JPS62255611A - Elastic bearing - Google Patents

Abstract

PURPOSE:To prevent loseness and eccentricity of a rotary shaft by elastically energizing the rotary shaft with a plate spring and moving the rotary shaft in the direction of a thrust by means of an adjusting screw. CONSTITUTION:A rotary shaft 21 is energized in the direction of a thrust by means of elastic force of a plate spring 12 and stopped from being moved in the direction of the thrust, while the rotary shaft 21 is notably supported in the radial direction by means of a first ball 23 and a second ball 25. And the rotary shaft 21 is supported in both the radial and the thrust directions without looseness and an arm 26 is rotated with high precision. Further, the rotary shaft 21 energized by reaction force of the plate spring 12 can be moved in the thrust direction with the help of advance and regression of an adjusting screw 28. Accordingly, thrust is adjusted by the plate spring 12 by means of moving said rotary shaft 21 in the thrust direction, and so looseness and eccentricity can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an elastic bearing that rotatably supports a rotary shaft for supporting, for example, a robot arm.

(Prior Art) Conventionally, sliding bearings and rolling bearings have been mainly used as single-rotation bearings. Sliding bearings have a sliding surface on the inner surface of a shaft hole that is larger than the shaft diameter of the rotating shaft, and it was necessary to strictly specify the rotating shaft shaft diameter and sliding surface inner diameter to reduce radial play and eccentricity. In addition, rolling bearings are characterized by the rolling elements (spherical, 9 cylindrical, etc.) sandwiched between the inner and outer rings that move in accordance with the inner ring. It was necessary to specify.

Although it has not been released to the public in order to solve the above problems.

The present applicant has applied for an elastic bearing that utilizes the reaction force of a leaf spring (Japanese Patent Application No. 60-242619). To explain the above prior art as shown in FIG. A conical first
An engagement hole 4 is formed therein. Further, conical second engagement holes 6, 6 are provided on both axial end faces of the one-rotation shaft 5, and one of the second engagement holes 6 of the one-rotation shaft 5 and the first engagement hole of the receiver 3 are connected to each other. A first spherical body 7 is provided between the mating hole 4 and the other second engaging hole 6 of the rotating shaft 5 and a conical third engaging hole formed on the other end side of the main body 1. A second sphere 9 is provided between the
These spheres A and 9 rotatably support the rotating shaft 5.

The rotating shaft 5 is supported by the urging force of the leaf spring 2 in the thrust direction, thereby preventing backlash in both the thrust direction and the radial direction.

Therefore, the elastic bearing configured as described above.

The rotary shaft can be supported in a highly precise and rotatable manner without any play in the radial direction, but since the single rotation shaft is supported on both end faces in the axial direction, high precision in the dimensions in the thrust direction is required. be done.

(Problems to be Solved by the Invention) This invention has been made in view of the above-mentioned circumstances, and provides for a rotating shaft that can be easily assembled and processed with high precision, and that can be supported rotatably in the radial direction without causing play in the rotating shaft. The purpose is to provide an elastic bearing that can.

[Structure of the invention]

(Means for Solving the Problems) This invention includes a plate spring attached to one end of a main body, one end face of the plate spring joined to a receiver, and a conical shape attached to the other end face of the receiver. A first engagement hole is formed in the rotary shaft, and conical second engagement holes are formed in both axial end faces of the rotary shaft. A first spherical body is provided between the mating hole, a screw hole is provided in the main body facing the other end surface of the rotating shaft, and a third conical body is provided on the tip surface of the adjustment screw screwed into the screw hole. A retaining hole is formed, and a second spherical body is provided between the second engagement hole and the third engagement hole, and the rotating shaft is rotatably supported by these spherical bodies. be.

(Function) Due to the reaction force caused by the deflection of the leaf spring, the rotating shaft is supported so as to be able to rotate two times through the second sphere and guided by the third conical engagement hole provided in the adjustment screw. By advancing and retracting the thrust force, the thrust force is adjusted and looseness and eccentricity are removed.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2. In Fig. 1, 11 is the main body of the elastic bearing;
The main body 11 has an open top surface and one end surface. A screw hole 27 is bored through the side wall of the main body 11 on the side opposite to the release side. A leaf spring 12 having a rectangular shape substantially the same as this end surface is joined to one open end surface of the main body 11. An internal presser piece 19 and an external presser piece 14 are joined to the outer surface of the leaf spring 12. First through holes 15 are bored at corresponding positions in the four corners of the leaf spring 12 and the external holding piece 14, respectively, and first through holes 15 are bored at corresponding positions in the central part of the leaf spring 12 and the internal holding piece 19, respectively. A second through hole 16 is bored in the hole. First screws 17 are inserted through the first through holes 15, and these first screws 17 are screwed into the end surface of the main body 11.

