What is the difference between H series and B series in the HB gearbox?

The H series uses parallel shaft helical gearing, where input and output shafts are parallel. The B series uses a right-angle helical bevel configuration, where input and output shafts are perpendicular. Both share the same modular housing platform. H series ratio range is 1.25:1 to 450:1; B series is 5:1 to 400:1. H series is suited to inline drives while B series is used where the motor must be positioned at 90 degrees to the driven shaft.

What is the maximum torque and power of the HB Series gearbox?

The HB Series covers output torque up to 950 kN.m (950,000 N.m). Input power ranges from 2.8 kW to 5000 kW depending on series and size. H series covers 4 to 5000 kW; B series covers 2.8 to 3000 kW. There are 23 standard sizes from 3 to 26, with 1 to 4 reduction stages.

What materials and gear finishing does the HB gearbox use?

Gears are machined from high-strength alloy steel, carburized to a controlled case depth, hardened, and profile-ground with special tooth geometry modification for increased contact ratio. Bevel gears are hardened and ground spiral bevel type. The housing is close-grain cast iron for standard sizes, with welded steel plate for the largest sizes. This combination gives approximately 98.5% efficiency per helical gear pair and 97.5% per bevel gear pair.

What output shaft and mounting options are available?

Output configurations include keyed solid shaft, keyed hollow shaft, hollow shaft with shrink disk, involute spline shaft, and solid shaft with output flange. Mounting options are foot-mounted (horizontal), flange-mounted, swing base-mounted, and torque-arm-mounted. Input accepts IEC-normalized motor connection flange or keyed solid shaft. Forced lubrication is available for vertical mounting and high-speed applications.

Can Raydafon customize the HB Series gearbox for OEM applications?

Yes. Raydafon offers OEM customization on reduction ratio, shaft dimensions, flange type, mounting configuration, output type (solid shaft, hollow shaft, shrink disk, spline or flange), and lubrication system (oil bath, forced lubrication, external cooler). Send the required torque, ratio, input power, shaft configuration and mounting constraints for a quotation. MOQ depends on the specific modification.

What is the lead time and MOQ for the HB Series gearbox?

Standard configurations ship in 15 to 30 days. MOQ is 1 unit for standard configurations. Custom ratios, shaft configurations and mounting types are confirmed at quotation. Raydafon is based in Ningbo, China and supplies wholesale and OEM quantities worldwide. Payment terms, shipping method and Incoterms are confirmed at order.

What industries use the HB Series heavy-duty gearbox?

The HB Series is specified in mining and aggregate (crusher drives, conveyor head drives), cement and lime (kiln drives, raw mill drives), steel and metallurgy (rolling mill drives, continuous casting), chemical and petrochemical (reactor agitator drives, extruder drives), power generation (coal mill drives, cooling tower fan drives), material handling (bulk conveyor drives, stacker/reclaimer drives), and water treatment (clarifier and thickener drives).

How does the HB Series compare to a standard helical gearbox?

The HB Series is designed for higher power and torque than a standard helical gearbox. While a standard BRC or PC series helical gearbox covers 0.12-4 kW with torque up to 491 N.m, the HB Series covers 2.8-5000 kW with torque up to 950 kN.m — roughly 2000 times the torque capacity. The HB Series also offers modular conversion between parallel-shaft and right-angle configurations, forced lubrication options, and larger housing surface area for heat dissipation in continuous heavy-duty service.

English

English

HB Series Heavy-duty Industrial Gearbox

HB Series Heavy-Duty Industrial Gearbox is a rigid tooth flank gear unit designed for high-power, high-torque industrial drive applications. Raydafon supplies two sub-series: H series parallel shaft helical gear units covering sizes 3 to 26, and B series right-angle helical bevel gear units covering the same size range. Both series use 1 to 4 reduction stages with ratios from 1.25:1 to 450:1 and output torque up to 950 kN.m. Input power ranges from 2.8 kW to 5000 kW. Gears are carburized from high-strength alloy steel, hardened and profile-ground. The modular housing design allows horizontal mounting, vertical mounting, and conversion between parallel-shaft and right-angle configurations using a common housing. Input options include IEC-normalized motor flange and keyed solid shaft. Output options include keyed solid shaft, keyed hollow shaft, hollow shaft with shrink disk, and involute spline shaft. Mounting options include foot-mounted, flange-mounted, swing base-mounted and torque-arm-mounted. Applications include mining, cement, steel, chemical, power generation and material handling. OEM customization on ratio, shaft, flange and mounting configuration.

Send Inquiry

Product Description

Raydafon · H & B Series · Rigid Tooth Flank Heavy-Duty Gear Unit

HB Series Heavy-Duty Industrial Gearbox — H Parallel Shaft & B Right-Angle Helical Bevel, Ratio 1.25:1 to 450:1, Torque up to 950 kN.m

The HB Series Heavy-Duty Industrial Gearbox is a rigid tooth flank gear unit engineered for high-power, high-torque industrial drive applications. Raydafon supplies two sub-series: H series parallel shaft helical gear units and B series right-angle helical bevel gear units. Both series share a common modular housing design — the same housing can be configured for parallel-shaft or right-angle output, which reduces the number of spare parts a plant needs to stock.

