Construction of kennedy key

Q.  Which type of key consists of two square tapered keys placed 90o apart?
- Published on 14 Sep 15

a. Tangent key
b. Kennedy key
c. Saddle key
d. Woodruff key

ANSWER: Kennedy key


  • Sravanthi   -Posted on 03 Nov 15
    Key: It is a mechanical element used to attach rotating elements such as gears, pulleys or sprockets. These keys prevent relative motion between them.

    Kennedy key: These keys have two square tapered keys which are placed 90° apart. Such keys are used for heavy duty applications.

    Saddle key: This key-way fits in the hub of rotating element. Friction between key and shaft is responsible for transmission of torque. Torque transmission can be increased by having lower surface of the key flat and the shaft is planed to accommodate the key.

    Woodruff key: This key is a segment from cylindrical disc which fits in the recess milled on a shaft. These keys are used in automobiles and machine tools. The disadvantage of using this key is that it cannot transmit high torque and this key also weakens the shaft as depth of keyway is more.

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