is formed of an upper cylindrical portion 14 and a lower cylindrical portion 15, and the upper cylindrical portion 14 and the lower cylindrical portion 15 are coaxially arranged. The upper cylindrical portion 14 is formed in the shape of a cylinder having substantially the same diameter in its entirety, and an opening in its upper surface is hermetically sealed with a lid member 23. The stator-side field portion 13 described above is fixed to a lower end portion of the upper cylindrical portion 14.As shown in FIG. 1, the lower cylindrical portion 15 includes a valve element linear motion portion 15X that extends from a lower end portion to an intermediate portion, a bearing receiving portion 15Y that is located above the valve element linear motion portion 15X and that has a larger inner diameter than the valve element linear motion portion 15X, and an upper end receiving portion (upper end receiving portion) 15Z that is located above the bearing receiving portion 15Y and that has a larger inner diameter than the bearing receiving portion 15Y. Among them, the lower end portion of the upper cylindrical portion 14 is fitted to the upper end receiving portion 15Z, and thus the upper cylindrical portion 14 and the lower cylindrical portion 15 are coupled to each other. The upper cylindrical portion 14 and the lower cylindrical portion 15 are welded to each other in a state in which the lower end surface of the upper cylindrical portion 14 abuts against an annular step portion 15D that is the inner surface of the upper end receiving portion 15Z, and a flange 15F that extends laterally from the upper end of the lower cylindrical portion 15 contacts the lower end surface of the stator side field portion.An opening portion 16 is formed in a lower end portion of the lower cylindrical portion 15, and a cylindrical portion 17 protrudes upward from the opening edge of the opening portion 16 toward the valve element linear motion portion 15X. The opening at the upper end of the cylindrical portion 17 serves as a valve port 18. A first flow path R 1 is connected to the opening portion 16, and a second flow path R 2 is connected to the side port 15B.As shown in FIG. 1, the rotor 40 is formed by fixing a rotor-side field portion 41 having magnetic characteristics to the outside of a rotary cylindrical screw cylinder 42 whose both ends are opened. The rotor-side field portion 41 and the stator-side field portion 13 are used as a main portion so as to constitute a stepping motor 20 corresponding to a "motor" in the present invention, and the excitation pattern of the electromagnetic coils 13A in the stator-side field portion 13 changes with the result that the rotor-side field portion 41 is positioned at a predetermined rotational position.Between the upper end portion of the rotor 40 and the lid member 23, and between the lower end portion of the rotor 40 and the lower cylindrical portion 15, bearings 35 and 36 are respectively disposed. The bearings 35 and 36 are ball bearings that respectively hold a plurality of balls 35C and 36C between outer ball shells 35A and 36A and inner ball shells 35B and 36B so that the balls 35C and 36C can be rolled.In the upper bearing 35, the outer ball cup 35A is fixed to the upper end portion of the rotary screw cylinder 42 in the rotor 40, and the inner ball cup 35B is fixed to the lid member 23. Specifically, in the lid member 23, a cylindrical portion 23T protruding downward is formed, and the inner ball cup 35B is fitted to the outside of the cylindrical portion 23T. In the interior of the rotary screw cylinder 42 in the rotor 40, a step portion 42D is formed whose upper end portion is formed so as to increase in diameter in a stepped manner, and the outer ball cup 35A is fitted to the step portion 42D.In the upper bearing 36, the outer ball cup 36A is fixed to the lower cylindrical portion 15 of the valve body 11B, and the inner ball cup 36B is fixed to the lower end portion of the rotary screw cylinder 42 of the rotor 40. Specifically, the outer ball cup 36A is fitted to the bearing receiving portion 15Y of the lower cylindrical portion 15. In the outer wall of the rotary screw cylinder 42 in the rotor 40, a step portion 42E is formed whose lower end portion is formed so as to reduce in diameter in a stepped manner, and the inner ball cup 36B is fitted to the step portion 42E.Between the cover member 23 and the inner ball shell 35B of the upper ball bearing 35, a spring ring 37 for preventing chatter is disposed. Accordingly, the rotor 40 rotates with respect to the stator 11 in a state where the rotor 40 is positioned in a radial direction and in an axial direction.In addition, in the rotor-operated valve 10, members described below are provided to control the amount of rotation of the rotor 40. That is, as shown in FIG. 1, in the valve body 11B, a guide shaft 30 that depends (hangs down) from the lid