Vehicle drive device with a hydrostatic-mechanical power splitti

Details Vehicle drive device with a hydrostatic-mechanical power splitti Vehicle drive device with a hydrostatic-mechanical power splitti

1989-06-15

1990-12-11

Braun, Leslie A.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid pump and motor in one of plural paths to or from...

74720, F16H 4704

Patent

active

049766651

ABSTRACT:
In the case of hydromechanical power splitting transmission for vehicles the aim of the invention is to make possible the use of the same type of hydrostatic machine is hitherto and of an identical or similar four-shaft planetary differential transmission while at the same time expanding the effective range of conversion to cover substantially at least twice the range. This is achieved in that the hydromechanical power splitting transmission is designed for an extremely wide overdrive operation with a speed of rotation ratio (noutput: ninput of the two main shafts) of up to a maximum of 2. This is achieved by the addition of simple gear trains and the additional provision of clutches. Control devices are provided to so act on these additional clutches so that on transition from the second to at least one further operational range leading to the overdrive range, disengagement of one clutch disconnects the first hydrostatic machine (which has heretofore been connected with the annulus of the planetary differential transmission) and by engaging a further clutch at sync speed it is connected with one of the two main shafts of the power splitting differential transmission.

REFERENCES:
patent: 3884095 (1975-05-01), Miyao et al.
patent: 3897697 (1975-08-01), Chambers et al.
patent: 3969958 (1976-07-01), Miyao et al.
patent: 4242922 (1981-01-01), Baudoin
patent: 4313351 (1982-02-01), Hagin
patent: 4420991 (1983-12-01), Meyerle
patent: 4446756 (1984-05-01), Hagin et al.
patent: 4754664 (1988-07-01), Dick
patent: 4815334 (1989-03-01), Lexen
patent: 4843907 (1989-07-01), Hagin et al.

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