JPH07336926A - Small motor - Google Patents

Abstract

PURPOSE:To easily perform clearance between a bearing and an armature shaft by providing a thin part for alignment being made in thickness dimension smaller than the thickness of the board of a case, outside the bearing of the case. CONSTITUTION:The inside diameter of a second bearing mount 5b where a bearing 6 on the side of an end cover is mounted is a little larger than the outside diameter o the bearing 6 on the side of an end cover, and at a thin part 5c for alignment is made a recessed groove 5c1, which is made in a ring shape from the inside and the outside of a motor yoke 2 to the body 5a of an end cover. And, if a pipe-shaped jig is pushed in the thin part 5c and then is pressed to prize the thin part 5c, the recessed groove 5c1 bends, and inclines the second bearing mount 5b on the body 5a of the end cover, and inclines the direction of the opening of the armature shaft insertion hole of the bearing 6 on the side of the end cover. As a result, the amount of clearance between the armature shaft and the bearing can be adjusted easily after incorporating the armature into the case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small motor incorporated in an actuator for opening and closing air-conditioning doors such as air-mix doors, mode doors, intake doors and bi-level doors provided in a vehicle air conditioner.

[0002]

2. Description of the Related Art Conventionally, as a small motor incorporated in an actuator for opening and closing an air conditioning door provided in an air conditioner for an automobile, an armature is housed inside a magnet attached to the inner circumference of a motor yoke. It is known that An end cover is fixed to the motor yoke at its open end.The motor yoke side bearing mounted on the side opposite to the motor yoke end cover and the end cover side bearing mounted on the end cover provide the armature for the armature. The shaft is rotatably supported.

In such a small motor, the armature shaft is rotated by the magnetic force generated by the armature coil and the magnetic force generated by the magnet by supplying a current to the armature coil provided in the armature, so that the armature shaft is rotated in the actuator. The air door of the air conditioner is opened or closed by moving an output arm connected to the shaft and actuating a rod connected to the air door.

[0004]

In the conventional small-sized motor described above, the bearing on the motor yoke side is a ball-type journal bearing movably attached to the motor yoke by a bearing pressing member via a spherical pair with respect to the inner surface of the motor yoke. Since the bearing on the end cover side is also a ball-type journal bearing that is attached to the end cover by the bearing pressing member so as to be movable via the spherical pair to the end cover, the tolerance between the armature shaft and both bearings is With the rotation of the motor yoke side bearing moves with respect to the motor yoke,
It is specified to be small by moving the bearing on the end cover side with respect to the end cover. Therefore, it is difficult to adjust the clearance amount between the armature shaft and the bearing after the end cover is attached to the motor yoke, and if the bearing on the end cover side and the bearing on the motor yoke side are inclined when assembled, the armature The initial target speed may not be reached because the rotation speed of the motor is reduced.Therefore, by adjusting the clearance amount when the end cover is attached to the motor yoke, the variation in motor characteristics and In addition to the problem that it is necessary to prevent erroneous shipment of defective products, the shape of the bearing pressing member for movably mounting both bearings on the motor yoke and end cover via spherical pairs can be complicated. Therefore, there is a problem that it may be a cause of poor productivity. Le bearings are more expensive than cylindrical journal bearing which is generally widely used, if it is possible to use a more general cylindrical journal bearing, there is a problem that attained a reduction in production costs.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a small motor which can very easily adjust the clearance between the bearing and the armature shaft, has good productivity, and can reduce the production cost.

[0006]

[Constitution of the invention]

[0007]

