JP2015133842A - starter motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent rotation of a brush holder in screw fastening, and to prevent reduction in insulation properties due to rotation of a terminal in screw fastening.SOLUTION: A starter motor 1 includes a bracket 6, a power feeding terminal 27 attached to the bracket 6 and a brush holder 25 fixed in the bracket 6. In the brush holder 25, a - side brush 24a connected to the bracket 6 and a + side brush 24b connected to the power feeding terminal 27 are stored. The - side brush 24a is connected to a terminal 32a and fixed on the bracket 6 together with the brush holder 25 and the + side brush 24b is connected to a terminal 32b and fixed on the power feeding terminal 27 by a screw 33b. A butting portion 41 is projectively formed on an inner peripheral wall 39 of the bracket 6, and when the brush holder 25 is rotated by fastening the screw 33a, the butting portion is abutted on the butting face 42 of the brush holder 25 to regulate rotation of the brush holder 25.

Description

  The present invention relates to a starter motor mounted for starting an engine of an automobile or the like, and more particularly to a starter motor suitable for use in a motorcycle having a displacement of 200 cc or less.

  2. Description of the Related Art In recent years, there are many motorcycles that perform a starting operation with a starter motor when starting an engine, even in small vehicles with a small displacement. Among such starter motors, for example, those used for motorcycles with a displacement of 200 cc or less are commonly used on a global basis with a 2-pole 10-12-slot lap armature specification.

  However, such a multi-winding starter motor is highly versatile, but the winding order to each slot is always the adjacent slot, so the core slot area is effective from the beginning to the end of winding. There is a problem that it cannot be used. In this case, in order to improve the space factor of the winding, there is a means for wrapping the thin wires twice, but the winding time is doubled, which is a factor that hinders productivity. Further, in the case of the two-pole / overlapping specification, since the brushes are arranged so as to face each other by 180 °, there is a problem in workability when assembling the armature to the bracket, such as processing of a spring when the motor is assembled.

  Therefore, in order to solve the above-mentioned problems, the present applicant has proposed a starter motor that uses a quadrupole magnet and uses a coil with a wave winding specification to reduce the thickness of the magnet and improve the coil space factor. (Patent Document 2). With the starter motor of Patent Document 2, it is possible to arrange the brushes at 90 ° intervals with the quadrupole, improving the ease of assembling the brushes, and reducing the size of the brush holder by changing the arrangement. ing. In addition, the number of parts has been reduced by revising the structure in which the brush holder is conventionally fixed to the bracket with two screws and by fixing the brush holder with one screw. Furthermore, in the starter motor of Patent Document 2, the power supply terminal is press-fitted and fixed to reduce the number of parts, and the connection between the terminal and the brush pigtail is screwed instead of the conventional spot welding. This improves the workability when installing the terminal.

JP 2010-136500 A Japanese Patent Application No. 2012-281888

  However, if the brush holder is downsized and fixed to the bracket with a single screw as in the starter motor of Patent Document 2, the brush holder may rotate with the screw as the screw is tightened. . When the brush holder rotates, the position of the brush holder is not fixed, and there is a problem that the brush holder cannot be positioned in a predetermined state. Further, since the connection between the power feeding terminal and the pigtail is screwed, there is a risk that the terminal on the pigtail side will rotate as the screw is tightened. In this case, when the pigtail side terminal rotates and contacts the bracket, there is a problem that the insulation of the terminal is impaired, and a countermeasure for this is required.

  An object of the present invention is to provide a starter motor that prevents rotation of a brush holder during screw tightening and can easily and reliably position the brush holder in a predetermined state. Another object of the present invention is to prevent deterioration in insulation due to rotation of a terminal during screw tightening and to improve product reliability.

