JP4950921B2 - Motor equipment - Google Patents

Description

  The present invention includes a yoke that rotatably accommodates a rotating shaft, a gear housing that accommodates a speed reducing mechanism that decelerates rotation of the rotating shaft, one end connected to the speed reducing mechanism, and the other end extended to the outside of the gear housing. The present invention relates to a motor device having an output shaft.

  2. Description of the Related Art Conventionally, as a drive source for a wiper device or a power window device mounted on a vehicle such as an automobile, a motor device having a speed reduction mechanism that reduces the rotation of the rotation shaft and an output shaft that outputs the rotation of the speed reduction mechanism is used. Therefore, this motor device is reduced in size and weight to obtain a large output, for example, to improve the mounting property on a vehicle.

  A drive mechanism such as a wiper link or a wind regulator is connected to the output shaft of the motor device, and a driven object such as a wiper blade or window glass can be driven by driving the drive mechanism by the motor device. When the driven object is a wiper blade, the sliding resistance between the wiper blade and the windshield is relatively large. When the driven object is a window glass, the weight of the wind glass is Bulky. For this reason, a relatively large reaction force is applied to the output shaft of the motor device in the direction in which the output shaft is inclined.

  The output shaft is rotatably supported by a support portion formed on a gear housing that houses the speed reduction mechanism, and the inclination of the output shaft as described above can be suppressed by increasing the rigidity of the support portion. However, if the thickness of the gear housing is simply increased in order to increase the rigidity of the support portion, an increase in the size and weight of the motor device cannot be avoided. Therefore, in order to reduce the size and weight of the motor device while increasing the rigidity of the support portion, a reinforcing rib is provided around the support portion of the gear housing.

As a motor device in which a reinforcing rib is provided in a gear housing, for example, a technique described in Patent Document 1 is known. The motor device (driving device) described in Patent Literature 1 includes an outer rib so as to surround the periphery of the passage hole (support portion) for the driven shaft (output shaft), and the outer side of the passage hole and the outer side. A plurality of reinforcing ribs extending radially from the passage hole toward the outer rib are provided between the ribs. These reinforcing ribs are formed by integrally connecting a portion having a high height and a portion having a low height in the radial direction of the reinforcing rib.
Japanese Patent Laying-Open No. 2003-047204 (FIG. 2)

  However, according to the motor device described in Patent Document 1 described above, the corner portion is provided between the portion where the height dimension of the reinforcing rib is high and the portion where the height is low, and the reaction from the driven object. When a force is input to the support portion via the output shaft, stress is concentrated on the corner portion of the reinforcing rib. Therefore, problems such as cracks occurring at the corners of the reinforcing ribs may occur when the motor device is in a use state in which a large load is applied (for example, driving of the wiper device during snow accumulation). As described above, the motor device described in Patent Document 1 can be expected to reduce the size and weight of the motor device because the reinforcing rib is provided with a portion having a low height, but has the disadvantages of the reinforcing rib as described above. There was a need to improve.

  An object of the present invention is to provide a motor device that can disperse stress acting partially on a reinforcing rib to other portions of the reinforcing rib without increasing the thickness dimension or height dimension of the reinforcing rib. is there.

  The motor device of the present invention includes a yoke that rotatably accommodates a rotating shaft, a gear housing that houses a speed reducing mechanism that decelerates rotation of the rotating shaft, and one end side connected to the speed reducing mechanism and the other end side of the gear housing. A motor device having an output shaft extending to the outside, the support device being provided in the gear housing and rotatably supporting the output shaft, and being spaced apart from the support portion and surrounding the support portion An outer rib provided on the support portion, and a plurality of reinforcing ribs provided radially from the support portion toward the outer rib, the reinforcement rib provided on the outer rib side of the support portion, A first rib having a first end face facing in the axial direction; a second rib provided on the support portion side of the outer rib; and having a second end face facing in the axial direction of the support portion; the first rib; With the second rib A main rib provided with a third rib having an arcuate surface connecting the first end surface and the second end surface, and at least one of both side surfaces of the main rib within a range of a side surface of the main rib And having a constant width and a gradually decreasing cross-sectional area from the support portion toward the outer rib, and an auxiliary rib having an arc surface corresponding to the third rib.

