JPH04227891A - Eccentric structure - Google Patents

Abstract

PURPOSE: To increase transfer efficiency of an oil body by providing at least one cavity in a disk in which a pad or plug with specific gravity different from the disk is incorporated in an eccentric structure of an oscillating machine or the like. CONSTITUTION: A disk rotatable around the axis 12 comprises a metal or an oil-resisting plastic material, and has holes 15 to 17 below and holes 21 to 23 above with respect to a symmetric axis X-X on the circumference 14. Cylindrical pads 18 to 20 made of materials having a higher specific gravity than that of the material of the disk 11, preferably lead, tungsten or the like are incorporated in the lower holes 15 to 17. On the other hand, cylindrical plugs 24 to 26 made of materials having a lower specific gravity than that of the material of the disk 11 such as nylon and polyethyleneterephthalate are incorporated in the upper holes 21 to 23 and are fixed individually by fastening a screw 27. Thus, only liquid transfer effect is obtained without giving an impact to a liquid transferred toward the walls of a container.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eccentric structure used in a vibrator such as a compactor, a picker, a vibrating plate, and generally a vibrator for conveying small particles.

The entire structure of this type of device includes a support member in which bearings are arranged, which bearings require continuous lubrication.

0003

BACKGROUND OF THE INVENTION There are two types of lubrication. One type is the so-called "flutter lubrication", the other type is the so-called "spray lubrication".

Generally, "spray" lubrication involves injecting an oil spray against the bearing, collecting excess oil in a collection vessel, and pumping the oil back from the vessel to the spray nozzle. This type of lubrication is carried out only at atmospheric pressure.

"Fluttering" lubrication can be carried out at atmospheric or reduced pressure, and is generally driven by an eccentric in rotation in an oil container so that the oil is flung toward the container's periphery by centrifugal force and into the container walls. Small channels are arranged and the oil is conveyed through these channels to the bearings,
It is then collected at the bottom of the oil container.

[0006]

Several types of eccentrics are known.

The first type of eccentric body consists of a metal semicircular disc (for example, an iron disc), which is driven in rotation about its axis, and every half revolution an impact is applied to the oil body, causing the oil to flow into the container. crashed into the wall of This impact effect depends on the disc diameter, disc thickness and oil viscosity, but is generally quite strong. The use of this type of eccentric is therefore limited to small outputs.

[0008] In order to expand the range of applications of the eccentric body,
A method has been proposed in which a semicircular disk is housed in a thin metal semicircular housing (e.g. a metal plate housing).

Although this construction avoids the oil impact described above and produces an oil-driven effect, the welded or riveted seams in the casing constitute a weak point in the assembly, allowing the casing to rupture and release from the internal semicircular disk. There are serious drawbacks to separation.

Another type of eccentric consists of a circular disc,
By cutting this disk, a semicircular eccentric body is formed and rotated as described above, but as a unit.

[0011] In this structure, the strong impact in the first case is reduced, and the container separation as in the second case cannot occur, but the force generated during rotation of the eccentric body is limited. .

The presence of a fluttering effect forces the rotational speed of the eccentric to be reduced, thus reducing the driving effect compared to the second case described above.

[0013]

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned drawbacks of impact action and detachment of eccentric bodies, and to provide a solution to the container wall (without consuming too much energy). The purpose is to increase the efficiency of oil body transfer.

It is therefore an object of the present invention to provide an eccentric structure comprising a metal disk (generally a steel disk) rotating about a central axis, said disk being made of a material having a specific specific gravity and having a radial direction relative to said axis. at least one cavity in the outer region, said cavity being made of at least one material of a specific gravity different from that of the material of said disc.
An eccentric structure is provided which accommodates two pads.

According to a first preferred embodiment of the invention, the disc comprises at least two cavities each arranged in opposite regions of an axis of symmetry perpendicular to the axis of rotation, one of the opposing cavities contains a pad or plug of material of higher or lower specific gravity than the disk material.

