JP2017003033A - Rotary valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary valve capable of reducing the number of components and the number of man-hours for assembly, enabling downsizing, and capable of easily and properly engaging a gear (for example, a worm) on a motor side and a gear (for example, a worm wheel) in assembly.SOLUTION: A rotary valve includes: a motor 15; a valve body 20; a reduction gear train 40 configured to transmit rotation drive force of the motor 15 to the valve body 20; a valve housing 10 that has a motor chamber 16 housing the motor 15, and a valve chamber 12 housing the valve body 20 in a rotatable manner, and of which the upper surface is opened; and a single drive part support plate 30 into which the motor 15, the valve body 20 and the reduction gear train 40 are directly assembled, and that is fixed to the valve housing 10.SELECTED DRAWING: Figure 11

Description

  The present invention provides various forms such as a flow path switching valve (multi-way valve), a flow rate adjustment valve, a pressure control valve, an on-off valve, etc., which are configured to rotate a valve element through a transmission mechanism comprising a reduction gear train by a motor. In particular, the present invention relates to a rotary valve suitable for use in a system in which a circulating fluid is hot water, hot water, or cooling water.

  This type of rotary valve is provided with, for example, a motor unit including a motor and a reduction gear train, a valve chamber and a plurality of ports, and a valve body rotates in the valve chamber, as described in Patent Document 1, for example. Generally, a valve housing (valve body) that is freely distributed is manufactured separately, and then a motor unit is assembled to the valve housing.

  However, in the rotary valve having such a configuration, a member for supporting the rotating portion and a member for connecting them to each other are required on the motor unit side and the valve housing side, respectively, and the total number of parts and assembly man-hours are increased. In addition, there is a problem that it is difficult to reduce the size.

  Therefore, some rotary valves incorporate a motor, a reduction gear train, and the like in the valve housing.

JP 2001-200987 A

  However, it is known that a conventional rotary valve in which a motor, a reduction gear train, and the like are incorporated in a valve housing has the following problems.

  In other words, in a conventional rotary valve, a motor having a gear fitted to the output shaft is fixed to a support plate different from some of the gears constituting the reduction gear train, and the support plate to which the motor is assembled is attached to the valve housing. Then, a support plate on which some of the gears constituting the reduction gear train are assembled is attached to the valve housing. This is presumed mainly for the convenience of meshing between a gear (for example, a worm) on the motor side and a gear (for example, a worm wheel) meshed therewith, but a support plate for supporting the motor And the support plate for supporting (a part of) the gear train are made different from each other and are individually attached to the valve housing. Therefore, there is a possibility that the number of parts and the number of assembling steps may be increased.

  The present invention has been made in view of the above-described problems. The object of the present invention is to reduce the number of parts and the number of assembling steps, to reduce the size, and to provide a motor-side gear (for example, a worm) during assembly. ) And a gear (for example, a worm wheel) meshing with the rotary valve can be easily and properly meshed with each other.

  In order to achieve the above object, a rotary valve according to the present invention basically includes a motor, a valve body, a transmission mechanism for transmitting the rotational driving force of the motor to the valve body, and the motor. A motor housing and a valve housing in which the valve body is rotatably accommodated, a valve housing having an open upper surface, and the motor, the valve body, and the transmission mechanism are directly assembled to the valve housing. And a single driving unit supporting plate fixed thereto.

  In a preferred aspect, the drive unit support plate is placed and fixed on a mounting surface located above the motor chamber and the valve chamber in the valve housing.

  In another preferred embodiment, the motor is mounted and fixed to the lower surface side of the drive unit support plate in a state where a gear that forms the foremost stage of the transmission mechanism is provided on the output shaft and protrudes to the upper surface side. At the same time, the valve body is rotatably fitted in a state in which a gear that constitutes the last stage of the transmission mechanism, which is externally fitted and fixed to the shaft portion, protrudes to the upper surface side.

