KR20060003578A - Composite journal bearing in which concave surface is formed and fabrication method thereof - Google Patents

Abstract

The present invention relates to a composite journal bearing having a concave-convex inner surface, and discloses a composite journal bearing having a concave-convex composite plate formed therein. The composite journal bearing having an inner concave-convex surface according to the present invention is composed of a hollow cylinder type housing and a composite sheet having a concave-convex surface formed on the inner surface of the housing. The manufacturing method includes a step of manufacturing an uneven mold, a step of pressing the composite sheet on the uneven mold, and attaching the composite sheet to the hollow cylinder housing. Accordingly, the present invention has a space for accommodating wear particles at the interface between the journal bearing and the spindle, thereby preventing damage to the spindle due to friction between the abrasive wear particles and the spindle, and replacement of the lubricating fluid in the bearing. Due to this, the grinding particles are easily leaked out to prevent friction, and the heat formed in the bearing can be easily leaked to the outside. In addition, the present invention can increase the contact area between the lubricating oil and the bearing to easily discharge the heat generated in the oil film to the outside to prevent the oil film from thinning, and to generate a relatively high pressure by the lubricating oil in the bearing at low speed The wear between the journal bearing and the spindle can be reduced.

Hybrid, Bearing, Composite, Uneven, Mold, Mandrel, Hardened

Description

Composite journal bearing with irregular inner surface and its manufacturing method {COMPOSITE JOURNAL BEARING IN WHICH CONCAVE SURFACE IS FORMED AND FABRICATION METHOD THEREOF}

1 is a cross-sectional view showing a conventional journal bearing system.

Figure 2a is an exploded perspective view of the uneven mold according to the first embodiment of the present invention.

2B is a view showing a process of pressing a composite sheet according to the first embodiment of the present invention.

3 is a perspective view showing a composite sheet produced according to the first embodiment of the present invention.

4 is a perspective view of an uneven mold according to a second embodiment of the present invention.

5 is a perspective view showing a composite sheet produced in accordance with a second embodiment of the present invention.

6 is a perspective view of an uneven mold according to a third embodiment of the present invention.

7 is a view showing a process of pressing a composite sheet according to a third embodiment of the present invention.

FIG. 8 is an enlarged view of “A” of FIG. 7.

9 is a perspective view showing a composite plate produced in accordance with a third embodiment of the present invention.

FIG. 10 is an enlarged view of “B” of FIG. 9.

11 is a perspective view of an uneven mold according to a fourth embodiment of the present invention.

12 is a perspective view of a composite plate prepared in accordance with a fourth embodiment of the present invention.

13 is a perspective view of a composite journal bearing made in accordance with embodiments of the present invention.

14 is a flowchart of a method for manufacturing a composite journal bearing according to the present invention.

♣ Explanation of symbols for main parts of drawing ♣

1 housing 3 journal bearing

5: spindle 7: lubricant

10: uneven mold 12: mandrel

13: first round metal sheet 14: second round metal sheet

18: uneven mold surface 20: uneven mold

22: mandrel 24: fine metal wire

28: mold uneven surface

30: uneven mold 32: thin plate fixing bar

33: 1st strip metal plate 34: 2nd strip metal plate

38: uneven mold surface 40: uneven mold

42: mandrel 44: fiber thin wire

48: uneven mold surface

50: composite plate 52, 54, 56: uneven surface

60 housing

The present invention relates to a composite journal bearing having an inner concave-convex surface, and to a composite journal bearing having a concave-convex composite plate attached to the housing so that sufficient pressure is generated in the bearing at low speed and facilitates heat transfer to the outside at high speed. It is about.

1 is a cross-sectional view showing a conventional journal bearing system. As shown in FIG. 1, the conventional fluid journal bearing system is equipped with a journal bearing 3 inside the housing 1. The main shaft 5 is inserted inside the housing 1 in which the journal bearing 3 is mounted. Lubricant 7 is injected between the main shaft 5 and the housing 1 to smooth the flow of the main shaft 5. As shown in FIG. 1, the distance between the journal bearing 3 and the main shaft 5 is narrow compared to the distance between the inner diameter of the other housing 1 and the main shaft 5.

Accordingly, the pressure of the lubricating oil present between the main shaft 5 and the journal bearing 3 at the time of rotation of the main shaft 5 becomes relatively higher than the pressure of the lubricating oil present between the main shaft 5 and the housing 1. Due to the increased pressure, the main shaft 5 is rotated while being supported by the oil film by the pressure of the lubricating oil 7 without directly contacting the journal bearing 3.

