JP7214222B2 - Flow switching valve - Google Patents

Description

The present invention relates to flow path switching valves. In particular, the present invention relates to a flow path switching valve in which a case main body of a case that houses a driving portion for driving a valve body and a lid are attached by snap-fitting.

An example of a conventional flow path switching valve is disclosed in Patent Document 1. This flow path switching valve includes a valve body having a valve chamber, a ball-shaped valve body arranged in the valve chamber, a valve shaft connected to the valve body, and a motor that rotates the valve body via the valve shaft. , a rotary drive unit including a drive gear and the like, and a case that accommodates the rotary drive unit.

JP 2018-115691 A

The case of the flow path switching valve described above has a box-shaped case body with an open upper surface, and a lid body that is arranged to block the opening of the case body and screwed to the case body. In such a flow path switching valve, it is conceivable that a plurality of snap-fits having claw portions and claw receiving portions are adopted in place of screwing. By adopting the snap fit, the number of parts can be reduced, and the case main body and the lid can be easily attached.

In a configuration employing a snap fit, the case body and the lid are attached by bringing the case body and the lid close to each other and bending a plurality of snap fits (specifically, claw portions or claw receiving portions) to hook each other. . However, when the case main body and the lid are attached, the force with which each snap fit is deflected may vary. In each snap fit, it is preferable that the hook portion and the hook receiving portion are hooked at the same timing, but due to the above variation, the hooking timing is shifted, and there is a risk that the case main body and the lid body will be attached with their positions shifted. .

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a flow path switching valve that can effectively suppress misalignment between a case body and a lid that are attached by snap fitting.

In order to achieve the above object, a flow path switching valve according to the present invention comprises a valve body, a valve body rotatably accommodated in the valve body, a valve shaft attached to the valve body, and the valve shaft. and a case that is attached to the valve main body and accommodates the drive unit, wherein the case is a box-shaped one open on one side. a case main body, a lid arranged to block the opening, and a plurality of snap-fits for attaching the case main body and the lid, wherein the snap-fits connect the case main body and the lid. A claw portion provided on one side and a claw receiving portion that is provided on the other side and hooked with the claw portion, and one of the case main body and the lid body has a direction in which the case main body and the lid body are attached. The other of the case body and the lid body has a plurality of posts extending in the mounting direction and inserted into the plurality of positioning holes, the posts extending into the case body and the lid, the tip of the post is inserted into the positioning hole before the claw portion of the snap fit and the claw receiving portion are caught, and together with the positioning hole, movement of the lid in the mounting direction is prevented. It is characterized by being formed in a columnar shape so as to guide and restrict movement in a direction perpendicular to the mounting direction .
In the present invention, it is preferable that the case main body has a positioning hole, the lid has the post, and the positioning hole is arranged inside the peripheral wall portion of the case main body.

In the present invention, the bottom wall portion of the case body is provided with a bearing portion that rotatably supports the valve shaft, and the end surface of the valve shaft on the case body side is fitted with a fitting that rotates together with the valve shaft. A rotation angle sensor having a rotor fitted with the fitting shaft portion, and a plate-shaped base body having a sensor support portion for supporting the rotation angle sensor are provided in the case. , and the lid is preferably provided with a recess into which at least the sensor support is fitted.

According to the present invention, the case that houses the drive unit has a box-shaped case body with one side open, a lid that is arranged to close the opening of the case body, and a plurality of parts that attach the case body and the lid. With a snap fit. The snap fit has a pawl provided on one of the case body and the lid, and a pawl receiving portion provided on the other to engage with the pawl. One of the case main body and the lid has a plurality of positioning holes extending in the mounting direction of the case main body and the lid. The other of the case body and the lid has a plurality of posts extending in the mounting direction and inserted into the plurality of positioning holes. The post is formed such that the tip of the post is inserted into the positioning hole before the claw portion and the claw receiving portion of the snap-fit are caught when the case main body and the lid are attached. With this arrangement, the post is inserted into the positioning hole when attaching the case body and the lid, and the movement of the case body and the lid is guided in the mounting direction by the positioning hole and the post. Movement in orthogonal directions is restricted. As a result, it is possible to evenly apply a bending force to the plurality of snap-fits, and to hook the claw portions and the claw-receiving portions at the same timing in the plurality of snap-fits. As a result, positional deviation between the case main body and the lid can be effectively suppressed, and the case main body and the lid can be attached appropriately.

