R Series Coaxial Helical Gearmotor – Compact Inline Drive Solution

R Series Coaxial Helical Gearmotor – Compact Inline Drive Solution

Modular coaxial helical gearmotor with integrated motor. 0.18-160kW power range, 1-3 stage options, torque up to 18000Nm. Ideal for conveyors, mixers & automation systems.

Product Introduction

The R Series represents a comprehensive range of coaxial helical gearmotors engineered for industrial automation, material handling, and process equipment applications. This inline drive solution combines precision helical gearing with integrated electric motors in a compact, space-saving configuration. Featuring modular construction across multiple mounting styles and reduction stages, these units deliver power transmission from 0.18 kW to 160 kW with torque capacities reaching 18,000 N·m. The coaxial design aligns input and output shafts on the same centerline, simplifying machine integration while maximizing power density in confined installation spaces.

Coaxial Design Advantages

Space-Efficient Inline Configuration

The coaxial architecture positions the motor and output shaft along a single axis, creating an exceptionally compact footprint compared to parallel shaft or right-angle drive alternatives. This inline arrangement reduces the overall length and width requirements, proving invaluable in machinery designs where mounting space is limited. The streamlined profile facilitates integration into conveyor frames, mixer supports, and automated equipment where traditional gearbox configurations would require extensive structural modifications.

Input and output shaft alignment on the same centerline eliminates the offset loads typical of non-coaxial designs. This balanced configuration reduces bearing loads and extends component service life, particularly in applications experiencing frequent starts, stops, or direction reversals. The symmetric load distribution enables higher torque capacity within equivalent housing dimensions, maximizing power density for demanding industrial applications.

Cast Iron Housing Construction

High-grade cast iron housing provides the structural rigidity necessary for precise gear alignment under sustained operational loads. The material’s excellent vibration damping characteristics reduce noise transmission to mounting structures, creating quieter operational environments in production facilities. Cast iron’s dimensional stability across temperature variations maintains gear mesh accuracy throughout thermal cycles, ensuring consistent efficiency and minimizing wear rates.

Precision-machined mounting surfaces facilitate accurate installation on both foot-mounted and flange-mounted configurations. Internal ribbing patterns reinforce critical load-bearing areas while creating optimized lubricant circulation pathways. The robust housing design accommodates the high radial and axial loads generated during power transmission, with generous safety factors ensuring reliable performance throughout extended service intervals.

Modular System Versatility

Comprehensive Model Range

Eight distinct series configurations address diverse application requirements and mounting preferences:

R Series (Foot-Mounted with Motor): Standard configuration from R18 through R168, providing 2-stage or 3-stage reduction with integrated motors. Ideal for horizontal conveyors, mixer drives, and general industrial machinery requiring solid foundation mounting.

RS Series (Foot-Mounted, Solid Shaft Input): Accepts power from separate drive sources via solid input shaft, enabling coupling to specialized motors, hydraulic motors, or existing drive equipment. Suitable for retrofit applications or systems requiring non-standard prime movers.

RF Series (Flange-Mounted with Motor): Flange mounting from RF18 through RF168 eliminates foot-mounted base requirements, enabling direct attachment to machine housings or motor brackets. Space-saving design suits compact equipment and vertical mounting orientations.

RFS Series (Flange-Mounted, Solid Shaft Input): Combines flange mounting convenience with solid input shaft flexibility, accommodating custom motor selections or alternative power sources in space-constrained installations.

RX Series (Single-Stage, Foot-Mounted): Single-stage configuration from RX38 through RX158 provides lower reduction ratios with higher efficiency, suitable for applications requiring moderate speed reduction with minimal power loss.

RXS Series (Single-Stage, Foot-Mounted, Solid Shaft Input): Single-stage design accepting external drive sources, offering maximum efficiency for applications where precise ratio matching from separate motor selection is required.

RXF Series (Single-Stage, Flange-Mounted): Single-stage flange mounting combines efficiency advantages with space-saving installation, ideal for compact machinery requiring direct equipment attachment.

