JPH034143Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention is a cylindrical yoke equipped with a stator, and a pair of brackets integrally connected with bolts are fitted to both ends of the housing. For a rotating electric machine, a commutator is provided at the end of a rotating shaft having a rotor and rotatably supported by the housing, and an insulating substrate is fixed to the housing to support a brush that slides into contact with the commutator. Related to brush support structure.

(2) Conventional technology Conventionally, in such rotating electric machines, the claws of the brush holder made of press-formed metal plates are fitted into the insulating substrate and then bent and fixed, the eyelet terminals are caulked and fixed, and the insulation is further fixed. It is connected by eyelets to a metal support plate for fixing the board to the housing.

(3) Problems to be solved by the invention The conventional structure described above requires a step of attaching the brush holder to the insulating substrate during assembly, a step of caulking the eyelet terminal to fix it to the insulating substrate, and a step of overlapping the insulating substrate and support plate. Many steps, such as the step of joining with eyelets, are necessary, and the manufacturing cost, including the cost of manufacturing molds for the brush holder and support plate, tends to be high.
Further, the work of fixing and soldering the lead wires to the eyelet terminals is complicated, and this also requires a lot of man-hours. Furthermore, the shape of the support plate is necessarily complicated in order to avoid contact with the eyelets and eyelet terminals.

The present invention was developed in view of the above circumstances, and aims to provide a brush support structure for rotating electric machines that reduces assembly man-hours, reduces the number of parts, and simplifies the shape, thereby reducing costs. purpose.

B. Structure of the invention (1) Means for solving the problems According to the invention, one end of the yoke has a plurality of fitting protrusions that fit into the open end of the yoke, and a ring plate is made of an insulating material. A support plate formed in the shape of a ring is fixed between one of the brackets and the yoke, and an insulating substrate formed in the shape of a ring plate corresponding to the support plate is fixed to the support plate by a fixing member. The insulating substrate has a "co" which is open facing the inner peripheral edge and closed on one side by the support plate.
A notch in the shape of a letter is provided, and a fitting hole protrudes from the side edge of the notch to the side opposite to the support plate and cooperates with the support plate to fit and hold the brush from the inner peripheral side of the insulating substrate. A rectangular box-shaped brush holder with a substantially U-shaped cross section is integrally provided to define the shape of the brush. An opening for taking out the lead wire is provided in the insulating substrate at a portion corresponding to the opening, and an "L"-shaped enlarged notch is formed by enlarging the notch to correspond to the thickness of the side wall of the brush holding part. A notch is provided, and a protrusion that fits into the enlarged notch and is flush with the inner surface of the brush holding part is provided to protrude from the support plate.

(2) Effect Since the insulating substrate and the support plate are connected by a relatively small number of fixing members, and the brush holding portion is integrally provided with the insulating substrate, it is possible to reduce the number of parts. Moreover, since the support plate is also formed of an insulating material, it is not necessary to have a complicated structure to avoid contact with the fixing member. Furthermore, since an opening for taking out the lead wire is provided on the side wall of the brush holder, it is possible to wire the lead wire without protruding beyond the height of the brush holder, and the rotating electric machine can be moved in the axial direction. This makes it possible to make it more compact. Further, the insulating substrate is provided with an enlarged notch in a portion corresponding to the opening, the notch being enlarged to correspond to the thickness of the side wall of the brush holder. Despite this, the insulating substrate has no portions that overlap with each other in the axial direction, and the insulating substrate can be molded by simply using a two-split mold. Moreover, by fitting the protrusion of the support plate into the enlarged notch, the engagement protrusion can be brought into contact with the side surface of the brush in the fitting hole, and the brush holding part cooperates with the protrusion. The brush is stably supported and the brush is prevented from tilting within the fitting hole.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 4 and 5 are fitted together, and the brackets 4 and 5 are tightened with bolts 6 in the direction toward each other.

A pair of pole cores 7 are fixed to the inner surface of the yoke 3 at opposing positions along one diameter line, and a stator 9 is constructed by winding a coil 8 around the pole cores 7.

A rotor 10 is disposed inside the stator 9 . The rotor 10 is mounted on a rotating shaft 13 that is rotatably supported by bearings 11 and 12 in first and second brackets 4 and 5 of the housing 2, and has an iron core 14 fixed to the rotating shaft 13. and,
A coil 16 is wound around an iron core 14 via a bobbin 15. Further, in the rotating shaft 13, a commutator 18 is attached to the end on the one bracket 4 side.
is fixed.

