JP6091160B2 - Motor equipment - Google Patents

Description

  The present invention relates to a motor device including a motor unit having a rotation shaft and a gear unit having a gear for transmitting rotation of the rotation shaft to an output shaft.

  2. Description of the Related Art Conventionally, a motor device including a motor unit and a gear unit has been used as a drive source for a wiper device or a power window device mounted on a vehicle such as an automobile. The motor unit and the gear unit are connected to each other by a fixing screw, the motor unit includes a rotating shaft that rotates at a predetermined speed in a predetermined direction by supplying a driving current, and the gear unit includes a gear that transmits the rotation of the rotating shaft to the output shaft. ing. The gear has a function as a speed reduction mechanism that reduces the rotation of the rotary shaft to increase the torque, and thereby, it is possible to obtain a large output even though it is small, thereby improving the in-vehicle performance.

  Such a motor device includes a connector unit to which an external connector on the vehicle side is connected in addition to the motor unit and the gear unit. The connector unit is configured to supply a drive current from an external connector to the motor unit and to send the rotation state of the gear unit to the in-vehicle controller as a feedback signal. As a motor apparatus provided with such a connector unit, for example, a technique described in Patent Document 1 is known.

  The electric motor (motor device) with a speed reduction mechanism described in Patent Document 1 has a connector (connector unit) fixed on the outer surface of a gear case forming a speed reducer (gear portion), and a power supply terminal is connected to this connector. And electronic components such as switch terminals (contact plates). The power supply terminal supplies the drive current from the external connector to the motor body (motor part) via the brush holder, and the switch terminal contacts the relay plate (switching plate) that rotates with the worm wheel (gear) to contact the worm wheel. The rotation position signal is detected.

JP 2009-005482 A (FIGS. 1, 3 and 5)

  However, in the motor device described in Patent Document 1 described above, the connector is fixed on the outer surface of the gear case using a plurality of fastening members (fixing screws), and the opening of the gear case In order to prevent rainwater or the like from entering the gear case, a lid member (cover) is attached using a plurality of fastening members. Therefore, not only the number of fastening members increases, but also the fastening members need to be screw-coupled from the front side of the gear case and the back side on the opposite side, causing problems such as complicating parts management and assembly processes.

  An object of the present invention is to provide a motor device that can simplify an assembly process while reducing the number of parts.

A motor device according to the present invention is a motor device including a motor unit having a rotating shaft and a gear unit having a gear for transmitting rotation of the rotating shaft to an output shaft, the bottom wall portion and the other side on one side has an opening in a gear case in which the gear therein is housed rotatably, and provided et the connector unit in the gear case is provided in the connector unit, is covered around said gear case, and A connector connecting portion to which an external connector is connected, a contact plate provided in the connector unit and slidably contacted with a switching plate provided in the gear to detect the rotational state of the gear, and the opening is closed. together, and a cover member for clamping between the connector unit and the bottom wall portion, the connector unit is set to the opposing portion of said cover member The first abutment protrusion which is characterized by a second Rukoto abutting projections and has not been formed, which is provided on the counter-portion of said bottom wall portion.
The motor device according to the present invention is characterized in that a third abutting convex portion is provided at a portion of the connector connecting portion facing the bottom wall portion.
In the motor device according to the present invention, a fourth abutting convex portion and a fifth abutting convex portion are respectively provided on a portion of the connector unit facing the gear case on one side surface and the other side surface along the axial direction of the rotation shaft. It is provided.

  The motor device of the present invention is characterized in that a fixing portion for fixing the motor device to a fixed object is provided on the cover member.

  The motor device according to the present invention is characterized in that the cover member is formed by pressing a steel plate.

  In the motor device according to the present invention, a connecting member provided between the gear and the output shaft is provided with a sliding contact portion that is in sliding contact with the cover member.

  According to the motor device of the present invention, the connector unit having the connector connecting portion and the contact plate is sandwiched between the cover member and the bottom wall portion of the gear case by closing the opening portion of the gear case with the cover member. Therefore, the connector unit can be fixed in the gear case by housing the connector unit together with the gear from the opening of the gear case in the gear case and closing the opening with the cover member. As a result, the number of fixing screws can be reduced as compared with the prior art, and the assembly process of the motor device can be simplified.

  According to the motor device of the present invention, since the fixing member for fixing the motor device to the fixed object is provided on the cover member, the motor device can be fixed to the fixed object without separately providing a mounting bracket or the like. Can do.

  According to the motor device of the present invention, since the cover member is formed by pressing a steel plate, the cover member can be easily formed, and further, electrical noise from the connector unit can be transmitted to the outside. Can be prevented.

  According to the motor device of the present invention, at least one of the facing portion of the connector unit facing the cover member and the facing portion of the cover member facing the connector unit is in contact with at least one of the facing portions. Since the abutment convex portion is provided, both can be abutted stably compared to the case where they are abutted on a flat surface, and the generation of noise can be suppressed.

  According to the motor device of the present invention, the connecting member provided between the gear and the output shaft is provided with the sliding contact portion that is in sliding contact with the cover member. Therefore, the generation of noise can be suppressed.

It is a perspective view of the rear wiper motor mounted in a vehicle. It is a top view which shows the internal structure of the rear wiper motor of FIG. It is a perspective view which shows the detailed structure of a gear case. It is the perspective view which looked at the connector unit from the front side. It is the perspective view which looked at the connector unit from the back side. It is explanatory drawing explaining the relationship between a switching plate and a contact plate. It is explanatory drawing explaining the attachment procedure (assembly procedure 1) to the gear case of a connector unit and a brush holder. It is explanatory drawing explaining the mounting procedure (assembly procedure 2) to the gear case of a motor part. It is explanatory drawing explaining the installation procedure (assembly procedure 3) to the gear case of a worm wheel and a motion conversion mechanism. It is explanatory drawing explaining the installation procedure (assembly procedure 4) to the gear case of a bracket cover. It is a top view which expands and shows the gear part of the rear wiper motor which concerns on 2nd Embodiment.

