JP2959165B2 - Oil-free bearing and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oilless bearing, and more particularly to a conductive oilless bearing and a method of manufacturing the same.

[0002]

2. Description of the Related Art In a hinge mechanism for a door, a trunk, a bonnet or the like of an automobile, for example, a bearing having a low sliding friction resistance between a bearing supporting mechanism and a shaft rotating relative to the bearing, particularly an oilless bush bearing is used. Have been.

[0003]

In the case of a non-lubricated bush bearing, for example, when a lubricating coating layer is formed by applying a lubricating synthetic resin to the mesh and the surface of a metal net, Since the lubricating coating layer is electrically insulative, the electrical conductivity between the inner and outer surfaces of the bearing is extremely low. If you try to perform electrostatic painting on a so-called white body at once, including
As a result of the door and other parts such as the car body being electrically insulated by bearings, it may not be possible to paint the door itself, and to apply electrostatic painting to the door at the same time as the car body Requires wiring from a high-voltage power supply to the door, and the workability is extremely poor.

[0004] Such a problem does not occur only in the electrostatic coating of an automobile body, but generally occurs in a case where a combined body combined with a bearing is electrostatically coated.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a shaft and a bearing support mechanism which can support a shaft with low sliding friction resistance for a long period of time. It is an object of the present invention to provide a lubrication-free bearing capable of electrically connecting between the bearings and a method of manufacturing such a bearing.

[0006]

SUMMARY OF THE INVENTION According to the present invention, the above object is achieved by a cylindrical part and an expanding part integrally formed at one end of the cylindrical part.
A flanged cylindrical bearing having a radial flange portion;
Diameter flange portion is made of metal mesh body was used as a base material, Ri Na to form a coating layer on a substrate by filling and covering the synthetic resin composition having a lubricating property in a mesh and the surface of the substrate, One circle of cylindrical part
One of the cylindrical surface and the enlarged-diameter flange portion that continues to this one cylindrical surface
In aspects, some of the mesh body over its entire are smoothly exposed continuously with the surface of the coating layer, the cylindrical portion other
On the other side surface of the enlarged diameter flange portion continuous to the cylindrical surface, a portion of the partially reticulated body is achieved by oilless bearings exposed breaks through the surface of the coating layer.

[0007] In one example, an expanded metal is used as a base material in the present invention, but is not limited to this. For example, a metal net formed by weaving fine metal wires vertically and horizontally is used. There may be. As the metal material constituting these nets, those having slidability and conductivity are preferable, and copper alloys and aluminum alloys are preferable.

The lubricating synthetic resin composition for filling and covering the network and surface of the substrate of the present invention is preferably a synthetic resin composition containing a fluororesin, especially an ethylene tetrafluoride resin as a main component. Polyamide, polyethylene,
It may be a synthetic resin composition in which a filler for improving lubricity is blended with polyacetal or polyurethane resin.

In addition, the surface where a part of the mesh body is smoothly and continuously exposed to the surface of the coating layer over the whole is in direct contact with the shaft and the bearing supporting mechanism, which does not slide relatively. Face. In the case where a part of the mesh body is smoothly and continuously exposed to the surface of the coating layer on one surface of the bearing directly in contact with the one that does not slide relatively in the present invention, in the present invention, the other of the bearing is used. A part of the net is partially exposed on the surface by breaking through the coating layer . When a bearing equipped with flange that having a a diameter flange portion integrally formed at one end of the cylindrical portion and the circular tube portion, a portion of a partially reticulated body on the other side of the bearing When the site to expose breaks through the surface of the coating layer and the enlarged diameter flange portion, on capable of retaining low sliding frictional resistance, have preferred mounting of the shaft easily becomes. In the present invention , a single-flange type may be used, but a flange-less type or a double-flange type may be used instead, and it is needless to say that a shaft to be applied is not limited to a rotating shaft. It is.

[0010] The portion where the part of the net is penetrated and exposed through the surface of the coating layer may be one, but if it is several, the reliability from the viewpoint of conductivity increases and it is preferable. It is not preferable to increase the amount as much as there is a possibility that deterioration of sliding friction resistance, mechanical strength or corrosion resistance may occur.

