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.
Overview
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.
技術仕様
| パラメータ | Escalator Value | 注記 |
|---|---|---|
| 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 |
| 材料 | 40Cr alloy steel | C45 for lower-load applications |
| 歯の硬度 | HRC 52–60 | Case-hardened alloy steel |
| ケースの奥行き | 2.0–4.0 mm | Deeper for heavy transit escalators |
| 内径公差 | H7 / H6 | Precision fit for drive shaft |
| Shaft Diameter | 50–120 mm | Escalator-dependent |
| ハブスタイル | Solid hub with keyway | Split hub on request for in-situ access |
| Surface | 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 |
| 動作温度 | −5°C to +50°C | Machine room range |
| Noise Level | ≤70 dB (drive station) | Passenger comfort requirement |
| Standard | 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 mm | Vibration critical |
| Tooth Profile | Precision involute | Custom profile on request |
| Documentation | Material cert + dimensional report | Safety-critical application |
Performance Advantages
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.
互換性情報
| Application / Chain | Recommended Sprocket | 注記 |
|---|---|---|
| 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 スプロケット | Standard stock item |
| Handrail drive chain (ANSI #40) | ANSI #40 スプロケット | 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:
Installation Guidance
- Isolation: Escalator must be taken out of service and all access points locked per AS/NZS 4600 safety requirements. Building owner notification required.
- Machine room access: Work in the upper machine room with all electrical isolation confirmed. Mechanical brake applied to drive shaft.
- 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.
- Drive shaft preparation: Clean shaft and check for fretting, keyway damage. Verify shaft diameter against new sprocket bore tolerance.
- 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.
- Chain reinstallation & tensioning: Reconnect step chain and set tension per OEM maintenance manual. Verify step chain tension indicator on tensioning frame.
- Safety test: Conduct full escalator safety test per AS 1735 before returning to passenger service. Record sprocket change in maintenance log.
Troubleshooting
| 症状 | 考えられる原因 | 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 |
Australian Customer Case Studies
“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.”
“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.”
— 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.”
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