JP2009201277A - Electric motor with speed reduction mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate a work of attaching a cover to a speed reducer case by enabling to visually recognize a connection portion between a terminal plate and the speed reducer case in attaching the cover to the speed reducer case. <P>SOLUTION: A gear case 31 fixed on a motor body and housing a worm gear mechanism is formed of an aluminum alloy, and a cover 41 with an engaging groove 41a is attached on the outer circumferential edge thereof and closed. A control substrate 42 for controlling the operation of the motor body is attached on the inner surface of the cover 41, and a terminal plate 51 provided with a substrate side connection portion 53 connected to the control substrate 42 is fixed on the cover 41. A case side connection portion 54 to be bent like U-shape is provided on the terminal plate 51, and the chip of the case side connection portion 54 is disposed on a housing recess 41b communicating to an engaging groove 41a. A connection recess 61 is provided on the gear case 31 so that the case side connection portion 54 is embedded in the connection recess 61 when the cover 41 is attached on the gear case 31. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric motor with a speed reduction mechanism used as a drive source for a wiper device for a vehicle, for example.

  As a drive source for a vehicle wiper device, a power window device, or the like, an electric motor with a speed reduction mechanism is used as a unit by attaching a speed reduction mechanism to a motor body having an armature shaft. In such an electric motor with a speed reduction mechanism, a bathtub-shaped speed reducer case is fixed to the yoke of the motor body, and the speed reduction mechanism is accommodated inside the speed reducer case. In addition, a cover is attached to the opening end of the speed reducer case, and the speed reducer case is closed by this cover.

  On the other hand, a so-called electromechanically integrated electric motor with a reduction mechanism is known in which a control board for controlling the operation of the motor body is accommodated in a reduction gear case. In this case, the control board is attached to the inner surface (back surface) of the cover, and is accommodated in the case by attaching the cover to the speed reducer case.

  When such an electromechanically integrated motor is arranged in a panel of the vehicle body, the control board may malfunction due to the influence of noise from other electrical components mounted in the panel. Therefore, in the electromechanical integrated motor, measures are taken to suppress the influence of noise on the control board.

For example, Patent Document 1 discloses that a reduction gear case is formed of a conductor such as an aluminum alloy, and a power supply circuit provided on a control board is grounded to the reduction gear case using a terminal plate, thereby providing a noise shielding effect on the reduction gear case. An electric motor with a speed reduction mechanism that reduces the malfunction of the control board by generating the control board is described.
JP-T-2001-515626

  In the electric motor with a speed reduction mechanism shown in Patent Document 1, the terminal plate is attached to the cover, and is electrically connected to the control board at one end and protrudes toward the speed reducer case at the other end. A case-side connecting portion having a shape is provided. When the cover is attached to the speed reducer case, the case side connection portion is fitted into a connection recess provided integrally with the speed reducer case so that the control board is grounded to the speed reducer case. .

  However, in the case shown in Patent Document 1, since the connection recess connected to the terminal plate is provided on the inner side of the side wall of the reduction gear case and away from the side wall, the terminal plate is attached when the cover is attached to the reduction gear case. It is difficult to visually check the connecting portion between the connecting recess and the connecting recess. Therefore, in order to securely connect the terminal plate to the connection concave portion, it is necessary to attach the cover while accurately positioning the cover with respect to the speed reducer case.

  An object of the present invention is to make it possible to visually check a connection portion between a terminal plate and a speed reducer case when the cover is attached to the speed reducer case, and to facilitate the work of attaching the cover to the speed reducer case.

