{"id":1918,"date":"2026-07-21T06:57:14","date_gmt":"2026-07-21T06:57:14","guid":{"rendered":"https:\/\/gearrack.top\/?p=1918"},"modified":"2026-07-21T06:57:14","modified_gmt":"2026-07-21T06:57:14","slug":"double-helical-gears-for-heavy-industry","status":"publish","type":"post","link":"https:\/\/gearrack.top\/ja\/double-helical-gears-for-heavy-industry\/","title":{"rendered":"Double Helical Gears for Heavy Industry"},"content":{"rendered":"
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GEAR APPLICATION GUIDE \u00b7 HELICAL GEAR \u00b7 H06<\/span><\/p>\n

Double Helical Gears for Heavy Industry:
\nSteel Mills, Cement Plants and Large Power Transmission<\/span><\/h1>\n

Double helical (herringbone) gears represent the pinnacle of large-scale power transmission engineering \u2014 combining the noise reduction and load capacity advantages of helical gear tooth contact with the unique ability to cancel axial thrust forces that would otherwise require massive, expensive thrust bearings on large shafts. From steel mill roughing stand gearboxes transmitting 20+ MW to cement mill ring-and-pinion open gears spanning 6 metres in diameter, double helical gears handle the most demanding power transmission requirements in heavy industry. This guide covers design principles, material specification, manufacturing challenges, and application engineering for double helical gears in steel, cement, mining, and large industrial gearbox applications.<\/p>\n

18CrNiMo7-6 \u00b7 34CrNiMo6 \u00b7 42CrMo4 \u00b7 Cast Steel<\/span>
\nM10\u2013M40 \u00b7 Zero Axial Thrust \u00b7 DIN 5\u20137<\/span>
\nSteel Mill \u00b7 Cement \u00b7 Mining \u00b7 Ship Propulsion<\/span><\/div>\n<\/div>\n<\/div>\n
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MODULE RANGE<\/p>\n

M10 \u2013 M40<\/p>\n

Heavy industry double helical gear module range. Medium industrial gearbox (up to 5 MW): M10\u2013M18. Steel mill roughing stand: M16\u2013M28. Large cement mill pinion: M22\u2013M36. Very large ship propulsion bull gear: M28\u2013M40<\/p>\n<\/div>\n

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POWER RANGE<\/p>\n

1 \u2013 30 MW<\/p>\n

Double helical gears are the standard choice when single-helical gears would require excessively large thrust bearings or when bearing axial load rating is exceeded. Steel mill roughing stands: 5\u201325 MW. Cement ball mill drive: 2\u20138 MW. Large ship propulsion: 10\u201330 MW<\/p>\n<\/div>\n

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HELIX ANGLE (PER SIDE)<\/p>\n

20\u00b0 \u2013 35\u00b0<\/p>\n

Helix angle per helix in a double helical gear pair. Higher helix angle increases contact ratio and reduces noise but increases the face width required for the central groove between helix halves. Standard heavy industrial double helical: 25\u00b0\u201330\u00b0 per helix<\/p>\n<\/div>\n

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FACE WIDTH<\/p>\n

\u2265 2\u00d7 module \u00d7 \u03c0 \/ sin(\u03c8)<\/p>\n

Minimum face width per helix for axial overlap ratio \u2265 1.0. At M20, helix 25\u00b0: minimum face per helix = 2 \u00d7 20 \u00d7 \u03c0 \/ sin(25\u00b0) = 298 mm per helix side, total \u2265 600 mm including central groove<\/p>\n<\/div>\n<\/div>\n

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The Engineering Case for Double Helical Gears in Heavy Industry<\/h2>\n

