JP2019062694A - motor - Google Patents

Abstract

To provide a motor capable of stably holding a choke coil while facilitating assembly.SOLUTION: A holder member 22 housed in a holder housing unit 8d includes a holding wall 32 and a holding piece 33 which face each other. A choke coil 26 is housed between the holding wall 32 and the holding piece 33. The holder housing unit 8d includes a pressing unit 42 which presses the holding piece 33 to displace the holding piece 33 toward the holding wall 32.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a motor.

  Heretofore, as a motor, for example, a brush holder device held across a motor main body for rotationally driving a rotary shaft, a reduction portion for reducing rotation of the rotary shaft, a housing of the motor main body and a gear housing of the reduction portion And U.S. Pat. And a brush holder apparatus hold | maintains the brush for electric power feeding, a choke coil, etc. by the holder member made of resin.

JP, 2015-91159, A

  In the motor as described above, it is desirable to suppress rattling of the choke coil assembled to the holder member as much as possible in order to suppress disconnection or the like of the terminal wire of the choke coil. Therefore, for example, a configuration is conceivable in which the holder member includes a wall surface and a pressing piece that has flexibility so that the distance to the wall surface changes. That is, by setting the distance between the pressure piece not receiving external force (not flexed) and the wall surface to be smaller than the outer diameter of the choke coil and elastically holding the choke coil between the wall surface and the pressure piece It becomes possible to suppress and hold back the coil.

  However, in such a choke coil holding structure, since the distance between the pressing piece and the wall surface is set smaller than the outer diameter of the choke coil, assembly of the choke coil between the pressing piece and the wall surface is not easy. There is a possibility that it will be a bad effect in realizing the automation of motor assembly.

  The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a motor which can stably hold a choke coil while facilitating assembly thereof.

  A motor for solving the above problems includes a motor case, an armature housed in the motor case and provided with a winding, a choke coil provided in a feeding path to the winding, and a holder accommodating portion of the motor case And a holder member for holding the choke coil, wherein the holder member includes a first holding portion and a second holding portion facing each other, and the first and second holding portions The choke coil is accommodated in between, and the holder housing portion includes a pressing portion that presses the second holding portion to displace the second holding portion toward the first holding portion.

  According to this configuration, the second holding portion of the holder member is not in engagement with the pressing portion of the holder housing portion before the holder member is stored in the holder housing portion, and the second holding portion is the first holding portion. Not displaced to the side. Therefore, the choke coil can be easily assembled between the first holding portion and the second holding portion. Then, in a state where the holder member is accommodated in the holder accommodating portion, the second holding portion is pressed by the pressing portion of the holder accommodating portion and displaced to the first holding portion side, thereby the first holding portion and the second holding portion The distance to the department narrows. For this reason, the stable holding which suppressed the rattling of the choke coil accommodated between the 1st holding part and the 2nd holding part is attained.

In the motor, the first holding portion and the second holding portion sandwich the choke coil in a contact state.
According to this configuration, since the choke coil is held between the first holding unit and the second holding unit that receives the pressing force from the pressing unit, rattling of the choke coil can be further suppressed, and the choke coil Stable holding is possible.

In the motor, the second holding portion includes a stress relief portion for reducing a force transmitted from the pressing portion to the choke coil via the second holding portion.
According to this configuration, even if a dimensional error or the like occurs, the first and second holding portions can be configured so as not to have excessive force holding the choke coil, and as a result, damage to the choke coil is suppressed. it can.

  In the above-mentioned motor, the stress relief portion has a curved shape so as to expand toward the first holding portion side or the opposite side in a state before the holder member is accommodated in the holder accommodating portion.

According to this configuration, the force transmitted from the pressing portion to the choke coil via the second holding portion can be suitably relieved by the stress relief portion.
In the motor, the second holding portion is displaced to the first holding portion side on the side opposite to the surface of the second holding portion opposite to the surface facing the first holding portion by engagement with the holder housing portion. A taper portion is provided for the purpose.

