JPH09327142A - Rotor for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor, for a motor, which prevents a vibration and a noise from being transmitted, specifically, regarding the mounting structure of a rotor core onto a shaft. SOLUTION: A plurality of nearly U-shaped grooves 2b are formed radially along the axial direction on the inner circumferential wall of an insertion and passage hole 2a formed in the center of a rotor core 2. Nearly U-shaped notches 3a whose length is shorter than that of the grooves 2b are formed in the axial direction on the outer circumferential part of a shaft 3. Nearly sheetlike tangential stoppers 4 whose thickness wt is nearly identical to the width (w) of the notches 3a, whose length is nearly identical to that of the notches 3a and whose width dt is nearly identical to the sum of the width (d) of the notches 3a and the depth ds of the grooves are installed. Ends on one side are fitted into the notches 3a, the shaft 3 is inserted into, and passed through, the insertion and passage hole 2a, ends on the other side are inserted into the grooves 2b, shock- absorbing members are interposed and mounted on both sides, E-rings are fitted, and the rotor core 2 is attached so as to be freely slidable along the axial direction of the shaft 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of an electric motor, and more particularly to a mounting structure for a rotor core and a rotary shaft.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a rotor 1 of an electric motor has an insertion hole 2a formed at the center of a rotor core 2, and a rotary shaft 3 is inserted into the insertion hole, and then the rotor is rotated. The periphery of the insertion holes on both end faces of the iron core 2 was fixed by caulking 2z.

Alternatively, the insertion hole 2 is formed at the center of the rotor core 2.
Although not shown in the drawing, the rotary shaft 3 was formed by forming a and knurled, and the rotary shaft was press-fitted and fixed in the insertion hole.

In this case, a vibration damping member such as a spring or a seat is mounted between the bearing and the bracket for vibration damping, but no vibration damping member is interposed between the rotor core and the rotating shaft. There is a problem in that vibration in the thrust direction of the rotor may be transmitted to the blades of the fan via the rotary shaft to generate noise, without being mounted.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. When the rotor core and the rotary shaft of the electric motor are mounted, the rotation of the electric motor is prevented from transmitting vibration and noise. Intended to provide children.

[0006]

In order to achieve the above object, in a rotor of an electric motor in which a rotary shaft is attached to an insertion hole formed at the center of a rotor core, a shaft is provided on an inner peripheral wall of the insertion hole. A plurality of substantially U-shaped grooves are radially formed along the direction, and a substantially U-shaped notch shorter than the length of the groove is formed in the axial direction of the outer peripheral portion of the rotating shaft. In the circumferential direction sandwiching the longitudinal direction of the notch, each E-ring mounting groove is formed with a space longer than the axial length of the rotor core, and the thickness is substantially the same as the width of the notch, A substantially plate-shaped tangential stopper having substantially the same length as the notch and a width substantially equal to the sum of the depth of the notch and the depth of the groove is provided, and one side thereof is fitted into the notch. Insert the rotary shaft through the insertion hole, insert the other side into the groove, and then A cushioning member is provided on both sides of the rotor core, and the E-ring is fitted into the mounting groove of the E-ring, whereby the rotor core is slidably mounted along the axial direction of the rotary shaft. To do so.

Alternatively, in a rotor of an electric motor in which a rotary shaft is attached to an insertion hole formed in the center of a rotor core, a plurality of substantially U-shaped grooves are formed on an inner peripheral wall of the insertion hole along an axial direction. Radially formed, and in the axial direction of the outer peripheral portion of the rotating shaft, a substantially U-shaped notch having substantially the same length as the length of the groove is formed on the rotating shaft, and rotation not forming the notch. The outer diameter of both ends of the shaft is formed to be narrower than the bottom position of the cutout, and is longer than the axial length of the rotor core in the circumferential direction at the positions sandwiching the longitudinal direction of the cutout of the rotary shaft. Forming mounting grooves for the E-rings at intervals, with a thickness that is approximately the same as the width of the groove, a length that is shorter than the length of the groove, and a width that is approximately the same as the sum of the depth of the groove and the depth of the notch. Approximately plate-shaped tangential stopper is provided, and one side of it is located at the center of the groove Insert the other side into the notch and insert the rotary shaft into the insertion hole, and then insert a buffer member on both sides of the rotor core, and insert the E ring into the mounting groove of the E ring. By fitting, the rotary shaft is slidably attached along the axial direction of the rotor core. Then, the longitudinal gap between the groove and the tangential stopper is made substantially equal to the maximum amplitude of thrust vibration when the rotor rotates.
Further, the fitting tolerance between the notch or the groove and the tangential stopper is a clearance fit. further,
The material of the tangential stopper is steel.

Alternatively, the tangential stopper is formed integrally with the rotary shaft. Alternatively, the tangential stopper is formed integrally with the rotor core.

