Hydraulic valve mechanism with variable valve opening times and internal combustion engine

A hydraulic valve mechanism with variable valve opening times, the hydraulic valve mechanism comprising:

• a housing, provided with a first oil passage and a second oil passage;
• a valve cam, wherein the valve cam comprises a main protrusion and at least one auxiliary protrusion, the valve cam is rotatable, and the valve cam is disposed outside the housing;
• a hydraulic rotary valve, disposed in the housing and forming a hydraulic rotary valve oil chamber with the housing, wherein the hydraulic rotary valve comprises a valve sleeve and a valve core provided with an axial hole, the valve core is installed in an inner hole of the valve sleeve, the valve core and the valve sleeve rotate around a same axis and are provided with radial oil holes at corresponding axial positions respectively, when the radial oil holes of the valve core and the valve sleeve are in communication, the hydraulic rotary valve is in an open state, when the radial oil holes of the valve core and the valve sleeve are mutually staggered, the hydraulic rotary valve is in a closed state, the hydraulic rotary valve oil chamber is in communication with the first oil passage, and the axial hole of the valve core is in communication with the second oil passage;
• a hydraulic drive component, supported by the housing and forming a hydraulic drive oil chamber with the housing, wherein the hydraulic drive component is driven by the valve cam, and the hydraulic drive oil chamber is in communication with the first oil passage;
• and
• a valve drive component, supported by the housing and forming a valve drive oil chamber with the housing, wherein the valve drive oil chamber is in communication with the first oil passage, when the radial oil holes of the valve core and the valve sleeve are mutually staggered, the hydraulic rotary valve is in the closed state, and the hydraulic drive component drives the valve drive component to open a corresponding valve.