JP2014194248A - Lid driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid driving device capable of attaining a large torque while a small-type motor is being applied as a driving source and that is not locked even in the case that a rotating force is inputted from a lid side.SOLUTION: A toilet seat switchgear 6 (a lid driving device) is constructed such that a paradox planetary gear mechanism 50 for transmitting a rotation of motor 16 to an output shaft 11 comprises the first internal gear 53 integral with the output shaft 11; the second internal gear 54; the first planetary gear 55 engaged with the first internal gear 53; the second planetary gear 56 engaged with the second internal gear 54; a planetary carrier 58 holding the first planetary gear 55 and the second planetary gear 56 around a supporting shaft 57; and a pinion 52 engaged with the second planetary gear 56. The pinion 52 is an input element. The first distance d1 ranging from the first contact part t1 between the first planetary gear 55 and the first internal gear 53 to an axis line L2 of the supporting shaft 57 is different from the second distance d2 ranging from the second contact part t2 between the second planetary gear 56 and the second internal gear 54 and the second distance d2 is always larger than the first distance d1.

Description

  The present invention relates to a lid driving device for opening and closing a lid such as a toilet seat of a Western-style toilet.

  Since the lid driving device for opening and closing the toilet seat of the western toilet bowl rotates the toilet seat around the rotation center axis set at the rear end of the toilet seat, a large torque is required. On the other hand, in order to suppress the power consumption of the Western-style toilet, it is required to mount a small motor as a drive source.

  Patent Document 1 describes a geared motor that can obtain a large torque while using a small motor as a drive source. The geared motor of this document has a planetary gear mechanism that decelerates the rotation of the motor to a driving force transmission mechanism that transmits the rotation of the motor to the output shaft. The planetary gear mechanism includes a first internal gear and a second internal gear arranged coaxially with the output shaft and spaced apart in the axial direction, and a planetary gear meshing with the first internal gear and the second internal gear. And a planetary carrier having a support shaft for holding the planetary gear in a rotatable manner. The first internal gear is an output element integrated with the output shaft, the planet carrier is an input element, and the second internal gear is a fixed element. In this document, a mysterious planetary gear mechanism having a large reduction ratio is adopted as the planetary gear mechanism, so that a large torque can be obtained.

JP 2008-45740 A

  If the geared motor of Patent Document 1 is used as a lid driving device for opening and closing the toilet seat, the toilet seat can be automatically opened and closed if the power consumption of the Western-style toilet is suppressed.

  However, a lid such as a toilet seat may be manually opened and closed by a user of a western toilet. Therefore, when the geared motor of Patent Document 1 is used as the lid driving device, it is necessary to consider the case where a rotational force (torque) is input from the output shaft side.

  Here, when a rotational force is input from the output shaft side to the geared motor of Patent Document 1, the geared motor may mechanically fall into a locked state and may not move.

  In view of such a problem, the object of the present invention is to provide a lid drive that can obtain a large torque while using a small motor as a drive source and does not lock even when a rotational force is input from the lid side. To provide an apparatus.

  In order to solve the above problems, the present invention includes a motor, an output shaft, and a driving force transmission mechanism that transmits the rotation of the motor to the output shaft, and the driving force transmission mechanism decelerates the rotation of the motor. In a lid driving apparatus that includes a mysterious planetary gear mechanism and opens and closes a lid connected to the output shaft by driving the motor, the mysterious planetary gear mechanism is coaxial with the output shaft and spaced apart in the axial direction. The first internal gear and the second internal gear arranged, the first planetary gear meshing with the first internal gear, and the first planetary gear arranged coaxially with the first planetary gear and meshing with the second internal gear. A second planetary gear, a planet carrier that holds the first planetary gear and the second planetary gear so as to rotate about a support shaft, and a sun gear that meshes with the second planetary gear, , Input element, before The first internal gear is an output element, the second internal gear is a fixed element, the first planetary gear and the second planetary gear are integral, the first planetary gear and the first planetary gear The first distance from the first contact portion t1 that is in meshing contact with the internal gear to the axis of the support shaft, and the second planetary gear and the second internal gear are in meshing contact with each other. This is different from the second distance from the second contact portion t2 to the axis of the support shaft, and the magnitude relationship between the first distance and the second distance does not change.

  According to the present invention, since the driving force transmission mechanism has the mysterious planetary gear mechanism having a large reduction ratio, high torque can be obtained even when a small motor is used as the driving source. In addition, the first internal gear and the second internal gear are respectively engaged with separate planetary gears, and the first planetary gear and the first internal gear are in meshing contact with each other. The magnitude relationship between the first distance to the axis of the support shaft and the second distance from the second contact portion t2 where the second planetary gear and the second internal gear mesh and are in contact with each other to the axis of the support shaft, Even when a rotational force is input from the output shaft side, the same state is maintained without reverse rotation. Therefore, even when the lid is manually rotated, the planetary gear mechanism can be prevented from being locked.

  In the present invention, in order not to change the magnitude relationship between the first distance and the second distance, the first planetary gear and the second planetary gear have different pitch circle diameters, and the pitch circle diameter is small. It is desirable that the tooth tip of one planetary gear is located radially outside the tooth bottom of the other planetary gear. By doing this, the pitch circle diameter of the first internal gear and the pitch circle diameter of the second internal gear are close to each other, and the difference between the number of teeth of the first internal gear and the number of teeth of the second internal gear is calculated. Since it becomes easy to make it small, the reduction ratio of the mysterious planetary gear mechanism can be increased. Moreover, since the area of the junction part of a 1st planetary gear and a 2nd planetary gear can be ensured, the intensity | strength of these junction parts can be improved.

