JP2019132387A - bearing - Google Patents

Abstract

To provide a bearing which can prevent the fracture of a lubrication film of a lubrication part, reduce friction between the lubrication film and a slide face and smoothly slide even if a large load is applied thereto.SOLUTION: A bearing comprises two slide faces having regions which are approximate to each other via a lubrication film 3 for forming a flow passage of a lubricant, and the first region 6 in which a plurality of water repellent parts or the like 4 having functions for holding air bubbles 8, and hydrophilic parts or the like 5 having no functions for holding air bubbles surrounding the water repellent parts are alternately arranged, and the second region 7 in which the hydrophilic parts or the like 5 is arranged are formed on a first slide face 1, which is approximate to the second slide face 2. A load applied to the bearing is supported by pressure of the lubrication film between the first slide face 1 and the second slide face 2 which is induced by a shearing flow rate difference with the second region 7 which is generated by reduction in a shearing flow rate accompanied by the reduction in a volume of a flow passage caused by the air bubbles 8 which are protruded into the lubrication film 3 accompanied by a slide of a slide part, and lowering of friction between the second slide face 2 and the lubrication film 3 is induced by the air bubbles 8 which are protruded into the lubrication film 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bearing, and more particularly to a bearing that uses bubbles held on a sliding surface in a sliding portion.

  Bearings are used as structures having sliding portions in various information devices such as CDs and DVDs that support light loads. In many cases, the sliding portion of such a structure is provided with a lubricating portion in which both lubrication surfaces (hereinafter sometimes referred to as “sliding surfaces”) are close to each other to maintain the lubricity and lubricity. Therefore, a lubricating film made of lubricating oil or grease is formed.

However, such a configuration has the following problems.
(I) In information equipment, smooth sliding of a bearing in a state where a larger load is applied may be required.
(Ii) The film thickness of the lubricating film varies depending on the moving speed and acceleration of the sliding surface in the sliding portion or the condition of the lubricating surface. In particular, in an extremely low speed state such as at the time of starting (at the time of sliding start), the oil film becomes thin, so that the possibility of direct contact between the lubricated surfaces increases as the load increases.
(Iii) As a method of improving the lubrication state under such severe conditions and avoiding damage to the sliding surface, a low friction reaction film or a hard carbon film (DLC) by changing the material of the current sliding part or using various additives The formation of coating films such as these is the mainstream, and there have been few studies that have examined fundamental improvements to lubricating films.

  The present invention has been made in view of the above circumstances, and its purpose is to prevent breakage of the lubricating film in the lubrication part without applying a complicated structure or special material or processing, and a state in which a large load is applied. However, it is to provide a bearing capable of smooth sliding by reducing friction on the lubricating film and the sliding surface.

  As a result of intensive studies, the present inventors have found that the above object can be achieved by the following bearings, and have completed the present invention.

The present invention is a bearing having a sliding portion provided with two sliding surfaces having regions close to each other through a lubricating film that forms a flow path of the lubricant,
A plurality of water-repellent parts or oil-repellent parts having a function of holding bubbles and a hydrophilic part or an oleophilic part having no function of holding bubbles surrounding them are alternately arranged on one first sliding surface of the sliding surface. A first region disposed on the second region and a second region disposed on the hydrophilic portion or the lipophilic portion are disposed adjacent to the other second sliding surface;
As the sliding portion slides, a first induced by a shear flow rate difference with a second region generated by a decrease in shear flow rate due to a decrease in volume of the flow path due to the bubbles protruding into the lubricating film. The load applied to the bearing is supported by the pressure of the lubricating film between the sliding surface and the second sliding surface, and the friction between the second sliding surface and the lubricating film is reduced by the bubbles protruding into the lubricating film. Is induced.
Based on the knowledge to be described later obtained in the process of verifying the improvement of the sliding function of the bearing, the present invention is provided with a plurality of water-repellent parts or oil-repellent parts having a function of holding relatively large bubbles. A first sliding surface having a first region and induced by a difference in shear flow rate from the second region generated by a decrease in shear flow rate due to a decrease in the volume of the lubricant flow path due to bubbles protruding into the lubricant film In addition, the load applied to the bearing is supported by the pressure of the gap between the second sliding surfaces, and the friction between the second sliding surface and the lubricating film is induced by bubbles protruding into the lubricating film. This prevents the lubrication film from being broken in the lubrication part without complicated structures and special materials and processing, and reduces friction on the lubrication film and sliding surface even under heavy loads. Provide slidable bearings It could be.

