Radial piston pump for pumping water

Claim 1

A radial piston pump for pumping water, comprising: means forming a closed chamber having a single fitting enabling the introduction of a lubricant into and draining of the lubricant from said chamber, said chamber having a pair of axially spaced end walls; a pump body peripherally surrounding said chamber and formed with at least one radially oriented piston-and-cylinder pumping unit having an intake valve at one axial side of said body and an outlet valve at an opposite axial side of said body; a pump housing having axially spaced end walls juxtaposed with said end walls of said chamber and said sides of said body, said end walls of said housing defining with said end walls of said chamber a pair of axially spaced gaps with one of said gaps communicating with said intake valve, said body being formed with a plurality of passages parallel to an axis of said chamber, communicating between said gaps and arrayed around said chamber, said housing being formed with a suction intake fitting communicating with said gaps and said passages for delivering water to said intake valve, whereby said water passes in heat exchanging relationship with said lubricant through said end walls and said periphery of said chamber; and a drive mechanism for said unit having a shaft extending axially into said chamber and provided within said chamber with means immersed in said lubricant for actuating said unit.