Patent ID: 9140151
Filing Date: 2015-09-22
Classification: F01L

Abstract:
1. A valve gear driving an engine valve of an internal combustion engine, comprising: a first camshaft rotatable around a rotation axis; a first cam piece driving the engine valve, the first cam piece being prohibited to rotate relative to the first camshaft; a second camshaft disposed inside the first camshaft, the second camshaft being rotatable around the rotation axis; a second cam piece driving the engine valve, the second cam piece being prohibited to rotate relative to the second camshaft; a housing; a first vane rotor housed in the housing, the first vane rotor being rotatable relative to the housing; and a second vane rotor housed in the housing, the second vane rotor being rotatable relative to the housing and the first vane rotor, wherein the first vane rotor is connected to one of the first camshaft and the second camshaft, being prohibited to rotate relative to the one, and wherein the second vane rotor is connected to the other one of the first camshaft and the second camshaft, being rotatable relative to the other one, the valve gear, further comprising: a first connecting member switching between a permission state and a prohibition state, wherein relative rotation between the first vane rotor and the second vane rotor or relative rotation between the housing and one of the first vane rotor and the second vane rotor is permitted in the permission state; and prohibited in the prohibition state, and a second connecting member switching between a permission state and a prohibition state, wherein relative rotation between the housing and the other one of the first vane rotor and the second vane rotor is permitted in the permission state and prohibited in the prohibition state.