Further, the present invention is a bearing having a sliding portion provided with two sliding surfaces having regions close to each other through a lubricating film forming a lubricant flow path,
A plurality of water-repellent parts or oil-repellent parts having a function of holding bubbles and a hydrophilic part or an oleophilic part having no function of holding bubbles surrounding them are alternately arranged on one first sliding surface of the sliding surface. A first region disposed on the second region and a second region disposed on the hydrophilic portion or the lipophilic portion are disposed adjacent to the other second sliding surface;
The bubble is held in the first sliding surface without protruding into the lubricating film, and a second region generated by an increase in shear flow rate due to slip flow in the lubricating film in contact with the bubble as the sliding portion slides The load applied to the bearing is supported by the pressure of the lubricating film between the first sliding surface and the second sliding surface induced by the difference in the shear flow rate between the first sliding surface and the friction with the lubricating film by the bubbles contacting the lubricating film. It is characterized by inducing a decrease in.
As described above, based on the knowledge obtained in the process of verifying the improvement of the sliding function of the bearing, the present invention is provided with a plurality of water-repellent parts or oil-repellent parts having a function of holding relatively small bubbles. A gap between the first sliding surface and the second sliding surface induced by a difference in shear flow rate from the second region generated by an increase in shear flow rate due to slip flow in the lubricating film in contact with the bubbles. The load applied to the bearing is supported by the pressure, and the structure in which the friction with the lubricating film is induced by the bubbles in contact with the lubricating film. Even in a state where a load of 2 mm is applied, it was possible to provide a bearing that can reduce friction in the lubricating film and can smoothly slide.

Further, the present invention provides the bearing according to any one of the above, wherein the water-repellent portion or the oil-repellent portion is formed in a recess that is 1 to several tens of micrometers lower than the lubricating film, and the inner surface thereof is water-repellent or oil-repellent. By adjusting the surface roughness, the water repellency or oil repellency and the function of holding bubbles are adjusted, and the amount or size of the bubbles held in the water or oil repellent part is adjusted. It is characterized by that.
In the verification process as described above, the inventor further adjusts the size of the bubbles held in the water-repellent part or the oil-repellent part, and induces a difference in the shear flow rate in the lubricating film and makes contact with the bubbles. The structure capable of adjusting the friction lowering function is that the water-repellent part or the oil-repellent part has a recessed portion that is lower than the lubricating film by a predetermined range, and its inner surface has water repellency or oil repellency, The knowledge that it was realizable by adjusting surface roughness was acquired. Specifically, formation of a dent portion of 1 to several tens of μm, oil repellency or water repellency to the dent portion, and / or surface roughness to the dent portion can be firmly held even in a sliding state. The above-described functions can be realized while maintaining the air bubbles.

Explanatory drawing illustrating the configuration of the bearing sliding portion according to the present invention. Explanatory drawing which illustrates other composition about the bearing sliding part concerning the present invention

<Basic configuration of bearing according to the present invention>
A bearing according to the present invention (hereinafter referred to as a “main bearing”) is a bearing having a sliding portion provided with two sliding surfaces having regions close to each other through a lubricating film forming a lubricant flow path. ,
A plurality of water-repellent parts or oil-repellent parts (hereinafter sometimes referred to as “water-repellent parts”) having a function of holding bubbles and bubbles surrounding the first sliding surface of the sliding surface A first region in which hydrophilic portions or lipophilic portions (hereinafter sometimes referred to as “hydrophilic portions”) that do not have a holding function are alternately arranged, and a second region in which hydrophilic portions are arranged is arranged. In proximity to the other second sliding surface,
A first sliding surface induced by a shear flow rate difference with a second region generated by a decrease in the shear flow rate due to a decrease in the volume of the flow path due to bubbles protruding into the lubricating film as the sliding portion slides; The load applied to the bearing is supported by the pressure of the lubricating film between the second sliding surfaces, and a decrease in friction between the second sliding surface and the lubricating film is induced by the bubbles protruding into the lubricating film. Features. The basic configuration and functions of the present invention will be described below with reference to the drawings.

