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Ever Power · UK Industrial Solutions
NGCLZ Drum Shape Gear Coupling
With Brake Wheel — Precision Power Transmission
The NGCLZ series drum shape gear coupling with integrated brake wheel delivers outstanding torque capacity, angular misalignment tolerance, and extended service life — engineered to the demands of the UK’s most challenging crane, mill, and pump drive applications.
What Is the NGCLZ Drum Shape Gear Coupling?
The NGCLZ drum shape gear coupling is a high-performance mechanical power transmission component designed around a crowned-tooth gear profile — sometimes called a barrel or drum tooth — that fundamentally changes how misalignment loads are absorbed compared with conventional spur-tooth designs. In a standard straight-tooth coupling, any angular deviation between connected shafts causes the tooth edge to bear the entire contact load, creating a stress concentration that wears through even well-lubricated teeth within months. The NGCLZ’s convex tooth crown distributes that same misalignment load across a rolling contact surface, so the coupling flexes with the drive rather than fighting it. For maintenance engineers operating overhead cranes at UK ports, winding engines at collieries, or large pump drives at water treatment plants, this distinction translates into measurably longer service intervals and fewer emergency shutdowns.
The addition of an integral brake wheel on the outer sleeve — which defines the NGCLZ variant — removes the need for a separate braking disc and its associated shaft extension, alignment procedure, and additional fastener set. By combining both functions in a single precision-machined assembly, the total installed footprint is smaller, the commissioning time is shorter, and the number of potential failure interfaces is reduced. This is a particularly compelling argument for retrofit applications, where envelope dimensions are fixed by existing steelwork and any growth in the drivetrain length requires expensive structural modifications.
Available in sizes NGCLZ1 through NGCLZ14 — covering limited torques from 355 KN·m through to 100,000 KN·m — the series serves a vast range of industrial drives. Ever Power manufactures the full range to GB and JB/T standards, with metric bore configurations as standard and imperial alternatives available on request. UK-partner stock is maintained for the most commonly specified sizes, and our in-house machining facility can turn around custom bore, keyway, and brake drum variants on lead times that compare favourably with any European coupling supplier.
Engineering Advantages of the NGCLZ Series
CROWNED TOOTH GEOMETRY
Barrel-shaped tooth profile accommodates angular misalignment and parallel offset without generating destructive edge-loading stress. Tooth contact stays uniform through the full load cycle, protecting downstream bearings and seals.
INTEGRAL BRAKE WHEEL
Brake drum machined concentric with the gear sleeve in a single setup — total run-out under 0.05 mm. Eliminates eccentricity-driven pad knock-back and ensures even brake lining wear over the full service interval.
HIGH TORQUE DENSITY
Carburised alloy steel teeth hardened to HRC 58–62 transmit rated torques in a compact outer diameter that would demand a far larger flexible jaw or disc coupling. Ideal where retrofits must respect existing guard clearances.
LABYRINTH SEAL SYSTEM
Neoprene/NBR lip seals combined with an outer labyrinth groove prevent grease migration at speeds above 1,500 rpm. Extended re-lubrication intervals cut maintenance visits on remotely sited drives — a real operational benefit at offshore and mining installations.
WIDE BORE RANGE
Standard catalogue bores span 20 mm through 250 mm across the NGCLZ1–NGCLZ14 range. Custom keyways, taper-lock hubs, and non-catalogue diameters are machined in-house — no minimum order quantity on established sizes.
UK STOCK & FAST DESPATCH
Common NGCLZ sizes held at UK-partner distribution points. Standard bore variants can be despatched next working day — critical when an unplanned outage at a steel plant or port crane carries a five-figure daily cost of downtime.
Working Principle, Materials & Industry Applications
HOW IT WORKS
Drive torque enters through the internal gear teeth of the hub on the driving shaft side, which mesh with the crowned external teeth of a floating intermediate sleeve. Because the sleeve teeth are barrel-shaped rather than straight, the sleeve can tilt fractionally as the coupled shafts shift relative to one another under load — the mechanical equivalent of a ball-and-socket joint operating at industrial torque levels. The outer sleeve, bolted between the two hub flanges, houses the grease reservoir and carries the integral brake drum on its outer circumference.
