JP2007151384A - Geared motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a geared motor in which the quality can be enhanced by enhancing mutual positional precision of spindles. <P>SOLUTION: In the geared motor 1, output side end face 41 of a stator 40 at a motor section 4 is secured to a plate 2, and a rotor spindle receiving portion 24 is extending from the plate 2 to a position opposing the securing part 21 of the stator 40 on the output side. Since a first spindle holding hole 248 for supporting the output side end of a rotor spindle 48 is formed in the rotor spindle receiving portion 24 of the plate 2, and second spindle holding holes 251 and 252 for supporting the anti-output side end of the gear spindles 81 and 82 of gears 51 and 52 and a hole 262 for supporting the anti-output side rotary shaft 62 of the final gear 6 are formed in the plate 2, one end can be held on the plate 2 for the spindle of any one of the rotor spindle 48 and the gear spindle 81 and 82. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a geared motor in which rotation of a motor unit is output via a train wheel.

  In general, a geared motor is configured such that rotation output from a motor unit is transmitted to an output shaft via a train wheel. In such a geared motor, the stator of the motor unit is fixed to the base plate, the case member is opposed to the base plate on the output side of the motor unit, and the gears constituting the train wheel are rotatably supported by the base plate and the case. Each end of the gear support shaft is held. In the motor unit, the rotor support shaft that rotatably supports the geared rotor is configured such that the end on the counter-output side is held by the stator while the end on the output side is held by the case member. .

  Also, when designing a geared motor, if there is a size margin in the motor axis direction of the motor section, but there is no size margin in the plane direction (direction orthogonal to the motor axis line), both sides sandwiching the base plate In many cases, a configuration is adopted in which the train wheel is divided and arranged. In this case, the upper case and the lower case are arranged on both sides of the main plate, both ends of some gear support shafts are held by the main plate and the upper case, and both end portions of other gear support shafts are connected to the main plate and the lower case. The configuration is retained.

  However, conventionally, the stator is fixed to the base plate, but the output side end portion of the rotor support shaft is held by the case member, and both end portions of the gear support shaft are held by the base plate and the case member, respectively. Therefore, the position accuracy between the rotor support shaft and the gear support shaft is directly affected by the position accuracy when the main plate and the case member are opposed to each other. For this reason, there is a problem that the core position accuracy between the gears tends to be low, and the quality of the geared motor is low.

  In particular, when the train wheel is divided and arranged on both sides of the main plate, the positional accuracy between the rotor support shaft and the gear support shaft and the positional accuracy between the gears constituting the train wheel (the core positional accuracy between the gears) Because of the influence of both the positional accuracy between the upper case and the upper case, and the positional accuracy between the base plate and the lower case, there is a problem that the quality tends to be lowered and the quality of the geared motor is likely to deteriorate. In addition, when the base plate, the upper case, and the lower case are used, the number of parts is large, and the labor for assembling increases, resulting in an increase in cost.

  In view of the above problems, an object of the present invention is to provide a geared motor capable of improving the quality by increasing the positional accuracy between the support shafts.

  In order to solve the above-mentioned problems, in the present invention, a rotor is formed on the output shaft by a motor unit rotatably supported on a rotor support shaft, an output shaft, and a rotation of a gear configured in the rotor. In the geared motor having the train wheel that transmits to the final gear, the side of the motor unit that is rotationally output from the rotor to the train wheel is the “output side” and the other side is the “reverse output” in the motor axial direction. When the "side" is selected, a plate is provided to which the output side end face of the stator of the motor unit is fixed. The plate is extended to a position facing the fixed part of the stator on the output side, and the rotor support A plurality of gear support shafts that are formed with a rotor support bearing portion having a first support shaft holding hole for holding the output side of the shaft and that rotatably support a plurality of gears constituting the wheel train. Anti-output Each end portion, and a plurality of second support shaft holding hole for holding is formed.

