JP2009180324A - Geared motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a geared motor capable of smoothly driving a driven member even if an integrally rotatable rotary body is formed by connecting a gear and the driven member in the axial direction of the rotational center and a pair of supports for supporting such a rotary body are also formed as a separate support member. <P>SOLUTION: In this geared motor 1, a support plate 37 of a lower case 3 supporting a driving gear 62 on both sides and a first horizontal plate 42 of an upper case 4 are shorter than a separate distance between a lower plate 34 of the lower case 3 supporting the rotary body 90 on both sides and a second horizontal plate 43 of the upper case 4. Thus, since the positional accuracy of the driving gear 62 and the positional accuracy of the lower case 3 and the upper case 4 are high, the driving gear 62 suitably meshes with the driven gear 63. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a geared motor in which a motor and a train wheel are mounted on a support.

In general, a geared motor including a motor and a train wheel on a support is generally arranged on the outside of the support from the rotation shaft of the output gear protruding from the support or from the teeth of the output gear protruding from the support. It transmits to the arranged driven member (refer patent document 1).
JP 2003-343701 A

  In such a geared motor, when the output gear (driven gear) and the driven member are connected in the rotation center axis direction to form a rotating body that can rotate integrally, the support body has both sides in the rotation center axis direction. Since it is necessary to arrange a pair of support portions in the space, the interval between the support portions becomes long. Moreover, in the geared motor, two supports are often combined to form a single support for the purpose of improving the efficiency of the assembly work. In such a case, a pair of support parts for supporting the rotating body Needs to be formed on each of the two supports. For this reason, there is a problem that the position accuracy of the rotating body, that is, the position accuracy of the driven gear in the radial direction is poor and smooth driving cannot be performed.

  In view of the above problems, an object of the present invention is to provide a rotating body that can rotate integrally by connecting a gear and a driven member in the direction of the rotation center axis, and a pair of supports for supporting the rotating body. An object of the present invention is to propose a geared motor capable of smoothly driving a driven member even when the portion is formed on another support member.

  In order to solve the above-described problems, the present invention includes a motor, a drive gear, and a driven gear meshing with the drive gear, the train wheel transmitting the output of the motor to a driven member, the train wheel and the wheel train. In a geared motor having a support on which a motor is mounted, the driven gear and the driven member are rotated in such a manner that the driven member is connected to one side of the driven gear in the direction of the rotation center axis so as to rotate integrally. And the drive-side rotation center axis of the drive gear and the driven-side rotation center axis of the rotation body are arranged in parallel on the support body, and the support body is the drive-side rotation center axis. A first support member that includes a first support portion that supports one end of the first support member, a second support portion that supports one end of the driven-side rotation center shaft, and a first support member that supports the other end of the drive-side rotation center shaft. 3 support parts and said driven side A second support member provided with a fourth support part for supporting the other end of the rotation center shaft, and a separation distance between the first support part and the third support part is determined between the second support part and the fourth support part. It is shorter than the separation distance with the support part.

  In the present invention, since the first support portion and the third support portion that support the drive gear on both sides are close to each other, each of the first support portion and the third support portion is a separate support member (the first support member and the third support member). Even when the second support member is configured, the positional accuracy of the drive gear and the positional accuracy of the first support member and the second support member are high. Therefore, the driven gear and the driven member support the rotating body on both sides in the support body because the driven member is connected to one side of the driven gear to form a rotating body that can rotate integrally. The second support portion and the fourth support portion that are separated from each other and the second support portion and the fourth support portion that support the rotating body on both sides are respectively separate support members (first support member and second support member). Even when configured, the positional accuracy of the driven gear is high. Therefore, the drive gear and the driven gear mesh in a suitable state.

  In the present invention, the first support portion and the third support portion are formed at portions of the first support member and the second support member that face each other with a gap slightly wider than the thickness dimension of the drive gear. It is preferable.

  In the present invention, the driving side rotation center shaft includes a shaft portion protruding from one of the first support member and the second support member, and a shaft portion protruding inward from the other support member. It is preferable that it is comprised from the cylinder part to fit. When configured in this manner, when the shaft portion and the cylindrical portion are fitted, the other is positioned with reference to one, so the first support member and the second support member can be positioned with high accuracy. The drive gear and the driven gear can be meshed in a suitable state.

