This preview shows page 1. Sign up to view the full content.
Unformatted text preview: he valve head,
t = k · dp
= 0.42 × 60
= 7.43 say 7.5 mm Ans.
2. Stem diameter
σt = We know that stem diameter,
+ 6.35 =
+ 6.35 = 13.85 say 14 mm Ans.
We know that maximum lift of the valve,
= 17.32 say 17.4 mm Ans.
4 cos α 4 cos 30º 4 × 0.866 32.24 Rocker Arm
The * rocker arm is used to actuate the
inlet and exhaust valves motion as directed
by the cam and follower. It may be made of
cast iron, cast steel, or malleable iron. In order to reduce inertia of the rocker arm, an Isection is used for the high speed engines
and it may be rectangular section for low
speed engines. In four stroke engines, the
rocker arms for the exhaust valve is the most
heavily loaded. Though the force required
to operate the inlet valve is relatively small,
yet it is usual practice to make the rocker
* Roller followers in an engine rocker mechanism The rocker arm has also been discussed in Chapter 15 on Levers (Refer Art. 15.9). Internal Combustion Engine Parts n 1193 arm for the in...
View Full Document
This note was uploaded on 09/30/2012 for the course MECHANICAL 403 taught by Professor A.thirumoorthy during the Spring '11 term at Anna University Chennai - Regional Office, Coimbatore.
- Spring '11