According to a first aspect of the present invention, there is provided a small motor, which is formed in a hollow cylindrical shape, in which a bearing is integrally provided in a central portion of an end face portion, and an inner circumference of the case. In a small motor provided with a magnet fixed to the portion and an armature arranged inside the magnet and having an armature shaft rotatably supported by the bearing of the case, the case is outside the bearing of the case.
The small-sized motor according to claim 2 of the present invention is characterized in that the case has a disk shape. End cover having a first bearing integrally formed in the central portion and a cylindrical shape having an opening portion on one surface, the end cover is fixed to the opening portion, and at the center portion of the end surface portion The second bearing is formed by a motor yoke integrally provided, and in the small motor according to claim 3 of the present invention, the thin portion for alignment has the first bearing on the end cover side. In the small-sized motor according to claim 4 of the present invention, the thin portion for alignment surrounds the outer peripheral side of the second bearing on the motor yoke side. Be formed on the motor yoke with According to the fifth aspect of the present invention, in the small-sized motor, the first bearing of the end cover having the thinned portion for alignment or the second bearing of the motor yoke having the thinned portion for alignment is formed. In the small motor according to claim 6 of the present invention, the thin portion for alignment is a concave groove formed on one of the outer side surface and the inner side surface of the case. In the small-sized motor according to claim 7 of the present invention, the thin portion for centering is a concave groove formed on both side surfaces of the case.

[0008]

In the miniature motor according to the first aspect of the present invention, when the thin portion for alignment is moved on the case, the bearing is displaced in the axial direction of the armature shaft. Therefore, the bearing is movably arranged on the case to rotatably support the armature shaft. In the small-sized motor according to claim 2 of the present invention, the end cover is provided with the first bearing, the motor yoke is provided with the second bearing, and the thin portion for alignment is provided on the end cover or on the motor yoke. Therefore, when the thin centering portion is moved on the end cover, the first bearing is displaced with respect to the axial direction of the armature shaft, and when the thinning center portion is moved on the motor yoke, the second bearing is moved. Bearing is displaced with respect to the axial direction of the armature shaft. Therefore, the first bearing or the second bearing is movably arranged on the end cover or the motor yoke to rotatably support the armature shaft. In the small-sized motor according to claim 3 of the present invention, when the thin portion for alignment formed around the outer peripheral side of the first bearing on the end cover side is moved on the end cover, only the first bearing is moved. It is displaced with respect to the axial direction of the armature shaft. Therefore, the first bearing is movably arranged on the end cover to rotatably support the armature shaft. In the miniature motor according to claim 4 of the present invention, when the thin portion for alignment formed around the outer peripheral side of the second bearing on the motor yoke side is moved on the motor yoke, only the second bearing is It is displaced with respect to the axial direction of the armature shaft. Therefore, the second bearing is movably arranged on the motor yoke and rotatably supports the armature shaft. In the small-sized motor according to claim 5 of the present invention, when the thin centering portion is moved on the end cover, the first bearing is displaced with respect to the axial direction of the armature shaft, and the thinning centering portion is the motor yoke. When moved up, the second bearing is displaced with respect to the axial direction of the armature shaft, and even if the first bearing or the second bearing is a cylindrical bearing and has no centering function, the end cover or the motor is It is movably arranged on the yoke and rotatably supports the armature shaft. In the small-sized motor according to claim 6 of the present invention, in the thin centering portion, a jig for centering is inserted into a concave groove formed on one of the outer side surface and the inner side surface of the case. Displaces the bearing with respect to the axial direction of the armature shaft. Therefore, the bearing is movably arranged on the case to rotatably support the armature shaft. In the small-sized motor according to claim 7 of the present invention, the thin-walled portion for centering has a bearing in the axial direction of the armature shaft by inserting a jig for centering into concave grooves formed on both side surfaces of the case. To be displaced. Therefore, the bearing is movably arranged on the case to rotatably support the armature shaft.

[0009]

1 to 6 show an embodiment of a small motor according to the present invention. 1 to 3 show a first embodiment of a small motor according to the present invention, and FIGS. 4 to 6 show a second embodiment of a small motor according to the present invention.

In the small motor 1 shown in FIG. 1, a case 25 is formed by a motor yoke 2 and an end cover 5. The motor yoke 2 has a motor yoke body 2a formed in a substantially cylindrical shape, and the motor yoke body. Two
and a top 2b formed so as to close one end side of a.

A cylindrical magnet 3 is attached to the inner peripheral surface of the motor yoke body 2a.