  In the present invention, the output side end face of the stator of the motor unit is fixed to the plate, and the rotor support bearing part extends to the plate so as to face the fixed part of the stator on the output side. For this reason, while forming the 1st spindle holding hole which supports the output side of a rotor spindle in the rotor support bearing part of a plate, the non-output side edge part of each gear spindle of the some gearwheel which comprises a gear train If the second support shaft holding hole for supporting the shaft is formed in the plate, one end portion of either the support shaft of the rotor support shaft or the gear support shaft can be held on the plate. Therefore, the mutual positional relationship among the motor unit, the rotor, and the train wheel can be defined on the plate. Therefore, when forming the plate having the first support shaft holding hole and the second support shaft holding hole, if the positional accuracy between these support shaft holding holes is increased, the mutual positional relationship between the support shafts. With respect to, high positional accuracy can be obtained without being directly affected by the positional accuracy between the plate and the case member.

  In the present invention, if the first support shaft holding hole of the rotor support bearing portion is on the output side of the rotor support shaft, a configuration in which a part of the first support shaft holding hole is held on the output side of the rotor support shaft can be adopted. A configuration in which the end portion is held can also be adopted.

  In the present invention, a case member that defines a space in which the train wheel is disposed between the plate and the plate is attached to the output side of the plate, and the case member includes the plurality of gear support shafts. It is preferable that a plurality of third support shaft holding holes for holding the output side end portions are formed. If comprised in this way, since all the output side edge parts of a some gear support shaft are hold | maintained by a case member, there exists an advantage that the positional accuracy of these gear support shafts is high.

  In the present invention, the plurality of second support shaft holding holes may adopt a configuration in which formation positions in the motor axial direction on the plate are different from each other. That is, it is possible to adopt a configuration in which the plurality of second support shaft holding holes are formed at different height positions on the plate. If comprised in this way, even when the position in the motor axial direction of the meshing part of a gear is different, it can respond by making the formation position in the motor axial direction of a 2nd spindle holding hole differ on a plate. Therefore, it is possible to support the opposite end portions of all the gear support shafts on the plate, and it is not necessary to support the gear support shaft by other members such as a base plate, so that high positional accuracy can be obtained between the gear support shafts. it can.

  In the present invention, the plurality of second support shaft holding holes are positioned so as to increase from the counter-output side to the output side as viewed from the plate, or the counter-output side as viewed from the plate toward the final gear. The structure formed in the position which becomes low toward the output side can be employ | adopted. That is, the plurality of second support shaft holding holes are sequentially positioned at higher positions on the plate or sequentially at lower positions on the plate as they move from the motor unit to the final gear. The structure formed so that it may be located is employable. With this configuration, even when the position of the gear meshing portion in the motor axial direction is continuously changing, it is possible to cope with the difference in the formation position of the second support shaft holding hole in the motor axial direction on the plate. it can. Therefore, it is possible to support the opposite end portions of all the gear support shafts on the plate, and it is not necessary to support the gear support shaft by other members such as a base plate, so that high positional accuracy can be obtained between the gear support shafts. it can.

  In the present invention, it is possible to adopt a configuration in which the plurality of second support shaft holding holes are arranged in the circumferential direction around a predetermined position from the motor portion toward the final gear. That is, it is possible to employ a configuration in which a plurality of second support shaft holding holes are formed at locations where the height position changes spirally on the plate. If comprised in this way, since a motor part and a train wheel can be arranged in three dimensions, the plane size which a motor part and a train wheel occupy can be reduced.

  In the present invention, when the plate is made of a resin molded product, it is preferable that the first support shaft holding hole and the second support shaft holding hole are formed at the time of resin molding of the plate.

  In the present invention, when the plate is made of a metal plate, it is preferable that the first support shaft holding hole and the second support shaft holding hole are formed by deep drawing on the metal plate.

  In the present invention, when the output shaft and the final gear are connected by fitting a shaft portion formed on one side thereof into a fitting hole formed on the other side, the shaft portion and the fitting The hole is configured to have a cross-sectional shape having a corner at at least one location, for example, a cross-sectional shape such as a polygon, a D-shape, and a + shape. In this case, it is preferable that the corner portion of the fitting hole is recessed outward from the position where the virtual extension lines of both side portions sandwiching the corner portion intersect. Or it is preferable that the said axial part is dented inside rather than the position where the virtual extension line of the both-sides part which pinches | interposes the said corner | angular part cross | intersects. If comprised in this way, a shaft part can be easily fitted in a fitting hole. Further, since no force is concentrated on the corner portion, it is possible to prevent the shaft portion from being deformed or damaged. Furthermore, it is not necessary to cut the corner portion with labor.

