| 摘要 |
A crank mechanism for an internal combustion engine comprises a cylinder (1), a piston (2) reciprocable within the cylinder, and a rotatable shaft (4). The piston (2) is in drivable connection with the shaft (4) via a connecting rod (3), a drive ring (5) and a torque lobe (6). The connecting rod (3) is pivotally fixed to the piston (2), and the drive ring (5) is rigidly attached to the free end of the connecting rod (3). The torque lobe (6) is a circular plate eccentrically mounted on the shaft (4) for rotation therewith about the axis thereof. The drive ring (5) is an annular sleeve which is a rotatable sliding fit around the rim of the torque lobe (6). The axis of the piston (2) is offset with respect to the centre of the output shaft (4), whereby rectilinear movement of the piston (2) is converted to rotary movement of the torque lobe (6) or vice versa.
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