Hollow cylindrical valve guide, has cylindrical external casing section with axial length of about zero to one-third of axial length of recessed external casing section, where recessed external casing section widens away like truncated cone

摘要

The guide (9) has a radially recessed external casing section widening away from an axial end like a truncated cone. A cylindrical external casing section is attached at the axial end of the recessed external casing section, where the axial end of the recessed external casing section has a large diameter. The cylindrical external casing section passes into the recessed external casing section to form an undercut. The cylindrical external casing section has an axial length of about zero to one-third of the axial length of the recessed external casing section.