JP2542861B2 - Brush fixing method for rotational position detector - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotational position detecting device, and more particularly to a method for fixing a brush (slider) attached to the rotational position detecting device in various actuators.

[Prior Art] Conventionally, when a plurality of brushes (sliders) are arranged on, for example, the movable side of a rotational position detector, individually manufactured brushes are fixed to a flat portion of an output gear by heat staking or the like. are doing. This will be described with reference to FIGS. 3 to 7.

The rotational position detecting device S is composed of a gear 30 and a brush 40 as shown in FIGS. 3C and 3D, for example. Gear 30
Is formed integrally with a columnar body 32 that serves as an output shaft via a boss portion 31 and a disc body 33 that fixes the brush 40, and irregularities are engraved on the outer periphery of the disc body 33 to form a concavo-convex surface 33a. A predetermined number of holes 34 for press-fitting a support member 41, which will be described later, are formed at predetermined positions of the disc body 33, and the holes 34 have stepped portions.
34a is formed. Then, on the upper surface of the disc body 33 of the gear 30, brushes 40 (40a, 40a, 40a, 40a
Attach and fix b).

This mounting method will be described by taking the case of the brush 40a having a predetermined shape shown in FIG. 4 as an example.
A support member 41 as shown in FIG. 6 is attached to
The support member 40a is press-fitted and fixed in the hole 34 formed at a predetermined position of the disc body 33. Brush 40a shown in FIG. 4 above
The support member 41 attached to the brush is, as shown in FIG.
It is arranged in a flat portion 42 and a bent portion 43 of 40a. The shape of the support member 41 includes a press-fitting portion 41a press-fitted into the hole 34 and a claw portion 41b. The claw portion 41b engages with the stepped portion 34a of the hole 34 to prevent it from coming off.

[Problems to be Solved by the Invention] However, when the brush of the rotational position detecting device is configured by the method of the above-mentioned conventional technique, the manufacturing precision of each brush and the placement position of each brush are accurately adjusted so as not to shift. In order to achieve this, the respective precisions such as the precision of the position and the size of the holes drilled in the disc body as the base body are required.

Further, since the brushes are individually manufactured and assembled and fixed to the flat portion of the disk body of the gear as the base, when the heat staking is used, the dimensional error of the convex portion formed on the support member for the heat staking, the brush The dimensional error and the like of the individual products are added and accumulated, and they appear as an angular error between the brushes, which leads to a decrease in the detection accuracy of the rotational position detection device.

Further, since the individual brushes are assembled and fixed to the disc body as a base, there is a problem that the number of manufacturing steps is increased.

An object of the present invention is to enable a plurality of brushes to be integrally fixed at a predetermined position at a time, and to ensure the accuracy of manufacturing, assembling, and fixing of individual brushes, and at the same time prevent deformation of the brush contact portion. Therefore, it is another object of the present invention to provide a brush fixing method for a rotational position detecting device in various actuators that can maintain a good contact state.

[Means for Solving Problems] The present invention has been made to solve the above problems, and a brush fixing method according to the present invention includes a plurality of brushes each having a contact portion and a fixing portion. In a rotational position detecting device in which a plurality of brushes are electrically separated from each other and fixed to a base, the plurality of brushes are integrally formed as a brush substrate by connecting the fixing portions with narrow portions. A brush substrate is fixed to the base by fixing the fixing portion of each brush to a predetermined position of the base, and then the narrow portion is cut to divide the brush substrate into the plurality of brushes. Characterize.

Further, it is preferable that holes are formed in the base body at positions corresponding to the arrangement of the narrow portions of the brush substrate.

Further, the base body has a convex portion corresponding to the predetermined location, and the brush substrate is formed with a hole for fitting with the convex portion. After the convex portion and the hole are fitted, the convex portion is formed. The brush substrate may be fixed to the base by caulking.

Further, it is preferable that the base body is formed of a disk body having an uneven outer peripheral surface, or the base body is integrally molded of synthetic resin.

[Operation] According to the method of the present invention configured as described above, it is possible to attach a plurality of brushes as a brush substrate at one time, and the positional relationship between the brushes can be achieved without considering the precision of brush production and assembly individually. Can be ensured to be constant.

Further, when the brush substrate fixed to the base is divided into the electrically separated brushes, the narrow portion connecting the fixing portions is cut, so that the contact portion that is the sliding portion of each brush is No deformation etc. will occur.

Further, since the brush substrate is fixed by fixing the fixing portion of each brush to a predetermined position of the base, fixing the brush substrate to the base also fixes each brush to the base after separation. Has an effect.

Embodiment An embodiment of the method of the present invention will be described below with reference to the drawings. However, the members, materials, arrangements and the like described below are examples of the present invention, and can be variously modified without departing from the spirit of the present invention.

FIGS. 1A to 1F show an embodiment of the method of the present invention. In this example, as shown in FIG. 1A, there are four brushes, and the arrangement angle intervals of the brush contact portions are 120 ° or the like. They are arranged at intervals. However, the number of contact portions may be three, or four or more as long as there are two or more contact portions, and the angular intervals may be variously selected, not equal intervals, for convenience of design.

