JPS58191319A - Middle low speed no-lubrication bearing device - Google Patents

Abstract

PURPOSE:To provide a no-lubrication bearing excellent in lasting quality by bringing a wavy bush formed of an inorganic material into loose contact between a movable portion and a fixed portion, each outermost layer surface of which is formed of a synthetic resin material. CONSTITUTION:A lining of a synthetic resin is applied to the outermost layer portion 2 of a fixed portion 1 and the outermost layer portion 4 of a movable portion in a bearing device. A wavy bush 5 formed of a metallic material or an inorganic material having continuous projections 6 and 7 projected alternately in the opposite direction and a slit 8 is mounted in a vacant space between the outermost portion 2 of the fixed portion 1 and the outermost portion 4 of the movable portion 3. The coefficient of friction between such materials of different kinds is extremely small so that the lasting quality of the bearing device is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to solve the problems such as the need for lubricants in metal ball bearings or the premature wear and breakage in synthetic resin bearings. Focusing on the fact that the coefficient of friction between the material and the synthetic resin material is extremely small, that is, the self-lubricating effect of the synthetic resin material itself occurs between such dissimilar materials, we have developed a method for improving durability without lubrication. This is an excellent bearing device developed.

In this invention, a bushing made of an inorganic material such as a metal material or a ceramic material is freely interposed between a movable part and a fixed part in a bearing device such as a radial bearing or a thrust bearing made of a synthetic resin material. This is the first feature.

The bushing does not simply slide between the movable part and the fixed part by surface contact, but by utilizing the effect of reducing the friction area due to the focal plane contact of the balls in the ball bearing, the bushing is moved over the entire surface of the bushing. K. ``The bush is arranged with various protrusion patterns and has slits in it, and this structure, together with the elastic pivoting effect, ensures continuous and uniform load distribution during use. The second feature is to measure the

Next, embodiments of the present invention will be described in detail with reference to the drawings.

First, regarding the radial bearing shown in Fig. 1, the member corresponding to the outer ring in a normal ball Y-ring is the fixed part L, and the member corresponding to the inner ring and the rotating shaft inserted therein are collectively called the movable part. This will be generally explained as 3.

A circular hole is opened in the fixed part l of the bearing device made of metal material,
Its peripheral surface is lined with synthetic resin to form a surface layer 2, and the outer peripheral surface of the movable part 3 of the bearing device made of a metal material is also lined with synthetic resin to form a surface layer 4. shall be kept.

On the other hand, continuous outward protrusions 6 and inward protrusions 7 facing oppositely in the radial direction have a wavy protrusion pattern extending through the width direction of the plate-like body, and slits 8 are formed. A radial bearing is constructed by attaching a bushing 5 made of a metal material or an inorganic material such as ceramic to the gap between the surface layer 2 of the fixed portion 1 and the surface layer 4 of the movable portion 30 in the bearing device.

When attaching the bushing 5, as shown in FIG. 2, the corrugated bushing 5, which is initially bulged by pressing the outward protrusion 6 and the inward protrusion 7 on the plate-like body 9, is bent to form a substantially annular shape. By attaching the bushing 50 to the gap between the fixed part 1 and the movable part 3 of the bearing device with both edges in contact with each other so as to form an angle, the both edges of the bushing 50 are elastically separated to form a slit 8.

When the pusher 5 is attached, since elasticity acts on the entire pusher 5, the top surfaces of the adjacent outward protrusions 6 form an envelope H cylinder and the inner periphery of the surface layer 2 of the fixing part l. Similarly, each top surface of the adjacent inward projections 7 uniformly contacts the outer circumferential surface of the surface layer 4 of the movable portion 3 .

When using this radial bearing, as the movable part 3 rotates under load, the load is transmitted from the inward protrusion 7 to the lower part of the fixed part l at the lower part of the bushing 5 via the outward protrusion 6, and at the same time Tension is simultaneously transmitted alternately and sequentially to the inwardly directed protrusions 7 and outwardly directed protrusions 6, and the slit 8 becomes smaller and the rotating shaft [slides] in the balanced state.
The white bush 5 slides accordingly and moves freely between the fixed part 1 and the movable part 3, producing a sour odor effect on the rotating shaft.

The bushing 5 is made of a metal material or an inorganic material such as ceramic, while the contact surfaces of the fixed part 1 and the movable part 3 that come into contact with the bushing 5 are both made of synthetic resin material. The coefficient of friction between different materials is extremely small, and the self-lubricating bearing device has extremely high durability.

In this embodiment, the fixed part l and the movable part 3 are made of a metal material, and the contact part of the bushing 5 is lined with a synthetic resin material, but the entire part is made of a synthetic resin material without using a metal material. Even in the case where it is used, these functions and effects are achieved in exactly the same way.

Regarding the shape of the bush 5, the cross-sectional shapes of the outward protrusions 61 and the inward protrusions 7 and the protrusion patterns on the inner and outer surfaces of the bush can be freely selected.

Next, specific examples of such various kinds of nuts will be explained with reference to FIGS. 3 to 8.

