JPS629022A - Spring bearing - Google Patents

Abstract

PURPOSE:To compose a compact bearing by connecting a rotary disk on one side to a junction disk by plate springs so as to be turnable each other within a range of small angle and connecting this junction disk to the other rotary disk by the second plate springs so as to be turnable each other within a range of small angle. CONSTITUTION:On the inside surface of a rotary disk 11, ends of the first plate springs 21 are fixed radially around the central axis, and the other ends of the plate springs 21, having been loosely inserted in the openings 14 on the disklike part 13 of a rotary disk 12, are fixed to the inside surface of a disklike junction disk 23 arranged inside the cylindrical connecting part 15 of the rotary disk 12 so that the rotary disk 11 and the junction disk 23 can be reciprocally turnable each other within a range of small angle. Further, the ends of plate springs 22 arranged radially are fixed to the junction disk 23, and the other ends are fixed to the disklike part 13 so that the junction disk 23 and the rotary disk 12 can be reciprocally turnable each other within a range of small angle. When the rotary disk 11 and 12 are relatively turned within a range of small angle, although they approch each other by the deformation of plate springs 21 and 22, however, they compensate each other, and the distance between the rotary disk 11 and the rotary disk 12 does not change.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a spring bearing for supporting a rotating body that rotates in a small angular range.

[Prior art] In order to support a rotating body that rotates reciprocatingly within a small angular range, it is more effective to support the rotating body with a leaf spring instead of using ball bearings, etc., as this avoids friction and rattling during one rotation. There are many.

FIG. 4 shows an example of this type of spring bearing that is commonly used. In the figure, 1.1 is a relatively rotating rotary disk, 2, 2. ... are radially arranged leaf springs that connect them, and these have a configuration that is an expanded torsion bar, reducing the rigidity around the rotation axis and increasing the rigidity in other directions, This is a bearing that supports rotation around the rotation axis.

However, such spring bearings have the following drawbacks.

(1) A pair of rotary disks 1 whose bearings become longer as the rotation angle increases
．． 1) decreases.

(2) Since the spring constant around the rotation axis needs to be as small as possible, the length of the leaf spring 2 cannot be made very short, making it difficult to make it compact.

(3) When the length of the leaf spring 2 changes due to thermal expansion due to temperature changes, the length of the bearing also changes.

[Problems to be Solved by the Invention] An object of the present invention is to provide a compact spring bearing that does not change in length during rotation or temperature changes and is short in the axial direction.

[Means for Solving the Problems] In order to achieve the above object, the spring bearing of the present invention has one rotary disk formed by a plurality of first leaf springs arranged in a radial direction around a central axis. The relay board is connected to the relay board so as to be rotatable within a small angle range, and the relay board is connected to the relay board by a plurality of second leaf springs arranged in a radial direction around the central axis. The rotary disc is connected to another rotary disc disposed close to the rotary disc between the rotary discs so as to be rotatable within a small angular range.

[Function] In the spring bearing having the above configuration, when the pair of rotary disks are rotated relative to each other, one rotary disk and the relay disk, and the relay disk and the other rotary disk approach each other while rotating relatively. do. However, since these approaches cancel each other out, changes in the distance between the pair of rotary disks are suppressed. Also,
Even if there is a temperature change, the thermal expansion of the pair of leaf springs is canceled out.

[Example] In FIGS. 1 to 3 showing examples of the present invention, 1
1.12 is a pair of rotary disks, and these rotary disks 11.
12 are configured to be able to rotate within a small angular range relative to each other by a mechanism described below.

The rotary disk 11 is configured in the shape of a disk, and the other rotating fi
12 is a plurality of openings 1 at radial positions around the central axis Jomon.
4,14. It is constituted by a disc-shaped part 13 in which ... is bored, a cylindrical connecting member 15 connected to the disc-shaped part 13, and a flange 1B connected to the end of the connecting member 15.

A plurality of first leaf springs 2 are provided on the inner surface of the rotary disk 11.
1,21. - and one end of which is fixed radially around the central axis Jomon, and the leaf springs 21, 21 .・The other end is
Disc in the other rotation @12! 3 aperture 14.1
4. After loosely inserting the cylindrical connecting member 1 of the rotary disk 12 into
It is fixed to the inner surface of the disc-shaped relay board 23 disposed in the rotary board 5, which allows one of the rotary discs 11 and the relay board 23 to rotate reciprocally within a small angular range relative to the central axis l. It is composed of

Further, the relay board 23 includes a plurality of second leaf springs 22, 22.・While fixing one end,
Those second leaf springs 22, 22 . ...Rotate the other end I
! It is fixed to the disc-shaped part 13 of l112, and the relay fIi23
and the rotary disk 12 are configured to be capable of reciprocating rotational movement within a small angular range.

Therefore, the pair of rotations @11, 12 is caused by the first and second leaf springs 21.2 in the folded state via the relay fi23.
2, each leaf spring 21
, 22 themselves are relatively short, the pair of rotating discs 11
．． The spring constant between 12 and 12 can be reduced.

In the spring bearing with the above configuration, for example, one rotary disk 1
1 and the other rotation m]2 relative to each other in a small angular range, the first leaf spring 21.21.

... and second leaf springs 22, 22.・Since the life is transformed into a state where the entire body is twisted, one rotation @ 11, relay board 23
and the other rotary disk 12 rotate relative to each other in the same direction. In this case, one rotary disk 11 and relay a
23, and the rotation m12 of the relay plate 23 and the other side will approach each other due to the deformation of the first and second leaf springs, but these approaches will cancel each other out between the rotating plates 11 and 12. Therefore, by choosing the characteristics of the leaf springs so that the amount of approach is the same, the distance between the rotary disks 11 and 12 does not change.

In addition, the first and second leaf springs 21 and 22 are configured to have approximately the same length and are made of members having the same coefficient of thermal expansion, so that their thermal expansion is as equal as possible. It is also possible to eliminate the influence of

That is, when a temperature change occurs, the leaf springs 21 and 22 expand and contract, and the distances between one rotating disk 11 and the relay disk 23, and between the relay@23 and the other rotating m12 change, respectively.
Since the thermal expansions of the second leaf springs 21 and 22 are substantially the same, changes in the distance between the pair of rotary disks 11 and 12 are canceled out.

[Effects of the Invention] As described above, according to the present invention, it is possible to suppress the change in the distance between the pair of rotary discs when the two rotary discs rotate and when they thermally expand due to temperature changes, and the distance between the first and second discs can be suppressed. Since the spring is folded back via the relay board, the product can be provided as a compact product that is short in the axial direction.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention. FIG. 1 is a sectional view taken along the line II-II in FIG. 3, and FIGS. A sectional view taken along the line 1--2, and FIG. 4 is a perspective view of the conventional example. 11.12... Rotating disk, 21,22... Leaf spring, 2
3. Relay board. Figure 1 Figure 2 Figure 3 ■] Figure 4

Claims (1)

[Claims] 1. One rotary disk is connected to the relay board so that it can rotate within a small angular range with respect to the relay board by a plurality of first leaf springs arranged in a radial direction around the central axis, and this relay board is
A plurality of second
A spring bearing, characterized in that the relay board and the rotary disc are connected to another rotary disc disposed close to the rotary disc between the relay board and the rotary disc so as to be rotatable within a small angular range.