Duane S Robinson

US Patent:

49985922, Mar 12, 1991

Filed:

Jun 12, 1990

Appl. No.:

7/536818

Inventors:

Edward E. Londt - Fort Wayne IN
Duane S. Robinson - New Haven IN

Assignee:

Navistar International Transportation Corp. - Chicago IL

International Classification:

B62D 3310

US Classification:

180 8912

Abstract:

A passive mechanical damping system, particularly for the suspension of a cab from a truck frame, provides a minimal level of damping force to impede the free movement of a truck cab about its nominal height and also provides higher levels, progressively or in discrete steps, of damping as the movement of the cab exceeds preset limits of displacement defined by a lost motion connection to provide maximum vibration isolation while providing additional damping to control cab movement when the preset displacement limits are exceeded. The system provides a low rate viscous damper continuously connected between the cab and the truck frame and a high rate viscous damper connected therebetween through a lost motion connection.