JP2019009893A - motor - Google Patents

Abstract

To provide a motor having a structure in which a short circuit of an electric power supply terminal due to a foreign matter such as an abrasion powder or the like of an electric power supply brush hardly occurs.SOLUTION: Electric power supply terminals 26 and 27 are arranged so as to be along both side walls of a mounted convex part 20m provided to an end bracket 20, and a mounting member 30 is interposed between the electric power supply terminals 26 and 27 in the mounted convex part 20m. Opposite surfaces of the mounting member 30 and the mounted convex part 20m are structured by a labyrinth structure of a mode with ribs 30g, 30h, and 30i and convex parts 20p and 20q which are alternately entered to between the electric power supply terminals 26 and 27.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a motor with a brush.

  In a motor with a brush, a power supply brush contacts an outer peripheral surface of a commutator provided in an armature (rotor), and power is supplied to the coil of the armature through the power supply brush and the commutator. The motor brush is driven by the brush for sliding relative to the outer peripheral surface of the commutator (see, for example, Patent Document 1).

JP 2014-87206 A

  By the way, in a motor with a brush, when the power supply brush is slidably contacted with the outer peripheral surface (segment) of the commutator, foreign matter such as wear powder of the power supply brush that is mainly generated is one of the factors that hinders the motor life. ing. For example, in the case of supplying power to the power supply brush from the outside through a power supply terminal arranged in the motor, such as the motor of Patent Document 1, foreign matter such as abrasion powder of the power supply brush is present between the pair of power supply terminals. When deposited, a short circuit occurs between the pair of power supply terminals, which may cause a short circuit failure of the motor.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a motor having a structure in which short-circuiting of a power feeding terminal due to foreign matters such as abrasion powder of a power feeding brush hardly occurs. .

  A motor that solves the above problem supplies power to an armature that is rotatably accommodated in a housing member through a power supply brush that can be slidably contacted with an outer peripheral surface of a commutator provided in the armature. A motor configured to supply power to the power supply brush through a pair of power supply terminals arranged in the housing member so as to follow both side walls of the concave portion provided in the housing member Each of the pair of power supply terminals is provided with a mounting member interposed between the pair of power supply terminals in the concave portion, and the opposing surfaces of the mounting member and the concave portion are: The labyrinth structure is configured such that convex portions alternately enter between the pair of power supply terminals.

  According to the above configuration, the pair of power supply terminals is arranged along both side walls of the concave portion provided in the housing member, and the mounting member is interposed between the pair of power supply terminals in the concave portion. The facing surfaces of the mounting member and the concave portion are configured by a labyrinth structure in which the convex portions alternately enter between the pair of power supply terminals. Therefore, it is difficult for foreign matter such as abrasion powder of the power supply brush to enter between the pair of power supply terminals, and even if foreign matter such as wear powder enters and accumulates between the pair of power supply terminals, the mutual space length is long. Therefore, a short circuit is unlikely to occur.

In the motor described above, the mounting member is disposed at a radial position of the commutator.
According to the above configuration, when the mounting member is applied to a motor having a configuration in which the mounting member is arranged at the radial position of the commutator, the motor axial direction is substantially horizontal and the mounting member is positioned below the commutator. When the mounting posture is adopted, there is a situation in which foreign matter such as abrasion powder of the power supply brush falls more around the mounting member. Therefore, it is significant to have a structure in which foreign matter such as wear powder of the power supply brush does not easily enter between the pair of power supply terminals, and a structure in which short circuit does not easily occur even if foreign matter such as wear powder enters and accumulates.

In the motor described above, a dish-like portion on which foreign matter such as wear powder of the power feeding brush can be accumulated is provided at a portion of the mounting member facing the commutator.
According to the above configuration, since foreign matter such as wear powder of the power supply brush can be deposited on the dish-like portion provided on the mounting member facing the commutator, wear powder or the like between the pair of power supply terminals can be obtained. Intrusion of foreign matter can be suppressed.