  An electric motor with a speed reduction mechanism according to the present invention is an electric motor with a speed reduction mechanism including a motor main body having an armature shaft and a speed reduction mechanism for decelerating the rotation of the armature shaft and outputting from the output shaft. A reduction gear case that is formed in a shape and is formed in a bathtub shape having a bottom wall and a side wall by a conductor, and that is fixed to the yoke and accommodates the reduction mechanism, An outer peripheral edge is provided with an engagement groove over the entire circumference, and the motor is attached to the inner surface of the cover, the cover closing the reduction gear case by engaging the engagement groove with the opening side end of the side wall, and the motor A control board that controls the operation of the main body, a connection wall that is arranged on the inside of the side wall and is provided integrally with the speed reducer case, and that forms a connection recess by the side wall and the bottom wall, and electrically connected to the control board Connected A board-side connecting portion, a fixing portion formed integrally with the board-side connecting portion and fixed to the cover, and a receiving recess formed integrally with the fixing portion in a U shape and having a leading end connected to the engaging groove. And a terminal plate having a case side connection portion that is disposed in the connection recess when the cover is attached to the speed reducer case.

  The electric motor with a speed reduction mechanism of the present invention is formed by bending the fixed portion into a U-shape, and the width of one piece connected to the board side connection portion of the fixed portion is the other piece connected to the case side connection portion. The terminal is provided with a pair of mounting grooves having a width dimension corresponding to each piece of the fixing portion, and the terminal is engaged with the corresponding mounting groove. A plate is attached to the cover.

  In the electric motor with a speed reduction mechanism according to the present invention, the height of the connection wall from the bottom wall is lower than the height of the side wall from the bottom wall, and the top of the connection wall faces the connection recess. An inclined surface that is inclined is formed.

  The electric motor with a speed reduction mechanism according to the present invention is characterized in that the case side connection portion is fitted into the connection recess in an elastically deformed state.

  According to the present invention, since the tip of the case side connection portion of the terminal plate is disposed in the receiving recess connected to the engagement groove of the cover, the terminal plate is connected to the reduction gear case when the cover is attached to the reduction gear case. It is possible to easily confirm the state of being performed. This facilitates the work of attaching the cover to the speed reducer case. Further, when the cover is attached to the speed reducer case, the case side connection portion of the terminal plate is fitted into the connection recess provided in the speed reducer case, so that the terminal plate can be reliably connected to the speed reducer case.

  According to the present invention, the fixed portion of the terminal plate to the cover is bent in a U-shape, and the width dimension of one piece connected to the board side connection portion is different from the width dimension of the other piece connected to the case side connection portion. In addition, a pair of mounting grooves having a width corresponding to each piece is provided in the cover, and the terminal plate is attached to the cover by engaging each piece of the fixing portion with the corresponding mounting groove. As a structure in which the terminal plate cannot be mounted in the reverse direction with respect to the normal mounting direction, it is possible to prevent erroneous assembly of the terminal plate with respect to the cover.

  According to the present invention, the height of the connection wall provided in the reduction gear case is formed lower than the height of the side wall, and the inclined surface that is inclined toward the connection recess is provided at the top of the connection wall. The case-side connection portion is first guided by the side wall, and then guided to the connection recess by the inclined surface, so that the case-side connection portion can be securely fitted in the connection recess.

  According to the present invention, since the case side connection portion is elastically deformed and is fitted into the connection recess, even if the terminal plate or the connection recess has a dimensional error, the error of the case side connection portion is reduced. Absorbing by elastic deformation, the case side connection portion can be reliably connected to the reduction gear case at the connection recess.

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

  FIG. 1 is a perspective view showing a wiper motor according to an embodiment of the present invention, and FIG. 2 is a sectional view showing an internal structure of the wiper motor shown in FIG.

  A wiper motor 11 shown in FIG. 1 is used as a drive source of a vehicle wiper device (not shown), and is an electric motor with a speed reduction mechanism including a motor body 12 and a speed reducer 13.

  The motor main body 12 is a DC motor with a brush, and as shown in FIG. 2, a yoke (junction) 14 formed of a steel plate into a bottomed cylindrical shape (cylindrical shape with a bottom) and an armature housed in the yoke 14 (Armature) 15. The amateur 15 includes an amateur shaft 16. The amateur shaft 16 is rotatably supported on the yoke 14 via a bearing 17, so that the amateur 15 is rotatable inside the yoke 14.

