JP2009030617A - Motor device and motor device with reduction gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor device and a motor device with a reduction gear, which are used without complicating the assembling process even under circumstances where there is covered with water. <P>SOLUTION: A thrust bearing 70 screwed into a cylindrical housing part 54 comprises a male screw 72 screwed into a female screw 59 and a bearing side first cylindrical part 73 in which an O-ring 61 is installed. A case side cylindrical part 57a is formed in an opening 57 of a reduction gear case 51 to elastically deform the O-ring 61 by screwing the thrust bearing 70. As a result, the thrust bearing 70 is screwed into the female screw 59 by installing the O-ring 61 into the bearing side first cylindrical part 73 so as to make sealing between the inside and the outside of the reduction gear case 51 and to prevent axial rattling for the reduction gear case 51 of a worm shaft 53 concurrently, which is adapted to use under the circumstances where there is covered with water without complicating the assembling processing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a motor device used as an actuator such as a power window device mounted on a vehicle and a motor device with a reduction gear.

  Conventionally, as an actuator for a power window device mounted on a vehicle such as an automobile, the rotary drive force of the armature shaft (rotating shaft) is high output in order to open and close the window glass with a small driving source that can be housed in the door. A motor device (a motor device with a reduction gear) including a reduction gear to be converted is used. The motor device with a speed reducer includes a bottomed motor case (yoke), an armature shaft that is rotatably provided in the motor case, a worm gear that is integrally provided at an end of the armature shaft, and a worm gear. And a reduction gear case that accommodates the meshing worm wheel. Then, the rotation of the armature shaft is decelerated by a speed reducer composed of a worm gear and a worm wheel, and as a result, the driving force with high output is transmitted to the elevating mechanism to open and close the window glass supported by the elevating mechanism. Can do.

  By the way, there is an armature shaft of such a motor device in which a predetermined clearance exists between both ends in the axial direction and each case, and the armature shaft is caused by a reaction force from the driven object (window glass). May reciprocate in the motor case and the reducer case in the axial direction, and the armature shaft may collide with each case to generate a hitting sound. Therefore, in order to suppress the occurrence of such a hitting sound or the like, there is provided a motor device that is provided with a thrust adjustment screw that supports the armature shaft from the axial direction, and eliminates play in each case of the armature shaft by this thrust adjustment screw. For example, it is described in Patent Document 1.

The motor device described in Patent Document 1 includes a thrust adjustment screw (male screw portion) that is screw-coupled to a female screw (female screw portion) formed in a motor housing (reduction gear case). The armature shaft is supported from the axial direction via the resin cap. This thrust adjusting screw is screwed to a female screw formed on the motor housing and adjusted for thrust, i.e., after eliminating the above-mentioned backlash, the nut is screwed to fix and hold the motor housing. Made.
JP 2001-330027 A (FIGS. 1 and 2)

  However, according to the motor device described in Patent Document 1 described above, moisture may enter the motor housing through the gap between the thrust adjustment screw and the female screw. Therefore, when the motor device is used in a wet environment, for example, when it is used as an actuator for a power window device or a wiper device exposed to rainwater or the like that has entered the door through the window glass, an assembly process thereof. However, it is necessary to apply a liquid sealant or the like between the nut and the motor housing and between the nut and the thrust adjusting screw without any gaps. In this case, a waterproofing work for applying the liquid sealant to a predetermined location is separately required during the assembly process of the motor device, which causes a problem that the assembly process of the motor device is complicated.

  An object of the present invention is to provide a motor device and a motor device with a speed reducer that can be used even in a wet environment without complicating the assembly process.

  The motor device of the present invention is a motor device having a rotating shaft and a case that rotatably accommodates the rotating shaft, and is provided in the case, and communicates the inside and the outside of the case. A communication hole having a cylindrical portion and a female screw portion formed continuously with the case-side cylindrical portion, and is screwed into the female screw portion from the outside of the case, supports one end of the rotary shaft, and A thrust bearing that adjusts a gap between the other end and the case; and an annular seal that is attached to the thrust bearing and seals between the thrust bearing and the communication hole. The thrust bearing includes the female screw And a bearing-side first cylindrical portion that is formed continuously with the male screw portion so as to face the case-side cylindrical portion and to which the annular seal is mounted. , And characterized in that sandwich the annular seal between said casing-side cylindrical portion and the bearing-side first cylindrical portion.

  In the motor device according to the present invention, the case-side cylindrical portion is provided in the vicinity of the opening of the communication hole in the case, and the female screw portion is provided on the inner side of the hole of the communication hole and has a smaller inner diameter than the case-side cylindrical portion. The bearing-side first cylindrical portion is formed to have an outer diameter size that is the same as or slightly larger than the outer diameter size of the top of the thread of the male screw portion, and the annular seal is in a natural state. The inner diameter dimension is smaller than that of the first cylindrical portion on the bearing side.

  In the motor device according to the present invention, the case-side cylindrical portion is provided on the back side of the communication hole in the case, and the female screw portion is provided on the opening side of the communication hole and is larger than the case-side cylindrical portion. It is formed in the diameter dimension, The inside diameter dimension in the natural state of the said annular seal was made smaller than the said bearing side 1st cylindrical part, It is characterized by the above-mentioned.

  The motor device according to the present invention is characterized in that an inner diameter dimension of a thread groove bottom portion at least on a hole back side of the case of the female screw portion is smaller than an outer diameter size of a screw thread top portion of the male screw portion.

  In the motor device of the present invention, the thrust bearing further includes a bearing-side second cylindrical portion positioned near the opening of the communication hole, and at least one of the case and the bearing-side second cylindrical portion is made of a resin material. In addition, the case and the thrust bearing are fixed by forming a recess in one of the other and melting one of the resin materials into the recess.

  The motor device of the present invention is characterized in that a thrust plate that supports one end of the rotating shaft is fixed to a portion of the thrust bearing that faces the one end of the rotating shaft.