[0016] According to another embodiment of the invention, the disc comprises at least two cavities each arranged in an area on either side of an axis of symmetry perpendicular to the axis of rotation, and in an area on one side of the axis of symmetry. at least one of the cavities arranged in the disc material accommodates a pad or plug of a material of higher specific gravity than the disc material, and at least one of the cavities arranged in the opposite region with respect to the axis of symmetry contains a pad or plug of a material of lower specific gravity than the disc material. Contains a pad or plug of material.

According to yet another preferred embodiment of the invention, the disc comprises a plurality of cavities arranged along a circular axis of concentric axes, on one side of the axis of symmetry of the disc perpendicular to the axis of rotation. at least one of the cavities located on the other side of the axis of symmetry of the disc receives a pad or plug of a material of higher specific gravity than the disc material, and at least one of the cavities located on the other side of the axis of symmetry of the disc is lower than the disc material. Contains a pad or plug made of a material of specific gravity.

More preferably, the cavity is circular or has a circular hole. More preferably,
The pad has the same shape as the cavity and is permanently press-fit within the cavity.

Preferably, the material of said heavy pad or plug is selected from the group consisting of lead, tungsten and special alloys.

More preferably, said light pad or plug is a plastic material, preferably selected from nylon, polyethylene terephthalate and mixtures thereof.

The present invention will be described below with reference to embodiments shown in the drawings, but the present invention is not limited to these embodiments.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to FIGS. 1 and 2.

10 generally shows an eccentric structure according to the present invention. This eccentric body consists of a disk 11 of constant thickness of a metallic material such as steel, iron, cast iron, or of a plastics material resistant to oil. The disk 11 is essentially circular and rotatable about its axis 12, and is substantially dynamically balanced by its very contour in the absence of special foreign material within the body spaced from its axis. It is formed so that

The disk 11 has six holes 13, and the axes of these holes are each on a circumference 14.
4 coincides with the axis of the disk, and the diameter of the circumference 14 and the diameter of each hole 13 are as shown in FIG.
It is chosen such that there is a suitable space S between the outermost edge of each hole 13 and the circumference delimiting the disk.

At the center of the disk is located a device (not shown) for splining the disk to the axis of rotation, but this device is well known in the industry and will not be described further.

If the axis XX is taken as the axis of symmetry of the disk 11, as shown in FIG. material, preferably lead,
Cylindrical pads 18, 19 and 2 made of tungsten or an alloy containing at least one of these metals
Contains 0.

Three holes 21, 22 above the axis of symmetry
and 23 are materials with a specific gravity lower than that of the material of the disc 11, preferably nylon (specific gravity 1.2), polyethylene
It houses cylindrical plugs 24, 25, 26 made of terephthalate or a compound of these plastic materials.

The pads and plugs are sized to be force-fitted and permanently securely retained within their respective holes. For further safety, screws 27 acting radially on the pads and plugs can be added.

According to another embodiment of the invention, the holes 13 can be present on each side of the axis of symmetry XX along two lines parallel to this axis.

Also, the number of holes 13 is not six as shown in the figure, but only one hole located on one side of the axis of symmetry XX and spaced apart from this axis, and said hole accommodates a lead pad. It can be made to an appropriate size. In this case, an eccentric structure suitable for a particular application is obtained.

The performance of the eccentric is enhanced by providing holes containing nylon plugs at the same distance on opposite sides of the axis of symmetry XX.

[0032] Also, the hole can have a shape other than the above-mentioned cylindrical shape. For example, these holes can be blind holes, triangular, square, polygonal or slice-shaped or of other shapes. Of course, the pads and plugs have shapes similar to those of these holes.

[0033] The pad and plug are not press-fitted,
Bonding can be achieved if it is compatible with the adhesive used, but this type of fastening method is less economical than push-fitting.

Alternatively, the holes and the corresponding pads and plugs can be secured by screwing, but this may lead to undesirable slight movements between the assembled elements, especially when applied to heavy use. There is sex.

[0035] The shape of the pad and plug must match the shape of the hole and cavity in the disk;
This does not mean that each shape has to be the same. For example, the shape of the hole and cavity may be cylindrical, and the shape of the corresponding pad and plug may be partially cylindrical with flat sides, as indicated by the dotted line 28 in FIG. can.

