Forging new generations of engineers. CAMS, Eccentrics, and Ratchets.

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Presentation transcript:

Forging new generations of engineers

CAMS, Eccentrics, and Ratchets

CAMS ARE MECHANICAL DEVICES THAT CHANGE ROTARY MOTION TO LINEAR MOTION CAM ROTARY MOTION LEVER LINEAR MOTION

CAM Followers and Linkages Transfer the Linear Motion of the CAM Lobe to the place where it is used

CAM Lobe Parts Toe Flank Heel Ramp Base Circle

CAM Lobe Lift

CAM Displacement Graph AS ECCENTRIC CAM ROTATES ONE REVOLUTION OR 360 DEGREES THE MOVEMENT OF THE FOLLOWER IS SHOWN BY THE LINE ON THE GRAPH. AT 180 DEGREES THE FOLLOWER IS AT ITS MAXIMUN HEIGHT.

Basic CAM Shapes CircleHeart AccelerationPear

Flat Plate CAM With Roller Follower

Groove Box CAMGrooved Flat Plate CAM Groove Box and Grooved Flat Plate Cam

CYNDRICAL CAM and FACE CAM Both provide a rocking motion

Peripheral cams are the most widely used form of an eccentric cam In the peripheral cam, a follower rides on the outside edge of the cam The high spot on the cam is called the lobe The low spot is called the dwell Cams can also move the follower at different levels Peripheral CAMS

Eccentric and Strap The eccentric is inside a device called an eccentric strap The eccentric is used where heavy loads are moved The strap is connected to a link or rod which in turn is fastened to a pivot on an object which moves linearly

Cloverleaf and Swash plate CAM Cam Variations Cloverleaf –drives the follower bar in both directions Swash plate –provides rocking motion

Different Style of a Swash Plate CAM

Types of CAM Followers POINT SLIDING ROLLER ANGLE

Using CAMS Rotating CAM Controls the operation of a car distributor 3 Port pneumatic valve is opened and closed

Using CAMS In Gas Engines

Small Engine CAM Car Engine Cams Engine CAMS

Eccentric CAMS Concentric Circle Eccentric Circle

Fuel Pump Design Using An Eccentric CAM

Connecting Rods Sometimes called coupling rods these are used to transfer energy from one moving part to another, without using gears or axles Used to synchronize the movement of parts, to convert rotary motion to oscillating movement

Ratchet Wheel And Pawl

Types Of Ratchets and Pawls

Ratchet Wheel and Pawl Used To Arrest Motion

Fishing Reel Uses a Ratchet Wheel and Pawl

Hand Crank Winch Using a Ratchet and Pawl

Come Along Uses A Ratchet Wheel and Pawl

Answer The Following What is a CAM? What Does a CAM Do? Name 5 Different Types Of CAMs. What is a Follower? Name 4 Types of Followers. What is a Ratchet? What is a Pawl? What is a Ratchet and Pawl used for? What is an Eccentric?