  The motor device with a reduction gear according to the present invention includes an armature shaft, a motor case that rotatably accommodates the armature shaft, a worm shaft that rotates integrally with the armature shaft, and a worm wheel that meshes with a worm gear of the worm shaft. A motor device with a speed reducer having a speed reducer case, provided in the speed reducer case, communicating between the inside and the outside of the speed reducer case, and continuous with the case side cylindrical portion and the case side cylindrical portion A communication hole having a female screw portion formed, and screwed into the female screw portion from the outside of the speed reducer case to support one end of the worm shaft, and between the other end of the armature shaft and the motor case A thrust bearing that adjusts the clearance, and is attached to the thrust bearing, and seals between the thrust bearing and the communication hole. An annular seal, and the thrust bearing is formed continuously from the external thread portion to be screwed into the internal thread portion and the external thread portion so as to face the case-side cylindrical portion, and is mounted with the annular seal. A first side cylindrical portion, and the annular seal is sandwiched between the case side cylindrical portion and the bearing side first cylindrical portion.

  In the motor device with a reduction gear according to the present invention, the case-side cylindrical portion is provided in the vicinity of the opening of the communication hole in the reduction gear case, and the female screw portion is provided on the deep side of the hole of the communication hole. The bearing-side first cylindrical portion is formed to have an outer diameter that is the same as or slightly larger than the outer diameter of the thread crest of the male screw portion, The natural diameter of the seal in a natural state is smaller than that of the first cylindrical portion on the bearing side.

  In the motor device with a reduction gear according to the present invention, the case-side cylindrical portion is provided on the deep side of the communication hole in the reduction gear case, and the female screw portion is provided on the opening side of the communication hole and the case-side cylinder. The outer diameter of the annular seal is smaller than that of the first seal, and the inner diameter of the annular seal in a natural state is smaller than that of the first cylindrical portion on the bearing side.

  The motor device with a reduction gear according to the present invention is characterized in that an inner diameter dimension of a thread groove bottom portion of at least the inner side of the hole of the reduction gear case of the female screw portion is made smaller than an outer diameter size of a screw thread top portion of the male screw portion. And

  In the motor device with a reduction gear according to the present invention, the thrust bearing further includes a bearing-side second cylindrical portion positioned in the vicinity of the opening of the communication hole, and at least one of the reduction gear case and the bearing-side second cylindrical portion. One is formed of a resin material, and a recess is formed in one of the other, and the reduction gear case and the thrust bearing are fixed by melting and entering one of the resin materials into the recess. To do.

  The motor device with a reduction gear according to the present invention is characterized in that a thrust plate that supports one end of the worm shaft is fixed to a portion of the thrust bearing facing the one end of the worm shaft.

  According to the present invention, the thrust bearing to be screwed into the female screw portion of the case is formed continuously from the male screw portion to be screwed into the female screw portion and the male screw portion so as to face the case side cylindrical portion, and the annular seal is mounted. Bearing-side first cylindrical portion, and an annular seal is sandwiched between the case-side cylindrical portion and the bearing-side first cylindrical portion, so that the annular seal is attached to the bearing-side first cylindrical portion. By screwing the thrust bearing into the female thread portion, it is possible to seal between the inside and the outside of the case. At this time, since the annular seal is elastically deformed between the case-side cylindrical portion and the bearing-side first circular portion, the space between the case and the thrust bearing can be reliably sealed. Also, by screwing the thrust bearing into the case, it is possible to prevent backlash against the case of the rotating shaft and to seal between the case and the thrust bearing, so it can be used in a wet environment without complicating the assembly process. Can be provided.

  According to the present invention, the case-side cylindrical portion is provided in the vicinity of the opening of the communication hole in the case, the female screw portion is provided on the inner side of the hole of the communication hole, and has a smaller inner diameter than the case-side cylindrical portion. The cylindrical portion is formed to have an outer diameter size that is the same as or slightly larger than the outer diameter size of the screw thread top portion of the male screw portion, and the inner diameter size in the natural state of the annular seal is set to be larger than that of the first cylindrical portion on the bearing side. Since it was made small, when the annular seal is mounted on the bearing-side first cylindrical portion, it is possible to prevent the annular seal from dropping off from the bearing-side first cylindrical portion until the thrust bearing is screwed into the case. Accordingly, since the annular seal can be reliably assembled without dropping off in the manufacturing process of the motor device, the manufacturing failure of the motor device can be reduced and the yield can be improved.

  According to the present invention, the case-side cylindrical portion is provided on the back side of the communication hole in the case, the female screw portion is provided on the opening side of the communication hole, and has a larger outer diameter than the case-side cylindrical portion. Since the inner diameter in the natural state is smaller than that of the bearing-side first cylindrical portion, when the annular seal is attached to the bearing-side first cylindrical portion, the bearing-side first cylindrical portion from when the thrust bearing is screwed into the case is removed. The annular seal can be prevented from falling off. Accordingly, since the annular seal can be reliably assembled without dropping off in the manufacturing process of the motor device, the manufacturing failure of the motor device can be reduced and the yield can be improved. In addition, since the annular seal can be attached to the bearing-side first cylindrical portion without passing through the male screw portion, it is possible to further improve the reliability of moisture.

  According to the present invention, since the inner diameter dimension of the thread groove bottom portion at least on the back side of the hole of the case of the female screw portion is made smaller than the outer diameter size of the screw thread top portion of the male screw portion, both can be coupled in a press-fit state. . At this time, the thrust bearing is automatically centered with respect to the case by the elastic force of the annular seal that is elastically deformed by the case-side cylindrical portion. Reliability can be improved.

  According to the present invention, the thrust bearing further includes the bearing-side second cylindrical portion positioned near the opening of the communication hole, and at least one of the case and the bearing-side second cylindrical portion is formed of the resin material. Since the case and the thrust bearing are fixed by forming a recess in one of the other and melting one of the resin materials into the recess, the loosening of the thrust bearing with respect to the case can be prevented.

  According to the present invention, since the thrust plate that supports one end of the rotating shaft is fixed to the portion facing the one end of the rotating shaft of the thrust bearing, it is possible to prevent the heat generated by the rotation of the rotating shaft from being directly transmitted to the thrust bearing. Can do. Therefore, wear of the thrust bearing can be suppressed and the life of the motor device can be extended.

  According to the present invention, the thrust bearing screwed into the speed reducer case is formed continuously with the male screw portion screwed into the female screw portion and the male screw portion so as to face the case side cylindrical portion, and the annular seal is mounted. Bearing-side first cylindrical portion, and an annular seal is sandwiched between the case-side cylindrical portion and the bearing-side first cylindrical portion, so that the annular seal is attached to the bearing-side first cylindrical portion. By screwing the thrust bearing into the female thread portion, the space between the inside and the outside of the reduction gear case can be sealed. At this time, since the annular seal is elastically deformed between the case side cylindrical portion and the bearing side first cylindrical portion, the space between the reduction gear case and the thrust bearing can be reliably sealed. Also, by screwing the thrust bearing into the reducer case, it is possible to prevent backlash in each of the armature shaft and motor case, worm shaft and reducer case, and seal between the reducer case and thrust bearing. It is possible to provide a motor device with a reduction gear that can be used in a flooded environment without complicating the process.

