JPH033635A - Motor - Google Patents

Abstract

PURPOSE:To improve working efficiency by mechanically holding a brush holder in a housing section and by electrically connecting with a terminal facing the housing section when the brush holder is inserted into the housing section. CONSTITUTION:A brush holder 23 inserted into a housing section 20 by forcible insertion is prevented from coming off from the housing section 20 as its anchor tongue 28 is anchored to a tongue 10 of a terminal 7a and a stopper piece 26 of the brush holder 23 is brought into contact with a motor frame 15, so that the brush holder 23 is prevented from stepping ahead. The brush holder 23 is therefore fixed to the housing section 20. On the other hand, the tongue 10 of the terminal 7a connected to a field winding 3 is pressure-welded to the brush holder 23. Since a carbon brush 30 is slidingly enclosed to tms brush holder 23, the field winding 3 and the carbon brush 30 are electrically connected through the terminal 7a and brush holder 23. The working efficiency can thereby be improved and the electric connection can surely be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric motor, and particularly to a support structure for a brush holder thereof.

[Conventional technology]

For example, in a conventional motor used in a juicer, mixer, etc., as shown in FIG. A motor frame 53 is connected to the motor frame 50. The motor frame 53 is made of an insulating material, and brush holders 54, 54 are attached to positions facing each other.

The brush holders 54, 54 have a substantially rectangular cylindrical shape, and a carbon brush 55 is slidably housed in each of the brush holders 54, 54. The carbon brush 55 is electrically connected to a brush cap 57 via a lead wire 56. And brush cap 57
is electrically connected to the field winding 52 by a covered cord 58.

The carbon brush 55 is pressed by a spring 59 housed in the brush holder 54, and its tip is attached to the motor shaft 6.
It is designed to come into sliding contact with a commutator 61 provided at 0.

The motor shaft 60 is attached to the rotor 62 and supported by a bearing 63 attached to the motor frame 55.

[Problem to be solved by the invention]

However, in the above conventional structure, the brush holder 5
When attaching the 4.54 to the motor frame 53, a special bracket (not shown) is used, but such a structure increases the number of parts. In addition, a method for attaching the brush holder to the motor frame 53 has been adopted in which the brush holder is formed integrally with the motor frame 53, but in this case, molding becomes complicated. Therefore, all of these conventional brush holder support structures are expensive.

Further, the carbon brush 55 and the field winding 52 are electrically connected by a coated cord 58.1. In this case, since the covered cord 58 is connected to the brush cap 57 by soldering, the brush holder 54.5
The work of attaching the carbon brush 55 to the motor frame 53 and the work of electrically connecting the carbon brush 55 and the field winding 52 are separated from each other, resulting in a problem of low work efficiency.

The coated cord 58 is connected to the brush cap 57 by soldering, but soldering not only requires time and effort, but also causes variations in the strength of the joint, and there is a risk that the part may come off. be.

The present invention has been made based on the above circumstances, and is an electric motor that has a small number of parts, can perform mechanical support and electrical connection of a brush holder at the same time, improves work efficiency, and prevents defective electrical connections. This is an attempt to reconcile the following.

[Means to solve the problem]

The first aspect of the present invention is to attach a terminal block made of an insulating material to a field assembly, attach a terminal connected to a field winding to this terminal block, and attach a motor frame made of an insulating material to the terminal block. A housing part is formed between the terminal block and the motor frame, and the terminal is made to face the housing part. A brush holder is fitted into the housing part, and the brush holder has at least a portion that contacts the terminal. is formed of a conductive material, and when the brush holder is held in the housing part, the brush holder and the terminal are electrically connected.

The second aspect of the present invention is to fix the motor frame to the field assembly, and press the terminal block with the abutment part of the housing formed between the motor frame and the terminal block, thereby moving the terminal block into the field. It is characterized in that the pressing is fixed to the assembly.

The third aspect of the present invention is that the brush holder is formed by bending a conductive metal plate to form a cylindrical body, and when the brush holder is bent, a gap is formed between opposing ends of the cylindrical body, which can be brought into contact and separated by elastic deformation of the cylindrical body. It is characterized by the formation of

Furthermore, the fourth aspect of the present invention is that the brush holder is provided with a lid that extends integrally from one end of the cylindrical body and is bent to close the opening at the end of the cylindrical body, and is housed in the brush holder. the brush cap is electrically connected to the brush cap, the brush cap is applied to the opening of the brush holder, and the brush cap is pressed and fixed by the lid by bending the lid;
The brush cap is provided with a fitting piece along the outer wall of the cylindrical body, and the fitting piece is provided between the inner surface of the housing part and the outer wall of the cylindrical body accommodated in the housing part. It is characterized by being inserted into the formed gap.