Further, the lid is provided with a recess into which at least the sensor support is fitted, so that the sensor support is positioned with respect to the case body via the lid. Therefore, the rotation angle sensor supported by the sensor support can be appropriately arranged with respect to the valve shaft supported by the bearing of the case body.

1 is a perspective view of a channel switching valve according to one embodiment of the present invention; FIG. FIG. 2 is a left side view of the flow path switching valve of FIG. 1; 2 is a left side view showing a state in which a lid body is lifted from a gear case body of the flow path switching valve of FIG. 1; FIG. 2A and 2B are a plan view and a bottom view of a lid of the flow path switching valve of FIG. 1; FIG. FIG. 2 is a longitudinal sectional view of the flow path switching valve of FIG. 1; FIG. 2 is a plan view of a valve body included in the flow path switching valve of FIG. 1; 2 is a plan view showing a state in which the upper wall portion of the gear case is removed in the flow path switching valve of FIG. 1; FIG. 2 is a plan view showing a state in which an upper wall portion of a gear case and a rotational position detection portion are removed in the flow path switching valve of FIG. 1; FIG. 2 is a diagram for explaining a rotational position detector included in the flow path switching valve of FIG. 1; FIG.

A channel switching valve according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 9. FIG.

FIG. 1 is a perspective view of a channel switching valve according to one embodiment of the present invention. 2 is a left side view of the flow path switching valve of FIG. 1. FIG. 3 is a left side view showing a state in which a cover is lifted from a gear case body of the flow path switching valve of FIG. 1. FIG. 4(a) and 4(b) are a plan view and a bottom view of a lid of the flow path switching valve of FIG. 1. FIG. 5 is a cross-sectional view (longitudinal cross-sectional view) along the rotation axis of the ball valve body in the flow path switching valve of FIG. 1. FIG. 6 is a plan view of a valve body included in the flow path switching valve of FIG. 1. FIG. In FIG. 6, a ball valve element and a seat member are arranged in the valve chamber of the valve body. 7 is a plan view showing a state in which the upper wall portion of the gear case is removed in the flow path switching valve of FIG. 1, and FIG. 8 is a plan view showing a state in which the rotational position detection portion is further removed. FIG. 9 is a diagram for explaining a rotational position detector included in the flow path switching valve of FIG. 1. FIG. 9(a) and 9(b) are a left side view and a plan view of the rotational position detector. FIG. 9(c) is a plan view of a bus bar embedded in the potentiometer base of the rotational position detector. In the following description, "up, down, left, and right" are used to indicate relative positional relationships among members in each drawing, and do not indicate absolute positional relationships. In each figure, the X-axis direction is the horizontal direction, the Y-axis direction is the front-back direction (front-back direction), and the Z-axis direction is the vertical direction. The X-axis, Y-axis, and Z-axis are orthogonal to each other.

As shown in each figure, the flow path switching valve 1 of this embodiment has a valve body 10, a ball valve body 20 as a valve body, seat members 30, 30, and a valve shaft 40. . Further, the flow path switching valve 1 has a case 50 , a drive section 60 , a ventilation section 70 and a rotational position detection section 80 .

The valve body 10 is made of synthetic resin such as polyphenylene sulfide (PPS), and is formed in a substantially cubic box shape with an open top. The valve body 10 has a bottom wall portion 15 and a rectangular cylindrical peripheral wall portion 16 . The peripheral wall portion 16 has a left wall portion 10a, a front wall portion 10b, a right wall portion 10c and a rear wall portion 10d.

A substantially L-shaped first flow path 11 is provided in the left side wall portion 10 a of the valve body 10 . The front wall portion 10b of the valve body 10 is provided with a linear second flow path 12 extending toward the front side. The right side wall portion 10 c of the valve body 10 is provided with a substantially L-shaped third flow path 13 that is plane-symmetrical to the first flow path 11 . The first flow path 11 , the second flow path 12 and the third flow path 13 communicate with a valve chamber 14 provided inside the valve body 10 . In the valve chamber 14, annular seat members 30, 30 made of synthetic resin are arranged so as to face each other with a gap in the left-right direction.

The ball valve body 20 is formed in a hollow ball shape (spherical shape), for example, using metal, synthetic resin, or the like as a material. The ball valve element 20 is housed in the valve chamber 14 while being rotatably supported by the seat members 30 , 30 . Although the ball valve body 20 is used as the valve body in this embodiment, a columnar valve body may be used.

A valve stem insertion hole 24 into which a later-described valve stem 40 is inserted is provided in the upper portion of the ball valve element 20 . The valve shaft insertion hole 24 is formed so that when the valve shaft 40 is inserted, the ball valve element 20 rotates around the axis L, which is the rotation axis, as the valve shaft 40 rotates. The ball valve element 20 is rotated around the axis L to switch the connections among the first flow path 11 , the second flow path 12 and the third flow path 13 . In this embodiment, the valve stem insertion hole 24 is formed in a regular hexagonal shape.

The valve shaft 40 is made of synthetic resin and formed into a columnar shape extending linearly as a whole. The valve shaft 40 has a columnar portion 41 and a square columnar portion 42 coaxially connected to the lower end of the columnar portion 41 . The valve stem 40 is arranged along the axis L. As shown in FIG.

A groove is provided along the entire periphery of the lower end of the columnar portion 41, and an O-ring 44 made of an elastic material such as rubber is fitted in the groove. A large-diameter gear 67 of the driving portion 60 is coaxially attached to the upper end portion of the cylindrical portion 41 . A substantially cylindrical mounting hole 45 along the axis L is provided in the center of the upward facing end surface 41a of the cylindrical portion 41. As shown in FIG. A potentiometer shaft 81 of the rotational position detector 80 is attached to the attachment hole 45 by press fitting.

The prismatic portion 42 is formed in a columnar shape having a cross-sectional shape (cross-sectional shape) orthogonal to the axis L that is the same regular hexagonal shape as the valve stem insertion hole 24 . The prismatic portion 42 is attached to the ball valve body 20 along the axis L by being inserted into the valve stem insertion hole 24 of the ball valve body 20 . Since the cross-sectional shape of the prismatic portion 42 is formed in the same regular hexagonal shape as that of the valve shaft insertion hole 24, the valve shaft insertion hole 24 and the prismatic portion 42 are fitted to each other, and the ball moves as the valve shaft 40 rotates. The valve body 20 is rotated around the axis L.

The case 50 is made of, for example, synthetic resin such as polyphenylene sulfide (PPS). Case 50 is attached to valve body 10 . Case 50 accommodates drive unit 60 . The case 50 has a motor case 51 and a gear case 52 .

The motor case 51 is formed in a cylindrical shape with a bottom, and accommodates the motor 61 of the drive unit 60 .

The gear case 52 includes a flat bottom wall portion 53 integrally provided with the motor case 51, an upper wall portion 54 provided with a ventilation portion 70, and a peripheral wall portion connecting the bottom wall portion 53 and the upper wall portion 54. 55 and . The bottom wall portion 53 and the peripheral wall portion 55 are provided integrally to form a box-shaped gear case main body 52A with an open top. The upper wall portion 54 constitutes a lid body 52B arranged so as to close the opening of the gear case main body 52A. The gear case 52 accommodates the first worm 62 , the intermediate gear body 63 and the large-diameter gear 67 of the drive section 60 and the rotational position detection section 80 .