The rotational position detecting device S of this example has a movable body as a base on the movable side.
The gear 1 shown in FIGS. 1A and 1B is used, and the brush 2 (2a to 2d) is attached to the gear 1.

As shown in FIGS. 1C and 1D, the gear 1 as the base body of this example has a column body 120 serving as an output shaft via a boss portion 110 and a disk body 130 for fixing the brush 2 and a synthetic resin. The disc body 13 is formed by integral molding of (a thermoplastic resin in this example).
The outer periphery of 0 is an uneven surface 131 in which unevenness is engraved.
The uneven surface 131 meshes with a gear, a worm, or the like (not shown) to rotate the disc body 130, and the brush 2 comes into sliding contact with the stator side (not shown).

Holes 140 (141 to 149) are drilled at predetermined locations of the disc body 130, and convex portions 150 are further formed at predetermined locations.

The number of holes 140 and the number of holes to be drilled are the same as the number of cutting and separating positions of the brush substrate 200, which will be described later. In this example, since the brush 2 is formed at four places, the brush substrate 200 is separated and cut at the narrow portion 3, so that the holes 140 are denoted by reference numerals 141 to 143 and 144 to 146.
The holes shown by reference numerals 147 to 149 are punched at predetermined positions, and the holes shown by reference numerals 142 and 149 are largely punched corresponding to cutting positions of the brush substrate 200 described later.

The protrusions 150 are formed in the same number and position as the protrusions 150 are formed so as to fit with holes 250 formed in the brush substrate 200 described later. In this example, ten places are formed, and a slight gap is formed when the protrusion 150 and the hole 250 are intentionally fitted.

As shown in FIGS. 1E and 1F, the brush substrate 200 of this example is a metal plate made of a conductive metal material having elasticity such as a spring material, and a mounting hole 201 is formed in the center by pressing. The contact portions are formed as a single piece while forming a predetermined number of contact portions. That is, when forming the brush substrate 200 by pressing, the mounting hole 201, the contact portion 210,
It is formed by punching out the periphery of 211, 212, 213. Therefore, in this example, the contact portions 210 and 211, 212, 213 are respectively formed at equal angular intervals of 120 °, and as shown in FIG. 1F, the contact portions 210, 211, 212, 213 have a fixed portion at the base thereof. 220, 221, 222, 223 are formed continuously, and the contact portions 210, 211, 212, 213 have a jumped shape. In this example, holes 250 are formed in the fixed portions 220, 221, 222, 223 for fitting the projections 150 of the disc body 130 in the fixed portions 220, 221, 222, 223 when the brush substrate 200 is pressed.

Since the holes and bosses of the brush substrate, which are formed in advance as described above, and the protrusions 150 and the holes 250 are fitted and fixed, it is possible to accurately attach and fix the brushes so that the arrangement positions of the brushes do not shift. it can.

Further, each contact part 210, 211, 212, 213 and this contact part 210, 21
In this example, notches 261, 262, 263 are also formed at the time of punching by a press, which is convenient for cutting and separating each of the fixed parts 220, 221, 222, 223 continuous to 1,212, 213.
In this example, each notch portion 261, 262, 263 causes each brush 2a,
2b, 2c and 2d are formed with a narrowed portion 3 (shown by hatching in FIG. 1A).

Next, the gear 1 and the brush substrate 200 configured as described above are attached, and the brush 2 (2a, 2b, 2c, 2) is attached to the rotational position detecting device S.
The method of forming and fixing d) will be described.

To attach the gear 1 and the brush substrate 200, the boss portion 110 formed in the center of the gear 1 is positioned and the brush substrate 2 is attached.
The mounting hole 201 of 00 is fitted, and at the same time, the hole 250 of the brush substrate 200 is fitted to the convex portion 150 formed on the gear 1. Since the boss portion 110 and the mounting hole 201 of the brush substrate 200 are both at the center of each member as in the present example, the accuracy in forming and fixing can be improved. Then, the convex portion 150 of the gear 1 is caulked by heat and fixed by welding by ultrasonic caulking or the like. At this time, in the fixing method of this example, when the brush substrate 200 is divided, the brush substrate 200 is fixed at two or more positions in each of the fixing portions continuous with the contact portions so as to prevent backlash and prevent rotation. . By fixing in this way, the convex portion 15 of the gear 1
0 and the gap intentionally provided in the hole 250 of the brush substrate 200 are filled with the melted resin, and the brush substrate 200
Is securely fixed.