RXFS Series (Single-Stage, Flange-Mounted, Solid Shaft Input): Ultimate flexibility combining single-stage efficiency, flange mounting, and solid input shaft for specialized applications requiring custom drive integration.

RM Series (Agitator Gearboxes): Specially engineered for mixing and agitation applications, featuring reinforced output shaft design to withstand the radial loads imposed by agitator impellers. Optimized for liquid mixing, chemical processing, and pharmaceutical manufacturing equipment.

Reduction Stage Options

Single-Stage Configuration (RX Series): Ratios from 1.3 to 6.65 provide efficiency up to 98%, suitable for applications requiring minimal speed reduction with maximum power transfer efficiency. Single-stage designs minimize component count, reducing maintenance requirements and potential failure points.

Two-Stage and Three-Stage Options (R Series): Ratios from 3.37 to 289.63 accommodate applications requiring substantial speed reduction and high torque multiplication. Multiple reduction stages achieve greater ratios within compact housing dimensions, enabling direct motor operation at optimal speeds without requiring additional gear reduction stages.

Motor Integration Flexibility

Comprehensive Motor Compatibility

The modular design accommodates diverse motor types, enabling precise matching to application requirements:

Single-Phase AC Motors: Suitable for light-duty applications and installations where three-phase power is unavailable. Common in small conveyors, mixer drives, and portable equipment requiring 110V or 220V single-phase operation.

Three-Phase AC Motors: Standard industrial power source providing reliable performance across the complete power range. Optimal for continuous duty applications in manufacturing, material handling, and process industries.

Brake Motors: Integrated electromagnetic brakes provide immediate stopping when power disconnects, essential for vertical conveyors, hoists, and positioning applications requiring precise load holding without drift.

Inverter Motors: Variable frequency drive (VFD) compatible motors enable precise speed control, accommodating processes requiring variable belt velocities, adjustable mixing speeds, or programmable motion profiles. Enhanced cooling designs withstand low-speed operation under VFD control.

Multi-Speed Motors: Dual or triple-speed motor windings provide discrete speed selections without external controls, suitable for applications requiring limited speed adjustment such as two-speed conveyors or adjustable mixers.

Explosion-Proof Motors: ATEX or hazardous location certified motors enable operation in environments with combustible dust, flammable vapors, or explosive atmospheres. Essential for chemical processing, grain handling, and petrochemical facilities.

Roller Motors: Specialized drum motor configuration integrates the entire drive assembly within conveyor rollers, creating self-contained drive units for modular conveyor systems requiring distributed drive power.

Input Configuration Options

Integrated Motor Mounting: Direct motor attachment via precision-machined motor flange eliminates couplings and alignment procedures. IEC and NEMA standard flanges accommodate global motor sourcing, with adapter configurations available for non-standard motors.

Solid Shaft Input (S Series variants): Keyed solid input shaft accepts flexible couplings, belt drives, or chain drives from separate power sources. This configuration suits applications requiring remote motor mounting, special prime movers, or existing drive equipment reuse during upgrades.

Technical Specifications

Two-Stage and Three-Stage Models (R/RF Series)

Model	Output Shaft	Input Shaft	Power (kW)	Ratio Range	Max Torque (Nm)
R/RF18	Ø20mm	–	0.18-0.75	3.83-74.84	85
R/RF28	Ø25mm	Ø16mm	0.18-3	3.37-135.09	130
R/RF38	Ø25mm	Ø16mm	0.18-3	3.41-134.82	200
R/RF48	Ø30mm	Ø19mm	0.18-5.5	3.83-176.88	300
R/RF58	Ø35mm	Ø19mm	0.18-7.5	4.39-186.89	450
R/RF68	Ø35mm	Ø19mm	0.18-7.5	4.29-199.81	600
R/RF78	Ø40mm	Ø24mm	0.18-11	5.21-195.24	820
R/RF88	Ø50mm	Ø28mm	0.55-22	5.36-246.54	1,550
R/RF98	Ø60mm	Ø38mm	0.55-30	4.49-289.63	3,000
R/RF108	Ø70mm	Ø42mm	2.2-45	5.06-245.54	4,300
R/RF138	Ø90mm	Ø55mm	5.5-55	5.51-223.34	8,000
R/RF148	Ø110mm	Ø55mm	11-90	5.00-163.46	13,000
R/RF168	Ø120mm	Ø70mm	11-160	8.77-196.41	18,000