At the center of the top 2b, there is provided a first bearing mounting portion 2c formed in a substantially cylindrical shape. The first bearing mounting portion 2c is formed inside the motor yoke 2 in a concave shape. Therefore, the motor yoke side bearing 4 is mounted on the first bearing mounting portion 2c. The inner diameter of the first bearing mounting portion 2c is formed slightly larger than the outer diameter of the motor yoke side bearing 4, and the motor yoke side bearing 4 is a cylindrical journal bearing having a cylindrical shape, and the armature shaft is inserted in the center. A hole 4a is provided. The motor yoke side bearing 4 is supported in the first bearing mounting portion 2c by being housed in the first bearing mounting portion 2c. An end cover 5 is fixed to the open portion of the motor yoke body 2a.

The end cover 5 has a disk-shaped end cover body 5a, a second bearing mounting portion 5b formed in a substantially cylindrical projection at the center of the end cover body 5a, and the end cover body. 5a, and a thin centering portion 5c arranged outside the second bearing mounting portion 5b.

The outer peripheral edge of the end cover body 5a is integrally fixed to the motor yoke body 2a by caulking to an opening 2a1 provided at the other end of the motor yoke body 2a.

An end cover side bearing 6 is mounted on the second bearing mounting portion 5b. The inner diameter of the second bearing mounting portion 5b is formed slightly larger than the outer diameter of the end cover side bearing 6, and the end cover side bearing 6 is a cylindrical journal having a cylindrical shape like the motor yoke side bearing 4. It is a bearing and has an armature shaft insertion hole 6a in the center.
Is provided. The end cover side bearing 6 is housed in the second bearing mounting portion 5b, so that the second bearing mounting portion 5b
Supported within. The armature shaft insertion hole 6a of the end cover side bearing 6 is arranged at a position corresponding to the armature shaft insertion hole 4a of the motor yoke side bearing 4.

The second cover on the end cover body 5a
As shown in FIG. 2, on the outer side of the bearing mounting portion 5b, there is provided an aligning thin wall portion 5c formed in an annular shape having a thickness smaller than the plate thickness of the end cover body 5a. ,
A concave groove 5c formed by cutting the thin portion 5c from the inside of the motor yoke 2 with respect to the end cover body 5a and from the outside of the motor yoke 2 in a ring shape.
Since 1 is formed, the rigidity is lower than that of the end cover body 5a. The second bearing mounting portion 5b is arranged in the end cover 5 so as to be surrounded by the thin portion 5c.

Since the thin portion 5c has a ring-shaped concave shape on the end cover body 5a, as shown in FIG. 2, a pipe-shaped jig 20 preformed to correspond to the ring shape of the thin portion 5c is used. , The thin-walled portion 5c is inserted into the thin-walled portion 5c, and then the thin-walled portion 5c is pressed to pry the thin-walled portion 5c.
Has a lower rigidity than that of the end cover body 5a, the concave groove 5c1 of the thin portion 5c is distorted and the second bearing mounting portion 5b is inclined on the end cover body 5a, whereby the second bearing mounting The opening direction of the armature shaft insertion hole 6a of the end cover side bearing 6 arranged in the portion 5b is inclined.

On the other hand, in the motor yoke 2, the armature 7, the holder base 8, the brush cases 9 and 10, the brush 1 are provided.
1, 12 are arranged, and the armature 7 includes an armature shaft 13, an armature core 14, an armature coil 15, and a commutator 16.

The armature shaft 13 has a length dimension larger than the length from the end cover 5 to the top 2b. One side is inserted into the armature shaft insertion hole 6a of the end cover side bearing 6 and the other side is a motor. Armature shaft insertion hole 4a of the yoke side bearing 4
Since it is inserted inside and protrudes outward from the top 2b, it is rotatably supported by the end cover side bearing 6 and the motor yoke side bearing 4. Also,
A first knurled portion 13a is provided substantially at the center of the armature shaft 13, and the first knurled portion 13a on the armature shaft 13 is provided.
Since the second knurled portion 13b is provided in the vicinity of, the armature core 14 formed by stacking a plurality of plates is fixed to the first knurled portion 13a, and the second knurled portion 13b is made of a resin cylinder. The commutator 16 is fixed. The armature core 14 is formed with coil winding portions 14a corresponding to a predetermined number of slots.