  In the present invention, it is preferable that the stator and the plate are fixed by caulking. If comprised in this way, the efficiency of an assembly operation can be improved.

  In the present invention, the first support shaft holding hole for supporting the output side end portion of the rotor support shaft is formed in the rotor support bearing portion of the plate, and the counter output of each gear support shaft of the plurality of gears constituting the gear train is formed. Since the second support shaft holding hole for supporting the side end portion is formed in the plate, one end portion of either the support shaft of the rotor support shaft or the gear support shaft can be held on the plate. Therefore, the mutual positional relationship among the motor unit, the rotor, and the train wheel can be defined on the plate. Therefore, when forming the plate having the first support shaft holding hole and the second support shaft holding hole, if the positional accuracy between these support shaft holding holes is increased, the mutual positional relationship between the support shafts. With respect to, high positional accuracy can be obtained without being directly affected by the positional accuracy between the plate and the case member. Therefore, since the core position accuracy between gears can be improved, the quality of the geared motor can be improved.

  A geared motor to which the present invention is applied will be described with reference to the drawings. In the following description, the side of the motor unit in which the rotation is output in the motor axis direction is referred to as “output side” and the opposite side is referred to as “non-output side”.

[Embodiment 1]
(overall structure)
FIGS. 1A and 1B are a perspective view and an exploded perspective view of a geared motor according to Embodiment 1 of the present invention, respectively. 2 (a) and 2 (b) are respectively a plan view showing a geared motor shown in FIG. 1 with a part cut away, and an explanatory view showing the train wheel along the line AA ′. is there. In FIG. 1B and FIGS. 2A and 2B, the output shaft is not shown.

  As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the geared motor 1 according to the present embodiment is configured so that the rotation output from the motor unit 4 is output from the housing 10. It is a motor which outputs from. The housing 10 includes a plate 2 and a case member 3 facing the plate 2, and lead wires 19 are drawn out from the housing 10. The plate 2 and the case member 3 are fixed by the hook 38 projecting from the outer peripheral edge of the case member 3 toward the plate 2 engaging with the engagement protrusion 28 formed on the side surface of the plate 2. Are formed with connecting portions 31 and 32 to the motor device side on which the geared motor 1 is mounted.

  In the geared motor 1 of this embodiment, the motor unit 4 includes a cylindrical stator 40, a rotor 46 having a rotor magnet 44 inside the stator 40, and a rotor support shaft 48 that rotatably supports the rotor 46. I have. The output-side end face 41 of the stator 40 is fixed to the counter-output-side face of the plate 2 with a plurality of crimping portions 12.

  The rotor support shaft support plate 42 is fixed to the counter output side end surface of the stator 40 by a method such as spot welding, and the counter output side end portion of the rotor support shaft 48 is fitted in the through hole of the rotor support shaft support plate 42. Is retained. Further, the motor unit 4 is covered with a motor cover 43 made of a metal thin plate on the side surface and the opposite output side end surface, and on the bottom surface of the motor cover 43 positioned further on the opposite output side of the rotor support shaft support plate 42. The opposite end of the rotor support shaft 48 abuts.

  On the other hand, on the output side of the stator 40, the plate 2 is formed with a rotor support bearing portion 24 protruding to the output side with a bent portion in the middle, and the rotor support bearing portion 24 is a motor portion in the plate 2. 4 is opposed to the fixed portion 21. Here, the rotor support bearing portion 24 is formed with a first support shaft holding hole 248 that holds the output side end (output side) of the rotor support shaft 48. The rotor 46 is formed as a geared rotor having external teeth 47 formed on the outer peripheral surface.

  The output shaft 9 is inserted up to a middle position of a stepped through hole 60 that penetrates in the motor axial direction in the final gear 6, and can rotate integrally with the final gear 6. That is, in the through hole 60, the cross section of the portion into which the output shaft 9 is inserted (the fitting hole 7) is formed in a substantially regular hexagon, while the cross section of the output shaft 9 is also a substantially regular hexagon.

