Lecture 2

8/9/2011

1

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Types of motion:

(a) translational,

(b) rotational


Joints with:

(a) One degree,

(b) Two degrees of freedom


Links:

(a) with two nodes, (b) with three nodes,

(c) with four nodes


Simple engine mechanism


Examples of four-bar chains


8/9/2011

2

Cine film advance mechanism


Toggle linkage


Quick-return mechanism


Cam and cam follower


Cams:

(a) Eccentric,

(b) Heart-

shaped,

(c) Pear-

shaped


Cam followers:

(a) point, (b) knife, (c)roller, (d) Sliding and

oscillating, (e) Flat, (f) Mushroom.


8/9/2011

3

(a) Parallel gear axes,

(b) Axes inclined to one another.

(c) Axial teeth,

(d) Helical teeth,

(e) Double helical teeth


Two meshed gears


Simple gear train


Compound gear trains


Rack-and-pinion


Ratchet and pawl


8/9/2011

4

Belt drive


Reversed belt drives:

(a) crossed belt,

(b) (b) open belt


Types of belts


Plain journal bearing


Hydrodynamic journal bearing


Basic elements of a ball bearing


8/9/2011

5

Types of ball bearings:

a) Deep-Groove

b) Filling-Slot

c) Angular Contact

d) Double-Row

e) Self-Aligning

f) Thrust, Grooved race


Roller bearings:

a) Straight Roller

b) Taper Roller

c) Needle Roller


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Lecture 2

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