WO2020153318A1 - 走行することにより車体が帯電する車両用潤滑剤 - Google Patents
走行することにより車体が帯電する車両用潤滑剤 Download PDFInfo
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- WO2020153318A1 WO2020153318A1 PCT/JP2020/001824 JP2020001824W WO2020153318A1 WO 2020153318 A1 WO2020153318 A1 WO 2020153318A1 JP 2020001824 W JP2020001824 W JP 2020001824W WO 2020153318 A1 WO2020153318 A1 WO 2020153318A1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M115/00—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof
- C10M115/08—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
- C10M125/02—Carbon; Graphite
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M147/00—Lubricating compositions characterised by the additive being a macromolecular compound containing halogen
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M147/00—Lubricating compositions characterised by the additive being a macromolecular compound containing halogen
- C10M147/02—Monomer containing carbon, hydrogen and halogen only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M161/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/02—Mixtures of base-materials and thickeners
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
- F16C33/6633—Grease properties or compositions, e.g. rheological properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
- F16C33/6688—Lubricant compositions or properties, e.g. viscosity
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/04—Elements
- C10M2201/041—Carbon; Graphite; Carbon black
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/003—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/102—Aliphatic fractions
- C10M2203/1025—Aliphatic fractions used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/06—Perfluoro polymers
- C10M2213/062—Polytetrafluoroethylene [PTFE]
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/10—Amides of carbonic or haloformic acids
- C10M2215/102—Ureas; Semicarbazides; Allophanates
- C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/055—Particles related characteristics
- C10N2020/06—Particles of special shape or size
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/28—Anti-static
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/02—Bearings
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/10—Semi-solids; greasy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/02—Wheel hubs or castors
Definitions
- the present invention relates to a vehicle lubricant in which the vehicle body is charged by running.
- Patent Document 1 describes a control device of a current control type damping force variable damper for the purpose of achieving both steering stability and riding comfort.
- Patent Document 2 is a land that extends from the central portion in the tread width direction to the tread shoulder and has an inclined groove that inclines with respect to the tire circumferential direction to come in contact with the road surface for the purpose of ensuring sufficient drainage and steering stability.
- the tire formed in the section will be described.
- Patent Document 3 describes a driving wind guide structure for an automobile, which aims to improve driving stability and fuel efficiency by reliably suppressing the wind from being caught in the tire.
- Lubricants are used for various sliding parts such as power transmission part, steering mechanism part and shock absorbing part. Lubricants used for these applications usually contain additives.
- Patent Document 4 uses electrical components of automobiles, alternators and intermediate pulleys that are engine auxiliary machines, electromagnetic clutches for car air conditioners, water pumps, electromagnetic clutches for gas heat pumps, compressors, etc. under high temperature, high speed, and high load conditions.
- a grease composition containing a conductive substance such as carbon black in an amount of 0.1 to 10% by weight is described as a grease composition filled in a rolling bearing suitable for a portion where water is easily mixed.
- Tires can also affect steering stability (Patent Document 2).
- Patent Document 2 In general, in order to improve the steering stability, it is advantageous to increase the block area on the tread surface of the tire. However, if the block area on the tread surface of the tire is increased, the drainage property on the wet road surface may be deteriorated, and as a result, the steering stability on the wet road surface may be decreased.
- a member for improving aerodynamic characteristics such as the traveling wind guide structure of the automobile described in Patent Document 3 may cause an unfavorable effect such as an increase in weight due to the installation of the member, interference with the road surface, and deterioration in designability. There is.
- Patent Document 4 The grease composition described in Patent Document 4 is applied to automobile electrical components and the like. Patent Document 4 does not describe at all the relationship between the grease composition described in the document and the driving stability of automobiles and the like.
- an object of the present invention is to provide a lubricant that can improve the driving stability of an automobile or the like whose body is charged by running.
- the present inventors have studied various means for solving the above problems.
- the present inventors have made a lubricant in the form of a grease composition used for a rolling bearing, which is a sliding portion supporting an axle of an automobile or the like, contain an additive containing carbon black which is a conductive substance. It has been found that the steering stability of an automobile or the like in which the lubricant is applied to the sliding portion is remarkably improved.
- the present inventors have completed the present invention based on the above findings.
- the present invention includes the following aspects and embodiments.
