JP7411389B2 - Opening/closing member drive device and toilet lid opening/closing unit - Google Patents

Description

The present invention relates to an opening/closing member driving device that drives an opening/closing member, and a toilet lid opening/closing unit that opens and closes a toilet lid of a toilet unit as an opening/closing member.

An opening/closing member driving device for opening/closing an opening/closing member such as a toilet lid is described in Patent Document 1. The opening/closing member drive mechanism of Patent Document 1 includes a motor, an output shaft to which the opening/closing member is connected, a transmission mechanism that transmits the driving force of the motor to the output shaft, and a case that houses the motor and the transmission mechanism. The output shaft projects outside from an opening provided in the case. The case is made of resin.

JP2016-77396A

The output shaft is connected to an end of the opening/closing member and opens/closes the opening/closing member in a cantilevered state. Therefore, a load is applied to the output shaft when opening and closing the opening/closing member. Here, when a support portion that rotatably supports the output shaft is provided in the case, the case may be bent due to the load applied to the output shaft, and the output shaft may be tilted. When the output shaft is tilted, the efficiency of transmitting torque to the opening/closing member deteriorates.

In view of this, an object of the present invention is to provide an opening/closing member drive device and a toilet lid opening/closing unit in which the output shaft does not tilt due to load when opening/closing the opening/closing member.

In order to solve the above problems, the opening/closing member driving device of the present invention includes a motor, an output shaft to which the opening/closing member is connected, a transmission mechanism that transmits the driving force of the motor to the output shaft, the motor and the output shaft. It has a case that accommodates a transmission mechanism, and a reinforcing member fixed inside the case, and when the axial direction of the output shaft is a first direction, the output shaft is arranged in one direction in the first direction. The transmission mechanism includes a base located in the case on one side, and a protrusion protruding from the case on the other side in the first direction, and the transmission mechanism includes an output gear, a pre-stage gear meshing with the output gear, a support shaft extending in the first direction and rotatably supporting the front gear, the output gear being coaxially fixed to the base of the output shaft and forming an output member together with the output shaft; The reinforcing member has higher rigidity than the case, and includes an output member receiving portion that rotatably supports the output member from an outer peripheral side, and a shaft holder that supports the other end of the support shaft in the first direction. It is characterized by comprising: and.

According to the present invention, the case includes a reinforcing member that is more rigid than the case. Further, the reinforcing member rotatably supports an output member consisting of an output shaft and an output gear. Therefore, even when a load is applied to the output shaft, the reinforcing member can prevent or suppress the output shaft from inclining. Further, a highly rigid reinforcing member supports the output member and the support shaft of the front gear. Therefore, it is possible to prevent the front gear and the output gear from being displaced away from each other due to an external load. Thereby, the meshing between the front gear and the output gear can be maintained in a normal state, so that deterioration of the torque transmission efficiency to the opening/closing member can be prevented or suppressed.

In the present invention, the output gear includes an annular portion having no teeth on the outer circumferential surface at the other end portion in the first direction, and the output member receiving portion is capable of rotating the annular portion from the outer circumferential side. may be supported. In this way, by supporting the output gear with the reinforcing member, it is possible to prevent or suppress the output shaft from inclining. Furthermore, since the highly rigid reinforcing member supports the output gear and the support shaft of the front gear, it is possible to prevent the front gear and the output gear from being displaced away from each other due to an external load.

In the present invention, the output shaft includes a bearing portion having a circular outer circumferential surface on the other side of the output gear in the first direction at the base, and the output member receiving portion includes the bearing portion on the outer circumferential side. It can be supported rotatably from In this way, it is possible to prevent or suppress the output shaft from being tilted by the reinforcing member. In addition, since the highly rigid reinforcing member supports the output shaft to which the output gear is coaxially fixed and the support shaft of the front gear, external loads can cause the front gear and the output gear to move away from each other. can be prevented from happening.

In the present invention, the output shaft includes a circular recess that is recessed toward the other side on one end surface in the first direction, and the case is inserted into the circular recess so that the output shaft and the output gear can be rotated. the other end of the support part in the first direction is located closer to the other end of the reinforcing member in the first direction than the end face of the reinforcing member in the first direction. It is desirable to be located in In this way, it is easy to prevent the output shaft from tilting.
It is characterized by

In the present invention, the output shaft includes a supported portion having a circular outer peripheral surface on the other side of the output gear in the first direction at the base, and the case supports the reinforcing member on the other side of the output gear in the first direction. The device may include a case portion that covers from the side, and the case portion may have an output bearing portion that rotatably supports the supported portion from the outer circumferential side. Thereby, the output shaft is also supported by the case. Therefore, it is easy to prevent the output shaft from tilting.

In the present invention, the case may be made of resin, and the reinforcing member may be made of metal. This increases the rigidity of the reinforcing member relative to the case.

In the present invention, the output gear may be made of metal. In this way, even if a load is applied to the output gear via the output shaft, the output gear can be prevented from deforming.

In the present invention, when two directions orthogonal to the first direction are defined as a second direction and a third direction, the output gear and the front gear are arranged along the second direction, and the reinforcement The member may be fixed to the case between the output member receiving portion and the shaft holding portion in the second direction. In this way, the reinforcing member is fixed to the case at a position close to the output gear. Therefore, when a load is applied to the output gear via the output shaft, the reinforcing member can be prevented from being bent.

