Geared motor and switch

Abstract

A gear transmission motor and an opening and closing device can improve the positioning accuracy of housing components used in a housing and strengthen the housing components. In a gear transmission motor (3), a housing (4) includes a first housing component (10), a second housing component (20) and a third housing component (30) which are arranged overlappingly in the Z direction. A fourth gear (44) of the final stage is arranged between the first housing component and the second housing component, and an output wheel (5) is arranged between the second housing component and the third housing component. One end (440a) of a support shaft (440) supporting the fourth gear so as to be rotatable is retained in the first housing component, and the other end (440b) is retained in the portion where the support plate portion (25) of the second housing component overlaps with the third end plate portion (31) of the third housing component in an axial hole (258) formed by a through hole of the second housing component and an axial hole (318) of the third housing component.

Description

Technical Field

[0001] The present invention relates to a geared motor and a switch device including the geared motor. In the geared motor, a plurality of gears are rotatably supported by a housing member. Background Art

[0002] Regarding an opening and closing device for opening and closing a toilet seat or toilet lid of a Western-style toilet, the following scheme has been proposed: the rotation of a motor body such as a stepping motor is transmitted to an output wheel via a gear transmission mechanism. In the above-mentioned opening and closing device, a plurality of gears used in the gear transmission mechanism are supported to rotate by a support shaft of the first housing member and the second housing member among the three members (the first housing member, the second housing member, and the third housing member) used for the housing, a support shaft of the second housing member and the third housing member, and a support shaft of the first housing member and the third housing member (see Patent Document 1). Regarding the gear transmission motor of the above-mentioned structure, the following structure has been proposed: a protrusion formed at the end of a housing member is embedded in a hole of another housing member to align the positions of the housing members with each other.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-15841 Summary of the invention

[0006] However, in a structure where a protrusion formed at the end of a housing member is inserted into a hole of another housing member to align the positions of the housing members, the position of the support shaft is prone to error due to the positioning error of the housing members because the tolerance between the protrusion and the hole causes a deviation. This is not ideal because the above error may cause an error in the meshing of the gears in the gear transmission mechanism. In addition, in a case where all support shafts are configured to be held at both ends in two of the three housing members, the strength of the portion of the housing member that holds the support shaft may be insufficient.

[0007] In view of the above problems, the technical problem of the present invention is to provide a gear transmission motor and a switch device that can improve the positioning accuracy of housing components used in the housing and strengthen the housing components.

[0008] In order to solve the above technical problems, the gear transmission motor of the present invention includes: a housing; a motor body, the motor body is held in the housing; a gear transmission mechanism, the gear transmission mechanism has a plurality of gears, the plurality of gears are supported by the housing so as to be rotatable, and the rotation output from the motor body is transmitted on the inner side of the housing; and an output wheel, the output wheel is meshed with the final gear among the plurality of gears, the housing includes a first housing member, a second housing member and a third housing member arranged in sequence along the direction of the rotation center axis of the output wheel, one end of a support shaft that supports a gear included in the gear transmission mechanism so as to be rotatable is held in the first housing member, and the other end is held in the second housing member and the third housing member at a portion where the second housing member and the third housing member overlap.

[0009] In the present invention, since one end of the support shaft is held by the first housing member and the other end is held by the second housing member and the third housing member at the portion where the second housing member and the third housing member overlap, the first housing member, the second housing member and the third housing member are positioned with high precision by the support shaft. Therefore, since the plurality of gears of the gear transmission mechanism are properly positioned with the support shaft as a reference, the gears are properly meshed with each other. In addition, since the other end of the support shaft is held by the second housing member and the third housing member at the portion where the second housing member and the third housing member overlap, the portion where the support shaft is held in the second housing member and the third housing member can be strengthened.

[0010] In the present invention, a structure can be adopted in which the support shaft rotatably supports the final gear.

[0011] In the present invention, a configuration can be adopted in which the output wheel is rotatably supported by a bearing portion formed in the second housing member in a state in which a tooth portion meshing with the final gear is arranged between the second housing member and the third housing member.

[0012] In the present invention, the following structure can be adopted: the tooth portion of the final gear that meshes with the gear of the previous stage is arranged between the first housing member and the second housing member at a position overlapping with the bearing portion in the direction of the rotation center axis. Even with the above structure, the output wheel and the final gear can be appropriately supported so as to be rotatable.

