A scroll-type displacement machine adapted to move a working fluid between a low-pressure environment and a high-pressure environment, the scroll-type displacement machine comprising: a housing ; a scroll pair comprising an orbiting scroll and a fixed scroll , said fixed and orbiting scrolls having respective spiral vanes which interfit with one another; Oldham ring means coupled to said fixed and orbiting scrolls for constraining said orbiting scroll against rotation but permitting said orbiting scroll to enjoy orbital motion about an axis of said fixed scroll ; a rotary drive shaft having a rotary axis and adapted for rotary motion about said rotary axis; bearing means supporting said rotary drive shaft within said housing and permitting said rotary drive shaft to enjoy rotary motion within said housing; eccentric drive bearing means positioned on said drive shaft adjacent said scroll pair and operatively coupled to said orbiting scroll such that rotation of said drive shaft corresponds with orbiting motion of said orbiting scroll; said housing enclosing at least said eccentric drive bearing means , at least a portion of said scroll pair , and at least a portion of said rotary shaft ; said fixed scroll having a low-pressure port located in a radially outer portion of the spiral vane thereof and communicating with said low-pressure environment; said orbiting scroll having a high-pressure port disposed at a radially central portion of the spiral vane thereof; and internal routing coupled to the high-pressure port resulting in said high-pressure environment being located in the interior of said housing, and characterized in that the high pressure port is positioned relative to said eccentric drive bearing means such that high pressure fluid passes directly from the high pressure port over said eccentric drive bearing means and from there through a flow path into said interior of said housing such that fluid flow serves to first pass over the drive bearing means and at least an adjacent surface of said orbiting scroll . a housing ; a scroll pair comprising an orbiting scroll and a fixed scroll , said fixed and orbiting scrolls having respective spiral vanes which interfit with one another; Oldham ring means coupled to said fixed and orbiting scrolls for constraining said orbiting scroll against rotation but permitting said orbiting scroll to enjoy orbital motion about an axis of said fixed scroll ; a rotary drive shaft having a rotary axis and adapted for rotary motion about said rotary axis; bearing means supporting said rotary drive shaft within said housing and permitting said rotary drive shaft to enjoy rotary motion within said housing; eccentric drive bearing means positioned on said drive shaft adjacent said scroll pair and operatively coupled to said orbiting scroll such that rotation of said drive shaft corresponds with orbiting motion of said orbiting scroll; said housing enclosing at least said eccentric drive bearing means , at least a portion of said scroll pair , and at least a portion of said rotary shaft ; said fixed scroll having a low-pressure port located in a radially outer portion of the spiral vane thereof and communicating with said low-pressure environment; said orbiting scroll having a high-pressure port disposed at a radially central portion of the spiral vane thereof; and internal routing coupled to the high-pressure port resulting in said high-pressure environment being located in the interior of said housing, and characterized in that the high pressure port is positioned relative to said eccentric drive bearing means such that high pressure fluid passes directly from the high pressure port over said eccentric drive bearing means and from there through a flow path into said interior of said housing such that fluid flow serves to first pass over the drive bearing means and at least an adjacent surface of said orbiting scroll . <EOS>