The decision to specify double helical gears instead of single helical gears in a heavy industrial drive is driven by a single dominant consideration: the axial thrust generated by a large single helical gear at high helix angle and high torque exceeds what is practical to absorb with rolling element or hydrodynamic thrust bearings on large, heavy shafts. At 25\u00b0 helix angle and 5 MNm torque (typical for a steel mill roughing stand intermediate shaft), the axial thrust component on a single helical gear is Fa<\/sub> = Ft<\/sub> \u00d7 tan(25\u00b0) = Ft<\/sub> \u00d7 0.466. For a 2,000 mm pitch diameter gear with 5 MNm torque, Ft<\/sub> = 5,000,000 \u00f7 1.0 m = 5 MN, so Fa<\/sub> = 2.33 MN axial thrust \u2014 requiring a hydrodynamic thrust bearing capable of sustaining 2.33 MN continuously, a massive and expensive engineering challenge. The double helical gear, by combining left-hand and right-hand helices of equal hand and helix angle on the same gear body, generates equal and opposite axial thrust components that cancel within the gear mesh itself, reducing the net axial shaft force to the small residual from manufacturing helix angle error \u2014 typically less than 2% of the tangential force.<\/p>\n

Korea Ever-Power’s double helical gears for heavy industry<\/a> are manufactured in 18CrNiMo7-6 and 34CrNiMo6 case carburized (for gearbox gears requiring maximum fatigue life at high PLV), 42CrMo4 through-hardened (for medium-duty gearbox stages and slower-speed cement and mining drives), and 20MnCr5 (for replacement supply to existing heavy gearboxes where cost is the primary consideration). Large open gear pinions for cement mills and kilns are manufactured in 42CrMo4 QT (HB 270\u2013320) with tooth surfaces induction hardened to HRC 52\u201356, allowing the pinion to be manufactured in sections for transport and assembled on-site if the pinion diameter exceeds road transport limits.<\/p>\n

The manufacturing of double helical gears presents challenges not present in single helical gear production. The two helix halves must be hobbed or ground to exactly the same lead angle (same helix angle magnitude, opposite hand) and the phase relationship between the two halves \u2014 called the herringbone phase \u2014 must be maintained to within \u00b10.01 mm to avoid load concentration on one helix half. The central groove between the two helix halves must be wide enough to accommodate the hobbing cutter run-out and provide clearance for the mating gear\u2019s axial float (a floating pinion is used in most herringbone gear applications to allow the pinion to self-centre under load). Korea Ever-Power machines double helical gears on dedicated CNC hobbing machines with automatic helix hand changeover, maintaining helix angle equality between left and right halves to \u00b10.01\u00b0 and herringbone phase accuracy to \u00b10.015 mm on all production gears.<\/p>\n

\"industrial
Korea Ever-Power industrial double helical (herringbone) gear for heavy-duty gearbox application \u2014 42CrMo4 QT through-hardened HB 310\u2013350, M18, left + right helix 28\u00b0 per side, OD 920 mm, total face width 460 mm (2 \u00d7 210 mm helices + 40 mm central groove), DIN 6 quality class. Herringbone phase error \u2264 0.012 mm between left and right helix halves. Tooth surface Ra \u2264 0.8 \u03bcm after hobbing \u2014 ground finish available for DIN 5 on request. Used in steel mill gearbox intermediate stages and large industrial compressor bull gears where single-helical axial thrust would exceed thrust bearing capacity. Korea Ever-Power supplies matched double helical gear pairs for all major industrial gearbox brands including Renk, David Brown, and Elecon replacement programmes.<\/figcaption><\/figure>\n<\/section>\n
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Heavy Industry Application Types<\/h2>\n
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APP 01<\/p>\n

