Abstract:
A piston ring comprises a generally annular ring body with a series of slots spaced circumferentially about an outer periphery of the ring body, each of the slots extending radially inwardly from the outer periphery. A hinge point is formed between adjacent slots, the hinge point corresponding to the outer periphery of the ring body. A wear surface material comprising ceramics is inlayed into each of the slots. The piston ring is formed by cutting a series of slots such as scallops about the outer periphery of the ring body that extend radially inwardly from the outer periphery and inlaying a wear surface material into the slots. The inlaying step may comprise the further step of thermally spraying the material into the slots. Then the outer periphery of the ring body may be ground to expose the wear surface material and create a finished outer surface.
Abstract:
A rotary vane compressor comprises a cylinder having two closed ends defining a cylinder chamber in which is rotatably mounted a rotor. The rotor carries a plurality of radially movable vanes which move radially into sliding contact with the inner surface of the cylinder chamber during rotation of the rotor to compress a refrigerant gas. The rotor is rotationally driven by a rotor shaft rotatably mounted by bearings in the cylinder ends. To prevent destruction of the ozone layer, a refrigerant containing no chlorine, such as HFC-134a (1,1,1,2-tetrafluoroethane; CH.sub.2 FCF.sub.3) is used, and to compensate for the inferior lubricating properties of the chlorine-free refrigerant, the bearings are provided with a manganese phosphate coating of 10 .mu.m-15 .mu.m thickness to prevent cohesion and seizure of the mutually contacting surfaces of the bearings and rotor shaft.
Abstract:
The crankshaft of an engine is supported by bearing caps mounted on journal walls of a cylinder block and a bridge interconnects the bearing caps. Oil passages in each bearing cap lead from the bridge to each crankshaft journal bearing at a laterally offset location rather than on the cylinder axis. A longitudinal main gallery in the bridge supplies oil to the passages and is laterally offset even further to that side. A supply passage in the bridge and one bearing cap at one extreme lateral side supplies oil from a pressurized oil supply passage in the cylinder block to that supply passage in the bearing cap.