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Linear Drive Has Zero Backlash

Originally Published MPMN May 2005

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Linear Drive Has Zero Backlash

Special rolling ring bearings provide constant single-point contact between the bearings and the drive shaft

Susan Wallace

Analyzers from CEA
Instruments are simple to calibrate
using any two oxygen
concentrations.

An alternative to leadscrew-based linear drive systems provides backlash-free linear motion. The Model RS4 drive nut from Amacoil Inc. (Aston, PA) is available in seven sizes to meet varying payload and linear speed requirements. It is configurable for vertical or horizontal travel. Shaft rotational speeds may be up to 10,000 rpm, depending on the size of the drive nut. Linear travel speeds range from 0.5 up to 4.0 ft/sec, depending of the size of the drive and the weight of the payload. Axial thrust ranges from 22 to 449 lb.

Specially machined Uhing rolling ring bearings are installed under pressure inside the drive. There is constant single-point contact between the bearings and the drive shaft. The result is zero play when the shaft is rotated, even during reversal. Antibacklash solutions, such as preloaded nuts or double enveloping gears, are not required.

The shaft in the rolling ring system is smooth. There are no threads where dirt and debris can become trapped. Therefore the system will not clog or jam and there is no need to stop the system to clean the shaft. Designing in a protective bellows assembly is not necessary. The smooth shaft in the assembly also provides built-in overload protection. If the system is overloaded, the shaft slips instead of churning and grinding.

Copyright ©2005 Medical Product Manufacturing News

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