STEEL MILL
\nROLLING STAND<\/p>\n<\/div>\n

\n

Double helical gear specification:<\/strong> M16\u2013M28, 18CrNiMo7-6 or 34CrNiMo6 carburized, DIN 5\u20136 ground, 5\u201325 MW, helix 25\u00b0\u201330\u00b0 per side, floating pinion arrangement to cancel residual axial force from helix angle manufacturing error. Steel rolling mills use double helical gearboxes (called pinion stands) at every rolling stage to convert the electric motor speed and torque to the rolling roll speed. The roughing mill pinion stands, which reduce large hot billets at high rolling force, transmit 5\u201325 MW per strand \u2014 at this power level and the moderate speed of roughing stands (100\u2013400 RPM roll speed), the torque per gear is enormous. Double helical gears are mandatory because single-helical gears would generate axial forces exceeding 1 MN per gear on a roughing stand shaft, requiring hydrodynamic thrust bearings larger and more expensive than the gears themselves. The pinion stand also experiences severe cyclic torque variation as each roll pass begins and ends \u2014 the impact torque at rolling entry can exceed 3\u20134 times the steady rolling torque, requiring 18CrNiMo7-6 or 34CrNiMo6 for the core toughness needed to survive these shock cycles over the mill\u2019s 20+ year design life. Korea Ever-Power supplies double helical replacement pinion gear sets for steel mill roughing, intermediate, and finishing stand gearboxes \u2014 contact with the mill OEM, pinion stand designation, and roll speed for specification and quotation.<\/p>\n<\/div>\n<\/div>\n

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APP 02<\/p>\n

CEMENT MILL
\nGIRTH GEAR DRIVE<\/p>\n<\/div>\n

\n

Double helical gear specification:<\/strong> M20\u2013M36, pinion in 42CrMo4 QT HB 270\u2013320 or 34CrNiMo6, girth gear (ring gear) in cast steel GS-42CrMo4, double helical tooth form on both pinion and girth gear, DIN 7\u20138, helix 15\u00b0\u201320\u00b0 per side (lower helix angle than gearbox gears because girth gear diameter limits the practical helix without excessive groove width). Cement ball mills and vertical roller mills are driven through a girth gear (a large ring gear bolted to the mill shell) meshing with a pinion driven by the main gearbox. Ball mills above 3.5 MW use double helical girth gears and double helical pinions \u2014 at 5 MW and 3 RPM mill speed, the tangential force on a single-helical girth gear mesh would generate an axial force that the mill shell flange bolting cannot practically resist. The double helical arrangement balances this force within the mesh. Girth gears are large enough to require manufacture in segments (typically 4 or 8 segments per girth gear) for transport to site, with precision spigot-and-bolt joints maintaining concentricity after field assembly. Korea Ever-Power manufactures both cement mill pinions and segmented girth gears in the M20\u2013M36 range, with field assembly measurement documentation and tooth contact pattern check procedures.<\/p>\n<\/div>\n<\/div>\n

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APP 03<\/p>\n

LARGE SHIP
\nPROPULSION<\/p>\n<\/div>\n

\n

Double helical gear specification:<\/strong> M22\u2013M40, 18CrNiMo7-6 carburized or 42CrMo4 QT (for slower-speed cruise ship propulsion), DIN 5\u20136 ground, PLV 30\u201380 m\/s at the high-speed stage pinion, helix 25\u00b0\u201335\u00b0 per side, floating bull gear arrangement, classification society (DNV GL, BV, Lloyd\u2019s) material and quality approval. Naval vessel and large merchant ship reduction gearboxes reduce the gas turbine or diesel prime mover speed (typically 3,000\u201310,000 RPM) to the propeller shaft speed (80\u2013180 RPM) in two or three gear stages, transmitting 10\u201330 MW per shaft. The enormous bull gear of a naval or LNG carrier reduction gearbox \u2014 up to 5 m OD, 30+ tonnes, manufactured from a single forging \u2014 is virtually always double helical, because the alternative single-helical design at this scale would require a thrust bearing the size of a small house on the propeller shaft. These gears are manufactured to the most demanding specifications in the commercial gear industry \u2014 DIN 5 or better quality class, with individual tooth-by-tooth measurement reports, and class society surveyor witness inspection during manufacture, heat treatment, and final dimensional inspection before shipment.<\/p>\n<\/div>\n<\/div>\n

