Starter

Abstract

To provide a starter comprising a brush holding device which prevents a movement defect of a brush in a space part of a brush holder and prolongs a lifetime of the brush without increasing cost of manufacture.SOLUTION: A starter (20) starts an internal combustion engine with rotary torque generated in an armature (9). A brush holder (13p1, 13p2, 13n1, 13n2) holding a brush (10p1, 10p2, 10n1, 10n2) sliding on a slide surface of a rectifier (9) and rectifying an armature current includes a space part (136), in which the brush is held movably, and a spring strut (139) provided outside of the space part. The brush held in the space part of the brush holder is pressed to the slide surface of the rectifier (9) by a torsion coil spring (12p1, 12p2, 12n1, 12n2) which is supported on the spring strut rotatably.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present application relates to a starter. [Background technology]

[0002] In a brush holding device for a rotating electric machine, a technology for making a brush holder that slidably holds a brush out of metal is well known. For example, a conventional brush device for a rotating electric machine disclosed in Patent Document 1 includes a metal brush holder, which movably holds a brush, and is configured to press the brush against the surface of a commutator by a spring held outside the brush holder. In the conventional brush holding device for a rotating electric machine disclosed in Patent Document 1, a metal base that fixes the brush holder and the negative brush holder are held at a negative potential, and the positive brush holder that is held at a positive potential is fixed to the base via an insulating member.

[0003] On the other hand, brush holding devices in which the brush holder is made of resin are also known. For example, a conventional brush holding device for a rotating electric machine disclosed in Patent Document 2 is configured such that a brush holding frame serving as a brush holder is made of resin, the brush holding frame contains brushes and coil springs, and the brushes are pressed against the surface of a commutator by the coil springs. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 4-79750 [Patent Document 2] Patent No. 3486094 Summary of the Invention [Problem to be solved by the invention]

[0005] The conventional brush holding device disclosed in Patent Document 1 has a spring that presses the brush on the outside of the brush holder, so the brush can be set to a large wear allowance, but an insulating member must be interposed between the base, which is held at a negative potential, and the positive-side brush holder, which is held at a positive potential, increasing the number of parts. Also, to prevent the brush from moving poorly inside the brush holder due to rusting of the metal brush holder, the metal brush holder may be plated with anti-rust plating, but this increases manufacturing costs, and depending on the usage conditions, plating the brush holder may not necessarily solve the problem of the brush moving poorly.

[0006] On the other hand, in the conventional brush holding device disclosed in Patent Document 2, the brush holding frame serving as the brush holder is made of resin, and therefore even if the base to which the brush holding frame is fixed is made of metal, there is no need to interpose an insulating member between them, but since the brush and the spring member pressing the brush are contained within the space in the brush holding frame, the wear allowance of the brush cannot be increased, and the life of the brush is shortened. Also, if a brush with a large wear allowance is used, the space in the brush holding frame must be made larger, which results in an increase in the size of the brush holding device.

[0007] The present application discloses technology for solving the above-mentioned problems, and aims to provide a starter equipped with a brush holding device that prevents poor brush movement within the space of the brush holder and extends the life of the brush without increasing manufacturing costs. [Means for solving the problem]

[0008] The starter disclosed in the present application is a yoke that forms a magnetic circuit for the magnetic flux generated by the field poles; an armature having an armature coil, the armature current flowing through the armature coil interlinking with the magnetic flux from the yoke to generate a rotational torque; a commutator connected to the armature coil and having a sliding surface on an outer periphery; a rotor shaft to which the armature and the commutator are coaxially fixed; a brush that slides on the sliding surface of the commutator and commutates the armature current; a brush holder made of an insulating material and configured to hold the brush so as to be movable in a direction perpendicular to an axis of the rotor shaft; A metal base for holding the brush holder; Equipped with A starter configured to start an internal combustion engine by the rotational torque generated in the armature, The brush holder includes: a spring support provided outside the space portion that movably holds the brush, a torsion coil spring rotatably supported on the spring support is configured to press the brush held in the space of the brush holder against the sliding surface of the commutator. It is characterized by: Effect of the Invention

[0009] According to the starter disclosed in the present application, a starter can be obtained that is equipped with a brush holding device that prevents poor movement of the brush within the space of the brush holder and extends the life of the brush, without increasing manufacturing costs.