  According to this configuration, when the holder member is housed in the holder housing portion, the pressing portion of the holder housing portion engages with the tapered portion of the second holding portion, whereby the second holding portion is suitable for the first holding portion side. Can be displaced.

  According to the motor of the present invention, stable holding can be achieved while facilitating assembly of the choke coil.

The side view of the motor in an embodiment. The partially expanded schematic diagram of the brush holder apparatus in the form. The schematic diagram for demonstrating the assembly aspect of the choke coil in the form. The partially expanded schematic diagram of the brush holder apparatus in a modification.

Hereinafter, an embodiment of the motor will be described.
As shown in FIG. 1, the motor 1 of the present embodiment includes a motor main body 4 that rotationally drives the rotation shaft 3 of the rotor 2 (armature), and a speed reduction unit 5 that reduces the rotation of the rotation shaft 3 There is.

  The yoke housing 6 of the motor main body 4 is made of a conductive metal material and formed in a bottomed cylindrical shape, and a permanent magnet 7 is fixed to the inner peripheral surface thereof. A flange 6 a is formed at the opening of the yoke housing 6, and the flange 6 a is fixed by a fixing portion 8 a of the gear housing 8 of the reduction gear 5 and a bolt 9. The yoke housing 6 and the gear housing 8 constitute a motor case of the motor 1.

  The rotor 2 includes a rotor core 2a fixed to the rotation shaft 3 so as to be integrally rotatable, and a winding 2b wound around the rotor core 2a. Rotor core 2 a and winding 2 b are accommodated radially inside permanent magnet 7 in yoke housing 6. Further, the rotor 2 is provided with a commutator 2c fixed to the rotor 2 so as to be integrally rotatable and to which the winding 2b is connected.

  The gear housing 8 of the speed reducing portion 5 is made of a synthetic resin material, and the fixing portion 8a fixed to the yoke housing 6; a worm accommodating portion 8b extending in the axial direction of the rotating shaft 3 from the fixing portion 8a; It has the wheel accommodating part 8c formed in the side (right side in FIG. 1) of the worm accommodating part 8b. The worm accommodating portion 8b accommodates the worm shaft 12 coupled with the tip of the rotary shaft 3 through the clutch 11, and the wheel accommodating portion 8c includes the worm wheel 13 engaged with the worm shaft 12. It is housed. An output shaft 14 is provided at an axial center of the worm wheel 13, and the output shaft 14 is drivingly connected to an external load.

The motor 1 further includes a brush holder device 21 held across the yoke housing 6 and the gear housing 8.
The brush holder device 21 is electrically connected between the power supply brush 24 in sliding contact with the commutator 2 c of the rotor 2 and the power supply brush 24 and the external connection terminal 25 in the resin holder member 22. The choke coil 26 is held. A part of the holder member 22 is accommodated in a holder accommodating portion 8 d formed in the gear housing 8.

Next, the holding structure of the choke coil 26 will be described.
As shown in FIG. 2, the holder member 22 includes a base 31, and a holding wall 32 and a holding piece 33 which respectively extend from the base 31 to the speed reducing portion 5 in the axial direction. Further, the holder member 22 is provided with a column portion 34 which extends from the base portion 31 to the side of the speed reducing portion 5 in the axial direction and is inserted into the choke coil 26. The pillar portion 34 is provided between the holding wall 32 and the holding piece 33. The base 31 is a portion held by the flange 6 a of the yoke housing 6 and the fixing portion 8 a of the gear housing 8. Moreover, the holding | maintenance wall 32 of this embodiment is a part of surrounding wall which covers the outer periphery of the commutator 2c.

  The holding wall 32 and the holding piece 33 are opposed in a direction parallel to the direction orthogonal to the axis. The choke coil 26 is accommodated between the holding wall 32 and the holding piece 33. The choke coil 26 is provided such that its central axis is parallel to the axial direction (vertical direction in FIG. 2) of the motor 1.

