Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1990-02-14
1991-02-26
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
60491, 475 24, 475 74, 74469, 74479, G16H 2702, G05G 1100, G05G 1300
Patent
active
049952765
ABSTRACT:
A drive system includes a vehicle propulsion drive having a speed change gear box which drives tracks through a pair of planetary gears and a steering drive having a pair of variable hydrostatic drives. The hydrostatic drives engage a neutral shaft which superimposes rotation on the planetary gears to provide steering control for the tracks. The neutral shaft is separable into two segments. A differental reversing gear may be employed to selectively couple the neutral shaft segments. When the vehicle travels at high speed, the neutral shaft segments are coupled for unitary rotation. At low vehicle speeds, the propulsion drive is blocked and the neutral shaft segments are uncoupled so that both propulsion and steering are provided through the hydrostatic drives. For combined steering control and regulation of slow travel speeds as a function of the requirements of specific operating equipment carried by the vehicle, a control apparatus operates as a function of electrical signals for regulating travel speed and provides, through a linkage, adjustment of the hydrostatic unit controls and, in addition, superimposes upon the adjustment, modification required for steering the vehicle.
REFERENCES:
patent: 2682859 (1954-07-01), Jensen et al.
patent: 4290344 (1981-09-01), Adams
Herrmann Allan D.
Levi Benjamin
Renk Aktiengesellschaft
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