Machine element or mechanism – Gearing – With fluid drive
Patent
1981-09-10
1984-11-06
Herrmann, Allan D.
Machine element or mechanism
Gearing
With fluid drive
74730, 74664, 180243, F16H 4700, F16H 3706
Patent
active
044805020
ABSTRACT:
A hydrostatic-mechanical multiple-wheel drive for heavy vehicles with a multi-gear transmission for driving main driving wheels and hydrostatically operated additional driving wheels to be connected, as required, by themselves or when in one of the lower gears, including a variable displacement pump, driven directly proportionally to the speed of the main drive motor, for acting upon the additional driving wheels and an auxiliary pump acting as a filling and control pump, wherein, in order to control the speed with which the additional driving wheels are driven to that of the vehicle wheels, in particular to achieve synchronous running of these wheels, provision is made for orifices and/or throttles in the oil circuit of the auxiliary pump for varying the control pressure for the adjusting cylinder of the variable displacement pump so as to adjust these against the restoring force of the pump and of springs in the adjusting cylinder to the control pressure corresponding to the desired speed.
REFERENCES:
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patent: 3354977 (1967-11-01), Swift
patent: 3361223 (1968-01-01), Bauer
patent: 3415334 (1968-12-01), Vriend
patent: 3430722 (1969-03-01), Budzich
patent: 3736732 (1973-06-01), Jennings et al.
patent: 4020917 (1977-05-01), Lutterschmidt
patent: 4183419 (1980-01-01), Henn et al.
patent: 4244184 (1981-01-01), Baldauf et al.
patent: 4341133 (1982-07-01), Sakamoto
Herrmann Allan D.
Wojciechowski Bruce F.
Zahnradfabrik Friedrichshafen Aktiengesellschaft
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