Overspeed control for a hydrostatic transmission

Details Overspeed control for a hydrostatic transmission Overspeed control for a hydrostatic transmission

1996-09-30

1998-05-05

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60449, F16D 3102

Patent

active

057460566

ABSTRACT:
An overspeed control for a hydrostatic transmission of a mobile machine includes a speed control valve arrangement connected to a fixed displacement pump through a supply line and to a pressure responsive displacement controller of a variable displacement hydraulic pump of the transmission. An overspeed control valve is connected to the supply line and is operative for reducing the fluid pressure level in the displacement controller when the speed control valve arrangement is in an operative position and the rotational speed of the engine exceeds a predetermined level. This reduces the displacement of the variable displacement pump (which acts as a motor in a downhill situation) and thus increasing engine retarding and transmission losses for preventing the positive grade from accelerating the machine, engine and/or the components of the hydrostatic transmission to speeds exceeding their designed limits.

REFERENCES:
patent: 3884039 (1975-05-01), Pourian
patent: 3964262 (1976-06-01), Patton
patent: 3987622 (1976-10-01), Johnson
patent: 4365473 (1982-12-01), Schexnayder et al.
patent: 4395878 (1983-08-01), Morita et al.
patent: 4802336 (1989-02-01), Mayr et al.
patent: 5447029 (1995-09-01), Swick et al.

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