JP2003102137A - Rotor structure of motor and method for fixing rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress increase in manufacturing cost and facilitate work for mutually fixing an iron core and an iron core holding tool. SOLUTION: A rotor 35 comprises the iron core 33 fixed to an outer circumference of a spider 31 for fixing a rotary shaft 11. A stator 29 provided with a stator core 25 and a coil 27 is mounted on a motor housing 9 in an outer circumference of the rotor 35. A pin 43 is pressed into a pin insertion hole 33b, formed in the direction of the rotational shaft 11 in the vicinity of an insertion hole 33a for the iron core 33. The inside diameter of the insertion hole 33a for the iron core 33 is larger than the outside diameter of the spider 31. Since the pin 43 having a diameter larger than the inside diameter of the pin insertion hole 33b is pressed into the pin insertion hole 33b, the inner face of the insertion hole 33a protrudes toward the spider 31 and is transformed into a crimping part 33c. The crimping part 33c enters, presses and contacts a recess 39a which is formed on the surface of the spider 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention fixes an annular iron core, which is formed by laminating a plurality of magnetic materials along the axial direction of the rotating shaft, on the outer periphery of an iron core holder to which the rotating shaft is fixed. The present invention relates to a rotor structure of a motor and a rotor fixing method.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional rotor structure of a motor. The spider 3, which is an iron core holder fixed to the outer periphery of the rotating shaft 1, includes an inner tubular portion 3a, an outer tubular portion 3b, and a connecting portion 3c connecting the inner tubular portion 3a and the outer tubular portion 3b to each other. An iron core 5 formed by laminating a plurality of thin plates made of a magnetic material such as iron is fixed to the outer peripheral surface of the outer cylindrical portion 3b.

Conventionally, the iron core 5 is fixed to the spider 3 by heating the iron core 5 to expand it, inserting the spider 3 into the spider insertion hole 5a of the expanded iron core 5, and then cooling the iron core 5 to shrink it. , So-called shrink fitting.

[0004]

However, in the shrink fitting process, as described above, the iron core 5 is heated, the spider 3 is inserted into the heated iron core 5, and the iron core 5 is further cooled. , Causing an increase in manufacturing cost.

In order to solve this, the inner diameter of the spider insertion hole 5a of the iron core 5 is made slightly smaller than the outer diameter of the outer cylindrical portion 3b of the spider 3, and the spider 3 is press-fitted into the spider insertion hole 5a at room temperature. Can be considered. However, since the iron core 5 is formed by laminating a plurality of iron thin plates and the press-fitting distance of the spider 3 is long, there arises a problem that the thin plates of the iron core 5 are separated from each other during press-fitting.

For this reason, it is difficult to fix the iron core 5 and the spider 3 to each other while suppressing an increase in manufacturing cost.

Therefore, an object of the present invention is to facilitate the mutual fixing work of the iron core and the iron core holder while suppressing an increase in manufacturing cost.

[0008]

In order to achieve the above object, the invention of claim 1 is such that a plurality of magnetic materials are provided on the outer periphery of an iron core holder to which a rotating shaft is fixed, along the axial direction of the rotating shaft. In a rotor structure of a motor in which an iron core having an insertion hole into which the core holder is inserted is fixed, the iron core has an inner diameter larger than an outer diameter of the iron core holder. And a through hole penetrating in the axial direction of the rotary shaft, and a press-fitting member having a diameter larger than the diameter of the through-hole is press-fitted into the through-hole, and the press-fitting member presses the core of the iron core. A pressure contact portion is formed on the inner surface of the insertion hole so as to project and deform toward the iron core holder inserted into the insertion hole.

According to a second aspect of the invention, in the structure of the first aspect of the invention, the iron core holder has a structure in which a concave portion into which the pressure contact portion is inserted is formed in a surface portion corresponding to the pressure contact portion.

According to a third aspect of the invention, in the structure of the first or second aspect of the invention, the through hole of the iron core is a long hole that is long along the circumferential direction of the insertion hole of the iron core, and the press-fitting member is formed. The diameter is larger than the short diameter of the through hole constituted by the long hole.

According to a fourth aspect of the invention, a plurality of magnetic materials are laminated along the axial direction of the rotating shaft on the outer periphery of the iron core holder to which the rotating shaft is fixed, and the iron core holder is inserted. In a rotor fixing method of a motor in which an iron core having an insertion hole is fixed, the iron core holder is inserted into an insertion hole of the iron core having an inner diameter larger than an outer diameter of the iron core holder, The press-fitting member having a diameter larger than the diameter of the through-hole is press-fitted into the through-hole provided in the axial direction of the rotating shaft, and the press-fitting of the press-fitting member causes the inner surface portion of the insertion hole of the iron core to be This is a method for fixing the rotor of the motor in which the projecting deformation is made toward the iron core holder and pressure contact is performed.

