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Traction Drive Type A
An excellent choice for the wheel drive assembly in AGV’s and intelligent mobile equipment.
The Traction Drive mechanism produces smooth rotation and eliminates speed irregularity due to the high frequency vibration inherent in gear transmission. This is how the traction drive provides high rotational accuracy with low noise. Transmission through either cones or planet rollers being contacted under pressure allows the system to eliminate backlash when paired with full closed loop control. This allows the differential to approach zero backlash and achieve extremely high positional accuracy.
Frame Sizes
Primary Advantages of the Traction Drive
Negligible Transmission Error
- Smooth rolling contact allows for negligible transmission error
- Eliminates speed irregularity inherent in gear transmissions
- Great fit in application where the angular velocity ratio is important
Minimal Noise Generated
- Removal of the gear mesh minimizes noise and vibration
- The noise generated will be in the 40–50 dB-A range
- In comparison to gear transmissions which generally fall in the 60–80 dB-A range
Why technology is referred to as the “gearless gearbox?
The traction drive is a non-gear reduction technology that minimizes vibration and noise. The negligible transmission error makes it the smoothest and most quiet method to mechanical adjust speed and torque. The following a brief explanation.
- The traction drive assembly consists of two smooth rollers held in fixed position with mechanical properties that include high hardness
- (Fn) Power is transmitted from the driven roller to the passive roller through viscous film
- When under pressure, this oil film will have a higher friction coefficient
- The speed differential between the rollers creates a tangential force (traction force, Ft) that shears the oil film
- The reduction ratio is determined by diameter of inner ring that contains the roller assembly and the number of planetary rollers, among other minor factors
- When the normal force (Fn) is deficient slippage can occur; we can control through close loop feedback
Well Suited for Fine Precision
The traction drive is a non-gear reduction technology that minimizes vibration and noise. The negligible transmission error makes it the smoothest and most quiet method to mechanical adjust speed and torque. The following a brief explanation.
- Very low noise and vibration for input speeds up to 10,000rpm
- Exceptional rotation al accuracy and fine precision of <5 arc-sec
- Extremely compact and achieves up to a 20:1 reduction ratio in a single stage
- Currently available in frame sizes up to 1kW; all designs are customized for the OEM
- A potential technological improvement in many applications such as the following; Collaborative or mobile service robots, High quality imaging or high speed printing, 3D printing or precision measurement, and Medical equipment or mobility assist
