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Chiaravalli CHO 52 bevel helical gear unit
Chiaravalli

CHO 52 Bevel Helical Gear Unit (Ø25 mm output shaft)

Bevel Helical Gearboxes

CHO 52 bevel helical gear unit — Chiaravalli's helical hypoid series, made to replace worm gearboxes where efficiency matters (especially at high ratios): high efficiency, low noise, low running temperature, interchangeable with the worm units. Two-stage version (ratios 7.5:1 to 60:1), aluminium housing painted grey RAL 9022, universal mounting. Standard IEC motor input (B5 or B14 flange) through a coupling — fits standard, brake and explosion-proof motors, and suits inverter drives. Hollow output shaft, Ø25 mm H8 bore (Ø20 mm on request); optional output flanges FA-FE and single / double output shafts (see the dimension sheet). Supplied with mineral oil for the B3 mounting position — tell us if you mount it differently, the fill quantity changes. Fits IEC 63, 71, 80, 90 motors — the catalogue lists motors from 0.37 to 1.5 kW for this size.

Supplied without motor. You are choosing the gear unit 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. Radial load Fr2 is the permissible load on the output shaft at that ratio. More in the Selection Guide tab below.

Typical use: drives where energy saving matters, and electric motors run from inverters.

Product Configuration

Select a row to add it to your quote

Code RatioMotor flangeMotorOutput speedOutput torqueService factorRadial load Fr2 Weight
CHO-52 R.7.5 63F11 7.5:1 IEC 63 · 11 mm shaft 0.25 kW 181 r/min 12 Nm 7.8 1510 N 3.5 kg
CHO-52 R.7.5 71F14 7.5:1 IEC 71 · 14 mm shaft 0.55 kW 181 r/min 27 Nm 3.55 1510 N 3.5 kg
CHO-52 R.7.5 80F19 7.5:1 IEC 80 · 19 mm shaft 1.1 kW 181 r/min 54 Nm 1.77 1510 N 3.5 kg
CHO-52 R.7.5 90F24 7.5:1 IEC 90 · 24 mm shaft 1.5 kW 181 r/min 74 Nm 1.3 1510 N 3.5 kg
CHO-52 R.10 63F11 10:1 IEC 63 · 11 mm shaft 0.25 kW 134 r/min 17 Nm 6.6 1670 N 3.5 kg
CHO-52 R.10 71F14 10:1 IEC 71 · 14 mm shaft 0.55 kW 134 r/min 37 Nm 3 1670 N 3.5 kg
CHO-52 R.10 80F19 10:1 IEC 80 · 19 mm shaft 1.1 kW 134 r/min 74 Nm 1.5 1670 N 3.5 kg
CHO-52 R.10 90F24 10:1 IEC 90 · 24 mm shaft 1.5 kW 134 r/min 101 Nm 1.1 1670 N 3.5 kg
CHO-52 R.12.5 63F11 12.5:1 IEC 63 · 11 mm shaft 0.25 kW 112 r/min 20 Nm 6.6 1770 N 3.5 kg
CHO-52 R.12.5 71F14 12.5:1 IEC 71 · 14 mm shaft 0.55 kW 112 r/min 44 Nm 3 1770 N 3.5 kg
CHO-52 R.12.5 80F19 12.5:1 IEC 80 · 19 mm shaft 1.1 kW 112 r/min 88 Nm 1.5 1770 N 3.5 kg
CHO-52 R.12.5 90F24 12.5:1 IEC 90 · 24 mm shaft 1.5 kW 112 r/min 120 Nm 1.1 1770 N 3.5 kg
CHO-52 R.15 63F11 15:1 IEC 63 · 11 mm shaft 0.25 kW 94 r/min 24 Nm 5.28 1880 N 3.5 kg
CHO-52 R.15 71F14 15:1 IEC 71 · 14 mm shaft 0.55 kW 94 r/min 53 Nm 2.4 1880 N 3.5 kg
CHO-52 R.15 80F19 15:1 IEC 80 · 19 mm shaft 1.1 kW 94 r/min 105 Nm 1.2 1880 N 3.5 kg
CHO-52 R.15 90F24 15:1 IEC 90 · 24 mm shaft 1.1 kW 94 r/min 105 Nm 1.2 1880 N 3.5 kg
CHO-52 R.20 63F11 20:1 IEC 63 · 11 mm shaft 0.25 kW 69 r/min 32 Nm 3.9 2080 N 3.5 kg
CHO-52 R.20 71F14 20:1 IEC 71 · 14 mm shaft 0.55 kW 69 r/min 71 Nm 1.77 2080 N 3.5 kg
CHO-52 R.20 80F19 20:1 IEC 80 · 19 mm shaft 0.75 kW 69 r/min 97 Nm 1.3 2080 N 3.5 kg
CHO-52 R.20 90F24 20:1 IEC 90 · 24 mm shaft 1.1 kW 69 r/min 142 Nm 0.89 2080 N 3.5 kg
CHO-52 R.25 63F11 25:1 IEC 63 · 11 mm shaft 0.25 kW 58 r/min 39 Nm 3.3 2200 N 3.5 kg
CHO-52 R.25 71F14 25:1 IEC 71 · 14 mm shaft 0.55 kW 58 r/min 85 Nm 1.5 2200 N 3.5 kg
CHO-52 R.25 80F19 25:1 IEC 80 · 19 mm shaft 0.75 kW 58 r/min 116 Nm 1.1 2200 N 3.5 kg
CHO-52 R.25 90F24 25:1 IEC 90 · 24 mm shaft 1.1 kW 58 r/min 170 Nm 0.75 2200 N 3.5 kg
CHO-52 R.30 63F11 30:1 IEC 63 · 11 mm shaft 0.25 kW 48 r/min 47 Nm 2.86 2350 N 3.5 kg
CHO-52 R.30 71F14 30:1 IEC 71 · 14 mm shaft 0.55 kW 48 r/min 103 Nm 1.3 2350 N 3.5 kg
CHO-52 R.30 80F19 30:1 IEC 80 · 19 mm shaft 0.55 kW 48 r/min 103 Nm 1.3 2350 N 3.5 kg
CHO-52 R.40 63F11 40:1 IEC 63 · 11 mm shaft 0.25 kW 35 r/min 64 Nm 2.07 2610 N 3.5 kg
CHO-52 R.40 71F14 40:1 IEC 71 · 14 mm shaft 0.37 kW 35 r/min 95 Nm 1.4 2610 N 3.5 kg
CHO-52 R.40 80F19 40:1 IEC 80 · 19 mm shaft 0.55 kW 35 r/min 141 Nm 0.94 2610 N 3.5 kg
CHO-52 R.50 63F11 50:1 IEC 63 · 11 mm shaft 0.25 kW 28.7 r/min 78 Nm 1.63 2790 N 3.5 kg
CHO-52 R.50 71F14 50:1 IEC 71 · 14 mm shaft 0.37 kW 28.7 r/min 116 Nm 1.1 2790 N 3.5 kg
CHO-52 R.50 80F19 50:1 IEC 80 · 19 mm shaft 0.55 kW 28.7 r/min 172 Nm 0.74 2790 N 3.5 kg
CHO-52 R.60 63F11 60:1 IEC 63 · 11 mm shaft 0.25 kW 24 r/min 94 Nm 1.2 2960 N 3.5 kg
CHO-52 R.60 71F14 60:1 IEC 71 · 14 mm shaft 0.25 kW 24 r/min 94 Nm 1.2 2960 N 3.5 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?

Our technical team can help you specify the right component. Add it to your quote basket above, or contact us directly.

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