  According to the present invention, the first cylindrical portion is formed so as to have an outer diameter size that is the same as or slightly larger than the outer diameter size of the thread crest of the male screw portion, and the inner diameter size in the natural state of the annular seal is Since it is smaller than the first cylindrical part on the bearing side, when the annular seal is attached to the first cylindrical part from the male thread part through the top of the screw thread, the first bearing side until the thrust bearing is screwed into the speed reducer case. It is possible to prevent the annular seal from dropping from one cylindrical portion. Therefore, since the annular seal can be reliably assembled without dropping in the manufacturing process of the motor device with a reduction gear, the manufacturing failure of the motor device with the reduction gear can be reduced and the yield can be improved.

  According to the present invention, the case-side cylindrical portion is provided on the back side of the communication hole in the reduction gear case, the female screw portion is provided on the opening side of the communication hole, and has a larger outer diameter than the case-side cylindrical portion. Since the inner diameter of the seal in the natural state is smaller than that of the first cylindrical portion on the bearing side, when the annular seal is mounted from the male screw portion side to the first cylindrical portion on the bearing side, the thrust bearing is screwed into the reducer case. It is possible to prevent the annular seal from falling off from the first cylindrical portion on the bearing side. Therefore, since the annular seal can be reliably assembled without dropping in the manufacturing process of the motor device with a reduction gear, the manufacturing failure of the motor device with the reduction gear can be reduced and the yield can be improved. In addition, since the annular seal can be attached to the bearing-side first cylindrical portion without passing through the male screw portion, it is possible to further improve the reliability of moisture.

  According to the present invention, the inner diameter dimension of the thread groove bottom part at least on the back side of the hole of the reduction gear case of the female screw part is made smaller than the outer diameter dimension of the screw thread top part of the male screw part, so that both are coupled in a press-fit state. Can do. At this time, since the thrust bearing is automatically centered with respect to the reducer case by the elastic force of the annular seal that is elastically deformed by the case side cylindrical portion, the sealing performance of the annular seal is maintained well. Water coverage reliability can be improved.

  According to the present invention, the thrust bearing further includes the bearing-side second cylindrical portion positioned near the opening of the communication hole, and at least one of the reduction gear case and the bearing-side second cylindrical portion is formed of the resin material. In addition, a recess is formed in one of the other, and one of the resin material is melted and inserted into the recess to fix the speed reducer case and the thrust bearing, thereby preventing the slack bearing from loosening with respect to the speed reducer case. be able to.

  According to the present invention, since the thrust plate that supports one end of the worm shaft is fixed to the portion of the thrust bearing that faces the one end of the worm shaft, heat generated by the rotation of the worm shaft is prevented from being directly transmitted to the thrust bearing. Can do. Therefore, the wear of the thrust bearing can be suppressed and the life of the motor device with a reduction gear can be extended.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  1 is a cross-sectional view of the power window motor, FIG. 2 is an enlarged partial cross-sectional view of the broken line circle A portion of FIG. 1, FIG. 3 is an enlarged perspective view of the thrust bearing peripheral portion of FIG. ) And (b) respectively represent a C arrow view and a D arrow view of FIG. 3.

  As shown in FIG. 1, a power window motor (motor device with a speed reducer) 10 as a motor device constitutes a power window device provided inside a door of an automobile (not shown). The power window motor 10 has a thin shape so that it can be accommodated in a narrow space inside the door of an automobile, thereby improving the layout of the door.

  The power window motor 10 includes a motor unit 20, a connector connection unit 40, and a speed reduction mechanism unit 50. The motor unit 20 includes a motor case (yoke) 21 as a case formed by press-molding a thin steel plate made of a magnetic material into a bottomed stepped cylindrical shape, and an inner side of the main body 21 a of the motor case 21. A pair of permanent magnets (magnets) 22 arranged opposite to each other in the radial direction, and a rotor (armature rotor) 23 provided rotatably inside each permanent magnet 22 via a predetermined gap (air gap). I have.

  An armature shaft (rotating shaft) 24 is provided through the central axis of the rotor 23, and the base end side (the other end) of the armature shaft 24 is a steel material attached to the stepped bottom 21 b of the motor case 21. A cylindrical radial bearing 25 is rotatably supported. A steel ball 26 a is mounted in a recess provided on the base end side of the armature shaft 24, and the steel ball 26 a is attached to a thrust plate 26 b disposed on the bottom of the stepped bottom 21 b of the motor case 21. The rotational resistance of the armature shaft 24 is reduced by contact.

  A commutator 27 that is electrically connected to a coil 23 a wound around the rotor 23 is provided adjacent to the distal end side (one end) of the armature shaft 24, and the commutator 27 includes a motor case 21. A brush 29 attached to a brush holder 28 made of a resin material attached to the opening side of the opening is in sliding contact with a predetermined elastic force.

  A sensor magnet 30 is fixed to the end of the armature shaft 24 from the commutator 27, and the sensor magnet 30 has N poles, S poles, N poles, and S poles along the circumferential direction of the armature shaft 24. .. (Not shown), and permanent magnets are alternately arranged to form a substantially circular shape. The sensor magnet 30 can be opposed to the Hall element 42 provided in the connector connecting portion 40, and each magnetic pole according to the rotation of the sensor magnet 30 faces the Hall element 42. 42 is turned on or off, so that the rotation speed, rotation direction, and the like of the armature shaft 24 can be detected.

  The connector connecting portion 40 is formed in a predetermined shape by a resin material. In the connector connecting portion 40, a plurality of terminals 41, 41 to which a vehicle-side power supply connector (not shown) is connected are embedded by insert molding or the like. Yes. The other end side (not shown) of each terminal 41, 41 is electrically connected to a lead plate (not shown) mounted on the brush holder 28 to constitute an electric circuit with the brush 29, choke coil (not shown) and the like. Arranged to do. Each terminal 41 and 41 is also electrically connected to the hall element 42.

