JPS62106123A - Elastic bearing - Google Patents

Abstract

PURPOSE:To improve the accuracy of rotation of a rotating shaft by providing the No.3 engaging hole on the bearing body and the No.2 engaging holes on both ends of a rotating shaft and connecting the other end of a receiver provided with the No.1 engaging hole to the bearing body by means of a plate spring, and then inserting the No.1 and No.2 spheres into the Nos. 1, 2 and the Nos. 2, 3 engaging holes respectively. CONSTITUTION:The 1, 2 plate springs 2, 5, on the middle part of which are provided cross-shaped spring eyes 3, 6, are attached to the bearing body 1 by means of internal and external spacers 4a, 4b and an external tension plate 8, and then, a receiver 14 with the No.1 engaging hole 15 formed in a conical shape is attached to the body 1. On the other hand, a rotating shaft 16, on both ends of which are provided the No.2 engaging holes 17 formed in a conical shape is placed between the body 1 and the receiver 14 with the aid of the Nos. 1, 2 spheres 18, 21 which are inserted into the Nos. 1, 2 engaging holes 15, 17 on the receiver 14 side and the Nos. 2, 3 engaging holes 17, 19 on the bearing body side. Thereby, the rotating shaft 16 is supported in such a manner that there is no play in both thrust direction and radial direction, and accordingly, the accuracy of its rotation can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an elastic bearing that rotatably supports a rotating shaft.

[Technical background of the invention and its problems]

For example, in a robot, an arm is rotatably provided on the main body of the robot, and the rotation angle of this arm is sometimes closely controlled. In such a case, the structure is such that a rotating shaft is rotatably attached to the main body using a bearing, and the arm is attached to the rotating shaft.

Conventionally, ball bearings, roller bearings, and the like are known as bearings that rotatably support a rotating shaft. These conventional bearings have an inner ring and an outer ring, with balls or rollers interposed between them. The outer ring is attached to the main body, and the rotating shaft is supported by the inner ring.

However, in a bearing having such a structure, because of the structure in which the poles and rollers are interposed between the inner ring and the outer ring, it is inevitable that there will be a gap between the inner ring and the outer ring. Therefore, since the rotating shaft supported by the inner ring also has some play in the radial direction with respect to the outer ring, there is a drawback that the arm attached to this rotating shaft cannot be rotated with high precision. .

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an elastic bearing that can rotatably support a rotating shaft with high precision without causing play in the radial direction.

[Summary of the invention]

In this invention, a leaf spring is attached to one end of the main body, a receiver is attached by joining one end face to the leaf spring, and a conical first engagement hole is formed in the other end face of the receiver. In addition, a first engagement hole is provided between one second engagement hole of the rotating shaft, which has conical second engagement holes formed on both axial end faces, and the first engagement hole of the receiver. A second sphere is provided between the second engagement hole on the other side of the rotating shaft and a third conical engagement hole formed on the other end side of the main body, and by these spheres, The rotating shaft is rotatably supported.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. The elastic bearing shown in FIG. 1 includes a main body 1 with an open top surface and one end surface.

A first leaf spring 2 having substantially the same rectangular shape as this end surface is joined to one open end surface of the main body 1. This first leaf spring 2 has a cross-shaped spring portion 3 formed in its center. A second leaf spring 5 is joined to the outer surface of the first leaf spring 2 via an internal spacer 4a and an external spacer 4b in parallel to the first root spring 3. Similar to the first leaf spring 2, this second leaf spring 5 also has a cross-shaped spring portion 6 formed in its center, and an internal presser piece 7 and an external presser piece 8 are joined to the outer surface of the cross-shaped spring portion 6. There is (4th
(see figure). Four corners of each leaf spring 2.5, external spacer 4b
and external mounting is provided with the first one at the corresponding position on piece 8.
A through hole 9 is bored through the spring portion 3.6 of each leaf spring 2.5,
Second through holes 11 are bored in the internal spacer 4a and the internal presser piece 7 at corresponding positions, respectively (see FIG. 3).