  In another preferred aspect, the rotation axis of the motor and the rotation axis of the valve body are arranged in parallel to each other at a predetermined distance.

  The transmission mechanism preferably includes a worm gear train including a worm provided on the output shaft of the motor and a worm wheel meshing with the worm.

  The transmission mechanism is preferably provided on a first worm gear train including a first worm provided on an output shaft of the motor and a first worm wheel meshing with the first worm, and on a rotating shaft portion of the first worm wheel. And a second worm gear train including a second worm wheel meshed with the second worm wheel and fitted around the shaft portion of the valve body.

  In another preferred aspect, the motor is moved from the side of the drive unit support plate between the through hole of the output shaft of the motor and the outer end surface of the drive unit support plate with the output shaft facing upward. A slit-shaped notch is formed for lateral movement to the through hole.

  In another preferable aspect, the cover has a cover that covers the upper surface opening of the valve housing, and the sealing material is sandwiched between the outer peripheral upper end surface of the valve housing and the outer peripheral lower end surface of the cover that is in contact with the cover. Retained.

  In a further preferred aspect, the sealing material has an endless annular shape.

  In another preferred embodiment, a pair of bearing grooves having an open top surface are provided on the top surface side of the drive unit support plate so as to rotatably support both end portions of the rotating shaft portion of the worm wheel constituting the transmission mechanism. A columnar bearing portion projects upward, and the lower end surface of the columnar bearing portion is the upper end surface of the columnar bearing portion so as to prevent the cover from being lifted at both ends of the rotating shaft portion rotatably supported by the bearing groove. A pair of columnar pressing portions that are brought into contact with each other are protruded downward.

  In a preferred embodiment, the valve body includes a cylindrical valve body portion having an opening formed on a peripheral surface, an intermediate shaft portion projecting on the cylindrical valve body portion and having a smaller diameter than the cylindrical valve body portion, and the intermediate And an upper shaft portion projecting on the shaft portion to which a gear constituting the last stage of the transmission mechanism is fitted and fixed.

  In another preferred aspect, the drive part support plate is provided with a shaft fitting insertion hole formed of a cylindrical part having a predetermined thickness into which the intermediate shaft part of the valve body is rotatably fitted. The valve body is secured to the drive unit support plate by a lower surface of a gear externally fitted and fixed to the upper shaft part, an upper step surface of the cylindrical valve body part, and an upper end surface and a lower end face of the shaft fitting insertion hole, and The vertical position is restricted.

  The valve housing preferably has a cylindrical body portion in which the valve chamber is formed and at least one port is provided on an outer periphery thereof, and the upper surface side of the cylindrical body portion includes the A circular opening is formed for inserting the valve element retained in the shaft fitting insertion hole of the drive unit support plate into the valve chamber from above.

  In another preferred embodiment, a lower port member having a port having an open upper surface is fixedly fitted inside the cylindrical body portion of the valve housing below the valve chamber.

  In the rotary valve according to the present invention, a motor, a valve body, and a transmission mechanism (for example, a reduction gear train) are directly assembled to a single drive unit support plate, and the drive unit support plate is fixed to the valve housing. The motor and the valve body are assembled to the lower surface side of the single drive unit support plate, and the transmission mechanism is assembled to the upper surface side of the drive unit support plate, that is, the motor, the transmission mechanism, and the valve body. The rotary valve is assembled by housing the unit in the valve housing and mounting and driving the driving unit support plate on an attachment surface provided in the valve housing. Therefore, the number of parts and assembly are lower than those in which the motor unit is assembled to the valve housing as in the past and in which the motor and some of the gears constituting the reduction gear train are assembled to different support plates. Man-hours can be reduced and downsizing can be achieved.