Single-Stage Models (RX/RXF Series)

Model	Output Shaft	Input Shaft	Power (kW)	Ratio Range	Max Torque (Nm)
RX/RXF38	Ø20mm	Ø16mm	0.18-1.1	1.6-3.76	20
RX/RXF58	Ø20mm	Ø19mm	0.18-5.5	1.3-5.5	70
RX/RXF68	Ø25mm	Ø19mm	0.18-7.5	1.4-6.07	135
RX/RXF78	Ø30mm	Ø24mm	1.1-11	1.42-5.63	215
RX/RXF88	Ø40mm	Ø28mm	3-22	1.39-6.44	400
RX/RXF98	Ø50mm	Ø38mm	5.5-30	1.42-5.82	600
RX/RXF108	Ø60mm	Ø42mm	7.5-45	1.44-6.65	830
RX/RXF128	Ø75mm	Ø55mm	7.5-90	1.56-6.47	1,110
RX/RXF158	Ø90mm	Ø70mm	11-132	1.63-6.22	1,680

Industrial Applications

Conveyor Systems

Belt conveyors, roller conveyors, and chain conveyors throughout manufacturing and distribution facilities rely on R Series gearmotors for primary drive power. The inline configuration simplifies installation under conveyor frames where vertical clearance is limited. Foot-mounted models suit conventional installations, while flange-mounted variants enable direct attachment to conveyor support structures, reducing component count and installation complexity.

Variable speed capabilities through inverter motor integration accommodate production lines requiring adjustable belt velocities for different product types or processing rates. Brake motor options provide immediate stopping for indexing conveyors, accumulation zones, or applications requiring precise positioning without coast-down distance.

Mixing and Agitation Equipment

The RM Series specifically addresses mixing applications in chemical processing, pharmaceutical manufacturing, and food production. Reinforced output shafts withstand the radial loads imposed by agitator impellers, with housing designs accommodating various impeller configurations and tank mounting arrangements. Coaxial design positions the motor directly above the mixing vessel, minimizing floor space requirements in process areas where multiple reactors concentrate in limited facility footprints.

Explosion-proof motor options enable operation in hazardous atmospheres where combustible materials or flammable solvents create explosive risk. Sealed housing construction protects internal components from chemical exposure, with corrosion-resistant coatings available for severe environments involving acids, caustics, or aggressive chemical atmospheres.

Automated Machinery

Packaging equipment, assembly automation, and material handling robots utilize R Series drives for precise motion control. The compact footprint enables integration within machine frames where space constraints prevent traditional gearbox installations. Single-stage models provide efficient power transmission for high-speed operations, while multi-stage configurations deliver the torque multiplication necessary for heavy-load manipulation.

Multi-speed motor options suit applications requiring discrete operational modes, such as packaging machines with setup and production speeds, or automated assembly systems with index and process cycles. The modular design facilitates maintenance during scheduled downtime, with standardized replacement units minimizing spare parts inventory and reducing mean time to repair.

Material Handling Equipment

Bucket elevators, screw conveyors, and transfer systems depend on reliable gearmotor performance for continuous material transport. The robust construction withstands the demanding duty cycles typical of bulk handling, where frequent starts under load and impact conditions challenge drive components. High torque capacity suits applications moving heavy aggregates, grain, chemicals, and industrial materials requiring substantial starting torque.

The combination capability with other gearbox series (K, F, S, UDL) enables complex drive train configurations for specialized material handling equipment. Engineers can combine multiple reduction stages to achieve extreme ratios, or integrate with other gearbox types to obtain specific output orientations and mounting configurations not achievable with standard R Series models alone.

System Integration Capabilities

Gearbox Combination Options

The modular design enables series connection with complementary gearbox types, expanding application possibilities:

R + K Series Combination: Integrating helical-bevel gearboxes creates right-angle drive configurations, enabling horizontal motor mounting with vertical output orientation suitable for conveyor drives and elevator applications.