On the other hand, the material of the buffer member is rubber. Alternatively, the cushioning member is an annular leaf spring.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In a rotor of an electric motor in which a rotary shaft is attached to an insertion hole formed in the center of a rotor core, a plurality of substantially U-shaped members are formed on an inner peripheral wall of the insertion hole along an axial direction. Grooves are formed radially, and a substantially U-shaped notch shorter than the length of the groove is formed in the axial direction of the outer peripheral portion of the rotary shaft, and the circumference of a position sandwiching the notch in the longitudinal direction. Direction, the mounting grooves of the E-rings are formed at intervals longer than the axial length of the rotor core, and the thickness of the notch is approximately the same as the width of the notch. , Providing a substantially plate-shaped tangential stopper having a width substantially the same as the sum of the depth of the notch and the depth of the groove, one side of which is fitted in the notch and the rotary shaft is inserted through the insertion hole. , Insert the other side into the groove, and then insert cushioning members on both sides of the rotor core. And, by fitting the E ring mounting groove of the E ring, to be mounted slidably along the rotor core in the axial direction of the rotary shaft. With this configuration, transmission of vibration and noise between the rotor core of the electric motor and the rotary shaft is prevented.

[0011]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, the same parts as those in the conventional example are denoted by the same reference numerals.

FIG. 1 is a sectional view of an embodiment of a rotor of an electric motor according to the present invention, and FIG. 2 is a sectional view corresponding to the section AA 'in FIG.

At the center of the rotor core 2, there is formed an insertion hole 2a through which the rotary shaft 3 is inserted, and a plurality of substantially U-shaped grooves 2b are radially formed on the inner peripheral wall thereof along the axial direction. .
At the same time, in the axial direction of the outer peripheral portion of the rotary shaft 3, the length Ls of the groove is shorter than the length Ls of the groove by about the same as the maximum amplitude of thrust vibration when the rotor 1 rotates. A substantially U-shaped notch 3a having a width w narrower than the width ws is formed.

E-ring mounting grooves 3b are formed in the circumferential direction sandwiching the notch with a space longer than the axial length of the rotor core. Then, the thickness wt is substantially the same as the width w of the notch, the length Lt is substantially the same as the length L of the notch, and the sum of the depth d of the notch and the depth ds of the groove is substantially the same. A tangential stopper 4 having a width dt and a substantially plate-shaped material of steel is provided.

Here, the fitting tolerance between one side of the tangential stopper and the notch is a clearance fit, and the one side is fitted into the notch and the rotary shaft is inserted into the insertion hole. Further, the other side is inserted into the groove.

Then, cushioning members 5 made of rubber are provided on both sides of the rotor core.

Then, the rotor core is slidably mounted along the axial direction of the rotary shaft by fitting E-rings 7 into the mounting grooves of the E-rings on both sides thereof via washers 6 respectively. It should be the rotor 1 of the electric motor.

In this embodiment, the tangential stopper has a plate shape with the same thickness, but the present invention is not limited to this, and one of the tangential stopper corresponds to the groove and the notch. It suffices that one side is fitted and the other side is inserted.

Here, the effect of the present invention will be described.
As described above, one side of the tangential stopper is fitted into the notch of the rotary shaft, while the other side is inserted into the groove of the rotor core, and the rotary shaft is arranged along the axial direction of the rotor core. It is slidably mounted, and the gap in the lengthwise direction between the groove and the tangential stopper that determines the sliding distance is formed to be approximately the same as the maximum amplitude of thrust vibration when the rotor rotates. There is.

Therefore, when thrust vibration occurs, the rotor core slides along the other side of the tangential stopper, but the thrust vibration is transmitted through the rotor. It can be prevented.

FIG. 3 is a sectional view of another embodiment of the rotor of the electric motor according to the present invention, and FIG. 4 is a sectional view corresponding to the BB 'section of FIG.

Here, a plurality of substantially U-shaped grooves 2b are radially formed in the inner peripheral wall of the insertion hole 2a formed at the center of the rotor core 2 along the axial direction.

At the same time, in the axial direction of the outer peripheral portion of the rotary shaft 3, the groove length Ls is substantially the same as the groove length Ls, and the groove width w is the same.
A substantially U-shaped notch 3a having a width w wider than s is formed on the rotary shaft 3, and both end portions 3 of the rotary shaft not having the notch are formed.
The outer diameter of c is formed to be narrower than the bottom position of the cutout, and in the circumferential direction of the position sandwiching the longitudinal direction of the cutout of the rotary shaft,
E-ring mounting grooves 3b are formed at intervals longer than the axial length of the rotor core.

The width wt of the groove is about the same as the thickness wt.
And a length Lt shorter than the length Ls of the groove and a depth d of the groove.
A substantially plate-like tangential stopper 4 having a width dt that is substantially the same as the sum of s and the depth d of the notch is provided. One side of the tangential stopper is fitted into the central portion of the groove of the insertion hole. Then, the other side is inserted into the notch and the rotary shaft is inserted into the insertion hole.

Then, cushioning members 5 are provided on both sides of the rotor core. Further, by inserting E-rings 7 into the mounting grooves of the E-rings on both sides thereof via washers 6, the rotary shaft is slidably mounted along the axial direction of the rotor iron core and the rotor of the electric motor. It may be set to 1.

