JPWO2013054438A1 - Rotating electrical machine rotor - Google Patents

Abstract

In a rotor of a rotating electrical machine that is configured by press-fitting a shaft (2) into a through hole provided in the laminated core (3), a protrusion that fits on the outer peripheral surface of the shaft (2) with the inner wall of the through hole. The laminated core (3) is divided into stacked core portions (3b, 3c) having a predetermined interval in the axial direction, and the circumferential direction of each stacked core portion (3b, 3c) is formed. A relief groove (3a) that does not fit with the protrusion (2a) was formed on the inner wall.

Description

  The present invention relates to a rotor of a rotating electrical machine, and more particularly to a fitting structure between a laminated core of a rotor of a rotating electrical machine and a shaft in an electrical motor or the like.

  In general, a laminated core of a rotor used for an electric motor or a generator is formed by punching and stacking and caulking metal plates such as silicon steel plates and electric mild steel plates. Thereafter, the rotor is completed by press-fitting a shaft into the laminated core formed in this way and inserting a magnet or winding.

An example of such a rotor structure of a rotating electrical machine is disclosed in Patent Document 1.
In Patent Document 1, four projecting ridges extending in the axial direction are arranged at equal intervals in the circumferential direction at a portion where the laminated core on the outer peripheral surface of the shaft is fixed. The outer diameter of the shaft that does not include the protruding portion is formed slightly smaller than the inner diameter of the laminated core, the outer diameter of the shaft that includes the protruding portion is formed slightly larger than the inner diameter of the laminated core, and the protruding portion is 2 It is divided by two dividing grooves.

Another conventional example is disclosed in Patent Document 2. As shown in FIG. 3, a protrusion 2a is provided on the fitting surface of the rotating shaft 2 with the rotor core 3 so as to be substantially even in the axial direction, as shown in FIG. The positions in the circumferential direction are different from each other. With this configuration, when the rotor core 3 is press-fitted into the rotating shaft 2, the protrusions bite into the new part of the rotor core 3 on the opposite side of the press-fitting, and there is no wear of the biting grooves, so that the rotor core engages with the rotor core. However, since the portions where the protrusions are formed are distributed almost uniformly in the axial direction, the rotating shaft 2 and the rotor core 3 can be obtained with a strong fitting force in a well-balanced manner.

JP 2004-343970 A Japanese Utility Model Publication No. 57-47840

  In the conventional structure as described above, the ridges that are initially pressed into the laminated core are pressed into the entire length of the laminated core so that the ridges are crushed. Therefore, when the press-fitting length is long, there is a problem in that the bonding force with the laminated core is greatly reduced.

  The present invention has been made to solve the above-described problems, and suppresses shaft runout without causing special equipment, processing, and an increase in the number of parts, and the sufficient relationship between the laminated core and the shaft. An object of the present invention is to provide a rotor for a rotating electrical machine having a proper fitting force.

The rotor of the rotating electrical machine according to the present invention is the rotor of the rotating electrical machine configured such that the shaft is press-fitted into the through hole provided in the central portion of the laminated core. An axially extending ridge that fits with the inner wall is formed, and the laminated core is divided into stacked core portions with a predetermined interval in the axial direction, and the penetrations for each of the divided stacked core portions In the circumferential inner wall of the hole, an escape groove that does not fit with the protruding portion is formed.

  Moreover, the position of the escape groove formed for each of the thick core portions is formed at a position different from the escape grooves of the other thick core portions in the circumferential direction.

  According to the rotor of the rotating electrical machine of the present invention, the shaft vibration of the rotating electrical machine having a sufficient fitting force between the laminated core and the shaft is suppressed without causing special equipment, processing, and an increase in the number of parts. A rotor can be obtained.

    The above-described and other objects, features, and effects of the present invention will become more apparent from the detailed description and the drawings in the following embodiments.

FIG. 3 is a side sectional view showing the configuration of the rotor of the rotary electric machine according to Embodiment 1 of the present invention. It is sectional drawing which follows the BB line and CC line of FIG. It is a sectional side view which shows an example of the rotor of the conventional rotary electric machine.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described in detail below with reference to the drawings. In addition, in each figure, the same code | symbol shall show the same or an equivalent part.
FIG. 1 is a side sectional view showing a schematic configuration of the rotor of the rotating electric machine according to the first embodiment, and FIG. 2 is a sectional view taken along lines BB and CC in FIG.
1 and 2, the rotor is press-fitted with a shaft 2 into a laminated core 3 and is fitted by a protrusion 2a. A magnet (not shown) is disposed on the laminated core 3.

The laminated core 3 is formed with a relief groove 3a of a ridge portion 2a formed on the outer peripheral surface of the shaft 2 on the inner peripheral surface. When the shaft 2 is press-fitted into the through hole of the laminated core 3, the laminated core 3 is laminated. The inner peripheral surface of the core 3 is not fitted to the entire outer peripheral surface of the shaft 2.
That is, the laminated core 3 is divided into stacked core portions 3b and 3c having a predetermined interval (that is, a predetermined length) in the axial direction, and for each stacked core portion 3b and 3c, An escape groove 3a that does not fit with the protrusion 2a is formed.
As is apparent from FIG. 2, the escape groove 3a formed in the stacked core portion 3b and the escape groove 3a formed in the stacked core portion 3c are configured to be different from each other in the circumferential direction. Has been.