Gears are carburized from high-strength alloy steel, hardened and profile-ground. The H series uses helical gear pairs throughout, while the B series uses a combination of helical gear pairs and spiral bevel gear pairs for the right-angle stage. Gear cases are manufactured in close-grain cast iron (or welded steel plate for the largest sizes) for vibration absorption and low noise. The series is designed for horizontal mounting, vertical mounting and swing base mounting, with torque-arm mounting available for shaft-mounted configurations.

Ratio1.25-450:1

Torque950kN.m

Power2.8-5000kW

Size Range3-26

Stages1-4

H Series Parallel Shaft vs B Series Right-Angle — Configuration Selection

Series Comparison

The HB Series covers two distinct shaft configurations within a common modular housing platform. The H series uses parallel shaft helical gearing, where input and output shafts are parallel. The B series uses a right-angle helical bevel configuration, where the input and output shafts are perpendicular. Choosing between them is primarily a question of machine layout — whether the drive must turn the power through 90 degrees or can run straight through.

H series vs B series — configuration comparison
Parameter	H Series	B Series
Gear Type	Parallel shaft helical gear pairs	Helical gear pairs + spiral bevel gear pairs
Shaft Configuration	Input and output shafts parallel	Input and output shafts at 90 degrees
Size Range	3 to 26	3 to 26
Reduction Stages	1 to 4	1 to 4
Ratio Range	1.25:1 to 450:1	5:1 to 400:1
Output Torque	2 to 900 kN.m	5.8 to 900 kN.m
Input Power	4 to 5000 kW	2.8 to 3000 kW
Gear Efficiency	98.5% per helical gear pair	97.5% per bevel gear pair, 98.5% per helical pair
Best Suited For	Inline drives, conveyors, pumps, mixers where shaft alignment is parallel	Right-angle drives, crushers, extruders, kiln drives where the motor must be perpendicular to the driven shaft

HB Series Technical Data — Full Specification

Engineering Reference

The table below lists the complete technical specification of the HB Series Heavy-Duty Industrial Gearbox. For a replacement or OEM application, confirm the required output torque, ratio, input power, mounting configuration and output shaft type against the machine drawing before ordering.

Complete specification — HB Series heavy-duty industrial gearbox
Parameter	Specification
Gearbox Type	Rigid tooth flank heavy-duty industrial gear unit
Series	H series (parallel shaft helical), B series (right-angle helical bevel)
Size Range	3 to 26 (23 standard sizes)
Reduction Stages	1, 2, 3 or 4 stages
Ratio Range (H Series)	1.25:1 to 450:1
Ratio Range (B Series)	5:1 to 400:1
Output Torque (H Series)	2 to 900 kN.m (2000 to 900000 N.m)
Output Torque (B Series)	5.8 to 900 kN.m (5800 to 900000 N.m)
Input Power (H Series)	4 to 5000 kW
Input Power (B Series)	2.8 to 3000 kW
Max Input Speed	1500 rpm standard, up to 3000 rpm with forced lubrication
Gear Material	High-strength alloy steel, carburized and hardened
Gear Finishing	Profile ground, special tooth geometry modification for high contact ratio
Bevel Gear Finishing	Hardened and ground spiral bevel
Housing Material	Close-grain cast iron (standard), welded steel plate (large sizes)
Housing Design	Sound-absorbing structure, large surface area for heat dissipation
Lubrication	Oil bath + forced lubrication combination, external cooler and oil temperature/pressure/flow protection available
Cooling	Large fan with new deflector shroud, external cooler available
Sealing	Non-contact labyrinth seal standard, oil seals on output shafts
Input Configuration	IEC-normalized motor connection flange / keyed solid shaft input
Output Configuration	Keyed solid shaft / keyed hollow shaft / hollow shaft with shrink disk / involute spline shaft / solid shaft with flange
Mounting	Foot-mounted (horizontal) / flange-mounted / swing base-mounted / torque-arm-mounted
Certification	ISO 9001 manufacturing system, CE available
Customization	Ratio, shaft dimensions, flange type, mounting configuration, output type, lubrication system
Origin	Ningbo, China

HB series heavy duty industrial gearbox H series parallel shaft helical configuration — **HB Series Gearbox — Housing Structure and Shaft Configuration** The modular housing accepts both parallel-shaft (H series) and right-angle (B series) gear trains. The same housing casting is used across both configurations, with the internal gear set and bearing arrangement determining whether the output shaft runs parallel or perpendicular to the input. The large housing surface area and fan shroud work together to dissipate heat generated by the gear meshing.

Why Specify the Raydafon HB Series Heavy-Duty Gearbox?

Design Advantages

Six design characteristics separate the HB Series from a commodity industrial gearbox. Each one addresses a specific failure mode in heavy-duty drive applications.