[0013] In the present invention, the following structure can be adopted: a sensor gear is provided, the sensor gear meshes with the final gear, and the second housing member includes a partition wall, the partition wall separates the output wheel from the sensor gear. According to the above structure, even when a lubricant such as grease is applied to the teeth of the output wheel, the lubricant is not easily attached to the sensor gear.

[0014] In the present invention, a structure can be adopted in which a portion of the second housing member that supports the support shaft is connected to the partition wall. According to the above structure, the portion of the second housing member that supports the support shaft can be reinforced by the partition wall.

[0015] In the present invention, it is more desirable that the one end of the support shaft is held in the shaft hole of the first housing member, and the other end is held in the shaft holes of the second housing member and the shaft holes of the third housing member. In the above case, it is more desirable that the one end of the support shaft is fixed by being pressed into the shaft hole of the first housing member, and the other end is fixed by being pressed into the shaft hole of the third housing member. If the above structure is adopted, the support shaft can be reliably held relative to the housing (the first housing member, the third housing member), and the first housing member, the second housing member, and the third housing member are positioned more accurately by the support shaft.

[0016] In the present invention, preferably, the shaft hole of the second housing member is a through hole, and at least a portion of an outer peripheral surface of the support shaft is in contact with an inner peripheral surface of the shaft hole of the second housing member.

[0017] In the present invention, a structure can be adopted in which a gap between the output wheel and the side plate portion of the housing is smaller than a gap between the plurality of gears and the side plate portion of the housing.

[0018] In the present invention, a structure can be adopted in which the output wheel is arranged at a corner portion sandwiched between two adjacent side plate portions extending in directions intersecting each other in the housing.

[0019] The geared motor to which the present invention is applied can be used in an opening and closing device. In this case, the output wheel is connected to the opening and closing member.

[0020] In the present invention, since one end of the support shaft is held by the first housing member and the other end is held by the second housing member and the third housing member at the portion where the second housing member and the third housing member overlap, the first housing member, the second housing member and the third housing member are positioned with high precision by the support shaft. Therefore, since the plurality of gears of the gear transmission mechanism are properly positioned with the support shaft as a reference, the gears are properly meshed with each other. In addition, since the other end of the support shaft is held by the second housing member and the third housing member at the portion where the second housing member and the third housing member overlap, the portion where the support shaft is held in the second housing member and the third housing member can be strengthened. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a perspective view of a switch device (geared motor) to which the present invention is applied.

[0022] Figure 2 is from Figure 1An exploded perspective view of the geared motor shown in FIG. 1 with the third housing member removed.

[0023] Figure 3 is from Figure 1 The exploded perspective view shows a gear transmission motor with the third housing member and the output wheel etc. removed therefrom.

[0024] Figure 4 is from Figure 1 The exploded perspective view shows a gear transmission motor with the second housing member, the third housing member, the output wheel, etc. removed from it.

[0025] Figure 5 It is viewed from one side in the Z direction. Figure 1 A three-dimensional view of the second shell component and the third shell component shown.

[0026] Figure 6 It is schematically indicated Figure 1 An explanatory diagram of the support structure of the output wheel and the fourth gear of the final stage in the geared motor shown.

[0027] Figure 7 yes Figure 1 A top view of the gear transmission mechanism, etc. of the geared motor shown.

[0028] Figure 8 yes Figure 7 A stereoscopic view of the gear transmission mechanism, etc. shown.

[0029] Fig. 9 yes Figure 7 An exploded perspective view of the gear transmission mechanism, etc. shown.

