JP2015213417A - Brush device and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress generation of noise and abnormal sound at the time of a motor starting.SOLUTION: A brush device 40 comprises a holding wall 56 that is formed on a base plate 42 and is disposed on the outside of a coil part 82 in the direction of the width of a brush 70. The diameter dimension D of the coil part 82 is set to be larger than a distance L between a side face 70A of the brush 70 and an opposite wall 56A of the holding wall 56. For this reason, in a state in which the coil part 82 is mounted on a pedestal part 52, the coil part 82 is held by the side face 70A of the brush 70 and the opposite wall 56A of the holding wall 56 and is bent and deformed in the radial direction toward the inside of the coil part 82. For this reason, reactive force acts from the opposite wall 56A to the coil part 82; the reactive force makes the coil part 82 energize the brush 70 in the direction of the width of the brush 70 toward the inside of the brush 70. Thereby, vibration of the brush 70 in the circumferential direction of a commutator 32 is suppressed; generation of noise and abnormal sound at the time of a motor 10 starting can be suppressed.

Description

  The present invention relates to a brush device and a motor.

  In the brush holding structure described in the following Patent Document 1, a brush is slidably accommodated in a brush holder, and the brush is pressed toward the commutator by a leaf spring. Specifically, the leaf spring includes a coil portion that constitutes both ends in the longitudinal direction and a pressing portion that constitutes a middle portion in the longitudinal direction. And a leaf | plate spring is pulled out from a coil part, a press part is contact | abutted on the back surface of a brush, and a brush is pressed to the commutator side by a press part.

  The insulator plate (base plate) has a spring receiving wall, and the brush holder has cut and raised pieces. And the circumference | surroundings of a coil part are supported by the spring receiving wall and the cut-and-raised piece.

JP-A-2-303346

  However, in the brush holding structure, although the periphery of the coil portion is supported by the spring receiving wall and the cut-and-raised piece, the coil portion is disposed away from the brush as shown in FIG. Has been. That is, the coil part may move in the circumferential direction of the commutator (brush width direction) when the motor is operated. In this case, the leaf spring drawn out from the coil portion is cut and raised and hits the root of the piece, and noise and abnormal noise may occur between the leaf spring and the brush holder. Moreover, there is a possibility that noise and abnormal noise are generated when the brush vibrates in the circumferential direction of the commutator.

  In view of the above fact, an object of the present invention is to provide a brush device that can suppress the generation of noise and abnormal noise during motor operation.

  The brush device according to claim 1 is a brush formed in a prism shape, a base plate formed in an annular shape and disposed radially outside a commutator, and provided on the base plate, and the brush is disposed on the commutator. A brush holder that is slidably accommodated in a radial direction of the brush, a pressing portion that presses at least a central portion of the end surface of the brush opposite to the commutator toward the commutator, and one circumferential side of the commutator in the pressing portion And extending from at least one of the other sides and wound in a cylindrical shape with the thickness direction of the base plate as an axial direction on the outer side in the width direction of the brush, and the brush is attached to the inner side in the width direction of the brush. And a spring configured to include a biasing coil portion.

  According to the brush device having the above configuration, the annular base plate is disposed on the radially outer side of the commutator. The base plate is provided with a brush holder, and the brush is accommodated in the brush holder so as to be slidable in the radial direction of the commutator.

  Moreover, the brush apparatus is comprised including the spring formed in the elongate shape. The spring includes a pressing portion and a coil portion, and the coil portion extends from the pressing portion. Furthermore, the coil portion is wound in a cylindrical shape with the plate thickness direction of the base plate being the axial direction on the outer side in the width direction of the brush, and the end surface on the opposite side of the brush commutator is pressed toward the commutator by the spring pressing portion. Has been. In other words, a part of the part that forms the coil part is drawn out, and the drawn part acts on the coil part so that the end face on the side opposite to the commutator of the brush is pressed against the commutator side. Is pressed.

  Here, the coil portion urges the brush inward in the width direction of the brush. For this reason, it is suppressed that a brush vibrates in the circumferential direction of a commutator. Therefore, the generation of noise and abnormal noise during motor operation can be suppressed.

  The brush device according to claim 2 is the brush device according to claim 1, wherein the brush holder or the base plate has a nipping wall formed on the outer side in the width direction of the brush, The coil portion is held between the brushes.

  According to the brush device having the above configuration, the holding wall is formed on the brush holder or the base plate. The sandwiching wall is disposed outside the brush in the width direction, and the coil portion is sandwiched between the sandwiching wall and the brush. For this reason, the coil part is bent and deformed inward in the radial direction to urge the brush, and the movement of the coil part in the circumferential direction of the commutator (the width direction of the brush) is suppressed. Thereby, for example, the occurrence of noise and abnormal noise between the portion pulled out from the coil portion and the brush holder is suppressed. Therefore, it is possible to further suppress the generation of noise and abnormal noise during motor operation.

  The brush device according to claim 3 is the brush device according to claim 2, wherein the holding wall includes an inclined wall, and when viewed from the thickness direction of the base plate, the inclined wall is It arrange | positions in the radial direction outer side of the said commutator with respect to a coil part, and is inclined so that it may go to the width direction inner side of the said brush as it goes to the radial direction outer side of the said commutator.

  According to the brush device having the above configuration, the holding wall includes the inclined wall. The inclined wall is inclined so as to go inward in the width direction of the brush as it goes outward in the radial direction of the commutator when viewed from the thickness direction of the base plate. That is, as viewed from the thickness direction of the base plate, the inclined wall is inclined in a direction away from the coil portion as it goes inward in the width direction of the brush. For this reason, compared with the case where the inclined wall is extended along the width direction of a brush, the edge part by the side of the brush of an inclined wall can be spaced apart and arrange | positioned from a coil part. Thereby, it can suppress that the part pulled out from the coil part hits the edge part by the side of the brush of an inclination wall. Thereby, it can suppress that noise and noise generate | occur | produce between a spring and a holding wall (inclined wall).

  The brush device according to claim 4 is the brush device according to claim 3, wherein the clamping wall includes an opposing wall, and the opposing wall is the brush when viewed from the thickness direction of the base plate. Is arranged outside the commutator in the radial direction and is formed in parallel with the radial direction of the commutator.

  According to the brush apparatus of the said structure, the reaction force of the force which a coil part tries to open to the width direction outer side of a brush can be provided to a brush. That is, a coil part presses a brush toward the width direction inner side of the said brush. Thereby, the vibration of the brush can be suppressed.

  The brush device according to claim 5 is the brush device according to claim 2, wherein an auxiliary wall is provided at an end of the clamping wall on the commutator side, and the coil portion abuts on the auxiliary wall. As a result, the movement of the coil portion toward the commutator is restricted.

  According to the brush apparatus of the said structure, it can suppress that a spring pulls out from a brush holder by providing the auxiliary wall which controls the movement to the commutator side of a coil part. In particular, the spring can be prevented from coming out of the brush holder when the brush is worn and the size of the brush is shortened.

  The brush device according to claim 6 is the brush device according to any one of claims 1 to 5, wherein a central portion in a circumferential direction of the commutator in the pressing portion is convex toward the commutator side. Is formed.

  According to the brush apparatus of the said structure, the center part of the width direction of a brush can be pressed because the press part of a spring is formed as mentioned above. Thereby, the brush can be urged toward the commutator in a stable state.

