JPH10322976A - Rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To curtail man-hours in a rotor-making process by abolishing the adhesive of a sensor magnet fixed to a rotor. SOLUTION: A stop ring 3 is set on a shaft 2, and the outside periphery of a collar 5 is press-fitted into the inside periphery of a sensor magnet 4 for unification on one side, and a knurling tool 6 is provided at the section of engagement with the collar 5 of the shaft 2 in a collar-setting position, whereby it is made larger than the diameter of the shaft diameter. The collar 5 integrally mounted with the sensor magnet 4 is press-fitted and fixed to the shaft knurling tool 6, and the positioning is performed by shifting it until the sensor magnet 4 abuts on the side of a stop ring 3, and further a ball bearing 7 is press-fitted until it abuts on the end face of the collar 5, and the sensor magnet 4 is caught and fixed with the stop ring 3 and the collar 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor equipped with a sensor for detecting the number of revolutions and a magnet for outputting the number of revolutions, and to a rotor having the magnets fixed.

[0002]

2. Description of the Related Art A rotor to which a magnet for outputting the number of rotations is fixed will be described with reference to FIG. Hereinafter, a conventional motor rotor will be described. FIG. 5 is a sectional view of a main part of a conventional electric motor. 1 is a rotor core, 2 is a shaft, 3 is a retaining ring, 4 is a sensor magnet, and 7 is a ball bearing. The rotor core 1 is press-fitted or caulked to the shaft 2. The retaining ring 3 is inserted into the shaft 2, and the ball bearing 7 is press-fitted from the end of the shaft 2 and positioned by the retaining ring 3. The sensor magnet 4 is positioned by the retaining ring 3 and fixed to the shaft 2 by an adhesive.

[0003]

However, the configuration of the above-mentioned conventional technique has the following problems.
In the case of FIG. 5, the sensor magnet is fixed to the shaft with an adhesive. Generally, a motor rotor generates heat and the temperature becomes high. Therefore, a material having high heat resistance is selected for the adhesive. However, such an adhesive has a very long time until hardening and requires a high temperature. Many are cured. Therefore, the workability is very poor, which causes a cost increase. When the temperature is hardened, increasing the temperature inevitably causes the ball bearings to be post-press-fitted, so that the step of forming the rotor occurs twice, which makes automation difficult and increases the cost. SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and eliminates the adhesion of the sensor magnet, reduces the number of steps in the rotor preparation process, and improves the reliability against the temperature rise and reduces the cost. The purpose is to provide.

[0004]

In order to achieve this object, the rotor of the present invention has the following configuration.
A retaining ring is inserted into the shaft, the outer periphery of the collar is press-fitted into the inner periphery of the sensor magnet and integrated, and then the inner periphery of the collar is press-fitted into the shaft. That is, a knurl is provided at the fitting portion of the shaft at the color insertion position with the collar to make the shaft larger than the shaft diameter, and the color integrated with the sensor magnet is press-fitted and fixed to the shaft knurl, The collar is press-fitted and positioned by moving the sensor magnet until it comes into contact with the retaining ring side.
The sensor ring is press-fitted until it abuts against the end surface of the sensor magnet, and the sensor magnet is sandwiched and fixed between the retaining ring and the collar.

[0005]

With this configuration, the sensor magnet can be securely fixed without using an adhesive by a retaining ring, a ball bearing, and a collar, and an axial displacement can be eliminated. In addition, with respect to the displacement in the circumferential direction with respect to the shaft, the H-cut processing portion provided on the inner peripheral side of the sensor magnet is provided with a collar.
Can be press-fitted and fixed by the H-cut processing portion and the projection provided on the outer peripheral side of the, and can eliminate the displacement in the circumferential direction. Also, the number of steps in the rotor creation process can be significantly reduced.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a rotor core, 2 is a shaft, 3 is a retaining ring, 4 is a sensor magnet, 5 is a collar, 6 is a knurl, and 7 is a ball bearing. The rotor core 1 is press-fitted or caulked to a shaft 2, and a retaining ring 3 is inserted into the shaft. Sensor magnet 4
The outer circumference of color 5 is pressed into the inner circumference of
By forming a knurl 6 at the fitting portion of the shaft 2 with the collar 5, the knurl portion becomes larger than the shaft diameter, and the collar 5 integrated with the sensor magnet 4 is moved to the shaft knurl. By press-fitting and fixing the shaft 6, the collar generates a large amount of friction in the rotation direction of the shaft, so that the movement in the rotation direction can be prevented.

Further, even if there is a clearance for tolerance of magnet forming between the sensor magnet 4 and the collar 5, the
The plurality of protrusions provided on the outer peripheral side of No. 5 make a press-fit state.
The positioning is performed by moving the sensor magnet 4 until it comes into contact with the retaining ring 3 side.
The sensor magnet 4 is clamped between the retaining ring 3 and the collar 5 to be fixed. With such a configuration, a shift in the shaft direction can be eliminated.

In order to prevent the sensor magnet and the collar from being displaced in the rotational direction, an H-cut portion provided on the inner peripheral side of the sensor magnet and the outer peripheral side of the collar are provided between the sensor magnet and the collar. When the H-cut processing portion is inserted in alignment with the H-cut processing portion, a plurality of projections provided on the outer peripheral side of the collar can be press-fitted and fixed, thereby eliminating a shift in the rotation direction.

FIG. 2 is a plan view of the sensor magnet of the present invention. On the inner peripheral side of the sensor magnet, an H-cut processing portion 8 is fitted so as to fit with an H-cut processing portion provided on the outer periphery of the collar.
Is provided.

FIG. 3 is a plan view of the collar according to the present invention. A plurality of projections 9 are provided on the outer periphery of the collar so that the gap between the sensor magnet and the collar can be interposed in a press-fit state. An H-cut processing portion 10 is provided on the outer periphery of the collar so as to fit with an H-cut processing portion provided on the inner peripheral side of the sensor magnet.
Is provided.

FIG. 4 is a half sectional view taken along the line A--A in FIG. 3, and reference numerals 9 and 10 denote protrusions provided on the collar and H, respectively.
It is a cutting part.

[0012]

As described above, the sensor magnet of the present invention is sandwiched between the retaining ring, the ball bearing, and the collar, and can be fixed without using an adhesive, so that the man-hour for the rotor making process can be greatly reduced. is there.

[Brief description of the drawings]

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

FIG. 2 is a plan view of a sensor magnet according to one embodiment of the present invention.

FIG. 3 is a plan view of a color according to an embodiment of the present invention.

FIG. 4 is a half sectional view taken along line AA of FIG. 3;

FIG. 5 is a sectional view of a main part of a conventional electric motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor core 2 Shaft 3 Retaining ring 4 Sensor magnet 5 Color 6 Rollet 7 Ball bearing 8 H cut processing part 9 Projection 10 H cut processing part

Claims (4)

[Claims] 1. A motor having a rotor provided with a sensor magnet for position detection, comprising: a retaining ring in which the sensor magnet is inserted into the shaft;
A rotor characterized in that it is clamped and fixed by a collar held by a let. 2. The rotor according to claim 1, wherein the shaft, the ball bearing and the collar are press-fitted and fixed, and a clearance is provided between the outer circumference of the collar and the inner circumference of the sensor magnet. 3. An H-cut portion provided on the inner peripheral side of the sensor magnet and an H-cut portion provided on the outer peripheral side of the collar are fixed so as to match with each other. -Ta. 4. The rotor according to claim 1, wherein a protrusion is provided on the outer periphery of the collar, and is interposed in a gap between the outer periphery of the collar and the inner periphery of the sensor magnet.