JPS5928033B2 - Kogatadendouki no Satsushitanshihojisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a temporary structure in which a brush piece 2 that contacts a commutator 1 and a terminal plate 3 bent at a substantially right angle to the brush piece 2 are integrally formed. A reinforcing rib 5 for reinforcing the terminal plate 3 is provided between the temporary fixing cut and raised piece 4 and the cut and raised piece for preventing removal 6, which also forms a cut and raised piece 6 for fixing the position of the fixing cut and raised piece 4. Both sides of the terminal insertion hole 8 provided in the synthetic resin bearing stand T are recessed outward in a dogleg shape continuously in the longitudinal direction, and both sides of the terminal plate 3 to be fitted into the terminal insertion hole 8 are provided. The ends of the terminal insertion hole 8 are brought into engagement with the dogleg-shaped concave surfaces 9, 9 on both side walls of the terminal insertion hole 8, and the cut-out and raised pieces 6 are engaged with the locking steps 10 of the terminal insertion hole 8, and the temporary locking notches 6 are engaged with the locking steps 10 of the terminal insertion hole 8. The raised piece 4 is temporarily fixed by coming into elastic contact with the inner wall of the terminal insertion hole 8, and the part 22 of the bearing stand T around the temporary fixed cut piece 4 is thermally melted to form the temporary fixed cut piece 4 with the molten resin. This relates to a brush terminal holding device for a small electric motor, which is characterized by being fixed by welding, and its purpose is to facilitate assembly, increase stability after assembly, and securely fix brush terminals. An object of the present invention is to provide a brush terminal holding device for a small electric motor.

FIG. T and FIG. 8 show an example of a conventional brush terminal holding device, in which a bent portion 11 having spring properties is formed on the side of a base 2a bent at right angles of the brush piece 2, and A small positioning hole 12 and a cut-out piece 13 are formed in the inverted L-shaped terminal plate 3 formed separately, and the base 2a of the brush piece 2 and the terminal plate 3 are fitted into the groove 14 of the bearing stand 7. , the dowel 15 is inserted into the small hole 12 of the terminal plate 3, and the curved part 11 is brought into elastic contact with the terminal plate 3, and the cut and raised piece 13 of the terminal plate 3 is brought into elastic contact with the wall surface of the groove part 14, and the bearing base T is The brush piece 2 and the terminal plate 3 were fixed.

However, such a conventional example has a large number of parts, which increases the cost of materials and manufacturing, which is disadvantageous in terms of cost.It is also difficult to position the brush piece 2 and the terminal plate 3 when attaching them, resulting in poor productivity. It was hot. Also, Figures 9 to 10
The figure shows another conventional example in which a brush piece 2 and a terminal plate 3 are integrally formed. formed into;
The base 2a is elastically supported and engaged with the three support columns 16, 17, and 18 protruding from the bearing stand 7 so as to form an arc, and is engaged with a dowel 19 protruding from the upper surface of the central support column 17. A tension element 20 having several pieces of elastic claws is fitted into the inner peripheral surface, and the base part 2a of the brush piece 2 is fixed by the tension element 20 to prevent it from coming off. However, even in this conventional example, in addition to the need to use the tensioner 20 separately, the base 2a of the brush piece 2
Since it is necessary to elastically support the tensioner 20 in an arc shape, it is difficult to attach and has the disadvantage of poor production quality.Also, since the tensioner 20 is formed separately, the number of parts increases, which is disadvantageous in terms of material and manufacturing costs. A problem arose. Also, Figure 11,
2 and 13 show still another conventional example, in which the terminal plate 3 is simply inserted into the parallel through-hole 29 and locked with the cut-and-raised piece 30, so that the terminal plate 3 is sufficiently fixed. However, it is easy for misalignment to occur.

Furthermore, since the cut and raised pieces 30 are simply cut and raised on the terminal plate 3, the rigidity of the terminal plate 3 is reduced and the springiness of the brush piece 2 is deteriorated. The present invention has been provided in view of the above points, and one embodiment of the present invention will be described in detail below with reference to the drawings.

Reference numeral 2 denotes a brush piece formed of a metal piece having spring properties.The tip of the brush piece 2 is in sliding contact with the commutator 1, and the rear end is bent at a right angle into a substantially L-shape to form a terminal plate 3. A terminal hole 21 for attaching a lead wire is provided at the tip of the terminal plate 3.

Reference numeral 6 denotes a cut-and-raised piece for positional adjustment and removal prevention formed by cutting and bending a part of the terminal plate 3, 5 is a reinforcing rib formed by planing one side of the terminal plate 3, and 4 is a cut-out piece for temporary fixing. It is an original piece.

The reinforcing rib 5 is provided between the cut and raised piece 4 for temporary fixing and the cut and raised piece 6 for preventing coming off, protruding in the same direction as the cut and raised pieces of the cut and raised piece 4 for temporary fixing and the cut and raised piece 5 for preventing coming off. The terminal plate 3 thus formed is inserted and fixed into a terminal insertion hole 8 provided in a synthetic resin bearing stand 7 of a small electric motor. Here, the terminal insertion hole 8 provided in the bearing stand 7
has both side walls outwardly recessed in a dogleg shape, and these doglegged concave surfaces 9, 9 are formed continuously in the longitudinal direction of the terminal insertion hole 8, and further near the outer opening of the terminal insertion hole 8. Step 10
A welding rib 22 is formed protruding near the inner opening. Therefore, when inserting and fixing the terminal plate 3 into the terminal insertion hole 8 provided in the bearing stand 7, the terminal insertion hole 8
Both ends of the terminal plate 3 are brought into engagement engagement with the doglegged concave surfaces 9, 9, and the retaining cut-and-raised piece 6 is engaged with the locking step portion 10 from the outside O, and the temporary-fastening cut-and-raised piece 4 comes into contact with the inner wall surface of the terminal insertion hole 8 and is temporarily fixed.

