Power plants – Pressure fluid source and motor – Having distinct cooling or lubricating structure
Patent
1998-08-06
2000-06-13
Nguyen, Hoang
Power plants
Pressure fluid source and motor
Having distinct cooling or lubricating structure
60487, 60488, F16D 3102, F16D 3900
Patent
active
060734434
ABSTRACT:
A hydrostatic transmission (HST) including a hydraulic pump is contained in a housing having upper and lower housings. An input shaft of the hydraulic pump projects outward from the upper housing. A cooling fan is provided on an upper end of the input shaft. A conduit is disposed within an area between the fan and the upper housing. The conduit extends between first and second couplings and is in communication with an oil sump formed in the housing. A pumping device, which rotates with the input shaft, is disposed within the second coupling for forcedly circulating oil between the conduit and the sump. Alternatively, a reservoir is disposed on an outer wall of the housing forming a second oil sump. A level of oil in the second oil sump is lower than a level of oil in the oil sump formed in the housing. The second oil sump communicates with the atmosphere whereas the oil sump formed in the housing is separated from the atmosphere. A siphon communicates both sumps with each other. The driving apparatus may incorporate either the conduit, the reservoir, or both the conduit and the reservoir.
REFERENCES:
patent: 3654761 (1972-04-01), Eickmann
patent: 5394699 (1995-03-01), Matsufuji
patent: 5515747 (1996-05-01), Okada et al.
patent: 5622051 (1997-04-01), Iida et al.
patent: 5802851 (1998-09-01), Krantz
Ishii Norihiro
Okada Hideaki
Kanzaki Kokyukoki Mfg. Co. Ltd.
Nguyen Hoang
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