JP6155709B2 - Sliding member, bearing member, seal member, and apparatus - Google Patents

Description

  The present invention relates to a sliding member lubricated with a lubricating liquid, and a bearing member, a seal member, and an apparatus using the sliding member.

  Among the sliding members to which the lubricating liquid is supplied, for example, a thrust bearing has been developed in which a groove through which the lubricating liquid flows is formed on the sliding surface (sliding surface) of the thrust bearing that receives the thrust load of the rotating shaft. Yes. Further, a technology for improving the dynamic pressure effect by forming irregularities on the sliding surface in a thrust bearing is disclosed (for example, Patent Document 1).

  As a sliding member such as a bearing to which a lubricating liquid is supplied, an alloy such as white metal (Babbit metal), ceramics (for example, Patent Document 1), carbon (for example, Patent Document 2), phenol resin (for example, Patent Document) An example composed of 3) is shown.

Japanese Patent Laid-Open No. 11-351242 Japanese Patent No. 3963994 JP 2001-124070 A

  However, when the sliding member is made of an alloy, ceramics, or carbon, since the affinity with the lubricating liquid is relatively low, the friction coefficient increases in the boundary lubrication region or the mixed lubricating oil region in the Stribeck curve. Then, in the sliding member such as the bearing having grooves and irregularities formed on the sliding surface, the sliding surface is worn away, the grooves and irregularities are worn down, or wear powder accumulates in the grooves and concave portions. There is a risk that the flow rate of the lubricating liquid may decrease or the dynamic pressure effect may not be obtained.

  Ceramics and carbon also have a problem of high manufacturing costs because they require advanced techniques for processing.

  Therefore, since it is easy to process, it may be possible to construct the sliding member with a resin that can be manufactured at low cost. However, a general resin that does not have a hydroxyl group has a relatively high affinity with the lubricating liquid. Low. The phenolic resin having a hydroxyl group has a relatively high affinity with the lubricating liquid when water is used as the lubricating liquid, but the unpolymerized one swells when exposed to water, and the sliding member is deformed. There is a risk.

  Therefore, there is a demand for the development of a sliding member that can be manufactured at a low cost and has high affinity with a lubricating liquid and improved wear resistance.

  Therefore, in view of such a problem, the present invention configures a sliding member with a resin, and devise a substance disposed on the sliding surface of the sliding member, so that the affinity between the sliding member and the lubricating liquid is increased. It is an object of the present invention to provide a sliding member, a bearing member, a seal member, and an apparatus that can increase the wear resistance and can improve wear resistance.

In order to solve the above problems, the sliding member of the present invention is a sliding member to which water is supplied as a lubricating liquid , and includes a resin-made main body, and oxygen is applied to the sliding surface of the main body. It is characterized in that a functional group is provided.

  Further, the main body portion may include a carbon material in addition to the resin.

  The resin may be polyphenylene sulfide.

  In order to solve the above problems, a bearing member of the present invention includes the above sliding member.

  In order to solve the above problems, a sealing member of the present invention includes the sliding member.

In order to solve the above problems, an apparatus according to the present invention includes the sliding member.
In order to solve the above problems, an apparatus of the present invention is an apparatus capable of supplying water as a lubricating liquid, and the apparatus includes a sliding member to which a lubricating liquid is supplied, and the sliding member is made of resin. A layer including a main body, extending in contact with the resin main body, and having a functional group containing oxygen is formed as a sliding surface.

  According to the present invention, it is possible to increase the affinity between the sliding member and the lubricating liquid by configuring the sliding member with resin and devising a material disposed on the sliding surface of the sliding member. It becomes possible to improve wear resistance.

It is a figure for demonstrating the sliding member concerning this embodiment. It is a figure which shows the XPS result of an Example and a comparative example. It is a figure which shows the XPS result of an Example and a comparative example. It is a figure which shows the XPS result of an Example and a comparative example. It is a figure for demonstrating a contact angle. It is a figure for demonstrating the result of an underwater pin on disk test.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a view for explaining a sliding member 100 according to the present embodiment. As shown in FIG. 1, the sliding member 100 according to the present embodiment slides relative to the mating member 150 in the direction indicated by the white arrow in FIG. 1, for example. A liquid lubricating liquid 200 is supplied to the sliding surface of the sliding member 100 with the mating member 150, and the lubricating liquid 200 reduces frictional force and wear on the sliding surface of the sliding member 100. As shown in FIG. 1, the sliding member 100 includes a resin main body 110, and a functional group 120 containing oxygen is imparted to the sliding surface of the main body 110.