[0010] Furthermore, according to the starter disclosed in the present application, it is possible to obtain a starter equipped with a brush holding device that prevents malfunction of the brush, extends the life of the brush, and reduces manufacturing costs. [Brief description of the drawings]

[0011] [Figure 1] 1 is a partial cross-sectional front view of a starter according to a first embodiment. [Diagram 2] 2 is a perspective view of a brush holding device in the starter according to the first embodiment. FIG. [Figure 3A] 2 is a perspective view showing an assembled state of a brush holder in the starter according to the first embodiment; FIG. [Figure 3B]2 is a perspective view showing a brush holder in the starter according to the first embodiment. FIG. [Figure 4] 2 is a perspective view showing a torsion coil spring in the starter according to the first embodiment. FIG. [Figure 5A] 11 is a plan view of a brush holder in a starter according to a second embodiment. FIG. [Figure 5B] 5B is a cross-sectional view taken along line BB of FIG. 5A, seen from the direction of arrow A. [Figure 6A] 11 is a plan view of a brush holder in a starter according to a third embodiment. FIG. [Figure 6B] 6B is a cross-sectional view taken along line BB of FIG. 6A, seen from the direction of arrow A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, starters according to first to third embodiments of the present invention will be described with reference to the drawings. In each drawing, the same reference numerals indicate the same or corresponding parts. Embodiment 1 1 is a partial cross-sectional front view of a starter according to embodiment 1. In FIG. 1, a starter 20 includes a solenoid switch 1, a motor unit 2, a front bracket 17, and a rear bracket 6.

[0013] The motor section 2, which is a permanent magnet field type DC motor, includes a cylindrical yoke 4 forming a magnetic circuit, a plurality of permanent magnets 5 as field poles fixed to the inner peripheral surface of the yoke 4, an armature 7 whose outer peripheral surface faces the inner peripheral surfaces of these permanent magnets 5 via a gap of a predetermined dimension, a commutator 9, a rotor shaft 8, two positive pole side brushes (not shown), two negative pole side brushes (only one negative pole side brush 10n1 is shown in FIG. 1), and a brush holding device 100 that holds these brushes. Details of the brush holding device 100 will be described later.

[0014] The armature 7 includes an armature core and an armature coil 3 attached to the armature core. The yoke 4 and the permanent magnets 5 form a stator of the motor section 2, and the armature 7 and the commutator 9 form a rotor of the motor section 2.

[0015] The rotor shaft 8 passes through the armature 7 and the commutator 9 in the axial direction, and fixes them in a coaxial arrangement. The rotor shaft 8 is rotatably supported by a bearing 15 provided on the inner wall of the rear bracket 6 and a bearing (not shown) provided inside the front bracket 17.

[0016] One open axial end of the front bracket 17 is fitted into one open axial end of the yoke 4 of the motor section 2, and one open axial end of the rear bracket 6 is fitted into the other open axial end of the yoke 4 of the motor section 2. The front bracket 17 and the rear bracket 6 are fastened by a plurality of through bolts 16 via the yoke 4 in directions approaching each other, and are fixed integrally with the yoke 4.

[0017] The rear bracket 6 accommodates therein a commutator 9, a brush holding device 100, four brushes including the negative electrode brush 10n1, and a portion of the rotor shaft 8.

[0018] A transmission mechanism (not shown) that transmits the rotational torque generated in the armature 7 of the motor unit 2 to the internal combustion engine is assembled inside the front bracket 17. An opening 171 is formed at the other axial end of the front bracket 17, and a pinion gear 21 that constitutes part of the transmission mechanism described above is exposed from the opening 171. The pinion gear 21 moves axially to the right in Fig. 1 to mesh with a ring gear (not shown) of the internal combustion engine, starting the internal combustion engine.

[0019] A solenoid switch attachment portion 172 extending perpendicular to the axial direction is formed on the front bracket 17. The solenoid switch 1 is fixed to the solenoid switch attachment portion 172 by a bolt 173.

