Motorcycle crankshaft bearing
Motorcycle crankshaft bearings are engine components installed between the crankshaft and engine housing. They support the crankshaft under high-speed rotation while maintaining alignment and reducing friction.
These bearings operate under continuous combustion load, vibration, and elevated temperatures. Their performance directly affects engine efficiency, mechanical stability, and service life.
BMT has been producing industrial bearings since 2004, supplying components for motorcycle and engine systems used in different operating conditions.
Function in Engine System
Crankshaft bearings are responsible for:
- Supporting radial and axial loads generated by combustion
- Maintaining crankshaft alignment during high-speed rotation
- Reducing friction between rotating and fixed engine parts
- Absorbing vibration and impact loads from the piston system
Key Engineering Features
- High load-bearing capacity for combustion engine environments
- Heat-treated steel for improved hardness and fatigue resistance
- Precision grinding for stable shaft rotation and clearance control
- Surface treatment to reduce wear under oil-film lubrication
- Structural design optimized for continuous high-speed operation
Operating Considerations
Crankshaft bearings operate under high temperature, high pressure, and continuous cyclic loading. Lubrication quality and oil cleanliness are critical factors affecting bearing lifespan.
Contaminated oil, improper installation, or insufficient lubrication may lead to increased wear, abnormal noise, or engine vibration.
Technical Parameters
The following table lists common crankshaft bearing models used in motorcycle engines. Selection depends on engine design, load requirements, and installation dimensions.
| Model | Size | d (mm) | D (mm) | B (mm) | Cr (kN) | C0r (kN) |
|---|---|---|---|---|---|---|
| 60/22 | 22×44×12 | 22 | 44 | 12 | ≈9.4 | ≈5.05 |
| 60/28 | 28×52×12 | 28 | 52 | 12 | ≈12.5 | ≈7.4 |
| 60/32 | 32×58×13 | 32 | 58 | 13 | ≈13.25 | ≈8.38 |
| 62/22 | 22×50×14 | 22 | 50 | 14 | ≈14.0 | ≈7.65 |
| 62/28 | 28×58×16 | 28 | 58 | 16 | ≈19.8 | ≈9.75 |
| 62/32 | 32×65×17 | 32 | 65 | 17 | ≈29.4 | ≈13.1 |
| 63/22 | 22×56×16 | 22 | 56 | 16 | ≈18.2 | ≈9.25 |
| 63/28 | 28×68×18 | 28 | 68 | 18 | ≈29.6 | ≈14.0 |
| 63/32 | 32×75×20 | 32 | 75 | 20 | ≈33.0 | ≈16.9 |
| 6304 | 20×52×15 | 20 | 52 | 15 | ≈17.65 | ≈7.85 |
FAQ
What is a motorcycle crankshaft bearing used for?
It supports the crankshaft in the engine block, allowing controlled rotation under combustion load. It also maintains alignment, reduces friction, and helps stabilize engine operation.
How do I know if a crankshaft bearing is worn?
Common signs include abnormal engine noise, increased vibration, metal particles in engine oil, reduced performance, or difficulty starting. Early inspection is recommended to avoid further engine damage.
Can crankshaft bearings be replaced without professional tools?
Replacement typically requires engine disassembly, specialized tools, and controlled assembly conditions. Incorrect installation may lead to alignment errors or premature failure.
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60/22 Motorcycle Crankshaft Bearing
BMT Bearing brings 25+ years of expertise in precision bearings. Our 60/22 Motorcycle Crankshaft Bearing is engineered for high-RPM stability, heat resistance, and long service life. We provide OEM and aftermarket buyers stable supply, ISO/IATF quality control, and tested real-world performance.
As a reliable manufacturer and supplier of Bearings in China, we have our own factory. If you are looking to purchase high-quality Bearings. please contact us.
