cams with specified contour
TRANSCRIPT
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PRESENTATION ON
CAMS WITH SPECIFIED CONTOURS
GUIDED BY:- Prof. Hardik PatelKinematics of Machines
SUBMITTED BY:HIMANSHI GUPTA(140120119057) / ME / A1PRACHI SHARMA(140120119216) / ME / A1VIDISHA VYAS(140120119253) / ME / A1
(2131906)
GANDHINAGAR INSTITUTE OF TECHNOLOGY
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INTRODUCTION
• A cam is a rotating machine element which gives reciprocating or oscillating motion to another element known as follower
• Cam and follower constitute higher pair• Cam-uniform speed• Follower-pre-determined motion
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CAMS WITH SPECIFIED CONTOURS
• When the follower moves with the specified motion, the shape of the cam profile thus obtained is difficult and costly to manufacture
• So cams with specified contours are specified and motion of follower is determined
• Cam profiles consisting of circular arcs and straight lines are preferred
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TANGENT CAM WITH RECIPROCATING ROLLER FOLLOWER
TANGENT CAM:-• Flanks of the cam are straight and tangential to
the base circle and nose circle• Used for operating inlet and exhaust valve of
IC Engines
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• Two cases for derivation of displacement, velocity and acceleration expressions:
1. When the roller has contact with the straight flanks
2. When the roller has contact with the nose
TANGENT CAM WITH RECIPROCATING ROLLER FOLLOWER
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• Terms used:
TANGENT CAM WITH RECIPROCATING ROLLER FOLLOWER
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• CASE 1: WHEN THE ROLLER HAS CONTACT WITH STRAIGHT FLANK
Displacement:
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Velocity is given by:
Velocity is maximum where θ is maximumThis happens when roller just leaves the contact with the straight flank at G i.e. when θ=ф
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Acceleration is given by:-
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• CASE 2: WHEN THE ROLLER HAS CONTACT WITH THE NOSE
DISPLACEMENT:
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• VELOCITY
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• ACCELERATION
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• The velocity is zero at H and maximum at G• The acceleration is minimum at H and
maximum at G
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