  However, in this embodiment, the cross-sectional shape of the output shaft 9 is close to a regular hexagon, whereas the corner portion 71 of the fitting hole 7 is more than the position where the virtual extension lines of both side portions 72 that sandwich the corner portion 71 intersect. It is recessed outside along the ridgeline. For this reason, the output shaft 9 can be easily fitted into the fitting hole 7. Further, since no force concentrates on the corner 71, it is possible to prevent the output shaft 9 from being deformed or damaged. Furthermore, it is not necessary to cut the corner portion 71 with labor. Such a configuration is applied when the output shaft 9 and the fitting hole 7 have a cross-sectional shape having a corner at at least one location, for example, a cross-sectional shape such as a polygon, a D-shape, and a + shape. In addition to the configuration in which the corner portion of the fitting hole 7 is recessed outward from the position where the virtual extension lines of both side portions sandwiching the corner portion intersect, the corner portion of the output shaft 9 is You may employ | adopt the structure which is dented inside rather than the position where the virtual extension line of the both-sides part which pinches | interposes this corner | angular part cross | intersects.

  In the geared motor 1 configured as described above, the rotor 46 and the final gear 6 are mechanically connected by a reduction gear mechanism including a wheel train 5 including a first wheel 51 and a second wheel 52. The first wheel 51 includes a large-diameter external gear that meshes with the external teeth 47 of the rotor 46 exposed from the gap of the rotor support bearing portion 24, and a small-diameter external gear that is formed on the output side of the large-diameter external gear. And is rotatably supported by the first gear support shaft 81. The second wheel 52 includes a large-diameter external gear that meshes with the small-diameter external gear of the first wheel 51 and a small-diameter external gear formed on the output side of the large-diameter external gear. The gear support shaft 82 is rotatably supported. Further, the small-diameter external gear of the second wheel 52 is meshed with the external teeth of the final gear 6.

  Here, the gear support shafts 81 and 82 of the first wheel 51 and the second wheel 52 are respectively held in second support shaft holding holes 251 and 252 formed on the plate 2 at the opposite output side ends. Yes. That is, the plate 2 is provided with a second support shaft holding hole 251 that supports the opposite end portion of the gear support shaft 81 of the first wheel & pinion 51 at a position substantially overlapping with the stator 40. A second support shaft holding hole 252 that supports the opposite end portion of the gear support shaft 82 of the second wheel 52 is formed.

  Further, the output side end portions of the gear support shafts 81 and 82 of the first wheel 51 and the second wheel 52 are held in third support shaft holding holes 351 and 352 formed in the case member 3, respectively.

  The both ends of the final gear 6 itself are rotating shafts 61 and 62, and the rotating shaft 62 on the counter-output side is rotatably supported by a rotating shaft support hole 262 formed in the plate 2, and the output side The rotation shaft 61 is rotatably supported by a rotation shaft support hole 362 formed in the case member 3.

  In this way, the external teeth 47, the train wheel 5 and the final gear 6 of the rotor 46 are arranged in a substantially straight line. Here, the meshing portion between the outer teeth 47 of the rotor 46 and the first wheel 51, the meshing portion between the first wheel 51 and the second wheel 52, and the meshing portion between the second wheel 52 and the final gear 6 are respectively motors. Although the formation positions in the axial direction (the height positions when viewed from the plate 2) are different from each other, the two second support shaft holding holes 251 and 252 are formed at substantially the same height positions on the plate 2. The two third support shaft holding holes 351 and 352 are formed at substantially the same height on the case member 3.

  The plate 2 is made of a resin molded product, and the rotation shaft support hole 262, the first support shaft holding hole 248, and the second support shaft holding holes 251 and 252 are formed simultaneously when the plate 2 is resin-molded. . The case member 3 is also made of a resin molded product, and the rotation shaft support hole 362 and the third support shaft holding holes 351 and 352 are formed simultaneously with the case member 3 during resin molding. Therefore, in the plate 2, the rotation shaft support hole 262, the first support shaft holding hole 248, and the second support shaft holding holes 251, 252 have high positional accuracy, and the case member 3 also has the rotation shaft support hole. The positional accuracy of the 362 and the third support shaft holding holes 351 and 352 is high.

