JPS6011739Y2 - Press fitting device for rotor shaft - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a device for pressing a rotor shaft against a rotor core of a motor or the like.

Conventionally, in order to press fit a rotor shaft into a rotor core, as shown in FIG.
After arranging the through hole 5 of the rotor core 2 on the same line, the punch 6 hangs down from the upper part and the rotor shaft 1 is press-fitted into the rotor core 2 on the dia while holding the upper end of the rotor shaft 1.

However, since the rotor core 2 is generally formed by laminating thin plates punched with a press, if the lamination is not done accurately, the through hole 5 of the rotor core 2 and the end surface will not be at right angles, and the rotor When the shaft 1 was press-fitted, there was a risk that the rotor shaft 1 would be bent as shown in FIG.

Furthermore, the same phenomenon as described above may occur even when the end surface of the rotor core 2 is not flat as shown in FIG.

The present invention eliminates such difficulties, and the rotor core 2
Even if the end face of the rotor and the through hole 5 are not perpendicular to each other, the rotor shaft 1 can be press-fitted without bending the rotor shaft 1.

In the present invention, the punch 6 is no different from the conventional example, and a bottomed hole 8 having an inner diameter corresponding to the outer diameter of the rotor shaft 1 is bored in the tip surface of the punch 6.

The feature of the present invention is the structure of the die, and examples of the die will be described in detail below.

In FIG. 3, reference numeral 12 includes a holding plate 9' having a spherical bearing 9 fitted at its upper end, and a through hole 11 at its lower end for sliding a positioning rod 10 that supports the lower end of the rotor shaft 1. It is a die support stand formed by drilling, and is fixedly installed on a base 14 in which a through hole 13 is formed.

A through hole 15 having a diameter sufficiently larger than the outer diameter of the rotor shaft 1 is bored in the center of the spherical bearing 9, and a die 17 having a flange 16 formed on the upper part thereof is fitted.

In order to press fit the rotor shaft 1 into the through hole 5 of the rotor core 2 according to the present invention, first, as in the conventional example, the rotor shaft 1 and the rotor core 2 are brought by the robot hands 3 and 4, respectively, and the rotor shaft 1 and the rotor core After the two through holes 5 are arranged on the same line, the punch 6 hangs down.

When the punch 6 hangs down, the upper part of the rotor shaft 1 is inserted into the bottomed hole 8 formed in the punch 6, and as the punch 6 continues to hang down, the lower end of the rotor shaft 1 touches the upper end of the through hole 5 of the rotor core 2. come into contact with

Since the rotor shaft 1 and the through hole 5 are in a tight fit relationship,
If the rotor shaft 1 just contacts the through hole 5, it is not inserted, and the punch 6, rotor shaft 1, and rotor core 2
hangs integrally over the die 17.

After the rotor core 2 is placed on the die 17, the punch 6
When the rotor shaft 1 hangs down, the rotor shaft 1 is slightly press-fitted into the through hole 5.

At this time, if the lower end surface of the rotor core 2 and the through hole 5 are not perpendicular to each other, when the rotor shaft 1 receives a pressing force in the vertical direction from the punch 6, the through hole 5 will also move vertically along the rotor shaft 1 as shown in FIG. It is pressed in the direction.

Therefore, the lower end surface of the rotor core 2 is not horizontal, and the through hole 5
However, since the die 17 is held by the goo support 12 via the spherical bearing 9, the lower end surface of the rotor core 2 can be easily tilted.

When the punch 6 further hangs down, the rotor core 2 slides on the upper end surface of the die 17 in the direction of the arrow 18 by the amount of eccentricity of the through hole 5, and the rotor shaft 1 is press-fitted therein.

Note that the amount of press-fitting can be set constant using the positioning rod 10 for controlling the amount of press-fitting.

Therefore, even if the end surface of the rotor core 2 and the through hole 5 are not at right angles, or even if the end surface of the rotor core 2 is not flat, the rotor shaft 1
is press-fitted without bending.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the process of press-fitting the rotor shaft using a conventional device, Fig. 2 is a cross-sectional view showing the rotor shaft in a bent state, and Fig. 3 is a cross-sectional view showing the gouge part in an embodiment of the present invention. , Fig. 4 is a cross-sectional view showing a state in which the rotor shaft is press-fitted according to an embodiment of the present invention, Fig. 5 is a cross-sectional view showing the rotor core whose lower end surface is flat (Fig. 2 is a rotor core, 1 is a rotor shaft, 6 is a punch, 8 is a bottomed hole, 15 is a through hole, 17 is a guide, 9 is a spherical bearing, and 10 is a positioning frame.

Claims (1)

[Scope of utility model registration request] In a device for press-fitting the rotor shaft of a rotor core, a bottomed hole with an inner diameter corresponding to the outer diameter of the rotor shaft is bored on the tip surface of the punch, and a hole with a bottom that is larger than the outer diameter of the rotor shaft is formed in the center opposite to the tip surface of the punch. A press-fit device for a rotor shaft, in which a die with a large diameter through hole is held against a base via a spherical bearing.