[0020] The solenoid switch 1 is equipped with terminal bolts 111 and 112. A lead wire 18 connected to the terminal bolt 111 passes through an insulating grommet 19, is introduced into the rear bracket 6, and is connected to two positive electrode brushes 10p1 and 10p2 (see FIG. 2) as described later.

[0021] Here, the operation of the starter 20 according to the embodiment 1 will be described. When an ignition switch (not shown) of the internal combustion engine is closed by the driver of the vehicle, the solenoid switch 1 is turned on, and an armature current is supplied to the armature coil 3 from an on-board battery (not shown) via each brush and the commutator 9. The armature current flowing through the armature coil 3 interlinks with the magnetic flux from the yoke 4, generating a rotational torque in the armature 7, causing the armature 7 to rotate.

[0022] When the armature 7 rotates, the commutator 9 and the brushes sliding on the sliding surface of the commutator 9 commutate the armature current, and the armature 7 continues to rotate. At the same time, a transmission mechanism built into the starter 20 causes the pinion gear 21 to slide in the axial direction and mesh with the ring gear of the internal combustion engine, rotating it and starting the internal combustion engine. After the internal combustion engine starts, the pinion gear 21 returns to its original position, the solenoid switch 1 turns off, and the operation of the starter 20 stops.

[0023] Next, a brush holding device of a starter according to the first embodiment will be described. Fig. 2 is a perspective view of the brush holding device in the starter according to the first embodiment. In Fig. 2, the brush holding device 100 includes a metal disk-shaped base 14 having an opening 141 in the center, four resin brush holders 13p1, 13p2, 13n1, 13n2, and torsion coil springs 12p1, 12p2, 12n1, 12n2 attached to the brush holders 13p1, 13p2, 13n1, 13n2, respectively. The base 14 is fixed to the inner wall surface of the rear bracket 6.

[0024] 2, the brush holders 13p1 and 13p2 are configured to be symmetrical with respect to each other, and the brush holders 13n1 and 13n2 are configured to be symmetrical with respect to each other. The brush holders 13p1 and 13n1 have the same configuration, and the brush holders 13p2 and 13n2 have the same configuration.

[0025] Here, the configuration of brush holder 13p2 will be described as an example. Fig. 3B is a perspective view showing the brush holder in the starter according to embodiment 1, illustrating brush holder 13p2. In Fig. 3B, brush holder 13p2 has a rectangular top wall portion 131 extending parallel to the surface portion of base 14, and an outer surface portion 132 extending perpendicularly from a side edge 131a of top wall portion 131 toward the side opposite to the top wall portion.

[0026] In addition, brush holder 13p2 includes an outer surface portion 133 extending vertically toward the anti-top wall side from side edge 131b opposite side edge 131a of top wall portion 131, an outer end surface portion 134 extending vertically toward the anti-top wall side from side edge 131c perpendicular to side edge 131a of top wall portion 131, and an outer end surface portion 135 extending vertically toward the anti-top wall side from side edge 131d opposite side edge 131c of top wall portion 131.

[0027] Further, the brush holder 13p2 includes a bottom wall portion 137 extending parallel to the top wall portion 131. A back surface portion 1371 of the bottom wall portion 137 has a rectangular shape similar to that of the front surface portion 1311 of the top wall portion 131.

[0028] The brush holder 13p2 has a space 136. As shown in FIG. 2, the positive brush 10p2 is accommodated in the space 136 so as to be movable in a direction perpendicular to the axis X of the rotor shaft 8. The outer surface portions 132, 133 extend to face the space 136.

[0029] The outer side surface portion 132 has a notch portion 1321 that is cut from the outer end surface portion 135 and connects to the space portion 136. The outer side surface portion 133 has a notch portion 1331 that is cut from the outer end surface portion 134 and connects to the space portion 136.

[0030] A groove 1322 extending parallel to a back surface 1371 of the bottom wall 137 is formed in the outer surface 132. An outer surface 1322a on the back surface 1371 side adjacent to the groove 1322 is configured to be closer to the space 136 side than the outer surface 132 by a predetermined dimension.