  In addition, a slit-shaped notch is formed between the through hole of the output shaft of the motor and the outer end surface of the drive unit support plate, so that the motor can be mounted on the drive unit support plate with the output shaft facing upward. A gear (for example, a worm) provided on the output shaft is moved laterally from the side to the through hole, and a gear (for example, a worm) provided on the output shaft is finely adjusted in the vertical and rotational positions. ) Can be meshed from the side with a gear (for example, a worm wheel) supported by the drive unit support plate, so that both can be meshed easily and appropriately.

The whole perspective view showing the appearance of one embodiment of the rotary valve concerning the present invention. The perspective view which shows the state which removed the cover in the rotary valve of the said one Embodiment. Sectional drawing which follows the XX arrow line of FIG. Sectional drawing according to the YY arrow line of FIG. The perspective view which shows the drive part support plate of the said one Embodiment. The perspective view which shows the state which assembled | attached the motor, the valve body, and the reduction gear train to the drive part support plate of the said one Embodiment. The perspective view with which it mainly uses for description of the components assembly | attachment procedure (1) of the rotary valve of the said one Embodiment. The perspective view with which it mainly uses for description of the components assembly | attachment procedure (2) of the rotary valve of the said one Embodiment. The perspective view with which it mainly uses for description of the components assembly | attachment procedure (3) of the rotary valve of the said one Embodiment. The perspective view with which it mainly uses for description of the components assembly | attachment procedure (4) of the rotary valve of the said one Embodiment. The perspective view with which it mainly uses for description of the components assembly | attachment procedure (5) of the rotary valve of the said one Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 is an overall perspective view showing an external appearance of an embodiment of a rotary valve according to the present invention, FIG. 2 is a perspective view showing a state where a cover of the rotary valve is removed, and FIGS. It is sectional drawing which follows XX and a YY arrow line. In the present specification, descriptions representing positions and directions such as up and down, left and right, and front and rear are based on the direction arrow indications of FIGS. 1 and 2, and do not indicate the positions and directions in the actual use state. .

  The rotary valve 1 of the illustrated embodiment is used as a flow path switching valve (three-way valve) in a system in which a circulating fluid is hot water, hot water, or cooling water, such as a hot water supply facility. 15 (FIG. 6), a valve body 20 (FIG. 6) in which the rotational driving force of the motor 15 is transmitted via a reduction gear train (transmission mechanism) 40, which will be described later, and a motor chamber 16 ( 11) and a valve chamber 12 (FIGS. 3 and 11), in which the valve body 20 is rotatably accommodated, is generally provided in the lower half of the valve housing 10, and a motor in the valve housing 10 is opened. A single (consisting of one member) mounted on the mounting surface 14 which is the upper surface of the chamber 16 and the valve chamber 12 and fastened and fixed to the valve housing 10 with tapping screws 38 and 38 (FIGS. 2 and 3). A drive unit support plate 30; It is covered so as to cover the upper opening of the housing 10 and a cover 45 which is fastened by set screws 19 a predetermined number.

  In detail, the valve housing 10 has a cylindrical body 11 in which a valve chamber 12 is formed, and outflow ports p1 and p2 made of joints are provided on the right side and the front side of the outer periphery, respectively. As will be described later, the valve body 20 (the cylindrical valve body portion 21) retained in the shaft fitting insertion hole 32 of the drive unit support plate 30 is inserted into the valve chamber 12 from above on the upper surface side of the cylindrical body portion 11. A circular opening 17 (FIGS. 3 and 11) is formed.

  In addition, a lower port member 18 having an inflow port p3 formed of a joint having an upper surface opened in a stepped cylindrical portion below the valve chamber 12 in the cylindrical body portion 11 of the valve housing 10 has an O as a sealing member therebetween. The ring 39 is sandwiched and fixed by ultrasonic welding or the like.