In the present invention, the case includes a first side wall and a second side wall arranged in the third direction and extending in parallel to the second direction, and the reinforcing member includes a first side wall and a second side wall. A portion that is not in contact with each other is provided between the reinforcing member and the first side wall, and a portion that is not in contact with each other is provided between the reinforcing member and the second side wall. It may be assumed that there are parts that are not provided. In this way, the load applied from the output gear to the reinforcing member via the output shaft can be suppressed from being transmitted to the case.

In the present invention, the potentiometer includes a potentiometer that meshes with one of the gears constituting the transmission mechanism on one side of the reinforcing member in the first direction; The detection unit may be fixed to the other side of the reinforcing member in the first direction and detect the rotational angular position of the potentiometer gear. If a potentiometer is provided, it becomes easy to grasp the angular position around the axis of the opening/closing member connected to the output shaft. Further, in this case, the potentiometer can be arranged using the reinforcing member.

Next, the toilet lid opening/closing unit of the present invention is characterized in that it has the above-mentioned opening/closing member driving device, and the opening/closing member is a toilet lid.

According to the present invention, the output shaft of the opening/closing member drive device to which the toilet lid is connected does not tilt. Therefore, the opening and closing of the toilet lid is maintained normally.

According to the present invention, the case includes a reinforcing member having higher rigidity than the case. Further, the reinforcing member rotatably supports an output member consisting of an output shaft and an output gear. Therefore, even when a load is applied to the output shaft, the reinforcing member can prevent or suppress the output shaft from inclining. Further, a highly rigid reinforcing member supports the output member and the support shaft of the front gear. Therefore, it is possible to prevent the front gear and the output gear from being displaced away from each other due to an external load. Thereby, the meshing between the front gear and the output gear can be maintained in a normal state, so that deterioration of the torque transmission efficiency to the opening/closing member can be prevented or suppressed.

It is an external perspective view of an opening-and-closing member drive device. It is an explanatory view of a toilet lid opening and closing unit. It is a sectional view of an opening-and-closing member drive device. It is an exploded perspective view of an opening-and-closing member drive device. It is a perspective view when a motor, a transmission mechanism, and an output shaft are seen from the other side of a 1st direction. It is a perspective view when a motor, a transmission mechanism, and an output shaft are seen from one side of a 1st direction. It is an exploded perspective view when an output shaft, an output gear, a 1st coil spring, and a 2nd coil spring are seen from the other side of the 1st direction. It is an exploded perspective view when an output shaft, an output gear, a 1st coil spring, and a 2nd coil spring are seen from one side of a 1st direction. FIG. 3 is a perspective view of the intermediate case viewed from one side in the first direction. It is a sectional view of the opening-and-closing member drive device of a modification. It is an exploded perspective view of a reinforcement member, an output member, a 1st coil spring, and a 2nd coil spring.

Hereinafter, embodiments of the toilet lid opening/closing unit of the present invention will be described with reference to the drawings.

(overall structure)
FIG. 1 is an external perspective view of the opening/closing member driving device. FIG. 2 is an explanatory diagram of the toilet lid opening/closing unit. FIG. 3 is a sectional view of the opening/closing member driving device. FIG. 4 is an exploded perspective view of the opening/closing member driving device. FIG. 5 is a perspective view of the motor, transmission mechanism, and output shaft viewed from the other side in the axial direction. FIG. 6 is a perspective view of the motor, transmission mechanism, and output shaft viewed from one side in the axial direction. FIG. 7 is an exploded perspective view of the output shaft, the output gear, the first coil spring, and the second coil spring when viewed from the other side in the axial direction. FIG. 8 is an exploded perspective view of the output shaft, the output gear, the first coil spring, and the second coil spring as viewed from one side in the axial direction. FIG. 9 is a perspective view of the intermediate case viewed from one side in the axial direction.

The opening/closing member driving device 1 shown in FIG. 1 rotates opening/closing members such as lids and doors to open and close them. The toilet lid opening/closing unit 3 is constructed by connecting the toilet lid 201 of the toilet unit 200 as an opening/closing member to the opening/closing member driving device 1. More specifically, as shown in FIG. 2, the toilet unit 200 includes a toilet main body 202, a toilet seat 203, a toilet lid 201, and a tank 204. The end portion of the toilet lid 201 on the side of the tank 204 is connected to the output shaft 7 of the opening/closing member driving device 1 . Due to the rotation of the output shaft 7, the toilet lid 201 moves between a closed position where it lies flat and covers the toilet bowl main body 202 and an open position where it stands up from the toilet bowl main body 202. It is also possible to provide the second opening/closing member driving device 1 in the toilet unit 200, and to connect the toilet seat 203 as the opening/closing member to the output shaft 7 of the second opening/closing member driving device 1.

As shown in FIG. 3, the opening/closing member driving device 1 includes a motor 6, an output shaft 7 to which the toilet lid 201 is connected, a transmission mechanism 8 that transmits the driving force of the motor 6 to the output shaft 7, and the motor 6 and the output shaft 7. It has a case 9 that houses the transmission mechanism 8.

The output shaft 7 includes a protrusion 11 protruding from a case opening 10 of the case 9 and a base 12 housed in the case 9. The end of the toilet lid 201 is connected to the protrusion 11 of the output shaft 7 . Therefore, the opening/closing member driving device 1 opens and closes the toilet lid 201 in a cantilevered state. As shown in FIG. 1, the case 9 has a shape elongated in one direction when viewed from the direction along the axis L of the output shaft 7. The output shaft 7 projects from a longitudinal end portion of the case 9 to the outside of the case 9 .

