JP2018164365A - Geared motor and opening/closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a geared motor capable of surely joining a rotary shaft and a gear member together, and an opening/closing device.SOLUTION: In a geared motor, a worm gear 85 includes a joint member 92 fixed to a motor shaft 81, and a gear member 91 formed with teeth on an outer peripheral surface 910. The gear member 91 is formed with a joint hole 911 inside of which the joint member 92 fits. Each of the joint hole 911 and the joint member 92 has an anti-slip shape capable of preventing idle rotation. The gear member 91 is made of a resin. The joint member 92 and the motor shaft 81 are made of a metal. The joint member 92 is fixed to the motor shaft 81 by press-fitting the motor shaft 81 into a fixing hole 921. The gear member 91 is provided with a magnet fixing part 912 in such a way to surround the joint hole 911. A magnet 83 is fixed to the gear member 91 in a state that it fits into the magnet fixing part 912.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a geared motor provided with a gear transmission mechanism for transmitting rotation of a motor body, and an opening / closing device provided with the geared motor.

  As an open / close device that opens and closes a toilet seat and toilet lid of a Western-style toilet, an aspect using a geared motor that transmits rotation of a motor body such as a stepping motor to an output vehicle via a gear transmission mechanism has been proposed. On the other hand, a configuration has been proposed in which a motor shaft (rotating shaft) and a worm gear (gear member) are directly connected to connect a rotating shaft such as a motor shaft of a motor body and a gear member (see Patent Document 1).

JP 2010-112414 A

  When the motor shaft (rotary shaft) and the worm gear (gear member) are directly connected as in the configuration described in Patent Document 1, a structure in which the rotational shaft is press-fitted into the hole of the gear member is employed. However, there is a problem that the rotary shaft is idled by loosening at the press-fitting portion while using the geared motor.

  In view of the above problems, an object of the present invention is to provide a geared motor and an opening / closing device capable of reliably connecting a rotating shaft and a gear member.

  In order to solve the above-described problem, a geared motor according to the present invention includes a motor main body, an output vehicle, and a gear transmission mechanism that transmits rotation output from the motor main body to the output vehicle. Any of the gears included in the transmission mechanism includes a connecting member having a fixing hole in which a rotating shaft for transmitting power is fixed inside, a tooth portion formed on an outer peripheral surface, and one of the rotating shafts in the axial direction. A gear member having a connection hole that is open toward the side and in which the connection member is fitted inside, and the inner peripheral surface of the connection hole and the outer peripheral surface of the connection member include the connection member and the gear. It has a non-rotating shape capable of preventing idling with a member.

  In the present invention, any of the gears included in the gear transmission mechanism is not directly connected to the rotation shaft, the connection member to which the rotation shaft is fixed fits into the connection hole of the gear member, and the gear member is connected to the rotation shaft and Rotates integrally with the connecting member. For this reason, unlike the case where the rotating shaft and the gear member are directly connected by press-fitting, the situation where the rotating shaft does not loosen at the press-fitted portion without processing the rotating shaft into a D-cut shape or the like does not occur. Can be securely connected.

  The present invention is particularly effective when the gear member is made of resin.

  In the present invention, the connection member and the rotation shaft may be made of metal, and the connection member may be fixed by press-fitting the rotation shaft into the fixing hole. If the connecting member and the rotating shaft are made of metal, even when the connecting member and the rotating shaft are fixed by press-fitting the rotating shaft into the fixing hole, a situation in which the connecting member and the rotating shaft are loosened at the press-fitted portion hardly occurs.

  In the present invention, a stopper member that abuts on the other end of the gear member in the axial direction to limit a movable range of the gear member to the other side in the axial direction is provided, and the connection member includes the connection member It is possible to adopt a mode in which the hole is movable in the axial direction. According to this aspect, there is an advantage that it is not necessary to press-fit the connection member into the connection hole to prevent the connection member from coming off from the connection hole.

  In the present invention, it is possible to adopt a mode in which the inner peripheral surface of the connection hole and the outer peripheral surface of the connection member have a detent shape in which at least one plane is formed.

  In the present invention, it has an annular magnet fixed to the gear and a magnetic sensor facing the magnet, and the gear member has the connection hole when viewed from a direction orthogonal to the axial direction. It is possible to adopt a mode in which a magnet fixing portion is provided so as to surround the connection hole at a position overlapping with the magnet, and the magnet is fixed to the gear member while being fitted to the magnet fixing portion. According to this aspect, unlike the case where the magnet is fixed to the rotating shaft, there is an advantage that it is not necessary to separately provide a space for arranging the magnet in the axial direction of the rotating shaft.

