| 摘要 |
A combined fuel and oil pump (11) comprises a reciprocating element (34) for pumping fuel according to its reciprocating movement, a reciprocating element (91) for pumping oil according to its reciprocating movement and a motor (13) operated by fluid pressure which is connected to the element (39) and the element (91) and is acted upon by a source for alternating relatively high and low pressures in order to cause the reciprocating movement of the element (39) and the element (91) at a frequency which is lower than the frequency with which the relatively high and low pressures alternate. <IMAGE>
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