  In the present invention, it is preferable that the first planetary gear and the second planetary gear have the same number of teeth. That is, in order not to change the magnitude relationship between the first distance and the second distance, the pitch circle diameter may be made different by changing the number of teeth with the same module between the first planetary gear and the second planetary gear. However, if the number of teeth is the same and the pitch circle diameters are different, it is not necessary to align the positions of the teeth when constructing the planetary gear mechanism, so that the planetary gear mechanism can be easily assembled.

  In this invention, it has a flame | frame which mounts the said driving force transmission mechanism, Between the holding | maintenance part holding the said 2nd internal gear in the said frame, and the said 2nd internal gear, more than preset torque It is desirable that a torque limiter that slides the second internal gear with respect to the holding portion when the torque is applied to the second internal gear is desirable. In this way, damage to the driving force transmission mechanism can be suppressed or avoided when excessive rotational force is input from the output shaft side. That is, excessive torque is input to the driving force transmission mechanism from the output shaft side by manually rotating the lid at high speed or manually rotating the lid in the direction opposite to the driving direction by the lid driving device. In addition, both the torque and the cogging torque of the motor may act on the driving force transmission mechanism and damage the driving force transmission mechanism. On the other hand, if a torque limiter is provided, when an excessive torque is input from the output shaft side, this torque is positioned upstream of the torque limiter in the driving force transmission direction from the motor to the output shaft. It is possible to prevent transmission to the mechanism portion of the driving force transmission mechanism. Therefore, damage to the driving force transmission mechanism can be suppressed or avoided.

  In the present invention, the first internal gear is preferably integral with the output shaft. With this configuration, the planetary gear mechanism is disposed at the downstream end in the driving force transmission direction from the motor toward the output shaft. Here, if a planetary gear mechanism comprising a mysterious planetary gear mechanism with a high reduction ratio is arranged at the downstream end in the driving force transmission direction of the driving force transmission mechanism, it is applied to the mechanism portion located upstream of the planetary gear mechanism. The load (torque) can be reduced. Therefore, the mechanism portion positioned upstream of the planetary gear mechanism can be made of a material having low strength such as resin, so that the manufacturing cost of the device can be suppressed.

  In the present invention, it is preferable that the first internal gear, the first planetary gear, the second planetary gear, the support shaft, and the second internal gear are made of metal. In this way, when an excessive rotational force is input from the output shaft side, the mechanism portion of the driving force transmission mechanism located downstream of the torque limiter in the driving force transmission direction from the motor toward the output shaft. Damage can be avoided.

  In the present invention, the holding portion protrudes in the axial direction, is inserted into the inner peripheral side of the second internal gear, holds the second internal gear from the inner peripheral side, and the torque limiter is It is desirable that the holding portion is configured between an outer peripheral surface portion facing the second internal gear and the second internal gear. If it does in this way, the mechanism and tolerance ring which used the ratchet as a torque limiter can be used.

  In the present invention, it is preferable that the torque limiter is a tolerance ring, and the tolerance ring is attached to the outer peripheral surface portion of the holding portion. If it does in this way, a 2nd internal gear can be hold | maintained to a flame | frame by press-fitting the holding | maintenance part in the state with which the tolerance ring was mounted | worn to the inner peripheral side of a 2nd internal gear. Accordingly, the lid drive device can be easily assembled. In addition, since the holding portion holds the second internal gear via the tolerance ring, the inclination of the second internal gear can be prevented. As a result, the tolerance ring can be deformed in a radial direction with a good balance, and variation in slipping torque can be reduced.

  In the present invention, the driving force transmission mechanism includes a reduction mechanism disposed adjacent to the upstream side of the planetary gear mechanism in a driving force transmission direction from the motor toward the output shaft, and the holding portion is cylindrical. It is desirable that a connecting member for connecting the output element of the speed reduction mechanism and the sun gear so as to be integrally rotatable penetrates the inner peripheral side of the holding portion. In this way, even when the second internal gear is held from the inner peripheral side by the holding portion, the driving force of the reduction gear can be transmitted to the sun gear.

  In the present invention, each of the first planetary gear and the second planetary gear includes three or more first planetary gears and second planetary gears, and each includes three or more first planetary gears and the second planetary gears. The two planetary gears are preferably arranged at equiangular intervals around the axis of the output shaft. In this way, it becomes easy to maintain the second internal gear, the planet carrier, and the first internal gear as a coaxial body.

  According to the present invention, high torque can be obtained even when a small motor is used as a drive source. Further, when the lid is manually rotated, the planetary gear mechanism can be prevented from being locked.

(A) is a perspective view of a Western-style toilet bowl which mounts the toilet seat opening / closing apparatus which is embodiment of this invention, (b) is a perspective view of a toilet seat opening / closing apparatus. It is a longitudinal cross-sectional view of a toilet seat opening / closing apparatus. It is an exploded perspective view of a toilet seat opening and closing device. It is a perspective view of a frame. It is the disassembled perspective view which looked at the mysterious planetary gear mechanism from the upper part. It is the disassembled perspective view which looked at the mysterious planetary gear mechanism from the lower part. It is explanatory drawing of the meshing state of a 1st internal gear and a 1st planetary gear, and the meshing state of a 2nd internal gear and a 2nd planetary gear.

