JPH0237262Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a commutator motor such as one used in an electric mixer, and particularly to a capacitor mounting structure for noise prevention.

[Conventional technology]

The structure of the conventional commutator motor, especially regarding the mounting part of the noise prevention capacitor, is explained in the fourth and fifth sections.
This will be explained using figures. In FIG. 4, the first frame 1 is integrally formed with a protrusion 8 extending outward from the vicinity of the flange 7, and the capacitor 3 is mounted on the side of the protrusion 8 with an elastic restraining plate 9 in between. The capacitor 3 is mounted and held down by a protrusion 11 that extends from the vicinity of the flange 10 of the second frame 2 and is integrally formed, and the first frame 1 and the second frame 2 are connected to the screw 12. By being assembled in this way, the protrusions 8 and 11 are sandwiched and fixed with the restraining plate 9 interposed therebetween. FIG. 5 is a detailed view of the capacitor mounting portion of FIG. 4. In the figure, the protrusion 8 of the first frame 1 is provided with a recess 13 for mounting the restraining plate 9, and the side wall 14 of this recess 13 is designed to easily guide the capacitor 3 during assembly work. It is formed in an R shape. Further, a capacitor support part 15 is formed on the outside of the side wall 14 and extends from the side wall in an L-shape. It also serves as The restraining plate 9 connects the first frame 1 and the second frame.
When the first frame 2 is assembled, the capacitor 3 has an appropriate strength of elasticity to press and fix the capacitor 3 to the protrusion 11 of the first frame 1.

Next, the capacitor mounting and fixing function will be explained.

If the protruding portion 8 of the first frame 1 and the capacitor 3 are configured with a slight gap, the capacitor 3
is fixed in contact with only the protrusion 11 of the second frame 2 and the holding plate 9, and the elasticity of the holding plate 9 holds down the capacitor 3 with appropriate strength, and the outer shell of the capacitor 3 It can be securely fixed without deforming or damaging it. Also, since the ground terminal 6 of the capacitor 3 connected internally is in contact with the second metal frame 2, it has the same potential as the first and second frames 1 and 2 and can be grounded. However, if the restraining plate 9 is made of a conductive metal material such as a phosphor bronze plate, grounding can be established more reliably.

[Problem that the invention attempts to solve]

Since the conventional capacitor mounting structure for noise prevention in a commutator motor is as described above, an elastic holding plate 9 is required to ground the ground terminal of the capacitor, which increases the number of parts.
Furthermore, since the first and second frames are formed with protrusions 8 and 11 extending outward from the flange portions, there is a problem in that the external shape of the motor becomes large.

This idea was devised in view of the above-mentioned problems, and the purpose is to reduce the number of parts required for capacitor installation, and to obtain a compact commutator motor that is inexpensive, easy to assemble, and easy to assemble.

[Means for solving problems]

The commutator motor according to this invention is characterized in that the bearing holding plate is provided with an elastic arm formed by extending a part thereof, and a noise prevention capacitor is held in the frame near the bearing using this elastic arm. It is something to do.

[Effect]

The bearing retaining plate is closely fixed to the frame by caulking pins, etc. A part of this bearing retaining plate is extended to form an elastic arm, and this elastic arm is used to sandwich the capacitor in the frame near the bearing. The capacitor can be grounded by supporting the capacitor by pressing the elastic arm against the grounding terminal which also serves as the capacitor jacket.

〔Example〕

This invention will be described in detail below with reference to the illustrated embodiments.

As shown in FIG. 1, the first frame 21 and the second frame 22 both support a bearing 40 and are fastened together at the flange 7 with a screw 12. Bearing 4 supported by second frame 22
0, a bearing retainer plate 41 made of an elastic material is caulked and fixed to the second frame 22 by a caulking boss 42, and this bearing retainer plate 41 has an elastic arm portion extending outward. It has 43. This elastic arm portion 43 serves to hold the noise prevention capacitor 33. 44 is a brush holder, 45 is a brush holder insulator that electrically insulates the brush holder from the frame, 47 is a square hole drilled on the brush holder insulating plate, and the hole width is smaller than the outer diameter of the capacitor 23; The length of is larger than the length of the capacitor. 46 is a frame 2 for fixing the brush holder insulating plate 45 to the second frame 22;
This is a caulking boss integrally formed from two parts.

Next, the function of attaching and fixing the noise prevention capacitor 23 will be explained with reference to FIG.

First, the bearing presser plate 41 is fixed to the second frame 22 by caulking so as to hold the bearing 40 therein.
Then, the capacitor 23 is dropped into the square hole 47 of the brush holder insulating plate 45, and in this state, the capacitor 23 is inserted into the second frame 22 so that the capacitor ground terminal 26 comes into pressure contact with the elastic arm 43 extending from the bearing retainer plate 41.
The brush holder insulating plate 45 is caulked and held. In this way, the capacitor 23 is connected to the bearing holding plate 4.
The extended elastic arm portion 43 of 1 holds the ground terminal 26 at an appropriate strength, and electrically the ground terminal 26 becomes at the same potential as the frame 22 through the bearing holding plate 41, so that it can be grounded.

In the above embodiment, the capacitor 23 is
However, instead of the brush holder insulating plate 45, a protrusion 22a for suppressing the noise prevention capacitor 23 is integrally formed on the frame as shown in FIG. A similar effect can be obtained by sandwiching a capacitor between them.

[Effect of idea]

As described above, according to the invention, the capacitor is sandwiched between a part of the elastic arm part of the bearing holding plate and the protruding part of the brush holder insulating plate or frame, which reduces the need for parts and improves workability. This has the effect of making commutator motors cheaper, as well as improving
Since the capacitor holding portion does not protrude outside the outer diameter of the frame, there is an effect that the outer size of the motor can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the commutator motor according to this invention, Fig. 2 is an exploded partial perspective view of the capacitor installation part of the motor shown in Fig. 1, seen from below, and Fig. 3 is another embodiment. 4 is a sectional view showing an example of a conventional commutator motor, and FIG. 5 is an exploded partial perspective view of a capacitor mounting portion of the motor shown in FIG. 4. In the figure, 21 is a first frame, 22 is a second frame, 23 is a noise prevention capacitor, 4
0 is a bearing, 41 is a bearing holding plate, 43 is an elastic arm,
44 is a brush holder, and 45 is a brush holder insulating plate. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A bearing that receives the rotating shaft of a commutator motor, a frame that supports this bearing, a bearing holding plate that is fixed to this frame and fixes the bearing, and a brush holder; In a commutator motor equipped with a brush holder insulating plate that electrically insulates the brush holder from the frame and a noise prevention capacitor, the noise prevention capacitor is attached to the frame using an elastic arm that is an extension of the bearing holding plate. A commutator motor is characterized in that the commutator motor is sandwiched near the above-mentioned bearing within the motor. (2) The commutator motor according to claim 1, which is a utility model registration, characterized in that a noise prevention capacitor is sandwiched between an elastic arm and a part of an insulating plate of a brush holder. (3) The commutator motor according to claim 1 of the utility model registration claim, characterized in that a noise prevention capacitor is held between an elastic arm and a part of the frame.