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APP 04<\/p>\n

INDUSTRIAL
\nGEARBOX OEM<\/p>\n<\/div>\n

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Double helical gear specification:<\/strong> M10\u2013M22, 18CrNiMo7-6 carburized (high duty) or 42CrMo4 QT (standard duty), DIN 5\u20137, custom tooth geometry matched to gearbox housing bearing arrangement. Large enclosed industrial gearboxes for pump drives, fan drives, and generator drives above 2 MW commonly use double helical gear stages when the helix angle required for noise and load capacity targets would generate excessive bearing loads in single-helical form. The double helical enclosed gearbox has the advantage of simplified bearing arrangement \u2014 the pinion and wheel shaft bearings carry only radial load, because the axial thrust is self-contained within the double helical mesh. This allows smaller, lower-cost radial bearings on the gear shafts, with the cost and weight saving partly offsetting the higher cost of the double helical gears compared to single helical alternatives. Korea Ever-Power supplies double helical gear sets for industrial gearbox OEM production and for replacement supply to existing gearboxes from Renk (now RENK Group), David Brown (Timken Drives), Elecon Engineering, and Lufkin Industries (Baker Hughes).<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\"heavy
Korea Ever-Power large module double helical gear for heavy machinery application \u2014 34CrNiMo6 carburized, M24, OD 1,850 mm, total face width 820 mm (2 \u00d7 380 mm + 60 mm groove), DIN 6 quality class. Manufactured from a single forged blank in one-piece construction for gearbox ratings below 12 MW per gear. Tooth root bending safety factor S_F \u2265 1.8 and contact fatigue safety factor S_H \u2265 1.25 per ISO 6336 at rated load. Individual gear measurement report per AGMA 915 covering all tooth geometry parameters, plus material certificate, heat treatment record, and MT\/PT non-destructive examination report. Available for direct replacement of existing heavy industrial gearbox double helical gears with detailed reverse-engineering from existing gear dimensions.<\/figcaption><\/figure>\n<\/section>\n
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Manufacturing Challenges Specific to Double Helical Gears<\/h2>\n

The manufacture of double helical gears involves several technical challenges that are absent in single helical or spur gear production, and which limit the number of manufacturers worldwide capable of producing large double helical gears to the required quality class. Understanding these challenges helps buyers make informed decisions about supplier capability assessment and quality verification.<\/p>\n

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Herringbone Phase Accuracy<\/h3>\n

The phase relationship between the left and right helix halves \u2014 measured as the angular offset of corresponding tooth spaces between the two sides \u2014 must be maintained within \u00b10.010\u20130.020 mm to ensure the two helix halves make contact at precisely the same position in the tooth mesh cycle. Phase error causes one helix half to carry more load than the other (the half with smaller phase error contacts first and must share the load with the other half before the second half makes contact). At large modules, a phase error of 0.030 mm between helix halves can shift the load ratio to 60:40 instead of the assumed 50:50, increasing the maximum stress on the leading helix half by 20% and potentially causing premature fatigue failure. Korea Ever-Power measures herringbone phase error using a dedicated CMM fixture that simultaneously contacts both helix half tooth surfaces at the same axial position.<\/p>\n

Target: \u2264 0.015 mm phase error<\/p>\n<\/div>\n

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Central Groove Design and Cutter Run-Out<\/h3>\n

The central groove between the two helix halves must be wider than the hobbing cutter\u2019s run-out path at the end of each helix (the cutter must exit the tooth form at the groove before the helix direction reverses). Minimum central groove width = hobbing cutter OD \u00d7 sin(helix angle) + clearance. At M20 and helix 28\u00b0, hobbing cutter OD \u2248 180 mm: minimum groove = 180 \u00d7 sin(28\u00b0) + 5 = 84 + 5 = 89 mm. Central groove width must also accommodate the axial float of the floating pinion (typically \u00b15 mm for large herringbone gearboxes). A groove that is too narrow prevents clean hob exit and leaves undercut in the tooth form adjacent to the groove; a groove that is too wide wastes face width and reduces the tooth\u2019s load-sharing between the two helices. Korea Ever-Power calculates the minimum groove width for each double helical gear from the module, helix angle, and cutter geometry before hobbing tool selection.<\/p>\n

