Power plants – Pressure fluid source and motor – With means purging – cleaning or separating undesirables from...
Patent
1991-07-22
1994-12-20
Look, Edward K.
Power plants
Pressure fluid source and motor
With means purging, cleaning or separating undesirables from...
60489, 60494, F16D 3102
Patent
active
053736974
ABSTRACT:
A hydrostatic transaxle having a hydrostatic transmission includes a plate-like dump valve disposed between the transaxle housing or in a recess formed therein, adjacent a fluid conduit that connects the pump and motor of the transmission, the dump valve having fingers which unseat valves in the conduit to relief pressure therein. A rod having an offset portion extends through a bore in the dump valve, the rotation of the rod and offset portion urges the fingers of the plate-like dump valve towards or away from the conduit valves. The settling chamber disposed within the transmission includes protrusions upwardly projecting from the bottom of the chamber which trap particulates suspended in the hydraulic fluid that circulate through the system. A magnet is likewise disposed in the settling chamber adjacent the protrusions for attracting and holding magnetic particles and debris circulated by the hydraulic fluid. A double lip, W-shaped seal is radially provided on the output shaft connecting the transmission motor located in the transmission chamber with the gearing located in the gearing chamber that prevents hydraulic fluid and particulates from the gearing chamber to mix with the hydraulic fluid from the transmission chamber.
REFERENCES:
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patent: 3875654 (1975-04-01), Ushijima
patent: 4348864 (1982-09-01), Ichimura et al.
patent: 4899541 (1990-02-01), Okada et al.
patent: 4979583 (1990-12-01), Thoma et al.
patent: 4986073 (1991-01-01), Okada
patent: 5010733 (1991-04-01), Johnson
patent: 5090949 (1992-02-01), Thoma et al.
Jolliff Norman E.
Weirich Michael P.
Look Edward K.
Lopez F. Daniel
Tecumseh Products Company
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