Referring also to FIG. 2, the commutator 1
A pair of brushes 19 that are in sliding contact with the insulating substrate 20
The insulating substrate 20 is held by a pair of brush holding parts 21 that are integrally provided with the yoke 3 , and the insulating substrate 20 is coupled to a support plate 22 fixed to one end of the yoke 3 . Furthermore, a breaker holder 23 provided integrally with the insulating substrate 20 holds an overcurrent prevention breaker 24 .

In FIGS. 3 and 4, the insulating substrate 20 is formed into a ring plate shape from an insulating material such as a synthetic resin, and has a through hole 25 in the center through which the commutator 18 is inserted. This insulating substrate 20 is provided with a pair of "U"-shaped notches 26, 26 on one diameter line thereof. These notches 26,
26 is open facing the inner peripheral edge of the insulating substrate 20, and one side thereof can be closed by the support plate 22.

Further, the insulating substrate 20 has the notches 26, 2.
Brush holding parts 21 and 2 protrude from the side edge of 6 to the other side, that is, the side opposite to the side closed by the support plate 22.
1 is integrally provided. These brush holding parts 21, 21 are formed in a rectangular box shape with a substantially U-shaped cross section, and when the insulating substrate 20 and the support plate 22 are combined, each brush holding part 21, 21 and the support plate 22 cooperate with each other to define fitting holes 27, 27 each having a rectangular cross section and opening toward the inner side of the insulating substrate 20.

The brushes 19, 19 are fitted into the respective fitting holes 27, 27 from the inner peripheral side of the insulating substrate 20, but there is a spring between the closed end of each fitting hole 27, 27 and each brush 19, 19. 28 (see Fig. 1) are respectively interposed, and each brush 19, 19 is connected to the commutator 1.
The brush holding portion 2 is in elastic sliding contact with the brush holding portion 8.
1,21.

On one side along the circumferential direction of the insulating substrate 20, an opening 29 for taking out a lead wire (not shown) is provided in the side wall of each brush holding part 21, 21, and a wire corresponding to the opening 29 is provided. The sides of the notches 26, 26 are enlarged by the thickness of the side walls of the brush holding parts 21, 21. As a result, "L"-shaped enlarged notches 30 are formed in the insulating substrate 20 by enlarging the sides of the notches 26, 26 by an amount corresponding to the thickness of the side walls of the brush holding parts 21, 21, respectively. .

Three eyelets 31, 32, 33 are bored in the insulating substrate 20 between the two brush holders 21, 21, and three eyelets 31, 32, 33 are bored in the insulating substrate 20 on the other side between the two brush holders 21, 21. 34, an engagement hole 35, and a rectangular hole 36 are drilled, respectively. The rectangular hole 36 is formed to extend substantially in the radial direction of the insulating substrate 20, and the engagement hole 35 is formed in a rectangular shape that extends in a direction parallel to the longitudinal direction of the rectangular hole 36.

A substantially U-shaped breaker holding portion 23 protrudes from both longitudinal edges of the rectangular hole 36 toward the side opposite to the support plate 22.
is integrally provided on the insulating substrate 20.

In FIG. 5, the cross-sectional shape of the breaker 24 is rectangular enough to be inserted into the breaker holding part 23, and a locking protrusion 37 that can be engaged in the engagement hole 35 is provided near the rear end. It is provided all around the circumference. Furthermore, a substantially U-shaped leaf spring 38 is fitted into the upper part of the breaker holding part 23, and the breaker 24 is inserted into the breaker holding part 23 by engaging the locking protrusion 37 in the engagement hole 35. , is elastically held by the breaker holding part 23 by the spring force of the leaf spring 38.

This insulating substrate 20 is molded, for example, by a mold with a top and bottom split, and includes a pair of brush holding parts 21, 2.
There is a notch 2 in the insulating substrate 20 at the part corresponding to 1.
6 and 26 are formed, and the brush holding part 2
Enlarged notch 3 corresponding to opening 29 of 1 and 21
0 are formed in series with the notches 26, 26, respectively, and a rectangular hole 36 is formed in a portion corresponding to the breaker holding portion 23. Therefore, the insulating substrate 2
0 has no mutually overlapping portions in the axial direction, and can be molded using a conventionally well-known upper and lower split type molding die.

6 and 7, the support plate 22 is formed of an insulating material such as synthetic resin into a ring plate shape, and its outer diameter is set to be slightly larger than the inner diameter of the yoke 3. As shown in FIGS. Moreover, a through hole 3 corresponding to the through hole 25 of the insulating substrate 20 is provided in the center of the support plate 22.
9 is drilled.