member 23 is provided. A spiral guide 31 is fixed to the guide shaft 30. The spiral guide 31 is formed by winding wires spirally around a lower end portion of the guide shaft 30.A stopper ring 32 is engaged with the spiral guide 31. The stopper ring 32 is formed in the shape of a ring held in a part of a gap between the wires of the spiral guide 31 adjacent to each other in the axial direction, and has a stopper arm 32A extending sideways. On the inner surface of the rotary screw cylinder 42 of the rotor 40, ring contact portions 42S (only the ring contact portion 42S on the rear side is shown in FIG. 1 ) are formed. The ring contact portions 42S are disposed above the female threaded portion 42N and extend in the vertical direction so as to receive the stopper arm 32A therebetween. When the rotor 40 rotates, the stopper ring 32 is pressed by the ring contact portions 42S, rotated relative to the spiral guide 31, moved up and down, and becomes non-rotatable as it moves toward the upper end portion or the lower end portion of the spiral guide 31. In this manner, the amount of rotation of the rotor 40 is controlled.As shown in FIG. 1, the female screw portion 42N is formed on the inside of the rotary screw cylinder 42 in the rotor 40 at a position near its lower end. The linear motion shaft 50 is screwed into the female screw portion 42N. The linear motion shaft 50 has, at its upper end portion, an externally threaded portion 50N (corresponding to a "screw portion" in the present invention) screwed into the internally threaded portion 42N of the rotor 40, and has, at its lower end portion, a valve element 60 that opens and closes the valve port 18. The valve element 60 is formed in the shape of a truncated cone whose diameter decreases toward an end tip portion. The valve element 60 is accommodated in the valve port 18 from above, as shown in FIG. 1, comes into contact with a valve seat 19, thereby closing the valve port 18 and regulating the flow. Then, as shown in FIG. 2, the valve element 60 moves upward, and thus the valve port 18 opens, with the result that the flow between the first flow path R 1 and the second flow path R 2 becomes possible.The linear motion shaft 50 is held linearly movable and non-rotatable with respect to the lower cylindrical portion 15, and the linear motion shaft 50 is linearly moved in the vertical direction by being screwed into the rotary screw cylinder 42 in accordance with the rotation of the rotor 40. The holding mechanism of the linear motion shaft 50 will be described in detail below.As shown in FIGS. 1 and 3, in the linear motion shaft 50, between the male screw portion 50N and the valve element 60, a slide shaft portion 50B (corresponding to a "non-circular shaft portion" in the present invention) whose cross section is formed in the shape of the letter D and a circular shaft portion 50G whose cross section is circular are formed and vertically lined up. As shown in FIG. 4, the slide shaft portion 50B and the circular shaft portion 50G are accommodated in a cylindrical accommodation member 25 provided in the valve body 11B. The accommodating cylindrical member 25 is formed at the upper end portion of the valve element linear motion portion 15X in the lower cylindrical portion 15, and is attached to an accommodating portion 15G having a larger inner diameter than the valve element linear motion portion 15X. Two communication holes 15A are formed in the peripheral portion of the accommodating portion 15G (see FIG. 3 ), and a gap S is further provided between the outer surface of the lower end portion of the accommodating cylindrical member 25 and the inner surface of the lower cylindrical portion 15 (specifically, the inner surface of the valve element linear motion portion 15X). In this manner, the pressures of the upper and lower spaces separated from the cylindrical receiving member 25, that is, the pressure of a portion of a space inside the valve body 11B in which the valve member 60 vertically moves and the pressure inside the stepping motor 20 become substantially equal.The cylindrical receiving member 25 has a cylindrical main body portion 26 formed in the shape of a cylinder. In the cylindrical main body portion 26, its inside is a circular hole 26E whose cross section is circular and its inner diameter is slightly larger than the outer diameter of the circular shaft portion 50G of the linear motion shaft 50, at the upper end of the cylindrical main body portion 26, an extending portion 26A is provided which extends inward from the opening edge of the circular hole 26E, and at its center, a shaft receiving hole 26D (serving as a "non-circular hole" in the present invention) corresponding to the sliding shaft portion 50B and in the shape of the letter D is formed. As shown in FIGS. 4 and 5, in the linear motion range of the linear motion shaft 50, the shaft receiving hole 26D contacts only