  A cylindrical rubber seal member 27 having a plurality of oval openings 28 formed at predetermined angular intervals is formed on the outer periphery of the valve chamber 12 before the lower port member 18 is fitted and fixed. It is inserted from the lower side, and is fixed by an appropriate method so as to prevent follow-up by the valve body 20. On the inner peripheral side of the rubber seal member 27, the cylindrical valve body portion 21 of the valve body 20 is pushed into the press-fit state from above through the circular opening 17, that is, for sealing with the rubber seal member 27. The rubber seal member 27 is inserted so as to be slidable and rotatable while compressing the rubber seal member 27 to such an extent that a necessary compression allowance can be secured.

  On the other hand, in the present embodiment, as shown in FIG. 6, the rotation axis O ′ of the motor 15 and the rotation axis O of the valve body 20 are arranged in parallel with each other with a predetermined distance therebetween. Is provided with a rectangular tubular body 13 having a motor chamber 16 formed therein.

  For the reduction gear train 40 interposed between the motor 15 (the output shaft 15A thereof) and the valve body 20 (the upper shaft portion 23 thereof), refer to FIG. 2, FIG. 6, FIG. As can be seen, a first worm gear train comprising a first worm 41 (fitted and fixed) provided on the output shaft 15A of the motor 15 and a first worm wheel 42 meshing therewith, and the first worm wheel 42. A second worm gear train comprising a second worm 43 provided on the rotary shaft portion 42A of the first and second worm wheels 44 engaged with and fixed to an upper shaft portion 23 (described later) of the valve body 20 which meshes with the second worm 43. The reduction ratio is about 1/100, for example.

  Then, on the lower surface side of the drive unit support plate 30, the motor 15 has the upper end surface of the main body unit 15 </ b> B as the drive unit support plate, as can be understood by referring to FIG. 2, FIG. 5, FIG. 30 and a set screw 37 screwed from above in a state where the first worm 41 provided on the output shaft 15A (FIG. 10) protrudes from the through hole 35 (FIG. 5) to the upper surface side. 37 is fixedly attached.

  Further, in order to facilitate the assembly of the motor 15 (and the reduction gear train 40) to the drive unit support plate 30, in other words, the engagement between the first worm 41 and the first worm wheel 42, the drive unit support plate 30 As shown in FIGS. 5 and 6, between the through hole 35 of the output shaft 15 </ b> A of the motor 15 and the outer end surface, the motor 15 is positioned with the output shaft 15 </ b> A to which the first worm 41 is fixed facing upward. A slit-shaped notch 36 is formed for laterally moving the drive unit support plate 30 from the side to the through hole 35.

  Further, on the upper surface side of the drive unit support plate 30, there is a bearing groove 33 a that rotatably supports both end portions 42 a, 42 a of the rotation shaft portion 42 </ b> A of the first worm wheel 42 and whose bottom surface is semicircular in cross section and whose upper surface is open. A pair of provided columnar bearing portions 33, 33 are provided so as to protrude upward. Here, as shown in FIG. 4, the upper end surface of the columnar bearing portion 33 (bearing groove 33a) is substantially flush with or slightly above the upper end surfaces (top surfaces) of both end portions 42a, 42a of the rotating shaft portion 42A. To be located. Further, as shown in FIG. 4, the cover 45 has both end portions 42a of a rotating shaft portion 42A rotatably supported in bearing grooves 33a, 33a of columnar bearing portions 33, 33 provided in the front-rear direction. In order to prevent 42a from being lifted up, a pair of columnar pressing portions 46, 46, whose lower ends are brought into contact with the upper end surfaces of the columnar bearing portions 33, 33 and whose interiors are hollow, protrude downward. In other words, the columnar bearing portions 33 and 33 provided on the drive unit support plate 30 and the columnar pressing portions 46 and 46 provided on the cover 45 serve to rotate the rotation shaft portion 42A of the first worm wheel 42 and the second worm 43. A supporting bearing is configured.

  In addition, a predetermined meat protruding above and below the base plate portion 31 is located on the right front side of the through hole 35 in the drive unit support plate 30 as can be understood by referring to FIGS. 5 and 7 in addition to FIG. A shaft fitting insertion hole 32 formed of a cylindrical portion having a thickness is provided.

