KR101616015B1 - Bring including Sliding Layer has Not broken Fiber Matrix - Google Patents

Abstract

The present invention relates to a bush bearing and a sliding bearing having an outstanding effect in a harsh driving environment such as a high load condition, frequent change in a load condition, an insufficient lubrication condition, or the like in an area wherein a rotary machine, construction machinery, or the like. According to an embodiment of the present invention, a bush bearing and a sliding bearing having a composite material resin layer which is not broken comprise: a cylindrical body unit formed by a composite material; and a plurality of grooves formed in an inner side of the cylindrical body unit. A composite material resin layer forming the cylindrical body unit is continuously formed not to be cut along a circumference of the grooves.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bush bearing and a sliding bearing,

More particularly, the present invention relates to a bearing capable of exerting an excellent effect in a severe driving environment such as high load condition, fluctuation of frequent load condition, inadequate lubrication condition, etc. in the use area of rotating machine equipment and construction machine The present invention relates to a bush and a sliding bearing.

Generally, the bearings are moved including friction forces with the pins and the shafts. The bearings are driven by a mechanical element such as a solid lubricant is buried in a pin or a shaft support layer (hereinafter referred to as a slide layer) of the bearing or a lining layer or coating layer of a non-ferrous alloy, ceramic, It is used mainly as a supporting part or sliding part of a device in rotating industrial machine, guide post of a mold, each joint part of a construction machine, etc., and is divided into a bush type (cylindrical type, semi-cylindrical type) and a plate type .

Particularly, the joint part of high-load rotary machine and construction machine is driven under the surface pressure of 1.8Mpa ~ 120Mpa when driven, and has a driving condition with a large deviation from 0.2cm / sec to 10cm / sec at driving speed. In addition, it does not have uniform driving load and driving speed, and continuously changes according to the working environment.

In forming a metal or non-metal or polymer sliding layer on a metal support layer of such a bearing, a sliding layer made of a single material may be formed. However, depending on the shape and material of the supporting structure, dynamic and static pressures depending on sliding, As shown in FIG.

In some cases, a single material may be formed in a plurality of layers.

In order to ensure durability and reduce noise under complex and severe driving conditions, lubrication oil and grease are used to improve the lubrication characteristics, and to collect external impurities, improve durability life, increase the maintenance cycle, and extend lubricant and grease replenishment period. For this reason, various types of pores, grooves or dimples have been used in the slide layer.

However, when the sliding layer of the bearing does not have sufficient supporting ability for the static load, dynamic load, boundary lubrication condition, etc., the load supporting area is reduced by the groove or the dimple to increase the wear amount, Or dimples, it is impossible to collect impurities and the like, so that the foreign matter is mixed with the grease or the lubricant between the sliding layer and the pin or the shaft, and thereby the durability is reduced or the noise is increased, Shorten the Greek supplement period or shorten the replacement period.

In the case of a sliding layer made of a polymer, reinforcing particles or low friction particles are incorporated, or fiber bases are included. However, in order to satisfy the high precision required by the bearing, the post-processing is carried out, The physical properties are significantly reduced.

Korean Patent Laid-Open No. 10-2008-0012242 (Sliding Layer for Bearing Member)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a sliding bearing structure capable of securing a load supporting capacity of a sliding layer, an accommodation capacity, Bearing.

That is, it is an object of the present invention to provide a bearing capable of preventing physical properties from being deteriorated even if grooves are formed in a bearing sliding layer formed of a composite material.

And to provide a bearing capable of minimizing the friction coefficient by reducing the contact area of the sliding layer and thereby improving the lubrication function.

And to provide a bearing capable of improving lubrication performance.

The bush bearing and the sliding bearing including the non-breakable composite fiber layer according to the embodiments of the present invention include a cylindrical body portion formed of a composite material and a plurality of grooves formed inside the cylindrical body portion, The composite material fiber layer forming the body portion is continuously formed without being cut along the plurality of grooves.

The plurality of grooves may be a collecting groove formed in the inner peripheral surface of the cylindrical body portion and the oil supply groove formed to extend along the inner circumferential surface of the cylindrical body portion.

Wherein the oil supply groove is formed in a zigzag shape along the inner circumferential surface of the cylindrical body portion, one end of the oil supply groove has a width larger than the oil supply groove width, the oil supply portion is open to the outside, and the other end is closed.

And the collecting groove has a shape in which the area is narrowed along the rotating direction of the rotating body rotating on the inner peripheral surface of the body portion.

And the plurality of grooves are formed to be tapered along the depth direction.

And the total area of the plurality of grooves occupies 20% or more of the total area of the inner peripheral surface of the cylindrical body portion.