  A pair of magnets 18a and 18b are fixed to the inner surface of the yoke 14 with different magnetic poles facing each other, and a magnetic field is formed inside the yoke 14 by these magnets 18a and 18b. An armature core (iron core) 21 is fixed to the armature shaft 16 so as to be positioned inside the magnets 18a and 18b, and a plurality of armature coils (windings) 22 are wound around the armature core 21. A commutator (commutator) 23 is fixed to the armature shaft 16 adjacent to the armature core 21 on the speed reducer 13 side, and the coil ends of the armature coils 22 are respectively connected to corresponding segment pieces of the commutator 23. Electrically connected.

  In order to supply a driving current to the amateur coil 22, a pair of brushes 24 are provided on the motor body 12. These brushes 24 are respectively supported by a brush holder 25 and are in sliding contact with the outer peripheral surface of the commutator 23 from the outside in the radial direction while being urged by a spring 26. When a driving current is supplied to each brush 24, the driving current commutated at a predetermined timing is supplied to each armature coil 22 via the commutator 23, whereby the armature shaft 16 rotates.

  On the other hand, the speed reducer 13 includes a gear case 31 as a speed reducer case, and a worm gear mechanism 32 as a speed reduction mechanism is accommodated in the gear case 31.

  The gear case 31 is formed in a bathtub shape having a bottom wall 31a and a side wall 31b by an aluminum alloy as a conductor, and a yoke 14 is formed by a fastening member (bolt) 33 at a boss portion 31c provided integrally with the side wall 31b. It is fixed to the open end of. The amateur shaft 16 protrudes from the inside of the yoke 14 into the gear case 31, and an intermediate portion and a tip portion thereof are supported by bearings 34 and 35 so as to be rotatable inside the gear case 31.

  The worm gear mechanism 32 includes a worm 32a and a worm wheel 32b that meshes with the worm 32a. The worm 32a is integrally formed on the outer peripheral surface of the portion of the armature shaft 16 that is accommodated in the gear case 31. An output shaft 36 is rotatably supported on the gear case 31, and the worm wheel 32 b is fixed to the output shaft 36 at the axis. As a result, when the motor body 12 is actuated and the armature shaft 16 is rotated, the rotation is decelerated to a predetermined number of rotations via the worm 32a and the worm wheel 32b and output from the output shaft 36. Yes.

  The tip of the output shaft 36 protrudes to the outside of the gear case 31, and a link mechanism (not shown) of the wiper device is connected to the tip of the output shaft 36, and the output of the wiper motor 11 is transmitted to the wiper arm (not shown) via the link mechanism. Communicated.

  A cover 41 is attached to the gear case 31 in order to close the opening.

  FIG. 3 is a view of the cover shown in FIG. 1 as viewed from the inner surface side. The cover 41 is made of resin, and an engagement groove 41a is continuously provided on the outer periphery of the cover 41 over the entire periphery. It has been. The engagement groove 41a is open in the closing direction, that is, in the direction in which the cover 41 is attached to the gear case 31, and when the cover 41 is attached to the gear case 31, as shown in FIG. The opening-side end portion of 31b is inserted into and engaged with the engagement groove 41a over the entire circumference, whereby the gear case 31 is closed by the cover 41.

  Note that a sealing member may be disposed inside the engagement groove 41a to increase the degree of sealing of the gear case 31 by the cover 41.

  As shown in FIG. 2, a control board 42 for controlling the operation of the motor body 12 is attached to the inner surface (back surface) of the cover 41. The control board 42 has a function as a microcomputer in which a plurality of electronic components such as a CPU, a memory, and an FET are mounted on the board. When the cover 41 is attached to the gear case 31, power is supplied. The brushes 24 and 24 are electrically connected via terminals 43a and 43b. The cover 41 is provided with an external connector 44, and the control board 42 is connected to a wiper switch and a battery (power source) (not shown) via the external connector 44. When the wiper switch is operated, the operation signal is input to the control board 42 via the external connector 44, and a drive current corresponding to the input operation signal is supplied from the control board 42 to the motor body 12 to control its operation. Is done.