[0031] A groove portion 1332 extending parallel to a back surface portion 1371 of the bottom wall portion 137 is formed in the outer side surface portion 133. An outer side surface portion 1332a adjacent to the back surface portion 1371 adjacent to the groove portion 1332 is configured to be closer to the space portion 136 side by a predetermined dimension than the outer side surface portion 133.

[0032] Further, a spring support 138 is provided on the outer side surface portion 132 between the notch portion 1321 and the recessed groove portion 1322, and extends perpendicular to the outer side surface portion 132. A spring support 139 is provided on a surface portion 138a of the spring support 138, and extends perpendicular to the surface portion 138a of the spring support 138 and parallel to the outer side surface portion 132. The spring support 139 is formed integrally with the brush holder 13p2 and the spring support 138 using the same resin material as the brush holder 13p2 and the spring support 138. The spring support 139 may be solid or hollow.

[0033] Further, a recess 140 having a semicircular cross section that is connected to a surface portion 138a of the spring support 138 is formed in the outer side surface portion 132. One end of the torsion coil spring 12p2 abuts against the recess 140, as described later.

[0034] 3A is a perspective view showing the assembled state of the brush holder in the starter according to the embodiment 1, showing the state in which the positive brush 10p2 and the torsion coil spring 12p2 are attached to the brush holder 13p2 configured as described above. As shown in FIG. 3A, the positive brush 10p2 is inserted into the space 136 of the brush holder 13p2 so as to be movable parallel to the outer side surfaces 132, 133.

[0035] The torsion coil spring 12p2 has its inner space rotatably inserted into a spring support 139 and is supported by a spring support 138. One end 12p21 of the torsion coil spring 12p2 abuts against a recess 140 provided in the outer surface portion 132 of the brush holder 13p2, and the other end 12p22 of the torsion coil spring 12p2 is inserted into the space 136 of the brush holder 13p2 via a notch 1321 of the brush holder 13p2 and abuts against one end of the positive brush 10p2 to press the positive brush 10p2 in the direction of the commutator 9 (see FIG. 1).

[0036] The other end of the positive brush 10p2 protrudes from the outer end surface 134 of the brush holder 13p2 due to the elastic force of the torsion coil spring 12p2 and comes into contact with the sliding surface of the commutator 9.

[0037] The above describes the configuration of the brush holder 13p2 and the case where the positive electrode brush 10p2 and the torsion coil spring 12p2 are attached to the brush holder 13p2, but the brush holder 13n2 has the same configuration as the brush holder 13p2. Also, the configurations of the brush holders 13p1 and 13n1 and the arrangement of the brushes and torsion coil springs relative to them are plane symmetrical to the above-mentioned brush holders 13p2 and 13n2.

[0038] As shown in FIG. 2, a positive electrode side brush 10p1 and a torsion coil spring 12p1 are attached to the brush holder 13p1, a positive electrode side brush 10p2 and a torsion coil spring 12p2 are attached to the brush holder 13p2, a negative electrode side brush 10n1 and a torsion coil spring 12n1 are attached to the brush holder 13n1, and a negative electrode side brush 10n2 and a torsion coil spring 12n2 are attached to the brush holder 13n2.

[0039] The brush holders 13p1 and 13n2 are disposed to face each other across the axis X, and the brush holders 13p2 and 13n1 are disposed to face each other across the axis X.

[0040] The lead wire 18 introduced into the rear bracket 6 via the grommet 19 is branched into two lead wires 181 and 182. One of the branched lead wires 181 passes through a notch 1331 in the brush holder 13p1 and is connected to one of the positive brushes 10p1, and the other branched lead wire 182 passes through a notch 1331 in the brush holder 13p2 and is connected to the other positive brush 10p2.

[0041] The negative brush 10n2 is connected by a lead wire 10w to a metal base 14. Similarly, the negative brush 10n1 is connected to the metal base 14 by a lead wire (not shown).

[0042] Brush holders 13p1, 13p2, 13n1, 13n2 are held on base 14 by inserting brush holder retainer 142 provided on base 14 into grooves 1322, 1332 (see Figures 3A and 3B) provided on outer surface portions 132, 133 near bottom wall portion 137.

