Patent ID: 6654676
Filing Date: 2003-11-25
Classification: B62D,Y10T

Abstract:
A steering system for a tracklaying vehicle wherein a pair of brakes are provided for right and left output shafts and the driving force of a hydraulic motor is transmitted to the right and left output shafts through differential steering means, the system comprising:(a) brake actuating means for independently actuating the right and left brakes; (b) driving force transmission interrupting means for interrupting a transmission of a driving force from the hydraulic motor to the differential steering means; (c) pivot turn control instruction signal detecting means for detecting an issue of a vehicle pivot turn control instruction signal; (d) vehicle speed detecting means for detecting the vehicle body speed of the vehicle; (e) controlling means for controlling the brake actuating means and the driving force transmission interrupting means in response to an output from the pivot turn control instruction signal detecting means such that after actuation of a brake for either one of the right and left output shafts by the brake actuating means and a transmission of a driving force from the hydraulic motor to the differential steering means are carried out concurrently for a specified period of time, the driving force transmission interrupting means interrupts the transmission of the driving force from the hydraulic motor to the differential steering means, wherein the controlling means controls an engine such that the vehicle body speed of the vehicle detected by the vehicle speed detecting means during a pivot turn of the vehicle becomes equal to a specified value.