  A hall sensor (hall element) 46 is mounted on the control board 42 so as to face a sensor magnet (multipolar magnetized magnet) 45 fixed to the armature shaft 16. When the amateur shaft 16 rotates, a pulse signal having a period inversely proportional to the rotation speed is output from the Hall sensor 46, and the control board 42 recognizes the rotation speed of the amateur shaft 16 based on the period of the pulse signal, and uses this as a motor. It is used for operation control of the main body 12.

  Reference numeral 47 denotes a partition member attached to the cover in order to isolate the control board 42 from the worm gear mechanism 32 inside the gear case 31.

  FIG. 4 is a cross-sectional view showing a grounding structure of the control board to the gear case by the terminal board.

  In the wiper motor 11, the gear case 31 is formed of an aluminum alloy as a conductor, and a power supply circuit (not shown) on the negative side of the control board 42 is electrically connected to the gear case 31, that is, grounded using the terminal plate 51. Thus, the gear case 31 has a noise shielding effect (shielding effect) to prevent malfunction of the control board 42 due to noise from the outside.

  5 is a perspective view showing details of the terminal plate shown in FIG. 4, FIG. 6 is a cross-sectional view showing a structure for attaching the terminal plate shown in FIG. 5 to the cover, and FIG. 7 is a line AA in FIG. FIG.

  The terminal plate 51 is formed by bending a conductive plate material such as a copper plate punched into a predetermined shape by a pressing device or the like, and as shown in FIG. 5, a fixed portion 52 formed integrally with each other. And a board-side connecting portion 53 and a case-side connecting portion 54.

  The fixing portion 52 is a portion that becomes a fixing portion of the terminal plate 51 to the cover 41, and has a U-shape including a pair of fixing pieces 52a and 52b and a connecting piece 52c that connects the fixing pieces 52a and 52b. It is formed by bending. As shown in FIG. 5, the width dimension W <b> 1 on the side of the connecting piece 52 c of the one fixed piece 52 a that is connected to the board side connecting portion 53 of the fixing portion 52 is the other piece that is connected to the case side connecting portion 54 of the fixing portion 52. That is, it is set to be smaller than the width dimension W2 on the side of the connecting piece 52c of the other fixed piece 52b, and the connecting piece 52c is formed to be narrower than these fixed pieces 52a and 52b.

  On the other hand, in order to fix the terminal plate 51, the cover 41 is provided with a pair of attachment grooves 55a and 55b extending in the direction in which the cover 41 is attached to the gear case 31. As shown in FIG. 7, one mounting groove 55 a provided on the inner side of the cover 41 is formed to have a width corresponding to the width W1 of the one fixing piece 52 a of the fixing portion 52 of the terminal plate 51, and the outer periphery of the cover 41. The other mounting groove 55b provided on the edge side is formed to have a width corresponding to the width W2 of the other fixing piece 52b of the fixing portion 52 of the terminal plate 51, and the terminal plate 51 corresponds to the one fixing piece 52a. By engaging the mounting groove 55a having the width dimension and engaging the other fixing piece 52b with the mounting groove 55b having the corresponding width dimension, the case-side connecting portion 54 of the fixing portion 52 is covered toward the outer peripheral edge. 41 is attached.

  As described above, in the wiper motor 11, the width dimensions W1 and W2 of the fixing pieces 52a and 52b of the fixing portion 52 of the terminal plate 51 are made different, and the widths of the mounting grooves 55a and 55b on the cover 41 side corresponding to this. Since the dimensions are made different, the terminal plate 51 can be prevented from being assembled to the cover 41 with the assembly direction reversed. This also facilitates the work of attaching the terminal plate 51 to the cover 41.

