JP4547763B2 - Motor rotor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotor of a motor, and more particularly to a vibration isolation structure for a rotor core.
[0002]
[Prior art]
FIG. 5A is a left side view showing an example of a rotor of a conventional motor, FIG. 5B is an AOB sectional view, and FIG. 5C is a right side view.
2. Description of the Related Art Conventionally, a rotor 1 of a motor is provided with a permanent magnet 4 on the outer periphery, and two rubbers in a gap between the permanent magnet 4 and a rotor core 2 fitted to a rotary shaft 3 provided at the center. The shock-absorbing member 5 is disposed so as to face each other.
At the same time, the outer end surfaces of the buffer member 5 are held by end plates 6 that respectively hold down, and are fitted by pins 11 and stoppers 12.
[0003]
However, since the buffer member 5 and the rotor core 2 are inserted into the permanent magnet 4 from the direction of the rotation axis and fitted and attached in that direction, the number of the buffer members 5 is two, which increases material costs and mounting man-hours. There was a risk that it would be an obstacle.
Further, in order to prevent the displacement (peripheral runout) between the permanent magnet 4 and the rotating shaft without impairing the buffering effect of the buffer member 5, the outer diameter of the permanent magnet 4 is cut, which may increase man-hours. There was a problem.
Further, when the number of the buffer members 5 is one, a means for preventing the permanent magnet 4 from being removed is required, which may increase the cost.
On the other hand, the vibration-proof structure technology disclosed in Japanese Patent Laid-Open No. 9-149571 has a problem that the number of parts is increased, the number of manufacturing processes is increased, and a structure for reducing the displacement between the permanent magnet and the rotating shaft is not provided. Has been.
[0004]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and reduces the vibration and noise of the rotor of the motor and reduces the deviation between the permanent magnet and the rotating shaft to improve the reliability and reduce the manufacturing cost. It aims to provide a rotor.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a permanent magnet having a projecting portion projecting inwardly on a cylindrical inner periphery, a rotor core fitted to a rotation shaft provided at the center portion and having a detent on the outer periphery, An insertion hole at the center portion, a fitting groove fitted to the detent, and a fitting groove fitted to the convex portion at the outer peripheral portion, arranged in a gap between the rotor core and the permanent magnet , Corresponding to the length of the convex portion on one side, the flange abutting with one end of the convex portion of the permanent magnet, and the other side edge between the fitting hole of the outer peripheral portion and the insertion hole of the central portion A buffer member having a retaining protrusion projecting inward, and a pair of end plates disposed on the outer end surface of the cushioning member and having an insertion hole in the center, and between the flange of the cushioning member and the retaining member The end plate is inserted into and fixed to the rotary shaft from both ends.
[0006]
Then, the stopper of the buffer member is configured to reversely project outward from the inside when being clamped.
[0007]
Further, a notch is formed in a circumferential side portion of the buffer member to prevent it from being removed.
[0008]
Further, the axial cross-sectional shape of the buffer member to prevent it from being pulled out is a sector shape.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail based on examples with reference to the accompanying drawings.
1A is a left side view showing an example of a rotor according to the present invention, FIG. 1B is an AOB sectional view, FIG. 2C is a right side view, and FIG. 2A is a cushioning member of the rotor according to the present invention. FIG. 3B corresponds to FIG. 1 of the rotor according to the present invention. FIG. 3B is a cross-sectional view taken along the line AA, FIG. FIG. 4 is a side view showing an embodiment of an end plate of a rotor according to the present invention.
Here, the same reference numerals are used for the same parts as in the conventional example.
In the figure, 1 is a rotor, 2 is a rotor core, 3 is a rotating shaft, 3a is a detent, 4 is a permanent magnet, 4a is a convex part, 4b is a chamfered part, 5 is a buffer member, 5a is an insertion hole, and 5b is a fitting Fitting groove, 5c is a fitting groove, 5d is a stopper, 5e is a notch, 5z is a flange, 6 is an end plate, 6a is a flange, 6b is an insertion hole, and 6c is a caulking portion.
[0010]
The rotor 1 according to this embodiment includes a rotor core 2, a rotating shaft 3, a rotation stop 3a, a permanent magnet 4, a buffer member 5, an end plate 6, and the like.
First, main components will be described. A rotor core 2 that is fitted to the rotary shaft 3 and has a detent 3a on the outer periphery is provided at the center.
The permanent magnet 4 includes a convex portion 4a projecting inwardly on a cylindrical inner periphery.
And the buffer member 5 arrange | positioned in the space | gap part between the said rotor core 2 and the said permanent magnet 4 is a rubber | gum, and fitting is fitted with the insertion hole 5a and the said detent | locking 3a in the center part. A groove 5b, a fitting groove 5c fitted on the outer peripheral portion with the convex portion 4a, a flange 5z abutted with one end of the convex portion 4a of the permanent magnet 4 on one side, and the fitting of the outer peripheral portion On the other side edge between the hole 5c and the insertion hole 5a in the central portion, there is a retainer 5d protruding inward and a notch 5e on the circumferential side of the retainer.
[0011]
The pair of end plates 6 disposed on the outer end surface of the buffer member 5 has an insertion hole 6b and a crimping portion 6c in the center portion, and a flange 6a that protrudes opposite to the buffer member 5 in the outer peripheral portion. Yes.
