The name of helical gear is mainly different from spur gear. As the name suggests, it is "gear with inclined teeth". The tooth surface of this kind of gear is not parallel to the axial direction, but has a certain included angle. It is precisely because of this included angle that helical gear has a variety of characteristics different from spur gear.
Što se tiče poboljšanja performansi, spiralni zupčanik ima veći stepen koincidencije od cilindričnog zupčanika (povećava se sa povećanjem širine zupčanika i ugla spirale), što donosi jaču nosivost vozila i veći krajnji obrtni moment koji može biti opterećen. Stoga ima očigledne prednosti u oblasti velike-brzine i velikog opterećenja.
