JPH01174243A - Balancing quantity correction method for rotator - Google Patents

Abstract

PURPOSE:To adjust a very little balancing quantity easily, by putting a solid adhesive into a tap hole and thereafter by screwing an adjusting screw into the hole so as to control the balancing quantity. CONSTITUTION:A magnet 2 being a rotator is arranged in opposition to a stator. When at least one of the messes of the upper and lower parts of the rotator is biased radially at the time of examination of the balance of the rotator, at least one of radial side screws 4a, 4b of upper and lower tap holes 6a, 6b is screwed into the hole with solid adhesive 5a, 5b placed at the tip of the screw to adjust the balancing quantity. Even a very little quantity can also be adjusted by the feed pitch of the screw. Because the adhesive is first put into the tap hole, it is possible to correct the balancing quantity including the adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for correcting the balance of a rotating body used in an electric motor or the like.

2. Description of the Related Art In recent years, rotating parts such as electric motors are required to rotate at higher speeds and have characteristics such as low vibration and long life, and in order to meet the above characteristics, it has become necessary to reduce the amount of unbalance in the rotating parts. There is.

Hereinafter, an example of a conventional method for correcting the balance amount of a rotating body shown in FIGS. 3 and 4 will be described.

FIG. 3 is a diagram showing a first conventional example, in which a shaft 1 is fitted and fixed in a rotor housing 2, and a magnet 2 is fitted and fixed on the outer circumferential surface of the rotor housing 2. Balance rings 3c and 3d are provided. Annular recesses 15a and 15b are provided at the inner circumference of the upper surface of the upper balance ring 3c and the inner circumference of the lower surface of the lower balance ring 3d, respectively.

The operation of the rotating body configured as described above will be explained below.

Although not shown, the rotating body generates rotational force through the action of a stator located opposite the magnet 2. When inspecting the balance amount of the rotating body, if the mass of the upper part and the lower part of the rotating body are small (if one of them is biased to one side in the radial direction, at least one of the upper recess 15a and the lower recess 15b) Apply adhesive or the like to the other side in the radial direction to increase the mass on the lighter side to correct the balance of mass in the radial direction and prevent shaft vibration.

Further, FIG. 4 is a diagram showing a second conventional example, and the same parts and structures as those of the first conventional example are given the same symbols and their explanations are omitted. On the same outer periphery of the balance rings 3a and 3b, three or more tapped holes 6 are provided at equal angular intervals.
A and 6b are provided, and the balance amount is corrected by using screws 4a and 4b, respectively, and screwing in or loosening the screws 4a and 4b. After the correction, adhesive is applied to the outside of the screws 4a and 4b to fix them.

Problems to be Solved by the Invention However, in the conventional configuration described above, correction by applying adhesive as in the first conventional example requires only the angle at which the adhesive should be applied and the mass of the adhesive. It was extremely difficult to make small adjustments to the balance.

In addition, in corrections using screws as in the second conventional example, the amount to be added or deleted can be controlled by the feed pitch of the screws, and the angle regulation can be controlled by vector composition of screws at two or more places, but it is not possible to fix the screws. Each method has disadvantages in that the corrected balance amount changes depending on the mass of the adhesive applied, and there is also a high risk of the adhesive scattering.

The present invention solves the above-mentioned problems and provides a method for correcting the balance amount of a rotating body in which a minute balance amount can be easily corrected and the balance amount after correction does not change.

Means for Solving the Problems In order to solve the above-mentioned problems, the method for correcting the balance amount of a rotating body according to the present invention includes providing three or more tapped holes in the rotating member at equal angular intervals on the same outer circumference, and After injecting solid adhesive into the hole, the adjustment screw is screwed in to correct the balance amount.

Function: With this method, the solid adhesive is injected into the tap hole before the adjustment screw, so it is possible to correct the balance amount of the rotating body including the adhesive, and even minute balance changes can be easily made. be able to.

Furthermore, the position of the adhesive is regulated within the tapped hole by the adjustment screw, and can be prevented from scattering due to rotation of the rotating body.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a rotating body used in an embodiment of the method for correcting the balance amount of a rotating body according to the present invention.

In FIG. 1, 1 is a shaft, 2 is a magnet, and 3a.

3b is a balance ring, 4a and 4b are screws, and 7 is a rotor housing, which are the same as those of the second conventional example. 5a and 5b are solid adhesives, and tap holes 6a of balance rings 3a and 3b.

After injection into 6b, adjustment screws 4a and 4b are screwed in, respectively.

A method for correcting the balance amount of the rotating body configured as described above will be explained below.