  The starter motor of the present invention includes a metal bracket, a power supply terminal attached to the bracket, a first brush housed and fixed in the bracket and electrically connected to the bracket, and the power supply terminal. A brush holder in which a second brush electrically connected is accommodated; a first terminal electrically connected to the brush holder electrically and mechanically via the first brush and a pigtail; A first fastening member that fastens the first terminal and the brush holder, a second brush that is electrically connected via the pigtail and the second terminal that is electrically and mechanically connected to the power supply terminal. A starter motor comprising: a terminal; and a second fastening member that fastens the second terminal and the power feeding terminal, wherein the starter motor includes the brush Characterized in that it has a rotation regulating portion for regulating a rotation of the holder.

  In the starter motor of the present invention, the rotational movement of the brush holder housed and fixed in the bracket is suppressed by the rotation restricting portion. Therefore, the brush holder is positioned in a predetermined state at a predetermined position of the bracket without using a special jig or the like or adding another part.

  In the starter motor, as the rotation restricting portion, there are provided an abutting portion formed on the inner periphery of the bracket and an abutting surface formed on the brush holder and facing the abutting portion in the circumferential direction. Also good. Moreover, you may provide the abutting part formed in the outer periphery of the said brush holder and the abutting surface formed in the said bracket and facing the said abutting part toward the circumferential direction as the said rotation control part. Furthermore, as the rotation restricting portion, an abutting portion formed on the bottom portion of the brush holder and an abutting surface formed on the bracket and facing the abutting portion in the circumferential direction may be provided. In addition, as the rotation restricting portion, an abutting portion formed on the bottom surface portion of the bracket and an abutting surface formed on the brush holder and facing the abutting portion in the circumferential direction may be provided. . In the starter motor, the brush holder rotates about the first fastening member, and the rotation restricting portion restricts the rotation of the brush holder in the fastening rotation direction of the first fastening member. good.

  On the other hand, in the starter motor, an insulating portion may be provided between the second terminal and the inner peripheral wall of the bracket. As a result, the second terminal and the bracket are insulated from each other, a short circuit between the second terminal and the bracket can be prevented, and the product reliability can be improved. In this case, an insulating wall formed integrally with the brush holder and disposed between the second terminal and the inner peripheral wall of the bracket may be provided as the insulating portion. The second fastening member may be rotated in the fastening rotation direction, and when the second terminal rotates in the rotation direction together with the second fastening member, the second terminal may contact the insulating wall. This prevents the second terminal from rotating. Further, the insulating wall may be disposed between the pigtail connected to the second brush and the inner peripheral wall of the bracket, whereby the pigtail and the bracket of the second brush are insulated from each other. The short circuit between the bracket and the bracket can be prevented, and the product reliability can be improved.

  Further, the brush holder may be provided with a positioning portion that defines an attachment position of the brush holder with respect to the bracket. In this case, the positioning unit may be provided by extending the brush holder in the circumferential direction.

  Furthermore, in the starter motor, the brush holder is formed in a substantially fan shape with a central angle of less than 180 °, at which the first and second brushes can be arranged at intervals of about 90 °, and the brush holder is provided with the first brush. A first brush accommodating portion for accommodating the second brush accommodating portion for accommodating the second brush, and a distance between an attachment position of the first fastening member and the first brush accommodating portion, You may set the distance between the attachment position of a said 2nd fastening member, and the said 2nd brush accommodating part substantially equal. In this case, the second brush housing portion is disposed between the first fastening member and the second fastening member, and the first terminal is disposed between the second brush housing portion and the first brush housing portion. You may make it arrange | position to.

  According to the starter motor of the present invention, the starter motor having the bracket and the brush holder housed and fixed in the bracket is provided with the rotation restricting portion for restricting the rotation of the brush holder. Can be suppressed by the rotation restricting portion. Therefore, the brush holder can be positioned at a predetermined position of the bracket in a predetermined state without using a special jig or the like or adding another part. Therefore, the brush holder can be positioned and fixed to the bracket easily and reliably, and the number of parts and the number of assembling steps can be reduced.