  The brush device according to claim 7 is the brush device according to any one of claims 1 to 6, wherein the coil portion is provided on one side and the other side in the circumferential direction of the commutator in the pressing portion, respectively. It has been.

  According to the brush apparatus of the said structure, a brush can be urged | biased from the width direction both sides of a brush with a coil part.

  The brush device according to an eighth aspect is the brush device according to the seventh aspect, wherein the pair of coil portions are in contact with both end faces in the width direction of the brush.

  According to the brush device having the above-described configuration, the urging force in the width direction of the brush can be input from the coil portion to the brush by bringing the pair of coil portions into contact with both end faces in the width direction of the brush.

  A brush device according to a ninth aspect is the brush device according to the seventh or eighth aspect, wherein the urging force applied to the brush by the pair of coil portions is the same.

  According to the brush apparatus of the said structure, a brush can be stably urged | biased from the width direction both sides of a brush by a coil part.

  The brush device according to a tenth aspect is the brush device according to the seventh or eighth aspect, wherein the urging forces applied to the brush by the pair of the coil portions are different.

  According to the brush device having the above-described configuration, since the biasing force to the brush by the pair of coil portions is set to be different, the brush is brought closer to one side in the width direction with respect to the brush holder. For this reason, generation | occurrence | production of the noise and abnormal noise at the time of the operation | movement of a motor can be efficiently suppressed with respect to the motor used only in one rotation direction.

  The brush device according to claim 11 is the brush device according to claim 7, wherein one of the pair of coil portions has an end face on one side in the width direction of the brush on the other side in the width direction of the brush. It is energizing towards.

  A brush device according to a twelfth aspect is the brush device according to the eleventh aspect, wherein an end surface on the other side in the width direction of the brush is in contact with the brush holder.

  According to the brush device having the above-described configuration, one of the pair of coil portions has a configuration in which the end surface on one side in the width direction of the brush is biased toward the other side in the width direction of the brush. The position in the circumferential direction can be stabilized. Further, in the case where the outer diameters of the pair of coil portions vary, the brush is caused by the difference between the biasing force input from one coil portion to the brush and the biasing force input from the other coil portion to the brush. May vibrate in the circumferential direction. However, with the above-described configuration of the present invention, the brush can be arranged at a desired position, thereby suppressing vibration in the circumferential direction of the brush. Moreover, since the other coil part does not urge the brush in the width direction of the brush, the tolerance of the outer diameter of the other coil part can be widened. Thereby, manufacture of a spring can be made easy. In addition, the position of the brush in the circumferential direction can be further stabilized by bringing the end face on the other side in the width direction of the brush into contact with the brush holder. Step

  A brush device according to a thirteenth aspect is the brush device according to the seventh aspect, wherein the pair of coil portions are arranged offset in the radial direction of the commutator when viewed from the thickness direction of the base plate. .

  According to the brush device having the above configuration, since the pair of coil portions are arranged offset in the radial direction of the commutator when viewed from the thickness direction of the base plate, a moment acts on the brush, and the brush is moved to the brush holder. Against one side in the width direction. For this reason, also in this case, generation of noise and abnormal noise during operation of the motor 10 can be efficiently suppressed with respect to a motor that is used in only one rotation direction.

  The brush device according to claim 14 is the brush device according to any one of claims 1 to 6, wherein the coil portion is one of the circumferential side of the commutator in the pressing portion and the other side. Is provided.

  According to the brush device having the above-described configuration, the configuration of the brush device can be simplified by using a spring having a single coil portion.

  The brush device according to claim 15 is the brush device according to any one of claims 1 to 14, wherein an angle formed between a sliding direction of the brush and an axial direction of the commutator is set to an acute angle. Yes.

  According to the brush device having the above-described configuration, a component force in the axial direction of the force input to the brush from the pressing portion of the spring is obtained by setting the angle formed by the sliding direction of the brush and the axial direction of the commutator to an acute angle. be able to. By applying a component force in the axial direction to the brush, the brush can be pressed against the base plate. Thereby, it can suppress that a brush vibrates in a brush holder.

  The brush device according to claim 16 is the brush device according to any one of claims 1 to 15, wherein a contact surface of the base plate with the brush is inclined with respect to a circumferential direction of the commutator. ing.

  According to the brush device having the above configuration, a component force in the axial direction of the force input to the brush from the coil portion of the spring can be obtained by inclining the contact surface of the brush holder with the brush as described above. . By applying a component force in the axial direction to the brush, the brush can be further pressed against the base plate. Thereby, it can suppress further that a brush vibrates in a brush holder.

  The brush device according to claim 17, wherein a brush formed in a prism shape, a base plate that is formed in an annular shape and is disposed radially outside the commutator, and an end portion of the brush opposite to the commutator are provided. A pressing portion that presses toward the commutator side, and the thickness direction of the base plate extends in the axial direction on the outer side in the width direction of the brush and extends from at least one of one side and the other side of the commutator in the pressing portion. A spring that is wound in a cylindrical shape and includes a coil portion that biases the brush inward in the width direction of the brush, and a brush holder that houses the brush slidably in the radial direction of the commutator And a holding wall for holding the coil portion between the brush and the brush accommodated in the brush holding portion, and a brush holding portion. A temporary holding portion for restricting movement of the brush to the commutator side, and the brush and the spring are attached to form a brush assembly by engaging the temporary holding portion with the brush. And a brush holder attached to the base plate.

  According to the said structure, a brush and a spring are attached to a brush holder, and a brush holder is comprised by engaging the temporary holding part of a brush holder with a brush. The brush assembly is then attached to the base plate. Thereby, a brush apparatus is assembled. Here, in the present invention, since the temporary holding portion of the brush holder is engaged with the brush, the brush does not jump out of the brush holder by the urging force of the spring, so that workability at the time of assembling the brush device is improved. be able to.

  The brush device according to claim 18 is the brush device according to claim 17, wherein the engagement between the brush and the temporary holding portion is a snap-fit structure.

  According to the brush device having the above configuration, the workability at the time of assembling the brush device can be further improved by adopting a snap-fit structure for the engagement between the brush and the temporary holding portion.

  The brush device according to claim 19 is the brush device according to claim 17 or claim 18, wherein the engaged portion that engages with the temporary holding portion is provided at an end portion on one axial side of the commutator in the brush. A pigtail that is provided and energizes the brush is connected to an end of the brush on the other axial side of the commutator.

  According to the brush device having the above configuration, the effective wear length of the brush can be ensured by setting the portion where the engaged portion is provided in the brush and the portion where the pigtail is connected as described above.

  A motor according to claim 20, wherein the motor is formed in a cylindrical shape and houses a motor yoke including an armature including the commutator fixed to a rotating shaft, a motor housing that closes an opening of the motor yoke, The permanent magnet provided in the inner peripheral surface of the motor yoke, The brush apparatus of any one of Claims 1-19 fixed to the said motor housing.

  According to the motor having the above configuration, since the brush device according to any one of claims 1 to 19 is provided, generation of noise and abnormal noise during motor operation can be suppressed.