- a kit for improving the steering stability of a vehicle which includes a discharge member having a protrusion that causes air-ionized self-discharge and the lubricant according to any one of the above embodiments (1) to (3).
- a method for improving the driving stability of a vehicle including the step of applying the lubricant according to any one of the above embodiments (1) to (3) to a sliding portion of the vehicle.
- the method according to the above-mentioned embodiment (5) further comprising the step of disposing a discharge member having protrusions for air-ionized self-discharge on a vehicle body of an automobile.
- a lubricant that can improve the driving stability of an automobile or the like in which the vehicle body is charged by running.
- FIG. 1 is a graph showing the steering angle during a lane change in a steering stability measurement test over time.
- FIG. 2 is a graph showing the values of vehicle yaw angular acceleration at a steering angle of 60°/sec in the test vehicles of Example 1 and Comparative Example 1.
- FIG. 3 is a graph showing changes over time in the electric potential of the fender liner during running in the test vehicles of Example 2 and Comparative Example 1.
- (A) shows the measurement results of the test vehicle of Comparative Example 1
- (b) shows the measurement results of the test vehicle of Example 2.
- the horizontal axis represents elapsed time (seconds) and the vertical axis represents potential (kV).
- Lubricant> The present inventors have made a lubricant in the form of a grease composition used for a rolling bearing, which is a sliding portion supporting an axle of an automobile or the like, contain an additive containing carbon black which is a conductive substance. , And found that the driving stability of automobiles and the like was remarkably improved. Therefore, one aspect of the present invention relates to a lubricant containing a base oil and an additive containing carbon black for improving steering stability of an automobile.
- each aspect of the present invention is not limited to the following operations and principles.
- a vehicle body of an automobile or the like is usually positively charged due to friction between a tire and a road surface caused by traveling, disturbance, and the like.
- air is usually positively charged. Therefore, when a car or the like travels, an electrostatic repulsive force is generated between the car body surface and the air, and a repulsive force is generated in the direction away from the car or the like with respect to the air flow near the car body surface.
- tires of automobiles and the like are usually positively charged due to contact with the road surface.
- the content of silica used in tires has been increasing due to the increasing demand for energy-saving tires.
- a tire having such a high silica content has a high tendency to be positively charged.
- an automobile or the like cannot obtain desired aerodynamic performance and/or running performance, and as a result, steering stability may be reduced.
- the lubricant of the present embodiment is applied to a sliding portion of an automobile or the like, for example, an axle rolling bearing, carbon black which is a conductive substance contained in the lubricant causes the surface of the vehicle body to pass through the sliding portion. And/or the positive charge on the tire can be removed. Therefore, the lubricant of the present embodiment can improve the driving stability of the automobile or the like through the removal of the charge on the surface of the vehicle body of the automobile or the like and/or the tire.
- the effect of removing the charge on the surface of the vehicle body such as an automobile and/or the tire is not limited, but for example, the lubricant or the kit of one aspect of the present invention may be used for a sliding part such as an axle.
- a test vehicle such as an automobile that has been applied to rolling bearings, and use a non-contact surface potential measuring device (for example, the positive and negative electrode surface potentials in the range of 0.1 to 5 kV can be measured) to test the running test vehicle. It can be quantitatively measured by measuring the change with time of the electric potential of the surface and/or the tire and comparing it with the measurement result of the control test vehicle.
- the driving stability of an automobile or the like mainly means the stability of the driving performance regarding steering among the basic driving performances of the automobile or the like such as "run, turn, stop".
- Steering stability of an automobile or the like includes, for example, followability and responsiveness of a vehicle such as an automobile when the driver actively steers the steering, and the steering of the automobile such as an automobile. It can be defined based on the course retention of the automobile or the like when not performing, and the convergence on external factors such as the road surface shape or cross wind.
- the steering stability of an automobile or the like is not limited, but for example, a test of an automobile or the like in which the lubricant or the kit of one aspect of the present invention is applied to a sliding portion, for example, an axle rolling bearing. It can be quantitatively measured by preparing a vehicle and evaluating the response of the test vehicle to the operation of the test vehicle.
- the steering of the test vehicle can be measured by the steering angle
- the responsiveness of the behavior of the test vehicle can be measured by the yaw angular acceleration of the vehicle.
- the steering angle can be measured by, for example, a vehicle-mounted rudder angle sensor or a controller area network (CAN) data logger.
