B Type Large Bore Flexible Jaw Coupling

B Type Large Bore Flexible Jaw Coupling

The B Type Large Bore Flexible Jaw Coupling uses steel hub sleeves to accommodate bore diameters up to Ø220 mm, making it the preferred choice for heavy-load drive units including hoists, rolling mills, and construction machinery. Nominal torque ranges from 10 to 18,650 N·m with a compact, low-inertia design that shares the standard A Type spider element.

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B Type Large Bore Flexible Jaw Coupling

Steel-sleeved heavy-duty jaw coupling engineered for hoists, rolling mills, and construction machinery — handling bore diameters up to Ø220 mm at torques up to 18,650 N·m.

Why Choose the B Type Over a Standard Jaw Coupling?

When shaft diameters exceed the bore capacity of standard cast-iron jaw coupling hubs, the B Type Large Bore Flexible Jaw Coupling provides the solution. By integrating precision steel sleeves into the hub body, the B Type achieves bore capacities up to Ø220 mm — making it particularly well suited to the large-shaft drives found in hoisting equipment, rolling mills, and heavy construction machinery.

Despite its heavy-duty capability, the B Type retains the same compact, low-inertia profile as the A Type. The outer dimensions and spider interface are compatible across corresponding size designations, meaning engineering teams can select the appropriate hub style based on bore requirement alone — simplifying procurement and spare parts management.

The polyurethane spider element provides torsional flexibility, damping cyclic torque pulses generated by reciprocating or variable-load drives while simultaneously accommodating shaft misalignment within specified limits. Hardness options of 92 ShA (standard) and 98 ShA (high-torque, +70% torque capacity) allow the same hub assembly to serve a broader range of load conditions.

B Type Large Bore Flexible Jaw Coupling with steel hub sleeves for heavy industrial drives

Engineering Advantages of the B Type Design

Steel Sleeve Hub Construction

The steel sleeve allows a larger bore to be machined within the same outer hub diameter, without the wall-thickness limitations imposed by cast iron or aluminium. This is the defining difference from the A Type and the reason the B Type is specified for heavy-load drive units.

Suitable for Larger Installation Apertures

The B Type is dimensioned for installation locations where the available aperture is larger than standard — such as machine frames sized for future capacity expansion. This avoids the need for adapter plates or housing modifications.

Compact Design, Low Moment of Inertia

Despite the step up in bore capacity, the B Type's rotational inertia remains low relative to its torque rating — an important consideration for drives with frequent start-stop cycles or rapid load reversals.

Shared Spider Inventory with A Type

The elastomeric spider is common across A and B Type hubs of the same size designation. Plants running both hub types carry a single spider SKU per size — reducing spare parts inventory value and simplifying maintenance scheduling.

Misalignment Tolerance

The elastomeric spider accommodates radial, angular, and axial misalignment, protecting connected gearboxes, bearings, and motor windings from stresses that would otherwise result from minor shaft alignment errors during installation or thermal growth during operation.

Custom Bore & Keyway to Specification

As with all GBC jaw coupling models, bore diameter and keyway configuration are machined to customer drawings. Metric, imperial, and spline bore profiles are available. Bore tolerances are held to H7 as standard.

B Type Series — Technical Specifications

B Type Large Bore jaw coupling specification drawing with steel sleeve hub detail

Model Nom. Torque (N·m) Max Speed (rpm) Bore d₁,d₂ (mm) L (mm) L₀ (mm) D (mm) Weight (kg)
TS19B 10 19000 6–25 25 66 40 0.328
TS24B 35 14000 8–35 30 78 55 0.68
TS28B 95 11800 10–40 35 90 65 1.16
TS38B 190 9500 12–48 45 114 80 2.27
TS42B 265 8000 14–55 50 126 95 3.57
TS48B 310 7100 15–60 56 140 105 4.80
TS55B 410 6300 20–70 65 160 120 7.87
TS65B 625 5600 22–75 75 185 135 10.89
TS75B 1280 4750 30–90 85 210 160 17.73
TS90B 2400 3750 40–100 100 245 200 29.60
TS100B 3300 3350 50–110 110 270 225 43.0
TS110B 4800 3000 60–125 120 295 255 58.6
TS125B 6650 2650 60–145 140 340 290 88.4
TS140B 8600 2350 60–165 155 375 320 120.8
TS160B 12800 2000 80–190 175 425 370 179.1
TS180B 18650 1800 85–220 195 475 420 261.0

B Type jaw coupling steel sleeve hub detail — suitable for rolling mills and hoisting equipment

Industries & Applications

The B Type's steel sleeve and extended bore capacity position it as the coupling of choice wherever heavy shafts and high cyclic loads are the norm. Explore the complete GBC couplings catalogue for flanged, double-elastomer, and brake-disc variants suited to other heavy-duty configurations.

Hoisting & Lifting Equipment

Bridge cranes, overhead hoists, and mining winders transmit high torque through large-diameter drum shafts. The B Type's extended bore capacity and steel sleeve durability make it the preferred coupling for these demanding duty cycles.

Rolling Mills

Steel, aluminium, and copper rolling mills subject drive shafts to severe reversing torque and shock loading. The B Type absorbs peak torque spikes through the elastomeric spider while the steel sleeve resists the high clamping forces needed on large-bore keyway fits.

