Oilless bushings, also known as self-lubricating bushings, are a type of plain bearing that does not require any external lubrication to operate smoothly. Instead, they are designed to work using a variety of other materials and mechanisms to minimize friction and wear.
When it comes to reducing friction and enabling smooth movement between two parts of a machine, bearings play a pivotal role. Oilless bushings take this concept to the next level by operating without the need for continuous external lubrication, making them a preferred choice in scenarios where conventional lubrication methods are impractical or undesirable.
Oilless bushings are mechanical components designed to provide low-friction movement between two surfaces. Unlike traditional bearings that require a constant supply of lubricating oils or greases to prevent wear and tear, oilless bushings incorporate specialized materials and designs that offer inherent self-lubricating properties.
Oilless bushings, also known as self-lubricating bushings, are a type of high-strength brass bearing that utilizes oil pockets for lubrication. These innovative components combine the functions of traditional bronze bushings with the advantages of high-strength brass (ZCuZn25Al6Fe3Mn4), resulting in increased hardness and extended operational lifespan. Oilless bushings offer remarkable load-bearing capabilities, making them suitable for heavy-duty applications.
Features of Oilless Bushings:
Low Maintenance Frequency: Oilless bushings require minimal maintenance due to their self-lubricating design, reducing downtime and operational costs.
Ideal for Low-Speed Heavy Loads: Unlike ball-type linear bearings, oilless bushings excel in low-speed, high-load conditions, making them a preferred choice for various industrial scenarios.
High-Temperature and Low-Temperature Suitability: Oilless bushings can operate effectively under extreme temperature conditions, ensuring reliable performance in diverse environments.
Space-Saving Design: With thinner wall thickness compared to linear bearings, oilless bushings conserve space while delivering robust functionality. Suitable for Linear and Rotary Motion: Oilless bushings are versatile components that can be utilized for both linear and rotary motion applications.
Oilless bushings come in five different materials, each tailored for specific requirements:
Copper Alloy: Resistant to high temperatures and chemicals, suitable for heavy loads and low-speed operations.
Bronze Castings: Excellent sintering resistance, suitable for small-scale operations, low loads, and high-speed applications.
Dry Type (Composite Layer): Suitable for heavy loads and low-speed applications, featuring a compact and thin-walled design.
Resin: Heat and chemical-resistant (such as PTFE resin), compliant with food safety regulations, suitable for low loads and low-speed operations. Castings: Suitable for medium loads and low-speed operations.
Types of Oilless Bushings:
Straight Column Type
Flange Integral Type
Flange Type Fixed Seat Assembly (Copper Alloy Bushing Embedded)
Threaded Bushing Type (Copper Alloy Bushing Embedded)
Flange Integral Copper Alloy Standard Inner Diameter Type
Category: Flange Type Metal: Brass Operating Environment: Standard / Oil-Containing Lubrication: Self-lubricating / Periodic Lubrication Maximum Surface Pressure: 29 N/mm² Maximum Speed: 0.5 m/s Maximum PV Value (Range): 1.1~2.0 N/mm²·m/s Maximum PV Value: 1.65 N/mm²·m/s
Here are some general steps to follow when using oilless bushings:
Ensure the bushing is compatible with the application: Check the manufacturer’s specifications to ensure the bushing is suitable for the specific application, including load capacity, temperature range, and other environmental factors.
Proper installation: Ensure that the bushing is installed properly according to the manufacturer’s guidelines. Improper installation can lead to premature failure or poor performance.
Avoid contamination: Oilless bushings are sensitive to contamination, which can affect their performance. Keep the bushings clean and free of dust, dirt, and debris.
Maintenance: Oilless bushings require less maintenance than traditional bushings, but they still need a periodic inspection to ensure they are performing properly. Check for signs of wear or damage and replace the bushing if necessary.
Types Of Oilless Bushing
There are several types of oilless bushings:
graphite plugged bronze bushing: the solid lubricant bushing, which uses a solid material, such as graphite, to provide lubrication between the bushing and the shaft. The solid lubricant slowly releases during use, providing a constant supply of lubrication without the need for oil or grease.
polymer bushing, which is made from self-lubricating plastic material. These bushings have small pockets or channels built into the surface, which trap and distribute the lubricant evenly across the surface of the bushing.
composite bushing, which uses a combination of materials, such as PTFE (polytetrafluoroethylene) and bronze, to create a low-friction surface. The PTFE acts as a lubricant, while the bronze provides strength and support.
Bronzeoilless.com employs the sophisticated technique of centrifugal casting to produce a wide range of high-quality bushes, thrust washers, and sleeves. These products are crafted using various copper alloys that adhere to global standards such as PN-EN 1982, DIN 1705, 1709, 1714, PN 91/H-87026, ASTM B271, and BS 1400. Moreover, they are not limited to standard alloys; special alloys are also employed to meet unique requirements.