  In the present invention, it is preferable that the second support portion and the fourth support portion are formed on a plate portion that continuously extends in a direction perpendicular to the rotation center axis of the rotating body in the second support member. . If comprised in this way, the high precision can be acquired in the positional relationship of a 2nd support part and a 4th support part.

  In the present invention, the third support portion is formed on a first support plate portion extending in a direction perpendicular to the rotation center axis of the rotating body in the first support member, and the first support portion is the first support portion. A second support plate that extends in parallel to the first support plate portion from a position opposite to the position where the rotating body is disposed relative to the position where the drive gear is disposed in the support member to a position midway toward the position where the rotating body is disposed. It is preferable to form in the part. Such a configuration is effective when applied to a case where the maximum width dimension of the driven member in the direction orthogonal to the rotation center axis of the rotating body is larger than the outer diameter dimension of the driven gear. That is, when such a configuration is adopted, a wide space can be secured between the drive gear and the first support plate portion, so that a space for rotating the driven member is ensured even when the width of the driven member is large. can do.

  According to the geared motor of the present invention, since the first support portion and the third support portion that support the drive gear on both sides are close to each other, each of the first support portion and the third support portion is a separate support member ( Even when the first support member and the second support member are configured, the positional accuracy of the drive gear and the positional accuracy of the first support member and the second support member are high. Therefore, the driven gear and the driven member support the rotating body on both sides in the support body because the driven member is connected to one side of the driven gear to form a rotating body that can rotate integrally. The second support portion and the fourth support portion that are separated from each other and the second support portion and the fourth support portion that support the rotating body on both sides are respectively separate support members (first support member and second support member). Even when configured, the positional accuracy of the driven gear is high. Therefore, since the driving gear and the driven gear mesh with each other in a suitable state, the driven member can be smoothly driven via the driving gear and the driven gear, and transmission loss from the motor to the driven member is kept low. be able to.

  Embodiments of a geared motor to which the present invention is applied will be described below with reference to the drawings. In the following description, among the X direction, the Y direction, and the Z direction orthogonal to each other, the X direction is the left-right direction, the Y direction is the up-down direction, and the Z direction is the front-back direction. In the following description, among the X directions, the + X direction is the right side, the −X direction is the left side, the Y direction is the + Y direction is the upper side, the −Y direction is the lower side, and the Z direction is the + Z direction. The direction is the front side, and the -Z direction is the rear side.

(overall structure)
1A and 1B are a perspective view and a front view of a geared motor to which the present invention is applied, respectively. 2A and 2B are a perspective view and a front view showing an exploded state of the geared motor to which the present invention is applied, respectively. FIGS. 3A and 3B are a perspective view of the lower case used in the geared motor to which the present invention is applied, as viewed obliquely from above, and a perspective view of the lower case as viewed from diagonally right. FIG. 4 is a perspective view of an upper case used in a geared motor to which the present invention is applied as seen obliquely from below.

  As shown in FIGS. 1 and 2, the geared motor 1 according to the present embodiment is a monitoring device that scans the infrared sensor 95 mounted on the driven member 9 in both the left and right directions over a predetermined angle range, and is a motor composed of a stepping motor. 5, a train wheel 6 that transmits the output of the motor 5 to the driven member 9, and a case 2 (support) on which the train wheel 6 and the motor 5 are mounted. The motor 5 includes a flat cylindrical motor case 51, and the motor case 51 also functions as a stator core. The connector 11 is connected to a terminal block protruding from the side surface of the motor case 51. A hollow output shaft 52 protrudes from the output side end surface of the motor case 51, and a motor pinion 58 is attached to the end surface of the output shaft 52. A support shaft 53 for supporting the motor 5 is inserted into the hollow portion of the output shaft 52, and a leaf spring 59 is attached to the support shaft 53.

  The train wheel 6 includes a transmission gear 61 composed of a composite gear meshed with a motor pinion 58 attached to the output shaft 52 of the motor 5, and a composite gear meshed with a small diameter gear of the transmission gear 61. A drive gear 62 composed of a gear and a driven gear 63 composed of a spur gear meshing with the small-diameter gear 622 of the drive gear 62 are provided. The driven gear 63 is formed with a small cylindrical stopper 635 at a position deviating from the center of rotation. The stopper 635 interferes with the upper case 4 described later and restricts the rotation range of the driven gear 63. In this embodiment, the motor axis L0, the rotation center axis L10 of the transmission gear 61, the rotation center axis L1 of the drive gear 62, and the rotation center axis L2 of the driven gear 63 all extend in the vertical direction and are parallel to each other.

