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Two-Speed Gearbox, Two-Speed Gearboxes from ZF Industries. The ZF-DUOPLAN two-speed gearbox is mainly used in machine tool drives. By way of example, the gearbox can be used in turning machines (horizontal B5) or machining centers (vertical V1) thanks to its variable installation position. The gearbox is also suitable for use in many systems in which torque increase and/or speed reduction is required.

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Benefits

Machine tools are designed to be universal so that they can process different materials. This requires both high cutting speeds for soft materials as well as high cutting forces for hard materials - requirements which a gearbox can fulfill since a gearbox can either retain high motor speeds (i = 1:1) or multiply the motor torque (e.g. ratio i = 4.00) and reduce the rpm, both by the same factor. The cutting power is therefore constant and remains available across a wide rpm band. The only cost-effec-tive way to achieve this flexibility is by using a gearbox; more powerful motors can generate the high cutting forces required, but they cannot do this at high speeds.

The gearboxes have coaxial output and are suitable for the high rpm generated in machine tool construction.

Design

ZF Maschinenantriebe developed the ZF-Duoplan two-speed single planetarygearbox in single stage design, with shift mechanism to meet strict machine tool requirements with respect to high running smoothness and low-noise operation. In contrast to conventional spur gear-boxes in lay-shaft design, this planetary gearbox has the distinct advantage of allowing an extremely compact and spacesaving design since the power is split between 4 or 5 planetary gears. In addition, the four resp fire simultaneously meshing planetary gears with helical gearing also assure low-noise operation at high speeds. The floating sun gear balances concentricity and changes in center distance, so that the planetary mechanism does not react nearly as critically to tolerances. The motor-gearbox unit is commonly fixed to the machine by using the gearbox is housing footmounting. (2K120, 2K250 and 2K300 only). Additionally each gearbox has available for flange mounting with pilot centering spigot. The output bearings provide the optimum solution for any application thanks to a choice of bearings and their wide bearing base. Different output housing variants cater to various spindle drive arrangements; e.g. ZF-Duoplan with longer bearing base allowing high cantilever forces for belt drives, ZF-Duoplan INLINE with short output housing and angular contact bearings for direct drive and ZF-Duoplan TSC (Through-Spindle-Cooling) to facilitate the transfer of cutting liquids like emulsions, hydraulic oils and air-oil mixtures with up to 140 bars of pressure at a flow rate of 35 l/min through the gearbox and spindle, directly to the tool.