JP2009079138A - Sliding structure or sliding method - Google Patents

Abstract

The present invention provides a sliding structure capable of suppressing wear of an amorphous carbon film due to a chemical reaction between the amorphous carbon film and an organic molybdenum compound.
A pair of sliding members in which an amorphous carbon coating 31 containing a hydrogen element is formed on a sliding surface of at least one sliding member 30 among a pair of sliding members 20 and 30 that slide relative to each other. A sliding structure 1 comprising at least a member 20 and a lubricant La present between the pair of sliding members 20 and 30 and containing at least an organomolybdenum compound, wherein the sliding structure 1 is at least A cooling mechanism 40 is provided for cooling the sliding surface on which the amorphous carbon coating 31 is formed.
[Selection] Figure 1

Description

  The present invention relates to a sliding structure including a pair of sliding members in which an amorphous carbon film is formed on a sliding surface of at least one sliding member among a pair of sliding members sliding relative to each other, In particular, the present invention relates to a sliding structure including a lubricant containing an organomolybdenum compound between the pair of sliding members.

  In recent years, resource protection, reduction of environmental pollution, and prevention of global warming have attracted attention in various countries, and in particular, improvement of exhaust gas regulations has become an issue even in the automobile industry. As a means for solving this problem, development of technologies for reducing fuel consumption is being pursued. In particular, improving the sliding characteristics of the sliding member constituting the engine and the valve-operating sliding member directly reduces energy loss and directly leads to lower fuel consumption of the automobile.

  For example, in order to improve the wear resistance of such a sliding member and obtain low friction characteristics, there is a technique for coating the sliding surface of the sliding member. In recent years, since a film can be formed in a low-temperature and low-pressure atmosphere, amorphous carbon materials such as diamond-like carbon (DLC) are widely used as the coating material. The film (amorphous carbon film) formed of the amorphous carbon material is a hard film mainly composed of carbon, and the carbon of the hard film also acts as a solid lubricant. It is a coating that can achieve both resistance and high wear resistance.

  For example, as such an example, a pair of sliding members in which a DLC film (amorphous carbon film) is formed on the surface of a base material, and a dialkyldithiocarbamine as an organomolybdenum compound on the sliding surfaces of the pair of sliding members. A sliding structure including a lubricant containing molybdenum acid molybdenum (Mo-DTC) has been proposed (see Patent Document 1).

According to this sliding structure, at the time of sliding, the organic molybdenum compound becomes molybdenum disulfide between the sliding surfaces. Since the molybdenum disulfide acts as a solid lubricant, the sliding characteristics of the sliding member can be improved.
JP 2004-339486 A

By the way, when the amorphous carbon film is formed by chemical vapor deposition (CVD), droplets and the like are not generated on the surface as compared with those formed by physical vapor deposition (PVD). In addition, the surface roughness of the amorphous carbon coating can be lowered, and the friction coefficient of the sliding member and the partner attacking property against the partner member can be reduced. However, since the amorphous carbon film by CVD is formed at a relatively low temperature and low pressure, hydrogen (hydrogen derived from hydrocarbons such as CH ₄ ) is used as a carbon-carbon bonding aid. As the sliding member slides, the amorphous carbon material containing a hydrogen element and the organic molybdenum compound in the lubricant may chemically react to cause wear of the amorphous carbon coating.

Specifically, as shown in FIG. 7, a part of the organomolybdenum compound is thermally decomposed by frictional heat between the sliding members, and molybdenum trioxide (MoO ₃ ) that is an oxidation catalyst is generated. When the sliding member contacts at high surface pressure (P) and high sliding speed (V) in an environment where the molybdenum trioxide is present, a hydrogen element in the amorphous carbon coating is obtained by a kind of reduction action. May be detached from the film, leading to a decrease in strength of the amorphous carbon film. In this way, the carbon from which the hydrogen element is desorbed becomes the active site, and the carbon that has become the active site chemically reacts with molybdenum trioxide and desorbs from the film, and carbon monoxide or carbon dioxide gas and Become. Furthermore, the carbon desorbed by the reaction causes the carbon bonded to the desorbed carbon to become an active site, chemically react with molybdenum trioxide and desorb from the film, and carbon monoxide or carbon dioxide It becomes gas. As described above, it is considered that the wear of the amorphous carbon coating proceeds and accelerates by repeating the chemical reaction on the surface of the amorphous carbon coating in a superimposed manner.

