| 摘要 |
<p>A rotary distributor type fuel pump has an annular cam ring (5) which is movable by a fluid pressure actuated piston (21) to control the timing of fuel delivery. The cylinder (22) containing the piston has an enlarged portion (25) in which is slidable a sleeve (27) located about the piston. The sleeve is engagable with the piston and one end is exposed to a fluid pressure applied to the piston to assist the movement of the piston when a valve (30) is set such that an annular space (29) is part defined by the other end of the sleeve, is connected to a drain. <IMAGE></p> |