- the vehicle yaw angular acceleration can be measured by, for example, a gyro sensor or the like.
- an automobile or the like means a vehicle having four wheels, two wheels, or any other number of rubber wheels (tires), and having a prime mover such as an engine or a motor.
- a prime mover such as an engine or a motor.
- the axle rolling bearing is a rolling bearing that supports an axle in an automobile or the like, and in the technical field, a wheel supporting rolling bearing device, an axle bearing, a hub unit, a hub bearing, a wheel hub bearing. It also means a member called a wheel bearing or the like.
- An axle rolling bearing usually has a structure in which a hub wheel for mounting a wheel of an automobile or the like is rotatably supported via a double row rolling bearing.
- the axle rolling bearing of an automobile or the like to which the lubricant according to one aspect of the present invention is applied is, for example, a double row angular contact ball bearing or a double row tapered roller bearing, if it is any bearing normally used in the technical field concerned. Good.
- the lubricant of this aspect can be applied to a sliding portion of an automobile or the like provided with a discharge member having a protrusion that causes air-ionized self-discharge, for example, an axle rolling bearing.
- the discharge member is preferably, but not limited to, an aluminum member (for example, an aluminum foil or an adhesive tape such as an aluminum tape or a conductive film tape) or a conductive coating.
- the base oil can be appropriately selected from various base oils such as mineral oil and synthetic oil commonly used in the technical field.
- the mineral oil contained in the lubricant of the present embodiment may be either paraffinic mineral oil or naphthene mineral oil, and is preferably paraffinic mineral oil.
- the mineral oil is, for example, appropriately combined with one or more optional refining means selected from vacuum distillation, oil deasphalting, solvent extraction, hydrocracking, solvent dewaxing, sulfuric acid washing, clay refining, hydrorefining and the like.
- the synthetic oil contained in the lubricant of the present embodiment is, for example, a hydrocarbon-based synthetic oil such as poly ⁇ -olefin oil starting from 1-decene or a cooligomer oil of ⁇ -olefin and ethylene, phenyl ether.
- a hydrocarbon-based synthetic oil such as poly ⁇ -olefin oil starting from 1-decene or a cooligomer oil of ⁇ -olefin and ethylene, phenyl ether.
- Any known synthetic oil such as synthetic oils, ester synthetic oils, polyglycol synthetic oils, and silicone oils may be used, and hydrocarbon synthetic oils containing only carbon and hydrogen atoms are preferable.
- the base oil may be composed of any of the mineral oils and synthetic oils exemplified above, or may be composed of a mixture of a plurality of mineral oils and/or synthetic oils.
- the base oil is preferably composed only of mineral oil. When the base oil consists of mineral oil only, the cost can be reduced.
- the lubricant of the present embodiment can exhibit desired fluidity when applied to a sliding portion, for example, an axle rolling bearing.
- the base oil preferably has a kinematic viscosity at 40° C. in the range of 40 to 200 mm 2 /s, more preferably 60 to 100 mm 2 /s. ..
- the kinematic viscosity of the base oil is less than the lower limit value, it is not possible to form a sufficient oil film in the sliding portion to which the lubricant of the present embodiment is applied, for example, the axle rolling bearing, and the rolling surface of the axle rolling bearing is not formed. Damage may occur.
- the lubricant of the present embodiment forms a sufficient oil film in the sliding portion to which the composition is applied, for example, an axle rolling bearing, to obtain a desired fluidity. Can develop sex.
- the kinematic viscosity of the base oil and the like is not limited, but can be measured based on JIS K2283 using, for example, a glass capillary viscometer.
- the additive carbon black can be appropriately selected from those having various forms usually used as a conductive material.
- the primary particle size of carbon black is preferably in the range of 1 to 100 nm, more preferably in the range of 5 to 50 nm.
- the content of carbon black is preferably in the range of 0.1 to 15% by mass, more preferably in the range of 0.5 to 10% by mass, and in the range of 2 to 8% by mass, based on the total mass of the lubricant. Is more preferable.
- the conductivity of the lubricant of the present embodiment is insufficient, and the surface of the vehicle body of the automobile or the like to which the lubricant is applied and/or the electrostatic charge of the tire is insufficiently removed.