In the general case, since the fluid journal bearing system does not generate sufficient pressure in the lubricant between the journal bearing and the spindle at low speeds, the oil film becomes thin and the journal bearing and the spindle are in direct contact. As such, when the journal bearing and the main shaft are in direct contact, the main shaft and the journal bearing may wear and shorten the life of the fluid journal bearing system.

In the fluid journal bearing system, the lubricant temperature is increased by high rotational energy at high speed, and thus the viscosity of the lubricant is lowered. If the viscosity of the lubricating oil becomes low, the oil film may become thin and the journal bearing and the spindle may directly contact, causing the spindle and the journal bearing to wear out.

The material of the journal bearing should have a relatively low hardness and a low coefficient of friction than the material of the spindle to prevent wear of the rotating spindle. In addition, the material of the journal bearing should have a high thermal conductivity coefficient in order to quickly release heat to the outside to prevent the temperature rise of the lubricant.

In order to satisfy the above-mentioned conditions, a material widely used as a material for journal bearings is white metal. White metal is an alloy consisting of antimony and copper in tin or lead. White metal not only has a relatively low hardness and a low coefficient of friction, but also a high thermal conductivity. However, since the fixing temperature is fixed at too low a temperature of about 135 ° C, the journal bearing and the main shaft made of white metal can be stuck.

Although thick composite materials have been used as journal bearing materials to prevent sticking between journal bearings and main shafts, thick composite materials have low thermal conductivity and high coefficient of friction. Accordingly, the journal bearing made of a thick composite material has a problem that the viscosity of the lubricating oil is lowered due to heat generated therein, resulting in the bearing and the main shaft being directly contacted and worn.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a composite journal bearing having a concave-convex inner surface to minimize the friction between the main shaft and the bearing and a manufacturing method thereof.

Another object of the present invention is to provide a composite journal bearing having a concave-convex inner surface which prevents the viscosity of the lubricating oil from lowering by increasing the thermal conductivity, thereby preventing the temperature rise of the lubricating oil existing between the main shaft and the bearing, and a method of manufacturing the same.

Still another object of the present invention is to provide a composite journal bearing having a concave-convex inner surface which can easily circulate lubricating oil so as to easily discharge the wear material generated when the main shaft and the bearing contact.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

As a feature of the present invention for achieving the above object, the composite journal bearing formed with the uneven inner surface according to the present invention is composed of a hollow cylinder-type housing, and a composite material plate attached to the inner surface of the housing and formed with the uneven surface.

As another feature of the present invention, a method of manufacturing a composite journal bearing having an inner surface of an uneven surface according to the present invention includes the steps of manufacturing an uneven mold, pressing a composite sheet into an uneven mold, and a hollow cylinder type composite sheet. Attaching to the housing.

Hereinafter will be described in detail with reference to the accompanying drawings with respect to the composite journal bearing formed with the inner surface irregularities according to the present invention.

Figure 2a is an exploded perspective view of the uneven mold according to the first embodiment of the present invention, Figure 2b is a view showing a process for pressing the composite plate according to the first embodiment of the present invention. As shown in FIG. 2A, the uneven mold 10 has a shape in which a plurality of first circular metal thin plates 13 and second circular metal thin plates 14 are alternately disposed on a cylindrical mandrel 12. The first circular metal thin plate 13 and the second circular metal thin plate 14 each have a different diameter. Holes corresponding to each other are formed in the first circular metal thin plate 13 and the second circular metal thin plate 14.

The thin plate fixing disk 16 fixes the plurality of first circular metal thin plates 13 and the second circular metal thin plates 14 with the mandrel 12. The thin plate fixing disc 16 is formed with holes corresponding to the holes formed in the first circular metal thin plate 13 and the second circular metal thin plate 14. Accordingly, the screw 17 is inserted into each hole corresponding to each other so that the first circular metal thin plate 13 and the second circular metal thin plate 14 are alternately arranged in close contact.

2A to 3, the uneven mold 10 has a mold uneven surface 18 formed between the mandrel 12 and the thin plate fixing disk 16. The mold uneven surface 18 is an outer circumferential surface of the first circular metal thin plate 13 and the second circular metal thin plate 14 having different diameters. The width of the mold recessed surface 18 is determined according to the number of the first circular metal thin plate 13 and the second circular metal thin plate 14. The composite sheet 50 according to the present invention is pressed on the mold uneven surface 18 to form the uneven surface 52 having grooves in the circumferential direction.