  In the motor device of the present invention, the height dimension of the first rib with respect to the axial direction of the support portion is set to a height dimension higher than the height dimension of the second rib, and the third rib is closer to the support portion. It is characterized by providing.

  The motor device according to the present invention is characterized in that a fixing portion for fixing the gear housing to an attachment object is provided on a side opposite to the support portion side of the outer rib.

  According to the motor device of the present invention, the reinforcing rib includes the first rib having the first end surface, the second rib having the second end surface, and the third rib having the arc surface connecting the first end surface and the second end surface. And a main rib provided on at least one of both side surfaces of the main rib within the range of the side surface of the main rib, and the cross-sectional area gradually decreases from the support portion toward the outer rib with a constant width. And an auxiliary rib having an arc surface corresponding to the rib. Therefore, stress can be generated in the third rib and the reinforcing rib having the arc surface, and the stress can be distributed to the first rib side and the second rib side where the cross-sectional area is reduced by the auxiliary rib with the arc surface as a boundary. Further, it is possible to suppress the occurrence of cracks or the like due to partial concentration of stress on the reinforcing rib. In addition, when the thickness dimension of the reinforcing rib in the third rib portion including the auxiliary rib is set as a reference dimension, the reinforcing rib is compared with the reinforcing rib of the conventional structure not including the auxiliary rib having the reference dimension over the entire area. A reduction in size and weight can be achieved, and as a result, a reduction in size and weight of the motor device can be achieved.

  According to the motor device of the present invention, the height dimension of the first rib with respect to the axial direction of the support part is set to a height dimension higher than the height dimension of the second rib, and the third rib is provided closer to the support part. Of the first rib to the third rib, the proportion of the second rib having a low height can be increased. Therefore, it is possible to further reduce the size and weight of the motor device by suppressing the protruding amount of the reinforcing rib.

  According to the motor device of the present invention, the fixing portion for fixing the gear housing to the object to be attached is provided on the side opposite to the supporting portion side of the outer rib, so that the supporting portion and the fixing portion are in a separated position. In a gear housing, that is, a gear housing in which a relatively large reaction force can be input to the support portion, stress concentration on the reinforcing rib can be reduced.

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

  1 is an explanatory view for explaining a wiper device provided with a motor device according to the present invention, FIG. 2 is an enlarged perspective view showing the wiper device of FIG. 1, and FIG. 3 is a side of a reinforcing rib on the motor device of FIG. 4 is an explanatory view for explaining the structure of the gear housing, and FIG. 5 is an explanatory view for explaining the structure of the reinforcing rib.

  As shown in FIG. 1, a windshield 11 as a windshield is provided on the front side of a vehicle 10 such as an automobile. On the windshield 11, rain, dust, etc. adhering to the windshield 11 are provided. A DR side (driver's seat side) wiper member 12 and an AS side (passenger seat side) wiper member 13 to be wiped are provided.

  The DR-side wiper member 12 has a DR-side wiper blade 12a and a DR-side wiper arm 12b, and the DR-side wiper blade 12a is rotatably attached to the distal end side of the DR-side wiper arm 12b. The AS-side wiper member 13 has an AS-side wiper blade 13a and an AS-side wiper arm 13b, and the AS-side wiper blade 13a is rotatably attached to the distal end side of the AS-side wiper arm 13b.

  The wiper blades 12a and 13a perform a reciprocating wiping operation in the same direction in synchronization with each wiping range 11a and 11b formed between the lower inversion position LRP and the upper inversion position URP on the windshield 11. It has become. That is, the wiping pattern of each wiper blade 12a, 13a is a tandem type.

  A wiper device 14 that swings and drives the wiper members 12 and 13 is mounted on the front end side of the windshield 11 in the vehicle 10.

  As shown in FIG. 2, the wiper device 14 includes a DR side pivot holder 15 a and an AS side pivot holder 15 b that are respectively fixed to the vehicle 10. Each pivot holder 15a, 15b is connected by a frame member 16 made of a hollow pipe member, and the wiper device 14 is a so-called frame-integrated modular wiper device.

  Each pivot holder 15a, 15b supports the DR side pivot shaft 17a and the AS side pivot shaft 17b so as to be rotatable. As shown in FIG. 1, the proximal end side of the DR side wiper arm 12b is fixed to the distal end side of the DR side pivot shaft 17a, and the proximal end side of the AS side wiper arm 13b is fixed to the distal end side of the AS side pivot shaft 17b. ing.

