Patent ID: 8202067

Claim:
An oil pump for a refrigerating compressor presenting a shell comprising in its interior: an oil reservoir containing lubricant oil and carrying a cylinder block affixing the stator of a motor provided with a rotor which rotates a crankshaft carrying, in a lower end; and an oil pump immersed in the lubricant oil, comprising: a tubular sleeve, having an upper portion affixed to at least one of the parts of crankshaft and rotor, so as to rotate therewith; a lower portion having a lower end immersed in the lubricant oil, said tubular sleeve being provided with an inner surface presenting, along at least part of its longitudinal extension, at least one helical groove upwardly extending from the lower end; and an elongated pump body, disposed in the interior of the tubular sleeve, maintaining a certain radial gap in relation to the latter and having an outer surface defining, with the adjacent helical groove of the tubular sleeve, a lubricant oil ascending channel, said pump body presenting a lower end portion projecting beyond the lower end of the tubular sleeve and mounting means mounting the lower end of said pump body to one of the parts of shell, cylinder block, and stator, so as to be freely displaced in the interior of the tubular sleeve, in radial directions orthogonal to the crankshaft and rotatively locked in relation to the rotor.