In the motor described above, the dish-shaped portion is configured such that the peripheral portion is higher than the central portion.
According to the above configuration, by making the peripheral part higher than the central part of the dish-like part, foreign matters such as abrasion powder of the power feeding brush are less likely to fall, and foreign substances such as abrasion powder easily accumulate. Intrusion of foreign matter such as wear powder between the pair of power supply terminals can be further suppressed.

  According to the motor of the present invention, it is possible to make it difficult to cause a short circuit of the power supply terminal due to foreign matters such as wear powder of the power supply brush.

It is a longitudinal cross-sectional view of the motor in one Embodiment. It is a front view which shows the inner surface of an end bracket. It is sectional drawing which saw the mounting member from the radial inside (II of FIG. 2). It is sectional drawing (III-III of FIG. 5) which shows the structure of the bottom face part of a mounting member. It is sectional drawing (II-II of FIG. 4) which shows the structure of the bottom face part of a mounting member. It is a top view which shows the inner surface of the end bracket in another example. It is sectional drawing which looked at the mounting member from the radial direction inner side.

Hereinafter, an embodiment of the motor will be described.
A motor 10 according to this embodiment shown in FIG. 1 is used as a drive source for a power seat device of a vehicle, and tilts each mechanism portion of the seat, for example, a mechanism portion that slides the seat back and forth and a seat backrest portion. This is a DC motor with a brush that is installed in a mechanical unit or the like.

  The yoke housing 11 of the motor 10 is made of magnetic metal and has a substantially bottomed cylindrical shape. A field magnet 12 is fixed to the inner peripheral surface of the yoke housing 11. An armature 13 is rotatably accommodated inside the field magnet 12. The armature 13 includes a rotating shaft 14, a core 15 fixed to the rotating shaft 14, a winding 16 wound around the core 15, and a tip side from the core 15 (opening 11 a side of the yoke housing 11 side). ) And a commutator 17 connected to the winding 16. The armature 13 is rotatably supported by a bearing 18 whose base end portion of the rotating shaft 14 is held by a bearing holding portion 11 b at the center of the bottom portion of the yoke housing 11. An end bracket 20 is fixed to the opening 11a of the yoke housing 11 so as to substantially close the opening 11a in a state where the armature 13 is accommodated.

  As shown in FIGS. 1 and 2, the end bracket 20 is made of resin and has a substantially disk shape that can close the opening 11 a of the yoke housing 11. A through hole 20a into which the tip of the rotating shaft 14 is inserted is formed at the center of the end bracket 20, and the tip of the rotating shaft 14 is rotatably supported by a bearing 21 held in the through hole 20a. Has been. The distal end portion of the rotating shaft 14 is connected to the connecting portion of the load device (seat-side mechanism portion) through the through-hole 20 a of the end bracket 20.

  As shown in FIG. 2, four fixing portions 20 b are formed on the outer peripheral portion of the end bracket 20 so as to protrude radially outward and be fixed to the load device. Among them, a connector portion 20c is integrally formed between a pair of adjacent fixing portions 20b. Incidentally, the mounting manner of the motor 10 of the present embodiment to the load device is mounting in such a posture that the rotating shaft 14 is substantially horizontal and the connector portion 20c faces downward. The connector portion 20c located on the lower side has a substantially rectangular tube shape so that an external connector (not shown) extending from the control device is fitted along the axial direction of the motor 10 (front and rear direction in FIG. 2). Part 20d.

  A pair of power supply brushes 22, 23 are held on the inner side surface of the end bracket 20 by the brush holders 20 e, 20 f so as to be movable in the radial direction, and the power supply brushes 22, 23 are respectively connected to the outer peripheral surface of the commutator 17. There are provided torsion coil springs 24 and 25 which are urged radially inward to be pressed against each other. Each of the power supply brushes 22 and 23 is disposed at an interval of 90 ° in the circumferential direction in a region opposite to the connector portion 20c with respect to the axis center of the motor 10 (an upper region in FIG. 2). Torsion coil springs 24 and 25 are supported by support column portions 20g and 20h in a 90 ° region between the power supply brushes 22 and 23.