  In the present invention, it is possible to adopt a mode in which the magnet fixing portion is formed in a cylindrical shape having substantially the same inner peripheral surface and outer peripheral surface.

  In the present invention, the gear member includes a flange portion at a position adjacent to one side in the axial direction with respect to a portion where the tooth portion is formed, and the magnet fixing portion is moved from the flange portion to the axial direction. The magnet may be fixed to the gear member in a state in which the magnet is in contact with the flange portion from one side in the axial direction. According to this aspect, the magnet can be properly positioned in the axial direction of the rotating shaft.

  In the present invention, the gear member includes a protrusion protruding radially outward from the magnet fixing portion and on one side in the axial direction, and the protrusion fits between the inner peripheral surface and the outer peripheral surface of the magnet. A through hole is formed, and the magnet can adopt a mode in which an end portion of the projection serves as a fixed portion and is fixed to the gear member. According to this aspect, the magnet can be appropriately fixed to the gear member.

  In the present invention, the inner peripheral surface of the magnet and the outer peripheral surface of the magnet fixing portion each have a detent shape in which two planes parallel to each other are formed, and the protrusion and the through hole are formed of the magnet. In the above-described two planes, it is possible to adopt a mode provided in each of a region sandwiched between one plane and the outer peripheral surface and a region sandwiched between the other plane and the outer peripheral surface. According to this aspect, the projection can be provided in a relatively wide area of the gear member.

In the present invention, it is possible to adopt a mode in which the rotating shaft is a motor shaft provided in the motor body. According to this aspect, the rotating shaft and the gear member can be rotated integrally without processing the motor shaft into a D-cut shape or the like.
The geared motor to which the present invention is applied can be used for an opening / closing device. In this case, an opening / closing member is connected to the output vehicle.

In the present invention, any of the gears included in the gear transmission mechanism is not directly connected to the rotation shaft, the connection member to which the rotation shaft is fixed fits into the connection hole of the gear member, and the gear member is connected to the rotation shaft and Rotates integrally with the connecting member. For this reason, unlike the case where the rotating shaft and the gear member are directly connected by press-fitting, the situation where the rotating shaft does not loosen at the press-fitted portion without processing the rotating shaft into a D-cut shape or the like does not occur. Can be securely connected.

It is a perspective view of an opening / closing device (geared motor) to which the present invention is applied. It is a disassembled perspective view of the state which removed the 3rd case member from the geared motor shown in FIG. It is a disassembled perspective view of the state which removed the 2nd case member, the 3rd case member, the output vehicle, etc. from the geared motor shown in FIG. FIG. 2 is a plan view of a gear transmission mechanism and the like of the geared motor shown in FIG. 1. FIG. 5 is an exploded perspective view of the gear transmission mechanism and the like shown in FIG. 4. It is a perspective view when the motor main body etc. shown in FIG. 4 are seen from the side where a worm gear is located. It is a disassembled perspective view of the state which removed the gear member of the worm gear from the motor main body shown in FIG. It is a disassembled perspective view of the state which removed the gear member, the magnet, and the connection member from the motor main body shown in FIG. It is the perspective view which looked at the worm gear etc. shown in FIG. 6 from the motor main body side. It is a disassembled perspective view of the worm gear etc. which are shown in FIG.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, three directions intersecting each other will be described as an X direction, a Y direction, and a Z direction, respectively. In the present embodiment, the X direction, the Y direction, and the Z direction are orthogonal to each other, and the Z direction is a direction in which the rotation center axis (axis line L5) of the output wheel 5 extends. The Y direction is a direction in which the motor shaft 81 of the motor body 80 extends. Also, X1 is attached to one side in the X direction, X2 is attached to the other side in the X direction, Y1 is attached to one side in the Y direction, Y2 is attached to the other side in the Y direction, Z1 is attached to the side, and Z2 is attached to the other side in the Z direction. In the drawings referred to below, the teeth formed on each gear are not shown.

(Overall configuration and case configuration)
FIG. 1 is a perspective view of an opening / closing device 1 (geared motor 3) to which the present invention is applied. FIG. 2 is an exploded perspective view of the geared motor 3 shown in FIG. 1 with the third case member 30 removed. FIG. 3 is an exploded perspective view of the geared motor 3 shown in FIG. 1 with the second case member 20, the third case member 30, the output wheel 5, etc. removed.