According to one aspect of the present invention, a bearing is formed of a metal mesh as a base material, and the mesh and the surface of the base material are filled and covered with a synthetic resin composition having lubricity. It is a cylindrical bush bearing formed by winding a lubricating sheet into a cylindrical shape.

[0012] According to the present invention, it is a further object of the present invention to provide a metal net-like body as a base material, the mesh and the surface of which are filled and coated with a synthetic resin composition having lubricity. In the above, a part of the mesh body is smoothly and continuously exposed to the surface of the coating layer over the entire surface, and on the other surface, the bearing element is formed such that the mesh body is entirely covered by the coating layer. A step of preparing a body, and preparing the prepared bearing element by pressing a press die having one of a micro projection and a micro recess corresponding to the micro projection and a micro projection and a micro recess corresponding to the micro projection. Or a step of arranging the coating layer between the press die and the punch, and deforming a part of the mesh body by the minute projections and minute recesses of the press die and the punch. Break through the surface and expose part of the mesh Also achieved by the manufacturing method of the oilless bearing comprising the steps of: allowed to.

[0013] In one of the production methods of the present invention, the step of preparing is a method in which a metal net is used as a base material, and the mesh and surface of the base material are filled and covered with a synthetic resin composition having lubricity. There may be a step of preparing a bearing element by winding the formed flexible lubricating sheet into a cylindrical shape. In this case, the bearing element is a cylindrical element. Further, in one of the manufacturing methods of the present invention, the cylindrical body thus prepared is arranged between the above-mentioned press die and the punch, and at the same time as exposing the cylindrical body, one end of the cylindrical body is expanded by the press die and the punch. Forming a flanged bearing having a cylindrical portion and an enlarged-diameter flange integrally formed at one end of the cylindrical portion. In this case, it is preferable that the mesh-shaped body be formed at the enlarged-diameter flange. So that the part is exposed.

[0014]

In the oil-free bearing of the present invention thus constituted, on one surface of the bearing, a part of the mesh body is exposed smoothly and continuously over the entire surface thereof to the surface of the coating layer.
On the other surface, a part of the mesh is partially exposed through the surface of the coating layer, so that the bearing support disposed on one surface of the bearing, for example, the shaft and the other surface is disposed. As a result of the mechanisms being each in electrical contact with the metal net, the shaft and the bearing support mechanism are electrically connected. Therefore, when the bearing of the present invention is applied to, for example, a hinge mechanism for a door of an automobile, the bearing of the present invention can suitably electrically conduct the door and other automobile bodies.

The present invention will be described below based on preferred embodiments shown in the drawings. This will clarify the invention described above and other inventions.

The present invention is not limited to these specific examples.

[0017]

1 and 2, a bearing 1 has a cylindrical portion 2
The enlarged diameter flange portion 4 which is integrally formed at one end 3 of the cylindrical portion 2 and
A bushing bearing dated flange that having a cylindrical portion 2 and the enlarged diameter flange portion 4, the mesh 6 and the surface 7 of expanded metal 5 to the expanded metal 5 is a mesh-like body made of a copper alloy as a base material
Is filled and coated with an ethylene tetrafluoride resin composition 8 containing a wear resistance improver, and a coating layer 9 is formed on the expanded metal 5.
Is formed. On one cylindrical surface of the cylindrical part 2
On one outer surface 10 and one side surface 11 of the enlarged diameter flange portion 4 continuous with the outer surface 10, a part 12 of the expanded metal 5 is exposed smoothly and continuously to the surface 13 of the coating layer 9 over the whole. . On the other hand, the expanded metal 5 is entirely covered with the coating layer 9 and is the other end of the cylindrical portion 2 .
On the other side surface 15 of the enlarged-diameter flange portion 4 which is continuous with the inner surface 14 which is a cylindrical surface and in which the expanded metal 5 is entirely covered with the coating layer 9 like the inner surface 14, the expanded metal 5 is partially covered. A part 16 is exposed through the surface of the coating layer 9. Further, as shown in FIG. 3, the bearing 1 of the present example has an expanded metal 5 as a base material, and a mesh 6 and a surface 7 of the expanded metal 5 are filled and covered with a tetrafluoroethylene resin composition 8 having lubricity. This is a cylindrically wound bush bearing in which the formed flexible lubricating sheet 17 is wound into a cylindrical shape, and its edges 18 and 19 are brought close to or in contact with each other.

