JPS6284931A - Centering method for fixed disk - Google Patents

Abstract

PURPOSE:To make centering of a fixed disk against a rotary shaft possible by rotating a centering means under a condition where the centering means of approximately cylindrical shape with multiple ridges on its periphery is inserted into a hole of the fixed disk. CONSTITUTION:A fixed disk 16 fixed on a retaining block 20 is introduced over a rotary shaft 12 projecting from a motor body. A centering means 11 is then introduced over the rotary shaft 12 so that the centering means 11 is inserted into a hole 17 of the fixed disk 16 with ridges 14's of the centering means 11 located in cuts 18's of the fixed disk 16. The centering means 11 is then slowly rotated within the hole 17 of the fixed disk 16 so that the outermost surfaces 14a's of the centering means 11 coincide with inner arc part 17a of the hole 17 of the fixed disk 16. With this coincidence, the centering of the fixed disk 16 is finished The centering means 11 is of approximately cylindrical shape having in its center a hole 13 of a diameter approximately the same with that of the rotary shaft 12 and ridges 14's on its periphery.

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to a fixed disk centering method.

b. Prior Art FIGS. 6 and 7 show a fixed disk 1 used in a conventional product such as an encoder.

The fixed disk 1 has a hole 2 in its center, and three slits 3 are formed in a part of the periphery of the hole.

The fixed disk 1 is attached on a substantially cylindrical holding block 4.

The fixed disk 1 is conventionally centered using a centering means 5 as shown in FIGS. 8 to 11.

This centering means 5 includes an outer cylinder part 7 having a substantially flared shape supported by a cylindrical base part 6, and a throttle member 8 installed at one end 7a of a small diameter of the outer cylinder part.

The base 6 has a rotating shaft insertion hole 6a having a diameter approximately equal to the diameter of a rotating shaft (not shown) to be inserted therethrough.

The outer cylindrical portion 7 has a plurality of grooves 9 extending in the axial direction formed in the other end 7b having a large diameter, and is fixed to the base 6 at one end 7a.

Further, the outer peripheral surface of one end 7a of the outer cylinder portion 7 is threaded.

The aperture member 8 has a cylindrical shape, has a female thread formed on its inner circumferential surface, and has a pressing portion 8a on its inner diameter portion at one end.

The aperture member 8 is rotatably screwed onto one end 7a of the outer cylindrical portion 7, and at this time, its pressing portion 8a is directed toward the other end 7b.

Next, a conventional fixed disk centering method using this centering means 5 will be explained.

First, the centering means 5 is fitted into a rotating shaft (not shown) installed in advance, and the other end 7b of the outer cylindrical portion of the centering means 5 is expanded (as shown in FIG. 8). When the other end 7b fills the hole 2 of the fixed disk 1, the fixed disk 1 is centered with respect to the rotation axis.

By this centering operation, the slit 3 of the fixed disk 1 is aligned with the slit of the rotating disk (not shown) supported on the rotating shaft.

After this centering, the fixed disk 1 is fixed to a housing (not shown) via the holding block 4, and the aperture member 8 of the centering means 5 is screwed toward the other end 7b to reduce the diameter of the other end. , the centering means 5 can be removed from the hole 2 of the fixed disk 1 and the rotation shaft.

C1 Problems to be Solved by the Invention By the way, in the conventional fixed disk centering method as described above, it is necessary to manually turn the throttle means 8 when performing centering, and furthermore, this manual turning operation is performed in a narrow space. It is complicated because it has to be done, and is one of the causes of lowering the workability of assembling the product.

Furthermore, when pulling out such conventional centering means 5 from the rotating shaft, if the other end 7b of the outer cylinder part 7 is not sufficiently squeezed, the outer cylinder part 7 will get caught on the fixed disk 1. In this case, the fixed disk 1 may be removed from the holding block 4, leading to a risk of product defects.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fixed disk centering method that can improve product assembly workability and prevent product defects.

d. Means for Solving the Problems In order to achieve the above object, the present invention provides a substantially cylindrical core having a rotating shaft insertion hole and having a plurality of protrusions formed on the outer circumferential surface. In addition to using a centering means, notches are formed in the hole of the fixed disk corresponding to the plurality of protrusions of the centering means, and the centering means is inserted through the rotating shaft, and the protrusions of the centering means are inserted. The centering means is inserted into the hole of the fixed disk in such a manner that it is positioned in the notch, and in this state, the centering means is rotated so that the tip of the protrusion of the centering means is inserted into the hole of the fixed disk. The fixed disk is brought into contact with the inner circular arc portion of the hole to center the fixed disk with respect to the rotating shaft.

e. Example Hereinafter, an example of the fixed disk centering method according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a motor 10 with an encoder 109 assembled using the method of the present invention.

FIG. 2 shows an embodiment of the centering means employed in the method of the invention.

The centering means 11 according to this embodiment has a substantially cylindrical shape,
It has a hole 13 having approximately the same diameter as the rotating shaft 12 in the center thereof, and three ridges 14 extending in the axial direction are formed on its outer peripheral surface.

The distal end surface 14a, which is the tip of the protrusion 14, has an arcuate cross section, and the valley surfaces 15, 15, 15 between the protrusions 14 have an arcuate cross section as well.

Corresponding to the shape of this centering means 11, the encoder 10
The hole 17 of the fixed disk 16 is as shown in FIG.
It consists of small-diameter inner circular arc portions 17a, 17a, 17a, and large-diameter circular arc-shaped notches 18, 18, and 18 formed at equal intervals.