Gear case 52 has a plurality of snap fits 90 . A plurality of snap fits 90 attach the gear case body 52A and the lid body 52B to each other. Each snap fit 90 has a claw portion 91 provided on the peripheral wall portion 55 of the gear case main body 52A and a U-shaped claw receiving portion 92 provided on the lid body 52B. The claw portion 91 has an inclined surface 91a that gradually faces outward as it goes downward, and a planar lower surface 91b that faces downward. The claw receiving portion 92 has a U-shaped upper end portion 92a connected to the side surface of the lid body 52B and a U-shaped lower end portion 92b that is arranged so as to be hooked with the lower surface 91b of the claw portion 91 . The plurality of claw portions 91 of the plurality of snap fits 90 are formed in the same shape, and the positions in the vertical direction (Z-axis direction) are the same. The claw receiving portions 92 of the plurality of snap fits 90 are also formed in the same shape, and the positions in the vertical direction are the same. Note that the gear case main body 52A may have the claw receiving portion 92 and the lid body 52B may have the claw portion 91 . The claw portion 91 and the claw receiving portion 92 may have any shape as long as they do not contradict the object of the present invention.

The gear case main body 52A has a plurality of positioning holes 58. As shown in FIG. The lid 52B has a plurality of posts 59 corresponding to the plurality of positioning holes 58, respectively. The plurality of positioning holes 58 and the plurality of posts 59 have the same diameter, and are formed to extend in the mounting direction (Z-axis direction) between the gear case main body 52A and the lid 52B. Each post 59 is formed so that the tip of the post 59 is inserted into the positioning hole 58 before the claw portion 91 and the claw receiving portion 92 of each snap fit 90 are caught when the gear case main body 52A and the lid body 52B are attached. It is In other words, when the gear case main body 52A and the lid body 52B are arranged so as to face each other in the mounting direction, the distance from the lower surface 91b of the claw portion 91 to the lower end portion 92b of the claw receiving portion 92 (where it is caught by the lower surface 91b) is The distance from positioning hole 58 to post 59 is shorter. A configuration in which the gear case main body 52A has a plurality of posts 59 and the lid body 52B has a plurality of positioning holes 58 may be employed. That is, the positioning holes 58 and the posts 59 may be provided in either the gear case body 52A or the lid 52B. Also, the claw portion 91 and the claw receiving portion 92 of the snap fit 90 may be provided on either the gear case main body 52A or the lid body 52B regardless of the positioning hole 58 and the post 59. FIG.

The lower surface 54a of the lid 52B is provided with a recess 54b having the same external shape as the potentiometer base 82 of the rotational position detector 80, which will be described later. The concave portion 54b is provided so that the potentiometer base 82 is fitted therein when the gear case main body 52A and the lid member 52B are attached. As a result, the gear case body 52A and the potentio base 82 are positioned via the lid 52B. The recessed portion 54b may be provided so that at least the sensor support portion 84 of the potentiometer base 82 is fitted therein.

The gear case 52 has a cylindrical bearing portion 56 integrally provided with the bottom wall portion 53 . The cylindrical portion 41 of the valve shaft 40 is inserted into the bearing portion 56 to rotatably support the cylindrical portion 41 . The valve shaft 40 is rotatably supported by the bearing portion 56 so as to straddle the valve body 10 and the gear case 52 . Further, the gear case 52 has a square cylindrical inner peripheral wall portion 57 as an annular wall portion protruding downward from the bottom wall portion 53 . The inner peripheral wall portion 57 is inserted inside the valve body 10 and joined to the peripheral wall portion 16 of the valve body 10 by ultrasonic welding or infrared welding.

The driving portion 60 rotationally drives the ball valve element 20 via the valve shaft 40 . The drive unit 60 has a motor 61, a first worm 62 that constitutes a reduction gear, an intermediate gear body 63, and a large-diameter gear 67 as a drive gear.

The motor 61 is arranged in the motor case 51 so that the drive shaft 61 a protrudes into the gear case 52 through a through hole provided in the bottom wall portion 53 of the gear case 52 . A first worm 62 is attached to the tip of the drive shaft 61a.