Here, in the following description, the three mutually orthogonal directions are referred to as a first direction Z, a second direction Y, and a third direction X. The first direction Z is the axial direction along the axis L of the output shaft 7 , the second direction Y is the longitudinal direction of the case 9 , and the third direction X is the lateral direction of the case 9 . Further, in the first direction Z, the side where the case 9 is located is defined as one side Z1 in the first direction Z, and the side where the output shaft 7 projects is defined as the other side Z2 in the first direction Z.

Case 9 is made of resin. As shown in FIG. 1, the case 9 includes a first side wall 13 and a second side wall 14 that extend in parallel to the second direction Y. The case 9 also includes a third side wall 15 that extends in the third direction X and connects one end of the first side wall 13 and one end of the second side wall 14 . Furthermore, the case 9 includes a fourth side wall 16 that connects the other end of the first side wall 13 in the second direction Y and the other end of the second side wall 14 in the second direction Y. The fourth side wall 16 has a shape in which the space between the first side wall 13 and the second side wall 14 protrudes toward the other side in the second direction Y.

Further, the case 9 includes a first case 21, an intermediate case 22, and a second case 23 arranged along the first direction Z, as shown in FIGS. 1 and 3. The first case 21 is located on one side Z1 of the intermediate case 22 in the first direction Z, and the second case 23 is located on the other side Z2 of the intermediate case 22 in the first direction Z.

As shown in FIG. 4, the first case 21 includes a bottom wall portion 25 and a frame portion 26 extending from the outer peripheral edge of the bottom wall portion 25 to the other side Z2 in the first direction Z. The frame portion 26 constitutes end portions of the first side wall 13, the second side wall 14, the third side wall 15, and the fourth side wall 16 of the case 9 in the first direction Z. A motor 6 is fixed to the first case 21 . The motor 6 includes a motor body 28 , a rotating shaft 27 that protrudes from the motor body 28 , and a pair of motor terminals 29 that protrudes from the motor body 28 on the opposite side of the rotating shaft 27 . The output shaft 7 is located on the other side Z2 of the motor body 28 in the first direction Z. The rotating shaft 27 faces in a direction intersecting the axis L of the output shaft 7. In this example, the rotating shaft 27 faces in a direction perpendicular to the axis L of the output shaft 7. Furthermore, when viewed from the first direction Z, the rotating shaft 27 is inclined with respect to the second direction Y (the longitudinal direction of the case 9). The tip of the rotating shaft 27 is rotatably supported by a bearing member 30.

The intermediate case 22 has an intermediate bottom portion 31 and an outer peripheral edge of the intermediate bottom portion 31 on the other side Z in the first direction Z.
2. The intermediate frame portion 32 constitutes an intermediate portion in the first direction Z of the first side wall 13 , the second side wall 14 , the third side wall 15 , and the fourth side wall 16 of the case 9 . The intermediate case 22 accommodates some of the gears that constitute the transmission mechanism 8 .

A plate-shaped reinforcing member 35 is fixed to an end portion of the intermediate case 22 on the second case 23 side. The reinforcing member 35 has higher rigidity than the case 9. In this example, the reinforcing member 35 is made of metal. The reinforcing member 35 is provided with a reinforcing member side opening 36 . The output shaft 7 projects from the reinforcing member side opening 36 to the other side Z2 in the first direction Z. Further, a potentiometer 37 is attached to the reinforcing member 35. The potentiometer 37 is located at an end portion opposite to the output shaft 7 in the second direction Y.

The second case 23 is plate-shaped and is fixed to the intermediate case 22 by being placed over the reinforcing member 35 from the other side Z2 in the first direction Z. The second case 23 covers the reinforcing member 35 from the other side Z2 in the first direction Z. The second case 23 includes a plate portion 17 that serves as an end surface on the other side Z2 of the case 9 in the first direction Z. As shown in FIGS. 3 and 4, the plate portion 17 includes a plate through hole 17a through which the output shaft 7 passes. Further, the second case 23 includes an output bearing portion 69 that protrudes from the opening edge of the plate portion through hole 17a in the plate portion 17 to the other side Z2 in the first direction Z. The plate portion through hole 17a and the output bearing portion 69 are coaxially provided. The output shaft 7 passes through the plate through hole 17a and the output bearing part 69 inside the case 9, and extends from the case opening 10, which is the end of the other side Z2 in the first direction Z, of the output bearing part 69. protrude outward.

Here, as shown in FIGS. 5 and 6, the transmission mechanism 8 includes a worm 38, a first gear 39, a second gear 39, and a second It includes a gear 40, a third gear 41, a fourth gear 42 (pre-stage gear), and an output gear 43. The worm 38 is fixed to the outer peripheral side of the rotating shaft 27. The worm 38 and the first gear 39 are located inside the first case 21 . The second gear 40 , the third gear 41 , the fourth gear 42 , and the output gear 43 are located inside the intermediate case 22 .

The first gear 39 is located on the other side X2 of the rotation shaft 27 of the motor 6 in the third direction X. The first gear 39 includes a first large-diameter gear 39a that meshes with the worm 38, and a first small-diameter gear 39b that is coaxial with the first large-diameter gear 39a and has a smaller outer diameter than the first large-diameter gear 39a. . The first large diameter gear 39a is located on one side Z1 in the first direction Z of the first small diameter gear 39b. The first gear 39 is rotatably supported by a first support shaft 45 extending in the first direction Z. The first support shaft 45 has one end portion held by the bottom wall portion 25 of the first case 21 and the other end portion held by the intermediate bottom portion 31 of the intermediate case 22 . As shown in FIG. 3, the first gear 39 includes a torque limiter 46 that connects and disconnects transmission of driving force between the first large diameter gear 39a and the first small diameter gear 39b.