A commutator piece 16a made of a conductive material is fixed on the outer peripheral surface of the commutator 16 in the same number as the coil winding portions 14a, and the enamel wires electrically connected to the commutator pieces 16a, respectively. Is wound around each winding portion 14a of the armature core 14 to form the armature coil 15. The enamel wire is wound around the winding portion 14a of the armature core 14 by single winding or double winding.

On the outer periphery of the commutator 16, there is disposed a holder base 8 having a disk shape and having a commutator insertion hole 8a formed in the center, and brush cases 9 and 10 are attached to the holder base 8 at two opposing positions. ing.
Since the brushes 11 and 12 are housed in the brush cases 9 and 10 via the brush springs 9a and 10a, one brush 11 is one brush spring 9a.
The elastic repulsive force of a is pressed against the commutator piece 16a of the commutator 16, and the other brush 12 is pressed against the commutator piece 16a of the commutator 16 by the elastic repulsive force of the other brush spring 10a. Each brush 11, 12 has a respective pigtail 11a, 12a
Is electrically connected to an external circuit (not shown).

In the compact motor 1 having such a structure, one end of the armature shaft 13 is inserted into the armature shaft insertion hole 6a of the end cover side bearing 6 attached to the second bearing mounting portion 5b of the end cover 5, The brushes 11 and 12 are brought into pressure contact with the commutator piece 16a of the commutator 16 via the brush springs 9a and 10a, and then the motor yoke side bearing 4 is attached to the first bearing mounting portion 2c.
The motor yoke 2 attached with is attached to the armature 7, and the open portion 2a1 of the motor yoke 2 is swaged to the outer peripheral edge of the end cover body 5a to fix the end cover 5 to the motor yoke 2 and finish the assembling.

In this state, an external circuit for inspection is electrically connected to the pigtails 11a and 12a through a terminal (not shown), and then each pigtail 11 is connected through the external circuit.
When a potential difference is generated between a and 12a, one brush 1
1. One commutator piece 16a pressed against the brush 11, an armature coil 15 for each winding portion 14a of the armature core 14 electrically connected to the commutator piece 16a, and another armature coil 15 connected to the armature coil 15. One commutator piece 16a, the other brush 12 pressed against the other commutator piece 16a
Current flows to each winding portion 14a of the armature core 14
Since the armature coil 15 is sequentially excited every time, a magnetic force is generated, and the armature 7 is rotated by the Fleming's left-hand rule by the magnetic force from the armature coil 15 and the magnetic force generated from the magnet 3.

Therefore, when the rotation speed of the armature 7 is smaller than the target value when a current of a value determined for inspection is supplied to the small motor 1 from the external circuit for inspection, the cure shown in FIG. By inserting the tool 20 into the thin-walled portion 5c and then pressing the thin-walled portion 5c in a twisting manner, the concave groove 5c1 of the thin-walled portion 5c is distorted and the second bearing mounting portion 5b is placed on the end cover body 5a. Incline,
Since the opening direction of the armature shaft insertion hole 6a provided in the end cover side bearing 6 arranged in the second bearing mounting portion 5b is also inclined, the end cover side bearing 6 and the end cover side bearing 6 are kept until the rotation speed of the armature 7 reaches a target value. The clearance between the armature shaft 13 and the armature shaft 13 is adjusted.

Then, the small motor 1 is assembled to an actuator, and an output arm is connected to a portion of the armature shaft 13 projecting from the top 2b through a reduction mechanism in the actuator. Pigtail 11 connected to the air conditioning door
Since an external circuit in the vehicle is electrically connected to a and 12a via a terminal (not shown), after mounting on the vehicle,
When the mode switching is performed by the occupant, the armature 7 rotates, so that the armature shaft 13 is rotated.
Thus, the output arm is rotated to operate the air conditioning door of the air conditioner.

A second embodiment of a small motor according to the present invention is shown in FIGS.

In this case, as shown in FIG. 4, in the small motor 1, a motor yoke side bearing 17, which is a ball type journal bearing, is attached to the first bearing mounting portion 2c provided in the central portion of the top 2b. The thin-walled portion 5c for centering is cut into a circular shape from the outside of the motor yoke 2 with respect to the end cover body 5a to form a ring-shaped concave groove 5c1.
Is formed, and the other parts are the same as those in the first embodiment.

