JP4538960B2 - Sliding bearing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sliding bearing structure that exhibits low friction.
[0002]
[Problems to be solved by the invention]
A rolling bearing or a sliding bearing is used to support the rotating shaft and the like in a freely rotatable manner. However, since the rolling bearing has a low frictional resistance, the rotating shaft and the like can be supported extremely smoothly and freely. On the other hand, there is a problem of rolling noise. On the other hand, the sliding bearing can realize low friction at a low price and is used in many parts without the problem of rolling noise.
[0003]
A sliding bearing made of a synthetic resin having a low friction coefficient in a sliding bearing can achieve a low friction equivalent to that of a rolling bearing, but a rotating shaft that is rotatably supported by such a sliding bearing made of synthetic resin, etc. As a result of the fact that the material of the mating material is often made of metal, the sliding surface between the synthetic resin sliding bearing and the mating material is a combination of synthetic resin and metal, resulting in low friction due to the synthetic resin sliding bearing. Sex is not used as effectively.
[0004]
The present invention has been made in view of the above-mentioned points, and the object of the present invention is to provide a sliding surface between synthetic resins regardless of the type of material of a mating material such as a rotating shaft to be rotatably supported. It is possible to provide a sliding bearing structure that can sufficiently utilize the low friction property of the synthetic resin and that can realize low friction equivalent to that of a rolling bearing at low cost.
[0005]
[Means for Solving the Problems]
A sliding bearing structure according to a first aspect of the present invention includes a cylindrical sleeve made of a synthetic resin having an inner peripheral cylindrical surface and an outer peripheral cylindrical surface and having annular flanges at both axial end portions of the outer peripheral cylindrical surface; The inner peripheral cylindrical surface has a cylindrical bearing bush made of synthetic resin, and the cylindrical bearing bush is slidably in contact with the outer peripheral cylindrical surface of the cylindrical sleeve. The sliding surface of the synthetic resin is formed between the cylindrical sleeve and the outer peripheral cylindrical surface of the cylindrical sleeve, and the outer peripheral cylindrical surface is protruded in the radial direction from the outer peripheral surface of the annular flange of the cylindrical sleeve, It is arranged on the outer peripheral cylindrical surface of the cylindrical sleeve.
[0006]
According to the sliding bearing structure of the first aspect, at least the inner peripheral cylindrical surface is formed of a synthetic resin so as to form a sliding surface between the synthetic resins with the outer peripheral cylindrical surface of the cylindrical sleeve. Because it has a bearing bush, a sliding surface between synthetic resins can be secured regardless of the type of material of the mating material such as the rotating shaft that is to be supported rotatably, and low friction due to the synthetic resin is sufficient. It can be used, and at the same time, low friction equivalent to that of a rolling bearing can be realized at low cost.
[0007]
In the sliding bearing structure according to the first aspect, the cylindrical bearing bush is formed of a thin steel plate and a porous body integrally formed on the thin steel plate as in the sliding bearing structure according to the second aspect of the present invention. It may be a cylindrical wound bush consisting of a three-layer structure of a porous metal sintered layer and a synthetic resin layer impregnated and coated with the porous metal sintered layer, the synthetic resin layer being wound inside, Even if the synthetic resin layer of the cylindrical wound bush composed of this three-layer structure is made of polytetrafluoroethylene resin as in the sliding bearing structure of the third aspect of the present invention, the synthetic resin layer of the fourth aspect of the present invention. Like a plain bearing structure, the main component may be polytetrafluoroethylene resin, and 30 to 50% by weight of a soft metal may be contained therein.
[0008]
When the synthetic resin layer is impregnated and coated on the porous metal sintered layer as in the sliding bearing structure of the second aspect, the synthetic resin layer is firmly fixed over a long period of time due to the anchoring effect. Therefore, there is no inconvenience such as peeling of the synthetic resin layer, the characteristics of the inner peripheral cylindrical surface of the synthetic resin of the cylindrical bearing bush can be maintained for a long time, and the cylindrical bearing bush is cylindrical. When it is a wound bush, it becomes easy to mount the cylindrical bearing bush on the outer peripheral cylindrical surface of the cylindrical sleeve.
[0009]
The soft metal contained in the polytetrafluoroethylene resin is preferably lead powder, but is not limited thereto, and may be, for example, graphite powder.
