Machine element or mechanism – Gearing – With fluid drive
Patent
1979-05-10
1982-01-19
Braun, Leslie
Machine element or mechanism
Gearing
With fluid drive
74655, 74730, 74731, 192 322, 192 4A, 192 4C, F16H 4706, F16D 3306
Patent
active
043110681
ABSTRACT:
A multi functioning hydraulic transmission control circuit including interacting valve mechanism parts which, in response to a shift being called for in a clutch-cylinder-controlled multi-speed transmission, inaugurate a fill pressure flow to the clutch cylinders concerned, prior to the subsequent fluid pressure rise effected therein; thereafter, upon completion of the fill, the parts modulate pressure rise of the hydraulic clutch fluid from and at approximately actual clutch fill pressure up to, and remaining at, the final pressure of engagement.
These functions including full resetting of the parts at the beginning of each shift, and a lesser and a least gradual pressure rise afforded during shifts into respective second and third speed drive ratios, are all accomplished by and among a pair of direction-selector and orificed-speed-selector valve spools connected to the transmission clutch cylinders to direct valve fluid output thereto selectively, and also 1st, dump valve, 2nd, simulated clutch piston, 3rd, load piston, 4th, modulator valve, and 5th, interacting spring parts collectively providing said directed valve fluid output, all in a valve bore common thereto, and arranged therein with the dump valve part confronted at one side by the simulated clutch piston part so as to define mutually therewith a differential pressure chamber in the bore, and confronted at the other side by a first side of the load piston part so as to define mutually with that first side a signal pressure chamber in the bore, and with an opposite side of the load piston part spacedly confronting the modulator valve part so that they mutually engage therebetween the interacting spring parts in the common bore.
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AuBuchon F. David
Braun Leslie
Gaines John W.
International Harvester Company
Kamp Ronald C.
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