An unusual kind of wear between machine parts in sliding contact, traceable to environment, is greatly reduced by constituting at least one of the parts of a preferred steel alloy casting consisting essentially of In a specific embodiment, the part is the cam ring of a vane pump obtained by casting the alloy as a centrifugal tube and cutting ring blanks from the end of the tube.
A bearing to be used in an internal combustion engine, comprises a base and an overlay layer formed on said base. The overlay layer comprises an alloy layer consisting of from 5 to 20%, preferably from 10 to 14%, of Sn, from 0.05 to 10%, preferably from 0.5 to 5%, of at least one element selected from the group consisting of In and Tl, from 0.05 to 5%, preferably from 0.2 to 2%, of at least one, wear resistance-enhancing element selected from the group consisting of Sb, Mn, Bi, Ni, Cu, Ca and Ba, and Pb and impurities in balance, all percentages being by weight. The bearing is satisfactorily reliable when used in recent internal combustion engines, wherein the output of the engines tends to be high, and further, the oil drain interval tends to be long. The plating of layers and diffusion between these layers are conducted to produce a bearing which is reliable when used in the recent internal combustion engines.
A bearing to be used in an internal combustion engine, comprises a base and an overlay layer formed on said base. The overlay layer comprises an alloy layer consisting of from 5 to 20%, preferably from 10 to 14%, of Sn, from 0.05 to 10%, preferably from 0.5 to 5%, of at least one element selected from the group consisting of In and Tl, from 0.05 to 5%, preferably from 0.2 to 2%, of at least one, wear resistance-enhancing element selected from the group consisting of Sb, Mn, Bi, Ni, Cu, Ca and Ba, and Pb and impurities in balance, all percentages being by weight. The bearing is satisfactorily reliable when used in recent internal combustion engines, wherein the output of the engines tends to be high, and further, the oil drain interval tends to be long. The plating of layers and diffusion between these layers are conducted to produce a bearing which is reliable when used in the recent internal combustion engines.
A fluid pressure device of the axial plunger type including a housing, a rotatable shaft within the housing, a rotatable cylinder block operatively connected to the shaft and having a plurality of axial bores, plungers slidably mounted, respectively, within the bores, a valve plate located in abutment with an end surface of the cylinder block and having inlet and outlet ports which communicate successively with the bores as the cylinder block rotates, a swash plate pivotally supported upon the housing and operatively connected to the plungers for causing the plungers to reciprocate, and plunger shoes positioned between the plungers and the swash plate, the shoes being made of either a high tensile aluminum alloy, titanium, or a high tensile titanium alloy and comprising a slidable bearing surface made of a high load-bearing alloy which is adapted to bear against a planar surface of the swash plate.
A problem with hydraulic displacement units of the axial piston type is the cavitation which occurs at the porting face of the cylinder block due to the conventional use of a bearing material which, because of its very nature, has a tendency to erode. A solution to this problem is provided by a hydraulic axial displacement pump or motor which comprises a housing (10), a rotatable cylinder block (18) in the housing (10) and including a plurality of bores (30), a piston (35) in each of the bores (30) and reciprocable therein upon rotation of the cylinder block (18), a valve member (12) having inlet and outlet ports (34) and in abutment with the cylinder block (18) wherein each of the bores (30) has a port (31) opening to the ports (34) in the valve member (12) to establish fluid communication therewith, and a porting face (63) on the cylinder block (18) about the ports to the bores (30) and abutting the valve member or endcap (12) formed of a hard, erosion resistant material, and at least one stabilization foot (65) extending from the cylinder block (18) toward the valve member (12) and formed of a bearing material. This configuration results in a pump or motor which avoids cavitation caused erosion in the porting face which in turn results in a longer life and more efficient operation of the pump or motor.