  The driven gear 63 and the driven member 9 constitute a rotating body 90 that can rotate integrally with the driven member 9 connected to one side of the driven gear 63 in the direction of the rotation center axis L2. In the rotator 90, the shaft portion 91 protrudes downward from one side of the rotation center axis L2 (lower side / side of the driven member 9), while the other side of the rotation center axis L2 (upper side / driven gear 63 of the driven gear 63). From the side), the shaft portion 92 protrudes upward.

  In this embodiment, the rotating body 90 rotates around the rotation center axis L2 with the shaft portions 91 and 92 as the rotation center axis, and rotates the infrared sensor 95 mounted on the driven member 9 in both the left and right directions over a predetermined angular range. To do.

  As shown in FIGS. 1, 2, 3, and 4, in the geared motor 1, the case 2 includes a lower case 3 (first support member) made of a horizontally long resin molded product and a horizontally long resin molded product. An upper case 4 (second support member) is provided, and the lower case 3 is covered with the upper case 4 from above. Here, engaging projections 30 a and 30 b are formed on the left and right side surfaces of the lower case 3, while hooks 40 a and 40 b extend downward from the left and right side surfaces of the upper case 4. When the upper case 4 is covered from above, the hooks 40a, 40b are automatically engaged with the engagement protrusions 30a, 30b, and the lower case 3 and the upper case 4 are coupled.

(Schematic configuration of lower case 3)
As shown in FIGS. 1, 2, and 3, the lower case 3 includes a right half 31 that is used as the motor mounting portion 50, and a rectangular frame-like left half where the drive gear 62 and the rotating body 90 are disposed. It consists of and. The right half 31 includes a bottom plate portion 311 (bottom wall) on which the motor 2 is placed, a right wall portion 315 that rises upward from the right end portion of the bottom plate portion 311, and a rear end portion that rises upward from the rear end portion of the bottom plate portion 311. And a wall portion 317.

  The left half of the lower case 4 includes a middle plate portion 32 rising from the left end portion of the bottom plate portion 311, and a lower plate portion 34 (first support plate portion) extending leftward from the lower end side of the middle plate portion 32. A left plate portion 33 rising from the left end portion of the bottom plate portion 311, and an upper frame portion 35 extending rightward from the lower end side of the left plate portion 33 and connected to the upper end portion of the middle plate portion 32. The portion 35 has a shape in which a portion that overlaps the rotating body 90 in the axial direction is greatly cut out. A portion where the upper frame portion 35 and the intermediate plate portion 32 are connected to each other is a support plate portion 37 (second support plate portion), and the support plate portion 37 is directed from the intermediate plate portion 32 to the arrangement position of the rotating body 90. It extends with a short dimension to the middle position. A plate-like rib 38 extending in the front-rear direction with a predetermined width dimension is formed on the lower surface side of the support plate portion 37, and is surrounded by the rear end portion of the plate-like rib 38, the support plate portion 37, and the middle plate portion 32. The connected portion is connected by a connecting plate portion 381.

  A wide portion 343 projecting forward is formed at a central portion in the left-right direction of the lower plate portion 34, and a shaft hole 34 a into which the shaft portion 91 of the rotating body 90 is fitted is formed in the wide portion 343. . A shaft portion 371 smaller than the central hole of the drive gear 62 is formed from above the support plate portion 37.

  Further, a counter plate portion 36 (opposite wall) is formed in the vicinity of the connecting portion between the middle plate portion 32 and the rear wall portion 317 so as to overlap with a part of the bottom plate portion 311. A cylindrical projection 361 is formed on the upper surface of the cylindrical projection 361. The cylindrical projection 361 is fitted in the central hole of the transmission gear 61 and rotatably supports the cylindrical projection 361.