  In addition, power supply terminals 26 and 27 and a thermistor 28 are incorporated in a region on the inner surface of the end bracket 20 on the connector portion 20c side (lower region in FIG. 2). On the inner side surface of the end bracket 20, an accommodation recess 20 i that is concave in the axial direction is formed in a range from the periphery of the bearing 21 to the connector portion 20 c (cylindrical portion 20 d). A thermistor holding portion 20j and terminal holding portions 20k and 20l are formed in the housing recess 20i.

  The thermistor 28 has a substantially rectangular plate shape, and is held by the thermistor holding part 20j so that its own plane is along the axial direction of the motor 10 (the front and back direction in FIG. 2). The thermistor 28 is positioned on the left side of the lower region in FIG. 2 on the inner side surface of the end bracket 20, that is, on the brush holder 20 e side that holds the power supply brush 22. One terminal 28a of the thermistor 28 is electrically connected to the power supply brush 22 via a pigtail 22a.

  The power supply terminals 26 and 27 are arranged so as to be divided into the left side and the right side of the lower region in FIG. 2 on the inner side surface of the end bracket 20, and the terminals are provided along the left side wall and the right side wall of the receiving recess 20i, respectively. It is held by holding parts 20k and 20l. One end portion 26a of the power supply terminal 26 is connected to the other terminal 28b of the thermistor 28, that is, connected to the power supply brush 22 via the thermistor 28 and the pigtail 22a. One end portion 27a of the power supply terminal 27 is connected to the power supply brush 23 through a pigtail 23a. The other end portions 26b, 27b of the power supply terminals 26, 27 stand up along the axial direction of the motor 10 in the cylindrical portion 20d of the connector portion 20c, and function as connection terminals (see FIG. 1).

  A mounting member 30 is mounted in the housing recess 20 i of the end bracket 20. The housing recess 20i has a substantially rectangular parallelepiped mounting recess 20m extending along the radial direction of the end bracket 20 (motor 20) to the cylindrical portion 20d of the connector portion 20c, and has a substantially rectangular parallelepiped shape with respect to the mounting recess 20m. A mounting member 30 is mounted. In the mounting recess 20m, a part of the power supply terminals 26 and 27 arranged along the left side wall and the right side wall thereof are in a parallel state.

  As shown in FIG. 1, the mounting member 30 has locking claws 30a and 30b at the radially inner end and the radially outer end of the end bracket 20 (motor 20) in the mounted state with respect to the mounting recess 20m. doing. The end bracket 20 is provided with locking holes 20n, 20o for locking the locking claws 30a, 30b, and the mounting member 30 has locking holes 20n, 20o of its own locking claws 30a, 30b. It is attached to the end bracket 20 by locking. Incidentally, if the engagement of the engagement claws 30a, 30b with the engagement holes 20n, 20o is released, the mounting member 30 can be detached from the end bracket 20.

  As shown in FIGS. 1 to 3, the mounting member 30 has a dish-like portion 30 c at the radially inner end. The dish-shaped portion 30c is slightly longer than the commutator 17 in the axial direction of the motor 10 (see FIG. 1), and the length in the direction perpendicular to the axis is substantially rectangular so as to be substantially the same as the diameter of the commutator 17 (see FIG. 2). I am doing. The dish-like portion 30c has a shape having inclined portions 30e whose both sides of the central flat portion 30d along the direction perpendicular to the axis of the motor 10 are obliquely upward on the outside.

  That is, the dish-like portion 30 c is located below the commutator 17, and suppresses intrusion of foreign matters such as abrasion powders of the power supply brushes 22 and 23 generated when sliding with the outer peripheral surface of the commutator 17. It also functions as a saucer for receiving power, and also has a function of increasing the space length (creeping distance) between the power supply terminals 26 and 27 located on the connector portion 20c side from itself. In addition, the inclined portions 30e on both sides of the dish-shaped portion 30c suppress the fall of foreign matter such as wear powder on the feeding brushes 22 and 23 as much as possible, and deposit from the central flat portion 30d of the dish-shaped portion 30c to the inclined portion 30e. The structure is easy to do.