Thereafter, the welding rib 22 is thermally melted, and this molten resin flows into the temporary fixing cut and raised piece 4, so that the locking cut and raised piece 4 is welded and fixed to the bearing stand 7. In this way, the position in the Y direction shown in the drawing is determined by the double cut 5 raised pieces 4 and 6 for temporary fixing and removal prevention, and it is also prevented from coming off in the Z direction. The position in the X direction and the Y direction is adjusted by the engagement and abutment relationship with the doglegged concave surfaces 9, 9. Further, the temporary fixing cut-out O piece 4 of the terminal plate 3 is welded and fixed to the bearing stand 7, so that the terminal plate 3 is firmly fixed in the terminal insertion hole 8. In the figure, 23 is a shaft, 24 is a small bearing stand, 25 is a bearing, 2
6 is a case, 27 is a magnet, and 28 is a rotor core block. Since the present invention is configured as described above, it is possible to accurately and easily position the terminal board and insert and fix the terminal board into the terminal insertion hole by using a single component. The mounting position of the terminal board is automatically and accurately regulated by the engagement relationship between the shaped concave surface and both ends of the terminal plate, and the engagement relationship between the cut-out piece for preventing removal and the locking step O. Since a part of the bearing base around the raised piece is thermally melted and the temporary fixing cut piece is welded and fixed using the molten resin, the terminal plate can be more securely attached to the bearing base. be.

Further, in the present invention, a cut-and-raised piece for preventing removal is formed on the terminal board, and the cut-and-raised piece for preventing coming-out is engaged with the locking step of the terminal insertion hole, so that the terminal board is surely engaged and removed. There is no danger whatsoever. Moreover, since the reinforcing ribs are provided on the terminal board between the cut-and-raised pieces for temporary fixing and the cut-and-raised pieces for temporary fixing, and the angle is θ, not only can the terminal board itself be reinforced, but also the reinforcing rib can be used to connect the pair of cut-and-raised pieces for temporary fixing. It is also possible to reinforce the strength of the protruding portion between the piece and the retaining cut-and-raised piece. Therefore, the terminal plate at the protruding portion of the pair of temporary fixing cut and raised pieces and the retaining cut and raised piece is prevented from bending or twisting, and the brush piece can always be attached to the bearing base with a constant elastic contact force. In addition to being able to support the brush piece, the spring constant of the so-called elastic body of the brush piece can be kept low and always constant, the contact pressure of the brush piece in contact with the commutator can be maintained constant, and chattering can be prevented, providing a high-quality motor. It is possible.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of one embodiment of the present invention;
The figure is an enlarged perspective view of the integrally formed brush piece and terminal plate same as above, FIG. 3 is an enlarged sectional view of the same terminal plate installed in the terminal insertion hole, and FIG. 4 is an enlarged sectional view taken along line A-A of same as above. , FIG. 5 is an enlarged sectional view taken along line B-B of the same as above, FIG. 6 is a rear view of the bearing stand with the brush attached to the same as above, FIG. 7 is an enlarged exploded perspective view of the brush mounting part of the conventional example, and FIG. 8 is 9 is an enlarged exploded perspective view of the brush mounting part of another conventional example, and FIG. 10 is a rear view of the bearing holder with a brush installed in the conventional example. , FIG. 11 is a partially omitted plan view of another conventional example, FIG. 12 is a partially omitted side view of the same conventional example, and FIG. 13 is a perspective view of the brush of the same conventional example.
1 is a commutator, 2 is a brush piece, 3 is a terminal plate, 4 is a temporary fixing cut piece, 5 is a reinforcing rib, 6 is a cut piece for preventing removal, 7 is a bearing stand,
8 is a terminal insertion hole, 9 is a dogleg-shaped concave surface, and 10 is a locking step.

Claims (1)

[Claims] 1. A brush piece that contacts the commutator and a terminal plate bent at a substantially right angle to the brush piece are integrally formed, and a cut-and-raised piece for temporary fixing and a cut-and-raised piece for preventing removal that also serves as position adjustment is attached to the terminal plate. At the same time, a reinforcing rib for reinforcing the terminal board is provided between the temporary fixing cut-and-raised piece and the removal-preventing cut-and-raised piece that also serves as position regulation, and both sides of the terminal insertion hole provided in the synthetic resin bearing stand are provided. The wall is recessed outward in a dogleg shape continuously in the longitudinal direction, and both ends of a terminal plate to be fitted into the terminal insertion hole are brought into engagement engagement with the doglegged concave surfaces of both side walls of the terminal insertion hole, The cut-and-raised piece for retaining is engaged with the locking step part of the terminal insertion hole, and the cut-and-raised piece for temporary fixing is brought into elastic contact with the inner wall of the terminal insertion hole to be temporarily fixed. A brush holding device for a small electric motor, characterized in that a part of the brush is melted by heat, and a temporary fixing piece is welded and fixed using the molten resin.