(Main effects of this form)
As described above, in the geared motor 1 of this embodiment, the output side end surface 41 of the stator 40 of the motor unit 4 is fixed to the plate 2, but the plate 2 outputs to the fixed portion 21 of the stator 40. The rotor support bearing portion 24 extends to a position facing the side. For this reason, the first support shaft holding hole 248 for supporting the output side end portion (output side) of the rotor support shaft 48 is formed in the rotor support bearing portion 24 of the plate 2, and the gear support shafts of the gears 51 and 52 are provided. Forming on the plate 2 are second support shaft holding holes 251 and 252 that support the opposite output side ends of 81 and 82 and a rotation shaft support hole 262 that supports the rotation shaft 62 on the opposite output side of the final gear 6. Can do. Therefore, one end of each of the rotor support shaft 48 and the gear support shafts 81 and 82 can be held on the plate 2, and the rotation shaft 62 on the opposite output side of the final gear 6 can be held on the plate 2. Since it can hold | maintain, the mutual positional relationship of the motor part 4, the rotor 46, the wheel train 5, and the output shaft 9 on the plate 2 can be prescribed | regulated. Therefore, when forming the plate 2, if the positional accuracy of the first support shaft holding hole 248, the second support shaft holding holes 251, 252, and the rotary shaft support hole 262 is increased, the support shaft 48, About the positional relationship between 81 and 82 and the rotating shaft 62, the influence of the positional accuracy between the plate 2 and the case member 3 is not directly affected, and high positional accuracy can be obtained. That is, since the positional relationship among the motor unit 4, the rotor 46, the train wheel 5 and the final gear 6 can be defined on the plate 2, even if the positional accuracy between the plate 2 and the case member 3 is somewhat low, With respect to the positional relationship between the shafts 48, 81, 82 and the rotating shaft 62, high positional accuracy can be obtained. Therefore, since the core position accuracy between gears can be improved, the quality of the geared motor 1 can be improved.

  In this embodiment, the case member 3 is formed with a plurality of third support shaft holding holes 351 and 352 for holding the output side end portions of the gear support shafts 81 and 82, respectively. The output side end portions 81 and 82 are all held by the case member 3. Therefore, the positional accuracy between the gear support shafts 81 and 82 is also high on the case member 3. In addition, since the rotary shaft support hole 362 for supporting the rotary shaft 61 on the output side of the final gear 6 is also formed in the case member 3, the positional accuracy between the gear support shafts 81 and 82 and the rotary shaft 61 is high.

  Furthermore, in this embodiment, since the motor unit 4 is mounted on the plate 2 side, the case member 3 is formed with the connecting portion 31 with the motor device side, so that the vibration generated in the motor unit 4 is There is an advantage that it is difficult to be transmitted to the motor device via the case member 3.

[Embodiment 2]
(overall structure)
FIGS. 3A, 3B, and 3C are a plan view, a side view, and a bottom view of the geared motor according to the second embodiment of the present invention as viewed from the output side, respectively. 4 (a) and 4 (b) are respectively a cross-sectional view of the geared motor shown in FIG. Since the basic configuration of the geared motor of the present embodiment is the same as that of the first embodiment, the same reference numerals are given to the portions having common functions.

  3 (a), (b), (c) and FIGS. 4 (a), (b), the geared motor 1 of this embodiment is also output from the motor unit 4 as in the first embodiment. The motor outputs rotation from an output shaft 9 protruding from the housing 10. The housing 10 includes a plate 2 and a case member 3 facing the plate 2, and a bottom plate 49 is fixed to the surface of the plate 2 on the side opposite to the output side. The bottom plate 49 and the plate 2 are connected to each other by bolts 15 at two opposite corners. The plate 2 and the case member 3 have hooks 38 protruding from the outer peripheral edge of the case member 3 to the plate 2 side. It is fixed by engaging with an engaging protrusion 28 formed on the side surface. The case member 3 is formed with connecting portions 31 and 32 to the motor device side on which the geared motor 1 is mounted. A lead wire 19 is drawn out from the housing 10.

  In the geared motor 1 of this embodiment, the motor unit 4 includes a cylindrical stator 40, a rotor 46 having a rotor magnet 44 inside the stator 40, and a rotor support shaft 48 that rotatably supports the rotor 46. I have. The output side end surface 41 of the stator 40 is fixed to the surface on the opposite side of the plate 2 via the bottom plate 49.

