JPS63210426A - Annular leaf spring - Google Patents

Abstract

PURPOSE:To facilitate the automation of motor, etc. by allowing a cut part formed at the position in parallel or at right angles to the center line of a circular opening on the outer or inner periphery to be engaged with a guide and superposing a plurality of leaf springs. CONSTITUTION:A leaf spring having a shim or washer form is applied with a circular opening, and an annular leaf spring having a cut part 15 or 16 at the position in parallel or at right angles with the center line of the circular arc on the inner or outer periphery is used. Projecting guides 22A, 22B, 32A, and 32B which are engaged with the cut parts and position the leaf springs in a certain direction are installed onto the holders 20 and 30 which hold several leaf springs superposed, and taking-out of the annular leaf spring from the holders 20 and 30 and fitting onto a rotor shaft, etc. can be automated, and the deformation of the leaf spring during the time when the leaf spring is held in the superposed state onto the holders 20 and 30 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an annular leaf spring used to remove axial backlash of a rotating body when the shaft of the rotating body is supported by a bearing.

[Prior Art] In small motors, generators, etc., a structure is adopted in which a shaft protruding from both ends of a rotor (rotor) is rotatably supported by bearings fixed to a case or the like.

In such a rotor shaft support structure, the rotor and An annular leaf spring is often fitted between the bearing and the bearing.

FIG. 7 shows the structure of a step motor, which is an example of a device in which the annular leaf spring is used.

In Fig. 7, ■ is a rotor shaft, 2a and 2b are bearings that support the shaft 1, 3 is a board for mounting the motor, 4a and 4b are yokes configured as stators, and 5a and 5b are held within the yoke. 6a and 6b are excitation coils wound around each bobbin, 7 is an outer case, 8 is a rotor magnet whose periphery is magnetized with multiple poles, and 9 is between the end face of the rotor magnet and the bearings 2a and 2b. washer attached to l
O indicates an annular leaf spring for removing the axial backlash of the rotor magnet 8, respectively.

In other words, in the case of a structure in which the shaft portion l of a rotating body 8 such as a motor such as a stator motor is supported by bearings 2a and 2b, the dimension between the bearings 2a and 2b should be slightly larger than the length of the rotating body 8. However, the gap therebetween is adjusted to an appropriate amount using a washer 9, and the axial play between the bearings 2a, 2b and the rotating body 8 is removed using the annular leaf spring.

If there is any play between the rotor 8 and the bearings 2a, 2b, the length of the output shaft may change due to changes in the attitude of the motor, etc., and vibrations during rotation of the motor, etc. may pass through the bearings 2a, 2b, causing the mounting plate 3 The above-mentioned annular leaf spring 10 is used to prevent such a phenomenon.

The aforementioned annular leaf spring 10 is generally made of spring materials such as phosphor bronze, spring steel, or beryllium copper. It is installed in

On the other hand, for small motors and generators, there is a strong demand for automatic assembly to improve productivity, and stators (yokes) 4a, 4
Components such as bearings 2a and 2b can be relatively easily and automatically assembled, and automatic assembly has already been carried out.

Also, if the washers 9 have the same diameter and the same thickness, a large number of washers 9 can be attached to the holder 11 as shown in FIG.
Automatic assembly is possible by stacking the sheets in a stack and taking them out one by one from the bottom.

9 and 10 respectively show a conventional annular leaf spring 10.
The shape of is exemplified.

In FIG. 9, (A) is a plan view of the leaf spring lO, and (B)
is a side view seen from line BB in (A), and (C) is a side view seen from line CC in A.

The annular leaf spring shown in FIG. 9 is formed into a wave shape along the circumferential direction.

In FIG. 10, (A) is a plan view of a conventional temporary spring having another shape, and CB> is a sectional view taken along line BB in (A).

The annular leaf spring shown in FIG. 10 has an arcuate shape.

However, in the case of the leaf spring shown in Fig. 9, when multiple sheets are stacked, the waveforms match each other as shown in Fig. 11. It is difficult to calculate the number of blocks in arithmetic, and on the other hand, it is difficult to calculate the 12th number when a large number of boards are piled up in Figure 10.
As shown in the figure, the deformation occurs, making it even more difficult to take it out from under the holder 11 as shown in Figure 8, which is an obstacle to automatic assembly.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to provide an annular leaf spring that can solve the problems of the prior art described above, is easy to take out and mount automatically, and is advantageous for automatic assembly of motors and the like.