- the content of carbon black exceeds the upper limit value, the fluidity of the lubricant of the present embodiment is reduced, and the lubricant is sufficiently contained in the sliding portion to which the lubricant of the present embodiment is applied, for example, an axle rolling bearing. May not reach. Therefore, by containing the carbon black having the above characteristics, the lubricant of the present embodiment can improve the steering stability of the automobile or the like when applied to a sliding portion of the automobile or the like, for example, an axle rolling bearing. it can.
- the additive preferably further contains polytetrafluoroethylene (PTFE).
- PTFE polytetrafluoroethylene
- the additive of the lubricant of the present aspect contains PTFE, thereby neutralizing the positive charge on the surface of the vehicle body such as an automobile to which the lubricant is applied and/or the tire, It is possible to remove the electrostatic charge on the surface of the vehicle body such as an automobile and/or the tire.
- the particle size of PTFE is not particularly limited.
- the average particle size in the particle size distribution of PTFE is preferably 0.5 to 50 ⁇ m, more preferably 1 to 15 ⁇ m.
- the PTFE content is preferably in the range of 0.1 to 15% by mass, more preferably in the range of 0.5 to 10% by mass, and in the range of 1 to 8% by mass, based on the total mass of the lubricant. It is more preferable that there is. If the content of PTFE is less than the lower limit value, there is a possibility that the surface of a vehicle such as an automobile to which the lubricant of the present embodiment is applied and/or the charge on the tire may be insufficiently removed.
- the lubricant of the present embodiment can further improve the steering stability of the automobile or the like when applied to sliding parts of the automobile or the like, for example, axle rolling bearings. it can.
- the lubricant of this aspect may optionally contain one or more further additives commonly used in the art.
- Further additives include, but are not limited to, solid additives other than carbon black and PTFE (such as molybdenum disulfide, graphite or melamine cyanurate (MCA)), extreme pressure agents (such as sulfurized olefins).
- the lubricant of this embodiment contains a further additive
- the further additive may be composed of any of the additives exemplified above, or may be composed of a mixture of a plurality of additives. ..
- the lubricant of this embodiment preferably further contains a thickener.
- the lubricant of this aspect can be in the form of a semi-solid or solid grease composition.
- the thickener can be appropriately selected from various materials such as soap-based materials and non-soap-based materials commonly used in the technical field. Examples of the soap-based material include lithium soap and the like.
- the non-soap-based material for example, in addition to an organic material such as a diurea compound or fluorine powder, an inorganic material such as silica powder, titania, alumina, or carbon fiber can be used.
- the diurea compound typically has the formula (I): Is a compound represented by.
- R 1 and R 2 are preferably, independently of each other, substituted or unsubstituted C 6 to C 20 alkyl or substituted or unsubstituted C 6 to C 18 aryl, and substituted or non-substituted.
- Substituted C 6 -C 18 aryl is more preferable, substituted or unsubstituted phenyl is still more preferable, and both R 1 and R 2 are particularly preferably 4-methylphenyl.
- a diurea compound represented by the above formula (I), wherein R 1 and R 2 are, independently of each other, a substituted or unsubstituted C 6 -C 18 aryl, is represented by “aromatic diurea”.
- aromatic diurea Sometimes referred to as "compound”.
- the thickener contained in the grease composition of the present embodiment is preferably a diurea compound or lithium soap, or a mixture thereof, more preferably a diurea compound, and further preferably an aromatic diurea compound. preferable. By containing the thickener having the above characteristics, the grease composition of the present embodiment can exhibit a high inflow property.
- the above thickener is preferably contained in the grease composition of the present embodiment in an amount such that the workability of the grease composition is in the range of 220 to 385.
- the workability is more preferably in the range of 265 to 340.
- the content of the thickener satisfying the above requirements is usually in the range of 2 to 30% by mass, typically in the range of 3 to 25% by mass, particularly 4 to 4% by mass based on the total mass of the grease composition. It is in the range of 20% by mass.
- the content of the thickener exceeds the upper limit value, there is a possibility that the grease composition may not be sufficiently spread in the sliding portion to which the grease composition of the present embodiment is applied, for example, the axle rolling bearing.
- the grease composition of the present embodiment may be excessively softened and may leak from a sliding portion, for example, an axle rolling bearing. Therefore, when the grease composition of the present embodiment contains a thickening agent having a miscibility of the above range, the grease composition of the present embodiment can have a desired composition without leaking from a sliding part to which the composition is applied, for example, an axle rolling bearing. Liquidity can be expressed.