[Effect]

According to the first aspect of the present invention, when the brush holder is inserted into the housing portion formed between the terminal block and the motor frame,
This brush holder is mechanically held in the housing part and is electrically connected to the terminal facing the housing part, so the brush holder installation work and electrical connection work are done at the same time. .

Further, according to the second aspect of the present invention, since the terminal block is fixed between the motor frame and the field assembly, movement of the terminal block is prevented, and the shape and positioning of the housing part are ensured. This makes it easy to insert the brush holder.

Furthermore, according to the third aspect of the present invention, since the cylindrical body of the brush holder can be reduced in diameter by elastic deformation, it can be press-fitted into the housing even if the size of the housing varies.

Furthermore, according to the fourth aspect of the present invention, the brush is electrically connected to a brush cap separate from the brush holder, and the brush cap is installed in the opening of the brush holder and formed at the end of the brush holder. When the lid is bent, it is pressed down and fixed by the lid, so when replacing a worn-out brush with a new one, you can connect the new brush to the brush cap in advance and save yourself the hassle of soldering. It can be easily attached to the brush holder without any special work. In this case, the fitting piece formed on the brush cap is inserted and positioned in the gap formed between the housing part and the brush holder, so that the brush cap is securely fixed.

〔Example〕

Hereinafter, regarding the present invention, the first embodiment shown in FIGS. 1 to 6 will be explained.
This will be explained based on an example.

In the figure, reference numeral 1 denotes a field assembly serving as a stator, and what is used for an iron core 2 and a field winding 3 wound around the iron core 2.

A terminal block 5 is attached to the iron core 2.

The terminal block 5 is made of an insulating material such as synthetic resin,
It has a frame shape and is in contact with the end face of the iron core 2. This terminal block 5 has support stands 6 protruding from four corners thereof. Terminals 7a, 7a, 7b, and 7b are attached to the tips of these supports 6, respectively.

These terminals 7a, 7a, 7b, 7b are connected to the ends 3a, 3a of the field winding 3, as shown in FIG. A pair of opposing terminals 7a, 7a are connected to the brush holder of the present invention, and another pair of opposing terminals 7b, 7b are connected to a power source.

The structure of the terminal 7a connected to the brush holder and its attachment will be explained based on FIG. 3. The support base 6 has a prismatic shape, for example, and has a fitting hole 8 at its upper end. Triangular notch holes 9a and 9b are formed in opposing side walls of the fitting hole 8 and open at the upper end. The terminal 7a is formed from a small piece made of a conductive material, and the tongue piece 10
A bent portion 11 is formed at one end. This bent portion 11 has a triangular notch hole 12 open at its lower end.

When the bent portion 11 of the terminal 7a is press-fitted into the fitting hole 8 of the support base 6, the bent portion 11 snaps into the fitting hole 8, so that the terminal 7a
a is fixed to the support stand 6. In this case, the end portion 3a of the field winding 3 is passed through the triangular notch holes 9a and 9b formed in the opposing side walls of the fitting hole 8, and when the bent portion 11 of the terminal 7a is pushed in, the notch of the terminal 7a is cut out. When the end 3a of the winding 3 is inserted through the hole 12, the end 3a of the field winding 3 is sandwiched between the notch holes 9a, 9b of the support base 6 and the notch hole 12 of the terminal 7a. field winding 3
The connection between the terminal 7a and the terminal 7a is made firmly.

In this case, the tongue piece 10 of the terminal 7a is oriented substantially horizontally toward the center.

A terminal 7 a s 7 a is attached to each such support stand 6...
A motor frame 15 is connected to the terminal block 5 provided with 7b and 7b. The motor frame 15 is made of an insulating material such as synthetic resin, and has legs 16.16 at both ends.
It is equipped with These legs 16.16 are inserted with screws 17.17 shown in FIG. It is connected to iron core 3.

The motor frame 15 is formed with a rectangular concave portion 19.19 located on one side of the leg portion 16.16 and facing the terminals 7a, 7a. These recesses 1
9.19 attaches this motor frame 15 to the screw 17.
17, when fixed to the iron core 3, the terminals 7a, 7a
These recessed portions 19
．． As shown in FIG. 4, a rectangular cylindrical housing portion 20.20 is formed between the support base 6.6 and the support base 6.6.

These housing parts 20.20 are formed in symmetrical positions with respect to the center line, and the openings on the inside face each other.

The tongue piece 10 of the terminal 7a faces the lower surface of these housing parts 20.20.

A brush holder 2 is installed in the housing part 20.20.
3.23 is accommodated.

As shown in FIGS. 5 and 6, the brush holder 23 includes a substantially rectangular cylindrical main body 24 made of a plate made of a conductive material such as a copper alloy, and a main body 24 formed of a plate made of a conductive material such as a copper alloy. It is formed of an extended and bent lid part 25 and a stopper piece 26.

In this case, the prismatic cylindrical main body 24 of the brush holder 23 is formed by bending a conductive plate into a prismatic cylindrical shape, so that both ends of the plates abut each other, and these abutting ends have a slight gap 27. Brush holder 23
can be elastically deformed and reduced in diameter.

A locking tongue piece 28 is formed on the bottom wall of the brush holder 23 and is cut and raised outwardly, and this locking tongue piece 28 locks on the tongue piece 10 of the terminal 7a and is removed. Exit is now blocked.

A carbon brush 30 is slidably housed in the brush holder 23. The carbon brush 30 is urged by a spring 31 inserted between the carbon brush 30 and the cover 25 of the brush holder 23 so as to be pushed out toward the other end.

Further, a lead wire 3 is connected between the lid portion 25 and the carbon brush 30.
It is electrically connected by 2.

Such a brush holder 23.23 is press-fitted from the outside of the housing part 20.20, as shown in the left half of FIG. By this press fitting, the lower surface of the brush holder 23 slides on the upper surface of the tongue piece 10 of the terminal 7a and is inserted into the housing part 20, as shown in the right half of FIG.
The locking tongue piece 28 formed on the bottom wall of the brush holder 23 locks on the tongue piece 10 of the terminal 7a, thereby preventing the brush holder 23 from being pulled out from the housing 20-.

In this case, the stopper piece 26 of the brush holder 23 hits the outer surface of the motor frame 15, as shown by the two-dot chain line in FIG. 2, and is prevented from entering further. therefore,
The brush holders 23, 23 are attached to the housing part 20.2.
It is fixed to 0.

In this state, the tongue piece 10 of the terminal 7a connected to the field winding 3 is in pressure contact with the bottom surface of the brush holder 23, and the carbon brush 30 is slidably housed in the brush holder 23. Therefore, the field winding 3 and the carbon brush 30 are electrically connected via the terminal 7a and the brush holder 23.

The carbon brushes 30, 30 are each pressed toward the center by a spring 31.3, and a commutator 41 is disposed at the center, as shown in FIG.

The commutator 41 is provided on a motor shaft 40, which is attached to a rotor (not shown) and supported by a bearing 43 that is self-alignably attached to the motor frame 15.

Therefore, the carbon brushes 30, 30 are in sliding contact with the commutator 41, respectively.

In such a configuration, the carbon brush 30 is housed in the brush holder 23 in advance, and the spring 31 and the lead wire 32 are incorporated in a state that can perform a predetermined function to form the brush holder 23 into a unit. As shown in the left half of FIG. 2, it is press-fitted into the housing part 20.

By this press-fitting, the brush holder 23 is inserted into the housing part 20, and as shown in the right half of FIG. This prevents the brush holder 23 from being removed from the housing portion 20, and the stopper piece 26 of the brush holder 23 contacts the outer surface of the motor frame 15, thereby preventing the brush holder 23 from entering.

Therefore, the brush holder 23.23 is fixed to the /% housing part 20.20.

In this case, the tongue piece 10 of the terminal 7a connected to the field winding 3 is pressed against the bottom surface of the brush holder 23, and the carbon brush 30 is slidably housed in the brush holder 23, so that Eventually, the field winding 3 and the carbon brush 30 are electrically connected via the terminal 7a and the brush holder 23.

Therefore, simply by inserting the brush holder unit into the housing portion 20, the brush holder 23 can be mechanically attached and an electrical connection can be made, resulting in good workability. This reduces the number of man-hours and enables automatic assembly.

When the brush holder 23 is inserted into the housing part 20, the locking tongue piece 28 formed on the bottom wall of the brush holder 23 locks on the tongue piece 10 of the terminal 7a, and the stopper piece 26 of the brush holder 23 locks on the tongue piece 10 of the terminal 7a. is motor frame 15
By hitting the outer surface of the brush holder 23, the movement of the brush holder 23 is prevented, so that the brush holder 23, 23 is securely fixed, and problems such as misalignment can be prevented.