[Means to achieve the purpose]

The present invention has an arcuate warped shape, a notch is formed on the outer periphery or the inner periphery at a position parallel or perpendicular to the center line of the circular arc, and the plurality of stacked pieces are stacked by engaging the notch with a guide. By positioning the leaf springs in a certain direction,
This aims to achieve the above objectives.

〔Example〕

The present invention will be specifically explained below with reference to FIGS. 1 to 6.

FIG. 1 shows a first embodiment 10A of an annular leaf spring according to the present invention, in which (A) is a plan view thereof, and (B) is a sectional view taken along line B-H in (A).

The annular leaf spring IOA shown in FIG.
．． 15 is formed.

The positions of the notches 15.15 are selected on both sides of the center line of the arcuate warp, that is, at right angles to the center line.

FIG. 5 shows a holder 20 for stacking and holding a plurality of leaf springs IOA shown in FIG. 1 and for taking out one or more leaf springs from below one by one.

This holder 20 is formed with a cylindrical hole 21 for accommodating a plurality of leaf springs IOA, and the inner surface of the cylindrical hole 21 is provided with a plurality of leaf springs IOA.
A protruding guide 2 that engages with the notch 15.15 of the OA and positions the stacked plurality of leaf springs IOA in a certain direction.
2A and 22A are formed.

Further, the lower end surface of the holder 20 has an arcuate shape 23 matching the arcuate warpage of the leaf spring IOA, and is configured to allow a desired number of leaf springs to be taken out from below by sliding them laterally.

FIG. 2 shows a second embodiment 10B of an annular leaf spring according to the present invention, in which (A) is a plan view thereof, and (B) is a sectional view taken along line BB in (A).

The annular leaf spring IOB in FIG. 2 has an arcuate shape, and a notch 15.15 is formed on its outer periphery at a position parallel to the center line of the arcuate warp.

That is, the leaf spring IOB shown in FIG. 2 differs from the first embodiment shown in FIG. 1 only in that the position of the notch 15.15 is selected to be parallel to the arc center line.

As a holder for stacking and holding a plurality of leaf springs IOB in FIG. , and use a holder with substantially the same structure in other respects.

FIG. 3 shows a third embodiment 10C of an annular leaf spring according to the present invention, in which (A) is a plan view thereof, and (B) is a sectional view taken along line B-H in (A).

The annular leaf spring IOC shown in FIG.
．． 16 are formed. In this third embodiment, the positions of the notches 16.16 are selected on both sides of the center line of the arc of warp of the leaf spring 10C, that is, at positions perpendicular to the center line.

FIG. 6 shows a holder 30 for stacking and holding a plurality of leaf springs IOC shown in FIG. 3 and for taking out a predetermined number of leaf springs from below.

This holder 30 is formed with a cylindrical surface 31 through which the inner diameters of the plurality of leaf springs IOC are inserted, and the notches 16 and 16 of the leaf springs IOC are engaged with the cylindrical surface 31, and the plurality of stacked leaf springs IOC are engaged with the cylindrical surface 31. Protruding guides 32A, 32A are formed to position the parts in a certain direction.

Further, an arc shape 33 matching the warped arc of the leaf spring IOC is formed on the lower end surface of the holder 30, and the structure is such that a predetermined number of leaf springs 10C can be taken out by sliding in the lateral direction from the bottom of the holder 30. ing.

FIG. 4 shows a fourth embodiment 10D of an annular leaf spring according to the present invention, in which (A) is a plan view thereof, and (B) is a sectional view taken along line BB in (A).

The annular leaf spring IOD shown in FIG. 4 has an arcuate shape, and a notch 16.16 is formed in the inner diameter (inner periphery) of the annular leaf spring IOD at a position parallel to the center line of the warped arc.

That is, the leaf spring lOD shown in FIG. 4 is different from the third embodiment shown in FIG. 3 in that the positions of the notches 16 and 16 are selected to be parallel to the center line of the warped arc, and other points are included. have virtually the same structure.