  1A to 1D illustrate a configuration (first configuration example) of a bearing sliding portion according to the present invention. The present bearing includes two sliding surfaces (first sliding surface 1 and second sliding surface 2) that are close to each other via a lubricating film 3 that forms a flow path for the lubricant. On the first sliding surface 1, a plurality of water-repellent portions (41, 42, 43..., Hereinafter abbreviated as “water-repellent portions 4”) and hydrophilic portions 5 surrounding them are alternately arranged. In addition, a first region 6 and a second region 7 in which a hydrophilic portion or the like is disposed are disposed. The second sliding surface 2 is composed of a hydrophilic portion 5 and the like. The water repellent part 4 is processed and processed so as to hold the bubbles strongly, and the hydrophilic part 5 does not have a function of holding the bubbles. FIG. 1A illustrates a cross section of the bearing sliding portion. FIG. 1B illustrates the first sliding surface 1 in the a-a ′ cross section of FIG. FIG. 1C illustrates the pressure (details will be described later) generated in the lubricating film 3 when the bearing sliding portion slides. FIG. 1D illustrates the bubbles 8 held in the water repellent part 4 or the like.

  Specifically, in the first configuration example, the following functions can be obtained by the bubbles 8 held in the water repellent part 4 as the main bearing sliding part slides.

(I) State of the bubble 8 during operation of the sliding portion Sliding of the sliding portion (in FIG. 1, the case where the second sliding surface 2 moves is illustrated, but the first sliding surface 1 and the second sliding surface As long as the relative movement of the sliding surface 2 is formed, the movement of the second sliding surface 2 or the movement of both of them does not matter, and as shown in FIG. To move. At this time, as shown in FIG. 1D, the bubbles 8 held in the water-repellent part 4 and the like maintain the state of protruding into the lubricating film 3, while the lubricating film 3 and the second sliding surface 2 Maintain contact.

(Ii) Function of the bubbles 8 in the first region 6 At this time, in the vicinity of the water repellent part 4 where the bubbles 8 are held, the flow path of the lubricant is narrowed by the presence of the bubbles 8 protruding into the lubricating film 3. Accordingly, as shown in FIG. 1B, the shear flow rate in the lubricating film 3 decreases in the first region 6 in which the plurality of water repellent portions 4 are disposed. On the other hand, in the second region 7 in which the hydrophilic portion 5 or the like is disposed, the lubricant moves without a decrease in the shear flow rate. In the lubricating film 3 between the first sliding surface 1 and the second sliding surface 2 where such a difference in shear flow rate has occurred, a second as shown in FIG. A pressure is induced in the vicinity of flowing from the region 7 into the first region 6. That is, the sliding portion of the bearing can have a function of supporting the load by the pressure induced by the difference in shear flow rate. Accordingly, even when a large load is applied, this can be supported and smoothly slid. The coefficient of friction with other substances on the surface of the bubble 8 is very small. As shown in FIG. 1D, the lubricant film in the sliding state of the bearing is caused by the bubbles 8 protruding into the lubricant film 3. 3, and a frictional reduction is induced on the contact surface with 3 and the contact surface with the second sliding surface 2, and smooth sliding is possible.

  Here, as shown in FIG. 1A, the water-repellent part 4 or the like 4 in which the bubbles 8 are held is formed in a concave portion 1 to several tens μm lower than the lubricating film 3 on the first sliding surface 1. A configuration in which the inner surface is treated so as to have water repellency or oil repellency (a treatment method and the like will be described later) is preferable. By forming the recess, the held bubbles 8 can be firmly held in the water repellent part 4 even in the sliding state. In the first configuration example, the depth of the recess is adjusted so that the bubbles 8 protrude into the lubricating film 3. Moreover, the knowledge that the water repellency or oil repellency and the function of retaining bubbles can be adjusted by adjusting the surface roughness of the inner surface of the recess was obtained. That is, by adjusting the depth of the recess and the surface roughness of the inner surface corresponding to the film thickness and composition of the lubricating film 3 or the sliding conditions (sliding speed, sliding time, etc.) The amount or size of the bubbles 8 held by 4 and the holding strength can be adjusted. Further, the bubbles 8 can be formed in the water repellent part 4 by using a contrast agent or the like.