the sliding shaft portion 50B, thereby regulating the rotation of the linear motion shaft 50.As shown in FIG. 6, at the lower end portion of the cylindrical main body portion 26, an annular protrusion wall 26C (corresponding to a "protrusion wall" in the present invention) is formed, which protrudes downward from an outer periphery portion. In a state where a linear motion bearing 27 is accommodated inside the annular protrusion wall 26C, a tip end portion 26U of the annular protrusion wall 26C is round-hammered and bent inward, and thus the linear motion bearing 27 is non-rotatably fixed to the cylindrical main body portion 26.The linear motion bearing 27 is formed in the shape of a cylinder as in the cylindrical main body portion 26, and its inner diameter is larger than the outer diameter of the circular shaft portion 50G but smaller than the inner diameter of the circular hole 26E in the cylindrical main body portion 26.Here, in the motor-operated valve 10 of the present embodiment, the cylindrical receiving member 25 is provided with a teflon arc 28 (corresponding to an "elastic member" in the present invention) that contacts an outer circumferential surface 50M of the circular shaft portion 50G in the linear motion shaft 50.The Teflon sheet 28 is formed in the shape of an annular plate and has an inner diameter smaller than the outer diameter of the circular shaft portion 50G of the linear motion shaft 50, The Teflon sheet 28 is installed simultaneously when the linear motion bearing 27 is installed in the cylindrical main body portion 26, and an outer edge portion is sandwiched between the cylindrical main body portion 26 and the linear motion bearing 27. Specifically, the teflon sheet 28 is inserted into the cylindrical main body portion 26 from the tip end portion 26U side of the annular protrusion wall 26C, and is sandwiched between the lower end surface 26H and an upper end surface 27H of the linear motion bearing 27 in a state where the teflon sheet 28 is disposed on a lower end surface 26H from which the annular protrusion wall 26C of the cylindrical main body portion 26 protrudes. At this time, since the movement of the teflon sheet 28 in the radial direction is regulated by the annular protrusion wall 26C, the teflon sheet 28 is unlikely to slide. Both the lower end surface 26H of the cylindrical main body portion 26 and the upper end surface 27H of the linear motion bearing 27 are chamfered so as to be inclined upward as they extend inward, and the inner edge portion of the teflon sheet 28 extends inward from the inner surface of the linear motion bearing 27 and is inclined upward. When the linear motion shaft 50 is inserted into the cylindrical receiving member 25 from the linear motion bearing 27 side, as shown in FIG. 6, the inner edge portion of a surface 28A of the teflon sheet 28 on the side facing the linear motion bearing 27 contacts an outer circumferential surface M of the circular shaft portion 50G in the linear motion shaft 50, and the inner edge portion of a spherical surface 28B on the side facing the cylindrical main body portion 26 contacts the inner surface of the circular hole 26E in the cylindrical main body portion 26.The configuration of the present embodiment has been described above. Next, the operations and effects of the present embodiment will be described. The motor-operated valve 10 of the present embodiment is installed in a body 100, for example (see FIG. 1 ). And the rotor 40 rotates by receiving the excitation of the stator-side field portion 13, thus the linear motion shaft 50 having the valve element 60 moves linearly by being screwed into the rotary screw cylinder 42 of the rotor 40, and the opening degree of the valve changes. Accordingly, the flow rate of a coolant flowing between the first flow path R 1 and the second flow path R 2 changes.Here, since the valve body 11B is provided with the teflon sheet 28 contacting the outer circumferential surface 50M of the linear motion shaft 50 in the motor-operated valve 10 of the present embodiment, it is possible to prevent the linear motion shaft 50 from chatter in the radial direction, and thus it is possible to reduce vibration noise.Also, since the bearings 35 and 36 are disposed between the stator 11 and the rotor 40, the rotor 40 is prevented from chatter in the radial direction, with the result that it is possible to further reduce vibration noise. Further, since the rotor 40 is also positioned in the axial direction of the spring ring 37 for preventing the chattering of the bearings 35 and 36, the rotor 40 is prevented from chatter in the axial direction, with the result that it is possible to further reduce vibration noise.Assuming a configuration in which the teflon sheet 28 contacts the sliding shaft portion 50B whose cross section is formed in the shape of the letter D in the linear movement shaft 50, it can be considered