[0043] Brush holder holding body 142 is formed by cutting and raising base 14, and is formed so as to extend in the direction of axis X from the outer circumferential edge of base 14. As shown in Fig. 5B of embodiment 2 described later, brush holder holding body 142 is formed by cutting and raising a portion of base 14 in the direction of axis X to a predetermined length, and the tips of the cut-and-raised pieces 1421, 1422 are bent so as to be engageable with recessed grooves 1322, 1331 of the brush holder.

[0044] Brush holder holding body 142 is configured with a pair of cut-and-raised pieces 1421, 1422 that face each other with a gap therebetween for one brush holder. Brush holder holding body 142 has the same configuration in embodiment 1, embodiment 2, and embodiment 3.

[0045] It should be noted that brush holder retaining body 142 is not limited to the above configuration, and may have a configuration different from that described above, for example, configured from a member separate from base 14 and fixed to base 14.

[0046] In the starter according to embodiment 1 equipped with the brush holding device 100 configured as described above, the lead wire 18 connected to the terminal bolt 111 of the solenoid switch 1 passes through a non-conductive grommet 19 and is connected to the positive electrode side brushes 10p1, 10p2 inside the starter 20.

[0047] The positive brushes 10p1, 10p2 are held by brush holders 13p1, 13p2 together with the torsion coil springs 12p1, 12p2 so as to be movable in the direction of the axis X, and the armature current that flows from the positive brushes 10p1, 10p2 through the commutator 9 to the armature coil 3 is transmitted to the negative brushes 10n1, 10n2 again through the commutator 9. The armature current flows from the negative brushes 10n1, 10n2 through the lead wires 10w to the base 14 and is grounded via the yoke 4 and the front bracket 17.

[0048] Brush holders 13p1, 13p2, 13n1, 13n2 formed from a resin, such as phenolic resin, include spring supports 139 for inserting torsion coil springs 12p1, 12p2, 12n1, 12n2 made of a metal, such as SUS (Stainless Used Steel), and recesses 140 for holding one ends (12p21 shown in FIG. 3A) of torsion coil springs 12p1, 12p2, 12n1, 12n2.

[0049] One end 12p21 of the torsion coil spring is held in a recess 140 of the brush holder, thereby preventing the torsion coil spring from rotating around the spring support 139 and from moving in the axial direction of the spring support 139.

[0050] The recess 140 of each brush holder is provided on the outer surface portion 132 facing the brush inserted in the space 136 of the brush holder, and extends parallel to the moving direction of the brush. The curvature of the recess 140 of each brush holder is set to be smaller than the curvature of the wire diameter of one end 12p21 of the torsion coil spring.

[0051] The other end 12p22 of the torsion coil spring urges the positive electrode brushes 10p1, 10p2 and the negative electrode brushes 10n1, 10n2 in the direction of the commutator 9, and the reaction force is transmitted to one end 12p21 of the torsion coil spring via the spring support 139. However, since one end 12p21 of the torsion coil spring is held in a recess 140 of the brush holder, the above-mentioned reaction force is received by the outer surface portion 132 of the brush holder, thereby preventing rotation and axial movement of the torsion coil spring.

[0052] In addition, in embodiment 1, the cross section of recessed portion 140 of the brush holder is arc-shaped, but this is not limited to an arc shape and may be any other shape as long as it can hold one end 12p21 of the torsion coil spring.

[0053] In addition, in the first embodiment, the recess 140 of the brush holder is shaped to extend parallel to the moving direction of the brush in the brush holder, but it may extend parallel to the extending direction of one end 12p21 of the torsion coil spring. In this case, the contact area between one end 12p21 of the torsion coil spring and the recess 140 of the brush holder increases, so that the stress generated in the recess 140 of the brush holder by the pressing force of one end 12p21 of the torsion coil spring can be alleviated.