  The present invention has been made in view of such a problem, and the object is to use a lubricant containing an organic molybdenum compound in an amorphous carbon film containing a hydrogen element. In addition, the friction coefficient reduction characteristics of the combination of the amorphous carbon coating and the lubricant containing the organomolybdenum compound are maintained, and the amorphous carbon by the chemical reaction between the amorphous carbon coating and the organomolybdenum compound is maintained. It is providing the sliding structure which can suppress abrasion of a film.

  The inventors of the present invention have focused on molybdenum trioxide produced by a thermal decomposition reaction of an organomolybdenum compound by performing many experiments and studies to solve the above-described problems. Then, the inventors of the present invention can suppress the thermal decomposition reaction caused by frictional heat between the sliding members and the hydrogen desorption reaction using molybdenum trioxide generated by the reaction as a catalyst. The inventors obtained new knowledge that the wear caused by the chemical reaction of the amorphous carbon coating can be reduced if the heat generation due to frictional heat on the sliding surface on which the metal is formed can be suppressed.

  The present invention is based on the above-described new knowledge obtained by the present inventors, and the sliding structure according to the present invention includes at least one sliding member among a pair of sliding members that slide relative to each other. At least a pair of sliding members having an amorphous carbon film containing a hydrogen element formed on the sliding surface, and a lubricant present between the pair of sliding members and containing at least an organic molybdenum compound. The sliding structure includes a cooling mechanism that cools at least the sliding surface on which the amorphous carbon film is formed.

  According to the present invention, by using the cooling mechanism to cool the sliding surface on which the amorphous carbon film is formed, heat generation due to frictional heat on the sliding surface on which the amorphous carbon film is formed is suppressed, and organic Generation of molybdenum trioxide from the molybdenum compound and accompanying wear of the amorphous carbon film can be suppressed.

  That is, until now, the organic molybdenum compound is thermally decomposed by the frictional heat generated when the sliding member slides to produce molybdenum trioxide, and the amorphous carbon coating is weakened by the chemical reaction by the molybdenum trioxide. However, in the present invention, the heat generation due to the frictional heat can be suppressed by the cooling mechanism, and the generation of molybdenum trioxide due to the thermal decomposition of the organic molybdenum compound can be suppressed. Furthermore, even if molybdenum trioxide is generated, it is possible to suppress the elimination of hydrogen element from the amorphous carbon film by molybdenum trioxide by suppressing heat generation. The wear of the carbonaceous film can be reduced.

  In the present invention, “a pair of sliding members that slide relative to each other” refers to a sliding member in which at least one sliding member slides relative to the other sliding member. The movement refers to sliding by linear movement, rotational movement, or a combination of these movements.

  The term “cooling the sliding surface on which the amorphous carbon film is formed” as used in the present invention means that the sliding surface on which the amorphous carbon film is formed when a pair of sliding members slide. The “cooling mechanism” is a mechanism for suppressing the heat generation.

  By the way, the cooling mechanism according to the present invention does not cool the sliding surface on which the amorphous carbon film is indirectly formed by directly cooling the lubricant, but cooling either one of the sliding members. It is preferable to provide a mechanism and cool at least the sliding surface on which the amorphous carbon film is formed. That is, when the lubricant is cooled directly to suppress the above series of reactions, the viscosity of the lubricant decreases and the viscosity resistance (sliding resistance) increases, and the amorphous carbon coating and the organic molybdenum There is a possibility of impairing the effect of reducing the friction coefficient by the combination with the compound.