The effect of this embodiment is that the above-mentioned first embodiment and the tangential stopper are fitted in the rotor core, the rotary shaft slides along the other side, and both ends of the rotary shaft are slidable. Even when the outer diameter of the portion is reduced and the tangential stopper is fitted, there is a difference in that the rotary shaft can be inserted into the insertion hole, but they are substantially the same.

Further, the tangential stopper in FIG. 1 may be formed integrally with the rotary shaft.

Alternatively, the tangential stopper in FIG. 3 may be formed integrally with the rotor core.

Alternatively, although not shown in the drawing, the buffer member may be an annular leaf spring.

[0030]

As described above, according to the present invention, one side of the tangential stopper is fitted into the notch of the rotary shaft while the other side is fitted when the rotor core and the rotary shaft of the electric motor are mounted. The rotor shaft is inserted into the groove of the rotor core, the rotary shaft is slidably attached along the axial direction of the rotor core, and the length of the groove and the tangential stopper that determine the sliding distance is set in the longitudinal direction. Since the gap is formed to have almost the same amplitude as the maximum amplitude of thrust vibration when the rotor rotates, it is possible to provide the rotor of the electric motor in which the transmission of vibration and noise is prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a rotor of an electric motor according to the present invention.

FIG. 2 is a cross-sectional view corresponding to AA ′ in FIG.

FIG. 3 is a cross-sectional view of another embodiment of the rotor of the electric motor according to the present invention.

4 is a cross-sectional view corresponding to BB 'in FIG.

FIG. 5 is a sectional view showing an example of a rotor of a conventional electric motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotor 2 rotor core 2a insertion hole 2b groove 3 rotating shaft 3a notch 3b E-ring mounting groove 3c end 4 tangential stopper 5 buffer member 6 washer 7 E-ring Ls groove length ws groove width ds groove Depth L length of notch w width of notch d depth of notch Lt length of tangential stopper wt thickness of tangential stopper dt width of tangential stopper

Claims (9)

[Claims] 1. A rotor of an electric motor in which a rotary shaft is attached to an insertion hole formed in the center of a rotor core, wherein a plurality of substantially U-shaped grooves are formed in an inner peripheral wall of the insertion hole along an axial direction. Radially formed, in the axial direction of the outer peripheral portion of the rotary shaft, to form a substantially U-shaped notch shorter than the length of the groove, in the circumferential direction of the position sandwiching the longitudinal direction of the notch. ,
E-ring mounting grooves are formed at intervals that are longer than the axial length of the rotor core, and have a thickness substantially the same as the width of the notch, a length substantially the same as the length of the notch, and A substantially plate-shaped tangential stopper having substantially the same width as the sum of the depth of the notch and the depth of the groove is provided, and one side thereof is fitted into the notch and the rotary shaft is inserted through the insertion hole,
The other side is inserted into the groove, and thereafter, cushioning members are provided on both sides of the rotor core, and the E ring is fitted into the mounting groove of the E ring, whereby the rotor core is fixed to the shaft of the rotating shaft. A rotor for an electric motor, which is mounted so as to be slidable along a direction. 2. A rotor of an electric motor, wherein a rotary shaft is attached to an insertion hole formed in the center of a rotor core, wherein a plurality of substantially U-shaped grooves are formed on an inner peripheral wall of the insertion hole along an axial direction. Radially formed, and in the axial direction of the outer peripheral portion of the rotating shaft, a substantially U-shaped notch having substantially the same length as the length of the groove is formed on the rotating shaft, and rotation not forming the notch. The outer diameter of both ends of the shaft is formed to be narrower than the bottom position of the cutout, and is longer than the axial length of the rotor core in the circumferential direction at the positions sandwiching the longitudinal direction of the cutout of the rotary shaft. Forming mounting grooves for the E-rings at intervals, with a thickness that is approximately the same as the width of the groove, a length that is shorter than the length of the groove, and a width that is approximately the same as the sum of the depth of the groove and the depth of the notch. Provide a substantially plate-shaped tangential stopper, and insert one side into the center of the groove of the insertion hole. Inserting the other side into the notch and inserting the rotary shaft through the insertion hole, and then inserting cushioning members on both sides of the rotor core, and inserting the E ring into the mounting groove of the E ring. Thus, the rotor of the electric motor, wherein the rotating shaft is slidably attached along the axial direction of the rotor core. 3. The lengthwise gap between the groove and the tangential stopper is set to be substantially the same as the maximum amplitude of thrust vibration when the rotor is rotated. The rotor of the electric motor according to item 2. 4. The rotor for an electric motor according to claim 1, wherein a fitting tolerance between the notch or the groove and the tangential stopper is a clearance fit. 5. The rotor for an electric motor according to claim 1, wherein the tangential stopper is made of steel. 6. The tangential stopper is formed integrally with the rotary shaft.
The motor rotor described. 7. The rotor of an electric motor according to claim 2, wherein the tangential stopper is formed integrally with the rotor core. 8. The rotor for an electric motor according to claim 1, wherein the material of the cushioning member is rubber. 9. The rotor for an electric motor according to claim 1, wherein the buffer member is an annular leaf spring.