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close this bookKeyed Joints - Course: Techniques of Fitting and Assembling Component Parts to Produce Simple Units. Trainees' Handbook of Lessons
View the document(introduction...)
View the documentPreliminary Remarks
View the documentHints on Labour Safety
View the document1. Intended Use of Keyed Joints
View the document2. Types of Keys
View the document3. Types of Keyed Joints
View the document4. Kinds of Stress Acting on Keyed Joints
View the document5. Tools and Auxiliary Accessories
View the document6. Selected Technological Operations for Making Keyed Joints
View the document7. Undoing of Keyed Joints

1. Intended Use of Keyed Joints

Keyed joints are detachable joints connecting machine parts by fasteners - keys - a non-positive way.


Figure 1 - Keyed Joints

1 key, 2 shaft, 3 hub

Keyed joints are made in order to

- connect machine parts that shall perform rotational movements transmitting little to great rotary powers;

- connect machine parts that shall perform a to-and-fro movement where little to great axial force must be transmitted;

- connect machine parts in such a way that their exact position relative to one another can be adjusted.

If parts of machines are designed as keys or tapers, they can be connected immediately as a result of this shape. In this case, no additional wedges are required. Such machine parts must be adapted to one another very accurately. Advantage of keyed joints:

- Guarantee of function even with reciprocal stress in the form of shocks.

Disadvantage:

- With rotating machine parts, the accuracy of true running is not guaranteed in case of high peripheral speeds.