It is the front view which expanded the principal part of the brush apparatus which concerns on embodiment of this invention. It is a front view corresponding to FIG. 1A which shows the state which removed the brush, the brush holder, and the leaf | plate spring from the state shown by FIG. 1A. It is a longitudinal section showing the whole motor to which the brush device concerning an embodiment of the invention was applied. FIG. 3 is a front view (cross-sectional view taken along line 3-3 in FIG. 2) as viewed from one axial side of a rotation shaft showing the brush device shown in FIG. 2. It is the front view seen from the plate | board thickness direction one side of the baseplate which shows the whole baseplate shown by FIG. It is a perspective view which shows the brush shown in FIG. 3, a brush holder, and a leaf | plate spring. It is the side view which looked at the state of Drawing 1A from the diameter direction outside of a base plate. It is explanatory drawing for demonstrating the force which acts on a brush from a leaf | plate spring in the state of FIG. 1A. It is a front view corresponding to Drawing 6B which shows a leaf spring etc. concerning a modification. It is an expanded sectional view which expands and shows the section which cut the brush device concerning the 1st modification along the diameter direction. It is a front view corresponding to FIG. 1A which expands and shows the principal part of the brush apparatus which concerns on a 2nd modification. It is an arrow line view which shows the principal part of the brush apparatus seen from the arrow E direction shown by FIG. It is a front view corresponding to FIG. 1A which expands and shows the principal part of the brush apparatus which concerns on a 3rd modification. It is an expansion perspective view which expands and shows the principal part of the brush apparatus which concerns on a 4th modification. It is a perspective view which shows a brush holder, a leaf | plate spring, and a brush. It is the perspective view which looked at the brush assembly from the commutator side. It is the perspective view which looked at the brush assembly from the opposite side to a commutator. FIG. 6 is an enlarged cross-sectional view showing, in an enlarged manner, a portion where the brush holder and the brush are engaged in a cross section cut along the line DD shown in FIG. 5. It is a front view corresponding to FIG. 1A which expands and shows the principal part of the brush apparatus which concerns on a 5th modification. It is a front view corresponding to FIG. 1A which expands and shows the principal part of the brush apparatus which concerns on a 6th modification.

  Hereinafter, the motor 10 to which the brush device 40 according to the embodiment of the present invention is applied will be described with reference to the drawings, and then the brush device 40 will be described.

(About motor 10)
FIG. 2 shows the motor 10 in a longitudinal sectional view. As shown in this figure, the motor 10 includes a motor yoke 12 having a substantially bottomed cylindrical shape. Two pairs of permanent magnets 14 are fixed to the inner peripheral surface of the motor yoke 12, and the permanent magnets 14 are equally spaced (every 90 °) so that the magnetic poles are alternately different along the circumferential direction of the motor yoke 12. (A pair of opposing permanent magnets have the same magnetic pole and are arranged to have a different magnetic pole from the adjacent pair of permanent magnets).

  A motor housing 16 is provided on the open end side of the motor yoke 12, and the motor housing 16 is fixed to the motor yoke 12 so as to close the open end of the motor yoke 12.

  Further, an armature 20 is accommodated in the motor yoke 12 inside the permanent magnet 14, and the armature 20 includes a rotating shaft 22, an armature core 30, and a commutator (commutator) 32. ing. The rotating shaft 22 is formed in a substantially round bar shape and is arranged coaxially with the motor yoke 12. One end portion in the axial direction of the rotating shaft 22 (the end portion in the direction of arrow A in FIG. 2) is rotatably supported on the bottom portion of the motor yoke 12 via a substantially cylindrical bearing 24. On the other hand, the other axial end portion (the end portion in the direction of arrow B in FIG. 2) of the rotating shaft 22 is rotatably supported by the motor housing 16 via a substantially cylindrical bearing 26. A connecting member 28 is press-fitted into the other axial end of the rotating shaft 22.

  The armature core 30 is fixed to the rotary shaft 22 and disposed in the motor yoke 12. The armature core 30 is formed by laminating a plurality of plate-shaped iron core plates having a plurality of teeth. The armature core 30 has a plurality of slots at equiangular intervals. The armature core 30 is successively wound in multiple turns at predetermined slots of the armature core 30 to form an armature coil.

  The commutator 32 is fixed to the portion on the other axial end side of the rotary shaft 22 by press fitting. The commutator 32 has a plurality of commutator pieces 34, and the commutator pieces 34 are arranged concentrically on the outer peripheral surface of the commutator 32. Further, each commutator piece 34 of the commutator 32 is fixed so that adjacent commutator pieces 34 are electrically insulated from each other. Corresponding windings wound for each predetermined slot of the armature coil are sequentially connected to each commutator piece. It is electrically connected to the piece 34.

  A substantially annular brush device 40 is provided between the motor housing 16 and the motor yoke 12. The brush device 40 is disposed on the radially outer side of the rotating shaft 22 with respect to the commutator 32, and the brush 70 (see FIG. 3) of the brush device 40 is rectified by the commutator 32 by an urging force of a leaf spring 80 described later. It is in contact with the child piece 34 so as to be slidable.

(About the brush device 40)
FIG. 3 shows a front view of the brush device 40 as viewed from one axial side of the rotating shaft 22 (arrow A direction side in FIG. 2). As shown in this figure, the brush device 40 includes a base plate 42, four brushes 70 that are in slidable contact with the commutator piece 34 of the commutator 32, and four brush holders that house the brushes 70. 60 and a plate spring 80 as four springs for urging the brush 70. Hereinafter, each configuration will be described.

  The base plate 42 is made of an insulating material (resin). As shown in FIG. 4, the base plate 42 has a substantially annular plate-shaped plate body 46 having a through hole 44 in the axial center. The plate body 46 is disposed coaxially with the rotary shaft 22, and the commutator 32 described above is disposed in the through hole 44.

  A pair of bosses 48 are integrally formed on one side surface of the plate main body 46 (the surface on the one side in the axial direction of the rotary shaft 22) at the outer peripheral portion. It protrudes in one direction. The bosses 48 are each formed with a circular fastening hole 48A. A screw 49 is inserted into the fastening hole 48A, and the plate body 46 (brush device 40) is fixed to the motor housing 16 by the screw 49 (see FIGS. 2 and 3).

  In addition, on one side surface of the plate main body 46, four attachment portions 50 for assembling a brush holder 60, a brush 70, and a leaf spring 80 described later are formed. The assembling portions 50 are equally spaced (90 °) in the circumferential direction of the base plate 42 corresponding to the reference lines CL passing through the axis of the plate main body 46 and orthogonal to each other when viewed from the plate thickness direction of the plate main body 46. Every).

  As shown in FIG. 1B, the assembly portion 50 has a pair of pedestal portions 52 for placing a coil portion 82 of a leaf spring 80 described later. The pair of pedestal portions 52 are configured symmetrically with respect to the reference line CL, and are formed on the inner peripheral side portion of the plate body 46. The pedestal 52 is slightly protruded from the plate body 46 to one side in the plate thickness direction of the plate body 46 and is formed in a substantially trapezoidal shape so as to be parallel to the reference line CL when viewed from the plate thickness direction of the plate body 46. Has been. Further, the protruding surface (pedestal surface) of the pedestal portion 52 is disposed along a direction orthogonal to the plate thickness direction of the plate body 46. Further, the pedestal portion 52 is formed with a notch portion 54 opened to the reference line CL side.

