Squealer band design for steel shell brake drums

A brake drum comprising a roll-formed, steel shell that is axisymmetric about an axis of rotation, the steel shell having an open end of the steel shell and a second end of the steel shell, the second end of the steel shell being axially opposite the open end of the steel shell, the steel shell further comprising:

• a first integrated squealer band, the first integrated squealer band being a first raised portion of the steel shell that extends radially outward between the open end of the steel shell and the second end of the steel shell and continuously in a circumferential direction about the steel shell, the first raised portion of the steel shell having a concave section whose center of curvature is radially farther from the axis of rotation than the concave section;
• and
• a second integrated squealer band, the second integrated squealer band being a second raised portion of the steel shell that extends radially outward between the open end of the steel shell and the second end of the steel shell and continuously in the circumferential direction about the steel shell, the second raised portion of the steel shell having a convex section whose center of curvature is radially closer to the axis of rotation than the convex section.

A brake drum comprising a roll-formed, steel shell that is axisymmetric about an axis of rotation, the steel shell having an open end of the steel shell and a second end of the steel shell, the second end of the steel shell being axially opposite the open end of the steel shell, the steel shell further comprising:

• a first integrated squealer band, the first integrated squealer band being a first raised portion of the steel shell that extends radially outward between the open end of the steel shell and the second end of the steel shell and continuously in a circumferential direction about the steel shell, the first raised portion of the steel shell having a section that is radially flat;
• and
• a second integrated squealer band, the second integrated squealer band being a second raised portion of the steel shell that extends radially outward between the open end of the steel shell and the second end of the steel shell and continuously in the circumferential direction about the steel shell, the second raised portion of the steel shell having a section that is radially flat.