The H series uses two worm meshes to achieve total nominal ratios from 100:1 to 3,600:1. Its variants cover horizontal and vertical output arrangements, including solid and hollow outputs in the A-derived designs. The broad family torque range combines ratings from several frame sizes and speeds.
Models and shaft configurations
| Model or configuration | Application and construction |
|---|---|
| BH / BHP | Lower worm with horizontal shaft arrangement |
| KH | Vertical solid output |
| AH / ABH / AKH | A-derived solid-output arrangements |
| AOH / AOBH / AOKH | A-derived hollow-output arrangements |
Frame sizes and selection data
| Parameter | Catalog specification |
|---|---|
| BH/BHP/KH center distances | 60, 70, 80, 100, 120, 135, 155, 175, 200, 225, 250, 300, 350, 400, 450 and 500 mm |
| AH/AOH family center distances | 60, 70, 80, 100, 120, 135, 155, 175, 200, 225 and 250 mm |
| Nominal ratio choices | 100, 150, 200, 250, 300, 400, 500, 600, 800, 900, 1,000, 1,200, 1,500, 1,600, 1,800, 2,000, 2,400, 2,500, 3,000 and 3,600 |
| Catalog family torque range | 113–56,600 N·m |
| Example rating point | Size 500 at 100:1 and 1,800 rpm input: 116 kW rated input capacity and 44,890 N·m rated output torque in the H rating table |
Selecting the horizontal or vertical arrangement
Lower-worm configurations place the worm in the oil bath in the designated mounting orientation. The vertical output versions use a thrust-capable bearing arrangement. Use the position-specific drawing to check mounting surfaces, oil plug access and permissible shaft loads.
Reading the rating table
Choose a rating column that matches the input speed and a row that matches the frame and nominal ratio. The size 500 example illustrates how a single rating point fits within the broader family range. Verify the required service factor and thermal rating before matching a motor to the gearbox.
Information for selection and ordering
Specify the input speed, required output speed and torque, daily operating hours, starts per hour, load variation and ambient temperature. Include shaft orientation, handedness, coupling or pulley details, and any overhung or axial loads. Match the duty-adjusted requirement to the rating for the exact frame, ratio and input speed, then check thermal capacity, the mounting drawing and the lubricant specified for the installation.