| 摘要 |
A new and unique valve actuating cam shaft driving system for rotating a cam shaft to actuate suction and exhaust valves of an internal combustion engine, which comprises a driving gear on a crankshaft, a shock absorbing gear assembly rotatably mounted on an intermediate shaft and a plurality of power transmission gears, said shock absorbing gear assembly including two gears, one of them meshing with the driving gear while the other one meshing with one of the power transmission gears. The shock absorbing gear assembly has a shock absorbing member incorporated therein for preventing any vibration or shock from being transmitted to the valve actuating cam shaft. Further, one of the power transmission gears which is rotatably mounted on the cam shaft has a shock absorbing member incorporated therein in the same manner as that in the shock absorbing gear assembly. The shock absorbing member is press fitted into a space as defined by a pair of coaxially arranged inner and outer rings and its inner and outer circumferences are fixedly secured to the rings by way of a suitable thermal treatment.
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