In this case as well, when the rotation speed of the armature 7 is smaller than the target value when a current of a value determined for inspection is supplied to the small motor 1 from the external circuit for inspection, as shown in FIG. The jig 20 shown is inserted into the thin-walled portion 5c, and then the thin-walled portion 5c is pressed so as to be distorted, whereby the thin-walled portion 5c is distorted and the second bearing mounting portion 5
Since b is inclined on the end cover body 5a and the opening direction of the armature shaft insertion hole 6a provided in the end cover side bearing 6 arranged in the second bearing mounting portion 5b is also inclined, the rotation speed of the armature 7 is reduced. The clearance between the end cover side bearing 5 and the armature shaft 13 is adjusted until the target value is reached.

Further, as shown in FIG. 6, the thin centering portion 5c has a ring-shaped concave groove 5c1 formed by cutting a circular shape from the inside of the motor yoke 2 with respect to the end cover body 5a. Of course, in that case, the entire second bearing mounting portion 5b is tilted by the jig 20 shown in FIG.

[0030]

As described above, according to the small motor of the present invention, the clearance amount between the armature shaft and the bearing can be adjusted after the armature is installed in the case, and the armature should be accommodated in the case by any chance. Even if a defect is discovered after it has been installed in the product, it is extremely easy to correct the defect from the outside to eliminate the problem and reduce the variation in motor characteristics, reduce noise, and improve the dimensional accuracy of each component. Since it is not necessary to increase the product cost, it is possible to prevent erroneous shipment of defective products, improve productivity, and assemble with low-cost bearings, which leads to an excellent effect of reducing production cost.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view of a first embodiment of a small motor according to the present invention.

FIG. 2 is an external perspective view of an area around an end cover in the small motor shown in FIG.

3 is an enlarged cross-sectional view around a thin portion for centering in the small motor shown in FIG.

FIG. 4 is a partial vertical cross-sectional side view of a second embodiment of a small motor according to the present invention.

5 is an enlarged cross-sectional view around a thin portion for alignment in the small motor shown in FIG.

6 is an enlarged cross-sectional view around a thin portion for alignment different from the thin portion for alignment of the small motor shown in FIG.

[Explanation of symbols]

 1 small motor 2 motor yoke 3 magnet 4 (bearing) (first bearing) motor yoke side bearing 5 end cover 5c centering thin portion 5c1 concave groove 6 (bearing) (second bearing) end cover side bearing 13 armature Shaft 25 case

Claims (7)

[Claims] 1. A case which is formed in a hollow cylindrical shape and in which a bearing is integrally provided in a central portion of an end surface portion, a magnet fixed to an inner peripheral portion of the case, and a case which is disposed inside the magnet In a small motor having an armature having an armature shaft rotatably supported by a bearing of, a case is formed on the outer side of the bearing of the case with a thickness smaller than the plate thickness of the case, and has a thin centering wall. A small motor, which is provided with a section. 2. The case has a disk shape, and has a first portion at the center.
End cover integrally provided with the above bearing and a cylindrical shape having an opening on one surface, the end cover is fixed to the opening, and the second bearing is integrally provided at the center of the end face portion. The small motor according to claim 1, wherein the small motor is formed by the motor yoke. 3. The thin portion for alignment is provided at the first end cover side.
The small motor according to claim 2, which is formed on the end cover so as to surround the outer peripheral side of the bearing. 4. The thin portion for alignment is provided on the second side of the motor yoke.
The small motor according to claim 2, which is formed on the motor yoke so as to surround the outer peripheral side of the bearing. 5. The first bearing of the end cover in which the thin portion for alignment is formed or the second bearing of the motor yoke in which the thin portion for alignment is formed is a cylindrical bearing.
The small motor according to any one of 3 and 4. 6. The thin portion for alignment is a concave groove formed on one of the outer side surface and the inner side surface of the case, according to any one of claims 1, 2, 3, 4, and 5. Small motor. 7. The small motor according to claim 1, wherein the thin centering portion is a concave groove formed on both side surfaces of the case.