R Series Bevel Gear Reducer
The K series is a compact right-angle helical-bevel gear reducer designed to reduce speed and transmit torque in industrial machinery.
Product Overview
The R series is an inline helical gear reducer designed to reduce speed and transmit torque in conveyors, packaging machinery and industrial processing equipment. Its coaxial input and output arrangement provides a compact drive layout.
Published manufacturer specifications include reduction ratios from 3.21 to 289.74 for standard two- and three-stage units, with model-dependent maximum output torque reaching 20,000 Nm. Power capacity and available ratios vary by manufacturer and gearbox size.
Foot-mounted and flange-mounted versions are available, with solid output shafts and different motor connection options. Select the unit according to output speed, torque, service factor, shaft loads and mounting position.
Published manufacturer specifications include reduction ratios from 3.21 to 289.74 for standard two- and three-stage units, with model-dependent maximum output torque reaching 20,000 Nm. Power capacity and available ratios vary by manufacturer and gearbox size.
Foot-mounted and flange-mounted versions are available, with solid output shafts and different motor connection options. Select the unit according to output speed, torque, service factor, shaft loads and mounting position.
Electrical Specifications
| Parameter | Specification |
|---|---|
| Drive Configuration | Inline helical gear reducer with motor, motor adapter or shaft input |
| Motor Type | Three-Phase AC Induction Motor; other motor types available with compatible adapters |
| Rated Motor Power | 0.12–160 kW across standard and extended-bearing configurations |
| Rated Voltage | Motor options include 220–240 V, 380–400 V, 415–440 V and 660–690 V |
| Rated Frequency | 50 Hz or 60 Hz, according to the selected motor rating |
| Motor Rated Speed | Depends on motor pole count and supply frequency |
| Rated Current | Specified for the selected motor power, voltage and frequency |
| Motor Efficiency Class | Motor-dependent; IE3 packages available |
| Motor Protection Rating | IP55 motor packages available; other protection levels require confirmation |
| Insulation Class | Class F motor packages available |
| Operating Duty | S1 continuous-duty motor packages available; other duties subject to selection |
| Brake Option | Optional brake motor configuration |
| Inverter Operation | Available with a suitable motor; operating speed and torque limits require selection |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Gear Type | Inline / Coaxial Helical Gear Reducer |
| Gear Unit Size | Standard sizes include 07, 17, 27, 37, 47, 57, 67, 77, 87, 97, 107, 127, 137, 147 and 167 |
| Output Shaft | Solid keyed shaft; smooth-shaft options available on selected sizes |
| Mounting Arrangement | Foot-mounted, flange-mounted, combined foot-and-flange, or extended-bearing flange configuration |
| Shaft / Bore Diameter | Solid output shaft diameters: 16–120 mm across listed standard configurations |
| Input Connection | Integrated gearmotor, motor adapter or solid input shaft |
| Net Weight | Approx. 4–700 kg for listed standard R/RF gearboxes; motor and special configurations additional |
| Overall Dimensions | Output shaft extensions: 40–210 mm; housing dimensions vary by size and mounting arrangement |
Technical Specifications
| Mechanical Specifications | Specification |
|---|---|
| Reduction Ratio | Single-stage RX: 1.30–8.65; standard two-/three-stage R: 3.21–289.74; combined units: 90–27,001 |
| Rated Output Torque | Standard R model maximum ratings: 50–20,000 Nm; single-stage RX maximum ratings vary by manufacturer and size |
| Output Speed | At 1,450 rpm input: RX approximately 168–1,115 rpm; standard R approximately 5–452 rpm; combined units approximately 0.054–16.1 rpm |
| Permissible Input Speed | Selected according to gear unit size, ratio, thermal capacity and lubrication requirements |
| Service Factor | Selected according to load, daily operating hours, starting frequency and shock conditions |
| Gear Stages | One stage for RX; two or three stages for standard R; additional stages for combined units |
| Permissible Shaft Loads | Radial and axial load ratings depend on size, output speed and force application point |
| Lubrication | Gear oil lubrication; viscosity and fill quantity selected for operating conditions and mounting position |
| Operating Temperature | Permitted range depends on lubricant, seals, motor and thermal loading |
| Optional Features | Brake motor, reduced backlash, extended output bearing housing and combined reduction configuration |
Frequently Asked Questions
Provide the required output speed, torque, motor power, operating hours, starting frequency and mounting position. Include shock loads and radial or axial forces on the output shaft.
R series reducers use an inline arrangement, while K series reducers typically use a right-angle helical-bevel arrangement. Choose the layout that matches your equipment.
Published SEW reference ratios are 3.21–289.74 for standard two- and three-stage R units. Single-stage RX units cover 1.30–8.65. Availability depends on manufacturer and size.
Divide input speed by the reduction ratio. For example, a 1,450 rpm input and a 50:1 ratio produce a nominal output speed of 29 rpm.
Published model maximum torque reaches 18,000 Nm in Changyulong’s R/RF range and 20,000 Nm in SEW’s standard R range. Check the rating for the exact size, ratio and duty.