As a holder for stacking a plurality of leaf springs 10I) shown in FIG. 4 and taking out a predetermined number of leaf springs from below, the above-mentioned notch 16.
The position of the protruding guide to be engaged with 16 is indicated by solid lines 32A, 3
Two-dot chain line 32B, 3 shifted 90 degrees from the position shown by 2A
What is necessary is to use the one changed to the position shown by 2B.

According to the embodiment described above with reference to FIGS. 1 to 6,
A shim or washer-like leaf spring is given an arc-shaped warp (deformation), and a notch 15 or 1 is provided on the outer or inner periphery of the leaf spring at a position parallel or perpendicular to the center line of the arc.
6 is used, and a holder 20.30 that holds a plurality of leaf springs in a stacked manner has a protruding shape that engages with the notch and positions each leaf spring in a certain direction. Since guides 22A, 22B, 32A, and 32B were provided,
Taking out the annular leaf spring from the holder 20.30 and fitting it onto the rotor shaft etc. can be easily automated,
Furthermore, it is now possible to prevent the leaf springs from being deformed (distorted) while being stacked and held in the holders 20, 30.

Furthermore, since the lower end surface of the holder 20.30 is shaped into an arc opposite to the warped arc of the leaf spring, the holder 20.30 of the slope spring
It has become possible to improve the holding function at 0.30 and also to accurately and smoothly take out a predetermined number of slope springs from below.

Note that in each of the above embodiments, the notches 15 or 16 of the leaf spring and the holder 20 that is engaged with these notches are
．． 30 protruding guides 22A (22B) or 32A (3
2B) are provided at two locations facing each other at 180 degrees, but these may be provided at one location on the circumference, or may be provided at three or more locations.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it has an arcuate warped shape, and a notch is formed on the outer or inner periphery at a position parallel or perpendicular to the center line of the arc. Since multiple stacked leaf springs are positioned in a certain direction by engaging with the guide, it is possible to easily take out a predetermined number of leaf springs stacked and held in a holder, etc. and attach them to a motor, etc., which facilitates automatic assembly of motors, etc. Provided is an annular leaf spring that is advantageous for application.

[Brief explanation of the drawing]

1A and 1B are a plan view and a sectional view of a first embodiment of an annular leaf spring according to the present invention, and FIGS. 2A and 2B are a first embodiment of an annular leaf spring according to the present invention. A plan view and a sectional view of the second embodiment, and FIGS. 3A and 3B are a plan view and a sectional view of the third embodiment of the annular leaf spring according to the present invention, and FIGS. ) are a plan view and a sectional view of a fourth embodiment of the annular leaf spring according to the present invention, FIG. 5 is a perspective view of the holder of the annular leaf spring of FIG. 1 or 2, and fjS
6 is a perspective view of a holder for the annular leaf spring of FIG. 3 or 4, FIG. 7 is a vertical sectional view of a motor suitable for using the annular leaf spring according to the present invention, and FIG. 8 is a conventional washer. Vertical cross-sectional views of the holder, (A), (B), and (
C) is a plan view, a side view, and a sectional view showing one example of a conventional annular leaf spring, and (A) and (B) in FIG. 1O are a plan view and a sectional view showing another example of a conventional annular leaf spring. , FIG. 11 is a schematic diagram illustrating the overlapping state of the leaf springs in FIG.
FIG. 2 is a schematic diagram illustrating a modification of the leaf spring shown in FIG. 10. 10A, 10B, I OC, 10D, ---・---
・Annular leaf spring, 15.16-...notch, 20.
30-1...-Holder, 22A, 22B, 32A,
32B...--Guide, 23.33--...
- Arc shape of the lower end of the holder. Agent Patent Attorney Yasushi OotoFigure 8Figure 9\;≧7-2-1≦\

Claims (1)

[Claims] (1) It has an arcuate warped shape, and a notch is formed on the outer or inner periphery at a position parallel or perpendicular to the center line of the arc, and by engaging the notch with a guide, a plurality of stacked An annular leaf spring characterized by positioning the leaf spring in a certain direction.