[0010]
In the sliding bearing structure according to the first aspect, the cylindrical bearing bush is replaced with a cylindrical winding bush, as in the sliding bearing structure according to the fifth aspect of the present invention. And a synthetic resin coating film formed on the inner peripheral cylindrical surface, wherein the coating film is preferably made of polytetrafluoro, like the plain bearing structure of the sixth aspect of the present invention. It consists of at least one synthetic resin selected from ethylene resin, epoxy resin, polyamide resin, melamine resin, urea resin, acrylic resin, ABS resin, polyethylene resin, polycarbonate resin and polyacetal resin.
[0011]
Such a coating film is preferably formed by electrostatic coating, electrodeposition coating (cationic coating) or baking coating as in the sliding bearing structure of the seventh aspect of the present invention. It does not exclude other forming methods.
[0012]
In the sliding bearing structure of the first aspect, the cylindrical sleeve is preferably a polyacetal resin, a polyethylene resin, a polyamide resin, a polyphenylene sulfide resin, a polyether ketone, as in the sliding bearing structure of the eighth aspect of the present invention. It consists of at least 1 synthetic resin selected from resin and polyether sulfone resin.
[0013]
In the present invention, the cylindrical sleeve may be formed with at least two slit grooves extending in the axial direction from one end face as in the sliding bearing structure of the ninth aspect of the present invention. Since the cylindrical sleeve can be reduced in diameter by the slit groove, the insertion property of the cylindrical sleeve to the cylindrical bearing bush, particularly the insertion property to the cylindrical bearing bush made of a cylindrical seamless metal pipe can be improved.
[0014]
The outer peripheral cylindrical surface of the cylindrical sleeve may be a smooth surface, but may have a plurality of convex surfaces as in the sliding bearing structure of the tenth aspect of the present invention. The convex surfaces are arranged at equal intervals in the axial direction with each other, as in the sliding bearing structure of the eleventh aspect of the present invention, and a plurality of projecting ridge surfaces each extending in the circumferential direction. You may have.
[0015]
When the outer peripheral cylindrical surface of the cylindrical sleeve has such a plurality of convex surfaces, a recess other than the plurality of convex surfaces can be used as a lubricating grease reservoir, and the lubricating grease can be applied to the sliding surface between the synthetic resins. Can be supplied as appropriate.
[0016]
The plurality of convex surfaces are distributed over the entire surface of the outer peripheral cylindrical surface, preferably uniformly or irregularly distributed, as in the sliding bearing structure according to the twelfth aspect of the present invention, instead of the projecting surface. A plurality of irregular convex surfaces may be provided, and a preferable example of the irregular convex surfaces is an outer peripheral cylinder that can uniformly supply lubricating grease to the sliding surfaces of synthetic resins. A convex surface in which the entire surface has a wrinkle shape can be mentioned.
[0017]
The sliding bearing structure of the present invention may further include an outer sleeve fitted to the outer peripheral cylindrical surface of the cylindrical bearing bush, like the sliding bearing structure of the thirteenth aspect of the present invention. The outer sleeve is preferably made of metal as in the sliding bearing structure of the fourteenth aspect of the present invention, but is not necessarily limited to this. In addition, the inner peripheral surface of the outer sleeve is a cylindrical bearing bush. A cylindrical shape complementary to the outer peripheral cylindrical surface of the outer sleeve is preferable, and the outer peripheral surface of the outer sleeve is also preferably cylindrical, but is matched to the shape of the counterpart material such as a rotating shaft to be rotatably supported. Other shapes such as a rectangular tube may be used.
[0018]
Next, the present invention will be described in more detail based on preferred specific examples shown in the drawings, but the present invention is not limited to these specific examples.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2, the sliding bearing structure 1 of this example includes a synthetic resin having an inner peripheral cylindrical surface 2 and an outer peripheral cylindrical surface 3, and annular flanges 4 and 5 at both axial ends of the outer peripheral cylindrical surface 3. A cylindrical sleeve 6 made of metal and a cylindrical bearing bush 8 having an inner peripheral cylindrical surface 7 made of synthetic resin are provided.
[0020]
The cylindrical sleeve 6 is integrally formed from at least one synthetic resin selected from polyacetal resin, polyethylene resin, polyamide resin, polyphenylene sulfide resin, polyether ketone resin, and polyether sulfone resin. Both the inner peripheral cylindrical surface 2 and the outer peripheral cylindrical surface 3 are smooth surfaces without irregularities. At least one of the annular flanges 4 and 5, in this example, one end 9 of the annular flange 4 serves as a guide surface when the cylindrical bearing bush 8 is inserted into the inner peripheral cylindrical surface 7. An annular tapered surface 10 is formed.