  A motor cover 451 is fixed to the non-output side end surface of the stator 40 by a method such as spot welding, and the spring property that is press-fitted into the rotor 46 around the non-output side end portion of the rotor support shaft 48. A cylindrical member 452 having an inner diameter is arranged, and a non-output side end portion of the rotor support shaft 48 is fitted into a hole 453 formed in the motor cover 451.

  On the other hand, on the output side of the stator 40, the plate 2 is formed with a rotor support bearing portion 24 protruding to the output side with a bent portion in the middle, and the rotor support bearing portion 24 is a motor portion in the plate 2. 4 is opposed to the fixed portion 21. Here, the rotor support bearing portion 24 is formed with a first support shaft holding hole 248 that holds the output side end (output side) of the rotor support shaft 48. The rotor 46 is formed as a geared rotor having external teeth 47 formed on the outer peripheral surface.

  A final gear 6 is formed on the outer peripheral surface of the output shaft 9, and the rotor 46 and the final gear 6 are formed by a reduction gear mechanism including a wheel train 5 having a first wheel 51 and a second wheel 52. Mechanically connected. The first wheel 51 includes a large-diameter external gear that meshes with the external teeth 47 of the rotor 46 exposed from the gap of the rotor support bearing portion 24, and a small-diameter external gear that is formed on the output side of the large-diameter external gear. And is rotatably supported by the first gear support shaft 81. The second wheel 52 includes a large-diameter external gear that meshes with the small-diameter external gear of the first wheel 51 and a small-diameter external gear formed on the output side of the large-diameter external gear. The gear support shaft 82 is rotatably supported. Further, the small-diameter external gear of the second wheel 52 is meshed with the external teeth of the final gear 6.

  In the wheel train 5 configured as described above, the gear support shafts 81 and 82 of the first wheel 51 and the second wheel 52 have second support shaft holding holes 251 in which the opposite output side end portions are formed in the plate 2. , 252 respectively. That is, the plate 2 is provided with a second support shaft holding hole 251 that supports the opposite end portion of the gear support shaft 81 of the first wheel & pinion 51 at a position substantially overlapping with the stator 40. A second support shaft holding hole 252 that supports the opposite end portion of the gear support shaft 82 of the second wheel 52 is formed.

  Further, the output side end portions of the gear support shafts 81 and 82 of the first wheel 51 and the second wheel 52 are held in third support shaft holding holes 351 and 352 formed in the case member 3, respectively.

  Further, the output shaft 9 itself is a rotation shaft, and the shaft portion 92 protruding from the opposite output side end portion is rotatably supported by a rotation shaft support hole 292 formed in the plate 2. A central portion in the length direction 9 is rotatably supported by a rotation shaft support hole 390 formed in the case member 3.

  In the geared motor 1 configured as described above, the meshing portion of the outer teeth 47 of the rotor 46 and the first wheel 51, the meshing portion of the first wheel 51 and the second wheel 52, and the second wheel 52 and the final gear 6 As shown in FIG. 4 (b), the meshing portions are at different height positions in the motor axial direction, and correspondingly, the second support shaft holding holes 251 and 252 have different heights on the plate 2. It is formed in the position. That is, in this embodiment, the meshing portion of the outer teeth 47 of the rotor 46 and the first wheel 51 are engaged with the meshing portion of the first wheel 51 and the second wheel 52, and the meshing portion of the second wheel 52 and the final gear 6. In comparison, the height position when viewed from the plate 2 is located at a position on the output side (a higher place) with respect to the plate 2 as it goes from the motor unit 4 to the final gear 6 and corresponds to it. In this embodiment, the two second support shaft holding holes 251 and 252 are formed at a higher output side (higher place) on the plate 2 as it goes from the motor unit 4 to the final gear 6. Has been. Moreover, as can be seen from FIG. 4A, the two second spindle holding holes 251 and 252 are circumferentially arranged around the center position of the plate 2. The motor unit 4, the first wheel 51, the second wheel 52 and the final gear 6 are arranged in a spiral shape at the center position of the plate 2.

