| 摘要 |
A drive train for a four stroke, overhead cam engine is provided, comprising a crankshaft (14), connecting rod (72), and piston (70) assembly for reciprocating the piston within the cylinder bore of a cylinder block (32). An internally profiled cam gear (80) is driven around an axis perpendicular to the axis of the cylinder. A pair of follower arms (100, 102, 104) extend from a pair of rocker arms and engage the cam profile (96) to actuate intake and exhaust valves (51, 53) in the cylinder block. An intermediate gear (86) is driven by the crankshaft at half speed to drive the cam gear, and may also be used to drive an additional device, such as a combination oil pump and governor (130). The cam follower arms (102, 104) may be disposed in an overlapping crosswise arrangement generally parallel to the cam gear, or may be disposed perpendicular to the cam gear. <IMAGE> |