[0054] Since the recess 140 of the brush holder is provided in the outer surface portion 132 corresponding to the brush in the space portion 136 of the brush holder, when the brush holder is thermally deteriorated due to continuous current flow caused by abnormal input, etc., one end 12p21 of the torsion coil spring will apply strong pressure from the recess 140 to the outer surface portion 132 of the brush holder in the direction of the brush inserted in the space portion 136, damaging the brush holder, and one end 12p21 of the torsion coil spring will press against the outer surface portion of the brush inserted in the space portion 136, thereby suppressing movement of the brush.

[0055] As a result, the contact pressure between the brushes and the commutator 9 decreases, the contact resistance between the brushes and the commutator 9 increases, and the current flow decreases. This makes it possible to suppress a sudden increase in temperature of the motor unit 2, or to interrupt the contact between the brushes and the commutator 9 and open the electric circuit, thereby cutting off the current to the motor unit 2 and stopping the motor unit 2, thereby preventing a sudden heat generation in the motor unit 2.

[0056] Next, heat resistance measures for suppressing thermal deterioration of spring support 139 will be described. Fig. 4 is a perspective view showing a torsion coil spring in a starter according to embodiment 1. In Fig. 4, torsion coil spring 12p2 is composed of one end 12p21 abutting against recess 140 of the brush holder, helical portion 12c, the other end 12p22 abutting against the brush, and crossover portion 12d between helical portion 12c and the other end 12p22.

[0057] Here, heat generated by current passing through the brush is transferred to the crossover portion 12d, causing thermal deterioration of the resin spring support 139. In order to suppress thermal deterioration of this spring support 139, for example, the crossover portion 12d may be made zigzag-shaped to increase the heat transfer path, or the surface area of ​​the crossover portion 12d may be increased to increase heat dissipation, or a heat-resistant means using both of these may be provided.

[0058] Also, by using a metal material for the crossover portion 12d that is different from the metal material for the torsion coil spring 12p2, for example, it is possible to increase the heat capacity of the crossover portion 12d and suppress the heat transfer to the spring support 139. Furthermore, by attaching a heat sink to the crossover portion 12d made of a different metal, it is possible to increase the heat capacity of the crossover portion 12d and improve the heat dissipation efficiency. Also, in order to suppress the amount of heat transferred from the brush to the torsion coil spring, another member, for example, a material such as ceramic, may be sandwiched between the brush and the torsion coil spring.

[0059] Embodiment 2 Next, a brush holder of a starter according to embodiment 2 will be described. Fig. 5A is a plan view of the brush holder in the starter according to embodiment 2, and Fig. 5B is a cross-sectional view taken along line BB in Fig. 5A as viewed from the direction of arrow A. In Figs. 5A and 5B, the brush holder 13p2 accommodates the positive electrode brush 10p2 in a space portion 136 and holds it movably.

[0060] The spring support 139 provided on the spring support 138 is composed of a hollow cylinder 1391 formed integrally with the spring support 138, and a columnar support core 1392 inserted into the hollow portion of the cylinder 1391. The support core 1392 is made of a material having higher heat resistance than the cylinder 1391 made of resin, such as iron. Since the spring support 139 is thus configured, it is possible to suppress thermal deterioration of the spring support 139 caused by the amount of heat that reaches the spring support 139 via the torsion coil spring 12p2 due to heat generated by the energization of the brush.

[0061] The spring supports 139 in the other brush holders 13p1, 13n1, and 13n2 are configured similarly to the spring support 139 in the brush holder 13p2. Other configurations of the starter according to the second embodiment are similar to those of the starter according to the first embodiment.

[0062] According to the starter of the second embodiment, it is possible to suppress thermal deterioration of the spring support column caused by the amount of heat that is generated by energizing the brush and reaches the spring support column via the torsion coil spring.

[0063] Embodiment 3 Next, a brush holder of a starter according to embodiment 3 will be described. Fig. 6A is a plan view of the brush holder in the starter according to embodiment 3, and Fig. 6B is a cross-sectional view taken along line BB in Fig. 6A, as viewed from the direction of arrow A. In Figs. 6A and 6B, the brush holder 13p2 accommodates the positive brush 10p2 in a space portion 136 and holds it movably.

