Email
WhatsApp
DRV series is a factory-assembled combination of two worm gearboxes stacked in one frame. The first stage brings the input speed down to an intermediate level, and the second stage takes that intermediate speed down again to the final output. This two-in-one arrangement covers very high reduction ratios that a single-stage worm reducer cannot reach, while keeping the overall footprint small. Torque capability scales with the frame size, from DRV-40 up to DRV-110, with maximum output torque up to 1800 Nm on the largest model. The worm shafts are surface-hardened to HRC 55–60, and the worm wheels use a wear-resistant bronze alloy, so the unit handles continuous reversing load on conveyors, mixers and packing lines.
A DRV unit houses two worm gear stages in a single frame. The two stages are bolted and aligned at the factory, so the customer does not need to match two separate gearboxes, cut a coupling, or build the intermediate shaft on site.
The input stage takes the motor speed down to an intermediate speed. It is matched to the frame size that the motor flange bolts onto, and it takes most of the input torque shock.
The output stage takes the intermediate speed down to the final output speed. It uses the larger frame so it can carry the multiplied torque out to the driven machine.
Each combination pairs a smaller input frame with a larger output frame. The two frames are chosen so the cumulative ratio and cumulative torque fall inside the safe working range of both stages.
The bar length below shows the relative maximum output torque of each combination. DRV-90+110 reaches 1800 Nm and the smaller combinations scale down proportionally.
Both ends of the DRV unit can be configured for the driven machine. The combination ratio stays the same regardless of the interface choice, so the interface is chosen after the ratio and torque are confirmed.
B5 or B14 flange machined to IEC standard, so a standard three-phase or brake motor can bolt directly onto the input stage. Removes the need for a separate coupling and bell housing.
Keyed input shaft for pulley, sprocket or coupling drive. Used when the motor is mounted separately on the machine, or when one motor drives several DRV units through a line shaft.
Hollow bore with keyway or shrink disc for direct mounting onto a driven shaft. Used on screw conveyors, agitators and winch drums where the gearbox sits on the driven shaft.
Keyed solid output shaft for coupling to a pulley, sprocket or driven hub. Used on conveyors, mixers and rotary tables with a traditional keyed connection.
The five frames below are the building blocks of DRV combinations. Each frame can be used as the input stage, output stage or a standalone single-stage unit.
DRV double worm gearboxes are used wherever a driven machine needs very high reduction ratios and the drive must sit at 90° to the output shaft.
Warehouse and distribution centre conveyors where a slow, high-torque output is needed on the head pulley.
Filling heads, sealing jaws and labeling axes on packaging machinery with slow but steady output speeds.
Dough kneaders, food grinders and industrial mixers, with food-grade lubricant and stainless options available.
Lifting equipment where the output speed must be very low and the torque very high under continuous load.
Chemical, pharmaceutical and paint processing where slow mixing requires very high torque at low speed.
Slow indexing tables and positioners where the input speed must drop to a precise, repeatable output speed.
Every DRV unit is inspected for worm shaft hardness, gear tooth geometry, housing bore runout, backlash, noise and leak tightness before packing. Material certificates are available.
ISO 9001:2015 certified quality management from raw material to final assembly. Products comply with DIN and AGMA gear standards.
Common questions about combination ratios, mounting and OEM supply.
Provide required output torque, output speed, ratio, input power, mounting configuration and output shaft drawing. Raydafon will confirm the correct DRV combination, ratio and interface, and reply with a factory-direct quotation within 24 hours.
Address
Luotuo Industrial Area, Zhenhai District, Ningbo City, China
Tel
