Maximum Value of Pressure Angle in the Case of Cam

The maximum value of the pressure angle in the case of a cam is kept as 30°.

Explanation:

What is a Cam?
A cam is a mechanical device that converts rotary motion into reciprocating or oscillating motion. It consists of a camshaft with an irregularly shaped cam profile and a follower that follows the contour of the cam.

Pressure Angle:
The pressure angle is the angle between the direction of the applied force and the perpendicular to the surface of contact between the cam and the follower. It determines the efficiency of power transmission and influences the wear and tear of the cam and follower surfaces.

Importance of Pressure Angle:
The pressure angle affects the forces acting on the cam and follower system. If the pressure angle is too large, it can lead to excessive wear, noise, and vibration. On the other hand, if the pressure angle is too small, the contact area between the cam and follower decreases, resulting in high stress concentrations and potential failure.

Factors Affecting Pressure Angle:
Several factors influence the pressure angle in a cam system, including the cam profile, follower type, and the desired motion characteristics. The cam profile determines the shape and contour of the cam, which directly affects the pressure angle.

Maximum Value of Pressure Angle:
In order to optimize the performance and durability of the cam and follower system, the maximum value of the pressure angle is typically limited to 30°. This value strikes a balance between ensuring sufficient contact area for load transmission and minimizing wear and stress concentrations.

Other Options:
- Option 'A' (15°) is too small and may result in reduced contact area and increased stress concentrations.
- Option 'B' (20°) is also relatively small and may not provide sufficient load transmission capability.
- Option 'D' (60°) is too large and may lead to excessive wear, noise, and vibration.

Conclusion:
To ensure optimal performance and durability of the cam and follower system, the maximum value of the pressure angle is kept as 30°. This value provides a balance between load transmission and minimizing wear and stress concentrations.