Motor vehicle hydrostatic transmission having an internal oil ex

Details Motor vehicle hydrostatic transmission having an internal oil ex Motor vehicle hydrostatic transmission having an internal oil ex

1996-06-13

1998-01-20

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

With means purging, cleaning or separating undesirables from...

60464, 60487, F16D 3102

Patent

active

057090840

ABSTRACT:
Motor vehicle hydrostatic transmission having an internal oil expansion chamber including a main housing having at least one opening, this main housing including a sump pump oil reservoir having a predetermined volume of sump pump oil and an input cover sealingly attached to an opening in the main housing, this input cover having an internal oil expansion reservoir which captures or traps a specified volume of air above the sump pump oil level. Thus, when the oil level rises due to elevated operating temperatures, this captured or trapped air volume is decreased resulting in an increase in both the captured or trapped air pressure and the sump pump oil pressure. This causes an increase in the hydrostatic transmission's operating efficiency since the sump pump oil pressure acts as a charge pump to supercharge the low pressure inlet of the closed loop hydraulic system. In addition, the hydrostatic transmission bearing performance will increase since they are designed to operate under pressure.

REFERENCES:
patent: 4903545 (1990-02-01), Louis et al.
patent: 4987796 (1991-01-01), von Kaler et al.
patent: 5234321 (1993-08-01), Gafrert
patent: 5259194 (1993-11-01), Okada
patent: 5289738 (1994-03-01), Szulczewski
patent: 5394699 (1995-03-01), Matsufuji
patent: 5440951 (1995-08-01), Okada et al.
patent: 5505279 (1996-04-01), Louis et al.
patent: 5593000 (1997-01-01), Johnson

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