  The speed reduction mechanism 50 includes a speed reducer case (case) 51 made of a resin material, and a worm wheel 52 is rotatably mounted in the speed reducer case 51. An output shaft 52a is integrally provided at the rotation center of the worm wheel 52, and an arm member or the like of a lifting mechanism for supporting a window glass (not shown) is attached to the output shaft 52a. A gear tooth 52b made of a spur gear is integrally provided on the outer periphery of the worm wheel 52, and a worm gear 53a provided integrally with a worm shaft (rotary shaft) 53 is provided on the gear tooth 52b. It comes to mesh.

  The speed reducer case 51 is formed with a cylindrical housing portion 54 that rotatably accommodates the worm shaft 53, and the cylindrical housing portion 54 has both ends extending in the left-right direction in the figure. The side is open. A cylindrical radial bearing 55 made of a steel material that rotatably supports the distal end side of the worm shaft 53 is mounted on the inner side of the cylindrical housing portion 54, and on the motor portion 20 side of the cylindrical housing portion 54. A cylindrical radial bearing 56 made of a steel material that rotatably supports the proximal end side of the worm shaft 53 is mounted. Thus, the worm shaft 53 is rotatably supported by the radial bearings 55 and 56, so that the rotation shaft can be smoothly rotated without shifting.

  A mounting recess 53b having a substantially rectangular cross section is formed on the proximal end side of the worm shaft 53. The mounting recess 53b has a substantially rectangular cross section provided on the distal end side of the armature shaft 24. A mounting protrusion 24a having a shape is mounted so as not to be relatively rotatable. Therefore, the rotational driving force of the armature shaft 24 is transmitted to the worm shaft 53 without loss of driving, and both rotate integrally.

  As shown in FIGS. 2 and 3, one end side (left side in the drawing) of the cylindrical housing portion 54 is provided with an opening 57 as a communication hole that communicates the inside and the outside of the reducer case 51. . Four concave portions 58, 58,... Are formed at equal intervals along the circumferential direction of the case side cylindrical portion 57a of the opening portion 57 of the cylindrical housing portion 54. A resin material is formed in each concave portion 58. A thrust bearing 70 is melted and poured. That is, the melted portion 71 (see the broken line circle B portion) of the thrust bearing 70 enters the concave portions 58, thereby preventing the thrust bearing 70 from loosening with respect to the speed reducer case 51. ing. However, the number of the recesses 58 is not limited to four at the same interval as described above, but at least one recess may be formed. In the case where a plurality of the recesses 58 are formed, they may not be formed at the same interval. In short, it is only necessary to prevent the thrust bearing 70 from loosening with respect to the speed reducer case 51.

  A female screw part 59 into which the thrust bearing 70 is screwed is formed on the hole deeper side (right side in the figure) than the case side cylindrical part 57a of the opening 57. The inner diameter dimension of the female thread portion 59 is set smaller than the inner diameter dimension of the case-side cylindrical portion 57 a of the opening 57, and a stepped portion 60 is formed between the opening 57 and the female thread portion 59. . Further, a second screw groove bottom 59b having an inner diameter smaller than the inner diameter of the first screw groove bottom 59a forming the female screw 59 is formed near the inside of the reduction gear case 51 in the female screw 59. Yes.

  As shown in FIGS. 2 to 4, the thrust bearing 70 is a male screw having a thread crest portion 72 a having a predetermined diameter that is screwed into the female screw portion 59 formed in the cylindrical housing portion 54 from the outside of the speed reducer case 51. A bearing-side first cylindrical portion 73 formed integrally with the male threaded portion 72 so as to face the case 72 and the case-side cylindrical portion 57a and having an O-ring (annular seal) 61 mounted on the outer peripheral side thereof; It is comprised from the bearing side 2nd cylindrical part 74 formed in the bearing side 1st cylindrical part 73 integrally and continuously. Further, a hexagon wrench T1 (see FIG. 8) as a fastening tool is inserted into the bearing side second cylindrical portion 74 side of the thrust bearing 70 for screwing the thrust bearing 70 into the female thread portion 59 of the cylindrical housing portion 54. A substantially regular hexagonal tool hole 75 is formed. However, the tool hole 75 may have a shape corresponding to, for example, a plus screwdriver or a minus screwdriver depending on the fastening tool to be used.

  The outer diameter of the bearing-side first cylindrical portion 73 of the thrust bearing 70 is set to be slightly larger than the outer diameter of the male screw portion 72. That is, as shown in FIG. 2, the bearing-side first cylindrical portion 73 is formed to have a radial dimension difference D with respect to the screw thread top portion 72 a of the male screw portion 72. The natural diameter of the O-ring 61 is set to be smaller than the bearing-side first cylindrical portion 73, and the outer diameter when the O-ring 61 is attached to the bearing-side first cylindrical portion 73 is the case-side cylindrical portion 57a. It is set to be larger than the inner diameter. Thus, when the O-ring 61 is mounted from the male screw portion 72 side toward the bearing-side first cylindrical portion 73, the O-ring 61 itself is held by the bearing-side first cylindrical portion 73 by the elastic force. Yes.

  As shown in FIG. 2, the inner diameter dimension of the second thread groove bottom portion 59b of the female thread portion 59 is set to a value smaller than the outer diameter dimension of the thread crest portion 72a of the male thread portion 72, and there is a relationship having a radial dimension difference R. It has become. As a result, the male screw portion 72 is screwed into the first screw groove bottom portion 59a of the female screw portion 59, and when the screw thread top portion 72a reaches the second screw groove bottom portion 59b, the screw thread top portion 72a bites into the second screw groove bottom portion 59b. Thus, the backlash caused by the dimensional error S generated during the production of the female screw portion 59 and the male screw portion 72 is absorbed, and both can be firmly fixed.

  The bearing-side first cylindrical portion 73 of the thrust bearing 70 presses the O-ring 61 in the radial direction between the case-side cylindrical portions 57a of the cylindrical accommodating portion 54 by screwing the thrust bearing 70 into the cylindrical accommodating portion 54. To be elastically deformed. Here, the O-ring 61 is elastically deformed by the case-side cylindrical portion 57a before the screw thread top portion 72a of the male screw portion 72 is screwed to the second screw groove bottom portion 59b of the cylindrical housing portion 54. It has become. As a result, the elastic force of the O-ring 61 acts evenly along the circumferential direction of the thrust bearing 70 during the screwing of the thrust bearing 70 into the cylindrical housing portion 54. As a result, the thrust bearing 70 is 54 is automatically centered.

