JPS6141405Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a commutator motor in which the number of parts is reduced and assembly is simplified by supporting the bearing retainer plate, which presses and supports the bearing that functions as the shaft bearing, on the motor case using a brush support base.

The commutator motor of this invention will be explained together with the embodiment shown in the drawings.
In FIG. 2 showing the A' cross section, the bowl-shaped first and second case parts 1 and 2 are assembled by abutting the flange parts integrally formed on the respective opening edges and tightening them with screws 3. One motor case 4 is formed. The first case portion 1 has a stator 5 press-fitted therein secured to the peripheral wall, and an oilless bearing 6 secured to the central region of the bottom wall. In addition, the shaft 7 whose one end edge is rotatably supported by the oilless bearing 6 is
Iron core 8, winding 9 wound around it, and commutator 1
The other end edge of the shaft 7 is rotatably supported by a bearing 12 provided in the central region of the bottom wall of the second case portion 2.

First brush sleeve 1 housing brush 13
4 and a similar second brush sleeve 15
is fixed to a brush support stand 16, and the brush support stand 16 includes a base plate portion 18 having an escape hole 17 in the central region and a base plate portion 18 as shown in FIG.
consists of first and second boss portions 19, 20 that stand up integrally from both end edges of the
It is fixed to the bottom wall portion of the second case portion 2 by screws 23 and 24 passing through central holes 21 and 22 of the boss portions 19 and 20, respectively.

The first and second boss portions 19 and 20 are each formed with a convex cross section, and a step portion in the middle portion of each of the boss portions 19 and 20 forms a bearing holding plate 2 made of a steel plate.
I support 5. As shown in FIG. 4, the bearing holding plate 25 has an escape hole 26 in the center region and engagement holes 27 and 28 on both end edges, and the engagement holes 27 and 28 have first and second holes. The small diameter portions 29 and 30 of the boss portions 19 and 20 are loosely fitted into each other. Therefore, the bearing holding plate 25
is placed on the large diameter portions 31 and 32 of the first and second boss portions 19 and 20, and the peripheral edge 33 of the relief hole 26 connects the outer ring portion of the bearing 12 to the second case portion. Press it toward the bottom wall of No.2. Therefore, the bearing 12 is attached to the bearing holding plate 2.
5 and the bottom wall portion of the second case portion 2, and this clamping prevents movement in the thrust direction.

a guide protrusion 34 formed by bending both ends of the bearing holding plate 25 at approximately right angles;
35 is a small hole 3 in the bottom wall of the second case part 2
6 and 37, the bearing holding plate 25 will not be misaligned.

Reference numerals 38 and 39 indicate retaining rings for preventing the shaft 7 from being press-fitted into the bearing 12.

In assembling such a motor, the shaft 7 of the rotor 11 is press-fitted into the bearing 12, and then the shaft 7 is inserted into the relief hole 17 of the brush support stand 16 and the relief hole 26 of the bearing holding plate 25. However, since the inner diameter of the bearing retainer plate 25 at the escape hole circumferential edge 33 is smaller than the outer diameter of the bearing 12, it is necessary to slightly incline the bearing retainer plate 25 with respect to the bearing 12 during the insertion process. Next, brush support stand 1
6 and the bearing retainer plate 25 are fitted together as described above, and then this assembly is housed in the second case part 2, and the brush support 16 is attached to the second case part 2 by screws 23 and 24. Fixed to. Next, the first case part 1 with the stator 5 attached thereto is butted against the second case part 2 and tightened with screws 3 to integrate them.

In addition, as another assembly method, the bearing 12,
Bearing holding plate 25 and brush support stand 16
is attached to the bottom wall of the second case portion 2 in advance, and then the shaft 7 of the rotor 11 can be press-fitted into the bearing 12 and the retaining ring 39.

As described above, the commutator motor of this invention includes a bearing holding plate that presses and supports a bearing provided on the bottom wall of the motor case toward the bottom wall, and a pair of brushes that support the bearing. and a brush support, wherein the brush support is fixed to the bottom wall by first and second boss portions having a convex cross section provided at both ends thereof,
By supporting the bearing holding plate at the stepped portion in the midsection of each of the first and second boss portions, this structure is compared to the conventional structure in which the bearing holding plate and the brush support are separately fixed to the motor case. This has the advantage that the number of fixing members such as screws or rivets can be reduced and the assembly work can be simplified.

In addition, by providing guide protrusions on both ends of the bearing holding plate, positioning of the bearing holding plate is facilitated when the bearing holding plate is assembled into the motor case, and even after completion, the bearing holding plate does not shift out of position. It can be operated stably.

[Brief explanation of the drawing]

The drawings show one embodiment of the commutator motor of this invention, FIG. 1 is a plan view, and FIG.
A' sectional view, FIG. 3 is a plan view of the brush support, and FIG. 4 is a plan view of the bearing press plate. 1, 2...Case part, 11...Rotor, 12
...Bearing, 16...Brush support stand, 19,
20...Boss part of the support base, 25...Bearing holding plate.

Claims (1)

[Claims for Utility Model Registration] A bearing holding plate that presses and supports a bearing provided on the bottom wall of a motor case toward the bottom wall; a brush support that supports a pair of brushes; In order to attach the brush support to the bottom wall, first and second boss portions having a convex cross section are provided at both ends of the brush support, and a stepped portion is provided in the middle of each boss portion. an engagement hole provided in the bearing holding plate so as to engage with each other; and guide protrusions provided at both ends of the bearing holding plate and fitting into small holes provided in the bottom wall, A commutator motor in which the bearing press plate is fixed by attaching the brush support to the bottom wall.