Redex Andantex is launching the KRP+ specialised range of reduction gears, with exceptional rigidity for highly demanding rack-and-pinion drive applications. The KRP+ is available in six standard universal sizes. For size 6, torsional rigidity is 5,500,000Nm/rad, while radial rigidity is 960,000N/mm and axial rigidity is 6,194,000N/mm, which the company says exceeds market standards by a substantial margin.
The rigidity of KRP+ is a consequence of its design that features an integrated output pinion and reinforced output bearing. Each output pinion is machined to the same diameter as the shaft, giving the optimum compromise between transmissible torque and rigidity at the rack.
Output bearings consist of two preloaded and substantially oversized angular-contact roller bearings. This arrangement enables the bearing to support the pinion as close as possible to the load, as only the thickness of the fastening nut separates the pinion from the output bearing. This design reduces radial bending, which is responsible for 60 per cent of overall distortion but is nevertheless still poorly handled by most existing systems.
The result is increased dynamic precision thanks to its capacity to displace heavier loads at higher speeds. Its performance, in terms of stiffness combined with low inertia, enable higher accelerations to be achieved (up to 25m/s2). As a consequence, the resonant frequency of the drive systems in which it is incorporated is raised significantly.
KRP+ units can be used singly or in pairs. In the second case, preloading enables zero backlash to be achieved, which is particularly useful in high-precision systems.
For more information, visit www.redex.fr