  As described above, the O-ring 61 is sandwiched between the bearing-side first cylindrical portion 73 of the thrust bearing 70 and the case-side cylindrical portion 57a of the cylindrical housing portion 54 in a state of being elastically deformed in the radial direction. By doing so, each member is sealed, and moisture is prevented from entering from the outside of the reduction gear case 51 toward the inside.

  A substantially square-shaped mounting recess 76 is formed on the male threaded portion 72 side of the thrust bearing 70, and the mounting recess 76 has a substantially square shape with corners chamfered in a substantially arc shape as shown in FIG. The thrust plate 77 is fitted and fixed. The thrust plate 77 is formed by punching a steel plate by punching or the like, and a steel ball 62 mounted in a recess provided on the tip side of the worm shaft 53 comes into contact therewith. Therefore, the thrust bearing 70 supports the worm shaft 53 so as to be rotatable from the axial direction via the thrust plate 77 and the steel ball 62.

  Then, by screwing the thrust bearing 70 into the cylindrical housing portion 54 by a predetermined amount, the armature shaft 24 and the thrust bearing 26 are pressed toward the stepped bottom portion 21b of the motor case 21 through the worm shaft 53 with a predetermined pressure. Thus, it is possible to adjust so as to eliminate a gap generated between the armature shaft 24 and the motor case 21 (so as to absorb backlash).

  A predetermined clearance CL is provided between the O-ring 61 and the stepped portion 60 so that the adjustment of the thrust bearing 70 is not hindered by the O-ring 61 when the thrust bearing 70 is screwed into the cylindrical housing portion 54. It is provided. As a result, when the thrust bearing 70 is screwed into the cylindrical housing portion 54 in the thrust direction, the O-ring 61 can be adjusted without being compressed in the thrust direction.

  Next, the assembly procedure of the power window motor 10 according to the first embodiment configured as described above will be described in detail with reference to FIGS. FIG. 5 is an explanatory view for explaining the assembly procedure of the thrust bearing assembly, FIG. 6 is an explanatory view for explaining the assembly procedure of the reduction gear case assembly, and FIG. 7 is an explanatory view for explaining the assembly procedure of the motor unit assembly. FIG. 8 is an explanatory diagram for explaining the assembly procedure of each assembly.

  As shown in FIG. 5, first, an O-ring 61 is attached to the bearing-side first cylindrical portion 73 of the thrust bearing 70 from the male screw portion 72 side as indicated by an arrow in the figure. At this time, the O-ring 61 can be attached to the bearing-side first cylindrical portion 73 without being forcibly twisted by the male screw portion 72. Subsequently, the thrust plate 77 is fitted into the mounting recess 76 (see FIG. 2) as indicated by an arrow in the figure. Thereby, the thrust bearing assembly SA (see FIG. 6) is completed. Here, the O-ring 61 and the thrust plate 77 may be attached to the thrust bearing 70 in the reverse procedure to the above.

  Next, a reduction gear case 51 is prepared as shown in FIG. 6, and the radial bearing 55 is press-fitted into a predetermined position inside the cylindrical housing portion 54 as indicated by an arrow in the drawing. Thereafter, the thrust bearing assembly SA is screwed into the cylindrical housing portion 54 by a predetermined amount from the direction of the arrow in the drawing and temporarily fixed. Here, the thrust bearing assembly SA is thrust by the elastic force of the O-ring 61 by screwing in an amount that the first screw thread top portion 72a of the male screw portion 72 does not reach the second screw groove bottom portion 59b (see FIG. 2). The assembly SA is automatically centered with respect to the cylindrical housing portion 54. Therefore, the O-ring 61 is exerted with excellent sealing performance after assembling without excessive stress being applied.

  Subsequently, the worm shaft 53 with the steel ball 62 attached to the tip side is attached so as to penetrate the radial bearing 55 from the direction of the arrow in the figure, and the tip side steel ball 62 is attached to the thrust bearing assembly SA (thrust plate). 77). Thereafter, the radial bearing 56 is press-fitted into a predetermined position inside the cylindrical housing portion 54. Then, the connector connecting portion 40 is mounted so as to face the speed reducer case 51 from the direction of the arrow in the figure, and the worm wheel 52 so that the gear teeth 52b of the worm wheel 52 are engaged with the worm gear 53a of the worm shaft 53. Align and wear. Thereby, the reduction gear case assembly GA (see FIG. 8) is completed.

  Next, as shown in FIG. 7, the motor case 21 is prepared, and first, the thrust plate 26 b and the radial bearing 25 are mounted inside the stepped bottom portion 21 b of the motor case 21 as indicated by the arrows in the figure. Then, the rotor assembly RA to which the armature shaft 24, the thrust bearing 26, and the like are assembled is assembled into the motor case 21. At this time, as shown in FIG. 2, the armature shaft 24 is mounted so as to penetrate the radial bearing 25, and the steel balls 26a of the armature shaft 24 are brought into contact with the thrust plate 26b. Then, the brush holder 28 is attached to the motor case 21 from the direction of the arrow in the figure, and the brush 29 is brought into contact with the commutator 27. Thereafter, the sensor magnet 30 is fixed at a predetermined position on the distal end side of the armature shaft 24, thereby completing the motor part assembly MA (see FIG. 8).

  Next, as shown in FIG. 8, the speed reducer case assembly GA and the motor unit assembly MA are opposed to each other in a mutually aligned state, and the armature shaft 24 is placed in the mounting recess 53b of the worm shaft 53 shown in FIG. The mounting projection 24a is mounted, and both assemblies GA and MA are mounted so that the sensor magnet 30 of the motor assembly MA faces the Hall element 42 of the reduction gear case assembly GA, and a plurality of fastening screws 78, 78, both assemblies GA and MA are fixed. Thereafter, a test current is supplied from the terminal 41 of the connector connecting portion 40 to the brush 29 to rotate the armature shaft 24 and the worm shaft 53, and the thrust bearing 70 is screwed in using the hexagon wrench T1, as shown in FIG. The screw thread top portion 72a of the male screw portion 72 is screwed in while deforming the second thread groove bottom portion 59b. At this time, the current value of the test current is monitored so that it does not become a value larger than a predetermined current value. That is, when the screwing amount of the thrust bearing 70 is large, the rotational resistance of the armature shaft 24 and the worm shaft 53 increases, and the current value increases. Therefore, the rotational resistance of the armature shaft 24 and the worm shaft 53 is set to an optimum value by monitoring the current value of the test current.

