Hydraulic fluid system and dump valve mechanism for a hydrostati

Power plants – Pressure fluid source and motor – With means purging – cleaning or separating undesirables from...

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Details

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:
patent: 1948022 (1934-02-01), Carpenter
patent: 3199297 (1965-08-01), Croswhite
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.

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