JP2504801Y2 - Flat motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a flat motor for rotationally driving, for example, a blower fan for an automobile, and more particularly to improvement of a casing structure thereof.

(Prior Art) For example, a flat motor 1 as shown in FIG. 3 is known as a motor for rotationally driving a fan or a condenser cooling fan incorporated in an intake unit of an automobile air conditioner.

This flat motor 1 has a rotor 3 in which a flat ring-shaped armature 2 is formed. In this rotor 3, a rotary shaft 4 is rotatably supported by bearings 6 and 6 mounted on a pair of casings 5a and 5b. It is supported. Magnets 7 are circumferentially mounted on the inner surface of the casing 5a on one side surface of the armature 2 at a predetermined distance, and an intermediate yoke 8 is arranged on the other side surface of the armature 2 at a predetermined distance. The magnetic lines of force emitted from the magnet 7 cross the armature 2 and return to the magnet 7 through the intermediate yoke 8.

The armature 2 has a resin-molded amateur coil (not shown), and is arranged between the magnet 7 and the intermediate yoke 8 by supplying a current to the amateur coil via the commutator 9 and the brush 10. Rotational force is generated in the armature 2 to rotate the rotor 3 together with the rotation shaft 4.

(Problems to be Solved by the Invention) The pair of casings 5a and 5b in the flat motor 1 as described above are caulked and fixed on the outer periphery together with the intermediate yoke 8.

When fixing by caulking, one casing 5a
As shown in FIG. 4, the intermediate yoke 8 is pushed by the curved portion (usually referred to as the rounded portion) generated when the first casing 5b is bent for the first time. When it moves, the other casing 5a also moves inward in the radial direction accordingly, and the two casings 5a, 5a
There is a risk that the center position of b will be displaced and the rotary shaft 4 cannot be attached at a right angle to both casings.

Further, the flat motor 1 is provided with an intermediate yoke 8 and both casings 5a, 5b in order to prevent water or the like from entering from the outside.
The sealant S (see FIG. 4) is applied in an annular shape between and, but in this case, since the sealant S is applied between the flat plate materials, it is not possible to remove the sealant S by caulking as described above. There is a gap between the two, or the sealing agent S flows inward of the flat motor, and depending on the amount of the sealing agent S applied,
There is also a risk that the rotation of the amateur 2 may be hindered after it solidifies.

Further, since the sealant S is sandwiched between the flat plate materials, the axial position of the intermediate yoke 8 varies due to variations in the amount of application and the manner of application, and the distance between the intermediate yoke 8 and the rotor 3 becomes smaller. There is a risk that it may become unstable and hinder the rotational operation of the motor. Moreover, since the sealing agent S has to be applied annularly between the intermediate yoke 8 and the one casing 5b and between the intermediate yoke 8 and the other casing 5a, the number of times of applying the sealing agent S is large and the work is difficult. It's a hassle.

Further, when the intermediate yoke 8 is formed by pressing or the like, burrs or the like are generated at the cut end portion, but there is no place for the burrs to escape, and there is a risk that the burrs may enter between the plate materials at the time of caulking and cause a gap between the plate materials. Therefore, conventionally, a so-called coining process for forming a recess O in the base of the outer end of the one casing 5b is performed so that the burr enters the recess O. However, this process is incidental to the original manufacturing work of the flat motor, and there is a problem that the manufacturing work efficiency of the flat motor main body is lowered and the cost is increased.

The present invention has been made in order to solve the problems of the prior art, and the accuracy of assembling the rotary shaft with respect to the casing and the accuracy of the position of the intermediate yoke in the axial direction are extremely high, and the manufacturing work efficiency can be improved. It is another object of the present invention to provide a flat motor that is advantageous.

[Structure of the Invention] (Means for Solving the Problem) The present invention for achieving the above object comprises a rotor having a flat ring-shaped armature formed therein, and a pair of middle-matching casings. The outer end of one of the pair of casings is bent to fix the outer end of the other casing by crimping, and the casing that rotatably supports the rotating shaft of the rotor, and one side surface of the armature. A flat motor having a magnet disposed in the casing so as to be located in the casing, and an intermediate yoke disposed on the other side surface side of the armature and having an outer end sandwiched between the pair of casings. By positioning the outer end of the yoke radially inward of the outer end of the other casing, the outer end of the intermediate yoke is moved radially outward. A difference portion is formed to directly sandwich the outer end of the intermediate yoke between the pair of casings, and a sealing agent is provided in a closed space formed by the casing in which the step portion and the outer end portion are bent. It is a flat motor that is loaded.