  As shown in FIG. 5, the board-side connecting portion 53 connected to the fixed piece 52a of the terminal plate 51 is formed in a linear shape, and is parallel to the fixed piece 52a from a position biased to one side of the distal end portion of the fixed piece 52a. Protruding. As shown in FIG. 6, a part of the control board 42 attached to the cover 41 is disposed above the one attachment groove 55 a, and the board-side connection portion 53 of the terminal board 51 is provided on the control board 42. It is inserted into the connection hole 42a and electrically connected to a power supply circuit on the negative electrode side (not shown) provided on the control board 42 by solder.

  The case-side connecting portion 54 is formed by bending a portion of the terminal plate 51 ahead of the fixed piece 52b. The outer guide piece 54c is U-shaped. The cover 41 is provided with an accommodation recess 41b that is continuous with the engagement groove 41a and extends to the inside of the cover 41 with respect to the engagement groove 41a, and the distal end of the outer guide piece 54c of the case side connection portion 54 is the accommodation recess 41b. Is placed inside. That is, as shown in FIG. 6, the case-side connection portion 54 covers the convex wall 41 c of the cover 41 that forms the housing concave portion 41 b by arranging the tip of the outer guide piece 54 c inside the housing concave portion 41 b. It is designed to straddle from the inside to the outside.

  The inner guide piece 54a of the case-side connecting portion 54 is inclined at a predetermined angle toward the inner side of the cover 41 with respect to the fixed piece 52b, and the outer guide piece 54c is also in the same direction as the inner guide piece 54a with respect to the fixed piece 52b. It is inclined at a predetermined angle. That is, the inner guide piece 54 a and the outer guide piece 54 c are inclined at a predetermined angle with respect to the direction in which the cover 41 is attached to the gear case 31. Since the terminal plate 51 is formed of a plate material such as an elastic copper plate, the inner guide piece 54a is elastically deformable in a direction to increase or decrease the inclination angle with respect to the fixed piece 52b, and the outer guide piece. 54c is also elastically deformable in a direction to increase or decrease the inclination angle with respect to the inner guide piece 54a. Further, the curved piece 54b is also elastically deformable in a direction to increase or decrease the distance between the inner guide piece 54a and the outer guide piece 54c.

  On the other hand, as shown in FIG. 4, the gear case 31 is provided with a connection recess 61 which is a connection portion with the terminal plate 51. The gear case 31 is arranged on the inner side of the side wall 31b at a predetermined interval, and a connection wall 31d is integrally provided in parallel with the side wall 31b, and is divided into the connection wall 31d, the bottom wall 31a, and the side wall 31b. Thus, a connection recess 61 is formed. The connection wall 31d is formed such that the height from the bottom wall 31a is lower than the height from the bottom wall 31a of the side wall 31b. In addition, the top of the connection wall 31d, that is, the end in the height direction facing the cover 41, is inclined toward the connection recess 61, that is, the height from the bottom wall 31a decreases as the side wall 31b is approached. An inclined surface 62 that is inclined in the direction is formed.

  FIGS. 8A to 8C are explanatory views showing a state in which the case side connection portion of the terminal plate is connected to the connection concave portion of the gear case.

  When the cover 41 is attached to the gear case 31 from the attachment direction, the outer guide piece 54c of the case side connection portion 54 of the terminal plate 51 contacts the top of the side wall 31b of the gear case 31 as shown in FIG. Touch.

  Here, since the front end of the outer guide piece 54c is disposed in the accommodating recess 41b that is continuous with the engagement groove 41a of the cover 41, the engagement groove 41a of the cover 41 is engaged with the opening side end of the side wall 31b of the gear case 31. The outer guide piece 54c of the terminal board 51 can be visually observed from the outside until just before joining. Therefore, when the cover 41 is attached to the gear case 31, it is easy to visually confirm that the case side connecting portion 54 of the terminal plate 51 is disposed at a predetermined position from the gap between the combined portion of the cover 41 and the gear case 31. This makes it easy to attach the cover 41 to the gear case 31.