  After the screwing of the thrust bearing 70 is completed, a part of the bearing-side second cylindrical portion 74 of the thrust bearing 70 shown in FIG. 4 is melted by using the heating element tool T2, and the melted molten portion 71 is cylindrical. The concave portion 58 of the accommodating portion 54 is entered. Then, the thrust bearing 70 and the cylindrical housing portion 54 are fixed so as not to be relatively rotatable, thereby completing the power window motor 10. When part of the bearing-side second cylindrical portion 74 of the thrust bearing 70 is melted, it may be melted together with the concave portion 58 of the cylindrical housing portion 54 so as to solidify both.

  As described above, the thrust bearing 70 is screwed into the cylindrical housing portion 54 by a predetermined amount while maintaining the rotational resistance of the armature shaft 24 and the worm shaft 53 at the optimum values, so that the motor case 21 of the armature shaft 24 and the worm shaft 53 and Even if the play to the reduction gear case 51 is eliminated and the reaction force from the window glass is transmitted to the worm wheel 52, the occurrence of a hitting sound or the like is suppressed.

  As described above in detail, according to the power window motor 10 according to the present invention, the thrust bearing 70 screwed into the female screw portion 59 of the cylindrical housing portion 54 includes the male screw portion 72 screwed into the female screw portion 59 and the reduction gear case. 51 is formed continuously with the male threaded portion 72 so as to face the case-side cylindrical portion 57a and includes the bearing-side first cylindrical portion 73 to which the O-ring 61 is attached. By screwing the thrust bearing 70 into the female thread portion 59 with the O-ring 61 attached, the space between the inside and the outside of the reduction gear case 51 can be sealed.

  At this time, since the O-ring 61 is elastically deformed in the radial direction between the case-side cylindrical portion 57a and the bearing-side first cylindrical portion 73, the space between the cylindrical housing portion 54 and the thrust bearing 70 is securely sealed. be able to. Further, by screwing the thrust bearing 70 into the cylindrical housing portion 54, the armature shaft 24 and the worm shaft 53 can be prevented from rattling with respect to the motor case 21 and the reduction gear case 51, and between the cylindrical housing portion 54 and the thrust bearing 70. Therefore, it is possible to provide the power window motor 10 that can be used in a wet environment without complicating the assembly process.

  Further, according to the power window motor 10 according to the present invention, the bearing-side first cylindrical portion 73 is formed so as to have an outer diameter dimension slightly larger than the outer diameter dimension of the screw thread top portion 72a of the male screw portion 72. Since the inner diameter dimension of the seal in the natural state is smaller than that of the bearing-side first cylindrical portion, when the O-ring 61 is attached to the bearing-side first cylindrical portion 73 from the male screw portion 72 via the screw thread top portion 72a, It is possible to prevent the annular seal from dropping off from the bearing-side first cylindrical portion until the thrust bearing is screwed into the case. Therefore, since the O-ring 61 can be reliably assembled without dropping in the manufacturing process of the power window motor 10, it is possible to reduce manufacturing defects of the power window motor 10 and improve the yield.

  Furthermore, according to the power window motor 10 according to the present invention, the inner diameter dimension of the second thread groove bottom portion 59b on the inner side of the hole of the reduction gear case 51 of the female screw portion 59 is set to the outer diameter size of the screw thread top portion 72a of the male screw portion 72. Therefore, the two can be combined in a press-fit state. At this time, the thrust bearing 70 is automatically centered with respect to the cylindrical housing portion 54 by the elastic force of the O-ring 61 that is elastically deformed by the case-side cylindrical portion 57a. Is maintained well, and the reliability of water receiving can be improved.

  Further, according to the power window motor 10 according to the present invention, the bearing-side second cylindrical portion 74 is formed in the thrust bearing 70, and the bearing-side second cylindrical portion 54 is formed in the cylindrical housing portion 54 of the reduction gear case 51. Since the reduction gear case 51 and the thrust bearing 70 are fixed by melting and entering the two cylindrical portions 74, loosening of the thrust bearing 70 with respect to the reduction gear case 51 can be reliably prevented.

  Furthermore, according to the power window motor 10 of the present invention, the nut is screwed to the thrust adjusting screw as before, and the so-called double nut effect is not used to prevent loosening. A pulling force in the axial direction on the accommodating portion 54 does not act. Therefore, both the thrust bearing 70 and the speed reducer case 51 can be formed of a soft material such as a resin material, and the power window motor 10 can be significantly reduced in weight.

  Further, according to the power window motor 10 of the present invention, the thrust plate 77 that supports one end of the worm shaft 53 is fixed to a portion of the thrust bearing 70 that faces the one end of the worm shaft 53, so that the rotation of the worm shaft 53 is performed. It is possible to prevent the heat generated by the heat from being transmitted directly to the thrust bearing 70. Therefore, the wear of the thrust bearing 70 can be suppressed and the life of the power window motor 10 can be extended.

  Next, a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 9 shows a partial cross-sectional view corresponding to FIG. 2 in the second embodiment. In addition, the same code | symbol is attached | subjected about the part which has the same function as 1st Embodiment mentioned above, and the detailed description is abbreviate | omitted.

  Also in the second embodiment, an opening 57 serving as a communication hole that communicates the inside and the outside of the reduction gear case 51 is provided on one end side (left side in the drawing) of the cylindrical housing portion 54.

  A female screw portion 59 into which the thrust bearing 70 is screwed is formed on the deeper side of the hole than the opening 57 (right side in the drawing). The inner diameter dimension of the female thread portion 59 is set smaller than the inner diameter dimension of the opening portion 57. Further, a second screw groove bottom 59b having an inner diameter smaller than the inner diameter of the first screw groove bottom 59a forming the female screw 59 is formed near the inside of the reduction gear case 51 in the female screw 59. Further, on the inner side of the hole, a case-side cylindrical portion 57b is provided that is formed to have the same or slightly smaller diameter than the inner diameter of the screw thread top portion of the female screw portion 59. The case-side cylindrical portion 57b is formed as the inner diameter of the cylindrical housing portion.