  Further, as shown in FIG. 1B, the first region 6 is constituted by a plurality of water repellent portions 4 and the like and hydrophilic portions 5 surrounding the water repellent portions 4 and the like. As described above, one water-repellent part 4 or the like is induced by the difference in shear flow rate from the generated second region due to the decrease in the shear flow rate due to the reduction in the volume of the flow path due to the bubbles 8 protruding into the lubricating film 3. The load applied to the bearing is supported by the pressure of the lubricating film 3 between the first sliding surface 1 and the second sliding surface 2. At this time, the plurality of water-repellent parts (41, 42, 43...) Are not limited to the vertical and horizontal two-dimensional array illustrated in FIG. Etc. can be arbitrarily set. In addition, the region widths of the first region 6 and the second region 7 are set so as to always exist between the first sliding surface 1 and the second sliding surface 2 that are close to each other when sliding.

Here, the surface treatment in the water repellent part 4 and the hydrophilic part 5 will be described.
(1) The case where the surface of each part has a substance having lipophilicity or hydrophilicity or oil repellency or water repellency, or when a treatment film having such properties is formed. For example, examples of the lipophilic or hydrophilic substance include brass and steel, and examples of the oil or water repellency substance include fluororesin, graphite, diamond, and bright lead mineral. Moreover, the case where the coating film by which these were apply | coated (coating) is formed is mentioned.
(2) A case where the surface of each region is subjected to chemical lipophilic treatment or hydrophilic treatment, or oil repellency treatment or water repellency treatment. For example, chemical treatment such as acid treatment, carbonization treatment or nitriding treatment of the metal surface can be mentioned.
(3) The case of having surface porosity or the case of imparting oil repellency or water repellency to the dents may be mentioned. For example, the case where the surface is produced by combining sintered metals or ceramics having different characteristics can be mentioned.
(4) Or the case where it formed so that it might have different lipophilicity or hydrophilicity or oil repellency or water repellency by some combination of said (1)-(3).

<Other configuration of bearing according to the present invention>
In the other configuration (second configuration example) of this bearing, like the first configuration example, a plurality of water-repellent portions and hydrophilic portions surrounding it are alternately arranged on one of the first sliding surfaces. A first region disposed in the second region and a second region in which a hydrophilic portion or the like is disposed are disposed so as to be close to the other second sliding surface. However, the bubbles are held in the first sliding surface without protruding into the lubricating film, and the second region generated by the increase in the shear flow rate due to the slip flow in the lubricating film in contact with the bubbles as the sliding part slides; The load applied to the bearing is supported by the pressure of the lubricating film between the first sliding surface and the second sliding surface induced by the difference in the shear flow rate, and the air bubbles contacting the lubricating film cause the friction with the lubricating film. This is different from the first configuration example in that a decrease is induced.

  2A to 2D illustrate a sliding portion according to a second configuration example. The present bearing includes two sliding surfaces (first sliding surface 1 and second sliding surface 2) that are close to each other via a lubricating film 3 that forms a flow path for the lubricant. On the first sliding surface 1, a plurality of water-repellent portions (41a, 42a, 43a..., Hereinafter abbreviated as “water-repellent portions 4a”) and hydrophilic portions 5 surrounding them are alternately arranged. In addition, a first region 6a and a second region 7 in which a hydrophilic portion or the like is disposed are disposed. The second sliding surface 2 is composed of a hydrophilic portion 5 and the like. The water repellent part 4a is processed and processed so as to hold the bubbles strongly, and the hydrophilic part 5 does not have a function of holding the bubbles. FIG. 2A illustrates a cross section of the bearing sliding portion. FIG. 2B illustrates the first sliding surface 1 in the b-b ′ cross section. FIG. 2C illustrates the pressure (details will be described later) generated in the lubricating film 3 when the bearing sliding portion slides.

  Specifically, in the second configuration example, the following functions can be obtained by the bubbles 8 held in the water repellent part 4a as the bearing sliding part slides.

(I) State of bubbles 8a during operation of the sliding portion As the sliding portion slides, the lubricant moves in the lubricating film 3 as shown in FIG. At this time, the bubbles 8 a held in the water repellent part 4 a and the like maintain the state of being in contact with the lubricating film 3 while maintaining the state of being held without protruding to the lubricating film 3.