  One end sides of the DR side drive lever 18a and the AS side drive lever 18b are fixed to the base end sides of the pivot shafts 17a and 17b, respectively. The other end side of each drive lever 18a, 18b is rotatably connected to the end of the connecting rod 19 via a ball joint (not shown). One end side of the drive rod 20 is rotatably connected to the other end side of the AS side drive lever 18b via a ball joint (not shown), and the other end side of the drive rod 20 is connected to the ball joint. It is rotatably connected to one end side of the crank arm 21 via BJ (see FIG. 3).

  The other end side of the crank arm 21 is fixed to the output shaft 44 (see FIG. 3) of the wiper motor 30, and the crank arm 21 has one end side (connection portion with the drive rod 20) as the output shaft 44 rotates. Is designed to rotate. Here, the crank arm 21, the drive rod 20, the AS-side drive lever 18b, the connecting rod 19 and the DR-side drive lever 18a constitute a wiper link (link mechanism), and this wiper link rotates the output shaft 44. Is converted into a swing motion, and the pivot shafts 17a and 17b are driven to swing.

  A wiper motor 30 as a motor device is provided on the DR side (right side in the drawing) of the frame member 16. As shown in FIG. 3, the wiper motor 30 includes a motor main body 31 and a gear housing 32, and the motor main body 31 and the gear housing 32 are fixed by fastening screws 33.

  The motor body 31 includes a yoke 34 formed into a bottomed cylindrical shape by press forming (deep drawing) a thin steel plate or the like. A pair of permanent magnets 35 having a substantially arc-shaped cross section are fixed to the inner peripheral wall of the yoke 34. Inside each permanent magnet 35, an armature in which a coil (not shown) is wound around the outer periphery. A (rotor) 36 is rotatably provided. An amateur shaft (rotating shaft) 37 is fixed at the rotation center of the amateur 36, and the armature shaft 37 is rotatably provided inside the yoke 34.

  A commutator 38 is provided in a substantially middle portion of the amateur shaft 37, and an end of a coil wound around the amateur 36 is electrically connected to the commutator 38. In addition, a pair of brushes 39 are in sliding contact with the commutator 38, and a drive current is supplied to each of the brushes 39 by supplying a drive current to each brush 39. As a result, an electromagnetic force is generated in the armature 36 and the armature shaft 37 rotates with respect to the yoke 34.

  A worm 40 is integrally provided on the distal end side (left side in the figure) of the amateur shaft 37, and the worm 40 extends to the inside of the gear housing 32 and rotates inside the gear housing 32. It has become.

  As shown in FIG. 2, a cover 41 made of a resin material such as plastic is attached to the opening side of the gear housing 32. The cover 41 is integrally provided with a connector connecting portion 42, and a vehicle side connector (not shown) for supplying a driving current to each brush 39 is connected to the connector connecting portion 42. It has become.

  The gear housing 32 is formed in a bottomed shape as shown in FIGS. 3 and 4, and the gear housing 32 is formed into a predetermined shape (casting) by pouring molten aluminum material into a mold. Yes.

  A worm wheel 43 that meshes with the worm 40 is rotatably accommodated inside the gear housing 32, and one end side of the output shaft 44 is fixed to the rotation center of the worm wheel 43. The other end side of the output shaft 44 extends outside the gear housing 32, and the other end side of the crank arm 21 is fixed to the other end side of the output shaft 44 by a nut 45. Here, the worm 40 and the worm wheel 43 constitute a speed reduction mechanism in the present invention. This speed reduction mechanism reduces the rotation of the armature shaft 37 to a predetermined speed to increase the torque, and via the output shaft 44. Output to the outside (wiper link).

  The gear housing 32 is integrally provided with a fixed leg 46 that is fixed to a bulkhead or the like (not shown) of the vehicle 10, and a rubber bush 47 as a cushion member is provided on the distal end side of the fixed leg 46. It is installed. The rubber bush 47 suppresses rattling of the gear housing 32 with respect to the vehicle 10.

