LUBRICATING CIRCUIT OF A HIGH-PRESSURE COMMON RAIL PUMP, AND HIGH-PRESSURE COMMON RAIL PUMP

摘要

A lubricating circuit of a high-pressure common rail pump (3) comprises: a support seat (24) for a portion (20b) of a shaft (20) of a high-pressure common rail pump (3), formed in a pump body (9) of the high-pressure common rail pump (3); a driving chamber (28), formed in the pump body (9) and fluidly connected to the support seat (24); a clearance (49), defined between coupling members (25, 27) of the shaft (20) and of the support seat (24) and communicating with the driving chamber (28); an inlet branch (40), for supplying a lubricating fluid to the support seat (24); an inlet passage (44), for fluidly connecting the inlet branch (40) to the support seat (24); and a fluidic passage (45) between the inlet passage (44) and the driving chamber (28), in parallel to the clearance (49). The circuit also comprises a concentrated load-drop element (50; 55) arranged along the fluidic passage (45).