  Moreover, the assembly | attachment part 50 has a pair of clamping wall 56 for clamping the coil part 82 of the leaf | plate spring 80 mentioned later. The pair of holding walls 56 are configured symmetrically with respect to the reference line CL and are erected on the plate body 46. The nipping wall 56 is formed in a substantially V-shaped plate shape opened to the reference line CL side when viewed from the plate thickness direction of the plate body 46, and the pedestal 52 is adjacent to the opening side of the nipping wall 56. Are arranged. Specifically, the holding wall 56 has opposing walls 56A that face each other via the reference line CL, and the opposing walls 56A extend linearly in parallel with the reference line CL. Further, the holding wall 56 has an inclined wall 56B, and the inclined wall 56B is radially outward of the plate main body 46 (commutator 32) from one longitudinal end of the opposing wall 56A (the end opposite to the commutator 32). It is inclined in a direction approaching the reference line CL as it goes to. Further, the holding wall 56 protrudes from the pedestal portion 52 to one side in the plate thickness direction of the plate body 46, and the protruding height of the holding wall 56 from the pedestal portion 52 is larger than the width dimension of the leaf spring 80 described later. Is also set larger.

  Furthermore, the assembly part 50 has a pair of fixing holes 58 for fixing a brush holder 60 described later. The pair of fixing holes 58 are configured symmetrically with respect to the reference line CL, and are disposed on the reference line CL side with respect to the pedestal portion 52 and the holding wall 56. Further, the fixing hole 58 is formed in a substantially rectangular shape with the direction parallel to the reference line CL as the longitudinal direction.

  As shown in FIG. 1A, the brush holder 60 is disposed between the pair of pedestal portions 52 in the plate main body 46. The brush holder 60 is made of conductive sheet metal. Further, the brush holder 60 extends along the reference line CL, and is formed in a substantially U shape that is open to the plate body 46 side when viewed from the longitudinal direction. Specifically, as shown in FIG. 5, the brush holder 60 includes a top wall 60 </ b> A and a top wall 60 </ b> A in which the plate thickness direction is the axial direction of the rotation shaft 22 (the direction of arrow A and arrow B in FIG. 5). And a pair of side walls 60B bent toward the plate main body 46 side (arrow B direction side in FIG. 5).

  A fixing claw 69 is formed at the open end of the side wall 60B of the brush holder 60 at a position corresponding to the fixing hole 58 of the plate body 46 described above. Then, the fixing claw is inserted into the fixing hole 58 and bent, and the brush holder 60 is fixed to the base plate 42.

  Further, a widened portion 62 is integrally formed on the side wall 60B of the brush holder 60 at an intermediate portion in the height direction of the brush holder 60 (the direction of arrow A and the direction of arrow B in FIG. 5). The widened portion 62 protrudes slightly outward in the width direction of the brush holder 60 and is formed along the longitudinal direction of the brush holder 60. Thereby, the width dimension of the brush holder 60 is configured to be widened at the site of the widened portion 62.

  Further, a guide groove 64 is formed in the widened portion 62 of the brush holder 60 at the end on the commutator 32 side (arrow C direction side in FIG. 5), and the guide groove 64 is partially opened to the commutator 32 side. It is formed in a substantially rectangular shape. The opposing wall 56 </ b> A of the sandwiching wall 56 described above is disposed so as to face the guide groove 64, and the open end of the inclined wall 56 </ b> B of the sandwiching wall 56 is disposed adjacent to the widened portion 62. Further, the width dimension of the guide groove 64 is substantially the same as the width dimension of the widened portion 62. Accordingly, a pair of flange portions 66 are formed in the widened portion 62 at the position of the guide groove 64, and the flange portions 66 protrude from the side wall 60 </ b> B of the brush holder 60 to the outside in the width direction of the brush holder 60. The brush holder 60 is arranged side by side in the height direction.

  Further, an insertion groove 68 is formed in the top wall 60 </ b> A of the brush holder 60. The insertion groove 68 is formed along the longitudinal direction of the brush holder 60 and is open to the commutator 32 side.

  Further, a stopper wall 60 </ b> C is integrally formed on the top wall 60 </ b> A of the brush holder 60 at the end opposite to the commutator 32. The stopper wall 60C is bent at a substantially right angle from the top wall 60A to the plate body 46 side.

  The brush 70 is formed in a substantially rectangular parallelepiped shape and is accommodated in the brush holder 60 so as to be slidable in the longitudinal direction of the brush holder 60 (the radial direction of the commutator 32). The brush 70 is pressed toward the commutator 32 by a leaf spring 80 described later, and the end surface of the brush 70 on the commutator 32 side protrudes from the brush holder 60 toward the commutator 32, so that the commutator piece 34 of the commutator 32 is provided. Is slidably contacted. In a state where the brush 70 is housed in the brush holder 60, the side surface 70 </ b> A in the width direction of the brush 70 is exposed by the guide groove 64 of the brush holder 60 and faces the opposing wall 56 </ b> A of the holding wall 56. Has been placed.

  Also, one end of a pigtail 72 made of a round bar-like stranded wire having conductivity and flexibility is embedded in the end of the brush 70 opposite to the commutator 32. As shown in FIG. 6A, the pigtail 72 extends from the brush 70 to one side in the plate thickness direction of the plate body 46 (the direction of the arrow A in FIG. 6A) and is movably inserted through the insertion groove 68 of the brush holder 60. Has been. Further, the pigtail 72 is bent at an intermediate portion in the longitudinal direction and is folded back to the other side in the plate thickness direction of the plate body 46. Further, the pigtail 72 is inserted into an insertion hole 46A formed in the plate main body 46, and is drawn out to the other side surface of the plate main body 46. The other end of the pigtail 72 is connected to a power supply wiring 73 (see FIG. 3)).

  The leaf spring 80 is formed in a substantially long plate shape. At both ends in the longitudinal direction of the leaf spring 80, the leaf spring 80 is wound in a layered manner and in a substantially cylindrical shape, and the wound portion is a coil portion 82. A portion of the leaf spring 80 between the pair of coil portions 82 is a pressing portion 84, and the pressing portion 84 is connected to a portion on the outer peripheral side of the coil portion 82. That is, in other words, the pair of coil portions 82 are extended from the pressing portion 84 to the outside in the longitudinal direction of the leaf spring 80 and wound in layers. Further, the width dimension of the leaf spring 80 is set slightly smaller than the width dimension of the guide groove 64 of the brush holder 60. Further, as shown in FIG. 1A, the diameter D of the coil portion 82 of the leaf spring 80 is set larger than the distance L between the side surface 70A of the brush 70 and the opposing wall 56A of the holding wall 56. Yes. In addition, the diameter dimension of a pair of coil part 82 is set to the same dimension.

  In a state where the leaf spring 80 is assembled to the base plate 42, the pair of coil portions 82 of the leaf spring 80 are arranged on the pedestal portion 52 of the plate body 46 with the axial direction set to the plate thickness direction of the plate body 46. Respectively. Further, the leaf spring 80 is pulled out from the coil portion 82, and the pressing portion 84 of the leaf spring 80 is brought into contact with the end surface of the brush 70 opposite to the commutator 32. That is, the leaf spring 80 drawn out from the coil portion 82 passes through the guide groove 64 of the brush holder 60 and extends along the side surface 70 </ b> A of the brush 70 and the widened portion 62 of the brush holder 60 and the side surface 70 </ b> A of the brush 70. It is arranged between. And since the leaf | plate spring 80 pulled out from the coil part 82 acts so that it may be wound up by the coil part 82, the press part 84 of the leaf | plate spring 80 makes the end surface on the opposite side to the commutator 32 in the brush 70 to the commutator 32 side. It is designed to press (see arrow F1 in FIG. 6B).