[0030] (Explanation of symbols)

[0031] 1 opening and closing device; 2 opening and closing member; 3 gear transmission motor; 4 housing; 4a corner; 5 output wheel; 10 first housing member; 11 first end plate; 12 first side plate; 20 second housing member; 21 second end plate; 22, 23 second side plate; 24 opening; 25 support plate; 27 bearing portion; 28 recess; 30 third housing member; 31 third end plate; 32 third side plate; 40 gear transmission mechanism; 41 first gear; 42 second gear; 52, 413, 610 tooth portion; 43 third gear; 44 fourth gear; 51 connecting shaft; 61 sensor gear; 62 sensor substrate; 63 rotation detector; 80 motor body; 83 magnet; 85 worm; 118, 258, 286, 317, 318 shaft hole; 241, 242 notch; 280 Bottom plate portion; 281 first bottom plate portion; 282 second bottom plate portion; 285 partition wall; 440 support shaft; 441 worm wheel; 441 large diameter gear; 442 small diameter gear; 440a one end; 442 the other end; L5 axis line. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described with reference to the accompanying drawings. In addition, in the following description, three directions that intersect with each other are described as the X direction, the Y direction, and the Z direction. In the present embodiment, the X direction, the Y direction, and the Z direction are mutually orthogonal directions, and the Z direction is the direction in which the rotation center axis (axis L5) of the output wheel 5 extends. In addition, X1 is marked on one side of the X direction, X2 is marked on the other side of the X direction, Y1 is marked on one side of the Y direction, Y2 is marked on the other side of the Y direction, Z1 is marked on one side of the Z direction, and Z2 is marked on the other side of the Z direction for description. In addition, in the drawings referred to below, the illustration of the teeth formed on each gear is omitted.

[0033] (Overall structure and shell structure)

[0034] Figure 1 It is a perspective view of the opening and closing device 1 (geared motor 3) to which the present invention is applied. Figure 2 is from Figure 1 The exploded perspective view is a state where the third housing member 30 is removed from the geared motor 3 shown. Figure 3 is from Figure 1 The illustrated exploded perspective view is a state in which the third housing member 30 and the output wheel 5 are removed from the geared motor 3 . Figure 4 is from Figure 1 The illustrated gear transmission motor 3 is an exploded perspective view of a state where the second housing member 20, the third housing member 30, the output wheel 5, etc. are removed from the gear transmission motor 3. Figure 5 It is viewed from one side in the Z direction. Figure 1 The second housing component 20 and the third housing component 30 are shown in a perspective view.

[0035] Figure 1 The opening and closing device 1 shown has a geared motor 3, in which a connecting shaft 51 of an output wheel 5 protruding from a housing 4 is connected to an opening and closing member 2. Therefore, when the output wheel 5 rotates around an axis L5 (rotation center axis), the opening and closing member 2 rotates around the axis L5 in an opening direction and a closing direction. The opening and closing member 2 is, for example, a toilet seat, a toilet lid, etc. of a Western-style toilet, and in this case, the geared motor 3 is configured so that the axis L5 of the output wheel 5 is horizontal.

[0036] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the gear transmission motor 3 has a housing 4 of a substantially rectangular parallelepiped shape, and the housing 4 has a first housing member 10, a second housing member 20, and a third housing member 30 which are sequentially overlapped and arranged from one side Z1 to the other side Z2 in the Z direction. The first housing member 10, the second housing member 20, and the third housing member 30 are all made of resin. The first housing member 10 has: a quadrilateral first end plate portion 11; and four first side plates 12, the four first side plates 12 being bent from the edge of the first end plate portion 11 toward the other side in the Z direction, hereinafter referred to as Figure 7 The gear transmission mechanism 40 and the like described above are accommodated inside the first housing member 10 .

[0037] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the second housing member 20 has: a second end plate portion 21, which is opposite to the first end plate portion 11 of the first housing member 10; and a second side plate portion 22, which is bent from the edge of the second end plate portion 21 toward the first housing member 10. In the second housing member 20, a portion of the second end plate portion 21, which is located on one side X1 in the X direction and one side Y1 in the Y direction and corresponds to the corner portion 4a of the housing 4, becomes a quadrilateral recess 28 recessed toward the first housing member 10, and an edge of a bottom plate portion 280 of the recess 28 is connected to an edge of the second end plate portion 21 through the second side plate portion 23. The end portion of the second side plate portion 23 on the other side Z2 in the Z direction connected to the second end plate portion 21 extends from the edge of the second end plate portion 21 to form a step portion 230.

[0038] When the second housing member 20 constructed as described above is covered on the first housing member 10 from the other side Z2 in the Z direction, the edge of the bottom plate portion 280 and the second side plate portions 22, 23 of the second housing member 20 will abut against the first side plate portion 12 of the first housing member 10. In this state, the first housing member 10 and the second housing member 20 are fixed by screws (not shown) or the like.

