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The Danaus-Runflat™
Engineered metal runflat tire-space insert with built-in air-shock crown
Copyright© 2014 LLC, 2014. All rights reserved.
Two ProblemsTire puncture or rupture by bulletsor spikes or sharp rocks and such results in complete decompression.The tire then must run on flat, whichmay damage the rim and the vehicle and can cost lives due to instable ride.Runflat inserts alleviates this problem.
Driving on sand and similar soft soil,off-road vehicles require increased contact surface for better traction. The tire is then partially decompressed. Without bead-lock, such tires may roll off the rim, causing further damage and danger. Reinforced rubber and plastic runflat inserts work against the purpose.
Rim well fillers, well-less rims and bead locks
These prevent tire loss, allowing to drive on the rim with further tire damage and borrow time to move on for short while.
Driving on sand solutions
Thread footprint doubles but sets limitation on a rigid runflat insert.Partially deflated tire has greatly reduced boulder impact resistance.Engineered runflat is needed with large deflection (stroke) capacity.
Engineered runflat solution
Radially flexible, laterally rigid steel/alloy/composite runflat insert. When its running surface is Teflon coated, the tire need no lubricant.
Built-in air-cylinders
Lightweight adjustable pressure aluminum or steel assembly.For rims with well, the shock crown is mounted on inner drum.
Main advantages
• It can go hundreds of miles with flat tire• It can take multiple gunshots unharmed• It can isolate the blast of roadside bombs• It has exceptional stability on sand/soft-soil • It has high boulder/ditch impact resistance• It has adjustable progressive/linear stiffness• It boosts the sprung-unsprung mass ratio• It can save fuel by harmonic pressure control• It stabilizes ride by centering the load support
Special features
The shock-crown is a large twist angle torque limiting flexible torque coupler, which prevents
• drivetrain overload,
• digging in sand, mud, snow and soft soil,
• slipping on snow, ice and slick pavement,
• excessive drivetrain wear,
• loss of bearing capacity, and
allows for stiffness control by shock-pressurizing.
Disadvantages
• It costs more than a solid rubber insert
• It has moving parts with pistons and seals