that the teflon sheet 28 wears by making sliding contact with the corner of the letter D. However, in the present embodiment, the teflon sheet 28 is configured to contact the circular shaft portion 50D whose cross section is circular, and thus it is also possible to prevent the teflon sheet 28 from being worn.The teflon sheet 28 is attached to the cylindrical receiving member 25 that prevents the linear movement shaft 50 from rotating and supports the linear movement thereof, and thus it is possible to reduce the number of components compared with a configuration in which the cylindrical receiving member 25 and members for fixing the teflon sheet 28 are individually provided. Further, when the linear motion bearing 27 is attached to the cylindrical main body portion 26, the teflon sheet 28 is attached simultaneously, and thus it is possible to reduce the working time. Moreover, the cylindrical receiving member 25 is provided as a member separate from the lower cylindrical portion 15, and thus it can be seen that it becomes easy to assemble the motor-operated valve 10.[Other Embodiments]The present invention is not limited to the above-described embodiment, and for example, embodiments described below are also included in the technical scope of the present invention, and further, various variations other than those described below can be realized without departing from the basic idea thereof.(1) Although in the above-described embodiment, the rotary screw cylinder 42 of the rotor 40 is fixed to the outer ball shell 35A in the upper bearing 35 and is fixed to the inner ball shell 36B in the lower bearing 36, they may be opposedly fixed as shown in FIG. 7, both may be fixed to the outer ball shells 35A and 36A, or both may be fixed to the inner ball shells 35B and 36B.(2) Although in the above-described embodiment, the teflon sheet 28 contacts the entire outer circumferential surface 50M of the circular shaft portion 50G in the linear motion shaft 50, the inner edge of the teflon sheet 28 may take a configuration such that it is formed in a waveform such that it intermittently contacts the outer circumferential surface 50M of the linear motion shaft 50, as shown in FIG. 8(A). Also, as shown in FIG. 8(B), a configuration may be adopted in which, for example, hemispherical recessed accommodation portions 27J are provided on the opening edge of the upper end surface 27H of the linear motion bearing 27, and in which spherical surfaces 28B (corresponding to the "elastic members" in the present invention) made of an elastomer are disposed in the recessed accommodation portions 27J. Although the accommodation recessed portions 27J and the spherical surfaces 28B may be provided at two locations as shown in FIG. 8(B), they are preferably provided uniformly at three locations in the circumferential direction of the linear motion shaft 50. In the case of the above-described example, even if the communication holes 15H and the gap S are not provided, the pressures of the upper and lower spaces separated from the cylindrical receiving member 25 are substantially equal.(3) Although in the above-described embodiment, the movement of the rotor 40 in the radial direction is controlled by the bearings 35 and 36, for example, as shown in FIG. 9, a configuration may be adopted in which the regions where the lower end portion of the rotor 40 and the lower cylindrical portion 15 come into contact with each other taper and the movement of the rotor 40 in the radial direction is controlled. Although FIG. 9 shows an example in which the lower end portion of the rotor 40 and the lower cylindrical portion 15 are tapered and in which the bearing 35 is provided between the upper end portion of the rotor 40 and the lid member 23, the bearing 35 may be provided reversely between the lower end portion of the rotor 40 and the lower cylindrical portion 15 such that the upper end portion of the rotor 40 and the lid member 23 are tapered, or both the lower end portion of the rotor 40 and the lower cylindrical portion 15 and the upper end portion of the rotor 40 and the lid member 23 may be tapered.(4) Although in the above-described embodiment, the valve element 60 is disposed on the side closer to the stepping motor 20 than the valve port 18 so as to come into contact with the valve port 18 from above, the valve element 60 may take a configuration such that it is disposed on the side opposite to the stepping motor 20 opposite to the valve port 18 so as to come into contact with the valve port 18 from below.(5) Although in the above-described embodiment, the slide shaft portion 50B and the circular shaft portion 50G are disposed in the linear movement shaft 50 between the male screw portion 50N and the valve element 60, and the cylindrical receiving member 25 is disposed between the valve port 18 and the rotor 40, a configuration may be adopted in which the slide shaft portion 50B and the circular shaft portion 50G are disposed over the male screw portion 50N, and in which the cylindrical receiving member 25 is disposed over the rotor 40.