NSK developed a "wheel bearing with high-reliability sealing ring" that can achieve high reliability under severe conditions. The goal is to expand sales in the world market including emerging market countries, and strive to achieve 2016 Realize sales of 4 billion yen. A hub bearing is an assembly bearing that integrates a component mounted on a wheel and a component mounted on a vehicle body.

Seiko Co., Ltd. has been selling high-water-resistant “high-seal ring” bearings in emerging markets and other world markets. Hub bearings are usually mounted on the vehicle in the position closest to the road surface, and are easily stained with muddy water. They are also important parts supporting the vehicle body and therefore require high reliability.

Especially in Russia and other regions, there are unique bad road conditions due to the low-temperature environment. Snow, ice, frost, and mud on unpaved roads will continuously enter the hub bearings. Therefore, the ability of the hub bearings to resist mud is higher than that of high seals. Circle money. In addition, in emerging market countries, with the promotion of environmental protection initiatives in recent years, there are CO2 emission reduction requirements, and gasoline prices are also rising, and improving the fuel efficiency of automobiles has become a top priority. Therefore, wheel hub bearings are required to improve reliability while reducing friction. .

Japan Seiko added an auxiliary lip to the outside of the current main lip by changing the cross-sectional shape of the seal ring to prevent mud penetration and hinder lip movement. In this way, we achieved 1.5 times the original mud resistance. Since the space outside the accessory lip is narrower than the space outside the current primary lip, space for storing muddy water can be reduced, making it difficult for muddy water to accumulate.

Since the size of the new seal ring is controlled to the same degree as the original high seal ring, a highly reliable seal ring can be used without changing the size of the hub bearing. In addition, the surface pressure distribution of the lip of the seal ring was also optimized through computer analysis. Thus, after the auxiliary lip is added, the sliding friction of the entire seal ring will not be greatly increased. With the above improvements, the friction loss equivalent to that of the original hub bearing is achieved.