Patent ID: 7712420
Filing Date: 2010-05-11
Classification: B61C

Abstract:
1. A cab isolation system for a locomotive including a cab having a front and a rear, an underframe, and a short hood engaging the front of the cab and situated on the underframe, said cab isolation system comprising: at least one pivot operatively engaging the rear of the cab to the underframe, said pivot selected to control the frequency and magnitude of vertical, lateral and longitudinal natural frequencies near the rear of the cab, and at least one spring operatively engaging the front of the cab to the underframe via a least a portion of the short hood, wherein said spring engages the portion of the short hood above the longitudinal plane of the engagement of the pivot and the underframe, wherein a cab pitch natural frequency is established by the spring between the cab and the short hood, said spring selected to maintain a lower cab pitch natural frequency relative to the underframe first bending natural frequency, wherein the pivot and spring are situated to isolate the cab from the first bending natural frequency of the underframe.