Vironkatu 9, 00170 Helsinki

Janne Jokela
050 412 9030

Taneli Jokela
050 320 8174

Tero Lahtinen
050 464 7972

Satunnaiset kuvat

Eight-fold increase in service life with full power

15.06.2019 11:11


With dynamic load capacities of up to 544 kN, the long-lasting PLSA Planetary Screw Assemblies from Rexroth transmit high forces particularly quickly. The product family with finely graduated spindle diameters of 20 to 75 mm covers a broad power spectrum in the top performance range and with speeds of up to 50 m/min. Equipped with a new system of pre-tensioned Single Nuts – cylindrical and with a flange – they achieve load ratings which are twice as high as for conventional pre-tensioning systems available on the market. As a result, the nominal life of the PLSA is eight times longer. PLSA are also at the heart of the EMC-HD Heavy Duty Electromechanical Cylinders. 

In the PLSA Planetary Screw Assemblies, nine planets revolve around the thread spindle. This design principle results in large contact surfaces in relation to the unit dimensions and allows electro-mechanical axes equipped with PLSA to be used for a much broader range of applications. PLSA increase the thrust forces significantly compared to Ball Screw Assemblies. Bosch Rexroth has expanded the range of finely graduated diameter/gradient combinations available by adding new intermediate sizes. 

The Cylindrical Single Nuts with flange are available both with axial backlash and in pre-tensioned form. The new type of pre-tensioning for zero-clearance operation is unique on the market to date and is based on sorting the planets with micrometer accuracy. This allows load ratings which are twice as high and a nominal life which is eight times longer than that of conventional system available on the market. This is particularly important for applications involving very short strokes, for example applying viscous adhesives and sealants when manufacturing vehicles or during friction welding. In addition, a seal which effectively has a wiping effect prevents shavings, dust and liquids entering the nut even in adverse environmental conditions. 

Bosch Rexroth has a wealth of experience when it comes to the manufacture of Planetary Screw Assemblies and produces the PLSA threaded spindles using a rolling procedure on bearings. In order to manufacture the planets, the company only recently began using a new generation of planet grinding machines. The process is so precise that Rexroth can manufacture spindles, nuts and planets separately. This reduces delivery times and allows the local production of customer-specific Planetary Screw Assemblies in Europe, Asia and America. Users define their PLSAs using an online configurator which guides them through all options with image support. They can then transfer the configured assemblies to the Rexroth e-shop at the click of a mouse and see the price and delivery time straight away. 

The PLSA are at the heart of the EMC-HD Heavy Duty Electromechanical Cylinder. Mechanical and electronic systems are combined to produce a ready-to-install actuator. The EMC-HD is increasingly being used as an energy-efficient drive for applications involving large forces. Users can parameterize and change the travel profile flexibly via the drive software. The EMC-HD is available as a purely mechanical assembly or as a plug and run solution with an intelligent IndraDrive servo drive.

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