  Further, by providing an insulating portion between the second brush connected to the power supply terminal and the inner peripheral wall of the bracket, the second terminal and the bracket are insulated from each other, and the second terminal and the bracket are prevented from being short-circuited. Is possible. In this case, as the insulating portion, an insulating wall disposed between the second terminal and the inner peripheral wall of the bracket is provided, and the second terminal comes into contact with the insulating wall when the second fastening member is rotated in the fastening rotation direction. By arranging the insulating wall as described above, the second terminal can be prevented from rotating.

It is sectional drawing which shows the structure of the starter motor which is one embodiment of this invention. It is the side view which looked at the armature core from the axial direction. It is explanatory drawing which shows the coil | winding specification of an armature coil. It is explanatory drawing which shows the arrangement | positioning state of a brush. It is explanatory drawing which shows the structure of the brush holder currently used for the starter motor of FIG. It is explanatory drawing which shows the structure of the conventional brush holder. It is explanatory drawing which shows the structure of the bracket currently used for the starter motor of FIG. It is explanatory drawing which shows the rotation prevention and insulation structure of a terminal. It is explanatory drawing which shows the modification of the rotation control part of a brush holder. It is explanatory drawing which shows the modification of a brush holder.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of a starter motor 1 (hereinafter abbreviated as “motor 1”) according to an embodiment of the present invention. The motor 1 is used as an engine starter for motorcycles, particularly for motorcycles with a displacement of 200 cc or less. The motor 1 includes a stator 3 having a bottomed cylindrical yoke 2 and a rotor 5 having an armature 4 rotatably mounted in the stator 3. A bracket 6 made of aluminum die casting is attached to the opening end (left end portion in the figure) of the yoke 2. Two to four magnets (field permanent magnetic poles) 7 are fixed on the inner peripheral surface of the yoke 2 along the circumferential direction. Due to the magnet 7, the motor 1 has a four-pole configuration.

  The armature 4 has an armature core 11 and an armature coil 12 wound around the armature core 11. The armature core 11 is formed by laminating a plurality of metal core plates 13. The core plate 13 is fixed to the armature shaft 14. The right end of the armature shaft 14 in the drawing is rotatably supported by a bearing 15 attached to the yoke 2. A right end portion of the armature shaft 14 in the figure is rotatably supported by a bearing 16 attached to the bracket 6. In the motor 1, a sintered bearing is used for the bearing 15 and a ball bearing is used for the bearing 16.

  FIG. 2 is a side view of the armature core 11 viewed from the axial direction. As shown in FIG. 2, teeth 17 protrude from the outer periphery of the armature core 11. A slot 18 is formed between adjacent teeth 17. In the motor 1, 13 teeth 17 and 13 slots 18 are provided. An armature coil 12 is wound around the teeth 17 by wave winding, and the armature coil 12 is accommodated in each slot 18. That is, the motor 1 has a 4-pole 13-slot (4P13S) wave winding specification.

  A commutator 19 is disposed adjacent to one end side of the armature core 11. The commutator 19 is externally fixed to the armature shaft 14. The commutator 19 includes a body portion 21 made of a synthetic resin and a plurality of metal segments 22. The segment 22 is fixed to the outer peripheral surface of the body portion 21. The segments 22 are formed of a conductive material such as a copper plate and are electrically insulated from each other. A riser 23 is formed at the end of each segment 22 on the armature core 11 side. An armature coil 12 is wound around the riser 23 and fixed by fusing.

  FIG. 3 is an explanatory diagram showing the winding specifications of the armature coil 12. As shown in FIG. 3, in the armature coil 12, for example, the winding W is connected to the slot 18a between the 5th tooth 17a and the 6th tooth 17b, the 2nd tooth 17c and the 3rd tooth from the 7th segment 22a. It is wound between the slots 18b between 17d and connected to the first segment 22b. Next, from No. 1 segment 22b, it is wound between slot 18c between No. 12 teeth 17e and No. 13 teeth 17f and slot 18d between No. 9 teeth 17g and No. 10 teeth 17h, and No. 8 segment. 22c is connected. In other words, the winding order of each armature coil 12 to each slot 18 is not adjacent slots, and the slot 18a is followed by a slot 18c at a position facing about 180 °.

