Filter for hydrostatic transmission

Details Filter for hydrostatic transmission Filter for hydrostatic transmission

2005-04-19

2005-04-19

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

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

C060S454000, C060S487000

Reexamination Certificate

active

06880334

ABSTRACT:
In a hydrostatic transmission or integrated hydrostatic transaxle having a housing forming an oil sump and a hydraulic pump and hydraulic motor mounted in the sump and connected through hydraulic porting, a filter housing or other structure defining an internal volume is mounted adjacent to the check valves for the hydraulic porting. Oil passing into this internal volume is filtered to prevent the introduction of contaminants into the hydraulic porting. A himney is formed as part of the filter housing and extends upwards therefrom, and is open to the internal volume. The chimney also includes an opening to permit air to escape to the oil sump, to reduce the risk of air being introduced into the hydraulic porting through the check valves.

REFERENCES:
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patent: 4995971 (1991-02-01), Droste et al.
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patent: 6185936 (2001-02-01), Hauser et al.
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