When the thruster or shoe brake is applied, the drum surface is clamped directly. Because the brake drum is machined as part of the coupling sleeve rather than attached to a separate disc, braking torque is transmitted straight into the drivetrain without the backlash or fretting corrosion that can develop at an additional coupling interface.
MATERIALS
| Component | Material | Treatment |
|---|---|---|
| Hubs | 45# Steel | Q+T HB 220–250 |
| Gear teeth | 20CrMnTi Alloy | Carburised HRC 58–62 |
| Outer sleeve | ZG310-570 Cast Steel | Normalised |
| Brake drum | HT250 Grey Iron | Ground Ra 1.6 |
| Seals | Neoprene / NBR | Oil-resistant |
TYPICAL UK APPLICATIONS
- Overhead cranes & ship-to-shore hoists (ports: Grimsby, Tilbury, Felixstowe)
- Mine winding engines & shaft headgear
- Rolling mill pinion stands & continuous casters
- Large vertical pump drives (water utilities, flood defence)
- Marine winch & deck machinery drives
- Aggregate crusher & ball mill drives
- Wind turbine pitch and yaw auxiliary drives
Technical Specification — NGCLZ Series (Complete)
Models NGCLZ1 – NGCLZ9
| Type | Limited Torque KN·m | Limited Speed R/min | d1, d2 (mm) | Y (mm) | J1, Z1 (mm) | D0 | D | D1 | D2 | C | C1 | H | B | B1 | B2 | B3 | Rotate Inertia Kg·m² | Weight Kg |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NGCLZ1 | 355 | 4000 | 20,22,24 | 52 | 38 | 160 | 103 | 71 | 71 | 50 | 30 | 8 | 2 | 42 | 38 | 68 | 7.3 | 0.071 |
| 25,28 | 62 | 44 | 7.4 | 0.072 | ||||||||||||||
| 30,32,35 | 82 | 60 | 8.4 | 0.076 | ||||||||||||||
| NGCLZ2 | 630 | 4000 | 25,28 | 62 | 44 | 160 | 115 | 83 | 83 | 60 | 39 | 8 | 2 | 48 | 42 | 68 | 9.2 | 0.081 |
| 30,32,35,38 | 82 | 60 | 10.3 | 0.084 | ||||||||||||||
| 40,42,45 | 112 | 84 | 10.5 | 0.088 | ||||||||||||||
| NGCLZ3 | 1000 | 3800 | 28 | 62 | 44 | 200 | 127 | 95 | 95 | 75 | 39 | 8 | 2 | 49 | 42 | 85 | 15.1 | 0.181 |
| 30,32,35,38 | 82 | 60 | 16.3 | 0.184 | ||||||||||||||
| 40,42,45,48,50,55 | 112 | 84 | 18.8 | 0.193 | ||||||||||||||
| NGCLZ4 | 1600 | 3800 | 38 | 82 | 60 | 200 | 149 | 116 | 116 | 90 | 46 | 8 | 2 | 53 | 42 | 85 | 19.8 | 0.225 |
| 40,42,45,48,50 55,56 | 112 | 84 | 23.3 | 0.242 | ||||||||||||||
| 60,63,65 | 142 | 107 | 26.8 | 0.296 | ||||||||||||||
| NGCLZ5 | 2800 | 3000 | 40,42,45,48,50 55,56 | 112 | 84 | 250 | 167 | 134 | 134 | 105 | 47 | 9 | 2.5 | 58 | 42 | 105 | 33.3 | 0.596 |
| 60,63,65,70,71.75 | 142 | 107 | 39 | 0.627 | ||||||||||||||
| NGCLZ6 | 4500 | 3000 | 45,48,50,55,56 | 112 | 84 | 250 | 187 | 153 | 153 | 125 | 52 | 9 | 2.5 | 59 | 42 | 105 | 40 | 0.72 |
| 60,63,65,70,71.75 | 142 | 107 | 46.4 | 0.776 | ||||||||||||||
| 80,85,90 | 172 | 132 | 53.2 | 0.837 | ||||||||||||||
| NGCLZ7 | 6300 | 2400 | 50,55,56 | 112 | 84 | 315 (300) | 204 | 170 | 170 | 140 | 52 | 9 | 2.5 | 63 | 42 | 132 | 51.8 | 1.178 |
