Hydrostatic transmission having an overspeed control

Details Hydrostatic transmission having an overspeed control Hydrostatic transmission having an overspeed control

F - Mech Eng,Light,Heat,Weapons

16

H

138/41.1

F16H 39/02 (2006.01)

Patent

CA 1151505

Hydrostatic Transmission Having an Overspeed Control Abstract An underspeed actuator is connected to the displacement control for controlling the dis- placement of a variable displacement pump of a hydrostatic transmission in response to the pressure differential between low and high pressure control signals wherein the pressure differential is directly proportional to the engine speed. An overspeed control valve means is connected to the low and high pressure signals and decreases the pressure level of the high pressure signal received by the underspeed actuator in response to the pressure differential exceeding a predetermined magnitude. This reduces the displacement of the variable displacement pump thereby controlling the amount of engine overspeed caused by the hydrostatic transmission driving the engine when the vehicle is descending a steep hill.

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