[0021]
As shown in FIG. 3, the cylindrical bearing bush 8 includes a thin steel plate 11, a porous metal sintered layer 12 integrally formed on the thin steel plate 11, and an impregnated coating on the porous metal sintered layer 12. A strip-shaped plate having a three-layer structure with the synthetic resin layer 13 is wound with the synthetic resin layer 13 inside, and is a cylindrical wound bush having butted surfaces 14 and 15. In this example, 13 is made of polytetrafluoroethylene resin.
[0022]
The synthetic resin layer 13 may be composed of a polytetrafluoroethylene resin as a main component and 30 to 50% by weight of a soft metal.
[0023]
The cylindrical bearing bush 8 is a two-layer structure in which a synthetic resin layer is integrally deposited on a thin steel plate 11 by electrostatic coating, electrodeposition coating or baking coating, which will be described later, instead of a three-layer cylindrical winding bush. A cylindrical wound bush obtained by winding a strip-shaped plate having a structure with the synthetic resin layer inside may be used.
[0024]
The cylindrical bearing bush 8 has one end face in the axial direction opposed to the annular flange 4 at one end of the cylindrical sleeve 6 in the axial direction, while the other end face in the axial direction is opposed to the cylindrical sleeve 6. The annular flange 5 at the other end is opposed to the annular flange 5 in the axial direction, and is arranged on the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6 between the annular flanges 4 and 5, and as shown in FIG. For example, the rotary shaft 21 and the tube are supported so as to be supported on the inner peripheral surface 23 of the tube 22 as a support member via the slide bearing structure 1 of the present example so as to be rotatable in the R direction around the axis 28. When the sliding bearing structure 1 is inserted between the inner peripheral surface 23 of the inner sleeve 23 and the abutting surfaces 14 and 15 are close to each other, the inner peripheral cylindrical surface 7 of the cylindrical sleeve 6 is reduced. The cylindrical three is slidably brought into contact with the outer cylindrical surface 3. A sliding surface between the synthetic resins is formed between the outer peripheral cylindrical surface 3 and the outer peripheral cylindrical surface 25, and the outer peripheral cylindrical surface 25 protrudes radially from the outer peripheral surface 26 of the annular flanges 4 and 5 of the cylindrical sleeve 6. It has become.
[0025]
As shown in FIG. 4, the above-described sliding bearing structure 1 has a cylindrical sleeve 6 fitted on the surface 27 of the rotating shaft 21 at its inner circumferential cylindrical surface 2, and a cylindrical bearing bush 8 at its outer circumferential cylindrical surface 25. It is fitted on the inner peripheral surface 23 of the tube 22 and is inserted between the rotating shaft 21 and the tube 22 to be used as a radial bearing. When the relative rotation in the R direction around the shaft center 28 occurs between the rotating shaft 21 and the tube 22, the sliding bearing structure 1 and the cylindrical bearing bush 3 and the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6 are used. Similarly, a sliding in the R direction centering on the shaft center 28 is caused between the inner peripheral cylindrical surface 7 and the inner peripheral cylindrical surface 7 to ensure a smooth relative rotation between the rotating shaft 21 and the tube 22.
[0026]
According to the sliding bearing structure 1, the cylindrical bearing bush 8 having the inner peripheral cylindrical surface 7 made of synthetic resin is formed so as to form a sliding surface of synthetic resin with the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6. Because it is provided, it can be a sliding surface between synthetic resins regardless of the type of material of the rotating shaft 21 or the tube 22 that is to be rotatably supported, and the low friction property by the synthetic resin can be fully utilized. Moreover, a low friction equivalent to that of a rolling bearing can be realized at a low price, and a synthetic resin layer 13 having a surface that becomes the inner peripheral cylindrical surface 7 of the cylindrical bearing bush 8 is formed into the porous metal sintered layer 12. When impregnated, the synthetic resin layer 13 is firmly held on the porous metal sintered layer 12 for a long time due to the anchoring effect, and thus there is no inconvenience such as peeling of the synthetic resin layer 13 and the cylinder. Cylindrical bushing 8 with synthetic resin 7 can be maintained over a long period of time, and the cylindrical bearing bush 8 is a cylindrical winding bush, and an annular tapered surface 10 is formed at one end 9 of the annular flange 4. Further, it is very easy to mount the cylindrical bearing bush 8 on the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6.