- the penetration of the grease composition can be measured based on JIS K22207, for example.
- Lubricant manufacturing method> Another aspect of the present invention relates to a method for producing the lubricant of the one aspect of the present invention.
- the method of this embodiment is not particularly limited, and various methods can be applied.
- the method of the present embodiment includes a step of mixing a base oil and an additive containing carbon black (hereinafter, also referred to as “mixing step”).
- the mixing step is performed by mixing a base oil, an additive containing carbon black, and a thickener. Is preferred.
- the mixing step can be carried out by using a kneading means usually used in the technical field, such as a roll mill, a fryer mill, a Charlotte mill or a homogenizer.
- a kneading means usually used in the technical field, such as a roll mill, a fryer mill, a Charlotte mill or a homogenizer.
- the order of mixing the various components is not particularly limited.
- an additive containing carbon black and optionally a thickener may be added to the base oil at the same time and mixed, or added separately (for example, continuously or at predetermined intervals) and mixed. You may.
- Kit> Another aspect of the present invention relates to a kit for improving steering stability of a vehicle, which includes a discharge member having a protrusion that causes air-ionized self-discharge and the lubricant according to the aspect of the present invention.
- the discharge member may be the discharge member exemplified above with respect to the lubricant of one aspect of the present invention.
- the discharge member can be arranged on the vehicle body (for example, attached to a bumper, a wheel house, an undercover or the like) in an automobile or the like to which the kit of the present embodiment is applied.
- the kit of the present embodiment to an automobile or the like, in addition to the sliding portion of the automobile or the like, for example, an axle rolling bearing, the positive charge charged on the surface of the vehicle body and/or the tire via the discharging member is removed.
- the driving stability of the automobile or the like can be improved.
- Another aspect of the present invention relates to a method of improving steering stability of a vehicle.
- the method according to this aspect includes a step of applying the lubricant according to one aspect of the present invention to a sliding portion of an automobile (hereinafter, also referred to as “lubricant applying step”).
- the method of the present aspect can optionally further include a step of disposing a discharge member having protrusions for air-ionized self-discharging (hereinafter, also referred to as “discharging member disposing step”) on a vehicle body of an automobile.
- the lubricant application step is performed to remove the positive charge charged on the surface of the vehicle body and/or the tire through the sliding portion, for example, the axle rolling bearing, to improve the driving stability of the vehicle. Can be further improved.
- the discharge member arranging step as the discharge member having the projections for air-ionized self-discharge, the discharge member exemplified above with respect to the kit of one embodiment of the present invention can be applied.
- ⁇ I Preparation of lubricant> Base oil (paraffinic mineral oil, kinematic viscosity: 75 mm 2 /s (40°C)), thickener (reaction product of aromatic diurea compound, 4,4'-diphenylmethane diisocyanate and p-toluidine), carbon black (Primary particle size: 10 to 20 nm), polytetrafluoroethylene (PTFE, average particle size in particle size distribution: 5 ⁇ m), and other additives (antioxidant, rust inhibitor and antiwear agent) are added, The mixture was kneaded with three roll mills to prepare a lubricant in the form of the grease composition of Example 1 and Comparative Example 1. The structure of the aromatic diurea compound is shown below. Table 1 shows the content of each component in the lubricants of Example 1 and Comparative Example 1. In the table, the content of each component is shown as mass% with respect to the total mass of the lubricant.
- Lubricants in the form of the grease compositions of Example 1 and Comparative Example 1 were enclosed in an axle rolling bearing (JTEKT's hub unit having a double row angular contact ball bearing).
- the axle rolling bearings were mounted on the front and rear and left and right four wheels of the test vehicle.
- Table 2 shows the specifications of the test vehicle.
- Example 1 and Comparative Example 1 were run at a speed of 70 km/h. While driving, the lane change was repeated based on the steering method at the lane change shown in Fig. 1. In the steering method shown in FIG. 1, the change of the steering steering angle of 0° ⁇ -30° ⁇ 0° is carried out in 1 second (hereinafter, this change of the steering steering angle is referred to as “60°/second steering steering angle”). Also described).
