JPH0442755A - Armature and manufacture thereof in electric rotary machine - Google Patents

Abstract

PURPOSE:To facilitate building of a commutator part so as to ensure adhesive strength by forming a core part corresponding location left as a non-polished part and a commutator part corresponding location as a polished part, which is provided with a shaft diameter almost equal to or a little larger than the initial diameter of an armature shaft, of knurled parts. CONSTITUTION:An armature shaft 2 is knurled in part corresponding to a core 3 and a commutator 4. This knurled part 2a has a diameter (at ridges) of d2(d1<d2) larger than a location not machined. Of the knurled part 2a, a location corresponding to the core 3 is left as it is, and a location in a point end side, where a commutator 4 is inserted, is polished such that the diameter d3 (at ridges) satisfies a relation of d1<=d3<d2, i.e., almost equal to or a little larger than the shaft diameter d1 of an armature shaft. The core 3 is formed by press-fitting a core material, in which thin plates are laminated, to a non- polished part 2b through a polished part 2c, and then the commutator 4 is adhesively inserted to the polished part 2c.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an armature in a rotating electrical machine such as a motor or a generator, and a method for manufacturing the armature.

[Prior Art and Problems to be Solved by the Invention] -Jj, the armature of this type of rotating electric machine is manufactured by press-fitting the core part and the commutator part into the core shaft.

For this reason, conventionally, a portion approximately equivalent to the core member is knurled (or knurled) in the axial direction on the outer periphery of the core shaft material.
Attempts have also been made to press-fit thin plate-like core materials to the outside in a laminated manner and press-fit the commutator section into a flat surface without knurling. However, since the knurling length of this product is short and only corresponds to the core part, alignment during knurling by rolling is difficult, and depending on the variation in the core shaft diameter, it may be difficult to press fit the commutator part. The problem is that it is difficult to mass-produce high-quality armatures because they can be too loose or too hard.

Therefore, a long knurling process is applied to the core shaft in the axial direction to correspond to the core part and the commutator part to improve the alignment accuracy of the knurling process, and the core part and the commutator part are press-fitted into the long knurling part. I was trying to do that. However, if you do this, the press-fitting stroke of the core will become too long, and when the core is press-fitted, the length of the remaining part of the core shaft that has not been knurled will be short. It is difficult to align the axis of the core part with the axis of the core shaft, and as a result, a so-called galling phenomenon occurs when the core part is press-fitted, and the press-fitting operation cannot be performed smoothly and reliably. When bonding the shaft and the inner circumferential surface of the commutator part, greater adhesive strength can be obtained if the bonding surfaces are close to each other and have curved contact, but when knurling is applied, The portion close to the surface is the peak of the chevron, and is almost in line contact, which creates a new problem in that it is difficult to obtain the desired adhesive strength.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing an armature for a rotating electrical machine and a method for manufacturing the same that can eliminate these drawbacks.

The method for manufacturing an armature in a rotating electric machine is to press-fit a core part formed by laminating thin plates onto a core shaft and a commutator part. A long knurling process is performed in the axial direction corresponding to the core part and the commutator part, and then, among the knurling parts, the part corresponding to the core part is left as a non-polished part, and the part corresponding to the commutator part is processed using a grindstone. The chevron formed by the knurling process is polished to create a polished portion that has a shaft diameter that is approximately the same as or slightly larger than the original diameter of the core shaft, and the stepped portion between the polished portion and the non-polished portion is polished. After chamfering, the core part is press-fitted into the non-polished part through the polished part, and the commutator part is press-fitted into the polished part.

In addition, as an armature for a rotating electrical machine, an insulator armature is formed by press-fitting a core part formed by laminating thin plates onto a core shaft and a commutator part, and the core part corresponds to the core part of the outer periphery of the core shaft. The part was left knurled, and the part corresponding to the commutator part was knurled, but the chevron part was polished so that it had a diameter that was approximately the same as or slightly larger than that of the core shaft, and then the knurling process was performed as described above. The present invention is characterized in that the stepped portion between the unpolished portion and the polished portion is chamfered.

According to the present invention, although the knurled portion is elongated in the axial direction, the commutator portion can be easily press-fitted and sufficient adhesive strength can be ensured.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, 1 is an armature of a motor, and the armature 1 is composed of a core shaft 2, a core part 3 formed by laminating a large number of thin plate materials, a commutator part 4, and other member devices. The armature 1 is assembled in the following manner, although it is the same as before.

In other words, the core shaft 2 is constructed using a cylindrical material having the same shaft diameter d, but there is a cylindrical material on the outer peripheral surface of this material over an axial length sufficient to accommodate the core portion 3 and the commutator portion 4. Knurling is performed by rolling, and the knurling portion 2a has a shaft diameter (outer diameter of the peak portion) d2 (d□<d2) that is larger than the portion that is not processed.

