A lubricating grease composition for a resin member is used to be supplied as a lubricant on a surface of at least a sliding portion of a resin member including the sliding portion with an other member. The lubricating grease composition for a resin member contains a base oil which is a mixed oil of a poly--olefin having a kinetic viscosity at 40 C. of 18 to 50 mm.sup.2/s and an ethylene--olefin copolymer having a number average molecular weight of 40,000 to 200,000, a lithium-based complex soap as a thickener and a polytetrafluoroethylene resin as a solid lubricant having a mixing ratio of 4 to 12 mass % to the entire lubricating grease composition, wherein the base oil has a kinetic viscosity at 40 C. of 80 to 200 mm.sup.2/s and a worked penetration of the lubricating grease composition ranges from 265 to 340.

Disclosed herein are solid-liquid bi-phase lubricating devices that can include a cuboidal shaped stick with at-least one cylindrical or cuboidal shaped hollow core running through entire or partial length of the stick. The cuboidal shaped stick can include a solid polymer-based composite while the inner space is filled with a semi-fluid grease lubricant. The solid polymer-based composite can include one or more polymers, filler materials, corrosion inhibitors, plasticizers, and additives. The grease lubricant can include lithium, lithium-complex, aluminum-complex, calcium-sulphonate complex, bentone-thickened grease, and mixtures thereof and have an NLGI consistency grade1. The lubricating devices can be used for friction reduction of mechanical components involving two or more contacting surfaces in relative motion, such as a steel wheel flange-rail contact interface of transit and freight rail transport systems.

Disclosed herein are solid-liquid bi-phase lubricating devices that can include a cuboidal shaped stick with at-least one cylindrical or cuboidal shaped hollow core running through entire or partial length of the stick. The cuboidal shaped stick can include a solid polymer-based composite while the inner space is filled with a semi-fluid grease lubricant. The solid polymer-based composite can include one or more polymers, filler materials, corrosion inhibitors, plasticizers, and additives. The grease lubricant can include lithium, lithium-complex, aluminum-complex, calcium-sulphonate complex, bentone-thickened grease, and mixtures thereof and have an NLGI consistency grade1. The lubricating devices can be used for friction reduction of mechanical components involving two or more contacting surfaces in relative motion, such as a steel wheel flange-rail contact interface of transit and freight rail transport systems.

The presently claimed invention is directed to the use of carboxylic acid esters which are obtained by reacting aliphatic dicarboxylic acids and a mixture of structurally different monoalcohols having 10 carbon atoms as lubricants and a process for their preparation.

A method for reducing the friction coefficient of a lubricating oil composition in the lubrication of a mechanical device comprises formulating said lubricating oil composition with a carboxylic acid ester obtainable by reacting a mixture comprising at least on dicarboxylic acid and at least one branched C.sub.10 alcohol.

A lubricating grease for electric vehicle applications includes thickener 6% by weight (wt. %) to 12 wt. %, lubricating oil 57 wt. % to 92.98 wt. %, and surface-active ester 1 wt. % to 10 wt. %. The lubricating grease also includes additives including friction reducer and modifier 0.1 wt. % to 5 wt. %, anti-wear agent 0.1 wt. % to 5 wt. %, and a balance of extreme pressure agent, oxidation inhibitor, and corrosion inhibitor.

A lubricating grease for electric vehicle applications includes thickener 6% by weight (wt. %) to 12 wt. %, lubricating oil 57 wt. % to 92.98 wt. %, and surface-active ester 1 wt. % to 10 wt. %. The lubricating grease also includes additives including friction reducer and modifier 0.1 wt. % to 5 wt. %, anti-wear agent 0.1 wt. % to 5 wt. %, and a balance of extreme pressure agent, oxidation inhibitor, and corrosion inhibitor.

A lubricating grease for electric vehicle applications includes thickener 6% by weight (wt. %) to 12 wt. %, lubricating oil 57 wt. % to 92.98 wt. %, and surface-active ester 1 wt. % to 10 wt. %. The lubricating grease also includes additives including friction reducer and modifier 0.1 wt. % to 5 wt. %, anti-wear agent 0.1 wt. % to 5 wt. %, and a balance of extreme pressure agent, oxidation inhibitor, and corrosion inhibitor.

A lubricating grease for electric vehicle applications includes thickener 6% by weight (wt. %) to 12 wt. %, lubricating oil 57 wt. % to 92.98 wt. %, and surface-active ester 1 wt. % to 10 wt. %. The lubricating grease also includes additives including friction reducer and modifier 0.1 wt. % to 5 wt. %, anti-wear agent 0.1 wt. % to 5 wt. %, and a balance of extreme pressure agent, oxidation inhibitor, and corrosion inhibitor.