  The main body portion 30f of the mounting member 30 is inserted in a manner that substantially fits into the mounting recess 20m of the end bracket 20. As shown in FIGS. 4 and 5, in the mounting recess 20m, power supply terminals 26 and 27 are arranged on the left and right side walls, respectively, so that the main body 30f of the mounting member 30 is for power supply. It is interposed between terminals 26 and 27. In other words, the power supply terminals 26 and 27 are interposed between the left and right side surfaces of the main body 30f of the mounting member 30 and the left and right side walls of the mounting recess 20m, respectively.

  As shown in FIG. 5, ribs 30g, 30h, and 30i are provided on the left side, the center, and the right side on the bottom surface of the main body 30f of the mounting member 30 (the surface facing the bottom surface of the mounting recess 20m). Yes. Correspondingly, a convex portion 20p inserted between the ribs 30g and 30h and a convex portion 20q inserted between the ribs 30h and 30i are provided on the bottom surface of the mounting concave portion 20m. In other words, the tip of the central rib 30h is inserted into the recess 20r between the protrusions 20p and 20q, and the tip of the left rib 30g is inserted into the recess 20s provided on the outside (left side) of the protrusion 20p. The tip of the rib 30i on the right side is inserted into the recess 20t provided on the outside (right side) of the projection 20q. Incidentally, the tip portions of the left and right ribs 30g, 30i slightly protrude downward from the tip of the central rib 30h, and correspondingly, the left and right recesses 20s, 20t The bottom surface is at a position lower than the bottom surface of the recess 20r at the center.

  As described above, the ribs 30g, 30h, and 30i fit into the recesses 20s, 20r, and 20t between the bottom surface of the main body 30f of the mounting member 30 and the bottom surface of the mounting recess 20m, and the ribs 30g, It has a labyrinth structure in which the convex portions 20p and 20q enter between 30h and 30i. Therefore, foreign matter such as wear powder of the power supply brushes 22 and 23 hardly enters between the power supply terminals 26 and 27, that is, between the bottom surface of the main body 30f of the mounting member 30 and the bottom surface of the mounting recess 20m. Even if the foreign matter enters between the power supply terminals 26 and 27 and accumulates, the space length of each other is long, so that a short circuit due to the accumulation of foreign matter such as wear powder is difficult to occur.

  Incidentally, a fitting hole 30j is provided in the central rib 30h, and a fitting protrusion 20u is provided on the bottom surface of the mounting recess 20m. The fitting hole 30j is located at an intermediate portion between the locking claws 30a and 30b provided at the radially inner end and the radially outer end of the mounting member 30, respectively. By fitting the fitting hole 30j and the fitting protrusion 20u to each other (see FIGS. 1 and 4), the attachment of the attachment member 30 to the attachment recess 20m is stabilized.

Next, characteristic effects of the present embodiment will be described.
(1) The power supply terminals 26 and 27 are disposed along both side walls of the mounting recess 20m provided in the end bracket 20, and the mounting member 30 is interposed between the power supply terminals 26 and 27 in the mounting recess 20m. . The facing surfaces of the mounting member 30 and the mounting recess 20m are configured with a labyrinth structure in which ribs 30g, 30h, 30i and convex portions 20p, 20q alternately enter between the power feeding terminals 26, 27. . Therefore, foreign matter such as wear powder of the power supply brushes 22 and 23 can hardly enter between the power supply terminals 26 and 27, and even if foreign matter such as wear powder enters between the power supply terminals 26 and 27 and accumulates, Since the structure has a long space length, it is difficult to cause a short circuit.

