Thrust Washer

Thrust washers can be found in almost every appliance, machine, transportation conveyance, power tool, and recreational device that has moving parts, axles, bolts, pins, bearings, and rotating components. In their simplest form, thrust washers are long-wearing flat bearings in the shape of a washer that transmit and resolve axial forces in rotating mechanisms to keep components aligned along a shaft.

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Detailed Description for Thrust Washer

Thrust washers can be found in almost every appliance, machine, transportation conveyance, power tool, and recreational device that has moving parts, axles, bolts, pins, bearings, and rotating components. In their simplest form, thrust washers are long-wearing flat bearings in the shape of a washer that transmit and resolve axial forces in rotating mechanisms to keep components aligned along a shaft. Thrust washers are an economical alternative to rolling thrust bearings whenever forces velocities are moderate.

The need for thrust washers presented itself in antiquity almost as soon as the wheel was invented. These rugged washer shaped flat bearings are used to prevent wheels from moving sideways on axles whenever the bearing that handles the radial load such as a bushing or roller bearing has no specific provision for axial or thrust loads. Typical sideways or axial loads are encountered whenever turning a corner and the vehicle is thrust sideways towards the outside of the curve. Other applications from our ancestors would have been grain mills, water wheels, turntables, and rotary drills, wherever the primary movement may have had both radial and axial forces to contend with. Of course, propeller shafts on every propeller driven vessel from the largest to the tiniest must have thrust bearings to resolve the linear and axial propulsion forces of spinning propellers either forward or backward.

Construction

  • Thrust washers are made from many different materials, and are selected for the best combination of performance, maintenance and price. Most hardened steel shafting applications will use an Oilite type of washer which is a very porous bronze material that can contain more than 30% oil by volume. As such, Oilite is self-lubricating.

  • Common Applications

    • Virtually every appliance electric motor has at least one thrust washer in it to control axial displacement, also known as end play. The propeller shaft on most inboard and outboard boats uses at least one thrust washer to transmit the axial thrust of a spinning propeller into forward or backward motion. Turntables of all kinds use thrust washers both as weight bearings as well as erratic motion dampers.

    Disadvantages

    • As all sliding rather than rolling bearings do, thrust washers do consume a portion of the rotational energy in the system as friction. So their efficiency is always less than a ball or roller bearing type thrust bearing system.


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