JP4844914B2 - Formation method of lubrication layer by molybdenum disulfide. - Google Patents

Description

This invention is a powder spray lubrication of molybdenum disulfide for use in sliding surfaces that require load resistance, low wear resistance, and low friction for various industries such as automobiles and construction machines, and to reduce friction. The present invention relates to a layer generation method.

Lubricants containing solid lubricants (molybdenum disulfide, graphite, PTFE, etc.) compared to general-purpose greases and oils are used in the field of special lubrication with a higher lubricating effect. The special lubricant containing the solid lubricant is used by being mixed in a liquid material such as grease, paste, or oil. As an example of the above, an invention of a rust preventive lubricant in which molybdenum disulfide (hereinafter referred to as MoS ₂ ) powder is mixed in rust preventive oil has been proposed.

As another example, an invention of a lubricant composition for high temperature in which a MoS ₂ powder is dispersed in a dispersion medium containing a trialkyl phosphate and a surfactant is mixed is proposed.
JP 3-34797 Japanese Patent Publication 8-19434

  The conventionally known grease, paste or oil containing a solid lubricant has a lubricating effect that is higher than that of the original grease or the like. However, when viewed from the solid lubricant, there is a problem that the lubricating effect under a high load is lowered. This is because it is often used unavoidably from the point of use, and it was used in places where there was no application method for places where it was difficult to use solid lubricants.

  Therefore, there was a problem that it had to depend on grease, paste, or oil that had adhesiveness and was easy to apply.

  As a result of relying on the grease, paste, or oil, there is a problem that the characteristics of the solid lubricant must be sacrificed for the demand for load resistance, low wear, or low friction.

This invention uses only solid lubricant (MoS ₂ ) powder, sprays it onto the sliding surface at a high pressure, and provides a lubricating layer on the sliding surface, thereby using a medium such as grease or oil. Without this, MoS ₂ was adhered to the sliding surface to solve the conventional problem.

That is, the present invention is composed of 1% to 10% (mass) of molybdenum disulfide powder having a particle size of 0.1 μm to 200 μm, 2% to 8% (mass) of oil that evaporates without heating. solvent 2% to 8% (by weight) and 95% (mass) were mixed liquefied high-pressure gas for injection to a maximum, lubricating layer and the mixture is sprayed into the cylinder inner sliding surface above the pressure 0.3MPa the A method for producing a lubricating layer in a cylinder, characterized in that the lubricating layer is provided and dried.

Moreover, 1% to 10% (mass) of molybdenum disulfide powder having a particle size of 0.1 μm to 200 μm, 2% to 8% (mass) of ester oil component of synthetic oil, and 2% to 8% (mass of organic solvent) ) and 95% (by mass) was mixed with liquefied high-pressure gas for injection of up mixture, a lubricating layer provided sprayed on the cylinder inner sliding surface the mixture above the pressure 0.3 MPa, the lubricating A method for producing a lubricating layer in a cylinder characterized in that the layer is dried.

In the present invention, even if the size of the MoS ₂ powder is 0.1 μm or less, the efficacy does not change, so 0.1 μm is the lower limit. On the other hand, if it is 200 μm or more, the sliding surface of the MoS ₂ spray may become uneven, so 200 μm was set as the upper limit.

Next, if the concentration of MoS ₂ is 1% or less, the antifriction layer forming efficiency may be lowered. If it is 10% or more, the uniformity may be hindered in relation to the high-pressure gas. The range was 1% to 10%. The concentration cannot be uniformly determined in relation to the particle size, but when the average particle size is 10 μm, a concentration of 4% to 7% is preferable.

The pressure of the high-pressure gas in the present invention is intended to spray MoS ₂ on the sliding surface to ensure adhesion, and is usually 0.3 MPa or more, but 0.3 MPa to 0.5 MPa is used.

In the first aspect of the invention, it has been found that only the MoS ₂ powder and the high-pressure gas for injection are insufficient in adhesion depending on the intended use.

  Therefore, the above problem was solved, and as a result of research to achieve the intended purpose under any conditions and applications, the invention of claim 2 was completed. That is, adding a small amount of oil as a medium to wet the adherend to create a liquid lubricating film, and further diluting with a small amount of solvent to make it spray, impairing the characteristics as a nearly pure powder spray It was found that it can be sprayed without any problems.

  In place of the oil described above, grease, a binder for paint, and the like can be considered, but oil is better for the cylinder.

  The oil used in the present invention is preferably an oil that evaporates with heating and does not leave as much residue (carbon) as possible, for example, an ester oil of synthetic oil.

  Organic solvents include hydrocarbon solvents, ketone solvents, and aromatic solvents, but hydrocarbon solvents are preferred from the environment.

In addition to the solvent, of course, it has been found that the oil in this medium is extremely volatile at a high temperature of 200 ° C. or higher, and only the MoS ₂ powder is obtained.

  In the said invention, when the oil and organic solvent to add were 1% (mass) or less, it became clear that adhesiveness became insufficient and the adhesion state became non-uniform | heterogenous. Moreover, even if the oil and the organic solvent are 10% (mass) or more, no change in effect is observed, so the upper limit was made 10%, but preferably 2% to 8% (mass).

