New Product Info
SKF Develops Hub Unit for Compact Dual-disc Wheel-end(Sep 24,2007)
SKF Develops Hub Unit for Compact Dual-disc Wheel-end
SKF, the leading knowledge engineering company, has developed an advanced wheel-end for commercial vehicles, called the ModulD, in a joint project with Haldex, a vehicle systems specialist headquartered in Sweden. The system incorporates a caliper brake with dual-discs and combines high torque and lightweight characteristics due to the use of compact SKF hub units.
Development of the wheel end began in 2000, when Haldex approached SKF as the most experienced hub bearing unit manufacturer worldwide, having produced more than five million units to date. Following continuous consultation with Haldex, SKF developed a tailor-made integrated slim-line hub unit for use in the wheel-end.
The ModulD solution incorporates a hub unit of extremely slim design that offers a precisely adjusted interplay between the bearing, grease and seals. The dual discs are positioned on the toothwork of the integrated hub, interlocked, with five specially designed springs permitting lateral displacement to ensure wear compensation and clearance. They also ensure that the contact between the hub and disc does not become too close, to avoid excessive heat dissipation in the hub. The disc virtually floats on the hub keeping noise to a minimum. The low thermal stress on the hub results in long hub life and, at the same time, means less strain for the tyres.
The new brake concept also offers retrofit potential with customers able to use the old axle and its journal; the hub is suitable for nearly all journals if the bearing unit bore diameter ranges between 80 and 105mm. The brake itself is extremely versatile, too. For 22.5 inch wheels, Haldex uses discs brakes that are 21 inches in diameter. The result is a weight-optimised solution that saves up to 90 kilograms per triple-axle suspension.
Using the same hub and clamping unit but a 19.5 inch disc, the Haldex modular concept also enables the construction of a fixed caliper brake for 19.5 inch wheels, which is ideal for applications where minimising weight is crucial; compared with conventional 22.5 inch wheel ends, it reduces the weight per axle by as much as 35 kilograms. The SKF-Haldex wheel end weighs about 15% less than current conventional solutions, which typically weigh some 25 kilograms per axle.
The system is also suitable for heavier clamping torques. With a robust design and fitted with a dual disc, the fixed caliper brake is capable of providing clamping torques of up to 35kNm for use with future generations of vehicles.
The wheel end has been designed for one million kilometres of maintenance-free operation. When the discs are worn down, they can easily be drawn off the axles as soon as the wheel flange has been dismounted and the locking device opened. The pads can also be easily replaced from overhead without having to dismount the wheel flange or other components, making the ModulD an excellent balance of performance and user friendly design, achieved through close partnership between SKF and Haldex.
SKF Develops Hub Unit for Compact Dual-disc Wheel-end
SKF, the leading knowledge engineering company, has developed an advanced wheel-end for commercial vehicles, called the ModulD, in a joint project with Haldex, a vehicle systems specialist headquartered in Sweden. The system incorporates a caliper brake with dual-discs and combines high torque and lightweight characteristics due to the use of compact SKF hub units.
Development of the wheel end began in 2000, when Haldex approached SKF as the most experienced hub bearing unit manufacturer worldwide, having produced more than five million units to date. Following continuous consultation with Haldex, SKF developed a tailor-made integrated slim-line hub unit for use in the wheel-end.
The ModulD solution incorporates a hub unit of extremely slim design that offers a precisely adjusted interplay between the bearing, grease and seals. The dual discs are positioned on the toothwork of the integrated hub, interlocked, with five specially designed springs permitting lateral displacement to ensure wear compensation and clearance. They also ensure that the contact between the hub and disc does not become too close, to avoid excessive heat dissipation in the hub. The disc virtually floats on the hub keeping noise to a minimum. The low thermal stress on the hub results in long hub life and, at the same time, means less strain for the tyres.
The new brake concept also offers retrofit potential with customers able to use the old axle and its journal; the hub is suitable for nearly all journals if the bearing unit bore diameter ranges between 80 and 105mm. The brake itself is extremely versatile, too. For 22.5 inch wheels, Haldex uses discs brakes that are 21 inches in diameter. The result is a weight-optimised solution that saves up to 90 kilograms per triple-axle suspension.
Using the same hub and clamping unit but a 19.5 inch disc, the Haldex modular concept also enables the construction of a fixed caliper brake for 19.5 inch wheels, which is ideal for applications where minimising weight is crucial; compared with conventional 22.5 inch wheel ends, it reduces the weight per axle by as much as 35 kilograms. The SKF-Haldex wheel end weighs about 15% less than current conventional solutions, which typically weigh some 25 kilograms per axle.
The system is also suitable for heavier clamping torques. With a robust design and fitted with a dual disc, the fixed caliper brake is capable of providing clamping torques of up to 35kNm for use with future generations of vehicles.
The wheel end has been designed for one million kilometres of maintenance-free operation. When the discs are worn down, they can easily be drawn off the axles as soon as the wheel flange has been dismounted and the locking device opened. The pads can also be easily replaced from overhead without having to dismount the wheel flange or other components, making the ModulD an excellent balance of performance and user friendly design, achieved through close partnership between SKF and Haldex.
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