MECHANICAL ENGINEERING DEPARTMENT

JM609 – POWER TRANSFER MECHANISMTITLE : CAM

NAME MATRIC NO.

MOHAMAD FARIQ AZZAD BIN MD ALI 16DEM10F1034MUHAMMAD HAZMIN BIN AZAMI 16DEM10F1024ROSYADA BT ABD HALIM 16DEM10F1025ADEEL ESFAL BIN ROSLI 16DEM10F1077

Cams convert rotary oscillating or linear motion into a linear or reciprocating action to carry out useful work.

The cams are classified according to : (a) Shape, (b) Follower movement, and (c) Manner of constraint of the follower

Plate cam

Face cam

Cylindrical cam

End cam

Plate cam•Sometimes called a disc, radial or edge cam.

•The follower moves in a plane perpendicular to the axis of rotation of the camshaft.

Cylindrical cam•Sometimes called a barrel cam.

• It’s curved surface has a groove machined, within which a follower is contained. The movement is parallel to cam axis.

Face cam•Groove cut within which a constrained follower moves.

• The groove ensures no need for a return spring.

End cam

•The cylindrical cam has the profile machined on the end.•a rotating portion of a cylinder .

• The follower translates or oscillates, whereas the cam usually rotates.

Roller

Wedge or Knife Type

Flat Ended

Wedge or Knife type•It is not often used as it wears rapidly, due to the high frictional forces.

•It can also track profiles in both directions.

RollerThe advantage that wear is minimised, due to the roller action. The profile of the cam and roller radius must not conflict.

If the profile is smaller than the radius of the roller then the roller will follow the incorrect path.

Flat ended•This cannot be used for concave profiles.

•It wears slower than a knife-edge follower, points of contact move across the surface of the follower.

•These are often offset and allowed to spin.

CAM USE Camshaft of an

Engine The use of cam and

follower systems are vital in engines, where they are used to open and close the inlet valve and the exhaust valve to the cylinder head

CAMSHAFT OF AN ENGINE INCORPORATING A ROCKER ARM

In this case the motion of the cam imparts on the follower is translated to the valve through a push rod and the rocker arm.

THE MOVEMENT TYPE IN FOLLOWER

Motion events

THE CAM MOTION OR PROFILE The motion of the cam follower

depends upon the profile or shape of the cam. Therefore the profile determines the resultant action.

Sample Video’s

Sample Video’s

Sample Video’s