R + F Series Combination: Adding parallel shaft gearboxes achieves extreme reduction ratios exceeding 10,000:1 for specialized low-speed, high-torque applications such as extruders, mixers, and heavy-duty conveyors.

R + S Series Combination: Combining with helical-worm units provides compact right-angle drives with self-locking capabilities, ideal for vertical positioning applications requiring load holding without external brakes.

R + UDL Series Combination: Integrating stepless variators enables infinitely variable speed control without electronic controls, suitable for applications requiring continuous speed adjustment across wide ranges.

These combination configurations maintain the coaxial input design of the R Series primary stage, preserving the motor integration advantages while expanding output configuration possibilities. Standard interface dimensions facilitate field assembly of combined units, or factory-assembled combinations ship as complete drive packages ready for installation.

Lubrication and Maintenance

Oil-Bath Splash System

The gearmotor employs proven oil-bath splash lubrication where rotating gears distribute lubricant throughout the gear chamber. This passive system operates without pumps or circulation equipment, maximizing reliability while eliminating potential failure points. Internal oil pathways ensure proper bearing lubrication, while splash patterns created during operation coat all gear surfaces with protective oil film.

Standard industrial gear oils suit most applications, with synthetic lubricants available for extreme temperature environments or applications requiring extended oil change intervals. Initial factory fill provides complete protection, with service intervals determined by operating conditions, typically ranging from 4,000 to 8,000 hours depending on duty cycle and ambient temperature.

Natural Cooling Design

Heat dissipation occurs through natural convection from the cast iron housing surfaces. External ribbing patterns increase effective cooling area, enhancing thermal transfer efficiency without requiring forced-air cooling or liquid cooling systems. This passive approach eliminates cooling fans and associated maintenance requirements, while reducing energy consumption and noise generation.

The thermal mass of the cast iron housing absorbs operational heat spikes during heavy loads or frequent starts, stabilizing internal temperatures and protecting lubricant properties. Even during continuous operation under rated loads, natural cooling maintains oil temperatures within acceptable limits, preserving viscosity characteristics and lubrication effectiveness throughout extended duty cycles.

Installation and Mounting

Foot-Mounted Configuration

Standard foot-mounted designs provide stable support on horizontal surfaces, with precision-machined mounting feet ensuring accurate alignment on foundation plates or equipment frames. Standard bolt patterns accommodate various foundation designs, with adjustable mounting options available for installations requiring fine position adjustment.

Foot mounting suits applications where gearmotor weight transfer directly to supporting structures is preferred, such as heavy-duty conveyor drives or stationary equipment installations. The low center of gravity enhances stability during operation, reducing vibration transmission to mounting surfaces.

Flange-Mounted Configuration

Flange mounting eliminates separate base plates, enabling direct attachment to machine housings, motor brackets, or equipment flanges. This configuration reduces installation height, valuable in applications with vertical clearance constraints. Standard flange patterns match industry conventions, simplifying integration with existing equipment during upgrades or replacements.

Flange mounting proves particularly advantageous for vertical or inclined installations where gravity loads would challenge foot-mounted configurations. The rigid flange connection handles the axial thrust loads common in vertical drives, eliminating the need for separate thrust bearings or load support structures.

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Quick Specifications Summary

Parameter	Specification
Power Range	0.18 ~ 160 kW
Torque Range	20 ~ 18,000 N·m
Ratio Range	1.3 ~ 289.63
Stages Available	1-stage, 2-stage, 3-stage
Housing Material	Cast Iron
Gear Type	Helical Profile
Output Type	Solid Shaft
Motor Options	Single/Three-phase, Brake, Inverter, Multi-speed, Explosion-proof, Roller
Mounting Types	Foot-Mounted, Flange-Mounted
Input Options	Integrated Motor, Solid Shaft Input
Lubrication	Oil-bath & Splash System
Cooling	Natural Convection
Combination	Compatible with K, F, S, UDL Series

For detailed selection guidance or custom configuration requirements, consult our application engineering team.