  As shown in FIG. 4, a substantially cylindrical support portion 48 that rotatably supports the output shaft 44 is integrally provided at a substantially central portion of the bottom portion 32 a of the gear housing 32. Further, on the outer peripheral side of the support portion 48 of the gear housing 32, an outer rib 49 that is formed in a substantially annular shape so as to surround the support portion 48 is provided integrally with the support portion 48 at a predetermined distance. The support portion 48 and the outer rib 49 protrude from the bottom portion 32a of the gear housing 32 by a predetermined amount, and the height dimension of the support portion 48 from the bottom portion 32a is higher than the height dimension of the outer rib 49 from the bottom portion 32a. The height dimension is set.

  Further, a plurality of reinforcing ribs 50 extending radially from the support portion 48 toward the outer rib 49 are integrally provided on the bottom portion 32 a of the gear housing 32 between the support portion 48 and the outer rib 49. Each reinforcing rib 50 reinforces the support portion 48 in cooperation with the outer rib 49, and when a reaction force F as shown by a two-dot chain line arrow in FIG. 4 acts on the output shaft 44, The deformation of the support portion 48 in the tilt direction is suppressed.

  On the side opposite to the support portion 48 side of the outer rib 49 in the gear housing 32 (lower side in FIG. 3), a fixing portion 51 having a substantially arc-shaped cross section is integrally provided. The fixing portion 51 plays a role of fixing the gear housing 32 to the frame member 16 (see FIG. 2) as an attachment object, and is provided apart from the support portion 48. Thus, by providing the fixed portion 51 away from the support portion 48, contact between the frame member 16 and the crank arm 21 is avoided.

  As described above, the gear housing 32 has a structure in which the support portion 48 and the fixed portion 51 are provided apart from each other, and the support portion 48 is relatively easy to receive a reaction force from the output shaft 44. Particularly in the gear housing having such a structure, it is desirable that the reaction force F acting on the support portion 48 is efficiently distributed and transmitted to each reinforcing rib 50, and each reinforcing rib provided on the bottom portion 32 a of the gear housing 32. 50 adopts the following structure.

  That is, as shown in FIG. 5, each reinforcing rib 50 is configured by three portions respectively in the radial direction and the circumferential direction of the support portion 48. Each reinforcing rib 50 includes a main rib 52 having a thickness dimension set to about 2.0 mm. The main rib 52 includes a first rib 53, a third rib 54, and a second rib 55 from the support portion 48 side. It has three ribs.

  The first rib 53 has a first end surface 53 a that faces the axial direction of the support portion 48, and is integrally provided on the outer rib 49 side (radially outer side) of the support portion 48. An end portion of a grommet seal (not shown) that seals between the support portion 48 and the output shaft 44 is placed on the first end surface 53a. The first end surface 53a has a grommet seal. Has a function to position.

  The second rib 55 has a second end surface 55 a facing the axial direction of the support portion 48, and is integrally provided on the support portion 48 side (radially inner side) of the outer rib 49. Each end surface 53a, 55a of each rib 53, 55 is substantially parallel to the bottom 32a of the gear housing 32, and the height dimension of the second end surface 55a is lower than the height dimension of the first end surface 53a. Set to dimensions.

  Between the 1st rib 53 and the 2nd rib 55, the 3rd rib 54 which has the circular arc surface 54a which connects each end surface 53a, 55a is provided. The third rib 54 is disposed closer to the support portion 48, and therefore the length dimension of the first rib 53 with respect to the radial direction of the support portion 48 is shorter than the length dimension of the second rib 55. Thus, by providing the third rib 54 closer to the support portion 48, the proportion of the second rib 55 having a low height is increased, and the gear housing 32 is reduced in size and weight.

  The reinforcing rib 50 further includes a pair of auxiliary ribs 56 and 57 each having a thickness dimension set to about 0.5 mm. The auxiliary ribs 56 and 57 are integrally provided on both side surfaces of the main rib 52 with respect to the circumferential direction of the support portion 48. Each of the auxiliary ribs 56 and 57 is formed in a substantially triangular shape so as to be within the range of the side surface of the main rib 52, that is, within the projection range when the main rib 52 is viewed from the circumferential direction of the support portion 48. A constant width is formed toward the rib 49 and the cross-sectional area is gradually reduced.