  Hereinafter, a toilet seat opening and closing device according to an embodiment of the lid driving device of the present invention will be described with reference to the drawings.

(overall structure)
FIG. 1A is a perspective view of a Western-style toilet equipped with a toilet seat opening and closing device according to an embodiment of the lid driving device of the present invention, and FIG. 1B is mounted on the Western-style toilet shown in FIG. FIG. As shown in FIG. 1A, the western toilet 1 includes a toilet body 2, a toilet lid 3, and a toilet seat unit 4. The toilet seat unit 4 includes a toilet seat 5, a toilet seat opening / closing device (lid body driving device) 6, and a main body cover 7. The toilet seat opening / closing device 6 is housed inside the body cover 7.

  As shown in FIG. 1B, the toilet seat opening / closing device 6 includes an output shaft 11 protruding from the end surface of the case 10. The output shaft 11 is coaxially connected to a rotation center shaft 8 provided at an end portion of the toilet seat 5 on the rear side of the toilet bowl. When the toilet seat opening / closing device 6 is driven, the toilet seat 5 rotates around a rotation center axis 8 within a predetermined angular range, and a closed position 5A that is flattened on the toilet body 2 and an open position 5B that stands up with respect to the toilet body 2. Displace between. The open position 5 </ b> B is a position indicated by a two-dot chain line in FIG. 1, and the toilet seat 5 is slightly inclined rearward toward the upper side. The case 10 includes a first case 12 from which the output shaft 11 protrudes, and a second case 13 stacked on the first case 12 from the axial direction of the output shaft 11. The first case 12 and the second case 13 are resin molded products.

(Internal structure)
FIG. 2 is a longitudinal sectional view of the toilet seat opening / closing device 6. FIG. 3 is an exploded perspective view of the toilet seat opening / closing device 6 with the case 10 removed. 4A is a perspective view of the frame as viewed from above, and FIG. 4B is a perspective view of the frame as viewed from below. In the following description, the direction of the axis L of the output shaft 11 is the vertical direction, and according to the vertical direction of FIG. 2, the protruding side of the output shaft 11 is upward and the opposite side of the output shaft 11 is downward. The opening / closing device 6 will be described.

  As shown in FIGS. 2 and 3, the toilet seat opening / closing device 6 includes a frame 15, a motor 16 serving as a drive source for the toilet seat opening / closing device 6, and a drive for transmitting the rotation of the motor 16 to the output shaft 11. A force transmission mechanism 17 and an angular position detection mechanism 18 (see FIG. 3) for detecting the rotational angular position of the output shaft 11 are provided. In addition, the toilet seat opening / closing device 6 includes a metal fixing shaft 19 whose lower end is press-fitted and fixed in a recess 13 b formed inside the bottom surface 13 a of the second case 13. The fixed shaft 19 is located on the axis L of the output shaft 11 and extends in parallel with the rotation center axis L1 of the motor 16. The driving force transmission mechanism 17 includes a first planetary gear mechanism 30, a second planetary gear mechanism 40, and a strange planetary gear mechanism 50 from the upstream side to the downstream side in the driving force transmission direction from the motor 16 toward the output shaft 11. ing.

(flame)
As shown in FIG. 4A, the frame 15 includes a motor mounting surface 20 on the upper surface side of one side portion in the longitudinal direction. A through hole 21 for allowing the rotation output shaft 25 of the motor 16 to pass through is formed in the motor mounting surface 20. As shown in FIG. 4B, an internal gear 31 of the first planetary gear mechanism 30 is formed coaxially with the through hole 21 on the lower surface side of one side portion in the longitudinal direction of the frame 15.

  As shown in FIG. 4A, a holding portion 22 for holding the mysterious planetary gear mechanism 50 is formed on the upper surface side of the other side portion in the longitudinal direction of the frame 15. The holding part 22 has a cylindrical shape and protrudes upward. The holding part 22 includes an inner cylinder part 23 made of resin and an outer cylinder part 24 attached to the outer peripheral side of the inner cylinder part 23. The inner cylinder part 23 is a part of the resin frame 15, and the outer cylinder part 24 is made of metal. The outer cylinder portion 24 is integrated with the frame 15 by insert molding. As shown in FIG. 4B, an internal gear 41 of the second planetary gear mechanism 40 is formed coaxially with the holding portion 22 on the lower surface side of the other side portion in the longitudinal direction of the frame 15.

(motor)
The motor 16 is a DC motor. As shown in FIG. 2, the motor 16 is mounted and fixed on the motor mounting surface 20 with the rotation output shaft 25 facing downward. More specifically, the motor 16 is fixed to the frame 15 with the output side end face 26 from which the rotation output shaft 25 protrudes in the motor 16 main body being in contact with the motor mounting surface 20. The output side end face 27 faces upward. A rotation output shaft 25 of the motor 16 passes through the through hole 21 and projects to the lower surface side of the frame 15. A pair of terminals 28 protrude upward from the non-output side end face 27. The pair of terminals 28 are electrically connected to an external control device via lead wires (not shown).