  As a more preferred aspect, the cooling mechanism of the sliding structure according to the present invention is disposed on the sliding member on which the amorphous carbon film is formed. According to the present invention, the cooling mechanism is disposed on the sliding member on which the amorphous carbon film is formed, so that the sliding surface of the sliding member on which the amorphous carbon film is formed can be cooled more efficiently. (Suppressing heat generation) and promoting the wear of the amorphous carbon film can be suppressed.

  The amorphous carbon film is a film (DLC film) made of so-called DLC (diamond-like carbon), and the amorphous carbon film uses sputtering, vacuum deposition, ionization deposition, ion plating, or the like. The film may be formed by physical vapor deposition (PVD), may be formed by chemical vapor deposition (CVD) utilizing plasma treatment, or may be formed by a combination of these methods. Also good. The amorphous carbon coating may contain additional elements such as Si, Cr, Mo, Fe, and W, and the surface hardness of the coating is adjusted by adding such elements. You can also.

  Further, the surface hardness of the amorphous carbon film of the sliding member is preferably in the range of Hv1000 to Hv4000. When the surface hardness is less than Hv1000, the amorphous carbon film is easily worn and larger than Hv4000. In this case, the adhesion between the amorphous carbon film and the base material of the sliding member is reduced. Further, the film thickness of the coating of the sliding member is preferably 0.1 μm or more. If the film thickness is smaller than this thickness, the film is worn away at the time of sliding, and the desired effect is obtained. Can't get. Further, in order to improve the adhesion of the amorphous carbon coating between the substrate and the amorphous carbon coating, it is selected from Ta, Ti, Cr, Al, Mg, W, V, Nb, and Mo. An intermediate layer made of one or more metal elements may be formed.

  Further, the organic molybdenum compound contained in the lubricant includes molybdenum-amine complex, molybdenum-succinimide complex, molybdenum salt of organic acid, molybdenum salt of alcohol, molybdenum dialkyldithiocarbamate (Mo-DTC) or molybdenum dithiophosphate. (Mo-DTP) etc. can be mentioned, As a more preferable aspect, the organomolybdenum compound concerning this invention is molybdenum dialkyl dithiocarbamate (Mo-DTC) or molybdenum dithiophosphate (Mo-DTP).

According to the present invention, molybdenum disulfide (MoS ₂ ) is generated on the surface of the sliding member by using molybdenum dialkyldithiocarbamate (Mo-DTC) or molybdenum dithiophosphate (Mo-DTP) as the organic molybdenum compound. The molybdenum sulfide is formed as a solid lubricant film on the sliding surface. As a result, in addition to suppressing chemical wear of the amorphous carbon film formed on the sliding surface of the sliding member, wear of the sliding member due to mechanical contact between the sliding surfaces is further suppressed. can do.

  In particular, in consideration of versatility, cost, etc., the organomolybdenum compound contained in the lubricant is more preferably molybdenum dialkyldithiocarbamate (Mo-DTC), and the structure of the alkyl group in the molecule varies depending on the production method. For example, specific examples of molybdenum alkyldithiocarbamate include, for example, molybdenum dibutyldithiocarbamate, sulfurized dipentyldithiocarbamate, sulfurized dihexyldithiocarbamate, sulfurized diheptyldithiocarbamate, sulfide dioctyldithiocarbamate, dinonyldithiocarbamate. Molybdenum, didecyl dithiocarbamate molybdenum sulfide, diundecyldithiocarbamate molybdenum sulfide, molybdenum dododecyldithiocarbamate, molybdenum ditridecyldithiocarbamate, etc., each of which can be used alone or in combination of two or more. be able to.