  Further, as described above, since the coil portion 82 of the leaf spring 80 is placed on the pedestal portion 52, the coil portion 82 is disposed between the facing wall 56 </ b> A of the holding wall 56 and the brush 70. . Since the diameter dimension D of the coil portion 82 is set larger than the distance L between the side surface 70A of the brush 70 and the opposing wall 56A of the holding wall 56, the side surface 70A of the brush 70 and the opposing wall 56A. Thus, the coil portion 82 is sandwiched, and the coil portion 82 is configured to bend and deform inward in the radial direction. That is, a reaction force (see arrow F2 in FIG. 1A) acts on the coil portion 82 from the facing wall 56A, and the coil portion 82 urges the side surface 70A of the brush 70 inward in the width direction of the brush 70 by the reaction force. (See arrow F2 in FIG. 6B). In the present embodiment, since the diameter dimension of the pair of coil portions 82 is set to the same size, the biasing force to the brush 70 by the pair of coil portions 82 is set to be the same.

  Further, in a state where the coil portion 82 of the leaf spring 80 is placed on the pedestal portion 52, the coil portion 82 is disposed on the commutator 32 side with respect to the inclined wall 56B of the holding wall 56, and the inclined wall 56B The brush 70 is inclined outward in the radial direction of the commutator 32 (that is, in a direction away from the coil portion 82) as it goes inward in the width direction of the brush 70. Further, as described above, since the width dimension of the leaf spring 80 is set slightly smaller than the width dimension of the guide groove 64 of the brush holder 60, the leaf spring 80 drawn from the coil portion 82 is Guided by a pair of flange portions 66 of the holder 60.

  Next, the operation and effect of the present embodiment will be described.

  In the brush device 40 configured as described above, the brush holder 60 is provided on the base plate 42, and the brush 70 is accommodated in the brush holder 60 so as to be slidable in the radial direction of the commutator 32.

  A leaf spring 80 is assembled to the base plate 42. The pair of coil portions 82 of the plate spring 80 are respectively placed on the pedestal portion 52 of the plate body 46 with the axial direction being the plate thickness direction of the plate body 46. As a result, the pressing portion 84 of the leaf spring 80 presses the end surface of the brush 70 opposite to the commutator 32 toward the commutator 32. Thus, the end surface of the brush 70 on the commutator 32 side is in contact with the commutator piece 34 of the commutator 32 so as to be slidable. When the motor 10 is operated, the commutator 32 is rotated around the axis of the rotary shaft 22 together with the rotary shaft 22, and the end surface of the brush 70 on the side of the commutator 32 is brought into sliding contact with the commutator piece 34. In this state, the leaf spring 80 drawn from the coil portion 82 is disposed between the widened portion 62 of the brush holder 60 and the side surface 70A of the brush 70 so as to be along the side surface 70A of the brush 70.

  Here, a holding wall 56 is formed in the base plate 42, and an opposing wall 56 </ b> A of the holding wall 56 is disposed on the outer side in the width direction of the brush 70 with respect to the coil portion 82. Further, the diameter D of the coil portion 82 is set to be larger than the distance L between the side surface 70A of the brush 70 and the facing wall 56A. Therefore, in a state where the coil portion 82 is placed on the pedestal portion 52, the coil portion 82 is sandwiched between the side surface 70 </ b> A of the brush 70 and the opposing wall 56 </ b> A of the sandwiching wall 56, and the coil portion 82 is Bends and deforms radially inward. Thereby, a reaction force acts from the facing wall 56 </ b> A to the coil portion 82, and the coil portion 82 urges the side surface 70 </ b> A of the brush 70 inward in the width direction of the brush 70 by the reaction force. As a result, the vibration of the brush 70 in the circumferential direction of the commutator 32 (the width direction of the brush 70) is suppressed. Therefore, the generation of noise and abnormal noise during operation of the motor 10 can be suppressed.

  Further, as described above, the coil portion 82 is held between the holding wall 56 (opposing wall 56 </ b> A) formed on the base plate 42 and the side surface 70 </ b> A of the brush 70. For this reason, the movement of the coil part 82 in the circumferential direction of the commutator 32 (width direction of the brush 70) is suppressed. As a result, the generation of noise and abnormal noise between the leaf spring 80 drawn out from the coil portion 82 and the brush holder 60 is suppressed. Therefore, it is possible to further suppress the generation of noise and abnormal noise when the motor 10 is operated.

  In addition, since the coil portion 82 urges the brush 70 by holding the coil portion 82 by the holding wall 56 (opposing wall 56A) and the side surface 70A of the brush 70, the opposing wall 56A and the brush 70 By appropriately changing the distance between them and the outer diameter of the coil part 82, the urging force of the coil part 82 on the brush 70 can be easily adjusted.

  Further, the holding wall 56 includes an inclined wall 56B, and the coil portion 82 of the leaf spring 80 is disposed on the commutator 32 side with respect to the inclined wall 56B. Further, when viewed from the plate thickness direction of the plate body 46, the inclined wall 56 </ b> B is inclined outward in the radial direction of the commutator 32 (that is, in a direction away from the coil portion 82) as it goes inward in the width direction of the brush 70. For this reason, compared with the case where the inclined wall 56B extends along the width direction of the brush 70 (when the opposing wall 56A and the inclined wall 56B are orthogonal to each other), the end of the inclined wall 56B on the brush holder 60 side. The part can be arranged away from the coil part 82. Thereby, it can suppress that the leaf | plate spring 80 pulled out from the coil part 82 hits the edge part by the side of the brush holder 60 of the inclined wall 56B. As a result, it is possible to suppress the generation of noise and abnormal noise between the leaf spring 80 and the inclined wall 56B (the holding wall 56).

  In addition, coil portions 82 are respectively formed at both ends in the longitudinal direction of the leaf spring 80. Thereby, the brush 70 can be urged from both sides in the width direction of the brush 70 by the pair of coil portions 82.

  Further, the biasing force to the brush 70 by the pair of coil portions 82 is set to be the same. Thereby, the brush 70 can be stably urged from both sides in the width direction of the brush 70 by the coil portion 82.

  In this embodiment, the holding wall 56 is formed on the base plate 42, but the holding wall 56 may be formed on the side wall 60 </ b> B of the brush holder 60. That is, the end wall on the side of the commutator 32 in the side wall 60B may be cut and raised to form the holding wall 56.

  In the present embodiment, the sandwiching wall 56 includes the opposing wall 56A and the inclined wall 56B, but the opposing wall 56A in the sandwiching wall 56 may be omitted. Specifically, the inclined wall 56B may be extended in a direction approaching the commutator 32, and the coil portion 82 of the leaf spring 80 may be sandwiched between the inclined wall 56B and the brush 70.