The functional group containing oxygen (hereinafter, simply referred to as “functional group”) 120 includes, for example, C—O, C═O (carbonyl group), O—C═O (carboxyl group), SO ₃ H (sulfo group). In comparison with the resin, the affinity with the lubricating liquid 200 is relatively high. For example, when the lubricating liquid 200 is water, the functional group 120 has a relatively high hydrophilicity compared to the resin. Therefore, by disposing the functional group 120 on the sliding surface of the main body 110, it is possible to increase the affinity of the sliding surface with the lubricating liquid 200 and to reduce the friction of the sliding surface. . Thereby, the abrasion resistance of the sliding member 100 can be improved.

  The resin constituting the main body 110 includes polyphenylene sulfide (hereinafter referred to as “PPS”), polyamide resins such as nylon, fluorine resins such as polyether ether ketone and polytetrafluoroethylene, polyethylene terephthalate, polybutylene terephthalate, One or more selected from the group consisting of polycarbonate, polymethacrylonitrile, polymethyl methacrylate, polyethyl methacrylate, polyethylene, polypropylene, polystyrene, and polyvinyl chloride, preferably polyamide resins such as PPS and nylon, polyether One or more selected from the group of fluorine resins such as ether ketone and polytetrafluoroethylene, more preferably PPS.

  Polyamide resins such as PPS and nylon, and fluorine resins such as polyetheretherketone and polytetrafluoroethylene have high self-lubricating properties and high wear resistance and high mechanical strength. By configuring, the lubricity, wear resistance, and mechanical strength of the main body 110 can be improved.

  Since PPS has substantially the same strength as white metal that is generally used as a bearing material, the durability of the sliding member 100 can be increased by forming the main body 110 (sliding member 100) from PPS. It becomes possible to maintain sex. Further, even when PPS uses water as the lubricating liquid 200, the swelling rate is lower than that of the phenol resin. Therefore, by forming the sliding member 100 with PPS, it is possible to avoid a situation in which the sliding member 100 is swollen and deformed by the lubricating liquid 200.

Furthermore, the main body 110 of the sliding member 100 may include a carbon material (for example, carbon fiber) or glass (SiO ₂ ) fiber in addition to the resin. By configuring the main body 110 with a resin containing a fibrous substance such as carbon fiber or glass fiber, the strength of the sliding member 100 can be improved, and the durability of the sliding member 100 can be further improved. It becomes.

Moreover, since carbon and silicon (Si) are easy to form the functional group 120, the main body 110 is made of sliding by forming the main body 110 with a resin containing a carbon material or a silicon material (for example, SiO ₂ ). It is possible to improve the efficiency of applying the functional group 120 to the surface.

  The functional group 120 is imparted to the sliding surface of the main body 110 using vacuum plasma such as ECR (Electron Cyclotron Resonance) plasma (for example, described in JP 2012-102205 A) or atmospheric pressure plasma. can do. When the functional group 120 is imparted to the resin using such plasma, the plasma is generated with one or more gases selected from the group consisting of argon, helium, neon, krypton, and xenon, and the functional group 120 is imparted. One or more gases selected from the group consisting of oxygen, nitrogen, and carbon dioxide may be used as the gas.

  In addition, when manufacturing the sliding member 100 which is cylindrical slide members 100, such as a journal bearing, and a sliding surface is distribute | arranged to an internal peripheral surface, it is good to utilize atmospheric pressure plasma.

  Further, the functional group 120 is not only applied to the sliding surface of the main body 110, but also existing techniques such as corona discharge and glow discharge can be used.

(Example)
As resin, PPS simple substance, PPS mixed with 30% carbon fiber (hereinafter referred to as “carbon-containing PPS”), PPS mixed with 40% glass fiber (hereinafter referred to as “glass-containing PPS”) Using the technique described in Japanese Patent Application Laid-Open No. 2012-102205, ECR plasma treatment was performed. Specifically, as a pretreatment, first, the resin was exposed to an argon plasma atmosphere, and argon ions were allowed to act on the surface of the resin. Subsequently, the pretreated resin was exposed to a plasma atmosphere of a mixed gas of argon and oxygen to give a functional group 120 to the surface of the resin.