Typical groove: 1.5\u20133\u00d7 module per helix angle<\/p>\n<\/div>\n

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Heat Treatment Distortion Control<\/h3>\n

Large double helical gears in 18CrNiMo7-6 or 34CrNiMo6 are case carburized at 900\u2013950\u00b0C and then oil-quenched \u2014 a process that causes dimensional distortion from the thermal gradient between the case and core during rapid cooling. The distortion of a large double helical gear typically manifests as differential growth of the two helix halves \u2014 because the mass distribution of the central groove region creates a local temperature gradient at quench that affects the two sides unequally. This distortion must be corrected by post-quench grinding of both tooth flank surfaces and the bore. For large gears (OD above 800 mm) where grinding is not practical across the full face width, through-hardening with 42CrMo4 (which requires no quench from high temperature) is used instead of carburizing, accepting the lower tooth hardness in exchange for better dimensional control. Korea Ever-Power pre-distorts the hobbing path for large carburized double helical gears based on measured distortion data from previous similar gear heat treatments, reducing the post-quench material removal required in grinding.<\/p>\n

Key: carburize vs. through-harden selection<\/p>\n<\/div>\n<\/div>\n

\"gear
Korea Ever-Power gear measurement and quality control facility \u2014 CNC coordinate measuring machine (CMM) for large gear profile, lead, and spacing measurement on double helical gears up to 2,500 mm OD. All large module double helical gears receive 100% tooth measurement on dedicated CMM equipment, with individual tooth reports submitted to the customer before shipment as part of the quality documentation package. Korea Ever-Power\u2019s measurement programme covers: profile form error ff-\u03b1, profile slope deviation fH-\u03b1, lead form error ff-\u03b2, lead slope deviation fH-\u03b2, pitch deviation fp and Fu, cumulative pitch error Fp, runout Fr, herringbone phase error \u2014 all per DIN 3960\/3962 or AGMA 915-1-A02 as specified by the customer.<\/figcaption><\/figure>\n<\/section>\n
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Frequently Asked Questions \u2014 Double Helical Gears for Heavy Industry<\/h2>\n
\n
\n
Q 01<\/span><\/p>\n

When should I choose double helical gears over single helical gears for a new heavy industrial gearbox design, and what design changes are needed to accommodate them?<\/p>\n<\/div>\n

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The choice between single helical and double helical gears for a heavy industrial gearbox comes down to three assessment criteria: (1) Axial thrust vs bearing capacity:<\/strong> calculate the axial thrust of the proposed single helical gear at the maximum helix angle and rated torque. If this thrust exceeds 30\u201340% of the available thrust bearing axial dynamic load rating Ca<\/sub> in the current bearing arrangement, double helical is recommended to eliminate the thrust. (2) Shaft deflection from axial load:<\/strong> on long shafts (shaft L\/D above 8:1), the axial force from a single helical gear bends the shaft and shifts the tooth contact to the tooth ends \u2014 this aggravates the lead contact pattern and concentrates stress at the tooth edges. Double helical eliminates this effect by self-cancelling thrust. (3) Noise specification:<\/strong> at the same helix angle, double helical gears have a higher total contact ratio than single helical (because both helix halves contribute independently), reducing transmission error and noise by 2\u20134 dB(A) vs single helical. Design changes needed for double helical accommodation: the gearbox housing must accommodate the wider total face width (both helices plus central groove) \u2014 typically 2.5\u20133\u00d7 the single helical face width for the same load capacity at the same helix angle. One shaft (usually the pinion shaft) must be allowed axial float of \u00b15\u201310 mm to permit the double helical mesh to self-centre under load \u2014 this precludes a fixed thrust bearing on the pinion shaft and requires an axially floating bearing arrangement. Korea Ever-Power can assist with the axial thrust calculation and gear sizing for new double helical gearbox designs \u2014 contact with the required transmitted power, input and output speeds, and available housing envelope dimensions.<\/p>\n<\/div>\n<\/div>\n

