The ETR251/46 gear rack drive is a low-maintenance, purpose-designed drive for starting and closing swinging-air vents in Venlo-type greenhouses. The combination of TR251/46 gear rack drive and aEP RW electric motor gearbox plays a part in an optimum greenhouse climate thanks to accurate positioning of the atmosphere vents.
The self-supporting TR251/46 gear rack drive comprises a zinc-plated C-profile with an integral compact equipment rack drive unit. The TR251/46 equipment rack drive is installed to a greenhouse gutter using the accessory clamp-mounting forks or bows.
Thanks to the gear reduction stage (i-2.76) and the pinion of the TR251/46 equipment rack drive, the drive torque is effectively converted into a maximum rack force of 4200 N. Monitor rollers in the C-profile and guide blocks ensure stable expansion and retraction of the rack. The drive shafts of the TR251/46 equipment rack drive have lengthy, flat-sided journals. This can help you suit drive shafts (prefab) fitted with weld/sleeve couplings or chain couplings, after the house units have already been installed. The drive shafts are locked in the couplings by the accompanying shaft retaining clips. The TR251/46 equipment rack drive is simple 
to maintain.
A ETR251/46 gear rack drive with other C-profile lengths and rack lengths is on planetary gearbox request.
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