4 is a perspective view of an uneven mold according to a second embodiment of the present invention. As shown in FIG. 4, the uneven mold 20 is manufactured in a form in which the fine metal wire 24 is wound around the mandrel 22. As a result, the uneven mold 20 is formed with a mold uneven surface 28 composed of fine metal wires 24. The composite plate 50 is pressed onto the mold uneven surface 28 formed to a predetermined thickness, so that the uneven surface 52 (see FIG. 5) provided with grooves in the circumferential direction is formed.

5 is a perspective view showing a composite sheet produced in accordance with a second embodiment of the present invention. 4 and 5 together, the composite plate 50 is pressed on the mold irregularities surface 28, the uneven surface corresponding to the shape of the mold irregularities surface 28 on the surface of the composite plate 50 ( 54) is formed. Before the composite sheet 50 is pressed into the uneven mold 20, the mold uneven surface 28 is released from a release material or a release film. Accordingly, the composite sheet 50 is easily separated from the uneven mold 20 after being pressed.

The composite sheet 50 is prepared in a thin thin plate form and is composed of a carbon reinforced composite material or the like. The composite plate 50 may be prepared to a size that can be attached to correspond to the overall size of the bearing housing to be produced in one plate. In addition, as shown in Figures 3 and 5, the composite plate 50 may be fabricated to sequentially adhere the plurality of composite plate 50 to the bearing housing by making several cells of a small size.

The composite plate 50 produced by the first and second embodiments of the uneven mold for manufacturing the journal bearing according to the present invention is provided on the inner surface of the housing 60 (see FIG. 13) to be attached. It is made to correspond. In this case, the unevenness formed in the uneven surface 52 of the composite sheet 50 is formed in the circumferential direction of the housing 60. In other words, the unevenness formed on the uneven surface 52 of the composite sheet 50 is formed to match the direction of rotation of the bearing. Accordingly, the coefficient of friction between the main shaft and the uneven surface formed on the uneven surface 52 during the rotation of the main shaft is lowered, so that the main shaft is less wearable than the bearing without the uneven surface.

6 is a perspective view of an uneven mold according to a third embodiment of the present invention, Figure 7 is a view showing a process for pressing the composite plate according to a third embodiment of the present invention, Figure 8 is a "A of FIG. Is an enlarged view of ". 6 to 8, the uneven mold 30 according to the third embodiment of the present invention is manufactured in a plate shape.

The uneven mold 30 is composed of a first strip metal plate 33 and the second strip metal plate 34 alternately disposed between the thin plate fixing bar 32. The first strip metal thin plate 33 and the second strip metal thin plate 34 are provided in a strip shape in which the horizontal length is relatively longer than the vertical length. The first concave portion 35 formed on the first strip metal sheet 33 and the second concave portion 36 formed on the second strip metal sheet 34 are alternately arranged. Accordingly, the uneven mold 30 is formed with a mold uneven surface 38 composed of the first concave portion 35 and the second concave portion 36. A corresponding hole is formed in the thin plate fixing bar 32, the first strip metal thin plate 33, and the second strip metal thin plate 34, and is disposed between the two thin plate fixing bars 32 by a screw 37. The first strip metal thin plate 33 and the second strip metal thin plate 34 are disposed.

FIG. 9 is a perspective view showing a composite plate manufactured according to a third embodiment of the present invention, and FIG. 10 is an enlarged view of "B" in FIG. 9 and 10, a plurality of grooves 57 are formed in the longitudinal direction on the concave-convex surface 56 of the composite sheet 50 produced according to the third embodiment of the present invention. The plurality of grooves 57 are provided in an array form, and the arrays are staggered in the longitudinal direction. In this case, since the arrangement of the plurality of grooves 57 is the same as the lateral flow direction of the lubricating oil in the bearing, it is easy to discharge the grinding particles generated therein due to the frictional force between the main shaft and the journal bearing. In addition, since the plurality of grooves 57 are easily formed to circulate the lubricating oil, the lubricating oil can be easily released. Furthermore, since the flow direction of the main shaft and the direction of the grooves 57 formed in the uneven surface 56 are perpendicular, the relative direction of the grooves 57 of the uneven surface 56 is not formed even though the main shaft rotates at a low speed. The pressure is greatly generated. Therefore, the spindle and the journal bearing do not rub even at low speeds.

11 is a perspective view of an uneven mold according to a fourth embodiment of the present invention. The uneven mold 40 according to the fourth embodiment of the present invention is manufactured in a form in which the fibrous fine wire 44 is wound around the mandrel 42. Accordingly, the uneven mold 40 is formed with a mold uneven surface 48 composed of fine fiber 44.