(Operation) In such a flat motor according to the present invention,
The outer end of one casing is bent, and the three members of the pair of casings and the intermediate yoke are caulked and fixed together.The outer end of the intermediate yoke is radially outside the intermediate yoke between the intermediate yoke and the other casing. Since the curved portion of the outer end portion enters the step portion formed in one direction, it is possible to avoid the possibility that the intermediate yoke is pushed in the direction perpendicular to the axis by this curved portion, and the intermediate yoke and both casings are not displaced. The squareness between the rotary shaft and both casings will also be obtained.

Moreover, the outer end of the intermediate yoke is directly sandwiched between the pair of casings, and the sealant is reliably filled only in the closed space formed by the casing in which the step portion and the outer end portion are bent. Since there is no risk that the sealant will be sandwiched between flat plate materials and will flow into the motor or fall off as in the conventional case, in addition, due to variations in the coating amount and coating method, the intermediate yoke The axial position of does not vary.

In addition, the sealing between the casings is performed by only filling the sealing agent once in the closed space formed by the casing in which the step portion and the outer end portion are bent. , The number of times the sealant is applied is small,
Good workability in manufacturing.

Further, even if burrs or the like are formed on the cut outer end portion of the intermediate yoke, the burrs escape into the stepped portions and enter, so that there is no possibility of forming a gap between the plate materials and the coining treatment is performed. There is no need, and therefore, the flat motor is advantageous in terms of cost and can improve the manufacturing work efficiency.

(Embodiment) Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 is a half sectional view showing the structure of a flat motor according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing an essential part of FIG. 1, which is common to the members shown in FIGS. The same reference numerals are given to the members to be described, and the description thereof is partially omitted.

In the flat motor 20 according to one embodiment of the present invention shown in FIGS. 1 and 2, the casing 5 has an A bracket (corresponding to a casing) 5a and a B bracket (corresponding to a casing).
5b and bearings 6,6 mounted on each bracket 5a, 5b
The rotary shaft 4 of the rotor 3 is rotatably mounted by the.

A flat armature 2 is integrally formed on the rotor 3 by molding an armature coil together with a commutator 9 using synthetic resin.

On one side surface side of the armature 2, magnets 7 are arranged at predetermined intervals in the circumferential direction on the inner side surface of the A bracket 5a forming the casing 5. An intermediate yoke 8 is arranged on the other side surface of the armature 2 at a predetermined distance. The intermediate yoke 8 is made of a magnetic material, and the magnet 7
Is for returning the magnetic field lines passing through the armature toward the magnet 7 through the intermediate yoke 8.

The intermediate yoke 8 of this embodiment has an A bracket at its outer end.
It is directly sandwiched between the 5a and the B bracket 5b and fixed by caulking. A brush base 21 is attached to the side surface of the intermediate yoke 8, and a brush holder 22 for holding the brush 10 is attached to the brush base 21.

In particular, the end portion of the intermediate yoke 8 is, as shown in FIG.
The A bracket 5a is positioned radially inward from the outer end of the A bracket 5a by a dimension l, thereby forming a step D on the outer end of the intermediate yoke 8 in the radial direction. Then, the sealing agent S is loaded into the closed space formed by the step portion D and the casing 5b whose outer end portion is bent as described later,
A seal is provided between the brackets 5a and 5b.

With this configuration, when the outer end portion of one casing 5b is bent and the pair of casings 5a, 5b and the intermediate yoke 8 are caulked together, the intermediate yoke 8 and the other casing 5a One casing 5b in the step D between
The curved portion R of the rotating shaft 4 and the casings 5a, 5b of the rotating shaft 4 and the casings 5a, 5b of the casings 5a, 5b are not displaced by pushing the intermediate yoke 8 by the curved portion R.
The squareness with b will also come out. Moreover, the intermediate yoke 8
The outer end of the is directly sandwiched between the pair of casings 5a and 5b, and the sealing agent S is reliably filled only in the closed space formed by the stepped portion D and the casing 5b whose outer end is bent. Therefore, there is no risk that the sealant will be sandwiched between flat plate materials and flow into the motor or drop out as in the past.In addition, there is an intermediate due to variations in the coating amount and coating method. The position of the yoke 8 in the axial direction does not vary. Therefore, the intermediate yoke 8 and the rotor 3
Since a minute gap in the axial direction with is surely secured,
The motor torque can be improved, and the rotation operation of the motor becomes stable.