  The opening / closing device 1 shown in FIG. 1 has a geared motor 3, and the opening / closing member 2 is connected to a connecting shaft 51 of an output wheel 5 protruding from the case 4 in the geared motor 3. Therefore, when the output wheel 5 rotates around the axis L5 (rotation center axis), the opening / closing member 2 rotates around the axis L5 in the opening direction and the closing direction. The opening / closing member 2 is, for example, a toilet seat or a toilet lid of a Western-style toilet. In this case, the geared motor 3 is arranged so that the axis L5 of the output wheel 5 is horizontal.

  As shown in FIGS. 1, 2, and 3, the geared motor 3 has a substantially rectangular parallelepiped case 4, and the case 4 is sequentially stacked from one side Z <b> 1 to the other side Z <b> 2 in the Z direction. It has the 1st case member 10, the 2nd case member 20, and the 3rd case member 30 which are arrange | positioned. The first case member 10, the second case member 20, and the third case member 30 are all made of resin. The first case member 10 includes a rectangular first end plate portion 11 and four first side plate portions 12 bent from the edge of the first end plate portion 11 to the other side in the Z direction. A gear transmission mechanism 40, which will be described later with reference to the above, is accommodated inside.

  As shown in FIGS. 2 and 3, the second case member 20 includes a second end plate portion 21 that faces the first end plate portion 11 of the first case member 10 and an edge of the second end plate portion 21. 1 has a second side plate portion 22 bent toward the case member 10. In the second case member 20, the first end plate portion 11 has a portion corresponding to the corner portion 4 a of the case 4 located on one side X <b> 1 in the X direction and one side Y <b> 1 in the Y direction facing the first case member 10. The edge of the bottom plate portion 280 of the recess 28 and the edge of the second end plate portion 21 are connected by the second side plate portion 23. In the second side plate portion 23, the end portion on the other side Z <b> 2 in the Z direction connected to the second end plate portion 21 protrudes from the edge of the second end plate portion 21 to constitute a stepped portion 230.

  When the second case member 20 configured in this way is placed on the first case member 10 from the other side Z2 in the Z direction, the second case member 20 has the edge of the bottom plate portion 280 and the second side plate portions 22 and 23 being the first. It contacts the first side plate portion 12 of the case member 10. In this state, the first case member 10 and the second case member 20 are fixed by screws (not shown) or the like.

  In the second case member 20, the bottom plate portion 280 is formed with a step portion 283 extending in the Y direction at an intermediate position in the X direction. In the bottom plate portion 280, the step portion 283 extends to one side X 1 in the X direction. The first bottom plate portion 281 located is located closer to the first case member 10 (one side in the Z direction) than the second bottom plate portion 282 located on the other side X2 in the X direction from the step portion 283. Corresponding to this shape, a step portion 120 is formed on the first side plate portion 12 of the first case member 10.

  In the bottom plate portion 280, an opening 24 is formed at a portion where the end portion of the other side Y2 in the Y direction of the step portion 283 is located so as to straddle the first bottom plate portion 281 and the second bottom plate portion 282. Cutouts 241 and 242 are formed in a portion of the two side plate portion 23 connected to the opening 24. The bottom plate portion 280 is formed with a plate-like partition wall 285 extending in the Y direction along the step portion 283. The first bottom plate portion 281 and the second bottom plate portion 282 are separated from each other by the partition wall 285. It is partitioned by. The partition wall 285 extends toward the other side Y2 in the Y direction up to a position reaching the edge of the opening 24. From the end of the second side plate portion 23 on the other side Z2 in the Z direction, a substantially triangular support plate portion projecting to one side Y1 in the Y direction so as to cover a part of the opening 24 from the other side Z2 in the Z direction. 25 is formed, and the support plate portion 25 is connected to the partition wall 285.

  The third case member 30 includes a third end plate portion 31 that covers the concave portion 28 of the second case member 20 from the other side Z2 in the Z direction, and a bottom plate portion 280 of the second case member 20 from the edge of the third end plate portion 31. And a third side plate portion 32 bent so as to contact the outer edge of the first side plate portion. A step portion 321 corresponding to the step portion 283 of the bottom plate portion 280 is formed at the distal end portion of the third side plate portion 32. The third case member 30 overlaps the second case member 20 in a state where the edge of the third end plate portion 31 is in contact with the step portion 230 formed on the second side plate portion 23 of the second case member 20, The member 20 and the third case member 30 are fixed by screws (not shown) or the like. In this state, the third end plate portion 31 of the third case member 30 overlaps the support plate portion 25 and the partition wall 285 of the second case member 20.

