New Product Info
NSK High-Performance Sealing Hub Unit Bearing(Feb 03,2012)
Tokyo, Japan, January 17, 2012 – NSK Ltd. (NSK; Headquarters: Tokyo, Japan; President and CEO: Norio Otsuka) today announced that it has developed a high-performance sealing hub unit bearing*1 that achieves high reliability under harsh environmental conditions as well as lower friction loss. NSK aims to grow worldwide sales of the new hub unit bearings, starting in emerging markets, and targets annual sales of 3 billion yen by 2015.
* A hub unit is a part that integrates the bearing with the hub on which automobile wheels are mounted.
The hub unit bearing is a critical mainstay component located in the center of the wheel, supporting the vehicle frame, so it must be extremely reliable. The hub unit bearing is exposed to harsh environmental conditions such as mud, sand and water, as the vehicles are used on unpaved roads, flooded roads often seen in emerging markets, and snow-covered roads in colder climates.
In addition, as demand to reduce CO2 emissions has increased and as gasoline prices have risen in recent years, it has become imperative to improve the fuel economy of automobiles. One of the ways this issue is being addressed is by reducing the friction of all rotating parts, from the engine to the wheels, in an effort to reduce the overall running resistance of the rotating parts of the vehicle.
Installation of seals into both the inboard and outboard sides of the bearing is a common means of protecting the bearing interior from contamination. However, the concern with this approach is higher friction due to rub caused by the seals. As an alternative method already used in the market, a metal cap is installed on the inboard side of the bearing, but this makes it difficult to obtain sufficient sealing performance. Another difficulty of this method is the accuracy of wheel rotational speed measurement caused by the position of the metal cap between the wheel speed sensor and magnetic encoder.
Solving all of these problems, NSK has developed a nonmagnetic metallic cap with a vulcanized rubber nose gasket. Building on this technology, NSK went on to develop a high- performance sealing hub unit bearing that achieves both reliability and low-friction loss.
Product features
Improved reliability in harsh environmental conditions
The nonmagnetic metallic cap with a vulcanized rubber nose gasket on the fitting surface ensures high–performance sealing. In fact, it achieves seven times the conventional level of sealing performance, and will reliably prevent the intrusion of contaminants such as mud, snow and dirt into the bearing.
Bearing can be made more compact thanks to application of high-magnetic force encoder
By making use of a high-magnetic force encoder, which has 20% higher magnetic flux density than conventional encoders, it becomes possible to detect the rotational speed through the cap. This makes it possible to make the bearing even more compact by avoiding the need to increase the size of the magnetic encoder due to the increase in clearance (gap) between the magnetic encoder and wheel speed sensor.
Limiting friction loss
Improved sealing performance and reduced running resistance is achieved through the use of low-friction technology on the outboard side seal and the use of the cap on the inboard side.
High-Performance Sealing Hub Unit Bearing
Sealing Performance of the Hub Unit Bearing (Air Leak Test Results)
Wheel Speed Sensing Using the High-Performance Sealing Hub Unit Bearing
Tokyo, Japan, January 17, 2012 – NSK Ltd. (NSK; Headquarters: Tokyo, Japan; President and CEO: Norio Otsuka) today announced that it has developed a high-performance sealing hub unit bearing*1 that achieves high reliability under harsh environmental conditions as well as lower friction loss. NSK aims to grow worldwide sales of the new hub unit bearings, starting in emerging markets, and targets annual sales of 3 billion yen by 2015.
* A hub unit is a part that integrates the bearing with the hub on which automobile wheels are mounted.
The hub unit bearing is a critical mainstay component located in the center of the wheel, supporting the vehicle frame, so it must be extremely reliable. The hub unit bearing is exposed to harsh environmental conditions such as mud, sand and water, as the vehicles are used on unpaved roads, flooded roads often seen in emerging markets, and snow-covered roads in colder climates.
In addition, as demand to reduce CO2 emissions has increased and as gasoline prices have risen in recent years, it has become imperative to improve the fuel economy of automobiles. One of the ways this issue is being addressed is by reducing the friction of all rotating parts, from the engine to the wheels, in an effort to reduce the overall running resistance of the rotating parts of the vehicle.
Installation of seals into both the inboard and outboard sides of the bearing is a common means of protecting the bearing interior from contamination. However, the concern with this approach is higher friction due to rub caused by the seals. As an alternative method already used in the market, a metal cap is installed on the inboard side of the bearing, but this makes it difficult to obtain sufficient sealing performance. Another difficulty of this method is the accuracy of wheel rotational speed measurement caused by the position of the metal cap between the wheel speed sensor and magnetic encoder.
Solving all of these problems, NSK has developed a nonmagnetic metallic cap with a vulcanized rubber nose gasket. Building on this technology, NSK went on to develop a high- performance sealing hub unit bearing that achieves both reliability and low-friction loss.
Product features
Improved reliability in harsh environmental conditions
The nonmagnetic metallic cap with a vulcanized rubber nose gasket on the fitting surface ensures high–performance sealing. In fact, it achieves seven times the conventional level of sealing performance, and will reliably prevent the intrusion of contaminants such as mud, snow and dirt into the bearing.
Bearing can be made more compact thanks to application of high-magnetic force encoder
By making use of a high-magnetic force encoder, which has 20% higher magnetic flux density than conventional encoders, it becomes possible to detect the rotational speed through the cap. This makes it possible to make the bearing even more compact by avoiding the need to increase the size of the magnetic encoder due to the increase in clearance (gap) between the magnetic encoder and wheel speed sensor.
Limiting friction loss
Improved sealing performance and reduced running resistance is achieved through the use of low-friction technology on the outboard side seal and the use of the cap on the inboard side.
High-Performance Sealing Hub Unit Bearing
Sealing Performance of the Hub Unit Bearing (Air Leak Test Results)
Wheel Speed Sensing Using the High-Performance Sealing Hub Unit Bearing
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