| 摘要 |
<p>The pump comprises a body formed by two elements (2, 3) sealingly clamped together, between which is defined a central chamber (5) in which a drive shaft (6) carrying an eccentric (7) is rotatably mounted. A plurality of cylinders (9) which open into the central chamber (5) of the body (2, 3) and are arranged radially around the shaft (6) is mounted in one element (2) of the body (2, 3), and pistons (13) which cooperate with the eccentric (7) are slidably mounted therein. These cylinders (9) are in communication with a supply chamber (18) defined in the body (2, 3) between the first and second elements (2, 3). The supply chamber (18) is annular in shape and is formed in a position radially outside the central chamber (5). At least one sealing member (31) for separating the supply chamber (18) from the central chamber (5) is interposed between the first and second elements (2, 3) of the body. At least one passage (50) is formed in one (3) of the elements (2, 3) of the body to put the supply chamber (18) into communication with the central chamber (5). An electrically-controlled device (51) is provided in this passage (50) and is adapted to control the flow of fluid through the passage (50) in a predetermined manner.</p> |
