Machine Drawing

Shaft Couplings 123

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7.5 Non-aligned Couplings

Non-aligned couplings are used to transmit power between two shafts which are not coaxial.

The following are the examples of non-aligned couplings:

7.5.1 Universal Coupling (Hooke’s Joint)

It is a rigid coupling that connects two shafts, whose axes intersect if extended. It consists of

two forks which are keyed to the shafts. The two forks are pin joined to a central block, which

has two arms at right angle to each other in the form of a cross (Fig. 7.11). The angle between

the shafts may be varied even while the shafts are rotating.

1.1 D 1.1 D

1.8 D

D

1.7 D

0.25 D

0.8 D

DD

2.6 D

1.1 D

D

1.8 D

2.2 D

Taper Sunk Key

D

0.6 D

0.5 D

0.25 D

(b)

0.6 D

PIN,

DIA5

D

D

0.25 D

D

1.8 D

0.25 D

1.6 D

1.1 D

0.6 D

0.8 D

0.5 D

2.6 D

0.6 D

2.2 D

0.5 D

0.6 D

(^1) .1 D

1.1 D

0.6 D

1.1 D

1.1 D

2.2 D

0.8 D

(a)

3.6 D

0.5 D

Fig. 7.11 Universal coupling