Welcome to the MTWB Technical Q&A Center. This page addresses common engineering questions on bearing cage materials, speed limits, thermal management and vibration analysis. Our insights cover brass, steel and PEEK cages, helping you optimize selection and maintenance.
1. Shaft deflection or misalignment allowed (vibrating screens, conveyor drums, paper machines).
2. Heavy radial load and bidirectional axial load.
1. Shaft hardness <58 HRC ⇒ multiply calculated life by 0.5.
2. Grease: use NLGI grade ≥2, relubricate every 200 hours.
3. Installation: cage guide clearance 0.05–0.10 mm; larger causes squealing.
1. Load: line contact possible, but load sharing uneven (ISO 281 empirical correction).
2. Speed: limiting speed typically 40% lower than ball bearings – use formula then multiply by 0.8 safety factor.
3. Life: standard models applicable, but micro‑geometry (roughness, waviness) has large influence.
1. Shaft journal hardness requirement ≥58 HRC.
2. Many rollers – easily clogged by debris, leading to seizure.
1. Very limited radial space (gearbox linkages, rocker arm bearings, universal joints).
2. High radial load, often without inner ring (shaft journal directly ground).
1. Preload setting: cold preload = 70% of calculated value; after warm‑up, if housing temperature rises >40°C, reduce preload.
2. Re‑torque after running‑in: after 24 hours, recheck clearance (typically increases by 0.01–0.03 mm).
1. Combined load equivalent dynamic load calculation.
2. Decompose radial and axial forces per ISO 281, then calculate load on each roller.
3. Temperature affects preload – iterative calculation required.
1. Very sensitive to mounting clearance – too large causes vibration, too small causes overheating.
2. Sliding friction between roller large end and rib requires adequate lubrication.
1. Combined radial and heavy axial loads (automotive wheel hubs, differential gears, machine tool spindles).
2. Adjustable preload/clearance.
1. Roller profile: logarithmic profile recommended; contact stripe should cover >80% of roller length.
2. For large bearings (OD >500 mm), increase safety factor 1.2–1.5 due to material cleanliness scatter.
1. Edge effects need correction.
2. Load: line contact stress with roller profile correction (ISO/TS 16281).
3. Life: Lundberg‑Palmgren theory applicable.
4. Speed: limited by cage strength and lubrication method.
1. Sensitive to shaft deflection (edge stress concentration); alignment critical.
2. Roller skewing causes severe wear.
