| 摘要 |
A phase change mechanism is disclosed for enabling the phase of an engine camshaft to be changed in relation to the engine crankshaft. The mechanism comprises a drive member connectable for rotation with the engine crankshaft, a driven member connectable for rotation with the engine camshaft and two oppositely acting one-way clutches for transmitting torque from the drive member to the driven member. In the invention, either one of the one-way clutches may be selectively disengaged at a time by hydraulically lifting a roller of its ramp surface to allow the drive member to slip relative to the driven member under the action of the periodic reversal of the reaction torque of the camshaft during engine operation.
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