As shown in FIGS. 5 and 6, the second gear 40 includes a second large diameter gear 40a that meshes with the first small diameter gear 39b, and a second large diameter gear 40a that is coaxial with the second large diameter gear 40a and is outer than the second large diameter gear 40a. A second small diameter gear 40b having a small diameter is provided. The second large diameter gear 40a is located on one side Z1 in the first direction Z of the second small diameter gear 40b. The second large-diameter gear 40a meshes with the first small-diameter gear 39b via an intermediate case opening 33 provided in the intermediate bottom 31 of the intermediate case 22 (see FIG. 3). The second gear 40 is rotatably supported by a second support shaft 48 extending in the first direction Z. The second support shaft 48 has one end portion held by the intermediate bottom portion 31 of the intermediate case 22 and the other end portion held by the reinforcing member 35.

The third gear 41 includes a third large diameter gear 41a that meshes with the second small diameter gear 40b, and a third small diameter gear 41b that is coaxial with the third large diameter gear 41a and has a smaller outer diameter than the third large diameter gear 41a. Be prepared. The third large diameter gear 41a is located on one side Z1 in the first direction Z of the third small diameter gear 41b. The third gear 41 is rotatably supported by a third support shaft 49 extending in the first direction Z. Third support shaft 49
One end portion is held by the intermediate bottom portion 31 of the intermediate case 22, and the other end portion is held by the second case 23. The third support shaft 49 passes through the reinforcing member 35.

The fourth gear 42 is a spur gear that meshes with the third small diameter gear 41b and the output gear 43. The fourth gear 42 and the output gear 43 are arranged in the second direction Y. The fourth gear 42 is arranged coaxially with the second gear 40 and rotatably supported by the second support shaft 48 . As shown in FIG. 3, the second support shaft 48 has one end portion held by the intermediate case 22 and the other end portion held by the reinforcing member 35. That is, the intermediate bottom portion 31 of the intermediate case 22 includes a shaft holding portion 34 that holds the second support shaft 48 that supports the second gear 40 and the fourth gear 42 . The reinforcing member 35 includes a shaft holding portion 47 that holds a second support shaft 48 that supports the second gear 40 and the fourth gear 42 (see FIG. 9).

The output gear 43 is made of metal. The output gear 43 is coaxially fixed to the output shaft 7. That is, as shown in FIGS. 7 and 8, the output gear 43 has an annular shape, and the base 12 of the output shaft 7 is inserted into the center hole. The inner peripheral surface of the output gear 43 is provided with a plurality of recesses 51 in the circumferential direction, and the outer peripheral surface of the base 12 of the output shaft 7 is provided with a plurality of protrusions that fit into the recesses 51 on the inner peripheral surface of the output gear 43. 52 are provided. Thereby, the output gear 43 and the output shaft 7 are connected in a state where they cannot rotate relative to each other around the axis L. The output gear 43 constitutes the output member 5 together with the output shaft 7.

Here, the transmission mechanism 8 includes a first coil spring 53 and a second coil spring 54. The first coil spring 53 is located on one side Z1 of the output gear 43 in the first direction Z. The first coil spring 53 is placed on the intermediate bottom portion 31 of the intermediate case 22. The end portion 53a of the first coil spring 53 on one side Z1 in the first direction Z extends on the one side Z1 in the first direction Z. An end portion 53a of the first coil spring 53 on one side Z1 in the first direction Z protrudes from a through hole 55 provided in the intermediate bottom 31 of the intermediate case 22 to the one side Z1 in the first direction Z, and is attached to the first case 21. The first coil spring is locked to a first locking portion 56 (see FIG. 4). The end portion 53b of the first coil spring 53 on the other side Z2 in the first direction Z extends to the other side Z2 in the first direction Z, and is connected to the first coil spring second locking portion provided on the outer peripheral surface of the output gear 43. 57 so that it can be locked. The first coil spring second locking portion 57 is a notch provided in the tooth portion of the output gear 43. The end portion 53b of the first coil spring 53 on the other side Z2 in the first direction Z can be viewed from the circumferential direction with respect to the output gear 43. The cross section of the first coil spring 53 is rectangular.

The second coil spring 54 is located on the inner peripheral side of the first coil spring 53. The second coil spring 54 is placed on the intermediate bottom portion 31 of the intermediate case 22. The second coil spring 54 is located on one side Z1 of the output shaft 7 in the first direction Z. The end portion 54a of the second coil spring 54 on one side Z1 in the first direction Z extends toward the inner peripheral side of the second coil spring 54, and the end portion 54a of the second coil spring 54 extends toward the inner peripheral side of the second coil spring 54, and 1 locking portion 58 (see FIG. 9). The end portion 54b of the second coil spring 54 on the other side Z2 in the first direction Z extends to the other side Z2 in the first direction Z, and the end portion 54b of the second coil spring 54 extends in the other side Z2 in the first direction Z. It is locked by a coil spring second locking part 59 (see FIG. 8).

(Support structure of output member)
As shown in FIGS. 3 and 9, the output member 5 is rotatably supported by a support portion 61 that protrudes from the intermediate bottom portion 31 of the intermediate case 22 to the other side Z2 in the first direction Z. As shown in FIG. 3, the support portion 61 is located on the inner peripheral side of the first coil spring 53 and the second coil spring 54, and protrudes further toward the other side Z2 in the first direction Z than the first coil spring 53 and the second coil spring 54. do. Here, the output shaft 7 of the output member 5 is provided with a circular recess 62 that is recessed toward the other side Z2 in the first direction Z on the end surface of one side Z1 in the first direction Z, and the support part 61 is provided with a distal end portion thereof. is inserted into the circular recess 62. The tip of the support portion 61 is connected to the bottom surface of the circular recess 62 (first direction Z of the circular recess 62).
(the circular inner wall surface on the other side Z2).

