| 摘要 |
An internal combustion engine includes one or more pistons ( 4 ), each of which is mounted to reciprocate in a respective cylinder ( 2 ) and is pivotably connected to a connecting rod ( 6 ) which is connected to a respective crank on a crankshaft ( 7 ). The connecting rod ( 6 ) is pivotably connected to one end of an elongate link ( 14 ), which is pivotably connected to the associated crank at a point intermediate its ends and whose other end constitutes a rod ( 18 ) which is restrained by a mounting ( 20, 24 ) such that it may pivot about a pivotal axis parallel to the axis of the crankshaft. The mounting includes a first movable mounting member ( 20 ) and a second movable mounting member ( 24 ). The first mounting member ( 20 ) is connected to the rod ( 18 ) by a connection which permits only relative sliding movement in the direction of the length of the rod and is pivotally connected to the second mounting member ( 24 ) to pivot with respect thereto about the said pivotal axis. A single actuator ( 30 ) is provided which cooperates with the second mounting member ( 24 ) and is arranged to move it. The second mounting member ( 24 ) is an elongate lever which is connected to a fixed structure to pivot with respect thereto about an axis substantially parallel to the axis of crankshaft.
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