  Further, in the present embodiment, a pair of coil portions 82 is formed on the leaf spring 80, and the coil portions 82 constitute both longitudinal ends of the leaf spring 80. Instead of this, one of the pair of coil portions 82 may be omitted as in a brush device 90 according to a second modification described in detail later. In this case, for example, the end portion of the leaf spring 80 from which the coil portion 82 is omitted is formed in a substantially U shape when viewed from the plate thickness direction of the plate body 46, and the brush 70 is opposite to the commutator 32. You may comprise an edge part so that it may engage in the said edge part of the leaf | plate spring 80. FIG. In this case, the brush 70 is brought close to the brush holder 60 on one side in the width direction. For this reason, the self-excited vibration of the brush 70 can be suppressed. Moreover, generation of noise and abnormal noise during operation of the motor 10 can be efficiently suppressed with respect to a motor used in only one direction of rotation.

  Further, in the present embodiment, the urging force to the brush 70 by the pair of coil portions 82 is set to be the same, but the urging force to the brush 70 by the pair of coil portions 82 is set to be different. May be. For example, the diameter dimension D of the pair of coil portions 82 may be set differently, or the distance L between the pair of opposing walls 56A and the brush 70 may be set differently. Also in this case, the brush 70 is brought close to the brush holder 60 on one side in the width direction. For this reason, the self-excited vibration of the brush 70 can be suppressed. Moreover, generation of noise and abnormal noise during operation of the motor 10 can be efficiently suppressed with respect to a motor used in only one direction of rotation.

  Further, in the present embodiment, the pedestal portion 52 and the holding wall 56 are configured symmetrically with respect to the reference line CL. That is, the pedestal portion 52 and the holding wall 56 are arranged in the same position in the radial direction of the commutator 32 when viewed from the plate thickness direction of the plate body 46. Instead of this, the pedestal 52 and the holding wall 56 may be offset in the radial direction of the commutator 32 when viewed from the plate thickness direction of the plate body 46. That is, as shown in FIG. 7, the pair of coil portions 82 may be arranged offset in the radial direction of the commutator 32 when viewed from the thickness direction of the base plate 42. In this case, a moment acts on the brush 70 by the urging force from the coil portion 82 acting on the brush 70, and the brush 70 is brought closer to one side in the width direction with respect to the brush holder. For this reason, also in this case, the self-excited vibration of the brush 70 can be suppressed. Moreover, generation of noise and abnormal noise during operation of the motor 10 can be efficiently suppressed with respect to a motor used in only one direction of rotation.

(Brush device according to first modification)
Next, a brush device 86 according to a first modification of the above embodiment will be described with reference to FIG. In addition, about the member and part which have the same function as the said embodiment, the code | symbol same as the said embodiment is attached | subjected and the description is abbreviate | omitted.

  FIG. 8 shows a cross-sectional view of a main part of a brush device 86 according to this modification. As shown in this figure, in the brush device 86 according to this modification, the angle θ formed by the sliding direction of the brush 70 (arrow F direction) and the axial direction of the commutator 32 (arrow A and arrow B directions) is an acute angle. It is characterized by being set. Specifically, the assembly portion 50 formed on the plate main body 46 is inclined to one side in the axial direction as compared with the above embodiment. As a result, the pedestal portion 52 (pedestal surface) on which the coil portion 82 of the leaf spring 80 is placed and the contact surface 88 with which the bottom surface 70B of the brush 70 contacts in the assembly portion 50 are in the radial direction of the commutator 32 (direction of arrow G ).

  According to the brush device 86 of this modification described above, the angle θ formed by the sliding direction of the brush 70 and the axial direction of the commutator 32 is set to an acute angle, so that the input from the pressing portion 84 of the leaf spring 80 to the brush 70. The component force F3 in the axial direction and the component force F4 in the radial direction of the applied force F1 can be obtained. The axial force component F <b> 3 is applied to the brush 70, whereby the brush 70 can be pressed against the contact surface 88. Thereby, it can suppress that the brush 70 vibrates in the brush holder 60 (refer FIG. 1A).

(Brush device according to second modification)
Next, a brush device 90 according to a second modification of the embodiment will be described with reference to FIGS. 9 and 10. In addition, about the member and part which have the same function as the said embodiment etc., the code | symbol same as the said embodiment etc. is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 9, the brush device 90 according to this modification is characterized in that it includes a leaf spring 92 as a spring having a single coil portion 82. Specifically, a coil portion 82 wound in the same manner as in the above embodiment is provided on one side in the longitudinal direction of the pressing portion 84. Further, on the other side in the longitudinal direction of the pressing portion 84, there is provided an engaging portion 94 extending along the side surface 70A of the brush 70 and having a tip portion formed in a convex shape on the brush 70 side. 94 is engaged with an engaged portion 70 </ b> C formed at the end of the brush 70 opposite to the commutator 32.

  The assembly part 96 to which the brush 70 and the leaf spring 92 are assembled includes a clamping wall 98 corresponding to the clamping wall 56 of the above embodiment. The sandwiching wall 98 includes an opposing wall 56A and an inclined wall 56B configured in the same manner as in the above embodiment. In addition, the clamping wall 98 includes a first side wall 98A extending along the side surface 70A on one side of the brush 70 from the end of the inclined wall 56B (the end opposite to the commutator 32), and the other end of the brush 70. The second side wall 98B extends along the side surface 70A and is disposed to face the opposing wall 56A, the inclined wall 56B, and the first side wall 98A. The clamping wall 98 includes a connection wall 98C that extends along the end of the brush 70 opposite to the commutator 32 and connects the first side wall 98A and the second side wall 98B. In the assembly portion 96 described above, the brush 70 to which the leaf spring 92 is attached is assembled to a portion surrounded by the opposing wall 56A, the inclined wall 56B, the first side wall 98A, the second side wall 98B, and the connection wall 98C. Yes.

  In the present modification, as in the first modification (see FIG. 8), the angle formed by the sliding direction of the brush 70 and the axial direction of the commutator 32 is set to an acute angle. In addition to this, as shown in FIG. 10, the contact surface 88 with which the bottom surface 70 </ b> B of the brush 70 contacts and the pedestal portion 52 (pedestal surface) on which the coil portion 82 is placed are arranged in the circumferential direction of the commutator 32 (arrow H Direction). Thereby, the contact surface 88 which the bottom face 70B of the brush 70 contacts comes to be located in the other axial side (arrow B direction) with respect to the base part 52 (base surface) on which the coil part 82 is mounted. Yes.

  In this modified example described above, the configuration of the brush device 90 can be simplified by using the leaf spring 92 having the single coil portion 82.

  Further, in the present modification, the contact surface 88 with which the bottom surface 70B of the brush 70 contacts and the pedestal portion 52 on which the coil portion 82 is placed are inclined as described above, so that the brush 70 is removed from the coil portion 82 of the leaf spring 92. The component force F5 in the axial direction and the component force F6 in the circumferential direction can be obtained. When the component force F5 in the axial direction is applied to the brush 70, the brush 70 can be pressed against the contact surface 88. Thereby, it can suppress that the brush 70 vibrates in the brush holder 60 (refer FIG. 1A).

  In this modification, the example in which the holding wall 98 is configured by the facing wall 56A, the inclined wall 56B, the first side wall 98A, the second side wall 98B, and the connection wall 98C has been described, but the present invention is not limited to this. For example, like the brush device 100 according to the third modification shown in FIG. 11, the holding wall 102 that does not include the facing wall 56 </ b> A may be used.

