Geared steering device for crawler vehicle and control unit ther

Details Geared steering device for crawler vehicle and control unit ther Geared steering device for crawler vehicle and control unit ther

1994-01-28

1996-09-24

Ta, Khoi Q.

Planetary gear transmission systems or components

Steering by driving

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

477 1, 477 35, 180 62, 180 944, B62D 1108

Patent

active

055585906

ABSTRACT:
A geared steering device (30) selectively operates rightside and leftside driving mechanisms (2,3) of a crawler vehicle (1) for more efficient operation of the crawler vehicle. The geared steering device (30) comprises a power input drive element (33) for inputting a driving power from a prime mover (7), rightside and leftside steering brakes (38R, 38L), rightside and leftside direct-coupled clutches (36, 44), a turn clutch (46), three arrays of planet gear trains (40, 43 and 48), and power output shafts (32R, 32L) coupled to right and leftside steering brake hubs (34R, 34L). A control unit compares an actual steering ratio of a geared steering device (30) with a designated steering ratio, outputs control signals to respective solenoid valves for controlling the direct-coupled clutches, the turn clutch or a steering brake so as to cause the actual steering ratio to approximate the designated steering ratio. The control unit outputs an engagement signal to the one of the direct-coupled clutches (36 and 44) on the side opposite to a steering direction entered by the steering lever (57).

REFERENCES:
patent: 4327603 (1982-05-01), Zaunberger et al.
patent: 4784232 (1988-11-01), Leboime
patent: 5195600 (1993-03-01), Dorgan

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