(Schematic configuration of upper case 4)
As shown in FIGS. 1, 2, and 4, the upper case 4 includes a cover portion 41 formed on the right side portion, a first horizontal plate portion 42 extending to the left side from the cover portion 41, and a first horizontal plate. And a second horizontal plate portion 43 extending continuously from the portion 42 to the left side. The cover portion 41 includes an upper wall portion 411, an inclined wall portion 412 that is inclined forward from the upper wall portion 411, and a front wall 414 that extends downward from a lower end portion of the inclined wall portion 412. For this reason, when the upper case 4 is put on the lower case 3, the cover part 41 is put on the right half 31 of the lower case 3 from above. Here, a shaft hole 411 c into which the support shaft 53 inserted in the hollow portion of the output shaft 52 of the motor 5 is formed in the lower surface of the upper wall portion 411. When the upper case 4 is put on the lower case 3, the upper wall portion 411 comes into contact with the leaf spring 59 attached to the support shaft 53 with the support shaft 53 fitted in the shaft hole 411 c, and the motor 5 is counter-output. Energize to the side. Further, a step portion 412a is formed on the lower surface of the upper wall portion 411 to contact the output side end surface of the motor case 51 and press the motor 5 to the opposite output side when the upper case 4 is put on the lower case 3. . A slit-like opening 412b parallel to the front end surface of the step 412a is formed at a position corresponding to the front end surface of the step 412a in the inclined wall portion 412.

  In the upper case 4, a stepped shaft part 411 a that protrudes downward and fits inside the cylindrical protrusion 361 of the lower case 3 is formed on the lower surface of the upper wall part 411. The cylindrical protrusion 361 and the shaft part 411 a are formed. Functions as a rotation center axis for the transmission gear 61.

  A cylindrical projection 421 is formed on the lower surface of the first horizontal plate portion 42 so as to protrude downward and into which the shaft portion 371 of the lower case 3 is fitted. The cylindrical projection 421 is formed in the central hole of the drive gear 62. The drive gear 62 is rotatably supported by fitting. Accordingly, the shaft portion 371 and the cylindrical protrusion 421 function as a rotation center axis for the drive gear 62.

  A cylindrical projection 431 is formed on the lower surface of the second horizontal plate portion 43 so as to protrude downward and into which a shaft portion 92 protruding upward from the rotating body 90 is fitted. From the cylindrical protrusion 431, rib-shaped protrusions 432 and 433 extend in a direction of 90 ° with each other. The rib-shaped protrusions 432 and 433 interfere with the stopper 635 of the driven gear 63 to drive the driven gear 63 and the driven gear. The rotation range of the member 9 and the rotating body 90 is regulated.

(Motor 5 mounting structure)
The lower case 3 and the upper case 4 configured as described above hold the motor 5 as will be described in detail below with reference to FIGS.

  In the right half portion 31 of the lower case 3, the inner surface of the right wall portion 315 and the inner surface of the rear wall portion 317 are arcuate circumferential wall surfaces corresponding to the outer peripheral side surface shape of the motor case 51, and such circumferential wall surfaces A region surrounded by is used as the motor mounting unit 50. Here, in the lower case 3, the counter plate portion 36 protrudes so as to overlap a part of the bottom plate portion 311, but the front side of the lower case 3 is in an open state, and the front side of the motor case 51 is connected to the motor case 51. When inserting into the motor mounting part 50 from the direction orthogonal to the axis L0, it is used as the motor insertion port 310.

  In the motor mounting portion 50 configured as described above, a tongue extending in the direction parallel to the motor axis L0 from the bottom plate portion 311 upward to the inside of the portion near the right end of the rear wall portion 317. A piece-like protrusion 318 (first elastic support portion) is formed. Here, a gap 318a is formed between the tongue-like projection 318 and the rear wall 317, and the upper end side of the tongue-like projection 318 is a free end. For this reason, the upper end side of the tongue-like projection 318 can be elastically deformed backward when pressed backward.

  Further, on the inner side of the portion near the left end of the rear wall portion 317, a tongue-like projection 319 (first elastic support) extending upward from the bottom plate portion 311 and extending in the longitudinal direction in a direction parallel to the motor axis L0. Part) is formed. Here, a gap 319a is formed between the tongue-like projection 319 and the rear wall 317, and the upper end side of the tongue-like projection 319 is a free end. For this reason, the upper end side of the tongue-like protrusion 319 can be elastically deformed backward when pressed backward. In addition, although the opposing board part 36 is formed above the standing position of the tongue-like protrusion 319, the part which overlaps with the tongue-like protrusion 319 in the opposing board part 36 is the opening part 36a. For this reason, even when the tongue-like projection 319 is added to the lower case 3, when the mold is formed on the lower case 3, the tongue-like projection 319 can be removed from the lower case 3 from inside the mold. The lower case 3 can be manufactured by molding.