(First planetary gear mechanism)
As shown in FIG. 2, the first planetary gear mechanism 30 includes a pinion 32 (sun gear) attached to the rotation output shaft 25 of the motor 16, three planetary gears 33 that mesh with the pinion 32, and each planetary gear 33. And a planet carrier 35 that holds each planetary gear 33 so as to be capable of rotating about a support shaft 34. The pinion 32, the three planetary gears 33 and the planet carrier 35 are all resin molded products.

  The pinion 32 is an input element of the first planetary gear mechanism 30. The three planetary gears 33 are arranged at equiangular intervals around the axis L1 of the rotation output shaft 25. The internal gear 31 is formed on the frame 15 and is a fixing element of the first planetary gear mechanism 30. The planet carrier 35 is an output element of the first planetary gear mechanism 30 and includes a spur gear 36 in the lower portion thereof. The planet carrier 35 has a through hole 37 at the center, and a support protrusion 13 c protruding upward from the bottom surface 13 a of the frame 15 is inserted into the through hole 37 so as to be rotatably supported by the support protrusion 13 c. In this example, the first planetary gear mechanism 30 is a reduction mechanism, and the reduction ratio is 1: 4.5.

(Second planetary gear mechanism)
As shown in FIG. 2, the second planetary gear mechanism 40 is provided with a large-diameter gear portion 42a that meshes with the spur gear 36 of the planet carrier 35, and a smaller diameter than the large-diameter gear portion 42a and coaxial with the large-diameter gear portion 42a. A compound gear 42 having a small-diameter gear portion 42b (sun gear), three planetary gears 43 meshing with the small-diameter gear portion 42b, an internal gear 41 meshing with each planetary gear 43, and the planetary gear 43 as a support shaft. A planetary carrier 45 is provided that is rotatably held around 44. The compound gear 42, the three planetary gears 43, and the planet carrier 45 are all resin molded products.

  The compound gear 42 has a through hole 46 at the center. The compound gear 42 is rotatably supported by the fixed shaft 19 by inserting the fixed shaft 19 into the through hole 46. The small gear portion 42 b of the compound gear 42 is an input element of the second planetary gear mechanism 40. The three planetary gears 43 are arranged at equiangular intervals around the axis L of the fixed shaft 19. The internal gear 41 is formed on the frame 15 and is a fixing element of the second planetary gear mechanism 40. The planet carrier 45 is an output element of the second planetary gear mechanism 40, and includes a cylindrical protrusion 47 (connecting member) extending upward with a constant outer diameter. The planet carrier 45 is rotatably supported by the fixed shaft 19 by inserting the fixed shaft 19 into the center hole 47 a of the protrusion 47. In this example, the second planetary gear mechanism 40 is a reduction mechanism, and the reduction ratio is 1: 4.5.

  Here, a pinion 52, which is a resin molded product, is fixed to the tip of the protruding portion 47 so as to be able to rotate integrally with the planet carrier 45. The protruding portion 47 is located on the inner peripheral side of the holding portion 22 of the frame 15, and the pinion 52 protrudes upward from the upper end of the holding portion 22. The pinion 52 may be made of metal.

(Wonder planetary gear mechanism)
5 and 6 are exploded perspective views of the mysterious planetary gear mechanism 50. FIG. In FIG. 5, the motor 16 and the driving force transmission mechanism 17 are viewed from above, and in FIG. 6, the motor 16 and the driving force transmission mechanism 17 are viewed from below. FIG. 7 is a plan view of the first internal gear 53, the second internal gear 54, the first planetary gear 55, and the second planetary gear 56. As shown in FIGS. 2, 5, and 6, the mysterious planetary gear mechanism 50 includes a pinion 52 fixed to the tip of the projecting portion 47, a first internal gear 53 arranged coaxially with the output shaft 11, and a first gear 53. Two internal gears 54, three first planetary gears 55 that mesh with the first internal gear 53, and three second planetary gears 56 that mesh with the second internal gear 54, and the first coaxially arranged A planet carrier 58 that holds the planetary gear 55 and the second planetary gear 56 around the support shaft 57 is provided.

  The first internal gear 53 is located above the second internal gear 54. The three first planetary gears 55 are positioned above the three second planetary gears 56, and those arranged coaxially are supported on the three support shafts 57 so as to be capable of rotating. Here, the mysterious planetary gear mechanism 50 has a large reduction ratio with respect to the first planetary gear mechanism 30 and the second planetary gear mechanism 40, and in this example, the reduction ratio is 1:40.

  As shown in FIGS. 2 and 6, the first internal gear 53 includes a cylindrical portion 60 having a tooth portion 60 a formed on the inner side thereof, and a blocking portion 61 that blocks the upper end of the cylindrical portion 60. The blocking portion 61 is provided with an output shaft 11 protruding upward. That is, the first internal gear 53 and the output shaft 11 are integrally formed as the output member 62. A concave portion 61 a that is recessed upward is provided at the center of the lower surface of the blocking portion 61. The upper end portion of the fixed shaft 19 is inserted into the recess 61 a, and the output member 62 (the output shaft 11 and the first internal gear 53) is rotatably supported by the fixed shaft 19. The output member 62 is made of sintered metal.

  The second internal gear 54 is made of sintered metal and has a cylindrical shape. As shown in FIG. 2, the second internal gear 54 is arranged with a slight gap with respect to the first internal gear 53 in the axis L direction. Moreover, as shown in FIG. 5, in the 2nd internal gear 54, the internal tooth 54a is provided in the upper end side part of the internal peripheral surface. A lower portion of the inner peripheral surface is an annular held surface 54b held by the holding portion 22 of the frame 15.