Further, the housing part 20 includes a support base 6 for the terminal block 5...
and the concave portion 19.19 formed in the motor frame 15, so there is no significant increase in the number of parts.

In this case, the legs 16.16 of the motor frame 15 are directly connected to the iron core 3 by screws 17.17, and the lower surface 19a (shown in FIG. 4) of the recess 19 formed in the motor frame 15 is connected to the upper surface of the support base 6. This motor frame 1
Since the terminal block 5 is pressed against the iron core 3 by the terminal block 5, not only is the terminal block 5 supported only by the windings of the field winding 3 prevented from lifting up, but also the shape of the housing part 20 is ensured.

Furthermore, even if the shape of the housing part 20 varies slightly, the brush holder 23 will not be elastically deformed because the rectangular cylindrical main body 24 of the brush holder 23 is made by bending the conductive plate and forming a gap 27 at the butting ends. Therefore, even if the housing part 20 is slightly deformed, it can be reliably inserted into the housing part 20, and the connection with the terminal 7a can be reliably maintained.

Also, press fit the brush holder 23 into the housing part 2o,
Since the rectangular cylindrical main body 24 is elastically deformed and comes into contact with the inner surface of the housing part 20, even if vibration or thermal deformation occurs, the brush holder 23 absorbs it and can prevent rattling.

Note that the present invention is not limited to the first embodiment described above.

That is, FIGS. 7 and 8 show a second embodiment of the present invention, and in this embodiment, a tongue piece 10 is provided on the side surface of the support base 6.
Ribs 45 and 45 facing each other are formed.

In such a configuration, the tongue piece 10 of the terminal 7a is supported by the ribs 45, 45, so that the tongue piece 10 is prevented from deforming downward. That is, even if the thickness of the conductive plate constituting the terminal 7a is made thinner and the elastic force is lowered, the rib 45
．． 45 prevents deformation of the tongue piece 10, thus making it possible to economize on the materials used.

Further, the third embodiment shown in FIGS. 9 to 11 is suitable when the carbon brush 30 is worn out and needs to be replaced.

That is, a gap 46 is formed between the housing part 20 and the side surface of the brush holder 23 accommodated therein. In addition, a new carbon brush 30 for replacement is connected in advance to the brush cap 47 using a lead wire 32, and is assembled by passing a spring 31 between them, which is also made into a unit. There is. A fitting piece 48 extends from the brush cap 47 and is bent.

A case in which brushes are replaced using such a carbon brush unit will be described.

If the brush 30 attached to the brush holder 23 is worn out and becomes unusable, the brush holder 23 cannot be removed, so bend the cover 25 and remove the brush holder 23.
Open the end. Then, the lead wire 32 connected to this lid portion 25 is cut, and the abrasion brush 30, spring 31, and lead wire 32 that were being used are taken out.

Next, the brush 30, which has been previously connected to the brush cap 47 using the lead wire 32 and the spring 31 as described above, is inserted from the open end of the brush holder 23, and the brush cap 47 is inserted into the open end of the brush holder 23. Assign it to At this time, the fitting piece 48 is placed along the outer surface of the brush holder 23 and inserted into the gap 46 formed between the housing part 20 and the brush holder 23.

In this state, the lid portion 25 with the open end is bent again so as to close the open end. By this bending, the lid parts 2 and 5 come into contact with the outer surface of the brush cap 47 and hold this brush cap 47.

In this way, since the brush cap 47 is supported by the lid part 25, it will not come off in the axial direction, and the fitting piece 48 is inserted into the gap 46 between the housing part 20 and the brush holder 23. Therefore, the brush cap 47 does not move in any of the up, down, left, and right directions perpendicular to the axial direction.

Therefore, with the above-described brush replacement structure, even if the brush holder 23 cannot be removed from the housing part 20, it can be replaced with a new brush, and since soldering is not required, the brush can be replaced even in a narrow motor case. Replacement work can be done efficiently without the need for troublesome work.

In each of the above embodiments, the recessed portion 19 is formed in the motor frame 15, and the recessed portion 19 on the motor frame 15 side
However, in the present invention, a concave portion is formed on the terminal block 5 side, and the housing portion 20 is formed between the concave portion on the terminal block side and the motor frame. may be configured.

Furthermore, the electric motor of the present invention is not limited to juicers, mixers, and the like.