[0027]
The above example is the sliding bearing structure 1 in which the cylindrical bearing bush 8 is directly fitted to the inner peripheral surface 23 of the tube 22 by the outer peripheral cylindrical surface 25. Instead, as shown in FIGS. Further, as shown in FIG. 7, the cylindrical sleeve 6 has an inner circumference as a slide bearing structure 32 in which a metal outer sleeve 31 is fitted to the outer circumference cylindrical surface 25 of the cylindrical bearing bush 8 with the inner circumference cylindrical surface 33. The cylindrical surface 2 is fitted to the surface 27 of the rotating shaft 21, and the outer sleeve 31 is fitted to the inner circumferential surface 23 of the tube 22 by the outer circumferential cylindrical surface 34, and thus between the rotating shaft 21 and the tube 22. The sliding bearing structure 32 may be inserted and the sliding bearing structure 32 may be used as a radial bearing.
[0028]
Even in the sliding bearing structure 32, the cylindrical bearing bush 8 has an inner peripheral cylindrical surface 7 slidably brought into contact with the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6 and between the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6. Are formed so that the outer peripheral cylindrical surface 25 protrudes in the radial direction from the outer peripheral surface 26 of the annular flanges 4 and 5 of the cylindrical sleeve 6. When relative rotation in the R direction around the shaft center 28 occurs between the tube 22 and the tube 22, the same occurs between the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6 and the inner peripheral cylindrical surface 7 of the cylindrical bearing bush 8. Sliding in the R direction around the shaft center 28 is generated to ensure a smooth relative rotation between the rotating shaft 21 and the tube 22.
[0029]
In the slide bearing structures 1 and 32, the cylindrical bearing bush 8 made of a cylindrical winding bush is used. Instead, as shown in FIGS. 8 and 9, a cylindrical seamless metal pipe 41 and a metal pipe 41 are used. The sliding bearing structure 45 may be configured by using a cylindrical bearing bush 44 formed of a synthetic resin coating film 43 formed on the inner peripheral cylindrical surface 42 of the inner peripheral cylindrical surface 42. The coating film 43 having the surface is at least one selected from polytetrafluoroethylene resin, epoxy resin, polyamide resin, melamine resin, urea resin, acrylic resin, ABS resin, polyethylene resin, polycarbonate resin, and polyacetal resin. Preferably, the synthetic resin coating film 43 is formed by electrostatic coating, electrodeposition coating or baking. It is formed by instrumentation.
[0030]
In the sliding bearing structure 45 as well as the sliding bearing structures 1 and 32, the cylindrical bearing bush 44 slides on the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6 on the inner peripheral cylindrical surface 7 that is the surface of the coating film 43. A sliding surface of synthetic resin is formed between the cylindrical sleeve 6 and the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6, and the outer peripheral cylindrical surface 25 is connected to the outer periphery of the annular flanges 4 and 5 of the cylindrical sleeve 6. The slide bearing structure 45 having the cylindrical bearing bush 44 is protruded in the radial direction from the surface 26, and is inserted between the rotary shaft 21 and the tube 22 shown in FIG. 4 as a radial bearing. When used, when relative rotation in the R direction about the axis 28 occurs between the rotary shaft 21 and the tube 22, the outer cylindrical surface 3 of the cylindrical sleeve 6 and the cylindrical bearing bush 44 are coated. Inner circumference that is the surface of the film 43 And causing sliding in the R direction, which also centered on the axis 28 between the surface 7 so as to ensure smooth relative rotation between the rotary shaft 21 and the tube 22.
[0031]
When the cylindrical bearing bush 44 having the cylindrical seamless metal pipe 41 shown in FIGS. 8 and 9 is used, the cylindrical sleeve 6 has at least two axially extending from one end face 46 thereof. When the two slit grooves 47 and 48 in this example are formed, the cylindrical sleeve 6 can be reduced in diameter by the slit grooves 47 and 48, so that the cylindrical sleeve 6 is inserted into the cylindrical bearing bush 44. It is possible to improve the properties.
[0032]
In any of the slide bearing structures 1, 32 and 45, the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6 is a smooth surface without irregularities. Instead, as shown in FIGS. A plurality of convex surfaces 51 may be provided.
