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A split bearing (also known as a split roller bearing or two-piece bearing) is a rolling-element bearing where the inner ring, outer ring, and roller cage are manufactured in two separate halves (typically upper and lower). This unique construction allows installation and replacement without removing adjacent components such as couplings, gears, flywheels, or impellers—dramatically reducing maintenance downtime.
Unlike conventional solid bearings that must be slipped over the shaft end, split bearings are assembled radially around the shaft at any axial position. They are widely used in heavy industries where shaft disassembly is costly, time-consuming, or impossible: conveyor pulleys, marine propulsion shafts, draglines, kilns, dryers, crushers, and steel mill cooling beds.
Split bearings operate on the same fundamental principles as conventional roller bearings (radial and thrust load support via rolling elements), but with a radially split geometry.
| Component | Split Configuration | Function |
|---|---|---|
| Outer ring (housing) | Horizontally split (two halves) | Provides raceway for rollers; clamped together with bolts |
| Inner ring (race) | Horizontally split (two halves) | Mounts onto shaft; transmits radial load to rollers |
| Roller cage | Split (hinged or two-piece) | Retains and spaces rollers; prevents roller-to-roller contact |
| Rollers | Cylindrical or tapered (full complement or caged) | Carry radial and axial loads |
Assembly sequence:
Lower half of outer ring (housing) is placed in support pedestal
Lower half of inner ring is positioned on the shaft (no axial sliding required)
Lower roller cage + rollers are placed into lower raceway
Upper halves of inner ring, cage, and outer ring are assembled sequentially
Bolts are torqued to specification, clamping the bearing together
Because the bearing is assembled around the shaft, there is no need to access the shaft end or move adjacent equipment.
Most common type; ideal for radial loads with moderate thrust capacity (via flanged rollers or separate thrust bearings).
| Feature | Description |
|---|---|
| Roller shape | Cylindrical (straight or with integral flanges for thrust) |
| Load capacity | High radial; low-to-moderate axial |
| Typical size range | 50 mm – 1200+ mm bore |
| Typical application | Conveyor pulleys, dryer rolls, fan shafts |
Designed for combined radial and high thrust loads (e.g., screw conveyors, marine shaft lines).
| Feature | Description |
|---|---|
| Roller shape | Tapered (cone) – rollers and raceways conical |
| Load capacity | High radial + high axial (one direction) |
| Mounting | Requires axial preload adjustment |
| Typical application | Screw conveyors, thrust blocks, wheel hubs |
Accommodates angular misalignment; split designs are complex and available from specialized manufacturers.
| Feature | Description |
|---|---|
| Roller shape | Spherical (barrel) with double row |
| Self-aligning | Yes (up to ±1–2°) |
| Typical application | Misaligned shafts in cement kilns, rotary dryers |
| Parameter | Solid Bearing | Split Bearing |
|---|---|---|
| Replacement time | Hours to days (requires shaft end access) | 30 minutes to 2 hours |
| Equipment removal needed | Couplings, gears, seals, bearings on same shaft | None – bearing installed in situ |
| Labor required | Multiple trades (millwright, rigging, crane) | One millwright (small crew) |
Cost impact: Split bearings typically reduce maintenance downtime by 80–90% compared to solid bearings in congested shaft lines.