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

  1 is a perspective view of a rear wiper motor mounted on a vehicle, FIG. 2 is a plan view showing an internal structure of the rear wiper motor of FIG. 1, FIG. 3 is a perspective view showing a detailed structure of a gear case, and FIG. 4 is a connector unit. FIG. 5 is a perspective view of the connector unit viewed from the back side, and FIG. 6 is an explanatory diagram for explaining the relationship between the switching plate and the contact plate.

  As shown in FIG. 1, a rear wiper motor 10 as a motor device is used as a drive source for a rear wiper device (not shown) mounted on a rear hatch of a vehicle, and includes a motor unit 20 and a gear unit 30. . The motor unit 20 and the gear unit 30 are coupled together by a pair of fixing screws 11 (only one is shown in the drawing).

  The gear unit 30 includes a bracket cover 80, and the bracket cover 80 is attached to the gear case 31 via four fixing screws 12. Thus, the rear wiper motor 10 is fixed to a narrow space such as a rear hatch by the bracket cover 80. Then, by rotating the rear wiper motor 10, a wiper blade (not shown) provided on a rear glass (wind shield) (not shown) is reciprocally wiped (oscillated) within a predetermined angle range. .

  As shown in FIG. 2, the motor unit 20 is configured as a four-pole motor with a brush, and includes a motor case (yoke) 21 that forms the outline of the motor. The motor case 21 is formed into a bottomed cylindrical shape by pressing a steel plate that is a magnetic body, and a flange portion 21a through which the pair of fixing screws 11 are inserted is integrally provided on the opening side. As shown in FIG. 1, the motor case 21 includes a pair of flat portions 21 b (only shown on the upper side in the drawing) on the upper and lower sides thereof, and is formed so that the cross section has a substantially oval shape. The thickness of the rear wiper motor 10 is reduced by reducing the thickness along the vertical direction in the figure.

  As shown in FIG. 2, a total of four magnets 22 (only two are shown in the figure) having a substantially arc-shaped cross section are fixed inside the motor case 21. Each magnet 22 is made of, for example, a ferrite magnet, and is fixed at equal intervals (90 ° intervals) along the circumferential direction of the motor case 21. Inside each magnet 22, an armature (rotor) is interposed via a predetermined gap. ) 23 is rotatably accommodated. The proximal end side of the armature shaft (rotating shaft) 24 is fixed through the rotation center of the armature 23.

  A commutator (commutator) 25 is fixed to a substantially central portion along the axial direction of the armature shaft 24. The commutator 25 is formed into a substantially cylindrical shape by molding, for example, 18 segments (not shown). Is formed. An armature core 26 that forms the armature 23 is fixed to the proximal end side of the armature shaft 24, and the armature core 26 includes, for example, 18 slots (not shown). An armature coil 26 a is wound around each slot of the armature core 26 with a predetermined winding method and a predetermined number of turns. The coil end of the armature coil 26a is electrically connected to each segment.

  However, the number of segments and the number of slots of the motor unit 20 are not limited to 18 as described above, and can be arbitrarily changed according to torque characteristics and the like (specifications) required for the rear wiper motor 10.

  A plurality of power supply brushes (brushes) 25 a (only two are shown in the figure) are in sliding contact with each segment of the commutator 25. Each power supply brush 25a is movably provided in a brush holder 70 accommodated in the brush holder accommodating portion 34 of the gear case 31, and a drive current from the connector unit 50 is supplied to each power supply brush 25a. Yes. As described above, the motor unit 20 and the connector unit 50 are electrically connected via the power supply brushes 25a, the commutator 25, and the armature coil 26a, whereby an electromagnetic force is generated in the armature coil 26a, and the armature 23 (armature The shaft 24) rotates.

  The base end side of the armature shaft 24 is rotatably supported only by a radial bearing 27 provided at the bottom of the motor case 21, and between the base end side of the armature shaft 24 and the bottom of the motor case 21, A thrust bearing for supporting the armature shaft 24 from the axial direction is not provided. Here, the radial bearing 27 is formed in a substantially cylindrical shape by, for example, a sintered material, thereby having low noise, impact resistance, and self-lubricating properties, and further, abrasion powder is hardly generated. However, the radial bearing 27 may be formed of a plastic material having excellent heat resistance instead of the sintered material.

  A worm gear 24 a (not shown in detail) is integrally provided on the distal end side of the armature shaft 24, and the worm gear 24 a rotates in the gear case 31 as the armature shaft 24 rotates. The worm gear 24 a is formed in a spiral shape and meshes with the gear teeth 32 a of the worm wheel 32. Here, the worm gear 24a and the worm wheel 32 constitute a speed reduction mechanism. As the worm gear 24a (armature shaft 24) rotates, the worm wheel 32 rotates in a decelerated state than the worm gear 24a, and transmits the rotation reduced and increased in torque to the output shaft 33.

  Between the commutator 25 of the armature shaft 24 and the worm gear 24a, a bearing fixing portion 24b having a concavo-convex shape (a serration shape) toward the radial direction of the armature shaft 24 is formed. A ball bearing (bearing member) 28 is fixed to the bearing fixing portion 24b by press fitting. However, the ball bearing 28 is fixed to the bearing fixing portion 24b only by the pressing force when the ball bearing 28 is press-fitted into the armature shaft 24 without forming the uneven shape (serration shape) on the bearing fixing portion 24b. May be.

  The ball bearing 28 is sandwiched between a bearing fitting portion 36 of the gear case 31 and a stopper plate 60 attached to the gear case 31. As described above, the ball bearing 28 is fixed to the bearing fitting portion 36 of the gear case 31 while being fixed to the bearing fixing portion 24 b of the armature shaft 24, so that the armature shaft 24 is rotatably supported and is attached to the gear case 31. Movement in the axial direction and the radial direction is restricted.

  Thus, the ball bearing 28 has a function as a radial bearing and a thrust bearing. Therefore, a thrust bearing that supports the armature shaft 24 from the axial direction is not provided between the distal end side of the armature shaft 24 and the gear case 31.

  Here, since the rear wiper motor 10 is configured as a small four-pole motor, the amount of heat generated is larger than that of a large two-pole motor having the same output, for example. However, since thrust bearings are not provided at both ends of the armature shaft 24 in the axial direction, sliding loss of the armature shaft 24, that is, frictional resistance with the thrust bearing is eliminated, and an increase in excessive heat generation is suppressed. It is supposed to be.