Further, the output gear 43 of the output member 5 is rotatably supported by the reinforcing member 35. That is, the output gear 43 includes an annular portion 43a having no teeth on the outer circumferential surface at an end portion on the other side Z2 in the first direction Z. On the other hand, as shown in FIGS. 3 and 4, the reinforcing member 35 has an output gear receiving portion 65, which rotatably supports the annular portion 43a of the output gear 43 from the outer circumferential side, at the outer peripheral edge portion of the reinforcing member side opening 36. (output member receiving part). The output gear receiving portion 65 is a cylindrical portion that bends and extends from the reinforcing member side opening 36 of the reinforcing member 35 to the other side Z2 in the first direction Z. The output gear receiving portion 65 is provided by, for example, burring. Here, as shown in FIG. 3, the end of the support part 61 on the other side Z2 in the first direction Z is further away from the end surface 35a on the one side Z1 in the first direction Z of the reinforcing member 35 on the other side in the first direction Z. Located in Z2.

Further, the output shaft 7 is rotatably supported by the second case 23. That is, the output shaft 7 includes a supported portion 68 having a circular outer circumferential surface on the other side Z2 in the first direction Z than the output gear 43 in the base portion 12 located inside the case 9 . The second case 23 (case portion) includes a cylindrical output bearing portion 69 extending in the first direction Z at the outer peripheral edge portion of the case opening 10. Rotatably supported from the side. The output gear receiving portion 65 is a cylindrical portion that is bent and extends toward the other side Z2 of the case opening 10 in the second case 23 in the first direction Z. Further, the output shaft 7 includes an annular groove 70 in the middle of the supported portion 68 in the first direction Z. An O-ring 71 is attached to the annular groove 70. The O-ring 71 seals between the output bearing portion 69 of the second case 23 and the output shaft 7 in a radially compressed state.

(Fixing structure of reinforcing member)
Here, the reinforcing member 35 is fixed to the intermediate case 22 between the output gear receiving part 65 and the shaft holding part 47 in the second direction Y. That is, as shown in FIG. 9, the intermediate case 22 has a first frame portion 32a and a second frame portion 32b extending in parallel to the second direction Y in the intermediate frame portion 32, and a first frame portion 32a and a second frame portion 32b that respectively protrude inwardly. It includes a protrusion 73 and a second protrusion 74. Each of the first protrusion 73 and the second protrusion 74 is provided with a screw hole. Further, the first frame portion 32a includes a rectangular first notch 32c at a position where the first protrusion 73 is provided. The second frame portion 32b includes a rectangular second notch 32d at the position where the second protrusion 74 is provided. The second frame portion 32b is a portion that constitutes a part of the second side wall 14 of the case. The first protrusion 73 and the second protrusion 74 face each other in the third direction X.

On the other hand, as shown in FIG. 4, the reinforcing member 35 has a pair of protrusions 35b and 35c protruding on both sides in the third direction X between the output gear receiving part 65 and the shaft holding part 47 in the second direction Y. Equipped with A through groove is provided in each of the protrusions 35b and 35c. In the reinforcing member 35, the protrusion 35b on one side X1 in the third direction X is inserted into the first notch 32c of the first frame portion 32a from the other side Z2 in the first direction Z, and comes into contact with. Further, in the reinforcing member 35, the protrusion 35c on the other side X2 in the third direction 74. The reinforcing member 35 is fixed to the intermediate case 22 by a screw 75 that passes through the second case 23, passes through the through groove of the protrusion 35b, and is screwed into the screw hole of the first protrusion 73. Ru. Further, the reinforcing member 35 is fixed to the intermediate case 22 by a screw 75 that passes through the second case 23, passes through a through groove of the protrusion 35c, and is screwed into a screw hole 75 of the second protrusion 74. be done. With the reinforcing member 35 fixed to the intermediate case 22, a gap 76 is partially provided between the reinforcing member 35 and the first frame portion 32a, and a gap 76 is provided between the reinforcing member 35 and the second frame portion 32b. A gap 77 is partially provided in the. That is, in a state where the reinforcing member 35 is fixed to the case 9, a portion (gap 76) is provided between the reinforcing member 35 and the first side wall 13 that are not in contact with each other. Further, a portion (gap 77) that does not contact each other is provided between the reinforcing member 35 and the second side wall 14.

(potentiometer)
Next, the potentiometer 37 includes a potentiometer gear 81 that meshes with one of the plurality of gears constituting the transmission mechanism 8, as shown in FIG. Further, the potentiometer 37 includes a detection section 82 that detects the rotational angular position of the potentiometer gear 81, as shown in FIG. The potentiometer gear 81 is located on one side Z1 of the reinforcing member 35 in the first direction Z, and meshes with the third small diameter gear 41b of the third gear 41. The detection unit 82 is fixed to the reinforcing member 35 via a substrate 83. Here, wiring (not shown) for supplying power to the motor 6 is connected between the substrate 83 and the pair of motor terminals 29. A plurality of terminal pins 86 connected to wiring and the potentiometer 37 are fixed to the substrate 83. The intermediate case 22 includes a terminal pin holding portion 87 at the end of the intermediate frame portion 32 on one side Y1 in the second direction Y.

