Geared steering device for crawler vehicle and control system th

Details Geared steering device for crawler vehicle and control system th Geared steering device for crawler vehicle and control system th

1994-06-27

1996-10-29

Ta, Khoi Q.

Planetary gear transmission systems or components

Steering by driving

With plural power paths to a planetary transmission at each...

475 31, 477 1, 180 62, B62D 1106, B62D 1102, B62D 600

Patent

active

055691099

ABSTRACT:
A geared steering system, which is capable of actuating rightside and leftside driving mechanisms to ensure efficient operation of a crawler vehicle, has a geared steering device (30) and a control system. The geared steering device (30) has one power input shaft (31), leftside and rightside steering brakes (38L, 38R) and leftside and rightside direct-coupled clutches (36, 44), one turn clutch (46), three planet gear trains (40, 43, 48), leftside and rightside power output shafts (32L, 32R) coupled to leftside and rightside steering brake hubs (34L, 34R), and a hydraulic turning motor (83) coupled to the turn clutch (46) with gears. The control system has a controller (56) which compares an actual steering ratio of the geared steering device (30) and a designated steering ratio, and outputs a correction signal for approximating the actual steering ratio to the designated steering ratio to solenoid valves (60-64) for controlling the leftside and rightside direct-coupled clutches (36, 44), the turn clutch (46) or the leftside and rightside steering brakes (38L, 38R), an engaging signal to a direct-coupled clutch for an opposite direction to the steering direction to be entered by an operation lever (57), and, in a low speed large radius turn, a signal for controlling an amount of discharge of a variable capacity hydraulic pump (87).

REFERENCES:
patent: 3405574 (1968-10-01), Livezey
patent: 4327603 (1982-05-01), Zaunberger et al.
patent: 4434680 (1984-03-01), Riediger et al.
patent: 5325933 (1994-07-01), Matsushita

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