  In the gear housing 8, the wall portion 41 constituting the holder accommodating portion 8 d has a pressing portion 42 located outside the holding piece 33 of the holder member 22. The pressing portion 42 presses the holding piece 33 toward the holding wall 32 side. The holding piece 33 displaced toward the holding wall 32 by the pressing portion 42 holds the choke coil 26 in contact with the holding wall 32. The width dimension (dimension in the direction orthogonal to the sheet of FIG. 2) of the holding piece 33 is smaller than the diameter of the choke coil 26. Further, the side surfaces (surfaces sandwiching the choke coil 26) facing each other in the holding wall 32 and the holding piece 33 are arc surfaces centering on the central axis of the choke coil 26.

  Here, FIG. 3 partially shows the holder member 22 in a state before being accommodated in the holder accommodation portion 8d. That is, in the same figure, the state before the holding piece 33 of the holder member 22 is displaced by the press part 42 of the holder accommodating part 8d is shown. As shown in the figure, the distance between the holding wall 32 and the holding piece 33 is set wider than the diameter of the choke coil 26. As a result, the choke coil 26 can be easily accommodated between the holding wall 32 and the holding piece 33.

  A tapered surface 35 is formed on the inner surface (the side surface facing the holding wall 32) of the axial front end of the holding piece 33 so as to be inclined away from the holding wall 32 toward the axial front end. There is. When the choke coil 26 is assembled in the axial direction, the tapered surface 35 acts to guide the choke coil 26 between the holding wall 32 and the holding piece 33. It is easy to insert between.

  In addition, as shown in FIG. 3, the holding piece 33 has a stress relief portion 36 that curves so as to expand on the side away from the holding wall 32 at an intermediate portion in the longitudinal direction. An outer side surface (a surface opposite to the side facing the holding wall 32) of the stress relief portion 36 is a curved surface 37 as a tapered portion. Then, when the holder 22 is inserted into the holder housing 8 d, the wall 41 of the holder housing 8 d contacts the curved surface 37 to displace the holding piece 33 toward the holding wall 32. Thereby, as shown in FIG. 2, the distance between the holding piece 33 and the holding wall 32 is narrowed, and the choke coil 26 is held between the holding piece 33 and the holding wall 32. At this time, the stress relief portion 36 is plastically deformed so as to be pinched and crushed between the wall portion 41 of the holder housing portion 8 d and the choke coil 26. As a result, the force transmitted from the pressing portion 42 to the choke coil 26 via the holding piece 33 is alleviated.

Next, the operation of the motor 1 configured as described above will be described.
When power is supplied from the external power supply to the external connection terminal 25 of the motor 1, power is supplied to the winding 2b of the rotor 2 through the choke coil 26, the power supply brush 24 and the commutator 2c. It is rotationally driven. Then, the worm shaft 12 rotates integrally with the rotary shaft 3, and the worm wheel 13 and the output shaft 14 rotate as the worm shaft 12 rotates (decelerated), and power is transmitted from the output shaft 14 to the external load. It is transmitted. At this time, the electric noise generated by the sliding contact of the power supply brush 24 with the commutator 2 c is reduced by the choke coil 26.

Next, the effects of the present embodiment will be described.
(1) The holder accommodating portion 8 d of the gear housing 8 includes the pressing portion 42 which presses the holding piece 33 of the holder member 22 to displace the holding piece 33 toward the holding wall 32. According to this configuration, the holding piece 33 of the holder member 22 is not in engagement with the pressing portion 42 of the holder accommodating portion 8d before the holder member 22 is accommodated in the holder accommodating portion 8d. It is not displaced to the wall 32 side. Therefore, the choke coil 26 can be easily assembled between the holding wall 32 and the holding piece 33. Then, in the state where the holder member 22 is housed in the holder housing portion 8d, the holding piece 33 is pressed by the pressing portion 42 of the holder housing portion 8d and displaced to the holding wall 32 side, whereby the holding wall 32 and the holding piece The gap with 33 is narrowed. For this reason, the stable holding which suppressed the rattling of the choke coil 26 accommodated between the holding wall 32 and the holding piece 33 is attained.

