Robot joint having dynamic sealing structure and quadruped robot applying the same

A robot joint comprising:

• a power unit housing including a top surface;
• an output shaft rotatable relative to the power unit housing, the output shaft including a tubular wall and a circular end plate attached to the tubular wall to close an opening of the tubular wall, the circular end plate being parallel with the top surface of the power unit housing, the circular end plate of the output shaft and the top surface of the power unit being perpendicular to a rotational axis of the output shaft;
• and
• a dynamic sealing component provided between the power unit housing and the output shaft, wherein
• the dynamic sealing component comprises a first sealing ring and a second sealing ring abutting against each other and capable of maintaining relatively stationary and sealed;
• the friction coefficient of the first sealing ring is greater than the friction coefficient of the second sealing ring;
• the second sealing ring has a higher structural strength than the first sealing ring;
• one of the power unit housing and the output shaft directly or indirectly abuts against the first sealing ring, and the other is in direct or indirect sliding contact with the second sealing ring;
• the first sealing ring is deformed after being squeezed to produce a pre-tightening force, causing the dynamic sealing component to directly or indirectly abut against the power unit housing and the output shaft respectively to form the dynamic sealing structure used for sealing a joint and capable of maintaining the normal movement of the joint;
• and
• the first sealing ring and the second sealing ring are disposed in a space inside the cylindrical wall of the output shaft and parallel with the rotational axis of the output shaft.