  The thrust bearing 70 includes a male screw portion 72 having a thread crest portion 72a having a predetermined diameter that is screwed from the outside of the reduction gear case 51 with respect to the female screw portion 59 formed in the cylindrical housing portion 54, and a distal end side of the male screw portion 72. The bearing-side first cylindrical portion 79 having an O-ring (annular seal) 81 mounted on the outer peripheral side thereof, and the base end side of the female thread portion 59 are integrally formed continuously. And the bearing-side second cylindrical portion 74.

  Further, the inner diameter dimension of the O-ring 81 in the natural state is set to be smaller than the bearing-side first cylindrical part 79, and the outer diameter dimension when mounted on the bearing-side first cylindrical part 79 is the case-side cylindrical part 57b. It is set to be larger than the inner diameter. As a result, when the O-ring 81 is mounted on the bearing-side first cylindrical portion 79 from the front end side of the thrust bearing 70, the bearing-side first cylindrical portion 79 is held by the elastic force of the O-ring 81 itself. Yes.

  The bearing-side first cylindrical portion 79 of the thrust bearing 70 presses the O-ring 81 in the radial direction between the case-side cylindrical portions 57b of the cylindrical accommodating portion 54 by screwing the thrust bearing 70 into the cylindrical accommodating portion 54. It is designed to be elastically deformed. Here, the O-ring 81 is elastically deformed by the case-side cylindrical portion 57b before the screw thread top portion 72a of the male screw portion 72 is screwed to the second screw groove bottom portion 59b of the cylindrical housing portion 54. It has become. As a result, the elastic force of the O-ring 81 acts evenly along the circumferential direction of the thrust bearing 70 during the screwing of the thrust bearing 70 into the cylindrical housing portion 54. As a result, the thrust bearing 70 is 54 (case side cylindrical portion 57b) is automatically centered.

  As described above, the O-ring 81 is sandwiched between the bearing-side first cylindrical portion 79 of the thrust bearing 70 and the case-side cylindrical portion 57b of the cylindrical housing portion 54 in a state of being elastically deformed in the radial direction. By doing so, each member is sealed, and moisture is prevented from entering from the outside of the reduction gear case 51 toward the inside.

  Also in this embodiment, a predetermined clearance CL is provided between the bearing-side second cylindrical portion 74 and the stepped portion 60, and the thrust bearing 70 is screwed into the cylindrical housing portion 54 in the thrust direction. Adjustment in the thrust direction is possible.

  Also in the second embodiment configured as described above, the same operational effects as those of the first embodiment described above can be achieved. In addition to this, according to the second embodiment, the O-ring 81 can be attached to the bearing-side first cylindrical portion 79 without passing through the male screw portion 72, so that it is possible to further improve the reliability of moisture. it can.

  It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, in each of the above embodiments, the power window motor 10 is used as a motor device with a reduction gear. However, the present invention is not limited to this, and for example, a wiper device, a sunroof device, a power slide door device, and the like. The present invention can also be applied to a motor device with a reduction gear used in the above.

  Moreover, in each said embodiment, although what used the power window motor 10 was shown as a motor apparatus which has a reduction gear, this invention is not restricted to this, The reduction gear which drives a to-be-driven target object directly is shown. The present invention can also be applied to a motor device that is not provided. In this case, the present invention is particularly effective when applied to a motor device in which the rotating shaft can move in the axial direction with respect to the case.

  Further, in each of the above-described embodiments, a part of the bearing-side second cylindrical portion 74 of the thrust bearing 70 is melted by the heating element tool T2 and fixed to the cylindrical housing portion 54 so as not to be relatively rotatable. Although shown, the present invention is not limited to this, and other melting methods such as ultrasonic melting and high-frequency vibration melting can also be used.

  In the first embodiment, as shown in FIG. 2, the outer dimension of the bearing-side first cylindrical portion 73 is set larger than the outer dimension of the male screw portion 72 so as to have a radial dimension difference D. However, the present invention is not limited to this, and if an O-ring having a relatively high durability is used, the outer dimensions of both members can be the same. In this case, the manufacturing process of the thrust bearing 70 can be simplified and the manufacturing cost can be reduced.

  Further, in each of the above-described embodiments, the structure in which the screw thread top portion 72a is screw-coupled by biting into the second screw groove bottom portion 59b is shown, but the present invention is not limited to this, and the thrust bearing 70 and the cylindrical housing By appropriately setting the material for the portion 54, the thread crest portion 72a can be crushed by the second thread groove bottom portion 59b and screwed together. Further, when the thrust bearing 70 is screwed by using an automatic fastening tool or the like having a fixed rotation axis, the thrust bearing 70 can be centered with respect to the cylindrical housing portion 54 by the automatic fastening tool. For example, the second thread groove bottom 59b can be formed in the entire axial direction of the female thread 59 by omitting the function. In this case, the thrust bearing 70 and the cylindrical housing portion 54 can be more firmly fixed.

  Further, in each of the above embodiments, both the thrust bearing 70 and the speed reducer case 51 are formed of a resin material. However, the present invention is not limited to this, for example, the case side is made of aluminum and thrust. The bearing may be made of resin, and conversely, the case side may be made of resin and the thrust bearing may be made of aluminum. In this case, a recess may be formed in the aluminum member, and the resin material member may be melted into the recess.

It is sectional drawing of a power window motor. It is the fragmentary sectional view which expanded the broken-line circle | round | yen A part of FIG. It is the perspective view which expanded the thrust bearing periphery part of FIG. (A), (b) is the C arrow directional view and D arrow directional view of FIG. It is explanatory drawing explaining the assembly procedure of a thrust bearing assembly. It is explanatory drawing explaining the assembly procedure of a reduction gear case assembly. It is explanatory drawing explaining the assembly procedure of a motor part assembly. It is explanatory drawing explaining the assembly procedure of each assembly. It is a fragmentary sectional view corresponding to Drawing 2 in a 2nd embodiment.