Also, when sealing between the casings 5, it is sufficient to fill the sealing agent S once into the closed space formed by the step portion D and the casing 5b whose outer end portion is bent. The number of times S is applied is small and workability is improved.

Further, even if burrs or the like are generated at the cut end of the intermediate yoke 8 during press molding, the burrs enter the stepped portion D, so that there is no possibility of forming a gap between the plate materials, and it is also necessary to perform the coining process described above. Absent. Therefore, the manufacturing work efficiency of the flat motor can be improved and the manufacturing cost can be reduced.

It should be noted that the present invention is not limited to the above-described embodiments, but can be variously modified within the scope of the present invention.

For example, without crimping the outer end of the A bracket 5a,
The B bracket 5b side may be fixed by crimping. In this case, the step portion D needs to be formed so as to occur between the intermediate yoke 8 and the B bracket 5b.

[Effects of the Invention] As described above, the flat motor according to the present invention is one in which the outer end portion of one casing is bent and the pair of casings and the intermediate yoke are caulked together. Since the step portion is formed radially outward of the outer end of the intermediate yoke between the intermediate yoke and the other casing, the curved portion of the outer end portion is inserted into the step portion. The possibility of the intermediate yoke being pushed in the direction perpendicular to the axis can be avoided, the intermediate yoke and both casings are not displaced, and the perpendicularity between the rotary shaft and both casings is also increased, resulting in extremely high mounting accuracy. .

Moreover, the outer end of the intermediate yoke is directly sandwiched between the pair of casings, and the sealant is reliably filled only in the closed space formed by the casing in which the step portion and the outer end portion are bent. Therefore, there is no risk that the sealant will be sandwiched between flat plate materials and flow into or drop out of the motor as in the conventional case. In addition, due to variations in coating amount and coating method, the intermediate yoke The axial position of does not vary. Therefore, since a minute gap in the axial direction between the intermediate yoke and the rotor is reliably ensured, the motor torque can be improved and the rotational operation of the motor becomes stable.

In addition, the sealing between the casings is performed by only filling the sealing agent once in the closed space formed by the casing in which the step portion and the outer end portion are bent. , Sealant applied less often,
Good workability in manufacturing.

Further, even if burrs or the like are formed on the cut outer end portion of the intermediate yoke, the burrs escape into the step portion and enter, so that there is no fear of forming a gap between the plate materials and the coining treatment is performed. There is no need, and therefore, the flat motor is advantageous in terms of cost and can improve the manufacturing work efficiency.

[Brief description of drawings]

FIG. 1 is a half sectional view showing a structure of a flat motor according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view showing an essential part of FIG. 1, and FIG. 3 is a structure of a conventional flat motor. And FIG. 4 is a sectional view showing the main part of FIG. 2 ... amateur, 3 ... rotor, 4 ... rotation axis, 5,5
a, 5b ... Casing, 7 ... Magnet, 8 ... Intermediate yoke, 20 ... Flat motor, D ... Step, S ... Sealant.

Claims (1)

(57) [Scope of utility model registration request] 1. A rotor (3) on which a flat ring-shaped armature (2) is formed, and a pair of middle-matching type casings (5a, 5b), each of which comprises a pair of casings (5a, 5b). By bending the outer end of one of the inner parts, the outer end of the other casing (5a) is caulked and fixed, and a casing (5) that rotatably supports the rotating shaft (4) of the rotor (3). A magnet (7) arranged in the casing (5a, 5b) so as to be located on one side surface side of the amateur (2)
And a middle yoke (8) arranged on the other side surface side of the amateur (2) and having an outer end sandwiched between the pair of casings (5a, 5b). The step (D) is formed radially outward of the outer end of the intermediate yoke (8) by locating the outer end of (8) radially inward of the outer end of the other casing (5a). And the outer end of the intermediate yoke (8) is directly sandwiched between the pair of casings (5a, 5b), and is formed by the step (D) and the casing (5b) in which the outer end is bent. A flat motor, characterized in that a sealing agent (S) is loaded in the closed space.