JTEKT has developed "Non-recirculating Ball Screws" for Electro Mechanical Brake (EMB). EMB is a braking method that changes the drive source for pushing the disc brake piston from hydraulic to electric. It is suitable for electric vehicles such as electric vehicles (EV) and hybrid electric vehicles (HEV), which helps reduce vehicle weight, reduce CO2 emissions, and improve comfort.
R & D background
With the increasingly strict environmental protection requirements, the automotive industry is accelerating the transition to electrification and autonomous driving, and the electronic components are gradually replaced by hydraulic control.
Both EV and HEV use both regenerative and friction braking methods. Regenerative braking is a mechanism that decelerates by converting the rotational force of an electric motor into electrical energy. If this "energy regeneration" is fully utilized in friction braking control, the fuel efficiency of the car can be improved. The use of ball screws in friction brakes can further improve the efficiency of energy regeneration and thus improve braking performance.
New Product Features
The ball screw effectively converts the rotary motion of the motor into the linear motion of the brake piston. Generally, the ball screw has a circulation mechanism so that the ball will not fall off the track during the linear movement. Although there are various types of circulation mechanisms, each mechanism has the disadvantage of making the body larger by forming a circulation portion.
JTEKT focuses on the short distance of linear movement that must occur when braking with EMB, and has developed small balls that can continue to rotate by the spring inserted between the ball even if the circulation mechanism is eliminated. Lead screw.
In addition, the improvement of the lubricating oil prevents the problem of inefficiency caused by oil film rupture, thereby ensuring sufficient durability and achieving maintenance-free.
JTEKT has proposed the "Key of your operation" policy in the bearing business brand "Koyo". We will work with our customers to solve problems and contribute to all industries as partners who provide happiness.