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Q 02<\/span><\/p>\n

What causes one helix half to wear faster than the other in a double helical gear set, and how is this diagnosed and corrected?<\/p>\n<\/div>\n

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Unequal wear between the left and right helix halves of a double helical gear is the most common failure mode in herringbone gear sets and has four root causes: (1) Herringbone phase error exceeding 0.015 mm:<\/strong> the leading half contacts first and carries disproportionate load. Diagnose by blue-marking contact pattern \u2014 the leading half shows wider tooth contact width than the lagging half. Correct by remanufacturing with tighter phase control, or by selective shimming of the housing to shift the floating pinion toward the lagging half. (2) Helix angle inequality between halves:<\/strong> if left helix angle \u2260 right helix angle (even by 0.01\u00b0), the self-centering force of the floating pinion will push it toward the side with the smaller helix angle (which generates less axial separating force), overloading that side. Diagnose by lead measurement on both halves \u2014 the helix angles should be identical to within \u00b10.01\u00b0. Correct by remanufacturing the affected half to the correct helix angle. (3) Housing bore parallelism error:<\/strong> if the pinion and wheel shaft bearing housings are not parallel within 0.01 mm per 1,000 mm shaft length, the tooth contact on both halves shifts toward the high-side edge, concentrating stress in one area of both helices simultaneously. Diagnose by contact pattern under blue marking \u2014 both halves show edge contact on the same side. Correct by re-scraping or re-boring the bearing housing to correct parallelism. (4) Insufficient pinion float:<\/strong> if the floating pinion\u2019s axial movement is restricted by a misaligned floating bearing arrangement, the pinion cannot self-centre and one helix half carries the majority of the load. Check pinion axial float by measuring the float range with feeler gauges \u2014 minimum float should be \u00b13 mm for industrial gearboxes, \u00b15 mm for mill gearboxes. Korea Ever-Power can analyse failure mode from tooth contact pattern photographs and gear measurement data \u2014 contact with high-resolution contact pattern photographs and the gear measurement reports for a specific failure analysis.<\/p>\n<\/div>\n<\/div>\n

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Q 03<\/span><\/p>\n

What is the lead time and documentation package for large double helical gear replacement sets for a steel mill pinion stand or cement mill girth gear drive?<\/p>\n<\/div>\n

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Lead time and documentation for large double helical replacement gear sets from Korea Ever-Power: Steel mill pinion stand (M16\u2013M24, 18CrNiMo7-6 carburized, DIN 6 ground):<\/strong> 50\u201370 days from confirmed drawing or reverse-engineering measurement to shipment. This allows 7\u201310 days for forging procurement, 15\u201320 days for rough machining and heat treatment, 15\u201320 days for finish machining and grinding, and 5\u20137 days for final inspection and documentation. Cement mill pinion (M22\u2013M30, 42CrMo4 QT, induction-hardened tooth surface):<\/strong> 55\u201375 days. Documentation package for each order:<\/strong> material mill certificate (chemical composition and mechanical properties with forging identity traceability); heat treatment record (carburizing atmosphere curve and quench temperature\u2013time record, or through-hardening and tempering records); dimensional inspection report (all drawing dimensions confirmed, including herringbone phase error measurement); tooth profile and lead measurement report per DIN 3960 or AGMA 915 for all measured tooth positions; surface hardness report (minimum 5 tooth positions, HRC value and case depth from surface hardness traverse); non-destructive examination report (magnetic particle or dye penetrant on all tooth flanks and roots, confirming no indications); photographic record (gear blank after forging, after machining, and after heat treatment); and ISO 9001:2015 quality management system certificate. For steel mill and cement plant orders requiring third-party inspection agency witness (Bureau Veritas, T\u00dcV, SGS, or similar), Korea Ever-Power can arrange inspection at Korea Ever-Power\u2019s facility at an additional 7\u201310 days to the lead time for scheduling the inspector\u2019s visit.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Explore Korea Ever-Power Gear Categories<\/h2>\n