  Specific examples of molybdenum dithiophosphate (Mo-DTP) include molybdenum diisopropyldithiophosphate, molybdenum diisobutyldithiophosphate, molybdenum dipropyldithiophosphate, molybdenum dibutyldithiophosphate, molybdenum dipentyldithiophosphate, molybdenum dihexyldithiophosphate, and diheptyldithiophosphorus. Examples thereof include molybdenum acid and molybdenum diphenyldithiophosphate, and these can be used alone or in admixture of two or more.

  The lubricant base oil is not particularly limited as long as it contains the additives as described above, and includes mineral oil and synthetic oil. Such lubricants can be appropriately added with an antioxidant, an antiwear agent, an extreme pressure agent, a friction modifier, a metal deactivator, a detergent, a rust preventive, an antifoaming agent, and the like. Note that the above-described effect of suppressing the thermal decomposition of the organic molybdenum compound can be obtained by using, for example, grease in which a thickener is further dispersed in a base oil containing an organic molybdenum compound instead of the lubricant.

  In addition, examples of the lubricant supply mechanism include a circulation lubrication mechanism, a mist lubrication mechanism, and an oil bath lubrication mechanism using an oil bath. The lubricant can be supplied between the sliding members during sliding. If it is, it will not specifically limit.

  In the sliding structure according to the present invention, the other sliding member is more preferably a sliding member made of an iron-based material. According to the present invention, by using the other sliding member as an iron-based material, the iron-based material is molybdenum disulfide produced from molybdenum dialkyldithiocarbamate (Mo-DTC) or molybdenum dithiophosphate (Mo-DTP). Therefore, not only the wear of the iron-based material but also the wear of the amorphous carbon film can be suppressed. Further, the “iron-based material” referred to in the present invention may be either a steel-based material or a cast-iron-based material, and the material of the surface that contacts and slides the amorphous carbon coating is steel, or If it is a cast iron-type material, it will not specifically limit.

  A more suitable sliding method is also disclosed as the present invention. The sliding method according to the present invention includes a pair of sliding members in which an amorphous carbon film containing a hydrogen element is formed on a sliding surface of at least one sliding member among a pair of sliding members sliding relative to each other. A sliding method of sliding the pair of sliding members relative to each other while supplying a lubricant containing at least an organomolybdenum compound between the members, the sliding method comprising at least the amorphous carbon coating The sliding is performed while cooling the sliding surface on which is formed.

  According to the present invention, by cooling the sliding surface on which the amorphous carbon film is formed, heat generation due to frictional heat on the sliding surface on which the amorphous carbon film is formed is suppressed, and non-chemical reaction is not caused. Abrasion of the crystalline carbon coating can be suppressed. The cooling temperature varies depending on the sliding conditions, the characteristics of the lubricant, etc., but it is preferable to cool so as to suppress the thermal decomposition reaction that molybdenum trioxide is generated from the organomolybdenum compound, and more preferably by molybdenum trioxide. The cooling is performed so as to suppress the reaction of desorbing the hydrogen element from the amorphous carbon film. The cooling suppresses the chemical reaction, so that the wear of the amorphous carbon film can be surely reduced.

  In the sliding method according to the present invention, it is more preferable that the sliding surface is cooled by cooling the sliding member on which the amorphous carbon film is formed. According to the present invention, by performing the cooling, the sliding surface of the sliding member on which the amorphous carbon coating is formed is cooled more efficiently (suppressing heat generation), and the wear of the amorphous carbon coating is reduced. Promotion can be reduced.

In the sliding method according to the present invention, it is more preferable to use molybdenum dialkyldithiocarbamate (Mo-DTC) or molybdenum dithiophosphate (Mo-DTP) as the organic molybdenum compound. According to the present invention, as described above, molybdenum disulfide (MoS ₂ ) is generated on the sliding surface from molybdenum dialkyldithiocarbamate (Mo-DTC) or molybdenum dithiophosphate (Mo-DTP), and wear of the sliding member is reduced. It can be further reduced.