According to this invention, since the powder of MoS ₂ is sprayed onto the sliding surface at a high pressure, the pressure resistance is remarkably improved as compared with the case where it is mixed with grease, paste or oil, and the sliding surface which has been difficult to apply conventionally. It has the effect of adhering to and exhibiting anti-friction properties.

  According to the present invention, it is easy to handle the lubricant, its usage is simple and easy, and there is an effect that a special skill level is not required.

In the present invention, if 5% of MoS ₂ powder (average particle size 10 μm) is mixed with 95% of high-pressure gas for injection (for example, LPG) and sprayed onto the sliding surface at a pressure of 0.3 MPa or more, 9 m ^{2 /} min. Can be sprayed.

  In the case where the sliding surface is cylindrical (for example, the inner surface of the cylinder), the nozzle inner surface can be evenly sprayed by providing a number of blowing holes in the circumferential direction at the tip of the nozzle. When the relatively narrow gap wall surface is a sliding surface, the object can be easily achieved by providing a large number of blowing holes on the side wall of the elongated nozzle and reciprocating the nozzle back and forth and left and right.

In a pressure-resistant container having a blowing nozzle, 5% (mass) of MoS ₂ having an average particle diameter of 10 μm and LPG 95% (mass) as high-pressure gas are accommodated.

In the above, when the valve attached to the nozzle is opened, MoS ₂ is blown out together with the high pressure gas from the nozzle, the nozzle is opposed to the sliding surface (for example, at an interval of 10 cm), and MoS ₂ pops out as the high pressure gas is blown out. Create a layer of MoS _{2 on} the surface.

  The powder having an average particle diameter of 10 μm is used as described above. However, even if it is a mixed powder having a powder diameter of 0.1 μm to 200 μm, there is no problem in effect.

  In the above embodiment, LPG is used, but any conventionally used liquefied gas can be used.

In a pressure-resistant container having a blowing nozzle, 5% (mass) of MoS ₂ having an average particle diameter of 10 μm, 5% (mass) of oil, 6% (mass) of an organic solvent, and 84 % (mass) of LPG as a high-pressure gas. Accommodate.

In the above, when the valve attached to the nozzle is opened, MoS ₂ is blown out together with the high pressure gas from the nozzle, the nozzle is opposed to the sliding surface (for example, at an interval of 10 cm), and MoS ₂ pops out as the high pressure gas is blown out. Create a layer of MoS _{2 on} the surface.

  The powder having an average particle diameter of 10 μm is used as described above. However, even if it is a mixed powder having a powder diameter of 0.1 μm to 200 μm, there is no problem in effect.

  In the above embodiment, LPG is used, but any conventionally used liquefied gas can be used.

  According to the above embodiment, the solvent other than the solid powder containing the liquid oil is instantly dried and attached to the object because it is only the liquefied high-pressure gas immediately after spraying.

  In addition, since it is in a sliding state when used, the powder, which is a fine powder containing a small amount of oil, is pressed and rubbed into the fine uneven surface of the surface of each material, and coating with good flatness It becomes a state.

  In the above example, spray application was applied from the plug hole of an automobile engine into a cylinder (using 15 to 20 cc with respect to a volume of 500 cc) and left for 20 hours to confirm the dry adhesion state, and then engine performance test using an engine dynamometer As shown below, improvements in pressure, torque, compression, etc. were observed over almost the entire area, and reductions in volume, exhaust gas CO, and HC were observed.

  According to the results of the experiment, the following effects were recognized.

  1. At horsepower 3000-7000rpm, increase up to 4.6PS (almost the whole area).

  2. Increase of 0.51 kg-m at the torque 3000 to 7000 rpm (almost the entire area).

  3. Volume Idling 3000-5000rpm Reduction of maximum 1.7dB (almost the whole area).

  4). Compression 3000-7000 rpm 0.1-0.2% increase (increased in all areas).

  5. CO: Usually 3 to 6 vol% → 2 to 5 vol% lower (average 19% lower).

      HC: Usually decreased from 410 to 610 ppm to 330 to 500 ppm (average 19% decrease).

Claims (2)

Molybdenum disulfide powder 1% to 10% (mass) with a particle size of 0.1 μm to 200 μm, 2% to 8% (mass) of oil that completely evaporates when heated, 2% to 8% of organic solvent % (by weight) and 95% (mass) were mixed liquefied high-pressure gas for injection to a maximum, a lubricating layer provided sprayed on the cylinder inner sliding surface the mixture above the pressure 0.3 MPa, the lubricating layer A method for producing a lubricating layer in a cylinder, characterized in that the product is dried. 1% to 10% (mass) of molybdenum disulfide powder having a particle size of 0.1 μm to 200 μm, 2% to 8% (mass) of an ester oil component of synthetic oil, 2% to 8% (mass) of an organic solvent, and liquefied high-pressure gas for injection to 95% (mass) and the upper limit and mixed with the mixture, a lubricating layer provided the mixture is sprayed into the cylinder inner sliding surface above the pressure 0.3 MPa, the lubricating layer A method for producing a lubricating layer in a cylinder characterized by drying.