The intermediate gear body 63 is arranged inside the gear case 52 . The intermediate gear body 63 is provided on the shaft portion 64 and one end portion 64a of the shaft portion 64, and is provided on the small diameter gear 65 (first worm wheel) that meshes with the first worm 62 and the other end portion 64b of the shaft portion 64. , and a second worm 66 that meshes with the large-diameter gear 67 (second worm wheel).

The large-diameter gear 67 is arranged inside the gear case 52 . The large-diameter gear 67 is formed in the shape of a disk, and the cylindrical portion 41 of the valve shaft 40 is press-fitted into a central through hole. The large-diameter gear 67 is attached to the end of the valve shaft 40 on the gear case 52 side.

The drive unit 60 rotates the valve shaft 40 around the axis L by transmitting the rotational force of the drive shaft 61a of the motor 61 to the valve shaft 40 through the first worm 62, the intermediate gear body 63 and the large diameter gear 67. Thereby, the ball valve body 20 is positioned at a desired rotational position.

The rotational position detector 80 has a potentiometer shaft 81 that is a rotational angle output shaft, a potentiometer base 82 that is a base body, and a potentiometer 85 that is a rotational angle sensor.

The potentiometer shaft 81 is made of metal such as stainless steel or brass or synthetic resin such as polyphenylene sulfide (PPS), and is provided separately from the valve shaft 40 . The potentiometer shaft 81 is coaxially fixed to the valve shaft 40 by being press-fitted into a mounting hole 45 provided in the end face 41a of the valve shaft 40 (the end face on the side of the gear case main body 52A). A D-shaped fitting shaft portion 81a provided at the upper end portion of the potentiometer shaft 81 protrudes from the end surface 41a. The fitting shaft portion 81 a is fitted with the rotor 86 of the potentiometer 85 . Note that the fitting shaft portion 81a may be provided integrally with the end surface 41a of the valve shaft 40 .

The potentio base 82 integrally has a base body portion 83 and a sensor support portion 84 . The base body portion 83 is formed in a substantially flat plate shape and is fixed by screws 95 to columnar bosses 53c, 53c projecting upward from the bottom wall portion 53 of the gear case 52. As shown in FIG. The sensor support portion 84 is formed in a substantially disc shape with a diameter smaller than that of the large-diameter gear 67, and a potentiometer 85 is attached in the center. The sensor support portion 84 is arranged so as to overlap the large-diameter gear 67 in the gear case 52 .

The potentio base 82 is composed of a synthetic resin and a metal bus bar 88 integrated by insert molding. In this embodiment, as shown in FIG. 9, the busbar 88 has a first busbar 88a, a second busbar 88b, and a third busbar 88c. Before insert molding, the first bus bar 88a and the second bus bar 88b are connected by the connecting portion 88d, and the second bus bar 88b and the third bus bar 88c are connected by the connecting portion 88e. As a result, the first bus bar 88a, the second bus bar 88b, and the third bus bar 88c can be handled as one component, and installation and positioning on the mold in insert molding can be easily performed. After insert molding, the connecting portions 88d and 88e are exposed, and the connecting portions 88d and 88e are cut by punching with a punch tool or the like to form a through hole 89. As shown in FIG. Thereby, the first busbar 88a, the second busbar 88b and the third busbar 88c are electrically disconnected. Terminals of the potentiometer 85 are connected to the first bus bar 88a, the second bus bar 88b and the third bus bar 88c.

The potentiometer 85 is a rotation angle sensor for detecting a rotation angle (rotation angle). The potentiometer 85 has a disk-shaped rotor 86 and a meter main body 87 that rotatably supports the rotor 86 and is a signal output section that outputs a signal (voltage) corresponding to the rotation angle of the rotor 86. are doing. A D-shaped fitting hole is provided in the center of the rotor 86. A fitting shaft portion 81a of the potentiometer shaft 81 passes through the fitting hole, and the rotor 86 rotates together with the fitting shaft portion 81a. are mated so as to be The rotor 86 is rotated with the rotation of the fitting shaft portion 81a. Thereby, the potentiometer 85 detects the rotation angle around the axis L of the potentiometer shaft 81 (that is, the valve shaft 40 and the ball valve body 20).

