| 摘要 |
An actuator for axial displacement of a gas exchange valve of a combustion engine is configured to be connected to a pressure fluid source and a pressure fluid sink, respectively, and to be driven by a gaseous pressure fluid and includes an actuator piston including an actuator piston disc and an actuator piston rod projecting therefrom in the axial direction, a cylinder volume, the disc separating the cylinder volume into a first part and a second part and being displaceable back and forth in the axial direction in the cylinder volume between an inactive position and an active position, the first part being configured for controllable fluid communication with the pressure fluid source and the pressure fluid sink, respectively, and a hydraulic circuit includes a chamber, the free end of the rod being arranged therein, wherein the rod is displaceable back and forth in the axial direction in a channel. |
| 主权项 |
1. A gas exchange valve actuator for axial displacement of a gas exchange valve of a combustion engine, the actuator (1) being configured to be connected to a pressure fluid source (HP) and a pressure fluid sink (LP), respectively, and is configured to be driven by a gaseous pressure fluid and comprises:
an actuator piston (8) comprising an actuator piston disc (4) and an actuator piston rod (7) projecting from the actuator piston disc (4) in the axial direction, a cylinder volume, the actuator piston disc (4) separating said cylinder volume in a first part (5) and a second part (6) and being displaceable back and forth in the axial direction in said cylinder volume between an inactive position and an active position, the first part (5) of the cylinder volume being configured for controllable fluid communication with said pressure fluid source (HP) and said pressure fluid sin (LP), respectively, and the actuator piston (8) being biased in the direction from the second part (6) of the cylinder volume towards the first part (5) of the cylinder volume, and a hydraulic circuit comprises a chamber (18), the free end (19) of the actuator piston rod (7) being arranged in said chamber (18),wherein the actuator piston rod (7) is displaceable back and forth in the axial direction in a channel (10) in connection with axial displacement of the actuator piston disc (4) in the cylinder volume, said channel (10) extending between the first part (5) of the cylinder volume and the chamber (18) of the hydraulic circuit, and wherein said channel (10) comprises at least one circumferential ventilation groove (22) that is configured to be connected to said pressure fluid sink (LP). |
