Philippine Agricultural Engineering Standard - Journal Bearings

A type of bearing that provides support to a rotating shaft or journal by using a sliding contact surface.

This standard sets guidelines for the design, selection, and use of journal bearings specifically for agricultural machinery.

The degree to which a material can withstand pressure without deforming or permanently changing shape.

The ability of a material to resist wear and tear from friction.

The ability of a bearing to withstand high temperatures without losing its structural integrity.

The ability of a bearing to maintain its shape and function under varying temperatures.

The thickness of the lubricant film between the bearing surface and the rotating shaft, crucial for reducing friction and wear.

This standard ensures the proper application of journal bearings in agricultural machines for optimal performance, efficiency, and longevity.

A type of bearing where the shaft rotates within a cylindrical sleeve filled with a lubricating fluid. The fluid pressure keeps the moving parts separated, preventing direct contact.

The part of the shaft that rotates within a bearing. It can be an axle, roll, or spindle.

A substance that reduces friction between surfaces in contact, preventing wear and tear. It can be oil, grease, or other fluids.

A bearing where the fluid pressure supporting the load is generated by the movement of the shaft itself. The fluid adheres to the surfaces and is pressurized due to the bearing's shape.

A bearing where the fluid pressure supporting the load is generated by an external source. The fluid is pumped into the bearing, creating the necessary pressure.

The space between the rotating journal and the inner surface of the bearing. This gap allows the lubricant to circulate and prevent contact.

The distance between the center of the journal and the center of the bearing.

The load supported by the bearing, measured in force units.

A type of lubrication where a thin film of lubricant directly contacts and adheres to the bearing surfaces, creating a boundary layer that reduces friction.

Bearings that operate without a significant fluid film, relying on low-friction materials or materials impregnated with lubricants to minimize wear.

The diameter of the shaft that fits inside the bearing.

The length of the journal bearing along the shaft.

The thickness of the bearing's wall.

A soft metal alloy, typically lead-based, used in journal bearings to provide low friction and good wear resistance.

A synthetic polymer with excellent lubricity and resistance to chemicals, often used in dry bearings or low-friction applications.

The space between the journal or shaft and the bearing surface. This space allows for lubrication and prevents metal-to-metal contact.

Measured in millimeters, minimum clearance helps determine the appropriate size of journal bearing for a specific application.

The clearance requirement varies based on the diameter of the journal or shaft. This is represented on the PAES 310:2001 chart.

For every 1 mm increase in journal diameter, the minimum clearance increases by 0.05 mm.

Minimum clearance is essential to prevent wear and tear, ensure smooth operation, and extend the life of the bearing.

Improper clearance can lead to excessive wear, bearing failure, and reduced performance.

PAES 310:2001 helps engineers and designers select the right journal bearing for various machinery applications.

The minimum clearance between a rotating journal and the bearing is determined by the bearing's diameter, speed, and the load it carries. This clearance ensures proper lubrication and prevents wear and tear.

The graph shows the relationship between the journal diameter, speed, and the minimum clearance required for steadily loaded bearings. This graph helps determine the appropriate clearance for different operating conditions to ensure optimal performance and longevity.

The graph demonstrates the variation in minimum clearance requirements for dynamically loaded bearings, where forces change direction and magnitude. This curve considers the impact of fluctuating loads on bearing performance.

Heat generated by friction between bearing surfaces. This heat can cause wear, damage, and ultimately lead to premature bearing failure.

The speed at which the bearing rotates, typically measured in revolutions per minute (RPM). Higher speeds often require greater clearance for proper lubrication and cooling.

The coefficient of friction between the bearing surfaces. A lower coefficient of friction reduces heat generation and wear. This depends on the materials used and lubricant properties.

The diameter of the rotating journal, which directly influences the minimum clearance required for proper lubrication.

The space between the rotating shaft and the bearing, allowing room for the lubricant to flow and prevent direct contact between the moving parts, reducing friction and wear.

This refers to the load applied to a bearing that remains constant over time. These bearings require specific clearance calculations to ensure optimal operation under steady conditions.

These bearings are subjected to changing forces or loads, requiring greater clearance to accommodate the movement and prevent premature wear. These are crucial for applications involving vibration or shock.

The ability of a material to withstand pressure without deforming or permanently changing shape. This is crucial for bearings to maintain their structural integrity under load.

The ability of a material to resist wear and tear from friction. This is essential for bearings to maintain their shape and function over time.

The ability of a bearing to withstand high temperatures generated by friction without losing its structural integrity. This is vital for bearings operating in high heat environments.

A factor used to estimate heat load in journal bearings, calculated by multiplying bearing pressure by sliding velocity.

The maximum allowable PV factor for a specific bearing material, beyond which bearing life is significantly reduced.

The maximum allowable pressure a bearing can withstand at rest.

The maximum allowable pressure a bearing can withstand while in motion.

The speed at which the journal slides within the bearing, measured in meters per second.

The ability of a bearing to maintain its shape and function under varying operating conditions, including temperature changes.

The thickness of the lubricant film between the bearing surface and the rotating shaft, crucial for reducing friction and wear.