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Chiaravalli CHC 20 helical gear unit
Chiaravalli

CHC 20 Helical Gear Unit (Ø20 mm output shaft)

Helical Gearboxes

CHC 20 helical gear unit — Chiaravalli's modular helical series with an aluminium housing, carbonised and ground gears, and a standard IEC motor input (B5 or B14 flange) — no coupling or adaptor needed: the motor bolts straight on. Solid keyed output shaft, Ø20 mm h6; foot or output-flange mounting (see the dimension sheet), any mounting position. Lubricated for life with synthetic oil (Shell Tivela S 320) in the standard position — for V6 / V3 mounting tell us, the fill quantity changes. Fits IEC 63, 71, 80 motors, recommended motors up to 1.1 kW. Where the table notes a reduction bushing, the motor shaft is adapted to the pinion with Chiaravalli's metal bushing (supplied with the unit).

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 4.6:1 gives 304 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: textile, food and beverage, chemical and packaging machinery — conveyors, mixers, OEM drives.

Product Configuration

Select a row to add it to your quote

CodeRatioMotor flangeMotorOutput speedOutput torqueService factor Weight
CHC-20 R.4.6 63F11 4.6:1 IEC 63 · 11 mm shaft 0.25 kW 302 r/min 7.6 Nm 9.24 4.7 kg
CHC-20 R.4.6 71F14 4.6:1 IEC 71 · 14 mm shaft 0.55 kW 302 r/min 17 Nm 4.2 4.7 kg
CHC-20 R.4.6 80F19 4.6:1 IEC 80 · 19 mm shaft 1.1 kW 302 r/min 33 Nm 2.1 4.7 kg
CHC-20 R.5.7 63F11 5.7:1 IEC 63 · 11 mm shaft 0.25 kW 246 r/min 9.3 Nm 7.52 4.7 kg
CHC-20 R.5.7 71F14 5.7:1 IEC 71 · 14 mm shaft 0.55 kW 246 r/min 20 Nm 3.42 4.7 kg
CHC-20 R.5.7 80F19 5.7:1 IEC 80 · 19 mm shaft 1.1 kW 246 r/min 41 Nm 1.71 4.7 kg
CHC-20 R.7.7 63F11 7.7:1 IEC 63 · 11 mm shaft 0.25 kW 181 r/min 13 Nm 6.32 4.7 kg
CHC-20 R.7.7 71F14 7.7:1 IEC 71 · 14 mm shaft 0.55 kW 181 r/min 28 Nm 2.87 4.7 kg
CHC-20 R.7.7 80F19 7.7:1 IEC 80 · 19 mm shaft 1.1 kW 181 r/min 56 Nm 1.44 4.7 kg
CHC-20 R.9.8 63F11 9.8:1 IEC 63 · 11 mm shaft 0.25 kW 143 r/min 16 Nm 7.48 4.7 kg
CHC-20 R.9.8 71F14 9.8:1 IEC 71 · 14 mm shaft 0.55 kW 143 r/min 35 Nm 3.4 4.7 kg
CHC-20 R.9.8 80F19 9.8:1 IEC 80 · 19 mm shaft 1.1 kW 143 r/min 71 Nm 1.7 4.7 kg
CHC-20 R.11.9 63F11 11.9:1 IEC 63 · 11 mm shaft 0.25 kW 118 r/min 19 Nm 6.16 4.7 kg
