A lubricating grease composition, and more specifically, to a lubricating grease composition which, when used with an article clamping device, such as a chuck, produces excellent lubricating properties whilst remaining strongly adhered to metal parts in the clamping mechanism of the device and showing enhanced chemical and physical resistance to fluids such as cutting fluids with which they come into contact.

To provide a grease composition for a tapered roller bearing having superior bearing lifetime under a condition of high temperature and a condition of high load, and a tapered roller bearing in which the grease composition for the tapered roller bearing is filled. A tapered roller bearing 11 includes an inner ring 12 having a raceway surface 12a, an outer ring 13 having a raceway surface 13a and a plurality of tapered rollers 14, and a flange part of the inner ring 12 gets into sliding contact with the tapered rollers 14. Grease 16 is filled around the tapered rollers 14. The grease 16 includes a base oil, a thickener and an additive. A frequency in which a storage modulus, which varies depending on frequency, of the grease 16 becomes minimum is equal to 7 Hz or more.

To provide a grease composition for a tapered roller bearing having superior bearing lifetime under a condition of high temperature and a condition of high load, and a tapered roller bearing in which the grease composition for the tapered roller bearing is filled. A tapered roller bearing 11 includes an inner ring 12 having a raceway surface 12a, an outer ring 13 having a raceway surface 13a and a plurality of tapered rollers 14, and a flange part of the inner ring 12 gets into sliding contact with the tapered rollers 14. Grease 16 is filled around the tapered rollers 14. The grease 16 includes a base oil, a thickener and an additive. A frequency in which a storage modulus, which varies depending on frequency, of the grease 16 becomes minimum is equal to 7 Hz or more.

The present disclosure is related to provide a lubricating grease composition having a high static friction coefficient while maintaining excellent low-temperature torque characteristics, high-temperature shear stability, and high-temperature oil separation characteristics. A lubricating grease composition of the present disclosure contains a base oil, a thickener, and a solid lubricant, wherein the solid lubricant is calcium carbonate, the amount of the calcium carbonate blended is 1 to 60% by weight based on the total weight of the lubricating grease composition, the calcium carbonate has an average particle diameter of 0.1 to 30 m, the base oil has a kinematic viscosity of 18 to 300 mm.sup.2/s at 40 C., and the lubricating grease composition has a worked penetration of 240 to 320.

The present disclosure is related to provide a lubricating grease composition having a high static friction coefficient while maintaining excellent low-temperature torque characteristics, high-temperature shear stability, and high-temperature oil separation characteristics. A lubricating grease composition of the present disclosure contains a base oil, a thickener, and a solid lubricant, wherein the solid lubricant is calcium carbonate, the amount of the calcium carbonate blended is 1 to 60% by weight based on the total weight of the lubricating grease composition, the calcium carbonate has an average particle diameter of 0.1 to 30 m, the base oil has a kinematic viscosity of 18 to 300 mm.sup.2/s at 40 C., and the lubricating grease composition has a worked penetration of 240 to 320.

Natural liquid potassium soap compositions and methods of manufacturing and using the same are provided with thickening by the addition of chloride salts, such as sodium chloride and potassium chloride. The natural liquid potassium soap compositions may contain one or more fatty acids with carbon length ranging from four (C4) to twenty-two (C22) or natural fatty acid mixtures with coconut oil, olive oil, tallow, sunflower oil, safflower oil, and/or tall oil fatty acids which are saponified with lye. The saponification lye is preferably potassium hydroxide. Preferred embodiments contain potassium salts of fatty acids comprising at least oleic acid (C18:1 cis-9), olive oils, coconut oils or mixtures thereof. The chloride salt is added in either solid or liquid form following saponification and neutralization.

Natural liquid potassium soap compositions and methods of manufacturing and using the same are provided with thickening by the addition of chloride salts, such as sodium chloride and potassium chloride. The natural liquid potassium soap compositions may contain one or more fatty acids with carbon length ranging from four (C4) to twenty-two (C22) or natural fatty acid mixtures with coconut oil, olive oil, tallow, sunflower oil, safflower oil, and/or tall oil fatty acids which are saponified with lye. The saponification lye is preferably potassium hydroxide. Preferred embodiments contain potassium salts of fatty acids comprising at least oleic acid (C18:1 cis-9), olive oils, coconut oils or mixtures thereof. The chloride salt is added in either solid or liquid form following saponification and neutralization.

A silicone grease composition having high friction characteristics and wear characteristics is disclosed. The silicone grease composition is provided by adding a zinc salt (B) containing, at a mass ratio from 1:99 to 99:1, a zinc dialkyldithiophosphate (B1) and a zinc dialkyldithiocarbamate (B2) as an extreme-pressure additive to a silicone oil (A). A method for transmitting torque of a clutch or a torque limiter mechanism is also disclosed.

A silicone grease composition having high friction characteristics and wear characteristics is disclosed. The silicone grease composition is provided by adding a zinc salt (B) containing, at a mass ratio from 1:99 to 99:1, a zinc dialkyldithiophosphate (B1) and a zinc dialkyldithiocarbamate (B2) as an extreme-pressure additive to a silicone oil (A). A method for transmitting torque of a clutch or a torque limiter mechanism is also disclosed.

A grease composition comprises a base oil and an aluminium complex soap thickener, with graphite, molybdenum di-sulphide, calcium carbonate and bismuth sulphide all included as additives. The composition exhibits advantageous load, wear and friction performance, especially in extreme pressure environments, and is particularly suitable for use on open gears.