JPH04285317A - Oilless bearing and its manufacture - Google Patents

Abstract

PURPOSE:To provide an oilless bearing and its manufacture which can rotatably support a rotating shaft in a low frictional state for a long term, and electrically connect the rotatably supported rotating shaft to a bearing supporting mechanism. CONSTITUTION:A synthetic resin composition 8 having lubricating ability is filled up and coated on the network 6 and surface 7 of an expanded metal 5 to form a coated layer 9 for producing an oilless bearing 1. On either face 11 of the inner and outer faces of the bearing 1, a part 12 of the expanded metal 5 is exposed extending over the face 11 so as to smoothly follow the surface 13 of the coated layer 9. On the other face 15, a part 16 of the expanded metal 5 partially breaks through the coated layer 9 for its exposure.

Description

[Detailed description of the invention]

0001

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

0002

[Prior Art] For example, in hinge mechanisms for automobile doors, trunks, bonnets, etc., bearings with low sliding friction resistance, especially oil-free bush bearings, are used between the bearing support mechanism and the shaft that rotates relative to the bearing support mechanism. It is being

0003

[Problems to be Solved by the Invention] By the way, when an oil-free bush bearing is used, for example, when a lubricating synthetic resin is applied to the mesh and surface of a metal mesh body to form a lubricating coating layer, Since the lubricating coating layer has electrical insulation properties, the electrical conductivity between the inner and outer surfaces of the bearing is extremely low. For example, such a bearing can be applied to the hinge mechanism of an automobile door. If you try to perform electrostatic painting on the so-called white body at the same time,
As a result of the door and other parts of the car body being electrically insulated by the bearing, the door itself may not be able to be painted. In this case, the wiring from the high voltage power supply must also be connected to the door, which is extremely difficult to work with.

[0004] Such a problem does not only occur in electrostatic painting of automobile bodies, but generally occurs in electrostatic painting of an assembly assembled via a bearing.

The present invention has been made in view of the above-mentioned points, and its object is to support a shaft with low sliding friction resistance over a long period of time, and to provide a structure in which the shaft to be supported and the bearing support mechanism An object of the present invention is to provide an oil-free bearing that can electrically connect between the bearings and a method for manufacturing such a bearing.

[0006]

[Means for Solving the Problems] According to the present invention, the above object is achieved by using a metal mesh as a base material, and filling and coating the mesh and surface of this base material with a synthetic resin composition having lubricating properties. A bearing is formed by forming a coating layer on a base material, and on one side of the bearing, a part of the net-like body is exposed smoothly and continuously with the surface of the coating layer, and on the other side. On the surface, this is partly achieved by oil-free bearings in which part of the mesh is exposed by breaking through the surface of the coating layer.

[0007] The net-like body as a base material in the present invention uses expanded metal in one example, but is not limited to this, and may be, for example, a wire mesh formed by weaving thin metal wires in all directions. It's okay. The metal material constituting these net-like bodies preferably has sliding properties and electrical conductivity, and copper alloys and aluminum alloys are preferred.

[0008] As the synthetic resin composition having lubricating properties to fill and coat the mesh and surface of the base material of the present invention, a synthetic resin composition containing a fluororesin, particularly a tetrafluoroethylene resin as a main component, is preferable, and other synthetic resin compositions are preferably used. polyamide, polyethylene,
It may also be a synthetic resin composition in which a filler for improving lubricity is blended with polyacetal or polyurethane resin.

