The ETR251/46 gear rack drive is a low-maintenance, purpose-designed drive for opening and closing swinging-environment vents in Venlo-type greenhouses. The mixture of TR251/46 gear rack drive and aEP RW engine gearbox contributes to an optimum greenhouse climate thanks to accurate positioning of the surroundings vents.

The self-supporting TR251/46 equipment rack drive planetary gearbox comprises a zinc-plated C-profile with a built-in 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 gear rack drive, the drive torque is effectively changed into a optimum rack force of 4200 N. Monitor rollers in the C-profile and guidebook blocks ensure stable extension and retraction of the rack. The drive shafts of the TR251/46 gear rack drive have lengthy, flat-sided journals. This makes it possible to fit drive shafts (prefab) installed with weld/sleeve couplings or chain couplings, once the house units have been mounted. 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 request.


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As one of leading manufacturers, suppliers and exporters of mechanical products in China, We offer reducers, sprockets, industrial and conveyor chain, belts, pulleys, gears, racks, gearboxes, motors, PTO Shafts, taper lock Bushing, vacuum Pumps, screw air compressors and many other products. Please contact us for details.

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