  On the other hand, in the upper case 4, a recess 44 is formed on the lower surface of the cover portion 41 to secure the arrangement position of the motor pinion 58, and the recess 44 is open toward the rear of the upper case 4. It is in.

  Here, at the portion near the right end of the concave portion 44, a tongue-like projection 418 (second elastic support portion) extending from the upper wall portion 411 downward and extending in the longitudinal direction in a direction parallel to the motor axis L0. Is formed. Here, a gap 418a is formed between the tongue-like projection 418 and the peripheral wall 45 of the recess 44, and the lower end side of the tongue-like projection 418 is a free end. For this reason, the lower end side of the tongue-like protrusion 418 can be elastically deformed forward when pressed forward.

  Further, at the portion near the left end of the recess 44, a tongue-like projection 419 (second elastic support portion) extending from the upper wall portion 411 downward in the longitudinal direction in a direction parallel to the motor axis L0 is formed. Has been. Here, a gap 419a is formed between the tongue-like projection 419 and the peripheral wall 45 of the recess 44, and the lower end of the tongue-like projection 419 is a free end. For this reason, the lower end side of the tongue-like projection 419 can be elastically deformed forward when pressed forward.

(Motor mounting structure and gear support structure)
In order to assemble the geared motor 1 having such a configuration, first, the motor case 51 is inserted into the lower case 3 before being joined from the motor insertion opening 310 opened on the front surface.

  Next, when the upper case 4 is put on the lower case 3 so as to cover the motor 5, the hooks 40a, 40b are automatically engaged with the engaging protrusions 30a, 30b, and the lower case 3 and the upper case 4 are brought into contact with each other. Combined. At that time, the step 412 a of the upper case 4 abuts against the output side end surface of the motor case 51 and presses the motor case 51 toward the lower case 3. As a result, the bottom plate portion 311 of the lower case 3 is brought into contact with the non-output side end surface of the motor case 51, and the position of the motor 5 in the motor axial direction is defined. The front side of the outer peripheral side surface of the motor case 51 is elastically pressed backward by the tongue-like projections 418 and 419 of the upper case 4. As a result, the outer peripheral side surface of the motor case 51 is pressed against the tongue-like projections 318 and 319 of the lower case 3 to fix the motor 5. The motor insertion port 310 is blocked by the upper case 4 by portions where the tongue-like projections 318 and 319 are formed.

  When this assembly is performed, the drive gear 62 is supported between the lower case 3 and the upper case 4 with the shaft portion 371 and the cylindrical protrusion 421 as the drive side rotation center axis. The rotating body 90 is supported between the lower case 3 and the upper case 4 with the shaft portions 91 and 92 as the driven side rotation center axis. In this state, the support plate portion 37 of the lower case 3 and the first horizontal plate portion 42 of the upper case 4 face each other with a gap slightly wider than the thickness dimension of the drive gear 62.

(Main effects on gear support structure)
In such a structure, in the lower case 3, the support plate portion 37 in which the shaft portion 371 is formed functions as the first support portion 71 that supports one end of the drive side rotation center shaft, and is formed in the lower plate portion 34. The formed shaft hole 34a functions as a second support portion 72 that supports one end of the driven side rotation center shaft. Further, in the upper case 4, the first horizontal plate portion 42 on which the cylindrical protrusion 421 is formed functions as a third support portion 73 that supports the other end of the drive side rotation center axis, and the cylindrical protrusion 431 is formed. The second horizontal plate portion 43 functions as a fourth support portion 74 that supports the other end of the driven side rotation center shaft.

