| 摘要 |
Here is disclosed a cam mechanism with a decompression device formed as a decompression cam by integrating a centrifugal weight and a decompression cam lobe. In a camshaft 20 which is driven to rotate in conjunction with a crankshaft and includes an intake cam 22, an exhaust cam 23 and a guide part 24, a groove portion 23b is formed at an opposite portion in the exhaust cam 23 to a cam lobe 23a, and a shaft receiving hole 24a is formed at a portion facing the groove portion 23b, in the guide part 24. On the other hand, a decompression cam 30 is formed by preparing a cylindrical shaft part 31, forming a decompression cam lobe 24 at one end of the shaft part 31, and forming a centrifugal weight part 32 at the other end thereof, and disposed on the camshaft 20 by inserting the decompression cam lobe 34 into the groove portion 23b, and pivotally supporting the shaft part 31 by the shaft receiving hole 24a. Thereafter, a flange member 41 is pressed onto the camshaft 20 outside the decompression cam 30 to be fixed, thereby constructing a cam mechanism 10 with a decompression device.
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