  The commutator 19 is in sliding contact with a brush 24 (−side 24a: first brush; + side 24b: second brush). FIG. 4 is an explanatory diagram showing the arrangement state of the brush 24. In the motor 1, as shown in FIG. 4, two brushes 24 are provided, and the two brushes 24 a and 24 b are arranged 90 ° apart in the circumferential direction. The brush 24 is accommodated in a brush holder 25 provided on the bracket 6. Each brush 24 is attached to the brush holder 25 so as to freely appear and disappear. The brush 24 is pressed against the commutator 19 by a brush spring 26.

  One end of a pigtail 31 (31a, 31b) is attached to each brush 24. A terminal 32 (32a: first terminal; 32b: second terminal) is attached to the other end of the pigtail 31. In the motor 1, the same brush unit (brush 24, pigtail 31, terminal 32) is used on the + side and the − side. The terminal 32a on the brush 24a side is fixed to the bracket 6 together with the brush holder 25 by one screw 33a. The terminal 32b on the brush 24b side is fixed to the power feeding terminal 27 by a screw 33b. The power supply terminal 27 is electrically connected to a power source (not shown), and power is supplied to the commutator 19 from an external power source via the brush 24.

  In addition, the four poles of the magnetic field enable the motor 1 to arrange the brushes 24 (− side 24a; + side 24b) at 90 ° intervals as shown in FIG. FIG. 4 is an explanatory diagram showing the arrangement state of the brush 24. As shown in FIG. 4, since the brush holder 25 of the motor 1 is sufficient if the two brushes 24 can be arranged at intervals of 90 °, the brush holder 25 is arranged in the circumferential direction as shown in FIG. The fan has a width θw (center angle) of less than 180 ° (here, about 120 °). FIG. 6 is an explanatory view showing the configuration of the conventional brush holder 101. As can be seen from FIG. 6, the brush holder 25 is significantly smaller than the conventional ring-shaped (360 °) brush holder 101. FIG. Is planned. Further, since the distance between the + side brush 24a and the power supply terminal 27 and the distance between the − side brush 24b and the fixing screw 33b (grounding portion) can be set substantially the same, the + side and the − side The same brush unit can be used, so that parts can be shared and the types of parts can be reduced.

  On the other hand, when the brush holder 25 is downsized and the structure in which the brush holder 25 is fixed to the bracket 6 with a single screw 33a is adopted, as described above, the brush holder 25 rotates with the screw 33a as the screw is tightened. The brush holder 25 cannot be positioned. Therefore, in the motor 1, the rotation restricting portion 34 is provided between the brush holder 25 and the bracket 6, and the movement of the brush holder 25 in the rotating direction is restricted and positioned.

  FIG. 7 is an explanatory view showing the structure of the bracket 6. As shown in FIG. 7, a holder mounting boss 36 projects from the bottom surface portion 35 of the bracket 6 at a portion where the brush holder 25 is mounted. The holder mounting boss 36 is formed with a screw mounting hole 37 into which the screw 33a is screwed. On the other hand, a boss fitting hole 38 into which the brush holder 25 can be inserted and fitted is formed corresponding to the holder mounting boss 36. The brush holder 25 is attached to the bottom surface portion 35 of the bracket 6 in such a manner that the boss fitting hole 38 is inserted and fitted into the holder mounting boss 36.

  The cylindrical inner peripheral wall 39 of the bracket 6 has a projecting portion 41 projecting in the radial direction (center direction). On the other hand, when the boss fitting hole 38 of the brush holder 25 is inserted and fitted into the holder mounting boss 36 on one end side of the brush holder 25, the protrusion facing the abutting portion 41 in the circumferential direction. For the time being, 42 is provided. The rotation restricting portion 34 includes the abutting portion 41 and the abutting surface 42.