  According to the present invention, even when a lubricant containing an organomolybdenum compound is used on the sliding surface on which the amorphous carbon coating containing hydrogen element is formed, the hydrogen element and the organic carbon in the amorphous carbon coating are used. Abrasion of the amorphous carbon film due to a chemical reaction with the molybdenum compound can be suppressed.

  Embodiments of a sliding structure according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a sliding structure according to the present invention.

  As shown in FIG. 1, the sliding structure 1 according to the present invention includes a first sliding member 20 and a second sliding member 30 as a pair of sliding members that slide relative to each other. The lubricant L is disposed between the first sliding member 20 and the second sliding member 30.

  The first sliding member 20 is made of, for example, a steel material, and is configured to be slidable while being pressed with a predetermined pressure against the sliding surface 33 of the second sliding member 30. . In the second sliding member 30, an amorphous carbon film 31 containing a hydrogen element is formed on a sliding surface 33 that slides on the first sliding member 20 of the substrate 32. The lubricant L is supplied to the sliding surface 33 between the first sliding member 20 and the second sliding member 30 by a predetermined supply means (not shown) such as an oil supply device. The base oil contains at least molybdenum dialkyldithiocarbamate (Mo-DTC) as an organic molybdenum compound.

  Further, in the sliding structure 1, the cooling mechanism 40 is disposed on the second sliding member 30. The cooling mechanism 40 cools the sliding surface 33 on which the amorphous carbon coating 31 is formed. More specifically, the cooling mechanism 40 slides between the first sliding member 20 and the second sliding member 30. It suppresses heat generation of frictional heat of the sliding surface 33 due to movement. Examples of the cooling mechanism 40 include a cooling mechanism such as a water-cooled type and an air-cooled type, and thermal decomposition from Mo-DTC to molybdenum trioxide, which will be described later, or from an amorphous carbon coating with molybdenum trioxide to a hydrogen element. The cooling method is not particularly limited as long as the sliding surface 33 on which the amorphous carbon film 31 is formed can be cooled so that the elimination reaction can be suppressed.

  According to the sliding structure 1 configured as described above, even when the lubricant L containing an organic molybdenum compound is used for the amorphous carbon coating 31 containing the hydrogen element, Abrasion of the amorphous carbon coating caused by a chemical reaction with the organomolybdenum compound can be suppressed. In addition, the combination of the amorphous carbon material of the amorphous carbon coating 31 and the Mo-DTC of the lubricant L can reduce the friction coefficient between the sliding members.

Hereinafter, the present invention will be described by way of examples.
[Example]
(Sliding structure)
In order to manufacture the sliding structure 1A shown in FIG. 2, first, as a pair of sliding members that slide relative to each other, a plate test piece 30a in which an amorphous carbon coating 31a is formed on a ball test piece 20a and a base material 32a. And prepared. Further, a support base 34 for supporting the plate test piece 30a and a water-cooling type cooling mechanism 40a for cooling the amorphous carbon coating 31 are provided, and grease La is supplied to the sliding surface 33a of the plate test piece 30a as a lubricant. did. Details are shown below.

<Ball specimen>
As shown in FIG. 2A, a spherical ball test of 10 mm in diameter, Rockwell hardness HRC62 (equivalent to Vickers hardness Hv700), material 100CR-6 (JIS standard: equivalent to high carbon chromium bearing steel (SUJ2)) A piece 20a was prepared.

<Plate test piece>
As shown in FIG. 2, as a base material 32a for forming an amorphous carbon coating 31a, a material 100CR-6 (high diameter 24 mm × thickness 7.9 mm) having a surface roughness of 10-point average roughness Rz 0.1 μm (high A carbon-chromium bearing steel (SUJ2: JIS standard) is prepared, and an amorphous material containing a hydrogen element is formed on the surface of the substrate 32a with a diameter of 24 mm by plasma CVD so as to have a thickness of 6 μm and a surface hardness of Hv700. A plate test piece 30a on which a carbonaceous film 31a (HT-DLC (thick film, high-reliability DLC: manufactured by Japan IT Corporation)) was formed was prepared.

