JPS63154054A - Rotor - Google Patents

Abstract

PURPOSE:To reduce a shaft fluctuation without reducing a shaft strength by disposing a spacer made of a material having a larger elastic modulus than a shaft material between a rotor core and a bearing. CONSTITUTION:A spacer 12 made of a material (aluminum) having larger elastic modulus than the material of a shaft 1 is disposed between a rotor core 2 and a bearing 3 to suppress a shaft fluctuation to a small value without reducing the shaft strength in an inexpensive and easy structure. Even when the perpendicularity accuracy of the spacer with respect to the shaft is not precise so that the inner race of the bearing pressurizes the spacer end face, it is absorbed by the deformation of the spacer to suppress the deformation of the shaft to a small value.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotor for a motor used in a vacuum cleaner or a blower.

2. Description of the Related Art As shown in FIG. 3, a motor generally used in a vacuum cleaner has a structure in which a rotor core 2 and a bearing 3 are inserted into a shaft 1, and the rotor is held between a bracket 6 and a bracket 7. .

To fix the bearing 3 on the shaft 1, as shown in FIG.
There is a method in which a step is provided between the outer diameter of the center H8 and the outer diameter of the bearing portion 9, and the bearing 3 is fixed against the stepped portion 4, or a groove 10 is provided in the shaft 1 as shown in FIG. Stop ring 11
A method has been used in which the bearing 3 is fixed by being inserted into the groove and brought into contact with the stop ring 11. In addition, in FIG. 4 and FIG. 5, 5 is shaft insulating paper.

Problems to be Solved by the Invention However, in the configuration shown in FIG. Outer diameter runout occurs on the output side of
The pressure to press-fit bearing 3 into shaft 1 is 9+m+ in shaft diameter.
In this case, approximately 300 [kg/cj] is required, and when the bearing 3 is brought into contact with the step surface of the shaft 10 with this pressure, the inner ring of the bearing will come into contact with the surface of the shaft step portion 4.

Since the surfaces of the two sides align, a misalignment of the axis occurs.

Further, in the configuration shown in FIG. 5, since the shaft 1 is provided with the groove 10 for fixing the stop ring, the minimum shaft diameter is about 85%, and the shaft strength is reduced to about 6096 mm. However, since the stop ring 11 is an elastic body, variations in bearing position are absorbed by deformation of the stop ring 11, so shaft runout is less likely to occur.

Such shaft wobbling and strength reduction have a large effect on the balance of the rotating body, so there has been a problem that vibration defects occur during mass production.

In view of the above-mentioned problems, the present invention provides a rotor that is inexpensive and has a structure that reduces shaft runout without reducing shaft strength.

Means for Solving the Problems In order to solve the above-mentioned problems, the rotor of the present invention includes a spacer made of a material having a higher elastic modulus than the shaft material between the rotor core inserted into the shaft and the bearing. It is configured to be deployed.

Effect: With the above-described configuration of the present invention, even if the perpendicularity of the spacer to the shaft is poor and pressure is applied to one end face of the spacer by the inner ring of the bearing, the deformation of the spacer absorbs the pressure, and the deformation of the shaft is suppressed to a small level. .
'Example A rotor according to an example of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 show a rotor in an embodiment of the present invention. In Fig. 1, 1 is a shaft, 2 is a rotor core that is press-fitted onto the shaft 1, 3 is a bearing whose inner ring is press-fitted onto the shaft 1, and 12 is an aluminum piece inserted between the rotor core and the bearing. This spacer is provided on the outer periphery of the shaft insulating paper 5.

As described above, according to this embodiment, the rotor core 2 and the bearing 3
By arranging a spacer 12 made of a material (aluminum) with a higher elastic modulus than that of the material of the shaft 1 between the shaft 1 and the shaft 1, it is possible to suppress the shaft runout to a small level without reducing the shaft strength with an inexpensive and easy configuration. can.

Effects of the Invention As described above, the present invention provides a spacer made of a material with a higher elastic modulus than the shaft material between the rotor core and the bearing, thereby preventing the shaft strength from decreasing (and being inexpensive). Axial blurring can be reduced with a large and easy configuration.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotor in an embodiment of the present invention, and FIG.
The figure is a partially cutaway perspective view of Fig. 1, Fig. 3 is a half-sectional view of a conventional vacuum cleaner motor, Fig. 4 is a half-sectional view of the rotor section of Fig. 3, and Fig. 5 is another one. FIG. 2 is a sectional view of a rotor in a conventional example. 1... shaft, 2... rotor core, 3...
...Bearing, 12...Spacer. Name of agent: Patent attorney Toshio Nakao and 1 other person 1-axis

Claims (1)

[Claims] A spacer between the rotor core and the bearing, comprising a shaft, a rotor core fixed to the shaft, a bearing having an inner ring fixed to the shaft, and a spacer made of a material having a higher elastic modulus than the shaft. A rotor in which the spacer is arranged.