A radial permanent magnetic suspension bearing, comprising: a horizontal shaft (2), a support bearing (4), and a radial permanent magnet suspension bearing (3); the permanent magnetic suspension bearing (3) comprises a stator pull-push magnet (31) disposed on a stator casing (1) via a permeability magnetic substrate (322), and a rotor pull-push magnet (32) disposed on the horizontal shaft (2) correspondingly via an annular permeability magnetic substrate (322), having a radial gap and forming an axial pull-push magnetic circuit with the stator pull-push magnet (31); wherein the rotor pull-push magnet (32) consists of two or more annual permanent magnets axially and closely fitting, with magnetic poles alternately arranged in the axial direction; the stator pull-push magnet (31) consists of two or more annular permanent magnets axially and closely fitting, with magnetic poles alternately arranged in the axial direction, disposed over the horizontal panel where the axle center of the horizontal shaft (2) is located, and being symmetrical about the perpendicular bisection plane of the horizontal shaft. The bearing has a simple structure and greatly reduces energy consumption, without wear or bearing maintenance.

A method for regulating the physical properties of slide bearings during operation. The method controls the bearing modulus (Hersey number) s of a slide bearing and includes the steps of: (a) determining the temperature dependence of the dynamic viscosity of the bearing lubricant; (b) determining the mixed-film lubrication to hydrodynamic lubrication transition temperature of the bearing; (c) determining, on the basis of the temperature dependence of the dynamic viscosity of the lubricant, the temperature dependence of the bearing modulus (T) and the value of the bearing modulus .sub.cr of the mixed-film lubrication to hydrodynamic lubrication transition of the bearing; (d) measuring the operating temperature of the bearing; (e) regulating the value of the operating temperature of the bearing in order to keep the operating value of the bearing modulus .sub.perf close to .sub.cr in a range corresponding to the transition between mixed-film lubrication and hydrodynamic lubrication.

An example shaft, such as a crankshaft, has a coated wear sleeve disposed thereon. The coating on the wear sleeve provides tribological and/or mechanical benefits. The coating has a lower coefficient of kinetic friction than a conventional wear sleeve. The coating may further have a relatively high hardness. The coating may include a diamond like carbon (DLC) film or a metal-doped DLC (Me-DLC) film, such as tungsten (W)-doped DLC (W-DLC) film. The coating may be deposited on a bulk portion of the wear sleeve using physical vapor deposition (PVD) or similar processes. The coated wear sleeve is configured to engage and make contact with a static seal. The static seal includes elements that make contact with the coated wear sleeve while the shaft and coated wear sleeve rotate. The reduced friction, due to the coating, enhances the lifetime of the static seal.

A linear motion device includes a linear motion body that is fitted onto a screw shaft and moves straight along the screw shaft, a large number of balls held in a ball groove formed on an inner surface side of the linear motion body and rolling between the ball groove and the screw shaft, a separator interposed between each ball, a circulation passage formed in the linear motion body and circulating the ball from one end side of the ball groove to the other end side, where at least one of the separator and the circulation passage is formed from polyamide 410 by injection molding.

Gearboxes for aircraft gas turbine engines, in particular arrangements for journal bearings such gearboxes, and related methods of operating such gearboxes and gas turbine engines. A gearbox for an aircraft gas turbine engine includes: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.