  On the other hand, the valve body 20 is provided with a cylindrical valve body portion 21 having an oval opening formed on the peripheral surface at an interval of 90 °, and is projected from the cylindrical valve body portion 21, and the shaft fitting insertion hole An intermediate shaft portion 22 having a smaller diameter than the cylindrical valve body portion 21 and rotatably inserted into the cylindrical valve body portion 21, and a second worm projecting on the intermediate shaft portion 22 and constituting the last stage of the reduction gear train 40 As shown in FIG. 3, the second worm wheel 44 has an upper shaft portion 23 having a cross-section racetrack shape and a D-shaped projection 24 to which the wheel 44 is fitted and fixed by press fitting or the like. The bottom surface of the cylindrical valve body 21 and the upper end terrace surface of the cylindrical valve body portion 21 and the upper end surface and the lower end surface of the shaft fitting insertion hole 32 prevent the valve body 20 from being detached from the drive unit support plate 30 and restrict the position in the vertical direction.

  An O-ring 26 as a seal member is interposed between the intermediate shaft portion 22 of the valve body 20 and the inner peripheral surface of the shaft fitting insertion hole 32, and is a circular shape formed on the valve chamber 12. An O-ring 34 as a seal member is also interposed between the opening 17 (the inner peripheral surface thereof) and the outer peripheral surface of the shaft fitting insertion hole 32. Further, here, the diameter of the circular opening 17 is substantially the same as the outer diameter of the cylindrical valve body portion 21 in the valve body 20 and the outer diameter of the cylindrical portion of the shaft fitting insertion hole 32, or the cylindrical valve body portion 21 in the valve body 20. And the outer diameter of the cylindrical portion of the shaft fitting hole 32 is slightly smaller.

  Further, in order to support and hold the printed wiring board 54 (FIG. 3), the driving unit support plate 30 has three support columns 53 with small-diameter convex portions (around the rotating shaft portion 42A of the first worm wheel 42). In addition to being erected, six small-diameter convex portions 56 are also erected on the valve housing 10 (the left front portion thereof).

  Further, as can be understood with reference to FIGS. 2 to 4, an annular formed on the outer peripheral upper end surface of the valve housing 10 to seal between the outer peripheral upper end surface of the valve housing 10 and the outer peripheral lower end surface of the cover 45. A rubber packing 47 as a sealing material having an endless ring is mounted in the groove.

  Next, the procedure for assembling the motor 15, the reduction gear train 40, and the valve body 20 to the drive unit support plate 30 and the installation of the drive unit support plate 30 to the valve housing 10 will be described with reference to FIGS. explain.

  (1) First, as shown in FIG. 7, O-rings 26 and 26 are attached to the outer periphery of the intermediate shaft portion 22 of the valve body 20 (two annular grooves provided on the valve body 20), and An O-ring 34 is attached to the outer periphery (annular groove provided on the lower surface side protruding portion) of the shaft fitting insertion hole 32 constituted by the provided cylindrical portion. Next, as shown in FIG. 8, the intermediate shaft portion 22 of the valve body 20 is pushed into the shaft fitting insertion hole 32, and the upper shaft portion 23 having a cross-section racetrack shape is projected above the shaft fitting insertion hole 32.

  (2) Subsequently, as shown in FIGS. 8 and 9, the last stage of the reduction gear train 40 in which the upper shaft portion 23 is provided with a fitting hole 44 a that can be fitted (press-fitted) to the upper shaft portion 23. The second worm wheel 44 to be configured is fitted and fixed by press fitting or the like. As a result, as described above, the valve body 20 (and the second worm wheel 44) is assembled to the drive unit support plate 30 so as to be rotatable and retained.