  The bearing fitting portion 36 is provided in the vicinity of the connector unit housing portion 35 in the gear case 31 and opens toward the motor case 21 side. A ball bearing 28 is fitted to the bearing fitting portion 36 from the motor case 21 side. A through hole 37 is integrally formed in the bearing fitting portion 36, and the worm gear 24a of the armature shaft 24 passes through the through hole 37 when the rear wiper motor 10 is assembled.

  As shown in FIG. 3, the gear unit 30 includes a gear case (casing) 31 formed in a substantially bathtub shape by casting a molten aluminum material or the like. A bottom wall portion 31a is provided on one side along the depth direction of the gear case 31, and a side wall portion 31b is integrally provided on the bottom wall portion 31a. An opening 31 c is provided on the side opposite to the bottom wall 31 a side, that is, on the other side along the depth direction of the gear case 31. The opening 31c is closed by a bracket cover 80 shown in FIG. 1. From the opening 31c, the worm wheel 32, the connector unit 50, etc. (see FIG. 2) are placed in the gear case 31 in a predetermined order. Has been incorporated into.

  A brush holder accommodating portion 34 is integrally provided on the gear case 31 on the motor case 21 side (front side in the drawing). The brush holder accommodating portion 34 is formed in a cylindrical shape so as to extend along the axial direction of the armature shaft 24 (see FIG. 1), and the cross section thereof is formed in a substantially oval shape like the motor case 21. The brush holder housing part 34 includes an inner peripheral wall made up of a pair of arcuate wall parts 34a and a pair of linear wall parts 34b. Inside the brush holder housing part 34, the inside of the brush holder housing part 34 is provided. A brush holder 70 (see FIG. 7) formed in a substantially similar shape following the shape is accommodated.

  Here, four positioning protrusions 34c (only two are shown in the figure) are provided inside the brush holder housing 34 and in the vicinity of the connecting portion between each arcuate wall 34a and each linear wall 34b. It has been. Each positioning projection 34c enters each positioning recess (not shown) of the brush holder 70, so that the brush holder 70 can be positioned in the normal position within the brush holder housing 34 without rattling. ing. However, the four positioning protrusions 34c do not need to be provided. For example, two positioning protrusions 34c may be provided so as to face each other with the center portion of the brush holder accommodating portion 34 interposed therebetween.

  As shown in FIGS. 2 and 3, a connector unit housing portion 35 for housing the connector unit 50 adjacent to the brush holder housing portion 34 on the side opposite to the motor case 21 side of the brush holder housing portion 34 in the gear case 31. Are provided integrally. The connector unit housing portion 35 includes a motor case side wall portion 35a located on the motor case 21 side. A gear side wall 35b is provided on the side opposite to the motor case 21 so as to face the motor case side wall 35a. And between the motor case side wall part 35a and the gear side wall part 35b, the connector main-body part 51 (refer FIG. 4, 5) of the connector unit 50 is accommodated.

  A recess 35c is provided between the motor case side wall 35a and the gear side wall 35b, as shown in FIG. The hollow portion 35c forms a part of the bottom wall portion 31a of the gear case 31, and the second elastic deformation convex portions 51h (see FIGS. 4 and 5) of the connector unit 50 enter the hollow portion 35c. It has become. Thus, the connector unit 50 is accurately incorporated into the normal position of the connector unit housing portion 35 by aligning the second elastic deformation convex portions 51h so as to enter the recess portion 35c.

  As shown in FIGS. 2 and 3, the connector unit housing portion 35 includes a connector support portion 35 d that supports the connector connection portion 52 of the connector unit 50. The connector support portion 35d is formed in a bottomed box shape that is open on the same side as the opening side of the opening portion 31c. Thereby, when connecting the vehicle side external connector (not shown) to the connector connection part 52, the connector support part 35d supports the connector connection part 52 from the direction opposite to a connection direction. Therefore, it is possible to prevent the connector unit 50 from being subjected to a large load and prevent the connector unit 50 from being broken. Further, since the connector support portion 35d made of an aluminum material covers the periphery of the connector connection portion 52, it is possible to suppress the leakage of brush noise from the connector connection portion 52 to the outside.

  As shown in FIG. 2, a worm wheel 32 as a gear is rotatably accommodated in the gear case 31. The worm wheel 32 is formed in a substantially disk shape by injection molding a resin material such as plastic. Gear teeth 32a are integrally provided on the outer peripheral portion of the worm wheel 32, and the worm gear 24a is engaged with the gear teeth 32a. At the rotational center of the worm wheel 32, one end side in the axial direction of a wheel shaft 32b made of a steel rod having a circular cross section is rotatably provided, and the other axial end side of the wheel shaft 32b is provided at the bottom wall portion 31a of the gear case 31. (See FIG. 7).

  On the bottom wall 31a side of the worm wheel 32, a switching plate 32c made of a conductive steel plate is mounted as shown by the hatched portion in FIG. The switching plate 32c is formed in a substantially disk shape by pressing or the like, and includes a concave portion 32d that is recessed toward the radial inner side of the switching plate 32c and a convex portion 32e that protrudes toward the radial inner side. As the worm wheel 32 rotates, the tip ends of the three contact plates CP1 to CP3 provided in the connector unit 50 are in sliding contact with the switching plate 32c.

  As described above, the switching plate 32c having the concave portion 32d and the convex portion 32e is mounted on the worm wheel 32, and the contact plates CP1 to CP3 are provided so as to be in sliding contact with the switching plate 32c. A short circuit state (energized state) or a non-energized state is sent to an in-vehicle controller (not shown). Thus, the in-vehicle controller can detect the rotation state of the worm wheel 32, that is, the swing position of the wiper blade, and can stop the wiper blade at a predetermined stop position.

