WR Inline Helical Gear Reducers

MANUFACTURER DOCUMENTATION

Overview

WR is an inline helical-reducer range with two- and three-stage gear trains. WUMA lists HT250 cast iron for the housing and foot, shaft and flange installation options. The source identifies thirteen frame designations and a family efficiency envelope of 94–98%, rather than a single efficiency valid at every load. WR and the newer modular MR range are separately named by the manufacturer; this page documents WR only. For replacement work, compare the complete mounting drawing and motor connection, then ask for a model-specific ratio and torque rating at the intended input speed.

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Published series specifications

Series ranges describe the product family. They are not interchangeable operating points.

Frames

WR17 / 27 / 37 / 47 / 57 / 67 / 77 / 87 / 97 / 107 / 137 / 147 / 167

Gear stages

Two or three

Housing

HT250 cast iron

Mounting

Foot, shaft or flange

Published efficiency envelope

94–98%; confirm operating point

Ratio and torque table

Not supplied on this source page

Model configuration table

The source page provides a series overview rather than a complete model/ratio rating table. Use the manufacturer link above for selection drawings and confirm the precise operating point before ordering.

Before you specify this gearbox

Helical gearboxes are used in a broad range of industrial drives. Mounting position, service factor, thermal capacity and lubrication are part of selection, not just the nameplate power.

• Confirm continuous, peak and emergency-stop load limits separately.
• Match the motor flange, shaft, mounting orientation and lubrication requirements.
• Request the current drawing revision and selection calculation from the manufacturer.

Related products

Boneng

H / B Industrial Gearboxes

Modular helical and bevel-helical gearboxes for industrial drives. H and B have different ratio and power envelopes; size, mounting, thermal capacity and service factor determine the final selection.

H output torque

6.7–1,030 kNm

H ratio

5.6–450

H input power

10–15,775 kW

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NGC

MHB Standard Industrial Gearboxes

NGC’s modular MHB family includes helical and bevel-helical arrangements, multiple output modes and application-specific accessories for industrial machinery.

Series torque range

2–1,400 kN·m (2,000–1,400,000 Nm)

Speed ratio range

1.25–450

Architectures

Helical / bevel-helical

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