Explanation of symbols

10 Power window motor (motor unit, motor unit with reduction gear)
20 Motor part 21 Motor case (case)
21a body portion 21b stepped bottom portion 22 permanent magnet 23 rotor 23a coil 24 armature shaft (rotating shaft)
24a Mounting convex part 25 Radial bearing 26 Thrust bearing 27 Commutator 28 Brush holder 29 Brush 30 Sensor magnet 40 Connector connection part 41 Terminal 42 Hall element 50 Reduction mechanism part 51 Reduction gear case (case)
52 Worm wheel 52a Output shaft 52b Gear teeth 53 Worm shaft (rotary shaft)
53a Worm gear 53b Mounting recess 54 Cylindrical housing 55, 56 Radial bearing 57 Opening (communication hole)
57a, 57b Case side cylindrical part 58 Recessed part 59 Female thread part 59a First thread groove bottom part 59b Second thread groove bottom part 60 Step part 61 O-ring (annular seal)
62 Steel Ball 70 Thrust Bearing 71 Melting Portion 72 Male Thread Portion 72a Screw Thread Top 73 Bearing Side First Cylindrical Portion 74 Bearing Side Second Cylindrical Portion 75 Tool Hole 76 Mounting Recession 77 Thrust Plate 78 Fastening Screw 79 Bearing Side First Cylindrical Portion 81 O-ring (annular seal)
CL clearance GA reduction gear case assembly MA motor assembly RA rotor assembly SA thrust bearing assembly T1 hexagon wrench T2 heating tool

Claims (12)

A motor device having a rotating shaft and a case that rotatably accommodates the rotating shaft,
A communication hole provided in the case, communicating the inner side and the outer side of the case, and having a case side cylindrical portion and a female screw portion formed continuously from the case side cylindrical portion;
A thrust bearing that is screwed into the female screw portion from the outside of the case, supports one end of the rotating shaft, and adjusts a gap between the other end of the rotating shaft and the case;
An annular seal that is mounted on the thrust bearing and seals between the thrust bearing and the communication hole;
The thrust bearing includes a male screw portion screwed into the female screw portion,
A bearing-side first cylindrical portion that is formed continuously with the male screw portion so as to face the case-side cylindrical portion, and on which the annular seal is mounted,
The motor device, wherein the annular seal is sandwiched between the case side cylindrical portion and the bearing side first cylindrical portion. 2. The motor device according to claim 1, wherein the case-side cylindrical portion is provided in the vicinity of the opening of the communication hole in the case, and the female screw portion is provided on a deeper side of the communication hole and than the case-side cylindrical portion. Formed with small inner diameter,
The bearing-side first cylindrical portion is formed to have an outer diameter that is the same as or slightly larger than the outer diameter of the thread crest of the male screw portion,
A motor device, wherein an inner diameter dimension of the annular seal in a natural state is smaller than that of the first cylindrical portion on the bearing side. 2. The motor device according to claim 1, wherein the case-side cylindrical portion is provided on a deeper side of the communication hole in the case, and the female screw portion is provided on an opening side of the communication hole and more than the case-side cylindrical portion. Formed in large outer diameter dimensions,
A motor device, wherein an inner diameter dimension of the annular seal in a natural state is smaller than that of the first cylindrical portion on the bearing side.   The motor device according to any one of claims 1 to 3, wherein an inner diameter dimension of a thread groove bottom portion on at least the hole back side of the case of the female screw portion is larger than an outer diameter size of a screw thread top portion of the male screw portion. A motor device characterized by being made small. 5. The motor device according to claim 1, wherein the thrust bearing further includes a bearing-side second cylindrical portion positioned near the opening of the communication hole,
While forming at least one of the case and the bearing-side second cylindrical portion with a resin material, forming a recess in one of the other, melting one of the resin material into the recess, A motor device, wherein the case and the thrust bearing are fixed.   6. The motor device according to claim 1, wherein a thrust plate that supports one end of the rotating shaft is fixed to a portion of the thrust bearing that faces the one end of the rotating shaft. Motor device. A motor device with a speed reducer comprising: an armature shaft; a motor case that rotatably accommodates the armature shaft; and a speed reducer case that accommodates a worm shaft that rotates integrally with the armature shaft and a worm wheel that meshes with a worm gear of the worm shaft. Because
A communication hole provided in the speed reducer case, communicating the inner side and the outer side of the speed reducer case, and having a case side cylindrical portion and a female thread portion formed continuously from the case side cylindrical portion;
A thrust bearing that is screwed into the female screw portion from the outside of the speed reducer case, supports one end of the worm shaft, and adjusts a gap between the other end of the armature shaft and the motor case;
An annular seal that is mounted on the thrust bearing and seals between the thrust bearing and the communication hole;
The thrust bearing includes a male screw portion screwed into the female screw portion,
A bearing-side first cylindrical portion that is formed continuously with the male screw portion so as to face the case-side cylindrical portion, and on which the annular seal is mounted,
A motor device with a reduction gear, wherein the annular seal is sandwiched between the case-side cylindrical portion and the bearing-side first cylindrical portion. 8. The motor device with a speed reducer according to claim 7, wherein the case side cylindrical portion is provided in the vicinity of the opening of the communication hole in the speed reducer case, and the female screw portion is provided on a deeper side of the communication hole. It is formed with a smaller inner diameter than the side cylindrical part,
The bearing-side first cylindrical portion is formed to have an outer diameter that is the same as or slightly larger than the outer diameter of the thread crest of the male screw portion,
A motor device with a reduction gear, wherein an inner diameter dimension of the annular seal in a natural state is smaller than that of the first cylindrical portion on the bearing side. 8. The motor device with a reduction gear according to claim 7, wherein the case side cylindrical portion is provided on a deep side of the communication hole in the reduction gear case, and the female screw portion is provided on an opening side of the communication hole and the case. It is formed with a larger outer diameter than the side cylindrical part,
A motor device with a reduction gear, wherein an inner diameter dimension of the annular seal in a natural state is smaller than that of the first cylindrical portion on the bearing side.   The motor device with a reduction gear according to any one of claims 7 to 9, wherein an inner diameter dimension of a thread groove bottom portion of at least the inner side of the hole of the reduction gear case of the female screw portion is set to a screw thread top portion of the male screw portion. A motor device with a reduction gear, wherein the motor device is smaller than an outer diameter. The motor device with a reduction gear according to any one of claims 7 to 10, wherein the thrust bearing further includes a bearing-side second cylindrical portion located in the vicinity of the opening of the communication hole,
By forming at least one of the speed reducer case and the second cylindrical portion on the bearing side with a resin material, forming a recess in one of the other, and melting one of the resin materials into the recess A motor device with a speed reducer, wherein the speed reducer case and the thrust bearing are fixed.   The motor device with a reduction gear according to any one of claims 7 to 11, wherein a thrust plate that supports one end of the worm shaft is fixed to a portion of the thrust bearing that faces one end of the worm shaft. A motor device with a reduction gear.

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