  Hereinafter, a PPS simple substance that has not been subjected to the treatment for imparting the functional group 120 is referred to as Comparative Example 1, a carbon-containing PPS as Comparative Example 2, and a glass-containing PPS as Comparative Example 3. Example A, carbon-containing PPS is referred to as Example B, and glass-containing PPS is referred to as Example C.

(X-ray photoelectron spectroscopy)
X-ray photoelectron spectroscopy (XPS) was performed for each of Examples A to C and Comparative Examples 1 to 3 described above. 2 is a diagram showing XPS results of Example A and Comparative Example 1, FIG. 3 is a diagram showing XPS results of Example B and Comparative Example 2, and FIG. 4 is Example C and Comparative Example 3. It is a figure which shows the XPS result. 2 to 4, the XPS results of Examples A to C are indicated by solid lines, and the XPS results of Comparative Examples 1 to 3 are indicated by broken lines. 2 to 4, the vertical axis represents signal intensity representing the intensity of photoelectrons obtained by the XPS apparatus, and the horizontal axis represents binding energy (eV).

  As shown by arrows in FIGS. 2A to 4A, in Examples A to C, the signal intensity increases from 288 eV to 292 eV (peaks appear) as compared with Comparative Examples 1 to 3. doing). That is, a peak indicating the C1s orbit appears. From these results, the functional group 120 containing carbon and oxygen, C—O, C═O (carbonyl group), and O—C═O (carboxyl group), which are functional groups 120 containing carbon and oxygen, are obtained by performing the treatment for imparting the functional group 120. It was confirmed that it could be applied to the surface of the resin.

  Further, as shown in FIGS. 2A and 3A, it was found that the peak area of the peak indicating the C1s orbit was larger in Example B than in Example A. Thus, it was confirmed that a large amount of functional groups 120 can be imparted to the surface of the resin by mixing carbon with PPS.

Further, as indicated by arrows in FIGS. 2B to 4B, in Examples A to C, the signal intensity increases from 166 eV to 172 eV (peak) as compared with Comparative Examples 1 to 3. Has appeared). That is, a peak indicating the S2p orbit appears. From these results, it was confirmed that SO ₃ H (sulfo group), which is a functional group 120 containing sulfur and oxygen, can be imparted to the surface of the resin by performing a treatment for imparting the functional group 120.

  Further, as shown in FIGS. 2B and 3B, it was found that the peak area of the S2p orbital peak was larger in Example B than in Example A. This is presumed that oxidation is promoted by the carbon (carbon material) contained in Example B. From this result, it was confirmed that a large amount of functional groups 120 could be imparted to the surface of the resin by mixing a carbon material with PPS.

(Contact angle measurement)
FIG. 5 is a diagram for explaining the contact angle. As shown in FIG. 5, the contact angle is an angle θ formed by a tangent line on the surface of the edge of the liquid and the solid surface in a state where the liquid is in contact with the solid surface. 2 μm of water was dropped on the surfaces of Example A in which the functional group 120 was added to the PPS simple substance and Comparative Example 1 which was a PPS simple substance not subjected to any treatment, and the contact angle θ was measured.

  As a result, in Comparative Example 1, the contact angle θ was about 95 °, whereas in Example A, the contact angle θ was about 25 °. That is, it was confirmed that the contact angle on the surface of the resin can be reduced by performing the treatment for imparting the functional group 120. The ability to reduce the contact angle θ is synonymous with the ability to increase the surface energy of the resin (solid). That is, by performing the treatment for imparting the functional group 120, the surface energy of the resin can be increased, and the affinity with a liquid such as water (lubricating liquid 200) can be increased. It was confirmed that it could be spread on the resin surface.