  (3) Next, as shown in FIGS. 9 and 10, both end portions 42a and 42a of the rotating shaft portion 42A of the first worm wheel 42 are placed above the bearing grooves 33a and 33a of the columnar bearing portions 33 and 33. Leave it to support. At that time, the position of the second worm wheel 44 fitted and fixed to the upper shaft portion 23 of the valve body 20 and the second worm 43 provided on the rotation shaft portion 42A of the first worm wheel 42 (rotation direction, vertical direction). Engage them while tweaking. In this case, since both the second worm wheel 44 and the second worm 43 can be moved somewhat, they can be engaged easily and appropriately.

  (4) Subsequently, as shown in FIGS. 10 and 6, the motor 15 is placed below the output shaft 15A (the first worm 41) with the output shaft 15A provided with the first worm 41 facing upward. Is inserted into the slit-like notch 36 from the side of the drive unit support plate 30, and the motor 15 with the first worm 41 is moved laterally to the through hole 35, and its position (rotation direction, vertical direction). ), The first worm 41 is engaged with the first worm wheel 42 from the side. In this case, both the first worm 41 and the first worm wheel 42 can be moved somewhat, so that they can be engaged easily and appropriately. When the meshing is completed, the set screws 37, 37 are screwed into the motor 15 (the main body portion 15B) (through the insertion hole provided in the drive unit support plate 30) from the top of the drive unit support plate 30, and the motor 15 ( The upper end surface of the main body portion 15B is attached and fixed in a state where the upper end surface is pressed against the lower surface of the drive unit support plate 30. Thereby, the assembly of the motor 15, the reduction gear train 40, and the valve body 20 to the drive unit support plate 30 is completed (the state shown in FIG. 6 is obtained).

  (5) Next, as shown in FIG. 11, the drive unit support plate 30 in which the motor 15, the reduction gear train 40, and the valve body 20 are assembled is replaced with the valve housing in which the motor chamber 16 and the valve chamber 12 are provided. 10 is placed on the mounting surface 14 which is the upper surface of the motor chamber 16 and the valve chamber 12 and is fastened and fixed to the valve housing 10 with tapping screws 38 and 38 (FIGS. 2 and 3). As a result, the main body portion 15B of the motor 15 and the cylindrical valve body portion 21 of the valve body 20 are accommodated in the motor chamber 16 and the valve chamber 12 defined in the lower half of the valve housing 10, respectively.

  (6) Next, the cover 45 is covered so as to cover the upper surface opening of the valve housing 10 and is fastened and fixed with the set screw 19 (FIGS. 1, 3, and 4). Here, an annular groove is formed on the outer peripheral upper end surface of the valve housing 10, and a rubber packing 47 is attached to the annular groove with a part protruding upward, and the cover 45 is fastened to the valve housing 10. 3 and FIG. 4, when fixed, the rubber packing 47 is sandwiched between the outer peripheral upper end surface of the valve housing 10 and the outer peripheral lower end surface of the cover 45 in contact therewith, and the cover The lower end surface of the columnar pressing portion 46 provided in 45 is in pressure contact with the upper end surface of the columnar bearing portion 33. Thereby, the position of the up-down direction of both ends 42a and 42a of rotating shaft part 42A in the 1st worm wheel 42 is controlled. In other words, the columnar bearing portions 33 and 33 provided on the drive unit support plate 30 and the columnar pressing portions 46 and 46 provided on the cover 45 serve to rotate the rotation shaft portion 42A of the first worm wheel 42 and the second worm 43. The bearing to support is comprised and the 1st worm wheel 42 and the 2nd worm 43 are supported so that it can rotate appropriately, without requiring a shaft holding member etc. separately.