Carburized and Profile-Ground Gears

Gears are machined from high-strength alloy steel, carburized to a controlled case depth, hardened, then profile-ground. The special tooth geometry modification achieves a larger tooth contact ratio than a standard involute profile, which distributes load across more teeth simultaneously. This reduces contact stress and extends gear life in continuous-duty applications.

Modular Housing — Parallel Shaft and Right-Angle from One Platform

The housing is designed as a common platform. The same casting serves both H series parallel-shaft and B series right-angle configurations. For plant maintenance, this means a single spare housing can replace either type, and the number of distinct spare parts is significantly reduced compared to dedicated housings for each configuration.

98.5% Helical / 97.5% Bevel Gear Efficiency

The H series achieves approximately 98.5% efficiency per helical gear pair. The B series achieves approximately 97.5% per bevel gear pair and 98.5% per helical pair. On a 1000 kW continuous-duty drive running 6000 hours per year, a 1% efficiency difference translates to roughly 60,000 kWh of electricity — a measurable operating cost reduction over the gearbox service life.

Sound-Absorbing Housing with Large Cooling Surface

The close-grain cast iron housing absorbs vibration more effectively than a welded steel fabrication. Combined with the large housing surface area and the fan/deflector shroud, the HB Series runs cooler and quieter than a conventional gearbox of the same power rating. External coolers and forced lubrication are available for high-speed or high-ambient-temperature applications.

Five Output Configurations — Shaft, Hollow, Shrink Disk, Spline, Flange

Output options include keyed solid shaft, keyed hollow shaft, hollow shaft with shrink disk, involute spline shaft, and solid shaft with output flange. The shrink disk option eliminates the keyway stress concentration and provides a friction connection that is easier to remove after years of service. The involute spline option handles higher torque in a smaller diameter than a keyed connection.

ISO 9001 Manufacturing and Full Traceability

Every unit is assembled under an ISO 9001 quality system. Gear tooth profile, case depth, housing bore concentricity and bearing fit are inspected in process. Each unit receives a run-in test with oil temperature monitoring before packing. Batch material certificates are retained and available with the shipment.

HB series heavy duty industrial gearbox internal gear layout helical bevel stage — **Internal Layout — Helical and Bevel Gear Stages** The H series contains one to four helical gear stages depending on the required ratio. The B series adds a spiral bevel stage for the right-angle turn, then one to three helical stages. Bearings are premium tapered roller or spherical roller types selected for the combined radial and axial loads the gearbox sees in service. Forced lubrication is used for vertical mounting and high-speed applications where splash lubrication alone is insufficient.

Where the HB Series Heavy-Duty Gearbox Is Used

Applications

The HB Series is specified wherever a high-power, high-torque gearbox is required for continuous industrial duty. The applications below are the ones most often quoted on a Raydafon HB Series enquiry.

Mining & Aggregate

Crusher drives, conveyor head drives and mill drives where the gearbox must survive shock loads and abrasive dust.

Cement & Lime

Kiln drives, raw mill drives and clinker cooler drives where high torque at low speed is required continuously.

Steel & Metallurgy

Rolling mill drives, ladle transfer drives and continuous casting equipment where reliability under high temperature is critical.

Chemical & Petrochemical

Reactor agitator drives, extruder drives and pump drives where the gearbox must handle viscous loads and corrosive environments.

Power Generation

Coal mill drives, ash handling drives and cooling tower fan drives where continuous duty and minimal maintenance are required.

Material Handling

Bulk conveyor drives, bucket elevator drives and stacker/reclaimer drives where the gearbox transmits high torque over long distances.

Water & Wastewater

Clarifier drives, thickener drives and large pump drives where the gearbox must operate in humid or outdoor environments.

OEM Heavy Machinery

Wholesale and OEM supply for heavy machinery builders who need a standard heavy-duty gearbox integrated into a production line.

How to Order the HB Series Heavy-Duty Gearbox

Ordering Inputs

To confirm the correct H or B series model and issue a wholesale or OEM quotation, Raydafon needs the five items below. For a replacement unit, the original gearbox nameplate data or a dimensioned drawing is usually sufficient.

Send These Five Details for an HB Series Quotation

Send the five items below and Raydafon will confirm the model, ratio, mounting and lead time within one working day.

01Required output torque (kN.m or N.m) and output speed (rpm)

02Required reduction ratio or input/output speed combination

03Motor interface: IEC frame size, power (kW) or solid shaft input dimensions

04Shaft configuration: H parallel shaft or B right-angle

05Mounting type, output shaft type and quantity required

Talk to Raydafon About Your Heavy-Duty Gearbox Requirement

Whether you are replacing a worn heavy-duty gearbox in a mining or cement plant, specifying a new drive for an OEM machine build, or sourcing H/B series gearboxes in wholesale volume, Raydafon can quote to your ratio, torque, power, shaft configuration, mounting and output requirements. OEM and project quantities supplied directly from the Ningbo factory. ISO 9001 certified.

Send Inquiry Contact Sales

Related Category