JPH0223096Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a brush holding device for a control motor that drives the operating section of a small mechanism such as a print motor whose rotor has a diameter of approximately 48 mm. .

[Prior art and problems]

In many devices of this type, the combination mechanism of the brush holder, brush terminal, brush cap, etc. has conventionally been a simple fitting mechanism of a protrusion (protrusion) and a hole (recess).

However, the warpage (bending) of the brush terminal
The brush holder,
Due to dimensional errors in the form of brush terminals, brush caps, etc., or due to design defects, there may be gaps between them, causing looseness in the combination, or when inserting the brush terminal into the brush holder or inserting the brush into the brush terminal. This made it impossible to fit the cap into place, and in some cases, the cap could be damaged if it was forced into place.

[Purpose of invention]

Here, the present invention can handle even brush terminals with warpage (bentness) and uneven solder filling.
It is an object of the present invention to provide a brush holding device which securely fixes the brushes by sandwiching them between a brush holder and a brush cap.

[Summary of the invention] The present invention provides a substantially rectangular and flat board part, and a part that is slightly smaller than the board and is parallel to the long longitudinal direction of the board part and overlaps the center part of the board vertically. A brush comprising a raised part having a central raised part with a convex cross-section in the direction, and a groove formed between the substrate part and the raised part in parallel to the edge on the shorter lateral edge of the raised part. A groove-shaped concave portion for guiding the cap is created, and an elliptical convex portion for the brush cap stopper, which is a roughly elliptical protrusion that gradually becomes higher toward the center, is created at the center of the central convex portion of the protrusion. In the flat parts provided on both sides of the central convex part, holes through which the brush can be inserted are formed downward, extending from the raised part to the brush holder body, and the brush is pushed downward into the hole. It has a brush insertion hole with a round hole through which a spring can be inserted, and a brush terminal holding protrusion that is provided on both sides of the raised part to prevent the brush terminal from coming off further laterally from both sides. The brush holder body, which has a convex part, is formed from a thermoplastic resin mold, and a solderable band-shaped metal plate is inserted into the brush insertion hole at both ends, which are part of the horizontal length of the raised part of the brush holder body. Bend it in the direction of the ridge and fit it on the vertical side of the raised part, pass the pigtail with the brush fixed to one end through the hole from the top of the brush insertion hole, and solder the other end of the pigtail with the spring inserted to the band-shaped metal plate. A brush terminal is formed by making a bulge of solder on the surface of the band-shaped metal plate on the opposite side of the brush, and surrounds the raised part of the brush holder body from above and both sides, and the inner height is almost the same as that of the raised part. The inside lengths of both lateral sides are approximately equal to the length in the vertical direction of the protrusion, and the lower part of the inside of both lateral sides has a brush cap convex portion that engages with the brush cap guide groove-like recess of the brush holder body. It is provided with a convex cap stopper that comes into contact with a part of the protrusion near the side surface on both sides at the rear opposite to the direction of insertion along the groove-like recess for guiding the brush cap, and on the upper surface in the upward direction. Near the center, a brush cap with a hole for a brush cap stopper into which an elliptical protrusion for a brush cap stopper can fit is formed by thermoplastic resin molding, and each brush is soldered to two brush terminals. 24 are inserted through the insertion holes from the top of the brush insertion holes provided on both sides of the raised part of the brush holder main body, and the flat part of each brush terminal is inserted between the side surface of the raised part and the brush terminal holding convex part. Insert the bent side surfaces of both ends of the brush terminal into the vertical side surfaces of the raised portion, and insert the brush terminal along the brush cap guiding groove-like recess of the brush holder body from the open front of the brush cap. This brush holding device is constructed by inserting the brush cap while bending its upper surface upward until the cap stopper comes into contact with the protrusion of the brush holder body, thereby restoring the upward bending of the upper surface.

〔Example〕

FIG. 1 shows a perspective view of the entire assembly in one embodiment of the present invention.

10 is a brush holder molded with a thermosetting resin mold and holds a brush; 20 is a brush terminal made of a conductor to which the brush is electrically connected to an external power source; 30 is a brush terminal 20 formed with a thermosetting resin mold. This is a brush cap that fixes the brush to the brush holder 10.