CHC-20 R.11.9 71F14 11.9:1 IEC 71 · 14 mm shaft 0.55 kW 118 r/min 43 Nm 2.8 4.7 kg
CHC-20 R.11.9 80F19 11.9:1 IEC 80 · 19 mm shaft 1.1 kW 118 r/min 86 Nm 1.4 4.7 kg
CHC-20 R.13.8 63F11 13.8:1 IEC 63 · 11 mm shaft 0.25 kW 101 r/min 23 Nm 4 4.7 kg
CHC-20 R.13.8 71F14 13.8:1 IEC 71 · 14 mm shaft 0.55 kW 101 r/min 50 Nm 1.82 4.7 kg
CHC-20 R.13.8 80F19 13.8:1 IEC 80 · 19 mm shaft 0.75 kW 101 r/min 68 Nm 1.33 4.7 kg
CHC-20 R.17.9 63F11 17.9:1 IEC 63 · 11 mm shaft 0.25 kW 78.4 r/min 29 Nm 3.08 4.7 kg
CHC-20 R.17.9 71F14 17.9:1 IEC 71 · 14 mm shaft 0.55 kW 78.4 r/min 64 Nm 1.4 4.7 kg
CHC-20 R.17.9 80F19 17.9:1 IEC 80 · 19 mm shaft 0.75 kW 78.4 r/min 88 Nm 1.03 4.7 kg
CHC-20 R.19.8 63F11 19.8:1 IEC 63 · 11 mm shaft 0.25 kW 70.6 r/min 33 Nm 3.68 4.7 kg
CHC-20 R.19.8 71F14 19.8:1 IEC 71 · 14 mm shaft 0.55 kW 70.6 r/min 72 Nm 1.67 4.7 kg
CHC-20 R.19.8 80F19 19.8:1 IEC 80 · 19 mm shaft 0.75 kW 70.6 r/min 98 Nm 1.23 4.7 kg
CHC-20 R.23.6 63F11 23.6:1 IEC 63 · 11 mm shaft 0.25 kW 59.4 r/min 38 Nm 3.12 4.7 kg
CHC-20 R.23.6 71F14 23.6:1 IEC 71 · 14 mm shaft 0.55 kW 59.4 r/min 85 Nm 1.42 4.7 kg
CHC-20 R.23.6 80F19 23.6:1 IEC 80 · 19 mm shaft 0.75 kW 59.4 r/min 115 Nm 1.04 4.7 kg
CHC-20 R.28.5 63F11 28.5:1 IEC 63 · 11 mm shaft 0.25 kW 49.1 r/min 47 Nm 2.56 4.7 kg
CHC-20 R.28.5 71F14 28.5:1 IEC 71 · 14 mm shaft 0.55 kW 49.1 r/min 103 Nm 1.16 4.7 kg
CHC-20 R.28.5 80F19 28.5:1 IEC 80 · 19 mm shaft 0.55 kW 49.1 r/min 103 Nm 1.16 4.7 kg
CHC-20 R.35.5 63F11 35.5:1 IEC 63 · 11 mm shaft 0.25 kW 39.5 r/min 58 Nm 2.08 4.7 kg
CHC-20 R.35.5 71F14 35.5:1 IEC 71 · 14 mm shaft 0.37 kW 39.5 r/min 85 Nm 1.41 4.7 kg
CHC-20 R.35.5 80F19 35.5:1 IEC 80 · 19 mm shaft 0.55 kW 39.5 r/min 127 Nm 0.95 4.7 kg
CHC-20 R.40.1 63F11 40.1:1 IEC 63 · 11 mm shaft 0.25 kW 34.9 r/min 65 Nm 1.84 4.7 kg
CHC-20 R.40.1 71F14 40.1:1 IEC 71 · 14 mm shaft 0.37 kW 34.9 r/min 97 Nm 1.24 4.7 kg
CHC-20 R.40.1 80F19 40.1:1 IEC 80 · 19 mm shaft 0.55 kW 34.9 r/min 143 Nm 0.84 4.7 kg
CHC-20 R.45.9 63F11 45.9:1 IEC 63 · 11 mm shaft 0.25 kW 30.5 r/min 75 Nm 1.6 4.7 kg
CHC-20 R.45.9 71F14 45.9:1 IEC 71 · 14 mm shaft 0.37 kW 30.5 r/min 111 Nm 1.08 4.7 kg
CHC-20 R.45.9 80F19 45.9:1 IEC 80 · 19 mm shaft 0.55 kW 30.5 r/min 165 Nm 0.73 4.7 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

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