And the cylindrical body portion is formed by continuously winding composite fibers on a mandrel having a plurality of groove shapes.

In addition, the cylindrical body portion inner groove and the portion where the groove is not formed have the same physical strength.

And a coating layer formed on the inner circumferential surface of the cylindrical body portion.

And features construction and industrial machinery including one of the above bushings.

Next, the present invention relates to a cylindrical metal supporting layer; A body portion formed of a composite material and provided inside the metal supporting layer; And a plurality of grooves formed on the inner side of the body portion, and the composite material fiber layer forming the body portion is continuously formed without being cut along the plurality of grooves.

The bush bearings and the sliding bearings including the non-breakable composite fiber layer according to the present invention are designed to secure the load bearing capacity of the sliding layer, the accommodation capacity of the sliding bearing, the expansion of the wear resistance, and the improvement of the static characteristics or dynamic characteristics under boundary lubrication conditions .

That is, since the composite material fiber layer is continuously formed without being broken, it is possible to prevent the physical properties from being deteriorated even if a groove portion is formed in the bearing sliding layer.

In addition, since the composite fiber layer is continuously formed without breaking, the physical properties of the sliding layer are maintained, so that the friction coefficient can be minimized by reducing the contact area of the sliding layer, thereby improving the lubrication function.

Further, the shape of the groove of the slide layer is formed in such a shape as to optimize the lubrication performance, so that the lubrication performance can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a configuration diagram of a bearing according to a preferred embodiment of the present invention; Fig.
2 is a cross-sectional view of a bearing according to a preferred embodiment of the present invention;
3 is a configuration diagram of a bearing according to another preferred embodiment of the present invention.
Figure 4 is a cross-sectional view of a conventional bearing according to a preferred embodiment of the present invention,
5 is a reference view showing various shapes of grooves formed in a bearing according to a preferred embodiment of the present invention;

Before describing the embodiments according to the present invention in detail, the present invention is not limited to the configurations shown in the following description or the accompanying drawings, but may be used or performed in various ways.

It is also to be understood that the phraseology or terminology employed herein is for the purpose of description and should not be regarded as limiting.

That is, as used herein, the terms "mounted", "installed", "connected", "connected", "supported", "coupled", etc., It is used in a wide range of expressions, including both direct and indirect mounting, mounting, connection, connection, support, and engagement. The expressions "connected," "connected," and "coupled" are not limited to physical or mechanical connections, connections, or couplings.

In the present specification, terms indicating directions such as upper, lower, downward, upward, rearward, bottom, front, rear, etc. are used to describe the drawings, but these terms are used for convenience only, Time). Terms that express this direction should not be construed as limiting or limiting the invention in any way whatsoever.

Also, the terms "first", "second", "third", etc. used in this specification are for explanation purposes only and should not be construed to imply relative importance.

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

FIG. 1 is a block diagram of a bush bearing (hereinafter referred to as a bearing) including a non-breakable composite fiber layer according to a preferred embodiment of the present invention. FIG. 2 is a sectional view of a bearing 100 according to a preferred embodiment of the present invention. And includes a substantially cylindrical body 110 and a plurality of grooves formed inside the cylindrical body 110.

The body 110 is a sliding layer of the bush bearing 100, and is open at both ends. The inside of the body 110 has a cylindrical shape with a hollow and is configured to allow a pin and a shaft (not shown) to slide on the inner circumferential surface.

The body 110 may be formed of various composite materials and may be formed of a single composite material or may be formed of a composite material of different types depending on the user's selection.

That is, in a form in which the composite fiber layer 200, which is one of the features of the present invention, is continuously formed without breaking, selection of materials can be easily changed or mixed by the user.

In addition, the resin system composite fiber layer 120 for firmly supporting the composite fiber layer can be freely selected and implemented in a form in which the fiber layer 120 is continuously formed without being broken.

The method of manufacturing the bearing 100 according to the preferred embodiment of the present invention will be described in more detail below.

Next, the groove formed inside the body 110 is divided into the oil supply groove 120 and the collecting groove 130.

The oil supply groove 120 is a groove for supplying oil to the inner circumferential surface of the body portion 110. The oil supply groove 120 of the bearing 100 according to the preferred embodiment of the present invention is formed in a zigzag shape along the inner circumferential surface of the cylindrical body portion 110, One end of the oil supply groove 120 has a width W2 that is wider than the width W1 of the oil supply groove 120. The oil supply portion 122 is opened to the outside and the other end 126 is formed in a closed shape.

