Question

which of the following does not affect clutch torque carrying ability?

○ a. diameter and number of clutch discs in the assembly

○ b. coefficient of friction of the clutch facings

○ c. length of the clutch pedal

○ d. total spring force clamping parts together

Explanation:

To determine which factor does not affect clutch torque - carrying ability, we analyze each option:

• Option a: The diameter and number of clutch discs affect the friction area and the number of friction surfaces. A larger diameter or more discs can increase the torque - carrying ability as the friction force is related to the area and the number of surfaces.
• Option b: The coefficient of friction of the clutch facings is a key factor in determining the friction force. A higher coefficient of friction means a greater friction force, which in turn affects the torque - carrying ability (since torque from friction is related to the friction force).
• Option c: The length of the clutch pedal is related to the mechanical advantage for operating the clutch (like how much force is needed to press the pedal), but it has no direct relation to the torque - carrying ability of the clutch itself. The torque - carrying ability depends on factors related to friction (like number of discs, friction coefficient, clamping force) rather than the pedal length.
• Option d: The total spring force clamping the parts together affects the normal force between the clutch surfaces. According to the friction formula \(F = \mu N\) (where \(F\) is friction force, \(\mu\) is coefficient of friction, and \(N\) is normal force), a greater normal force (from spring clamping) leads to a greater friction force and thus affects the torque - carrying ability.

Answer:

c. Length of the clutch pedal