(Brush device according to the fourth modification)
Next, a brush device 104 according to a fourth modification of the above embodiment will be described with reference to FIGS. In addition, about the member and part which have the same function as the said embodiment, the code | symbol same as the said embodiment is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 12, the brush device 104 according to this modification is characterized by being configured by attaching a brush assembly 106 to a base plate 42. Specifically, as shown in FIGS. 13 to 15, the brush assembly 106 includes a brush 70 and a leaf spring 80 attached to the brush holder 114, and the brush holder 114 and the brush 70 are engaged with each other. It is constituted by.

  The brush holder 114 is provided at a brush holding portion 108 that accommodates the brush 70 so as to be slidable in the radial direction of the commutator 32, and an end portion of the brush holding portion 108 on the commutator 32 side, and the brush 70 accommodated in the brush holding portion 108. And a pair of clamping walls 56 that sandwich the coil portion 82 of the leaf spring 80. The top wall 60A of the brush holding portion 108 (the end portion on one axial side of the commutator 32) is connected (embedded) to the top surface 70D of the brush 70 (the end surface on one axial side of the commutator 32 in the brush 70). An insertion groove 68 through which the pigtail 72 is inserted is formed. In addition, four fixing claws 69 that are fixed to four fixing holes (not shown) formed in the base plate 42 are provided at the other axial end of the commutator 32 (see FIG. 2 and the like) in the brush holding portion 108. It has been. Further, a temporary holding portion 110 that engages with an engaged portion 70E provided on the brush 70 is provided at the end of the brush holding portion 108 on the other side in the axial direction of the commutator 32 and on the opposite side of the commutator 32. Yes. The temporary holding portion 110 has a snap-fit structure that engages with the engaged portion 70E by the elastic force of the temporary holding portion 110. Further, at the end of the holding wall 56 of the brush holder 114 on the side of the commutator 32, the coil portion 82 of the leaf spring 80 held between the brush 70 accommodated in the brush holding portion 108 moves to the side of the commutator 32. An auxiliary wall 112 that restricts the operation is provided. A portion of the auxiliary wall 112 opposite to the commutator 32 is inclined so as to go inward in the width direction of the brush 70 toward the commutator 32 side. Further, a portion of the auxiliary wall 112 on the commutator 32 side is inclined so as to go outward in the width direction of the brush 70 toward the commutator 32 side.

  As shown in FIGS. 13 and 16, the engaged portion to which the temporary holding portion 110 provided in the brush holding portion 108 is engaged with the end portion of the bottom surface 70 </ b> B of the brush 70 opposite to the commutator 32. 70E is formed. When the temporary holding part 110 provided in the brush holding part 108 is engaged with the engaged part 70E, the commutator 32 side of the brush 70 accommodated in the brush holding part 108 in a state where the brush assembly 106 is assembled. Movement to is regulated. Further, a corner portion on the opposite side of the commutator 32 from the portion where the engaged portion 70E is provided on the bottom surface 70B of the brush 70 is a chamfered portion 70F which is chamfered. By providing the chamfered portion 70F on the brush 70, when the engagement between the temporary holding portion 110 provided on the brush holding portion 108 and the engaged portion 70E is released, the temporary holding portion 110 and the brush 70 are removed. Is prevented from contacting.

  According to the brush device 104 according to this modification described above, the brush 70 and the leaf spring 80 are attached to the brush holder 114, and the temporary holding portion 110 of the brush holder 114 is engaged with the engaged portion 70E of the brush 70. Thus, the brush assembly 106 is configured. Next, the brush assembly 106 is attached to the base plate 42. Thereby, the brush apparatus 104 is assembled. Here, in this modified example, the temporary holding portion 110 of the brush holder 114 is engaged with the brush 70, so that the brush 70 does not jump out of the brush holder 114 due to the urging force of the leaf spring 80. Workability at the time of assembly can be improved.

  In the present modification, the engagement between the engaged portion 70E of the brush 70 and the temporary holding portion 110 has a snap fit structure, so that the workability at the time of assembling the brush device 104 can be further improved. it can.

  Furthermore, in this modification, the pigtail 72 is connected to the top surface 70D of the brush 70, and the engaged portion 70E is formed on the bottom surface 70B of the brush 70. Therefore, compared to the case where the pigtail 72 is connected to the top surface 70D of the brush 70 and the engaged portion 70E is formed on the top surface 70D of the brush 70, the effective wear length of the brush is ensured (longer). can do.

  In this modification, the brush holder 114 is provided with an auxiliary wall 112 that restricts the movement of the coil portion 82 of the leaf spring 80 toward the commutator 32. As a result, the leaf spring 80 can be prevented from coming out of the brush holder 114. In particular, it is possible to effectively suppress the leaf spring 80 from coming out of the brush holder 114 when the brush 70 is worn and the size of the brush 70 is shortened. Further, by providing the auxiliary wall 112, it is possible to suppress the leaf spring 80 from coming off from the brush holder 114 when the brush assembly 106 is assembled.

(Brush device according to fifth modification)
Next, a brush device 116 according to a fifth modification of the embodiment will be described with reference to FIG. In addition, about the member and part which have the same function as the said embodiment etc., the code | symbol same as the said embodiment is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 17, in the brush device 116 according to this modification, one coil portion 82 of the pair of coil portions 82 of the leaf spring 80 is between the brush 70, the opposing wall 56 </ b> A, and the inclined wall 56 </ b> B. The other coil portion 82 of the pair of coil portions 82 of the leaf spring 80 is in contact with the horizontal wall 118 while being sandwiched.

  The horizontal wall 118 extends in the width direction of the brush 70 and has a surface directed in the longitudinal direction of the brush 70, and the horizontal wall 118 has the other of the pair of coil portions 82 of the leaf spring 80. The end of the coil portion 82 opposite to the commutator 32 is in contact. Accordingly, one of the pair of coil portions 82 urges the end surface (one side surface 70A) on one side in the width direction of the brush 70 toward the other side in the width direction of the brush 70, and A biasing force to one side in the width direction of the brush 70 is not input from the other coil portion 82 of the coil portion 82 to the other end surface (the other side surface 70A) of the brush 70 in the width direction.

  In this modification, the end surface (the other side surface 70A) on the other side in the width direction of the brush 70 is in contact with the side wall 60B of the brush holder 120, and the end surface on the one side in the width direction of the brush 70 (the one side surface). 70A) does not come into contact with the side wall 60B of the brush holder 120.

  Furthermore, in this modification, the central portion in the circumferential direction of the commutator 32 (the central portion in the width direction of the brush 70) in the pressing portion 84 of the leaf spring 80 is formed in a convex shape toward the commutator side.

  According to the brush device 116 according to the present modification described above, one coil portion 82 of the pair of coil portions 82 has one end surface (one side surface 70 </ b> A) in the width direction of the brush 70 in the width direction of the brush 70. By setting it as the structure urged | biased toward the other side, the position of the circumferential direction of the brush 70 can be stabilized. In addition, the circumferential position of the brush 70 can be further stabilized by bringing the end face on the other side in the width direction of the brush 70 (side face 70A on the other side) into contact with the side wall 60B of the brush holder 120. .