FIG. 2 is an exploded perspective view of each member of FIG. 1.

Reference numeral 11 indicates a guide groove-like recess of the brush cap 30 provided on the side surface of the protrusion between the main body of the brush holder 10 and the protrusion in the center thereof, and reference numeral 12 indicates a brush terminal holding protrusion provided on both sides of the protrusion. ,1
3 is an elliptical convex portion for a stopper of the brush cap 30 provided at the central convex portion of the raised portion, and 14 is a brush insertion hole formed from the raised portion of the brush holder 10 to the main body.

21 is a solder bulge for pigtail connection on the brush terminal 20, 22 is a spring that presses the brush, 23 is a pigtail that connects the brush and the brush terminal 21, and 24 is a brush that contacts the rotor.

31 is a convex portion of the brush cap 30 that engages with the guide groove-like concave portion 11; 32 is a convex portion of the elliptical convex portion 13;
The circular hole 33 for the stopper of the brush cap 30 into which the brush cap 30 is fitted engages with the groove-shaped recess 11 for guiding the brush cap, and the brush cap 30 is slid along the groove-shaped recess 11 at the rear opposite to the direction in which the brush cap 30 is slid onto the brush terminal 20. These are convex cap stoppers that form a stopper by coming into contact with a part of a protrusion near both side sides, and between both cap stoppers there is a connection to a power source (not shown) from two brush terminals 20. It is a space that does not interfere with the environment.

As shown in FIGS. 1 and 2, the brush holding mechanism of the present invention includes a brush terminal 20 set in the upper part of the brush insertion hole 14 of the brush holder main body 10, and a brush cap protrusion 31 of the brush cap 30 held in the brush terminal 20. Guide groove-like recess 1 of holder body 10
1, the brush terminal 20 is securely fixed while being slid in the direction of the arrow in FIG. That is, two brush terminals 2
The brushes 24 soldered to the brush terminals 20 are inserted through the insertion holes 14 from above the brush insertion holes 14 provided on both sides of the raised portion of the brush holder main body 10, and the flat portions of each brush terminal 20 are inserted into the brush insertion holes 14 provided on both sides of the raised portion of the brush holder body 10. The brush terminal 20 is inserted between the side surface of the brush terminal 20 and the brush terminal holding protrusion 12, and the side surfaces of the bent portion at both ends of the brush terminal 20 are fitted and inserted into both longitudinal side surfaces of the raised portion, and the open front side of the brush terminal 20 is From there, the brush cap 30 is inserted along the brush cap guide groove-like recess 11 of the brush holder body 10 while bending its upper surface upward until the cap stopper 33 comes into contact with the raised part of the brush holder body 10. This is a brush holding device in which the upward deflection of the surface is restored.

In this case, as shown in FIG.
The movement in the ○A direction is suppressed, and the movement is only in the ○B direction.

Next, in order to suppress this movement in the ◯ and ◯ directions, the brush cap protrusion 31 of the brush cap 30 is inserted into the brush cap guide groove-like recess 11 as shown in FIG.
Slide it along.

At this time, since the brush cap stopper elliptical protrusion 13 is protruding, the brush cap 30 bulges in the direction of ○ as shown in FIG. go.

Then, when the brush cap stopper hole 32 comes to the brush cap stopper elliptical protrusion as shown in FIG. 5, the brush cap 30 tries to return to its original shape, but the solder swells
1 part hits the inside part of the brush cap 30, suppresses the movement in the direction of ○, and the brush terminal 20
This is to securely fix the

However, at this time, the brush cap stopper hole 32 and the brush cap stopper elliptical convex portion 13 are tightly fitted.

[Effect of idea]

Thus, according to the present invention, the overall size of the brush holding device of the present invention in a small motor for controlling such operating equipment can prevent current cut-off and brush pigtail breakage, which are causes of motor failure. The size is about the size of the head of a thumb, so it is possible to prevent insufficient spring pressure or disconnection of the motor current circuit due to malfunctions around the spring, etc., by completely fitting and connecting the brush holder body, brush terminal, and brush cap. In addition to solving the problem all at once, insert the brush into the brush insertion hole of the brush holder body, fit the brush terminal between the raised part and the convex part for holding the brush terminal, and push it in, so that the brush cap is engaged with the guide groove-like unevenness. Productivity can be improved through a simple combination mechanism in which the cap stopper, the hole for the brush cap stopper, and the elliptical protrusion for the brush cap stopper are molded in one touch.