[0039] In the second housing member 20, the bottom plate portion 280 is formed with a step portion 283, and the step portion 283 extends along the Y direction at a midway position in the X direction of the bottom plate portion 280. On the bottom plate portion 280, the first bottom plate portion 281 is located at a position closer to the first housing member 10 side (one side in the Z direction) than the second bottom plate portion 282, and the first bottom plate portion 281 is located at a position closer to the one side X1 in the X direction than the step portion 283, and the second bottom plate portion 282 is located at a position closer to the other side X2 in the X direction than the step portion 283. Corresponding to the above shape, the second side plate portion 12 of the first housing member 10 is formed with a step portion 120.

[0040] In the bottom plate portion 280, an opening portion 24 is formed in a portion where the end portion of the step portion 283 on the other side Y2 in the Y direction is located so as to span the first bottom plate portion 281 and the second bottom plate portion 282, and in the second side plate portion 23, notches 241 and 242 are formed in a portion connected to the opening portion 24. In addition, the bottom plate portion 280 is formed with a plate-like partition wall 285, which extends in the Y direction along the step portion 283, and the first bottom plate portion 281 and the second bottom plate portion 282 are separated by the partition wall 285. The partition wall 285 extends to the other side Y2 in the Y direction until it reaches the edge of the opening portion 24. A substantially triangular support plate portion 25 is formed so as to cover a portion of the opening portion 24 from the other side Z2 in the Z direction, and the support plate portion 25 protrudes from the end portion of the second side plate portion 23 on the other side Z2 in the Z direction toward the one side Y1 in the Y direction.

[0041] The third housing member 30 includes: a third end plate portion 31, which covers the recessed portion 28 of the second housing member 20 from the other side Z2 in the Z direction; and a third side plate portion 32, which is bent from the edge of the third end plate portion 31 in a manner of abutting against the outer edge of the bottom plate portion 280 of the second housing member 20, and a step portion 321 is formed at the front end of the third side plate portion 32, and the step portion 321 corresponds to the step portion 283 of the bottom plate portion 280. The third housing member 30 overlaps with the second housing member 20 in a state where the edge of the third end plate portion 31 abuts against the step portion 230 of the second side plate portion 23 formed in the second housing member 20, and the second housing member 20 and the third housing member 30 are fixed by screws (not shown) or the like. In the above state, the third end plate portion 31 of the third housing member 30 overlaps with the support plate portion 25 and the partition wall 285 of the second housing member 20.

[0042] (Configuration of the Support Structure of the Output Wheel 5 and Other Structures)

[0043] Figure 6 It is schematically indicated Figure 1 FIG. 1 is an explanatory diagram of the support structure of the output wheel 5 and the fourth gear 44 of the final stage in the gear transmission motor 3 shown in FIG. Figure 6 In FIG. 4 , the actual positional relationship between the output wheel 5 and the large-diameter gear 441 of the fourth gear 44 is represented by a two-dot chain line L441.

[0044] like Figure 2 , Figure 3 and Figure 6 As shown, the output wheel 5 is arranged at the corner 4a located on one side X1 in the X direction and on one side Y1 in the Y direction in the shell 4, and the tooth portion 52 of the output wheel 5 is located in the space sandwiched by the first bottom plate portion 281 of the second shell component 20 and the third end plate portion 31 of the third shell component 30.

[0045] A cylindrical bearing portion 27 is formed on the first bottom plate portion 281 of the second housing member 20. The bearing portion 27 protrudes toward the other side Z2 in the Z direction. A circular hole 520 is formed on the large diameter portion of the output wheel 5 where the tooth portion 52 is formed. The hole 520 opens toward one side Z1 in the Z direction. Therefore, the bearing portion 27 is embedded in the hole 520 of the output wheel 5 to support the output wheel 5 so that it can rotate. In addition, a circular hole 315 is formed on the third end plate portion 31 of the third housing member 30. The hole 315 overlaps with the bearing portion 27 of the second housing member 20 on the other side Z2 in the Z direction. A cylindrical barrel portion 316 is formed from the inner edge of the hole 315 toward one side Z1 in the Z direction (see Figure 5 The connecting shaft 51 of the output wheel 5 protrudes from the hole 315 to the other side Z2 in the Z direction.

