Manufacturing Principles Case Study Report Bearings

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There is a market need for a device that allows constrained relative motion between two or more parts in a rotational or linear sense without causing excessive wear. The bearing is intended to fulfill this need by providing a smooth surface and mechanism that allows a shaft or component to move independently without causing damage in the form of wear to its support. Bearings themselves can be classified in terms of the motions that they allow, the particular principle of operation that they implement and the direction of applied loads that they are capable of handling. The specific design of bearing that will be evaluated in this report is the plain bearing [1].

Plain bearings tend to be the most inexpensive type of bearing available. Key features of this type of bearing include that they are light weight, compact and have high load-carrying capacity when compared to other varieties [7].

From this a brief initial product design specification can be made:

The bearing must be:

- light weight

- compact

- easily manufactured

- able to have a high load carrying capacity

- easily machined to be smooth

Plain Bearing Design

The factor that influences the specific design of a plain bearing is the type of motion that the bearing must accommodate. The three types of motion that are applicable for use with the plain bearing are journal or friction bearing, thrust and linear. The journal bearing, which is effectively a radial or rotary bearing, is the most common application; this is where a shaft rotates inside the bearing. As the journal bearing is the most common application, it is the particular principle of operation that will be covered by this report [7].

Plain bearings acting as independen...

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... Journal Bearing Systems (Mechanical Engineering Series). Springer.

5. ISO TC 123/SC 1, 1997. ISO 4378-1:1997, Plain bearings – Terms, definitions and classification – Part 1: Design, bearing materials and their properties. ANSI.

6. ISO TC 123, 1981. ISO 4385:1981, Plain bearings – Compression testing of metallic bearing materials. ANSI.

7. Surhone, M., Timpledon, M., Marseken, S., 2010. Plain Bearing: Bearing (Mechanical), Bearing Surface, Thrust Bearing, Linear Bearing, Journal Bearing, SAE International. Betascript Publishing.

8. Shahinpoor, M., Schneider, H., 2007. Intelligent Materials. Royal Society of Chemistry Publishing.

9. Knonsari, M., Booser, E., 2001. Applied Tribology: Bearing Design and Lubrication. John Wiley & Sons.

10. Totten, G., 2006. The Handbook of Lubrication and Tribology: Theory and Practice. 2nd Edition. CRC Publications.
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