Patent ID: 7347186

Claim:
In an internal-combustion engine compression system for supplying a fuel under pressure to said internal-combustion engine, said compression system comprising: a high pressure pump ( 7 ) having a body ( 16 ) provided with an internal compartment ( 17 ) housing at least one pumping element ( 13 ) for providing a flow rate and a pressure to said fuel in an outlet pipe ( 20 ) and a mechanism ( 18 , 19 ) for operating said pumping element ( 13 ); and fuel-supply means ( 14 , 22 ) for delivering said fuel to said pumping element ( 13 ), said fuel-supply means ( 14 , 22 ) communicating with a fuel supply pipe ( 9 ) supplied by an external fuel supply source ( 2 ) through a low pressure pump ( 4 ) and a delivery pipe ( 8 ), said fuel-supply means comprising at least one inlet mouth ( 24 , 39 ) and an intake valve ( 14 ) located inside said body ( 16 ), another inlet mouth ( 26 ) supplied with said fuel directly from said delivery pipe ( 8 ) and fluidically connected to said internal compartment ( 17 ) to enable lubrication and/or cooling of a high pressure pump ( 7 ) with said fuel; wherein said pumping element ( 13 ) is provided with fluid-exhaust means ( 15 , 23 ) comprising an outlet mouth ( 25 , 40 ) and an exhaust valve ( 15 ) located inside said body ( 16 ) and connected to said outlet pipe ( 20 ) through a delivery pipe ( 31 ), a non-return valve ( 33 ) being set on a pipe ( 32 ) communicating with said other inlet mouth ( 26 ) to prevent recycling of said, fuel from said compartment ( 17 ) to said pumping element ( 13 ), the improvements characterized in that said other inlet mouth ( 26 ) and said non-return valve ( 33 ) are within said body ( 16 ) in series with a flow regulator ( 29 ′, 29 ″), said flow regulator ( 29 ′, 29 ″) having a fixed cross section sufficient for a flow of said fuel to lubricate and/or cool said compartment ( 17 ) and said mechanism ( 18 , 19 ), and regulating means ( 38 , 41 ) provides for regulating said pressure or flow rate of said fuel in said outlet pipe ( 20 ).