[0046] like Figure 2 and Figure 3 As shown in FIG. 1 , a sensor gear 61 is arranged in a space sandwiched between the second bottom plate portion 282 of the second housing member 20 and the third end plate portion 31 of the third housing member 30. The shaft portion 611 protruding toward one side Z1 in the Z direction of the sensor gear 61 is supported rotatably by the shaft hole 286 formed in the second bottom plate portion 282, and the shaft portion 612 protruding toward the other side Z2 in the Z direction of the sensor gear 61 is supported by the shaft hole 317 (see FIG. 1 ) formed in the third end plate portion 31 of the third housing member 30. Figure 5 ) is supported to be rotatable. The shaft portion 612 of the sensor gear 61 is connected to a rotation detector 63 mounted on a sensor substrate 62. In the present embodiment, the rotation detector 63 is a potentiometer. The sensor substrate 62 is fixed to the second side plate portion 23 of the second housing member 20.

[0047] (Structure of the gear transmission mechanism 40, etc.)

[0048] Figure 7 yes Figure 1 The gear transmission mechanism 40 and the like of the geared motor 3 are shown in a top view. Figure 8 yes Figure 7 A perspective view of the gear transmission mechanism 40 etc. shown. Fig. 9 yes Figure 7 The gear transmission mechanism 40 shown in FIG. Figure 4 and Figure 7 As shown, between the first housing member 10 and the second housing member 20 (inside the second housing member 20), a motor body 80 as a driving source and a gear transmission mechanism 40 are arranged, and the gear transmission mechanism 40 transmits the rotation of the motor body 80 to the output wheel 5. In the present embodiment, the motor body 80 is a stepping motor. The end of the motor body 810 of the motor body 80 is fixed by the fixing plate 16 on the other side X2 in the X direction of the first housing member 10 so that the motor shaft 81 faces the other side Y2 in the Y direction. A worm 85 having a spiral groove formed on the outer peripheral surface and a magnet 83 for detecting rotation are fixed to the motor shaft 81, and the front end of the worm 85 is supported by the bearing member 17 so as to be rotatable. A magnetic sensor 72 is arranged on the side of the magnet 83, and the magnetic sensor 72 is mounted on the substrate 71. In the present embodiment, the magnetic sensor 72 is a Hall element, and the substrate 71 on which the magnetic sensor 72 is mounted is arranged at two locations separated by an angle range of 90° with the motor shaft 81 as the rotation center.

[0049] like Figure 4 , Figure 7 , Figure 8 and Fig. 9As shown, the gear transmission mechanism 40 includes: a first gear 41 meshing with the worm 85; a second gear 42 meshing with the first gear 41; a third gear 43 meshing with the second gear 42; and a fourth gear 44 meshing with the third gear 43, and the fourth gear 44 is a final gear meshing with the output wheel 5.

[0050] The first gear 41 includes: a worm wheel 411, which meshes with the worm 85; and a gear member 412, which is arranged concentrically with the worm wheel 411 and is provided on one side Z1 in the Z direction relative to the worm wheel 411. The gear member 412 includes: a tooth portion 413, which has a gear formed on the outer peripheral surface; and a cylinder portion 414, which surrounds the end of the worm wheel 411, and a torque limiter (not shown) is formed between the end of the worm wheel 411 and the cylinder portion 414. Therefore, under normal circumstances, the worm wheel 411 rotates integrally with the gear member 412, but when a large load is applied to the gear member 412, the worm wheel 411 will idle relative to the gear member 412.

[0051] The second gear 42 is a composite gear including a large diameter gear 421 and a small diameter gear 422, wherein the large diameter gear 421 meshes with the gear member 412 of the first gear 41, the diameter of the small diameter gear 422 is smaller than the diameter of the large diameter gear 421, and the small diameter gear 422 is arranged on the other side Z2 in the Z direction relative to the large diameter gear 421. The third gear 43 is a composite gear including a large diameter gear 431 and a small diameter gear 432, wherein the large diameter gear 431 meshes with the small diameter gear 422 of the second gear 42, the diameter of the small diameter gear 432 is smaller than the diameter of the large diameter gear 431, and the small diameter gear 432 is arranged on one side Z1 in the Z direction relative to the large diameter gear 431. The fourth gear 44 is a composite gear including a large diameter gear 441 and a small diameter gear 442, wherein the large diameter gear 441 meshes with the small diameter gear 432 of the third gear 43, the diameter of the small diameter gear 442 is smaller than the diameter of the large diameter gear 441, and the small diameter gear 442 is arranged on the other side Z2 in the Z direction relative to the large diameter gear 441. 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 located on one side in the Z direction than the tooth portion 512 of the output wheel 5 and the tooth portion 610 of the sensor gear 61.