[0033]
The sliding bearing structure 52 shown in FIG. 10 is arranged on the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6 in the sliding bearing structure 32 at an equal interval in the axial direction as shown in FIG. A plurality of protrusions 53, each extending continuously in the circumferential direction, are integrally formed, and the top surface of the protrusion 53 is slidably in contact with the inner peripheral cylindrical surface 7 of the cylindrical bearing bush 8. The plurality of convex surfaces 51 constituting a part of the outer cylindrical surface 3 of the cylindrical sleeve 6 are arranged at equal intervals in the axial direction and are each circumferential. It consists of a plurality of ridge surfaces extending in the direction.
[0034]
In the sliding bearing structure 52 shown in FIG. 10, recesses other than the plurality of convex surfaces 51 in the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6 can be used as lubrication grease reservoirs, and the lubricating grease is provided on the sliding surfaces between the synthetic resins. Can be supplied as appropriate.
[0035]
Instead of the annular convex surface 51 shown in FIGS. 10 and 11, as shown in FIG. 12 and FIG. 13, it is uniformly distributed over the entire surface of the outer peripheral cylindrical surface 3 of the cylindrical sleeve 6 and is indefinite. A plurality of protrusions 55 may be integrally formed, and the top surface of the protrusions 55 may be a convex surface 51 slidably contacting the inner peripheral cylindrical surface 7 of the cylindrical bearing bush 8. The convex surface 51 is a plurality of irregular convex surfaces evenly distributed over the entire surface of the outer peripheral cylindrical surface 3, in other words, the entire surface of the outer peripheral cylindrical surface 3 is a convex surface having a wrinkle shape. According to the plurality of convex surfaces 51 shown in FIG. 12 and FIG. 13, when the grooves 56 that are all continuous with each other surrounding the convex surface 51 are used as a grease reservoir for lubrication, the lubricating grease is applied to the sliding surfaces between the synthetic resins. It becomes possible to supply evenly.
[0036]
【The invention's effect】
According to the present invention, it can be used as a sliding surface between synthetic resins regardless of the type of material of the counterpart material such as a rotating shaft to be rotatably supported, and the low friction property by the synthetic resin can be fully utilized. Thus, it is possible to provide a sliding bearing structure capable of realizing low friction equivalent to that of a rolling bearing at a low price.
[Brief description of the drawings]
1 is a cross-sectional view taken along the line I-I shown in FIG. 2 of a preferred example of an embodiment of the present invention.
2 is a cross-sectional view taken along the line II-II of the example shown in FIG.
FIG. 3 is an explanatory diagram of the manufacturing method of the example shown in FIG. 1;
FIG. 4 is an operation explanatory diagram of the example shown in FIG. 1;
FIG. 5 is a cross-sectional view taken along line VV shown in FIG. 6 of another preferable example of the embodiment of the present invention.
6 is a cross-sectional view taken along the line VI-VI of the example shown in FIG.
7 is an operation explanatory diagram of the example shown in FIG.
8 is a cross-sectional view taken along line VIII-VIII shown in FIG. 9 of still another preferred example of the embodiment of the present invention.
9 is a cross-sectional view taken along line IX-IX in the example shown in FIG.
FIG. 10 is a cross-sectional view of still another preferred example of an embodiment of the present invention.
11 is a development explanatory view of the outer peripheral cylindrical surface of the cylindrical sleeve having the convex surface shown in FIG. 10;
FIG. 12 is a development explanatory view of another example of the convex surface of the outer peripheral cylindrical surface of the cylindrical sleeve.