| 60,63,65,70,71.75 | 142 | 107 | 59.8 | 1.254 | ||||||||||||||
| 80,85,90,95 | 172 | 132 | 68.2 | 1.348 | ||||||||||||||
| 100 | 212 | 167 | 79.6 | 1.479 | ||||||||||||||
| NGCLZ8 | 9000 | 1900 | 55,56 | 112 | 84 | 400 | 230 | 186 | 186 | 155 | 57 | 12 | 3 | 77 | 47 | 168 | 84 | 3.734 |
| 60,63,65,70,71.75 | 142 | 107 | 93.1 | 3.86 | ||||||||||||||
| 80,85,90,95 | 172 | 132 | 104 | 3.996 | ||||||||||||||
| 100,110 | 212 | 167 | 117 | 4.187 | ||||||||||||||
| NGCLZ9 | 14000 | 1500 | 60,63,65,70,71.75 | 142 | 107 | 500 | 256 | 212 | 212 | 180 | 64 | 13 | 3 | 47 | 47 | 210 | 133 | 9.43 |
| 80,85,90,95 | 172 | 132 | 146 | 9.663 | ||||||||||||||
| 100,110,120,125 | 212 | 167 | 164 | 9.997 | ||||||||||||||
| 130 | 252 | 202 | 182 | 10.3 |
Models NGCLZ10 – NGCLZ14
| Type | Limited Torque KN·m | Limited Speed R/min | d1, d2 (mm) | Y (mm) | J1, Z1 (mm) | D0 | D | D1 | D2 | C | C1 | H | B | B1 | B2 | B3 | Rotate Inertia Kg·m² | Weight Kg |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NGCLZ10 | 20000 | 1200 | 65,70,71.75 | 142 | 107 | 630 (600) | 287 | 239 | 200 | 120 | 65 | 15 | 3.5 | 90 | 47 | 265 | 28.238 | 176 |
| 80,85,90,95 | 172 | 132 | 28.509 | 190 | ||||||||||||||
| 100,110,120,125 | 212 | 167 | 28.879 | 209 | ||||||||||||||
| 130,140,150 | 252 | 202 | 29.248 | 237 | ||||||||||||||
| NGCLZ11 | 31500 | 1050 | 70,71.75 | 142 | 107 | 710 (700) | 325 | 276 | 235 | 134 | 77 | 16 | 3.5 | 94 | 47 | 298 | 44.309 | 257 |
| 80,85,90,95 | 172 | 132 | 44.825 | 275 | ||||||||||||||
| 100,110,120,125 | 212 | 167 | 45.53 | 300 | ||||||||||||||
| 130,140,150 | 252 | 202 | 46.235 | 326 | ||||||||||||||
| 160,170 | 302 | 242 | 47.08 | 357 | ||||||||||||||
| NGCLZ12 | 45000 | 1050 | 75 | 142 | 107 | 710 (700) | 362 | 313 | 270 | 164 | 94 | 17 | 4 | 104 | 49 | 298 | 47.88 | 306 |
| 80,85,90,95 | 172 | 132 | 48.29 | 317 | ||||||||||||||
| 100,110,120,125 | 212 | 167 | 49.52 | 351 | ||||||||||||||
| 130,140,150 | 252 | 202 | 50.25 | 384 | ||||||||||||||
| 160,170,180 | 302 | 242 | 52.22 | 425 | ||||||||||||||
| 190,200 | 325 | 282 | 53.69 | 464 | ||||||||||||||
| NGCLZ13 | 63000 | 950 | 150 | 252 | 202 | 800 | 412 | 350 | 300 | 165 | 88 | 18 | 4.5 | 113 | 49 | 335 | 82.7 | 490 |
| 160,170,180 | 302 | 242 | 84.7 | 544 | ||||||||||||||
| 190,200,220 | 352 | 282 | 86.67 | 596 | ||||||||||||||
| NGCLZ14 | 100000 | 950 | 170,180 | 302 | 242 | 800 | 462 | 420 | 335 | 209 | 92 | 20 | 5.5 | 157 | 63 | 335 | 99.1 | 670 |
| 190,200,220 | 352 | 282 | 102.2 | 736 | ||||||||||||||
| 240,250 | 410 | 330 | 105.9 | 785 |
Notes: 1. Axis hole of coupling with Y, Y, Z1, J1 / Y, J1, J1, J1 configurations. 2. B2 is the size for replacement of seal. 3. Bracketed size in new designs may not be chosen. All dimensions in mm unless otherwise stated. Non-standard bore, keyway, and flange configurations available — contact [email protected].
