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Date: 2013-08-29

Schaeffler's bearing expertise ensures the highest levels of dynamics, efficiency and comfort on e-bikes

Schaeffler provides comfort, dynamics and efficiency on e-bikes with its portfolio of FAG sensor bottom brackets and large range of other components from the INA and FAG brands. The focus is always on freedom from maintenance and a long operating life with the highest possible level of smoothness.

Assistance on demand thanks to precise control
Torque sensor bottom brackets from the FAG brand have established themselves on the market as top models for maximum riding comfort. In particular, the BBRTTS with torque measurement on both sides offers maximum riding comfort, higher efficiency and a longer range. The BBRTTS determines the total torque from the sum of the pedal force from the left and right pedals. This bearing unit detects the rider's requirement for motor assistance depending on the situation and controls the output accordingly. It offers the shortest reaction times from the control system with up to 72 speed impulses per rotation of the crank so that the rider only has to cover very short distances (approx. 10 cm) before the motor provides the required assistance. Conventional torque sensor bottom brackets supply a maximum of 36 speed impulses per rotation of the crank so that a distance of approximately 40 to 100 cm must be covered before the assistance takes effect.

The high resolution and accuracy of the torque sensor system are a prerequisite for the quality of the output signal and rapid response of the motor control system. The rider is thus provided with optimum assistance in every situation. This is associated not only with comfort, dynamics and riding pleasure but also with maximum efficiency, which results in an increased range.

The sensor bottom bracket BBRTS allows non-contact measurement of speed, direction of rotation and torque (left pedal). With up to 72 speed impulses per revolution of the crank, it offers very high resolution speed signals for precise and comfortable rider assistance, for example, in the e-bike from smart (manufacturer: Daimler)

Schaeffler is also presenting the basic sensor bottom bracket model BBRS in an advanced variant. It enables non-contact measurement of the speed and direction of rotation. 36 impulses are generated per revolution of the spindle.

Smooth running due to FAG deep groove ball bearings
FAG deep groove ball bearings are used in front wheels, rear wheels and the center drive. The improved surface structures of raceways and balls reduce noise generation by 50 percent in comparison to conventional deep groove ball bearings. These improvements in combination with the improved surface quality also reduce friction by 35 percent. The lower frictional torque and reduced heat generation make this bearing very suitable for high speeds.

Seals also play a decisive role in terms of reliability and energy efficiency in dusty and wet conditions. The newly developed efficient lip seal (ELS) offers an unbeatable combination of reliability and energy efficiency. This enables the frictional torque and thus the power loss of the wheel bearing to be significantly reduced at increasing speeds with improved sealing action. The new ELS therefore fulfills seemingly contradictory requirements: With its increased sealing action it provides better protection for the bearing and improved smooth running.

Other bearing positions and components
FAG angular contact ball bearings fitted as headset bearings in the connecting point between the handlebar stem and the bicycle fork ensure the necessary precision and safety. The forces acting on the stanchions of the suspension forks during riding are supported and transmitted by INA plain bearings with ELGOGLIDE. INA drawn cup roller clutches are used as one-way clutches in the drive of the electric motor. They transmit high torques in one direction. The FAG bottom bracket spindle connects the pedals and sensor unit in the drive. A special Corrotect® coating and bottom bracket spindles of various designs are available as options.
(Schaeffler Group USA Inc.)

 


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