Construction Machinery

Concrete mixers, tower crane slewing drives, and piling rigs operate under variable and shock loading conditions in harsh outdoor environments. The polyurethane spider resists oil, grease, and moisture ingress, and its failure mode is progressive rather than sudden — providing a safety margin not offered by rigid couplings.

Heavy Conveyor Drives

Long overland conveyors, underground mine belt drives, and port shiploaders use large-diameter gearbox output shafts that fall outside the bore range of standard jaw couplings. The TS125B through TS180B models are regularly specified on these systems.

Customer Reviews & Case Studies

Australia — Mining & Minerals Processing

A hard-rock gold mine in Western Australia replaced forged-steel jaw couplings on six underground hoist drum drives with TS140B units. The steel sleeve hubs accommodated the 160 mm drum shaft diameter, and the elastomeric spider reduced shock transmission to the hoist motor by a measurable margin during emergency stop cycles. After 14 months of continuous operation, no spider replacement had been required.

★★★★★

"Handles the shock loads from emergency stops without complaint. Solid product."

United Kingdom — Steel Production

A steel strip rolling mill in South Wales specified TS180B couplings on three roughing stand drives. The 220 mm bore capacity accommodated the existing roll neck shaft diameter without requiring costly shaft modification. The shared spider inventory with existing A Type couplings on auxiliary drives reduced the site's coupling spare parts holding by consolidating to a single spider SKU per size.

★★★★★

"The shared spider spec with our A Type units saved us a significant inventory cost."

Canada — Port & Material Handling

A bulk materials terminal on the St. Lawrence Seaway fitted TS110B couplings to ship unloader belt drive gearboxes. Operating in sub-zero winter temperatures, the polyurethane spiders maintained flexibility and torque transmission without the brittleness observed with rubber elements in previous coupling designs. The terminal reported zero cold-weather coupling failures across two winter seasons.

★★★★☆

"First couplings we've used that don't go hard in a Canadian winter. Impressed."

Japan — Construction Machinery OEM

A major construction equipment manufacturer based in Osaka integrated TS75B and TS90B couplings into the slewing drive assemblies of a new concrete pump truck platform. The compact dimensions of the B Type allowed the coupling to fit within the existing driveline envelope, and the OEM confirmed dimensional repeatability across three production batches met their tolerance requirements.

★★★★★

"Consistent dimensions batch to batch — important for our assembly line tolerance stack-up."

Frequently Asked Questions

Why does the B Type use steel hub sleeves instead of cast iron?
Cast iron has sufficient compressive strength for standard bore-to-outer-diameter ratios, but when bore diameters approach 60–70% of the hub outer diameter, cast iron wall sections become too thin to reliably transmit high torque. Steel sleeve inserts maintain adequate wall thickness and tensile strength at large bore diameters, enabling the B Type to accept shafts up to Ø220 mm that would be structurally unsafe in a cast iron hub of the same outer diameter.
Is the B Type spider interchangeable with the A Type?
Yes. For each size designation (e.g. TS65), the A Type and B Type hubs use the same elastomeric spider. This is a deliberate design choice that simplifies spare parts management — sites using both hub types for different bore requirements need only stock one spider per size. Spider replacement procedure is identical across both hub types.
What is the maximum bore diameter for the B Type range?
The TS180B, the largest model in the B Type series, accepts bore diameters up to Ø220 mm — 20 mm larger than the equivalent TS180A. Across the full range, B Type bore capacities consistently exceed A Type capacities by 10–20 mm per size, which is the primary selection reason. Custom bore sizes within the structural limits of each hub can be machined to order.
How does the B Type handle shock loading from reversing drives?
The polyurethane spider's involute tooth profile distributes torque evenly across all spider lobes during both forward and reverse torque application. Under shock or overload conditions, the spider deforms elastically before any metal-to-metal contact occurs, protecting the hubs and connected machinery. For applications with particularly severe shock loads, upgrading to a 98 ShA spider increases the coupling's resistance to permanent deformation.
What service factor should I apply when selecting a B Type model?
A service factor of 1.5 is appropriate for steady, uniform loads (e.g. centrifugal pumps and fans). For moderate shock loads (e.g. conveyors with occasional overload), apply a factor of 2.0. For severe shock or reversing applications (e.g. hoists, rolling mills, compressors), use a factor of 2.5 or higher. Always select the coupling model whose nominal torque rating, after dividing by the service factor, meets or exceeds the application's peak torque requirement.

For applications requiring misalignment compensation beyond the B Type's capacity, consider the S Type Dual Elastomer Flexible Jaw Coupling, which uses a three-piece double-elastomer structure to accommodate significantly larger installation misalignment.

Sourcing B Type Jaw Couplings for Heavy-Duty Applications?

GBC supplies B Type large bore flexible jaw couplings to mining operators, OEM machine builders, and industrial distributors throughout Australia and internationally. Provide your shaft diameter, torque requirement, and application details — our engineering team will confirm the correct model and machining specification within one business day.

Submit a B2B Enquiry →

The B Type Large Bore Flexible Jaw Coupling uses steel hub sleeves to accommodate bore diameters up to Ø220 mm, making it the preferred choice for heavy-load drive units including hoists, rolling mills, and construction machinery. Nominal torque ranges from 10 to 18,650 N·m with a compact, low-inertia design that shares the standard A Type spider element.

Contact Us

Email

sales@australia-drive.com

stuart_hamill@generalbearing.com.au

Tel: +61 3 9070 7991

SKU: 5ac50a712d69 Categories: , Tags: , , , , , , , , ,

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