  As shown in FIG. 2, an output shaft 33 made of a steel rod having a circular cross section is arranged at a portion (left side in the drawing) of the gear case 31 away from the worm wheel 32, and the output shaft 33 is connected to the gear case 31. The boss portion 31e (see FIG. 1) provided on the bottom wall portion 31a is rotatably supported. The proximal end side of the output shaft 33 is provided in the gear case 31, and the distal end side (the back side in the drawing) of the output shaft 33 extends to the outside of the gear case 31. A base end portion of a wiper arm (not shown) is attached (fixed) to an extended portion (not shown) extending to the outside of the output shaft 33.

  In the gear case 31, a motion conversion mechanism 40 that converts the rotational motion R of the worm wheel 32 into the swing motion S of the output shaft 33 is provided between the worm wheel 32 and the output shaft 33. The motion conversion mechanism 40 includes a swing link 41 and a connecting member 42. Here, the connecting member 42 includes a connecting plate 42a and a sliding contact plate 42b.

  The swing link 41 is formed in a plate shape by punching a steel plate or the like, and one longitudinal end side of the swing link 41 is fixed to the base end side of the output shaft 33. On the other hand, the other end in the longitudinal direction of the swing link 41 is rotatably connected to one end in the longitudinal direction of the connecting plate 42a via the first connecting pin P1.

  The other end in the longitudinal direction of the connecting plate 42a is rotatably connected to a position eccentric from the rotation center of the worm wheel 32 via the second connecting pin P2. Here, the length dimension of the swing link 41 is set to be approximately half (approximately 1/2) the length dimension of the connecting plate 42a. The connecting plate 42a is also formed in a plate shape by punching a steel plate or the like in the same manner as the swing link 41.

  Thus, by providing the motion conversion mechanism 40 between the worm wheel 32 and the output shaft 33, the output shaft 33 can be swung in a predetermined angle range as the worm wheel 32 rotates in one direction. Yes. Specifically, the rotation of the worm gear 24a and the worm wheel 32 that has been decelerated and increased in torque is transmitted to the second connecting pin P2, and the second connecting pin P2 is centered on the wheel shaft 32b in the direction of the arrow R. Rotate. Then, the longitudinal direction other end side of the connection plate 42a also rotates around the wheel shaft 32b, and thereby the longitudinal direction one end side of the connection plate 42a is regulated by the swing link 41 via the first connection pin P1. Oscillates in the direction of arrow S about the output shaft 33.

  The sliding contact plate 42b is formed in a plate shape from a resin material such as plastic having excellent self-lubricating properties, and is attached to the bracket cover 80 side (the front side in the figure) of the connecting plate 42a. A slidable contact portion 42c that is slidably contacted with the bracket cover 80 (see FIG. 1) is integrally provided at a central portion in the longitudinal direction of the slidable contact plate 42b, and grease (not shown) is applied to the slidable contact portion 42c. Yes. Accordingly, the motion conversion mechanism 40 is smoothly operated in the gear case 31 and the motion conversion mechanism 40 is prevented from rattling along the axial direction of the output shaft 33.

  As shown in FIGS. 4 and 5, the connector unit 50 is formed into a predetermined shape by injection molding a resin material such as plastic, and is formed into a connector body portion 51 formed in a plate shape and a box shape with a bottom. Connector connecting portion 52. The connector main body 51 is disposed between the motor case side wall 35a and the gear side wall 35b (see FIG. 2) of the connector unit housing 35, and the connector connection 52 is a connector support 35d of the connector unit housing 35. (See FIG. 2).

  A through hole 51 a through which the armature shaft 24 (see FIG. 2) passes is formed in a substantially central portion of the connector main body 51. The inner diameter of the through hole 51a is set to be slightly larger than the outer diameter of the ball bearing 28 (see FIG. 2). As a result, the armature shaft 24 having the ball bearing 28 can pass through the connector main body 51 when the rear wiper motor 10 is assembled.

  A contact plate support portion 51b is integrally provided on the opposite side of the through hole 51a from the connector connection portion 52 side. The contact plate support 51b is formed so as to protrude in the thickness direction of the connector main body 51 (the axial direction of the armature shaft 24). Three contact plates CP1 to CP3 are mounted on the contact plate support 51b, and each contact plate CP1 to CP3 is one side of the connector body 51 in the short direction (lower side in FIG. 4, lower side in FIG. 5). From above, the contact plate support 51b is inserted and fixed. Here, each contact plate CP1, CP2 is integrally provided with a locking claw (not shown), and each of the locking claw can be hooked on the side surface of each third elastic deformation convex portion 51i. The contact plates CP1 and CP2 are attached to the contact plate support 51b with one touch.

  A pair of female terminals TM2 through which a drive current from an external connector flows is provided on the connector connecting portion 52 side of the through hole 51a. The proximal end side of each male terminal TM1 whose distal end side is exposed in the connector connecting portion 52 is electrically connected to the proximal end side of each female terminal TM2 by spot welding or the like. In the assembled state of the rear wiper motor 10, each brush holder side male terminal TM3 (see FIG. 7) provided in the brush holder 70 is inserted into the distal end side of each female terminal TM2.

  Here, each brush holder-side male terminal TM3 of the brush holder 70 is connected to each female terminal TM2 from a direction intersecting (orthogonal) with the connection direction of the external connector to the connector connecting portion 52. (See FIG. 7). Thereby, when connecting an external connector to the connector connection part 52, the electrical connection between each brush holder side male terminal TM3 and each female terminal TM2 is prevented from loosening.

  An insertion guide hole 51c that penetrates in the thickness direction of the connector main body 51 is provided in the vicinity of the through hole 51a of the connector main body 51. The insertion guide protrusion 71 of the brush holder 70 is inserted into the insertion guide hole 51c. (See FIG. 7) is inserted. Thereby, the mechanical and electrical connection between the connector unit 50 and the brush holder 70 can be reliably performed inside the brush holder accommodating portion 34.

  Furthermore, between each contact plate CP1-CP3 of the connector main body 51, and each male terminal TM1 and each female terminal TM2, a plurality of jumper wires JP (1 in the drawing) are provided so as to straddle the through holes 51a. Is shown).

  As shown in FIG. 4, the front side surface 51d along the short direction (vertical direction in the figure) of the connector main body 51, that is, the connector main body 51 opposite to the bracket cover 80 (see FIG. 1) A pair of first elastic deformation convex portions (contact convex portions) 51e and 51f extending along the thickness direction of the main body 51 (the axial direction of the armature shaft 24) is provided.