  (2) The holding wall 32 and the holding piece 33 hold the choke coil 26 in a contact state. According to this configuration, since the choke coil 26 is held between the holding wall 32 and the holding piece 33 that receives the pressing force from the pressing portion 42, rattling of the choke coil 26 can be further suppressed, and the choke coil 26 can be further suppressed. More stable retention of Further, by holding by the holding wall 32 and the holding piece 33, the choke coil 26 can be stably held without using an adhesive.

  (3) The holding piece 33 includes the stress relief portion 36 for reducing the force transmitted from the pressing portion 42 to the choke coil 26 via the holding piece 33. According to this configuration, even if a dimensional error or the like occurs, the holding wall 32 and the holding piece 33 can be configured so as not to have an excessive force to hold the choke coil 26. As a result, the choke coil 26 is damaged Can be suppressed.

  (4) The stress relief portion 36 has a curved shape so as to expand on the side away from the holding wall 32 before the holder member 22 is accommodated in the holder accommodating portion 8 d. According to this configuration, the force transmitted from the pressing portion 42 to the choke coil 26 via the holding piece 33 can be suitably relieved by the stress relief portion 36.

  (5) The holding piece 33 is displaced to the holding wall 32 side on the outer surface of the holding piece 33 (the surface opposite to the surface facing the holding wall 32) by engagement with the wall portion 41 of the holder housing portion 8d. The curved surface 37 (taper part) for making it do is provided. According to this configuration, when the holder member 22 is housed in the holder housing portion 8d, the pressing portion 42 of the holder housing portion 8d engages with the curved surface 37 of the holding piece 33, whereby the holding piece 33 is on the holding wall 32 side. Can be suitably displaced.

The above embodiment may be modified as follows.
The configuration such as the shape of the holding piece 33 in the above embodiment is an example, and can be changed as appropriate. For example, it may be changed to the holding piece 51 as shown in FIG. The holding piece 51 has a tapered portion 52 on the outer surface (the surface on the opposite side to the side facing the holding wall 32) of the axial tip end portion. The tapered portion 52 is inclined so as to approach the choke coil 26 as the tip end of the holding piece 51 in the axial direction approaches. The tapered portion 52 functions in substantially the same manner as the curved surface 37 of the holding piece 33 of the above embodiment. That is, when the holder 22 is inserted into the holder housing 8 d, the wall 41 of the holder housing 8 d contacts the tapered portion 52, whereby the holding piece 51 is displaced toward the holding wall 32, and the holding piece 51 and the holding are held. The choke coil 26 is held by the wall 32.

  Moreover, in the structure shown in FIG. 4, the taper part 41a is formed also in the inner surface of the wall part 41 of the holder accommodating part 8d. The tapered portion 41a is inclined so as to approach the choke coil 26 side (the holding piece 51 side) as it goes away from the base 31 in the axial direction. The tapered portion 41 a of the holder housing portion 8 d also functions substantially the same as the tapered portion 52 of the holding piece 51. That is, when the holder member 22 is inserted into the holder housing portion 8d, the holding piece 51 is displaced to the holding wall 32 side by coming into contact with the taper portion 41a, and the choke coil 26 is held between the holding piece 51 and the holding wall 32. It has become so.

  In addition, although the taper part 52,41a is formed in each of the holding piece 51 and the holder accommodating part 8d in the structure shown in FIG. 4, not only this but one of the taper parts 52 and 41a is abbreviate | omitted. It is also good. Further, the tapered portion 41a may be applied to the holder accommodating portion 8d of the above embodiment.

In the above embodiment, the stress relief portion 36 of the holding piece 33 has a shape that bulges to the side away from the holding wall 32. However, the stress relief portion 36 may bulge to the holding wall 32 side.
In the above embodiment, the holding piece 33 is extended in the axial direction, but not limited to this, it may be extended in a direction parallel to the direction orthogonal to the axis.

