
204 LIGHT AND HEAVY VEHICLE TECHNOLOGY
Trunnion blocks
Figure 12.8 Rotary piston sealing grid
The metallurgy of apex seal and chamber surface
compatibility has received considerable attention from
Wankel engine researchers, and resulted first in the use
of hard carbon and then later special metallic materials
for the apex seals. Cast iron piston ring material is
employed for the curved sealing strips that bridge the
apex seals. This material is also used for the rotary
piston oil control rings, which are taper faced and
perform the dual function of preventing oil from passing
into the combustion space while the engine is running
and from drainin ...