Sprockets for Escalators

от | 2 апреля 2026 г. | Звездочки

Sprockets for Escalators

Escalator step-chain drives and drive units represent one of the most demanding applications for precision roller chain sprockets — operating continuously in public-access environments where safety, noise, vibration, and extended service intervals are all critical. The escalator sprocket (drive wheel) must withstand the combined weight and dynamic load of steps, passengers, and the step chain system across 20+ years of service life. Explore our heavy-duty sprocket range for escalator and moving walkway applications.

Escalator step chain drive sprocket

Обзор

Escalators in shopping centres, airports, railway stations, and office buildings across Australia run at step speeds of 0.5–0.75 m/s for up to 20 hours per day, seven days per week. The step chain drive system — comprising the main drive sprocket, step-chain sprockets, and return sprockets — is the core power transmission system and must meet stringent safety, noise, and wear standards. Regulatory compliance with EN 115 (Australia adopts AS 1735 which references EN 115) requires escalator drive components to meet defined safety factors and service-life criteria.

Ever-power Australia manufactures and supplies escalator-grade drive sprockets and step-chain sprockets to the dimensional specifications of major escalator manufacturers, with case-hardened alloy steel construction and precision tooth profiles for low-noise, long-life operation.

Технические характеристики

Параметр Escalator Value Примечания
Step Chain Pitch 133.33 mm / 203.2 mm EN 115 standard pitches
Drive Sprocket Pitch Matches step chain pitch Always specify chain pitch first
Number of Teeth 16T – 24T (drive) Larger for lower noise
Материал 40Cr alloy steel C45 for lower-load applications
Твердость зуба HRC 52–60 Case-hardened alloy steel
Глубина дела 2.0–4.0 mm Deeper for heavy transit escalators
Допуск на диаметр канала ствола H7 / H6 Precision fit for drive shaft
Диаметр вала 50–120 мм Escalator-dependent
Хаб Стиль Solid hub with keyway Split hub on request for in-situ access
Поверхность Zinc plate / black oxide Corrosion-resistant for machine room
Fatigue Life ≥200 million cycles EN 115 derived requirement
Max Pitch Line Load Per EN 115 safety factor Application-specific design
Рабочая температура −5°C to +50°C Machine room range
Noise Level ≤70 dB (drive station) Passenger comfort requirement
Стандарт EN 115 dimensional ANSI B29.1 for non-standard pitches
Surface Roughness Ra ≤1.6 μm (bore) High-finish for shaft fit
Runout (TIR) ≤0,05 мм Vibration critical
Tooth Profile Precision involute Custom profile on request
Документация Material cert + dimensional report Safety-critical application

Преимущества в производительности

1
🔐 Safety-Grade Material Quality
40Cr alloy steel with case hardening to HRC 52–60 meets the fatigue-life requirements of escalator step-chain drives. Full material traceability (EN 10204 3.1 certificates) available for maintenance record compliance.
2
🔇 Low-Noise Precision Hobbing
Grade 6 tooth profiles with matched pitch tolerance minimise the ‘polygon effect’ (velocity ripple from chordal action) in escalator step chain drives — essential for passenger comfort and structural vibration compliance.
3
⌛ Extended Service Life
Deep case hardening (2–4 mm) combined with alloy steel core toughness delivers escalator-grade service life of 80,000+ operating hours, matching 15–20 year escalator refurbishment cycles.
4
📑 Dimensional Documentation
Dimensional inspection reports, hardness test certificates, and material test certificates (EN 10204 2.2 or 3.1) are standard for escalator sprocket orders — meeting building owner and maintenance contractor documentation requirements.

Working Principle in Escalator Step-Chain Drives

In an escalator, the step-chain system operates as a continuous loop driven by the main drive shaft (connected to the traction motor and reduction gearbox in the upper machine room). The drive sprocket transmits torque to the step chain, which in turn moves the escalator steps along the track. Key sprocket locations:

  • ▶Main drive sprocket: In the upper machine room, on the drive shaft output. Takes the full motor torque and step-chain tension. Requires the highest strength and most precise bore fit.
  • ▶Return/tensioning sprocket: At the lower landing, on the tensioning frame. Spring-loaded or adjustable to maintain correct step-chain tension. Subject to lower loads but still requires precision pitch engagement.
  • ▶Handrail drive sprocket: Separate smaller sprocket system driving the rubber handrail at step speed. Typically ANSI #40 or #50 standard chain — different from the step chain system.