(motion)
When the motor 6 is driven in the forward or reverse direction by supplying power through the terminal pin 86, the driving force of the motor 6 is transmitted to the output shaft 7 through the transmission mechanism 8. Therefore, the toilet lid 201 fixed to the output shaft 7 rotates in the closing direction A toward the closed position or in the opening direction B toward the open position, as shown in FIG. When the toilet lid 201 rotates, the potentiometer 37 outputs a signal corresponding to the rotational angular position of the toilet lid 201.

Further, when the toilet lid 201 connected to the output shaft 7 rotates in the closing direction A, the first coil spring 53 and the second coil spring 54 accumulate a biasing force that causes the output shaft 7 to rotate in the opening direction B around the axis L. Therefore, the first coil spring 53 and the second coil spring 54 function as assist springs that bias the output shaft 7 driven in the opening direction B when the toilet lid 201 rotates in the opening direction B. . Further, the transmission mechanism 8 includes a torque limiter 46 on the first gear 39. Therefore, when an excessive load is applied to the transmission mechanism 8 from the toilet lid 201 via the output shaft 7, the torque limiter 46 functions to cut off the transmission of the driving force by the transmission mechanism 8. This prevents the transmission mechanism 8 from being damaged due to excessive external load.

(effect)
According to this example, the case 9 includes a reinforcing member 35 that is more rigid than the case 9. Further, the reinforcing member 35 includes an output gear bearing portion 65 that rotatably supports the output gear 43 coaxially fixed to the output shaft 7 . Therefore, even if a load is applied to the output shaft 7, the output shaft 7 will not be tilted due to the support of the output gear 43 by the reinforcing member 35. Further, since the highly rigid reinforcing member 35 supports the second support shaft 48 of the fourth gear 42 that meshes with the output gear 43, the fourth gear 42 does not tilt. Thereby, it is possible to prevent the fourth gear 42 and the output gear 43 from being displaced in a direction away from each other due to an external load, so that the meshing between the fourth gear 42 and the output gear 43 can be maintained in a normal state. Therefore, the efficiency of torque transmission to the toilet lid 201 does not deteriorate.

Further, the output shaft 7 is provided with a circular recess 62 recessed toward the other side on the end face of one side Z1 in the first direction Z, and the case 9 is inserted into the circular recess 50 so that the output shaft 7 and the output gear 43 can be rotated. It is provided with a support part 61 that supports. The end of the support part 61 on the other side Z2 in the first direction Z is located on the other side Z2 in the first direction Z than the end surface of the reinforcing member 35 on the one side Z1 in the first direction Z in the circular recess 50. . Therefore, it is easy to prevent the output shaft 7 from tilting.
characterized by

Further, the output shaft 7 includes a supported portion 68 having a circular outer peripheral surface on the other side Z2 of the output gear 43 in the first direction Z at the base portion 12. The case 9 includes a second case 23 that covers the reinforcing member 35 from the other side Z2 in the first direction Z, and the second case 23 includes an output shaft 7 support portion that rotatably supports the supported portion 68 from the outer circumferential side. 61. Thereby, the output shaft 7 is also supported by the case 9. Therefore, it is easy to prevent the output shaft 7 from tilting.

Further, in this example, the case 9 is made of resin, and the reinforcing member 35 is made of metal. Therefore, the rigidity of the reinforcing member 35 relative to the case 9 is increased.

Furthermore, the output gear 43 is made of metal. Therefore, even if a load is applied to the output gear 43 via the output shaft 7, the output gear 43 can be prevented from deforming.

Further, in this example, the output gear 43 and the fourth gear 42 are arranged along the second direction Y, and the reinforcing member 35 is arranged between the output gear receiving part 65 and the shaft holding part 47 in the second direction Y. It is fixed to the case 9 between. That is, in the reinforcing member 35, a pair of protrusions 35b and 35c located between the output gear receiving part 65 and the shaft holding part 47 in the second direction Y are fixed to the case 9. Thereby, the reinforcing member 35 is fixed to the case 9 at a position close to the output gear 43. Therefore, when a load is applied to the output gear 43 via the output shaft 7, the reinforcing member 35 can be prevented from being bent.

Further, the case 9 includes a first wall portion and a second side wall 14 arranged in the third direction X and extending in parallel to the second direction Y. The reinforcing member 35 is arranged between the first side wall 13 and the second side wall 14, and a gap 76 is partially provided between the reinforcing member 35 and the first side wall 13, so that the reinforcing member 35 and A gap 77 is partially provided between the second side wall 14 and the second side wall 14 . In this way, the reinforcing member 35 and the case 9 have portions that are not in contact with each other, so that the load applied from the output gear 43 to the reinforcing member 35 via the output shaft 7 is not transmitted to the case 9. can be suppressed.

Moreover, this example has a potentiometer 37, and the potentiometer 37 is a potentiometer that meshes with one of the gears of the plurality of gears constituting the transmission mechanism 8 on one side Z1 of the reinforcing member 35 in the first direction Z. It includes a gear 81 and a detection unit 82 fixed to the other side Z2 of the reinforcing member 35 in the first direction Z and detecting the rotational angular position of the potentiometer gear 81. This makes it easy to grasp the angular position of the toilet lid 201 connected to the output shaft 7 around the axis L. Further, the potentiometer 37 can be arranged using the reinforcing member 35.

Here, according to the toilet lid 201 opening/closing unit of this example, the output shaft 7 of the opening/closing member driving device 1 to which the toilet lid 201 is connected does not tilt. Therefore, the opening and closing of the toilet lid 201 can be maintained in a normal state.