In the flow path switching valve 1, the rotational force of the drive shaft 61a of the motor 61 of the drive unit 60 is output to the valve shaft 40 through the large-diameter gear 67 and the like, and the valve shaft 40 is rotated around the axis L. As the valve shaft 40 rotates, the ball valve body 20 rotates about the axis L and is positioned at each rotational position. As a result, connection of the flow paths according to the rotational position is realized. Also, the potentiometer shaft 81 rotates around the axis L together with the valve shaft 40 , and the potentiometer 85 outputs a signal corresponding to the rotation angle of the potentiometer shaft 81 . Based on the signal output from the potentiometer 85, the rotational position of the ball valve element 20 can be monitored.

Next, a method of attaching the gear case main body 52A and the lid body 52B of the flow path switching valve 1 will be described.

The gear case main body 52A and the lid body 52B are arranged so as to face each other in the mounting direction (Z-axis direction). The cover 52B is gradually brought closer to the gear case main body 52A, and the tips of the posts 59 of the cover 52B are inserted into the positioning holes 58 of the gear case main body 52A corresponding to the posts 59, respectively. When the cover 52B is brought closer to the gear case main body 52A and the insertion of the posts 59 into the positioning holes 58 is advanced, the lower ends 92b of the claw receiving portions 92 of the plurality of snap fits 90 ride on the inclined surfaces 91a of the claw portions 91. As a result, the pawl receiving portion 92 bends outward. At this time, the positioning holes 58 and the posts 59 guide the movement of the cover 52B in the mounting direction and regulate the movement in the direction perpendicular to the mounting direction. Adds a twisting force. When the cover 52B is brought closer to the gear case main body 52A, the pawl receiving portions 92 climb over the inclined surfaces 91a and restore their original shapes, and the lower ends 92b of the pawl receiving portions 92 contact the lower surfaces 91b of the pawl portions 91. caught at the same time. Thus, the gear case main body 52A and the lid 52B are attached.

As described above, according to the flow path switching valve 1 of the present embodiment, the gear case 52 housing the driving portion 60 is arranged so as to close the box-shaped gear case main body 52A with one side open and the opening of the gear case main body 52A. It has a lid 52B and a plurality of snap fits 90 for attaching the gear case main body 52A and the lid 52B. The snap fit 90 has a pawl portion 91 provided on the gear case main body 52A and a pawl receiving portion 92 provided on the lid body 52B and hooked with the pawl portion 91 . The gear case main body 52A has a plurality of positioning holes 58 extending in the mounting direction between the gear case main body 52A and the lid 52B. The lid body 52B has a plurality of posts 59 extending in the mounting direction and inserted into a plurality of positioning holes 58. As shown in FIG. The post 59 is arranged so that the tip of the post 59 is inserted into the positioning hole 58 before the claw portion 91 and the claw receiving portion 92 of the snap fit 90 are caught when the gear case main body 52A and the lid body 52B are attached. formed. With this configuration, the post 59 is inserted into the positioning hole 58 when the gear case body 52A and the lid 52B are attached, and the gear case body 52A and the lid 52B are aligned in the mounting direction by the positioning hole 58 and the post 59. Movement is guided and movement in a direction orthogonal to the mounting direction is restricted. As a result, it is possible to uniformly apply a bending force to the plurality of snap fits 90, and to hook the claw portions 91 and the claw receiving portions 92 in the plurality of snap fits 90 at the same timing. As a result, positional deviation between the gear case main body 52A and the cover 52B can be effectively suppressed, and the gear case main body 52A and the cover 52B can be properly attached.