  Similarly to the main rib 52, each of the auxiliary ribs 56 and 57 includes three ribs including the first auxiliary ribs 56a and 57a, the third auxiliary ribs 56b and 57b, and the second auxiliary ribs 56c and 57c from the support portion 48 side. ing.

  The first auxiliary ribs 56 a and 57 a are provided corresponding to the first ribs 53 of the main rib 52, and the end surfaces of the first auxiliary ribs 56 a and 57 a facing the axial direction of the support portion 48 are descending toward the outer rib 49. Thus, the first inclined surfaces 56d and 57d are formed. The second auxiliary ribs 56 c and 57 c are provided corresponding to the second rib 55 of the main rib 52, and the end surfaces of the support portions 48 of the second auxiliary ribs 56 c and 57 c facing the axial direction are descending toward the outer rib 49. The second inclined surfaces 56e and 57e are formed.

  The third auxiliary ribs 56b and 57b are provided corresponding to the third rib 54 of the main rib 52, and the end surfaces of the third auxiliary ribs 56b and 57b facing the axial direction of the support portion 48 are arcuate surfaces 54a of the third rib 54. The auxiliary arc surfaces 56f and 57f have the same curvature radius.

  Each of the auxiliary ribs 56 and 57 assists (reinforces) the main rib 52 and applies stress acting on the third rib 54 of the main rib 52 to the first rib 53 side and the second rib 55 side, that is, the first rib of the reinforcing rib 50. It has a function (stress distribution function) for dispersing to other parts excluding the three ribs 54.

  Here, the stress distribution function of the reinforcing rib 50 will be described. As shown in FIG. 5, the reinforcing rib 50 is provided at both ends of the third rib 54 and the third auxiliary ribs 56 b and 57 b with respect to the radial direction of the support portion 48. Four cutouts L1 to L4 that reduce the cross-sectional area are provided. Accordingly, the notches L1 to L4 reduce the rigidity of the both ends of the third rib 54 and the third auxiliary ribs 56b and 57b, and stress concentrated on the third rib 54 and the third auxiliary ribs 56b and 57b. It can be distributed.

  Next, the operation (stress distribution function) of the wiper motor 30 configured as described above will be described in detail with reference to the drawings.

  FIG. 6 is an explanatory diagram for explaining a measurement portion of the cross-sectional secondary moment of the reinforcing rib, FIG. 7 is a graph showing the magnitude of the cross-sectional secondary moment for each section shown in FIG. 6, and FIG. The figure which shows the simulation result of a reinforcement rib (comparative example 1) in case a reinforcement rib and thickness are constant is each represented.

  When the wiper motor 30 is operated by operating an operation switch (not shown), the output shaft 44 rotates in a predetermined direction, and a reaction force having a predetermined magnitude is applied to the output shaft 44 via the wiper members 12 and 13 and the wiper link. F (see FIG. 4) is input. Then, the reaction force F is applied to the support portion 48 in the direction in which the support portion 48 is inclined, and accordingly, each reinforcing rib 50 is stretched or compressed in the radial direction of the support portion 48. Stress is applied in the direction. The stress at this time is concentrated on the portion where the cross-sectional area of each reinforcing rib 50 changes greatly, that is, the third rib 54 and the third auxiliary ribs 56b and 57b.

  Each reinforcing rib 50 was divided into sections (S1 to S15) as shown in FIG. 6 and the cross-sectional secondary moment at the portion was measured, and the result was as shown in FIG. 7 corresponds to the first rib 53 and the first auxiliary ribs 56a and 57a, and the region (2) corresponds to the third rib 54 and the third auxiliary ribs 56b and 57b. The region (3) indicates a portion corresponding to the second rib 55 and the second auxiliary ribs 56c and 57c.

  Each reinforcing rib 50 has a high rigidity equivalent to that in the region (2) when the rib thickness is constant at 3.0 mm (Comparative Example 1), and the rib thickness is 2.0 mm. As compared with the case (Comparative Example 2), the rigidity is sufficient. This is due to the fact that the third rib 54 and the third auxiliary ribs 56b and 57b are integrated into substantially the same shape to ensure a sufficient thickness dimension.