  Each of the first elastic deformation convex portions 51e and 51f is formed in a substantially narrow line shape, and is provided so as to protrude from the front side surface 51d at a minute height (about 1 mm). One first elastic deformation convex portion 51e is provided near the contact plate support portion 51b, and the other first elastic deformation convex portion 51f is provided near the connector connecting portion 52. Here, the pair of first elastic deformation convex portions 51e and 51f is provided, but this is more stable with respect to the bracket cover 80 than when three first elastic deformation convex portions are provided. This is because it can abut (without rattling).

  In this way, by forming the first elastic deformation convex portions 51e and 51f to be substantially linear and at a minute height, the rigidity is weaker than the other portions of the connector main body 51, and consequently elastic deformation is possible. ing. Then, as shown in FIG. 1, when the bracket cover 80 is attached to the gear case 31, the inside of the bracket cover 80 is brought into contact with the tops of the first elastic deformation convex portions 51e and 51f, By tightening each fixing screw 12 with a predetermined tightening torque, each first elastic deformation convex portion 51e, 51f is elastically deformed and is in close contact with the bracket cover 80.

  Thereby, each 1st elastic deformation convex part 51e, 51f absorbs the dimensional error of the connector unit 50 or the connector unit accommodating part 35, and also suppresses the backlash with respect to the gear case 31 of the connector unit 50. FIG. .

  However, each 1st elastic deformation convex part 51e, 51f of the connector main-body part 51 is abbreviate | omitted, and the shape similar to each 1st elastic deformation convex part 51e, 51f is provided in the opposing part with the connector main-body part 51 of the bracket cover 80. These two convex portions (not shown) may be formed. In this case, each convex portion provided on the bracket cover 80 becomes an abutting convex portion in the present invention, and each convex portion of the bracket cover 80 is partially pressed against the connector main body 51 so that each convex portion made of a steel plate is formed. Bites into the connector main body 51 made of resin. Thereby, the backlash with respect to the gear case 31 of the connector unit 50 can be suppressed, absorbing the dimensional error of the connector unit 50 or the connector unit accommodating part 35 similarly to the above.

  In addition, you may provide both each 1st elastic deformation convex part 51e, 51f of the connector main-body part 51, and each convex part of the bracket cover 80, In this case, a dimensional error absorption function and a rattling suppression function are improved. Therefore, for example, it is desirable to arrange the first elastic deformation convex portions 51e and 51f and the convex portions of the bracket cover 80 alternately.

  As shown in FIG. 5, there are two second side surfaces 51g along the short side direction (vertical direction in the drawing) of the connector body 51, that is, the portion facing the recess 35c (see FIG. 3) of the gear case 31. Elastic deformation convex portions 51h are provided. Each second elastic deformation convex portion 51h is elastically deformed when the bracket cover 80 is attached to the gear case 31, like the first elastic deformation convex portions 51e and 51f. That is, each second elastic deformation convex portion 51h is also elastically deformed inside the hollow portion 35c to absorb the dimensional error of the connector unit 50 and the connector unit housing portion 35, and further to the gear case 31 of the connector unit 50. It is designed to suppress rattling.

  Thus, by attaching the bracket cover 80 to the gear case 31, the bracket cover 80 closes the opening 31c of the gear case 31, and the first elastic deformation convex portions 51e and 51f provided in the connector unit 50 and the respective portions. The connector unit 50 is sandwiched between the second elastic deformation convex portion 51 h and the bottom wall portion 31 a of the gear case 31 while being elastically deformed.

  Each second elastic deformation convex part 51h forms an L-shaped concave part 51h1, and each positioning protrusion 34c (see FIG. 3) of the gear case 31 enters into each L-shaped concave part 51h1. ing. Thereby, the connector unit 50 is positioned with respect to the gear case 31 with high accuracy.

  In addition, a pair of third elastic deformation convex portions 51i are provided on the back side surface 51g side along the short side direction of the connector main body portion 51 and on the contact plate support portion 51b side. Further, three fourth elastic deformation convex portions 51j are provided on the back side surface 51g side along the short side direction of the connector main body portion 51 and on the connector connection portion 52 side.

  The third elastic deformation convex portions 51i and the fourth elastic deformation convex portions 51j are elastically deformed together with the first elastic deformation convex portions 51e and 51f and the second elastic deformation convex portions 51h. This also stabilizes the connector unit 50 within the gear case 31 without rattling. Here, each 4th elastic deformation convex part 51j supports each male type terminal TM1 exposed in the connector connection part 52 from the connection direction of an external connector. That is, each 4th elastic deformation convex part 51j is also provided with the function which prevents that each male type terminal TM1 deform | transforms.

  On one side surface (see FIG. 4) and the other side surface (see FIG. 5) along the axial direction of the through hole 51a of the connector main body 51, there are a plurality of abutting parts on the gear side wall 35b and the motor case side wall 35a of the gear case 31, respectively. A fifth elastic deformation convex portion 51k and a sixth elastic deformation convex portion 51m are provided. Each fifth elastic deformation convex portion 51k and each sixth elastic deformation convex portion 51m are also elastically deformed, so that the connector unit 50 is stabilized without rattling inside the gear case 31.

  As shown in FIG. 1, the bracket cover 80 as a cover member is formed into a predetermined shape by pressing a steel plate, and includes a main body portion 81 and three fixing portions 82. The main body 81 closes the opening 31c of the gear case 31, holds the connector unit 50 with the bottom wall 31a (see FIGS. 2 and 3) of the gear case 31, and further moves the motion converting mechanism 40. The slidable contact portion 42c (see FIG. 2) that forms a slidable contact is formed.

  Each fixing portion 82 is integrally provided so as to protrude from the periphery of the main body portion 81 to the outer peripheral side, and each fixing portion 82 has a bolt mounting portion 82a formed by cutting out a part thereof and having a substantially C shape. Each is provided. A fixing bolt (not shown) for fixing the rear wiper motor 10 to a rear hatch or the like (an object to be fixed) is attached to each bolt mounting portion 82a via a rubber bush (not shown). It has become. Thereby, the vibration of the rear wiper motor 10 is hardly transmitted to the vehicle, and the quietness is improved.