Can be installed at any axial location on the shaft (not only from ends)
No heating required (conventional bearings often require induction heating for interference fit)
No hydraulic tools needed for mounting (except for large tapered bores)
Suitable for stepped shafts or shafts with integral components (gears, cams)
Upper half removal allows direct inspection of rolling elements and raceways without bearing dismount
Rollers and cage can be replaced individually (unlike solid bearings where entire bearing is scrapped)
Lubricant inspection – open upper half; visually check grease condition
Modern split bearings (properly designed and installed) achieve 90–98% of the dynamic load rating (C) of equivalent solid bearings. The split interface does not significantly compromise load capacity when:
Halves are accurately machined (matched sets)
Bolts are torqued to correct preload
Dowel pins or step joints prevent radial shift
| Parameter | Cylindrical Split Bearing | Tapered Split Bearing |
|---|---|---|
| Bore diameter | 50 mm – 1,200 mm | 80 mm – 600 mm |
| Outer diameter | 100 mm – 1,500 mm | 150 mm – 800 mm |
| Width | 30 mm – 400 mm | 50 mm – 300 mm |
| Dynamic load rating (C) | 50 – 5,000 kN | 100 – 3,000 kN |
| Static load rating (C₀) | 100 – 10,000 kN | 200 – 5,000 kN |
| Speed limit (grease) | 500 – 3,000 RPM | 300 – 1,500 RPM |
| Operating temperature | –30°C to +150°C (standard seals) | –20°C to +120°C |
| Misalignment capacity | <0.5° (cylindrical) | <0.25° (tapered) |
| Step | Action |
|---|---|
| 1 | Clean shaft surface; remove burrs |
| 2 | Place lower housing (outer ring half) into pedestal |
| 3 | Position lower inner ring half on shaft (use feeler gauges to check gap) |
| 4 | Install lower cage with rollers into lower raceway |
| 5 | Apply lubricant (grease or oil) to rollers and raceways |
| 6 | Assemble upper inner ring half; check joint alignment (dowel pins or step joints) |
| 7 | Install upper cage + rollers; ensure cage halves latch or bolt together |
| 8 | Assemble upper outer ring half; install bolts |
| 9 | Tighten bolts in cross-sequence to specified torque (typically 50–400 N·m depending on size) |
| 10 | Verify shaft rotation (should be smooth, no binding) |
| Step | Action |
|---|---|
| 1 | Remove bolts from outer ring housing |
| 2 | Lift upper outer ring half |
| 3 | Remove upper cage + roller assembly |
| 4 | Remove upper inner ring half (may require jacking screws) |
| 5 | Repeat for lower halves (or inspect in place) |
No shaft movement required during entire process.
| Failure Mode | Root Cause | Preventive Measure |
|---|---|---|
| Uneven load distribution | Split halves misaligned during assembly | Use dowel pins or step joints; torque bolts evenly |
| Premature roller/raceway wear | Contamination ingress at split joint | Apply sealant at split interface; use sealed split bearings |
| Bolt loosening | Vibration or incorrect torque | Use locking hardware (Nord-Lock washers, Loctite); re-torque after 24 hours |
| Inner ring rotation on shaft | Insufficient interference fit (split bearings have less interference than solid) | Use tapered adapter sleeves or locknuts; apply retaining compound |
| Cage fracture | Misalignment or shock loads | Use bronze or polyamide cages for shock applications |
| Corrosion at split joint | Moisture ingress | Apply anti-seize or corrosion inhibitor during assembly |
| Industry | Application | Bearing Type | Benefit |
|---|---|---|---|
| Bulk material handling | Conveyor head/tail pulleys, idler rolls | Cylindrical split | Replace without removing belt or pulley |
| Marine | Propeller shafts, rudder stocks, stern tube bearings | Tapered or cylindrical split | In-water bearing replacement |
| Mining | Draglines, shovels, crusher shafts | Cylindrical split (large bore) | Reduce downtime in remote locations |
| Cement | Rotary kilns, dryers, coolers (support rollers) | Spherical or cylindrical split | High temp; limited shaft access |
| Steel mills | Cooling bed shafts, run-out table rolls | Cylindrical split | High heat; limited space |
| Paper | Dryer rolls, calendar stacks | Cylindrical split | Avoid breaking dryer siphons |
| Wind energy | Main shaft bearings (some designs) | Tapered split | Replace without removing rotor |
| Pulp & paper | Digestors, drum barkers | Split cylindrical | Corrosive environment; limited shaft access |
When specifying a split bearing, determine:
| Criterion | Key Questions |
|---|---|
| Shaft diameter | Exact dimension (mm or inches); tolerance (h6, h7, j6 typical) |
| Loads | Radial (kN) + axial (kN); direction (one-way or reversing) |
| Speed | Operating RPM; critical speed of shaft |
| Operating temperature | Ambient + bearing-generated heat; seal material limits |
| Lubrication method | Grease (relubrication intervals) or oil circulation |
| Environmental conditions | Dust, moisture, chemicals, washdown |
| Access constraints | Is there any shaft end access? How many adjacent components? |
| Existing housing | Will bearing fit into standard pillow block or custom pedestal? |
| Sealing requirement | Labyrinth, V-ring, contact seals, or split seal assemblies |
| Replacement urgency | Stock standard sizes vs. custom manufacture (lead time 2–12 weeks) |
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