  When the brush holder 25 is fixed to the bracket 6, if the screw 33 a is attached together with the terminal 32 a and tightened in the screw mounting hole 37, the brush holder 25 may be rotated clockwise by the tightening torque. At this time, if there is no means for restricting the rotation of the brush holder 25, as described above, the brush holder 25 rotates and its position cannot be determined. On the other hand, in the motor 1, when the boss fitting hole 38 is inserted and fitted into the holder mounting boss 36 and the brush holder 25 is arranged at a predetermined position of the bracket 6, the abutting portion 41 and the abutting surface of the rotation restricting portion 34. 42 opposes each other. Then, when the brush holder 25 rotates to the right as the screw 33a is tightened, the abutting surface 42 comes into contact with the abutting portion 41, and the rotation of the brush holder 25 is restricted.

  When the abutting surface 42 abuts against the abutting portion 41 in this way, the brush holder 25 does not rotate any more even if the screw 33a is tightened. That is, the brush holder 25 is positioned at a predetermined position of the bracket 6 by the rotation restricting portion 34 in a predetermined state, and is fixed by the screw 33a. Therefore, the brush holder 25 can be positioned and fixed to the bracket 6 easily and securely without using a special jig or the like or adding another part, and the number of parts and the number of assembling steps can be reduced. It becomes possible.

  Further, as shown in FIG. 5, a terminal arrangement portion 43 surrounded by walls on three sides is formed at the end of the brush holder 25 on the brush 24b side. The terminal arrangement portion 43 is provided with a bottom wall portion 44 and a side wall portion (insulating wall) 45, and the terminal arrangement portion 43 is three-wayd by the bottom wall portion 44, the side wall portion 45, and the side wall 47 of the brush accommodating portion 46. Is surrounded. The side wall portion 45 is formed so as to protrude above the upper surface 48 of the brush accommodating portion 46. A notch 49 is provided at the circumferential end of the side wall 45, and the end surface of the notch 49 is the aforementioned abutting surface 42. In the terminal arrangement portion 43, the pigtail 31b and the wire connection portion 50 of the terminal 32b are arranged.

  As described above, the terminal 32b is fixed to the power feeding terminal 27 by the screw 33b. When the terminal 32b is fixed to the power supply terminal 27, if the screw 33b is tightened, the terminal 32b may be rotated clockwise by the tightening torque. At this time, if there is no means for restricting the rotation of the terminal 32b, the terminal 32b may come into contact with the inner peripheral wall 39 of the bracket 6. The bracket 6 is formed by aluminum die casting, and if the terminal 32b contacts the inner peripheral wall 39, the insulation of the electric system may be impaired.

  On the other hand, in the motor 1, the wire connection part 50 of the terminal 32b is accommodated in the terminal arrangement part 43, and even if the terminal 32b is rotated clockwise by screw tightening, the wire connection part 50 is a side wall part. 45 abuts. That is, even if the terminal 32 b rotates, the rotation is restricted by the side wall portion 45, and no contact with the inner peripheral wall 39 occurs. The side wall 45 is made of synthetic resin, and is interposed between the terminal 32 b and the bracket inner peripheral wall 39. For this reason, the insulation between the terminal 32b and the bracket 6 is also ensured. Furthermore, in the brush holder 25, since the side wall part 45 is provided so as to protrude upward from the brush accommodating part 46b (second brush accommodating part), insulation between the pigtail 31b and the bracket 6 is also ensured.

  Thus, in the motor 1, the side wall part 45 is provided in the edge part of the brush holder 25, and rotation of the terminal 32b is controlled by this side wall part 45. FIG. Since the side wall part 45 is formed of an insulator (synthetic resin), it functions as an insulating part between the terminal and the bracket as well as the rotation of the terminal 32b. Therefore, it is possible to easily and reliably stop and insulate the terminal 32b without adding another part, and it is possible to reduce the number of parts and the number of assembling steps. Further, the side wall portion 45 also restricts the terminal 32b itself from moving toward the inner peripheral wall 39 side. As a result, the power supply terminal 27 connected to the terminal 32b by the screw 33b is also restricted from moving in the longitudinal direction (inside and outside of the apparatus), and the power supply terminal 27 can be prevented from coming off.