  As shown in FIG. 7, the brush holder 70 is formed into a predetermined shape by injection molding a resin material such as plastic, and is accommodated in the brush holder accommodating portion 34 of the gear case 31. In addition to each power supply brush 25a (see FIG. 2), a plurality of electronic components EP such as a choke coil and a capacitor (only one is shown in the drawing) are mounted on the brush holder 70.

  Each electronic component EP is configured to suppress, for example, the radiation of brush noise generated when each power supply brush 25a is in sliding contact with the commutator 25 (see FIG. 2). A pair of brush holder-side male terminals TM3 and insertion guide protrusions 71 are provided on the front end side in the mounting direction of the brush holder 70 to the brush holder accommodating portion 34 so as to protrude toward the connector unit 50. .

  Also in the brush holder 70, a through hole (not shown) through which the armature shaft 24 (see FIG. 2) passes is formed at the center portion, and the inner diameter of the through hole is the same as that of the through hole 51a. The dimension is set to be slightly larger than the outer diameter of 28 (see FIG. 2). Thereby, the armature shaft 24 provided with the ball bearing 28 can pass through the brush holder 70 when the rear wiper motor 10 is assembled.

  Next, assembly procedures 1 to 4 of the rear wiper motor 10 formed as described above will be described in detail with reference to the drawings.

  FIG. 7 is an explanatory diagram for explaining the mounting procedure (assembly procedure 1) of the connector unit and the brush holder to the gear case, and FIG. 8 is an explanatory diagram for explaining the mounting procedure (assembly procedure 2) of the motor unit to the gear case. 9 is an explanatory diagram for explaining a procedure for mounting the worm wheel and the motion conversion mechanism to the gear case (assembly procedure 3), and FIG. 10 is an explanatory diagram for explaining a procedure for mounting the bracket cover to the gear case (assembly procedure 4). Represents.

[Preparation process]
First, as shown in FIGS. 7 to 10, a gear case 31 cast and molded in another manufacturing process, and a connector unit 50 and a brush holder 70 assembled in another assembling process are prepared. Further, after the connector unit 50 and the brush holder 70 are assembled, the worm wheel 32, the motion conversion mechanism 40, the stopper plate 60, the motor unit 20, the bracket cover 80, and the like that are assembled to the gear case 31 are prepared.

[Assembly procedure 1]
As shown in FIG. 7, the connector unit 50 is made to face the connector unit housing portion 35 from the opening 31 c side (the upper side in the drawing) of the gear case 31. At this time, the second elastic deformation convex portions 51h (see FIG. 5) of the connector unit 50 are made to face each other so as to enter the recess portion 35c (see FIG. 3) of the connector unit housing portion 35. Thereafter, as indicated by the arrow (1), the connector unit 50 is accommodated in the connector unit accommodating portion 35 by the manual operation of the operator or the automatic operation of the assembling apparatus.

  Thus, the connector main body 51 is disposed between the motor case side wall 35a and the gear side wall 35b forming the connector unit housing 35 (see FIG. 2), and the connector connection 52 is connected to the connector support 35d. Arranged inside. Furthermore, each 2nd elastic deformation convex part 51h is arrange | positioned inside the hollow part 35c.

  Thus, the connector unit 50 is accommodated in the connector unit accommodating portion 35, and the contact plates CP1 to CP3 of the connector unit 50 are disposed on the worm wheel 32 side (wheel shaft 32b side). The connection side (side shown in FIG. 5) of the terminal TM2 is arranged on the brush holder 70 side.

  Next, the brush holder 70 is caused to face the opening of the brush holder housing portion 34 from the motor portion 20 side (right side in the drawing) of the gear case 31. At this time, the side from which each brush holder side male terminal TM3 and the insertion guide convex portion 71 of the brush holder 70 protrude is directed to the opening of the brush holder housing portion 34. Thereafter, the brush holder 70 is accommodated in the brush holder accommodating portion 34 from the direction indicated by the arrow (2) intersecting (orthogonal) with the accommodating direction of the connector unit 50 by the manual operation of the operator or the automatic operation of the assembling apparatus.

  Here, the insertion guide protrusion 71 of the brush holder 70 is inserted into the insertion guide hole 51 c (see FIG. 5) of the connector unit 50. Thereby, the incorrect assembly | attachment with respect to the brush holder accommodating part 34 and the connector unit 50 of the brush holder 70 is prevented reliably.

  When the housing operation of the brush holder 70 into the brush holder housing portion 34 proceeds, first, the insertion guide convex portion 71 enters the insertion guide hole 51 c, and then each brush holder side male inside the brush holder housing portion 34. A mold terminal TM3 is connected to each female terminal TM2. As a result, the brush holder 70 and the connector unit 50 are mechanically and electrically connected, and the drive current from the connector unit 50 can flow to the motor unit 20 via the brush holder 70.

  Thereafter, each positioning projection 34 c (see FIG. 3) of the brush holder housing part 34 enters each positioning recess (not shown) of the brush holder 70, whereby the brush holder 70 is placed inside the brush holder housing part 34. It will be positioned at the normal position without rattling.

[Assembly procedure 2]
Next, the motor unit 20 (see FIG. 2) in a state where the four magnets 22 are fixed to the motor case 21 and the armature shaft 24 with the commutator 25, the ball bearing 28 and the like assembled thereon is assembled with the arrow (3 in FIG. ) From the direction shown in FIG. At this time, the worm gear 24 a side (see FIG. 2) extending from the motor case 21 of the motor unit 20 is directed toward the brush holder housing unit 34.

  Then, the worm gear 24a and the ball bearing 28 are inserted through the through hole of the brush holder 70 and the through hole 51a (see FIGS. 4 and 5) of the connector unit 50. Thereafter, the motor unit 20 is further moved toward the gear case 31, whereby the worm gear 24 a is inserted through the through hole 37 (see FIG. 2) of the gear case 31.

  Here, each power supply brush 25a (see FIG. 2) provided in the brush holder 70 moves from a position retracted with respect to the commutator 25 toward a position advanced with the mounting of the commutator 25, whereby the connector unit. 50 and the motor unit 20 are electrically connected via the brush holder 70.