According to a fifth aspect of the present invention, in the motor rotor fixing method according to the fourth aspect of the invention, the pressure contact portion that is deformed by projecting toward the iron core holder and pressure-contacts is a recess formed in the iron core holder. It's meant to get in.

According to a sixth aspect of the present invention, in the motor rotor fixing method according to the fourth or fifth aspect of the invention, the through hole of the iron core is a long hole that is long along the circumferential direction of the insertion hole of the iron core. The press-fitting member has a diameter larger than the short diameter of the through hole constituted by the long hole.

[0014]

According to the first or fourth aspect of the present invention, the inner surface portion of the through hole of the iron core is projected by the press-fitting member that is press-fitted into the through hole in a state where the iron core holder is inserted into the iron core insertion hole. Since the iron core holder is deformed and pressed into contact with the iron core holder, thereby fixing the iron core and the iron core holder to each other, it is not necessary to press the iron core holder into the insertion hole of the iron core. It is possible to prevent the thin plate from peeling off, and it is possible to easily perform the mutual fixing work between the iron core and the iron core holder while suppressing the manufacturing cost by eliminating the work steps such as heating and cooling the iron core.

According to the second or fifth aspect of the present invention, the pressure contact portion of the iron core is inserted into the concave portion of the iron core holder, so that the iron core and the iron core holder are more securely fixed to each other.

According to the invention of claim 3 or 6, when the press-fitting member is press-fitted into the through-hole, the inner surface portion of the insertion hole of the iron core is easily deformed, so that the iron core and the iron-core holder are securely fixed to each other. Can be done.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a motor having a rotor structure for a motor according to an embodiment of the present invention. The motor housing 9 includes a rotating shaft 11 and two bearings 1
Left and right end plates 17, which are rotatably supported by 3, 15
19 and a cylindrical tubular body 21 fixed to the outer peripheral portion of each of the end plates 17 and 19. A cooling water passage 23 is formed at the center of the cylindrical body 21 in the axial direction.

On the inner wall of the cylindrical body 21 at the portion provided with the cooling water flow path 23, a stator 29 composed of an annular stator core 25 and a coil 27 attached to the stator core 25 is mounted.

Inside the stator 29 described above,
A rotor 35 including a spider 31 as an iron core holder fixed to the rotary shaft 11 and an annular iron core 33 fixed to the outer peripheral portion of the spider 31 is arranged.

The spider 31 is made of a magnetic material such as iron, and has an inner cylindrical portion 37 into which the rotating shaft 11 is inserted and fixed, and an outer cylindrical portion 39 to which the iron core 33 is fixed at the outer peripheral portion. The inner cylinder part 37 and the outer cylinder part 39 are provided.
Are connected to each other at an axially central connecting portion 41. The spider 31 is inserted and fixed in the insertion hole 33a of the iron core 33 described above.

The iron core 33 is a thin plate (for example, a plate thickness of 0.5 mm) made of a magnetic material such as iron as in the conventional core.
A plurality of layers) are laminated along the axial direction of the rotating shaft 11. Although not shown, a plurality of magnet insertion holes, into which permanent magnets extending in the axial direction of the rotary shaft 11 are inserted and fixed, are formed on the outer peripheral side of the iron core 33 in the circumferential direction.

In the above-mentioned iron core 33, a pin insertion hole 33b as a through hole penetrating in the axial direction of the rotating shaft 11 is provided near the insertion hole 33a, for example, 4 along the circumferential direction.
One is provided. The number of the pin insertion holes 33b is not limited to four. A pin 43 as a press-fitting member is press-fitted into the pin insertion hole 33b from the right side in FIG. The pin 43 is provided with a tapered portion 43a having a tapered tip portion and a head portion 43b at a base end portion.

Next, referring to FIG. 2, the spider 31 and the iron core 33 before the pin 43 is press-fitted into the pin insertion hole 33b.
The shape of will be described. FIG. 2 omits a part of the AA sectional view of FIG. 1 in a state before the pin 43 is press-fitted into the pin insertion hole 33b.

The insertion hole 33a of the iron core 33 is provided in the spider 31.
Is formed to be larger than the outer diameter of the outer tubular portion 39, that is,
A gap S indicated by the dimension t ₁ is formed between them.
On the surface of the outer cylinder portion 39 of the spider 31 corresponding to the through hole 33b, a curved concave portion 39a having a depth t ₂ is formed along the axial direction of the rotating shaft 11. here,
The radius of the pin 43 is larger than the radius of the pin insertion hole 33b by (t
₁ + t ₂ ) or more.

Next, referring to FIG. 3, the spider 31 and the iron core 33 after the pin 43 is press-fitted into the pin insertion hole 33b.
The shape of will be described. FIG. 3 omits a part of the AA cross-sectional view of FIG. 1 in a state after the pin 43 is press-fitted into the pin insertion hole 33b.