Manufacturing & Custom Engineering
Ever Power’s workshop is laid out as a dedicated gear coupling production cell: CNC gear-hobbing machines handle the crowned tooth form on hub and sleeve components; CNC turning centres with live tooling machine the brake drum surfaces to Ra 1.6 in a single clamping; gear-shaping equipment cuts the internal spline teeth; and a CMM inspection bay verifies finished dimensions against drawing tolerances before any component leaves the cell. The entire production sequence, from raw billet through to dynamic balance, is performed in-house — a deliberate choice that eliminates the quality risk and schedule variability associated with sub-contracting critical operations.
Customisation is treated as a routine engineering task rather than a special service. Over the past decade, our engineers have delivered NGCLZ couplings with modified brake drum diameters to suit legacy thruster brakes at UK steelworks, split-hub designs that allow installation on inaccessible shaft ends without removing adjacent components, non-standard keyway dimensions for OEM gearbox interfaces, and duplex stainless steel construction for a coastal water treatment plant where atmospheric chloride levels ruled out standard carbon steel. No minimum order quantity applies on these variants for established model sizes, and dimensional drawings with 3D STEP files are supplied as standard on custom orders.
Customer Success — Results From the Field
Background: A major integrated steelworks in North Lincolnshire was operating four roughing mill stands on spur-tooth gear couplings that required replacement roughly every 11 months. The failure mechanism was consistent: dynamic misalignment during a rolling campaign — caused by roll wear changing the pass line by up to 0.8 mm — created progressive tooth edge-loading that culminated in tooth fracture. Each coupling change on a rolling mill stand costs approximately £22,000 in lost production and maintenance labour, putting the annual coupling replacement bill at the site above £80,000 for these four stands alone.
Solution: Ever Power supplied NGCLZ11 drum shape gear couplings with custom 710 mm brake drum diameters matched to the existing Svendborg thruster brakes. The crowned tooth profile was specified to accommodate the full expected misalignment range with a comfortable margin. Hub bores and keyways were machined to match the existing spindle profiles precisely, avoiding any modification to the mill spindles themselves.
Outcome: After 22 months in service, all four NGCLZ11 couplings remained operational. Tooth surface inspection during a scheduled maintenance shutdown showed minor polishing only — no pitting or measurable profile loss. The site maintenance manager estimated that the switch to the crowned-tooth design had saved the steelworks approximately £60,000 in the first two years of operation, discounting the value of reduced exposure to unplanned outages entirely.
We operate five port cranes at Felixstowe and have standardised on NGCLZ couplings across our hoist drives after experiencing two failures with the previous supplier’s product inside 18 months. Two years since the change, we’ve had zero coupling-related stoppages. The technical support from the Ever Power applications team during the selection process was genuinely useful — not just a catalogue recommendation.
Thomas Aldridge
Engineering Manager · Felixstowe Port Logistics, Suffolk
Our previous drum shape gear coupling supplier quoted eight weeks for a custom brake drum diameter. Ever Power delivered in under three weeks — with full conformance documentation. For a planned maintenance shutdown, that difference is the difference between completing the job on schedule and carrying over into the next production campaign. We now specify Ever Power as the preferred coupling supplier on all our UK sites.