  Thereafter, the motor unit 20 is further moved with respect to the gear case 31 so that the flange portion 21 a of the motor case 21 is brought into contact with the brush holder housing 34. Thereby, the ball bearing 28 is fitted to the bearing fitting portion 36. Then, using a fastening tool (such as an electric screwdriver) (not shown), each fixing screw 11 is tightened with a predetermined tightening torque as indicated by an arrow (4).

  Next, the stopper plate 60 is inserted in the vicinity of the bearing fitting portion 36 of the gear case 31 so as to face the radial direction of the armature shaft 24 as indicated by an arrow (5). Accordingly, the stopper plate 60 presses the ball bearing 28 while being elastically deformed, and the ball bearing 28 is firmly fixed to the bearing fitting portion 36 (see FIG. 2).

[Assembly procedure 3]
Next, as shown by an arrow (6) in FIG. 9, the worm wheel 32 is accommodated in the gear case 31 from the opening 31c, and the output shaft 33 to which the swing link 41 is fixed is accommodated in the gear case 31 from the opening 31c. To do. Here, as shown in FIG. 6, the side on which the switching plate 32c of the worm wheel 32 is mounted is made to face the contact plates CP1 to CP3.

  Thereafter, the connecting plate 42a and the sliding contact plate 42b are mounted between the swing link 41 and the worm wheel 32 in that order, whereby the mounting of each component in the gear case 31 is completed.

[Assembly procedure 4]
Next, as shown by an arrow (7) in FIG. 10, the bracket cover 80 faces the opening 31 c of the gear case 31, and the opening 31 c is covered with the bracket cover 80. Thereafter, as shown by an arrow (8), the bracket cover 80 is fixed to the gear case 31 using the four fixing screws 12. Here, each fixing screw 12 is tightened to a predetermined tightening torque by the same fastening tool (electric screwdriver or the like) that tightens each fixing screw 11 (see FIG. 8). However, each fixing screw 12 may be tightened by using a fastening tool different from that for tightening each fixing screw 11.

  As a result, the first elastic deformation convex portions 51e and 51f and the second elastic deformation convex portions 51h are elastically deformed, and the connector unit 50 (connector body portion) is interposed between the bottom wall portion 31a of the gear case 31 and the bracket cover 80. 51) and the connector unit 50 is housed in a stable state without rattling with respect to the gear case 31. In this way, the rear wiper motor 10 is completed. Here, the bracket cover 80 does not block the connector connecting portion 52.

  As described above in detail, according to the rear wiper motor 10 according to the first embodiment, the connector unit 50 having the connector connecting portion 52 and the contact plates CP1 to CP3 is connected to the opening 31c of the gear case 31 by the bracket cover 80. By closing, it is clamped between the bracket cover 80 and the bottom wall portion 31 a of the gear case 31. Accordingly, the connector unit 50 can be fixed in the gear case 31 by housing the connector unit 50 together with the worm wheel 32 from the opening 31 c of the gear case 31 in the gear case 31 and closing the opening 31 c with the bracket cover 80. As a result, the number of fixing screws can be reduced as compared with the prior art, and the assembly process of the rear wiper motor 10 can be simplified.

  Further, according to the rear wiper motor 10 according to the first embodiment, the bracket cover 80 is provided with the fixing portion 82 for fixing the rear wiper motor 10 to the rear hatch or the like. The rear wiper motor 10 can be fixed to a rear hatch or the like.

  Furthermore, according to the rear wiper motor 10 according to the first embodiment, since the bracket cover 80 is formed by pressing a steel plate, the bracket cover 80 can be easily formed. Electric noise can be prevented from being transmitted to the outside.

  Further, according to the rear wiper motor 10 according to the first embodiment, the first elastically deforming convex portions 51e and 51f that contact the bracket cover 80 are provided on the portion of the connector unit 50 facing the bracket cover 80. Compared with the case where both are brought into contact with each other in a plane, both can be brought into contact with each other stably, and the generation of noise can be suppressed.

  Furthermore, according to the rear wiper motor 10 according to the first embodiment, the sliding contact portion that slides on the bracket cover 80 on the sliding contact plate 42 b that forms the connecting member 42 provided between the worm wheel 32 and the output shaft 33. Since 42c is provided, the bracket cover 80 can suppress blurring of the connecting member 42 when the rear wiper motor 10 is rotationally driven, and thus noise generation can be suppressed.

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

  FIG. 11 is an enlarged plan view showing the gear portion of the rear wiper motor according to the second embodiment.

  As shown in FIG. 11, the rear wiper motor (motor device) 90 according to the second embodiment has a position and motion of the output shaft 33 as compared with the rear wiper motor 10 (see FIG. 2) according to the first embodiment. The structure of the conversion mechanism 100 is different.

  The output shaft 33 of the rear wiper motor 90 is disposed on the side opposite to the armature shaft 24 side with the worm wheel 32 of the gear case 91 interposed therebetween. Thereby, in the rear wiper motor 90, the dimension along the axial direction of the armature shaft 24 can be reduced as compared with the first embodiment.

  The motion conversion mechanism 100 of the rear wiper motor 90 includes a pinion gear 101, a motion conversion member 102, a connecting plate 42a, and a sliding contact plate 42b. The pinion gear 101 is fixed to the proximal end side of the output shaft 33 and swings with the output shaft 33.

  The motion conversion member 102 includes a sector gear 102a that meshes with the pinion gear 101, and an arm portion 102b that is rotatably connected to an eccentric position of the worm wheel 32 via a second connection pin P2. A first connecting pin P1 is provided at the central portion of the sector gear 102a, and a connecting plate 42a is provided between the first connecting pin P1 and the output shaft 33. Specifically, one end in the longitudinal direction of the connecting plate 42a is rotatably connected to the proximal end of the output shaft 33, and the other end in the longitudinal direction of the connecting plate 42a is rotatably connected to the first connecting pin P1. Has been.

  Thus, the connecting plate 42a according to the present embodiment keeps the distance between the output shaft 33 and the first connecting pin P1 constant, and maintains the meshing between the pinion gear 101 and the sector gear 102a.