<Grease>
As a lubricant to be supplied between the ball test piece 20a and the plate test piece 30a (between both sliding surfaces), a grease La containing molybdenum dialkyldithiocarbamate (Mo-DTC) was prepared.

<Cooling mechanism>
A concave portion is provided on the surface opposite to the sliding surface 33a of the plate test piece 30a, a through hole is provided at a position of the support base 34 corresponding to the concave portion, and a hollow having an inner diameter of 3 mm is fitted to the concave portion and the through hole. A copper rod formed with a part was inserted, and a 25 ° C. LLC (long life coolant) W was circulated through the hollow part to provide a cooling mechanism.

<Friction and wear test>
As shown in FIGS. 2 and 3 (a), an abrasion test was performed using an SRV tester. Specifically, grease La at 80 ° C. is supplied between the plate test piece 30a and the ball test piece 20a, and the surface pressure during sliding is 2.47 GMa on the plate test piece 30a and the ball test piece 20a. A load of 150 N was applied so that the slide was slid at a frequency of 50 Hz, a sliding amplitude of 1.5 mm, a sliding speed of 0.15 mm / second, and a sliding time of 10 minutes, and the test was performed at room temperature.

  The appearance of the sliding surface 33a of the plate test piece was observed. The result is shown in FIG. As shown in FIGS. 3B and 3C, the maximum wear depth along the line A-A ′ of the sliding portion of the sliding surface 33a of the plate test piece 30a was measured. The result is shown in FIG. Further, in the same manner as in the above test, the load acting on the plate test piece 30a and the ball test piece 20a was changed to the load shown in FIG. 6, and the friction coefficient corresponding to each load was measured. The result is shown in FIG.

  FIG. 3A is a view for explaining the sliding structure according to the present embodiment, and FIG. 3B is a view of the plate test piece after sliding according to the present embodiment (after completion of the friction test). It is a figure for demonstrating a state, (c) is AA 'sectional drawing of (b).

[Comparative example]
The same plate test piece, ball test piece, and lubricant as in the example were prepared. The difference from the embodiment is that no cooling mechanism is provided. And the friction abrasion test was done like the Example. FIG. 4B shows the result of appearance observation, FIG. 5 shows the result of wear depth, and FIG. 6 shows the measurement result of the friction coefficient in accordance with the load. As a reference example, FIG. 5 also shows the measurement results of the friction coefficient when grease La having a temperature of 25 ° C. is supplied as a lubricant under the same conditions as in the comparative example.

[Result 1]
As shown in FIGS. 3A and 3B, wear marks were formed on the sliding surface 33a of the plate test piece of the comparative example. As shown in FIG. 3, the working depth of the example was smaller than that of the comparative example.

[Result 2]
As shown in FIG. 5, the friction coefficients of the example and the comparative example are similar and lower than the friction coefficient of the reference example.

[Discussion 1]
As shown in the result 1, the wear depth in the example was smaller than that in the comparative example because the amorphous carbon film 31a of the plate test piece 30a was formed during sliding in the example as compared with the comparative example. This is probably due to the fact that the temperature of the sliding surface 33a was low.

  That is, in the example, by providing the cooling mechanism 40a, the thermal decomposition of the organomolybdenum compound to molybdenum trioxide and the elimination reaction of hydrogen of the amorphous carbon material by molybdenum trioxide are suppressed, and the chemical reaction This is thought to be due to the suppression of wear caused by

  Furthermore, mechanical wear is also suppressed by further forming a film made of molybdenum disulfide acting as a solid lubricant on the sliding surface 33a of the plate test piece 30a and the sliding surface of the opposing ball test piece 20a. It is thought that it was done.

