Motor vehicles – Steering by driving – Auxiliary steering motor
Patent
1980-01-17
1981-07-28
Silverstrim, John P.
Motor vehicles
Steering by driving
Auxiliary steering motor
180 67, 60449, B62D 1110
Patent
active
042805791
ABSTRACT:
A tracked vehicle includes an engine driven transmission having a pair of output shafts, each of which engages a planetary gear set for driving chain treads. An infinitely variable, hydrostatic/hydrodynamic, superimposed steering mechanism includes a neutral shaft in engagement with the sun gears of each of the planetary gear sets. The steering mechanism includes a hydrostatic drive unit with a regulating pump having a control lever operatively connected to the vehicle steering wheel and an oil motor having an absorption regulating lever. The steering mechanism also includes a hydrodynamic drive unit which is controlled as a function of the hydrostatic system pressure. Output gears of both steering drive units engage the neutral shaft. A torque control valve includes a plunger which positions the oil motor absorption lever as a function of the hydrodynamic drive speed to increase torque at low drive speeds and reduce torque at high drive speeds. The speed dependent position of the control valve plunger is overridden in the presence of high pressures in the hydrostatic drive unit to increase torque when necessary at high speeds.
REFERENCES:
patent: 3371734 (1968-03-01), Zaunberger
patent: 3392602 (1968-07-01), Frost
Kugler Artur
Zaunberger Franz X.
Silverstrim John P.
Zahnraderfabrik Renk Aktiengesellschaft
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