Although the stator side (stator) that generates the driving force is not shown, it is disposed facing the magnet 2, which is a rotating body, and generates the rotational force. When inspecting the balance amount of the rotating body, if at least one of the upper mass and the lower mass of the rotating body is offset in the radial direction, at least one of the upper tapped hole 6a and the lower tapped hole 6b is shifted in the radial direction. Apply solid adhesive 5 to the side screws 4a and 4b, respectively.
a.

5b first and screw it in to correct the balance amount of the mass in the radial direction of the rotating body. In addition, the amount of balance correction can be made by adjusting the feed pitch of the screw.
Furthermore, if there is no screw at the angle to be corrected, screw in two or more nearby screws and perform correction by vector synthesis.

Further, FIG. 2 shows a polygon mirror scanner of a laser beam printer to which the embodiment shown in FIG. 1 is applied.

In FIG. 2, a shaft 1 is fitted and fixed in a rotor housing 7, and a magnet 2 is fitted and fixed on the outer peripheral surface of the rotor housing 7. A polygon mirror 9 is fastened to the rotor housing 7 via a presser plate 8, and a balance ring 3a is fixed to the upper surface of the rotor housing 7 by fitting into the shaft 1. Note that tapped holes 6a are provided at equal angular intervals on the same outer circumference of the balance ring 3a. In addition, the rotor housing 7
There is also a tapped hole 6 similar to the balance ring 3a on the outer periphery of the balance ring 3a.
b is provided and also serves as a balance ring. The tapped holes 6a and 6b are filled with a solid adhesive 5a,
After 5b is injected, adjustment screws 4a and 4b are screwed in. In addition, the stator 1 faces the magnet 2.
0 is fixed to a frame 12 fitted with a base 11, and ball bearings 13a and 13b are attached to the base 11 and the frame 12, respectively, and the shaft 1
is rotatably supported. Note that 14 is a magnetically sensitive element, and the magnet 2. Detects the position of a rotating body such as the rotor housing 7.

In the illustrated application example, a ball bearing is used for the bearing portion, but a hydrodynamic bearing, a magnetic bearing, etc. may also be used. Further, although the rotor housing was provided with a tapped hole to serve as a balance ring, it is also possible to provide a tapped hole in the presser plate and use it also as a balance ring.

Further, the present invention can also be applied to a rotating body in which a rotating shaft is fixed to a base or the like, and a sleeve or the like is rotatably rotated via a bearing.

As described above, according to the present invention, after the solid adhesives 5a, 5b are injected into the tapped holes 6a, 6b, the adjusting screws 4a, 4
By adjusting the balance amount by screwing in b, it is easy to make minute adjustments to the balance amount, and since there is no need to apply adhesive or the like to fix the screw after correction, changes in the balance amount are also prevented. There will be no adhesive scattering.

Effects of the Invention As is clear from the above explanation, in the present invention, the balance amount is corrected by screwing in the adjustment screw after solid adhesive is injected into the tapped hole, so the angle regulation for balance correction is achieved by vector composition of the screws. Moreover, since the amount of correction can be controlled by the feed pitch of the screw, it is easy to make minute balance corrections.Furthermore, there is no need to apply new adhesive to fix the screw, and the adhesive applied after correction can be easily adjusted. To provide a method for correcting the balance amount of a rotating body that can realize an excellent rotating body that does not change the balance amount due to the adhesive and eliminates the scattering of the adhesive.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotating body using the method of one embodiment of the present invention, FIG. 2 is a sectional view of a rotating body to which the embodiment of FIG. 1 is applied, and FIGS. 3 and 4 are 1 is a cross-sectional view of a rotating body using a conventional method; FIG. 3a, 3b... Balance ring, 4 a +
4 b...adjustment screw, 5a, 5b...
Solid adhesive, 6 a r6b...Tapped hole,
7... Rotor housing, 8... Pressing plate, 9... Polygon mirror, 10... Stator, 11... Base, 12... ...Frame, 13a, 13b...Ball bearing, 14...
...Magnetic sensing element. Name of agent: Patent attorney Toshio Nakao and one other person Figure 1 Figure 2 Figure 3 Figure 5a +5b Figure 4

Claims (1)

[Claims] Tap holes provided at three or more locations at equal angular intervals on the circumference of a cylindrical rotating member fixed to a rotating shaft, adjustment screws for balance adjustment fitted into the tapped holes, and fixing of the adjustment screws. A method for correcting the amount of balance of a rotating body, comprising: injecting the solid adhesive into the tapped hole, and then inserting an adjusting screw into the tapped hole to correct the amount of rotational balance.