  The outer diameter of the shaft 2 including the protruding portion 2 a is formed to be slightly larger than the inner diameter of the laminated core 3. The outer diameter of the shaft 2 that does not include the protrusions 2a is set to be equal to or slightly smaller than the inner diameter of the laminated core 3, but is slightly larger than the inner diameter of the laminated core 3 if it is smaller than the height of the shaft protrusion 2a. But there is no functional problem.

The fitting structure between the shaft 2 and the laminated core 3 is formed as follows.
In FIG. 1, the shaft 2 is press-fitted into the laminated core 3 from the X direction in the drawing.
When the shaft 2 is press-fitted into the through hole of the laminated core 3, the outer diameter of the shaft including the protruding portion 2 a is formed larger than the inner diameter of the laminated core 3. It is crushed by fitting. When the protrusions 2a are all fitted to the inner periphery of the laminated core 3, the protrusions 2a are crushed and the fitting with the laminated core 3 in the latter half is weakened when the press-fitting length is long.

In Embodiment 1 of the present invention, the relief groove 3a of the protruding portion is formed for each stacked core portion 3b, 3c formed by dividing the laminated core 3 in the axial direction. The ridge 2a is not crushed.
In FIG. 1, when the press-fitting of the thick core portion 3b is completed, the shaft is press-fitted into the thick core portion 3c. Since the protruding portion 2a of the shaft press-fitted into the stacked core portion 3c is fitted with the protruding portion 2a located in the escape groove 3a in the stacked core portion 3b, without reducing the fitting force, The stacked core portion 3c and the shaft can be fitted.

It should be noted that the present invention can be applied even if the stacked thickness (that is, the axial length or interval) of the stacked core portions 3b and 3c for each block is not constant. That is, the fitting force can be adjusted by changing the thickness of the stacked core portions 3b and 3c.
Moreover, the fitting force can be set for each thick core portion by adjusting the number of relief grooves 3a of the protruding portion for each thick core portion 3b, 3c.

  As described above, according to the rotor of the rotating electrical machine of Embodiment 1 of the present invention, the following excellent features and operational effects are exhibited.

  Due to the relief grooves 3a of the ridges provided in the laminated core 3, all the ridges 2a are not fitted into the press-fit portions. Since the relief groove 3a of the protruding portion is formed at a predetermined interval, that is, for each stacked core portion having a certain length or for each non-constant stacked core portion, the press-fitting portion of the first stacked core portion 3b is formed. When the process is finished, in the next stacked core portion 3c, a protruding portion different from the previous protruding portion secures the fitting force between the stacked core 3c and the shaft. Accordingly, it is possible to always ensure a sufficient fitting force with the shaft in any stacked core portion.

  In addition, since each of the thick core portions 3b and 3c always has a constant fitting force, it is possible to reduce the influence of the crushing of the protrusions and the residual stress due to the metal lump caused by the press-fitting, so that the shaft by press-fitting Bending can be reduced.

  A plurality of protrusions 2a formed on the outer peripheral surface of the shaft 2 can correspond to any structure of equal intervals or unequal intervals. By adjusting the position of the relief groove 3a of the protruding portion provided in the stacked core portion and the position of the protruding portion 2a, it is possible to adjust the fitting force between the stacked core portion and the shaft and to secure the fitting force.

  The laminated core 3 is divided into stacked core portions 3b and 3c having a constant interval (that is, a fixed length), and a relief groove 3a of the shaft protrusion 2a is formed for each stacked core portion 3b and 3c. By setting the number of relief grooves according to the required fitting force between the core part and the shaft, the fitting force can be set for each stacked core part.

  Further, the laminated core 3 is divided into stacked core portions that are not at regular intervals, and the clearance groove 3a of the shaft protrusion is formed for each stacked core portion, so that the stacked core portion is adjusted in thickness. Thus, it is possible to adjust the fitting force between each thick core portion and the shaft.

  Further, the relief groove 3 a of the protruding portion 2 a of the shaft formed on the laminated core 3 side has an effect of reducing the weight of the laminated core 3. It is possible to reduce the weight of the laminated core by enlarging the escape groove 3a.

  Furthermore, a laminated core of a rotor generally used for a rotor of an electric motor is formed by punching and stacking a metal plate such as a silicon steel plate or an electric mild steel plate with a press and caulking. There is an effect that the escape groove 3a can also be used as a positioning function when the cores are stacked.

  The present invention is suitable for use in a fitting structure between a laminated core of a rotor and a shaft of an electric motor in an electric motor or the like.

2: shaft, 2a: protrusion, 3: laminated core, 3a: clearance groove 3b, 3c: stacked core.

Claims (4)

In a rotor of a rotating electrical machine configured by press-fitting a shaft into a through hole provided in the center of a laminated core,
On the outer peripheral surface of the shaft is formed an axially extending ridge that fits with the inner wall of the through hole,
The laminated core is divided into stacked core portions with a predetermined interval in the axial direction, and a clearance groove that does not fit with the protruding portion is formed on a circumferential inner wall of the through-hole for each of the divided stacked core portions. A rotor of a rotating electrical machine characterized by being formed.   2. The rotation according to claim 1, wherein the position of the relief groove formed for each stacked core portion is formed at a position different from the escape groove of another stacked core portion in the circumferential direction. Electric rotor.   The rotor of a rotating electric machine according to claim 1 or 2, wherein the predetermined interval is a constant interval.   The rotor of the rotating electrical machine according to claim 1, wherein the predetermined interval is an unequal interval.

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