[0009] In addition, as a surface where a part of the net-like body is exposed smoothly and continuously with the surface of the coating layer, it is in direct contact with the shaft and the bearing support mechanism that do not slide relatively. on the other side. In this way, if a part of the net-like body is exposed smoothly and continuously with the surface of the coating layer on one side of the bearing that comes into direct contact with the side that does not slide relatively, in the present invention, A part of the net-like body is partially pierced through the coating layer at the surface to be exposed. When the bearing of the present invention is a flanged bearing that integrally has a cylindrical portion and an enlarged-diameter flange portion at one end of the cylindrical portion, a portion of the net-like body is partially formed on the other surface of the bearing. It may be preferable to use the enlarged-diameter flange as the portion exposed by breaking through the surface of the coating layer, as this not only maintains low sliding frictional resistance but also facilitates attachment of the shaft. still,
The bearing of the present invention may be of a single flange type, but instead of this, it may be of no flange type or of a double flange type.
In addition, it goes without saying that the applicable axis is not limited to a rotating axis.

[0010] The number of parts of the network to be exposed by breaking through the surface of the coating layer may be just one, but it is preferable to have a few parts because reliability increases from the viewpoint of conductivity, but if there are too many parts, It is not preferable to use too much because there is a risk of deterioration of sliding friction resistance, decrease in mechanical strength, or decrease in corrosion resistance.

[0011] In one aspect of the present invention, the bearing is a flexible bearing formed by using a metal mesh as a base material, and filling and coating the mesh and surface of the base material with a synthetic resin composition having lubricating properties. This is a cylindrical bush bearing made by winding a lubricating sheet into a cylindrical shape.

According to the present invention, the above-mentioned object is further achieved by using a metal mesh as a base material, the mesh and the surface of this base material being filled and coated with a synthetic resin composition having lubricating properties, Here, a part of the net-like body is exposed smoothly and continuously with the surface of the coating layer over the entire surface of the bearing element, and the other side of the net-like body is covered with the coating layer over the entire surface of the bearing element. The process of preparing a bearing body, and pressing the prepared bearing body with a press die having one of a microprotrusion and a microrecess corresponding to the microprotrusion, and a press die having either one of a microprotrusion and a microrecess corresponding to the microprotrusion. and a punch having the other side, and a part of the mesh is deformed by the micro protrusions and micro recesses between the press die and the punch, and this deformation causes the coating layer to be formed on the other surface of the bearing element. This can also be achieved by a method of manufacturing an oil-free bearing, which includes the step of piercing the surface to expose a part of the net-like body.

[0013] In one of the manufacturing methods of the present invention, in the preparation step, a metal mesh is used as a base material, and the mesh and surface of this base material are filled and coated with a synthetic resin composition having lubricating properties. The method may include a step of preparing a bearing body by winding the formed flexible lubricating sheet into a cylindrical shape, and in this case, the bearing body is a cylindrical body. Furthermore, in one of the manufacturing methods of the present invention, the cylindrical body thus prepared is arranged between the above-mentioned press die and punch, and at the same time as the exposing step, one end of the cylindrical body is expanded by the press die and the punch. The method includes a step of forming a flanged bearing having a cylindrical portion by increasing the diameter and an enlarged-diameter flange integrally formed at one end of the cylindrical portion. Make sure to expose the parts.

[0014]

[Operation] In the oil-free bearing of the present invention constructed as described above, on one surface of the bearing, a part of the net-like body is exposed in smooth continuity with the surface of the coating layer, On the other side, a part of the net-like body partially breaks through the surface of the coating layer and is exposed, so that the bearing support placed on one side of the bearing, for example, the shaft and the other side, is exposed. As a result, the mechanisms are electrically contacted with the respective metal nets,
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 of an automobile door, the door and the rest of the automobile body can be suitably electrically connected by the bearing of the present invention.

The present invention will be explained below based on preferred embodiments shown in the drawings. This will make the invention and further inventions clear.

It should be noted that the present invention is not limited to these specific examples in any way.

