VRB Series Inline Planetary Gearbox

The VRB Series inline planetary gearbox is designed for servo-driven automation systems requiring compact installation, high torque transmission, stable positioning, and reliable motion control. It is suitable for CNC machines, robotics, packaging machinery, automation equipment, and precision industrial drive systems.

Request a Quote View Specifications

Key Advantages of VRB Series

Inline Structure

Coaxial input and output design for compact servo transmission layouts.

High Torque Density

Stable torque output in limited installation space.

Precision Motion

Suitable for positioning, indexing, feeding, and speed control.

Servo Motor Matching

Supports common servo motor interfaces for industrial automation.

Ordering Code Representation

The VRB model code defines the gearbox series, frame size, ratio, motor shaft diameter, motor pilot diameter, motor mounting hole pitch, screw size, and reducer output shaft diameter.

VRBSeries
VRB / VRBR

90Frame Size
60 / 90 / 120 / 140 / 180

5Ratio
L1: 3–10
L2: 12–100

19Motor Shaft Diameter

70Motor Pilot Diameter

90Motor Mounting Hole Pitch

M6Motor Mounting Screw Size

C22Reducer Output Shaft Diameter

Example: VRB-90-5-19-70-90-M6-C22. Final configuration should be confirmed according to the servo motor and installation requirements.

Motor Interface and Installation Dimensions

Before ordering, please confirm the servo motor interface and reducer output dimensions. These values affect the matching between the motor, flange, shaft, and gearbox input side.

Motor Shaft Diameter

Confirm the motor shaft diameter before selecting the input bore size.

Motor Pilot Diameter

The pilot diameter helps align the servo motor and reducer accurately.

Mounting Hole Pitch

Check the motor mounting hole distance to match the adapter flange.

Output Shaft Diameter

Select the reducer output shaft according to the driven mechanism.

Reducer Operating Condition Selection Table

The service factor should be selected according to load type, starts per hour, and daily operating time. For continuous operation or large output inertia, a larger gearbox model may be recommended.

Load Type	Starts per Hour (Z)	h < 4	4 ≤ h < 8	8 ≤ h < 12	12 ≤ h < 16	16 ≤ h < 24
Even and Stable Load	Z ≤ 10	0.9	1.0	1.1	1.4	1.8
	10 ≤ Z ≤ 30	1.0	1.2	1.3	1.6	2.0
	30 ≤ Z ≤ 100	1.2	1.4	1.5	1.8	2.2
Medium Shock Load	Z ≤ 10		1.4	1.5	1.8	2.2
	10 ≤ Z ≤ 30	1.4	1.6	1.65	2.0	2.5
	30 ≤ Z ≤ 100	1.6	1.8	2.0	2.2	2.8
Heavy Shock Load	Z ≤ 10	1.6	1.8	2.2	2.2	2.8
	10 ≤ Z ≤ 30	1.8	2.0	2.4	2.4	3.0
	30 ≤ Z ≤ 100	2.0	3.0	2.7	2.7	3.3

When the output inertia is large, please increase the selection by one frame size. Continuous operation may reduce working life.

Reducer Performance Parameter Table

The following data summarizes the VRB Series inline planetary gearbox range. Detailed selection should be confirmed according to ratio, torque, speed, load condition, and servo motor model.

Item	Unit	Ratio	VRB60	VRB90	VRB120	VRB140	VRB180
Frame Sizes	–	–	60	90	120	140	180
Ratio Range	–	–	L1: 3–10 / L2: 12–100
Rated Output Torque T2N	N·m	3	55	130	208	430	720
Rated Output Torque T2N	N·m	4	60	160	330	650	1200
Rated Output Torque T2N	N·m	5	60	160	330	650	1200
Rated Output Torque T2N	N·m	7	50	140	300	550	1100
Rated Output Torque T2N	N·m	10	45	100	170	390	650
Maximum Output Torque T2B	N·m	3–100	2.5 × rated torque
Rated Input Speed n1N	rpm	3–100	4000	4000	4000	3000	3000
Maximum Input Speed n1B	rpm	3–100	8000	8000	8000	6000	6000
Helical Gear Precision Clearance P2	arcmin	L1	≤3–5	≤2–4	≤2–4	≤2–4	≤3–5
Helical Gear Precision Clearance P2	arcmin	L2	≤5–7	≤4–6	≤4–6	≤4–6	≤5–7
Torsional Rigidity	N·m/arcmin	3–100	7	14	25	50	145
Allowable Radial Force F1	N	3–100	1530	3250	6700	9400	14500
Allowable Axial Force F2	N	3–100	765	1625	3350	4700	7250
Service Life	hr	3–100	30000 h continuous operation
Efficiency η	%	L1	≥97%
Efficiency η	%	L2	≥94%
Weight	kg	L1	1.3	3.4	8.2	15.5	30
Weight	kg	L2	1.5	4	9.3	16.5	33
Noise	dB	3–100	≤56	≤60	≤60	≤63	≤67
Protection Level	–	3–100	IP65
Installation Method	–	3–100	Arbitrary
Operating Temperature	℃	3–100	-10℃ to +90℃

Moment of Inertia of Reducer

Moment of inertia is important for servo motor matching, acceleration, deceleration, and positioning control.

Series	Ratio	VRB60	VRB90	VRB120	VRB140	VRB180
L1 / kg·cm²	3	0.23	0.97	2.95	9.86	28.9
	4	0.18	0.67	2.87	7.54	25.03
	5	0.17	0.65	2.71	7.42	23.29
	7	0.14	0.60	2.62	7.14	22.48
	10	0.14	0.58	2.57	7.03	22.51
L2 / kg·cm²	16	0.18	0.65	0.58	2.8	7.42
	20–35	0.17	0.6	0.47	2.71	7.06
	40–100	0.04	0.58	0.44	2.57	7.06

Outline Dimensional Drawing

The outline dimensional drawing provides detailed information on the installation envelope, input and output structure, shaft dimensions, flange sizes, and mounting hole positions. High-resolution drawings ensure accurate integration with servo motors and industrial equipment.

VRB60 VRB90 VRB120 VRB140 VRB180

VRB90 inline planetary gearbox outline dimensional drawing

Click the drawing to view the full-resolution image.

Typical Applications

VRB Series inline planetary gearboxes are suitable for machines requiring compact coaxial drive, stable torque transmission, and precise servo motion control.

CNC Machines

Used in feed axes, tool changers, auxiliary positioning systems, and rotary fixtures.

View CNC Applications

Robotics

Suitable for robot arms, grippers, linear modules, and servo positioning systems.

View Robotics Applications

Automation Equipment

Applied in assembly machines, transfer systems, inspection equipment, and indexing units.

View Automation Applications

Packaging Machinery

Used in feeding, labeling, sealing, synchronized motion, and packaging line transmission systems.

View Packaging Applications

How to Select a VRB Planetary Gearbox

Before selecting a VRB inline planetary gearbox, confirm required output torque, reduction ratio, backlash level, servo motor frame size, shaft diameter, flange size, input speed, radial load, axial load, duty cycle, and available installation space. For high-frequency operation or shock load conditions, a larger frame size may be recommended.

Related Planetary Gearbox Series

Need Help Selecting a VRB Gearbox?

Send your motor model, torque requirement, speed ratio, installation space, and load condition. Our team can help recommend a suitable VRB inline planetary gearbox.