1, the oil supply groove 120 is formed in a zigzag shape along the longitudinal direction X of the body portion 110, and at the end portion of the body portion 110, (W2) that is wider than the width (W1) of the body portion (120) and is open to the outside. On the inner side of the body portion (110), the end portion is a closed shape without opening to the outside.

In order to prevent the oil from leaking to the outside, it is formed in such a way as to facilitate the lubrication through the wide oil supply part 122 from the outside and to have a clogged shape at the inside of the body part 110. [

The width W1 of the oil supply groove 120 is preferably 3 to 12 mm.

A plurality of grooves for collecting grease or impurities are provided along the rotation direction S and the longitudinal direction X of the rotating body rotating on the inner circumferential surface of the body 110. [

The collecting groove 130 is formed in a shape such that its area decreases along the rotational direction S of the rotating body rotating on the inner peripheral surface of the body 110.

That is, as shown in FIG. 5, the collecting groove 130 is formed in a rhombus shape and an inverted triangular cross-sectional shape when viewed from above along the rotation direction S of the rotating body rotating on the inner peripheral surface.

This is due to the wedging phenomenon of the grease by the shape narrowing in the direction of rotation so as to smooth the inflow of the grease than the existing round collecting groove.

The width of the collecting groove 130 is preferably 1 to 15 mm.

Next, it is preferable that the depth direction Z of the oil supply groove 120 and the collecting groove 130 has a tapered shape in the depth direction Z rather than a single straight line shape as shown in FIG.

This is because it is possible to accelerate the introduction of the grease into the collecting groove 130 due to the tapering in the depth direction. The shape of the taper may be inverted trapezoidal, semicircular or inverted triangular as shown in FIG. It can be formed according to the embodiment.

The depths of the oil supply groove 120 and the collecting groove 130 are preferably 5 to 15 mm, respectively.

3, a bearing 100 according to another embodiment of the present invention, as shown in FIG. 3, comprises a bearing 100 according to a preferred embodiment of the present invention as described above, And further includes a central oil supply groove (140) and an oil supply hole (150).

The central oil supply groove 140 is a groove formed in the inner peripheral surface of the body 110 to extend along the rotational direction S of the rotating body rotating on the outer peripheral surface thereof. Oil is provided on the outer peripheral surface of the inner center of the body 110, .

An oil supply hole 150 is formed through the body 110 in the thickness direction to supply oil to the middle oil supply groove 140.

Accordingly, oil can be supplied to the central oil supply groove 140 through the oil supply hole 150 and the oil supply hole 150 can be connected to the oil supply groove 120 according to the user's choice. The oil supply groove 120 and the central oil supply groove 140 may be connected to each other.

The plurality of grooves provided in the bearing according to the preferred embodiment of the present invention and the other embodiment are configured as described above, and the total area of the plurality of grooves is configured to occupy 20% or more of the total area of the inner peripheral surface of the cylindrical body portion.

This is because the bearings according to the preferred embodiments of the present invention and other embodiments can maintain the load bearing capacity without deteriorating the physical properties because the composite material fiber layer is continuously formed without being cut at the grooves, To minimize the contact cross-sectional area between the rotating body and the bearing so as to minimize the friction coefficient with the whole.

This configuration is one of the features of the present invention which can not be realized in the conventional bush bearing.

Next, a bearing 100 according to a preferred embodiment of the present invention may form a coating layer (not shown) on the inner circumferential surface of the body 110.

The coating layer is configured to maximize the load bearing capacity and to increase the heat radiation efficiency of the frictional heat.

The coating layer is formed of a polymer resin. The polymer resin may be a polyurethane resin, a polyamide resin, a polyalphaolefin resin, a vinyl resin, an acrylic resin, a polyacetal resin, a polyether resin, a polyester resin, a polyether sulfone resin, At least one member selected from the group consisting of polyimide, polyimide, polypeptide, polyketone, polyolefin, polyimide, vinylidene, phenol and epoxy.

In order to maximize the load bearing capacity of the coating layer, nano-sized reinforcing particles are included in the polymer resin.

The reinforcing particles may include powders of Pb, Sn, Zn, Cu, Ag and In; Oxides, nitrides, sulfides and hydroxides of Si, Ge, Ca, Al, B, Zn, Cd, Ti, Zr, Y, Ce, Sn, In, La, Fe, Cu, Ta, Nb, V, Mo and W; Carbon black; Activated carbon; And nano-diamonds.

The bearing 100 according to the preferred embodiment of the present invention is thus configured to provide the bearing 100 capable of exhibiting excellent performance even in extreme environments and various environmental changes.

FIG. 4 is a view for comparing bearings according to a preferred embodiment of the present invention with conventional bearings. Referring to FIG. 4, a composite material fiber layer is formed on a bearing 100 ) Will now be described.

