Through calculating the changes of pressure angle of quasi transverse double circular-arc gear and normal plane double circular-arc gear in different error of center distances

conclusion of that quasi transverse double circular-arc gear is superior in overcoming centre distance error sensitiveness is obtained.And finally the regular pattern of quasi transverse double circular-arc gear engaging under centre distance error is found

by analysis the gear with different helix angles β hobbed by a hob with different helix angles β0.And this is definitely meaningful to the design and manufacture of quasi transverse double circular-arc gear

and so its promotion.