Static water pressure loop pressure regulation valve with reduced input torsion required by static water pressure element

Abstract

A hydrostatic loop dump valve for reducing the starting torque required for a hydrostatic unit includes a normally biased open dump valve connecting one or more of the system pressure lines to the reservoir. The dump valve(s) will automatically open and oil will drain out by gravity when the engine is not running. When the engine turns the hydrostatic unit at sufficient speeds to generate significant charge pressure, the dump valves will close and the unit will operate as normal. Thus, the input torque required to start the engine and the hydrostatic unit is minimized without damaging the hydrostatic unit.

Description

technical field [0001] The invention relates to the field of hydraulic transmission devices. More particularly, the present invention relates to a hydrostatic loop regulator that reduces the input torque required by the hydrostatic elements, particularly during cold oil starts. The use of closed loop or closed loop hydrostatic pressure transfer to propel tractors or other vehicles is known. Traditionally, the variable hydrostatic transmission device or element may be driven directly by the tractor's engine. During engine starting conditions in colder weather, the torque required to turn the hydrostatic element is much greater than during engine starting in warmer weather, especially during the stroke. The additional torque load from the hydrostatic elements can overload the engine starting system, making starting difficult or impossible in cold weather. Background technique [0002] If the hydrostatic variable element is set at 0 movement (ie neutral position), then the s...

AI Technical Summary

Problems solved by technology

However, the manufacturer of the original equipment of the vehicle cannot guarantee that before starting the engine, intermediate conditions can be achieved

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