  Here, the number of teeth of the first internal gear 53 is larger than the number of teeth of the second internal gear 54. Further, as shown in FIG. 7, the pitch circle diameter P <b> 2 of the second internal gear 54 is larger than the pitch circle diameter P <b> 1 of the first internal gear 53. In this example, the gear ratio of the first internal gear 53 and the second internal gear 54 is 0.975.

  The three first planetary gears 55 and the three second planetary gears 56 are made of sintered metal, and the first planetary gear 55 and the second planetary gear 56 arranged coaxially are integrally formed so as to be in contact with the axis L direction. ing. Here, as shown in FIG. 7, the number of teeth of the first planetary gear 55 and the number of teeth of the second planetary gear 56 are the same, but the module of the first planetary gear 55 and the module of the second planetary gear 56 are different. doing. The pitch circle diameter Q1 of the first planetary gear 55 is different from the pitch circle diameter Q2 of the second planetary gear 56. The pitch circle diameter Q2 of the second planetary gear 56 is different from the pitch circle diameter of the first planetary gear 55. Greater than Q1. Further, the tooth tip of the first planetary gear 55 is located on the outer side in the radial direction from the tooth bottom of the second planetary gear 56.

  In addition, the first distance d1 from the first contact portion t1 where the first planetary gear 55 and the first internal gear 53 are in meshing contact with each other and the axis L2 of the support shaft 57, the second planetary gear 56 and the second The second distance d2 from the second contact portion t2 in meshing contact with the internal gear 54 to the axis L2 of the support shaft 57 is greater in the second distance d2 than in the first distance d1. Never change. That is, the first planetary gear 55 and the first internal gear 53 are used when the rotation of the motor 16 is transmitted toward the output shaft 11 and when the rotation is input from the output shaft 11. Even when the meshing state of the second planetary gear 56 and the second internal gear 54 changes, the magnitude relationship that the second distance d2 is larger than the first distance d1 is maintained.

  The planet carrier 58 includes a plate 73 that holds the lower ends of the three spindles 57 and a cover 74 that holds the upper ends of the three spindles 57. The three first planetary gears 55 and the three second planetary gears 56 are held between the plate 73 and the cover 74. The support shaft 57, the plate 73, and the cover 74 are made of metal.

  Through holes 73a and 74a penetrating in the direction of the axis L are formed coaxially in the central portion of the plate 73 and the central portion of the cover 74 (see FIGS. 5 and 6). The planetary carrier 58 is rotatably supported by the fixed shaft 19 by inserting the fixed shaft 19 into the through holes 73a and 74a. Further, the plate 73 and the cover 74 hold the three support shafts 57 at equal angular intervals around the through holes 73a and 74a. Accordingly, the three first planetary gears 55 and the second planetary gears 56 are arranged at equiangular intervals around the axis L of the output shaft 11. The cover 74 has openings 74b at three locations in the circumferential direction. From each opening 74b, a part of the first planetary gear 55 and the second planetary gear 56 is exposed to the outside.

  Here, a tolerance ring 76 (torque limiter) is disposed between the held surface 54 b of the second internal gear 54 and the holding portion 22 of the frame 15. The tolerance ring 76 is a metal spring member, and includes an arc-shaped ring portion 77 and a plurality of protrusions 78 protruding outward in the radial direction from the ring portion 77. When the torque acting on the second internal gear 54 is smaller than a preset set torque, the tolerance ring 76 does not allow relative rotation between the holding portion 22 and the second internal gear 54 due to frictional force. On the other hand, the tolerance ring 76 allows relative rotation between the holding portion 22 and the second internal gear 54 when the torque acting on the second internal gear 54 becomes larger than the set torque. That is, the second internal gear 54 is caused to slip with respect to the holding portion 22.

  When the tolerance ring 76 is disposed between the holding portion 22 and the second internal gear 54, first, the tolerance ring 76 is attached to the outer peripheral annular surface of the outer cylindrical portion 24 of the holding portion 22 of the frame 15. Thereafter, the second internal gear 54 is press-fitted from above into the holding portion 22 to which the tolerance ring 76 is attached. Here, since the holding portion 22 is a portion protruding upward, the operation of attaching the tolerance ring 76 to the holding portion 22 is easy. Further, since the holding portion 22 protrudes upward, the tolerance ring 76 is exposed when the tolerance ring 76 is mounted, and the work of press-fitting the second internal gear 54 into the holding portion 22 is easy. It is.

(Angle position detection mechanism)
As shown in FIG. 3, the angular position detection mechanism 18 includes a transmission gear 80 that is coaxially attached to the output shaft 11 and rotates integrally with the output shaft 11, a potentiometer gear 81 that meshes with the transmission gear 80, and a potentiometer gear 81. A potentiometer 82 for detecting the rotational angle position of the first and second substrates 83 on which the potentiometer 82 is mounted. The substrate 83 is positioned below the non-output side end surface 27 of the main body of the motor 16 when viewed from the direction orthogonal to the axis L of the output shaft 11, and the potentiometer 82 is attached to the lower surface of the substrate 83. . A voltage is applied to the potentiometer 82 from an external control device via a lead wire (not shown), and a signal corresponding to the rotational angle position of the potentiometer gear 81 is output from the potentiometer 82, and this signal is the rotational angle of the output shaft 11. It indicates the position. A signal from the potentiometer 82 is input to an external control device via a lead wire (not shown). The potentiometer gear 81 and the potentiometer 82 are held between the first case 12 and the flange portion 13 d that spreads outward from the edge portion of the upper end opening of the second case 13.