Информация о совместимости

Application / Chain Рекомендуемая звездочка Примечания
EN 115 escalator step chain (133.33 mm pitch) Custom pitch sprocket Z=16–24 Specify exact pitch, shaft dia., tooth count
EN 115 escalator step chain (203.2 mm pitch) Custom pitch sprocket Z=18–20 Heavy-transit escalator (airport, metro)
Handrail drive chain (ANSI #50) ANSI #50 sprocket Standard stock item
Handrail drive chain (ANSI #40) ANSI #40 sprocket Light-duty indoor escalators
OTIS, Schindler, KONE escalator (brand ref only) Dimensional equivalent by drawing Provide OEM drawing or worn sample
ThyssenKrupp, Mitsubishi escalator (brand ref only) Custom sprocket to specification Material cert included

Selection Guide for Escalator Sprockets

Escalator sprockets are safety-critical components — selection must be validated against the escalator manufacturer’s specification:

📑
Step 1: Obtain OEM Specification
Contact the escalator manufacturer or consult the maintenance manual for the step-chain pitch, sprocket tooth count, shaft diameter, and keyway specification. Do not estimate — safety-critical components require exact dimensional match.
🔬
Step 2: Material & Hardness
Specify 40Cr alloy steel with case hardening to HRC 52–60 minimum for commercial escalators. For transit escalators (airport, metro) with >30,000 passengers/day, consult our engineering team for upgraded material and case-depth specification.
📋
Step 3: Documentation Package
For safety-critical escalator maintenance, request EN 10204 3.1 material certificate, dimensional inspection report, and hardness test certificate. These are required by AS 1735 and building owner maintenance programmes.
🔓
Step 4: Procurement & Approval
Submit sprocket drawings or worn sample to us for production. For non-standard pitches, prototype delivery is 10–14 working days. For production batches, 3–6 weeks. Approval by escalator service engineer required before installation.

Installation Guidance

  1. Isolation: Escalator must be taken out of service and all access points locked per AS/NZS 4600 safety requirements. Building owner notification required.
  2. Machine room access: Work in the upper machine room with all electrical isolation confirmed. Mechanical brake applied to drive shaft.
  3. Step chain removal: Use a chain-breaking tool rated for the step chain pitch and load. Support the chain to prevent sudden release and injury.
  4. Drive shaft preparation: Clean shaft and check for fretting, keyway damage. Verify shaft diameter against new sprocket bore tolerance.
  5. New sprocket installation: For large escalator drive sprockets, use a hydraulic arbor press or bearing heater to achieve correct H6/H7 fit. Torque fasteners to specification and apply thread-lock compound.
  6. Chain reinstallation & tensioning: Reconnect step chain and set tension per OEM maintenance manual. Verify step chain tension indicator on tensioning frame.
  7. Safety test: Conduct full escalator safety test per AS 1735 before returning to passenger service. Record sprocket change in maintenance log.

Поиск неисправностей

Симптом Likely Cause Action
Vibration or passenger-perceptible judder Worn sprocket teeth causing chordal action Replace drive sprockets; measure polygon effect
Loud impact noise from machine room Step chain pitch mismatch with worn sprockets Replace sprocket and step chain together
Step speed variation Progressive tooth wear on drive sprocket Measure pitch diameter; replace if >5% worn
Drive shaft fretting under sprocket hub Under-sized bore or insufficient set-screw torque Rebore or replace sprocket; apply Loctite 638
Escalator emergency stop activating Overdrive or undertorque from chain tension Check chain tension; verify step chain elongation