(Configuration of support structure for output vehicle 5 etc.)
The output wheel 5 is disposed in the corner 4a of the case 4 on one side X1 in the X direction and one side Y1 in the Y direction, and the tooth portion 52 of the output wheel 5 is the second portion of the second case member 20. It is located in a space sandwiched between the first bottom plate portion 281 and the third end plate portion 31 of the third case member 30.

The first bottom plate portion 281 of the second case member 20 is formed with a cylindrical bearing portion 27 protruding to the other side Z2 in the Z direction, while the toothed portion 52 is formed in the output wheel 5. The part is formed with a circular hole 520 that opens toward one side Z1 in the Z direction. Accordingly, the bearing portion 27 fits into the hole 520 of the output wheel 5 and rotatably supports the output wheel 5. Further, the third end plate portion 31 of the third case member 30 is formed with a circular hole 315 that overlaps the bearing portion 27 of the second case member 20 on the other side Z2 in the Z direction. The connecting shaft 51 of the output wheel 5 protrudes toward the other side Z2 in the Z direction.

  A sensor gear 61 is disposed in a space sandwiched between the second bottom plate portion 282 of the second case member 20 and the third end plate portion 31 of the third case member 30. In the sensor gear 61, the shaft portion 611 protruding to the one side Z1 in the Z direction is rotatably supported by a shaft hole 286 formed in the second bottom plate portion 282, and protrudes to the other side Z1 of the sensor gear 61 in the Z direction. The shaft portion 612 is rotatably supported by a shaft hole (not shown) formed in the third end plate portion 31 of the third case member 30. A rotation detector 63 mounted on the sensor substrate 62 is connected to the shaft portion 612 of the sensor gear 61. In this embodiment, the rotation detector 63 is a potentiometer. The sensor substrate 62 is fixed to the second side plate portion 23 of the second case member 20.

(Configuration of gear transmission mechanism 40 and the like)
4 is a plan view of the gear transmission mechanism 40 and the like of the geared motor 3 shown in FIG. FIG. 5 is an exploded perspective view of the gear transmission mechanism 40 and the like shown in FIG. As shown in FIGS. 4 and 5, between the first case member 10 and the second case member 20 (inside the second case member 20), a motor main body 80 as a drive source, and the rotation of the motor main body 80. Is transmitted to the output wheel 5. In this embodiment, the motor body 80 is a stepping motor. The motor body 80 has the end portion of the motor body 810 fixed by the fixing plate 16 with the motor shaft 81 facing the other side Y2 in the Y direction on the other side X2 in the X direction of the first case member 10. A worm gear 85 having a spiral groove formed on the outer circumferential surface and an annular magnet 83 for detecting rotation are fixed to the motor shaft 81, and the tip of the worm gear 85 is rotatably supported by the bearing member 17. Has been. A magnetic sensor 72 mounted on the substrate 71 is disposed on the side of the magnet 83, and the magnetic sensor 72 and the magnet 83 are opposed to each other. In this embodiment, the magnetic sensor 72 is a Hall element, and the substrate 71 on which the magnetic sensor 72 is mounted is disposed at two positions with an angle range of 90 ° with the motor shaft 81 as the rotation center.

  The gear transmission mechanism 40 meshes with the worm gear 85, the first gear 41 that meshes with the worm gear 85, the second gear 42 that meshes with the first gear 41, the third gear 43 that meshes with the second gear 42, and the third gear 43. The fourth gear 44 is a final gear that meshes with the output wheel 5.

  The first gear 41 includes a first member 411 that is a worm wheel that meshes with the worm gear 85, and a second member 412 that is disposed concentrically with the first member 411. The second member 412 is a first member. 411 is provided on one side Z1 in the Z direction. The second member 412 includes a tooth portion 413 having a gear formed on the outer peripheral surface, and a cylindrical portion 414 surrounding the end portion of the first member 411. The end portion of the first member 411 and the cylindrical portion 414 are provided. Between them, a torque limiter (not shown) is configured. Therefore, in normal times, the first member 411 and the second member 412 rotate together, but when a large load is applied to the second member 412, the first member 411 is idle relative to the second member 412. To do.