  Further, each reinforcing rib 50 has lower rigidity than Comparative Example 1 and higher rigidity than Comparative Example 2 in the region (1) and the region (3). The first auxiliary ribs 56a and 57a and the second auxiliary ribs 56c and 57c whose cross-sectional area decreases from the support portion 48 toward the outer rib 49 are provided on both side surfaces of the first rib 53 and the second rib 55. This is due to the fact that the cutout portions L1 to L4 shown in FIG. 5 are provided.

  Thus, each reinforcing rib 50 secures sufficient rigidity in the region (2), and decreases rigidity in the region (1) and the region (3). Therefore, as shown in the simulation result of FIG. 8, the stress concentrated on the third rib 54 and the third auxiliary ribs 56 b and 57 b of each reinforcing rib 50 is caused to reduce the rigidity reduced portion in the vicinity thereof, that is, the first rib 53 and It is possible to effectively disperse the second rib 55 side. Here, the dark-colored portion shown in FIG. 8 represents a portion where a greater stress is applied than the light-colored portion in FIG. It was confirmed that the stress concentration can be sufficiently relaxed as compared with the case where the thickness is constant at 3.0 mm.

  As described above in detail, according to the wiper motor 30 according to the present embodiment, the reinforcing rib 50 includes the first rib 53 having the first end surface 53a, the second rib 55 having the second end surface 55a, and the first rib 55. A main rib 52 having a third rib 54 having a circular arc surface 54a connecting the end surface 53a and the second end surface 55a, and provided on both side surfaces of the main rib 52 within the range of the side surface of the main rib 52. The auxiliary ribs 56 and 57 are provided with auxiliary arcuate surfaces 56f and 57f corresponding to the third ribs 54 with a constant width and gradually decreasing toward 49.

  Accordingly, a stress is generated in the third rib 54 and the third auxiliary ribs 56b and 57b having the arc surface 54a and the auxiliary arc surfaces 56f and 57f, and the stress is applied to the first arc with the arc surfaces 54a, 56f and 57f as a boundary. The auxiliary ribs 56a and 57a and the second auxiliary ribs 56c and 57c can be dispersed on the first rib 53 side and the second rib 55 side where the cross-sectional area decreases. Therefore, it is possible to suppress the occurrence of cracks and the like due to partial concentration of stress on the reinforcing rib 50.

  In addition, when the thickness dimension of the reinforcing rib 50 in the third rib 54 portion including the auxiliary ribs 56 and 57 is set as a reference dimension, the reinforcing rib having a conventional structure without the auxiliary rib having the reference dimension over the entire area (comparison) Compared to Example 1), the reinforcing rib 50 can be reduced in size and weight, and as a result, the wiper motor 30 can be reduced in size and weight.

  According to the wiper motor 30 according to the present embodiment, the height dimension of the first rib 53 with respect to the axial direction of the support portion 48 is set to a height dimension higher than the height dimension of the second rib 55, and the third rib 54 is Since the first rib 53 to the third rib 54 are provided close to the support portion 48, the proportion of the second rib 55 having a low height can be increased. Therefore, the protrusion amount of the reinforcing rib 50 can be suppressed and the wiper motor 30 can be further reduced in size and weight.

  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 case where the present invention is applied to all the reinforcing ribs 50 between the support portion 48 and the outer rib 49 has been described. However, the present invention is not limited to this, and the output shaft 44 is interposed. Thus, the present invention may be selectively applied among a plurality of auxiliary ribs according to the magnitude of the reaction force F input to the support portion 48, the input direction of the reaction force F, and the like.

  In the above-described embodiment, the pair of auxiliary ribs 56 and 57 are arranged opposite to each other on both side surfaces of the main rib 52. However, the present invention is not limited to this, and the support portion 48 is provided via the output shaft 44. Auxiliary ribs may be provided on either one of the side surfaces of the main rib 52 in accordance with the magnitude of the reaction force F input to the direction, the input direction of the reaction force F, or the like.

  Further, in the above-described embodiment, the support portion 48 and the fixing portion 51 are provided at positions separated from each other. However, the present invention is not limited to this, for example, the surroundings of the support portion 48 The present invention can also be applied to a device having a plurality of fixing portions in the vicinity. In this case, since the reaction force F input to the support portion 48 can be dispersed in the fixed portion, the width and height dimensions of the reinforcing rib 50 can be reduced, and the wiper motor 30 can be made smaller and lighter. Become.