  In the above embodiment, the choke coil 26 is provided so that its longitudinal direction is parallel to the axial direction of the motor 1, but the arrangement of the choke coil 26 is not limited to this. For example, the longitudinal direction of the choke coil 26 may be parallel to the axis orthogonal direction of the motor 1 or the longitudinal direction of the choke coil 26 may be inclined to the axial direction of the motor 1. By doing this, it is possible to reduce the axial size of the brush holder device 21 and the motor 1.

  In the above embodiment, the holding wall 32 as the first holding portion is a part of the peripheral wall covering the outer periphery of the commutator 2c, but not limited to this, the peripheral wall covering the outer periphery of the commutator 2c and the peripheral wall May be provided separately.

  In the above embodiment, the holding wall 32 and the holding piece 33 sandwich the choke coil 26 in a contact state, but the invention is not particularly limited thereto. That is, in the assembled state of the holder member 22 (that is, the state in which the holding piece 33 is pressed toward the holding wall 32 by the pressing portion 42), the distance between the holding piece 33 and the holding wall 32 is greater than the diameter of the choke coil 26. It may be configured to be wide. Even with such a configuration, rattling of the choke coil 26 can be suppressed by narrowing the distance between the holding piece 33 and the holding wall 32 by the pressing of the pressing portion 42.

  In the above embodiment, the holder housing portion 8d for housing the holder member 22 is provided in the gear housing 8. However, the present invention is not limited to this. The configuration in which the holder member 22 is housed in the yoke housing 6 (that is, the yoke housing 6 is It is good also as composition provided with a holder seat part. In this case, the pressing portion for displacing the holding piece (second holding portion) of the holder member to the holding wall (first holding portion) side is configured as a part of the yoke housing 6 on the inner peripheral surface of the yoke housing 6 or the like. Ru.

-Although applied to the holder member 22 with which the brush holder apparatus 21 is provided in the said embodiment, it is applicable to the holder member which hold | maintains a choke coil other than a brush holder apparatus.
-Although the said embodiment has shown the application example with respect to the motor 1 with a brush, it is applicable not only to this but other types of motors, such as a brushless motor.

  -The above-mentioned embodiment and each modification may be combined suitably.

  DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Rotor (armature), 2b ... Winding, 6 ... Yoke housing which comprises a motor case, 8 ... Gear housing which comprises a motor case, 8d ... Holder accommodating part, 22 ... Holder member, 26 ... choke coil, 32 ... holding wall (first holding part), 33 ... holding piece (second holding part), 36 ... stress relief part, 37 ... curved surface (taper part), 42 ... pressing part, 51 ... holding piece (2nd holding | maintenance part), 52 ... taper part.

Claims (5)

Motor case,
An armature housed in the motor case and provided with a winding,
A choke coil provided in a feed path to the winding;
And a holder member which is accommodated in the holder accommodating portion of the motor case and holds the choke coil,
The holder member includes a first holding portion and a second holding portion facing each other, and the choke coil is accommodated between the first and second holding portions.
The motor according to claim 1, wherein the holder accommodating portion includes a pressing portion configured to press the second holding portion to displace the second holding portion toward the first holding portion. In the motor according to claim 1,
A motor, wherein the first holding portion and the second holding portion sandwich the choke coil in a contact state. In the motor according to claim 2,
The motor according to claim 1, wherein the second holding unit includes a stress relief unit for reducing a force transmitted from the pressing unit to the choke coil via the second holding unit. In the motor according to claim 3,
The motor according to claim 1, wherein the stress relieving portion is curved so as to expand toward the first holding portion side or the opposite side in a state before the holder member is accommodated in the holder accommodating portion. In the motor according to any one of claims 1 to 4,
A taper for displacing the second holding portion toward the first holding portion by engagement with the holder accommodating portion on a side surface of the second holding portion opposite to the surface facing the first holding portion. A motor characterized in that a part is provided.