Further, the lid 52B is provided with a recess 54b in which the potentiometer base 82 is fitted. By doing so, the sensor support portion 84 of the potentio base 82 is positioned with the gear case main body 52A via the lid 52B. Therefore, the potentiometer 85 supported by the sensor support portion 84 can be appropriately arranged with respect to the valve shaft 40 supported by the bearing portion 56 of the gear case main body 52A.

Although embodiments of the present invention have been described above, the present invention is not limited to these examples. A person skilled in the art may add, delete, or change the design of the above-described embodiments as appropriate, or combine the features of the embodiments as appropriate, as long as they do not conflict with the spirit of the present invention. included in the range of

DESCRIPTION OF SYMBOLS 1... Flow-path switching valve 10... Valve main body 10a... Left side wall part 10b... Front wall part 10c... Right side wall part 10d... Back wall part 11... First flow path 12... Second flow path DESCRIPTION OF SYMBOLS 13... 3rd flow path, 14... Valve chamber, 15... Bottom wall part, 16... Surrounding wall part, 20... Ball valve body, 24... Valve shaft insertion hole, 30... Seat member, 40... Valve shaft, 41... Cylindrical part , 41a end surface 42 prismatic portion 44 O-ring 45 mounting hole 50 case 51 motor case 52 gear case 52A gear case main body 52B cover 53 bottom wall portion 53c Boss 54 Upper wall portion 54a Lower surface 54b Concave portion 55 Peripheral wall portion 56 Bearing portion 57 Inner peripheral wall portion 58 Positioning hole 59 Post 60 Driving portion 61 Motor , 61a drive shaft 62 first worm 63 intermediate gear body 64 shaft 64a one end 64b other end 65 small gear 66 second worm 67 large gear , 70... Ventilation part 80... Rotation position detection part 81... Potentiometer shaft 81a... Fitting shaft part 82... Potentiometer base 83... Base body part 84... Sensor support part 85... Potentiometer 86... Rotor, 87...Meter body, 88...Busbar, 88a...First busbar, 88b...Second busbar, 88c...Third busbar, 88d, 88e...Connecting part, 90...Snap fit, 91...Claw part, 91a...Slanted surface, 91b...Lower surface 92...Claw receiving part 92a...Upper end part 92b...Lower end part 95...Screw

Claims (3)

A valve body, a valve body rotatably accommodated in the valve body, a valve shaft attached to the valve body, a drive section for driving the valve body to rotate via the valve shaft, and a drive portion attached to the valve body. and a case that houses the drive unit, the flow path switching valve comprising:
The case has a box-shaped case body with one side open, a lid arranged to block the opening, and a plurality of snap-fits for attaching the case body and the lid,
The snap fit has a claw portion provided on one of the case body and the lid, and a claw receiving portion that is provided on the other and engages with the claw portion,
one of the case main body and the lid has a plurality of positioning holes extending in a direction in which the case main body and the lid are attached;
the other of the case body and the lid has a plurality of posts extending in the mounting direction and inserted into the plurality of positioning holes;
The tip of the post is inserted into the positioning hole before the claw portion and the claw receiving portion of the snap-fit are caught when the case body and the lid are attached to each other . , wherein the passage switching valve is formed in a columnar shape so as to guide the movement of the valve in the mounting direction and restrict the movement in the direction perpendicular to the mounting direction . the case body has a positioning hole, the lid has the post,
2. The flow path switching valve according to claim 1, wherein said positioning hole is arranged inside said peripheral wall portion of said case body. A bottom wall portion of the case body is provided with a bearing portion that rotatably supports the valve shaft,
A fitting shaft that rotates together with the valve shaft protrudes from the end face of the valve shaft on the case body side,
The case accommodates a rotation position detection unit having a rotation angle sensor having a rotor fitted with the fitting shaft, and a plate-shaped base body having a sensor support for supporting the rotation angle sensor. is,
3. The flow path switching valve according to claim 1, wherein said cover is provided with a recessed portion into which at least said sensor support portion is fitted.

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