Height adjustable secondary suspension for a rail vehicle
US10442448B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2017 |
| Grant date | Oct 15, 2019 |
| Priority date | — |
| Expiry date | Dec 9, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB61F5/22
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A secondary suspension system for a railcar comprises a chassis, a primary spring, a levelling actuator, a first hydraulic circuit and a secondary spring. The levelling actuator is adapted to be connected to the carbody. A piston shoulder, located at the lower portion of the piston and below an opening in the chassis, reaches farther than the opening so as to be capable of catching the chassis. The secondary spring is at least partially positioned underneath the piston shoulder. The piston is operative to adopt a high position inside the body under a pressure of a hydraulic fluid injected in a lower chamber below a piston head. This makes the piston shoulder abut against the chassis, thereby compressing the primary spring between the body and the chassis without compressing the secondary suspension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.