As shown in FIG. 4, for example, the bearing 1 constructed as described above is mounted on an automobile door 20 and an automobile body 21.
In this case, the shaft 23 of the hinge mechanism 22 is inserted into the cylindrical portion 2 of the bearing 1, and the enlarged-diameter flange portion 4 is connected to the door 20 and the metal bearing support by the hinge mechanism 22. It is located between the mechanism 24.

Thus, in the bearing 1 of the present embodiment in which the portion where the part 16 of the expanded metal 5 penetrates through the surface of the coating layer 9 and is exposed is present in the enlarged diameter flange portion 4, the vehicle body 2
1 and the expanded metal 5 are connected to the door 20 and the expanded metal 5 via the bearing support mechanism 24 and the part 12.
Are electrically connected to each other via the portion 16,
The car body 21 and the door 20 are also electrically connected via the expanded metal 5, so that when the car body 21 is assembled with the door 20 and these are simultaneously subjected to electrostatic coating (such coating is generally applied). In this case, the bearing 1 does not become an electrical insulator, and only one of the vehicle body 21 and the door 20 needs to be wired from a high-voltage power supply. Further, since the part 16 of the expanded metal 5 is formed of an elastic-plastic metal such as a copper alloy, even if an overload is applied to the part 16 during sliding, the part 16 of the copper alloy is formed. Does not adversely affect the sliding friction resistance of the oilless bearing because it undergoes elasto-plastic deformation.

Hereinafter, a method of manufacturing the bearing 1 will be described.
A cylindrical body 30 serving as a body of the bearing 1 as shown in FIG. 5 is prepared. The cylindrical body 30 may be formed by winding the flexible lubricating sheet 17 into a cylindrical shape as described above with reference to FIG. Note that, on one surface, the flexible lubricating sheet 17 over which the part 12 of the expanded metal 5 is exposed smoothly and continuously to the surface of the coating layer 9 does not include an abrasion resistance improver. Placing the sintered tetrafluoroethylene resin composition in the form of a powder on the surface of the expanded metal 5, rolling it between two metal rolls, and then sintering the tetrafluoroethylene resin composition Can be manufactured by Next, as shown in FIG. 5, a cylindrical portion 31 is provided on the upper surface, and a hole 3 is provided in the central portion.
2 and a press die 36 having a hole 34 fitted into the cylindrical portion 31 of the press die 33 and a minute projection 35 on the upper surface are prepared.
The cylindrical body 30 prepared previously is fitted into the above. After this fitting, as shown in FIG. 6, the cylindrical portion 37 of the punch 39 having the cylindrical portion 37 and a truncated conical portion 38 continuous with the cylindrical portion 37 is fitted into the cylindrical body 30 and the cylindrical portion 30 protruding from the hole 34. Is expanded radially outward by the frusto-conical portion 38 of the punch 39. After the expansion, as shown in FIG. 7, a cylindrical portion 41 and a cylindrical portion 43 which is continuous with the cylindrical portion 41, has a larger diameter than the cylindrical portion 41, and has a minute recess 42 corresponding to the minute projection 35 on the lower surface are provided. The punch 44 is further prepared, and the cylindrical body 30 whose one end 40 is enlarged in diameter is arranged between the punch 44 and the press die 36. Then, while the cylindrical portion 41 of the punch 44 is inserted into the cylindrical body 30, the one end 40 whose diameter has been previously enlarged is further expanded by the cylindrical portion 43, and the cylindrical portion 41 of the punch 44 is further inserted into the cylindrical body 30. Finally, as shown in FIG. 8 and FIG.
The part 16 of the expanded metal 5 in the coating layer 9 is deformed by the minute recess 42 of the cylindrical part 43 and the minute protrusion 35 of the press die 36, and this deformation causes one surface of the cylindrical body 30, in other words, to expand. The bearing 1 is obtained by piercing the surface of the coating layer 9 with the side surface 15 of the diameter flange 4 to expose a part 16 of the expanded metal 5.