(Ii) Function of the bubbles 8a in the first region 6 At this time, in the water repellent part 4a where the bubbles 8a are held, a slip flow occurs in the lubricating film 3 in contact with the bubbles 8a due to the presence of the bubbles 8a. Therefore, as shown in FIG. 2B, in the first region 6a where the plurality of water repellent parts 4a are disposed, an increase in shear flow rate due to slip flow in the lubricating film 3 occurs. On the other hand, in the second region 7 in which the hydrophilic portion 5 is disposed, the lubricant moves without increasing the shear flow rate. In the lubricating film 3 between the first sliding surface 1 and the second sliding surface 2 where such a difference in shear flow rate has occurred, the first as shown in FIG. Pressure is induced in the vicinity of flowing from the region 6 to the second region 7. That is, the sliding portion of the bearing can have a function of supporting the load by the pressure induced by the difference in shear flow rate. Accordingly, even when a large load is applied, this can be supported and smoothly slid. In addition, the coefficient of friction with other substances on the surface of the bubble 8a is very small, and a decrease in friction at the contact surface with the lubricating film 3 in the sliding state of the bearing is induced, so that smooth sliding is possible.

  Here, as shown in FIG. 2A, the water-repellent part 4a in which the bubbles 8a are held is 1 to several tens μm lower than the lubricating film 3 on the first sliding surface 1 as in the first configuration example. A structure in which the inner surface is formed to have a water repellency or oil repellency is preferable. By forming the recess, the held bubbles 8a are firmly held by the water repellent part 4a even in the sliding state. In the second configuration example, the depth of the recess is adjusted so that the bubbles 8 a do not protrude into the lubricating film 3. Further, by adjusting the surface roughness of the inner surface of the recess, the water repellency or oil repellency and the function of retaining bubbles can be adjusted. That is, by adjusting the depth of the recess and the surface roughness of the inner surface corresponding to the film thickness and composition of the lubricating film 3 or the sliding conditions (sliding speed, sliding time, etc.) The amount or size of the bubbles 8a held by 4a and the holding strength can be adjusted. The bubbles 8a can be formed in the water repellent part 4a by using a contrast agent or the like.

  Further, as shown in FIG. 2B, the first region 6a is constituted by a plurality of water repellent portions 4a and a plurality of hydrophilic portions 5 surrounding the water repellent portions 4a. As described above, the presence of the bubbles 8a held in contact with the lubricating film 3 in one water repellent portion 4a causes a slip flow in the lubricating film 3 in contact with the bubbles 8a, and a plurality of water repellent portions, etc. In the entire first region 6 where 4a is disposed, an increase in shear flow rate due to slip flow in the lubricating film 3 occurs. As a result, the first region 6 to the second region between the first sliding surface 1 and the second sliding surface 2 induced by the shear flow rate difference with the second region 7 where no increase in the shear flow rate occurs. The load applied to the bearing is supported by the pressure of the lubricating film 3 in the vicinity of flowing into the bearing 7. At this time, the arrangement of the plurality of water-repellent parts (41, 42, 43...) Or the surface treatment in the water-repellent part 4a and the hydrophilic part 5 are the same as in the first configuration example.

DESCRIPTION OF SYMBOLS 1 1st sliding surface 2 2nd sliding surface 3 Lubricating film 4 Water repellent part etc. 5 Hydrophilic part etc. 6 1st area | region 7 2nd area | region 8 Bubble