  As understood from the above description, in the rotary valve 1 of the present embodiment, the motor 15, the valve body 20, and the reduction gear train 40 as a transmission mechanism are directly connected to a single drive unit support plate 30 made of one member. The drive unit support plate 30 is fixed to the valve housing 10 while being assembled. In particular, the motor 15 (the main body portion 15B) and the valve body 20 (the cylindrical valve body portion 21) are disposed on the lower surface side of the single drive unit support plate 30, and the reduction gear train 40 is disposed on the upper surface side thereof. The drive unit support plate 30, that is, a unit including the motor 15, the reduction gear train 40, and the valve body 20 is accommodated in the valve housing 10, and the drive unit support plate 30 is provided in the valve housing 10. Since the rotary valve 1 is assembled by being mounted and fixed on the mounting surface 14, a motor unit and a valve housing that are separately assembled, as in the past, Compared to the case where the motor and some of the gears constituting the reduction gear train are assembled on different support plates and then individually mounted on the valve housing, the number of parts and the number of assembly steps are reduced. It is possible to decrease, it can be miniaturized.

  Further, since the slit-shaped notch 36 is formed between the through hole 35 of the output shaft 15A of the motor 15 and the outer end surface, the drive unit support plate 30 with the output shaft 15A facing the motor 15 upward. The first worm 41 is moved to the through hole 35 from the side, and the first worm 41 is adjusted in the vertical and rotational positions of the first worm 41 provided on the output shaft 15A, while the first worm 41 is columnar bearings 33, 33. When the motor 15 is attached to the drive unit support plate 30 and the first worm 41 and the first worm wheel 42 are assembled and assembled, the first worm wheel 42 supported on the side can be meshed from the side. Can be easily and properly engaged with each other.

  Further, the columnar bearing portions 33 and 33 provided on the drive unit support plate 30 and the columnar pressing portions 46 and 46 provided on the cover 45 allow the first worm wheel without requiring a separate shaft pressing member or the like. Since 42 and the second worm 43 are supported so as to be properly rotatable, the number of parts and the number of assembling steps can also be reduced.

  In the above embodiment, the reduction gear train 40 is configured by two sets of worm gear trains. However, the configuration of the reduction gear train 40 as a transmission mechanism is not limited to that of the above embodiment. It is. In addition, the rotary valve 1 of the above embodiment functions as a three-way valve having one inflow port and two outflow ports. As the rotary valve, a multi-way switching valve such as a three-way valve (channel switching) As long as the valve body is rotated by a motor via a transmission mechanism, a flow rate adjustment valve, a pressure control valve, an on-off valve, or the like may be used.

  Moreover, although the rotary valve 1 of the said embodiment shall be used as a three-way valve for flow path switching in a hot water supply equipment, for example in the cooling water circuit (an engine cooling circuit, an electronic device cooling circuit, etc.) in vehicles. You may use as a rotary valve for channel switching.

DESCRIPTION OF SYMBOLS 1 Rotary valve 10 Valve housing 11 Cylindrical trunk | drum 12 Valve chamber 14 Mounting surface 15 Motor 15A Output shaft 16 Motor chamber 17 Circular opening 18 Lower port member 20 Valve body 21 Cylindrical valve body portion 22 Intermediate shaft portion 23 Upper shaft portion 25 Opening 27 Rubber seal member 30 Drive portion support plate 32 Shaft fitting insertion hole 33 Columnar bearing portion 33a Bearing groove 35 Through hole 36 Slit notch 40 Reduction gear train (transmission mechanism)
41 1st worm 42 1st worm wheel 42A Rotating shaft part 43 2nd worm 44 2nd worm wheel 45 Cover 46 Columnar pressing part 47 Rubber packing (seal material)
p1 outflow port p2 outflow port p3 inflow port

Claims (14)