[0064] Spring support 139 provided on spring support 138 is composed of a hollow cylinder section 1391 formed integrally with spring support 138, and a columnar support core section 1392 inserted into the hollow section of cylinder section 1391. Support core section 1392 is made of a material having higher heat resistance than cylinder section 1391 made of resin, such as iron, and an end section of the support core section 1392 is fitted into through hole 143 provided in metal base 14.

[0065] Since the spring support 139 is configured as described above, the heat generated by energizing the brush reaches the spring support 139 via the torsion coil spring 12p2, and is further transmitted from the support core 1392 to the base 14. This makes it possible to suppress a temperature rise in the spring support 139, and further improves the heat resistance of the spring support 139.

[0066] The spring support 139 in the brush holders 13p1, 13n1, and 13n2 is configured similarly to the spring support 139 in the brush holder 13p2. The other configurations of the starter according to the third embodiment are similar to those of the starter according to the first embodiment.

[0067] It should be noted that support core portion 1392 only needs to be mechanically connected to base 14. For example, base 14 may be cut and raised by burring to be used as support core portion 1392.

[0068] According to the starter of the third embodiment, it is possible to suppress thermal deterioration of the spring support, which would otherwise occur due to the amount of heat generated by energizing the brush and reaching the spring support via the torsion coil spring.

[0069] Although exemplary embodiments are described in this application, various features, aspects, and functions described in one or more embodiments are not limited to application to a specific embodiment, but can be applied to the embodiments alone or in various combinations. Therefore, countless modifications not illustrated are expected within the scope of the technology disclosed in this application. For example, the following are included: modifying, adding, or omitting at least one component; and extracting at least one component and combining it with components of another embodiment.

[0070] Next, aspects of the starter disclosed in the present application will be described below as supplementary notes. (Appendix 1) a yoke that forms a magnetic circuit for the magnetic flux generated by the field poles; an armature having an armature coil, the armature current flowing through the armature coil interlinking with the magnetic flux from the yoke to generate a rotational torque; a commutator connected to the armature coil and having a sliding surface on an outer periphery; a rotor shaft to which the armature and the commutator are coaxially fixed; a brush that slides on the sliding surface of the commutator and commutates the armature current; a brush holder made of an insulating material and configured to hold the brush so as to be movable in a direction perpendicular to an axis of the rotor shaft; A metal base for holding the brush holder; Equipped with A starter configured to start an internal combustion engine by the rotational torque generated in the armature, The brush holder includes: a spring support provided outside the space portion that movably holds the brush, a torsion coil spring rotatably supported on the spring support is configured to press the brush held in the space of the brush holder against the sliding surface of the commutator. A starter characterized by: (Appendix 2) One end of the torsion coil spring abuts against an outer surface portion facing the space, The other end of the torsion coil spring abuts against the brush, a reaction force acting on the torsion coil spring when the other end of the torsion coil spring presses against the brush is received by the outer surface portion with which the one end of the torsion coil spring abuts; 2. A starter according to claim 1. (Appendix 3) The outer surface portion of the brush holder is provided with a recessed portion that engages with the one end portion of the torsion coil spring. 3. A starter according to claim 2. (Appendix 4) The torsion coil spring includes a helical portion, The spiral portion is connected to the other end portion via a crossover portion, The crossover portion is provided with a heat-resistant means. 4. A starter according to claim 3. (Appendix 5) The spring strut comprises: A cylindrical portion made of an insulating material and having a hollow portion; A support core portion is inserted into the hollow portion of the cylindrical portion and is made of a material having a higher heat resistance than the heat resistance of a material constituting the cylindrical portion; It is composed of 5. A starter according to any one of claims 1 to 4. (Appendix 6) The support core is connected to the base. 6. A starter according to claim 5. (Appendix 7) The brushes include two positive brushes and two negative brushes, the brush holders include two positive brush holders each holding one of the positive brushes, and two negative brush holders each holding one of the negative brushes, The two positive electrode side brush holders are configured to be plane symmetrical to each other, The two negative electrode brush holders are configured to be plane symmetrical to each other. 7. A starter according to any one of claims 1 to 6, [Explanation of symbols]

