Non vibration tread angle for rubber track

An endless elastomeric drive track being disposed about a plurality of wheels, said drive track comprising:

• an endless belt having an outer surface and an inner surface;
• said endless belt having a longitudinal axis;
• said endless belt having at least one endless wheel contact area substantially parallel to said longitudinal axis;
• said endless wheel contact area having a longitudinal axis substantially parallel to said longitudinal axis of said endless belt;
• said endless wheel contact area having a lateral axis substantially perpendicular to said longitudinal axis of said endless wheel contact area;
• said wheel contact area having a width (B) substantially equal to the width of one of said plurality of wheels;
• a plurality of spaced lugs extending from said outer surface of said endless belt;
• each of said lugs disposed at a tread angle (a) with respect to said lateral axis of said endless wheel contact area;
• each of said lugs having a tread pitch (P);
• said wheel contact area having a maximum contact length and a minimum contact length with respect to the lugs when engaging one of the plurality of wheels;
• and
• said contact length being substantially constant along said tread pitch.

An endless elastomeric drive track being disposed about a plurality of wheels, said drive track comprising:

• a main body portion having a longitudinal axis, an inner surface, and a substantially planar outer surface;
• a plurality of longitudinally-spaced external lugs projecting outwardly from said outer surface of said main body;
• each of said lugs having first and second portions, said first and second portions spaced from each other across said longitudinal axis and being substantial mirror images of each other about said longitudinal axis;
• each of said portions having a first leg and a second leg;
• said first leg of said first portion being spaced from said first leg of said second portion by a gap;
• said first leg being substantially perpendicularly disposed with respect to said longitudinal axis;
• said second leg extending rearwardly from said first leg at a tread angle (a);
• and
• wherein said inner surface of said main body has a pair of wheel contact areas aligned with said second legs;
• each of said wheel contact areas having a width (B);
• each of said second legs having a tread pitch (P) in said wheel contact area;
• wherein said tread pitch (P), said tread angle (a), and said wheel contact area width (B) are related by a tread-wheel non-vibration formula of P=B*tan(a).