  A motor, a valve body, a transmission mechanism for transmitting the rotational driving force of the motor to the valve body, a motor chamber in which the motor is accommodated, and a valve chamber in which the valve body is rotatably accommodated are provided. A rotary valve comprising: a valve housing having an open upper surface; and a single drive support plate fixed to the valve housing, wherein the motor, the valve body, and the transmission mechanism are directly assembled. .   2. The rotary valve according to claim 1, wherein the drive unit support plate is mounted and fixed on a mounting surface located above the motor chamber and the valve chamber in the valve housing.   On the lower surface side of the drive unit support plate, the motor is mounted on the output shaft, and the gear constituting the foremost stage of the transmission mechanism is mounted and fixed in a state of protruding to the upper surface side, and the valve body is 3. The gear according to claim 1, wherein a gear that is externally fitted and fixed to the shaft portion and that constitutes the last stage of the transmission mechanism is rotatably disposed in a state of protruding to the upper surface side. Rotary valve.   The rotary valve according to any one of claims 1 to 3, wherein the rotation axis of the motor and the rotation axis of the valve body are arranged in parallel with each other with a predetermined distance therebetween.   The said transmission mechanism is comprised including the worm gear train which consists of the worm provided in the output shaft of the said motor, and the worm wheel which meshes with it. Rotary valve.   The transmission mechanism includes a first worm gear train including a first worm provided on an output shaft of the motor and a first worm wheel meshing with the first worm, and a second worm gear provided on a rotation shaft portion of the first worm wheel. 5. The worm gear train according to claim 1, further comprising a second worm gear train including a worm and a second worm wheel meshed with the worm wheel and fitted and fixed to a shaft portion of the valve body. Rotary valve as described in.   The motor is laterally moved from the side of the drive unit support plate to the through hole with the output shaft facing upward between the through hole of the output shaft of the motor and the outer end surface of the drive unit support plate. The rotary valve according to any one of claims 1 to 6, wherein a slit-shaped notch is formed.   A cover that covers the upper surface opening of the valve housing, and a sealing material is sandwiched and held between the outer peripheral upper end surface of the valve housing and the outer peripheral lower end surface of the cover that is in contact with the cover. The rotary valve according to any one of claims 1 to 7, characterized in that:   The rotary valve according to claim 8, wherein the sealing material has an endless annular shape.   On the upper surface side of the drive unit support plate, a pair of columnar bearing portions provided with bearing grooves whose upper surfaces are open and which rotatably support both ends of the rotating shaft portion of the worm wheel constituting the transmission mechanism face upward. In addition to projecting, the lower end surface of the cover is brought into contact with the upper end surface of the columnar bearing portion in order to prevent lifting of both end portions of the rotating shaft portion rotatably supported by the bearing groove. The rotary valve according to claim 8 or 9, wherein the pair of columnar pressing portions project downward.   The valve body includes a cylindrical valve body portion having an opening on a peripheral surface, an intermediate shaft portion projecting on the cylindrical valve body portion and having a smaller diameter than the cylindrical valve body portion, and the intermediate shaft portion. The rotary valve according to any one of claims 1 to 10, further comprising an upper shaft portion that is protruded and on which a gear constituting the last stage of the transmission mechanism is fitted and fixed.   The drive part support plate is provided with a shaft fitting insertion hole made of a cylindrical part having a predetermined thickness into which the intermediate shaft part of the valve body is rotatably fitted, and is fitted on the upper shaft part of the valve body. On the lower surface of the fixed gear, the upper terrace surface of the cylindrical valve body portion, and the upper and lower end surfaces of the shaft fitting insertion hole, the valve body is prevented from coming off from the drive unit support plate and the vertical position is restricted. The rotary valve according to claim 11, wherein the rotary valve is made.   The valve housing has a cylindrical body portion in which the valve chamber is formed and at least one port is provided on an outer peripheral portion thereof, and the driving portion support is provided on an upper surface side of the cylindrical body portion. The rotary valve according to claim 12, wherein a circular opening is formed for inserting the valve element retained in the shaft insertion insertion hole of the plate into the valve chamber from above.   14. The rotary valve according to claim 13, wherein a lower port member having a port having an upper surface opened is fitted and fixed to the lower side of the valve chamber in the cylindrical body portion of the valve housing.

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