(Modified example)
FIG. 10 is a cross-sectional view of a modified opening/closing member driving device. FIG. 11 is an exploded perspective view of the reinforcing member 35, the output member 5, the first coil spring 53, and the second coil spring 54. In the opening/closing member driving device 1A described above, the output member 5 consisting of the output shaft 7 and the output gear 43 is rotatably supported by the cylindrical output gear receiving portion 65 provided on the reinforcing member 35. That is, the output gear bearing portion 65 rotatably supports the output gear 43 of the output member 5 from the outer circumferential side. On the other hand, in the opening/closing member drive device 1A of this example, the output member 5 consisting of the output shaft 7 and the output gear 43 is moved by the cylindrical output bearing portion 65A (output member receiving portion) provided on the reinforcing member 35. Rotatably supported. That is, the output bearing portion 65A rotatably supports the output shaft 7 of the output member 5 from the outer circumferential side.

In addition, in the opening/closing member driving device 1A of this example, the configurations of the reinforcing member 35, the output shaft 7, and the output gear 43 are different from the opening/closing member driving device 1, but the other configurations are the same as the opening/closing member driving device 1. Therefore, in the opening/closing member drive device 1A of this example, the reinforcing member 35, the output shaft 7, and the output gear 43 will be explained, and the explanation of the other components will be omitted. In addition, the same reference numerals are given to the components corresponding to those of the opening/closing member driving device 1 in the description.

The output shaft 7 is made of resin. As shown in FIG. 10, the output shaft 7 includes a protrusion 11 protruding from a case opening 10 of the case 9, and a base 12 housed in the case 9. The end of the toilet lid 201 is connected to the protrusion 11 of the output shaft 7 . As shown in FIG. 11, the output shaft 7 includes, in the first direction Z from one side Z1 to the other side Z2, a gear fixing part 63 that fixes the output gear 43, a bearing part 64 having a circular outer peripheral surface, and a gear fixing part 63 that fixes the output gear 43. Supported parts 68 having a circular outer peripheral surface are provided in this order. The outer diameter of the bearing portion 64 is larger than the outer diameters of the gear fixing portion 63 and the supported portion 68. A metal output gear 43 is coaxially fixed to the gear fixing portion 63 . Thereby, the output gear 43 constitutes the output member 5 together with the output shaft 7. The output member 5 is rotatably supported by a support portion 61 that protrudes from the intermediate bottom portion 31 of the intermediate case 22 to the other side Z2 in the first direction Z.

Here, the output gear 43 does not include an annular portion having no teeth on its outer peripheral surface. On the other hand, the output shaft 7 includes a bearing portion 64 having a circular outer peripheral surface on the other side Z2 of the output gear 43 in the first direction Z in the base portion 12 . As shown in FIGS. 10 and 11, the reinforcing member 35 has an output bearing portion 65A (output member receiving portion) that rotatably supports the bearing portion 64 from the outer circumferential side at the outer peripheral edge portion of the reinforcing member side opening 36. Equipped with The output bearing portion 65A is a cylindrical portion that bends and extends from the reinforcing member side opening 36 of the reinforcing member 35 to the other side Z2 in the first direction Z. The output bearing portion 65A is provided, for example, by burring. Here, as shown in FIG. 10, the end of the support part 61 on the other side Z2 in the first direction Z is further away from the end surface 35a on the one side Z1 in the first direction Z of the reinforcing member 35 on the other side in the first direction Z. Located in Z2.

In this example as well, the fourth gear 42 of the transmission mechanism 8 and the output gear 43 that meshes with the fourth gear 42 are arranged in the second direction Y. The second support shaft 48 that rotatably supports the fourth gear 42 has one end portion held by the intermediate case 22 and the other end portion held by the reinforcing member 35. That is, the intermediate bottom portion 31 of the intermediate case 22 includes a shaft holding portion 34 that holds the second support shaft 48 that supports the second gear 40 and the fourth gear 42 . The reinforcing member 35 includes a shaft holding portion 47 that holds a second support shaft 48 that supports the second gear 40 and the fourth gear 42 . Further, the reinforcing member 35 is in the second direction Y. It is fixed to the intermediate case 22 between the output bearing part 65A and the shaft holding part 47.

(effect)
According to this example, even when a load is applied to the output shaft 7, the output shaft 7 and the output gear 43 are not tilted because the output shaft 7 is supported by the reinforcing member 35. Further, since the highly rigid reinforcing member 35 supports the second support shaft 48 of the fourth gear 42 that meshes with the output gear 43, the fourth gear 42 does not tilt. Thereby, it is possible to prevent the fourth gear 42 and the output gear 43 from being displaced in a direction away from each other due to an external load, so that the meshing between the fourth gear 42 and the output gear 43 can be maintained in a normal state. Therefore, the efficiency of torque transmission to the toilet lid 201 does not deteriorate.

Further, according to the opening/closing member driving device 1A of this example, the same effects as those of the opening/closing member driving device 1 described above can be obtained.