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 the above-described embodiment, the configuration in which the abutting portion 41 and the abutting surface 42 are provided as the rotation restricting portion 34 is shown, but the means for restricting the rotation of the brush holder 25 is not limited to this, and FIG. You may employ | adopt the structure as a)-(c). FIG. 9A shows the reverse of the concavo-convex relationship with the motor 1 described above. A bump 51 is protruded from the brush holder 25 and is brought into contact with the abutment surface 52 on the bracket 6 side. Yes. In FIG. 9B, the abutting portion 53 is provided on the bottom portion of the brush holder 25, and this abuts against the abutting surface 55 of the concave portion 54 provided on the bottom surface portion 35 of the bracket 6. In the case of FIG. 9B as well, the concavo-convex relationship may be reversed, and a convex portion may be provided on the bottom surface portion 35 of the bracket 6, and this may be fitted into the concave portion provided on the bottom portion of the brush holder 25. Further, as shown in FIG. 9 (c), the abutting portion 56 projects from the bottom surface portion 35 of the bracket 6, but the recess is not formed in the brush holder 25, and the right end portion of the brush holder 25 is used as the abutting surface 57. good.

  Further, as shown in FIG. 10, a positioning portion 62 may be further provided at the end of the brush holder 25 on the brush 24 a side. In the brush holder 61 of FIG. 10, the positioning part 62 is protrudingly provided along the circumferential direction. The positioning part 62 extends in a fan shape from the lower part of the brush accommodating part 46a (first brush accommodating part) in a shape like the bottom wall part 44 of the terminal arrangement part 43 in the brush holder 25 described above. A contact portion 63 is provided on the bottom surface portion 35 of the bracket 6 corresponding to the positioning portion 62. When the brush holder 25 is disposed at a predetermined position of the bracket 6, the end portion of the positioning portion 62 faces the contact portion 63.

  Here, there is a slight gap between the outer peripheral portion of the brush holder 25 and the inner peripheral wall 39 of the bracket 6. For this reason, when attaching the brush holder 25 in the bracket 6, the attachment position of the brush holder 25 may shift | deviate to radial direction by the above-mentioned clearance gap. Therefore, in the brush holder 61 of FIG. 10, a positioning portion 62 that defines the mounting position of the brush holder 61 is provided on the left end side of the holder, and this is opposed to the contact portion 63 of the bracket 6. As a result, when the brush holder 61 is attached, the positioning portion 62 contacts the contact portion 63, the movement of the brush holder 61 in the radial direction is restricted, and the brush holder 61 is positioned at a predetermined position to prevent erroneous assembly. Is planned.

DESCRIPTION OF SYMBOLS 1 Starter motor 2 Yoke 3 Stator 4 Armature 5 Rotor 6 Bracket 7 Magnet 11 Armature core 12 Armature coil 13 Core plate 14 Armature shaft 15 Bearing 16 Bearing 17 Teeth 17a No. 5 teeth 17b No. 6 teeth 17c No. 2 teeth 17d No. 3 teeth 17e 12th Teeth 17f 13th Teeth 17g 9th Teeth 17h 10th Teeth 18 Slot 18a Slot 18b between 5th Teeth and 6th Teeth 18c Slot 18c between 2nd Teeth and 3rd Teeth 12th Teeth and 13th Teeth Slot 18d between Slots 19 between teeth 9 and 10 Commutator 21 Body 22 Segment 22a 7th segment 22b 1st segment 22c 8th segment DOO 23 riser 24 brush 24a - side brush (first brush)
24b + side brush (second brush)
25 Brush holder 26 Brush spring 27 Power supply terminal 31 Pigtail 31a Negative side pigtail 31b Positive side pigtail 32 Terminal 32a Negative side terminal (first terminal)
32b + side terminal (second terminal)
33a-side screw (first fastening member)
33b + side screw (second fastening member)
34 Rotation restriction part 35 Bottom face part 36 Holder attachment boss 37 Screw attachment hole 38 Boss fitting hole 39 Inner peripheral wall 41 Abutting part 42 Abutting surface 43 Terminal arrangement part 44 Bottom wall part 45 Side wall part (insulating wall, insulating part)
46 Brush housing portion 46a-side brush housing portion (first brush housing portion)
46b + side brush housing part (second brush housing part)
47 Side wall 48 Upper surface 49 Notch portion 50 Wire connection portion 51 Abutting portion 52 Abutting surface 53 Abutting portion 54 Recessed portion 55 Abutting surface 56 Abutting portion 57 Abutting surface 61 Brush holder 62 Positioning portion 63 Abutting portion 101 Brush holder W Winding

