Patent ID: 6920828
Filing Date: 2005-07-26
Classification: B61D,B61F

Abstract:
1. A three piece rail road car truck having: a pair of first and second side frames and wheelsets mounted therebetween; a truck bolster mounted transversely relative to the sideframes, the truck bolster having a first end and a second end; a first spring group mounted between said first end of said truck bolster and said first side frame; a second spring group mounted between said second end of said truck bolster and said second side frame; said first spring group having a total spring rate stiffness; a first set of spring loaded dampers mounted between said first end of said truck bolster and said first side frame; a second set of spring loaded dampers mounted between said second end of said truck bolster and said second side frame; said first and second sets of dampers being driven by springs; said first set of dampers including a first damper and a second damper, said first and second dampers being independently sprung; said first damper being located laterally more inboard than said second damper; and said first set of dampers being driven by springs having a combined spring rate stiffness of more than 3200 Lbs/inch, and said combined spring rate of said springs driving said first set of dampers being substantially greater than 15% of said total spring rate stiffness.