US12570334USUSPTO Grant XML

Multi-unit railroad car and railroad car trucks therefor

A symmetrical multi-unit railroad freight car, such as a 3-pack railroad intermodal well car, has body units that are connected symmetrically. The body units have a symmetrical arrangement of end trucks and shared trucks. The end trucks are 70 Ton Trucks. The shared trucks are 125 Ton trucks. The trucks have passive steering using geometric rocker stiffnesses. The rockers in the end trucks have a smaller radius of curvature than the rockers in the shared trucks. The spring groups in the shared trucks are stiffer than the spring groups in the end trucks. The spring groups in the end trucks have a different proportion of damping when empty, a shorter live load range of travel, and greater reserve travel than the shared trucks. The end trucks and the shared trucks have four-cornered damper groups that have the same sized damper wedges. The damper wedges have non-metallic wear pads.

Patent

Brief

Patent brief

Problem

How can vibration in electric motors and rotors be reduced?

Novelty

The body units have a symmetrical arrangement of end trucks and shared trucks.

Uses

Motor mounts, Equipment isolation, Compact machinery

Assignee

National Steel Car Limited

Published

Mar 10, 2026

Inventors

Jamal Hematian, Zijian Yan

Domain

Electromechanical systems

Plain-English summary

Problem

How can vibration in electric motors and rotors be reduced?

Solution

symmetrical multi-unit railroad freight car, such as a 3-pack railroad intermodal well car, has body units that are connected symmetrically.

Key novelty

The body units have a symmetrical arrangement of end trucks and shared trucks.

Applications

Motor mountsEquipment isolationCompact machinery

Relevant search intents

dampingdamper

Claims preview

1 . A multi-unit articulated railroad freight car comprising: a set of articulated car body units, said set of articulated car body units being carried upon a symmetrical arrangement of three-piece railroad car trucks; said set of articulated car body units including first, second and third car body units, said first car body unit being a first end unit of said multi-unit articulated railroad freight car; said second car body unit being an intermediate unit of said freight car; said third body unit being a second end unit of said freight car; said first car body unit having a first end and a second end; said first end of said first car body unit being connected to said second car body unit at a first shared truck; said second end of said first car body unit being distant from said first shared truck; and said second end of said first car body unit having a coupler operable to connect said multi-unit articulated railroad freight car to another freight car; said second end of said first car body unit being carried on a first end truck; said first shared truck having first and second spring groups; said first shared truck having first and second four-cornered damper groups; said first shared truck having rolling point contact rockers mounted at respective side frame to bearing adapter interfaces operable to permit said first shared truck to self-steer; said first end truck having first and second spring groups; said first end truck having first and second four-cornered damper groups; said first end truck having rolling point contact rockers mounted at respective side frame to bearing adapter interfaces operable to permit said first end truck to self-steer; said rolling point contact rockers of said shared truck having a first radius of curvature; said rolling point contact rockers of said end truck having a second radius of curvature; and said first radius of curvature being larger than said second radius of curvature. 2 . The multi-unit articulated railroad freight car of claim 1 wherein: said multi-unit articulated railroad freight car is a three-unit articulated railroad freight car; said symmetrical arrangement of three-piece trucks including said first end truck, said first shared truck, a second shared truck, and a second end truck; said second end unit being connected to said intermediate car body unit; said second shared truck being located between said intermediate car body unit and said second end unit; said second end truck being located under said second end unit at a location distant from said second shared truck; said second shared truck being the same as said first shared truck; and said second end truck being the same as said first end truck. 3 . The multi-unit articulated railroad freight car of claim 1 wherein said multi-unit articulated railroad freight car is an intermodal well car.

Linked approaches

Damping mounts

Isolation and damping structures that absorb motor vibration.

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