[0052] like Figure 7As shown, the spacing between the output wheel 5 and the side plate portion of the housing 4 (the first side plate portion 12 of the first housing member 10 and the third side plate portion 32 of the third housing member 30) is smaller than the spacing between the first gear 41, the second gear 42, the third gear 43 and the fourth gear 44 used in the gear transmission mechanism 40 and the side plate portion of the housing 4. Therefore, it is difficult to increase the speed reduction ratio from the fourth gear 44 of the final stage to the output wheel 5 by enlarging the diameter based on the tooth portion 52 of the output wheel 5.

[0053] (Configuration of the Support Structure of the Fourth Gear 44 and Other Structures)

[0054] 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 support shafts 410, 420, 430 and 440, respectively. Here, both ends of the support shafts 410, 420 and 430 supporting the first gear 41, the second gear 42 and the third gear 43 are held by the first end plate portion 11 of the first housing member 10 and the second end plate portion 21 of the second housing member 20.

[0055] In contrast, if Figure 6 As shown, one end 440a (the end on one side Z1 in the Z direction) of the support shaft 440 supporting the fourth gear 44 is held in the shaft hole 118 of the first end plate portion 11 of the first housing member 10, and the other end 440b (the end on the other side Z2 in the Z direction) is held in the overlapping portion between the support plate portion 25 of the second housing member 20 and the third end plate portion 31 of the third housing member 30. In the present embodiment, the support plate portion 25 is formed with a shaft hole 258 in the form of a through hole into which the support shaft 440 is inserted. In addition, the third end plate portion 31 of the third housing member 30 is formed with a shaft hole 318 overlapping with the shaft hole 258, and the other end 440b of the support shaft 440 is held by inserting into the two shaft holes 258, 318. Therefore, the two shaft holes 258, 318 are integrated in the overlapping portion between the support plate portion 25 of the second housing member 20 and the third end plate portion 31 of the third housing member 30, and hold the other end 440b of the support shaft 440. The shaft hole 318 is a bottomed concave portion opened to one side Z1 in the Z direction and closed at the other side Z2 in the Z direction. The shaft hole 118 is a bottomed concave portion opened to the other side Z2 in the Z direction and closed at one side Z1 in the Z direction.

[0056] In the present embodiment, one end 440a (the end on one side Z1 in the Z direction) of the support shaft 440 supporting the fourth gear 44 is pressed into the shaft hole 118 of the first end plate portion 11 of the first housing member 10. In addition, the other end 440b (the end on the other side Z2 in the Z direction) of the support shaft 440 is pressed into the shaft hole 318 of the third end plate portion 31 of the third housing member 30. Therefore, the support shaft 440 is fixed to the first housing member 10 and the third housing member 30 by being pressed into the shaft hole 118 and the shaft hole 318. In contrast, the second housing member 20 supports the outer peripheral surface of the support shaft 440 in the direction orthogonal to the Z direction (the rotation direction of the fourth gear 44) through the inner peripheral surface of the shaft hole 258 formed as a through hole. The support shaft 440 is inserted into the shaft hole 258 in such a manner that a portion of the outer peripheral surface of the support shaft 440 is in contact with a portion of the inner peripheral surface of the shaft hole 258. Alternatively, the support shaft 440 may be press-fitted into the shaft hole 250 .