  Here, the separation distance between the first support part 71 and the third support part 73 is considerably shorter than the separation distance between the second support part 72 and the fourth support part 74. For this reason, since the first support part 71 and the third support part 73 that support the drive gear 62 on both sides are close to each other, each of the first support part 71 and the third support part 73 has a separate support member (lower Even in the case of the case 3 and the upper case 4), the positional accuracy of the drive gear 62 and the positional accuracy of the lower case 3 and the upper case 4 are high. Accordingly, the driven gear 63 and the driven member 9 are connected to the driven gear 9 on one side of the driven gear 63 to form a rotating body 90 that can rotate integrally. The second support portion 72 and the fourth support portion 74 that are supported on both sides are largely separated from each other, and the second support portion 72 and the fourth support portion 74 that support the rotating body 90 on both sides are respectively provided with different support members (lower Even in the case of the case 3 and the upper case 4), the positional accuracy of the driven gear 63 is high. Therefore, since the driving gear 62 and the driven gear 63 mesh with each other in a suitable state, the driven member 9 can be driven smoothly, and transmission loss from the motor 5 to the driven member 9 can be kept low. .

  Further, the drive side rotation center shaft has a structure in which the shaft portion 371 is fitted to the cylindrical protrusion 421, so that the other is positioned with respect to one of the lower case 3 and the upper case 4. Therefore, since the lower case 3 and the upper case 4 can be positioned with high accuracy, the drive gear 62 and the driven gear 63 can be meshed in a suitable state.

  In addition, since the transmission gear 61 has the same structure as that of the drive gear 62, the above-described effect is more remarkable.

  Further, the third support portion 73 and the fourth support portion 74 are plate portions (first horizontal plate portion 42 and second horizontal plate portion) that continuously extend in a direction orthogonal to the rotation center axis L2 of the rotating body 90 in the upper case 4. Since it is formed in the plate part 43), it is possible to obtain high accuracy in the positional relationship between the third support part 73 and the fourth support part 74.

  Furthermore, the second support portion 72 is formed on the lower plate portion 34 (first support plate portion) extending in the direction perpendicular to the rotation center axis L2 of the rotating body 90 in the lower case 3, and the first support portion 71 is In the lower case 3, the support plate portion 37 that extends in parallel to the lower plate portion 34 from the position opposite to the position where the rotating body 90 is disposed to the position where the rotating body 90 is disposed toward the position where the rotating body 90 is disposed. Since it is formed on the (second support plate portion), a wide space can be secured between the drive gear 62 and the lower plate portion 34. Therefore, even when the width dimension of the driven member 9 is larger than the diameter of the driven gear 63, a space for rotating the driven member 9 can be secured.

(Main effects related to the mounting structure of the motor 5)
Further, in this embodiment, a structure in which the outer peripheral side surface of the motor case 51 is elastically sandwiched between the tongue-like projections 418 and 419 of the upper case 4 and the tongue-like projections 318 and 319 of the lower case 3 is adopted. . In addition, the tongue-like protrusions 418 and 419 and the tongue-like protrusions 318 and 319 are formed at opposite positions across the motor axis L0. For this reason, it is possible to prevent the motor 5 from being inclined. Therefore, since the state in which the motor pinion 58 and the transmission gear 61 are suitably meshed can be maintained, the occurrence of problems such as locking can be prevented. Further, since the motor case 51 of the motor 5 is elastically supported by the tongue-like protrusions 318, 319, 418, and 419 while the motor 5 is operating, there is no backlash, so that the generation of vibration noise is prevented. You can also.

  Further, the tongue-like projections 318, 319, 418, 419 extend in the longitudinal direction in a direction parallel to the motor axis L0 and have a short circumferential width dimension. For this reason, the tongue-like projections 318, 319, 418, and 419 are surely brought into contact with an optimal location in the circumferential direction of the motor case 51. Accordingly, even when a configuration in which the plurality of tongue-like projections 318, 319, 418, 419 are elastically contacted with the motor case 51 is adopted, the balance of the force applied to the motor case 51 can be optimized. 51 can be reliably prevented from tilting. Moreover, if comprised in this way, the structure with which the lower case 3 and the upper case 4 were couple | bonded in the state which mutually overlap | superposed in the motor axis L0 direction is employable. That is, when the tongue-like projections 318, 319, 418, 419 extend in the longitudinal direction in a direction parallel to the motor axis L0, the upper case 4 is mounted on the motor axis L0 with the motor 5 mounted on the lower case 3. Even if it covers from the side, the tongue-like projections 418 and 419 are not caught by the motor case 51, and the lower case 3 and the upper case 4 can be smoothly overlapped.

