A device and method for dispensing a friction-coefficient-optimizing mixture of at least one lubricant and at least one grit into the gap between a rail wheel of a rail vehicle and a rail. The device includes a reservoir for the lubricant, a reservoir for the grit, a metering unit for metering the lubricant, a metering unit for metering the grit, a delivery apparatus for delivering the lubricant, a delivery apparatus for delivering the grit, and a common dispensing nozzle. The apparatus for delivering the lubricant and the apparatus for delivering the grit are separate from each other and end in the common dispensing nozzle, the friction-coefficient-optimizing mixture therefore not being formed until the dispensing, and an additional compressed air line is provided, which ends in the common dispensing nozzle.

A device and method for dispensing a friction-coefficient-optimizing mixture of at least one lubricant and at least one grit into the gap between a rail wheel of a rail vehicle and a rail. The device includes a reservoir for the lubricant, a reservoir for the grit, a metering unit for metering the lubricant, a metering unit for metering the grit, a delivery apparatus for delivering the lubricant, a delivery apparatus for delivering the grit, and a common dispensing nozzle. The apparatus for delivering the lubricant and the apparatus for delivering the grit are separate from each other and end in the common dispensing nozzle, the friction-coefficient-optimizing mixture therefore not being formed until the dispensing, and an additional compressed air line is provided, which ends in the common dispensing nozzle.

A vacuum pump may include a rotor and a stator, wherein the rotor is supported by metal bearings (such as steel bearings) to allow relative rotation of the rotor with respect to the stator. A liquid PFPE lubricant compound is provided to lubricate the bearings, wherein the lubricant further comprises a solid lubricant that is in suspension in the liquid lubricant. The solid lubricant can comprise any of graphite, graphene and molybdenum disulphide. In other words, the inventive concept encompasses a lubricated bearing arranged to support a rotating shaft in a body under sub-atmospheric conditions, wherein a lubricant used to lubricate the bearing comprises liquid PFPE lubricant having a low vapour pressure, and a solid lubricant that is held in suspension in the liquid lubricant. The solid lubricant may comprise any of graphite, graphene and molybdenum disulphide.

A vacuum pump may include a rotor and a stator, wherein the rotor is supported by metal bearings (such as steel bearings) to allow relative rotation of the rotor with respect to the stator. A liquid PFPE lubricant compound is provided to lubricate the bearings, wherein the lubricant further comprises a solid lubricant that is in suspension in the liquid lubricant. The solid lubricant can comprise any of graphite, graphene and molybdenum disulphide. In other words, the inventive concept encompasses a lubricated bearing arranged to support a rotating shaft in a body under sub-atmospheric conditions, wherein a lubricant used to lubricate the bearing comprises liquid PFPE lubricant having a low vapour pressure, and a solid lubricant that is held in suspension in the liquid lubricant. The solid lubricant may comprise any of graphite, graphene and molybdenum disulphide.