(Toilet seat opening / closing operation)
When the toilet seat 5 is in the closed position 5A, if there is an input from the switch or sensor to the control device, the control device supplies electric power of the first polarity to the motor 16 and rotates the motor 16 in the first direction. Let Thereby, the opening operation which opens the toilet seat 5 starts.

  That is, when the motor 16 is driven, the rotation of the motor 16 is input from the pinion 32 to the first planetary gear mechanism 30 and output as the rotation of the planet carrier 35. The rotation of the planet carrier 35 of the first planetary gear mechanism 30 is transmitted to the compound gear 42 via the spur gear 36, input to the second planetary gear mechanism 40 from the small diameter gear portion 42b, and output as the rotation of the planet carrier 45. The The rotation of the planet carrier 45 is transmitted to the pinion 52 and is input from the pinion 52 to the mysterious planetary gear mechanism 50. The rotation of the pinion 52 is transmitted to the first internal gear 53 via the second planetary gear 56 and the first planetary gear 55, and is output as the rotation of the first internal gear 53, that is, the rotation of the output shaft 11. Here, when it is detected by the signal from the potentiometer 82 that the output shaft 11 has reached a predetermined rotational angle position at which the toilet seat 5 is disposed at the open position 5B, the control device stops supplying power to the motor 16. As a result, the toilet seat 5 reaches the open position 5B.

  On the other hand, when the toilet seat 5 is in the open position 5B and the control device receives an input from a switch, a sensor, or the like, the control device supplies the motor 16 with electric power having a second polarity opposite to the first polarity. The motor 16 is rotated in a second direction opposite to the first direction. Thereby, the closing operation for closing the toilet seat 5 is started. When the motor 16 is driven, the rotation of the motor 16 is transmitted via the first planetary gear mechanism 30, the second planetary gear mechanism 40, and the mysterious planetary gear mechanism 50, as in the case of the opening operation, and the rotation of the output shaft 11. Is output as Here, when it is detected by the signal from the potentiometer 82 that the output shaft 11 has reached a predetermined rotational angle position at which the toilet seat 5 is disposed at the closed position 5A, the control device stops supplying power to the motor 16. Thereby, the toilet seat 5 is arrange | positioned in the closed position 5A.

  Here, the toilet seat 5 may be manually opened and closed by the user of the western toilet 1. That is, a rotational force may be input from the output shaft 11 side.

  In such a case, when one planetary gear meshes with the first internal gear 53 and the second internal gear 54, the planetary gear and the first internal gear 53 mesh with and come into contact with each other. The magnitude relationship between the distance from the contact portion to the axis L2 of the support shaft 57 and the distance from the contact portion where the planetary gear and the second internal gear 54 are in meshing contact with each other to the axis L2 of the support shaft 57 is reversed. There is a problem in that the time is generated and the driving force transmission mechanism 17 is locked. In this example, the first planetary gear 55 meshes with the first internal gear 53 and the second planetary gear 56 meshes with the second internal gear 54 in this example. Further, the first planetary gear 55 and the second planetary gear 56 have different pitch circle diameters Q2, and the first planetary gear 55 and the first internal gear 53 are in meshing contact with each other. The first distance d1 from t1 to the axis L2 of the support shaft 57 and the second contact portion t2 where the second planetary gear 56 and the second internal gear 54 are in meshing contact with each other to the axis L2 of the support shaft 57. The magnitude relationship with the second distance d2 may change between when rotation is transmitted from the motor 16 side toward the output shaft 11 side and when rotation is input from the output shaft 11 side. Absent. Therefore, even when the toilet seat 5 is manually opened and closed by the user, the driving force transmission mechanism 17 (wonder planetary gear mechanism 50) does not fall into the locked state.

  Further, when the toilet seat 5 is manually opened and closed by the user of the western toilet 1, an excessive torque is input to the driving force transmission mechanism 17 from the output shaft 11 side, and this torque and the cogging torque from the motor 16 are There is a risk that both act on the driving force transmission mechanism 17 and damage the driving force transmission mechanism 17. On the other hand, in the toilet seat opening / closing device 6 of this example, the driving force transmission mechanism 17 includes the tolerance ring 76 (torque limiter), and when excessive torque is input from the output shaft 11 side, the second The internal gear 54 slips with respect to the holding part 22. As a result, the rotational force is transmitted to the pinion 52, the second planetary gear mechanism 40, and the first planetary gear mechanism 30 located upstream of the tolerance ring 76 in the driving force transmission direction from the motor 16 toward the output shaft 11. Can be suppressed or prevented. Therefore, the breakage of the driving force transmission mechanism 17 can be suppressed or avoided, and the manufacturing cost can be suppressed by making the pinion 52, the second planetary gear mechanism 40, and the first planetary gear mechanism 30 from resin having lower strength than metal. Further, the second internal gear 54, the second planetary gear 56, the first planetary gear 55, and the support shafts of the planetary carrier 58 located downstream of the tolerance ring 76 in the driving force transmission direction from the motor 16 toward the output shaft 11. Since both 57 and the output member 62 (the first output gear and the output shaft 11) are made of metal, breakage of these members can be suppressed or prevented.