  Further, when the step 412 a of the upper case 4 abuts on the output side end surface of the motor case 51 and the motor case 51 is pressed toward the bottom plate portion 311 of the lower case 3, the bottom plate portion 311 of the lower case 3 in the lower case 3. Is in contact with the non-output side end face of the motor case 51. Thus, the position of the motor 5 in the motor axial direction is defined. For this reason, the motor is held with high positional accuracy in the axial direction by one support member (lower case 3). Even in such a configuration, since the motor insertion port 310 is opened in the lower case 3 in a direction orthogonal to the motor axis L0, there is no hindrance to the insertion of the motor 5. Further, since the motor insertion port 310 is closed at the portion where the tongue-like projections 418 and 419 are formed when the upper case 4 is covered, the motor 5 does not drop off or rattle. In addition, since the transmission gear 61 is supported by the counter plate portion 36 of the lower case 3, both the axial holding of the motor 5 and the transmission gear 61 can be performed using the counter plate portion 36. Therefore, the motor pinion 57 and the transmission gear 61 can be suitably meshed, and such a suitable meshing state can be maintained. Further, there is an advantage that it is not necessary to separately provide a support portion for the transmission gear 61.

(A), (b) is the perspective view and front view of a geared motor to which this invention is applied, respectively. (A), (b) is the perspective view which shows a mode that the geared motor which applied this invention was decomposed | disassembled, respectively, and its front view. (A), (b) is the perspective view which looked at the lower case used for the geared motor to which this invention was applied from diagonally upward, and the perspective view which looked at the lower case from diagonally right, respectively. It is the perspective view which looked at the upper case used for the geared motor to which this invention was applied from diagonally downward.

Explanation of symbols

1 Geared motor 2 Case (support)
3 Lower case (first support member)
4 Upper case (second support member)
5 motor 6 train wheel 9 driven member 50 motor mounting portion 51 motor case 61 transmission gear 62 drive gear 63 driven gear 71 first support portion 72 second support portion 73 third support portion 74 fourth support portion 90 rotating body 310 motor Insertion opening 318, 319 Tongue piece projection (first elastic support part)
418, 419 tongue-like projection (second elastic support portion)

Claims (6)

In a geared motor including a motor, a drive gear and a driven gear meshing with the drive gear, the train wheel transmitting the output of the motor to a driven member, and a support body on which the train wheel and the motor are mounted ,
The driven gear and the driven member constitute a rotating body that is integrally rotatable with the driven member connected to one side of the driven gear in the direction of the rotation center axis, and the driving side of the driving gear The rotation center axis and the driven side rotation center axis of the rotating body are arranged in parallel on the support,
The support includes a first support member that includes a first support portion that supports one end of the drive-side rotation center shaft, a second support portion that supports one end of the driven-side rotation center shaft, and the drive A second support member including a third support portion that supports the other end of the side rotation center shaft, and a fourth support portion that supports the other end of the driven side rotation center shaft;
The geared motor, wherein a separation distance between the first support part and the third support part is shorter than a separation distance between the second support part and the fourth support part.   The first support portion and the third support portion are formed at portions of the first support member and the second support member that are opposed to each other with a gap slightly wider than the thickness dimension of the drive gear. The geared motor according to claim 1, wherein:   The drive-side rotation center shaft includes a shaft portion that protrudes from one of the first support member and the second support member, and a cylindrical portion that protrudes from the other support member and into which the shaft portion fits inside. The geared motor according to claim 1, wherein the geared motor is configured from the following.   The said 2nd support part and the said 4th support part are formed in the board part extended continuously in the direction orthogonal to the rotation center axis line of the said rotary body in the said 2nd support member. The geared motor according to any one of 1 to 3. The second support portion is formed on a first support plate portion extending in a direction orthogonal to the rotation center axis of the rotating body in the first support member,
In the first support member, the first support member extends from a position opposite to the position where the rotating body is disposed to a position where the driving gear is disposed, to a position halfway toward the position where the rotating body is disposed. The geared motor according to any one of claims 1 to 4, wherein the geared motor is formed on a second support plate portion extending in parallel with the portion.   6. The geared motor according to claim 5, wherein a maximum width dimension of the driven member in a direction orthogonal to the rotation center axis of the rotating body is larger than an outer diameter dimension of the driven gear.

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