[0071] 1 solenoid switch, 2 motor section, 3 armature coil, 4 yoke, 6 rear bracket, 7 armature, 8 rotor shaft, 9 commutator, 10p1, 10p2 positive brush, 10n1, 10n2 negative brush, 12p1, 12p2, 12n1, 12n2 torsion coil spring, 12c helical part, 12d crossing section, 12p21 one end, 12p22 other end, 13p1, 13p2, 13n1, 13n2 brush holder, 131 Top wall, 1311 Surface, 131a, 131b, 131c, 131d side edges, 132, 133 outer surface section, 134, 135 outer end surface section, 136 Space, 1321, 1331 Notch, 1322, 1332 Groove, 137 bottom wall portion, 1371 back surface portion, 138 spring support, 138a surface portion, 139 spring support, 1391 tube portion, 1392 support core portion, 140 recess portion, 14 base, 141 opening, 142 brush holder retainer, 15 bearing, 16 through bolt, 17 front bracket, 18, 181, 182, 10w lead wire, 19 grommet, 20 starter, 100 brush holder, 111, 112 terminal bolt, 171 opening, 172 Solenoid switch mounting part, 173 Volts

Claims

1. a yoke that forms a magnetic circuit for the magnetic flux generated by the field poles; an armature having an armature coil, the armature current flowing through the armature coil interlinking with the magnetic flux from the yoke to generate a rotational torque; a commutator connected to the armature coil and having a sliding surface on an outer periphery; a rotor shaft to which the armature and the commutator are coaxially fixed; a brush that slides on the sliding surface of the commutator and commutates the armature current; a brush holder made of an insulating material and configured to hold the brush so as to be movable in a direction perpendicular to an axis of the rotor shaft; A metal base for holding the brush holder; Equipped with A starter configured to start an internal combustion engine by the rotational torque generated in the armature, The brush holder includes: a spring support provided outside the space portion that movably holds the brush, a torsion coil spring rotatably supported on the spring support column is configured to press the brush held in the space of the brush holder against the sliding surface of the commutator. A starter characterized by:

2. One end of the torsion coil spring abuts against an outer surface portion facing the space, The other end of the torsion coil spring abuts against the brush, a reaction force acting on the torsion coil spring when the other end of the torsion coil spring presses against the brush is received by the outer surface portion with which the one end of the torsion coil spring abuts.

2. The starter according to claim 1 .

3. The outer surface portion of the brush holder is provided with a recessed portion that engages with the one end portion of the torsion coil spring.

3. A starter according to claim 2.

4. The torsion coil spring includes a helical portion, The spiral portion is connected to the other end portion via a crossover portion, The crossover portion is provided with a heat-resistant means.

4. A starter according to claim 3.

5. The spring strut comprises: A cylindrical portion made of an insulating material and having a hollow portion; A support core portion is inserted into the hollow portion of the cylindrical portion and is made of a material having a higher heat resistance than the heat resistance of a material constituting the cylindrical portion; It is composed of 5. A starter according to claim 1, wherein the starter is a rotor.

6. The support core is connected to the base.

6. A starter according to claim 5.

7. The brushes include two positive brushes and two negative brushes, the brush holders include two positive brush holders each holding one of the positive brushes, and two negative brush holders each holding one of the negative brushes, The two positive electrode side brush holders are configured to be plane symmetrical to each other, The two negative electrode brush holders are configured to be plane symmetrical to each other.

5. A starter according to claim 1, wherein the starter is a rotor.

8. The brushes include two positive brushes and two negative brushes, the brush holders include two positive brush holders each holding one of the positive brushes, and two negative brush holders each holding one of the negative brushes, The two positive electrode side brush holders are configured to be plane symmetrical to each other, The two negative electrode brush holders are configured to be plane symmetrical to each other.

6. A starter according to claim 5.

9. The brushes include two positive brushes and two negative brushes, The brush holder. The positive electrode brush holders each hold one of the positive electrode brushes, and the negative electrode brush holders each hold one of the negative electrode brushes, The two positive electrode side brush holders are configured to be plane symmetrical to each other, The two negative electrode brush holders are configured to be plane symmetrical to each other.

7. A starter according to claim 6.

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