The second gear 42 is a compound gear that includes a large-diameter gear 421 that meshes with the second member 412 of the first gear 41 and a small-diameter gear 422 that is smaller in diameter than the large-diameter gear 421. The small-diameter gear 422 is a large-diameter gear. It is provided on the other side Z2 in the Z direction with respect to 421. The third gear 43 is a compound gear that includes a large-diameter gear 431 that meshes with the small-diameter gear 422 of the second gear 42 and a small-diameter gear 432 that is smaller in diameter than the large-diameter gear 431. The small-diameter gear 432 is a large-diameter gear 431. Is provided on one side Z1 in the Z direction. The fourth gear 44 is a composite gear that includes a large-diameter gear 441 that meshes with the small-diameter gear 432 of the third gear 43 and a small-diameter gear 442 that is smaller in diameter than the large-diameter gear 441. The small-diameter gear 442 is a large-diameter gear 441. Is provided on the other side Z2 in the Z direction. The small diameter gear 442 of the fourth gear 44 meshes with the tooth portion 52 of the output wheel 5 and the tooth portion 610 of the sensor gear 61, and the large diameter gear 441 is the tooth portion 52 of the output wheel 5 and the tooth portion of the sensor gear 61. It is located on one side in the Z direction from 610.

  As shown in FIG. 4, the output wheel 5 includes a side plate portion (first case member 10) of the case 4 from the first gear 41, the second gear 42, the third gear 43, and the fourth gear 44 used in the gear transmission mechanism 40. The distance between the first side plate portion 11 and the third side plate portion 32 of the third case member 30 is narrow. For this reason, it is difficult to further increase the diameter of the tooth portion 52 of the output wheel 5 to increase the reduction ratio from the fourth gear 44 at the final stage to the output wheel 5.

(Configuration of support structure of fourth gear 44)
In the gear transmission mechanism 40, the first gear 41, the second gear 42, the third gear 43, and the fourth gear 44 are rotatably supported by the support shafts 410, 420, 430, and 440, respectively. Here, the support shafts 410, 420, and 430 that support the first gear 41, the second gear 42, and the third gear 43 are both ends of the first end plate portion 11 of the first case member 10 and the second case member 20. The second end plate portion 21 is held.

  On the other hand, the support shaft 440 that supports the fourth gear 44 has one end (the end on one side Z1 in the Z direction) at the shaft hole (not shown) of the first end plate portion 11 of the first case member 10. ) And the other end 440b (the end portion on the other side Z2 in the Z direction) is held by the overlapping portion of the support plate portion 25 of the second case member 20 and the third end plate portion 31 of the third case member 30. ing. In this embodiment, a shaft hole 258 into which the support shaft 440 is fitted is formed in the support plate portion 25 as a through hole. Further, a shaft hole (not shown) that overlaps the shaft hole 258 is formed in the third end plate portion 31 of the third case member 30, and the other end 440 b of the support shaft 440 is formed in the support plate portion 25. The shaft hole 258 is retained by being fitted into the shaft hole formed in the third end plate portion 31 of the third case member 30. For this reason, the first case member 10, the second case member 20, and the third case member 30 are accurately positioned by the support shaft 440. Accordingly, the plurality of gears of the gear transmission mechanism 40 are properly positioned with reference to the support shaft 440 that supports the fourth gear 44, so that the gears mesh properly. Further, in the portion where the other end of the support shaft 440 is held, the support plate portion 25 of the second case member 20 and the third end plate portion 31 of the third case member 30 can be reinforced. In particular, in this embodiment, since the notch 241 is formed in the second case member 20, the support plate portion 25 is not sufficiently supported, but even in that case, the support plate portion 25 is not connected to the third case member 30. The third end plate portion 31 is reinforced. Therefore, even when a large force is applied to the support shaft 440, the support plate portion 25 can withstand the force.

  In the fourth gear 44, the radius of the large-diameter gear 441 is larger than the sum of the radius of the small-diameter gear 442 and the radius of the tooth portion 52 of the output wheel 5. For this reason, when viewed from the Z direction, the bearing portion 27 for the output wheel 5 overlaps with the large-diameter gear 441 of the fourth gear 44. Even in such a case, in the present embodiment, the fourth gear 44 is disposed between the first case member 10 and the second case member 20, while the output wheel 5 includes the second case member 20 and the third case. It is arranged between the members 30. When the fourth gear 44 is disposed inside the opening 24 of the second case member 20, the large-diameter gear 441 of the fourth gear 44 is connected to the first end plate portion 11 of the first case member 10 and the second case member. It is located between the 20 bottom plate portions 280. Further, a part of the small diameter gear 442 of the fourth gear 44 is located in a space sandwiched between the first bottom plate portion 281 and the third end plate portion 31 of the third case member 30 through the notch 242. Accordingly, the small diameter gear 442 of the fourth gear 44 and the tooth portion 52 of the output wheel 5 can be engaged with each other.