Of the knurled part 2a, the part corresponding to the core part 3 is left as is, and the part on the tip side into which the commutator part 4 is press-fitted is rolled using a grindstone 5, so that the shaft diameter (
The outer diameter of the ridge) d3 is almost equal to or slightly larger than the shaft diameter d□ of the core shaft (d work≦d, < d
z), thereby converting the knurled part 2a into a non-polished part 2b which is not polished.
c and into a stepped portion 2d, and the stepped portion 2d is set at an angle θ.
Chamfer so that

After the polished portion 2c and non-polished portion 2b are formed on the core shaft 2 in this manner, the core portion material made of laminated thin plates is press-fitted into the non-polished portion 2b through the polished portion 2c to form the core portion 3. Then, the armature 1 is formed by press-fitting the commutator part 4 into the polishing part 2c, and then performing necessary post-work such as winding a coil around the core part 3.

In this way, in the present invention, the knurled part 2a is formed on the core shaft 2 together with the part corresponding to the core part 3 and in the long range in the axial direction corresponding to the commutator part 4. The axis of machining can be aligned with the core axis 2 with high precision.

Moreover, as mentioned above, the long knurled part 2a is formed by polishing the part where the commutator part 4 is press-fitted until the shaft diameter becomes approximately the original diameter, leaving the part corresponding to the core part 2 as it is, and forming the polished part 2c. In order to form the core part 3, the press-fitting stroke is substantially reduced to only the non-polished part 2b.
It never gets too long. Moreover, when press-fitting into the non-polished part 2b, the core part 3 can be stably set because the polished part 2c is long. The non-polished part 2b is guided to the precisely chamfered stepped part 2d between the
It can be press-fitted into the core, and the core can be assembled in a precisely aligned manner without galling.

On the other hand, the commutator part 4 is press-fitted into the polishing part 2c, and in the polishing part 2c, the chevron-shaped top of the knurling part is polished to form an arc-shaped peripheral surface, which forms the inner peripheral surface of the commutator part 4. Closely confront. For this reason, the inner peripheral surface of the commutator part 4 comes into contact with the inner surface of the commutator part 4 and is bonded with an adhesive, resulting in a stronger adhesive strength compared to conventional non-polished products. can.

[Operation and Effect] In summary, since the present invention is constructed as described above, the core shaft is knurled over a long range in the axial direction corresponding to the core part and the commutator part. Therefore, the axis of knurling can be aligned with the core axis with high accuracy.

Moreover, this long knurling part is a polished part where the part corresponding to the core part is left as is, and the part corresponding to the commutator part is polished until the shaft diameter becomes approximately the original diameter of the core shaft.As a result, the press-fitting stroke of the core part Substantially, only the non-polished portion is required, and it does not become long. Moreover, when press-fitting into the non-polished part, the core part can be stably set because it passes through a long polished part, and this stably set core part is polished between the non-polished part and the polished part to achieve precision. The core part can be press-fitted into the non-polished part by being guided by the well-chamfered stepped part, and the core part can be assembled in a precisely aligned manner without galling.

Furthermore, the polishing part into which the commutator part is press-fitted is
The chevron-shaped top portion of the knurled portion is polished to form an arcuate circumferential surface, which closely opposes the inner circumferential surface of the commutator portion 4. As a result, the inner circumferential surface of the commutator part comes into contact with the inner circumferential surface of the commutator and is bonded using an adhesive, resulting in stronger bonding strength compared to conventional non-polished products, resulting in high strength and reliability. It can be made to have a high value.

[Brief explanation of the drawing]

The drawings show an embodiment of an armature in a rotating electric machine and a method for manufacturing the same according to the present invention.
2 is a side view of the core shaft, FIG. 3 is an explanatory diagram showing the procedure for assembling the armature, and FIG. 4 is a front sectional view of the polishing part. FIG. 5 is an enlarged cross-sectional view of the main part of the polishing section, and FIG. 6 is an enlarged side cross-section of the main part of the polishing part. In the figure, l is the armature, 2 is the core shaft, 2a is the rotary part, 2b is the unpolished part, 2C is the cut part, 2d is the stepped part,
3 is a core part, 4 is a commutator part, and 5 is a grindstone. Figure 3

Claims (1)

[Claims] 1) To manufacture an armature by press-fitting a core part formed by laminating thin plates onto a core shaft and a commutator part, first, the core part and a commutator part are placed around the outer periphery of a core shaft having the same shaft diameter. Then, among the knurled parts, the part corresponding to the core part is left as a non-polished part, and the part corresponding to the commutator part is subjected to the knurling process using a grindstone. The chevron formed by is polished to create a polished portion that has a shaft diameter that is approximately the same as or slightly larger than the original shaft diameter of the core shaft, and the stepped portion between the polished portion and the non-polished portion is chamfered. After that, the core part is press-fitted into the non-polished part through the polished part, and the commutator part is press-fitted into the polished part. 2) In an armature of a rotating electric machine that is formed by press-fitting a core part formed by laminating thin plates onto a core shaft and a commutator part, the portion of the outer periphery of the core shaft that corresponds to the core part is knurled. The part corresponding to the commutator part is knurled, but the chevron part is polished so that it has a diameter that is approximately the same as or slightly larger than that of the core shaft. An armature for a rotating electrical machine, characterized in that a stepped portion between the part and the polished part is chamfered.