Journal Plain Bearing | Online Calculator

Bearing Calculators

Journal Plain Bearings

In this calculation, a journal support bearing with circulating lubrication and a steel-babbit friction pair is considered. The calculation was carried out based on the methodology for calculating marine plain bearings repeatedly confirmed by practical results.

To perform the calculations, it is necessary to specify the shaft neck diameter D, bearing support part length L, radial load F, rotational speed n and diametral clearance between the shaft neck and the bearing support part Δ. The calculation of the heat balance is outside the scope of these calculations, so the oil dynamic viscosity μ is set at operating temperature.

As a result of calculations, the power P generated on the bearing support, thickness of the oil wedge Y and minimum oil supply Q necessary to ensure the operation of the bearing are determined.

Journal plain bearings calculation
Journal plain bearings heat calculation

INITIAL DATA

F - Radial load;

n - Shaft speed;

D - Shaft diameter;

L - Bearing length;

Δ - Diametral clearance between the shaft and the inner diameter of the bearing;

μ - Dynamic oil viscosity at service temperature.

RESULTS DATA

P - Power, released during bearing operation;

y - Oil wedge;

Q - Minimum oil consumption.

Radial load (F)

Shaft speed (n)

Shaft diameter (D)

Bearing length (L)

Diametral clearance (Δ)

Dynamic oil viscosity (μ)

Output power (P)

Oil wedge (y)

Oil concumption (Q)

BASIC FORMULAS

Bearing calculation is performed using complex systems of parametric equations.

INITIAL DATA

F - Radial load;

n - Shaft speed;

D - Shaft diameter;

L - Bearing length;

Δ - Diametral clearance between the shaft and the inner diameter of the bearing;

μ - Dynamic oil viscosity at service temperature;

RESULTS DATA

P - Power, released during bearing operation;

y - Oil wedge;

Q - Minimum oil consumption.

DYNAMIC OIL VISCOSITY

Oil

Viscosity at 55°C (131°F)

Pa*s (lb*s/ft²)

SAE 15W-40

0.045 (0.00100)

SAE 10W-60

0.074 (0.00155)

SAE 0W-30

0.032 (0.00067)

OTHER CALCULATORS

AREA MOMENTS OF INERTIA
BEAM CALCULATORS
TORSION OF BARS
CIRCULAR FLAT PLATES
BUCKLING
ELASTIC CONTACT
IMPACT LOADS
NATURAL FREQUENCIES
PRESSURED SHELLS
FLUID DYNAMIC
COMPOSITES
SPRINGS
THREAD CONNECTIONS
SHAFT CONNECTIONS
BEARINGS
DRIVES
FATIGUE
HEAT TRANSFER