Three slits 19 are formed in the fixed disk 16 partially around the hole 17.

The diameter of the circle formed by the inner arc portions 17a, 17a, +7a is the tip surface 14a, 14a of the centering means 11.
, 14a is approximately equal to the diameter of the circle formed by .

The fixed disk 16 is attached to the center of the upper surface of the substantially cylindrical holding block 20.

Next, the assembly of the encoder 10 using the fixed disk centering method according to the present invention will be described.

First, the fixed disk 16 fixed to the holding block 20 is fitted into the rotating shaft 12 protruding from the motor body 21,
Next, the centering means 11 is fitted onto the rotating shaft 12, and the centering means 11 is inserted into the fixed disk 1 in such a manner that the protrusion 14 of the centering means 11 is positioned within the notch 18 of the fixed disk 16.
1 (see Fig. 4).

After that, the centering means 11 is inserted into the hole 17 of the fixed disk 11.
The tip surface 14a of the centering means 11,
14a, 14a are aligned with the inner circular arc portions 17a, 17a, 17a of the hole 17 of the fixed disk 16 (see FIG. 5).

This alignment completes the centering of the fixed disk 16.

The fixed disk 16 has a pair of insertion holes 2 in the holding block 20.
It is fixed to the motor body 21 via the holding block 20 by screws 22 and 22 inserted through the holes 0a and 20a (see FIG. 1).

After fixing this holding block 20, the centering means 11 is again rotated in the hole 17 of the fixing disk 16, and when the protrusion 14 of the centering means is again located in the notch 18, the centering means 11 is rotated. Pull it out from the hole 17 of the fixed disc 6 and the rotating shaft 12.

Next, the holding part 24 that holds and fixes the rotating disk 23 is fitted into the rotating shaft 12, and when the distance between the rotating disk 23 and the fixed disk 1G is within a predetermined range, the holding part 24 is inserted into the rotating shaft 12.
is fixed to the rotating shaft 12 with a screw 25 (see FIG. 1).

Thereby, the fixed disk 16 and the rotating disk 23 are fixed to each other in a predetermined position.

Thereafter, the circuit board 27 is fixed on the holding plate 2o at a plurality of locations via screws 25 and spacers 26.

On both sides of this circuit board 27, electronic component groups 28, 29, 30, and 31 forming an electronic circuit related to the encoder 1° are arranged.

In the above embodiment, the centering means 11 has a shape having three protrusions 14, but the shape and number of the protrusions of the centering means according to the present invention are not particularly limited. The protrusion may be formed in any shape as long as the tip of the protrusion of the centering means can be brought into contact with the inner arc of the stationary disk to perform centering.

Therefore, the protrusion in the centering means is not limited to a ridge, but may be a simple protrusion, and the portions of the centering means and the fixed disk that do not come into contact with each other do not necessarily have to be arc-shaped. It is also possible to have a shape like this.

Further, the shape of the cutout of the hole in the fixed disk does not necessarily have to be arcuate, but it is sufficient if it is sufficiently thick to accommodate the protrusion of the centering means, and may be of any shape.

f. As described in detail, the fixed disk centering method according to the present invention uses a centering means that can be formed at low cost with a simple structure, and performs centering by slightly rotating the centering means. Since the centering means is pulled out from the rotating shaft by rotating it slightly, the centering work can be done easily and quickly even in a narrow space. With a little care, it is also possible to prevent the ejecting means from getting caught on the fixed disk.

Therefore, it is possible to further improve the workability of assembling a product that requires centering, and to prevent the occurrence of product defects.

[Brief explanation of drawings]

FIG. 1 is a front view showing, in cross section, the main parts of a motor equipped with an encoder assembled using the fixed disk centering method according to the present invention, and FIG. FIG. 3 is a perspective view showing an embodiment of the fixed disk employed in the method of the present invention; FIG.
5 and 5 are diagrams for explaining the present invention in detail, and FIGS. 6 and 7 show a fixed disk adopted in the conventional fixed disk centering method, and FIG. 6 is a perspective view thereof. , FIG. 7 is a plan view thereof, FIGS. 8 to 11 show a centering means adopted in the conventional method, FIG. 8 is a sectional view thereof, FIG. 9 is a bottom view thereof, and FIG. The figure is a cross-sectional view,
FIG. 11 is a bottom view thereof. 10... Encoder, 11... Centering means, 1
2... Rotating shaft, 13... Rotating shaft insertion hole, 1
4... Projection, 14a... Tip surface, 16.
... fixed disk, 17 ... hole, 17a ... inner circular arc part, 18 ... notch, 19 ... slot,
20... Holding block, 23... Rotating disk, 24... Rotating disk holding section. Patent applicant Oriental Motor Co., Ltd. (and 2 others) Figure 1 Figure 4 b Figure 5 q

Claims (1)

[Claims] A substantially cylindrical centering means having a rotating shaft insertion hole and a plurality of protrusions formed on the outer peripheral surface is used, and the plurality of protrusions of the centering means are accommodated in the hole of the fixed disk. forming a notch, and inserting the centering means into the hole of the fixed disk in such a manner that the centering means is inserted through the rotating shaft, and a protrusion of the centering means is positioned in the notch. In this state, the centering means is rotated so that the tip of the protrusion of the centering means comes into contact with the inner arc of the hole in the disk, thereby centering the fixed disk with respect to the rotating shaft. A fixed disk centering method characterized by: