Patent ID: 6216806
Filing Date: 2001-04-17
Classification: B60T,B62D

Abstract:
A supplemental steering system for a machine, comprising:a first brake;a second brake;a brake actuator including a reservoir of brake fluid connected in fluid communication with a first port and a second port of a supplemental steering control valve, the supplemental steering control valve including a valve body defining a bore divided into a first chamber and a second chamber, the first port communicating with the first chamber and the second port communicating with the second chamber, a piston located in the bore, the piston being connected to a steering input and having a neutral position generally equidistant between the first and second chambers, the supplemental steering control valve including a first brake port communicating the first chamber with the first brake and a second brake port communicating the second chamber with the second brake;wherein the piston is movable by the steering input in a first direction a predetermined distance into the first chamber to close the first port such that further movement of the piston in the first direction will urge brake fluid in the first chamber through the first brake port to actuate the first brake, and wherein the piston is movable by the steering input in a second direction a predetermined distance into the second chamber to close the second port such that further movement into the second chamber will urge brake fluid contained therein through the second brake port to actuate the second brake.