This support plate 22 has four eyelets 4 at positions corresponding to the four eyelets 31 to 34 of the insulating substrate 20.
1 to 44 are drilled. These eyelet holes 41-44
are aligned with the eyelet holes 31 to 34 with the insulating substrate 20 and the support plate 22 in contact with each other, and the eyelet hole 31
~34, eyelet 40 as a fixing member in 41~44
are inserted respectively. By caulking the ends of these eyelets 40, the insulating substrate 20 is attached to the support plate 22.
Fixed.

On one side of the support plate 22 facing the insulating substrate 20 side,
Protrusions 45, 45 are integrally provided so as to be flush with the inner surface of the brush holding part 21 and fit into the enlarged notches 30 of the insulating substrate 20, respectively. Also,
A plurality of, for example, four, fitting protrusions 46 and a single positioning protrusion 47 are integrally provided on the other surface of the support plate 22 . Each fitting protrusion 46 and positioning protrusion 47 are configured so that they can be fitted into one end of the yoke 3.
It is disposed slightly inward from the outer surface of the support plate 22. Furthermore, in correspondence with the positioning protrusion 47, a positioning fitting part (not shown) into which the positioning protrusion 47 can be fitted is provided on the inner surface of the yoke 3.

On the other hand, small diameter cylindrical parts 48 and 49 having an outer diameter corresponding to the outer diameter of the support plate 22 are coaxially provided at both ends of the yoke 3, and both brackets 4,
Large diameter holes 50 and 51 that fit into the small diameter cylindrical parts 48 and 49 are provided at the opening edges of 5, respectively.

Referring again to FIG. 1, the first bracket 4 includes:
A connection 52 is provided for drawing the input cord into the housing 2.

Next, to explain the operation of this embodiment, when supporting the brushes 19, 19, the protrusions 45,
45 are fitted into the enlarged notches 30, 30, respectively, and the insulating substrate 20 and the support plate 22 are brought into contact with each other. In this state, the eyelets 31 to 34 of the insulating substrate 20
and the eyelets 41 to 44 of the support plate 22 are located at corresponding positions, respectively. Therefore, the eyelet 40 is connected to the insulating substrate 2.
The insulating substrate 20 and the support plate 22 are inserted into the eyelets 31 to 34 and 41 to 44 from the 0 side and caulked at the tips of the eyelets 40 protruding from the support plate 22.
are substantially integrated.

Next, the support plate 22 integrated with the insulating substrate 20
is fitted into one end of the yoke 3. That is, the positioning protrusions 47 are used for positioning, each fitting protrusion 46 is fitted to one end of the yoke 3, and the support plate 22 is brought into contact with the end surface of the small diameter cylindrical part 48. At this time, the connection end of the coil 8 in the stator 9 is inserted into one of the eyelets 40, and with the support plate 22 fitted to one end of the yoke 3, the brushes 19, 1
9. Connect the breaker 24, coil 8, etc. by soldering. Therefore, a connecting terminal such as an eyelet terminal, which was conventionally required, becomes unnecessary.

Thereafter, the first and second brackets 4 and 5 are fitted to both ends of the yoke 3, and both brackets 4 and 5 are integrated with bolts 6. At this time, the support plate 22 is attached to the small diameter cylindrical portion 48 at one end of the yoke and the step of the large diameter hole 50 in the first bracket 4,
is fixed to the housing 2.

In such a structure, the insulating substrate 20 has brush holding parts 21, 21 and a breaker holding part 23.
are integrated, and there is no need to attach separate parts as in the past, reducing the number of parts. Further, since the support plate 22 is made of an insulating material, the eyelet 40
It does not require a complicated shape to avoid contact with the object and is simplified. Further, the breaker 24 is elastically and reliably held in the breaker holding part 23 by an extremely simple operation of just inserting the breaker 24 into the breaker holding part 23. Moreover, the insulating substrate 20 has
An enlarged notch 30 is provided by enlarging the sides of the notch 26 so as not to overlap with each other in the axial direction.
Since the protrusion 45 is fitted, the protrusion 45 comes into contact with the portion corresponding to the enlarged notch 30 on the side surface of the brush 19 fitted into the fitting hole 27, and the brush excluding the opening 29 The inner surface of the brush holding part 21 and the protrusion 45 are brought into contact with the side surface of the brush holder 21 to stably support the brush 19, and the brush 1 is held in the fitting hole 27.
9 can be avoided from tilting. Furthermore, by providing an opening 29 in the side wall of the brush holding part 21 for taking out the lead wire, it is possible to wire the lead wire without protruding beyond the height of the brush holding part 21, and the lead wire can be wired without protruding beyond the height of the brush holding part 21. When the lead wire is wired at a height higher than the height of the brush holding part 21, the length in the axial direction of the DC motor 1 has to be increased in order to avoid interference between the lead wire wiring part and other parts. The electric motor 1 can be made more compact in the axial direction.

