Automotive Design
Exam 1

Student Name:

No:

1- A) Write down types of clutches:
a-                                        b-                                         c-                                       d-

B) Define the following:
i- coefficient of friction (µ):

ii- pressure (p): 

C) Write down the functions of the following parts:

Part	Functions
Clutch cover	- -
The diaphragm spring in the clutch cover	- -
Clutch cover straps	- -

D) Draw the distributions of surface pressure (p) and spring normal force (F_n) on the surfaces of the clutch friction material for a new and an old clutches.

	New clutch	Old clutch
Surface pressure (p)
Spring normal force (Fn)
Which has a greater torque capacity Tc (new or old clutch)?

2- Single plate friction clutch has the following data: - outer radius (ro) = 105 mm, - inner radius (ri) = 65 mm, - coefficient of friction (µ) = 0.3, - spring force (Fn) = 3000 N, - number of rivets = 16 rivet. ASSUMING UNIFORM WEAR, Tc = n p µ pmax ri (ro^2 – ri^2) calculate: a) clutch torque capacity (Tc) b) engine maximum torque (Te) c) friction material maximum pressure (pmax)
d) if the shear strength of the rivets material (tu) is 85 MPa, the rivets cross section area (Arivet) = 5 mm^2, and the safety factor (SF) is 3. Check if the number of rivets is enough to carry the clutch torque. e) if the bolt area (Abolt) is 16 mm^2, and number of bolts (nbolt) is 6 bolts find the bolts stress.