Top land
The top land is of pistons in piston engines of the top web with internal combustion. It thus extends from the piston head or the piston crown to the first groove for receiving a piston ring . Together with the other grooves and ring webs, it forms the so-called ring belt, the task of which is to separate the variable working area from the engine room . The top land is directly exposed to the hot, corrosive combustion gases, but does not, or only rarely , touch the cylinder surface during normal operation . The wear is therefore rather low and is usually limited to the groove flank. Its task is also to protect the ring belt from the direct effects of the combustion gases. However, a certain gas pressure must be maintained on the first ring, because this will press the ring against the cylinder surface.
Individual evidence
- ^ Franz Pischinger: Internal combustion engines , lecture reprint, Volume 1, self-published print, Aachen, October 1995, p. 233.