The fine fiber wire 44 is wound around the mandrel 42 at regular intervals on the release film is coated or the release material is applied. The fibrous wire 44 is made of PTFE (Poly Tetra Fluoro Ethylene) fibers or PE (Poly Ethylene) fibers. PTFE fiber or PE fiber lowers the coefficient of friction of the composite plate 50 produced because the coefficient of friction is relatively low compared to other materials. In the process of co-curing the composite sheet 50 and the fibrous fine wire 44, the fibrous fine wire 44 wound around the release-treated mandrel 42 is co-cured in the composite plate 50.

12 is a perspective view of a composite plate prepared in accordance with a fourth embodiment of the present invention. As shown in FIG. 8, the composite sheet 50 manufactured according to the fourth embodiment of the present invention forms the uneven surface 58 by the coarse fiber 44 in the interior thereof. Since the composite plate 50 has irregularities formed on the inner surface of the fiber material, the friction coefficient is reduced. Accordingly, not only the generation of the grinding particles in the bearing can be reduced, but also the heat generated inside the bearing can be further reduced as compared with the case where there is no irregularities.

A material having a relatively low friction coefficient is coated or coated on the mold uneven surface 18; 28; 38 of the uneven mold 10; 20; 30 according to the first, second and third embodiments of the present invention. Can be. Such materials include PTFE fibers, PE fibers, polymer powders, graphite powders, MbS ₂ powders, polymer films, and the like. Accordingly, such a fiber material and the like may be co-cured on the uneven surfaces 52 and 54 and 56 of the composite sheet 50 produced by the first to third embodiments. The method of co-curing is the same as that of the fourth embodiment of the present invention.

13 is a perspective view of a composite journal bearing made in accordance with embodiments of the present invention. As shown in FIG. 13, the composite journal bearing manufactured according to the present invention includes a hollow cylinder-type housing 60 and a composite plate 50 attached to an inner surface of the housing 60. The composite plate 50 is formed with the uneven surface 52; 54; 56; 58 produced by the first to fourth embodiments of the present invention. Composite plate 50 may be fitted to housing 60 or attached to housing 60 by an adhesive. In addition, the composite sheet 50 may be attached to the housing 60 by co-curing the composite material prepreg or copper plate attached to the bonding surface with the housing 60. In FIG. 13, the composite plate 50 is attached to the entire inner surface of the housing 60, but according to the present invention, the composite plate of the cell form may be attached only to a part of the housing 60. In particular, the composite plate 50 may be attached only to the lower portion of the inner surface to which the load of the bearing is relatively large compared to other portions.

14 is a flowchart of a method for manufacturing a composite journal bearing according to the present invention. As shown in Figure 14, according to the method of the present invention, first uneven mold is produced (S10). Uneven mold is produced by a variety of ways to form the unevenness in the pressing mold. According to the journal bearing manufacturing method of the present invention, the uneven mold 10 is manufactured by alternately arranging circular metal thin plates 13 and 14 having different diameters and fixing them. And the uneven mold 20 is produced by placing the metal fine wire 24 at a predetermined interval. In addition, the uneven mold 30 is produced by alternately arranging the band-shaped metal thin plates 33 and 34 formed by staggering the uneven portions. Further, the uneven mold 40 is manufactured by simultaneously curing the fine fiber 44, which is released on the mandrel 42, to form the unevenness of the fine fiber 44 itself. The unevenness formed on the uneven mold (10; 20; 40) is formed in the same direction as the rotational direction of the main shaft, or the unevenness formed on the uneven mold 30 is formed in a direction perpendicular to the rotational direction of the main shaft.

Next, the uneven mold surface is released (S12). In general, the release treatment refers to a treatment such that the adhesive force is lowered when the surface to be bonded is heated at room temperature. For the release treatment, a release film is coated or a release agent is applied to a portion where the unevenness of the uneven molds 10; 20; 30; 40 is formed.

After the mold release surface of the uneven mold surface, the fiber material is applied on the uneven mold surface subjected to the release treatment (S14). Here, the fiber material is PTFE fiber, polymer powder, graphite powder, MbS2 powder, PE fiber, polymer film and the like. Such a fiber material is coated with a film-like material or fixed to a powdery material on the uneven mold surface.

Thereafter, the composite sheet 50 is pressed onto the uneven mold 10; 20; 30; 40 (S16). The uneven surface 52; 54; 56; 58 is formed on the pressed composite sheet 50 according to the shape of the uneven mold 10; 20; 30; 40. Concave-convex surfaces (52; 54; 58) may be formed in the concave-convex parallel to the rotational direction of the main shaft, the concave-convex surface 56 may be formed concave-convex perpendicular to the rotational direction of the main axis.

