JPS60152257A - Manufacture of rotor of rotary electric machine - Google Patents

Abstract

PURPOSE:To reliably secure a rotor and a shaft by foring a cutout on the peripheral edge of a shaft inserting hole of a rotor punching plate, inserting a shaft into the shaft inserting hole, and then pressure-contacting the inner periphery of the hole with the shaft. CONSTITUTION:A plurality of cutouts 5 are formed on the peripheral edge of a shaft inserting hole formed at the center of a rotor punching plate 2, the edge is bent to increase the bore of the hole larger than the outer diameter of a shaft 7. After the shaft 7 is inserted into the hole, the edge of the hole is pressurized and recovered in the direction reverse to the bending direction by a retainer 11 and a pressing jig 10, and the edge of the hole is pressure-contacted with the shaft 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of manufacturing a rotor for a rotating electric machine, which improves the method of fixing a shaft to a rotor.

[Technical background of the invention and its problems]

Conventionally, the following two types of manufacturing methods have been implemented for this type of rotor. That is, (1) loosely inserting a shaft having approximately the same diameter as the shaft insertion hole into the shaft insertion hole of a rotor in which a large number of rotor punched plates are stacked;
After that, strong local pressure is applied to the periphery of the shaft insertion hole of the rotor from both sides of the rotor to deform the shaft insertion hole of the rotor punched inward, and this deformation causes the inner periphery of the rotor punched to become a shaft. The rotor and shaft are firmly attached to each other by pressure contact.

However, in the above method, the rotor punching in which the shaft insertion hole deforms inward is limited to one or two rotor plates from both ends of the rotor, and the rotor punching in the center does not deform and does not come into pressure contact with the shaft, so the rotor There is a problem that the fixing force between the shaft and the shaft is insufficient, resulting in a lack of reliability.

(2) Press-fit the shaft, whose surface has been knurled so that it has sufficient interference with the shaft insertion hole, into the shaft insertion hole of the rotor, which has a large number of laminated rotor blanks, and then insert the shaft into the rotor. is fixed.

However, in the above method, since the end of the shaft is pressurized when the shaft is press-fitted into the shaft insertion hole of the rotor, there is a problem that the shaft may bend and deform in the case of a small diameter shaft or a long shaft. There is.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a method for manufacturing a rotor for a rotating electrical machine that can reliably fix the rotor and shaft and also reliably prevent the shaft from bending and deforming. It is in.

[Summary of the invention]

The present invention includes forming a plurality of notches at the peripheral edge of a shaft insertion hole formed in the center of a rotor blank, and bending the peripheral edge of the shaft insertion hole divided into a plurality of parts by the notches. a step of forming the inner diameter of the shaft insertion hole to be larger than the shaft to be inserted into the shaft insertion hole, and a peripheral edge of the shaft insertion hole after inserting the shaft into the shaft insertion hole made larger in diameter by the step; the shaft in a direction opposite to the bending direction by the bending process to bring the inner peripheral part of the shaft insertion hole into pressure contact with the shaft, and the shaft is inserted into the shaft insertion hole having a diameter larger than the outer diameter of the shaft. After that, the peripheral part of the shaft insertion hole is pressurized and restored, and the inner peripheral part thereof is brought into pressure contact with the shaft, thereby fixing the rotor and the shaft.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

First, in FIG. 1, reference numeral 1 denotes a rotor, which is made up of a stack of rotor blanks 2, which are connected to each other through slots 5 formed on both sides of the outer periphery of the rotor blanks 2. An electrically conductive end ring 4.4 is formed. Reference numeral 5 denotes a shaft insertion hole formed in the center of the rotor punched plate 2, and on the periphery of this shaft insertion hole 5, multiple notches 6, for example, three notches, continuous with the shaft insertion hole 5, are formed at equal intervals. has been done. A shaft 7 is inserted and fixed into the shaft insertion hole 5 as described later.

Next, a method for inserting and fixing the shaft 7 into the rotor 1 will be explained.