  Here, the plate 2 is made of a resin molded product, and the rotation shaft support hole 292, the first support shaft holding hole 248, and the second support shaft holding holes 251 and 252 are formed simultaneously when the plate 2 is resin molded. Is. The case member 3 is also made of a resin molded product, and the rotating shaft support hole 390 and the third support shaft holding holes 351 and 352 are formed simultaneously with the case member 3 during resin molding. Therefore, in the plate 2, the rotation shaft support hole 292, the first support shaft holding hole 248, and the second support shaft holding holes 251, 252 have high positional accuracy, and the case member 3 also has the rotation shaft support hole. The positional accuracy of the 390 and the third support shaft holding holes 351 and 352 is high.

(Main effects of this form)
As described above, in the geared motor 1 of this embodiment, the output side end surface 41 of the stator 40 of the motor unit 4 is fixed to the plate 2 as in the first embodiment. A rotor support bearing portion 24 extends to a position facing the fixed portion 21 on the output side. For this reason, the first support shaft holding hole 248 for supporting the output side end portion (output side) of the rotor support shaft 48 is formed in the rotor support bearing portion 24 of the plate 2, and the gear support shafts of the gears 51 and 52 are provided. Forming on the plate 2 are second support shaft holding holes 251 and 252 for supporting the non-output side end portions of 81 and 82 and a rotation shaft support hole 292 for supporting the shaft portion 92 of the output shaft 9 on the non-output side. Can do. Therefore, one end of each of the rotor support shaft 48 and the gear support shafts 81 and 82 can be held on the plate 2, and the shaft portion 92 on the opposite side of the output shaft 9 can be held on the plate 2. Since it can hold | maintain, the mutual positional relationship of the motor part 4, the rotor 46, the wheel train 5, and the output shaft 9 on the plate 2 can be prescribed | regulated. Therefore, when the plate 2 is formed, if the positional accuracy of the first support shaft holding hole 248, the second support shaft holding holes 251, 252, and the rotary shaft support hole 292 is increased, the support shaft 48, The positional relationship between 81 and 82 and the shaft portion 92 is not directly affected by the positional accuracy between the plate 2 and the case member 3, and high positional accuracy can be obtained. That is, since the mutual positional relationship among the motor unit 4, the rotor 46, the train wheel 5 and the output shaft 9 can be defined on the plate 2, even if the positional accuracy between the plate 2 and the case member 3 is somewhat low, As for the positional relationship between the shafts 48, 81, 82 and the shaft portion 92, high positional accuracy can be obtained. Therefore, since the core position accuracy between gears can be improved, the quality of the geared motor 1 can be improved.

  In the present embodiment, the case member 3 is formed with a plurality of third support shaft holding holes 381 and 382 for holding the output side end portions of the gear support shafts 81 and 82, respectively. The output side end portions 81 and 82 are all held by the case member 3. Therefore, the positional accuracy between the gear support shafts 81 and 82 is also high on the case member 3. Moreover, since the rotation shaft support hole 390 for supporting the output shaft 9 is also formed in the case member 3, the positional accuracy between the gear support shafts 81 and 82 and the output shaft 9 is high.

  Furthermore, in this embodiment, the meshing portion of the outer teeth 47 of the rotor 46 and the first wheel 51, the meshing portion of the first wheel 51 and the second wheel 52, and the meshing portion of the second wheel 52 and the final gear 6 are as follows. Corresponding to the height position, the second support shaft holding holes 251 and 252 are formed at different height positions on the plate 2, and the motor unit 4, the first wheel 51, the second wheel 52 and the final gear 6 are The plate 2 is configured to be spirally stacked at the center position. For this reason, the non-output side end portions of all the gear support shafts 81 and 82 can be supported on the plate 2, and it is not necessary to support the gear support shaft by another member such as a ground plate. High positional accuracy can be obtained. Moreover, since the second support shaft holding holes 251 and 252 are formed so that the height position changes spirally around the center position of the plate 2, the motor unit 4, the first wheel 51, and the second wheel The wheel 52 and the final gear 6 are configured to be spirally stacked at the center position of the plate 2. For this reason, since the motor part 4 and the train wheel 5 can be arranged in three dimensions, the plane size occupied by the motor part 4 and the train wheel 5 can be reduced.

