Preloaded Double Pinions eliminate backlash.

Press Release Summary:

Designed to eliminate backlash between rack and pinion in linear motion applications, PDP is made of 2 ground WMH pinions, each ½ width of rack, connected together through coupling, preload system. Preload torque can be adjusted, and units are equipped with ISO 9409-1 flange for adapting to speed reducers. Offered with straight or helical gears in modules from 3-8, PDP accepts speeds up to 1,200 rpm and offers torque capacity from 55-1,900 nm, depending on size and preload torque setting.

Original Press Release:

PDP Eliminates Rack & Pinion Backlash

The Preloaded Double Pinions, PDP, from Redex Andantex is designed to provide a cost effective method of eliminating backlash between the rack and pinion in high precision linear motion applications. The PDP is made of two ground WMH pinions, each ½ the width of the rack, connected together through a patented coupling, preload system that cancels the backlash between rack and pinion providing a competitive alternative to ball screw drive systems.

The preload torque of the PDP is easily adjusted and the units are equipped with an ISO 9409-1 flange for adapting to speed reducers. Redex Andantex combines the PDP with SRP High-Tech Planetary reducers where it provides a total system backlash < 1 arc-minute, high torsional rigidity and high tilting moment capacity. In fact the SRP-PDP sub-assembly offers 10 to 20% higher rigidity than competitive alternatives. Furthermore, this arrangement can eliminate the need for two electrically preloaded planetary reducers in certain applications.

The PDP is offered with straight (spur) or helical gears in modules from 3 to 8 and accepts speeds up to 1200 RPM. Torque capacity ranges from 55 - 1900 NM depending on the size and preload torque setting. When mounted on the SRP other features include eight reduction ratios, in line or right angle versions, and complete solutions including reducer, PDP, rack and automatic rack lubrication systems. The input interface is adapted for direct mounting of the servo-motor.

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