(Function and effect)
In the toilet seat opening / closing device 6 of this example, since the mysterious planetary gear mechanism 50 of the driving force transmission mechanism 17 is a mysterious planetary gear mechanism having a large reduction ratio, a high torque can be obtained even when a small motor 16 is mounted as a driving source. The toilet seat 5 can be opened and closed.

  Further, in this example, the first planetary gear 55 and the second planetary gear 56 have the same number of teeth and have different pitch circle diameters Q1 and Q2. Therefore, the assembling work of the mysterious planetary gear mechanism 50 is easy. Further, since the number of teeth is the same between the first planetary gear 55 and the second planetary gear 56 and the pitch circle diameters Q1 and Q2 are made different, the first planetary gear 55 and the second planetary gear 56 are made by a mold or the like. It is easy to mold integrally. Moreover, since the area of the junction part of the 1st planetary gear 55 and the 2nd planetary gear 56 can be ensured, the intensity | strength of these junction parts can be improved.

  Further, in this example, the tooth tip of the first planetary gear 55 having a small pitch circle diameter Q1 is located on the outer side in the radial direction from the tooth bottom of the second planetary gear 56. As a result, the pitch circle diameter Q1 of the first planetary gear 55 and the pitch circle diameter Q1 of the second planetary gear 56 are close to each other. Therefore, the number of teeth of the first internal gear 53 meshed with the first planetary gear 55 and the It is easy to reduce the difference in the number of teeth of the second internal gear 54 meshing with the two planetary gears 56, and the reduction ratio of the mysterious planetary gear mechanism 50 can be increased.

  In this example, the tolerance ring 76 constituting the torque limiter is mounted on the mysterious planetary gear mechanism 50 disposed at the downstream end in the driving force transmission direction from the motor 16 toward the output shaft 11. Further, the second internal gear 54 whose rotation is controlled by the tolerance ring 76 has a gear ratio of 0.975 between the output shaft 11 and the first internal gear 53 integral with the output shaft 11. That is, the tolerance ring 76 is not a member between which the rotation input to the output shaft 11 is greatly increased and the frame 15 but a member to which a rotation substantially equal to the rotation input to the output shaft 11 is transmitted. It is arranged between the frames 15. Therefore, when the excessive rotational force is input from the output shaft 11 side, it is avoided that the second internal gear 54 slips at high speed with respect to the holding portion 22 and the tolerance ring 76 is seized. it can.

  Furthermore, in this example, the holding portion 22 holds the second internal gear 54 via the tolerance ring 76, whereby the inclination of the second internal gear 54 can be prevented. As a result, the tolerance ring 76 can be deformed in the radial direction with a good balance, and variation in slipping torque is reduced.

  In this example, the motor 16 and the mysterious planetary gear mechanism 50 are arranged in parallel in the longitudinal direction of the frame 15. As shown in FIG. 2, in the mysterious planetary gear mechanism 50, the length dimension in the axis L direction from the upper end 60b of the cylindrical portion 60 of the first internal gear 53 to the lower end 54c of the second internal gear 54 is the motor. The upper end 60b of the cylindrical portion 60 of the first internal gear 53 and the non-output side end surface 27 of the motor 16 main body are shorter than the length dimension from the counter output side end surface 27 to the output side end surface 26 of the 16 main body. It is almost at the same height in the direction. In addition to this, the substrate 83 of the angular position detection mechanism 18 is located below the non-output side end face 27 of the motor 16 body when viewed from the direction orthogonal to the axis L of the output shaft 11, and the potentiometer 82 is It is attached to the lower surface of the substrate 83. Therefore, the toilet seat opening / closing device 6 is compact in the axis L direction.

  Further, in the present example, as the first planetary gear 55 and the second planetary gear 56, three first planetary gears 55 and second planetary gears 56 are provided, respectively, and the three first planetary gears 55 and second planetary gears 56 are provided. The planetary gears 56 are arranged at equiangular intervals around the axis L of the output shaft 11. Therefore, it is easy to arrange the second internal gear 54, the planet carrier 58, and the first internal gear 53 coaxially.

(Other embodiments)
In the above example, the first planetary gear 55 and the second planetary gear 56 have the same number of teeth and different modules and pitch circle diameters Q1 and Q2, but the first planetary gear 55 and the second planetary gear 56 are different from each other. The pitch circle diameters Q1 and Q2 may be made different by changing the number of teeth with the same module. Even in this case, the first distance d1 from the first contact portion t1 where the first planetary gear 55 and the first internal gear 53 are in meshing contact with each other to the axis L2 of the support shaft 57, and the second planetary gear. 56 and the second internal gear 54 are in meshing contact with each other, the magnitude relationship between the second distance d2 from the second contact portion t2 to the axis L2 of the support shaft 57 is from the motor 16 side to the output shaft 11 side. It is possible to configure so that the rotation does not change between when the rotation is transmitted toward and when the rotation is input from the output shaft 11 side.

  In the above example, the second internal gear 54 is held by the holding portion 22 from the inner peripheral side, and the tolerance ring 76 is provided between the inner peripheral surface of the second internal gear 54 and the outer peripheral surface of the holding portion 22. However, the holding portion 22 may be formed in a cylindrical shape so that the annular outer peripheral surface of the second internal gear 54 is held by the annular inner peripheral surface of the holding portion 22. In this case, the tolerance ring 76 may be disposed between the annular outer peripheral surface of the second internal gear 54 and the annular inner peripheral surface of the holding portion 22.

