Multi-rate side bearing for a railway truck
AssigneeAMSTED Industries Incorporated
InventorsHarry W. Mulcahy, Horst T. Kaufhold
Life of this patent
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Abstract
A multi-rate side bearing for a railway truck is provided. The side bearing comprises a base plate and an upper plate, with two resilient devices located between the base plate and the upper plate. The resilient devices usually are elastomeric pads of different compression rates and shear stiffness. Under unloaded car conditions, only one pad is in load supporting contact, but under loaded car conditions, both resilient devices contact the upper and base plates to provide load support and car body-truck motion damping.
Claims9
A railway truck comprising a truck bolster, a center plate opening in the truck bolster adapted to receive a center plate therein,
- two side bearing assemblies on the top surface of the truck bolster with one of said side bearing assemblies located on each side of the center plate opening,
- each side bearing assembly comprising a base plate affixed to the truck bolster and an upper plate, a first resilient device located between the base plate and the upper plate, and a second resilient device located between the base plate and the upper plate and outboard in relation to said center plate opening from the first resilient device, said first resilient device having a lower compression rate than the second resilient device, and said first resilient device having a lower shear rate than the second resilient device.
A side bearing for use in a railway truck, said side bearing comprising a base plate and an upper plate, a first resilient device located between the base plate and the upper plate, and a second resilient device located between the base plate and the upper plate and laterally outboard from the first resilient device, the first resilient device having a lower compression rate than the second resilient device, and the first resilient device having a lower shear rate than the second resilient device.
Dependencies are inferred from the claim text.