  As described above, in the wiper motor 11, the distal end of the outer guide piece 54 c of the terminal plate 51 is disposed in the accommodating recess 41 b that is continuous with the engaging groove 41 a of the cover 41, so that when the cover 41 is attached to the gear case 31. In addition, it is possible to easily visually confirm that the case side connection portion 54 of the terminal plate 51 is disposed at a predetermined position, and the work of attaching the cover 41 to the gear case 31 can be facilitated.

  Next, when the cover 41 moves further to the gear case 31 side from the state where the outer guide piece 54c is in contact with the top of the side wall 31b of the gear case 31, as shown in FIG. The outer guide piece 54c of 54 is elastically deformed in the direction along the side wall 31b of the gear case 31 and moves along the side wall 31b. When the outer guide piece 54c moves along the side wall 31b and the case side connection portion 54 is guided toward the connection recess 61, the curved piece 54b of the case side connection portion 54 is inclined at the top of the connection wall 31d. The curved piece 54 b is guided toward the connection recess 61 by the inclined surface 62. As a result, the inner guide piece 54a is elastically deformed so as to be parallel to the fixed piece 52b, and the entire case-side connection portion 54 is guided into the connection recess 61 of the gear case 31 as shown in FIG. Is done.

  As shown in FIG. 8C, when the engagement groove 41a of the cover 41 is engaged with the opening side end of the side wall 31b of the gear case 31, and the cover 41 is completely attached to the gear case 31, The case side connection portion 54 of the terminal plate 51 is in a state of being inserted into the connection recess 61. As a result, the case side connection portion 54 of the terminal plate 51 is electrically connected to the gear case 31 at the connection recess 61, that is, the inner surface of the side wall 31b or the inner surface of the connection wall 31d, and the feed circuit on the negative side of the control board 42 is connected to the terminal plate. It is connected to the gear case 31 via 51, that is, grounded.

  As described above, in the wiper motor 11, when the cover 41 is attached to the gear case 31, the case side connection portion 54 of the terminal plate 51 is fitted in the connection recess 61 provided in the gear case 31. The terminal plate 51 can be reliably connected to the gear case 31.

  Further, in the wiper motor 11, the height of the connection wall 31d provided in the gear case 31 is formed lower than the height of the side wall 31b, and an inclined surface 62 that is inclined toward the connection recess 61 is provided at the top of the connection wall 31d. The outer guide piece 54c of the terminal plate 51 is first guided against the side wall 31b, and then the curved piece 54b is guided by the inclined surface 62 and pulled into the connection recess 61. The side connection portion 54 can be reliably guided and inserted into the connection recess 61.

  When the case side connection portion 54 of the terminal plate 51 is fitted into the connection recess 61, the case side connection portion 54 reduces the inclination angle of the outer guide piece 54 c and the inner guide piece 54 a while reducing the interval between them. It will be in the state elastically deformed in the direction to make. That is, the case side connection portion 54 is fitted into the connection recess 61 in a state of being elastically deformed. Thereby, even if there is a dimensional error in the terminal plate 51 or the connection recess 61, the error is absorbed by the elastic deformation of the case side connection portion 54, and the case side connection portion 54 of the terminal plate 51 is securely attached to the gear case 31. Can be connected.

  As described above, in the wiper motor 11, the case side connection portion 54 is elastically deformed and is fitted into the connection recess 61. Therefore, the case side connection portion 54 is reliably connected to the gear case 31 in the connection recess 61. be able to. Thereby, the control board 42 can be reliably grounded to the gear case 31 using the terminal plate 51.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the present invention is applied to the wiper motor 11 used as a drive source of the vehicle wiper device. However, the present invention is not limited to this, and for example, for other applications such as a power window motor. You may make it apply this invention to the electric motor with a reduction mechanism used.

  Moreover, in the said embodiment, although the gear case 31 is formed with the aluminum alloy, you may make it form with other materials, such as not only this but a steel material, if it is a conductor.

