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Chiaravalli CHM 075 worm gearbox
Chiaravalli

CHM 075 Worm Gearbox (Ø28 mm output shaft)

Worm Gearboxes

CHM 075 worm gearbox with aluminium housing and a standard IEC motor input flange — no coupling or adaptor needed: the motor bolts straight on. Hollow output shaft with 28 mm bore, keyed — it mounts directly onto your driven shaft, and optional output flanges (the F executions on the dimension drawing) are available if you need to flange-mount it. Fits IEC 71 or 80 or 90 or 100 motors (B5 or B14 flange), recommended motors up to 3 kW. Supplied for the B3 mounting position — tell us if you need a different orientation (see the mounting-position drawing). Filled for life with synthetic oil — no oil changes, no maintenance.

Supplied without motor. You are choosing the gearbox only — ask us to quote a suitable motor together with it if you'd like both.

How to pick from the table: with a standard 4-pole motor (1400 r/min), the ratio sets the output speed — e.g. ratio 7.5:1 gives 187 r/min at the output shaft. Choose the row whose output speed and torque match your application, then the flange that matches your motor (the frame size and shaft diameter are on the motor's nameplate). The Motor column lists the motors that fit that row — pick yours and the output torque and service factor update to match. More in the Selection Guide tab below.

Typical applications: conveyor systems, OEM machinery, automation and robotics, agricultural and greenhouse equipment.

Product Configuration

Select a row to add it to your quote

Code RatioMotor flangeMotorOutput speedOutput torqueService factor Weight
CHM-075 R.7.5 90F24 7.5:1 IEC 90 · 24 mm shaft 2.2 kW 186.7 r/min 99 Nm 1.82 9.0 kg
CHM-075 R.7.5 100F28 7.5:1 IEC 100 · 28 mm shaft 3 kW 186.7 r/min 135 Nm 1.33 9.0 kg
CHM-075 R.10 90F24 10:1 IEC 90 · 24 mm shaft 2.2 kW 140 r/min 130 Nm 1.45 9.0 kg
CHM-075 R.10 100F28 10:1 IEC 100 · 28 mm shaft 3 kW 140 r/min 178 Nm 1.07 9.0 kg
CHM-075 R.15 90F24 15:1 IEC 90 · 24 mm shaft 2.2 kW 93.3 r/min 191 Nm 1.09 9.0 kg
CHM-075 R.15 100F28 15:1 IEC 100 · 28 mm shaft 2.2 kW 93.3 r/min 191 Nm 1.09 9.0 kg
CHM-075 R.20 80F19 20:1 IEC 80 · 19 mm shaft 1.1 kW 70 r/min 122 Nm 1.64 9.0 kg
CHM-075 R.20 90F24 20:1 IEC 90 · 24 mm shaft 1.5 kW 70 r/min 167 Nm 1.2 9.0 kg
CHM-075 R.25 80F19 25:1 IEC 80 · 19 mm shaft 1.1 kW 56 r/min 150 Nm 1.36 9.0 kg
CHM-075 R.25 90F24 25:1 IEC 90 · 24 mm shaft 1.5 kW 56 r/min 204 Nm 1 9.0 kg
CHM-075 R.30 80F19 30:1 IEC 80 · 19 mm shaft 1.1 kW 46.7 r/min 170 Nm 1.36 9.0 kg
CHM-075 R.30 90F24 30:1 IEC 90 · 24 mm shaft 1.5 kW 46.7 r/min 232 Nm 1 9.0 kg
CHM-075 R.40 80F19 40:1 IEC 80 · 19 mm shaft 1.1 kW 35 r/min 214 Nm 1 9.0 kg
CHM-075 R.40 90F24 40:1 IEC 90 · 24 mm shaft 1.1 kW 35 r/min 214 Nm 1 9.0 kg
CHM-075 R.50 71F14 50:1 IEC 71 · 14 mm shaft 0.55 kW 28 r/min 129 Nm 1.64 9.0 kg
CHM-075 R.50 80F19 50:1 IEC 80 · 19 mm shaft 0.75 kW 28 r/min 176 Nm 1.2 9.0 kg
CHM-075 R.50 90F24 50:1 IEC 90 · 24 mm shaft 0.75 kW 28 r/min 176 Nm 1.2 9.0 kg
CHM-075 R.60 71F14 60:1 IEC 71 · 14 mm shaft 0.55 kW 23.3 r/min 146 Nm 1.36 9.0 kg
CHM-075 R.60 80F19 60:1 IEC 80 · 19 mm shaft 0.75 kW 23.3 r/min 199 Nm 1 9.0 kg
CHM-075 R.80 71F14 80:1 IEC 71 · 14 mm shaft 0.55 kW 17.5 r/min 178 Nm 1.1 9.0 kg
CHM-075 R.80 80F19 80:1 IEC 80 · 19 mm shaft 0.55 kW 17.5 r/min 178 Nm 1.1 9.0 kg
CHM-075 R.100 71F14 100:1 IEC 71 · 14 mm shaft 0.37 kW 14 r/min 137 Nm 1.34 9.0 kg
CHM-075 R.100 80F19 100:1 IEC 80 · 19 mm shaft 0.37 kW 14 r/min 137 Nm 1.34 9.0 kg

Product Information

Motor pole count

All table figures assume a 4-pole motor (1400 r/min input) — the standard choice for most applications. A 2-pole motor (2800 r/min) doubles the output speed and a 6-pole motor (900 r/min) reduces it, and the power and torque ratings change with them — if you're running anything other than 4-pole, contact us and we'll size it for you.

Service factor — the number that decides how long your gearbox lives

It's the safety margin between what the gearbox can handle and what the motor asks of it: 1.0 means the gearbox works exactly at its rated limit; higher means reserve capacity — a cooler, quieter drive and a much longer life. As a guide: smooth, steady loads (light conveyors, centrifugal pumps) are fine near 1.0; moderate loads (heavier conveyors, packing machines) deserve 1.3 or more; heavy duty (mixers, bucket elevators, frequent starts, long running hours) should sit at 1.5–2.0.

If the service factor turns red after you pick a motor, that combination is below 1.0 — the motor can overload the gearbox in continuous use. It may be acceptable for light, intermittent duty, but for anything continuous choose a smaller motor, a different ratio, or the next gearbox size up — or ask us and we'll size it with you.

Check your selection with the Chiaravalli configurator

Need help specifying this product?

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