Further, a part of the small diameter gear 442 of the fourth gear 44 is located in a space sandwiched between the second bottom plate portion 282 and the third end plate portion 31 of the third case member 30 via the notch 241. The small diameter gear 442 of the fourth gear 44 and the tooth portion 610 of the sensor gear 61 can be meshed with each other. Even in this case, since the partition wall 285 is provided between the output gear 5 and the sensor gear 61 that meshes with the fourth gear 44 at the final stage, a lubricant such as grease is applied to the tooth portion 52 of the output wheel 5. Even in this case, the lubricant is difficult to adhere to the sensor gear 61. In addition, since the support plate portion 25 of the second case member 20 that supports the fourth gear 44 at the final stage is connected to the partition wall 285, the support plate portion 25 can be reinforced by the partition wall 285.

(Operation)
In the geared motor 3 and the opening / closing device 1 configured as described above, when the motor shaft 81 is rotated by supplying power to the motor main body 80, the rotation is decelerated by the gear transmission mechanism 40 and transmitted to the output wheel 5. The opening / closing member 2 rotates in the opening direction and the closing direction. At that time, the rotation detector 63 detects the rotation of the fourth gear 44 and detects the rotation position of the output wheel 5.

(Detailed configuration of worm gear 85, etc.)
FIG. 6 is a perspective view of the motor main body 80 and the like shown in FIG. 4 as viewed from the side where the worm gear 85 is located. FIG. 7 is an exploded perspective view of the motor main body 80 shown in FIG. 6 with the gear member 91 of the worm gear 85 removed. FIG. 8 is an exploded perspective view of the motor main body 80 shown in FIG. 6 with the gear member 91, the magnet 83, and the connecting member 92 removed. FIG. 9 is a perspective view of the worm gear 85 and the like shown in FIG. 6 as viewed from the motor body 80 side. FIG. 10 is an exploded perspective view of the worm gear 85 and the like shown in FIG.

  As will be described below with reference to FIGS. 6 to 10, any of the gears included in the gear transmission mechanism 40 described with reference to FIGS. 4 and 5 has a rotating shaft that transmits power and an outer peripheral surface. It has the structure where the gear member in which the tooth | gear part was formed was connected via the connection member. In this embodiment, the worm gear 85 has a structure in which a motor shaft 81 (rotating shaft) and a gear member 91 having a helical tooth portion (not shown) formed on the outer peripheral surface 910 are connected via a connecting member 92. It has become.

  More specifically, the worm gear 85 has a connection member 92 formed with a fixing hole 921 in which the motor shaft 81 is fixed inside, and a connection member that opens toward one side L81a in the direction of the axis L81 of the motor shaft 81. 92 has a gear member 91 formed with a connection hole 911 fitted inside, and a helical tooth portion (not shown) is formed on the outer peripheral surface 910 of the gear member 91. The gear member 91 is made of resin. The connecting member 92 and the motor shaft 81 are made of metal. Therefore, the motor shaft 81 and the connecting member 92 are fixed by press-fitting the motor shaft 81 into the fixing hole 921.

  The inner peripheral surface of the connection hole 911 and the outer peripheral surface of the connection member 92 have a detent shape that can prevent the connection member 92 and the gear member 91 from spinning idle. In this embodiment, the inner peripheral surface of the connection hole 911 and the outer peripheral surface of the connection member 92 have a detent shape in which at least one flat surface 911a, 92a is formed. In this embodiment, the inner peripheral surface of the connection hole 911 and the outer peripheral surface of the connection member 92 have a detent shape in which two parallel planes 911a and 92a are formed, and both ends of the two planes 911a and 92a. Are connected via an arcuate surface.

  Here, the connection member 92 is not press-fitted into the connection hole 911 and can move in the direction of the axis L81 inside the connection hole 911. However, since the bearing member 17 shown in FIG. 6 is in contact with the tip end portion 918 of the gear member 91 (the end portion on the other side L81b in the direction of the axis L81) as a stopper member, the other end of the gear member 91 in the direction of the axis L81. The movable range to the side L81b is limited. Therefore, the connection member 92 does not come out of the connection hole 911 of the gear member 91.

The gear member 91 configured as described above is provided with a magnet fixing portion 912 so as to surround the connection hole 911 at a position overlapping the connection hole 911 when viewed from the direction orthogonal to the direction of the axis L81. An annular magnet 83 is fixed to the outer peripheral side of the fixed portion 912.