(1) First, the circumferential edge of the shaft insertion hole 5 of the rotor punched plate 2 is bent as a circular arc portion 8 that is concentric with the shaft insertion hole 5 and passes through the bottom of the notch 6, as shown by the two-dot chain line in FIG. It is bent into a tapered shape to form three fan-shaped bent portions 9, thereby making the inner diameter of the insertion hole 5 larger than the outer diameter B of the shaft 7. Incidentally, the shaft insertion hole 5 is formed by punching at the same time as the notch 6, but its inner diameter is set in advance to be smaller than the outer diameter B of the shaft 7, and the above-mentioned bent part 9 is formed. This expands the diameter and makes the inner diameter dimension A.

(2) The rotor 1 is formed by stacking a large number of rotor blanks 2 (see FIG. 4).

(3) The shaft 7 is inserted into the shaft insertion hole 5 of this rotor 1.
(See Figure 5).

(4) A cylindrical pressure jig 10 is applied to the tip of the bent portion 9 of the rotor 1, and the opposite side of the rotor 1 is received by the cylindrical receiver 11 (see FIG. 5).

(5) Then, the pressurized oil A10 is moved in the direction of arrow C, and the rotor 1 is compressed by cooperation with the receiver 11.

As a result, as shown in FIG. 1, the bent portion 9 is restored to a substantially flat state over the entire width of the laminated layer of the rotor 1, and stability can be ensured over the entire laminated thickness of the rotor 1.

According to the above embodiment, since the diameter is made larger than the circumferential edge of the shaft insertion hole 5, there is no need to press fit the shaft 7 when inserting it, and it is possible to reliably prevent the shaft 7 from being bent or deformed. In addition, the bending portion 9 can be restored over the entire laminated thickness of the rotor punched plate 2 by the pressing jig 10 and the receiver 11, and the inner edge of the shaft insertion hole 5 of each rotor punched plate 2 is pressed against all the shafts 7. Therefore, the rotor 7 and the shaft 7 can be securely fixed.

〔Effect of the invention〕

As is clear from the above description, the present invention has a plurality of notches formed at the peripheral edge of a shaft insertion hole formed in the center of a rotor blank, and the shaft insertion hole is divided into a plurality of parts by the notches. a step of bending the peripheral edge of the hole to form the inner diameter of the shaft insertion hole to be larger than the shaft inserted into the shaft insertion hole; and inserting the shaft into the shaft insertion hole made larger in diameter by the step. After that, the peripheral edge of the shaft insertion hole is pressed and restored in the direction opposite to the bending direction by the bending process, and the inner peripheral part of the shaft insertion hole is brought into pressure contact with the shaft, thereby preventing the shaft from bending. This has the effect that deformation can be reliably prevented and the rotor and shaft can be reliably fixed over the entire laminated thickness of the rotor.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal side view, FIG. 2 is a longitudinal side view of rotor punching, FIG. 6 is a perspective view of rotor punching, and FIGS. The figure is a longitudinal side view showing the manufacturing process of p-yu. In the drawings, 1 is a rotor, 2 is a rotor punched out, 5 is a shaft insertion hole, 6 is a notch, 7 is a shaft, 10 is a pressure jig, 1
1 indicates a receiver. Applicant Tokyo Shibaura Electric Co., Ltd. Figure 1 s 2 Zutoku 4 Figure 5

Claims (1)

[Claims] 1. In a rotor formed by laminating a large number of rotor blanks, a plurality of notches are formed at the peripheral edge of a shaft insertion hole formed in the center of the rotor blank, and the rotor is divided into a plurality of parts by the notches. a step of bending the peripheral edge of the shaft insertion hole to make the inner diameter of the shaft insertion hole larger than that of the shaft to be inserted into the shaft insertion hole; and a shaft insertion hole made larger in diameter by the step; a rotor for a rotating electrical machine, the process comprising the step of: inserting a shaft into the shaft, and then restoring the circumferential edge of the shaft insertion hole by applying pressure in a direction opposite to the bending direction by the bending process, and bringing the inner circumference of the shaft insertion hole into pressure contact with the shaft; Production method.