  The technique described in Japanese Patent Application Laid-Open No. 2012-102205 is a technique developed to improve the adhesiveness and printability of the resin, which has nothing to do with the sliding member, friction, and wear. However, the inventor of the present application pays attention to the fact that the technique improves the hydrophilicity of the resin, and has found application to a sliding member using water as a lubricating liquid. In addition, the resin described in Japanese Patent Application Laid-Open No. 2012-102205 is difficult to apply as the sliding member 100 because of its relatively low mechanical strength and a low operating temperature range.

  Therefore, as described above, when the functional group 120 is imparted to the resin using vacuum plasma such as the technique described in Japanese Patent Application Laid-Open No. 2012-102205, it can be confirmed from the measurement result of the contact angle θ. Further, it was found that the surface energy of the resin itself can be improved. As a result, the surface energy of the resin is improved by the functional group 120 imparted to the resin, so that the lubricating liquid 200 is spread on the resin surface even when other liquids are used as the lubricating liquid. It is estimated that Therefore, the sliding member 100 according to the present embodiment can improve the wear resistance by increasing the affinity between the sliding member 100 and the lubricating liquid 200 regardless of the type of the lubricating liquid 200. Conceivable.

(Underwater pin-on-disk test)
The sample was fixed in water, the sample was rotated while the pin was in contact with the sample surface, and the sample and the pin were rotated and slid to measure the coefficient of friction of the sample. The friction coefficient was measured using Examples A to C and Comparative Examples 1 to 3 as samples.

  FIG. 6 is a diagram for explaining the results of the underwater pin-on-disk test. In FIG. 6, Example A is a solid line, Example B is a broken line, Example C is a dotted line, Comparative Example 1 is a thick line, Comparative Example 2 is a one-dot chain line, and Comparative Example 3 is a two-dot chain line. Each is shown. In FIG. 6, the vertical axis indicates the friction coefficient (μ), and the horizontal axis indicates the sliding distance (m).

  As shown in FIG. 6, it was confirmed that the friction coefficient of Example A was lower than that of Comparative Example 1. Further, it was confirmed that even when the sliding distance was increased, that is, the sliding time was increased, the friction coefficient of Example A was lower than that of Comparative Example 1. Similarly, the friction coefficient of Example B is lower than that of Comparative Example 2 and that of Example C is lower than that of Comparative Example 3, and the friction coefficient is lower even when the sliding distance is increased. It was confirmed that

  From the above results, it was confirmed that the coefficient of friction of the resin can be reduced by performing the treatment for imparting the functional group 120. Thus, by using a resin as the sliding member 100 and adding the functional group 120 to the sliding surface of the resin, the friction coefficient of the sliding surface of the sliding member 100 can be reduced. It was found that the wear resistance of can be improved.

  As described above, according to the sliding member 100 according to the present embodiment, the main body 110 of the sliding member 100 is made of resin, and the functional group 120 containing oxygen is arranged on the sliding surface of the main body 110. Thus, the affinity for the lubricating liquid 200 can be increased on the sliding surface, and the wear resistance of the sliding member 100 can be improved.

  Further, the above-described sliding member 100 is used for devices such as bearing members (thrust bearings and journal bearings), seal members (lip seals and mechanical seals), water injection type air compressors, submersible pumps, fuel pumps and the like. Thus, the wear resistance of the sliding member 100 in the bearing member, the seal member, and the apparatus can be improved.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  The present invention can be used for a sliding member, a bearing member, a seal member, and an apparatus.

DESCRIPTION OF SYMBOLS 100 ... Sliding member 110 ... Main-body part 120 ... Functional group 200 ... Lubrication liquid

Claims (7)

A sliding member to which water is supplied as a lubricating liquid,
It has a resin body,
A sliding member, wherein a functional group containing oxygen is added to a sliding surface of the main body.   The sliding member according to claim 1, wherein the main body includes a carbon material in addition to the resin.   The sliding member according to claim 1 or 2, wherein the resin is polyphenylene sulfide.   The bearing member characterized by including the sliding member of any one of Claim 1 to 3.   A sealing member comprising the sliding member according to claim 1.   An apparatus comprising the sliding member according to any one of claims 1 to 3.   A device capable of supplying water as a lubricating liquid,
  The apparatus includes a sliding member to which the lubricating liquid is supplied,
  The sliding member comprises a resin main body,
  An apparatus in which a layer having a functional group containing oxygen is formed as a sliding surface in contact with the resin main body.

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