Примеры успешных сделок с австралийскими клиентами

“We sourced replacement drive sprockets from Ever-power for a major escalator refurbishment at a CBD shopping centre. The dimensional accuracy was confirmed by our callipers before installation — perfect match. The escalator has been running smoothly for 18 months post-refurbishment.”
— Peter R., Escalator Service Technician, Shopping Centre, Sydney, NSW · ★★★★★ · March 2025
“Airport escalators run 18 hours per day with very high passenger counts. The alloy steel sprockets with case hardening we received from Ever-power have exceeded our previous 5-year service life — now approaching 6 years with no signs of significant wear on our last inspection.”
— Amanda L., Facilities Manager, Airport Terminal, Melbourne, VIC · ★★★★★ · February 2025
— Chloe T., Building Services Contractor, Perth, WA · ★★★★★ · January 2025
“I specified Ever-power escalator drive sprockets for a major office tower refurbishment. The combination of 40Cr alloy steel, deep case hardening, and full material documentation satisfied both the building owner and the certifying engineer. Professional supplier.”
— Tony M., Engineering Consultant, Commercial Buildings, Adelaide, SA · ★★★★★ · March 2025

Часто задаваемые вопросы

► What material is required for escalator sprockets?
For commercial escalator step-chain drive sprockets, 40Cr alloy steel with case hardening to HRC 52–60 is the standard specification, meeting the fatigue life requirements of EN 115. C45 carbon steel with induction hardening is acceptable for handrail drive and lower-load return sprockets. Full material traceability documentation is required for safety-critical escalator components.
► Can I source replacement escalator sprockets without the OEM part number?
Yes. Provide us with the chain pitch (typically 133.33 mm or 203.2 mm for step chains), number of teeth, shaft diameter, keyway dimensions, and overall hub geometry (from a worn sample or measured drawing). We will manufacture to your specification.
► Is a worn escalator drive sprocket a safety issue?
Yes. AS 1735 requires regular inspection of escalator drive components, including sprockets. A sprocket with tooth wear exceeding 15% of tooth height, or any cracked, broken, or severely deformed tooth, must be replaced before the escalator is returned to passenger service.
► Do you supply documentation required for AS 1735 / EN 115 compliance?
Yes. For escalator drive sprockets, we supply EN 10204 3.1 material test certificates (confirming alloy grade and chemical composition), dimensional inspection reports, and hardness test certificates as standard inclusions. First Article Inspection (FAI) reports are available for new maintenance programmes.
► What is the typical lead time for custom escalator drive sprockets?
Non-standard pitch escalator drive sprockets (prototype) typically require 10–14 working days from receipt of approved drawing. Production batches (10+ pieces) require 3–6 weeks. Rush prototypes in 7 days may be possible for simple geometries — contact us to discuss.
► Can you supply both the drive sprocket and the return/tensioning sprocket in a matching pair?
Yes. We recommend specifying matched drive and return sprocket pairs from the same production batch to ensure pitch consistency across the step-chain loop. Provide all dimensional requirements for both positions and we will manufacture and inspect them as a matched set.
► Do escalator sprockets need to be dynamically balanced?
For escalators operating at standard step speeds (0.5–0.75 m/s), static balance of the drive sprocket is typically sufficient. For high-speed moving walkways (>0.9 m/s) or unusually large-diameter drive wheels, dynamic balance should be specified to prevent vibration at the drive station.
► What is the difference between the step-chain sprocket pitch and standard ANSI/ISO chain pitches?
Escalator step chains use specialised pitches (133.33 mm and 203.2 mm are most common) that do not correspond to standard ANSI or ISO roller chain pitches. These are purpose-designed for the escalator application and require custom-manufactured sprockets. Handrail drive chains typically use standard ANSI #40 or #50 chain — these use standard catalogue sprockets.
► Should the escalator sprocket be replaced every time the step chain is replaced?
Yes. Step chains and their mating sprockets wear together — fitting a new chain on a worn sprocket (or a new sprocket on a worn chain) causes rapid accelerated wear on the new component due to pitch mismatch. Both should always be replaced as a system.
► Can you supply sprockets for moving walkways as well as escalators?
Yes. Moving walkway (travelator) pallet-chain drive sprockets are supplied on the same basis as escalator step-chain sprockets — custom-manufactured to your dimensional specification with appropriate material and documentation. Contact our team for a quotation.

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Стандарты и сертификация

Все звездочки Ever-power Australia изготавливаются и тестируются в соответствии со следующими международными стандартами:

✓ ISO 9001:2015✓ ANSI B29.1✓ ISO 606 / DIN 8187✓ JIS B 1801✓ Стандарты BS✓ Стандарты Великобритании

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