[Brief explanation of drawings]

Fig. 1 is a perspective view of one embodiment of the present invention, Fig. 2 is an exploded perspective view of each component, Figs.
5 and 5 are explanatory views of the combination. DESCRIPTION OF SYMBOLS 10...Brush holder body, 11...Brush cap guide groove-shaped recess, 12...Brush terminal holding protrusion, 13...Oval shaped protrusion for brush cap stopper, 20...Brush terminal,
21...Solder rise, 22...Pigtail, 23...Spring, 24...Brush, 3
0... Brush cap, 31... Brush cap convex portion, 32... Brush cap stopper hole,
33... Cap stopper.

Claims (1)

[Scope of Claim for Utility Model Registration] A substantially rectangular and flat board part is provided on the board part, parallel to the long longitudinal direction of the board part, and overlapped with the central part of the board slightly smaller than the board part in the longitudinal direction. A brush cap is provided with a raised part having a central convex part having a convex cross-section, and a brush cap having a concave groove formed between the base part and the raised part parallel to the edge on the shorter lateral edge of the raised part. A guiding groove-like recess 11 is created, and an elliptical convex part 13 for a brush cap stopper, which is a roughly elliptical protrusion that gradually becomes higher toward the center, is created in the center of the central convex part of the raised part. A hole through which the brush 24 can be inserted downward is formed in each of the flat parts provided on both sides of the central convex part, and the brush 24 is inserted through the hole from the raised part to the brush holder main body 10.
The brush terminal 2 has a brush insertion hole 14 which is also open with a round hole into which a spring 23 that presses the brush terminal 2 downward can be inserted.
The brush holder main body 10 is made of a thermoplastic resin mold, and has brush terminal holding protrusions 12 which are protrusions that prevent the brush terminal from separating further laterally from both sides. Both ends forming a part of the lateral length of the protrusion of the main body 10 are bent in the direction of the brush insertion hole 14 and fitted into the vertical sides of the protrusion, and the brush is inserted from the top of the brush insertion hole 14 to one end. 2
Pigtail 2 into which the spring 23 is inserted through the hole through which the pigtail 21 to which 4 is fixed is inserted.
A brush terminal 20 is formed by soldering the other end of 1 to a band-shaped metal plate and creating a solder bulge 21 on the surface of the band-shaped metal plate opposite to the brush 24. The inside height is approximately equal to the raised part, the inside length of both sides is approximately equal to the vertical length of the raised part, and the lower part of the inside of both sides is provided with a brush holder. A brush cap convex portion 31 that engages with the brush cap guide groove-like recess 11 of the main body 10 is formed, and a protrusion near the rear and both lateral sides of the brush cap on the opposite side of the insertion direction along the brush cap guide groove-like recess 11 is formed. A part of the brush cap stopper is provided with a convex cap stopper 33 that comes into contact with the brush cap stopper, and a brush cap stopper hole 32 into which the brush cap stopper elliptical convex part 13 can be fitted is opened near the center of the upper surface of the brush cap stopper. The brush cap 30 is formed of a thermoplastic resin mold, and the brushes 24 each soldered to two brush terminals 20 are inserted into the insertion hole from the upper part of the brush insertion hole 14 provided on both sides of the raised part of the brush holder main body 10. 14, the flat part of each brush terminal 20 is inserted between the side surface of the raised part and the brush terminal holding convex part 12, and both ends of the brush terminal 20 are inserted into both longitudinal sides of the raised part. The side surfaces of the bent portions are fitted and inserted, and the brush cap 30 is moved from the open front of the brush cap 30 along the brush cap guide groove-like recess 11 of the brush holder main body 10 while bending its upper surface upward. A brush holding device characterized in that the cap stopper 33 is inserted until it comes into contact with the raised part of the brush holder main body 10, and the upward deflection of the upper surface is restored.