| 摘要 |
<p>The present invention refers to a mechanical coolant pump 10 for an internal combustion engine. The pump 10 comprises a stationary cylindrical pump housing 12 with an interna! pneumatic actuator 13 which is supplied by a pneumatic supply means 15 supplying a low-pressure, i.e. a pressure below the atmospheric pressure. Further, the pump 10 comprises a pump wheel 18 rotatably fixed with a pump wheel shaft 20, whereby the pump wheel shaft 20 is rotatably supported by the pump housing 12. The pump wheel shaft 20 is connectable to a separate driven shaft 22 by an internal pneumatic clutch unit 11, whereby the driven shaft 22 is directly connected with a pulley-wheel 24 which is driven by a driving belt. The interna! clutch unit 11 comprises a ciutch disk 26 which is completely fixed to the driven shaft 22 or, alternatively, to the pump wheel shaft 20, and an axfaily slidable clutch disk 28 which is siidably arranged at the pump wheel shaft 20 or, alternatively, at the driven shaft 22. The slidable clutch disk 28 is rotatably fixed to the pump wheel shaft 20 or, alternatively, to the driven shaft 22 and is axia?y actuated by the pneumatic actuator 13.</p> |