  The magnet fixing portion 912 is formed in a cylindrical shape having substantially the same inner peripheral surface and outer peripheral surface. For this reason, the outer peripheral surface of the magnet fixing portion 912 has a detent shape having two flat surfaces 912a parallel to each other, and the flat surfaces 912a and 911a are parallel to each other. Moreover, both ends of the two flat surfaces 912a are connected via an arc-shaped surface.

  In addition, the hole 831 in which the magnet fixing portion 912 is fitted in the magnet 83 has the same shape and substantially the same size as the magnet fixing portion 912. Therefore, the hole 831 of the magnet 83 has a detent shape having two planes 831a parallel to each other, and both ends of the two planes 831a are connected via an arcuate surface.

  In this embodiment, the gear member 91 includes a circular flange portion 913 at a position adjacent to the portion where the tooth portion is formed on one side L81a in the direction of the axis L81, and the magnet fixing portion 912 includes the flange portion. 913 protrudes to one side L81a in the direction of the axis L81. Accordingly, the magnet 83 is fixed to the gear member 91 in a state in which the magnet 83 is in contact with the flange portion 913 from the one side L81a in the direction of the axis L81. In this embodiment, the flange portion 913 and the magnet 83 have the same outer diameter.

  In fixing the magnet 83 to the magnet fixing portion 912, a method such as adhesion or caulking can be employed, and welding (thermal caulking) is employed in this embodiment. More specifically, the gear member 91 is formed with a protrusion 914 that protrudes from the flange portion 913 to the one side L81a in the direction of the axis L81 on the outer side in the radial direction than the magnet fixing portion 912. On the other hand, the magnet 83 has a through hole 834 into which the protrusion 914 fits between the inner peripheral surface and the outer peripheral surface. Therefore, at least the end portion 914a of the protrusion 914 is plastically deformed by heating and melting, whereby the end portion 914a (see FIG. 9) of the protrusion 914 becomes a fixing portion, and the magnet 83 is fixed to the magnet fixing portion 912. Therefore, the magnet 83 can be properly fixed to the gear member 91.

  The protrusion 914 and the through hole 834 are sandwiched between the two planes 831 a of the magnet 83, the region sandwiched between one plane 831 a and the outer peripheral surface of the magnet 83, and the other plane 831 a and the outer peripheral surface of the magnet 83. Provided in each of the areas. For this reason, since the protrusion 914 can be provided in a relatively wide region of the gear member 91, the thick protrusion 914 can be provided. Therefore, the magnet 83 can be firmly fixed to the gear member 91.

(Main effects of this form)
As described above, in the geared motor 3 of the present embodiment, the worm gear 85 included in the gear transmission mechanism 40 is not directly connected to the motor shaft 81 (rotary shaft), and the connection member 92 fixed to the motor shaft 81 is provided. The gear member 91 fits into the connection hole 911 of the gear member 91 and rotates together with the motor shaft 81 and the connection member 92. For this reason, unlike the case where the motor shaft 81 and the gear member 91 are directly connected by press-fitting, the motor shaft 81 is not loosened at the press-fitted portion without being processed into a D-cut shape or the like. And the gear member 91 can be reliably connected. In particular, when the gear member 91 is made of resin and the motor shaft 81 and the gear member 91 are directly connected by press-fitting, a situation of loosening at the press-fitted portion is likely to occur, but according to the present embodiment, such a situation is unlikely to occur. .

Further, since the connecting member 92 and the motor shaft 81 are made of metal, it is possible to adopt a mode in which the connecting member 92 is fixed to the motor shaft 81 by press-fitting the motor shaft 81 into the fixing hole 921. Even in this case, since the connection member 92 and the motor shaft 81 are made of metal, it is difficult to cause a situation where the connection member 92 and the motor shaft 81 are loosened at the press-fitted portion.

  The gear member 91 is provided with a magnet fixing portion 912 so as to surround the connection hole 911, and the magnet 83 is fixed to the gear member 91 in a state of being fitted to the magnet fixing portion 912. Therefore, unlike the case where the magnet 83 is fixed to the motor shaft 81, there is an advantage that it is not necessary to provide a space for arranging the magnet 83 in the direction of the axis L81 of the motor shaft 81.

  Further, since the magnet 83 is fixed to the gear member 91 in a state of being in contact with the flange portion 913 of the gear member 91, the magnet 83 can be properly positioned.