[0057] 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. Figure 6 As shown by the two-dot chain line L441 in the middle, when viewed from the Z direction, the bearing portion 27 supporting the output wheel 5 overlaps with the large diameter gear 441 of the fourth gear 44. Even in this case, in the present embodiment, the fourth gear 44 is arranged between the first housing member 10 and the second housing member 20, and on the other hand, the output wheel 5 is arranged between the second housing member 20 and the third housing member 30. In addition, when the fourth gear 44 is arranged inside the opening portion 24 of the second housing member 20, the large diameter gear 441 of the fourth gear 44 is located between the first end plate portion 11 of the first housing member 10 and the bottom plate portion 280 of the second housing member 20. In addition, a part of the small diameter gear 442 of the fourth gear 44 is located in the space sandwiched between the first bottom plate portion 281 and the third end plate portion 31 of the third housing member 30 through the notch 242. Therefore, the small diameter gear 442 of the fourth gear 44 can be meshed with the tooth portion 52 of the output wheel 5.

[0058] In addition, since a portion of the small diameter gear 442 of the fourth gear 44 is located in the space sandwiched between the second bottom plate portion 282 and the third end plate portion 31 of the third housing member 30 through the notch 241, the small diameter gear 442 of the fourth gear 44 can mesh with the tooth portion 610 of the sensor gear 61.

[0059] (action)

[0060] In the gear transmission motor 3 and the opening and closing device 1 constructed as described above, when the motor body 80 is powered to rotate the motor shaft 81, the rotation is decelerated through the gear transmission mechanism 40 and transmitted to the output wheel 5, so that the opening and closing member 2 rotates in the opening direction and the closing direction. At this time, the rotation detector 63 detects the rotation of the fourth gear 44 and detects the rotation position of the output wheel 5.

[0061] (Main Effects of the Present Embodiment)

[0062] As described above, in the gear transmission motor 3 and the opening and closing device 1 of the present embodiment, one end 440a of the support shaft 440 that supports the fourth gear 44 of the final stage to be rotatable is held in the first housing member 10, and the other end 440b is held in the shaft hole 258 of the second housing member 20 and the shaft hole 318 of the third housing member 30 at the portion where the support plate portion 25 of the second housing member 20 overlaps with the third end plate portion 31 of the third housing member 30. Therefore, the first housing member 10, the second housing member 20, and the third housing member 30 are positioned with high precision by the support shaft 440. Therefore, the plurality of gears of the gear transmission mechanism 40 are appropriately positioned with reference to the support shaft 440 that supports the fourth gear 44, so that the gears are appropriately meshed with each other. In addition, since the other end 440b of the support shaft 440 is retained in the second shell member 20 and the third shell member 30 at the overlapping portion of the second shell member 20 and the third shell member 30, the support plate portion 25 of the second shell member 20 and the third end plate portion 31 of the third shell member 30 can be strengthened in the portion where the other end 440b of the support shaft 440 is retained.

[0063] In addition, one end 440a of the support shaft 440 is held in the shaft hole 118 of the first housing member 10, and the other end 440b is held in the shaft hole 258 of the second housing member 20 and the shaft hole 318 of the third housing member 30. More specifically, one end 440a of the support shaft 440 is fixed by being pressed into the shaft hole 118 of the first housing member 10, and the other end 440b is fixed by being pressed into the shaft hole 318 of the third housing member 30. Therefore, the support shaft 440 can be reliably held relative to the first housing member 10 and the third housing member 30, and the first housing member 10, the second housing member 20, and the third housing member 30 are positioned with higher precision by the support shaft 440.

[0064] In particular, in the present embodiment, since the notch 241 is formed in the second housing member 20, the support plate portion 25 is not fully supported, but even in this case, the support plate portion 25 is reinforced by the third end plate portion 31 of the third housing member 30. Therefore, even when a large force is applied to the support shaft 440, the support plate portion 25 can withstand the force.

[0065] In addition, the fourth gear 44 of the final stage is arranged between the first housing member 10 and the second housing member 20, and the output wheel 5 is supported rotatably by the bearing portion 27 formed in the second housing member 20 between the second housing member 20 and the third housing member 30. Therefore, the following structure can be adopted: in the fourth gear 44 of the final stage, the large-diameter gear 441 meshing with the third gear 43 of the previous stage is arranged between the first housing member 10 and the second housing member 20 at a position overlapping with the bearing portion 27 supporting the output wheel 5 in the Z direction. Therefore, even when the large-diameter gear 441 of the fourth gear 44 is enlarged, the output wheel 5 and the fourth gear 44 of the final stage can be supported rotatably. In addition, since the large-diameter gear 441 of the fourth gear 44 can be enlarged, the reduction ratio from the third gear 43 to the fourth gear 44 can be increased. Therefore, since it is not necessary to excessively enlarge the diameter of the tooth portion 52 of the output wheel 5, the output wheel 5 can be easily arranged at the corner 4a of the housing 4.