The present invention is a bearing having a sliding portion provided with two sliding surfaces having regions close to each other through a lubricating film that forms a flow path of the lubricant,
One of the sliding surfaces has a water-repellent or oil-repellent inner surface with a concave portion having a function of retaining bubbles and a hydrophilic or lipophilic property having no function of retaining bubbles surrounding the first surface. A first region in which a plurality of regions having an alternating shape and a second region in which the hydrophilic or lipophilic region is disposed are disposed in proximity to the other second sliding surface;
The bubbles are formed in the recesses having the water repellency or oil repellency using a contrast agent, the depth and surface roughness of the recesses are adjusted, and the function of holding the water repellency or oil repellency and bubbles is adjusted. By adjusting the amount or size of the bubbles held in the cylinder and the holding strength, the lubricating film and the second film are maintained while maintaining the state in which the bubbles protrude into the lubricating film even when the sliding portion slides. While maintaining contact with the sliding surface,
Along with the sliding of the sliding portion, a first flow generated by a decrease in the flow rate of shear flow (hereinafter also referred to as “shear flow rate”) due to a decrease in volume of the flow path due to the bubbles protruding into the lubricating film. The load applied to the bearing is supported by the pressure of the lubricating film between the first sliding surface and the second sliding surface induced by the difference in the flow rate of the shear flow between the two regions and protrudes into the lubricating film. The air bubbles induce a decrease in friction between the second sliding surface and the lubricating film.
Based on the knowledge to be described later obtained in the process of verifying the improvement of the sliding function of the bearing, the present invention is provided with a plurality of water-repellent parts or oil-repellent parts having a function of holding relatively large bubbles. A first sliding surface having a first region and induced by a difference in shear flow rate from the second region generated by a decrease in shear flow rate due to a decrease in the volume of the lubricant flow path due to bubbles protruding into the lubricant film In addition, the load applied to the bearing is supported by the pressure of the gap between the second sliding surfaces, and the friction between the second sliding surface and the lubricating film is induced by bubbles protruding into the lubricating film. This prevents the lubrication film from being broken in the lubrication part without complicated structures and special materials and processing, and reduces friction on the lubrication film and sliding surface even under heavy loads. Provide slidable bearings It could be. Bubbles can be formed in the water-repellent part 4 by using a contrast agent or the like.

Further, the present invention is a bearing having a sliding portion provided with two sliding surfaces having regions close to each other through a lubricating film forming a lubricant flow path,
One of the sliding surfaces has a water-repellent or oil-repellent inner surface with a concave portion having a function of retaining bubbles and a hydrophilic or lipophilic property having no function of retaining bubbles surrounding the first surface. A first region in which a plurality of regions having an alternating shape and a second region in which the hydrophilic or lipophilic region is disposed are disposed in proximity to the other second sliding surface;
The bubbles are formed in the recesses having the water repellency or oil repellency using a contrast agent, the depth and surface roughness of the recesses are adjusted, and the function of holding the water repellency or oil repellency and bubbles is adjusted. By adjusting the amount or size of the bubbles held in and the holding strength, the bubbles are held in the first sliding surface without protruding into the lubricating film even when the sliding portion slides While maintaining the state in contact with the lubricating film while maintaining
A first sliding surface induced by a difference in the flow rate of the shear flow from the second region generated by an increase in the flow rate of the shear flow due to the slip flow in the lubricating film in contact with the bubbles as the sliding portion slides; A load applied to the bearing is supported by the pressure of the lubricating film between the second sliding surfaces, and a reduction in friction with the lubricating film is induced by bubbles contacting the lubricating film.
As described above, based on the knowledge obtained in the process of verifying the improvement of the sliding function of the bearing, the present invention is provided with a plurality of water-repellent parts or oil-repellent parts having a function of holding relatively small bubbles. A gap between the first sliding surface and the second sliding surface induced by a difference in shear flow rate from the second region generated by an increase in shear flow rate due to slip flow in the lubricating film in contact with the bubbles. The load applied to the bearing is supported by the pressure, and the structure in which the friction with the lubricating film is induced by the bubbles in contact with the lubricating film. Even in a state where a load of 2 mm is applied, it was possible to provide a bearing that can reduce friction in the lubricating film and can smoothly slide. Bubbles can be formed in the water-repellent part 4 by using a contrast agent or the like.