- the steering wheel steering angle and the vehicle yaw angular acceleration of the test vehicles of Example 1 and Comparative Example 1 were measured. Steering The steering angle was measured by a steering angle sensor and a CAN data logger mounted on the vehicle. The vehicle yaw angular acceleration was measured by a gyro sensor (CROSSBOW NAV440CA-200).
- FIG. 2 shows the values of the vehicle yaw angular acceleration at the steering angle of 60°/sec in the test vehicles of Example 1 and Comparative Example 1.
- Example 1 As shown in FIG. 2, the value of the vehicle yaw angular acceleration of the test vehicle of Example 1 was significantly higher than that of the test vehicle of Comparative Example 1. From this result, it became clear that the use of the lubricant of Example 1 improved the responsiveness of the test vehicle to the steering of the test vehicle, and consequently improved the steering stability of the test vehicle.
- Example 2 [Measurement test of antistatic effect of car body]
- the content of the thickener is 3 mass%
- the content of carbon black is 5 mass%
- the content of PTFE is 10 mass%
- the content of other additives is 1.8 mass%
- the lubricant of Example 2 was prepared under the same conditions as above except that the content of the base oil was changed to the balance.
- a test vehicle was prepared using the lubricant of Example 2 under the same conditions as described above.
- test vehicles of Example 2 and Comparative Example 1 were run at a speed of about 100 km/h from the start. While traveling, use a non-contact surface potential measuring device (capable of measuring the surface potential of the positive and negative electrodes in the range of 0.1 to 5 kV) and the potential of the tire tread surface at the rear of the left rear wheel and the fender liner (on the tire tread surface). The electric potential of the facing parts) was measured.
- Figure 3 shows the changes over time in the fender liner potential.
- (a) shows the measurement results of the test vehicle of Comparative Example 1
- (b) shows the measurement results of the test vehicle of Example 2.
- the horizontal axis represents elapsed time (seconds) and the vertical axis represents potential (kV).
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
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Abstract
Description
(1) 基油と、カーボンブラックを含む添加剤とを含有する、自動車の操縦安定性を向上させるための潤滑剤。
(2) 前記添加剤が、ポリテトラフルオロエチレンをさらに含む、前記実施形態(1)に記載の潤滑剤。
(3) 増ちょう剤をさらに含有し、且つグリース組成物の形態である、前記実施形態(1)又は(2)に記載の潤滑剤。
(4) 空気イオン化自己放電する突起を有する放電部材と、前記実施形態(1)~(3)のいずれかに記載の潤滑剤とを含む、自動車の操縦安定性を向上させるためのキット。
(5) 自動車の摺動部に、前記実施形態(1)~(3)のいずれかに記載の潤滑剤を適用する工程
を含む、自動車の操縦安定性を向上させる方法。
(6) 自動車の車体に、空気イオン化自己放電する突起を有する放電部材を配置する工程をさらに含む、前記実施形態(5)に記載の方法。
(7) 前記摺動部が、車軸転がり軸受である、前記実施形態(5)又は(6)に記載の方法。
本発明者らは、自動車等の車軸を支持する摺動部である転がり軸受に用いられるグリース組成物の形態である潤滑剤に、導電性物質であるカーボンブラックを含む添加剤を含有させることにより、自動車等の操縦安定性が顕著に向上することを見出した。それ故、本発明の一態様は、基油と、カーボンブラックを含む添加剤とを含有する、自動車の操縦安定性を向上させるための潤滑剤に関する。