[Discussion 2]
As shown in the result 2, the value of the coefficient of friction in the example and the comparative example was smaller than that in the reference example because the grease temperature was as high as 80 ° C., the viscosity of the lubricant was low, and the viscous resistance was small. It is thought that. Further, since the friction coefficients of the example and the comparative example are similar, even when the cooling mechanism is provided as in the example, the grease La is not directly cooled. It is considered that there was almost no decrease in the viscosity of the agent.

  From the above, the sliding structure according to the example can suppress wear due to a chemical reaction by locally cooling the sliding surface 33a of the plate test piece 30a. Even when a cooling mechanism is provided, it is considered that the effect of reducing the friction coefficient can be maintained.

  As mentioned above, although embodiment of this invention and the Example which concerns on the embodiment were explained in full detail, this invention is not limited to the said embodiment and Example, The spirit of this invention described in the claim Various changes can be made in the design without departing from the above.

  The sliding structure according to the present invention has a high sliding frequency, such as a sliding part of an engine combining a piston ring and a cylinder, a sliding part of a cam lifter combining a cam and a cam follower, and wear resistance and low friction. Is preferably used in an environment where the

The conceptual diagram of the sliding structure which concerns on this embodiment. The schematic diagram of the sliding structure concerning a present Example. FIG. 2A is a diagram for explaining the sliding structure according to the present embodiment, and FIG. 2B shows the state of the plate test piece after sliding according to the present embodiment (after completion of the friction test). It is a figure for demonstrating, (c) is AA 'sectional drawing of (b). It is the photograph at the time of carrying out external appearance observation of the sliding surface in which the amorphous carbon film of the Example and the comparative example was formed, (a) is a photograph figure of the sliding surface of an Example, (b) These are the photograph figures of the sliding surface of the comparative example 1. FIG. The figure which showed the measurement result which measured the abrasion depth of the amorphous carbon film formed in the sliding surface of an Example and a comparative example. The figure which showed the result of having measured the change of the friction coefficient at the time of changing a load in the sliding structure of an Example and a comparative example. The figure for demonstrating the mechanism of abrasion generation by the chemical reaction of an amorphous carbon film.

Explanation of symbols

  1, 1A: sliding structure, 20: first sliding member, 20a: ball specimen, 30: second sliding member, 30a: plate specimen, 31, 31a: amorphous carbon coating, 32, 32a: base material, 33, 33a: sliding surface, 34: support base, 40, 40a: cooling mechanism, L: lubricant, La: grease

Claims (6)

Of a pair of sliding members that slide relative to each other, a pair of sliding members in which an amorphous carbon film containing a hydrogen element is formed on a sliding surface of at least one sliding member, and the pair of sliding members A sliding structure comprising at least a lubricant containing at least an organomolybdenum compound,
The sliding structure includes a cooling mechanism that cools at least a sliding surface on which the amorphous carbon film is formed.   The sliding structure according to claim 1, wherein the cooling mechanism is disposed on a sliding member on which the amorphous carbon film is formed.   The sliding structure according to claim 1 or 2, wherein the organic molybdenum compound is molybdenum dialkyldithiocarbamate (Mo-DTC) or molybdenum dithiophosphate (Mo-DTP). Among a pair of sliding members that slide relative to each other, an organomolybdenum compound is interposed between a pair of sliding members in which an amorphous carbon film containing a hydrogen element is formed on the sliding surface of at least one sliding member. A sliding method of sliding the pair of sliding members relative to each other while supplying a lubricant containing at least,
The sliding method is characterized in that the sliding is performed while cooling at least the sliding surface on which the amorphous carbon film is formed.   The sliding method according to claim 4, wherein the sliding surface is cooled by cooling the sliding member on which the amorphous carbon film is formed.   The sliding method according to claim 4 or 5, wherein molybdenum dialkyldithiocarbamate (Mo-DTC) or molybdenum dithiophosphate (Mo-DTP) is used as the organic molybdenum compound.

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