Seven precision gear product lines for heavy industry, energy, marine and specialist applications worldwide.<\/p>\n<\/div>\n

\n
\"forged<\/p>\n
\n

Spur Gears<\/a><\/p>\n

Forged \u00b7 M1\u2013M20 \u00b7 heavy duty<\/p>\n<\/div>\n<\/div>\n

\"double<\/p>\n
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Helical Gears<\/a><\/p>\n

Double helical \u00b7 M10\u2013M40 \u00b7 steel mill<\/p>\n<\/div>\n<\/div>\n

\"bevel<\/p>\n
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\u30d9\u30d9\u30eb\u30ae\u30a2<\/a><\/p>\n

Large bevel \u00b7 industrial \u00b7 mining drive<\/p>\n<\/div>\n<\/div>\n

\"worm<\/p>\n
\n

Worm Gears<\/a><\/p>\n

High ratio \u00b7 self-locking \u00b7 valve drive<\/p>\n<\/div>\n<\/div>\n

\"ring<\/p>\n
\n

Ring Gears<\/a><\/p>\n

Large ring \u00b7 mill drive \u00b7 slewing<\/p>\n<\/div>\n<\/div>\n

\"planetary<\/p>\n
\n

Planetary Gears<\/a><\/p>\n

High torque density \u00b7 wind \u00b7 industrial<\/p>\n<\/div>\n<\/div>\n

\"plastic<\/p>\n
\n

Plastic Gears<\/a><\/p>\n

MC Nylon \u00b7 PEEK \u00b7 sensor drives<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

\n
<\/div>\n

GET A QUOTATION \u00b7 KOREA EVER-POWER<\/p>\n

Need Double Helical Gears for Heavy Industry?<\/h2>\n

Korea Ever-Power manufactures 18CrNiMo7-6, 34CrNiMo6, and 42CrMo4 double helical gears for all heavy industrial applications \u2014 steel mill pinion stands, cement mill girth gear drives, large ship propulsion gearboxes, and industrial gearbox OEM supply. Module M10\u2013M40, face width up to 1,200 mm, DIN 5\u20137 quality class. Full material, heat treatment, dimensional, and NDE documentation package standard. Replacement for Renk, David Brown, Elecon, and all major industrial gearbox brands. ISO 9001:2015 certified.<\/p>\n

Request a Quotation \u2192<\/a><\/p>\n<\/div>\n

\u7de8\u96c6\u8005: Cxm<\/em><\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

GEAR APPLICATION GUIDE \u00b7 HELICAL GEAR \u00b7 H06 Double Helical Gears for Heavy Industry: Steel Mills, Cement Plants and Large Power Transmission Double helical (herringbone) gears represent the pinnacle of large-scale power transmission engineering \u2014 combining the noise reduction and load capacity advantages of helical gear tooth contact with the unique ability to cancel axial thrust forces that would otherwise require massive, expensive thrust bearings on large shafts. From steel mill roughing stand gearboxes transmitting 20+ MW to cement mill ring-and-pinion open gears spanning 6 metres in diameter, double helical gears handle the most demanding power transmission requirements in heavy industry. This guide covers design principles, material specification, manufacturing challenges, […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[4566],"tags":[],"class_list":["post-1918","post","type-post","status-publish","format-standard","hentry","category-application-of-gears"],"_links":{"self":[{"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/posts\/1918","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/comments?post=1918"}],"version-history":[{"count":1,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/posts\/1918\/revisions"}],"predecessor-version":[{"id":1921,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/posts\/1918\/revisions\/1921"}],"wp:attachment":[{"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/media?parent=1918"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/categories?post=1918"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gearrack.top\/ja\/wp-json\/wp\/v2\/tags?post=1918"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}