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US5046460A Variable camshaft timing for internal combustion engine 失效
内燃机可变凸轮轴正时

Variable camshaft timing for internal combustion engine
摘要:
A variable camshaft timing arrangement for an internal combustion engine inhich a camshaft, for example, an intake valve operating camshaft in a dual camshaft engine, is advanced or retarded in its position relative to the crankshaft and to the exhaust valve operating camshaft in reaction to torque pulsations in such intake valve operating camshaft. In an engine having cam followers of the friction type, the unidirectionally acting torque on the camshaft which results from the friction between the camshaft and the followers can be offset by providing resilient means to act on one of the opposed cylinders to introduce a countertorque into the camshaft which is oppositely directed to the frictional torque.
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