  In the above example, the tolerance ring 76 is used as the torque limiter. However, a mechanism using a ratchet can be formed between the outer peripheral surface of the holding portion 22 and the second internal gear 54 as the torque limiter.

  In the above example, the motor 16 and the second planetary gear mechanism 40 are arranged in parallel. However, the motor 16, the first planetary gear mechanism 30, the second planetary gear mechanism 40, the mysterious planetary gear mechanism 50, and the output shaft 11 are arranged. May be arranged coaxially. In this case, the toilet seat opening / closing device 6 can be configured in a compact manner in a direction orthogonal to the axis L of the output shaft 11.

  In the above example, the lid driving device is used for opening and closing the toilet seat 5, but it can also be used as an opening and closing device for opening and closing the toilet lid 3. In addition, the lid driving device of the present invention can be used as an opening / closing device for opening / closing an opening / closing door that opens and closes a loading port for loading laundry into the washing tub on the upper surface of the washing machine.

5 ... Toilet seat (lid)
6 ... Toilet seat opening / closing device (lid body drive device)
DESCRIPTION OF SYMBOLS 11 ... Output shaft 15 ... Frame 16 ... Motor 17 ... Driving force transmission mechanism 22 ... Holding part 40 ... 2nd planetary gear mechanism (deceleration mechanism)
47 ... Projection of planetary carrier (connecting member)
50 ... Mysterious planetary gear mechanism 52 ... Pinion (sun gear)
53 ... 1st internal gear 54 ... 2nd internal gear 55 ... 1st planetary gear 56 ... 2nd planetary gear 57 ... Spindle 58 ... Planetary carrier 76 ... Tolerance ring (torque limiter)
d1... first distance d2... second distance L... output shaft axis L2... planetary carrier support axis t1... first contact portion t2. ... Pitch circle diameter Q2 of the first planetary gear ... Pitch circle diameter of the second planetary gear

Claims (10)

A motor, an output shaft, and a driving force transmission mechanism that transmits the rotation of the motor to the output shaft, and the driving force transmission mechanism includes a strange planetary gear mechanism that decelerates the rotation of the motor; In the lid driving apparatus for opening and closing the lid connected to the output shaft,
The mysterious planetary gear mechanism includes a first internal gear and a second internal gear that are arranged coaxially with the output shaft and spaced apart in the axial direction, a first planetary gear that meshes with the first internal gear, and A second planetary gear arranged coaxially with the first planetary gear and meshing with the second internal gear; a planet carrier for holding the first planetary gear and the second planetary gear so as to be capable of rotating about a support shaft; A sun gear meshing with the second planetary gear,
The sun gear is an input element;
The first internal gear is an output element;
The second internal gear is a fixed element;
The first planetary gear and the second planetary gear are integral;
A first distance from a first contact portion t1 where the first planetary gear and the first internal gear are in meshing contact with each other, an axis of the support shaft, and the second planetary gear and the second internal gear. This is different from the second distance from the second contact portion t2 in meshing contact with the gear to the axis of the support shaft, and the magnitude relationship between the first distance and the second distance changes. There is no lid, The cover body drive device characterized by the above-mentioned. In claim 1,
The first planetary gear and the second planetary gear have different pitch circle diameters, and the tip of one planetary gear having a small pitch circle diameter is located radially outward from the tooth bottom of the other planetary gear. A lid driving device characterized by being positioned. In claim 2,
The lid driving device according to claim 1, wherein the first planetary gear and the second planetary gear have the same number of teeth. In any one of claims 1 to 3,
A frame on which the driving force transmission mechanism is mounted;
Between the holding portion holding the second internal gear in the frame and the second internal gear, when the torque greater than a preset torque is applied to the second internal gear, the holding A lid drive device, wherein a torque limiter for sliding the second internal gear with respect to the portion is arranged. In claim 4,
The lid driving apparatus according to claim 1, wherein the first internal gear is integrated with the output shaft. In claim 4 or 5,
The first internal gear, the first planetary gear, the second planetary gear, the support shaft, and the second internal gear are made of metal, and the lid driving apparatus. In claim 4,
The holding portion protrudes in the axial direction, is inserted on the inner peripheral side of the second internal gear, and holds the second internal gear from the inner peripheral side,
The said torque limiter is comprised between the outer peripheral surface part facing the said 2nd internal gear in the said holding | maintenance part, and the said 2nd internal gear, The cover body drive device characterized by the above-mentioned. In claim 7,
The torque limiter is a tolerance ring,
The tolerance ring is attached to the outer peripheral surface portion of the holding portion. In claim 7 or 8,
The driving force transmission mechanism includes a reduction mechanism disposed adjacent to the upstream side of the mysterious planetary gear mechanism in a driving force transmission direction from the motor toward the output shaft,
The holding part is cylindrical,
A lid driving apparatus characterized in that a connecting member for connecting the output element of the speed reduction mechanism and the sun gear so as to be integrally rotatable penetrates the inner peripheral side of the holding portion. In any one of claims 1 to 9,
The first planetary gear and the second planetary gear each include three or more of the first planetary gear and the second planetary gear,
Three or more of the first planetary gear and the second planetary gear are arranged at equiangular intervals around the axis of the output shaft.

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