Claims (13)

A metal bracket,
A power supply terminal attached to the bracket;
A brush holder that is housed and fixed in the bracket and that houses a first brush electrically connected to the bracket and a second brush electrically connected to the power supply terminal;
A first terminal electrically connected to the first brush via a pigtail and electrically and mechanically connected to the brush holder;
A first fastening member for fastening the first terminal and the brush holder;
A second terminal electrically connected to the second brush via a pigtail and electrically and mechanically connected to the power feeding terminal;
A second fastening member for fastening the second terminal and the power feeding terminal;
A starter motor comprising:
The starter motor has a rotation restricting portion that restricts rotation of the brush holder. The starter motor according to claim 1,
The rotation restricting portion includes a contact portion formed on the inner periphery of the bracket, and a contact surface formed on the brush holder and facing the contact portion in the circumferential direction. motor. The starter motor according to claim 1,
The rotation restricting portion includes a contact portion formed on an outer periphery of the brush holder, and a contact surface formed on the bracket and facing the contact portion in the circumferential direction. . The starter motor according to claim 1,
The rotation restricting portion has a bumping portion formed at a bottom portion of the brush holder, and a bumping surface formed on the bracket and facing the bumping portion in the circumferential direction. . The starter motor according to claim 1,
The rotation restricting portion includes a contact portion formed on a bottom surface portion of the bracket and a contact surface formed on the brush holder and facing the contact portion in the circumferential direction. motor. The starter motor according to any one of claims 1 to 5,
The brush holder rotates about the first fastening member;
The starter motor, wherein the rotation restricting part restricts rotation of the brush holder in a fastening rotation direction of the first fastening member. The starter motor according to any one of claims 1 to 6,
A starter motor comprising an insulating portion between the second terminal and the inner peripheral wall of the bracket. The starter motor according to claim 7,
The starter motor, wherein the insulating portion is an insulating wall formed integrally with the brush holder and disposed between the second terminal and the inner peripheral wall of the bracket. The starter motor according to claim 8,
The insulating wall rotates the second fastening member in a fastening rotation direction, and contacts the second terminal when the second terminal rotates in the rotation direction together with the second fastening member. motor. The starter motor according to claim 8,
The starter motor, wherein the insulating wall is disposed between the pigtail connected to the second brush and an inner peripheral wall of the bracket. The starter motor according to any one of claims 1 to 10,
The starter motor, wherein the brush holder has a positioning portion that defines a mounting position of the brush holder with respect to the bracket. The starter motor according to any one of claims 1 to 11,
The brush holder is formed in a substantially fan shape with a central angle of less than 180 °, at which the first and second brushes can be arranged at substantially 90 ° intervals, and a first brush housing portion in which the first brush is housed, A second brush accommodating portion for accommodating the second brush,
The distance between the attachment position of the first fastening member and the first brush housing portion and the distance between the attachment position of the second fastening member and the second brush housing portion are substantially equal. Starter motor. The starter motor according to claim 12,
The second brush housing portion is disposed between the first fastening member and the second fastening member,
The starter motor is characterized in that the first terminal is disposed between the second brush housing portion and the first brush housing portion.

Images