[Other embodiments]
In the above embodiment, since both the plate 2 and the case member 3 are made of a resin molded product, the first support shaft holding hole 248, the second support shaft holding holes 251, 252, and the third support shaft holding hole 351, 352 and the like are formed at the same time as the resin molding of the plate 2 and the case member 3, but if the plate 2 or the case member 3 is made of a metal plate, if a support shaft holding hole or the like is simultaneously formed by deep drawing processing on the metal plate. Good.

  In the second embodiment, the second support shaft holding holes 251 and 252 are formed at positions where the second support shaft holding holes 251 and 252 become higher from the counter-output side toward the output side as viewed from the plate 2 toward the final gear 6. However, the meshing portion between the outer teeth 47 of the rotor 46 and the first wheel 51, the meshing portion between the first wheel 51 and the second wheel 52, and the meshing between the second wheel 52 and the final gear 6. Depending on the position of the portion, the second support shaft holding holes 251 and 252 are formed at positions that become lower from the output side to the counter-output side as viewed from the plate 2 as they go from the motor unit 4 to the final gear 6. Other configurations may be adopted.

(A), (b) is the perspective view of the geared motor which concerns on Embodiment 1 of this invention, respectively, and its disassembled perspective view. (A), (b) is the top view which notches and shows a part of geared motor shown in FIG. 1, respectively, and explanatory drawing which expand | deploys the wheel train etc. along the AA 'line. (A), (b), (c) is the top view, side view, and bottom view which looked at the geared motor which concerns on Embodiment 2 of this invention from the output side, respectively. (A), (b) is each explanatory drawing which expand | deploys and shows the cross-sectional view of the geared motor shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Geared motor 2 Plate 3 Case member 4 Motor part 5 Wheel train 6 Final gear 9 Output shaft 24 Rotor support bearing part 40 Stator 41 Stator output side end face 46 Rotor 48 Rotor support shaft 51 1st car 52 2nd car 81, 82 Gear support shaft 248 First support shaft holding holes 251 and 25 Second support shaft holding holes 351 and 352 Third support shaft holding holes

Claims (8)

A geared portion having a motor portion in which a rotor is rotatably supported by a rotor support shaft, an output shaft, and a gear train for transmitting rotation of a gear configured in the rotor to a final gear formed in the output shaft. In the motor
Of the motor axial direction of the motor unit, when the rotation output side from the rotor to the train wheel is the output side, and the other side is the non-output side,
A plate on which an output side end face of the stator of the motor unit is fixed;
The plate has a rotor support bearing portion provided with a first support shaft holding hole that extends to a position facing the fixed portion of the stator on the output side and holds the output side of the rotor support shaft. And a plurality of second support shaft holding holes that respectively hold the opposite ends of the plurality of gear support shafts that rotatably support the plurality of gears constituting the train wheel. Geared motor characterized by   The geared motor according to claim 1, wherein the first support shaft holding hole holds an output side end portion of the rotor support shaft. In Claim 1 or 2, the case member which divides and forms the space where the wheel train is arranged between the plate on the output side to the plate is attached,
The geared motor, wherein the case member is formed with a plurality of third support shaft holding holes that respectively hold output side end portions of the plurality of gear support shafts.   4. The geared motor according to claim 1, wherein the plurality of second support shaft holding holes are formed at different positions in the motor axial direction on the plate. 5.   5. The position of the plurality of second support shaft holding holes according to claim 4, wherein the plurality of second support shaft holding holes are increased from the counter-output side to the output side as viewed from the plate, or counter-output as they go from the motor unit toward the final gear. A geared motor characterized by being formed at a position that decreases from the side toward the output side.   6. The geared motor according to claim 5, wherein the plurality of second support shaft holding holes are arranged in a circumferential direction around a predetermined position from the motor portion toward the final gear. In any one of Claim 1 thru | or 6, the said plate consists of a resin molded product,
The geared motor, wherein the first support shaft holding hole and the second support shaft holding hole are formed during resin molding of the plate. In any one of Claim 1 thru | or 6, the said plate consists of a metal plate,
The geared motor, wherein the first support shaft holding hole and the second support shaft holding hole are formed by deep drawing processing on the metal plate.

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