C. Effects of the invention As described above, according to the invention, the insulating substrate is joined by the fixing member to the support plate made of an insulating material fixed to the housing, and the insulating substrate has one side closed by the support plate. At the same time, since a rectangular box-shaped brush holding part that fits and holds the brush from the inner peripheral side is integrally provided, there is no need to complicate the shape of the support plate in order to avoid contact with the fixed member.
The support plate can be made into a simple shape while reducing the number of parts.

An opening for taking out the lead wire connected to the brush that is fitted and held in the brush holder runs along the circumferential direction of the insulating substrate and is provided on the side wall of the brush holder, so that the lead wire can be pulled out at a height higher than the height of the brush holder. It is possible to wire without protruding from the rotary electric machine, and it is possible to make the rotating electric machine more compact in the axial direction.

An enlarged notch is provided in the insulating substrate at a portion corresponding to the opening, and the notch is enlarged to correspond to the thickness of the side wall of the brush holder. Despite that,
The insulating substrate has no overlapping portion in the axial direction, and the insulating substrate can be easily molded using a simple upper and lower split mold.

In addition, the support plate is provided with a protrusion that is flush with the inner surface of the brush holder and fits into the enlarged notch, so that there is no protrusion on the side of the brush at the part corresponding to the enlarged notch. can be brought into contact with each other, the brush can be stably supported within the fitting hole, and the brush can be prevented from tilting.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal cross-sectional side view of a DC motor, Fig. 2 is an enlarged perspective view of main parts, Fig. 3 is a perspective view of an insulating substrate seen from one side, and Fig. Figure 4 is a perspective view of the insulating board viewed from the other side, Figure 5 is an enlarged cross-sectional view showing the breaker being held, Figure 6 is a perspective view of the support plate viewed from one side, and Figure 7 is a perspective view of the support plate viewed from the other side. FIG. 1...DC motor as a rotating electrical machine, 3...Yoke, 4, 5...Bracket, 6...Volt, 9
... Stator, 10 ... Rotor, 13 ... Rotating shaft, 18 ... Commutator, 19 ... Brush, 2
0... Insulating substrate, 21... Brush holding part, 22...
... Support plate, 26 ... Notch, 27 ... Fitting hole, 2
9...opening, 30...enlarged notch, 40...
Eyelet as a fixing member, 45...protrusion, 46...
Fitting protrusion.

Claims (1)

[Scope of utility model registration request] At both ends of the cylindrical yoke 3 equipped with the stator 9,
The housing 2 is constructed by fitting a pair of brackets 4 and 5 which are integrally connected by a bolt 6,
A commutator 1 is attached to an end of a rotating shaft 13 having a rotor 10 and rotatably supported by the housing 2.
8, and an insulating substrate 20 is fixed to the housing 2 to support the brush 19 in sliding contact with the commutator 18. The support plate 22 is formed into a ring plate shape from an insulating material and has a plurality of fitting protrusions 46 that fit into the support plate 22.
An insulating substrate 20, which is sandwiched and fixed between one of the brackets 4 and the yoke 3 and formed in a ring plate shape corresponding to the support plate 22, is coupled to the support plate 22 by a fixing member 40. The insulating substrate 20 is provided with a U-shaped notch 26 that is open toward the inner peripheral edge and closed on one side by the support plate 22, and is supported from the side edge of the notch 26. The cross section is approximately "U" shaped so as to cooperate with the support plate 22 to define a fitting hole 27 that protrudes on the opposite side from the plate 22 and for fitting and holding the brush 19 from the inner peripheral side of the insulating substrate 19. A rectangular box-shaped brush holding part 21 is integrally provided, and an opening for taking out the lead wire from the brush 19 is provided in the side wall of the brush holding part 21 along the circumferential direction of the insulating substrate 20. 29, and a brush holding portion 21 is provided on the insulating substrate 20 at a portion corresponding to the opening 29.
An "L"-shaped enlarged notch 30 is provided, which is the notch 26 enlarged to correspond to the thickness of the side wall.
The brush holding portion 21 is fitted into the enlarged notch 30.
A brush support structure for a rotating electric machine, characterized in that a protrusion 45 is protruded from a support plate 22 and is flush with an inner surface of the brush support structure.