Rachel Forsythe
Plant Integrity Manager · Hargreaves Surface Mining, West Yorkshire
We installed NGCLZ8 couplings on three large vertical pump drives at our Manchester treatment works in a planned upgrade. Eighteen months later, vibration signatures are unchanged — no evidence of wear or lubricant breakdown — and we’ve extended the re-greasing interval from 6 to 20 weeks. The sealed design handles our wet plant environment without the leakage issues we had with the previous units.
James Rothwell
Mechanical Engineering Lead · United Utilities, Manchester
Frequently Asked Questions
Where can I find a reliable drum shape gear coupling supplier with brake wheel options for overhead crane hoists in the UK?
Ever Power supplies NGCLZ drum shape gear couplings with integral brake wheels to crane OEMs and end-user maintenance teams across the UK, with UK-partner stock covering the most commonly specified sizes. Email [email protected] with your shaft dimensions, torque requirement, and brake drum diameter for a same-day response.
What is the price for a custom bore NGCLZ drum shape gear coupling with a non-standard brake drum diameter for a retrofit at a UK steelworks?
Custom NGCLZ pricing depends on model size, bore diameter, keyway configuration, brake drum geometry, and any required certification. There is no minimum order quantity on custom variants for established model sizes. Send your drawings or dimensional survey to [email protected] — we return a formal quotation within one working day.
How does a drum shape gear coupling with an integrated brake wheel differ from a separate coupling and brake disc arrangement on a mine winding machine?
A separate coupling and brake disc arrangement introduces an additional flanged interface, extra fasteners, a second alignment task during commissioning, and a potential fretting surface. The NGCLZ integrates the brake drum directly into the coupling outer sleeve — machined concentric in one setup — eliminating all of those issues and reducing the overall drivetrain length, which is often the deciding factor in tight underground or headgear installations.
Which NGCLZ size should I select for a rolling mill pinion stand drive rated at 4,000 KN·m with 1,050 rpm shaft speed in the UK?
At 4,000 KN·m with a service factor of 1.5 for a rolling mill (heavy shock load), the design torque is 6,000 KN·m, which points to NGCLZ11 (limited torque 31,500 KN·m) with a comfortable margin. Confirm the shaft bore range and brake drum diameter with our applications team — email [email protected] with full drive data for a written recommendation.
Can Ever Power quote for NGCLZ couplings with duplex stainless steel construction for a coastal water utility application in Scotland?
Yes. Duplex and super-duplex stainless construction is available for NGCLZ couplings used in coastal or chemically aggressive environments. We have supplied stainless variants to UK water utilities and offshore clients where standard carbon steel would suffer unacceptable corrosion within the specified maintenance interval. Contact [email protected] with your environment details and service conditions.
When is the right time to replace rather than re-grease a drum shape gear coupling on a UK port crane hoist drive?
Replace when tooth wear exceeds 15% of original tooth thickness, when pitch-line pitting covers more than 4% of any tooth flank, when lubricant contamination shows visible metallic particles, when the seal leaks grease between scheduled intervals, or when vibration monitoring shows a progressive increase in coupling-related frequency content. Send inspection photographs to [email protected] for a condition assessment at no charge.
How long does it take Ever Power to deliver a custom NGCLZ drum shape gear coupling to a UK site, and what documentation is included?
Standard bore variants from UK stock can be despatched next working day. Custom bore and non-standard brake drum variants typically ship within 15–20 working days from order confirmation. Standard documentation includes material test reports (MTRs) for all principal components, dimensional inspection reports, and a declaration of conformity. Additional certificates — EN 10204 3.1, ATEX, third-party inspection — are available on request at the quotation stage.
Ever Power · UK Industrial Coupling Solutions
Specify your NGCLZ drum shape gear coupling today
Standard catalogue or fully engineered-to-order — our applications team provides written size recommendations, dimensional drawings, and formal quotations within one working day. No obligation, no minimum order.
NGCLZ Drum Shape Gear Coupling with Brake Wheel | Ever Power | Serving UK Industry | edit by gzl