It is to be noted that a punch which is separate from the formation of the enlarged-diameter flange 4 and the deformation of the expanded metal 5 is prepared, and after the expanded-diameter flange 4 is formed by the punch for forming the enlarged-diameter flange, the expanded metal 5 is deformed. The work may be performed with another punch.

[0022]

As described above, according to the oil-free bearing of the present invention, on one surface of the bearing, a part of the metal mesh is smoothly continuous with the surface of the coating layer over the entire surface. It is exposed, and on the other side, a part of the mesh body partially penetrates the surface of the coating layer and is exposed, so that the supporting shaft and the supporting mechanism that supports the bearing are electrically reliably connected. As a result, wiring work becomes easy in work such as electrostatic painting,
Workability can be improved. In addition, since the bearing is formed by forming a coating layer on the base material by filling and coating a synthetic resin composition having lubricity on the mesh and surface of the base material with a metal mesh as a base material, The shaft can be supported with low sliding frictional resistance over a wide range.

[Brief description of the drawings]

FIG. 1 is a perspective view of one preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view of the specific example shown in FIG.

FIG. 3 is a partial sectional perspective view of a flexible lubricating sheet.

FIG. 4 is an explanatory diagram of a usage example of the specific example shown in FIG. 1;

FIG. 5 is an explanatory diagram of a preferred method for manufacturing an oilless bearing of the present invention.

FIG. 6 is an explanatory diagram of a preferred method of manufacturing an oilless bearing of the present invention.

FIG. 7 is an explanatory diagram of a preferred method of manufacturing an oilless bearing of the present invention.

FIG. 8 is an explanatory view of a preferred method of manufacturing the oilless bearing of the present invention.

FIG. 9 is an enlarged sectional view of a portion A shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing 5 Expanded metal 9 Coating layer 12 Part 16 Part

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-34516 (JP, A) JP-A-60-37416 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16C 33/20 F16C 33/20

Claims (3)

(57) [Claims] 1. A cylindrical portion and one end of the cylindrical portion are integrally formed.
A flanged cylindrical bearing having a formed enlarged-diameter flange portion,
The cylindrical portion and the enlarged-diameter flange portion are made of a metal mesh as a base material, and the mesh and surface of the base material are filled and covered with a synthetic resin composition having lubricity to form a coating layer on the base material. Do Ri, the cylindrical portion
One of the cylindrical surfaces and an enlarged-diameter flange connected to the one cylindrical surface
In one side face of the part, a part of the mesh body are exposed continuously smooth the surface of the coating layer over its entire cylindrical
On the other side surface of the enlarged diameter flange portion continuous to the other of the cylindrical surface of the part, partially oilless bearing part of the mesh body is exposed by breaking through the surface of the coating layer. 2. A cylindrical bearing comprises a metal mesh as a base material, and a flexible lubricating sheet formed by filling and covering a synthetic resin composition having lubricity on the mesh and surface of the base material. The oilless bearing according to claim 1, which is a cylindrical bushing bearing wound in a cylindrical shape. 3. A metal net-like body is used as a base material, and the mesh and the surface of the base material are filled with a synthetic resin composition having lubricity.
On one side, a part of the net is exposed to the surface of the coating layer smoothly and continuously over the entire surface, and on the other side, the net is coated over the entire surface. A step of preparing a bearing element covered with a layer, and applying the prepared bearing element to a press die having one of a micro projection and a micro recess corresponding to the micro projection, the micro projection, and the micro projection. A step of arranging it between a punch having one of the corresponding minute recesses and a punch, and a part of the mesh body being deformed by the minute projections and the minute recesses of the press die and the punch; Exposing a part of the mesh body by piercing the surface of the coating layer on the other surface of the oil-free bearing.