Dual-mode active rear-wheel steering device based on differential principle

A dual-mode active rear-wheel steering device, comprising:

• a housing assembly;
• a steering angle control motor;
• a speed-reduction mechanism;
• a differential mechanism assembly comprising a first half shaft and a second half shaft;
• a motion conversion mechanism;
• a first electromagnetic clutch;
• and
• a second electromagnetic clutch;
• wherein a housing of the steering angle control motor is fixedly provided at an end of the housing assembly;
• and the steering angle control motor is configured to drive rear wheels to steer and control a steering angle of the rear wheels;
• the speed-reduction mechanism is configured to perform deceleration and torque increase on an input torque of the steering angle control motor;
• the differential mechanism assembly is configured to transmit a motion input by the speed-reduction mechanism to the rear wheels;
• the first half shaft is configured to drive a rear wheel at a first side to steer;
• the second half shaft is configured to drive a rear wheel at a second side to steer;
• the motion conversion mechanism is configured to convert a rotation of the first half shaft and a rotation of the second half shaft into a linear motion of a steering tie rod to push the rear wheels to steer;
• the first electromagnetic clutch is arranged between the differential mechanism assembly and the speed-reduction mechanism;
• and the first electromagnetic clutch is configured to control connection between a differential housing of the differential mechanism assembly and the housing assembly;
• the second electromagnetic clutch is arranged at a side of the differential mechanism assembly away from the first electromagnetic clutch;
• and the second electromagnetic clutch is configured to control connection between the differential housing of the differential mechanism assembly and the second half shaft;
• and
• the first electromagnetic clutch and the second electromagnetic clutch are configured to be engaged or disengaged to control the first half shaft and the second half shaft to move in the same or opposite direction to drive the rear wheels to perform different steering operations.