As shown in FIG. 2, the spider 31 is first inserted into the insertion hole 33a of the iron core 33. At this time, the inner diameter of the insertion hole 33a is formed larger than the outer diameter of the spider 31. , It is not necessary to press the spider 31 into the insertion hole 33a, so that the iron core 3
The thin plate of No. 3 can be easily inserted without peeling.

When the pin 43 is press-fitted into the pin insertion hole 33b with the spider 31 inserted in the insertion hole 33a of the iron core 33, the inner surface portion of the insertion hole 33a of the iron core 33 is in the state shown by the chain double-dashed line in FIG. From the above, it is projected and deformed toward the spider 31 so as to be in the state shown by the solid line, becomes the pressure contact portion 33c, and enters the recess 39a of the outer cylindrical portion 39 of the spider 31 and is pressure contacted. By this pressure contact, the iron core 33 and the spider 31 are fixed to each other.

At this time, by forming the pin insertion hole 33b as a long hole along the circumferential direction of the insertion hole 33a of the iron core 33, as shown by the chain double-dashed line in FIG. This facilitates the fixation of the iron core 33 and the spider 31 to each other, and the rotational torque of the iron core 33 when the motor is operating can be reliably transmitted to the spider 31, and a highly reliable motor can be obtained.

According to the above-mentioned method of fixing the spider 31 to the iron core 33, an increase in manufacturing cost is suppressed by eliminating the need for working steps such as heating and cooling the iron core 33. Fixing work of iron core 33
It can be easily performed without peeling of the thin plate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a motor having a motor rotor structure showing an embodiment of the present invention.

2 is a view of FIG. 1A in which a part of the rotor structure of the motor of FIG. 1 before the pin is press-fitted into a pin insertion hole is omitted.
FIG.

FIG. 3A of FIG. 1 in which a part of the rotor structure of the motor of FIG. 1 after the pin is press-fitted into a pin insertion hole is omitted.
FIG.

FIG. 4 is a cross-sectional view of a motor having a rotor structure of a motor showing a conventional example.

[Explanation of symbols]

11 rotation axis 31 Spider (iron core holder) 33 iron core 33a insertion hole 33b Pin insertion hole (through hole) 33c Pressure contact part 39a recess

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5H002 AA07 AA08 AB09 AC03 AC06                 5H615 AA01 BB01 BB05 BB14 PP02                       PP06 PP24 SS05 SS09 SS19                       SS20

Claims (6)

[Claims] 1. An insertion hole, into which an iron core holder is inserted, which is formed by laminating a plurality of magnetic materials along an axial direction of the rotation shaft, on an outer periphery of the iron core holder to which the rotation shaft is fixed. In the rotor structure of the motor in which the iron core is fixed, the iron core has a through hole penetrating in the axial direction of the rotating shaft while the insertion hole has an inner diameter larger than the outer diameter of the iron core holder. A press-fitting member having a diameter larger than the diameter of the through-hole is press-fitted into the through-hole, and the press-fitting member press-fits the inner surface portion of the insertion hole of the iron core into the iron core holder to be inserted into the insertion hole. A rotor structure for a motor, characterized in that a press contact portion is formed that is projected and deformed toward the press contact. 2. The rotor structure for a motor according to claim 1, wherein the iron core holder has a recessed portion into which the pressure contact portion is inserted, in a surface portion corresponding to the pressure contact portion. 3. The through hole of the iron core is a long hole that is long along the circumferential direction of the insertion hole of the iron core, and the press-fitting member is larger than the short diameter of the through hole formed of the long hole. The rotor structure for a motor according to claim 1 or 2, wherein the rotor structure has a diameter. 4. An insertion hole, in which a plurality of magnetic materials are laminated along the axial direction of the rotating shaft, is formed on the outer periphery of the iron core holder to which the rotating shaft is fixed, and in which the iron core holder is inserted. In a method for fixing a rotor of a motor in which an iron core is fixed, the iron core holder is inserted into an insertion hole of the iron core having an inner diameter larger than an outer diameter of the iron core holder, and the iron core holder is mounted on the iron core to rotate the iron core. In the through hole that penetrates in the axial direction of the shaft,
A press-fitting member having a diameter larger than the diameter of the through hole is press-fitted, and by press-fitting the press-fitting member, the inner surface portion of the insertion hole of the iron core is deformed so as to project toward the iron core holder and press-contacted. Method for fixing rotor of motor. 5. The method for fixing a rotor of a motor according to claim 4, wherein the press-contact portion projectingly deformed and pressed against the iron core holder is inserted into a recess formed in the iron core holder. 6. The through hole of the iron core is a long hole that is long along the circumferential direction of the insertion hole of the iron core, and the press-fitting member is larger than the short diameter of the through hole formed of the long hole. The method for fixing a rotor of a motor according to claim 4 or 5, wherein the method has a diameter.