[0036]

The eccentrics and other structures according to the invention described in connection with the preferred embodiments above fully accomplish their intended purpose, namely an improvement in the performance of similar structures of the prior art.

As a practical matter, the above-mentioned eccentric structure, which is essentially circular (sometimes slightly elliptical), exhibits no impacting effect on the liquid being moved towards the walls of the container, and has a liquid transport effect. only can be obtained. This means that the structure is also suitable for high-power vibrators, thus extending its application.

More specifically, the structure of the present invention is able to withstand high disk rotational speeds well and provides a relatively larger eccentric than the prior art, resulting in increased liquid transfer efficiency. . Alternatively, the structure can be made smaller while maintaining the same efficiency.

Furthermore, problems of component separation (as in the case of eccentrics housed in a case) no longer exist. As a practical matter, the structure according to the invention consists of masses that are completely fixedly attached to one another and thus forms an essentially compact structure. Therefore, the structure of the present invention can be effectively used even in vibrators operating under the most severe conditions, both in terms of frequency and vibration.

Furthermore, the eccentric structure of the present invention is simple,
Its manufacture is simple and easy, and therefore the advantage of reducing manufacturing costs cannot be ignored.

Although the preferred embodiment and a few other embodiments of the eccentric structure of the present invention have been described, the present invention is not limited only to the above description, but can be modified within the scope of the invention. Changes can be made arbitrarily.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an eccentric structure according to the invention.

FIG. 2 is a plan view of the eccentric structure of FIG. 1;

[Explanation of symbols]

10 Eccentric structure 11 Disc 12 Axis line 13 holes 14 Circumference 15 holes 16 holes 17 Hole 18 Pad 19 Pad 20 Pad 21 hole 22 hole 23 holes 24 Plug 25 Plug 26 Plug 27 Screw 28 Modifications of pads or plugs

Claims (10)

[Claims] 1. An eccentric structure comprising a disk rotating about a central axis, said disk being made of a material having a specific gravity and having at least one cavity in a radially outer region with respect to said axis, An eccentric structure characterized in that the cavity accommodates at least one pad made of a material of a different specific gravity than the material of the disk. 2. The disk comprises at least two cavities respectively arranged in opposite regions of an axis of symmetry perpendicular to the axis of rotation, one of the opposing cavities having a specific gravity of higher or lower specific gravity than the disk material. 2. Eccentric structure according to claim 1, characterized in that it accommodates a pad or plug of material. 3. The disk comprises at least two cavities each located in an area on either side of an axis of symmetry perpendicular to the axis of rotation, at least one of the cavities being located in an area on one side of the axis of symmetry. accommodating a pad or plug of a material of higher specific gravity than said disc material, and at least one of the cavities arranged in opposite areas with respect to said axis of symmetry accommodating a pad or plug of a material of lower specific gravity than said disc material; The eccentric structure according to claim 1, characterized in that: 4. The disk comprises a plurality of cavities arranged along a circle of concentric axes, at least one of the cavities arranged on one side of an axis of symmetry of the disk perpendicular to the axis of rotation of the disk. accommodating a pad or plug of a material of higher specific gravity than the disc material, and at least one of the cavities located on the other side of the axis of symmetry of said disc receiving a pad or plug of a material of lower specific gravity than said disc material; The eccentric structure according to claim 1, characterized in that: 5. The eccentric structure according to claim 1, wherein the cavity is circular. 6. The eccentric structure according to claim 1, wherein the cavity is a circular through hole. 7. The eccentric structure according to claim 1, wherein the pad has a similar shape to the cavity. 8. The eccentric structure of claim 1, wherein the pad is permanently press-fit within the cavity. 9. The eccentric structure of claim 1, wherein the material of the pad is selected from the group consisting of lead, tungsten and special alloys. 10. Eccentric structure according to claim 2, characterized in that the plug is a plastic material, preferably selected from nylon, polyethylene terephthalate and mixtures thereof.