After the uneven surface 52; 54; 56; 58 is formed on the composite sheet 50, the composite sheet 50 is attached to the housing 60 (S18). The other surface of the surface on which the uneven surface 52; 54; 56; 58 of the composite sheet 50 is formed is provided with a material such as a composite prepreg or a copper plate. Such a material forms an adhesive force between the composite sheet 50 and the housing 60 upon curing. In addition to these materials, a general adhesive is used to attach the composite sheet 50 and the housing 60. In addition, when using a bearing made of a white metal, the composite plate 50 formed in the mandrel may be fitted and attached to the housing 60.

The embodiments described above are merely illustrative of the preferred embodiments of the present invention, the scope of the present invention is not limited to the described embodiments, those skilled in the art within the spirit and claims of the present invention Various changes, modifications, or substitutions may be made thereto, and such embodiments should be understood as being within the scope of the present invention.

Since the present invention has a space for accommodating wear particles at the interface between the journal bearing and the spindle, it is possible to prevent damage to the spindle due to friction between the abrasive wear particles and the spindle. In addition, the lubricating fluid in the bearing is easily exchanged so that the grinding particles flow out to prevent friction, and the heat formed in the bearing can be easily released to the outside. In addition, the present invention can increase the contact area between the lubricating oil and the bearing to easily release the heat generated in the oil film to the outside can prevent the oil film from thinning. Furthermore, the present invention has a remarkable effect of reducing the wear between the journal bearing and the main shaft by generating a relatively high pressure by the lubricating oil in the bearing even at a low speed.

Claims (14)

A hollow cylinder type housing; A composite journal bearing having an uneven inner surface formed of a composite plate having an uneven surface formed on the inner surface of the housing. The composite journal bearing according to claim 1, wherein the uneven surface has a plurality of uneven inner surfaces formed in parallel with the direction of rotation of the bearing. The composite journal bearing according to claim 1, wherein the concave-convex surface has a plurality of concave-convex inner surfaces formed in a plurality of perpendicular to the direction of rotation of the bearing. The composite journal bearing according to any one of claims 1 to 3, wherein the composite plate has an uneven inner surface attached to a portion of the inner surface of the housing. The composite journal bearing according to claim 1, wherein any one of PTFE, polymer, graphite, MbS ₂ , and PE fiber is formed on the composite plate, and an uneven inner surface is co-cured with the composite plate. Manufacturing an uneven mold; Pressing a composite plate onto the uneven mold; A method of manufacturing a composite journal bearing having an uneven inner surface formed by attaching the composite plate to a hollow cylinder housing. The method of claim 6, wherein the step of manufacturing the uneven mold Arranging circular metal sheets having different diameters; Method of manufacturing a composite journal bearing formed with an uneven inner surface consisting of fixing the circular metal sheet. The method of claim 6, wherein the step of manufacturing the uneven mold Continuously placing the fine metal wires in the mandrel by a predetermined interval; The method of manufacturing a composite journal bearing formed with an uneven inner surface consisting of fixing the fine metal wire to the mandrel. The method of claim 6, wherein the step of manufacturing the uneven mold Disposing a strip-shaped metal sheet formed by staggering irregularities; The method of manufacturing a composite journal bearing formed with an uneven inner surface consisting of fixing the strip-shaped metal sheet. The method of claim 6, wherein the step of manufacturing the uneven mold Releasing the mandrel; Continuously arranging fibrous wires in the mandrel by a predetermined interval; And a method of manufacturing a composite journal bearing having an uneven inner surface formed by co-curing the fine fibers on the composite sheet. According to claim 6, After the step of manufacturing the uneven mold is a method of manufacturing a composite journal bearing formed with an uneven inner surface further comprises the step of releasing by coating a release film on the uneven mold surface or by applying a release material. 12. The method of claim 11, further comprising: co-curing at least one of the plate-shaped composite plate, PTFE, polyimide, phenol resin, carbon reinforced resin, and polyimide fiber after the step of releasing the uneven mold surface. Method for producing a composite journal bearing formed with an uneven inner surface comprising. The method of manufacturing a composite journal bearing according to claim 6, wherein the attaching the composite plate to the hollow cylinder housing comprises forming a concave-convex inner surface to fit the plate-shaped composite plate to the hollow cylinder housing. The method of manufacturing a composite journal bearing according to claim 6, wherein the attaching the composite plate to the hollow cylinder type housing has an uneven inner surface for simultaneously curing the plate-shaped composite plate and the thin prepreg.

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