[0066] Furthermore, since a partition wall 285 is provided between the sensor gear 61 meshing with the fourth gear 44 of the final stage and the output wheel 5, even when a lubricant such as grease is applied to the tooth portion 52 of the output wheel 5, the lubricant is not easily attached to the sensor gear 61. Furthermore, since the support plate portion 25 of the second housing member 20 supporting the fourth gear 44 of the final stage is connected to the partition wall 285, the support plate portion 25 can be reinforced by the partition wall 285.

[0067] (Other Embodiments)

[0068] In the above embodiment, one end 440a of the support shaft 440 is held at the first housing member 10, and the other end 440b is held at the shaft hole 258 formed by the through hole of the second housing member 20 and the shaft hole 318 of the third housing member 30 at the portion where the support plate portion 25 of the second housing member 20 overlaps with the third end plate portion 31 of the third housing member 30. However, the following structure may be adopted: in other support shafts 410, 420, 430, one end is held at the first housing member 10, and the other end is held at the second housing member 20 and the third housing member 30 at the portion where the second housing member 20 overlaps with the third housing member 30.

Claims

1. A gear transmission motor, characterized in that: include: case; a motor body, the motor body being held by the housing; a gear transmission mechanism including a plurality of gears, the plurality of gears being rotatably supported by the housing and transmitting rotation output from the motor body inside the housing; as well as an output wheel, the output wheel meshing with a final gear among the plurality of gears, The housing comprises a first housing member, a second housing member and a third housing member which are sequentially arranged along the rotation center axis direction of the output wheel. One end of a support shaft that rotatably supports a gear included in the gear transmission mechanism is held on the first housing member, and the other end is held on the second housing member and the third housing member at a portion where the second housing member and the third housing member overlap, The support plate portion of the second housing member abuts against the third end plate portion of the third housing member in the axial direction of the support shaft, and the support shaft is retained by an axial hole formed by the through hole of the second housing member and the axial hole of the third housing member at the abutting and overlapping portion.

2. The geared motor according to claim 1, characterized in that: The support shaft rotatably supports the final gear.

3. The geared motor according to claim 2, characterized in that: The output wheel is rotatably supported by a bearing portion formed in the second housing member in a state where a tooth portion meshing with the final gear is arranged between the second housing member and the third housing member.

4. The geared motor according to claim 3, characterized in that: The tooth portion of the final stage gear that meshes with the gear of the previous stage is arranged between the first housing member and the second housing member at a position overlapping with the bearing portion in the direction of the rotation center axis.

5. The geared motor according to any one of claims 2 to 4, characterized in that: A sensor gear is provided, wherein the sensor gear is meshed with the final gear, The second housing member includes a partition wall that separates the output wheel from the sensor gear.

6. The geared motor according to claim 5, characterized in that: In the second housing member, a portion supporting the support shaft is connected to the partition wall.

7. The geared motor according to claim 1, characterized in that: The one end of the support shaft is held in the shaft hole of the first housing member, and the other end is held in the shaft hole of the second housing member and the shaft hole of the third housing member.

8. The geared motor according to claim 7, characterized in that: The one end of the support shaft is fixed by being pressed into the shaft hole of the first housing member, The other end is fixed by being pressed into the shaft hole of the third housing member.

9. The geared motor according to claim 8, characterized in that: The axial hole of the second housing member is a through hole, At least a portion of the outer peripheral surface of the support shaft is in contact with the inner peripheral surface of the shaft hole of the second housing member.

10. The geared motor according to claim 1, wherein: A distance between the output wheel and the side plate portion of the housing is smaller than a distance between the plurality of gears and the side plate portion of the housing.

11. The geared motor according to claim 10, characterized in that: The output wheel is arranged at a corner portion of the housing sandwiched between two adjacent side plate portions extending in directions intersecting each other.

12. An opening and closing device, A geared motor according to any one of claims 1 to 11, It is characterized in that The output wheel is connected with the opening and closing member.

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