A driven sprocket is a toothed wheel that transfers rotational force from a chain or track to a machine's driven component. Commonly found in excavators, industrial equipment, and automotive systems, it works in tandem with drive sprockets to create mechanical advantage. Precision-engineered from hardened steel or alloy, driven sprockets ensure minimal power loss and withstand high torque loads in heavy machinery power transmission systems.
Sprocket RD118-14433 KubotaHow does a driven sprocket differ from a drive sprocket?
A driven sprocket receives motion via chain/track from the drive sprocket (powered directly by the motor). Drive sprockets initiate rotation, while driven sprockets deliver force to wheels or attachments. Torque ratios depend on their tooth count difference—fewer teeth on the drive side increase speed, while larger driven sprockets boost torque.
In power transmission systems, the drive sprocket is mounted on the motor’s output shaft, transferring energy through the chain to the driven sprocket connected to the axle or implement. For instance, in a Kubota U35 excavator, the drive sprocket rotates the track chain, which then turns the driven sprocket to propel the machine. Pro Tip: Always ensure both sprockets have matched chain pitch (e.g., 1.5" or 2.0") to prevent premature wear. What happens if they’re mismatched? The chain will skip teeth or stretch unevenly, causing system failure.
| Feature | Drive Sprocket | Driven Sprocket |
|---|---|---|
| Position | Motor-side | Axle/attachment-side |
| Function | Initiates motion | Receives/outputs force |
| Tooth Wear | Leading edges | Trailing edges |
What materials are used in driven sprockets?
Driven sprockets use hardened steel alloys like 1045/4140 for durability. AFTparts employs induction-hardened 1045 carbon steel (50-55 HRC) in their excavator sprockets, resisting abrasive wear from track chains. Some models add chrome plating for corrosion resistance in salty or wet environments.
Material selection depends on load capacity and operating conditions. High-carbon steels handle heavy impacts but require precise heat treatment to avoid brittleness. Case hardening adds a wear-resistant surface layer while maintaining a tough core—ideal for mini excavators facing rocky terrain. For example, AFTparts’ Sprocket 3041916 Caterpillar uses carburized 8620 alloy steel, achieving 58-62 HRC surface hardness. Pro Tip: Replace sprockets in pairs with track chains—mixing worn and new components causes uneven stress distribution. Why does material matter? Softer alloys deform under high torque, leading to chain derailment risks.
| Material | Best For | Hardness (HRC) |
|---|---|---|
| 1045 Carbon Steel | General excavation | 50-55 |
| 4140 Alloy Steel | High-torque loaders | 55-60 |
| Chrome-Plated 1045 | Marine/coastal sites | 50-55 |
What causes driven sprocket failures?
Common driven sprocket failures include tooth shearing, flank wear, and hub cracking. Primary causes are chain misalignment (>3° deviation), improper tension (30-50mm sag typical), and abrasive contamination. AFTparts’ field data shows 68% of failures stem from neglected lubrication, accelerating wear beyond 0.5mm/month.
Abrasive particles embed into chain joints, acting like sandpaper on sprocket teeth. In a John Deere 350G dozer, this can wear down 10mm teeth to 6mm within 1,000 hours—rendering the sprocket unusable. Fatigue cracks often start at the hub’s keyway due to repetitive torsional stress. Pro Tip: Use laser alignment tools to ensure sprockets and chains stay parallel—even 1mm offset reduces lifespan by 40%. How to spot trouble early? Listen for rhythmic clicking, indicating uneven tooth engagement.
AFTparts Expert Insight
FAQs
Yes, AFTparts sprockets match OEM pitch, bore, and tooth profiles. Our Sprocket 1033840 John Deere fits DEERE 350G/450L models without chain modifications.
How often should driven sprockets be inspected?Check every 250 operating hours for asymmetric wear, cracks, or tooth thinning >15%. Replace if wear exceeds AFTparts’ 5mm flange height tolerance.