First screws 12 are inserted through the first through holes 9, and these first screws 12 are screwed into the ends of the main body 1 (see FIG. 2). Therefore, the first and second leaf springs 2.5 are attached and fixed to the main body 1 by the first screws 12. A second screw 13 is inserted through the second through hole 11 . The end of this second screw 13 is
protrudes toward the inner surface of the leaf spring 2, and a receiver 14 is screwed into the end thereof. That is, the receiver 14 is attached to the inner surface of the first leaf spring 2 with one end surface joined.

A conical first engagement hole 15 is formed in the other end surface of the receiver 14, and a rotating shaft 16 is rotatably supported between this other end surface and the inner surface of the other end of the main body 1. . That is, conical second engagement holes 17 are formed in both axial end surfaces of the rotating shaft 16, respectively. A first sphere 18 is interposed between one second engagement hole 17 and the first engagement hole 15 . Further, a conical third portion is provided on the inner surface of the other end of the main body 1.
An engagement hole 19 is formed, and a second sphere 21 is interposed between this third engagement hole 19 and the other second engagement hole 17 of the rotating shaft 16 . That is, the rotating wheel 16 is rotatably supported in the radial direction by the first and second spheres 18.21, and is supported by the elastic force of the first and second leaf springs 2.5 as shown in FIG. It is biased in the thrust direction and is prevented from being displaced in the thrust direction.

Further, one end of a U-shaped arm 22 is fitted onto the rotating shaft 16. The other end of the arm 22 is located outside the main body 1, and a hand (not shown), for example, is attached to the other end located on an extension of the axis of the rotating shaft 16.

According to the elastic bearing having such a structure, the rotating shaft 16 is rotatably supported by the first and second spheres 18.21 via both end surfaces in the thrust direction, and the first and second leaf springs 2.5, it is elastically biased in the thrust direction. Therefore, the rotating shaft 16 is supported without play in both the radial direction and the thrust direction. Furthermore, when a radial load is applied to the rotating shaft 16 via the arm 22, a moment generated by the load acts on the first and second leaf springs 2.5. However, since the first and second leaf springs 2.5 are mounted and fixed to the main body 1 in a parallel manner and spaced apart, these leaf springs 2.5 are likely to be twisted by the above-mentioned moment. Therefore, the rotating shaft 16 is only likely to be displaced in the radial direction due to the moment received from the arm 22. In other words, the rotating shaft 16 can rotate the arm 22 with high precision.

Although the above embodiment uses two leaf springs, the number of springs that can be used is not limited in any way.

〔Effect of the invention〕

As described above, the present invention rotatably supports a rotating shaft by a sphere through conical engagement holes formed on both end faces in the axial direction, and the supported state is elastically applied by a leaf spring. I tried to strengthen it. Therefore, since the rotating shaft is supported without play in both the thrust direction and the radial direction, the rotation accuracy can be greatly improved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a cross-sectional view showing the state in which the rotating shaft is supported, Fig. 2 is a side view taken along line If-It in Fig. 1, and Fig. 3 is a plane view of the leaf spring. FIG. 4 is a perspective view of the whole. DESCRIPTION OF SYMBOLS 1... Main body, 2... First leaf spring, 5... Second temporary spring, 14... Receiver, 15... First engagement hole, 1
7... Second engagement hole, 18... First sphere, 19...
...Third engagement hole, 21...Second sphere. Applicant's agent Patent attorney Takehiko Suzue rI [Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) A main body, a plate spring attached to one end of the main body, and a receiver attached to the plate spring with one end surface joined and a conical first engagement hole formed in the other end surface. body and
A rotating shaft in which conical second engagement holes are formed on both end faces in the axial direction, and a second engagement hole in one end face of the rotating shaft and a first engagement hole in the receiver. a first spherical body provided therebetween, a second engagement hole on the other end surface of the rotating shaft, and a third conical engagement hole formed on the other end side of the main body; 1. An elastic bearing comprising: a first spherical body; and a second spherical body rotatably supporting the rotating shaft. (2) The receiver is attached to one of a plurality of leaf springs that are integrally provided in parallel and facing each other with a spacer in between. Elastic bearings as described in section.