Pressure regulating hydraulic circuit and valve

Details Pressure regulating hydraulic circuit and valve Pressure regulating hydraulic circuit and valve

F - Mech Eng,Light,Heat,Weapons

16

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138/79.11

F16D 31/00 (2006.01) F16D 48/02 (2006.01) F16D 48/04 (2006.01)

Patent

CA 1133796

Pressure Regulating Hydraulic Circuit and Valve Abstract For work vehicles, for example, cold weather can be a problem. Disengaging the vehicle clutch aids starting by reducing engine loads during starting. Where the clutch is hydraulically actuated, it can be disengaged by keeping fluid pressures below required engagement pressure when supplying other elements common to the clutch hydraulic circuit. Apparatus is provided which during starting directs fluid to, for example, pump drive bearings at less than clutch engagement pressure. An input signal to the apparatus from the vehicle operator after engine start-up then builds pressure to activate the clutch while continuing to supply the pump drive bearings for lubrication. Upon a preselected fluid flow to the apparatus, such as at engine shutdown, the apparatus automatically returns to the condition at which available pressure levels are less than required for clutch engagement. Thus, cold starting problems are substantially eliminated by auto- matically providing a clutch disengaged situation in the vehicle during engine start-up.

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