  Also in the motion converting mechanism 100 of the rear wiper motor 90, the rotational motion of the worm wheel 32 is converted into the swing motion of the output shaft 33. Specifically, when the second connecting pin P2 rotates about the wheel shaft 32b with the rotation of the worm wheel 32 (see the two-dot chain line arrow R), the arm portion 102b of the motion converting member 102 also centers on the wheel shaft 32b. Rotate. As a result, the sector gear 102a swings about the first connecting pin P1, and as a result, the pinion gear 101 that meshes with the sector gear 102a, that is, the output shaft 33 swings (see the two-dot chain line arrow S).

  As described in detail above, the rear wiper motor 90 according to the second embodiment can achieve the same operational effects as those of the first embodiment described above.

  It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, in each of the above-described embodiments, the cover member of the present invention adopts a bracket cover 80 formed by pressing a steel plate. However, the present invention is not limited to this, and an aluminum material is cast and formed. You may employ | adopt the cover member formed by doing.

  In each of the above embodiments, the bracket cover 80 is provided with the three fixing portions 82. However, the present invention is not limited to this, and the number of fixing portions may be four or more, for example. In short, it may be set according to the shape of the fixed object such as a rear hatch.

  Further, in each of the above embodiments, the connector unit 50 includes the first elastic deformation convex portions 51e and 51f (two), the second elastic deformation convex portions 51h (two), and the third elastic deformation convex portions 51i (2). ), Fourth elastic deformation convex portions 51j (three), fifth elastic deformation convex portions 51k (three) and sixth elastic deformation convex portions 51m (10) are shown. However, the number of elastic deformation convex portions and the positions where they are provided may be appropriately changed according to the flexibility of the material forming the connector unit 50, the tightening torque of each fixing screw 12, and the like. Absent.

  In each of the above-described embodiments, the reduction mechanism (worm reduction device) including the worm gear 24a and the worm wheel 32 is used. Can also be adopted. In this case, for example, the sun gear may be an input gear and the ring gear may be an output gear. That is, these sun gear, ring gear, and the like constitute the gear of the present invention.

  Further, in each of the embodiments described above, the rear wiper motor 10 is shown as the motor device. However, the present invention is not limited to this, and a power window device, an electric sunroof device, an electric motor mounted on a vehicle such as an automobile. The present invention can also be applied to a motor device used as a drive source for a sheet device or the like.

10 Rear wiper motor (motor device)
DESCRIPTION OF SYMBOLS 11, 12 Fixing screw 20 Motor part 21 Motor case 21a Flange part 21b Plane part 22 Magnet 23 Armature 24 Armature shaft 24a Worm gear 24b Bearing fixing part 25 Commutator 25a Power supply brush 26 Armature core 26a Armature coil 27 Radial bearing 28 Ball bearing 30 Gear part 31 gear case 31a bottom wall 31b side wall 31c opening 31e boss 32 worm wheel (gear)
32a Gear teeth 32b Wheel shaft 32c Switching plate 32d Concave 32e Convex 33 Output shaft 34 Brush holder housing part 34a Arc wall part 34b Linear wall part 34c Positioning projection 35 Connector unit housing part 35a Motor case side wall part 35b Gear side wall part 35c Recessed portion 35d Connector support portion 36 Bearing fitting portion 37 Through hole 40 Motion conversion mechanism 41 Oscillating link 42 Connection member 42a Connection plate 42b Slide contact plate 42c Slide contact portion 50 Connector unit 51 Connector body portion 51a Through hole 51b Contact plate support Part 51c Insertion guide hole 51d Front side surface 51e, 51f First elastic deformation convex part ( first contact convex part)
51g Back side 51h Second elastic deformation convex part (second contact convex part)
51i 3rd elastic deformation convex part 51j 4th elastic deformation convex part (3rd contact convex part)
51k 5th elastic deformation convex part (4th contact convex part)
51m 6th elastic deformation convex part (5th contact convex part)
51h1 L-shaped concave part 52 Connector connecting part 60 Stopper plate 70 Brush holder 71 Insertion guide convex part 80 Bracket cover (cover member)
81 Body portion 82 Fixing portion 82a Bolt mounting portion 90 Rear wiper motor (motor device)
91 gear case 100 motion conversion mechanism 101 pinion gear 102 motion conversion member 102a sector gear 102b arm portion CP1 to CP3 contact plate EP electronic component JP jumper wire P1 first connection pin P2 second connection pin TM1 male terminal TM2 female terminal TM3 brush holder side Male terminal

Claims (6)

A motor device comprising a motor unit having a rotating shaft and a gear unit having a gear for transmitting rotation of the rotating shaft to an output shaft,
A gear case having a bottom wall part on one side and an opening part on the other side, in which the gear is rotatably accommodated;
And it provided et the connector unit in the gear case,
A connector connecting portion provided in the connector unit, the periphery of which is covered by the gear case, and to which an external connector is connected;
A contact plate provided in the connector unit for detecting a rotation state of the gear by sliding contact with a switching plate provided in the gear;
A cover member that closes the opening and sandwiches the connector unit with the bottom wall ;
Equipped with a,
The connector unit is formed with a first abutting convex portion provided at a portion facing the cover member and a second abutting convex portion provided at a portion facing the bottom wall portion. The motor device characterized by the above-mentioned. The motor device according to claim 1, wherein a third abutting convex portion is provided on a portion of the connector connecting portion facing the bottom wall portion. 3. The motor device according to claim 1, wherein a fourth abutting convex portion and a fifth abutting portion are provided on a portion of the connector unit facing the gear case on one side surface and the other side surface along the axial direction of the rotation shaft. A motor device, wherein each of the protrusions is provided. The motor apparatus according to any one of claims 1 to 3, the cover member, the motor apparatus characterized in that a fixing part for fixing the motor unit to the stationary object. 5. The motor device according to claim 1, wherein the cover member is formed by pressing a steel plate. The motor apparatus according to any one of claims 1 to 5 motors, characterized in that the connecting member provided between the output shaft and the gear, providing a sliding contact portion in sliding contact with the cover member apparatus.

Images