Mechanical backstop

A mechanical backstop, comprises a housing, an input impact gear, a frictional plate, a floating impact gear, and an output impact gear, wherein the floating impact gear is movably mounted between the input impact gear and the output impact gear to achieve transmission;

• the frictional plate is fixed relative to the housing and disposed at a side of the floating impact gear close to the input impact gear;
• when the input impact gear transmits a torque to the floating impact gear, the floating impact gear floats toward the output impact gear to separate from the frictional plate and transmit the torque to the output impact gear,
• when the output impact gear transmits a torque to the floating impact gear, the floating impact gear floats toward the input impact gear to abut against the frictional plate and achieve reverse locking, wherein
• an elastic piece is disposed inside the housing, and the elastic piece is used to produce an elastic acting force for moving the floating impact gear toward the frictional plate, and
• the elastic piece is a thrust spring, and the thrust spring is disposed in a mounting chamber in the housing;
• an end of the thrust spring is connected with an inner wall of the mounting chamber and the other end of the thrust spring is connected with an end of the floating impact gear adjacent to the output impact gear.