<Basic configuration of bearing according to the present invention>
A bearing according to the present invention (hereinafter referred to as a “main bearing”) is a bearing having a sliding portion provided with two sliding surfaces having regions close to each other through a lubricating film forming a lubricant flow path. ,
On one first sliding surface of the sliding surface, a concave portion (hereinafter sometimes referred to as a “water repellent portion”) having a water repellent or oil repellent function and a function of retaining bubbles is provided. Regions having hydrophilicity or lipophilicity alternately having hydrophilic or lipophilic regions (hereinafter sometimes referred to as "hydrophilic portions") that do not have a function of retaining surrounding bubbles, and regions having hydrophilicity or lipophilicity A second region in which ( hydrophilic portion or the like ) is disposed, and close to the other second sliding surface;
Air bubbles are formed in concave portions (water repellent portions, etc.) having water repellency or oil repellency using a contrast agent, and the depth and surface roughness of the concave portions are adjusted to adjust the function of retaining the water repellency or oil repellency and bubbles. By adjusting the amount or size of the bubbles held in the recesses and the holding strength, the lubricant film and the second film are maintained while maintaining the state in which the bubbles protrude into the lubricant film even when the sliding part slides. While maintaining contact with the sliding surface,
A first sliding surface induced by a shear flow rate difference with a second region generated by a decrease in the shear flow rate due to a decrease in the volume of the flow path due to bubbles protruding into the lubricating film as the sliding portion slides; The load applied to the bearing is supported by the pressure of the lubricating film between the second sliding surfaces, and a decrease in friction between the second sliding surface and the lubricating film is induced by the bubbles protruding into the lubricating film. Features. The basic configuration and functions of the present invention will be described below with reference to the drawings.

<Other configuration of bearing according to the present invention>
In the other configuration (second configuration example) of this bearing, like the first configuration example, a plurality of water-repellent portions and hydrophilic portions surrounding it are alternately arranged on one of the first sliding surfaces. A first region disposed in the second region and a second region in which a hydrophilic portion or the like is disposed are disposed so as to be close to the other second sliding surface. However, even when the sliding portion slides, the air bubbles are not protruded from the lubricating film and are maintained in the first sliding surface while being kept in contact with the lubricating film, and the sliding portion The lubricating film between the first sliding surface and the second sliding surface induced by the shear flow rate difference with the second region generated by the increase in the shear flow rate due to the slip flow in the lubricating film in contact with the bubbles This is different from the first configuration example in that the load applied to the bearing is supported by the pressure of and the friction with the lubricating film is induced by bubbles contacting the lubricating film.

Claims (3)

A bearing having a sliding portion with two sliding surfaces having regions close to each other through a lubricating film forming a lubricant flow path,
A plurality of water-repellent parts or oil-repellent parts having a function of holding bubbles and a hydrophilic part or an oleophilic part having no function of holding bubbles surrounding them are alternately arranged on one first sliding surface of the sliding surface. A first region disposed on the second region and a second region disposed on the hydrophilic portion or the lipophilic portion are disposed adjacent to the other second sliding surface;
As the sliding portion slides, a first induced by a shear flow rate difference with a second region generated by a decrease in shear flow rate due to a decrease in volume of the flow path due to the bubbles protruding into the lubricating film. The load applied to the bearing is supported by the pressure of the lubricating film between the sliding surface and the second sliding surface, and the friction between the second sliding surface and the lubricating film is reduced by the bubbles protruding into the lubricating film. A bearing characterized by being induced. A bearing having a sliding portion with two sliding surfaces having regions close to each other through a lubricating film forming a lubricant flow path,
A plurality of water-repellent parts or oil-repellent parts having a function of holding bubbles and a hydrophilic part or an oleophilic part having no function of holding bubbles surrounding them are alternately arranged on one first sliding surface of the sliding surface. A first region disposed on the second region and a second region disposed on the hydrophilic portion or the lipophilic portion are disposed adjacent to the other second sliding surface;
The bubble is held in the first sliding surface without protruding into the lubricating film, and a second region generated by an increase in shear flow rate due to slip flow in the lubricating film in contact with the bubble as the sliding portion slides The load applied to the bearing is supported by the pressure of the lubricating film between the first sliding surface and the second sliding surface induced by the difference in the shear flow rate between the first sliding surface and the friction with the lubricating film by the bubbles contacting the lubricating film. Bearing is characterized in that a decrease in the resistance is induced.   The water-repellent part or the oil-repellent part is formed in a recess that is 1 to several tens of micrometers lower than the lubricating film, and the inner surface has water repellency or oil repellency, and the surface roughness is adjusted to adjust the surface roughness. 3. The high slipperiness according to claim 1 or 2, wherein the water repellency or oil repellency and the function of holding bubbles are adjusted, and the amount or size of the bubbles held in the water or oil repellent part is adjusted. bearing.

Images