In commonly seen traffic accidents such as rear-end collisions, passengers are vulnerable to neck injuries. For this reason, active head restraints are seeing more popularity on the market. The ZHAOWEI gearbox for active head restraints (AHR) can greatly improve their effectiveness.
The design of modern cars attaches big importance to safety. Rear-end collisions account for a large proportion of traffic accidents, and most rear-end collisions cause neck injuries. Neck injuries in a low-speed rear-end collision can cause cervical spine injuries and long-term neck pain. Improving the anti-whiplash function of seat headrests has practical economic and societal significance.
The active head restraint (AHR) is a mechanical system. Within it, the upper cushion support is a pressure plate connected to the seatback through a connecting rod. When a car is rear-ended, the passenger’s body is impacted. First, the impact force hits the backrest and pushes the pressure plate back. The headrest is pushed forward to push the passenger’s head and neck, preventing or reducing the possibility of injury before the head and neck swing. The collision activation device is placed inside the headrest. When activated, the device moves the entire headrest upward using a metal support column to protect the head and neck of the passenger.
Electric Head Restraint Gearbox
Electric Head Restraint Gear Motor
ZHAOWEI Gear Motor for AHR
Drive System for Active Headrest
The headrest mechanism includes a control module, a drive motor, and a connecting drive mechanism. The control system and the drive motor interact using signals. The connecting drive mechanism includes an upper cross link mechanism arranged in parallel, a lower crosslink mechanism, and a drive screw connected to the motor. When a dangerous situation occurs, the control module uses a single-chip microcomputer or on-board computer to control the forward rotation of the motor. When the two nuts move toward each other, the head restraint is unfolded through the connecting drive mechanism. When dangerous conditions are eliminated, the control motor will reverse. The two nuts move backward, and the cushion mechanism folds the headrest.
The drive motor/gearbox must meet specific requirements. It must be quiet, reliable, start quickly, and have strong vibration resistance. All of these requirements can be met by the ZHAOWEI gearbox.
The AHR gearbox mentioned above has been developed for specific customers. It can also be customized according to customer requirements.