Automotive Engineering I

Student Name:                                                                     Student Class Number:

 

1- (A) The following data of a four stroke engine is known as:

Cylinder swept volume (Vs), number of cylinders (n), compression ratio (r)

Indicated mean effective pressure (imep), engine rpm (N)

Engine mechanical efficiency (h m).

- Write down the following quantities using the above symbols:

* The cylinder clearance volume (VC)

 

 

* The engine brake power (Pb)

 

 

2- What are the units of the following physical quantities?

Engine swept volume

Indicated mean effective pressure

Engine angular speed

Gearbox mechanical efficiency

 

 

 

 

3- What are the differences between the following? 

Fluid coupling (fluid flywheel) and Torque converter

 

*

*

*

 

4-What are the relationships between the following  

Work (W) & Force (F)

 

Power (P) & Angular velocity (w)

 

 

5) A- What are the parts of the friction clutch and what is the function of each part?

1-

 

 

2-

 

 

3-

 

 

 

6- The clutch friction plate shown has the following:

ri = 0.07  m,      ro = 0.09 m,      m = 0.4

If this plate will fit with a single plate clutch with multiple springs with total normal force (Fn) of 2800 N. Find:

a- the mean friction radius (rm).

b- the friction force (Ff) acting on the plate due to the normal force.

c- the torque transmitted (T) by this clutch

 

 

 

 

 

 

 

 

 

 

 

7- For fixed axis gears, put the directions of motion for input shafts:

& find the output rotation speed and torques:

a) 

 

NK=  

 

TK=

 

b) 

 

NO =

 

TO =

 

 

Input shaft H                        Input shaft L
                                               

8- Complete the following table for a planetary gear system in which the sun gear is connected to the input shaft and the carrier of the planetary gears is connected to the output shaft and the annulus gear is fixed.

s = Number of teeth on the sun wheel (S) = 40

p = Number of teeth on the planetary wheel (P) = 35

a = Number of teeth on the annulus wheel (a) = 100

ht = gear system mechanical efficiency = 80%

Ninput = 3500 rpm, Tinput = 200 N.m

Condition

S

A

C

Arm fixed

 

 

0

Train locked

 

 

 

Annulus  fixed

 

0

 

i) Find the system reduction ratio (ig)

ii) Find the output speed Noutput  (NC)

iii) Find the output torque Toutput (TC)