DESCRIPTION OF SYMBOLS 1, 1A... Opening/closing member drive device, 3... Toilet lid opening/closing unit, 5... Output member, 6... Motor, 7... Output shaft, 8... Transmission mechanism, 9... Case, 10... Case opening, 11... Projecting part, 12... Base, 13... First side wall, 14... Second side wall, 15... Third side wall, 16... Fourth side wall, 21... First case, 22... Intermediate case, 23... Third case, 25... Bottom wall part , 26... Frame portion, 27... Rotating shaft, 28... Motor main body, 29... Motor terminal, 30... Bearing member, 31... Intermediate bottom portion, 32... Intermediate frame portion, 32a... First frame portion, 32b... Second frame portion , 32c...first notch, 32d...second notch, 33...middle case opening, 34...shaft holding part, 35...reinforcing member, 35a...end face, 35b, 35c...protrusion, 36...reinforcing member Side opening, 37... Potentiometer, 38... Worm, 39... First gear, 39a... First large diameter gear, 39b... First small diameter gear, 40... Second gear, 40a... Second large diameter gear, 40b... Third 2 small diameter gear, 41...Third gear, 41a...Third large diameter gear, 41b...Third small diameter gear, 42...Fourth gear (front stage gear), 43...Output gear, 43a...Annular part, 45...First support Shaft, 46...torque limiter, 47...shaft holding part, 48...second support shaft, 49...third support shaft, 50...circular recess, 51...recess, 52...projection, 53...first coil spring, 53a...th 53b...the other end of the first coil spring, 54...the second coil spring, 54a...the end of the second coil spring, 54b...the other end of the second coil spring , 55... Through hole, 56... First coil spring first locking part, 57... First coil spring second locking part, 58... Second coil spring first locking part, 59... Second coil spring second locking part, 61... Support part, 62... Circular recessed part, 63... Gear fixing part, 64... Bearing part, 65... Output gear receiving part (output member receiving part), 65A... Output bearing part (output member receiving part), 68... Bearing part Support part, 69... Output bearing part, 70... Annular groove, 71... O-ring, 73... First protrusion, 74... Second protrusion, 76... Gap, 77... Gap, 81... Potentiometer gear, 82... Detection part , 83... Board, 86... Terminal pin, 87... Terminal pin holding part, 200... Toilet unit, 201... Toilet lid, 202... Toilet main body, 203... Toilet seat, 204... Tank, X... Third direction (short side of case) direction), Y...second direction (longitudinal direction of the case), Z...first direction (axial direction)

Claims (11)

motor and
an output shaft to which the opening/closing member is connected;
a transmission mechanism that transmits the driving force of the motor to the output shaft;
a case housing the motor and the transmission mechanism;
a reinforcing member fixed to the inside of the case,
When the axial direction of the output shaft is a first direction, the output shaft has a base located within the case on one side in the first direction and protrudes from the case on the other side in the first direction. comprising a protrusion;
The transmission mechanism includes an output gear, a front gear that meshes with the output gear, and a support shaft that extends in the first direction and rotatably supports the front gear,
The output gear is coaxially fixed to the base of the output shaft and forms an output member together with the output shaft,
The reinforcing member has higher rigidity than the case, and includes an output member receiving portion that rotatably supports the output member from an outer peripheral side, and a shaft holder that supports the other end of the support shaft in the first direction. An opening/closing member driving device comprising: The output gear includes an annular portion having no teeth on the outer peripheral surface at the other end portion in the first direction,
The opening/closing member driving device according to claim 1, wherein the output member receiving portion rotatably supports the annular portion from an outer peripheral side. The output shaft includes a bearing portion having a circular outer peripheral surface on the other side of the output gear in the first direction at the base,
The opening/closing member driving device according to claim 1, wherein the output member receiving portion rotatably supports the bearing portion from an outer peripheral side. The output shaft includes a circular recess that is recessed toward the other side on an end surface on one side in the first direction,
The case includes a support part that is inserted into the circular recess and rotatably supports the output shaft and the output gear,
The end of the supporting portion on the other side in the first direction is located within the circular recess on the other side in the first direction from the end surface of the reinforcing member on the one side in the first direction. The opening/closing member driving device according to claim 2 or 3. The output shaft includes a supported portion having a circular outer peripheral surface on the other side of the output gear in the first direction at the base,
The case includes a case portion that covers the reinforcing member from the other side in the first direction,
The opening/closing member driving device according to any one of claims 2 to 4, wherein the case portion has an output bearing portion that rotatably supports the supported portion from an outer circumferential side. The case is made of resin,
The opening/closing member driving device according to any one of claims 1 to 5, wherein the reinforcing member is made of metal. The opening/closing member driving device according to any one of claims 1 to 6, wherein the output gear is made of metal. When two directions perpendicular to the first direction are a second direction and a third direction,
The output gear and the pre-stage gear are arranged along the second direction,
8. The reinforcing member is fixed to the case between the output member receiving part and the shaft holding part in the second direction. Opening/closing member drive device. The case includes a first side wall and a second side wall arranged in the third direction and extending parallel to the second direction,
The reinforcing member is disposed between the first side wall and the second side wall,
A portion not in contact with each other is provided between the reinforcing member and the first side wall,
9. The opening/closing member driving device according to claim 8, wherein a portion not in contact with each other is provided between the reinforcing member and the second side wall. has a potentiometer;
The potentiometer includes a potentiometer that meshes with one of the gears of the plurality of gears constituting the transmission mechanism on one side of the reinforcing member in the first direction, and a potentiometer that meshes with one of the gears of the plurality of gears that constitute the transmission mechanism, and the other side of the reinforcing member in the first direction. The opening/closing member driving device according to any one of claims 1 to 9, further comprising: a detection unit fixed to the potentiometer gear to detect the rotational angular position of the potentiometer gear. comprising the opening/closing member driving device according to any one of claims 1 to 10,
A toilet lid opening/closing unit, wherein the opening/closing member is a toilet lid.

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