[Other embodiments]
In the above embodiment, the present invention is applied to the worm gear 85. However, the present invention may be applied to a case where a spur gear or the like is connected to the motor shaft 81. In the above embodiment, the present invention is applied to the worm gear 85, but the present invention may be applied to other gears included in the gear transmission mechanism 40.

DESCRIPTION OF SYMBOLS 1 ... Opening / closing device, 2 ... Opening / closing member, 3 ... Geared motor, 4 ... Case, 5 ... Output wheel, 10 ... 1st case member, 16 ... Fixed plate, 17 ... Bearing member (stopper part), 20 ... 2nd case Members, 25 ... support plate portion, 27 ... bearing portion, 30 ... third case member, 40 ... gear transmission mechanism, 41 ... first gear, 42 ... second gear, 43 ... third gear, 44 ... fourth gear, DESCRIPTION OF SYMBOLS 71 ... Board | substrate, 72 ... Magnetic sensor, 80 ... Motor main body, 81 ... Motor shaft, 83 ... Magnet, 85 ... Worm gear, 91 ... Gear member, 92 ... Connection member, 92a, 831a, 911a, 912a ... Plane, 831 ... Hole , 834 ... through hole, 910 ... outer peripheral surface, 911 ... connection hole, 912 ... magnet fixing part, 913 ... flange part, 914 ... projection, 918 ... tip part, 921 ... fixing hole, L5 ... axis

Claims (12)

A motor body;
An output car,
A gear transmission mechanism for transmitting rotation output from the motor body to the output vehicle;
Have
Any of the gears included in the gear transmission mechanism includes a connecting member formed with a fixing hole in which a rotating shaft that transmits power is fixed inside, and a tooth portion formed on an outer peripheral surface, and an axial direction of the rotating shaft A gear member having a connection hole that is open toward one side of the connection hole and the connection member is fitted inside, and
The geared motor according to claim 1, wherein the inner peripheral surface of the connection hole and the outer peripheral surface of the connection member have a non-rotating shape capable of preventing idle rotation of the connection member and the gear member.   The geared motor according to claim 1, wherein the gear member is made of resin. The connecting member and the rotating shaft are made of metal,
The geared motor according to claim 1, wherein the connection member is fixed by press-fitting the rotating shaft into the fixing hole. A stopper member that abuts against the other end of the gear member in the axial direction and restricts a movable range of the gear member to the other side in the axial direction;
The geared motor according to any one of claims 1 to 3, wherein the connection member is movable in the axial direction through the connection hole.   The inner peripheral surface of the connection hole and the outer peripheral surface of the connection member have a detent shape in which at least one flat surface is formed. Geared motor. An annular magnet fixed to the gear;
A magnetic sensor facing the magnet;
Have
The gear member is provided with a magnet fixing portion so as to surround the connection hole at a position overlapping the connection hole when viewed from a direction orthogonal to the axial direction.
The geared motor according to any one of claims 1 to 5, wherein the magnet is fixed to the gear member in a state of being fitted to the magnet fixing portion.   The geared motor according to claim 6, wherein the magnet fixing portion is formed in a cylindrical shape having substantially the same inner peripheral surface and outer peripheral surface. The gear member includes a flange portion at a position adjacent to one side in the axial direction with respect to a portion where the tooth portion is formed,
The magnet fixing part protrudes from the flange part to one side in the axial direction,
The geared motor according to claim 6 or 7, wherein the magnet is fixed to the gear member in a state in which the magnet is in contact with the flange portion from one side in the axial direction. The gear member is provided with a protrusion that protrudes radially outward from the magnet fixing portion to one side in the axial direction,
The magnet has a through-hole into which the protrusion fits between an inner peripheral surface and an outer peripheral surface,
The geared motor according to any one of claims 6 to 8, wherein the magnet is fixed to the gear member with an end portion of the protrusion serving as a fixed portion. Each of the inner peripheral surface of the magnet and the outer peripheral surface of the magnet fixing portion has a detent shape in which two planes parallel to each other are formed.
The protrusion and the through hole are a region sandwiched between one of the two planes and the outer peripheral surface of the magnet, and a region sandwiched between the other plane and the outer peripheral surface of the magnet. The geared motor according to claim 9, wherein each of the geared motors is provided.   The geared motor according to any one of claims 1 to 10, wherein the rotating shaft is a motor shaft provided in the motor body. An opening / closing apparatus comprising the geared motor according to any one of claims 1 to 11,
An opening / closing device, wherein an opening / closing member is connected to the output vehicle.

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