Using such components, the convex portion 4a of the permanent magnet 4 is sandwiched between the flange 5z and the retaining member 5d of the buffer member 5, and the end plate 6 is inserted into the rotary shaft 3 from both ends. The caulking portion 6c is caulked and fixed.
[0012]
The retaining member 5d of the buffer member 5 is reversely projected from the inside to the outside when being clamped.
In this embodiment, the axial cross-sectional shape of the retaining member 5d of the buffer member 5 is a fan shape.
[0013]
Next, functions and effects of the present invention according to the above-described embodiment will be described.
The flange 5z provided on one side of the buffer member 5 is brought into contact with one end of the convex portion 4a of the permanent magnet 4, and the retaining member 5d of the buffer member 5 is fixed to the end plate 6 and the convex portion 4a of the permanent magnet 4. Therefore, the vibration and noise of the rotor 1 can be reduced, and the deviation (swing) between the permanent magnet 4 and the rotation center of the rotary shaft 3 can be suppressed to prevent the permanent magnet 4 from falling off. Reliability can be improved.
[0014]
Further, since the buffer member 5 is a single rubber part, the assembly workability of the rotor 1 of the motor can be improved as compared with the case of two parts, and the axial cross-sectional shape of the retaining member 5d of the buffer member 5 is improved. It has a sector shape and has a notch 5e on the circumferential side of the retaining member, making it easy to invert and protrude outward when the retaining member 5d of the buffer member 5 is clamped by utilizing the flexibility of the shape of rubber. As a result, manufacturing costs can be reduced.
On the other hand, because of the structure in which the permanent magnet 4 is supported at the end in the axial direction, deviation (swing) between the permanent magnet 4 and the rotation center of the rotating shaft 3 can be suppressed. As a result, the outer diameter of the permanent magnet 4 can be reduced. Is not necessary for correcting the deviation (runout), and the number of manufacturing steps can be reduced.
[0015]
【The invention's effect】
As described above, in the present invention, a permanent magnet provided with a convex portion projecting inwardly on a cylindrical inner periphery, a rotor core fitted to a rotation shaft provided at the center and having a detent on the outer periphery, It is arranged in a gap between the rotor core and the permanent magnet, and has a through hole in the center, a fitting groove fitted to the detent, and a fitting groove fitted to the convex part on the outer periphery. And a flange abutting on one side with one end of the convex portion of the permanent magnet, and the length of the convex portion on the other side edge between the fitting hole of the outer peripheral portion and the insertion hole of the central portion. Correspondingly, a buffer member having a stopper projecting inward and a pair of end plates disposed on the outer end surface of the buffer member and having an insertion hole at the center, the flange of the buffer member and the stopper The convex portion of the permanent magnet is sandwiched therebetween, and the end plate is inserted and fixed to the rotating shaft from both ends.
As a result, it is possible to reduce the vibration and noise of the rotor of the motor, reduce the deviation (peripheral runout) between the permanent magnet and the rotating shaft, improve the reliability, and provide the rotor of the motor with reduced manufacturing costs.
[Brief description of the drawings]
1A is a left side view showing an example of a rotor according to the present invention, FIG. 1B is an AOB cross-sectional view, and FIG. 1C is a right side view;
2A is a left side view showing an embodiment of a buffer member of a rotor according to the present invention, FIG. 2B is a cross-sectional view taken along line AA, FIG. 2C is a right side view, and FIG. It is sectional drawing.
3 is an enlarged cross-sectional view of a main part of an AOB corresponding to FIG. 1 of a rotor according to the present invention.
FIG. 4 is a side view showing an embodiment of an end plate of a rotor according to the present invention.
5A is a left side view showing an example of a conventional rotor of a motor, FIG. 5B is an AOB sectional view, and FIG. 5C is a right side view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotor core 3 Rotating shaft 3a Non-rotating 4 Permanent magnet 4a Protruding part 5 Buffering member 5a Insertion hole 5b Fitting groove 5c Fitting groove 5d Stopping 5e Notch 6 End plate 6a Flange 6b Insertion hole 6c Caulking part

Claims (3)

A permanent magnet provided with a convex portion projecting inwardly on a cylindrical inner periphery, a rotor core fitted to a rotation shaft provided at the center and having a detent on the outer periphery, and between the rotor core and the permanent magnet An insertion hole at the center, a fitting groove fitted to the detent, a fitting groove fitted to the convex part on the outer periphery, and the permanent magnet on one side. A flange that comes into contact with one end of the convex portion, and a stopper that protrudes inward corresponding to the length of the convex portion on the other side edge between the fitting hole of the outer peripheral portion and the insertion hole of the central portion And a pair of end plates which are disposed on the outer end surface of the buffer member and have an insertion hole in the center, and the retaining member of the buffer member is reversely projected outward from the inside. ends Te, while sandwiching the protruding portion of the permanent magnet between the flange and the retaining of said buffer member, said end plate to said rotary shaft The rotor of the motor, characterized in that formed by al inserts fixed. 2. The motor rotor according to claim 1, wherein a notch is formed in a circumferential side portion of the buffer member. The rotor of the motor according to claim 1 or 2, wherein the axial cross-sectional shape of the buffer member to prevent it from dropping is a sector shape.

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