It is a perspective view which shows the wiper motor which is one embodiment of this invention. It is sectional drawing which shows the internal structure of the wiper motor shown in FIG. It is the figure which looked at the cover shown in FIG. 1 from the inner surface side. It is sectional drawing which shows the grounding structure to the gear case of the control board by a terminal board. It is a perspective view which shows the detail of the terminal board shown in FIG. It is sectional drawing which shows the attachment structure to the cover of the terminal board shown in FIG. It is sectional drawing which follows the AA line in FIG. (A)-(c) is explanatory drawing which shows a mode that the case side connection part of a terminal plate is connected to the connection recessed part of a gear case, respectively.

Explanation of symbols

11 Wiper motor (electric motor with reduction mechanism)
DESCRIPTION OF SYMBOLS 12 Motor main body 13 Reduction gear 14 Yoke 15 Amateur 16 Amateur shaft 17 Bearing 18a, 18b Magnet 21 Amateur core 22 Amateur coil 23 Commutator 24 Brush 25 Brush holder 26 Spring 31 Gear case (reduction gear case)
31a Bottom wall 31b Side wall 31c Boss part 31d Connection wall 32 Worm gear mechanism (deceleration mechanism)
32a worm 32b worm wheel 33 fastening member 34, 35 bearing 36 output shaft 41 cover 41a engagement groove 41b receiving recess 42 control board 42a connection hole 43a, 43b power supply terminal 44 external connector 45 sensor magnet 46 hall sensor 47 partition member 51 terminal plate 52 fixed portions 52a, 52b fixed pieces 52c connecting pieces 53 board side connecting portions 54 case side connecting portions 54a inner guide pieces 54b curved pieces 54c outer guide pieces 55a, 55b mounting grooves 61 connecting recesses 62 inclined surfaces W1, W2 width dimensions

Claims (4)

An electric motor with a speed reduction mechanism comprising a motor body provided with an amateur shaft and a speed reduction mechanism that decelerates rotation of the amateur shaft and outputs from the output shaft,
A yoke formed into a bottomed cylindrical shape and rotatably supporting the armature shaft;
A reducer case that is formed in a bathtub shape having a bottom wall and a side wall by a conductor and is fixed to the yoke and accommodates the reduction mechanism;
A cover for covering the entire periphery of the outer peripheral edge, and a cover for closing the speed reducer case by engaging the engagement groove with the opening side end of the side wall;
A control board attached to the inner surface of the cover and controlling the operation of the motor body;
A connection wall that is provided integrally with the speed reducer case side by side inside the side wall, and forms a connection recess by the side wall and the bottom wall;
A board-side connecting portion electrically connected to the control board; a fixing portion formed integrally with the board-side connecting portion and fixed to the cover; and a tip formed integrally with the fixing portion in a U shape. And a terminal plate provided with a case-side connection portion that is disposed in an accommodation recess connected to the engagement groove and is fitted into the connection recess when the cover is attached to the speed reducer case. An electric motor with a reduction mechanism.   2. The electric motor with a speed reduction mechanism according to claim 1, wherein the fixed portion is formed in a U-shape, and the width of one piece connected to the board side connecting portion of the fixed portion is connected to the case side connecting portion. A pair of attachment grooves having width dimensions corresponding to the respective pieces of the fixing portion are provided on the cover, and the respective pieces of the fixing portion are engaged with the corresponding attachment grooves. An electric motor with a speed reduction mechanism, wherein the terminal plate is attached to the cover.   3. The electric motor with a speed reduction mechanism according to claim 1, wherein a height of the connection wall from the bottom wall is lower than a height of the side wall from the bottom wall, and the connection wall is formed at a top portion of the connection wall. An electric motor with a speed reduction mechanism, wherein an inclined surface inclined toward the recess is formed.   The electric motor with a speed reduction mechanism according to any one of claims 1 to 3, wherein the case side connection portion is fitted into the connection recess in an elastically deformed state.

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