Note that the reference symbols in FIG. 2 will be used for the same components as the bushing in FIG. 2.

In the example shown in FIG. 3, only one side of the plate-shaped body 9 is bulged from the reference surface to form an outward projection 6 similar to the bush 5 shown in FIG. 2, and an inward projection 7 in FIG. It is characterized by a shape in which a flat reference surface remains without forming a flat reference surface, and this remaining flat reference surface itself comes into elastic contact with the movable part 3 of the bearing device, and has exactly the same operation and effect as the previous embodiment. It is something to play.

The bush shown in FIG. 1 includes an outward projection 6 and an inward projection 7.
The bushing bulges in the plane of the plate-like body 9 in the width direction (r1), and differs from the bushing shown in FIG. 2 only in that it does not penetrate in the width direction.

The bushes shown in FIGS. 5 and 6 have a protrusion pattern that bulges out from the reference surface of the plate-shaped body 9 only on one side and does not penetrate in the width direction, and is the fifth factor. In FIG. 6, two rows of outward protrusions 6 are helically protruded, and in FIG. 6, one X-shaped outward protrusion 6 is protruded.

The bushing shown in FIG.
It is made by bulging out a number of protrusions to form a protruding pattern and joining them back to back.

In FIG. 8, the waveform shape of the bushing 5 shown in FIG.
B) is a series of narrow U-shaped combination waveforms of the inward protrusion 7, (C) is a series of chevron-shaped waveforms, and 2) is W
Each successive waveform is shown.

The bush 5 described so far has outward protrusions 6 or inward protrusions 7 extending mainly in the width direction of a plate-like body and are continuously arranged to form a protrusion pattern. The above-described effect of the bushing 5 can also be achieved by forming a protrusion pattern in which these outward protrusions 6 or inward protrusions 7 extend in the longitudinal direction of the plate-shaped body, that is, in the circular direction when mounted on the bearing device. and the effect is exactly the same.

Next, the thrust bearing shown in FIG. 9 and FIG. 1O will be explained.

In the bearing device shown in FIG. 9, the fixed part l and the movable part 3 are each integrally molded from a synthetic resin material, and the circular pedestal 11 and the support shaft 12 are integrally formed on the base frame lO. The movable part 3, which has a mounting frame 16 formed on the external upper part of a cylindrical frame 13, which has a support frame 15 having a shaft hole 14 protruding from the upper part of the inner periphery, is attached to the fixed part 1, which has a shaft hole 14.
M is fitted into the shaft hole 14, and the movable F!
The lower surface of the support frame 15 and one of the cylindrical frames 13 in AS3
Bushes 5 made of a metal material or an inorganic material such as ceramic are installed in the gaps formed between the side surfaces.

In this embodiment, a large number of outward protrusions 6 are formed on the upper surface and each surface of the cylindrical wall of the bushing 5, which has a cylindrical wall whose upper surface is donut-shaped and whose outer edge is bent into a lower blade, to support the support frame 15 in the movable part 3. A slit 8 that abuts the lower surface and the inner peripheral surface of the cylindrical frame 13 and provides elasticity is provided from the upper surface to the cylindrical wall, and has exactly the same function and effect as the bushing in the radial bearing described above. .

In the bearing device shown in Fig. 1O, the fixed part 1 and the movable part 3 have the same shape, and each of the fixed part 1 and the movable part 3 made of a metal material has a circular concave surface and is lined with synthetic resin. The bushing 5 shown in FIG. 7 is punched out into a disk shape and a slit 8 is formed to form a surface layer 2.4.The functions and effects are shown in FIG. 9. This is exactly the same as the thrust bearing shown in .

As described above, the present invention provides a bearing device in which at least the surface layer is formed of a synthetic resin material, and a bushing formed of a metal material or an inorganic material such as ceramic is provided on the surface layer surface of a fixed portion and a movable portion. Because it is attached freely, it has non-slip and noise-reducing properties.
In addition, each protrusion of the protrusion pattern of the bush and the slit work together to create an elastic contact effect, so it has excellent impact resistance, has an extremely simple structure, is convenient for lightweight design, and has extremely good durability. It has a wide range of uses as a bearing device.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a perspective view of a radial bearing, FIGS. and Fig. 8 is a side view, Fig. 4 is a plan view and a sectional view taken along line X-X, Figs. 5 and 6 are plan views, Fig. 7 is a plan view and a side view, and Fig. 9 is a thrust bearing. A side sectional view and a plan view of the bushing, and FIG. 1O are a side sectional view and a sectional view taken along the line Y--Y of another embodiment of the thrust bearing. l... Fixed part of the bearing device, 3... Movable part of the bearing device, 2.4... Synthetic resin lining surface layer part, 5...
...Butshu 6.7...Protrusion.

Claims (1)

[Claims] A bushing made of an inorganic material is movably brought into contact with the image surface layer of a movable part and a fixed part, at least the surface part of which is made of a synthetic resin material. A medium-low speed motor characterized by having a protrusion pattern arranged on at least one side, each of which has a bulging cross section, and a bushing with slits that is in elastic contact with the movable part and the fixed part. Non-lubricated bearing device.