(6) Although in the above-described embodiment, the slide shaft portion 50B is disposed on the upper side in the linear motion shaft 50 and the circular shaft portion 50G is disposed on the lower side, they may be disposed opposite to each other. In other words, as shown in FIG. 10, the male screw portion 50N, the circular shaft portion 50G, the slide shaft portion 50B, and the valve element 60 may be arranged in this order from above. In this case, in the cylindrical receiving member 25, the shaft receiving hole 26D contacting the sliding shaft portion 50B is disposed on the lower side, and the linear motion bearing 27 and the teflon sheet 28 making sliding contact with the circular shaft portion 50G or contacting the circular shaft portion 50G are disposed on the upper side.(7) Although in the above-described embodiment, the teflon sheet 28 is inclined upward as it extends inwardly, the teflon sheet 28 may take a configuration such that it is inclined downward as it extends inwardly. The inner circumferential surface of the teflon sheet 28 may take a configuration to contact the outer circumferential surface 50M of the circular shaft portion 50G in the linear motion shaft 50.(8) Although in the above-described embodiment, the tip end portion 26U of the annular protrusion wall 26C is round-hammered so as to bend inward, and thus the linear motion bearing 27 is held in the cylindrical main body portion 26, the linear motion bearing 27 may take a configuration such that it is press-fitted into the cylindrical main body portion 26,DESCRIPTION OF REFERENCE REFERENCES10 Motor-operated valve 11 Stator 11B Valve body 18 Valve port 20 Stepping motor (motor) 25 Cylindrical receiving member 26 Cylindrical main body portion 26D Shaft receiving hole (non-circular hole) 27 Linear motion bearing 28 Teflon sheet (elastic member) 40 Rotor 50 Linear motion shaft 50B Sliding shaft portion (non-circular shaft portion) 50G Circular shaft portion 50M Outer peripheral surface 60 Valve element

Claims

A motor-operated valve (10) comprising: a motor (20); a linear motion shaft (50) that receives power of the motor (20) and moves linearly and that has a valve element (60) that opens and closes a valve port (18) formed at an end of a valve body (11B); and a cylindrical receiving member (25) disposed in the valve body (11B), the cylindrical receiving member (25) having a non-circular hole (26D) and receiving the linear motion shaft (50); an elastic member (28) disposed in the cylindrical receiving member (25) and that contacts an outer circumferential surface of the linear motion shaft (50) and controls movement of the linear motion shaft (50) in a radial direction; and a non-circular shaft portion (50B) formed in the linear motion shaft (50) loosely fitted to the non-circular hole (26D) formed in the valve body (11B) so as to prevent the linear motion shaft (50) from rotating and whose cross section is non-circular; wherein the receiving cylindrical member (25) has a main cylindrical body portion (26) having the non-circular hole (26D) on one end side and a linear motion bearing (27) attached to the other end side of the main cylindrical body portion (26), and wherein the elastic member (28) is formed of an arc in a shape of an annular ring, and an outer edge portion thereof is received between the main cylindrical body portion (26) and the linear motion bearing (27).The motor-operated valve (10) according to claim 1, including: a rotor (40) of the motor (20) that rotates with respect to the valve body (11B) in a state where the rotor (40) is positioned in a direction of a rotation axis and that screws into the linear motion shaft (50); and a circular shaft portion (50G) that is formed in the linear motion shaft (50) and whose cross section is circular, wherein the linear motion shaft (50) moves linearly only in a range where the elastic member (28) contacts the circular shaft portion (50G).The motor-operated valve (10) according to claim 1, wherein the non-circular shaft portion (50B) and the circular shaft portion (50G) are arranged to be lined up between the valve element (60) and a screw portion in the linear motion shaft (50) screwed into the rotor (40), the cylindrical receiving member (25) is arranged between the valve port (18) and the rotor (40) in the valve body (11B), and the elastic member (28) is attached to the cylindrical receiving member (25).The motor-operated valve (10) according to claim 1, comprising: a projection wall (26C) which projects from an outer peripheral edge of the other end portion of the cylindrical main body portion (26) and which non-rotatably holds the linear motion bearing (27) therebetween.

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