FAG Axial Drive Wheel Bearing Reaches Production (Pic)
Resource from: CBCC Likes:2956
Oct 08,2008
Schaeffler Group's (Germany) FAG Bearing has introduced a different drive arrangement for wheel bearing hub assembly units, and it will be finding its way onto a production vehicle.
Traditionally, the mechanical connection for driven wheels is via an axle with CV joints at each end. The outboard CV joint is splined and slides through a matching broached hole through the wheel bearing spindle. The CV joint and hub assembly are held in place by an axle nut through the end of the CV joint.
FAG points out that the traditional drive arrangement has its faults; there must be clearance to allow the CV joint to slide into the wheel bearing unit. Under day-to-day loads and use, but especially in high horsepower situations with high torque loading and tire friction, those splined areas can be stressed and loosen or fail. Even if they don't fail, over time the wear can cause driveline lash, felt inside the vehicle as harshness and/or vibration. In extreme cases, the splines or bearings can fail.
Reducing the radial clearance to zero in that arrangement is complex and expensive.
FAG's arrangement puts axial splines (essentially gear teeth) on the back side of the hub assembly unit. Matching axial gear teeth are formed on the end of the CV joint, and the whole unit is held in place with a long bolt.
Rather than machine the area as with traditional gear teeth, FAG uses high-precision orbital cold forming.
FAG claims that extensive testing shows the axial spline arrangement allows higher torque transmission than the traditional splined CV method, primarily because the gear teeth operate on a much larger pitch circle.
Orbital forming originally got a foothold at FAG because it allows undriven wheel hub units to be assembled without the traditional interior hub and nut holding the unit together. Instead, the inner is orbitally fixed. FAG has been expanding the use of orbital forming since the late 1980's.
In total, FAG claims approximately 10% weight reduction by adopting this drive system, up to 1kg or 2.2 pounds. The weight loss program brings another, perhaps more obscure, advantage -- reducing unsprung weight, which can help automakers improve vehicle chassis dynamics and handling.
At least one automaker has been convinced -- the hub assembly and CV arrangement will appear by mid-2009 on a lineup of unidentified AWD sedans.
FAG points out that the traditional drive arrangement has its faults; there must be clearance to allow the CV joint to slide into the wheel bearing unit. Under day-to-day loads and use, but especially in high horsepower situations with high torque loading and tire friction, those splined areas can be stressed and loosen or fail. Even if they don't fail, over time the wear can cause driveline lash, felt inside the vehicle as harshness and/or vibration. In extreme cases, the splines or bearings can fail.
Reducing the radial clearance to zero in that arrangement is complex and expensive.
FAG's arrangement puts axial splines (essentially gear teeth) on the back side of the hub assembly unit. Matching axial gear teeth are formed on the end of the CV joint, and the whole unit is held in place with a long bolt.
Rather than machine the area as with traditional gear teeth, FAG uses high-precision orbital cold forming.
FAG claims that extensive testing shows the axial spline arrangement allows higher torque transmission than the traditional splined CV method, primarily because the gear teeth operate on a much larger pitch circle.
Orbital forming originally got a foothold at FAG because it allows undriven wheel hub units to be assembled without the traditional interior hub and nut holding the unit together. Instead, the inner is orbitally fixed. FAG has been expanding the use of orbital forming since the late 1980's.
In total, FAG claims approximately 10% weight reduction by adopting this drive system, up to 1kg or 2.2 pounds. The weight loss program brings another, perhaps more obscure, advantage -- reducing unsprung weight, which can help automakers improve vehicle chassis dynamics and handling.
At least one automaker has been convinced -- the hub assembly and CV arrangement will appear by mid-2009 on a lineup of unidentified AWD sedans.
()
【CBCC News Statement】
1.The news above mentioned with detailed source are from internet.We are trying our best to assure they are accurate ,timely and safe so as to let bearing users and sellers read more related info.However, it doesn't mean we agree with any point of view referred in above contents and we are not responsible for the authenticity. If you want to publish the news,please note the source and you will be legally responsible for the news published.
2.All news edited and translated by us are specially noted the source"CBCC".
3.For investors,please be cautious for all news.We don't bear any damage brought by late and inaccurate news.
4.If the news we published involves copyright of yours,just let us know.
1.The news above mentioned with detailed source are from internet.We are trying our best to assure they are accurate ,timely and safe so as to let bearing users and sellers read more related info.However, it doesn't mean we agree with any point of view referred in above contents and we are not responsible for the authenticity. If you want to publish the news,please note the source and you will be legally responsible for the news published.
2.All news edited and translated by us are specially noted the source"CBCC".
3.For investors,please be cautious for all news.We don't bear any damage brought by late and inaccurate news.
4.If the news we published involves copyright of yours,just let us know.
Previous Climax Metal Products Inc. Acquires Cleveland Sales Co.
Next Mini Full Ceramic Bearings Have Arrived (Pic)
Next Mini Full Ceramic Bearings Have Arrived (Pic)
BRIEF INTRODUCTION
Cnbearing is the No.1 bearing inquiry system and information service in China, dedicated to helping all bearing users and sellers throughout the world.
Cnbearing is supported by China National Bearing Industry Association, whose operation online is charged by China Bearing Unisun Tech. Co., Ltd.
China Bearing Unisun Tech. Co., Ltd owns all the rights. Since 2000, over 3,000 companies have been registered and enjoyed the company' s complete skillful service, which ranking many aspects in bearing industry at home and abroad with the most authority practical devices in China.