13 is a cross-sectional explanatory view of a convex surface of the outer peripheral cylindrical surface of the cylindrical sleeve shown in FIG. 12;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sliding bearing structure 2 Inner cylindrical surface 3 Outer cylindrical surface 4, 5 Annular collar 6 Cylindrical sleeve 7 Inner cylindrical surface 8 Cylindrical bearing bush

Claims (13)

  A cylindrical sleeve made of synthetic resin having an inner circumferential cylindrical surface and an outer circumferential cylindrical surface and having annular flanges at both axial ends of the outer circumferential cylindrical surface, and a cylindrical bearing bush having at least an inner circumferential cylindrical surface made of synthetic resin The cylindrical bearing bush is coated with a thin steel plate, a porous metal sintered layer integrally formed on the thin steel plate, and the porous metal sintered layer impregnated with the porous metal sintered layer. A cylindrically wound bush consisting of a three-layer structure with a synthetic resin layer, wound around with the synthetic resin layer inside, and having its inner cylindrical surface slidably contacted with the outer cylindrical surface of the cylindrical sleeve Forming a sliding surface between the synthetic resin and the outer peripheral cylindrical surface of the cylindrical sleeve, and projecting the outer peripheral cylindrical surface radially from the outer peripheral surface of the annular flange portion of the cylindrical sleeve, and , One end surface in the axial direction is one end of the cylindrical sleeve While the annular flange is opposed to the annular flange in the axial direction, the other end surface in the axial direction is opposed to the annular flange of the other end of the cylindrical sleeve in the axial direction, and the annular flanges at both ends of the cylindrical sleeve are The annular sleeve is arranged on the outer peripheral cylindrical surface of the cylindrical sleeve, and an annular flange serving as a guide surface when the cylindrical sleeve is inserted into the inner peripheral cylindrical surface of the cylindrical bearing bush A sliding bearing structure in which a tapered surface is formed.   The sliding bearing structure according to claim 1, wherein the synthetic resin layer is made of polytetrafluoroethylene resin.   The sliding bearing structure according to claim 1, wherein the synthetic resin layer contains polytetrafluoroethylene resin as a main component and contains 30 to 50% by weight of a soft metal.   The sliding bearing structure according to any one of claims 1 to 3, wherein the cylindrical sleeve is formed with at least two slit grooves extending in an axial direction from one end face.   A cylindrical sleeve made of synthetic resin having an inner circumferential cylindrical surface and an outer circumferential cylindrical surface and having annular flanges at both axial ends of the outer circumferential cylindrical surface, and a cylindrical bearing bush having at least an inner circumferential cylindrical surface made of synthetic resin The cylindrical bearing bush includes a cylindrical seamless metal pipe and a synthetic resin coating film formed on the inner peripheral cylindrical surface of the metal pipe. The outer peripheral cylindrical surface of the cylindrical sleeve is slidably brought into contact with the outer peripheral cylindrical surface of the cylindrical sleeve to form a sliding surface between the synthetic resins, and the outer peripheral cylindrical surface is formed into an annular groove of the cylindrical sleeve. One end surface in the axial direction is opposed to the annular flange of one end portion of the cylindrical sleeve in the axial direction while the other end surface in the axial direction is projected from the outer peripheral surface of the portion. The other of the cylindrical sleeve It is arranged on the outer peripheral cylindrical surface of the cylindrical sleeve between the annular flanges at both ends of the cylindrical sleeve so as to face the annular flange of the end portion in the axial direction. At least two slits extending in the axial direction are formed in the annular flange on one end face side of the cylindrical sleeve, and the cylindrical sleeve to the inner peripheral cylindrical surface of the cylindrical bearing bush A sliding bearing structure in which an annular taper surface is formed as a guide surface when inserting and attaching.   The paint film is made of at least one synthetic resin selected from polytetrafluoroethylene resin, epoxy resin, polyamide resin, melamine resin, urea resin, acrylic resin, ABS resin, polyethylene resin, polycarbonate resin, and polyacetal resin. Item 6. The plain bearing structure according to Item 5.   The sliding bearing structure according to claim 5 or 6, wherein the coating film of the synthetic resin is formed by electrostatic coating, electrodeposition coating, or baking coating.   The cylindrical sleeve is made of at least one synthetic resin selected from polyacetal resin, polyethylene resin, polyamide resin, polyphenylene sulfide resin, polyether ketone resin, and polyether sulfone resin. The sliding bearing structure described in 1.   The sliding bearing structure according to any one of claims 1 to 8, wherein an outer peripheral cylindrical surface of the cylindrical sleeve has a plurality of convex surfaces.   The sliding bearing structure according to claim 9, wherein the plurality of convex surfaces are arranged at equal intervals in the axial direction, and each has a plurality of protruding surface extending in the circumferential direction.   The sliding bearing structure according to claim 9, wherein the plurality of convex surfaces have a plurality of regular or irregular convex surfaces dispersed over the entire surface of the outer peripheral cylindrical surface.   The sliding bearing structure according to any one of claims 1 to 11, further comprising an outer sleeve fitted to an outer peripheral cylindrical surface of the cylindrical bearing bush.   The slide bearing structure according to claim 12, wherein the outer sleeve is made of metal.

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