  In the above embodiment, the third rib 54 is provided near the support portion 48. However, the present invention is not limited to this. For example, if the space in the protruding direction of the reinforcing rib 50 has a margin. The third rib 54 can be provided closer to the outer rib 49.

  Furthermore, in the said embodiment, although the thing which is the wiper motor 30 was shown as a motor apparatus which has a deceleration mechanism, this invention is not restricted to this, The motor apparatus used for a power window apparatus, a slide door opening / closing apparatus, etc. The present invention can also be applied.

It is explanatory drawing explaining the wiper apparatus provided with the motor apparatus which concerns on this invention. It is a perspective view which expands and shows the wiper apparatus of FIG. It is explanatory drawing which looked at the motor apparatus of FIG. 2 from the reinforcement rib side. It is explanatory drawing explaining the structure of a gear housing. It is explanatory drawing explaining the structure of a reinforcement rib. It is explanatory drawing explaining the measurement part of the cross-sectional secondary moment of a reinforcement rib. It is the graph which showed the magnitude | size of the cross-sectional secondary moment for every section shown in FIG. It is a figure which shows the simulation result of the reinforcement rib which concerns on this invention, and the reinforcement rib (comparative example 1) in the case of constant thickness.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle 11 Windshield 11a, 11b Wiping range 12 DR side wiper member 12a DR side wiper blade 12b DR side wiper arm 13 AS side wiper member 13a AS side wiper blade 13b AS side wiper arm 14 Wiper device 15a DR side pivot holder 15b AS side pivot holder Holder 16 Frame member (object to be attached)
17a DR side pivot shaft 17b AS side pivot shaft 18a DR side drive lever 18b AS side drive lever 19 Connecting rod 20 Drive rod 21 Crank arm 30 Wiper motor (motor device)
31 Motor body 32 Gear housing 32a Bottom 33 Fastening screw 34 Yoke 35 Permanent magnet 36 Amateur 37 Amateur shaft (rotating shaft)
38 Commutator 39 Brush 40 Worm (Deceleration mechanism)
41 Cover 42 Connector connection 43 Worm wheel (deceleration mechanism)
44 Output shaft 45 Nut 46 Fixed leg 47 Rubber bush 48 Support part 49 Outer rib 50 Reinforcement rib 51 Fixed part 52 Main rib (reinforcement rib)
53 1st rib 53a 1st end surface 54 3rd rib 54a Circular arc surface 55 2nd rib 55a 2nd end surface 56,57 Auxiliary rib (reinforcement rib)
56a, 57a First auxiliary rib 56b, 57b Third auxiliary rib 56c, 57c Second auxiliary rib 56d, 57d First inclined surface 56e, 57e Second inclined surface 56f, 57f Auxiliary arc surface (arc surface)
BJ Ball joint F Reaction force L1 to L4 Notch LRP Lower reverse position URP Upper reverse position

Claims (3)

A yoke that rotatably accommodates the rotation shaft, a gear housing that accommodates a speed reduction mechanism that decelerates rotation of the rotation shaft, and an output having one end connected to the speed reduction mechanism and the other end extended outside the gear housing A motor device having a shaft,
A support portion provided in the gear housing and rotatably supporting the output shaft;
An outer rib provided to be separated from the support portion and surround the support portion;
A plurality of reinforcing ribs provided radially from the support portion toward the outer rib,
The reinforcing rib,
A first rib having a first end surface provided on the outer rib side of the support portion and facing an axial direction of the support portion, and provided on the support portion side of the outer rib and facing an axial direction of the support portion. A main rib provided with a second rib having a second end surface, and a third rib having an arc surface provided between the first rib and the second rib and connecting the first end surface and the second end surface When,
Provided on at least one of both side surfaces of the main rib within the range of the side surface of the main rib, the cross-sectional area gradually decreases from the support portion toward the outer rib, and the third rib A motor device comprising: an auxiliary rib having a corresponding arc surface.   2. The motor device according to claim 1, wherein a height dimension of the first rib with respect to an axial direction of the support part is set to a height dimension higher than a height dimension of the second rib, and the third rib is the support part. A motor device characterized by being provided close to the motor device.   3. The motor device according to claim 1, wherein a fixing portion for fixing the gear housing to an attachment object is provided on a side opposite to the support portion side of the outer rib.