本発明の別の一態様は、本発明の一態様の潤滑剤の製造方法に関する。本態様の方法は、特に限定されず種々の方法を適用することができる。例えば、本態様の方法は、基油と、カーボンブラックを含む添加剤とを混合する工程(以下、「混合工程」とも記載する)を含む。
本発明の別の一態様は、空気イオン化自己放電する突起を有する放電部材と、本発明の一態様の潤滑剤とを含む、自動車の操縦安定性を向上させるためのキットに関する。
本発明の別の一態様は、自動車の操縦安定性を向上させる方法に関する。本態様の方法は、自動車の摺動部に、本発明の一態様の潤滑剤を適用する工程(以下、「潤滑剤適用工程」とも記載する)を含む。本態様の方法は、場合により、自動車の車体に、空気イオン化自己放電する突起を有する放電部材を配置する工程(以下、「放電部材配置工程」とも記載する)をさらに含むことができる。
基油(パラフィン系鉱油、動粘度:75 mm2/s(40℃))に、増ちょう剤(芳香族ジウレア化合物、4,4’-ジフェニルメタンジイソシアネート及びp-トルイジンの反応生成物)、カーボンブラック(一次粒径:10~20 nm)、ポリテトラフルオロエチレン(PTFE、粒度分布における平均粒径:5 μm)、及びその他の添加剤(酸化防止剤、錆止め剤及び耐摩耗剤)を加えて、3本のロールミルで混練して、実施例1及び比較例1のグリース組成物の形態である潤滑剤を調製した。芳香族ジウレア化合物の構造を下記に示す。実施例1及び比較例1の潤滑剤における各成分の含有量を表1に示す。表中、各成分の含有量は、潤滑剤の総質量に対する質量%として示す。
[混和ちょう度の測定試験]
実施例1及び比較例1のグリース組成物の形態である潤滑剤の混和ちょう度を、JIS K2220 7に基づき測定した。その結果、実施例1及び比較例1の潤滑剤の混和ちょう度は、いずれも300であった。
実施例1及び比較例1のグリース組成物の形態である潤滑剤を、車軸転がり軸受(JTEKT社製、複列アンギュラ玉軸受を有するハブユニット)に封入した。この車軸転がり軸受を、試験車両の前後及び左右の4輪に組み付けした。試験車両の仕様を表2に示す。
実施例1の潤滑剤において、増ちょう剤の含有量を3質量%、カーボンブラックの含有量を5質量%、PTFEの含有量を10質量%、その他の添加剤の含有量を1.8質量%、基油の含有量を残部に変更した他は前記と同様の条件で、実施例2の潤滑剤を調製した。実施例2の潤滑剤を用いて、前記と同様の条件で試験車両を準備した。
Claims (7)
- 基油と、カーボンブラックを含む添加剤とを含有する、自動車の操縦安定性を向上させるための潤滑剤。
- 前記添加剤が、ポリテトラフルオロエチレンをさらに含む、請求項1に記載の潤滑剤。
- 増ちょう剤をさらに含有し、且つグリース組成物の形態である、請求項1又は2に記載の潤滑剤。
- 空気イオン化自己放電する突起を有する放電部材と、請求項1~3のいずれか一項に記載の潤滑剤とを含む、自動車の操縦安定性を向上させるためのキット。
- 自動車の摺動部に、請求項1~3のいずれか一項に記載の潤滑剤を適用する工程
を含む、自動車の操縦安定性を向上させる方法。 - 自動車の車体に、空気イオン化自己放電する突起を有する放電部材を配置する工程をさらに含む、請求項5に記載の方法。
- 前記摺動部が、車軸転がり軸受である、請求項5又は6に記載の方法。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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BR112021012575-2A BR112021012575A2 (pt) | 2019-01-22 | 2020-01-21 | Lubrificante para veículo tendo o corpo de veículo carregado ao dirigir |
US17/425,141 US12031102B2 (en) | 2019-01-22 | 2020-01-21 | Lubricant for vehicle having vehicle body charged by driving |
KR1020217022814A KR102655924B1 (ko) | 2019-01-22 | 2020-01-21 | 주행함으로써 차체가 대전하는 차량용 윤활제 |
CN202080009657.8A CN113330100A (zh) | 2019-01-22 | 2020-01-21 | 伴随行驶而车身带电的车辆所用的润滑剂 |
EP20745725.0A EP3916075B1 (en) | 2019-01-22 | 2020-01-21 | Use of lubricant for a vehicle having the vehicle body charged by driving |
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JP2019-008170 | 2019-01-22 | ||
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JP2020004896A JP7295044B2 (ja) | 2019-01-22 | 2020-01-16 | 走行することにより車体が帯電する車両用潤滑剤 |
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- 2020-01-21 BR BR112021012575-2A patent/BR112021012575A2/pt unknown
- 2020-01-21 EP EP20745725.0A patent/EP3916075B1/en active Active
- 2020-01-21 WO PCT/JP2020/001824 patent/WO2020153318A1/ja active Application Filing
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BR112021012575A2 (pt) | 2021-09-08 |
EP3916075B1 (en) | 2023-11-29 |
EP3916075A4 (en) | 2022-03-23 |
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