In addition, various changes can be made to the present invention within the scope of the scope of the claims.

〔Effect of the invention〕

As explained above, according to the first aspect of the present invention, when the brush holder is inserted into the housing portion formed between the terminal block and the motor frame, the brush holder is mechanically held by the housing portion, and the brush holder is mechanically held by the housing portion. Therefore, since the brush holder installation work and the electrical connection work can be done at the same time, the work efficiency is improved. In this case, there is no need for special brackets or coated cords, so the number of parts is reduced, and since no soldering is required, the reliability of the electrical connection is increased.

Further, according to the second aspect of the present invention, the terminal block is sandwiched and fixed between the motor frame and the field assembly, so movement of the terminal block is prevented, and the shape and positioning of the housing part are ensured. This makes it easy to insert the brush holder.

Furthermore, according to the third aspect of the present invention, since the cylindrical body of the brush holder can be reduced in diameter by elastic deformation, it can be press-fitted into the housing even if the size of the housing varies.

Furthermore, according to the fourth aspect of the present invention, when replacing a worn out brush with a new one, if the new brush is connected to the brush cap in advance, the new brush can be replaced without the need for troublesome work such as soldering. Can be easily attached to a holder. In this case, the fitting piece formed on the brush cap is inserted and positioned in the gap formed between the nozzle housing part and the plan holder, so that the brush cap can be securely fixed.

[Brief explanation of drawings]

1 to 6 show a first embodiment of the present invention. FIG. 1 is an exploded perspective view of the stator side of the electric motor, and FIG. 3 is an exploded perspective view to explain how the terminal is assembled, and FIG. 4 is a sectional view taken along line X-X in FIG. 9.
Figure 5 is a plan view of the brush holder, Figure 6 is its side view,
7 and 8 show a second embodiment of the present invention, FIG. 7 is a side view of the support base, FIG. 8 is a rear view thereof, and FIGS. 9 to 11 are views of the support base. 9 is a view in the direction of the arrow corresponding to FIG. 4, and FIG. 10 is a sectional view taken along line X-X in FIG. 9 showing a state in the middle of assembly.
Fig. 11 is a sectional view showing the state after assembly;
The figure is a front view showing a stator of a conventional electric motor. 1...Field assembly, 2...Iron core, 3.
...Field winding, 40...Motor shaft, 41...
Commutator 5... terminal block, 6... support stand, 7a... terminal 1,
/In Figure 2 Figure 7 Figure 8

Claims (4)

[Claims] (1) A brush holder is attached to the field assembly including the iron core and field winding via a motor frame made of an insulating material, a brush is slidably housed in this brush holder, and this brush is installed on the motor shaft. In an electric motor that is pressed into sliding contact with the commutator, a terminal block made of an insulating material is attached to the field assembly, and a terminal connected to the field winding is attached to the terminal block, and the terminal A motor frame made of an insulating material is connected to the base, and a housing portion in which the terminals are exposed is formed between the terminal block and the motor frame, and a brush holder containing the brush is fitted into the housing portion, At least a portion of the brush holder that contacts the terminal is made of a conductive material, and when the brush holder is fitted and held in the housing part, the brush holder is electrically connected to the terminal. An electric motor featuring: (2) By fixing the motor frame to the field assembly, the terminal block is pressed by the abutment part forming the housing part formed between the motor frame and the terminal block, and the terminal block is placed in the field. Electric motor according to claim 1, characterized in that it is pressed against an assembly. (3) The brush holder is formed by bending a conductive metal plate to form a cylindrical body, and a gap is formed between the bent and opposing ends of the cylindrical body so that the cylindrical body can be brought into contact with and separated from it by elastic deformation. The electric motor according to claim 1, characterized in that: (4) The brush holder has a lid that extends integrally from one end of the cylindrical body and is bent to close the opening at the end of the cylindrical body, and the brush holder has a cover that closes the opening at the end of the cylindrical body, and the brush holder has a lid that extends integrally from one end of the cylindrical body and is bent to close the opening at the end of the cylindrical body, and the brush holder has a cover that closes the opening at the end of the cylindrical body. The brush cap is electrically connected to the brush cap, the brush cap is applied to the opening of the brush holder, the brush cap is pressed and fixed by the lid by bending the lid, and the brush cap is attached to the brush cap. is provided with a fitting piece along the outer wall of the cylindrical body,
According to the first claim, the fitting piece is fitted into a gap formed between the inner surface of the housing part and the outer wall of the cylindrical body accommodated in the housing part. Electric motor listed.