FIG. 4A is a reference diagram for explaining the characteristics of the composite material, and delamination (D in FIG. 4A) occurs in the middle of the composite material layer.

As shown in C of FIG. 4, the conventional bush bearing is formed by laminating a composite material fiber layer and then cutting the same to secure dimensions.

That is, in the case of a structure requiring only a tubular stiffness, the dimensional accuracy is not high, so that it can be wound continuously and used without post-processing after lamination.

However, in the case of bushing bearings, since the dimensional accuracy can not be secured by forming, generally, the composite material layer is formed and then the dimensions are secured through the machining to form the grooves through machining.

However, if the grooves are processed as described above, the composite material fiber layer is broken as shown in FIG. 4B, and the physical properties are significantly reduced.

The composite fiber layer thus cut off accelerates the lamination delamination of the composite material described above.

However, since the bearing 100 according to the preferred embodiment of the present invention is formed continuously without breaking along the circumference of the groove of the composite material fiber layer 200, it is possible to provide an excellent bearing 100 without deteriorating physical properties of the composite material .

Table 1 is a table comparing the physical properties of a conventional bearing including a broken fiber layer and a bearing 100 according to a preferred embodiment of the present invention. The bearing 100 according to the preferred embodiment of the present invention has a physical property It can be seen that it is overwhelmingly superior to the conventional method.

division Fibrous layer state Compressive strength
(MPa) Modulus of elasticity
(Gpa) Coefficient of friction
μ The tensile strength
MPa Shear strength
MPa Carbon + phenol Broken
(Existing technology) 250 12 0.35 150 15 Carbon + phenol Not broken
(Invention) 445 65 0.2 593 40 Carbon + epoxy Broken
(Existing technology) 256 13 0.32 155 17 Carbon + epoxy Not broken
(Invention) 520 62 0.15 709 63

The bearing 100 according to the preferred embodiment of the present invention is fabricated in a manner different from the conventional method in order to form the composite material fiber layer without breaking.

That is, the releasing agent is applied to a mandrel having a shape corresponding to the inner circumferential surface shape of the body portion 110 of the bearing 100, which is not a conventional simple composite fiber layer lamination molding method, So that the shape of the body 110 is formed.

Then, the body portion 110 is formed through external pressurization, and then the separable men drill is separated and removed from the body portion 110, thereby manufacturing the bearing 100.

The bearing 100 according to the preferred embodiment of the present invention can produce excellent bearings by such a simple process.

A bearing 100 according to a preferred embodiment of the present invention is a bushing bearing of the present invention and can be used as a sliding bearing by forming a metal supporting layer as a base layer 300 on the outside of a bushing bearing. The present invention is also applicable to a construction machine equipped with the above construction.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be suitably modified and applied in the same manner. Therefore, the above description does not limit the scope of the present invention, which is defined by the limitations of the following claims.

100: bearing 110: body part 120: oil supply groove 130: collecting groove
140: central oil supply groove 150: collecting hole 300: base layer

Claims (11)

A cylindrical body portion formed of a composite material; and
And a plurality of grooves formed in the inside of the cylindrical body portion
The composite material fiber layer forming the cylindrical body portion is continuously formed along the plurality of grooves without being cut,
Wherein the plurality of grooves are a collecting groove formed on an inner peripheral surface of a cylindrical body portion and an oil supply groove formed to extend along a cylindrical inner circumferential surface of the body portion,
The total area of the plurality of grooves occupying 20% or more of the total area of the inner peripheral surface of the cylindrical body portion,
Wherein the collecting groove is a collecting groove for collecting grease or impurities, the surface shape of which is triangular or rhombic, the area of which is reduced along the rotational direction of the rotating body rotating on the cylindrical inner circumferential surface of the cylindrical body, Tapered,
The cylindrical body portion can be divided so that the groove and the portion where the groove is not formed have the same physical strength and the mold release agent is applied to the mandrel having the shape corresponding to the inner peripheral surface shape of the cylindrical body portion, Wherein the cylindrical body portion is formed through external pressurization after the cylindrical body portion is formed by winding the cylindrical body portion continuously, and then the separable men drill is separated and removed from the cylindrical body portion. delete The method according to claim 1,
Wherein the oil supply groove is formed in a zigzag shape along the inner circumferential surface of the cylindrical body portion and has one end wider than the oil supply groove width and formed with an oil supply portion that is open to the outside and a closed end at the other end. delete delete delete delete delete The method according to claim 1,
And a coating layer is formed on the inner circumferential surface of the cylindrical body portion. A construction machine comprising a bush and a sliding bearing according to any one of claims 1, 3 and 9. delete

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