Therefore, the leaf spring 12 is fixed to the main body 11 by the first screw 17. The second through hole 16
A second screw 18 is inserted through. The end of the second screw 18 projects toward the inner surface of the leaf spring 12, and the receiver 13 is screwed into the end. That is, the receiver 13 is attached to the inner surface of the leaf spring 12 with one end surface joined and faces the screw hole 27 . A conical first engagement hole 20 is formed in the other end surface of the receiver 13. Further, an adjustment screw 28 having a conical third engagement hole 24 at its tip end is screwed into the screw hole 27 provided on the other end surface of the main body 11 so as to be freely forward and backward. Further, a rotary shaft 21 is rotatably supported between a first engagement hole 20 provided in the receiver 13 and a third engagement hole 24 provided in the adjustment screw 28. That is, conical second engagement holes 22 are formed in both axial end surfaces of the one-rotation shaft 21, respectively. A first sphere 23 is interposed between one of the second engagement holes 22 and the first engagement hole 20 . Further, a second spherical body 25 is interposed between the third engagement hole 24 formed on the tip surface of the adjustment screw 28 and the other second engagement hole 22 of the rotating shaft 21 . That is, the rotating shaft 21 is the first. It is rotatably supported in the radial direction by the second spheres 23, 25, and is biased in the thrust direction by the elastic force of the leaf spring 12, thereby preventing displacement in the thrust direction.

Further, the rotating shaft 21 is as shown in FIG.

One end of a trowel-shaped arm 26 is fitted. The other end of the arm 26 is located outside the main body 11; for example, a handle (not shown) is attached to the other end located on an extension of the axis of the rotating shaft 21.

In the elastic bearing having such a structure, the rotating shaft 21 is supported without play in both the radial direction and the thrust direction, thereby allowing the arm 26 to rotate with high precision. Also.

By moving the adjusting screw 28 forward and backward, the rotating shaft 21 urged by the reaction force of the leaf spring 12 can be moved in the thrust direction. By moving this rotating shaft 21 in the thrust direction, the thrust force exerted by the leaf spring 12 can be adjusted.

Note that in the above embodiment, one leaf spring was used.

The number, shape, and shape of the main body of the leaf springs are not limited at all.

〔Effect of the invention〕

As described above, the present invention rotatably supports a one-rotation 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. The rotating shaft can be moved in the thrust direction using an adjustment screw. Therefore, the rotating shaft can rotate with high precision without causing backlash or eccentricity, and the thrust force can be adjusted depending on the workpiece and the driving source. In addition, there is no need to strictly specify dimensions in the thrust direction, allowing for 9 assemblies.

Processing can be performed easily.

[Brief explanation of drawings]

FIGS. 1 and 2 show an embodiment of the present invention, and FIG. 1 is a cross-sectional view showing a state in which a rotating shaft is supported. FIG. 2 is an overall perspective view, and FIG. 3 is a cross-sectional view showing how the rotating shaft is supported in the prior art. ii., Main body, 12. ,, leaf spring, 13. ,. receptor, 20. ,,first engagement hole,21. ,, rotation axis, 2
2. , second engagement hole, 23. ,,first sphere,24.
,, third engagement hole, 25. ,, second sphere, 27. ,,
Screw hole, 28. ,,adjust it. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] a main body, a leaf spring attached to one end of the main body, a receiver attached to the leaf spring and having a conical first engagement hole on the end face, and a second conical engagement hole on both axial end faces, respectively. a rotating shaft in which an engaging hole is formed; a first engaging hole provided between one second engaging hole of the rotating shaft and the first engaging hole of the receiver;
a spherical body, a screw hole provided in the main body opposite to the other end surface of the rotation shaft, and an adjustment screw screwed into the screw hole so as to be freely retractable and having a conical third engagement hole at the tip thereof. , further comprising a second spherical body that rotatably supports the rotating shaft with the first spherical body provided between the second engagement hole and the third engagement hole. elastic bearing.