After fixing the brush substrate 200 to the gear 1, the brush substrate 200 is fixed to the contact portions 210, 211, 212, 213 and the fixing portions 220, 221, 222,
Each brush 2 (2a, 2b, 2c, 2d) consisting of 223 is divided.
The division is performed by laser cutting the narrow portion 3 of the brush substrate 200 (shown by the slanted lines in FIG. 1A) to insulate each brush 2.
(2a, 2b, 2c, 2d). The narrow portion 3 of this example is a disc body 130.
Brush substrate 20 arranged on each of the holes 141 to 149 formed in
Since it is a part of 0 and each hole 141 to 149 is formed,
Utilizing this, chips at the time of cutting can be removed, and deformation of the resin due to laser cutting or the like can be prevented. Further, since the brush is divided by the narrow portion on the fixed portion side, the sliding portion of the brush is not deformed and good brush contact can be obtained.

Incidentally, in the brush fixing method of the rotational position detecting device in the above embodiment, the fitting of the projection 150 of the disc body 130 and the hole 250 of the brush substrate 200 was used for positioning, but the positioning is not limited to this, and the boss portion is not limited thereto. It can be modified by using various means such as forming a projection or a recess on 110 and forming a recessed cutout or a protrusion on the brush substrate 200 so as to be aligned therewith.

FIG. 2 shows a second embodiment, and in this embodiment, a brush is attached to a fixed side base as a base body. In this example, the same material as in the above example,
The same members and the like are designated by the same reference numerals and the description thereof will be omitted.

In this example, as shown in FIG. 2A, the base 4 as the base and the connector 5 are made of resin, and the connection terminal 5a of the connector 5 and the base of the brush 6 (6a, 6b, 6c, 6d) are formed. 7 (fixed portion) is connected and formed.
As shown in FIG. 2B, the brush substrate 600 of this example has a contact portion 61.
Four brushes 6a, 6b, 6c, each with 0,611,612,613,
It is divided into 6d, and each brush 6 in the narrow part 3
The a, 6b, 6c and 6d are integrally connected. Also, the base 4 has six holes 440 (441 to 446),
The hole 440 (441 to 446) is formed at a position where the narrow portion 3 is arranged when the brush substrate 600 is fixed. The procedure for forming and fixing the brush on the base having the above-described structure is the same as in the above-described embodiment.

[Effects of the Invention] As described above, according to the present invention, in a rotational position detecting device for various actuators, a plurality of brushes can be integrally fixed at a predetermined position at a time, and individual brushes can be manufactured and assembled. In addition, there is an excellent effect that each fixing accuracy can be secured, the contact portion of the brush can be prevented from being deformed, and a good contact state can be maintained.

[Brief description of drawings]

FIG. 1 shows a rotational position detecting device according to the method of the present invention.
1A is a plan view, FIG. 1B is a partially cutaway side view, FIG. 1C is a plan view of a gear before brush assembly, FIG. 1D is a cross-sectional view taken along the line II of FIG. 1C, and FIG. 1E is FIG. 1F is a side view of FIG. 1E, FIG. 2 shows a second embodiment, and FIG.
2A is a plan view of the rotational position detecting device, FIG. 2B is a plan view of the brush substrate, and FIGS. 3 to 7 show conventional examples.
3A is a plan view, FIG. 3B is a partially cutaway side view, FIG. 3C is a plan view of a gear before brush assembly, and FIG. 3D is a III-III of FIG. 3C.
4 is a plan view of the brush, and FIGS. 6 and 7 are side views of the brush shown in FIGS. 4 and 5. 1,4 …… Base (gear, base), 2 (2a, 2b, 2c, 2d), 6 (6a, 6b, 6c, 6d) …… Brush, 3 …… Narrow part, 110 …… Boss part, 140 (141〜149), 440 (441,442,443,444,445,446) ……
Hole, 150 ... Protrusion, 200,600 ... Brush substrate, 210,211,212,213,610,611,612,613 ... Contact part, 220,221,222,223,7 ... Fixed part 250 ... Hole, 261,262,263 ... Notch part, S ... Rotary position detector.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sadahiro Shimamura 390 Umeda, Kosai City, Shizuoka Asmo Co., Ltd. (56) References JP 57-202075 (JP, A)

Claims (5)

(57) [Claims] 1. A rotary position detecting device comprising a plurality of brushes each having a contact portion and a fixing portion, wherein the plurality of brushes are fixed to a base in a state of being electrically separated from each other. The plurality of brushes are integrally formed as a brush substrate by connecting the fixing portions with a narrow portion, and the brush substrate is fixed to the base body by fixing the fixing portion of each brush to a predetermined position of the base body. After that, the narrow portion is cut and the brush substrate is divided into the plurality of brushes. 2. The brush fixing method for a rotational position detecting device according to claim 1, wherein the base has a hole formed at a position corresponding to the arrangement of the narrow portion of the brush substrate. 3. The base has a convex portion corresponding to the predetermined location, and a hole for fitting the convex portion is formed in the brush substrate, and after the convex portion and the hole are fitted. The brush fixing method for a rotational position detecting device according to claim 1 or 2, wherein the convex portion is caulked and the brush substrate is fixed to the base body. 4. The brush fixing method for a rotational position detecting device according to claim 1, wherein the base body is formed of a disc body having an uneven outer peripheral surface. . 5. The brush fixing method for a rotational position detecting device according to claim 1, wherein the base is integrally molded of synthetic resin.