  (2) The motor 10 according to the present embodiment in which the mounting member 30 is disposed at the radial position of the commutator 17 is configured so that the axial direction of the motor 10 is substantially horizontal when mounted on the load device, and is mounted below the commutator 17. 30 will be located. In other words, in the motor 10 of the present embodiment, there is a situation in which foreign matter such as wear powder of the power supply brushes 22 and 23 falls around the mounting member 30. Therefore, it is significant that a structure in which foreign matter such as abrasion powder of the power supply brushes 22 and 23 does not easily enter between the power supply terminals 26 and 27 and a structure in which short circuit does not easily occur even if foreign matter such as abrasion powder enters and accumulates. .

  (3) Since power can be deposited on the dish-like portion 30c provided at the portion of the mounting member 30 facing the commutator 17 (radially inner end), such as wear powder of the power supply brushes 22 and 23. Intrusion of foreign matter such as wear powder between the terminals 26 and 27 can be suppressed.

  (4) By forming the dish-shaped portion 30c to have a shape in which the surrounding inclined portion 30e is higher than the central flat portion 30d, foreign matter such as wear powder of the power feeding brushes 22 and 23 does not easily fall, and foreign matter such as wear powder does not fall. Since it becomes easy to accumulate, the penetration | invasion of foreign materials, such as abrasion powder, between the terminals 26 and 27 for electric power feeding can be suppressed more.

In addition, you may change the said embodiment as follows.
-Regarding the shape of the dish-shaped part 30c of the mounting member 30, the peripheral part of the two opposing sides of the rectangular shape is the inclined part 30e higher than the central flat part 30d, but as shown in FIGS. 6 and 7, for example, the inclined part 30e An inclined portion 30k higher than the central flat portion 30d may also be provided in the peripheral portions of the two opposite sides orthogonal to each other, and the periphery of the central flat portion 30d may be annularly raised by the inclined portions 30e and 30k. In this way, foreign matter such as wear powder of the power supply brushes 22 and 23 is more difficult to fall, and foreign matter such as wear powder is more likely to accumulate. The shape of the dish-shaped portion 30c is not limited to this, and may be changed as appropriate. Moreover, although it is preferable to provide the dish-shaped part 30c, it can also be omitted.

Other functions may be mounted on the mounting member 30. For example, the mounting member 30 may be provided with a rotation detection sensor for acquiring rotation information of the rotating shaft 14 (armature 13).
Although the thermistor 28 is mounted, a choke coil or a capacitor for preventing noise may be mounted. Moreover, the structure which abbreviate | omitted one or all of these electric components may be sufficient.

  -You may apply the motor 10 to the motor of uses other than the power seat apparatus of a vehicle.

  DESCRIPTION OF SYMBOLS 13 ... Armature, 17 ... Commutator, 20 ... End bracket (housing member), 20m ... Mounting recessed part (concave part), 20p, 20q ... Convex part (convex part), 22, 23 ... Brush for electric power feeding, 26, 27 ... Power supply terminal, 30 ... Mounting member, 30c ... Dish-like part, 30d ... Central flat part (center part), 30e, 30k ... Inclined part (peripheral part), 30g, 30h, 30i ... Rib (convex part) .

Claims (4)

Power is supplied to an armature rotatably accommodated in a housing member through a power supply brush that can be slidably contacted with an outer peripheral surface of a commutator provided in the armature. A motor configured to perform power feeding through a pair of power feeding terminals arranged in the housing member,
The pair of power supply terminals are respectively disposed along both side walls of the concave portion provided in the housing member, and provided with a mounting member interposed between the pair of power supply terminals in the concave portion,
The opposing surfaces of the mounting member and the concave portion are configured to have a labyrinth structure in which convex portions alternately enter between the pair of power supply terminals. The motor according to claim 1,
The motor, wherein the mounting member is disposed at a radial position of the commutator. The motor according to claim 1 or 2,
The motor according to claim 1, wherein a portion of the mounting member facing the commutator is provided with a dish-like portion on which foreign matter such as wear powder of the power feeding brush can be accumulated. The motor according to claim 3, wherein
The said plate-shaped part is comprised so that a surrounding part may become higher than a center part, The motor characterized by the above-mentioned.