  In the present modification, the pressing portion 84 of the leaf spring 80 is formed as described above, so that the pressing portion 84 of the leaf spring 80 can press the central portion in the width direction of the brush 70. Accordingly, the brush 70 can be urged toward the commutator in a stable state. In the configuration in which the pressing portion 84 of the leaf spring 80 presses only both end portions in the width direction of the brush 70, the load input from the pressing portion 84 to one end portion in the width direction of the brush 70 and the brush 70. Since a difference from the load input to the other end portion in the width direction is likely to occur, it is conceivable that the posture of the brush 70 becomes unstable when the brush 70 is pressed by the pressing portion 84. In this respect, the configuration of the present modification is excellent from the viewpoint of stabilizing the posture of the brush.

(Brush devices according to sixth and seventh modifications)
Next, a brush device 122 according to a sixth modification of the embodiment will be described with reference to FIG. In addition, about the member and part which have the same function as the said embodiment etc., the code | symbol same as the said embodiment is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 18, in the brush device 122 according to the sixth modification, instead of the inclined wall 56 </ b> B of the brush device 116 (see FIG. 17), the brush device extends in the width direction of the brush 70. A feature is that a horizontal wall 118 having a surface directed in the longitudinal direction of the brush 70 is provided.

  According to the brush device 122 according to the sixth modification described above, the position in the circumferential direction of the brush 70 can be further stabilized as in the brush device 116 according to the fifth modification described above. In this modification, the frictional force of the contact portion between one coil portion 82 and the horizontal wall 118 is set to the frictional force of the one coil portion 82 and the inclined wall 56B and the contact portion (see FIG. 17). It can be changed (adjusted).

  In the above-described embodiment and modification, the example in which the brush devices 40, 86, 90, 100, 104, 116, and 122 are configured using the plate springs 80 and 92 formed in a plate shape has been described. The invention is not limited to this, and for example, the brush device can be configured using a linear spring.

  Moreover, a brush apparatus can also be comprised combining each structure of the said embodiment and modification.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be implemented without departing from the spirit of the present invention. Of course.

DESCRIPTION OF SYMBOLS 10 ... Motor, 12 ... Motor yoke, 14 ... Permanent magnet, 16 ... Motor housing, 20 ... Armature, 22 ... Rotating shaft, 32 ... Commutator, 40 ... Brush device, 42 ... base plate, 56 ... holding wall, 56B ... inclined wall 60 ... brush holder, 70 ... brush, 70E ... engaged portion, 72 ... pigtail 80 ... leaf spring (spring), 82 ... coil part, 84 ... pressing part, 86 ... brush device, 88 ... contact surface with brush, 90 ... brush device, 92 ... Plate spring (spring), 98 ... Holding wall, 100 ... Brush device, 102 ... Holding wall, 104 ... Brush device, 106 ... Brush assembly, 108 ... Brush Holding part, 110 ... Temporary holding part, 112 ... Auxiliary wall 114 ... brush holder, 116 ... brush device, 122 ... brush device, the sliding direction of F ... brush

Claims (20)

A brush shaped like a prism,
A base plate formed in an annular shape and disposed radially outside the commutator;
A brush holder that is provided on the base plate and accommodates the brush slidably in the radial direction of the commutator;
The brush is extended from at least one of a pressing portion that presses at least a central portion of the end surface of the brush opposite to the commutator toward the commutator, and at least one of one side and the other side of the commutator in the pressing portion. A coil portion wound around the outer side in the width direction of the brush in a cylindrical shape whose axial direction is the thickness direction of the base plate and biasing the brush toward the inner side in the width direction of the brush; ,
Brush device with   2. The brush device according to claim 1, wherein the brush holder or the base plate has a nipping wall formed on the outer side in the width direction of the brush, and the coil portion is nipped by the nipping wall and the brush. The sandwiching wall includes an inclined wall,
When viewed from the thickness direction of the base plate, the inclined wall is disposed on the radially outer side of the commutator with respect to the coil portion, and further toward the inner side in the width direction of the brush as it goes radially outward of the commutator. The brush device according to claim 2, wherein the brush device is inclined toward the surface. The clamping wall is configured to include an opposing wall,
The said opposing wall is formed in the radial direction outer side of the said commutator with respect to the said brush seeing from the plate | board thickness direction of the said base plate, and is formed in parallel with the radial direction of the said commutator. Brush device. An auxiliary wall is provided at the end of the clamping wall on the commutator side,
The brush device according to claim 2, wherein movement of the coil portion toward the commutator side is restricted by the coil portion coming into contact with the auxiliary wall.   The brush device according to any one of claims 1 to 5, wherein a central portion in a circumferential direction of the commutator in the pressing portion is formed in a convex shape toward the commutator side.   The brush device according to any one of claims 1 to 6, wherein the coil portions are respectively provided on one side and the other side of the commutator in the pressing portion.   The brush device according to claim 7, wherein the pair of coil portions are in contact with both end faces of the brush in the width direction.   The brush device according to claim 7 or 8, wherein a biasing force to the brush by the pair of coil portions is set to be the same.   The brush device according to claim 7 or 8, wherein the biasing force to the brush by the pair of coil portions is set to be different.   The brush device according to claim 7, wherein one of the pair of coil portions urges an end surface on one side in the width direction of the brush toward the other side in the width direction of the brush.   The brush device according to claim 11, wherein an end face on the other side in the width direction of the brush is in contact with the brush holder.   The brush device according to claim 7, wherein the pair of coil portions are arranged offset in the radial direction of the commutator when viewed from the thickness direction of the base plate.   The brush device according to any one of claims 1 to 6, wherein the coil portion is provided on one side and the other side in the circumferential direction of the commutator in the pressing portion.   The brush device according to any one of claims 1 to 14, wherein an angle formed by a sliding direction of the brush and an axial direction of the commutator is set to an acute angle.   The brush device according to any one of claims 1 to 15, wherein a contact surface of the base plate with the brush is inclined with respect to a circumferential direction of the commutator. A brush shaped like a prism,
A base plate formed in an annular shape and disposed radially outside the commutator;
A pressing portion that presses an end of the brush opposite to the commutator toward the commutator, and extends from at least one of one side and the other side of the commutator in the pressing portion and the brush. A coil portion wound around the outer side in the width direction in a cylindrical shape in which the thickness direction of the base plate is an axial direction and biasing the brush toward the inner side in the width direction of the brush;
A brush holding part that accommodates the brush so as to be slidable in the radial direction of the commutator, a clamping wall that clamps the coil part between the brush accommodated in the brush holding part, and a brush holding part. A temporary holding portion for restricting movement of the brush toward the commutator side, and the brush and the spring are attached to form a brush assembly by engaging the temporary holding portion with the brush. A brush holder attached to the base plate;
Brush device with   The brush device according to claim 17, wherein the engagement between the brush and the temporary holding portion has a snap-fit structure. An engaged portion that engages with the temporary holding portion is provided at an end portion on one axial side of the commutator in the brush,
The brush device according to claim 17 or 18, wherein a pigtail for energizing the brush is connected to an end of the brush on the other axial side of the commutator. A motor yoke that is formed in a cylindrical shape and that houses an armature including the commutator fixed to a rotating shaft;
A motor housing that closes the opening of the motor yoke;
A permanent magnet provided on the inner peripheral surface of the motor yoke;
The brush device according to any one of claims 1 to 19, which is fixed to the motor housing;
With motor.