[0017]

[Specific example] In FIGS. 1 and 2, the bearing 1 has a cylindrical portion 2
It is a bush bearing with a flange, which integrally has an enlarged diameter flange 4 at one end 3 of a cylindrical portion 2, and the cylindrical portion 2 and the enlarged diameter flange 4.
The base material is an expanded metal 5 which is a mesh made of copper alloy, and the mesh 6 and surface 7 of the expanded metal 5 are filled and coated with a tetrafluoroethylene resin composition 8 containing a wear resistance improver. It is formed by forming a coating layer 9 on the metal 5. Outer surface 10 and outer surface 10 of cylindrical portion 2
On one side surface 11 of the enlarged-diameter flange portion 4, a portion 12 of the expanded metal 5 is exposed in a smooth continuous manner with the surface 13 of the coating layer 9 over the entirety thereof. On the other hand, the expanded metal 5 is continuous to the inner surface 14 of the cylindrical part 2, which is covered with the coating layer 9 throughout, and the expanded metal 5 is covered with the coating layer 9 throughout, similar to the inner surface 14. On the other side surface 15 of the radial flange portion 4, a portion 16 of the expanded metal 5 partially pierces the surface of the coating layer 9 and is exposed. Further, as shown in FIG. 3, the bearing 1 of this example has an expanded metal 5 as a base material, and the mesh 6 and surface 7 of the expanded metal 5 are filled and coated with a polytetrafluoroethylene resin composition 8 having lubricating properties. The flexible lubricating sheet 17 thus formed is wound into a cylindrical shape,
It is a cylindrical bush bearing whose edges 18 and 19 are close to or in contact with each other.

The bearing 1 constructed as described above is used, for example, in an automobile door 20 and an automobile body 21 as shown in FIG.
When applied to the hinge mechanism 22 between the door 20 and the metal bearing support, the shaft 23 of the hinge mechanism 22 is inserted into the cylindrical part 2 of the bearing 1, and the enlarged diameter collar part 4 is connected to the door 20 in the hinge mechanism 22. and the mechanism 24.

In the bearing 1 of this example in which a portion 16 of the expanded metal 5 breaks through the surface of the coating layer 9 and is exposed is present in the expanded diameter flange 4, the automobile 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.
As a result of being electrically connected to each other via the part 16,
The automobile body 21 and the door 20 are also electrically connected via the expanded metal 5, so when the door 20 is incorporated into the automobile body 21 and electrostatic coating is applied to them at the same time (such coating is generally For painting the white body, the bearing 1 does not serve as an electrical insulator, and it is sufficient to wire a high-voltage power source to either the vehicle body 21 or the door 20. Further, since the part 16 of the expanded metal 5 is made of a metal having elastic-plasticity such as a copper alloy, even if an overload is applied to the part 16 during sliding, the part 16 made of the copper alloy Because it deforms elastically and plastically, it does not adversely affect the sliding friction resistance of the oil-free bearing.

The method for manufacturing the bearing 1 will be explained below.
A cylindrical body 30, which is the base body of the bearing 1 as shown in FIG. 5, is prepared. The cylindrical body 30 is preferably formed by winding the flexible lubricating sheet 17 into a cylindrical shape as described above with reference to FIG. The flexible lubricating sheet 17, in which a part 12 of the expanded metal 5 is exposed smoothly and continuously with the surface of the coating layer 9 on one side, is coated with an untreated material containing a wear resistance improver. Place the sintered tetrafluoroethylene resin composition in powder form on the surface of the expanded metal 5, roll it between two metal rolls, and then sinter the tetrafluoroethylene resin composition. can be manufactured by. Next, as shown in FIG.
A press die 33 and a press die 36 having a hole 34 fitted into the cylindrical portion 31 of the press die 33 and a micro protrusion 35 on the upper surface are prepared, and the previously prepared cylindrical body 30 is fitted into the hole 34 of the press die 36. . After this insertion, Figure 6
As shown in FIG.
One end 4 of the cylindrical portion 30 that fits into the hole 34 and protrudes from the hole 34
0 is expanded radially outward by the truncated conical portion 38 of the punch 39. After expansion, as shown in FIG. 7, the cylindrical portion 43 is provided with a cylindrical portion 41 and a cylindrical portion 43 that 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 protrusion 35 on the lower surface. Further prepare punch 44 to
A cylindrical body 30 having an enlarged diameter at one end 40 is disposed between the press die 4 and the press die 36. Then, while fitting the cylindrical part 41 of the punch 44 into the cylindrical body 30, the diameter of the previously enlarged end 40 is further enlarged by the cylindrical part 43, and then the cylindrical part 41 of the punch 44 is further fitted into the cylindrical body 30. Finally, as shown in FIGS. 8 and 9, the enlarged diameter flange 4 is formed and the punch 44 is
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, the diameter is expanded. The surface of the coating layer 9 is pierced at the side surface 15 of the collar portion 4 to expose a portion 16 of the expanded metal 5 to obtain the bearing 1.

Separate punches are prepared for forming the expanded diameter flange 4 and deformation of the expanded metal 5, and after forming the expanded diameter flange 4 with the punch for forming the expanded diameter flange, the expanded metal 5 is deformed. The work may be performed using another punch.

[0022]

[Effects of the Invention] 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. On the other side, a part of the mesh partially breaks through the surface of the coating layer and is exposed, ensuring a reliable electrical connection between the supported shaft and the support mechanism that supports the bearing. As a result, wiring work becomes easier during work such as electrostatic painting,
Work efficiency can be improved. In addition, since the bearing is made of a metal mesh as a base material and the mesh and surface of this base material are filled and coated with a synthetic resin composition having lubricating properties to form a coating layer on the base material, it has a long lifespan. The shaft can be supported with low sliding friction resistance over a long period of time.

[Brief explanation of the drawing]

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

FIG. 2 is a sectional view of the specific example shown in FIG. 1;

FIG. 3 is a partially cross-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 of manufacturing the oil-free bearing of the present invention.

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

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

FIG. 8 is an explanatory diagram of a preferred method of manufacturing the oil-free bearing of the present invention.

9 is an enlarged sectional view of part A shown in FIG. 8. FIG.

[Explanation of symbols]

1 Bearing 5 Expanded metal 9 Coating layer 12 Partial 16 Partial

Claims (4)

[Claims] Claim 1: A bearing comprising a metal mesh as a base material, and a coating layer formed on the base material by filling and coating the mesh and surface of the base material with a synthetic resin composition having lubricating properties. hand,
On one side of the bearing, a portion of the net is exposed in smooth continuity with the surface of the coating layer, and on the other side, a portion of the net is partially exposed on the surface of the coating layer. An oil-free bearing that breaks through the surface and is exposed. 2. A flange-equipped cylindrical bearing integrally having a cylindrical portion and an enlarged diameter flange at one end of the cylindrical portion, the cylindrical portion and the enlarged diameter flange having a metal net-like body. The mesh and surface of this base material are filled and coated with a synthetic resin composition having lubricating properties to form a coating layer on the base material, and a part of the network penetrates the surface of the coating layer. The oil-free bearing according to claim 1, wherein the exposed portion is an enlarged diameter flange. [Claim 3] The bearing has a metal net-like body as a base material,
3. The cylindrical bush bearing according to claim 1 or 2, which is a cylindrical bush bearing formed by winding a flexible lubricating sheet formed by filling and coating the mesh and surface of the base material with a synthetic resin composition having lubricating properties. The oil-free bearings listed. 4. A metal net-like body is used as a base material, and the mesh and surface of this base material are filled and coated with a synthetic resin composition having lubricating properties. Preparing a bearing body in which a part of the body is exposed smoothly and continuously with the surface of the coating layer, and a net-like body is entirely covered with the coating layer on the other surface; The bearing body is pressed between a press die having one of a microprotrusion and a microrecess corresponding to the microprotrusion, and a punch having one of the microprotrusion and a microrecess corresponding to the microprotrusion. A part of the net is deformed by the micro protrusions and micro recesses of the press die and punch, and this deformation pierces the surface of the coating layer on the other side of the bearing element, causing one part of the net to be deformed. A method for manufacturing an oil-free bearing, comprising a step of exposing a portion of the bearing.